CN216841642U - Cutting mechanism of short-span coal mining machine for thin coal seam - Google Patents

Abstract

The utility model relates to a short span coal-winning machine cutting mechanism in thin coal seam, including the cutting motor, swing arm casing and preceding main part casing, the cantilever crane of extension is controlled to the main part of swing arm casing, the cantilever crane middle part is equipped with the linking arm of forward overhang, be equipped with the forearm of left or right overhang on the linking arm, the right edge or the left edge of preceding main part casing are equipped with first by the forward backward in proper order, second ear seat and connection base, the high-speed end of forearm and cantilever crane is first with preceding main part casing, two ear seats and connection base are each other inserted and are formed articulatedly, the cutting motor is as articulated round pin axle, the output shaft of cutting motor is connected with the input gear coaxial drive of the interior cutting drive mechanism of cantilever crane, main part casing and swing arm casing fixed connection and rotation connection before the cutting motor is relative respectively. The utility model discloses can provide great exploitation scope, great cutting power, can also shorten the fuselage, improve coal-winning machine focus problem.

Description

Cutting mechanism of short-span 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, can provide great exploitation scope for the thin seam coal-winning machine.

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 suspension machine body coal mining machine adopts the cutter, the problem that the mining height of the rear roller is too small can occur, because when the mining height is increased again, the cutting motor of the rear rocker arm interferes with an upper coal platform left after the front roller cuts the bottom cutter, so that the overall mining height of the coal mining machine is too narrow, and the coal mining machine cannot meet the mining requirement of large change of the thickness of a mineral layer of a working face of a thin seam in China.

In order to solve the problems, the industry proposes that the cutting part is a swinging part and a fixed part, and the cutting motor and the main body of the cutting transmission system are arranged on the fixed part, so that the structure of the fixed part is too complex, the left and right lengths of the machine body suspension section are too long, the weight is too large, and the gravity center problem of the whole machine still has great influence on the stress of the whole machine. Moreover, the coal mining machine with a long body structure cannot perform a straight-pushing process similar to a short-wall coal mining machine, and the inclined cutting feed at two ends is long in time, so that the mining efficiency is limited to a certain extent.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a short span coal-winning machine cutting mechanism in thin seam can provide great exploitation scope, great cutting power, can also shorten the fuselage, improves coal-winning machine focus problem.

The utility model discloses a main technical scheme has:

a cutting mechanism of a short-span coal mining machine for a thin coal seam comprises a cutting motor, a swing arm shell and a front main body shell, wherein the main body of the swing arm shell is an arm support extending leftwards and rightwards, a cutting transmission mechanism is installed in the arm support and adopts a fixed-shaft gear transmission mechanism, the ends of an input end gear and an output end gear of the cutting transmission mechanism are respectively used as a high-speed end and a low-speed end of the arm support, a connecting arm cantilevered forwards from the arm support is arranged in the middle of the arm support, a front arm cantilevered leftwards or rightwards from the connecting arm is arranged on the connecting arm, a front pin shaft installation hole is formed in the front of the high-speed end of the arm support, a rear pin shaft installation hole is formed in the front of the high-speed end of the arm support, the input end gear is installed in the rear of the high-speed end of the arm support, the front pin shaft installation hole and the rear pin shaft installation hole are coaxial with the input end gear, and a first lug seat is sequentially arranged on the right edge or the left edge of the front body of the front shell from front to back, The cutting motor is installed in a hole formed by combining the ear hole of the first ear seat, the front pin shaft installation hole, the ear hole of the second ear seat and the rear pin shaft installation hole, the output shaft of the cutting motor is coaxially connected with an input end gear of the cutting transmission mechanism, and the cutting motor is fixedly connected and rotatably connected with the front main body part shell and the swing arm shell relatively.

The shell of the cutting motor can be rotatably supported in the front pin shaft mounting hole and the rear pin shaft mounting hole through a bearing.

