Wheel pair of a mine flat car

Abstract

The present application relates to the technical field of mine flat car, especially to a wheel pair of mine flat car. The wheel pair of mine flat car comprises a mine wheel with a hollow structure, characterized in that it further comprises a runaway prevention device; the runaway prevention device comprises a mounting frame and a brake assembly, the mounting frame is coaxially installed in the mine wheel; the brake assembly comprises a brake block and an elastic member, one end of the brake block is hinged to the mounting frame, and the hinged axis is parallel to the axis of the mine wheel, the other end of the brake block is elastically connected to the mounting frame through the elastic member, and the elastic member is arranged along the radial direction of the mine wheel. By setting the brake block and the elastic member, when the flat car runs at a high speed or runs away, the centrifugal force is greater than the elastic force of the elastic member, so that the brake block is in close friction with the inner wall of the mine wheel under the action of the centrifugal force, thereby realizing the rapid deceleration of the brake block on the mine wheel.

Description

Technical Field

[0001] This invention relates to the field of mining flatbed truck technology, and more particularly to a wheel pair for a mining flatbed truck. Background Technology

[0002] Mining flatbed cars are non-powered, narrow-gauge transport vehicles used in underground mine tunnels and surface industrial sites. They are primarily used for transferring equipment, electromechanical materials, and engineering materials. They lack self-propelled capability and rely on tractors, winches, or locomotives for traction. During inclined shaft hoisting operations in coal mines, the inclined shaft serves as an inclined transport channel for transferring coal, gangue, materials, and personnel between underground and the surface. Under these conditions, mining flatbed cars are highly susceptible to speeding, slippage, and even runaway due to improper operation or traction failure, which can easily lead to major safety accidents, causing casualties and property damage.

[0003] Existing technologies typically employ runaway prevention devices within inclined shafts to prevent accidents involving mine flatcars during hoisting or lowering. Commonly used runaway prevention devices mainly consist of a status display, electrical control box, barrier, rotary encoder, pneumatic retractor, and trip unit. The entire system is interlocked with the winch power supply; the device starts when the winch is powered on and stops when the winch is de-energized. After power is supplied, the system can monitor the mine car's position and the barrier's status in real time. During normal mine car operation, the PLC controls the barrier to automatically raise and lower according to preset positions, ensuring normal passage. When an abnormal situation such as speeding or runaway occurs, the PLC controls the barrier to intercept the mine car, thus preventing accidents.

[0004] However, existing runaway prevention devices have numerous components and complex structures, and rely heavily on electrical control elements. The underground environment is humid and dusty, and also contains flammable and explosive gases. Electrical equipment is susceptible to moisture and damage. Once a short circuit or leakage occurs, it will not only cause the runaway prevention device to fail, but may also trigger a gas explosion and other serious safety hazards, resulting in poor safety and reliability.

[0005] Therefore, there is an urgent need for a mine flatbed truck anti-runaway device that is simple in structure, requires no electrical control, and relies entirely on a purely mechanical structure for protection. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a wheel set for a mining flatbed truck, which solves the technical problems of existing anti-runaway devices having complex structures, relying on electrical control, and having low underground safety.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0010] This invention provides a wheel pair for a mining flatbed car, including a hollow mining wheel, characterized by further including a runaway prevention device; the runaway prevention device includes a mounting frame and a brake assembly, the mounting frame being coaxially mounted inside the mining wheel; the brake assembly includes a brake block and an elastic element, one end of the brake block being hinged to the mounting frame, and its hinge axis being parallel to the axis of the mining wheel, the other end of the brake block being elastically connected to the mounting frame through the elastic element, and the elastic element being arranged radially along the mining wheel; when the travel speed of the flatbed car exceeds a preset speed, the brake block, under the action of the centrifugal force of the mining wheel, can rotate around the hinge axis toward the inner wall of the mining wheel, and can pull the elastic element to stretch, so that the brake block is in contact with the inner wall of the mining wheel for friction, thereby reducing the travel speed of the flatbed car.

[0011] Preferably, the side of the brake block facing the inner wall of the mine car wheel is an arc surface, and the radius of the arc surface is adapted to the inner radius of the mine car wheel.

[0012] Preferably, the arc surface is provided with anti-slip teeth, and the cross-section of a single tooth of the anti-slip teeth is trapezoidal.

[0013] Preferably, the brake assembly is provided in multiple sets, which are evenly arranged circumferentially around the axis of the mine car wheel.

