CN111692975B - Direct measurement method for measuring dimension of hard spot of chassis of accident vehicle - Google Patents
Direct measurement method for measuring dimension of hard spot of chassis of accident vehicle Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
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- G—PHYSICS
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- G—PHYSICS
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
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Abstract
The invention discloses a direct measurement method for measuring the dimension of a hard spot of an accident vehicle chassis, wherein special equipment comprises two laser gradienters and an auxiliary gradienter, wherein a main laser transmitting tube and a laser receiving tube which are horizontally arranged are arranged on the side surfaces of the gradienter and the auxiliary gradienter, a control line of the main laser transmitting tube is linked with a signal output end of a singlechip; when one of them measured point below is sheltered from, through adding supplementary spirit level, utilize the rectangle principle to realize equivalent measurement, and need not demolish other parts on the automobile body, effectively improved measuring speed and precision.
Description
The application has the following application numbers: 201911232397.6, filing date: 2019-12-04, patent name "special equipment for measuring dimension of hard spot of chassis of accident vehicle and measuring method".
Technical Field
The invention relates to the technical identification field of road traffic accidents, in particular to a direct measurement method for measuring the dimension of hard spots of a chassis of an accident vehicle.
Background
At present, when the traffic police department of the ministry of public security of China carries out statistical analysis on road traffic accidents, the road traffic accidents are classified into front collision, rear-end collision, side collision, opposite scraping, same-direction scraping, rolling over, car falling, fire catching, fixed object collision and the like. According to the statistics of the ministry of public security of one year, the proportion of collision accidents in various traffic accidents in China can be reached, casualties caused by the collision accidents account for one, and vehicle-to-vehicle collision traffic accidents including front collision, rear-end collision and side collision account for more than corresponding total number of accidents, casualties and economic losses, so that the traffic accidents become the main form of modern road traffic accidents.
After a vehicle is collided, if the collision condition is serious, but the actual collision loss is small, the functions of running, steering, safety protection and the like can be recovered by repairing and replacing easily-damaged parts, so that running is recovered, but the vehicle body is generally not replaced, if the vehicle body is deformed too seriously, the vehicle body is directly scrapped, if the deformation is moderate, only partial repair is performed, the common vehicle body repair means is metal plate repair, a steel beam or a steel plate in a deformed area is corrected, a partial cutting mode is adopted in an area with large deformation, new parts are welded again, but the size of the repaired vehicle body is possibly inconsistent with the size of the original vehicle due to the good quality of the metal plate or welding process, so that the performance of the vehicle is reduced, and therefore, the size measurement of the repaired vehicle body is an important work in vehicle body repair; in addition, whether the automobile body needs to be repaired after collision or not is often judged according to the measurement size;
however, in the measurement process, other devices are generally installed on the sizes of hard point hole sites (generally, installation hole sites of important parts on the vehicle body or special measurement holes) to be measured on the vehicle body, or other devices are shielded below the hard point hole sites, if the sizes are accurately measured, relevant parts on the vehicle body need to be removed first, and then the vehicle body is measured, for example, common measurement hole sites include engine installation bolt holes, but engine connecting bolts exist in the holes, and other parts (a transmission, a drive axle and the like) are arranged around the connecting bolts, so that direct measurement cannot be directly performed, when the transverse or longitudinal sizes of the vehicle body are generally measured, direct measurement points can be found, and when the diagonal oblique sizes are measured, more shielding objects are generally arranged around one measurement point and are not easy to remove; at present, all automobile body measurement of manufacturers is to measure a white automobile body without equipment, so an automobile body measuring device on the existing automobile body production equipment cannot be directly used; if the engine and surrounding parts are dismantled, the cost is high and the time is long;
on the other hand, the heights of all measuring points on the vehicle body are not consistent, and when the gauge (shown in figure 1) is used for measuring, the gauge is easy to incline, so that the error of the measured data is large; the gauge cannot be used either when there are other shielding components below the measurement point.
