CN216621944U

CN216621944U - Tensile test fixture

Info

Publication number: CN216621944U
Application number: CN202122928471.7U
Authority: CN
Inventors: 张栋翔; 刘曙光; 闫长旺; 邓轶涵; 尹立强
Original assignee: Inner Mongolia University of Technology; Inner Mongolia Electric Power Research Institute of Inner Mongolia Power Group Co Ltd
Current assignee: Inner Mongolia University of Technology; Inner Mongolia Electric Power Research Institute of Inner Mongolia Power Group Co Ltd
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2022-05-27
Anticipated expiration: 2031-11-26

Abstract

The utility model discloses a tensile test fixture, which is used for clamping two ends of a test piece and comprises two groups of traction assemblies, wherein force transmission frames are arranged on the two groups of traction assemblies, the two groups of traction assemblies respectively clamp two ends of the test piece through the corresponding force transmission frames, jacking pieces are arranged on two sides of the two groups of force transmission frames, and one side of the jacking pieces, which is attached to the test piece, is provided with a butting surface with variable curvature. This tensile test anchor clamps are provided with the roof pressure piece at the structural of biography power frame, are provided with the changeable butt face of camber on the roof pressure piece simultaneously, can adapt to the variable cross section surface of test piece according to the camber that changes the butt face like this, can increase the laminating area of roof pressure piece and test piece surface like this, avoid test piece atress uneven when tensile, can effectively protect the test piece. In addition, the end of the test piece can be effectively clamped by the force transmission frame, so that the test piece is prevented from generating lateral deviation in the test process and influencing the stress.

Description

Tensile test fixture

Technical Field

The utility model relates to the technical field of power equipment tests, in particular to a tensile test clamp.

Background

At present, different cement-based composite materials are often adopted for building electric power facilities in different environments in electric power construction, and the cement-based composite materials are generally obtained by blending tests in laboratories before actual application. At present, after the new cement-based composite materials are prepared and tested in laboratories, tensile and compression resistance, shearing resistance, corrosion resistance and other tests are generally required to be carried out on structures formed by the cement-based composite materials so as to accurately judge the performances of the cement-based composite materials.

The tensile test of the structure formed by the cement-based composite materials is the key point of the whole cement-based composite material test, a cement-based composite material product is generally manufactured into a standard test piece with two large ends and a small middle, namely a dumbbell-shaped test piece, then the two ends of the test piece are respectively clamped by special clamps, and then the clamps at the two ends are respectively fixed on tensile test equipment. The connecting part between the middle part and the two ends of the standard test piece adopts smooth cambered surface transition, and the connecting part is a variable cross section part, so that the problem that the normal test work is influenced due to the fact that the test piece is broken at the variable cross section part due to stress concentration during a tensile test can be avoided. The main effect of variable cross section department is the anchor clamps centre gripping test piece of being convenient for, and the anchor clamps generally adopt the form of face contact to carry out the face contact with the surface of test piece variable cross section department when the centre gripping test piece, can guarantee like this that the test piece can not take place to separate with anchor clamps and drop in tensile process.

In addition, when the clamp makes surface contact with the outer surface of the variable cross section of the test piece, in order to ensure the stability and the qualitative of the stretching, the curvature of the variable cross section of the test piece and the abutting structure abutting against the clamp are kept at the same curvature, so that the tight connection between the test piece and the clamp can be ensured, and the uniform stress is ensured when the test piece is stretched and stressed. However, in such a connection mode, the curvature of the variable cross section of the test piece must be required to be the same as the curvature of the abutting surface of the abutting structure on the fixture, and it is difficult to ensure that the processing specifications of the test piece are the same every time in the actual processing process, and meanwhile, the abutting structure on the fixture is also worn in actual use, so that the abutting structure on the fixture is difficult to completely fit with the outer surface of the variable cross section of the test piece, and further, uneven stress is likely to occur in the tensile test process, and the test effect is affected.

