Pipe tension and compression fatigue device

Abstract

The utility model discloses a pipe tension and compression fatigue device, which belongs to the technical field of pipe detection, and comprises a pipe body and two clamps, opposite ends of the two clamps are provided with first holes, the pipe body is positioned between the two clamps, and two ends of the pipe body are respectively positioned in the two first holes. Internal threads are formed in the inner walls of the two first holes; when the pipe tension-compression fatigue device is used, the internal threads are in contact with the pipe body, so that the two ends of the pipe body are subjected to uniform pressing force, sufficient friction force is achieved, uniform clamping force can be provided for the pipe body, the pipe tension-compression fatigue device is simple and practical in structure and convenient to operate, and the centering effect of the pipe tension-compression fatigue device is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe detection, and particularly relates to a pipe tensile and compressive fatigue device. Background Art

[0002] In the prior art, fatigue is an important mechanical property parameter of materials. Testing the fatigue performance of raw materials is of great significance for predicting the service performance of structural components. At present, the following problems exist in the pipe tensile and compressive fatigue device:

[0003] 1. The structure is cumbersome, the operation steps are relatively complex, and it is difficult to ensure the centering effect of the structure after installation;

[0004] 2. The structure cannot provide a compressive force, so the tensile and compressive fatigue test cannot be carried out;

[0005] 3. The clamping part of the pipe sample cannot provide a uniform clamping force;

[0006] 4. Under high-temperature conditions, a longer pipe sample is required to ensure that the clamped part of the fixture is outside the high-temperature furnace, so more raw materials need to be consumed. Summary of the Utility Model

[0007] The purpose of the utility model is to provide a pipe tensile and compressive fatigue device to solve the problems existing in the existing pipe tensile and compressive fatigue device, such as cumbersome structure, complex operation, difficult to ensure the centering effect of the structure, unable to provide a compressive force for the tensile and compressive fatigue test, unable to provide a uniform clamping force at the clamping part of the pipe sample, and more raw materials need to be consumed under high-temperature conditions.

[0008] To solve the above technical problems, the utility model provides a pipe tensile and compressive fatigue device, which includes a pipe body and two fixtures. The opposite ends of the two fixtures are both provided with first holes, the pipe body is located between the two fixtures, and its two ends are respectively located in the two first holes;

[0009] Internal threads are provided on the inner walls of the two first holes.

[0010] Optionally, the opposite ends of the two fixtures are both provided with second holes, and ejector pins are arranged in the two second holes.

[0011] Optionally, the height of the ejector pin is greater than the depth of the second hole.

[0012] Optionally, notch openings are provided on the sides of the two fixtures.

[0013] Optionally, a plurality of threaded holes are provided on the front and rear end faces of the two fixtures.

[0014] Optionally, two relatively-positioned semi-circular holes are further provided on the sides of the two fixtures.

[0015] Optionally, the material of the two jigs is DZ125.

[0016] In a pipe tensile-compressive fatigue device provided by the present utility model, it includes a pipe body and two jigs. One end of each of the two jigs is provided with a first hole. The pipe body is located between the two jigs, and its two ends are respectively located in the two first holes. Inner threads are provided on the inner walls of the two first holes; when using the pipe tensile-compressive fatigue device, the two ends of the pipe body are uniformly pressed through the contact between the inner threads and the pipe body, and have sufficient frictional force, so as to provide uniform clamping force for the pipe body, and the structure is simple and practical, easy to operate, and ensures its centering effect. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the pipe tensile-compressive fatigue device provided by the present utility model;

[0018] Figure 2 is a partial schematic structural diagram of the pipe tensile-compressive fatigue device provided by the present utility model;

[0019] Figure 3 is a schematic structural diagram of the jig provided by the present utility model. Detailed Embodiments

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this utility model belongs. The terms used in the specification of this utility model herein are for the purpose of describing specific embodiments only and are not intended to limit this utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0023] This utility model provides a pipe tensile-compressive fatigue device, the structure of which is as Figures 1 to 3 shown, including a pipe body 1 and two clamps 2. One end of each of the two clamps 2 is provided with a first hole 26. The pipe body 1 is located between the two clamps 2 and its two ends are respectively located in the two first holes 26. Internal threads 24 are provided on the inner walls of the two first holes 26. When using the pipe tensile-compressive fatigue device, the two ends are uniformly pressed by contacting the internal threads 24 with the pipe body 1, and there is sufficient frictional force, so that a uniform clamping force can be provided for the pipe body 1, and the structure is simple and practical, the operation is convenient, and the centering effect is ensured.

