Thin seam shearer rocker arm and rocker arm support structure

Abstract

The present application relates to a kind of thin coal seam shearer rocker arm and rocker arm support structure, the swing arm shell of the main body of the rocker arm is left and right extension for installing cutting transmission mechanism arm support, connecting arm is connected in the middle part of arm support and extends forward, front arm and rear arm are provided on connecting arm, the high speed end of front arm, rear arm and arm support is mutually parallel and sequentially spaced from front to back, front arm and rear arm are respectively provided with front pin shaft mounting hole and rear pin shaft mounting hole coaxial with the input end gear of cutting transmission mechanism;The support structure includes main body part shell and rocker arm, the front part of main body part shell is respectively hinged with one rocker arm with one cutting motor as pin shaft, the output shaft of cutting motor is coaxially connected with the input end gear of cutting transmission mechanism on the same side of left and right, and the front arm of rocker arm is connected with the main body part shell between oil cylinder.The present application can provide larger mining range and cutting power and flexible oil cylinder installation mode, can adapt to the different stress state of drum inside and outside rotation.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of coal winning machine rocker arm and the height adjustment cylinder mounting structure of the rocker arm, especially applicable to thin coal seam coal winning machine, help to expand the mining range of thin coal seam coal winning machine, can be used in the mining of high hardness material. BACKGROUND

[0002] The cutting motor of the existing thin coal seam coal winning machine is generally located on the rocker arm, and swings with the swing of the rocker arm. When the rear rocker arm of the thin coal seam body-mounted coal winning machine cuts the upper cutter in the direction of travel, the problem of too small rear drum mining height may occur. When the mining height is increased, the rear rocker arm cutting motor will interfere with the upper coal table left after the front drum cuts the bottom cutter, so the overall mining height of this coal winning machine is too narrow, and it cannot adapt to the mining requirements of the large thickness variation of the working face in China's thin coal seam.

[0003] In view of the above problems, the industry has proposed to divide the cutting part into a swing part and a fixed part, and to set the cutting motor and the main part of the cutting transmission system in the fixed part, resulting in a too complex structure of the fixed part, a longer length and a larger weight of the body suspension section, and a still large influence of the center of gravity of the whole machine on the stress of the whole machine.

[0004] At the same time, due to the thin body and the compact cavity space, the diameter of the oil cylinder cannot be set too large, the cutting reaction force of the drum requires high hydraulic pressure of the oil cylinder, and the rotation direction of the drum is different during cutting, so the stress on the oil cylinder is also very different, especially when cutting high-hardness materials. The existing oil cylinder mounting method generally determines a direction when designed, mainly considering factors such as material accumulation and structural space, without considering left and right and reverse installation. When hard material mining is encountered, overload pressure protection may occur, and when the outer rotating drum is running, problems such as overall floating may occur when the cutting force is too large and the traction speed is too high. SUMMARY

[0005] The present application aims to provide a thin coal seam coal winning machine rocker arm and a rocker arm support structure that can provide a larger mining range, a larger cutting power and a more flexible oil cylinder mounting method, can adapt to different stress states of the inner and outer rotation of the drum, and also help to shorten the body.

[0006] The main technical solutions of the present application are:

[0007] A thin coal seam shearer swing arm, comprising a swing arm shell, a main body of the swing arm shell being a left and right extending arm support, a cutting transmission mechanism being installed in the arm support, an input end gear and an output end gear of the cutting transmission mechanism being located at the high speed end and the low speed end of the arm support respectively, a connecting arm being provided in the middle of the arm support and suspending from the arm support to the front, a front arm and a rear arm being provided on the connecting arm and suspending from the connecting arm to the left or to the right, the front arm, the rear arm and the high speed end of the arm support being parallel to each other and being arranged in sequence from front to back, a front pin shaft mounting hole and a rear pin shaft mounting hole being provided on the front arm and the rear arm respectively for realizing the hinging of the thin coal seam shearer swing arm with the shearer body, a joint bearing being further installed in the front pin shaft mounting hole and the rear pin shaft mounting hole, an outer ring of the joint bearing being fixed relative to the front arm and the rear arm, and the front pin shaft mounting hole and the rear pin shaft mounting hole being coaxial with the input end gear of the cutting transmission mechanism.

