A tool for inspecting automotive crash beams

Abstract

This invention relates to a fixture for inspecting automotive crash beams. The automotive crash beam to be inspected includes a main body and an energy-absorbing box. The inspection area is the XZ flatness of the mounting plate at the front end of the energy-absorbing box. The fixture includes a measuring platform, a first positioning mechanism disposed on the measuring platform, a first detection component capable of detecting the curvature of the main body, and a second detection component located below the bottom of the mounting plate. It includes a base for supporting the mounting plate and a measuring part. Spacers are spaced on the top of the base to create a gap between the top of the base and the mounting plate. This gap forms a detection path relative to a reference plane M at the test point, thereby determining whether the XZ flatness of the mounting plate is parallel to the reference plane M. The advantages of this invention are: by setting the first positioning mechanism, the first detection component, and the second detection component on the measuring platform, both the curvature test of the main body and the flatness test of the mounting plate can be satisfied simultaneously, eliminating the need for tooling switching and resulting in high inspection efficiency.

Description

Technical Field

[0001] This invention relates to the field of automotive parts inspection tools, and more specifically to an inspection tool for inspecting automotive anti-collision beams. Background Technology

[0002] A typical automotive crash beam assembly includes crash beams and energy-absorbing boxes. As a component of a car, crash beams include front and rear crash beams, which are installed on the front and rear sides of the vehicle body, respectively. Energy-absorbing boxes are usually installed at both ends of the crash beam. When a car is involved in a collision or impact, the crash beam can distribute the impact force to the energy-absorbing boxes at both ends. The energy-absorbing boxes absorb energy through collapse, thereby protecting the longitudinal beams and the main body structure of the car.

[0003] The structure of the automotive anti-collision beam assembly can be referenced from Chinese utility model patent ZL202021308777.1 (publication number CN213262277U). The disclosed anti-collision system includes an anti-collision beam, an energy-absorbing box, a mounting plate, and a connecting structure. The energy-absorbing boxes at both ends are connected to the anti-collision beam via a boss structure and a connecting structure. The energy-absorbing boxes and the mounting plate are welded together. However, during the welding process of the energy-absorbing boxes and the mounting surface in the aforementioned anti-collision system, the surface of the mounting plate may experience localized deformation due to uneven heating. Since one side of this mounting surface needs to connect to the longitudinal beam, the uneven mounting surface can lead to stress concentration, thereby damaging the internal structure of the vehicle.

[0004] Currently, there are many types of inspection tools used for testing bumper beams in existing technologies. For example, Chinese utility model patent CN221811560U discloses an inspection tool where an arc-shaped support platform on a fixing frame can hold a front bumper beam. Hole detection components are located at the top of the fixing seat near the left and right ends of the fixing component. Detection pins can detect corresponding holes on the front bumper beam. A fixing plate is connected to the upper end of the fixing seat near the back side, and a straightness detection component is located on the front side of the upper end of the fixing plate. A linear laser can detect the straightness of different positions on the bumper beam. Another example is Chinese utility model patent CN222528531U, which also discloses an inspection tool where the bumper beam is mounted on a positioning mechanism. The positioning mechanism is slidably mounted on a guide rail to detect the distance between two crumple zones. Simultaneously, a curvature measuring mechanism is slidably mounted on the positioning mechanism to detect the curvature of the beam. These two types of inspection tools can effectively meet the requirements for testing the curvature, hole diameter, and distance of the bumper beam itself, but they cannot detect the flatness of the energy-absorbing box, a crucial component.

[0005] To meet the above requirements, an additional fixture is needed to check the flatness of the mounting surface of the energy-absorbing box. Those skilled in the art would readily consider using a measuring fixture disclosed in CN211317195U to check the mounting surface. This fixture has a measuring mechanism mounted on its base for measuring the flatness of the object, including a dial indicator. The dial indicator can be adjusted vertically to adaptively adjust the relative distance to the object being measured before flatness detection. However, since the aforementioned fixtures for bending, aperture, and distance testing of the anti-collision beam cannot detect flatness, it is necessary to switch the testing station or perform step-by-step testing based on the existing tooling. This increases the time for testing personnel to assemble the fixture and reduces testing efficiency. Furthermore, the inconsistency of the testing reference surface after switching stations affects the accuracy of the test. In addition, the base, round rod, mounting block, and dial indicator in the fixture are arranged vertically upwards, resulting in a large overall longitudinal space occupied by the fixture. Therefore, further improvements are needed to the structure of the inspection fixture used for testing automotive crash beams. Summary of the Invention

[0006] The first technical problem to be solved by the present invention is to provide a tool for inspecting automotive anti-collision beams that can avoid the low inspection efficiency caused by workstation switching, in order to address the current state of the prior art.

