DESCRIPTION
Title of Invention
PUSH-IN SCREW DEVICE AND ROLL-MOLDING MACHINE
5
Technical Field
[0001]
The present invention relates to a push-in screw device suitable for use in a
roll'-molding machine which compresses a raw material made by kneading, for example,
10 a fine powder and a binder to be molded into a plate shape, and a roll-molding machine
including the push-in screw device.
Priority is claimed on Japanese Patent Application No. 2010-095648, filed on
April 19, 2010, the content of which is incorporated herein by reference.
15 Background Art
[0002]
H th^rto s mold ng de e-that compresse^a g-anulated- aw material-made
M
by kneading a fine powder and a binder, an agglomeration roller compactor is used.
The agglomeration roller compactor includes, as illustrated in FIG. 4, molding rolls 104
20 having a stationary roll 102 and a movable roll 103 which individually have rotating
shafts and form a pair. The stationary roll 102 is installed so that the position thereof is
fixed. On the other-hand, the movable roll 103 receives a predetermined pressure from
a hydraulic cylinder 106 and is pressed against the stationary roll 102 side. A hopper
108 is provided above the molding rolls 104. The hopper 108 has a casing 111 and a
25 push-in screw 112 disposed therein. The push-in screw 112 includes a screw blade 114
2
helically formed around a rotary drive shaft 113. In'addition, by rotating the push-in
screw 112 by the driving force of a driving unit 115, a raw material 109 charged into the
casing 111 is supplied to a gap 105 between the stationary roll 102 and the movable roll
103, and the raw material 109 is pushed downward by the screw blade 114. The raw
5 material 109 pushed into the gap 105 receives a compression force by the molding rolls
104 and thus becomes a molded product 110 having a plate shape.
[0003]
Besides the device, a screw conveyor of the related art which transports a
granular material mainly in the horizontal direction by a screw blade is disclosed in, for
10 example, Patent Document 1 and the like.
[0004]
In an agglomeration roller compactor, a raw material made by kneading
powdered coal or the like and a binder such as tar having viscosity is transported.
Therefore, when the raw material is transported by a plurality of helically wound screw
15 blades, the raw material tend to remain between the screw blades. However, for stable
and continuous production of molded products, the raw material needs to be supplied to
molding rolls without being deported between the screw blades When the raw
material becomes adhered to the screw blades and blocks the space therebetween, the raw
material may not be stably supplied. Therefore, an operation of removing the raw
20 material blocking the spaces between the screw blades has to be frequently performed.
[0005]
In Patent Documents 2 and 3, screw conveyors having a plurality of screws are
disclosed. In Patent Document 2, the helical directions and rotational directions of
adjacent screws are reversed respectively to prevent a transported matter from being
25 adhered to screw blades. In Patent Document 3, a plurality of screws of which the
3
helically wound directions are reversed each other and which have different pitches are
rotated in the reverse directions at a rotation frequency ratio which is the reciprocal of the
ratio between the pitches of the screws so as to scrape off the matter adhered to the
counter screws each other.
5 [0006]
In the case of the agglomeration roller compactor, in order to satisfy the demand
for quality such as high density and high strength of molded products, the raw material
needs to be uniformly pressed between the rolls. However, the techniques disclosed in
Patent Documents 2 and 3 have a configuration in which the transported matter is
10 transported in the horizontal direction and is discharged from a discharge opening, and
the operation of pressing the transported matter by the screw blades cannot be achieved,
so that it is impossible to satisfy the demand.
[0007]
In Patent Document 4, a push-in screw for an agglomeration roller compactor by
15 the applicant of the present invention is disclosed. This push-in screw has a pitch
reduced toward the transport direction and includes a screw blade having three
-incl nat anglers hat acTaw material can be sufficiently pushed after-thaw material
is prevented from adhering to the screw blade and the like.
