A calibration device for a bending-torsion beam after forming and a calibration method thereof

Abstract

This invention relates to the field of manufacturing anti-roll bending torsion bars for rail vehicles, specifically providing an inspection and calibration device for formed bending torsion bars for rail vehicles. The device includes a control console, an inspection table, and a support base. The support base is equipped with a bar clamping mechanism, a horizontal transverse clamping mechanism, a horizontal longitudinal clamping mechanism, a vertical position adjustment mechanism, and a detection limiting mechanism. The bar clamping mechanism clamps the bar portion; the vertical position adjustment mechanism adjusts the clamping height of the middle arm of the bending torsion bar; the detection limiting mechanism detects the flatness and center distance of the bending torsion bar; the horizontal transverse clamping mechanism corrects the torsion deviation of the bending torsion bar; and the horizontal longitudinal clamping mechanism corrects the center distance of the bending torsion bar. The horizontal longitudinal clamping mechanism is perpendicular to the horizontal transverse clamping mechanism. This invention also provides a method for inspecting and calibrating formed bending torsion bars for rail vehicles. The solution in this invention integrates rapid detection and calibration, ensuring efficient product inspection and calibration and improving the product qualification rate.

Description

Technical Field

[0001] This invention relates to the field of manufacturing anti-roll bending torsion bars for rail vehicles, and more particularly to a calibration device and calibration method for the formed bending torsion bars for rail vehicles. Background Technology

[0002] Anti-roll torsion bars are typically installed between the car body and the bogie. They are devices that utilize the torsional deformation of a metal elastic rod under torque to provide anti-torsional reaction moment. They are primarily used to improve the anti-roll stiffness of rail vehicles during operation and to suppress car body roll during cornering, crosswinds, and other conditions. To ensure the performance of anti-roll torsion bars, they must be tested during the manufacturing process. The following patents in the prior art relate to the testing of anti-roll torsion bars:

[0003] 1. A utility model patent with patent number "201620458759.9" and patent title "A Forming and Heat Treatment Equipment for a Bending Torsion Bar for Rail Vehicles" includes a control device, a forming system, a quenching system, and guide rails. The forming system includes a worktable, a right wheel mold, a right clamping mold, a right push cylinder, a right bending hand mechanism, a left push cylinder, a left bending hand mechanism, a left clamping mold, a left wheel mold, a drive device, a feeding mechanism, and a position sensor. This solution can complete the bending forming and heat treatment steps in one step, achieving the advantages of dimensional stability and minimal heat treatment deformation in the manufacturing and heat treatment process of integral anti-roll torsion bar shafts.

[0004] 2. The utility model patent with patent number "202220214112.7" and patent name "Tooling for detecting the arc position after thermoforming of a three-dimensional bending torsion bar" includes a detection seat, a detection block, and an arc-shaped detection surface. This solution can meet the detection needs of different batches of products and products with different diameters, and has strong reliability, effectiveness, accuracy, and versatility.

[0005] However, currently, the materials used for anti-roll bending torsion bars in rail vehicles are mostly high-strength alloy steel, with diameters ranging from ø50 to ø80 mm and lengths from 2500 to 3000 mm. The dimensional accuracy of the blanks must be within 2 mm, making the bending and forming of anti-roll bending torsion bars and the control of dimensional accuracy extremely difficult. Currently, the thermoforming process described in the comparative document is commonly used. During thermoforming, the bar is typically heated to over 1000℃ to increase the material's plasticity and reduce its deformation resistance. Then, specialized bending equipment is used to significantly reduce the forming difficulty of the torsion bar. The problems arising from the thermoforming of torsion bars using this method are mainly as follows:

[0006] 1. Dimensional inspection of rods at 1000℃ is difficult, and there are many dimensional inspection items for bending and torsion rods, requiring further testing. Figure 1The center distance shown at point B, the angle shown at point C, the arm height shown at point A, and the torsion shown at point D all contribute to very low production efficiency.

[0007] 2. When the dimensions are not up to standard, the residual heat of thermoforming is used for thermal correction. The correction process is mainly controlled by manual experience and requires repeated testing and correction to meet the standard. Some items may even require repeated heating. The operation is labor-intensive and cannot achieve continuous production, which is a bottleneck to achieving automated operation.