In summary, because other parts are installed on the vehicle body, and the vehicle body is generally not considered to be dismantled, the dimension measurement of the vehicle body of the collided accident vehicle cannot use a special measurement device for the white vehicle body provided by a manufacturer, the existing measurement gauge has larger error, and some blocked hole sites cannot be measured, so that the dimension measurement of hard spots in the current vehicle body repairing process is often not accurate enough, the performance of the repaired vehicle is reduced, and the vehicle body repairing accident easily causes disputes among vehicle owners, maintenance personnel and insurance companies.
Disclosure of Invention
The invention aims to provide a direct measurement method for measuring the dimension of a hard spot of a chassis of an accident vehicle, which has high measurement speed and high measurement precision, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the device comprises two laser gradienters and an auxiliary gradienter, wherein the laser gradienters and the auxiliary gradienter have consistent structures and are 12 line gradienters, the 12 line gradienters emit 12 light rays forming three planes of a rectangular coordinate system, namely every four light rays form a plane, the three planes are mutually vertical to form an XY/YZ/ZX three planes in the rectangular coordinate system, wherein the XY plane is the horizontal plane of an automobile, the ZX plane is the vertical plane along the longitudinal direction of the automobile, the YZ plane is the vertical plane along the transverse direction of the automobile, and the Z axis is the vertical direction of the automobile; the side surfaces of the laser gradienter and the auxiliary gradienter are provided with connecting flange plates, a main laser transmitting tube which is horizontally arranged is arranged on the connecting flange plate of one of the laser gradienter and the auxiliary gradienter in a bolt mode, a laser receiving tube which is horizontally arranged is arranged on the connecting flange plate of the other laser gradienter in a bolt mode, a control line of the main laser transmitting tube is linked with a signal output end of the singlechip, a signal output line of the laser receiving tube is linked with a signal input end of the singlechip, and a USB interface or a serial interface is arranged at the signal output end of the singlechip and is directly connected with a notebook computer or a display screen; the upper end surface and the lower end surface of each of the two laser gradienters are respectively connected with an auxiliary laser emission tube which is vertically arranged in a bolt or buckle mode; the light rays emitted by two auxiliary laser emission tubes on one laser type level meter are Z-axis in a rectangular coordinate system formed by 12 lines of light rays, one of the light rays is emitted upwards, and the other is emitted downwards; the power lines of the main laser emission tube, the auxiliary laser emission tube and the single chip microcomputer are connected with the power line of a storage battery of the laser level meter;
the lower parts of the laser type gradienter and the auxiliary gradienter are connected with a tripod so that the laser type gradienter can rotate around a vertical axis, namely a Z axis;
the device also comprises an auxiliary scale, the auxiliary scale is an L-shaped right-angle plate, three adjusting screws which are arranged in a triangular mode are arranged on the bottom surface of the L-shaped horizontal edge of the auxiliary scale, the inner side and the outer side of the vertical portion of the auxiliary scale are respectively provided with a plurality of parallel horizontal lines at intervals, and scale marks are arranged beside the horizontal lines.
Preferably, the laser type level meter is a YGDSSPY-0603 12 line level meter of the Yagu company or a 3D12 line level meter of the Longyun company; the single chip microcomputer is an STC89C52 single chip microcomputer or an STC90C51RC single chip microcomputer.
Preferably, the lower part bottom surface of laser type spirit level is connected or the welding with the upper end interference fit of the connecting axle of vertical placing, and the bearing is penetrated to the lower part of connecting axle, and the bearing is placed in the bearing housing hole that the tripod up end set up, makes laser type spirit level can wind the connecting axle rotation.
