Calibrating device for automobile axle load instrument

Abstract

The utility model relates to the technical field of axle load instrument calibration, in particular to an automobile axle load instrument calibration device which comprises a bottom plate, a lifting driving mechanism, a pressure sensor, a stress block and a connecting structure, the lifting driving mechanism is arranged on the bottom plate, one end of the pressure sensor is connected with the power output end of the lifting driving mechanism, and the other end of the pressure sensor is connected with the stress block. The other end is connected with the stress block; and the connecting structure is connected with the stress block. The axle load meter calibration device overcomes the defects that in the prior art, in the process of calibrating an axle load meter, a standard calibration block needs to be carried manually, and manpower is consumed, the axle load meter calibration device is provided with the lifting driving mechanism, the pressure sensor and the stress block, and the pressure sensor and the stress block are driven by the lifting driving mechanism to extrude each other; the extrusion force of the stress block to the pressure sensor can be transmitted to the axle load instrument through the lifting driving mechanism and the bottom plate so as to apply pressure to the axle load instrument, the standard calibration block does not need to be manually carried to apply pressure to the axle load instrument, and manpower can be saved.

Description

Technical Field

[0001] The utility model relates to the technical field of axle load meter calibration, and more specifically, to a vehicle axle load meter calibration device. Background Art

[0002] The vehicle axle load meter is a device used to measure the vehicle axle weight. It usually consists of a sensor, a data acquisition unit and a display. The axle load meter is generally integrated into the vehicle's four-wheel alignment device. When measuring the weight, the vehicle is driven until the tires are pressed on the axle load meter. At the same time, the positioning structure on the vehicle's four-wheel alignment device positions the vehicle tires. The axle load meter's sensor can measure the vehicle's axle weight and transmit the data to the data acquisition unit, and then the display will show the data.

[0003] The axle load meter needs to be calibrated before use to ensure the accuracy and reliability of its measurement results. The purpose of calibration is to make the output measurement results as close to the actual value as possible by adjusting the internal parameters of the instrument or comparing it with a standard sample.

[0004] At present, the calibration method of automobile axle load meter is to stack standard calibration blocks of known weight on the axle load meter in sequence and record the corresponding measured values. Then the measured results are compared with the actual total weight of the standard calibration blocks, and the parameters of the axle load meter are adjusted according to the deviation so that the measured value output by it is consistent with the weight of the standard calibration blocks.

[0005] However, in the above technical solution, the standard calibration block needs to be carried manually, which is very labor-intensive. Moreover, due to the certain bearing surface area of ​​the axle load meter and the volume of the standard calibration block, the total weight of the standard calibration blocks that can be stacked is between 300kg and 400kg. However, in fact, the axle weight of a single wheel of a car is between several hundred kg and one thousand kg. First of all, the total weight of the calibration block is much lower than the axle weight required to be measured in actual applications, which may lead to inaccurate calibration results. Because the calibration process requires the use of loads similar to those in actual applications to ensure the accuracy of the measuring equipment under various load conditions. Secondly, due to the low total weight of the calibration block, it may not cover all load ranges in actual applications, resulting in insufficient or inaccurate calibration under high load conditions. Utility Model Content

[0006] In view of the problem that the process of calibrating an axle load meter in the above-mentioned prior art requires manual transportation of standard calibration blocks, which is relatively labor-intensive, the utility model provides a calibration device for an automobile axle load meter, which does not require manual transportation of standard calibration blocks and can save manpower.

[0007] In order to solve the above technical problems, the technical solution provided by the utility model is:

[0008] A vehicle axle load meter calibration device comprises a base plate, a lifting drive mechanism, a pressure sensor, a force block and a connecting structure. The lifting drive mechanism is arranged on the base plate, one end of the pressure sensor is connected to the power output end of the lifting drive mechanism, and the other end is connected to the force block; the connecting structure is connected to the force block, and the connecting structure is also used to connect to the vehicle four-wheel alignment device.

[0009] In the prior art, the axle load meter is arranged on the four-wheel alignment device of the automobile. In the above technical scheme, the base plate is first placed directly above the axle load meter, and then the connecting structure is connected to the four-wheel alignment device of the automobile, so that the connecting structure and the four-wheel alignment device of the automobile remain relatively fixed. Then the lifting drive mechanism outputs power to drive the pressure sensor to squeeze the force-bearing block. Since the pressure between the force-bearing block and the pressure sensor is mutual, the pressure of the force-bearing block on the pressure sensor will be transmitted to the base plate through the lifting drive mechanism, and then applied to the axle load meter through the base plate. It can be understood that the pressure on the axle load meter is equal to the pressure on the pressure sensor. Compare the pressure value measured by the axle load meter with the pressure value measured by the pressure sensor. If there is a deviation, the staff will calibrate the axle load meter again until the pressure value output by the axle load meter is consistent with the pressure value measured by the pressure sensor, and the calibration of the axle load meter can be completed.

