High torque cutting drive system for coal mining machine

Abstract

The present invention relates to a large torque cutting transmission system for a coal mining machine, wherein the fixed reduction box comprises a fixed reduction box housing, a cutting motor and a front-stage cutting transmission mechanism arranged in the fixed reduction box housing, and the boom comprises a boom housing and a rear-stage cutting transmission mechanism, the front-stage cutting transmission mechanism comprises a primary planetary reduction mechanism, a central gear and left and right groups of large reduction ratio transmission mechanisms which are sequentially connected in transmission, the large reduction ratio transmission mechanism comprises a first fixed axis gear transmission mechanism, a high-speed planetary reduction mechanism and a second fixed axis gear transmission mechanism which are sequentially connected in transmission and arranged sequentially from back to front, the cutting motor is a 4-pole or 6-pole motor, the output shaft of which is connected to the primary planetary reduction mechanism, the front and rear-stage cutting transmission mechanisms are connected in transmission through a spline connection structure, and the boom housing is hinged to the fixed reduction box housing. The present invention has a large output torque, can realize mining with a low mining height and a wide mining range, and can improve the center of gravity arrangement of the coal mining machine.

Description

Technical Field

[0001] The invention relates to a large torque cutting transmission system for a coal mining machine, which is suitable for a coal mining machine with high power, short body and wide mining range. Background Art

[0002] The rocker arm structure of existing thin coal seam coal mining machines usually adopts a conventional structure with independent power. Although it has relatively high reliability, the rocker arm structure is relatively complex and has poor adaptability. Especially when the required mining lower limit is low, it is necessary to adopt a layout in which the rocker arm is suspended relative to the conveyor trough. In this case, the rear rocker arm has a small amount of top picking and cannot adapt to the mining of coal seams with a larger upper limit.

[0003] In order to optimize the rocker arm structure, one practice in the industry is to set the cutting transmission system into a fixed part containing power and a swinging part that outputs power. However, some designs, due to consideration of the structure of the loading channel, set part of the transmission of the fixed part above the conveyor trough, affecting the coal passing space; some rockers adopt a structure in which a planetary mechanism is set in a conventional roller, which makes it impossible to use a small-sized roller, thus limiting the lower limit of mining and affecting the mining of thin or extremely thin coal seams; some set the power and main deceleration part in front of the conveyor trough close to the coal seam side (i.e. 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 swinging 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

[0004] The present invention aims to provide a high-torque cutting transmission system for a coal mining machine, which has a large output torque and a wide mining range from low to high, can adapt to the mining of low-height coal seams, and can improve the center of gravity arrangement of the entire coal mining machine.

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

[0006] A high-torque cutting transmission system for a coal mining machine comprises a fixed reduction box and a boom, the fixed reduction box comprising a fixed reduction box housing and a cutting motor and a front-stage cutting transmission mechanism arranged in the fixed reduction box housing, the front-stage cutting transmission mechanism comprising a primary planetary reduction mechanism, a central gear and left and right groups of large reduction ratio transmission mechanisms connected in sequence, the large reduction ratio transmission mechanism comprising a first fixed-axis gear transmission mechanism, a high-speed planetary reduction mechanism and a second fixed-axis gear transmission mechanism connected in sequence, the first fixed-axis gear transmission mechanism, the high-speed planetary reduction mechanism and the second fixed-axis gear transmission mechanism are arranged in sequence from back to front, the first and second fixed-axis gear transmission mechanisms are extended left and right, the cutting motor is a 4-pole or 6-pole motor, the output shaft of the cutting motor is connected to the primary planetary reduction mechanism, the front-stage cutting transmission mechanism The output end of the structure is the front-stage final gear, the boom includes a boom housing and a rear-stage cutting transmission mechanism, the boom housing includes an L-shaped transmission case, the rear-stage cutting transmission mechanism adopts a one-stage small reduction ratio fixed-axis gear transmission mechanism, including a rear-stage first gear, a rear-stage idler gear and a rear-stage gear shaft that are externally meshed in sequence, the rear-stage first gear is installed inside the free ends of the left and right extensions of the transmission case, the free ends of the front and rear extensions of the transmission case are cylindrical, the rear-stage gear shaft is installed in 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-stage gear shaft is provided with a roller positioning and mounting structure, the front-stage final gear and the rear-stage first gear are transmission-connected by a spline connection structure, the boom housing is hinged to the fixed reduction box housing, and the hinge axis coincides with the center line of the spline connection structure.

