CN111692974A - Indirect measurement method for measuring dimension of hard spot of chassis of accident vehicle - Google Patents

Abstract

The invention discloses an indirect measurement method for measuring the size of hard points on the chassis of an accident vehicle. The special equipment includes two laser levels and an auxiliary level. A main laser transmitting tube and a laser receiving tube are installed horizontally on the sides of the level and the auxiliary level. The control line of the laser emitting tube is linked to the signal output end of the microcontroller. When using special equipment to measure hard points on the body chassis, the traditional direct measurement method is changed to classified measurement. When there is no obstruction below the measured point, two levels are used. Determine the center position of the measured point, and measure the distance of the measured point by the laser transmitter, laser receiver, and microcontroller. The height of the measured point has no effect on the measurement accuracy. The measurement speed is fast and the measurement accuracy is high; when one of the measured points When the lower part is blocked, by adding an auxiliary level, the rectangular principle is used to achieve equivalent measurement without the need to dismantle other parts of the vehicle body, effectively improving the measurement speed and accuracy.

Description

Indirect measurement method for measuring the size of the hard spot on the chassis of the accident vehicle

This application is a divisional application for an invention patent with the application number: 201911232397.6, application date: 2019-12-04, and the patent name "special equipment and measurement method for measuring the size of the hard point of an accident vehicle chassis".

technical field

The invention relates to the field of technical appraisal of road traffic accidents, in particular to an indirect measurement method for measuring the size of a hard spot on a chassis of an accident vehicle.

Background technique

At present, when the traffic police department of the Ministry of Public Security of my country conducts statistical analysis of road traffic accidents, the forms of road traffic accidents are classified into frontal collision, rear-end collision, side collision, opposite scraping, same-direction scraping, rolling, rollover, crash, etc. A fire, hitting a fixture, etc. According to the statistics of the Ministry of Public Security for one year, among all kinds of traffic accidents in my country, the proportion of collision accidents is up to 10%, and the casualties caused by collision accidents account for one. No matter the number of accidents, casualties or economic losses, vehicle collision traffic accidents account for more than the corresponding total, and become the main form of modern road traffic accidents.

After the vehicle collides, if the collision is serious, but the actual collision loss is small, the functions such as exercise, steering, and safety protection can be restored by repairing or replacing vulnerable parts, so as to resume exercise, but the body is generally not replaced. If the deformation of the body is too serious, it will be scrapped directly. If the deformation is moderate, only partial repair will be carried out. The common repair method of the body is sheet metal repair, which corrects the steel beam or steel plate in the deformed area. way, re-welding new parts, but the quality of sheet metal or welding process will cause the size of the repaired body to be inconsistent with the size of the original car, which will reduce the performance of the car. In addition, whether the body needs to be repaired after collision, it is often necessary to judge according to the measurement size;

However, during the measurement process, other equipment is usually installed on the size of the hard point hole that needs to be measured on the body (usually the installation hole or special measurement hole for important parts on the body), or there is other equipment below the hard point hole. Blocking, if these dimensions are accurately measured, it is necessary to remove the relevant parts on the body first, and then measure the body. For example, the common measurement holes include the engine mounting bolt holes, but there are engine connecting bolts in this hole, and the connecting bolts are surrounded by There are other parts (transmission, drive axle, etc.) that cannot be measured directly. Usually, when measuring the lateral or longitudinal dimensions of the body, a direct measurement point can be found, while when measuring the diagonal dimension, there is usually a larger obstruction around the measurement point. It is too many and difficult to dismantle; at present, manufacturers measure the body in white without equipment, so the body measurement device on the existing body production equipment cannot be used directly; if the engine and surrounding parts are removed, the cost is high and the cost is high. longer time;

On the other hand, the heights of various measuring points on the vehicle body are inconsistent. When measuring with a gauge (shown in Figure 1), the gauge is prone to incline, making the measurement data error larger; when there are other blocking parts below the measuring point, it cannot be used. Gauges.

