Thin seam compact mining machine swing arm and swing arm support structure

Abstract

The invention relates to a kind of thin coal seam compact mining machine swing arm and swing arm support structure, the main body of swing arm shell of swing arm is left and right extension arm support, the middle part of arm support is connected with the connecting arm extending forward, arm support front, back is respectively equipped with forearm and rear arm, the root of forearm is connected on connecting arm, respectively be equipped with hinged connection hole for being hinged with fuselage on forearm and rear arm, rear stage cutting transmission mechanism is installed in arm support, wherein the input gear is coaxial with hinged connection hole;Support structure includes front, rear main body part shell and height adjustment oil cylinder, swing arm, front, rear arm is respectively hinged on front, rear main body part shell, the output gear of front stage cutting transmission mechanism in front main body part shell is coaxial transmission connection with the input gear of rear stage cutting transmission mechanism, height adjustment oil cylinder is hinged between connecting arm and front main body part shell.The invention is compact in structure, can provide larger mining range, realize shorter fuselage length and improve fuselage gravity center problem.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of coal winning machine swing arm and the height adjustment cylinder mounting structure of the swing arm, especially applicable to thin coal seam coal winning machine, help to expand the mining range of thin coal seam coal winning machine, shorten the length of machine body and improve the problem of gravity of suspended machine body. BACKGROUND

[0002] The cutting motor of the existing thin coal seam coal winning machine is generally located on the swing arm, and swings with the swing arm. When the rear swing arm of the thin coal seam suspended machine coal winning machine in the direction of travel picks up the knife, the problem of the rear drum mining height being too small occurs. The reason is that when the mining height is increased, the rear swing arm cutting motor will interfere with the upper coal table left after the front drum cuts the bottom knife, so the overall mining height of such coal winning machine is too narrow, and cannot adapt to the mining requirements of the large thickness variation of thin coal seam working face in China.

[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 left and right lengths of the machine body suspension section, and a still large influence of the gravity center of the whole machine on the stress of the whole machine.

[0004] At the same time, due to the existing structure of the support oil cylinder installed in an open space, coal and rock are accumulated above and below the support oil cylinder during work, especially the coal and rock accumulated between the support oil cylinder and the coal winning machine body shell, which will cause the oil cylinder to be limited in swinging, resulting in the mining height not reaching the theoretical mining requirement, and some even directly causing the oil cylinder to break. Moreover, the existing oil cylinder arrangement in the left and right longitudinal direction of the coal winning machine body further causes the length of the machine body to be lengthened and the gravity center of the suspended machine body to be biased towards the coal wall. SUMMARY

[0005] The present application aims to provide a thin coal seam compact coal winning machine swing arm and swing arm support structure, which is compact in structure, can provide a larger mining range, a shorter machine body, and improve the problem of machine body gravity center.

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

[0007] A thin coal seam mining machine swing arm, comprising a swing arm shell, the main body of the swing arm shell is a left and right extending arm support, a rear stage cutting transmission mechanism is installed in the arm support, the input end gear and the output end gear of the rear stage cutting transmission mechanism are respectively the high speed end and the low speed end of the arm support, a connecting arm is provided in the middle of the arm support and suspends forward from the arm support, a front arm is provided on the connecting arm and suspends left or right from the connecting arm, a rear arm is provided behind the high speed end of the arm support, the rear arm is a cantilever structure with one end connected to the arm support, a front hinge connecting hole and a rear hinge connecting hole are respectively provided on the front arm and the rear arm, the front hinge connecting hole, the rear hinge connecting hole and the input end gear are coaxial, a semi-closed oil cylinder outer containing cavity is provided at the lower part of the connecting arm, oil cylinder outer pin holes for hinge height adjusting oil cylinders are provided on the front and rear cavity walls of the oil cylinder outer containing cavity, the axes of the oil cylinder outer pin holes extend forward and backward, the oil cylinder outer containing cavity is located at the position of the front end of the middle part of the connecting arm in the front and back direction, and the oil cylinder outer pin holes are close to the low speed end of the arm support in the left and right direction.

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

[0009] The side surface of the connecting arm close to the low speed end of the arm support in the left and right direction is set as a concave circular cylindrical surface coaxial with the output end gear of the rear stage cutting transmission mechanism.

[0010] The thin coal seam compact mining machine swing arm further comprises a planetary reduction mechanism, the gear ring of the planetary reduction mechanism is installed at the front of the low speed end of the arm support, and the sun gear of the planetary reduction mechanism is coaxially connected with the output end gear of the rear stage cutting transmission mechanism.

