CN216841658U - Thin coal seam coal mining machine - Google Patents

Abstract

The utility model relates to a thin coal seam coal mining machine, articulate the swing arm casing at the anterior both ends of controlling of main part casing including main part casing and two respectively, all regard as articulated round pin axle with a cutting motor between every swing arm casing and the main part casing, the apron is installed to the uncovered department of front end of main part casing, the swing arm casing, the main part casing, cutting motor encloses into closed hydro-cylinder installation cavity with the apron, two swing arm casing wobbling hydro-cylinders are all installed in the hydro-cylinder installation cavity about the drive, each coal flow back channel is controlled to the rear portion of main part casing is equipped with, the coal flow back channel is by preceding backward extension, notch recess down, this recess rear end is sealed. The utility model discloses can provide great exploitation scope, great cutting power, still help shortening the fuselage, improve the coal flow and load the effect.

Description

Thin coal seam coal mining machine

Technical Field

The utility model relates to a coal-winning machine, especially thin seam coal-winning machine have great mining area and great cutting power.

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 cantilever coal mining machine adopts the upper 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 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 machine body structure cannot perform a straight-pushing cutter process similar to a short-wall coal mining machine, the inclined-cutting cutter feeding at two ends is long in time, and the mining efficiency is limited to a certain extent.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a thin coal seam coal-winning machine can provide great exploitation scope, great cutting power, still helps shortening the fuselage, improves the coal current and loads the effect.

The utility model discloses a main technical scheme has:

the utility model provides a coal mining machine for thin seam, includes main part casing and two swing arm casings that articulate the both ends about the anterior of main part casing respectively, all uses a cutting motor as articulated round pin axle between every swing arm casing and the main part casing, and the relative main part casing of cutting motor is fixed, sets up static seal between cutting motor's shell and the main part casing.

The main body of the swing arm shell is an arm support extending from left to right, 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 and a rear arm which are cantilevered leftwards or rightwards from the connecting arm are arranged on the connecting arm, the high-speed ends of the front arm, the rear arm and the arm support are sequentially arranged at intervals from front to back, a front pin shaft mounting hole and a rear pin shaft mounting hole are respectively arranged on the front arm and the rear arm, the front pin shaft mounting hole and the rear pin shaft mounting hole are coaxial with an input end gear of the cutting transmission mechanism, a first lug seat, a second lug seat and a third lug seat are respectively arranged at the left end and the right end of the front part of the main body shell from front to back in sequence, 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 third lug seat, a rear groove is formed between the third ear seat and the rear part of the main body part shell, the high-speed ends of a front arm, a rear arm and an arm support on the same swing arm shell are correspondingly inserted into a front groove, a middle groove and a rear groove which are positioned on the left side and the right side and are on the same side, each cutting motor is arranged in an inner hole formed by combining an ear hole of a first ear seat, a front pin shaft mounting hole, an ear hole of a second ear seat, a rear pin shaft mounting hole and an ear hole of a third ear seat which are on the left side and the right side and are coaxial, and an output shaft of each cutting motor is coaxially connected with an input gear of a cutting transmission mechanism positioned on the left side and the right side in a transmission manner.

The connecting arm is a flat and thin structure with the left-right width smaller than the upper-lower height, 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 as the top surface of the connecting arm is closer to the high-speed end of the arm support.

And a set of joint bearing is arranged in each front pin shaft mounting hole and each rear pin shaft mounting hole, and the shell of the cutting motor is rotatably supported in the corresponding front pin shaft mounting hole and the corresponding rear pin shaft mounting hole through the joint bearing.

The outer surface of the overhanging end of the front arm on the same swing arm shell is arranged to be an outer convex circular arc cylindrical surface coaxial with the corresponding front pin shaft mounting hole, the groove bottom of the corresponding front groove is arranged to be an open structure communicated with an inner cavity of the main body part shell, the top and bottom edges of the open structure are arranged to be inner concave circular arc cylindrical surfaces coaxial with the ear hole of the second ear seat, and the outer surface of the overhanging end of the front arm is in coaxial sliding fit with the top and bottom edges.

