Thin seam compact mining machine swing arm

Abstract

The invention relates to a swing arm of a compact coal mining machine for thin coal seam, which comprises a swing arm shell, the main body of the swing arm shell is a left and right extending arm support, a rear stage cutting transmission mechanism is installed in the arm support, the input end gear and the output end gear of the rear stage cutting transmission mechanism are respectively taken as the high speed end and the low speed end of the arm support, a connecting arm is provided in the middle of the arm support and suspends forward from the arm support, a front arm is provided on the connecting arm and suspends left or right from the connecting arm, a rear arm is provided behind the high speed end of the arm support, the rear arm is a cantilever structure with one end connected to the arm support, front and rear hinged connecting holes are respectively provided on the front and rear arms, the front and rear hinged connecting holes are coaxial with the input end gear, a semi-closed oil cylinder outer containing cavity is provided at the lower part of the connecting arm, and oil cylinder outer pin holes for hinged height adjusting oil cylinders are provided on the front and rear cavity walls of the oil cylinder outer containing cavity. The invention can provide a larger mining range, shorten the machine body and improve the problem of the center of gravity of the coal mining machine.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of coal winning machine swing arm, especially suitable for thin coal seam coal winning machine, help to expand the scope of mining and shorten machine body. BACKGROUND

[0002] On the existing thin coal seam coal winning machine, cutting motor is usually located on swing arm, and swings with swing arm. When the rear swing arm of the running direction of this thin coal seam suspension machine body coal winning machine is on the cutter, the problem of the rear drum mining height is too small will appear, because when mining height increases, rear swing arm cutting motor will interfere with the upper coal table left by the front drum cutting bottom knife, so 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 machine body suspension section being too long, the weight being too large, and the gravity center 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 cannot perform the straight pushing cutter process similar to the short wall coal winning machine, and the time of two-end oblique 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 compact coal winning machine swing arm, can provide larger mining range, shorten machine 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 compact coal winning machine swing arm, including swing arm shell, the main body of the swing arm shell is left and right extending arm frame, rear cutting transmission mechanism is installed in arm frame, the input end gear and output end gear of rear cutting transmission mechanism are respectively as the high speed end and low speed end of arm frame, the middle part of arm frame is provided with the connecting arm that suspends from arm frame to front, the front arm that suspends from connecting arm to left or right is arranged on connecting arm, rear arm is provided with rear arm that suspends from arm frame to front, the front hinge connection hole and rear hinge connection hole are respectively arranged on the front arm and rear arm, the front hinge connection hole, rear hinge connection hole and input end gear are coaxial, the lower part of connecting arm is provided with the semi-closed oil cylinder outer containing cavity, the oil cylinder outer pin hole for hinge height adjustment oil cylinder is arranged on the front and rear cavity wall of oil cylinder outer containing cavity, and the axis of oil cylinder outer pin hole extends forward and backward.

[0007] The position close to the root of rear arm on the arm frame is provided with the rear convex protruding structure, and the internal cavity of protruding structure is auxiliary cavity, which is part of the inner cavity of arm frame.

[0008] The connecting arm is provided with an inner cavity, and the inner cavity of the connecting arm communicates with the inner cavity of the arm support.

[0009] The input gear and the output gear of the rear-stage cutting transmission mechanism are connected by one or more idlers in turn.

[0010] The outer surface of the overhanging end of the front arm, the outer surface of the high-speed end of the arm support and the outer surface of the overhanging end of the rear arm are provided as a first group of convex circular cylindrical surfaces coaxial with the front hinged connecting hole, and the side of the connecting arm close to the high-speed end of the arm support in the left-right direction is provided as a second group of concave circular cylindrical surfaces coaxial with the front hinged connecting hole.

[0011] The left-right width of the middle-upper part of the connecting arm is the narrowest, and the left-right width becomes wider as it approaches the upper and lower ends, and the top surface of the connecting arm is inclined, and the top surface of the connecting arm in the left-right direction is higher as it approaches the high-speed end of the arm support.

[0012] The front side of the low-speed end of the arm support is provided with a planetary reduction mechanism, a drum is coaxially sleeved and installed outside the planetary reduction mechanism, the sun gear of the planetary reduction mechanism is coaxially splined connected with the output gear, and the planet carrier of the planetary reduction mechanism is fixedly connected with the connecting sleeve of the drum.

[0013] The front hinged connecting hole and the rear hinged connecting hole are both provided with sliding bearings.

