Thin coal seam mining machine swing arm

Abstract

The present application relates to a kind of thin coal seam shearer swing arm, including swing arm shell, the main body of the swing arm shell is left and right extension's arm support, cutting transmission mechanism is installed in arm support, the input end gear and output end gear of cutting transmission mechanism are respectively as the high-speed end and low-speed end of arm support, the connecting arm of arm support middle part is suspended from arm support to front, front arm and rear arm are provided on connecting arm, front arm, rear arm and the high-speed end of arm support are mutually parallel and sequentially spaced from front to back, front pin shaft mounting hole and rear pin shaft mounting hole for being used for the cutting motor to act as pin shaft are respectively provided on front arm and rear arm, front pin shaft mounting hole and rear pin shaft mounting hole are coaxial with the input end gear of cutting transmission mechanism.The present application can provide larger mining range, also help to shorten machine body, improve the problem of coal winning machine gravity center.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of coal winning machine swing arm structure, especially suitable for thin coal seam coal winning machine, help to 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 swing arm, and swings with swing arm. When the rear swing arm of the thin coal seam suspension body coal winning machine cuts on the knife, the problem of the rear drum mining height is too small, 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, so the overall mining height of this coal winning machine is too narrow, and it cannot adapt to the mining requirements of the large thickness variation of thin coal seam working face.

[0003] In view of the above problems, the industry has proposed to divide the cutting part into a swing part and a fixed part, and to set the cutting motor and the main part of the cutting transmission system in the fixed part, resulting in a too complex structure of the fixed part, a longer length and a larger weight of the left and right suspension sections of the machine body, and a still large influence of the center of gravity of the whole machine on the stress of the whole machine. Moreover, 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 for two-end oblique cutting-in knife 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 swing arm, which can provide larger mining range and help to shorten the machine body and improve the center of gravity of the coal winning machine.

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

[0006] A kind of thin coal seam coal winning machine swing arm, comprising a swing arm shell, the main body of the swing arm shell is an arm support extending left and right, 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 provided in the middle of the arm support and suspends forward from the arm support, a front arm and a rear arm are provided on the connecting arm and suspend left or right from the connecting arm, the front arm, the rear arm and the high-speed end of the arm support are parallel to each other and are arranged in sequence from front to back, front pin shaft mounting holes and rear pin shaft mounting holes are respectively provided on the front arm and the rear arm for the cutting motor to act as a pin shaft and be installed therein, and the front pin shaft mounting holes and the rear pin shaft mounting holes are coaxial with the input end gear of the cutting transmission mechanism.

[0007] The outer surface of the suspending end of the front arm, the outer surface of the suspending end of the rear arm and the outer surface of the high-speed end of the arm support are preferably set as convex circular arc cylindrical surfaces coaxial with the front pin shaft mounting holes, and the side surface of the connecting arm close to the high-speed end of the arm support is set as a concave circular arc cylindrical surface coaxial with the front pin shaft mounting holes.

[0008] The thin coal seam mining machine swing arm can further comprise a drum, a drum connecting sleeve and a planetary reduction mechanism, the planetary reduction mechanism is installed at the low speed end of the boom, the output end of the planetary reduction mechanism is a planetary carrier, the planetary carrier is spline-coupled with the drum connecting sleeve, and the drum is coaxially fixedly sleeved on the drum connecting sleeve and is centered through a polygonal stop structure between the drum connecting sleeve.

[0009] The connecting arm is provided with an inner cavity, and the inner cavity of the connecting arm is communicated with the inner cavity of the boom, and a plurality of reinforced coolers in series are arranged in the inner cavity of the connecting arm.

[0010] A plurality of cooling pipes are arranged in each of the reinforced coolers, and the plurality of cooling pipes can be connected in series or in parallel.

[0011] The middle part of the boom is provided with a rear protruding bump structure, and the inner cavity of the bump structure is an auxiliary cavity, which is part of the inner cavity of the boom.

[0012] The connecting arm is a flat and thin structure with a left-right width smaller than an up-down height, and the top surface of the connecting arm is inclined, and the top surface of the connecting arm is higher closer to the high speed end of the boom.

[0013] Bearings are further installed in the front pin shaft mounting hole and the rear pin shaft mounting hole, and the outer rings of the bearings are fixed relative to the front arm and the rear arm.

