CN111411952A - Thin coal seam coal mining machine - Google Patents

Abstract

The invention relates to a thin coal seam coal mining machine, which comprises a cutting system and a traction system, wherein the cutting system comprises a non-swing transmission part and a motor-free rocker arm, the non-swing transmission part comprises a standing shell and a front-stage transmission system, the motor-free rocker arm comprises a rocker arm shell and a rear-stage transmission system, a cutting motor is arranged in the standing shell, the root of the rocker arm shell is rotatably supported in the standing shell, an output shaft of the cutting motor is connected with the rear-stage transmission system through the front-stage transmission system, the traction system comprises a traction shell, the traction shell is L-shaped, the traction shell is divided into a front extension section, a rear extension section and a left extension section, the traction motor and a high-speed section speed reduction mechanism are arranged in the front extension section and the rear extension section, the middle section speed reduction mechanism is arranged in the left extension section and the right extension section, and the front extension section and the rear extension section are attached to the left and the.

Description

Thin coal seam coal mining machine

Technical Field

The invention relates to a thin coal seam coal mining machine, which is particularly suitable for mining thin or extremely thin coal seams of working faces with complex conditions such as low mining height, high coal rock hardness and the like.

Background

For mining of thin or extremely thin coal seams, the mining height is often low (some mining heights meet the requirement of 0.8m), the geological conditions are complex (such as coexistence of coal and rock and high hardness), and the like, so in order to improve the adaptability and reliability of the coal mining machine, the thin coal seam coal mining machine is generally required to have a shorter and shorter machine body, and the installed power is higher and higher. However, as power increases, the size of the motor, the transmission system and the like generally increases correspondingly, which is in conflict with the achievement of lower machine surface height. The structural arrangement of thin or ultra-thin seam shearers is therefore a major and difficult point in the structural design of such shearers.

When a thin coal seam is mined, the space of a coal mining face is usually narrow, if the overall dimension of the coal mining machine is too large, the peripheral space of the coal mining machine is compressed, for example, the machine clearance is passed and the coal passing height is reduced, and the passing and loading of the coal mining machine can be seriously influenced, so that the problem of difficult structural arrangement of the coal mining machine for the thin or extremely thin coal seam is more prominent due to the increase of the installed power.

The technical proposal that large and medium-sized parts such as motors, transmission gears and the like are moved forwards from the upper part of the original scraper conveyor to the side close to the coal wall is proposed and gradually used in the industry, namely, the arrangement problem of the large and medium-sized parts is solved by adopting a mode of suspending a machine body. Although the method can improve the structural arrangement problem to a certain extent, such as the increase of the machine clearance, the method also brings other outstanding problems, including the partial higher structure of the coal mining machine on the side close to the coal wall; the span distance between the left roller and the right roller is large; the drum has poor adaptability to mining height, for example, large and medium-sized parts such as a cutting motor of a cutting system need to swing upwards along with a rocker arm, and particularly under the condition of a rear drum top mining cutter, because a rocker arm shell is easily scratched and interfered with an upper coal platform, the up-regulation amount of the rear drum is greatly reduced, higher coal cannot be further mined, or even if the theoretical top regulation amount is large, the mining requirement of a coal bed in a wider mining height range cannot be really met; the space above the scraper conveyor for passing coal is small, which causes poor adaptability of the coal mining machine to the fluctuating working surface and the like.

Disclosure of Invention

The invention aims to provide a thin coal seam coal mining machine, which can obtain larger machine loading power while realizing a short machine body, and has good adaptability and reliability in mining of complex working faces under the conditions of low mining height, high coal rock hardness and the like.

The main technical scheme of the invention is as follows:

the utility model provides a coal mining machine for thin coal seam, includes cutting system and traction system, cutting system includes non-swing drive division, no motor rocking arm, cutting motor and hydro-cylinder, non-swing drive division is including the casing of stewing and set up the preceding stage transmission system in the casing of stewing, no motor rocking arm includes the rocking arm casing and sets up the back level transmission system in the rocking arm casing, be equipped with motor installation cavity and rocking arm installation cavity in the casing of stewing, cutting motor fixed mounting be in the motor installation cavity, the root rotation of rocking arm casing is supported in the rocking arm installation cavity, the output shaft of cutting motor passes through preceding stage transmission system with back level transmission system links up, back level transmission system's input is equipped with gear wheel and planetary mechanism of coaxial coupling in proper order, gear wheel and planetary mechanism set up in the cavity of rocking arm casing's root, the axis of gear wheel with the center of rotation of rocking arm casing's root is coaxial, the both ends of hydro-cylinder respectively with rocking arm casing and the casing of stewing hinge, the axis of gear wheel and the articulated axis of hydro-cylinder both ends all extend along the front and back direction, traction system includes traction casing, high-speed reduction traction mechanism, the fixed traction mechanism extends the fixed section that the central section is connected with the fixed traction mechanism about the fixed traction mechanism that the high-speed reduction mechanism extends the central section is connected the central section 3583, the high-speed reduction mechanism extends the central section of high-speed traction mechanism extends the central section is connected the central section of high-speed traction mechanism is connected input end of high-speed traction mechanism and is connected the central section of high-speed traction mechanism is connected the central section of.

