Thin seam compact coal cutter cutting mechanism

Abstract

The present application relates to a kind of thin coal seam compact type coal cutter cutting mechanism, including swing arm shell and the machine body of the front and rear main part shell being composed of front and rear butt joint and fixed, the main body of swing arm shell is the arm support extending left and right, the connecting arm of forward overhanging is equipped in arm support middle part, left and right outer extension is equipped on connecting arm, rear arm is equipped with the rear of arm support, rear stage cutting transmission mechanism is installed in arm support, front arm and rear arm are respectively hinged with front and rear main part shell, front stage cutting transmission mechanism and cutting motor are installed in front main part shell, the output shaft of cutting motor is coaxial transmission connection with the input end gear of front stage cutting transmission mechanism, the output end gear of front stage cutting transmission mechanism is coaxial transmission connection with the input end gear of rear stage cutting transmission mechanism, oil cylinder two ends are respectively hinged with the lower part of connecting arm and the lower part of front main part shell.The present application can provide larger mining range, 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 suitable for thin coal seam coal winning machine, help to expand the scope of mining and shorten the body. BACKGROUND

[0002] On the existing thin coal seam coal winning machine, cutting motor is usually located on the swing arm, and swings with the swing arm. When the rear swing arm of the direction of travel of this thin coal seam suspension body coal winning machine picks up the knife, the problem of the rear drum mining height is too small will appear, because when the mining height increases, the rear swing arm cutting motor will interfere with the upper coal table left after the front drum cutting bottom knife, therefore the overall mining height of this coal winning machine is too narrow, cannot adapt to the mining requirements of the 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, which leads to the structure of the fixed part being too complex, the length of the left and right of the machine body suspension section being too long, the weight being too large, and the center of gravity of the whole machine still having a great influence on the stress of the whole machine. Moreover, the structure of the driving oil cylinder of the swing arm arranged on the left or right side of the cutting motor on the machine body makes the machine body too long, and the long machine body structure of the coal winning machine cannot perform the straight pushing-in knife process similar to the shortwall coal winning machine, and the time of two-end oblique cutting-in knife is longer, which has certain restriction on the mining efficiency. SUMMARY

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

[0005] The main technical solutions of the present application are as follows:

[0006] The cutting mechanism of the thin seam compact coal mining machine comprises a swing arm shell, a front main body shell and a rear main body shell, the front main body shell and the rear main body shell are connected and fixed in front and back, the right edge or the left edge of the front main body shell is sequentially provided with a first lug, a second lug and a connecting base from front to back, the first lug and the second lug form a front groove, the second lug and the connecting base form a middle groove, the rear main body shell comprises a rear base and a third lug which is suspended from the middle part of the rear base to the right or to the left, the third lug and the rear base form a rear groove, a front-stage cutting transmission mechanism and a cutting motor are installed in the front main body shell, the front-stage cutting transmission mechanism comprises input end gears, idler gears and output end gears which are sequentially arranged and sequentially transmission connected in left and right directions, the output shaft of the cutting motor is coaxially transmission 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, the main body of the swing arm shell is an arm support which extends left and right, a rear-stage cutting transmission mechanism is installed in the arm support, the end where the input end gears and the output end gears of the rear-stage cutting transmission mechanism are located are respectively called the high-speed end and the low-speed end of the arm support, the middle part of the arm support is provided with a connecting arm which is suspended from the arm support to the front, the connecting arm is provided with a front arm which is suspended from the connecting arm to the left or to the right, the rear of the high-speed end of the arm support is provided with a rear arm, the rear arm is a cantilever structure which is connected to the arm support at one end, the front arm, the high-speed end of the arm support and the rear arm are respectively embedded in 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, the output end gears of the front-stage cutting transmission mechanism and the input end gears of the rear-stage cutting transmission mechanism are coaxially transmission connected, and the axis thereof is coaxial with the hinge axis of the front and rear hinges.

