Single motor double cutting system thin seam coal mining machine

Abstract

The present invention relates to a single-motor dual-cutting system thin-coal seam coal mining machine, comprising a cutting system, a machine body, a guide device, a drag connection device and a support shoe. The root of the motorless rocker arm of the cutting system is rotatably supported in a stationary housing of a non-swinging transmission part. The single cutting motor, two sets of large gears and planetary mechanisms of the cutting system and other large and medium-sized parts do not change position with the swing of the rocker arm. The stationary housing is fixed to the machine body and located in front of the machine body. The two constitute the basic frame of the coal mining machine. The guide device and the support shoe are both installed on the basic frame. The two support the rear and middle parts of the basic frame from below respectively. The machine body is connected to the drag chain of the scraper conveyor in a floating manner through the drag connection device. The present invention can solve the structural layout problem of a short-body high-power thin-coal seam coal mining machine for extremely thin or thin coal seam working faces with complex conditions such as low mining height and high coal rock hardness.

Description

Technical Field

[0001] The invention relates to a thin coal seam coal mining machine, which is particularly suitable for mining extremely thin or thin coal seam working faces with complex conditions such as low mining height and high coal rock hardness. Background Art

[0002] For the mining of thin or very thin coal seams, the mining height is often low (some mining heights reach the required 0.8m), and the geological conditions are complex (such as the coexistence of coal and rock, high hardness), etc. Therefore, in order to improve the reliability of the coal mining machine, while requiring the thin coal seam coal mining machine to be short enough, the installed power is required to be larger and larger to improve its adaptability. However, as the power increases, the size of the motor, transmission system, etc. also increases accordingly. When mining thin coal seams, the coal mining face is usually small. If the outer size of the coal mining machine is too large, the outer space of the coal mining machine is compressed, such as the clearance and coal height, which will seriously affect the passage and loading of the coal mining machine. Therefore, the increase in installed power makes the already difficult structural layout of the thin or very thin coal seam coal mining machine more prominent.

[0003] The industry has proposed and gradually used a technical solution to move large and medium-sized parts such as motors and transmission gears from the top of the original scraper conveyor to the side close to the coal wall, that is, to solve the layout problem of large and medium-sized parts by using a suspended fuselage. This method can be used for coal mining machines in thinner coal seams, but it still cannot meet the mining needs of extremely thin or thin coal seams. In addition, although this method can improve the structural layout problem to a certain extent, such as helping to increase the clearance between the machines, it also brings other prominent problems, such as the high structural height of the coal mining machine arranged between the left and right rollers close to the coal wall, the large span between the rollers, the poor adaptability of the rollers to the mining height, the high height of the coal mining machine face under the bracket, the small coal passing space above the scraper conveyor, and the poor adaptability to the undulating working surface. Summary of the invention

[0004] The present invention aims to provide a single-motor dual-cutting system thin coal seam coal mining machine to solve the structural layout problem of a short-body high-power thin coal seam coal mining machine for extremely thin or thin coal seam working faces with complex conditions such as low mining height and high coal rock hardness.

[0005] The main technical solutions of the present invention are:

[0006] A single-motor dual-cutting system thin coal seam coal mining machine, including a cutting system, a machine body, a guide device, a drag connection device and a supporting slide shoe, the cutting system includes a non-swinging transmission part, a motor-free rocker arm, a cutting motor and a cylinder, the non-swinging transmission part includes a stationary shell and two left and right sets of front-stage transmission systems arranged in the stationary shell, there are two motor-free rockers on the left and right, both of which include a rocker arm shell and a rear-stage transmission system arranged in the rocker arm shell, a motor mounting cavity is provided in the middle position of the stationary shell, and left and right rocker arm mounting cavities are respectively provided at the left and right ends, a cutting motor is fixedly installed in the motor mounting cavity, the roots of the rocker arm shells of the left and right motor-free rockers are respectively rotatably supported in the left and right rocker arm mounting cavities, and the output shaft of the cutting motor passes through the front-stage transmission systems on the left and right sides and the rear-stage transmission systems on the corresponding sides. The transmission system is connected, and the input end of the rear-stage transmission system is provided with a large gear and a planetary mechanism which are coaxially connected in sequence. The large gear and the planetary mechanism are arranged in the chamber at the root of the corresponding rocker arm housing, and the axis of the large gear is coaxial with the rotation center of the root of the rocker arm housing. Each motorless rocker arm corresponds to one cylinder, and the two ends of the cylinder are respectively hinged to the stationary housing and the corresponding rocker arm housing. The axis of the large gear and the hinge axis at both ends of the cylinder extend in the front and rear directions. The stationary housing is fixed on the fuselage and is located in front of the fuselage. The two constitute the basic frame of the coal mining machine. The guide device and the supporting sliding shoe are both installed on the basic frame. The two respectively support the rear and middle parts of the basic frame from below, and the fuselage is floatingly connected with the drag chain of the scraper conveyor through the drag connection device.

[0007] The output end of the front-stage transmission system adopts a small gear and an intermediate gear group that mesh with each other externally, and the intermediate gear group is externally meshed with the large gear. The intermediate gear group includes an eccentric shaft, an eccentric sleeve, a bearing and an intermediate gear. The eccentric shaft includes a reference shaft section located at both ends and an eccentric shaft section located in the middle. An outer eccentric groove and an inner eccentric groove extending in the axial direction and closed at both ends are respectively provided on the surface of the eccentric shaft section at the positions farthest and closest to the axis of the reference shaft section. A key groove extending in the axial direction and not closed at both ends is provided at the thickest part of the hole wall of the eccentric sleeve. The eccentric sleeve is sleeved on the eccentric shaft The keyway is matched with the outer eccentric groove or the inner eccentric groove and forms a key connection with the key between the eccentric shaft and the eccentric sleeve. The reference shaft sections at both ends of the eccentric shaft are fixed on the stationary housing. The intermediate gear is mounted on the outer cylindrical surface of the eccentric sleeve through the bearing. The intermediate gear is located between the pinion and the large gear and meshes with them respectively. The axes of the pinion, the intermediate gear and the large gear are located in the same plane. The eccentric shaft has two optional installation positions, which are the positions where the outer eccentric groove and the inner eccentric groove are closest to the axis of the large gear.