[0014] The sliding bearing adopts a joint bearing, an anti-friction layer is arranged between the inner ring and the outer ring of the joint bearing, one sealing seat is arranged on the radially outer side of the inner ring and the front and rear ends of the outer ring respectively, a sealing groove is arranged on the radially inner hole surface of the sealing seat, and a sealing ring is arranged in the sealing groove.

[0015] The core of the input gear is provided with a rear-stage spline hole, a spline sleeve with an inner spline and an outer spline is arranged in the rear-stage spline hole, and the rear part of the spline sleeve is splined connected with the front part of a spline shaft.

[0016] The beneficial effects of the present application are:

[0017] The rear end of the spline shaft is used for connecting the front-stage cutting transmission mechanism, the spline shaft, the spline sleeve and the rear-stage cutting transmission mechanism are splined connected, the spline connection structure with side clearance is adopted at multiple positions, the radial floating amount can be obviously increased, and since the related parts forming the spline connection structure can be automatically centered, even if the coaxiality of the front and rear hinged connections is reduced due to wear, the influence on the power transmission between the front-stage and rear-stage cutting transmission mechanisms is also small, and therefore the power transmission reliability is improved.

[0018] The two hinged connection points are arranged in front of and behind the power transmission connection point between the front and rear cutting transmission mechanisms, and the radial displacement caused by wear at the two hinged connection points has less influence on the power transmission connection point between the two hinged connection points, thereby reducing the influence on transmission accuracy.

[0019] The outer surface of the overhanging end of the forearm, the outer surface of the high-speed end of the arm support and the outer surface of the overhanging end of the rear arm are arranged as a first group of convex circular cylindrical surfaces coaxial with the front hinged connection hole, and the side of the connecting arm close to the high-speed end of the arm support in the left-right direction is arranged as a second group of concave circular cylindrical surfaces coaxial with the front hinged connection hole. The corresponding structural surfaces of the fuselage hinged with the swing arm shell are arranged as a first group of concave circular cylindrical surfaces and a second group of convex circular cylindrical surfaces coaxial with the front hinged connection hole, and the gap between the two coaxial circular cylindrical surfaces arranged in pairs is controlled within a suitable range, so that the accumulation of coal and rock into the space between the swing arm shell and the fuselage can be effectively controlled during the up-down swing of the swing arm shell, and the smooth swing can be ensured.

[0020] The setting of the raised structure on the arm support improves the connection strength of the rear arm and the arm support, and also increases the oil storage volume of the oil chamber of the arm support.

[0021] The setting of the reinforced cooler in the inner cavity of the connecting arm reinforces the cooling of the oil chamber and improves the cooling effect of the high-power-density swing arm.

[0022] The setting of the semi-closed oil cylinder outer containing cavity in the lower part of the connecting arm is used to form an oil cylinder containing cavity in combination with the oil cylinder containing cavity arranged in the front lower part of the fuselage, so as to provide sufficient space for the swing of the height-adjusting oil cylinder and the accommodation of certain coal and the layout of pipelines.

[0023] The setting of the height-adjusting oil cylinder below the swing arm shell further reduces the space occupation in the left-right direction, which provides a guarantee for realizing the compact structure of the short fuselage coal mining machine. Due to the shortening of the left-right length of the suspended fuselage section, the gravity center of the whole machine can be offset to the rear, and the stress stability of the whole machine is improved. Moreover, the shortening of the fuselage makes the coal mining machine convenient to perform the straight pushing cutter process similar to the shortwall coal mining machine, thereby improving the mining efficiency.

[0024] The setting of the dust isolation structure at both ends of the joint bearing can ensure the cleanliness of the internal friction pair. The setting of the wear-reducing layer between the inner ring and the outer ring of the joint bearing can reduce the wear of the sliding pair of the bearing. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a front view of an embodiment of the swing arm of the present application;

[0026] Figure 2 It is a top view of an embodiment of the swing arm of the present application;

[0027] Figure 3 is an A-A sectional view of Figure 2

[0028] Figure 4 is a structural schematic view of an embodiment of a sliding bearing;

[0029] Figure 5 is a mounting structure schematic view of an embodiment of the reinforced cooler.