[0007] The rear-stage cutting transmission mechanism is provided with a rear-stage spline hole in the core part of the input end gears, 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 spline holes of the core part of the output end gears of the front-stage cutting transmission mechanism are simultaneously spline coupled with a spline shaft.

[0008] The outer surface of the suspended end of the front arm, the outer surface of the high-speed end of the arm support and the outer surface of the suspended end of the rear arm are provided as a first group of convex circular arc cylindrical surfaces which are coaxial with the hinge axis of the front and rear hinges, the front groove, the middle groove and the rear groove are provided as a first group of concave circular arc cylindrical surfaces which are coaxial with the hinge axis of the front and rear hinges, 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.

[0009] The arm support can be provided with a protruding structure which protrudes rearward at the position close to the root of the rear arm, the internal cavity of the protruding structure is an auxiliary cavity which is part of the internal cavity of the arm support.

[0010] The connecting arm is provided with an internal cavity which is communicated with the internal cavity of the arm support, and a reinforced cooler can be arranged in the internal cavity of the connecting arm.

[0011] The cutting mechanism of the thin coal seam compact coal mining machine also includes a height adjustment cylinder. One end of the height adjustment cylinder is hinged to the lower part of the connecting arm, and the other end is hinged to the lower part of the front main body shell. The two hinge axes extend horizontally back and forth.

[0012] The lower part of the connecting arm and the lower part of the front main body housing are respectively provided with a cylinder outer receiving cavity and a cylinder inner receiving cavity that extend to the left and right and open downwards. The height adjustment cylinder is set in the cylinder receiving cavity composed of the cylinder outer receiving cavity and the cylinder inner receiving cavity.

[0013] The connecting arm is narrowest in the upper middle part, and becomes wider in the left and right as it approaches 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 in the left and right direction as it approaches the high-speed end of the boom.

[0014] 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 front sliding bearing and a rear sliding bearing are installed in the front hinge connection hole and the rear hinge connection hole on the forearm and the rear arm, respectively. The front sliding bearing and the rear sliding bearing 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 rest of the limit rod does not contact the front pin sleeve, the inner hole of the second ear seat, or the rear spline sleeve.

[0015] The input gear of the front-stage cutting transmission mechanism has spline holes at both the front and rear ends. The spline hole at the front end is coaxially connected to the output shaft of the cutting motor, and the spline hole at the rear end is coaxially connected to the input shaft of the gear pump of the hydraulic system.

[0016] The output gear of the front-stage cutting transmission mechanism has spline holes at both the front and rear ends. The spline hole at the front end is coaxially connected to the spline shaft, and the spline hole at the rear end is the power output port for the crushing mechanism to output power.

[0017] The left and right edges of the front main body housing are provided with the first ear seat, the second ear seat and the connecting base. The rear main body housing is provided with the two third ear seats and the rear groove on the left and right sides respectively. The left and right swing arm housings are hinged to the front main body housing and the rear main body housing from the left and right sides. The front main body housing is equipped with two sets of front-stage cutting transmission mechanisms. The two sets of front-stage cutting transmission mechanisms share a common input end gear. The number of idler gears in the idler gear groups of the left and right sets of front-stage cutting transmission mechanisms is different (odd or even).

[0018] The beneficial effects of this invention are:

[0019] The front-stage cutting transmission mechanism is connected to the spline shaft, the spline shaft to the spline sleeve, and the spline sleeve to the rear-stage cutting transmission mechanism via spline connections. The use of multiple spline connection structures with side clearance significantly increases the radial float. Furthermore, since the components forming the spline connection structure can automatically center, even if the coaxiality of the two hinges between the swing arm housing and the machine body decreases due to wear, the impact on the power transmission between the front and rear-stage cutting transmission mechanisms is relatively small, thus improving the reliability of power transmission.

[0020] The two hinged connection points are set separately in front of and behind the power transmission connection point between the front and rear cutting transmission mechanisms. The radial displacement caused by wear at the two hinged connection points has less impact on the power transmission connection point between them, thus reducing the impact on transmission accuracy.