[0014] The bearings are preferably joint bearings, an anti-friction layer is arranged between the inner ring and the outer ring of the joint bearings, and 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 and the outer end surface of the sealing seat, and a sealing ring is installed in the sealing groove.

[0015] The thin coal seam mining machine swing arm can further comprise a cutting motor, the shell of the cutting motor is rotatably supported in the front and rear joint bearings, the shell of the cutting motor is fixed in the angular direction through a flat key between the inner ring of the bearing, and the output shaft of the cutting motor is coaxially and transmissionally connected with the input end gear of the cutting transmission mechanism.

[0016] The inner cavity of the boom is further provided with 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.

[0017] The thin coal seam mining machine swing arm can further comprise a cutting motor, the shell of the cutting motor is rotatably supported in the front and rear joint bearings, the shell of the cutting motor is fixed in the angular direction through a flat key between the inner ring of the bearing, and the output shaft of the cutting motor is coaxially and transmissionally connected with the input end gear of the cutting transmission mechanism.

[0018] The swing arm of the present application can be connected with the mining machine body through the cutting motor as a pin shaft, which shortens the left and right lengths of the mining machine body segment and simplifies the structure of the cutting mechanism.

[0019] The specific structure design is that the high-speed end of the forearm, the rear arm and the arm support are arranged in sequence from front to back, the forearm and the rear arm are stress positions, the high-speed end of the arm support is a non-stress position, the stress position and the non-stress position are separated, the transmission part located in the arm support is in a good non-stress state, and therefore the transmission precision is improved.

[0020] The relatively compact positioning and connecting structure between the drum and the drum connecting sleeve not only ensures the reliability of the connection, but also greatly shortens the front and back lengths of the planetary reduction mechanism, which is beneficial to the structural space arrangement of the high-power-density thin coal seam coal mining machine swing arm.

[0021] The cutting motor is supported on the forearm and the rear arm through the joint bearing, the concentricity between the front pin shaft mounting hole and the rear pin shaft mounting hole and the shell of the cutting motor can be maintained, and the transmission precision 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, which can reduce the wear of the sliding pair of the bearing, the sealing is arranged at both ends of the wear-reducing layer, the joint bearing can maintain good lubrication conditions, and correspondingly, the transmission precision between the cutting motor and the cutting transmission mechanism is improved.

[0022] In addition to driving other parts of the cutting transmission mechanism to rotate, the input end gear also drives the intermediate gear and the gear pump to rotate. The intermediate gear and the gear pump form 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.

[0023] The arrangement of the auxiliary cavity not only increases the oil cavity of the arm support, but also increases the strength of the shell of the arm support.

[0024] The connecting arm is also provided with an inner cavity, which is communicated with the inner cavity of the arm support, 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 to improve the cooling effect of the high-power-density swing arm.

[0025] The side surface of the connecting arm close to the low-speed end of the arm support is arranged as a concave circular arc cylindrical surface coaxial with the output end gear of the cutting transmission mechanism, and a certain gap is maintained between the concave circular arc cylindrical surface and the drum blade, so that the loading effect of the drum screw conveyor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a front view of an assembly composed of the swing arm shell, the drum and the cutting transmission mechanism mounted thereon;

[0027] Figure 2 It is a front view of an assembly composed of the swing arm shell, the drum and the cutting transmission mechanism mounted thereon; Figure 1

[0028] Figure 3 It is a structure schematic view of one embodiment of the joint bearing.​

[0029] Figure 4 is a sectional view along A-A of Figure 2

[0030] Figure 5 is an enlarged view of the drum mounting structure;

[0031] Figure 6 is a sectional view along C-C of Figure 5

[0032] Figure 7 is a sectional view along B-B of Figure 2

[0033] Reference signs:

[0034] 11. swing arm housing; 111. front arm; 1110. oil cylinder articulation seat; 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. 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; 115. auxiliary cavity; 12. cutting transmission mechanism; 121. input end gear; 122. planetary reduction mechanism; 1221. planetary carrier; 1222. bearing; 1223. bearing seat; 1224. drum connecting sleeve; 123. intermediate gear; 13. drum; 132. polygonal inner stop; 14. bearing; 141. inner ring; 142. outer ring; 143. anti-friction layer; 144. sealing seat; 145. sealing ring; 146. flat key; 16. reinforced cooler; 161. reinforced cooler with cooling pipe series connection; 162. reinforced cooler with cooling pipe parallel connection; 17. gear pump. DETAILED DESCRIPTION

