Technical field
[0001]
The present invention, roller journal protector to protect the roller journal that is provided on grinder pulverized by grinding solid was initially a carbon-containing solid fuel such as coal, pulverized roller unit and this with the roller journal protector milling machine having a grinding roller unit, and relates to a maintenance method of the roller journal protector.
BACKGROUND
[0002]
Conventionally, using a pulverizer (mill), coal etc. pulverized coal combustion apparatus of the thermal power boiler of the pulverized coal pulverized to fine powder with fuel a carbon-containing solid fuel is known. Such mills are fines for blowing raw coal sent from coal feeder, crushed by pressing by the grinding rollers and the grinding table (producing pulverized coal), the gap between the grinding table and the casing (housing) carrier gas used for transporting charcoal using flow (air or inert gas) to be conveyed to the boiler side through the fuel supply pipe from the grinder (see Patent documents 1 and 2).
[0003]
　Within such a grinder, fine powder of the pulverized coal and the like can be blown on stream of carrier gas (air or inert gas). Patent Document 1, blown up was fine powder, a technique aimed at the hole portion so as not to leak out the casing (housing) that grinding roller penetrates is described. Patent Document 2, technology that aims to pulverized coal blown up, not to be clogged between the labyrinth seal for closing shaft holding portion of the grinding roller is described.
CITATION
Patent Document
[0004]
Patent Document 1: JP 2002-224581 Patent Publication
Patent Document 2: JP 2011-92849 JP
Summary of the Invention
Problems that the Invention is to Solve
[0005]
　However, because some of the fine powder blown up on stream of the carrier gas, which impinges on a portion of the roller and the journal of the roller support portion or the like for supporting the shaft-like portion and the grinding roller grinding rollers (roller journal), wear protection of these places has become an issue.
[0006]
　In contrast, it is possible to affixed a plurality of wear-resistant steel sheet directly matrix at positions wear surface of the base material occurs, take measures for suppressing abrasion. However, during this case, the task of replacing a plurality of wear-resistant steel sheet worn, since Harikaeru abrasion resistance steel plate so as not to damage the base material by hand, poor workability, re crusher takes time to operate, have the potential to reduce significantly the rate of operation of the grinder, also peeled off part of the base material surface together when peeled off the steel sheet, there is a fear that damage the base material.
[0007]
　The present invention has been made in view of such problems, with and prevent collision fine powder to the roller journal to suppress the wear occurs, good workability on the maintenance of the roller journals, the base material it Contact damaging the also to be able to be reduced, the roller journal protector, grinding roller unit and grinder, as well, and to provide a maintenance method of the roller journal protector.
Means for Solving the Problems
[0008]
　(1) To achieve the above object, the roller journal protector of the present invention is disposed in an opening formed in the peripheral wall of the housing of the grinder, which is swingably supported on the peripheral wall by the swinging axis and journal head, the roller support portion of the journal head mounted via a roller journal portion having a shaft-like portion in the solid was rotated together in contact with the upper surface of the grinding table rotating in the housing to fine powder and a grinding roller having a roller body unit for grinding, downward in the vertical direction of the shaft-like portion, the carrier gas outlet for blowing out the carrier gas upward is disposed, it is equipped to the grinding roller unit, the roller a journal portion, a protector to protect against collisions of the fine powder to be transported together with the carrier gas, is attached to the journal head A mounting panel member, formed on the semi-frustum shape which surrounds the vertically lower portion of the shaft-like portion, and a base end portion is fixed to the mounting panel member, tip toward the roller body portion extends, is characterized by having a shield to protect against collisions of the fine powder to cover the portion where carrier gas strikes from the carrier gas outlet.
[0009]
　(2) vertically below the area of the semi-frustoconical in mounted state of the shield, formed from the proximal end to descend inclined from the horizontal plane at an angle of more than the angle of repose of the fine powder toward the tip it is preferable to have been.
　(3) The shield is preferably a plurality of flat plates are joined is formed on the semi-frustum shape.
　(4) to the carrier gas strikes the side surface from the carrier gas outlet of the shield is preferably rigid tile to protect the shield from the collision of the fine powder is attached.
[0010]
　(5) the mounting panel member, the rollers in the vertical direction below the support portion is disposed so as to cover a portion of the opening, impinging at least a portion of the roller journal and the pivot axis of the fine powder It is protected from is preferred.
[0011]
　(6) The mounting panel member is semi-circular is disposed along the lower half periphery while being formed in accordance with the lower half of the outer peripheral shape of the to parts to be vertically above the mounting state roller support portion shape with a concave edge portion, said proximal portion of said shield is secured in proximity to the concave edge portion, the carrier gas from the carrier gas outlet located vertically below the shield attachment state strikes on the surface side, it is preferable that the hard tile to protect the mounting panel member from the impact of the fine powder is attached.
[0012]
　(7) the mounting panel member, and side regions from each side of the lower half periphery of the roller support portion extending in the width direction and vertically below the opening in the mounted state, the roller support in a mounted state and a lower region which extends vertically below the lower half of the outer peripheral parts, the hard tile is preferably mounted to at least a portion of the lower region.
