Cutting drive main body structure

Abstract

The present invention relates to a cutting transmission main body structure, including a fixed reduction box housing and an oil cylinder located in its inner cavity, a cutting motor and a front-stage cutting transmission mechanism, the front-stage cutting transmission mechanism includes a high-speed planetary mechanism, a central gear and left and right groups of gear reduction mechanisms connected in sequence, the gear reduction mechanism includes a first and a second fixed axis gear transmission mechanism connected by a spline, the first and the second fixed axis gear transmission mechanism are respectively extended from the middle of the fixed reduction box housing to the left and right sides according to the power transmission sequence, the second fixed axis gear transmission mechanism is located in front of the first fixed axis gear transmission mechanism, the oil cylinder is located in front of the second fixed axis gear transmission mechanism, and the rear end of the fixed reduction box housing is provided with a bridge structure installation interface. The present invention can take into account the problems of loading channel and downhole transportation, and the transmission mechanism is relatively simple, and the overall layout is conducive to the improvement of the center of gravity of the coal mining machine.

Description

Technical Field

[0001] The invention relates to a cutting transmission main body structure, which is suitable for a coal mining machine with a short body and a wide mining range. Background Art

[0002] In the mining of thin coal seam lower limit or extremely thin coal seam conditions, in order to improve the adaptability of the cutting swing rocker to the coal seam, the cutting transmission system is usually set to consist of two parts: a fixed part with power and a swing part that outputs power. On this basis, some designs, due to the structure of the roller side loading channel, set part of the transmission of the fixed part above the conveyor trough, which not only affects the coal passing space, but also the front and rear width of the fixed part is too large, and the transportation space down the mine is limited; some designs set the power and main deceleration part on the coal wall side in front of the conveyor trough (that is, between the left and right rollers). Although the mining height can be lower, the transmission is relatively complex, and the center of gravity of the fixed part and the swing part is relatively biased towards the coal wall, which has a certain adverse effect on the operation of the whole machine, especially under the conditions of the downward mining working face. Summary of the invention

[0003] The present invention aims to provide a cutting transmission main body structure, which can avoid the problem of difficult transportation down the mine while taking the loading channel into consideration, and can also improve the center of gravity arrangement of the entire coal mining machine.

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

[0005] A cutting transmission main body structure comprises a fixed reduction box, the fixed reduction box comprises a fixed reduction box housing and an oil cylinder, a cutting motor and a front-stage cutting transmission mechanism arranged in the fixed reduction box housing, the front-stage cutting transmission mechanism comprises a high-speed planetary mechanism, a central gear and left and right sets of gear reduction mechanisms which are sequentially connected in transmission, the output shaft of the cutting motor is connected to the power input end of the high-speed planetary mechanism, the gear reduction mechanism comprises a first fixed-axis gear transmission mechanism and a second fixed-axis gear transmission mechanism which are sequentially connected in transmission, the first and second fixed-axis gear transmission mechanisms are respectively extended from the middle part of the fixed reduction box housing to the left and right sides according to the power transmission sequence, the second fixed-axis gear transmission mechanism is located in front of the first fixed-axis gear transmission mechanism, the power output end of the first fixed-axis gear transmission mechanism is spline-connected with the power input end of the second fixed-axis gear transmission mechanism, the oil cylinder is located in front of the second fixed-axis gear transmission mechanism, and a bridge structure mounting interface is provided at the rear end of the fixed reduction box housing.

[0006] The first fixed-axis gear transmission mechanism includes a rear idler wheel and a rear gear that are externally meshed in sequence, and the second fixed-axis gear transmission mechanism includes a front gear, a front idler wheel and a front-stage final gear that are externally meshed in sequence. The cores of the front gear and the rear gear are both provided with internal splines, and the core of the rear gear is matched with the external splines of a spline sleeve. The internal splines on the front gear and the internal splines on the spline sleeve are respectively matched with the external splines at the front and rear ends of a double-headed spline shaft. There are one or more rear idler wheels. When there are multiple rear idler wheels, the rear idler wheels are externally meshed in sequence, and the number of rear idler wheels in the left and right groups of gear reduction mechanisms is the same or different.

[0007] A hydraulic system is also installed on the fixed reduction gearbox housing. The hydraulic system and the oil cylinder are located in the same chamber in the fixed reduction gearbox housing. The hydraulic system includes a gear pump and a first-stage planetary speed increasing mechanism and a first-stage fixed-axis gear speed increasing mechanism that are sequentially connected in transmission. The power input end of the first-stage planetary speed increasing mechanism is spline-connected to the front end of the front gear, and the terminal gear of the first-stage fixed-axis gear speed increasing mechanism is coaxially spline-connected to the transmission shaft of the gear pump.

[0008] The cutting transmission main body structure also includes a boom, the boom includes a boom housing and a rear-stage cutting transmission mechanism, the rear-stage cutting transmission mechanism includes a rear-stage first gear, a rear-stage idler gear and a rear-stage gear shaft that are externally meshed in sequence, the various parts of the rear-stage cutting transmission mechanism are extended left and right according to the power transmission order, there is one or more rear-stage idler gears, when there are multiple rear-stage idler gears, the rear-stage idler gears are externally meshed in sequence, the rear-stage first gear is installed in the transmission housing of 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, the front-stage final gear and the rear-stage first gear form a spline connection by means of a spline shaft, the boom housing is hinged to the fixed reduction box housing, and the hinge axis coincides with the center line of the spline connection, one end of the cylinder is hinged to the fixed reduction box housing, and the other end is hinged to the boom housing.

[0009] The boom housing may further include a front support arm and a rear support arm. The front support arm and the rear support arm are cantilever structures respectively connected to the transmission box body from the front and rear. The free ends of the front support arm and the rear support arm serve as a front hinge ear and a rear hinge ear respectively, and are hinged to a front hinge seat and a rear hinge seat on the fixed reduction gearbox housing. The front hinge seat is a double-ear hinge seat. An opening is provided on the side wall of the fixed reduction gearbox housing between the two connecting ears of the front hinge seat. An oil cylinder connecting ear is provided outside the front hinge ear. The oil cylinder connecting ear extends into the inner cavity of the fixed reduction gearbox housing through the opening. The oil cylinder is hinged to the boom housing through the oil cylinder connecting ear. The oil cylinder and the front-stage cutting transmission mechanism are located in different chambers respectively. The chamber where the oil cylinder is located is at the foremost side inside the fixed reduction gearbox housing. A side plate is installed on the front side of the fixed reduction gearbox housing. The chamber where the oil cylinder is located is surrounded by the side plate, the fixed reduction gearbox housing, the front hinge seat and the front hinge ear.

