Field of the Invention
This invention relates to a continuous coal miner and in particular, this invention relates to a continuous coal miner in which Flexible coupling is adopted between the cutting motor and reducer, which reduces the effective load shock in case of change of coal rock hardness and extends the service life of the reducer. More particularly, this present invention relates to a continuous coal miner having the internally equipped forced cooling and lubrication pump units inside the cutting speed reducer that can realize effective cooling of lubricating oil and lubrication of gears and bearings. This present invention also relates to a continuous coal miner in which the scraper conveyor is directly driven by a low-speed high-torque hydraulic motor, and its scraper chain uses a karting chain which can swing in all directions and facilitates subsequent reception of loads by supporting equipment. Furthermore, this invention also relates to a continuous coal miner which has the beneficial effects of having compact structure, to reduce the power consumption and support carrying, low centre of gravity, good stability and having safety and reliability.
Background of the invention and the related Prior Art
The heretofore conventional continuous miner having coal-gathering arms at the front at each side of an intervening conveyor, the arm is pivotallyjournaled on a bearing fixed to and rotatable with a wheel, and is pivoted to a link that is in turn pivoted to a platform. Upon rotation of the wheel, the bearing rotates with the wheel and moves the arm in a substantially circular path toward and away from the conveyor so that the arm pushes the coal inwardly onto the conveyor. This assembly utilizes expensive and wearable bearings and seals that must be periodically replaced, and thereby results in frequent shut-downs in the use of the miner.

In other prior units, rotatable wheels with projecting bars at opposite sides of a conveyor for gathering coal and loading the coal onto the conveyor, have been used. Because of the structural arrangement of these projecting bars, the delivery of coal onto the conveyor is highly inefficient.
The other document CN103032420 discloses a built-in water-cooling and dust-removing device for a fuel tank of a road-header, wherein a snakelike copper tube cooler is internally installed in the fuel tank to cool hydraulic oil; a water inlet of the snakelike copper tube cooler is connected with a water pressure safety valve through a high-pressure hinge joint and a rubber tube to adjust the water inlet pressure; a water outlet of the snakelike copper tube cooler is connected with a first connector of a ball valve through another high-pressure hinge joint and another rubber tube; a second connector of the ball valve is connected with a water spray bracket through another rubber tube. According to the built-in water-cooling and dust-suppressing mechanism for the fuel tank of the continuous miner, the snakelike copper tube cooler is internally installed in the fuel tank, so that the hydraulic oil is directly and efficiently cooled, defects of the cooling method of a traditional external plate-fin type cooler are effectively overcame, and the cooling is rapid; and the used cooling water is used for suppressing dust when the continuous miner is in the cutting process, so that the hydraulic oil can be continuously cooled during two time periods of cutting work and cutting-free work, and the cooling water is also recycled effectively.
According to the document CN203835388 the technical field of equipment for coal mines and in particular relates to a cantilever type longitudinal axis double-cutting part continuous miner. The cantilever type longitudinal axis double-cutting part continuous miner comprises a rack body, left and right walking parts, a back support body, a scraper

conveyer, a loading mechanism, an electric control system, a hydraulic system, a cooling, spraying and dust settling system, two cantilever type longitudinal axis cutting parts and a revolving body, wherein the two cantilever type longitudinal axis cutting parts are articulated to the revolving body respectively by virtue of a horizontal supporting hinge shaft, the revolving body is arranged on a vertical articulated shaft of the rack body, the two cantilever type longitudinal axis cutting parts are arranged in parallel side by side or from top to bottom, and the revolving body and the rack body are articulated to a revolving hydraulic oil cylinder respectively by virtue of a vertical articulated shaft. The cantilever type longitudinal axis double-cutting part continuous miner can be suitable for tunneling construction of a coal road with a large section. With the adoption of the cantilever type longitudinal axis double-cutting part continuous miner, the whole section can be cut by virtue of once machine body location, tunneling and bolting parallel operation construction is convenient to be implemented by using airborne supporting equipment, the cutting time is shortened, and the construction efficiency is improved.
The document CN204025186 describes an integrated oil tank of a continuous miner. The integrated oil tank of the continuous miner comprises a first oil tank, a second oil tank and a third oil tank, and the first oil tank, the second oil tank and the third oil tank are arranged on a main machine frame. The lower portion of the first oil tank is provided with a first hose connector, and the first hose connector is communicated with the first oil tank. The lower portion of the second oil tank is provided with a second hose connector, and the second hose connector is communicated with the second oil tank. The first hose connector and the second hose connector are connected through a pipe, and then the first oil tank can be connected with the second oil tank in series. The third oil tank is communicated with the second oil tank through a connection pipe. The integrated oil tank is integrated on the main machine frame, an original large oil tank is divided into three independent small oil tanks, so