The shell of the cutting motor adopts a thick-wall structure, the surface of the shell is provided with a first circular convex spigot, a second circular convex spigot and a third circular convex spigot at intervals from front to back in sequence, the rear part of the ear hole of the first ear seat, the front part of the ear hole of the second ear seat and the rear part of the ear hole of the second ear seat are respectively provided with a first circular concave spigot, a second circular concave spigot and a third circular concave spigot, and the first circular convex spigot to the third circular convex spigot and the first circular concave spigot to the third are in one-to-one close fit.

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

The middle part of the arm support is provided with a bulge structure protruding backwards, a cavity inside the bulge structure is an auxiliary cavity, and the auxiliary cavity is a part of an inner cavity of the arm support.

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

The bearing preferably adopts a joint bearing, an antifriction layer is arranged between an inner ring and an outer ring of the joint bearing, two sealing seats are respectively arranged at the radial outer side of the inner ring and the front end and the rear end of the outer ring, sealing grooves are respectively arranged on the surface of a radial inner hole and the outer end surface of each sealing seat, and a sealing ring is arranged in each sealing groove.

The lower part of the connecting arm is also provided with an oil cylinder containing cavity extending left and right and having a downward opening, the oil cylinder containing cavity is positioned below the front arm in the front-back direction, a large part of a heightening oil cylinder is positioned in the oil cylinder containing cavity, one end of the heightening oil cylinder is hinged on the connecting arm, the other end of the heightening oil cylinder is hinged on the front main body shell, the two hinged axes horizontally extend front and back, an oil cylinder outer pin hole is formed in the front cavity wall and the rear cavity wall of the oil cylinder containing cavity, which are close to the low-speed end of the arm support, an oil cylinder inner pin hole is formed in the right end or the left end of the lower part of the front main body shell, and the heightening oil cylinder, the connecting arm and a hinged shaft of the front main body shell are respectively installed in the oil cylinder outer pin hole and the oil cylinder inner pin hole.

The left and right width of the middle upper part of the connecting arm in the height direction is the narrowest, the left and right width 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 preferably, the top surface is higher as the connecting arm is closer to the high-speed end of the arm support in the left and right direction.

The cutting mechanism of the low-coal-seam short-span coal mining machine further comprises a clutch mechanism, the clutch mechanism comprises a mandrel and a clutch device, the clutch device is connected in front of the mandrel, a front spline shaft section is arranged at the front of the mandrel, a rear spline shaft section and a guide shaft section are arranged at the rear of the mandrel, the spline shaft section is located in front of the guide shaft section, gear spline holes and guide holes are formed in the front and the rear of a core part of an input end gear at intervals, a motor spline hole is formed in the front of an output shaft of the cutting motor, when the clutch device is located at the rear limit position, the front spline shaft section and the rear spline shaft section of the mandrel are in spline connection with the motor spline hole and the gear spline hole respectively, the front of the guide shaft section is located in the guide holes, and a radial gap is reserved between the guide shaft section and the guide holes.

The utility model has the advantages that:

the utility model discloses a with the whole round pin axle of swing arm casing and preceding main part casing looks articulated mutually of cutting motor, both shortened length about preceding main part casing, just also equal the length about shortened coal-winning machine and hung the fuselage section, simplified cutting mechanism's structure again.

The front arm is used as a stressed part for playing a main supporting role and is separated from the arm support provided with the cutting transmission mechanism, and the front part of the high-speed end of the arm support is only used as a secondary stressed part for playing an auxiliary supporting role although being a part of the arm support, so that the cutting transmission mechanism can be basically ensured to be in a good non-stressed state, and the transmission precision is ensured.

The cutting transmission mechanism and the rear pin shaft mounting hole for auxiliary supporting of the cutting motor are arranged in the arm support, so that the structure is more compact, the power input connection point of the cutting transmission mechanism and the auxiliary supporting point are closer, the influence of jumping during power transmission is smaller, and the power transmission is more stable and reliable.

