Coal mine transportation reversed loader

By designing the rotatable supporting rack and a walking wheel on both sides of the track, the problem of mobility instability caused by geological changes caused by geological changes of coal mines is solved, and stability and movement efficiency are improved. And security.

CN222388952UActive Publication Date: 2025-01-24SHANXI TIANDI WANGPO COAL IND CO LTD
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Patent Information

Application Number
CN202421250604.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-03
Publication Date
2025-01-24
Estimated Expiration
2034-06-03

AI Technical Summary

Technical Problem

During the movement of the coal mine transportation relay machine, the track deforms due to geological changes, causing the relay machine to fluctuate up and down, swing left and right, and may even deviate from the track, affecting normal work and safety.

Method used

Designed a kind of coal mines transport reproductive machine, using body body and mobile components to support the rotation of the body's body. To 40cm, improve stability and movement efficiency.

Benefits of technology

Through the design of the supporting rack and the walking wheel, the movement stability of the reprint machine is improved, and the situation of the running wheel is biased or separated from the track, ensuring the smooth progress of the coal mine mining process and the safety of the staff.

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Abstract

The utility model provides a coal mine transportation reversed loader which comprises a vehicle body and a moving assembly, and a plurality of transportation units are arranged on the vehicle body. The moving assembly comprises a supporting frame and walking wheels, one end of the supporting frame is connected to the vehicle body, the other end of the supporting frame is connected to the walking wheels, the supporting frame can rotate relative to the vehicle body, the walking wheels are arranged on the two sides of a track in the coal mine tunnel in a striding mode, and the difference value between the wheel distance of the walking wheels and the track gauge of the track in the coal mine tunnel ranges from 10 cm to 40 cm. According to the coal mine transportation reversed loader, the stability and the moving efficiency of the reversed loader can be improved, various problems caused by the fact that the track wheels deviate or are separated from the track are reduced, and therefore the smooth proceeding of the coal mining process is guaranteed.
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Description

Technical Field

[0001] The utility model relates to the technical field of coal mine transportation technology, in particular to a coal mine transportation transfer machine. Background Art

[0002] In the coal mining industry, the transfer machine is one of the indispensable and important equipment in the coal production line. Its main function is to efficiently and stably transfer the coal excavated by the tunnel boring machine to the subsequent transportation equipment to ensure the continuity and efficiency of the coal mining process.

[0003] In the related art, the transfer machine mainly moves along the preset track in the coal mine tunnel by means of track wheels. However, due to the complexity and variability of the geological conditions in the coal mine, the track in the tunnel often deforms or moves due to geological changes, which may cause the transfer machine to fluctuate up and down or swing left and right during movement, and even cause the track wheels of the transfer machine to deviate or fall off the track, which will not only seriously affect the normal operation of the transfer machine, but also pose a threat to the safety of the staff. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, a coal mine transport transfer machine is proposed in the embodiment of the utility model, which can improve the stability and movement efficiency of the transfer machine, reduce various problems caused by the deviation of the track wheel or the separation of the track, thereby ensuring the smooth progress of the coal mining process.

[0005] The coal mine transport transfer machine provided by the embodiment of the utility model includes a vehicle body and a moving component, wherein the vehicle body is provided with a plurality of transport units; the moving component includes a support frame and traveling wheels, wherein one end of the support frame is connected to the vehicle body, and the other end of the support frame is connected to the traveling wheels, the support frame is rotatable relative to the vehicle body, the traveling wheels are straddled on both sides of the track in the coal mine tunnel, and the difference between the wheelbase of the traveling wheels and the track gauge of the track in the coal mine tunnel is 10 cm to 40 cm.

[0006] The coal mine transport transfer machine provided by the embodiment of the utility model has a support frame that rotates relative to the vehicle body and running wheels that are arranged on both sides of the track in the coal mine tunnel. This not only provides the mobile stability of the transport transfer machine, but also reduces the occurrence of the running wheels running off the track or leaving the track, thereby providing a strong guarantee for the smooth progress of the coal mining process.

[0007] In some embodiments, one of the vehicle body and the support frame is provided with a rotating seat, the other of the vehicle body and the support frame is provided with a rotating shaft, the rotating seat is provided with a rotating hole, the rotating hole is arranged at the middle position of the rotating seat in the left and right directions of the vehicle body, and the rotating shaft is detachably inserted into the rotating hole.

[0008] In some embodiments, the rotating seat is arranged on the support frame, and the support frame also includes a first support and a second support arranged opposite to each other, one of the first support and the second support is connected to the rotating seat, the walking wheel has a wheel axle, the wheel axle is arranged between the first support and the second support, and a connecting member is provided between the first support and the second support.