the structural strength and stability of the main machine frame are improved, and the space is saved.
According to the invention CN103485775 a novel continuous coal miner which comprises a cutting part, a shovel plate part, a main body part, a scraper conveyer, a rear support, a traveling part, a hydraulic system and an electric system, wherein the main body part is provided with a rotary table and a rotary oil cylinder; the rotary table is installed on the main body part through a rotary bearing, and an acting point of the rotary oil cylinder is located on the main body part while the other acting point is hinged to the side wall of the rotary table by a pin roll; the cutting part is hinged with the rotary table through a pin roll, and one acting point of a lifting oil cylinder is hinged with the cutting part by a pin roll while the other acting point is hinged with the rotary table by a pin roll;; extension oil cylinders are arranged on both sides on the upper part of a cutting motor box body, the motor is pushed by piston rods of the extension oil cylinder to slide in the cutting motor box body, and the cutting motor box body pushes a speed reducer and cutting heads to extend. The speed reducer is in a single-input and double-output structure, the input end of the speed reducer is in butt joint with the output end of the cutting motor, and the two output ends are located on both sides of the speed reducer to drive the cutting heads on the left and right sides, respectively.
The invention discloses a cutting speed reducer and a cutting portion of a continuous miner and the continuous miner, wherein the cutting speed reducer comprises a box body, a gear assembly and a power output shaft. The power input end of the box body is used for enabling cutting motors of the continuous miner to be transversely placed, the power output end of the box body is provided with the power output shaft used for being connected with cutting rollers of the continuous miner, and the gear assembly is arranged between the

power output end of the box body and the power output shaft and used for transmitting power. Therefore, the inner structure of the cutting portion can be simplified, and longitudinal space can be saved which has been stated in document of patent application CN103398145.
The document CN203173334 states a scraper conveyer of a continuous miner. The scraper conveyer of the continuous miner comprises an explosion-proof motor, a speed reducer, a chain wheel component, a scraper chain, a tension cylinder, a driving frame, a front chute and a rear chute. The scraper conveyer of the continuous miner is characterized in that a hinge assembly which can swing left and right is arranged on the joint part of the front chute and the rear chute, the explosion-proof motor is placed on the tail portion of the rear chute, the explosion-proof motor, the speed reducer and the chain wheel component are all installed on the driving frame, the explosion-proof motor drives the chain wheel component through the speed reducer, and the chain wheel component drives the scraper chain.
The invention stated in CN203050714 discloses a conveying and dust-removing device of an outdoor continuous miner. The conveying and dust-removing device of the outdoor continuous miner comprises a scraper conveyer protecting cover and a belt conveyer protecting cover, wherein the tail end of the scraper conveyer protecting cover is connected with an elbow; the other end of the elbow is connected with an inclined tube; the inclined tube is connected with the belt conveyer protecting cover through a three-way protecting cover; a tail cover is connected to the tail end of the belt conveyer protecting cover; and a spraying device is arranged on the tail cover. According to the conveying and dust-removing device, the protecting cover, the inclined tube and the spraying device are added on the basis of the traditional conveying and dust-removing device of the outdoor

