Walking wheel assembly of thin ore seam mining machine

Abstract

The present invention relates to a traveling wheel assembly of a thin ore seam mining machine, which includes a bushing, a traveling wheel and a large gear sleeved on the bushing. The inner holes of the traveling wheel and the large gear are respectively stepped holes with a smaller left and a larger right and a smaller right and a larger left. A left roller group is arranged between the smaller inner hole section of the traveling wheel and the bushing, and a right roller group is arranged between the smaller inner hole section of the large gear and the bushing. Two rows of axially loaded bearings are provided between the larger inner hole sections of the traveling wheel, the larger inner hole section of the large gear and the bushing. The left end of the left roller group is axially positioned by sleeving and installing a left end cover at the left end of the bushing or by providing a left traveling wheel edge integrally formed with the traveling wheel at the left end of the left roller group. The right end of the right roller group is axially positioned by sleeving and installing a right end cover at the right end of the bushing or by providing a right large gear edge integrally formed with the large gear at the right end of the right roller group. The present invention can withstand large radial and axial forces and improve the adaptability when the wear-resistant layer on the contact surface between the guiding sliding shoe and the track is excessively worn.

Description

Technical Field

[0001] The invention relates to a mining machine travel wheel assembly, which is particularly suitable for the travel system of a thin-layer mining machine, especially when the travel wheel assembly is subjected to a large axial force after the wear-resistant layer of a guide sliding shoe is excessively worn, and belongs to the technical field of underground mining machinery. Background Art

[0002] The travel system of thin-layer mining machines usually requires a smaller diameter. The structural design of the travel wheel assembly has evolved from the two-piece spherical roller bearing or one-piece double-row roller bearing structure commonly used in the travel wheel assembly of medium-thick or thin-layer mining machines to a multi-row roller structure (see Figure 5 ). Since the roller structure eliminates the conventional inner and outer rings compared to the bearings of ordinary structures, and directly uses the inner hole 131 of the running wheel 1 and the outer cylindrical surface of the sleeve 9 as the outer and inner raceways of the roller 7, the radial dimension can be reduced to adapt to the supporting rolling of the small-sized running wheel 1 and the large gear 2. However, when the guide shoe, which is arranged on the periphery of the running wheel assembly and sleeved on the outside of the track and is supposed to provide a guarantee for the good meshing between the running wheel assembly and the track, continues to be used after its wear-resistant layer is excessively worn, it restricts the further axial stringing of the running wheel assembly, causing the running wheel assembly to bear a large axial force. In this case, the roller 7, spacer, end cover, sleeve step and other side parts or structures in the running wheel assembly of the roller structure are in axial contact, and it is easy to fail due to wear, crushing, heat, etc., resulting in the overall failure of the running wheel assembly.

[0003] In response to the above problems, the common practice in the industry is to replace the guide shoes and / or tracks in time before the friction surface between the guide shoes and the corresponding tracks reaches the theoretical wear limit. Some mining areas also regularly replace, inspect and repair the guide shoes and disassemble and inspect the travel wheel assembly. However, this maintenance method leads to high costs in time and spare parts loss. What is more serious is that when there are a large number of hard rock interlayers or faults in the working face of the mined ore layer, it is basically impossible to accurately predict or directly detect the amount of wear, resulting in overall damage to the travel wheel assembly. Some even damage the installation holes of the travel wheel assembly on the travel box shell, resulting in greater losses and serious impacts on mining efficiency and mineral output. Summary of the invention

[0004] The purpose of the present invention is to provide a traveling wheel assembly for a thin-layer mining machine, which can not only adapt to the supporting rolling of small-sized traveling wheels and large gears, but also withstand larger radial and axial forces, thereby improving the adaptability of the traveling wheel assembly when the wear-resistant layer of the contact surface between the guide shoe and the track is excessively worn.