[0030] Reference signs:

[0031] 1. swing arm; 11. swing arm housing; 111. front arm; 1111. outer surface of the overhanging end of the front arm; 112. rear arm; 1121. outer surface of the overhanging end of the rear arm; 113. arm bracket; 1131. outer surface of the high-speed end of the arm bracket; 114. connecting arm; 1141. side surface close to the high-speed end of the arm bracket; 1142. side surface close to the low-speed end of the arm bracket; 1143. inner cavity of the connecting arm; 1144. outer cavity of the oil cylinder; 1145. pin hole of the outer cylinder; 1146. concave arc cylindrical surface; 115. raised structure; 12. rear-stage cutting transmission mechanism; 121. input end gear; 122. planetary reduction mechanism; 123. spline shaft; 124. spline sleeve; 13. roller; 14. sliding bearing; 141. inner ring; 142. outer ring; 143. anti-friction layer; 144. sealing seat; 145. sealing ring; 146. flat key; 16. reinforced cooler; 161. water inlet; 162. cooling pipe. DETAILED DESCRIPTION

[0032] The present application discloses a swing arm of a compact coal mining machine for thin coal seams (which can be simply referred to as swing arm), as shown in Figures 1-5 ​As shown, the swing arm housing 11 including the swing arm 1, the main body of the swing arm housing is the left and right extending arm frame 113, the rear stage cutting transmission mechanism 12 is installed in the arm frame, in order to distinguish the two ends of the arm frame, the input end gear 121 (also the high speed end gear) and the output end gear (also the low speed end gear) of the rear stage cutting transmission mechanism are called the high speed end and the low speed end of the arm frame respectively. The middle part of the arm frame is provided with a connecting arm 114 which is suspended from the arm frame to the front, and the connecting arm is provided with a front arm 111 which is suspended from the connecting arm to the left or to the right, that is, for the right swing arm housing of the coal mining machine, the front arm is suspended from the connecting arm to the left; for the left swing arm housing of the coal mining machine, the front arm is suspended from the connecting arm to the right. The rear of the high speed end of the arm frame is provided with a rear arm 112 which is a cantilever structure connected to the arm frame at one end. The front arm and the rear arm are respectively provided with front and rear hinged connection holes, and the front and rear hinged connection holes and the input end gear are coaxial. The front arm and the rear arm form front and rear hinged connection points with the body of the coal mining machine through the front and rear hinged connection holes respectively. The lower part of the connecting arm is provided with a semi-closed oil cylinder outer containing cavity 1144, and the oil cylinder outer containing cavity is provided with an oil cylinder outer pin hole 1145 for hinged height adjustment oil cylinder on the front and rear cavity walls, and the axis of the oil cylinder outer pin hole extends forward and backward.

[0033] The oil cylinder outer pin hole is close to the low speed end of the arm frame in the left and right direction, and the inner surface of the oil cylinder outer containing cavity close to the low speed end of the arm frame is set as an inner concave circular cylindrical surface 1146 coaxial with the oil cylinder outer pin hole. In the installed state, the corresponding end outer surface of the height adjustment oil cylinder and the inner concave circular cylindrical surface 1146 form a gap with equal width, which is narrow enough not to affect the swing of the height adjustment oil cylinder, and also will not cause the coal powder to enter and cause blockage.

[0034] The arm frame is preferably provided with a rear protruding raised structure 115 at a position close to the root of the rear arm, which improves the connection strength of the rear arm and the arm frame. The internal cavity of the raised structure is an auxiliary cavity, which is part of the inner cavity of the arm frame, and increases the oil storage volume of the oil cavity of the arm frame.

[0035] The connecting arm is provided with an inner cavity 1143 which is communicated with the inner cavity of the arm frame, and increases the oil storage volume in the swing arm housing. The inner cavity of the connecting arm is provided with a reinforced cooler 16 for reinforcing the cooling of the oil cavity to improve the cooling effect of the high power density swing arm. The reinforced cooler can be provided with a plurality of cooling pipes 162 which can be connected in series or in parallel. Figure 5 The reinforced cooler shown is two parallel cooling pipes 162, and 161 is the common water inlet of the two cooling pipes.

[0036] The input end gear and the output end gear of the rear stage cutting transmission mechanism are one or more idlers which are sequentially and externally meshed.

[0037] The outer surface 1111 of the overhanging end of the front arm, the outer surface 1131 of the high-speed end of the arm support, and the outer surface 1121 of the overhanging end of the rear arm are arranged as a first set of convex circular arc cylindrical surfaces coaxial with the front hinge connection hole, and the corresponding positions of the machine body where the arm support is hinged are arranged as a first set of concave circular arc cylindrical surfaces coaxial with the hinge axes of the front and rear hinges, the first set of concave circular arc cylindrical surfaces correspond to the first set of convex circular arc cylindrical surfaces one by one and are spaced from each other, on the one hand, the free swing of the swing arm is not affected, and on the other hand, as long as the size of the spacing is reasonably controlled, the accumulation of coal and rock into the swing arm housing and the machine body can be effectively controlled, and the smooth swing is ensured.