[0007] The second technical problem to be solved by the present invention is to provide a fixture for detecting automotive anti-collision beams that can avoid the impact of changes in the detection reference plane on the accuracy of detection, in light of the above-mentioned existing technology.

[0008] The third technical problem to be solved by the present invention is to provide a small-sized and low-cost inspection tool for testing automotive anti-collision beams, which is particularly capable of meeting the flatness testing requirements of the mounting surface of the energy-absorbing box, in light of the above-mentioned existing technology.

[0009] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is as follows: The inspection fixture for detecting automotive anti-collision beams includes a main body extending along the left-right direction X of the vehicle width and energy-absorbing boxes located at both ends of the main body and extending along the front-rear direction Y simulating the vehicle's movement. The front end of the energy-absorbing box is connected to a mounting plate extending along the Z direction perpendicular to the XY plane. The part to be inspected is the XZ planeness of the mounting plate at the front end of the energy-absorbing box. Correspondingly, the inspection fixture includes:

[0010] Measurement platform;

[0011] A first positioning mechanism, disposed on the measuring platform and corresponding to both ends of the main body, is used to position the vehicle anti-collision beam to be tested, so that the vehicle anti-collision beam to be tested maintains a preset height with the measuring platform; and

[0012] The first detection component, also located on the measurement platform, is used to detect the curvature of the main body;

[0013] Its characteristic is that it also includes:

[0014] The second detection component is disposed on the measurement platform and located below the bottom of the mounting plate. It includes a base for supporting the mounting plate at the front end of the energy-absorbing box to be tested and a measurement unit. At least three pads serving as a reference plane M are spaced apart on the top of the base. The pads create a gap between the top of the base and the mounting plate to be tested. This gap forms a detection path for the detection ends of each measurement unit to perform detection. The distance between the detection points of at least three parts to be tested and the reference plane M is detected through the detection path, thereby determining whether the XZ plane of the mounting plate to be tested is parallel to the reference plane M.

[0015] To address the second technical problem, preferably, at least three measuring units are provided and arranged circumferentially around the periphery of the base. The top of the base has a recessed area along the Y direction corresponding to the position of each measuring unit, and the detection end of each measuring unit enters the detection path by extending into its corresponding recessed area. The purpose of this design is as follows: This application integrates the bending degree of the automotive anti-collision beam and the XZ flatness of the mounting plate into the same fixture. To avoid using the measuring fixture disclosed in CN211317195U in the prior art to inspect the mounting plate, it is necessary to set a corresponding second inspection component on the base to raise the inspection height of the first inspection component in the Y direction. This inevitably leads to a decrease in inspection accuracy due to excessive height. Therefore, the applicant cleverly solves this problem by setting a recessed area along the Y direction on the base. On the one hand, it does not change the inspection height of the first inspection component, and on the other hand, it does not require tooling switching. The corresponding measuring part is directly set on the circumferential direction of the base to convert the Y-direction measurement arrangement to the circumferential, i.e., XZ-direction arrangement. In this way, the inspection ends of each measuring part can extend into the corresponding recessed area and inspect the bottom of the mounting plate. During the inspection process, the automotive anti-collision beam to be inspected maintains the same inspection position, avoiding the impact on the inspection accuracy caused by the inconsistency of the inspection reference surface after switching positions.

[0016] For ease of measurement, preferably, the detection end of the measuring unit extends into its corresponding recessed area via a damping rod to enter the detection path. The measuring unit is a lever dial indicator or a lever micrometer indicator. The detection end is located at the end of the damping rod, which converts the minute linear displacement of the detection end into rotation of the pointer on the dial, thus facilitating the reading of values ​​and the assessment of the flatness of the mounting plate's bottom surface.

