Large torque output cutting transmission body

Abstract

The present invention relates to a large torque output cutting transmission main body, including 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 first-stage planetary reduction mechanism, a central gear and left and right groups 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 and arranged from back to front, the cutting motor is a 4-pole or 6-pole motor, and an external spline is provided on the output shaft of the cutting motor, and the external spline forms a spline connection with the internal spline of the core of the sun gear of the first-stage planetary reduction mechanism, and the oil cylinder is located in front of the second fixed-axis gear transmission mechanism. The present invention has a large output torque, can take into account the problems of loading channel and downhole transportation, 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 large torque output cutting transmission main body, which is suitable for a coal mining machine with high power, short body and 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 arm to the coal seam, the cutting transmission system is usually set to consist of a fixed part with a short structure type containing power and a swing part that outputs power. However, 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 the 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. Even if a relatively simple transmission structure is adopted, since it is often necessary to match a small and medium-power multi-pole motor to achieve a lower range of speed, the cutting capacity is often not easy to meet the working face mining under complex conditions. Summary of the invention

[0003] The present invention aims to provide a large torque output cutting transmission main body, which has a large output torque, can avoid the problem of difficult transportation down the mine while taking into account the loading channel, 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 large torque output cutting transmission main body, including a fixed reduction box, the fixed reduction box including 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 including a first-stage planetary reduction mechanism, a central gear and left and right two sets of large reduction ratio transmission mechanisms connected in sequence, the large reduction ratio transmission mechanism including 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, an external spline is provided on the output shaft of the cutting motor, the external spline forms a spline connection with the internal spline of the core of the sun gear of the first-stage planetary reduction mechanism, and the oil cylinder is located in front of the second fixed-axis gear transmission mechanism.

[0006] The large torque output cutting transmission main body also includes a bridge structure, the front end surface of the bridge structure is provided with an upper positioning boss and a lower positioning boss which are horizontally protruding forward and extending left and right, and a left connecting ear and a right connecting ear which are located on the left and right sides of the upper and lower positioning bosses and extend forward horizontally. The rear end surface of the fixed reduction box housing is provided with a positioning groove which is horizontally concave forward and extending left and right. The left and right sides of the positioning groove are also respectively provided with a left groove and a right groove, and the left and right grooves are respectively provided with a pin hole which passes through the fixed reduction box housing up and down. The upper plane of the upper positioning boss and the lower plane of the lower positioning boss respectively form positioning matching surfaces with the upper groove wall and the lower groove wall of the positioning groove, and the left connecting ear and the right connecting ear are respectively inserted into the left groove and the right groove, and 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.

[0007] The large torque output cutting transmission main body also includes a pump speed increasing transmission system, which includes a two-stage series planetary speed increasing mechanism and a first-stage fixed-axis gear speed increasing mechanism that are sequentially connected in transmission. The power input end and power output end of the two-stage series planetary speed increasing mechanism are respectively the planetary carrier of the first-stage planetary mechanism and the sun gear of the second-stage planetary mechanism. The power input end and power output end of the first-stage fixed-axis gear speed increasing mechanism are respectively the head gear and the terminal gear. The front end of the input end gear of the second fixed-axis gear transmission mechanism is provided with two stepped grooves with a larger front and a smaller rear. The inner gear ring of the first-stage planetary mechanism is installed in the front groove and is fixed relative to the fixed reduction box housing. The rear end of the planetary carrier of the first-stage planetary mechanism is arranged as an external spline, and the external spline cooperates with the internal spline arranged in the rear groove to form a spline connection.

[0008] The pump speed increasing transmission system also includes an end cover fixed relative to the fixed reduction box housing, the end cover having an outer shape of a step-shaped body with a larger front and a smaller rear. The front and rear parts of the end cover are respectively provided with a front chamber open in the front and a rear chamber open in the rear, the front and rear chambers are communicated with each other, the rear part of the end cover is inserted into the front groove, and is overlapped and fixedly connected with the inner gear ring of the first-stage planetary mechanism front and back, the main body of the second-stage planetary mechanism is installed in the rear chamber of the end cover, the rear part of the end cover is provided with an internal gear, and the rear part of the end cover serves as the inner gear ring of the second-stage planetary mechanism with the aid of the internal gear, the first-stage fixed-axis gear speed increasing mechanism is installed in the front chamber of the end cover, and the output end of the sun gear of the second-stage planetary mechanism is arranged as an external spline, which extends forward and cooperates with the internal spline of the core of the head gear to form a spline connection.

