Shearer traction system for thin coal seams

Abstract

The present invention relates to a traction system for a thin coal seam shearer, which comprises a traction housing, a high-speed stage reduction mechanism, an intermediate stage reduction mechanism and a traction motor. The traction housing is in an L shape and includes a front-back extending section and a left-right extending section. The traction motor and the high-speed stage reduction mechanism are arranged in the front-back extending section, and the intermediate stage reduction mechanism is arranged in the left-right extending section. The output shaft of the traction motor is coaxially and fixedly connected to the input end of the high-speed stage reduction mechanism, the output end of the high-speed stage reduction mechanism is coaxially and fixedly connected to the input end of the intermediate stage reduction mechanism, and the output end of the intermediate stage reduction mechanism is closer to the end of the left-right extending section away from the front-back extending section than the input end. The present invention can enable a thin or extremely thin coal seam shearer with high power and low mining height to obtain a larger coal passing height under the condition of the same machine surface height, and at the same time solve the problems of large traction resistance and aggravated wear of the guiding device in the existing suspended fuselage mode.

Description

Technical Field

[0001] The present invention relates to a traction system for a coal shearer, and is particularly applicable to a low-body high-power coal shearer for mining thin or extremely thin coal seams. Background Art

[0002] For the mining of thin or extremely thin coal seams, it is required that the body of the coal shearer for thin or extremely thin coal seams be lower and lower. On the other hand, in order to adapt to the mining of complex geological conditions such as the coexistence of coal and rock, a larger installed power is required. As the power increases, the sizes of the motor, transmission system, etc. also increase correspondingly by a large amount, which becomes a contradiction with the requirement of a lower body. Therefore, the structural design of the coal shearer for thin or extremely thin coal seams is a difficult point. One prominent problem is that the coal passing height below the body and above the scraper conveyor is too small. When encountering large pieces of coal, gangue, etc., it will cause problems such as chain jamming of the scraper conveyor, greatly increased resistance of the coal shearer, and insufficient effective traction force.

[0003] The industry has proposed and gradually used a technical solution to move large and medium-sized components such as motors and transmission gears from above the original scraper conveyor to the side close to the coal wall, that is, adopting the way of a suspended body to solve the layout problem of large and medium-sized components. This way is beneficial to reducing the height of the body, but usually still cannot solve the problem of too small coal passing height. Moreover, the complex traction system occupies a long distance in the left-right direction on the side close to the coal wall. Coupled with the layout of the cutting system of the coal shearer, the span between the two drums is very long, which greatly reduces the adaptability of the coal shearer to complex geological conditions and is prone to problems such as jamming, coal squeezing, and large traction resistance. In addition, the structure of the suspended body is also prone to causing the center of gravity of the body to shift towards the coal wall side, resulting in increased wear of the guiding device of the coal shearer on the side far from the coal wall. Summary of the Invention

[0004] The present invention aims to provide a traction system for a thin coal seam coal shearer, which can enable a thin or extremely thin coal seam coal shearer with high power and low mining height to obtain a larger coal passing height under the condition of the same machine surface height, and at the same time solve problems such as large traction resistance and increased wear of the guiding device in the existing suspended body method.

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

[0006] A traction system for a thin coal seam shearer, comprising a traction housing, a high-speed stage reduction mechanism, an intermediate stage reduction mechanism, and a traction motor. The traction housing is in an L shape, including a front-back extending section and a left-right extending section. The traction motor and the high-speed stage reduction mechanism are arranged in the front-back extending section, and the intermediate stage reduction mechanism is arranged in the left-right extending section. The output shaft of the traction motor is coaxially and fixedly connected to the input end of the high-speed stage reduction mechanism. The output end of the high-speed stage reduction mechanism is coaxially and fixedly connected to the input end of the intermediate stage reduction mechanism. The output end of the intermediate stage reduction mechanism is closer to the end of the left-right extending section away from the front-back extending section than the input end.

[0007] The high-speed stage reduction mechanism preferably adopts a compact planetary mechanism.

[0008] The intermediate stage reduction mechanism is a fixed-axis transmission gear set, including a head gear assembly, an intermediate gear assembly, and a tail gear assembly arranged in sequence according to the transmission direction. The axes of each are arranged in parallel. The input end of the head gear assembly is coaxially and fixedly connected to the output end of the high-speed stage reduction mechanism. The intermediate gear assembly may include one or more transmission shafts.

[0009] The left-right extending section is preferably made into a solid body except for the necessary installation space for the intermediate gear assembly and the necessary process holes.