According to the special device for measuring the hard spot size of the chassis of the accident vehicle, the method for measuring the hard spot size comprises a horizontal correction step, a judgment step, a direct distance measurement step and an indirect distance measurement step;
the horizontal correction step comprises the following steps: placing two laser gradienters at the bottom of a measured vehicle side by side along the transverse direction of the automobile, and lifting the measured vehicle to a certain height by using a lifting machine; the following operations are then carried out in sequence:
a. placing the auxiliary scale at a flat ground part near a detected vehicle, then placing two laser gradienters at the bottom of the vehicle, and adjusting the height gauge of the laser gradienters to enable XY plane light rays emitted by the two laser gradienters to irradiate the auxiliary scale and to be superposed with one horizontal line on the auxiliary scale;
b. the method comprises the following steps of (1) lifting a tested vehicle to a certain height by using a lifting machine, removing a protection plate or a shielding object near a hard point to be measured on a chassis, wherein the hard point is a process hole or an installation hole specified in a vehicle maintenance manual or technical requirements, and when the hard point is the installation hole and is provided with a bolt, the center of the hard point is the center of the bolt;
the judging step is as follows: if no shielding object is arranged right below the two hard points to be measured, the step c is carried out, if one of the two hard points to be measured has the shielding object right below and cannot be detached, and the hard point to be measured can be seen from the side surface, the step e is carried out;
the direct distance measurement step is as follows:
c. horizontally moving the laser gradienters to enable the upward light rays emitted by the auxiliary laser emitting tubes of the two laser gradienters to be positioned near the center of a hard point on the chassis of the tested vehicle body, adjusting the heights of the two laser gradienters and respective tripods to enable the light rays of the XY plane light rays emitted by the two laser gradienters to be irradiated on the auxiliary scale to be superposed with one horizontal line, and continuously horizontally moving the two laser gradienters to enable the upward light rays emitted by the auxiliary laser emitting tubes of the two laser gradienters to be positioned at the center of the hard point on the chassis of the tested vehicle body; entering the step d;
d. rotating the two laser gradienters to enable the light rays emitted by the main laser emitting tube to irradiate the laser receiving tube, reading the distance through a notebook computer or a display screen, and then entering the step h;
the indirect distance measuring step comprises the following steps:
e. recording a measured hard point without a shielding object right below as a first hard point, recording the measured hard point with the shielding object right below as a second hard point, moving an auxiliary level to the position near the lower part of the first hard point side, adjusting the height of the auxiliary level and a tripod to enable XY plane light rays emitted by the auxiliary level to coincide with one horizontal line on an auxiliary scale, and then rotating the auxiliary level to enable YZ plane light rays emitted by the auxiliary level to pass through the center of the first hard point;
adjusting the two laser gradienters to ensure that the light rays emitted by the two laser gradienters, which are irradiated on the auxiliary scale by the XY plane light rays, coincide with the light rays emitted by the auxiliary gradienter to ensure that the three gradienters are positioned on the same horizontal plane;
horizontally moving a first laser type level meter, wherein a laser receiver is arranged on the laser type level meter, so that the light rays of a YZ plane emitted by the first laser type level meter and irradiated on the ground coincide with the light rays of a ZX plane emitted by an auxiliary level meter and irradiated on the ground; moving the second laser level meter to enable the light emitted by the auxiliary laser emitter arranged on the second laser level meter to irradiate the center of the first hard point, and then rotating the second laser level meter to enable the light emitted by the YZ plane of the second laser level meter to irradiate the ground to be superposed with the light emitted by the ZX plane of the first laser level meter to irradiate the ground;
at the moment, the light rays of the two laser gradienters and the auxiliary gradienter irradiated on the ground form a rectangle, and the intersection point between the light rays of the ZX plane emitted by the second laser gradienter irradiated on the ground and the light rays of the YZ plane emitted by the auxiliary gradienter irradiated on the ground is the projection point of the second hard point on the ground; and measuring the distance between the projection point and a light point of the auxiliary laser emitter of the second laser type level instrument, which is irradiated downwards on the ground by using a measuring tape or a tower ruler, namely the horizontal distance between the first hard point and the second hard point.
Compared with the prior art, the invention has the beneficial effects that: when special equipment is used for measuring hard points of a vehicle body chassis, the traditional direct measurement mode is changed into classified measurement, when no shielding object exists below a measured point, the center position of the measured point is determined by two level gauges, the distance of the measured point is measured by a laser transmitter, a laser receiver and a single chip microcomputer, the height of the measured point has no influence on the measurement precision, the measurement speed is high, and the measurement precision is high; when one of them measured point below is sheltered from, through adding supplementary spirit level, utilize the rectangle principle to realize equivalent measurement, and need not demolish other parts on the automobile body, effectively improved measuring speed and precision.
