A round tube stretching clamp

Abstract

The utility model relates to pipeline tensile test method technical field, and disclose a kind of round pipe tensile fixture, including fixed support rod, the outside rotation of fixed support rod is connected with rotary handle, the outside sliding connection of fixed support rod has fixed support rod, the top fixed connection of fixed support rod has loading mechanism fixed slot, the top sliding connection of fixed support rod has big wedge and small wedge, the inside sliding connection of fixed support rod top has big wedge, the utility model has remarkable advantage, one is simulation real force precision test, through big, small wedge cooperation, can accurately reflect the stress strain in round pipe actual engineering, obtain accurate mechanical property data, two are simple and easy to operate efficient, utilize rotary handle and side handle, adjust fixed support rod position to easily realize round pipe clamping loosening, save test time, three are clamped stable and reliable, wedge automatic gap filling, prevent round pipe skewing sliding.

Description

Technical Field

[0001] This utility model relates to the technical field of pipe tensile testing methods, specifically a circular pipe tensile clamp. Background Technology

[0002] Tensile testing is a materials testing method used to evaluate the mechanical properties of materials under tensile force. It is one of the most basic and commonly used materials testing methods, providing detailed information about a material's strength, ductility, and other key mechanical properties. Tensile test specimens for pipe materials are generally elongated strips with parallel clamping ends to ensure uniform stress during tension and avoid uneven strain distribution. These specimens typically require cutting, shearing, or laser cutting to obtain the required dimensions.

[0003] During installation, the specimen is placed between the clamps, ensuring that the two ends of the specimen are in flat contact with the clamping surfaces of the clamps to avoid skewing or uneven stress on the specimen. During the test, the tensile testing equipment records and displays the strain and stress data. When the test reaches the set endpoint, the testing machine stops loading and displays the final test data. Based on the test data, subsequent mechanical property analysis is performed. This analysis may include determining parameters such as the material's yield strength, tensile strength, and elongation at break, as well as plotting stress-strain curves. However, for strip materials, this does not accurately reflect the mechanical properties of the pipeline under actual working conditions. For pipes or circular pipe materials, circular pipe specimens can better simulate the stress conditions in actual use, such as the internal pressure of the pipe and the external environmental forces, and better reflect its stress-strain response in actual engineering, thus having higher application reliability. Therefore, we propose a circular pipe tensile clamp. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a round tube stretching clamp, which solves the aforementioned problems.

[0006] (II) Technical Solution

[0007] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0008] A circular tube stretching clamp includes a first fixed support rod, a rotating handle rotatably connected to the outer side of the first fixed support rod, a second fixed support rod slidably connected to the outer side of the first fixed support rod, a loading mechanism fixing groove fixedly connected to the top of the first fixed support rod, a large wedge and a small wedge slidably connected to the top of the first fixed support rod, and a large wedge slidably connected to the inner side of the top of the second fixed support rod.

[0009] Preferably, the bottom of the fixed support rod is provided with a pin hole, the bottom of the fixed support rod is provided with a limiting position groove, the top surface of the fixed support rod is fixedly connected with a loading mechanism fixing groove, and an outer fixing groove is provided on the outer side of the loading mechanism fixing groove.

[0010] Preferably, the top inner side of the rotary handle is provided with a connecting threaded hole, and the outer side of the rotary handle is fixedly connected with equidistantly distributed side handles.

[0011] Preferably, the bottom outer side of the fixed support rod two is provided with a connecting external thread, the top of the fixed support rod two is fixedly connected with a sliding groove peripheral boss, and the inner side of the sliding groove peripheral boss is provided with an internal sliding groove.

[0012] Preferably, the side cross-section of the large wedge is a large wedge-shaped trapezoidal cross-section, the side cross-section of the small wedge is a small wedge-shaped trapezoidal cross-section, and the large wedge and the small wedge are an open annulus as a whole.

