Power connection structure of swing arm of thin seam coal mining machine

Abstract

The present application relates to a kind of power connection structure of thin coal seam coal cutter swing arm, including cutting motor, swing arm shell and main part shell, swing arm shell and main part shell are hinged with cutting motor as pin shaft, cutting motor is fixed relative to main part shell, cutting transmission mechanism is provided in swing arm shell, the input end gear of cutting transmission mechanism is coaxially transmission connection with the output shaft of cutting motor by clutch mechanism, when clutch mechanism is in transmission position, the front outer spline on the mandrel of clutch mechanism is formed with a motor spline hole on the output shaft of cutting motor key connection, the rear outer spline on the mandrel is formed with the inner spline of gear spline sleeve key connection, gear spline sleeve is installed in the gear spline hole of the core of input end gear.The present application can provide larger mining range, shorten body and improve the problem of coal cutter gravity center.

Description

Technical Field

[0001] This invention relates to a mechanical connection structure for inputting power from a cutting motor into the swing arm of a coal mining machine, for use in situations where there is relative rotation between the cutting motor and the swing arm. Background Technology

[0002] On existing thin coal seam mining machines, the cutting motor is usually located on the rocker arm and swings with the rocker arm. When the rear rocker arm of this type of thin coal seam suspended mining machine is cutting the upper cutter in the direction of travel, the problem of insufficient rear drum mining height occurs. This is because if the mining height is increased further, the cutting motor of the rear rocker arm will interfere with the upper coal platform left behind the bottom cutter of the front drum. Therefore, the overall mining height of this type of mining machine is too narrow and cannot meet the mining requirements of thin coal seam working faces with large variations in ore thickness in my country.

[0003] To address the aforementioned issues, industry experts have proposed dividing the cutting section into a swing section and a fixed section, with the main components of the cutting motor and transmission system located in the fixed section. However, this resulted in an overly complex fixed section structure, with the overhanging section of the machine being excessively long and heavy. The overall center of gravity still significantly impacts the machine's stress distribution. Furthermore, the long-bodied coal mining machine cannot execute the straight-push cutting process similar to short-wall coal mining machines, as the oblique cutting at both ends takes a considerable amount of time, thus limiting mining efficiency. Summary of the Invention

[0004] The present invention aims to provide a power connection structure for the swing arm of a thin coal seam mining machine, which can not only provide a larger mining range, but also shorten the machine body and improve the center of gravity of the mining machine.

[0005] The main technical solutions of this invention are as follows:

[0006] A power connection structure for a swing arm of a thin coal seam mining machine includes a cutting motor, a swing arm housing, and a main body housing. The swing arm housing and the main body housing are hinged with the cutting motor as a pin. The cutting motor is fixed relative to the main body housing. A cutting transmission mechanism is provided inside the swing arm housing. The input gear of the cutting transmission mechanism is coaxially connected to the output shaft of the cutting motor through a clutch mechanism.

[0007] The main body of the swing arm housing is a boom extending left and right. A cutting transmission mechanism is installed inside the boom. The input and output gears of the cutting transmission mechanism serve as the high-speed and low-speed ends of the boom, respectively. A connecting arm extends forward from the middle of the boom. A forearm and rear arm extend to the left or right from the connecting arm. The forearm, rear arm, and the high-speed end of the boom are parallel to each other and arranged alternately from front to back. The forearm and rear arm each have a front pin mounting hole and a rear pin mounting hole, respectively. Both the front and rear pin mounting holes are connected to the cutting transmission mechanism. The input end gear is coaxial. The left or right edge of the front part of the main body housing is provided with a first ear seat, a second ear seat and a third ear seat from front to back. A front groove is formed between the first ear seat and the second ear seat, a middle groove is formed between the second ear seat and the third ear seat, and a rear groove is formed between the third ear seat and the rear part of the main body housing. The high-speed ends of the forearm, the rear arm and the boom are inserted into the front groove, the middle groove and the rear groove respectively. The cutting motor is installed in the inner hole formed by the ear hole of the first ear seat, the front pin mounting hole, the ear hole of the second ear seat, the rear pin mounting hole and the ear hole of the third ear seat.

[0008] The housing of the cutting motor can be rotatably supported in the front and rear pin mounting holes by sliding bearings.

