Clamping device for constant displacement test of stress corrosion test

Abstract

According to the clamping device for the constant displacement test of the stress corrosion test, a sliding block is arranged at the stretching end of a stretching machine, and a long-strip-shaped hole is formed in a clamping part, so that the stretching machine is in sliding connection with the clamping part, when the stretching machine pulls a clamp for stretching, no-load movement is carried out, and when the stretching end slides to the limiting position, the long-strip-shaped hole is formed in the clamping part; the stretching end is sleeved with a positioning plate, the positioning plate is provided with pull rods located at the two nuts respectively, the ends, away from the positioning plate, of the pull rods are provided with racks, the nuts are sleeved with toothed rings, the toothed rings are located on the moving path of the racks, and when the sample is not clamped, the toothed rings are located between the racks and the positioning plate; when the stretching end moves relative to the clamping piece, namely, no-load movement, the positioning plate can move to drive the rack to move, and the rack is in matched meshing transmission in the moving process to drive the nut to rotate, so that the nut and the stud move in a threaded mode, and secondary clamping can be conducted on the clamp through stress stretching force.

Description

Technical Field

[0001] The utility model relates to the technical field of material testing, in particular to a clamping device for a constant displacement test of stress corrosion testing. Background Art

[0002] The clamping device for the constant displacement test of stress corrosion testing is a device specifically used for maintaining a specimen under constant displacement conditions during a stress corrosion test. This kind of clamping device has important application value in the fields of materials science, corrosion and protection, etc., and can help researchers evaluate the stress corrosion cracking sensitivity of materials in a specific environment. The clamping device usually includes two tensile machines and two clamps for clamping the specimen. The common clamp is two opposite clamping pieces. The two ends of the two clamping pieces are fixedly connected by bolts. By placing the end of the specimen between the two clamping pieces and then turning the bolts to change the distance between the two clamping pieces, the end of the specimen is clamped. However, the staff turns the bolts with a wrench, which is a laborious process and is prone to the situation of insufficient clamping. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a clamping device for a constant displacement test of stress corrosion testing, which can use the force of stress stretching to secondarily clamp the clamp, is easy to fix, and is not prone to the situation of insufficient clamping.

[0004] In order to solve the above technical problems, the utility model adopts the following technical scheme: A clamping device for a constant displacement test of stress corrosion testing, including a stretching table and two groups of stretching mechanisms oppositely arranged on the stretching table. The stretching mechanism includes a tensile machine and a clamp connected to its stretching end. The clamp includes two opposite clamping pieces. The clamping piece includes a clamping portion and connecting portions arranged at both ends of the clamping portion. A stud is provided on the connecting portion of one clamping piece, and a through hole for the stud to pass through is provided on the connecting portion of the other clamping piece. The stud passes through the corresponding through hole and is screwed with a nut. The stretching end of the tensile machine is located between the two clamping portions and is horizontally slidably connected to the inner walls of the two clamping portions. A positioning plate is sleeved on the stretching end of the tensile machine. The positioning plate is provided with pull rods respectively located at the positions of the two nuts. One end of the pull rod away from the positioning plate is provided with a rack. Tooth rings located on the moving path of the rack are sleeved on both nuts. When the stretching end moves relative to the clamping piece, the rack and the tooth ring cooperate and mesh to drive the nut to move in a threaded manner with the stud.

[0005] As a further optimization of the clamping device for a constant displacement test of stress corrosion testing of the utility model, long strip holes are opened in the clamping portions of the two clamping pieces. A sliding block slidably arranged in the corresponding long strip hole is provided at the stretching end of the tensile machine. The end of the sliding block extends outside the long strip hole and is connected with a limiting block.

[0006] As a further optimization of the clamping device for constant displacement test of stress corrosion test of the utility model, the sliding block is cylindrical.

[0007] As a further optimization of the clamping device for constant displacement test of stress corrosion test of the utility model, the stretching end of the stretching machine is provided with a thread groove, and the end of the cylinder connected to the stretching end of the stretching machine is provided with an external thread screwed with the thread groove.

[0008] As a further optimization of the clamping device for constant displacement test of stress corrosion test of the utility model, the cross section of the clamping part is arc-shaped.

[0009] As a further optimization of the clamping device for constant displacement test of stress corrosion test of the utility model, the cross section of the clamping part is V-shaped.

