Walking system of coal shearer for extremely thin coal seam, its installation structure and adjustment method for height position of fuselage

Abstract

The present invention relates to a traveling system of a shearer for extremely thin coal seams, its installation structure, and a method for adjusting the height position of the machine body. The traveling system includes a traveling box housing, an integral drive wheel, a traveling wheel assembly, a traveling wheel shaft, and a guiding slide shoe. The traveling wheel shaft and the wheel shaft of the integral drive wheel are rotatably supported on the front and rear side walls of the traveling box housing. In the traveling wheel assembly, a large gear and the traveling wheel are coaxially and fixedly connected, the traveling wheel is coaxially installed on the traveling wheel shaft, the large gear is externally meshed with the drive wheel, and there are concave surfaces on the left and right sides of the guiding slide shoe, and the axis of the drive wheel is arranged close to the concave surface. By fixing the axis position of the drive wheel shaft and adjusting the height position of the traveling wheel shaft, the height position of the machine body is adjusted, and the traveling system is installed by using the connection interface structure of the traveling box. The present invention can reduce the height difference between the drive wheel shaft and the traveling wheel shaft of the traveling system of the shearer, so that a shearer for thin or extremely thin coal seams with high power and low cutting height can obtain a larger coal passing height under the condition of the same machine surface height.

Description

Technical Field

[0001] The present invention relates to a traveling system of a coal shearer, especially a traveling system of a coal shearer for thin or extremely thin coal seams, and is applicable to a low-profile high-power coal shearer for mining thin or extremely thin coal seams. Background Art

[0002] For the mining of thin or extremely thin coal seams, the coal shearer for thin or extremely thin coal seams requires an increasingly lower body height. On the other hand, in order to adapt to the mining of complex geological conditions such as the coexistence of coal and rock, a larger installed power is required. As the power increases, the sizes of motors, transmission systems, etc. also increase correspondingly by a large amount, which becomes a contradiction with the requirement of an increasingly lower body height. Therefore, the structural design of a coal shearer for thin or extremely thin coal seams is a difficult point. One prominent problem is that the coal passing height under the body and above the scraper conveyor is relatively small. When encountering large pieces of coal, gangue, etc., it will cause problems such as chain jamming of the scraper conveyor, greatly increased resistance of the coal shearer, and insufficient effective traction force.

[0003] In the industry, a technical solution has been proposed and gradually used to move large and medium-sized components such as motors and transmission gears from above the original scraper conveyor to the side close to the coal wall, that is, to adopt the way of a suspended body to solve the layout problem of large and medium-sized components. This way is beneficial to reducing the body height, but usually still cannot solve the problem of relatively small coal passing height. Summary of the Invention

[0004] The present invention aims to provide a traveling system of a coal shearer for extremely thin coal seams, its installation structure, and a method for adjusting the body height position, so that a coal shearer for thin or extremely thin coal seams with high power and low mining height can obtain a larger coal passing height under the condition of the same machine surface height.

[0005] The main technical solutions of the present invention are as follows:

[0006] An extremely thin coal seam shearer traveling system, comprising a traveling box housing, a driving wheel, a driving wheel shaft, a traveling wheel assembly, a traveling wheel shaft and a guiding sliding shoe. The traveling wheel shaft and the driving wheel shaft are both rotatably supported on the front and rear side walls of the traveling box housing. A large gear in the traveling wheel assembly is coaxially and fixedly connected to the traveling wheel. The traveling wheel is coaxially installed on the traveling wheel shaft. The driving wheel is coaxially fixed on the driving wheel shaft. The large gear is externally meshed with the driving wheel. The guiding sliding shoe includes a base and an ear seat located above the base. The base includes a front side wall, a rear side wall and a top plate connected between the tops of the front and rear side walls. A barb is provided at the bottom of the front side wall or the rear side wall. At the left and right ends of the base, a left-right extending guiding groove is respectively formed by the front side wall, the top plate, the rear side wall and the barb. The guiding sliding shoe is installed at the lower part of the traveling box housing and is swingably connected to the traveling box housing through an ear hole on its ear seat. The axis of the traveling wheel shaft coincides with the center line of the ear hole. The guiding sliding shoe is provided with a concave surface recessed inwardly towards the inside of the base at each of the left and right sides. The concave surface is located at least at one of the positions of the left and right side surfaces of the ear seat, the left and right top surfaces of the base separated by the ear seat, and the transition joints between the left and right sides of the ear seat and the top surface of the base. The driving wheel shaft is arranged radially close to the concave surface. In the left-right direction, the driving wheel shaft is located between the ear seat and one of the guiding grooves.

[0007] Both the front side wall and the rear side wall of the base are left-right continuous structures. The ear seat is a double-ear seat, including a front ear seat and a rear ear seat. The front ear seat and the rear ear seat are respectively connected to the inner sides of the front side wall and the rear side wall of the traveling box housing. When the barb is connected to the front side wall of the base, the large gear is arranged at the front side of the traveling wheel. When the barb is connected to the rear side wall of the base, the large gear is arranged at the rear side of the traveling wheel.

