A type of underground mine rail car

Abstract

This invention discloses an underground mine car with rails, including a transport frame. Two sets of rail wheelsets are rotatably mounted on the bottom of the transport frame. Each set of rail wheelsets consists of a rail wheel and an axle. A mine car auxiliary device is installed on the bottom of the transport frame, positioned between the two sets of rail wheelsets and cooperating with the rails. The mine car auxiliary device includes a connecting beam parallel to the axles and auxiliary mechanisms symmetrically arranged at both ends of the connecting beam. The main structure of the auxiliary mechanism is a connector fixedly connected to both ends of the connecting beam. Each connector has symmetrically arranged clamping wheel sets on its left and right sides for clamping the rails. The clamping force between the two clamping wheel sets and the rails is adjusted by elastic limiting members disposed within the connectors. This invention enhances the stability and safety of the mine car running on the rails by cooperating with the clamping wheel sets on the sides of the rails, effectively preventing derailment accidents.

Description

Technical Field

[0001] This invention relates to the field of mining equipment technology, and more specifically to a coal mine underground railcar. Background Technology

[0002] Mining cars in underground coal mines are indispensable transportation equipment, and their safe and stable operation is of great significance to the efficiency and safety of coal mine production. As coal mining depths continue to increase and the underground environment becomes more complex, higher requirements are placed on the stability and safety of mining cars.

[0003] Currently, underground mine cars mainly consist of a transport frame and track wheelsets, achieving movement on the track through the interaction of the track wheelsets and the track. For example, CN222793495U discloses a track clamping device including a clamping assembly and a mine car track assembly. The clamping assembly includes a load-bearing frame and a protective top cover. The load-bearing frame contains symmetrically installed clamping hydraulic cylinders, which control the clamping slider to engage with the mine car track assembly. This structure allows for continuous movement between the mine car and the mine car track assembly, but its clamping mechanism is relatively complex and requires hydraulic system support, increasing the difficulty of equipment maintenance.

[0004] CN118877025A also discloses a track clamping device, whose structure is similar to the aforementioned device. It uses a clamping hydraulic cylinder to control the clamping slider to engage with the mine car track, achieving a stable connection between the mine car and the track. While this device is easy to operate, its reliance on a hydraulic system makes it susceptible to interference in the complex underground environment, and its relatively complex structure makes routine maintenance difficult.

[0005] Traditional mine car structures, such as the tipper mine car disclosed in CN204383468U, include a car body, a frame, and wheels, with rail wheels fixed at both ends of the car body. This structure is simple, but lacks an effective anti-derailment mechanism, making it prone to derailment accidents in the complex underground environment, affecting transportation efficiency and safety.

[0006] To address the safety concerns of mine car operation, CN117818542A discloses an emergency stop system for inclined shaft mine cars. This system uses speed sensors installed on the track wheels. When a mine car exceeds its speed limit, limiting and squeezing components press against the track wheels, causing them to rub tightly against the sidewall of the transport track, thus restricting the car's speed. While this system primarily addresses the issue of mine car overspeeding, its ability to prevent derailment is relatively limited.

[0007] CN120003555A discloses an intelligent mining car for emergency use in underground mines. It utilizes a clamping rod on the outer side of the track for tightening and a track wheel on the inner side for outward expansion, enabling the mining car to decelerate rapidly on the track. This device primarily addresses the braking problem of mining cars, but its structure is complex and mainly intended for emergency situations, making it unsuitable for the derailment prevention needs of daily operation.

[0008] Existing underground mine cars have the following problems: First, they are prone to derailment during operation, especially in areas with curved, uneven, or sloping tracks. The unstable contact between the track wheels and the track easily leads to derailment, affecting transportation efficiency and safety. Second, existing mine cars lack effective auxiliary devices to maintain stable operation on the track, relying mostly on complex hydraulic or electrical control systems, which increases the difficulty of equipment maintenance and the failure rate. Third, the existing mine car structure is not conducive to connecting and splicing multiple cars, limiting transportation capacity and failing to meet large-scale transportation needs. Fourth, existing anti-derailment devices are mostly rigid structures lacking buffer mechanisms, making them susceptible to damage from excessive impact during mine car operation, reducing the service life of the devices.

