CN216841645U - Swing arm and swing arm supporting structure of short-span coal mining machine for thin coal seam - Google Patents

Abstract

The utility model relates to a swing arm and swing arm supporting structure of a short-span coal mining machine for a thin coal seam, wherein the main body of a swing arm shell of the swing arm is an arm support extending left and right, the middle part of the arm support is connected with a connecting arm extending forward, the connecting arm is provided with a front arm, the front arm is positioned in front of a high-speed end of the arm support, and the front part of the high-speed end of the front arm, the front part of the high-speed end of the arm support and the rear part of the high-speed end of the arm support are respectively provided with a front pin shaft mounting hole and a rear pin shaft mounting hole which are coaxial with each other and an input gear of a cutting transmission mechanism; the supporting structure comprises a front main body shell, a swinging arm, a cutting motor and a heightening oil cylinder, wherein the left end and the right end of the front main body shell are respectively hinged with one swinging arm by taking the cutting motor as a pin shaft, an output shaft of the cutting motor is coaxially connected with an input end gear on the left side and the right side in a transmission manner, and the heightening oil cylinder is hinged between a front arm of the swinging arm and the front main body shell. The utility model discloses compact structure can provide great exploitation scope and realize shorter fuselage length and relatively clear hydro-cylinder installation space.

Description

Swing arm and swing arm supporting structure of short-span coal mining machine for thin coal seam

Technical Field

The utility model relates to a heightening oil cylinder mounting structure of coal mining machine swing arm and this swing arm is particularly useful for thin seam coal mining machine, helps enlarging the scope of exploitation of thin seam coal mining machine, shortens fuselage length and improves the focus problem of hanging the fuselage.

Background

The cutting motor of the existing thin seam mining machine is usually positioned on a swing arm and swings along with the swing of the swing arm. When the rear swing arm in the advancing direction of the thin seam suspension body coal mining machine adopts the cutter, the problem that the mining height of the rear roller is too small can occur, and the reason is that when the mining height is increased again, the cutting motor of the rear swing 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.

Meanwhile, because the supporting oil cylinder with the existing structure is arranged in an open space, coal rocks are accumulated up and down during working of the supporting oil cylinder, particularly, the coal rocks accumulated between the supporting oil cylinder and the body shell of the coal mining machine can cause the swing of the oil cylinder to be limited, so that the mining height can not meet the theoretical mining requirement, and the oil cylinder can be even directly blocked. In addition, the existing mode of arranging oil cylinders in the left and right longitudinal directions of the body of the coal mining machine further causes the body to be lengthened, so that the problem that the gravity center of the suspended body deviates to the coal wall is obvious.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a short span coal-winning machine swing arm and swing arm bearing structure in thin coal seam, compact structure can provide great mining scope and realize shorter fuselage length and relatively clear hydro-cylinder installation space.

The utility model discloses a main technical scheme has:

a swing arm of a thin seam coal mining machine comprises a swing arm shell, wherein 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 which is cantilevered forwards from the arm support is arranged in the middle of the arm support, a front arm which is cantilevered leftwards or rightwards is arranged on the connecting arm, the front arm is positioned 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 realizing the hinging of a swing arm of the thin seam short-span coal mining machine and a machine body are respectively arranged at the front parts of the front arm and the high-speed end of the arm support, the input end gear is installed at the rear part 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, an oil cylinder accommodating cavity which extends leftwards and is opened downwards is arranged at the lower part of the connecting arm, the oil cylinder accommodating cavity is positioned below the front arm in the front-back direction, a pair of coaxial oil cylinder outer pin holes are formed in the front-back cavity wall of the oil cylinder accommodating cavity, the axis of the oil cylinder outer pin hole extends back and forth, and the oil cylinder outer pin hole is close to the low-speed end of the arm support in the left-right direction.

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, the top surface of the connecting arm is an inclined surface, and the end, closer to the high-speed end of the arm support, in the left and right direction is higher.

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

The connecting arm is provided with an inner cavity and is communicated with the inner cavity of the arm support, the inner cavity of the connecting arm is internally provided with an intensified cooler, and the intensified cooler comprises a plurality of cooling pipes which are connected in series or in parallel.

A window can be formed in the front side cavity wall of the oil cylinder accommodating cavity.

