Thin seam compact coal cutter

Abstract

The invention relates to a thin seam compact coal mining machine, which comprises a machine body and two swing arm housings respectively hinged at the left and right ends of the machine body, the left and right extending arm frames of the swing arm housings are respectively high speed end and low speed end, the middle part of the arm frame is provided with a connecting arm which is suspended forward from the arm frame, the front and rear of the arm frame are respectively provided with a front arm and a rear arm, the root of the front arm is connected to the connecting arm, the front and rear arms are respectively hinged on the machine body, the input end gear of the rear stage cutting transmission mechanism installed in the arm frame is coaxially transmission connected with the output end gear of the front stage cutting transmission mechanism installed in the machine body, the lower part of the connecting arm is provided with an oil cylinder outer containing cavity, the lower part of the machine body is provided with an oil cylinder inner containing cavity, a height adjusting oil cylinder is located in the oil cylinder outer containing cavity and the oil cylinder inner containing cavity, the two ends of the height adjusting oil cylinder are respectively hinged on the connecting arm and the machine body. The invention can provide a larger mining range, has a more compact machine body, and can improve the problem of the center of gravity of the coal mining machine.

Description

TECHNICAL FIELD

[0001] The present application relates to a coal mining machine, in particular a thin seam compact coal mining machine, which has a large mining range, a short machine body and better overall stress stability. BACKGROUND

[0002] On the existing thin seam coal mining machine, the cutting motor is usually located on the swing arm and swings with the swing arm. When the rear swing arm of the thin seam suspended machine body coal mining machine cuts the upper cutter in the direction of travel, the problem of too small rear drum mining height occurs. The reason is that when the mining height is increased, the rear swing arm cutting motor will interfere with the upper coal table left after the front drum cutting bottom cutter, so the overall mining height of this coal mining machine is too narrow and cannot adapt to the mining requirements of the large thickness change of the thin 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 a too complex structure of the fixed part, a too long length and a too large weight of the machine body suspension section, 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 mining machine cannot perform the straight pushing cutter process similar to the short wall coal mining machine, and the time for cutting the cutter at both ends is long, which has certain restriction on the mining efficiency. SUMMARY

[0004] The present application aims to provide a thin seam compact coal mining machine, which can provide a larger mining range, has a more compact machine body, and can improve the center of gravity problem of the coal mining machine.

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

[0006] A compact coal mining machine for thin coal seams includes a body, two swing arm housings (left and right), and two height-adjusting cylinders (left and right). The front of the body has a first lug, a second lug, and a third lug arranged sequentially from front to back on both its left and right edges. A front groove is formed between the first and second lugs, a middle groove is formed between the second and third lugs, and a rear groove is formed between the third lug and the rear of the body. A cutting motor and a front-stage cutting transmission mechanism are installed in the front cavity of the body. The front-stage cutting transmission mechanism includes two sets of fixed-axis gear transmission mechanisms (left and right). The structure includes an input gear, an idler gear set, and an output gear that extend left and right and are connected in sequence. The left and right fixed-axis gear transmission mechanisms share a single input gear, which is coaxially connected to the output shaft of the cutting motor. The two output gears are located in the front chambers of the left and right third lugs, respectively. The main body of the swing arm housing is a left-right extending boom, within which a rear-stage cutting transmission mechanism is installed. The input and output gears of the rear-stage cutting transmission mechanism serve as the high-speed and low-speed ends of the boom, respectively. The boom has a connecting arm extending forward from the boom in the middle. A forearm extends to the left or right from the connecting arm. A rear arm is located behind the high-speed end of the boom, and the rear arm is a cantilever structure connected to the boom at one end. The forearm and rear arm have front and rear hinge connection holes, respectively. The forearm, the high-speed end of the boom, and the rear arm are inserted into the front, middle, and rear grooves, respectively. The forearm is hinged to the first and second lugs, and the rear arm is hinged to the third lug and the rear of the machine body. The output gear of the front-stage cutting transmission mechanism and the output gear of the rear-stage cutting transmission mechanism... The input gear is coaxially connected and coaxial with the front hinge connection hole on the same side on both sides; the lower part of the machine body is provided with a cylinder inner receiving cavity that extends to the left and right and opens downward; the lower part of the connecting arm of the left and right swing arms is provided with a cylinder outer receiving cavity that extends to the left and right and opens downward; the two cylinder outer receiving cavities and the cylinder inner receiving cavity are combined to form two cylinder receiving cavities on the left and right; the two height adjustment cylinders are respectively located in the two cylinder receiving cavities on the left and right; one end of the height adjustment cylinder is hinged to the connecting arm and the other end is hinged to the machine body; the hinge axis extends back and forth.

