A lockable wheel set for electric transport vehicle

Abstract

The present invention discloses a lockable wheel set of an electric transport vehicle, belonging to the technical field of electric transport vehicles. The lockable wheel set of the electric transport vehicle comprises a plurality of front wheels and rear wheels, the inner wall of the rear wheel is provided with a ratchet groove, a brake disc is installed on one side of the rear wheel, a plurality of front wheels and rear wheels are rotatably connected with a frame between each other, the frame is rotatably connected with the rear wheel and the brake disc, a locking assembly is fixedly connected to the through end of the frame, and a self-centering brake assembly is arranged at the connection between the rear wheel and the frame. The present invention improves the braking efficiency and braking effect, shortens the braking distance, and enhances the safety of the vehicle by adopting a self-centering brake assembly and a locking assembly. At the same time, the electric transport vehicle can be effectively prevented from sliding or moving when parked, and the risk of accidents caused by sliding can be reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of electric transport vehicles, and in particular relates to a lockable wheel set of an electric transport vehicle. Background Art

[0002] An electric truck is a portable electric cargo tool, usually used for short-distance cargo transportation and handling in cities. It is usually composed of a frame, an electric drive device, a battery, a control system, wheels, etc. It is lightweight and easy to operate in narrow spaces or crowded environments. It can be flexibly used in shopping malls, warehouses, restaurants, hospitals and other places to quickly move goods from one location to another. The use of an electric truck can reduce the operator's physical exertion and labor intensity, especially in situations where goods need to be frequently handled, such as replenishing store shelves and warehousing management in logistics centers. As a modern handling tool, it not only improves work efficiency and operational convenience, but also conforms to the trend of environmental protection and sustainable development. Therefore, it is widely used and promoted in various commercial and service places.

[0003] A Chinese invention patent with publication number CN115707582A discloses a wheel lock structure, which uses a cover assembly to cover the wheel nuts or wheel bolts. The wheel nuts or wheel bolts can only be removed from the wheel after being unlocked by a special key, thereby reducing the risk of wheel theft. However, when braking and locking the vehicle, the vehicle still uses disc brakes and drum brakes for braking and parking, but their braking efficiency is usually low, and a longer braking distance may be required to stop the vehicle. Electric transport vehicles usually experience long-term braking. If the heat dissipation performance of the drum brake is poor, it may cause brake degradation, affect the braking effect, and even cause brake failure. In addition, in daily use, electric transport vehicles often need to tilt slopes to varying degrees to lock and park, unload or transport. If the electric transport vehicle uses drum brakes, then when parked on an inclined slope, due to the reduced contact area between the brake disc and the brake drum, the braking efficiency of the brake system may decrease, increasing the risk of brake failure. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a lockable wheel set of an electric transport vehicle which improves braking efficiency and effect and reduces the risk of brake failure.

[0005] The technical solution adopted to solve the above technical problems is: a lockable wheel set of an electric transport vehicle, including a plurality of front wheels and rear wheels, the inner wall of the rear wheel is provided with a ratchet groove, a brake disc is installed on one side of the rear wheel, a plurality of front wheels and rear wheels are rotatably connected with a frame between each other, the frame is rotatably connected with the rear wheel and the brake disc, a locking assembly is fixedly connected to the through end of the frame, and a self-centering brake assembly is provided at the connection between the rear wheel and the frame;

[0006] The locking assembly includes a locking box, the through end of the frame is fixedly connected to the locking box, the interior of the locking box is a hollow structure, and the locking box is a hexagonal structure, the hexagonal end of the locking box is in an open state, a wedge plate is rotatably connected to the corner of the locking box, the wedge plate is engaged with the ratchet groove, one side of the wedge plate is fixedly connected to a third spring, and the other end of the third spring is fixedly connected to the outer wall of the locking box;

[0007] The self-centering brake assembly includes a diamond plate, which is fixedly connected to the frame, and a plurality of limit bars are fixedly connected to one side of the diamond plate, and the plurality of limit bars are symmetrically distributed in a circle, and a slider is connected to the limit sliding position on the side of the limit bar away from the diamond plate, and the other end of the slider is fixedly connected to an L-shaped brake plate, and one end of the L-shaped brake plate is fixedly connected to a brake pad, and the brake pad is engaged with a brake disc.