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

[0006] A traveling wheel assembly of a thin ore seam mining machine, comprising a bushing, a traveling wheel and a large gear sleeved on the left and right parts of the bushing respectively. The traveling wheel and the large gear are in left-right contact and fixedly connected. The inner hole of the traveling wheel is a stepped hole with a smaller left part and a larger right part, and the inner hole of the large gear is a stepped hole with a smaller right part and a larger left part. A left roller set is arranged between the smaller inner hole section of the traveling wheel and the bushing. The smaller inner hole section of the traveling wheel and the left journal of the bushing respectively provide an outer raceway and an inner raceway for the left roller set. A right roller set is arranged between the smaller inner hole section of the large gear and the bushing. The smaller inner hole section of the large gear and the right journal of the bushing respectively provide an outer raceway and an inner raceway for the right roller set. Each of the left roller set and the right roller set is composed of a plurality of rollers. Two rows of axially loaded bearings are arranged between the larger inner hole section of the traveling wheel, the larger inner hole section of the large gear and the bushing. The traveling wheel and the large gear are rotationally supported on the bushing through the left roller set, two rows of axially loaded bearings and the right roller set. The left end of the left roller set is axially positioned by sleeving and installing a left end cover on the left end of the bushing or by providing a left traveling wheel edge integrated with the traveling wheel at the left end of the left roller set. The right end of the right roller set is axially positioned by sleeving and installing a right end cover on the right end of the bushing or by providing a right large gear edge integrated with the large gear at the right end of the right roller set. The left end cover and the right end cover are respectively fixed relative to the traveling wheel and the large gear. The left end cover or the left traveling wheel edge, the right end cover or the right large gear edge are respectively rotationally sealed with the bushing.

[0007] The two rows of axially loaded bearings may include a left support sleeve, a right support sleeve and two rows of axially loaded rolling element and cage assemblies. An annular step is provided in the middle of the bushing. The annular step axially separates the two rows of axially loaded rolling element and cage assemblies. The left support sleeve and the right support sleeve are fixedly installed side by side on the left and right in the larger inner hole section of the traveling wheel and the larger inner hole section of the large gear. The left support sleeve and the right support sleeve are in mutual contact. The left end of the left support sleeve is axially positioned by the step surface between the larger inner hole section and the smaller inner hole section of the traveling wheel. The right end of the right support sleeve is axially positioned by the step surface between the larger inner hole section and the smaller inner hole section of the large gear. The left support sleeve is provided with a left support sleeve edge, and the right support sleeve is provided with a right support sleeve edge. The two rows of axially loaded rolling element and cage assemblies, the left support sleeve edge, the right support sleeve edge and the annular step form two rows of thrust bearings on the left and right. Among them, the left support sleeve edge and the right support sleeve edge respectively act as the raceways of the thrust bearings, and the annular step acts as the shaft ring of the thrust bearing. The right end of the left roller set is axially positioned by the left support sleeve edge, and the left end of the right roller set is axially positioned by the right support sleeve edge.

[0008] An oil injector and an oil drainer are installed on the left end cover or the traveling wheel. An oil hole for the traveling wheel is provided inside the entity of the traveling wheel. An oil injector and an oil drainer are installed on the right end cover or the large gear. An oil hole for the large gear is provided inside the entity of the large gear. An oil hole for the left support sleeve and an oil hole for the right support sleeve are respectively provided inside the left support sleeve and the right support sleeve. The outlet of the oil injector on the left end cover or the traveling wheel is sequentially communicated with the space to the right of the left retaining edge of the support sleeve through the oil hole for the traveling wheel and the oil hole for the left support sleeve. The outlet of the oil injector on the right end cover or the large gear is sequentially communicated with the space to the left of the right retaining edge of the support sleeve through the oil hole for the large gear and the oil hole for the right support sleeve. A radial clearance is left between each of the left retaining edge of the support sleeve and the right retaining edge of the support sleeve and the bushing. The inlet of the oil drainer on the left end cover or the traveling wheel is communicated with the left end of the space to the right of the left retaining edge of the traveling wheel. The inlet of the oil drainer on the right end cover or the large gear is communicated with the right end of the space to the left of the right retaining edge of the large gear.