[0007] The connecting arm is narrowest in the upper middle part, and becomes wider in the left and right as it approaches the upper and lower ends. The top surface of the connecting arm is a slope, and the top surface of the connecting arm is higher in the left and right direction as it approaches the high-speed end of the boom on the same side.

[0008] 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.

[0009] The side of the connecting arm near the low-speed end of the boom in the left-right direction is configured as a concave arc cylindrical surface coaxial with the output gear of the subsequent cutting transmission mechanism.

[0010] The overhanging end outer surface of the front arm, the high-speed end outer surface of the arm frame and the overhanging end outer surface of the rear arm on the same swing arm shell are provided as a first group of convex circular cylindrical surfaces coaxial with the front hinge connecting hole, and the corresponding front groove, middle groove and rear groove are provided as a first group of concave circular cylindrical surfaces coaxial with the front hinge connecting hole, the first group of concave circular cylindrical surfaces correspond to the first group of convex circular cylindrical surfaces and are spaced from each other; the overhanging end outer surfaces of the first ear seat and the second ear seat on the same side are provided as a second group of convex circular cylindrical surfaces coaxial with the front hinge connecting hole, and the side surface of the connecting arm close to the high-speed end of the arm frame is provided as a second group of concave circular cylindrical surfaces coaxial with the front hinge connecting hole, the second group of convex circular cylindrical surfaces are coaxial with the second group of concave circular cylindrical surfaces and are spaced from each other.

[0011] The input end gear core of the rear stage cutting transmission mechanism is provided with a rear stage spline hole, a spline sleeve with an inner spline and an outer spline is installed in the rear stage spline hole, and the spline hole of the spline sleeve and the spline hole of the output end gear core of the front stage cutting transmission mechanism are simultaneously spline-coupled with a spline shaft.

[0012] A front wear sleeve is respectively installed in the ear hole of the first ear seat and the ear hole of the front part of the second ear seat, a rear wear sleeve is respectively installed in the ear hole of the third ear seat and the ear hole provided on the front section of the rear part of the machine body, a sliding bearing is installed in each of the front and rear hinge connecting holes, the front and rear sliding bearings are respectively sleeved and installed in the middle part of the front pin shaft sleeve and the rear pin shaft sleeve, the front part and the rear part of the front pin shaft sleeve are tightly matched with the front wear sleeve, the front part and the rear part of the rear pin shaft sleeve are tightly matched with the rear wear sleeve, the inner hole of the front pin shaft sleeve is communicated with the inner hole of the second ear seat, a limiting rod is installed in the two inner holes, the rear end of the limiting rod extends into the rear stage spline hole to axially limit the front end of the spline shaft, the front part of the limiting rod is fixed relative to the front pin shaft sleeve, and the remaining part of the limiting rod does not contact the inner hole of the front pin shaft sleeve, the inner hole of the second ear seat and the rear stage spline sleeve.

[0013] The machine body includes a front main body shell and a rear main body shell which are butted and fixed, the left and right edges of the front main body shell are each provided with the first ear seat, the second ear seat and the front connecting base in sequence from front to back, the middle groove is formed between the second ear seat and the front connecting base, the rear main body shell includes a rear base and a rear connecting base which is suspended forward from the middle part of the rear base to the left and right, the rear connecting base and the rear base form the rear groove, the cutting motor and the front stage cutting transmission mechanism are installed in the front main body shell, the left and right two output end gears of the front stage cutting transmission mechanism are respectively located in the left and right two front connecting bases, the rear arm is hinged with the rear connecting base and the rear base, the front connecting base and the rear connecting base are butted and fixed to form the third ear seat, and the left and right two swing arm shells are respectively located on the front side of the left part and the right part of the rear base.

[0014] The front main body part shell is a multi-cavity thin-wall frame structure, and the rear main body part shell is a solid structure.

[0015] The lower surface of the rear main body part shell is provided with one loading cavity on the left and one loading cavity on the right, and the loading cavity is a groove extending from front to back with a notch facing down.

[0016] The thin seam compact mining machine further comprises two left and right guide supporting shoes, and the two left and right supporting shoes are respectively supported behind the low-speed end of the left and right two arm supports.

[0017] The beneficial effects of the present application are:

[0018] The front-stage cutting transmission mechanism and the spline shaft, the spline shaft and the spline sleeve, and the spline sleeve and the rear-stage cutting transmission mechanism are all spline-coupled, and the spline-coupled structure with side clearance at multiple positions can significantly increase the radial floating amount, and since the related parts forming the spline-coupled structure can automatically center, even if the coaxiality of the front and rear two articulation points between the swing arm shell and the machine body is reduced due to wear, the influence on the power transmission between the front and rear cutting transmission mechanisms is also relatively small, and therefore the power transmission reliability is improved.