[0009] Therefore, there is an urgent need for a coal mine underground railcar that is simple in structure, easy to maintain, has good anti-derailment function, and is easy to assemble, so as to improve the stability and safety of mine car operation and meet the actual needs of underground coal mine transportation. Summary of the Invention

[0010] To address the technical problems of existing underground mine railcars in coal mines, such as high impact forces during start-up and shutdown or on unstable tracks, which easily lead to derailment, lack of effective auxiliary devices to maintain stable operation, and inconvenience in connecting and splicing multiple carriages, a new underground mine railcar is proposed. This minecar can effectively prevent derailment, improve operational stability and safety, and facilitate the connection of multiple carriages, thereby improving transportation efficiency.

[0011] To achieve the above objectives, the present invention provides the following technical solution:

[0012] A coal mine underground rail car includes a transport frame. Two sets of rail wheelsets are rotatably mounted on the bottom of the transport frame. Each set of rail wheelsets consists of a rail wheel and an axle. A mine car auxiliary device is installed on the bottom of the transport frame. The mine car auxiliary device is located in the middle of the two sets of rail wheelsets and cooperates with the rail. The mine car auxiliary device includes a connecting beam parallel to the axle and auxiliary mechanisms symmetrically arranged at both ends of the connecting beam. The main structure of the auxiliary mechanism is a connector fixedly connected to both ends of the connecting beam. The connector consists of an upper fixing plate and a lower fixing plate arranged parallel to each other. The front and rear sides of the upper fixing plate and the lower fixing plate are fixedly connected by side fixing plates. The bottom surface of each lower fixing plate is fixedly connected to a mounting base with a downward groove that fits against the top of the convex surface of the rail. Clamping wheel sets for clamping the rail are symmetrically arranged on the left and right sides of each connector. The clamping force of the two clamping wheel sets on the rail is adjusted by an elastic limiting member arranged in the connector.

[0013] Furthermore, the clamping wheel assembly includes a clamping wheel, a clamping rod, a U-shaped connector, and a sliding rod. The clamping wheel is connected to the lower end of the clamping rod, and the upper section of the clamping rod is fixedly connected to the sliding rod through the U-shaped connector. The upper and lower ends of the sliding rod are respectively engaged with the sliding grooves provided on the upper fixed plate and the lower fixed plate. The extension direction of the sliding groove is consistent with the extension direction of the track. The elastic limiting member is transversely disposed inside the connector along the wheel axle direction, and the two ends of the elastic limiting member are respectively engaged with the U-shaped connector in the clamping wheel assembly.

[0014] Furthermore, the clamping wheel assembly also includes a positioning element, which is connected to the sliding rod and disposed within the elastic limiting element, for fixing the moving direction of the clamping rod.

[0015] Furthermore, the elastic limiting component includes a limiting channel, a spring, and a limiting block. The limiting block cooperates with a slide rail disposed on the limiting channel. One end of the limiting block is connected to the spring disposed in the limiting channel, and the other end is connected to the clamping wheel assembly.

[0016] Furthermore, the slide is symmetrically arranged on the upper fixed plate and the lower fixed plate, and the slide is provided with a buffer part and a stabilizing part.

[0017] Furthermore, the groove is C-shaped.

[0018] Furthermore, the groove is "M" shaped.

[0019] Furthermore, the connector is symmetrically provided with buffer members, one end of which is connected to the side fixing plate and the other end of which is connected to the elastic limiting member.

[0020] Furthermore, the transport frame is provided with splicing structures on both sides, including a first connecting seat and a second connecting seat, for splicing and fixing between adjacent mine cars. The first connecting seat is fixed to the left side of the transport frame and is provided with a hinge joint; the second connecting seat is fixed to the right side of the transport frame and is provided with a U-shaped slot that mates with the hinge joint.

[0021] Furthermore, the mining car auxiliary device is detachably connected to the transport vehicle frame.

