Automobile body-in-white automatic detection system

Abstract

The invention discloses an automobile body-in-white automatic measuring system which comprises a scanning cabin, two-axis gantry trusses are arranged on the periphery in the scanning cabin respectively, and scanners driven by a multi-axis scanning robot are arranged on the two-axis gantry trusses on the left side and the right side respectively. Light following cameras driven by a multi-axis linkage mechanism are arranged on the two-axis gantry trusses at the front end and the rear end respectively, each light following camera is used for tracking and positioning the absolute positions of the two scanners in a unified measurement coordinate system in real time, an automatic guiding transfer platform is arranged in the scanning cabin, a plurality of fixing holes are evenly distributed in the upper portion of the automatic guiding transfer platform, and the two scanners are arranged in the scanning cabin. A plurality of measuring brackets are detachably connected above the automatic guide transfer platform through fixing holes, positioning expansion pins are arranged above the measuring brackets, and the positioning expansion pins and the measuring brackets are switched between a fixed connection state and an elastic micro-movable connection state through fixing pins; the device can automatically measure and detect the body in white, and has the advantages of high detection efficiency, convenience in detection and labor saving.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile detection, and in particular to an automatic detection system for an automobile body. Background Art

[0002] With the continuous development of the automotive industry, market demands for automotive quality are becoming increasingly stringent. As the foundation of the entire vehicle, the body-in-white (BIW), must be rigorously quality-assured to meet customer needs. To ensure the quality of interior and exterior trim assembly, the BIW's welded assembly dimensions must meet predetermined theoretical specifications. Therefore, BIW measurement is essential to ensure production quality. Traditional measurement methods typically utilize coordinate measuring machines (CMMs), but this method is cumbersome, time-consuming, and inefficient, making it incapable of meeting industry production requirements. Summary of the Invention

[0003] The object of the present invention is to provide an automatic detection system for automobile bodies, which can automatically measure and detect the body-in-white (BIW) and has the advantages of high detection efficiency, convenient detection and labor saving.

[0004] To achieve this object, the present invention adopts the following technical solutions: Provided is an automatic measurement system for automobile body-in-white, comprising a scanning cabin, wherein two-axis gantry trusses are respectively arranged on all four sides of the scanning cabin, scanners driven by multi-axis scanning robots are respectively arranged on the two-axis gantry trusses on the left and right sides, and follow-up light cameras driven by multi-axis linkage mechanisms are respectively arranged on the two-axis gantry trusses at the front and rear ends, each group of follow-up light cameras being used to simultaneously track and locate the absolute positions of two scanners in a unified measurement coordinate system in real time, an automatic guide transfer platform is provided in the scanning cabin, a plurality of fixing holes are evenly distributed above the automatic guide transfer platform, a plurality of measuring brackets are detachably connected to the top of the automatic guide transfer platform through the fixing holes, a positioning expansion pin is provided above the measuring bracket, wherein the positioning expansion pin and the measuring bracket are switched in connection state by a fixing pin, and the connection state includes: fixed connection and elastic micro-active connection.

[0005] As a preferred solution for the automatic measurement system of the automobile body in white, the multi-axis scanning robot is a six-axis robot. The base of the multi-axis scanning robot is installed on the two-axis gantry trusses on the left and right sides. The two-axis gantry trusses on the left and right sides are used to drive the multi-axis scanning robot to slide in the horizontal and vertical directions. The scanner is fixed to the end of the robotic arm of the multi-axis scanning robot, and the multi-axis scanning robot is used to drive the scanner to move freely in three-dimensional space.

[0006] As a preferred solution for the automobile body-in-white automatic measurement system, the multi-axis linkage mechanism is a four-axis robot, the base of the multi-axis linkage mechanism is installed on the two-axis gantry trusses at the front and rear ends, the two-axis gantry trusses at the front and rear ends are used to drive the multi-axis linkage mechanism to slide in the horizontal and vertical directions, the tracking light camera is fixed to the end of the robotic arm of the multi-axis linkage mechanism, and the multi-axis linkage mechanism is used to drive the tracking light camera to move freely in three-dimensional space.