[0009] The pump speed increasing transmission system also includes a boom housing, wherein the free end of the front support arm and the free end of the rear support arm of the boom housing 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. The front hinge seat is a double-ear hinge seat, and an opening is provided on the side wall of the fixed reduction box housing between the two connecting ears of the front hinge seat, and the free end of the front support arm is provided with a cylinder connecting ear on the outside, and the cylinder connecting ear extends into the inner cavity of the fixed reduction box housing from the opening, one end of the cylinder is hinged to the boom housing through the cylinder connecting ear, and the other end is hinged to the fixed reduction box housing, and the cylinder and the front-stage cutting transmission mechanism are respectively located in different chambers, wherein the chamber where the cylinder is located is located at the frontmost side of the fixed reduction box housing, and a side plate is installed on the front side of the fixed reduction box housing, and the chamber where the cylinder is located is surrounded by the side plate, the fixed reduction box housing, the front hinge seat and the free end of the front support arm.

[0010] 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.

[0011] The beneficial effects of the present invention are:

[0012] The present invention adopts a multi-stage, large-reduction-ratio front-stage cutting transmission mechanism including a high-speed planetary mechanism in combination with a medium-to-high-power multi-pole motor, which can keep the cutting transmission system 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.

[0013] The present invention arranges the oil cylinder which occupies a large space but is obviously lighter than the front-stage cutting transmission mechanism in front of the front-stage cutting transmission mechanism, so that the front-stage cutting transmission mechanism, especially the heavier components such as the planetary mechanism therein, can be placed 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 to the mining side, thereby improving the stability of the coal mining machine in both stationary and walking states.

[0014] When the three machines are coordinated, the bridge structure is located above the conveyor, and the fixed reduction box and the arm are located at the front side of the conveyor, between the left and right rollers, which can adapt to low mining heights, reduce the height of the machine body, and take into account the loading channel. 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.

[0015] The upper positioning boss, the lower positioning boss and the positioning groove form a flat stop for positioning in the upper and lower directions. When positioned and connected, the supporting surface is longer and the stress condition is better. Combined with the pin positioning on the left and right sides, a reliable connection between the fixed reducer and the bridge structure can be achieved.

[0016] The bridge structure adopts a structure with several left and right parts, and the upper positioning boss and the lower positioning boss are set on the middle box body, and the left and right connecting ears are set on the left and right connecting blocks. When the 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 and will not be scrapped due to damage to the connecting ear on any side. Therefore, the service life is long and the maintenance cost is significantly reduced. When a wider conveyor is required, only the left and right connecting blocks and the corresponding connecting parts can be replaced to achieve a longer production cycle.

[0017] A power output branch is derived from the input end gear of the second fixed-axis gear transmission mechanism in the front-stage cutting transmission mechanism, and is transmitted to the gear pump of the hydraulic system through the second-stage series planetary speed increasing mechanism and the first-stage fixed-axis gear speed increasing mechanism. Therefore, the gear pump does not need to be equipped with a separate pump motor, thus saving costs.

[0018] The front-stage cutting transmission mechanism is a reduction transmission mechanism. The pump speed-increasing transmission system can be used to increase the speed of a certain node after deceleration, and finally increase the speed of the gear pump to the required speed to achieve the normal working state of the gear pump. The use of the two-stage series planetary speed-increasing mechanism can achieve a larger speed-increasing ratio with a smaller space occupation, which is very helpful to save installation space and make the system more compact.

[0019] Since the two-stage series planetary speed increasing mechanism is arranged in the groove of the input end gear of the second fixed axis gear transmission mechanism, and the one-stage fixed axis gear speed increasing mechanism is arranged in the front chamber of the end cover, the installation space of the pump speed increasing transmission system is further saved, especially the axial space occupation is reduced. The pump speed increasing transmission system realizes a compact setting. When the hydraulic system and the oil cylinder share a chamber, the compact setting can ensure that the oil cylinder has sufficient setting space in the front and rear directions. Therefore, the compact setting also makes the pump speed increasing transmission system suitable for thin or ultra-thin coal seam shearers.

[0020] 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. When the three machines are coordinated, large-size structures such as the high-speed planetary reduction mechanism are located in front of the front beam of the support and the conveyor and as far away from the front beam of the support and the conveyor trough as possible. Compared with the bottom of the support and the top of the conveyor trough, the high-speed planetary reduction mechanism is located in a larger space, which can improve the adaptability of the coal mining machine in the vertical and horizontal directions.

