Large-tonnage pneumatic tensile test clamp

Abstract

The utility model discloses a large-tonnage pneumatic tensile test fixture which comprises a connecting device, and a clamping device is arranged at the bottom of the connecting device; the connecting device comprises a connector, a gap nut is arranged at the bottom of the connector, a top cover is fixedly arranged below the connector, a first air channel is formed in one side of the top cover, and a first connecting groove is formed in the outer side of the first air channel; according to the large-tonnage pneumatic tensile test fixture disclosed by the utility model, the problem that a conventional large-tonnage hydraulic tensile test fixture needs to be matched with a high-pressure oil station for use is solved through the design that the piston is driven to move by air blowing of the air pump, the noise generated during use is reduced, and meanwhile, the heating value and the maintenance cost are reduced; by means of a wedge-shaped self-locking material clamping mode, a sample with the tensile force not smaller than ton can be clamped only by applying small pre-pressure, so that the device can be suitable for tensile tests of metal and reinforced composite plates and bars, and the clamping stability of the device is higher.

Description

Technical Field

[0001] The utility model belongs to the technical field of tensile test fixture design, in particular to a large-tonnage pneumatic tensile test fixture. Background Art

[0002] Material tensile testing is a common experimental method used to evaluate the mechanical properties of materials, especially their tensile strength and ductility. In the experiment, a tensile testing machine is usually used to apply gradually increasing tensile force to the material sample, while recording the changes in stress and strain. Through the experimental data, the stress-strain curve of the material can be obtained to evaluate the strength, hardness, ductility and other properties of the material. Tensile testing is very important for material engineering, material selection, and product developers to determine the performance of materials under different loads, thereby ensuring the safety and reliability of the product.

[0003] Existing large-tonnage tensile clamps are all hydraulic and need to be used with a high-pressure oil station. Compared with air pumps, hydraulic oil stations are noisy, generate high heat after long-term use, and have high maintenance costs. Utility Model Content

[0004] The utility model aims to provide a large-tonnage pneumatic tensile test fixture to solve the problems existing in the above-mentioned background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A large-tonnage pneumatic tensile test fixture comprises a connecting device, wherein a clamping device is arranged at the bottom of the connecting device; the connecting device comprises a joint, wherein a clearance nut is arranged at the bottom of the joint, a top cover is fixedly arranged under the joint, a first air channel is arranged on one side of the top cover, a first connecting groove is arranged on the outer side of the first air channel, a piston is arranged at the bottom of the top cover, and a push rod is fixedly arranged at the bottom of the piston; the clamping device comprises a base, an air cavity is arranged on the top of the base, a second air channel is arranged on one side of the base, a second connecting groove is arranged on the outer side of the second air channel, a wedge-shaped clamp body is fixedly arranged at the bottom of the base, two wedge-shaped clamp blocks are symmetrically and slidably arranged on the inner side of the wedge-shaped clamp body, two clamp block baffles are symmetrically arranged on the front and rear sides of the wedge-shaped clamp block, and two handles are symmetrically arranged on the outer side of the base.

[0007] Furthermore: the joint and the top cover are integrally formed.

[0008] Furthermore: the first airway and the second airway are both L-shaped.

[0009] Furthermore: the piston is slidably connected to the base.

[0010] Furthermore: the wedge-shaped clamp is integrally formed with the base, and the top cover is bolted to the base.

[0011] Furthermore, the clamp block baffle is L-shaped, and the clamp block baffle is connected to the wedge-shaped clamp by bolts.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. When in use, the air pump sends gas into the first air channel and extracts gas from the second air channel, driving the piston to move down along the air cavity under the action of air pressure, driving the push rod to move downward at the same time, and the push rod pushes the wedge-shaped clamp block to produce a downward trend. The wedge clamp specifically converts the direction of force into the horizontal direction, so the two wedge-shaped clamp blocks move inward at the same time to clamp the material to be tested in the middle of the clamp block. The clamp block baffle ensures that the wedge-shaped clamp block will not move forward and backward. The external power source pulls the joint to drive the overall movement, stretching the material to be tested to complete the experiment. The design of driving the piston to move by the air pump solves the problem that conventional large-tonnage hydraulic tensile clamps need to be used with a high-pressure oil station, reduces the noise generated during use, and reduces heat and maintenance costs;

