Automobile speed test bench

Abstract

The utility model provides an automobile speed test bench, which comprises a bench main body, a lifting mechanism is arranged in the bench main body, one end of the lifting mechanism is connected with a lifting plate, and one end of the lifting mechanism is connected with a driving piece; limiting grooves used for positioning automobile wheels are formed in the positions, located on the two sides of the lifting plate, in the rack body. And a brake speed measurement mechanism is arranged in the rack main body corresponding to the position of the limiting part. According to the test bench, the limiting grooves are formed in the bench body, positioning points of the parking position of an automobile on the bench body are provided for a driver through the limiting grooves, when the automobile is driven to the position above the bench body, only wheels of the automobile need to be located in the middle of the limiting grooves in the two sides of the lifting plate, and positioning and speed measuring work can be rapidly carried out; a driver does not need to frequently move the position, and the detection efficiency of the automobile is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of automotive performance testing equipment, specifically an automotive speed testing bench. Background Technology

[0002] After pure electric vehicles entered the market, they became the first choice for people in the market because they had lower operating costs than fuel vehicles and were more energy-efficient and environmentally friendly. However, pure electric vehicles generally need to undergo speed testing after production and during annual inspections, which involves moving the car to a testing platform, starting the car, and testing its speed.

[0003] Currently, existing testing platforms on the market are plate-like structures. Workers drive a car onto the plate structure, connecting the car's wheels to a speed measuring device to measure its speed. For example, the vehicle bridge disclosed in CN111693301B, a comprehensive performance testing bench for new energy vehicles, can detect vehicle speed. However, when assisting in speed measurement, because the driver drives the car onto the bench, and there is no corresponding limiting mechanism on the top of the bench, the car's position often deviates significantly from the speed measuring device. Even if the speed measuring device has a corresponding position adjustment mechanism, its limited adjustable distance prevents quick alignment with the car. The driver needs to move the car multiple times to align the wheels with the speed measuring device, resulting in a significant time commitment and low speed measurement efficiency. Utility Model Content

[0004] To address the problem that existing vehicle speed testing benches have an upper limit structure, requiring drivers to move the vehicle multiple times to adjust its position on the bench, resulting in long positioning times and low speed testing efficiency, this invention provides a vehicle speed testing bench.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model proposes a vehicle speed test bench, including a bench body, a lifting mechanism installed inside the bench body, a lifting plate connected to one end of the lifting mechanism, and a driving component connected to the other end of the lifting mechanism;

[0007] The main body of the platform is provided with limiting grooves for positioning automobile wheels on both sides of the lifting plate.

[0008] A braking speed measuring mechanism is provided inside the main body of the test bench at the position corresponding to the limiting part.

[0009] Preferably, the main body of the platform includes a fixed frame, a fixed platform is installed inside the fixed frame, and a mounting cavity is provided on the fixed platform. The lifting mechanism and the driving component are installed inside the mounting cavity.

[0010] The top of the fixed platform is provided with a mounting groove, one side of which communicates with the mounting cavity, and the lifting plate is installed in the mounting groove;

[0011] Limiting mechanisms are installed at both ends of the lifting plate inside the mounting cavity, with one end of each limiting mechanism installed in the limiting groove, and a lifting mechanism connected to the bottom of the limiting mechanism.

[0012] Preferably, the limiting mechanism includes a connecting rod, the bottom of which is connected to the top of the lifting mechanism. A mounting plate is connected to the connecting rod, and two limiting blocks are mounted on the mounting plate. The limiting blocks are installed in the limiting groove, the top of which extends out of the limiting groove, and the top of which is 5-8 cm higher than the top surface of the fixed platform.

[0013] Preferably, the lifting mechanism includes a rotating cylinder, the bottom of which is connected to the driving component;

[0014] A threaded hole is provided on the top end face of the rotating cylinder, and a lead screw is screwed into the threaded hole. The top of the lead screw located at the bottom of the limiting mechanism is connected to the connecting rod, and the top of the lead screw located at the bottom of the lifting plate is connected to the bottom of the lifting plate.

[0015] Preferably, the driving component includes a drive motor, which is connected to an active conveying mechanism, which is connected to the rotating cylinder located at the bottom of the lifting plate; the active conveying mechanism is connected to an inclined conveying mechanism via a meshing mechanism, which is connected to the rotating cylinder located at the bottom of the limiting mechanism.

