Coal mining machine rocker arm power connection structure

Abstract

The present invention relates to a power connection structure for a rocker arm of a coal mining machine, comprising a fixed reduction gearbox housing and an arm housing, wherein a front-stage cutting transmission mechanism and a rear-stage cutting transmission mechanism are respectively installed on the fixed reduction gearbox housing and the arm housing, wherein the output end of the front-stage cutting transmission mechanism and the input end of the rear-stage cutting transmission mechanism are respectively provided with a front-stage final gear and a rear-stage first gear, wherein the front-stage final gear and the rear-stage first gear are respectively rotatably supported in the fixed reduction gearbox housing and the arm housing, wherein the core of the front-stage final gear and the core of the rear-stage first gear are respectively provided with a front-stage spline hole and a rear-stage spline hole, wherein a spline sleeve with an inner spline and an outer spline is installed in the front-stage spline hole, wherein the inner spline of the spline sleeve and the rear-stage spline hole are respectively spline-connected to the front and rear parts of the same spline shaft. The present invention can improve the reliability of power transmission between an unpowered rocker arm and a fixed reduction gearbox with power.

Description

Technical Field

[0001] The invention relates to a power transmission connection structure between a coal shearer rocker arm and a fixed reduction box, which can improve the reliability of power transmission between the two and is suitable for coal shearers with a short body and a wide mining range. Background Art

[0002] Early hydraulic shearers (such as the MG200) used a matching connection structure that combined a fixed reduction gearbox with cutting power and a swinging rocker arm without cutting power to achieve complete cutting function. The advantage was that the large power section did not need to swing with the rocker arm. This type of shearer can be adapted to mining coal seams with relatively thin lower limits. However, the disadvantage is that the output power of the fixed reduction gearbox is transmitted to the rocker arm via a direct connection (gear meshing). When the rocker arm's support bearing wears, it seriously affects the gear meshing at the transmission connection between the fixed reduction gearbox and the rocker arm, resulting in a significant reduction in transmission reliability. At the same time, the root connection cylinder of the rocker arm frame with this structure is usually subjected to greater force, making it prone to breakage and other problems. Summary of the Invention

[0003] The present invention aims to provide a coal mining machine rocker arm power connection structure, which can improve the reliability of power transmission between the unpowered rocker arm and the powered fixed reduction box.

[0004] The main technical solutions of the present invention are:

[0005] A coal mining machine rocker arm power connection structure includes a fixed reduction gearbox housing and an arm housing, a front-stage cutting transmission mechanism and a rear-stage cutting transmission mechanism are respectively installed on the fixed reduction gearbox housing and the arm housing, the output end of the front-stage cutting transmission mechanism and the input end of the rear-stage cutting transmission mechanism are respectively provided with a front-stage final gear and a rear-stage first gear, the front-stage final gear and the rear-stage first gear are respectively rotatably supported in the fixed reduction gearbox housing and the arm housing, the core of the front-stage final gear and the core of the rear-stage first gear are respectively provided with a front-stage spline hole and a rear-stage spline hole, a spline sleeve with an inner spline and an outer spline is installed in the front-stage spline hole, the inner spline of the spline sleeve and the rear-stage spline hole are respectively spline-connected to the front and rear parts of the same spline shaft.

[0006] The arm housing may include a transmission housing, a front support arm and a rear support arm, the transmission housing is L-shaped, the rear-stage first gear is located at the free end of the left and right extension sections of the transmission housing, the front support arm and the rear support arm are respectively located in front and rear of the left and right extension sections of the transmission housing, the front support arm and the rear support arm are both cantilever structures connected to the transmission housing at one end, the front support arm and the rear support arm are respectively provided with a front articulated interface structure and a rear articulated interface structure, the articulation axis of the front articulated interface structure, the articulation axis of the rear articulated interface structure and the center line of the spline shaft coincide and extend forward and backward, the front support arm and the rear support arm are respectively articulated to the fixed reduction gearbox housing through the front articulated interface structure and the rear articulated interface structure.

