Compact drive connection structure of the cutting main body of a shearer

Abstract

The present invention relates to a compact drive connection structure for the cutting main body of a shearer, which includes a first-stage planetary mechanism and a fixed-axis gear. The inner gear ring of the first-stage planetary mechanism extends axially forward to form a cylindrical hollow housing. The fixed-axis gear is installed in the cavity of the hollow housing. One end of the hollow housing close to the first-stage planetary mechanism is provided with a ring-shaped boss that projects into the cavity. The rear end of the fixed-axis gear is rotatably supported on the ring-shaped boss. The rear part of the fixed-axis gear is provided with a spline hole with an open rear end. The sun gear and the planet carrier of the first-stage planetary mechanism are respectively its input end and output end. A spline hole is provided at the center of the planet carrier. The spline holes on the fixed-axis gear and the planet carrier are simultaneously spline-connected to the front and rear splines of a spline shaft. An opening is provided on the side wall of the hollow housing. The present invention helps to reduce the overhang of the fuselage, improve the center-of-gravity distribution state of the shearer, and solve the problems of the layout of the cutting drive system and the center-of-gravity problem of the overhanging fuselage caused by high power.

Description

Technical Field

[0001] The present invention relates to a compact drive connection structure for the cutting main body of a shearer, and is particularly applicable to high-power shearers for thin or extremely thin coal seams with a suspended fuselage structure. Background Art

[0002] For shearers capable of mining the lower limit of thin coal seams, due to the requirements of the coal passing channel above the conveyor trough, it is almost impossible to arrange large-sized parts. In existing shearers, the fuselage is usually arranged in the space in front of the conveyor (i.e., on the coal wall side of the conveyor, between the left and right drums), that is, a suspended fuselage structure. However, the main problem brought about by this structure is that the center of gravity is biased towards the coal wall side, resulting in frequent damage to the traveling system and the like. In response to this problem, the industry has proposed a semi-suspended fuselage structure, but overall, the height of the machine surface is still relatively high, and it cannot well meet the mining requirements of extremely thin coal seams. Especially when used in high-power shearers for extremely thin coal seams, the gaps between the upper and lower parts of the fuselage and the roof and floor as well as the supports are relatively small. Even if a short fuselage is used to attempt to improve the adaptability of the shearer to the mining environment, the layout of the cutting motor, the cutting drive system, and the lifting cylinder is still a difficult point, and it cannot well meet the spatial layout requirements.

[0003] Currently, there is no structure that can effectively solve the center of gravity problem of the suspended fuselage and the structural layout problem of the high-power cutting drive system. Summary of the Invention

[0004] The present invention aims to provide a compact drive connection structure for the cutting main body of a shearer, which helps to reduce the overhang degree of the fuselage, improve the center of gravity distribution state of the shearer, and solve the layout problem of the cutting drive system and the center of gravity problem of the suspended fuselage brought about by high power.

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

[0006] A compact drive connection structure for the cutting main body of a shearer, comprising a first-stage planetary mechanism and a spur gear. The internal gear ring of the first-stage planetary mechanism extends axially forward to form a cylindrical hollow housing. The spur gear is installed in the cavity of the hollow housing. One end of the hollow housing close to the first-stage planetary mechanism is provided with a circular boss that extends into the cavity. The rear end of the spur gear is rotatably supported on the circular boss. A spline hole with an open rear end is provided at the rear of the spur gear. The sun gear and the planet carrier of the first-stage planetary mechanism are its input end and output end respectively. A spline hole is provided at the center of the planet carrier. The spline holes on the spur gear and the planet carrier are simultaneously spline-connected to the front and rear splines of a spline shaft. An opening is provided on the side wall of the hollow housing.

[0007] A flange is provided at the front end of the hollow housing, and a plurality of positioning pin holes are provided on the flange.

[0008] The compact drive connection structure of the shearer cutting main body further includes a fixed reduction gearbox housing. The hollow housing is fixedly installed in the fixed reduction gearbox housing. The hollow housing and the internal gear ring of the first-stage planetary mechanism are radially positioned by the clearance fit between their outer cylindrical surfaces and the corresponding mounting holes of the fixed reduction gearbox housing. The hollow housing is axially positioned by the flange, and the circumferential positioning between the flange and the fixed reduction gearbox housing is achieved by positioning pins.

