CN216284627U

CN216284627U - Tension test fixture

Info

Publication number: CN216284627U
Application number: CN202122060576.5U
Authority: CN
Inventors: 梁虎; 薛中春; 邓松; 邵正文; 李常青; 余立国
Original assignee: Hongzhun Precision Tooling Kunshan Co Ltd
Current assignee: Hongzhun Precision Tooling Kunshan Co Ltd
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2022-04-12
Anticipated expiration: 2031-08-30

Abstract

A tensile test fixture is used for clamping a test piece. Comprises a bearing mechanism, two clamping jaws, a pull rod and an adjusting piece. The bearing mechanism is provided with a sliding hole penetrating along a first direction. Each clamping jaw is rotatably connected to the bearing mechanism, and the two clamping jaws are arranged at intervals. The opposite sides of the two clamping jaws are respectively provided with a first inclined surface, and the distance between the two first inclined surfaces is gradually reduced along the first direction. The pull rod comprises a supporting section, a sliding section and a connecting section which are sequentially arranged along a first direction. The sliding section is arranged in the sliding hole in a penetrating way. The abutting section is located between the two clamping jaws, and two ends of the abutting section are respectively used for abutting against the two first inclined planes. The connecting section extends at least partially from the carrying means. The adjusting piece is connected to the connecting section and abuts against the bearing mechanism, and the adjusting piece is used for adjusting the length of the connecting section extending out of the bearing mechanism so as to drive the abutting section to slide on the first inclined plane and enable the two clamping jaws to clamp the test piece. The tensile test fixture can reduce the risk of damage to the test piece in the locking process.

Description

Tension test fixture

Technical Field

The application relates to the technical field of tension testing, in particular to a tension testing clamp.

Background

In order to take the aesthetic and signal transceiving problems into consideration, the electronic devices are increasingly designed by using an aluminum-plastic bonding process, and cracking of the aluminum-plastic bonding part is a major challenge in the process. In order to prevent the above-mentioned undesirable phenomena, the aluminum-plastic combined tension test is an important ring for inspecting the reliability of the housing. The clamp is one of important accessories of a tension test and is used for clamping a test piece on a shell, and the reasonability of the structure of the clamp has direct influence on detection data. The existing clamp needs to apply larger locking force to prevent the clamped test piece from slipping, but the test piece is easily damaged in the locking process, for example, the test piece is broken off or even falls off.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need for a tensile test fixture that reduces the risk of damage to the test piece during the locking process.

The embodiment of the application provides a tensile test anchor clamps for centre gripping test piece. The tension test fixture comprises a bearing mechanism, two clamping jaws, a pull rod and an adjusting piece. The bearing mechanism is provided with a sliding hole penetrating along a first direction. Each jaw is rotatably connected to the carrier mechanism to allow the jaws to open and close relative to each other, the jaws being spaced apart. The opposite sides of the two clamping jaws are respectively provided with a first inclined surface, and the distance between the two first inclined surfaces is gradually reduced along the first direction. The pull rod comprises a supporting section, a sliding section and a connecting section which are sequentially arranged along a first direction. The sliding section is arranged in the sliding hole in a penetrating way. The abutting section is located between the two clamping jaws, and two ends of the abutting section are respectively used for abutting against the two first inclined planes. The connecting section extends at least partially from the carrying means. The adjusting piece is connected to the connecting section and abuts against the bearing mechanism, and the adjusting piece is used for adjusting the length of the connecting section extending out of the bearing mechanism so as to drive the abutting section to slide on the first inclined plane and enable the two clamping jaws to clamp the test piece.

Further, in some embodiments of the present application, the supporting mechanism includes a supporting member, and a limiting member, which are sequentially disposed along a first direction, the supporting member is concavely disposed with a receiving groove, the two clamping jaws are rotatably connected to a groove wall of the receiving groove, the sliding hole is disposed in the supporting member and is communicated with the receiving groove, and the adjusting member is movably disposed between the supporting member and the limiting member along the first direction.