[0009] An oil groove with a wide width for the bushing can be provided on the inner hole wall of the bushing. An oil hole for the left of the bushing, an oil hole for the middle of the bushing, and an oil hole for the right of the bushing are provided inside the entity of the bushing. The oil hole for the left of the bushing communicates the oil groove with a wide width for the bushing and the radial clearance between the left retaining edge of the support sleeve and the bushing. The oil hole for the right of the bushing communicates the oil groove with a wide width for the bushing and the radial clearance between the right retaining edge of the support sleeve and the bushing. One end of the oil hole for the middle of the bushing opens on the top surface of the annular step, and the other end is communicated with the oil groove with a wide width for the bushing.

[0010] Preferably, the oil injector and the oil drainer provided on the same part or structure are circumferentially offset by 180 degrees.

[0011] Preferably, the diameters of the larger inner hole sections of the traveling wheel and the large gear are equal, and the diameters of the smaller inner hole sections of the traveling wheel and the large gear are equal.

[0012] Each of the left roller group and the right roller group has two rows, and spacers can be respectively provided between the two rows of the left roller group and between the two rows of the right roller group.

[0013] Preferably, an axially protruding connecting tooth for the traveling wheel is provided on the right end face of the traveling wheel, and an axially protruding connecting tooth for the large gear is correspondingly provided on the left end face of the large gear. The connecting tooth for the traveling wheel and the connecting tooth for the large gear are embedded with each other.

[0014] The beneficial effects of the present invention are:

[0015] In the present invention, a left roller group, two rows of axially loaded bearings, and a right roller group are axially arranged in sequence in the annular space between the inner holes of the walking wheels and the large gears fixedly connected on the left and right and the outer cylindrical surface of the bushing, separating the radial load and the axial load. The axially loaded bearings only bear axial forces, and the left roller group and the right roller group only bear radial forces, avoiding the situation where the end faces of the rollers are worn due to force when the wear-resistant layer of the contact surface between the guiding slide shoe and the track is excessively worn. Correspondingly, the walking wheel assembly will not be rendered ineffective as a whole due to the wear of the roller end faces. Therefore, the service life of the walking wheel assembly can be greatly improved, the time for troubleshooting and maintenance can be reduced, and the use cost can be lowered. The present invention has a small and compact radial dimension, can adapt to the support and rolling of small-sized walking wheels and large gears, and at the same time obtains a large radial load-bearing capacity and axial load-bearing capacity, and can solve the adaptability problem of the walking wheel assembly when the wear-resistant layer of the contact surface between the guiding slide shoe and the track is excessively worn.

[0016] By providing an assembly oil injection channel system, it can be ensured that there is sufficient lubricating grease in the respective installation spaces of the left roller group, two rows of axially loaded bearings, and the right roller group before the assembly of the present invention is completed; by providing a maintenance oil injection channel system, it can be ensured that there is still sufficient lubricating grease in the respective installation spaces of the left roller group, two rows of axially loaded bearings, and the right roller group under the working state of the present invention, so that the left roller group, two rows of axially loaded bearings, and the right roller group can all maintain a good lubrication state.

[0017] Compared with the existing structure, since the present invention only optimizes the structure inside the walking wheel assembly and has good overall interchangeability with the existing structure of the walking wheel assembly, the present invention can be used to replace a large number of existing structures under harsh working conditions to achieve upgrade and improvement. Description of the Drawings

[0018] Figure 1 It is a cross-sectional view of an embodiment of the walking wheel assembly of the thin seam mining machine of the present invention;

[0019] Figure 2 It is a partial cross-sectional view of an embodiment of the walking wheel assembly of the thin seam mining machine of the present invention;

[0020] Figure 3 It is a schematic diagram of the oil injection channels and flow directions during the assembly of the walking wheel assembly of the thin seam mining machine of the present invention;

[0021] Figure 4 It is a schematic diagram of the oil injection channels and flow directions during the maintenance of the walking wheel assembly of the thin seam mining machine of the present invention under the working state;

[0022] Figure 5 It is a cross-sectional view of the walking wheel assembly of the existing structure.