[0010] As a further optimization of the clamping device for constant displacement test of stress corrosion test of the utility model, the cross section of the clamping part is rectangular.

[0011] As a further optimization of the clamping device for constant displacement test of stress corrosion test of the utility model, the clamping part and the connecting part are integrally formed.

[0012] The utility model has the following beneficial effects: in this embodiment, a slider is arranged at the stretching end of the stretching machine, and a long hole is arranged at the clamping part, so that the stretching machine is slidably connected to the clamping part, so that when the stretching machine pulls the clamp for stretching, a load-free movement will be performed. When the stretching end slides to the limit position, the stretching machine will pull the clamp to move. At the same time, a positioning plate is sleeved on the stretching end, and the positioning plate is provided with a pull rod respectively located at two nuts. A rack is provided at the end of the pull rod away from the positioning plate, and the nuts are all sleeved with a gear ring, which is located on the moving path of the rack. When the sample is not supported, the gear ring is located between the rack and the positioning plate. When the stretching end moves relative to the clamp, that is, when it moves without load, the positioning plate can move with the rack. During the movement, the rack engages with the matching transmission to drive the nut to rotate, thereby causing the nut and the stud thread to move, so that the clamp can be clamped for a second time by using the force of stress stretching, which is easy to fix and not prone to loose clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the clamping device of the utility model;

[0014] Figure 2 for Figure 1 A schematic diagram of the partially enlarged structure at center A;

[0015] Reference numerals: 1, stretching table; 2, stretching machine; 201, stretching end; 3, positioning plate; 4, clamping piece; 401, connecting portion; 402, clamping portion; 5, long slot; 6, slider; 7, pull rod; 8, nut; 9, stud; 10, toothed ring; 11, limit block; 12, rack. Detailed implementation manners

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0017] As shown in the figure, the present invention provides a clamping device for a constant displacement test of stress corrosion test, which is used to clamp and stretch a material sample that needs to be subjected to a constant displacement test of stress corrosion test, and can use the force of stress stretching to secondarily clamp the fixture, with easy fixation and not likely to occur the situation of insufficient clamping.

[0018] The same as the prior art for this clamping device: It includes a stretching table 1 and two sets of stretching mechanisms oppositely arranged on the stretching table 1. The stretching mechanism includes a stretching machine 2 and a fixture connected to its stretching end 201. The fixture is used to clamp the end of the sample. After the fixture clamps the end of the stretching machine 2, the stretching machine 2 stretches to drive the fixture to displace, so as to perform stress stretching on the sample in the clamped state.

[0019] In the present invention, the fixture includes two opposite clamping pieces 4. The clamping piece 4 includes a clamping portion 402 and connecting portions 401 arranged at both ends of the clamping portion 402. The clamping portion 402 and the connecting portions 401 are integrally formed. A stud 9 is provided on the connecting portion 401 of one clamping piece 4, and a through hole for the stud 9 to pass through is provided on the connecting portion 401 of the other clamping piece 4. The stud 9 passes through the corresponding through hole and is screwed with a nut 8. The end of the sample is placed between the two clamping portions 402, and then by turning the nut 8, the distance between the two clamping portions 402 is changed, so as to clamp the sample. In this embodiment, the cross section of the clamping portion 402 can be arc-shaped, V-shaped or rectangular. The specific selection is based on the shape of the sample.

[0020] The same as the prior art for the clamping device provided by the present invention: This clamping device can use the force of the stretching machine 2 to control the rotation of the nut 8 when the stretching machine 2 stretches, and further compress the distance between the two clamping portions 402 to tightly clamp the end of the sample.

[0021] In this embodiment, the stretching end 201 of the stretching machine 2 is located between the two clamping parts 402 and is horizontally slidably connected to the inner walls of the two clamping parts 402. The sliding connection between the clamping part 402 and the stretching end 201 enables the stretching machine 2 to perform a no-load movement when pulling the fixture for stretching. When the stretching end 201 slides to the extreme position, the stretching machine 2 will pull the fixture to move, thereby performing stretching. It should be emphasized here that during stretching, both the stretching end 201 of the stretching machine 2 and the end of the specimen are located between the two clamping parts 402. The stretching end 201 only occupies a very small space in the two clamping parts 402 and does not affect the clamping of the specimen end by the two clamping parts 402.