[0016] Preferably, the active conveying mechanism includes an active disk, which is mounted on the output shaft of the drive motor. The active disk is connected to a driven disk via a transverse transmission belt. A first drive disk is connected to the driven disk via a longitudinal transmission belt. The first drive disk is connected to the rotating cylinder located at the bottom of the lifting plate.

[0017] The engagement mechanism is coaxially connected to the driven disc.

[0018] Preferably, the meshing mechanism includes a driving gear and a driven gear. The driving gear is coaxially connected to the driven disc, the driven gear is mounted on the side of the driving gear, and the driving gear and the driven gear mesh with each other. The inclined conveying mechanism is coaxially connected to the driven gear.

[0019] Preferably, the inclined conveying mechanism includes a rotating disk, which is coaxially mounted on the top of the driven gear. The rotating disk is connected to a second driving disk via an inclined transmission belt. The top of the second driving disk is coaxially connected to the rotating cylinder at the bottom of the limiting mechanism. The second driving disk rotates in the opposite direction to the first driving disk.

[0020] Preferably, a ramp is connected to one end face of the fixing frame, and the bottom of the ramp is flush with the top of the fixing platform.

[0021] Preferably, an anti-slip strip is provided on the inclined surface of the ramp.

[0022] Compared with the prior art, the present invention has the following beneficial technical effects:

[0023] This utility model proposes a vehicle speed testing bench. The bench features limiting grooves on its main body, providing the driver with positioning points for the vehicle's parking position. When driving the vehicle above the bench, simply positioning the wheels between the limiting grooves on both sides of the lifting plate allows for rapid speed measurement without frequent driver movement. This enables the driver to park the vehicle on the bench in one go, facilitating quick alignment of the vehicle wheels with the braking speed measuring mechanism and improving vehicle testing efficiency.

[0024] Furthermore, this test bench incorporates a limiting mechanism installed within a limiting groove, connected to a lifting mechanism. The top of the limiting block in the limiting mechanism extends 5-8 cm above the top surface of the fixed platform. By positioning the car wheels using the limiting block, the positioning time of the car wheels on the main body of the test bench is further shortened, improving positioning efficiency. Additionally, a lifting mechanism is installed on the connecting rod within the limiting mechanism. When the lifting plate raises the car, the lifting mechanism connected to the limiting mechanism lowers the limiting block, preventing the limiting block from affecting the rotation of the car wheels.

[0025] Furthermore, the lifting mechanism in this test bench utilizes a precise fit between a threaded hole at the top of the rotating cylinder and a lead screw. The rotating cylinder and the lead screw are connected by threads, which greatly improves the lifting accuracy, making the entire lifting process more stable and reliable, reducing errors caused by mechanical wear, and further improving the positioning between the car wheels and the brake speed measuring mechanism.

[0026] Furthermore, a ramp is connected to one end face of the fixed frame in this test bench. The bottom of the ramp is flush with the top of the fixed frame, which allows the driver to smoothly move the car onto the fixed frame. In addition, an anti-slip strip is provided on the ramp to prevent the car wheels from slipping on the ramp and to ensure that the car smoothly enters the main body of the test bench. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the automobile speed test bench proposed in this utility model;

[0028] Figure 2 This is a schematic diagram of the connection structure between the lifting plate and the limiting mechanism in the automobile speed test bench proposed in this utility model.

[0029] Figure 3 This is a schematic diagram of the connection structure of the lifting mechanism, meshing mechanism and active transmission mechanism in the automobile speed test bench proposed in this utility model.

[0030] Figure 4 This is a partially enlarged schematic diagram of the limiting mechanism in the automobile speed test bench proposed in this utility model;

[0031] Figure 5 This utility model presents a schematic diagram of the braking speed measuring mechanism in an automobile speed test bench.