[0008] The front side wall of the base is a left-right continuous structure. The rear side wall of the base is a left-right direction middle-disconnected structure. The ear seat only has a front ear seat. A support plate extending rearward is provided at the top of the front ear seat. The barb is connected to the front side wall of the base. The front ear seat is connected to the inner side of the front side wall of the traveling box housing. The large gear is arranged at the front side of the traveling wheel.

[0009] The rear side wall of the base is a left-right continuous structure. The front side wall of the base is a left-right direction middle-disconnected structure. The ear seat only has a rear ear seat. A support plate extending forward is provided at the top of the rear ear seat. The barb is connected to the rear side wall of the base. The rear ear seat is connected to the inner side of the rear side wall of the traveling box housing. The large gear is arranged at the rear side of the traveling wheel.

[0010] The walking box housing may include a connecting plate, a transition seat, a retaining ring, and a gland. The connecting plate and the gland are fixedly connected and enclose a box structure that is closed on the front, rear, and upper sides. The drive wheel shaft is rotatably supported on the connecting plate and the gland through bearings. The retaining ring is sleeved on the drive wheel shaft and is fixed to the connecting plate from the inner side of the walking box housing to axially limit the front bearing. The transition seat is fixed to the connecting plate from the inner side of the walking box housing. The front and rear ends of the walking wheel shaft are respectively rotatably supported on the transition seat and the gland through bearings. When it comes to the connection between the front ear seat of the guide sliding shoe and the walking box housing, a front shaft section that extends inwardly towards the inner side of the walking box housing is provided on the transition seat, and the front shaft section is in shaft hole fit with the front ear seat hole. When it comes to the connection between the rear ear seat of the guide sliding shoe and the walking box housing, a rear shaft section that extends inwardly towards the inner side of the walking box housing is provided on the gland, and the rear shaft section is in shaft hole fit with the rear ear seat hole.

[0011] The connecting plate is a vertical plate. The gland may include a horizontal plate portion and a vertical plate portion. The front end of the horizontal plate portion and the upper part of the connecting plate are positioned by one plane and two pins. The rear ends of the drive wheel shaft and the walking wheel shaft are both installed on the vertical plate portion. The top surface of the connecting plate is provided with a connecting plate top inclined surface that is higher at the front and lower at the rear. The top surface of the horizontal plate is provided with a gland top inclined surface that is higher at the front and lower at the rear.

[0012] The walking box housing may be provided with a plurality of through holes that penetrate the connecting plate and the gland from front to rear.

[0013] The ear hole is preferably a waist-shaped hole that is wider from left to right and narrower from top to bottom.

[0014] The recessed surface is preferably a straight cylindrical surface, and the generatrix of this straight cylindrical surface extends from front to rear.

[0015] The drive wheel and the drive wheel shaft are preferably of an integral structure.

[0016] The large gear may be splined to the walking wheel and is fixed to each other axially. The walking wheel is sleeved on the walking wheel shaft. The middle part of the walking wheel and the walking wheel shaft may be connected by splines. There is an axial clearance fit between the two ends of the walking wheel and the walking wheel shaft.

[0017] An installation structure of a traveling system for a coal shearer in an extremely thin coal seam, including the fuselage of the coal shearer and the traveling system of the coal shearer in the extremely thin coal seam. There are two sets of traveling box connection interface structures on the rear side wall of the fuselage, left and right. Each set of traveling box connection interface structures includes a lateral groove and a connecting hole extending in the front-rear direction. The lateral groove has at least one rear groove wall perpendicular to the connecting hole that extends to the notch of the groove. The front end of the connecting hole extends to the rear groove wall and communicates with the lateral groove. The front side wall of the traveling box housing fits against the rear side wall of the fuselage, and the two are positioned by a pin structure. The traveling box housing is fixed to the fuselage by two sets of screws, and the two sets of screws are respectively inserted into the left and right connecting holes. The heads of the screws press on the traveling box housing. The tail of each set of screws is threadedly connected to a threaded block, and the left and right threaded blocks respectively abut against the left and right rear groove walls. The traveling box housing has multiple different installation angle positions with the axis of the drive wheel shaft as the rotation center. When at different installation angles, the left and right sets of holes for passing screws on the traveling box housing do not exceed the range of the connecting holes in the up-down, left-right directions.

[0018] A method for adjusting the height position of the fuselage of a coal shearer in an extremely thin coal seam. This method is based on the following installation structure of the traveling box system. The traveling box housing of the traveling system of the coal shearer in the extremely thin coal seam is detachably fixed to the fuselage of the coal shearer, so that the front side wall of the traveling box housing fits against the rear side wall of the fuselage, and a pin structure is used for positioning between the fitting surfaces. When it is necessary to raise the position of the fuselage or increase the coal passing height, keeping the axis position of the drive wheel shaft unchanged, the traveling box housing is swung at a small angle, so that the axis of the traveling wheel shaft moves downward relative to the axis of the drive wheel shaft and is fixed again. Conversely, the axis of the traveling wheel shaft moves upward relative to the axis of the drive wheel shaft and is fixed again.

