CN114396263A - Swing arm and swing arm supporting structure of compact coal mining machine for thin coal seam - Google Patents

Abstract

The invention relates to a swing arm and swing arm supporting structure of a compact coal mining machine for a thin coal seam, wherein the main body of a swing arm shell of a swing arm is an arm support extending left and right, the middle part of the arm support is connected with a connecting arm extending forwards, the front part and the rear part of the arm support are respectively provided with a front arm and a rear arm, the root part of the front arm is connected onto the connecting arm, the front arm and the rear arm are respectively provided with a hinge connecting hole for being hinged with a machine body, a rear-stage cutting transmission mechanism is arranged in the arm support, and an input end gear is coaxial with the hinge connecting hole; the supporting structure comprises a front main body part shell, a rear main body part shell, a heightening oil cylinder and a swing arm, wherein the front arm and the rear arm are respectively hinged on the front main body part shell and the rear main body part shell, an output end gear of a front stage cutting transmission mechanism in the front main body part shell is coaxially connected with an input end gear of a rear stage cutting transmission mechanism in a transmission manner, and the heightening oil cylinder is hinged between a connecting arm and the front main body part shell. The invention has compact structure, can provide larger mining range, realizes shorter machine body length and improves the gravity center problem of the machine body.

Description

Swing arm and swing arm supporting structure of compact coal mining machine for thin coal seam

Technical Field

The invention relates to a swing arm of a coal mining machine and a mounting structure of a height-adjusting oil cylinder of the swing arm, which are particularly suitable for a thin coal seam coal mining machine and are beneficial to enlarging the mining range of the thin coal seam coal mining machine, shortening the length of a machine body and improving the gravity center problem of a suspended machine body.

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, especially 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 broken. 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 problems of lengthening the body and deviation of the gravity center of the suspended body to the coal wall to be obvious.

Disclosure of Invention

The invention aims to provide a swing arm and a swing arm supporting structure of a thin coal seam compact coal mining machine, which has a compact structure, can provide a machine body with a larger mining range and a shorter length, and improves the gravity center problem of the machine body.

The main technical scheme of the invention is as follows:

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 rear-stage cutting transmission mechanism is installed in the arm support, the ends of an input end gear and an output end gear of the rear-stage cutting transmission mechanism are respectively used as a high-speed end and a low-speed end of the arm support, a connecting arm suspending forwards from the arm support is arranged in the middle of the arm support, a front arm suspending leftwards or rightwards from the connecting arm is arranged on the connecting arm, a rear arm is arranged behind the high-speed end of the arm support, the rear arm is a cantilever structure with one end connected to the arm support, a front hinge connecting hole and a rear hinge connecting hole are respectively arranged on the front arm and the rear arm, the front hinge connecting hole, the rear hinge connecting hole and the input end gear are coaxial, a semi-closed oil cylinder outer accommodating cavity is arranged at the lower part of the connecting arm, oil cylinder outer accommodating cavity is provided with oil cylinder outer pin holes for hinging and heightening oil cylinders, the axis of the oil cylinder outer pin hole extends forwards and backwards, the oil cylinder outer containing cavity is located in the position, close to the front end, of the middle of the connecting arm in the front-back direction, 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 is the narrowest, the left and right width of the connecting arm 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 top surface of the connecting arm in the left and right directions is higher as the top surface of the connecting arm is closer to the high-speed end of the arm support.

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 inward concave arc cylindrical surface coaxial with the output end gear of the rear-stage cutting transmission mechanism.

The swing arm of the thin coal seam compact coal mining machine further comprises a planetary speed reducing mechanism, a gear ring of the planetary speed reducing mechanism is installed on the front portion of the low-speed end of the arm support, and a sun gear of the planetary speed reducing mechanism is in coaxial transmission connection with a gear at the output end of the rear-stage cutting transmission mechanism.

And a window can be arranged on the side wall of the coal wall of the oil cylinder outer accommodating cavity.