[0008] A shell slot is provided on the common side wall between the rocker arm mounting cavity and other adjacent cavities on the stationary shell, and a rocker arm shell notch is provided on the root side wall of the rocker arm shell. In the installed state, the rocker arm shell notch always maintains a partial overlapping area with the shell slot in the circumferential direction, and the intermediate gear set and the large gear remain meshed in the overlapping area of ​​the shell slot and the rocker arm shell notch.

[0009] A bearing seat is also fixed on the inner wall of the chamber at the root of the rocker arm housing near the large gear. The input end shaft diameter of the large gear is supported on the inner wall of the bearing seat through a bearing. A bearing seat notch is provided on the side wall of the bearing seat. The circumferential position and size of the bearing seat notch are preferably consistent with the notch of the rocker arm housing.

[0010] The stationary shell is provided with guard plates on the left and right sides respectively. The stationary shell, the left and right rocker arm shells and the guard plates on the corresponding sides together form a closed cavity on the left and right sides respectively. The left and right oil cylinders are respectively located in the two closed cavities on the left and right sides.

[0011] The cutting system also includes two left and right hydraulic systems. The rear spaces of the left and right front-stage transmission systems in the stationary shell are each configured as an oil tank, and the left and right hydraulic systems are respectively installed in the left and right oil tanks. A transmission shaft in the front-stage transmission system replaces the pump motor of the hydraulic system on the corresponding side to provide power for the hydraulic system, and the hydraulic pressure output by the hydraulic system serves as the hydraulic driving force of the oil cylinder on the corresponding side.

[0012] The fuselage is a solid fuselage without internal transmission. Most of the top surface of the fuselage is arranged as an inclined surface with a high front and a low back, and the middle front part of the bottom surface of the fuselage is arranged as an inwardly concave surface.

[0013] The single-motor dual-cutting system thin coal seam mining machine preferably also includes an auxiliary support device, which supports the front of the basic frame from below, and the auxiliary support device includes a single-rod piston cylinder and an auxiliary sliding shoe. The single-rod piston cylinder is vertically installed in the basic frame and is located directly above the auxiliary sliding shoe. The downwardly extending end of the piston rod is hinged to the upper part of the auxiliary sliding shoe, and the hinge axis extends in the front-to-back direction.

[0014] The guide device includes a guide shoe and a swivel pin. The upper part of the guide shoe is hinged to the fuselage by passing the swivel pin. The hinge axis extends forward and backward. The pin hole on the guide shoe through which the swivel pin is passed is a waist-shaped hole with a left and right width greater than the upper and lower widths. The front side and the rear side of the guide shoe are both smooth transition surfaces with the middle part close to the outside and the left and right ends close to the inside.

[0015] The guide shoe preferably includes a front shoe, a rear shoe and a pin. The front shoe and the rear shoe are arranged in close contact with each other in front and back, and the contact surface is positioned by the pin. The front shoe, the rear shoe and the pin are fastened and connected by screws passed through them in the front and back directions. There are multiple pins, which are arranged at intervals on the left and right.

[0016] The upper part of the supporting shoe is hinged to the fuselage, and the hinge axis extends forward and backward. The bottom of the supporting shoe is provided with two supporting surfaces, one in front and one in the back, which are the second supporting surface and the first supporting surface respectively. The first supporting surface is higher than the second supporting surface. Both the first supporting surface and the second supporting surface are provided with a wear-resistant layer.

[0017] The drag connection device may include a connecting plate and a connecting hook, one end of the connecting plate is hinged to the fuselage through an upper connecting pin, the diameter of the pin hole on the connecting plate for passing the upper connecting pin is larger than the upper connecting pin, the other end of the connecting plate is hinged to one end of the connecting hook through a lower connecting pin, the hinge axes of these two hinges are extended left and right, the other end of the connecting hook is arranged as a cylindrical structure with an axis extending left and right, the cylindrical structure is arranged in the chain groove of the scraper conveyor, and is slidably connected to the chain groove, and both ends of the cylindrical structure are connected to a drag chain.

[0018] The beneficial effects of the present invention are:

[0019] The present invention adopts a cutting system with a brand-new structure, in which the swinging transmission part is allowed to swing on a fixed axis relative to the non-swinging transmission part, and large and medium-sized components such as the cutting motor, planetary mechanism, and large gear are placed in the shell of the non-swinging transmission part. When the swinging transmission part rotates, the positions of the large and medium-sized components remain unchanged. Therefore, the front drum bottom knife cuts out a channel for the suspended body and the rear drum top knife cuts off the remaining coal platform, which will not be affected by the large and medium-sized components. Therefore, the rocker arm shell will not interfere with the coal platform, which not only realizes the suspended body layout and reduces the height of the coal mining machine body, but also ensures the proper mining height range.

[0020] The present invention arranges large and medium-sized parts of the coal mining machine in area C close to the coal wall, arranges small and medium-sized parts of the coal mining machine in area B, and arranges small-sized parts or short-sized parts in area A below the thick beam of the support, thereby ensuring that the overall structure of the short-body, high-power, thin-coal seam coal mining machine can be smoothly arranged under low mining height conditions, and maintaining sufficient gaps between the coal mining machine and the support, and between the coal mining machine and the scraper conveyor, thereby meeting the mining needs of undulating roofs and floors, coal gangue, etc., and ensuring the smooth mining of extremely thin or thin coal seams under complex conditions such as the coexistence of coal and rock.

[0021] The present invention arranges the top surface of the fuselage located below the top beam of the support to be an inclined surface which is higher in the front and lower in the rear, and arranges the bottom surface in the middle of the fuselage to be a concave surface which is concave in the middle in the front-to-back direction, so that sufficient space is maintained between the fuselage and the top beam and the scraper conveyor chute, thereby improving the adaptability of the thin coal seam coal mining machine to working surfaces with undulating conditions.

[0022] The cutting system of the present invention adopts a gear speed change mechanism with an eccentric shaft and an eccentric sleeve as the core. By changing the installation direction of the eccentric shaft and the eccentric sleeve and replacing the large gear and the small gear of different sizes, a wide range of speed changes can be achieved. By matching rollers of different specifications, more choices can be made for parameters such as cutting force and cutting line speed, thereby adapting to the mining of coal, rock and other materials with different hardness.