The outer surface of the overhanging end of the rear arm and the outer surface of the high-speed end of the arm support on the same swing arm shell are both arranged into convex arc cylindrical surfaces coaxial with the front pin shaft mounting hole, the groove bottoms of the corresponding middle groove and the rear groove are both arranged into concave arc cylindrical surfaces coaxial with the lug hole of the second lug seat, and a gap is reserved between the outer surface of the overhanging end of the rear arm and the outer surface of the high-speed end of the arm support and the middle groove and the rear groove respectively; the outer surfaces of the overhanging ends of the first ear seat, the second ear seat and the third ear seat are all arranged into convex arc cylindrical surfaces which are coaxial with the ear holes of the second ear seat, the side surface, close to the high-speed end of the arm support, of the connecting arm is arranged into a concave arc cylindrical surface, and intervals are reserved between the outer surfaces of the overhanging ends of the first ear seat, the second ear seat and the third ear seat and the side surface, close to the high-speed end of the arm support, of the corresponding connecting arm.

The main part casing is the narrow wide T shape structure in rear portion in front portion, the front portion of main part casing is multi-chamber thin wall frame structure, the left and right parts at the rear portion of main part casing are entity structure.

The utility model discloses a hydraulic cylinder, including main part casing, forearm, main part casing, cutting motor and apron, the apron is installed to the uncovered department of front end of main part casing, closed hydro-cylinder installation cavity is enclosed into to forearm, main part casing, cutting motor and apron, is equipped with two hydro-cylinders in the hydro-cylinder installation cavity, and the one end of two hydro-cylinders articulates respectively on the articulated seat of hydro-cylinder on the overhang of controlling two forearms, and the other end of two hydro-cylinders all articulates on the main part casing.

The rear part of the main body part shell is provided with a left coal flow rear channel and a right coal flow rear channel, the left coal flow rear channel and the right coal flow rear channel are grooves which extend from front to back and have downward notches, the rear ends of the grooves are closed, the bottoms of the coal flow rear channels are high in front and low in rear, and the coal flow rear channels in the left direction and the right direction are respectively positioned between the connecting arms on the same side as the left side and the right side and the low-speed end of the arm support.

And the left and right supporting sliding shoes are respectively positioned behind the low-speed ends of the arm supports of the left and right swing arm shells.

The side surface of the connecting arm close to the low-speed end of the arm support is arranged into an inwards concave arc cylindrical surface coaxial with the output end gear.

The utility model has the advantages that:

the utility model discloses a with the whole round pin axle of swing arm casing and main part casing looks articulated of cutting motor, both shortened the length about the main part casing, just also equal the length about shortened coal-winning machine and hung the fuselage section, simplified cutting mechanism's structure again. Due to the special hinge structure, each swing arm shell is driven by one cutting motor, on the double-drum shearer, the overall cutting power is larger than that of a single cutting motor, and the continuous power consumption of the single cutting motor for cutting hard materials can be reduced during bidirectional mining. The two cutting motors are adopted to respectively carry out left and right main and auxiliary power consumption operation, the overall reliability of the power of the cutting mechanism is favorably improved, and the effect is more obvious when hard materials are cut.

The utility model discloses a high-speed end of forearm, postbrachium and cantilever crane is by the preceding specific structure design who follows interval arrangement in proper order, and forearm and postbrachium are the atress position, and the high-speed end of cantilever crane is the non-atress position, and atress position and non-atress position separate can guarantee that the transmission part that is located the cantilever crane is in good non-atress state, consequently helps improving the transmission precision.

The cutting motor is supported on the front arm and the rear arm through the joint bearing, the concentricity between the front pin shaft mounting hole and the shell of the cutting motor and the concentricity between the front pin shaft mounting hole and the shell of the cutting motor can be kept, and the transmission precision between the cutting motor and the cutting transmission mechanism is improved.