[0022] Due to the adoption of the above technical solution, the technical progress achieved by this invention includes the following aspects:

[0023] 1. The present invention connects the auxiliary mechanisms on both sides through the connecting beam. The clamping wheel group in the auxiliary mechanism clamps the side of the track. The slide groove is provided with the stabilizing part and the buffer part, which cooperate with the limiting channel of the limiting member. It can adaptively adjust along the extension direction of the track and compensate for track deviation in the vertical direction. It always maintains the clamping force on the side of the track, can adapt to the unevenness and curvature of the track, effectively prevent the mine car from derailing, and improve the stability and safety of operation.

[0024] 2. In this invention, the clamping wheel assembly is configured to cooperate with the sliding groove and the limiting channel via the sliding rod. The limiting component contains the spring and the limiting block, and the connecting component contains the buffer component, collectively forming a buffer system. The spring and the buffer component provide buffering force simultaneously in both the vertical and horizontal directions. When the mine car passes through track joints or uneven sections, the clamping wheel assembly adjusts its gripping force on the track by sliding in multiple directions through the sliding groove and the limiting channel, increasing friction and making the mine car run more smoothly. The spring and the buffer component absorb vibration and impact forces in real time, preventing the clamping wheel assembly from moving too fast due to excessive impact force inertia, which could cause it to lock up and derail. Furthermore, it can automatically adjust the clamping force according to track deformation, solving the problem of swaying caused by track wear or deformation in traditional mine cars and improving the running stability of the mine car under harsh working conditions.

[0025] 3. The present invention facilitates the connection of multiple mining cars through the splicing structure design, thereby improving transportation efficiency and loading capacity; the mining car auxiliary device is detachably connected to the transport frame, which facilitates maintenance and replacement. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the main structure of the mining car described in this invention;

[0028] Figure 2 This is a schematic diagram of the main view of the bottom surface of the mine car according to the present invention;

[0029] Figure 3 This is a top view of the auxiliary mechanism described in this invention.

[0030] Figure 4 This is a schematic cross-sectional view of the auxiliary mechanism described in this invention;

[0031] Figure 5 This is a schematic diagram of the main structure of the auxiliary mechanism described in this invention;

[0032] Figure 6 This is a top view of the "M"-shaped slide of the auxiliary mechanism described in this invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1-Transport vehicle frame, 2-Mine car auxiliary device, 3-Connecting beam, 4-Auxiliary mechanism, 5-Mounting base, 6-Connector, 601-Upper fixing plate, 602-Lower fixing plate, 603-Side fixing plate, 7-Clamping wheel set, 701-Clamping wheel, 702-Clamping rod, 703-Sliding rod, 704-U-shaped connector, 705-Positioning component, 8-Limiting component, 801-Spring, 802-Limiting block, 9-Slide groove, 901-Buffer part, 902-Stabilizing part, 10-Limiting channel, 11-Buffer component, 12-First connecting seat, 13-Second connecting seat. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, in the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes rather than for limiting purposes, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art should understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary details.

[0036] This invention provides an underground mine railcar for coal mines, the specific structure of which is shown in the appendix to the specification. Figures 1 to 6 The specific implementation is as follows.

[0037] Example 1

[0038] A coal mine underground railcar includes a transport frame 1. Two rail wheelsets are rotatably mounted on the bottom of the transport frame 1, each rail wheel pair consisting of a rail wheel and an axle. The transport frame 1 is made of high-strength steel and has sufficient load-bearing capacity to meet the transportation needs of underground coal mines. The rail wheelsets are installed at the front and rear ends of the bottom of the transport frame 1. The rail wheels are made of wear-resistant alloy material, and the axles are made of high-strength steel. The rail wheels are connected to the axles through bearings to ensure smooth rotation of the rail wheels.

[0039] A mine car auxiliary device 2 is installed at the bottom of the transport frame 1. The mine car auxiliary device 2 is located in the middle of the two track wheelsets and cooperates with the track. The mine car auxiliary device 2 includes a connecting beam 3 parallel to the wheel axle and auxiliary mechanisms 4 symmetrically arranged at both ends of the connecting beam 3. The connecting beam 3 is made of high-strength steel and has sufficient rigidity to ensure that the auxiliary mechanisms 4 on both sides maintain a relatively fixed positional relationship.