[0007] The core of the planetary carrier of the first-stage planetary reduction mechanism and the core of the central gear are respectively provided with internal splines, the planetary carrier of the first-stage planetary reduction mechanism and the central gear are spline-connected with the front and rear parts of the same spline shaft, the central gear is externally meshed with the input end gear of the first fixed-axis gear transmission mechanism, the output end gear of the first fixed-axis gear transmission mechanism is spline-connected with the sun gear of the high-speed planetary reduction mechanism, the core of the planetary carrier of the high-speed planetary reduction mechanism and the input end gear of the second fixed-axis gear transmission mechanism are respectively provided with internal splines, the planetary carrier of the high-speed planetary reduction mechanism and the input end gear of the second fixed-axis gear transmission mechanism are spline-connected with the front and rear parts of the same spline shaft.

[0008] The inner gear ring of the high-speed planetary reduction mechanism extends axially forward to form a cylindrical hollow shell, the input end gear of the second fixed-axis gear transmission mechanism is installed in the cavity of the hollow shell, and the end of the hollow shell close to the high-speed planetary reduction mechanism is provided with a circle of annular bosses cantilevered into the cavity, the rear end of the input end gear of the second fixed-axis gear transmission mechanism is rotatably supported on the annular boss, and an opening is provided on the side wall of the hollow shell, and the hollow shell is fixedly installed in the fixed reduction box shell.

[0009] The width of the opening on the side wall of the hollow shell is equal to the inner diameter of the hollow shell, the upper inner wall and the lower inner wall of the opening are both planes and tangent to the right or left semi-cylindrical side wall of the hollow shell, and the three sides form a U-shape with the opening facing left or right.

[0010] 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, in which a spline sleeve with internal splines and external splines is installed, and the internal splines of the spline sleeve and the rear-stage spline hole are respectively connected with the front and rear splines of the same spline shaft.

[0011] The arm housing also includes a front supporting arm and a rear supporting arm respectively located in front and rear of the left and right extension sections of the transmission box body, the front supporting arm and the rear supporting arm are cantilever structures connected to the transmission box body at one end, the free ends of the front supporting arm and the rear supporting arm are respectively hinged to the front hinge seat and the rear hinge seat on the fixed reduction box housing as front hinge ears and rear hinge ears, a cylinder connecting ear is provided on the outside of the free end of the front supporting arm, and a cylinder is provided in the inner cavity of the fixed reduction box housing, one end of the cylinder is hinged to the fixed reduction box housing, and the other end is hinged to the arm housing through the cylinder connecting ear, the 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.

[0012] The front support arm is L-shaped, the free ends of the left and right extension sections of the front support arm are the free ends of the front support arm, the rear ends of the front and rear extension sections of the front support arm are connected to the transmission box, the top surfaces of the front and rear extension sections of the front support arm are inclined, and the height decreases as it is farther away from the free end.

[0013] The cylinder and the second fixed-axis gear transmission mechanism are arranged in different chambers in the inner cavity of the fixed reduction gearbox housing. The chamber where the cylinder is located is located at the frontmost side of the fixed reduction gearbox housing. The front articulated seat is a double-ear articulated seat. An opening is provided on the side wall of the fixed reduction gearbox housing between the two connecting ears of the front articulated seat. The cylinder connecting ear extends into the chamber where the cylinder is located from the opening. The chamber where the cylinder is located is surrounded by the fixed reduction gearbox housing, the front support arm, the front articulated seat and a side panel installed on the front side of the fixed reduction gearbox housing.

[0014] 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 reducer 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 an upper outer cylindrical surface and a lower outer cylindrical surface coaxial with the articulation axis of the front articulated seat are arranged on the outside of the front articulated ear, and the upper inner cylindrical surface is clearance-matched with the upper outer cylindrical surface, and the lower inner cylindrical surface is clearance-matched with the lower outer cylindrical surface.

[0015] The hinges between the front support arm and the rear support arm and the fixed reduction box housing are lubricated by arranging a front automatic lubrication device and a rear automatic lubrication device respectively.

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

[0017] The present invention adopts a front-stage cutting transmission mechanism with a multi-stage and large reduction ratio including a high-speed planetary mechanism, and cooperates with a medium to high power multi-pole motor (4-pole or 6-pole), which can make the cutting transmission system operate within a lower speed range while having a larger output torque. Therefore, it can better adapt to the mining requirements of complex working faces during mining of thin or extremely thin coal seams.