[0010] The connection structure and the existing four-wheel alignment device for automobiles may be connected by snap connection, thread connection, bonding, or connection through connecting parts such as binding straps.

[0011] Preferably, the connection structure includes a first screw and a second screw parallel to each other, the first screw and the second screw are respectively rotatably connected to the force block, the first screw is used to be threadedly connected to one of the threaded holes on the metal cover of the automobile four-wheel alignment device, and the second screw is used to be threadedly connected to another threaded hole on the metal cover of the automobile four-wheel alignment device; the pressure sensor is located between the first screw and the second screw. Two threaded holes are opened on the metal cover of the automobile four-wheel alignment device in the prior art, and then the first screw is threadedly connected to one of the threaded holes, and then the second screw is threadedly connected to the other threaded hole, so that the first screw and the second screw are fixed on the metal cover of the automobile four-wheel alignment device, so that the force block and the automobile four-wheel alignment device remain relatively fixed. The structure of the first screw and the second screw is relatively simple, and the installation and removal of the two on the metal cover of the automobile four-wheel alignment device are relatively simple and quick, which is conducive to improving the calibration efficiency of the axle load meter.

[0012] Preferably, a first fastening nut is threadedly connected to the first screw rod, and the first fastening nut is used to abut against the metal cover plate of the four-wheel alignment device of the automobile; a second fastening nut is threadedly connected to the second screw rod, and the second fastening nut is used to abut against the metal cover plate of the four-wheel alignment device of the automobile. The first fastening nut can be used to fasten the first screw rod to the metal cover plate of the four-wheel alignment device of the automobile, so that the first screw rod is more firmly fixed on the metal cover plate of the four-wheel alignment device of the automobile. The function of the second fastening nut is similar to that of the first fastening nut, so it will not be repeated.

[0013] Preferably, the force-bearing block is provided with a guide through cavity, and the guide through cavity extends from one side of the force-bearing block to the other side along the vertical connection direction of the first screw and the second screw; the first screw and the second screw both pass through the guide through cavity, the first screw is threadedly connected with a first limit nut, and the second screw is threadedly connected with a second limit nut, and the first limit nut and the second limit nut are both used to abut against the top of the force-bearing block. Since the sizes and tire spacings of different models of automobile tires are different, the sizes of the automobile four-wheel alignment devices used are different, and the horizontal lengths and widths of the axle load meters used are different, so that the spacing of the metal cover plates on both sides of the axle load meter is also different, so the spacing of the two threaded holes on the metal cover plates of different automobile four-wheel alignment devices is different. After the guide through cavity is set, the first screw and the second screw can be close to or away from each other along the guide through cavity, so as to adapt to the positions of the threaded holes with different spacings. After determining the positions of the first screw and the second screw, the first screw and the second screw are fixed on the metal cover plate of the automobile four-wheel alignment device, and the first limiting nut and the second limiting nut are screwed so that both are in contact with the top end of the force-bearing block at the same time, and the upward movement of the force-bearing block is limited by the first limiting nut and the second limiting nut.

[0014] Preferably, at least two of the first limiting nuts are provided and distributed above the force-bearing block along the axial direction of the first screw, and one of the first limiting nuts is used to abut against the top of the force-bearing block; at least two of the second limiting nuts are provided and distributed above the force-bearing block along the axial direction of the second screw, and one of the second limiting nuts is used to abut against the top of the force-bearing block. It can be understood that the provision of at least two first / second limiting nuts has a better limiting effect than a single first / second limiting nut, which can reduce the risk of the first / second limiting nut deviating upward, thereby improving the stability of the force-bearing block.

[0015] The lifting drive mechanism may be a motor screw drive mechanism, an electric push rod drive mechanism, a cylinder drive mechanism, a hydraulic cylinder drive mechanism, a gear rack drive mechanism or a synchronous belt drive mechanism.