[0013]
　(8) wherein the mounting panel said carrier gas transporting the gas strikes the side surface of the air outlet member mounting seat is formed on the rear surface on the opposite side, said mounting seat and said roller to form the supporting portion was the seat surface removably attached by the fastening bolt and, around the bolt hole of the mounting seat, it is preferable that the protective wall that protects the head of the fastening bolt from the collision of the fine powder is formed.
[0014]
　(9) milling roller unit of the present invention is disposed in an opening formed in the peripheral wall of the housing of the grinder, and a journal head is swingably supported on the wall by the pivot shaft, the roller of the journal head attached via a roller journal portion having a shaft-like portion to the support portion, having a roller body unit for ground roll turns with in contact with the upper surface of the grinding table rotating in the housing a solid substance fine powder comprising a grinding roller, and downward in the vertical direction of the shaft-like portion, the carrier gas outlet for blowing out the carrier gas upward is disposed, a crushing roller unit, prior to the roller journal portion, of the ( is characterized in that the roller journal protector according is attached to any one of 1) to (8).
[0015]
　(10) milling machine of the present invention, as characterized by having a grinding table which is driven rotatably supported around the axis along the vertical direction in the housing, the grinding roller unit of the above (9) wherein, the there.
[0016]
　(11) Maintenance The method of roller journal protector of the present invention is a maintenance method of the roller journal protector according to any one of the above (1) to (8), carried out at the inspection timing of the crusher, When the the whether the determined state determining step to be checked to replace the state of the roller journal protector is the preferred consumable state, the state of the roller journal protector in the state determining step is determined to be depleted state, the roller is characterized in that it has the exchange process to replace the journal protector in advance prepared a proper product.
　(12) is determined by the state determining step is a wasting condition, for the roller journal protector removed, and repaired it is determined whether the reproducible state, the repair play if it is preferred to pre-prepared to implement repair regeneration treatment as replaceable the proper product in the next exchange step.
Effect of the invention
[0017]
　According to the present invention, shield, since the carrier gas (air or inert gas) covers the portion impinging on the shaft-like portion of the roller journal portion of the grinding roller, blown up on stream of the carrier gas fines it is possible to suppress the wear occurrence of shaft-like portion due to the collision of the body. Further, since the roller journal protector is easily removably attached to the journal head by mounting panel member, good workability on the maintenance of the journal head, time to re-operation of the crusher by the operator on the maintenance is reduced, a decrease in the rate of operation of the grinder is suppressed, can contact it also reduces damaging the base material at the time of the work to be replaced.
[0018]
　Furthermore, the mounting panel member of the roller journal protector, constructed in the vertical direction below the roller support portion as an apron-like panel disposed so as to block part of the opening of the peripheral wall of the housing, the apron-like panel of the roller journal by closing the roller support portion and the pivot shaft, it is possible to suppress the wear occurrence of roller support portions and the swinging shaft due to collision of the blown obtained fine powder on stream of carrier gas. Further, in the mounting panel member (an apron-like panel), by providing detachable wear material of the wear steel plate or the like in a portion collisions fine powder, and improved durability to wear, work on the maintenance of the journal head of frequency to reduce, it can facilitate the exchange work. Further, it is possible to reduce the possibility of damaging the base material by the operator.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019]
[1] Figure 1 is a perspective view showing a part of the crusher internal configuration with a crushing roller unit with such a roller journal protector to an embodiment of the present invention.
FIG. 2 is a sectional view showing a main configuration of a grinding machine having a grinding roller unit with such a roller journal protector to an embodiment of the present invention.
3] Fig. 3A, FIG. 3B is a view showing a side face of the roller journal protector with a crushing roller unit according to an embodiment of the present invention, FIG. 3A is its overall cross sectional view, FIG. 3B is its main part it is a side view.
[4] FIG. 4 is a perspective view showing a state seen obliquely from the front side of the grinding roller unit with such a roller journal protector to an embodiment of the present invention.
FIG. 5 is a perspective view showing a main part viewed from an oblique front side and remove the grinding roller grinding roller unit with such a roller journal protector to an embodiment of the present invention.
[6] FIG. 6A, FIG. 6B is a perspective view showing a state seen from the rear lower side of the grinding roller unit with such a roller journal protector to an embodiment of the present invention, FIG. 6A is its overall perspective view FIG 6B is its partial perspective view [VIB enlarged view of FIG. 6A].
[7] FIG. 7 is a front view of the apron-like panel of the roller journal protector according to one embodiment (mounting panel member) of the present invention.
DESCRIPTION OF THE INVENTION
[0020]
　Hereinafter, with reference to the drawings, an embodiment of the present invention.
　Note that the embodiments described below are merely illustrative and are not intended to exclude various modifications and applications of techniques not explicitly in the following embodiments. Each configuration in the following embodiment, it is possible to practice with various modifications without departing from their spirit, can sift optionally or can be combined as appropriate.
[0021]
　Further, grinding machine having a grinding roller unit and the grinding roller unit having a roller journal protector according to the present invention is for pulverized by grinding solid raw materials, typical are solid a carbon-containing solid fuel such as coal and pulverized is coal pulverizer which finely divided as a raw material. The solid raw materials pulverized, this addition can be applied a variety of solid Petorokoku like the remaining biomass and oil dregs.
