Thin seam short span mining machine swing arm and swing arm support structure

Abstract

The invention relates to a thin seam short span mining machine swing arm and swing arm support structure, the main body of the swing arm shell of the swing arm is a left and right extending arm support, a forward extending connecting arm is connected to the middle of the arm support, a front arm is arranged on the connecting arm, the front arm is located in front of the high speed end of the arm support, the front arm, the front part of the high speed end of the arm support and the rear part of the high speed end of the arm support are respectively provided with coaxial front and rear pin shaft mounting holes and input end gear of the cutting transmission mechanism; the support structure comprises a front main body part shell, a swing arm, a cutting motor and a height adjusting oil cylinder, the left and right ends of the front main body part shell are respectively hinged with one swing arm with a cutting motor as a pin shaft, the output shaft of the cutting motor is coaxially connected with the input end gear of the same side, the front arm of the swing arm is hinged with the front main body part shell with the height adjusting oil cylinder. The invention has compact structure, can provide larger mining range, realize shorter machine body length and relatively clean oil cylinder installation space.

Description

Technical Field

[0001] This invention relates to a swing arm for a coal mining machine and a height adjustment cylinder mounting structure for the swing arm, which is particularly suitable for thin coal seam mining machines. It helps to expand the mining range of thin coal seam mining machines, shorten the machine body length, and improve the center of gravity problem of the suspended machine body. Background Technology

[0002] In existing thin coal seam mining machines, the cutting motor is usually located on the swing arm and swings with the swing arm. When the rear swing arm of this type of thin coal seam suspended body mining machine is cutting the upper cutter in the direction of travel, the problem of insufficient rear drum mining height occurs. This is because if the mining height is increased further, the cutting motor of the rear swing arm will interfere with the upper coal platform left behind the bottom cutter of the front drum. Therefore, the overall mining height of this type of mining machine is too narrow and cannot meet the mining requirements of thin coal seam working faces with large variations in ore thickness in my country.

[0003] In response to the above problems, the industry has proposed to divide the cutting part into a swinging part and a fixed part, and to set the main body of the cutting motor and cutting transmission system in the fixed part. However, this has resulted in an overly complex structure in the fixed part, with the left and right lengths of the overhanging section of the machine body being too long and the weight being too heavy. The problem of the center of gravity of the whole machine still has a significant impact on the stress on the whole machine.

[0004] Meanwhile, because the existing support cylinders are installed in an open space, coal and rock accumulate above and below them during operation. In particular, the accumulation of coal and rock between the support cylinders and the coal mining machine casing restricts the cylinder's movement, resulting in the mining height falling short of theoretical requirements, and in some cases, even causing the cylinders to break. Furthermore, the current method of placing cylinders in the longitudinal direction on the left and right sides of the coal mining machine further lengthens the machine body, exacerbating the problem of the suspended body's center of gravity shifting towards the coal face. Summary of the Invention

[0005] The present invention aims to provide a swing arm and swing arm support structure for a short-span coal mining machine for thin coal seams. The structure is compact, providing a large mining range and achieving a shorter machine body length as well as relatively clean cylinder installation space.

[0006] The main technical solutions of this invention are as follows:

[0007] A swing arm for a thin coal seam mining machine includes a swing arm housing. The main body of the swing arm housing 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 extending forward from the boom is located in the middle of the boom. A forearm extending to the left or right from the connecting arm is provided on the connecting arm. The forearm is located in front of the high-speed end of the boom. The front parts of the forearm and the high-speed end of the boom are respectively provided with functions for achieving… The swing arm of the thin coal seam short span coal mining machine is hinged to the coal mining machine body with front and rear pin mounting holes. The input end gear is installed at the rear of the high-speed end of the boom. Both the front and rear pin mounting holes are coaxial with the input end gear. The lower part of the connecting arm is provided with a cylinder receiving cavity that extends left and right and opens downward. In the front-back direction, the cylinder receiving cavity is located below the forearm. The front and rear cavity walls of the cylinder receiving cavity are provided with a pair of coaxial cylinder outer pin holes, and the axis of the cylinder outer pin holes extends front and back.

