Device and method for detecting brake performance of automobile

Abstract

The invention discloses a device and method for detecting the brake performance of an automobile, and the device comprises a platform, bearing frames fixedly connected to the two sides of the platform, and a wheel assembly which can run on the top of the platform and the top of the bearing frames, the interior of each bearing frame is provided with a lifting frame, and the two sides of the top of each lifting frame are fixedly connected with supports. A supporting roller is movably connected to the inner side of the support through a bearing, the top end of the supporting roller penetrates through the bearing frame and extends to the top of the bearing frame, the supporting roller is slidably connected with the bearing frame, the supporting roller can lift the wheel assembly in the upward sliding process, and a supporting structure is arranged at the bottom of the platform. Through the design of the platform and the bearing frame, a stable testing environment is provided for the wheel assembly, through the design of the lifting frame and the supporting rollers on the lifting frame, the wheel assembly can be conveniently lifted, braking performance detection can be conveniently carried out, the detection efficiency is improved, and meanwhile the testing accuracy is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive braking performance detection, and specifically to a device and method for automotive braking performance detection. Background Technique

[0002] Automotive braking performance detection is an important link to ensure driving safety. Its detection methods and evaluation criteria are all based on strict industry specifications. Automotive braking performance detection aims to evaluate the ability of a vehicle to stop within a short time, maintain the stability of the driving direction, and maintain a certain vehicle speed when driving down a long slope. These performances are directly related to traffic safety. Therefore, braking performance detection is an important part of automotive safety performance detection.

[0003] For example, the patent application number disclosed on the Chinese Patent Network is: 202022152873.8, and the patent name is: An automotive braking performance detection device, including a braking plate, lifting support columns, impact plates, load-bearing plates, and a bearing plate. One end of several lifting support columns is welded to the lower surface of the braking plate. Fixed grooves are provided on one surface of several braking plates. Several impact plates are respectively installed in the fixed grooves. One surface of several load-bearing plates is welded to the inner surface of the braking plate. A number of limit grooves are provided on the upper surface of the bearing plate. One surface of several braking plates is installed in the limit grooves. The main purpose of the present invention is to provide an automotive braking performance detection device. By adding its corresponding functional structures and effectively cooperating with the use environment and requirements, it can effectively solve problems such as insufficient applicability of the automotive braking performance detection device during operation.

[0004] However, the horizontal height of the existing braking performance detection device is higher than the height of the platform. Therefore, it is necessary to lift the wheels. The overall weight of the vehicle is too high, and it cannot effectively drive to the top of the raised detection roller during the moving process, resulting in the need to additionally lift and move the vehicle through a hoisting device, which is time-consuming and laborious and affects the detection efficiency.

[0005] Therefore, it is necessary to design and transform the device and method for automotive braking performance detection. Summary of the Invention

[0006] To solve the problems raised in the above background technique, the purpose of the present invention is to provide a device and method for automotive braking performance detection, which has the advantage of being convenient for loading the vehicle for detection, and solves the problem that the horizontal height of the existing braking performance detection device is higher than the height of the platform. Therefore, it is necessary to lift the wheels. The overall weight of the vehicle is too high, and it cannot effectively drive to the top of the raised detection roller during the moving process, resulting in the need to additionally lift and move the vehicle through a hoisting device, which is time-consuming and laborious and affects the detection efficiency.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A device and method for automotive braking performance detection, including a platform; Carrier frames fixedly connected to both sides of the platform; Wheel assemblies capable of traveling on the top of the platform and the carrier frames; An elevating frame is arranged inside the carrier frame. Both sides of the top of the elevating frame are fixedly connected with brackets. The inner sides of the brackets are movably connected with supporting rollers through bearings. The tops of the supporting rollers penetrate through the carrier frame and extend to the top of the carrier frame. The supporting rollers are slidably connected with the carrier frame. During the upward sliding process of the supporting rollers, the wheel assemblies can be lifted. A supporting structure is arranged at the bottom of the platform, and the supporting structure can control the vertical lifting of the elevating frame.