　Note that the "vertical" as described below, shows the upper and lower in the vertical direction (gravitational direction), also shows the direction opposite to each other in the horizontal direction for the principal with a "left-right".
[0022]
　Configuration of crusher]
　First, with reference to FIG. 2, the configuration of the crusher 10 of the present embodiment. As shown in FIG. 2, crusher 10, also referred to as vertical mill has a housing 11 forming a vertical cylindrical hollow, the center axis of the ceiling portion 11a of the housing 11, a solid such as coal to be ground injection tube 14 for introducing objects raw materials are arranged. On the pedestal 12 immediately below the feeding pipe 14, the milling table 13 for pulverizing the solid raw material is introduced from the feeding tube 14 is disposed. Milling table 13 is rotated in the vertical direction of the axial center along said central axis by a driving device (not shown).
[0023]
　The vertical upper surface of the grinding table 13 is the central axis and concentric to the annular grinding surface 13a formed in the vertical direction above the grinding surface 13a, a plurality opposite to the grinding surface 13a (e.g., two or three ) crushing rollers 21 are arranged at equal intervals in the circumferential direction of the. Each grinding roller 21 is rotatably supported on the distal end portion from the peripheral wall 11b disposed journal axis to be inclined downward in the vertical direction to the central axis side of the (rotation shaft) 22 of the housing 11.
[0024]
　Journal shaft 22 is supported by a journal head 23, from the grinding roller 21, the journal shaft 22 and the journal head 23, milling roller unit 20 is constituted. The journal head 23 is provided swing axis extending in the tangential direction of the outer circumference of the grinding table 13 (pivot pin) 24 protrudes from the housing 11 to the left and right (one and the other tangential). Milling roller unit 20, this via a pivot pin 24, ground roller 21 is in the direction away from the direction and the grinding surface 13a to approach the grinding surface 13a, and is swingably supported on the peripheral wall 11b.
[0025]
　As shown in FIG. 2, projections 23a that protrudes vertically downward is formed on the journal head 23, the stopper 25 is equipped with the peripheral wall 11b of the housing 11. Proximity of the tip of the stopper 25 abuts against the protruding portion 23a to the crushing surface 13a of the grinding roller 21 is restricted. Stopper 25, by being driven back and forth by the actuator 26, the tip position is adjusted to adjust the closest position to the grinding surface 13a of the grinding roller 21.
[0026]
　Further, the biasing device 27 applies a load for grinding solids are equipped with grinding rollers 21. Biasing device 27 includes a hydraulic cylinder 28 fixed to the peripheral wall 11b, the hydraulic cylinder 28 and a plunger 29 that is driven in the axial direction. At the top of the journal head 23 extends the arm portion 23b, by the tip of the plunger 29 is pressed against the arm portion 23b, facing downward (grinding surface 13a of pulverizing the solid on grinding surface 13a to the crushing roller 21 ) load is applied.
[0027]
　At the bottom of the housing 11, an inlet port 15 which carrier gas is fed located outside the periphery of the grinding table 13 is provided. Air compressed by the primary air blower not shown in the present embodiment, this from the inlet port 15 is fed into the housing 11 as the transport gas, the housing 11 is a high pressure atmosphere.
[0028]
　The top of the housing 11, located outside the periphery of the feeding pipe 14, divided solids (hereinafter, also referred to as fine powder, or pulverized) rotary separator (classifier) ​​for classifying the classification blade 16 17 provided It is. Further, the ceiling portion 11a of the housing 11, outlet port 18 for discharging the pulverized product was classified is provided.
[0029]
　Solid which is ground by grinding roller 21 becomes pulverized, carrier gas from the inlet port 15 into the housing 11 by driving connected to an inlet port 15 a blower (not shown) is fed, the carrier gas blowing to be described later by the upward swirling flow of carrier gas generated by the vanes 32a of the outlet 32, pulverized material rises while being dried. The elevated ground product is larger coarse powder and the secondary classifying than a predetermined particle size smaller fines powder and a predetermined particle diameter by a rotary separator 17. In that case, coarse powder, in order to suppress the conveyance from the crusher to another device, be classified by the rotary separator 17 distribution, re-grinding is performed back on grinding table 13 again. Hosotsubuko passes through the rotary separator 17 is discharged from the outlet port 18 on stream of carrier gas, it is transported from the pulverizer to another device.
[0030]
　[Milling roller unit and configuration of the periphery thereof]
　schematic configuration of a grinding roller unit 20 itself to be mounted in such a crusher 10 is substantially the same as the conventional. Hereinafter, FIG. 1, will be described with reference to Figure 3A.
[0031]
　Figure 1, as shown in FIG. 3A, the peripheral wall 11b of the housing 11 opening 11c is formed, the journal head 23 is disposed in the opening 11c, the edge of the opening 11c of the pivot pin 24 projecting to the left and right It is pivotably supported on the peripheral wall 11b of the section. Note that the opening portion 11c, a cover 30 which projects in a radial direction of the peripheral wall 11b so as not to interfere with the journal head 23 is mounted, and partitions the inside and the outside of the housing 11.