[0014] Preferably, the mounting frame includes a coaxially arranged connecting shaft and two mounting rings; the outer walls of the two mounting rings are tightly fitted to the inner wall of the mine car wheel and are interference-fitted with the mine car wheel; the two ends of the connecting shaft are respectively placed inside the two mounting rings and are respectively fixedly connected to the inner walls of the two mounting rings through multiple connecting rods, and the multiple connecting rods in the two mounting rings correspond one-to-one; the end of each brake block away from the elastic element is hinged to the two corresponding connecting rods in the two mounting rings, and the end of each elastic element away from the brake block is fixedly connected to the connecting shaft.

[0015] Preferably, the brake block has a mounting groove on the side facing the connecting shaft, the mounting groove is located at the end of the brake block away from the end that is hinged to the connecting rod, and the end of the elastic member away from the connecting shaft is fixedly connected to the mounting groove.

[0016] Preferably, the wheel pair further includes an axle, and there are two mining wheels. The two mining wheels are rotatably connected to both ends of the axle via bearings, and both ends of the axle extend into the two mining wheels. The connecting shaft has a clearance hole, and the end of the axle can be inserted into the clearance hole. Each mining wheel is equipped with the anti-runaway device.

[0017] Preferably, the axle includes a long axle and two short axles coaxially arranged; one end of each of the two short axles is fixedly connected to both ends of the long axle, and the other ends of each of the two short axles extend into the two mine car wheels and into the clearance hole; the two mine car wheels are rotatably connected to both ends of the long axle through the bearings.

[0018] Preferably, the inner diameter of the relief hole is larger than the outer diameter of the short shaft, and the inner diameter of the relief hole ranges from 48mm to 52mm, while the outer diameter of the short shaft ranges from 43mm to 47mm.

[0019] Preferably, the wheel pair further includes a sealing plate; the sealing plate is detachably mounted on the end of the mine car wheel away from the axle, for sealing the mine car wheel.

[0020] (III) Beneficial Effects

[0021] The beneficial effects of this invention are:

[0022] This invention discloses a wheel set for a mining flatbed car. An anti-runaway device is installed coaxially with the mine wheel and includes a mounting frame, a brake block, and an elastic element. One end of the brake block is hinged to the mounting frame, and the other end is elastically connected to the mounting frame via an elastic element arranged radially along the mine wheel. This design ensures that when the flatbed car is traveling at slow or constant speed, the centrifugal force is less than the elastic force of the elastic element, maintaining a stable distance between the brake block and the mine wheel, thus guaranteeing normal operation of the flatbed car. However, when the flatbed car is traveling at excessive speed or running off course, the centrifugal force exceeds the elastic force of the elastic element, causing the brake block to rub against the inner wall of the mine wheel under centrifugal force. This dissipates the kinetic energy of the mine wheel, allowing for rapid deceleration of the mine wheel and thus slowing down the flatbed car. Compared to existing technologies, this invention uses a purely mechanical structure to decelerate the mine wheel, effectively adapting to the harsh environment of underground mining, characterized by humidity, dust, and flammable and explosive gases. It avoids safety hazards caused by electrical equipment failures and significantly improves the safety and reliability of the anti-runaway device. Meanwhile, the anti-runaway device has a simple structure, which reduces manufacturing costs, installation and maintenance difficulty. Moreover, the anti-runaway device is installed inside the mine car wheel, which does not occupy additional roadway space, making it suitable for narrow underground working conditions. Attached Figure Description

[0023] Figure 1This is a schematic diagram of the overall three-dimensional structure of the wheelset of a mining flatbed truck according to the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0025] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure at point BB;

[0026] Figure 4 This is a schematic diagram of the overall three-dimensional structure of the wheel pair of a mining flatbed truck according to the present invention, showing the cooperation and installation of the mining wheel and brake assembly.

[0027] Figure 5 This is a schematic diagram of the overall three-dimensional structure of the brake assembly for the wheel pair of a mining flatbed truck according to the present invention.

[0028] Figure 6 This is a three-dimensional disassembly diagram of the brake assembly of the wheel pair of a mining flatbed truck according to the present invention.

