Compact traveling wheel set for thin coal seam shearer

Abstract

The present invention relates to a compact traveling wheel set for a thin coal seam shearer, which includes a bushing and a traveling wheel sleeved on the bushing. A left roller assembly, two rows of axially loaded bearings, and a right roller assembly are sequentially arranged between the two. A gland fixedly connected to the traveling wheel is sleeved on the right end of the bushing, and the gland axially positions the right roller assembly. The left roller assembly is axially positioned by sleeving an end cover on the left end of the bushing or by providing a rib integrated with the traveling wheel at the left end of the left roller assembly. The left roller assembly includes a left roller group and a left support sleeve, and the left support sleeve and the bushing respectively provide outer and inner raceways for the left roller group. The right roller assembly includes a right roller group and a right support sleeve, and the right support sleeve and the bushing respectively provide outer and inner raceways for the right roller group. The right and left ribs on the right and left support sleeves respectively provide right-end axial positioning and left-end positioning for the left and right roller groups. 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 coal mining machine travel wheel group, which is particularly suitable for the travel system of the thin coal seam coal mining machine, especially when the travel wheel group is subjected to a large axial force after the wear-resistant layer of the guide sliding shoe is excessively worn, and belongs to the technical field of underground coal mining machinery. Background Art

[0002] The traveling system of the thin coal seam coal mining machine usually requires a smaller diameter. The structural design of the traveling wheel group has evolved from the two-piece spherical roller bearing or one-piece double-row roller bearing structure commonly used in the traveling wheel group of the medium-thick or thin coal seam coal mining machine to a multi-row roller structure (see Figure 7 ). 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 walking 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 walking wheel 1 and the large gear 2. However, when the guide shoe, which is arranged on the periphery of the walking wheel group and sleeved on the outside of the track and should provide a guarantee for the good meshing between the walking wheel group and the track, continues to be used after its wear-resistant layer is excessively worn, it restricts the further axial stringing of the walking wheel group, causing the walking wheel group to bear a large axial force. In this case, the side parts or structures such as the roller 7, spacer, pressure cover 3, sleeve step, etc. in the walking wheel group 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 walking wheel group.

[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 mines also regularly replace, inspect and repair the guide shoes and disassemble and inspect the walking 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 on the working face of the mined coal seam, it is basically impossible to accurately predict or directly detect the amount of wear, resulting in overall damage to the walking wheel assembly. Some even damage the installation holes of the walking wheel assembly on the walking box shell, resulting in greater losses and serious impact on coal production. Summary of the invention

[0004] The purpose of the present invention is to provide a compact walking wheel group for a thin coal seam coal mining machine, which can not only adapt to the supporting rolling of small-sized walking wheels and large gears, but also withstand larger radial and axial forces, thereby improving the adaptability of the walking wheel group 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 compact walking wheel assembly for a thin coal seam coal mining machine comprises a walking wheel and a shaft sleeve, wherein the walking wheel is sleeved on the shaft sleeve, and a left roller assembly, two rows of axial force bearings and a right roller assembly are sequentially arranged from left to right between the walking wheel and the shaft sleeve, a gland is sleeved on the right end of the shaft sleeve, the gland is fixedly connected to the walking wheel, a rotary seal is arranged between the gland and the shaft sleeve, the gland is used to axially position the right roller assembly, and the left roller assembly is axially positioned by sleeved an end cap on the left end of the shaft sleeve or by arranging a retaining edge integrated with the walking wheel on the left end of the left roller assembly, and the end cap or retaining edge is connected to the shaft sleeve. A rotary seal is arranged between the wheels, the left roller assembly comprises a left roller group and a left supporting sleeve, the left supporting sleeve is fixed relative to the inner hole of the traveling wheel, the left supporting sleeve and the shaft sleeve respectively provide an outer raceway and an inner raceway for the left roller group, the right roller assembly comprises a right roller group and a right supporting sleeve, the right supporting sleeve is fixed relative to the inner hole of the traveling wheel, the right supporting sleeve and the shaft sleeve respectively provide an outer raceway and an inner raceway for the right roller group, the left supporting sleeve is provided with a right rib, the right supporting sleeve is provided with a left rib, the right rib and the left rib respectively provide right end axial positioning and left end axial positioning for the left roller group and the right roller group.