[0009] In some embodiments, the first support and the second support are both provided with a groove, and the groove matches the outer shape of the axle;

[0010] And / or, the connecting member is configured as a bolt.

[0011] In some embodiments, the support frame further includes at least two support rods, which are spaced apart along the left-right direction of the vehicle body, one end of the support rod is connected to the rotating seat, and the other end of the support rod is correspondingly connected to the first support or the second support.

[0012] In some embodiments, the support rod includes a sleeve and an inner rod, the inner rod is movably inserted into the sleeve, and a locking member is provided between the sleeve and the inner rod.

[0013] In some embodiments, the sleeve is provided with a fixing hole, the inner rod is provided with a plurality of positioning holes, the positioning holes are arranged at intervals along the length direction of the inner rod, and the locking piece is passed through the fixing hole and the positioning hole corresponding to the fixing hole.

[0014] In some embodiments, the support frame further comprises an elastic member, and two ends of the elastic member are correspondingly connected to the sleeve and the inner rod;

[0015] And / or, the locking member is configured as a bolt.

[0016] In some embodiments, the moving assembly further comprises a shock absorbing pad, wherein the shock absorbing pad is disposed between the vehicle body and the support frame;

[0017] And / or, the traveling wheel comprises a wheel hub and a rubber tire located on the wheel hub.

[0018] In some embodiments, the coal mine transport transfer machine further includes a brake assembly, the brake assembly includes a brake disc and a chuck, the brake disc is arranged on the travel wheel, the brake disc rotates synchronously with the travel wheel, the chuck cover is arranged on the outer side of the brake disc, the chuck is provided with a brake block, and the brake block is movable along the axial direction of the travel wheel to abut against the brake disc;

[0019] And / or, the movable components are arranged in multiple groups, and the movable components are arranged at intervals along the length direction of the vehicle body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a coal mine transport transfer machine provided by an embodiment of the utility model.

[0021] Figure 2 It is a structural schematic diagram of a mobile component in a coal mine transport transfer machine provided by an embodiment of the utility model.

[0022] Figure 3 The utility model is a schematic diagram of the structure of a mobile component in a coal mine transport transfer machine provided by an embodiment of the utility model on a track in a coal mine tunnel.

[0023] Figure 4 The utility model is a schematic diagram of the structure of the support rod in the coal mine transport transfer machine provided by the embodiment of the utility model.

[0024] Reference numerals:

[0025] 100, track; 10, vehicle body; 11, transport unit; 20, moving assembly; 21, support frame; 211, first support; 212, second support; 213, connector; 22, running wheel; 221, wheel hub; 222, rubber tire; 23, rotating seat; 231, rotating hole; 24, support rod; 241, sleeve; 242, inner rod; 243, locking piece; 244, fixing hole; 245, positioning hole; 246, reinforcing rib. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0027] like Figures 1 to 4As shown, an embodiment of the utility model provides a coal mine transport transfer machine, which includes a body 10 and a moving assembly 20. The body 10 is provided with a plurality of transport units 11. The moving assembly 20 includes a support frame 21 and a running wheel 22. One end of the support frame 21 is connected to the body 10, and the other end of the support frame 21 is connected to the running wheel 22. The support frame 21 is rotatable relative to the body 10. The running wheel 22 is straddled on both sides of a track 100 in a coal mine tunnel, and the difference between the wheelbase of the running wheel 22 and the track gauge of the track 100 in the coal mine tunnel is 10 cm to 40 cm, thereby improving the stability and movement efficiency of the transfer machine, reducing various problems caused by the deviation of the track wheel or detachment from the track 100, thereby ensuring the smooth progress of the coal mining process.

[0028] In this embodiment, the vehicle body 10 serves as the main part of the transport transfer machine, and the transport unit 11 thereon can load or unload the coal excavated by the tunneling machine as needed, and transport it to subsequent equipment, such as a belt conveyor or a scraper conveyor. The moving assembly 20 serves as a moving unit of the vehicle body 10, and can drive the vehicle body 10 to move in the coal mine tunnel. In addition, the support frame 21 can rotate relative to the vehicle body 10, so that the transfer machine can still maintain a stable moving state when turning in the coal mine tunnel, avoiding the occurrence of situations such as the walking wheel 22 being separated from the track 100 in the tunnel due to angle changes.