[0029] [Explanation of Labels in the Attached Image]

[0030] 1: Mine car wheel; 2: Runaway prevention device; 21: Mounting bracket; 211: Connecting shaft; 2111: Clearance hole; 212: Mounting ring; 213: Connecting rod; 22: Brake assembly; 221: Brake block; 2211: Curved surface; 2212: Mounting groove; 222: Elastic element; 3: Axle; 31: Long shaft; 32: Short shaft; 4: Sealing plate. Detailed Implementation

[0031] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0032] Example

[0033] The wheel pair of a mining flatbed truck according to this embodiment includes a hollow mining wheel 1 and a runaway prevention device 2.

[0034] Specifically, such as Figure 3 and Figure 4As shown, the anti-runaway device 2 includes a mounting frame 21 and a brake assembly 22. The mounting frame 21 is coaxially mounted inside the mine wheel 1. The brake assembly 22 includes a brake block 221 and an elastic element 222. One end of the brake block 221 is hinged to the mounting frame 21, and its hinge axis is parallel to the axis of the mine wheel 1. The other end of the brake block 221 is elastically connected to the mounting frame 21 through the elastic element 222, which is arranged radially along the mine wheel 1. When the speed of the flatbed car does not exceed a preset speed, the elastic element 222 can pull the brake block 221 to create a gap between the brake block 221 and the mine wheel 1. When the speed of the flatbed car exceeds the preset speed, the brake block 221 can rotate around the hinge axis toward the inner wall of the mine wheel 1 under the centrifugal force of the mine wheel 1, and can pull the elastic element 222 to stretch, so that the brake block 221 rubs against the inner wall of the mine wheel 1, thereby reducing the speed of the flatbed car.

[0035] By installing a runaway prevention device 2 coaxially with the mine wheel 1 inside the vehicle, the runaway prevention device 2 includes a mounting frame 21, a brake block 221, and an elastic element 222. One end of the brake block 221 is hinged to the mounting frame 21, and the other end is elastically connected to the mounting frame 21 through the elastic element 222 arranged radially along the mine wheel 1. This ensures that when the flatbed car is traveling at a slow or constant speed, the centrifugal force is less than the elastic force of the elastic element 222, thus stabilizing the brake block 221 and the mine wheel 1 and maintaining a certain distance, thereby ensuring the normal operation of the flatbed car. However, when the flatbed car is traveling at excessive speed or running away from the vehicle, the centrifugal force is greater than the elastic force of the elastic element 222, causing the brake block 221 to rub against the inner wall of the mine wheel 1 under the action of centrifugal force, thereby consuming the kinetic energy of the mine wheel 1 and achieving rapid deceleration of the mine wheel 1 by the brake block 221, thus slowing down the flatbed car. Compared to existing technologies, this invention employs a purely mechanical structure to decelerate the mine car wheel 1. This effectively adapts to the harsh underground environment characterized by humidity, dust, and flammable and explosive gases, avoiding safety hazards caused by electrical equipment malfunctions and significantly improving the safety and reliability of the runaway vehicle prevention device 2. Furthermore, the runaway vehicle prevention device 2 has a simple structure, reducing manufacturing costs, installation, and maintenance difficulty. Since it is installed inside the mine car wheel 1, it does not occupy additional roadway space, making it suitable for narrow underground working conditions.

[0036] It should be noted that the mine car wheel 1 can be made of ZG35SiMn cast steel, which has high strength, high wear resistance, and good impact toughness. It can withstand the impact force during heavy-load transportation and deceleration of the flatbed car, and is also resistant to underground moisture and dust corrosion. The brake block 221 can be made of ZGMn13 high manganese steel, which has extremely high wear resistance and impact toughness. During deceleration friction, a hardened layer can be formed, further improving wear resistance. It can withstand the frictional wear with the inner wall of the mine car wheel 1 for a long time, is suitable for frequent deceleration conditions, and produces no sparks, thus preventing explosions in the mine. The elastic element 222 can be made of 60Si2Mn spring steel. This material has a high elastic limit and good fatigue strength, can withstand long-term tensile and restorative cyclic motion, is not prone to plastic deformation, and is resistant to moisture and corrosion. The initial range of the elastic element 222 is 30N-40N.

[0037] Specifically, when the flatbed truck's speed is below 3 m / s, i.e., when the flatbed truck is traveling at a slow or constant speed, the centrifugal force on the brake block 221 is less than the elastic force of the elastic element 222, and the centrifugal force does not exceed 40 N. The gap between the brake block 221 and the inner wall of the mine wheel 1 is 5 mm-7 mm. When the flatbed truck's speed is above 3 m / s, i.e., when the flatbed truck is traveling at excessive speed or running over, the centrifugal force on the brake block 221 is greater than the elastic force of the elastic element 222, and the centrifugal force is greater than 40 N. The brake block 221 rubs against the mine wheel 1, thus decelerating the mine wheel 1.