[0009] Three mounting holes, namely a front hole, a middle hole, and a rear hole, may be provided in the fixed reduction gearbox housing. The front end and the rear end of the hollow housing are respectively in clearance fit with the front mounting hole and the middle mounting hole, and the rear end of the internal gear ring of the first-stage planetary mechanism is in clearance fit with the rear mounting hole. And seals are provided between the mating surfaces at each clearance fit.

[0010] The opening on the side wall of the hollow housing can face left or right.

[0011] The width of the opening on the side wall of the hollow housing is preferably equal to the inner diameter of the hollow housing. The inner walls above and below the opening are both flat and tangent to the right or left semi-cylindrical side wall of the hollow housing, and the three sides enclose a U-shaped opening facing left or right.

[0012] An idle gear is also installed in the fixed reduction gearbox housing. The idle gear is externally meshed with the fixed shaft gear, and a part of the idle gear enters the cavity of the hollow housing from the opening on the side wall of the hollow housing.

[0013] The compact drive connection structure of the shearer cutting main body may further include a pump speed increasing drive system. The pump speed increasing drive system includes a second-stage series planetary speed increasing mechanism and a first-stage fixed shaft gear speed increasing mechanism that are sequentially drive-connected. The power input end and the power output end of the second-stage series planetary speed increasing mechanism are respectively the planet carrier of the first-stage planetary mechanism and the sun gear of the second-stage planetary mechanism. The power input end and the power output end of the first-stage fixed shaft gear speed increasing mechanism are respectively the head gear and the end gear. Two stepped grooves with a large front and a small rear are provided at the front end of the fixed shaft gear. The internal gear ring of the first-stage planetary mechanism is installed in the front groove and is fixed relative to the hollow housing. The rear end of the planet carrier of the first-stage planetary mechanism is provided with an external spline, and this external spline is engaged with the internal spline provided in the rear groove to form a spline connection.

[0014] The pump speed increasing transmission system may further include an end cover, which is fixedly connected to the hollow shell from the front, and the appearance of the end cover is a stepped shape with a larger front and a smaller rear. The front and rear parts of the end cover are respectively provided with a front chamber open in the front and a rear chamber open in the rear, and the front and rear chambers are communicated with each other. The rear part of the end cover is inserted into the front groove of the fixed axis gear, and is overlapped and fixedly connected with the inner gear ring of the first-stage planetary mechanism front and back. The main body of the second-stage planetary mechanism is installed in the rear chamber of the end cover, and the rear part of the end cover is provided with an internal gear, and the rear part of the end cover serves as the inner gear ring of the second-stage planetary mechanism with the aid of the internal gear. The first-stage fixed axis gear speed increasing mechanism is installed in the front chamber of the end cover, and the output end of the sun gear of the second-stage planetary mechanism extends forward into the core of the head end gear and is splined therewith.

[0015] An idler gear may also be provided between the head gear and the tail gear, and the idler gear is externally meshed with the head gear and the tail gear. The front part of the end cover is provided with three parallel mounting holes, namely the first mounting hole, the second mounting hole and the third mounting hole. The head gear, the idler gear and the tail gear are respectively located in the first, the second and the third mounting holes. A small end cover is fixedly installed on the front end surface of the end cover, and the small end cover closes the first mounting hole from the front.

[0016] The beneficial effects of the present invention are:

[0017] The inner gear ring of the primary planetary mechanism is extended to form a cylindrical hollow shell with a notch on the side, and the fixed axis gear connected to the primary planetary mechanism is installed in the hollow shell, and only an annular boss is set between the fixed axis gear and the primary planetary mechanism to support the bearing. The structure is simple, the axial space occupied is small, and the fixed axis gear can be as close to the primary planetary mechanism as possible. Since the compact transmission connection structure of the main cutting part of the coal mining machine is located in front of the conveyor when used on the coal mining machine, and the primary planetary mechanism is closer to the support leg or shovel plate of the coal mining machine, the closer the fixed axis gear is to the primary planetary mechanism, the more the center of gravity of the coal mining machine is offset to the goaf side, and the closer it is to the support leg or shovel plate, the more favorable it is to the support stability of the coal mining machine. Since the primary planetary mechanism and the fixed axis gear are large-sized and heavy-weight parts in the cutting transmission system, the greater the power of the coal mining machine, the more obvious the improvement effect of the above structure on the center of gravity of the coal mining machine.