Further, in some embodiments of the present application, the limiting member includes at least two limiting portions disposed at an interval, each of the limiting portions includes a first portion and a second portion, one end of the first portion is connected to the bearing member and extends along the first direction, the second portion is connected to an end of the first portion away from the bearing member and extends toward the axial direction of the pull rod, and a gap with a preset distance is disposed between the second portion and the adjusting member.

Further, in some embodiments of the present application, two ends of the abutting section are respectively provided with a convex portion extending in a direction perpendicular to the first direction, and each convex portion abuts against a first inclined surface.

Further, in some embodiments of the present application, a surface of each convex portion contacting the first slope is an arc-shaped surface.

Further, in some embodiments of the present application, one side of each of the two clamping jaws opposite to each other is further provided with a clamping surface and a second inclined surface, the clamping surface, the second inclined surface and the first inclined surface on the same clamping jaw are sequentially arranged along the first direction, the distance between the two second inclined surfaces is gradually increased, and the two clamping surfaces are used for clamping the test piece.

Further, in some embodiments of the present application, each of the clamping jaws is provided with a pin hole, the pin hole is provided at a folding point of the clamping jaw at the first inclined plane and the second inclined plane, the bearing mechanism is provided with a pivot pin, and the pin hole of each of the clamping jaws passes through the pivot pin on the bearing mechanism.

Further, in some embodiments of the present application, the adjustment member is threadedly coupled to the connecting section.

Further, in some embodiments of the present application, a cross-section of the sliding hole and the sliding section perpendicular to the first direction is rectangular.

Further, in some embodiments of the present application, the tensile test fixture further includes a pull ring fixedly connected to the connecting section.

The embodiment of the application comprises the following technical effects: the length of the connecting section extending out of the bearing mechanism is increased through the adjusting piece, the abutting section slides on the first inclined plane, and the gap between the clamping ends of the two clamping jaws is reduced, so that the testing piece is locked. The adjusting piece only needs to apply smaller locking force, the risk that the clamping jaw breaks the test piece off with the fingers and thumb in the locking process and even leads to the test piece to fall off is reduced, and then the risk that the tensile test fixture damages the test piece in the locking process is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a tensile test fixture according to an embodiment of the present application.

Fig. 2 is a schematic view of a disassembled structure of the tensile test fixture according to an embodiment of the present application.

Fig. 3 is a schematic cross-sectional view illustrating a closed state of jaws of a tensile test fixture according to an embodiment of the present application.

Fig. 4 is a schematic cross-sectional view illustrating an opened state of the clamping jaws of the tensile testing fixture according to an embodiment of the present application.

Description of the main elements

Tensile test fixture 100

Support means 10

Support 11

Accommodating groove 111

Groove wall 112

Carrier 12

Stopper 13

Position limiting part 131

First portion 1311

Second portion 1312

Gap 14

Pivot pin 15

Clamping jaw 20

First inclined plane 21

Clamping surface 22

Second inclined plane 23

Pin hole 24

Pull rod 30

Sustaining section 31

Convex part 311

Sliding section 32

Connecting section 33

Connecting hole 331

Adjusting member 40

Pull ring 50

Test piece 90

First direction Z

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

It will be understood that when an element is referred to as being "mounted on" 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 "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

The embodiment of the application provides a tensile test fixture for clamping a test piece. The tension test fixture comprises a bearing mechanism, two clamping jaws, a pull rod and an adjusting piece. The bearing mechanism is provided with a sliding hole penetrating along a first direction. Each jaw is rotatably connected to the carrier mechanism to allow the jaws to open and close relative to each other, the jaws being spaced apart. The opposite sides of the two clamping jaws are respectively provided with a first inclined surface, and the distance between the two first inclined surfaces is gradually reduced along the first direction. The pull rod comprises a supporting section, a sliding section and a connecting section which are sequentially arranged along a first direction. The sliding section is arranged in the sliding hole in a penetrating way. The abutting section is located between the two clamping jaws, and two ends of the abutting section are respectively used for abutting against the two first inclined planes. The connecting section extends at least partially from the carrying means. The adjusting piece is connected to the connecting section and abuts against the bearing mechanism, and the adjusting piece is used for adjusting the length of the connecting section extending out of the bearing mechanism so as to drive the abutting section to slide on the first inclined plane and enable the two clamping jaws to clamp the test piece.

