CN216841646U - Swing arm of short-span coal mining machine for thin coal seam - Google Patents

Abstract

The utility model relates to a short span coal-winning machine swing arm in thin seam, including the swing arm casing, the main part of swing arm casing is for controlling the cantilever crane that extends, install cutting drive mechanism in the cantilever crane, the input gear and the output gear place end of cutting drive mechanism are regarded as the high-speed end and the low-speed end of cantilever crane respectively, the cantilever crane middle part is equipped with the linking arm from cantilever crane overhang forward, be equipped with the forearm from the linking arm overhang left or right on the linking arm, the forearm is located the place ahead of the high-speed end of cantilever crane, the front portion of the high-speed end of forearm and cantilever crane is equipped with respectively and is used for supplying the cutting motor to act as the round pin axle and install preceding round pin axle mounting hole and back round pin axle mounting hole wherein in, the rear portion at the high-speed end of cantilever crane is installed to the input gear, preceding round pin axle mounting hole and back round pin axle mounting hole all are coaxial with the input gear. The utility model discloses can provide great exploitation scope, great cutting power, can also shorten the fuselage, improve coal-winning machine focus problem.

Description

Swing arm of short-span coal mining machine for thin coal seam

Technical Field

The utility model relates to a coal-winning machine swing arm is particularly useful for the short span coal-winning machine in thin seam, can provide great exploitation scope for the coal-winning machine.

Background

In the existing thin seam coal mining machine, a cutting motor is usually positioned on a rocker arm and swings along with the swinging of the rocker arm. When the rear rocker arm in the advancing direction of the thin seam suspension machine body coal mining machine adopts the cutter, the problem that the mining height of the rear roller is too small can occur, because when the mining height is increased again, the cutting motor of the rear rocker arm interferes with an upper coal platform left after the front roller cuts the bottom cutter, so that the overall mining height of the coal mining machine is too narrow, and the coal mining machine cannot meet the mining requirement of large change of the thickness of a mineral layer of a working face of a thin seam in China.

In order to solve the problems, the industry proposes that the cutting part is a swinging part and a fixed part, and the cutting motor and the main body of the cutting transmission system are arranged on the fixed part, so that the structure of the fixed part is too complex, the left and right lengths of the machine body suspension section are too long, the weight is too large, and the gravity center problem of the whole machine still has great influence on the stress of the whole machine. Moreover, the coal mining machine with a long body structure cannot perform a straight-pushing process similar to a short-wall coal mining machine, and the inclined cutting feed at two ends is long in time, so that the mining efficiency is limited to a certain extent.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a short span coal-winning machine swing arm in thin seam can provide great mining area, great cutting power, can also shorten the fuselage, improves coal-winning machine focus problem.

The utility model discloses a main technical scheme has:

the utility model provides a short span coal-winning machine swing arm in thin seam, including the swing arm casing, the main part of swing arm casing is the cantilever crane of extending about, install cutting drive mechanism in the cantilever crane, the high-speed end and the low-speed end of cantilever crane are regarded as respectively to cutting drive mechanism's input gear and output gear place end, the cantilever crane middle part is equipped with the linking arm that cantilevers forward from the cantilever crane, be equipped with the forearm that cantilevers left or right from the linking arm on the linking arm, the forearm is located the place ahead of the high-speed end of cantilever crane, the front portion of the high-speed end of forearm and cantilever crane is equipped with respectively and is used for supplying the cutting motor to act as the round pin axle and install preceding round pin axle mounting hole and back round pin axle mounting hole wherein in, the rear portion of the high-speed end of cantilever crane is installed to the input gear, preceding round pin axle mounting hole and back round pin axle mounting hole are all coaxial with the input gear, be equipped with terminal surface seal structure on the preceding terminal surface of the high-speed end of cantilever crane.

The connecting arm is provided with an inner cavity and is communicated with the inner cavity of the arm support, and the inner cavity of the connecting arm is internally provided with a reinforced cooler.