[0018] Setting the flange at the front end rather than the rear end of the hollow shell can avoid occupying a large amount of connection and installation space at the rear end of the hollow shell. On the one hand, it can make the fixed-axis gear and the first-level planetary mechanism closer to the supporting leg (or shovel plate) of the coal mining machine, which is beneficial to the shift of the center of gravity of the coal mining machine to the goaf side. On the other hand, it is beneficial to maintain a sufficient safety distance between the first-level planetary mechanism and the front beam of the bracket when the three machines cooperate.

[0019] Set the width (perpendicular to the axial direction) of the opening on the side wall of the hollow housing to be equal to the inner diameter of the hollow housing, which can accommodate larger-sized gears for external meshing with the fixed-axis gear, and these gears can be disassembled and assembled smoothly.

[0020] By setting the speed-increasing drive system for the pump, power is led out from the fixed-axis gear of the cutting system and transmitted to the gear pump, which can replace the traditional pump motor to provide power for the gear pump in the hydraulic system of the shearer. Therefore, there is no need to separately equip an external power source for the gear pump.

[0021] Adopting the speed-increasing drive system for the pump can re-increase the speed at a certain node after deceleration, and finally increase the rotational speed of the gear pump to the required rotational speed to achieve the normal working state of the gear pump. Adopting the two-stage series planetary speed-increasing mechanism can achieve a larger speed ratio with a smaller space occupation, which is very beneficial for saving installation space and making the system more compact.

[0022] Since the two-stage series planetary speed-increasing mechanism is arranged in the groove of the fixed-axis gear and the first-stage fixed-axis gear speed-increasing mechanism is arranged in the front chamber of the end cover, the installation space of the compact power system for the pump is further saved, especially reducing the space occupation in the axial direction. The gear pump power system realizes a compact setting. When the hydraulic system and the lifting cylinder share a chamber, this compact setting can ensure that there is enough space for the lifting cylinder in the front and back directions. The compact setting also enables the gear pump power system to be applicable to shearers for thin or extremely thin coal seams. Brief Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of an embodiment of the present invention;

[0024] Figure 2 It is Figure 1 the A-A sectional view of

[0025] Figure 3 It is a schematic layout diagram of the present invention in the fixed reduction gear housing of the shearer;

[0026] Figure 4 It is a side view of the shearer adopting the present invention;

[0027] Figure 5 It is a layout diagram of an embodiment of the speed-increasing drive system for the pump;

[0028] Figure 6 It is a detailed structural diagram of an embodiment of the speed-increasing drive system for the pump;

[0029] Figure 7 It is a partial structural schematic diagram of the fixed-axis gear;

[0030] Figure 8 Schematic structural diagram of an embodiment of the end cover;

[0031] Reference numerals:

[0032] 1. Speed-increasing drive system for pump; 11. Two-stage series planetary speed-increasing mechanism; 111. Planet carrier of the first-stage planetary mechanism; 112. Sun gear of the first-stage planetary mechanism; 113. Internal gear ring of the first-stage planetary mechanism; 114. Planet carrier of the second-stage planetary mechanism; 115. Sun gear of the second-stage planetary mechanism; 12. Single-stage fixed-axis gear speed-increasing mechanism; 121. Head gear; 122. Idler gear; 123. Tail gear; 13. Gear pump; 14. Positioning pin;

[0033] 2. Idler gear;

[0034] 3. Fixed-axis gear; 31. Front groove; 32. Rear groove; 321. Internal spline;

[0035] 4. Spline shaft;

[0036] 5. Front bearing housing;

[0037] 6. End cover; 61. Front part of the end cover; 611. Outer cylindrical surface; 612. Rear end face; 613. First mounting hole; 614. Second mounting hole; 615. Third mounting hole; 62. Rear part of the end cover; 621. Internal gear;

[0038] 7. First-stage planetary mechanism; 71. Internal gear ring; 72. Hollow housing; 721. Annular boss; 722. Flange; 723. Positioning pin hole;

[0039] 8. Small end cover;

[0040] 9. Lifting oil cylinder;

[0041] 10. Fixed reduction gearbox housing; 101. Chamber. Detailed implementation manner