A swing arm supporting structure of a low-seam short-span coal mining machine comprises a front main body part shell, a height-adjusting oil cylinder, a cutting motor and a swing arm of the low-seam short-span coal mining machine, wherein a first lug seat, a second lug seat and a connecting base are sequentially arranged on the right edge or the left edge of the front main body part shell from front to back, a front groove is formed between the first lug seat and the second lug seat, a rear groove is formed between the second lug seat and the connecting base, the high-speed ends of a front arm and an arm support are respectively and correspondingly inserted into the front groove and the rear groove, the cutting motor is arranged in an inner hole formed by combining a lug hole of the first lug seat, a front pin shaft mounting hole, a lug hole of the second lug seat and a rear pin shaft mounting hole as a hinge pin shaft, an output shaft of the cutting motor is coaxially connected with an input end gear, the cutting motor is respectively and fixedly connected and rotatably connected with the front main body part shell and the swing arm shell, the height-adjusting oil cylinder is positioned in an oil cylinder accommodating cavity, one end of the heightening oil cylinder is hinged on an outer pin shaft, the outer pin shaft is arranged in an outer pin hole of the oil cylinder, and the other end of the heightening oil cylinder is hinged on the front main body part shell.

The middle top surface of the oil cylinder accommodating cavity is an inwards concave arc cylindrical surface extending from left to right of a straight bus, an elastic body is embedded between the middle top surface of the oil cylinder accommodating cavity and a cylinder barrel of the heightening oil cylinder, and the top surface and the bottom surface of the elastic body are respectively attached to the middle top surface of the oil cylinder accommodating cavity and the surface of the cylinder barrel of the heightening oil cylinder.

The top surface of the end part of the oil cylinder accommodating cavity, which is close to the low-speed end of the arm support, is an inward-concave arc cylindrical surface extending from the front to the back of a straight bus, and the top surface of the end part covers the hinging lug of the heightening oil cylinder, which is close to the low-speed end of the arm support, along with the shape.

The front pin shaft mounting hole and the rear pin shaft mounting hole are respectively provided with a joint sleeve bearing, and the shell of the cutting motor is rotatably supported in the corresponding front pin shaft mounting hole and the rear pin shaft mounting hole through the joint bearings.

The outer surface of the overhanging end of the front arm and the outer surface of the high-speed end of the arm support on the same swing arm shell are arranged into a first group of convex arc cylindrical surfaces which are coaxial with the front pin shaft mounting hole, the front groove and the rear groove are arranged into a first group of concave arc cylindrical surfaces which are coaxial with the front pin shaft mounting hole, and the first group of concave arc cylindrical surfaces and the first group of convex arc cylindrical surfaces are coaxial and are spaced from each other; the side surface of the connecting arm close to the high-speed end of the arm support is provided with a second group of concave arc cylindrical surfaces coaxial with the front pin shaft mounting hole, the outer surface of the overhanging end of the first lug seat and the outer surface of the overhanging end of the second lug seat are provided with a second group of convex arc cylindrical surfaces coaxial with the front pin shaft mounting hole, and the second group of convex arc cylindrical surfaces and the second group of concave arc cylindrical surfaces are coaxial and are spaced mutually.

The utility model has the advantages that:

the utility model discloses a swing arm can regard as round pin axle and coal-winning machine fuselage front portion to articulate mutually with the cutting motor, has shortened the anterior length of controlling of fuselage, just also equals to have shortened the coal-winning machine and hangs the length of controlling of fuselage section, and the corresponding side-shifting to mining of coal-winning machine fuselage focus makes the force stability of coal-winning machine complete machine obtain improving.

The utility model discloses a swing arm can use the cutting motor to articulate mutually as round pin axle and coal-winning machine fuselage front portion, uses the inboard only linking arm of cylinder along with swing arm luffing motion, the flat thin structure and the special top surface inclined plane structure of linking arm for to top coal platform not influence basically during swing arm casing luffing motion, consequently can ensure to obtain big exploitation scope.

The utility model discloses a swing arm can regard as round pin axle and coal-winning machine fuselage front portion to articulate mutually with the cut motor, and the main speed reduction part of swing arm is acted as by the planetary reduction gears who sets up in the cylinder simultaneously, then only need set up in the swing arm relatively simple cut drive mechanism (for example two-stage dead axle gear drive) can, the cantilever crane appearance is more regular, cut motor and cut drive mechanism have wholly formed simple structure, the compact cutting mechanism of left and right directions size.

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 relatively closed oil cylinder accommodating cavity is provided with a relatively clean operation space for the swinging of the heightening oil cylinder and the arrangement of oil cylinder pipelines, the freely telescopic process of the heightening oil cylinder and the freely swinging process of the swinging arm shell are not affected by mineral aggregates such as coal, 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.

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 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.

