Clamping device for tension test

Abstract

The utility model discloses a clamping device for tension testing, which belongs to the testing field of tension testing machines and comprises a connecting rod and a clamping mechanism connected with the connecting rod, the clamping mechanism comprises a clamping unit used for clamping one end of a clamping piece, and the clamping unit comprises a cylinder wall mounted on the connecting rod and a fixed base connected with the cylinder wall to form a cavity. A clamping assembly is arranged in the cavity, the clamping piece penetrates through the fixing base to be connected with the clamping assembly, and an air inlet assembly for air inlet is arranged on the side wall of the air cylinder wall and used for driving the clamping assembly to clamp the clamping piece. According to the utility model, a rod-type draw hook or a test needle can be simply and conveniently clamped, the draw hook and the test needle can be rapidly changed, and the test time is saved.

Description

Technical Field

[0001] This application belongs to the field of tensile testing machine testing, and particularly relates to a clamping device for tensile testing. Background Art

[0002] In modern manufacturing, tensile testing machines are widely used as testing equipment in the semiconductor, printed circuit board assembly (PCBA), and advanced electronic packaging industries. A tensile testing machine is a precision mechanical property testing device that can apply a tensile force to a material or component and measure its response behavior under different loads, such as elasticity, plastic deformation, fracture strength, etc. In the semiconductor and PCBA industries, this device is usually used to evaluate the strength of solder joints, the reliability of connectors, and the mechanical properties of the materials themselves. Currently, when the clamping module in a tensile testing machine clamps a rod-shaped hook or test pin, it needs to be clamped by means of a threaded hook or a side-tightening set screw, etc. This method has the problem of complex installation process of the test tool.

[0003] Therefore, it is necessary to provide a clamping device that is convenient for clamping by a tensile testing machine to solve the problem that the clamping mechanism of the existing tensile testing machine has a complex installation process when clamping a rod-shaped hook or test pin. Utility Model Content

[0004] The purpose of the present utility model is to solve the problem of complex clamping process when the clamping mechanism of a tensile testing machine in the prior art clamps a rod-shaped hook or test pin.

[0005] To achieve the above purpose, the present utility model adopts the following technical solutions:

[0006] A clamping device for tensile testing includes a connecting rod and a clamping mechanism connected to the connecting rod. The clamping mechanism includes a clamping unit for clamping one end of a clamping piece. The clamping unit includes a cylinder wall installed on the connecting rod, a fixed base connected to the cylinder wall to form a cavity, a clamping assembly is arranged in the cavity, an air inlet hole for the air inlet assembly to enter air is opened on the side wall of the cylinder wall, and is used to drive the clamping assembly to clamp the clamping piece.

[0007] Further, the clamping assembly specifically includes: a plurality of clamping jaws arranged circumferentially along the connecting rod on the fixed base for clamping the clamping piece; a slider arranged circumferentially along the connecting rod on the fixed base for pushing the clamping jaws to move in the direction of clamping the clamping piece; a movable piston sleeved on the connecting rod and moving along the axis direction of the connecting rod; wherein, a first conical surface is arranged on the part of the movable piston sleeved on the connecting rod close to the fixed base, and a second conical surface that is in shape-matching with the conical surface is arranged on the part of the slider close to the connecting rod, and the movable piston drives the slider to move through the first conical surface and the second conical surface.

[0008] Furthermore, a fixing ring covering the clamping jaws and the slider is also provided on the fixing base.

[0009] Furthermore, an annular groove is formed in the end face of the movable piston close to the fixing ring, and an elastic member connected to the fixing ring is provided in the annular groove.

[0010] Furthermore, a guiding groove for the slider to slide is provided on the fixing base for the slider to slide along the guiding direction of the guiding groove.

[0011] Furthermore, a first sealing ring is provided between the connecting rod and the cylinder wall of the clamping unit.

[0012] Furthermore, a second sealing ring is provided at the connection position between the movable piston and the connecting rod; a third sealing ring is provided at the connection position between the movable piston and the cylinder wall.