[0042] The present invention discloses a compact transmission connection structure for a cutting main body of a shearer, as Figure 1-8As shown in the figure, it includes a first-stage planetary mechanism 7 and a fixed-axis gear 3. The internal gear ring 71 of the first-stage planetary mechanism extends forward axially to form a cylindrical hollow housing 72, and the fixed-axis gear is installed in the cavity of the hollow housing. A circular boss 721 extending into the cavity is provided at one end of the hollow housing close to the first-stage planetary mechanism, and the rear end of the fixed-axis gear is rotatably supported on the circular boss by a bearing. The front end of the fixed-axis gear can be rotatably supported on the front bearing block 5 by a bearing, and the front bearing block is fixedly installed in the through hole at the front end of the hollow housing. A spline hole with an open rear end is provided at the rear of the fixed-axis gear. The input end and the output end of the first-stage planetary mechanism are the sun gear and the planet carrier respectively. A spline hole is provided at the center of the planet carrier. The spline holes on the fixed-axis gear and the planet carrier are simultaneously spline-connected to the front and rear splines of a spline shaft 4. The power output by the first-stage planetary mechanism through the planet carrier is transmitted to the fixed-axis gear through the spline shaft. An opening is provided on the side wall of the hollow housing to facilitate the external meshing of the fixed-axis gear with other gears, so as to continue the transmission of power. The first-stage planetary mechanism and the fixed-axis gear are both components of the cutting transmission system of the shearer.

[0043] Only the circular boss is provided between the fixed-axis gear and the first-stage planetary mechanism to support the bearing. The structure is simple and the axial space occupied is small, which can make the fixed-axis gear as close as possible to the first-stage planetary mechanism. Since the compact transmission connection structure of the cutting main body of the shearer is located in front of the conveyor when used on the shearer, and the first-stage planetary mechanism is relatively close to the support leg or the scraper of the shearer, the closer the fixed-axis gear is to the first-stage planetary mechanism, the more the center of gravity of the shearer shifts towards the gob side, and the closer it is to the support leg or the scraper, the more beneficial it is to the support stability of the shearer. Since the first-stage planetary mechanism and the fixed-axis gear are relatively large-sized and heavy parts in the cutting transmission system, the greater the power of the shearer, the more obvious the improvement effect of the above structure on the center of gravity of the shearer.

[0044] The hollow housing and the internal gear ring of the first-stage planetary mechanism are the front and rear parts of a single part, and it is easier to ensure the position accuracy between the installation bases of multiple other parts thereon.

[0045] Furthermore, a flange 722 is provided at the front end of the hollow housing, and a plurality of positioning pin holes 723 and screw holes are provided on the flange. The hollow housing is connected and installed on other structural members by using the flange. Setting the flange at the front end instead of the rear end can avoid occupying the connection and installation space at the rear end. On the one hand, it can make the fixed-axis gear and the first-stage planetary mechanism closer to the support leg (or scraper) of the shearer, which is beneficial to the shift of the center of gravity of the shearer towards the gob side. On the other hand, it is beneficial to maintain a sufficient safety distance between the first-stage planetary mechanism and the front beam of the support during the cooperation of the three machines.

[0046] The compact drive connection structure of the shearer cutting main body further includes a fixed reduction gearbox housing 10, and the hollow housing is fixedly installed in the fixed reduction gearbox housing. The hollow housing and the internal gear ring of the first-stage planetary mechanism are radially positioned through the clearance fit between their outer cylindrical surfaces and the corresponding mounting holes of the fixed reduction gearbox housing. The hollow housing is axially positioned by the flange, and the circumferential positioning between the flange and the fixed reduction gearbox housing is achieved through positioning pins. The positioning pins are installed in the paired positioning pin holes on the flange and the fixed reduction gearbox housing.

[0047] There may be three mounting holes, namely, a front mounting hole, a middle mounting hole, and a rear mounting hole, in the fixed reduction gearbox housing. The front end and the rear end of the hollow housing are in clearance fit with the front mounting hole and the middle mounting hole respectively, and the rear end of the internal gear ring of the first-stage planetary mechanism is in clearance fit with the rear mounting hole. A seal is provided between the mating surfaces at each clearance fit. The rear end of the hollow housing is axially opposite to the position of the annular boss. The three mounting holes may be respectively arranged on three adjacent partition walls in the fixed reduction gearbox housing, and a chamber may be defined between adjacent partition walls.