[0007] The front support arm can be L-shaped, and the front hinge interface structure is arranged at the free ends of the left and right extension sections of the front support arm. The rear ends of the front and rear extension sections of the front support arm are connected to the transmission box body. The top surfaces of the front and rear extension sections of the front support arm are preferably inclined surfaces, and the height decreases as it is farther away from the free end.

[0008] The fixed reduction gearbox housing is provided with a front articulated seat and a rear articulated seat, both of which are double-ear seat structures. The free ends of the front support arm and the rear support arm are respectively matched with the front articulated seat and the rear articulated seat and are respectively penetrated by a front pin shaft and a rear pin shaft to realize articulation.

[0009] The front support arm and the rear support arm are respectively provided with a front through hole and a rear through hole, and the front transition sleeve and the rear transition sleeve are coaxially fixedly installed in the front through hole and the rear through hole respectively, and a pair of front wear-resistant sleeves and a pair of rear wear-resistant sleeves are respectively fixedly installed in the ear holes of the front hinge seat and the rear hinge seat, the front pin shaft passes through the front transition sleeve and the front wear-resistant sleeve, and the rear pin shaft passes through the rear transition sleeve and the rear wear-resistant sleeve, the front pin shaft and the rear pin shaft are respectively clearance-matched with the front transition sleeve and the rear transition sleeve, and the front pin shaft and the rear pin shaft are respectively tightly matched with the front wear-resistant sleeve and the rear wear-resistant sleeve.

[0010] The rear hinged ear of the front hinged seat is just embedded between the front support arm and the transmission box and maintains a gap between the front support arm and the transmission box. The front-stage final gear is installed in the rear hinged ear of the front hinged seat. An annular axial baffle is provided in the inner hole of the rear hinged ear of the front hinged seat. The front wear-resistant sleeve and the front pin shaft are located in front of the axial baffle, and the front-stage final gear and the spline sleeve are located behind the axial baffle. A central through hole is provided in the front pin shaft, and the internal spline of the spline sleeve is arranged in the inner hole of its rear section. The front inner hole of the spline sleeve is a light hole. A positioning sleeve is installed in the central through hole. The rear end of the positioning sleeve is inserted into the light hole of the spline sleeve and axially limits the front end face core of the spline shaft. The positioning sleeve is axially limited in the central through hole by the front end cover fixed on the front hinged ear of the front hinged seat. The positioning sleeve does not contact the spline sleeve. An end face seal is provided between the rear hinged ear of the front hinged seat and the rear-stage cutting transmission mechanism and / or the transmission box.

[0011] An annular flange is provided in the middle of the positioning sleeve, and the outer cylindrical surface of the annular flange is gap-matched with the central through hole and the inner hole of the axial baffle, and a seal is provided between the matching surfaces.

[0012] The front support arm and the rear support arm are also provided with a front automatic lubrication device and a rear automatic lubrication device respectively. The lubrication points of the front automatic lubrication device and the rear automatic lubrication device are respectively located on the inner hole surfaces of the front transition sleeve and the rear transition sleeve.

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

[0014] The front-stage cutting transmission mechanism transmits power to the rear-stage cutting transmission mechanism through a spline connection structure. Since multiple spline connection structures with side clearance are adopted, the radial floating amount is increased, and since the related parts forming the spline connection structure can be automatically centered, the radial offset caused by the wear of the rotating support surface at both ends of the axial direction of the transmission parts has little effect on the transmission engagement. The transmission structure between the front and rear-stage cutting transmission mechanisms has improved adaptability to the wear of the rotating support surfaces at both ends of the axial direction, so the reliability of power transmission between the rocker arm and the fixed reduction box can be significantly improved.

[0015] Since multiple support connection points are set between the arm housing and the fixed reduction gearbox housing, and these support connection points are respectively arranged in front of and behind the power transmission connection point, the radial displacement caused by wear at the front and rear support connection points has less impact on the power transmission connection point located between the two. Therefore, this support connection structure can provide more reliable protection for the transmission of cutting power.

[0016] By adding front automatic lubrication devices and rear automatic lubrication devices at the front and rear support connection points, automatic, effective and long-term lubrication of the support load-bearing surface can be guaranteed, wear can be reduced, and the service life of the support connection points can be extended.

