Thin coal seam coal cutter cutting mechanism

Abstract

The present application relates to a kind of thin coal seam coal cutter cutting mechanism, its swing arm shell and main part shell are hinged with cutting motor as pin shaft, cutting motor is fixed relative to main part shell, the main part of swing arm shell is left and right extension's arm support, the middle part of arm support is equipped with the connecting arm that suspends from arm support forward, connecting arm is equipped with forward arm and rear arm that suspend left or right, forward arm, rear arm and the high speed end of arm support are sequentially spaced from front to back, forward arm and rear arm and the first to third lug of the front part of main part shell form hinged, load from drum is transmitted to main part shell, the input end gear of cutting transmission mechanism installed in the high speed end of arm support is coaxially driven connection with the output shaft of cutting motor, height-adjusting oil cylinder is arranged in the front inner cavity of main part shell, and two ends are hinged with forward arm and main part shell respectively.The present application can provide larger mining range, also can shorten machine body, improve the problem of coal cutter gravity center.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of coal winning machine cutting mechanism, especially applicable to thin coal seam coal winning machine, can provide larger mining range and larger cutting power for thin coal seam coal winning machine. BACKGROUND

[0002] On the existing thin coal seam coal winning machine, cutting motor is usually located on rocker arm, and swings with rocker arm swing.When the rear rocker arm of the travel direction of this thin coal seam suspension body coal winning machine is equipped with knife, the problem of rear drum mining height is too small, because when mining height increases, rear rocker arm cutting motor will interfere with the upper coal table left after front drum cutting bottom knife, therefore the overall mining height of this coal winning machine is too narrow, cannot adapt to the mining requirement of large thickness variation of thin coal seam working face in our country.

[0003] In view of the above problems, the industry has proposed that the cutting part is a swing part and a fixed part, and the cutting motor and the main part of the cutting transmission system are arranged in the fixed part, resulting in that the structure of the fixed part is too complex, the length of the body suspension section is too long, the weight is too large, and the gravity center of the whole machine still has a great influence on the stress of the whole machine. Moreover, the long body structure of the coal winning machine cannot perform the straight pushing knife process similar to the short wall coal winning machine, and the time of two end inclined cutting is long, which has certain restriction on the mining efficiency. SUMMARY

[0004] The present application aims to provide a kind of thin coal seam coal winning machine cutting mechanism, which can provide larger mining range and shorten body, improve the gravity center problem of coal winning machine.

[0005] The main technical scheme of the present application is as follows:

[0006] A kind of thin coal seam coal winning machine cutting mechanism, including cutting motor, swing arm shell and main part shell, swing arm shell and main part shell are hinged with the cutting motor as the pivot, and cutting motor is fixed relative to main part shell.

[0007] The main body of the swing arm housing is a left and right extending arm support, a cutting transmission mechanism is installed in the arm support, the input end gear and the output end gear of the cutting transmission mechanism are respectively used as the high speed end and the low speed end of the arm support, a connecting arm is suspended from the arm support to the front, a front arm and a rear arm are suspended from the connecting arm to the left or to the right, the front arm, the rear arm and the high speed end of the arm support are sequentially and spacedly arranged from front to back, the front arm and the rear arm are respectively provided with a front pin shaft mounting hole and a rear pin shaft mounting hole, the front pin shaft mounting hole and the rear pin shaft mounting hole are coaxial with the input end gear of the cutting transmission mechanism, the left edge or the right edge of the front part of the main body housing is sequentially provided with a first lug, a second lug and a third lug 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 third lug, a rear groove is formed between the third lug and the rear part of the main body housing, the front arm, the rear arm and the high speed end of the arm support are correspondingly inserted into the front groove, the middle groove and the rear groove, the shell of the cutting motor is installed in the inner hole formed by the lug hole of the first lug, the front pin shaft mounting hole, the lug hole of the second lug, the rear pin shaft mounting hole and the lug hole of the third lug, and the output shaft of the cutting motor is coaxially and drivingly connected with the input end gear of the cutting transmission mechanism.

[0008] The thin seam coal mining machine cutting mechanism is further provided with a clutch mechanism, the output shaft of the cutting motor is a hollow shaft, the core shaft of the clutch mechanism passes through the output shaft of the cutting motor, when the clutch mechanism is in the engaged position, the front spline shaft segment and the rear spline shaft segment of the core shaft are respectively spline-coupled with the motor spline hole of the hollow shaft and the spline hole of the spline sleeve installed on the core part of the input end gear.