[0016] Preferably, the lifting drive mechanism includes a hydraulic jack, the main body of the hydraulic jack is connected to the base plate, and the piston rod of the hydraulic jack is connected to the pressure sensor. The structure of the hydraulic jack is relatively simple, and it can provide a higher load-bearing capacity. The hydraulic jack extends its piston rod to drive the pressure sensor to squeeze the force block. The mutual squeezing force between the pressure sensor and the force block can be as high as 10000N, which is approximately equal to the gravity of a car weighing 1000kg. Therefore, using a hydraulic jack to lift the pressure sensor can give the axle load meter a larger calibration load range, which is conducive to improving the accuracy of the axle load meter calibration.

[0017] The connection relationship between the pressure sensor and the hydraulic jack and the force block can be abutment or fixed connection. Preferably, the bottom end of the pressure sensor abuts the piston of the hydraulic jack, and the top end of the pressure sensor abuts the force block, so that it is convenient to regularly remove the pressure sensor from between the force block and the piston of the hydraulic jack for calibration or maintenance and replacement.

[0018] Preferably, an abutment plate is provided at the middle of the bottom end of the force-bearing block, and the pressure sensor abuts against the abutment plate. Providing the abutment plate facilitates the positioning of the pressure sensor at the bottom of the force-bearing block, and the abutment of the pressure sensor against the abutment plate can make the force of the force-bearing block more balanced and maintain a horizontal state, thereby avoiding the tilt of the force-bearing block, which causes the measurement result of the pressure sensor to be inconsistent with its actual force.

[0019] Preferably, a connecting plate is provided at the middle of the top of the stress-bearing block, and the two sides of the stress-bearing block located on both sides of the guide cavity are connected by the connecting plate. Providing the connecting plate can improve the strength of the stress-bearing block and prevent the guide cavity from being expanded and causing the stress-bearing block to split.

[0020] Preferably, the top surface of the force-bearing block is provided with scale lines, and the scale lines are linearly distributed along the extension direction of the guide cavity. Setting the scale lines can more intuitively understand the spacing between the first screw and the second screw, ensuring that the first screw and the second screw are at the same spacing from the pressure sensor in the horizontal direction, so that the force of the force-bearing block is more balanced.

[0021] The beneficial effects of the utility model are as follows: a lifting drive mechanism, a pressure sensor and a force block are arranged, and the pressure sensor and the force block are driven by the lifting drive mechanism to squeeze each other, and the squeezing force of the force block on the pressure sensor can be transmitted to the axle weight meter through the lifting drive mechanism and the base plate, so as to apply pressure to the axle weight meter, and there is no need to manually carry the standard calibration block to apply pressure to the axle weight meter, which can save manpower; a first screw and a second screw are arranged for connection with the metal cover plate of the existing automobile four-wheel alignment device, and the connection method is simple, and the spacing between the first screw and the second screw is adjustable, which can adapt to the threaded hole position of the metal cover plate of different automobile four-wheel alignment devices; a hydraulic jack is used to drive the pressure sensor to squeeze the force block, and the squeezing force can be as high as 1000kg, so that the axle weight meter has a larger calibration load range, which is beneficial to improving the accuracy of the axle weight meter calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The diagram is a schematic diagram of one of the viewing angles of a vehicle axle load meter calibration device;

[0023] Figure 2 is a schematic diagram of a vehicle axle load meter calibration device from another perspective;

[0024] Figure 3 It is a schematic diagram of the relative positions of a metal cover plate and an axle load meter of a four-wheel alignment device for an automobile in the prior art;

[0025] Figure 4 Schematic diagram of the distribution of scale lines in Example 3.

[0026] In the attached drawings: 1-base plate; 2-lifting drive mechanism; 3-pressure sensor; 4-force block; 401-guide cavity; 402-abutment plate; 403-connecting plate; 5-first screw; 6-second screw; 7-first fastening nut; 8-second fastening nut; 9-first limiting nut; 10-second limiting nut; 11-scale line; 12-metal cover plate; 13-axle weight meter. DETAILED DESCRIPTION

[0027] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0028] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0030] Example 1

[0031] Combination Figure 1 and Figure 2 The illustrated embodiment shows a vehicle axle load meter calibration device, which comprises a base plate 1, a lifting drive mechanism 2, a pressure sensor 2, a force block 4 and a connecting structure. The lifting drive mechanism 2 is arranged on the base plate 1, one end of the pressure sensor 2 is connected to the power output end of the lifting drive mechanism 2, and the other end is connected to the force block 4; the connecting structure is connected to the force block 4, and the connecting structure is also used to connect to the vehicle four-wheel alignment device.