[0014] 2. By using the wedge-shaped self-locking clamping method, only a small pre-pressure is required to clamp the sample with a tensile force of not less than tons, so that the device can be used for tensile tests of metal and reinforced composite material plates and bars, and the clamping stability of the device is stronger. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 It is a structural schematic diagram of a large-tonnage pneumatic tensile test fixture described in the utility model;

[0017] Figure 2 It is a front view of a large-tonnage pneumatic tensile test fixture described in the utility model;

[0018] Figure 3 It is a partial cross-sectional view of a large-tonnage pneumatic tensile test fixture described in the utility model;

[0019] Figure 4 It is a partial cross-sectional view of a connecting device of a large-tonnage pneumatic tensile test fixture described in the utility model;

[0020] Figure 5It is a partial cross-sectional view of a clamping device of a large-tonnage pneumatic tensile test fixture described in the utility model.

[0021] In the accompanying drawings, the following are numerals: 1. connecting device; 101. joint; 102. clearance nut; 103. top cover; 104. first air passage; 105. first connecting groove; 106. piston; 107. push rod; 2. clamping device; 201. base; 202. air cavity; 203. second air passage; 204. second connecting groove; 205. wedge-shaped clamp body; 206. wedge-shaped clamp block; 207. clamp block baffle; 208. handle. DETAILED DESCRIPTION

[0022] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-Figure 5A large-tonnage pneumatic tensile test fixture comprises a connecting device (1), wherein a clamping device (2) is arranged at the bottom of the connecting device (1).

[0026] In this embodiment: the connection device (1) comprises a joint (101), a gap nut (102) is provided at the bottom of the joint (101), a top cover (103) is fixedly provided below the joint (101), a first air channel (104) is provided on one side of the top cover (103), a first connecting groove (105) is provided on the outer side of the first air channel (104), a piston (106) is provided at the bottom of the top cover (103), a push rod (107) is fixedly provided at the bottom of the piston (106), the joint (101) and the top cover (103) are integrally formed, the piston (106) is slidably connected to the base (201), the top cover 103 is fixed to the base 201 by bolts, the piston 106 is located in the air cavity 202, the joint 101 is connected to an external power source, and the first connecting groove 105 and the second connecting groove 204 are respectively connected to the air pump;

[0027] In this embodiment, the clamping device (2) comprises a base (201), the top of the base (201) is provided with an air cavity (202), one side of the base (201) is provided with a second air channel (203), the outer side of the second air channel (203) is provided with a second connecting groove (204), a wedge-shaped clamp body (205) is fixedly provided at the bottom of the base (201), two wedge-shaped clamp blocks (206) are symmetrically slidably provided inside the wedge-shaped clamp body (205), and the wedge-shaped clamp blocks (206) face each other front and back. The invention relates to a device for producing a plurality of air flow passages, wherein the plurality of air flow passages (104) and the plurality of air flow passages (203) are provided with two clamping block baffles (207), the outer side of the base (201) is symmetrically provided with two handles (208), the first air passage (104) and the second air passage (203) are both L-shaped, the wedge-shaped clamp body (205) and the base (201) are integrally formed, the top cover (103) and the base (201) are bolted together, the clamping block baffle (207) is L-shaped, the clamping block baffle (207) and the wedge-shaped clamp body (205) are bolted together, and the air pump sends gas into the air flow passages. The first air channel 104 simultaneously extracts gas from the second air channel 203, driving the piston 106 to move downward along the air cavity 202 under the action of air pressure, driving the push rod 107 to move downward at the same time, and the push rod 107 pushes the wedge clamp 206 to produce a downward movement trend, and the wedge clamp body 205 converts the direction of the force into the lateral direction, so the two wedge clamps 206 move inward at the same time to clamp the material to be tested between the clamps, and the clamp block baffle 207 ensures that the wedge clamp 206 will not move forward and backward. The external power source pulls the joint 101 to drive the overall movement, and the material to be tested is stretched to complete the experiment. The design of driving the piston 106 to move by blowing air with an air pump solves the problem that conventional large-tonnage hydraulic tensile clamps need to be used in conjunction with a high-pressure oil station, reduces the noise generated during use, and reduces the heat generation and maintenance costs. By using the wedge self-locking clamping material method, only a small pre-pressure is required to clamp the sample with a tensile force of not less than 30 tons, so that the device can be used for tensile tests of metal and reinforced composite material plates and bars, and the device has stronger clamping stability.