[0018] As the main deceleration part of the cutting transmission system, the front-stage cutting transmission mechanism is arranged in the fixed reduction box housing and does not swing with the boom. What swings with the boom is a first-stage small reduction ratio fixed-axis gear transmission mechanism, and this mechanism is located behind the drum, so it does not affect the interference between the boom and the coal platform during the top picking operation.

[0019] The drum can be installed by putting the drum on the front and rear extension sections of the cylindrical transmission box body, so that the front part of the drum is coaxially connected with the rear gear shaft through the drum positioning and installation structure. The connection is simple and can be matched with a very small diameter drum, so it can adapt to the mining of low-height coal seams and is more convenient to maintain.

[0020] A cutting motor is used to drive the gear reduction mechanisms arranged on the left and right sides thereof, and transmit power to the left and right booms respectively, so as to make full use of the cutting power, improve the use efficiency and reduce the idling transmission motion loss.

[0021] Placing the oil cylinder, which occupies a large space but is lightweight, in front of the front-stage cutting transmission mechanism can make the front-stage cutting transmission mechanism, especially the heavier components such as the planetary mechanism therein, as close as possible to the supporting legs (or conveyor shovel plates) of the coal mining machine, so that the overall center of gravity of the coal mining machine is shifted toward the mining side, thereby improving the stability of the coal mining machine in both stationary and moving states.

[0022] A primary spline transmission is formed between the front stage final gear and the spline sleeve, and a secondary spline transmission is formed between the spline sleeve and the spline shaft, and between the spline shaft and the rear stage first gear. Since multiple spline connection structures with side clearance are adopted, the radial floating amount is increased, and since the related parts forming the spline connection structure can be automatically centered, the radial offset caused by the wear of the rotating support surface at both ends of the axial direction of the transmission parts has little effect on the transmission meshing, and the transmission structure between the front and rear stage cutting transmission mechanisms has improved adaptability to the wear of the rotating support surfaces at both ends of the axial direction, so the reliability of power transmission between the rocker arm and the fixed reduction box can be significantly improved.

[0023] By adding front automatic lubrication devices and rear automatic lubrication devices at the front and rear support connection points, automatic, effective and long-term lubrication of the support load-bearing surface can be guaranteed, wear can be reduced, and the service life of the support connection points can be extended.

[0024] Since the cylinder connecting ear is relatively close to the hinge axis between the free end of the front support arm and the fixed reduction box housing, the force arm driving the boom housing to swing is shorter, and correspondingly the swing angle range of the boom housing is larger, which is equivalent to a wider range of achievable mining heights.

[0025] Placing the oil cylinder in an independent chamber can provide a good basic working environment for the oil cylinder to swing and improve the reliability of the oil cylinder. Furthermore, by setting two upper and lower cylindrical clearance matching surfaces at the hinge between the front support arm and the fixed reducer housing, the only channel in the chamber where the oil cylinder is located that communicates with the outside world is relatively closed without affecting the swing of the arm housing, which can better isolate foreign matter such as coal powder, thereby ensuring that the chamber where the oil cylinder is located always maintains a better working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a partial structure of an embodiment of the present invention;

[0027] Figure 2 for Figure 1 A schematic diagram of the structure of the fixed reduction gearbox;

[0028] Figure 3 It is a structural schematic diagram of the connection between the high-speed planetary reduction mechanism and the second fixed-axis gear transmission mechanism;

[0029] Figure 4 A side view of a coal mining machine using the present invention;

[0030] Figure 5 for Figure 1 A schematic diagram of the structure of the boom described in the embodiment of the present invention;

[0031] Figure 6 It is an enlarged view of the power transmission structure between the front-stage cutting transmission mechanism and the rear-stage cutting transmission mechanism;

[0032] Figure 7 for Figure 1 AA section view.