[0038] Furthermore, such as Figures 3-6 As shown, the side of the brake block 221 facing the inner wall of the mine wheel 1 is an arc surface 2211, and the radius of the arc surface 2211 is adapted to the inner radius of the mine wheel 1. This increases the contact area between the brake block 221 and the inner wall of the mine wheel 1, allowing the frictional resistance to be evenly distributed on the contact surface, thereby improving the efficiency of the brake block 221 in consuming the kinetic energy of the mine wheel 1, and thus improving the deceleration efficiency of the brake block 221 on the mine wheel 1. At the same time, the arc surface 2211 can also prevent the brake block 221 from wearing out too quickly due to excessive local force, thus extending the service life of the brake block 221. Preferably, the inner radius of the mine wheel 1 is in the range of 280mm-320mm, and the radius of the arc surface 2211 is in the range of 280mm-320mm. This allows the arc surface 2211 to fit against the inner wall of the mine wheel 1 when the brake block 221 rubs against it, increasing the contact area between the arc surface 2211 and the inner wall of the mine wheel 1. Furthermore, the length of the arc surface 2211 is in the range of 100mm-140mm to avoid the brake block 221 from deforming due to excessive length of the arc surface 2211, and to avoid the brake block 221 from being too short, which would affect the deceleration efficiency of the mine car wheel 1.

[0039] Furthermore, such as Figures 3-6As shown, the arc surface 2211 is provided with anti-slip teeth, and the cross-section of each tooth of the anti-slip teeth is trapezoidal to increase the friction between the brake block 221 and the inner wall of the mine wheel 1. This allows for the rapid dissipation of the kinetic energy of the mine wheel 1, preventing the brake block 221 from slipping when rubbing against the mine wheel 1, thus preventing the flatbed car from continuously exceeding its speed limit and further reducing safety risks. The tooth depth of the anti-slip gear ranges from 1.5mm to 3mm, preferably 2mm, to effectively increase the friction between the brake block 221 and the inner wall of the mine wheel 1, preventing slippage during deceleration.

[0040] Furthermore, such as Figures 3-6 As shown, the brake assembly 22 is provided with multiple sets, which are evenly arranged around the axis of the mine car wheel 1. It can further increase the frictional resistance between the anti-runaway device 2 and the mine car wheel 1, improve the deceleration efficiency of the anti-runaway device 2, shorten the deceleration distance, and ensure that the anti-runaway device 2 can decelerate the flatbed car quickly.

[0041] Furthermore, such as Figure 5 and Figure 6 As shown, the mounting frame 21 includes a coaxially arranged connecting shaft 211 and two mounting rings 212. The outer walls of the two mounting rings 212 are tightly fitted to the inner wall of the mine wheel 1 and are interference-fitted with the mine wheel 1, which enables a firm connection between the mounting frame 21 and the mine wheel 1, ensuring that the mounting frame 21 rotates synchronously when the mine wheel 1 rotates, and preventing relative slippage between the mounting frame 21 and the mine wheel 1. The two ends of the connecting shaft 211 are respectively placed inside the two mounting rings 212 and are fixedly connected to the inner walls of the two mounting rings 212 through multiple connecting rods 213. The multiple connecting rods 213 in the two mounting rings 212 correspond one-to-one, which can enhance the overall structural strength and stability of the mounting frame 21, so as to withstand the large friction and impact forces generated during braking and prevent the mounting frame 21 from deforming or being damaged. The end of each brake block 221 furthest from the elastic element 222 is hinged to two corresponding connecting rods 213 within the two mounting rings 212, and the end of each elastic element 222 furthest from the brake block 221 is fixedly connected to the connecting shaft 211. This ensures that when the centrifugal force of the mine car wheel 1 is greater than the elastic force of the elastic element 222, the brake block 221 rotates around its hinge axis, thereby ensuring that the brake block 221 can stably and effectively decelerate the mine car wheel 1. The connecting shaft 211 and connecting rods 213 can be made of high-quality carbon structural steel (No. 45), heat-treated to improve structural strength and wear resistance, capable of withstanding friction and impact forces during deceleration, and preventing deformation and breakage. The mounting rings 212 can be made of ZG40Cr cast steel, ensuring a firm connection when interference-fitted with the mine car wheel 1, while also possessing good wear resistance and deformation resistance.