[0011] Windows can be provided on the coal wall side cavity wall of the oil cylinder outer containing cavity.

[0012] The application discloses a swing arm support structure of a thin seam compact coal mining machine, which comprises a front main body part shell, a rear main body part shell, a height adjusting oil cylinder and the swing arm of the thin seam compact coal mining machine, the front main body part shell is butted and fixed with the rear main body part shell, the right edge or the left edge of the front main body part shell is sequentially provided with a first lug, a second lug and a connecting base from front to back, a front groove is formed between the first lug and the second lug, a middle groove is formed between the second lug and the connecting base, the rear main body part shell comprises a rear base body and a third lug which is suspended from the middle part of the rear base body and extends to the right or left, a rear groove is formed between the third lug and the rear base body, a front stage cutting transmission mechanism and a cutting motor are installed in the front main body part shell, the front stage cutting transmission mechanism comprises input end gears, idler groups and output end gears which are sequentially arranged and connected in the left-right direction, the output shaft of the cutting motor is coaxially and transmissionally connected with the input end gears of the front stage cutting transmission mechanism, the output end gears of the front stage cutting transmission mechanism are located in the connecting base, a front arm, a high speed end of an arm support and a rear arm are respectively inserted into the front groove, the middle groove and the rear groove, wherein the front arm is hinged with the first lug and the second lug, the rear arm is hinged with the third lug and the rear base body, the output end gears of the front stage cutting transmission mechanism and the input end gears of a rear stage cutting transmission mechanism are coaxially and transmissionally connected, and coaxially connected with a front hinged connection hole, the lower part of the right end or the left end of the front main body part shell is provided with a semi-closed oil cylinder containing cavity, the height adjusting oil cylinder is located in an oil cylinder containing cavity which is composed of an oil cylinder outer containing cavity and the oil cylinder containing cavity, one end of the height adjusting oil cylinder is hinged on a connecting arm, the other end is hinged on the front main body part shell, and the cavity wall outer surfaces of the oil cylinder outer containing cavity and the oil cylinder containing cavity which face each other are kept apart.

[0013] The rear stage cutting transmission mechanism is provided with a rear stage spline hole, a spline sleeve with an inner spline and an outer spline is installed in the rear stage spline hole, and the spline holes of the spline sleeve and the output end gear core of the front stage cutting transmission mechanism are simultaneously spline-connected with a spline shaft.

[0014] A front wear sleeve is respectively installed in the lug hole of the first lug and the lug hole of the front part of the second lug, a rear wear sleeve is respectively installed in the lug hole of the third lug and the lug hole of the front part of the rear base body, a sliding bearing is installed in the front hinged connection hole and the rear hinged connection hole, the sliding bearings in the front hinged connection hole and the rear hinged connection hole are respectively sleeved and installed in the middle part of a front pin shaft sleeve and a rear pin shaft sleeve, the front part and the rear part of the front pin shaft sleeve are tightly matched with the front wear sleeve, the front part and the rear part of the rear pin shaft sleeve are tightly matched with the rear wear sleeve, the inner hole of the front pin shaft sleeve is communicated with the inner hole of the second lug, a limiting rod is installed in the two inner holes, the rear end of the limiting rod extends into the rear stage spline hole to axially limit the front end of the spline shaft, the front part of the limiting rod is fixed relative to the front pin shaft sleeve, and the remaining part of the limiting rod does not contact the inner hole of the front pin shaft sleeve, the inner hole of the second lug and the rear stage spline sleeve.

[0015] The outer surface of the overhanging end of the front arm, the outer surface of the high-speed end of the arm frame and the outer surface of the overhanging end of the rear arm on the same swing arm shell are arranged as a first group of convex circular cylindrical surfaces coaxial with the front hinge connection hole, and the corresponding front groove, middle groove and rear groove are arranged as a first group of concave circular cylindrical surfaces coaxial with the front hinge connection hole, the first group of concave circular cylindrical surfaces correspond to the first group of convex circular cylindrical surfaces and are spaced from each other; the outer surface of the overhanging end of the first lug and the outer surface of the overhanging end of the second lug are arranged as a second group of convex circular cylindrical surfaces coaxial with the front hinge connection hole, and the side surface of the connecting arm close to the high-speed end of the arm frame is arranged as a second group of concave circular cylindrical surfaces coaxial with the front hinge connection hole, the second group of convex circular cylindrical surfaces correspond to the second group of concave circular cylindrical surfaces and are spaced from each other.

