Tensile test fixture for universal testing machine

Abstract

The utility model discloses a tensile test fixture for a universal testing machine, which comprises two fixture unit groups, each fixture unit group comprises a mounting unit and a clamping unit, each mounting unit comprises a mounting main body, a positioning nut and a connecting plug, each mounting main body comprises a double-hook suspension structure and a connecting rod structure, and each connecting rod structure is connected with the corresponding mounting main body. The connecting rod structure is provided with a positioning thread and an inserting hole, the positioning nut is installed on the positioning thread in a matched mode, and the connecting inserting bolt is matched with the inserting hole. The clamping unit comprises a clamping plug, reinforcing gaskets and a locking nut, the multiple reinforcing gaskets are arranged on the clamping plug in a matched and sleeving mode and clamped through a fixing nut structure and the locking nut, and the two ends of the clamping plug are hung on the double-hook hanging structure in a matched mode. The tensile test clamp for the universal testing machine is reasonable in structure and convenient to mount, can stably clamp a test sample piece, and prevents the clamped part of the test sample piece from being damaged under the action of high load.

Description

Technical Field

[0001] The utility model relates to a tensile test fixture for a universal testing machine, which is suitable for stably clamping a thin plate-shaped test piece. Background Art

[0002] The tensile strength and shear strength of materials and structures are their main physical performance indicators, and the most common testing equipment is the universal testing machine. The fixture of the universal testing machine is an important structure of the universal testing machine. Its main function is to connect the test component with the universal testing machine, stably clamp the test component during the performance test, and ensure the smooth progress of the test.

[0003] The fixtures of universal test pieces can be divided into tensile fixtures, compression fixtures, bending fixtures, peeling fixtures, etc. according to the test method. Among them, the main structural forms of tensile fixtures can be divided into plug-in fixtures, clamping fixtures, wedge-shaped fixtures, etc. Among them, the plug-in fixture has a simple structure, but the clamping part is easily damaged, which leads to test failure; the clamping fixture structure is easy to operate, but it mainly relies on friction to clamp. During the test, as the load increases, the clamping force becomes smaller and smaller. When it exceeds the limit, it will cause the test sample to fall out and the test to fail; the wedge-shaped fixture is easy to operate, and the clamping force increases with the increase of load, but it is large in size and complex in structure. In addition, it has high requirements for specimens when testing shear and handling asymmetric structures, and the pre-test processing is cumbersome.

[0004] Therefore, it is an urgent problem to provide a fixture that has a simple structure, convenient operation, stable clamping, and is suitable for testing the tensile strength and shear strength of thin plate-shaped specimens under high load conditions. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a tensile test fixture for a universal testing machine to solve the problems existing in traditional tensile fixtures.

[0006] The utility model provides a tensile test fixture for a universal testing machine, comprising: two fixture unit groups, wherein the fixture unit group comprises a mounting unit and a clamping unit, the mounting unit comprises a mounting body, a positioning nut and a connecting plug, the mounting body comprises a double-hook suspension structure and a connecting rod structure fixedly connected to the end of the double-hook suspension structure, the connecting rod structure is provided with a positioning thread and a socket, the positioning nut is mounted on the positioning thread, the connecting plug is matched with the socket, and is used to connect the mounting body and the fixture mounting seat of the universal testing machine, the clamping unit comprises a clamping plug, a reinforcing gasket and a locking nut , wherein the clamping plug includes a plug spindle structure, a locking nut structure, a locking thread structure and a mounting end structure, the plug spindle structure is arranged in the middle part of the clamping plug and the outer diameter is matched with the reinforcing gasket and the test sample, the locking nut structure and the locking thread structure are respectively arranged on both sides of the plug spindle structure, the mounting end structure is arranged on both sides of the locking nut structure and the locking thread structure, and is used to be matched and hung on the double-hook suspension structure, the reinforcing gasket is multiple pieces and is matched and sleeved on the plug spindle structure, and the locking nut is matched and installed on the locking thread structure to fix the reinforcing gasket.

[0007] Preferably, the double-hook suspension structure includes a first suspension plate, a second suspension plate and a connecting plate. The first suspension plate and the second suspension plate have the same structure and are vertically connected to both sides of the connecting plate. The first suspension plate and the second suspension plate are correspondingly provided with limiting grooves that cooperate with the mounting end structure.