[0010] The thickness of the left-right extending section is less than that of the front-back extending section. The middle and rear section of the bottom surface of the left-right extending section is preferably set as a concave surface that is concave in the middle in the front-back direction.

[0011] The middle and rear section of the top surface of the left-right extending section is preferably set as an inclined surface that is higher in the front and lower in the rear.

[0012] The traction system of the thin coal seam shearer further includes a traveling mechanism, which includes a traveling box housing, a driving wheel, a driving wheel shaft, a traveling wheel assembly, a traveling wheel shaft, and a guiding sliding shoe. The traveling box housing is fixed on the rear outer wall of the traction housing. The front end of the driving wheel shaft is coaxially and fixedly connected to the output end of the intermediate reduction mechanism. The driving wheel shaft passes through the traction housing and the traveling box housing backward and is rotatably supported on the front and rear side walls of the traveling box housing. The driving wheel is coaxially fixed on the driving wheel shaft. The two ends of the traveling wheel shaft are respectively rotatably supported on the front and rear side walls of the traveling box housing. The large gear in the traveling wheel assembly is coaxially fixedly connected to the traveling wheel. The traveling wheel is coaxially installed on the traveling wheel shaft. The large gear is externally meshed with the driving wheel. The guiding sliding shoe includes a base and an ear seat located above the base. The base includes a front side wall, a rear side wall, and a top plate connected between the front and rear side walls. A barb is provided at the bottom of the front side wall or the rear side wall. At the left and right ends of the base, a guiding groove extending left and right is formed by the front side wall, the top plate, the rear side wall, and the barb respectively. The guiding sliding shoe is installed at the lower part of the traveling box and is swingably connected to the traveling box housing through an ear hole on its ear seat. The axis of the traveling wheel shaft coincides with the center line of the ear hole. The guiding sliding shoe is provided with a concave surface recessed inwardly towards the base at each of the left and right sides. The concave surface is located at least at one of the following positions: the left and right side surfaces of the ear seat, the left and right top surfaces of the base separated by the ear seat, and the transition joints between the left and right sides of the ear seat and the top surface of the base. The driving wheel shaft is arranged radially close to the concave surface. In the left and right directions, the driving wheel shaft is located between the ear seat and one of the guiding grooves.

[0013] Further, a spline connection is provided between the middle part of the axial direction of the traveling wheel and the traveling wheel shaft, and a clearance fit of shaft and hole is provided between the two ends of the traveling wheel and the traveling wheel shaft.

[0014] The driving wheel and the driving wheel shaft are preferably of an integral structure.

[0015] The driving wheel shaft and the traveling wheel shaft are rotatably supported on the traveling box housing through bearings. The large gear can be connected to the traveling wheel through a spline and is fixed to each other axially. The traveling wheel is sleeved on the traveling wheel shaft and is connected to the traveling wheel shaft through a spline.

[0016] The beneficial effects of the present invention are:

[0017] The large and medium-sized traction motors and high-speed reduction mechanisms are arranged close to the coal wall, between the left and right rollers and in the lower space in front of the coal mining machine support. The small and medium-sized intermediate reduction mechanisms are arranged above the scraper conveyor and below the thin beam at the front end of the top beam of the coal mining machine support. While reducing the height of the machine body, it ensures that there are sufficient effective gaps between the top plate, bottom plate and coal wall above and below the traction part between the rollers and in front of the coal wall.

[0018] Since the high-speed section speed reduction mechanism and the traction motor are arranged axially, the space occupied by the traction system in the left and right directions is reduced. Since the traction housing is arranged in an L shape, a part of it is arranged above the scraper conveyor, and the other part is arranged to be cantilevered to the coal wall side, the space occupied by the traction system between the left and right rollers is further reduced. Therefore, the left and right cutting devices can be arranged close to the middle of the machine body, thereby greatly shortening the distance between the two rollers and greatly improving the adaptability of the thin coal seam shearer to the undulating working surface.

[0019] The use of a compact planetary mechanism can provide a large reduction ratio, which can not only improve the stiffness and strength of its own planetary wheel axle, but also help to reduce the size of the intermediate section reduction mechanism and increase its life. Correspondingly, the size of the integrated drive wheel connected to the output end of the intermediate section reduction mechanism can also be smaller, thereby helping to shorten the height difference between the walking wheel axle and the driving wheel axle, and thus helping to reduce the machine surface height or increase the coal passing height.