The middle part of the arm support can be provided with a bulge structure protruding backwards, a cavity inside the bulge structure is an auxiliary cavity, and the auxiliary cavity is a part of an inner cavity of the arm support.

The cutting transmission mechanism can comprise an input end gear, a first idler gear set, an intermediate gear, a second idler gear set and an output end gear which are in transmission connection in sequence, a gear pump is further arranged in an inner cavity of the arm support, and the intermediate gear is coaxially and fixedly connected with the gear pump.

The outer surface of the overhanging end of the front arm, the outer surface of the front part of the high-speed end of the arm support and the outer surface of the rear part of the high-speed end of the arm support are all arranged into convex arc cylindrical surfaces which are coaxial with the front pin shaft mounting hole, and the side surfaces, close to the high-speed end of the arm support, of the connecting arms in the left-right direction are arranged into concave arc cylindrical surfaces which are coaxial with the front pin shaft mounting hole.

The swing arm of the low-coal-seam short-span coal mining machine further comprises a roller, the planetary reduction mechanism is arranged on the front side of the low-speed end of the arm support, the input end and the output end of the planetary reduction mechanism are respectively a sun gear and a planet carrier, the sun gear is coaxially connected with a gear of the output end, a spline hole is formed in the core part of the planet carrier, the rear shaft section of the roller connecting sleeve is inserted into the core part of the planet carrier and is in spline connection with the core part, the front flange structure of the roller connecting sleeve is axially fixed with the planet carrier, the radial edge of the front part of the roller connecting sleeve is preferably set to be a polygonal male spigot structure, the roller is sleeved outside the roller connecting sleeve and the planetary reduction mechanism, a polygonal female spigot structure is correspondingly arranged on the roller, the roller is radially centered through the matching of the polygonal female spigot structure and the polygonal male spigot structure, the roller and the roller connecting sleeve are coaxially fixed, and the planetary reduction mechanism is a two-stage planetary reduction mechanism.

The side surface of the connecting arm close to the low-speed end of the arm support in the left-right direction is provided with an inwards concave arc cylindrical surface which is coaxial with the output end gear.

The swing arm of the low-coal-seam short-span coal mining machine further comprises a cutting motor, a shell of the cutting motor is rotatably supported in the front pin shaft mounting hole and the rear pin shaft mounting hole through sliding bearings, and an output shaft of the cutting motor is in coaxial transmission connection with the input end gear.

The sliding bearing adopts a joint bearing, an antifriction layer is arranged between an inner ring and an outer ring of the joint bearing, a sealing seat is respectively arranged at the radial outer side of the inner ring and at the front end and the rear end of the outer ring, sealing grooves are respectively arranged on the surface of a radial inner hole and the outer end surface of the sealing seat, and a sealing ring is arranged in each sealing groove.

The swing arm of the low-coal-seam short-span coal mining machine further comprises a clutch mechanism, the clutch mechanism comprises a mandrel and a clutch device, the clutch device is connected in front of the mandrel, a front spline shaft section is arranged at the front of the mandrel, a rear spline shaft section and a guide shaft section are arranged at the rear of the mandrel, the spline shaft section is located in front of the guide shaft section, gear spline holes and guide holes are formed in the front and the rear of a core part of an input end gear at intervals, a motor spline hole is formed in the front of an output shaft of a cutting motor, when the clutch mechanism is located at the rear limit position, the front spline shaft section and the rear spline shaft section of the mandrel are in spline connection with the motor spline hole and the gear spline hole respectively, the front of the guide shaft section is located in the guide holes, and a radial gap is reserved between the guide shaft section and the guide holes.

The utility model has the advantages that:

the utility model discloses a swing arm can regard as the round pin axle with the coal-winning machine fuselage articulated mutually with the cutting motor, has both shortened the length about preceding main part casing, just also equals to have shortened the coal-winning machine and has hung the length about fuselage section, has simplified cutting mechanism's structure again.