A swing arm supporting structure of a thin coal seam compact coal mining machine comprises a front main body part shell, a rear main body part shell, a heightening oil cylinder and a swing arm of the thin coal seam compact coal mining machine, wherein the front main body part shell and the rear main body part shell are butted and fixed front and back, 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 middle groove is formed between the second lug seat and the connecting base, the rear main body part shell comprises a rear base body and a third lug seat which is positioned in front of the middle of the rear base body and stretches rightwards or leftwards, a rear groove is formed between the third lug seat and the rear base body, a pre-stage cutting transmission mechanism and a cutting motor are installed in the front main body part shell, the pre-stage cutting transmission mechanism comprises an input gear, an idler wheel group and an output gear which are sequentially arranged in the left-right direction and are sequentially in transmission connection, the output shaft of the cutting motor is coaxially connected with the input end gear of the pre-stage cutting transmission mechanism in a transmission way, the output end gear of the pre-stage cutting transmission mechanism is positioned in the connecting base, the high-speed ends and the rear arms of the front arm and the arm support are respectively inserted into the front groove, the middle groove and the rear groove, wherein the front arm is hinged with the first ear seat and the second ear seat, the rear arm is hinged with the third ear seat and the rear base body, the output end gear of the front stage cutting transmission mechanism is coaxially connected with the input end gear of the rear stage cutting transmission mechanism in a transmission way, and is coaxial with the front hinge connecting hole, the lower part of the right end or the left end of the front main body part shell is provided with a semi-closed oil cylinder inner accommodating cavity, the heightening oil cylinder is positioned in an oil cylinder accommodating cavity consisting of an oil cylinder outer accommodating cavity and an oil cylinder inner accommodating cavity, 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 front main body part shell, and an interval is kept between the outer surface of the cavity wall of the outer containing cavity of the oil cylinder and the outer surface of the cavity wall of the inner containing cavity of the oil cylinder, which face each other.

The input end gear core part of the rear-stage cutting transmission mechanism is provided with a rear-stage spline hole, a spline sleeve with an internal spline and an external spline is installed in the rear-stage spline hole, and the spline hole of the spline sleeve and the spline hole of the output end gear core part of the front-stage cutting transmission mechanism are simultaneously connected with one spline shaft spline.

The ear hole of the first ear seat and the ear hole of the front part of the second ear seat are respectively provided with a front wear-resistant sleeve, the ear hole of the third ear seat and the ear hole of the front part of the rear base body are respectively provided with a rear wear-resistant sleeve, the front hinge connecting hole and the rear hinge connecting hole are respectively provided with a sliding bearing, the sliding bearings in the front hinge connecting hole and the rear hinge connecting hole are respectively sleeved and arranged in the middle parts of the front pin shaft sleeve and the rear pin shaft sleeve, the front part and the rear part of the front pin shaft sleeve are tightly matched with the front wear-resistant sleeve, the front part and the rear part of the rear pin shaft sleeve are tightly matched with the rear wear-resistant sleeve, the inner hole of the front pin shaft sleeve is communicated with the inner hole of the second ear seat, two inner holes are respectively provided with a limiting rod, the rear end of the limiting rod extends into the rear-stage spline hole to axially limit the front end of the spline shaft, the front part of the limiting rod is positioned and fixed relative to the front pin shaft sleeve, and the rest parts of the limiting rod are connected with the front pin shaft sleeve, the inner hole of the second ear seat and the rear stage spline housing are not in contact.

The outer surface of the overhanging end of the front arm, the outer surface of the high-speed end of the arm support and the outer surface of the overhanging end of the rear arm on the same swing arm shell are arranged into a first group of convex arc cylindrical surfaces which are coaxial with the front hinge connecting hole, the corresponding front groove, middle groove and rear groove are arranged into a first group of concave arc cylindrical surfaces which are coaxial with the front hinge connecting hole, and the first group of concave arc cylindrical surfaces and the first group of convex arc cylindrical surfaces are in one-to-one correspondence and are spaced from each other; the outer surface of the overhanging end of the first ear seat and the outer surface of the overhanging end of the second ear seat are set to be a second group of convex arc cylindrical surfaces coaxial with the front hinge connecting hole, the corresponding side surface of the connecting arm close to the high-speed end of the arm support is set to be a second group of concave arc cylindrical surfaces coaxial with the front hinge connecting hole, and the second group of convex arc cylindrical surfaces and the second group of concave arc cylindrical surfaces are in one-to-one correspondence and are spaced.

The left and right edges of the front main body shell are respectively provided with the first ear seat, the second ear seat and the connecting base, the rear main body shell is correspondingly provided with the left and right ear seats, the rear groove and the left and right grooves, the swing arm of the thin coal seam compact coal mining machine is hinged with the left and right ends of the front main body shell and the rear main body shell from the left and right sides respectively, two sets of pre-stage cutting transmission mechanisms are arranged in the front main body shell, and the two sets of pre-stage cutting transmission mechanisms share one input gear.