[0008] The aforementioned existing technologies only concern the equipment and methods used in the bending and forming process of torsion bars, or dimensional inspection methods for specific local locations of torsion bars. They do not address solutions for full-dimensional inspection and correction of torsion bars after forming, nor can they resolve the problems arising from the thermoforming of torsion bars. Therefore, designing a roll-resistant torsion bar inspection and calibration structure and method that integrates rapid inspection and correction and can be used for post-forming inspection of torsion bars is an urgent problem to be solved. Summary of the Invention

[0009] To address the aforementioned problems, this invention provides an inspection and calibration device and method for the formed bending torsion bar of rail vehicles. This device and method can improve inspection and calibration efficiency, increase product qualification rate, ensure the consistency of the dimensions of the bending torsion bar after bending, reduce operation frequency, and save labor and energy.

[0010] To achieve the above objectives, the present invention proposes the following technical solution: a calibration device for a torsion bar formed for rail vehicles, comprising a control console, a calibration platform located on the side of the control console, and a support base slidably connected to the calibration platform and symmetrically arranged. The support base is provided with a bar clamping mechanism, a horizontal transverse clamping mechanism, a horizontal longitudinal clamping mechanism, a vertical position adjustment mechanism, and a detection limiting mechanism. The bar clamping mechanism is fixed to the inner side of the support base to clamp the bar portion. The vertical position adjustment mechanism is located outside the bar clamping mechanism and is used to adjust the clamping height of the middle arm portion of the torsion bar. The detection limiting mechanism, the horizontal transverse clamping mechanism, and the horizontal longitudinal clamping mechanism are all located on the vertical position adjustment mechanism. The two arms of the torsion bar are limited within the detection limiting mechanism, and the flatness and center distance of the torsion bar are detected by the detection limiting mechanism. The horizontal transverse clamping mechanism is connected to the detection limiting mechanism and is used to correct the torsion of the torsion bar. The horizontal longitudinal clamping mechanism is connected to the detection limiting mechanism and is used to correct the center distance of the torsion bar. The horizontal longitudinal clamping mechanism is arranged perpendicularly to the horizontal transverse clamping mechanism.

[0011] Furthermore, the rod clamping mechanism includes a clamping seat and a clamping drive for extending and retracting the clamping seat; the inner end face of the clamping seat is coplanar with the inner end face of the support seat, the clamping seat includes a fixed clamping seat one and a movable clamping seat two, the clamping seat two is connected to the power output end of the clamping drive and is driven by the clamping drive to extend and retract toward the clamping seat one; the inner ends of the clamping seat one and the clamping seat two are provided with concave surfaces opposite each other, and the rod part of the torsion bar is clamped between the clamping seat one and the clamping seat two.

[0012] Furthermore, the detection limiting mechanism includes a detection seat with a detection groove, and a limiting platform is provided on the outer end wall of the detection seat on the side away from the clamping seat, extending into the detection groove in the direction of the clamping seat; a receiving area for the torsion bar arm is formed between the limiting platform and the outer end wall.

[0013] Furthermore, the horizontal lateral clamping mechanism includes a horizontal lateral drive component, the power output end of which is fixedly connected to the detection seat, and the power output rod of the horizontal lateral drive component is set perpendicular to the rod portion.

[0014] Furthermore, the horizontal longitudinal clamping mechanism includes a horizontal longitudinal driving member, the power output end of which is fixedly connected to the detection seat, and the power output rod of the horizontal longitudinal driving member is arranged parallel to the rod portion and perpendicular to the power output rod of the horizontal transverse driving member.

[0015] Furthermore, the vertical position adjustment mechanism includes a vertical seat located on a support base, the vertical seat includes a vertically arranged guide rail and a lead screw slidably matched and connected to the guide rail, and the upper end of the lead screw is fixedly connected to a horizontal transverse clamping mechanism and a horizontal longitudinal clamping mechanism.

[0016] Furthermore, the calibration table is provided with a slide rail arranged parallel to the rod, and the support base is slidably connected to the slide rail; the support base includes two symmetrically arranged supports, which can move closer or further away along the slide rail.

[0017] Furthermore, a flatness sensor is provided at the lower end of the outer end wall of the detection seat on the side away from the clamping seat, and a size scale is provided in the detection groove.