Disclosure of Invention

The utility model aims to solve at least one of the technical problems and provides a tensile test clamp which can adapt to surfaces with different curvatures and effectively ensure close contact with a test piece.

In order to achieve the purpose, the utility model adopts the technical scheme that:

the utility model provides a tensile test anchor clamps for the both ends of centre gripping test piece, includes two sets of tractive subassemblies, and is two sets of all be provided with the biography power frame on the tractive subassembly, it is two sets of the tractive subassembly centre gripping respectively through the biography power frame that corresponds the both ends of test piece are two sets of all be provided with the roof pressure piece on the both sides of biography power frame, the roof pressure piece with one side of test piece laminating is provided with the changeable butt face of camber.

Furthermore, one end of the jacking member is hinged to a force transmission frame through a rotating shaft, an arc-shaped guide groove is formed in the force transmission frame, and the other end of the jacking member is slidably mounted in the arc-shaped guide groove through a locking shaft member so as to change the curvature of the abutting surface; the locking shaft piece can be locked relative to the arc-shaped guide groove.

Furthermore, the jacking piece comprises a head connecting block and a sub connecting block, at least two sub connecting blocks are arranged, all the sub connecting blocks are hinged to form a deformation body, the two sub connecting blocks on the two ends of the deformation body are hinged to the head connecting block, one head connecting block is installed on the force transmission frame through a rotating shaft, and the other head connecting block is installed in the arc-shaped guide groove in a sliding mode through the locking shaft piece.

Furthermore, at least one connecting structure is arranged on the head connecting block and the sub connecting blocks, and the head connecting block is connected with the sub connecting blocks and connected with the adjacent two sub connecting blocks through the connecting structures.

Furthermore, the connecting structure comprises a connecting groove and a connecting head, the connecting groove is arranged on one side of the head connecting block and the sub connecting block, and the connecting head is arranged on the other side of the head connecting block and the sub connecting block; the two adjacent sub-connecting blocks, the adjacent head connecting block and the sub-connecting block are respectively connected in a mode of hinging the connecting head with the connecting groove.

Further, the head connecting block and the sub connecting block are both sector ring bodies.

Furthermore, a detachable protective pad is arranged on the abutting surface.

Furthermore, the traction assembly comprises a traction seat and a pull rod, a traction clamping groove is formed in the traction seat, one end of the pull rod is clamped in the traction clamping groove through a spherical hinge, and the other end of the pull rod is connected with the force transmission frame.

Furthermore, a connecting hole is formed in the traction seat.

The utility model has the beneficial effects that:

the top pressing piece is arranged on the structure of the force transmission frame, and meanwhile, the top pressing piece is provided with the abutting surface with variable curvature, so that the curvature of the abutting surface can be changed to adapt to the outer surface of the variable cross section of the test piece, the attaching area of the top pressing piece and the outer surface of the test piece can be increased, the uneven stress of the test piece during stretching is avoided, and the test piece can be effectively protected. In addition, the end of the test piece can be effectively clamped by the force transmission frame, so that the test piece is prevented from generating lateral deviation in the test process and influencing the stress.

Drawings

The following detailed description of embodiments of the utility model is provided in conjunction with the appended drawings, in which:

FIG. 1 is a state diagram illustrating the use of an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an embodiment of the present invention;

FIG. 3 is a partial cross-sectional view of an embodiment of the present invention;

FIG. 4 is a partial cross-sectional view of another embodiment of the present invention;

fig. 5 is a schematic structural view of the top pressing member in the embodiment of the utility model.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or there can be intervening components, and when a component is referred to as being "disposed in the middle," it is not just disposed in the middle, so long as it is not disposed at both ends, but rather is within the scope of the middle. The terms "vertical," "horizontal," "left," "right," and the like are used herein for purposes of illustration only.