[0007] As a preferred solution for the automatic measurement system of the automobile body in white, there are multiple fixing holes in a rectangular array above the automatic guided transfer platform, and four connecting holes are distributed rectangularly around the measuring bracket. The spacing of the four connecting holes matches the spacing of the rectangular array of the fixing holes. The measuring bracket is fixed to the fixing hole of the automatic guided transfer platform by a locking screw passing through the connecting hole.

[0008] As a preferred solution for the automatic measurement system for automobile body-in-white, one of the diagonals of the bottom of the automatic guided transfer platform is provided with a driving wheel, the other diagonal of the bottom of the automatic guided transfer platform is provided with a universal wheel, and support feet are distributed around the bottom of the automatic guided transfer platform and are driven up and down by cylinders.

[0009] As a preferred solution of the automobile body-in-white automatic measurement system, a guide rail is provided in the middle of the bottom of the automatic guide transfer platform, and a guide groove corresponding to the guide rail is provided in the middle of the floor of the scanning cabin.

[0010] As a preferred solution for the automobile body-in-white automatic measurement system, a positioning scanning camera is provided at the bottom of the automatic guided transfer platform on one side of the guide rail, and a positioning QR code is provided at the floor of the scanning cabin on one side of the guide groove.

[0011] As a preferred solution of the automobile body-in-white automatic measurement system, an upper plate, a middle plate and a lower plate are distributed in sequence from top to bottom between the positioning expansion pin and the measuring bracket, the upper plate is fixed below the positioning expansion pin, the lower plate is fixed above the measuring bracket, the upper plate is horizontally slightly elastically slidably connected to the top of the middle plate, and can be fixed by the fixing pin, the middle plate is horizontally slightly elastically slidably connected to the top of the lower plate, and can be fixed by the fixing pin, the sliding direction between the upper plate and the middle plate and the sliding direction between the middle plate and the lower plate are perpendicular to each other.

[0012] As a preferred solution of the automobile body-in-white automatic measurement system, corresponding limiting ears with limiting holes are provided on the same side of the upper plate and the middle plate, and corresponding limiting ears with limiting holes are provided on the same side of the lower plate and the middle plate, and the limiting holes are used for limiting and fixing the fixing pins.

[0013] As a preferred solution of the automobile body-in-white automatic measurement system, a slider is fixed at the bottom of the upper plate, a slide groove is provided above the middle plate, and the upper plate is slidably connected to the slide groove of the middle plate through the slider, a slider is fixed at the bottom of the middle plate, and a slide groove is provided above the lower plate, and the middle plate is slidably connected to the slide groove of the lower plate through the slider, and springs are respectively provided on the front and rear sides of the sliding direction between the slider and the slide groove.

[0014] The beneficial effects of the present invention are as follows: the automobile body-in-white automatic measurement system proposed by the present invention is provided with two groups of scanners driven by multi-axis scanning robots on the two-axis gantry trusses on the left and right sides, and two groups of follow-up light cameras driven by multi-axis linkage mechanisms on the two-axis gantry trusses at the front and rear ends, respectively. Each group of follow-up light cameras is used to simultaneously track and locate the positions of the two scanners in real time, which can flexibly and automatically perform ultra-high-precision dynamic three-dimensional scanning measurement of the body-in-white, and has the advantages of high detection efficiency, convenient detection and labor-saving; and the automatic guided transfer platform is detachably connected to a plurality of measuring brackets through evenly distributed fixing holes, and the user can adjust the position and number of the measuring brackets according to different vehicle models, and has high versatility; further, the connection state between the positioning expansion pin and the measuring bracket is switched by the fixing pin, and the main and auxiliary positioning expansion pins only need to be switched to the fixed connection state, and the positioning expansion pins at other positions can be switched to the elastic micro-active connection state, which can ensure that the body-in-white is fixed firmly and accurately, and can adapt to the reasonable error of the body-in-white, and ensure that each positioning expansion pin can be positioned and fixed smoothly and quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0016] Figure 1 1 is a schematic structural diagram of an automobile body-in-white measurement system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the installation structure of a two-axis gantry truss according to an embodiment of the present invention; Figure 3This is a schematic diagram of the installation structure of a multi-axis scanning robot according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the installation structure of the measurement bracket according to one embodiment of the present invention; Figure 5 This is a schematic structural diagram of an automatic guided transfer platform according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the bottom structure of the automatic guided transfer platform according to one embodiment of the present invention; Figure 7 This is a schematic structural diagram of a measuring bracket according to an embodiment of the present invention; Figure 8 This is a cross-sectional view of the connection structure between the measuring bracket and the positioning expansion pin according to one embodiment of the present invention.