[0017] The top and bottom thicknesses of the front and rear support arms are both smaller than those of the transmission housing and significantly smaller than the diameter of the supporting roller. This minimizes interference between the front and rear support arms and the top coal platform when the boom housing is in the upper mining limit position, enabling higher mining heights. For mining extremely thin or shallow coal seams, the rocker arm structure of the present invention achieves both a low lower mining limit and a high upper mining limit, thereby creating a wider mining range and being suitable for short-body coal shearers.

[0018] The front-stage final gear is installed in the rear articulated ear of the front articulated seat, so that the front-stage cutting transmission mechanism and the front articulated structure share a housing. The internal space of the shared housing is functionally partitioned by the provision of axial baffles, making the structure of the connection between the arm housing and the fixed reduction box housing as simple and compact as possible. By setting the front pin shaft as a hollow structure, on the one hand, sufficient space for disassembly and assembly of the spline shaft is provided, and this disassembly and assembly space is located to the side of the drum, without occupying the coal passage and not affecting coal flow. On the other hand, when the coal mining machine rocker arm is in normal use, this disassembly and assembly space can be used to install a positioning structure to axially limit the spline shaft, achieving multiple goals at one stroke.

[0019] By arranging an end face seal between the rear articulated ear of the front articulated seat and the rear-stage cutting transmission mechanism and / or the transmission box, and arranging a seal at the gap fit between the annular flange in the middle of the positioning sleeve and the central through hole of the front pin shaft, impurities such as water and coal powder can be effectively prevented from entering the spline connection structure from the front and rear, so as to ensure the cleanliness and lubrication of the spline connection structure, extend the service life of the spline connection structure, and improve the working reliability of the spline connection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of an embodiment of the present invention;

[0021] Figure 2 A front view of an embodiment of the arm housing;

[0022] Figure 3 for Figure 2 A top sectional view of

[0023] Figure 4 A partial cross-sectional view of an embodiment of the fixed reduction gearbox housing;

[0024] Figure 5 It is an enlarged view of the power transmission structure between the front-stage cutting transmission mechanism and the rear-stage cutting transmission mechanism.

[0025] Reference numerals:

[0026] 1. Boom housing; 11. Transmission housing; 12. Front support arm; 13. Rear support arm; 141. Front transition sleeve; 142. Rear transition sleeve; 151. Front automatic lubrication device; 152. Rear automatic lubrication device;

[0027] 2. Fixed gearbox housing; 21. Front hinge seat; 211. Front hinge lug of front hinge seat; 212. Rear hinge lug of front hinge seat; 22. Rear hinge seat; 231. Front wear-resistant sleeve; 232. Rear wear-resistant sleeve;

[0028] 31. Splined sleeve; 32. Splined shaft; 33. Positioning sleeve; 34. Seal; 35. End seal; 36. Front stage final gear; 361. Front stage spline hole; 37. Rear stage first gear; 371. Rear stage spline hole;

[0029] 41. Front pin; 42. Rear pin;

[0030] 5. Roller. DETAILED DESCRIPTION

[0031] The present invention discloses a coal mining machine rocker arm power connection structure, such as Figure 1-5 As shown, it includes a fixed reduction gearbox housing 2 and a boom housing 1, on which the front-stage cutting transmission mechanism and the rear-stage cutting transmission mechanism are respectively installed. The output end of the front-stage cutting transmission mechanism and the input end of the rear-stage cutting transmission mechanism are respectively provided with a front-stage final gear 36 and a rear-stage first gear 37, and the front-stage final gear and the rear-stage first gear are respectively rotatably supported in the fixed reduction gearbox housing and the boom housing. The core of the front-stage final gear and the core of the rear-stage first gear are respectively provided with a front-stage spline hole 361 and a rear-stage spline hole 371. A spline sleeve 31 with internal and external splines is installed in the front-stage spline hole, and the external splines of the spline sleeve match the front-stage spline hole. The internal splines of the spline sleeve and the rear-stage spline hole are respectively spline-connected to the front and rear parts of the same spline shaft 32. The rotation of the front stage final gear drives the rotation of the spline sleeve, the spline sleeve drives the rotation of the spline shaft, and the spline shaft drives the rotation of the rear stage first gear, thereby realizing the transmission of power from the front stage cutting transmission mechanism to the rear stage cutting transmission mechanism.

