Automobile chassis detection system and method

Abstract

The present invention relates to an automobile chassis detection system and method, comprising a test platform; a detector for performing dimensional detection on the automobile chassis is provided on the test platform; an X-direction positioner and a Y-direction positioner are distributed on the test platform to locate the position of the automobile chassis; a first bracket, a second bracket, a third bracket, and a fourth bracket are provided on the test platform; the first bracket is located between the X-direction positioner and the Y-direction positioner; the second bracket is located on the Y-direction side of the first bracket; the third bracket is located on the X-direction side of the first bracket; and the fourth bracket is located diagonally to the first bracket; the first bracket, the second bracket, the third bracket, and the fourth bracket are used to carry the transferred automobile chassis; and steel balls for ball positioning are provided on the first bracket, the second bracket, the third bracket, and the fourth bracket. The present invention has a reasonable design, a compact structure, and is easy to use.

Description

Technical Field

[0001] The invention relates to an automobile chassis detection system and method. Background Art

[0002] The automobile chassis is the benchmark for automobile processing and assembly. The level of its processing accuracy directly affects the overall quality of the automobile. How to inspect the chassis assembly and measure its flatness and other form and position tolerances to see if they meet production requirements has become an urgent technical problem that needs to be solved. During inspection at existing inspection stations, the chassis is directly placed on the positioning blocks, which makes adjustment on the positioning blocks difficult, resulting in severe wear on the positioning blocks and affecting measurement accuracy.

[0003] AGV carts are widely used in the production turnover of enterprises. The existing AGV carts are all purchased standard products. During operation, they need to be repositioned. The multiple lifting and lowering of the tire will cause collision or wear on the surface of the cart, thus affecting its accuracy. Especially when transferring to the measuring platform, multiple adjustments are required, which is time-consuming and labor-intensive. Summary of the Invention

[0004] The technical problem to be solved by the present invention is generally to provide an automobile chassis carrier and a detection system and method.

[0005] In order to solve the above problems, the technical solution adopted by the present invention is:

[0006] A vehicle chassis inspection system includes a test platform; a detector for performing dimensional inspection on the vehicle chassis is provided on the test platform; an X-axis positioner and a Y-axis positioner are distributed on the test platform to locate the position of the vehicle chassis; a first bracket, a second bracket, a third bracket, and a fourth bracket are provided on the test platform;

[0007] The first bracket is located between the X-direction positioner and the Y-direction positioner; the second bracket is located on the Y-direction side of the first bracket, the third bracket is located on the X-direction side of the first bracket, and the fourth bracket is located diagonally opposite to the first bracket;

[0008] The first bracket, the second bracket, the third bracket and the fourth bracket are used to carry the transferred automobile chassis;

[0009] Steel balls for ball positioning are provided on the first bracket, the second bracket, the third bracket and the fourth bracket;

[0010] A fixed steel ball with 6 degrees of freedom is set in the first bracket.

[0011] The second bracket is provided with a rolling steel ball which can rotate in three degrees of freedom around the X axis, Y axis and Z axis;

[0012] The third bracket and the fourth bracket are provided with rotating steel balls having only one degree of freedom of rotation in the Y-axis.

[0013] As a further improvement of the above technical solution:

[0014] The X-axis locator and the Y-axis locator are laser rangefinders, acoustic rangefinders or infrared rangefinders.

[0015] A fifth bracket is provided on the X-axis side of the third bracket; a sixth bracket is provided on the X-axis side of the fourth bracket; the fifth bracket and the sixth bracket have free steel balls that can rotate around the X-axis, Y-axis, and Z-axis and move along the X-axis and Y-axis with five degrees of freedom.

[0016] A vehicle chassis detection method includes the following steps:

[0017] Step 1: First, the car chassis is sent to the steel ball on the top of the carrier by a manipulator or a crane, and the hook of the manipulator or the crane is separated from the car chassis through the carrier process notch; then, the car chassis is placed on the steel ball on the top of the carrier, and the upper pulling head of the carrier is driven by the upper push rod of the carrier to move in the vertical guide groove of the carrier, so that the steel ball on the top of the carrier drives the car chassis to rise and separate from the carrier positioning block; then, based on the two carrier Y-axis positioning seats, the car chassis is detected by laser, light / acoustic reflection or scale. Detect whether the vehicle chassis is tilted; secondly, if it is tilted, push the vehicle chassis to the right position through the vehicle Y-axis rocker; thirdly, use the vehicle Y-axis positioning seat to measure whether the vehicle chassis is in the middle of the vehicle frame; then, if it is not in the center, move the vehicle bottom push rod and the vehicle upper push rod to drive the vehicle chassis to move horizontally to the middle; finally, pull back the vehicle bottom push rod, so that the vertical guide groove of the vehicle on the inclined wedge of the vehicle tilt descends in the vehicle upper pulling head, and the vehicle chassis sits on the vehicle positioning support block;