20 Citation List
Patent Document
[0008]
[Patent Document I] Japanese Unexamined Patent Application, First Publication
No. H07-304511
25 [Patent Document 2] Japanese Unexamined Patent Application, First Publication
4
No. H11-314728
[Patent Document 3] Japanese Unexamined Patent Application, First Publication
No. 2002-179235
[Patent Document 4] Japanese Unexamined Patent Application, First Publication
5 No. 2008-36692
Summary of Invention
Technical Problem
[0009]
10 However, even in the push-in screw disclosed in Patent Document 4, there is a
concern that the raw material may easily adhere to the inner wall of a casing of a hopper
and be stagnated, and the push-in screw provided at both ends in order to scrape off the
raw material adhered to the inner wall of the casing may be overloaded.
[0010]
15 The present invention has been made taking the foregoing circumstances into
consideration, an object of which is to provide a push-in screw device capable of stably
and uniformly pushing out ra-w aterial and a roll=molding machine u rig-the
push-in screw device.
20 Solution to Problem
[0011]
In order to achieve the above problems, the present invention adopts the
following measures.
(1) A push-in screw device according to an aspect of the present invention
25 includes: a plurality of push-in screws which are disposed in a hopper and pump a raw
5
material charged from an upper portion of the hopper to a lower side of the hopper; and a
driving mechanism which rotates the push-in screws, wherein each of the push-in screws
has a rotary drive shaft extending along a vertical direction and a screw blade formed in a
helical shape around the rotary drive shaft. In addition, the push-in screws are arranged
5 so that the respective rotary drive shafts are lined up along the same straight line in a plan
view, positions of lower ends in the vertical direction of the screw blades are the same
and winding directions of the helical shapes of the adjacent screw blades are reversed,
and when the two push-in screws at the center in the lined-up direction among the
push-in screws are referred to as center screws, a part between the rotary drive shafts of
10 the center screws in plan view, a rotational direction of each of the screw blades is
coincident with a supply direction of the raw material.
[0012]
(2) The push-in screw device described in (1) may employ a configuration in
which the screw blade of each of the center screws includes, from above to below in the
15 vertical direction: a first transferring blade which has a first inclination angle in a
longitudinal cross-sectional view and sends the raw material downward in the vertical
direction;ai-frrst conyolidatian-blade which has-a-second inclination angle that-i smallerthan
the first inclination angle in the longitudinal cross-sectional view, and removes a gas
contained in the raw material sent from the first transferring blade; and a first push-in
20 blade which has a third inclination angle that is smaller than the second inclination angle
in the longitudinal cross-sectional view, and pumps the raw material sent from the first
consolidation blade downward.
[0013]
(3) In (2), a configuration may be employed in which, when the two push-in
25 screws at both side ends in the lined-up direction among the push-in screws are referred
6
to as outside screws, the screw blade of each of-the outside screws includes, from above
to below in the vertical direction: a second transferring blade which has a fourth
inclination angle in the longitudinal cross-sectional view and sends the raw material
downward in the vertical direction; and a second push-in blade which has a fifth
5 inclination angle that is smaller than the fourth inclination angle in the longitudinal
cross-sectional view and pumps the raw material directly sent from the second
transferring blade downward.
(4) In (3), a configuration may be employed in which the second transferring
blade is mounted to the rotary drive shaft so that a lower end of the second transferring
10 blade is positioned at a position shifted to an upper side by 90° in a rotational direction of
the rotary drive shaft from an upper end of the second push-in blade.
(5) In (3), a configuration may be employed in which a height of an upper end of
the screw blade of each of the outside screws is lower than a height of an upper end of
the screw blade of each of the center screws.
15 (6) A roll-molding machine according to an aspect of the present invention
includes: a hopper which has a casing that stores a raw material, and a push-in screw
----c ev cesi pushes otit^the aw nia 1 in tl e casino. lower side- of-the casing; and
pair of a stationary roll and a movable roll, which interpose the raw material pushed out
of the hopper therebetween to be compression molded, wherein the push-in screw device
20 is the push-in screw device described in any one of (1) to (5), and a lined-up direction of
each of the push-in screws overlaps an extension direction of a gap between the
stationary roll and the movable roll in a plan view.