[0023] Reference Signs:

[0024] 1. Traveling wheel; 11. Oil injector; 12. Oil drainer; 131. Inner hole of traveling wheel; 135. Connecting teeth of traveling wheel; 136. Oil hole of traveling wheel;

[0025] 2. Large gear; 25. Connecting teeth of large gear; 26. Oil hole of large gear;

[0026] 3. Screw;

[0027] 4. Left support sleeve; 45. Oil hole of left support sleeve;

[0028] 6. Right support sleeve; 65. Oil hole of right support sleeve;

[0029] 7. Roller;

[0030] 8. Axially loaded bearing;

[0031] 9. Bush; 92. Annular step; 93. Wide oil groove of bush; 94. Oil hole of bush. Detailed implementation mode

[0032] The present invention discloses a traveling wheel assembly of a thin ore layer mining machine, as Figures 1-4As shown, it includes a bushing 9, a traveling wheel 1 and a large gear 2 sleeved on the left and right parts of the bushing respectively. The traveling wheel and the large gear are in left and right contact and fixedly connected, for example, they can be fixed by axially inserting screws 3. The inner hole of the traveling wheel is set as a stepped hole with a smaller left part and a larger right part, and the inner hole of the large gear is set as a stepped hole with a smaller right part and a larger left part. A left roller group is arranged between the smaller inner hole section of the traveling wheel and the bushing. The smaller inner hole section of the traveling wheel and the left journal of the bushing respectively provide an outer raceway and an inner raceway for the left roller group. A right roller group is arranged between the smaller inner hole section of the large gear and the bushing. The smaller inner hole section of the large gear and the right journal of the bushing respectively provide an outer raceway and an inner raceway for the right roller group. Each of the left roller group and the right roller group is composed of several rollers 7. Two rows of axially loaded bearings 8 (including thrust bearings and radial bearings capable of bearing a certain axial load) are arranged between the larger inner hole section of the traveling wheel, the larger inner hole section of the large gear and the bushing. The traveling wheel and the large gear are rotationally supported on the bushing through the left roller group, two rows of axially loaded bearings and the right roller group. The left end of the left roller group is axially positioned by sleeving and installing a left end cover on the left end of the bushing or by providing a left traveling wheel edge integrally formed with the traveling wheel at the left end of the left roller group. The right end of the right roller group is axially positioned by sleeving and installing a right end cover on the right end of the bushing or by providing a right large gear edge integrally formed with the large gear at the right end of the right roller group. When the left end cover and the right end cover are adopted, the left and right end covers are respectively fixed relative to the traveling wheel and the large gear. The embodiment shown in the drawing adopts the left traveling wheel edge and the right large gear edge. The left end cover or the left traveling wheel edge, the right end cover or the right large gear edge are rotationally sealed with the bushing respectively. The left end cover or the left traveling wheel edge, the right end cover or the right large gear edge axially enclose the successively arranged left roller group, two rows of axially loaded bearings and the right roller group between the inner hole of the traveling wheel, the inner hole of the large gear and the outer cylindrical surface of the bushing and provide axial positioning for them. The traveling wheel and the large gear can rotate freely relative to the bushing.

[0033] In the present invention, the radial force and the axial force are separated. The axially loaded bearings only bear the axial force, and the left roller group and the right roller group only bear the radial force, avoiding the problem of wear on the roller end faces. When the wear-resistant layer on the contact surface between the guide shoe and the track is excessively worn, the traveling wheel assembly will not be rendered ineffective as a whole due to the wear of the roller end faces. Therefore, the service life of the traveling wheel assembly can be greatly improved, the time for troubleshooting and maintenance can be reduced, and the use cost can be lowered.