[0048] In the state of being installed on the shearer, the opening on the side wall of the hollow housing may face left or right. When the hollow housing belongs to the left cutting system, the opening faces left, and the fixed-axis gear is externally meshed with the gear located on its left. When the hollow housing belongs to the right cutting system, the opening faces right, and the fixed-axis gear is externally meshed with the gear located on its right.

[0049] The width (perpendicular to the axial direction) of the opening on the side wall of the hollow housing is preferably equal to the inner diameter of the hollow housing to facilitate the smooth disassembly and assembly of the larger-sized gear that is externally meshed with it. The inner walls above and below the opening are both flat and tangent to the right or left semi-cylindrical side wall of the hollow housing, and the three sides enclose a U-shaped opening facing left or right (see Figure 2 )

[0050] An idle gear 2 is also installed in the fixed reduction gearbox housing. The idle gear is externally meshed with the fixed-axis gear, and a part of the idle gear enters the cavity of the hollow housing through the opening on the side wall of the hollow housing. The idle gear is also a part of the cutting drive system.

[0051] The compact drive connection structure of the cutting main body of the shearer may further include a speed increasing drive system 1 for the pump. The speed increasing drive system for the pump can replace the traditional pump motor to provide power for the gear pump of the hydraulic system on the shearer, and includes a two-stage series planetary speed increasing mechanism 11 and a first-stage fixed-axis gear speed increasing mechanism 12 that are sequentially drive-connected. The power input end and the power output end of the two-stage series planetary speed increasing mechanism are respectively the planet carrier 111 of the first-stage planetary mechanism and the sun gear 115 of the second-stage planetary mechanism. The power input end and the power output end of the first-stage fixed-axis gear speed increasing mechanism are respectively the head gear 121 and the end gear 123. The front end of the fixed-axis gear is provided with two stepped grooves that are larger at the front and smaller at the rear. The internal gear ring 113 of the first-stage planetary mechanism is installed in the front groove 31. The internal gear ring of the first-stage planetary mechanism is located at the bottom of the groove and is fixed relative to the hollow housing. The rear end of the planet carrier 111 of the first-stage planetary mechanism is provided with an external spline, and the external spline is engaged with the internal spline 321 provided in the rear groove 32 to form a spline connection. When the fixed-axis gear rotates, the internal spline in the rear groove rotates synchronously, and the internal spline drives the planet carrier of the first-stage planetary mechanism to rotate, realizing the power input to the first-stage planetary mechanism. For the convenience of processing, a relief groove is further provided behind the internal gear in the rear groove.

[0052] The speed increasing drive system for the pump leads out a power output branch from the fixed-axis gear of the cutting drive system and transmits the corresponding power to the gear pump 13, so there is no need to separately equip an external power source for the gear pump.

[0053] The cutting drive system is a speed reducing drive system. Using the speed increasing drive system for the pump can re-increase the speed at a certain node after speed reduction, and finally increase the speed of the gear pump to the required speed to realize the normal working state of the gear pump. Using the two-stage series planetary speed increasing mechanism can achieve a larger speed ratio with a smaller space occupation, which is very beneficial to saving the installation space and making the system more compact.

[0054] The output end of the sun gear of the second-stage planetary mechanism is provided with an external spline, and the external gear is engaged with the internal spline provided in the core of the head gear to form a spline connection. The core of the end gear is provided with a gear pump drive shaft installation interface structure. The gear pump drive shaft installation interface structure includes an internal spline provided in the core of the output end of the end gear, which is used to form a spline connection with the external spline on the input end of the drive shaft of the gear pump. The speed increasing drive system for the pump uses spline connections in many places, which can further save the axial installation space.

[0055] Further, the speed increasing drive system for the pump further includes an end cover 6. The end cover is fixedly connected to the hollow housing from the front, and closes the front end of the fixed-axis gear within the hollow housing. The outer shape of the end cover is preferably in a stepped shape that is larger at the front and smaller at the rear. The front part 61 and the rear part 62 of the end cover are respectively provided with a front chamber with an open front and a rear chamber with an open rear, and the front and rear chambers communicate with each other. The rear part of the end cover is inserted into the front groove 31 of the fixed-axis gear, and is stacked and fixedly connected with the internal gear ring 113 of the first-stage planetary mechanism front and rear. The main body of the second-stage planetary mechanism is installed in the rear chamber of the end cover. The rear part of the end cover is provided with an internal gear 621. The rear part of the end cover serves as the internal gear ring of the second-stage planetary mechanism by means of this internal gear, which is equivalent to that the second-stage planetary mechanism is also arranged in the front groove of the fixed-axis gear, significantly saving the axial installation space. The first-stage fixed-axis gear speed increasing mechanism 12 is installed in the front chamber of the end cover. The output end of the sun gear 115 of the second-stage planetary mechanism extends forward through the communication part between the front and rear chambers and enters the core part of the head gear 121 and is spline-connected thereto.