[0042] Furthermore, such as Figures 3-6As shown, a mounting groove 2212 is provided on the side of the brake block 221 facing the connecting shaft 211. The mounting groove 2212 is located at the end of the brake block 221 away from the end that is hinged to the connecting rod 213. The end of the elastic member 222 away from the connecting shaft 211 is fixedly connected to the mounting groove 2212 to provide an installation position for the elastic member 222. This allows for positioning of the elastic member 222, effectively improving the installation accuracy of the elastic member 222 and ensuring that the elastic member 222 can be accurately and firmly connected to the brake block 221, thus preventing the elastic member 222 from shifting or misaligning during installation.

[0043] Furthermore, such as Figure 1 As shown, the wheel set also includes an axle 3. Two mine car wheels 1 are provided, each rotatably connected to both ends of the axle 3 via bearings, ensuring the mine car wheels 1 can rotate freely without affecting the normal operation of the flatbed car. Both ends of the axle 3 extend into the two mine car wheels 1. The connecting shaft 211 has clearance holes 2111, and the ends of the axle 3 can be inserted into the clearance holes 2111 to provide clearance for the installation of the axle 3, ensuring that the installation of the axle 3 and the anti-runaway device 2 does not interfere with each other, avoiding contact between the axle 3 and the connecting shaft 211 and the resulting frictional resistance, thus preventing any impact on the normal rotation of the mine car wheels 1. Each mine car wheel 1 is equipped with an anti-runaway device 2, enabling both anti-runaway devices 2 to simultaneously decelerate both mine car wheels 1. This prevents the flatbed car from deviating or slipping off the track when a single anti-runaway device 2 decelerates a single mine car wheel 1, thus avoiding safety accidents and further improving the deceleration effect and protection reliability.

[0044] Among them, axle 3 can be made of 40Cr alloy structural steel and quenched and tempered, which has high strength, high toughness and good wear resistance, and can withstand the large load of the heavy objects transported by the flatbed truck, thus avoiding deformation and breakage of axle 3.

[0045] Furthermore, such as Figure 2 As shown, the axle 3 includes a long axle 31 and two short axles 32 arranged coaxially. One end of each of the two short axles 32 is fixedly connected to both ends of the long axle 31, and the other ends of each of the two short axles 32 extend into the two mine car wheels 1 and into the clearance holes 2111. This allows for the positioning of the axle 3 and the anti-runaway device 2, ensuring that the anti-runaway device 2 is coaxial with the axle 3 when installed in the mine car wheels 1. The two mine car wheels 1 are rotatably connected to both ends of the long axle 31 via bearings, which enhances the overall load-bearing capacity of the axle 3, enabling it to withstand the large loads when the flatbed truck transports heavy objects and preventing the axle 3 from deforming or breaking.

[0046] Furthermore, the inner diameter of the clearance hole 2111 is larger than the outer diameter of the short shaft 32, and the inner diameter of the clearance hole 2111 ranges from 48mm to 52mm, while the outer diameter of the short shaft 32 ranges from 43mm to 47mm. This not only ensures that the short shaft 32 can be smoothly inserted into the clearance hole 2111, providing sufficient clearance space and positioning for the installation of the axle 3 and avoiding installation interference, but also prevents friction between the short shaft 32 and the connecting shaft 211, ensuring smooth relative rotation between the mine car wheel 1 and the axle 3, and not affecting the normal operation of the flatbed car.

[0047] Furthermore, such as Figure 1 As shown, the wheel set also includes a sealing plate 4. The sealing plate 4 is detachably installed at the end of the mine car wheel 1 furthest from the axle 3, used to seal the mine car wheel 1, preventing moisture, dust, and debris from entering the interior of the mine car wheel 1, avoiding moisture, wear, and blockage of the anti-runaway device 2, ensuring the structural integrity and functional stability of the anti-runaway device 2, and extending the device's service life to adapt to the harsh environment of moisture and dust underground. Simultaneously, the sealing plate 4 adopts a detachable installation method, which facilitates later disassembly and maintenance of the anti-runaway device 2 and the internal components of the mine car wheel 1 without disassembling the entire wheel set, reducing maintenance difficulty and workload, and improving maintenance efficiency. The sealing plate 4 can be made of Q235B steel plate with a galvanized anti-corrosion treatment, possessing good sealing and corrosion resistance, and can effectively block moisture and dust from entering the interior of the mine car wheel 1.