[0018] In step 2, the AGV first delivers the vehicle chassis to the test station, aligning the chassis with the centerline of the test station. The AGV then lowers the vehicle frame until the chassis lands on top of the vehicle positioning block. The AGV then leaves.

[0019] Step a: First, the vehicle chassis is positioned on the third, fifth, fourth, and sixth brackets. Then, the fifth, fourth, and sixth brackets are used to move the vehicle chassis in the Y direction so that it aligns with the centerline of the test platform. Next, the vehicle chassis is pushed in the X direction onto the first and second brackets.

[0020] Step A, detecting whether the vehicle chassis is skewed by using a Y-axis locator; if skew occurs, executing step B;

[0021] Step B: Using the first bracket as a fulcrum, the second bracket has three degrees of freedom, simulating the principle of a universal wheel, and the third and fourth brackets have one degree of freedom, simulating the front wheels, to adjust the vehicle chassis;

[0022] Step C: The Y-axis locator and the X-axis locator measure the distance of the vehicle chassis, thereby determining the coordinates of the vehicle chassis;

[0023] Step D: the detector performs detection.

[0024] The invention has reasonable design, low cost, durability, safety and reliability, simple operation, time and labor saving, money saving, compact structure and convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure used when entering the detection station of the present invention.

[0026] Figure 2 It is a schematic structural diagram of the trolley of the present invention.

[0027] Figure 3 It is a schematic diagram of the explosion structure of the trolley of the present invention.

[0028] Figure 4 It is a schematic structural diagram of the detection station of the present invention.

[0029] Figure 5 It is a schematic diagram of the improved structure of the detection station of the present invention.

[0030] Including: 1. AGV car; 2. Prefabricated carrier device; 3. Carrier frame; 4. Carrier process notch; 5. Carrier positioning bracket; 6. Carrier X-axis positioning seat; 7. Carrier Y-axis positioning seat; 8. Carrier Y-axis swing arm; 9. Carrier center groove; 10. Carrier bottom Y-axis inclined wedge; 11. Carrier bottom push rod; 12. Carrier bottom horizontal guide rail; 13. Carrier upper push rod; 14. Carrier upper pulling head; 15. Carrier tilt guide Rail; 16. Carrier tilt upper wedge; 17. Carrier vertical guide groove; 18. Carrier top steel ball; 19. Test platform; 20. Detector; 21. X-axis positioner; 22. Y-axis positioner; 23. First bracket; 24. Second bracket; 25. Third bracket; 26. Fourth bracket; 27. Fifth bracket; 28. Sixth bracket; 29. Fixed steel ball; 30. Rotating steel ball; 31. Rolling steel ball; 32. Free steel ball. DETAILED DESCRIPTION

[0031] like Figure 1-5 As shown, the automobile chassis carrier of this embodiment includes a prefabricated AGV trolley 1, which can be prefabricated and purchased externally; a prefabricated carrier device 2 is installed on the AGV trolley 1, which is connected by bolts and fixed with positioning pins;

[0032] The prefabricated carrier device 2 includes a carrier frame 3 mounted on the AGV trolley 1. It adopts a steel structure to prevent deformation and realize rapid positioning of the vehicle chassis. Carrier positioning blocks 5 are respectively provided at the four corners above the carrier frame 3 to support the vehicle chassis and bear the weight of the vehicle chassis.

[0033] A carrier process notch 4 is provided on the side of the carrier frame 3 to facilitate lifting the car chassis, and is located above the carrier positioning support block 5 and below the car chassis;

[0034] The carrier frame 3 has a carrier center groove 9 at its center, which avoids stress being applied to the center, but rather to the four corners, resulting in a more rational process. This also fully utilizes the central space, which is not available in the prior art. This saves space and minimizes floor space.

