CN205483804U - Plastic conduit hoop anchor clamps for strength test - Google Patents

Abstract

The utility model discloses a fixture for testing the circumferential strength of a plastic pipeline, which can conveniently measure the circumferential strength of the pipeline, and has the characteristics of simple structure and convenient use. It consists of two parts with mirror image symmetry, each part includes two ribs, two screws, two sleeves, a pull plate and a semi-cylindrical clamp body; each screw passes through the two ribs and is fitted with a corresponding nut, the sleeve is set on the screw and supported between the two ribs; the pull plate is connected to one sleeve, and the semi-cylindrical clamp body is connected to the other sleeve; Two parts of the semi-cylindrical clamping body are arranged adjacently and form a cylindrical clamping body. The fixture for testing the hoop strength of plastic pipes of the utility model can conveniently measure the hoop strength of the pipe through the cooperation of ribs, screws, sleeves, pull plates and semi-cylindrical clamp bodies, and has the advantages of simple structure and convenient use. specialty.

Description

A fixture for testing the hoop strength of plastic pipes

technical field

The utility model relates to a pipeline mechanical property testing device, in particular to a fixture for testing the circumferential strength of plastic pipelines which is convenient for detecting and detecting the circumferential strength of plastic pipelines.

Background technique

Compared with metal, plastic has obvious advantages in comprehensive energy saving and environmental protection, and has strong corrosion resistance. It is widely used in urban public systems and chemical anticorrosion fields, especially in urban buried gas pipes, chemical pipelines, various In the storage tank of similar corrosive media, "replacing steel with plastic" is basically realized, and the excellent comprehensive performance solves the corrosion problem of traditional metal materials. Data show that in Europe, America, Japan and other developed countries, more than 90% of urban buried gas pipes use polyethylene gas pipes; most industrial corrosive media are stored in plastic storage tanks. The fields of application and the pace of development of plastic pipes and containers are astounding.

Generally, during or after the production of plastic pipes, strict tests must be carried out on its various properties, in order to optimize the process and supervise the product performance. Among them, mechanical properties are an important detection parameter, and tensile strength is one of the most important and basic properties in the mechanical properties of plastics. Therefore, tensile mechanical properties are often used as a means of testing the strength of plastic pipes.

At present, in the testing experiments of the mechanical properties of plastic pipes, the axial strength of the pipes is usually measured by the axial tensile test of the axial samples of the pipes. However, in practical applications, the axial force of the pipe is generally small. At the same time, according to the stress analysis theory, it is found that the hoop stress of the pipe under the actual working pressure is twice the axial stress, and a large number of production accidents also show that the plastic pipe is broken. Or leakage is usually mainly caused by insufficient hoop strength, so more attention should be paid to the hoop strength of the pipeline.

However, to accurately and easily measure the hoop tensile strength of plastic pipes is a problem faced in the testing process of the hoop mechanical properties of plastic pipes. The most important problem is that the sample is in the form of a ring , It is obviously inappropriate to use traditional tensile fixtures and methods. Obviously, it is the simplest method to stretch the ring specimen along the hoop direction with the help of the existing tension principle, but there is currently no jig for hoop tension.

Utility model content

In order to overcome the above-mentioned technical defects, the purpose of this utility model is to provide a plastic pipe hoop strength test fixture that can easily measure the hoop strength of the pipe, and has the characteristics of simple structure and easy use.

In order to achieve the above object, the utility model is realized through the following technical solutions: the fixture for testing the circumferential strength of plastic pipes includes two mirror-symmetrical parts, each part includes two ribs, two screws, two sleeves, a Pulling plate and a semi-cylindrical clamp body; each screw passes through two ribs and is matched with a corresponding nut, and the sleeve is set on the screw and supported between the two ribs; the pulling plate Connected to one sleeve, the semi-cylindrical clamping body is connected to the other sleeve; the semi-cylindrical clamping bodies of the two parts are arranged close to each other to form a cylindrical clamping body.

The cylindrical surface of the semi-cylindrical clamp body is provided with an annular groove for convenient plastic ring fitting.

The pull plate is welded on the sleeve.

The arc surface of the semi-cylindrical holder body is made of ground and finished stainless steel.