[0021] The present invention forms a relatively closed chamber by side plates, a fixed reduction box housing, a front hinge seat and a front hinge ear, and sets upper and lower cylindrical surface clearance fits at the mouth of the front hinge ear inserted into the fixed reduction box housing, so that the chamber where the oil cylinder is located is better sealed without affecting the swing of the boom housing, thereby effectively isolating 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, and improving the reliability of the oil cylinder operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an embodiment of a fixed reduction gearbox of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the connection between the high-speed planetary reduction mechanism and the second fixed-axis gear transmission mechanism;

[0024] Figure 3 A side view of a coal mining machine using the present invention;

[0025] Figure 4 It is a schematic diagram of the connection structure between the fixed reduction box housing and the bridge structure at the left connection ear;

[0026] Figure 5 It is a structural schematic diagram of the fixed reduction box housing and the bridge structure at the flat stop positioning connection;

[0027] Figure 6 A layout diagram of an embodiment of the pump speed increasing transmission system;

[0028] Figure 7 A detailed structural diagram of an embodiment of the speed increasing transmission system for the pump;

[0029] Figure 8 is a schematic diagram of the partial structure of the input end gear of the second fixed-axis gear transmission mechanism;

[0030] Fig. 9 is a structural schematic diagram of an embodiment of the end cover;

[0031] Fig.10 is a structural schematic diagram of an embodiment of the arm housing;

[0032] Fig.11 It is a schematic structural diagram of the hinged joint between the front support arm and the fixed reduction gearbox housing.

[0033] Reference numerals:

[0034] 1. Pump speed increasing transmission system; 11. Two-stage series planetary speed increasing mechanism; 111. Planet carrier of the first-stage planetary mechanism; 113. Internal gear ring of the first-stage planetary mechanism; 115. Sun gear of the second-stage planetary mechanism; 12. One-stage fixed axis gear speed increasing mechanism; 121. Head gear; 123. End gear; 13. Gear pump; 14. End cover; 141. Front of end cover; 142. Rear of end cover; 1421. Internal gear;

[0035] 2. Fixed reduction gearbox; 21. Fixed reduction gearbox housing; 211. Front hinge seat; 2113. Upper inner cylindrical surface; 2114. Lower inner cylindrical surface; 212. Rear hinge seat; 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; 24. First-stage 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. Internal gear ring of high-speed planetary reduction mechanism; 2623. Hollow shell; 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; 26311. Front groove; 26312. Rear groove; 1421. Internal gear; 29. ​​Side plate;

[0036] 31. Boom housing; 312. Front support arm; 3122. Cylinder connecting ear; 3123. Upper outer cylindrical surface; 3124. Lower outer cylindrical surface; 313. Rear support arm;

[0037] 4. Oil cylinder;

[0038] 6. Bridge structure; 61. Upper positioning boss; 62. Lower positioning boss; 63. Left connecting ear; 65. Left positioning pin;

[0039] 7. Cutting motor;

[0040] 91. Conveyor; 92. Support legs; 93. Support top beam. DETAILED DESCRIPTION

[0041] The present invention discloses a large torque output cutting transmission main body, such as Figure 1-11As shown, it includes a fixed reduction box 2, the fixed reduction box 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 first-stage planetary reduction mechanism 24, a central gear 25 and two groups of left and right large reduction ratio transmission mechanisms connected in sequence, and 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 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, 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 an external spline is provided on the output shaft of the cutting motor, and the external spline forms a spline connection with the internal spline of the core of the sun gear of the first-stage planetary reduction mechanism. The oil cylinder is located in front of the second fixed-axis gear transmission mechanism. The oil cylinder and the second fixed-axis gear transmission mechanism are located in different chambers.

[0042] 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.

[0043] The present invention arranges the oil cylinder which occupies a large space but is obviously lighter than the front-stage cutting transmission mechanism in front of the front-stage cutting transmission mechanism, so that the front-stage cutting transmission mechanism can be 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 to the mining side, thereby improving the stability of the coal mining machine in both the stationary state and the walking state.

[0044] Further, 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, and 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, and 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 both the left and right directions. 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 core part of the output end gear 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.