[0009] The sliding bearing is preferably a heavy-duty spherical bearing.

[0010] The casing of the cutting motor adopts a thick-walled structure. The surface of the casing is provided with a first circular convex stop, a second circular convex stop, a third circular convex stop, and a fourth circular convex stop in sequence from front to back. The rear part of the ear hole of the first ear seat, the front and rear parts of the ear hole of the second ear seat, and the front part of the ear hole of the third ear seat are respectively provided with a coaxial first circular concave stop, a second circular concave stop, a third circular concave stop, and a fourth circular concave stop. The first to fourth circular convex stops correspond to the first to fourth circular concave stops one by one and fit tightly.

[0011] The clutch mechanism includes a spindle, a gear spline sleeve, and a clutch device. The spindle has a front external spline and a rear external spline. The clutch device is connected to the rear of the spindle. The clutch mechanism is slidably connected to the boom. The core of the input gear of the cutting transmission mechanism has a gear spline hole. The gear spline sleeve is splinedly connected in the gear spline hole and axially fixed relative to the gear spline hole. The output shaft of the cutting motor is a hollow shaft with a motor spline hole inside. The clutch mechanism is connected to the cutting motor and the input gear of the cutting transmission mechanism through one of the following two structures: Structure 1: The motor spline hole is located at the front of the hollow shaft. The spindle is a long shaft. When the clutch mechanism is in the front extreme position, the front external spline of the spindle forms a spline connection with the motor spline hole, and the rear external spline of the spindle forms a spline connection with the inner spline of the gear spline sleeve. When the clutch mechanism is in the rearmost position, the front external spline of the spindle disengages from the motor spline hole, while the front end of the rear external spline of the spindle remains partially splined with the rear end of the inner spline of the gear spline sleeve. In structure two, the motor spline hole is located at the rear of the hollow shaft, and a motor spline sleeve is installed in the motor spline hole, with the motor spline sleeve axially fixed relative to the hollow shaft. The spindle is a short shaft. When the clutch mechanism is in the frontmost position, the front external spline of the spindle forms a splined connection with the inner spline of the motor spline sleeve, and the rear external spline of the spindle forms a splined connection with the inner spline of the gear spline sleeve. When the clutch mechanism is in the rearmost position, the front external spline of the spindle disengages from the inner spline of the motor spline sleeve, while the front end of the rear external spline of the spindle remains partially splined with the rear end of the inner spline of the gear spline sleeve.

[0012] The power connection structure of the swing arm of the thin coal seam mining machine also includes a rolling support assembly. For structure one, the rolling support assembly is fixed in front of the spline hole of the motor. For structure two, the rolling support assembly is fixed in front of the spline sleeve of the motor. A guide optical shaft section is provided in front of the front outer spline on the spindle. The guide optical shaft section passes through the rolling support assembly and is supported in the rolling support assembly. A rolling element is provided in the rolling support assembly, and the guide optical shaft section contacts the rolling element.

[0013] The power connection structure of the swing arm of the thin coal seam mining machine also includes an elastic guide sleeve. The elastic guide sleeve is sleeved and fixed on the rear of the outer spline on the spindle. The elastic guide sleeve is slidably connected to the light hole behind the gear spline hole in the core of the input end gear.

[0014] The boom cavity is also equipped with an intermediate gear and a gear pump. The input gear of the cutting transmission mechanism meshes with the intermediate gear, and the intermediate gear is coaxially connected to the gear pump.

[0015] The beneficial effects of this invention are:

[0016] By using the entire cutting motor as a pivot, the lateral length of the main body housing is shortened, which is equivalent to shortening the lateral length of the coal mining machine's suspension section, and the structure of the cutting mechanism is simplified. The swing arm housing contains a cutting transmission mechanism, which uses a clutch mechanism to transmit the power output from the cutting motor to the cutting transmission mechanism, thus realizing the power connection of the coal mining machine's swing arm.

[0017] The external load on the roller can be transmitted to the main body housing through the connecting arm, front arm, and rear arm. The front arm and rear arm are the load-bearing parts, while the high-speed end of the boom is the non-load-bearing part. The separation of the load-bearing and non-load-bearing parts ensures that the transmission part located within the boom is in a good non-load-bearing state, thus helping to improve transmission accuracy.

