CN114396270A - Swing arm and swing arm support structure of thin coal seam short span shearer - Google Patents

Abstract

The invention relates to a swing arm and a swing arm supporting structure of a short-span coal mining machine for a thin coal seam, wherein the main body of a swing arm shell of the swing arm is an arm support extending left and right, the middle part of the arm support is connected with a forward-extending connecting arm, the connecting arm is provided with a front arm, the front arm is positioned in front of a high-speed end of the arm support, and the front part of the high-speed end of 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 a front pin shaft mounting hole and a rear pin shaft mounting hole which are coaxial with each other and an input end gear of a cutting transmission mechanism; the supporting structure comprises a front main body shell, a swinging arm, a cutting motor and a heightening oil cylinder, wherein the left end and the right end of the front main body shell are respectively hinged with one swinging arm by taking the cutting motor as a pin shaft, an output shaft of the cutting motor is coaxially connected with an input end gear on the left side and the right side in a transmission manner, and the heightening oil cylinder is hinged between a front arm of the swinging arm and the front main body shell. The invention has compact structure, and can provide larger mining range, realize shorter machine body length and relatively clean oil cylinder installation space.

Description

Swing arm and swing arm support structure of thin coal seam short span shearer

technical field

The invention relates to a shearer swing arm and a height-adjusting oil cylinder installation structure of the swing arm, which is especially suitable for a thin coal seam shearer, and helps to expand the mining range of the thin coal seam shearer, shorten the length of the fuselage and improve the suspension. The center of gravity of the fuselage.

Background technique

The cutting motor of the existing thin coal seam shearer is usually located on the swing arm and swings as the swing arm swings. When the rear swing arm in the traveling direction of the thin coal seam cantilevered shearer cuts the upper knife, the problem that the cutting height of the rear drum is too small will occur. The reason is that when the cutting height increases again, the cutting motor of the rear swing arm will It will interfere with the upper coal platform left after the front drum bottom cutter, so the overall mining height of this shearer is too narrow to meet the mining requirements of my country's thin coal seam working face with large changes in the thickness of the ore seam.

In response to the above problems, the industry has proposed to divide the cutting part into a swinging part and a fixed part, and set the cutting motor and the main body of the cutting transmission system on the fixed part, resulting in an overly complex structure of the fixed part, and the left and right lengths of the overhanging section of the fuselage. The length and weight are too large, and the problem of the center of gravity of the whole machine still has a great influence on the force of the whole machine.

At the same time, since the supporting oil cylinder of the existing structure is installed in an open space, coal and rock are accumulated on the upper and lower sides of the supporting oil cylinder during operation, especially the coal and rock accumulation between the supporting oil cylinder and the body shell of the shearer will limit the swing of the oil cylinder. As a result, the mining height cannot meet the theoretical mining requirements, and some even directly cut off the oil cylinder. In addition, the existing method of arranging oil cylinders in the left and right longitudinal directions of the coal shearer body further leads to the lengthening of the body, and the problem that the center of gravity of the suspension body is biased toward the coal wall is prominent.

SUMMARY OF THE INVENTION

The invention aims to provide a swing arm and swing arm support structure of a thin coal seam short span shearer, which has a compact structure, can provide a larger mining range, achieve a shorter fuselage length and a relatively clean oil cylinder installation space.

The main technical solutions of the present invention include:

A swing arm of a thin coal seam shearer comprises a swing arm shell, the main body of the swing arm shell is an arm frame extending left and right, a cutting transmission mechanism is installed in the arm frame, an input end gear of the cutting transmission mechanism and The ends of the output gears are respectively used as the high-speed end and the low-speed end of the boom. The middle of the boom is provided with a connecting arm extending forward from the boom, and the connecting arm is provided with a forearm extending left or right from the connecting arm. The forearm is located in front of the high-speed end of the boom, and the front parts of the forearm and the high-speed end of the boom are respectively provided with front pin shaft mounting holes and rear pin shafts for realizing the hinged connection of the swing arm of the thin coal seam short-span shearer with the shearer fuselage. The pin shaft installation hole, the input gear is installed at the rear of the high-speed end of the boom, the front pin shaft installation hole and the rear pin shaft installation hole are both coaxial with the input gear, and the lower part of the connecting arm is provided with a left-right extension, an opening to the left and right. The lower oil cylinder accommodating cavity is located below the forearm in the front-rear direction, and a pair of coaxial oil cylinder outer pin holes are arranged on the front and rear cavity walls of the oil cylinder accommodating cavity, and the axis of the oil cylinder outer pin holes extends back and forth.

