CN221707138U - Tensile testing machine with marking positioning clamping device - Google Patents

Abstract

The utility model provides a tensile testing machine with a marking line positioning clamping device, including a tensile testing machine body, a supporting sliding rod is provided on the tensile testing machine body, two supporting frames are slidably mounted on the supporting sliding rod, and a clamping device is provided on each supporting frame; the clamping device includes a fixed clamping plate, a locking screw, a movable clamping plate, a compression spring, a baffle and a guide column; the right end face of the fixed clamping plate is fitted and fixed with the left end face of the supporting frame, and the two locking screws are arranged perpendicular to the left end face of the fixed clamping plate; the movable clamping plate is located between the two locking screws, and two guide columns perpendicular to the movable clamping plate are arranged on its left end face, and a compression spring is provided on the guide column, and the baffle is fixed by a locking nut after being mounted on the two locking screws and the guide column. The utility model ensures that during the tensile test, the clamping will not loosen or fall off due to changes in the cross-sectional dimensions of the sample, so that the experimental data is accurate and reliable, and the success rate of the tensile test is improved.

Description

A tensile testing machine with a marking line positioning clamping device

Technical Field

The utility model belongs to the technical field of tensile testing machines, in particular to a tensile testing machine with a marking line positioning clamping device.

Background Art

When conducting a tensile test on a plastic pipe, in order to accurately measure the change in the distance between the markings of a standard specimen of the plastic pipe during the tensile process, a clamping device is usually fixed at the markings of the specimen, and the data change in the specimen length during the tensile process is recorded by an instrument connected to the clamping device. During the tensile test, the cross-sectional area of the specimen will continue to decrease until it breaks, and the cross-sectional area of the specimen in contact with the clamping device will decrease accordingly, causing the clamping device and the specimen to loosen and fall off, so that the measurement data cannot truly reflect the actual change in the distance between the markings of the specimen tensile test, resulting in errors in the measurement results and failure of the tensile test. Therefore, during the test, whether the clamping device can be continuously and firmly clamped at the marking position is a key factor affecting the accuracy of measuring the distance between the markings of the tensile specimen.

Chinese patent CN 213275104 U discloses a tensile testing machine for automobile interior materials that is easy to clamp. The patent is to set an extendable rod connected to one end of two support rods, and the hydraulic rod drives two clamping plates to clamp at the same time, so as to achieve stable clamping of the sample when testing the automobile interior materials. However, the testing machine is not suitable for clamping and positioning the marking position of the tubular standard sample.

In summary, developing a tensile testing machine with a marking line positioning clamping device that will not cause the clamping to loosen or fall off due to changes in the cross-sectional dimensions of the clamping position of the plastic pipe sample, and ensuring that the tensile test data is accurate and reliable, has become a topic faced by relevant technical personnel.

Utility Model Content

The utility model aims to provide a tensile testing machine with a marking line positioning clamping device, which can prevent the clamping from loosening or falling off due to changes in the cross-sectional dimensions of the sample during the plastic pipe tensile test, thereby ensuring that the experimental data of the marking line tensile length is reliable.

The purpose of the utility model is to solve the following technical solutions:

A tensile testing machine with a marking line positioning clamping device comprises a tensile testing machine body, a supporting sliding rod is provided on the tensile testing machine body, two supporting frames are slidably mounted on the supporting sliding rod, and a clamping device is provided on each supporting frame; the clamping device comprises a fixed clamping plate, a locking screw, a movable clamping plate, a compression spring, a baffle and a guide column; the right end face of the fixed clamping plate is fitted and fixed to the left end face of the supporting frame, and the two locking screws are arranged perpendicular to the left end face of the fixed clamping plate; the movable clamping plate is located between the two locking screws, and two guide columns perpendicular to the left end face are arranged on the left end face of the movable clamping plate, and a compression spring is provided on the guide column, and the baffle is fixed by a locking nut after being mounted on the two locking screws and the guide column.

The above-mentioned tensile testing machine with a marking line positioning clamping device, the left end face of the fixed clamping plate is a middle raised plane, and the middle part of the raised plane has a V-shaped groove; the movable clamping plate has a rectangular shape, and a V-shaped groove of the same size is provided on the surface facing the fixed clamping plate; the symmetry axes of the two V-shaped grooves coincide.

