CN216841654U - Cutting mechanism of compact coal mining machine for thin coal seam - Google Patents

Abstract

The utility model relates to a cutting mechanism of a compact coal mining machine for thin coal seams, which comprises a swing arm shell and a machine body consisting of a front main body part shell and a rear main body part shell which are butted and fixed front and rear, wherein the main body of the swing arm shell is an arm support extending left and right, the middle part of the arm support is provided with a connecting arm which is cantilevered forward, a front arm which extends left and right is arranged on the connecting arm, a rear arm is arranged at the rear part of the arm support, a rear cutting transmission mechanism is arranged in the arm support, the front arm and the rear arm are respectively connected with the front, the rear main body shell is hinged, a front stage cutting transmission mechanism and a cutting motor are installed in the front main body shell, an output shaft of the cutting motor is coaxially connected with an input gear of the front stage cutting transmission mechanism in a transmission manner, an output gear of the front stage cutting transmission mechanism is coaxially connected with an input gear of the rear stage cutting transmission mechanism in a transmission manner, and two ends of the oil cylinder are respectively hinged with the lower portion of the connecting arm and the lower portion of the front main body shell. The utility model discloses can provide great exploitation scope, shorten the fuselage, improve coal-winning machine focus problem.

Description

Cutting mechanism of compact coal mining machine for thin coal seam

Technical Field

The utility model relates to a coal-winning machine cutting mechanism especially is applicable to the thin seam coal-winning machine, helps enlarging the scope of exploitation and shortens the fuselage.

Background

In the existing thin seam coal mining machine, a cutting motor is usually positioned on a rocker arm and swings along with the swinging of the rocker arm. When the rear rocker arm in the advancing direction of the thin seam cantilever coal mining machine adopts the upper cutter, the problem that the mining height of the rear roller is too small can occur, and the reason is that when the mining height is increased again, the cutting motor of the rear rocker arm interferes with an upper coal platform left after the front roller cuts the bottom cutter, so that the overall mining height of the coal mining machine is too narrow, and the coal mining machine cannot meet the mining requirement of large change of the thickness of a mineral layer of a working face of a thin seam in China.

In order to solve the problems, the industry proposes that the cutting part is a swinging part and a fixed part, and the cutting motor and the main body of the cutting transmission system are arranged on the fixed part, so that the structure of the fixed part is too complex, the left and right lengths of the machine body suspension section are too long, the weight is too large, and the gravity center problem of the whole machine still has great influence on the stress of the whole machine. Moreover, the structure of the driving oil cylinders with the swing arms arranged on the left side or the right side of the cutting motor on the machine body further causes the machine body to be overlong, the coal mining machine with a long machine body structure cannot execute a straight-pushing cutter process similar to a short-wall coal mining machine, the time for inclined cutting cutters at two ends is long, and the mining efficiency is limited to a certain extent.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a thin seam compact coal-winning machine cutting mechanism can provide great exploitation scope, shorten the fuselage, improve the coal-winning machine focus problem.

The utility model discloses a main technical scheme has:

a compact coal cutter cutting mechanism for a thin coal seam comprises a swing arm shell, a front main body shell and a rear main body shell, wherein the front main body shell and the rear main body shell are in front-back butt joint and are positioned through a large plane and a plurality of positioning pins and are fixed through fasteners, a first lug seat, a second lug seat and a connecting base are sequentially arranged on the right edge or the left edge of the front main body shell from front to back, a front groove is formed between the first lug seat and the second lug seat, a middle groove is formed between the second lug seat and the connecting base, the rear main body shell comprises a rear base body and a third lug seat which is positioned in front of the middle of the rear base body and extends rightwards or leftwards, a rear groove is formed between the third lug seat and the rear base body, a front cutting transmission mechanism and a cutting motor are installed in the front main body shell, and the front cutting transmission mechanism comprises input gears, a left gear and a right gear, a left gear, a right gear, a left gear, a right gear, a connecting gear, a gear and a gear, a gear and a gear, the output shaft of the cutting motor is coaxially connected with the input end gear of the preceding cutting transmission mechanism in a transmission manner, the output end gear of the preceding cutting transmission mechanism is positioned in the connecting base, the main body of the swing arm shell is an arm frame extending leftwards and rightwards, the arm frame is internally provided with a rear cutting transmission mechanism, the ends of the input end gear and the output end gear of the rear cutting transmission mechanism are respectively called as a high-speed end and a low-speed end of the arm frame, the middle part of the arm frame is provided with a connecting arm which is cantilevered forwards from the arm frame, the connecting arm is provided with a front arm which is cantilevered leftwards or rightwards from the connecting arm, the rear arm is arranged behind the high-speed end of the arm frame, the rear arm is a cantilever structure with one end connected onto the arm frame, the high-speed end and the rear arm of the front arm, the high-speed end and the rear arm of the arm are respectively embedded into a front groove, a middle groove and a rear groove, the front arm is hinged with a first ear seat and a second ear seat, and the rear arm is hinged with a third ear seat and a rear base body, the output end gear of the front stage cutting transmission mechanism is coaxially connected with the input end gear of the rear stage cutting transmission mechanism in a transmission way, and the axis of the front stage cutting transmission mechanism is coaxial with the hinge axis hinged with the front and the rear parts.