[0035] The present application discloses a swing arm (may be simply referred to as swing arm) of a thin seam coal mining machine, such as Figures 1-7 ​​​As shown, the swing arm housing 11 includes an arm support 113 extending left and right, 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 referred to 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 extends forward from the arm support. A front arm 111 and a rear arm 112 extend left or right 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 arranged in sequence from front to back. For the right swing arm housing of the coal mining machine, the front arm and the rear arm extend left from the connecting arm. For the left swing arm housing of the coal mining machine, the front arm and the rear arm extend right 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 for mounting the cutting motor as a pin shaft therein. 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, so as to ensure that the cutting motor is coaxial with the input end gear after installation to transmit power. The swing arm is hinged to the body of the coal mining machine through the front arm, the rear arm and the cutting motor, which shortens the left and right lengths of the suspended body of the coal mining machine and simplifies the structure of the cutting mechanism.

[0036] The outer surface 1111 of the extended end of the front arm, the outer surface 1121 of the extended end of the rear arm and the outer surface of the high speed end of the arm support are preferably provided as an outer convex circular arc cylindrical surface coaxial with the front pin shaft mounting hole. The corresponding edge of the body of the coal mining machine can be provided as an inner concave circular arc cylindrical surface coaxial with the front pin shaft mounting hole. By controlling the gap width between the outer surface 1121 of the extended end of the rear arm and the high speed end of the arm support and the corresponding inner concave circular arc cylindrical surface of the body of the coal mining machine within a suitable range, the accumulation of coal and rock between the swing arm and the body of the coal mining machine can be effectively controlled during the rotation of the swing arm relative to the body of the coal mining machine.

[0037] Similarly, the side surface 1141 of the connecting arm close to the high speed end of the arm support is provided as an inner concave circular arc cylindrical surface coaxial with the front pin shaft mounting hole. The extended end outer surface of the corresponding lug seat of the body of the coal mining machine can be provided as an outer convex circular arc cylindrical surface coaxial with the front pin shaft mounting hole. By controlling the gap width between the inner concave circular arc cylindrical surface and the corresponding outer convex circular arc cylindrical surface within a suitable range, the accumulation of coal and rock between the swing arm and the body of the coal mining machine can also be effectively controlled during the rotation of the swing arm relative to the body of the coal mining machine.

[0038] An oil cylinder hinging seat 1110 can also be provided on the extended end of the front arm for installing a height adjustment oil cylinder between the swing arm housing and the body of the coal mining machine. The extension and contraction of the height adjustment oil cylinder can drive the swing arm housing to swing up and down.

[0039] The thin seam coal cutter swing arm further comprises a drum 13, a drum connecting sleeve 1224 and a planetary reduction mechanism 122. The planetary reduction mechanism is installed at the low-speed end of the boom. Specifically, a gear ring and front and rear bearing seats 1223 are fixedly installed at the low-speed end of the boom. Bearings 1222 are respectively installed in the two bearing seats. A planet carrier 1221 is rotatably supported on the front and rear bearings. The planet carrier 1221 is an output end of the planetary reduction mechanism. The shaft-shaped part of the drum connecting sleeve is inserted into the core of the planet carrier and is splined to the planet carrier. The drum is coaxially sleeved on the end flange structure of the drum connecting sleeve. The polygonal inner stop 132 on the drum cooperates with the polygonal convex stop of the end flange structure of the drum connecting sleeve to center the drum. The flange structure is fixedly connected with the planet carrier and the drum by bolts. The planetary reduction mechanism is located in the core of the drum. The relatively compact positioning and connecting structure is adopted between the drum and the drum connecting sleeve. In particular, the splined connection part of the planet carrier and the drum connecting sleeve is arranged in the core of the planet carrier. The reliability of the connection can be ensured, and the front and rear lengths of the planetary reduction mechanism can be greatly shortened, which is beneficial to the structural space arrangement of the high-power-density thin seam coal cutter swing arm.