The front arm is used as a stressed part for playing a main supporting role and is separated from the arm support provided with the cutting transmission mechanism, and the front part of the high-speed end of the arm support is only used as a secondary stressed part for playing an auxiliary supporting role although being a part of the arm support, so that the cutting transmission mechanism can be basically ensured to be in a good non-stressed state, and the transmission precision is ensured.

The cutting transmission mechanism and the rear pin shaft mounting hole for supporting the cutting motor in an auxiliary mode are arranged in the arm support, the structure is more compact, the power input connection point of the cutting transmission mechanism and the auxiliary supporting point are closer, the power transmission is less influenced by jumping, and the power transmission is more stable and reliable.

The roller and the roller connecting sleeve adopt a relatively compact polygonal positioning and connecting structure, so that the connecting reliability is ensured, the front and rear length of the planetary speed reducing mechanism is greatly shortened, and the structural space arrangement of the swing arm of the high-power-density thin coal seam mining machine is facilitated.

A larger radial gap is reserved between a guide shaft section on a mandrel of the clutch mechanism and a guide hole of an input end gear core part, so that the floating amount of the power transmission structure is increased, and the adaptability of the power transmission structure can be improved.

The cutting motor is supported on the swing arm shell through the joint bearing, and the joint bearing is adopted to help to keep the concentricity between the front pin shaft mounting hole and the rear pin shaft mounting hole and the shell of the cutting motor, so that the transmission precision between the cutting motor and the cutting transmission mechanism is improved. The antifriction layer is arranged between the inner ring and the outer ring of the joint bearing, so that the abrasion of a bearing sliding pair can be reduced, the two ends of the antifriction layer are sealed, the cleanness of an internal friction pair can be ensured, the inside of the bearing can be kept in a good lubricating condition, and accordingly, the antifriction layer is also beneficial to improving the transmission precision between the cutting motor and the cutting transmission mechanism.

The heightening oil cylinder is arranged below the cutting motor, so that the space between a top plate and a bottom plate of a coal face is fully utilized, the length of the suspended machine body section in the left and right direction is greatly shortened, and the distance between two rollers is shortened for a double-roller coal mining machine. The oil cylinder accommodating cavity is arranged to provide relatively clean operation space for the swinging and wiring of the heightening oil cylinder, the swinging process of the swinging arm shell is not affected by mineral aggregates such as coal and the like, and finally the maximum mining range is not affected.

The connecting arm is also provided with an inner cavity and is communicated with the inner cavity of the arm support, so that the oil storage volume in the shell of the swing arm is increased. Moreover, an intensified cooler is arranged in the inner cavity of the connecting arm and used for intensively cooling the oil cavity so as to improve the cooling effect of the high-power density swing arm.

Because the intermediate gear can transmit part of power to the gear pump, the hydraulic system does not need to be additionally provided with an independent power source.

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

The side surface of the connecting arm close to the low-speed end of the arm support is set to be an inner concave circular-arc cylindrical surface coaxial with the output end gear of the cutting transmission mechanism, a certain equidistant gap is kept between the inner concave circular-arc cylindrical surface and the roller blade, and the loading effect of the roller for spirally conveying materials can be improved.

Drawings

FIG. 1 is a front view of one embodiment of a swing arm;

FIG. 2 is a top cross-sectional view of FIG. 1;

FIG. 3 is a schematic structural view of one embodiment of the spherical plain bearing;

FIG. 4 is a cross-sectional view A-A of FIG. 2;

FIG. 5 is a partial enlarged view of the drum mounting structure;

FIG. 6 is a cross-sectional view C-C of FIG. 5;

fig. 7 is a sectional view B-B of fig. 2.