[0018] A method for inspecting and calibrating a torsion bar for rail vehicles after molding, wherein the inspection and calibration are performed by the aforementioned inspection and calibration device, includes the following steps:

[0019] S1: Based on the overall length of the torsion bar to be tested, slide the two support seats on the slide rail to adjust the distance between the two support seats;

[0020] S2: Based on the overall height of the torsion bar to be tested, drive the lead screw to move up and down to adjust the clamping height position of the arm.

[0021] S3: Place the torsion bar between clamp one and clamp two;

[0022] S4: Place the arm of the torsion bar in the detection groove and limit the arm to the receiving area. At this time, the flatness sensor detects the flatness of the two arms, and the size scale detects the center distance of the two arms.

[0023] S5: When the flatness sensor detects that the flatness of the two arms is not up to standard, the clamping drive is activated to move the second clamp towards the first clamp and clamp the rod of the torsion bar. The horizontal lateral drive is activated to move the detection seat laterally with the arm to correct the torsion of the torsion bar. When the dimension scale detects that the center distance of the two arms is not up to standard, the clamping drive is activated to move the second clamp towards the first clamp and clamp the rod of the torsion bar. The horizontal longitudinal drive is activated to move the detection seat longitudinally with the arm to correct the center distance of the torsion bar.

[0024] S6: After the flatness and center distance of the torsion bar are corrected, close the clamping drive to release the clamp and the clamp from the bar. Then, the flatness of the two arms is detected by the flatness sensor, and the center distance of the two arms is detected by the dimensional scale. If the flatness and center distance are qualified, the inspection is completed and the bar is unloaded. If the flatness and center distance are not qualified, repeat S5 to correct the flatness and center distance of the torsion bar until the flatness and center distance are qualified.

[0025] The beneficial effects of this invention are as follows: This invention integrates rapid detection and precise correction of torsion bars into one unit. Regardless of whether the product is qualified after thermoforming, the product can undergo rapid correction and detection uniformly, which can save labor, improve efficiency, ensure the consistency of the cycle time in the torsion bar manufacturing process, provide a guarantee for the realization of standardized automated operation, ensure the consistency of the dimensions of the torsion bar after bending, realize the upgrade of the torsion bar manufacturing capability, eliminate repeated correction and multiple heating corrections, reduce the frequency of operation, save energy consumption, and at the same time, this solution has strong applicability and can be used for any torsion bar of different lengths and diameters. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the bending torsion bar provided in an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of the overall structure of the calibration device provided in this embodiment of the invention. Figure 1 .

[0028] Figure 3 This is a schematic diagram of the overall structure of the calibration device provided in this embodiment of the invention. Figure 2 (The console is not shown; M represents vertical orientation, and N represents horizontal orientation).

[0029] Figure 4 yes Figure 3 A magnified view of the area at point S in the middle.

[0030] Reference numerals: 1. Control console; 2. Calibration table; 3. Support seat; 4. Rod clamping mechanism; 5. Horizontal transverse clamping mechanism; 6. Horizontal longitudinal clamping mechanism; 7. Vertical position adjustment mechanism; 8. Detection limiting mechanism; 9. Clamping seat 1; 10. Clamping seat 2; 11. Concave surface; 12. Clamping drive component; 13. Detection seat; 14. Detection groove; 15. Limiting platform; 16. Outer end wall; 17. Receiving area; 18. Horizontal transverse drive component; 19. Horizontal longitudinal drive component; 20. Vertical seat; 21. Slide rail; 22. Bending and torsion bar; 23. Rod part; 23a. Arm part; 23b. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the following description is provided in conjunction with the appendix. Figure 1-4 The present invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and do not constitute a limitation thereof.

[0032] A calibration device for the forming of a torsion bar for rail vehicles, such as Figure 1 As shown, the torsion bar 23 includes a rod portion 23a and arm portions 23b connecting the two ends of the rod portion 23a, as... Figure 2 As shown, the calibration device includes a control console 1, a calibration platform 2 located to the side of the control console 1, and symmetrically arranged support seats 3 slidably connected to the calibration platform 2. The support seats 3 are equipped with a rod clamping mechanism 4, a horizontal transverse clamping mechanism 5, a horizontal longitudinal clamping mechanism 6, a vertical position adjustment mechanism 7, and a detection limiting mechanism 8. The calibration platform 2 has a slide rail 22 parallel to the rod 23a, and the support seats 3 are slidably connected to the slide rail 22. Two support seats 3 are symmetrically arranged, and the two support seats 3 can move closer to or further away from each other along the slide rail 22. The control console 1 is used by operators for parameter setting, button operation, etc., to achieve rapid judgment and handling of the bent and torsion rod 23.