The left and right oil cylinder inner accommodating cavities of the front main body part shell are communicated, or the lower part of the front main body part shell is provided with a left and right shared oil cylinder inner accommodating cavity.

The invention has the beneficial effects that:

the front arm and the rear arm of the swing arm form a front hinged connection point and a rear hinged connection point with the machine body respectively, and a rear cutting transmission mechanism arranged in the arm support between the front arm and the rear arm and a front cutting transmission mechanism arranged in the machine body form a power transmission connection point. The two hinged connection points are separately arranged in front of and behind the power transmission connection point, and the influence of radial displacement caused by abrasion on the two hinged connection points on the power transmission connection point between the two hinged connection points is smaller, so that the influence on the transmission precision can be reduced.

The front-stage cutting transmission mechanism and the spline shaft, the spline shaft and the spline sleeve and the rear-stage cutting transmission mechanism are in spline connection, a plurality of spline connection structures with side clearance fit are adopted, the radial floating amount can be obviously increased, and related parts forming the spline connection structures can be automatically centered, so that the influence on the transmission of power between the front-stage cutting transmission mechanism and the rear-stage cutting transmission mechanism is small even if the front-stage cutting transmission mechanism and the rear-stage cutting transmission mechanism are hinged at the front and the rear parts between the swing arm shell and the machine body and the coaxiality is reduced due to abrasion, and the reliability of power transmission is improved.

Gaps with the same thickness are reserved among the outer surface of the overhanging end of the front arm, the outer surface of the high-speed end of the arm support and the outer surface of the overhanging end of the rear arm, the bottoms of the front groove, the middle groove and the rear groove, and between the outer surfaces of the overhanging ends of the first lug seat and the second lug seat and the connecting arm, and the size of the gap is controlled within a proper range, so that coal rock can be effectively controlled to be accumulated and enter between the swing arm shell and the front and rear main body part shells in the up-and-down swinging process of the swing arm shell, and the smooth swinging is guaranteed.

The semi-closed oil cylinder accommodating cavity is formed in the connecting arm and the lower portion of the front main body portion shell, so that enough space can be provided for the swing of the height-adjusting oil cylinder, certain coal materials can be accommodated, and pipelines can be laid.

The front part and the rear part are hinged to the left side or the right side close to the cutting motor, and no other structure is arranged between the front part and the rear part, so that the left-right length of the body of the coal mining machine, particularly the left-right length of a suspended body section, is obviously shortened, and the connection reliability of a swing arm and the body is also improved. When the top cutter is cut by the roller, the inner side of the roller only changes the up-and-down position of the connecting arm part along with the swing of the swing arm, and the flat thin structure and the special inclined surface structure of the connecting arm are combined, so that the upper coal platform is basically not influenced when the swing arm shell swings up and down, and a large mining range can be ensured.

In addition, the heightening oil cylinder is arranged below the cutting motor, so that the occupied space is further reduced in the left-right direction, and the compact short-body coal mining machine structure is guaranteed. Because the left length and the right length of the suspended machine body section are shortened, the gravity center of the whole machine can be deviated backwards, and the stress stability of the whole machine is improved. And the machine body is shortened, and the corresponding coal mining machine conveniently executes a straight-pushing cutter process similar to a short-wall coal mining machine, so that the mining efficiency is improved.

The heightening oil cylinder is arranged below the cutting motor, and the space above the bottom plate is fully utilized.

The main speed reducing part of the swing arm, namely the planetary speed reducing mechanism, is arranged in the drum, while the other speed reducing parts, namely the front-stage cutting transmission mechanism and the rear-stage cutting transmission mechanism, can be arranged relatively simply, the shape of the arm support is relatively regular, and the size of the machine body and the connecting structure of the swing arm and the machine body can be more compact in the left-right direction.

When the cutting motor is applied to the double-drum shearer, the cutting motor is a common power source of the left swing arm and the right swing arm, the cutting motor is connected with the swing arm without the power source through gear transmission, the structures of the front main body part and the swing arm can be simplified, and accordingly the compactness of the whole structure is ensured.

Drawings

FIG. 1 is a schematic structural view of one embodiment of a swing arm support structure of the present invention;

FIG. 2 is a top cross-sectional view of one embodiment of the swing arm support structure of the present invention;

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

fig. 4 is a schematic structural view of the swing arm in fig. 1 and 2;

FIG. 5 is a schematic structural view of one embodiment of the front body portion;

FIG. 6 is a schematic structural view of one embodiment of the rear body portion;

fig. 7 is a schematic view showing an operating state of a double-drum compact shearer traveling to the left and cutting coal to which the present invention is applied.