[0008] The connecting arm is narrowest in the upper middle part in the height direction, and becomes wider in the left and right directions as it approaches the upper and lower ends. The top surface of the connecting arm is a slope, and the end closer to the high-speed end of the boom is higher in the left and right direction.

[0009] The side of the connecting arm near the low-speed end of the boom in the left-right direction is preferably configured as a concave arc cylindrical surface coaxial with the output gear.

[0010] The connecting arm has an inner cavity that communicates with the inner cavity of the boom, and an enhanced cooler is provided in the inner cavity of the connecting arm.

[0011] A window may be provided on the front wall of the cylinder receiving cavity.

[0012] A swing arm support structure for a thin coal seam short-span coal mining machine includes a front main body shell, a height adjustment cylinder, a cutting motor, and the swing arm. The right or left edge of the front main body shell is provided with a first lug, a second lug, and a connecting base sequentially from front to back. A front groove is formed between the first and second lugs, and a rear groove is formed between the second lug and the connecting base. The high-speed ends of the forearm and boom are respectively inserted into the front and rear grooves. The cutting motor is installed as a hinge pin in an inner hole formed by the lug holes of the first lug, the front pin mounting hole, the second lug, and the rear pin mounting hole. The output shaft of the cutting motor is coaxially connected to the input gear. The cutting motor is fixedly connected and rotatably connected to both the front main body shell and the swing arm shell. The height adjustment cylinder is located within a cylinder receiving cavity. One end of the height adjustment cylinder is hinged to an outer pin, which is installed in the outer pin hole of the cylinder. The other end of the height adjustment cylinder is hinged to the front main body shell.

[0013] The top surface of the cylinder receiving cavity is a concave arc cylindrical surface extending to the left and right of a straight generatrix. An elastic body is embedded between the top surface of the cylinder receiving cavity and the cylinder barrel of the height adjustment cylinder. The top and bottom surfaces of the elastic body are respectively attached to the top surface of the cylinder receiving cavity and the cylinder barrel surface of the height adjustment cylinder.

[0014] The top surface of the cylinder receiving cavity near the low-speed end of the boom is a concave arc cylindrical surface extending back and forth along a straight generatrix. The top surface of the end conformally covers the hinge lug of the height adjustment cylinder near the low-speed end of the boom.

[0015] Each of the front and rear pin mounting holes is equipped with a set of bearings, and the housing of the cutting motor is rotatably supported in the corresponding front and rear pin mounting holes by means of the bearings.

[0016] The outer surface of the cantilever end of the forearm and the outer surface of the high-speed end of the boom on the same swing arm housing are configured as a first set of convex arc cylindrical surfaces coaxial with the front pin mounting hole. The front groove and the rear groove are configured as a first set of concave arc cylindrical surfaces coaxial with the front pin mounting hole. The first set of concave arc cylindrical surfaces and the first set of convex arc cylindrical surfaces are coaxial and spaced apart from each other. The side of the connecting arm near the high-speed end of the boom is configured as a second set of concave arc cylindrical surfaces coaxial with the front pin mounting hole. The outer surface of the cantilever end of the first ear and the outer surface of the cantilever end of the second ear are configured as a second set of convex arc cylindrical surfaces coaxial with the front pin mounting hole. The second set of convex arc cylindrical surfaces and the second set of concave arc cylindrical surfaces are coaxial and spaced apart from each other.

[0017] The beneficial effects of this invention are:

[0018] The swing arm of the present invention can be hinged to the front of the coal mining machine body with the cutting motor as the pin shaft, which shortens the left and right length of the front of the body, which is equivalent to shortening the left and right length of the suspended body section of the coal mining machine. The center of gravity of the coal mining machine body moves to the goaf side accordingly, thereby improving the stress stability of the entire coal mining machine.