Drawings

Fig. 1 is a front view of an embodiment of a swing arm support structure of the present invention;

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

FIG. 3 is a cross-sectional view A-A of FIG. 2;

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

FIG. 5 is a schematic view of the swing arm support structure with the swing arm raised at an angle;

fig. 6 is a working state diagram of the short-span coal mining machine for the thin coal seam.

Reference numerals:

1. a swing arm; 11. a swing arm housing; 111. a 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; 1140. a window; 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; 1146. the top surface of the end part of the oil cylinder accommodating cavity; 1147. the top surface of the middle part of the oil cylinder accommodating cavity; 12. a cutting transmission mechanism; 121. an input end gear; 13. a drum; 14. a bearing;

2. a front body section case; 214. a front groove; 215. a larger diameter groove; 216. a smaller diameter groove;

3. a cutting motor;

4. heightening the oil cylinder; 41. an outer pin shaft; 42. an outer surface of the hinge ear; 43. an elastomer; 44. a cylinder barrel; 45. a cylinder rod.

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. 1-6, 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 positioned in front of the high-speed end of the arm support, a front pin shaft mounting hole and a rear pin shaft mounting hole for realizing the hinging of the swing arm and the body of the coal mining machine are respectively arranged at the front part 112 of the front arm and the high-speed end of the arm support, the input end gear is arranged at the rear part 113 of the high-speed end of the arm support, and the front pin shaft mounting hole and the rear pin shaft mounting hole are coaxial with the input end gear. 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 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, and the other end of the heightening oil cylinder is hinged to the machine body.

Furthermore, a pair of coaxial oil cylinder outer pin holes are formed in the front cavity wall and the rear cavity wall of the oil cylinder accommodating cavity, and the axes of the oil cylinder outer pin holes extend forwards and backwards and are close to the low-speed end of the arm support in the left-right direction. The outer pin hole of the oil cylinder is used for installing an outer pin shaft 41, and the outer pin shaft is used for installing a hinge lug at one end of the heightening oil cylinder.

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 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 blade of the roller 13, so that the loading effect of the roller for conveying materials spirally is improved.

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 is arranged in an inner cavity 1143 of the connecting arm and used for intensifying a cooling oil cavity so as to improve the cooling effect of the high-power density swing arm. A plurality of cooling pipes can be arranged in the intensified cooler, and the plurality of cooling pipes can be connected in series or in parallel.

A window 1140 is formed in the wall of the front side cavity of the oil cylinder accommodating cavity so as to facilitate maintenance of the oil cylinder and the like.

The utility model also discloses a short span coal-winning machine swing arm bearing structure in thin seam, including preceding main part casing 2, heighten hydro-cylinder 4, cutting motor 3 and aforementioned arbitrary one the short span coal-winning machine swing arm 1 in thin seam. The right edge or the left edge of preceding main part casing is equipped with first ear seat, second ear seat and connection base by preceding backward in proper order, forms preceding recess 214 between first ear seat and the second ear seat, forms the back recess between second ear seat and the connection base, and the high-speed end of forearm and cantilever crane corresponds respectively and inserts in preceding recess and back recess, the cutting motor is installed in the hole that is formed by ear hole, preceding round pin axle mounting hole, the ear hole of second ear seat and the combination of back round pin axle mounting hole of first ear seat as articulated round pin axle, and the output shaft and the input gear coaxial drive of cutting motor are connected, and the cutting motor is relative preceding main part casing and swing arm casing fixed connection and rotation connection respectively.

The right end or the left end of the lower part of the front main body part shell is provided with an inner pin hole of the oil cylinder, the large part of the heightening oil cylinder is positioned in the oil cylinder accommodating cavity, and an outer pin shaft and an inner pin shaft which are hinged with the connecting arm and the front main body part shell are respectively arranged in the outer pin hole of the oil cylinder and the inner pin hole of the oil cylinder. The heightening oil cylinder can stretch and retract to drive the swing arm shell to swing up and down around the front main body part shell. 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.

The front and rear width of the cylinder accommodating cavity is slightly wider than the diameter of the cylinder barrel 44 of the height-adjusting cylinder. The middle top surface 1147 of the oil cylinder accommodating cavity is an inwards concave arc cylindrical surface extending from left to right of a straight bus, and the space above the cylinder barrel of the heightening oil cylinder and below the middle top surface 1147 of the oil cylinder accommodating cavity are relatively closed and can be used for laying pipelines of the oil cylinder.