[0032]
　Milling roller 21 includes a roller housing 21a having a shaft-like portion 21b, and a fitted on removable roller main body 21c against the roller housing 21a. Also, the journal head 23, roller support portion 23c for supporting the grinding roller 21 is provided with protrusions 23a, the arm portion 23b and the pivot pin 24, projects from the roller support portion 23c downward, upward and right and left sides are, respectively stopper 25, plunger 29, abuts the peripheral wall 11b, are supported.
[0033]
　The end portion of the cover 30 side of the journal shaft 22 (one end side) is coupled to the roller support portion 23c of the journal head 23. The end portion of the central axis side of the journal shaft 22 (the other end), the roller housing 21a of the grinding roller 21 is rotatably mounted. Incidentally, the axis of the journal shaft 22 is being positioned to be inclined downwardly from the peripheral wall 11b of the housing 11 to the central axis side, the inclination angle α is about 40 degrees for example 15 degrees.
[0034]
　Carrier gas inlet port 15 connected to a blower by (not shown) is fed into the housing 11, as shown by an arrow A1 in FIG. 3A, it is provided between the circumferential wall 11b of the outer peripheral and the housing 11 of the grinding table 13 It is blown upward in the vertical direction from the carrier gas outlet 32. The peripheral portion of the carrier gas outlet 32 ​​of the grinding table 13, the vanes 32a are provided, the rotational force from the carrier gas outlet 32 ​​while rotating the carrier gas is blown upward in the vertical direction together with the grinding table 13 in addition to form a swirling flow directed vertically upward into the housing 11.
[0035]
　The position immediately above the conveying gas outlet 32 ​​is disposed roller support portion 23c of the roller housing 21a and the journal head 23 of the grinding roller 21, and further pivot pin 24 is also located. Thus, towards the surface or the like which is located vertically downward of the roller housing 21a and the roller support portion 23c and the pivot pin 24, the carrier gas blown toward the lower side in the vertical direction upwards is blown.
[0036]
　Within the housing 11, fine powder pulverized by milling roller 21 on grinding table 13 is blown up on stream of the carrier gas, the shaft-like portion 21b and the roller support portion 23c and the pivot portion thereof roller housing 21a impinging blown toward the face or the like located downwardly of the pin 24. When fine powder collides downward position to face thereof and the like of the portion of the device, because it causes damage such as a collision point wear, as a countermeasure, the grinding roller unit 20, comminuted roller support portion 23c of the journal head 23 roller the roller journal portion 20J having 21 a shaft-like portion 21b of the roller journal protector 40 is attached.
[0037]
　Configuration of roller journal protector]
　roller journal protector 40, as shown in FIG. 3B, apron-like panel (attachment panel member) 41 removably attached to the roller support portion 23c and the protrusions 23a of the journal head 23, group end portion 42a is fixed to the apron-shaped panel 41, and a shield 42 mounted arranged to so as to surround the lower part of the shaft-like portion 21b of the roller housing 21a. Incidentally, these apron-like panels 41 and the shield 42 are formed of steel (e.g. SS400, low alloy steel, etc.).
[0038]
　Apron-like panel 41 is a planar plate, attached to the roller support portion 23c so as to extend around the roller support portion 23c, not only functions as an attachment member for attaching the shield 42 to the roller support portion 23c and the like, function of protecting the roller support portion 23c and the protruding portion 23a and the pivot pin 24 from the collision of the fine powder also has.
[0039]
　Figure 7 is a front view of the apron-like panel 41, the sheet of the upper is turned vertically upward in the mounted state, a plate-like member extending in a plane in the sheet surface in the vertical direction and the horizontal direction. As shown in FIG. 7, an apron-like panel 41, the above the roller concave edge portion 41a formed in a substantially semicircular shape corresponding to a substantially semi-cylindrical vertical lower half of the outer periphery of the support portion 23c There has been formed. Apron-like panel 41 is spread flat on both sides and downward (in the direction of the mounting state to the journal head 23) from the concave edge portion 41a horizontally. Upper edge 41b which is positioned in the horizontal direction on both sides of the concave edge portions 41a, 41b and both side edges 41c, 41c is formed in a substantially straight lower edge portion below the concave edge portion 41a is a horizontal intermediate lower edge 41d and on both sides of the inclined side lower edge 41e, is formed on the bent line shape composed of a 41e.
[0040]
　Such an apron-like panel 41, as shown in FIGS. 4-7, along a lower half of the outer circumference facing the substantially semi-cylindrical vertical direction lower side of the roller support portion 23c of the concave edge portion 41a, and, its plane as spreads almost range of constant distance from the outer periphery of the roller support portion 23c, it is arranged in a direction perpendicular to the axial center line of the roller support portion 23c (axial center line of the journal shaft 22), the roller support portion It is attached to 23c.