[0019] The swing arm of the present invention can be hinged to the front of the coal mining machine body with the cutting motor as the pin shaft. Only the connecting arm on the inner side of the upper drum swings up and down with the swing arm. The flat and thin structure of the connecting arm and the special top inclined surface structure make the swing arm housing have little impact on the coal platform above when it swings up and down, thus ensuring a large mining range.

[0020] The swing arm of the present invention can be hinged to the front of the coal mining machine body with the cutting motor as the pin. At the same time, the main deceleration part of the swing arm is served by the planetary deceleration mechanism set in the drum. Therefore, only a relatively simple cutting transmission mechanism (such as a two-stage fixed-axis gear transmission mechanism) needs to be set in the swing arm. The boom shape is more regular. The cutting motor and the cutting transmission mechanism together form a cutting mechanism with a simple structure and compact dimensions in the left and right directions.

[0021] The height adjustment cylinder is positioned below the cutting motor, which not only makes full use of the space between the roof and floor of the coal face but also significantly shortens the lateral length of the suspended machine body. For a double-drum coal mining machine, this reduces the distance between the two drums. The relatively enclosed cylinder housing provides a cleaner working space for the swinging of the height adjustment cylinder and the layout of the cylinder pipelines, ensuring that the free extension and retraction of the height adjustment cylinder and the free swinging of the swing arm housing are not affected by coal or other mineral materials, ultimately ensuring that the maximum mining range is not affected.

[0022] The connecting arm also has an inner cavity that communicates with the inner cavity of the boom, increasing the oil storage volume within the swing arm housing. Furthermore, the connecting arm's inner cavity is equipped with an enhanced cooler to strengthen the cooling oil chamber, thereby improving the cooling effect of the high-power-density swing arm.

[0023] The forearm, as the main supporting force-bearing part, is separate from the boom equipped with the cutting transmission mechanism. Although the front part of the high-speed end of the boom is part of the boom, it only serves as a secondary force-bearing part that provides auxiliary support. Therefore, it can basically ensure that the cutting transmission mechanism is in a good non-stressed state, thus ensuring transmission accuracy.

[0024] The cutting transmission mechanism and the rear pin mounting hole for auxiliary support of the cutting motor are both located inside the boom, which not only makes the structure more compact, but also allows the power input connection point of the cutting transmission mechanism to be closer to the auxiliary support point, resulting in less impact from vibration during power transmission and more stable and reliable power transmission. Attached Figure Description

[0025] Figure 1 This is a front view of an embodiment of the swing arm support structure of the present invention;

[0026] Figure 2 for Figure 1 Top sectional view;

[0027] Figure 3 for Figure 2 AA section view;

[0028] Figure 4 for Figure 2 BB cross-sectional view;

[0029] Figure 5 This is a schematic diagram of the swing arm support structure when the swing arm is raised at a certain angle.

[0030] Figure 6 The diagram shows the working state of the thin coal seam short span coal mining machine using the present invention.

[0031] Figure label:

[0032] 1. Swing arm; 11. Swing arm housing; 111. Forearm; 112. Front part of the high-speed end of the boom; 113. Rear part of the high-speed end of the boom; 114. Connecting arm; 1140. Window; 1141. Side near the high-speed end of the boom; 1142. Side near the low-speed end of the boom; 1143. Inner cavity of the connecting arm; 1144. Hydraulic cylinder receiving cavity; 1146. Top surface of the end of the hydraulic cylinder receiving cavity; 1147. Top surface of the middle part of the hydraulic cylinder receiving cavity; 12. Cutting transmission mechanism; 121. Input end gear; 13. Roller; 14. Bearing;

[0033] 2. Front main body shell; 214. Front groove; 215. Larger diameter groove; 216. Smaller diameter groove;

[0034] 3. Cut the motor;

[0035] 4. Height adjustment cylinder; 41. Outer pin; 42. Outer surface of hinge lug; 43. Elastomer; 44. Cylinder barrel; 45. Cylinder rod. Detailed Implementation