The connecting arm with a special structure basically has no influence on the coal platform above the coal platform in the process of swinging up and down along with the swinging arm shell, and finally the mining range of the whole rocker arm can be enlarged.

The front arm, the main body shell, the cutting motor and the cover plate jointly form a closed cavity, the closed cavity simultaneously provides a clean operation space for the left heightening oil cylinder and the right heightening oil cylinder, the whole space is compact, the length of the machine body is short, the swinging arm is guaranteed not to be influenced by mineral aggregates such as coal and the like in the swinging process along with the stretching of the heightening oil cylinders, the guarantee is provided for the swinging arm to normally swing between the highest swing angle position and the lowest swing angle position, and finally the maximum mining range is guaranteed not to be influenced.

The side surface of the connecting arm far away from the machine body is set to be an inward concave circular arc cylindrical surface coaxial with the output end gear of the cutting transmission mechanism, a certain gap is kept between the inward concave circular arc cylindrical surface and the roller blade, and the loading effect of the roller for spirally conveying materials can be improved.

Two coal flows back channels are arranged at the rear part of the main body part shell, so that the coal flows are guided to enter a conveying groove of a conveyor below the rear part of the main body part shell, and the coal loading effect is improved.

Furthermore, the left and right supporting sliding shoes are arranged, the two guide plates which face to the left rear side and the right rear side are arranged on the supporting sliding shoes respectively, coal thrown out of the roller is guided to be distributed to the left rear side and the right rear side of the roller by the guide plates, and the coal flow is divided left and right by the supporting sliding shoes, so that the influence of the coal flow outside the center line of the roller on the coal flow inside when the coal mining machine moves is reduced. The structure is combined with the coal flow rear channel, so that the coal flow at the inner side can conveniently enter the conveying groove, and the coal loading effect is further improved.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the thin seam coal mining machine according to the present invention;

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

FIG. 3 is a side view of FIG. 1;

FIG. 4 is a partial schematic structural view of a connection structure of the left rocker arm and the main body housing in FIG. 1;

FIG. 5 is a cross-sectional view B-B of FIG. 4;

fig. 6 is a schematic structural view of the main body housing in fig. 1.

Reference numerals are as follows:

1. a rocker arm; 11. a swing arm housing; 111. a forearm; 1111. the cantilever end outer surface of the forearm; 112. a rear arm; 113. a boom; 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; 12. a cutting transmission mechanism; 13. a drum; 14. a knuckle bearing; 15. a mandrel;

2. a main body housing; 215. the outer surface of the overhanging end of the first ear mount; 216. an open top and bottom edge; 217. a front groove; 218. a middle groove; 219. a rear groove; 22. an oil cylinder installation cavity; 23. a cover plate; 26. a coal flow back channel;

3. a cutting motor;

4. an oil cylinder;

5. supporting the slipper; 51. a baffle;

9. a conveyor; 91. a shovel plate; 95. a conveying trough.

Detailed Description

The utility model discloses a coal mining machine for thin coal seams, as shown in fig. 1-6, including main part casing 2 and two swing arm casings 11 that articulate respectively at the both ends about the front portion of main part casing, all regard as articulated round pin axle with a cutting motor 3 between every swing arm casing and the main part casing, the relative main part casing of cutting motor is fixed, and relative swing arm casing swings. Static seal is arranged between the shell of the cutting motor and the shell of the main body part. The cutting motor is integrally used as the pin shaft, so that the left and right length of the main body shell is shortened, the left and right length of the coal cutter suspension body section is shortened, and the structure of the cutting mechanism is simplified. Due to the special hinge structure, each swing arm shell is driven by one cutting motor, on the double-drum shearer, the overall cutting power is larger than that of a single cutting motor, and the continuous power consumption of the single cutting motor for cutting hard materials can be reduced during bidirectional mining. The two cutting motors are adopted to respectively carry out left and right main and auxiliary power consumption operation, the overall reliability of the power of the cutting mechanism is favorably improved, and the effect is more obvious when hard materials are cut.