The cutting motor and the front main body part are radially fixed by adopting a front group of spigot matching structures and a rear group of spigot matching structures, the front group of spigot matching structures are positioned in front of and behind the front arm and are beneficial to balancing the stress of the front arm, and the rear group of spigot matching structures provide auxiliary stress support for the high-speed end of the arm support. The front and the rear groups of rabbets are matched with each other to balance the stress of the swing arm shell, so that the reliability of the hinged connection between the swing arm shell taking the cutting motor as a pin shaft and the front main body shell can be improved.

The cutting motor is supported on the swing arm shell through the joint bearing, and the joint bearing is adopted to help to keep the concentricity between the front pin shaft mounting hole and the rear pin shaft mounting hole and the shell of the cutting motor, so that the transmission precision between the cutting motor and the cutting transmission mechanism is improved. The 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 two ends of the antifriction layer are sealed, the cleanness of an internal friction pair can be ensured, the inside of the bearing can be kept in a good lubricating condition, and accordingly, the antifriction layer is also beneficial to improving the transmission precision between the cutting motor and the cutting transmission mechanism.

The heightening oil cylinder is arranged below the cutting motor, so that the space between a top plate and a bottom plate of a coal face is fully utilized, the length of the suspended machine body section in the left and right direction is greatly shortened, and the distance between two rollers is shortened for a double-roller coal mining machine. The oil cylinder accommodating cavity is arranged to provide a relatively clean operation space for the swinging and wiring of the heightening oil cylinder, the swinging of the swinging arm shell is not affected by mineral aggregates such as coal, and the maximum mining range is not affected finally.

A radial gap is reserved between the guide shaft section and the guide hole, so that the floating amount of the power transmission structure is increased, and the adaptability of the power transmission structure can be improved.

The connecting arm is also provided with an inner cavity and is communicated with the inner cavity of the arm support, so that the oil storage volume in the shell of the swing arm is increased. Moreover, an intensified cooler is arranged in the inner cavity of the connecting arm and used for intensively cooling the oil cavity so as to improve the cooling effect of the high-power density swing arm.

Because the intermediate gear can transmit part of power to the gear pump, the hydraulic system does not need to be additionally provided with an independent power source.

The arrangement of the auxiliary cavity not only increases the oil cavity of the arm support, but also increases the shell strength of the arm support.

Drawings

Fig. 1 is a front 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 front view of the assembly of the swing arm housing of FIG. 1 with the drum and cutting drive mechanism mounted thereon;

FIG. 4 is a top cross-sectional view of FIG. 3;

FIG. 5 is a schematic view of an embodiment of a cutting motor;

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

fig. 7 is a schematic view of a double-rocker thin seam coal mining machine employing the cutting mechanism of the present invention;

fig. 8 is a schematic top view of the structure of fig. 7.

Reference numerals are as follows:

11. a swing arm housing; 111. a forearm; 1111. the outer surface of the overhanging end of the forearm; 112. the front part of the high-speed end of the arm support; 113. the back part 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; 1142. the side surface is close to the low-speed end of the arm support; 1144. an oil cylinder accommodating cavity; 1147. the top surface of the oil cylinder accommodating cavity; 115. an auxiliary chamber; 12. a cutting transmission mechanism; 121. an input end gear; 122. a planetary reduction mechanism; 123. an intermediate gear; 13. a drum; 14. a bearing; 15. a mandrel; 16. an intensive cooler; 17. a gear pump;

2. a front body section case; 211. a first circular female spigot; 212. a second circular female spigot; 213. a third circular female spigot; 214. a front groove; 215. a larger diameter groove; 216. a smaller diameter groove; 217. the outer surface of the overhanging end of the first ear mount;

3. a cutting motor; 31. a first circular male end; 32. a second circular male end; 33. a third circular male end; 34. an annular end face; 35. a front journal; 36. a rear journal;

4. and (5) heightening the oil cylinder.