[0008] The connecting arm is a flat and thin structure with a left and right width being less than an upper and lower height, and a top surface of the connecting arm is a slope, and the closer to the high speed end of the arm support the top surface of the connecting arm is, the higher the top surface is.

[0009] A thin coal seam shearer swing arm support structure, comprising a main body shell, two left and right oil cylinders, two left and right cutting motors and the thin coal seam shearer swing arm of claim 1 or 2, the front part of the main body shell being provided with a first ear seat, a second ear seat and a third ear seat in sequence from front to back at the left and right ends respectively, a front groove being formed between the first ear seat and the second ear seat, a middle groove being formed between the second ear seat and the third ear seat, and a rear groove being formed between the third ear seat and the rear part of the main body shell, the front arm, the rear arm and the high speed end of the arm support on the same swing arm shell being inserted into the front groove, the middle groove and the rear groove on the same side, each cutting motor being installed as a hinging shaft in an inner hole formed by the ear hole of the first ear seat, the front pin shaft mounting hole, the ear hole of the second ear seat, the rear pin shaft mounting hole and the ear hole of the third ear seat on the same side and coaxial, an output shaft of the cutting motor being coaxially and drivingly connected with the input end gear of the cutting transmission mechanism on the same side, and the oil cylinders being hinged between the front arms of the two left and right shearer swing arms and the left and right ends of the main body shell respectively.

[0010] An outer surface of the suspending end of the front arm is provided as an outer convex circular arc cylindrical surface coaxial with the front pin shaft mounting hole, a groove bottom of the corresponding front groove is provided as an open structure communicating with an inner cavity of the main body shell, top and bottom edges of the opening are provided as inner concave circular arc cylindrical surfaces coaxial with the ear hole of the second ear seat, and the outer surface of the suspending end of the front arm is coaxially and slidingly fitted with the top and bottom edges.

[0011] The outer surface of the high-speed end of the rear arm and the arm support on the same swing arm shell is provided as a convex circular cylindrical surface coaxial with the front pin shaft mounting hole, the bottom surface of the middle groove and the rear groove is provided as a concave circular cylindrical surface coaxial with the ear hole of the second ear seat, and the outer surface of the high-speed end of the rear arm and the arm support is spaced apart from the middle groove and the rear groove respectively.

[0012] The side surface of the connecting arm near the low-speed end of the arm support is provided as a concave circular cylindrical surface coaxial with the output gear of the cutting transmission mechanism.

[0013] The outer surface of the overhanging end of the first ear seat, the second ear seat and the third ear seat is provided as a convex circular cylindrical surface coaxial with the ear hole of the second ear seat, the side surface of the connecting arm near the high-speed end of the arm support is provided as a concave circular cylindrical surface, and the outer surface of the overhanging end of the first ear seat, the second ear seat and the third ear seat is spaced apart from the side surface of the corresponding connecting arm near the high-speed end of the arm support.

[0014] A cover plate is mounted at the front end opening of the main body shell, the front arm, the main body shell, the cutting motor and the cover plate form a closed oil cylinder mounting cavity, and the left and right oil cylinders are arranged in the oil cylinder mounting cavity, one end of the left and right oil cylinders is respectively hinged to the oil cylinder hinge seat on the overhanging end of the left and right front arms, and the other end of the oil cylinder is hinged to the main body shell.