[0033] Reference numerals:

[0034] 1. Boom; 11. Boom housing; 111. Transmission housing; 112. Front support arm; 1121. Inclined surface; 1122. Cylinder connecting ear; 1123. Upper outer cylindrical surface; 1124. Lower outer cylindrical surface; 113. Rear support arm; 121. Rear stage first gear; 122. Rear stage idler gear; 123. Rear stage gear shaft; 14. Front automatic lubrication device; 15. Rear automatic lubrication device;

[0035] 2. Fixed reduction gearbox; 21. Fixed reduction gearbox housing; 211. Front articulated seat; 2113. Upper inner cylindrical surface; 2114. Lower inner cylindrical surface; 212. Rear articulated seat; 214. Upper plate; 215. Lower plate; 24. Primary planetary reduction mechanism; 25. Central gear; 261. First fixed-axis gear transmission mechanism; 262. High-speed planetary reduction mechanism; 2621. Planet carrier of high-speed planetary reduction mechanism; 2622. Inner gear ring of high-speed planetary reduction mechanism; 2623. Hollow housing; 2624. Sun gear of high-speed planetary reduction mechanism; 263. Second fixed-axis gear transmission mechanism; 2631. Input end gear of second fixed-axis gear transmission mechanism; 2632. Front stage final gear; 29. ​​Side plate;

[0036] 3. Roller;

[0037] 4. Oil cylinder;

[0038] 5. Spline shaft;

[0039] 6. Spline sleeve;

[0040] 7. Cutting motor;

[0041] 91. Conveyor; 92. Support legs. DETAILED DESCRIPTION

[0042] The present invention discloses a high torque cutting transmission system for a coal mining machine. Figure 1-7As shown, it includes a fixed reduction box 2 and a boom 1, and the fixed reduction box includes a fixed reduction box housing 21, 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 first-stage planetary reduction mechanism 24, a central gear 25 and two groups of left and right large reduction ratio transmission mechanisms that are sequentially connected. The large reduction ratio transmission mechanism includes a first fixed-axis gear transmission mechanism 261, a high-speed planetary reduction mechanism 262 and a second fixed-axis gear transmission mechanism 263 that are sequentially connected. The first fixed-axis gear transmission mechanism, the high-speed planetary reduction mechanism and the second fixed-axis gear transmission mechanism are arranged sequentially from back to front, and the first and second fixed-axis gear transmission mechanisms are arranged extending left and right. The cutting motor is a 4-pole or 6-pole motor, and the output shaft of the cutting motor is connected to the first-stage planetary reduction mechanism. The output end of the front-stage cutting transmission mechanism is a front-stage final gear, and the front-stage final gear is installed in the fixed reduction box housing through a bearing rotation support.

[0043] The arm frame includes an arm frame housing 11 and a rear-stage cutting transmission mechanism, and the arm frame housing includes an L-shaped transmission box 111. The rear-stage cutting transmission mechanism adopts a one-stage fixed-axis gear transmission mechanism with a small reduction ratio, including a rear-stage first gear 121, a rear-stage idler 122 and a rear-stage gear shaft 123 that are meshed externally in sequence. The rear-stage first gear is rotatably supported and installed inside the free ends of the left and right extension sections of the transmission box through a bearing, and the rear-stage idler is rotatably supported on the rear-stage idler shaft through a bearing, and the rear-stage idler shaft is fixedly installed in the left and right extension sections of the transmission box. The free ends of the front and rear extension sections of the transmission box are cylindrical, and the rear-stage gear shaft is installed in the front and rear extension sections of the transmission box, and its terminal portion extends forward and outward to expose the free ends of the front and rear extension sections. The terminal portion of the rear-stage gear shaft is provided with a roller positioning and mounting structure for mounting a roller 3. When the roller is installed, the roller is sleeved on the front and rear extension sections of the transmission box, and the front portion of the roller is coaxially connected to the rear-stage gear shaft through the roller positioning and mounting structure. The front stage final gear and the rear stage first gear can be connected by a spline connection structure. The arm housing is hinged to the fixed reduction box housing, and the hinge axis coincides with the center line of the spline connection structure.

[0044] The present invention adopts a front-stage cutting transmission mechanism with a multi-stage and large reduction ratio including a high-speed planetary mechanism, and cooperates with a medium to high power multi-pole motor (4-pole or 6-pole), which can make the cutting transmission system operate within a lower speed range while having a larger output torque. Therefore, it can better adapt to the mining requirements of complex working faces during mining of thin or extremely thin coal seams.