[0017] To address the third technical problem, preferably, the second detection assembly further includes a first support for rotatably connecting the damping rod and a second support for supporting the lever dial indicator or lever percentage indicator. The first support has a through hole for the damping rod to pass through, providing a stable fulcrum for its rotation. The second support serves as a base for mounting the lever dial indicator or lever percentage indicator, ensuring the stability of its measurement reference. By placing both the first and second supports outside the base, excessive space occupied by the entire fixture in the Y direction due to the height of the supports is avoided.

[0018] To facilitate the fixing of the car crash beam to be tested, preferably, the measuring platform is also equipped with a clamping mechanism. This clamping mechanism includes clamping heads that apply pressure to the top surface of the mounting plate of the car crash beam to be tested. Each clamping head is connected to its own linkage mechanism, and a wrench is connected to the end of the linkage mechanism. During the bending test of the main body and the flatness test of the mounting plate, the stability of the car crash beam to be tested must be ensured. Pressing down the wrench locks the clamping mechanism, causing the clamping heads on the linkage mechanism to apply pressure to the top surface of the mounting plate, thereby fixing the car crash beam to be tested. Raising the wrench unlocks the clamping mechanism and removes the clamping heads from the top surface of the mounting plate.

[0019] To achieve precise installation and improve stability, the mounting plate at the front end of the energy-absorbing box of the automotive anti-collision beam to be tested has at least two first mounting holes along the circumferential direction for installation with the vehicle body. Within the inner circumference enclosed by each of the first mounting holes, there are first and second protrusions extending in the Y direction at intervals. The first and second protrusions together constitute the socket of the energy-absorbing box. At least two second mounting holes for installation with the vehicle body are also provided on the side wall of the energy-absorbing box. The peripheral wall of the main body forms a cavity, within which a partition abuts against the peripheral wall. The two ends of the main body extend outwards in the X direction from the location of the energy-absorbing box, and are partially notched so that the corresponding partitions partially constitute mounting portions for installation with the vehicle body. The mounting plate features a first mounting hole that not only secures the device to the vehicle body in practical applications but also allows for positioning and detection with external tools during testing. The mounting plate also includes a socket formed by a first and second protrusion, enhancing the stability of the energy-absorbing box in the Y direction. This detailed design further ensures that the mounting plate maintains the required XZ plane even when the first and second protrusions are welded to the sidewalls of the energy-absorbing box. Additionally, a second mounting hole on the sidewalls of the energy-absorbing box further improves stability by engaging with a positioning mechanism on the measuring platform. Furthermore, notches at both ends of the main body prevent interference between the main body and the exterior trim panels of the vehicle interior, allowing the partition to partially form a mounting portion for installation with the vehicle body. These notches also facilitate the positioning mechanism's insertion for positioning at both ends of the main body during testing.

[0020] Furthermore, the base is provided with a positioning hole that mates with the first mounting hole used for positioning, and a detection hole that mates with the first mounting hole used for detection. The base is also provided with a positioning pin that can be inserted into the positioning hole and a detection pin that can be inserted into the detection hole. The positioning pin can pass through both the positioning hole and the corresponding first mounting hole simultaneously to fix the mounting plate on the base. When the detection pin can pass through both the detection hole and the corresponding first mounting hole simultaneously, it indicates that the mounting plate is accurately positioned on the base.

[0021] To maintain stability in the Y direction, preferably, the measuring platform is provided with a second positioning mechanism for holding the energy-absorbing box within the socket formed by the first and second protrusions. The second positioning mechanism includes a first base, a first vertical rod, and a first positioning part for abutting against the side wall of the energy-absorbing box on the measuring platform. The first vertical rod extends from the first base along the Y direction, while the first positioning part is located on the inner side of the first vertical rod and extends along the Z direction. A first fastener is provided on the first positioning part to engage with and fix it in place with the second mounting hole. Since the energy-absorbing box has a certain height, the vehicle crash beam under test is prone to instability in the Y direction during testing. By abutting against the side wall of the energy-absorbing box and simultaneously inserting the first fastener into the second mounting hole, the first positioning part prevents the vehicle crash beam under test from tilting or swaying during testing, thus improving stability in the Y direction.