The main body of the swing arm shell is a cantilever crane 113 extending left and right, and a cutting transmission mechanism 12 is arranged 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 (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. The middle part of the arm support is provided with a connecting arm 114 which is suspended from the arm support to the front, the connecting arm is provided with a front arm 111 and a rear arm 112 which are suspended from the connecting arm to the left or the right, the high-speed ends of the front arm, the rear arm and the arm support 113 are parallel to each other and are arranged at intervals from the front to the rear in sequence, namely, for the right swing arm shell of the coal mining machine, the front arm and the rear arm are suspended from the connecting arm to the left; for the left swing arm housing of the shearer, the front arm and the rear arm are cantilevered rightward from the connecting arm. The front arm and the rear arm are respectively provided with a front pin shaft mounting hole and a rear pin shaft mounting hole which are coaxial with an input end gear of the cutting transmission mechanism. The front pin shaft mounting hole and the rear pin shaft mounting hole are used for mounting a cutting motor, and the front pin shaft mounting hole and the rear pin shaft mounting hole are coaxial with the input end gear mounting hole, so that the mounted cutting motor and the input end gear can transmit power coaxially. The left end and the right end of the front part of the main body part shell are respectively provided with a first ear seat, a second ear seat and a third ear seat from front to back in sequence, a front groove 217 is formed between the first ear seat and the second ear seat, a middle groove 218 is formed between the second ear seat and the third ear seat, and a rear groove 219 is formed between the third ear seat and the rear part of the main body part shell. The high-speed ends of a front arm, a rear arm and an arm support on the same swing arm shell are correspondingly inserted into a front groove, a middle groove and a rear groove which are positioned on the left side and the right side and are on the same side, each cutting motor is arranged in an inner hole formed by combining an ear hole of a first ear seat, a front pin shaft mounting hole, an ear hole of a second ear seat, a rear pin shaft mounting hole and an ear hole of a third ear seat which are on the left side and the right side and are coaxial, and an output shaft of each cutting motor is coaxially connected with an input end gear of a cutting transmission mechanism positioned on the left side and the right side in a transmission manner.

The shearer roller 13 and the planetary speed reducing mechanism are both arranged at the low-speed end of the arm support, and the planetary speed reducing mechanism is positioned at the core part of the roller. 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 main body casing through the connecting arm, the front arm and the rear arm. The front arm and the rear arm are stressed parts, the high-speed end of the arm support is an unstressed part, and the stressed parts are separated from the unstressed parts, so that the transmission part in the arm support can be ensured to be in a good unstressed state, and the transmission precision is improved.

The thin seam coal mining machine is further provided with a clutch mechanism, an output shaft of the cutting motor is a hollow shaft, and a mandrel 15 of the clutch mechanism penetrates through the output shaft of the cutting motor. When the clutch mechanism is in the 'on' position (namely the clutch mechanism is in the position for playing a transmission role), the front spline shaft section and the rear spline shaft section of the mandrel are in spline connection with the motor spline hole of the hollow shaft and the spline hole of the spline housing arranged on the input end gear core part respectively. When the clutch mechanism is pulled out backwards to enable the clutch mechanism to be in a separated position, the spline joint at the front position is completely separated, most of the spline joint at the rear position is separated, and the local part of the spline joint still keeps a connected state. The spline connection structure in floating connection is adopted between the output shaft of the cutting motor and the mandrel of the clutch mechanism, so that the transmission precision between the cutting motor and the cutting transmission mechanism is improved, the concentricity of relevant structures is kept, and the processing and manufacturing are facilitated.

The connecting arm is a flat and thin structure with the left-right width smaller than the upper-lower height, 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 as the top surface of the connecting arm is closer to the high-speed end of the arm support. The connecting arm with the structure basically has no influence on the coal table above in the process of swinging up and down along with the swinging arm shell, and finally the mining range of the whole swinging arm can be enlarged.