The utility model discloses a rocking arm casing, including rocking arm installation cavity, casing notch, pinion and intermediate gear, the casing notch is equipped with on the casing of stewing on the public lateral wall between rocking arm installation cavity and other adjacent cavities, be equipped with rocking arm casing breach on the root lateral wall of rocking arm casing, under the installation status, rocking arm casing breach in week always keep with the casing notch has partial overlap area, preceding stage transmission system's output adopts mutual external toothing's pinion and intermediate gear, the intermediate gear with the gear wheel is in the overlap area of casing notch and rocking arm casing breach keeps the external toothing.

The bearing seat is further fixed on the inner wall of the cavity at the root of the rocker arm shell, the position, close to the large gear, of the inner wall of the cavity is close to the inner wall of the cavity, the input shaft diameter of the large gear is supported on the inner wall of the bearing seat through a bearing, a bearing seat notch is formed in the side wall of the bearing seat, and the circumferential position and the size of the bearing seat notch are consistent with those of the rocker arm shell notch.

The oil cylinder is characterized in that a guard plate is installed on the standing shell, the rocker arm shell and the guard plate jointly enclose a closed cavity, and the oil cylinder is located in the closed cavity.

The rear space of the fore-stage transmission system in the standing shell is preferably set into an oil tank, a hydraulic system for providing hydraulic driving force for the oil cylinder is installed in the oil tank, and a transmission shaft in the fore-stage transmission system replaces a pump motor of the hydraulic system to provide power for the hydraulic system.

The left and right extension sections only reserve necessary installation space and necessary fabrication holes of the intermediate gear assembly, and the rest parts are made into solid bodies.

The height of the left and right extension sections is smaller than that of the front and rear extension sections, the middle and rear sections of the top surfaces of the left and right extension sections are preferably set to be inclined planes with high front and low rear, and the middle and rear sections of the bottom surfaces of the left and right extension sections are preferably set to be concave surfaces with concave middle parts in the front and rear directions.

The thin seam coal mining machine further comprises a traveling system, the traveling system can comprise a traveling box shell, a driving wheel shaft, a traveling wheel group, a traveling wheel shaft and a guide sliding shoe, the traveling box shell is fixed on the outer wall of the rear side of the left and right extension sections of the traction shell, the front end of the driving wheel shaft is coaxially and fixedly connected with the output end of the middle section speed reducing mechanism, the driving wheel shaft passes through the traction shell and the traveling box shell backwards and is rotatably supported on the front and rear side walls of the traveling box shell, the driving wheel is coaxially fixed on the driving wheel shaft, the two ends of the traveling wheel shaft are respectively rotatably supported on the front and rear side walls of the traveling box shell, a connecting gear in the traveling wheel group is coaxially and fixedly connected with the traveling wheel, the traveling wheel is coaxially arranged on the traveling wheel shaft, and the connecting gear is externally meshed, the guide slipper comprises a base and an ear seat positioned above the base, the base comprises a front side wall, a rear side wall and a top plate connected between the front side wall and the rear side wall, the bottom of the front side wall or the rear side wall is provided with a barb, the left end and the right end of the base are respectively surrounded by the front side wall, the top plate, the rear side wall and the barb to form a guide groove extending left and right, the guide slipper is installed at the lower part of the walking box and is connected with the shell of the walking box in a swinging manner through an ear hole on the ear seat of the guide slipper, the axis of the walking wheel shaft is superposed with the central line of the ear hole, the guide slipper is provided with a left concave surface and a right concave surface which are respectively concave towards the inside of the base, the concave surfaces are positioned on at least one of the left side surface and the right side surface of the ear seat, the left top surface and the right top surface of the base separated by the ear seat, the drive axle is disposed radially adjacent to the recessed surface, and the drive axle is located between the ear mount and one of the guide grooves in the left-right direction.

The thin seam coal mining machine is further provided with a middle box, and the cutting system and the traction system are respectively provided with a left side and a right side which are respectively placed and fixed on the left side and the right side of the middle box.

The middle box comprises a front part and a middle rear part, the front top surface and the bottom surface are respectively the front top surface of the middle box and the front bottom surface of the middle box, the top surface of the middle rear part is divided into the middle top surface of the middle box and the rear top surface of the middle box from front to back, the bottom surface of the middle rear part is divided into the middle bottom surface of the middle box and the rear bottom surface of the middle box from front to back, the height of the middle rear part is smaller than that of the front part, the height of the middle top surface of the front part, the height of the middle bottom surface of the middle box is smaller than that of the middle rear top surface of the middle box, the height of the middle top surface of the middle box is smaller than that of the middle box, the middle rear bottom surface of the middle box is a.

The invention has the beneficial effects that:

the cutting system is provided with the swinging transmission part and the non-swinging transmission part, so that the swinging transmission part swings relative to the non-swinging transmission part in a fixed shaft mode, large and medium-sized parts such as the cutting motor, the planetary mechanism, the large gear and the like are placed in the shell of the non-swinging transmission part, and when the swinging transmission part rotates, the large and medium-sized parts are not changed in position, so that the front roller bottom mining cutter cuts a channel of the suspended machine body, the rear roller top mining cutter cuts a residual coal platform and cannot be influenced by the large and medium-sized parts, and the rocker arm shell cannot interfere with the coal platform, so that the arrangement mode of the suspended machine body is realized, the height of the machine body of the coal mining machine is reduced, and the due mining height range is ensured.

According to the invention, a branch is led out from the non-swing transmission part to replace a pump motor to provide power for the pump set of the hydraulic system, and the power of the cutting motor is far greater than that of the pump motor, so that even if the power requirement of the hydraulic system is larger, the hydraulic system does not need to occupy larger installation space due to the need of equipping a pump motor with larger power as in the traditional pump set, and therefore, the hydraulic system has a compact structure and is rich in power.