In the height direction, the left and right width of the middle and upper part of the connecting arm is the narrowest, and the width is wider as it is closer to the upper and lower ends.

In the left-right direction, the side surface of the connecting arm close to the low-speed end of the arm frame is preferably set as a concave arc cylindrical surface coaxial with the output gear.

The connecting arm is provided with an inner cavity and communicates with the inner cavity of the arm frame, and an enhanced cooler is arranged in the inner cavity of the connecting arm.

A window may be opened on the front side cavity wall of the oil cylinder accommodating cavity.

A thin-coal seam short-span coal shearer swing arm support structure, comprising a front main body shell, a height-adjusting oil cylinder, a cutting motor and the thin coal seam short-span coal shearer swing arm, the front main body shell A first ear seat, a second ear seat and a connection base are arranged in sequence from front to back on the right edge or left edge of the ear seat. A front groove is formed between the first ear seat and the second ear seat, and the second ear seat and the connection base are formed. A rear groove is formed between them, and the high-speed ends of the forearm and the arm frame are respectively inserted into the front groove and the rear groove. In the inner hole formed by the combination of the hole, the ear hole of the second ear seat and the rear pin shaft mounting hole, the output shaft of the cutting motor is connected with the input gear coaxially, and the cutting motor is respectively opposite to the front main body shell and the swing arm shell. The body is fixedly connected and rotationally connected, the height-adjusting oil cylinder is located in the oil-cylinder accommodating cavity, one end of the height-adjusting oil cylinder is hinged on the outer pin shaft, the outer pin shaft is installed in the outer pin hole of the oil cylinder, and the other end of the height-adjusting oil cylinder is hinged on the front main body shell body.

The top surface of the middle part of the oil cylinder accommodating cavity is a concave circular arc cylindrical surface with a straight generatrix extending left and right. An elastic body is embedded and installed between the top surface of the middle part of the oil cylinder accommodating cavity and the cylinder barrel of the height-adjusting oil cylinder, and the top surface of the elastic body is installed. and the bottom surface respectively fit with the top surface of the middle part of the oil cylinder accommodating chamber and the surface of the cylinder barrel of the height-adjusting oil cylinder.

The top surface of the end of the cylinder accommodating chamber close to the low-speed end of the boom is a concave arc cylindrical surface extending forward and backward with a straight generatrix. above.

A set of bearings are respectively installed in the front pin shaft installation hole and the rear pin shaft installation hole, and the casing of the cutting motor is rotatably supported in the corresponding front pin shaft installation hole and the rear pin shaft installation hole through the bearings.

The outer surface of the overhanging end of the forearm and the outer surface of the high-speed end of the boom on the same swing arm shell are set as the first group of convex circular arc cylindrical surfaces coaxial with the front pin shaft mounting hole, and the front groove The first group of concave circular arc cylindrical surfaces and the rear groove are arranged coaxially with the front pin shaft mounting holes, and the first group of concave circular arc cylindrical surfaces and the first group of external convex circular arc cylindrical surfaces are coaxial and spaced apart from each other. There are intervals; the side surface of the connecting arm close to the high-speed end of the arm frame is set as a second group of concave circular arc cylindrical surfaces coaxial with the front pin shaft mounting hole, and the outer surface of the overhanging end of the first ear seat and the first The outer surface of the overhanging end of the two lugs is set as a second group of convex circular arc cylindrical surfaces coaxial with the front pin shaft mounting hole, and the second group of convex circular arc cylindrical surfaces is the same as the second group of concave circular arc cylindrical surfaces axis and spaced from each other.

