Thin seam short span coal cutter cutting mechanism

Abstract

The present application relates to a kind of short span thin coal seam coal cutter cutting mechanism, including cutting motor, swing arm shell and front main body part shell, the main body of swing arm shell is left and right extension's arm support, the connecting arm of middle part of arm support is forward overhanging, connecting arm is equipped with left or right overhanging front arm, the right edge or left edge of front main body part shell is sequentially equipped with first, second ear seat and connecting base from front to back, the high speed end of front arm and arm support and the first, second ear seat of front main body part shell and connecting base are mutually inserted and form hinged, cutting motor is as hinged pin shaft, the output shaft of cutting motor and the input end gear of cutting transmission mechanism in arm support are coaxial transmission connection, cutting motor is respectively fixed connection and rotary connection relative to front main body part shell and swing arm shell.The present application can provide larger mining range, larger cutting power, also can shorten body, improve the problem of coal cutter gravity center.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of coal winning machine cutting mechanism, especially applicable to thin coal seam coal winning machine, can provide larger mining range for thin coal seam coal winning machine. BACKGROUND

[0002] On the existing thin coal seam coal winning machine, cutting motor is usually located on rocker arm, and swings with rocker arm swing.When the rear rocker arm of the travel direction of this thin coal seam suspension body coal winning machine is equipped with cutter, the problem of small rear drum mining height will appear, because when mining height increases, rear rocker arm cutting motor will interfere with the upper coal table left by front drum cutting bottom cutter, therefore the overall mining height of this coal winning machine is too narrow, and it cannot adapt to the mining requirements of large thickness variation of thin coal seam working face.

[0003] In view of the above problems, the industry has proposed that the cutting part is a swing part and a fixed part, and the cutting motor and the main part of the cutting transmission system are arranged in the fixed part, which leads to the structure of the fixed part being too complex, the length of the left and right of the machine body suspension section being too long, the weight being too large, and the center of gravity of the whole machine still has a great influence on the stress of the whole machine. Moreover, the long machine body structure of the coal winning machine cannot perform the straight push-in cutter process similar to the shortwall coal winning machine, and the time of two-end oblique cutting is long, which has certain restriction on the mining efficiency. SUMMARY

[0004] The present application aims to provide a kind of thin coal seam short span coal winning machine cutting mechanism, which can provide larger mining range, larger cutting power, shorten the machine body and improve the center of gravity of the coal winning machine.

[0005] The main technical solutions of the present application are as follows:

[0006] The thin seam short span coal cutter cutting mechanism comprises a cutting motor, a swing arm shell and a front main body shell, the main body of the swing arm shell is a left and right extending arm support, a 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, a connecting arm is provided in the middle of the arm support and suspends from the arm support to the front, a front arm is provided on the connecting arm and suspends from the connecting arm to the left or the right, a front pin shaft mounting hole is provided on the front arm, a rear pin shaft mounting hole is provided on the front part of the high speed end of the arm support, the input end gear is installed on the rear part of the high speed end of the arm support, the front pin shaft mounting hole and the rear pin shaft mounting hole are coaxial with the input end gear, the right edge or the left edge of the front main body shell is sequentially provided with a first lug, a second lug and a connecting base from front to back, the first lug and the second lug form a front groove, the second lug and the connecting base form a rear groove, the front arm and the high speed end of the arm support are respectively inserted in the front groove and the rear groove, the cutting motor is installed in an inner hole formed by the lug hole of the first lug, the front pin shaft mounting hole, the lug hole of the second lug and the rear pin shaft mounting hole, the output shaft of the cutting motor is coaxially connected with the input end gear of the cutting transmission mechanism, the cutting motor is fixedly connected and rotatably connected with the front main body shell and the swing arm shell respectively.

[0007] The shell of the cutting motor can be rotatably supported in the front pin shaft mounting hole and the rear pin shaft mounting hole by bearings.

[0008] The shell of the cutting motor adopts a thick wall structure, the surface of the shell is sequentially and spacedly provided with a first circular convex stop, a second circular convex stop and a third circular convex stop from front to back, the rear part of the lug hole of the first lug, the front part of the lug hole of the second lug and the rear part of the lug hole of the second lug are respectively provided with a first circular concave stop, a second circular concave stop and a third circular concave stop, the first to third circular convex stops and the first to third circular concave stops are one-to-one corresponding and tightly fitted.