[0019] The beneficial effects of the present invention are:

[0020] By adopting a traveling system with a double-axis structure of a drive wheel shaft plus a traveling wheel shaft, the diameter of the drive wheel installed on the drive wheel shaft is greatly reduced compared with the original traveling wheel. At the same time, the concave surface provided on the left side and / or the right side of the ear seat of the guiding sliding shoe can make the installation position of the drive wheel shaft closer to the traveling wheel shaft, reducing the height difference between the drive wheel shaft and the traveling wheel shaft in the height direction. Therefore, when the machine surface height of the fuselage of the coal shearer remains unchanged, the coal passing height below the fuselage and above the scraper conveyor can be increased a lot. Therefore, it can solve problems such as chain jamming of the scraper conveyor, increased resistance of the coal shearer, and insufficient effective traction force when the coal shearer in a thin or extremely thin coal seam encounters large pieces of coal, gangue, etc.

[0021] The present invention can make the coal shearer have a lower machine surface height under the same coal passing height, making it possible to mine thin or extremely thin coal seams, and greatly improving the adaptability.

[0022] Due to the adoption of an integrated drive wheel, the diameters of the axle and gear parts of the drive wheel can be made smaller, the height of the machine surface can be set lower, and at the same time, there is a larger coal passing height under the fuselage. When the height of the machine surface remains unchanged, the coal passing height can be further increased. Since the large gear meshes with the drive wheel of a smaller diameter, the traveling mechanism has a larger transmission ratio. Therefore, the dimensions of the relevant structures of the shearer traction system as the front-stage transmission system can be smaller and the service life can be longer. At the same time, due to the adoption of a multi-gear transmission from the drive wheel through the large gear to the traveling wheel, compared with the direct drive of the drive wheel to the traveling wheel, the gear service life can be greatly improved.

[0023] The ear hole is a waist-shaped hole that is wider from left to right and narrower from top to bottom, which is beneficial to providing the space required for the horizontal swing of the guiding slide shoe relative to the traveling box housing.

[0024] The traveling wheel and the traveling wheel shaft are connected by splines. The traveling wheel shaft is supported on the front and rear side walls of the traveling box housing through bearings. After adopting this connection structure, the diameter of the traveling wheel can be smaller, so a lower machine surface height and better adaptability can be maintained. Brief Description of the Drawings

[0025] Figure 1 The front view of the first embodiment (left traveling system) of the present invention;

[0026] Figure 2 For Figure 1 The A-A stepped sectional view of

[0027] Figure 3 For Figure 1 The B-B sectional view of

[0028] Figure 4 The partial sectional view (horizontal direction) of the first embodiment (left traveling system) of the present invention;

[0029] Figure 5 For Figure 1 The partial sectional view (vertical direction) of the integrated drive wheel in

[0030] Figure 6 For Figure 1 The partial sectional view (vertical direction) of the traveling wheel assembly in

[0031] Figure 7 For Figure 1 The assembly structure schematic diagram of the traveling wheel assembly and the traveling wheel shaft in

[0032] Figure 8 For Figure 1 The sectional view of the traveling wheel assembly in

[0033] Figure 9 For Figure 1Front view of the guide sliding shoe in

[0034] Figure 10 is Figure 9 C-C sectional view of

[0035] Figure 11 is Figure 9 top view of

[0036] Figure 12 Front view of the second embodiment (left walking system) of the present invention;

[0037] Figure 13 is Figure 12 A-A stepped sectional view of

[0038] Figure 14 is Figure 12 B-B sectional view of

[0039] Figure 15 Partial sectional view (horizontal direction) of the second embodiment (left walking system) of the present invention;

[0040] Figure 16 is Figure 12 Partial sectional view (vertical direction) of the integral drive wheel in

[0041] Figure 17 is Figure 12 Partial sectional view (vertical direction) of the walking wheel assembly in

[0042] Figure 18 is Figure 12 Schematic diagram of the assembly structure of the walking wheel assembly and the walking wheel shaft in

[0043] Figure 19 is Figure 12 Sectional view of the walking wheel assembly in

[0044] Figure 20 is Figure 12 Front view of the guide sliding shoe in

[0045] Figure 21 is Figure 20 C-C sectional view of

[0046] Figure 22 is Figure 20 top view of

[0047] Figure 23 Schematic diagram of another installation position of the walking box housing of the first embodiment (left walking system) of the present invention.

[0048] Reference numerals:

[0049] 1. Integral drive wheel;

[0050] 2. Travel wheel assembly; 21. Large gear; 22. Travel wheel; 221. Front positioning hole of travel wheel; 222. Rear positioning hole of travel wheel; 223. Spline connection of travel wheel; 23. Support half ring; 24. Support gland

[0051] 31. Travel wheel shaft; 311. Front positioning shaft of travel wheel shaft; 312. Rear positioning shaft of travel wheel shaft; 313. Spline connection of travel wheel shaft; 314. Rear oil hole; 315. Front oil hole; 32. Bearing

[0052] 4. Guide sliding shoe; 41. Base; 411. Front side wall; 412. Rear side wall; 413. Top plate; 414. Barbs; 42. Ear seat; 421. Ear hole; 422. Support plate; 43. Concave surface

[0053] 51. Connecting plate; 511. Upper positioning; 512. Lower positioning; 513. Top inclined surface of connecting plate; 52. Transition seat; 521. Front shaft section; 53. Retaining ring; 54. Gland; 541. Rear shaft section; 542. Top inclined surface of gland; 55. First end cover; 56. Second end cover