[0009] The connecting arm is a flat and thin structure with a left and right width smaller than an upper and lower height, and the top surface of the connecting arm is an inclined surface, 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 directions.

[0010] The shell of the cutting motor is rotatably supported in the front pin shaft mounting hole and the rear pin shaft mounting hole by bearings.

[0011] The bearing preferably adopts a joint bearing, an anti-friction layer is arranged between the inner ring and the outer ring of the joint bearing, and seals are arranged at both ends of the anti-friction layer.

[0012] The shell of the cutting motor adopts a thick wall structure, the surface of the shell is sequentially and spacedly provided with a first circular convex stop, a second circular convex stop, a third circular convex stop and a fourth circular convex stop from front to back, the rear part of the first lug, the front part of the second lug, the rear end of the second lug and the third lug are respectively provided with a first circular concave stop, a second circular concave stop, a third circular concave stop and a fourth circular concave stop, and the first to fourth circular convex stops and the first to fourth circular concave stops are one-to-one corresponding and tightly fitted.

[0013] The thin seam coal cutter cutting mechanism further comprises a cover plate and a height adjustment oil cylinder, the cover plate is installed at the front end opening of the main body shell, the front arm, the main body shell, the cutting motor and the cover plate jointly form a closed cavity, the height adjustment oil cylinder is located in the closed cavity, and two ends of the height adjustment oil cylinder are respectively hinged to the front arm and the main body shell.

[0014] The inner cavity of the arm support further comprises an intermediate gear and a gear pump, the input end gear is externally engaged with the intermediate gear, and the intermediate gear is coaxially connected with the gear pump.

[0015] The middle part of the arm support is provided with a rear protruding bump structure, and the internal cavity of the bump structure is an auxiliary cavity which is part of the inner cavity of the arm support.

[0016] The connecting arm is provided with an inner cavity which is communicated with the inner cavity of the arm support, and a plurality of series reinforced coolers are arranged in the inner cavity of the connecting arm.

[0017] The present application has the following advantages:

[0018] In the present application, the cutting motor is used as the pin shaft for hinging the swing arm shell and the main body shell, which shortens the length of the main body shell and the length of the coal cutter suspension body section, and simplifies the structure of the cutting mechanism.

[0019] In the present application, the high-speed end of the front arm, the rear arm and the arm support is arranged in a specific structure from front to back, the front arm and the rear arm are stress parts, and the high-speed end of the arm support is a non-stress part, so that the transmission part in the arm support is in a good non-stress state, thereby improving the transmission accuracy.

[0020] The cutting motor is supported on the front arm and the rear arm through the joint bearing, the concentricity between the front and rear pin shaft mounting holes and the shell of the cutting motor is maintained, and the transmission accuracy between the cutting motor and the cutting transmission mechanism is improved. The wear-reducing layer is arranged between the inner ring and the outer ring of the joint bearing, the wear of the sliding pair of the bearing is reduced, the sealing is arranged at both ends of the wear-reducing layer, the bearing interior is kept in good lubrication condition, and correspondingly, the transmission accuracy between the cutting motor and the cutting transmission mechanism is improved.

[0021] The front and rear two sets of cooperating stop structures between the main body shell and the cutting motor help to balance the stress of the swing arm shell. The front arm and the rear arm are respectively located between a pair of stop structures, the stress of the front arm and the rear arm is better balanced, the reliability of the installation between the cutting motor and the main body shell and the reliability of the hinged connection between the swing arm shell and the main body shell are improved.

[0022] The forearm, the main body part shell, the cutting motor and the cover plate jointly form a closed cavity, which provides a clean working space for the height-adjusting oil cylinder, ensures that the swing arm is not affected by coal and other mining materials during the swing process with the extension and retraction of the height-adjusting oil cylinder, and provides a guarantee for the normal swing of the swing arm between the highest and lowest limit swing angle positions, and finally ensures that the maximum mining range is not affected.

[0023] The input end gear not only drives other parts of the cutting transmission mechanism to rotate, but also drives the intermediate gear and the gear pump to rotate. The intermediate gear and the gear pump constitute a power source of a hydraulic system, and the power of the hydraulic system comes from the cutting motor, and an independent power source does not need to be additionally arranged.

[0024] The arrangement of the auxiliary cavity not only increases the oil cavity of the boom, but also increases the strength of the shell of the boom.