[0008] The above technical solution can effectively prevent the electric transporter from sliding or moving when parked, especially on an inclined slope, which increases the safety of parking and reduces the risk of accidents. In addition, the wheels can be easily locked when needed without the need for additional tools or complicated operations, making the parking process more convenient and quick.

[0009] Furthermore, a fixed plate is fixedly connected to the inside of the locking box, and a plurality of slide grooves are opened on the side of the fixed plate away from the locking box, and the plurality of slide grooves are symmetrically distributed in a circle. A slide plate is provided in the slide groove, and the slide plate is slidably connected to the fixed plate, and the fixed plate limits the slide plate. A second rotating plate is rotatably connected to the side of the fixed plate away from the locking box, and a locking motor is installed on the side of the locking box away from the frame, and the output end of the locking motor is rotatably connected to the locking box and the fixed plate, and the through end of the locking motor is fixedly connected to the second rotating plate.

[0010] The above technical solution is applicable to various road surfaces and driving environments, and can effectively achieve balanced braking regardless of driving on a flat road or parking on a slope.

[0011] Furthermore, the second rotating plate is penetrated by a plurality of arc grooves, and the plurality of arc grooves are symmetrically distributed in a circle, a sliding rod is arranged in the arc groove, the sliding rod is fixedly connected to the sliding plate, the sliding rod is slidably connected to the second rotating plate, and the second rotating plate limits the sliding rod, and one end of the sliding plate located outside the sliding groove is rotatably connected to an arc connecting plate, and the other end of the arc connecting plate is rotatably connected to a wedge plate, the arc connecting plate is located at the opening of the locking box, and the curved side surface of the arc connecting plate is arranged toward the center of the locking box.

[0012] Through the above technical solution, the friction heat generated during braking can be reduced, which is beneficial to lowering the temperature of the braking system and extending the service life of the braking system.

[0013] Furthermore, a plurality of second springs are fixedly connected to one side of the diamond plate away from the limit bar, and the plurality of second springs are symmetrically distributed in a circle. A sleeve plate is fixedly connected to the other end of the second spring, and the sleeve plate is slidably connected to the frame. A plurality of brake lines are fixedly connected to the other side of the sleeve plate, and a battery box is installed at the other end of the brake line, and the battery box is fixedly connected to the frame. One end of the brake line is located in the battery box, and a plurality of first connecting rods are rotatably connected to the outer side of the sleeve plate away from the center, and the other end of the first connecting rod is rotatably connected to the L-shaped brake plate.

[0014] Through the above technical solution, the moving direction of the wheel can be more directly acted on, the forward speed of the electric transport vehicle can be effectively slowed down, and the braking efficiency can be improved.

[0015] Furthermore, an electric motor is installed at the center of the side of the frame away from the rear wheel, the output end of the electric motor is rotatably connected to the frame, the through end of the electric motor is rotatably connected to a plurality of universal joints, the other end of the universal joint connected to the electric motor is transmitted to the front wheel, and a steering assembly is arranged on the top of the electric motor, and the steering assembly is fixedly connected to the front wheel.

[0016] Furthermore, the steering assembly includes a plurality of first connecting plates, which are symmetrically arranged, the first connecting plates are fixedly connected to the front wheel connecting shaft, the other end of the first connecting plate is rotatably connected to the second connecting plate, the second connecting plates on both sides are rotatably connected to the steering shaft at one end away from the first connecting plate, the top end of the steering shaft is slidably connected to a connecting plate, and the bottom end surface of the connecting plate is fixedly connected to a vibration damping assembly.