[0054] 71. Threaded block; 72. Bolt

[0055] 91. Traction housing; 911. Lateral groove; 912. Connecting hole; 913. Final drive gear for traction

[0056] 92. Track Detailed implementation mode

[0057] The present invention discloses a traveling system for a coal shearer in extremely thin coal seams, as Figure 1 - 23 shown, which includes a traveling box housing, a drive wheel, a drive wheel shaft, a travel wheel assembly 2, a travel wheel shaft 31 and a guide sliding shoe 4. The travel wheel shaft and the drive wheel shaft are both rotatably supported on the front and rear side walls of the traveling box housing through bearings. The large gear 21 and the travel wheel 22 in the travel wheel assembly are coaxially and fixedly connected, and the travel wheel is coaxially installed on the travel wheel shaft. The drive wheel is coaxially fixed on the drive wheel shaft. The large gear is externally meshed with the drive wheel.

[0058] The guiding sliding shoe includes a base 41 and an ear seat 42 located above the base and generally in the middle of the left - right length direction. The base includes a front side wall 411, a rear side wall 412, and a top plate 413 connected between the tops of the front and rear side walls. Barbs 414 are provided at the bottom of the front side wall or the rear side wall. At the left and right ends of the base, a guiding groove extending left - right is respectively formed by the front side wall, the top plate, the rear side wall, and the barb, for mating with the track 92. Wear - resistant layers are provided on 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. The guiding sliding shoe is installed at the lower part of the walking box housing, and realizes its swing connection with the walking box housing through the ear hole 421 on its ear seat. Ideally, the axis of the walking wheel shaft coincides with the center line of the ear hole. The guiding sliding shoe can have a small amount of longitudinal movement relative to the walking box housing in the front - rear direction, so that the guiding sliding shoe has sufficient swing space in the horizontal and vertical directions.

[0059] On the guiding sliding shoe, there are concave surfaces 43 recessed inward into the base, one on each side in the left - right direction. The concave surfaces are located at least at one of the following positions: the left and right side surfaces of the ear seat, the left and right top surfaces of the base separated by the ear seat, and the transition joints between the left and right sides of the ear seat and the top surface of the base (i.e., the top surface of the top plate 413). Setting the concave surfaces can leave space for the driving wheel shaft to be installed closer to the walking wheel shaft in the radial direction. The driving wheel shaft is arranged as close as possible to the concave surfaces in the radial direction, and in the left - right direction, the driving wheel shaft is located between the ear seat and one of the guiding grooves.

[0060] The existing walking system of thin or extremely thin coal seam shearers has only one shaft, namely the driving wheel shaft in the present invention. The front part of it is located inside the body of the shearer, connecting the traction system of the shearer and receiving power from the traction system. The rear part is located inside the walking system, and the walking wheel is directly installed on it. Considering the requirements of external - meshing walking force and wear, the walking wheel usually has a relatively large module and diameter. According to the current design rules, the larger the diameter of the gear installed on the driving wheel shaft, the lower the axis of the driving wheel shaft is relative to the machine surface, so the thicker the body thickness is required, and the smaller the coal - passing height is under the condition of the same machine - surface height.

[0061] When the walking system with a two - shaft structure of the driving wheel shaft plus the walking wheel shaft of the present invention is adopted, what is installed on the driving wheel shaft is no longer the walking wheel but the driving wheel. Since there is no requirement for the engagement between the walking wheel and the track, the diameter of the driving wheel can be significantly reduced compared with the walking wheel. Therefore, the axis of the driving wheel shaft can be significantly raised, and accordingly, the required body thickness is significantly reduced. Correspondingly, the coal - passing height is significantly increased under the condition of the same machine - surface height. Therefore, it can solve the problems of the thin or extremely thin coal seam shearer such as chain jamming of the scraper conveyor when encountering large - sized coal and gangue, increased resistance of the shearer, and insufficient effective traction force.

[0062] Since the concave surface can make the installation position of the drive wheel shaft closer to the walking wheel shaft, the height difference between the drive wheel shaft and the walking wheel shaft in the height direction can be set smaller. Without changing the height of the machine surface of the shearer body, the coal passing height above the scraper conveyor and below the body can be further increased.

[0063] At least one concave surface is provided, which is located on the left or right side of the ear seat, but preferably one is provided on each of the left and right sides, so that the same guiding slide shoe can be used for both the left and right walking systems of the shearer. Further, the guiding slide shoe is generally a left-right symmetric structure and can be interchangeably installed when used on the left and right walking boxes of the shearer.

[0064] The setting of the concave surface makes the top plate or the guiding groove on one side closer to the drive wheel shaft in the left-right direction located outside the left or right side of the drive wheel shaft. There is enough adjustment space for the dimensions of the top plate and the guiding groove and they are not restricted by the drive wheel shaft. For example, the length of the guiding groove can be appropriately lengthened, that is, the length of the corresponding wear-resistant layer is longer, which can improve the service life of the guiding slide shoe to a certain extent. In particular, the thickness of the top plate can be appropriately thickened upwards to improve the overall strength of the guiding slide shoe.