[0035] A carrier X-direction positioning seat 6 is provided in front of the carrier frame 3, and at least two carrier Y-direction positioning seats 7 are provided on one side of the carrier frame 3. Preferably, laser or electric eye is used for measurement to avoid obstruction. A carrier Y-direction swing arm 8 is provided on the carrier frame 3 for adjusting the center line of the carrier frame 3 to the X direction to achieve swing positioning and reduce width. It is mainly aimed at heavy-load chassis and is the preferred solution.

[0036] As a major invention of the present invention, a carrier bottom transverse guide rail 12 is arranged horizontally at the bottom of the carrier frame 3 to realize transverse guidance, and a carrier bottom Y-direction inclined wedge 10 moves on the carrier bottom transverse guide rail 12. A carrier bottom push rod 11 is arranged on one side of the carrier frame 3 to drive the carrier bottom Y-direction inclined wedge 10 to move on the carrier bottom transverse guide rail 12; at the same time, lifting and lateral movement adjustment is realized.

[0037] A carrier upper push rod 13 is provided on the other side of the carrier frame 3, and a carrier upper pulling head 14 is provided at the end of the carrier upper push rod 13; the carrier upper pulling head 14 includes two fixed plates mounted on the ends of the carrier upper push rod 13, thereby realizing lateral pushing and pulling;.

[0038] A carrier inclined guide rail 15 is provided on the upper inclined surface of the Y-direction inclined wedge 10 at the bottom of the carrier, which is inclined along the Y direction. A carrier inclined upper inclined wedge 16 moves along the carrier inclined guide rail 15, and a carrier vertical guide groove 17 is provided on the side wall of the carrier inclined upper inclined wedge 16. The clever thing about it is that after horizontal positioning, the lifting and lowering can be achieved by moving the Y-direction inclined wedge 10 at the bottom of the carrier, which is not available in the prior art inclined wedges.

[0039] The end of the upper push rod 13 of the vehicle passes through the vertical guide slot 17 of the vehicle. Two fixed plates are located on either side of the vertical guide slot 17 of the vehicle. The upper horizontal surface of the inclined wedge 16 of the vehicle is provided with a top steel ball 18 of the vehicle for contacting the lower surface of the vehicle chassis. The top steel ball 18 of the vehicle reduces friction and facilitates adjustment.

[0040] The automobile chassis inspection system of this embodiment includes a test platform 19; a detector 20 for performing dimensional inspection on the automobile chassis is provided on the test platform 19; an X-axis positioner 21 and a Y-axis positioner 22 are distributed on the test platform 19 to locate the position of the automobile chassis; a first bracket 23, a second bracket 24, a third bracket 25, and a fourth bracket 26 are provided on the test platform 19;

[0041] The first bracket 23 is located between the X-direction positioner 21 and the Y-direction positioner 22; the second bracket 24 is located on the Y-direction side of the first bracket 23, the third bracket 25 is located on the X-direction side of the first bracket 23, and the fourth bracket 26 is located diagonally opposite the first bracket 23;

[0042] The first bracket 23, the second bracket 24, the third bracket 25 and the fourth bracket 26 are used to carry the transferred automobile chassis;

[0043] Steel balls for ball positioning are provided on the first bracket 23, the second bracket 24, the third bracket 25 and the fourth bracket 26;

[0044] A fixed steel ball 29 with 6 degrees of freedom is provided in the first bracket 23.

[0045] The second bracket 24 is provided with a rolling steel ball 31 which can rotate with three degrees of freedom around the X axis, Y axis and Z axis;

[0046] The third bracket 25 and the fourth bracket 26 are provided with a rotating steel ball 30 having only one degree of freedom of rotation in the Y axis. The present invention achieves precise positioning through the steel ball. Through the arbitrary rotation of the steel ball itself, when a collision occurs at a certain point, the steel ball rotates to avoid using a smooth surface for positioning. The present invention preferably does not make contact with the first bracket when falling, and makes contact through horizontal pushing. The rotation of the steel ball in the structure of the present invention can absorb vibration and reduce impact. The first bracket is a rotating setting, but the positioning accuracy is poor, but the durability is good.

[0047] The present invention utilizes the principle of a tricycle. The second bracket is similar to the front universal wheel to achieve direction adjustment. The third and fourth brackets are similar to the rear wheels to achieve fine direction adjustment.