[0040] The main structure of the auxiliary mechanism 4 is a connector 6 fixedly connected to both ends of the connecting beam 3. The connector 6 consists of an upper fixing plate 601 and a lower fixing plate 602 arranged parallel to each other. The front and rear sides of the upper fixing plate 601 and the lower fixing plate 602 are fixedly connected by side fixing plates 603. Each lower fixing plate 602 has a mounting base 5 with its groove facing downwards and fitting against the top of the track's convex surface. The mounting base 5 is made of high-strength steel and has a groove matching the track's convex surface, ensuring that the mounting base 5 can stably fit against the track. The connector 6 is fixedly installed on top of the mounting base 5, increasing the contact area between the mine car and the track, improving operational stability, and providing support for the clamping wheel assembly 7. The connector 6 consists of an upper fixing plate 601 and a lower fixing plate 602 arranged parallel to each other, and the front and rear sides of the upper fixing plate 601 and the lower fixing plate 602 are fixedly connected by side fixing plates 603, forming a stable frame structure. Both the upper fixing plate 601 and the lower fixing plate 602 are made of high-strength steel and are fixed together with the side fixing plate 603 by welding to provide support for the clamping wheel assembly 7.

[0041] Each connector 6 has symmetrically arranged clamping wheel sets 7 on both its left and right sides for clamping the track. The clamping force between the two clamping wheel sets 7 is adjusted by elastic limiting members 8 set in the connector 6. This can adapt to different track conditions and prevent the mine car from lateral deviation or derailment during operation.

[0042] The clamping wheel assembly includes a clamping wheel 701, a clamping rod 702, a U-shaped connector 704, and a sliding rod 703. The clamping wheel 701 is connected to the lower end of the clamping rod 702. The upper section of the clamping rod 702 is fixedly connected to the sliding rod 703 via the U-shaped connector 704. The upper and lower ends of the sliding rod 703 are respectively engaged with the sliding grooves 9 provided on the upper fixed plate 601 and the lower fixed plate 602. The extension direction of the sliding grooves 9 is consistent with the extension direction of the track. An elastic limiting member 8 is transversely disposed inside the connector 6 along the wheel axle direction. The two ends of the elastic limiting member 8 are respectively engaged with the U-shaped connector 704 inside the clamping wheel assembly 7. The clamping wheel 701 is made of wear-resistant rubber material, which has good elasticity and wear resistance, and can effectively clamp the side of the track, reducing the shaking of the mine car during operation. The clamping wheel 701 is connected to the U-shaped connector 704 and the sliding rod 703 via the clamping rod 702. The sliding rod 703 is engaged in the grooves 9 of the upper fixed plate 601 and the lower fixed plate 602, allowing it to move along the track extension direction to adapt to track curvature and unevenness. The elastic limiting member 8 extends laterally through the interior of the connector 6 and engages with the U-shaped connector 704 of the clamping wheel assembly 7, providing appropriate elastic support to keep the clamping force of the clamping wheel assembly on the track within a suitable range.

[0043] The clamping wheel assembly 7 also includes a positioning element 705, which is connected to the sliding rod 703 and disposed within the elastic limiting element 8, for fixing the moving direction of the clamping rod 702. The positioning element 705 further enhances the stability of the moving direction of the clamping rod 702, preventing the clamping wheel assembly 7 from shifting during operation and ensuring the clamping effect.

[0044] The elastic limiting component 8 includes a limiting channel 10, a spring 801, and a limiting block 802. The limiting block 802 cooperates with a slide rail disposed on the limiting channel 10. One end of the limiting block 802 is connected to the spring 801 disposed within the limiting channel 10, and the other end is connected to the clamping wheel assembly 7. The design of the elastic limiting component 8 allows for automatic adjustment of the clamping force. As the limiting block 802 moves on the slide rail of the limiting channel 10, the spring 801 provides appropriate elastic force, enabling the clamping wheel assembly 7 to automatically adjust its position and clamping force according to the track conditions.

[0045] The chute 9 is symmetrically arranged on the upper fixed plate 601 and the lower fixed plate 602. The chute 9 is provided with a buffer part 901 and a stabilizing part 902. The sliding rod 703 moves from the stabilizing part 902 to the buffer part 901, and at the same time moves from both ends to the middle within the elastic limiting member 8. It drives the clamping wheel 701 to clamp the track through the U-shaped connector 704 and the clamping rod 702, thereby increasing the friction. It can effectively cope with the impact force of the mine car starting and stopping, as well as the unevenness and bending of the track.