Referring to fig. 1 to 5, the application provides a tensile test fixture for clamping two ends of a test piece 100, which includes two sets of traction assemblies 200, wherein the two sets of traction assemblies 200 are respectively provided with a force transmission frame 210, the two sets of traction assemblies 200 respectively clamp two ends of the test piece 100 through the corresponding force transmission frames 210, two sets of pressure transmission frames 210 are respectively provided with a top pressure member 300 on two sides, and one side of the top pressure member 300 attached to the test piece 100 is provided with a butt joint surface 310 with variable curvature. Wherein, the two pulling components 200 are respectively connected with two pulling ends of the tensile test equipment; in addition, the force transmission rack 210 is provided therein with an accommodating space for accommodating the ends of the test piece 100 at both ends thereof, and the top pressing member 300 is disposed on both sides of the accommodating space, wherein the two sides are the side surfaces corresponding to the outer surface having the curvature slope when the test piece 100 is inserted into the accommodating space. In fact, the accommodating space is designed as an open slot, and the two side surfaces for installing the pressing member 300 are designed as through holes, so that the pressing member 300 can be installed conveniently and the pressing member 300 has enough space to deform and change the curvature of the abutting surface 310.

The top pressing piece 300 is arranged on the structure of the force transmission frame 210, and meanwhile, the top pressing piece 300 is provided with the abutting surface 310 with variable curvature, so that the curvature of the abutting surface 310 can be changed to adapt to the outer surface of the variable cross section of the test piece 100, the attaching area of the top pressing piece 300 and the outer surface of the test piece 100 can be increased, the uneven stress of the test piece 100 during stretching is avoided, and the test piece 100 can be effectively protected. In addition, the force transmission frame 210 can effectively clamp the end of the test piece 100, and the test piece 100 is prevented from deviating laterally in the test process to influence the stress.

In order to better connect, avoid eccentricity between the force transmission frame 210 and the stretching device, and ensure that the acting force direction when the force transmission frame 210 stretches the test piece 100 is the same as the applying direction of the stretching device, the drawing assembly 200 comprises a drawing seat 250 and a pull rod 220, a drawing clamping groove 260 is arranged on the drawing seat 250, one end of the pull rod 220 is clamped in the drawing clamping groove 260 through a spherical hinge 230, and the other end of the pull rod 220 is connected with the force transmission frame 210. Wherein, ball pivot 230 card can increase the flexibility of installation like this in drawing draw-in groove 260, can guarantee that the tensile force that transmits on the tensile end of dowel steel 210, pull rod 220, traction seat 250 and tensile equipment all collineates, avoids taking place the atress lateral deviation among the tensile process and leads to whole anchor clamps to take place the atress fracture. The whole traction clamping groove 260 is a T-shaped groove structure penetrating through the whole pull rod 220, and meanwhile, a concave area is arranged in the middle of the traction clamping groove 260, so that the spherical surface of the spherical hinge 230 can be conveniently accommodated. In addition, in order to better facilitate the connection of the traction base 250 with an external stretching device, the traction base 250 is provided with a connection hole 240, and the connection hole 240 is connected with a stretching end of the external stretching device.

With further reference to fig. 1 to 5, in order to better realize that the press 300 has an abutment surface 310 capable of changing curvature, the press 300 in this application can be realized by a conventional deformable strip material, and the change of the abutment surface 310 can also be realized by a conventional chain structure or a bendable support plate structure. However, in order to solve the above-mentioned problem of how to mount the pressing member 300 on the force transmission frame 210, the present application provides a specific embodiment for facilitating the operation. One end of the jacking member 300 is hinged to the force transmission frame 210 through a rotating shaft 320, an arc-shaped guide groove 270 is formed in the force transmission frame 210, and the other end of the jacking member 300 is slidably mounted in the arc-shaped guide groove 270 through a locking shaft member 340 so as to change the curvature of the abutting surface 310; the locking shaft member 340 can be locked with respect to the arc-shaped guide groove 270. One end of the top pressing piece 300 can swing around the force transmission frame 210, and the other end can be matched with the locking shaft piece 340 through the arc-shaped guide groove 270, so that the end with the locking shaft piece 340 can be forced to move in the arc-shaped guide groove 270, and the deformation of the top pressing piece 300 is forced; the locking shaft 340 can be locked relative to the arc-shaped guide groove 270, so that two ends of the top pressing member 300 can be fixed, and the abutting surface 310 on the fixed top pressing member 300 can keep the already-shaped curvature in the tensile test process.