[0045] As the main deceleration part of the cutting transmission system, the front-stage cutting transmission mechanism is arranged in the fixed reduction box housing and does not swing with the boom. What swings with the boom is a first-stage fixed-axis gear transmission mechanism with a small reduction ratio, and this mechanism is located behind the drum, so it does not affect the interference between the boom and the coal platform during the top picking operation. Since the position where the drum 3 is installed is only the free end of the front and rear extension sections of the cylindrical transmission box and the exposed end of the rear-stage gear shaft, the connection structure is simple and can be matched with a very small diameter drum, so it can adapt to the mining of low-height coal seams and is more convenient for maintenance.

[0046] A cutting motor is used to drive the gear reduction mechanisms arranged on the left and right sides thereof, and transmit power to the left and right booms respectively, so as to make full use of the cutting power, improve the use efficiency and reduce the idling transmission motion loss.

[0047] The core of the planet carrier of the first-stage planetary reduction mechanism and the core of the sun gear can each be provided with an internal spline. The planet carrier of the first-stage planetary reduction mechanism and the sun gear are spline-connected with the front and rear parts of the same spline shaft. Through the spline connection, the power is transmitted from the first-stage planetary reduction mechanism to the sun gear. The sun gear is externally meshed with the input end gear of the first fixed axis gear transmission mechanism. Since the large reduction ratio transmission mechanism has two groups on the left and right, starting from the sun gear, the power is dispersed and transmitted in the left and right directions at the same time, and finally transmitted to the left and right arms. The output end gear of the first fixed axis gear transmission mechanism is spline-connected with the sun gear 2624 of the high-speed planetary reduction mechanism. In the embodiment shown in the accompanying drawings, the sun gear of the high-speed planetary reduction mechanism is spline-connected through the external spline of the rear part thereof and the internal spline of a spline sleeve, and the external spline of the spline sleeve is spline-connected with the internal spline of the output end gear core of the first fixed axis gear transmission mechanism. The planet carrier 2621 of the high-speed planetary reduction mechanism and the input end gear 2631 of the second fixed-axis gear transmission mechanism can be provided with internal splines at their respective cores, and the planet carrier of the high-speed planetary reduction mechanism and the input end gear of the second fixed-axis gear transmission mechanism are connected to the front and rear splines of the same spline shaft.

[0048] One or more idler gears may be arranged between the input end gear and the output end gear of the first fixed axis gear transmission mechanism 261. In the same fixed reduction box housing, when the number of idler gears in the left and right sets of the first fixed axis gear transmission 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 2 ). When the number of the left and right idler wheels is an odd number and the other is an even number, the left and right arm frames with the same specifications can make the left and right rollers turn in different directions.

[0049] The inner gear ring 2622 of the high-speed planetary reduction mechanism extends forward in the axial direction to form a cylindrical hollow shell 2623, and the input end gear of the second fixed axis gear transmission mechanism is installed in the cavity of the hollow shell. The end of the hollow shell close to the high-speed planetary reduction mechanism is provided with a circle of annular bosses extending into the cavity, and the rear end of the input end gear of the second fixed axis gear transmission mechanism is rotatably supported on the annular boss. An opening is provided on the side wall of the hollow shell so that the input end gear of the second fixed axis gear transmission mechanism can mesh with other gears outside, thereby continuing the transmission of power. The hollow shell is fixedly installed in the fixed reduction box shell.

[0050] The input end gear 2631 of the second fixed axis gear transmission mechanism and the high-speed planetary reduction mechanism are only supported by the annular boss, which has a simple structure and occupies a small axial space. The input end gear of the second fixed axis gear transmission mechanism can be as close to the high-speed planetary reduction mechanism as possible, and the center of gravity of the coal mining machine can be shifted to the goaf side as much as possible, which is more beneficial to the support stability of the coal mining machine. Since the input end gear of the second fixed axis gear transmission mechanism and the high-speed planetary reduction mechanism are larger and heavier parts in the front-stage cutting transmission mechanism, 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.

[0051] The width (vertical and axial direction) of the opening on the side wall of the hollow shell is preferably equal to the inner diameter of the hollow shell, so as to accommodate the smooth disassembly and assembly of a larger gear meshing with the outer surface thereof. The upper inner wall and the lower inner wall of the opening are both planes and are tangent to the right or left semi-cylindrical side wall of the hollow shell, and the three sides form a U-shape with the opening facing left or right.