[0007] An intermediate support sleeve is also provided between the left support sleeve and the right support sleeve. The intermediate support sleeve is fixed relative to the inner hole of the traveling wheel. An annular step is provided in the middle of the sleeve. The two rows of axially force-bearing bearings are arranged in one of the following two structural types: 1. Two rows of axially force-bearing rolling elements and retaining frame assemblies are arranged between the intermediate support sleeve and the sleeve. The annular step axially separates the two rows of axially force-bearing rolling elements and retaining frame assemblies. The axially force-bearing rolling elements and retaining frame assemblies, the left rib, the right rib and the annular step constitute the left and right rows of thrust bearings, wherein the left rib and the right rib serve as the seat rings of the thrust bearings respectively, and the annular step serves as the shaft ring of the thrust bearing; 2. The two rows of axially force-bearing bearings adopt two sets of tapered roller bearings arranged symmetrically on the left and right sides. The outer rings of the two sets of tapered roller bearings are axially positioned by the intermediate support sleeve and the left and right support sleeves, and the inner rings of the two sets of tapered roller bearings are separated and axially positioned by the annular step.

[0008] For Structure Type I, left support sleeve oil grooves and right support sleeve oil grooves are respectively arranged axially on the outer cylindrical surfaces of the left support sleeve and the right support sleeve. Both the left support sleeve oil groove and the right support sleeve oil groove are through grooves. On the left end face of the left support sleeve and the right end face of the right support sleeve, at positions opposite to the left support sleeve oil groove and the right support sleeve oil groove, there are respectively a left support sleeve left notch and a right support sleeve right notch. Inside the right retaining edge and the left retaining edge, there are respectively a left support sleeve oil hole and a right support sleeve oil hole. The left support sleeve oil hole communicates with the left support sleeve oil groove and the space to the left of the right retaining edge, and the right support sleeve oil hole communicates with the right support sleeve oil groove and the space to the right of the left retaining edge. On the left end face and the right end face of the intermediate support sleeve, there are respectively a left oil groove and a right oil groove. One end of the left oil groove and the right oil groove extends to the outer cylindrical surface of the intermediate support sleeve, and the other end extends to the inner hole surface of the intermediate support sleeve. In the installed state, the left support sleeve oil groove communicates with the left oil groove, and the right support sleeve oil groove communicates with the right oil groove. There are gaps between the right retaining edge and the left retaining edge and the shaft sleeve. An oil injector and an oil drainer are installed on the end cover or the retaining edge, and an oil injector and an oil drainer are also installed on the gland. The outlet of the oil injector on the end cover or the retaining edge communicates with the left support sleeve oil groove through the left support sleeve left notch, and the inlet of the oil drainer communicates with the left end of the space to the left of the right retaining edge. The outlet of the oil injector on the gland communicates with the right support sleeve oil groove through the right support sleeve right notch, and the inlet of the oil drainer on the gland communicates with the right end of the space to the right of the left retaining edge.

[0009] An axially wide oil groove is provided on the inner hole wall of the shaft sleeve. Inside the shaft sleeve, there are a shaft sleeve left oil hole, a shaft sleeve middle oil hole, and a shaft sleeve right oil hole. The shaft sleeve left oil hole communicates with the axially wide oil groove and the gap between the right retaining edge and the shaft sleeve, and the shaft sleeve right oil hole communicates with the axially wide oil groove and the gap between the left retaining edge and the shaft sleeve. There is a gap between the annular step and the intermediate support sleeve. The shaft sleeve middle oil hole is located inside the annular step, and the shaft sleeve middle oil hole communicates with the axially wide oil groove and the gap between the annular step and the intermediate support sleeve.

[0010] For Structure Type II, left support sleeve oil grooves and right support sleeve oil grooves are respectively arranged axially on the outer cylindrical surfaces of the left support sleeve and the right support sleeve. Both the left support sleeve oil groove and the right support sleeve oil groove are through grooves. On the left end face and the right end face of the left support sleeve, at positions opposite to the left support sleeve oil groove, there are respectively a left support sleeve left notch and a left support sleeve right notch. On the left end face and the right end face of the right support sleeve, at positions opposite to the right support sleeve oil groove, there are respectively a right support sleeve left notch and a right support sleeve right notch. An oil injector and an oil drainer are installed on the end cover or the retaining edge, and an oil injector and an oil drainer are also installed on the gland. The outlet of the oil injector on the end cover or the retaining edge communicates with the left support sleeve oil groove through the left support sleeve left notch, and the inlet of the oil drainer communicates with the left end of the space to the left of the right retaining edge. The outlet of the oil injector on the gland communicates with the right support sleeve oil groove through the right support sleeve right notch, and the inlet of the oil drainer on the gland communicates with the right end of the space to the right of the left retaining edge.