[0009] The connecting arm is provided with an inner cavity which is communicated with the inner cavity of the arm support, and a reinforced cooler is preferably arranged in the inner cavity of the connecting arm.

[0010] The middle part of the arm support is provided with a rear protruding bump structure, the inner cavity of the bump structure is an auxiliary cavity which is part of the inner cavity of the arm support.

[0011] The cutting transmission mechanism comprises an input end gear, a first idler gear set, an intermediate gear, a second idler gear set and an output end gear which are sequentially connected, a gear pump is further arranged in the inner cavity of the arm support, and the intermediate gear is coaxially fixedly connected with the gear pump.

[0012] The bearing preferably adopts a joint bearing, a wear-reducing layer is arranged between the inner ring and the outer ring of the joint bearing, one sealing seat is respectively arranged on the radially outer side of the inner ring and the front and rear ends of the outer ring, a sealing groove is arranged on the radially inner hole surface and the outer end surface of the sealing seat, and a sealing ring is arranged in the sealing groove.

[0013] The lower part of the connecting arm is also provided with left and right extending oil cylinder accommodating cavities with downward opening, which are located below the front arm in the front and back direction, and a large part of a height-adjusting oil cylinder is located in the oil cylinder accommodating cavities, one end of the height-adjusting oil cylinder is hinged to the connecting arm, and the other end is hinged to the front body part shell, and the two hinging axes extend horizontally in front and back directions.

[0014] The middle and upper part of the connecting arm is the narrowest in the left and right width in the height direction, and the left and right width becomes wider closer to the upper and lower ends, the top surface of the connecting arm is a slope, and preferably higher closer to the high speed end of the arm support in the left and right direction.

[0015] The thin seam short span coal mining machine cutting mechanism further comprises a clutch mechanism, the clutch mechanism comprises a mandrel and a clutch device, the clutch device is connected in front of the mandrel, the front part of the mandrel is provided with a front spline shaft section, the rear part of the mandrel is provided with a rear spline shaft section and a guide shaft section, the spline shaft section is located in front of the guide shaft section, the core part of the input end gear is provided with a gear spline hole and a guide hole in front and back directions, the front part of the output shaft of the cutting motor is provided with a motor spline hole, when the clutch device is located at the rear limit position, the front spline shaft section and the rear spline shaft section of the mandrel are respectively spline-coupled with the motor spline hole and the gear spline hole, and the front part of the guide shaft section is located in the guide hole, and a radial gap is left between the guide shaft section and the guide hole.

[0016] The present application has the following beneficial effects:

[0017] In the present application, the cutting motor is used as the pin shaft for hinging the swing arm shell and the front body part shell, which shortens the left and right length of the front body part shell, and equivalently shortens the left and right length of the coal mining machine suspension body section, and simplifies the structure of the cutting mechanism.

[0018] The front arm, as the main supporting force part, is separated from the arm support where the cutting transmission mechanism is installed, and the front part of the high speed end of the arm support is only a secondary force part for auxiliary support, so that the cutting transmission mechanism can be kept in a good non-force state, and the transmission precision is guaranteed.

[0019] The cutting transmission mechanism and the rear pin shaft mounting hole for auxiliary supporting the cutting motor are arranged in the arm support, which not only makes the structure more compact, but also makes the power input connection point of the cutting transmission mechanism and the auxiliary supporting point closer, so that the power transmission is less affected by the jumping and more stable and reliable.

[0020] The front and rear groups of stopper cooperation structures are located in front of and behind the front arm, which helps to balance the stress of the front arm, and the rear group of stopper cooperation structures provides auxiliary stress support for the high-speed end of the boom. The front and rear groups of stopper cooperation structures are used to balance the stress of the swing arm shell, which can improve the reliability of the swing arm shell with the cutting motor as a pin shaft and the hinge connection between the swing arm shell and the front body.