Detailed Description

The utility model discloses a short span coal-winning machine cutting mechanism in thin seam (can be referred to as cutting mechanism for short), as shown in fig. 1-8, including cutting motor 3, swing arm casing 11 and preceding main part casing 2, the cantilever crane of extension is about to swing arm casing's main part, installs cutting drive mechanism 12 in the cantilever crane. The cutting transmission mechanism adopts a fixed-shaft gear transmission mechanism. In order to distinguish the two ends of the arm support conveniently, the ends of the input end gear 121 (also a high-speed end gear) and the output end gear (also a low-speed end gear) of the cutting transmission mechanism are respectively used as the high-speed end and the low-speed end of the arm support. 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 front arm is provided with a front pin shaft mounting hole, the front part 112 of the high-speed end of the arm support is provided with a rear pin shaft mounting hole, the input end gear is mounted at the rear part 113 of the high-speed end of the arm support, and the front pin shaft mounting hole and the rear pin shaft mounting hole are coaxial with the input end gear. The front pin shaft mounting hole and the rear pin shaft mounting hole are used for mounting the cutting motor 3, and the front pin shaft mounting hole and the rear pin shaft mounting hole are coaxial with the input end gear, so that the mounted cutting motor and the input end gear can transmit power coaxially. The right edge or the left edge of the front main body part shell is sequentially provided with a first ear seat extending leftwards or rightwards, a second ear seat and a connecting base from front to back, a front groove 214 is formed between the first ear seat and the second ear seat, a rear groove is formed between the second ear seat and the connecting base, the high-speed ends of the front arm and the arm support are correspondingly inserted into the front groove and the rear groove respectively, the cutting motor is installed in an inner hole formed by combining an ear hole of the first ear seat, a front pin shaft installation hole, an ear hole of the second ear seat and a rear pin shaft installation hole, and an output shaft of the cutting motor is in coaxial transmission connection with an input end gear 121 of the cutting transmission mechanism. The cutting motor is fixedly connected and rotatably connected with the front main body part shell and the swing arm shell respectively, and the swing arm shell is hinged with the front main body part shell by taking the cutting motor as a pin shaft. The cutting motor is integrally used as the pin shaft, so that the left and right length of the shell of the front main body part is shortened, the left and right length of the suspended machine body section of the coal mining machine is shortened, and the structure of the cutting mechanism is simplified. The related structures such as the winding and the rotor inside the cutting motor can still adopt the conventional structure.

The housing of the cutting motor is rotatably supported in the front pin shaft mounting hole and the rear pin shaft mounting hole through a bearing 14. Most of the load at the hinged part is borne by the bearing, so that the swing arm shell, the front main body part shell and the cutting motor can be well protected from being influenced or less influenced, and the connection reliability is kept.

The shell of the cutting motor is of a thick-wall structure, and a first circular convex spigot 31, a second circular convex spigot 32 and a third circular convex spigot 33 are sequentially arranged on the surface of the shell from front to back at intervals. The rear part of the ear hole of the first ear seat, the front part of the ear hole of the second ear seat and the rear part of the ear hole of the second ear seat are respectively provided with a first circular concave spigot 211, a second circular concave spigot 212 and a third circular concave spigot 213, and the first to third circular convex spigots and the first to third circular concave spigots are in one-to-one corresponding tight fit. The first round convex spigot and the second round concave spigot form a front group of spigot matching structure, and the third round convex spigot and the third round concave spigot form a rear group of spigot matching structure. The front group of seam allowance matching structures are positioned in front and at the back of the front arm, and are helpful for balancing the stress of the front arm. The latter group of spigot matching structures provide auxiliary stress support for the high-speed end of the arm support. The front and the rear groups of rabbets are matched with each other to balance the stress of the swing arm shell, so that the reliability of the hinged connection between the swing arm shell taking the cutting motor as a pin shaft and the front main body shell can be improved. The front journal 35 for mounting the front bearing on the housing of the cutting motor is located between the first and second circular male spigots and the rear journal 36 for mounting the rear bearing is located behind the third circular male spigot. An annular end face 34 is arranged between the rear journal 36 and the third circular male spigot 33, and the annular end face participates in end face sealing between the cutting motor and the arm support.