In the above-mentioned tensile testing machine with a marking line positioning clamping device, the guide column and the hole on the baffle are in sliding fit.

In the above-mentioned tensile testing machine with a marking line positioning clamping device, the length of the guide column exposed from the baffle is greater than 10 mm when the compression spring is in a non-compressed state.

The above-mentioned tensile testing machine with a marking line positioning clamping device also includes a pad, which is a rectangular parallelepiped structure, and its length and width are consistent with the length and width of the movable clamp, and two pads are provided.

In the above-mentioned tensile testing machine with a marking line positioning clamping device, a guide hole is provided on the support frame, and a sliding fit is formed between the guide hole and the auxiliary component supporting sliding rod.

In the above-mentioned tensile testing machine with a marking line positioning clamping device, the axis centers of the two guide columns and the two locking screws are located on the same horizontal plane.

Beneficial Effects

The utility model utilizes a compression spring to connect a movable clamping plate. During a tensile test, when the cross-sectional size of the sample becomes smaller, the movable clamping plate moves and clamps the sample under the action of the spring elastic force, ensuring that there will be no loosening or falling off between the clamping device and the sample, making the experimental data accurate and reliable, and improving the success rate of the tensile test.

BRIEF DESCRIPTION OF THE DRAWINGS

The utility model is further described in detail below in conjunction with the accompanying drawings.

Fig. 1 is a schematic diagram of the structure of the utility model;

FIG2 is a schematic diagram of the structure of the clamping device of the utility model clamping a round tube;

FIG3 is a top view of FIG2;

Fig. 4 is a diagram of the pad appearance;

FIG. 5 is a schematic structural diagram of the practical clamping device for clamping a square tube.

The numbers in the figure are respectively as follows: 1. tensile testing machine, 2. specimen, 3. supporting sliding rod, 4. lower clamp, 5. upper clamp, 6. lifting beam of testing machine, 7. data cable, 8. sensor, 9. lower marking line, 10. supporting frame, 11. fixed splint, 12. movable splint, 13. locking screw, 14. locking nut, 15. guide column, 16. compression spring, 17. baffle, 18. pad, 19. guide hole, 20. nut, 21. upper marking line.

DETAILED DESCRIPTION

The utility model provides a tensile testing machine with a marking line positioning clamping device. By adjusting the locking nut, the compression spring between the pressure plate and the movable clamping plate is compressed. When the cross-sectional area of the sample changes during the stretching process, the elastic force of the compression spring is released to push the movable clamping plate to move toward the sample, so that the clamping device continues to clamp the sample; loosening and falling off between the clamping device and the sample during the tensile test are avoided. The V-shaped groove design of the clamping surface is suitable for round tube samples of various specifications. The addition of an auxiliary pad can stretch square tube samples, thereby improving the versatility of the clamping device. The tensile testing machine and the instrument for reading are not fully drawn in the attached figure.

Referring to Figures 1 and 2, a tensile testing machine with a marking line positioning clamping device includes a tensile testing machine body, which is characterized in that a supporting sliding rod 3 is provided on the tensile testing machine body, and two supporting frames 10 are slidably mounted on the supporting sliding rod 3, and each supporting frame 10 is provided with a clamping device; the clamping device includes a fixed clamping plate 11, a locking screw 13, a movable clamping plate 12, a compression spring 16, a baffle 17 and a guide column 15; the right end face of the fixed clamping plate 11 is fitted and fixed to the left end face of the supporting frame 10, and the two locking screws 13 are arranged perpendicular to the left end face of the fixed clamping plate 11; the movable clamping plate 12 is located between the two locking screws 13, and two guide columns 15 perpendicular to them are arranged on its left end face, and a compression spring 16 is provided on the guide column 15, and the baffle 17 is fixed by a locking nut 14 after being mounted on the two locking screws 13 and the guide column 15. During the test, first fix the sample on the tensile testing machine with a clamp, adjust the upper support frame and the adjusting clamping device on the supporting sliding rod, clamp and fix the upper marking line of the sample with the clamping device, then adjust the upper and lower support frames and the adjusting clamping device on the supporting sliding rod, clamp and fix the lower marking line of the sample with the clamping device, and set a data line of an external instrument for reading. When the cross-sectional area of the sample changes during the stretching process, the elastic force of the compression spring is released to cause the movable clamp to move and continuously clamp the sample. The distance between the two support frames and the clamping device increases as the distance between the sample marking lines increases. The sensor on the support frame transmits the test data to the external instrument through the data line.