[0032] Furthermore, the connection structure includes a first screw rod 5 and a second screw rod 6 which are parallel to each other. The first screw rod 5 and the second screw rod 6 are respectively rotatably connected to the force block 4. The first screw rod 5 is used to be threadedly connected to one of the threaded holes on the metal cover plate of the automobile four-wheel alignment device, and the second screw rod 6 is used to be threadedly connected to another threaded hole on the metal cover plate of the automobile four-wheel alignment device; the pressure sensor 2 is located between the first screw rod 5 and the second screw rod 6. Two threaded holes are opened on the metal cover plate of the automobile four-wheel alignment device in the prior art, and then the first screw rod 5 is threadedly connected to one of the threaded holes, and then the second screw rod 6 is threadedly connected to the other threaded hole, so that the first screw rod 5 and the second screw rod 6 are fixed on the metal cover plate of the automobile four-wheel alignment device, so that the force block 4 and the automobile four-wheel alignment device remain relatively fixed. The structure of the first screw rod 5 and the second screw rod 6 is relatively simple, and the installation and removal of the two on the metal cover plate of the automobile four-wheel alignment device are relatively simple and quick, which is conducive to improving the calibration efficiency of the axle load meter.

[0033] Furthermore, a first fastening nut 7 is threadedly connected to the first screw rod 5, and the first fastening nut 7 is used to abut against the metal cover plate of the four-wheel alignment device of the automobile; a second fastening nut 8 is threadedly connected to the second screw rod 6, and the second fastening nut 8 is used to abut against the metal cover plate of the four-wheel alignment device of the automobile. The first fastening nut 7 can be used to fasten the first screw rod 5 to the metal cover plate of the four-wheel alignment device of the automobile, so that the first screw rod 5 is more firmly fixed on the metal cover plate of the four-wheel alignment device of the automobile. The function of the second fastening nut 8 is similar to that of the first fastening nut 7, so it is not repeated.

[0034] Furthermore, the force block 4 is provided with a guide through cavity 401, which extends from one side of the force block 4 to the other side along the vertical connection direction of the first screw 5 and the second screw 6; the first screw 5 and the second screw 6 both pass through the guide through cavity 401, the first screw 5 is threadedly connected with a first limit nut 9, and the second screw 6 is threadedly connected with a second limit nut 10, and the first limit nut 9 and the second limit nut 10 are both used to abut against the top of the force block 4. Due to the different sizes and tire spacings of different models of automobile tires, the sizes of the automobile four-wheel alignment devices used are different, and the horizontal lengths and widths of the axle load meters used are different, so that the spacing of the metal cover plates on both sides of the axle load meters is also different, so the spacing of the two threaded holes on the metal cover plates of different automobile four-wheel alignment devices is different. After the guide through cavity 401 is set, the first screw 5 and the second screw 6 can be close to or away from each other along the guide through cavity 401, so as to adapt to the positions of the threaded holes with different spacings. After determining the positions of the first screw 5 and the second screw 6, the first screw 5 and the second screw 6 are fixed on the metal cover plate of the automobile four-wheel alignment device, and the first limiting nut 9 and the second limiting nut 10 are screwed so that both of them abut against the top end of the force-bearing block 4 at the same time, and the first limiting nut 9 and the second limiting nut 10 are used to limit the upward movement of the force-bearing block 4.

[0035] Specifically, three first limiting nuts 9 are provided and distributed above the force block 4 along the axial direction of the first screw rod 5, and one of the first limiting nuts 9 is used to abut against the top of the force block 4; three second limiting nuts 10 are provided and distributed above the force block 4 along the axial direction of the second screw rod 6, and one of the second limiting nuts 10 is used to abut against the top of the force block 4. It can be understood that the three first / second limiting nuts have a better limiting effect than the single first / second limiting nut, which can reduce the risk of the first / second limiting nut deviating upward, thereby improving the stability of the force block 4.