Drawings
FIG. 1 is a schematic diagram of a gauge measuring hard spot distance of a vehicle chassis;
FIG. 2 is a schematic line projection of laser level 12;
FIG. 3 is a schematic diagram of a laser level configuration;
FIG. 4 is a schematic view of a laser level and an auxiliary scale during a leveling step;
FIG. 5 is a schematic view of a two laser level measurement in a direct measurement step;
FIG. 6 is a schematic view showing placement of two laser levels and an auxiliary level in an indirect measurement step;
FIG. 7 is a schematic diagram of the connection of a single chip microcomputer;
fig. 8 is a pin diagram of an STC89C52 single chip microcomputer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 8, in the embodiment of the present invention, the special apparatus includes two laser levels 1 and one auxiliary level 10, the laser levels 1 and the auxiliary level 10 have the same structure and are both 12-line levels, as shown by thick solid lines in fig. 2, the 12-line level emits 12 light rays forming three planes of a rectangular coordinate system, that is, every four light rays form one plane, the three planes are perpendicular to each other, and form three XY/YZ/ZX planes in the rectangular coordinate system, where the XY plane is a horizontal plane of an automobile, the ZX plane is a vertical plane along a longitudinal direction of the automobile, the YZ plane is a vertical plane along a transverse direction of the automobile, and the Z axis is a vertical direction of the automobile; the side surfaces of the laser levels 1 and the auxiliary levels 10 are provided with connecting flange plates, a main laser transmitting tube 31 which is horizontally arranged is arranged on the respective connecting flange plate of one of the laser levels 1 and the auxiliary levels 10 in a bolt mode, a laser receiving tube 32 which is horizontally arranged is arranged on the connecting flange plate of the other laser level 1 in a bolt mode, a control line of the main laser transmitting tube 31 is linked with a signal output end of a single chip microcomputer 33, a signal output line of the laser receiving tube 32 is linked with a signal input end of the single chip microcomputer 33, and a USB interface or a serial interface is arranged at a signal output end of the single chip microcomputer 33 and is directly connected with a notebook computer or a display screen; the upper end surface and the lower end surface of each of the two laser gradienters 1 are respectively connected with an auxiliary laser emission tube 35 which is vertically arranged in a bolt or buckle mode; the light rays emitted by the two auxiliary laser emission tubes 35 on one laser type level 1 are Z-axis in a rectangular coordinate system formed by 12 light rays, one of the light rays is emitted upwards, and the other is emitted downwards; the power lines of the main laser emission tube 31, the auxiliary laser emission tube 35 and the singlechip 33 are respectively connected with the power line of the storage battery of the laser type level meter 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 rotate around a vertical axis, namely a Z axis; the bottom surfaces of the lower parts of the laser level 1 and the auxiliary level 10 can be connected with or welded with the upper end of a vertically arranged connecting shaft 11 in an interference fit manner, the lower part of the connecting shaft 11 penetrates through a bearing, the bearing is arranged in a bearing seat hole arranged on the upper end surface of a tripod 12, so that the laser level 1 can rotate around the connecting shaft 11, a standard turntable can be directly selected, the upper end surface of the tripod is provided with the turntable, and the laser level 1 and the auxiliary level 10 are arranged on the turntable;
the special equipment further comprises an auxiliary scale 4, wherein the auxiliary scale 4 is an L-shaped or T-shaped right-angle plate, three adjusting screws 41 which are arranged in a triangular shape are arranged on the bottom surface of the L-shaped or T-shaped horizontal edge of the auxiliary scale 4, the auxiliary scale 4 is provided with a plurality of parallel horizontal lines at intervals in the inner side and the outer side of the vertical part of the auxiliary scale 4, and scale marks are arranged beside the horizontal lines.