[0018] The housing of the cutting motor is rotatably supported in the front and rear pin mounting holes by heavy-duty spherical bearings. Because these spherical bearings have a large load-bearing capacity, they are impact-resistant, corrosion-resistant, wear-resistant, and have a self-aligning function, which helps to maintain the concentricity between the front and rear pin mounting holes and the housing of the cutting motor.

[0019] By providing a friction-reducing layer between the inner and outer rings of the spherical plain bearing, wear on the bearing sliding pair can be reduced. Preferably, both ends of the friction-reducing layer are sealed. Using this spherical plain bearing can improve the service life of the sliding pair and also helps to improve the transmission accuracy between the cutting motor and the cutting drive mechanism.

[0020] The outer casing of the cutting motor has first to fourth circular convex stops from front to back. Correspondingly, the ear holes of the corresponding lugs in the main body casing have first to fourth circular concave stops from front to back. The first to fourth circular convex stops and the first to fourth circular concave stops are tightly fitted together to achieve a fixed connection between the cutting motor and the main body casing. The first two pairs of mating stops and the last two pairs of mating stops each form a set. These two sets of mating stops are used to better balance the forces on the forearm and rear arm, respectively. The use of two sets of mating stops also helps to balance the forces on the entire swing arm casing.

[0021] For the clutch mechanism using structure one, the input end gear is connected to the rear part of the clutch mechanism spindle by a gear spline sleeve to form a two-stage spline connection, which increases the floating amount between the spindle and the input end gear, and also increases the floating amount between the output shaft and the input end gear of the cutting motor. Even if the rotation center of the cutting motor changes due to wear from long-term use, the power transmission will not be adversely affected.

[0022] For the clutch mechanism using structure two, the addition of the motor spline sleeve further increases the floating amount, thus further improving the adaptability of the power connection structure.

[0023] Regardless of the specific structure of the clutch mechanism, the addition of rolling support components and elastic guide sleeves further increases the overall floating range of the clutch mechanism, thereby enhancing the adaptability of the swing arm housing to potential jumping relative to the cutting motor.

[0024] This invention is a power connection structure specially designed for the cutting part in which the cutting motor acts as a pin to support the swing arm housing to swing up and down. This structure is well adapted to the problem of misalignment between the output shaft of the cutting motor and the input gear of the cutting transmission mechanism caused by long-term use, thus improving the reliability of cutting power transmission.

[0025] In addition to driving the rotation of other parts of the cutting transmission mechanism, the input gear also drives the intermediate gear and the gear pump. The intermediate gear and the gear pump constitute the power source of the hydraulic system, which is powered by the cutting motor and does not require a separate power source. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of an embodiment of the hinge structure between the swing arm housing and the main body housing of the present invention;

[0027] Figure 2 for Figure 1 A horizontal sectional view.

[0028] Figure 3 for Figure 2 AA section view;

[0029] Figure 4 This is a schematic diagram of the first embodiment of the clutch mechanism of the present invention (the clutch mechanism is in the first extreme position);

[0030] Figure 5 This is a schematic diagram of the first embodiment of the clutch mechanism of the present invention (the clutch mechanism is in the rear limit position);

[0031] Figure 6 This is a schematic diagram of a second embodiment of the clutch mechanism of the present invention (the clutch mechanism is in the first extreme position);

[0032] Figure 7 This is a schematic diagram of a second embodiment of the clutch mechanism of the present invention (the clutch mechanism is in the rear limit position);

[0033] Figure label:

[0034] 1. Swing arm housing; 111. Forearm; 112. Rear arm; 113. Boom; 114. Connecting arm; 12. Cutting transmission mechanism; 121. Input end gear; 122. Planetary reduction mechanism; 123. Intermediate gear; 13. Roller; 14. Sliding bearing; 15. Clutch mechanism; 15'. Clutch mechanism; 151. Spindle; 1511. Guide shaft section; 1512. Front external spline; 1513. Rear external spline; 152. Gear spline sleeve; 1521. Internal spline of gear spline sleeve; 153. Rolling support assembly; 154. Elastic guide sleeve; 155. Clutch device; 156. Motor spline sleeve; 17. Gear pump;