[0038] Similarly, the side surface 1141 of the connecting arm near the high-speed end of the arm support is arranged as a second set of concave circular arc cylindrical surfaces coaxial with the front hinge connection hole. Correspondingly, the overhanging end outer surface of the ear seat on the machine body for being hinged with the swing arm is arranged as a second set of convex circular arc cylindrical surfaces coaxial with the front hinge connection hole, and the surface and the side surface of the connecting arm near the high-speed end of the arm support are spaced from each other.

[0039] The middle and upper part of the connecting arm is the narrowest in left and right width, and the closer to the upper and lower ends, the wider the left and right width, especially the lower part, which is used for arranging the outer oil cylinder accommodating cavity, and the whole connecting arm forms a flat and thin structure. The narrowest part in left and right width is preferably the same height as the front hinge connection hole. The top surface of the connecting arm is inclined, and the closer to the high-speed end of the arm support, the higher the top surface of the connecting arm in left and right direction. The flat and thin structure of the connecting arm and the special inclined surface structure make the swing arm housing swing up and down without affecting the upper coal table, so that a large mining range can be ensured.

[0040] The front side of the low-speed end of the arm support is provided with a planetary reduction mechanism 122, and the planetary reduction mechanism is coaxially sleeved with a drum 13. The sun gear of the planetary reduction mechanism is coaxially splined connected with the output gear, and the planetary carrier of the planetary reduction mechanism is fixedly connected with the connecting sleeve of the drum.

[0041] The side surface 1142 of the connecting arm near the low-speed end of the arm support is arranged as a concave circular arc cylindrical surface coaxial with the output gear, and the concave circular arc cylindrical surface can keep a certain gap with the drum blades, thereby improving the loading effect of the drum screw conveyor.

[0042] The front hinge connection hole and the rear hinge connection hole are both provided with a sliding bearing 14. Most of the load at the hinge is borne by the sliding bearing, which can well protect the swing arm housing, the machine body housing, and the cutting motor from being affected or less affected, and maintain the connection reliability.

[0043] The sliding bearing preferably adopts a knuckle bearing, which has large load capacity, impact resistance, corrosion resistance, wear resistance and self-aligning. The knuckle bearing helps to maintain the coaxiality between the front and rear knuckle connection holes and the output gear of the front cutting transmission mechanism and the input gear of the rear cutting transmission mechanism.

[0044] A wear-reducing layer 143 is preferably arranged between the inner ring 141 and the outer ring 142 of the knuckle bearing to reduce the wear of the sliding pair of the bearing. A sealing seat 144 is arranged at the radially outer side of the inner ring, the front and rear ends of the outer ring, respectively. A sealing groove is arranged on the radially inner hole surface of the sealing seat, and a sealing ring 145 is arranged in the sealing groove to seal between the sealing seat and the inner ring. The inner ring 141 is fixed circumferentially with the corresponding knuckle pin shaft through a flat key 146. The use of the knuckle bearing can improve the service life of the sliding pair and help to improve the transmission accuracy between the front and rear cutting transmission mechanisms.

[0045] The core of the input gear is provided with a rear spline hole, and a spline sleeve 124 with inner and outer splines is arranged in the rear spline hole. The rear part of the spline sleeve is coupled with the front spline of a spline shaft 123. The spline shaft and the spline sleeve are used to connect the front cutting transmission mechanism and the rear cutting transmission mechanism, and the front cutting transmission mechanism is arranged in the fuselage. The front cutting transmission mechanism, the spline shaft, the spline sleeve and the rear cutting transmission mechanism are all coupled by splines. The use of the spline coupling structure with side clearance at multiple positions can significantly increase the radial floating amount. Since the related parts forming the spline coupling structure can automatically center, even if the coaxiality of the front and rear knuckles is reduced due to wear, the impact on the power transmission between the front and rear cutting transmission mechanisms is relatively small, and thus the power transmission reliability is improved.

[0046] The front and rear knuckle connection points are arranged in front of and behind the power transmission connection point between the front and rear cutting transmission mechanisms. The radial displacement of the two knuckle connection points due to wear has less impact on the power transmission connection point located therebetween, and thus the impact on the transmission accuracy is reduced.