The invention fully utilizes the idle space in the standing shell of the non-swing transmission part as the oil tank of the hydraulic system, and the hydraulic system is installed by the idle space, so that the structure of the coal mining machine is more compact, the height of the machine surface is not increased, and the span of the roller is not increased.

The large and medium-sized traction motor and the high-speed section speed reducing mechanism of the traction system are arranged on the side close to the coal wall, so that the large and medium-sized traction motor and the high-speed section speed reducing mechanism are arranged in a space between the left and right rollers and below the front of the coal mining machine support, the middle-sized and small-sized section speed reducing mechanism is arranged above the scraper conveyor and below a thin beam at the front end of a top beam of the coal mining machine support, the height of a machine body is reduced, and meanwhile, sufficient effective gaps between a top plate, a bottom plate and the coal wall are ensured above and below a traction part between the rollers and in front of the coal wall.

The traction shell is set into L shape, one part of the traction shell is arranged above the scraper conveyor, the other part of the traction shell is arranged to overhang the coal wall side, and the occupation of the traction system to the space between the left roller and the right roller is further reduced.

According to the invention, the top surfaces of the middle rear parts of the traction shell and the middle box are set to be inclined planes with high front parts and low rear parts, and the bottom surfaces of the middle rear parts are set to be concave surfaces with concave parts in the middle parts in the front and rear directions, so that a sufficient safety distance is kept between the traction shell and the scraper conveyor and between the traction shell and the bracket of the coal mining machine, and the adaptability of the thin coal seam coal mining machine to the working surface under the fluctuating condition is improved.

According to the invention, by adopting the double-shaft structure walking system of the driving wheel shaft and the walking wheel shaft, the diameter of the driving wheel arranged on the driving wheel shaft is greatly reduced compared with that of the walking wheel arranged originally, and meanwhile, the concave surface arranged on the left side and/or the right side of the lug seat of the guide sliding shoe can enable the installation position of the driving wheel shaft to be closer to the walking wheel shaft, so that the fall of the driving wheel shaft and the walking wheel shaft in the height direction is reduced, therefore, under the condition that the machine face height of the machine body of the coal mining machine is unchanged, the coal passing height below the machine body and above the scraper conveyor can be greatly increased, and the problems of chain jamming of the scraper machine, increase of resistance of the coal mining machine, insufficient effective traction force and the like when the coal.

Drawings

FIG. 1 is a top view of one embodiment of the present invention;

FIG. 2 is a front view of one embodiment of the cutting system on the left;

FIG. 3 is a horizontal cross-sectional view of FIG. 2;

FIG. 4 is an enlarged view of the motorless rocker arm of FIG. 3;

FIG. 5 is a partial cross-sectional view of the rocker arm housing notch and bearing seat notch of FIG. 4;

FIG. 6 is a horizontal cross-sectional view of an embodiment of the traction system on the left;

FIG. 7 is a longitudinal cross-sectional view of the traction system shown in FIG. 6;

FIG. 8 is a front view of an embodiment of the walking system on the left;

FIG. 9 is a front view of the guide shoe of FIG. 8;

FIG. 10 is a cross-sectional view of the step A-A of FIG. 8;

FIG. 11 is a longitudinal cross-sectional view of one embodiment of the intermediate tank.

Reference numerals:

1. a cutting system; 11. a non-swing transmission part; 110. a cutting motor; 111. standing the shell; 1111. an oil tank; 113. a guard plate; 114. a hydraulic system; 1151. a pinion gear; 1152. an intermediate gear; 12. a motor-free rocker arm; 121. a rocker arm housing; 1211. a rocker arm housing gap; 1221. a bull gear; 1222. a planetary mechanism; 123. a bearing; 124. a bearing seat; 1241. a bearing seat notch; 13. an oil cylinder; 14. a drum;

2. a traction system; 20 a traction motor; 21. a traction housing; 22. a high-speed section reduction mechanism; 23. a middle section speed reducing mechanism; 231. a head end gear assembly; 232. an intermediate gear assembly; 233. a tip gear assembly; 241. a top surface of the front and rear extension sections; 242. a front section of the top surface of the left and right extension sections; 243. a middle rear section of the top surface of the left and right extension sections; 251. a bottom surface of the front and rear extension sections; 252. a front section of the bottom surface of the left and right extension sections; 253. a middle rear section of the bottom surface of the left and right extension sections;

3. a traveling system; 30. a walking box housing; 31. an integral drive wheel; 32. a traveling wheel set; 321. a connecting gear; 322. a traveling wheel; 323. a running wheel axle; 33. a guide shoe; 331. a base; 332. an ear mount; 333. a recessed surface;

4. an intermediate box; 411. a top surface of the front portion; 412. the middle top surface of the middle box; 413. a rear top surface of the intermediate box; 421. a bottom surface of the front portion; 422. the middle bottom surface of the middle box; 423. the rear bottom surface of the middle box;

5. a screw;

91. a support top beam; 911. a support thin beam; 912. supporting a thick beam;

92. a scraper conveyor;

93. a track.