An elastic body 43 can be embedded between the top surface of the middle part of the oil cylinder accommodating cavity and the cylinder barrel of the height-adjustable oil cylinder, and the elastic body can be made of high-elasticity sponge and other materials. The top surface and the bottom surface of elastomer respectively with the hydro-cylinder hold the middle part top surface in chamber and the cylinder surface laminating of heightening the hydro-cylinder, make the elastomer be full of the space of hydro-cylinder top, hydro-cylinder hold the middle part top surface below in chamber, can prevent that the buggy from getting into the hydro-cylinder from the hydro-cylinder top and holding the chamber.

Further, the top surface 1146 of the end part of the oil cylinder accommodating cavity close to the low-speed end of the arm support is an inward-concave arc cylindrical surface extending from the front to the back of a straight bus, the top surface 1146 of the end part covers the upper part of the hinge lug of the heightening oil cylinder close to the low-speed end of the arm support along with the shape and is almost attached to the outer surface 42 of the hinge lug, the outer end of the oil cylinder accommodating cavity is sealed to a certain extent, and pulverized coal is prevented from entering the oil cylinder accommodating cavity from the outer end of the oil cylinder accommodating cavity. The space above the oil cylinder accommodating cavity, particularly the cylinder barrel, is relatively closed by combining the arrangement of the elastic bodies, so that the coal dust can be effectively prevented from entering the oil cylinder accommodating cavity, and the oil cylinder accommodating cavity is ensured to be kept in a relatively clean state. In the embodiment shown in the drawings, the cylinder tube 44 is connected to the connecting arm, and the cylinder rod 45 is connected to the front body section housing.

A set of bearing 14 is respectively arranged in the front pin shaft mounting hole and the rear pin shaft mounting hole, and a shell of the cutting motor is rotatably supported in the corresponding front pin shaft mounting hole and the rear pin shaft mounting hole through the bearings. The load at the hinged part is mostly born by the 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 cutting motor is preferably supported on the swing arm shell through a 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. An anti-wear layer is preferably 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 anti-wear layer are sealed, the cleanness of an internal friction pair can be ensured, the inside of the bearing can keep a good lubricating condition, and accordingly, the anti-wear layer is also beneficial to improving the transmission precision between the cutting motor and the cutting transmission mechanism.

The outer surface of the overhanging end of the front arm and the outer surface of the high-speed end of the arm support on the same swing arm shell are arranged into a first group of convex arc cylindrical surfaces which are coaxial with the front pin shaft mounting hole, the front groove 214 and the rear groove are arranged into a first group of concave arc cylindrical surfaces which are coaxial with the front pin shaft mounting hole, and the first group of concave arc cylindrical surfaces and the first group of convex arc cylindrical surfaces are coaxial and are spaced from each other; the side surface 1141, close to the high-speed end of the arm support, of the connecting arm is provided with a second group of concave arc cylindrical surfaces coaxial with the front pin shaft mounting hole, the outer surface of the overhanging end of the first lug seat and the outer surface of the overhanging end of the second lug seat are provided with a second group of convex arc cylindrical surfaces coaxial with the front pin shaft mounting hole, and the second group of convex arc cylindrical surfaces and the second group of concave arc cylindrical surfaces are coaxial and are spaced mutually. By controlling the size of the corresponding interval within a proper range, the coal rock can be effectively controlled to be accumulated between the swing arm shell and the front main body part shell in the swinging process of the swing arm shell relative to the front main body part shell.

The rear recess is a stepped slot with a larger diameter slot 215 for receiving the front of the high speed end of the boom and a smaller diameter slot 216 for receiving the rear of the high speed end of the boom. Correspondingly, the outer surface of the high-speed end of the arm support is also provided with a step shape.

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, wherein 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 positioned in front of the high-speed end of the arm support, a front pin shaft mounting hole and a rear pin shaft mounting hole for realizing the hinging of the swing arm of the thin coal seam short-span coal mining machine and the coal mining machine body are respectively arranged at the front part of the high-speed end of the arm support, the input end gear is installed at the rear part of the arm support, the front pin shaft mounting hole and the rear pin shaft mounting hole are coaxial with the input end gear, an oil cylinder accommodating cavity extending leftwards and opening downwards is arranged at the lower part of the connecting arm in the front and rear direction, the front cavity wall and the rear cavity wall of the oil cylinder accommodating cavity are provided with a pair of coaxial oil cylinder outer pin holes, the axes of the oil cylinder outer pin holes extend forwards and backwards, and the oil cylinder outer pin holes are close to the low-speed end of the arm support in the left-right direction.

2. The swing arm for a short-span shearer loader for thin coal seams as claimed in claim 1, wherein: 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, the top surface of the connecting arm is an inclined surface, and the end, closer to the high-speed end of the arm support, in the left and right direction is higher.