[0020] By increasing or decreasing the number of transmission shafts included in the intermediate gear assembly, and then replacing the traction housing with left and right extension sections of different lengths in the left and right directions, the span between the left and right running wheels can be adjusted. When the span between the left and right running wheels is appropriately increased, the overall stability of the coal mining machine can be improved. Due to the L-shaped structure of the traction housing and its arrangement position relative to the machine body, the distance between the left and right rollers will not increase while increasing the span of the running wheels.

[0021] The left and right extension sections are designed according to the principle of minimizing the internal cavity, retaining only the necessary installation space and necessary processing holes for the intermediate gear assembly and related parts, and the remaining parts are made into solid bodies. In this way, the center of gravity of the entire coal mining machine can be moved to the mining side, maintaining the balance of the coal mining machine's operation and reducing the wear of the guide device.

[0022] The middle and rear sections of the bottom surface of the left and right extension sections are set as concave surfaces that are concave in the middle in the front-back direction, and the middle and rear sections of the top surface are set as inclined surfaces that are higher in the front and lower in the rear. Moreover, the inclination angle of the inclined surface is parallel or nearly parallel to the bottom inclined surface of the roof beam of the shearer support, which is conducive to ensuring sufficient safety distances between the left and right extension sections, the scraper conveyor, and the shearer support. At the same time, since there are also sufficient safety distances between the front and rear extension sections and the roof, the floor, and the coal wall, the adaptability of the thin seam shearer to the working face with undulating conditions can be improved.

[0023] Since a concave surface is provided on the left side and / or the right side of the ear seat of the guiding sliding shoe, the installation position of the driving wheel shaft can be closer to the walking wheel shaft. Therefore, the height difference between the driving wheel shaft and the walking wheel shaft in the height direction can be set very small. Without changing the height of the machine surface of the shearer body, the coal passing height above the scraper conveyor and below the machine body can be increased significantly. Therefore, problems such as chain jamming of the scraper conveyor, increased resistance of the shearer, and insufficient effective traction force when the thin or extremely thin seam shearer encounters large pieces of coal, gangue, etc. can be solved.

[0024] Since an integrated driving wheel is adopted, the diameters of the wheel shaft and the gear part of the driving wheel can be smaller. The installation method between the walking wheel and the walking wheel shaft also determines that the diameter of the walking wheel can be smaller. Therefore, it becomes possible to implement a walking box with a double-shaft structure on the thin or extremely thin seam shearer, which is not only conducive to achieving a sufficiently large coal passing height or obtaining a lower machine surface height, but also can ensure the normal meshing of the walking system with the scraper conveyor track. And because a multi-gear transmission of the driving wheel through a large gear to the walking wheel is adopted, compared with the direct drive of the driving wheel to the walking wheel, the gear life can be greatly improved. Brief Description of the Drawings

[0025] Figure 1 Horizontal cross-sectional view (left traction system) of an embodiment of the present invention;

[0026] Figure 2 Vertical sectional three-machine sectional view of an embodiment of the present invention;

[0027] Figure 3 Schematic diagram of the layout position of an embodiment of the present invention on the whole shearer (including left and right traction systems);

[0028] Figure 4 is Figure 1 partial view of;

[0029] Figure 5 Another vertical sectional three-machine sectional view of an embodiment of the present invention;

[0030] Figure 6 Front view of an embodiment of the left walking mechanism;

[0031] Figure 7 is Figure 6 the A-A stepped sectional view of

[0032] Figure 8 is Figure 6 the front view of the guiding slide shoe described in

[0033] Figure 9 is Figure 8 the C-C sectional view of

[0034] Figure 10 is Figure 8 the top view of

[0035] Reference numerals:

[0036] 1. Traction housing; 13. Cable channel; 171. Horizontal plane; 172. Inclined plane; 18. Concave surface;

[0037] 2. High-speed stage reduction mechanism; 21. First-stage planetary mechanism; 22. Second-stage planetary mechanism;

[0038] 3. Intermediate stage reduction mechanism; 31. Head gear assembly; 32. Intermediate gear assembly; 33. Tail gear assembly;

[0039] 4. Traction motor;

[0040] 5. High-torque braking mechanism;

[0041] 6. Traveling mechanism; 61. Integrated drive wheel; 62. Large gear; 63. Traveling wheel; 64. Guiding slide shoe; 641. Base; 642. Ear seat; 643. Concave surface; 65. Traveling box housing; 66. Traveling wheel shaft;

[0042] 91. Bracket; 911. Bottom inclined surface of the top beam; 912. Bottom thin surface of the top beam;