Detailed Description

The invention discloses a thin coal seam mining machine, which comprises a cutting system 1 and a traction system 2, wherein the cutting system comprises a non-swing transmission part 11, a motor-free rocker arm 12, a cutting motor 110 and an oil cylinder 13, and is shown in figures 1-11. The non-oscillating drive section includes a stationary housing 111 and a forward drive system disposed within the stationary housing. The motorless rocker arm is equivalent to a swing transmission part and comprises a rocker arm shell 121 and a rear-stage transmission system arranged in the rocker arm shell. The static shell is internally provided with a motor installation cavity and a rocker arm installation cavity, the cutting motor is fixedly installed in the motor installation cavity, and the root of the cylindrical structure of the rocker arm shell is rotatably supported in the rocker arm installation cavity, so that the rocker arm shell can do fixed-axis swing relative to the static shell, wherein the root of the rocker arm shell only rotates in the static shell.

The output shaft of the cutting motor is connected with the rear-stage transmission system through the front-stage transmission system, namely, the power output by the cutting motor is transmitted to the roller 14 at the other end of the rocker arm shell through the front-stage transmission system and the rear-stage transmission system in sequence. The input end of the rear-stage transmission system is provided with a gearwheel 1221 and a planetary mechanism 1222 which are sequentially and coaxially connected, the gearwheel and the planetary mechanism are arranged in a cavity at the root of the rocker arm shell, and the axis of the gearwheel is coaxial with the rotation center at the root of the rocker arm shell. When the rocker arm swings in a fixed axis mode, the large gear 1221 and the planetary mechanism 1222 as large and medium-sized parts in a rear-stage transmission system are always in situ self-rotated in the standing shell, and the cutting motor as another large and medium-sized part is installed in the standing shell, so that the position of the cutting motor cannot be changed along with the swinging of the rocker arm, particularly the cutting motor does not have height change, a large space can be kept between the rocker arm shell and an upper coal platform, and the rocker arm shell cannot interfere with the coal platform and the like even when the rear rocker arm is used for mining a top cutter. Therefore, the invention can solve the problem of arrangement of large and medium-sized parts and can ensure that the theoretical mining height range is not shrunk. In addition, compared with the middle-small-size parts of the cutting system, the large-middle-size parts are closer to the coal wall side, and the height of the machine face of the coal mining machine is favorably reduced. A, B, C correspond to the arrangement areas of small-size parts, medium-small-size parts and large-medium-size parts of the thin coal seam mining machine respectively, wherein the arrangement areas of the large-medium-size parts are closer to the coal wall side, and the arrangement areas of the small-size parts and the medium-small-size parts are positioned below the bracket top beam 91 and above the scraper conveyor 92. Wherein, the area A corresponds to the position below the thick beam 912 of the bracket, and the area B corresponds to the position from the thin beam 911 of the bracket to the lower part of the rear edge of the roller.

And two ends of the oil cylinder are respectively hinged with the rocker arm shell and the standing shell. The axis of the bull gear and the hinge axis at the two ends of the oil cylinder extend along the front and back directions. The front and rear directions of the coal mining machine are respectively the directions from the inside of the coal mining machine to the coal wall side and the mining side of the coal mining machine. The oil cylinder stretches and retracts to drive the rocker arm to swing relative to the non-swing transmission part.

The traction system comprises a traction shell 21, a high-speed section speed reducing mechanism 22, a middle section speed reducing mechanism 23 and a traction motor 20, wherein the traction shell is L-shaped and comprises a front and back extension section and a left and right extension section, the traction motor and the high-speed section speed reducing mechanism are arranged in the front and back extension section, the middle section speed reducing mechanism is arranged in the left and right extension section, an output shaft of the traction motor is coaxially and fixedly connected with an input end of the high-speed section speed reducing mechanism, an output end of the high-speed section speed reducing mechanism is coaxially and fixedly connected with an input end of the middle section speed reducing mechanism, and an output end of the middle section speed reducing mechanism is closer to an end part, far away from the front and.

When the coal mining machine is a double-drum coal mining machine, a cutting system and a traction system are respectively arranged in a left-right set and are symmetrically arranged, when the coal mining machine is a single-drum coal mining machine, the cutting system and the traction system only have a left set or a right set, and when the three sets are matched, the left-right extension sections are arranged above the scraper conveyor 92 and below the support top beam 91.

The traction motor and the high-speed section speed reducing mechanism are large, medium and small parts, the middle section speed reducing mechanism is mainly made of medium and small parts, the traction motor and the high-speed section speed reducing mechanism are suspended on the side close to the coal wall, the middle section speed reducing mechanism is located in the area C, the middle section speed reducing mechanism is arranged above the scraper conveyor 92 and below the support top beam, the height of the machine body is reduced, and meanwhile, sufficient effective top plate, bottom plate and coal wall gaps are formed above and below the traction part between the rollers and in front of the coal wall.

The high-speed section speed reducing mechanism and the traction motor are axially arranged, so that the space occupation of a traction system in the left and right directions is reduced, the traction shell is set into an L shape, one part of the traction shell is arranged above the scraper conveyor, the other part of the traction shell is arranged to overhang the coal wall side, and the space occupation of the traction system between the left roller and the right roller is further reduced.

Regarding the cutting system, as shown in fig. 3, in the installation state, the opening of the rocker arm installation cavity faces backwards, the root barrel structure of the rocker arm shell is inserted into the rocker arm installation cavity from back to front, and is rotatably supported on the inner wall of the rocker arm installation cavity through the front and back two supporting and positioning bearings 123. In this embodiment, the front section and the rear section of the inner wall of the rocker arm mounting cavity are respectively a front positioning hole and a rear positioning hole, and are respectively used for mounting a front supporting positioning bearing and a rear supporting positioning bearing.