Furthermore, the outer cylindrical surfaces of the first to third circular convex spigot are provided with sealing grooves, and sealing rings are arranged in the sealing grooves.

The shearer drum 13 and the planetary reduction mechanism 122 are both mounted at the low speed end of the boom, with the planetary reduction mechanism located in the core of the drum. The planetary reduction mechanism bears most of the reduction work, so that the cutting transmission mechanism serving as the preceding reduction part can meet the reduction requirement by adopting a relatively simple fixed-shaft gear transmission mechanism, and accordingly the appearance of the arm support for accommodating the cutting transmission mechanism is more regular.

The external load force applied to the roller is transmitted to the front main body shell through the connecting arm, the front arm and the front part of the high-speed end of the arm support. The front arm is used as a stressed part for main supporting and is separated from the arm support provided with the cutting transmission mechanism, and the front part of the high-speed end of the arm support is only used as a secondary stressed part for auxiliary supporting although being a part of the arm support, so that the cutting transmission mechanism can be basically ensured to be in a good non-stressed state, and the transmission precision is ensured.

The cutting transmission mechanism and the rear pin shaft mounting hole for auxiliary supporting of the cutting motor are arranged in the arm support, so that the structure is more compact, the power input connection point of the cutting transmission mechanism and the auxiliary supporting point are closer, the influence of jumping during power transmission is smaller, and the power transmission is more stable and reliable.

The connecting arm is provided with an inner cavity and is communicated with the inner cavity of the arm support, and the inner cavity provided with the connecting arm increases the oil storage volume in the shell of the swing arm. And a strengthening cooler 16 is arranged in the inner cavity of the connecting arm and used for strengthening a cooling oil cavity so as to improve the cooling effect of the high-power density swing arm.

The middle part of the arm support is provided with a bulge structure protruding backwards, a cavity inside the bulge structure is an auxiliary cavity 115, and the auxiliary cavity is a part of an inner cavity of the arm support, so that not only is the oil cavity of the arm support increased, but also the shell strength of the arm support is increased.

The cutting transmission mechanism comprises an input end gear 121, a first idler gear set, a middle gear 123, a second idler gear set and an output end gear which are in transmission connection in sequence. One or more idler pulleys of each of the first and second idler pulley sets may be provided. A first reduction is effected from the input gear to the intermediate gear and a second reduction is effected from the intermediate gear to the output gear. A gear pump 17 is also arranged in the inner cavity of the arm support, and the intermediate gear is coaxially and fixedly connected with the gear pump. The gear pump is the power source of hydraulic system, because the intermediate gear has given partial power transmission to the gear pump, therefore hydraulic system need not set up independent power source in addition.

The bearing adopts a joint bearing, and has the advantages of high load capacity, impact resistance, corrosion resistance, wear resistance and self-aligning. The adoption of the joint bearing is helpful for keeping the concentricity between the front pin shaft mounting hole and the rear pin shaft mounting hole and the shell of the cutting motor respectively.

And an antifriction layer is arranged between the inner ring and the outer ring of the joint bearing so as to reduce the abrasion of the bearing sliding pair. And sealing seats are respectively arranged at the radial outer side of the inner ring and the front end and the rear end of the outer ring, sealing grooves are respectively arranged on the radial inner hole surface and the outer end surface of each sealing seat, and sealing rings are arranged in the sealing grooves. By adopting the joint bearing, the service life of the sliding pair can be prolonged, and the transmission precision between the cutting motor and the cutting transmission mechanism can be improved.

The lower part of the connecting arm is provided with a left-right extending oil cylinder accommodating cavity 1144 with a downward opening, and the oil cylinder accommodating cavity is positioned below the front arm in the front-rear direction. The large part of a heightening oil cylinder 4 is positioned in the oil cylinder accommodating cavity, one end of the heightening oil cylinder is hinged on the connecting arm, the other end of the heightening oil cylinder is hinged on the front main body part shell, and the two hinged axes horizontally extend back and forth. 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.