[0043] 92. Scraper conveyor; 921. Middle plate; 922. Side trough; 923. Scraper conveyor groove; 924. Track;

[0044] 93. Intermediate frame;

[0045] 94. Shearer cutting device; 941. Drum. Detailed implementation manners

[0046] The present invention discloses a shearer traction system for thin coal seams (which can be abbreviated as the traction system), as shown in Figures 1-10As shown in the figure, it includes a traction housing 1, a high-speed stage reduction mechanism 2, an intermediate stage reduction mechanism 3, and a traction motor 4. The traction housing is L-shaped, including a front-back extension section and a left-right extension section. The traction motor and the high-speed stage reduction mechanism are arranged in the front-back extension section, and the intermediate stage reduction mechanism is arranged in the left-right extension section. The output shaft of the traction motor is coaxially and fixedly connected to the input end of the high-speed stage reduction mechanism. The output end of the high-speed stage reduction mechanism is coaxially and fixedly connected to the input end of the intermediate stage reduction mechanism. The output end of the intermediate stage reduction mechanism is closer to the end of the left-right extension section away from the front-back extension section than the input end. When the traction system is installed on the shearer, the left and right sides of the front-back extension section are connected between the shearer cutting device 94 and the intermediate frame 93 of the shearer. The left-right extension section is arranged above the scraper conveyor 92 and below the shearer support 91. The front-back extension section overhangs toward the coal wall side, and the output shaft of the traction motor extends toward the gob side.

[0047] Both the traction motor and the high-speed stage reduction mechanism are large and medium-sized components, and mainly small and medium-sized components in the intermediate stage reduction mechanism. By placing the traction motor and the high-speed stage reduction mechanism closer to the coal wall side, in the space between the left and right drums 941 and below and in front (i.e., closer to the coal wall side) of the shearer support 91, and arranging the intermediate stage reduction mechanism above the scraper conveyor and below the thin beam at the front end of the top beam of the shearer support, while reducing the height of the fuselage, it ensures that there are sufficient effective roof, floor, and coal wall clearances above, below, and in front of the traction part between the drums.

[0048] Axially arranging the high-speed stage reduction mechanism and the traction motor reduces the space occupied by the traction system in the left-right direction. And setting the traction housing as L-shaped, with a part of it arranged above the scraper conveyor and another part arranged to overhang toward the coal wall side, further reduces the space occupied by the traction system in the space between the left and right drums. Therefore, the left and right cutting devices can be arranged closer to the middle of the fuselage, thus greatly shortening the distance between the two drums and greatly improving the adaptability of the thin seam shearer to the undulating working face.

[0049] The high-speed stage reduction mechanism preferably adopts a compact planetary mechanism to maintain a small axial dimension, ensure the strength and stiffness of the planetary gear shaft, and also helps to reduce the front-back dimension of the traction system.

[0050] The compact planetary mechanism includes a series-connected first-stage planetary mechanism 21 and a second-stage planetary mechanism 22. The compact planetary mechanism can provide a large reduction ratio, which helps the intermediate stage reduction mechanism to reduce its size and improve its service life.

[0051] The intermediate section speed reduction mechanism is a multi-axis fixed axis transmission gear set, including a head end gear assembly 31, an intermediate gear assembly 32 and a terminal gear assembly 33 arranged in sequence according to the transmission direction, each axis is arranged in parallel, and the input end of the head end gear assembly is coaxially fixedly connected with the output end of the high-speed section speed reduction mechanism. In the left and right extension sections, each transmission shaft in the intermediate section speed reduction mechanism corresponds to a mounting hole.

[0052] The intermediate gear assembly may include one or more transmission shafts. By increasing or decreasing the number of transmission shafts included in the intermediate gear assembly, and then replacing the traction housing with left and right extension sections of different lengths in the left and right directions, the span between the left and right running wheels can be adjusted. When the span between the left and right running wheels is appropriately increased, the overall stability of the coal mining machine can be improved. Due to the L-shaped structure of the traction housing and its arrangement position relative to the machine body, the distance between the left and right rollers will not increase while increasing the span of the running wheels.

[0053] A high torque brake mechanism 5 is provided at the end (also the rear end) of the rotating shaft of the head end gear assembly. When the coal mining machine stops, the high torque brake mechanism is used to brake the machine to prevent it from sliding down when the working surface has a large inclination angle.

[0054] In front of the traction motor 4 in the traction housing 1 is a cable channel 13 for providing a cable passage space. The traction housing is also provided with a connection hole for installing a traveling mechanism.