[0034] In the present invention, with a relatively small radial space, not only a small-diameter traveling wheel assembly is realized, but also a relatively large radial load-bearing capacity and axial load-bearing capacity are obtained.

[0035] The two axially loaded bearings may include a left support sleeve 4, a right support sleeve 6, and two sets of axially loaded rolling elements and cage assemblies. An annular step 92 is provided in the middle of the sleeve, and the annular step axially separates the two sets of axially loaded rolling elements and cage assemblies. The left support sleeve and the right support sleeve are fixedly installed side by side on the larger inner hole section of the walking wheel and the larger inner hole section of the large gear. The left support sleeve and the right support sleeve are in contact with each other. The left end of the left support sleeve is axially positioned by the step surface between the larger inner hole section and the smaller inner hole section of the walking wheel, and the right end of the right support sleeve is axially positioned by the step surface between the larger inner hole section and the smaller inner hole section of the large gear. A left support sleeve left edge is provided at the left end of the left support sleeve, and a right support sleeve right edge is provided at the right end of the right support sleeve. The two sets of axially loaded rolling elements and cage assemblies, the left support sleeve left edge, the right support sleeve right edge, and the annular step form two sets of thrust bearings on the left and right. Among them, the left support sleeve left edge and the right support sleeve right edge respectively act as the raceways of the thrust bearings, and the annular step acts as the shaft ring of the thrust bearing. At the same time, the right end of the left roller group is axially positioned by the left support sleeve left edge, and the left end of the right roller group is axially positioned by the right support sleeve right edge.

[0036] The left support sleeve is fixed relative to the larger inner hole section of the walking wheel, for example, in a tight fit with the larger inner hole section of the walking wheel. The right support sleeve is fixed relative to the larger inner hole section of the large gear, for example, in a tight fit with the larger inner hole section of the large gear.

[0037] An oil injector 11 and an oil drainer 12 are installed on the left end cover or the walking wheel. An oil hole 136 of the walking wheel is provided in the solid of the walking wheel. An oil injector 11 and an oil drainer 12 are installed on the right end cover or the large gear. An oil hole 26 of the large gear is provided in the solid of the large gear. Left support sleeve oil holes 45 and right support sleeve oil holes 65 are respectively provided in the left support sleeve and the right support sleeve. In this embodiment, the openings of the left support sleeve oil holes and the right support sleeve oil holes on the inner sides of the left and right support sleeves are respectively on the inner hole walls of the left and right support sleeves. The outlet of the oil injector on the left end cover or the walking wheel is sequentially communicated with the space to the right of the left support sleeve left edge through the oil hole 136 of the walking wheel and the left support sleeve oil hole 45. The outlet of the oil injector on the right end cover or the large gear is sequentially communicated with the space to the left of the right support sleeve right edge through the oil hole 26 of the large gear and the right support sleeve oil hole 65. A radial clearance is left between each of the left support sleeve left edge and the right support sleeve right edge and the sleeve. The grease injected from the oil injector first enters the installation space of the axially loaded bearing, and then enters the installation spaces of the left and right roller groups through the gaps between the left and right support sleeve edges and the sleeve. The inlet of the oil drainer on the left end cover or the walking wheel is communicated with the left end of the space to the right of the left edge of the walking wheel. The inlet of the oil drainer on the right end cover or the large gear is communicated with the right end of the space to the left of the right edge of the large gear. The grease in the installation spaces of the left and right roller groups is finally discharged through the oil drainer.

[0038] The oil injector 11 on the left end cover or the left edge of the traveling wheel, the traveling wheel oil hole 136, the left support sleeve oil hole 45, the installation space for the axially loaded bearing, the radial clearance between the left edge of the support sleeve and the shaft sleeve, the installation space for the left roller group, and the oil drainer 12 on the left end cover or the left edge of the traveling wheel form the left assembly oil injection oil passage system. The oil injector 11 on the right end cover or the right edge of the traveling wheel, the large gear oil hole 26, the right support sleeve oil hole 65, the installation space for the axially loaded bearing, the radial clearance between the right edge of the support sleeve and the shaft sleeve, the installation space for the right roller group, and the oil drainer 12 on the right end cover or the right edge of the large gear form the right assembly oil injection oil passage system. The settings of the left assembly oil injection oil passage system and the right assembly oil injection oil passage system can ensure that there is sufficient lubricating grease in the installation spaces of the left roller group, the axially loaded bearing, and the right roller group before the assembly of the present invention is completed.