[0035] 2. Main body shell; 211. First circular recessed stop; 212. Second circular recessed stop; 213. Third circular recessed stop; 214. Fourth circular recessed stop; 22. Cylinder mounting cavity; 23. Cover plate;

[0036] 3. Cutting the motor; 31. Motor spline hole;

[0037] 4. Adjust the height of the hydraulic cylinder. Detailed Implementation

[0038] This invention discloses a power connection structure for the swing arm of a thin coal seam mining machine (which may be referred to as the power connection structure), such as... Figure 1-7 As shown, the device includes a cutting motor 3, a swing arm housing 1, and a main body housing 2. The swing arm housing and the main body housing are hinged together by the cutting motor 3 as a pivot. The cutting motor is fixed relative to the main body housing and swings relative to the swing arm housing. By using the entire cutting motor as a pivot, the lateral length of the main body housing is shortened, which is equivalent to shortening the lateral length of the coal mining machine's suspension section, and the structure of the cutting mechanism is simplified. The swing arm housing contains a cutting transmission mechanism 12. The input gear 121 of the cutting transmission mechanism is coaxially connected to the output shaft of the cutting motor through a clutch mechanism 15 or 15'. The clutch mechanism transmits the power output by the cutting motor to the cutting transmission mechanism.

[0039] One end of the height adjustment cylinder 4 is hinged to the swing arm housing, and the other end is hinged to the main body housing. The extension and retraction of the height adjustment cylinder will cause the swing arm housing to swing up and down around the cutting motor.

[0040] The main body of the swing arm housing is a boom 113 extending left and right, and the cutting transmission mechanism is installed inside the boom. The cutting transmission mechanism adopts a fixed-axis gear transmission mechanism. To facilitate the distinction between the two ends of the boom, the ends where the input gear 121 (also the high-speed gear) and the output gear (also the low-speed gear) of the cutting transmission mechanism are located are respectively designated as the high-speed end and the low-speed end of the boom. A connecting arm 114 extending forward from the boom is provided in the middle of the boom. A forearm 111 and a rear arm 112 extending to the left or right from the connecting arm are provided on the connecting arm. The forearm, rear arm, and the high-speed end of the boom are parallel to each other and arranged alternately from front to back. That is, for the right swing arm housing of the coal mining machine, the forearm and rear arm extend to the left from the connecting arm; for the left swing arm housing of the coal mining machine, the forearm and rear arm extend to the right from the connecting arm. The forearm and rear arm are respectively provided with front and rear pin mounting holes, both of which are coaxial with the input gear of the cutting transmission mechanism. These mounting holes are used to install the cutting motor, and their coaxiality with the input gear mounting hole ensures that the installed cutting motor transmits power coaxially with the input gear. The front left or right edge of the main body housing has a first ear seat, a second ear seat, and a third ear seat sequentially arranged from front to back. A front groove is formed between the first and second ear seats, a middle groove is formed between the second and third ear seats, and a rear groove is formed between the third ear seat and the rear part of the main body housing. The high-speed ends of the forearm, rear arm, and boom are correspondingly inserted into the front, middle, and rear grooves, respectively. The cutting motor is installed in the inner hole formed by the combination of the ear holes of the first ear seat, the front pin mounting hole, the second ear seat, the rear pin mounting hole, and the third ear seat.

[0041] Both the coal mining machine drum 13 and the planetary reduction mechanism 122 are installed at the low-speed end of the boom, with the planetary reduction mechanism located in the core of the drum. The planetary reduction mechanism undertakes most of the deceleration work, so the cutting transmission mechanism, which serves as the front-stage deceleration part, can meet the deceleration requirements by using a relatively simple fixed-axis gear transmission mechanism. Consequently, the boom used to accommodate the cutting transmission mechanism has a more regular shape.

[0042] The external load on the roller is transmitted to the main body housing through the connecting arm, front arm, and rear arm. The front arm and rear arm are the load-bearing parts, while the high-speed end of the boom is the non-load-bearing part. The separation of the load-bearing and non-load-bearing parts ensures that the transmission part located within the boom is in a good non-load-bearing state, thus helping to improve transmission accuracy.