[0010] An upper plate and a lower plate extending outward toward the boom housing may be provided between the two connecting ears of the front hinge seat. The upper plate and the lower plate are both part of the fixed reduction gearbox housing. The outer ends of the upper plate and the lower plate are respectively set as an upper inner cylindrical surface and a lower inner cylindrical surface coaxial with the hinge axis of the front hinge seat. An upper outer cylindrical surface and a lower outer cylindrical surface coaxial with the hinge axis of the front hinge seat are provided outside the front hinge ear. The upper inner cylindrical surface and the upper outer cylindrical surface are in clearance fit, and the lower inner cylindrical surface and the lower outer cylindrical surface are in clearance fit. The circumferential angle formed by the upper inner cylindrical surface and the lower inner cylindrical surface on the side closer to the fixed reduction gearbox housing does not exceed 180 degrees.

[0011] The rear connecting ear of the front hinge seat just fits into the space between the front support arm and the transmission box body and keeps a gap with them. The front-stage final gear is installed in the rear connecting ear of the front hinge seat. An annular axial partition is provided in the inner hole of the rear connecting ear of the front hinge seat. The front-stage final gear is located behind the axial partition. The front pin shaft matching with the front hinge seat is located in front of the axial partition. A central through hole is provided in the front pin shaft. A spline sleeve with an internal spline and an external spline is installed in the front-stage spline hole. The internal spline of the spline sleeve and the rear-stage spline hole are spline-connected to the front and rear splines of the same spline shaft respectively. The internal spline of the spline sleeve is arranged in the inner hole of its rear section. The inner hole of the front section of the spline sleeve is a smooth hole. A positioning sleeve is installed in the central through hole. The rear end of the positioning sleeve is inserted into the smooth hole of the spline sleeve and axially limits the core part of the front end face of the spline shaft. An annular flange is provided in the middle of the positioning sleeve. The outer cylindrical surface of the annular flange is in clearance fit with both the central through hole and the inner hole of the axial partition, and a seal is provided between the mating surfaces. An end face seal is provided between the rear connecting ear of the front hinge seat and the rear-stage cutting transmission mechanism and / or the transmission box body.

[0012] The structure of the cutting transmission main body further includes a crossover structure. The installation interface of the crossover structure includes a horizontally forward concave and left - right extending positioning groove at the rear end of the fixed reduction gearbox housing, and left and right grooves on the left and right sides of the positioning groove. Pin holes penetrating the fixed reduction gearbox housing vertically are respectively provided in the left and right grooves. On the front end face of the crossover structure, there are a horizontally forward convex and left - right extending upper positioning boss and lower positioning boss, and left and right connecting ears extending horizontally forward on the left and right sides of the upper and lower positioning bosses. The upper plane of the upper positioning boss and the lower plane of the lower positioning boss respectively form positioning mating surfaces with the upper and lower groove walls of the positioning groove. The left and right connecting ears are respectively inserted into the left and right grooves. The ear hole of the left connecting ear and the pin hole of the left groove are simultaneously matched with the left positioning pin shaft hole, and the ear hole of the right connecting ear and the pin hole of the right groove are simultaneously matched with the right positioning pin shaft hole.

[0013] The crossover structure may include an intermediate box body, and a left connecting block and a right connecting block detachably fixed to the left and right sides of the intermediate box body respectively. The upper positioning boss and the lower positioning boss are located on the intermediate box body, and the left and right connecting ears are respectively located on the left and right connecting blocks. The rear bottom surface of the intermediate box body is set as a horizontal plane, the middle bottom surface is set as a horizontal plane or an arched curved surface, and the thickness of the rear part of the intermediate box body in the up - down direction is less than that of the front part.

[0014] The cutting motor is a 6 - pole or 8 - pole motor.

[0015] The beneficial effects of the present invention are as follows:

[0016] When the three machines are coordinated, the crossover structure is located above the conveyor, and the fixed reduction gearbox and the boom are both located on the front side of the conveyor and between the left and right drums, which can adapt to low mining heights, reduce the height of the fuselage, and consider the loading passage. Since the crossover structure and the fixed reduction gearbox are detachably and fixedly connected, the problem of limited space during underground transportation is solved.

[0017] Since there are relatively heavy components such as planetary mechanisms in the front - stage cutting transmission mechanism, compared with which the oil cylinder occupies a large space but is light in weight, arranging the cavity occupied by the oil cylinder in front of the front - stage cutting transmission mechanism can shift the overall center of gravity of the shearer towards the goaf side, making the center of gravity of the shearer closer to the position of the support leg (or scraper plate) than that of the existing - structure shearer, and improving the stability of the shearer in both the stationary state and the walking state.

[0018] The upper positioning boss and the lower positioning boss form a flat stop - notch positioning in the up - down direction with the positioning groove. When positioning and connecting, the support surface is relatively long and the stress condition is good. Coupled with the pin shaft positioning on the left and right sides, a reliable connection between the fixed reduction gearbox and the crossover structure can be achieved.

[0019] The bridging structure adopts a split structure in which the left connecting block, the middle box body, and the right connecting block are detachably connected to each other from left to right. The upper positioning boss and the lower positioning boss are arranged on the middle box body, and the left and right connecting ears are arranged on the left and right connecting blocks. When a connecting ear on one side is damaged, only the connecting block on the corresponding side needs to be replaced, and the middle box body can still work reliably without being scrapped due to the damage of any connecting ear on one side. Therefore, the service life is relatively long and the maintenance cost is significantly reduced. When a wider conveyor needs to be matched, the left and right connecting blocks and the corresponding connecting parts can also be replaced only to achieve a longer production cycle.