[0008] Preferably, as the present invention, the supporting structure includes a connecting block fixedly connected to the bottom of the platform. The outer side of the connecting block is movably connected with a crank through a pin shaft. One side of the crank far away from the connecting block extends to the outside of the elevating frame. A stress rod located inside the crank is fixedly connected to the surface of the elevating frame. The stress rod is slidably connected with the crank. A transmission structure is arranged on the surface of the platform, and the transmission structure can drive a plurality of cranks to swing synchronously by using the lever principle.

[0009] Preferably, as the present invention, the transmission structure includes hydraulic cylinders fixedly connected to both sides of the top of the platform. The output ends of the hydraulic cylinders penetrate through the platform and extend to the bottom of the platform. The output ends of the hydraulic cylinders are fixedly connected with a connecting frame located at the bottom of the platform. Transmission rods located inside the cranks are fixedly connected to both the front and the back sides of the connecting frame. The transmission rods are slidably connected with the cranks.

[0010] Preferably, as the present invention, legs are fixedly connected to both sides of the bottom of the connecting frame. The bottoms of the legs are flush with the bottom of the carrier frame.

[0011] Preferably, as the present invention, movable blocks are fixedly connected to both the front and the back sides of the carrier frame. The inner sides of the movable blocks are movably connected with baffle plates through pin shafts. One side of the baffle plate far away from the movable block extends to the outside of the wheel assembly. The baffle plate can limit the wheel assembly to move on the surface of the supporting roller.

[0012] Preferably, as the present invention, an extension plate is fixedly connected to the outside of the elevating frame. One side of the extension plate far away from the elevating frame extends to the outside of the carrier frame and is fixedly connected with a toothed plate. Gears are fixedly connected to both ends of the baffle plate through pin shafts. The gears are meshed with the toothed plate. During the rising process of the elevating plate, the toothed plate can be used to push the gears to rotate and swing to the outside of the wheel assembly.

[0013] Preferably, as the present invention, a gradient frame is fixedly connected to the outside of the carrier frame. The top of the gradient frame is inclined.

[0014] A device and method for detecting the braking performance of an automobile, comprising the following steps: Preparation stage: The automobile is driven or towed to the top of the platform and the carrier of the detection device. Ensure that the wheel assembly is placed on the platform and prepare for braking performance detection. At this time, the lifting frame is located at a lower position inside the carrier, and the top end of the support roller does not extend beyond the top of the carrier; Start the transmission structure: Start the transmission structure. The hydraulic cylinder starts to work, and its output end pushes the connecting frame downward to provide power for subsequent lifting actions. Since transmission rods are fixedly connected to both sides of the front and back of the connecting frame, and the transmission rods are slidably connected to the crank, as the connecting frame descends, the transmission rods will push the crank to swing around the pin shaft. The other end of the crank extends to the outside of the lifting frame and is slidably connected to the stress rod. Therefore, the swing of the crank will drive the stress rod and the lifting frame to rise together; Lift the wheel assembly: As the lifting frame rises, the top end of the support roller gradually extends beyond the top of the carrier and contacts the wheel assembly. Since the wheel assembly can travel on the platform and the top of the carrier, when the support roller contacts the wheel assembly, the wheel assembly will be gradually lifted. At this time, the weight of the wheel assembly is mainly borne by the support roller and no longer presses completely on the platform; Keep the wheels stable: Baffles are provided on both the front and back of the carrier. The baffles are movably connected to the movable blocks through pin shafts. When the lifting frame rises, the toothed plate on the extension plate will push the gears at both ends of the baffle to rotate, causing the baffle to swing to the outside of the wheel assembly. After the baffle swings to the outside of the wheel assembly, it can limit the movement range of the wheel assembly and make it move on the surface of the support roller.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Through the design of the platform and the carrier, the present invention provides a stable test environment for the wheel assembly. The design of the lifting frame and the support roller thereon enables the wheel assembly to be conveniently lifted, facilitating braking performance detection, improving the detection efficiency, and ensuring the accuracy of the test.

