CN219212896U

CN219212896U - Clamp

Info

Publication number: CN219212896U
Application number: CN202320091089.1U
Authority: CN
Inventors: 蒋伟
Original assignee: EMS Chemie Suzhou Ltd
Current assignee: EMS Chemie Suzhou Ltd
Priority date: 2023-01-18
Filing date: 2023-01-18
Publication date: 2023-06-20
Anticipated expiration: 2033-01-18

Abstract

The present utility model relates to a clamp for securing a sample to be torque tested, the clamp comprising a first half and a second half, the first half comprising a first recess and the second half comprising a second recess, such that after fastening the first half and the second half together, a cavity is defined by the first recess and the second recess for receiving the sample, and an inner surface of the cavity of the clamp is spaced apart from an outer surface of the body of the sample. The clamp disclosed by the utility model can reduce the influence of the clamp on the performance of a sample, so that the test can be performed more quickly and accurately.

Description

Clamp

Technical Field

The utility model relates to a torque performance test of plastic materials. In particular, the present utility model relates to a clamp for securing a torque test specimen ready for use.

Background

This section provides background information related to the present application, which does not necessarily constitute prior art.

In the field of plastic product manufacturing, it is often necessary to perform experiments on samples, such as torque tests, to understand various properties of materials and products. The current common torque testing method is to directly clamp a sample by using a clamp for torque testing. In testing materials for example for screw properties, the sample is usually cylindrical and the clamp grips the sample from the outside. The sample piece is provided with a central threaded hole for carrying out threaded connection with the torque testing rod, and carrying out torque testing on the sample piece.

This method has little effect on metal samples, such as copper samples. However, for the plastic sample, as the rigidity of the plastic sample and the rigidity of the metal sample are different, the plastic sample can be distorted by directly clamping the plastic sample by using the clamp, and the clamping force is not well controlled, so that the final torque value obtained by the test has larger fluctuation, and the data accuracy is affected. Therefore, the conventional clamping tool is only suitable for clamping a sample made of a material having high rigidity (small deformation, small stress) such as metal.

Disclosure of Invention

The object of the present utility model is to solve one or more of the technical problems mentioned above.

In particular, it is an object of the present utility model to provide a clamp that can reduce the impact of the clamp on the performance of the sample, thereby enabling a more rapid and accurate test.

According to one aspect of the present utility model there is provided a clamp for securing a sample to be torque tested, the clamp comprising a first half and a second half, the first half comprising a first recess and the second half comprising a second recess, such that after the first half and the second half are secured together, a cavity is defined by the first recess and the second recess for receiving the sample, and an inner surface of the cavity of the clamp is spaced from an outer surface of the body of the sample.

According to one aspect of the utility model, the clamp is made of metal and the sample is made of plastic.

According to one aspect of the utility model, a clamp stop is provided on the inner surface of the first recess and the inner surface of the second recess for form-fitting with a sample stop provided on the outer surface of the sample.

According to one aspect of the utility model, the clamp stop includes one or more protrusions and the sample stop of the sample includes one or more recesses corresponding to and form-fitting with the one or more protrusions of the clamp stop of the clamp.

According to an aspect of the present utility model, the cavity is cylindrical, and the jig stopper includes a plurality of protrusions aligned with each other in an axial direction of the cavity and in a circumferential direction, or alternatively, the plurality of protrusions are staggered with each other in the axial direction of the cavity and/or in the circumferential direction.

The cavity is cylindric, and the body of sample is cylindric, and the first internal diameter of the internal surface of anchor clamps's cavity is greater than the first external diameter of the surface of sample's body.

The second inner diameter of the imaginary cylinder where the innermost side of the convex portion in the radial direction is located is smaller than the first outer diameter of the outer surface of the body and is larger than the second outer diameter of the imaginary cylinder where the innermost side of the concave portion in the radial direction is located.

According to one aspect of the utility model, the first half and the second half of the clamp are fastened together with a fastener.

According to one aspect of the utility model, the fastener is a bolt, the first half being provided with, for example, two bolt holes, the second half being provided with threaded holes corresponding to the bolt holes, the bolt being threadedly engaged with the threaded holes through the bolt holes.