[0017] In the picture: 1. Scanning cabin; 2. Two-axis gantry truss; 3. Multi-axis scanning robot; 4. Scanner; 5. Multi-axis linkage mechanism; 6. Automatic guide transfer platform; 7. Measuring bracket; 8. Positioning expansion pin; 9. Follow light camera; 10. Driving wheel; 11. Universal wheel; 12. Support foot; 13. Guide rail; 14. Positioning scanning camera; 15. Upper plate; 16. Middle plate; 17. Lower plate; 18. Limiting ear; 19. Slider; 20. Slide groove; 21. Threaded hole; 22. Sliding hole. DETAILED DESCRIPTION

[0018] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0019] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0020] Reference Figures 1-8, an embodiment of the present invention provides an automatic measurement system for an automobile body-in-white, comprising a scanning cabin 1, wherein two-axis gantry trusses 2 are respectively arranged on all four sides of the scanning cabin 1, and scanners 4 driven by a multi-axis scanning robot 3 are respectively arranged on the two-axis gantry trusses 2 on the left and right sides, and tracking cameras 9 driven by a multi-axis linkage mechanism 5 are respectively arranged on the two-axis gantry trusses 2 at the front and rear ends, each group of tracking cameras 9 is used to simultaneously track and locate the absolute positions of the two scanners 4 in a unified measurement coordinate system in real time, an automatic guide transfer platform 6 is provided in the scanning cabin 1, a plurality of fixing holes are evenly distributed above the automatic guide transfer platform 6, a plurality of measuring brackets 7 are detachably connected to the top of the automatic guide transfer platform 6 through the fixing holes, a positioning expansion pin 8 is provided above the measuring bracket 7, wherein the positioning expansion pin 8 and the measuring bracket 7 are switched in connection state by a fixing pin, and the connection state includes: fixed connection and elastic micro-active connection. Specifically, the scanner 4 uses a laser scanning ball head, which has a built-in laser emitter and dual cameras for performing laser scanning. Each set of follow-up light cameras 9 is equipped with two sets of ultra-wide viewing angle and ultra-high pixel optical camera groups, which track the dynamic coordinate system composed of twelve groups of targets on the laser scanning ball head in real time. A large-format laser network is used for high-density acquisition, and ultra-high-precision dynamic three-dimensional scanning and measurement can be completed without sticking points or powder spraying, and is not affected by the intensity of ambient light.

[0021] In the above technical solution, two groups of scanners 4 driven by multi-axis scanning robots 3 are respectively provided on the two-axis gantry trusses 2 on the left and right sides, and two groups of follow-up light cameras 9 driven by multi-axis linkage mechanisms 5 are respectively provided on the two-axis gantry trusses 2 at the front and rear ends, and each follow-up light camera 9 is used to simultaneously track and locate the positions of the two scanners 4 in real time, which can flexibly and automatically perform ultra-high-precision dynamic three-dimensional scanning measurement of the white body, and has the advantages of high detection efficiency, convenient detection and labor-saving; and the automatic guided transfer platform 6 is detachably connected to a plurality of measuring brackets 7 through evenly distributed fixing holes, and the user can adjust the position and number of the measuring brackets 7 according to different vehicle models, and has high versatility; further, the connection state between the positioning expansion pin 8 and the measuring bracket 7 is switched by a fixing pin. During scanning and measurement, only the main and auxiliary positioning expansion pins 8 need to be switched to a fixed connection state, and the positioning expansion pins 8 at other positions can be switched to an elastic micro-active connection state, which can ensure that the white body is fixed firmly and accurately, and can adapt to reasonable errors of the white body, and ensure that each positioning expansion pin 8 can be positioned and fixed smoothly and quickly.