[0032] In the attached diagram: 1. Slope; 2. Main body of the platform; 21. Fixed frame; 211. Slide groove; 22. Fixed platform; 221. Limiting groove; 222. Mounting groove; 3. Braking and speed measuring mechanism; 4. Lifting plate; 5. Drive motor; 6. Limiting mechanism; 61. Limiting block; 62. Connecting rod; 7. Lifting mechanism; 71. Rotating cylinder; 72. Lead screw; 8. Active transmission mechanism; 81. Active disc; 82. Transverse transmission belt; 83. Driven disc; 84. Longitudinal transmission belt; 85. First drive disc; 9. Meshing mechanism; 91. Drive gear; 92. Driven gear; 10. Inclined conveying mechanism; 101. Rotary disc; 102. Second drive disc; 103. Inclined transmission belt. Detailed Implementation

[0033] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In this utility model, 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, an electrical connection, or a communication 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 utility model according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature 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," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0039] See Figures 1-5This utility model discloses a car speed test bench, including a ramp 1. The end face of the ramp 1 is a right-angled triangle, with the longer right-angled side of the triangle touching the ground to form a pad with a certain inclination, used to assist the car in moving to the top of the test bench. One end of the bench body 2 is connected to the end face of the ramp 1, which is located on the other right-angled side of the triangle. The bench body 2 is used to support the car. A brake speed measuring mechanism 3 is symmetrically arranged on the inner end face of the bench body 2, located inside the bench body 2 near the upper end, for performing car speed testing. A brake speed measuring mechanism 3 is located at the top center of the bench body 2. A lifting plate 4 is installed at the test bench body 2, parallel to the bottom end face of the test bench body 2 and positioned in the middle of the test bench body 2. The lifting plate 4 is used to lift the car within the test bench body 2, making the car wheels level with the brake speed measuring mechanism 3. The parallelism between the lifting plate 4 and the bottom end face of the test bench body 2 allows the car to be lifted smoothly on the test bench body 2, propelling the car vertically within the test bench body 2 and adjusting the car's height position within the test bench body 2. This allows for height adjustment without requiring the driver to move the car, improving the stability and safety of lifting the car during speed testing. A limit mechanism 6 is installed within the test bench body 2 corresponding to the position of the brake speed measuring mechanism 3, used to limit the car wheels. The limit mechanism 6 and the lifting plate 4 are connected to a lifting mechanism 7, with a transmission component connected to the bottom of the lifting mechanism 7. When the car moves into the test bench body 2, the transmission component causes the lifting mechanism 7 to move, pushing the limit mechanism 6 to limit the car. When in use, the driver first needs to drive the car up the ramp 1 to the top of the main body 2 of the platform. When driving, the driver needs to drive the car wheels into the inside of the limiting mechanism 6 according to the position of the limiting mechanism 6. After reaching the appropriate position, the driver only needs to start the drive component to drive the lifting mechanism 7 to work, so that the lifting mechanism 7 drives the limiting mechanism 6 at its top to descend, so that the lifting plate 4 rises. When the lifting plate 4 rises, it will push the entire car body to rise, thereby separating the car wheels from the surface of the main body 2 of the platform. Then, the moving mechanism inside the braking speed measuring mechanism 3 is adjusted according to the position of the wheels so that it corresponds to the position of the wheels. At the same time, the car and the braking speed measuring mechanism 3 are started to move, so that the speed of the car wheels can be measured by the braking speed measuring mechanism 3 in time when they are rotating.

[0040] See Figure 1The main body 2 of the platform includes a fixed frame 21 and a fixed platform 22. The cross-section of the plane on the parallel ramp 1 on the fixed frame 21 is U-shaped. One end face of the fixed frame 21 is connected to the end face on the ramp 1. The fixed platform 22 is located in the middle of the U-shaped structure in the fixed frame 21. A sliding groove 211 runs through the side wall of the fixed frame 21. The sliding groove 211 is horizontally set. A braking speed measuring mechanism 3 is installed inside the sliding groove 211 and can slide horizontally within the sliding groove 211.