[0015] The oil cylinder hinge seat on the overhanging end of the front arm has two upper and lower oil cylinder hinge seats, and one hinge seat is respectively arranged in the middle of the top plate and the bottom plate of the main body shell, and one or two hinge mounting positions are arranged on the hinge seat, when one hinge mounting position is arranged on the hinge seat, one end of the left and right oil cylinders is hinged to the lower oil cylinder hinge seat or the upper oil cylinder hinge seat, and the other end of the left and right oil cylinders is respectively hinged to the hinge seat on the top plate or the hinge seat on the bottom plate, so that the left and right oil cylinders form an inverted V shape or a V shape, when two hinge mounting positions are arranged on the hinge seat, one end of the left and right oil cylinders is hinged to the lower oil cylinder hinge seat and the upper oil cylinder hinge seat respectively, and the other end of the left and right oil cylinders is hinged to the hinge seat on the top plate and the hinge seat on the bottom plate respectively, and the other end of the two oil cylinders is connected to the hinge mounting positions on the left and right sides, so that the left and right oil cylinders are parallel.

[0016] The left and right oil cylinders are single-rod piston cylinders, and the overhanging end of the piston rod is hinged to the overhanging end of the front arm.

[0017] The front part of the main body shell is a multi-chamber thin-walled frame structure, and the rear part of the main body shell is a solid structure.

[0018] The beneficial effects of the present application are:

[0019] The present application can use cutting motor as the pin shaft to be connected with the machine body of the coal mining machine, which shortens the length of the left and right of the machine body of the coal mining machine and simplifies the structure of the cutting mechanism.

[0020] The connecting arm with special structure has little influence on the coal table above during the up and down swinging of the swinging arm shell, and finally makes the mining range of the whole swinging arm very large.

[0021] The present application adopts the specific structure design that the high-speed end of the forearm, the rear arm and the arm support are arranged in sequence from front to back, the forearm and the rear arm are the stress positions, the high-speed end of the arm support is the non-stress position, the stress position and the non-stress position are separated, which can ensure that the transmission part located in the arm support is in a good non-stress state, thus helping to improve the transmission accuracy.

[0022] The joint bearing is installed in the pin shaft mounting hole of the forearm and the rear arm, and the cutting motor is supported by the joint bearing, which can maintain the concentricity between the respective pin shaft mounting hole and the shell of the cutting motor, and improve the transmission accuracy between the cutting motor and the cutting transmission mechanism.

[0023] The side surface of the connecting arm close to the low-speed end of the arm support is arranged as a concave circular arc cylindrical surface coaxial with the output gear of the cutting transmission mechanism, and a certain gap is maintained between the concave circular arc cylindrical surface and the drum blade, which can improve the loading effect of the drum screw conveyor.

[0024] The outer surface of the overhanging end of the rear arm and the outer surface of the high-speed end of the arm support are arranged as convex circular arc cylindrical surfaces coaxial with the front pin shaft mounting hole, and when the corresponding edge of the machine body of the coal mining machine is arranged as a concave circular arc cylindrical surface coaxial with the front pin shaft mounting hole, by controlling the gap width between the convex circular arc cylindrical surface and the corresponding concave circular arc cylindrical surface within a suitable range, the accumulation of coal and rock into the swinging arm shell and the machine body can be effectively controlled during the rotation of the swinging arm shell relative to the machine body.

[0025] The side surface of the connecting arm close to the high-speed end of the arm support is arranged as a concave circular arc cylindrical surface coaxial with the front pin shaft mounting hole. The outer surface of the overhanging end of the corresponding lug seat on the machine body of the coal mining machine can be arranged as a convex circular arc cylindrical surface coaxial with the front pin shaft mounting hole, and by controlling the gap width between the concave circular arc cylindrical surface and the corresponding convex circular arc cylindrical surface within a suitable range, the accumulation of coal and rock into the swinging arm shell and the machine body can be effectively controlled during the rotation of the swinging arm shell relative to the machine body.