[0028] Working principle: the top cover 103 is fixed to the base 201 by bolts, the piston 106 is located in the air cavity 202, the joint 101 is connected to the external power source, the first connecting groove 105 and the second connecting groove 204 are respectively connected to the air pump. When in use, the air pump sends gas into the first air channel 104, and extracts gas from the second air channel 203, driving the piston 106 to move down along the air cavity 202 under the action of air pressure, driving the push rod 107 to move downward at the same time, and the push rod 107 pushes the wedge-shaped clamp block 206 to produce a downward movement trend. The wedge-shaped clamp body 205 converts the direction of force into the horizontal direction, so the two wedge-shaped clamp blocks 206 move inward at the same time, and the test object in the middle of the clamp blocks is pressed. The test material is clamped, and the clamp block baffle 207 ensures that the wedge clamp block 206 does not move forward and backward. The external power source pulls the joint 101 to drive the overall movement, and the test material is stretched to complete the experiment. The design of driving the piston 106 to move by blowing air with an air pump solves the problem that conventional large-tonnage hydraulic tensile clamps need to be used with a high-pressure oil station, reduces the noise during use, reduces the heat generation, and reduces the maintenance cost. Through the wedge-shaped self-locking clamping material, only a small pre-pressure is required to clamp the sample with a tensile force of not less than 30 tons, so that the device can be used for tensile tests of metal and reinforced composite materials, and the device has stronger clamping stability.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large-tonnage pneumatic tensile test fixture, characterized in that: It comprises a connecting device (1), wherein a clamping device (2) is provided at the bottom of the connecting device (1); The connecting device (1) comprises a joint (101), a gap nut (102) is arranged at the bottom of the joint (101), a top cover (103) is fixedly arranged below the joint (101), a first air channel (104) is arranged on one side of the top cover (103), a first connecting groove (105) is arranged on the outer side of the first air channel (104), a piston (106) is arranged at the bottom of the top cover (103), and a push rod (107) is fixedly arranged at the bottom of the piston (106); The clamping device (2) comprises a base (201), an air cavity (202) is arranged on the top of the base (201), a second air channel (203) is arranged on one side of the base (201), a second connecting groove (204) is arranged on the outer side of the second air channel (203), a wedge-shaped clamp body (205) is fixedly arranged on the bottom of the base (201), two wedge-shaped clamp blocks (206) are symmetrically slidably arranged on the inner side of the wedge-shaped clamp body (205), two clamp block baffles (207) are symmetrically arranged on the front and rear sides of the wedge-shaped clamp block (206), and two handles (208) are symmetrically arranged on the outer side of the base (201).

2. A large-tonnage pneumatic tensile test fixture according to claim 1, characterized in that: The joint (101) and the top cover (103) are integrally formed.

3. A large-tonnage pneumatic tensile test fixture according to claim 1, characterized in that: The first air channel (104) and the second air channel (203) are both L-shaped.

4. A large-tonnage pneumatic tensile test fixture according to claim 1, characterized in that: The piston (106) is slidably connected to the base (201).

5. The large-tonnage pneumatic tensile test fixture according to claim 1, characterized in that: The wedge-shaped clamp body (205) and the base (201) are integrally formed, and the top cover (103) and the base (201) are bolted together.

6. A large-tonnage pneumatic tensile test fixture according to claim 1, characterized in that: The clamp block baffle (207) is L-shaped, and the clamp block baffle (207) is bolted to the wedge-shaped clamp body (205).

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