The beneficial effects of the present invention are:

The swing arm of the present invention can be hinged with the front part of the fuselage of the shearer by using the cutting motor as a pin shaft, which shortens the left and right lengths of the front part of the fuselage, which is equivalent to shortening the left and right lengths of the suspension body of the shearer. The center of gravity of the shearer body moves to the goaf side accordingly, so that the force stability of the shearer is improved.

The swing arm of the present invention can be hinged with the front part of the shearer fuselage by using the cutting motor as a pin, and only the connecting arm swings up and down with the swing arm on the inner side of the upper drum. The flat and thin structure of the connecting arm and the special top surface The inclined surface structure makes the upper coal platform basically not affected when the swing arm shell swings up and down, so it can ensure a large mining area.

The swing arm of the present invention can be hinged with the front part of the shearer fuselage by using the cutting motor as the pin shaft, and the main deceleration part of the swing arm is acted by the planetary deceleration mechanism arranged in the drum, so the swing arm only needs to set relative A simple cutting transmission mechanism (such as a two-stage fixed-axis gear transmission mechanism) is sufficient. The shape of the boom is more regular. The cutting motor and the cutting transmission mechanism as a whole form a cutting mechanism with a simple structure and compact size in the left and right directions.

The height-adjusting oil cylinder is arranged below the cutting motor, which not only makes full use of the space between the top plate and bottom plate of the coal mining face, but also greatly shortens the left and right length of the suspension section. the distance between the two rollers. The relatively closed oil cylinder accommodating cavity provides a relatively clean working space for the swing of the height-adjusting oil cylinder and the layout of the oil cylinder pipeline, and ensures that the free expansion and contraction of the height-adjusting oil cylinder and the free swing of the swing arm shell are not affected by coal and other minerals. impact, and ultimately ensure that the maximum mining area is not affected.

The connecting arm is also provided with an inner cavity and communicates with the inner cavity of the arm frame, thereby increasing the oil storage capacity in the swing arm housing. Not only that, there is also an enhanced cooler in the inner cavity of the connecting arm, which is used to strengthen the cooling oil cavity to improve the cooling effect of the swing arm with high power density.

The forearm, as the force-bearing part that plays the main supporting role, is separated from the boom mounted with the cutting transmission mechanism, and although the front part of the high-speed end of the boom is a part of the boom, it only serves as a secondary supporting function. Therefore, it can basically ensure that the cutting transmission mechanism is in a good non-stressed state, so that the transmission accuracy can be guaranteed.

The cutting transmission mechanism and the rear pin shaft mounting holes for auxiliary support of the cutting motor are all arranged in the boom frame, which not only has a more compact structure, but also makes the power input connection point of the cutting transmission mechanism and the auxiliary support point closer to each other. , the power transmission is less affected by the beating, and the power transmission is more stable and reliable.

Description of drawings

1 is a front view of an embodiment of a swing arm support structure of the present invention;

Fig. 2 is the top sectional view of Fig. 1;

Fig. 3 is the A-A sectional view of Fig. 2;

Fig. 4 is the B-B sectional view of Fig. 2;

5 is a schematic diagram of the support structure of the swing arm when the swing arm is lifted up at a certain angle;

Fig. 6 is a working state diagram of the thin coal seam short span shearer adopting the present invention.

Reference number:

1. Swing arm; 11. Swing arm housing; 111. Forearm; 112. Front of high-speed end of boom; 113. Rear of high-speed end of boom; 114. Connecting arm; 1140. Window; 1141. Close to boom 1142. The side near the low-speed end of the boom; 1143. The inner cavity of the connecting arm; 1144. The cylinder accommodating cavity; 1146. The top surface of the end of the cylinder accommodating cavity; 12. Cutting transmission mechanism; 121. Input gear; 13. Drum; 14. Bearing;

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

3. Cutting motor;

4. Raise the cylinder; 41. Outer pin; 42. Outer surface of the hinge ear; 43. Elastomer; 44. Cylinder barrel; 45. Cylinder rod.

