External traction device of ultra-thin seam coal mining machine

Abstract

The invention discloses an ultra-thin seam coal mining machine external traction device which comprises a driving wheel shaft, a chain wheel, a spacer sleeve, a guide shoe, a first external traction assembly, a second external traction assembly and a positioning pin, the driving wheel shaft is sleeved with the chain wheel, the driving wheel shaft is sleeved with the spacer sleeve and abuts against the chain wheel, and the guide shoe is sleeved with the front end of the guide sleeve; the first outer traction assembly is rotatably arranged at the rear end of the spacer sleeve, the second outer traction assembly is rotatably arranged at the front end of the driving wheel shaft, and the first outer traction assembly and the second outer traction assembly are connected through a positioning pin. The chain wheel is compact in overall structure and convenient to mount and dismount, the overall length of the chain wheel is effectively shortened, meanwhile, the stress condition of the chain wheel is improved, the chain wheel only bears driving acting force, and the service life of the chain wheel is effectively prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of shearers, and particularly relates to an external traction device for a shearer in an extremely thin coal seam. Background Art

[0002] External traction is an important component of a shearer and is the traveling mechanism of the shearer. It has a compact structure and complex working conditions. For a shearer used in an extremely thin coal seam, due to the relatively low machine surface height, its disassembly and installation are relatively complex.

[0003] In the prior art, installation platforms are often formed by extending both ends of a sprocket, and bearings are directly installed on the installation platforms at both ends of the sprocket to play a supporting role. Since the overall length of the sprocket is relatively long, the sprocket is often integrally forged during manufacturing, with a large amount of subsequent processing. It not only takes time and effort in processing, but also has a low blank utilization rate. It is prone to deformation during heat treatment, and it is difficult to guarantee the quality in the later stage. When working, the sprocket bears the weight of the whole machine, thus greatly reducing the service life of the sprocket. Summary of the Invention

[0004] To at least partially solve the technical problems existing in the above prior art, the invention provides an external traction device for a shearer in an extremely thin coal seam.

[0005] The external traction device for a shearer in an extremely thin coal seam of the invention includes a drive wheel shaft, a sprocket, a retaining sleeve, a guide shoe, a first external traction assembly, a second external traction assembly, and a positioning pin. The sprocket is sleeved on the drive wheel shaft, the retaining sleeve is sleeved on the drive wheel shaft and abuts against the sprocket, the guide shoe is sleeved at the front end of the guide sleeve, the first external traction assembly is rotatably arranged at the rear end of the retaining sleeve, the second external traction assembly is rotatable at the front end of the drive wheel shaft, and the first external traction assembly and the second external traction assembly are connected by the positioning pin, wherein:

[0006] The first external traction assembly includes a first bearing, a first external traction housing, a first through cover, and a second through cover. The first external traction housing is sleeved on the first bearing, and the first through cover and the second through cover are respectively arranged at both ends of the first bearing for sealing and limiting the first bearing;

[0007] The second external traction assembly includes a second bearing, a second external traction housing, and an end cover. The second external traction housing is sleeved on the second bearing, and the end cover is arranged at the outer end of the second external traction housing for sealing and limiting the second bearing.

[0008] Furthermore, in the above-mentioned external traction device of the ultra-thin coal seam mining machine, a first shoulder and a second shoulder are arranged at the front end of the driving wheel shaft, a first limit platform is arranged between the first shoulder and the second shoulder, a spline is arranged in the circumferential direction of one end of the first shoulder close to the first limit platform, and a first annular groove is arranged on the side of the first limit platform close to the spline.

[0009] Furthermore, in the above-mentioned external traction device of the ultra-thin coal seam mining machine, the sprocket is connected to the driving wheel shaft through the spline, the first annular groove matches the inner diameter of the sprocket, and one end of the sprocket is limited by the first annular groove.

[0010] Furthermore, in the above-mentioned external traction device of the ultra-thin coal seam mining machine, an annular positioning platform is provided in the middle of the stopper sleeve, a second annular groove is provided at one end of the stopper sleeve, and a threaded hole is provided at the other end of the stopper sleeve. The stopper sleeve is transitionally matched with the first shaft shoulder, one end of the stopper sleeve is abutted against the sprocket, and the second annular groove matches the inner diameter of the sprocket.