[0022] To maintain stability at both ends of the main body, preferably, each end of the main body is provided with a third positioning mechanism for positioning on the mounting part. Each third positioning mechanism includes a second base, a second vertical rod, and a second positioning part for abutting against the mounting part, all disposed on the measuring platform. The second vertical rod extends from the second base along the Y direction, and the second positioning part includes positioning feet disposed on the inner side of the second vertical rod and extending along the X direction to abut against the separator. At least two positioning feet are spaced apart along the Z direction. The second vertical rod is also provided with an adjusting member that can synchronously adjust the relative distance between the second vertical rod and each positioning foot. Since the main body is relatively long, it is difficult to guarantee stability in the X direction. By abutting the positioning feet on the second positioning part against the separator of the main body, the stability of the main body is enhanced, and the adjusting member can adjust the position of the second vertical rod and the second positioning part according to the length of the main body, thereby adapting to the positioning requirements of main bodies of different lengths.

[0023] To facilitate bending degree detection, preferably, the first positioning mechanism includes pillars spaced apart on the measuring platform. Each pillar is equipped with a second fastener for securing the main body of the vehicle anti-collision beam to be tested in the Y direction. The top of each pillar has a groove for at least partial embedment of the main body. A detection gap is provided between the bottom of the groove and the main body, allowing the first detection component to extend into and detect bending degree. The first detection component includes at least two go / no-go gauges of different diameters. The main body is fixed to the groove of the pillar by the second fastener, further ensuring the stability of the main body. The detection gap between the bottom of the groove and the main body allows go / no-go gauges of different diameters to perform bending degree detection. This detection method is fast and can adapt well to production cycles.

[0024] Compared with the prior art, the advantages of the present invention are as follows:

[0025] 1. By integrating a first positioning mechanism, a first detection component, and a second detection component into the measuring platform, the vehicle anti-collision beam to be inspected can be positioned and kept at a preset height with the measuring platform. The first detection component can test the curvature of the main body, and the second detection component can test the XZ flatness of the mounting plate at the front end of the energy-absorbing box. This fixture simultaneously satisfies the curvature test of the main body and the flatness test of the mounting plate, eliminating the tooling switching step and achieving high inspection efficiency.

[0026] 2. The second detection component utilizes at least three pads. On the one hand, it can transfer the reference of the reference plane from the base to the pads. These pads not only avoid timely replacement due to wear and tear, thus improving the measurement accuracy of the reference plane, but also prevent the inaccuracy of the reference plane due to oil stains easily adhering to the base.

[0027] 3. The height of the pad creates a gap between the top of the base and the bottom of the mounting plate, cleverly providing the second detection component with corresponding measurement space, thereby determining whether the XZ plane of the mounting plate is parallel to the reference plane M. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the car anti-collision beam to be tested in an embodiment of the present invention;

[0029] Figure 2 This is an exploded view of the car anti-collision beam to be tested in an embodiment of the present invention;

[0030] Figure 3 A three-dimensional structural schematic diagram of the inspection fixture in an embodiment of the present invention;

[0031] Figure 4 A schematic diagram illustrating the interaction between the inspection tool and the mounting plate in the vehicle anti-collision beam to be inspected in this embodiment of the invention;

[0032] Figure 5 This is a schematic diagram illustrating the interaction between the inspection tool and the vehicle anti-collision beam to be inspected in an embodiment of the present invention.

[0033] Figure 6 for Figure 5 A partial longitudinal sectional view (showing the mounting position of the detection pin mounting plate on the base);

[0034] Figure 7 This is an exploded view of the base, mounting plate, energy-absorbing box, positioning pin, and detection pin in an embodiment of the present invention;

[0035] Figure 8 for Figure 5 A schematic diagram of the three-dimensional structure from another direction;

[0036] Figure 9 for Figure 5 The front view;

[0037] Figure 10 for Figure 5 Top view;

[0038] Figure 11 for Figure 5 Another partial longitudinal sectional view (showing the mounting gap between the groove and the body).