Advantageous Effects of Invention
25 [0014]
7
According to the push-in screw device of the present invention, the raw material
can be stably and uniformly pushed out. Accordingly, for example, when the push-in
screw device is applied to a roll-molding machine (agglomeration roller compactor), a
molded product with high quality can be molded by molding rolls.
5 According to the roll-molding machine of the present invention, the same
operational effects as those of the push-in screw device can be obtained.
Brief Description of Drawings
[0015]
10 FIG. 1 is a longitudinal cross-sectional view illustrating the schematic
configuration of an agglomeration roller compactor including a push-in screw device
according to an embodiment of the present invention.
FIG. 2 is a longitudinal cross-sectional view of the push-in screw device.
FIG. 3 is a diagram illustrating the push-in screw device and is a transverse
15 cross-sectional view taken along the line B-B of FIG. 2.
FIG. 4 is a longitudinal cross-sectional view illustrating the schematic
onfigurat an oUan agglomeratron Toilet-om actor incluctiirg-a-push-in-screw device
according to the related art.
20 Description of Embodiments
[0016]
Hereinafter, a push-in screw device for an agglomeration roller compactor
(hereinafter, a push-in screw device) according to an embodiment of the present
invention, and an agglomeration roller compactor including the same (roll-molding
25 machine) will be described with reference to the drawings.
8
[0017]
FIG. 1 is a longitudinal cross-sectional view illustrating the schematic
configuration of an agglomeration roller compactor 1 of this embodiment.
The agglomeration roller compactor 1 includes: a hopper 8 having a casing 11
5 that stores a raw material 9, and a push-in screw device 12 that pushes out the raw
material 9 in the casing 11 in the downward direction; and a stationary roll 2 and a
movable roll 3 forming a pair, which interpose the raw material 9 pushed out of the'
hopper 8 therebetween to be compression molded.
The stationary roll 2 and the movable roll 3 of the agglomeration roller
10 compactor 1 respectively have rotating shafts 2a and 3a which are provided along the
horizontal direction and are in parallel, and rotate against each other in a plan view. In a
state where the raw material 9 is supplied from above toward a gap 5 between molding
rolls 4 constituted by the stationary roll 2 and the movable roll 3 forming a pair, the
movable roll 3 rotates in the reverse direction to the stationary roll 2 while receiving a
15 biasing force by a hydraulic cylinder 6 and applying a predetermined pressing force on
the stationary roll 2. As a result, the raw material 9 is pushed out in the downward
direction through the-gap 5-while being-Ganrpressed bythe stattonary- roll -2-and the
movable roll 3. The movable roll 3 at this time is able to continuously move along the
direction of the arrow A so as to cause the pressure applied to the raw material 9 pushed
20 into the gap 5 formed between the movable roll 3 and the stationary roll 2 to maintain a
predetermined value. In addition, the movable roll 3 receives the repulsive force from
the raw material 9 when applying a pressure thereto, so that the width of the gap 5 is
increased, and molded products 10 having a plate shape with the same thickness as the
width thereof are molded. In addition, a load cell? is mounted on the stationary roll 2
25 to perform feedback control for measuring the pressing force by the hydraulic cylinder 6
9
and maintaining the pressure value at a constant level.
[0018]
The hopper 8 is provided above the gap 5 of the molding rolls 4. The hopper 8
has the casing 11 and the push-in screw device 12 disposed therein.
5 The push-in screw device 12 includes: a plurality of push-in screws 12a to 12d
which are disposed inside the casing 11 of the hopper 8 and pump the raw material 9
charged from the upper portion of the hopper 8 to the lower side of the hopper 8, and a
driving unit 15, (driving mechanism) that rotates the push-in screws 12a to 12d.