[0052] 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, and a spline sleeve 6 with internal and external splines is installed in the front-stage spline hole, and the external splines of the spline sleeve match the front-stage spline hole. The internal splines of the spline sleeve and the rear-stage spline hole are respectively connected with the front and rear splines of the same spline shaft 5. The rotation of the front-stage final gear drives the spline sleeve to rotate, the spline sleeve drives the spline shaft to rotate, and the spline shaft drives the rear-stage first gear to rotate, thereby realizing the transmission of power from the front-stage cutting transmission mechanism to the rear-stage cutting transmission mechanism.

[0053] A primary spline transmission is formed between the front stage final gear and the spline sleeve, and a secondary spline transmission is formed between the spline sleeve and the spline shaft, and between the spline shaft and the rear stage first gear. Since the related parts forming the spline connection structure can be automatically centered, the radial offset caused by the wear of the rotating support surface at both ends of the axial direction of the transmission parts has little effect on the transmission meshing, so the reliability of power transmission between the rocker arm and the fixed reduction box can be significantly improved.

[0054] The arm housing 11 also includes a front support arm 112 and a rear support arm 113 located in front of and behind the left and right extension sections of the transmission housing 111, respectively. The front support arm and the rear support arm are cantilever structures with one end connected to the transmission housing. The front support arm, the rear support arm and the transmission housing are an integrated structure. 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 between the front support arm and the rear support arm and the top coal platform when the arm housing is in the upper cutting limit position as much as possible, so that the mining height can be higher. For the mining of extremely thin or thin coal seams, the rocker arm of the present invention can meet both the lower mining limit and the higher mining limit, so that a wider mining range can be formed, which can be applied to short-body coal mining machines.

[0055] The free end of the front support arm and the free end of 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. The free end of the front support arm is provided with a cylinder connecting ear 1122 on the outside. The inner cavity of the fixed reduction box housing is provided with a cylinder 4, one end of the cylinder is hinged to the fixed reduction box housing, and the other end is hinged to the boom housing through the cylinder connecting ear. The boom housing is driven to swing along a fixed axis by the extension and contraction of the cylinder. Since the cylinder connecting ear in this structure is relatively close to the hinge axis between the free end of the front support arm and the fixed reduction box housing, the force arm driving the boom housing to swing is shorter, and accordingly the swing angle range of the boom housing is larger, which is equivalent to a wider range of mining heights that can be achieved. The cylinder is located in front of the second fixed axis gear transmission mechanism. By placing a cylinder that takes up a large space but is light in weight in front of the front-stage cutting transmission mechanism, the front-stage cutting transmission mechanism can be placed as close as possible to the support leg 92 (or conveyor shovel plate) of the coal mining machine, so that the overall center of gravity of the coal mining machine is shifted toward the mining side, thereby improving the stability of the coal mining machine in both stationary and walking states.

[0056] The rear end of the fixed reduction box housing is provided with a bridge structure installation interface. When the three machines are coordinated, the bridge structure is located above the conveyor 91, and the fixed reduction box is located at the front side of the conveyor, between the left and right rollers, which can adapt to low mining heights. Since the bridge structure and the fixed reduction box are detachably fixedly connected, they can be disassembled and transported separately during transportation, thus solving the problem of limited space during transportation down the well.

[0057] The front support arm is L-shaped, the free ends of the left and right extensions of the front support arm are the free ends of the front support arm, the rear ends of the front and rear extensions of the front support arm are connected to the transmission box, the top surfaces of the front and rear extensions of the front support arm are inclined surfaces 1121, and the farther away from the free end, the lower the height, that is, the closer to the drum, the lower the height. When the arm is swung up, the setting of the inclined surface can prevent the front support arm from interfering with the top coal platform.

[0058] The cylinder and the second fixed-axis gear transmission mechanism are arranged in different chambers in the inner cavity of the fixed reduction gearbox housing. The chamber where the cylinder is located is located at the frontmost side of the fixed reduction gearbox housing. The front articulated seat and the rear articulated seat are both double-ear articulated seats. An opening is provided on the side wall of the fixed reduction gearbox housing between the two connecting ears of the front articulated seat. The cylinder connecting ear extends into the chamber where the cylinder is located from the opening. The chamber where the cylinder is located is surrounded by the fixed reduction gearbox housing, the front support arm, the front articulated seat and a side plate 29 installed on the front side of the fixed reduction gearbox housing. Placing the cylinder in an independent chamber can provide a good working environment for the swing of the cylinder and improve the reliability of the cylinder's operation.