[0036] This invention discloses a swing arm 1 (which may be simply referred to as a swing arm) for a short-span coal mining machine in thin coal seams, such as... Figure 1-6 As shown, the boom includes a swing arm housing 11, the main body of which is a boom extending to the left and right. A cutting transmission mechanism 12 is installed inside the boom. The cutting transmission mechanism uses 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 output gear (also the low-speed gear) of the cutting transmission mechanism are located are respectively designated 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 forearm 111 extending to the left or right from the connecting arm is provided on the connecting arm; that is, for the right swing arm housing of the coal mining machine, the forearm extends to the left from the connecting arm; for the left swing arm housing of the coal mining machine, the forearm extends to the right from the connecting arm. The forearm is located in front of the high-speed end of the boom. The front portion 112 of both the forearm and the high-speed end of the boom has a front pin mounting hole and a rear pin mounting hole, respectively, for hinged connection between the swing arm and the coal mining machine body. The input gear is mounted on the rear portion 113 of the high-speed end of the boom, and both the front and rear pin mounting holes are coaxial with the input gear. The front and rear pin mounting holes are used to mount the cutting motor 3; their coaxiality with the input gear ensures that the installed cutting motor transmits power coaxially with the input gear. The swing arm is hinged to the front of the coal mining machine body via the front portion of the forearm and the high-speed end of the boom. The cutting motor is fixedly connected and rotatably connected relative to the machine body and the swing arm housing, respectively, achieving a hinged connection between the swing arm housing and the machine body with the cutting motor as the pin. By using the entire cutting motor as the pin, the lateral length of the suspended machine body section is shortened, and the structure of the cutting mechanism is simplified. The layout of the winding and rotor structures inside the cutting motor can still adopt a conventional structure.

[0037] The lower part of the connecting arm is provided with a cylinder receiving cavity 1144 that extends horizontally and opens downwards. In the front-back direction, the cylinder receiving cavity is located below the forearm. This cylinder receiving cavity is used to install the height adjustment cylinder 4. During installation, most of the height adjustment cylinder is located in the cylinder receiving cavity. One end of the height adjustment cylinder is hinged to the connecting arm, and the other end is hinged to the machine body.

[0038] Furthermore, a pair of coaxial cylinder outer pin holes are provided on the front and rear walls of the cylinder receiving cavity. The axis of the cylinder outer pin holes extends front and rear and is close to the low-speed end of the boom in the left and right direction. The cylinder outer pin holes are used to install the outer pin shaft 41, and the outer pin shaft is used to install the hinge lug at one end of the height adjustment cylinder.

[0039] The connecting arm is narrowest in the upper middle part in the vertical direction, and widens towards the top and bottom, especially at the bottom, to accommodate the hydraulic cylinder cavity. The entire connecting arm has a thin, flat structure. The narrowest point is preferably at the same height as the front pin mounting hole. The top surface of the connecting arm is sloped, and the end closer to the high-speed end of the boom is higher in the horizontal direction. This thin, flat structure and unique sloped surface of the connecting arm ensure that the swing arm housing has minimal impact on the upper coal platform when swinging up and down, thus guaranteeing a large mining range.

[0040] The side 1142 of the connecting arm near the low-speed end of the boom in the left-right direction is set as a concave arc cylindrical surface coaxial with the output end gear. This concave arc cylindrical surface can maintain a certain gap with the blades of the drum 13, thereby improving the loading effect of the drum screw conveyor.

[0041] The connecting arm has an inner cavity 1143 that communicates with the inner cavity of the boom, increasing the oil storage volume within the swing arm housing. An enhanced cooler is installed in the inner cavity 1143 of the connecting arm to enhance the cooling of the oil chamber, thereby improving the cooling effect of the high-power-density swing arm. The enhanced cooler may contain multiple cooling pipes, which can be connected in series or parallel.