[0016] 2. Through the sliding connection between the crank and the stress rod, the present invention realizes the vertical lifting of the lifting frame. It not only has a simple structure, but also can conveniently control the lifting of the lifting frame through the transmission structure, making the operation of the entire device more convenient. At the same time, the lever principle of the crank makes the lifting process more labor-saving, improving the practicality of the device.

[0017] 3. By using a hydraulic cylinder as the power source and utilizing the sliding connection between the connecting frame, the transmission rods and the crank, the present invention realizes the precise control of the lifting frame. The use of the hydraulic cylinder makes the lifting process stable and controllable, improving the detection accuracy and stability. In addition, the output end of the hydraulic cylinder can be conveniently adjusted to meet the detection requirements of different vehicle models and wheel sizes.

[0018] 4. Through the design of the legs at the bottom of the connection frame, the present invention not only enhances the stability of the entire device, but also makes the bottom of the device flush with the bottom of the carrier frame, avoiding possible shaking or tilting during the lifting process, and further improving the safety and accuracy of detection.

[0019] 5. Through the design of the baffles on the front and back of the carrier frame, the present invention can effectively limit the moving range of the wheel assembly, enabling it to move stably on the surface of the support roller. This not only improves the stability of the wheel assembly during the detection process, but also avoids detection errors caused by the movement of the wheels.

[0020] 6. Through the design of the extension plate and the toothed plate on the outside of the lifting frame, as well as the gear meshing structure at both ends of the baffle, during the rising process of the lifting frame, the toothed plate can push the gear to rotate and swing to the outside of the wheel assembly, not only realizing the automatic swing of the baffle, but also improving the automation degree of the device.

[0021] 7. Through the design of the gradient frame on the outside of the carrier frame, with its top set to be inclined, it helps the wheel assembly to smoothly transition to the support roller during the lifting process, not only improving the smoothness of the lifting process, but also avoiding impacts and vibrations caused by the sudden lifting of the wheels. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a front view structural schematic diagram of the present invention; Figure 3 is a partial structural schematic diagram of the present invention; Figure 4 is a schematic transmission structure diagram of the present invention; Figure 5 is a schematic baffle structure diagram of the present invention; Figure 6 of the present invention Figure 2 is an enlarged structural schematic diagram at A in

[0023] In the figure: 1. Platform; 2. Carrier frame; 3. Wheel assembly; 4. Lifting frame; 5. Bracket; 6. Support roller; 7. Support structure; 8. Connection block; 9. Crank; 10. Stress rod; 11. Transmission structure; 12. Hydraulic cylinder; 13. Connection frame; 14. Transmission rod; 15. Leg; 16. Movable block; 17. Baffle; 18. Extension plate; 19. Toothed plate; 20. Gear; 21. Gradient frame. DETAILED DESCRIPTION OF THE INVENTION

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] As Figures 1 to 6 shown, a device and method for detecting the braking performance of an automobile provided by the present invention includes a platform 1; carrying frames 2 fixedly connected to both sides of the platform 1; wheel assemblies 3 capable of traveling on the top of the platform 1 and the carrying frames 2;

[0025] As Figures 1 to 6 shown, a device and method for detecting the braking performance of an automobile provided by the present invention includes a platform 1; carrying frames 2 fixedly connected to both sides of the platform 1; wheel assemblies 3 capable of traveling on the top of the platform 1 and the carrying frames 2; An elevating frame 4 is arranged inside the carrying frame 2. Both sides of the top of the elevating frame 4 are fixedly connected with brackets 5. The inner sides of the brackets 5 are movably connected with supporting rollers 6 through bearings. The top ends of the supporting rollers 6 penetrate through the carrying frame 2 and extend to the top of the carrying frame 2. The supporting rollers 6 are slidably connected with the carrying frame 2. During the upward sliding process of the supporting rollers 6, the wheel assemblies 3 can be lifted. A supporting structure 7 is arranged at the bottom of the platform 1, and the supporting structure 7 can control the vertical lifting of the elevating frame 4.

