Clamp device for tensile test of large-diameter high-wall-thickness thermoplastic pipe

Abstract

The utility model relates to the technical field of tensile test tools, in particular to a large-diameter high-wall-thickness thermoplastic pipe tensile test clamp device which comprises a transverse plate, two vertical clamping plates and two arc-shaped clamping plates, the two vertical clamping plates are connected to the two opposite sides of the transverse plate respectively, and the arc-shaped clamping plates are arranged at the ends, away from the transverse plate, of the vertical clamping plates. A pipe clamping opening with the width gradually reduced is formed between the two arc-shaped clamping plates, the minimum width of the pipe clamping opening is 20 mm, the maximum width of the pipe clamping opening is 50 mm, a stretching connecting part is arranged on the side, away from the pipe clamping opening, of the transverse plate, and the stretching connecting part is used for being detachably assembled to a tension testing machine. According to the clamp device for the tensile test of the large-diameter high-wall-thickness thermoplastic pipe, the dumbbell-shaped end structure of the large-diameter high-wall-thickness thermoplastic pipe can be exactly matched and clamped, mounting and dismounting are very convenient, a clamp is not prone to slipping in the test process, experimental data are more stable, the precision is high, the test efficiency is high, and use is more convenient.

Description

Technical Field

[0001] The present application relates to the technical field of tensile testing tools, and in particular to a clamp device for tensile testing of large-diameter and high-wall-thickness thermoplastic pipes. Background Art

[0002] Vigorously developing infrastructure construction is a necessary factor in promoting economic and social development in my country, and engineering plastic pipes play a very important role in it. Thermoplastic plastic pipes are one of the profiles widely used in engineering. Usually, tensile yield stress is regarded as an important indicator for testing the mechanical properties of plastic pipes. Yield stress mainly reflects the rigidity of the material and is related to the bond, organization, structure, atomic nature and added anti-filling and reinforcing modifiers. The accuracy of the test results of the tensile properties of pipes is affected by many factors. In addition to objective reasons such as the accuracy of the testing machine and extensometer itself, it is also affected by various factors such as the selection of the extensometer, the clamping position, the type of the testing machine fixture, and the measurement of the sample area. According to the relevant national standards, dumbbell-shaped splines are mainly used for testing pipe tensile specimens.

[0003] After searching, the Chinese patent with application number: 201621428163.0 discloses a dumbbell-shaped plastic spline tensile test clamping device, including a main board, a connecting plate, and a connecting rod. The main board is rectangular, and two sets of slide grooves are symmetrically arranged on the main board. A connecting bolt is provided in the middle of the main board, and the connecting bolt is connected to the connecting seat; the supporting plate is "U"-shaped, and circular holes are respectively provided at the two end heads of the supporting plate, and connecting rods are installed in the circular holes, and the two ends of the connecting rod are fastened by bolts.

[0004] With respect to the above-mentioned related technologies, the inventors believe that there are the following technical defects that need to be improved:

[0005] Due to the special characteristics of large-diameter and high-walled pipes, the clamping end of the specimen is too thick and not conducive to clamping. The current traditional tensile test fixture, when its clamping thickness exceeds 20mm, can easily cause the fixture to slip during the test, resulting in unstable experimental data, poor accuracy, low test efficiency, and very inconvenient use. Utility Model Content

[0006] The present application provides a fixture device for tensile testing of large-diameter and high-wall-thickness thermoplastic pipes to improve the following technical problems:

[0007] Due to the special characteristics of large-diameter and high-walled pipes, the clamping end of the specimen is too thick and not conducive to clamping. The current traditional tensile test fixture, when its clamping thickness exceeds 20mm, can easily cause the fixture to slip during the test, resulting in unstable experimental data, poor accuracy, low test efficiency, and very inconvenient use.

[0008] The present application provides a fixture device for tensile testing of large-caliber and high-wall-thickness thermoplastic pipes, which adopts the following technical solution:

[0009] A fixture device for tensile testing of large-diameter and high-wall-thickness thermoplastic pipes comprises a transverse plate, two vertical clamping plates and two arc-shaped clamping plates, wherein the two vertical clamping plates are respectively connected to opposite sides of the transverse plate, and the arc-shaped clamping plate is arranged at one end of the vertical clamping plate away from the transverse plate, and a pipe clamp with gradually decreasing width is formed between the two arc-shaped clamping plates, wherein the minimum width of the pipe clamp is 20 mm, and the maximum width of the pipe clamp is 50 mm, and a tensile connection portion is arranged on the side of the transverse plate away from the pipe clamp, and the tensile connection portion is used for being detachably assembled on a tensile testing machine.