3. The swing arm for a short-span shearer loader for thin coal seams as claimed in claim 2, wherein: the side surface of the connecting arm close to the low-speed end of the arm support in the left-right direction is arranged to be an inwards concave arc cylindrical surface coaxial with the output end gear.

4. The swing arm for a short-span shearer loader for thin coal seams as claimed in claim 3, wherein: the connecting arm is provided with an inner cavity and is communicated with the inner cavity of the arm support, the inner cavity of the connecting arm is internally provided with an intensified cooler, and the intensified cooler comprises a plurality of cooling pipes which are connected in series or in parallel.

5. The swing arm for a short-span shearer loader for thin coal seams according to claim 1, 2, 3 or 4, wherein: and a window is formed in the front side cavity wall of the oil cylinder accommodating cavity.

6. The utility model provides a short span coal-winning machine swing arm bearing structure in thin seam which characterized in that: the swing arm comprises a front main body part shell, a height-adjusting oil cylinder, a cutting motor and the swing arm of the thin seam short-span coal mining machine as claimed in claim 1, claim 2, claim 3, claim 4 or claim 5, wherein a first lug seat, a second lug seat and a connecting base are sequentially arranged at the right edge or the left edge of the front main body part shell from front to back, a front groove is formed between the first lug seat and the second lug seat, a rear groove is formed between the second lug seat and the connecting base, the high-speed ends of a front arm and a boom are respectively and correspondingly inserted into the front groove and the rear groove, the cutting motor is arranged in an inner hole formed by combining a lug hole of the first lug seat, a front pin shaft mounting hole, a lug hole of the second lug seat and a rear pin shaft mounting hole as a hinge pin shaft, an output shaft of the cutting motor is coaxially connected with an input end gear, the cutting motor is respectively and fixedly connected and rotatably connected with the swing arm and the shell relative to the front main body part shell, the height-adjusting oil cylinder is positioned in an accommodating cavity of the oil cylinder, one end of the heightening oil cylinder is hinged on an outer pin shaft, the outer pin shaft is arranged in an outer pin hole of the oil cylinder, and the other end of the heightening oil cylinder is hinged on the front main body part shell.

7. The swing arm support structure of the low seam short-span shearer loader according to claim 6, wherein: the middle top surface of the oil cylinder accommodating cavity is an inwards concave arc cylindrical surface extending from left to right of a straight bus, an elastic body is embedded between the middle top surface of the oil cylinder accommodating cavity and a cylinder barrel of the heightening oil cylinder, and the top surface and the bottom surface of the elastic body are respectively attached to the middle top surface of the oil cylinder accommodating cavity and the surface of the cylinder barrel of the heightening oil cylinder.

8. The swing arm support structure of the low seam short span shearer according to claim 7, wherein: the top surface of the end part of the oil cylinder accommodating cavity, which is close to the low-speed end of the arm support, is an inward-concave arc cylindrical surface extending from the front to the back of a straight bus, and the top surface of the end part covers the hinging lug of the heightening oil cylinder, which is close to the low-speed end of the arm support, along with the shape.

9. The swing arm support structure of the short-span shearer loader for thin coal seams as claimed in claim 6, 7 or 8, wherein: a set of joint bearing is respectively arranged in the front pin shaft mounting hole and the rear pin shaft mounting hole, and a shell of the cutting motor is rotatably supported in the corresponding front pin shaft mounting hole and the rear pin shaft mounting hole through the joint bearing.

10. The swing arm support structure for a short-span shearer loader for thin coal seams as claimed in claim 9, wherein: the outer surface of the overhanging end of the front arm and the outer surface of the high-speed end of the arm support on the same swing arm shell are arranged into a first group of convex arc cylindrical surfaces which are coaxial with the front pin shaft mounting hole, the front groove and the rear groove are arranged into a first group of concave arc cylindrical surfaces which are coaxial with the front pin shaft mounting hole, and the first group of concave arc cylindrical surfaces and the first group of convex arc cylindrical surfaces are coaxial and are spaced from each other; the side surface of the connecting arm close to the high-speed end of the arm support is provided with a second group of concave arc cylindrical surfaces coaxial with the front pin shaft mounting hole, the outer surface of the overhanging end of the first lug seat and the outer surface of the overhanging end of the second lug seat are provided with a second group of convex arc cylindrical surfaces coaxial with the front pin shaft mounting hole, and the second group of convex arc cylindrical surfaces and the second group of concave arc cylindrical surfaces are coaxial and are spaced mutually.

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