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

The cantilever end surface of forearm, the high-speed end surface of cantilever crane and the cantilever end surface of postbrachium set to with the coaxial first group evagination circular arc cylinder of two articulated hinge axes in front and back, preceding recess, well recess and back recess set to with the coaxial first group indent circular arc cylinder of two articulated hinge axes in front and back, first group indent circular arc cylinder and first group evagination circular arc cylinder one-to-one and leave the interval each other, all install the sealing washer on the respective front and back terminal surface of forearm, cantilever crane's high-speed end and postbrachium.

A bulge structure protruding backwards can be arranged at a position, close to the root of the rear arm, on the arm support, a cavity in the bulge structure is an auxiliary cavity, and the auxiliary cavity is a part of an inner cavity of the arm support.

The connecting arm is provided with an inner cavity and is communicated with the inner cavity of the arm support, and the inner cavity of the connecting arm can be provided with a reinforced cooler.

The compact coal mining machine cutting mechanism for the thin coal seam further comprises a heightening oil cylinder, one end of the heightening oil cylinder is hinged to the lower portion of the connecting arm, the other end of the heightening oil cylinder is hinged to the lower portion of the front main body portion shell, and two hinged axes horizontally extend back and forth.

The lower part of linking arm and the lower part of preceding main part casing are equipped with respectively and control extension, open-down hydro-cylinder and hold the chamber outward and hold the chamber in the hydro-cylinder, and wherein the hydro-cylinder holds the chamber outward and seals in the direction one end, and the other end holds the chamber relative with the hydro-cylinder in, the hydro-cylinder that the hydro-cylinder setting of increaseing held the chamber and constitutes in the hydro-cylinder holds the intracavity outward by the hydro-cylinder.

The left and right width of the middle upper part of the connecting arm is the narrowest, the left and right width of the connecting arm is wider as the connecting arm is closer to the upper end part and the lower end part, the top surface of the connecting arm is an inclined surface, and the top surface of the connecting arm in the left and right directions is higher as the top surface of the connecting arm is closer to the high-speed end of the arm support.

The front wear-resistant 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, the back wear-resistant sleeve is respectively arranged in the ear hole of the third ear seat and the ear hole of the front part of the back base body, the front sliding bearing and the back sliding bearing are respectively arranged in the front hinge connecting hole and the back hinge connecting hole which participate in the hinge joint on the front arm and the back arm, the front sliding bearing and the back sliding bearing are respectively sleeved and arranged in the middle parts of the front pin shaft sleeve and the back pin shaft sleeve, the front part and the back part of the front pin shaft sleeve are tightly matched with the front wear-resistant sleeve, the front part and the back part of the back pin shaft sleeve are tightly matched with the back wear-resistant sleeve, the inner hole of the front pin shaft sleeve is communicated with the inner hole of the second ear seat, the limit rods are arranged in the two inner holes, the back ends of the limit rods extend into the back spline holes to axially limit the front end of the spline shaft, the front part of the limit rods is fixed relative to the front pin shaft sleeve, and the rest parts of the limit rods are not contacted with the inner hole of the front pin shaft sleeve, the second ear seat and the back spline sleeve, the rear end of the limiting rod is sleeved with and fixed with a wear-resistant pad, and the limiting rod carries out axial limiting on the spline shaft by means of the wear-resistant pad.