[0008] Further preferably, the positioning nut is provided with a plurality of radial holes spaced apart along the circumferential direction.

[0009] Further preferably, the diameter of the plug spindle structure is larger than the diameter of the mounting end structure.

[0010] Further preferably, the mounting end structure is a bare rod structure.

[0011] The tensile test fixture for a universal testing machine provided by the utility model has a reasonable structure, is easy to install, can stably clamp the test sample, and prevents the clamping part of the test sample from being damaged under high load. It is particularly suitable for physical property testing of tensile strength and shear strength of thin plate-shaped specimens under high load conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is further described in detail below with reference to the accompanying drawings and implementation modes:

[0013] Figure 1 A three-dimensional diagram of a tensile test fixture for a universal testing machine provided by the utility model;

[0014] Figure 2It is a stereogram of the mounting unit;

[0015] Figure 3 A three-dimensional diagram of the mount body;

[0016] Figure 4 is a three-dimensional diagram of the clamping unit;

[0017] Figure 5 It is a schematic diagram of the structure of the clamping plug. DETAILED DESCRIPTION

[0018] The present invention will be further explained below in conjunction with specific implementation schemes, but the present invention is not limited thereto.

[0019] like Figures 1 to 5 As shown, the utility model provides a tensile test fixture for a universal testing machine, comprising: two fixture unit groups 1 with the same configuration, respectively used to clamp the two clamping ends of the test sample 2, wherein the fixture unit group 1 comprises a mounting unit 11 and a clamping unit 12, the mounting unit 11 comprises a mounting body 111, a positioning nut 112 and a connecting plug 113, the mounting body 111 comprises a double-hook suspension structure 1111 and a connecting rod structure 1112 fixedly connected to the end of the double-hook suspension structure 1111, the connecting rod structure 1112 is provided with a positioning thread 11121 and a socket 11122, the positioning nut 112 is mounted on the positioning thread 11121, the connecting plug 113 cooperates with the socket 11122, and is used to connect the mounting body 111 and the fixture mounting seat 3 of the universal testing machine, the clamping unit 12 comprises a clamping plug 121, a positioning nut 112 and a connecting plug 113, The clamping plug 121 includes a plug spindle structure 1211, a locking nut structure 1212, a locking thread structure 1213 and a mounting end structure 1214. The plug spindle structure 1211 is arranged in the middle of the clamping plug 121 and its outer diameter matches the reinforcing gasket 122 and the test sample 2. The locking nut structure 1212 and the locking thread structure 1213 are respectively arranged at the middle of the clamping plug 121. On both sides of the plug main shaft structure 1211, the mounting end structure 1214 is arranged on both sides of the locking nut structure 1212 and the locking thread structure 1213, and is used to be hung on the double-hook suspension structure 1111. The reinforcing gasket 122 is multi-piece and is cooperatively sleeved on the plug main shaft structure 1211. The locking nut 123 is cooperatively installed on the locking thread structure 1213, and is used to fix the reinforcing gasket 122.

[0020] The tensile test fixture for the universal testing machine is particularly suitable for testing the physical properties of thin plate-shaped specimens such as tensile strength and shear strength under high load conditions. During testing, the clamping units in the two clamp unit groups of the tensile test fixture correspond to the two clamping ends of the clamped test specimen, wherein both ends of the test specimen are provided with through holes that cooperate with the plug spindle structure of the clamping plug, and the test specimen is sleeved on the plug spindle structure and is located between the reinforcing gaskets and is locked by a locking nut. The locking nut can lock the clamping part of the reinforcing gasket and the test specimen to prevent the reinforcing gasket from loosening and failing. The plug spindle structure can provide strength support for the clamping part of the test specimen when the test specimen is under load by cooperating with the through hole of the clamping part of the test specimen. The reinforcing gasket can reinforce the clamping part of the test sample to prevent the clamping part from being damaged under high load; the two clamping units are mounted on the double-hook suspension structure of the two mounting units through the mounting end structure, and the two connecting rod structures are respectively connected to the clamp mounting seat of the universal testing machine through two connecting plugs that simultaneously pass through the clamp mounting seat of the universal testing machine and the sockets on the connecting rod structure; wherein, the locking positioning nut can fix the mounting body and the clamp mounting seat of the universal testing machine, thereby fixing the position and direction of the mounting body, and preventing the test sample from twisting around the force direction during the test.