[0065] The drive wheel transmits the power output by the traction transmission final gear 913 to the large gear 21. The large gear rotates synchronously with the walking wheel 22. Finally, the walking wheel 22 meshes and rolls in the frame opening position defined by the guiding slide shoe 4 and the track 92 is located in the groove of the scraper conveyor.

[0066] The present invention constitutes a walking box with a two-shaft (drive wheel shaft and walking wheel shaft) structure. Compared with the existing walking box with a single-shaft structure, the walking wheel can be smaller and an ordinary involute tooth profile can be adopted, which is beneficial to achieving a sufficiently large coal passing height and ensuring the normal meshing of the walking system with the scraper conveyor track.

[0067] The drive wheel and the drive wheel shaft are preferably of an integral structure, which can be called an integral drive wheel 1. Compared with the split structure, the diameters of both the wheel shaft and the gear part can be smaller, the machine surface height can be set lower, and at the same time, there is a larger coal passing height under the body. Without changing the machine surface height, the coal passing height can be further increased. Since the large gear meshes with a drive wheel with a smaller diameter, the walking mechanism has a larger transmission ratio. Therefore, the dimensions of the relevant structures of the shearer traction system as the front-stage transmission system can be smaller and the service life can be longer. At the same time, due to the multi-gear transmission of the drive wheel through the large gear to the walking wheel, compared with the direct drive of the drive wheel to the walking wheel, the gear service life can be greatly improved.

[0068] The guiding slide shoe can adopt the following two structural forms:

[0069] 1. The front side wall and the rear side wall of the base are both continuous structures in the left - right direction. The ear seat is a double - ear seat, including a front ear seat and a rear ear seat. In this case, the front ear seat and the rear ear seat are respectively connected to the inner sides of the front side wall and the rear side wall of the walking box housing. Referring to the first embodiment, when the barb 414 is connected to the front side wall of the base, the large gear is arranged on the front side of the walking wheel; when the barb 414 is connected to the rear side wall of the base, as Figures 9 - 11 shown, the large gear is arranged on the rear side of the walking wheel (refer to Figure 2 , 3 , 6, 7, 8), at this time the drive wheel gear is closer to the rear side wall of the walking box housing, as Figure 4 , 5 shown.

[0070] 2. One of the front side wall and the rear side wall of the base is a continuous structure in the left - right direction, and the other is a structure with a break in the middle in the left - right direction. The ear seat is a single - ear seat. Referring to the second embodiment, the guide sliding shoe can be installed in the following two ways: (1) As Figures 20 - 22 shown, the front side wall of the base is a continuous structure in the left - right direction, the rear side wall of the base is a structure with a break in the middle in the left - right direction, the ear seat only has a front ear seat, and the top of the front ear seat is provided with a support plate 422 that extends backward. The barb is connected to the front side wall of the base. In this case, the front ear seat is connected to the inner side of the front side wall of the walking box housing, and the large gear is arranged on the front side of the walking wheel (refer to Figure 13 , 14 , 17, 18, 19), at this time the drive wheel gear is closer to the front side wall of the walking box housing, as Figure 15 , 16 shown.

[0071] (2) The rear side wall of the base is a continuous structure in the left - right direction, the front side wall of the base is a structure with a break in the middle in the left - right direction, the ear seat only has a rear ear seat, and the top of the rear ear seat is provided with a support plate 422 that extends forward. The barb is connected to the rear side wall of the base. In this case, the rear ear seat is connected to the inner side of the rear side wall of the walking box housing, and the large gear is arranged on the rear side of the walking wheel.

[0072] The top surface of the support plate can be in the same plane or curved surface as the top surface of the corresponding ear seat. In an ideal state, there is a certain gap between the end surface of the overhanging end of the support plate and the inner side surface of the corresponding side wall of the walking box housing, leaving space for the horizontal deflection of the guide sliding shoe. Under the stress state, the end surface of the overhanging end of the support plate often contacts the corresponding side wall of the walking box housing. The support plate and the corresponding side wall of the walking box housing work together to define the front - rear installation position and the horizontal deflection amount of the guide sliding shoe, playing a role in protection and support.

[0073] The walking box housing may include a connecting plate 51, a transition seat 52, a retaining ring 53 and a gland 54. The connecting plate 51 and the gland 54 are fixedly connected to form a box structure that is closed on the front, rear and upper three sides. The drive wheel shaft is rotatably supported on the connecting plate and the gland through bearings. The retaining ring is sleeved on the drive wheel shaft and is fixed to the connecting plate from the inner side of the walking box housing to axially limit the front bearing. The transition seat 52 is fixed to the connecting plate from the inner side of the walking box housing. The front and rear ends of the walking wheel shaft are respectively rotatably supported on the transition seat and the gland through bearings 32. When it comes to the connection between the front ear seat of the guiding sliding shoe and the walking box housing, a front shaft section 521 extending inwardly towards the inner side of the walking box housing is provided on the transition seat, and the front shaft section is in shaft hole fit with the front ear seat. When it comes to the connection between the rear ear seat of the guiding sliding shoe and the walking box housing, a rear shaft section 541 extending inwardly towards the inner side of the walking box housing is provided on the gland, and the rear shaft section is in shaft hole fit with the rear ear seat. The assembly of the connecting plate, the transition seat and the retaining ring serves as the front side wall of the walking box housing.