[0045] 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 1 ). 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] like Figure 3-5 As shown, the large torque output cutting transmission main body also includes a bridge structure 6, and the fixed reduction box housing and the bridge structure are arranged front and back and are detachably fixedly connected to each other. The specific connection structure is: the front end surface of the bridge structure is provided with an upper positioning boss 61 and a lower positioning boss 62 that are horizontally protruding forward and extending left and right, and a left connecting ear 63 and a right connecting ear that are located on the left and right sides of the upper and lower positioning bosses and extend forward horizontally. A positioning groove 216 that is horizontally concave forward and extends left and right is provided on the rear end surface of the fixed reduction box housing, and a left groove and a right groove are also provided on the left and right sides of the positioning groove, respectively, and a pin hole that passes through the fixed reduction box housing from top to bottom is provided in the left and right grooves. The upper plane of the upper positioning boss and the lower plane of the lower positioning boss form positioning matching surfaces with the upper groove wall 2161 and the lower groove wall 2162 of the positioning groove, respectively. The left connecting ear and the right connecting ear are respectively inserted into the left groove and the right groove, the ear hole of the left connecting ear and the pin hole of the left groove cooperate with the shaft hole of the left positioning pin 65 at the same time, and the ear hole of the right connecting ear and the pin hole of the right groove cooperate with the shaft hole of the right positioning pin at the same time.

[0050] 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 mine.

[0051] The upper positioning boss, the lower positioning boss and the positioning groove form a flat stop for positioning in the upper and lower directions. When positioned and connected, the supporting surface is longer and the stress condition is better. Combined with the pin positioning on the left and right sides, a reliable connection between the fixed reducer and the bridge structure can be achieved.

[0052] Part or all of the top surface of the bridge structure is preferably set as a slope with a high front and a low back. When the three machines are coordinated, sufficient clearance can be maintained between the coal mining machine body and the support top beam 93, thereby meeting the mining needs of undulating roof and floor plates, coal gangue, etc., and ensuring the smooth mining of extremely thin or thin coal seams in complex conditions such as coal rock.

[0053] The bridge structure includes an intermediate box body and a left connecting block and a right connecting block which are 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 ear and the right connecting ear are located on the left connecting block and the right connecting block, respectively. When the connecting ear on one side is damaged, it is only necessary to replace the connecting block on the corresponding side, and the intermediate box body can still work reliably and will not be scrapped due to the damage of the connecting ear on any side. Therefore, the service life is long and the maintenance cost is significantly reduced. The rear bottom surface of the intermediate box body is preferably set to a horizontal plane, and the rear part is flat as a whole, that is, the thickness in the up and down directions is small, at least much smaller than the front part, and even if a wider conveyor is used, the coal passing space will not be affected. When a wider conveyor is needed, the intermediate box body can be kept unchanged, and only the left and right connecting blocks and the corresponding connecting parts are replaced to achieve a longer production cycle.

[0054] The main body of the large torque output cutting transmission also includes a pump speed-increasing transmission system 1, which can replace the traditional pump motor to provide power for the gear pump of the hydraulic system on the coal mining machine. The pump speed-increasing transmission system includes a two-stage series planetary speed-increasing mechanism 11 and a first-stage fixed-axis gear speed-increasing mechanism 12 that are sequentially connected in transmission. The power input end and power output end of the two-stage series planetary speed-increasing mechanism are respectively the planet carrier 111 of the first-stage planetary mechanism and the sun gear 115 of the second-stage planetary mechanism. The power input end and power output end of the first-stage fixed-axis gear speed-increasing mechanism are respectively the head gear 121 and the end gear 123. The front end of the input end gear of the second fixed-axis gear transmission mechanism is provided with two stepped grooves with a larger front and a smaller rear. The inner gear ring 113 of the first-stage planetary mechanism is installed in the front groove 26311 and fixed relative to the fixed reduction box housing. The rear end of the planet carrier 111 of the first-stage planetary mechanism is provided with an external spline, which cooperates with the internal spline provided in the rear groove 26312 to form a spline connection. The core of the final gear is provided with an internal spline, which is used as a connection interface structure to connect the transmission shaft of the gear pump 13 of the hydraulic system. In the installed state, the hydraulic system and the oil cylinder will be located in the same chamber. When the input end gear of the second fixed axis gear transmission mechanism rotates, the internal spline in the rear groove also rotates synchronously, and the internal spline then drives the planet carrier of the first stage planetary mechanism to rotate, thereby realizing the power input to the first stage planetary mechanism.