[0022] In some embodiments, the multi-axis scanning robot 3 is a six-axis robot, and the base of the multi-axis scanning robot 3 is installed on the two-axis gantry trusses 2 on the left and right sides. The two-axis gantry trusses 2 on the left and right sides are used to drive the multi-axis scanning robot 3 to slide in the horizontal and vertical directions. The scanner 4 is fixed at the end of the robotic arm of the multi-axis scanning robot 3, and the multi-axis scanning robot 3 is used to drive the scanner 4 to move freely in three-dimensional space.

[0023] In some embodiments, the multi-axis linkage mechanism 5 is a four-axis robot, and the base of the multi-axis linkage mechanism 5 is installed on the two-axis gantry trusses 2 at the front and rear ends. The two-axis gantry trusses 2 at the front and rear ends are used to drive the multi-axis linkage mechanism 5 to slide in the horizontal and vertical directions. The tracking camera 9 is fixed to the end of the robotic arm of the multi-axis linkage mechanism 5, and the multi-axis linkage mechanism 5 is used to drive the tracking camera 9 to move freely in three-dimensional space.

[0024] In some embodiments, the automated guided transfer platform 6 has a plurality of fixing holes arranged in a rectangular array above it. The measurement bracket 7 is surrounded by four connecting holes arranged in a rectangular pattern, with the spacing between the four connecting holes matching the spacing of the rectangular array of fixing holes. The measurement bracket 7 is secured to the fixing holes of the automated guided transfer platform 6 via locking screws passing through the connecting holes. This structural design allows for flexible adjustment of the number and position of the measurement brackets 7 based on the body-in-white (BIW) dimensions of different vehicle models, resulting in high versatility.

[0025] In some embodiments, the bottom of the automated guided transport platform 6 is provided with a drive wheel 10 on one diagonal line, and a universal wheel 11 on the other diagonal line. Support legs 12, which are driven up and down by pneumatic cylinders, are distributed around the bottom of the automated guided transport platform 6. The drive wheels 10 of the automated guided transport platform 6 drive the automated guided transport platform 6 into the scanning cabin 1. When the automated guided transport platform 6 reaches the corresponding detection point in the scanning cabin 1, the pneumatic cylinder drives the support legs 12 to extend downward, propping up the automated guided transport platform 6, completing its positioning and fixation, allowing scanning and measurement to begin. This system uses an automatic guided transfer platform 6 to position and install the body-in-white. Multiple automatic guided transfer platforms 6 can be used for rotational movement and replacement. When one automatic guided transfer platform 6 carrying the body-in-white is performing scanning and measurement in the scanning cabin 1, other automatic guided transfer platforms 6 can perform positioning and installation of the body-in-white outside the scanning cabin 1. When the scanning and measurement of the body-in-white in the scanning cabin 1 are completed, the automatic guided transfer platform 6 in the scanning cabin 1 automatically exits, and the next automatic guided transfer platform 6 loaded with the body-in-white to be measured automatically enters the scanning cabin 1 for inspection, thereby achieving continuous operation of the scanning cabin 1, reducing the waiting time for the installation of the body-in-white, and improving efficiency. Furthermore, a guide rail 13 is provided in the middle of the bottom of the automatic guide transfer platform 6, and a guide groove corresponding to the guide rail 13 is provided in the middle of the floor of the scanning cabin 1. This structural design enables the automatic guide transfer platform 6 to move to the measurement point more accurately and smoothly.

[0026] Furthermore, a positioning scanning camera 14 is installed on the bottom of the automated guided transfer platform 6, located on one side of the guide rail 13. A positioning QR code is installed on the floor of the scanning cabin 1, located on one side of the guide rail. The coordinated structure of the positioning scanning camera 14 and the QR code ensures that the automated guided transfer platform 6 can automatically and accurately position itself.