[0074] The connecting plate 51 is a vertical plate. The gland 54 includes a horizontal plate portion and a vertical plate portion. The front end of the horizontal plate portion and the upper part of the connecting plate are positioned by one plane and two pins. The rear ends of the drive wheel shaft and the walking wheel shaft are both installed on the vertical plate portion. A first end cover 55 and a second end cover 56 are detachably and fixedly connected to the vertical plate portion of the gland. The first end cover and the second end cover respectively cover the rear ends of the drive wheel shaft and the walking wheel shaft from the outside of the walking box housing. The assembly of the gland, the first end cover and the second end cover serves as the rear side wall of the walking box housing, and the horizontal plate portion serves as the top plate of the walking box housing. An outwardly protruding pin column type positioning structure, including an upper positioning 511 and a lower positioning 512, may be provided on the front side surface of the connecting plate and is used as a positioning structure when installing the walking box housing onto the shearer traction housing 91.

[0075] Preferably, a connecting plate top inclined surface 513 with a front high and rear low shape is provided on the top surface of the connecting plate, and a gland top inclined surface 542 with a front high and rear low shape is preferably provided on the top surface of the horizontal plate portion of the gland. The inclination angles of the connecting plate top inclined surface 513 and the gland top inclined surface 542 are preferably parallel or nearly parallel to the bottom surface of the top beam of the shearer support, which can effectively utilize the space and at the same time does not affect the effective height of the machine surface.

[0076] A plurality of through holes penetrating the connecting plate and the gland from front to rear may be provided on the walking box housing. When it is necessary to connect the walking box housing to the traction housing 91, bolts 72 can be passed through them.

[0077] The ear hole is preferably a waist-shaped hole that is wider from left to right and narrower from top to bottom, which is beneficial to providing the space required for the horizontal swing of the guiding sliding shoe relative to the walking box housing.

[0078] The recessed surface is preferably a straight cylindrical surface, and the generatrix of the straight cylindrical surface extends forward and backward. In the assembled state, the drive wheel shaft is arranged close to the recessed surface. The radius of curvature of the recessed surface is determined according to the diameter of the drive wheel shaft, and generally should not be less than the radius of the drive wheel shaft.

[0079] The large gear can be connected to the walking wheel through splines and are axially fixed to each other. In this embodiment, the supporting half rings 23 and the supporting gland 24 fixed on the walking wheel axially fix the large gear 21 on the walking wheel 22 together. The two supporting half rings 23 are snapped into the positioning grooves of the walking wheel 22, and the supporting gland 24 is fixed in the positioning holes on the walking wheel through screws.

[0080] The walking wheel is sleeved on the walking wheel shaft and is preferably connected to the walking wheel shaft through splines. In this embodiment, the middle part of the central hole of the walking wheel is the walking wheel connecting spline 223. The two ends of the walking wheel connecting spline are respectively the front positioning hole 221 and the rear positioning hole 222 of the walking wheel. The front positioning hole 221 and the rear positioning hole 222 of the walking wheel are respectively in shaft-hole fit with the front positioning shaft 311 and the rear positioning shaft 312 of the walking wheel shaft. The walking wheel connecting spline 223 is connected to the walking wheel shaft connecting spline 313. With the above connection structure between the walking wheel and the walking wheel shaft, the diameter of the walking wheel can be smaller, so a lower machine surface height and better adaptability can be maintained.

[0081] To ensure sufficient lubrication at the spline connection between the walking wheel and the walking wheel shaft, front oil holes 315 and rear oil holes 314 can be provided inside the walking wheel shaft and / or the walking wheel. The external openings of the oil holes are provided on the corresponding end faces of the walking wheel shaft and / or the walking wheel. The front oil holes 315 and the rear oil holes 314 are respectively connected to the spline connection from the front and the rear.

[0082] The present invention also discloses an installation structure of a traveling system for a very thin coal seam shearer, which includes the fuselage of the shearer and any one of the above-mentioned traveling systems for a very thin coal seam shearer. On the rear side wall of the fuselage, there are two groups of traveling box connection interface structures on the left and right. Each group of traveling box connection interface structures includes a lateral groove 911 and a connecting hole 912 extending in the front-back direction. The notch of the lateral groove can be one or two, and the position and direction of the notch are not limited. However, at least one of the lateral grooves has a rear groove wall perpendicular to the connecting hole extending to the notch. The front end of the connecting hole extends to the rear groove wall and communicates with the lateral groove. The front side wall of the traveling box housing fits against the rear side wall of the fuselage, and the two are positioned by a pin structure. The traveling box housing is fixed to the fuselage by two groups of screws 72 on the left and right. The two groups of screws are respectively inserted into the two connecting holes on the left and right. The head of the screw presses on the traveling box housing. The tail of each group of screws is threadedly connected to a threaded block 71. The two threaded blocks on the left and right respectively abut against the two rear groove walls on the left and right. The traveling box housing has multiple different installation angles with the axis of the drive wheel shaft as the rotation center. When at different installation angles, the two groups of holes for passing screws on the traveling box housing, that is, the through holes, do not exceed the range of the connecting holes in the up-down, left-right directions. That is, the connecting holes should have sufficient width and height, so that even when the installation angle is different, the same group of screws still mate and connect with the same group of traveling box connection interface structures. Therefore, the part structure is simple, and when changing the installation angle, the threaded block does not need large position changes, and the disassembly and assembly are convenient.