To sum up, since there are other parts installed on the vehicle body, which are generally not considered to be dismantled, the body size measurement of the accident vehicle after the collision cannot use the special measuring device for the body-in-white provided by the manufacturer. The size of the hard point in the current body repair process is often inaccurate, and the performance of the repaired vehicle is degraded, which makes the body repair accident very easy to cause the owner, the maintenance personnel and the insurance company. disputes.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an indirect measurement method for measuring the size of the hard point of the chassis of an accident vehicle with fast measurement speed and high measurement accuracy, so as to solve the problems raised in the above-mentioned background art.

In order to achieve the above purpose, the present invention provides the following technical solutions: a special device for measuring the size of the hard point of the chassis of an accident vehicle, the special device includes two laser levels and an auxiliary level, and the structures of the laser level and the auxiliary level are Consistent, they are all 12-line levels. The 12-line level emits 12 rays that form three planes in the rectangular coordinate system, that is, every four rays form a plane, and the three planes are perpendicular to each other, forming the XY/YZ/ZX three planes in the rectangular coordinate system. The XY plane is the horizontal plane of the car, the ZX plane is the vertical plane along the longitudinal direction of the car, the YZ plane is the vertical plane along the lateral direction of the car, and the Z axis is the vertical direction of the car; The connecting flange plates are set on the side, and the main laser emission tube placed horizontally is installed on the connecting flange plate of one of the laser level and the auxiliary level by bolts, and the connecting flange of the other laser level is installed by bolts. The laser receiver tube is placed, the control line of the main laser transmitter tube is linked with the signal output end of the single-chip microcomputer, the signal output line of the laser receiver tube is linked with the signal input end of the single-chip microcomputer, and the signal output end of the single-chip microcomputer is set with a USB interface or a serial port interface directly with the notebook Computer or display connection; the upper and lower end faces of the two laser levels are respectively connected to an auxiliary laser emission tube placed vertically through bolts or snaps; two auxiliary laser emission tubes on a laser level emit The light is the Z axis in the rectangular coordinate system formed by 12 lines of light, and one emits light upward and the other emits light downward; the power lines of the main laser emission tube, the auxiliary laser emission tube, the single-chip microcomputer and the battery power supply of the laser level meter line connection;

The respective lower parts of the laser level and the auxiliary level are connected with a tripod, so that the laser level can be rotated around the vertical axis, that is, the Z axis;

The special equipment also includes an auxiliary scale, the auxiliary scale is an L-shaped right-angle plate, and three adjustment screws arranged in a triangle are arranged on the bottom surface of the L-shaped horizontal side of the auxiliary scale, and the auxiliary scale is inside and outside of its vertical part. Set multiple parallel horizontal lines at intervals, and set tick marks next to the horizontal lines.

Preferably, the laser level is YGDSSPY-0603 type 12-line level from Yagu Company, or 3D12-line level from Longyun Company; the single-chip microcomputer is STC89C52 single-chip microcomputer or STC90C51RC single-chip microcomputer.

Preferably, the lower bottom surface of the laser level is connected or welded with an interference fit to the upper end of the vertically placed connecting shaft, the lower part of the connecting shaft penetrates the bearing, and the bearing is placed in the bearing seat hole provided on the upper end surface of the tripod, so that the laser The type level can be rotated around the connecting shaft.

According to the above-mentioned special equipment for measuring the size of the hard point of the chassis of an accident vehicle, a method for measuring the size of the hard point is carried out, and the measurement method includes a horizontal correction step, a judgment step, a direct distance measurement step, and an indirect distance measurement step;

The described leveling steps are as follows: place two laser levels side by side on the bottom of the vehicle to be measured along the lateral direction of the vehicle, and the vehicle to be measured uses a lift to lift it to a certain height; then perform the following operations in sequence:

a. Place the auxiliary ruler on the flat ground near the vehicle under test, then place the two laser levels at the bottom of the vehicle, and adjust the height of the laser level so that the XY plane light emitted by the two laser levels illuminates the auxiliary ruler , and coincides with one of the horizontal lines on the auxiliary ruler;

b. Use a lift to raise the tested vehicle to a certain height, remove the protective plate or shield near the hard point to be measured on the chassis, the hard point is the process hole or installation hole specified in the vehicle maintenance manual or technical requirements, When the hard point is a mounting hole and a bolt is installed, the center of the hard point is the center of the bolt;