[0021] The outer surface of the cantilever end of the forearm, the outer surface of the high-speed end of the boom, and the outer surface of the cantilever end of the rear arm are all separated from the bottom of the front, middle, and rear grooves, as well as from the outer surface of the cantilever end of the first and second lugs and the connecting arm. As long as the size of this gap is controlled within a suitable range, the accumulation of coal and rock between the swing arm housing and the front and rear main body housing can be effectively controlled during the swinging of the swing arm housing, ensuring smooth swinging.

[0022] By setting a raised structure on the boom, the connection strength between the rear boom and the boom is improved, and the oil storage volume of the boom's oil chamber is also increased.

[0023] By installing an enhanced cooler in the inner cavity of the connecting arm, the cooling oil chamber is strengthened, thereby improving the cooling effect of the high-power-density swing arm.

[0024] The two hinges are located adjacent to the left or right side of the cutting motor, with no other structures in between. This significantly shortens the lateral length of the coal mining machine body, especially the suspended body section, and also improves the reliability of the connection between the swing arm and the machine body. When the drum cuts the top cutter, only the connecting arm part inside the drum changes position vertically with the swing arm. Combined with the aforementioned thin and flat structure and special inclined surface structure of the connecting arm, the swing arm housing has virtually no impact on the coal platform above when it swings up and down, thus ensuring a large mining range.

[0025] Furthermore, the height adjustment cylinder is located below the cutting motor, further reducing space occupation in the lateral direction and ensuring a compact, short-bore coal mining machine structure. The shortened lateral length of the suspended body allows the machine's center of gravity to shift rearward, improving its overall structural stability. Moreover, the shorter body facilitates the implementation of a straight-push cutter process similar to that of shortwall mining machines, thereby increasing mining efficiency.

[0026] By setting a semi-enclosed cylinder receiving cavity in the lower part of the connecting arm and the front main body housing, sufficient space can be provided for adjusting the swing of the cylinder, accommodating a certain amount of coal, and laying pipelines.

[0027] The spherical plain bearing ensures the cleanliness of its internal friction pairs by incorporating dust-proof structures at both ends. A friction-reducing layer between the inner and outer rings of the bearing reduces wear on the sliding pairs.

[0028] The input gear of the front-stage cutting transmission mechanism has a spline hole at its end, which can transmit power to the gear pump and provide a power source for the hydraulic system. The output gear of the front-stage cutting transmission mechanism has a spline hole at its rear end, which can transmit power to the crushing mechanism. On the one hand, the gear pump and crushing mechanism do not need to be equipped with an additional power source, which not only simplifies the structure but also saves installation space and makes the machine body more compact. On the other hand, the power of the cutting motor is more fully utilized. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of one embodiment of the present invention;

[0030] Figure 2 This is a top sectional view of an embodiment of the present invention;

[0031] Figure 3 for Figure 2 Schematic diagram of the structure of the front and middle main body;

[0032] Figure 4 for Figure 2 Schematic diagram of the swing arm;

[0033] Figure 5 for Figure 1 Schematic diagram of the swing arm;

[0034] Figure 6 for Figure 2 AA section view;

[0035] Figure 7 A schematic diagram of one embodiment of a front sliding bearing;

[0036] Figure 8 This is a schematic diagram of the structure of one embodiment of the rear main body.

[0037] Figure label:

[0038] 1. Swing arm; 11. Swing arm housing; 111. Forearm; 1111. Outer surface of the cantilever end of the forearm; 112. Rear arm; 1121. Outer surface of the cantilever end of the rear arm; 113. Boom; 1131. Outer surface of the high-speed end of the boom; 114. Connecting arm; 1141. Side near the high-speed end of the boom; 1144. Outer cavity of the hydraulic cylinder; 115. Raised structure; 12. Rear-stage cutting transmission mechanism; 121. Input end gear; 122. Planetary reduction mechanism; 123. Splined shaft; 124. Splined sleeve; 13. Roller; 141. Front sliding bearing; 1411. Inner ring; 1412. Outer ring; 1413. Anti-friction layer; 1414. Sealing seat; 1415. Sealing ring; 1416. Sealing seat; 1417. Sealing ring; 1418. Flat key; 142. Rear sliding bearing;