The push-in screws 12a to 12d are installed to be lined up along the extension
10 direction of the gap 5 above the gap 5. That is, the push-in screws 12a to 12d are
disposed so that their respective rotary drive shafts 13 are lined up on the same straight
line along the extension direction of the gap 5 in the plan view. There are two or more
push-in screws 12a to 12d, and when the molding rolls 4 are increased in size, one or
more push-in screws are provided on each of both sides of two push-in screws provided
15 at the center in symmetry. Each of the push-in screws 12a to 12d includes the rotary
drive shaft 13 and a screw blade 14 provided in a helical shape around the rotary drive
h-aft 13-to belntegrated-therewith. In-addition, as theersh-in-sciew-1-4-is-6tate-d whil^
being integrated with the rotary drive shaft 13, the raw material 9 charged into the casing
11 may be pushed into the gap 5 of the molding rolls 4.
20 [0019]
As illustrated in FIG 1, the upper end of the rotary drive shaft 13 of each of the
push-in screws 12a to 12d is connected to the driving unit 15 that rotates the rotary drive
shafts 13 on the upper side of the hopper 8. The driving unit 15 includes, for example, a
motor (not shown) and a reducer. In addition, the raw material 9 made by kneading a
25 fine powder such as a powdered coal with a particle size of 0.5 mm or less and a binder
10
such as tar is supplied into the hopper 8 from a supply opening 16 obliquely provided in
the upper portion of the hopper 8.
[0020]
FIG 2 illustrates the push-in screw device 12 of this embodiment. In the
5 push-in screw device 12, the two push-in screws 12b and 12c are provided at the center
in the lined-up direction, and the push-in screws 12a and 12d are disposed on the outsides
of the two push-in screws 12b and 12c one by one.
FIG 3 is a plan cross-sectional view of the four push-in screws 12a, 12b, 12c,
and 12d'illustrated in FIG 2, taken along the line B-B- of FIG. 2, where the helical
10 winding directions of screw blades 14a, 14b, 14c, and 14d and the rotational directions of
the drive shafts 13 are indicated by the arrows. In the push-in screws 12a, 12b, 12c, and
12d, the helical winding directions of the adjacent push-in screws are reversed, and the
raw material 9 placed on all the screw blades 14a, 14b, 14c, and 14d is rotated in a
direction to be transported to the front ends, that is, transported downward in the vertical
15 direction. For example, in the push-in screw 12b on the left from the two push-in
screws at the center of FIG 2, the helical screw blade 14b is wound counterclockwise in
the-figure as v ewe from-above the rotarydrive shaft 13 -a rllustrated-in-FI 3-- I
addition, as the push-in screw 12b is rotated clockwise in the figure (the direction of the
arrow rb) as viewed from above in the same manner, the raw material 9 is moved
20 downward along the screw blade 14b, and the raw material 9 is pressed against the
molding rolls 4 by a lower end surface 21 of the screw blade 14b. That is, as illustrated
in FIG. 3, the push-in screws 14b and 14d having a helical shape wound
counterclockwise in the figure as viewed from above are rotated in the direction of the
arrows rb and rd which are clockwise in the figure as viewed from above, and the push-in
25 screws Na and 14c having a helical shape wound clockwise in the figure are rotated in
11
the direction of the arrows ra and re which are counterclockwise.