Reference numerals:

1. a swing arm; 11. a swing arm housing; 111. a forearm; 1111. the outer surface of the overhanging end of the forearm; 112. a rear arm; 113. a 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; 1144. an oil cylinder outer accommodating cavity; 1146. an inner concave arc cylindrical surface; 115. a ridge structure; 12. a rear stage cutting transmission mechanism; 121. an input end gear; 122. a planetary reduction mechanism; 123. a spline shaft; 124. a spline housing; 13. a drum; 14. a sliding bearing;

2. a front body portion; 21. a front body section case; 211. a first ear mount; 212. a second ear mount; 2121. the outer surface of the overhanging end of the second ear mount; 213. a connection base; 214. a front groove; 215. a middle groove; 216. an accommodating cavity is formed in the oil cylinder; 22. a cutting motor; 23. a clutch mechanism; 24. an input end gear; 25. an output end gear; 29. positioning pins;

3. a rear main body portion; 31. a rear main body housing; 311. a third ear mount; 312. a rear groove;

41. a front pin bush; 42. a rear pin bush;

5. and (5) heightening the oil cylinder.

Detailed Description

The invention discloses a swing arm 1 (which can be called as a swing arm for short) of a thin coal seam mining machine, which comprises a swing arm shell 11 as shown in figures 1-7, wherein the main body of the swing arm shell is a left-right extending arm support, and a rear-stage cutting transmission mechanism 12 is arranged in the arm support. The rear-stage 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 and the output end gear of the rear-stage cutting transmission mechanism are respectively used as a high-speed end and a 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 rear arm 112 is arranged behind the high-speed end 113 of the arm support, and the rear arm is of a cantilever structure with one end connected to the arm support.

The front arm and the rear arm are respectively provided with a front hinge connecting hole and a rear hinge connecting hole, and the front hinge connecting hole, the rear hinge connecting hole and the input end gear are coaxial. The input end gear is used for receiving power from the fore cutting transmission mechanism, and the arrangement is coaxial, so that the fore cutting transmission mechanism arranged in the machine body can transmit power to the aft cutting transmission mechanism, and the swinging arm can swing up and down relative to the machine body at the same time without mutual interference. And the front end face and the rear end face of each of the front arm, the high-speed end of the arm support and the rear arm are respectively provided with a sealing ring for realizing the end face sealing at the relative swing joint surface between the swing arm shell and the machine body.

The lower portion of the connecting arm is provided with a semi-enclosed cylinder outer receiving cavity 1144. One end of the oil cylinder outer containing cavity in the left and right direction is opposite to the machine body, and the other end is sealed. And the front cavity wall and the rear cavity wall of the oil cylinder outer containing cavity are respectively provided with an oil cylinder outer pin hole for hinging the heightening oil cylinder, and the axis of the oil cylinder outer pin hole extends forwards and backwards. The cylinder outer containing cavity is combined with a cylinder inner containing cavity 216 arranged on the machine body to form a cylinder containing cavity for containing the heightening cylinder 5.

The oil cylinder outer containing cavity is located in the position, close to the front end, of the middle of the connecting arm in the front-back direction, and the oil cylinder outer pin hole is close to the low-speed end of the arm support in the left-right direction. The inner surface of the cylinder outer accommodating cavity close to the low-speed end of the arm support is preferably set to be an inner concave arc cylindrical surface 1146 coaxial with the cylinder outer pin hole. In the installation state, a gap with the same width is formed between the outer surface of the corresponding end of the heightening oil cylinder and the concave arc cylindrical surface 1146, and the gap is narrow enough, so that the swinging of the heightening oil cylinder is not influenced, and the coal dust cannot enter the gap to cause blockage.

The left and right width of the middle upper part of the connecting arm is narrowest, the left and right width of the connecting arm is wider as the connecting arm is closer to the upper end part and the lower end part, particularly the lower part of the connecting arm is wider, the connecting arm is used for arranging the oil cylinder outer containing cavity, and the whole connecting arm forms a flat and thin structure. The narrowest part of the left and right width is preferably as high as the front hinge connecting hole. 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 one end of the high-speed end of the arm support. 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.