[0020] The rear bottom surface of the middle box body is set as a horizontal plane, and the whole rear part is flat, that is, the thickness in the up and down direction is relatively small, at least much smaller than the front part, so that even when matching a wider conveyor, it will not affect the coal passing space. And the middle bottom surface of the middle box body can still be set as an arched curved surface to increase the coal passing space.

[0021] The front-stage cutting transmission mechanism transmits power to the rear-stage cutting transmission mechanism through a spline connection structure with three places and two levels, increasing the radial floating amount. And because the relevant parts forming the spline connection structure can be automatically centered, the radial offset caused by the wear of the rotating support surfaces at both ends of the transmission parts in the axial direction has less influence on the transmission meshing. Or rather, the adaptability of the transmission structure between the front-stage and rear-stage cutting transmission mechanisms to the wear of the rotating support surfaces at both ends in the axial direction is improved. Therefore, the reliability of the power transmission between the rocker arm and the fixed reduction gearbox can be significantly improved.

[0022] Since the front-stage cutting transmission mechanism adopts a high-speed planetary mechanism and a 6-pole or 8-pole motor, the front-stage cutting transmission mechanism can be made simpler and contribute to its miniaturization.

[0023] By leading out a power output branch from the front gear in the front-stage cutting transmission mechanism and transmitting it to the gear pump of the hydraulic system through a first-stage planetary speed-increasing mechanism and a first-stage fixed-axis gear speed-increasing mechanism, the gear pump does not need to be equipped with a separate pump motor, saving costs. And the adoption of a first-stage planetary speed-increasing mechanism and a first-stage fixed-axis gear speed-increasing mechanism not only finally increases the speed of the gear pump to the required speed to ensure the normal operation of the gear pump, but also realizes a large speed ratio with a small space occupation, saving installation space, and achieving a reasonable match with the front-stage cutting transmission mechanism adopting a multi-pole motor and a high-speed planetary mechanism.

[0024] A relatively closed chamber is formed by the side plate, the fixed reduction gearbox housing, the front hinge seat, and the front hinge ear. And at the mouth where the front hinge ear is inserted into the fixed reduction gearbox housing, two cylindrical surface clearance fits are set up and down. While not affecting the swing of the boom housing, the chamber where the oil cylinder is located is better sealed, so as to effectively isolate foreign matters such as pulverized coal, thus ensuring that the chamber where the oil cylinder is located always maintains a good working environment and improving the reliability of the oil cylinder operation.

[0025] By setting different numbers of rear idler pulleys, boom arms of different length specifications can be obtained. When the left and right symmetric fixed reduction gearbox housings are installed with left and right boom arms of different specifications, different output rotations of the left and right drums can be achieved. By setting different numbers of rear idler pulleys, the fixed reduction gearbox can achieve a left-right asymmetric structure. After connecting the left and right of this structure to boom arms of the same length specification, different output rotations of the left and right drums can also be achieved.

[0026] Install the front-stage final gear in the rear connecting ear of the front hinge seat, and conduct internal space functional zoning by setting an axial partition to simplify and compact the structure at the connection between the boom arm housing and the fixed reduction gearbox housing as much as possible. By setting the front pin shaft to a hollow structure, on the one hand, it provides sufficient disassembly and assembly space for the spline shaft, and this disassembly and assembly space is located on the side of the drum, without occupying the coal passing channel and not affecting coal passing; on the other hand, when the shearer boom is in normal use, the disassembly and assembly space can be used to install a positioning structure to axially limit the spline shaft, achieving multiple functions with one action. Brief Description of the Drawings

[0027] Figure 1 The top view of the first embodiment of the present invention;

[0028] Figure 2 The left view of the second embodiment of the present invention;

[0029] Figure 3 is Figure 1 the A-A cross-sectional view of;

[0030] Figure 4 is Figure 1 the B-B cross-sectional view of;

[0031] Figure 5 is Figure 1 the schematic structural view of the boom arm described in;

[0032] Figure 6 is Figure 1 the C-C cross-sectional view of;

[0033] Figure 7 The top view of an embodiment of the fixed reduction gearbox;

[0034] Figure 8 The top view of the second embodiment of the fixed reduction gearbox;

[0035] Figure 9 The specific schematic structural view of the connection between the front and rear stage cutting drive mechanisms;

[0036] Figure 10 The schematic structural view of an embodiment of the hydraulic system.

[0037] Reference numerals:

[0038] 1. Boom; 11. Boom housing; 111. Transmission box body; 112. Front support arm; 1122. Cylinder connection ear; 1123. Upper outer cylindrical surface; 1124. Lower outer cylindrical surface; 113. Rear support arm;

[0039] 2. Fixed reduction gearbox; 21. Fixed reduction gearbox housing; 211. Front hinge seat; 2111. Front connection ear of the front hinge seat; 2112. Rear connection ear of the front hinge seat; 2113. Upper inner cylindrical surface; 2114. Lower inner cylindrical surface; 212. Rear hinge seat; 213. Axial partition; 214. Upper plate; 215. Lower plate; 216. Positioning groove; 2161. Upper groove wall; 2162. Lower groove wall; 22. Front pin shaft; 23. Rear pin shaft; 26. Positioning sleeve; 27. Sealing ring; 28. Sealing ring; 29. Side plate;

[0040] 3. Hydraulic system; 31. Gear pump; 32. First-stage planetary speed increasing mechanism; 33. First-stage fixed-axis gear speed increasing mechanism;

[0041] 4. Cylinder;

[0042] 51. Spline shaft; 52. Spline sleeve;

[0043] 6. Cross-bridge structure; 61. Upper positioning boss; 62. Lower positioning boss; 63. Left connection ear; 65. Left positioning pin; 66. Right positioning pin.