The front part and the rear part of an input end gear of the pre-stage cutting transmission mechanism are respectively provided with a spline hole, the spline hole at the front part is in coaxial transmission connection with an output shaft of the cutting motor, and the spline hole at the rear part is in coaxial connection with an input shaft of a gear pump of a hydraulic system.

The front part and the rear part of an output end gear of the pre-stage cutting transmission mechanism are respectively provided with a spline hole, the spline hole at the front part is coaxially connected with the spline shaft, and the spline hole at the rear part is a power output port for outputting power for the crushing mechanism.

The left and right edges of the front main body shell are respectively provided with the first ear seat, the second ear seat and the connecting base, the rear main body shell is correspondingly provided with the left and right two third ear seats and the rear groove, the left and right two swing arm shells are hinged with the front main body shell and the rear main body shell from the left and right sides, two sets of front-stage cutting transmission mechanisms are arranged in the front main body shell, the two sets of front-stage cutting transmission mechanisms share one input gear, and the number of idler wheels in the idler group of the two sets of front-stage cutting transmission mechanisms is different.

The utility model has the advantages that:

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

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

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

The bulge structure is arranged on the arm support, so that the connection strength of the rear arm and the arm support is improved, and the oil storage volume of an oil cavity of the arm support is increased.

The reinforced cooler is arranged in the inner cavity of the connecting arm, so that the cooling oil cavity is reinforced, and the cooling effect of the high-power density swing arm is improved.

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

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

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

The joint bearing can ensure the cleanness of the internal friction pair by arranging the dust isolating structures at the two ends. And an antifriction layer is arranged between the inner ring and the outer ring of the joint bearing, so that the abrasion of a bearing sliding pair can be reduced.

The end part of the input end gear of the pre-stage cutting transmission mechanism is provided with a spline hole, so that power can be transmitted to the gear pump to provide a power source for a hydraulic system; the rear portion of output gear of preceding stage cutting drive mechanism sets up the splined hole, can give crushing mechanism with power transmission, makes gear pump and crushing mechanism need not to set up extra power supply on the one hand, and not only the structure is simpler, saves installation space moreover, is favorable to making the fuselage compacter, and on the other hand makes the power of cutting motor obtain more abundant utilization.

Drawings

Fig. 1 is a schematic view of an embodiment of the present invention;

fig. 2 is a top cross-sectional view of an embodiment of the present invention;

FIG. 3 is a schematic view of the front body portion of FIG. 2;

FIG. 4 is a schematic view of the swing arm of FIG. 2;

FIG. 5 is a schematic view of the swing arm of FIG. 1;

FIG. 6 is a cross-sectional view A-A of FIG. 2;

FIG. 7 is a schematic structural view of an embodiment of a front plain bearing;

FIG. 8 is a schematic structural view of one embodiment of the rear body portion.

Reference numerals:

1. a swing arm; 11. a swing arm housing; 111. a forearm; 1111. the outer surface of the overhanging end of the forearm; 112. a rear arm; 1121. the outer surface of the overhanging end of the rear arm; 113. a boom; 1131. the outer surface of the high-speed end of the arm support; 114. a connecting arm; 1141. the side surface is close to the high-speed end of the arm support; 1144. an oil cylinder outer accommodating cavity; 115. a ridge structure; 12. a rear stage cutting transmission mechanism; 121. an input end gear; 122. a planetary reduction mechanism; 123. a spline shaft; 124. a spline housing; 13. a drum; 141. a front sliding bearing; 1411. an inner ring; 1412. an outer ring; 1413. an anti-attrition layer; 1414. a sealing seat; 1415. a seal ring; 1416. a sealing seat; 1417. a seal ring; 1418. a flat bond; 142. a rear slide bearing;

2. a front body portion; 21. a front body section housing; 211. a first ear mount; 212. a second ear mount; 213. a connection base; 214. a front groove; 215. a middle groove; 216. an accommodating cavity is formed in the oil cylinder; 22. a cutting motor; 23. a clutch mechanism; 24. an input end gear; 241. a splined bore; 242. a splined bore; 25. an output end gear; 251. a splined bore; 252. a splined bore; 29. positioning pins;

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

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

5. and (5) heightening the oil cylinder.