The front width and the rear width of the oil cylinder accommodating cavity are slightly wider than the diameter of the cylinder barrel of the height-adjusting oil cylinder. The middle top surface 1147 of the oil cylinder accommodating cavity is an inwards concave arc cylindrical surface extending from left to right of a straight bus, and the space above the cylinder barrel of the heightening oil cylinder and below the middle top surface 1147 of the oil cylinder accommodating cavity are relatively closed and can be used for laying pipelines of the oil cylinder.

An elastic body can be embedded between the top surface of the middle part of the oil cylinder accommodating cavity and the cylinder barrel of the height-adjustable oil cylinder, and the elastic body can be made of high-elasticity sponge and other materials. The top surface and the bottom surface of elastomer respectively with the hydro-cylinder hold the middle part top surface in chamber and the cylinder surface laminating of heightening the hydro-cylinder, make the elastomer be full of the space of hydro-cylinder top surface below that hydro-cylinder top, hydro-cylinder hold the chamber, can prevent that the buggy from getting into the hydro-cylinder from the hydro-cylinder top and holding the chamber.

Furthermore, the top surface of the end part of the oil cylinder accommodating cavity, which is close to the low-speed end of the arm support, is an inward concave arc cylindrical surface extending from front to back of a straight bus, and the top surface of the end part is covered above a hinged lug of the heightening oil cylinder, which is close to the low-speed end of the arm support, and is almost attached to the outer surface of the hinged lug, so that the outer end of the oil cylinder accommodating cavity is sealed to a certain extent, and pulverized coal is prevented from entering the oil cylinder accommodating cavity from the outer end of the oil cylinder accommodating cavity. The space above the oil cylinder accommodating cavity, particularly the cylinder barrel, is relatively closed by combining the arrangement of the elastic bodies, so that the coal dust can be effectively prevented from entering the oil cylinder accommodating cavity, and the oil cylinder accommodating cavity is ensured to be kept in a relatively clean state.

The oil cylinder accommodating cavity provides a relatively clean operation space for the heightening oil cylinder, the swing arm shell is guaranteed not to be influenced by mineral aggregates such as coal in the swing process, and finally the maximum mining range is guaranteed not to be influenced.

An oil cylinder outer pin hole is formed in the wall of the front cavity wall and the rear cavity wall of the oil cylinder accommodating cavity, which are close to the low-speed end of the arm support, an oil cylinder inner pin hole is formed in the right end or the left end of the lower portion of the front main body part shell, and an articulated shaft for hinging the heightening oil cylinder, the connecting arm and the front main body part shell is respectively installed in the oil cylinder outer pin hole and the oil cylinder inner pin hole. The front and back width of the oil cylinder accommodating cavity is slightly wider than the diameter of the cylinder barrel of the heightening oil cylinder. The space above the cylinder barrel of the heightening cylinder and below the top surface 1147 of the cylinder accommodating cavity is relatively closed, and the heightening cylinder can be used for arranging pipelines of the cylinder.

The left and right width of the middle upper part of the connecting arm in the height direction is the narrowest, the left and right width is wider as the connecting arm is closer to the upper end part and the lower end part, and particularly the lower part of the connecting arm is wider, so that the oil cylinder accommodating cavity is formed. The whole connecting arm is of a flat and thin structure. The narrowest part of the left and right width is preferably as high as the mounting hole of the front pin shaft. The top surface of the connecting arm is an inclined surface, and the end, which is closer to the high-speed end of the arm support, in the left-right direction is higher. The above-mentioned flat thin structure and the special inclined plane structure of the said linking arm, make the swing arm shell swing up and down basically not produce the influence to the coal platform above, therefore can guarantee to obtain the large mining area.