[0044] 7. Cutting motor;

[0045] 81. High-speed stage planetary mechanism; 82. Front-stage final gear; 83. Central gear; 84. Rear idler gear; 85. Rear gear; 86. Spline sleeve; 87. Double-headed spline shaft; 88. Front gear; 89. Front idler gear;

[0046] 91. Rear-stage first gear; 92. Rear-stage idler gear; 93. Rear-stage gear shaft. Detailed implementation manners

[0047] The present invention discloses a structure of a cutting transmission main body part, as Figures 1-10As shown, it includes a fixed reduction box 2, which includes a fixed reduction box housing 21 and an oil cylinder 4, a cutting motor 7 and a front-stage cutting transmission mechanism arranged in the fixed reduction box housing. The front-stage cutting transmission mechanism includes a high-speed planetary mechanism 81, a central gear 83 and two left and right gear reduction mechanisms that are sequentially connected. The central gear and the left and right gear reduction mechanisms form a multi-stage large reduction ratio transmission mechanism. The cutting motor 7 and the high-speed planetary mechanism 81 each have one, and the output shaft of the cutting motor extends backward and is coaxially connected to the power input end of the high-speed planetary mechanism. The central gear is meshed with the left and right gear reduction mechanisms at the same time. The gear reduction mechanism includes a first fixed-axis gear transmission mechanism and a second fixed-axis gear transmission mechanism that are sequentially connected. The first and second fixed-axis gear transmission mechanisms are each extended from the middle of the fixed reduction box housing to the left and right sides according to the power transmission sequence. The second fixed-axis gear transmission mechanism is located in front of the first fixed-axis gear transmission mechanism, and the power output end of the first fixed-axis gear transmission mechanism is spline-connected with the power input end of the second fixed-axis gear transmission mechanism. A cutting motor is used to drive the left and right gear reduction mechanisms, and transmit power to the left and right booms respectively, which can fully utilize the cutting power, improve the use efficiency, and reduce the idling transmission motion loss.

[0048] The oil cylinder is located in front of the second fixed axis gear transmission mechanism. By arranging the oil cylinder, which occupies a large space but is significantly lighter than the front-stage cutting transmission mechanism, in front of the front-stage cutting transmission mechanism, the front-stage cutting transmission mechanism can be placed as close to the support leg (or conveyor shovel) as possible, so that the overall center of gravity of the coal mining machine is offset to the goaf side compared with the existing structure, and the stability of the coal mining machine in both the stationary state and the walking state is improved.

[0049] The rear end of the fixed reduction box housing is provided with a bridge structure installation interface so that the fixed reduction box housing can be arranged front and rear with the bridge structure and can be detachably fixedly connected to each other. When the three machines are coordinated, since the bridge structure is located above the conveyor, the fixed reduction box is located at the front side of the conveyor and between the left and right rollers, which can adapt to low mining heights, and the fixed reduction box housing is located at the front side of the conveyor trough as a whole, does not occupy the coal passing space above the conveyor trough, and is more convenient for transportation due to its narrow front and rear width.

[0050] The first fixed-axis gear transmission mechanism may include a rear idler wheel 84 and a rear gear 85, both of which have axes extending forward and backward and meshing with each other in sequence, and the second fixed-axis gear transmission mechanism may include a front gear 88, a front idler wheel 89 and a front-stage final gear 82, both of which have axes extending forward and backward and meshing with each other in sequence. The front-stage final gear is the output end of the front-stage cutting transmission mechanism, and the front-stage final gear is installed in the fixed reduction box housing through a bearing rotation support. The cores of the front gear and the rear gear are both provided with internal splines, and the core of the rear gear is provided with a spline sleeve 86, and the internal splines of the core of the rear gear cooperate with the external splines of the spline sleeve to form a spline connection, and the internal splines on the front gear and the internal splines on the spline sleeve respectively cooperate with the external splines at the front and rear ends of a double-headed spline shaft 87 to form a spline connection, thereby realizing the transmission of power from the first fixed-axis gear transmission mechanism to the second fixed-axis gear transmission mechanism.

[0051] There may be one or more rear idler wheels. When there are multiple rear idler wheels, the rear idler wheels are meshed with each other in sequence. The number of rear idler wheels in the left and right gear reduction mechanisms may be the same or different. In the same fixed reduction box housing, when the number of rear idler wheels in the left and right gear reduction mechanisms is different, the left and right lengths of the left and right halves of the fixed reduction box housing are different at the cutting motor boundary, and the fixed reduction box housing is asymmetrical (see Figure 8 ). When the number of rear idler wheels in the left and right gear reduction mechanisms is an odd number and the other is an even number, the left and right arm racks with the same specifications and length can make the left and right rollers turn in different directions.

[0052] The cutting motor is preferably a 6-pole or 8-pole motor. Using a motor with more poles can make the front-stage cutting transmission mechanism simpler and more compact.

[0053] The fixed reduction gearbox housing is also provided with a hydraulic system 3, which is located in the same chamber as the oil cylinder in the fixed reduction gearbox housing. Figure 10 As shown, the hydraulic system may include a gear pump 31 and a first-stage planetary speed increasing mechanism 32 and a first-stage fixed-axis gear speed increasing mechanism 33 which are sequentially connected in transmission, the power input end of the first-stage planetary speed increasing mechanism is spline-connected to the front end of the front gear, and the end gear of the first-stage fixed-axis gear speed increasing mechanism is coaxially spline-connected to the transmission shaft of the gear pump. Since a power output branch is drawn from the front-stage cutting transmission mechanism with the front gear as a node, the power is transmitted to the gear pump 31 through the first-stage planetary speed increasing mechanism and the first-stage fixed-axis gear speed increasing mechanism, so the gear pump does not need to be equipped with a separate pump motor.

[0054] The front-stage cutting drive mechanism is a speed reduction drive system. It uses a first-stage planetary speed increasing mechanism and a first-stage fixed-axis gear speed increasing mechanism to increase the speed of a certain node after speed reduction, and finally increases the speed of the gear pump to the required speed to achieve the normal working state of the gear pump. The use of the first-stage planetary speed increasing mechanism can achieve a large speed ratio with a small space occupation, which is not only beneficial to saving installation space but also easier to achieve matching with the front-stage cutting drive mechanism using a multi-pole motor.