A bulge structure 115 protruding backwards can be arranged on the arm support and close to the root of the rear arm, so that the connection strength of the rear arm and the arm support is improved, a cavity in the bulge structure is an auxiliary cavity, the auxiliary cavity is a part of an inner cavity of the arm support, and the oil storage volume of an oil cavity of the arm support is increased.

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

The swing arm of the thin coal seam compact coal mining machine further comprises a planetary speed reducing mechanism 122, a gear ring of the planetary speed reducing mechanism is installed on the front portion of the low-speed end of the arm support, and a sun gear of the planetary speed reducing mechanism is in coaxial transmission connection with a gear at the output end of the rear-stage cutting transmission mechanism. The roller 13 is sleeved outside the planetary reduction mechanism and is coaxially and fixedly connected with a planet carrier of the planetary reduction mechanism.

A window can be formed in the coal wall side wall of the oil cylinder outer containing cavity, so that the height-adjusting oil cylinder can be maintained conveniently.

The invention also discloses a swing arm supporting structure of the thin seam compact coal mining machine (which can be referred to as a swing arm supporting structure for short), which comprises a front main body part shell 21 of the front main body part 2, a rear main body part shell 31 of the rear main body part 3, a height-adjusting oil cylinder 5 and the swing arm 1 of the thin seam compact coal mining machine, wherein the front main body part shell and the rear main body part shell are in front-back butt joint, are positioned by a large plane and a plurality of positioning pins 29 and are fixed by fasteners to form a machine body. The right edge or the left edge of the front main body part shell is sequentially provided with a first ear seat 211, a second ear seat 212 and a connecting base 213 from front to back, a front groove 214 is formed between the first ear seat and the second ear seat, and a middle groove 215 is formed between the second ear seat and the connecting base. The rear body portion housing includes a rear base and a third ear mount 311 that is positioned in front of the middle portion of the rear base and overhangs rightward or leftward, and a rear recess 312 is formed between the third ear mount and the rear base. The front body shell is internally provided with a front stage cutting transmission mechanism and a cutting motor 22, the front stage cutting transmission mechanism comprises an input gear 24, an idler wheel set and an output gear 25 which are sequentially arranged in the left-right direction and are sequentially connected in a transmission way, and the output shaft of the cutting motor is coaxially connected with the input gear of the front stage cutting transmission mechanism in a transmission way, and in the embodiment shown in the attached drawing, the two are coaxially connected through a clutch mechanism 23. And an output end gear of the preceding stage cutting transmission mechanism is positioned in the connecting base.

The high-speed end and the rear arm of the front arm and the arm support are respectively inserted into the front groove, the middle groove and the rear groove, wherein the front arm is hinged with the first ear seat and the second ear seat, and the rear arm is hinged with the third ear seat and the rear base body. The output end gear 25 of the front stage cutting transmission mechanism is coaxially connected with the input end gear 121 of the rear stage cutting transmission mechanism in a transmission way, and the axis of the output end gear is coaxial with the front hinge connecting hole.

The front part and the rear part are hinged to the left side or the right side close to the cutting motor, and no other structure is arranged between the front part and the rear part, so that the left-right length of the body of the coal mining machine, particularly the left-right length of a suspended body section, is obviously shortened, and the connection reliability of a swing arm and the body is also improved. When the top cutter is cut by the roller, the inner side of the roller only changes the up-and-down position of the connecting arm part along with the swinging of the swinging arm, and the flat thin structure and the special inclined surface structure of the connecting arm are combined, so that the upper coal platform is basically not influenced when the swinging arm shell swings up and down, and a large mining range can be ensured.

In addition, the left length and the right length of the suspended machine body section are shortened, so that the gravity center of the whole machine can be deviated backwards, and the stress stability of the whole machine is improved. And the machine body is shortened, and the corresponding coal mining machine conveniently executes a straight-pushing cutter process similar to a short-wall coal mining machine, so that the mining efficiency is improved.

The lower part of the right end or the left end of the front main body part shell is provided with a semi-closed cylinder inner accommodating cavity 216. The heightening oil cylinder is positioned in an oil cylinder accommodating cavity formed by an oil cylinder outer accommodating cavity and an oil cylinder inner accommodating cavity. One end of the heightening oil cylinder is hinged on the connecting arm, and the other end of the heightening oil cylinder is hinged on the front main body part shell. The outer surfaces of the cavity walls of the outer containing cavity of the oil cylinder and the inner containing cavity of the oil cylinder, which face each other, are spaced from each other. 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 and the rear main body part shell. The oil cylinder accommodating cavity is a semi-closed cavity and can provide enough space for heightening the swing of the oil cylinder, accommodating certain coal and laying pipelines.