[0021]
In the peripheries of the rotary drive shafts 13 of the two push-in screws 12b and
12c (center screws) provided at the center position (the center position in the axial line
5 direction of the molding rolls 4) in the lined-up direction among the push-in screws 12a
to 12d, the screw blades l4b and 14c of which the inclination angles are changed to be
reduced toward the lower end side from the upper end side are provided. The screw
blades 14b and 14c of the push-in screws 12b and 12c at the center have helical shapes of
which the pitch intervals are the same and which are wound in the reverse direction and
10 thus rotate against (in the reverse direction) each other when viewed from the supply
opening 16 of the hopper 8. That is, as illustrated in FIG. 3, when the raw material 9 is
supplied from the upper side in the figure, as viewed from the raw material supply side,
the push-in screws are rotated in a direction approaching each other, so that the raw
material 9 can be efficiently received between the screw blades 14b and 14c. More
15 specifically, in the case where the part between the rotary drive shafts 13 of the screws
12b and 12c is viewed in the plan view as illustrated in FIG 3, the rotational direction of
each ofthescrewblades- N land 14c is-coincident-with the supplyd recto of the-raw----
material 9. Therefore, as viewed from the raw material 9 supplied from a side of the
upper portion of the hopper 8, a large inlet is formed between the screw blades 14b and
20 14c at the center, and the opening is gradually narrowed toward the gap between the
screw blades 14b and 14c. Moreover, the screw blades l4b and 14c rotate against each
other so as to guide and send the raw material 9 toward a direction in which the opening
is narrowed. Therefore, it is possible to cause the raw material 9 to be efficiently
received between the screw blades 14b and 14c.
25 [0022]
12
Moreover, the inclination angles of the screw blades 14b and 14c of the push-in
screws 12b and 12c at the center are reduced toward the lower end sides from the upper
ends of the respective rotary drive shaft 13. That is, in each of the screw blades 14b and
14c, a transferring blade 22 (first transferring blade) that has a large inclination angle
5 (first inclination angle) in a longitudinal cross-sectional view and sends the raw material
9 to the lower side of the hopper 8 (downward in the vertical direction), a consolidation
blade 23 (first consolidation blade) that has an intermediate inclination angle (second
inclination angle) smaller than the large inclination angle in the longitudinal
cross-sectional view and removes a gas contained in the raw material 9 transported from
10 the transferring blade 22, and a push-in blade 24 (first push-in blade) that has a small
inclination angle (third inclination angle) smaller than the intermediate inclination angle
in the longitudinal cross-sectional view and applies a force to push the raw material 9 in
the molding rolls 4from the consolidation blade 23 are sequentially formed on the outer
periphery of the corresponding rotary drive shaft 13 once for each revolution.
15 It is preferable that the inclination angle 01 of the push-in blade 24 be equal to
or higher thanl0° and equal to or less than 15°, the inclination angle 02 of the
consolidation blade 23 be equal to or higher than 1.5 times and equal to or loss than 2.5
times the inclination angle 01 of the push-in blade 24, and the inclination angle 03 of the
transferring blade 22 be higher than 2.5 times and equal to or less than 3.5 times the
20 inclination angle 01 of the push-in blade 24. In addition, all the inclination angles 01 to
03 are inclination angles with respect to planes orthogonal to the rotary drive shafts 13.
Since the push-in screws 12b and 12c at the center are rotated in the direction in
which the raw material 9 is transported downward as described above, the raw material 9
supplied to the hopper 8 through the supply opening 16 is first sent to the lower side of
13
the hopper 8 by the transferring blades 22 due to the rotation of the push-in screws 12b
and 12c at the center. Subsequently, the raw material 9 passing through the transferring
blades 22 is subjected to removal of voids from the raw material by the consolidation
blades 23, and is then pushed into the gap 5 (FIG 1) of the molding rolls 4 by the lower
5 end surfaces 21 of the push-in blades 24. Here, the positions of the lower ends in the
vertical direction of the screw blades 14a to 14d are the same, and the helical winding
directions of the adjacent screw blades of the screw blades 14a and 14d are reversed.
Therefore, the raw material 9 can be pushed out by a force with a uniform distribution
along the lined-up directions of the push-in screws 12a to 12d without causing the raw
10 material 9 to be stagnated.
Moreover, stable supply, degassing, and compression of the raw material 9 are
performed simultaneously with the transportation of the raw material 9 by the
transferring blade 22, the consolidation blade 23, and the push-in blade 24 having their
unique inclination angles respectively. In addition, the raw material 9 is transported-
15 while the degree of compression is increased toward the lower side. Therefore, it is
difficult for the raw material 9 to be adhered between the screw blades 14b and 14c, and
the raw-material-9 s rablTpu lled-taward-the gap 5 of the-molding-rolls 4.