[0013] Preferably, the inner side of the threaded hole at the top of the rotary handle is threaded with an external thread; the inner side of the loading mechanism fixing groove is slidably connected with a small wedge-shaped trapezoidal section; the loading mechanism fixing groove and the small wedge-shaped trapezoidal section are tightly fitted together; the inner side of the internal sliding groove is slidably connected with a large wedge-shaped body; the inner side of the outer boss of the sliding groove is tightly fitted with the outer side of the large wedge-shaped body; and the top surface of the fixed support rod is slidably connected with a large wedge-shaped body and a small wedge-shaped body.

[0014] (III) Beneficial Effects

[0015] Compared with the prior art, the advantages of this utility model are:

[0016] A circular tube stretching fixture is provided, which has the following advantages:

[0017] 1. Simulates real stress for more accurate testing: Adopting a structural design adapted to round tubes, using large and small wedges to clamp the round tubes, this design can better simulate the pressure and external forces experienced by the round tubes in actual work during testing. Compared with traditional tensile clamps for strip materials, it can more accurately reflect the stress-strain response of round tube materials in actual engineering, thereby obtaining more accurate mechanical property data, such as yield strength, tensile strength, and elongation at break, improving the reliability and application value of test results.

[0018] 2. Simple and efficient operation: The rotating handle and related connecting structures are set up. The side handle on the outside of the rotating handle makes it easy for the operator to apply force to rotate. The connecting thread hole at the top of the rotating handle and the connecting external thread at the bottom of the fixed support rod can easily adjust the up and down position of the fixed support rod. This design makes the clamping and loosening of the round tube simple and quick. When conducting multiple tests, it can effectively save operation time, improve testing efficiency, and reduce labor costs.

[0019] 3. Secure and reliable clamping: The large and small wedges fit tightly with the outer boss of the sliding groove and the fixing groove of the loading mechanism, respectively. When the fixed support rod moves up and down, it can automatically fill the gap between the round tube and the corresponding component. When stretched downward, the large wedge fills the gap between the pipe and the outer boss of the sliding groove, and the small wedge fills the gap between the pipe and the fixing groove of the loading mechanism when moving relative to each other. This ensures that the round tube is securely clamped during the tensile test, avoiding skewing or slippage, ensuring the stability of the test process, and making the test data more accurate and reliable. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram showing the overall structure of this utility model disassembled;

[0022] Figure 3 This is a cross-sectional view of the overall structure of this utility model;

[0023] Figure 4 This is a sectional view of the overall structure of this utility model.

[0024] In the diagram: 1. Fixed support rod one; 2. Pin hole; 3. Rotary handle; 4. Side handle; 5. Fixed support rod two; 6. Outer boss of sliding groove; 7. Large wedge; 8. Small wedge; 9. Loading mechanism fixing groove; 10. Outer fixing groove; 11. Limiting point groove; 12. Connecting threaded hole; 13. Connecting external thread; 14. Internal sliding groove; 15. Small wedge trapezoidal section; 16. Large wedge trapezoidal section. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-4This utility model provides a technical solution:

[0027] A circular tube stretching clamp includes a fixed support rod 1, a rotating handle 3 rotatably connected to the outer side of the fixed support rod 1, a fixed support rod 2 slidably connected to the outer side of the fixed support rod 1, a loading mechanism fixing groove 9 fixedly connected to the top of the fixed support rod 1, a large wedge 7 and a small wedge 8 slidably connected to the top of the fixed support rod 1, and a large wedge 7 slidably connected to the inner side of the top of the fixed support rod 2 5.

[0028] Furthermore, a pin hole 2 is provided at the bottom of the fixed support rod 1, a limiting position groove 11 is provided at the bottom of the fixed support rod 1, a loading mechanism fixing groove 9 is fixedly connected to the top surface of the fixed support rod 1, and an outer fixing groove 10 is provided on the outside of the loading mechanism fixing groove 9. Through the action of the pin hole 2, the mutual connection between the fixture and the tensile testing machine is realized.

