A new symmetry detection mechanism

Abstract

The utility model discloses a novel symmetry detection mechanism, include: bottom plate, two symmetrical detection devices of setting on bottom plate and set up on bottom plate torsional beam mounting assembly, detection device is equipped with two for with bushing self -adaptation and fit detection spare one end to torsional beam mounting assembly, detection spare includes being equipped with two parallel end faces detection block of before and after, mounting seat and first rod, one end of first rod is connected with the one end face of detection block, and first rod and the end face of detection block are perpendicular to set up, the other end of first rod is equipped with steering ball head, is equipped with the ball socket of being suitable for steering ball head embedding installation on mounting seat, and the end face of detection block and first rod connection is spaced apart and is arranged between mounting seat. The utility model has solved the technical problem of the low detection precision caused by the fact that the detection block in the existing symmetry detection mechanism cannot completely fit the bushing, and has reached the technical effect of improving the detection precision.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, specifically to a novel symmetry testing mechanism. Background Technology

[0002] In the automotive manufacturing industry, the rear suspension torsion beam is a key chassis component, and the symmetry of its two sleeve end faces directly affects assembly accuracy and the vehicle's handling stability. Existing rear suspension torsion beams consist of a crossbeam and two trailing arms. The two trailing arms are connected to both ends of the crossbeam and are symmetrically distributed. The rear end of the trailing arms connects to the wheel, and the front end of the trailing arms has a sleeve connecting to the thrust rod. To ensure the product quality of the rear suspension torsion beam, high-precision testing of its symmetry is necessary.

[0003] Existing testing mechanisms assess the symmetry accuracy of the entire torsion beam by measuring the symmetry accuracy of the two sleeves. These mechanisms consist of two testing devices, a fixing component, and a reference component. During testing, the torsion beam is first placed in the testing station and positioned using the reference component. Then, the fixing component clamps and secures the torsion beam. Finally, the testing devices are activated to detect symmetry. Each testing device is equipped with two testing blocks that can move in opposite directions and a displacement sensor to provide feedback on the block displacement data. During testing, both testing blocks simultaneously approach the sleeve and come into contact with its two end faces. However, because the direction of movement of the testing blocks is fixed, when there is an angular deviation between the direction of movement and the sleeve axis, the end faces of the testing blocks cannot completely contact the end faces of the sleeves. This results in a situation where, during testing, one testing device's testing block is in contact with the sleeve, while the other's is not, yet both displacement sensors provide the same data, ultimately affecting the accuracy of the symmetry data.

[0004] In summary, existing testing institutions suffer from the problem that the testing block cannot fully fit the sleeve, resulting in low accuracy of the testing data. There is an urgent need to design a symmetrical testing institution that can fully fit the sleeve and provide high accuracy of the testing data. Utility Model Content

[0005] This application provides a novel symmetry detection mechanism to solve the technical problem that the detection block cannot fully fit the sleeve in existing symmetry detection mechanisms, resulting in low detection accuracy.

[0006] This application provides a novel symmetry detection mechanism, comprising: a base plate, a detection device symmetrically arranged on the base plate along the axis of symmetry of two opposing torsion beams, and a torsion beam mounting assembly mounted on the base plate; the detection device has two detection elements arranged opposite each other on the left and right and used for adaptive fitting with a sleeve at one end facing the torsion beam mounting assembly; the detection elements include a detection block with two parallel end faces, a mounting base with a mounting seat, and a first rod, one end of the first rod being connected to one end face of the detection block and the first rod being perpendicular to the end face of the detection block, the other end of the first rod having a steering ball head, and the mounting base having a ball socket suitable for embedding the steering ball head, the end face of the detection block connected to the first rod being spaced apart from the mounting base; the detection device also includes a drive assembly for driving the two detection elements to move towards or away from each other, and a displacement sensor for feeding back the movement data of the detection elements.