[0048] The X-direction positioner 21 and the Y-direction positioner 22 are laser rangefinders, acoustic rangefinders, infrared rangefinders, and the like.

[0049] A fifth bracket 27 is provided on the X-axis of the third bracket 25; a sixth bracket 28 is provided on the X-axis of the fourth bracket 26; the fifth bracket 27 and the sixth bracket 28 have free steel balls 32 that can rotate about the X-axis, Y-axis, and Z-axis, and move in the X-axis and Y-axis with five degrees of freedom. This allows for secondary adjustment. The present invention allows for a primary adjustment of the accuracy using the trolley, a secondary adjustment using the fifth bracket 27 and the sixth bracket 28, and a fine adjustment of the direction using the second, third, and fourth brackets. This allows for adjustment without the trolley having to wait; the trolley can perform other operations and only needs to be used for entry and exit, resulting in high efficiency.

[0050] The vehicle chassis detection method of this embodiment includes the following steps:

[0051] Step 1: First, the car chassis is sent to the steel ball 18 on the top of the carrier by a manipulator or a crane, and the hook of the manipulator or the crane is separated from the car chassis through the carrier process notch 4; then, the car chassis is placed on the steel ball 18 on the top of the carrier, and the upper pulling head 14 of the carrier is driven by the upper push rod 13 of the carrier to move in the vertical guide groove 17 of the carrier, so that the steel ball 18 on the top of the carrier drives the car chassis to rise and separate from the carrier positioning bracket 5; then, based on the two carrier Y-axis positioning seats 7, the detection is carried out by laser, light / acoustic reflection or scale detection. Detect whether the vehicle chassis is tilted; secondly, if deflection occurs, push the vehicle chassis to the right position through the vehicle Y-axis rocker 8; thirdly, use the vehicle Y-axis positioning seat 7 to measure whether the vehicle chassis is in the middle of the vehicle frame 3; then, if it is not in the center, move the vehicle bottom push rod 11 and the vehicle upper push rod 13 to drive the vehicle chassis to move horizontally to the middle; then, pull back the vehicle bottom push rod 11, so that the vertical guide groove 17 of the vehicle upper inclined wedge 16 descends in the vehicle upper pulling head 14, and the vehicle chassis sits on the vehicle positioning support block 5;

[0052] Step 2: First, the AGV 1 delivers the vehicle chassis to the test platform 19, with the vehicle chassis aligned with the centerline of the test platform 19. Then, the AGV 1 drives the carrier frame 3 downward until the vehicle chassis lands above the carrier positioning support block 5. Next, the AGV 1 leaves.

[0053] Step a: First, the vehicle chassis is positioned on the third bracket 25, the fifth bracket 27, the fourth bracket 26, and the sixth bracket 28. Then, the fifth bracket 27, the fourth bracket 26, and the sixth bracket 28 are used to move the vehicle chassis in the Y direction so that the vehicle chassis aligns with the centerline of the test platform 19. Next, the vehicle chassis is pushed in the X direction onto the first bracket 23 and the second bracket 24.

[0054] Step A, detecting whether the vehicle chassis is skewed by the Y-axis positioner 22; if skew occurs, executing step B;

[0055] Step B, using the first bracket 23 as a fulcrum, the second bracket 24 has three degrees of freedom, simulating the principle of a universal wheel, and the third bracket 25 and the fourth bracket 26 have one degree of freedom, simulating the front wheel, to adjust the vehicle chassis;

[0056] Step C: The Y-direction locator 22 and the X-direction locator 21 measure the distance of the vehicle chassis, thereby determining the coordinates of the vehicle chassis;

[0057] In step D, the detector 20 performs detection.

[0058] AGV trolley 1, prefabricated carrier device 2, carrier frame 3, carrier process notch 4, carrier positioning bracket 5, carrier X-axis positioning seat 6, carrier Y-axis positioning seat 7, carrier Y-axis rocker 8, carrier center groove 9, carrier bottom Y-axis inclined wedge 10, carrier bottom push rod 11, carrier bottom transverse guide rail 12, carrier upper push rod 13, carrier upper pulling head 14, carrier inclined guide rail 15, carrier inclined upper inclined wedge 16, carrier vertical guide groove 17, carrier top steel ball 18, test platform 19, detector 20, X-axis locator 21, Y-axis locator 22, first bracket 23, second bracket 24, third bracket 25, fourth bracket 26, fifth bracket 27, sixth bracket 28, fixed steel ball 29, rotating steel ball 30, rolling steel ball 31, free steel ball 32.