[0055] The pump speed increasing transmission system draws out a power output branch from the input end gear of the second fixed axis gear transmission mechanism of the preceding cutting transmission mechanism, and transmits the corresponding power to the gear pump 13, so there is no need to separately equip the gear pump with an external power source.

[0056] The front-stage cutting transmission mechanism is a reduction transmission mechanism. The pump speed-increasing transmission system can be used to increase the speed of a certain node after deceleration, and finally increase the speed of the gear pump to the required speed to achieve the normal working state of the gear pump. The use of the two-stage series planetary speed-increasing mechanism can achieve a larger speed-increasing ratio with a smaller space occupation, which is very helpful to save installation space and make the system more compact.

[0057] The pump speed increasing transmission system also includes an end cover 14 fixed relative to the fixed reduction box housing, the shape of the end cover is a stepped shape with a larger front and a smaller rear, and the front part 141 and the rear part 142 of the end cover are respectively provided with a front chamber open in the front and a rear chamber open in the rear, and the front and rear chambers are connected. The rear part of the end cover is inserted into the front groove 26311, and is overlapped with the inner gear ring 113 of the first-stage planetary mechanism in front and back and positioned and connected through a circular stop and a positioning pin. The main body of the second-stage planetary mechanism is installed in the rear chamber of the end cover, and the rear part of the end cover is provided with an internal gear 1421. The rear part of the end cover acts as the inner gear ring of the second-stage planetary mechanism with the help of the internal gear, which is equivalent to the second-stage planetary mechanism also being arranged in the front groove of the input end gear of the second fixed axis gear transmission mechanism, which significantly saves axial installation space. The first-stage fixed-axis gear speed increasing mechanism 12 is installed in the front chamber of the end cover, and the output end of the sun gear 115 of the second-stage planetary mechanism is configured as an external spline, which extends forward and cooperates with the internal spline of the core of the head end gear 121 to form a spline connection.

[0058] The main body of the large torque output cutting transmission also includes a boom housing 31, and the free ends of the front support arm 312 and the rear support arm 313 of the boom housing 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 ears and the rear hinge ears, and the front pin 22 and the rear pin 23 are respectively passed through the two hinges. The front hinge seat and the rear hinge seat are both double-ear hinge seats, and an opening is provided on the side wall of the fixed reduction box housing between the two connecting ears of the front hinge seat. The free end of the front support arm is provided with a cylinder connecting ear 3122, and the cylinder connecting ear extends into the inner cavity of the fixed reduction box housing from the opening. One end of the cylinder 4 is hinged to the boom housing through the cylinder connecting ear, and the other end is hinged to the fixed reduction box housing. The telescopic movement of the cylinder drives the boom housing to swing along a fixed axis. Since the connecting ear of the oil cylinder is relatively close to the hinge axis between the boom housing and the fixed reduction box housing, the force arm that drives 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 oil cylinder and the front-stage cutting transmission mechanism are respectively located in different chambers, wherein the chamber where the oil cylinder is located is located at the frontmost side of the fixed reduction box housing. A side plate 29 is installed on the front side of the fixed reduction box housing, and the chamber where the oil cylinder is located is surrounded by the side plate, the fixed reduction box housing, the front articulated seat and the free end of the front support arm. 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's operation. Since the chamber where the oil cylinder is located is a cavity, arranging it at the frontmost side of the fixed reduction box housing makes room for installation further back for other structures, which is conducive to the center of gravity of the coal mining machine shifting toward the support leg or the conveyor shovel plate, thereby improving the stability of the coal mining machine.

[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 frame housing (see Fig.11), the upper plate and the lower plate are both part of the fixed reducer housing, for example, they can be the local extension of the top plate and the bottom plate of the fixed reducer 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 3123 and a lower outer cylindrical surface 3124 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 front and back directions in this paper correspond to Figure 1 Up and down direction.

Claims

1. A large torque output cutting transmission main body, characterized in that: It includes a fixed reduction box, which 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 first-stage planetary reduction mechanism, a central gear and left and right groups 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 sequentially from back to front, and 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. An external spline is provided on the output shaft of the cutting motor, and the external spline forms a spline connection with the internal spline of the core of the sun gear of the first-stage planetary reduction mechanism. The oil cylinder is located in front of the second fixed-axis gear transmission mechanism; the core of the planet carrier of the first-stage planetary reduction mechanism and the core of the central gear are each provided with an internal spline, and the planet carrier of the first-stage planetary reduction mechanism is connected to the sun gear. The central gear is 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 cores of the planet 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 planet 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 forward axially 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, 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, the side wall of the hollow shell is provided with an opening, and the hollow shell is fixedly installed in the fixed reduction box shell.