In the tensile test fixture, the length of the connecting section extending out of the bearing mechanism is increased through the adjusting piece, the abutting section slides on the first inclined plane, and the gap between the clamping ends of the two clamping jaws is reduced, so that the test piece is locked. The adjusting piece only needs to apply smaller locking force, the risk that the clamping jaw breaks the test piece off with the fingers and thumb in the locking process and even leads to the test piece to fall off is reduced, and then the risk that the tensile test fixture damages the test piece in the locking process is reduced. In the testing process, the length that regulating part and linkage segment stretched out bearing mechanism under the effect of pulling force further increases, make the clamping force of two clamping jaws rise and the tight test piece of more firm clamp along with the pulling force, reduce the risk that clamping jaw clamping force inadequately leads to the test piece slippage in the testing process, and the automatic application of force at pulling in-process clamping jaw can play the effect of adjusting the atress center, make the centre gripping of clamping jaw and atress center can keep unanimous, reduce the risk that the atress center squinted in the testing process, improve the accuracy of test.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1, the present application provides a tensile testing fixture 100 for performing tensile testing on a test piece 90. The test piece 90 may be, but is not limited to being, a component of the aluminum-plastic joint of the housing.

Referring to fig. 2, in some embodiments, the tensile test fixture 100 includes a support mechanism 10, two clamping jaws 20, a pull rod 30, and an adjusting member 40. The support mechanism 10 is provided with a slide hole 10a penetrating in the first direction Z. Each jaw 20 is pivotally connected to the support mechanism 10 such that the jaws 20 open or close relative to each other, and the jaws 20 are spaced apart. The opposite surfaces of the two clamping jaws 20 are respectively provided with a first inclined surface 21, and the distance between the two first inclined surfaces 21 is gradually reduced along the first direction Z. Specifically, each clamping jaw 20 has a fixed end (i.e., the pivot pin 15) and a clamping end (i.e., the clamping surface 22), and the distance between the two first inclined surfaces 21 decreases in the direction from the clamping end to the fixed end when the two clamping jaws 20 are closed relative to each other.

The pull rod 30 includes a holding section 31, a sliding section 32, and a connecting section 33, which are sequentially arranged along the first direction Z. The sliding section 32 is inserted into the sliding hole 10a and can slide in the sliding hole 10 a. The abutting section 31 is located between the two clamping jaws 20, and two ends of the abutting section 31 are respectively used for abutting against the two first inclined surfaces 21 to drive the two clamping jaws 20 to open or close. The connecting portion 33 extends at least partially from the support means 10.

The adjusting element 40 is connected to the connecting section 33 and abuts against the supporting mechanism 10, and the adjusting element 40 is used for adjusting the length of the connecting section 33 extending out of the supporting mechanism 10, so as to drive the abutting section 31 to slide on the first inclined plane 21 and enable the two clamping jaws 20 to clamp the test piece 90. Specifically, as the length of the connecting section 33 extending out of the carrying mechanism 10 increases (see fig. 3), the abutting section 31 moves along the first direction Z, and the abutting section 31 slides on the first inclined plane 21 and drives the two clamping jaws 20 to rotate, so that the gap between the clamping ends of the two clamping jaws 20 is reduced to clamp the test piece 90.