Reference numerals are as follows:

1. a swing arm; 11. a swing arm housing; 111. a forearm; 1111. the cantilever end outer surface of the forearm; 112. the front part of the high-speed end of the arm support; 113. the back part of the high-speed end of the arm support; 114. a connecting arm; 1141. the side surface is close to the high-speed end of the arm support; 1142. the side surface is close to the low-speed end of the arm support; 1143. an inner cavity of the connecting arm; 1144. an oil cylinder accommodating cavity; 1145. an oil cylinder outer pin hole; 1146. an inner concave arc cylindrical surface; 1147. the top surface of the oil cylinder accommodating cavity; 115. an auxiliary chamber; 12. a cutting transmission mechanism; 121. an input end gear; 122. a planetary reduction mechanism; 1221. a planet carrier; 1222. a bearing; 1223. a bearing seat; 1224. a roller connecting sleeve; 123. an intermediate gear; 13. a drum; 132. a polygonal female spigot structure; 14. a sliding bearing; 141. an inner ring; 142. an outer ring; 143. an anti-attrition layer; 144. a sealing seat; 145. a seal ring; 148. a flat bond; 15. a mandrel; 16. an intensive cooler; 161. a water inlet; 162. a cooling tube; 17. a gear pump;

3. a cutting motor;

4. and (5) heightening the oil cylinder.

Detailed Description

The utility model discloses a short span coal-winning machine swing arm 1 (can be referred to as swing arm for short) in thin coal seam, as shown in fig. 1-7, including swing arm casing 11, the cantilever crane of extension about swing arm casing's main part is installed cutting drive mechanism 12 in the cantilever crane. The cutting transmission mechanism adopts a fixed-shaft gear transmission mechanism. In order to distinguish the two ends of the arm support conveniently, the ends of the input end gear 121 (also a high-speed end gear) and the output end gear (also a low-speed 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 114 which is cantilevered forwards from the arm support is arranged in the middle of the arm support, and a front arm 111 which is cantilevered leftwards or rightwards from the connecting arm is arranged on the connecting arm, namely for a right swing arm shell of the coal mining machine, the front arm is cantilevered leftwards from the connecting arm; for the left swing arm housing of the shearer, the forearm depends rightwardly from the link arm. The front arm is located in front of the high-speed end of the arm support, a front pin shaft mounting hole and a rear pin shaft mounting hole are respectively formed in the front arm 111 and the front portion 112 of the high-speed end of the arm support, the cutting motor serves as a pin shaft to be mounted in the front pin shaft mounting hole and the rear pin shaft mounting hole, the input end gear 121 is mounted on the rear portion 113 of the high-speed end of the arm support, the front pin shaft mounting hole and the rear pin shaft mounting hole are coaxial with the input end gear, and an end face sealing structure is arranged on the front end face of the high-speed end of the arm support. The front pin shaft mounting hole and the rear pin shaft mounting hole are used for mounting the cutting motor 3, and the front pin shaft mounting hole and the rear pin shaft mounting hole are coaxial with the input end gear, so that the mounted cutting motor and the input end gear can transmit power coaxially. The swing arm is hinged to the front part of the coal mining machine body through the front arm and the front part of the high-speed end of the arm support. The cutting motor is fixedly connected and rotatably connected with the machine body and the swing arm shell respectively, so that the swing arm shell is hinged with the machine body by taking the cutting motor as a pin shaft. The cutting motor is integrally used as the pin shaft, so that the left and right length of the suspended machine body section is shortened, and the structure of the cutting mechanism is simplified. The related structures such as the winding and the rotor inside the cutting motor can still adopt the conventional structure.

The connecting arm is provided with an inner cavity 1143 and is communicated with the inner cavity of the arm support, so that the oil storage volume in the shell of the swing arm is increased. An intensified cooler 16 is disposed in the inner cavity 1143 of the connecting arm for intensifying the cooling oil cavity to improve the cooling effect of the high power density swing arm. The reinforced cooler can be internally provided with a plurality of cooling pipes which can be connected in series or in parallel. In the enhanced cooler shown in fig. 7, there are two parallel cooling pipes 162, 161 which are common inlets of the two cooling pipes.