[0027] In some embodiments, an upper plate 15, a middle plate 16, and a lower plate 17 are distributed between the positioning expansion pin 8 and the measuring bracket 7 from top to bottom. The upper plate 15 is fixed below the positioning expansion pin 8, and the lower plate 17 is fixed above the measuring bracket 7. The upper plate 15 is horizontally slightly elastically slidably connected to the top of the middle plate 16 and can be fixed by the fixing pin. The middle plate 16 is horizontally slightly elastically slidably connected to the top of the lower plate 17 and can be fixed by the fixing pin. The sliding direction between the upper plate 15 and the middle plate 16 and the sliding direction between the middle plate 16 and the lower plate 17 are perpendicular to each other. This structural design allows the positioning expansion pin 8 to perform micro-movements in the horizontal direction, can adapt to reasonable errors of the body-in-white, and ensure that each positioning expansion pin 8 can be positioned and fixed smoothly and quickly.

[0028] Specifically, corresponding stop ears 18 with stop holes are provided on the same side of the upper plate 15 and the middle plate 16, and corresponding stop ears 18 with stop holes are provided on the same side of the lower plate 17 and the middle plate 16. The stop holes are used to limit and fix the fixing pins. This structural design makes switching the connection state of the positioning expansion pin 8 more convenient and simple, and the design is ingenious.

[0029] In some embodiments, a slider 19 is fixed to the bottom of the upper plate 15, a chute 20 is provided above the middle plate 16, and the upper plate 15 is slidably connected to the chute 20 of the middle plate 16 via the slider 19. A slider 19 is fixed to the bottom of the middle plate 16, and a chute 20 is provided above the lower plate 17. The middle plate 16 is slidably connected to the chute 20 of the lower plate 17 via the slider 19. Springs are provided on the front and rear sides of the sliding direction between the slider 19 and the chute 20. This structural design allows elastic sliding between the slider 19 and the chute 20, and the sliding distance is limited, which serves as a limit for micro-elastic sliding.

[0030] Specifically, the slider 19 is provided with threaded holes 21 at its front and rear ends in the sliding direction, and the slide groove 20 is provided with sliding holes 22 at its front and rear ends in the sliding direction, facing the threaded holes 21. One end of a sliding rod is threadedly connected to each end of the slider 19, and the other end of the sliding rod slides through the sliding holes 22. The spring is sleeved on the outer circumference of the sliding rod and is located between the slider 19 and the slide groove 20. This structural design ensures stable and smooth sliding between the slider 19 and the slide groove 20, and allows for easy and convenient installation and removal.

[0031] In the description of the present invention, it should be understood that the terms "middle", "length", "upper", "lower", "front", "back", "vertical", "horizontal", "inner", "outer", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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 orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature "on" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. "Multiple" means at least two, such as two or three, unless otherwise expressly specified or limited.

[0033] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0034] The above is only for explaining the embodiments of the present invention and is not intended to limit the present invention. For those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention without creative work should be included in the scope of protection of the present invention.

Claims

1. An automatic measurement system for automobile body-in-white, characterized in that: The invention comprises a scanning cabin (1), wherein two-axis gantry trusses (2) are respectively arranged around the scanning cabin (1), scanners (4) driven by a multi-axis scanning robot (3) are respectively arranged on the two-axis gantry trusses (2) on the left and right sides, and light-following cameras (9) driven by a multi-axis linkage mechanism (5) are respectively arranged on the two-axis gantry trusses (2) at the front and rear ends, each group of light-following cameras (9) is used to simultaneously track and locate the absolute positions of two scanners (4) in a unified measurement coordinate system in real time, an automatic guide transfer platform (6) is arranged in the scanning cabin (1), a plurality of fixing holes are evenly distributed above the automatic guide transfer platform (6), a plurality of measuring brackets (7) are detachably connected to the upper part of the automatic guide transfer platform (6) through the fixing holes, and a positioning expansion pin (8) is arranged above the measuring bracket (7), wherein the positioning expansion pin (8) and the measuring bracket (7) are switched in connection state through a fixing pin, and the connection state includes: fixed connection and elastic micro-movable connection.