[0011] Furthermore, in the above-mentioned external traction device of the ultra-thin coal seam mining machine, the inner diameter of the first bearing inner ring matches the diameter of the stop sleeve, the first bearing inner ring is transitionally matched with the stop sleeve, one end of the first bearing inner ring abuts against the annular positioning platform, and the first bearing outer ring is transitionally matched with the first external traction shell.

[0012] Furthermore, in the above-mentioned external traction device of the ultra-thin coal seam mining machine, the first transparent cover can be rotatably sleeved on the end face of the first external traction shell, the inner ring diameter of the first transparent cover matches the diameter of the driving wheel axle, the inner ring of the first transparent cover is sleeved on the driving wheel axle, and the first transparent cover is threadedly engaged with the threaded hole through bolts.

[0013] Furthermore, in the above-mentioned external traction device of the ultra-thin coal seam mining machine, the second transparent cover is embedded in the first external traction shell and fixed by bolts, the inner ring of the second transparent cover can be rotatably sleeved on the annular positioning platform, and the thickness of the second transparent cover is equal to the width of the annular positioning platform.

[0014] Furthermore, in the above-mentioned external traction device of the ultra-thin coal seam mining machine, the guide shoe is transitionally matched with the stop sleeve, one end of the guide shoe abuts against the annular positioning platform, and the other end of the guide shoe is provided with a third annular groove, and the third annular groove corresponds to the second annular groove to form an annular groove, and the annular groove matches the sprocket, and the other end of the sprocket is limited and fixed by the annular groove.

[0015] Further, in the external traction device of the ultra-thin coal seam shearer, the inner ring of the second bearing is in transitional fit with the second shaft shoulder, one end of the inner ring of the first bearing abuts against the first limiting platform, the outer ring of the second bearing is in transitional fit with the second external traction housing, the end cover is connected to the second external traction housing by bolts, and an annular boss is arranged on the end cover, and the annular boss abuts against the outer ring of the second bearing.

[0016] Further, in the external traction device of the ultra-thin coal seam shearer, a first oil passage is machined on the first external traction housing, a second oil passage is machined on the second external traction housing, the first oil passage and the second oil passage are connected by an O-ring, oil holes are arranged between the first external traction housing and the first bearing and between the second external traction housing and the second bearing, and the oil holes are all communicated with the first oil passage and the second oil passage.

[0017] The external traction device of the ultra-thin coal seam shearer of the present invention has the following advantages and beneficial effects:

[0018] The overall structure of the present invention is compact, facilitating installation and disassembly, effectively shortening the overall length of the sprocket, and at the same time improving the force-bearing condition of the sprocket. The whole machine weight is borne by the guide shoe and the retaining sleeve, so that the sprocket is only subject to the driving force, effectively increasing the service life of the sprocket. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for further understanding of the embodiments of the present invention and constitute a part of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. In the drawings:

[0020] Figure 1 is a schematic diagram of the overall structure of the external traction device of the ultra-thin coal seam shearer of the present invention;

[0021] Figure 2 is a schematic sectional view of the external traction device of the ultra-thin coal seam shearer of the present invention;

[0022] Figure 3 is a schematic diagram of the driving wheel shaft structure of the external traction device of the ultra-thin coal seam shearer of the present invention;

[0023] Figure 4 is a schematic diagram of the retaining sleeve structure of the external traction device of the ultra-thin coal seam shearer of the present invention;

[0024] Figure 5 is a schematic diagram of the wheel shaft structure of the external traction device of the ultra-thin coal seam shearer of the present invention;

[0025] Figure 6 This is a schematic diagram of the end cover structure of the external traction device of the ultra-thin coal seam shearer of the present invention.

[0026] Explanation of the reference numerals in the drawings:

[0027] 1: drive wheel shaft, 11: first shaft shoulder, 12: second shaft shoulder, 13: first limiting platform, 14: spline, 15: first annular groove;

[0028] 2: sprocket;

[0029] 3: retaining sleeve, 31: annular positioning platform, 32: threaded hole;

[0030] 4: guide shoe;

[0031] 5: first external traction assembly, 51: first bearing, 52: first external traction housing, 521: first oil passage, 53: first through cover, 54: second through cover;

[0032] 6: second external traction assembly, 61: second bearing, 62: second external traction housing, 621: second oil passage, 63: end cover, 64: annular boss;

[0033] 7: positioning pin;

[0034] 8: annular groove, 81: second annular groove, 82: third annular groove;