Each of the front pin shaft mounting holes and the rear pin shaft mounting holes is provided with a set of joint bearing 14, and the shell of the cutting motor is rotatably supported in the corresponding front pin shaft mounting hole and the corresponding rear pin shaft mounting hole through the joint bearing. The 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. The load at the hinged part is mostly born by the joint bearing, so that the swing arm shell, the machine body shell and the cutting motor can be well protected from or hardly influenced, and the connection reliability is kept.

The outer surface 1111 of the overhanging end of the front arm on the same swing arm shell is preferably set to be an outer convex circular arc cylindrical surface coaxial with the corresponding front pin shaft mounting hole, the groove bottom of the corresponding front groove is set to be an open structure communicated with an inner cavity of the main body part shell, the top and bottom edges 216 of the open structure are all set to be inner concave circular arc cylindrical surfaces coaxial with the ear hole of the second ear seat, and the outer surface 1111 of the overhanging end of the front arm is in coaxial sliding fit with the top and bottom edges. The structural design of the front arm and the front groove ensures that the front arm and the front groove can swing relative to each other and simultaneously can keep the space between the front arm and the front groove and the inner cavity of the main body part shell clean.

The outer surface of the overhanging end of the rear arm and the outer surface of the high-speed end of the arm support on the same swing arm shell are both arranged to be convex arc cylindrical surfaces coaxial with the front pin shaft mounting hole, the groove bottoms of the corresponding middle groove and the rear groove are both arranged to be concave arc cylindrical surfaces coaxial with the lug hole of the second lug seat, and intervals are reserved between the outer surface of the overhanging end of the rear arm and the outer surface of the high-speed end of the arm support and the middle groove and the rear groove respectively. By controlling the width of the gap between the convex arc-shaped cylindrical surface and the corresponding concave arc-shaped cylindrical surface within a proper range, the coal rock can be effectively controlled to be accumulated between the swing arm and the main body part shell in the process that the swing arm shell rotates relative to the main body part shell.

The cantilever end outer surface 215 of the first ear seat, the cantilever end outer surface of the second ear seat and the cantilever end outer surface of the third ear seat are all arranged into convex arc cylindrical surfaces coaxial with the ear hole of the second ear seat, the side surface 1141, close to the high-speed end of the arm support, on the connecting arm is arranged into a concave arc cylindrical surface, and intervals are reserved between the cantilever end outer surfaces of the first ear seat, the second ear seat and the third ear seat and the side surface, close to the high-speed end of the arm support, on the corresponding connecting arm. By controlling the width of the gap between the concave arc-shaped cylindrical surface and the corresponding convex arc-shaped cylindrical surface within a proper range, the coal rock can be effectively controlled to be accumulated and enter between the rocker arm and the main body part shell to cause a blocking in the process that the rocker arm 1 rotates relative to the main body part shell 2, and the free swing of the swing arm shell is guaranteed.

The main body part shell is of a T-shaped structure with a narrow front part and a wide rear part, the front part of the main body part shell is of a multi-chamber thin-wall frame structure, and the left large part and the right large part of the rear part of the main body part shell are of solid structures, so that the gravity center of the whole coal mining machine can move backwards, and the stress stability of the whole coal mining machine is improved.

The utility model discloses a hydraulic cylinder, including main part casing, front arm, main part casing, cutting motor and apron, apron 23 is installed to the uncovered department of front end of main part casing, closed hydro-cylinder installation cavity 22 is enclosed into to forearm, main part casing, cutting motor and apron, and two hydro-cylinders 4 about being equipped with in the hydro-cylinder installation cavity, the one end of two hydro-cylinders articulate respectively about on the articulated seat of hydro-cylinder on the overhang of two forearms, and the other end of two hydro-cylinders all articulates on the main part casing. The oil cylinder can drive the front arm to swing around the cutting motor by stretching and retracting, and further drive the swing arm shell to swing up and down. The oil cylinder hinge seat is a hinge seat with double connecting lugs. The closed cavity simultaneously provides a clean operation space for the left heightening oil cylinder and the right heightening oil cylinder, the whole space is compact, the length of the machine body is short, the swing arm is guaranteed not to be influenced by mineral aggregates such as coal in the process of swinging along with the stretching of the heightening oil cylinder, the swing arm can normally swing between the highest limit swing angle position and the lowest limit swing angle position, and finally the maximum mining range is guaranteed not to be influenced.