[0055] The structure of the cutting drive main body further includes a boom 1. The boom includes a boom housing 11 and a rear-stage cutting drive mechanism. The rear-stage cutting drive mechanism can adopt a first-stage fixed-axis gear drive mechanism with a small speed reduction ratio, including a rear-stage first gear 91, a rear-stage idler gear 92, and a rear-stage gear shaft 93 whose axes all extend forward and backward and are externally meshed in sequence. Each part of the rear-stage cutting drive mechanism is arranged to extend left and right according to the power transmission sequence. There can be one or more rear-stage idler gears. When there are multiple rear-stage idler gears, the rear-stage idler gears are externally meshed with each other in sequence. When the number of rear-stage idler gears in the left and right booms is different, the lengths of the two boom housings are also different. The more the number of rear-stage idler gears, the longer the boom housing. When the number of rear-stage idler gears in the left and right booms is one odd and one even, for the input power in the same direction, the output power directions are opposite. When the number of rear idler gears in the left and right two sets of gear reduction mechanisms is both odd or both even, the booms with an odd number of rear-stage idler gears and an even number of rear-stage idler gears respectively on the left and right can also make the rotation directions of the left and right drums different. Therefore, various quantity combinations of rear idler gears and rear-stage idler gears can be used to achieve the same or opposite output rotation directions of the left and right drums of the double-drum shearer.

[0056] The rear-stage idler gear can be rotatably supported on the rear-stage idler gear shaft through a bearing, and the rear-stage idler gear shaft is fixedly installed in the transmission box body 111. The rear-stage first gear is installed in the transmission box body 111 of the boom housing. The cores of the front-stage last gear and the rear-stage first gear are respectively provided with a front-stage spline hole and a rear-stage spline hole. The front-stage last gear and the rear-stage first gear can be spline-connected by means of a spline shaft 51 to realize the transmission of power from the front-stage last gear to the rear-stage first gear. The relevant parts of the spline connection structure can be automatically centered. Therefore, the radial offset caused by the wear of the rotation support surfaces at both ends of the transmission parts axially has little influence on the transmission meshing. Therefore, the reliability of the power transmission between the boom and the fixed reduction gearbox can be significantly improved. The boom housing is hinged to the fixed reduction gearbox housing, and the hinge axis coincides with the center line of the spline connection.

[0057] One end of the oil cylinder is hinged to the fixed reduction gearbox housing, and the other end is hinged to one end of the boom housing close to the rear-stage first gear. The boom housing is driven to make a fixed-axis swing by the telescopic movement of the oil cylinder.

[0058] The transmission housing may be L-shaped, including left and right extension sections and front and rear extension sections. Accordingly, the rear-stage first gear may be rotatably supported and installed inside the free ends of the left and right extension sections of the transmission housing via bearings.

[0059] The free ends of the front and rear extensions of the transmission case can be cylindrical, and the rear gear shaft is installed on the front and rear extensions of the transmission case, and its terminal end extends forward and outward to expose the free ends of the front and rear extensions. The terminal end of the rear gear shaft is provided with a roller positioning and mounting structure for mounting the roller. When the roller is installed, the roller is sleeved on the front and rear extensions of the transmission case, and the front part of the roller is coaxially connected to the rear gear shaft through the roller positioning and mounting structure. The connection structure is simple and can be matched with rollers of very small diameters, so it can adapt to the mining of low-mining coal seams and is more convenient for maintenance.

[0060] like Figure 5 As shown, the arm housing 11 may also include a front support arm 112 and a rear support arm 113, which are cantilever structures connected to the transmission housing from the front and rear, respectively. The free ends of the front support arm and the rear support arm are respectively hinged to the front hinge seat 211 and the rear hinge seat 212 on the fixed reduction box housing as the front hinge ear and the rear hinge ear, and the two hinges are respectively penetrated by the front pin 22 and the rear pin 23. The top surface of the front support arm and the rear support arm is preferably not higher than the top surface of the left and right extension sections of the transmission housing, and the bottom surface of the front support arm and the rear support arm is preferably not lower than the bottom surface of the left and right extension sections of the transmission housing, that is, the upper and lower thicknesses of the front support arm and the rear support arm are both smaller than the transmission housing, which can avoid the interference of the front support arm and the rear support arm with the top coal platform when the arm housing is in the upper cutting limit position, so that the mining height can be higher. For the mining of extremely thin or thin coal seams, the arm can meet both the lower mining limit and the higher mining limit, thus forming a wider mining range and being applicable to short-body coal mining machines. In this embodiment, the front support arm, the rear support arm and the transmission box are an integrated structure.

[0061] Since the support connection points formed between the boom housing and the fixed reduction box housing are located in front of and behind the power transmission connection points of the front and rear cutting transmission mechanisms, respectively, the radial displacement caused by wear at the front and rear support connection points has less impact on the power transmission connection point between the two, so the support connection structure can provide a more reliable guarantee for the transmission of cutting power. On the other hand, the average force point of the drum is located between the front and rear support connection points, and the force state of the boom housing is better.

[0062] Both the front hinge seat and the rear hinge seat are double-ear hinge seats. An opening is provided on the side wall of the fixed speed reducer housing between the two connecting ears of the front hinge seat. An oil cylinder connecting ear 1122 is provided outside the front hinge ear (i.e., the free end of the front support arm). The oil cylinder connecting ear extends into the inner cavity of the fixed speed reducer housing through the opening. The oil cylinder 4 is hinged to the boom housing through the oil cylinder connecting ear. Since the oil cylinder connecting ear is relatively close to the hinge axis between the boom housing and the fixed speed reducer housing, the force arm for driving the boom housing to swing is shorter. Correspondingly, the swing angle range of the boom housing is larger, which means the cutting height range that can be achieved is wider. The oil cylinder and the front-stage cutting transmission mechanism are located in different chambers respectively, and the chamber where the oil cylinder is located is at the frontmost side inside the fixed speed reducer housing. A side plate 29 is installed on the front side of the fixed speed reducer housing. The chamber where the oil cylinder is located is surrounded by the side plate, the fixed speed reducer housing, the front hinge seat, and the front hinge ear. Placing the oil cylinder in an independent chamber can provide a good working environment for the swing of the oil cylinder and improve the reliability of the oil cylinder operation. Since the chamber where the oil cylinder is located is an empty cavity and is arranged at the frontmost side inside the fixed speed reducer housing, it vacates a more rearward installation space for other structures, which is beneficial to the shift of the center of gravity of the shearer towards the support legs or the conveyor scraper, improving the stability of the shearer.