[0083] The present invention also discloses a method for adjusting the height position of the fuselage of a very thin coal seam shearer. This method is based on the following installation structure of the traveling box system: detachably fix the traveling box housing of any one of the above-mentioned traveling systems for a very thin coal seam shearer to the fuselage of the shearer, make the front side wall of the traveling box housing fit against the rear side wall of the fuselage, and use a pin structure to position between the fitting surfaces. When it is necessary to raise the position of the fuselage or increase the coal passing height, keep the axis position of the drive wheel shaft unchanged, swing the traveling box housing at a small angle, so that the axis of the traveling wheel shaft moves downward relative to the axis of the drive wheel shaft and then re-fix it, as Figure 23 shown. On the contrary, make the axis of the traveling wheel shaft move upward relative to the axis of the drive wheel shaft and then re-fix it, as Figure 1 shown. For a determined traveling system, the swing angle size of the traveling box housing during adjustment is determined according to the planned adjustment amount of the fuselage height position.

[0084] Adopting this adjustment method, the height position of the shearer can be directly adjusted on the use site, which is very beneficial for the situation where it is necessary to temporarily increase the mining height or there are large rocks under the fuselage that need to pass through, and can greatly improve the adaptability of the shearer with a low fuselage in thin coal seams.

Claims

1. An extremely thin coal seam shearer traveling system, characterized in that: It includes a walking box housing, driving wheels, driving wheel shafts, walking wheel assemblies, walking wheel shafts, and guiding slide shoes. The walking wheel shafts and the driving wheel shafts are both rotatably supported on the front and rear side walls of the walking box housing. A large gear in the walking wheel assembly is coaxially and fixedly connected to the walking wheel. The walking wheel is coaxially installed on the walking wheel shaft. The driving wheel is coaxially fixed on the driving wheel shaft. The large gear is externally meshed with the driving wheel. The guiding slide shoe includes a base and an ear seat located above the base. The base includes a front side wall, a rear side wall, and a top plate connected between the tops of the front and rear side walls. Hooks are provided at the bottoms of the front side wall or the rear side wall. At the left and right ends of the base, a left-right extending guiding groove is respectively formed by the front side wall, the top plate, the rear side wall, and the hook. The guiding slide shoe is installed at the lower part of the walking box housing and is swingably connected to the walking box housing through an ear hole on its ear seat. The axis of the walking wheel shaft coincides with the center line of the ear hole. The guiding slide shoe is provided with a recessed surface recessed inwardly towards the inside of the base on each of the left and right sides. The recessed surface is located at least at one of the positions among the left and right side surfaces of the ear seat, the left and right top surfaces of the base separated by the ear seat, and the transition joints between the left and right sides of the ear seat and the top surface of the base. The driving wheel shaft is arranged radially close to the recessed surface. In the left-right direction, the driving wheel shaft is located between the ear seat and one of the guiding grooves.

2. The walking system of the ultra-thin coal seam shearer according to claim 1, characterized in that: The front side wall and the rear side wall of the base are both left-right continuous structures. The ear seat is a double-ear seat, including a front ear seat and a rear ear seat. The front ear seat and the rear ear seat are respectively connected to the inner sides of the front side wall and the rear side wall of the walking box housing. When the hook is connected to the front side wall of the base, the large gear is arranged on the front side of the walking wheel. When the hook is connected to the rear side wall of the base, the large gear is arranged on the rear side of the walking wheel.

3. The walking system of the ultra-thin coal seam shearer according to claim 1, characterized in that: The front side wall of the base is a left-right continuous structure, and the rear side wall of the base is a structure disconnected in the middle in the left-right direction. The ear seat only has a front ear seat. A support plate extending rearward is provided at the top of the front ear seat. The hook is connected to the front side wall of the base, and the front ear seat is connected to the inner side of the front side wall of the walking box housing. The large gear is arranged on the front side of the walking wheel; or, the rear side wall of the base is a left-right continuous structure, and the front side wall of the base is a structure disconnected in the middle in the left-right direction. The ear seat only has a rear ear seat. A support plate extending forward is provided at the top of the rear ear seat. The hook is connected to the rear side wall of the base, and the rear ear seat is connected to the inner side of the rear side wall of the walking box housing. The large gear is arranged on the rear side of the walking wheel.

4. The traveling system of the ultra-thin coal seam shearer according to claim 2 or 3, characterized in that: The walking box housing includes a connecting plate, a transition seat, a retaining ring, and a gland. The connecting plate and the gland are fixedly connected to form a box structure that is closed on the front, rear, and upper sides. The drive wheel shaft is rotatably supported on the connecting plate and the gland by bearings. The retaining ring is sleeved on the drive wheel shaft and is fixed to the connecting plate from the inner side of the walking box housing to axially limit the front bearing. The transition seat is fixed to the connecting plate from the inner side of the walking box housing. The front and rear ends of the walking wheel shaft are respectively rotatably supported on the transition seat and the gland by bearings. When it comes to the connection between the front ear seat of the guiding sliding shoe and the walking box housing, a front shaft section that extends inwardly towards the inner side of the walking box housing is provided on the transition seat, and the front shaft section is in shaft-hole fit with the front ear seat hole. When it comes to the connection between the rear ear seat of the guiding sliding shoe and the walking box housing, a rear shaft section that extends inwardly towards the inner side of the walking box housing is provided on the gland, and the rear shaft section is in shaft-hole fit with the rear ear seat hole.