[0059] The present invention is fully described for a clearer disclosure, and the prior art is not listed one by one.

[0060] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that the technical solutions described in the above embodiments may be modified or some of the technical features may be replaced with equivalents. It is also obvious for those skilled in the art to combine multiple technical solutions of the present invention. However, such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vehicle chassis detection system, comprising a test platform (19); a detector (20) for performing dimensional detection on the vehicle chassis is provided on the test platform (19); an X-direction positioner (21) and a Y-direction positioner (22) are distributed on the test platform (19) to locate the position of the vehicle chassis; and the system is characterized in that: A first bracket (23), a second bracket (24), a third bracket (25) and a fourth bracket (26) are provided on the test platform (19); The first bracket (23) is located between the X-direction positioner (21) and the Y-direction positioner (22); the second bracket (24) is located on the Y-direction side of the first bracket (23); the third bracket (25) is located on the X-direction side of the first bracket (23); and the fourth bracket (26) is located diagonally opposite to the first bracket (23); The first bracket (23), the second bracket (24), the third bracket (25) and the fourth bracket (26) are used to carry the transferred automobile chassis; Steel balls for ball positioning are provided on the first bracket (23), the second bracket (24), the third bracket (25) and the fourth bracket (26); A fixed steel ball (29) with 6 degrees of freedom is provided in the first bracket (23). A rolling steel ball (31) is provided in the second bracket (24) and can rotate in three degrees of freedom around the X-axis, the Y-axis, and the Z-axis; A rotating steel ball (30) having only one degree of freedom of rotation about the Y axis is provided on the third bracket (25) and the fourth bracket (26); The X-direction locator (21) and the Y-direction locator (22) are laser rangefinders, acoustic rangefinders or infrared rangefinders; A fifth bracket (27) is provided on one side of the third bracket (25) in the X direction; a sixth bracket (28) is provided on one side of the fourth bracket (26) in the X direction; the fifth bracket (27) and the sixth bracket (28) have free steel balls (32) that can rotate around the X axis, the Y axis, and the Z axis and move along the X direction and the Y direction with five degrees of freedom.

2. The automobile chassis detection system according to claim 1, characterized in that: A prefabricated AGV trolley (1) is adapted to the test station (19); a prefabricated carrier device (2) is installed on the AGV trolley (1); The prefabricated carrier device (2) includes a carrier frame (3) mounted on the AGV trolley (1); carrier positioning blocks (5) are respectively provided at four corners above the carrier frame (3) for supporting the automobile chassis; A carrier process notch (4) is provided on the side of the carrier frame (3), and is located above the carrier positioning support block (5) and below the automobile chassis; The carrier frame (3) has a carrier center groove (9) at the center; A carrier X-direction positioning seat (6) is provided in front of the carrier frame (3), at least two carrier Y-direction positioning seats (7) are provided on one side of the carrier frame (3), and a carrier Y-direction swing rod (8) for adjusting the center line of the carrier frame (3) to the X direction is provided on the other side of the carrier frame (3).

3. A vehicle chassis detection method, characterized in that: By means of the automobile chassis detection system according to claim 1, the following steps are included: Step 1: First, the car chassis is sent to the top steel ball (18) of the carrier by a manipulator or a crane, and the hook of the manipulator or the crane is separated from the car chassis through the carrier process notch (4); then, the car chassis is placed on the top steel ball (18) of the carrier, and the upper pulling head (14) of the carrier is driven to move in the vertical guide groove (17) of the carrier by the upper push rod (13) of the carrier, so that the top steel ball (18) of the carrier drives the car chassis to rise and separate from the carrier positioning support block (5); then, based on the two carrier Y-axis positioning seats (7), the car chassis is detected by laser, light / sound reflection or scale detection. Whether the car chassis is tilted; secondly, when it is tilted, the car chassis is pushed straight by the carrier Y-axis rocker (8); thirdly, the car chassis is measured by the carrier Y-axis positioning seat (7) to see whether it is in the middle of the carrier frame (3); then, when it is not in the center, the car chassis is driven to move horizontally to the middle by moving the carrier bottom push rod (11) and the carrier upper push rod (13); later, the carrier bottom push rod (11) is pulled back, so that the carrier vertical guide groove (17) of the carrier tilted upper wedge (16) descends in the carrier upper pulling head (14), and the car chassis sits on the carrier positioning support block (5); Step 2: First, the AGV (1) delivers the vehicle chassis to the test platform (19), with the vehicle chassis corresponding to the center line of the test platform (19); then, the AGV (1) drives the carrier frame (3) to descend until the vehicle chassis falls above the carrier positioning support block (5); secondly, the AGV (1) leaves.