Detailed Description

The utility model discloses a thin coal seam compact coal-winning machine cutting mechanism (can be referred to as cutting mechanism for short), as shown in fig. 1-8, including the swing arm casing 11 of swing arm 1, the preceding main part casing 21 of preceding main part 2 and the back main part casing 31 of back main part 3, preceding main part casing and back main part casing butt joint all around, the two is fixed a position through big plane and a plurality of locating pin 29, through the fixed fuselage that constitutes of fastener. The right edge or the left edge of the front main body part shell is sequentially provided with a first ear seat 211, a second ear seat 212 and a connecting base 213 from front to back, a front groove 214 is formed between the first ear seat and the second ear seat, and a middle groove 215 is formed between the second ear seat and the connecting base. The rear body section case 31 includes a rear base and a third ear piece 311 cantilevered rightward or leftward in front of the middle of the rear base, with a rear recess 312 formed between the third ear piece and the rear base.

The front body shell is internally provided with a front stage cutting transmission mechanism and a cutting motor 22, the front stage cutting transmission mechanism comprises an input gear 24, an idler wheel set and an output gear 25 which are sequentially arranged in the left-right direction and are sequentially connected in a transmission way, and the output shaft of the cutting motor is coaxially connected with the input gear of the front stage cutting transmission mechanism in a transmission way, and in the embodiment shown in the attached drawing, the two are coaxially connected through a clutch mechanism 23. And an output end gear of the preceding stage cutting transmission mechanism is positioned in the connecting base.

The main body of the swing arm shell is a cantilever crane 113 extending left and right, and a rear-stage cutting transmission mechanism 12 is installed in the cantilever crane. The rear cutting transmission mechanism adopts a fixed shaft gear transmission mechanism and comprises an input end gear 121, an idler wheel group and an output end gear which are sequentially arranged in the left-right direction and are sequentially connected in a transmission manner. In order to distinguish the two ends of the arm support conveniently, the ends of the input end gear and the output end gear of the rear-stage cutting transmission mechanism are respectively called a high-speed end and a low-speed end of the arm support. The planetary reducing mechanism 122 is installed on the front side of the low-speed end of the arm support, and the roller 13 is sleeved on the planetary reducing mechanism and is coaxially and fixedly connected with a planet carrier of the planetary reducing mechanism. A connecting arm 114 which is cantilevered forwards from the arm support is arranged in the middle of the arm support, and a front arm 111 which is cantilevered leftwards or rightwards from the connecting arm is arranged on the connecting arm, namely for a right swing arm shell of the coal mining machine, the front arm is cantilevered leftwards from the connecting arm; for the left swing arm housing of the shearer, the forearm depends rightwardly from the link arm. The rear arm 112 is arranged behind the high-speed end of the arm support, and the rear arm is of a cantilever structure with one end connected to the arm support.

The high-speed end and the rear arm of the front arm and the arm support are respectively inserted into the front groove, the middle groove and the rear groove, wherein the front arm is hinged with the first ear seat and the second ear seat, and the rear arm is hinged with the third ear seat and the rear base body. The output end gear 25 of the fore cutting transmission mechanism and the input end gear 121 of the rear cutting transmission mechanism are coaxially connected in a transmission way, and the axes of the output end gear and the input end gear are coaxial with the hinge axes hinged at the front and the rear parts, so that the fore cutting transmission mechanism can transmit power to the rear cutting transmission mechanism and the swing arm can swing up and down relative to the front and the rear main body part shells at the same time without mutual interference. And the front end surface and the rear end surface of each of the front arm, the high-speed end of the arm support and the rear arm are respectively provided with a sealing ring for realizing the end surface sealing of the relative swing joint surface between the swing arm shell and the shells of the front main body part and the rear main body part.