4
[0023]
The push-in screws 12a and 12d (two outside screws on both ends in the
20 lined-up direction of the push-in screws 12a to 12d) provided on both outsides of the
push-in screws 12b and 12c at the center have the screw blades 14a and 14d in a helical
shape wound in reverse directions to the adjacent push 4n screws 12b and 12c at the
center.
Both of the outside push-in screws 12a and 12d do not have the consolidation
25 blades 23 that the push-in screws 12b and 12c at the center therebetween have and are
14
provided with only the transferring blades 22 and the push-in blades 24 from the upper
ends of the rotary drive shafts '13 toward the lower end sides. That is, each of the screw
blades 14a and 14d of the respective push-in screws 12a and 12d includes: the
transferring blade 22 (second transferring blade) that has an inclination angle (fourth
5 inclination angle) which is the same as the large inclination angle from above to below in
the vertical direction and sends the raw material 9 downward in the vertical direction;
and the push-in blade 24 (second push-in blade) that has an inclination angle (fifth
inclination angle smaller than the fourth inclination angle) which is the same as the small
inclination angle and pumps the raw material 9 directly sent from the transferring blade
10 22 downward.
In addition, the lower end of the transferring blade 22 which is relatively on the
upper end side is disposed to be shifted to the upper side by 90° from the upper end of
the push-in blade 24 on the lower end side toward the rotational direction of the rotary
drive shaft 13, that is, by 1/4 revolution of the rotary drive shaft 13. As such, by
15 omitting the consolidation blades 23 of the push-in screws 12a and 12d on the outsides,
the raw material 9 is not excessively increased in density in the vicinity of a side wall 31
ien cga s1 1 acing the pus -m s c r e w s 1-2a a n 12d. As amt,resin ante djJp-liec
I
to the raw material 9 when the raw material 9 is lowered while slidably contacts the side
wall 31 can be reduced, so that overload on the push-in screws 12a and 12d on the
20 outsides can be suppressed. In addition, by displacing the height positions of the
transferring blades 22 of the push-in screws 12a and 12d on the outsides and the height
positions of the transferring blades 22 of the push-in screws 12b and 12c at the center
(more specifically, the height positions of the upper ends of the transferring blades 22 of
the push-in screws 12a and 12d on the outsides are lower than the height positions of the
25 upper ends of the transferring blades 22 of the push-in screws 12b and 12c at the center),
15
the raw material 9 can be suppressed from being adhered to the side wall 31 of the casing
11, so that the raw material 9 can be easily and smoothly transported downward.
[0024]
All the lower ends of the push-in blades 24 of the push-in screws 12b and 12c at
5 the center and the push-in screws 12a and 12d on the outsides are at substantially the
same height direction positions and uniformly press the raw material 9 against the
molding rolls 4at the lower end surfaces 21 of the push-in blades 24.
[0025]
According to the push-in screw device 12 having the above-described structure,
10 the raw material 9 is prevented from being adhered to the screw blades 14 (14a to 14d) or
the side wall 31 on the inside of the casing 11, so that the raw material 9 can be stably
supplied to the molding rolls 4, and the raw material 9 can be uniformly pressed against
the molding rolls 4.
[0026]
15 In addition, although the number of push-in screws 12a to 12d is not limited to 4,
in order to press the raw material 9 so as to uniformize the distribution along the axial
line directiomofthe molding-rolls-4-,it-is preforable-that-the nirmbe b-e-even.- In-tile case
where the number is 2, in the above embodiment, only the two push-in screws 12b and
12c at the center may be provided.
20 [0027]
While the exemplary embodiments of the invention have been described, the
present invention is not limited to the* examples. It should be understood by those
skilled in the art that various alternations and modifications can be apparently made
within the category of the technical spirit of the claims and are naturally belong to the
25 technical scope of the present invention.