[0016] The left and right edges of the front main body shell are respectively provided with the first lug, the second lug and the connecting base, and the rear main body shell is correspondingly provided with left and right two third lugs and a rear groove, and the left and right two thin seam compact coal mining machine swing arms are respectively hinged to the left and right ends of the front main body shell and the rear main body shell from the left and right sides, and the front main body shell is internally provided with left and right two groups of front-stage cutting transmission mechanisms, and the two groups of front-stage cutting transmission mechanisms share one input end gear.

[0017] The left and right two cylinder containing cavities of the front main body shell are communicated, or the lower part of the front main body shell is provided with one cylinder containing cavity shared by the left and right sides.

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

[0019] The front arm and the rear arm of the swing arm form two hinge connection points in front and back of the machine body, and the rear-stage cutting transmission mechanism installed in the arm frame between the front arm and the rear arm forms a power transmission connection point with the front-stage cutting transmission mechanism installed in the machine body. The two hinge connection points are separately arranged in front and back of the power transmission connection point, and the radial displacement caused by wear at the two hinge connection points has less influence on the power transmission connection point between them, so the influence on the transmission accuracy can be reduced.

[0020] The front-stage cutting transmission mechanism and the spline shaft, the spline shaft and the spline sleeve, and the spline sleeve and the rear-stage cutting transmission mechanism are all spline coupled, the spline coupling structure with side clearance at multiple positions can significantly increase the radial floating amount, and because the related parts forming the spline coupling structure can automatically center, even if the coaxiality of the front and back two hinges between the swing arm shell and the machine body decreases due to wear, the influence on the power transmission between the front-stage cutting transmission mechanism and the rear-stage cutting transmission mechanism is also relatively small, so the power transmission reliability is improved.

[0021] The outer surfaces of the overhanging ends of the front arm, the high-speed end of the arm support and the overhanging end of the rear arm are spaced apart from the bottom of the front, middle and rear grooves by a uniform gap, and the outer surfaces of the overhanging ends of the first and second lug supports are spaced apart from the connecting arm by a uniform gap. As long as the gap is controlled within a proper range, the coal and rock accumulation between the swing arm housing and the front and rear main body housings can be effectively controlled during the up-and-down swinging of the swing arm housing, and the smooth swinging can be ensured.

[0022] By providing the semi-closed oil cylinder accommodating cavity on the connecting arm and the lower part of the front main body, sufficient space can be provided for the swinging of the height-adjusting oil cylinder and the accommodation of certain coal and the layout of pipelines.

[0023] The front and rear articulations are located close to the left or right side of the cutting motor, and no other structures are located between them. Therefore, the left and right lengths of the machine body, especially the overhanging machine body section, are obviously shortened, and the connection reliability of the swing arm and the machine body is improved. When the drum top cutter is cutting, only the part of the connecting arm inside the drum changes its position up and down with the swinging of the swing arm. In combination with the flat and thin structure of the connecting arm and the special inclined surface structure, the swing arm housing has little effect on the coal table above when it swings up and down. Therefore, a large mining range can be ensured.

[0024] In addition, the height-adjusting oil cylinder is arranged below the cutting motor, which further reduces the space occupation in the left and right directions and provides a guarantee for realizing the compact short machine body structure of the coal mining machine. Due to the shortening of the left and right lengths of the overhanging machine body section, the gravity center of the whole machine can be offset to the rear, and the stress stability of the whole machine is improved. Moreover, due to the shortening of the machine body, the coal mining machine can conveniently perform the straight pushing cutter process similar to the shortwall coal mining machine, thereby improving the mining efficiency.

[0025] The height-adjusting oil cylinder is arranged below the cutting motor, and the space above the floor is fully utilized.

[0026] The main reduction part of the swing arm, i.e., the planetary reduction mechanism, is arranged inside the drum, and the other reduction parts, i.e., the front and rear cutting transmission mechanisms, can be relatively simple, and the outer shape of the arm support is relatively regular. Therefore, the machine body and the connection structure of the swing arm and the machine body can be more compact in the left and right directions.

[0027] When applied to a double-drum coal mining machine, the cutting motor is the common power source of the left and right swing arms. The cutting motor is connected to the swing arms without power source through gear transmission. The structures of the front main body and the swing arm can be simplified, and the compactness of the overall structure is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Structure diagram of an embodiment of the swing arm support structure of the present application;

[0029] Figure 2Fig. 1 is a top view of a sectional view of an embodiment of the swing arm support structure of the present application;

[0030] Figure 3 Fig. 2 is a sectional view of A-A of Fig. 1; Figure 2

[0031] Figure 4 Fig. 3 is a structural schematic diagram of the swing arm in Fig. 1; Figure 1 2

[0032] Figure 5 Fig. 4 is a structural schematic diagram of an embodiment of the front body part;

[0033] Figure 6 Fig. 5 is a structural schematic diagram of an embodiment of the rear body part;

[0034] Figure 7 Fig. 6 is a schematic diagram of the working state of a double-drum compact coal mining machine of the present application when walking to the left and cutting coal.