[0035] 9: oil hole. Detailed implementation manners

[0036] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0037] As Figures 1 to 6 shown, the external traction device of the ultra-thin coal seam shearer of the present invention includes a drive wheel shaft 1, a sprocket 2, a retaining sleeve 3, a guide shoe 4, a first external traction assembly 5, a second external traction assembly 6 and a positioning pin 7. The sprocket 2 is sleeved on the drive wheel shaft 1, the retaining sleeve 3 is sleeved on the drive wheel shaft 1 and abuts against the sprocket 2, the guide shoe 4 is sleeved on the front end of the guide sleeve, the first external traction assembly 5 is rotatably arranged at the rear end of the retaining sleeve 3, the second external traction assembly 6 is rotatably arranged at the front end of the drive wheel shaft 1, and the first external traction assembly 5 and the second external traction assembly 6 are connected by the positioning pin 7, wherein:

[0038] The first external traction assembly 5 includes a first bearing 51, a first external traction housing 52, a first transparent cover 53 and a second transparent cover 54. The first external traction housing 52 is sleeved on the first bearing 51, and the first transparent cover 53 and the second transparent cover 54 are respectively arranged at both ends of the first bearing 51 for sealing and limiting the first bearing 51.

[0039] The second external traction assembly 6 includes a second bearing 61, a second external traction housing 62 and an end cover 63. The second external traction housing 62 is sleeved on the second bearing 61, and the end cover 63 is arranged at the outer end of the second external traction housing 62 for sealing and limiting the second bearing 61.

[0040] Further, in the external traction device of the ultra-thin coal seam shearer of the present invention, a first shaft shoulder 11 and a second shaft shoulder 12 are arranged at the front end of the drive wheel shaft 1. A first limiting platform 13 is arranged between the first shaft shoulder 11 and the second shaft shoulder 12. A spline 14 is arranged in the circumferential direction at one end of the first shaft shoulder 11 close to the first limiting platform 13, and a first annular groove 15 is arranged on one side of the first limiting platform 13 close to the spline 14.

[0041] Further, in the external traction device of the ultra-thin coal seam shearer of the present invention, the sprocket 2 is connected to the drive wheel shaft 1 through the spline 14. The first annular groove 15 matches the inner diameter of the sprocket 2. One end of the sprocket 2 is limited by the first annular groove 15, so as to ensure that the sprocket 2 is limited and fixed on the drive wheel shaft 1, and the sprocket 2 can be driven to rotate when the drive wheel shaft 1 rotates.

[0042] Further, in the external traction device of the ultra-thin coal seam shearer of the present invention, an annular positioning platform 31 is arranged in the middle of the retaining sleeve 3. A second annular groove 81 is arranged at one end of the retaining sleeve 3, and a threaded hole 32 is arranged at the other end of the retaining sleeve 3. The retaining sleeve 3 is in transitional fit with the first shaft shoulder 11. One end of the retaining sleeve 3 abuts against the sprocket 2, and the second annular groove 81 matches the inner diameter of the sprocket 2.

[0043] Further, in the external traction device of the ultra-thin coal seam shearer of the present invention, the inner diameter of the inner ring of the first bearing 51 matches the diameter of the retaining sleeve 3. The inner ring of the first bearing 51 is in transitional fit with the retaining sleeve 3. One end of the inner ring of the first bearing 51 abuts against the annular positioning platform 31, and the outer ring of the first bearing 51 is in transitional fit with the first external traction housing 52.

[0044] Further, in the external traction device of the ultra-thin coal seam shearer of the present invention, the first transparent cover 53 is rotatably sleeved on the end face of the first external traction housing 52. The inner diameter of the inner ring of the first transparent cover 53 matches the diameter of the drive wheel shaft 1. The inner ring of the first transparent cover 53 is sleeved on the drive wheel shaft 1, and the first transparent cover 53 is threadedly engaged with the threaded hole 32 through a bolt.

[0045] Further, in the external traction device of the ultra-thin coal seam shearer of the present invention, the second transparent cover 54 is fitted into the first external traction housing 52 and fixed by bolts. The inner circle of the second transparent cover 54 is rotatably sleeved on the annular positioning table 31. The thickness of the second transparent cover 54 is equal to the width of the annular positioning table 31. Thus, the inner ring of the first bearing 51 is limited by the first transparent cover 53 and the annular positioning table 31, and the outer ring of the first bearing 51 is limited by the second transparent cover 54, effectively ensuring the stability of the first external traction housing 52 during the rotation of the drive wheel shaft 1. The weight of the first external traction housing 52 is borne by the retaining sleeve 3, and at the same time, it is convenient for loading and unloading when disassembling and assembling the sprocket 2.