[0025] The connecting arm is also provided with an inner cavity, which is communicated with the inner cavity of the boom, and the oil storage volume in the shell of the swing arm is increased. Furthermore, a plurality of series reinforced coolers are arranged in the inner cavity of the connecting arm, which are used for reinforcing the cooling of the oil cavity, so as to improve the cooling effect of the high-power density swing arm. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a front view of an embodiment of the present application;

[0027] Figure 2 It is a top view of an embodiment of the present application;

[0028] Figure 3 It is Figure 1 a front view of an assembly composed of the swing arm shell, the drum and the cutting transmission mechanism and the like mounted thereon in

[0029] Figure 4 It is Figure 3 a top view of an embodiment of the present application;

[0030] Figure 5 It is a schematic view of an embodiment of the cutting motor;

[0031] Figure 6 It is Figure 2 an A-A sectional view of an embodiment of the present application;

[0032] Figure 7 It is a schematic view of a double-swing-arm thin coal seam coal mining machine using the cutting mechanism of the present application;

[0033] Figure 8 It is Figure 7 a top view of an embodiment of the present application.

[0034] REFERENCE SIGNS:

[0035] 1. swing arm housing; 111. front arm; 1111. outer surface of the overhanging end of the front arm; 112. rear arm; 113. arm bracket; 1131. high speed end of the arm bracket; 114. connecting arm; 1141. side near the high speed end of the arm bracket; 1142. side near the low speed end of the arm bracket; 115. auxiliary cavity; 12. cutting transmission mechanism; 121. input gear; 122. planetary reduction mechanism; 123. intermediate gear; 13. drum; 14. bearing; 15. mandrel; 16. intensifier cooler; 17. gear pump;

[0036] 2. main body housing; 211. first concave stop; 212. second concave stop; 213. third concave stop; 214. fourth concave stop; 215. outer surface of the overhanging end of the first lug; 216. top and bottom edges of the opening; 22. closed cavity; 23. cover plate;

[0037] 3. cutting motor; 31. first convex stop; 32. second convex stop; 33. third convex stop; 34. fourth convex stop;

[0038] 4. height adjustment cylinder. DETAILED DESCRIPTION

[0039] The present application discloses a thin seam coal mining machine cutting mechanism (may be referred to as cutting mechanism for short), as shown in Figures 1-8 The cutting mechanism comprises a cutting motor 3, a swing arm housing 1 and a main body housing 2, the swing arm housing and the main body housing are hinged with the cutting motor 3 as a pin shaft, the cutting motor is fixed relative to the main body housing and swings relative to the swing arm housing. By taking the cutting motor as a whole pin shaft, the left and right lengths of the main body housing are shortened, which is equivalent to shortening the left and right lengths of the coal mining machine suspension body section, and the structure of the cutting mechanism is simplified.

[0040] The main body of the swing arm housing is a left and right extending arm support 113, and a cutting transmission mechanism 12 is installed in the arm support. The cutting transmission mechanism adopts a fixed shaft gear transmission mechanism. In order to distinguish the two ends of the arm support, the input end gear 121 (also the high speed end gear) and the output end gear (also the low speed end gear) of the cutting transmission mechanism are respectively taken as the high speed end and the low speed end of the arm support. A connecting arm 114 is provided in the middle of the arm support and suspends forward from the arm support. A front arm 111 and a rear arm 112 are provided on the connecting arm and suspend leftward or rightward from the connecting arm. The front arm, the rear arm and the high speed end 1131 of the arm support are parallel to each other and are sequentially and spaced apart from front to back. That is, for the right swing arm housing of the coal mining machine, the front arm and the rear arm suspend leftward from the connecting arm. For the left swing arm housing of the coal mining machine, the front arm and the rear arm suspend rightward from the connecting arm. The front arm and the rear arm are respectively provided with a front pin shaft mounting hole and a rear pin shaft mounting hole, and the front pin shaft mounting hole and the rear pin shaft mounting hole are coaxial with the input end gear of the cutting transmission mechanism. The front pin shaft mounting hole and the rear pin shaft mounting hole are used for mounting a cutting motor, and the coaxial arrangement of the front pin shaft mounting hole and the rear pin shaft mounting hole with the input end gear mounting hole can ensure that the cutting motor is coaxial with the input end gear after installation to transmit power. The left edge or the right edge of the front part of the main body housing is sequentially provided with a first lug, a second lug and a third lug from front to back. The first lug and the second lug form a front groove, the second lug and the third lug form a middle groove, and the third lug and the rear part of the main body housing form a rear groove. The front arm, the rear arm and the high speed end of the arm support are correspondingly inserted into the front groove, the middle groove and the rear groove. The shell of the cutting motor is mounted in the inner hole formed by the lug hole of the first lug, the front pin shaft mounting hole, the lug hole of the second lug, the rear pin shaft mounting hole and the lug hole of the third lug. The output shaft of the cutting motor is coaxially connected with the input end gear 121 of the cutting transmission mechanism.