The rocker arm housing further includes a head portion and a neck portion between the head portion and the root portion, the rocker arm housing presenting a reentrant configuration with both the head portion and the root portion projecting forwardly relative to the neck portion. The large gear 1221, the planetary 1222 and the small and medium-sized fixed-axis gear transmission structure constitute the rear stage transmission system. The fixed shaft gear transmission structure is positioned in the cavities of the neck and the head. The roller 14 is mounted on the head of the rocker housing and rotates relative to the rocker housing.

Further, the output of the pre-stage transmission may employ a pinion 1151 and an intermediate gear 1152 that are in external engagement with each other, the intermediate gear being in external engagement with the bull gear. And a shell notch is formed in a public side wall between the rocker arm installation cavity and other cavities adjacent to the rocker arm installation cavity on the standing shell and is used for providing a space for the rotation of the intermediate gear. The side wall of the root part of the rocker arm shell is correspondingly provided with a rocker arm shell notch 1211, and in the installation state, the rocker arm shell notch 1211 always keeps a partial overlapping area with the shell notch in the circumferential direction, and the overlapping area is large enough to ensure that the intermediate gear and the large gear are kept meshed in the overlapping area of the shell notch and the rocker arm shell notch.

In this embodiment, a bearing seat 124 is further fixed on the inner wall of the chamber at the root of the rocker arm housing 121, the inner wall of the bearing seat 124 being close to the large gear, and the shaft diameter of the input end of the large gear is supported by a bearing. In this case, a bearing seat notch 1241 is also provided in the side wall of the bearing seat, and referring to fig. 5, the circumferential position and size of the bearing seat notch 1241 preferably corresponds to the rocker arm housing notch 1211. The rocker arm housing indentations, along with the bearing seat indentations, together provide sufficient space for the intermediate gear 1152 and the bull gear 1221.

Besides the parts mentioned above, the front stage transmission system and the rear stage transmission system can adopt the existing transmission structure, such as gear transmission, spline transmission and the like.

The standing shell can be further provided with a guard plate 113, the standing shell, the rocker arm shell and the guard plate jointly enclose a closed cavity, an oil cylinder seat arranged on the standing shell is located in the closed cavity, and an oil cylinder seat arranged on the outer side of the root of the rocker arm shell is also located in the closed cavity. In the installation state, in the swinging process of the rocker arm without the motor, the whole oil cylinder is always positioned in the closed cavity. The closed cavity provides a good external environment for the oil cylinder, for example, the influence of coal dust gangue on the oil cylinder can be avoided, the oil cylinder is more reliable in stretching and retracting and has a longer service life, and therefore, a more reliable and high-quality support is provided for the rotation of the rocker arm relative to the non-swinging transmission part.

The idle space oil tank at the rear of the preceding stage transmission system in the standing shell is set into an oil tank 1111, a hydraulic system 114 for providing hydraulic driving force for the oil cylinder is installed in the oil tank, and a transmission shaft in the preceding stage transmission system replaces a pump motor of the hydraulic system to provide power for the hydraulic system, namely, the pump set is a pump set without the pump motor.

Because the power of the cutting motor is far greater than that of the pump motor, even if the power requirement of the hydraulic system is larger, the hydraulic system does not need to occupy larger installation space due to the need of equipping the pump motor with larger power as in the traditional pump set, and therefore the hydraulic system is compact in structure and has surplus power. The motor installation cavity and the rocker arm installation cavity are usually arranged at the left end and the right end of the standing shell, most space between the two cavities is an idle area, a part of the idle area is utilized to form a built-in oil tank, the oil tank of the hydraulic system is changed from an external position to a built-in position of the cutting system, the structure of the coal mining machine is more compact, the height of a machine face is not increased, and the span of a roller is not increased.

With regard to the traction system 2, the high-speed reduction mechanism 22 preferably employs a compact planetary mechanism to maintain a small axial dimension, ensure the strength and rigidity of the planetary axles, and also contribute to a reduction in the forward-backward dimension of the traction system.

The middle section speed reducing mechanism is a multi-shaft fixed-shaft transmission gear set, and comprises a head end gear assembly 231, a middle gear assembly 232 and a tail end gear assembly 233 which are sequentially arranged in a transmission direction, wherein the shafts are arranged in parallel, and the input end of the head end gear assembly is coaxially and fixedly connected with the output end of the high-speed section speed reducing mechanism. In the left and right extension sections, each transmission shaft in the middle section speed reducing mechanism corresponds to one mounting hole.

The intermediate gear assembly 232 can include one or more transmission shafts, the number of the transmission shafts included in the intermediate gear assembly is increased or decreased, and the traction shells of the left and right extension sections with different lengths in the left and right directions are matched and replaced, so that the span adjustment between the left and right travelling wheels can be realized.

The left and right extension sections are designed according to the principle of minimizing the internal cavity, only the necessary installation space and the necessary processing process holes of the intermediate gear assembly and the associated parts are reserved, and the other parts are made into solid bodies, so that the center of gravity of the whole coal mining machine can be moved to the mining side, the running balance of the coal mining machine is kept, and the abrasion of a guide device is reduced.

The height of the left and right extension sections is less than that of the front and rear extension sections. The front and rear extensions are located in region C, and both the top surface 241 and the bottom surface 251 are horizontal planes. The front section 242 of the top surface of the left and right extension section is set to be a horizontal surface, the middle and rear sections 243 of the top surface of the left and right extension section are set to be an inclined surface with a higher front part and a lower rear part, and the inclined angle of the inclined surface is preferably parallel or nearly parallel with the bottom inclined surface of the support thick beam 912 of the support top beam 91 of the coal mining machine. The front section 242 and the middle and rear section 243 of the top surface of the left and right extension section respectively correspond to the area B and the area A, and respectively keep equal distance with the flat bottom surface of the front bracket thin beam 911 of the bracket top beam 91 and the inclined bottom surface of the middle and rear bracket thick beam 912, so that enough effective passing clearance above the coal mining machine is ensured.