[0026] Referring Figure 2 to, the supporting structure 7 includes a connecting block 8 fixedly connected to the bottom of the platform 1. The outer side of the connecting block 8 is movably connected with a crank 9 through a pin shaft. One side of the crank 9 away from the connecting block 8 extends to the outside of the elevating frame 4. A stress rod 10 located inside the crank 9 is fixedly connected to the surface of the elevating frame 4. The stress rod 10 is slidably connected with the crank 9. A transmission structure 11 is arranged on the surface of the platform 1, and the transmission structure 11 can drive a plurality of cranks 9 to swing synchronously by using the lever principle.

[0027] As a technical optimization scheme of the present invention, the vertical lifting of the elevating frame 4 is realized through the sliding connection between the crank 9 and the stress rod 10. The structure is not only simple, but also the lifting of the elevating frame 4 can be conveniently controlled through the transmission structure 11, making the operation of the entire device more convenient. At the same time, the lever principle of the crank 9 makes the lifting process more labor-saving and improves the practicability of the device.

[0028] Referring Figure 4 to, the transmission structure 11 includes hydraulic cylinders 12 fixedly connected to both sides of the top of the platform 1. The output ends of the hydraulic cylinders 12 penetrate through the platform 1 and extend to the bottom of the platform 1. The output ends of the hydraulic cylinders 12 are fixedly connected with a connecting frame 13 located at the bottom of the platform 1. Transmission rods 14 located inside the crank 9 are fixedly connected to both sides of the front and back of the connecting frame 13. The transmission rods 14 are slidably connected with the crank 9.

[0029] As a technical optimization solution of the present invention, by using the hydraulic cylinder 12 as the power source and utilizing the sliding connection of the connecting frame 13 and the transmission rod 14 with the crank 9, the precise control of the lifting frame 4 is realized. The use of the hydraulic cylinder 12 makes the lifting process stable and controllable, improving the accuracy and stability of the detection. In addition, the output end of the hydraulic cylinder 12 can be conveniently adjusted to adapt to the detection requirements of different vehicle models and wheel sizes.

[0030] Reference Figure 4 , both sides of the bottom of the connecting frame 13 are fixedly connected with legs 15, and the bottoms of the legs 15 are flush with the bottom of the bearing frame 2.

[0031] As a technical optimization solution of the present invention, through the design of the legs 15 at the bottom of the connecting frame 13, not only the stability of the entire device is enhanced, but also the bottom of the device is flush with the bottom of the bearing frame 2, avoiding the possible shaking or tilting phenomenon during the lifting process, and further improving the safety and accuracy of the detection.

[0032] Reference Figure 5 , both the front and back of the bearing frame 2 are fixedly connected with movable blocks 16. The inner sides of the movable blocks 16 are movably connected with baffles 17 through pins. One side of the baffle 17 away from the movable block 16 extends to the outside of the wheel assembly 3, and the baffle 17 can restrict the wheel assembly 3 to move on the surface of the support roller 6.

[0033] As a technical optimization solution of the present invention, through the design of the baffles 17 on the front and back of the bearing frame 2, the moving range of the wheel assembly 3 can be effectively restricted, enabling it to move stably on the surface of the support roller 6. This not only improves the stability of the wheel assembly 3 during the detection process but also avoids detection errors caused by wheel movement.

[0034] Reference Figure 6 , an extension plate 18 is fixedly connected to the outside of the lifting frame 4. One side of the extension plate 18 away from the lifting frame 4 extends to the outside of the bearing frame 2 and is fixedly connected with a toothed plate 19. Both ends of the baffle 17 are fixedly connected with gears 20 through pins, and the gears 20 mesh with the toothed plate 19. During the rising process of the lifting plate, the toothed plate 19 can be used to push the gears 20 to rotate and swing to the outside of the wheel assembly 3.