[0056] Since the second-stage series planetary speed increasing mechanism is arranged in the groove of the fixed-axis gear and the first-stage fixed-axis gear speed increasing mechanism is arranged in the front chamber of the end cover, the installation space of the speed increasing drive system for the pump is further saved, especially reducing the axial space occupation. The speed increasing drive system for the pump realizes a compact arrangement. As Figure 3 shown, when the hydraulic system shares the chamber 101 with the height adjusting cylinder 9, this compact arrangement can ensure that there is enough installation space for the height adjusting cylinder in the front and rear directions. The compact arrangement also enables the speed increasing drive system for the pump to be applicable to shearers for thin or extremely thin coal seams.

[0057] Preferably, the rear part 62 of the end cover and the internal gear ring 113 of the first-stage planetary mechanism are positioned by a circular stop and a plurality of positioning pins 14, and are fixedly connected by screws.

[0058] The front part 61 of the end cover may be provided with an outward-turned edge structure. The outer cylindrical surface 611 of the front part of the end cover and the rear end surface 612 of the outward-turned edge structure are the positioning surfaces when the end cover is installed. The end cover is positioned and installed on the front bearing seat through its outward-turned edge structure. A seal is also provided between the cylindrical mating positioning surfaces between the end cover and the front bearing seat. The other surfaces of the end cover do not contact the fixed-axis gear.

[0059] An idle gear 122 is further provided between the head gear and the tail gear, and the idle gear is in external meshing with both the head gear and the tail gear. Correspondingly, there are a first mounting hole 613, a second mounting hole 614, and a third mounting hole 615 respectively. The head gear, the idle gear, and the tail gear are respectively located in the first, second, and third mounting holes. The idle gear is rotationally supported on an idle gear shaft through a bearing, and both ends of the idle gear shaft are fixedly installed on the end cover. When installing the gear pump, the gear pump will be located on the front end face of the end cover opposite to the third mounting hole. A small end cover 8 is further fixedly installed on the front end face of the end cover opposite to the first mounting hole, and the small end cover closes the first mounting hole from the front. In this embodiment, the small end cover also serves as the front bearing seat of the head gear.

[0060] In the embodiment shown in the attached drawings, the sun gear 112 of the first-stage planetary mechanism is spline-connected to the planet carrier 114 of the second-stage planetary mechanism. Specifically, an external spline is provided at the output end of the sun gear of the first-stage planetary mechanism, and the external spline is engaged with an internal spline provided in the core of the planet carrier of the second-stage planetary mechanism to form a spline connection.

[0061] In this article, the front and the rear respectively correspond to Figure 3 the up and down directions.

Claims

1. A compact drive connection structure for the cutting main body of a shearer, characterized in that: It includes a speed increasing drive system for a pump, a first-stage planetary mechanism, and a fixed-axis gear. The internal gear ring of the first-stage planetary mechanism extends axially forward to form a cylindrical hollow housing. The fixed-axis gear is installed in the cavity of the hollow housing. One end of the hollow housing close to the first-stage planetary mechanism is provided with a circular boss that projects into the cavity. The rear end of the fixed-axis gear is rotatably supported on the circular boss. The rear part of the fixed-axis gear is provided with a spline hole with an open rear end. The sun gear and the planet carrier of the first-stage planetary mechanism are its input end and output end respectively. A spline hole is provided at the center of the planet carrier. The spline hole on the fixed-axis gear and the spline hole on the planet carrier are simultaneously spline-connected to the front and rear splines of a spline shaft. An opening is provided on the side wall of the hollow housing. The speed increasing drive system for the pump includes a second-stage series planetary speed increasing mechanism and a first-stage fixed-axis gear speed increasing mechanism that are sequentially connected in transmission. The power input end and the power output end of the second-stage series planetary speed increasing mechanism are the planet carrier of the first-stage planetary mechanism and the sun gear of the second-stage planetary mechanism respectively. The power input end and the power output end of the first-stage fixed-axis gear speed increasing mechanism are the first gear and the last gear respectively. The front end of the fixed-axis gear is provided with two stepped grooves that are larger at the front and smaller at the rear. The internal gear ring of the first-stage planetary mechanism is installed in the front groove and is fixed relative to the hollow housing. The rear end of the planet carrier of the first-stage planetary mechanism is provided with an external spline, and this external spline is engaged with the internal spline provided in the rear groove to form a spline connection.