[0040] The planetary reduction mechanism undertakes most of the reduction work. Therefore, the cutting transmission mechanism as the front-stage reduction part adopts a relatively simple fixed-axis gear transmission mechanism to meet the reduction requirement. Correspondingly, the outer shape of the boom for accommodating the cutting transmission mechanism is more regular.

[0041] The external load force received by the drum is transmitted to the coal cutter body 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 boom 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 boom is in a good non-force receiving state, thereby helping to improve the transmission accuracy.

[0042] The side surface 1142 of the connecting arm close to the low-speed end of the boom is preferably arranged as a concave circular-arc cylindrical surface coaxial with the output gear of the cutting transmission mechanism. The concave circular-arc cylindrical surface can keep a certain gap with the drum blade, thereby improving the loading effect of the drum screw conveyor.

[0043] The connecting arm is provided with an inner cavity, and the inner cavity 1143 of the connecting arm is communicated with the inner cavity of the boom. The inner cavity of the connecting arm increases the oil storage volume in the swing arm housing. A plurality of series enhanced coolers 16 are arranged in the inner cavity of the connecting arm. By connecting the plurality of enhanced coolers in series, the cooling length is increased, the narrow oil pool can be enhanced cooling, and the cooling effect of the high-power-density swing arm is improved.

[0044] A plurality of cooling pipes are arranged in the enhanced cooler, and the plurality of cooling pipes can be connected in series or in parallel. In the embodiment shown in the drawings, two cooling pipes in the enhanced cooler 161 are connected in series, and two cooling pipes in the enhanced cooler 162 are connected in parallel.

[0045] The middle part of the arm support is provided with a rearward convex structure, and the cavity in the convex structure is an auxiliary cavity 115, which is part of the inner cavity of the arm support, thereby increasing the oil cavity of the arm support and the strength of the shell of the arm support.

[0046] The connecting arm is a flat and thin structure with a width smaller than the height, and the 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 support. The connecting arm with the above structure has little effect 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.

[0047] The front pin shaft mounting hole and the rear pin shaft mounting hole are also provided with bearings 14, and the outer rings of the bearings are fixed relative to the front arm and the rear arm, for example, a tight fit or a key connection can be used. The bearings are used to support the cutting motor, so that the front arm and the rear arm can rotate relative to the cutting motor. Most of the load at the hinge is borne by the bearings, which can well protect the swinging arm shell, the fuselage shell and the cutting motor from or less affected, and maintain the connection reliability.

[0048] The bearing adopts a joint bearing, which has large load capacity, impact resistance, corrosion resistance, wear resistance and self-aligning. The use of joint bearings helps to maintain the concentricity between the front and rear pin shaft mounting holes and the outer shell of the cutting motor. A wear-reducing layer 143 is arranged between the inner ring 141 and the outer ring 142 of the joint bearing to reduce the wear of the sliding pair of the bearing. An inner hole surface and an outer end surface of each of the sealing seats 144 arranged on the radially outer side of the inner ring and the front and rear ends of the outer ring are provided with sealing grooves, and a sealing ring 145 is arranged in the sealing grooves to realize radial sealing between the inner ring and the sealing seat and end face sealing between the sealing seat and the fuselage. The use of the joint bearing can improve the service life of the sliding pair and help to improve the transmission accuracy between the cutting motor and the cutting transmission mechanism.

[0049] The thin coal seam mining machine swinging arm can also include a cutting motor, and the outer shell of the cutting motor is rotatably supported in the front and rear joint bearings. The outer shell of the cutting motor and the inner ring of the bearing can be fixed angularly by means of a flat key 146, and the output shaft of the cutting motor is coaxially connected with the input end gear of the cutting transmission mechanism.

[0050] The inner cavity of the arm support is also provided with an intermediate gear 123 and a gear pump 17. The input end gear is externally engaged with the intermediate gear, and the intermediate gear is coaxially connected with the gear pump. The input end gear rotates under the drive of the cutting motor, and in addition to driving other parts of the cutting transmission mechanism to rotate, the input end gear also drives the intermediate gear and the gear pump to rotate. The intermediate gear and the gear pump form a power source of a hydraulic system, and the power of the hydraulic system comes from the cutting motor, without the need to additionally set up an independent power source.