[0042] A window 1140 is provided on the front wall of the cylinder receiving cavity to facilitate the maintenance of the height-adjusting cylinder, etc.

[0043] This invention also discloses a swing arm support structure for a thin coal seam short-span coal mining machine, including a front main body shell 2, a height adjustment cylinder 4, a cutting motor 3, and any one of the aforementioned swing arms 1 for a thin coal seam short-span coal mining machine. The right or left edge of the front main body shell is provided with a first lug, a second lug, and a connecting base sequentially from front to back. A front groove 214 is formed between the first lug and the second lug, and a rear groove is formed between the second lug and the connecting base. The high-speed ends of the forearm and the boom are respectively inserted into the front groove and the rear groove. The cutting motor is installed as a hinge pin in an inner hole formed by the lug hole of the first lug, the front pin mounting hole, the lug hole of the second lug, and the rear pin mounting hole. The output shaft of the cutting motor is coaxially connected to the input gear. The cutting motor is fixedly connected and rotatably connected to the front main body shell and the swing arm shell, respectively.

[0044] The lower right or left end of the front main body housing is provided with a cylinder inner pin hole. The majority of the height-adjusting cylinder is located within the cylinder receiving cavity. The outer and inner pins of the height-adjusting cylinder, which are hinged to the connecting arm and the front main body housing, are respectively installed in the outer and inner pin holes of the cylinder. The extension and retraction of the height-adjusting cylinder can cause the swing arm housing to swing up and down around the front main body housing. The cylinder receiving cavity provides a relatively clean working space for the height-adjusting cylinder, ensuring that the swing arm housing is not affected by coal or other mineral materials during its swing, ultimately ensuring that the maximum mining range is not affected.

[0045] The front-to-back width of the cylinder receiving cavity is slightly wider than the diameter of the cylinder barrel 44 of the height adjustment cylinder. The top surface 1147 of the middle part of the cylinder receiving cavity is a concave arc cylindrical surface extending to the left and right of a straight generatrix. The space above the cylinder barrel of the height adjustment cylinder and below the top surface 1147 of the middle part of the cylinder receiving cavity is relatively closed and can be used for the laying of cylinder pipelines.

[0046] An elastic body 43 can be embedded between the top surface of the middle part of the hydraulic cylinder receiving cavity and the cylinder barrel of the height adjustment hydraulic cylinder. The elastic body can be made of a high-elasticity sponge or similar material. The top and bottom surfaces of the elastic body are respectively attached to the top surface of the middle part of the hydraulic cylinder receiving cavity and the cylinder barrel surface of the height adjustment hydraulic cylinder, so that the elastic body fills the space above the hydraulic cylinder and below the top surface of the middle part of the hydraulic cylinder receiving cavity, which can prevent coal dust from entering the hydraulic cylinder receiving cavity from above.

[0047] Furthermore, the top surface 1146 of the cylinder receiving cavity near the low-speed end of the boom is a concave arc cylindrical surface extending forward and backward along a straight generatrix. This top surface 1146 conforms to the shape of the hinge lug of the height-adjusting cylinder near the low-speed end of the boom, nearly fitting against the outer surface 42 of the hinge lug. This effectively seals the outer end of the cylinder receiving cavity, preventing coal dust from entering the cylinder receiving cavity from the outside. Combined with the aforementioned elastic body, the cylinder receiving cavity, especially the space above the cylinder barrel, is relatively enclosed, effectively preventing coal dust from entering and ensuring a relatively clean state inside the cylinder receiving cavity. In the embodiment shown in the attached drawings, the cylinder barrel 44 is connected to the connecting arm, and the cylinder rod 45 is connected to the front main body housing.

[0048] Each of the front and rear pin mounting holes is fitted with a set of bearings 14, and the housing of the cutting motor is rotatably supported in the corresponding front and rear pin mounting holes via these bearings. The bearings bear most of the load at the hinge, effectively protecting the swing arm housing, machine housing, and cutting motor from or minimizing impact, thus maintaining reliable connection.