When the tensile test fixture 100 is used, the two clamping jaws 20 are in an open state, the clamping ends of the two clamping jaws 20 are aligned with the test piece 90, and the test piece 90 is located between the gaps of the clamping ends of the two clamping jaws 20. The adjusting member 40 is adjusted again to increase the length of the connecting section 33 extending out of the supporting mechanism 10, and the abutting section 31 slides on the first inclined surface 21 and reduces the gap between the clamping ends of the two clamping jaws 20 to lock the testing member 90. Finally, the connecting section 33 is connected to an external tensile device, which applies tensile force to the connecting section 33 and transmits the tensile force to the test piece 90 through the clamping jaws 20, so as to perform a tensile force test on the test piece 90. During the test, the length of the adjusting part 40 and the connecting section 33 extending out of the carrying mechanism 10 under the action of the tensile force is further increased, so that the clamping force of the two clamping jaws 20 can be increased along with the tensile force to clamp the test piece 90 more firmly.

In the tensile test fixture 100, the length of the connecting section 33 extending out of the bearing mechanism 10 is increased by the adjusting member 40, and the abutting section 31 slides on the first inclined surface 21 and reduces the gap between the clamping ends of the two clamping jaws 20, so as to lock the test piece 90. The adjusting member 40 only needs to apply a smaller locking force, so that the risk that the clamping jaw 20 breaks the test piece 90 in the locking process and even causes the test piece 90 to fall off is reduced, and the risk that the tensile test fixture 100 damages the test piece 90 in the locking process is further reduced. In the test process, the length of the adjusting part 40 and the connecting section 33 extending out of the bearing mechanism 10 under the action of the tensile force is further increased, so that the clamping force of the two clamping jaws 20 can rise along with the tensile force to clamp the test part 90 more firmly, the risk that the clamping force of the clamping jaws 20 does not lead to the slipping of the test part 90 in the test process is reduced, the automatic force application of the clamping jaws 20 in the pull process can play a role in adjusting the stress center, the clamping center and the stress center of the clamping jaws 20 can be kept consistent, the risk of stress center deviation in the test process is reduced, and the test accuracy is improved.

With continued reference to fig. 2, in some embodiments, the tensile testing fixture 100 further includes a pull ring 50, wherein the pull ring 50 is fixedly connected to the connecting section 33, so as to facilitate the connecting section 33 to be connected to an external tensile device through the pull ring 50. In some embodiments, the end of the connecting section 33 is provided with a connecting hole 331 extending along the axial direction of the pull rod 30, one end of the pull ring 50 extends into the connecting hole 331, and the pull ring 50 is connected with the hole wall of the connecting hole 331 through a screw thread.

Referring to fig. 2, in some embodiments, the supporting mechanism 10 includes a supporting member 11, a supporting member 12, and a limiting member 13 sequentially disposed along the first direction Z. The supporting member 11 is concavely provided with a receiving slot 111, and the two clamping jaws 20 are rotatably connected to a slot wall 112 of the receiving slot 111. In some embodiments, the receiving groove 111 includes two spaced apart groove walls 112, and the two clamping jaws 20 are partially received between the groove walls 112 and partially extend out of the receiving groove 111 to lock and clamp the test piece 90.

Referring to fig. 3, the sliding hole 10a is disposed in the carrier and is communicated with the accommodating groove 111. The sliding section 32 is inserted into the sliding hole 10a, the abutting section 31 is disposed in the accommodating groove 111 and located between the two clamping jaws 20, and the connecting section 33 is at least partially located between the bearing member 12 and the limiting member 13.

In some embodiments, the cross-section of the sliding hole 10a and the sliding section 32 perpendicular to the first direction Z is rectangular to reduce the risk of damage to the test piece caused by the sliding section 32 rotating in the sliding hole 10 a. It is understood that in other embodiments, the cross-section of the sliding hole 10a and the sliding section 32 perpendicular to the first direction Z may have other polygonal shapes, such as triangle, pentagon, hexagon, etc.

The adjusting element 40 is movably disposed between the supporting element 12 and the limiting element 13 along the first direction Z, and the adjusting element 40 is connected to the connecting section 33 and drives the connecting section 33 to move along the first direction Z. The adjusting member 40 is held against the carrier 12 during the process of locking the test piece 90, so that the two clamping jaws 20 lock the test piece 90. When an external tension device applies tension to the connecting section 33, the adjusting piece 40 drives the connecting section 33 to move along the first direction Z, so that the clamping force of the two clamping jaws 20 can be increased along with the tension to clamp the test piece 90 more firmly.