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

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

The outer surface 1111 of the overhanging end of the front arm, the outer surface 1131 of the high-speed end of the arm support and the outer surface 1121 of the overhanging end of the rear arm are arranged into a first group of convex arc cylindrical surfaces which are coaxial with the hinge axes hinged at the front and the rear positions, the groove bottom surfaces of the front groove, the middle groove and the rear groove are arranged into a first group of concave arc cylindrical surfaces which are coaxial with the hinge axes hinged at the front and the rear positions, and the first group of concave arc cylindrical surfaces are in one-to-one correspondence with the outer first group of convex arc cylindrical surfaces and have intervals between the first group of concave arc cylindrical surfaces and the outer first group of convex arc cylindrical surfaces.

Similarly, the outer surfaces of the overhanging ends of the first ear seat and the second ear seat are set to be a second group of convex arc cylindrical surfaces coaxial with the hinge axes hinged at the front and the rear parts, the side surface 1141, close to the high-speed end of the arm support, of the connecting arm is set to be a second group of concave arc cylindrical surfaces coaxial with the hinge axes hinged at the front and the rear parts, and a gap is reserved between the outer surfaces of the overhanging ends of the first ear seat and the second ear seat and the connecting arm.

By controlling the size of the corresponding interval within a proper range, the coal rock accumulation can be effectively controlled to enter between the swing arm shell and the front and rear main body part shells in the up-and-down swing process of the swing arm shell, and the smoothness of swing is ensured.

A bulge structure 115 protruding backwards is preferably arranged on the arm support and close to the root of the rear arm, and the bulge structure improves the connection strength of the rear arm and the arm support. The cavity in the bulge structure is an auxiliary cavity which is a part of the inner cavity of the arm support, and the oil storage volume of the oil cavity of the arm support is increased.

The connecting arm is provided with an inner cavity and is communicated with the inner cavity of the arm support, and the inner cavity of the connecting arm is internally provided with a strengthening cooler for strengthening a cooling oil cavity so as to improve the cooling effect of the high-power density swing arm.

The cutting mechanism further comprises a height-adjusting oil cylinder 5, one end of the height-adjusting oil cylinder is hinged with the lower portion of the connecting arm, the other end of the height-adjusting oil cylinder is hinged with the lower portion of the front main body portion shell, and two hinged axes horizontally extend back and forth. The heightening oil cylinder is arranged below the cutting motor, so that the space occupation is obviously reduced in the left and right directions, and the compact short-body coal mining machine structure is guaranteed.

The lower part of the connecting arm and the lower part of the front main body part shell are respectively provided with an outer cylinder containing cavity 1144 and an inner cylinder containing cavity 216 which extend from left to right and are opened downwards, wherein one end of the outer cylinder containing cavity at the lower part of the connecting arm in the left-right direction is sealed, and the other end of the outer cylinder containing cavity is opposite to the inner cylinder containing cavity. The heightening oil cylinder is arranged in an oil cylinder accommodating cavity formed by an oil cylinder outer accommodating cavity and an oil cylinder inner accommodating cavity. The oil cylinder outer containing cavity is located at the position of the middle part of the connecting arm, which is close to the front end, in the front-back direction, a pair of oil cylinder outer pin holes are formed in the front-back cavity wall of the oil cylinder outer containing cavity, the axes of the oil cylinder outer pin holes extend back and forth, and the oil cylinder outer pin holes are close to the low-speed end of the arm support in the left-right direction. The heightening oil cylinder can stretch and retract to drive the swing arm shell to swing up and down around the front main body part shell and the rear main body part shell. The oil cylinder accommodating cavity is a semi-closed cavity and can provide enough space for heightening the swing of the oil cylinder, accommodating certain coal and laying pipelines.

The left and right width of the middle upper part of the connecting arm is narrowest, the left and right width of the connecting arm is wider as the connecting arm is closer to the upper end part and the lower end part, particularly the lower part of the connecting arm is wider, the connecting arm is used for arranging the oil cylinder outer containing cavity, and the whole connecting arm forms a flat and thin structure. The narrowest part of the left and right width is preferably as high as the output shaft of the cutting motor. The top surface of the connecting arm is an inclined surface, and the top surface of the connecting arm in the left-right direction is higher closer to one end of the high-speed end of the arm support. The flat thin structure and the special inclined plane structure of the connecting arm enable the swing arm shell to basically not affect an upper coal platform when swinging up and down, and therefore a large mining range can be obtained.