[0023] The present invention utilizes the stationary shell, the rocker arm shell and the guard plate to jointly form a closed cavity, providing a good external working environment for the oil cylinder, avoiding the adverse effects of coal powder, gangue and the like on the oil cylinder, making the oil cylinder more reliably retractable and having a longer service life, thereby providing more reliable and high-quality support for the rotation of the rocker arm relative to the non-swinging transmission part.

[0024] The present invention draws out a branch from the non-swinging transmission part to replace the pump motor to provide power for the pump group of the hydraulic system. Since the power of the cutting motor is much greater than the power of the pump motor, even if the power demand of the hydraulic system is large, it does not need to occupy a larger installation space like the traditional pump group due to the need to be equipped with a larger power pump motor. Therefore, the hydraulic system has a compact structure and has surplus power.

[0025] The present invention makes full use of the idle space in the stationary housing of the non-swinging transmission part as an oil tank of the hydraulic system, and uses it to install the hydraulic system, so that the coal mining machine structure is more compact, and neither the machine surface height nor the span of the roller is increased.

[0026] The present invention arranges a support shoe at the lower middle part of the front-back direction of the basic frame composed of the machine body and the stationary shell, and arranges a guide device and a drag connection device at the lower rear part, and uses the support shoe and the guide device to maintain the stability of the coal mining machine, and at the same time, the guide device maintains the sliding cooperation with the track for normal guidance, thereby ensuring the normal movement of the coal mining machine. By combining the guide device with the drag connection device and floatingly connecting the drag connection device with the machine body, the guide device bears the cutting reaction force of the coal mining machine, and the drag connection device only bears the drag force in the left and right directions, so that the wear at the chain groove is greatly reduced, and the service life of the drag connection device can also be greatly improved.

[0027] The present invention adopts a supporting sliding shoe with double supporting surfaces, which not only increases the contact surface exponentially, but also the second supporting surface can move the supporting position toward the coal wall, greatly improving the stability of the suspended body coal mining machine.

[0028] The present invention uses an auxiliary support device to maintain a certain hydraulic pressure in real time through hydraulic oil supply. When the bottom plate fluctuates, coal gangue and other situations that affect stability occur, the hydraulic pressure is supplemented or released by controlling the piston rod to automatically extend and retract according to the detected actual hydraulic pressure changes, so that the hydraulic pressure returns to the set value, thereby maintaining the basic constant support force. Since a certain auxiliary support force can be provided in real time, the force on the support shoe can be reduced. In particular, when the drum rotates inward and the cutting reaction force exerts additional force on the machine body, the force on the support shoe can be greatly improved, the wear can be reduced, and the service life can be increased.

[0029] According to the structural layout characteristics of the suspended fuselage method, the present invention respectively arranges supporting sliding shoes as fixed main supports, guide devices as fixed auxiliary supports, and auxiliary support devices as floating supports at several different specific positions in the direction of the fuselage center of gravity offset. They can not only cooperate with each other, but also maximize the structural advantages of each structure, thereby significantly improving the overall stability of the coal mining machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A horizontal cross-sectional view of an embodiment of the present invention;

[0031] Figure 2 for Figure 1 A front view (left and right sides) of the cutting system;

[0032] Figure 3 for Figure 1 A partial cross-sectional view of the cutting system in (center and left);

[0033] Figure 4 for Figure 1 a longitudinal cross-sectional view of the illustrated embodiment;

[0034] Figure 5 for Figure 3 A schematic diagram of the structure of the motorless rocker arm;

[0035] Figure 6 for Figure 5 A partial cross-sectional view of the notch of the rocker arm housing and the notch of the bearing seat;

[0036] Figure 7 It is a structural schematic diagram of another embodiment of the non-swinging transmission part (middle and left);

[0037] Figure 8 for Figure 7 A schematic structural diagram of the intermediate gear set in FIG.

[0038] Fig. 9 for Figure 1 A top view of the fuselage in FIG.

[0039] Fig.10 is a structural schematic diagram of an embodiment of the auxiliary supporting device;

[0040] Fig.11 is a structural schematic diagram of an embodiment of the guide device;

[0041] Fig.12 for Figure 2 A front view of the supporting shoe;

[0042] Fig.13 for Fig.12 A longitudinal section view of

[0043] Fig.14 It is a structural schematic diagram of the drag connection device.

[0044] Reference numerals:

[0045] 1. Cutting system; 11. Non-swinging transmission part; 110. Cutting motor; 111. Stationary housing; 1111. Front positioning hole; 1112. Rear positioning hole; 1113. Housing notch; 113. Guard plate; 114. Hydraulic system; 115 (and 115', 115"). Small gear; 116. Intermediate gear set; 1161. Eccentric shaft; 1162. Eccentric sleeve; 1163. Bearing; 1164. Intermediate gear; 12. Motorless rocker arm; 121. Rocker arm housing; 1211. Rocker arm housing notch; 122 (and 122', 122"). Large gear; 123. Planetary mechanism; 124. Support and positioning bearing; 125. Fixed-axis gear transmission structure; 126. Bearing seat; 1261. Bearing seat notch; 13. Oil cylinder; 14. Roller;

[0046] 2. Fuselage; 21. Docking surface; 22. Pin hole; 23. Connection hole; 231. Installation cavity; 24. Wire hole; 25. Inclined surface; 26. Concave surface; 27. Guide installation groove; 28. Drag connection installation groove;

[0047] 31. Positioning pin; 32. Fastener;

[0048] 4. Guide device; 41. Guide shoe; 411. Lower guide surface; 412. Front guide surface; 413. Upper guide surface; 414. Rear guide surface; 416. Front shoe; 417. Rear shoe; 418. Pin; 42. Rotary pin;

[0049] 5. Drag connection device; 51. Connection plate; 52. Connection hook; 53. Upper connection pin; 54. Lower connection pin;

[0050] 6. Supporting sliding shoe; 61. Double-ear ear seat; 64. First supporting surface; 65. Second supporting surface;