[0032] A primary spline transmission is formed between the front-stage final gear and the spline sleeve, while a secondary spline transmission is formed between the spline sleeve and the spline shaft, and then between the spline shaft and the rear-stage first gear. Due to the use of multiple spline connection structures with side clearance fits, radial float is increased. Furthermore, since the related parts forming the spline connection structure are self-centering, radial offset caused by wear of the rotating support surfaces at both ends of the axial direction of the transmission parts has a smaller impact on the transmission meshing. In other words, the transmission structure between the front and rear-stage cutting transmission mechanisms is more adaptable to wear of the rotating support surfaces at both ends of the axial direction. As a result, the reliability of power transmission between the rocker arm and the fixed reduction box can be significantly improved.

[0033] In the embodiment shown in the accompanying drawings, the rear end of the front stage final gear is supported on the front bearing seat through a bearing, the front bearing seat is mounted on the fixed reduction gearbox housing, and the front end of the rear stage first gear is supported on the rear bearing seat through a bearing, and the rear bearing seat is mounted on the arm housing.

[0034] The arm housing 1 may include a transmission housing 11, a front support arm 12 and a rear support arm 13. The transmission housing is L-shaped, and the rear first gear is located at the free ends of the left and right extension sections of the transmission housing (corresponding to Figure 2 The right end of the middle transmission case 11), the free ends of the front and rear extension sections of the transmission case are cylindrical, and the matching roller 5 is mounted on the front and rear extension sections of the transmission case. The front support arm and the rear support arm are respectively located in the front and rear of the left and right extension sections of the transmission case, and the front support arm and the rear support arm are cantilever structures with one end connected to the transmission case. One end of the front and rear extension sections of the front support arm and the rear support arm away from the transmission case is a free end. The front support arm and the rear support arm are respectively provided with a front hinge interface structure and a rear hinge interface structure, and the hinge axis of the front hinge interface structure, the hinge axis of the rear hinge interface structure and the center line of the spline shaft coincide with each other, and extend in the front and rear directions like the rotation axis of the roller. The front support arm and the rear support arm are respectively hinged to the fixed reduction gearbox housing through the front hinge interface structure and the rear hinge interface structure. In this embodiment, the front support arm, the rear support arm and the transmission case are an integrated structure.

[0035] Because the support connection points between the boom housing and the fixed reduction gearbox housing are located in front of and behind the power transmission connection point, radial displacement caused by wear at the front and rear support connection points has less impact on the power transmission connection point located between them. Therefore, this support connection structure provides more reliable protection for the transmission of cutting power. Furthermore, the average force point of the drum is located between the front and rear support connection points, which improves the force distribution of the boom housing.

[0036] The top surfaces of the front and rear support arms are preferably no higher than the top surface of the transmission housing, and the bottom surfaces of the front and rear support arms are preferably no lower than the bottom surface of the transmission housing. That is, the upper and lower thicknesses of the front and rear support arms are both smaller than the transmission housing. This can minimize interference between the front and rear support arms and the top coal platform when the arm housing is in the upper cutting limit position, thereby allowing for higher mining heights. For mining extremely thin or thin coal seams, the rocker arm of the present invention can meet both a lower mining lower limit and a higher mining upper limit, thereby forming a wider mining range and being suitable for short-body coal mining machines.

[0037] The front support arm may be L-shaped, with the free ends of the left and right extensions of the front support arm also being the free ends of the front support arm. The front hinge interface structure is disposed at the free ends of the left and right extensions of the front support arm, and the rear ends of the front and rear extensions of the front support arm are connected to the transmission housing. The top surfaces of the front and rear extensions of the front support arm are preferably inclined, with the height decreasing as the front support arm moves away from the free ends, i.e., the front support arm decreases as the front support arm moves closer to the drum.