[0019] The front and rear two articulation connection points are separately arranged in front of and behind the power transmission connection point between the front and rear cutting transmission mechanisms, and the radial displacement of the two articulation connection points due to wear has less influence on the power transmission connection point located therebetween, and therefore the influence on the transmission accuracy can be reduced.

[0020] The overhanging end outer surface of the front arm, the high-speed end outer surface of the arm support, and the overhanging end outer surface of the rear arm are all left with a gap of equal thickness between the groove bottoms of the front groove, the middle groove, and the rear groove, and between the overhanging end outer surfaces of the first and second ear seats and the connecting arm, and as long as the size of the gap is controlled within a suitable range, the accumulation of coal and rock into the swing arm shell and the front and rear main body shells during the up-and-down swinging of the swing arm shell can be effectively controlled, and the smooth swinging can be ensured.

[0021] By arranging a reinforced cooler in the inner cavity of the connecting arm, the cooling effect of the high-power density swing arm is improved.

[0022] The two hinged positions are close to the left side or the right side of the cutting motor, and no other structure is arranged between the two hinged positions, so that the left and right lengths of the machine body, especially the suspended machine body section, are obviously shortened, and the connection reliability of the swing arm and the machine body is improved. When the drum top cutter cuts, only the arm part on the inner side of the drum changes the up-down position with the swing arm, and in combination with the above-mentioned thin structure and the special inclined surface structure of the connecting arm, the swing arm shell basically does not affect the upper coal table when swinging up and down, so that a large mining range can be ensured.

[0023] In addition, the height-adjusting oil cylinder is arranged below the cutting motor, the space occupation in the left-right direction is further reduced, and the compact short machine body structure of the coal mining machine is ensured. Due to the shortened left and right lengths of the suspended machine body section, the gravity center of the whole machine can be offset to the rear, and the stress stability of the whole machine is improved. In addition, the machine body is shortened, and the coal mining machine can conveniently perform a straight pushing cutter process similar to a short-wall coal mining machine, so that the mining efficiency is improved.

[0024] The front main body part shell is a multi-chamber thin-wall frame structure, and the rear main body part shell is a solid structure, so that the gravity center of the machine body is further moved to the rear, and the stability of the whole coal mining machine is improved.

[0025] The semi-closed oil cylinder accommodating cavity arranged at the lower part of the connecting arm and the front main body part shell can provide sufficient space for the swing of the height-adjusting oil cylinder and the accommodation of certain coal and the arrangement of pipelines.

[0026] The dust isolation structure arranged at both ends of the joint bearing can ensure the cleanliness of the internal friction pair. The wear-reducing layer arranged between the inner ring and the outer ring of the joint bearing can reduce the wear of the sliding pair of the bearing.

[0027] The loading cavity is arranged, so that a coal flow channel is added, and the coal loading effect is improved.

[0028] The support sliding shoe is arranged to separate the coal flow on the left and right sides of the center line of the drum, so that the coal flow on the outside does not hinder the coal flow on the inside when the coal mining machine moves, the coal and rock on the inside of the drum can smoothly pass through the loading cavity to the conveyor and are not blocked by the coal flow on the outside of the drum, so that the coal loading effect of the coal flow on the inside of the drum can be ensured, and the overall coal loading effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a working state schematic view when an embodiment of the present application walks to the left and cuts coal;

[0030] Figure 2 It is a top view structural schematic view of an embodiment of the present application;

[0031] Figure 3 It is a left view of an embodiment of the present application;

[0032] Figure 4 Fig. 1 is a schematic view of the structure of the main body of the coal mining machine according to the present application as viewed from the front;

[0033] Figure 5 Fig. 2 is a schematic view of the structure of the main body of the coal mining machine according to the present application as viewed from the top;

[0034] Figure 6 Fig. 3 is a schematic view of the structure of the main body of the coal mining machine according to the present application as viewed from the bottom;

[0035] Figure 7 Fig. 4 is a schematic view of the structure of the arm support according to the present application as viewed from the front; Figure 2 Fig. 5 is a schematic view of the structure of the arm support according to the present application as viewed from the top;

[0036] Figure 8 Fig. 6 is a schematic view of the structure of the front main body portion according to the present application as viewed from the front; Figure 2 Fig. 7 is a schematic view of the structure of the front main body portion according to the present application as viewed from the top;

[0037] Figure 9 Fig. 8 is a schematic view of the structure of the rear main body portion according to the present application as viewed from the front; Figure 2 Fig. 9 is a schematic view of the structure of the rear main body portion according to the present application as viewed from the top.