[0017] Through the above technical solution, the steering input force can be effectively transmitted, the demand for the power steering system is reduced, the design is simpler, the consumption of components and energy is reduced, and the maintenance cost is reduced.

[0018] Furthermore, the shock absorbing assembly includes a plurality of fixed plates, which are distributed at both ends of the connecting plate, the top of the fixed plate is fixedly connected to the bottom surface of the connecting plate, both sides of the bottom surface of the fixed plate are fixedly connected with spring columns, the bottom end of the spring column is fixedly connected with a fixed block, the bottom end of the fixed block is fixedly connected with a support frame, and the support frame is fixedly connected to the frame.

[0019] Through the above technical solution, the impact and vibration of the bottom parts of the electric transport truck can be reduced, the wear and damage of the parts can be reduced, which helps to extend the service life of the electric transport truck and reduce maintenance costs.

[0020] Furthermore, a connecting rod is fixedly connected between each of the several fixed blocks, and a first rotating plate is rotatably connected to both sides of the bottom end surface of the fixed plate. A ring is rotatably connected to the other end of the first rotating plate, and the ring is slidably connected to the connecting rod. A first spring is fixedly connected between the rings on both sides, and the first spring does not contact the connecting rod.

[0021] Through the above technical solution, the shaking and swaying of the bottom of the electric transport truck are reduced, the driving stability of the electric transport truck can be improved, the electric transport truck is easier to control and operate, and the probability of accidents is reduced.

[0022] The beneficial effects of the present invention are as follows:

[0023] (1) The present invention adopts a self-centering brake assembly. When the electric transport vehicle needs to brake, the brake on the handle is pressed, so that the brake line pulls the sleeve to move along the linear direction of the frame to the battery box. When the sleeve moves, the second spring is stretched. At the same time, the first connecting rod rotates relative to the sleeve, thereby driving the L-shaped brake plate to slide on the limit bar, so that the sliding rod connected to the other end of the L-shaped brake plate squeezes the brake disc. Under the action of friction, the purpose of deceleration is achieved, and the brake pad and the brake disc can be more closely contacted, thereby improving the braking efficiency, shortening the braking distance, enhancing the safety of the vehicle, ensuring that the brake disc is subjected to a balanced clamping force, and making the vehicle more stable during braking.

[0024] (2) The present invention adopts a locking assembly, which drives the second rotating plate to rotate through the operation of the locking motor, so that the sliding rod moves in the arc groove, and then the sliding plate moves in the sliding groove in the fixed plate, so that it moves toward the center of the fixed plate, driving the arc connecting plate to rotate, and prompting the other end of the arc connecting plate to pull the wedge plate to rotate. At this time, the third spring is stretched, so that the other end of the wedge plate engages with the ratchet groove, thereby limiting the movement of the rear wheel and achieving the purpose of locking. The wheel can be firmly locked to prevent the vehicle from sliding or moving on the inclined slope, thereby increasing the stability of the electric transport vehicle. At the same time, it can effectively reduce the risk of sliding of the electric transport vehicle on the inclined slope, reduce the possibility of accidents or damage caused by sliding, and increase the safety of users and the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a first perspective structural diagram of the present invention.

[0026] Figure 2 It is a rear wheel local structure diagram of the present invention.

[0027] Figure 3 It is a rear wheel structural diagram of the present invention.

[0028] Figure 4 It is a diagram showing the internal structure of the connection plate of the present invention.

[0029] Figure 5 It is a second viewing angle structural diagram of the present invention.

[0030] Figure 6 It is a structural diagram of the vibration reduction assembly of the present invention.

[0031] Figure 7 It is a first-view structural diagram of the interior of the rear wheel of the present invention.

[0032] Figure 8 It is a second viewing angle structural diagram of the interior of the rear wheel of the present invention.

[0033] Fig. 9 yes Figure 8 Enlarged structural diagram at point A.

[0034] Fig.10 It is a first-view structural diagram of the interior of the locking box of the present invention.