The judging steps are: if there is no obstruction directly below the two tested hard points, then go to step c, if one of the two tested hard points has an obstruction directly below and cannot be removed, but from the side You can see the measured hard point, then go to step e;

The described direct distance measurement steps are:

c. Move the laser level horizontally so that the light emitted by the auxiliary laser emission tubes of the two laser levels is located near the center of the hard point on the chassis under test, and adjust the height of the two laser levels and their respective tripods. Make the XY plane light emitted by the two laser levels irradiated on the auxiliary scale coincide with one of the horizontal lines, and continue to move the two laser levels horizontally, so that the auxiliary laser emission tubes of the two laser levels are directed upwards. The light is located at the center of the hard point on the chassis under test; go to step d;

d. Rotate the two laser levels so that the light emitted by the main laser emitting tube irradiates the laser receiving tube, read the distance through the laptop or display screen, and then enter step h;

The described indirect distance measurement steps are:

e. Record the measured hard point with no obstruction directly below as the first hard point, record the measured hard point with obstruction directly below as the second hard point, and move the auxiliary level to near the bottom of the first hard point , adjust the height of the auxiliary level and the tripod so that the XY plane light emitted by it coincides with one of the horizontal lines on the auxiliary scale, and then rotate the auxiliary level so that the YZ plane light emitted by it passes through the center of the first hard point;

Adjust the two laser levels so that the XY plane light emitted by the two on the auxiliary ruler coincides with the light emitted by the auxiliary level, and ensure that the three instruments are on the same horizontal plane;

Move the first laser level horizontally, and install a laser receiver on the laser level, so that the light from the YZ plane from the first laser level and the light from the ZX plane from the auxiliary level irradiate on the ground. The rays are coincident; move the second laser level so that the light emitted by the auxiliary laser transmitter set on it irradiates the center of the first hard point, and then rotate the second laser level so that the second laser level emits The light from the YZ plane on the ground coincides with the light on the ground from the ZX plane emitted by the first laser level;

At this time, the light from the two laser levels and the auxiliary level irradiated on the ground forms a rectangle, then the light from the ZX plane emitted by the second laser level and the light from the YZ plane from the auxiliary level irradiated on the ground are between the light on the ground. The intersection between the two points is the projection point of the second hard point on the ground; use a tape measure or a tower ruler to measure the distance between this projection point and the light spot that the auxiliary laser emitter of the second laser level irradiates on the ground downwards. The distance is the horizontal distance between the first hard point and the second hard point.

Compared with the prior art, the beneficial effect of the present invention is: when using special equipment to measure the hard point of the body chassis, the traditional direct measurement method is changed to the classification measurement, and when there is no obstruction under the measured point, two levels are used. Determine the center position of the measured point, and measure the distance of the measured point by the laser transmitter, laser receiver, and single-chip microcomputer. The height of the measured point has no effect on the measurement accuracy, the measurement speed is fast, and the measurement accuracy is high; when one of the measured points When the bottom is blocked, by adding an auxiliary level, the equivalent measurement is realized by using the principle of rectangle, and other parts on the body do not need to be removed, which effectively improves the measurement speed and accuracy.

Description of drawings

Figure 1 is a schematic diagram of the gauge measuring the hard point distance of the chassis;

2 is a schematic diagram of 12-line projection of a laser level;

Fig. 3 is a schematic diagram of the structure of a laser level;

Fig. 4 is a schematic diagram of a laser level and an auxiliary scale in the horizontal correction step;

5 is a schematic diagram of the measurement of two laser levels in the direct measurement step;

6 is a schematic diagram of the placement of two laser levels and an auxiliary level in the indirect measurement step;

Figure 7 is a schematic diagram of the connection of the single-chip microcomputer;

Figure 8 is the pin diagram of the STC89C52 microcontroller.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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, but not all of 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.