[0026] The outer surface of the overhanging end of the forearm is provided as an outer convex circular arc cylindrical surface coaxial with the front pin shaft mounting hole, the groove bottom of the corresponding front recess is provided as an opening structure communicating with an inner cavity of the main body part shell, the top and bottom edges of the opening are provided as inner concave circular arc cylindrical surfaces coaxial with the ear hole of the second ear seat, the outer surface of the overhanging end of the forearm is coaxially slidingly fitted with the top and bottom edges, while ensuring the relative swinging between the swing arm and the main body part shell, the cleanliness of the inner cavity of the main body part shell communicating with the above opening structure can also be maintained.

[0027] The forearm, the main body part shell, the cutting motor and the cover plate surround to form a closed oil cylinder mounting cavity, so as to provide a clean working space for the oil cylinder, ensure that the swing arm is not affected by coal and other mining materials during the swinging process with the oil cylinder, and provide a guarantee for the normal swinging of the swing arm between the highest and lowest limit swing angle positions, and finally ensure that the maximum mining range is not affected.

[0028] One end of the left and right two oil cylinders is respectively hinged to the oil cylinder hinge seat located on the overhanging end of the left and right two forearms, the other end of the oil cylinder can be all hinged to the hinge seat located on the top plate of the main body part shell, all hinged to the hinge seat located on the bottom plate of the main body part shell, or respectively hinged to the hinge seats located on the top plate and the bottom plate of the main body part shell. When the oil cylinder is installed in the above different installation modes, the two oil cylinders can form a V-shaped, inverted V-shaped or approximately parallel inclined state. According to the different rotation directions of the drum, the oil cylinder can be flexibly replaced in the above different installation modes to adapt to the different stress states of the drum rotating inward or outward, and avoid the problem of the whole drum floating upward due to excessive cutting force and high traction speed. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a front view of an embodiment of the swing arm support structure of the application;

[0030] Figure 2 It is a front view of an embodiment of the swing arm support structure of the application; Figure 1 It is a top view of the swing arm shell in

[0031] Figure 3 It is a front view of an embodiment of the swing arm support structure of the application; Figure 1 It is a front view of an embodiment of the swing arm support structure of the application;

[0032] Figure 4 It is a front view of an embodiment of the swing arm support structure of the application; Figure 3 It is a front view of an embodiment of the swing arm support structure of the application;

[0033] Figure 5 It is a schematic view of the first installation structure of the oil cylinder;

[0034] Figure 6 It is a schematic view of the second installation structure of the oil cylinder;

[0035] Figure 7 It is a schematic view of the third installation structure of the oil cylinder.

[0036] Figure label:

[0037] 1. Rocker arm; 11. Swing arm housing; 111. Forearm; 1110. Hydraulic cylinder hinge seat; 1110'. Hydraulic cylinder hinge seat; 1111. Outer surface of the cantilever end of the forearm; 1112. Front pin mounting hole; 112. Rear arm; 1121. Outer surface of the cantilever end of the rear arm; 1122. Rear pin mounting hole; 113. Boom; 1131. Outer surface of the high-speed end of the boom; 114. Connecting arm; 1141. Side near the high-speed end of the boom; 1142. Side near the low-speed end of the boom; 12. Cutting transmission mechanism; 121. Input end gear; 122. Planetary reduction mechanism; 13. Roller; 14. Spherical bearing;

[0038] 2. Main body shell; 210. Hinge seat; 210'. Hinge seat; 22. Hydraulic cylinder mounting cavity; 23. Cover plate;

[0039] 3. Cut the motor;

[0040] 4. Hydraulic cylinder; 41. Left hydraulic cylinder; 42. Right hydraulic cylinder. Detailed Implementation

