Overturning clamp for testing residual stress of steel plate

Abstract

The utility model relates to an overturning clamp for testing residual stress of a steel plate, which comprises a clamping frame, a lifting cylinder arranged on the clamping frame, a lifting seat arranged on the lifting cylinder, a bearing seat and a movable overturning rack arranged on the lifting seat, an overturning shaft mounted on the bearing seat, an overturning gear sleeved on the overturning shaft and meshed with the overturning rack, and an overturning shaft mounted on the overturning gear. One end of the overturning shaft penetrates out of the bearing seat and is fixedly connected with a clamping air cylinder, the clamping air cylinder clamps a suction device, the suction device is connected with a clamping plate through a connecting hole and a connecting bolt, a suction hole is formed in the clamping plate, and the suction hole is communicated with an air pumping and discharging assembly of the suction device. A clamped steel plate can rotate, and then an ultrasonic stress detector can be matched to carry out residual stress testing on the two faces of a lineation part of the steel plate, so that the testing result is more accurate.

Description

Technical Field

[0001] The utility model relates to the field of residual stress testing, in particular to a turnover fixture for residual stress testing of steel plates. Background Art

[0002] Residual Stress is the self-balanced internal stress that remains in an object after eliminating external forces or uneven temperature fields. Mechanical processing and strengthening processes can cause residual stress, such as cold drawing, bending, cutting, rolling, shot peening, casting, forging, welding and metal heat treatment, etc., which may cause residual stress due to uneven plastic deformation or phase change. Residual stress is generally harmful. For example, after improper heat treatment, welding or cutting, residual stress can cause parts to warp or twist, or even crack; or cracks will appear on the surface after quenching and grinding; the existence of residual stress sometimes does not immediately appear as a defect, but when the total stress exceeds the strength limit due to the superposition of working stress and residual stress, cracks and fractures will appear.

[0003] The ultrasonic stress detector includes a host, detection software, and ultrasonic receiver / transmitter. At the same time, it is also necessary to prepare the corresponding zero stress specimen according to the object to be inspected. With the zero stress specimen as a reference, the residual stress of the material is detected by emitting and receiving ultrasonic waves. The detection depth can reach 3-5mm. Compared with the strip cutting method, blind hole method, X-ray diffraction method, neutron diffraction method, etc., ultrasonic stress detection can achieve non-destructive testing.

[0004] In the process of industrial steel plates being formed from steel coils, residual stress is bound to exist. The residual stress may have a certain impact on the bending process of the steel plates. The bending part is partially warped due to the action of stress, which will cause partial concave or convex warping of the bent steel plate, which will greatly affect the subsequent use of the steel plate. Therefore, residual stress testing is required, especially for the residual stress at the bending part. A fixture is required to cooperate with an ultrasonic stress detector to realize the residual stress test at the bending part of the steel plate. In the process of data measurement in the laboratory, it is necessary to perform residual stress tests on multiple points on both sides of the bending part of the steel plate. Therefore, it is urgent to design a flip fixture that can cooperate with an ultrasonic stress detector to perform double-sided multi-point testing on the steel plate. Utility Model Content

[0005] The utility model aims to provide a flip fixture for residual stress testing of steel plates, which can realize the rotation of the clamped steel plates, and then cooperate with an ultrasonic stress detector to perform residual stress testing on both sides of the scored part of the steel plates, so as to make the test results more accurate.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is: a flip fixture for residual stress testing of steel plates, including a clamping frame, a lifting cylinder is arranged on the clamping frame, a lifting seat is arranged on the lifting cylinder, a bearing seat and a movable flip rack are arranged on the lifting seat, a flip shaft is installed on the bearing seat, a flip gear meshing with the flip rack is sleeved on the flip shaft, one end of the flip shaft passes through the bearing seat and is fixedly connected with the clamping cylinder, the clamping cylinder clamps the extractor, the extractor is connected to the clamping plate through a connecting hole and a connecting bolt, the clamping plate is provided with a suction hole, and the suction hole is connected to the air extraction and exhaust assembly of the extractor.

[0007] Preferably, the clamping plate is provided with three suction holes distributed in a triangle shape, and a suction sleeve is installed in each suction hole, and the suction sleeve is connected to the air extraction and exhaust assembly of the extractor.

[0008] Preferably, the lifting seat is provided with an adjusting slide rail, the adjusting slide rail is matched with an adjusting seat, the bearing seat and the flip rack are both arranged on the adjusting seat, and the adjusting seat is provided with a movable groove matched with the flip rack.

[0009] Preferably, the adjustment seat is provided with a mounting hole for installation, the adjustment rail is evenly provided with threaded holes matching with the mounting hole, and the adjustment seat is locked on the adjustment rail by bolts matching with the mounting hole and the threaded hole.

[0010] The technical effects of the utility model are:

[0011] The clamped steel plate can be rotated, and then the residual stress test can be carried out on both sides of the marked part of the steel plate in cooperation with the ultrasonic stress detector, so that the test result is more accurate.

[0012] The design of the suction sleeve prevents the clamping plate from being worn and affecting the suction effect, and the suction sleeve is easy to replace individually, and the replacement cost is lower than that of the clamping plate.

[0013] The design of the adjustable slide rail and the adjustable seat can adjust the initial position of the clamping plate, thereby being able to match steel plates of different sizes or different bending positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a three-dimensional schematic diagram of a first-person perspective of a flip fixture for testing residual stress of a steel plate.