[0038] Reference Signs:

[0039] 1. swing arm; 11. swing arm housing; 111. front arm; 1111. outer surface of the overhanging end of the front arm; 112. rear arm; 1121. outer surface of the overhanging end of the rear arm; 113. high speed end of the arm support; 1131. outer surface of the high speed end of the arm support; 114. connecting arm; 1141. side surface near the high speed end of the arm support; 1144. outer accommodation cavity of the oil cylinder; 115. protruding structure; 12. rear stage cutting transmission mechanism; 121. input gear; 122. planetary reduction mechanism; 123. spline shaft; 124. spline sleeve; 13. drum; 14. slide bearing;

[0040] 2. front main body portion; 21. front main body portion housing; 211. first ear seat; 212. second ear seat; 213. front connecting base; 214. front groove; 215. middle groove; 216. inner accommodation cavity of the oil cylinder; 22. cutting motor; 23. clutch mechanism; 24. input gear; 25. output gear; 29. positioning pin;

[0041] 3. rear main body portion; 31. rear main body portion housing; 311. rear connecting base; 312. rear groove; 313. loading cavity;

[0042] 41. front pin shaft sleeve; 42. rear pin shaft sleeve;

[0043] 5. height adjustment oil cylinder;

[0044] 6. support shoe;

[0045] 9. conveyor; 91. blade; 95. conveying groove. DETAILED DESCRIPTION

[0046] The application discloses a thin seam compact coal mining machine (which can be referred to as a coal mining machine for short), as shown in the drawings, comprising a machine body, a swing arm shell 11 of left and right two swing arms 1 and left and right two height adjustment oil cylinders 5. Figures 1-9 The left and right edges of the front part of the machine body are each provided with a first ear seat 211, a second ear seat 212 and a third ear seat in sequence from front to back, a front groove 214 is formed between the first ear seat and the second ear seat, a middle groove 215 is formed between the second ear seat and the third ear seat, and a rear groove 312 is formed between the third ear seat and the rear part of the machine body. A cutting motor 22 and a front-stage cutting transmission mechanism are installed in the front cavity of the machine body. The front-stage cutting transmission mechanism comprises left and right two sets of fixed shaft gear transmission mechanisms, the fixed shaft gear transmission mechanism comprises an input end gear 24, an idler gear set and an output end gear 25 which are arranged in sequence and extend left and right, the left and right two sets of fixed shaft gear transmission mechanisms share one input end gear, the input end gear is coaxially connected with the output shaft of the cutting motor, and in the embodiment shown in the drawings, the two are coaxially connected through a clutch mechanism 23. The left and right two output end gears are respectively located in the front cavity of the left and right two third ear seats.

[0047] The main body of the swing arm shell is an arm support which extends left and right, and a rear-stage cutting transmission mechanism 12 is installed in the arm support. In order to conveniently distinguish between the two ends of the arm support, the end where the input end gear and the output end gear of the rear-stage cutting transmission mechanism are located is respectively taken as the high-speed end and the low-speed end of the arm support. A planetary reduction mechanism 122 is installed on the front side of the low-speed end of the arm support, and a drum 13 is sleeved on the planetary reduction mechanism and is fixedly connected with the planetary carrier of the planetary reduction mechanism in a coaxial manner. A connecting arm 114 which is suspended from the arm support towards the front is arranged in the middle of the arm support, a front arm 111 which is suspended from the connecting arm towards the left or the right is arranged on the connecting arm, that is, for the right swing arm shell of the coal mining machine, the front arm is suspended from the connecting arm towards the left, and for the left swing arm shell of the coal mining machine, the front arm is suspended from the connecting arm towards the right. A rear arm 112 which is a cantilever structure with one end connected to the arm support is arranged behind the high-speed end 113 of the arm support.

[0048] The front arm and the rear arm are respectively provided with front and rear hinged connection holes. The front arm, the high-speed end of the arm support and the rear arm are respectively inserted into the front groove, the middle groove and the rear groove, wherein the front arm is hinged with the first ear seat and the second ear seat, and the rear arm is hinged with the third ear seat and the rear part of the machine body. The output end gear 25 of the front-stage cutting transmission mechanism and the input end gear 121 of the rear-stage cutting transmission mechanism are coaxially connected, and the two are coaxial with the front hinged connection hole on the same side, so as to ensure that the power transmission from the front-stage cutting transmission mechanism to the rear-stage cutting transmission mechanism and the upward and downward swinging of the swing arm relative to the machine body can be simultaneously performed without interference. Sealing rings are installed on the front and rear end faces of the front arm, the high-speed end of the arm support and the rear arm respectively, so as to realize end face sealing at the relative swinging joint surface between the swing arm shell and the machine body.