Please refer to FIGS. 1 to 8 . In the embodiment of the present invention, the special equipment includes two laser-type levels 1 and an auxiliary level 10. The structures of the laser-type level 1 and the auxiliary level 10 are the same, and both have 12 lines. The level, as shown by the thick solid line in Figure 2, the 12-line level emits 12 rays that form three planes in the rectangular coordinate system, that is, every four rays form a plane, and the three planes are perpendicular to each other, forming a rectangular coordinate system. XY/YZ/ZX three planes, of which the XY plane is the horizontal plane of the car, the ZX plane is the vertical plane along the longitudinal direction of the car, the YZ plane is the vertical plane along the lateral direction of the car, and the Z axis is the vertical direction of the car; laser Connecting flange plates are arranged on the sides of the laser-type level 1 and the auxiliary level 10, and the main laser emitting tube 31 placed horizontally is installed on the respective connecting flanges of one of the laser-type level 1 and the auxiliary level 10 by means of bolts, and the other laser-type level A horizontally placed laser receiver tube 32 is installed on the connecting flange of 1 by means of bolts. The control line of the main laser transmitter tube 31 is linked with the signal output end of the single-chip microcomputer 33, and the signal output line of the laser receiver tube 32 is connected with the signal input of the single-chip microcomputer 33. The signal output end of the single-chip microcomputer 33 is provided with a USB interface or a serial port interface to be directly connected to a notebook computer or a display screen; the upper and lower end surfaces of the two laser levels 1 are respectively connected by bolts or snaps to a vertically placed one. Auxiliary laser emission tube 35; the light emitted by two auxiliary laser emission tubes 35 on a laser level 1 is the Z axis in the rectangular coordinate system formed by 12 lines of light, and one emits light upwards, and one emits light downwards; The respective power lines of the main laser emitting tube 31 , the auxiliary laser emitting tube 35 , and the single-chip microcomputer 33 are connected to the battery power line of the laser level 1 ;

The lower parts of the laser level 1 and the auxiliary level 10 are connected to a tripod, so that the laser level 1 and the auxiliary level 10 can be rotated around the vertical axis, that is, the Z-axis; the bottom surface of the laser level 1 and the auxiliary level 10 can be placed vertically. The upper end of the connecting shaft 11 is connected or welded with an interference fit, the lower part of the connecting shaft 11 penetrates the bearing, and the bearing is placed in the bearing seat hole provided on the upper end face of the tripod 12, so that the laser level 1 can rotate around the connecting shaft 11, or can Directly select the standard turntable, set the turntable on the end face of the tripod, and set the laser level 1 and the auxiliary level 10 on the turntable;

The special equipment also includes an auxiliary scale 4, which is an L-shaped or T-shaped right-angle plate, and three adjustment screws 41 arranged in a triangular shape are arranged on the bottom surface of the L-shaped or T-shaped horizontal side of the auxiliary scale 4. The ruler 4 is provided with a plurality of parallel horizontal lines at intervals on the inner and outer sides of the vertical part, and scale lines are arranged beside the horizontal lines.

The laser level 1 is a YGDSSPY-0603 12-line level from Yagu Company, or a 3D12-line level from Longyun Company; the microcontroller 33 is a STC89C52 microcontroller or a STC90C51RC microcontroller.