2. The large torque output cutting transmission main body 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 large torque output cutting transmission main body according to claim 1 or 2, characterized in that: It also includes a bridge structure, the front end surface of the bridge structure is provided with an upper positioning boss and a lower positioning boss which are horizontally protruding forward and extending left and right, and a left connecting ear and a right connecting ear which are located on the left and right sides of the upper and lower positioning bosses and extend horizontally forward; the rear end surface of the fixed reduction gearbox housing is provided with a positioning groove which is horizontally concave forward and extending left and right; the left and right sides of the positioning groove are also provided with a left groove and a right groove respectively, and the left and right grooves are each provided with a pin hole which passes through the fixed reduction gearbox housing up and down; the upper plane of the upper positioning boss and the lower plane of the lower positioning boss respectively form positioning matching surfaces with the upper groove wall and the lower groove wall of the positioning groove; the left connecting ear and the right connecting ear are respectively inserted into the left groove and the right groove; 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.

4. The large torque output cutting transmission main body according to claim 3, characterized in that: The bridge structure includes an intermediate box body and a left connecting block and a right connecting block which are detachably fixed on 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.

5. The large torque output cutting transmission main body according to claim 1 or 2, characterized in that: It also includes a pump speed-increasing transmission system, which includes a two-stage series planetary speed-increasing mechanism and a first-stage fixed-axis gear speed-increasing mechanism that are sequentially connected in transmission. The power input end and power output end of the two-stage series planetary speed-increasing mechanism are respectively the planetary carrier of the first-stage planetary mechanism and the sun gear of the second-stage planetary mechanism. The power input end and power output end of the first-stage fixed-axis gear speed-increasing mechanism are respectively the head gear and the terminal gear. The front end of the input end gear of the second fixed-axis gear transmission mechanism is provided with two stepped grooves with a larger front and a smaller rear. The inner gear ring of the first-stage planetary mechanism is installed in the front groove and is fixed relative to the fixed reduction box housing. The rear end of the planetary carrier of the first-stage planetary mechanism is set as an external spline, and the external spline cooperates with the internal spline set in the rear groove to form a spline connection.

6. The large torque output cutting transmission main body according to claim 5, characterized in that: The pump speed increasing transmission system also includes an end cover fixed relative to the fixed reduction box housing, the end cover having an outer shape of a step-shaped body with a larger front and a smaller rear. The front and rear parts of the end cover are respectively provided with a front chamber open in the front and a rear chamber open in the rear, the front and rear chambers are communicated with each other, the rear part of the end cover is inserted into the front groove, and is overlapped and fixedly connected with the inner gear ring of the first-stage planetary mechanism front and back, the main body of the second-stage planetary mechanism is installed in the rear chamber of the end cover, the rear part of the end cover is provided with an internal gear, and the rear part of the end cover serves as the inner gear ring of the second-stage planetary mechanism with the aid of the internal gear, the first-stage fixed-axis gear speed increasing mechanism is installed in the front chamber of the end cover, and the output end of the sun gear of the second-stage planetary mechanism is arranged as an external spline, which extends forward and cooperates with the internal spline of the core of the head gear to form a spline connection.

7. The large torque output cutting transmission main body according to claim 1 or 2, characterized in that: The cam is connected to the front and rear hinged seats of the fixed reduction gearbox housings by means of a front hinged ear and a rear hinged ear, respectively. The front hinged seat is a double-ear hinged seat, and an opening is provided on the side wall of the fixed reduction gearbox housing between the two connecting ears of the front hinged seat. The free end of the front support arm is provided with a cylinder connecting ear on the outside, and the cylinder connecting ear extends into the inner cavity of the fixed reduction gearbox housing from the opening. One end of the cylinder is hinged to the arm housing through the cylinder connecting ear, and the other end is hinged to the fixed reduction gearbox housing. The cylinder and the front-stage cutting transmission mechanism are respectively located in different chambers, wherein the chamber where the cylinder is located is located at the frontmost side of the fixed reduction gearbox housing, and a side plate is installed on the front side of the fixed reduction gearbox housing, and the chamber where the cylinder is located is surrounded by the side plate, the fixed reduction gearbox housing, the front hinged seat and the free end of the front support arm.