[0063] Preferably, an upper plate 214 and a lower plate 215 extending towards the outside of the boom housing are provided between the two connecting ears of the front hinge seat (see Figure 6 ). Both the upper plate and the lower plate are part of the fixed speed reducer housing. For example, they can be the continuous extension of the local top plate and bottom plate of the fixed speed reducer housing. The upper plate, the lower plate, and the two connecting ears of the front hinge seat enclose a space opening from four directions: up, down, front, and back. Compared with a simple planar opening, with the above-mentioned space opening and in cooperation with the front hinge ear, the channel for the chamber where the oil cylinder is located to communicate with the outside is narrower and smaller, which is more conducive to maintaining a good working environment in the chamber where the oil cylinder is located. The left and right directions of the outward extension of the upper plate and the lower plate should preferably be controlled not to exceed the center of the front hinge seat at the farthest. For the space opening, the upper plate and the lower plate can be further set to have a tapered constriction structure at the outward extending ends to minimize the entry of pulverized coal and the like into the oil cylinder installation chamber. When there is a space opening, it is equivalent to a certain degree of outward expansion of the space range of the oil cylinder installation chamber. Therefore, a part of the outer end of the front hinge ear is usually also inside the chamber where the oil cylinder is located.

[0064] Furthermore, the outer ends of the upper plate and the lower plate can be respectively arranged as an upper inner cylindrical surface 2113 and a lower inner cylindrical surface 2114 coaxial with the hinge axis of the front hinge seat. The outer part of the front hinge ear is provided with an upper outer cylindrical surface 1123 and a lower outer cylindrical surface 1124 coaxial with the hinge axis of the front hinge seat. The upper inner cylindrical surface and the upper outer cylindrical surface are in clearance fit, and the lower inner cylindrical surface and the lower outer cylindrical surface are in clearance fit. These two clearance fits not only do not affect the swing of the boom housing but also make the only channel communicating with the outside of the chamber where the oil cylinder is located relatively closed, which can better isolate foreign matters such as pulverized coal, so as to ensure that a good working environment is always maintained in the chamber where the oil cylinder is located. The upper inner cylindrical surface, the lower inner cylindrical surface, the upper outer cylindrical surface and the lower outer cylindrical surface are all non-circular cylindrical surfaces, but the central angles corresponding to the upper outer cylindrical surface and the lower outer cylindrical surface are much larger than the central angles corresponding to the upper inner cylindrical surface and the lower inner cylindrical surface, so as to ensure that the above two clearance fits are always effective during the swing of the boom housing and keep the oil cylinder installation chamber always clean. The circumferential angle formed by the upper inner cylindrical surface and the lower inner cylindrical surface closer to the fixed reduction gear housing side does not exceed 180 degrees to ensure the smooth connection and installation between the front hinge ear and the front hinge seat. In the chamber where the oil cylinder is located, the upper outer cylindrical surface and the lower outer cylindrical surface are separated by the oil cylinder connecting ear.

[0065] Furthermore, the rear connecting ear 2112 of the front hinge seat just fits into the space between the front support arm and the transmission box body and keeps a clearance with the front support arm and the transmission box body to ensure relative swing with the boom housing. As Figure 9As shown, the front-stage final gear is installed in the rear connecting ear of the front hinge seat. An annular axial partition 213 is provided in the inner hole of the rear connecting ear of the front hinge seat. The front-stage final gear is located behind the axial partition, and the front pin shaft that mates with the front hinge seat is located in front of the axial partition. In this embodiment, the axial partition is a part of the entity of the rear connecting ear of the front hinge seat and is a circular ring structure protruding radially towards the center of the ear hole, used for functionally partitioning the internal space of the rear connecting ear of the front hinge seat. A central through hole is provided in the front pin shaft. A spline sleeve 52 with internal and external splines is installed in the front spline hole. The internal spline of the spline sleeve and the rear-stage spline hole are spline-connected to the front and rear splines of the same spline shaft 51. A first-stage spline drive is formed between the front-stage final gear and the spline sleeve, and a second-stage spline drive is formed between the spline sleeve and the spline shaft, and between the spline shaft and the rear-stage first gear. Due to the adoption of spline connection structures with backlash fits in multiple places, the radial floating amount increases, and the adaptability of the transmission structure between the front and rear-stage cutting transmission mechanisms to the wear of the rotating support surfaces at the front and rear hinge seats is improved. The internal spline of the spline sleeve is provided in the inner hole of its rear section, and the inner hole of the front section of the spline sleeve is a smooth hole. A positioning sleeve 26 is installed in the central through hole. The positioning sleeve is cup-shaped, and the rear end is a sealed end. The rear end of the positioning sleeve passes through the axial partition and is inserted into the smooth hole of the spline sleeve, and axially limits the core part of the front end face of the spline shaft 51. In this embodiment, a wear-resistant pad is fixed to the rear end of the positioning sleeve, and the positioning sleeve axially limits the spline shaft by means of the wear-resistant pad. The spline shaft contacts the wear-resistant pad and rotates relative to the wear-resistant pad. The positioning sleeve is axially limited in the central through hole by a front end cover fixed on the front connecting ear 2111 of the front hinge seat. The positioning sleeve does not contact the spline sleeve. An annular flange is provided in the middle of the positioning sleeve. The outer cylindrical surface of the annular flange is simultaneously in clearance fit with the central through hole and the inner hole of the axial partition, and a seal is provided between the mating surfaces. In this embodiment, a seal groove is provided on the outer cylindrical surface of the annular flange, and a sealing ring 27 is installed therein. Through this sealing ring, the sealing between the positioning sleeve and the front pin shaft and the rear connecting ear of the front hinge seat is realized, preventing impurities such as water and pulverized coal from entering the spline connection structure from the front end. An end face seal is provided between the rear connecting ear 2112 of the front hinge seat and the left and right extension sections of the rear-stage cutting transmission mechanism and / or the transmission box body (for example, a seal groove is provided on the front end face of the transmission box body and a sealing ring 28 is installed), preventing impurities such as water and pulverized coal from entering the spline connection structure from the rear end.

[0066] The seal between the annular flange, the central through hole and the axial partition, as well as the aforementioned end face seal, can ensure the cleanliness and original lubrication of the spline connection structure, thereby extending the service life of the spline connection structure. When the spline shaft 51 is worn, as long as the positioning sleeve 26 is first removed from the front side to vacate the cylindrical space in front of the spline shaft 51, the spline shaft can be disassembled and assembled smoothly, and the spline shaft can be replaced. Moreover, this cylindrical space is located on the side of the drum and does not occupy the space above the coal conveying channel of the conveying trough, so it does not affect coal conveyance and mining either.