4. A method for detecting an automobile chassis, characterized in that: By means of the automobile chassis detection system according to claim 1, the following steps are included: Step A, detecting whether the vehicle chassis is skewed by the Y-axis positioner (22); if skewness occurs, executing step B; Step B, using the first bracket (23) as a fulcrum, since the second bracket (24) is three degrees of freedom, simulating the principle of a universal wheel, the third bracket (25) and the fourth bracket (26) are one degree of freedom to simulate the front wheel, and the chassis of the vehicle is adjusted; Step C, the Y-direction locator (22) and the X-direction locator (21) measure the distance of the vehicle chassis, thereby determining the coordinates of the vehicle chassis; In step D, the detector (20) performs detection.

5. The automobile chassis detection method according to claim 4, characterized in that: Execute step a before step A. First, the vehicle chassis is placed on the third bracket (25), the fifth bracket (27), the fourth bracket (26) and the sixth bracket (28); then, the fifth bracket (27), the fourth bracket (26) and the sixth bracket (28) are used to move the vehicle chassis along the Y direction so that the vehicle chassis corresponds to the center line of the test platform (19); secondly, the vehicle chassis is pushed along the X direction onto the first bracket (23) and the second bracket (24), and step A is executed.

6. A method for detecting an automobile chassis, characterized in that: With the aid of the automobile chassis detection system according to claim 1; The detection method comprises the following steps: Step 1: First, the car chassis is sent to the top steel ball (18) of the carrier by a manipulator or a crane, and the hook of the manipulator or the crane is separated from the car chassis through the carrier process notch (4); then, the car chassis is placed on the top steel ball (18) of the carrier, and the upper pulling head (14) of the carrier is driven to move in the vertical guide groove (17) of the carrier by the upper push rod (13) of the carrier, so that the top steel ball (18) of the carrier drives the car chassis to rise and separate from the carrier positioning support block (5); then, based on the two carrier Y-axis positioning seats (7), the car chassis is detected by laser, light / sound reflection or scale detection. Whether the car chassis is tilted; secondly, when it is tilted, the car chassis is pushed straight by the carrier Y-axis rocker (8); thirdly, the car chassis is measured by the carrier Y-axis positioning seat (7) to see whether it is in the middle of the carrier frame (3); then, when it is not in the center, the car chassis is driven to move horizontally to the middle by moving the carrier bottom push rod (11) and the carrier upper push rod (13); later, the carrier bottom push rod (11) is pulled back, so that the carrier vertical guide groove (17) of the carrier tilted upper wedge (16) descends in the carrier upper pulling head (14), and the car chassis sits on the carrier positioning support block (5); Step 2: First, the AGV (1) delivers the vehicle chassis to the test platform (19), with the vehicle chassis aligned with the center line of the test platform (19); then, the AGV (1) drives the carrier frame (3) down until the vehicle chassis falls onto the carrier positioning support block (5); secondly, the AGV (1) leaves; Step a: First, the vehicle chassis is placed on the third bracket (25), the fifth bracket (27), the fourth bracket (26) and the sixth bracket (28); then, the fifth bracket (27), the fourth bracket (26) and the sixth bracket (28) are used to move the vehicle chassis along the Y direction so that the vehicle chassis corresponds to the center line of the test platform (19); secondly, the vehicle chassis is pushed along the X direction onto the first bracket (23) and the second bracket (24); Step A, detecting whether the vehicle chassis is skewed by the Y-axis positioner (22); if skewness occurs, executing step B; Step B, using the first bracket (23) as a fulcrum, since the second bracket (24) is three degrees of freedom, simulating the principle of a universal wheel, the third bracket (25) and the fourth bracket (26) are one degree of freedom to simulate the front wheel, and the chassis of the vehicle is adjusted; Step C, the Y-direction locator (22) and the X-direction locator (21) measure the distance of the vehicle chassis, thereby determining the coordinates of the vehicle chassis; In step D, the detector (20) performs detection.

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