[0043] The front of the main body housing has an open inner cavity with a cover plate 23 installed at the front opening. The overhanging end of the forearm extends into the inner cavity through an opening on the bottom of the front groove. The forearm, main body housing, cutting motor, and cover plate enclose the inner cavity to form a cylinder mounting cavity 22. The height adjustment cylinder is located in this cylinder mounting cavity, and one end of the height adjustment cylinder connected to the swing arm housing is hinged to the forearm 111. The cylinder mounting cavity provides a clean working space for the height adjustment cylinder, ensuring that the swing arm housing is not affected by coal or other minerals during the swinging process of the height adjustment cylinder, and also ensuring that the swing arm housing can swing normally between the highest and lowest limit swing angle positions, ultimately ensuring that the maximum mining range is not affected.

[0044] The housing of the cutting motor is rotatably supported in the front and rear pin mounting holes by sliding bearings 14.

[0045] The sliding bearing is preferably a heavy-duty spherical plain bearing, which has a high load capacity, impact resistance, corrosion resistance, wear resistance, and self-aligning properties. Using spherical plain bearings helps maintain the concentricity between the front and rear pin mounting holes and the housing of the cutting motor.

[0046] A friction-reducing layer is provided between the inner and outer rings of the spherical plain bearing to reduce wear on the bearing sliding pair. Preferably, seals are provided at both ends of the friction-reducing layer. Using this spherical plain bearing can improve the service life of the sliding pair and also help improve the transmission accuracy between the cutting motor and the cutting transmission mechanism.

[0047] The casing of the cutting motor preferably adopts a thick-walled structure. From front to back, the casing surface is provided with a first circular raised stop, a second circular raised stop, a third circular raised stop, and a fourth circular raised stop at intervals. The rear part of the ear hole of the first ear seat, the front and rear parts of the ear hole of the second ear seat, and the front part of the ear hole of the third ear seat are respectively provided with a coaxial first circular recessed stop 211, a second circular recessed stop 212, a third circular recessed stop 213, and a fourth circular recessed stop 214. The first to fourth circular raised stops and the first to fourth circular recessed stops are tightly fitted one-to-one, achieving a fixed connection between the cutting motor and the main casing. The first two pairs of mating stop structures and the last two pairs of mating stop structures each form a set, with the front and rear sets used to better balance the forces on the forearm and rear arm, respectively. Simultaneously, the use of two sets of mating stop structures helps to balance the forces on the entire swing arm casing. Each circular raised stop surface may be provided with a sealing groove, and a sealing ring is provided within the sealing groove. The diameter of the first to fourth circular convex stops is preferably gradually decreasing from front to back, which makes it easier to install the cutting motor.

[0048] The clutch mechanisms 15 and 15' include a spindle 151, a gear spline sleeve 152, and a clutch device 155. The spindle has a front external spline 1512 and a rear external spline 1513. The clutch device is connected to the rear of the spindle, and the clutch mechanisms are slidably connected to the boom. The core of the input gear of the cutting transmission mechanism has a gear spline hole, and the gear spline sleeve 152 is splinedly connected in the gear spline hole and axially fixed relative to the gear spline hole. The output shaft of the cutting motor is a hollow shaft, and a motor spline hole 31 is provided inside the hollow shaft.

[0049] The clutch mechanism can be connected to the input gear of the cutting motor and the cutting transmission mechanism through one of the following two structures: Structure 1, see Figure 4 , 5 The motor spline hole 31 is located at the front of the hollow shaft, and the spindle 151 is a long shaft. When the clutch mechanism is in the forward limit position (corresponding to the clutch mechanism being in the position of performing transmission function), the front external spline of the spindle forms a spline connection with the motor spline hole 31, and the rear external spline 1513 of the spindle forms a spline connection with the inner spline 1521 of the gear spline sleeve; when the clutch mechanism is in the rear limit position (corresponding to the clutch mechanism being in the position of disengaging the cutting motor from the cutting transmission system), the front external spline 1512 of the spindle disengages from the motor spline hole 31, and the front end of the rear external spline 1513 of the spindle still maintains a partial spline connection with the rear end of the inner spline 1521 of the gear spline sleeve.

[0050] In the cutting section of this invention, where the cutting motor serves as a pin supporting the swing arm housing's forearm and reararm, the rotation center of the cutting motor may shift relative to the rotation center of the swing arm after prolonged use. This can cause misalignment between the input gear of the cutting transmission system and the cutting motor. By employing the aforementioned structure, a floating spline connection transmission between the output shaft of the cutting motor and the input gear is achieved. Even if misalignment occurs between the input gear and the cutting motor, the power transmission will not be adversely affected.