[0007] Based on the above technical solution, an adaptive detection component is set in the detection device. The detection component adopts a combination structure of detection block, mounting base and first rod with steering ball head. The steering ball head is embedded in the ball socket of the mounting base to form a universal connection, which allows the detection block to achieve multi-degree-of-freedom fine adjustment when subjected to the force of the sleeve end face. This enables the detection component to automatically adjust its position and angle according to the actual posture of the sleeve, thereby ensuring that the end faces of the two detection components are completely in contact with the two end faces of the sleeve. This effectively solves the problem of poor contact caused by the deviation between the sleeve axis and the movement direction of the detection block in traditional detection equipment, and significantly improves the accuracy of symmetry detection data.

[0008] Preferably, the mounting base is provided with multiple first grooves spaced apart around the ball socket, and each first groove is fitted with a ball plunger. The ball ends of all ball plungers are in zero-preload contact with the end face of the detection block connected to the first rod.

[0009] Based on the above technical solution, multiple first grooves with embedded ball-head plungers are arranged around the ball socket on the mounting base, and the ball head end of all ball-head plungers maintains zero preload contact with the end face of the detection block. That is, the ball head end fits against the surface of the detection block without applying additional constraint force, so that it moves flexibly and responds sensitively during the adaptive adjustment process. At the same time, it avoids the detection results from being affected by over-positioning or frictional resistance, thereby ensuring high sensitivity and high reliability of the detection process.

[0010] Preferably, the detection device includes a fixed seat fixed to the base plate and a movable seat slidably connected to the fixed seat via a slide rail. The drive assembly includes two vertically parallel guide rails, a telescopic cylinder fixed to the movable seat, a gear, and two racks meshing with the gear and arranged parallel to the guide rails. The two ends of each mounting seat are slidably connected to the two guide rails respectively. The gear is fixed between the two guide rails. The two racks are fixedly connected to one mounting seat and slidably engaged with the other mounting seat respectively. The drive end of the telescopic cylinder is connected to one mounting seat, and the extension and retraction direction of the drive end is parallel to the rack.

[0011] Based on the above technical solution, the detection device adopts a combination of a fixed seat and a slidingly connected movable seat, and drives the gear and rack mechanism through a telescopic cylinder to move the two mounting seats toward or away from each other. This structure not only realizes that the two detection parts can clamp or release the sleeve synchronously and smoothly, but also ensures high repeatability and positioning accuracy of the detection action, effectively improving the automation level and operation efficiency of the entire detection process.

[0012] Preferably, the testing device further includes a calibration component located between the two testing blocks for calibration. The calibration component is rotatably connected to the fixed base, and the calibration component has two parallel end faces, which are arranged parallel to the mounting base.

[0013] Based on the above technical solution, a calibration component is set on the fixed base. The end face of the calibration component is parallel to the end face of the mounting base facing the test block. The position and orientation of the test piece can be quickly calibrated before each test, eliminating systematic errors caused by long-term use or environmental factors. This maintains the long-term stability and measurement consistency of the testing mechanism and further enhances the reliability of the test results.

[0014] Preferably, the fixed base is provided with a bracket, the upper end surface of the bracket is provided with a connector for flipping up and down and a second groove suitable for the connector to be embedded, one end of the connector is rotatably connected to the end of the second groove away from the movable base, and the other end of the connector is connected to the upper end of the calibration part.

[0015] Based on the above technical solution, the calibration part is installed by a flip-out connector and the second slot on the bracket. This allows the calibration part to be flipped upwards to avoid interfering with the clamping and testing process of the torsion beam when it is not being calibrated. When calibration is required, it can be quickly reset to the working position, thus balancing calibration function and ease of operation, and improving the space utilization and human-machine interaction efficiency of the whole machine.

[0016] Preferably, the torsion beam mounting assembly further includes a lifting assembly, which includes a first plate, a driving device disposed on the base plate for driving the first plate to rise and fall, and a limiting assembly disposed on the upper end surface of the first plate for supporting the torsion beam. When the first plate is in a raised state, the limiting assembly supports the torsion beam. When the first plate is in a lowered state, the limiting assembly disengages from the torsion beam, and the reference assembly supports the torsion beam.