[0041] This invention discloses a rocker arm 1 (which may be simply referred to as a rocker arm) for a thin coal seam mining machine, such as... Figures 1-7 As shown, the boom includes a swing arm housing 11, the main body of which is a boom 113 extending left and right. A cutting transmission mechanism 12 is installed inside the boom. The cutting transmission mechanism adopts a fixed-axis gear transmission mechanism. To easily distinguish the two ends of the boom, the ends where the input gear 121 (also the high-speed gear) and the output gear (also the low-speed gear) of the cutting transmission mechanism are located are respectively regarded as the high-speed end and the low-speed end of the boom. A connecting arm 114 extending forward from the boom is provided in the middle of the boom. A front arm 111 and a rear arm 112 extending to the left or right from the connecting arm are provided on the connecting arm. The front arm, rear arm and the high-speed end of the boom are parallel to each other and arranged alternately from front to back. That is, for the right swing arm housing of the coal mining machine, the front arm and rear arm extend to the left from the connecting arm; for the left swing arm housing of the coal mining machine, the front arm and rear arm extend to the right from the connecting arm. The forearm and rear arm are respectively provided with a front pin mounting hole 1112 and a rear pin mounting hole 1122 for mounting the cutting motor as a pin. A spherical plain bearing 14 is also installed in the front and rear pin mounting holes. The outer ring of the spherical plain bearing is fixed relative to the forearm and rear arm, for example, by a tight fit or by a key connection. The spherical plain bearing supports the cutting motor, allowing the forearm and rear arm to rotate relative to it. Both the front and rear pin mounting holes are coaxial with the input gear of the cutting transmission mechanism, ensuring that the installed cutting motor transmits power coaxially with the input gear.

[0042] The swing arm is hinged with the shearer body through the forearm, the rear arm and the cutting motor, which shortens the left and right lengths of the shearer body section and simplifies the structure of the cutting mechanism.

[0043] The connecting arm is a flat structure with the left and right widths smaller than the up and down heights, and the top surface of the connecting arm is an inclined surface, and the top surface of the connecting arm in the left and right directions is higher closer to the high-speed end of the arm support.

[0044] The application discloses a thin coal seam shearer swing arm supporting structure, which comprises a main body shell 2, two left and right oil cylinders 4, two left and right cutting motors 3 and the thin coal seam shearer swing arm, the left and right ends of the front part of the main body shell are respectively provided with a first ear seat, a second ear seat and a third ear seat from front to back, a front groove is formed between the first ear seat and the second ear seat, a middle groove is formed between the second ear seat and the third ear seat, a rear groove is formed between the third ear seat and the rear part of the main body shell, the front arm, the rear arm and the high-speed end of the arm support on the same swing arm shell are correspondingly inserted into the front groove, the middle groove and the rear groove located on the same side, each cutting motor is installed in the inner hole formed by the ear hole of the first ear seat, the front pin shaft mounting hole, the ear hole of the second ear seat, the rear pin shaft mounting hole and the ear hole of the third ear seat on the same side and coaxially, the output shaft of the cutting motor is coaxially and transmissionally connected with the input end gear 121 of the cutting transmission mechanism located on the same side, and the oil cylinders are respectively hinged between the front arms of the two left and right shearer swing arms and the left and right ends of the main body shell.

[0045] The shearer drum 13 and the planetary reduction mechanism 122 are both installed on the low-speed end of the arm support, and the planetary reduction mechanism is located in the core of the drum. The planetary reduction mechanism bears most of the reduction work, so that the cutting transmission mechanism as a front-stage reduction part can meet the reduction requirement by adopting a relatively simple fixed shaft gear transmission mechanism, and correspondingly, the outer shape of the arm support for accommodating the cutting transmission mechanism is more regular.

[0046] The external load force borne by the drum is transmitted to the main body shell through the connecting arm, the forearm and the rear arm. The forearm and the rear arm are force receiving parts, and the high-speed end of the arm support is a non-force receiving part, so that the transmission part located in the arm support is in a good non-force receiving state, thereby helping to improve the transmission accuracy.