[0059] The two connecting ears of the front hinge seat are preferably provided with an upper plate 214 and a lower plate 215 extending outward toward the arm housing (see Figure 7 ), the upper plate and the lower plate are both part of the fixed reduction box housing, for example, they can be the local extension of the top plate and the bottom plate of the fixed reduction box housing. The outer ends of the upper plate and the lower plate are 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, and 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 clearance matched, and the lower inner cylindrical surface and the lower outer cylindrical surface are clearance matched. The clearance matching of these two places does not affect the swing of the boom housing, and also makes the only channel of the chamber where the oil cylinder is located that communicates with the outside world relatively closed, which can better isolate foreign matter such as coal powder, thereby ensuring 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-full-circle 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 clearances are always effective during the swing of the boom housing, so that the cylinder installation cavity can always be kept clean. The circumferential angle formed by the upper inner cylindrical surface and the lower inner cylindrical surface on the side closer to the fixed reduction box housing does not exceed 180 degrees, so as to ensure the smooth connection and installation between the front articulation ear and the front articulation seat.

[0060] The hinges of the front support arm and the rear support arm with the fixed reduction box housing are respectively lubricated by arranging a front automatic lubrication device 14 and a rear automatic lubrication device 15. By adding the front automatic lubrication device and the rear automatic lubrication device at the front and rear support connection points, the automatic, effective and long-term lubrication of the support force surface can be ensured, the wear can be reduced, and the service life of the support connection points can be extended.

[0061] In this paper, the front and the direction are respectively Figure 2 The upper and lower directions in the figure are consistent.

Claims

1. A high torque cutting transmission system for a coal mining machine, characterized in that: It includes a fixed reduction box and an arm, the fixed reduction box includes a fixed reduction box housing and 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 first-stage planetary reduction mechanism, a central gear and left and right two sets of large reduction ratio transmission mechanisms that are sequentially connected in transmission, the large reduction ratio transmission mechanism includes a first fixed-axis gear transmission mechanism, a high-speed planetary reduction mechanism and a second fixed-axis gear transmission mechanism that are sequentially connected in transmission, the first fixed-axis gear transmission mechanism, the high-speed planetary reduction mechanism and the second fixed-axis gear transmission mechanism are arranged in sequence from back to front, the first and second fixed-axis gear transmission mechanisms are extended left and right, the cutting motor is a 4-pole or 6-pole motor, and the cutting motor The output shaft of the machine is connected to the first-stage planetary reduction mechanism, the output end of the front-stage cutting transmission mechanism is the front-stage final gear, the boom includes a boom housing and a rear-stage cutting transmission mechanism, the boom housing includes an L-shaped transmission box, the rear-stage cutting transmission mechanism adopts a first-stage small reduction ratio fixed-axis gear transmission mechanism, including a rear-stage first gear, a rear-stage idler gear and a rear-stage gear shaft that are meshed externally in sequence, the rear-stage first gear is installed inside the free ends of the left and right extension sections of the transmission box, the free ends of the front and rear extension sections of the transmission box are cylindrical, the rear-stage gear shaft is installed in the front and rear extension sections of the transmission box and its terminal end extends forward and outward to expose the free ends of the front and rear extension sections, and the terminal end of the rear-stage gear shaft is provided with a roller positioning The mounting structure, the front-stage final gear and the rear-stage first gear are connected by a spline connection structure, the arm housing is hinged to the fixed reduction box housing, and the hinge axis coincides with the center line of the spline connection structure; the core of the planet carrier of the first-stage planetary reduction mechanism and the core of the central gear are respectively provided with internal splines, the planet carrier of the first-stage planetary reduction mechanism and the central gear are spline-connected to the front and rear parts of the same spline shaft, the central gear is externally meshed with the input end gear of the first fixed-axis gear transmission mechanism, the output end gear of the first fixed-axis gear transmission mechanism is spline-connected to the sun gear of the high-speed planetary reduction mechanism, the planet carrier of the high-speed planetary reduction mechanism and the input end gear of the second fixed-axis gear transmission mechanism The core of each wheel is provided with an internal spline, and the planetary carrier of the high-speed planetary reduction mechanism and the input end gear of the second fixed-axis gear transmission mechanism are spline-connected with the front and rear parts of the same spline shaft; the inner gear ring of the high-speed planetary reduction mechanism extends axially forward to form a cylindrical hollow shell, and the input end gear of the second fixed-axis gear transmission mechanism is installed in the cavity of the hollow shell, and the end of the hollow shell close to the high-speed planetary reduction mechanism is provided with a circle of annular bosses cantilevered into the cavity, and the rear end of the input end gear of the second fixed-axis gear transmission mechanism is rotatably supported on the annular boss, and an opening is provided on the side wall of the hollow shell, and the hollow shell is fixedly installed in the fixed reduction box shell.