Referring further to fig. 3 to 5, in order to better enable the abutting member 300 to both support the outer surface of the test piece 100 and have sufficient strength to transmit tensile force. The top pressing piece 300 comprises a head connecting piece 350 and sub connecting pieces 360, at least two sub connecting pieces 360 are arranged, all the sub connecting pieces 360 are hinged to form a deformation body, the two sub connecting pieces 360 on two ends of the deformation body are hinged to the head connecting piece 350, the head connecting piece 350 is installed on the force transmission frame 210 through a rotating shaft 320, and the other head connecting piece 350 is installed in the arc-shaped guide groove 270 through a locking shaft piece 340 in a sliding mode. In this embodiment, the head connecting block 350 mounted with one end of the rotating shaft 320 can only be installed on the force transmission frame 210 in a swinging manner, so that the head connecting block 350 can automatically adjust the swinging angle thereof according to the deformation condition of the deformation body, and the adaptability is improved; in addition, the end for installing the locking shaft member 340 is an end for adjusting the deformation curvature of the deformable body, and the end is integrally of a sliding design, so that the adjustment is convenient, and meanwhile, the locking function is also provided, so that the deformation curvature of the deformable body can be maintained. For better locking, a plurality of clamping positions 280 can be arranged on the side wall of the arc-shaped guide groove 270, the locking shaft 340 can be clamped in the clamping positions 280, and the locking shaft 340 can also be locked by the nut 330, so that the locking shaft 340 can be completely locked in the arc-shaped guide groove 270 or the clamping positions 280, and thus the head connecting block 350 connected with the locking shaft 340 can be ensured to realize position locking, and further the position of the other end of the deformation body is ensured to be fixed. The above-mentioned deformation body can change the curvature of the abutting surface 310 on the deformation body by changing the relative position of the two head connecting blocks 350. In the present application, all of the head links 350 and the sub-links 360 are formed in a bar shape, which facilitates changing the deformation state of the entire structure. In this embodiment, the sub-block 360 may also be a single block, and two sides of the sub-block 360 are respectively hinged to the two head blocks 350 to form a deformation body composed of three parts, so that the curvature of the side surface of the corresponding side of the deformation body can be changed.

Further, in order to realize the movable connection between the adjacent structures, in an embodiment of the present application, at least one connection structure 370 is disposed on each of the head connecting block 350 and the sub connecting block 360, and the head connecting block 350 is connected to the sub connecting block 360 and the two adjacent sub connecting blocks 360 through the connection structure 370. Wherein the connecting structure 370 may be a conventional hinge or a hinge, or may even have a flexible deformable band structure for connecting two adjacent structures.

As a modification of the above embodiment, referring to fig. 5, in an embodiment of the present application, the connection structure 370 includes a connection groove 371 and a connection head 372, the connection groove 371 is disposed on one side of the head link block 350 and the sub-link block 360, and the connection head 372 is disposed on the other side of the head link block 350 and the sub-link block 360; the two adjacent sub-connecting blocks 360, the adjacent head connecting block 350 and the sub-connecting block 360 are respectively connected in a mode of hinging the connecting head 372 and the connecting groove 371. The connecting groove 371 may be formed by a gap between two connecting lugs, or may be directly formed by cutting grooves in the head connecting block 350 and the sub connecting block 360. Wherein, the limit angle that connecting groove 371 and connector 372 can swing each other can be designed according to the actual work demand, and then can design the degree of depth of connecting groove 371 and the length of connector 372. In addition, it should be noted that in the present embodiment, all the connecting structures 370 are disposed on the same side of the deformation structure formed by the whole head piece 350 and the sub-piece 360, and the abutting surfaces 310 are disposed on the opposite sides of the connecting structures 370 on the whole deformation structure, so that the abutting surfaces 310 are discontinuous, which facilitates to adjust the curvature of the abutting surfaces 310 formed on the corresponding sides of the whole head piece 350 and the sub-piece 360.