[0035] Fig.11 It is a diagram showing the internal structure of the fixed disk of the present invention.

[0036] Fig.12 It is a second viewing angle structural diagram of the interior of the locking box of the present invention.

[0037] Fig.13 It is a structural diagram of the connection between the self-centering brake assembly and the rear wheel from a first perspective of the present invention.

[0038] Fig.14 yes Figure 2 Enlarged three-dimensional structure diagram at point B.

[0039] Fig.15 It is a structural diagram of the connection between the brake pad and the brake disc of the present invention.

[0040] Fig.16 It is a structural diagram of the connection between the self-centering brake assembly and the rear wheel from a second viewing angle of the present invention.

[0041] Figure numerals: 1, front wheel; 2, rear wheel; 3, frame; 4, electric motor; 5, steering assembly; 6, support frame; 7, vibration reduction assembly; 8, connecting plate; 9, battery box; 10, self-centering brake assembly; 11, locking assembly; 12, brake line; 13, brake disc; 21, ratchet groove; 51, first connecting plate; 52, second connecting plate; 53, steering shaft; 71, fixing block; 72, connecting rod; 73, spring column; 74, fixing plate; 75, first rotating plate; 76, collar; 77, first spring; 10 01, diamond plate; 1002, limit strip; 1003, slider; 1004, L-shaped brake plate; 1005, first connecting rod; 1006, sleeve plate; 1007, second spring; 1008, brake pad; 1101, locking box; 1102, third spring; 1103, wedge plate; 1104, locking motor; 1105, arc-shaped connecting plate; 1106, second rotating plate; 1107, arc-shaped groove; 1108, slide bar; 1109, fixed plate; 1110, slide plate; 1111, slide groove. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] like Figures 1 to 3 The embodiment shows that a lockable wheel group of an electric transport vehicle includes a plurality of front wheels 1 and rear wheels 2, a ratchet groove 21 is provided on the inner wall of the rear wheel 2, a brake disc 13 is installed on one side of the rear wheel 2, a plurality of front wheels 1 and rear wheels 2 are rotatably connected with a frame 3 between each other, an electric motor 4 is installed at the center of the frame 3 away from the rear wheel 2, an output end of the electric motor 4 is rotatably connected with the frame 3, a plurality of universal joints are rotatably connected at the through end of the electric motor 4, the other end of the universal joint connected with the electric motor 4 is transmitted to the front wheel 1, a steering assembly 5 is fixedly connected with the front wheel 1, the frame 3 is rotatably connected with the rear wheel 2 and the brake disc 13, a locking assembly 11 is fixedly connected at the through end of the frame 3, and a self-centering brake assembly 10 is provided at the connection between the rear wheel 2 and the frame 3, which is suitable for various road surfaces and driving environments, and can effectively achieve balanced braking whether driving on a flat road surface or parking on a slope;

[0044] like Figures 4 to 5As shown, a steering assembly 5 is arranged on the top of the electric motor 4, and the steering assembly 5 includes a plurality of first connecting plates 51, and the plurality of first connecting plates 51 are symmetrically arranged. The first connecting plate 51 is fixedly connected to the connecting shaft of the front wheel 1, and the other end of the first connecting plate 51 is rotatably connected to the second connecting plate 52, which can effectively transmit the steering input force, reduce the demand for the steering power system, and is simpler in design, reducing the consumption of components and energy, and reducing the maintenance cost. The second connecting plates 52 on both sides are rotatably connected to the steering shaft 53 at one end away from the first connecting plate 51, and the top end of the steering shaft 53 is slidably connected to the connecting plate 8, and the bottom surface of the connecting plate 8 is fixedly connected to the vibration reduction assembly 7;

