Coal mining machine travel assembly and coal mining machine

Abstract

The present invention provides a coal mining machine travel assembly and a coal mining machine. The coal mining machine travel assembly includes a first transmission shaft, one end of which is used for transmission connection with the driving device of the coal mining machine, and the other end extends outward from the coal mining machine; a second transmission shaft, one end of which is transmission connected with one end of the first transmission shaft extending out of the coal mining machine; a travel gear, which is sleeved on the second transmission shaft and is used to mesh with the pin track of the middle groove of the scraper conveyor. The travel gear rotates under the drive of the first transmission shaft and the second transmission shaft, so as to drive the coal mining machine to move along the pin track through the rotation of the travel gear, wherein an overload protection structure is provided on the second transmission shaft, and the overload protection structure is located between the travel gear and the first transmission shaft, so as to achieve stress concentration at the position of the overload protection structure. Through the technical solution of the present invention, when an overload occurs, the degree of damage can be reduced, and at the same time, it is convenient to carry out replacement operations, which is conducive to improving the efficiency of coal mining operations.

Description

Technical Field

[0001] The invention relates to the technical field of coal mining machines, and in particular to a coal mining machine traveling assembly and a coal mining machine. Background Art

[0002] At present, the coal mining machine is a common coal mining engineering machinery used for mechanized coal mining operations in the coal mining face. During the coal mining operation, the traveling part of the coal mining machine travels along the middle groove guide of the scraper conveyor. Due to the complex environment and harsh conditions of the coal mining face, the traveling part of the coal mining machine is prone to various abnormal damages or failures during actual use, such as broken teeth of the traveling wheel, damage to the guide shoe, abnormal wear of the traveling wheel and the pin row pin teeth, broken transmission shaft, unbalanced left and right traction, etc. The existing traveling part of the coal mining machine is not reliable, especially the connecting spline between the transmission long shaft and the transmission short shaft is easily damaged. Once a failure occurs, it is inconvenient to repair or replace it, resulting in the coal mining machine being unable to operate normally, affecting the work efficiency of all links in the entire coal mining face. Summary of the invention

[0003] The present invention aims to improve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, an object of the present invention is to provide a coal mining machine traveling assembly.

[0005] Another object of the present invention is to provide a coal mining machine.

[0006] In order to achieve the above-mentioned purpose, the first technical solution of the present invention provides a coal mining machine traveling assembly for the coal mining machine, including: a first transmission shaft, one end of the first transmission shaft is used for transmission connection with the driving device of the coal mining machine, and the other end of the first transmission shaft extends outward from the coal mining machine; a second transmission shaft, one end of the second transmission shaft is transmission connected with the end of the first transmission shaft extending out of the coal mining machine; a traveling gear, which is sleeved on the second transmission shaft and is used to engage with the pin track of the middle groove of the scraper conveyor, and the traveling gear can rotate under the drive of the first transmission shaft and the second transmission shaft, so as to drive the coal mining machine to move along the pin track through the rotation of the traveling gear, wherein an overload protection structure is provided on the second transmission shaft, and the overload protection structure is located between the traveling gear and the first transmission shaft, so as to realize stress concentration at the position of the overload protection structure.

[0007] According to the technical solution of the first aspect of the present invention, the coal mining machine travel assembly includes a first transmission shaft, a second transmission shaft and a travel gear. One end of the first transmission shaft is used for transmission connection with the driving device of the coal mining machine, and the other end of the first transmission shaft extends outward from the coal mining machine to transmit the output power of the driving device through the first transmission shaft. One end of the second transmission shaft is transmission connected to the end of the first transmission shaft extending out of the coal mining machine, and the travel gear is sleeved on the second transmission shaft to transmit the output power of the driving device to the travel gear through the first transmission shaft and the second transmission shaft, so as to drive the travel gear to rotate. Specifically, the travel gear is used to mesh with the pin rail of the middle groove of the scraper conveyor, so that when the travel gear rotates, the reaction force of the pin rail drives the travel gear to move along the extension direction of the pin rail, thereby driving the coal mining machine to move along the extension direction of the pin rail.

[0008] Among them, by providing an overload protection structure on the second transmission shaft, and the overload protection structure is located between the traveling gear and the first transmission shaft, when the second transmission shaft is overloaded, that is, when it is subjected to the force of overload, the stress is concentrated by the overload protection structure, so that the second transmission shaft is broken at the position of the overload protection structure, thereby preventing damage to the connection between the second transmission shaft and the first transmission shaft, which is beneficial to reducing the possibility of damage to the first transmission shaft. At the same time, the fracture point of the second transmission shaft is located at the position of the overload protection structure, which is convenient for disassembly and replacement of the second transmission shaft, which can greatly shorten the maintenance time, reduce the maintenance cost, reduce the impact on coal mining operations, and is beneficial to improving the efficiency of coal mining operations.