[0033] like Figure 3 , 4 As shown, the rod clamping mechanism 4 is fixed to the inner side of the support base 3 to clamp the rod portion 23a of the torsion bar 23. The rod clamping mechanism 4 includes a clamping seat 9 and a clamping drive member 13 that drives the clamping seat 9 to extend and retract. The inner end face of the clamping seat 9 is coplanar with the inner end face of the support base 3. The clamping seat 9 includes a fixed clamping seat 10 and a movable clamping seat 21. The clamping seat 21 is connected to the power output end of the clamping drive member 13 and is driven by the clamping drive member 13 to extend and retract towards the clamping seat 10. The inner ends of the clamping seat 10 and the clamping seat 21 are provided with concave surfaces 12 to stably clamp the rod portion 23a. The rod portion 23a of the torsion bar 23 is clamped between the clamping seat 10 and the clamping seat 21. The rod clamping mechanism 4 plays the role of supporting and fixing the torsion bar 23 during both the testing and calibration processes. The difference is that the torsion bar 23 is not clamped during testing, but is clamped during calibration.

[0034] The vertical position adjustment mechanism 7 is located outside the rod clamping mechanism 4 and is used to adjust the clamping height of the middle arm 23b of the torsion bar 23. The vertical position adjustment mechanism 7 includes a vertical seat 21 located on the support base 3. The vertical seat 21 includes a vertically arranged guide rail and a lead screw slidably matched and connected to the guide rail. The upper end of the lead screw is fixedly connected to the horizontal transverse clamping mechanism 5 and the horizontal longitudinal clamping mechanism 6. In this embodiment, the guide rail and the lead screw are located inside the vertical seat 21. The detection and limiting mechanism 8, the horizontal transverse clamping mechanism 5, and the horizontal longitudinal clamping mechanism 6 are all located on the vertical seat 21 of the vertical position adjustment mechanism 7. The upper end of the lead screw is fixedly connected to the horizontal transverse clamping mechanism 5 and the horizontal longitudinal clamping mechanism 6.

[0035] The two arms 23b of the torsion bar 23 are confined within the detection limiting mechanism 8, and the flatness and center distance of the torsion bar 23 are detected by the detection limiting mechanism 8. Figure 2-4 As shown, the detection limiting mechanism 8 includes a detection seat 14 with a detection groove 15. A limiting platform 16 extends into the detection groove 15 from the outer end wall 17 of the detection seat 14 on the side away from the clamping seat 9. A receiving area 18 for the arm 23b of the torsion bar 23 is formed between the limiting platform 16 and the outer end wall 17. A flatness sensor is provided at the lower end of the outer end wall 17 on the side away from the clamping seat 9, and a dimensional scale is provided in the detection groove 15. The detection limiting mechanism 8 can ensure that the torsion bar 23 can be quickly mechanically inspected, and quickly determine whether the dimensions are qualified or unqualified, providing a rapid dimensional inspection function for the product.

[0036] The horizontal lateral clamping mechanism 5 is connected to the detection and limiting mechanism 8 and is used to correct the torsion of the bent-torsion bar 23. The horizontal lateral clamping mechanism 5 includes a horizontal lateral drive member 19, the power output end of which is fixedly connected to the detection seat 14, and the power output rod of the horizontal lateral drive member 19 is perpendicular to the rod portion 23a. The horizontal lateral clamping mechanism 5 can realize the action of lateral pushing and pulling at both ends of the bent-torsion bar 23.