Detailed ways

The present invention discloses a swing arm 1 (which may be referred to as swing arm for short) of a thin coal seam shearer with short span, as shown in Figs. The extended boom has a cutting transmission mechanism 12 installed in the boom. The cutting transmission mechanism adopts a fixed-axis gear transmission mechanism. In order to easily distinguish the two ends of the boom, the input gear 121 (also the high-speed gear) and the output gear (also the low-speed gear) of the cutting transmission mechanism are used as the high-speed and low-speed ends of the boom. The middle part of the boom is provided with a connecting arm 114 extending forward from the boom, and the connecting arm is provided with a forearm 111 extending left or right from the connecting arm, that is, for the right swing arm shell of the shearer, the forearm is The connecting arm cantilevered to the left; for the left swing arm shell of the shearer, the forearm cantilevered to the right from the connecting arm. The forearm is located in front of the high-speed end of the boom, and the front part 112 of the forearm and the high-speed end of the boom are respectively provided with a front pin shaft mounting hole and a rear pin shaft mounting hole for realizing the hinged connection of the swing arm with the shearer body. The gear is mounted on the rear portion 113 of the high-speed end of the boom, and the front pin shaft mounting hole and the rear pin shaft mounting hole are both coaxial with the input gear. The front pin shaft installation hole and the rear pin shaft installation hole are used to install the cutting motor 3, and they are coaxial with the input gear to ensure that the installed cutting motor and the input gear transmit power coaxially. The swing arm is hinged to the front of the shearer fuselage through the forearm and the front of the high-speed end of the boom. The cutting motor is fixedly and rotatably connected to the body and the swing arm casing respectively, so that the hinged connection between the swing arm casing and the body is realized with the cutting motor as the pin shaft. By using the whole cutting motor as the pin shaft, the left and right lengths of the suspension body section are shortened, and the structure of the cutting mechanism is simplified. The layout of related structures such as windings and rotors inside the cutting motor can still use conventional structures.

The lower part of the connecting arm is provided with an oil cylinder accommodating cavity 1144 extending from left to right and opening downward, and the oil cylinder accommodating cavity is located below the forearm in the front-rear direction. The oil cylinder accommodating cavity is used to install the height-adjusting oil cylinder 4. During installation, most of the height-adjusting oil cylinder is located in the oil cylinder accommodating cavity. One end of the height-adjusting oil cylinder is hinged on the connecting arm, and the other end is hinged on the fuselage.

Further, a pair of coaxial oil cylinder outer pin holes are arranged on the front and rear cavity walls of the oil cylinder accommodating cavity, and the axis of the oil cylinder outer pin holes extends forward and backward and is close to the low speed end of the boom in the left and right direction. The outer pin hole of the oil cylinder is used to install the outer pin shaft 41, and the outer pin shaft is used to install the hinge ear at one end of the height-adjusting oil cylinder.

In the height direction, the left and right widths of the middle and upper parts of the connecting arms are the narrowest, and the left and right widths are wider as they are closer to the upper and lower ends, especially the lower part is wider, which is used to set the oil cylinder accommodating cavity. The entire connecting arm forms a flat and thin structure. The narrowest part of the left and right widths is preferably the same height as the front pin shaft mounting hole. The top surface of the connecting arm is an inclined surface, and one end closer to the high-speed end of the boom in the left-right direction is higher. The above-mentioned flat and thin structure and special inclined surface structure of the connecting arm make the upper coal platform basically not affected when the swing arm shell swings up and down, so a large mining range can be ensured.

In the left and right direction, the side 1142 of the connecting arm close to the low-speed end of the boom is set as a concave circular arc cylinder coaxial with the output end gear. The loading effect of the material conveyed by the roller screw.

The connecting arm is provided with an inner cavity 1143 and communicates with the inner cavity of the arm frame, thereby increasing the oil storage volume in the swing arm housing. The inner cavity 1143 of the connecting arm is provided with an enhanced cooler for strengthening the cooling oil cavity to improve the cooling effect of the swing arm with high power density. The intensified cooler may be provided with a plurality of cooling pipes, and the plurality of cooling pipes may be connected in series or in parallel.