[0035] Reference signs:

[0036] 1. swing arm; 11. swing arm housing; 111. front arm; 1111. outer surface of the overhanging end of the front arm; 112. rear arm; 113. high-speed end of the arm support; 114. connecting arm; 1141. side close to the high-speed end of the arm support; 1142. side close to the low-speed end of the arm support; 1144. outer oil cylinder accommodating cavity; 1146. concave circular-arc cylindrical surface; 115. raised structure; 12. rear-stage cutting transmission mechanism; 121. input gear; 122. planetary reduction mechanism; 123. spline shaft; 124. spline sleeve; 13. drum; 14. sliding bearing;

[0037] 2. front body part; 21. front body part housing; 211. first ear seat; 212. second ear seat; 2121. outer surface of the overhanging end of the second ear seat; 213. connecting base; 214. front groove; 215. middle groove; 216. oil cylinder accommodating cavity; 22. cutting motor; 23. clutch mechanism; 24. input gear; 25. output gear; 29. positioning pin;

[0038] 3. rear body part; 31. rear body part housing; 311. third ear seat; 312. rear groove;

[0039] 41. front pin shaft sleeve; 42. rear pin shaft sleeve;

[0040] 5. height-adjusting oil cylinder. DETAILED DESCRIPTION

[0041] The present application discloses a swing arm 1 (which can be simply referred to as a swing arm) of a thin coal seam coal mining machine, as shown in Figures 1-7 ​​​As shown, the swing arm housing 11 includes a left and right extending arm frame, a rear stage cutting transmission mechanism 12 is installed in the arm frame. The rear stage cutting transmission mechanism adopts a fixed shaft gear transmission mechanism. In order to distinguish the two ends of the arm frame, the input gear and the output gear of the rear stage cutting transmission mechanism are respectively referred to as the high speed end and the low speed end of the arm frame. A connecting arm 114 is provided in the middle of the arm frame, the connecting arm extends forward from the arm frame, and a front arm 111 extends left or right from the connecting arm, that is, for the right swing arm housing of the coal mining machine, the front arm extends left from the connecting arm; for the left swing arm housing of the coal mining machine, the front arm extends right from the connecting arm. A rear arm 112 is provided behind the high speed end 113 of the arm frame, and the rear arm is a cantilever structure connected to the arm frame at one end.

[0042] The front arm and the rear arm are respectively provided with front and rear hinge connection holes, and the front and rear hinge connection holes are coaxial with the input gear. The input gear is used to receive power from the front stage cutting transmission mechanism, and the coaxial arrangement can ensure that the power transmission from the front stage cutting transmission mechanism to the rear stage cutting transmission mechanism and the up and down swing of the swing arm relative to the machine body can be carried out at the same time without interfering with each other. Sealing rings are installed on the front and rear end faces of the front arm, the high speed end of the arm frame and the rear arm respectively, for realizing end face sealing at the relative swing joint surface between the swing arm housing and the machine body.

[0043] The lower part of the connecting arm is provided with a semi-closed oil cylinder outer containing cavity 1144. One end of the oil cylinder outer containing cavity in the left and right direction is opposite to the machine body, and the other end is sealed. The oil cylinder outer pin hole for hinge height adjustment oil cylinder is provided on the front and rear cavity walls of the oil cylinder outer containing cavity, and the axis of the oil cylinder outer pin hole extends forward and backward. The oil cylinder outer containing cavity and the oil cylinder containing cavity 216 provided on the machine body are combined to form an oil cylinder containing cavity for containing the height adjustment oil cylinder 5.

[0044] The oil cylinder outer containing cavity in the front and rear direction is located at the position of the front end of the middle part of the connecting arm, and the oil cylinder outer pin hole is close to the low speed end of the arm frame in the left and right direction. The inner surface of the oil cylinder outer containing cavity close to the low speed end of the arm frame is preferably provided as a concave arc cylindrical surface 1146 coaxial with the oil cylinder outer pin hole. In the installed state, the corresponding end outer surface of the height adjustment oil cylinder and the concave arc cylindrical surface 1146 form a gap with equal width, which is narrow enough to neither affect the swing of the height adjustment oil cylinder nor cause blockage of coal powder.