[0039] 2. Front main body; 21. Front main body housing; 211. First ear seat; 212. Second ear seat; 213. Connecting base; 214. Front groove; 215. Middle groove; 216. Hydraulic cylinder inner cavity; 22. Cutting motor; 23. Clutch mechanism; 24. Input end gear; 241. Spline hole; 242. Spline hole; 25. Output end gear; 251. Spline hole; 252. Spline hole; 29. ​​Positioning pin;

[0040] 3. Rear main body; 31. Rear main body shell; 311. Third ear seat; 312. Rear groove;

[0041] 41. Front pin bushing; 42. Rear pin bushing;

[0042] 5. Adjust the height of the hydraulic cylinder. Detailed Implementation

[0043] This invention discloses a compact coal seam mining machine cutting mechanism (which may be simply referred to as the cutting mechanism), such as... Figures 1-8 As shown, the structure includes a swing arm housing 11 (swing arm 1), a front main body housing 21 (front main body 2), and a rear main body housing 31 (rear main body 3). The front and rear main body housings are joined together and positioned by a large flat surface and multiple positioning pins 29, and fixed together by fasteners to form the fuselage. The right or left edge of the front main body housing has a first lug 211, a second lug 212, and a connecting base 213 arranged sequentially from front to back. A front groove 214 is formed between the first and second lugs, and a central groove 215 is formed between the second lug and the connecting base. The rear main body housing 31 includes a rear base and a third lug 311 extending to the right or left from the front of the rear base. A rear groove 312 is formed between the third lug and the rear base.

[0044] The front main body housing houses a front-stage cutting transmission mechanism and a cutting motor 22. The front-stage cutting transmission mechanism includes an input gear 24, an idler gear set, and an output gear 25 arranged sequentially in the left-right direction and connected in a driving relationship. The output shaft of the cutting motor is coaxially connected to the input gear of the front-stage cutting transmission mechanism. In the embodiment shown in the attached figure, the two are coaxially connected via a clutch mechanism 23. The output gear of the front-stage cutting transmission mechanism is located within the connecting base.

[0045] The main body of the swing arm housing is a boom 113 extending left and right, within which a rear-stage cutting transmission mechanism 12 is installed. This rear-stage cutting transmission mechanism employs a fixed-axis gear transmission mechanism, comprising an input gear 121, an idler gear set, and an output gear arranged sequentially and connected in the left-right direction. To easily distinguish the two ends of the boom, the ends containing the input and output gears of the rear-stage cutting transmission mechanism are referred to as the high-speed end and low-speed end of the boom, respectively. A planetary reduction mechanism 122 is installed on the front side of the low-speed end of the boom, with a roller 13 fitted onto the planetary reduction mechanism and coaxially fixedly connected to the planetary carrier of the planetary reduction mechanism. A connecting arm 114 extends forward from the middle of the boom, and a forearm 111 extends to the left or right from the connecting arm. Specifically, for the right swing arm housing of the coal mining machine, the forearm extends to the left from the connecting arm; for the left swing arm housing of the coal mining machine, the forearm extends to the right from the connecting arm. A rear boom 112 is provided at the rear of the high-speed end of the boom. The rear boom is a cantilever structure with one end connected to the boom.

[0046] The forearm, the high-speed end of 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 25 of the front-stage cutting transmission mechanism and the input gear 121 of the rear-stage cutting transmission mechanism are coaxially connected, and their axes are coaxial with the hinge axes of the two hinge points. This ensures 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 front and rear main body shells can occur simultaneously without interference. Sealing rings are installed on the front and rear end faces of the forearm, the high-speed end of the boom, and the rear arm to achieve end face sealing at the relative swinging joint surfaces between the swing arm shell and the front and rear main body shells.