[0039] Further, a wide oil groove 93 of the shaft sleeve is provided on the inner hole wall of the shaft sleeve, and a left oil hole of the shaft sleeve, a middle oil hole of the shaft sleeve, and a right oil hole of the shaft sleeve are provided in the solid of the shaft sleeve, which can be collectively referred to as the shaft sleeve oil hole 94. Multiple shaft sleeve oil holes can be provided along the circumferential direction. The left oil hole of the shaft sleeve communicates with the wide oil groove of the shaft sleeve and the radial clearance between the left edge of the support sleeve and the shaft sleeve, the right oil hole of the shaft sleeve communicates with the wide oil groove of the shaft sleeve and the radial clearance between the right edge of the support sleeve and the shaft sleeve, and one end of the middle oil hole of the shaft sleeve opens on the top surface of the annular step, and the other end communicates with the wide oil groove of the shaft sleeve. In the embodiment shown in the drawings, the wide oil groove 93 of the shaft sleeve is provided with three independent sections corresponding to the left oil hole of the shaft sleeve, the middle oil hole of the shaft sleeve, and the right oil hole of the shaft sleeve respectively.

[0040] The lubricating oil passage in the traveling wheel shaft cooperating with the shaft sleeve communicates with the wide oil groove 93 of the shaft sleeve. The lubricating oil passage in the traveling wheel shaft, the wide oil groove 93 of the shaft sleeve, the shaft sleeve oil hole 94, the radial clearances between the left edge of the support sleeve and the shaft sleeve and between the right edge of the support sleeve and the shaft sleeve respectively, the annular clearance between the top surface of the annular step and the left and right support sleeves, the installation space for the axially loaded bearing, the installation spaces for the left and right roller groups, and the oil drainer 12 form the maintenance oil injection oil passage system. The setting of the maintenance oil injection oil passage system can ensure that there is still sufficient lubricating grease in the installation spaces of the axially loaded bearing and the left and right roller groups when the present invention is in the working state, so that the left roller group, the two rows of axially loaded bearings, and the right roller group maintain a good lubrication state.

[0041] The oil injector and the oil drainer installed on the same part are preferably arranged with a circumferential difference of 180 degrees, so that the lubricating grease passes through the longest possible path and fills all the voids in the installation spaces of the left roller group, the right roller group, and the two rows of axially loaded bearings as much as possible. The oil injector and the oil drainer can adopt existing oil cups.

[0042] The following optimizations can also be carried out for the above-mentioned traveling wheel assembly of the thin seam mining machine:

[0043] The pore diameters and widths of the larger inner hole sections of the walking wheels and the larger inner hole sections of the large gears are preferably equal. Correspondingly, the left support sleeve and the right support sleeve can adopt a left-right symmetric structure. The pore diameters and widths of the smaller inner hole sections of the walking wheels and the smaller inner hole sections of the large gears are preferably equal. The left roller group and the right roller group can be composed of rollers with the same specifications and quantities.

[0044] A spacer can be provided between the left end of the left roller group and the left retaining edge of the walking wheel, and a spacer can also be provided between the right end of the right roller group and the right retaining edge of the large gear. The spacer can be used for the axial positioning of the left end of the left roller group and the right end of the right roller group, while avoiding the wear of the left and right end covers or the left retaining edge of the walking wheel and the right retaining edge of the large gear, and facilitating the adjustment of the axial installation dimensions and positions of the left and right roller groups.