[0051] 7. Auxiliary support device; 71. Single-rod piston cylinder; 72. Auxiliary sliding shoe; 73. Cylinder pin; 74. Auxiliary sliding shoe pin; 75. Cylinder connecting piece;

[0052] 91. Support top beam;

[0053] 92. Scraper conveyor; 921. Track; 922. Drag chain. DETAILED DESCRIPTION

[0054] The present invention discloses a single-motor dual-cutting system thin coal seam coal mining machine (hereinafter referred to as thin coal seam coal mining machine), such as Figure 1-14 As shown, it includes a cutting system 1, a fuselage 2, a guide device 4, a drag connection device 5 and a support shoe 6. The cutting system includes a non-swinging transmission part 11, a motorless rocker arm 12, a cutting motor 110 and an oil cylinder 13. The non-swinging transmission part includes a stationary housing 111 and two sets of left and right front-stage transmission systems arranged in the stationary housing. The motorless rocker arm is equivalent to a swinging transmission part, and there are two left and right rocker arms, each of which includes a rocker arm housing 121 and a rear-stage transmission system arranged in the rocker arm housing. A motor installation cavity is provided in the middle position of the stationary housing, and left and right rocker arm installation cavities are respectively provided at the left and right ends. The cutting motor is installed in the motor installation cavity, and the root of the rocker arm housing of the left and right motorless rocker arms is rotatably supported in the left and right rocker arm installation cavities, so that each rocker arm housing can swing relative to the stationary housing, wherein the root of the rocker arm housing only "rotates" in the stationary housing.

[0055] The output shaft of the cutting motor is connected with the rear-stage transmission system on the corresponding side through the front-stage transmission system on the left and right sides, that is, the power output by the cutting motor is transmitted through the front-stage transmission system and the rear-stage transmission system on the corresponding side in sequence, and finally transmitted to the roller 14 at the other end of the rocker housing on the corresponding side. The input end of the rear-stage transmission system is provided with a large gear 122 and a planetary mechanism 123 connected coaxially in sequence, and the large gear and the planetary mechanism are arranged in the chamber at the root of the corresponding rocker housing, and the axis of the large gear is coaxial with the rotation center of the root of the rocker housing. When the rocker swings with a fixed axis, the large gear 122 and the planetary mechanism 123, as large and medium-sized parts in the rear-stage transmission system, are always in the stationary housing "rotating" in situ. As another large and medium-sized component, the cutting motor is installed in the stationary housing, and will not change position with the swing of the rocker, especially there is no height change, so a large space can be maintained between the rocker housing and the upper coal platform, so even when the rear rocker is cutting the top knife, the rocker housing will not interfere with the coal platform. Therefore, the present invention can ensure that the theoretical mining height range does not shrink while solving the problem of arranging large and medium-sized parts. In addition, the large and medium-sized parts are closer to the coal wall side than the small and medium-sized parts of the cutting system, which is conducive to reducing the machine face height of the coal mining machine. When the coal mining machine is matched with the scraper conveyor 92 and the support, the fuselage is located below the support top beam 91, and the front part of the fuselage is located above the chute of the scraper conveyor 92. Figure 1 , 4 Area A in the diagram corresponds to the area below the thick beam of the support, and area B corresponds to the area below the thin beam of the support. This area extends forward to the rear edge of the drum, and area C corresponds to the area of ​​the full length of the drum. After adopting the cutting system with the above structure, large and medium-sized parts such as the drum, cutting motor, planetary mechanism, etc. in the cutting system are all located in area C, which is closer to the coal wall side, and small and medium-sized parts are mainly arranged in area B, which can make more reasonable use of space and maintain a lower machine height without affecting the increase of installed power.

[0056] Each motorless rocker arm corresponds to one cylinder 13, and the two ends of the cylinder are respectively hinged to the stationary housing and the corresponding rocker arm housing. The axis of the large gear and the hinge axes at both ends of the cylinder extend in the front-to-back direction. The front and rear directions of the coal mining machine are respectively from the inside of the coal mining machine to the coal wall side and the goaf side of the coal mining machine, corresponding to Figure 1 The oil cylinder is extended and retracted to drive the motorless rocker arm to rotate and swing relative to the non-swinging transmission part.

[0057] The stationary shell is fixed on the fuselage and located in front of the fuselage. The two constitute the basic frame of the coal mining machine. In this embodiment, the front side of the fuselage is provided with a docking surface 21, a pin hole 22 and a connecting hole 23. When connected, the docking surface and the corresponding surface on the rear side of the middle part of the stationary shell 111 are mutually fitted. The two ends of the positioning pin 31 are respectively matched with the corresponding pin hole shaft holes on the fuselage and the stationary shell to achieve the positioning between the fuselage and the stationary shell. The fuselage and the stationary shell are fixed together by the fastener 32 using the connecting hole 23 and the corresponding hole on the stationary shell. The fuselage is also provided with an installation cavity 231 and a wire hole 24. The installation cavity is used to provide a fastening operation space for the fastener 32, and the wire hole is used to provide a channel for routing wires and pipes for cutting motor cables, water pipes, etc. The guide device and the support shoe are both installed on the basic frame. The two respectively support the rear and middle parts of the basic frame from below. The fuselage is floatingly connected with the drag chain 922 of the scraper conveyor through the drag connection device 5.

[0058] Regarding the cutting system, Figure 3 , 5 As shown, in the installed state, the rocker arm installation cavity opens to the rear, the root cylinder structure of the rocker arm housing is inserted into the rocker arm installation cavity from the rear to the front, and is rotatably supported on the inner wall of the rocker arm installation cavity by two front and rear support and positioning bearings 124. In this embodiment, the front and rear sections of the inner wall of the rocker arm installation cavity are respectively a front positioning hole 1111 and a rear positioning hole 1112, which are used to install the front and rear support and positioning bearings 124, respectively.

[0059] The rocker housing also includes a head and a neck between the head and the root. The rocker housing is a concave structure in which both the head and the root protrude forward relative to the neck. After installation, the head of the rocker housing and the roller and the non-swinging transmission part are in the same area in the front-to-back direction, i.e., area C. The large gear 122, the planetary mechanism 123, and the small and medium-sized fixed-axis gear transmission structure 125 constitute the rear-stage transmission system. The fixed-axis gear transmission structure 125 is located in the chambers of the neck and the head. The roller is installed on the head of the rocker housing and rotates relative to the rocker housing.