[0045] like Figure 5 to Figure 6 As shown, the vibration reduction assembly 7 includes a plurality of fixing plates 74, and the plurality of fixing plates 74 are distributed at both ends of the connecting plate 8. The top of the fixing plate 74 is fixedly connected to the bottom surface of the connecting plate 8, and the two sides of the bottom surface of the fixing plate 74 are fixedly connected with spring columns 73, which can reduce the shaking and swaying of the bottom of the electric transport vehicle, improve the driving stability of the electric transport vehicle, make it easier to control and operate, and reduce the probability of accidents. The bottom end of the spring column 73 is fixedly connected with a fixing block 71, and a plurality of fixing blocks 71 are fixedly connected with connecting rods 72 between each other. The first rotating plates 75 are rotatably connected to the two sides of the bottom surface of 74, and the other end of the first rotating plate 75 is rotatably connected to the ring 76, which is slidably connected to the connecting rod 72, which can reduce the impact and vibration of the bottom parts of the electric transport vehicle, reduce the wear and damage of the parts, help to extend the service life of the electric transport vehicle, and reduce the maintenance cost. The first spring 77 is fixedly connected between the rings 76 on both sides, and the first spring 77 does not contact the connecting rod 72. The bottom end of the fixed block 71 is fixedly connected to the support frame 6, and the support frame 6 is fixedly connected to the frame 3;

[0046] like Figures 7 to 12The locking assembly 11 includes a locking box 1101, a fixed plate 1109 is fixedly connected inside the locking box 1101, a plurality of slide grooves 1111 are provided on the side of the fixed plate 1109 away from the locking box 1101, and the plurality of slide grooves 1111 are symmetrically distributed on the circumference, a slide plate 1110 is provided in the slide groove 1111, the slide plate 1110 is slidably connected to the fixed plate 1109, and the fixed plate 1109 limits the slide plate 1110, and the fixed plate 1109 is away from the locking box 1101. One side is rotatably connected to a second rotating plate 1106, and the second rotating plate 1106 is penetrated by a plurality of arc grooves 1107, and the plurality of arc grooves 1107 are symmetrically distributed in a circle, and a slide bar 1108 is arranged in the arc groove 1107, which can effectively prevent the electric transport vehicle from sliding or moving when parked, especially on an inclined slope, thereby increasing the safety of parking and reducing the risk of accidents. In addition, the wheels can be easily locked when needed without the need for additional tools or complicated operations. This makes the parking process more convenient and quick. The sliding rod 1108 is fixedly connected to the sliding plate 1110, and the sliding rod 1108 is slidably connected to the second rotating plate 1106, and the second rotating plate 1106 limits the sliding rod 1108. The end of the sliding plate 1110 located on the outside of the sliding groove 1111 is rotatably connected with the arc-shaped connecting plate 1105, and the other end of the arc-shaped connecting plate 1105 is rotatably connected to the wedge plate 1103. The arc-shaped connecting plate 1105 is located at the opening of the locking box 1101, and the curved side surface of the arc-shaped connecting plate 1105 is arranged toward the center of the locking box 1101. The locking motor 1104 is installed on the side of the locking box 1101 away from the frame 3. The power cord of the locking motor 1104 is fixedly connected to the frame 3. The locking box 1101 is electrically connected to the battery in the battery box 9, the output end of the locking motor 1104 is connected to the locking box 1101 and the fixed plate 1109 through rotation, the through end of the locking motor 1104 is fixedly connected to the second rotating plate 1106, the through end of the frame 3 is fixedly connected to the locking box 1101, the locking box 1101 is hollow inside, and the locking box 1101 is a hexagonal structure, the hexagonal end of the locking box 1101 is in an open state, the corners of the locking box 1101 are rotatably connected with a wedge plate 1103, the wedge plate 1103 is engaged with the ratchet groove 21, one side of the wedge plate 1103 is fixedly connected with a third spring 1102, and the other end of the third spring 1102 is fixedly connected to the outer wall of the locking box 1101;