[0037] The horizontal longitudinal clamping mechanism 6 is connected to the detection limiting mechanism 8 and is used to correct the center distance of the bending and torsion bar 23. The horizontal longitudinal clamping mechanism 6 is arranged perpendicularly to the horizontal transverse clamping mechanism 5. The horizontal longitudinal clamping mechanism 6 includes a horizontal longitudinal driving member 20. The power output end of the horizontal longitudinal driving member 20 is fixedly connected to the detection seat 14. The power output rod of the horizontal longitudinal driving member 20 is arranged parallel to the rod portion 23a and perpendicular to the power output rod of the horizontal transverse driving member 19.

[0038] A method for inspecting and calibrating a torsion bar 23 for rail vehicles after molding, wherein the inspection and calibration are performed by the aforementioned inspection and calibration device, includes the following steps:

[0039] S1: Based on the overall length of the torsion bar 23 to be tested, slide the two support seats 3 on the slide rail 22 to adjust the distance between the two support seats 3;

[0040] S2: Based on the overall height of the torsion bar 23 to be tested, drive the lead screw to move up and down to adjust the clamping height position of the arm 23b;

[0041] S3: Place the torsion bar 23 between clamp 10 and clamp 21;

[0042] S4: Place the arm 23b of the torsion bar 23 in the detection groove 15 and limit the arm 23b to the receiving area 18. At this time, the flatness sensor detects the flatness of the two arms 23b and the size scale detects the center distance of the two arms 23b.

[0043] S5: When the flatness sensor detects that the flatness of the two arms 23b is not up to standard, the clamping drive 13 is activated to drive the clamping seat 2 11 to move toward the clamping seat 10 and clamp the rod part 23a of the torsion bar 23. The horizontal lateral drive 19 is activated to drive the detection seat 14 to move the arms 23b laterally to correct the torsion of the torsion bar 23. When the dimension scale detects that the center distance of the two arms 23b is not up to standard, the clamping drive 13 is activated to drive the clamping seat 2 11 to move toward the clamping seat 10 and clamp the rod part 23a of the torsion bar 23. The horizontal longitudinal drive 20 is activated to drive the detection seat 14 to move the arms 23b longitudinally to correct the center distance of the torsion bar 23.

[0044] S6: After the flatness and center distance of the torsion bar 23 are corrected, close the clamping drive 13 to release the bar 23a from the clamping seat 11 and clamping seat 10. Then, the flatness of the two arms 23b is detected by the flatness sensor, and the center distance of the two arms 23b is detected by the dimension scale. If the flatness and center distance are qualified, the inspection is completed and the bar is unloaded. If the flatness and center distance are not qualified, repeat S5 to correct the flatness and center distance of the torsion bar 23 until the flatness and center distance are qualified.