[0060] The output end of the front-stage transmission system may adopt a small gear 115 and an intermediate gear set 116 that are externally meshed with each other, and the intermediate gear set is externally meshed with the large gear.

[0061] In this embodiment, the intermediate gear set 116 preferably includes an eccentric shaft 1161, an eccentric sleeve 1162, a bearing 1163 and an intermediate gear 1164. The eccentric shaft includes a reference shaft section at both ends and an eccentric shaft section at the middle. The outer eccentric groove and the inner eccentric groove extending in the axial direction and closed at both ends are respectively provided at the farthest and closest positions on the surface of the eccentric shaft section from the axis of the reference shaft section. A keyway extending in the axial direction and not closed at both ends is provided at the thickest part of the hole wall of the eccentric sleeve. The eccentric sleeve is sleeved on the eccentric shaft section. The keyway is matched with the outer eccentric groove or the inner eccentric groove and forms a key connection between the eccentric shaft and the eccentric sleeve with the key. The reference shaft sections at both ends of the eccentric shaft are fixed on the stationary housing. The intermediate gear 1164 is installed on the outer cylindrical surface of the eccentric sleeve through the bearing 1163. The intermediate gear is located between the pinion 115 and the large gear 122 and meshes with them respectively. The axes of the pinion, the intermediate gear and the large gear are located in the same plane. The small gear, the intermediate gear set and the large gear constitute the gear speed change mechanism.

[0062] The eccentric shaft has two optional installation positions relative to the stationary housing, which are the positions where the outer eccentric groove and the inner eccentric groove are closest to the axis of the large gear. The eccentric sleeve also has two optional installation positions relative to the eccentric shaft segment, which are the positions where the outer eccentric groove and the inner eccentric groove on the eccentric shaft segment are matched with the keyway on the eccentric sleeve and key-connected with the key. When the eccentric shaft and the eccentric sleeve are arranged and installed according to their respective two optional installation positions, when the installation position of the reference shaft segment of the eccentric shaft is fixed, the axis of the outer cylindrical surface of the eccentric sleeve can have 3-4 positions, that is, the axis of the intermediate gear 1164 has 3-4 possible positions, in other words, the spacing between the intermediate gear and the axis of the large gear and the small gear can have 3-4 possible changes. By simply replacing large gears 122, 122' or 122" of different sizes and small gears 115, 115' or 115" of different sizes to adapt to the change of this spacing, different reduction ratios can be achieved, thereby obtaining a wide range of rotation speeds at the drum and achieving the purpose of speed change.

[0063] By adopting the above-mentioned gear speed change mechanism, different speed outputs of the end roller can be achieved, so that different output cutting parameters such as cutting force and cutting line speed can be obtained. After configuring rollers of different diameters, the mining of materials with different hardness such as coal and rock can be realized.

[0064] A keyway may be provided on at least one outer end surface of the reference shaft segment, and the keyway cooperates with the key to realize the positioning and anti-rotation of the eccentric shaft. The extension direction of the keyway is preferably perpendicular to the plane where the axes of the pinion, the intermediate gear and the large gear are located, which is the vertical direction in this embodiment.

[0065] A housing notch 1113 is provided on the common side wall between the rocker arm installation cavity and other adjacent cavities (mainly referring to the cavity where the output end of the front-stage transmission system is located) on the stationary housing to provide space for the rotation of the intermediate gear. A rocker arm housing notch 1211 is correspondingly provided on the root side wall of the rocker arm housing. In the installed state, the rocker arm housing notch 1211 always maintains a partial overlap area with the housing notch 1113 in the circumferential direction. The overlap area should be large enough to ensure that the intermediate gear set and the large gear are kept in meshing in the overlap area of ​​the housing notch and the rocker arm housing notch.

[0066] In this embodiment, a bearing seat 126 is fixed on the inner wall of the chamber at the root of the rocker housing 121 near the large gear, and the input end shaft diameter of the large gear is supported on the inner wall of the bearing seat 126 through a bearing. In this case, a bearing seat notch 1261 is also provided on the side wall of the bearing seat, see Figure 6 The circumferential position and size of the bearing seat notch 1261 are preferably consistent with the rocker housing notch 1211. The rocker housing notch 1211 together with the bearing seat notch 1261 provide sufficient space for the intermediate gear 1164 and the large gear 122.

[0067] Except for the above-mentioned parts, the front-stage transmission system and the rear-stage transmission system can adopt existing transmission structures, such as gear transmission, spline transmission, etc.

[0068] A guard plate 113 is installed on the left and right sides of the stationary housing. The stationary housing, the left and right rocker housings and the guard plates on the corresponding sides together form a closed cavity on the left and right sides. The left and right oil cylinders together with the stationary housing and the oil cylinder seats arranged on the rocker housing are respectively located in the left and right closed cavities. In the installed state, during the swinging process of the motorless rocker arm, the oil cylinder is always in the closed cavity as a whole. The closed cavity provides a good external environment for the oil cylinder, for example, it can avoid the influence of coal dust and gangue on the oil cylinder, make the oil cylinder more reliable in extension and contraction, and have a longer service life, thereby providing more reliable and high-quality support for the rotation of the rocker arm relative to the non-swinging transmission part.

[0069] The stationary housing is preferably a left-right symmetrical structure, and the two motor mounting cavities are located in the middle of the stationary housing in the left-right direction. Although the left and right rocker arms are installed on the same stationary housing, they are driven by the left and right cutting motors respectively. For a double-drum coal mining machine, the use of this type of stationary housing can make the overall structure of the coal mining machine more compact, suitable for double-drum operation of mining high and thin coal seams to the left or right.

[0070] The cutting system may also include two left and right hydraulic systems 114, the rear spaces of the left and right front-stage transmission systems in the stationary housing are each configured as an oil tank, and the left and right hydraulic systems are respectively installed in the left and right oil tanks, and a transmission shaft in the front-stage transmission system is used to replace the pump motor of the corresponding side hydraulic system to provide power for the hydraulic system, and the hydraulic pressure output by the hydraulic system is used as the hydraulic driving force of the oil cylinder on the corresponding side, that is, the pump group of the hydraulic system is a pump group without a pump motor. An oil tank opening may be provided on the top plate of the oil tank to facilitate the installation of the hydraulic system.