2. The high torque cutting transmission system for coal mining machine according to claim 1, characterized in that: The width of the opening on the side wall of the hollow shell is equal to the inner diameter of the hollow shell, the upper inner wall and the lower inner wall of the opening are both planes and tangent to the right or left semi-cylindrical side wall of the hollow shell, and the three sides form a U-shape with the opening facing left or right.

3. The high torque cutting transmission system for coal mining machine according to claim 1 or 2, characterized in that: 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, in which a spline sleeve with internal splines and external splines is installed, and the internal splines of the spline sleeve and the rear-stage spline hole are respectively connected with the front and rear splines of the same spline shaft.

4. The high torque cutting transmission system for coal mining machine according to claim 1 or 2, characterized in that: The arm housing also includes a front supporting arm and a rear supporting arm respectively located in front and rear of the left and right extension sections of the transmission box body, the front supporting arm and the rear supporting arm are cantilever structures connected to the transmission box body at one end, the free ends of the front supporting arm and the rear supporting arm are respectively hinged to the front hinge seat and the rear hinge seat on the fixed reduction box housing as front hinge ears and rear hinge ears, a cylinder connecting ear is provided on the outside of the free end of the front supporting arm, and a cylinder is provided in the inner cavity of the fixed reduction box housing, one end of the cylinder is hinged to the fixed reduction box housing, and the other end is hinged to the arm housing through the cylinder connecting ear, the 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.

5. The high torque cutting transmission system for coal mining machine according to claim 4, characterized in that: The front support arm is L-shaped, the free ends of the left and right extension sections of the front support arm are the free ends of the front support arm, the rear ends of the front and rear extension sections of the front support arm are connected to the transmission box, the top surfaces of the front and rear extension sections of the front support arm are inclined, and the height decreases as it is farther away from the free end.

6. The high torque cutting transmission system for coal mining machine according to claim 4, characterized in that: The cylinder and the second fixed-axis gear transmission mechanism are arranged in different chambers in the inner cavity of the fixed reduction gearbox housing. The chamber where the cylinder is located is located at the frontmost side of the fixed reduction gearbox housing. The front articulated seat is a double-ear articulated seat. An opening is provided on the side wall of the fixed reduction gearbox housing between the two connecting ears of the front articulated seat. The cylinder connecting ear extends into the chamber where the cylinder is located from the opening. The chamber where the cylinder is located is surrounded by the fixed reduction gearbox housing, the front support arm, the front articulated seat and a side panel installed on the front side of the fixed reduction gearbox housing.

7. The high torque cutting transmission system for coal mining machine according to claim 6, 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 reducer 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 an upper outer cylindrical surface and a lower outer cylindrical surface coaxial with the articulation axis of the front articulated seat are arranged on the outside of the front articulated ear, and the upper inner cylindrical surface is clearance-matched with the upper outer cylindrical surface, and the lower inner cylindrical surface is clearance-matched with the lower outer cylindrical surface.

8. The high torque cutting transmission system for coal mining machine according to claim 4, characterized in that: The hinges between the front support arm and the rear support arm and the fixed reduction box housing are respectively lubricated by arranging a front automatic lubrication device and a rear automatic lubrication device.

9. The high torque cutting transmission system for coal mining machine according to claim 3, characterized in that: The arm housing also includes a front supporting arm and a rear supporting arm respectively located in front and rear of the left and right extension sections of the transmission box body, the front supporting arm and the rear supporting arm are cantilever structures connected to the transmission box body at one end, the free ends of the front supporting arm and the rear supporting arm are respectively hinged to the front hinge seat and the rear hinge seat on the fixed reduction box housing as front hinge ears and rear hinge ears, a cylinder connecting ear is provided on the outside of the free end of the front supporting arm, and a cylinder is provided in the inner cavity of the fixed reduction box housing, one end of the cylinder is hinged to the fixed reduction box housing, and the other end is hinged to the arm housing through the cylinder connecting ear, the 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.

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