[0009] In addition, the coal mining machine travel assembly in the above technical solution provided by the present invention may also have the following additional technical features:

[0010] In the above technical solution, the overload protection structure is a unloading groove, which is arranged along the circumferential direction of the second transmission shaft, and in the axial direction, the unloading groove is located between the connection between the second transmission shaft and the first transmission shaft and the traveling gear.

[0011] In this technical solution, the overload protection structure is specifically a relief groove, which is arranged along the circumferential direction of the second transmission shaft, so that when the second transmission shaft is overloaded, the stress on the relief groove in the circumferential direction is uniform. In the axial direction, by arranging the relief groove between the connection between the second transmission shaft and the first transmission shaft and the running gear, when the relief groove breaks, the connection between the second transmission shaft and the first transmission shaft is not affected, thereby reducing damaged parts and reducing losses.

[0012] In the above technical solution, a spline sleeve is provided at the end of the first transmission shaft extending outward from the coal mining machine, and an internal spline is provided on the inner wall of the spline sleeve; an external spline is provided on the outer side surface along the circumferential direction of the end of the second transmission shaft connected to the first transmission shaft, and the transmission connection between the second transmission shaft and the first transmission shaft is realized through the cooperation between the external spline and the internal spline.

[0013] In this technical solution, the first transmission shaft and the second transmission shaft are connected by a spline. Specifically, a spline sleeve is provided at one end of the first transmission shaft extending outward from the coal mining machine, and an inner spline is provided on the inner side wall of the spline sleeve; an outer spline is provided on the outer side surface along the circumferential direction of one end of the second transmission shaft connected to the first transmission shaft, and the outer spline matches the inner spline. The second transmission shaft extends into the spline sleeve, and the transmission connection between the second transmission shaft and the first transmission shaft is realized through the cooperation of the outer spline and the inner spline, so that the second transmission shaft can rotate together with the first transmission shaft to transmit the output power of the driving device to the travel gear.

[0014] In the above technical solution, the length of the first transmission shaft is greater than the length of the second transmission shaft.

[0015] In this technical solution, by setting the length of the first transmission shaft to be greater than that of the second transmission shaft, power transmission can be achieved through the relatively long first transmission shaft while maintaining an appropriate distance between the traveling gear and the coal mining machine body; and the traveling gear is arranged on the relatively short second transmission shaft to reduce the bending moment of the second transmission shaft, enhance the strength of the second transmission shaft, and reduce the failure rate.

[0016] In the above technical scheme, the traveling part of the coal mining machine also includes: a traveling box, which is sleeved on the second transmission shaft, and a through hole is provided on the side wall of the traveling box close to one end of the first transmission shaft, and a first opening is provided at the bottom of the traveling box, wherein the second transmission shaft extends into the traveling box through the through hole, and is rotatably connected to the traveling box through the first bearing and the second bearing, and the traveling gear is provided at the part of the second transmission shaft located in the traveling box, and the bottom of the traveling gear extends out through the first opening and engages with the pin rail.

[0017] In this technical solution, a traveling box is sleeved on the second transmission shaft to play a protective role. Specifically, a through hole is provided on the side wall of the traveling box facing the first transmission shaft, and the end of the second transmission shaft away from the first transmission shaft extends into the traveling box through the through hole, and is rotatably connected with the traveling box through the first bearing and the second bearing. A first opening is provided at the bottom of the traveling box, and the traveling gear is sleeved on the part of the second transmission shaft located in the traveling box, and the bottom of the traveling gear extends out of the traveling box through the first opening to engage with the pin rail. It can be understood that the environment of the coal mining face is complex. By setting up a traveling box, the traveling gear and the connection between the traveling gear and the second transmission shaft can be shielded to prevent coal ash or other impurities from falling into and affecting the normal connection between the traveling gear and the second transmission shaft. At the same time, the traveling box can also prevent the traveling gear from contacting with external objects or operators during rotation to reduce safety hazards.

[0018] In the above technical solution, the first bearing is located at the end of the traveling gear away from the first transmission shaft, and the second bearing is located at the end of the traveling gear close to the first transmission shaft; a second opening is provided at the end of the traveling box away from the first transmission shaft, and the second opening is arranged corresponding to the second bearing, wherein an end cover is provided at the first opening, and the end cover is detachably connected to the traveling box.