[0010] In a feasible technical solution of the present application, the transverse plate, the two vertical clamping plates and the two arc-shaped clamping plates are welded from stainless steel plates.

[0011] In a feasible technical solution of the present application, the tensile strength of the stainless steel plate is ≥150 MPa.

[0012] In an achievable technical solution of the present application, the thickness of the stainless steel plate is between 2-8 mm.

[0013] In a feasible technical solution of the present application, the transverse plate, the two vertical clamping plates and the two arc-shaped clamping plates form a cube structure.

[0014] In an achievable technical solution of the present application, the curvature of the arc-shaped clamping plate is between 80-100 degrees, and the side length of the cube structure is 3-5 times the radius of the arc-shaped clamping plate.

[0015] In an achievable technical solution of the present application, the clamping surface of the arc-shaped clamping plate has a concave-convex structure and forms anti-slip lines.

[0016] In an achievable technical solution of the present application, the stretching connection portion includes a threaded rod and a square rod, the bottom thread of the threaded rod is assembled at the center position of the transverse plate, the square rod is arranged at the end of the threaded rod away from the transverse plate, and the square rod is provided with a plurality of spaced-apart pin holes in a square shape along its length.

[0017] In an achievable technical solution of the present application, a reinforcing threaded barrel is provided at the center position of the transverse plate, and the bottom of the threaded rod is also threadedly assembled on the reinforcing threaded barrel.

[0018] In summary, the present application includes at least one of the following beneficial technical effects:

[0019] It can just fit the dumbbell-shaped end structure of large-diameter, high-wall-thickness thermoplastic pipes, and it has a simple structure, is easy to install and disassemble, and is not prone to causing the fixture to slip during the test. The experimental data is more stable, the accuracy is high, the test efficiency is high, and it is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a structural schematic diagram of a fixture device for tensile testing of large-diameter and high-wall-thickness thermoplastic pipes according to an embodiment of the present application.

[0022] Description of reference numerals:

[0023] 1. Transverse plate; 11. Reinforcement threaded cylinder;

[0024] 2. Vertical splint;

[0025] 3. Arc-shaped splint; 31. Anti-slip texture;

[0026] 4. tensile connection; 41. threaded rod; 42. square rod; 421. pin hole;

[0027] 100. Pipe clamp. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0030] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] The following is combined with Figure 1 This application is described in further detail.

[0033] The present application embodiment discloses a fixture device for tensile testing of large-diameter and high-wall-thickness thermoplastic pipes. Figure 1 A clamp device for tensile testing of large-diameter and high-wall-thickness thermoplastic pipes comprises a transverse plate 1, two vertical clamps 2 and two arc clamps 3. The two vertical clamps 2 are respectively connected to the opposite sides of the transverse plate 1, and the arc clamp 3 is arranged at one end of the vertical clamp 2 away from the transverse plate 1. A pipe clamp 100 with a gradually decreasing width is formed between the two arc clamps 3. The minimum width of the pipe clamp 100 is 20 mm, and the maximum width of the pipe clamp 100 is 50 mm. A tensile connection part 4 is arranged on the side of the transverse plate 1 away from the pipe clamp 100, and the tensile connection part 4 is used for being detachably assembled on a tensile testing machine.

[0034] The beneficial technical effects of a fixture device for tensile testing of large-diameter and high-wall-thickness thermoplastic pipes according to an embodiment of the present application are as follows:

[0035] It can just fit the dumbbell-shaped end structure of large-diameter, high-wall-thickness thermoplastic pipes, and it has a simple structure, is easy to install and disassemble, and is not prone to causing the fixture to slip during the test. The experimental data is more stable, the accuracy is high, the test efficiency is high, and it is more convenient to use.

[0036] In order to improve the structural strength of the clamp device, the transverse plate 1, the two vertical clamps 2 and the two arc-shaped clamps 3 are welded from stainless steel plates, and the tensile strength of the stainless steel plates is ≥150Mpa, wherein the thickness of the stainless steel plates is between 2-8 mm (preferably the thickness of the stainless steel plates is 3 mm), and the transverse plate 1, the two vertical clamps 2 and the two arc-shaped clamps 3 form a cube structure.

[0037] In order to prevent the corners and edges of the clamp device of the present application from injuring people, a circular chamfer is provided on the outer side of the connection between the vertical clamp 2 and the arc clamp 3, and a 45-degree chamfer is provided on the inner and outer sides of the connection between the transverse plate 1 and the vertical clamp 2 to improve its safety in use.