[0039] In the diagram: 1. Measuring platform; 2. First positioning mechanism; 21. Support column; 211. Groove; 22. Second fastener; 3. First detection component; 4. Second detection component; 41. Measuring section; 411. Detection end; 42. First support; 43. Second support; 44. Damping rod; 5. Base; 51. Recessed area; 52. Positioning hole; 53. Detection hole; 6. Pad; 7. Clamping mechanism; 71. Clamping head; 72. Linkage mechanism; 73. Wrench; 8. Positioning pin; 9. Detection pin; 10. Second positioning mechanism; 101. First base; 102. First vertical... 103. Rod; 104. First positioning part; 105. First fastener; 11. Third positioning mechanism; 116. Second base; 117. Second vertical rod; 118. Second positioning part; 119. Positioning clip; 1100. Adjusting part; 12. Detection gap; 13. Gap; A. Car anti-collision beam to be tested; A1. Main body; A11. Notch; A12. Separator; A121. Mounting part; A2. Energy absorption box; A21. Second mounting hole; A3. Mounting plate; A31. First mounting hole; A32. First protrusion; A33. Second protrusion; M. Reference plane. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0041] like Figures 1 to 11 The diagram shows the preferred embodiment of the present invention. (See reference...) Figure 1 and Figure 2 In this embodiment, the car anti-collision beam A to be tested includes a main body A1 extending along the left-right direction X of the vehicle width and energy-absorbing boxes A2 located at both ends of the main body A1 and extending along the front-rear direction Y simulating the movement of the vehicle body. The front end of the energy-absorbing box A2 is connected to a mounting plate A3 extending along the Z direction perpendicular to the XY plane. The parts to be tested are the XZ planeness of the mounting plate A3 at the front end of the energy-absorbing box A2 and the curvature of the main body A1. The mounting plate A3 is provided with three first mounting holes A31 along the circumference for mounting to the vehicle body. The first mounting holes A31 can be used by positioning pins 8 and detection pins 9 to fix and detect the mounting plate A3 respectively (see reference). Figure 6 and Figure 7The inner perimeter of the mounting plate A3 is provided with a first protrusion A32 and a second protrusion A33 protruding along the Y direction. The first protrusion A32 and the second protrusion A33 together form the socket of the energy-absorbing box A2. The energy-absorbing box A2 is welded and fixed to the first protrusion A32 and the second protrusion A33 to improve the stability in the Y direction, and at the same time, it can keep the mounting plate A3 at the required XZ flatness. The side wall of the energy-absorbing box A2 is provided with two second mounting holes A21 for mounting to the vehicle body, which can be connected to the positioning machine on the measuring platform 1. The structure is designed to further improve stability. The periphery of the main body A1 forms a cavity, and a partition A12 that abuts against the periphery is provided in the cavity. The two ends of the main body A1 continue to extend outward in the X direction from the location of the energy-absorbing box A2, and are partially provided with notches A11. This can prevent the main body A1 from interfering with the exterior trim panel inside the car in practical applications, so that the partition A12 partially constitutes a mounting part A121 for installation with the car body. At the same time, it can also facilitate the positioning mechanism to extend into and position the two ends of the main body A1 during the testing process.

[0042] To simultaneously meet the requirements for XZ flatness and A1 curvature testing of the main body, refer to Figures 3 to 5 The inspection fixture in this embodiment includes a measuring platform 1, a first positioning mechanism 2, a first detection component 3, and a second detection component 4. The first positioning mechanism 2 is disposed on the measuring platform 1 and can fix both ends of the main body A1. The first positioning mechanism 2 ensures that the car anti-collision beam A to be inspected maintains a preset height with the measuring platform 1. The first detection component 3 is also disposed on the measuring platform 1 and can detect the curvature of the main body A1. The second detection component 4 is also disposed on the measuring platform 1 and located below the bottom of the mounting plate A3. It includes a base 5 for placing the mounting plate A3 and a measuring part 41 for testing flatness (see reference). Figure 6 The top of the base 5 has three spaced pads 6 (see reference). Figure 7 The pad 6 has the following functions: First, since the measuring platform 1 may become uneven due to dirt during use, the pad 6 can be used to adjust the reference plane M (refer to...). Figure 7 Second, the pad 6 creates a gap 13 between the top of the base 5 and the mounting plate A3 to be tested (see reference). Figure 4 and Figure 6 The gap 13 forms a detection path for the detection end 411 of each measuring part 41 to perform detection. The operator can use the detection path to test the distance of the detection point of the part to be tested relative to the reference plane M, thereby judging whether the XZ plane of the mounting plate A3 to be tested is parallel to the reference plane M.