[0049] The two hinges are close to the left or right side of the cutting motor, and no other structure is arranged between the two hinges, so the length of the left and right sides of the machine body, especially the suspended machine body, is obviously shortened, and the connection reliability of the swing arm and the machine body is improved. When the drum top cutter cuts, only the inner side of the drum connected with the arm part swings up and down with the swing arm.

[0050] In addition, the length of the left and right sides of the suspended machine body is shortened, so that the gravity center of the whole machine is offset to the rear, and the stress stability of the whole machine is improved. Moreover, the machine body is shortened, so that the shearer can conveniently perform the straight advancing cutter process similar to the shortwall shearer, thereby improving the mining efficiency.

[0051] The lower part of the machine body is provided with an oil cylinder inner accommodating cavity 216 extending leftward and rightward and opening downward, and the lower part of the connecting arm of the left and right two swing arms is provided with an oil cylinder outer accommodating cavity 1144 extending leftward and rightward and opening downward, and the left and right two oil cylinder outer accommodating cavities are sealed at one end in the left and right directions and are opposite to the oil cylinder inner accommodating cavity at the other end. The left and right two oil cylinder outer accommodating cavities and the oil cylinder inner accommodating cavity are combined into left and right two oil cylinder accommodating cavities, and the left and right two height-adjusting oil cylinders are respectively located in the left and right two oil cylinder accommodating cavities, one end of the height-adjusting oil cylinder is hinged to the connecting arm, the other end is hinged to the machine body, and the hinge axes all extend forward and backward. The oil cylinder outer accommodating cavity in the front and rear direction is located at the position of the middle part of the connecting arm and offset to the front end. The extension and retraction of the height-adjusting oil cylinder can drive the swing arm shell to swing up and down. The oil cylinder accommodating cavity is a semi-closed cavity, which can provide enough space for the swing and accommodation of the height-adjusting oil cylinder and the laying of pipelines.

[0052] The middle upper part of the connecting arm is the narrowest in the left and right widths, and the left and right widths become wider as they are closer to the upper and lower ends, especially the lower part, which is used for arranging the oil cylinder outer accommodating cavity. The narrowest part in the left and right widths is preferably at the same height as the front hinge connecting hole. The top surface of the connecting arm is a slope, and the top surface of the connecting arm in the left and right directions is higher as it is closer to the high-speed end of the same side arm support. The above-mentioned 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.

[0053] The root of the arm support close to the rear arm is preferably provided with a rear protruding bump structure 115, and the bump structure improves the connection strength of the rear arm and the arm support. The internal cavity of the bump structure is an auxiliary cavity, which is part of the internal cavity of the arm support, and increases the oil storage volume of the oil cavity of the arm support.

[0054] The connecting arm is provided with an internal cavity, which is communicated with the internal cavity of the arm support, and a reinforced cooler is arranged in the internal cavity of the connecting arm, which is used for reinforcing the cooling of the oil cavity, so as to improve the cooling effect of the high-power density swing arm.

[0055] The side of the connecting arm close to the low speed end of the boom is preferably provided with a concave circular cylindrical surface coaxial with the output gear of the rear cutting transmission mechanism, which can keep a certain equidistant gap with the drum blade, improving the loading effect of the drum screw conveyor.

[0056] The overhanging end outer surface 1111 of the front arm, the high speed end outer surface 1131 of the boom and the overhanging end outer surface 1121 of the rear arm on the same swing arm shell are provided with a first group of convex circular cylindrical surfaces coaxial with the front hinged connection hole, and the corresponding front groove, middle groove and rear groove are provided with a first group of concave circular cylindrical surfaces coaxial with the front hinged connection hole, and the first group of concave circular cylindrical surfaces correspond to the first group of convex circular cylindrical surfaces and are spaced from each other. The overhanging end outer surface of the first lug and the overhanging end outer surface of the second lug on the same side are provided with a second group of convex circular cylindrical surfaces coaxial with the front hinged connection hole, and the side 1141 of the connecting arm close to the high speed end of the boom is provided with a second group of concave circular cylindrical surfaces coaxial with the front hinged connection hole, and the second group of convex circular cylindrical surfaces correspond to the second group of concave circular cylindrical surfaces and are spaced from each other. By controlling the size of the above-mentioned spacing within a suitable range, the accumulation of coal and rock into the swing arm shell and the fuselage during the up and down swing of the swing arm shell can be effectively controlled, ensuring smooth swing.