[0055] The left and right extension sections are designed according to the principle of minimizing the internal cavity, retaining only the necessary installation space and necessary processing holes for the intermediate gear assembly and related parts, and the remaining parts are made into solid bodies. In this way, the center of gravity of the entire coal mining machine can be moved to the mining side, maintaining the balance of the coal mining machine's operation and reducing the wear of the guide device.

[0056] The thickness of the left and right extension sections is smaller than that of the front and rear extension sections. The front sections of the bottom surfaces of the left and right extension sections are set as horizontal surfaces, and the middle and rear sections of the bottom surfaces of the left and right extension sections are set as concave surfaces 18 with a concave middle portion in the front-to-back direction, so that a sufficient coal-passing gap can be maintained between the traction housing 1 and the middle plate 921 of the scraper conveyor 92.

[0057] The front section of the top surface of the left and right extension sections is set as a horizontal plane 171, and the middle and rear sections of the top surface of the left and right extension sections are set as an inclined surface 172 which is higher in the front and lower in the back. The inclination angle of the inclined surface 172 is preferably parallel or nearly parallel to the bottom inclined surface 911 of the top beam of the coal mining machine support 91. The horizontal plane 171 and the inclined surface 172 are kept as equidistant as possible from the front horizontal bottom thin surface 912 of the coal mining machine support 91 and the rear most inclined bottom inclined surface 911 of the top beam, so as to ensure that there is sufficient effective clearance above the coal mining machine.

[0058] It can be seen that there is sufficient safety distance between the front and rear extension sections and the roof, floor, and coal wall, as well as between the left and right extension sections and the shearer support and scraper conveyor (including the trough side 922), ensuring the roof clearance, floor clearance, coal wall clearance, and clearance passing the machine, and improving the adaptability of the thin seam shearer to the undulating working face.

[0059] In addition, the traction system of the thin seam shearer may further include a traveling mechanism 6, which includes a traveling box housing 65, a drive wheel, a drive wheel shaft, a traveling wheel assembly, a traveling wheel shaft 66, and a guiding slide shoe 64. The traveling box housing 65 is fixed on the rear outer wall of the left and right extension sections of the traction housing 1. The front end of the drive wheel shaft is coaxially and fixedly connected to the output end of the intermediate section reduction mechanism. The drive wheel shaft passes backward through the traction housing and the traveling box housing and is rotatably supported on the front and rear side walls of the traveling box housing. The drive wheel is coaxially fixed on the drive wheel shaft. The two ends of the traveling wheel shaft 66 are respectively rotatably supported on the front and rear side walls of the traveling box housing 65. The large gear 62 and the traveling wheel 63 in the traveling wheel assembly are coaxially and fixedly connected, and the traveling wheel is coaxially installed on the traveling wheel shaft 66. The large gear 62 is externally meshed with the drive wheel.

[0060] The guiding slide shoe 64 includes a base 641 and an ear seat 642 located above the base and generally in the middle of the left and right length directions. The base includes a front side wall, a rear side wall, and a top plate connected between the tops of the front and rear side walls. The bottom of the front side wall or the rear side wall is provided with a barb. At the left and right ends of the base, a left and right extending guiding groove is respectively formed by the front side wall, the top plate, the rear side wall, and the barb for cooperating with the track 924. Wear-resistant layers are provided on the rear surface of the front side wall, the bottom surface of the top plate, the front surface of the rear side wall, and the top surface of the barb. The guiding slide shoe is installed at the lower part of the traveling box housing and is swingably connected to the traveling box housing through the ear hole on its ear seat. Ideally, the axis of the traveling wheel shaft coincides with the center line of the ear hole. The guiding slide shoe can have a small amount of longitudinal movement relative to the traveling box housing in the front and rear directions, providing sufficient swing space for the guiding slide shoe in the horizontal and vertical directions.

[0061] The guiding slide shoe is provided with a concave surface 643 recessed inwardly towards the inside of the base on each of the left and right sides. The concave surface is located at least at one of the positions of the left and right side surfaces of the ear seat, the left and right top surfaces of the base separated by the ear seat, and the transition joints between the left and right sides of the ear seat and the top surface of the base (i.e., the top surface of the top plate). The drive wheel shaft is arranged as close as possible to the concave surface in the radial direction, and in the left and right directions, the drive wheel shaft is located between the ear seat and one of the guiding grooves.