[0071] Since the power of the cutting motor is much greater than that of the pump motor, even if the power demand of the hydraulic system is large, it does not need to occupy a larger installation space like the traditional pump group due to the need to be equipped with a larger power pump motor. Therefore, the hydraulic system has a compact structure and sufficient power. The motor installation cavity and the rocker arm installation cavity are usually arranged at the left and right ends of the stationary shell. Most of the space between the two cavities is an idle area. A part of the idle area is used to make a built-in oil tank. The oil tank of the hydraulic system is changed from an external one to a built-in one of the cutting system, which can make the coal mining machine structure more compact, and will not increase the height of the machine surface, nor increase the span of the roller.

[0072] In this embodiment, the axle of the pinion gear 115 is used to output power to the hydraulic system at the same time.

[0073] The fuselage 2 adopts a solid fuselage without internal transmission, that is, the fuselage is not provided with a chamber for installing the transmission system, and the fuselage only serves to connect the cutting system with the guide device and the drag connection device. The front part of the fuselage is preferably configured as a structure that is thin in the middle and thick at both ends in the front-to-back direction, so that the height of the entire fuselage surface is low enough and the coal passing space is large enough. Furthermore, most of the top surface of the fuselage is preferably configured as an inclined surface 25 that is high in the front and low in the back, and the middle front part of the bottom surface of the fuselage is configured as a concave surface 26 that is concave toward the inside of the fuselage entity. Furthermore, the middle surface of the concave surface is preferably configured as an inclined surface with the same slope as the top surface of the fuselage located directly above it.

[0074] The single-motor dual-cutting system thin-coal seam coal mining machine also preferably includes an auxiliary support device 7, which supports the front part of the base frame near the coal wall side from below. The auxiliary support device may include a single-rod piston cylinder 71 and an auxiliary sliding shoe 72. The single-rod piston cylinder is vertically installed in the base frame and is located directly above the auxiliary sliding shoe. The downwardly extending end of the piston rod is hinged to the upper part of the auxiliary sliding shoe through an auxiliary sliding shoe pin 74. The hinge axis extends in the front-to-back direction, that is, perpendicular to the coal wall, so that the auxiliary sliding shoe can adapt to the left-right longitudinal ups and downs of the coal mining machine body. By artificially controlling the single-rod piston cylinder to maintain a set pressure value, the auxiliary support device can always maintain a certain auxiliary support force, thereby helping to reduce the wear of the support sliding shoe 6.

[0075] The base frame is provided with a vertical oil cylinder mounting hole with an opening facing downward, in which the cylinder barrel of the single-rod piston cylinder is mounted and matched with the column hole of the base frame. The upper solid part of the cylinder barrel can be hinged to the base frame through the oil cylinder pin 73 and bear the longitudinal force, and the hinge axis also extends in the front-to-back direction.

[0076] Furthermore, an anti-rotation structure is provided at the hinge of the piston rod and the auxiliary sliding shoe to prevent the auxiliary sliding shoe from rotating inwardly in the horizontal plane. The anti-rotation structure can be a fixed slot provided in the space below the cylinder barrel of the single-rod piston cylinder in the oil cylinder mounting hole, and the slot walls on both sides of the slot just fit the front and rear outer side surfaces of the hinge where the auxiliary sliding shoe pin 74 is located. The slot should have a sufficient slot depth in the height direction to ensure that the front and rear outer side surfaces where the auxiliary sliding shoe pin 74 is located are always limited in the slot when the oil cylinder is extended and retracted up and down. The force of the lateral rotation of the auxiliary sliding shoe is transmitted to the cylinder barrel through the slot, and then transmitted to the base frame through the cylinder pin 73.

[0077] The oil circuits communicating with the upper and lower chambers of the single-rod piston cylinder can be arranged in the physical structure of the cylinder barrel. The oil circuits can be connected with external oil pipes or joints through the cylinder connector 75, and the cylinder connector passes through the top physical structure of the cylinder barrel and the adjacent basic frame.

[0078] The lower part of the machine body is provided with a guide installation groove 27 to provide space for the installation of the guide device. The guide device includes a guide shoe 41 and a swivel pin 42. The upper part of the guide shoe is hinged in the guide installation groove by passing through the swivel pin, and the hinge axis extends forward and backward. The lower part of the guide shoe is provided with a guide groove, and the guide shoe straddles the track 921 of the scraper conveyor through its guide groove and can slide left and right along the track. The lower guide surface 411, the front guide surface 412, the upper guide surface 413, and the rear guide surface 414 of the guide shoe 41 correspond to the guide surfaces of the track 921 respectively and are limited on the track, so as to realize the guidance of the coal mining machine by the track.

[0079] The guide shoe can swing around the swivel pin in a vertical plane extending left and right to adapt to the ups and downs of the working surface bottom plate. The pin hole on the guide shoe through which the swivel pin is inserted is preferably a waist-shaped hole with a left and right width greater than the upper and lower widths. The front side and rear side of the guide shoe are preferably smooth transition surfaces with the middle part facing outward and the left and right ends facing inward, so as to ensure that the guide shoe can perform a certain deflection in the horizontal plane to adapt to the horizontal bending of the working surface bottom plate. The "outside" mentioned here refers to the front and rear directions for the front side and the rear side, respectively. The guide device balances a part of the gravity of the fuselage, bears the cutting reaction force, and at the same time has a guiding function to guide the coal mining machine to slide along the track.

[0080] The surfaces of the guide groove and the rail are specially treated to resist wear and tear. The guide shoes and rails are detachable and easy to replace parts. Once they are worn to a certain extent, they can be replaced. This can greatly improve the overall work efficiency and reliability of equipment operation.

[0081] The guide shoe preferably includes a front shoe 416, a rear shoe 417 and a pin 418. The front shoe and the rear shoe are arranged in close contact with each other in front and back, and the contact surface is positioned by the pin. The front shoe, the rear shoe and the pin are connected by fasteners such as screws that are passed through the front and back directions. There are multiple pins that are arranged at intervals on the left and right.