[0017] Based on the above technical solution, the lifting assembly controls the lifting state of the first plate through the drive device, so that when it is lifted, the limit assembly provides initial support for the torsion beam, and when it is lowered, the reference assembly supports the torsion beam. This avoids the collision problem between the torsion beam and the detection block in the traditional clamping method, avoids the detection block calibration failure caused by improper clamping, and further improves the reliability of the detection data.

[0018] Preferably, the limiting component includes a pair of first limiting members, both of which are disposed on the first plate in the area corresponding to the torsion beam crossbeam, and the two first limiting members are symmetrically distributed with respect to the axis of symmetry between the two detection devices.

[0019] Based on the above technical solution, the limiting component includes two first limiting members corresponding to the crossbeam area of ​​the torsion beam. The supporting crossbeam provides initial support for the torsion beam, ensuring that the torsion beam will not deflect to the left or right during the lifting process, avoiding collisions between the torsion beam and the detection block, thereby improving the clamping efficiency of the torsion beam.

[0020] Preferably, the limiting component further includes a pair of second limiting members, which are symmetrically distributed with respect to the axis of symmetry between the two detection devices, and are respectively located on the first plate in the areas corresponding to the two longitudinal arms of the torsion beam.

[0021] Based on the above technical solution, two second limiting components are set to support the two longitudinal arms of the torsion beam respectively, so as to avoid the torsion beam from flipping up and down during the lifting process, and to make the torsion beam make smooth contact with the reference component when it descends, thereby further improving the clamping efficiency of the torsion beam.

[0022] One or more technical solutions provided in this application have at least the following technical effects or advantages: 1. The detection device is equipped with adaptive detection components and drive components, which enable the detection components to automatically adjust their position and angle according to the actual posture of the sleeve, thereby ensuring that the end faces of the two detection components are fully fitted with the two end faces of the sleeve. This effectively solves the problem of poor fit caused by the deviation between the sleeve axis and the moving direction of the insertion block in traditional detection equipment, and significantly improves the accuracy and repeatability of symmetry detection data. 2. A calibration component with a parallel end face is added between the two detection blocks. Its end face is parallel to the mounting base. The position and orientation of the detection component can be quickly calibrated before each test, eliminating systematic errors caused by long-term use or environmental factors. This maintains the long-term stability and measurement consistency of the detection mechanism and further enhances the reliability of the test results. 3. The lifting assembly controls the lifting state of the first plate through the drive device, so that when it is lifted, the torsion beam is supported by the limiting assembly alone, and when it is lowered, it is supported by the reference assembly. The lifting of the first plate performs preliminary limiting installation of the torsion beam, avoiding the collision problem between the torsion beam and the detection block in the traditional clamping method, avoiding the detection block calibration failure caused by improper clamping, and further improving the reliability of the detection data. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A top view of a novel symmetry detection mechanism provided in this application; Figure 2 An isometric drawing of the detection device in a novel symmetry detection mechanism provided in this application; Figure 3 An exploded view of the test piece in a novel symmetry testing mechanism provided in this application; Figure 4 An isometric drawing of the mounting base in a novel symmetry testing mechanism provided in this application; Figure 5 Axonometric drawings of a novel symmetry detection mechanism, including a telescopic cylinder, gear, rack, and two mounting bases, provided for this application; Figure 6 Axonometric drawings of the fixed base, bracket, connector and calibration parts in a novel symmetry testing mechanism provided in this application; Figure 7 The assembly isometric drawing of the first plate, the limiting component and the torsion beam in a novel symmetry detection mechanism provided in this application.

[0025] Explanation of reference numerals in the attached drawings: 1. Base plate; 2. Detection device; 21. Fixed seat; 22. Moving seat; 221. Telescopic cylinder; 222. Gear; 223. Rack; 23. Calibration part; 24. Bracket; 241. Second groove; 25. Connector; 26. Displacement sensor; 3. Detection part; 31. Detection block; 32. Mounting seat; 321. Ball socket; 33. First rod; 331. Steering ball head; 34. Ball head plunger; 4. First plate; 5. First limiting part; 6. Second limiting part; 7. Torsion beam; 8. Reference part; 9. Fixing part. Detailed Implementation

[0026] This application provides a novel symmetry detection mechanism to solve the technical problem that the detection block cannot fully fit the sleeve in existing symmetry detection mechanisms, resulting in low detection accuracy.