[0057] The input gear core of the rear cutting transmission mechanism is provided with a rear spline hole, and a spline sleeve 124 with an inner spline and an outer spline is installed in the rear spline hole. The spline hole of the spline sleeve and the spline hole of the output gear core of the front cutting transmission mechanism are simultaneously spline-coupled with a spline shaft 123. The front cutting transmission mechanism and the spline shaft, the spline shaft and the spline sleeve, and the spline sleeve and the rear cutting transmission mechanism are all spline-coupled, and the spline-coupled structure with side clearance at multiple places can significantly increase the radial floating amount. Since the related parts forming the spline-coupled structure can automatically center, even if the coaxiality of the front and rear hinged connections decreases due to wear, the influence on the power transmission between the front and rear cutting transmission mechanisms is relatively small, and therefore the power transmission reliability is improved.

[0058] The front and rear hinged connection points are separately arranged in front of and behind the power transmission connection point between the front and rear cutting transmission mechanisms. The radial displacement of the two hinged connection points due to wear has less influence on the power transmission connection point located therebetween, and therefore the influence on the transmission accuracy can be reduced.

[0059] The front wear sleeve is respectively arranged in the ear hole of the first ear seat and the ear hole of the front part of the second ear seat, and the rear wear sleeve is respectively arranged in the ear hole of the third ear seat and the ear hole of the front part of the rear part of the machine body. The sliding bearing 14 is arranged in the front and rear hinged connection holes, and the load at the hinge is mainly borne by the sliding bearing, which can well protect the swing arm shell, the machine body shell and the cutting motor from being affected or less affected, and maintain the connection reliability. The front and rear sliding bearings are respectively sleeved and arranged in the middle part of the front pin shaft sleeve 41 and the rear pin shaft sleeve 42, the front part and the rear part of the front pin shaft sleeve are tightly matched with the front wear sleeve, and the front part and the rear part of the rear pin shaft sleeve are tightly matched with the rear wear sleeve. The inner hole of the front pin shaft sleeve is communicated with the inner hole of the second ear seat, and the limiting rod is arranged in the two inner holes. The rear end of the limiting rod extends into the rear stage spline hole to axially limit the front end of the spline shaft, the front part of the limiting rod is positioned and fixed relative to the front pin shaft sleeve, and the remaining part of the limiting rod does not contact the inner holes of the front pin shaft sleeve and the second ear seat and the rear stage spline sleeve. Further, the rear end of the limiting rod can be sleeved and fixed with a wear pad, and the limiting rod axially limits the spline shaft by means of the wear pad. The spline shaft contacts and rotates relative to the wear pad. In the embodiment, the front end of the limiting rod is axially fixed on the front pin shaft sleeve by the snap spring and is radially supported on the front pin shaft sleeve.

[0060] The bearing preferably adopts a joint bearing, which has large load capacity, impact resistance, corrosion resistance, wear resistance and self-aligning. The adoption of the joint bearing helps to maintain the coaxiality between each of the front and rear hinged connection holes and the output gear of the front stage cutting transmission mechanism and the input gear of the rear stage cutting transmission mechanism.

[0061] A wear-reducing layer is further arranged between the inner ring and the outer ring of the joint bearing to reduce the wear of the sliding pair of the bearing. A sealing seat is respectively arranged at 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 of the sealing seat, and a sealing ring is arranged in the sealing groove. The adoption of the joint bearing can improve the service life of the sliding pair and also helps to improve the transmission accuracy between the front and rear stage cutting transmission mechanisms.

[0062] The machine body can include a front body part shell 21 of a front body part 2 and a rear body part shell 31 of a rear body part 3 which are positioned by a large plane and a plurality of positioning pins 29 and fixed by fasteners. The left and right edges of the front body part shell are each provided with the first lug 211, the second lug 212 and the front connecting base 213 from front to back in sequence, and the second lug and the front connecting base form the middle groove 215. The rear body part shell includes a rear base and a rear connecting base 311 which is suspended left and right in the middle of the rear base and faces forward, and the rear connecting base and the rear base form the rear groove 312. The cutting motor and the front-stage cutting transmission mechanism are installed in the front body part shell, and the left and right output end gears of the front-stage cutting transmission mechanism are respectively located in the left and right front connecting bases. The rear arm is hinged to the rear connecting base and the rear base. The front connecting base and the rear connecting base are connected and fixed to form the third lug. The left and right swing arm shells are respectively located on the front side of the left and right parts of the rear base.

[0063] The front body part shell is a multi-chamber thin-walled frame structure, and the rear body part shell is a solid structure. The machine body is narrow in front and wide at the rear, empty in front and solid at the rear, which makes the center of gravity of the machine body move to the rear and improves the stability of the coal mining machine.