[0013] Furthermore, a pre-fixer for the clamping member is further provided at one end of the connecting rod close to the clamping mechanism.

[0014] Compared with the prior art, the present utility model has the following beneficial effects:

[0015] Through a tensile test clamping device provided by the present application, it is possible to simply clamp a rod-shaped hook or a test needle. The hook and the test needle can be quickly changed, saving test time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the tensile test clamping device provided by the present utility model;

[0017] Figure 2 is a schematic cross-sectional view A-A of the tensile test clamping device provided by the present utility model;

[0018] Figure 3 is a schematic diagram of the movable piston provided by the present utility model;

[0019] Figure 4 is a schematic cross-sectional view B-B of the movable piston provided by the present utility model;

[0020] Figure 5 is a schematic diagram of the clamping assembly provided by the present utility model with the movable piston and the fixing ring removed;

[0021] Reference numerals in the figure: 100, tensile test clamping device; 1, connecting rod; 2, clamping mechanism; 21, clamping unit; 211, cylinder wall; 2111, air inlet hole; 212, fixed base; 2121, guide groove; 213, clamping assembly; 2131, jaw; 2132, slider; 2133, movable piston; 21331, annular groove; 2134, first sealing ring; 2135, second sealing ring; 2136, third sealing ring; 2137, first conical surface; 2138, second conical surface; 2139, fixing ring; 2140, elastic member; 23, clamping member; 24, pre-fixer; 25, air inlet assembly. Detailed implementation

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0023] Referring to Figure 1 and Figure 2 , the present application provides a tensile test clamping device 100, including a connecting rod 1 and a clamping mechanism 2 connected to the connecting rod 1. In an actual application scenario, one end of the connecting rod 1 is connected to the tensile test module of a push-pull force test machine, and the other end of the connecting rod 1 is connected to the clamping mechanism 2. The clamping mechanism 2 includes a clamping unit 21 for clamping a clamping member 23. The present application mainly aims to improve the clamping unit 21 to facilitate the clamping of the clamping member 23. It should be noted that the clamping member 23 can be a rod-shaped hook needle or a copper needle for hot-drawing balls.

[0024] Specifically, the clamping unit 21 includes a cylinder wall 211 installed on the connecting rod 1, a fixed base 212 connected to the cylinder wall 211 to form a cavity, and a clamping assembly 213 is provided in the cavity. The cylinder wall 211 is threadedly connected to the connecting rod 1, and a first sealing ring 2134 is provided between the connecting rod 1 and the cylinder wall 211 of the clamping unit 21. The cylinder wall 211 is threadedly connected to the fixed base 212.

[0025] As Figure 5 shown, the clamping assembly 213 includes: a plurality of jaws 2131 arranged circumferentially along the connecting rod 1 on the fixed base 212 for clamping the clamping member 23; a slider 2132 arranged circumferentially along the connecting rod 1 on the fixed base 212 for pushing the jaws 2131 to move in the direction of clamping the clamping member 23; a movable piston 2133 sleeved on the connecting rod 1 and moving along the axis of the connecting rod 1; as Figure 3 , Figure 4As shown, the movable piston 2133 is sleeved on the connecting rod 1, and a first conical surface 2137 is provided at a portion close to the fixed base 212. A second conical surface 2138 that cooperates with the first conical surface 2137 is provided at a portion of the slider 2132 close to the connecting rod 1. The movable piston 2133 drives the slider 2132 to move through the first conical surface 2137 and the second conical surface 2138.