[0046] A buffer 1 is symmetrically arranged inside the connector 6. One end of the buffer 11 is connected to the side fixing plate 603, and the other end is connected to the elastic limiting member 8. The buffer 11 is made of elastic material and forms a stable structure with the limiting member 8. It can absorb the vibration and impact generated during the operation of the mine car and prevent the sliding rod 703 from moving too fast inside the elastic limiting member 8, which would cause the clamping wheel set to lock up the track.

[0047] The transport frame 1 has splicing structures on both sides, including a first connecting seat 12 and a second connecting seat 13, for splicing and fixing adjacent devices. The first connecting seat 12 is fixed to the left side of the mobile splicing platform and has a hinge joint; the second connecting seat 13 is fixed to the right side of the mobile splicing platform and has a U-shaped slot that mates with the hinge joint. Both the first connecting seat 12 and the second connecting seat 13 are made of high-strength steel and are fixed to the transport frame 1 by welding or bolting. The hinge joint and the U-shaped slot are designed to cooperate with each other to ensure a stable connection between adjacent mine cars, while retaining a certain amount of room for movement to accommodate the curvature and unevenness of the track.

[0048] The mine car auxiliary device 2 is detachably connected to the transport frame 1. This design allows the mine car auxiliary device 2 to be installed or removed as needed, facilitating the maintenance and repair of the mine car. The mine car auxiliary device 2 is connected to the transport frame 1 by bolts, making it easy to assemble and disassemble and simple to operate.

[0049] During operation, the mine car travels on the track via the track wheelsets. The mounting base 5 of the mine car auxiliary device 2 fits against the top of the convex surface of the track, and the clamping wheels 701 of the clamping wheel set 7 clamp the side of the track, limiting the lateral sway of the mine car. When the mine car encounters uneven or curved tracks, or experiences impact forces different from those experienced during normal operation, the clamping wheel set 7 can be adjusted by sliding within the slide groove 9 and the limiting channel 10. The sliding rod 703 slides from the stabilizing part 902 of the slide groove 9 to the buffer part 901. Simultaneously, the sliding rod 703 slides from both sides towards the center within the limiting channel 10, and through the U-shaped connector 704 and the clamping rod 702, it drives the clamping wheel 701 to move towards the side of the track. This increases the clamping pressure of the clamping wheel set 7 on the side of the track, increasing friction, thereby absorbing impact forces, adapting to changes in the track, and ensuring the smooth travel of the mine car. The buffer 11 and spring 801 can absorb the vibration and impact generated during the operation of the mine car, reduce the impact of these vibrations and impacts on the mine car structure, and extend the service life of the mine car. At the same time, the buffer 11 and the limiting member 8 form a stable structure, providing support for the limiting member 8 and providing greater buffering force, making the sliding rod 703 slide more smoothly in the limiting channel 10. This makes the sliding rod 703 move more smoothly from the stabilizing part 902 of the slide groove 9 to the buffer part 901. The clamping force of the clamping wheel set 7 on the side of the track gradually increases to prevent locking. When the travel is smooth, under the action of the buffer 11 and spring 801, the sliding rod 703 is driven to slide from the middle position of the limiting channel 10 to both sides. The sliding rod 703 drives the clamping wheel set 7 to move, which reduces the clamping force of the clamping wheel set 7 on the side of the track. At the same time, the sliding rod 703 slides from the buffer part 901 of the slide groove 9 to the stabilizing part 902.

[0050] Example 2

[0051] Based on Embodiment 1, the chute 9 is "C" shaped. The "C" shaped chute 9 has a smoother transition and can provide a better buffering effect when the mine car is running at high speed or the track condition is poor, making the mine car more stable.

[0052] Example 3

[0053] Based on Embodiment 1, the chute 9 is "M" shaped. The "M" shaped chute 9 has more buffer stroke and smoother transition. Multiple buffer parts 901 and stabilizing parts 902 form multi-level buffering, gradually decelerating and better reducing the damage caused by impact force to the mine car, making the mine car more stable.