[0045] The left and right width of the middle and upper part of the connecting arm is the narrowest, and the closer to the upper and lower ends, the wider, especially the lower part is wider, for setting the outer oil cylinder cavity, and the whole connecting arm forms a flat and thin structure. The left and right width of the narrowest part is preferably the same height as the front hinge connection hole. The top surface of the connecting arm is inclined, and the closer to the high-speed end of the arm support, the higher the top surface of the connecting arm in the left and right direction. The flat and thin structure of the connecting arm and the special inclined surface structure make the swing arm shell swing up and down without affecting the upper coal table, so that a large mining range can be ensured.

[0046] The root of the rear arm of the arm support can be provided with a rear protruding bump structure 115, which improves the connection strength of the rear arm and the arm support, and the internal cavity of the bump structure is an auxiliary cavity, which is part of the internal cavity of the arm support, and increases the oil storage volume of the oil cavity of the arm support.

[0047] The side surface 1142 of the connecting arm near the low-speed end of the arm support in the left and right direction is set as a concave circular arc cylindrical surface coaxial with the output gear of the rear cutting transmission mechanism, which can maintain a certain equal interval gap with the drum blade, and improve the loading effect of the drum screw conveying material.

[0048] The thin coal seam compact mining machine swing arm further comprises a planetary reduction mechanism 122, the gear ring of the planetary reduction mechanism is installed at the front of the low-speed end of the arm support, and the sun gear of the planetary reduction mechanism is coaxially connected with the output gear of the rear cutting transmission mechanism. The drum 13 is sleeved outside the planetary reduction mechanism and fixedly connected with the planetary carrier of the planetary reduction mechanism.

[0049] Windows can be opened on the coal wall side cavity wall of the outer oil cylinder cavity to facilitate maintenance of the height-adjusting oil cylinder.

[0050] The application also discloses a thin coal seam compact mining machine swing arm support structure (which can be referred to as a swing arm support structure), which comprises a front main body part shell 21 of a front main body part 2, a rear main body part shell 31 of a rear main body part 3, a height adjustment oil cylinder 5 and the thin coal seam compact mining machine swing arm 1, the front main body part shell and the rear main body part shell are connected in front and back, and the two are positioned by a large plane and a plurality of positioning pins 29 and are fixed to form a machine body by fasteners. The right edge or the left edge of the front main body part shell is sequentially provided with a first ear seat 211, a second ear seat 212 and a connecting base 213 from front to back, a front groove 214 is formed between the first ear seat and the second ear seat, and a middle groove 215 is formed between the second ear seat and the connecting base. The rear main body part shell comprises a rear base and a third ear seat 311 which is suspended to the right or to the left in the middle part of the rear base and faces front, and a rear groove 312 is formed between the third ear seat and the rear base. A front-stage cutting transmission mechanism and a cutting motor 22 are installed in the front main body part shell, the front-stage cutting transmission mechanism comprises input end gears 24, idler groups and output end gears 25 which are sequentially arranged in the left-right direction and are sequentially transmissionally connected, the output shaft of the cutting motor is coaxially transmissionally connected with the input end gears of the front-stage cutting transmission mechanism, and in the embodiment shown in the drawing, the two are coaxially connected through a clutch mechanism 23. The output end gears of the front-stage cutting transmission mechanism are located in the connecting base.

[0051] The front arm, the high-speed end of the arm support and the rear arm are respectively inserted into the front groove, the middle groove and the rear groove, wherein the front arm is hinged with the first ear seat and the second ear seat, and the rear arm is hinged with the third ear seat and the rear base. The output end gears 25 of the front-stage cutting transmission mechanism and the input end gears 121 of the rear-stage cutting transmission mechanism are coaxially transmissionally connected, and the axis thereof is coaxial with the front hinged connection hole.

[0052] The front and rear hinged connections are adjacent to the left side or the right side of the cutting motor, and no other structure is arranged between the two, so that the left-right length of the mining machine body, especially the suspended machine body section, is obviously shortened, and the connection reliability of the swing arm and the machine body is improved. When the drum top cutter cuts, only the inside of the drum and the connecting arm part change the up-down position when the swing arm swings, and in combination with the above-mentioned flat and thin structure and the special inclined surface structure of the connecting arm, the swing arm shell basically does not affect the upper coal table when swinging up and down, so that a large mining range can be ensured.

[0053] In addition, the left-right length of the suspended machine body section is shortened, the gravity center of the whole machine can be offset to the rear, and the stress stability of the whole machine is improved. Moreover, the machine body is shortened, and the corresponding mining machine can conveniently perform a straight pushing cutter process similar to a short-wall mining machine, so that the mining efficiency is improved.