[0047] The input gear core of the rear-stage cutting transmission mechanism has a rear-stage spline hole, in which a spline sleeve 124 with internal and external splines is installed. The spline hole of the spline sleeve and the spline hole of the output gear core of the front-stage cutting transmission mechanism are simultaneously splined to a spline shaft 123. The connections between the front-stage cutting transmission mechanism and the spline shaft, between the spline shaft and the spline sleeve, and between the spline sleeve and the rear-stage cutting transmission mechanism are all splined. The use of multiple spline connection structures with side clearance significantly increases the radial float. Furthermore, since the relevant parts forming the spline connection structure can automatically center, even if the coaxiality of the two hinges decreases due to wear, the impact on the power transmission between the front and rear cutting transmission mechanisms is relatively small, thus improving the reliability of power transmission.

[0048] The two hinged connection points are set separately in front of and behind the power transmission connection point between the front and rear cutting transmission mechanisms. The radial displacement caused by wear at the two hinged connection points has less impact on the power transmission connection point between them, thus reducing the impact on transmission accuracy.

[0049] The outer surface 1111 of the cantilever end of the forearm, the outer surface 1131 of the high-speed end of the boom, and the outer surface 1121 of the cantilever end of the rear arm are configured as a first set of convex arc cylindrical surfaces coaxial with the hinge axes of the two hinges at the front and rear. The bottom surfaces of the front groove, the middle groove, and the rear groove are configured as a first set of concave arc cylindrical surfaces coaxial with the hinge axes of the two hinges at the front and rear. 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.

[0050] Similarly, the outer surface of the overhanging end of the first ear and the second ear is set as a second set of convex arc cylindrical surfaces coaxial with the hinge axis of the two hinges at the front and rear. The side 1141 of the connecting arm near the high-speed end of the boom is set as a second set of concave arc cylindrical surfaces coaxial with the hinge axis of the two hinges at the front and rear. There is a gap between the outer surface of the overhanging end of the first ear and the second ear and the connecting arm.

[0051] By controlling the size of the above-mentioned intervals within a suitable range, the accumulation of coal and rock between the swing arm housing and the front and rear main body housings can be effectively controlled during the swinging of the swing arm housing, ensuring smooth swinging.

[0052] Preferably, a rearwardly protruding ridge structure 115 is provided on the boom near the root of the rear arm. The ridge structure improves the connection strength between the rear arm and the boom. The internal cavity of the ridge structure is an auxiliary cavity, which is part of the inner cavity of the boom and increases the oil storage volume of the boom's oil chamber.

[0053] The connecting arm has an inner cavity that communicates with the inner cavity of the boom. The inner cavity of the connecting arm is equipped with an enhanced cooler to enhance the cooling oil chamber and improve the cooling effect of the high-power density swing arm.

[0054] The cutting mechanism also includes a height adjustment cylinder 5, one end of which is hinged to the lower part of the connecting arm, and the other end is hinged to the lower part of the front main body shell. The two hinge axes extend horizontally back and forth. The height adjustment cylinder is located below the cutting motor, which significantly reduces the space occupied in the left and right directions, ensuring the realization of a compact short-body coal mining machine structure.

[0055] The lower part of the connecting arm and the lower part of the front main body housing are respectively provided with a horizontally extending, downward-opening external cylinder receiving cavity 1144 and an internal cylinder receiving cavity 216. The external cylinder receiving cavity of the lower part of the connecting arm is sealed at one end in the horizontal direction, and the other end is opposite to the internal cylinder receiving cavity. The height adjustment cylinder is located within the cylinder receiving cavity formed by the external cylinder receiving cavity and the internal cylinder receiving cavity. In the longitudinal direction, the external cylinder receiving cavity is located at the middle-forward position of the connecting arm. A pair of external cylinder pin holes are provided on the front and rear walls of the external cylinder receiving cavity. The axis of the external cylinder pin holes extends longitudinally, and the external cylinder pin holes are close to the low-speed end of the boom in the horizontal direction. The extension and retraction of the height adjustment cylinder can cause the swing arm housing to swing up and down around the front and rear main body housings. The cylinder receiving cavity is a semi-enclosed cavity, providing sufficient space for the swing of the height adjustment cylinder, the accommodating of a certain amount of coal, and the laying of pipelines.