[0021] The cutting motor is supported on the swing arm shell by the joint bearing, which helps to maintain the concentricity between the front and rear pin shaft mounting holes and the shell of the cutting motor, and improves the transmission accuracy between the cutting motor and the cutting transmission mechanism. The wear-reducing layer is arranged between the inner ring and the outer ring of the joint bearing, which can reduce the wear of the sliding pair of the bearing, and the seals are arranged at both ends of the wear-reducing layer, which can ensure the cleanliness of the internal friction pair and maintain good lubrication conditions in the bearing. Accordingly, the transmission accuracy between the cutting motor and the cutting transmission mechanism is also improved.

[0022] The height-adjusting oil cylinder is arranged below the cutting motor, which not only makes full use of the space between the roof and the floor of the coal mining face, but also greatly shortens the length of the suspension body section in the left and right directions, and for a double-drum coal mining machine, the distance between the two drums is shortened. The arrangement of the oil cylinder accommodating cavity provides a relatively clean working space for the swing and wiring of the height-adjusting oil cylinder, ensures that the swing arm shell is not affected by coal and other mining materials during the swing process, and finally ensures that the maximum mining range is not affected.

[0023] The radial gap is reserved between the guide shaft section and the guide hole, which increases the floating amount of the power transmission structure and improves the adaptability of the power transmission structure.

[0024] The connecting arm is also provided with an inner cavity, which is in communication with the inner cavity of the boom, and increases the oil storage volume in the swing arm shell. Furthermore, a reinforced cooler is arranged in the inner cavity of the connecting arm for reinforcing the cooling of the oil cavity, so as to improve the cooling effect of the high-power-density swing arm.

[0025] Since part of the power is transmitted to the gear pump by the intermediate gear, the hydraulic system does not need to additionally arrange an independent power source.

[0026] The arrangement of the auxiliary cavity not only increases the oil cavity of the boom, but also increases the strength of the shell of the boom. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a front view of an embodiment of the present application;

[0028] Figure 2 It is a top view of an embodiment of the present application;

[0029] Figure 3 It is aFigure 1 Figure 1 is a front view of a swing arm housing and an assembly of a drum and a cutting transmission mechanism mounted thereon, according to the present application;

[0030] Figure 4 Figure 2 is a sectional view taken along line A-A of Figure 1; Figure 3 Figure 3 is a sectional view taken along line B-B of Figure 1;

[0031] Figure 5 Figure 4 is a schematic view of an embodiment of a cutting motor;

[0032] Figure 6 Figure 5 is a sectional view taken along line C-C of Figure 1; Figure 2 Figure 6 is a sectional view taken along line D-D of Figure 1;

[0033] Figure 7 Figure 7 is a schematic view of a double swing arm thin seam coal mining machine employing the cutting mechanism of the present application;

[0034] Figure 8 Figure 8 is a schematic view of the top structure of the double swing arm thin seam coal mining machine of Figure 7. Figure 7

[0035] Reference Signs:

[0036] 11. Swing arm housing; 111. Forearm; 1111. Outer surface of the overhanging end of the forearm; 112. Front portion of the high speed end of the boom; 113. Rear portion of the high speed end of the boom; 114. Connecting arm; 1141. Side near the high speed end of the boom; 1142. Side near the low speed end of the boom; 1144. Oil cylinder accommodating cavity; 1147. Top surface of the oil cylinder accommodating cavity; 115. Auxiliary cavity; 12. Cutting transmission mechanism; 121. Input end gear; 122. Planetary reduction mechanism; 123. Intermediate gear; 13. Drum; 14. Bearing; 15. Mandrel; 16. Reinforced cooler; 17. Gear pump;

[0037] 2. Front body portion housing; 211. First circular concave stop; 212. Second circular concave stop; 213. Third circular concave stop; 214. Front recess; 215. Larger diameter groove; 216. Smaller diameter groove; 217. Outer surface of the overhanging end of the first ear seat;

[0038] 3. Cutting motor; 31. First circular convex stop; 32. Second circular convex stop; 33. Third circular convex stop; 34. Annular end surface; 35. Front journal; 36. Rear journal;