The rear part of the main body part shell is provided with a left coal flow rear channel 26 and a right coal flow rear channel 26, the left coal flow rear channel and the right coal flow rear channel are grooves which extend from front to back and have downward notches, the rear ends of the grooves are closed, the bottoms of the coal flow rear channels are high in front and low in rear, and the coal flow rear channels in the left direction and the right direction are respectively positioned between the connecting arms on the same side as the left side and the right side and the low-speed end of the arm support. The coal flow rear channel can guide the coal flow to enter the conveying groove 95 of the conveyor 9 positioned below the rear part of the main body part shell, and the coal charging effect is improved.

Further, the thin seam mining machine further comprises a supporting skid shoe 5 with a guide, which is supported on a shovel plate 91 of the conveyor. The left and right supporting shoes are respectively fixed in front of the left and right ends of the rear part of the main body part shell. In the front-rear direction, the support shoes are located behind, preferably directly behind, the low-speed ends of the respective booms. Two guide plates 51 inclined toward the left rear and the right rear are provided on the support shoe. The guide plate can guide coal thrown and thrown out by the roller to be distributed to the left rear part and the right rear part of the roller, the supporting sliding shoes play a role in separating coal flows inside and outside from each other, and the influence of the coal flow outside the central line of the roller on the coal flow inside the roller when the coal mining machine moves is reduced. The arrangement of the supporting sliding shoes and the guide plate is combined with a coal flow rear channel, so that coal flow on the inner side of the roller can conveniently enter the conveying groove, and the coal charging effect is improved.

The side surface 1142 of the connecting arm near the low-speed end of the arm support is arranged to be an inward concave circular cylindrical surface coaxial with the output end gear. The concave arc cylindrical surface can keep a certain gap with the roller blade, and the loading effect of the roller for spirally conveying materials is improved.

As used herein, unless specifically indicated, fore and aft refer to directions toward and away from the coal wall, respectively.

Claims (11)

1. A thin coal seam coal mining machine is characterized in that: the cutting machine comprises a main body shell and two swing arm shells hinged to the left end and the right end of the front portion of the main body shell respectively, a cutting motor serves as a hinge pin shaft between each swing arm shell and the main body shell, the cutting motor is fixed relative to the main body shell, and a static seal is arranged between the shell of the cutting motor and the main body shell.

2. The thin seam shearer of claim 1, wherein: the main body of the swing arm shell is an arm support extending from left to right, 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 and a rear arm which are cantilevered leftwards or rightwards from the connecting arm are arranged on the connecting arm, the high-speed ends of the front arm, the rear arm and the arm support are sequentially arranged at intervals from front to back, a front pin shaft mounting hole and a rear pin shaft mounting hole are respectively arranged on the front arm and the rear arm, the front pin shaft mounting hole and the rear pin shaft mounting hole are coaxial with an input end gear of the cutting transmission mechanism, a first lug seat, a second lug seat and a third lug seat are respectively arranged at the left end and the right end of the front part of the main body shell from front to back in sequence, 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 third lug seat, a rear groove is formed between the third ear seat and the rear part of the main body part shell, the high-speed ends of a front arm, a rear arm and an arm support on the same swing arm shell are correspondingly inserted into a front groove, a middle groove and a rear groove which are positioned on the left side and the right side and are on the same side, each cutting motor is arranged in an inner hole formed by combining an ear hole of a first ear seat, a front pin shaft mounting hole, an ear hole of a second ear seat, a rear pin shaft mounting hole and an ear hole of a third ear seat which are on the left side and the right side and are coaxial, and an output shaft of each cutting motor is coaxially connected with an input gear of a cutting transmission mechanism positioned on the left side and the right side in a transmission manner.