According to the above-mentioned special equipment for measuring the size of the hard point of the chassis of the accident vehicle, the method for measuring the size of the hard point includes a horizontal correction step, a judgment step, a direct distance measurement step, and an indirect distance measurement step;

The described level correction steps are: as shown in Figure 4, place two laser levels 1 side by side at the bottom of the vehicle to be measured along the lateral direction of the vehicle, and the vehicle to be measured uses a lift to lift a certain height; Do the following:

a. As shown in Figure 4 and Figure 5, place the auxiliary scale 4 on the ground level near the vehicle under test, then place the two laser levels 1 on the bottom of the vehicle, and adjust the height of the laser level 1, Make the XY plane light emitted by the two laser levels 1 irradiate on the auxiliary scale 4, and coincide with the horizontal lines of the same height on the auxiliary scale 4;

b. Use a lift to raise the tested vehicle to a certain height, and remove the protective plate or easily removable shield near the hard point to be measured on the chassis. The hard point is the process hole specified in the vehicle maintenance manual or technical requirements or Mounting hole, when the hard point is the mounting hole and the bolt is installed, the center of the hard point is the center of the bolt;

The judging steps are as follows: if there is no obstruction directly under the two tested hard points, then proceed to step c, if one of the two tested hard points has an obstruction directly below and is not easy to remove or cannot be removed, If the measured hard point can be seen from the side, then go to step e;

The described direct distance measurement steps are:

c. Move the laser level 1 horizontally so that the light emitted by the auxiliary laser emission tubes 35 of the two laser levels 1 is located near the center of the hard point on the chassis under test, adjust the height of the two laser levels 1, and The respective tripods, so that the XY plane light emitted by the two laser levels 1 respectively irradiated on the auxiliary scale 4 coincides with one of the horizontal lines, and continue to move the two laser levels 1 horizontally, so that the two laser levels 1 are The light emitted upwards by the auxiliary laser emitting tube 35 is located at the center of the hard point on the chassis under test; go to step d;

d. Rotate the two laser levels 1, so that the light emitted by the main laser emitting tube 31 is irradiated on the laser receiving tube 32, read the distance through the notebook computer or the display screen, and then enter step h;

The described indirect distance measurement steps are:

e. Record the measured hard point with no obstruction directly below as the first hard point, and record the measured hard point with obstruction directly below as the second hard point, move the auxiliary level 10 to the side below the first hard point Nearby, adjust the height of the auxiliary level 10 and the tripod so that the XY plane light emitted by it coincides with one of the horizontal lines on the auxiliary scale 4, and then rotate the auxiliary level 10 so that the YZ plane light emitted by it passes through the center of the first hard point;

Adjust the two laser levels 1 so that the XY plane light emitted by the two irradiates the light on the auxiliary scale 4 and the light emitted by the auxiliary level 10 coincides with the light emitted by the auxiliary level 10 to ensure that the three instruments are on the same horizontal plane;

Move the first laser level 1 horizontally, and the laser receiver 32 is installed on the level, so that the light of the YZ plane emitted by the first laser level 1 irradiates the light on the ground and the light of the ZX plane emitted by the auxiliary level 10. The light on the ground coincides; move the second laser level 1 so that the light emitted by the auxiliary laser transmitter 35 set on it irradiates the center of the first hard point, and then rotate the second laser level 1, adjust the A laser level 1, the position and angle of the auxiliary level 10; as shown in FIG. 6;

Make the light from the YZ plane emitted by the second laser level 1 irradiated on the ground coincide with the light from the ZX plane emitted by the first laser level 1 on the ground; at this time, the two laser levels 1 and the auxiliary The light irradiated by the level 10 on the ground forms a rectangle, then the intersection point between the light from the ZX plane emitted by the second laser level 1 and the light from the YZ plane emitted by the auxiliary level 10 irradiated on the ground is The projection point of the second hard point on the ground; use a tape measure or a tower ruler to measure the distance between the projection point and the light spot irradiated downward on the ground by the auxiliary laser transmitter 35 of the second laser level 1, which is The horizontal distance between the first hard point and the second hard point. As shown in FIG. 6 , the distance is the distance between the laser transmitter 31 and the laser receiver 32, plus the distance between the laser transmitter 31 and the laser receiver 32 and the center of the respective equipment.