[0039] 4. Height adjustment oil cylinder. DETAILED DESCRIPTION

[0040] A thin seam short span coal mining machine cutting mechanism (may be referred to as cutting mechanism for short) is disclosed, such as Figures 1-8 ​As shown, it comprises a cutting motor 3, a swing arm housing 11 and a front body housing 2. The main body of the swing arm housing is a left and right extending arm frame, and a cutting transmission mechanism 12 is installed in the arm frame. The cutting transmission mechanism adopts a fixed shaft gear transmission mechanism. In order to distinguish the two ends of the arm frame, the input end gear 121 (also the high speed end gear) and the output end gear (also the low speed end gear) of the cutting transmission mechanism are respectively regarded as the high speed end and the low speed end of the arm frame. A connecting arm 114 is provided in the middle of the arm frame, which is suspended from the arm frame to the front. A front arm 111 is provided on the connecting arm, which is suspended from the connecting arm to the left or right. For the right swing arm housing of the coal mining machine, the front arm is suspended to the left from the connecting arm. For the left swing arm housing of the coal mining machine, the front arm is suspended to the right from the connecting arm. A front pin shaft mounting hole is provided on the front arm, and a rear pin shaft mounting hole is provided on the front part 112 of the high speed end of the arm frame. The input end gear is installed on the rear part 113 of the high speed end of the arm frame. The front pin shaft mounting hole and the rear pin shaft mounting hole are coaxial with the input end gear. The front pin shaft mounting hole and the rear pin shaft mounting hole are used to install the cutting motor 3, and they are coaxial with the input end gear to ensure that the cutting motor is coaxial with the input end gear after installation to transmit power. The right edge or left edge of the front body housing is provided with a first ear seat, a second ear seat and a connecting base in sequence from front to back, which are extended to the left or right. The first ear seat and the second ear seat form a front groove 214, and the second ear seat and the connecting base form a rear groove. The front arm and the high speed end of the arm frame are respectively inserted into the front groove and the rear groove. The cutting motor is installed in an inner hole formed by the ear hole of the first ear seat, the front pin shaft mounting hole, the ear hole of the second ear seat and the rear pin shaft mounting hole. The output shaft of the cutting motor is coaxially connected with the input end gear 121 of the cutting transmission mechanism. The cutting motor is fixedly connected and rotatably connected with the front body housing and the swing arm housing respectively, so that the swing arm housing and the front body housing are hinged with the cutting motor as a pin shaft. By taking the cutting motor as a whole pin shaft, the left and right lengths of the front body housing are shortened, which is equivalent to shortening the left and right lengths of the suspended body section of the coal mining machine, and the structure of the cutting mechanism is simplified. The layout of the winding and the rotor and other related structures in the cutting motor can still adopt conventional structures.

[0041] The shell of the cutting motor is rotatably supported in the front pin shaft mounting hole and the rear pin shaft mounting hole by a bearing 14. Most of the load at the hinge is borne by the bearing, which can well protect the swing arm housing, the front body housing and the cutting motor from being affected or less affected, and maintain the connection reliability.

[0042] The outer shell of the cutting motor adopts a thick wall structure, and the outer shell surface is sequentially and spacedly provided with a first circular convex stop 31, a second circular convex stop 32 and a third circular convex stop 33 from front to back. The rear part of the ear hole of the first ear seat, the front part of the ear hole of the second ear seat and the rear part of the ear hole of the second ear seat are respectively provided with a first circular concave stop 211, a second circular concave stop 212 and a third circular concave stop 213, and the first to third circular convex stops and the first to third circular concave stops are in one-to-one corresponding close fit. The first and second circular convex stops and the first and second circular concave stops constitute a front group of stop fit structures, and the third circular convex stop and the third circular concave stop constitute a rear group of stop fit structures. The front group of stop fit structures is located in front of and behind the forearm, which helps to balance the stress of the forearm. The rear group of stop fit structures provides auxiliary stress support for the high-speed end of the arm support. The use of the front and rear groups of stop fit structures to balance the stress of the swing arm shell can improve the reliability of the hinged connection between the swing arm shell and the front main body part shell with the cutting motor as the pin shaft. The front journal 35 for installing the front bearing on the outer shell of the cutting motor is located between the first and second circular convex stops, and the rear journal 36 for installing the rear bearing is located behind the third circular convex stop. The annular end face 34 between the rear journal 36 and the third circular convex stop 33 participates in the end face sealing between the cutting motor and the arm support.

[0043] Further, the outer cylindrical surface of the first to third circular convex stops is provided with a sealing groove, and a sealing ring is arranged in the sealing groove.