A window 1140 is opened on the front side cavity wall of the oil cylinder accommodating cavity, so as to facilitate maintenance of the oil cylinder and the like.

The invention also discloses a swing arm support structure of a thin coal seam short span shearer, comprising a front main body shell 2, a height-adjusting oil cylinder 4, a cutting motor 3 and any one of the thin coal seam short span described above Shearer swing arm 1. A first ear seat, a second ear seat and a connecting base are arranged on the right edge or left edge of the front main body shell from front to back in sequence, and a front groove 214 is formed between the first ear seat and the second ear seat, A rear groove is formed between the second lug seat and the connection base, and the high-speed ends of the forearm and the arm frame are respectively inserted into the front groove and the rear groove, respectively, and the cutting motor is installed as a hinge pin on the first lug. In the inner hole formed by the combination of the ear hole of the seat, the installation hole of the front pin shaft, the ear hole of the second ear seat and the installation hole of the rear pin shaft, the output shaft of the cutting motor is coaxially connected with the input gear, and the cutting motor is respectively opposite to the front. The main body part casing and the swing arm casing are fixedly connected and rotatably connected.

The right or left end of the lower part of the front main body shell is provided with an inner pin hole of the oil cylinder. The shaft is respectively installed in the outer pin hole of the oil cylinder and the inner pin hole of the oil cylinder. The telescoping of the height-adjusting oil cylinder can drive the shell of the swing arm to swing up and down around the shell of the front main body. The oil cylinder accommodating cavity provides a relatively clean working space for the height adjustment of the oil cylinder, which ensures that the swing arm shell is not affected by coal and other minerals during the swinging process, and finally ensures that the maximum mining range is not affected.

The front and rear width of the oil cylinder accommodating cavity is slightly wider than the diameter of the cylinder barrel 44 of the height-adjusting oil cylinder. The middle top surface 1147 of the oil cylinder accommodating cavity is a concave arc cylindrical surface extending from left to right with a straight generatrix. The space above the cylinder barrel of the oil cylinder and below the middle top surface 1147 of the oil cylinder accommodating cavity is relatively closed, which can be used for the pipeline of the oil cylinder. layout.

An elastic body 43 may be embedded and installed between the top surface of the middle portion of the oil cylinder accommodating cavity and the cylinder barrel of the height-adjusting oil cylinder, and the elastic body may be made of a material such as a highly elastic sponge. The top surface and bottom surface of the elastomer are respectively fitted with the top surface of the middle of the cylinder accommodating chamber and the surface of the cylinder barrel of the height-adjusting cylinder, so that the elastomer fills the space above the cylinder and below the top surface of the middle of the cylinder accommodating chamber, which can prevent the coal powder from passing through. The top of the oil cylinder enters the oil cylinder accommodating cavity.

Further, the top surface 1146 of the end portion of the cylinder accommodating chamber close to the low-speed end of the boom is a concave arc cylindrical surface extending back and forth with a straight generatrix, and the top surface 1146 of the end portion is covered with the shape of the height-adjusting cylinder near the boom. The upper part of the hinge lug at the low speed end is almost in contact with the outer surface 42 of the hinge lug, which to a certain extent acts to close the outer end of the cylinder accommodating cavity, preventing coal powder from entering the cylinder accommodating cavity from the outer end of the cylinder accommodating cavity. Combined with the arrangement of the above-mentioned elastic body, the cylinder accommodating cavity, especially the space above the cylinder barrel, is relatively closed, which can effectively prevent the entry of pulverized coal and ensure that the cylinder accommodating cavity is kept relatively clean. In the embodiment shown in the drawings, the cylinder barrel 44 is connected to the connecting arm, and the cylinder rod 45 is connected to the housing of the front main body.