[0062] The power output by the intermediate section deceleration mechanism is transmitted to the driving wheel shaft, and then transmitted from the driving wheel to the large gear. The large gear 62 rotates synchronously with the traveling wheel 63. Finally, the traveling wheel 63 meshes and rolls in the position defined by the opening of the guiding sliding shoe 64 and travels along the track 924. The track 924 is located in the groove 923 of the scraper conveyor. The cooperation of the traveling wheel 63, the guiding sliding shoe 64 and the track 924 provides traction and guidance for the low-body traction system.

[0063] Setting the concave surface can leave space for the driving wheel shaft to be installed closer to the traveling wheel shaft in the radial direction. Installing the driving wheel shaft and the traveling wheel shaft closer can greatly reduce the height difference between the two in the height direction. Without changing the height of the machine surface of the shearer body, the coal passing height below the body and above the scraper conveyor can be increased significantly. Therefore, problems such as chain jamming of the scraper conveyor, increased resistance of the shearer, and insufficient effective traction when the shearer encounters large pieces of coal, gangue, etc. in thin or extremely thin coal seams can be solved.

[0064] At least one concave surface is provided, which is located on the left or right side of the ear seat, but preferably one is provided on each of the left and right sides, so that the same guiding sliding shoe can be used for both the left and right traveling systems of the shearer. Further, the guiding sliding shoe is generally a left-right symmetric structure and can be installed interchangeably when used on the left and right traveling boxes of the shearer.

[0065] The concave surface is preferably a straight cylindrical surface, and the generatrix of the straight cylindrical surface extends forward and backward. In the assembled state, the driving wheel shaft is arranged close to the concave surface. The radius of curvature of the concave surface is determined according to the diameter of the driving wheel shaft and should generally not be less than the radius of the driving wheel shaft.

[0066] Since the driving wheel shaft can be installed closer to the traveling wheel, the driving wheel shaft will occupy a part of the space of the guiding sliding shoe in the left-right direction in the installed state. Therefore, the total length of the guiding sliding shoe is longer. The guiding groove is located on the left or right outer side of the driving wheel shaft and its length can be appropriately extended, and the length of the corresponding wear-resistant layer is also longer. This can improve the service life of the guiding sliding shoe to a certain extent.

[0067] The ear hole is preferably a waist-shaped hole that is wider left and right and narrower up and down, which is beneficial to providing the space required for the horizontal swing of the guiding sliding shoe relative to the traveling box housing.

[0068] The driving wheel and the driving wheel shaft are preferably of an integral structure, which can be called an integral driving wheel 61. Compared with the split structure, the diameters of the wheel shaft and the gear part can be smaller, the machine surface height can be set lower, and at the same time, there is a larger coal passing height under the fuselage. When the machine surface height remains unchanged, the coal passing height can be further increased. Since the large gear meshes with the driving wheel with a smaller diameter, the traveling mechanism has a larger transmission ratio. Therefore, the sizes of the relevant structures of the shearer traction system as the front-stage transmission system can be smaller and the service life can be longer. At the same time, due to the multi-gear transmission of the driving wheel through the large gear to the traveling wheel, compared with the direct driving of the driving wheel to the traveling wheel, the gear service life can be greatly improved.

[0069] The driving wheel shaft and the traveling wheel shaft are rotatably supported on the traveling box housing through bearings. The large gear is connected to the traveling wheel through a spline and is axially fixed to each other. The traveling wheel is sleeved on the traveling wheel shaft, and the middle part in the axial direction of the traveling wheel is connected to the traveling wheel shaft through a spline, and no axial limit is provided between the two. There is a clearance fit between the two ends of the traveling wheel and the traveling wheel shaft, and the traveling wheel can slide axially along the traveling wheel shaft flexibly. Therefore, the adaptability of the traveling wheel to the track can be improved. After the traveling wheel and the traveling wheel shaft adopt this connection structure, the diameter of the traveling wheel can be set smaller, so that a lower machine surface height and better adaptability can be maintained.

[0070] In order to ensure sufficient lubrication at the spline connection between the traveling wheel and the traveling wheel shaft, front oil holes and rear oil holes can be provided inside the traveling wheel shaft and / or the traveling wheel. The external openings of the oil holes are provided on the corresponding end faces of the traveling wheel shaft and / or the traveling wheel. The front oil holes and the rear oil holes are respectively connected to the spline connection from the front and the rear.