[0029] Furthermore, a connecting threaded hole 12 is provided on the inner side of the top of the rotary handle 3, and side handles 4 are fixedly connected to the outer side of the rotary handle 3 at equal intervals. The rotation of the rotary handle 3 is achieved through the action of the side handles 4.

[0030] Furthermore, the bottom outer side of the fixed support rod 2 5 is provided with an external thread 13, and the top of the fixed support rod 2 5 is fixedly connected with a sliding groove peripheral boss 6. The inner side of the sliding groove peripheral boss 6 is provided with an internal sliding groove 14. Through the function of the bottom connecting external thread 13 of the fixed support rod 2 5, the threaded connection between the fixed support rod 2 5 and the rotating handle 3 is realized.

[0031] Furthermore, the side cross-section of the large wedge 7 is a large wedge trapezoidal cross-section 16, and the side cross-section of the small wedge 8 is a small wedge trapezoidal cross-section 15. The large wedge 7 and the small wedge 8 together form an open ring.

[0032] Furthermore, the inner side of the threaded hole 12 at the top of the rotating handle 3 is threaded with an external thread 13, the inner side of the loading mechanism fixing groove 9 is slidably connected with a small wedge-shaped trapezoidal section 15, the loading mechanism fixing groove 9 and the small wedge-shaped trapezoidal section 15 are tightly fitted together, the inner side of the inner sliding groove 14 is slidably connected with a large wedge-shaped body 7, the inner side of the outer boss 6 of the sliding groove is tightly fitted with the outer side of the large wedge-shaped body 7, and the top surface of the fixed support rod 1 is slidably connected with a large wedge-shaped body 7 and a small wedge-shaped body 8. Through the interaction of each component, the round tube is clamped and fixed.

[0033] Structural Description:

[0034] Fixed support rod 1: As the basic support structure of the fixture, it has a pin hole 2 and a limiting slot 11 at its bottom. The pin hole 2 is used to connect with the tensile testing machine so that the fixture can be stably installed on the testing machine. The limiting slot 11 can accurately position the installation position of the fixture to ensure that the fixture will not be displaced during the test. The top surface of the fixed support rod 1 is fixedly connected to the loading mechanism fixing slot 9, providing an installation position for the loading mechanism. At the same time, its top is also the sliding track of the large wedge 7 and the small wedge 8, ensuring that the wedges can slide smoothly to achieve the clamping operation of the round tube.

[0035] Rotary handle 3: The outer side is rotatably connected to the fixed support rod 1, which is convenient for the operator to operate. The inner side of its top is provided with a connecting threaded hole 12. It is connected to the connecting external thread 13 at the bottom of the fixed support rod 5 to adjust the position of the fixed support rod 5. The outer side of the rotary handle 3 is also fixedly connected with equidistant side handles 4. The operator can apply force by holding the side handles 4 to rotate the rotary handle 3 more easily, which improves the convenience of operation.

[0036] Fixed support rod 2 5: The external thread 13 on the bottom outer side mates with the threaded hole 12 on the top of the rotating handle 3. When the rotating handle 3 is rotated, the fixed support rod 2 5 can slide up and down along the fixed support rod 1 1. Its top is fixedly connected to the outer boss 6 of the sliding groove. An inner sliding groove 14 is opened on the inner side of the outer boss 6 of the sliding groove. The inner sliding groove 14 is used to install the large wedge 7, so that the large wedge 7 can slide in it. At the same time, the outer boss 6 of the sliding groove mates with the loading mechanism fixing groove 9, which plays a key role in fixing the round tube.

[0037] Loading mechanism fixing groove 9: Fixed to the top surface of the fixed support rod 1, with a small wedge 8 slidingly connected to its inner side. The side cross section of the small wedge is a small wedge trapezoidal cross section 15, and it fits tightly with the small wedge 8. An outer fixing groove 10 is provided on the outer side of the loading mechanism fixing groove 9, which can be used to connect other auxiliary devices or to further fix the loading mechanism. When fixing the round pipe, the loading mechanism fixing groove 9 and the outer boss 6 of the sliding groove cooperate with each other. The small wedge 8 fills the gap between the pipe and the loading mechanism fixing groove 9, thereby clamping the round pipe.