According to one aspect of the utility model, the first half is provided with two bolt holes, which are located on both sides of the first recess.

By using the clamp, the clamp clamps the clamp to fix the sample, and the clamp mainly bears the clamping force exerted by the clamp, so that the influence on the experimental result caused by the extrusion deformation of the plastic sample when the clamp clamps is eliminated. Therefore, the influence of external force on the material performance of the sample is reduced, a more accurate torque test result can be obtained, more accurate material performance data can be obtained, and further, the test and the design of plastic products can be performed more quickly and accurately.

Drawings

The foregoing and additional features and characteristics of the present application will become more apparent from the following detailed description, taken in conjunction with the accompanying drawings, which are merely exemplary and not necessarily drawn to scale. Like reference numerals are used to designate like parts throughout the accompanying drawings, in which:

FIG. 1 is a perspective view of a clamp according to the present utility model;

FIG. 2 is an exploded perspective view of a clamp according to the present utility model; and

fig. 3 is a top view of a clamp according to the present utility model.

Detailed Description

Preferred embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. The following description is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses.

Fig. 1 is a perspective view of a clamp according to the present utility model. Fig. 2 is an exploded perspective view of a clamp according to the present utility model. The jig 10 of the present utility model is made of, for example, a metal as a first material (higher rigidity). The clamp 10 comprises a first half 11 and a second half 13. The first half 11 comprises a first recess 12, for example semi-circular, and the second half 13 comprises a second recess 14, for example semi-circular, so that after fastening the first half 11 and the second half 13 together, a cavity 15, for example cylindrical, is defined by the first recess 12 and the second recess 14 for receiving the sample piece 20.

A clamp stop is provided on the inner surface of the first recess 12 and the inner surface of the second recess 14. As shown, the clamp stop includes one or more bosses 16. As shown, one or more of the projections 16 are aligned with each other in the axial direction as well as in the circumferential direction. One skilled in the art will appreciate that one or more of the projections 16 can also be staggered with respect to one another in the axial direction and/or in the circumferential direction.

The first half 11 and the second half 13 of the clamp 10 can be fastened together with fasteners. Preferably, the fastener is a bolt 19, for example. As shown in fig. 2, the first half 11 is provided with, for example, two bolt holes 17. The bolt holes 17 are located on both sides of the first recess 12. The second half 13 is provided with threaded holes 18 corresponding to the bolt holes 17. The bolt hole 17 is a through hole having no internal thread, and the screw hole 18 has an internal thread. A bolt 19 is threaded through the bolt hole 17 and into engagement with the threaded hole 18. After the first half 11 and the second half 13 are fastened together, the heads of the bolts 19 do not protrude from the side surfaces of the first half 11. Those skilled in the art will appreciate that the first and

second halves

11, 13 of the clamp 10 can be secured together using, for example, a form fit, snap fit, or the like, in addition to the use of a bolt fastener.

The body 22 of the sample 20 is, for example, cylindrical and made of plastic as the second material (low rigidity). The outer surface of the body 22 of the sample 20 is provided with a sample stop corresponding to the clamp stop of the clamp 10. The sample stop of the sample 20 is form-fitted with the clamp stop of the clamp 10 to limit movement of the sample 20 in the circumferential direction, in the axial direction, and in a plane perpendicular to the axial direction of the sample 20. The sample stop of the sample 20 includes one or more recesses 24 that correspond to and form-fit with one or more protrusions 16 of the clamp stop of the clamp 10.

The sample 20 is also provided with a central threaded bore 26 for threaded connection with a torque test stick (not shown) for torque testing the sample 20.