[0019] In this technical solution, the first bearing is located at the end of the traveling gear away from the first transmission shaft, and the second bearing is located at the end of the traveling gear close to the first transmission shaft, so as to provide support for the second transmission shaft through the first bearing and the second bearing, and realize the rotational connection between the second transmission shaft and the traveling box. By providing a second opening at the end of the traveling box away from the first transmission shaft, and the second opening is arranged corresponding to the first bearing, when the second transmission shaft fails, maintenance or replacement operations can be performed through the second opening, without disassembling the traveling box as a whole, thereby reducing the workload of disassembly and assembly. By providing a detachable end cover at the second opening, the second opening can be sealed by the end cover during normal use to play a protective role. When the second transmission shaft breaks due to overload, the second transmission shaft can be replaced through the second opening after the end cover is removed.

[0020] In the above technical solution, the coal mining machine travel assembly also includes: a guide shoe, which is arranged at the bottom of the travel box, and the guide shoe is connected to the pin rail and can move along the pin rail together with the travel gear.

[0021] In this technical solution, a guide shoe is provided at the bottom of the travel box, and the guide shoe is connected to the pin track, so that the guide shoe provides support for the travel box, and the pressure of the travel box on the travel gear is shared, thereby reducing the resistance of the travel gear during rotation. The guide shoe can also move along the pin track with the travel gear, so that the guide shoe guides the travel gear and prevents the movement direction of the travel gear from deviating.

[0022] In the above technical solution, the coal mining machine travel assembly also includes: a positioning sleeve, which is sleeved on the second transmission shaft, the positioning sleeve is located between the travel gear and the unloading groove in the axial direction, and a first boss is provided on the outer wall of the positioning sleeve along the radial direction, wherein the second bearing is sleeved on the outer side of the positioning sleeve, and the two ends of the first boss along the axial direction are respectively against the travel gear and the second bearing.

[0023] In this technical solution, a positioning sleeve is sleeved on the second transmission shaft, and the positioning sleeve is located between the travel gear and the unloading groove in the axial direction, so that the travel gear is axially positioned by the positioning sleeve. The second bearing sleeve is arranged on the outside of the positioning sleeve, so that the positioning sleeve can rotate relative to the travel box together with the second transmission shaft. Among them, a first boss is provided on the outer side wall of the positioning sleeve in the radial direction, and the two ends of the first boss in the axial direction are respectively against the travel gear and the second bearing to limit the axial displacement of the travel gear.

[0024] In the above technical solution, the coal mining machine travel assembly also includes: a third bearing, which is sleeved on one end of the first transmission shaft close to the travel gear, there is an axial gap between the third bearing and the second bearing, and the end of the third bearing away from the second bearing is against the second boss of the first transmission shaft; a sleeve, which is arranged in the axial gap, and the two ends of the sleeve along the axial direction are respectively against the second bearing and the third bearing, wherein the unloading groove is located in the axial gap.

[0025] In this technical solution, a third bearing is sleeved on the end of the first transmission shaft close to the running gear, and the end of the third bearing away from the second bearing is against the second boss formed on the first transmission shaft. An axial gap exists between the end of the third bearing close to the second bearing and the second bearing. A clamping sleeve is provided in the axial gap, and the two ends of the clamping sleeve along the axial direction are respectively against the end faces of the second bearing and the third bearing, thereby realizing the axial positioning of the second bearing, the third bearing and the positioning sleeve. Among them, by setting the unloading groove in the axial gap, the positioning sleeve or the second bearing or the third bearing is prevented from axial displacement and blocking the unloading groove, affecting the overload protection function of the unloading groove, and at the same time, the positioning sleeve or the second bearing can be prevented from contacting with the spline sleeve and the external spline. It can be understood that if the positioning sleeve is axially displaced and blocks the unloading groove, when the second transmission shaft is overloaded, the positioning sleeve will bear part of the stress, which may cause the second transmission shaft to fail to break at the unloading groove position and fail to play the role of overload protection.

[0026] The second technical solution of the present invention provides a coal mining machine, including: a coal mining machine body, the coal mining machine body is provided with a driving device; a plurality of coal mining machine traveling components according to any one of the above-mentioned first technical solutions, wherein the end of the first transmission shaft of each coal mining machine traveling component away from the second transmission shaft is transmission-connected to the driving device, so that the driving device drives the traveling gear in the coal mining machine traveling component to rotate, thereby driving the coal mining machine body to move along the pin rail.