[0051] Unless specifically stated otherwise, as used herein, the terms "upstream" and "downstream" refer to directions near and away from the coal wall, respectively.

Claims

1. A swing arm for a thin coal seam mining machine, characterized in that: The device includes a swing arm housing, the main body of which is a boom extending to the left and right. A cutting transmission mechanism is installed inside the boom. The input and output gears of the cutting transmission mechanism serve as the high-speed and low-speed ends of the boom, respectively. A connecting arm extends forward from the middle of the boom. A forearm and a rear arm extend to the left or right from the connecting arm. The forearm, rear arm, and the high-speed end of the boom are parallel to each other and arranged alternately from front to back. The forearm and rear arm are respectively provided with a front pin mounting hole and a rear pin mounting hole for the cutting motor to be installed as a pin. The front pin mounting hole and the rear pin mounting hole are coaxial with the input gear of the cutting transmission mechanism. The installed cutting motor transmits power to the input gear. Bearings are also installed in the front pin mounting hole and the rear pin mounting hole, and the outer ring of the bearing is fixed relative to the forearm and the rear arm.

2. The swing arm of the thin coal seam mining machine as described in claim 1, characterized in that: The outer surface of the cantilever end of the forearm, the outer surface of the cantilever end of the rear arm, and the outer surface of the high-speed end of the boom are all configured as convex arc cylindrical surfaces coaxial with the front pin mounting hole, and the side of the connecting arm near the high-speed end of the boom is configured as a concave arc cylindrical surface coaxial with the front pin mounting hole.

3. The swing arm of the thin coal seam mining machine as described in claim 2, characterized in that: It also includes a roller, a roller connecting sleeve, and a planetary reduction mechanism. The planetary reduction mechanism is installed at the low-speed end of the boom. The output end of the planetary reduction mechanism is a planet carrier. The planet carrier is splinedly connected to the roller connecting sleeve. The roller is coaxially fixedly sleeved on the roller connecting sleeve and centered with the roller connecting sleeve by a polygonal stop structure.

4. The swing arm of the thin coal seam mining machine as described in claim 1, characterized in that: The connecting arm extends downward beyond the bottom surface of the middle part of the boom. The connecting arm has an inner cavity that communicates with the inner cavity of the boom. Multiple series-connected enhanced coolers are provided in the inner cavity of the connecting arm.

5. The swing arm of the thin coal seam mining machine as described in claim 4, characterized in that: Each of the enhanced coolers is equipped with multiple cooling pipes, which are connected in series or in parallel.

6. The swing arm of the thin coal seam mining machine as described in claim 1, characterized in that: The boom has a rearward protruding ridge structure in the middle, and the cavity inside the ridge structure is an auxiliary cavity, which is part of the inner cavity of the boom.

7. The swing arm of the thin coal seam mining machine as described in claim 1, characterized in that: The connecting arm is a thin, flat structure with a width smaller than its height, and the top surface of the connecting arm is sloping. In the left-right direction, the top surface of the connecting arm is higher as it approaches the high-speed end of the boom.

8. The swing arm of a thin coal seam mining machine as described in claims 1, 2, 3, 4, 5, 6, or 7, characterized in that: The bearing is a spherical plain bearing. A friction-reducing layer is provided between the inner ring and the outer ring of the spherical plain bearing. A sealing seat is provided on the radial outer side of the inner ring and at both the front and rear ends of the outer ring. A sealing groove is provided on the radial inner hole surface and the outer end face of the sealing seat, and a sealing ring is installed in the sealing groove.

9. The swing arm of the thin coal seam mining machine as described in claim 8, characterized in that: It also includes a cutting motor, the housing of which is rotatably supported in two sets of spherical bearings at the front and rear. The housing of the cutting motor and the inner ring of the bearing are fixed angularly by a flat key. The output shaft of the cutting motor is coaxially connected to the input gear of the cutting transmission mechanism.

10. The swing arm of the thin coal seam mining machine as described in claim 9, characterized in that: The boom is also equipped with an intermediate gear and a gear pump in its inner cavity. The input end gear meshes with the intermediate gear, and the intermediate gear is coaxially connected to the gear pump.

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