[0051] Structure 2, see also Figure 6 , 7 The motor spline hole 31 is located at the rear of the hollow shaft. A motor spline sleeve 156 is installed in the motor spline hole and is axially fixed relative to the hollow shaft. The spindle is a short shaft. When the clutch mechanism is in the forward extreme position, the front outer spline 1512 of the spindle forms a spline connection with the inner spline of the motor spline sleeve, and the rear outer spline 1513 of the spindle forms a spline connection with the inner spline of the gear spline sleeve. When the clutch mechanism is in the rear extreme position, the front outer spline 1512 of the spindle disengages from the inner spline of the motor spline sleeve 156, while the front end of the rear outer spline 1513 of the spindle still maintains a partial spline connection with the rear end of the inner spline 1521 of the gear spline sleeve.

[0052] Compared to Structure 1, Structure 2 adds a motor spline sleeve, which can further increase the floating amount.

[0053] Regardless of whether it is structure one or structure two, the power connection structure of the swing arm of the thin coal seam mining machine may further include a rolling support assembly 153. For structure one, the rolling support assembly is fixed in front of the motor spline hole; for structure two, the rolling support assembly is fixed in front of the motor spline sleeve. A guide shaft section 1511 is provided in front of the front outer spline on the spindle, passing through and being supported in the rolling support assembly. The rolling support assembly 153 contains rolling elements, and the guide shaft section 1511 contacts the rolling elements.

[0054] The power connection structure of the swing arm of the thin coal seam mining machine also includes an elastic guide sleeve 154. The elastic guide sleeve is sleeved and fixed on the rear of the outer spline 1513 on the spindle. The elastic guide sleeve is slidably connected to the light hole behind the gear spline hole located in the core of the input end gear.

[0055] The rolling support assembly supports and rolls the front end of the spindle, while the elastic guide sleeve 154 supports and slides the rear end of the spindle. The rolling support assembly and the elastic guide sleeve increase the overall float of the clutch mechanism, which can further accommodate the possible runout of the swing arm housing relative to the cutting motor.

[0056] The boom's inner cavity may also house an intermediate gear 123 and a gear pump 17. The input gear of the cutting transmission mechanism meshes externally with the intermediate gear, and the intermediate gear is coaxially connected to the gear pump. Driven by the cutting motor, the input gear rotates, driving not only other parts of the cutting transmission mechanism but also the intermediate gear and the gear pump. The intermediate gear and the gear pump constitute the power source for the hydraulic system, which is powered by the cutting motor, eliminating the need for a separate power source.

[0057] Unless otherwise specified, "before" and "after" in this article refer to directions closer to the coal face and directions farther from the coal face, respectively.

Claims

1. A power connection structure of a swing arm of a thin seam coal mining machine, characterized by: The cutting motor, the swing arm shell and the main body shell are hinged with the cutting motor as the pin shaft, the cutting motor is fixed relative to the main body shell, the swing arm shell is internally provided with a cutting transmission mechanism, the input end gear of the cutting transmission mechanism is coaxially connected with the output shaft of the cutting motor through a clutch mechanism, the main body of the swing arm shell is a left and right extending arm support, the cutting transmission mechanism is installed in the arm support, the input end gear and the output end gear of the cutting transmission mechanism are respectively taken 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 which is suspended from the arm support to the front, the connecting arm is provided with a front arm and a rear arm which are suspended from the connecting arm to the left or right, the front arm, the rear arm and the high speed end of the arm support are parallel to each other and are sequentially and spaced arranged from front to back, the front arm and the rear arm are respectively provided with front pin shaft mounting holes and rear pin shaft mounting holes, the front pin shaft mounting holes and the rear pin shaft mounting holes are coaxial with the input end gear of the cutting transmission mechanism, the shell of the cutting motor is rotatably supported in the front pin shaft mounting holes and the rear pin shaft mounting holes through sliding bearings; the left edge or the right edge of the front part of the main body shell is sequentially provided with a first lug, a second lug and a third lug from front to back, the first lug and the second lug form a front groove, the second lug and the third lug form a middle groove, the third lug and the rear part of the main body shell form a rear groove, the front arm, the rear arm and the high speed end of the arm support are correspondingly inserted in the front groove, the middle groove and the rear groove, the cutting motor is installed in the inner hole formed by the lug hole of the first lug, the front pin shaft mounting hole, the lug hole of the second lug, the rear pin shaft mounting hole and the lug hole of the third lug, the shell of the cutting motor adopts a thick wall structure, the surface of the shell is sequentially and spaced provided with a first circular convex stop, a second circular convex stop, a third circular convex stop and a fourth circular convex stop from front to back; the rear part of the lug hole of the first lug, the front part and the rear part of the lug hole of the second lug and the front part of the lug hole of the third lug are respectively provided with coaxial first circular concave stops, second circular concave stops, third circular concave stops and fourth circular concave stops, the first to fourth circular convex stops and the first to fourth circular concave stops are one-to-one corresponding and tightly fitted.