[0067] Furthermore, the cutting transmission main body structure may further include a cross-bridge structure 6. As Figure 1 、 3 shown in Figure 4, the installation interface of the cross-bridge structure includes a horizontally forward concave and left-right extending positioning groove 216 located at the rear end of the fixed reduction gearbox housing, and left and right grooves located on the left and right sides of the positioning groove. Pin holes penetrating the fixed reduction gearbox housing up and down are respectively provided in the left and right grooves. On the front end face of the cross-bridge structure, there are a horizontally forward convex and left-right extending upper positioning boss 61 and a lower positioning boss 62, and left and right connecting ears 63 and 64 that horizontally protrude forward and are located on the left and right sides of the upper and lower positioning bosses. The upper plane of the upper positioning boss and the lower plane of the lower positioning boss respectively form positioning mating surfaces with the upper groove wall 2161 and the lower groove wall 2162 of the positioning groove. The left and right connecting ears are respectively inserted into the left and right grooves. The ear hole of the left connecting ear and the pin hole of the left groove are simultaneously in shaft hole fit with the left positioning pin 65, and the ear hole of the right connecting ear and the pin hole of the right groove are simultaneously in shaft hole fit with the right positioning pin 66. The upper positioning boss, the lower positioning boss and the positioning groove form a flat stop opening positioning in the up and down direction. The supporting surface is relatively long during positioning connection, and the stress condition is good. Coupled with the pin shaft positioning on the left and right sides, a reliable connection between the fixed reduction gearbox and the cross-bridge structure can be achieved.

[0068] Preferably, part or all of the top surface of the cross-bridge structure is set as an inclined surface with the front end higher than the rear end. When the three machines are coordinated, it can maintain a sufficient gap between the body of the shearer and the top beam of the support, thereby meeting the mining requirements such as undulating roof and floor, coal gangue, etc., and ensuring the smooth mining of extremely thin or thin coal seams under complex conditions such as coal and rock.

[0069] It should be noted that there is a small error in the original text. In the description of the right connecting ear in the original text, it is written as "right connecting ear 64" which is not mentioned before. It should be "right connecting ear 63" to be consistent with the context. The above translation has been corrected accordingly.The bridging structure may include an intermediate box body, a left connecting block and a right connecting block that are detachably fixed to the left and right sides of the intermediate box body respectively. An upper positioning boss and a lower positioning boss are located on the intermediate box body, and a left connecting ear and a right connecting ear are located on the left connecting block and the right connecting block respectively. When a connecting ear on one side is damaged, only the connecting block on the corresponding side needs to be replaced, and the intermediate box body can still work reliably without being scrapped due to the damage of any one connecting ear. Therefore, the service life is relatively long and the maintenance cost is significantly reduced. The rear bottom surface of the intermediate box body is set as a horizontal plane, and the rear part is integrally flat, that is, the thickness in the up and down direction is small, at least much smaller than that of the front part. Therefore, even when matching a wider conveyor, it will not affect the coal passing space. When it is necessary to match a wider conveyor, keeping the intermediate box body unchanged and only replacing the left and right connecting blocks and the corresponding connecting parts can achieve a longer production cycle. In addition, the middle bottom surface of the intermediate box body can be set as a plane or an arched curved surface. When it is set as an arched curved surface, the coal passing space can be increased.

[0070] The front-back direction in this article respectively corresponds to Figure 1 the up-down direction.

Claims

1. A cutting transmission main body structure, characterized in that: It includes a fixed reduction box and a boom, the fixed reduction box includes a fixed reduction box housing and an oil cylinder, a cutting motor and a front-stage cutting transmission mechanism arranged in the fixed reduction box housing, the front-stage cutting transmission mechanism includes a high-speed planetary mechanism, a central gear and left and right sets of gear reduction mechanisms that are sequentially connected in transmission, the output shaft of the cutting motor is connected to the power input end of the high-speed planetary mechanism, the gear reduction mechanism includes a first fixed-axis gear transmission mechanism and a second fixed-axis gear transmission mechanism that are sequentially connected in transmission, the first and second fixed-axis gear transmission mechanisms are respectively extended from the middle part of the fixed reduction box housing to the left and right sides according to the power transmission sequence, the second fixed-axis gear transmission mechanism is located in front of the first fixed-axis gear transmission mechanism, and the power output end of the first fixed-axis gear transmission mechanism is connected to the second fixed-axis gear transmission mechanism. The power input end of the wheel transmission mechanism is spline-connected, the oil cylinder is located in front of the second fixed-axis gear transmission mechanism, and the rear end of the fixed reduction box housing is provided with a bridge structure installation interface; the first fixed-axis gear transmission mechanism includes a rear idler wheel and a rear gear that are externally meshed in sequence, and the second fixed-axis gear transmission mechanism includes a front gear, a front idler wheel and a front-stage final gear that are externally meshed in sequence, the cores of the front gear and the rear gear are both provided with internal splines, the core of the rear gear is matched with the external splines of a spline sleeve, the internal splines on the front gear and the internal splines on the spline sleeve are respectively matched with the external splines at the front and rear ends of a double-headed spline shaft, there are one or more rear idlers, when there are multiple rear idlers, the rear idlers are externally meshed in sequence, and the number of rear idlers in the left and right groups of gear reduction mechanisms is the same or different;The boom includes a boom housing and a rear-stage cutting transmission mechanism. The rear-stage cutting transmission mechanism includes a rear-stage first gear, a rear-stage idler gear, and a rear-stage gear shaft that are sequentially externally meshed. Each part of the rear-stage cutting transmission mechanism is arranged to extend left and right in the power transmission order. There is one or more rear-stage idler gears. When there are multiple rear-stage idler gears, they are sequentially externally meshed with each other. The rear-stage first gear is installed in the transmission housing of the boom housing. The core parts of the front-stage last gear and the rear-stage first gear are respectively provided with a front-stage spline hole and a rear-stage spline hole. The front-stage last gear and the rear-stage first gear are connected by a spline shaft to form a spline connection. The boom housing is hinged to the fixed reduction gear housing, and the hinge axis coincides with the center line of the spline connection. One end of the oil cylinder is hinged to the fixed reduction gear housing, and the other end is hinged to the boom housing. The boom housing further includes a front support arm and a rear support arm. The front support arm and the rear support arm are cantilever structures respectively connected to the transmission housing from the front and rear. The free ends of the front support arm and the rear support arm are respectively used as a front hinge ear and a rear hinge ear to be hinged to a front hinge seat and a rear hinge seat on the fixed reduction gear housing. The front hinge seat is a double-ear hinge seat. An opening is provided on the side wall of the fixed reduction gear housing between the two connecting ears of the front hinge seat. An oil cylinder connecting ear is provided outside the front hinge ear. The oil cylinder connecting ear extends into the inner cavity of the fixed reduction gear housing through the opening. The oil cylinder is hinged to the boom housing through the oil cylinder connecting ear. The oil cylinder and the front-stage cutting transmission mechanism are respectively located in different chambers, where the chamber where the oil cylinder is located is at the foremost side inside the fixed reduction gear housing. A side plate is installed on the front side of the fixed reduction gear housing. The chamber where the oil cylinder is located is surrounded by the side plate, the fixed reduction gear housing, the front hinge seat, and the front hinge ear.