[0047] The outer surface 1111 of the overhanging end of the front arm is preferably designed as an outer convex circular arc cylindrical surface coaxial with the front pin shaft mounting hole, and the groove bottom of the corresponding front groove is designed as an opening structure communicating with an inner cavity of the main body shell, and the top and bottom edges of the opening are designed as inner concave circular arc cylindrical surfaces coaxial with the ear hole of the second ear seat, and the outer surface 1111 of the overhanging end of the front arm is coaxially slidingly fitted with the top and bottom edges. The above structure design of the front arm and the front groove can ensure the relative swinging between the rocker arm and the main body shell, and also keep the inner cavity of the main body shell communicating with the above opening structure clean.

[0048] The outer surface 1131 of the high-speed end of the rear arm and the arm support on the same swing arm shell is designed as an outer convex circular arc cylindrical surface coaxial with the front pin shaft mounting hole, and the groove bottom surface of the corresponding middle groove and rear groove is designed as an inner concave circular arc cylindrical surface coaxial with the ear hole of the second ear seat, and the outer surface 1121 of the overhanging end of the rear arm and the outer surface 1131 of the high-speed end of the arm support are respectively spaced from the middle groove and the rear groove. By controlling the gap width between the outer convex circular arc cylindrical surface and the corresponding inner concave circular arc cylindrical surface within a suitable range, the accumulation of coal and rock into the swing arm and the machine body during the rotation of the swing arm relative to the machine body can be effectively controlled.

[0049] The side surface 1142 of the connecting arm near the low-speed end of the arm support is designed as an inner concave circular arc cylindrical surface coaxial with the output gear of the cutting transmission mechanism. The inner concave circular arc cylindrical surface can maintain a certain gap with the drum blade, thereby improving the loading effect of the drum screw conveyor.

[0050] The outer surface of the overhanging end of the first ear seat, the second ear seat and the third ear seat is designed as an outer convex circular arc cylindrical surface coaxial with the ear hole of the second ear seat, and the side surface 1141 of the connecting arm near the high-speed end of the arm support is designed as an inner concave circular arc cylindrical surface. The outer surface of the overhanging end of the first ear seat, the second ear seat and the third ear seat is spaced from the side surface of the connecting arm near the high-speed end of the arm support. By controlling the gap width between the inner concave circular arc cylindrical surface and the corresponding outer convex circular arc cylindrical surface within a suitable range, the accumulation of coal and rock into the swing arm and the main body shell during the rotation of the swing arm relative to the main body shell can be effectively controlled.

[0051] A cover plate 23 is installed at the front open end of the main body shell, and the front arm, the main body shell, the cutting motor and the cover plate form a closed oil cylinder mounting cavity 22, which provides a clean working space for the oil cylinder, ensures that the swing arm is not affected by coal and other mining materials during the swinging process caused by the extension and retraction of the oil cylinder, and provides a guarantee for the normal swinging of the swing arm between the highest and lowest limit swing angle positions, and finally ensures that the maximum mining range is not affected. Both oil cylinders are arranged in the oil cylinder mounting cavity.

[0052] The two oil cylinder hinge seats on the overhanging end of the forearm are 1110' and 1110. The two hinge seats 210' and 210 are respectively arranged in the middle of the top plate and the bottom plate of the oil cylinder installation cavity of the main body shell. The hinge seats are provided with one or two symmetrically arranged hinge installation positions.

[0053] As shown in Figure 6 , 7 when the hinge seat is provided with one hinge installation position in the middle, one end of the two oil cylinders 41 and 42 is hingedly connected to the lower oil cylinder hinge seat or the upper oil cylinder hinge seat, and the other end of the two oil cylinders is hingedly connected to the hinge seat on the top plate or the hinge seat on the bottom plate, so that the two oil cylinders form an inverted V shape (see Figure 6 ) or a V shape (see Figure 7 ).

