A clamp for tensile testing of rebar

Abstract

This utility model belongs to the field of rebar testing technology, specifically a fixture for tensile testing of rebar, including a fixture body; multiple air cylinders are fixedly connected to the side wall of the fixture body; the air cylinders are evenly distributed on the side wall of the fixture body and have the same structure; a piston rod is slidably connected to the inner side wall of the air cylinder; the movement of the screw will push the support plate to move towards the air cylinder, and can also be pushed by external force to move the support plate towards the air cylinder; the airflow directionally sprayed from the air pipe can blow away rust, dust, metal debris and impurities on the surface of the screw. The pneumatic cleaning method does not require contact with the screw surface, avoiding mechanical friction that could damage the thread structure and protecting the screw's precision. Multiple evenly distributed air pipes can cover different parts of the screw, ensuring thorough cleaning. The spring-driven reciprocating structure enables convenient operation during use, improves cleaning speed, and adapts to the rapid cleaning needs of high-frequency testing scenarios.

Description

Technical Field

[0001] This utility model belongs to the field of threaded steel testing technology, specifically a fixture for tensile testing of threaded steel. Background Technology

[0002] As a hot-rolled ribbed steel bar, rebar is widely used in the skeleton of reinforced concrete structures in building engineering due to its high strength and good bending resistance.

[0003] Currently, most tensile tests on rebar are conducted using a general-purpose tensile testing machine. First, the rebar is fixed and clamped by a clamp. The clamp is mainly used to rotate the screws on both sides to bring the clamping blocks closer together and make them fit tightly against the rebar, thereby achieving the clamping and fixing effect.

[0004] However, in the existing technology, the fixture is generally exposed to the outside world when in use. Dust and impurities from the outside world can easily adhere to the screw surface on the side wall of the fixture, which can cause corrosion over time, affecting the service life. It can also affect the rotation of the thread and the stability of the threaded steel. Therefore, a fixture for tensile testing of threaded steel is proposed to address the above problems. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model proposes a fixture for tensile testing of threaded steel.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: A clamp for tensile testing of threaded steel bars, comprising a clamp body; a plurality of air cylinders are fixedly connected to the side wall of the clamp body; the air cylinders are evenly distributed on the side wall of the clamp body and have the same structure; a piston rod is slidably connected to the inner side wall of the air cylinder; a support plate is fixedly connected to the end of the piston rod; a spring is fixedly connected between the support plate and the air cylinder; a connecting pipe is fixedly connected to the side wall of the air cylinder; a plurality of air blowing pipes are evenly fixedly connected to the side wall of the connecting pipe.

[0007] Preferably, the clamp body has multiple slide rails fixedly connected to its side wall; the slide rails are evenly distributed on the side wall of the clamp body and have the same structure; a fixing block is slidably connected to the inner side wall of the slide rail; the fixing block is fixedly connected to the air cylinder; a pair of elastic plates are symmetrically fixedly connected to the side wall of the slide rail; the elastic plates are arranged in an arc shape.

[0008] Preferably, a spring rod is fixedly connected to the side wall of the air cylinder; a fixing plate is fixedly connected to the end of the spring rod; a plurality of cleaning brushes are uniformly fixedly connected to the side wall of the fixing plate; a connecting rod is fixedly connected to the side wall of the cleaning brush; the connecting rod passes through the wall of the cleaning brush and is fixedly connected to it.

[0009] Preferably, the slide rail sidewall is hinged with a locking block; the fixing block sidewall is provided with a locking groove; the locking block and the locking groove are positioned correspondingly.

[0010] Preferably, a lever plate is fixedly connected to the side wall of the card block; and multiple anti-slip pads are uniformly fixedly connected to the side wall of the lever plate.

[0011] Preferably, the side wall of the support plate has a through hole; a roller is rotatably connected to the side wall of the through hole.

[0012] The beneficial effects of this utility model are: 1. This utility model provides a fixture for tensile testing of threaded steel bars. Through the setting of air cylinder and air blowing pipe, the pneumatic cleaning method does not need to contact the surface of the screw, avoiding mechanical friction that could damage the thread structure and protecting the screw precision. Multiple evenly distributed air blowing pipes can cover different parts of the screw, ensuring no dead corners in cleaning. The spring-driven reciprocating structure enables convenient operation during use, improves cleaning speed, and adapts to the rapid cleaning needs of high-frequency testing scenarios.