[0049] The cutting motor is preferably supported on the swing arm housing by a spherical plain bearing. Using a spherical plain bearing helps maintain the concentricity of the front and rear pin mounting holes with the cutting motor housing, improving the transmission accuracy between the cutting motor and the cutting transmission mechanism. A friction-reducing layer is also preferably provided between the inner and outer rings of the spherical plain bearing. This reduces wear on the bearing sliding pair, and the seals at both ends of the friction-reducing layer ensure the cleanliness of the internal friction pairs, maintaining good lubrication conditions inside the bearing. Correspondingly, this also helps improve the transmission accuracy between the cutting motor and the cutting transmission mechanism.

[0050] The outer surface of the cantilever end of the forearm and the outer surface of the high-speed end of the boom on the same swing arm housing are configured as a first set of convex arc cylindrical surfaces coaxial with the front pin mounting hole. The front groove 214 and the rear groove are configured as a first set of concave arc cylindrical surfaces coaxial with the front pin mounting hole. The first set of concave arc cylindrical surfaces and the first set of convex arc cylindrical surfaces are coaxial and spaced apart. The side 1141 of the connecting arm near the high-speed end of the boom is configured as a second set of concave arc cylindrical surfaces coaxial with the front pin mounting hole. The outer surface of the cantilever end of the first lug and the outer surface of the cantilever end of the second lug are configured as a second set of convex arc cylindrical surfaces coaxial with the front pin mounting hole. The second set of convex arc cylindrical surfaces and the second set of concave arc cylindrical surfaces are coaxial and spaced apart. By controlling the size of the corresponding intervals within a suitable range, the accumulation of coal and rock between the swing arm housing and the front main body housing can be effectively controlled during the swinging process of the swing arm housing relative to the front main body housing.

[0051] The rear recess is a stepped groove, where the larger diameter groove 215 is used to accommodate the front part of the high-speed end of the boom, and the smaller diameter groove 216 is used to accommodate the rear part of the high-speed end of the boom. Correspondingly, the outer surface of the high-speed end of the boom is also stepped.

[0052] Unless otherwise specified, "before" and "after" in this article refer to directions closer to the coal face and directions farther from the coal face, respectively.

Claims

1. A thin seam shortwall mining machine swing arm characterized by: The swing arm shell includes a left and right extending arm frame, a cutting transmission mechanism is installed in the arm frame, the input gear and the output gear of the cutting transmission mechanism are respectively located at the high speed end and the low speed end of the arm frame, a connecting arm is provided in the middle of the arm frame and suspends forward from the arm frame, a front arm is provided on the connecting arm and suspends left or right from the connecting arm, the front arm is located in front of the high speed end of the arm frame, the front arm and the front part of the high speed end of the arm frame are respectively provided with front pin shaft mounting holes and rear pin shaft mounting holes for realizing the hinging of the thin coal seam short span mining machine swing arm and the mining machine body, the input gear is installed at the rear part of the high speed end of the arm frame, the front pin shaft mounting hole and the rear pin shaft mounting hole are coaxial with the input gear, the connecting arm extends downward beyond the bottom surface of the middle part of the arm frame, the lower part of the connecting arm is provided with an oil cylinder containing cavity extending left and right and opening downward, the oil cylinder containing cavity is located below the front arm in the front and rear direction, a pair of coaxial oil cylinder outer pin holes are provided on the front and rear cavity walls of the oil cylinder containing cavity, and the axis of the oil cylinder outer pin hole extends forward and backward.

2. A thin-seam shortwall mining machine swing arm as claimed in claim 1, characterized in that: The middle and upper part of the connecting arm is the narrowest in the left and right direction, and the left and right width becomes wider as it approaches the upper and lower ends, and the lower part is wider, the top surface of the connecting arm is an inclined surface, and the higher it is closer to the high speed end of the arm frame in the left and right direction.