[0054] Example 4

[0055] Based on Embodiment 1, the buffer 11 adopts a hydraulic buffer, which is filled with a high-viscosity liquid, providing a more stable buffering effect. The buffering force of the hydraulic buffer can be automatically adjusted according to the magnitude of the impact force, providing greater buffering force when the mine car is running at high speed or the track condition is poor, and providing less buffering force when the mine car is running at low speed or the track condition is good, so that the mine car can travel smoothly under various conditions.

[0056] It should be noted that Embodiment 1, Embodiment 2, Embodiment 3, and Embodiment 4 are all types of underground mine railcars in coal mines.

[0057] In this patent application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A coal mine underground railcar, comprising a transport frame (1), wherein two sets of rail wheelsets are rotatably mounted on the bottom of the transport frame (1), the two sets of rail wheelsets being composed of rail wheels and axles respectively, characterized in that, The bottom of the transport frame (1) is equipped with a mine car auxiliary device (2). The mine car auxiliary device (2) is located in the middle of two sets of track wheelsets and cooperates with the track. The mine car auxiliary device (2) includes a connecting beam (3) parallel to the wheel axle and auxiliary mechanisms (4) symmetrically arranged at both ends of the connecting beam (3). The main structure of the auxiliary mechanism (4) is a connector (6) fixedly connected to both ends of the connecting beam (3). The connector (6) is composed of an upper fixing plate (601) and a lower fixing plate (602) arranged in parallel. The upper fixing plate (601) and the lower fixing plate (602) are fixedly connected on the front and rear sides by side fixing plates (603). The bottom surface of each lower fixing plate (602) is fixedly connected to a mounting base (5) with the slot facing downward and in contact with the top of the convex surface of the track. Each connector (6) has symmetrical clamping wheel sets (7) for clamping the track on the left and right sides. The clamping force of the two clamping wheel sets (7) on the track is adjusted by the elastic limiting member (8) set in the connector (6). The clamping wheel assembly includes a clamping wheel (701), a clamping rod (702), a U-shaped connector (704), and a sliding rod (703). The clamping wheel (701) is connected to the lower end of the clamping rod (702). The upper section of the clamping rod (702) is fixedly connected to the sliding rod (703) through the U-shaped connector (704). The upper and lower ends of the sliding rod (703) are respectively engaged with the sliding grooves (9) provided on the upper fixing plate (601) and the lower fixing plate (602). The extension direction of the sliding grooves (9) is consistent with the extension direction of the track. The elastic limiting member (8) is transversely disposed inside the connector (6) along the wheel axle direction. The two ends of the elastic limiting member (8) are respectively engaged with the U-shaped connector (704) in the clamping wheel assembly (7). The clamping wheel assembly (7) also includes a positioning element (705), which is connected to the sliding rod (703) and disposed within the elastic limiting element (8) to fix the moving direction of the clamping rod (702); The elastic limiting member (8) includes a limiting channel (10), a spring (801) and a limiting block (802). The limiting block (802) cooperates with the slide rail provided on the limiting channel (10). One end of the limiting block (802) is connected to the spring (801) provided in the limiting channel (10), and the other end is connected to the clamping wheel assembly (7). The groove (9) is either "C" type or "M" type.

2. A coal mine underground railcar according to claim 1, characterized in that, The slide (9) is symmetrically arranged on the upper fixed plate (601) and the lower fixed plate (602), and the slide (9) is provided with a buffer part (901) and a stabilizing part (902).

3. A coal mine underground railcar according to claim 1, characterized in that, The connector (6) is symmetrically provided with buffer members (11), one end of which is connected to the side fixing plate (603) and the other end is connected to the elastic limiting member (8).

4. A coal mine underground railcar according to claim 1, characterized in that, The transport frame (1) has splicing structures on both sides, including a first connecting seat (12) and a second connecting seat (13), for splicing and fixing between adjacent mine cars. The first connecting seat (12) is fixed to the left side of the transport frame (1) and has a hinge joint; the second connecting seat (13) is fixed to the right side of the transport frame (1) and has a U-shaped slot that cooperates with the hinge joint.

5. A coal mine underground railcar according to claim 1, characterized in that, The mining car auxiliary device (2) is detachably connected to the transport vehicle frame (1).

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