[0035] As a technical optimization solution of the present invention, through the design of the extension plate 18 and the toothed plate 19 on the outside of the lifting frame 4, and the meshing structure of the gears 20 at both ends of the baffle 17, during the rising process of the lifting frame 4, the toothed plate 19 can push the gears 20 to rotate and swing to the outside of the wheel assembly 3. This not only realizes the automatic swing of the baffle 17 but also improves the automation degree of the device.

[0036] Reference Figure 2, a gradient frame 21 is fixedly connected to the outside of the carrier frame 2, and the top of the gradient frame 21 is set to be inclined.

[0037] As a technical optimization scheme of the present invention, through the design of the gradient frame 21 on the outside of the carrier frame 2, the top of which is set to be inclined, it helps the wheel assembly 3 to smoothly transition to the support roller 6 during the lifting process, not only improving the smoothness of the lifting process, but also avoiding the impact and vibration caused by the sudden lifting of the wheels.

[0038] Reference Figure 1 , a device and method for detecting the braking performance of an automobile, comprising the following steps: Preparation stage: The automobile is driven or towed to the top of the platform 1 and the carrier frame 2 of the detection device, ensuring that the wheel assembly 3 is placed on the platform 1 and ready for braking performance detection. At this time, the lifting frame 4 is located at a lower position inside the carrier frame 2, and the top end of the support roller 6 does not extend out of the top of the carrier frame 2; Start the transmission structure 11: Start the transmission structure 11, the hydraulic cylinder 12 starts to work, and its output end pushes the connecting frame 13 downward to provide power for the subsequent lifting action. Since both sides of the front and back of the connecting frame 13 are fixedly connected with transmission rods 14, and the transmission rods 14 are slidably connected with the crank 9, therefore, as the connecting frame 13 descends, the transmission rod 14 will push the crank 9 to swing around the pin shaft. The other end of the crank 9 extends to the outside of the lifting frame 4 and is slidably connected with the force receiving rod 10. Therefore, the swing of the crank 9 will drive the force receiving rod 10 and the lifting frame 4 to rise together; Lift the wheel assembly 3: As the lifting frame 4 rises, the top end of the support roller 6 gradually extends out of the top of the carrier frame 2 and contacts the wheel assembly 3. Since the wheel assembly 3 can travel on the top of the platform 1 and the carrier frame 2, when the support roller 6 contacts the wheel assembly 3, the wheel assembly 3 will be gradually lifted. At this time, the weight of the wheel assembly 3 is mainly borne by the support roller 6 and no longer completely presses on the platform 1; Keep the wheels stable: Baffles 17 are arranged on both the front and back of the carrier frame 2. The baffles 17 are movably connected to the movable blocks 16 through pin shafts. When the lifting frame 4 rises, the toothed plates 19 on the extension plates 18 will push the gears 20 at both ends of the baffles 17 to rotate, causing the baffles 17 to swing to the outside of the wheel assembly 3. After the baffles 17 swing to the outside of the wheel assembly 3, they can limit the movement range of the wheel assembly 3 and keep it moving on the surface of the support roller 6.