[0071] Due to the setting of the high-speed section speed reduction mechanism with a large reduction ratio, the size of the intermediate section speed reduction mechanism can be reduced. Correspondingly, the size of the integral driving wheel can also be reduced. The reduction in the sizes of the integral driving wheel and the traveling wheel helps to further reduce the height difference between the driving wheel shaft and the traveling wheel shaft, making it possible to use a traveling box with a double-shaft structure for shearers in thin coal seams or extremely thin coal seams with a very low machine surface height. This not only improves the service life of the traveling mechanism but also finally solves the problem of insufficient coal passing height under the fuselage well.

[0072] The present invention constitutes a traveling box with a double-shaft structure (including a driving wheel shaft and a traveling wheel shaft). Compared with the existing traveling box with a single-shaft structure (only a driving wheel shaft, on which a traveling wheel is directly installed), the traveling wheel can be smaller, and a common involute tooth profile can be used for the tooth profile, which is beneficial to achieving a sufficiently large coal passing height and ensuring the normal meshing of the traveling system with the scraper conveyor track.

Claims

1. A traction system for a thin coal seam shearer, characterized in that: it includes a traction housing, a high-speed stage reduction mechanism, an intermediate stage reduction mechanism and a traction motor. The traction housing is in an L shape, including a front-back extension section and a left-right extension section. The traction motor and the high-speed stage reduction mechanism are arranged in the front-back extension section, and the intermediate stage reduction mechanism is arranged in the left-right extension section. The output shaft of the traction motor is coaxially and fixedly connected to the input end of the high-speed stage reduction mechanism. The high-speed stage reduction mechanism adopts a compact planetary mechanism. The intermediate stage reduction mechanism is a fixed-axis transmission gear set, including a head-end gear assembly, an intermediate gear assembly and a tail-end gear assembly arranged in sequence according to the transmission direction. The axes of each are arranged in parallel. The input end of the head-end gear assembly is coaxially and fixedly connected to the output end of the high-speed stage reduction mechanism. One or more transmission shafts are included in the intermediate gear assembly. The output end of the intermediate stage reduction mechanism is closer to the end of the left-right extension section away from the front-back extension section than the input end.

2. The traction system for a thin coal seam shearer according to claim 1, characterized in that: a high-torque braking mechanism is provided at the end of the rotating shaft of the head-end gear assembly.

3. The traction system for a thin coal seam shearer according to claim 1, characterized in that: only the necessary installation space and necessary process holes for the intermediate gear assembly are reserved in the left-right extension section, and the rest are made into a solid body.

4. The traction system for a thin coal seam shearer according to claim 1, 2 or 3, characterized in that: the thickness of the left-right extension section is less than that of the front-back extension section, and the middle and rear sections of the bottom surface of the left-right extension section are set as a concave surface that is concave in the middle in the front-back direction.

5. The traction system for a thin coal seam shearer according to claim 4, characterized in that: the middle and rear sections of the top surface of the left-right extension section are set as an inclined surface that is higher in the front and lower in the rear.

6. The traction system for a thin coal seam shearer according to claim 1, 2 or 3, characterized in that: It further includes a traveling mechanism, which comprises a traveling box housing, a driving wheel, a driving wheel shaft, a traveling wheel assembly, a traveling wheel shaft and a guiding sliding shoe. The traveling box housing is fixed on the rear outer wall of the traction housing. The front end of the driving wheel shaft is coaxially and fixedly connected to the output end of the intermediate-stage reduction mechanism. The driving wheel shaft passes backward through the traction housing and the traveling box housing and is rotatably supported on the front and rear side walls of the traveling box housing. The driving wheel is coaxially fixed on the driving wheel shaft. The two ends of the traveling wheel shaft are respectively rotatably supported on the front and rear side walls of the traveling box housing. The large gear in the traveling wheel assembly is coaxially fixedly connected to the traveling wheel. The traveling wheel is coaxially installed on the traveling wheel shaft. The large gear is externally meshed with the driving wheel. The guiding sliding shoe includes a base and an ear seat located above the base. The base includes a front side wall, a rear side wall and a top plate connected between the front and rear side walls. A barb is provided at the bottom of the front side wall or the rear side wall. At the left and right ends of the base, a left-right extending guiding groove is respectively formed by the front side wall, the top plate, the rear side wall and the barb. The guiding sliding shoe is installed at the lower part of the traveling box and is swingably connected to the traveling box housing through an ear hole on its ear seat. The axis of the traveling wheel shaft coincides with the center line of the ear hole. The guiding sliding shoe is provided with a recessed surface recessed inwardly towards the inside of the base at each of the left and right sides. The recessed surface is located at least at one of the following positions: the left and right side surfaces of the ear seat, the left and right top surfaces of the base separated by the ear seat, and the transition connection between the left and right sides of the ear seat and the top surface of the base. The driving wheel shaft is arranged radially close to the recessed surface. In the left-right direction, the driving wheel shaft is located between the ear seat and one of the guiding grooves.