[0027] According to the technical solution of the second aspect of the present invention, the coal mining machine includes a coal mining machine body and a plurality of coal mining machine travel components of any one of the above-mentioned technical solutions of the first aspect, so as to realize the movement of the coal mining machine through the plurality of coal mining machine travel components. Specifically, the coal mining machine body is used to carry the coal mining operation mechanism as the main part of the coal mining machine. The coal mining machine body is provided with a driving device for outputting the power for driving the coal mining machine body to move. The end of the first transmission shaft in each coal mining machine travel component away from the second transmission shaft is connected to the driving device in a transmission manner, so as to transmit the output power of the driving device to the travel gear through the first transmission shaft and the second transmission shaft, drive the travel gear to rotate, and then through the meshing between the travel gear and the pin rail, react to the travel gear, so that the travel gear moves along the extension direction of the pin rail, and then drive the coal mining machine body to move along the extension direction of the pin rail.

[0028] It should be noted that the driving device in this solution can be provided with a corresponding speed reduction mechanism according to the specific situation to reduce the output speed of the output end of the driving device.

[0029] In addition, the coal mining machine in this solution also includes all the beneficial effects of the coal mining machine walking assembly of any one of the above-mentioned first aspect technical solutions, which will not be repeated here.

[0030] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0032] Figure 1 A cross-sectional view of a coal mining machine travel assembly according to an embodiment of the present invention is shown;

[0033] Figure 2 Shows Figure 1 A magnified view of part A;

[0034] Figure 3 A partial cross-sectional view of a coal mining machine travel assembly according to an embodiment of the present invention is shown;

[0035] Figure 4 A cross-sectional view of a coal mining machine travel assembly according to an embodiment of the present invention is shown;

[0036] Figure 5 A schematic diagram of a coal mining machine travel assembly according to an embodiment of the present invention is shown;

[0037] Figure 6 A partial cross-sectional view of a coal mining machine travel assembly according to an embodiment of the present invention is shown;

[0038] Figure 7 A partial cross-sectional view of a coal mining machine travel assembly according to an embodiment of the present invention is shown;

[0039] Figure 8 Shows Figure 7 Magnified view of part B.

[0040] Figures 1 to 8 The corresponding relationship between the reference numerals and components is as follows:

[0041] 1 first transmission shaft, 11 spline sleeve, 111 internal spline, 112 second boss, 113 third bearing, 2 second transmission shaft, 21 unloading groove, 22 external spline, 3 travel gear, 4 travel box, 41 first bearing, 42 second bearing, 43 end cover, 44 guide shoe, 5 positioning sleeve, 51 first boss, 52 ferrule. DETAILED DESCRIPTION

[0042] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0043] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0044] Refer to the following Figures 1 to 8 A coal mining machine travel assembly and a coal mining machine according to some embodiments of the present invention are described.

[0045] Embodiment 1

[0046] This embodiment provides a coal mining machine walking assembly for a coal mining machine, such as Figure 1 As shown, the coal mining machine travel assembly includes a first transmission shaft 1, a second transmission shaft 2 and a travel gear 3.

[0047] The first transmission shaft 1 and the second transmission shaft 2 are used to transmit the output power of the driving device of the coal mining machine, and the travel gear 3 drives the coal mining machine to move by rotating. Figure 1As shown, one end of the first transmission shaft 1 is used for transmission connection with the driving device of the coal mining machine, and the other end of the first transmission shaft 1 extends outward from the coal mining machine; one end of the second transmission shaft 2 is transmission connected with the end of the first transmission shaft 1 extending out of the coal mining machine, and the other end of the second transmission shaft 2 extends along the axial direction of the first transmission shaft 1. The travel gear 3 is sleeved on the second transmission shaft 2 and is transmission connected with the second transmission shaft 2; the travel gear 3 is meshed with the pin track of the middle groove of the scraper conveyor. The output power of the driving device is transmitted to the travel gear 3 through the first transmission shaft 1 and the second transmission shaft 2, driving the travel gear 3 to rotate, so that the pin track generates a reaction force on the travel, so as to drive the travel gear 3 to move along the extension direction of the pin track, and then drive the coal mining machine to move along the extension direction of the pin track.

[0048] Among them, Figure 2 As shown, the second transmission shaft 2 is provided with an overload protection structure, specifically, the overload protection structure is a relief groove 21, which is arranged along the circumferential direction of the second transmission shaft 2, and in the axial direction, the relief groove 21 is located between the running gear 3 and the first transmission shaft 1. When the second transmission shaft 2 is overloaded, that is, when it is subjected to an overload force, the relief groove 21 can concentrate stress, so that the second transmission shaft 2 breaks at the position of the relief groove 21, so as to prevent damage to the connection between the second transmission shaft 2 and the first transmission shaft 1.