[0041]
　This apron-like panel 41, as shown in FIGS. 1, 3 (FIGS. 3A, 3B) ~ 5, a portion of the opening portion 11c of the peripheral wall 11b of the housing 11, i.e., the roller support portion 23c the lower half of the both sides of the region of the horizontal section (direction in the mounted state to the journal head 23), and is mounted arranged so as to close the vertical region below the region of the lower half portion and their both sides above. This apron-like panel 41, as shown in FIG. 7, and laterally extending downward region (mainly upper edge (width direction of the opening 11c) horizontally from each side of the lower half of the outer periphery of the roller support portion 23c 41b, side edges 41c, a trapezoidal region) 41P1,41P1 surrounded by the side lower edge 41e, the lower region (mainly concave edge portion 41a and intermediate lower extending downwardly of the lower half periphery of the roller support portion 3c in the mounted state can be classified into region) 41P2 and between the edges 41d and at the side regions 41P1,41P1 surrounded top and bottom.
[0042]
　The collision frequency is relatively high area of ​​the fine powder of the surface of the apron-like panel 41 (the surface carrier gas is blown), the hard tile suppressing the occurrence of wear the apron-like panel 41 due to the collision of the fine powder as, hard ceramic made of ceramic tile 43 is attached. The ceramic tiles 43 (which may also be referred to as "area portion having a width which is positioned directly below the axis of the roller supporting portion 23c") the lower region collision frequency fine powder is relatively high region 41P2 mainly, are mounted to the ceramic tile 43 gaps between is limited to part of the surface is narrowed. Although mutual gap is determined from the ease of construction and the difference in thermal expansion between the ceramic tile 44 and the apron-like panel 41, as much as possible gap for protection of the apron-like panel 41 is preferably narrow. Installation position of the ceramic tile 43 may be set as required, for example, the installation position is also contemplated that shifting the pivot downstream in accordance with the turning direction of the carrier gas. In addition, it may be attached to, if necessary over the entire surface. The material of the ceramic style 43, as long as it can protect the apron-like panel 41 as the base material from the impact of the ride on the air current blown fine powder carrier gas is not particularly limited, for example, alumina, silica, zirconia , magnesia, silicon carbide, and silicon nitride, and mixtures thereof can be used.
[0043]
　On the back side of the concave edge portion 41a of the apron-like panel 41 (rear of the surface on which the carrier gas is blown opposite), 6A, 6B, the formed roller supporting portion 23c seat mounting seat 46 is formed to be fixed by fastening bolts 47 to the surface 45. The mounting seat 46, in the positions of the left and right sides of the roller support portion 23c with respect to concave edge portion 41a, is formed so as to protrude from the rear surface side at two positions of the upper and lower, to hide the back of the fastening bolt 47 not shown bolt holes are formed.
[0044]
　Around the bolt hole of the mounting seat 46, the protector ring (protection wall) 48 for protecting the head of the fastening bolt 47 to be mounted from the collision of the fine powder is formed to project. Protector ring 48 is an annular vertical wall located around the head of the fastening bolt 47 which is mounted, have a height above the height of the head of the fastening bolt 47, the head of the fastening bolt 47 parts is prevented difficulty in obtaining replacement damaged by wear. In addition, each upper edge portion 41b of the positions on both sides with respect to concave edge portion 41a of the apron-like panel 41, have hanging hook hole 49 respectively are provided, thereby enabling the support suspended during the replacement work.
　On the other hand, the seat surface 45 provided on the roller support portion 23c, the upper part corresponding to the mounting seat 46, the lower, threaded holes (not shown) is formed.
[0045]
　Apron-like panel 41 is suspended with a hook hole 49, is arranged a respective mounting seats 46 in a predetermined position of the corresponding seat surface 45, by inserting the fastening bolt 47 into the bolt holes of the mounting seat 46, by screwing fastened to threaded holes in the seat surface 45, it is attached to the journal head 23. In this attached state, the head of the fastening bolt 47 is surrounded around with the protector ring 48, also, the lower half of the vertical roller support portion 23c is protected by an apron-like panel 41, riding on the air flow of the carrier gas It is protected to inhibit abrasion from fine powder to collide blown Te.
[0046]
　Shield 42, 3 (FIGS. 3A, 3B), as shown in to 7, surrounds the semi-cylindrical region of the inner side than the peripheral wall 11b of the housing 11 in the vertically lower portion of the shaft-like portion 21b of the crushing roller 21 It is formed into Hankiridai shape to. As shown in FIG. 7, the shield 42, one side of the base end portion 42a is fixed by welding or the like in proximity to the concave edge portion 41a is disposed along the concave edge portion 41a. Shield 42 is in the attached state is formed on a semi-frustoconical tip portion 42b of the other side extends toward the roller main body 21c (semi-truncated pyramid shape), surrounding the vertically lower portion of the shaft-like portion 21b . In the shaft-like portion 21b, but fine powder riding airflow conveying gas from the carrier gas outlet 32 ​​collides is blown vertically lower portion of the shaft-like portion 21b, the shield 42 is the fine powder collides covering the portion to protect this part from the collision of the fine powder.