The middle part of the arm support is provided with a bulge structure protruding backwards, a cavity inside the bulge structure is an auxiliary cavity 115, and the auxiliary cavity is a part of an inner cavity of the arm support, so that an oil cavity of the arm support is increased, and the shell strength of the arm support is increased.

The cutting transmission mechanism comprises an input end gear 121, a first idler gear set, an intermediate gear 123, a second idler gear set and an output end gear which are in transmission connection in sequence, a gear pump 17 is further arranged in an inner cavity of the arm support, and the intermediate gear is coaxially and fixedly connected with the gear pump. One or more idler pulleys of each of the first and second idler pulley sets may be provided. A first reduction is effected from the input gear to the intermediate gear and a second reduction is effected from the intermediate gear to the output gear. The gear pump is the power source of hydraulic system, because the intermediate gear has given partial power transmission to the gear pump, therefore hydraulic system need not set up independent power source in addition.

The outer surface 1111 of the overhanging end of the front arm, the outer surface of the front part 112 of the high-speed end of the arm support and the outer surface of the rear part 113 of the high-speed end of the arm support are all arranged into convex arc cylindrical surfaces which are coaxial with the mounting hole of the front pin shaft. The corresponding part on the machine body is also provided with the lug seats, and the groove between the lug seats is arranged into an inward-concave arc cylindrical surface which is coaxial with the front pin shaft mounting hole and is used for corresponding to the outward-convex arc cylindrical surface one by one so as to ensure that the swing arm can freely swing without interference.

And the side surface 1141 of the connecting arm close to the high-speed end of the arm support in the left-right direction is an inwards concave arc cylindrical surface coaxial with the front pin shaft mounting hole. Correspondingly, the outer surface of the overhanging end of the lug seat on the machine body is arranged to be an outer convex arc cylindrical surface coaxial with the front pin shaft mounting hole. The two are in one-to-one correspondence, and the free swinging of the swinging arm without interference is ensured.

The swing arm of the low-seam short-span coal mining machine further comprises a roller 13, a roller connecting sleeve 1224 and a planetary speed reducing mechanism 122, wherein the planetary speed reducing mechanism is installed on the front side of the low-speed end of the arm support. The input end and the output end of the planetary reduction mechanism are respectively a sun gear and a planet carrier 1221, a bearing seat 1223 is fixedly arranged relative to the arm support, a bearing 1222 is arranged in the bearing seat, and the planet carrier is supported on the bearing 1222. The sun gear is coaxially connected with the output end gear. The planetary reduction mechanism bears most of the reduction work, so that the cutting transmission mechanism serving as the preceding reduction part can meet the reduction requirement by adopting a relatively simple fixed-shaft gear transmission mechanism, and accordingly the appearance of the arm support for accommodating the cutting transmission mechanism is more regular.

The external load force applied to the roller is transmitted to the machine body through the connecting arm, the front arm and the front part of the high-speed end of the arm support. The front arm is used as a stressed part for main supporting and is separated from the arm support provided with the cutting transmission mechanism, and the front part of the high-speed end of the arm support is only used as a secondary stressed part for auxiliary supporting although being a part of the arm support, so that the cutting transmission mechanism can be basically ensured to be in a good non-stressed state, and the transmission precision is ensured.

The cutting transmission mechanism and the rear pin shaft mounting hole for auxiliary supporting of the cutting motor are arranged in the arm support, so that the structure is more compact, the power input connection point of the cutting transmission mechanism and the auxiliary supporting point are closer, the influence of jumping during power transmission is smaller, and the power transmission is more stable and reliable.