Wear-resisting cover before installing in the earhole of first ear seat and the earhole of second ear seat front portion respectively, wear-resisting cover after installing in the earhole of third ear seat and the earhole of back base member front portion respectively. The front arm and the rear arm are respectively provided with a front sliding bearing 141 and a rear sliding bearing 142 in a front hinge connecting hole and a rear hinge connecting hole which participate in the hinge joint, the front sliding bearing and the rear sliding bearing are respectively sleeved in the middle parts of the front pin shaft sleeve 41 and the rear pin shaft sleeve 42, the front part and the rear part of the front pin shaft sleeve are tightly matched with the front wear-resistant sleeve, and the front part and the rear part of the rear pin shaft sleeve are tightly matched with the rear wear-resistant sleeve. The inner hole of the front pin shaft sleeve is communicated with the inner hole of the second ear seat, a limiting rod can be 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 fixed relative to the front pin shaft sleeve, and the rest part of the limiting rod is not in contact with the front pin shaft sleeve, the inner hole of the second ear seat and the rear-stage spline sleeve. Furthermore, the rear end of the limiting rod can be fixedly provided with a wear pad in a sleeved mode, the limiting rod is used for axially limiting the spline shaft through the wear pad, and the spline shaft is in contact with the wear pad and rotates relative to the wear pad. In this embodiment, the front end of the limiting rod is axially fixed on the front pin sleeve through the snap spring and radially supported on the front pin sleeve.

The front part and the rear part are hinged to the left side or the right side close to the cutting motor, other structures are not arranged between the front part and the rear part, the pin shaft structure at the hinged part is small in diameter, and the occupied space in the left and right directions is small, so that the left and right length of the body of the coal mining machine, particularly the body section of the suspension machine, is obviously shortened. The bearing is arranged in the pin shaft structure to bear most of load, so that even if the pin shaft structure is worn and failed after long-term use, the pin shaft structure cannot cause abrasion deformation of the shell of the swing arm and the shell of the machine body, and the connection reliability can still be kept higher after a new pin shaft structure part is replaced, so that the hinge structure also improves the connection reliability of the swing arm and the machine body. When the top cutter is cut by the roller, the inner side of the roller only changes the up-and-down position of the connecting arm part along with the swinging of the swinging arm, and the flat thin structure and the special inclined surface structure of the connecting arm are combined, so that the upper coal platform is basically not influenced when the swinging arm shell swings up and down, and a large mining range can be ensured.

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

The front part and the rear part of an input end gear 24 of the fore cutting transmission mechanism are respectively provided with spline holes 241 and 242, the spline hole 241 at the front part is coaxially connected with an output shaft of a cutting motor in a transmission way, and the spline hole 242 at the rear part is coaxially connected with an input shaft of a gear pump of a hydraulic system. Because the input end gear of the fore cutting transmission mechanism transmits part of power to the gear pump, the hydraulic system does not need to be additionally provided with an independent power source.

The front part and the rear part of the output end gear 25 of the fore cutting transmission mechanism are respectively provided with a spline hole 251 and a spline hole 252, the spline hole 251 at the front part is coaxially connected with the spline shaft, and the spline hole 252 at the rear part can be used as a reserved power output port for outputting power for the crushing mechanism, so that the crushing mechanism without a power device can be arranged, and the installation space is saved.

The sliding bearing preferably adopts a joint bearing, and has the advantages of high load capacity, impact resistance, corrosion resistance, wear resistance and self-aligning. The adoption of the joint bearing is helpful for keeping the coaxiality between the front and rear hinged connecting holes and the output end gear of the front stage cutting transmission mechanism and the input end gear of the rear stage cutting transmission mechanism respectively.

In the case of the plain bearing 141, an antifriction layer 1413 is provided between the inner ring 1411 and the outer ring 1412 of the spherical plain bearing to reduce wear of the bearing sliding pair. And the radial outer side of the inner ring and the front end and the rear end of the outer ring are respectively provided with a sealing seat 1414 and a sealing seat 1416, the surface of a radial inner hole of each sealing seat is provided with a sealing groove, and a sealing ring 1415 and a sealing ring 1417 are arranged in each sealing groove. The inner race 1411 is circumferentially fixed to the front pin sleeve by flat keys 1418. By adopting the knuckle bearing, the service life of the sliding pair can be prolonged, and the transmission precision between the front-stage cutting transmission mechanism and the rear-stage cutting transmission mechanism can be improved.