continuous miner; on one hand, the dust generated when the coal drops into a transport cart in the conveying process of the outdoor continuous miner is reduced, so as to reduce the damage to the environment and harm to body health of workers; and on the other hand, the impact force in the process of transferring the coal to the belt conveyer is reduced; and the service life of the belt conveyer is prolonged.
The other document US4231468 provides a coal-gathering assembly for a continuous miner in which a platform is disposed behind a rotatable cutter, and a coal-transporting conveyor is located adjacent the platform for delivering coal rearwardly of the miner. The assembly includes a base plate rotatively mounted on the platform on each side of the coal-transporting conveyor. A plurality of bars are carried by each base plate, each bar extending across its associated base plate intermediate the rotative axis of the base plate and the base plate periphery. Each bar has one end adjacent the next angularly adjacent bar and has the other end extending beyond the base plate periphery. Each angularly adjacent pair of bars provide a substantially inwardly closed pocket. More particularly, each bar extends across the base place and is spaced from and intermediate the rotative axis and the base plate periphery, and extends substantially transverse to a radial line passed through the rotative axis and intermediate the ends of the bar. Each bar includes a leading edge facing in the direction of base plate rotation and extending substantially between its ends, and includes a trailing edge facing in the opposite direction and extending outwardly from the leading edge of the next angularly adjacent bar. The leading edge of each bar pushes the coal outwardly onto the conveyor as the associated base plate rotates.
The other document 1110/KOL/2006 states that the method for continuous miner from underground coal comprising of the following steps. First step - A layout is chalked out on the surface of the land with a demarcated boundary line beneath which the

extraction of coal is to be carried out. This is popularly known as panel. Second step - A planning is made out for ingress way for man and material approach, internal passage, ventilation, drainage, exit, transportation for coal outlet of the panel maintaining the norms of coal and mining rule 1957 and progress digging gradually as per sanctioned plan. Third step - On progress by gradual digging a driving gallery of size 4.8m x200m and 2.4m height is prepared besides a passage from bottom to top in a compartment space of size 100mx 200m (centre to centre). Fourth step - Coal is taken out from bottom of the gallery and when all coals are taken out from last top step layer of the gallery in one compartment then proceeded to a next adjacent similar compartment having same size leaving a space apart which acts as a pillar to support the upper layer which is popularly known as strata control. Fifth step - Further proceed by digging of similar size gallery in next adjacent second compartment of similar size from top to downward direction and started stowing sand in the first compartment simultaneously. Stowing is usually employed where the entire voids created by the extraction of coal and that is to be completely and solidly stowed. Stowing material (sand) is transported form out side the mine and filled in the extracted area under high hydranlic pressure. The object of stowing is for prevention the surface subsidence. Sixth step - proceed further, the digging of a third similar compartment adjacent of second compartment from bottom to upward direction to form similar size gallery leaving a space apart for second pillar and simultaneously stowing sand in the second compartment. Seventh step - Proceed the digging of such compartment wise along diagonally of the panel and simultaneous stowing sand in the previous vacant compartment.
While in its preferred form the present invention contemplates the provision of a continuous mining machine embodying all of the preferred features described above, a further object of the present invention is to provide a machine which combines less than all of the features in a manner heretofore not suggested in the prior art.

Summary of the invention
This invention relates to a continuous coal miner and in particular, this invention relates to a continuous coal miner in which Flexible coupling is adopted between the cutting motor and reducer, which reduces the effective load shock in case of change of coal rock hardness and extends the service life of the reducer. More particularly, this present invention relates to a continuous coal miner having the internally equipped forced cooling and lubrication pump units inside the cutting speed reducer that can realize effective cooling of lubricating oil and lubrication of gears and bearings. This present invention also relates to a continuous coal miner in which the scraper conveyor is directly driven by a low-speed high-torque hydraulic motor, and its scraper chain uses a karting chain which can swing in multi directions and facilitates subsequent reception of loads by supporting equipment. Furthermore, this invention also relates to a continuous coal miner which has the beneficial effects of having compact structure, to reduce the power consumption and low centre of gravity, good stability and having safety and reliability.
Detailed description of the invention with accompanying drawings
For the purpose of facilitating an understanding of the invention, there is illustrated in the accompanying drawings a preferred embodiment thereof, from an inspection of which, when considered in connection with the following description, the invention, its construction and operation, and many of its advantages should be readily understood and appreciated. The drawings are in six sheets.
The continuous miner is a comprehensive heading and mining equipment that integrates cutting, traveling, spray dust-prevention and many other functions. It is mainly