The core of the planet carrier is provided with a spline hole. The rear shaft section of the roller connecting sleeve is inserted into the core part of the planet carrier and connected with the core part of the planet carrier through a spline, the front flange structure of the roller connecting sleeve is axially fixed with the planet carrier, the radial edge of the front part of the roller connecting sleeve is set into a polygonal male spigot structure, the roller is sleeved outside the roller connecting sleeve and the planetary reduction mechanism, the roller is provided with a polygonal female spigot structure 132, the roller passes through the polygonal female spigot structure and the polygonal male spigot structure to be radially centered in a matching manner, and the roller connecting sleeve are coaxially fixed. In the embodiment shown in the drawings, the planetary reduction mechanism is a two-stage planetary reduction mechanism, and the input end and the output end of the planetary reduction mechanism are the input end of the first-stage planetary reduction mechanism and the output end of the second-stage planetary reduction mechanism respectively.

The side surface 1142 of the connecting arm close to the low-speed end of the arm support in the left-right direction is an inward-concave arc cylindrical surface coaxial with the output end gear, and the inward-concave arc cylindrical surface can keep a certain gap with the roller blade, so that the loading effect of the roller for conveying materials spirally is improved.

The swing arm of the low-coal-seam short-span coal mining machine further comprises a cutting motor 3, a shell of the cutting motor is rotatably supported in the front pin shaft mounting hole and the rear pin shaft mounting hole through a sliding bearing 14, and an output shaft of the cutting motor is in coaxial transmission connection with the input end gear. The load at the hinged part is mostly born by the sliding bearing, so that the swing arm shell, the machine body shell and the cutting motor can be well protected from or less influenced, and the connection reliability is kept.

The sliding bearing adopts a joint bearing, and has the advantages of high load capacity, impact resistance, corrosion resistance, wear resistance and self-aligning. The adoption of the joint bearing is helpful for keeping the concentricity between the front pin shaft mounting hole and the rear pin shaft mounting hole and the shell of the cutting motor respectively.

An anti-wear layer 143 is further arranged between the inner ring 141 and the outer ring 142 of the joint bearing to reduce wear of a bearing sliding pair, a sealing seat 144 is respectively arranged at the radial outer side of the inner ring and at the front end and the rear end of the outer ring, sealing grooves are respectively arranged on the surface of a radial inner hole and the outer end face of the sealing seat, and a sealing ring 145 is arranged in each sealing groove. The inner ring and the housing of the cutting motor are circumferentially fixed by a flat key 148. By adopting the joint bearing, the service life of the sliding pair can be prolonged, and the transmission precision between the cutting motor and the cutting transmission mechanism can be improved.

The lower part of the connecting arm is provided with a left-right extending oil cylinder accommodating cavity 1144 with a downward opening, and the oil cylinder accommodating cavity is positioned below the front arm in the front-rear direction. The oil cylinder accommodating cavity is used for installing the heightening oil cylinder 4, the large part of the heightening oil cylinder is positioned in the oil cylinder accommodating cavity during installation, one end of the heightening oil cylinder is hinged to the connecting arm, the other end of the heightening oil cylinder is hinged to the machine body, and the hinged axes of the heightening oil cylinder and the connecting arm horizontally extend from front to back. The heightening oil cylinder can stretch and retract to drive the swing arm shell to swing up and down around the machine body. The oil cylinder accommodating cavity provides a relatively clean operation space for the heightening oil cylinder, the swing arm shell is guaranteed not to be influenced by mineral aggregates such as coal in the swing process, and finally the maximum mining range is guaranteed not to be influenced. Because the heightening oil cylinder can be arranged below the front arm, the space between the top plate and the bottom plate of the coal face is fully utilized, the length of the suspended machine body section in the left-right direction is greatly shortened, and the distance between the two rollers is shortened for the double-roller coal mining machine.