Referring to FIG1 , the left end face of the fixed clamping plate 11 is a middle raised plane, and the middle part of the raised plane has a V-shaped groove; the movable clamping plate 12 is a rectangular parallelepiped, and a V-shaped groove of the same size is provided on the surface facing the fixed clamping plate 11; the symmetry axes of the two V-shaped grooves coincide. The clamping surface V-shaped groove design is suitable for round tube specimens of various specifications.

Referring to Fig. 1, the guide post 15 is slidably matched with the hole on the baffle 17. The baffle is locked with a locking nut, and the slidably matched baffle is convenient for moving along the guide post.

1, the length of the guide column 15 exposed from the baffle 17 is greater than 10 mm when the compression spring 16 is in the non-compressed state. The baffle has a large displacement range, which is convenient for disassembly and assembly of the sample.

3, it also includes a backing plate 18, which is a rectangular parallelepiped structure, and its length and width are consistent with the length and width of the movable clamping plate 12, and two are provided. The backing plate is suitable for square tube samples with small cross-sections and has high versatility.

1 and 5, the support frame 10 is provided with a guide hole 19, and the guide hole 19 is in sliding fit with the auxiliary support sliding rod 3. During the tensile test, the support frame with the clamping device moves up and down along the support sliding rod.

1 , the axis lines of the two guide posts 15 and the two locking screws 13 are located on the same horizontal plane. The clamping device is balanced and stable during use.

Claims (7)

1. A tensile testing machine with a marking line positioning clamping device, comprising a tensile testing machine body, characterized in that a supporting sliding rod (3) is provided on the tensile testing machine body, two supporting frames (10) are slidably mounted on the supporting sliding rod (3), and each supporting frame (10) is provided with a clamping device; the clamping device comprises a fixed clamping plate (11), a locking screw (13), a movable clamping plate (12), a compression spring (16), a baffle (17) and a guide column (15); the fixed The right end face of the clamping plate (11) is fitted and fixed to the left end face of the support frame (10), and two locking screws (13) are arranged perpendicular to the left end face of the fixed clamping plate (11); the movable clamping plate (12) is located between the two locking screws (13), and two guide columns (15) perpendicular to the left end face are arranged on the left end face of the movable clamping plate (12), and the guide columns (15) are provided with compression springs (16); the baffle (17) is fixed by a locking nut (14) after being fitted with the two locking screws (13) and the guide columns (15). 2. A tensile testing machine with a marking positioning clamping device according to claim 1, characterized in that the left end face of the fixed clamping plate (11) is a middle raised plane, and the middle part of the raised plane has a V-shaped groove; the movable clamping plate (12) is a rectangular parallelepiped, and a V-shaped groove of the same size is provided on the surface facing the fixed clamping plate (11); the symmetry axes of the two V-shaped grooves coincide. 3. A tensile testing machine with a marking line positioning clamping device according to claim 2, characterized in that the guide column (15) and the hole on the baffle (17) are in sliding fit. 4. A tensile testing machine with a marking line positioning clamping device according to claim 3, characterized in that the length of the guide column (15) exposed from the baffle (17) when the compression spring (16) is in a non-compressed state is greater than 10 mm. 5. A tensile testing machine with a marking line positioning clamping device according to claim 4, characterized in that it also includes a pad (18), wherein the pad (18) is a rectangular structure, and its length and width are consistent with the length and width of the movable clamp (12), and two pads are provided. 6. A tensile testing machine with a marking line positioning clamping device according to claim 5, characterized in that a guide hole (19) is provided on the support frame (10), and the guide hole (19) and the auxiliary component supporting sliding rod (3) are in sliding fit. 7. A tensile testing machine with a marking line positioning clamping device according to claim 6, characterized in that the axis lines of the two guide columns (15) and the two locking screws (13) are located on the same horizontal plane.