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

For the case of the cylinder inner accommodating cavity, the left and right cylinder inner accommodating cavities are communicated, or a left and right common cylinder inner accommodating cavity 216 is directly provided.

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

Claims (12)

1. The utility model provides a thin seam compact coal-winning machine cutting mechanism which characterized in that: the front main body shell and the rear main body shell are in front-back butt joint and are positioned through a large plane and a plurality of positioning pins and fixed through fasteners, a first ear seat, a second ear seat and a connecting base are sequentially arranged at the right edge or the left edge of the front main body shell from front to back, a front groove is formed between the first ear seat and the second ear seat, a middle groove is formed between the second ear seat and the connecting base, the rear main body shell comprises a rear base body and a third ear seat which is positioned in the front of the middle of the rear base body and overhangs rightwards or leftwards, a rear groove is formed between the third ear seat and the rear base body, a front-stage cutting transmission mechanism and a cutting motor are installed in the front main body shell, the front-stage cutting transmission mechanism comprises an input gear, an idler wheel group and an output gear which are sequentially arranged in the left-right direction and are sequentially in transmission connection, and an output shaft of the front-stage cutting motor is coaxially in transmission connection with the input gear of the cutting transmission mechanism, the output end gear of the preceding stage cutting transmission mechanism is positioned in the connecting base, the main body of the swing arm shell is an arm support extending leftwards and rightwards, a rear stage cutting transmission mechanism is installed in the arm support, the ends of the input end gear and the output end gear of the rear stage cutting transmission mechanism are respectively called as a high-speed end and a low-speed end of the arm support, a connecting arm overhanging forwards from the arm support is arranged in the middle of the arm support, a front arm overhanging leftwards or rightwards from the connecting arm is arranged on the connecting arm, a rear arm is arranged behind the high-speed end of the arm support, one end of the rear arm is a cantilever structure connected onto the arm support, the high-speed end and the rear arm of the front arm, the arm support are respectively embedded into a front groove, a middle groove and a rear groove, the front arm is hinged with a first ear seat and a second ear seat, the rear arm is hinged with a third ear seat and a rear base body, the output end gear of the preceding stage cutting transmission mechanism is coaxially connected with the input end gear of the rear stage cutting transmission mechanism, and the axis of the hinge is coaxial with the hinge axis hinged at the front and the rear parts.

2. The cutting mechanism of the thin coal seam compact shearer of claim 1, wherein: the input end gear core part of the rear-stage cutting transmission mechanism is provided with a rear-stage spline hole, a spline sleeve with an internal spline and an external spline is installed in the rear-stage spline hole, and the spline hole of the spline sleeve and the spline hole of the output end gear core part of the front-stage cutting transmission mechanism are simultaneously connected with one spline shaft spline.

3. The cutting mechanism of the thin coal seam compact shearer of claim 2, wherein: the cantilever end surface of forearm, the high-speed end surface of cantilever crane and the cantilever end surface of postbrachium set to with the coaxial first group evagination circular arc cylinder of two articulated hinge axes in front and back, preceding recess, well recess and back recess set to with the coaxial first group indent circular arc cylinder of two articulated hinge axes in front and back, first group indent circular arc cylinder and first group evagination circular arc cylinder one-to-one and leave the interval each other, all install the sealing washer on the respective front and back terminal surface of forearm, cantilever crane's high-speed end and postbrachium.

4. The cutting mechanism of the thin coal seam compact shearer of claim 2, wherein: a bulge structure protruding backwards is arranged at a position, close to the root of the rear arm, on the arm support, a cavity in the bulge structure is an auxiliary cavity, and the auxiliary cavity is a part of an inner cavity of the arm support.

5. The cutting mechanism of the thin coal seam compact coal mining machine according to claim 2, characterized in that: the connecting arm is provided with an inner cavity and is communicated with the inner cavity of the arm support, and the inner cavity of the connecting arm is internally provided with a reinforced cooler.