[0015] Figure 2 It is a partial schematic diagram of the matching parts of the adjustment seat and the adjustment slide rail.

[0016] Figure 3 This is a stereoscopic schematic diagram of a second viewing angle of a flip fixture for testing residual stress of a steel plate.

[0017] The text markings in the figure are as follows: 11. Clamping frame; 12. Lifting cylinder; 13. Lifting seat; 14. Adjusting slide rail; 15. Adjusting seat; 16. Bearing seat; 17. Clamping cylinder; 18. Flipping gear; 19. Flipping rack; 20. Suction device; 21. Clamping plate; 22. Connecting hole; 23. Suction hole. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the utility model.

[0019] like Figure 1-3 As shown, the present application is a flip fixture for residual stress testing of steel plates, including a clamping frame 11, a lifting cylinder 12 is arranged on the clamping frame 11, a lifting seat 13 is arranged on the lifting cylinder 12, a bearing seat 16 and a movable flip rack 19 are arranged on the lifting seat 13, a flip shaft is installed on the bearing seat 16, a flip gear 18 meshing with the flip rack 19 is sleeved on the flip shaft, one end of the flip shaft passes through the bearing seat and is fixedly connected with a clamping cylinder 17, the clamping cylinder 17 clamps a suction device 20, the suction device 20 is connected to a clamping plate 21 through a connecting hole and a connecting bolt, a suction hole 23 is opened on the clamping plate 21, and the suction hole 23 and the suction and exhaust gas group of the suction device 20 are connected. The components are connected, the clamping plate 21 is provided with three suction holes 23 distributed in a triangle, a suction sleeve is installed in each suction hole 23, the suction sleeve is connected with the exhaust gas component of the extractor 20, the lifting seat 13 is provided with an adjusting slide rail 14, the adjusting slide rail 14 is matched with an adjusting seat 15, the bearing seat 16 and the flip rack 19 are both arranged on the adjusting seat 15, and the adjusting seat 15 is provided with a movable groove matched with the flip rack 19, the adjusting seat 15 is provided with a mounting hole for installation, the adjusting slide rail 14 is evenly provided with threaded holes matched with the mounting holes, and the adjusting seat 15 is locked on the adjusting slide rail 14 by bolts matching the mounting holes and the threaded holes.

[0020] When in use, draw a bending line on the test steel plate; place the test steel plate on the horizontally upward clamping plate 21, and use the suction device 20 and the suction sleeve to complete the suction of the test steel plate, then push (it can be manual or with a cylinder) to flip the rack 19, thereby driving the flip gear 18 and the flip shaft to rotate a certain angle, thereby driving the clamping plate 21 and the suction device 20 to rotate a certain angle as a whole, and the lifting seat 13 is driven by the lifting cylinder 12 to lift to a suitable height to match the height of the ultrasonic stress detector, and then the ultrasonic stress detector is used to test the residual stress at the marked part of the steel plate, and three points are selected to test the residual stress, and then the test steel plate is flipped, and then the test steel plate is turned over. The ultrasonic stress detector is used to test the residual stress on the back of the steel plate where the markings are made. Three points are also selected to test the residual stress. After the residual stress test is completed, the clamping plate 21 is flipped upward again to stop the negative pressure adsorption of the absorber 20, and the test steel plate can be easily removed; or the flip fixture of the present application can be directly used in conjunction with a horizontally moving mechanism to directly make the clamping plate 21 face horizontally downward, and the lifting cylinder 12 can be used to place the test steel plate on the bending platform and press it. For such situations, for steel plates of different sizes or different bending positions, it is necessary to adjust the initial position of the adjusting seat 15 on the adjusting slide rail 14 to ensure that the suction position of the suction part for the steel plate is suitable.

[0021] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0022] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. The above is only a preferred implementation method of the utility model. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the utility model, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should be regarded as the protection scope of the utility model.

Claims

1. A turning fixture for residual stress testing of steel plates, comprising a clamping frame, characterized in that: A lifting cylinder is arranged on the clamping frame, a lifting seat is arranged on the lifting cylinder, a bearing seat and a movable flip rack are arranged on the lifting seat, a flip shaft is installed on the bearing seat, a flip gear meshing with the flip rack is sleeved on the flip shaft, one end of the flip shaft passes through the bearing seat and is fixedly connected with the clamping cylinder, the clamping cylinder clamps the extractor, the extractor is connected with the clamping plate through the connecting hole and the connecting bolt, the clamping plate is provided with a suction hole, and the suction hole is connected with the suction and exhaust gas component of the extractor.

2. The flip fixture for testing residual stress of a steel plate according to claim 1, characterized in that: The clamping plate is provided with three suction holes distributed in a triangle shape, each suction hole is provided with a suction sleeve, and the suction sleeve is communicated with the suction and exhaust gas component of the suction device.

3. The flip fixture for testing residual stress of a steel plate according to claim 1, characterized in that: The lifting seat is provided with an adjusting slide rail, the adjusting slide rail is matched with an adjusting seat, the bearing seat and the turning rack are both arranged on the adjusting seat, and the adjusting seat is provided with a movable groove matched with the turning rack.

4. The flip fixture for testing residual stress of a steel plate according to claim 3, characterized in that: The adjusting seat is provided with a mounting hole for installation, the adjusting slide rail is evenly provided with threaded holes matching with the mounting hole, and the adjusting seat is locked on the adjusting slide rail by bolts matching with the mounting hole and the threaded hole.

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