[0043] refer to Figure 7 and Figure 10In this embodiment, four measuring units 41 are arranged circumferentially around the base 5. A recessed area 51, partially downwardly recessed, is provided on the top of the base 5 corresponding to the position of each measuring unit 41. The detection end 411 of each measuring unit 41 enters the detection path by extending into its corresponding recessed area 51. The structure of this recessed area 51 in this embodiment has the following advantages: First, it allows for the detection height of the first detection component 3 to remain unchanged; second, it eliminates the need for tooling switching, allowing the corresponding measuring units 41 to be directly set circumferentially on the base 5, thus converting the Y-axis measurement arrangement to a circumferential (XZ) arrangement. This allows the detection end 411 of each measuring unit 41 to extend into its corresponding recessed area 51 and detect the bottom of the mounting plate A3. During the detection process, the vehicle anti-collision beam A to be detected maintains the same detection position, avoiding inconsistencies in the detection reference surface caused by switching positions, which could affect the accuracy of the detection. The measuring unit 41 can be a lever dial indicator or a lever micrometer, for reference... Figure 6 In this embodiment, a lever dial indicator with high measurement accuracy is preferred. The detection end 411 of the measuring part 41 extends into the corresponding recessed area 51 through the damping rod 44 and enters the detection path. The damping rod 44 can convert the small linear displacement of the detection end 411 into the rotation of the pointer on the dial, so as to facilitate reading the value and judging the flatness of the bottom surface of the mounting plate A3.

[0044] Considering that some existing fixtures used for flatness inspection have a large height in the Y direction, thus increasing their space occupation, reference Figure 6 and Figure 8 In this embodiment, the second detection component 4 further includes a first support 42 and a second support 43 disposed on the measuring platform 1. The first support 42 has a through hole for the damping rod 44 to pass through, which can provide a stable rotation fulcrum for the damping rod 44. The second support 43 is a base for mounting a lever dial indicator, which can ensure the stability of the lever dial indicator or lever micrometer measurement reference. By moving the first support 42 and the second support 43 outside the base 5, the overall space occupied by the inspection fixture in the Y direction due to the height of the support can be avoided. In order to ensure the accuracy of the measurement results, the car anti-collision beam A to be inspected needs to be fixed to maintain stability. (Refer to...) Figures 3 to 5 as well as Figure 8 In this embodiment, a clamping mechanism 7 for fixing the mounting plate A3 is provided on the measuring platform 1. The clamping mechanism 7 includes a clamping head 71 that can apply pressure to the top surface of the mounting plate A3. The clamping mechanism 7 can be locked by pressing down the wrench 73, so that the clamping head 71 on the linkage mechanism 72 applies pressure to the top surface of the mounting plate A3, thereby fixing the car anti-collision beam A to be tested. The clamping mechanism 7 can be unlocked by raising the wrench 73, and the clamping head 71 can be moved out from the top surface of the mounting plate A3.

[0045] Furthermore, since the energy-absorbing box A2 has a certain height, the car anti-collision beam A to be tested is prone to instability in the Y direction during the testing process. In this embodiment, a second positioning mechanism 10 is also provided on the measuring platform 1 to hold the energy-absorbing box A2 in the socket formed by the first protrusion A32 and the second protrusion A33 (see reference). Figure 2 and Figure 5 The second positioning mechanism 10 includes a first base 101, a first vertical rod 102, and a first positioning part 103. The first vertical rod 102 extends from the first base 101 along the Y direction, and the first positioning part 103 is disposed on the inner side of the first vertical rod 102 and extends along the Z direction. It can abut against the side wall of the energy-absorbing box A2. The side wall of the energy-absorbing box A2 is provided with a second mounting hole A21. The first fastener 104 is inserted into the second mounting hole A21, thereby making the car anti-collision beam A to be tested stable in the Y direction, thus ensuring the accuracy of the test results.

[0046] Meanwhile, since the main body A1 is quite long, it is difficult to guarantee stability in the X direction. Therefore, this embodiment provides a third positioning mechanism 11 at both ends of the main body A1 to enhance its stability (see reference). Figure 5 , Figure 6 and Figure 9 The third positioning mechanism 11 includes a second base 111, a second vertical rod 112, and a second positioning part 113 for abutting against the mounting part A121, all mounted on the measuring platform 1. The second vertical rod 112 extends from the second base 111 along the Y direction. The second positioning part 113 includes two positioning feet 1131 spaced apart on the inner side of the second vertical rod 112 and extending along the X direction to abut against the separator A12. The adjusting member 114 on the second vertical rod 112 can adjust the position of the second vertical rod 112 and the second positioning part 113 according to the length of the main body A1, thereby adapting to the positioning requirements of main bodies A1 of different lengths.