[0011] A wide sleeve oil groove is provided on the inner hole wall of the sleeve, and a sleeve oil hole is provided in the body of the sleeve. One end of the sleeve oil hole opens on the top surface of the annular step, and the other end is connected to the wide sleeve oil groove.

[0012] The compact walking wheel group of the thin coal seam coal mining machine can also include a large gear. The left part of the walking wheel is a gear tooth section, and the right part is a spline shaft section. The large gear is sleeved on the spline section and is spline-connected to the walking wheel. The pressure cover is embedded from the right end from the outside to the inside between the large gear and the shaft sleeve to axially position and fix the right support sleeve and the large gear.

[0013] The beneficial effects of the present invention are:

[0014] The present invention separates radial force from axial force by sequentially arranging a left roller assembly, two rows of axial force bearings and a right roller assembly in the annular space between the inner hole of the running wheel and the outer cylindrical surface of the sleeve. The axial force bearing only bears axial force, and the left roller assembly and the right roller assembly only bear radial force, thereby avoiding the situation where the roller end faces are subjected to force wear when the wear-resistant layer of the contact surface between the guide shoe and the track is excessively worn. Accordingly, the running wheel set will not fail as a whole due to the wear of the roller end faces, thereby greatly improving the service life of the running wheel set, reducing the time for troubleshooting and maintenance, and reducing the cost of use. The present invention has a small and compact radial dimension, can adapt to the support and rolling of small-sized running wheels and large gears, and also obtains a large radial load-bearing capacity and axial load-bearing capacity, which can solve the adaptability problem of the running wheel set when the wear-resistant layer of the contact surface between the guide shoe and the track is excessively worn.

[0015] By setting up an assembly oil injection channel system, it can be ensured that there is sufficient lubricating grease in the radial annular space between the left support sleeve, the middle support sleeve and the right support sleeve and the shaft sleeve before assembly is completed; by setting up a maintenance oil injection channel system, it can be ensured that there is sufficient lubricating grease in the radial annular space between the left support sleeve, the middle support sleeve and the right support sleeve and the shaft sleeve in the working state, so that the left roller assembly, the two rows of axial force bearings and the right roller assembly are kept in a good lubrication state.

[0016] Compared with the existing structure, since the present invention only optimizes the structure inside the running wheel group, it has good overall interchangeability with the running wheel group of the existing structure, and can upgrade and improve a large number of existing structures in harsh working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A cross-sectional view of a first embodiment of a compact traveling wheel assembly for a thin coal seam shearer according to the present invention;

[0018] Figure 2 It is a partial cross-sectional view of a first embodiment of a compact traveling wheel assembly for a thin coal seam shearer according to the present invention;

[0019] Figure 3 Schematic diagram of the oil injection channel and flow direction during the assembly of the compact traveling wheel set of the shearer for thin coal seams according to the present invention;

[0020] Figure 4 Schematic diagram of the oil injection channel and flow direction during the maintenance of the working state of the compact traveling wheel set of the shearer for thin coal seams according to the present invention;

[0021] Figure 5 Cross-sectional view of the second embodiment of the compact traveling wheel set of the shearer for thin coal seams according to the present invention;

[0022] Figure 6 Cross-sectional view of the third embodiment of the compact traveling wheel set of the shearer for thin coal seams according to the present invention;

[0023] Figure 7 Cross-sectional view of the traveling wheel set of the existing structure.

[0024] Reference numerals:

[0025] 1. Traveling wheel; 11. Oil injector; 12. Oil drainer; 131. Inner hole of the traveling wheel;

[0026] 2. Large gear;

[0027] 3. Gland;

[0028] 4. Left support sleeve; 41. Oil hole of the left support sleeve; 46. Oil groove of the left support sleeve;

[0029] 5. Intermediate support sleeve; 51. Left oil groove; 52. Right oil groove;

[0030] 6. Right support sleeve; 61. Oil hole of the right support sleeve; 66. Oil groove of the right support sleeve;

[0031] 7. Roller;

[0032] 8. Axially loaded bearing;

[0033] 9. Bush; 92. Annular step; 93. Wide oil groove of the bush; 94. Oil hole of the bush. Detailed implementation manners