[0082] The upper part of the support shoe is hinged to the fuselage, and the hinge axis extends forward and backward. In this embodiment, the upper part of the support shoe is provided with a double-ear ear seat 61, and a hinge seat is usually provided at the corresponding position of the lower part of the fuselage. The seat hole of the hinge seat extends in the front and rear directions, and the support shoe is hinged on the hinge seat through a pin. The bottom of the support shoe is provided with two supporting surfaces, one in front and one in the back, which are the second supporting surface 65 and the first supporting surface 64. When in use, the first supporting surface is supported on the shovel plate of the scraper conveyor, and the second supporting surface is supported on the bottom plate of the coal mining working surface. Compared with the existing support shoe with only one supporting surface for supporting on the shovel plate, it can not only increase the contact area, reduce the specific pressure, and extend the service life of the support shoe, but also because the setting of the second supporting surface is equivalent to moving the supporting position to the coal wall side, it can greatly improve the stability of the thin coal seam coal mining machine adopting the suspended fuselage method.

[0083] In order to adapt to the height difference between the shovel plate and the bottom plate, the first supporting surface is higher than the second supporting surface, and both the first supporting surface and the second supporting surface are provided with a wear-resistant layer.

[0084] The supporting sliding shoes, auxiliary supporting devices and guiding devices are arranged in one set on each side of the coal mining machine. Thus, a suspended body coal mining machine has four fixed supporting positions and two floating supporting positions, and the stability of the coal mining machine can be better guaranteed.

[0085] The lower part of the fuselage is also provided with a drag connection installation slot 28 to provide space for the installation of the drag connection device. Fig.14 As shown, the drag connection device includes a connection plate 51 and a connection hook 52, one end of the connection plate is hinged in the drag connection installation groove 28 on the fuselage through an upper connection pin 53, the diameter of the pin hole on the connection plate for inserting the upper connection pin is larger than the upper connection pin, the other end of the connection plate is hinged to one end of the connection hook through a lower connection pin 54, the hinge axes of the two hinges are both extended left and right, the other end of the connection hook is set as a cylindrical structure with an axis extending left and right, the cylindrical structure is set in the chain groove of the scraper conveyor 92, and is slidably connected to the chain groove, and a drag chain 922 is connected to each of the two ends of the cylindrical structure. Applying a pulling force in the left and right directions to the drag chain can drive the coal mining machine to move left and right. The present invention adopts a guide device to cooperate with the drag connection device. Since the cutting reaction force of the coal mining machine is borne by the guide device, the drag connection device 5 only bears the pulling force in the left and right directions, so that the wear at the chain groove can be greatly reduced, and the life of the drag chain can be greatly improved.

Claims

1. A single motor dual cutting system thin coal seam shearer, characterized by: It includes a cutting system, a fuselage, a guide device, a drag connection device and a supporting shoe. The cutting system includes a non-swinging transmission part, a motorless rocker arm, a cutting motor and an oil cylinder. The non-swinging transmission part includes a stationary shell and two left and right sets of front-stage transmission systems arranged in the stationary shell. There are two motorless rockers on the left and right, both of which include a rocker shell and a rear-stage transmission system arranged in the rocker shell. A motor installation cavity is provided in the middle position of the stationary shell, and left and right rocker arm installation cavities are respectively provided at the left and right ends. The cutting motor is installed in the motor installation cavity. The roots of the rocker arm shells of the left and right motorless rockers are rotatably supported in the left and right rocker arm installation cavities respectively. The output shaft of the machine is connected with the rear-stage transmission system on the corresponding side through the front-stage transmission system on the left and right sides. The input end of the rear-stage transmission system is provided with a large gear and a planetary mechanism coaxially connected in sequence. The large gear and the planetary mechanism are arranged in the chamber at the root of the corresponding rocker arm housing. The axis of the large gear is coaxial with the rotation center of the root of the rocker arm housing. Each motorless rocker arm corresponds to one cylinder. The two ends of the cylinder are respectively hinged to the stationary housing and the corresponding rocker arm housing. The axis of the large gear and the hinge axes at both ends of the cylinder extend in the front-rear direction. The stationary housing is fixed on the fuselage and located in front of the fuselage. The two constitute the basis of the coal mining machine. The frame, the guide device and the supporting shoe are both installed on the basic frame, and the two respectively support the rear and middle parts of the basic frame from below, and the fuselage is floatingly connected with the drag chain of the scraper conveyor through the drag connection device; the output end of the front-stage transmission system adopts a small gear and an intermediate gear group that are externally meshed with each other, and the intermediate gear group is externally meshed with the large gear, and the intermediate gear group includes an eccentric shaft, an eccentric sleeve, a bearing and an intermediate gear, and the eccentric shaft includes a reference shaft section located at both ends and an eccentric shaft section located in the middle, and an outer eccentric groove and an inner eccentric groove extending along the axial direction and closed at both ends are respectively provided at the positions on the surface of the eccentric shaft section that are farthest and closest to the axis of the reference shaft section, and the eccentric A keyway extending axially and not closed at both ends is provided at the thickest part of the hole wall of the sleeve. The eccentric sleeve is sleeved on the eccentric shaft segment. The keyway is matched with the outer eccentric groove or the inner eccentric groove and forms a key connection with the key between the eccentric shaft and the eccentric sleeve. The reference shaft segments at both ends of the eccentric shaft are fixed on the stationary housing. The intermediate gear is installed on the outer cylindrical surface of the eccentric sleeve through the bearing. The intermediate gear is located between the pinion and the large gear and meshes with them externally respectively. The axes of the pinion, the intermediate gear and the large gear are located in the same plane. The eccentric shaft has two optional installation positions, which are the positions where the outer eccentric groove and the inner eccentric groove are closest to the axis of the large gear.

2. The single-motor dual-cutting system thin coal seam shearer according to claim 1, characterized in that: A shell slot is provided on the common side wall between the rocker arm mounting cavity and other adjacent cavities on the stationary shell, and a rocker arm shell notch is provided on the root side wall of the rocker arm shell. In the installed state, the rocker arm shell notch always maintains a partial overlapping area with the shell slot in the circumferential direction, and the intermediate gear set and the large gear remain meshed in the overlapping area of ​​the shell slot and the rocker arm shell notch.