The laser level 1 is the YGDSSPY-0603 type 12-line level from Yagu Company, or the 3D12-line level from Longyun Company; the laser level can also be designed according to needs; Both microcontrollers include processors, memory, timers, reset circuits, general-purpose I/O interfaces, and other necessary components to form the smallest control system of single-chip microcontrollers. Therefore, no additional electronic devices are required, and they can be directly connected to sensors or actuators. Data reading or control function; the wireless signal transmission module 34 is a wifi module or a bluetooth module, such as a BT08B bluetooth module or a SPP-CA bluetooth module; it can also be a USR-C322 WIFI module or a UT-9061WIFI module; the laser transmitter , The laser receiver can be a KLH-01T-20hz sensor module, the module comes with a programmable controller, the programmable controller can be directly connected to a laptop computer through the USB interface for programming, or can be programmed through the I/O port. The single-chip microcomputer 33 sends the distance signal, and the outdoor effective distance measurement is 50m; the laser transmitter and laser receiver can be the TW10S-UART laser distance measurement sensor module, which also has its own programmable controller and communication interface, which can be used after the measured data Communicate directly with STC89C52 microcontroller.

This technical solution has been made into a product, and has been tested in multiple accident identifications conducted by the Xihua Forensic Appraisal Institute of Xihua University. Because the product formed by this technical solution has not been calibrated for the time being, it is not used as the basis for the identification conclusion. However, the field test results show that the measurement process is fast, and the measurement size error is smaller than that of the gauge. Therefore, the measurement speed and accuracy of the diagonal size are better than those of the gauge, and it has broad application prospects and Market value.

When using special equipment for hard point measurement of body chassis, the traditional direct measurement method is changed to classified measurement. When there is no obstruction under the measured point, the center position of the measured point is determined by two levels, and the center position of the measured point is determined by the laser transmitter, laser The receiver and the single-chip microcomputer measure the distance of the measured point. The height of the measured point has no effect on the measurement accuracy. The measurement speed is fast and the measurement accuracy is high. When one of the measured points is blocked below, an auxiliary level is added to realize the realization by using the principle of rectangle. Equivalent measurement, and does not need to remove other parts on the body, effectively improving the measurement speed and accuracy.

Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it is still possible to modify the technical solutions described in the foregoing embodiments, or to perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (1)