[0041] The fixed platform 22 has an internal mounting cavity, and a mounting groove 222 is provided on the upper end face of the fixed platform 22. Limiting grooves 221 are symmetrically provided on the left and right sides of the mounting groove 222. A lifting plate 4 is installed in the mounting groove 222, and a limiting mechanism 6 is installed in the limiting groove 221. The top of the limiting mechanism 6 extends 5-8 cm beyond the top plane of the fixed platform 22. After the driver drives the car above the fixed platform 22, the limiting groove 221 marks the car's parking position, thus providing the driver with a positioning standard for parking the car on the fixed platform 22, facilitating the driver to complete the car's positioning on the fixed platform 22 in one go. The limiting mechanism 6 also provides a clear positioning standard for the car. The top of the limiting mechanism 6 installed in the groove 221 is 5-8cm higher than the top plane of the fixed platform 22. After the driver drives the car into the limiting mechanism 6, a positioning component will be formed. When the driver encounters deceleration resistance for the first time during the movement of the car, it means that the wheels of the car have passed the limiting mechanism 6 near the ramp 1 in the direction of travel. When the driver encounters deceleration resistance for the second time during the movement of the car, it means that the front and rear wheels of the car have moved into the limiting mechanisms 6 on the front and rear sides of the lifting plate 4. This positioning method further enhances the positioning of the car wheels by the platform body 2, making it easier for the driver to position the car on the fixed platform 22.

[0042] See Figures 1-3 The bottom of the lifting plate 4 is rectangular and has four lifting mechanisms 7. Each limiting mechanism 6 has two lifting mechanisms 7 symmetrically arranged at its bottom. When the lifting mechanism 7 is driven by the driving component, both the lifting plate 4 and the limiting mechanism 6 perform lifting operations. The lifting mechanism 7 and the driving component are installed in the mounting cavity provided on the fixed platform 22.

[0043] See Figures 2-4 The limiting mechanism 6 includes a connecting rod 62, which is horizontally installed in the mounting cavity. The bottom end face of the connecting rod 62 is connected to the top of two lifting mechanisms 7. The two ends of the connecting rod 62 are respectively provided with mounting plates. On the upper end face of each mounting plate, at the position of its two ends, a limiting block 61 is vertically provided. The distance between two limiting blocks 61 on the same mounting plate is greater than the diameter of the tire. The limiting block 61 is installed in the limiting groove 221, and the top of the limiting block 61 extends out of the limiting groove 221 and is 5~8cm higher than the upper end face of the fixed platform 22.

[0044] Preferably, in the limiting mechanism 6 near the ramp 1, a first movable sleeve is fitted on the limiting block 61 away from the lifting plate 4, and a first return spring is provided between the inner end face of the first movable sleeve and the top end face of the limiting block 61. In the limiting mechanism 6 away from the ramp 1, a second movable sleeve is fitted on the limiting block 61 near the lifting plate 4, and a second return spring is provided between the inner end face of the second movable sleeve and the top end face of the limiting block 61. When the driver drives the car wheel through the limiting mechanism 6, the wheel will press the first movable sleeve or the second movable sleeve to reduce the deceleration resistance of the car movement. After the car wheel passes, the movable sleeve is restored to its initial position by the return spring.

[0045] See Figure 2 and Figure 3 The lifting mechanism 7 includes a rotating cylinder 71, with a driving component connected to the bottom of the rotating cylinder 71. The driving component is installed on the bottom end face of the mounting cavity on the fixed platform 22. A threaded hole is provided on the upper end of the rotating cylinder 71, and a lead screw 72 is screwed into the threaded hole. The top of the lead screw 72 in the lifting mechanism 7 located below the limiting mechanism 6 is connected to the bottom end face of the connecting rod 62, and the top of the lead screw 72 in the lifting mechanism 7 located below the lifting plate 4 is connected to the bottom end face of the lifting plate 4.

[0046] See Figure 2 and Figure 3 The driving components include a drive motor 5, an active conveying mechanism 8, a meshing mechanism 9, and an inclined conveying mechanism 10. The drive motor 5 is installed in the mounting cavity provided on the fixed platform 22. The drive motor 5 is connected to the active conveying mechanism 8, which is connected to the meshing mechanism 9. The meshing mechanism 9 is connected to the inclined conveying mechanism 10. The active conveying mechanism 8 is connected to the rotating cylinder 71 in the lifting mechanism 7 located below the lifting plate 4. The inclined conveying mechanism 10 is connected to the rotating cylinder 71 in the lifting mechanism 7 located below the limiting mechanism. The active conveying mechanism 8 is used to drive the lifting mechanism 7 below the lifting plate 4. The outer side of the active conveying mechanism 8 is connected to the inclined conveying mechanism 10 through the meshing mechanism 9. The inclined conveying mechanism 10 is used to drive the lifting mechanism 7 at the bottom of the limiting mechanism 6. Starting the drive motor 5 will drive the active conveying mechanism 8 to work, thereby starting the lifting mechanism 7 at the bottom of the lifting plate 4. Since the outer side of the active conveying mechanism 8 is connected to the inclined conveying mechanism 10 through the meshing mechanism 9, the inclined conveying mechanism 10 drives the lifting mechanism 7 at the bottom of the limiting mechanism 6 to start lifting operations.