[0044] The coal mining machine drum 13 and the planetary reduction mechanism 122 are both installed on the low-speed end of the arm support, and the planetary reduction mechanism is located in the core of the drum. The planetary reduction mechanism bears most of the reduction work, so the cutting transmission mechanism as the front-stage reduction part adopts a relatively simple fixed shaft gear transmission mechanism to meet the reduction requirement, and correspondingly the outer shape of the arm support for accommodating the cutting transmission mechanism is more regular.

[0045] The external load force received by the drum is transmitted to the front main body part shell through the front part of the connecting arm, the forearm and the high-speed end of the arm support. Among them, the forearm as the main supporting force part is separated from the arm support on which the cutting transmission mechanism is installed, and the front part of the high-speed end of the arm support, although it is part of the arm support, only serves as a secondary force part for auxiliary support, so it can basically ensure that the cutting transmission mechanism is in a good non-stressed state, and the transmission precision is guaranteed.

[0046] The cutting transmission mechanism and the rear pin shaft mounting hole for auxiliary supporting the cutting motor are both arranged in the arm support, which not only makes the structure more compact, but also makes the power input connection point of the cutting transmission mechanism and the auxiliary supporting point closer, so that the power transmission is less affected by the jumping and more stable and reliable.

[0047] The connecting arm is provided with an inner cavity, which communicates with the inner cavity of the arm frame. The inner cavity of the connecting arm increases the oil storage volume in the swing arm housing. The inner cavity of the connecting arm is provided with a reinforced cooler 16 for reinforcing the cooling of the oil cavity to improve the cooling effect of the high-power swing arm.

[0048] The middle part of the arm frame is provided with a rear protruding bump structure. The inner cavity of the bump structure is an auxiliary cavity 115, which is part of the inner cavity of the arm frame. The auxiliary cavity not only increases the oil cavity of the arm frame, but also increases the strength of the housing of the arm frame.

[0049] The cutting transmission mechanism comprises an input gear 121, a first idler gear set, an intermediate gear 123, a second idler gear set and an output gear connected in sequence. The idler gears in the first idler gear set and the second idler gear set can each have one or more. The first stage reduction is achieved from the input gear to the intermediate gear, and the second stage reduction is achieved from the intermediate gear to the output gear. The inner cavity of the arm frame is also provided with a gear pump 17. The intermediate gear is coaxially fixedly connected with the gear pump. The gear pump is the power source of the hydraulic system. Since the intermediate gear transmits part of the power to the gear pump, the hydraulic system does not need to additionally provide an independent power source.

[0050] The bearing adopts a spherical plain bearing, which has large load capacity, impact resistance, corrosion resistance, wear resistance and self-aligning. The use of the spherical plain bearing helps to maintain the concentricity between the front and rear pin shaft mounting holes and the shell of the cutting motor.

[0051] A wear-reducing layer is further arranged between the inner ring and the outer ring of the spherical plain bearing to reduce the wear of the sliding pair of the bearing. A sealing seat is arranged on the radially outer side of the inner ring and the front and rear ends of the outer ring, respectively. A sealing groove is arranged on the radially inner hole surface and the outer end surface of the sealing seat, and a sealing ring is arranged in the sealing groove. The use of the 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 transmission mechanism.

[0052] The lower part of the connecting arm is provided with an oil cylinder accommodating cavity 1144 extending left and right and opening downward. The oil cylinder accommodating cavity is located below the front arm in the front-rear direction. A large part of a height-adjusting oil cylinder 4 is located in the oil cylinder accommodating cavity. One end of the height-adjusting oil cylinder is hingedly connected to the connecting arm, and the other end is hingedly connected to the front body part housing. The two hinging axes extend horizontally in the front-rear direction. The extension and contraction of the height-adjusting oil cylinder can drive the swing arm housing to swing up and down around the front body part housing.

[0053] The front-rear width of the oil cylinder accommodating cavity is slightly wider than the diameter of the cylinder barrel of the height-adjusting oil cylinder. The middle top surface 1147 of the oil cylinder accommodating cavity is an inner concave circular arc cylindrical surface extending left and right with a straight generatrix. The space above the cylinder barrel of the height-adjusting oil cylinder and below the middle top surface 1147 of the oil cylinder accommodating cavity is relatively closed, which can be used for the layout of the pipelines of the oil cylinder.