The input end gear core part of the rear-stage cutting transmission mechanism is provided with a rear-stage spline hole, a spline sleeve 124 with an internal spline and an external spline is installed in the rear-stage spline hole, and the spline hole of the spline sleeve and the spline hole of the output end gear core part of the front-stage cutting transmission mechanism are in spline connection with a spline shaft 123. The front-stage cutting transmission mechanism and the spline shaft, the spline shaft and the spline housing and the rear-stage cutting transmission mechanism are in spline connection, a plurality of spline connection structures with side clearance fit are adopted, the radial floating amount can be obviously increased, and related parts forming the spline connection structures can be automatically centered, so that the influence on the transmission of power between the front-stage cutting transmission mechanism and the rear-stage cutting transmission mechanism is small even if the front-stage cutting transmission mechanism and the rear-stage cutting transmission mechanism are hinged and the coaxiality is reduced due to abrasion, and the reliability of power transmission is improved.

The front and the rear hinged connection points are separately arranged in front of and behind the power transmission connection point between the front and the rear cutting transmission mechanisms, and the influence of radial displacement caused by abrasion on the power transmission connection point between the two hinged connection points is smaller, so that the influence on the transmission precision can be reduced.

Wear-resisting cover before installing respectively in the earhole of first earmount and the earhole of second earmount front portion, wear-resisting cover after installing respectively in the earhole of third earmount and the earhole of back base member front portion. Sliding bearings 14 are arranged in the front hinge connecting hole and the rear hinge connecting hole, most of load at the hinge joint is borne by the bearings, the swing arm shell, the machine body shell and the cutting motor can be well protected from being influenced or less influenced, and the connection reliability is kept. The sliding bearings in the front and rear hinged connecting holes are respectively sleeved in the middle parts of the front pin shaft sleeve 41 and the rear pin shaft sleeve 42, the front part and the rear part of the front pin shaft sleeve are tightly matched with the front wear-resistant sleeve, and the front part and the rear part of the rear pin shaft sleeve are tightly matched with the rear wear-resistant sleeve. The hole of preceding round pin axle sleeve communicates with each other with the hole of second ear seat, installs the gag lever post in two holes, and the rear end of gag lever post stretches into and carries out the axial spacing to the front end of spline shaft in the back level splined hole, and the anterior relative preceding round pin axle sleeve of gag lever post is fixed a position, and all the other parts of gag lever post all do not contact with the hole and the back level splined sleeve of preceding round pin axle sleeve, second ear seat. In this embodiment, the front end of the limiting rod is axially fixed on the front pin sleeve through the snap spring and radially supported on the front pin sleeve.

The outer surface 1111 of the overhanging end of the front arm, the outer surface of the high-speed end of the arm support and the outer surface of the overhanging end of the rear arm on the same swing arm shell are arranged into a first group of outward convex circular arc cylindrical surfaces which are coaxial with the front hinge connecting hole, the front groove, the middle groove and the rear groove are correspondingly arranged into a first group of inward concave circular arc cylindrical surfaces which are coaxial with the front hinge connecting hole, and the first group of inward concave circular arc cylindrical surfaces and the first group of outward convex circular arc cylindrical surfaces are in one-to-one correspondence and are spaced from each other. The outer surface of the overhanging end of the first ear seat and the outer surface 2121 of the overhanging end of the second ear seat are set to be a second group of convex arc cylindrical surfaces coaxial with the front hinge connecting hole, the corresponding side surface 1141, close to the high-speed end of the arm support, on the connecting arm is set to be a second group of concave arc cylindrical surfaces coaxial with the front hinge connecting hole, and the second group of convex arc cylindrical surfaces and the second group of concave arc cylindrical surfaces are in one-to-one correspondence and are spaced. By controlling the size of the interval within a proper range, the coal rock accumulation can be effectively controlled to enter between the swing arm shell and the front and rear main body part shells in the up-and-down swing process of the swing arm shell, and the smoothness of swing is ensured.