[0047] See Figure 2 and Figure 3The active transmission mechanism 8 includes an active disk 81, which is mounted on the output shaft of the drive motor 5. The active disk 81 is connected to a driven disk 83 via a transverse transmission belt 82. A first drive disk 85 is connected to the driven disk 83 via a longitudinal transmission belt 84. The upper end of the first drive disk 85 is connected to the lower end of the rotating cylinder 71 in the lifting mechanism 7 installed at the bottom of the lifting plate 4. The driven disk 83 is rotated by the active disk 81, and the first drive disk 85 is driven to rotate by the active disk 81 via the longitudinal transmission belt 84. Since the top of the lead screw 72 in the lifting mechanism 7 installed at the bottom of the lifting plate 4 is connected to the lifting plate 4, when the first drive disk 85 drives the rotating cylinder 71 to rotate, the lead screw 72 moves up and down under the threaded engagement with the rotating cylinder 71, thereby enabling the lifting plate 4 to move up and down.

[0048] The meshing mechanism 9 includes a driving gear 91 and a driven gear 92. The top of the driving gear 91 is coaxially connected to the driven disk 83. The driven gear 92 is mounted on the side of the driving gear 91 and meshes with it. The inclined conveying mechanism 10 is connected to the driven gear 92, and power is transmitted to the inclined conveying mechanism 10 through the driven gear 92 and the driving gear 91.

[0049] The inclined conveying mechanism 10 includes a rotating disk 101, which is coaxially mounted on the top of the driven gear 92. The rotating disk 101 is connected to a second drive disk 102 via an inclined transmission belt 103. The top of the second drive disk 102 is coaxially connected to the lower end of the rotating cylinder 71 in the lifting mechanism 7 installed at the bottom of the limiting mechanism 6. Since the second drive disk 102 and the first drive disk 85 are powered by the same drive motor 5, the rotation directions of the second drive disk 102 and the first drive disk 85 are opposite. That is, in this test bench, when the lifting mechanism 7 installed at the bottom of the lifting plate 4 drives the lifting plate 4 to rise, the lifting mechanism 7 installed at the bottom of the limiting mechanism 6 drives the limiting mechanism 6 to fall, so as to prevent the limiting mechanism 6 from affecting the rotation of the car wheel during the rotation process.

[0050] See Figure 1 Anti-slip strips are provided on the inclined surface of the ramp 1. The anti-slip strips increase the friction between the car wheels and the inclined surface of the ramp 1, preventing the car wheels from slipping on the inclined surface of the ramp 1 and ensuring that the car smoothly drives into the main body 2 of the platform.

[0051] The braking speed measuring mechanism 3 includes a sliding seat, which is installed in a slide groove 211. A centering rotation mechanism is rotatably connected to the end face of the sliding seat relative to the inner side of the main body 2. The centering rotation mechanism includes a rotating disk, which is rotatably connected to a central gear. A first rack groove is provided on the outer side of the central gear. Three first rack grooves are evenly provided along the circumference of the rotating disk. A second rack groove is provided above the first rack groove. A first tooth block is slidably connected in the first rack groove. A second tooth block is slidably connected in the second rack groove. Straight racks are evenly fixedly connected to the side of the first tooth block and mesh with the central gear. Helical racks are fixedly connected to the upper end of the first tooth block and mesh with each other. A second threaded rod is threadedly connected inside one of the first tooth blocks. The two ends of the second threaded rod are rotatably connected to the rotating disk. A rotating rod is fixedly connected to the side of the second tooth block near the main body 2. A sleeve is fixedly connected to the other end of the rotating rod. A sensing medium is wrapped around one of the rotating rods. A sensing counter is fixedly connected to the upper surface of the main body 2.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of this utility model and should not be used to limit the scope of protection of this utility model. Any modifications made to the technical solutions based on the technical concept proposed by this utility model shall fall within the scope of protection of the claims of this utility model.