[0056] The connecting arm is narrowest in the upper middle part, widening towards the top and bottom, especially at the bottom, to accommodate the outer cavity of the hydraulic cylinder, forming a thin and flat structure. The narrowest point is preferably at the same height as the output shaft of the cutting motor. The top surface of the connecting arm is sloped, with the side closer to the high-speed end of the boom being higher. This thin and flat structure, combined with the unique sloped surface, ensures that the swing arm housing has minimal impact on the coal platform above when swinging up and down, thus guaranteeing a large mining range.

[0057] 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 front sliding bearing 141 and a rear sliding bearing 142 are respectively installed in the front hinge connection hole and the rear hinge connection hole on the forearm and the rear arm. The front sliding bearing and the rear sliding bearing are respectively sleeved in the middle of the front pin sleeve 41 and the rear pin sleeve 42. 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 can be 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. Furthermore, a wear-resistant pad can be fitted and fixed to the rear end of the limiting rod. The limiting rod uses the wear-resistant pad to axially limit the spline shaft, and the spline shaft contacts the wear-resistant pad and rotates relative to the wear-resistant pad. In this embodiment, the front end of the limiting rod is axially fixed to the front pin sleeve by a snap ring and radially supported on the front pin sleeve.

[0058] The two hinges are located adjacent to the left or right side of the cutting motor, with no other structures in between. The small diameter of the pin structure at the hinge also minimizes its lateral space requirement, significantly shortening the lateral length of the coal mining machine, especially the suspended section. By incorporating bearings within the pin structure to bear most of the load, even if the pin structure wears out over time, it will not cause wear or deformation of the swing arm housing or the machine body housing. Replacing the pin structure parts with new ones maintains high connection reliability. Therefore, this hinge structure also improves the connection reliability between the swing arm and the machine body. When the drum cuts the top cutter, only the connecting arm portion inside the drum changes position vertically with the swing arm. Combined with the aforementioned thin and flat structure and special inclined surface of the connecting arm, the swing arm housing's vertical movement has minimal impact on the upper coal platform, ensuring a large mining range.

[0059] Furthermore, shortening the lateral length of the suspended section allows the machine's center of gravity to shift rearward, improving its overall structural stability. Additionally, the shorter machine body facilitates the implementation of a straight-push cutter technique similar to that used in shortwall mining machines, thereby increasing mining efficiency.

[0060] The input gear 24 of the pre-cutting transmission mechanism has spline holes 241 and 242 at its front and rear ends, respectively. The spline hole 241 at the front is coaxially connected to the output shaft of the cutting motor, and the spline hole 242 at the rear is coaxially connected to the input shaft of the gear pump of the hydraulic system. Since the input gear of the pre-cutting transmission mechanism transmits part of the power to the gear pump, the hydraulic system does not need to have a separate power source.

[0061] The output gear 25 of the front-stage cutting transmission mechanism is provided with spline holes 251 and 252 at its front and rear ends, respectively. The spline hole 251 at the front end is coaxially connected to the spline shaft, and the spline hole 252 at the rear end can be used as a reserved power output port for the crushing mechanism to output power. Therefore, a crushing mechanism without a power unit can be set up, saving installation space.

[0062] The sliding bearing is preferably a spherical plain bearing, which has a large load capacity, impact resistance, corrosion resistance, wear resistance, and self-aligning properties. Using a spherical plain bearing helps maintain the coaxiality between the front and rear hinged connection holes and the output gear of the front-stage cutting transmission mechanism and the input gear of the rear-stage cutting transmission mechanism.