[0047] like Figures 13 to 16As shown, the self-centering brake assembly 10 includes a diamond plate 1001, and a plurality of second springs 1007 are fixedly connected to one side of the diamond plate 1001 away from the limit strip 1002. The plurality of second springs 1007 are symmetrically distributed on the circumference, and can act more directly on the movement direction of the wheel, effectively slowing down the forward speed of the electric transport vehicle and improving the braking efficiency. The other end of the second spring 1007 is fixedly connected to a sleeve plate 1006, and the sleeve plate 1006 is slidably connected to the frame 3. The other side of the sleeve plate 1006 is fixedly connected to a plurality of brake wires 12, and a battery box 9 is installed at the other end of the brake wire 12. By installing the brake wire 12 in the battery box 9, passing through the battery box 9, and connecting it to the brake on the handle of the electric transport vehicle, the absence of the exposed brake wire 12 will make the vehicle look more concise, and also reduce possible entanglement and collision. Once the brake wire 12 needs to be repaired or replaced, only the battery box 9 needs to be opened, without To disassemble or adjust other components outside the vehicle, the battery box 9 is fixedly connected to the frame 3, one end of the brake line 12 is located in the battery box 9, the outer side of the sleeve 1006 away from the center is rotatably connected to a plurality of first connecting rods 1005, the other end of the first connecting rod 1005 is rotatably connected to the L-shaped brake plate 1004, the diamond plate 1001 is fixedly connected to the frame 3, one side of the diamond plate 1001 is fixedly connected to a plurality of limit bars 1002, and the plurality of limit bars 1002 are symmetrically distributed in a circle, the limit bar 1002 is slidably connected to a slider 1003 away from the side of the diamond plate 1001, and the other end of the slider 1003 is fixedly connected to the L-shaped brake plate 1004, which can reduce the friction heat generated during braking, which is beneficial to reducing the temperature of the brake system and extending the service life of the brake system, one end of the L-shaped brake plate 1004 is fixedly connected to a brake pad 1008, and the brake pad 1008 is engaged with the brake disc 13.

[0048] The working principle of this embodiment is as follows. The handle is fixedly mounted on the steering shaft 53, and the brake line 12 is connected and fixedly mounted on the handle. When the electric transport vehicle is moved and the electric transport vehicle needs to be braked, the brake on the handle is pressed, so that the brake line 12 pulls the sleeve 1006 to move along the linear direction of the frame 3 to the battery box 9. When the sleeve 1006 moves, the second spring 1007 is stretched. At the same time, the first connecting rod 1005 rotates relative to the sleeve 1006, thereby driving the L-shaped brake plate 1004 to slide on the limit bar 1002, so that the sliding rod 1108 connected to the other end of the L-shaped brake plate 1004 squeezes the brake disc 13. Under the action of friction, the purpose of deceleration is achieved, which can ensure that the brake disc 13 of each rear wheel 2 is subjected to a balanced clamping force, making the vehicle more stable during braking. Compared with the friction between the traditional brake pad 1008 and the brake disc 13, a closer contact can be achieved, thereby improving the braking efficiency, shortening the braking distance, and enhancing the safety of the vehicle.

[0049] In daily use, the second spring 1007 is in a contracted state, so that the sleeve plate 1006 and the diamond plate 1001 are in a relatively static state, so that the brake pad 1008 on the L-shaped brake plate 1004 is separated from the brake disc 13, thereby achieving the purpose of moving the electric transport vehicle. By operating the driver on the handle, the electric motor 4 is operated, and the power is transmitted to the front wheel 1 through the universal joint, so that the front wheel 1 rotates, thereby achieving the overall movement. When turning, the steering shaft 53 is driven to rotate by turning the handle, and at the same time, the second connecting plate 52 follows the synchronous rotation, thereby causing the first connecting plate 51 to rotate, thereby achieving the purpose of steering the front wheel 1. In addition, when the electric transport vehicle is moved and transported, the spring columns 73 on both sides are contracted, driving the fixed plate 74 to move up and down, while the first rotating plate 75 is rotated, driving the sleeve ring 76 to slide on the connecting rod 72, so that the first spring 77 is contracted and stretched, thereby achieving the purpose of shock absorption.