[0039] Working principle and usage process of the present invention: The vehicle is driven or towed to the top of the platform 1 and the carrier 2 of the detection device. The wheel assembly 3 is placed on the platform 1 and is ready for braking performance detection. At this time, the lifting frame 4 is at a lower position inside the carrier 2, and the top end of the support roller 6 does not extend out of the top of the carrier 2. Therefore, the wheel assembly 3 is not lifted, and the vehicle can drive normally to the top of the platform 1. Next, the transmission structure 11 is started. The hydraulic cylinder 12 starts to work, and its output end pushes the connecting frame 13 downward. Since both sides of the front and back of the connecting frame 13 are fixedly connected with transmission rods 14, and the transmission rods 14 are slidably connected with the crank 9, as the connecting frame 13 descends, the transmission rods 14 will push the crank 9 to swing around the pin shaft. Since the other end of the crank 9 extends to the outside of the lifting frame 4 and is slidably connected with the force-bearing rod 10, the swing of the crank 9 will drive the force-bearing rod 10 and the lifting frame 4 to rise together. As the lifting frame 4 rises, the top end of the support roller 6 gradually extends out of the top of the carrier 2 and contacts the wheel assembly 3. Since the wheel assembly 3 can travel on the top of the platform 1 and the carrier 2, when the support roller 6 contacts the wheel assembly 3, the wheel assembly 3 will be gradually lifted. At this time, the weight of the wheel assembly 3 is mainly borne by the support roller 6 and no longer presses completely on the platform 1, and the power generated when the wheel assembly 3 rotates will be offset by the support roller 6 to prevent the wheel assembly 3 from moving. In order to keep the wheel assembly 3 moving stably on the surface of the support roller 6, baffles 17 are provided on both the front and back of the carrier 2. The baffles 17 are movably connected to the movable blocks 16 through pin shafts and can extend to the outside of the wheel assembly 3. When the lifting frame 4 rises, the toothed plates 19 on the extension plate 18 will push the gears 20 at both ends of the baffle 17 to rotate, causing the baffle 17 to swing to the outside of the wheel assembly 3, thereby restricting the movement range of the wheel assembly 3 and keeping it moving on the surface of the support roller 6. After the detection is completed, the output end of the hydraulic cylinder 12 retracts, the connecting frame 13 rises, and the transmission rods 14 and the crank 9 swing accordingly, causing the force-bearing rod 10 and the lifting frame 4 to descend together. The top end of the support roller 6 gradually retracts into the carrier 2, and the wheel assembly 3 falls back onto the platform 1. At this time, the vehicle can be driven or towed away from the detection device to complete the entire detection process.

[0040] To sum up: For the device and method for detecting the braking performance of an automobile, through the design of the platform 1 and the carrier 2, a stable test environment is provided for the wheel assembly 3. The design of the lifting frame 4 and the support roller 6 thereon enables the wheel assembly 3 to be easily lifted, facilitating the braking performance detection, improving the detection efficiency, and ensuring the accuracy of the test.

[0041] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0042] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An apparatus and method for detecting the braking performance of an automobile, comprising a platform (1); Carrier frames (2) fixedly connected to both sides of the platform (1); Wheel assemblies (3) capable of traveling on the top of the platform (1) and the carrier frames (2); It is characterized in that: A lifting frame (4) is arranged inside the carrier frame (2). Both sides of the top of the lifting frame (4) are fixedly connected with brackets (5). The inner sides of the brackets (5) are movably connected with support rollers (6) through bearings. The top ends of the support rollers (6) penetrate through the carrier frame (2) and extend to the top of the carrier frame (2). The support rollers (6) are slidably connected with the carrier frame (2). During the upward sliding process of the support rollers (6), the wheel assemblies (3) can be lifted. A support structure (7) is arranged at the bottom of the platform (1), and the support structure (7) can control the vertical lifting of the lifting frame (4).

2. The device and method for detecting the braking performance of an automobile according to claim 1, characterized in that: The support structure (7) includes a connection block (8) fixedly connected to the bottom of the platform (1). The outer side of the connection block (8) is movably connected with a crank (9) through a pin shaft. One side of the crank (9) away from the connection block (8) extends to the outside of the lifting frame (4). A stress rod (10) located inside the crank (9) is fixedly connected to the surface of the lifting frame (4). The stress rod (10) is slidably connected with the crank (9). A transmission structure (11) is arranged on the surface of the platform (1), and the transmission structure (11) can drive a plurality of cranks (9) to swing synchronously by using the lever principle.