[0038] The fixed reduction gearbox housing is provided with a front articulated seat 21 and a rear articulated seat 22, both of which are double-ear seat structures. The free ends of the front support arm and the rear support arm respectively cooperate with the front articulated seat and the rear articulated seat and are respectively penetrated by a front pin shaft 41 and a rear pin shaft 42 to achieve articulation.

[0039] The front support arm and rear support arm are respectively provided with a front through-hole and a rear through-hole. The front through-hole and the rear through-hole are coaxially fixedly mounted in the front through-hole and the rear through-hole, respectively, with a front transition sleeve 141 and a rear transition sleeve 142 being coaxially fixedly mounted in the front through-hole and the rear through-hole, respectively. The front transition sleeve and the front through-hole form a front hinged interface structure, while the rear transition sleeve and the rear through-hole form a rear hinged interface structure. A pair of front wear-resistant sleeves 231 and a pair of rear wear-resistant sleeves 232 are respectively fixedly mounted in the ear holes of the front hinge seat and the rear hinge seat. The front pin passes through the front transition sleeve and the front wear-resistant sleeve, while the rear pin passes through the rear transition sleeve and the rear wear-resistant sleeve. The front pin and the rear pin have a clearance fit with the front transition sleeve and the rear transition sleeve, respectively. The front pin and the rear pin have a tight fit with the front wear-resistant sleeve and the rear wear-resistant sleeve, respectively.

[0040] The rear hinge ear 212 of the front hinge seat is just embedded between the front support arm and the transmission housing, and maintains a gap between the front support arm and the transmission housing to ensure relative swing between the arm housing and the front end gear. The front-stage final gear is installed in the rear hinge ear of the front hinge seat. An annular axial baffle is provided in the inner hole of the rear hinge ear of the front hinge seat, the front wear-resistant sleeve and the front pin are located in front of the axial baffle, and the front-stage final gear and the spline sleeve are located behind the axial baffle. In this embodiment, the axial baffle is a part of the entity of the rear hinge ear of the front hinge seat, and is a circular ring structure that protrudes radially toward the center of the ear hole. A central through hole is provided in the front pin, and the inner spline of the spline sleeve 31 is provided in the rear section inner hole of the spline sleeve, and the front section inner hole is a light hole. A positioning sleeve 33 is installed in the central through hole, and the positioning sleeve is cup-shaped, with a sealing end at the rear end. The sealed end (i.e., rear end) of the locating sleeve is inserted through an axial barrier into the light hole of the spline sleeve, axially limiting the front end core of the spline shaft 32. In this embodiment, a wear-resistant pad is fixed to the rear end of the locating sleeve, which uses the wear-resistant pad to axially limit the spline shaft. The spline shaft contacts and rotates relative to the wear-resistant pad. The locating sleeve is axially limited in the central through hole by a front end cap fixed to the front hinge ear 211 of the front hinge seat. The locating sleeve does not contact the spline sleeve.

[0041] An end face seal 35 (e.g., a sealing groove and a sealing ring installed on the front face of the high-speed end) is provided between the rear hinge lug 212 of the front hinge seat and the rear-stage cutting transmission mechanism and / or the transmission housing to prevent impurities such as water and coal dust from entering the spline connection structure from the rear end. In the embodiment shown in the accompanying drawings, the end face seal is provided at the joint between the front face of the rear bearing seat and the front face of the transmission housing.

[0042] When the spline shaft is worn, the positioning sleeve 33 is removed from the front side to clear the cylindrical space in front of the spline shaft 32. The spline shaft can then be removed and replaced smoothly. In addition, the cylindrical space is located on the side of the drum and does not occupy the space above the coal passage of the conveyor trough, thus not affecting coal feeding and mining.

[0043] In the embodiment shown in the accompanying drawings, the ear holes of the front hinged ears of the rear hinged seat are blind holes with an open rear end. A rear end cap is fixedly mounted on the rear hinged ears of the rear hinged seat. The blind ear holes and the rear end cap axially limit the rear pin. The rear end of the rear-stage first gear is directly supported on the transmission housing via a bearing, and the rear end of the high-speed end of the transmission housing is not connected. This reduces the ingress of dust and other impurities between the relatively moving parts and minimizes the relative motion of the related parts.