The invention can be used on a double-drum shearer, correspondingly, the left edge and the right edge of the shell of the front main body part are respectively provided with the first lug seat, the second lug seat and the connecting base, the shell of the rear main body part is correspondingly provided with the left third lug seat and the right third lug seat and the rear groove, and the left and the right compact type swinging arms of the thin coal seam shearer are respectively hinged with the left and the right ends of the shell of the front main body part and the shell of the rear main body part from the left and the right sides. A cutting motor and a left and a right groups of front stage cutting transmission mechanisms are arranged in the front main body shell, and the two groups of front stage cutting transmission mechanisms share one input end gear 24. The number of the idle wheels in the idle wheel groups of the left and right front-stage cutting transmission mechanisms is different. The left executing mechanism and the right executing mechanism are driven by the same power, so that the overall structure of the coal mining machine is more compact, and the adaptability of the short-body coal mining machine to the working surface of the thin coal seam is improved.

For the condition that the oil cylinder inner containing cavity is arranged, the left oil cylinder inner containing cavity and the right oil cylinder inner containing cavity of the front main body part shell are communicated, or the lower part of the front main body part shell is provided with the left oil cylinder inner containing cavity and the right oil cylinder inner containing cavity which are shared.

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

Claims (11)

1. The utility model provides a thin coal seam compact coal-winning machine swing arm which characterized in that: the device comprises a swing arm shell, wherein the main body of the swing arm shell is an arm support extending leftwards and rightwards, a rear-stage cutting transmission mechanism is installed in the arm support, the ends of an input end gear and an output end gear of the rear-stage 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, a rear arm is arranged behind the high-speed end of the arm support, one end of the rear arm is of a cantilever structure connected to the arm support, a front hinge connecting hole and a rear hinge connecting hole are respectively arranged on the front arm and the rear arm, the front hinge connecting hole, the rear hinge connecting hole and the input end gear are coaxial, a semi-closed oil cylinder outer accommodating cavity is arranged at the lower part of the connecting arm, oil cylinder outer accommodating cavity front and rear cavity walls are respectively provided with an oil cylinder outer pin hole for hinge-adjusting the oil cylinder, and the axis of the oil cylinder outer pin hole extends forwards and backwards, the oil cylinder outer containing cavity is located in the position, close to the front end, of the middle of the connecting arm in the front-back direction, and the oil cylinder outer pin hole is close to the low-speed end of the arm support in the left-right direction.

2. The swing arm for a thin seam compact shearer according to claim 1, wherein: the left and right width of the middle upper part of the connecting arm is the narrowest, the left and right width of the connecting arm 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 top surface of the connecting arm in the left and right directions is higher as the top surface of the connecting arm is closer to the high-speed end of the arm support.

3. The swing arm for a thin seam compact shearer according to 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 inward concave arc cylindrical surface coaxial with the output end gear of the rear-stage cutting transmission mechanism.

4. The swing arm for a thin seam compact shearer according to claim 3, wherein: the cutting mechanism is characterized by further comprising a planetary speed reducing mechanism, wherein a gear ring of the planetary speed reducing mechanism is mounted at the front part of the low-speed end of the arm support, and a sun gear of the planetary speed reducing mechanism is in coaxial transmission connection with an output end gear of the rear-stage cutting transmission mechanism.

5. The swing arm for a thin seam compact shearer according to claim 1, 2, 3 or 4, wherein: and a window is formed in the side wall of the coal wall of the oil cylinder outer accommodating cavity.

6. The utility model provides a thin coal seam compact coal-winning machine swing arm bearing structure which characterized in that: the swing arm comprises a front main body part shell, a rear main body part shell, a height-adjusting oil cylinder and the swing arm of the thin seam compact coal mining machine as claimed in claim 1, 2, 3, 4 or 5, wherein the front main body part shell and the rear main body part shell are butted and fixed in a front-back manner, 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 middle groove is formed between the second lug seat and the connecting base, the rear main body part shell comprises a rear base body and a third lug seat which is positioned in front of the middle part of the rear base body and stretches towards the right or left, a rear groove is formed between the third lug seat and the rear base body, a front cutting transmission mechanism and a cutting motor are arranged in the front main body part shell, the front cutting transmission mechanism comprises an input gear, an idler wheel group and an output gear which are sequentially arranged in the left-right direction and are connected in a transmission manner, the output shaft of the cutting motor is coaxially connected with the input end gear of the pre-stage cutting transmission mechanism in a transmission way, the output end gear of the pre-stage cutting transmission mechanism is positioned in the connecting base, the high-speed ends and the rear arms of the front arm and the arm support are respectively inserted into the front groove, the middle groove and the rear groove, wherein the front arm is hinged with the first ear seat and the second ear seat, the rear arm is hinged with the third ear seat and the rear base body, the output end gear of the front stage cutting transmission mechanism is coaxially connected with the input end gear of the rear stage cutting transmission mechanism in a transmission way, and is coaxial with the front hinge connecting hole, the lower part of the right end or the left end of the front main body part shell is provided with a semi-closed oil cylinder inner accommodating cavity, the heightening oil cylinder is positioned in an oil cylinder accommodating cavity consisting of an oil cylinder outer accommodating cavity and an oil cylinder inner accommodating cavity, 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 front main body part shell, and an interval is kept between the outer surface of the cavity wall of the outer containing cavity of the oil cylinder and the outer surface of the cavity wall of the inner containing cavity of the oil cylinder, which face each other.