[0041] The coal mining machine drum 13 and the planetary reduction mechanism 122 are both installed at the low speed end of the arm support, and the planetary reduction mechanism is located in the core of the drum. The planetary reduction mechanism undertakes most of the reduction work, so the cutting transmission mechanism as a front stage reduction part adopts a relatively simple fixed shaft gear transmission mechanism to meet the reduction requirement, and the outer shape of the arm support for accommodating the cutting transmission mechanism is more regular.

[0042] The external load force received by the drum is transmitted to the main body housing through the connecting arm, the front arm and the rear arm. The front arm and the rear arm are force receiving parts, and the high speed end of the arm support is a non-force receiving part. The force receiving part and the non-force receiving part are separated, which can ensure that the transmission part located in the arm support is in a good non-force state, thereby helping to improve the transmission accuracy.

[0043] The thin seam coal cutter cutting mechanism is further provided with a clutch mechanism, the output shaft of the cutting motor is a hollow shaft, and the core shaft 15 of the clutch mechanism penetrates the output shaft of the cutting motor. When the clutch mechanism is in the "engaged" position (i.e. the clutch mechanism is in the position for driving), the front spline shaft section and the rear spline shaft section of the core shaft are respectively in spline connection with the motor spline hole of the hollow shaft and the spline hole of the spline sleeve installed on the input end gear core. When the clutch mechanism is pulled out to the rear to be in the disengaged position, the above-mentioned first spline connection is completely disconnected, the second spline connection is mostly disconnected, and a part of the second spline connection still remains connected. The spline connection structure of the floating type connection between the output shaft of the cutting motor and the core shaft of the clutch mechanism helps to improve the transmission precision between the cutting motor and the cutting transmission mechanism, maintain the concentricity of the related structures, and facilitate the machining and manufacturing.

[0044] The connecting arm is a flat and thin structure with a left-right width smaller than an up-down height, and a top surface of the connecting arm is an inclined surface, and the top surface of the connecting arm in the left-right direction is higher closer to the high-speed end of the arm frame. The connecting arm with the above structure has little influence on the coal table above during the up-down swinging of the swinging arm shell, and finally makes the mining range of the whole swinging arm very large. The left and right side surfaces of the connecting arm are both set as concave circular arc cylindrical surfaces, wherein the side surface 1141 close to the high-speed end of the arm frame is further preferably set as a concave circular arc cylindrical surface coaxial with the front pin shaft mounting hole, and the side surface 1142 close to the low-speed end of the arm frame is further preferably set as a concave circular arc cylindrical surface coaxial with the output end gear. The overhanging end outer surface 1111 of the front arm is preferably set as an outer convex circular arc cylindrical surface coaxial with the front pin shaft mounting hole, and the groove bottom of the front groove is set as an open structure communicating with the inner cavity of the main body shell. The top and bottom edges 216 of the opening are both set as concave circular arc cylindrical surfaces coaxial with the ear hole of the second ear seat, and the overhanging end outer surface 1111 of the front arm is coaxially slidingly fitted with the top and bottom edges. The above structure design of the front arm and the front groove can ensure the relative swinging of the two and also keep the cleaning of the inner cavity of the main body shell. The overhanging end outer surfaces 215 of the first ear seat and the second ear seat are preferably set as outer convex circular arc cylindrical surfaces coaxial with the ear hole of the second ear seat, and maintain uniform gaps with the side surface 1141 of the connecting arm close to the high-speed end of the arm frame.

[0045] The shell of the cutting motor is rotatably supported in the front pin shaft mounting hole and the rear pin shaft mounting hole by bearings 14. Most of the load at the hinge is borne by the bearings, which can well protect the swinging arm shell, the main body shell and the cutting motor from being affected or less affected, and maintain the connection reliability.