[0054] The lower part of the right end or the left end of the front main body part shell is provided with a semi-closed oil cylinder containing cavity 216. The height-adjusting oil cylinder is located in the oil cylinder containing cavity composed of the oil cylinder outer containing cavity and the oil cylinder containing cavity. One end of the height-adjusting oil cylinder is hinged to the connecting arm, and the other end is hinged to the front main body part shell. The cavity walls of the oil cylinder outer containing cavity and the oil cylinder containing cavity facing each other are kept apart from each other. The extension and retraction of the height-adjusting oil cylinder can drive the oscillating arm shell to oscillate up and down around the front and rear main body part shells. The oil cylinder containing cavity is a semi-closed cavity, which can provide enough space for the oscillation of the height-adjusting oil cylinder and the accommodation of a certain amount of coal and the layout of pipelines.

[0055] The input end gear core of the rear cutting transmission mechanism is provided with a rear spline hole, and a spline sleeve 124 with an inner spline and an outer spline is installed in the rear spline hole. The spline hole of the spline sleeve and the spline hole of the output end gear core of the front cutting transmission mechanism are simultaneously spline-coupled with a spline shaft 123. The front cutting transmission mechanism and the spline shaft, the spline shaft and the spline sleeve, and the spline sleeve and the rear cutting transmission mechanism are all spline-coupled, and the spline-coupled structure with side clearance at multiple places can significantly increase the radial floating amount. Moreover, since the related parts forming the spline-coupled structure can automatically center, even if the coaxiality of the front and rear two hinged connections decreases due to wear, the influence on the power transmission between the front and rear cutting transmission mechanisms is relatively small, and therefore the power transmission reliability is improved.

[0056] The front and rear two hinged connection points are separately arranged in front of and behind the power transmission connection point between the front and rear cutting transmission mechanisms. The radial displacement of the two hinged connection points due to wear has less influence on the power transmission connection point located between them, and therefore the influence on the transmission accuracy can be reduced.

[0057] A front wear-resistant sleeve is installed in each of the ear holes of the first ear seat and the front part of the second ear seat, and a rear wear-resistant sleeve is installed in each of the ear holes of the third ear seat and the front part of the rear base. A sliding bearing 14 is installed in each of the front and rear hinged connection holes, and most of the load at the hinged connection is borne by the bearing, which can well protect the oscillating arm shell, the fuselage shell, and the cutting motor from being affected or less affected, and maintain the connection reliability. The sliding bearings in the front and rear hinged connection holes are respectively sleeved and installed in the middle parts of the front pin shaft sleeve 41 and the rear pin shaft sleeve 42. The front part and the rear part of the front pin shaft sleeve are tightly matched with the front wear-resistant sleeve, and the front part and the rear part of the rear pin shaft sleeve are tightly matched with the rear wear-resistant sleeve. The inner hole of the front pin shaft sleeve communicates with the inner hole of the second ear seat, and a limiting rod is installed in the two inner holes. The rear end of the limiting rod extends into the rear spline hole to axially limit the front end of the spline shaft, the front part of the limiting rod is positioned and fixed relative to the front pin shaft sleeve, and the remaining part of the limiting rod does not contact the inner holes of the front pin shaft sleeve and the second ear seat, and the rear spline sleeve. In this embodiment, the front end of the limiting rod is axially fixed on the front pin shaft sleeve by a snap spring and is radially supported on the front pin shaft sleeve.

[0058] The overhanging end outer surface 1111 of the front arm, the high speed end outer surface of the arm support and the overhanging end outer surface of the rear arm on the same swing arm shell are arranged as a first group of convex circular arc cylindrical surfaces coaxial with the front hinged connection hole, and the corresponding front groove, middle groove and rear groove are arranged as a first group of concave circular arc cylindrical surfaces coaxial with the front hinged connection hole, and the first group of concave circular arc cylindrical surfaces correspond to the first group of convex circular arc cylindrical surfaces one by one and are spaced from each other. The overhanging end outer surface of the first lug and the overhanging end outer surface of the second lug 2121 are arranged as a second group of convex circular arc cylindrical surfaces coaxial with the front hinged connection hole, and the side surface 1141 of the connecting arm near the high speed end of the arm support is arranged as a second group of concave circular arc cylindrical surfaces coaxial with the front hinged connection hole, and the second group of convex circular arc cylindrical surfaces correspond to the second group of concave circular arc cylindrical surfaces one by one and are spaced from each other. By controlling the size of the above-mentioned spacing within a suitable range, the accumulation of coal and rock into the swing arm shell and the front and rear main body shell can be effectively controlled during the up and down swing of the swing arm shell, and the smooth swing is ensured.