[0036] The working principle or workflow of this embodiment is as follows: Figure 3The figure shows the relative positions of the metal cover plate 12 and the axle load meter 13 of the prior art vehicle four-wheel alignment device. The axle load meter 13 is arranged on the vehicle four-wheel alignment device, and the axle load meter 13 is located between two metal cover plates 12 of the vehicle four-wheel alignment device. Each of the two metal cover plates 12 is provided with a threaded hole (not shown in the figure). Figures 1 to 3 As shown, during implementation, the base plate 1 is first placed directly above the axle load meter 13, and then the first screw 5 and the second screw 6 are respectively screwed into the two threaded holes of the metal cover plate 12 of the automobile four-wheel alignment device, and then the first fastening nut 7 and the second fastening nut 8 are used to fasten the first screw 5 and the second screw 6 to the metal cover plate 12 of the automobile four-wheel alignment device, so that the first screw 5 and the second screw 6 are relatively fixed to the automobile four-wheel alignment device. Then the lifting drive mechanism 2 outputs power to drive the pressure sensor 2 to squeeze the force block 4. Since the pressure between the force block 4 and the pressure sensor 2 is mutual, the pressure of the force block 4 on the pressure sensor 2 will be transmitted to the base plate 1 through the lifting drive mechanism 2, and then applied to the axle load meter 13 through the base plate 1. It can be understood that the pressure on the axle load meter 13 is equal to the pressure on the pressure sensor 2. The pressure value measured by the axle load meter 13 is compared with the pressure value measured by the pressure sensor 2. If there is a deviation, the staff will calibrate the axle load meter 13 again until the pressure value output by the axle load meter 13 is consistent with the pressure value measured by the pressure sensor 2. The calibration of the axle load meter 13 is completed.

[0037] The beneficial effects of this embodiment are as follows: a lifting drive mechanism, a pressure sensor and a force block are provided, and the lifting drive mechanism is used to drive the pressure sensor and the force block to squeeze each other. The squeezing force of the force block on the pressure sensor can be transmitted to the axle weight meter through the lifting drive mechanism and the base plate, thereby applying pressure to the axle weight meter. There is no need to manually carry the standard calibration block to apply pressure to the axle weight meter, which can save manpower; a first screw and a second screw are provided for connecting to the metal cover plate of an existing automobile four-wheel alignment device. The connection method is simple, and the spacing between the first screw and the second screw is adjustable, which can adapt to the threaded hole positions of the metal cover plates of different automobile four-wheel alignment devices.

[0038] Example 2

[0039] This embodiment is based on embodiment 1. Figure 1As shown, the lifting drive mechanism 2 includes a hydraulic jack, the main body of the hydraulic jack is connected to the bottom plate 1, and the piston rod of the hydraulic jack is connected to the pressure sensor 2. The structure of the hydraulic jack is relatively simple, and it can provide a higher load-bearing capacity. The hydraulic jack extends its piston rod to drive the pressure sensor 2 to squeeze the force block 4. The mutual squeezing force between the pressure sensor 2 and the force block 4 can be as high as 10000N, which is approximately equal to the gravity of a car weighing 1000kg. Therefore, using a hydraulic jack to lift the pressure sensor 2 can make the axle load meter have a larger calibration load range, which is conducive to improving the accuracy of the axle load meter calibration.

[0040] Specifically, the bottom end of the pressure sensor 2 abuts against the piston of the hydraulic jack, and the top end of the pressure sensor 2 abuts against the force block 4, so that it is convenient to regularly remove the pressure sensor 2 from between the force block 4 and the piston of the hydraulic jack for calibration or maintenance and replacement.

[0041] Furthermore, an abutment plate 402 is provided at the middle of the bottom end of the force-bearing block 4, and the pressure sensor 2 abuts against the abutment plate 402. The abutment plate 402 is provided to facilitate the positioning of the pressure sensor 2 at the bottom of the force-bearing block 4. The abutment of the pressure sensor 2 against the abutment plate 402 can make the force of the force-bearing block 4 more balanced and maintain a horizontal state, thereby avoiding the tilt of the force-bearing block 4, which causes the measurement result of the pressure sensor 2 to be inconsistent with its actual force.

[0042] Furthermore, if Figure 1 and Figure 2 As shown, three connecting plates 403 are provided at the top of the force-bearing block 4, one of which is located in the middle of the top of the force-bearing block 4, and the other two connecting plates 403 are respectively located on both sides of the top of the force-bearing block 4, and the two sides of the guide cavity 401 where the force-bearing block 4 is located are connected by the connecting plates 403. Providing the connecting plates 403 can improve the strength of the force-bearing block 4 and prevent the guide cavity 401 from being expanded and causing the force-bearing block 4 to split.

[0043] The other features, working principles and beneficial effects of this embodiment are consistent with those of Embodiment 1.