[0047] refer to Figure 6 and Figure 7 The base 5 is provided with a positioning hole 52 and two detection holes 53 at intervals. By passing the positioning pin 8 through the positioning hole 52 and one of the first mounting holes A31, the energy absorption box A2 and the mounting plate A3 can be positioned on the base 5. The detection pin 9 is used to detect the accuracy of the positioning. When the detection pin 9 can pass through the detection hole 53 and the corresponding first mounting hole A31 at the same time, the installation position of the energy absorption box A2 and the mounting plate A3 is accurate, and subsequent bending and flatness tests can be performed.

[0048] For ease of curvature detection, refer to Figures 8 to 11The first positioning mechanism 2 includes support columns 21 spaced apart on the measuring platform 1. Each support column 21 is connected to the main body A1 by a second fastener 22. The main body A1 is fixed to the support columns 21 by the second fasteners 22, thereby further ensuring the stability of the main body A1. The top of each support column 21 is provided with a groove 211 for partial insertion into the main body A1 (see reference). Figure 8 A detection gap 12 is reserved between the bottom of the groove 211 and the main body A1, allowing the first detection component 3 to extend into and detect the curvature (see reference). Figure 9 and Figure 11 The detection gap 12 can be used to inspect go and no-go gauges of different diameters. This detection method is fast and can adapt well to the production cycle.

[0049] The working steps of the inspection tool in this embodiment are as follows:

[0050] 1. Place the car anti-collision beam A to be tested in the designated position. The first positioning mechanism 2, the second positioning mechanism 10, and the third positioning mechanism 11 fix the main body A1, the two ends of the main body A1, and the energy absorption box A2 respectively. At the same time, the pressing mechanism 7 presses and fixes the mounting plate A3.

[0051] 2. Bending test: Select a go / no-go gauge with a smaller diameter and insert it into the installation gap 12. If it passes, it is qualified; if it fails, it indicates that the bending of the main body A1 is too large. Then select a go / no-go gauge with a larger diameter and insert it into the installation gap 12. If it fails, it is qualified; if it passes, it indicates that the bending of the main body A1 is too small.

[0052] 3. Flatness test: Insert each detection end 411 into the recessed area 51 along the detection path and test the distance of the corresponding detection point on the bottom of the mounting plate A3 relative to the reference plane M, so as to determine whether the XZ plane of the mounting plate A3 to be tested is parallel to the reference plane M.

Claims

1. A fixture for inspecting automotive anti-collision beams, wherein the automotive anti-collision beam (A) to be inspected includes a main body (A1) extending along the left-right direction (X) of the vehicle width and energy-absorbing boxes (A2) located at both ends of the main body (A1) and extending along the front-rear direction (Y) simulating the movement of the vehicle body. The front end of the energy-absorbing box (A2) is connected to a mounting plate (A3) extending along the Z direction perpendicular to the XY plane. The part to be inspected is the XZ planeness of the mounting plate (A3) at the front end of the energy-absorbing box (A2). Correspondingly, the fixture includes: Measurement platform (1); A first positioning mechanism (2), located on the measuring platform (1) and corresponding to both ends of the main body (A1), is used to position the vehicle anti-collision beam (A) to be tested, so that the vehicle anti-collision beam (A) to be tested maintains a preset height with the measuring platform (1); and The first detection component (3) is also located on the measurement platform (1) and is used to detect the curvature of the main body (A1); Its features are: It also includes: The second detection component (4) is set on the measurement platform (1) and located below the bottom of the mounting plate (A3). It includes a base (5) for placing the mounting plate (A3) at the front end of the energy-absorbing box (A2) to be tested, and a measuring part (41). At least three pads (6) serving as reference planes (M) are spaced apart on the top of the base (5). By means of each pad (6), a gap (13) is left between the top of the base (5) and the mounting plate (A3) to be tested. This gap (13) constitutes a detection path for the detection end (411) of each measuring part (41) to perform detection. The distance between the detection points of at least three parts to be tested and the reference plane (M) is detected through the detection path, thereby determining whether the XZ flatness of the mounting plate (A3) to be tested is parallel to the reference plane (M).

2. The inspection fixture according to claim 1, characterized in that: At least three measuring units (41) are provided and are arranged circumferentially around the periphery of the base (5). The top of the base (5) is provided with a recessed area (51) that is partially recessed downwards corresponding to the position of each measuring unit (41). The detection end (411) of each measuring unit (41) enters the detection path by extending into its corresponding recessed area (51).