8. The large torque output cutting transmission main body according to claim 3, characterized in that: The cam is connected to the front and rear hinged seats of the fixed reduction gearbox housings by means of a front hinged ear and a rear hinged ear, respectively. The front hinged seat is a double-ear hinged seat, and an opening is provided on the side wall of the fixed reduction gearbox housing between the two connecting ears of the front hinged seat. The free end of the front support arm is provided with a cylinder connecting ear on the outside, and the cylinder connecting ear extends into the inner cavity of the fixed reduction gearbox housing from the opening. One end of the cylinder is hinged to the arm housing through the cylinder connecting ear, and the other end is hinged to the fixed reduction gearbox housing. The cylinder and the front-stage cutting transmission mechanism are respectively located in different chambers, wherein the chamber where the cylinder is located is located at the frontmost side of the fixed reduction gearbox housing, and a side plate is installed on the front side of the fixed reduction gearbox housing, and the chamber where the cylinder is located is surrounded by the side plate, the fixed reduction gearbox housing, the front hinged seat and the free end of the front support arm.

9. The large torque output cutting transmission main body according to claim 4, characterized in that: The cam is connected to the front and rear hinged seats of the fixed reduction gearbox housings by means of a front hinged ear and a rear hinged ear, respectively. The front hinged seat is a double-ear hinged seat, and an opening is provided on the side wall of the fixed reduction gearbox housing between the two connecting ears of the front hinged seat. The free end of the front support arm is provided with a cylinder connecting ear on the outside, and the cylinder connecting ear extends into the inner cavity of the fixed reduction gearbox housing from the opening. One end of the cylinder is hinged to the arm housing through the cylinder connecting ear, and the other end is hinged to the fixed reduction gearbox housing. The cylinder and the front-stage cutting transmission mechanism are respectively located in different chambers, wherein the chamber where the cylinder is located is located at the frontmost side of the fixed reduction gearbox housing, and a side plate is installed on the front side of the fixed reduction gearbox housing, and the chamber where the cylinder is located is surrounded by the side plate, the fixed reduction gearbox housing, the front hinged seat and the free end of the front support arm.

10. The large torque output cutting transmission main body according to claim 5, characterized in that: The cam is connected to the front and rear hinged seats of the fixed reduction gearbox housings by means of a front hinged ear and a rear hinged ear, respectively. The front hinged seat is a double-ear hinged seat, and an opening is provided on the side wall of the fixed reduction gearbox housing between the two connecting ears of the front hinged seat. The free end of the front support arm is provided with a cylinder connecting ear on the outside, and the cylinder connecting ear extends into the inner cavity of the fixed reduction gearbox housing from the opening. One end of the cylinder is hinged to the arm housing through the cylinder connecting ear, and the other end is hinged to the fixed reduction gearbox housing. The cylinder and the front-stage cutting transmission mechanism are respectively located in different chambers, wherein the chamber where the cylinder is located is located at the frontmost side of the fixed reduction gearbox housing, and a side plate is installed on the front side of the fixed reduction gearbox housing, and the chamber where the cylinder is located is surrounded by the side plate, the fixed reduction gearbox housing, the front hinged seat and the free end of the front support arm.

11. The large torque output cutting transmission main body according to claim 6, characterized in that: The cam is connected to the front and rear hinged seats of the fixed reduction gearbox housings by means of a front hinged ear and a rear hinged ear, respectively. The front hinged seat is a double-ear hinged seat, and an opening is provided on the side wall of the fixed reduction gearbox housing between the two connecting ears of the front hinged seat. The free end of the front support arm is provided with a cylinder connecting ear on the outside, and the cylinder connecting ear extends into the inner cavity of the fixed reduction gearbox housing from the opening. One end of the cylinder is hinged to the arm housing through the cylinder connecting ear, and the other end is hinged to the fixed reduction gearbox housing. The cylinder and the front-stage cutting transmission mechanism are respectively located in different chambers, wherein the chamber where the cylinder is located is located at the frontmost side of the fixed reduction gearbox housing, and a side plate is installed on the front side of the fixed reduction gearbox housing, and the chamber where the cylinder is located is surrounded by the side plate, the fixed reduction gearbox housing, the front hinged seat and the free end of the front support arm.

12. The large torque output cutting transmission main body according to claim 7, 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.

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