[0047]
　In this embodiment, the shield 42 is formed by a plurality of flat plate panels are joined to the half-frustum shape. And on the surface (the surface of the carrier gas strikes the side of the carrier gas outlet 32) of the shield 42, as hard tiles to protect the shield 42 from the collision of the fine powder, hard ceramic ceramic tiles 44 is mounted . The ceramic tiles 44 is mounted to the ceramic tile 44 gaps between the entire surface of the shield 42 is narrowed. Although mutual gap is determined from the ease of construction and the difference in thermal expansion between the ceramic tile 44 and the shield 42, as much as possible gap for protection of the shield 42 is preferably narrow. Installation position of the ceramic tiles 44 may be set as necessary, may be partially mounted. Shield 42 of this embodiment, a plate-like ceramic tiles 44 since a plurality of flat plates are formed are joined can be easily mounted.
　Incidentally, the attachment to a base material of the ceramic tiles 43, 44 an apron-like panels 41 and the surface of the shield 42, for example a plug which fits into the mounting hole of the ceramic tiles 43 and 44 such as by welding, general attachment technique can be applied.
[0048]
　The shape of the shield 42 is Hankiridai shape, to fit to the outer periphery of the shaft-like portion 21b of the crushing roller 21 is expanded toward the roller body portion 21c, the tip 42b from the base end portion 42a It has been gradually enlarged toward. Then, the semi-vertical lower region of the frustum-shaped in the mounted state of the shield 42 (in this case the flat panel portion of one bottom) 42c is, the center portion toward the proximal end 42a to the distal end portion 42b (the housing 11 toward) is formed so as to downwardly inclined from the horizontal direction at an angle of more than the angle of repose of fine powder theta.
[0049]
　Except semi frustum shape of the lower region 42c in the mounted state of the shield 42, since downward inclined from the horizontal direction from the base end portion 42a at an angle of more than the lower region 42c to the distal portion 42b, the inner surface of the shield 42 (the surface upwardly facing surface) opposite to the can, in mounted state, in any position, it is adapted to tilt at an angle of more than the angle of repose of fine powder.
　Incidentally, the angle of repose of the fine powder, so depends on the surface state of the fine powder and the shield 42, it is preferable to set the angle θ in accordance with the fine powder to be produced. Covers the airflow blown parts fine powder hits riding of carrier gas, within the arrangement space in the housing 11, and more preferably by setting a large angle θ with a margin than the angle of repose of the fine powder. For example, in the case of pulverized coal fine powder was pulverized coal, the angle θ preferably in a range of 50 degrees from 40 degrees.
[0050]
　[Action and Effect]
　roller journal protector 40 according to an embodiment of the present invention, the grinding roller unit 20 and the grinder 10 provided therewith, which is configured as described above, apron-like panel (attachment panel member) shield 42 detachably mounted on the journal head 23 by 41, the collision of the shaft-like portion covering the vertically lower half of the fine powder blown hits riding airflow carrier gas at 21b fine powder grinding roller 21 to protect the shaft-like portion 21b from. Thus, it is possible to prevent wear of the shaft-like portion 21b of the crushing roller 21 due to the collision of the fine powder, can extend the life of equipment.
[0051]
　Further, an apron-like panel 41, part of the opening 11c of the peripheral wall 11b of the housing 11 in the vertical direction below the roller support portion 23c, i.e., the lower half vertical and both sides contrast roller support portion 23c since the mounted for protection from the impact of the fine powder blown riding space for airflow carrier gas, in addition to the ability to attach the shield 42 to the roller support portion 23c, etc., Ya roller support portion 23c and the protrusion 23a It serves to protect the collision of fine powder blown riding a pivot pin 24 to the air flow of the transport gas. Thus, it is possible to prevent wear of the roller support portion 23c and the protruding portion 23a and the pivot pin 24 due to the collision of the fine powder, can extend the life of equipment.
[0052]
　Further, since the hard ceramic tiles 43 and 44 is mounted on the surface of the apron-like panels 41 and the shield 42, the collision of the fine powder blown riding surface of the apron-like panels 41 and the shield 42 to the air flow of the transport gas It can be protected from the surface of the apron-like panels 41 and the shield 42 be abrasion is prevented or inhibited by the impact of the fine powder to be sprayed riding airflow carrier gas.
[0053]
　For apron-like panel 41, mainly the lower region 41P2 collision frequency fine powder is relatively high area, since it is fitted with ceramic tiles 43 is limited to part of the surface, of the ceramic tiles 43 material it is possible to suppress the cost. Of course, it is mounted ceramic tiles 44 is limited to a relatively high area frequency of collisions fine powder obtained the same effect if also shield 42.
[0054]
　Further, the inner surface of the shield 42 (upper surface) is adhered fine powder to rise up in the carrier gas transporting the gas, but since the inner surface of the shield 42 is inclined at an angle of more than the angle of repose of fine powder at any point , deposited fine powder by gravity, falls while sliding the inner surface of the shield 42. This can prevent the fine powder accumulates in the inner surface of the shield 42.
[0055]
　The roller journal protector 40, because it is fixed by being fastened with fastening bolts 47 the mounting seat 46 formed on the rear surface of the apron-like panel 41 to the seat surface 45 of the roller support portion 23c, attachment and detachment of the fastening bolts 47 replacing the roller journal protector 40 (shield 42 and an apron-like panel 41) can be readily performed by.