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0031] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0032] Example: Figures 1 to 7The embodiment of this application provides a novel symmetry detection mechanism, comprising: two detection devices 2 fixedly mounted on a base plate 1 and a torsion beam mounting assembly mounted on the base plate 1. The torsion beam mounting assembly includes a reference assembly and a fixing assembly. The reference assembly includes four reference members 8 for positioning and supporting the torsion beam 7. The fixing assembly includes four fixing members 9 that cooperate with the reference members 8 to fix the torsion beam 7. Each fixing member 9 is provided with a fixing head that cooperates with the upper end of the reference member 8 to fix the torsion beam 7. Each fixing head can rotate upward away from the reference member 8. Each detection device 2 consists of a fixed base 21 and a movable base 22. The fixed base 21 is provided with a slide rail suitable for sliding the movable base 22. The fixed base 21 is provided with a displacement sensor 26. The movable base 22 is provided with a corresponding test piece. Each movable base 22 includes two adaptive and sleeve-attached... The detection component 3 includes a detection block 31 with two parallel end faces, a mounting base 32, and a first rod 33. The first rod 33 is perpendicularly connected to one end face of the detection block 31. The mounting base 32 has a ball socket 321. The other end of the first rod 33 has a steering ball head 331 suitable for embedding into the ball socket 321. The two detection blocks 31 are arranged opposite each other. The movable base 22 has two vertically parallel guide rails. Between the two guide rails is a gear 222 and two racks 223 that mesh with the gear 222 and are arranged parallel to the guide rails. Each mounting base 32 is fixedly connected to one rack 223 and slidably connected to the other rack 223. Each detection device 2 is equipped with a telescopic cylinder 221. The telescopic cylinder 221 is connected to a mounting base 32 and is used to control the two mounting bases 32 to move synchronously towards or away from each other.

[0033] During testing, the torsion beam 7 is first installed on the base plate 1 using four reference pieces 8, so that the two sleeves are respectively located at the sleeve testing positions of the two testing devices 2. Then, the position of the torsion beam 7 is fixed by four fixing pieces 9 to complete the installation of the torsion beam 7. After the torsion beam 7 is installed, the telescopic cylinder 221 is activated, and the two testing blocks 31 move closer to the sleeves synchronously. The front end face of the testing block 31 is connected with the end face of the sleeve through a spherical bearing to achieve adaptive fitting.

[0034] Based on the above technical solution, by fixing the detection block 31 to the mounting base 32 in a rotatable manner using a spherical bearing, the end face of the detection block 31 and the end face of the sleeve are adaptively fitted, ensuring that the detection block 31 on the detection device 2 is in close contact with the two end faces of the sleeve, thereby improving the data accuracy of symmetrical detection.

[0035] In this embodiment, as Figure 4 As shown, the mounting base 32 has four first grooves arranged circumferentially around the ball socket 321 on the end face facing the detection block 31. Each first groove is fitted with a ball plunger 34, and the ball ends of all the ball plungers 34 are in zero-preload contact with the end face of the detection block 31.

[0036] During the testing process, when the testing block 31 deflects, the ball head end is pressed into the ball head plunger 34. The spring inside the ball head plunger 34 is compressed, providing the force for the ball head end to reset, thereby applying a certain thrust to the end face of the testing block 31.

[0037] Based on the above scheme, four ball-head plungers 34 are provided on the end face of the mounting base 32 facing the detection block 31. After the detection block 31 rotates, it provides a certain thrust to ensure that the front end face of the detection block 31 fits with the sleeve, avoids gaps, and further improves the detection accuracy of the equipment.