[0013] 2. This utility model provides a clamp for tensile testing of threaded steel bars. The fixed block and the cooperation between the slide rail and the fixed block increase the convenience of disassembling and installing the air cylinder, improve the function of disassembling and maintaining the air cylinder, and at the same time, also increase the function of disassembling and collecting the air cylinder, thereby improving the flexibility and practicality of the air cylinder. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view of the spring in this utility model; Figure 3 This is a perspective view of the connecting pipe in this utility model; Figure 4 This is a perspective view of the card block in this utility model.

[0015] Legend: 1. Fixture body; 11. Air cylinder; 12. Piston rod; 13. Support plate; 14. Spring; 15. Connecting pipe; 16. Air blowing pipe; 2. Slide rail; 21. Fixing block; 22. Elastic plate; 3. Spring rod; 31. Fixing plate; 32. Cleaning brush; 33. Connecting rod; 4. Locking block; 41. Locking groove; 5. Pulley; 51. Anti-slip pad; 6. Through hole; 61. Roller. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0017] Specific implementation examples are given below.

[0018] Please see Figures 1-4 This utility model provides a fixture for tensile testing of rebar, including a fixture body 1; multiple air cylinders 11 are fixedly connected to the side wall of the fixture body 1; the air cylinders 11 are evenly distributed on the side wall of the fixture body 1 and have the same structure; a piston rod 12 is slidably connected to the inner side wall of the air cylinder 11; a support plate 13 is fixedly connected to the end of the piston rod 12; a spring 14 is fixedly connected between the support plate 13 and the air cylinder 11; a connecting pipe 15 is fixedly connected to the side wall of the air cylinder 11; multiple air blowing pipes 16 are evenly fixedly connected to the side wall of the connecting pipe 15; in use, when the screw on the side wall of the fixture body 1 is rotated, the movement of the screw will push the support plate 13 to move towards the air cylinder 11, and at the same time, an external force can be used to push the support plate 13 to move towards the air cylinder 11, driving the piston rod 12 along the air cylinder 11. The inner wall slides and compresses the spring 14. The gas in the air cylinder 11 is delivered to multiple air blowing pipes 16 through the connecting pipe 15. After the branch plate 13 is released, the spring 14 returns to its elastic deformation, pulling the piston rod 12 to reset. The air cylinder 11 replenishes the gas by inhaling air, completing one pneumatic cycle. The airflow sprayed directionally from the air blowing pipes 16 can blow away rust, dust, metal debris and impurities from the screw surface, achieving cleaning. In this process, the pneumatic cleaning method does not need to contact the screw surface, avoiding mechanical friction that could damage the thread structure and protecting the screw's precision. Multiple evenly distributed air blowing pipes 16 can cover different parts of the screw, ensuring no dead angles in cleaning. The reciprocating structure driven by the spring 14 enables convenient operation during use, improves cleaning speed, and adapts to the rapid cleaning needs of high-frequency testing scenarios.

[0019] Furthermore, such as Figures 1-4As shown, multiple slide rails 2 are fixedly connected to the side wall of the clamp body 1; the slide rails 2 are evenly distributed on the side wall of the clamp body 1 and have the same structure; a fixing block 21 is slidably connected to the inner side wall of the slide rail 2; the fixing block 21 is fixedly connected to the air cylinder 11; a pair of elastic plates 22 are symmetrically fixed to the side wall of the slide rail 2; the elastic plates 22 are arc-shaped; in use, the fixing block 21 is pushed to slide along the inner side wall of the slide rail 2, and the fixing block 21 will squeeze and push open the elastic plate 22. At the same time, by utilizing the tilt angle of the elastic plate 22, the fixing block 21 can slide towards the middle of the two elastic plates 22. After being fully inserted, the elastic plate 22 can quickly reset and abut against the side wall of the fixing block 21, thereby realizing the installation and fixation of the air cylinder 11. In this process, the cooperation between the slide rail 2 and the fixing block 21 increases the convenience of disassembling and installing the air cylinder 11, improves the function of disassembling and maintaining the air cylinder 11, and also increases the function of disassembling and collecting the air cylinder 11, improving the flexibility and practicality of using the air cylinder 11.