[0050] When the electric transport vehicle needs to be locked on the slope, the controller on the operating handle is used to operate the locking motor 1104 to drive the second rotating plate 1106 to rotate, so that the sliding rod 1108 moves in the arc groove 1107, and then the sliding plate 1110 moves in the sliding groove 1111 in the fixed plate 1109, so that it moves toward the center of the fixed plate 1109, driving the arc connecting plate 1105 to rotate, causing the other end of the arc connecting plate 1105 to pull the wedge plate 1103 to rotate. At this time, the third spring 1102 is stretched, so that The other end of the wedge plate 1103 is engaged with the ratchet groove 21, thereby limiting the movement of the rear wheel 2 and achieving the locking purpose. In addition, the controller on the handle is operated again to make the locking motor 1104 run to drive the second rotating plate 1106 to rotate in the opposite direction, so that the slide plate 1110 moves a distance in the opposite direction of the center of the fixed plate 1109, and then the second rotating plate 1106 stops running. Under the action of the contraction of the third spring 1102, the wedge plate 1103 rotates in the opposite direction, so that the wedge plate 1103 is separated from the ratchet groove 21, and the electric transport vehicle can move.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A lockable wheel set of an electric transport vehicle, comprising a plurality of front wheels (1) and rear wheels (2), characterized in that: The inner wall of the rear wheel (2) is provided with a ratchet groove (21), a brake disc (13) is installed on one side of the rear wheel (2), a plurality of the front wheels (1) and the rear wheels (2) are rotatably connected to a frame (3), the frame (3) is rotatably connected to the rear wheel (2) and the brake disc (13), a locking assembly (11) is fixedly connected to the through end of the frame (3), and a self-centering brake assembly (10) is provided at the connection between the rear wheel (2) and the frame (3); The locking assembly (11) comprises a locking box (1101), the through end of the vehicle frame (3) is fixedly connected to the locking box (1101), the interior of the locking box (1101) is a hollow structure, and the locking box (1101) is a hexagonal structure, the hexagonal end of the locking box (1101) is in an open state, a wedge plate (1103) is rotatably connected to the corner of the locking box (1101), the wedge plate (1103) is engaged with the ratchet groove (21), one side of the wedge plate (1103) is fixedly connected to a third spring (1102), and the other end of the third spring (1102) is fixedly connected to the outer wall of the locking box (1101); The locking box (1101) is fixedly connected to a fixed plate (1109) inside, and a plurality of slide grooves (1111) are provided on a side of the fixing plate (1109) away from the locking box (1101). The plurality of slide grooves (1111) are symmetrically distributed on a circle, and a slide plate (1110) is provided in the slide groove (1111). The slide plate (1110) is slidably connected to the fixing plate (1109), and the fixing plate (1109) is adapted to slide the slide plate (1111). 0) limiting, the fixed plate (1109) is rotatably connected to a second rotating plate (1106) on a side away from the locking box (1101), a locking motor (1104) is installed on a side of the locking box (1101) away from the frame (3), an output end of the locking motor (1104) is rotatably connected to the locking box (1101) and the fixed plate (1109), and a through end of the locking motor (1104) is fixedly connected to the second rotating plate (1106); The second rotating plate (1106) is provided with a plurality of arc grooves (1107) extending therethrough, the plurality of arc grooves (1107) being symmetrically distributed on a circle, a sliding rod (1108) being provided in the arc groove (1107), the sliding rod (1108) being fixedly connected to the sliding plate (1110), the sliding rod (1108) being slidably connected to the second rotating plate (1106), and the second rotating plate (1106) limiting the sliding rod (1108), one end of the sliding plate (1110) located outside the sliding groove (1111) being rotatably connected to an arc connecting plate (1105), the other end of the arc connecting plate (1105) being rotatably connected to a wedge plate (1103), the arc connecting plate (1105) being located at the opening of the locking box (1101), and the curved side surface of the arc connecting plate (1105) being arranged toward the center of the locking box (1101); The self-centering brake assembly (10) comprises a diamond plate (1001), the diamond plate (1001) is fixedly connected to the frame (3), one side of the diamond plate (1001) is fixedly connected to a plurality of limit bars (1002), the plurality of limit bars (1002) are arranged symmetrically distributed on a circle, the limit bar (1002) is slidably connected to a slider (1003) on the side away from the diamond plate (1001), the other end of the slider (1003) is fixedly connected to an L-shaped brake plate (1004), one end of the L-shaped brake plate (1004) is fixedly connected to a brake pad (1008), and the brake pad (1008) is engaged with the brake disc (13); A plurality of second springs (1007) are fixedly connected to one side of the diamond plate (1001) away from the limit strip (1002), and the plurality of second springs (1007) are symmetrically distributed on the circumference; a sleeve plate (1006) is fixedly connected to the other end of the second spring (1007); the sleeve plate (1006) is slidably connected to the frame (3); a plurality of brake lines (12) are fixedly connected to the other side of the sleeve plate (1006); a battery box (9) is installed at the other end of the brake line (12); the battery box (9) is fixedly connected to the frame (3); one end of the brake line (12) is located in the battery box (9); a plurality of first connecting rods (1005) are rotatably connected to the outer side of the sleeve plate (1006) away from the center; the other end of the first connecting rod (1005) is rotatably connected to the L-shaped brake plate (1004).