2. The structure of the cutting transmission main body part according to claim 1, characterized in that: A hydraulic system is also installed on the fixed reduction gearbox housing. The hydraulic system and the oil cylinder are located in the same chamber in the fixed reduction gearbox housing. The hydraulic system includes a gear pump and a first-stage planetary speed increasing mechanism and a first-stage fixed-axis gear speed increasing mechanism that are sequentially connected in transmission. The power input end of the first-stage planetary speed increasing mechanism is spline-connected to the front end of the front gear, and the terminal gear of the first-stage fixed-axis gear speed increasing mechanism is coaxially spline-connected to the transmission shaft of the gear pump.

3. The structure of the cutting transmission main body part according to claim 2, characterized in that: An upper plate and a lower plate extending toward the arm housing are provided between the two connecting ears of the front articulated seat, and the upper plate and the lower plate are both part of the fixed reduction gearbox housing, and the outer ends of the upper plate and the lower plate are respectively arranged as an upper inner cylindrical surface and a lower inner cylindrical surface coaxial with the articulation axis of the front articulated seat, and the outside of the front articulated ear is provided with an upper outer cylindrical surface and a lower outer cylindrical surface coaxial with the articulation axis of the front articulated seat, the upper inner cylindrical surface is clearance-fitted with the upper outer cylindrical surface, and the lower inner cylindrical surface is clearance-fitted with the lower outer cylindrical surface, and the circumferential angle formed by the upper inner cylindrical surface and the lower inner cylindrical surface on the side closer to the fixed reduction gearbox housing does not exceed 180 degrees.

4. The structure of the cutting transmission main body part according to claim 3, characterized in that: The rear connecting ear of the front articulated seat is just embedded between the front supporting arm and the transmission box body and maintains a gap between the front supporting arm and the transmission box body. The front-stage final gear is installed in the rear connecting ear of the front articulated seat. An annular axial baffle is provided in the inner hole of the rear connecting ear of the front articulated seat. The front-stage final gear is located behind the axial baffle. The front pin shaft matching the front articulated seat is located in front of the axial baffle. A central through hole is provided in the front pin shaft. A spline sleeve with internal splines and external splines is installed in the front-stage spline hole. The internal splines of the spline sleeve and the rear-stage spline hole are connected to the same spline shaft. The front and rear parts are spline-connected, the internal spline of the spline sleeve is arranged in the inner hole of its rear section, the inner hole of the front section 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 the front end face core of the spline shaft is axially limited, an annular flange is provided in the middle part of the positioning sleeve, the outer cylindrical surface of the annular flange is matched with the inner hole gap of the central through hole and the axial partition at the same time, and a seal is provided between the matching surfaces, and an end face seal is provided between the rear connecting ear of the front articulated seat and the rear-stage cutting transmission mechanism and / or the transmission box.

5. The cutting transmission main body structure according to claim 1, 2, 3 or 4, characterized in that: It further includes a bridge structure. The installation interface of the bridge structure includes a horizontally forward concave and left-right extending positioning groove at the rear end of the fixed reduction gearbox housing, and a left groove and a right groove on the left and right sides of the positioning groove. Pin holes penetrating the fixed reduction gearbox housing up and down are respectively provided in the left and right grooves. On the front end face of the bridge structure, there are a horizontally forward protruding and left-right extending upper positioning boss and a lower positioning boss, and left connecting lugs and right connecting lugs horizontally protruding forward on the left and right sides of the upper and lower positioning bosses. The upper plane of the upper positioning boss and the lower plane of the lower positioning boss respectively form positioning mating surfaces with the upper and lower groove walls of the positioning groove. The left connecting lugs and the right connecting lugs are respectively inserted into the left groove and the right groove. The ear hole of the left connecting lug and the pin hole of the left groove are simultaneously engaged with the left positioning pin shaft hole, and the ear hole of the right connecting lug and the pin hole of the right groove are simultaneously engaged with the right positioning pin shaft hole.

6. The structure of the cutting transmission main body part according to claim 5, characterized in that: The bridge structure includes an intermediate box body, and a left connecting block and a right connecting block detachably fixed on the left and right sides of the intermediate box body respectively. The upper positioning boss and the lower positioning boss are located on the intermediate box body, and the left connecting lugs and the right connecting lugs are respectively located on the left connecting block and the right connecting block. The rear bottom surface of the intermediate box body is set as a horizontal plane, and the middle bottom surface is set as a horizontal plane or an arched curved surface. The thickness of the rear part of the intermediate box body in the up-down direction is less than that of the front part.

7. The cutting transmission main body structure according to claim 1, 2, 3 or 4, characterized in that: The cutting motor is a 6-pole or 8-pole motor.

8. The cutting transmission main body structure according to claim 5, characterized in that: The cutting motor is a 6-pole or 8-pole motor.

9. The cutting transmission main body structure according to claim 6, characterized in that: The cutting motor is a 6-pole or 8-pole motor.

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