6. The cutting mechanism of the thin coal seam compact shearer of claim 2, wherein: the lifting mechanism further comprises a lifting oil cylinder, one end of the lifting oil cylinder is hinged with the lower part of the connecting arm, the other end of the lifting oil cylinder is hinged with the lower part of the front main body part shell, and two hinge axes horizontally extend back and forth.

7. The cutting mechanism of the thin coal seam compact shearer of claim 6, wherein: the lower part of linking arm and the lower part of preceding main part casing are equipped with respectively and control extension, open-down hydro-cylinder and hold the chamber outward and hold the chamber in the hydro-cylinder, and wherein the hydro-cylinder holds the chamber outward and seals in the direction one end, and the other end holds the chamber relative with the hydro-cylinder in, the hydro-cylinder that the hydro-cylinder setting of increaseing held the chamber and constitutes in the hydro-cylinder holds the intracavity outward by the hydro-cylinder.

8. The cutting mechanism of the thin coal seam compact shearer of claim 2, wherein: the left and right width of the middle upper part of the connecting arm is the narrowest, the left and right width of the connecting arm is wider as the connecting arm is closer to the upper end part and the lower end part, the top surface of the connecting arm is an inclined surface, and the top surface of the connecting arm in the left and right directions is higher as the top surface of the connecting arm is closer to the high-speed end of the arm support.

9. The cutting mechanism of the thin coal seam compact coal mining machine according to claim 2, 3, 4, 5, 6, 7 or 8, characterized in that: the front wear-resistant sleeve is installed in the ear hole of the first ear seat and the ear hole of the front portion of the second ear seat respectively, the rear wear-resistant sleeve is installed in the ear hole of the third ear seat and the ear hole of the front portion of the rear base body respectively, the front sliding bearing and the rear sliding bearing are installed in the front hinge connecting hole and the rear hinge connecting hole which participate in the hinge connection on the front arm and the rear arm respectively, the front sliding bearing and the rear sliding bearing are installed in the middle portions of the front pin shaft sleeve and the rear pin shaft sleeve in a sleeved mode respectively, the front portion and the rear portion of the front pin shaft sleeve are in tight fit with the front wear-resistant sleeve, the front portion and the rear portion of the rear pin shaft sleeve are in tight fit with the rear wear-resistant sleeve, the inner hole of the front pin shaft sleeve is communicated with the inner hole of the second ear seat, the limiting rods are installed in the two inner holes, the rear ends of the limiting rods extend into the rear spline holes to axially limit the front end of the spline shaft, the front portion of the limiting rods are fixed in a positioned and fixed mode relative to the front pin shaft sleeve, and the rest portions of the limiting rods are connected with the front pin shaft sleeve, The inner hole of the second ear seat and the rear-stage spline housing are not in contact, a wear-resistant pad is fixedly sleeved on the rear end of the limiting rod, and the limiting rod axially limits the spline shaft by means of the wear-resistant pad.

10. The cutting mechanism of the thin seam compact shearer of claim 9, wherein: the front part and the rear part of an input end gear of the pre-stage cutting transmission mechanism are respectively provided with a spline hole, the spline hole at the front part is in coaxial transmission connection with an output shaft of the cutting motor, and the spline hole at the rear part is in coaxial connection with an input shaft of a gear pump of a hydraulic system.

11. The cutting mechanism of the thin coal seam compact coal mining machine according to claim 9, characterized in that: the front part and the rear part of an output end gear of the pre-stage cutting transmission mechanism are respectively provided with a spline hole, the spline hole at the front part is coaxially connected with the spline shaft, and the spline hole at the rear part is a power output port for outputting power for the crushing mechanism.

12. The cutting mechanism of the thin seam compact shearer of claim 9, wherein: the left and right edges of the front main body shell are respectively provided with the first ear seat, the second ear seat and the connecting base, the rear main body shell is correspondingly provided with the left and right two third ear seats and the rear groove, the left and right two swing arm shells are hinged with the front main body shell and the rear main body shell from the left and right sides, two sets of front-stage cutting transmission mechanisms are arranged in the front main body shell, the two sets of front-stage cutting transmission mechanisms share one input gear, and the number of idler wheels in the idler group of the two sets of front-stage cutting transmission mechanisms is different.

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