5. The walking system of the ultra-thin coal seam shearer according to claim 4, characterized in that: The connecting plate is a vertical plate. The gland includes a horizontal plate portion and a vertical plate portion. The front end of the horizontal plate portion and the upper part of the connecting plate are positioned by one plane and two pins. The rear ends of the drive wheel shaft and the walking wheel shaft are both installed on the vertical plate portion. The top surface of the connecting plate is provided with a connecting plate top inclined surface that is higher at the front and lower at the rear. The top surface of the horizontal plate is provided with a gland top inclined surface that is higher at the front and lower at the rear.

6. The walking system of the ultra-thin coal seam shearer according to claim 5, characterized in that: A plurality of through holes that penetrate the connecting plate and the gland in the front-rear direction are provided on the walking box housing.

7. The walking system of the ultra-thin coal seam shearer according to claim 1, 2 or 3, characterized in that: The ear hole is a waist-shaped hole that is wider left and right and narrower up and down.

8. The walking system of the ultra-thin coal seam shearer according to claim 4, characterized in that: The ear hole is a waist-shaped hole that is wider left and right and narrower up and down.

9. The walking system of the ultra-thin coal seam shearer according to claim 1, 2 or 3, characterized in that: The concave surface is a straight cylindrical surface, and the generatrix of this straight cylindrical surface extends in the front-rear direction.

10. The walking system of the ultra-thin coal seam shearer according to claim 4, characterized in that: The concave surface is a straight cylindrical surface, and the generatrix of this straight cylindrical surface extends in the front-rear direction.

11. The walking system of the ultra-thin coal seam shearer according to claim 1, 2 or 3, characterized in that: The drive wheel and the drive wheel shaft are of an integral structure.

12. The walking system of the ultra-thin coal seam shearer according to claim 4, characterized in that: The drive wheel and the drive wheel shaft are of an integral structure.

13. The walking system of the ultra-thin coal seam shearer according to claim 1, 2 or 3, characterized in that: The large gear is splined to the walking wheel and is fixed to each other axially. The walking wheel is sleeved on the walking wheel shaft. The axial middle part of the walking wheel is splined to the walking wheel shaft, and there is a clearance fit between the two ends of the walking wheel and the walking wheel shaft in the shaft-hole.

14. The walking system of the ultra-thin coal seam shearer according to claim 4, characterized in that: The large gear is splined to the walking wheel and is fixed to each other axially. The walking wheel is sleeved on the walking wheel shaft. The axial middle part of the walking wheel is splined to the walking wheel shaft, and there is a clearance fit between the two ends of the walking wheel and the walking wheel shaft in the shaft-hole.

15. Installation structure of a walking system for a coal shearer in an extremely thin coal seam, characterized in that: Comprising the fuselage of a shearer and the walking system of an ultra-thin coal seam shearer according to any one of claims 1-14, on the rear side wall of the fuselage, there are provided two sets of walking box connection interface structures on the left and right. Each set of walking box connection interface structures includes a lateral groove and a connection hole extending in the front-back direction. The lateral groove has at least one rear groove wall extending to the notch and perpendicular to the connection hole. The front end of the connection hole extends to the rear groove wall and communicates with the lateral groove. The front side wall of the walking box housing fits against the rear side wall of the fuselage, and the two are positioned by a pin structure. The walking box housing is fixed to the fuselage by two sets of screws on the left and right. The two sets of screws are respectively inserted into the two connection holes on the left and right. The heads of the screws press on the walking box housing. The tail of each set of screws is threadedly connected to a threaded block. The two threaded blocks on the left and right respectively abut against the two rear groove walls. The walking box housing has multiple different installation angle positions with the axis of the drive wheel shaft as the rotation center. When at different installation angles, the two sets of holes for passing screws on the walking box housing do not exceed the range of the connection holes in the up-down, left-right directions.

16. A method for adjusting the height position of the body of a coal shearer for extremely thin coal seams, characterized in that: Based on the following installation structure of the walking box system, the walking box housing of the walking system of an ultra-thin coal seam shearer according to any one of claims 1-14 is detachably fixed to the fuselage of the shearer, so that the front side wall of the walking box housing fits against the rear side wall of the fuselage, and a pin structure is used for positioning between the fitting surfaces. When it is necessary to move the position of the fuselage upward or increase the coal passing height, keeping the axis position of the drive wheel shaft unchanged, the walking box housing is swung at a small angle, so that the axis of the walking wheel shaft moves downward relative to the axis of the drive wheel shaft and is fixed again. Conversely, the axis of the walking wheel shaft moves upward relative to the axis of the drive wheel shaft and is fixed again.

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