[0029] Furthermore, the traveling wheels 22 are arranged on both sides of the track 100 in the coal mine tunnel, and the difference between the wheelbase and the track gauge of the track 100 in the tunnel is 10 cm to 40 cm, so that the traveling wheels 22 can fit the track 100 tightly while maintaining flexibility to a certain extent, thereby improving the cornering performance of the mobile component 20 and ensuring that the transfer machine can stably move along the track 100 during movement.

[0030] In summary, the coal mine transport transfer machine provided by the embodiment of the utility model not only provides the mobile stability of the transport transfer machine, but also reduces the occurrence of the travel wheel 22 running off or leaving the track 100, which provides a strong guarantee for the smooth progress of the coal mining process.

[0031] In some embodiments, the moving assembly 20 can be arranged in multiple groups, and the moving assembly 20 is arranged at intervals along the length direction of the vehicle body 10. Each group of moving assemblies 20 includes a support frame 21 and a running wheel 22, which can form a multi-point support under the vehicle body 10, ensuring that the transfer machine can be evenly stressed in the length direction. During the movement, whether it is driving in a straight line or turning, the transfer machine can maintain a stable posture, effectively avoiding shaking or deviation caused by uneven force.

[0032] Furthermore, the arrangement of multiple groups of mobile components 20 also improves the adaptability of the transfer machine. When one group of mobile components 20 encounters an obstacle or failure, the other groups of mobile components 20 can still work normally, ensuring that the transfer machine can continue to move, so that the transfer machine can also maintain a certain degree of mobility in an emergency, providing a more reliable guarantee for the coal mining process.

[0033] like Figure 1 As shown, in some embodiments, the traveling wheel 22 includes a wheel hub 221 and a rubber tire 222 located on the wheel hub 221, which not only improves the mobility of the transfer machine, but also significantly enhances its shock absorption performance, thereby ensuring the stability and safety of the transfer machine in a complex working environment.

[0034] Specifically, the wheel hub 221, as the main structure of the running wheel 22, provides sufficient strength and stability to support the weight of the transfer machine and withstand various forces during driving. The rubber tire 222 fits tightly on the wheel hub 221, which not only increases the contact area between the running wheel 22 and the ground and improves the friction, but also provides excellent shock absorption performance for the transfer machine through its unique material properties.

[0035] Furthermore, the rubber tire 222 has good elasticity and damping properties, and can effectively absorb and buffer the impact and vibration from the ground. In complex working environments such as coal mine tunnels, the rubber tire 222 can reduce the bumps and shakes caused by changes in geological conditions or improper operation during the movement of the transfer machine, thereby protecting the various components of the transfer machine from damage.

[0036] Secondly, the rubber tire 222 can provide a larger contact area and better grip, making the transfer machine more stable and reliable during driving, and reducing safety accidents caused by unexpected situations such as slipping or rollover.

[0037] In some embodiments, the moving assembly 20 further includes a shock-absorbing pad, which is disposed between the vehicle body 10 and the support frame 21, thereby improving the stability and shock-absorbing performance of the transfer machine during movement. The shock-absorbing pad is disposed between the vehicle body 10 and the support frame 21, and an elastic connection is formed, so that when the transfer machine is moving, especially when encountering impacts caused by changes in geological conditions or improper operation, the shock-absorbing pad can absorb and disperse these impact forces, thereby reducing damage to the entire transfer machine.

[0038] Optionally, the shock-absorbing pad can be made of materials such as rubber, foam plastic, polyurethane, etc.

[0039] like Figure 2 and Figure 3As shown, in some embodiments, one of the vehicle body 10 and the support frame 21 is provided with a rotating seat 23, and the other of the vehicle body 10 and the frame is provided with a rotating shaft. The rotating seat 23 is provided with a rotating hole 231. The rotating hole 231 is arranged at the middle position of the rotating seat 23 in the left and right directions of the vehicle body 10, and the rotating shaft is detachably inserted into the rotating hole 231, which not only facilitates the disassembly and assembly of the moving component 20, but also facilitates maintenance and replacement, and also allows the support frame 21 to be rotated and adjusted relative to the vehicle body 10 within a certain range.

[0040] In this embodiment, the rotating seat 23 is arranged on the support frame 21, and the rotating shaft is arranged on the vehicle body 10. During the installation process of the moving assembly 20, by lifting the vehicle body 10, the rotating shaft can be conveniently inserted into the rotating hole 231 of the rotating seat 23, so as to realize the quick connection between the vehicle body 10 and the support frame 21. In addition, when the vehicle body 10 is in the carrying state, the weight of the vehicle body 10 and the weight of the carried object can make the fixing of the moving assembly 20 more stable.