[0034] The present invention discloses a compact traveling wheel set for a shearer for thin coal seams, as Figure 1-6As shown, it includes a walking wheel 1 and a bushing 9. The walking wheel is sleeved on the bushing. Between the walking wheel and the bushing, there are successively arranged from left to right a left roller assembly, two rows of axially loaded bearings 8 (including thrust bearings and radial bearings capable of bearing a certain axial load), and a right roller assembly. A gland 3 is sleeved on the right end of the bushing. The gland is fixedly connected to the walking wheel, for example, by screws. A rotary seal is arranged between the gland and the bushing. The gland axially positions the right roller assembly. The left roller assembly is axially positioned by sleeving an end cover on the left end of the bushing or by providing a rib integrated with the walking wheel at the left end of the left roller assembly (this is the case in the embodiment shown in the attached drawings). A rotary seal is arranged between the end cover or the rib and the bushing. The end cover or the rib and the gland enclose the left roller assembly, the two rows of axially loaded bearings, and the right roller assembly between the inner hole of the walking wheel and the outer cylindrical surface of the bushing and provide axial positioning for them. The walking wheel can rotate freely relative to the bushing.

[0035] The left roller assembly includes a left roller group and a left support sleeve 4. The left support sleeve is fixed relative to the inner hole of the walking wheel, for example, in a tight fit with the inner hole of the walking wheel. The left support sleeve and the bushing respectively provide an outer raceway and an inner raceway for the left roller group. The right roller assembly includes a right roller group and a right support sleeve 6. The right support sleeve is fixed relative to the inner hole of the walking wheel, for example, in a tight fit with the inner hole of the walking wheel. The right support sleeve and the bushing respectively provide an outer raceway and an inner raceway for the right roller group. A right rib is provided on the right part of the left support sleeve, and a left rib is provided on the left part of the right support sleeve. The right rib and the left rib respectively provide right-end axial positioning and left-end axial positioning for the left roller group and the right roller group. Each of the left roller group and the right roller group is composed of a number of rollers 7. The annular spaces between the left support sleeve and the bushing and between the right support sleeve and the bushing respectively provide spaces for the left roller group and the right roller group to rotate and roll therein.

[0036] The present invention separates radial force and axial force. The axially loaded bearings only bear axial force, and the left and right roller assemblies only bear radial force, avoiding the problem of wear on the roller end faces. When the wear-resistant layer on the contact surface between the guiding shoe and the track is excessively worn, the walking wheel group will not fail as a whole due to the wear of the roller end faces. Therefore, the service life of the walking wheel group can be greatly improved, the time for troubleshooting and maintenance can be reduced, and the use cost can be lowered.

[0037] The present invention not only realizes a small-diameter walking wheel group with a smaller radial space, but also obtains a larger radial load-bearing capacity and axial load-bearing capacity.

[0038] An intermediate support sleeve 5 is arranged between the left support sleeve and the right support sleeve. The intermediate support sleeve is fixed relative to the inner hole of the walking wheel, for example, in a tight fit with the inner hole of the walking wheel. An annular step 92 is provided in the middle of the bushing for separating the two rows of axially loaded bearings.

[0039] The two rows of axially loaded bearings can be arranged in one of the following two structural forms:

[0040] 1. As shown in Figure 1 , 2 , 3, 4, and 6, two columns of axially loaded rolling elements and cage assemblies are arranged between the intermediate support sleeve and the bushing. The annular step axially separates the two columns of axially loaded rolling elements and cage assemblies. The axially loaded rolling elements and cage assemblies, together with the left retaining edge, the right retaining edge, and the annular step, form two columns of thrust bearings on the left and right. Among them, the left retaining edge and the right retaining edge respectively serve as the raceways of the thrust bearings, and the annular step serves as the shaft ring of the thrust bearing. The left support sleeve, the intermediate support sleeve, and the right support sleeve are in contact in sequence, and their axial positions are determined by their respective width dimensions, as well as the axial positions of the end cover or retaining edge and the gland.

[0041] 2. As shown in Figure 5 , two columns of axially loaded bearings are arranged symmetrically left and right with two sets of tapered roller bearings (facing each other in this embodiment). In this embodiment, the outer rings of the two sets of tapered roller bearings have no flanges, and the inner rings have double flanges. The outer rings are axially positioned by the intermediate support sleeve, the left support sleeve, and the right support sleeve. The inner rings of the two sets of tapered roller bearings are separated and axially positioned by the annular step. In structural type two, while the tapered roller bearings bear axial forces, they can assist in providing a certain amount of radial support, thereby improving the overall radial load-carrying capacity. Grinding the left and right end faces of the intermediate support sleeve and the annular step to achieve a specific width of the intermediate support sleeve and the annular step is the key to ensuring the load-carrying capacity of the tapered roller bearings. The left support sleeve, the outer ring of the left tapered roller bearing, the intermediate support sleeve, the outer ring of the right tapered roller bearing, and the right support sleeve are in contact in sequence, and their axial positions are determined by their respective width dimensions, as well as the axial positions of the end cover or retaining edge and the gland. In structural type two, the radial dimensions of the left retaining edge, the right retaining edge, and the annular step are smaller than those in structural type one.