[0038] Since the detection block 31 rotates to a certain extent during each symmetrical inspection, there is a problem of the detection block 31 getting stuck when it comes into contact with the sleeve in its deflected state. To avoid the impact of the deflection of the detection block 31 during the current inspection on the next sleeve inspection, in this embodiment, as follows... Figure 2 and Figure 6 As shown, a bracket 24 is provided on the fixed base 21. The bracket 24 is positioned on the back of the movable base 22 relative to the detection block 31. The upper end face of the bracket 24 is provided with a connector 25 for flipping up and down and a second groove 241 suitable for the connector 25 to be inserted. One end of the connector 25 is rotatably connected to the end of the second groove 241 away from the movable base 22. The other end of the connector 25 is provided with a calibration part 23. A handle is provided on the side of the connector 25 away from the second groove 241. The calibration part 23 is cylindrical. The axis of the calibration part 23 is parallel to the moving direction of the mounting base 32. The two end faces of the calibration part 23 are arranged parallel to each other. The two parallel end faces of the calibration part 23 are arranged parallel to the end face of the mounting base 32 facing the detection block 31.

[0039] During testing, the operator first pushes the connector 25 into the second groove 241 and it fits against the bottom of the groove 241. At this time, the calibration part 23 is located on the sleeve testing station. Then, the telescopic cylinder 221 is activated to control the two mounting seats 32 to move closer to the calibration part 23 for zeroing. During this process, since the calibration part 23 is in a fixed state, the relative positions of the moving seat 22 and the fixed seat 21 are adjusted simultaneously as the mounting seats 32 move closer to each other. After the zeroing is completed, the telescopic cylinder 221 controls the two mounting seats 32 to move away from the calibration part 23 simultaneously. The operator flips the connector 25 up using the handle to move the calibration part 23 away from the sleeve testing station.

[0040] Based on the above technical solution, by setting a rotatable calibration part 23 on the fixed seat 21 of the detection device 2, the position of the moving seat 22 and the two detection blocks 31 can be calibrated, ensuring that each detection is carried out smoothly and avoiding the problem of sticking and jamming caused by the deflection of the detection blocks 31.

[0041] Since the two sleeves need to be placed on the testing station of the testing device 2 before the torsion beam 7 is installed, in order to avoid the problem of the testing block 31 deflecting due to the collision between the sleeves and the testing block 31 when the torsion beam 7 is placed, in this embodiment, as follows: Figure 1 and Figure 7 As shown, the torsion beam mounting assembly also includes a lifting assembly. The lifting assembly includes a first plate 4, a driving device mounted on the base plate 1 for driving the first plate 4 to rise and fall, and a limiting assembly mounted on the upper end face of the first plate 4 for supporting the torsion beam 7. The base plate 1 has a liftable first plate 4 driven by the driving device. The limiting assembly includes two first limiting members 5 and two second limiting members 6 mounted on the upper end face of the first plate 4. The two first limiting members 5 and the two second limiting members 6 are symmetrically distributed relative to the axis of symmetry between the two detection devices 2. The two first limiting members 5 are located on the first plate 4 in the area corresponding to the crossbeam of the torsion beam 7, and the two second limiting members 6 are respectively located on the first plate 4 in the area corresponding to the two longitudinal arms of the torsion beam 7. When the first plate 4 is in the lowered state, the first limiting members 5, the second limiting members 6 and the four reference members 8 jointly support the torsion beam 7.

[0042] During testing, the first plate 4 is in a raised state. The operator first supports the torsion beam 7 on the first plate 4 using the first limiting member 5 and the second limiting member 6. Then, the first plate 4 is lowered so that the torsion beam 7 contacts the four reference members 8. Finally, the torsion beam 7 is fixed by the four fixing members 9, thus completing the fixed installation of the torsion beam 7.

[0043] Based on the above technical solution, by setting a liftable first plate 4 on the base plate 1, and setting a first limiting member 5 and a second limiting member 6 on the first plate 4 to limit and support the torsion beam 7, the torsion beam 7 can be vertically lowered into the testing station, avoiding the risk of collision and displacement between the sleeve and the testing block 31 during direct installation, and further improving the accuracy of the test.

[0044] It should be noted that the order of the embodiments described above is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. Furthermore, specific embodiments have been described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims can be performed in a different order than that shown in the embodiments and still achieve the desired result. Additionally, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0045] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0046] This specification and accompanying drawings are merely illustrative examples of this application and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Therefore, if such modifications and modifications fall within the scope of this application and its equivalents, this application intends to include such modifications and modifications.