[0041] Furthermore, the support frame 21 further includes a first support 211 and a second support 212 which are arranged opposite to each other, one of the first support 211 and the second support 212 is connected to the rotating seat 23, the running wheel 22 has a wheel axle, the wheel axle is arranged between the first support 211 and the second support 212, and a connecting member 213 is arranged between the first support 211 and the second support 212. The first support 211 and the second support 212 can clamp the wheel axle of the running wheel 22 to ensure the stability of the connection between the wheel axle and the support frame 21, so that the wheel axle is not easy to shake or deviate.

[0042] Furthermore, the first support 211 and the second support 212 are both provided with grooves, and the grooves match the outer shape of the axle. When the axle is in the grooves of the first support 211 and the second support 212, it can be supported and fixed in all directions, and is not prone to shaking or displacement. In addition, the grooves can also facilitate the positioning and installation of the axle. During the installation of the axle, the operator only needs to align the axle with the grooves and place it, which greatly improves the installation efficiency.

[0043] Optionally, the wheel axle may be arranged in a square or polygonal shape, so as to form a close fit with the groove on the support frame 21, thereby limiting the rotation of the wheel axle relative to the support frame 21. Of course, in some embodiments, the wheel axle may also be arranged in a circular shape.

[0044] It should be noted that the connecting member 213 is configured as a bolt, and the two supports are tightly connected together through the meshing action of the thread. This connection method has high strength and stability and can withstand large loads and impact forces. Of course, in some embodiments, the connecting member 213 can be configured as a connecting pin or other components.

[0045] like Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the support frame 21 also includes at least two support rods 24, which are arranged at intervals along the left and right directions of the vehicle body 10, one end of the support rod 24 is connected to the rotating seat 23, and the other end of the support rod 24 is correspondingly connected to the first support 211 or the second support 212, which not only increases the rigidity of the support frame 21, but also helps to balance the force generated by the walking wheel 22 when moving.

[0046] Specifically, the first support 211 is located above the second support 212, and the support rod 24 is connected to the first support 211. The support rods 24 are arranged at intervals along the left and right directions of the vehicle body 10 to ensure that the support frame 21 has sufficient support strength in the lateral direction, and can effectively resist the lateral force and torque generated by the movement of the running wheel 22. Furthermore, multiple support rods 24 and the rotating seat 23 can form a door-like structure, which can improve the stability of the structure, so that the transfer machine can operate stably in a complex or heavy-load working environment, thereby improving transportation efficiency and safety.

[0047] Furthermore, the support rod 24 includes a sleeve 241 and an inner rod 242, the inner rod 242 is movably inserted into the sleeve 241, and a locking member 243 is provided between the sleeve 241 and the inner rod 242. In other words, the inner rod 242 can move freely in the sleeve 241, and the overall length of the support rod 24 can be changed by adjusting the position of the inner rod 242 in the sleeve 241, so that the support rod 24 can adapt to different terrains and height requirements.

[0048] Optionally, the locking member 243 can be configured as a bolt. Using a bolt as the locking member 243 is easy and quick to operate, and the adjustment and fixing of the support rod 24 can be completed without special tools, which reduces the difficulty of operation and maintenance costs and improves work efficiency.

[0049] Furthermore, a fixing hole 244 is provided on the sleeve 241, and a plurality of positioning holes 245 are provided on the inner rod 242. The positioning holes 245 are arranged at intervals along the length direction of the inner rod 242. The locking piece 243 is passed through the fixing hole 244 and the positioning hole 245 corresponding to the fixing hole 244, so that the length of the support rod 24 can be accurately adjusted.

[0050] Optionally, the number of the positioning holes 245 can be 2, 3, 4, etc. It should be noted that the number of the positioning holes 245 can be set as required, as long as the adjustment of the support rod 24 is convenient.

[0051] In addition, a plurality of reinforcing ribs 246 are provided between the support rod 24 and the rotating seat 23 to enhance the structural strength of the overall structure.

[0052] In some embodiments, the support frame 21 further includes an elastic member, and the two ends of the elastic member correspond to the connecting sleeve 241 and the inner rod 242. When the loader is running on a complex terrain or an uneven road surface, the support frame 21 may be impacted or vibrated, and the elastic member can effectively absorb the impact and vibration, reduce the direct effect on the support rod 24 and the inner rod 242, thereby improving the stability and durability of the support rod 24.

[0053] Optionally, the elastic member can be made of a material with good elasticity and durability, such as rubber, spring steel, etc. These materials can ensure that the elastic member quickly recovers its original shape when it is impacted or vibrated, and maintains its buffering and compensation functions.