[0049] The coal mining machine travel assembly in this embodiment can reduce the possibility of damage to the first transmission shaft 1. When an overload occurs, the fracture point of the second transmission shaft 2 is located at the position of the overload protection structure, which is convenient for disassembly and replacement of the second transmission shaft 2, which is beneficial to shorten the maintenance time, reduce the maintenance cost, reduce the impact of the maintenance process on the coal mining operation, and help improve the efficiency of the coal mining operation.

[0050] Embodiment 2

[0051] The coal mining machine travel assembly provided in this embodiment is further improved on the basis of the first embodiment.

[0052] like Figure 3 As shown, the first transmission shaft 1 and the second transmission shaft 2 are connected by splines. Specifically, a spline sleeve 11 is provided at one end of the first transmission shaft 1 extending outward from the coal mining machine, and an inner spline 111 is provided on the inner side wall of the spline sleeve 11; an outer spline 22 is provided on the outer side surface along the circumferential direction of one end of the second transmission shaft 2 connected to the first transmission shaft 1, and the outer spline 22 matches the inner spline 111. The end of the second transmission shaft 2 provided with the outer spline 22 extends into the spline sleeve 11, and the transmission connection between the second transmission shaft 2 and the first transmission shaft 1 is realized through the cooperation of the outer spline 22 and the inner spline 111, so that the second transmission shaft 2 can rotate together with the first transmission shaft 1 to transmit the output power of the driving device to the travel gear 3.

[0053] Furthermore, the length of the first transmission shaft 1 is greater than that of the second transmission shaft 2. While the power transmission is realized by the relatively long first transmission shaft 1, the travel gear 3 can be kept at an appropriate distance from the coal mining machine body; the relatively short second transmission shaft 2 is conducive to reducing the bending moment and improving the strength.

[0054] Embodiment 3

[0055] The coal mining machine travel assembly provided in this embodiment is further improved on the basis of the second embodiment.

[0056] like Figure 4 As shown, the coal mining machine travel assembly also includes a travel box 4, which is sleeved on the second transmission shaft 2 for protection. Specifically, a through hole is provided on the side wall of the travel box 4 close to one end of the first transmission shaft 1, and the end of the second transmission shaft 2 away from the first transmission shaft 1 extends into the travel box 4 through the through hole. A first bearing 41 is provided on the inner side wall of the travel box 4 away from one end of the first transmission shaft 1, and a second bearing 42 is provided on the inner side wall of the travel box 4 close to one end of the first transmission shaft 1. The second transmission shaft 2 is rotatably connected to the travel box 4 through the first bearing 41 and the second bearing 42. The first bearing 41 and the second bearing 42 provide support for the second transmission shaft 2, and the second transmission shaft 2 can rotate relative to the travel box 4.

[0057] The bottom of the travel box 4 is provided with a first opening, specifically, the bottom of the travel box 4 is an open structure. The travel gear 3 is sleeved on the portion of the second transmission shaft 2 located in the travel box 4, and the bottom of the travel gear 3 extends out of the first opening and meshes with the pin track. The travel box 4 shields the travel gear 3 and the connection between the travel gear 3 and the second transmission shaft 2 to prevent coal ash or other impurities from falling into and affecting the normal connection between the travel gear 3 and the second transmission shaft 2, and also prevents the travel gear 3 from contacting with external objects or operators during rotation to reduce safety hazards.

[0058] Furthermore, a second opening corresponding to the first bearing 41 is provided at one end of the travel box 4 away from the first transmission shaft 1, and an end cover 43 is detachably provided at the second opening. When the second transmission shaft 2 fails or breaks due to overload, maintenance or replacement can be performed through the second opening without disassembling the travel box 4 as a whole, thereby reducing the workload of disassembly and assembly.

[0059] Embodiment 4

[0060] The coal mining machine travel assembly provided in this embodiment is further improved on the basis of the third embodiment.

[0061] like Figure 4 and Figure 5As shown, a guide shoe 44 is provided at the bottom of the travel box 4, and the guide shoe 44 is connected to the pin track and can move along the pin track with the travel gear 3, so that the guide shoe 44 guides and supports the travel gear 3 to prevent the movement direction of the travel gear 3 from being offset and to maintain stable meshing between the travel gear 3 and the pin track. At the same time, the guide shoe 44 can also share the pressure of the travel box 4 on the travel gear 3, thereby reducing the resistance of the travel gear 3 during the rotation process.

[0062] Embodiment 5

[0063] This embodiment provides a coal mining machine travel assembly, which is further improved on the basis of the third embodiment.