[0026] Specifically, a plurality of jaws 2131 are arranged on the fixed base 212 along the circumferential direction of the connecting rod 1. Here, the jaws 2131 are fixedly connected to the fixed base 212. Preferably, the number of the jaws 2131 in this application is 3, and the clamping member 23 is clamped by the 3 jaws 2131. The slider 2132 is arranged on the fixed base 212 along the circumferential direction of the connecting rod 1 and is used to push the jaws 2131 to move in the direction of clamping the clamping member 23. Preferably, the number of the sliders 2132 in this application is 3, and the jaws 2131 are pushed by the 3 sliders 2132 to clamp the clamping member 23. A guiding groove 2121 for the slider 2132 to slide is provided on the fixed base 212, and the slider 2132 slides along the guiding direction of the guiding groove 2121. It can be understood that by the slider 2132 sliding along the guiding direction of the guiding groove 2121, the jaws 2131 are further pushed to clamp the clamping member 23. It can be understood that the guiding direction of the guiding groove 2121 is the same as the direction in which the jaws 2131 clamp the clamping member 23. The movable piston 2133 is sleeved on the connecting rod 1, and the movable piston 2133 is provided with the first conical surface 2137 and the second conical surface 2138 that cooperates with the first conical surface 2137. It can be understood that when the movable piston 2133 moves on the connecting rod 1 and contacts the slider 2132, with the extrusion of the first conical surface 2137 on the second conical surface 2138, the linear movement of the movable piston 2133 along the connecting rod 1 is converted into the movement of the slider 2132 along the guiding groove 2121, and further the jaws 2131 are pushed to clamp the clamping member 23.

[0027] It should be noted that, in order to realize the movement of the movable piston 2133, an air inlet hole 2111 is opened on the cylinder wall 211 for the air inlet assembly 25 to intake air and drive the movable piston 2133 to move, so as to finally realize the clamping of the clamping member 23 by the jaws 2131. In order to ensure that the air inlet assembly 25 intakes air to drive the movable piston 2133, it is also necessary to ensure that a sealed chamber is formed between the movable piston 2133 and the connecting rod 1. In this application, a second sealing ring 2135 is provided at the connection position between the movable piston 2133 and the connecting rod 1, and a third sealing ring 2136 is provided at the connection position between the movable piston 2133 and the cylinder wall 211. Through the sealing of the above-mentioned first sealing ring 2134, second sealing ring 2135, and third sealing ring 2136, the sealing performance between the movable piston 2133 and the cylinder wall 211 is ensured, and further the air inlet assembly 25 intakes air to drive the movable piston 2133.

[0028] It should also be noted that, on the basis of being able to move the movable piston 2133 to clamp the clamping member 23, it is also necessary for the movable piston 2133 to move to release the clamping member to ensure that the clamping member 23 is pushed out of the clamping assembly 213. Specifically, the movable piston 2133 is provided with an annular groove 21331 on the end face close to the fixed ring 2139. The fixed base 212 is also provided with a fixed ring 2139 covering the jaw 2131 and the slider 2132. The fixed ring 2139 is mainly used to keep the slider 2132 from falling off. An elastic member 2140 connected to the fixed ring 2139 is arranged in the annular groove 21331. When the air intake assembly 25 does not work, the movable piston 2133 is pushed out by the elastic member 2140 and moves in a direction away from the fixed base 212. At the same time, the slider 2132 is ejected under the elastic force of the jaw 2131. It should be noted that the jaw 2131 described here has the ability of elastic deformation through a special structural shape design.

[0029] It should also be noted that, in addition to the clamping member 23 passing through the fixed base 212 and being connected to the clamping assembly 213, in order to ensure that the clamping member 23 can be clamped and not fall off when initially inserted into the fixed base 212, a pre - fixer 24 for the clamping member 23 is also provided at one end of the connecting rod 1 close to the clamping mechanism 2. The pre - fixer 24 is made of an elastic material.