[0047] Unless otherwise specified, the front and rear in this article refer to the direction close to the coal wall and the direction away from the coal wall, respectively.

Claims

1. A thin-seam compact miner swing arm, characterized by: The swing arm shell includes a left and right extending arm frame, a rear cutting transmission mechanism is installed in the arm frame, the input gear and the output gear of the rear cutting transmission mechanism are respectively the high speed end and the low speed end of the arm frame, a connecting arm is suspended from the arm frame, the connecting arm extends downward beyond the bottom surface of the middle part of the arm frame, a front arm is suspended from the connecting arm, a rear arm is provided behind the high speed end of the arm frame, the front and rear hinge connection holes are coaxial with the input gear, the lower part of the connecting arm is provided with a semi-closed oil cylinder outer containing cavity, the oil cylinder outer containing cavity is combined with the oil cylinder containing cavity provided in the front lower part of the machine body to form an oil cylinder containing cavity, the oil cylinder outer pin hole is provided on the front and rear cavity walls of the oil cylinder outer containing cavity, the axis of the oil cylinder outer pin hole extends forward and backward, the left and right directions of the oil cylinder outer pin hole are close to the low speed end of the arm frame, the inner surface of the oil cylinder outer containing cavity close to the low speed end of the arm frame is provided as a concave arc cylindrical surface coaxial with the oil cylinder outer pin hole, the middle and upper part of the connecting arm is the narrowest in width, the closer to the upper and lower ends, the wider in width, the lower part is wider, and the oil cylinder outer containing cavity is provided.

2. The thin-seam compact miner swing arm of claim 1, wherein: The arm frame is provided with a rear protruding structure at the position close to the root of the rear arm, the internal cavity of the protruding structure is an auxiliary cavity, and the auxiliary cavity is part of the internal cavity of the arm frame.

3. The thin-seam compact miner swing arm of claim 1, wherein: The connecting arm is provided with an internal cavity, which is communicated with the internal cavity of the arm frame, and a reinforced cooler is arranged in the internal cavity of the connecting arm.

4. The thin-seam compact miner swing arm of claim 1, wherein: One or more idlers are sequentially and externally meshed between the input gear and the output gear of the rear cutting transmission mechanism.

5. The thin-seam compact miner swing arm of claim 1, wherein: The outer surface of the suspended end of the front arm, the outer surface of the high speed end of the arm frame and the outer surface of the suspended end of the rear arm are provided as a first group of convex arc cylindrical surfaces coaxial with the front hinge connection hole, and the side surface of the connecting arm close to the high speed end of the arm frame in the left and right directions is provided as a second group of concave arc cylindrical surfaces coaxial with the front hinge connection hole.

6. The thin-seam compact miner swing arm of claim 1, wherein: The top surface of the connecting arm is an inclined surface, and the closer to the high speed end of the arm frame, the higher in the left and right directions.

7. The thin-seam compact miner swing arm of claim 1, wherein: A planetary reduction mechanism is installed on the front side of the low speed end of the arm frame, a drum is coaxially sleeved and installed outside the planetary reduction mechanism, the sun gear of the planetary reduction mechanism is coaxially splined connected with the output gear, and the planet carrier of the planetary reduction mechanism is fixedly connected with the connecting sleeve of the drum.

8. A thin-seam compact miner swing arm as claimed in claim 1, 2, 3, 4, 5, 6 or 7, characterized by: A sliding bearing is installed in the front and rear hinge connection holes.

9. A thin-seam compact miner swing arm as claimed in claim 8, characterized in that: The sliding bearing is a joint bearing, an abrasion reducing layer is arranged between the inner ring and the outer ring of the joint bearing, a sealing seat is arranged on the radially outer side of the inner ring and the front and rear ends of the outer ring respectively, a sealing groove is arranged on the radially inner hole surface of the sealing seat, and a sealing ring is installed in the sealing groove.

10. A thin-seam compact miner swing arm as claimed in claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, characterized by: The core of the input gear is provided with a rear stage spline hole, a spline sleeve with an inner spline and an outer spline is installed in the rear stage spline hole, the rear part of the spline sleeve is splined connected with the front part of a spline shaft, and the spline shaft and the spline sleeve are used to connect the front cutting transmission mechanism and the rear cutting transmission mechanism, and the front cutting transmission mechanism is installed in the machine body.

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