[0024] Further, a second hole 25 is provided at the other end of each of the two clamps 2 facing each other, and a ejector pin 3 is provided in each of the two second holes 25, which is convenient for the testing machine to apply pressure to fix the pipe body 1.

[0025] Further, the height of the ejector pin 3 is greater than the depth of the second hole 25, so that the testing machine can apply pressure to the two ejector pins 3 respectively.

[0026] Further, a notch 22 is provided on the side surface of each of the two clamps 2.

[0027] Further, a plurality of threaded holes 23 are provided on the front end face and the rear end face of each of the two clamps 2 for installing bolts.

[0028] Further, two semi-circular holes 21 are provided on the side surface of each of the two clamps 2 and are opposite to each other in position.

[0029] Further, the material of the two clamps 2 is DZ125, which has high-temperature resistance and can reduce the loss of the pipe body 1.

[0030] The working principle of this utility model is as follows: First, the two ends of the pipe body 1 are respectively placed in the two first holes 26, then bolts are installed in a plurality of threaded holes 23 to fix the pipe body 1, and then the whole is threadedly connected to the testing machine. The top core in the testing machine can apply pressure to the two ejector pins 3 respectively to fix the two ends of the pipe body 1.

[0031] During the whole process, due to the semi-circular holes 21 opened on both sides of the fixture 2 and the structure of the notch 22 with a special shape, the fixture 2 is formed into two halves and has a certain degree of deformation ability. Therefore, after the pipe body 1 is placed in the fixture body and the fastening bolts are tightened, the fixture 2 deforms inward, so that the internal thread 24 inside the hole contacts the pipe sample and presses it tightly. The pipe body 1 is evenly subjected to the pressing force and has sufficient frictional force, so that a uniform clamping force can be provided for the pipe body 1; a second hole 25 is opened at the other end of the fixture, and a ejector pin 3 is arranged inside it. The fixture 2 is connected to the testing machine by threads, and a pressure that does not damage the pipe body 1 is applied to the ejector pin 3 by the testing machine to fix it, and the gap between the pipe body 1 and the fixture 2 is eliminated. Therefore, during the tensile-compressive fatigue test, the fixture 2 can not only provide sufficient tensile force, but also provide stable pressure, preventing gaps from appearing during the tensile-compressive fatigue test, so that the test results are abnormal or even invalid.

[0032] The above description is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the field of the present invention according to the above disclosure shall fall within the protection scope of the claims.

Claims

1. A pipe tensile and compressive fatigue device, comprising a pipe body (1) and two clamps (2), characterized in that, At one end where the two fixtures (2) face each other, a first hole (26) is formed. The pipe body (1) is located between the two fixtures (2), and its two ends are respectively located in the two first holes (26). Internal threads (24) are formed on the inner walls of the two first holes (26).

2. The tube drawing and compression fatigue device according to claim 1, characterized in that, At the other end where the two fixtures (2) face each other, a second hole (25) is formed in each. A ejector pin (3) is provided in each of the two second holes (25).

3. The pipe drawing and pressing fatigue device according to claim 2, characterized in that, The height of the ejector pin (3) is greater than the depth of the second hole (25).

4. The tube drawing and pressing fatigue device according to claim 1, wherein, Notches (22) are formed on the sides of the two fixtures (2).

5. The tube drawing and compression fatigue device according to claim 1, characterized in that, A number of threaded holes (23) are formed on the front and rear end faces of the two fixtures (2).

6. The tube drawing and pressing fatigue device according to claim 1, characterized in that Two semi-circular holes (21) that are opposite in position are further formed on the sides of the two fixtures (2).

7. The pipe drawing and pressing fatigue device according to claim 1, characterized in that The two fixtures (2) are made of DZ125.

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