[0038] In order to make the gap between the two arc-shaped clamping plates 3 better adapt to the dumbbell-shaped end structure of the large-diameter and high-walled thermoplastic pipe, the arc of the arc-shaped clamping plate 3 is between 80 and 100 degrees, and the side length of the cube structure is 3 to 5 times the radius of the arc-shaped clamping plate 3.

[0039] In order to prevent the dumbbell-shaped end structure of the large-diameter and high-wall-thickness thermoplastic pipe from slipping between the two arc-shaped clamping plates 3 , the clamping surface of the arc-shaped clamping plates 3 has a concave-convex structure and forms anti-slip lines 31 .

[0040] In order to facilitate the assembly of the tensile connection part 4 and to make it detachable from the tensile testing machine, the tensile connection part 4 includes a threaded rod 41 and a square rod 42. The bottom thread of the threaded rod 41 is assembled at the center position of the transverse plate 1, and the square rod 42 is arranged at the end of the threaded rod 41 away from the transverse plate 1. The square rod 42 is provided with a plurality of spaced pin holes 421 along its length.

[0041] In order to make the connection between the transverse plate 1 and the tensile connection part 4 more firmly, a reinforcing threaded barrel 11 is provided at the center of the transverse plate 1 , and the bottom of the threaded rod 41 is also threadedly assembled on the reinforcing threaded barrel 11 .

[0042] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the application should be included in the scope of protection of the present application.

Claims

1. A fixture device for tensile testing of large-diameter and high-wall-thickness thermoplastic pipes, characterized in that: The invention comprises a transverse plate (1), two vertical clamping plates (2) and two arc-shaped clamping plates (3), wherein the two vertical clamping plates (2) are respectively connected to opposite sides of the transverse plate (1), and the arc-shaped clamping plate (3) is arranged at one end of the vertical clamping plate (2) away from the transverse plate (1), and a pipe clamping opening (100) with a gradually decreasing width is formed between the two arc-shaped clamping plates (3), wherein the minimum width of the pipe clamping opening (100) is 20 mm, and the maximum width of the pipe clamping opening (100) is 50 mm. A tensile connection part (4) is arranged on one side of the transverse plate (1) away from the pipe clamping opening (100), and the tensile connection part (4) is used for being detachably assembled on a tensile testing machine.

2. A fixture device for tensile testing of large-diameter and high-wall-thickness thermoplastic pipes according to claim 1, characterized in that: The transverse plate (1), the two vertical clamping plates (2) and the two arc-shaped clamping plates (3) are formed by welding stainless steel plates.

3. A fixture device for tensile testing of large-diameter and high-wall-thickness thermoplastic pipes according to claim 2, characterized in that: The tensile strength of the stainless steel plate is ≥150MPa.

4. A fixture device for tensile testing of large-diameter and high-wall-thickness thermoplastic pipes according to claim 2, characterized in that: The thickness of the stainless steel plate is between 2 and 8 mm.

5. The fixture device for tensile testing of large-diameter and high-wall-thickness thermoplastic pipes according to claim 2, characterized in that: The transverse plate (1), the two vertical clamping plates (2) and the two arc-shaped clamping plates (3) form a cubic structure.

6. A fixture device for tensile testing of large-diameter and high-wall-thickness thermoplastic pipes according to claim 5, characterized in that: The curvature of the arc-shaped clamping plate (3) is between 80 and 100 degrees, and the side length of the cube structure is 3 to 5 times the radius of the arc-shaped clamping plate (3).

7. The fixture device for tensile testing of large-diameter and high-wall-thickness thermoplastic pipes according to claim 1 is characterized in that: The clamping surface of the arc-shaped clamping plate (3) has a concave-convex structure and forms anti-slip lines (31).

8. The fixture device for tensile testing of large-diameter and high-wall-thickness thermoplastic pipes according to claim 1 is characterized in that: The tensile connecting part (4) comprises a threaded rod (41) and a square rod (42), wherein the bottom thread of the threaded rod (41) is assembled at the center position of the transverse plate (1), and the square rod (42) is arranged at the end of the threaded rod (41) away from the transverse plate (1), and the square rod (42) is provided with a plurality of spaced-apart pin holes (421) in a square shape along its length.

9. A fixture device for tensile testing of large-diameter and high-wall-thickness thermoplastic pipes according to claim 8, characterized in that: A reinforcing threaded barrel (11) is arranged at the center of the transverse plate (1), and the bottom of the threaded rod (41) is also threadedly assembled on the reinforcing threaded barrel (11).

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