[0054] In some embodiments, the coal mine transport transfer machine also includes a brake assembly, which includes a brake disc and a chuck. The brake disc is provided on the traveling wheel 22, and the brake disc rotates synchronously with the traveling wheel 22. The chuck cover is provided on the brake disc, and a brake block is provided on the chuck. The brake block can be moved along the axial direction of the traveling wheel 22 to abut against the brake disc, thereby effectively stopping or slowing down the movement of the transfer machine.

[0055] Specifically, the running wheels include a left wheel and a right wheel, and the left wheel and the right wheel are both provided with a brake assembly. When the transport transfer machine is turning, the left wheel or the right wheel can be braked by the brake assembly to reduce the turning radius and improve the turning performance of the mobile assembly 20.

[0056] Furthermore, the brake assembly also includes a driver, which is used to drive the brake block to move relative to the chuck to abut against or move away from the brake disc.

[0057] Optionally, the driver can be configured as a hydraulic driver, a pneumatic driver or a motor driver. That is to say, in practical applications, a suitable driver type can be selected as needed to meet different work requirements.

[0058] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "inside", "outside", "axial", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0062] In the present invention, the terms "one embodiment", "some embodiments", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0063] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A coal mine transport transfer machine, characterized in that: It includes a vehicle body and a moving component, wherein the vehicle body is provided with a plurality of transport units; the moving component includes a support frame and running wheels, wherein one end of the support frame is connected to the vehicle body, and the other end of the support frame is connected to the running wheels, the support frame is rotatable relative to the vehicle body, the running wheels are straddled on both sides of the track in the coal mine lane, and the difference between the wheelbase of the running wheels and the track gauge of the track in the coal mine lane is 10 cm to 40 cm.

2. The coal mine transport transfer machine according to claim 1, characterized in that: One of the vehicle body and the support frame is provided with a rotating seat, and the other of the vehicle body and the support frame is provided with a rotating shaft. The rotating seat is provided with a rotating hole, and the rotating hole is arranged at the middle position of the rotating seat in the left and right directions of the vehicle body. The rotating shaft is detachably inserted into the rotating hole.

3. The coal mine transport transfer machine according to claim 2, characterized in that: The rotating seat is arranged on the supporting frame, and the supporting frame also includes a first support and a second support arranged opposite to each other, one of the first support and the second support is connected to the rotating seat, the walking wheel has a wheel axle, the wheel axle is arranged between the first support and the second support, and a connecting piece is provided between the first support and the second support.

4. The coal mine transport transfer machine according to claim 3, characterized in that: The first support and the second support are both provided with grooves, and the grooves match the outer shape of the axle; And / or, the connecting member is configured as a bolt.

5. The coal mine transport transfer machine according to claim 3, characterized in that: The support frame further includes at least two support rods, which are spaced apart along the left-right direction of the vehicle body, one end of the support rod is connected to the rotating seat, and the other end of the support rod is correspondingly connected to the first support or the second support.

6. The coal mine transport transfer machine according to claim 5, characterized in that: The support rod comprises a sleeve and an inner rod, wherein the inner rod is movably inserted into the sleeve, and a locking piece is arranged between the sleeve and the inner rod.

7. The coal mine transport transfer machine according to claim 6, characterized in that: The sleeve is provided with a fixing hole, the inner rod is provided with a plurality of positioning holes, the positioning holes are arranged at intervals along the length direction of the inner rod, and the locking piece is penetrated through the fixing hole and the positioning hole corresponding to the fixing hole.

8. The coal mine transport transfer machine according to claim 6, characterized in that: The support frame further comprises an elastic member, and two ends of the elastic member are correspondingly connected to the sleeve and the inner rod; And / or, the locking member is configured as a bolt.

9. The coal mine transport transfer machine according to claim 1, characterized in that: The moving assembly further comprises a shock absorbing pad, which is arranged between the vehicle body and the support frame; And / or, the traveling wheel comprises a wheel hub and a rubber tire located on the wheel hub.

10. The coal mine transport and transfer machine according to claim 1, characterized in that: The coal mine transport transfer machine also includes a brake assembly, which includes a brake disc and a chuck, wherein the brake disc is arranged on the travel wheel, the brake disc rotates synchronously with the travel wheel, the chuck cover is arranged on the outer side of the brake disc, and a brake block is arranged on the chuck, and the brake block can move along the axial direction of the travel wheel to abut against the brake disc; And / or, the movable components are arranged in multiple groups, and the movable components are arranged at intervals along the length direction of the vehicle body.