3. The thin seam shearer of claim 2, wherein: the connecting arm is a flat and thin structure with the left-right width smaller than the upper-lower height, 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 as the top surface of the connecting arm is closer to the high-speed end of the arm support.

4. The thin seam shearer according to claim 3, characterized in that: and each of the front pin shaft mounting holes and the rear pin shaft mounting holes is provided with a set of joint bearing, and a shell of the cutting motor is rotatably supported in the corresponding front pin shaft mounting hole and the corresponding rear pin shaft mounting hole through the joint bearing.

5. The thin seam shearer of claim 4, wherein: the overhanging end outer surface of the front arm on the same swing arm shell is arranged to be an outer convex circular arc cylindrical surface coaxial with the corresponding front pin shaft mounting hole, the groove bottom of the corresponding front groove is arranged to be an open structure communicated with an inner cavity of the main body part shell, the top and bottom edges of the opening are arranged to be inner concave circular arc cylindrical surfaces coaxial with the ear hole of the second ear seat, and the overhanging end outer surface of the front arm is in coaxial sliding fit with the top and bottom edges.

6. The thin seam shearer according to claim 5, characterized in that: the outer surface of the overhanging end of the rear arm and the outer surface of the high-speed end of the arm support on the same swing arm shell are both arranged into convex arc cylindrical surfaces coaxial with the front pin shaft mounting hole, the groove bottoms of the corresponding middle groove and the rear groove are both arranged into concave arc cylindrical surfaces coaxial with the lug hole of the second lug seat, and a gap is reserved between the outer surface of the overhanging end of the rear arm and the outer surface of the high-speed end of the arm support and the middle groove and the rear groove respectively; the outer surfaces of the overhanging ends of the first ear seat, the second ear seat and the third ear seat are all arranged into convex arc cylindrical surfaces which are coaxial with the ear holes of the second ear seat, the side surface, close to the high-speed end of the arm support, of the connecting arm is arranged into a concave arc cylindrical surface, and intervals are reserved between the outer surfaces of the overhanging ends of the first ear seat, the second ear seat and the third ear seat and the side surface, close to the high-speed end of the arm support, of the corresponding connecting arm.

7. The thin seam shearer according to claim 6, wherein: the main part casing is the narrow wide T shape structure in rear portion in front portion, the front portion of main part casing is multi-chamber thin wall frame structure, the left and right parts at the rear portion of main part casing are entity structure.

8. The thin seam shearer of claim 7, wherein: the utility model discloses a hydraulic cylinder, including main part casing, forearm, main part casing, cutting motor and apron, the apron is installed to the uncovered department of front end of main part casing, forearm, main part casing, cutting motor and apron enclose into closed hydro-cylinder installation cavity, are equipped with two hydro-cylinders in the hydro-cylinder installation cavity, and the one end of two hydro-cylinders articulates respectively on the hydro-cylinder articulated seat on the overhanging end of controlling two forearms, and the other end of two hydro-cylinders all articulates on the main part casing.

9. The thin seam mining machine of claim 2, 3, 4, 5, 6, 7 or 8, characterized by: the rear part of the main body part shell is provided with a left coal flow rear channel and a right coal flow rear channel, the left coal flow rear channel and the right coal flow rear channel are grooves which extend from front to back and have downward notches, the rear ends of the grooves are closed, the bottoms of the coal flow rear channels are high in front and low in rear, and the coal flow rear channels in the left direction and the right direction are respectively positioned between the connecting arms on the same side as the left side and the right side and the low-speed end of the arm support.

10. The thin seam shearer of claim 9, wherein: and the left and right supporting sliding shoes are respectively positioned behind the low-speed ends of the arm supports of the left and right swing arm shells.

11. The thin seam shearer of claim 10, wherein: the side surface of the connecting arm close to the low-speed end of the arm support is arranged into an inwards concave arc cylindrical surface coaxial with the output end gear.

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