[0046] The bearing adopts a spherical plain bearing, which has large load capacity, impact resistance, corrosion resistance, wear resistance and self-aligning. The adoption of the spherical plain bearing helps to maintain the concentricity between the front and rear pin shaft mounting holes and the shell of the cutting motor.

[0047] The inner ring and the outer ring of the joint bearing are further provided with an anti-friction layer to reduce the wear of the sliding pair of the bearing. The anti-friction layer is made of a material with low friction coefficient such as polytetrafluoroethylene. The two ends of the anti-friction layer are preferably provided with a seal. By using the joint bearing, the service life of the sliding pair can be improved, and the transmission accuracy between the cutting motor and the cutting transmission mechanism can also be improved.

[0048] The shell of the cutting motor is preferably of a thick wall structure, and the surface of the shell is sequentially and spacedly provided with a first circular convex notch 31, a second circular convex notch 32, a third circular convex notch 33 and a fourth circular convex notch 34 from front to back. The first and second circular convex notches form a front group of convex notch structures, and the third and fourth circular convex notches form a rear group of convex notch structures.

[0049] The rear of the first ear seat, the front of the second ear seat, the rear end of the second ear seat and the third ear seat are respectively provided with a first circular concave notch 211, a second circular concave notch 212, a third circular concave notch 213 and a fourth circular concave notch 214, and the first to fourth circular convex notches and the first to fourth circular concave notches are in one-to-one corresponding close fit. The first and second circular concave notches form a front group of concave notch structures, and the third and fourth circular concave notches form a rear group of concave notch structures. The front and rear groups of concave notch structures cooperate with the front and rear groups of convex notch structures respectively to realize the fixed connection of the cutting motor and the front main body shell. At the same time, the cooperation of the front and rear groups of notch structures helps to balance the stress of the swing arm shell. The front arm and the rear arm are respectively between a pair of notches, which also better balances the stress of the front arm and the rear arm.

[0050] The first to fourth convex notches are all provided with a sealing groove, and a sealing ring is arranged in the sealing groove.

[0051] The diameters of the notches are preferably gradually reduced from front to back, which is more convenient for the installation of the cutting motor.

[0052] The thin seam coal mining machine cutting mechanism can further include a cover plate 23 and a height adjustment oil cylinder 4. The cover plate is installed at the open front end face of the main body shell. The front arm, the main body shell, the cutting motor and the cover plate jointly form a closed cavity 22. The closed cavity provides a clean working space for the height adjustment oil cylinder, ensures that the swing arm is not affected by coal and other mining materials during the swinging process with the extension and retraction of the height adjustment oil cylinder, and provides a guarantee for the normal swinging of the swing arm between the highest and lowest limit swing angle positions, finally ensures that the maximum mining range is not affected. The height adjustment oil cylinder is located in the closed cavity, and the two ends of the height adjustment oil cylinder are respectively hinged to the front arm and the main body shell. The extension and retraction of the height adjustment oil cylinder drives the front arm to swing around the cutting motor, and then drives the swing arm shell to swing up and down.

[0053] The inner cavity of the boom is also provided with an intermediate gear 123 and a gear pump 17. The input gear is in external engagement with the intermediate gear, and the intermediate gear is coaxially connected with the gear pump. The input gear is driven to rotate by the cutting motor. In addition to driving other parts of the cutting transmission mechanism to rotate, the input gear also drives the intermediate gear and the gear pump to rotate. The intermediate gear and the gear pump constitute a power source of a hydraulic system. The power of the hydraulic system comes from the cutting motor, and an independent power source does not need to be additionally arranged.

[0054] The middle part of the boom is provided with a rearward protruding bulge structure. The inner cavity of the bulge structure is an auxiliary cavity 115. The auxiliary cavity is part of the inner cavity of the boom. The auxiliary cavity not only increases the oil cavity of the boom, but also increases the shell strength of the boom.

[0055] The connecting arm is also provided with an inner cavity, which is in communication with the inner cavity of the boom. The inner cavity of the connecting arm increases the oil storage volume in the shell of the swing arm. A plurality of series reinforced coolers 16 are arranged in the inner cavity of the connecting arm for reinforcing the cooling of the oil cavity, so as to improve the cooling effect of the high-power-density swing arm.

[0056] Unless specifically specified, the front and back directions mentioned herein refer to the direction close to the coal wall and the direction away from the coal wall, respectively.