[0054] As shown in Figure 5 , when the hinge seat is provided with two symmetrically arranged hinge installation positions, one end of the two oil cylinders 41 and 42 is hingedly connected to the lower oil cylinder hinge seat, and the other end is hingedly connected to the upper oil cylinder hinge seat. Correspondingly, one end of the two oil cylinders is hingedly connected to the hinge seat on the top plate, and the other end is hingedly connected to the hinge seat on the bottom plate. The other end of the two oil cylinders is connected to the hinge installation positions on the left and right sides, respectively, and the two oil cylinders are arranged in a nearly parallel inclined state.

[0055] According to the different rotation directions of the drum, the oil cylinder can be flexibly replaced in the above-mentioned installation mode to adapt to different stress states of the drum in the inner rotation or outer rotation.

[0056] When the two oil cylinders are installed in a nearly parallel inclined state, the left and right lengths of the front part of the main body shell can be further shortened.

[0057] The two oil cylinders are single-rod piston cylinders, and the overhanging end of the piston rod is hingedly connected to the overhanging end of the forearm. When the oil cylinders drive the two swing arms to swing, the large cavity of the oil cylinder is in the middle position, and the small cavity is on the left and right sides. The cutting reaction force is mainly borne by the large cavity of the oil cylinder. No matter the drum is in the inner rotation or outer rotation state, the stress is better, especially when the single-direction mining is carried out.

[0058] The front part of the main body shell is a multi-chamber thin-walled frame structure, and the left and right parts of the rear part of the main body shell are solid structures. In combination with the shorter left and right lengths of the front part of the main body shell, i.e., the overhanging body section, the center of gravity of the coal mining machine can be moved backward, and the stability of the whole machine can be improved.

[0059] Unless otherwise specified, the front and back directions in this article refer to the directions close to the coal wall and away from the coal wall, respectively.

Claims

1. A rocker arm support structure for a thin coal seam mining machine, characterized in that: The system includes a main body housing, two hydraulic cylinders (left and right), two cutting motors (left and right), and a rocker arm for a thin coal seam mining machine. The rocker arm includes a swing arm housing, the main body of which is a boom extending laterally. A cutting transmission mechanism is installed inside the boom. The input and output gears of the cutting transmission mechanism serve as the high-speed and low-speed ends of the boom, respectively. A connecting arm extends forward from the middle of the boom. A forearm and a rear arm extend to the left or right from the connecting arm. The forearm, rear arm, and the high-speed end of the boom are parallel to each other and arranged alternately from front to back. The forearm and rear arm each have a front pin mounting hole and a rear pin mounting hole for hinged connection between the rocker arm and the machine body. A spherical bearing is also installed in the front and rear pin mounting holes, with the outer ring of the bearing fixed relative to the forearm and rear arm. Both the front and rear pin mounting holes... The cutting transmission mechanism's input gear is coaxial with the main body housing. The front and left ends of the main body housing are each provided with a first ear seat, a second ear seat, and a third ear seat sequentially from front to back. A front groove is formed between the first and second ear seats, a middle groove is formed between the second and third ear seats, and a rear groove is formed between the third ear seat and the rear of the main body housing. The high-speed ends of the forearm, rear arm, and boom on the same swing arm housing are correspondingly inserted into the front, middle, and rear grooves located on the same left and right sides. Each cutting motor is installed as a hinge shaft in the inner hole formed by the ear holes of the first ear seat, the front pin mounting hole, the second ear seat, the rear pin mounting hole, and the third ear seat, all coaxial and on the same left and right sides. The output shaft of the cutting motor is coaxially connected to the input gear of the cutting transmission mechanism located on the same side. The hydraulic cylinders are respectively hinged between the forearms of the left and right coal mining machine rocker arms and the left and right ends of the main body housing.

2. The rocker arm support structure for a thin coal seam mining machine as described in claim 1, characterized in that: The outer surface of the cantilever end of the forearm is configured as a convex arc cylindrical surface coaxial with the front pin mounting hole. The bottom of the corresponding front groove is configured as an opening structure communicating with an inner cavity of the main body housing. The top and bottom edges of the opening are both configured as concave arc cylindrical surfaces coaxial with the ear hole of the second ear seat. The outer surface of the cantilever end of the forearm slides coaxially with the top and bottom edges.