[0020] Furthermore, such as Figures 1-4 As shown, a spring rod 3 is fixedly connected to the side wall of the air cylinder 11; a fixing plate 31 is fixedly connected to the end of the spring rod 3; multiple cleaning brushes 32 are evenly fixedly connected to the side wall of the fixing plate 31; a connecting rod 33 is fixedly connected to the side wall of the cleaning brush 32; the connecting rod 33 passes through the wall of the cleaning brush 32 and is fixedly connected to it; during use, while performing pneumatic cleaning, the spring rod 3 pushes the fixing plate 31 closer to the screw, so that the cleaning brushes 32 contact the surface of the screw. When the screw rotates and moves, the cleaning brushes 32 mechanically clean stubborn impurities in the screw thread gap. The airflow from the air pipe 16 blows away the cleaned impurities. The connecting rod 33 passes through the cleaning brush 32 and connects to the fixing plate 31, enhancing the structural strength of the cleaning brush 32. During this process, the synergistic effect of mechanical cleaning and pneumatic blowing greatly improves the cleaning effect, especially for stubborn impurities in the thread gaps, solving the problem of incomplete cleaning by pure pneumatic cleaning. The elastic buffering effect of the spring rod 3 keeps the cleaning brush 32 in contact with the screw surface, while reducing excessive compression that causes bristle wear. The connecting rod 33 enhances the firmness of the cleaning brush 32 and extends its service life.

[0021] Furthermore, such as Figures 1-4As shown, the slide rail 2 has a locking block 4 hinged to its side wall; the fixing block 21 has a locking groove 41 on its side wall; the locking block 4 and the locking groove 41 are positioned correspondingly; in use, first hold the locking block 4 and pull it. After pulling it open, when the fixing block 21 slides along the slide rail 2 to the target position, the locking block 4 can be released directly. At this time, it will automatically reset under the action of the internal torsion spring at the hinge of the locking block 4. The locking block 4 is embedded in the locking groove 41 on the side wall of the fixing block 21, and a certain force is applied to fix the fixing block 21. In this process, the rigid locking cooperation between the locking block 4 and the locking groove 41 is more stable than the fixing method that relies solely on friction. It is especially suitable for cleaning operations in vibration environments. The locking structure is simple and reliable, which increases the stability of the air cylinder 11 during use.

[0022] Furthermore, such as Figures 1-4 As shown, a lever plate 5 is fixedly connected to the side wall of the locking block 4; multiple anti-slip pads 51 are evenly fixed to the side wall of the lever plate 5; in use, the locking block 4 can be rotated synchronously by moving the lever plate 5, thereby separating the locking block 4 from the locking slot 41. The multiple anti-slip pads 51 on the side wall of the lever plate 5 increase the friction between the hand and the lever plate 5, reducing slippage during operation. In this process, the lever plate 5 extends the lever arm, making the rotation operation of the locking block 4 easier and improving the adjustment speed. The anti-slip pads 51 ensure operational stability, reduce the slippage effect caused by slippage, and protect the operator's hands, thereby improving operational safety.

[0023] Furthermore, such as Figures 1-4 As shown, the side wall of the support plate 13 has a through hole 6; a roller 61 is rotatably connected to the side wall of the through hole 6; in use, when the screw rotates to push the support plate 13, the roller 61 in the through hole 6 contacts the screw, converting sliding friction into rolling friction, reducing the resistance when the support plate 13 moves. The roller 61 can rotate synchronously with the support plate 13 to ensure smooth pushing process. During this process, the roller 61 significantly reduces the pushing resistance of the support plate 13, making it easier for operators to complete the pressing action of pneumatic cleaning. At the same time, rolling friction reduces component wear and extends the service life of the support plate 13.