The front section 252 of the bottom surface of the left and right extension section is set to a horizontal surface, and the middle rear section 253 of the bottom surface of the left and right extension section is set to a concave surface whose middle part is concave in the front-rear direction, so that a sufficient coal passing gap can be maintained between the traction housing 21 and the scraper conveyor 92.

Therefore, enough safety distance is reserved between the front and rear extension sections and the top plate, the bottom plate and the coal wall, or between the left and right extension sections and the bracket and the scraper conveyor of the coal mining machine, so that the top plate gap, the bottom plate gap, the coal wall gap and the machine passing gap can be ensured, and the adaptability of the thin coal seam coal mining machine to the working face under the fluctuating condition is improved.

The thin seam mining machine further comprises a traveling system 3, and the traveling system can comprise a traveling box shell 30, a driving wheel shaft, a traveling wheel group 32, a traveling wheel shaft 323 and a guide slipper 33. The traveling box housing 30 is fixed to the rear outer walls of the left and right extension sections of the traction housing 21. The front end of the driving wheel shaft is coaxially and fixedly connected with the output end of the middle section speed reducing mechanism, and the driving wheel shaft penetrates through the traction shell and the walking box shell backwards and is rotatably supported on the front side wall and the rear side wall of the walking box shell. The driving wheel is coaxially fixed on the driving wheel shaft. Two ends of the walking wheel shaft 323 are rotatably supported on the front and rear side walls of the walking box shell 30 respectively, the connecting gear 321 and the walking wheel 322 in the walking wheel set are coaxially and fixedly connected, and the walking wheel is coaxially mounted on the walking wheel shaft. The connecting gear 321 is externally engaged with the driving wheel.

The guide shoe 33 includes a base 331 including a front side wall, a rear side wall, and a top plate connected between the tops of the front and rear side walls, and a barb disposed at the bottom of either the front or rear side wall, and an ear mount 332 disposed above the base and generally midway along the left-right length. The left and right ends of the base are respectively surrounded by a front side wall, a top plate, a rear side wall and barbs to form a guide groove extending left and right and used for being matched with the rail 93. The rear surface of the front side wall, the bottom surface of the top plate, the front surface of the rear side wall and the top surface of the barb are all provided with wear-resistant layers. The guide sliding shoes are installed on the lower portion of the walking box shell, and are connected with the walking box shell in a swinging mode through ear holes in ear seats of the guide sliding shoes. Ideally, the axis of the walking wheel shaft coincides with the center line of the ear hole. The guide sliding shoes can have small movement amount in the front-back direction relative to the walking box shell, and the lug holes are waist-shaped holes which are wide at the left and right and narrow at the upper and lower parts, so that the guide sliding shoes have enough swinging space in the horizontal and vertical directions.

The guide shoe is provided with a left concave surface 333 and a right concave surface 333 which are respectively concave to the inside of the base, and the concave surfaces are positioned on at least one of the left side surface and the right side surface of the ear seat, the left top surface and the right top surface of the base which are separated by the ear seat, and the transition connection part of the left side and the right side of the ear seat and the top surface of the base (namely the top surface of the top plate). The drive axle is disposed as close as possible to the recessed surface in the radial direction, and the drive axle is located between the lug and one of the guide grooves in the left-right direction.

The traveling system of the existing thin or ultra-thin coal seam mining machine only has one shaft, namely a driving wheel shaft in the invention, the front part of the driving wheel shaft is positioned in the machine body of the mining machine, the driving wheel shaft is connected with a traction system of the mining machine and receives power from the traction system, and the rear part of the driving wheel shaft is positioned in the traveling system, and traveling wheels are directly installed on the driving wheel shaft. The road wheels are usually large in module and large in diameter in consideration of the external meshing walking force and wear requirements. According to the current design rule, the larger the diameter of the gear installed on the driving wheel shaft is, the lower the axis of the driving wheel shaft is relative to the machine surface, so that the thicker the machine body is, the smaller the coal passing height under the condition of the same machine surface height is.

After the double-shaft-structure traveling system with the driving wheel shaft and the traveling wheel shaft is adopted, the traveling wheels are not arranged on the driving wheel shaft, but the driving wheels, the diameter of the driving wheels can be greatly reduced compared with the diameter of the traveling wheels due to the absence of the engagement requirement of the traveling wheels and the rails, so that the axis of the driving wheel shaft can be greatly moved upwards, the required machine body thickness is obviously reduced, and correspondingly, the coal passing height is obviously increased under the condition of the same machine face height, so that the problems of chain jamming of a scraper machine, increase of resistance of a coal mining machine, insufficient traction force and the like when the thin or extremely thin coal seam coal mining machine encounters large coal blocks, gangue and the like can be solved.

The recessed surface is arranged to leave a space for the driving wheel shaft to be installed closer to the walking wheel shaft in the radial direction. The driving wheel shaft and the walking wheel shaft are arranged close to each other, so that the fall of the driving wheel shaft and the walking wheel shaft in the height direction can be greatly reduced, and the coal passing height below the machine body and above the scraper conveyor can be further increased under the condition that the machine surface height of the machine body of the coal mining machine is unchanged.