2. The compact drive connection structure of the cutting main body of the shearer according to claim 1, characterized in that: A flange is provided at the front end of the hollow housing, and a plurality of positioning pin holes are provided on the flange.

3. The compact drive connection structure of the cutting main body of the shearer according to claim 2, characterized in that: It further includes a fixed reduction gearbox housing. The hollow housing is fixedly installed in the fixed reduction gearbox housing. The hollow housing and the internal gear ring of the first-stage planetary mechanism achieve radial positioning through the clearance fit between their outer cylindrical surfaces and the corresponding installation holes of the fixed reduction gearbox housing. The hollow housing is axially positioned through the flange, and circumferential positioning is achieved through positioning pins between the flange and the fixed reduction gearbox housing.

4. The compact drive connection structure of the cutting main body of the shearer according to claim 3, wherein: There are three installation holes, namely a front hole, a middle hole, and a rear hole, in the fixed reduction gearbox housing. The front end and the rear end of the hollow housing are in clearance fit with the front hole and the middle hole respectively. The rear end of the internal gear ring of the first-stage planetary mechanism is in clearance fit with the rear hole, and a seal is provided between the mating surfaces at each clearance fit.

5. The compact drive connection structure of the cutting main body of the shearer according to claim 1, 2, 3 or 4, characterized in that: The opening on the side wall of the hollow housing faces left or right.

6. The compact drive connection structure of the cutting main body of the shearer according to claim 5, characterized in that: The width of the opening on the side wall of the hollow housing is equal to the inner diameter of the hollow housing. The upper inner wall and the lower inner wall of the opening are both flat and are tangent to the right or left semi-cylindrical side wall of the hollow housing, and the three sides enclose a U-shaped opening that faces left or right.

7. The compact drive connection structure of the cutting main body of the shearer according to claim 6, wherein: An idler gear is also installed in the fixed reduction gearbox housing. The idler gear is externally engaged with the fixed-axis gear, and a part of the idler gear enters the cavity of the hollow housing through the opening on the side wall of the hollow housing.

8. The compact drive connection structure of the cutting main body part of the shearer according to claim 1, 2, 3, 4, 5, 6 or 7, characterized in that: The speed increasing drive system for the pump further includes an end cover, which is fixedly connected to the hollow housing from the front. The outer shape of the end cover is a stepped shape with a larger front and a smaller rear. The front part and the rear part of the end cover are respectively provided with a front chamber with an open front and a rear chamber with an open rear. The front and rear chambers are communicated. The rear part of the end cover is inserted into the front groove of the fixed-axis gear and is stacked and fixedly connected with the internal gear ring of the first-stage planetary mechanism. The main body of the second-stage planetary mechanism is installed in the rear chamber of the end cover. The rear part of the end cover is provided with an internal gear, and the rear part of the end cover serves as the internal gear ring of the second-stage planetary mechanism by means of this internal gear. The first-stage fixed-axis gear speed increasing mechanism is installed in the front chamber of the end cover. The output end of the sun gear of the second-stage planetary mechanism extends forward into the core of the head gear and is spline-connected thereto.

9. The compact drive connection structure of the cutting main body of the shearer according to claim 8, wherein: An idle gear is further provided between the head gear and the tail gear. The idle gear is externally meshed with both the head gear and the tail gear. The front part of the end cover is provided with three parallel mounting holes, namely a first mounting hole, a second mounting hole, and a third mounting hole. The head gear, the idle gear, and the tail gear are respectively located in the first, second, and third mounting holes. A small end cover is fixedly installed on the front end face of the end cover, and the small end cover closes the first mounting hole from the front.

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