[0044] An annular flange is provided in the center of the locating sleeve. The outer cylindrical surface of the flange is clearance-matched with both the central through-hole and the inner bore of the axial baffle, with a seal 34 provided between the mating surfaces. In this embodiment, a sealing groove is provided on the outer cylindrical surface of the flange, which houses a sealing ring. This seal seals the locating sleeve against the front pin and the rear hinge lug of the front hinge seat, preventing impurities such as water and coal dust from entering the spline connection structure from the front end. This seal, combined with the aforementioned end face seal, ensures cleanliness and lubrication of the spline connection structure, thereby extending the service life of the spline connection structure.

[0045] The rear-stage spline hole is preferably a blind hole, the hole opening of which is on the front end face of the rear-stage first gear, and the bottom surface of the rear-stage spline hole is the positioning surface of the rear end face of the spline shaft.

[0046] The front and rear support arms can also be equipped with front and rear automatic lubrication devices 151 and 152, respectively. The target lubrication points of the front and rear automatic lubrication devices can be located on the inner bore surfaces of the front and rear transition sleeves, respectively. By adding the front and rear automatic lubrication devices at the front and rear support connection points, automatic, effective, and long-term lubrication of the support bearing surfaces can be ensured, reducing wear and extending the service life of the support connection points. In the embodiment shown in the accompanying drawings, the front and rear automatic lubrication devices are installed at the free ends of the front and rear support arms, respectively.

[0047] Furthermore, seals are provided between both ends of the front transition sleeve and the front support arm and the front pin, and seals are provided between both ends of the rear transition sleeve and the rear support arm and the rear pin. In this embodiment, annular sealing grooves are provided at both axial ends of the outer cylindrical surface and inner hole surface of the front transition sleeve, and annular sealing grooves are provided at both axial ends of the outer cylindrical surface and inner hole surface of the rear transition sleeve. Sealing rings are provided in the sealing grooves to achieve the above-mentioned seals.

[0048] The front in this article refers to the direction closer to the coal wall during coal mining operations.

Claims

1. A coal mining machine rocker arm power connection structure, characterized by: It includes a fixed reduction gearbox housing and a boom housing, on which a front-stage cutting transmission mechanism and a rear-stage cutting transmission mechanism are respectively installed, the output end of the front-stage cutting transmission mechanism and the input end of the rear-stage cutting transmission mechanism are respectively provided with a front-stage final gear and a rear-stage first gear, the front-stage final gear and the rear-stage first gear are respectively rotatably supported in the fixed reduction gearbox housing and the boom housing, the core of the front-stage final gear and the core of the rear-stage first gear are respectively provided with a front-stage spline hole and a rear-stage spline hole, a spline sleeve with an inner spline and an outer spline is installed in the front-stage spline hole, the inner spline of the spline sleeve and the rear-stage spline hole are respectively connected to the front and rear splines of the same spline shaft, the boom housing includes The transmission case comprises a transmission case, a front support arm and a rear support arm, the transmission case is L-shaped, the rear-stage first gear is located at the free end of the left and right extension sections of the transmission case, the front support arm and the rear support arm are respectively located in front and rear of the left and right extension sections of the transmission case, the front support arm and the rear support arm are both cantilever structures connected to the transmission case at one end, the front support arm and the rear support arm are respectively provided with a front articulated interface structure and a rear articulated interface structure, the articulation axis of the front articulated interface structure, the articulation axis of the rear articulated interface structure and the center line of the spline shaft coincide and extend forward and backward, the front support arm and the rear support arm are respectively articulated to the fixed reduction gearbox housing through the front articulated interface structure and the rear articulated interface structure.

2. The coal mining machine rocker arm power connection structure according to claim 1, characterized in that: The front support arm is L-shaped, and the front hinge interface structure is arranged at the free ends of the left and right extension sections of the front support arm. The rear ends of the front and rear extension sections of the front support arm are connected to the transmission box body. The top surfaces of the front and rear extension sections of the front support arm are inclined, and the height decreases as it is farther away from the free end.