An oil cylinder outer pin hole 1145 is formed in the front cavity wall and the rear cavity wall of the oil cylinder accommodating cavity, which are close to the low-speed end of the arm support, and a hinged shaft for hinging the heightening oil cylinder and the connecting arm is arranged in the oil cylinder outer pin hole. The front width and the rear width of the oil cylinder accommodating cavity are slightly wider than the diameter of the cylinder barrel of the height-adjusting oil cylinder. The space above the cylinder barrel of the heightening cylinder and below the top surface 1147 of the cylinder accommodating cavity is relatively closed, and the heightening cylinder can be used for arranging pipelines of the cylinder. An inner concave arc cylindrical surface 1146 coaxial with the outer pin hole of the oil cylinder can be arranged above the outer pin hole of the oil cylinder, the end of the heightening oil cylinder hinged with the swing arm shell can just smoothly rotate below the inner concave arc cylindrical surface 1146, and coal rock can be prevented from entering the heightening oil cylinder as long as the gap width between the heightening oil cylinder and the swing arm shell is properly controlled.

The swing arm of the low-seam short-span coal mining machine further comprises a clutch mechanism, wherein the clutch mechanism comprises a mandrel 15 and a clutch device, and the clutch device is connected in front of the mandrel. The front part of the mandrel is provided with a front spline shaft section, the rear part of the mandrel is provided with a rear spline shaft section and a guide shaft section, and the spline shaft section is positioned in front of the guide shaft section. The front and the back of the core part of the input end gear are provided with gear spline holes and guide holes at intervals, and the front part of the output shaft of the cutting motor is provided with a motor spline hole. When the clutch mechanism is located at the rear limit position (namely, the closed position), the front spline shaft section and the rear spline shaft section of the mandrel are respectively in spline connection with the motor spline hole and the gear spline hole, the front part of the guide shaft section is located in the guide hole, and a radial gap is reserved between the guide shaft section and the guide hole. When the clutch device is pulled out forwards, the rear spline shaft section of the mandrel is disengaged from the spline hole of the gear, the rear part of the guide shaft section is positioned in the guide hole, and the front spline shaft section of the mandrel is partially disengaged from the spline hole of the motor. A radial gap is reserved between the guide shaft section and the guide hole, so that the floating amount of the power transmission structure is increased, and the adaptability of the power transmission structure can be improved.

The left and right width of the middle upper part of the connecting arm in the height direction is the narrowest, the left and right width is wider as the connecting arm is closer to the upper end part and the lower end part, and particularly the lower part of the connecting arm is wider, so that the oil cylinder accommodating cavity is formed. The whole connecting arm is of a flat and thin structure. The narrowest part of the left and right width is preferably as high as the mounting hole of the front pin shaft. The top surface of the connecting arm is an inclined surface, and the end, which is closer to the high-speed end of the arm support, in the left-right direction is higher. The flat thin structure and the special inclined plane structure of the connecting arm enable the swing arm shell to basically not affect an upper coal platform when swinging up and down, and therefore a large mining range can be obtained.

The front and back as used herein refers to the direction toward and away from the coal wall, respectively, unless specifically indicated otherwise.

Claims (10)

1. The utility model provides a short span coal-winning machine swing arm in thin coal seam which characterized in that: the arm support comprises a swing arm shell, the main body of the swing arm shell is an arm support extending leftwards and rightwards, a cutting transmission mechanism is installed in the arm support, the ends of an input end gear and an output end gear of the cutting transmission mechanism are respectively used as a high-speed end and a low-speed end of the arm support, a connecting arm overhanging forwards from the arm support is arranged in the middle of the arm support, a front arm overhanging leftwards or rightwards from the connecting arm is arranged on the connecting arm, the front arm is located in front of the high-speed end of the arm support, a front pin shaft mounting hole and a rear pin shaft mounting hole which are used for serving as a pin shaft for a cutting motor to be installed in are formed in the front of the front arm and the front of the high-speed end of the arm support respectively, the input end gear is installed at the rear of the high-speed end of the arm support, the front pin shaft mounting hole and the rear pin shaft mounting hole are coaxial with the input end gear, and a terminal surface sealing structure is arranged on the front end surface of the high-speed end of the arm support.

2. The swing arm for a short-span shearer loader for thin coal seams as claimed in claim 1, wherein: the connecting arm is provided with an inner cavity and is communicated with the inner cavity of the arm support, and the inner cavity of the connecting arm is internally provided with a reinforced cooler.