[0045] Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

[0046] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A calibration device for a torsion bar formed for rail vehicles, characterized in that, The system includes a control console (1), a calibration table (2) located to the side of the control console (1), and a support base (3) slidably connected to the calibration table (2) and symmetrically arranged. The support base (3) is equipped with a rod clamping mechanism (4), a horizontal transverse clamping mechanism (5), a horizontal longitudinal clamping mechanism (6), a vertical position adjustment mechanism (7), and a detection limiting mechanism (8). The rod clamping mechanism (4) is fixed to the inner side of the support base (3) to clamp the rod part (23a) of the torsion bar (23). The vertical position adjustment mechanism (7) is located on the outer side of the rod clamping mechanism (4) and is used to adjust the clamping height of the middle arm part (23b) of the torsion bar (23). The detection limiting mechanism (8), the horizontal transverse clamping mechanism (5), and the horizontal longitudinal clamping mechanism (6) are also included. All are located on the vertical position adjustment mechanism (7); the two arms (23b) of the torsion bar (23) are limited within the detection limiting mechanism (8) and the flatness and center distance of the torsion bar (23) are detected by the detection limiting mechanism (8); the horizontal transverse clamping mechanism (5) is connected to the detection limiting mechanism (8) and used to correct the torsion of the torsion bar (23); the horizontal longitudinal clamping mechanism (6) is connected to the detection limiting mechanism (8) and used to correct the center distance of the torsion bar (23); the horizontal longitudinal clamping mechanism (6) is perpendicular to the horizontal transverse clamping mechanism (5); the rod clamping mechanism (4) includes a clamping seat (9) and a clamping drive (13) for extending and retracting the clamping seat (9); the inner end face of the clamping seat (9) and the support seat (3) are... The inner end faces are coplanar. The clamping seat (9) includes a fixed clamping seat one (10) and a movable clamping seat two (11). The clamping seat two (11) is connected to the power output end of the clamping drive member (13) and is driven by the clamping drive member (13) to extend and retract toward the clamping seat one (10). The inner ends of the clamping seat one (10) and the clamping seat two (11) are provided with concave surfaces (12). The rod part (23a) of the torsion bar (23) is clamped between the clamping seat one (10) and the clamping seat two (11). The detection limiting mechanism (8) includes a detection seat (14) with a detection groove (15). On the outer end wall (17) of the detection seat (14) away from the clamping seat (9), a limiting platform extends into the detection groove (15) toward the clamping seat (9). 16); A receiving area (18) for the arm (23b) of the torsion bar (23) is formed between the limiting platform (16) and the outer end wall (17); The horizontal transverse clamping mechanism (5) includes a horizontal transverse drive member (19), the power output end of the horizontal transverse drive member (19) is fixedly connected to the detection seat (14), and the power output rod of the horizontal transverse drive member (19) is arranged perpendicularly to the rod part (23a); The horizontal longitudinal clamping mechanism (6) includes a horizontal longitudinal drive member (20), the power output end of the horizontal longitudinal drive member (20) is fixedly connected to the detection seat (14), and the power output rod of the horizontal longitudinal drive member (20) is arranged parallel to the rod part (23a) and perpendicular to the power output rod of the horizontal transverse drive member (19);The vertical position adjustment mechanism (7) includes a vertical seat (21) located on the support seat (3). The vertical seat (21) includes a vertically arranged guide rail and a lead screw slidably connected to the guide rail. The upper end of the lead screw is fixedly connected to the horizontal transverse clamping mechanism (5) and the horizontal longitudinal clamping mechanism (6). The calibration table (2) is provided with a slide rail (22) arranged parallel to the rod (23a). The support seat (3) is slidably connected to the slide rail (22). The support seat (3) includes two symmetrically arranged support seats. The two support seats (3) can move closer to or further away from each other along the slide rail (22). The outer end wall (17) of the detection seat (14) away from the clamping seat (9) is provided with a flatness sensor. The detection groove (15) is provided with a size scale.

2. A method for inspecting and calibrating a torsion bar for rail vehicles after molding, wherein the inspection and calibration are performed by the inspection and calibration device described in claim 1, characterized in that, Includes the following steps: S1: Based on the overall length of the torsion bar (23) to be tested, slide the two support seats (3) on the slide rail (22) to adjust the distance between the two support seats (3); S2: Based on the overall height of the torsion bar (23) to be tested, drive the lead screw to move up and down to adjust the clamping height position of the arm (23b); S3: Place the torsion bar (23) between clamp one (10) and clamp two (11); S4: Place the arm (23b) of the torsion bar (23) in the detection groove (15) and limit the arm (23b) to the receiving area (18). At this time, the flatness sensor detects the flatness of the two arms (23b) and the size scale detects the center distance of the two arms (23b). S5: When the flatness sensor detects that the flatness of the two arms (23b) is not up to standard, the clamping drive (13) is activated to drive the second clamp (11) to move toward the first clamp (10) and clamp the rod (23a) of the torsion bar (23). The horizontal drive (19) is activated to drive the detection seat (14) to move the arm (23b) laterally to correct the torsion of the torsion bar (23). When the dimension scale detects that the center distance of the two arms (23b) is not up to standard, the clamping drive (13) is activated to drive the second clamp (11) to move toward the first clamp (10) and clamp the rod (23a) of the torsion bar (23). The horizontal longitudinal drive (20) is activated to drive the detection seat (14) to move the arm (23b) longitudinally to correct the center distance of the torsion bar (23). S6: After the flatness and center distance of the torsion bar (23) are corrected, close the clamping drive (13) so that clamping seat two (11) and clamping seat one (10) release the bar (23a). Then, the flatness of the two arms (23b) is detected by the flatness sensor and the center distance of the two arms (23b) is detected by the dimension scale. If the flatness and center distance are qualified, the inspection is completed and the material is unloaded. If the flatness and center distance are not qualified, repeat S5 to correct the flatness and center distance of the torsion bar (23) until the flatness and center distance are qualified.

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