[0022] In this embodiment, a positioning plate 3 is sleeved on the stretching end 201 of the stretching machine 2. The positioning plate 3 is provided with pull rods 7 located at the two nuts 8 respectively. One end of the pull rod 7 away from the positioning plate 3 is provided with a rack 12. Tooth rings 10 are sleeved on both nuts 8, and the tooth rings 10 are located on the moving path of the rack 12. When the specimen is not clamped, the tooth ring 10 is located between the rack 12 and the positioning plate 3. After the specimen end is placed between the two clamping parts 402, when the stretching machine 2 drives the stretching end 201 to move relative to the clamping piece 4, that is, during the no-load movement, the movement of the positioning plate 3 can drive the rack 12 to move. During the movement of the rack 12, it meshes and drives with the tooth ring 10 to drive the nut 8 to rotate, so that the nut 8 performs a threaded movement with the stud 9 to further clamp the specimen.

[0023] In the embodiment, long slots 5 are provided in the clamping parts 402 of the two clamping pieces 4. The stretching end 201 of the stretching machine 2 is provided with sliders 6 slidably arranged in the corresponding long slots 5. One end of the slider 6 extends outside the long slot 5 and is connected with a limit block 11. The cooperation between the long slot 5 and the slider 6 enables the stretching end 201 to be slidably connected to the clamping part 402, and the limit block 11 prevents the clamping part 402 from falling off the stretching end 201.

[0024] In this embodiment, the slider 6 is cylindrical. The stretching end 201 of the stretching machine 2 is provided with a threaded groove, and one end of the cylinder connected to the stretching end 201 of the stretching machine 2 is provided with an external thread that cooperates with the threaded groove. The threaded connection between the slider 6 and the stretching end 201 facilitates the replacement and maintenance of the slider 6.

[0025] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various deformations or modifications within the scope of the claims, which does not affect the essence of the present invention.

Claims

1. A clamping device for a stress corrosion test constant displacement test, comprising a stretching platform (1) and two sets of stretching mechanisms arranged relatively on the stretching platform (1), the stretching mechanism comprising a stretching machine (2) and a clamp connected to its stretching end (201), the clamp comprising two opposite clips (4), the clip (4) comprising a clamping portion (402) and connecting portions (401) arranged at both ends of the clamping portion (402), the connecting portion (401) of one clip (4) being provided with a stud (9), the connecting portion (401) of the other clip (4) being provided with a through hole for the stud (9) to pass through, the stud (9) passing through the corresponding through hole and being screwed to a nut (8), characterized in that: The stretching end (201) of the stretching machine (2) is located between the two clamping parts (402) and is horizontally slidably connected to the inner walls of the two clamping parts (402). The stretching end (201) of the stretching machine (2) is sleeved with a positioning plate (3), and the positioning plate (3) is provided with a pull rod (7) respectively located at two nuts (8). The pull rod (7) is provided with a rack (12) at one end away from the positioning plate (3), and the nuts (8) are all sleeved with a gear ring (10) that can mesh with the rack (12).

2. A clamping device for constant displacement test of stress corrosion test according to claim 1, characterized in that: The clamping parts (402) of the two clamping pieces (4) are each provided with an elongated hole (5), and the stretching end (201) of the stretching machine (2) is provided with a slider (6) slidably arranged in the corresponding elongated hole (5), and the end of the slider (6) extends outside the elongated hole (5) and is connected to a limiting block (11).

3. A clamping device for constant displacement test of stress corrosion test according to claim 2, characterized in that: The sliding block (6) is cylindrical.

4. A clamping device for constant displacement test of stress corrosion test according to claim 3, characterized in that: The stretching end (201) of the stretching machine (2) is provided with a thread groove, and one end of the cylinder connected to the stretching end (201) of the stretching machine (2) is provided with an external thread that is threadedly connected to the thread groove.

5. The clamping device for constant displacement test of stress corrosion test according to claim 1, characterized in that: The cross section of the clamping portion (402) is arc-shaped.

6. The clamping device for constant displacement test of stress corrosion test according to claim 1, characterized in that: The cross section of the clamping portion (402) is V-shaped.

7. The clamping device for constant displacement test of stress corrosion test according to claim 1, characterized in that: The cross section of the clamping portion (402) is rectangular.

8. The clamping device for constant displacement test of stress corrosion test according to claim 1, characterized in that: The clamping portion (402) and the connecting portion (401) are integrally formed.

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