[0064] like Figure 6 As shown, a positioning sleeve 5 is sleeved on the second transmission shaft 2, and the positioning sleeve 5 is located between the travel gear 3 and the unloading groove 21 in the axial direction, so as to axially position the travel gear 3 through the positioning sleeve 5. The second bearing 42 is sleeved on the outside of the positioning sleeve 5, so that the positioning sleeve 5 can rotate with the second transmission shaft 2 relative to the travel box 4. Among them, a first boss 51 is provided on the outer side wall of the positioning sleeve 5 in the radial direction, and the two ends of the first boss 51 in the axial direction are respectively against the travel gear 3 and the second bearing 42 to limit the axial displacement of the travel gear 3.

[0065] The end of the first transmission shaft 1 close to the traveling gear 3 is sleeved with a third bearing 113. Specifically, the third bearing 113 is located on the outside of the spline sleeve 11, and the spline sleeve 11 is provided with a second boss 112. The end of the third bearing 113 away from the second bearing 42 abuts against the second boss 112. There is an axial gap between the end of the third bearing 113 close to the second bearing 42 and the second bearing 42. A ferrule 52 is provided in the axial gap, and the two ends of the ferrule 52 along the axial direction abut against the end faces of the second bearing 42 and the third bearing 113 respectively. The axial positioning of the second bearing 42, the third bearing 113, the positioning sleeve 5 and the traveling gear 3 is achieved through the first boss 51, the second boss 112 and the ferrule 52. Among them, the unloading groove 21 is located in the axial gap to prevent the positioning sleeve 5 or the second bearing 42 or the third bearing 113 from axial displacement and blocking the unloading groove 21, thereby affecting the overload protection function of the unloading groove 21.

[0066] Embodiment 6

[0067] The coal mining machine travel assembly provided in this embodiment is used for a coal mining machine, and the coal mining machine travel assembly includes a first transmission shaft 1, a second transmission shaft 2, a travel gear 3, a travel box 4 and a positioning sleeve 5.

[0068] The first transmission shaft 1 and the second transmission shaft 2 are used to transmit the output power of the driving device of the coal mining machine, and the travel gear 3 drives the coal mining machine to move by rotating. Figure 7 As shown, one end of the first transmission shaft 1 is used for transmission connection with the driving device of the coal mining machine, and the other end of the first transmission shaft 1 extends outward from the coal mining machine; one end of the second transmission shaft 2 is transmission connected with the end of the first transmission shaft 1 extending out of the coal mining machine, and the other end of the second transmission shaft 2 extends along the axial direction of the first transmission shaft 1. Specifically, the end of the first transmission shaft 1 extending outward from the coal mining machine is provided with a spline sleeve 11, and the inner side wall of the spline sleeve 11 is provided with an inner spline 111; the end of the second transmission shaft 2 connected to the first transmission shaft 1 is provided with an outer spline 22 along the outer side surface in the circumferential direction, and the outer spline 22 matches the inner spline 111. The end of the second transmission shaft 2 provided with the outer spline 22 extends into the spline sleeve 11, and the transmission connection between the second transmission shaft 2 and the first transmission shaft 1 is realized through the cooperation of the outer spline 22 and the inner spline 111, so that the second transmission shaft 2 can rotate with the first transmission shaft 1 to transmit the output power of the driving device to the travel gear 3. Among them, the length of the first transmission shaft 1 is greater than the length of the second transmission shaft 2.

[0069] The travel box 4 is sleeved on the second transmission shaft 2 for protection. Specifically, a through hole is provided on the side wall of the travel box 4 close to the end of the first transmission shaft 1, and the end of the second transmission shaft 2 away from the first transmission shaft 1 extends into the travel box 4 through the through hole. A first bearing 41 is provided on the inner side wall of the travel box 4 away from the end of the first transmission shaft 1, and a second bearing 42 is provided on the inner side wall of the travel box 4 close to the end of the first transmission shaft 1. The second transmission shaft 2 is rotatably connected to the travel box 4 through the first bearing 41 and the second bearing 42. The first bearing 41 and the second bearing 42 provide support for the second transmission shaft 2, and the second transmission shaft 2 can rotate relative to the travel box 4. Among them, a first opening of an open structure is provided at the bottom of the travel box 4.

[0070] The traveling gear 3 is sleeved on the part of the second transmission shaft 2 located in the traveling box 4, and is connected to the second transmission shaft 2; the bottom of the traveling gear 3 extends out from the first opening, and meshes with the pin rail of the middle groove of the scraper conveyor. The output power of the driving device is transmitted to the traveling gear 3 through the first transmission shaft 1 and the second transmission shaft 2, driving the traveling gear 3 to rotate, so that the pin rail generates a reaction force on the travel, so as to drive the traveling gear 3 to move along the extension direction of the pin rail, and then drive the coal mining machine to move along the extension direction of the pin rail. The traveling gear 3 and the connection between the traveling gear 3 and the second transmission shaft 2 are shielded by the traveling box 4 to prevent coal ash or other impurities from falling into and affecting the normal connection between the traveling gear 3 and the second transmission shaft 2, and to prevent the traveling gear 3 from contacting with external objects or operators during rotation, so as to reduce safety hazards.