[0024] Working principle: During use, rotating the screw on the side wall of the clamp body 1 moves the support plate 13 towards the air cylinder 11. Simultaneously, external force can push the support plate 13 towards the air cylinder 11, causing the piston rod 12 to slide along the inner wall of the air cylinder 11 and compress the spring 14. The gas inside the air cylinder 11 is transported to multiple air blowing pipes 16 via the connecting pipe 15. After releasing the support plate 13, the spring 14 returns to its elastic deformation, pulling the piston rod 12 back to its original position. The air cylinder 11 replenishes gas by drawing in air, completing one pneumatic cycle. The air blowing pipes 16 then spray gas in a directional manner. The airflow can blow away rust, dust, metal debris, and other impurities from the screw surface, achieving cleaning. During use, pushing the fixing block 21 along the inner wall of the slide rail 2 causes the fixing block 21 to press against and push open the elastic plate 22. Simultaneously, utilizing the tilt angle of the elastic plate 22, the fixing block 21 can slide towards the middle of the two elastic plates 22. After full insertion, the elastic plate 22 can quickly return to its original position and abut against the side wall of the fixing block 21, thus securing the air cylinder 11. During use, while performing pneumatic cleaning, the spring rod 3 pushes the fixing plate 31 closer to the screw, causing the cleaning brush to... The cleaning brush 32 contacts the screw surface. When the screw rotates and moves, the cleaning brush 32 mechanically cleans stubborn impurities in the screw thread gap. Combined with the airflow from the air pipe 16, the cleaned impurities are blown away. The connecting rod 33 passes through the cleaning brush 32 and connects to the fixing plate 31, enhancing the structural strength of the cleaning brush 32. In use, first grasp the locking block 4 and pull it. After pulling it open, when the fixing block 21 slides along the slide rail 2 to the target position, the locking block 4 can be released directly. At this time, it will automatically reset under the action of the internal torsion spring at the hinge of the locking block 4, and the locking block 4 will embed into the side of the fixing block 21. The fixed block 21 can be fixed by applying a certain force to the slot 41 in the wall. In use, the block 4 can be rotated synchronously by moving the lever 5, so that the block 4 can be separated from the slot 41. Multiple anti-slip pads 51 on the side wall of the lever 5 increase the friction between the hand and the lever 5, reducing slippage during operation. In use, when the screw rotates and pushes the support plate 13, the roller 61 in the through hole 6 contacts the screw, converting sliding friction into rolling friction, reducing the resistance when the support plate 13 moves. The roller 61 can rotate synchronously with the support plate 13 to ensure smooth pushing process.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A clamp for thread steel tensile detection, comprising a clamp body (1); characterized in that: Multiple air cylinders (11) are fixedly connected to the side wall of the clamp body (1); the air cylinders (11) are evenly distributed on the side wall of the clamp body (1) and have the same structure; a piston rod (12) is slidably connected to the inner side wall of the air cylinder (11); a support plate (13) is fixedly connected to the end of the piston rod (12); a spring (14) is fixedly connected between the support plate (13) and the air cylinder (11); a connecting pipe (15) is fixedly connected to the side wall of the air cylinder (11); multiple air blowing pipes (16) are evenly fixedly connected to the side wall of the connecting pipe (15).

2. The clamp for thread steel tension detection according to claim 1, characterized in that: The clamp body (1) has multiple slide rails (2) fixedly connected to its side wall; the slide rails (2) are evenly distributed on the side wall of the clamp body (1) and have the same structure; the inner side wall of the slide rail (2) is slidably connected to a fixing block (21); the fixing block (21) is fixedly connected to the air cylinder (11); a pair of elastic plates (22) are symmetrically fixedly connected to the side wall of the slide rail (2); the elastic plates (22) are arranged in an arc shape.

3. The clamp for thread steel tensile test according to claim 1, characterized in that: A spring rod (3) is fixedly connected to the side wall of the air cylinder (11); a fixing plate (31) is fixedly connected to the end of the spring rod (3); a plurality of cleaning brushes (32) are evenly fixedly connected to the side wall of the fixing plate (31); a connecting rod (33) is fixedly connected to the side wall of the cleaning brush (32); the connecting rod (33) penetrates the wall of the cleaning brush (32) and is fixedly connected to it.

4. The clamp for thread steel tension detection according to claim 2, characterized in that: The slide rail (2) has a locking block (4) hinged to its side wall; the fixing block (21) has a locking groove (41) on its side wall; the locking block (4) and the locking groove (41) are positioned opposite each other.

5. The clamp for thread steel tension detection according to claim 4, characterized in that: The side wall of the card block (4) is fixedly connected to a lever plate (5); the side wall of the lever plate (5) is evenly fixed with multiple anti-slip pads (51).

6. The clamp for thread steel tensile test according to claim 1, characterized in that: The side wall of the support plate (13) is provided with a through hole (6); a roller (61) is rotatably connected to the side wall of the through hole (6).

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