The driving wheel and the driving wheel shaft are preferably of an integrated structure and can be called as an integrated driving wheel 31, compared with a split structure, the diameters of the wheel shaft and the gear part can be smaller, the height of a machine face can be set lower, and meanwhile, the coal passing height under a larger machine body is also provided. Under the condition of unchanged height of the machine surface, the coal passing height can be further increased. Because the connecting gear is meshed with the driving wheel with smaller diameter, the travelling mechanism has larger transmission ratio, the size of the related structure of the traction system can be smaller, the service life can be longer, and simultaneously, compared with the direct driving of the driving wheel to the travelling wheel, the service life of the gear can be greatly prolonged by adopting multi-gear transmission of the driving wheel to the travelling wheel through the connecting gear.

The driving wheel shaft and the walking wheel shaft are respectively rotatably supported on the walking box shell through bearings. The connecting gear is connected with the traveling wheel through a spline, and the connecting gear and the traveling wheel are fixed in the axial direction. The walking wheel is sleeved on the walking wheel shaft, the axial middle part of the walking wheel is in splined connection with the walking wheel shaft, and no axial limit is arranged between the walking wheel and the walking wheel shaft. The two ends of the travelling wheels are in clearance fit with the axle holes of the travelling wheel shafts, and the travelling wheels can flexibly slide along the axial direction of the travelling wheel shafts, so that the adaptability of the travelling wheels relative to the track can be improved. After the walking wheel and the walking wheel shaft adopt the connecting structure, the diameter of the walking wheel can be set to be smaller, so that the height of a machine surface can be kept lower and the adaptability is better.

The thin seam coal mining machine is further provided with a middle box 4, and the cutting system and the traction system are respectively provided with a left side and a right side which are respectively placed and fixed on the left side and the right side of the middle box. During connection, the left-right direction is taken as the main connection direction among the standing shell 111, the traction shell 21 and the middle box 4, the joint surface is positioned by a positioning pin, and the screw rod 5 is matched with a nut to be connected and fastened left and right. In addition, still set up auxiliary connection spare in the front and back direction between casing of stewing and the traction housing and fasten to improve the joint strength of the two.

The interior space of the intermediate box can be used for installing the electric control system of the shearer and the associated pipelines.

The intermediate box may be divided into a front portion and a middle rear portion, the front portion being located at the C region. The top surface 411 and the bottom surface 421 of the front part are respectively the front top surface and the front bottom surface of the middle box, and the top surface of the middle rear part is divided into a middle top surface 412 of the middle box and a rear top surface 413 of the middle box from front to rear, which respectively correspond to the B area and the A area. The bottom surface of the middle rear part is divided into two sections, namely a middle bottom surface 422 of the middle box and a rear bottom surface 423 of the middle box from front to rear, and the two sections correspond to the B area and the A area respectively. The middle rear portion is shorter in height than the front portion. The height of top surface and middle case back top surface reduces in proper order in the middle of anterior top surface, middle case, the bottom surface highly is higher than anterior bottom surface behind the middle case, the bottom surface passes through between anterior bottom surface and middle case back bottom surface in the middle of the middle case, top surface is the low inclined plane in high back before the middle case back, the bottom surface is the concave surface of middle part indent in the fore-and-aft direction behind the middle case. The arrangement is also used for ensuring that the coal mining machine has enough effective machine passing clearance above the coal mining machine and has enough coal passing height below the coal mining machine.

Claims (12)

1. The coal mining machine for the thin coal seam is characterized by comprising a cutting system and a traction system, wherein the cutting system comprises a non-swing transmission part, a motor-free rocker arm, a cutting motor and an oil cylinder, the non-swing transmission part comprises a standing shell and a front-stage transmission system arranged in the standing shell, the motor-free rocker arm comprises a rocker arm shell and a rear-stage transmission system arranged in the rocker arm shell, a motor installation cavity and a rocker arm installation cavity are arranged in the standing shell, the cutting motor is fixedly installed in the motor installation cavity, the root of the rocker arm shell is rotatably supported in the rocker arm installation cavity, an output shaft of the cutting motor passes through the front-stage transmission system and is connected with the rear-stage transmission system, the input end of the rear-stage transmission system is provided with a large gear and a planetary mechanism which are sequentially and coaxially connected, the large gear and planetary mechanism are arranged in a cavity at the root of the rocker arm shell, the axis of the large gear is coaxial with the rotation center of the root of the rocker arm shell, the two ends of the oil cylinder are respectively hinged with the rocker arm shell and the large gear and the standing shell, the hinged axes of the two ends of the oil cylinder and the hinged axes of the high-speed reduction motor are arranged in the left-speed-drawing mechanism, the left-drawing mechanism and right traction mechanism, the left-speed-reduction traction mechanism are arranged at the left-right end and the left-right end of the rear-extension section, the left-extension end of the left-extension section, the left-right-extension high-extension.

2. The thin seam shearer of claim 1, wherein: the utility model discloses a rocking arm casing, including rocking arm installation cavity, casing notch, pinion and intermediate gear, the casing notch is equipped with on the casing of stewing on the public lateral wall between rocking arm installation cavity and other adjacent cavities, be equipped with rocking arm casing breach on the root lateral wall of rocking arm casing, under the installation status, rocking arm casing breach in week always keep with the casing notch has partial overlap area, preceding stage transmission system's output adopts mutual external toothing's pinion and intermediate gear, the intermediate gear with the gear wheel is in the overlap area of casing notch and rocking arm casing breach keeps the external toothing.