Fig. 3 is a top view of a clamp according to the present utility model. As shown, after the jig 10 clamps the sample 20, a minute gap 30 is left between the two, so that the sample 20 is not deformed by external force. In particular, the inner surfaces of the cavity 15 of the fixture 10 (i.e., the inner surfaces of the first recess 12 and the second recess 14) are spaced apart from the outer surface of the body 22 of the sample 20, thereby forming a gap 30. More specifically, the inner diameter of the inner surface of the cavity 15 of the jig 10, where the convex portion 16 is absent (referred to as a first inner diameter), is larger than the outer diameter of the outer surface of the body 22 of the sample 20, where the concave portion 24 is absent (referred to as a first outer diameter). The inner diameter of an imaginary cylinder where the innermost side of the convex portion 16 in the radial direction (i.e., the inner surface of the cavity 15 of the jig 10 having the inner diameter at the convex portion 16, referred to as a second inner diameter) is smaller than the first outer diameter of the outer surface of the body 22 and larger than the outer diameter of an imaginary cylinder where the recess 24 is the innermost side in the radial direction (i.e., the outer diameter of the outer surface of the body 22 of the sample 20 having the recess 24, referred to as a second outer diameter).

With the clamp 10 of the present utility model, the clamp (not shown) clamps the clamp 10 to fix the sample 20, and the clamp 10 mainly receives the clamping force applied by the clamp, so that the impact of the extrusion deformation of the clamp 10 on the sample 20 during clamping is eliminated. Therefore, the influence of external force (clamping force of the clamp) on the material performance of the sample piece 20 is reduced, a more accurate torque test result can be obtained, more accurate material performance data can be obtained, and further, the plastic product can be tested and designed more quickly and accurately.

It should be appreciated that the various embodiments and features can be further designed and modified in a wide variety of different ways.

The wire stripping tool according to the preferred embodiment of the present utility model has been described above in connection with the specific embodiments. It will be understood that the above description is by way of example only and not by way of limitation, and that various modifications and alterations will occur to those skilled in the art in light of the above description without departing from the scope of the utility model. Such variations and modifications are also included within the scope of the present application.

Claims

1. A clamp (10) for securing a sample (20) ready for torque testing, characterized in that the clamp (10) comprises a first half (11) and a second half (13), the first half (11) comprising a first recess (12) and the second half (13) comprising a second recess (14), such that after fastening the first half (11) and the second half (13) together, a cavity (15) is defined by the first recess (12) and the second recess (14) for receiving the sample (20), and an inner surface of the cavity (15) of the clamp (10) is spaced apart from an outer surface of a body (22) of the sample (20).

2. The clamp (10) according to claim 1, characterized in that the clamp (10) is made of metal and the sample is made of plastic.

3. The clamp (10) of claim 1, wherein clamp stops are provided on the inner surface of the first recess (12) and the inner surface of the second recess (14) for form-fitting with sample stops provided on the outer surface of the sample (20).

4. A clamp (10) according to claim 3, wherein the clamp stop comprises one or more protrusions (16), the sample stop of the sample (20) comprising one or more recesses (24) corresponding to and form-fitting with one or more of the protrusions (16) of the clamp stop of the clamp (10).

5. The jig (10) according to claim 4, wherein the cavity (15) is cylindrical, the jig stopper comprises a plurality of the protrusions (16), the plurality of protrusions (16) are aligned with each other in an axial direction and in a circumferential direction of the cavity, or the plurality of protrusions (16) are staggered with each other in the axial direction and/or in the circumferential direction of the cavity.

6. The jig (10) according to claim 4, wherein the cavity (15) is cylindrical, the body (22) of the sample (20) is cylindrical, and a first inner diameter of an inner surface of the cavity (15) of the jig (10) is larger than a first outer diameter of an outer surface of the body (22) of the sample (20).

7. The jig (10) according to claim 6, wherein a second inner diameter of an imaginary cylinder where an innermost radially innermost side of the convex portion (16) is located is smaller than the first outer diameter of the outer surface of the body (22) and larger than a second outer diameter of an imaginary cylinder where an innermost radially side of the concave portion (24) is located.

8. The clamp (10) according to claim 1, characterized in that the first half (11) and the second half (13) of the clamp (10) are fastened together with fasteners.

9. The clamp (10) according to claim 8, characterized in that the fastener is a bolt (19), the first half (11) is provided with a bolt hole (17), the second half (13) is provided with a threaded hole (18) corresponding to the bolt hole (17), and the bolt (19) is threaded through the bolt hole (17) with the threaded hole (18).

10. The clamp (10) according to claim 9, characterized in that the first half (11) is provided with two of the bolt holes (17), two of the bolt holes (17) being located on both sides of the first recess (12).