A set of bearings 14 are respectively installed in the front pin shaft installation holes and the rear pin shaft installation holes, and the casing of the cutting motor is rotatably supported in the corresponding front pin shaft installation holes and the rear pin shaft installation holes through the bearings. Most of the load at the hinged joint is borne by the bearing, which can well protect the swing arm shell, the body shell and the cutting motor from being affected or less, and maintain the reliability of the connection.

The cutting motor is preferably supported on the swing arm housing through a joint bearing, and the use of the joint bearing helps to maintain the concentricity between the front and rear pin shaft mounting holes and the casing of the cutting motor, and improves the cutting motor and cutting transmission. Transmission accuracy between mechanisms. A wear-reducing layer is also preferably arranged between the inner ring and the outer ring of the spherical plain bearing, which can reduce the wear of the bearing sliding pair, and the two ends of the wear-reducing layer are provided with seals, which can ensure the cleanliness of the internal friction pair and keep the inside of the bearing in good condition. The lubricating conditions, accordingly, also help to improve the transmission accuracy between the cutting motor and the cutting transmission mechanism.

The outer surface of the overhanging end of the forearm and the outer surface of the high-speed end of the boom on the same swing arm shell are set as the first group of convex circular arc cylindrical surfaces coaxial with the front pin shaft mounting hole, and the front groove 214 and the rear groove are arranged as the first group of concave circular arc cylindrical surfaces coaxial with the front pin shaft mounting hole, and the first group of concave circular arc cylindrical surfaces and the first group of external convex circular arc cylindrical surfaces are coaxial and mutually spaced. Leave space; the side surface 1141 of the connecting arm close to the high-speed end of the arm frame is set as a second group of concave circular arc cylindrical surfaces coaxial with the front pin shaft mounting hole, and the outer surface of the overhanging end of the first ear seat and the outer surface of the overhanging end of the second lug seat is set as a second group of convex circular arc cylindrical surfaces coaxial with the front pin shaft mounting hole, the second group of convex circular arc cylindrical surfaces and the second group of concave circular arc cylindrical surfaces The faces are coaxial and spaced from each other. By controlling the size of the corresponding interval within an appropriate range, coal and rock accumulation can be effectively controlled to enter between the swing arm casing and the front main body casing during the swinging process of the swing arm casing relative to the front main body casing.

The rear groove is a stepped groove, wherein 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 arranged in a stepped shape.

Unless otherwise specified, the front and rear mentioned in this article refer to the direction close to the coal wall and the direction away from the coal wall, respectively.

Claims (10)