Claims

1. A thin seam shearer cutting mechanism characterised by: The utility model provides a cutting machine, including cutting motor, swing arm shell and main part shell, swing arm shell and main part shell hinge with cutting motor as pin shaft, cutting motor is fixed relative to main part shell, the main part of swing arm shell is left and right extension's arm support, and cutting transmission mechanism is installed in arm support, and the end where input end gear and output end gear of cutting transmission mechanism are located is as high speed end and low speed end of arm support respectively, and the middle part of arm support is equipped with the connecting arm that suspends from arm support to front, and the front arm and rear arm that suspend from connecting arm to left or right are equipped on connecting arm, and the high speed end of front arm, rear arm and arm support are parallel and are arranged in sequence in front and back, and front pin shaft mounting hole and rear pin shaft mounting hole are equipped on front arm and rear arm respectively, and front pin shaft mounting hole and rear pin shaft mounting hole are coaxial with input end gear of cutting transmission mechanism, and the left edge or right edge of the front of main part shell is equipped with first lug, second lug and third lug in sequence from front to back, and front recess is formed between first lug and second lug, and middle recess is formed between second lug and third lug, and rear recess is formed between third lug and rear of main part shell, and the high speed end of front arm, rear arm and arm support are inserted in front recess, middle recess and rear recess correspondingly, and the shell of cutting motor is installed in the inner hole formed by lug hole of first lug, front pin shaft mounting hole, lug hole of second lug, rear pin shaft mounting hole and lug hole of third lug combination, and the output shaft of cutting motor is coaxial transmission connection with input end gear of cutting transmission mechanism, and the shell of cutting motor adopts thick wall structure, and the first circular convex stop, second circular convex stop, third circular convex stop and fourth circular convex stop are arranged in sequence and are spaced apart from front to back on the surface of shell, and the rear of first lug, the front of second lug, the rear end of second lug and third lug are provided with the first circular concave stop, second circular concave stop, third circular concave stop and fourth circular concave stop respectively, and the first to fourth circular convex stop and the first to fourth circular concave stop are one-to-one corresponding tight fit, and the shell of cutting motor is rotatably supported in front pin shaft mounting hole and rear pin shaft mounting hole through bearing.

2. A thin seam shearer cutting mechanism as claimed in claim 1 wherein: Further equipped with the clutch mechanism, the output shaft of cutting motor is hollow shaft, and the core shaft of clutch mechanism passes through the output shaft of cutting motor, and when clutch mechanism is in the position of engagement, the front spline shaft segment and rear spline shaft segment of core shaft are respectively coupled with the motor spline hole of hollow shaft and the spline hole of spline sleeve installed in the core part of input end gear.

3. A thin seam shearer cutting mechanism as claimed in claim 1 wherein: The connecting arm is the flat thin structure with the left and right width less than the upper and lower height, and the top surface of connecting arm is inclined surface, and the top surface of connecting arm is higher in left and right direction closer to the high speed end of arm support.

4. A thin seam shearer cutting mechanism as claimed in claim 1, 2 or 3 wherein: The bearing adopts joint bearing, and the inner ring and outer ring of joint bearing are provided with wear-reducing layer, and the both ends of wear-reducing layer are provided with seal.

5. A thin seam shearer cutting mechanism as claimed in claim 1, 2 or 3 wherein: Further including cover plate and height adjustment oil cylinder, cover plate is installed at the open end of front end surface of main part shell, and the front arm, main part shell, cutting motor and cover plate form closed cavity together, and height adjustment oil cylinder is located in the closed cavity, and the both ends of height adjustment oil cylinder are hinged on front arm and main part shell respectively.

6. A thin seam shearer cutting mechanism as claimed in claim 1, 2 or 3 wherein: The inner cavity of arm support is further provided with intermediate gear and gear pump, and input end gear is externally engaged with intermediate gear, and intermediate gear is coaxially connected with gear pump.

7. A thin seam shearer cutting mechanism as claimed in claim 5 wherein: The middle part of the arm support is provided with a rearward protruding bump structure, and the internal cavity of the bump structure is an auxiliary cavity which is a part of the internal cavity of the arm support.

8. A thin seam shearer cutting mechanism as claimed in claim 5 wherein: The connecting arm extends downward beyond the bottom surface of the middle part of the arm support, is provided with an internal cavity which is communicated with the internal cavity of the arm support, and is provided with a plurality of series reinforced coolers in the internal cavity.

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