[0042] For structural type one, left support sleeve oil grooves 46 and right support sleeve oil grooves 66 are respectively provided axially on the outer cylindrical surfaces of the left support sleeve and the right support sleeve. Both the left support sleeve oil grooves and the right support sleeve oil grooves are through grooves. Left support sleeve left notches and right support sleeve right notches are respectively provided at positions on the left end face of the left support sleeve and the right end face of the right support sleeve that are opposite to the left support sleeve oil grooves and the right support sleeve oil grooves. Left support sleeve oil holes 41 and right support sleeve oil holes 61 are respectively provided inside the right retaining edge and the left retaining edge. The left support sleeve oil holes communicate the left support sleeve oil grooves with the space to the left of the right retaining edge, and the right support sleeve oil holes communicate the right support sleeve oil grooves with the space to the right of the left retaining edge. Left oil grooves 51 and right oil grooves 52 are respectively provided on the left end face and the right end face of the intermediate support sleeve. One end of the left oil grooves and the right oil grooves extends to the outer cylindrical surface of the intermediate support sleeve, and the other end extends to the inner hole surface of the intermediate support sleeve. In the installed state, the left support sleeve oil grooves are communicated with the left oil grooves, and the right support sleeve oil grooves are communicated with the right oil grooves. There are gaps between the right retaining edge, the left retaining edge, and the bushing.

[0043] An oil injector 11 and an oil drainer 12 are installed on the end cover or the retaining edge, and an oil injector 11 and an oil drainer 12 are also installed on the gland. The outlet of the oil injector on the end cover or the retaining edge communicates with the oil groove of the left support sleeve through the left notch of the left support sleeve, and the inlet of the oil drainer communicates with the left end of the space to the left of the right retaining edge. The outlet of the oil injector on the gland communicates with the oil groove of the right support sleeve through the right notch of the right support sleeve, and the inlet of the oil drainer on the gland communicates with the right end of the space to the right of the left retaining edge. The oil injector 11 on the end cover or the retaining edge, the left notch of the left support sleeve, the oil groove 46 of the left support sleeve, the branch of the oil hole 41 of the left support sleeve and the branch of the gap between the left oil groove 51 and the sleeve plus the space to the left of the right retaining edge, and the oil drainer 12 on the end cover or the retaining edge constitute the left assembly oil injection oil passage system. The oil injector 11 on the gland, the right notch of the right support sleeve, the oil groove 66 of the right support sleeve, the branch of the oil hole 61 of the right support sleeve and the branch of the gap between the right oil groove 52 and the sleeve plus the space to the right of the left retaining edge, and the oil drainer 12 on the gland constitute the right assembly oil injection oil passage system. The setting 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 inside the radial annular space between the left support sleeve, the middle support sleeve and the right support sleeve and the sleeve respectively before the assembly of the present invention is completed.

[0044] As a preferred technical solution, the left oil groove and the right oil groove are through grooves extending radially along the middle support sleeve, and the left oil groove and the right oil groove are 180 degrees different in the circumferential direction. The oil injector and the oil drainer provided on the same part are 180 degrees different in the circumferential direction. The lubricating grease passes through the longest possible path and fills all the voids in the installation spaces of the left roller assembly, the right roller assembly and the two rows of axially loaded bearings as much as possible.