Further, in order to better change the curvature of the pressing member 300 formed by all the head-connecting blocks 350 and the sub-connecting blocks 360, in a modified embodiment, the head-connecting blocks 350 and the sub-connecting blocks 360 are fan-shaped ring bodies. Meanwhile, the connection structures 370 are formed on the side of the head link block 350 and the sub-link block 360 near the inner ring or on both ends of the side near the inner ring, so that the pressing member 300 can be bent into a ring.

In a modified embodiment, in order to avoid the test piece 100 from wearing the head connecting block 350 and the sub connecting block 360 in the drawing process, a detachable protective pad is arranged on the abutting surface 310 on the head connecting block 350 and the sub connecting block 360, the protective pad can further buffer the tensile impact, and meanwhile, the abutting surface 310 can be better abutted against the outer surface of the variable cross section of the test piece 100, the contact area is increased, and the stress uniformity is improved.

The above embodiments are only for illustrating the technical solutions of the present invention and are not limited thereto, and any modification or equivalent replacement without departing from the spirit and scope of the present invention should be covered within the technical solutions of the present invention.

Claims

1. The tensile test fixture is used for clamping two ends of a test piece and is characterized by comprising two groups of traction assemblies, wherein force transmission frames are arranged on the traction assemblies, the traction assemblies are respectively clamped at two ends of the test piece through the corresponding force transmission frames, jacking pieces are arranged on two sides of the force transmission frames, and a butting surface with variable curvature is arranged on one side, which is attached to the test piece, of each jacking piece.

2. The tensile test fixture of claim 1, wherein one end of the jacking member is hinged to a force transmission frame through a rotating shaft, the force transmission frame is provided with an arc-shaped guide groove, and the other end of the jacking member is slidably mounted in the arc-shaped guide groove through a locking shaft member so as to change the curvature of the abutting surface; the locking shaft piece can be locked relative to the arc-shaped guide groove.

3. The tensile test fixture of claim 2, wherein said pressing member comprises at least two head connecting blocks and two sub connecting blocks, all of said sub connecting blocks are hinged to form a deformable body, two of said sub connecting blocks at two ends of said deformable body are hinged to said head connecting blocks, one of said head connecting blocks is mounted on the force transmission frame through a rotating shaft, and the other of said head connecting blocks is slidably mounted in the arc-shaped guide groove through a locking shaft member.

4. The tensile test fixture of claim 3, wherein at least one connecting structure is disposed on each of the head connecting block and the sub connecting block, and two adjacent sub connecting blocks are connected through the connecting structures.

5. The tensile test fixture of claim 4, wherein said connecting structure comprises connecting slots disposed on one side of the head link block and the sub-link block, and a connecting head disposed on the other side of the head link block and the sub-link block; the two adjacent sub-connecting blocks, the adjacent head connecting block and the sub-connecting block are respectively connected in a mode of hinging the connecting head with the connecting groove.

6. A tensile test fixture according to claim 4, wherein said head link block and said sub-link block are each fan-shaped ring bodies.

7. A tensile test fixture according to any one of claims 1 to 6, wherein said abutment surfaces are provided with removable protective pads.

8. The tensile test fixture of any one of claims 1-6, wherein the pulling assembly comprises a pulling seat and a pulling rod, the pulling seat is provided with a pulling slot, one end of the pulling rod is clamped in the pulling slot by a spherical hinge, and the other end of the pulling rod is connected with the force-transmitting frame.

9. The tensile test fixture of claim 8, wherein said traction base is provided with attachment holes.