[0038] Large wedge 7 and small wedge 8: The side cross-section of large wedge 7 is a large wedge-shaped trapezoidal section 16, and the side cross-section of small wedge 8 is a small wedge-shaped trapezoidal section 15. Both are open annular rings. Large wedge 7 slides in the internal sliding groove 14 and the top of the fixed support rod 1. When fixing the circular tube, during the downward stretching process, large wedge 7 fills the gap between the pipe and the outer boss 6 of the sliding groove. Small wedge 8 slides in the loading mechanism fixing groove 9. When the fixed support rod 5 moves relative to the loading mechanism fixing groove 9, small wedge 8 fills the gap between the pipe and the loading mechanism fixing groove 9. The two work together to ensure that the circular tube is firmly clamped.

[0039] Working principle: When this utility model is needed, the pipe is placed between the outer boss 6 of the sliding groove and the fixed groove 9 of the loading mechanism. When the handle 3 is rotated to adjust the fixed support rod 5 to move up and down, the outer boss 6 of the sliding groove at the top of the fixed support rod 5 and the fixed groove 9 of the loading mechanism will be relatively displaced. During the relative movement, the gap between the pipe and the fixed groove 9 of the loading mechanism is filled by the small wedge 8. When it is pulled down, the gap between the pipe and the outer boss 6 of the sliding groove is filled by the large wedge 7, thereby achieving the function of fixing the round pipe.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A round tube stretching clamp comprising a fixed support rod one (1), characterized in that: A rotating handle (3) is rotatably connected to the outer side of the first fixed support rod (1), and a second fixed support rod (5) is slidably connected to the outer side of the first fixed support rod (1). A loading mechanism fixing groove (9) is fixedly connected to the top of the first fixed support rod (1). A large wedge (7) and a small wedge (8) are slidably connected to the top of the first fixed support rod (1), and a large wedge (7) is slidably connected to the inner side of the top of the second fixed support rod (5).

2. A round tube stretch clamp according to claim 1, characterized in that: The bottom of the fixed support rod (1) is provided with a pin hole (2), the bottom of the fixed support rod (1) is provided with a limited position groove (11), the top surface of the fixed support rod (1) is fixedly connected with a loading mechanism fixing groove (9), and the outer side of the loading mechanism fixing groove (9) is provided with an outer fixing groove (10).

3. A circular tube stretching fixture according to claim 2, characterized in that: The rotating handle (3) has a connecting threaded hole (12) on the inner side of its top, and the rotating handle (3) has side handles (4) that are evenly distributed on its outer side.

4. A circular tube stretching fixture according to claim 3, characterized in that: The bottom outer side of the fixed support rod 2 (5) is provided with a connecting external thread (13), the top of the fixed support rod 2 (5) is fixedly connected with a sliding groove peripheral boss (6), and the inner side of the sliding groove peripheral boss (6) is provided with an internal sliding groove (14).

5. A circular tube stretching fixture according to claim 1, characterized in that: The side cross section of the large wedge (7) is a large wedge trapezoidal cross section (16), and the side cross section of the small wedge (8) is a small wedge trapezoidal cross section (15). The large wedge (7) and the small wedge (8) are an open ring as a whole.

6. A circular tube stretching fixture according to claim 4, characterized in that: The top of the rotating handle (3) is connected to the inner side of the threaded hole (12) with the connecting external thread (13). The inner side of the loading mechanism fixing groove (9) is slidably connected to the small wedge-shaped trapezoidal section (15). The loading mechanism fixing groove (9) and the small wedge-shaped trapezoidal section (15) are closely fitted together. The inner side of the inner sliding groove (14) is slidably connected to the large wedge-shaped body (7). The inner side of the outer boss (6) of the sliding groove is closely fitted to the outer side of the large wedge-shaped body (7). The top surface of the fixed support rod (1) is slidably connected to the large wedge-shaped body (7) and the small wedge-shaped body (8).

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