[0021] As an improvement of the technical solution, Figures 1 to 3 As shown, the double-hook suspension structure 1111 includes a first suspension plate 11111, a second suspension plate 11112 and a connecting plate 11113. The first suspension plate 11111 and the second suspension plate 11112 have the same structure and are vertically connected to the two sides of the connecting plate 11113. The first suspension plate 11111 and the second suspension plate 11112 are correspondingly provided with limiting grooves that cooperate with the mounting end structure 1214 to ensure the stability of the clamping bolt suspension.

[0022] As an improvement of the technical solution, Figure 1 , Figure 2 As shown, the positioning nut 112 is provided with a plurality of radial holes 1121 at intervals along the circumferential direction for applying leverage when tightening. Preferably, the radial holes are evenly distributed.

[0023] As an improvement of the technical solution, Figure 5 As shown: the diameter of the plug spindle structure 1211 is greater than the diameter of the mounting end structure 1214 .

[0024] As an improvement of the technical solution, Figures 1 to 3 As shown, the mounting end structure 1214 is a bare rod structure, which can prevent the locking nut from being unable to be assembled or disassembled due to thread deformation of the screw when the screw is subjected to force.

[0025] The material of the tensile test fixture for the universal testing machine includes but is not limited to one or more of alloy steel, stainless steel, carbon steel, aluminum alloy, engineering plastics, and composite materials.

[0026] The specific implementation methods of the present utility model are written in a progressive manner, emphasizing the differences between the various implementation methods, and the similar parts thereof can be referenced to each other.

[0027] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A tensile test fixture for a universal testing machine, characterized in that: include: Two clamp unit groups (1), wherein the clamp unit group (1) comprises a mounting unit (11) and a clamping unit (12), the mounting unit (11) comprises a mounting body (111), a positioning nut (112) and a connecting plug (113), the mounting body (111) comprises a double-hook suspension structure (1111) and a connecting rod structure (1112) fixedly connected to the end of the double-hook suspension structure (1111), and the connecting rod structure (1112) is A positioning thread (11121) and a socket (11122) are provided, the positioning nut (112) is mounted on the positioning thread (11121), the connecting plug (113) is matched with the socket (11122) and is used to connect the mounting body (111) and the fixture mounting seat (3) of the universal testing machine, the clamping unit (12) comprises a clamping plug (121), a reinforcing gasket (122) and a locking nut (123), wherein the clamping The plug (121) comprises a plug main shaft structure (1211), a locking nut structure (1212), a locking thread structure (1213) and a mounting end structure (1214); the plug main shaft structure (1211) is arranged in the middle of the clamping plug (121) and has an outer diameter that matches the reinforcing gasket (122) and the test sample (2); the locking nut structure (1212) and the locking thread structure (1213) are respectively arranged on the plug main shaft structure (1211). 11), the mounting end structure (1214) is arranged on both sides of the locking nut structure (1212) and the locking thread structure (1213), and is used to be hung on the double-hook suspension structure (1111); the reinforcing gasket (122) is a plurality of pieces and is sleeved on the plug spindle structure (1211); the locking nut (123) is installed on the locking thread structure (1213), and is used to fix the reinforcing gasket (122).

2. The tensile test fixture for a universal testing machine according to claim 1, characterized in that: The double-hook suspension structure (1111) comprises a first suspension plate (11111), a second suspension plate (11112) and a connecting plate (11113); the first suspension plate (11111) and the second suspension plate (11112) have the same structure and are vertically connected to two sides of the connecting plate (11113); the first suspension plate (11111) and the second suspension plate (11112) are correspondingly provided with limiting grooves that cooperate with the mounting end structure (1214).

3. The tensile test fixture for a universal testing machine according to claim 1, characterized in that: The positioning nut (112) is provided with a plurality of radial holes (1121) at intervals along the circumferential direction.

4. The tensile test fixture for a universal testing machine according to claim 1, characterized in that: The diameter of the plug spindle structure (1211) is greater than the diameter of the mounting end structure (1214).

5. The tensile test fixture for a universal testing machine according to claim 1, characterized in that: The mounting end structure (1214) is a bare rod structure.

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