[0054] The middle top surface of the oil cylinder accommodating cavity and the cylinder barrel of the height-adjusting oil cylinder can be embedded with an elastic body made of high-elasticity sponge or the like. The top surface and bottom surface of the elastic body are respectively attached to the middle top surface of the oil cylinder accommodating cavity and the surface of the cylinder barrel of the height-adjusting oil cylinder, so that the elastic body fills the space above the oil cylinder and below the middle top surface of the oil cylinder accommodating cavity, and the coal powder is prevented from entering the oil cylinder accommodating cavity from above the oil cylinder.

[0055] Further, the end top surface of the oil cylinder accommodating cavity near the low-speed end of the boom is an inner concave circular-arc cylindrical surface extending forward and backward along a straight generatrix, and the end top surface covers the articulation lug of the height-adjusting oil cylinder near the low-speed end of the boom and is nearly attached to the outer surface of the articulation lug, thereby playing a role in closing the outer end of the oil cylinder accommodating cavity to some extent and preventing the coal powder from entering the oil cylinder accommodating cavity from the outer end of the oil cylinder accommodating cavity. In combination with the arrangement of the elastic body described above, the space above the cylinder barrel of the oil cylinder accommodating cavity is relatively closed, which can effectively prevent the coal powder from entering and ensure that the oil cylinder accommodating cavity remains relatively clean.

[0056] The oil cylinder accommodating cavity provides a relatively clean working space for the height-adjusting oil cylinder, ensures that the swing arm shell is not affected by the coal and other mining materials during the swing process, and ultimately ensures that the maximum mining range is not affected.

[0057] The front and rear cavity walls of the oil cylinder accommodating cavity near the low-speed end of the boom are provided with oil cylinder outer pin holes, and the right end or left end of the lower part of the front main body shell is provided with an oil cylinder inner pin hole, and the articulation shafts of the height-adjusting oil cylinder and the connecting arm and the front main body shell are respectively installed in the oil cylinder outer pin holes and the oil cylinder inner pin hole. The front and rear widths of the oil cylinder accommodating cavity are slightly wider than the diameter of the cylinder barrel of the height-adjusting oil cylinder. The space above the cylinder barrel of the height-adjusting oil cylinder and below the top surface 1147 of the oil cylinder accommodating cavity is relatively closed, which can be used for the layout of the pipeline of the oil cylinder.

[0058] The middle upper part of the connecting arm in the height direction is the narrowest in left and right width, and the closer to the upper and lower ends, the wider in left and right width, especially the lower part, which is used for arranging the oil cylinder accommodating cavity. The entire connecting arm forms a flat and thin structure. The left and right width of the narrowest part is preferably the same as the height of the front pin shaft mounting hole. The top surface of the connecting arm is a slope, and the closer to the high-speed end of the boom, the higher in left and right direction. The flat and thin structure and the special slope structure of the connecting arm make the swing arm shell swing up and down without affecting the coal table above, so that a large mining range can be ensured.

[0059] The thin seam short span mining machine cutting mechanism further comprises a clutch mechanism, the clutch mechanism comprising a mandrel 15 and a clutch device connected in front of the mandrel. The front part of the mandrel is provided with a front spline shaft section, the rear part of the mandrel is provided with a rear spline shaft section and a guide shaft section, and the spline shaft section is in front of the guide shaft section. The core of the input gear is provided with a gear spline hole and a guide hole at intervals. The front part of the output shaft of the cutting motor is provided with a motor spline hole. When the clutch mechanism is in the rear limit position (i.e. the "engaged" position), the front spline shaft section and the rear spline shaft section of the mandrel are respectively spline-coupled with the motor spline hole and the gear spline hole, and the front part of the guide shaft section is located in the guide hole, leaving a radial gap between the guide shaft section and the guide hole. When the clutch device is pulled forward, the rear spline shaft section of the mandrel is disengaged from the gear spline hole, the rear part of the guide shaft section is located in the guide hole, and the front spline shaft section of the mandrel is partially disengaged from the motor spline hole. The radial gap between the guide shaft section and the guide hole increases the floating amount of the power transmission structure, which can improve the adaptability of the power transmission structure.