[0046] Further, to improve the service life of the first bearing 51, sealing rings are provided in the circumferential direction of the outer circle of the first transparent cover 53 and the circumferential direction of the positioning annular table. The sealing gasket in the circumferential direction of the outer circle of the first transparent cover 53 uses a Gleitring, and the sealing gasket in the circumferential direction of the positioning annular table uses a Struthers ring, thereby improving the sealing performance of the first transparent cover 53 and the second transparent cover 54 and ensuring that the lubricating oil inside the first bearing 51 does not leak.

[0047] Further, in the external traction device of the ultra-thin coal seam shearer of the present invention, the guide shoe 4 is in transitional fit with the retaining sleeve 3. One end of the guide shoe 4 abuts against the annular positioning table 31, and a third annular groove 82 is provided at the other end of the guide shoe 4. The third annular groove 82 corresponds to the second annular groove 81 to form an annular groove 8. The annular groove 8 matches the sprocket 2, and the other end of the sprocket 2 is limited and fixed through the annular groove 8. Thus, the sprocket 2 is completely limited and fixed by the guide shoe 4 and the retaining sleeve 3.

[0048] Further, in the external traction device of the ultra-thin coal seam shearer of the present invention, the inner ring of the second bearing 61 is in transitional fit with the second shoulder 12. One end of the inner ring of the first bearing 51 abuts against the first limiting table 13. The outer ring of the second bearing 61 is in transitional fit with the second external traction housing 62. The end cover 63 is connected to the second external traction housing 62 by bolts. An annular boss 64 is provided on the end cover 63, and the annular boss 64 abuts against the outer ring of the second bearing 61, thereby limiting the second bearing 61 and ensuring the stability of the second external traction housing 62 when the drive wheel shaft 1 rotates.

[0049] Further, in the external traction device of the ultra-thin coal seam shearer of the present invention, a first oil passage 521 is machined on the first external traction housing 52, and a second oil passage 621 is machined on the second external traction housing 62. The first oil passage 521 and the second oil passage 621 are connected by an O-ring. Oil holes 9 are provided between the first external traction housing 52 and the first bearing 51 and between the second external traction housing 62 and the second bearing 61. The oil holes 9 are all communicated with the first oil passage 521 and the second oil passage 621, thereby supplying oil to the first bearing 51 and the second bearing 61 and ensuring the service life of the first bearing 51 and the second bearing 61.

[0050] Specifically, during installation, the first external traction assembly 5 and the guide shoe 4 can be assembled with the retaining sleeve 3 first, and then the sprocket 2 and the assembled retaining sleeve 3 are successively installed on the drive wheel shaft 1. After the second external traction assembly 6 is assembled, it is installed on the drive wheel shaft 1. During maintenance, disassembly and assembly can be carried out according to the replaced parts.

[0051] During use, the first external traction housing 52 and the second external traction housing 62 are fixed to the traction box by bolts. When the drive wheel shaft 1 rotates, the first external traction housing 52 and the second external traction housing 62 are kept stable through the first bearing 51 and the second bearing 61 respectively. The drive wheel shaft 1 drives the sprocket 2 to rotate, providing traction for the chain.

[0052] In summary, compared with the prior art, the external traction device of the ultra-thin coal seam shearer of the present invention has the following advantages and beneficial effects: The overall structure of the present invention is compact, facilitating installation and disassembly, effectively shortening the overall length of the sprocket, while improving the force-bearing condition of the sprocket. The guide shoe and the retaining sleeve bear the weight of the whole machine, enabling the sprocket to be only subjected to driving force, effectively increasing the service life of the sprocket.