[0056]
　Further, the protector ring 48 around the bolt holes of the mounting seat 46 is formed to project, the head of the fastening bolt 47 to be mounted is protected from the collision of the fine powder to be sprayed riding airflow carrier gas, fastening head of the bolt 47 is prevented or suppressed from being worn by collisions fine powder, without the detachable tool unusable head of the fastening bolt 47 is worn, at the time of replacement of the roller journal protector 40, the removal of the fastening bolts 47 can be carried out without hindrance.
[0057]
　Note that the maintenance of the roller journal protector 40 is preferably carried out in the following manner.
　That is, usually grinder 10 carries out a check of the periodic inspection such as regularly carried out, in the periodic inspection timing or in other irregular inspection timing, required to check the status of the roller journal protector 40 exchange determines whether the consumable state (state determining step). Here, when the state of the roller journal protector 40 if it is determined that the required power consumption state of the exchange, or it is determined that the person who had been replaced by estimating the future usage are preferred consumable state , the roller journal protector 40 will be replaced with a pre-prepared the proper product (exchange process). Of course, if the state of the roller journal protector 40 is determined that there is no need for replacement until the next inspection, replacement may not be performed.
[0058]
　And, for the roller journal protector 40 is removed by the exchange is determined by the state determining step is a wasting condition, for example, to implement repair regeneration process of replacement replacement of hard tiles, used in the next exchange as an appropriate product that can be (appropriate product), to prepare in advance of the exchange. If the repair regeneration process is impossible, to prepare a new one. The appropriate product of the roller journal protector 40 includes a new and this repair reproduced treated refurbished.
[0059]
　Thus, to determine the exhaustion state of the roller journal protector 40 at the inspection timing of crusher 10, by replacing the appropriate product, if necessary, perform a maintenance of the roller journal protector 40 efficiently and appropriately and easily it can, roller journal portion 20J of the milling roller unit 20 can be protected for a long time, and by extension can be secured long-term performance of the grinder 10, it is possible to extend the mechanical life.
[0060]
　Incidentally, the roller journal protector 40, always periodic inspection timing without determining the power consumption state and configured to exchange the roller journal protector 40 which is prepared for replacement, the roller journal protector 40 has been removed by exchange suitably performs reprocessing, if to store as a replacement can be a downtime of the crusher 10 according to the maintenance of the roller journal protector 40 can short time process shorter.
[0061]
　[Others]
　While there have been described the embodiments of the present invention, the present invention can be carried out by appropriately changing the above-described embodiments without departing from the spirit of the invention.
　For example, in the above embodiment, as hard tiles covering the surface of the apron-like panels 41 and the shield 42, but using the hard ceramic ceramic tiles 43 and 44, the hard tile is not limited to this, the durability necessary strength applicable as long as made of wear-resistant material having.
[0062]
　Of course, it is preferable that the base material itself of the apron-like panels 41 and the shield 42 also constitutes a highly durable strength material. In this case, depending on the endurance strength of the material of the base material, hard tiles can be unnecessary. However, as in the present embodiment, the apron shaped panel 41 and the shield 42 is formed of general steel, by mounting the hard tile to the required location of the surface, it is possible to suppress the material cost low.
[0063]
　In this embodiment, the shield 42 is coupled a plurality of flat panels is formed in a semi-cone shape, but so that it can be easily mounted a planar ceramic tiles 44, the shield 42 , in accordance with the shape of the shaft-like portion 21b of the roller housing 21a, it may be formed in a curved shape. Although the shield 42 is formed in a semi-cone shape, if it is protected from the collision of the fine powder to be sprayed riding airflow carrier gas, it may be formed in a semi-cylindrical shape.
[0064]
　Further, in the above embodiment, the protective wall portion is constituted by the protector ring is an annular vertical wall, the protective wall of the head of the fastening bolt 47 located around the head of the fastening bolt 47 which is mounted the ability to protect is not limited to the annular vertical wall.
DESCRIPTION OF SYMBOLS
[0065]
　10 pulverizer
　11 housing
　11a ceiling portion of the housing 11
　11b housing 11 peripheral wall of
　11c opening of the housing 11
　12 base
　13 grinding table
　13a grinding surface
　14 feeding pipe
　15 inlet port
　16 classifying blades
　17 rotary separator (classification
　device) 18 outlet port
　20 milling roller unit
　20J roller journal
　21 grinding roller
　21a grinding roller 21 of the roller housing
　21b roller housing 21a of the shaft-like portion
　the roller main body of 21c grinding roller 21
　22 journal shaft (rotation
　shaft) 23 journal head
　23a projecting portions
　23b arm
　23c roller support portion
　24 pivot pin
　25 stopper
　26 actuator
　with 27 biasing device
　28 hydraulic cylinder
　29 the plunger
　30 covers
　32 conveying gas outlet
　32a vane
　40 roller journal protector
　41 apron-like panel (attachment panel
　member) concave edge portion of the 41a apron-like panels 41
　upper edge of 41b apron-like panel 41 part
　41c apron side edges of the shaped panel 41
　intermediate lower edge of 41d apron-like panel 41
　side lower edge of the 41e apron-like panel 41
　side areas of the 41P1 apron-like panel 41
　the lower region of the 41P2 apron-like panels 41
　42 shield
　42a proximal end of the shield 42
　42b distal end portion of the shield 42
　ceramic tiles as 43 hard tile
　45 seating surface
　46 mounting seat
　47 fastening bolt
　48 protective wall (protector
　ring) Peghole for 49 suspended

The scope of the claims
[Requested item 1]
Is disposed in an opening formed in the peripheral wall of the housing of the grinder, and a journal head supported swingably to said peripheral wall by the swinging shaft,
the roller journal portion having a shaft-like portion to the roller support portion of the journal head attached via a, and a grinding roller having a roller body unit for grinding the fine powder was brought into contact with the upper surface of the grinding table rotating and rotated together with it solids in the housing,
　vertical of the shaft-like portion the downward, the carrier gas outlet for blowing out the carrier gas upward is disposed, it is equipped to the grinding roller unit,
　a protector for protecting the roller journal portion, from the collision of the fine powder to be transported together with the carrier gas a is,
　with the mounting panel member attached to the journal head,
　forming a semi-frustum shape which surrounds the vertically lower portion of the shaft-like portion Is, base end portion is fixed to the mounting panel member, extends toward the distal end the roller main body side, the collision of the fine powder to cover the carrier gas strikes part from the carrier gas outlet having a shield to protect against
the roller journal protector, characterized in that.