[0045] Further, a wide oil groove 93 of the bushing is also provided on the inner hole wall of the bushing. The solid of the bushing is provided with a left oil hole of the bushing, a middle oil hole of the bushing, and a right oil hole of the bushing, which can be collectively referred to as the oil holes 94 of the bushing. The left oil hole of the bushing communicates with the wide oil groove of the bushing and the gap between the right retaining edge and the bushing. The right oil hole of the bushing communicates with the wide oil groove of the bushing and the gap between the left retaining edge and the bushing. A gap is maintained between the annular step and the middle support sleeve. The middle oil hole of the bushing is located within the annular step. The middle oil hole of the bushing communicates with the wide oil groove of the bushing and the gap between the annular step and the middle support sleeve. A plurality of oil holes of the bushing can be provided along the circumferential direction. In the embodiment shown in the drawing, the wide oil groove 93 of the bushing is provided with three independent sections corresponding one by one to the left oil hole of the bushing, the middle oil hole of the bushing, and the right oil hole of the bushing. The lubricating oil passage in the running wheel shaft that cooperates with the bushing communicates with the wide oil groove 93 of the bushing. The lubricating oil passage in the running wheel shaft, the wide oil groove 93 of the bushing, and the oil holes 94 of the bushing, to the annular spaces between the left support sleeve, the middle support sleeve, and the right support sleeve and the bushing respectively, and then to the oil drainers 12 at both ends form a maintenance oil injection passage system. The setting of the maintenance oil injection passage system can ensure that there is still enough lubricating grease in the above three annular spaces when the present invention is in the working state, so that the left roller assembly, the two rows of axially stressed bearings, and the right roller assembly maintain a good lubrication state.

[0046] For the second structural type, left support sleeve oil grooves 46 and right support sleeve oil grooves 66 are respectively provided along the axial direction on the outer cylindrical surfaces of the left support sleeve and the right support sleeve. Both the left support sleeve oil groove and the right support sleeve oil groove are through grooves. Left support sleeve left notches and left support sleeve right notches are respectively provided at positions on the left end face and the right end face of the left support sleeve opposite to the left support sleeve oil groove. Right support sleeve left notches and right support sleeve right notches are respectively provided at positions on the left end face and the right end face of the right support sleeve opposite to the right support sleeve oil groove.

[0047] Similar to the first structural type, oil injectors 11 and oil drainers 12 are installed on the end cover or the retaining edge, and oil injectors 11 and oil drainers 12 are also installed on the gland. The outlet of the oil injector on the end cover or the retaining edge communicates with the left support sleeve oil groove through the left support sleeve left notch. The inlet of the oil drainer communicates with the left end of the space to the left of the right retaining edge. The outlet of the oil injector on the gland communicates with the right support sleeve oil groove through the right support sleeve right notch. The inlet of the oil drainer on the gland communicates with the right end of the space to the right of the left retaining edge. The oil injector 11 on the end cover or the retaining edge, the left support sleeve left notch, the left support sleeve oil groove 46, the left support sleeve right notch, the installation space of a set of tapered roller bearings on the left side, the installation space of the left roller assembly, and the oil drainer 12 on the end cover or the retaining edge constitute a left assembly oil injection passage system. The oil injector 11 on the gland, the right support sleeve right notch, the right support sleeve oil groove 66, the right support sleeve left notch, the installation space of a set of tapered roller bearings on the right side, the installation space of the right roller assembly, and the oil drainer 12 on the gland constitute a right assembly oil injection passage system.

[0048] Similarly, the oil injector and the oil drainer provided on the same part are preferably 180 degrees apart in the circumferential direction.

[0049] The oil injector and the oil drainer may adopt existing oil cups.

[0050] Further, a wide oil groove 93 of the bushing is provided on the inner hole wall of the bushing, and an oil hole 94 of the bushing is provided in the solid body of the bushing. One end of the 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. The lubricating oil passage in the walking wheel shaft, the wide oil groove 93 of the bushing, and the oil hole 94 of the bushing form a maintenance oil injection oil passage system to the spaces where the two sets of tapered roller bearings are located, the spaces where the left and right roller assemblies are located, and then to the oil drainers 12 at the left and right ends.

[0051] Regardless of the above-mentioned structural type one or two, a left spacer may be provided between the end cover or the rib and the left support sleeve, and a right spacer may be provided between the gland and the right support sleeve. By controlling the thicknesses of the left spacer and the right spacer, more accurate axial positioning can be performed on the left end of the left roller group and the right end of the right roller group respectively, while avoiding wear on the end cover, the rib, and the gland. Left spacer notches and right spacer notches are respectively provided on the outer peripheral edges of the left spacer and the right spacer. In the installed state, the left spacer notch and the right spacer notch are respectively aligned with the left notch of the left support sleeve and the right notch of the right support sleeve in the circumferential direction. Since the oil injectors on both sides are inserted into the corresponding notches during installation, they can also prevent the left spacer, the left support sleeve, the right spacer, and the right support sleeve from rotating.

[0052] Regardless of the above-mentioned structural type one or two, the left roller group and the right roller group may be provided in one row (see Figure 6 ), or each may be provided in two rows (see Figure 1 , 2 , 3, 4, 5). When there are two rows, spacers are respectively provided between the two rows of left roller groups and between the two rows of right roller groups for axially limiting the two rows of rollers.