3. The device and method for detecting the braking performance of an automobile according to claim 2, characterized in that: The transmission structure (11) includes hydraulic cylinders (12) fixedly connected to both sides of the top of the platform (1). The output ends of the hydraulic cylinders (12) penetrate through the platform (1) and extend to the bottom of the platform (1). The output ends of the hydraulic cylinders (12) are fixedly connected with a connection frame (13) located at the bottom of the platform (1). Transmission rods (14) located inside the crank (9) are fixedly connected to both the front and the back sides of the connection frame (13). The transmission rods (14) are slidably connected with the crank (9).

4. A device and method for detecting the braking performance of an automobile according to claim 3, characterized in that: Both sides of the bottom of the connection frame (13) are fixedly connected with legs (15), and the bottoms of the legs (15) are flush with the bottom of the carrier frame (2).

5. The device and method for detecting the braking performance of an automobile according to claim 4, characterized in that: Moving blocks (16) are fixedly connected to both the front and the back of the carrier frame (2). The inner sides of the moving blocks (16) are movably connected with baffles (17) through pin shafts. One side of the baffle (17) away from the moving block (16) extends to the outside of the wheel assembly (3). The baffle (17) can limit the wheel assembly (3) to keep it moving on the surface of the support roller (6).

6. The device and method for detecting the braking performance of an automobile according to claim 5, characterized in that: An extension plate (18) is fixedly connected to the outside of the lifting frame (4). One side of the extension plate (18) away from the lifting frame (4) extends to the outside of the carrier frame (2) and is fixedly connected with a toothed plate (19). Gears (20) are fixedly connected to both ends of the baffle (17) through pin shafts. The gears (20) are meshed with the toothed plate (19). During the upward movement of the lifting plate, the toothed plate (19) can be used to push the gears (20) to rotate and swing to the outside of the wheel assembly (3).

7. The device and method for detecting the braking performance of an automobile according to claim 6, characterized in that: A gradient frame (21) is fixedly connected to the outside of the carrier frame (2), and the top of the gradient frame (21) is arranged in an inclined shape.

8. The device and method for detecting the braking performance of an automobile according to claim 7, characterized in that: It includes the following steps: Preparation stage: The vehicle is driven or towed to the top of the platform (1) and the carrier frame (2) of the detection device, ensuring that the wheel assembly (3) is placed on the platform (1) and preparing for the braking performance test. At this time, the lifting frame (4) is located at a lower position inside the carrier frame (2), and the top end of the support roller (6) does not extend out of the top of the carrier frame (2). Start the transmission structure (11): Start the transmission structure (11), the hydraulic cylinder (12) starts to work, and its output end pushes the connecting frame (13) downward to provide power for subsequent lifting actions. Since transmission rods (14) are fixedly connected to both sides of the front and back of the connecting frame (13), and the transmission rods (14) are slidably connected to the crank (9), as the connecting frame (13) descends, the transmission rods (14) will push the crank (9) to swing around the pin shaft. The other end of the crank (9) extends to the outside of the lifting frame (4) and is slidably connected to the force-bearing rod (10). Therefore, the swing of the crank (9) will drive the force-bearing rod (10) and the lifting frame (4) to rise together. Lifting of the wheel assembly (3): As the lifting frame (4) rises, the top end of the support roller (6) gradually extends out of the top of the carrier frame (2) and contacts the wheel assembly (3). Since the wheel assembly (3) can travel on the platform (1) and the top of the carrier frame (2), when the support roller (6) contacts the wheel assembly (3), the wheel assembly (3) will be gradually lifted. At this time, the weight of the wheel assembly (3) is mainly borne by the support roller (6) and no longer presses completely on the platform (1). Keep the wheels stable: Baffles (17) are arranged on both the front and back of the carrier frame (2). The baffles (17) are movably connected to the movable blocks (16) through pin shafts. When the lifting frame (4) rises, the toothed plates (19) on the extension plates (18) will push the gears (20) at both ends of the baffles (17) to rotate, causing the baffles (17) to swing to the outside of the wheel assembly (3). After the baffles (17) swing to the outside of the wheel assembly (3), the moving range of the wheel assembly (3) can be restricted, making it move on the surface of the support roller (6).

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