[0060] The overhanging end outer surface 1111 of the forearm and the high-speed end outer surface of the arm support are provided as a first set of convex circular arc cylindrical surfaces coaxial with the front pin shaft mounting hole, the front groove and the rear groove are provided as a first set of concave circular arc cylindrical surfaces coaxial with the front pin shaft mounting hole, and the first set of concave circular arc cylindrical surfaces are coaxial with the first set of convex circular arc cylindrical surfaces and have a spacing therebetween; the side surface 1141 of the connecting arm near the high-speed end of the arm support is provided as a second set of concave circular arc cylindrical surfaces coaxial with the front pin shaft mounting hole, the overhanging end outer surface 217 of the first ear seat and the overhanging end outer surface of the second ear seat are provided as a second set of convex circular arc cylindrical surfaces coaxial with the front pin shaft mounting hole, and the second set of convex circular arc cylindrical surfaces are coaxial with the second set of concave circular arc cylindrical surfaces and have a spacing therebetween. By controlling the size of the corresponding spacing within a suitable range, the accumulation of coal and rock into the swing arm housing and the front main body housing during the swinging of the swing arm housing relative to the front main body housing can be effectively controlled.

[0061] The rear groove is a stepped groove, wherein a larger diameter groove 215 is used to accommodate the front part of the high-speed end of the arm support, and a smaller diameter groove 216 is used to accommodate the rear part of the high-speed end of the arm support. Correspondingly, the high-speed end outer surface of the arm support is also provided in a stepped shape.

[0062] The side surface 1142 of the connecting arm near the low-speed end of the arm support in the left-right direction is provided as a concave circular arc cylindrical surface, and further preferably as a concave circular arc cylindrical surface coaxial with the output gear. This concave circular arc cylindrical surface can maintain a certain equidistant gap with the drum blade, improving the loading effect of the drum screw conveyor.

[0063] Unless specifically specified, the front and back directions herein refer to the directions close to the coal wall and away from the coal wall, respectively.

Claims

1. A cutting mechanism for a thin coal seam short-span coal mining machine, characterized in that: The system includes a cutting motor, a swing arm housing, and a front main body housing. 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 extending forward from the middle of the boom is provided. A forearm extending to the left or right from the connecting arm is provided on the connecting arm. The forearm has a front pin mounting hole. A rear pin mounting hole is provided at the front of the high-speed end of the boom. The wheel is installed at the rear of the high-speed end of the boom. Both the front and rear pin mounting holes are coaxial with the input gear. The right or left edge of the front main body housing is provided with a first lug, a second lug, and a connecting base sequentially from front to back. A front groove is formed between the first and second lugs, and a rear groove is formed between the second lug and the connecting base. The forearm and the high-speed end of the boom are respectively inserted into the front and rear grooves. The cutting motor is installed in the lug holes of the first lug, the front pin mounting hole, and the second lug. In the inner hole formed by the combination of the rear pin mounting hole and the cutting motor output shaft is coaxially connected to the input gear of the cutting transmission mechanism. The outer shell of the cutting motor adopts a thick-walled structure. The outer shell surface is provided with a first circular convex stop, a second circular convex stop, and a third circular convex stop in sequence from front to back. The rear part of the ear hole of the first ear seat, the front part of the ear hole of the second ear seat, and the rear part of the ear hole of the second ear seat are respectively provided with a first circular concave stop, a second circular concave stop, and a third circular concave stop. The first to third circular convex stops and the first to third circular concave stops are tightly fitted one to one. The outer shell of the cutting motor is rotatably supported in the front pin mounting hole and the rear pin mounting hole by bearings. The cutting motor is fixedly connected and rotatably connected to the front main body shell and the swing arm shell, respectively. The front journal for mounting the front bearing on the outer shell of the cutting motor is located between the first and second circular convex stops, and the rear journal for mounting the rear bearing is located behind the third circular convex stop. The rear journal and the third circular convex stop are annular end faces.

2. The cutting mechanism of the thin coal seam short span coal mining machine as described in claim 1, characterized in that: The connecting arm has an inner cavity that communicates with the inner cavity of the boom, and an enhanced cooler is provided in the inner cavity of the connecting arm.