[0063] Taking the sliding bearing 141 as an example, the spherical plain bearing also has a friction-reducing layer 1413 between the inner ring 1411 and the outer ring 1412 to reduce the wear of the bearing sliding pair. A sealing seat 1414 and 1416 are respectively provided on the radially outer side of the inner ring and at the front and rear ends of the outer ring. A sealing groove is provided on the radially inner surface of the sealing seat, and sealing rings 1415 and 1417 are installed in the sealing groove. The inner ring 1411 is circumferentially fixed to the front pin sleeve by a flat key 1418. Using this spherical plain bearing can improve the service life of the sliding pair and also help improve the transmission accuracy between the front and rear cutting transmission mechanisms.

[0064] The cutting mechanism can be used on a double-drum coal mining machine. Correspondingly, the left and right edges of the front main body shell are provided with the first lug, the second lug, and the connecting base. The rear main body shell is provided with two third lugs and a rear groove. The left and right swing arm shells are hinged to the front and rear main body shells from the left and right sides. A cutting motor and two sets of front-stage cutting transmission mechanisms are installed inside the front main body shell. The two sets of front-stage cutting transmission mechanisms share a single input gear 24. The number of idler gears in the idler gear sets of the left and right sets differs between odd and even numbers. Using the same power to drive one actuator on each side makes the overall structure of the coal mining machine more compact, which is beneficial for improving the adaptability of short-body coal mining machines to thin coal seam working faces.

[0065] In the case where the hydraulic cylinder contents are provided, the left and right hydraulic cylinder contents are connected, or a single hydraulic cylinder contents 216 shared by both sides can be provided.

[0066] Unless otherwise specified, "before" and "after" in this article refer to directions closer to the coal face and directions farther from the coal face, respectively.

Claims

1. A thin seam compact miner cutting mechanism characterized by: The height-adjusting oil cylinder, the swing arm shell, the front main body shell and the rear main body shell are included, the front main body shell and the rear main body shell are connected and fixed in front and back, the right edge or the left edge of the front main body shell is provided with the first ear seat, the second ear seat and the connecting base in sequence from front to back, the front recess is formed between the first ear seat and the second ear seat, the middle recess is formed between the second ear seat and the connecting base, the rear main body shell includes the rear base and the third ear seat which is suspended from front to right or left in the middle part of the rear base, the rear recess is formed between the third ear seat and the rear base, the front stage cutting transmission mechanism and the cutting motor are installed in the front main body shell, the front stage cutting transmission mechanism includes the input end gear, the idler gear set and the output end gear which are arranged in sequence in the left-right direction and are connected in sequence, the output shaft of the cutting motor is coaxially connected with the input end gear of the front stage cutting transmission mechanism, the output end gear of the front stage cutting transmission mechanism is located in the connecting base, the main body of the swing arm shell is the arm support which extends left and right, the rear stage cutting transmission mechanism is installed in the arm support, the end where the input end gear and the output end gear of the rear stage cutting transmission mechanism are located is called the high-speed end and the low-speed end of the arm support respectively, the connecting arm which is suspended from the arm support to the front is arranged in the middle part of the arm support, the front arm which is suspended from the connecting arm to the left or the right is arranged on the connecting arm, the rear arm is arranged behind the high-speed end of the arm support, the rear arm is a cantilever structure which is connected to the arm support at one end, the front arm, the high-speed end of the arm support and the rear arm are embedded in the front recess, the middle recess and the rear recess respectively, wherein the front arm is hinged with the first ear seat and the second ear seat, the rear arm is hinged with the third ear seat and the rear base, the output end gear of the front stage cutting transmission mechanism and the input end gear of the rear stage cutting transmission mechanism are coaxially connected, and the axis is coaxial with the hinge axis of the front and back hinges; one end of the height-adjusting oil cylinder is hinged with the lower part of the connecting arm, the other end is hinged with the lower part of the front main body shell, the hinge axes of the two hinges extend horizontally in front and back, the lower part of the connecting arm and the lower part of the front main body shell are respectively provided with the oil cylinder outer containing cavity and the oil cylinder inner containing cavity which extend left and right and open downward, the height-adjusting oil cylinder is arranged in the oil cylinder containing cavity which is composed of the oil cylinder outer containing cavity and the oil cylinder inner containing cavity; the connecting arm extends downward beyond the bottom surface of the middle part of the arm support, the middle upper part of the connecting arm is the narrowest in the left-right width, the left-right width becomes wider as it is closer to the upper and lower ends, the lower part is wider, and the oil cylinder outer containing cavity is arranged, the top surface of the connecting arm is an inclined surface, 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-right direction.