3. The thin seam shearer of claim 2, wherein: the bearing seat is further fixed on the inner wall of the cavity at the root of the rocker arm shell, the position, close to the large gear, of the inner wall of the cavity is close to the inner wall of the cavity, the input shaft diameter of the large gear is supported on the inner wall of the bearing seat through a bearing, a bearing seat notch is formed in the side wall of the bearing seat, and the circumferential position and the size of the bearing seat notch are consistent with those of the rocker arm shell notch.

4. The thin seam shearer of claim 3, wherein: the oil cylinder is characterized in that a guard plate is installed on the standing shell, the rocker arm shell and the guard plate jointly enclose a closed cavity, and the oil cylinder is located in the closed cavity.

5. The thin seam shearer of claim 4, wherein: the rear space of the fore-stage transmission system in the standing shell is set into an oil tank, a hydraulic system for providing hydraulic driving force for the oil cylinder is installed in the oil tank, and a transmission shaft in the fore-stage transmission system replaces a pump motor of the hydraulic system to provide power for the hydraulic system.

6. The thin seam shearer of claim 1, 2, 3, 4, or 5, wherein: high-speed section reduction gears adopts compact planetary mechanism, interlude reduction gears is dead axle transmission gear group, includes head end gear assembly, intermediate gear assembly and the terminal gear assembly that sets gradually according to the transmission direction, each axle parallel arrangement, the input of head end gear assembly with the coaxial fixed connection of high-speed section reduction gears's output, include one or many transmission shafts in the intermediate gear assembly.

7. The thin seam shearer of claim 6, wherein: the left and right extension sections only reserve necessary installation space and necessary fabrication holes of the intermediate gear assembly, and the rest parts are made into solid bodies.

8. The thin seam shearer of claim 6, wherein: the height of the left and right extension sections is smaller than that of the front and back extension sections, the middle and back sections of the top surfaces of the left and right extension sections are arranged to be inclined planes with high front parts and low back parts, and the middle and back sections of the bottom surfaces of the left and right extension sections are arranged to be concave surfaces with concave parts in the middle in the front and back directions.

9. The thin seam shearer of claim 6, wherein: the walking mechanism comprises a walking box shell, a driving wheel shaft, a walking wheel group, a walking wheel shaft and a guide sliding shoe, wherein the walking box shell is fixed on the outer wall of the rear side of the left and right extension sections of the traction shell, the front end of the driving wheel shaft is coaxially and fixedly connected with the output end of the middle section speed reducing mechanism, the driving wheel shaft passes through the traction shell and the walking box shell backwards and is rotatably supported on the front and rear side walls of the walking box shell, the driving wheel is coaxially fixed on the driving wheel shaft, the two ends of the walking wheel shaft are respectively rotatably supported on the front and rear side walls of the walking box shell, a connecting gear and a walking wheel in the walking wheel group are coaxially and fixedly connected, the walking wheel is coaxially arranged on the walking wheel shaft, the connecting gear is externally engaged with the driving wheel, the guide sliding shoe comprises a base and an ear seat positioned above the base, the base comprises a front side wall, a rear side wall and a top plate connected between the front side wall and the rear side wall, barbs are arranged at the bottom of the front side wall or the rear side wall, a guide groove extending leftwards and rightwards is respectively defined by the front side wall, the top plate, the rear side wall and the barbs at the left end and the right end of the base, the guide shoe is installed at the lower part of the walking box and is connected with the shell of the walking box in a swinging mode through an ear hole on an ear seat of the guide shoe, the axis of a walking wheel shaft is superposed with the central line of the ear hole, a left concave surface and a right concave surface which are concave towards the inside of the base are respectively arranged on the guide shoe, the concave surfaces are positioned on at least one of the left side surface and the right side surface of the ear seat, the left top surface and the right top surface of the base which are separated by the ear seat and the transition connection positions of the left side, the driving wheel shaft in the left-right direction is positioned between the lug seat and one of the guide grooves.

10. The thin seam shearer of claim 9, wherein: the driving wheel and the driving wheel shaft are of an integrated structure, the driving wheel shaft and the walking wheel shaft are rotatably supported on the walking box shell through bearings, the connecting gear is connected with the walking wheel through a spline and fixed with each other in the axial direction, the walking wheel is sleeved on the walking wheel shaft, the axial middle part of the walking wheel is connected with the walking wheel shaft through a spline, and two ends of the walking wheel are in clearance fit with the shaft hole between the walking wheel shaft.

11. The thin seam shearer according to any one of claims 1 to 10, wherein: the cutting system and the traction system are respectively provided with a left side and a right side, and are respectively placed and fixed on the left side and the right side of the middle box.

12. The thin seam shearer of claim 11, wherein: the middle box comprises a front part and a middle rear part, the front top surface and the bottom surface are respectively the front top surface of the middle box and the front bottom surface of the middle box, the top surface of the middle rear part is divided into the middle top surface of the middle box and the rear top surface of the middle box from front to back, the bottom surface of the middle rear part is divided into the middle bottom surface of the middle box and the rear bottom surface of the middle box from front to back, the height of the middle rear part is smaller than that of the front part, the height of the middle top surface of the front part, the height of the middle bottom surface of the middle box is smaller than that of the middle rear top surface of the middle box, the height of the middle top surface of the middle box is smaller than that of the middle box, the middle rear bottom surface of the middle box is a.

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