[0048] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0049] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0052] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A wheel pair for a mining flatbed car, comprising a hollow mining wheel (1), characterized in that, It also includes anti-runaway device (2); The anti-runaway device (2) includes a mounting bracket (21) and a brake assembly (22), wherein the mounting bracket (21) is coaxially mounted inside the mine car wheel (1); The brake assembly (22) includes a brake block (221) and an elastic element (222). One end of the brake block (221) is hinged to the mounting frame (21), and its hinge axis is parallel to the axis of the mine car wheel (1). The other end of the brake block (221) is elastically connected to the mounting frame (21) through the elastic element (222), and the elastic element (222) is arranged radially along the mine car wheel (1). When the speed of the flatbed truck exceeds the preset speed, the brake block (221) can rotate around the hinge axis toward the inner wall of the mine wheel (1) under the action of the centrifugal force of the mine wheel (1), and can pull the elastic element (222) to stretch so that the brake block (221) fits and rubs against the inner wall of the mine wheel (1), thereby reducing the speed of the flatbed truck.

2. The wheelset as described in claim 1, characterized in that: The side of the brake block (221) facing the inner wall of the mine wheel (1) is an arc surface (2211), and the radius of the arc surface (2211) is adapted to the inner radius of the mine wheel (1).

3. The wheel pair as described in claim 2, characterized in that: The arc surface (2211) is provided with anti-slip teeth, and the cross section of a single tooth of the anti-slip teeth is trapezoidal.

4. The wheel pair as described in claim 3, characterized in that: The brake assembly (22) is provided in multiple sets, which are evenly arranged around the axis of the mine car wheel (1).

5. The wheel pair as described in claim 4, characterized in that: The mounting bracket (21) includes a coaxially arranged connecting shaft (211) and two mounting rings (212); The outer walls of the two mounting rings (212) are tightly fitted to the inner wall of the mine car wheel (1) and are interference-fitted with the mine car wheel (1); The two ends of the connecting shaft (211) are respectively placed inside the two mounting rings (212), and are respectively fixedly connected to the inner walls of the two mounting rings (212) through multiple connecting rods (213), and the multiple connecting rods (213) inside the two mounting rings (212) correspond one to one; The end of each brake block (221) away from the elastic element (222) is hinged to the two corresponding connecting rods (213) inside the two mounting rings (212), and the end of each elastic element (222) away from the brake block (221) is fixedly connected to the connecting shaft (211).

6. The wheelset as described in claim 5, characterized in that: The brake block (221) has a mounting groove (2212) on the side facing the connecting shaft (211). The mounting groove (2212) is located at the end of the brake block (221) away from the end that is hinged to the connecting rod (213), and the end of the elastic member (222) away from the connecting shaft (211) is fixedly connected to the mounting groove (2212).

7. The wheelset as described in claim 5, characterized in that: The wheel pair also includes an axle (3), and there are two mine wheels (1). The two mine wheels (1) are rotatably connected to the two ends of the axle (3) through bearings, and the two ends of the axle (3) extend into the two mine wheels (1). The connecting shaft (211) has a clearance hole (2111), and the end of the axle (3) can be inserted into the clearance hole (2111); Each of the said mine car wheels (1) is equipped with the anti-runaway device (2).

8. The wheel pair as described in claim 7, characterized in that: The axle (3) includes a long axle (31) and two short axles (32) arranged coaxially. One end of each of the two short shafts (32) is fixedly connected to both ends of the long shaft (31), and the other end of each of the two short shafts (32) extends into the two mine car wheels (1) and into the clearance hole (2111); The two mine car wheels (1) are rotatably connected to both ends of the long shaft (31) via the bearings.

9. The wheel pair as described in claim 8, characterized in that: The inner diameter of the relief hole (2111) is larger than the outer diameter of the short shaft (32), and the inner diameter of the relief hole (2111) ranges from 48mm to 52mm, while the outer diameter of the short shaft (32) ranges from 43mm to 47mm.

10. The wheelset as claimed in claim 7, characterized in that: The wheel pair also includes a sealing plate (4); The sealing plate (4) is detachably installed on the end of the mine car wheel (1) away from the axle (3) for sealing the mine car wheel (1).

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