2. The power connection structure of a swing arm of a thin seam coal mining machine according to claim 1, characterized in that: The sliding bearing adopts a heavy joint bearing.

3. A power connection structure for a thin seam mining machine swing arm according to claim 1 or 2, characterized in that: The clutch mechanism comprises a mandrel, a gear spline sleeve and a clutch device, the mandrel is provided with front and rear outer splines, the clutch device is connected to the rear of the mandrel, the clutch mechanism is connected to the arm support in a sliding manner, the core of the input end gear of the cutting transmission mechanism is provided with a gear spline hole, the gear spline sleeve is splinedly connected in the gear spline hole and is axially fixed relative to the gear spline hole, the output shaft of the cutting motor is a hollow shaft, the hollow shaft is provided with a motor spline hole, the clutch mechanism is connected with the cutting motor and the input end gear of the cutting transmission mechanism through one of the following two structures: structure one, the motor spline hole is located at the front part of the hollow shaft, the mandrel is a long shaft, when the clutch mechanism is located at the front limit position, the front outer spline of the mandrel is splinedly connected with the motor spline hole, and the rear outer spline of the mandrel is splinedly connected with the inner spline of the gear spline sleeve; when the clutch mechanism is located at the rear limit position, the front outer spline of the mandrel is disconnected with the motor spline hole, and the front end of the rear outer spline of the mandrel still locally keeps splined connection with the rear end of the inner spline of the gear spline sleeve; structure two, the motor spline hole is located at the rear part of the hollow shaft, a motor spline sleeve is installed in the motor spline hole and is axially fixed relative to the hollow shaft, the mandrel is a short shaft, when the clutch mechanism is located at the front limit position, the front outer spline of the mandrel is splinedly connected with the inner spline of the motor spline sleeve, and the rear outer spline of the mandrel is splinedly connected with the inner spline of the gear spline sleeve; when the clutch mechanism is located at the rear limit position, the front outer spline of the mandrel is disconnected with the inner spline of the motor spline sleeve, and the front end of the rear outer spline of the mandrel still locally keeps splined connection with the rear end of the inner spline of the gear spline sleeve.

4. The power connection structure of a swing arm of a thin seam coal mining machine according to claim 3, characterized in that: A rolling support assembly is further included, for structure one, the rolling support assembly is fixed at the front of the motor spline hole, for structure two, the rolling support assembly is fixed at the front of the motor spline sleeve, a guide light shaft section is arranged at the front of the front outer spline of the mandrel, the guide light shaft section passes through and is supported in the rolling support assembly, and the rolling support assembly is provided with a rolling body, and the guide light shaft section is in contact with the rolling body.

5. The power connection structure of a thin seam coal cutter swing arm according to claim 4, characterized in that: An elastic guide sleeve is further included, the elastic guide sleeve is sleeved and fixed at the rear of the rear outer spline of the mandrel, and the elastic guide sleeve is in sliding connection with a light hole at the rear of the gear spline hole of the core of the input end gear.

6. The power connection structure of a thin seam coal cutter swing arm according to claim 5, characterized in that: An intermediate gear and a gear pump are further arranged in the inner cavity of the arm support, the input end gear of the cutting transmission mechanism is in external meshing with the intermediate gear, and the intermediate gear is coaxially connected with the gear pump.

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