used in rapid heading of coal-mining preparation roadway, room and pillar mining and recycling of boundary coal. Its maximum positioning cutting section is 20 m2 and the maximum cutting rigidity is 80 MPa. Also, it applies to the grade of ±18°.
The principal object of the invention is to provide a continuous coal miner in which Flexible coupling is adopted between the cutting motor and reducer, which reduces the effective load shock in case of change of coal rock hardness and extends the service life of the reducer.
The other embodiment of the invention is to provide a continuous coal miner having the internally equipped forced cooling and lubrication pump units inside the cutting speed reducer that can realize effective cooling of lubricating oil and lubrication of gears and bearings.
The principal object of the invention is to a continuous coal miner in which the scraper conveyor is directly driven by a low-speed high-torque hydraulic motor, and its scraper chain uses a karting chain which can swing in all directions and facilitates subsequent reception of loads by supporting equipment.
The other embodiment of the invention is to provide a continuous coal miner which has the beneficial effects of having compact structure, to reduce the power consumption and low centre of gravity, good stability and having safety and reliability.
Still another object of the present invention is to provide a continuous coal miner which consists off (a) ramp plate unit, (b) scraper conveyor, (c) body part, (d) travel unit, (e) rear supporting unit, (f) hydrulic system, (g) water system, (h) lubrication system, (i) cutting unit.

The other embodiment of the invention is to provide the continuous coal miner in which the cost is low, the labor intensity is low.
The other embodiment of the invention is to provide the continuous coal miner with the structure adopts hydraulic transmission and is free of mechanical transmission noise, convenient, comfortable and labor-saving to use, compact and attractive in structure, convenient to maintain, wide in application range, fine in prospect and high in practicability.
The novel features that are considered characteristic of the present invention are set forth with particularity in the appended claims. The invention itself, however, both as to its organization and its method of operation, together with additional objects and advantages thereof, will best be understood from the following description of certain specific embodiments, when read in connection with the accompanying drawings, in which:
FIG. 1 illustrates the ramp plate unit of the continuous coal miner of the present
invention; FIG. 2 illustrates the star wheel drive device of the continuous coal miner of the
present invention; FIG. 3 illustrates the scraper conveyor of the continuous coal miner of the present
invention; FIG.4 illustrates the tension compensation device of the continuous coal miner of the
present invention; FIG. 5 illustrates the body part of the continuous coal miner of the present invention; FIG.6 illustrates the travel unit of the continuous coal miner of the present
invention; FIG.7 illustrates the constructional features of the continuous coal miner of the
present invention;

FIG.8 illustrates the cutting unit of the continuous coal miner of the present
invention; FIG.9 illustrates the cutting telescopic unit of the continuous coal miner of the
present invention; FIG. 10 illustrates the cutting speed reducer unit of the continuous coal miner of the
present invention;
The mechanical part of the machine mainly consists of travel unit, cutting unit and loading unit: the travel unit realizes the movement of continuous miner, the cutting unit realizes the cutting of coal rock and the loading unit realizes the loading and transport of cutting materials.
The main execution system of the machine consists of the electrical system and hydraulic system and the power source is provided by the 1140V AC power to provide power for the pump motor and cutting motor. The electrical system consists of electric cabinet, operation box and all electrical circuits to control the respective electrical parts. While the hydraulic system mainly consists of the hydraulic pump station, hydraulic pump motor, hydraulic circuit and hydraulic operating system, where the hydraulic pump station is driven by the pump motor to provide power and implement control for the travel unit and all cylinders through the hydraulic system.
During working of the machine, firstly start the pump motor and open the water system; then open the scraper conveyor and ramp plate unit; place the cutting unit horizontally and put it in the center of the machine; start the cutting motor and then to open the ramp plate and rear support; operate the telescopic cylinder slowly to gradually insert the cutting Boom into the coal rock, and the cutting depth shall be based on the actual coal rock rigidity.