16
Industrial Applicability
[0028]
The present invention can be appropriately applied to an agglomeration roller
5 compactor which compresses a raw material made by kneading, for example, a fine
powder and a binder to be molded into a plate shape.
Reference Signs List
10
[0029]
1 agglomeration roller compactor (roll-molding machine)
2 stationary roll
3 movable roll
4 molding rolls
5 gap
15 8 hopper
9 raw material
10-- molded product-__
11 casing
12 push-in screw device
20 12a, 12dpush-in screw on outside (outside screw)
12b, 12cpush-in screw at center (center screw)
13 rotary drive shaft
14 (14a, 14b, 14c, 14d) screw blade
15 driving unit (driving mechanism)
25 16 supply opening
17
22 transferring blade (first transferring blade, second transferring blade)
23 consolidation blade (first consolidation blade)
24 push-in blade (first push-in blade, second push-in blade)
18

CLAIMS
1. A push-in screw device comprising:
a plurality of push-in screws which are disposed in a hopper and pump a raw
5 material charged from an upper portion of the hopper to a lower side of the hopper; and
a driving mechanism which rotates the push-in screws,
wherein each of the push-in screws has a rotary drive shaft extending along a
vertical direction and a screw blade formed in a helical shape around the rotary drive
shaft, and wherein;
10 the push-in screws are arranged so that the respective rotary drive shafts are
lined up along the same straight line in a plan view;
positions of lower ends in the vertical direction of the screw blades are the same
and winding directions of the helical shapes of the adjacent screw blades are reversed;
and
15 when the two push-in screws at the center in the lined-up direction among the
push-in screws are referred to as center screws, and a part between the rotary drive shafts
--of-the center screws-ate seen in-plan-iew; a rotatronardirectio of each of the screw --
blades is coincident with a supply direction of the raw material.
20 2. The push-in screw device according to claim 1,
wherein the screw blade of each of the center screws includes, from above to
below in the vertical direction:
a first transferring blade which has a first inclination angle in a longitudinal
cross-sectional view and sends the raw material downward in the vertical direction;
25 a first consolidation blade which has a second inclination angle that is smaller
19
than the first inclination angle in the longitudinal cross-sectional view, and removes a gas
contained in the raw material sent from the first transferring blade; and
a first push-in blade which has a third inclination angle that is smaller than the
second inclination angle in the longitudinal cross-sectional view, and pumps the raw
5 material sent from the first consolidation blade downward.
3. The push-in screw device according to claim 2,
wherein, in a case where the two push-in screws at both side ends in the lined-up
direction among the push-in screws are referred to as outside screws, the screw blade of
10 each of the outside screws includes, from above to below in the vertical direction:
a second transferring blade which has a fourth inclination angle in the
longitudinal cross-sectional view and sends the raw material downward in the vertical
direction; and
a second push-in blade which has a fifth inclination angle that is smaller than the
15 fourth inclination angle in the longitudinal cross-sectional view and pumps the raw
material directly sent from the second transferring blade downward.
4. The push-in screw device according to claim 3,
wherein the second transferring blade is mounted to the rotary drive shaft so that
20 a lower end of the second transferring blade is positioned at a position shifted to an upper
side by 90° in a rotational direction of the rotary drive shaft from an upper end of the
second push-in blade.
5. The push-in screw device according to claim 3,
25 wherein a height of an upper end of the screw blade of each of the outside
20
screws is lower than a height of an upper end of the screw blade of each of the center
screws.
6. A roll-molding machine comprising:
5 a hopper which has a casing that stores a raw material, and a push-in screw
device that pushes out the raw material in the casing to a lower side of the casing; and
a pair of a stationary roll and a movable roll, which interpose the raw material
pushed out of the hopper therebetween to be compression molded,
wherein the push-in screw device is the push-in screw device according to any
10 one of claims 1 to 5, and
a lined-up direction of each of the push-in screws overlaps an extension
direction of a gap between the stationary roll and the movable roll in a plan view.