3. The rocker arm support structure for a thin coal seam mining machine as described in claim 2, characterized in that: The outer surfaces of the high-speed ends of the rear arm and boom on the same swing arm housing are all configured as convex arc cylindrical surfaces coaxial with the front pin mounting hole. Correspondingly, the bottom surfaces of the middle groove and the rear groove are all configured as concave arc cylindrical surfaces coaxial with the ear hole of the second ear seat. The outer surfaces of the high-speed ends of the rear arm and boom are respectively spaced from the middle groove and the rear groove.

4. The rocker arm support structure for a thin coal seam mining machine as described in claim 3, characterized in that: The side of the connecting arm near the low-speed end of the boom is configured as a concave arc cylindrical surface, and this concave arc cylindrical surface is coaxial with the output gear of the cutting transmission mechanism.

5. The rocker arm support structure for a thin coal seam mining machine as described in claim 4, characterized in that: The outer surface of the overhanging end of the first ear seat, the second ear seat and the third ear seat is configured as an outwardly convex arc cylindrical surface coaxial with the ear hole of the second ear seat. The side of the connecting arm near the high-speed end of the boom is configured as an inwardly concave arc cylindrical surface. There is a gap between the outer surface of the overhanging end of the first ear seat, the second ear seat and the third ear seat and the side of the corresponding connecting arm near the high-speed end of the boom.

6. The rocker arm support structure for a thin coal seam mining machine as described in claims 1, 2, 3, 4, or 5, characterized in that: A cover plate is installed at the front opening of the main body housing. The forearm, the main body housing, the cutting motor and the cover plate form a closed cylinder mounting cavity. Both left and right cylinders are set in the cylinder mounting cavity. One end of each of the left and right cylinders is hinged to a cylinder hinge seat located on the cantilever end of the left and right forearms, and the other end of each cylinder is hinged to the main body housing.

7. The rocker arm support structure for a thin coal seam mining machine as described in claim 6, characterized in that: The forearm has two hydraulic cylinder hinge seats, one upper and one lower. A hinge seat is located centered on the left and right sides of the top and bottom plates of the main body housing, within the hydraulic cylinder mounting cavity. Each hinge seat has either one central hinge position or two symmetrical hinge mounting positions. When the hinge seat has one central hinge mounting position, one end of each of the two hydraulic cylinders is hinged to the lower or upper hydraulic cylinder hinge seat. Correspondingly, the other ends of both hydraulic cylinders are hinged to the hinge seats located on the top plate or both are hinged to... On the hinge seat located on the base plate, the left and right cylinders form an inverted V or V shape; when the hinge seat has two symmetrical hinge mounting positions, one end of the left and right cylinders is hinged to the lower cylinder hinge seat and the other end is hinged to the upper cylinder hinge seat. Correspondingly, the other end of the left and right cylinders is hinged to the hinge seat located on the top plate and the other end is hinged to the hinge seat located on the base plate. The hinge mounting positions connected to the other ends of the two cylinders are on opposite sides, and the left and right cylinders are parallel.

8. The rocker arm support structure for a thin coal seam mining machine as described in claim 7, characterized in that: The two cylinders on the left and right are single-rod piston cylinders, with the extended end of the piston rod hinged to the extended end of the forearm.

9. The rocker arm support structure for a thin coal seam mining machine as described in claim 6, characterized in that: The front part of the main body shell is a multi-chamber thin-walled frame structure, while the left and right parts of the rear part of the main body shell are solid structures.

10. The rocker arm support structure for a thin coal seam mining machine as described in claims 1, 2, 3, 4, or 5, characterized in that: The connecting arm is a thin, flat structure with a width smaller than its height, and the top surface of the connecting arm is sloping. In the left-right direction, the top surface of the connecting arm is higher as it approaches the high-speed end of the boom.

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