3. The single-motor dual-cutting system thin coal seam shearer according to claim 2, characterized in that: The stationary shell is provided with guard plates on the left and right sides respectively. The stationary shell, the left and right rocker arm shells and the guard plates on the corresponding sides together form a closed cavity on the left and right sides respectively. The left and right oil cylinders are respectively located in the two closed cavities on the left and right sides.

4. The single motor dual cutting system thin coal seam shearer according to claim 1, 2 or 3, characterized in that: The cutting system also includes two left and right hydraulic systems. The rear spaces of the left and right front-stage transmission systems in the stationary shell are each configured as an oil tank, and the left and right hydraulic systems are respectively installed in the left and right oil tanks. A transmission shaft in the front-stage transmission system replaces the pump motor of the hydraulic system on the corresponding side to provide power for the hydraulic system, and the hydraulic pressure output by the hydraulic system serves as the hydraulic driving force of the oil cylinder on the corresponding side.

5. The single-motor dual-cutting system thin coal seam shearer according to claim 4, characterized in that: The fuselage is a solid fuselage without internal transmission. Most of the top surface of the fuselage is arranged as an inclined surface with a high front and a low back, and the middle front part of the bottom surface of the fuselage is arranged as an inwardly concave surface.

6. The single-motor dual-cutting system thin coal seam shearer according to claim 1, 2 or 3, characterized in that: It also includes an auxiliary supporting device, which supports the front part of the base frame from below. The auxiliary supporting device includes a single-rod piston cylinder and an auxiliary sliding shoe. The single-rod piston cylinder is vertically installed in the base frame and is located directly above the auxiliary sliding shoe. The downwardly extending end of the piston rod is hinged to the upper part of the auxiliary sliding shoe, and the hinge axis extends in the front-to-back direction.

7. The single-motor dual-cutting system thin coal seam shearer according to claim 4, characterized in that: It also includes an auxiliary supporting device, which supports the front part of the base frame from below. The auxiliary supporting device includes a single-rod piston cylinder and an auxiliary sliding shoe. The single-rod piston cylinder is vertically installed in the base frame and is located directly above the auxiliary sliding shoe. The downwardly extending end of the piston rod is hinged to the upper part of the auxiliary sliding shoe, and the hinge axis extends in the front-to-back direction.

8. The single-motor dual-cutting system thin coal seam shearer according to claim 6, characterized in that: The guide device includes a guide shoe and a swivel pin. The upper part of the guide shoe is hinged to the fuselage by passing the swivel pin. The hinge axis extends forward and backward. The pin hole on the guide shoe through which the swivel pin is passed is a waist-shaped hole with a left and right width greater than the upper and lower widths. The front side and the rear side of the guide shoe are both smooth transition surfaces with the middle part close to the outside and the left and right ends close to the inside.

9. The single-motor dual-cutting system thin coal seam shearer according to claim 7, characterized in that: The guide device includes a guide shoe and a swivel pin. The upper part of the guide shoe is hinged to the fuselage by passing the swivel pin. The hinge axis extends forward and backward. The pin hole on the guide shoe through which the swivel pin is passed is a waist-shaped hole with a left and right width greater than the upper and lower widths. The front side and the rear side of the guide shoe are both smooth transition surfaces with the middle part close to the outside and the left and right ends close to the inside.

10. The single-motor dual-cutting system thin-coal seam shearer according to claim 8, characterized in that: The guide sliding shoe comprises a front sliding shoe, a rear sliding shoe and a pin shaft. The front sliding shoe and the rear sliding shoe are arranged in close contact with each other in front and back directions. The contact surface is positioned by the pin shaft. The front sliding shoe, the rear sliding shoe and the pin shaft are fastened and connected by screws provided in the front and back directions. There are multiple pin shafts, which are arranged at intervals in the left and right directions.

11. The single-motor dual-cutting system thin coal seam shearer according to claim 6, characterized in that: The upper part of the supporting shoe is hinged to the fuselage, and the hinge axis extends forward and backward. The bottom of the supporting shoe is provided with two supporting surfaces, one in front and one in the back, which are the second supporting surface and the first supporting surface respectively. The first supporting surface is higher than the second supporting surface. Both the first supporting surface and the second supporting surface are provided with a wear-resistant layer.

12. The single-motor dual-cutting system thin-coal seam shearer according to claim 7, characterized in that: The upper part of the supporting shoe is hinged to the fuselage, and the hinge axis extends forward and backward. The bottom of the supporting shoe is provided with two supporting surfaces, one in front and one in the back, which are the second supporting surface and the first supporting surface respectively. The first supporting surface is higher than the second supporting surface. Both the first supporting surface and the second supporting surface are provided with a wear-resistant layer.

13. The single-motor dual-cutting system thin coal seam shearer according to claim 6, characterized in that: The drag connection device includes a connecting plate and a connecting hook, one end of the connecting plate is hinged to the fuselage through an upper connecting pin, the diameter of the pin hole on the connecting plate for passing the upper connecting pin is larger than the upper connecting pin, the other end of the connecting plate is hinged to one end of the connecting hook through a lower connecting pin, the hinge axes of these two hinges are extended left and right, the other end of the connecting hook is arranged as a cylindrical structure with an axis extending left and right, the cylindrical structure is arranged in the chain groove of the scraper conveyor, and is slidably connected to the chain groove, and both ends of the cylindrical structure are connected to a drag chain.

14. The single-motor dual-cutting system thin coal seam shearer according to claim 7, characterized in that: The drag connection device includes a connecting plate and a connecting hook, one end of the connecting plate is hinged to the fuselage through an upper connecting pin, the diameter of the pin hole on the connecting plate for passing the upper connecting pin is larger than the upper connecting pin, the other end of the connecting plate is hinged to one end of the connecting hook through a lower connecting pin, the hinge axes of these two hinges are extended left and right, the other end of the connecting hook is arranged as a cylindrical structure with an axis extending left and right, the cylindrical structure is arranged in the chain groove of the scraper conveyor, and is slidably connected to the chain groove, and both ends of the cylindrical structure are connected to a drag chain.

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