[0045] The left roller group and the right roller group can be arranged in one row, or each can be arranged in two rows. When arranged in two rows, spacers are respectively provided between the two rows of the left roller group and between the two rows of the right roller group for axially limiting the two rows of rollers.

[0046] The right end face of the walking wheel can be provided with an axially protruding walking wheel connecting tooth 135. Correspondingly, the left end face of the large gear is also provided with an axially protruding large gear connecting tooth 25. The walking wheel connecting tooth and the large gear connecting tooth are embedded with each other to ensure a more reliable circumferential connection between the walking wheel and the large gear.

Claims

1. A traveling wheel assembly for a thin ore seam mining machine, characterized in that: It includes a bushing, a traveling wheel and a large gear sleeved on the left and right parts of the bushing respectively. The traveling wheel and the large gear are in left-right contact and fixedly connected. The inner hole of the traveling wheel is a stepped hole with a smaller left part and a larger right part, and the inner hole of the large gear is a stepped hole with a smaller right part and a larger left part. A left roller set is arranged between the smaller inner hole section of the traveling wheel and the bushing. The smaller inner hole section of the traveling wheel and the left journal of the bushing respectively provide an outer raceway and an inner raceway for the left roller set. A right roller set is arranged between the smaller inner hole section of the large gear and the bushing. The smaller inner hole section of the large gear and the right journal of the bushing respectively provide an outer raceway and an inner raceway for the right roller set. Each of the left roller set and the right roller set is composed of a number of rollers. Two columns of axially loaded bearings are arranged between the larger inner hole section of the traveling wheel, the larger inner hole section of the large gear and the bushing. The traveling wheel and the large gear are rotationally supported on the bushing through the left roller set, two columns of axially loaded bearings and the right roller set. The left end of the left roller set is axially positioned by sleeving and installing a left end cover on the left end of the bushing or by arranging a left traveling wheel edge integrated with the traveling wheel at the left end of the left roller set. The right end of the right roller set is axially positioned by sleeving and installing a right end cover on the right end of the bushing or by arranging a right large gear edge integrated with the large gear at the right end of the right roller set. The left end cover and the right end cover are respectively fixed relative to the traveling wheel and the large gear. The left end cover or the left traveling wheel edge, the right end cover or the right large gear edge are rotationally sealed with the bushing respectively. The two columns of axially loaded bearings include a left support sleeve, a right support sleeve and two columns of axially loaded rolling element and cage assemblies. An annular step is provided in the middle of the bushing. The annular step axially separates the two columns of axially loaded rolling element and cage assemblies. The left support sleeve and the right support sleeve are fixedly installed side by side left and right in the larger inner hole section of the traveling wheel and the larger inner hole section of the large gear. The left support sleeve and the right support sleeve are in mutual contact. The left end of the left support sleeve is axially positioned by the step surface between the larger inner hole section and the smaller inner hole section of the traveling wheel. The right end of the right support sleeve is axially positioned by the step surface between the larger inner hole section and the smaller inner hole section of the large gear. The left support sleeve is provided with a left support sleeve edge, and the right support sleeve is provided with a right support sleeve edge. The two columns of axially loaded rolling element and cage assemblies, the left support sleeve edge, the right support sleeve edge and the annular step form two columns of thrust bearings on the left and right. Among them, the left support sleeve edge and the right support sleeve edge respectively act as the raceways of the thrust bearings, and the annular step acts as the shaft ring of the thrust bearing. The right end of the left roller set is axially positioned by the left support sleeve edge, and the left end of the right roller set is axially positioned by the right support sleeve edge;An oil injector and an oil drainer are installed on the left end cover or the traveling wheel. An oil hole for the traveling wheel is provided inside the entity of the traveling wheel. An oil injector and an oil drainer are installed on the right end cover or the large gear. An oil hole for the large gear is provided inside the entity of the large gear. An oil hole for the left support sleeve and an oil hole for the right support sleeve are respectively provided inside the left support sleeve and the right support sleeve. The outlet of the oil injector on the left end cover or the traveling wheel is successively communicated with the space to the right of the left retaining edge of the support sleeve through the oil hole of the traveling wheel and the oil hole of the left support sleeve. The outlet of the oil injector on the right end cover or the large gear is successively communicated with the space to the left of the right retaining edge of the support sleeve through the oil hole of the large gear and the oil hole of the right support sleeve. A radial clearance is left between each of the left retaining edge of the support sleeve and the right retaining edge of the support sleeve and the bushing. The inlet of the oil drainer on the left end cover or the traveling wheel is communicated with the left end of the space to the right of the left retaining edge of the traveling wheel. The inlet of the oil drainer on the right end cover or the large gear is communicated with the right end of the space to the left of the right retaining edge of the large gear. ; 2. The traveling wheel assembly for a thin ore seam mining machine according to claim 1, characterized in that: A wide oil groove of the bushing is provided on the inner hole wall of the bushing, and a left oil hole of the bushing, a middle oil hole of the bushing and a right oil hole of the bushing are provided in the solid of the bushing. The left oil hole of the bushing communicates the wide oil groove of the bushing with the radial clearance between the left retaining edge of the support sleeve and the bushing, and the right oil hole of the bushing communicates the wide oil groove of the bushing with the radial clearance between the right retaining edge of the support sleeve and the bushing. One end of the middle oil hole of the bushing opens on the top surface of the annular step, and the other end communicates with the wide oil groove of the bushing.