The beneficial effects of the utility model are: the fixture for testing the circumferential strength of the plastic pipeline of the utility model can conveniently measure the circumferential strength of the pipeline through the cooperation of ribs, screws, sleeves, pull plates and semi-cylindrical clamp bodies, etc. , and has the characteristics of simple structure and convenient use. Since the cylindrical surface of the semi-cylindrical clamp is provided with an annular groove for convenient plastic ring fitting, the plastic ring of the test sample can be conveniently put on, and it is not easy to shake and shift, which improves the accuracy of detection. Since the pull plate is welded on the sleeve, it is not easy to shake and shift, which improves the accuracy of detection. Because the arc surface of the semi-cylindrical clamp body is made of grinding and finishing stainless steel material, the semi-cylindrical clamp body has a smaller surface roughness, so as to reduce the friction between the pipe wall and the semi-cylindrical clamp body during the experiment , thereby improving the detection accuracy.

Description of drawings

Fig. 1 is the structural representation of the fixture of the utility model plastic pipeline hoop strength test;

In the figure, 1—rib plate, 2—screw, 3—sleeve, 4—nut, 5—semi-cylindrical clamp body, 6—drawing plate.

detailed description

The utility model will be further described below in conjunction with the accompanying drawings, but the protection scope of the utility model is not limited to the following description.

As shown in Figure 1, the fixture for testing the hoop strength of plastic pipes of the present invention includes two mirror-symmetrical parts, each part includes two ribs 1, two screws 2, two sleeves 3, a pulley Plate 6 and a semi-cylindrical clamp body 5; each screw 2 passes through two ribs 1 and is matched with a corresponding nut 4, and the sleeve 3 is set on the screw 2 and supported between the two ribs 1 between; the pull plate 6 is connected to one sleeve 3, and the semi-cylindrical clamp body 5 is connected to the other sleeve 3; the semi-cylindrical clamp body 5 of the two parts is arranged close to each other, and forms a cylindrical clamp body . The fixture for testing the hoop strength of the plastic pipe of the utility model can conveniently measure the hoop strength of the pipe through the cooperation of the rib plate 1, the screw 2, the sleeve 3, the pull plate 6 and the semi-cylindrical clamp body 5, etc., and has the advantages of The utility model has the characteristics of simple structure and convenient use. When in use, put the plastic ring sample on the two semi-cylindrical clamp bodies 5, then tighten the screw 2 and the nut 4, and lock the sleeve 3 provided with the semi-cylindrical clamp body 5 between the two ribs 1 It is quite convenient to install a detection force sensor on one of the pull plates 6 and pull the two pull plates 6 to detect the hoop strength.

Preferably, the cylindrical surface of the semi-cylindrical clamp body 5 is provided with an annular groove for the plastic ring to fit easily, so that the plastic ring of the test sample can be easily put on, and it is not easy to shake and shift, which improves the accuracy of the test.

Preferably, the pull plate 6 is welded on the sleeve 3, which is not easy to shake and shift, and improves the accuracy of detection.

As preferably, the arc surface of the semi-cylindrical clamp body 5 is made of grinding and finishing stainless steel material, so that the semi-cylindrical clamp body 5 has a smaller surface roughness, so as to reduce the contact between the tube wall and the semi-cylindrical tube wall during the experiment. The friction force of the clamp body 5 improves the detection accuracy.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (4)

1. A fixture for testing the hoop strength of plastic pipes, characterized in that it includes two mirror-symmetrical parts, each part includes two ribs (1), two screws (2), two sleeves (3 ), a pull plate (6) and a semi-cylindrical clamp body (5); each screw (2) passes through two ribs (1) and is matched with a corresponding nut (4), and the sleeve (3 ) is set on the screw (2) and supported between two ribs (1); the pull plate (6) is connected to a sleeve (3), and the semi-cylindrical clamp body (5) Connected to the other sleeve (3); the semi-cylindrical clamp body (5) of the two parts is arranged close together and forms a cylindrical clamp body. 2. A fixture for testing the hoop strength of plastic pipes according to claim 1, characterized in that: the cylindrical surface of the semi-cylindrical fixture body (5) is provided with an annular groove for easy plastic ring fitting. 3. A fixture for testing the hoop strength of plastic pipes according to claim 1 or 2, characterized in that the pull plate (6) is welded to the sleeve (3). 4. The fixture for testing the hoop strength of plastic pipes according to claim 3, characterized in that: the arc surface of the semi-cylindrical fixture body (5) is made of ground and finished stainless steel.