Push the operating handle of rotary cylinder of the cutting unit to make it swing horizontally until reaching the limit position and then push the lifting cylinder to make the cutting unit cut upward. The movement of cutting head in all directions can cut a preliminary section shape and then redress the section to meet the requirement of section size.
The ramp plate unit (Fig. 1) consists of the ramp plate frame body, driving device, driven wheel device, left/right star wheel and other parts. The left/right star wheel is directly driven by a motor. Its mirror surface adopts a two-way large dip angle, which is easy to feed and clean. This mechanism enjoys such features as smooth operation, continuous transportation of coal, reliable working, and low accident rate, etc.
The ramp plate is installed at the front end of machine and hinged to the main frame through a pair of pin shafts. Under the action of ramp plate cylinder, the ramp plate can swing upward and downward around the pin shaft by rising upward 465 mm and dinting downward 285 mm. When the machine cuts the coal rock, the front end of ramp plate should stick close to the bottom plate, so as to increase the cutting stability of machine.
The scraper conveyer (Figure 3) is in the central axis of machine and consists of front chute, rear chute, middle pin shaft, swing cylinder, scraper chain, tensioning compensation device and other parts. The scraper conveyor is directly driven by a low-speed high-torque hydraulic motor, and its scraper chain uses a karting chain which can swings in all directions.
The scraper chain adopts a hydraulic oil cylinder for automatic tensioning to ensure that it can operate properly under constant tension to prevent chains from stacking or

sticking and is easy to maintain. The horizontal swing angle of rear chute is ±40°, range of discharge height is 1300-2000 mm, scraper space is 330 mm, and width is 560 mm.
The tensioning device (Fig.4) mainly consists of cylinder, spring, chain wheel set, and driving frame. It is used to compensate the tension generated during tail swinging of the conveyor. The tensioning cylinder is a double acting cylinder with simple structure, low fault rate and smooth tail swinging. Its spring can respond quickly to firstly compensate the tension.
The body part (Fig. 5) is in the centre of the machine and mainly consists of body frame, body rear part, rotary table, rotary support, rotary cylinder and other parts. This part is the backbone of Miner. To facilitate descending to the shaft, the body part, is separated into front and rear rack parts, which are connected together by the pin shafts and bolts. It bears the concentrated load from cutting, traveling, loading, and cylinders of all parts. All parts of the machine are connected with the body part by bolts and pin shafts.
The upper lughole of rotary table is connected with the cutting unit and the lower lughole is connected with the cutting lifting cylinder. Both the rotary cylinder and lifting cylinder are used to control the swing in all direction of cutting unit. The front lughole of body frame is connected with the ramp plate and its cylinder which is used to control the rising and dinting of ramp plate. There is a pump station for the hydraulic system on the right side of the body part, an electrical system on the left side, a scraper conveyor inside, a travel unit on both left and right sides and a back support on the rear part.
The travel unit (Fig.6) plays a role of supporting the traveling, mobilizing and working of complete machine as well as bearing the weight of the complete machine. It

includes left and right parts which are of same structure and connect with the main frame by 24 high-strength bolts (M30,10.9 grade). The travel reducer is driven by the hydraulic motor, and the travel frame is supported by a compound structure of supporting wheel and friction plate.
This unit mainly consists of guide tensioning device, left/right track frame, track shoe, supporting wheel, travel speed reducer, hydraulic motor and other parts. The track is tensioned by cylinder. After tensioning the track, load the card board and lock plate and discharge the pressure inside the cylinder before tightening the nozzle, so as to ensure the piston rod of tensioning device doesn't bear any tensioning force.
The rear supporting unit is used to support the complete machine during maintenance. Also, when cutting the hard coal rocks, the rear supporting unit can be opened to reduce the vibration of machine. This unit adopts integrated cast structure and realizes lifting of rear supporting unit through the rear supporting cylinder in the center to ensure the stability and reliability of the complete machine.
The hydraulic system consists of the hydraulic cylinder, main pump, multi-way valve, hydraulic motor, cylinder, cooler, all rubber hose assembly, joints, seals, pressure gauge and other parts. Functions of hydraulic system is as follows:
1. The volume of hydraulic cylinder is 600 L. It is equipped with air filter, liquid level transmitter, temperature transmitter, oil return transmitter and other hydraulic accessories.
2. The travel motor adopts A6VE axial piston variable motor to realize high/ low-speed traveling of complete machine.