3. The traveling wheel assembly for a thin ore seam mining machine according to claim 1 or 2, characterized in that: The oil injector and the oil drainer provided on the same part are circumferentially offset by 180 degrees.

4. The traveling wheel assembly for a thin ore seam mining machine according to claim 1 or 2, characterized in that: The diameters of the larger inner hole sections of the traveling wheel and the larger inner hole sections of the large gear are equal, and the diameters of the smaller inner hole sections of the traveling wheel and the smaller inner hole sections of the large gear are equal.

5. The traveling wheel assembly for a thin ore seam mining machine according to claim 3, characterized in that: The diameters of the larger inner hole sections of the traveling wheel and the larger inner hole sections of the large gear are equal, and the diameters of the smaller inner hole sections of the traveling wheel and the smaller inner hole sections of the large gear are equal.

6. The traveling wheel assembly for a thin ore seam mining machine according to claim 1 or 2, characterized in that: A spacer is respectively provided between the left end of the left roller group and the left end cover or the left retaining edge of the traveling wheel, and between the right end of the right roller group and the right end cover or the right retaining edge of the large gear.

7. The traveling wheel assembly for a thin ore seam mining machine according to claim 3, characterized in that: A spacer is respectively provided between the left end of the left roller group and the left end cover or the left retaining edge of the traveling wheel, and between the right end of the right roller group and the right end cover or the right retaining edge of the large gear.

8. The traveling wheel assembly for a thin ore seam mining machine according to claim 4, characterized in that: A spacer is respectively provided between the left end of the left roller group and the left end cover or the left retaining edge of the traveling wheel, and between the right end of the right roller group and the right end cover or the right retaining edge of the large gear.

9. The traveling wheel assembly for a thin ore seam mining machine according to claim 6, characterized in that: The left roller group and the right roller group each have two rows, and spacers are respectively provided between the two rows of the left roller group and between the two rows of the right roller group.

10. The traveling wheel assembly for a thin ore seam mining machine according to claim 1 or 2, characterized in that: The right end face of the traveling wheel is provided with axially protruding traveling wheel connecting teeth, and the left end face of the large gear is provided with axially protruding large gear connecting teeth, and the traveling wheel connecting teeth and the large gear connecting teeth are mutually embedded.

11. The traveling wheel assembly for a thin ore seam mining machine according to claim 6, characterized in that: The right end face of the traveling wheel is provided with axially protruding traveling wheel connecting teeth, and the left end face of the large gear is provided with axially protruding large gear connecting teeth, and the traveling wheel connecting teeth and the large gear connecting teeth are mutually embedded.

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