2. A thin seam compact miner cutting mechanism as claimed in claim 1, characterized in that: The rear stage cutting transmission mechanism is provided with the rear stage spline hole in the core part of the input end gear, the spline sleeve with the inner spline and the outer spline is installed in the rear stage spline hole, the spline holes of the spline sleeve and the spline hole of the core part of the output end gear of the front stage cutting transmission mechanism are simultaneously spline-coupled with one spline shaft.

3. A thin seam compact machine cutting mechanism as defined in claim 2 wherein: The outer surface of the suspended end of the front arm, the outer surface of the high-speed end of the arm support and the outer surface of the suspended end of the rear arm are provided as the first group of convex circular arc cylindrical surfaces which are coaxial with the hinge axes of the front and back hinges, the front recess, the middle recess and the rear recess are provided as the first group of concave circular arc cylindrical surfaces which are coaxial with the hinge axes of the front and back hinges, the first group of concave circular arc cylindrical surfaces and the first group of convex circular arc cylindrical surfaces correspond to each other and are spaced from each other.

4. A thin seam compact machine cutting mechanism as defined in claim 2 wherein: The arm support is provided with a protruding structure near the root of the rear arm, and the cavity of the protruding structure is an auxiliary cavity which is part of the cavity of the arm support.

5. A thin seam compact machine cutting mechanism as defined in claim 2 wherein: The connecting arm is provided with an inner cavity which is in communication with the cavity of the arm support, and the inner cavity of the connecting arm is provided with a reinforced cooler.

6. A thin seam compact miner cutting mechanism as defined in claims 2, 3, 4 or 5, characterized by: A front wear sleeve is respectively installed in the ear hole of the first ear seat and the ear hole of the front part of the second ear seat, a rear wear sleeve is respectively installed in the ear hole of the third ear seat and the ear hole of the front part of the rear base, a front sliding bearing and a rear sliding bearing are respectively installed in the front hinge connecting hole and the rear hinge connecting hole of the front arm and the rear arm which are involved in the hinge, the front sliding bearing and the rear sliding bearing are respectively sleeved and installed in the middle part of the front pin shaft sleeve and the 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 in communication with the inner hole of the second ear seat, 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 positioned and 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 ear seat and the rear stage spline sleeve.

7. A thin-seam compact miner cutting mechanism as defined in claim 6, wherein: The front part and the rear part of the input end gear of the front stage cutting transmission mechanism are respectively provided with spline holes, the spline hole of the front part is coaxially and transmissionally connected with the output shaft of the cutting motor, and the spline hole of the rear part is coaxially connected with the input shaft of the gear pump of the hydraulic system.

8. A thin seam compact machine cutting mechanism as defined in claim 6, wherein: The front part and the rear part of the output end gear of the front stage cutting transmission mechanism are respectively provided with spline holes, the spline hole of the front part is coaxially connected with the spline shaft, and the spline hole of the rear part is a power output port for outputting power of the crushing mechanism.

9. A thin seam compact machine cutting mechanism as defined in claim 6 wherein: The left and right edges of the front main body part shell are respectively provided with the first ear seat, the second ear seat and the connecting base, the rear main body part shell is correspondingly provided with left and right two third ear seats and a rear groove, the left and right two swing arm shells are hingedly connected with the front main body part shell and the rear main body part shell from the left and right sides, the front main body part shell is internally provided with left and right two groups of front stage cutting transmission mechanisms, the two groups of front stage cutting transmission mechanisms share one input end gear, and the number of idle wheels in the idle wheel set of the left and right two groups of front stage cutting transmission mechanisms is different.

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