[0071] The end of the traveling box 4 away from the first transmission shaft 1 is provided with a second opening corresponding to the first bearing 41, and an end cover 43 is detachably provided at the second opening. When the second transmission shaft 2 fails or breaks due to overload, it can be repaired or replaced through the second opening without disassembling the traveling box 4 as a whole, thereby reducing the workload of disassembly and assembly. The bottom of the traveling box 4 is connected with a guide shoe 44, which is connected to the pin track and can move along the pin track with the traveling gear 3, so that the guide shoe 44 guides and supports the traveling gear 3 to prevent the movement direction of the traveling gear 3 from being offset and to maintain stable meshing between the traveling gear 3 and the pin track. At the same time, the guide shoe 44 can also share the pressure of the traveling box 4 on the traveling gear 3, thereby reducing the resistance of the traveling gear 3 during rotation.

[0072] like Figure 8 As shown, a unloading groove 21 is provided on the second transmission shaft 2, which is arranged along the circumferential direction of the second transmission shaft 2, so that when the second transmission shaft 2 is overloaded, that is, when it is subjected to an overload force, the unloading groove 21 can concentrate stress and cause the second transmission shaft 2 to break at the position of the unloading groove 21, so as to prevent damage to the connection between the second transmission shaft 2 and the first transmission shaft 1.

[0073] The second transmission shaft 2 is sleeved with a positioning sleeve 5, and the positioning sleeve 5 is located between the travel gear 3 and the unloading groove 21 in the axial direction, so as to axially position the travel gear 3 through the positioning sleeve 5. The second bearing 42 is sleeved on the outside of the positioning sleeve 5, so that the positioning sleeve 5 can rotate with the second transmission shaft 2 relative to the travel box 4. Among them, the positioning sleeve 5 is provided with a first boss 51 on the outer side wall in the radial direction, and the two ends of the first boss 51 in the axial direction are respectively against the travel gear 3 and the second bearing 42 to limit the axial displacement of the travel gear 3.

[0074] A third bearing 113 is sleeved on one end of the first transmission shaft 1 close to the traveling gear 3. Specifically, the third bearing 113 is located on the outside of the spline sleeve 11, and a second boss 112 is provided on the spline sleeve 11. The end of the third bearing 113 away from the second bearing 42 abuts against the second boss 112. An axial gap exists between the end of the third bearing 113 close to the second bearing 42 and the second bearing 42. A retaining sleeve 52 is provided in the axial gap, and the two ends of the retaining sleeve 52 along the axial direction abut against the end faces of the second bearing 42 and the third bearing 113, respectively. The axial positioning of the second bearing 42, the third bearing 113, the positioning sleeve 5 and the traveling gear 3 is achieved by the first boss 51, the second boss 112 and the retaining sleeve 52. Among them, the unloading groove 21 is located in the axial gap to prevent the positioning sleeve 5 or the second bearing 42 or the third bearing 113 from axial displacement and blocking the unloading groove 21, thereby affecting the overload protection function of the unloading groove 21.

[0075] The coal mining machine travel assembly in this embodiment can reduce the possibility of damage to the first transmission shaft 1. When an overload occurs, the fracture point of the second transmission shaft 2 is located at the position of the unloading groove 21 to play an overload protection role, making it convenient to disassemble and replace the second transmission shaft 2, which is beneficial to shortening maintenance time, reducing maintenance costs, and reducing the impact of the maintenance process on coal mining operations, which is beneficial to improving the efficiency of coal mining operations.

[0076] Embodiment 7

[0077] A coal mining machine is provided in this embodiment, including a coal mining machine body and a plurality of coal mining machine travel components in any of the above embodiments.

[0078] The coal mining machine body is the main part of the coal mining machine and is used to carry the coal mining operation mechanism. The coal mining machine body is provided with a driving device for outputting power to drive the coal mining machine body to move. The first transmission shaft 1 in each coal mining machine travel assembly is connected to the driving device at one end away from the second transmission shaft 2, so as to transmit the output power of the driving device to the travel gear 3 through the first transmission shaft 1 and the second transmission shaft 2, drive the travel gear 3 to rotate, and then through the meshing between the travel gear 3 and the pin rail, react to the travel gear 3, so that the travel gear 3 moves along the extension direction of the pin rail, and then drive the coal mining machine body to move along the extension direction of the pin rail. Among them, the driving device can include only an engine, or it can include an engine and a reduction mechanism to reduce the output speed of the output end of the driving device.