[0053] As Figure 1-5 shown, the compact walking wheel group of the thin coal seam shearer may further include a large gear 2. In this case, the left part of the walking wheel is set as a tooth section, and the right part is set as a spline shaft section. The large gear is sleeved on the spline section and is spline-connected to the walking wheel. The gland is embedded from the right end from the outside to the inside between the large gear and the bushing, and its end face flange abuts against the right end of the spline connection to axially position and fix the right support sleeve 6 and the large gear 2.

Claims

1. A compact traveling wheel set for a thin coal seam shearer, characterized in that: It includes walking wheels and a bushing. The walking wheels are sleeved on the bushing. A left roller assembly, two rows of axially loaded bearings, and a right roller assembly are sequentially arranged between the walking wheels and the bushing from left to right. A gland is sleeved on the right end of the bushing, and the gland is fixedly connected to the walking wheel. A rotary seal is arranged between the gland and the bushing. The gland axially positions the right roller assembly. The left roller assembly is axially positioned by sleeving an end cover on the left end of the bushing or by providing a rib integrated with the walking wheel at the left end of the left roller assembly. A rotary seal is arranged between the end cover or the rib and the bushing. The left roller assembly includes a left roller group and a left support sleeve. The left support sleeve is fixed relative to the inner hole of the walking wheel. The left support sleeve and the bushing respectively provide an outer raceway and an inner raceway for the left roller group. The right roller assembly includes a right roller group and a right support sleeve. The right support sleeve is fixed relative to the inner hole of the walking wheel. The right support sleeve and the bushing respectively provide an outer raceway and an inner raceway for the right roller group. The left support sleeve is provided with a right rib, and the right support sleeve is provided with a left rib. The right rib and the left rib respectively provide right-end axial positioning and left-end axial positioning for the left roller group and the right roller group. An intermediate support sleeve is arranged between the left support sleeve and the right support sleeve. The intermediate support sleeve is fixed relative to the inner hole of the walking wheel. An annular step is arranged in the middle of the bushing. The two rows of axially loaded bearings are arranged in one of the following two structural forms: One, two rows of axially loaded rolling elements and cage assemblies are arranged between the intermediate support sleeve and the bushing. The annular step axially separates the two rows of axially loaded rolling elements and cage assemblies. The axially loaded rolling elements and cage assemblies, the left rib, the right rib, and the annular step form two rows of thrust bearings on the left and right. Among them, the left rib and the right rib respectively act as the race rings of the thrust bearings, and the annular step acts as the shaft ring of the thrust bearing. Two, the two rows of axially loaded bearings adopt two sets of tapered roller bearings arranged symmetrically left and right. The outer rings of the two sets of tapered roller bearings are axially positioned by the intermediate support sleeve, the left support sleeve, and the right support sleeve. The inner rings of the two sets of tapered roller bearings are separated and axially positioned by the annular step;For Structure Type 1, left support sleeve oil grooves and right support sleeve oil grooves are respectively arranged axially on the outer cylindrical surfaces of the left support sleeve and the right support sleeve. Both the left support sleeve oil groove and the right support sleeve oil groove are through grooves. Left support sleeve left notches and right support sleeve right notches are respectively arranged at positions on the left end face of the left support sleeve and the right end face of the right support sleeve that are opposite to the left support sleeve oil groove and the right support sleeve oil groove. Left support sleeve oil holes and right support sleeve oil holes are respectively arranged inside the right retaining edge and the left retaining edge. The left support sleeve oil hole communicates with the space to the left of the right retaining edge through the left support sleeve oil groove, and the right support sleeve oil hole communicates with the space to the right of the left retaining edge through the right support sleeve oil groove. Left oil grooves and right oil grooves are respectively arranged on the left end face and the right end face of the intermediate support sleeve. One end of each of the left oil groove and the right oil groove extends to the outer cylindrical surface of the intermediate support sleeve, and the other end extends to the inner hole surface of the intermediate support sleeve. In the installed state, the left support sleeve oil groove communicates with the left oil groove, and the right support sleeve oil groove communicates with the right oil groove. Gaps are maintained between the right retaining edge and the left retaining edge and the shaft sleeve. Oil injectors and oil drainers are installed on the end cover or the retaining edge, and oil injectors and oil drainers are also installed on the gland. The outlet of the oil injector on the end cover or the retaining edge communicates with the left support sleeve oil groove through the left support sleeve left notch, and the inlet of the oil drainer communicates with the left end of the space to the left of the right retaining edge. The outlet of the oil injector on the gland communicates with the right support sleeve oil groove through the right support sleeve right notch, and the inlet of the oil drainer on the gland communicates with the right end of the space to the right of the left retaining edge.