The laser type level meter 1 is a YGDSSPY-0603 12 line level meter of the Yagu company or a 3D12 line level meter of the Longyun company; the single chip microcomputer 33 is an STC89C52 single chip microcomputer or an STC90C51RC single chip microcomputer.
According to the special device for measuring the hard spot size of the chassis of the accident vehicle, the method for measuring the hard spot size comprises a horizontal correction step, a judgment step, a direct distance measurement step and an indirect distance measurement step;
the horizontal correction step comprises the following steps: as shown in fig. 4, two laser levels 1 are arranged side by side along the transverse direction of the automobile at the bottom of the vehicle to be measured, and the vehicle to be measured is lifted by a certain height by using a lifter; the following operations are then carried out in sequence:
a. as shown in fig. 4 and 5, the auxiliary scale 4 is placed on a flat ground near the vehicle to be measured, then the two laser levels 1 are placed at the bottom of the vehicle, and the height gauges of the laser levels 1 are adjusted, so that XY plane light rays emitted by the two laser levels 1 are irradiated on the auxiliary scale 4 and are overlapped with horizontal lines with the same height on the auxiliary scale 4;
b. the method comprises the following steps of (1) lifting a tested vehicle to a certain height by using a lifting machine, removing a protection plate near a hard point to be measured on a chassis or a shielding object easy to remove, wherein the hard point is a process hole or an installation hole specified in a vehicle maintenance manual or technical requirements, and when the hard point is the installation 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 no shielding object is arranged right below the two hard points to be measured, the step c is carried out, if one of the two hard points to be measured has the shielding object right below the hard points to be measured and is not easy to remove or cannot be removed, and the hard points to be measured can be seen from the side surface, the step e is carried out;
the direct distance measurement step is as follows:
c. horizontally moving the laser gradienters 1 to enable the upward light rays emitted by the auxiliary laser emitting tubes 35 of the two laser gradienters 1 to be positioned near the center of a hard point on the chassis of the tested vehicle body, adjusting the heights of the two laser gradienters 1 and respective tripods to enable the light rays of the XY plane light rays emitted by the two laser gradienters 1 respectively and irradiated on the auxiliary scale 4 to be superposed with one horizontal line, and continuously horizontally moving the two laser gradienters 1 to enable the upward light rays emitted by the auxiliary laser emitting tubes 35 of the two laser gradienters 1 to be positioned at the center of the hard point on the chassis of the tested vehicle body; entering the step d;
d. rotating the two laser gradienters 1 to make the light emitted by the main laser emitting tube 31 irradiate the laser receiving tube 32, and reading the distance through a notebook computer or a display screen;
the indirect distance measuring step comprises the following steps:
e. recording a measured hard point without a shielding object right below as a first hard point, recording a measured hard point with a shielding object right below as a second hard point, moving the auxiliary level 10 to the position near the lower part of the first hard point side, adjusting the height of the auxiliary level 10 and a tripod to enable XY plane light rays emitted by the auxiliary level to coincide with one of horizontal lines on the auxiliary scale 4, and then rotating the auxiliary level 10 to enable YZ plane light rays emitted by the auxiliary level to pass through the center of the first hard point;
adjusting the two laser gradienters 1 to enable the light rays emitted by the two laser gradienters 1 and the XY plane light rays emitted by the two laser gradienters to irradiate the auxiliary scale 4 to be superposed with the light rays emitted by the auxiliary gradienter 10, and ensuring that the three instruments are positioned on the same horizontal plane;
horizontally moving a first laser type level 1, wherein a laser receiver 32 is arranged on the level, so that the light rays of the YZ plane emitted by the first laser type level 1 and irradiated on the ground coincide with the light rays of the ZX plane emitted by an auxiliary level 10 and irradiated on the ground; moving the second laser level 1 to make the light emitted by the auxiliary laser emitter 35 arranged on the second laser level 1 irradiate the center of the first hard point, and then adjusting the positions and angles of the first laser level 1 and the auxiliary level 10 when rotating the second laser level 1; as shown in fig. 6;
the light rays of the YZ plane emitted by the second laser type level meter 1 and irradiated on the ground are superposed with the light rays of the ZX plane emitted by the first laser type level meter 1 and irradiated on the ground; at this time, the light rays of the two laser levels 1 and the auxiliary level 10 irradiating the ground form a rectangle, and the intersection point between the light ray of the ZX plane emitted by the second laser level 1 irradiating the ground and the light ray of the YZ plane emitted by the auxiliary level 10 irradiating the ground is the projection point of the second hard point on the ground; the distance between this projection point and the point where the auxiliary laser transmitter 35 of the second laser level 1 shines down on the ground is measured using a tape measure or a tape measure, i.e. 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 distances from the laser transmitter 31 and the laser receiver 32 to the center of the respective devices.