2. The automobile body-in-white automatic measurement system according to claim 1, characterized in that: The multi-axis scanning robot (3) is a six-axis robot. The base of the multi-axis scanning robot (3) is installed on the two-axis gantry trusses (2) on the left and right sides. The two-axis gantry trusses (2) on the left and right sides are used to drive the multi-axis scanning robot (3) to slide in the horizontal and vertical directions. The scanner (4) is fixed to the end of the mechanical arm of the multi-axis scanning robot (3). The multi-axis scanning robot (3) is used to drive the scanner (4) to move freely in three-dimensional space.

3. The automobile body-in-white automatic measurement system according to claim 1, characterized in that: The multi-axis linkage mechanism (5) is a four-axis robot. The base of the multi-axis linkage mechanism (5) is installed on the two-axis gantry trusses (2) at the front and rear ends. The two-axis gantry trusses (2) at the front and rear ends are used to drive the multi-axis linkage mechanism (5) to slide in the horizontal and vertical directions. The follow-up light camera (9) is fixed to the end of the mechanical arm of the multi-axis linkage mechanism (5). The multi-axis linkage mechanism (5) is used to drive the follow-up light camera (9) to move freely in three-dimensional space.

4. The automobile body-in-white automatic measurement system according to claim 1, characterized in that: The automatic guide transfer platform (6) has a plurality of fixing holes in a rectangular array above, and the measuring bracket (7) has four connecting holes distributed in a rectangular pattern around it. The spacing between the four connecting holes matches the spacing between the rectangular array of the fixing holes. The measuring bracket (7) is fixed to the fixing holes of the automatic guide transfer platform (6) by means of locking screws passing through the connecting holes.

5. The automobile body-in-white automatic measurement system according to claim 1, characterized in that: A driving wheel (10) is provided on one diagonal line of the bottom of the automatic guide transfer platform (6), a universal wheel (11) is provided on the other diagonal line of the bottom of the automatic guide transfer platform (6), and supporting feet (12) are distributed around the bottom of the automatic guide transfer platform (6) and are driven to extend and retract upward and downward by cylinders.

6. The automobile body-in-white automatic measurement system according to claim 5, characterized in that: A guide rail (13) is provided in the middle of the bottom of the automatic guide transfer platform (6), and a guide groove corresponding to the guide rail (13) is provided in the middle of the floor of the scanning cabin (1).

7. The automobile body-in-white automatic measurement system according to claim 6, characterized in that: The bottom of the automatic guide transfer platform (6) is located on one side of the guide rail (13) and is provided with a positioning scanning camera (14), and the floor of the scanning cabin (1) is located on one side of the guide groove and is provided with a positioning QR code.

8. The automobile body-in-white automatic measurement system according to claim 1, characterized in that: An upper plate (15), a middle plate (16) and a lower plate (17) are distributed in sequence from top to bottom between the positioning expansion pin (8) and the measuring bracket (7), the upper plate (15) is fixed below the positioning expansion pin (8), the lower plate (17) is fixed above the measuring bracket (7), the upper plate (15) is horizontally slightly elastically slidably connected to the upper part of the middle plate (16), and can be fixed by the fixing pin, the middle plate (16) is horizontally slightly elastically slidably connected to the upper part of the lower plate (17), and can be fixed by the fixing pin, the sliding direction between the upper plate (15) and the middle plate (16) and the sliding direction between the middle plate (16) and the lower plate (17) are perpendicular to each other.

9. The automobile body-in-white automatic measurement system according to claim 8, characterized in that: The upper plate (15) and the middle plate (16) are provided with corresponding limiting ears (18) with limiting holes on the same side, and the lower plate (17) and the middle plate (16) are provided with corresponding limiting ears (18) with limiting holes on the same side, and the limiting holes are used for limiting and fixing the fixing pins.

10. The automobile body-in-white automatic measurement system according to claim 8, characterized in that: A slider (19) is fixed at the bottom of the upper plate (15), a slide groove (20) is provided above the middle plate (16), and the upper plate (15) is slidably connected to the slide groove (20) of the middle plate (16) through the slider (19), a slider (19) is fixed at the bottom of the middle plate (16), a slide groove (20) is provided above the lower plate (17), and the middle plate (16) is slidably connected to the slide groove (20) of the lower plate (17) through the slider (19), and springs are respectively provided on the front and rear sides of the sliding direction between the slider (19) and the slide groove (20).

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