3. The cutting mechanism for a thin coal seam short-span coal mining machine as described in claim 2, characterized in that: The boom has a rearward protruding ridge structure in the middle, and the cavity inside the ridge structure is an auxiliary cavity, which is part of the inner cavity of the boom.

4. The cutting mechanism for a thin coal seam short-span coal mining machine as described in claim 3, characterized in that: The cutting transmission mechanism includes an input gear, a first idler gear set, an intermediate gear, a second idler gear set, and an output gear connected in sequence. A gear pump is also provided in the inner cavity of the boom, and the intermediate gear is coaxially and fixedly connected to the gear pump.

5. The cutting mechanism for a thin coal seam short-span coal mining machine as described in claim 1, 2, 3, or 4, characterized in that: The bearing is a spherical plain bearing. A friction-reducing layer is provided between the inner ring and the outer ring of the spherical plain bearing. A sealing seat is provided on the radial outer side of the inner ring and at both the front and rear ends of the outer ring. A sealing groove is provided on the radial inner hole surface and the outer end face of the sealing seat, and a sealing ring is installed in the sealing groove.

6. The cutting mechanism for a thin coal seam short-span coal mining machine as described in claim 1, 2, 3 or 4, characterized in that: The lower part of the connecting arm is provided with a cylinder receiving cavity that extends left and right and opens downward. In the front-back direction, the cylinder receiving cavity is located below the forearm. Most of the height adjustment cylinder is located in the cylinder receiving cavity. One end of the height adjustment cylinder is hinged to the connecting arm, and the other end is hinged to the front main body housing. The hinge axes of these two points extend horizontally front and back. An elastic body is embedded between the top surface of the middle part of the cylinder receiving cavity and the cylinder barrel of the height adjustment cylinder. The top surface and bottom surface of the elastic body are respectively in contact with the top surface of the middle part of the cylinder receiving cavity and the cylinder barrel surface of the height adjustment cylinder.

7. The cutting mechanism for a thin coal seam short-span coal mining machine as described in claim 6, characterized in that: The connecting arm extends downward beyond the bottom surface of the middle part of the boom. In the height direction, the width of the connecting arm is narrowest in the upper middle part and widens as it approaches the upper and lower ends. The top surface of the connecting arm is sloping, and the end closer to the high-speed end of the boom is higher in the left and right direction.

8. The cutting mechanism for a thin coal seam short-span coal mining machine as described in claim 6, characterized in that: It also includes a clutch mechanism, which includes a spindle and a clutch device. The clutch device is connected to the front of the spindle. The front part of the spindle is provided with a front spline shaft section, and the rear part of the spindle is provided with a rear spline shaft section and a guide shaft section. The spline shaft section is located in front of the guide shaft section. The core of the input end gear is provided with a gear spline hole and a guide hole at intervals. The front part of the output shaft of the cutting motor is provided with a motor spline hole. When the clutch device is in the rear limit position, the front spline shaft section and the rear spline shaft section of the spindle are splinedly connected to the motor spline hole and the gear spline hole, respectively. The front part of the guide shaft section is located in the guide hole, and a radial clearance is left between the guide shaft section and the guide hole.

9. The cutting mechanism for a thin coal seam short-span coal mining machine as described in claim 5, characterized in that: The lower part of the connecting arm is provided with a cylinder receiving cavity that extends left and right and opens downward. In the front-back direction, the cylinder receiving cavity is located below the forearm. Most of the height adjustment cylinder is located in the cylinder receiving cavity. One end of the height adjustment cylinder is hinged to the connecting arm, and the other end is hinged to the front main body housing. The hinge axes of these two points extend horizontally front and back. An elastic body is embedded between the top surface of the middle part of the cylinder receiving cavity and the cylinder barrel of the height adjustment cylinder. The top surface and bottom surface of the elastic body are respectively in contact with the top surface of the middle part of the cylinder receiving cavity and the cylinder barrel surface of the height adjustment cylinder.

10. The cutting mechanism for a thin coal seam short-span coal mining machine as described in claim 9, characterized in that: The connecting arm extends downward beyond the bottom surface of the middle part of the boom. In the height direction, the width of the connecting arm is narrowest in the upper middle part and widens as it approaches the upper and lower ends. The top surface of the connecting arm is sloping, and the end closer to the high-speed end of the boom is higher in the left and right direction.

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