The laser level meter 1 is a YGDSSPY-0603 12 line level meter of the Yagu company or a 3D12 line level meter of the Longyun company; the laser level meter can also be designed according to the requirement; the singlechip 33 is an STC89C52 singlechip or an STC90C51RC singlechip, and the two singlechips respectively comprise necessary parts which form a singlechip minimum control system, such as a processor, a memory, a timer, a reset circuit, a general I/O interface and the like, so that other electronic devices are not required to be additionally added, and the singlechip can be directly connected with a sensor or an actuator to realize a 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 an SPP-CA bluetooth module; or a USR-C322WIFI module or a UT-9061WIFI module; the laser transmitter and the laser receiver can be a KLH-01T-20hz sensor module which is provided with a programmable controller, the programmable controller can be directly connected with a notebook computer through a USB interface for programming, and can also send a distance signal to the singlechip 33 through an I/O port, so that the outdoor effective distance measurement is 50 m; the laser transmitter and the laser receiver can be a TW10S-UART laser ranging sensor module which is also provided with a programmable controller and a communication interface and can directly communicate with an STC89C52 single chip microcomputer after data are measured.
The technical scheme is manufactured into a product, and tests are carried out in a plurality of accident identification carried out by the Ciwa justice identification of the Ciwa university, and the product formed by the technical scheme is not measured and calibrated temporarily, so that the product is not taken as the basis of an identification conclusion, but the field test effect shows that the measuring process is rapid, the error of the measured dimension is smaller than that of a gauge, and the diagonal line dimension measuring speed and precision are better than those of the gauge, so that the method has wide application prospect and market value.
When special equipment is used for measuring hard points of a vehicle body chassis, the traditional direct measurement mode is changed into classified measurement, when no shielding object exists below a measured point, the center position of the measured point is determined by two level gauges, the distance of the measured point is measured by a laser transmitter, a laser receiver and a single chip microcomputer, the height of the measured point has no influence on the measurement precision, the measurement speed is high, and the measurement precision is high; when one of them measured point below is sheltered from, through adding supplementary spirit level, utilize the rectangle principle to realize equivalent measurement, and need not demolish other parts on the automobile body, effectively improved measuring speed and precision.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (1)
1. A direct measurement method for measuring the dimension of a hard spot on a chassis of an accident vehicle comprises two laser gradienters (1) and an auxiliary gradienter (10), wherein the laser gradienter (1) and the auxiliary gradienter (10) have the same structure and are both 12-line gradienters, the 12-line gradienter emits 12 light rays forming three planes of a rectangular coordinate system, every four light rays form one plane, the three planes are mutually vertical to form three XY/YZ/ZX planes in the rectangular coordinate system, the side surfaces of the two laser gradienters (1) and the auxiliary gradienter (10) are respectively provided with a connecting flange plate, a main laser emission pipe (31) which is horizontally arranged is arranged on the connecting flange plate of one laser gradienter (1) and the auxiliary gradienter (10) in a bolt mode, a laser receiving pipe (32) which is horizontally arranged is arranged on the connecting flange plate of the other laser gradienter (1) in a bolt mode, a control line of the main laser emitting tube (31) is connected with a signal output end of the singlechip (33), a signal output line of the laser receiving tube (32) is connected with a signal input end of the singlechip (33), and a signal output end of the singlechip (33) is provided with a USB interface or a serial interface to be directly connected with a notebook computer or a display screen; the upper end surface and the lower end surface of each of the two laser gradienters (1) are respectively connected with an auxiliary laser emission tube (35) which is vertically arranged in a bolt or buckle mode; the light rays emitted by the two auxiliary laser emission tubes (35) on each laser type level meter (1) are Z-axis in a rectangular coordinate system formed by 12 light rays, one of the light rays is emitted upwards, and the other is emitted downwards; the power lines of the main laser emission tube (31), the auxiliary laser emission tube (35) and the single chip microcomputer (33) are connected with the power line of a storage battery of the laser type level meter (1);