Claims

1. A novel symmetry detection mechanism, characterized in that: The device includes a base plate (1), a detection device (2) symmetrically arranged on the base plate (1) along two opposing torsion beams, and a torsion beam mounting assembly arranged on the base plate (1). The detection device (2) has two opposing detection elements (3) facing the torsion beam mounting assembly and designed for adaptive fitting with the sleeve. Each detection element (3) includes a detection block (31) with two parallel end faces, a mounting base (32), and a first rod (33). One end of the first rod (33) is connected to one end face of the detection block (31). The first rod (33) is perpendicular to the end face of the detection block (31), and the other end of the first rod (33) is provided with a steering ball head (331). The mounting base (32) is provided with a ball socket (321) suitable for the steering ball head (331) to be embedded and installed. The end face of the detection block (31) connected to the first rod (33) is spaced apart from the mounting base. The detection device (2) also includes a drive assembly for driving the two detection elements (3) to move towards or away from each other and a displacement sensor (26) for feeding back the movement data of the detection elements (3).

2. The novel symmetry detection mechanism according to claim 1, characterized in that, The mounting base is provided with a plurality of first grooves arranged circumferentially around the ball socket (321), and each first groove is embedded with a ball plunger (34). The ball ends of all the ball plungers (34) are in zero-preload contact with the end face of the detection block (31) and the first rod (33) connected together.

3. The novel symmetry detection mechanism according to claim 1, characterized in that, The detection device (2) includes a fixed seat (21) fixed on the base plate (1) and a movable seat (22) slidably connected to the fixed seat (21) via a slide rail. The drive assembly includes two guide rails arranged parallel to each other, a telescopic cylinder (221) fixed on the movable seat (22), a gear (222), and two racks (223) meshing with the gear (222) and arranged parallel to the guide rails. The two ends of each mounting seat are slidably connected to the two guide rails respectively. The gear (222) is fixed between the two guide rails. The two racks (223) are fixedly connected to one mounting seat (32) and slidably engaged with the other mounting seat (32). The drive end of the telescopic cylinder (221) is connected to one mounting seat (32), and the extension direction of the drive end is parallel to the rack (223).

4. The novel symmetry detection mechanism according to claim 3, characterized in that, The detection device (2) also includes a calibration part (23) located between two detection blocks (31) for calibration. The calibration part (23) is rotatably connected to the fixed base (21). The calibration part (23) has two parallel end faces, and the parallel end faces are arranged parallel to the mounting base.

5. The novel symmetry detection mechanism according to claim 4, characterized in that, The fixed base (21) is provided with a bracket (24). The upper end face of the bracket (24) is provided with a connector (25) for flipping up and down and a second groove (241) suitable for the connector (25) to be embedded. One end of the connector (25) is rotatably connected to the end of the second groove (241) away from the movable base (22). The other end of the connector (25) is connected to the upper end of the calibration part (23).

6. The novel symmetry detection mechanism according to claim 1, characterized in that, The torsion beam mounting assembly further includes a reference assembly and a lifting assembly. The lifting assembly includes a first plate (4), a driving device on the base plate (1) for driving the first plate (4) to rise and fall, and a limiting assembly on the upper surface of the first plate (4) for supporting the torsion beam (7). When the first plate (4) is in a raised state, the limiting assembly supports the torsion beam (7). When the first plate (4) is in a lowered state, the limiting assembly disengages from the torsion beam, and the reference assembly supports the torsion beam (7).

7. A novel symmetry detection mechanism according to claim 6, characterized in that, The limiting component includes a pair of first limiting members (5). Both first limiting members (5) are located on the first plate (4) in the area corresponding to the crossbeam of the torsion beam (7). The two first limiting members (5) are symmetrically distributed relative to the axis of symmetry between the two detection devices (2).

8. A novel symmetry detection mechanism according to claim 7, characterized in that, The limiting component also includes a pair of second limiting members (6). The two second limiting members (6) are respectively located on the first plate (4) in the areas corresponding to the two longitudinal arms of the torsion beam (7). The two second limiting members (6) are symmetrically distributed relative to the axis of symmetry between the two detection devices (2).

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