In some embodiments, the adjusting member 40 is connected to the connecting section 33 by a screw thread, specifically, the connecting section 33 is provided with a screw thread on its outer circumference, and the adjusting member 40 is a nut that is connected to the screw thread on the outer circumference of the connecting section 33 in a matching manner.

Referring to fig. 3, in some embodiments, the position-limiting member 13 includes at least two position-limiting portions 131 disposed at intervals. Each stopper 131 includes a first portion 1311 and a second portion 1312, and the first portion 1311 is connected to the carrier 12 at one end and extends in the first direction Z. The second portion 1312 is connected to an end of the first portion 1311 remote from the carrier 12 and extends in the axial direction of the tie rod 30 to limit the position of the adjustment member 40. A gap 14 of a predetermined distance is provided between the second portion 1312 and the adjustment member 40. The predetermined distance is a distance that the adjusting member 40 moves in the first direction Z when the external tension device applies tension to the connecting section 33.

Referring to fig. 3, in some embodiments, two ends of the supporting section 31 are respectively provided with a protrusion 311 extending perpendicular to the first direction Z. Each protrusion 311 abuts against a first inclined surface 21, so as to improve the stability of the two ends of the abutting section 31 abutting against the first inclined surfaces 21. In some embodiments, the surface of each protrusion 311 contacting the first inclined surface 21 is an arc surface, so that the protrusion 311 is tangent to the first inclined surface 21, and the stability of the sliding of the protrusion 311 on the first inclined surface 21 is improved.

With continued reference to fig. 3, in some embodiments, the opposing surfaces of the two jaws 20 are further provided with a clamping surface 22 and a second bevel 23, respectively. Along the first direction Z, the clamping surface 22, the second inclined surface 23 and the first inclined surface 21 on the same clamping jaw 20 are arranged in sequence, and the distance between the two second inclined surfaces 23 is gradually increased. The clamping jaw 20 receives the force of the abutting section 31 through the first inclined surface 21, and transmits the force to the clamping surfaces 22 through the second inclined surface 23, and the two clamping surfaces 22 are used for locking or clamping the test piece 90. The clamping surfaces 22 are the clamping ends of the jaws 20. The stability of the clamping jaw 20 for locking or clamping the test piece 90 is improved by the cooperation of the first inclined surface 21, the second inclined surface 23 and the clamping surface 22.

Referring to fig. 4, in some embodiments, two ends of the supporting section 31 are further used for supporting two second inclined planes 23, respectively. The abutting section 31 moves in the opposite direction of the first direction Z, and the abutting section 31 slides on the second inclined surface 23 and drives the two clamping jaws 20 to rotate, so that the gap between the clamping ends of the two clamping jaws 20 is increased, and the clamping ends of the two clamping jaws 20 are aligned with the test piece 90.

In some embodiments, the gripping surface 22 is provided with spaced apart sharp teeth to facilitate the locking or gripping of the test piece 90. It will be appreciated that in other embodiments, the gripping surface 22 is provided with a friction layer to facilitate locking or gripping of the test piece 90 by increasing the coefficient of friction of the friction layer.

With continued reference to fig. 4, in some embodiments, each jaw 20 is provided with a pin hole 24. The pin hole 24 is provided at the folding point of the clamping jaw 20 at the first inclined surface 21 and the second inclined surface 23. The bearing mechanism 10 is provided with two rotating shaft pins 15 arranged at intervals, and the pin hole 24 of each clamping jaw 20 penetrates through the rotating shaft pins 15, so that each clamping jaw 20 is rotatably connected to the bearing mechanism 10, and the abutting section 31 is convenient for driving the two clamping jaws 20 to open or close.

Specifically, in some embodiments, the pivot pin 15 is connected to the slot wall 112, and the pivot pin 15 is in interference fit with the slot wall 112 to reduce the risk of the force center of the clamping jaw 20 shifting during the stress test.