[0053] It should be noted that in this article, unless otherwise clearly specified and defined, the term "connection" or its synonyms should be understood in a broad sense. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood according to specific circumstances. Moreover, expressions such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. At the same time, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. In addition, in this article, "front", "rear", "left", "right", "up" and "down" are all referred to the placement state shown in the drawings.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An external traction device for a very thin coal seam shearer, characterized in that, The external traction device of the ultra-thin coal seam mining machine includes a driving wheel shaft, a sprocket, a stopper sleeve, a guide shoe, a first external traction component, a second external traction component and a positioning pin, the sprocket is sleeved on the driving wheel shaft, the stopper sleeve is sleeved on the driving wheel shaft and abuts against the sprocket, the guide shoe is sleeved on the front end of the guide sleeve, the first external traction component is rotatably arranged at the rear end of the stopper sleeve, the second external traction component is rotatably arranged at the front end of the driving wheel shaft, and the first external traction component and the second external traction component are connected through the positioning pin, wherein: The first external traction assembly includes a first bearing, a first external traction housing, a first transparent cover and a second transparent cover, the first external traction housing is sleeved on the first bearing, and the first transparent cover and the second transparent cover are respectively arranged at two ends of the first bearing for sealing and limiting the first bearing; The second outer traction assembly includes a second bearing, a second outer traction housing and an end cover. The second outer traction housing is sleeved on the second bearing. The end cover is arranged at the outer end of the second outer traction housing and is used to seal and limit the second bearing.

2. The external traction device for a coal shearer in an extremely thin coal seam according to claim 1, wherein The front end of the driving wheel shaft is provided with a first shoulder and a second shoulder, a first limit platform is provided between the first shoulder and the second shoulder, a spline is provided in the circumferential direction of one end of the first shoulder close to the first limit platform, and a first annular groove is provided on one side of the first limit platform close to the spline.

3. The outer traction device of the ultra-thin coal seam shearer according to claim 2, characterized in that The sprocket is connected to the driving wheel shaft via the spline, the first annular groove matches the inner diameter of the sprocket, and one end of the sprocket is limited by the first annular groove.

4. The external traction device for an ultra-thin coal seam shearer according to claim 2, wherein An annular positioning platform is arranged in the middle of the sleeve, a second annular groove is arranged at one end of the sleeve, a threaded hole is arranged at the other end of the sleeve, the sleeve is transitionally matched with the first shoulder, one end of the sleeve abuts against the sprocket, and the second annular groove matches the inner diameter of the sprocket.

5. The external traction device for an ultra-thin coal seam shearer according to claim 4, wherein The inner diameter of the first bearing inner ring matches the diameter of the stop sleeve, the first bearing inner ring and the stop sleeve are transitionally matched, one end of the first bearing inner ring abuts against the annular positioning platform, and the first bearing outer ring and the first outer traction housing are transitionally matched.

6. The external traction device for a very thin coal seam shearer according to claim 4, wherein, The first transparent cover is rotatably sleeved on the end surface of the first outer traction shell, the inner ring diameter of the first transparent cover matches the diameter of the driving wheel shaft, the inner ring of the first transparent cover is sleeved with the driving wheel shaft, and the first transparent cover is threadedly engaged with the threaded hole through bolts.

7. The external traction device for a very thin coal seam shearer according to claim 4, characterized in that, The second transparent cover is embedded in the first outer traction housing and fixed by bolts. The inner ring of the second transparent cover can be rotatably sleeved on the annular positioning platform. The thickness of the second transparent cover is equal to the width of the annular positioning platform.

8. The external traction device for a very thin coal seam shearer according to claim 4, characterized in that, The guide shoe is transitionally matched with the stop sleeve, one end of the guide shoe abuts against the annular positioning platform, and the other end of the guide shoe is provided with a third annular groove, the third annular groove and the second annular groove correspond to form an annular groove, the annular groove matches the sprocket, and the other end of the sprocket is limited and fixed by the annular groove.

9. The external traction device for a very thin coal seam shearer according to claim 2, characterized in that, The inner ring of the second bearing is in transitional fit with the second shaft shoulder. One end of the inner ring of the first bearing abuts against the first limiting platform. The outer ring of the second bearing is in transitional fit with the second outer traction housing. The end cover is connected to the second outer traction housing by bolts. An annular boss is provided on the end cover, and the annular boss abuts against the outer ring of the second bearing.

10. The external traction device of the ultra-thin coal seam shearer according to claim 1, characterized in that, A first oil passage is machined on the first outer traction housing, and a second oil passage is machined on the second outer traction housing. The first oil passage and the second oil passage are connected by an O-ring. Oil holes are provided between the first outer traction housing and the first bearing and between the second outer traction housing and the second bearing, and the oil holes are all communicated with the first oil passage and the second oil passage.

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