3. The inspection fixture according to claim 2, characterized in that: The detection end (411) of the measuring unit (41) extends into the corresponding recessed area (51) through the damping rotating rod (44) and enters the detection path. The measuring unit (41) is a lever dial indicator or a lever micrometer.

4. The inspection fixture according to claim 3, characterized in that: The second detection component (4) also includes a first support (42) for rotatably connecting the damping rod (44) and a second support (43) for supporting the lever dial indicator or lever micrometer.

5. The inspection fixture according to any one of claims 1 to 4, characterized in that: The measuring platform (1) is also provided with a clamping mechanism (7), which includes a clamping head (71) that can apply pressure to the top surface of the mounting plate (A3) of the car anti-collision beam (A) to be tested. Each clamping head (71) is connected to its own linkage mechanism (72), and a wrench (73) is connected to the end of the linkage mechanism (72).

6. The inspection fixture according to claim 1, characterized in that: The energy-absorbing box (A2) of the vehicle anti-collision beam (A) to be tested has at least two first mounting holes (A31) circumferentially arranged on the mounting plate (A3) at the front end for mounting to the vehicle body. Within the inner perimeter formed by each of the first mounting holes (A31), there are spaced first protrusions (A32) and second protrusions (A33) protruding in the Y direction. The first protrusions (A32) and second protrusions (A33) together constitute the socket of the energy-absorbing box (A2). At least two second mounting holes (A21) for mounting to the vehicle body are also provided on the side wall of A2. The peripheral wall of the main body (A1) forms a cavity, and a partition (A12) abutting against the peripheral wall is provided in the cavity. The two ends of the main body (A1) continue to extend outward in the X direction at the location of the energy absorption box (A2), and are partially provided with notches (A11) so that the corresponding partition (A12) partially constitutes a mounting part (A121) for mounting to the vehicle body.

7. The inspection fixture according to claim 6, characterized in that: The base (5) is provided with a positioning hole (52) that mates with a first mounting hole (A31) used for positioning, and a detection hole (53) that mates with a first mounting hole (A31) used for detection. The base (5) is also provided with a positioning pin (8) that can be inserted into the positioning hole (52) and a detection pin (9) that can be inserted into the detection hole (53).

8. The inspection fixture according to claim 6, characterized in that: The measuring platform (1) is provided with a second positioning mechanism (10) for holding the energy-absorbing box (A2) in the socket formed by the first protrusion (A32) and the second protrusion (A33). The second positioning mechanism (10) includes a first base (101), a first vertical rod (102) and a first positioning part (103) for abutting against the side wall of the energy-absorbing box (A2) on the measuring platform (1). The first vertical rod (102) extends from the first base (101) in the Y direction, and the first positioning part (103) is provided on the inner side of the first vertical rod (102) and extends in the Z direction. A first fastener (104) is provided on the first positioning part (103) for fixing in conjunction with the second mounting hole (A21).

9. The inspection fixture according to claim 6, characterized in that: The main body (A1) is provided with a third positioning mechanism (11) at each end for positioning on the mounting part (A121). Each third positioning mechanism (11) includes a second base (111), a second vertical rod (112), and a second positioning part (113) for abutting against the mounting part (A121) on the measuring platform (1). The second vertical rod (112) extends from the second base (111) along the Y direction. The second positioning part (113) includes a positioning latch (1131) provided on the inner side of the second vertical rod (112) and extending along the X direction to abut against the separator (A12). At least two positioning latches (1131) are provided at intervals along the Z direction. The second vertical rod (112) is also provided with an adjusting member (114) that can synchronously adjust the relative distance between the second vertical rod (112) and each positioning latch (1131).

10. The inspection fixture according to any one of claims 1 to 9, characterized in that: The first positioning mechanism (2) includes support columns (21) spaced apart on the measuring platform (1). Each support column (21) is provided with a second fastener (22) for fastening the main body (A1) of the car anti-collision beam (A) to be tested in the Y direction. The top of the support column (21) is provided with a groove (211) into which the main body (A1) can be at least partially embedded. A detection gap (12) is reserved between the bottom of the groove (211) and the main body (A1) for the first detection component (3) to extend into and detect the curvature. The first detection component (3) includes at least two go and no-go gauges of different diameters.

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