3. A thin-seam shortwall mining machine swing arm as claimed in claim 2, characterized in that: The side surface of the connecting arm close to the low speed end of the arm frame is set as a concave circular cylindrical surface coaxial with the output gear in the left and right direction.

4. A thin-seam shortwall mining machine swing arm as claimed in claim 3, characterized in that: The connecting arm is provided with an inner cavity and communicates with the inner cavity of the arm frame, and a reinforced cooler is arranged in the inner cavity of the connecting arm.

5. A thin-seam shortwall mining machine swing arm as claimed in claim 1, 2, 3 or 4, characterized by: A window is provided on the front cavity wall of the oil cylinder containing cavity.

6. A thin seam shortwall mining machine swing arm support structure characterized by: The thin coal seam short span mining machine swing arm includes a front body part shell, a height adjusting oil cylinder, a cutting motor and the swing arm of claim 1, 2, 3, 4 or 5, the right edge or the left edge of the front body part shell is provided with a first ear seat, a second ear seat and a connecting base in sequence from front to back, the first ear seat and the second ear seat form a front groove, the second ear seat and the connecting base form a rear groove, the front arm and the high speed end of the arm frame are respectively inserted into the front groove and the rear groove, the 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 and the rear pin shaft mounting hole as a hinged pin shaft, the output shaft of the cutting motor is coaxially connected with the input gear, the cutting motor is fixedly connected and rotatably connected with the front body part shell and the swing arm shell respectively, the height adjusting oil cylinder is located in the oil cylinder containing cavity, one end of the height adjusting oil cylinder is hinged on the outer pin shaft installed in the oil cylinder outer pin hole, and the other end of the height adjusting oil cylinder is hinged on the front body part shell.

7. A thin-seam shortwall machine swing arm support structure as claimed in claim 6, characterised in that: The middle part top surface of the oil cylinder containing cavity is a concave circular cylindrical surface extending left and right with a straight generatrix, and an elastomer is embedded and installed between the middle part top surface of the oil cylinder containing cavity and the cylinder barrel of the height adjusting oil cylinder, and the top surface and the bottom surface of the elastomer are respectively attached to the middle part top surface of the oil cylinder containing cavity and the surface of the cylinder barrel of the height adjusting oil cylinder.

8. A thin-seam shortwall machine swing arm support structure as claimed in claim 7, characterised in that: The end part top surface of the oil cylinder containing cavity close to the low speed end of the arm frame is a concave circular cylindrical surface extending forward and backward with a straight generatrix, and the end part top surface covers the hinged ear of the height adjusting oil cylinder close to the low speed end of the arm frame.

9. Thin-seam shortwall mining machine swing arm support structure as claimed in claim 6, 7 or 8, characterized in that: A set of bearings is respectively installed in the front pin shaft mounting hole and the rear pin shaft mounting hole, and the housing of the cutting motor is rotationally supported in the corresponding front pin shaft mounting hole and the rear pin shaft mounting hole through the bearings.

10. A thin-seam shortwall machine swing arm support structure as claimed in claim 9, characterised in that: The overhanging end outer surface of the front arm and the high-speed end outer surface of the arm support on the same swing arm housing are provided as a first set of convex circular-arc cylindrical surfaces coaxial with the front pin shaft mounting hole, the front groove and the rear groove are provided as a first set of concave circular-arc cylindrical surfaces coaxial with the front pin shaft mounting hole, and the first set of concave circular-arc cylindrical surfaces are coaxial with the first set of convex circular-arc cylindrical surfaces and are spaced apart from each other; the side surface of the connecting arm close to the high-speed end of the arm support is provided as a second set of concave circular-arc cylindrical surfaces coaxial with the front pin shaft mounting hole, and the overhanging end outer surface of the first lug support and the overhanging end outer surface of the second lug support are provided as a second set of convex circular-arc cylindrical surfaces coaxial with the front pin shaft mounting hole, and the second set of convex circular-arc cylindrical surfaces are coaxial with the second set of concave circular-arc cylindrical surfaces and are spaced apart from each other.

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