the lower parts of the two laser gradienters (1) and the auxiliary gradienters (10) are respectively connected with a tripod so that the laser gradienters (1) and the auxiliary gradienters (10) can rotate around a vertical axis, namely a Z axis; the rotating structure is that the bottom surfaces of the lower parts of the laser level (1) and the auxiliary level (10) are in interference fit connection or welding with the upper end of a vertically arranged connecting shaft (11), a bearing penetrates through the lower part of the connecting shaft (11), and the bearing is arranged in a bearing seat hole arranged on the upper end surface of a tripod (12), so that the laser level (1) can rotate around the connecting shaft (11); or the rotating structure is that a turntable is arranged on the upper end surface of the tripod, and a laser level (1) and an auxiliary level (10) are arranged on the turntable;
the device also comprises an auxiliary scale (4), wherein the auxiliary scale (4) is an L-shaped right-angle plate, three adjusting screws (41) which are arranged in a triangular shape are arranged on the bottom surface of an L-shaped horizontal side of the auxiliary scale (4), a plurality of parallel horizontal lines are respectively arranged at the inner side and the outer side of the vertical part of the auxiliary scale (4) at intervals, and scale marks are arranged beside the horizontal lines;
according to the above device, the direct measurement method for measuring the size of hard spot of chassis of accident vehicle is characterized in that: the method is used for keeping the positions right below two measured hard points free of shielding, and the measuring method comprises a horizontal correcting step and a direct distance measuring step;
the horizontal correction step comprises the following steps: placing two laser gradienters (1) at the bottom of a measured vehicle side by side along the transverse direction of an automobile, and lifting the measured vehicle to a certain height by using a lifting machine; the following operations are then carried out in sequence:
a. placing the auxiliary scale (4) at a flat ground position near a detected vehicle, then placing the two laser gradienters (1) at the bottom of the vehicle, and adjusting the height gauges of the laser gradienters (1) to enable XY plane light rays emitted by the two laser gradienters (1) to irradiate the auxiliary scale (4) and to be superposed with one horizontal line on the auxiliary scale (4);
b. the method comprises the following steps of (1) lifting a tested vehicle to a certain height by using a lifting machine, removing a protection plate or a shielding object near a hard point to be measured on a chassis, wherein the hard point is a process hole or an installation hole specified in a vehicle maintenance manual or technical requirements, and when the hard point is the installation hole and is provided with a bolt, the center of the hard point is the center of the bolt;
the direct distance measurement step is as follows:
c. horizontally moving the laser gradienters (1), enabling the upward light rays emitted by the auxiliary laser emitting tubes (35) of the two laser gradienters (1) to be positioned near the center of a hard point on the chassis of the vehicle body to be measured, adjusting the heights of the two laser gradienters (1) and respective tripods, enabling the light rays emitted by the XY plane light rays emitted by the two laser gradienters (1) and irradiated on the auxiliary scale (4) to be coincided with one horizontal line, continuously and horizontally moving the two laser gradienters (1), and enabling the upward light rays emitted by the auxiliary laser emitting tubes (35) of the two laser gradienters (1) to be positioned at the center of the hard point on the chassis of the vehicle body to be measured; entering the step d;
d. the two laser gradienters (1) are rotated to enable the light rays emitted by the main laser emitting tube (31) to irradiate the laser receiving tube (32), and the distance is read through a notebook computer or a display screen.
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