7. The swing arm support structure for a thin seam compact shearer according to claim 6, wherein: the input end gear core part of the rear-stage cutting transmission mechanism is provided with a rear-stage spline hole, a spline sleeve with an internal spline and an external spline is installed in the rear-stage spline hole, and the spline hole of the spline sleeve and the spline hole of the output end gear core part of the front-stage cutting transmission mechanism are simultaneously connected with one spline shaft spline.

8. The swing arm support structure for a thin seam compact shearer according to claim 7, wherein: the ear hole of the first ear seat and the ear hole of the front part of the second ear seat are respectively provided with a front wear-resistant sleeve, the ear hole of the third ear seat and the ear hole of the front part of the rear base body are respectively provided with a rear wear-resistant sleeve, the front hinge connecting hole and the rear hinge connecting hole are respectively provided with a sliding bearing, the sliding bearings in the front hinge connecting hole and the rear hinge connecting hole are respectively sleeved and arranged in the middle parts of the front pin shaft sleeve and the rear pin shaft sleeve, the front part and the rear part of the front pin shaft sleeve are tightly matched with the front wear-resistant sleeve, the front part and the rear part of the rear pin shaft sleeve are tightly matched with the rear wear-resistant sleeve, the inner hole of the front pin shaft sleeve is communicated with the inner hole of the second ear seat, two inner holes are respectively provided with a limiting rod, the rear end of the limiting rod extends into the rear-stage spline hole to axially limit the front end of the spline shaft, the front part of the limiting rod is positioned and fixed relative to the front pin shaft sleeve, and the rest parts of the limiting rod are connected with the front pin shaft sleeve, the inner hole of the second ear seat and the rear stage spline housing are not in contact.

9. The swing arm support structure for a thin seam compact shearer according to claim 8, wherein: the outer surface of the overhanging end of the front arm, the outer surface of the high-speed end of the arm support and the outer surface of the overhanging end of the rear arm on the same swing arm shell are arranged into a first group of convex arc cylindrical surfaces which are coaxial with the front hinge connecting hole, the corresponding front groove, middle groove and rear groove are arranged into a first group of concave arc cylindrical surfaces which are coaxial with the front hinge connecting hole, and the first group of concave arc cylindrical surfaces and the first group of convex arc cylindrical surfaces are in one-to-one correspondence and are spaced from each other; the outer surface of the overhanging end of the first ear seat and the outer surface of the overhanging end of the second ear seat are set to be a second group of convex arc cylindrical surfaces coaxial with the front hinge connecting hole, the corresponding side surface of the connecting arm close to the high-speed end of the arm support is set to be a second group of concave arc cylindrical surfaces coaxial with the front hinge connecting hole, and the second group of convex arc cylindrical surfaces and the second group of concave arc cylindrical surfaces are in one-to-one correspondence and are spaced.

10. The swing arm support structure of the thin seam compact shearer according to claim 6, 7, 8 or 9, wherein: the left and right edges of the front main body shell are respectively provided with the first ear seat, the second ear seat and the connecting base, the rear main body shell is correspondingly provided with the left and right ear seats, the rear groove and the left and right grooves, the swing arm of the thin coal seam compact coal mining machine is hinged with the left and right ends of the front main body shell and the rear main body shell from the left and right sides respectively, two sets of pre-stage cutting transmission mechanisms are arranged in the front main body shell, and the two sets of pre-stage cutting transmission mechanisms share one input gear.

11. The swing arm support structure for a thin seam compact shearer according to claim 10, wherein: the left and right oil cylinder inner accommodating cavities of the front main body part shell are communicated, or the lower part of the front main body part shell is provided with a left and right shared oil cylinder inner accommodating cavity.

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