3. The coal mining machine rocker arm power connection structure according to claim 2, characterized in that: The fixed reduction gearbox housing is provided with a front articulated seat and a rear articulated seat, both of which are double-ear seat structures. The free ends of the front support arm and the rear support arm are respectively matched with the front articulated seat and the rear articulated seat and are respectively penetrated by a front pin shaft and a rear pin shaft to realize articulation.

4. The coal mining machine rocker arm power connection structure according to claim 3, characterized in that: The front support arm and the rear support arm are respectively provided with a front through hole and a rear through hole, and the front transition sleeve and the rear transition sleeve are coaxially fixedly installed in the front through hole and the rear through hole respectively, and a pair of front wear-resistant sleeves and a pair of rear wear-resistant sleeves are respectively fixedly installed in the ear holes of the front hinge seat and the rear hinge seat, the front pin shaft passes through the front transition sleeve and the front wear-resistant sleeve, and the rear pin shaft passes through the rear transition sleeve and the rear wear-resistant sleeve, the front pin shaft and the rear pin shaft are respectively clearance-matched with the front transition sleeve and the rear transition sleeve, and the front pin shaft and the rear pin shaft are respectively tightly matched with the front wear-resistant sleeve and the rear wear-resistant sleeve.

5. The coal mining machine rocker arm power connection structure according to claim 4, characterized in that: The rear hinged ear of the front hinged seat is just embedded between the front support arm and the transmission box and maintains a gap between the front support arm and the transmission box. The front-stage final gear is installed in the rear hinged ear of the front hinged seat. An annular axial baffle is provided in the inner hole of the rear hinged ear of the front hinged seat. The front wear-resistant sleeve and the front pin shaft are located in front of the axial baffle, and the front-stage final gear and the spline sleeve are located behind the axial baffle. A central through hole is provided in the front pin shaft, and the internal spline of the spline sleeve is arranged in the inner hole of its rear section. The front inner hole of the spline sleeve is a light hole. A positioning sleeve is installed in the central through hole. The rear end of the positioning sleeve is inserted into the light hole of the spline sleeve and axially limits the front end face core of the spline shaft. The positioning sleeve is axially limited in the central through hole by the front end cover fixed on the front hinged ear of the front hinged seat. The positioning sleeve does not contact the spline sleeve. An end face seal is provided between the rear hinged ear of the front hinged seat and the rear-stage cutting transmission mechanism and / or the transmission box.

6. The coal mining machine rocker arm power connection structure according to claim 5, characterized in that: An annular flange is provided in the middle of the positioning sleeve, and the outer cylindrical surface of the annular flange is gap-matched with the central through hole and the inner hole of the axial baffle, and a seal is provided between the matching surfaces.

7. The coal mining machine rocker arm power connection structure according to claim 1, 2, 3, 4, 5 or 6, characterized in that: The rear stage spline hole is a blind hole, the hole opening of which is on the front end face of the rear stage first gear, and the bottom surface of the rear stage spline hole is the positioning surface of the rear end face of the spline shaft.

8. The rocker arm power connection structure of a coal mining machine according to claim 4, 5 or 6, characterized in that: The front support arm and the rear support arm are also provided with a front automatic lubrication device and a rear automatic lubrication device respectively. The lubrication points of the front automatic lubrication device and the rear automatic lubrication device are respectively located on the inner hole surfaces of the front transition sleeve and the rear transition sleeve.

9. The coal mining machine rocker arm power connection structure according to claim 7, characterized in that: The front support arm and the rear support arm are also provided with a front automatic lubrication device and a rear automatic lubrication device respectively. The lubrication points of the front automatic lubrication device and the rear automatic lubrication device are respectively located on the inner hole surfaces of the front transition sleeve and the rear transition sleeve.

10. The coal mining machine rocker arm power connection structure according to claim 8, characterized in that: Seals are provided between the two ends of the front transition sleeve and the front support arm and the front pin shaft, and seals are provided between the two ends of the rear transition sleeve and the rear support arm and the rear pin shaft.

11. The coal mining machine rocker arm power connection structure according to claim 9, characterized in that: Seals are provided between the two ends of the front transition sleeve and the front support arm and the front pin shaft, and seals are provided between the two ends of the rear transition sleeve and the rear support arm and the rear pin shaft.

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