The cutting mechanism of the low-coal-seam short-span coal mining machine further comprises a clutch mechanism, wherein the clutch mechanism comprises a mandrel 15 and a clutch device, and the clutch device is connected in front of the mandrel. The front part of the mandrel is provided with a front spline shaft section, the rear part of the mandrel is provided with a rear spline shaft section and a guide shaft section, and the spline shaft section is positioned in front of the guide shaft section. The core part of the input end gear is provided with a gear spline hole and a guide hole at intervals in the front and at the back. The front part of the output shaft of the cutting motor is provided with a motor spline hole. When the clutch mechanism is located at the rear limit position (namely, the 'closed' position), the front spline shaft section and the rear spline shaft section of the mandrel are in spline connection with the motor spline hole and the gear spline hole respectively, the front part of the guide shaft section is located in the guide hole, and a radial gap is reserved between the guide shaft section and the guide hole. When the clutch device is pulled out forwards, the rear spline shaft section of the mandrel is disengaged from the spline hole of the gear, the rear part of the guide shaft section is positioned in the guide hole, and the front spline shaft section of the mandrel is partially disengaged from the spline hole of the motor. A radial gap is reserved between the guide shaft section and the guide hole, so that the floating amount of the power transmission structure is increased, and the adaptability of the power transmission structure can be improved.

The outer surface 1111 of the overhanging end of the front arm and the outer surface of the high-speed end of the arm support are arranged into a first group of convex arc cylindrical surfaces which are coaxial with the front pin shaft mounting hole, the front groove and the rear groove are arranged into a first group of concave arc cylindrical surfaces which are coaxial with the front pin shaft mounting hole, and the first group of concave arc cylindrical surfaces and the first group of convex arc cylindrical surfaces are coaxial and are spaced from each other; the side surface 1141, close to the high-speed end of the arm support, of the connecting arm is provided with a second group of inner concave arc cylindrical surfaces coaxial with the front pin shaft mounting hole, the outer surface 217 of the overhanging end of the first lug seat and the outer surface of the overhanging end of the second lug seat are provided with a second group of outer convex arc cylindrical surfaces coaxial with the front pin shaft mounting hole, and the second group of outer convex arc cylindrical surfaces and the second group of inner concave arc cylindrical surfaces are coaxial and are spaced with each other. By controlling the size of the corresponding interval within a proper range, the coal rock can be effectively controlled to be accumulated between the swing arm shell and the front main body part shell in the swinging process of the swing arm shell relative to the front main body part shell.

The rear recess is a stepped slot with a larger diameter slot 215 for receiving the front of the high speed end of the boom and a smaller diameter slot 216 for receiving the rear of the high speed end of the boom. Correspondingly, the outer surface of the high-speed end of the arm support is also provided with a step shape.

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

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

Claims (10)

1. The utility model provides a cutting mechanism of short span coal-winning machine in thin seam which characterized in that: the cutting mechanism adopts a fixed shaft gear transmission mechanism, the ends of an input end gear and an output end gear of the cutting transmission mechanism are respectively used as a high-speed end and a low-speed end of the arm support, a connecting arm which is cantilevered forwards from the arm support is arranged in the middle of the arm support, a front arm which is cantilevered leftwards or rightwards from the connecting arm is arranged on the connecting arm, a front pin shaft mounting hole is arranged on the front arm, a rear pin shaft mounting hole is arranged at the front part of the high-speed end of the arm support, the input end gear is arranged at the rear part of the high-speed end of the arm support, the front pin shaft mounting hole and the rear pin shaft mounting hole are coaxial with the input end gear, a first ear seat, a second ear seat and a connecting base are sequentially arranged from front to back at the right edge or the left edge of the front main body part shell, and a front groove is formed between the first ear seat and the second ear seat, a rear groove is formed between the second ear seat and the connecting base, the high-speed ends of the front arm and the arm support are correspondingly inserted into the front groove and the rear groove respectively, the cutting motor is installed in an inner hole formed by combining the ear hole of the first ear seat, the front pin shaft installation hole, the ear hole of the second ear seat and the rear pin shaft installation hole, the output shaft of the cutting motor is coaxially connected with an input gear of the cutting transmission mechanism in a transmission manner, and the cutting motor is fixedly connected and rotatably connected with the front main body part shell and the swing arm shell respectively.