3. The driving cylinder is used to realize movement and stretching in all directions.
4. The star wheel motor is driven by the pressure oil to drive the star wheel to rotate and load materials.
5. The first conveyor motor is driven by the pressure oil to drive the first conveyor to rotate and transport materials.
6. The driving cylinder can also realize the lifting of ramp plate and rear supporting leg.
7. The system can complete the automatic tensioning of first conveyor scraper chain and tensioning of track.
8. The main pump adopts original imported variable swash-plate piston dual pumps to provide hydraulic oil source for the main oil line and control oil line.
9. The main valve is in the operation box to control the action of all actuating mechanisms.
The pump station is driven by a 110 kW motor and transports the pressure oil to the hydraulic motors and cylinders of the cutting unit, ramp plate unit, scraper conveyor, travel unit, and rear supporting unit through the oil pump. The main machine is equipped with 13 main cylinders, which are all equipped with safety balancing valves. During no-load operation of the hydraulic system, the shaft end bearing of hydraulic pump can reach a temperature of 55-80°C owing to friction, which is a normal phenomenon.
The operation box is equipped with quintuplet and septuplet manual/electric multi-way changeover valve and the action of all cylinders and hydraulic motors are completed by the remote control. If the remote control breaks down, the action can also be

completed by the handle equipped with machine. There are two pressure gauges on the operation box used to display the pressure of the front pump and rear pump. A complete set of branded remote control and valve set is adopted, which are of beautiful appearance, comfortable operation, reliable performance and easy to install and maintain.
To prevent the damage of cylinder caused by overload, all cylinders are equipped with the safety balancing valves.
The water system consists of the external spraying device, which is installed in the cutting unit. The external water of the water system is separated into two branches after passing the backwash filter, ball valve and cooler: the first branch is to pass the cylinder motor and cool it; the second branch is to pass the cutting motor and converge with the water passing after the cylinder in the oil cooler, and then spray out through the spray block in the cutting unit.
This miner (Fig.7) consists of cutting unit, ramp plate unit, body part, travel unit, back support, scraper conveyer, water system, lubrication system, hydraulic system and electrical system.
The cutting unit (Fig.8) is the core mechanism of roadheader and mainly consists of left/right cutting head, cutting motor box, telescopic cylinder, cutting speed reducer, cutting motor and other parts.
It is hinged with the rotary table of machine body through the pin shafts on both ends and realizes up and down, left and right, and telescopic reciprocating movement through the telescopic cylinder. The cutting head adopts cone shaped structural design with the

diameter of 1000 mm and dinting depth of 250 mm. The whole cutting head is designed and manufactured by a foreign well-known manufacturer; all cutting picks are properly selected and arranged to provide strong rock breaking ability; and the cutting head transmits power through the spline shafts on both ends of cutting speed reducer and connects with the spline shafts by using the M24 high-strength bolts.
The cutting telescopic unit (Fig.9) mainly consists of the connecting base, drag chain, cutting motor box, telescopic cylinder, cutting motor and other parts. The telescopic stroke of cutting telescopic unit is 500 mm. The working principle of this mechanism is: the back connecting base of the telescopic mechanism is hinged with the rotary table of the machine body and the front connecting base is connected with the cutting speed reducer; as the connecting base is connected with the cutting motor through bolts, when the miner stretches, the connecting base is pushed through the telescopic cylinder, which also drive the telescop¬ing of cutting motor; during the telescoping process of cutting motor, it steers the direction through two feather keys fixed in the cutting motor box. Also, one end of the drag chain is fixed to the cutting motor box to serve as the fixed end, and the other end is connected to and moves together with the cutting motor. The drag chain is used to store the cables, hydraulic hoses, water hoses and other pipelines during telescoping. In addition, there is a spraying device arranged on the connecting base, which can cover the whole cutting head through the water spray and effectively suppress the dust generated during cutting.
These are the following features of cutting speed reducer (Fig. 10):
(a) A reasonable design scheme is adopted to ensure the transmission ratio of speed reducer meet the requirements and minimize the size and weight.
(b) A forced lubrication and cooling system is adopted to lubricate and cool the