[0079] In addition, the coal mining machine in this solution also includes all the beneficial effects of the coal mining machine travel assembly in any of the above embodiments, which will not be repeated here.

[0080] The technical solution of the present invention is described in detail above in combination with the accompanying drawings. When an overload occurs, the fracture point of the second transmission shaft can be located at the position of the overload protection structure to reduce the possibility of damage to the first transmission shaft. At the same time, it is easy to disassemble and replace the second transmission shaft, which is beneficial to shorten the maintenance time, reduce the maintenance cost, and improve the efficiency of coal mining operations.

[0081] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0083] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0084] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A coal mining machine travel assembly, used for a coal mining machine, characterized in that: include: a first transmission shaft, one end of which is used for transmission connection with the driving device of the coal mining machine, and the other end of which extends outward from the coal mining machine; a second transmission shaft, one end of which is drivingly connected to an end of the first transmission shaft extending out of the coal mining machine; A travel gear is sleeved on the second transmission shaft and is used to mesh with the pin track of the middle groove of the scraper conveyor. The travel gear rotates under the drive of the first transmission shaft and the second transmission shaft, so that the coal mining machine is driven to move along the pin track through the rotation of the travel gear. Wherein, an overload protection structure is provided on the second transmission shaft, and the overload protection structure is located between the traveling gear and the first transmission shaft, so as to achieve stress concentration at the position of the overload protection structure; The overload protection structure is a relief groove, which is arranged along the circumferential direction of the second transmission shaft, and in the axial direction, the relief groove is located between the connection between the second transmission shaft and the first transmission shaft and the travel gear; The length of the first transmission shaft is greater than the length of the second transmission shaft; A travel box is sleeved on the second transmission shaft, a through hole is provided on a side wall of the travel box facing the first transmission shaft, and a first opening is provided at the bottom of the travel box. Wherein, the second transmission shaft extends into the travel box through the through hole and is rotatably connected to the travel box through the first bearing and the second bearing, the travel gear is arranged at the part of the second transmission shaft located in the travel box, and the bottom of the travel gear extends out through the first opening and meshes with the pin track; A positioning sleeve is sleeved on the second transmission shaft, the positioning sleeve is located between the travel gear and the unloading groove in the axial direction, and a first boss is provided on the outer side wall of the positioning sleeve in the radial direction. Wherein, the second bearing sleeve is arranged on the outer side of the positioning sleeve, and the two ends of the first boss along the axial direction are respectively against the traveling gear and the second bearing; A third bearing is sleeved on one end of the first transmission shaft close to the travel gear, an axial gap exists between the third bearing and the second bearing, and one end of the third bearing away from the second bearing abuts against the second boss of the first transmission shaft; A ferrule is arranged in the axial gap, and two ends of the ferrule along the axial direction are respectively against the second bearing and the third bearing, Wherein, the unloading groove is located in the axial gap.

2. The coal mining machine travel assembly according to claim 1, characterized in that: The end of the first transmission shaft extending outward from the coal mining machine is provided with a spline sleeve, and the inner side wall of the spline sleeve is provided with an internal spline; An outer side surface along the circumferential direction of one end of the second transmission shaft connected to the first transmission shaft is provided with an external spline, and the transmission connection between the second transmission shaft and the first transmission shaft is achieved through the cooperation between the external spline and the internal spline.

3. The coal mining machine travel assembly according to claim 1, characterized in that: The first bearing is located at an end of the travel gear away from the first transmission shaft, and the second bearing is located at an end of the travel gear close to the first transmission shaft; The end of the travel box away from the first transmission shaft is provided with a second opening, and the second opening is arranged corresponding to the first bearing. Wherein, an end cover is provided at the second opening, and the end cover is detachably connected to the traveling box.

4. The coal mining machine travel assembly according to claim 1, characterized in that: Also includes: A guide shoe is arranged at the bottom of the travel box, the guide shoe is connected to the pin track, and can move along the pin track together with the travel gear.

5. A coal mining machine, characterized in that: include: A coal mining locomotive body, wherein the coal mining locomotive body is provided with a driving device; A plurality of coal mining machine traveling assemblies as described in any one of claims 1 to 4, wherein one end of the first transmission shaft of each coal mining machine traveling assembly is transmission-connected to the driving device away from the second transmission shaft, so as to drive the traveling gear in the coal mining machine traveling assembly to rotate through the driving device, thereby driving the coal mining machine body to move along the pin rail.

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