[0059] The present application can be used on a double drum coal mining machine, and accordingly, the left and right edges of the front main body shell are each provided with the first lug, the second lug and the connecting base, and the rear main body shell is correspondingly provided with left and right two third lugs and a rear groove, and the left and right two thin seam compact coal mining machine swing arms are hinged to the left and right ends of the front main body shell and the rear main body shell from the left and right sides, respectively. A cutting motor and left and right two groups of front stage cutting transmission mechanisms are installed in the front main body shell, and the two groups of front stage cutting transmission mechanisms share an input gear 24. The number of idler wheels in the idler wheel set of the left and right two groups of front stage cutting transmission mechanisms is different in parity. One execution mechanism is driven on the left and right sides by the same power, so that the overall structure of the coal mining machine is more compact, and the adaptability of the short body coal mining machine to the thin seam working face is improved.

[0060] For the case where the oil cylinder containing cavity is provided, the left and right two oil cylinder containing cavities of the front main body shell are communicated, or the lower part of the front main body shell is provided with an oil cylinder containing cavity shared by the left and right sides.

[0061] Unless specifically specified, the front and rear in this article refer to the direction close to the coal wall and the direction away from the coal wall, respectively.

Claims

1. A compact swing arm for a thin coal seam mining machine, characterized in that: The system includes a swing arm housing, the main body of which is a boom extending left and right. A rear-stage cutting transmission mechanism is installed within the boom. The input and output gears of the rear-stage cutting transmission mechanism serve as the high-speed and low-speed ends of the boom, respectively. A connecting arm extending forward from the middle of the boom is provided, and a forearm extending left or right from the connecting arm is provided on the connecting arm. A rear arm is provided behind the high-speed end of the boom, and the rear arm is a cantilever structure connected to the boom at one end. The forearm and rear arm are respectively provided with a front hinge connection hole and a rear hinge connection hole, which are coaxial with the input gear. The lower part of the connecting arm has a semi-enclosed hydraulic cylinder outer cavity for accommodating the hydraulic cylinder contents mounted on the machine body. The cavity assembly forms a cylinder receiving cavity. One end of the cylinder outer receiving cavity is opposite to the machine body in the left-right direction, and the other end is sealed. The front and rear cavity walls of the cylinder outer receiving cavity are provided with cylinder pin holes for hinged height adjustment cylinders. The axis of the cylinder pin holes extends front-back. In the front-back direction, the cylinder outer receiving cavity is located at the middle and slightly forward position of the connecting arm, and the cylinder pin holes are close to the low-speed end of the boom in the left-right direction. The connecting arm extends downward beyond the bottom surface of the middle part of the boom. The left-right width of the upper middle part of the connecting arm is the narrowest, and the left-right width increases as it approaches the upper and lower ends, and the lower part is the widest, which is used to set the cylinder outer receiving cavity. The top surface of the connecting arm is a slope, and in the left-right direction, the top surface of the connecting arm is higher as it approaches the high-speed end of the boom.

2. The swing arm of the compact coal mining machine for thin coal seams as described in claim 1, characterized in that: The side of the connecting arm near the low-speed end of the boom in the left-right direction is configured as a concave arc cylindrical surface coaxial with the output gear of the subsequent cutting transmission mechanism.

3. The swing arm of the compact coal mining machine for thin coal seams as described in claim 2, characterized in that: It also includes a planetary reduction mechanism, the ring gear of which is installed at the front of the low-speed end of the boom, and the sun gear of which is coaxially connected to the output gear of the subsequent cutting transmission mechanism.

4. The swing arm of the compact coal mining machine for thin coal seams as described in claim 1, 2, or 3, characterized in that: A window is provided on the coal wall side wall of the outer cavity of the oil cylinder.