3. The swing arm for a short-span shearer loader for thin coal seams as claimed in claim 1, wherein: the middle part of the arm support is provided with a bulge structure protruding backwards, a cavity inside the bulge structure is an auxiliary cavity, and the auxiliary cavity is a part of an inner cavity of the arm support.

4. The swing arm for a short-span shearer loader for thin coal seams as claimed in claim 1, wherein: the cutting transmission mechanism comprises an input end gear, a first idler gear set, an intermediate gear, a second idler gear set and an output end gear which are sequentially connected in a transmission manner, a gear pump is further arranged in an inner cavity of the arm support, and the intermediate gear is coaxially and fixedly connected with the gear pump.

5. The swing arm for a short-span shearer loader for thin coal seams according to claim 1, wherein: the outer surface of the overhanging end of the front arm, the outer surface of the front part of the high-speed end of the arm support and the outer surface of the rear part of the high-speed end of the arm support are respectively arranged into convex arc cylindrical surfaces coaxial with the front pin shaft mounting hole, and the side surface of the connecting arm close to the high-speed end of the arm support in the left-right direction is arranged into concave arc cylindrical surfaces coaxial with the front pin shaft mounting hole.

6. The swing arm for a short-span shearer loader for thin seams as claimed in claim 1, 2, 3, 4 or 5, wherein: the planetary reduction mechanism is arranged on the front side of the low-speed end of the arm support, the input end and the output end of the planetary reduction mechanism are respectively provided with a sun gear and a planet carrier, the sun gear is coaxially connected with an output end gear, the core part of the planet carrier is provided with a spline hole, the rear shaft section of the roller connecting sleeve is inserted into the core part of the planet carrier and is in spline connection with the core part, the front flange structure of the roller connecting sleeve is axially fixed with the planet carrier, the radial edge of the front part of the roller connecting sleeve is arranged into a polygonal male spigot structure, the roller is sleeved outside the roller connecting sleeve and the planetary reduction mechanism, the roller is provided with a polygonal female spigot structure, the roller is radially centered through the matching of the polygonal female spigot structure and the polygonal male spigot structure, the roller and the roller connecting sleeve are coaxially fixed, and the planetary reduction mechanism is a two-stage planetary reduction mechanism.

7. The swing arm for a short-span shearer loader for thin coal seams as claimed in claim 6, wherein: the side surface of the connecting arm close to the low-speed end of the arm support in the left-right direction is provided with an inwards concave arc cylindrical surface which is coaxial with the output end gear.

8. The swing arm for a short-span shearer according to claim 1, 2, 3, 4, 5, 6 or 7, wherein: the cutting motor is characterized by further comprising a cutting motor, a shell of the cutting motor is rotatably supported in the front pin shaft mounting hole and the rear pin shaft mounting hole through sliding bearings, and an output shaft of the cutting motor is coaxially connected with the input end gear in a transmission mode.

9. The swing arm for a short-span shearer loader for thin coal seams as claimed in claim 8, wherein: the sliding bearing adopts a joint bearing, an antifriction layer is arranged between an inner ring and an outer ring of the joint bearing, two sealing seats are respectively arranged at the radial outer side of the inner ring and the front end and the rear end of the outer ring, sealing grooves are respectively arranged on the surface of a radial inner hole and the outer end surface of each sealing seat, and a sealing ring is arranged in each sealing groove.

10. The swing arm for a short-span shearer loader for thin seams as claimed in claim 9, wherein: the front part of the output shaft of the cutting motor is provided with a motor spline hole, when the clutch mechanism is positioned at the rear limit position, the front spline shaft section and the rear spline shaft section of the mandrel are in spline connection with the motor spline hole and the gear spline hole respectively, the front part of the guide shaft section is positioned in the guide hole, and a radial gap is reserved between the guide shaft section and the guide hole.

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