[Requested item 2]
　Vertically lower region of the semi-frustoconical in mounted state of the shield is formed from the proximal end to descend inclined from the horizontal plane at an angle of more than the angle of repose of the fine powder toward the tip
roller journal protector according to claim 1, wherein a.
[Requested item 3]
　The shield is a plurality of flat plates are joined is formed on the semi-cone shape
according to claim 1 or 2 roller journal protector wherein a.
[Requested item 4]
　Said carrier gas said carrier gas strikes the side of the surface from the outlet of the shield is made of a hard tile to protect the shield from the collision of the fine powder is attached
in claims 1 to 3, characterized in that roller journal protector according to any one.
[Requested item 5]
　The mounting panel member, the rollers in the vertical direction below the support portion is disposed so as to block a portion of said opening, protecting at least a portion of the roller journal and the pivot shaft from the collision of the fine powder
roller journal protector according to any one of claims 1 to 4, wherein the.
[Requested item 6]
　The mounting panel member is concave edge of semicircular shape arranged along the lower half periphery while being formed in accordance with the lower half of the outer peripheral shape of the roller support portion upward in the vertical direction become part mounted state comprises a section,
　the proximal end of the shield, the closely fixed to the concave edge portion,
　the side surface of the carrier gas strikes from and positioned vertically below the shield mounted state the conveying gas outlet the hard tiles to protect the mounting panel member from the impact of the fine powder is attached
roller journal protector according to claim 5, wherein a.
[Requested item 7]
　The mounting panel member, and side regions from each side of the lower half periphery of the roller support portion extending in the width direction and vertically below the opening in the mounted state, the said roller support portion in a mounted state and a lower region which extends vertically below the lower half periphery,
　the hard tile is mounted on at least a portion of the lower region
roller journal protector according to claim 6, wherein a.
[Requested item 8]
　Wherein the mounting panel said carrier gas transporting the gas strikes the side surface of the air outlet member mounting seat is formed on the rear surface on the opposite side, fastening the said rollers to form the supporting portion was the seating surface and the mounting seat detachably mounted in use bolts
　around the bolt holes of the mounting seat, the protection wall for protecting the head of the fastening bolt from the collision of the fine powder is formed
claims, characterized in that 5 roller journal protector according to any one of 1-7.
[Requested item 9]
　Is disposed in an opening formed in the peripheral wall of the housing of the grinder, and a journal head supported swingably to said peripheral wall by the swinging shaft,
　the roller journal portion having a shaft-like portion to the roller support portion of the journal head attached via a, and a grinding roller having a roller body unit for ground roll turns with in contact with the upper surface of the grinding table rotating in the housing a solid substance fine powder,
　wherein the shaft-like portion vertically downwards, the carrier gas outlet for blowing out the carrier gas upward is disposed, a crushing roller unit, of
　the front roller journal portion, the roller according to any one of claims 1 to 8 journal protector mounted
grinding roller unit, characterized in that.
[Requested item 10]
　Pulverized table driven rotatably supported around the axis along the vertical direction in the housing,
　having a crushing roller unit according to claim 9
, characterized in that, grinder.
[Requested item 11]
　A maintenance method of the roller journal protector according to any one of claims 1 to 8,
　carried out at the inspection timing of the crusher,
　or replacement check the state of the roller journal protector is the preferred consumable state a state determining step of determining whether,
　After the state of the roller journal protector in the state determining step is determined to be the power consumption state, and a replacement step of replacing the roller journal protector Prerequisite the proper products
that wherein the maintenance management method of the roller journal protector.
[Requested item 12]
　It is determined to be the power consumption state in the state determining step, for the roller journal protector removed, and repaired it is determined whether the reproducible state, the repair play if the next exchange step in pre-prepared to implement repair regeneration treatment as replaceable the proper products
and wherein the maintenance management method of the roller journal protector of claim 11 wherein.