5. A swing arm support structure for a compact coal seam mining machine, characterized in that: The machine includes a front main body shell, a rear main body shell, a height adjustment cylinder, and a swing arm for a compact coal seam mining machine as described in claims 1, 2, 3, or 4. The front main body shell and the rear main body shell are connected and fixed together. The right or left edge of the front main body shell is provided with a first lug, a second lug, and a connecting base from front to back. A front groove is formed between the first lug and the second lug, and a middle groove is formed between the second lug and the connecting base. The rear main body shell includes a rear base and a third lug that extends to the right or left from the front of the rear base. A rear groove is formed between the third lug and the rear base. A front-stage cutting transmission mechanism and a cutting motor are installed inside the front main body shell. The front-stage cutting transmission mechanism includes an input gear, an idler gear set, and an output gear arranged and connected sequentially in the left and right directions. The output shaft of the cutting motor is connected to the front-stage cutting... The input gear of the transmission mechanism is coaxially connected, and the output gear of the front-stage cutting transmission mechanism is located in the connecting base. The high-speed end of the forearm, the boom, and the rear arm are respectively inserted into the front groove, the middle groove, and the rear groove. The forearm is hinged to the first and second lugs, and the rear arm is hinged to the third lug and the rear base. The output gear of the front-stage cutting transmission mechanism and the input gear of the rear-stage cutting transmission mechanism are coaxially connected and coaxial with the front hinge connection hole. The lower part of the right or left end of the front main body housing is provided with a semi-enclosed cylinder receiving cavity. The height adjustment cylinder is located in the cylinder receiving cavity composed of the cylinder outer receiving cavity and the cylinder inner receiving cavity. One end of the height adjustment cylinder is hinged to the connecting arm, and the other end is hinged to the front main body housing. The outer surfaces of the cylinder outer receiving cavity and the cylinder inner receiving cavity face each other and are spaced apart.

6. The swing arm support structure for a compact coal seam mining machine as described in claim 5, characterized in that: The input gear core of the rear cutting transmission mechanism is provided with a rear spline hole, and a spline sleeve with internal and external splines is installed in the rear spline hole. The spline hole of the spline sleeve and the spline hole of the output gear core of the front cutting transmission mechanism are simultaneously splined to a spline shaft.

7. The swing arm support structure for a compact coal mining machine in thin coal seams as described in claim 6, characterized in that: A front wear-resistant sleeve is installed in the ear hole of the first ear seat and the ear hole at the front of the second ear seat. A rear wear-resistant sleeve is installed in the ear hole of the third ear seat and the ear hole at the front of the rear base. A sliding bearing is installed in both the front hinge connection hole and the rear hinge connection hole. The sliding bearings in the front and rear hinge connection holes are respectively sleeved and installed in the middle of the front pin sleeve and the rear pin sleeve. The front and rear parts of the front pin sleeve are tightly fitted with the front wear-resistant sleeve, and the front and rear parts of the rear pin sleeve are tightly fitted with the rear wear-resistant sleeve. The inner hole of the front pin sleeve communicates with the inner hole of the second ear seat. A limit rod is installed in the two inner holes. The rear end of the limit rod extends into the rear spline hole to axially limit the front end of the spline shaft. The front part of the limit rod is positioned and fixed relative to the front pin sleeve. The remaining part of the limit rod does not contact the front pin sleeve, the inner hole of the second ear seat, or the rear spline sleeve.

8. The swing arm support structure for a compact coal mining machine in thin coal seams as described in claim 7, characterized in that: The outer surfaces of the cantilever ends of the forearm, the high-speed end of the boom, and the cantilever ends of the rear arm on the same swing arm housing are configured as a first set of convex arc cylindrical surfaces coaxial with the front hinge connection hole. Correspondingly, the front groove, middle groove, and rear groove are configured as a first set of concave arc cylindrical surfaces coaxial with the front hinge connection hole. The first set of concave arc cylindrical surfaces corresponds one-to-one with the first set of convex arc cylindrical surfaces and is spaced apart from each other. The outer surfaces of the cantilever ends of the first ear and the second ear are configured as a second set of convex arc cylindrical surfaces coaxial with the front hinge connection hole. Correspondingly, 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 hinge connection hole. The second set of convex arc cylindrical surfaces corresponds one-to-one with the second set of concave arc cylindrical surfaces and is spaced apart from each other.

9. The swing arm support structure for a compact coal mining machine in thin coal seams as described in claims 5, 6, 7, or 8, characterized in that: The left and right edges of the front main body shell are provided with the first ear seat, the second ear seat and the connecting base. The rear main body shell is provided with the two third ear seats and the rear groove. The two swing arms of the thin coal seam compact coal mining machine are respectively hinged to the left and right ends of the front main body shell and the rear main body shell from the left and right sides. The front main body shell is equipped with two sets of front-stage cutting transmission mechanisms, and the two sets of front-stage cutting transmission mechanisms share a common input end gear.

10. The swing arm support structure for a compact coal mining machine in thin coal seams as described in claim 9, characterized in that: The left and right cylinder contents of the front main body housing are connected, or the lower part of the front main body housing is provided with a shared cylinder contents cavity.

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