2. The compact traveling wheel set for a thin coal seam shearer according to claim 1, characterized in that: A left spacer is further provided between the end cover or the retaining edge and the left support sleeve, and a right spacer is further provided between the gland and the right support sleeve. Left spacer notches and right spacer notches are respectively provided at the outer peripheral edges of the left spacer and the right spacer. In the installed state, the left spacer notch and the right spacer notch are respectively aligned with the left notch of the left support sleeve and the right notch of the right support sleeve.

3. The compact traveling wheel set for a thin coal seam shearer according to claim 1 or 2, characterized in that: A wide oil groove of the sleeve is provided on the inner hole wall of the sleeve. The sleeve is provided with a left oil hole of the sleeve, a middle oil hole of the sleeve and a right oil hole of the sleeve. The left oil hole of the sleeve communicates the wide oil groove of the sleeve with the gap between the right retaining edge and the sleeve. The right oil hole of the sleeve communicates the wide oil groove of the sleeve with the gap between the left retaining edge and the sleeve. A gap is maintained between the annular step and the middle support sleeve. The middle oil hole of the sleeve is located within the annular step. The middle oil hole of the sleeve communicates the wide oil groove of the sleeve with the gap between the annular step and the middle support sleeve.

4. The compact traveling wheel set for a thin coal seam shearer according to claim 1, characterized in that: For the second structural type, left support sleeve oil grooves and right support sleeve oil grooves are respectively provided along the axial direction on the outer cylindrical surfaces of the left support sleeve and the right support sleeve. Both the left support sleeve oil groove and the right support sleeve oil groove are through grooves. Left support sleeve left notches and left support sleeve right notches are respectively provided at positions on the left end face and the right end face of the left support sleeve that are opposite to the left support sleeve oil groove. Right support sleeve left notches and right support sleeve right notches are respectively provided at positions on the left end face and the right end face of the right support sleeve that are opposite to the right support sleeve oil groove. An oil injector and an oil drainer are installed on the end cover or the retaining edge, and an oil injector and an oil drainer are also installed on the gland. The outlet of the oil injector on the end cover or the retaining edge communicates with the left support sleeve oil groove through the left support sleeve left notch. The inlet of the oil drainer communicates with the left end of the space to the left of the right retaining edge. The outlet of the oil injector on the gland communicates with the right support sleeve oil groove through the right support sleeve right notch. The inlet of the oil drainer on the gland communicates with the right end of the space to the right of the left retaining edge.

5. The compact traveling wheel set for a thin coal seam shearer according to claim 4, characterized in that: A left spacer is further provided between the end cover or the retaining edge and the left support sleeve, and a right spacer is further provided between the gland and the right support sleeve. Left spacer notches and right spacer notches are respectively provided at the outer peripheral edges of the left spacer and the right spacer. In the installed state, the left spacer notch and the right spacer notch are respectively aligned with the left notch of the left support sleeve and the right notch of the right support sleeve.

6. The compact traveling wheel set for a thin coal seam shearer according to claim 4, characterized in that: A wide oil groove of the sleeve is provided on the inner hole wall of the sleeve. An oil hole of the sleeve is provided in the solid of the sleeve. One end of the oil hole of the sleeve opens on the top surface of the annular step, and the other end communicates with the wide oil groove of the sleeve.

7. The compact traveling wheel set for a thin coal seam shearer according to claim 5, characterized in that: An oil groove with a wide width is provided on the inner hole wall of the bushing, and an oil hole of the bushing is provided in the solid body of the bushing. One end of the oil hole of the bushing opens on the top surface of the annular step, and the other end communicates with the oil groove with a wide width of the bushing.

8. The compact walking wheel set of the thin coal seam shearer according to claim 1 or 2, 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.

9. The compact walking wheel set of the thin coal seam shearer according to claim 8, characterized in that: It further includes a large gear. The left part of the walking wheel is a tooth segment, and the right part is a spline shaft segment. The large gear is sleeved on the spline segment and is spline-connected with the walking wheel. The gland is embedded from the right end from the outside to the inside between the large gear and the bushing to axially position and fix the right support sleeve and the large gear.

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