gears and bearings at all levels under all working conditions of speed reducer.
(c) Choose high-quality seals to fully isolate the gear lubricating oil and dust of input shaft and output shaft areas.
(d) Adopt hi-tech speed reducer vent plug to prevent the gear lubricating oil from being polluted by the dust through the vent plug.
(e) Use special wear-resistant materials to fully protect the shell of speed reducer.
(f) Choose a reliable lifting position to facilitate the installation and maintenance of speed reducer.
Parameters of cutting speed reducer:

Without further elaboration, the foregoing will so fully illustrate my invention, that others may, by applying current of future knowledge, readily adapt the same for use under various conditions of service. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the invention.
Advantages over the prior art
The continuous coal miner proposed by the present invention has the following

advantages over the prior art:
(a) It is cost effective as compared to others machine available in the market.
(b) This has low centre of gravity and good stability.
(c) It has the characteristics of simple structure, convenient use, high efficiency.
(d) It is economical in maintenances.
(e) The continuous coal miner are suitable for the rapid heading of a coal-mining preparation roadway at thin seams, as well as room and pillar mining and recycling of boundary coal.
(f) For the mines where the coal evaluation in slow in nature but ready for mechanization over conventional practices; this machine in an obvious choice.
In the preceding specification, the invention has been described with reference to specific exemplary embodiments thereof. It will be evident that various modifications and changes may be made thereunto without departing from the broader spirit and scope of the invention as set forth in the claims that follow. The specification and drawings are accordingly to be regarded in an illustrative rather than restrictive sense. Therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of the invention. The matter set forth in the foregoing description and accompanying drawings is offered by way of illustration only and not as a limitation. The actual scope of the invention is intended to be defined in the following claims when viewed in their proper perspective based on the prior art.

We claim :
1. A continuous coal miner which consists off:
(a) ramp plate unit, (b) scraper conveyor, (c) body part, (d) travel unit, (e) rear supporting unit, (f) hydrulic system, (g) water system, (h) lubrication system, (i) cutting unit.
2. The continuous coal miner as claimed in Claim 1 in which Flexible coupling is adopted between the cutting motor and reducer, which reduces the effective load shock in case of change of coal rock hardness and extends the service life of the reducer.
3. The continuous coal miner as claimed in Claim 1 in which the internally equipped forced cooling and lubrication pump units inside the cutting speed reducer that can realize effective cooling of lubricating oil and lubrication of gears and bearings.
4. The continuous coal miner as claimed in Claim 1 in which the scraper conveyor is directly driven by a low-speed high-torque hydraulic motor, and its scraper chain uses a karting chain which can swing in multi directions and facilitates subsequent reception of loads by supporting equipment.
5. The continuous coal miner as claimed in Claim 1 in which the scraper chain adopts a hydraulic oil cylinder for automatic tensioning to ensure that it can operate properly under constant tension to prevent chains from stacking or sticking.
6. The continuous coal miner as claimed in Claim 1 in which a load-sensitive

control system is used for the hydraulic system, which improves its efficiency and reduces heat to achieve the Compound action by multiple actuators.
7. The continuous coal miner as claimed in Claim 1 in which the telescopic cutting unit is adopted to reach an extension of 500 mm and realize flexible mobilization of machine and flat cutting roadway section with an inbuilt dust suppression system.
8. The continuous coal miner as claimed in Claim 1 in which uunder the action of ramp plate cylinder, the ramp plate can swing upward and downward around the pin shaft by rising upward 465 mm and dinting downward 285 mm.
9. The continuous coal miner as claimed in Claim 1 in which the horizontal swing angle of rear chute is ±40°, range of discharge height is 1300~2000 mm, scraper space is 330 mm, and width is 560 mm.
10. The continuous coal miner as claimed in Claim 1 in which tensioning device mainly consists of cylinder, spring, chain wheel set and driving frame.