[0044] Example 3

[0045] This embodiment is based on embodiment 2. Figure 4 As shown, the top surface of the force block 4 is provided with scale lines 11, and the scale lines 11 are linearly distributed along the extension direction of the guide through cavity 401. The scale lines 11 can be set to more intuitively understand the spacing between the first screw 5 and the second screw 6, ensuring that the first screw 5 and the second screw 6 are at the same spacing from the pressure sensor 2 in the horizontal direction, so that the force of the force block 4 is more balanced.

[0046] The other features, working principles and beneficial effects of this embodiment are consistent with those of Embodiment 2.

[0047] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description, and it is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A vehicle axle load meter calibration device, characterized in that: The invention comprises a base plate (1), a lifting drive mechanism (2), a pressure sensor (3), a force block (4) and a connecting structure, wherein the lifting drive mechanism (2) is arranged on the base plate (1), one end of the pressure sensor (3) is connected to the power output end of the lifting drive mechanism (2), and the other end is connected to the force block (4); the connecting structure is connected to the force block (4), and the connecting structure is also used to connect to a four-wheel alignment device for an automobile.

2. The vehicle axle load meter calibration device according to claim 1, characterized in that: The connection structure comprises a first screw rod (5) and a second screw rod (6) which are parallel to each other. The first screw rod (5) and the second screw rod (6) are respectively rotatably connected to the force bearing block (4). The first screw rod (5) is used for being threadedly connected to one of the threaded holes on the metal cover plate of the automobile four-wheel alignment device, and the second screw rod (6) is used for being threadedly connected to another threaded hole on the metal cover plate of the automobile four-wheel alignment device. The pressure sensor (3) is located between the first screw rod (5) and the second screw rod (6).

3. The vehicle axle load meter calibration device according to claim 2, characterized in that: The first screw rod (5) is threadedly connected with a first fastening nut (7), and the first fastening nut (7) is used to abut against a metal cover plate of a four-wheel alignment device for an automobile; the second screw rod (6) is threadedly connected with a second fastening nut (8), and the second fastening nut (8) is used to abut against a metal cover plate of a four-wheel alignment device for an automobile.

4. The vehicle axle load meter calibration device according to claim 2, characterized in that: The force-bearing block (4) is provided with a guide cavity (401), and the guide cavity (401) extends from one side of the force-bearing block (4) to the other side along the vertical connection direction of the first screw rod (5) and the second screw rod (6); the first screw rod (5) and the second screw rod (6) both pass through the guide cavity (401), the first screw rod (5) is threadedly connected with a first limiting nut (9), and the second screw rod (6) is threadedly connected with a second limiting nut (10), and the first limiting nut (9) and the second limiting nut (10) are both used to abut against the top end of the force-bearing block (4).

5. The vehicle axle load meter calibration device according to claim 4, characterized in that: At least two of the first limiting nuts (9) are provided and are distributed above the force-bearing block (4) along the axial direction of the first screw rod (5), and one of the first limiting nuts (9) is used to abut against the top end of the force-bearing block (4); at least two of the second limiting nuts (10) are provided and are distributed above the force-bearing block (4) along the axial direction of the second screw rod (6), and one of the second limiting nuts (10) is used to abut against the top end of the force-bearing block (4).

6. The vehicle axle load meter calibration device according to claim 4, characterized in that: The lifting drive mechanism (2) comprises a hydraulic jack, the main body of the hydraulic jack is connected to the base plate (1), and the piston of the hydraulic jack is connected to the pressure sensor (3).

7. The vehicle axle load meter calibration device according to claim 6, characterized in that: The bottom end of the pressure sensor (3) abuts against the piston of the hydraulic jack, and the top end of the pressure sensor (3) abuts against the force-bearing block (4).

8. The vehicle axle load meter calibration device according to claim 6, characterized in that: A contact plate (402) is provided in the middle of the bottom end of the force-bearing block (4), and the pressure sensor (3) contacts the contact plate (402).

9. The vehicle axle load meter calibration device according to claim 8, characterized in that: A connecting plate (403) is provided at the middle of the top end of the force-bearing block (4), and the two sides of the force-bearing block (4) located on both sides of the guide cavity (401) are connected via the connecting plate (403).

10. A vehicle axle load meter calibration device according to any one of claims 4 to 9, characterized in that: The top surface of the force-bearing block (4) is provided with scale lines (11), and the scale lines (11) are linearly distributed along the extension direction of the guide cavity (401).

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