In some embodiments, the tensile test fixture 100 is symmetrically disposed along the axis of the sliding hole 10a, so that the clamping center and the force-receiving center of the clamping jaw 20 can be kept consistent, and the stability and accuracy of the test can be improved. Specifically, the bearing mechanism 10, the two clamping jaws 20, the pull rod 30 and the adjusting piece 40 are all symmetrically arranged along the axis of the sliding hole 10 a.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present application and are not to be taken as limiting the present application, and that suitable changes and modifications to the above embodiments are within the scope of the present disclosure as long as they are within the spirit and scope of the present application.

Claims

1. A tensile test fixture is used for clamping a test piece and comprises a bearing mechanism and two clamping jaws, wherein the bearing mechanism is provided with a sliding hole penetrating along a first direction, each clamping jaw is rotatably connected to the bearing mechanism so as to enable the two clamping jaws to be opened and closed relatively, the two clamping jaws are arranged at intervals, and the opposite surfaces of the two clamping jaws are respectively provided with a first inclined surface; along first direction, two the interval between the first inclined plane diminishes gradually its characterized in that: the tensile test fixture further comprises:

the pull rod comprises a butting section, a sliding section and a connecting section which are sequentially arranged along the first direction, the sliding section is arranged in the sliding hole in a penetrating mode, the butting section is located between the two clamping jaws, two ends of the butting section are respectively used for butting against the two first inclined planes, and at least part of the connecting section extends out of the bearing mechanism; and

the adjusting piece is connected to the connecting section and abutted against the bearing mechanism, and is used for adjusting the length of the connecting section extending out of the bearing mechanism so as to drive the abutting section to slide on the first inclined plane and enable the two clamping jaws to clamp the test piece.

2. The tension test fixture of claim 1, wherein: bear the mechanism and include the edge support piece, hold carrier and locating part that first direction set gradually, the concave holding tank that is equipped with of support piece, two the clamping jaw rotationally connect in the cell wall of holding tank, the slide opening is located hold in the carrier and with the holding tank intercommunication, the regulating part can be followed first direction is located movably hold the carrier with between the locating part.

3. The tension test fixture of claim 2, wherein: the locating part includes two at least spacing portions that the interval set up, each spacing portion includes first portion and second portion, first portion one end connect in hold the piece and follow first direction extends, the second portion connect in first portion keep away from hold the one end of piece, and the orientation the axis direction of pull rod extends, the second portion with be equipped with the clearance of predetermineeing the distance between the regulating part.

4. The tension test fixture of claim 1, wherein: and two ends of the abutting section are respectively provided with a convex part extending along the direction vertical to the first direction, and each convex part abuts against one first inclined plane.

5. The tension test fixture of claim 4, wherein: the surface of the convex part contacting with the first inclined plane is an arc-shaped surface.

6. The tension test fixture of claim 1, wherein: two the one side that the clamping jaw is relative still is equipped with clamping face and second inclined plane respectively, follows first direction, it is same on the clamping jaw the clamping face the second inclined plane with first inclined plane is arranged in proper order, two interval between the second inclined plane increases gradually, two the clamping face is used for pressing from both sides tightly the test piece.

7. The tension test fixture of claim 6, wherein: each clamping jaw is provided with a pin hole, the pin hole is formed in the bending point of the clamping jaw on the first inclined surface and the second inclined surface, the bearing mechanism is provided with two rotating shaft pins which are arranged at intervals, and the pin hole of each clamping jaw penetrates through the rotating shaft pins.

8. The tension test fixture of claim 1, wherein: the adjusting piece is connected with the connecting section through threads.

9. The tension test fixture of claim 1, wherein: the cross sections of the sliding holes and the sliding sections, which are perpendicular to the first direction, are rectangular.

10. The tension test fixture of claim 1, wherein: the tensile test fixture further comprises a pull ring, and the pull ring is fixedly connected to the connecting section.