2. The cutting mechanism of the short-span coal mining machine for low coal seams as claimed in claim 1, wherein: the shell of the cutting motor is rotatably supported in the front pin shaft mounting hole and the rear pin shaft mounting hole through a bearing.

3. The cutting mechanism of the short-span coal mining machine for low coal seams as claimed in claim 2, wherein: the shell of the cutting motor adopts a thick-wall structure, the surface of the shell is provided with a first circular convex spigot, a second circular convex spigot and a third circular convex spigot at intervals from front to back in sequence, the rear part of the ear hole of the first ear seat, the front part of the ear hole of the second ear seat and the rear part of the ear hole of the second ear seat are respectively provided with a first circular concave spigot, a second circular concave spigot and a third circular concave spigot, and the first circular convex spigot to the third circular convex spigot and the first circular concave spigot to the third are in one-to-one close fit.

4. The cutting mechanism of the short-span coal mining machine for low coal seams as claimed in claim 2, wherein: 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.

5. The cutting mechanism of the short-span coal mining machine for low coal seams as claimed in claim 2, wherein: the middle part of the arm support is provided with a bulge structure protruding backwards, a cavity inside the bulge structure is an auxiliary cavity, and the auxiliary cavity is a part of an inner cavity of the arm support.

6. The cutting mechanism of the short-span coal mining machine for low coal seams as claimed in claim 2, wherein: the cutting transmission mechanism comprises an input end gear, a first idler gear set, an intermediate gear, a second idler gear set and an output end gear which are sequentially connected in a transmission manner, a gear pump is further arranged in an inner cavity of the arm support, and the intermediate gear is coaxially and fixedly connected with the gear pump.

7. The cutting mechanism of the short-span coal mining machine for low coal seams as claimed in claim 2, wherein: the bearing adopts a joint bearing, an antifriction layer is arranged between an inner ring and an outer ring of the joint bearing, two sealing seats are respectively arranged at the radial outer side of the inner ring and the front end and the rear end of the outer ring, sealing grooves are respectively arranged on the surface of a radial inner hole and the outer end surface of each sealing seat, and a sealing ring is arranged in each sealing groove.

8. The cutting mechanism of the low-seam short-span shearer loader according to claim 1, 2, 3, 4, 5, 6 or 7, characterized in that: the lower part of the connecting arm is provided with an oil cylinder containing cavity extending left and right and having a downward opening, the oil cylinder containing cavity is positioned below the front arm in the front-back direction, a large part of a heightening oil cylinder is positioned in the oil cylinder containing cavity, one end of the heightening oil cylinder is hinged on the connecting arm, the other end of the heightening oil cylinder is hinged on the front main body shell, the two hinged axes horizontally extend front and back, an oil cylinder outer pin hole is formed in the front cavity wall and the back cavity wall of the oil cylinder containing cavity, which are close to the low-speed end of the arm support, an oil cylinder inner pin hole is formed in the right end or the left end of the lower part of the front main body shell, and the heightening oil cylinder, the connecting arm and a hinged hinge shaft of the front main body shell are respectively installed in the oil cylinder outer pin hole and the oil cylinder inner pin hole.

9. The cutting mechanism of the low seam short-span shearer loader according to claim 8, characterized in that: the left and right width of the middle upper part of the connecting arm in the height direction 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 end, closer to the high-speed end of the arm support, in the left and right direction is higher.

10. The cutting mechanism of the short-span shearer loader for thin coal seams as claimed in claim 8, wherein: the front part of the output shaft of the cutting motor is provided with a motor spline hole, when the clutch device is positioned at the rear limit position, the front spline shaft section and the rear spline shaft section of the mandrel are in spline connection with the motor spline hole and the gear spline hole respectively, the front part of the guide shaft section is positioned in the guide hole, and a radial gap is reserved between the guide shaft section and the guide hole.

Images