1. An indirect measurement method for measuring the size of a hard spot on the chassis of an accident vehicle, the special equipment used in the measurement method includes two laser-type levels (1), and an auxiliary level (10), the laser-type level (1) and the auxiliary level ( 10) The structure is the same, all are 12-line level, 12-line level emits 12 rays that form three planes in the rectangular coordinate system, that is, every four rays form a plane, and the three planes are perpendicular to each other, forming XY// in the rectangular coordinate system. The three planes of YZ/ZX, the laser level (1) and the auxiliary level (10) are provided with connecting flanges on the sides, and bolts are passed through the respective connecting flanges of one of the laser level (1) and the auxiliary level (10). The horizontally placed main laser emitting tube (31) is installed in the same way, and the horizontally placed laser receiving tube (32) is installed on the connecting flange of the other laser level (1) by means of bolts. The control of the main laser emitting tube (31) The line is connected with the signal output end of the single chip microcomputer (33), the signal output line of the laser receiver tube (32) is connected with the signal input end of the single chip computer (33), and the signal output end of the single chip computer (33) is provided with a USB interface or a serial port interface directly with the notebook Computer or display screen connection; the respective upper and lower end faces of the two laser-type levels (1) are respectively connected to an auxiliary laser emission tube (35) placed vertically by means of bolts or snaps; a laser-type level (1) is connected to The light emitted by the two auxiliary laser emission tubes (35) is the Z axis in the rectangular coordinate system formed by 12 lines of light, and one emits light upwards and the other emits light downwards; the main laser emission tube (31), the auxiliary laser The respective power lines of the launch tube (35) and the single-chip microcomputer (33) are connected to the battery power line of the laser level (1); The respective lower parts of the laser level (1) and the auxiliary level (10) are connected with a tripod, so that the laser level (1) and the auxiliary level (10) can be rotated around the vertical axis, that is, the Z-axis; the laser level (1) and the auxiliary level (10) The respective lower parts are connected with the tripod, so that the laser level (1) and the auxiliary level (10) can be rotated around the vertical axis, namely the Z-axis; the rotating structure is the lower bottom surface of the laser level (1) and the auxiliary level (10). Connect or weld with an interference fit to the upper end of the connecting shaft (11) placed vertically, the lower part of the connecting shaft (11) penetrates the bearing, and the bearing is placed in the bearing seat hole provided on the upper end face of the tripod (12), so that the laser level (1) It can be rotated around the connecting shaft (11); or a turntable is arranged on the upper end face of the tripod, and a laser level (1) and an auxiliary level (10) are arranged on the turntable; The special equipment further comprises an auxiliary scale (4), the auxiliary scale (4) is an L-shaped right-angle plate, and three adjustment screws (41) arranged in a triangle are arranged on the bottom surface of the L-shaped horizontal side of the auxiliary scale (4). , the auxiliary scale (4) is provided with a plurality of parallel horizontal lines at intervals on the inner and outer sides of its vertical part, and scale lines are arranged beside the horizontal lines; According to the above-mentioned special equipment, the indirect measurement method for measuring the size of the hard point of the chassis of the accident vehicle is characterized in that: The measurement method includes a horizontal correction step, a judgment step, and an indirect distance measurement step; The described level correction steps are: placing two laser levels (1) side by side at the bottom of the vehicle to be measured along the lateral direction of the vehicle, and the vehicle to be measured is lifted to a certain height by a lift; then the following operations are performed in sequence: a. Place the auxiliary ruler (4) on the flat ground near the vehicle under test, then place the two laser levels (1) on the bottom of the vehicle, and adjust the height of the laser level (1) so that the two laser levels (1) (1) The XY plane light emitted is irradiated on the auxiliary scale (4), and coincides with one of the horizontal lines on the auxiliary scale (4); b. Use a lift to raise the tested vehicle to a certain height, remove the protective plate or shield near the hard point to be measured on the chassis, the hard point is the process hole or installation hole specified in the vehicle maintenance manual or technical requirements, When the hard point is a mounting hole and a bolt is installed, the center of the hard point is the center of the bolt; The judging step is as follows: if one of the two tested hard points has an obstruction directly below and cannot be removed, but the tested hard point can be seen from the side, then proceed to step c; The described indirect distance measurement steps are: c. Record the measured hard point with no obstruction directly below as the first hard point, and record the measured hard point with obstruction directly below as the second hard point, and move the auxiliary level (10) to the first hard point Near the bottom of the side, adjust the height of the auxiliary level (10) and the tripod so that the XY plane light emitted by it coincides with one of the horizontal lines on the auxiliary ruler (4), and then rotate the auxiliary level (10) The ray passes through the center of the first hard point; Adjust the two laser levels (1) so that the XY plane light emitted by the two irradiates the auxiliary scale (4) and the light emitted by the auxiliary level (10) coincides with the light emitted by the auxiliary level (10) to ensure that the three instruments are on the same horizontal plane; Move the first laser level (1) horizontally, a laser receiver (32) is installed on the level, so that the light of the YZ plane emitted by the first laser level (1) irradiates the light on the ground and the auxiliary level (10) The emitted light of the ZX plane irradiates the light on the ground; move the second laser level (1) so that the light emitted by the auxiliary laser emitter (35) set on it irradiates the center of the first hard point, and then rotates The second laser level (1) makes the light from the YZ plane emitted by the second laser level (1) irradiate on the ground and the light from the ZX plane from the first laser level (1) to irradiate the ground light coincidence; At this moment, the light from the two laser levels (1) and the auxiliary level (10) irradiated on the ground forms a rectangle, then the light from the ZX plane emitted by the second laser level (1) irradiates the light on the ground and the auxiliary level. (10) The intersection point between the emitted YZ plane and the light on the ground is the projection point of the second hard point on the ground; use a tape measure or a tower ruler to measure the projection point with the aid of the second laser level (1). The distance between the light spots that the laser transmitter (35) irradiates downward on the ground is the horizontal distance between the first hard spot and the second hard spot.

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