2. The lockable wheel set of an electric transport vehicle according to claim 1, characterized in that: An electric motor (4) is installed at the center of a side of the frame (3) away from the rear wheel (2); an output end of the electric motor (4) is rotatably connected to the frame (3); a through end of the electric motor (4) is rotatably connected to a plurality of universal joints; the other end of the universal joint connected to the electric motor (4) is transmitted to the front wheel (1); a steering assembly (5) is arranged on the top of the electric motor (4); and the steering assembly (5) is fixedly connected to the front wheel (1).

3. The lockable wheel set of an electric transport vehicle according to claim 2, characterized in that: The steering assembly (5) comprises a plurality of first connecting plates (51), the plurality of first connecting plates (51) being symmetrically arranged, the first connecting plates (51) being fixedly connected to the connecting shaft of the front wheel (1), the other end of the first connecting plate (51) being rotatably connected to a second connecting plate (52), the ends of the second connecting plates (52) on both sides away from the first connecting plate (51) being rotatably connected to a steering shaft (53), the top end of the steering shaft (53) being penetrated by a connecting plate (8) being slidably connected, and the bottom end surface of the connecting plate (8) being fixedly connected to a vibration reduction assembly (7).

4. The lockable wheel set of an electric transport vehicle according to claim 3, characterized in that: The vibration reduction assembly (7) comprises a plurality of fixing plates (74), the plurality of fixing plates (74) being distributed at both ends of the connecting plate (8), the top of the fixing plate (74) being fixedly connected to the bottom surface of the connecting plate (8), spring columns (73) being fixedly connected to both sides of the bottom surface of the fixing plate (74), the bottom of the spring column (73) being fixedly connected to a fixing block (71), the bottom of the fixing block (71) being fixedly connected to a support frame (6), and the support frame (6) being fixedly connected to the vehicle frame (3).

5. The lockable wheel set of the electric transport vehicle according to claim 4, characterized in that: A plurality of the fixing blocks (71) are fixedly connected with connecting rods (72) in pairs, and first rotating plates (75) are rotatably connected to the two sides of the bottom surface of the fixing plate (74), and a collar (76) is rotatably connected to the other end of the first rotating plate (75), and the collar (76) is slidably connected to the connecting rod (72), and a first spring (77) is fixedly connected between the collars (76) on both sides, and the first spring (77) does not contact the connecting rod (72).

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