[0064] The lower surface of the rear body part shell is provided with a loading cavity 313 on the left and right sides, which is a groove extending from front to back with a notch facing down, and the rear end of the loading cavity is closed. The two loading cavities in the left and right directions are respectively opposite to the front and rear of the middle part of the arm support on the same side. The coal flow below the middle part of the arm support can enter the conveying groove 95 of the conveyor 9 located below the rear body part shell through the loading cavity. The setting of the loading cavity is equivalent to adding a coal flow channel, so the coal loading effect can be improved. The front part of the groove bottom of the loading cavity can be a horizontal plane, and the rear part can be a slope with the front being high and the rear being low.

[0065] The thin coal seam compact coal mining machine further includes two left and right support shoes 6 with guides, and the two left and right support shoes are respectively located behind, preferably directly behind, the low-speed end of the left and right arm supports, and the support shoes are supported on the shovel plate 91 of the conveyor and fixedly connected with the rear body part shell. The loading cavities in the left and right directions are located inside the two left and right support shoes. The support shoes can separate the coal flow inside and outside the drum left and right, which can reduce the influence of the coal flow outside the center line of the drum on the coal flow inside when the coal mining machine moves, and ensure the coal loading effect of the coal flow channel where the loading cavities are located.

[0066] Unless otherwise specified, the front and rear directions mentioned herein refer to the direction close to the coal wall and the direction away from the coal wall respectively.

Claims

1. A thin-seam compact miner characterized by: The utility model provides a cutting machine, including fuselage, left and right two swing arm casing and left and right two height -adjusting oil cylinders, the left and right edges of the front of fuselage each is by first lug, second lug and third lug from front to back are equipped in proper order, and the front recess is formed between first lug and second lug, and the middle recess is formed between second lug and third lug, and the rear recess is formed between third lug and the rear of fuselage, and the cavity of the front of fuselage is installed with cutting motor and front cutting transmission mechanism, and front cutting transmission mechanism includes left and right two sets of fixed shaft gear transmission mechanism, and fixed shaft gear transmission mechanism includes left and right extension arrangement and transmission connection in proper order input end gear, idler gear set and output end gear, and left and right two sets of fixed shaft gear transmission mechanism share an input end gear, and the input end gear is coaxial transmission connection with the output shaft of cutting motor, and left and right two output end gears are located in the front chamber of left and right two third lug respectively, the main part of swing arm casing is the arm support of left and right extension, and the rear cutting transmission mechanism is installed in arm support, and the end where the input end gear and output end gear of rear cutting transmission mechanism are located is as the high speed end and low speed end of arm support respectively, and the connecting arm of self arm support forward overhanging is equipped in arm support middle part, and the front arm of self connecting arm left or right overhanging is equipped on connecting arm, and the rear arm of arm support high speed end rear is equipped, and the rear arm is the cantilever structure of one end connecting in arm support, and the front hinged connection hole and rear hinged connection hole are respectively equipped on front arm and rear arm, and the front arm, arm support high speed end and rear arm are inserted in front recess, middle recess and rear recess respectively, wherein the front arm is hinged with first lug and second lug, and the rear arm is hinged with third lug and the rear of fuselage, and the output end gear of front cutting transmission mechanism and the input end gear of rear cutting transmission mechanism are coaxial transmission connection, and the both are coaxial with left and right same side front hinged connection hole, and the lower part of fuselage is equipped with the oil cylinder content holding cavity of left and right extension, opening downward, and the lower part of the connecting arm of left and right two swing arms is all equipped with the oil cylinder outer containing cavity of left and right extension, opening downward, and one end of oil cylinder outer containing cavity is sealed in left and right direction, and the other end is opposite to oil cylinder content holding cavity, and left and right two oil cylinder outer containing cavities and oil cylinder content holding cavity are combined into left and right two oil cylinder containing cavities, and left and right two height -adjusting oil cylinders are located in left and right two oil cylinder containing cavities respectively, and one end of height -adjusting oil cylinder is hinged on connecting arm, and the other end is hinged on fuselage, and the hinged axis is all front and rear extension.

2. A thin-seam compact miner as claimed in claim 1, characterized in that: The connecting arm extends downward beyond the bottom surface of the middle part of the arm support, the left and right width of the middle and upper part of the connecting arm is the narrowest, the left and right width becomes wider as it gets closer to the upper and lower ends, and the lower part is wider for setting the oil cylinder outer containing cavity, the top surface of the connecting arm is an inclined surface, and the top surface of the connecting arm gets higher as it gets closer to the high speed end of the same side arm support in the left and right direction.

3. A thin-seam compact miner as claimed in claim 1, characterized in that: The connecting arm is provided with an inner cavity that is in communication with the inner cavity of the arm support, and a reinforced cooler is arranged in the inner cavity of the connecting arm.