7. The shearer traction system for thin coal seams according to claim 4, characterized in that: It further includes a traveling mechanism, which comprises a traveling box housing, a driving wheel, a driving wheel shaft, a traveling wheel assembly, a traveling wheel shaft and a guiding slide shoe. The traveling box housing is fixed on the rear outer wall of the traction housing. The front end of the driving wheel shaft is coaxially and fixedly connected to the output end of the intermediate-stage speed reduction mechanism. The driving wheel shaft passes backward through the traction housing and the traveling box housing and is rotatably supported on the front and rear side walls of the traveling box housing. The driving wheel is coaxially fixed on the driving wheel shaft. The two ends of the traveling wheel shaft are respectively rotatably supported on the front and rear side walls of the traveling box housing. The large gear in the traveling wheel assembly is coaxially fixedly connected to the traveling wheel. The traveling wheel is coaxially mounted on the traveling wheel shaft. The large gear is externally meshed with the driving wheel. The guiding slide shoe includes a base and an ear seat located above the base. The base includes a front side wall, a rear side wall and a top plate connected between the front and rear side walls. A barb is provided at the bottom of the front side wall or the rear side wall. At the left and right ends of the base, a left-right extending guiding groove is respectively formed by the front side wall, the top plate, the rear side wall and the barb. The guiding slide shoe is mounted on the lower part of the traveling box and is swingably connected to the traveling box housing through an ear hole on its ear seat. The axis of the traveling wheel shaft coincides with the center line of the ear hole. There are two concave surfaces recessed inwardly towards the inside of the base on the guiding slide shoe, and the concave surfaces are located at least at one of the following positions: the left and right side surfaces of the ear seat, the left and right top surfaces of the base separated by the ear seat, and the transition joints between the left and right sides of the ear seat and the top surface of the base. The driving wheel shaft is arranged radially close to the concave surface, and in the left-right direction, the driving wheel shaft is located between the ear seat and one of the guiding grooves.

8. The shearer traction system for thin coal seams according to claim 5, characterized in that: It further includes a traveling mechanism, which comprises a traveling box housing, a driving wheel, a driving wheel shaft, a traveling wheel assembly, a traveling wheel shaft and a guiding sliding shoe. The traveling box housing is fixed on the rear outer wall of the traction housing. The front end of the driving wheel shaft is coaxially and fixedly connected with the output end of the intermediate-stage reduction mechanism. The driving wheel shaft passes through the traction housing and the traveling box housing backward and is rotatably supported on the front and rear side walls of the traveling box housing. The driving wheel is coaxially fixed on the driving wheel shaft. The two ends of the traveling wheel shaft are respectively rotatably supported on the front and rear side walls of the traveling box housing. The large gear in the traveling wheel assembly is coaxially fixedly connected with the traveling wheel. The traveling wheel is coaxially installed on the traveling wheel shaft. The large gear is externally meshed with the driving wheel. The guiding sliding shoe includes a base and an ear seat located above the base. The base includes a front side wall, a rear side wall and a top plate connected between the front and rear side walls. Hooks are provided at the bottom of the front side wall or the rear side wall. At the left and right ends of the base, a guiding groove extending left and right is respectively formed by the front side wall, the top plate, the rear side wall and the hook. The guiding sliding shoe is installed at the lower part of the traveling box and is swingably connected with the traveling box housing through the ear hole on its ear seat. The axis of the traveling wheel shaft coincides with the center line of the ear hole. The guiding sliding shoe is provided with a concave surface recessed inwardly towards the inside of the base at each of the left and right sides. The concave surface is located at least at one of the following positions: the left and right side surfaces of the ear seat, the left and right top surfaces of the base separated by the ear seat, and the transition connection between the left and right sides of the ear seat and the top surface of the base. The driving wheel shaft is arranged radially close to the concave surface. In the left and right directions, the driving wheel shaft is located between the ear seat and one of the guiding grooves.

9. The traction system of a thin-seam coal shearer according to claim 6, characterized in that: The middle part of the traveling wheel in the axial direction is connected with the traveling wheel shaft by splines, and there is an axial clearance fit between the two ends of the traveling wheel and the traveling wheel shaft.

10. The traction system of a thin-seam coal shearer according to claim 9, characterized in that: The driving wheel and the driving wheel shaft are of an integral structure.

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