Claims

1. A test bench for vehicle speed, characterized in that, The rack body (2) is provided with a lifting plate (4) connected to one end of a lifting mechanism (7) installed in the rack body (2), and a driving member connected to the other end of the lifting mechanism (7). The rack body (2) is provided with a limiting groove (221) for automobile wheel positioning on both sides of the lifting plate (4) in the rack body (2). The rack body (2) is provided with a brake speed measuring mechanism (3) corresponding to the position of the limiting groove (221).

2. The automotive speed test bench of claim 1, wherein, The rack body (2) comprises a fixed frame (21) provided with a fixed table (22) installed therein, and the fixed table (22) is provided with a mounting cavity, and the lifting mechanism (7) and the driving member are installed in the mounting cavity. The top of the fixed table (22) is provided with a mounting groove (222) in communication with the mounting cavity, and the lifting plate (4) is installed in the mounting groove (222). The mounting cavity is provided with a limiting mechanism (6) at both ends of the lifting plate (4), and one end of the limiting mechanism (6) is installed in the limiting groove, and the bottom of the limiting mechanism (6) is also connected to the lifting mechanism (7).

3. The automotive speed test bench of claim 2, wherein, The limiting mechanism (6) comprises a connecting rod (62) connected to the top of the lifting mechanism (7), and the connecting rod (62) is connected to a mounting plate, and the mounting plate is provided with two limiting blocks (61) installed therein, and the limiting blocks (61) are installed in the limiting groove (221), and the top of the limiting blocks (61) extends out of the limiting groove (221), and the top of the limiting blocks (61) is 5-8 cm higher than the top of the fixed table (22).

4. The automotive speed test bench of claim 3, wherein, The lifting mechanism (7) comprises a rotating cylinder (71) connected to the driving member. The top of the rotating cylinder (71) is provided with a threaded hole, and a lead screw (72) is rotatably arranged in the threaded hole, and the top of the lead screw (72) located at the bottom of the limiting mechanism (6) is connected to the connecting rod (62), and the top of the lead screw (72) located at the bottom of the lifting plate (4) is connected to the bottom of the lifting plate (4).

5. The automotive speed test bench of claim 4, wherein, The driving member comprises a driving motor (5) connected to a driving transmission mechanism (8), and the driving transmission mechanism (8) is connected to the rotating cylinder (71) located at the bottom of the lifting plate (4); the driving transmission mechanism (8) is connected to an inclined conveying mechanism (10) through a meshing mechanism (9), and the inclined conveying mechanism (10) is connected to the rotating cylinder (71) located at the bottom of the limiting mechanism (6).

6. The automotive speed test bench of claim 5, wherein, The driving transmission mechanism (8) comprises a driving disc (81) installed on the output shaft of the driving motor (5), and the driving disc (81) is connected to a driven disc (83) through a transverse transmission belt (82), and the driven disc (83) is connected to a first driving disc (85) through a longitudinal transmission belt (84), and the first driving disc (85) is connected to the rotating cylinder (71) located at the bottom of the lifting plate (4). The engaging mechanism (9) is coaxially connected to the driven disc (83).

7. The automotive speed test bench of claim 6, wherein, The engaging mechanism (9) comprises a driving gear (91) and a driven gear (92), the driving gear (91) is coaxially connected to the driven disc (83), the driven gear (92) is installed on the side of the driving gear (91), the driving gear (91) and the driven gear (92) are engaged with each other, and the driven gear (92) is coaxially connected to the inclined conveying mechanism (10).

8. The automotive speed test bench of claim 7, wherein, The inclined conveying mechanism (10) comprises a rotating disc (101), the rotating disc (101) is coaxially installed at the top end of the driven gear (92), the rotating disc (101) is connected with a second driving disc (102) through an inclined transmission belt (103), the top end of the second driving disc (102) is coaxially connected with the rotating cylinder (71) at the bottom of the limiting mechanism (6), and the rotating direction of the second driving disc (102) is opposite to that of the first driving disc (85).

9. The automotive speed test bench of claim 2, wherein, One side end surface of the fixed frame (21) is connected with a slope table (1), and the slope bottom of the slope table (1) is flush with the top of the fixed table (22).

10. The automotive speed test bench of claim 9, wherein, The slope surface of the slope table (1) is provided with an anti-skid belt.

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