1. a thin coal seam short-span shearer swing arm, characterized in that: comprising a swing arm housing, the main body of the swing arm housing is a boom extending left and right, and a cutting transmission mechanism is installed in the boom, The ends of the input gear and the output gear of the cutting transmission mechanism are respectively used as the high-speed end and the low-speed end of the boom. The middle of the boom is provided with a connecting arm extending forward from the boom. Left or right cantilevered forearm, the forearm is located in front of the high-speed end of the boom, the forearm and the front of the high-speed end of the boom are respectively provided with a swing arm for realizing the thin coal seam short-span shearer with the shearer body The hinged front pin shaft mounting hole and the rear pin shaft mounting hole, the input end gear is installed at the rear of the high-speed end of the boom, the front pin shaft mounting hole and the rear pin shaft mounting hole are both coaxial with the input end gear, the connecting arm The lower part of the cylinder is provided with an oil cylinder accommodating cavity extending from left to right and opening downward. The oil cylinder accommodating cavity is located below the forearm in the front-rear direction. The front and rear cavity walls of the oil cylinder accommodating cavity are provided with a pair of coaxial cylinder outer pin holes, The axis extends forward and backward. 2. The thin coal seam short-span shearer swing arm according to claim 1, characterized in that: in the height direction, the middle and upper part of the connecting arm have the narrowest left and right width, and the closer the upper and lower ends are, the wider the left and right width, so The top surface of the connecting arm is an inclined surface, and the end near the high-speed end of the boom in the left-right direction is higher. 3. The thin coal seam short-span shearer swing arm according to claim 2, characterized in that: in the left-right direction, the side surface of the connecting arm close to the low-speed end of the arm frame is arranged as a concave concave coaxial with the output end gear Arc cylinder. 4. The thin coal seam short-span shearer swing arm according to claim 3, wherein the connecting arm is provided with an inner cavity and communicates with the inner cavity of the boom, and the inner cavity of the connecting arm is provided with an inner cavity. Enhanced cooler. 5 . The short-span shearer swing arm for thin coal seams according to claim 1 , wherein a window is opened on the front side cavity wall of the oil cylinder accommodating cavity. 6 . 6. A thin-coal seam short-span shearer swing arm support structure, characterized in that it comprises a front main body shell, a height-adjusting oil cylinder, a cutting motor and the one described in claim 1, 2, 3, 4 or 5. The swing arm of the thin coal seam short-span shearer, the right edge or the left edge of the front main body shell is sequentially provided with a first ear seat, a second ear seat and a connection base from front to back, and the first ear seat is connected to the first ear seat and the third ear seat. A front groove is formed between the two lugs, a rear groove is formed between the second lug and the connecting base, and the high-speed ends of the forearm and the boom are respectively inserted into the front groove and the rear groove. As a hinge pin, it is installed in the inner hole formed by the combination of the ear hole of the first ear seat, the front pin shaft installation hole, the ear hole of the second ear seat and the rear pin shaft installation hole. The output shaft of the cutting motor is the same as the input gear. Shaft drive connection, the cutting motor is fixedly connected and rotatably connected to the front main body casing and the swing arm casing respectively, the height adjustment oil cylinder is located in the oil cylinder accommodating cavity, one end of the height adjustment oil cylinder is hinged on the outer pin shaft, and the outer pin shaft is installed In the outer pin hole of the oil cylinder, the other end of the height-adjusting oil cylinder is hinged on the casing of the front main body. 7 . The thin coal seam short-span shearer swing arm support structure according to claim 6 , wherein the top surface of the middle part of the oil cylinder accommodating cavity is a concave arc cylindrical surface with a straight generatrix extending left and right, and the oil cylinder accommodates An elastic body is embedded and installed between the top surface of the middle part of the cavity and the cylinder barrel of the height-adjusting oil cylinder. 8 . The thin coal seam short-span shearer swing arm support structure according to claim 7 , wherein the top surface of the end of the oil cylinder accommodating cavity close to the low-speed end of the boom is an inner concave circle extending back and forth with a straight generatrix. 9 . The arc cylindrical surface, and the top surface of the end is covered over the hinge ear of the height-adjusting oil cylinder close to the low-speed end of the boom. 9. The thin coal seam short-span shearer swing arm support structure according to claim 6, 7 or 8, characterized in that: a set of bearings is installed in the front pin shaft mounting hole and the rear pin shaft mounting hole respectively, and the cutting The housing of the motor is rotatably supported in the corresponding front pin shaft mounting holes and rear pin shaft mounting holes through the bearings. 10. The thin coal seam short-span shearer swing arm support structure according to claim 9, characterized in that: the outer surface of the overhanging end of the forearm and the outer surface of the high-speed end of the boom on the same swing arm shell A first group of convex circular arc cylindrical surfaces are arranged coaxial with the front pin shaft mounting hole, and the front groove and rear groove are arranged as a first group of inner concave circular arc cylindrical surfaces coaxial with the front pin shaft mounting hole , the first group of concave circular arc cylindrical surfaces and the first group of external convex circular arc cylindrical surfaces are coaxial and spaced apart from each other; the side of the connecting arm close to the high-speed end of the boom is set to be the same as the front pin shaft mounting hole The second group of concave arc cylindrical surfaces of the shaft, the outer surface of the overhanging end of the first ear seat and the outer surface of the overhanging end of the second ear seat are arranged as a second group of outer surfaces coaxial with the front pin shaft mounting hole The convex circular arc cylindrical surface, the second group of the outer convex circular arc cylindrical surface and the second group of the inner concave circular arc cylindrical surface are coaxial and spaced apart from each other.

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