4. A thin-seam compact miner as claimed in claim 1, characterized in that: The side surface of the connecting arm close to the low speed end of the arm support in the left and right direction is provided as an inner concave circular cylindrical surface coaxial with the output end gear of the rear cutting transmission mechanism.

5. A thin-seam compact miner as claimed in claim 1, characterized in that: The overhanging end outer surface of the front arm, the high-speed end outer surface of the arm support and the overhanging end outer surface of the rear arm on the same swing arm shell are provided as a first group of convex circular cylindrical surfaces coaxial with the front hinge connecting hole, and the corresponding front groove, middle groove and rear groove are provided as a first group of concave circular cylindrical surfaces coaxial with the front hinge connecting hole, the first group of concave circular cylindrical surfaces corresponding to the first group of convex circular cylindrical surfaces and leaving a space between each other; the overhanging end outer surface of the first ear seat and the overhanging end outer surface of the second ear seat on the same side are provided as a second group of convex circular cylindrical surfaces coaxial with the front hinge connecting hole, and the side of the connecting arm close to the high-speed end of the arm support is provided as a second group of concave circular cylindrical surfaces coaxial with the front hinge connecting hole, the second group of convex circular cylindrical surfaces coaxial with the second group of concave circular cylindrical surfaces and leaving a space between each other.

6. A thin-seam compact miner as claimed in claim 1, characterized in that: The input end gear core of the rear stage cutting transmission mechanism is provided with a rear stage spline hole, and a spline sleeve with an inner spline and an outer spline is installed in the rear stage spline hole. The spline hole of the spline sleeve and the spline hole of the output end gear core of the front stage cutting transmission mechanism are simultaneously spline-coupled with a spline shaft.

7. A thin-seam compact miner as claimed in claim 1, 2, 3, 4, 5 or 6, characterized in that: A front wear sleeve is respectively installed in the ear hole of the first ear seat and the ear hole of the front part of the second ear seat, a rear wear sleeve is respectively installed in the ear hole of the third ear seat and the ear hole provided on the front section of the rear part of the machine body, a sliding bearing is installed in the front and rear hinge connecting holes, the front and rear sliding bearings are respectively sleeved and installed in the middle part of the front pin shaft sleeve and the rear pin shaft sleeve, the front part and the rear part of the front pin shaft sleeve are tightly matched with the front wear sleeve, the front part and the rear part of the rear pin shaft sleeve are tightly matched with the rear wear sleeve, the inner hole of the front pin shaft sleeve is communicated with the inner hole of the second ear seat, a limiting rod is installed in the two inner holes, the rear end of the limiting rod extends into the rear stage spline hole to axially limit the front end of the spline shaft, the front part of the limiting rod is fixed relative to the front pin shaft sleeve, and the remaining part of the limiting rod does not contact the front pin shaft sleeve, the inner hole of the second ear seat and the rear stage spline sleeve.

8. A thin-seam compact miner as claimed in claim 1, 2, 3, 4, 5, 6 or 7, characterized in that: The machine body comprises a front main body shell and a rear main body shell which are butted and fixed, the left and right edges of the front main body shell are each provided with the first ear seat, the second ear seat and the front connecting base in sequence from front to back, the middle groove is formed between the second ear seat and the front connecting base, the rear main body shell comprises a rear base body and a rear connecting base which is suspended from the rear base body in front-to-back direction, the rear connecting base and the rear base body form the rear groove, the cutting motor and the front stage cutting transmission mechanism are installed in the front main body shell, the left and right two output end gears of the front stage cutting transmission mechanism are respectively located in the left and right two front connecting bases, the rear arm is hinged with the rear connecting base and the rear base body, the front connecting base and the rear connecting base are butted and fixed to form the third ear seat, and the left and right two swing arm shells are respectively located on the front side of the left part and the right part of the rear base body.

9. A thin-seam compact miner as claimed in claim 8, characterized in that: The front main body shell is a multi-chamber thin-walled frame structure, and the rear main body shell is a solid structure.

10. A thin-seam compact miner as claimed in claim 8, characterized in that: The lower surface of the rear main body shell is provided with a loading cavity on each of the left and right sides, the loading cavity is a groove extending from front to back with a notch facing downward, the rear end of the loading cavity is closed, and the two loading cavities in the left-right direction are respectively opposite to the front and rear of the middle part of the arm support on the same side.

11. A thin-seam compact miner as claimed in claim 10, characterized in that: The support sliding shoes are provided with left and right guiding parts, and the left and right guiding parts are respectively arranged on the left and right sides of the rear main body part. The left and right support sliding shoes are respectively arranged at the rear of the low-speed end of the left and right arm supports, and the support sliding shoes are fixedly connected with the rear main body part shell.

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