[0030] The working principle of the present invention is specifically as follows:

[0031] The connecting rod 1 is threadedly connected to the cylinder wall 211, and the first sealing ring 2134 is fixed between them. The second sealing ring 2135 and the third sealing ring 2136 are installed on the movable piston 2133, and the movable piston 2133 can slide in the connecting rod 1 and the cylinder wall 211. The intake assembly 25 can ventilate to the sealed chamber between the movable piston 2133 and the cylinder wall 211 through the intake hole 2111. The fixed base 212 is fixedly connected to the cylinder wall 211 by screws. The cylinder wall 211, the movable piston 2133, the first sealing ring 2134, the second sealing ring 2135, the third sealing ring 2136, the intake assembly 25 and the intake hole 2111 form a single-acting cylinder. When ventilated, the movable piston 2133 can move towards the position close to the fixed base 212. After the air supply is cut off, the movable piston 2133 is reset under the action of the elastic member 2140. The jaw 2131 is fixedly connected to the fixed base 212. The slider 2132 can slide on the guide groove 2121 of the fixed base 212, and the fixing ring 2139 keeps the slider 2132 from falling off. The first tapered surface 2137 of the slider 2132 contacts the second tapered surface 2138 of the movable piston 2133. When the movable piston 2133 moves downward under air pressure, it pushes the slider 2132 and the jaw 2131 connected to the slider 2132 to move, thereby realizing the deformation of the jaw 2131 and clamping the clamping member. Here, the clamping member is a rod-shaped crochet hook. After the air pressure is removed, the movable piston 2133 is reset under the action of the elastic member 2140, releasing the slider 2132. The slider 2132 is pushed out under the elastic force of the jaw 2131. When there is no air pressure, the middle hole formed by the three jaws 2131 is larger than the diameter of the clamping member. Under air pressure, the middle hole formed after the jaws 2131 are closed is smaller than the diameter of the pull rod of the clamping member, clamping the pull rod. The pre-fixer 24 is fixedly installed on the mounting rod and is made of an elastic material. The inner hole diameter is smaller than the diameter of the pull rod of the clamping member. When the clamping member is inserted, the hook can be kept from falling off, facilitating the subsequent clamping action of the jaw 2131.

[0032] As described above, it is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A tension test clamping device, comprising a connecting rod and a clamping mechanism connected to the connecting rod, characterized in that: The clamping mechanism includes a clamping unit for clamping one end of the clamping piece, the clamping unit includes a cylinder wall installed on the connecting rod, a fixed base connected to the cylinder wall to form a cavity, a clamping assembly is provided in the cavity, the clamping piece passes through the fixed base and is connected to the clamping assembly, and an air intake hole for air intake of the air intake assembly is opened on the side wall of the cylinder wall, which is used to drive the clamping assembly to clamp the clamping piece.

2. The tension test clamping device according to claim 1, characterized in that: The clamping assembly specifically comprises: A plurality of clamping claws arranged on the fixed base along the circumference of the connecting rod and used for clamping the clamping member; A slider disposed on the fixed base along the circumference of the connecting rod and used to push the clamping claw to move in the direction of the clamping member; A movable piston sleeved on the connecting rod and movable along the axis of the connecting rod; Among them, the movable piston is sleeved on the connecting rod and is close to the fixed base with a first conical surface, and the sliding block is close to the connecting rod and is provided with a second conical surface matching the first conical surface. The movable piston drives the sliding block to move through the first conical surface and the second conical surface.

3. The tension test clamping device according to claim 2, characterized in that: A fixing ring covering the clamping claws and the sliding block is also provided on the fixing base.

4. The tension test clamping device according to claim 3, characterized in that: The movable piston is provided with an annular groove on the end surface close to the fixing ring, and an elastic member connected with the fixing ring is arranged in the annular groove.

5. The tension test clamping device according to claim 1, characterized in that: The fixed base is provided with a guide groove for the sliding block to slide, and the sliding block is used to slide along the guiding direction of the guide groove.

6. The tension test clamping device according to claim 1, characterized in that: A first sealing ring is arranged between the connecting rod and the cylinder wall of the clamping unit.

7. The tension test clamping device according to claim 2, characterized in that: A second sealing ring is provided at the position where the movable piston is connected to the connecting rod; and a third sealing ring is provided at the position where the movable piston is connected to the cylinder wall.

8. The tension test clamping device according to claim 1, characterized in that: One end of the connecting rod close to the clamping mechanism is also provided with a pre-fixer for a clamping member.

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