Test fixture of tension tester

Abstract

The utility model relates to the technical field of tension testing machines, in particular to a test fixture of a tension testing machine. A test fixture of a tensile testing machine comprises a fixed base and a pair of clamping blocks installed on the fixed base, a trapezoidal groove penetrating to the outer wall is formed in the fixed base, the clamping blocks are installed in the trapezoidal groove, the heads of the clamping blocks protrude out of the top edge of the trapezoidal groove, a push block is arranged in the trapezoidal groove, sliding rods are fixed to the two sides of the push block respectively, and the sliding rods are arranged in the trapezoidal groove. The tails of the two clamping blocks are arranged on the sliding rod in a sleeving mode and are in sliding fit with the sliding rod, the outer sides of the clamping blocks are provided with inclined faces matched with and in sliding fit with the side wall of the bevel edge of the trapezoidal groove, a pull rod is fixed to the tail of the push block, the push block is connected with a shifting mechanism through the pull rod, and a longitudinal spring is connected between the push block and the side wall of the bottom edge of the trapezoidal groove. And pressing blocks for pressing the clamping blocks are respectively arranged on two sides of the trapezoidal groove on the top surface of the fixed base. The test fixture of the tension tester is light in weight, and the test precision and sensitivity are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tension testing machines, in particular to a testing fixture for a tension testing machine. Background Art

[0002] Tensile testing machines, also known as universal material testing machines, are mainly used for tensile testing of materials or products. Existing tensile testing machines such as Chinese utility model patent CN202123097224.3 (announcement date: 2022.05.27) generally include a machine base, a gantry and a movable base, wherein the gantry is fixed to the upper end of the machine base, and the movable base is slidably connected to the inner side of the gantry. A tensile sensor is fixedly mounted at the lower end of the movable base, and the lower end of the tensile sensor and the middle part of the upper end of the machine base are equipped with clamping devices. These clamping devices include a clamping seat, a side seat and a pre-clamping plate, which work together to clamp the test material.

[0003] Although this design can effectively clamp the material through the combination of knobs, active gears, driven gear rings, threaded sleeves and threaded rods, it still has some obvious defects. In particular, the clamping force is adjusted by the threaded rod, which reduces the adjustment efficiency. At present, there are electrical structures such as cylinders on the market that realize the automatic opening and closing of the clamp to complete the clamping of the test material, but most of them have complex structures and heavy weight. When testing, their inertia can easily affect the test accuracy and sensitivity. Utility Model Content

[0004] The utility model aims to overcome the above-mentioned shortcomings and provide a technical solution that can solve the above-mentioned problems.

[0005] A test fixture for a tensile testing machine comprises a fixed base and a pair of clamping blocks installed on the fixed base, the fixed base is provided with a trapezoidal groove penetrating to the outer wall, the clamping block is installed in the trapezoidal groove and the head of the clamping block protrudes from the top edge of the trapezoidal groove, a push block is provided in the trapezoidal groove, sliding rods are respectively fixed on both sides of the push block, the tails of the two clamping blocks are respectively sleeved on the sliding rods and slidably matched with the sliding rods, the outer side of the clamping block is provided with an inclined surface adapted to and slidably matched with the hypotenuse side wall of the trapezoidal groove, a pull rod is fixed to the tail of the push block and is connected to a toggle mechanism through the pull rod, a longitudinal spring is connected between the push block and the bottom side wall of the trapezoidal groove, and a pressing block for pressing the clamping block is respectively provided on both sides of the trapezoidal groove on the top surface of the fixed base.

[0006] Furthermore, the toggle mechanism includes a rack fixedly connected to the pull rod, a fan-shaped gear meshing with the rack, and a toggle rod fixedly connected to the fan-shaped gear. The fixed base is provided with a sliding hole connected to the bottom edge of the trapezoidal groove. The rack is arranged in the sliding hole and slides with it. The fixed base is provided with a mounting groove. A support shaft is provided at the axis center of the fan-shaped gear and is rotatably installed on the mounting groove through the support shaft.

[0007] Optionally, a transverse spring sleeved on the slide rod is respectively provided between the inner sides of the tails of the two clamping blocks and the push block.

[0008] Optionally, a guide bar is provided on the top of the clamping block and the guide of the guide bar is parallel to the oblique side wall of the trapezoidal groove, and a sliding groove matching the shape of the guide bar is provided on the pressing block and slidingly cooperates with the guide bar through the sliding groove.

[0009] Furthermore, positioning grooves are respectively provided at the notches on both sides of the trapezoidal groove, and the pressing block is fixedly installed in the positioning grooves.

[0010] Furthermore, a tooth-shaped anti-slip portion is provided on the inner side of the head of the clamping block.

[0011] Compared with the prior art, the beneficial effects achieved by the utility model are as follows: the test fixture of the tensile testing machine of the utility model adopts mechanical transmission and spring mechanics structure, has a compact structure and simple operation, is conducive to achieving lightweight of the test fixture of the tensile testing machine, reduces the inherent load of the driving mechanism of the tensile testing machine, and improves the accuracy and sensitivity of the test.

[0012] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 It is a schematic diagram of the exploded structure of the utility model.

[0016] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0017] Figure 4 It is a structural schematic diagram of the toggle mechanism in the utility model.

[0018] In the figure: fixed base 1, clamping block 2, trapezoidal groove 3, push block 4, slide rod 5, pull rod 6, toggle mechanism 7, longitudinal spring 8, pressure block 9, rack 10, sector gear 11, toggle rod 12, slide hole 13, mounting groove 14, support shaft 15, transverse spring 16, guide bar 17, positioning groove 18, toothed anti-slip portion 19. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figures 1 to 4 A test fixture for a tensile testing machine includes a fixed base 1, a pair of clamping blocks 2 installed on the fixed base 1, a trapezoidal groove 3 penetrating to the outer wall is provided on the fixed base 1, the clamping block 2 is installed in the trapezoidal groove 3 and the head of the clamping block 2 protrudes from the top edge of the trapezoidal groove 3, a push block 4 is provided in the trapezoidal groove 3, and sliding rods 5 are respectively fixed on both sides of the push block 4, the tails of the two clamping blocks 2 are respectively sleeved on the sliding rods 5 and slidably matched therewith, an inclined surface adapted to and slidably matched with the hypotenuse side wall of the trapezoidal groove 3 is provided on the outer side of the clamping block 2, a pull rod 6 is fixed to the tail of the push block 4 and a toggle mechanism 7 is connected through the pull rod 6, a longitudinal spring 8 is connected between the push block 4 and the bottom side wall of the trapezoidal groove 3, and a pressing block 9 for pressing the clamping block 2 is respectively provided on both sides of the trapezoidal groove 3 on the top surface of the fixed base 1. Specifically, as Figures 1 to 3 As shown, the trapezoidal groove 3 is preferably an isosceles trapezoidal structure, and the push block 4 can be moved backward by the toggle mechanism 7, and the longitudinal spring 8 is compressed to store energy, and the two clamping blocks 2 are also moved backward with the push block 4 so that the two clamping blocks 2 can be separated from each other. After the test sample is placed between the heads of the two clamping blocks 2, the toggle mechanism 7 is released, and the push block 4 is reset under the elastic force of the longitudinal spring 8 and drives the two clamping blocks 2 to squeeze the hypotenuse side wall of the trapezoidal groove 3, and the two clamping blocks 2 are guided by the hypotenuse side wall of the trapezoidal groove 3 to the middle until the test sample is clamped. The test fixture of the tensile testing machine of the utility model adopts mechanical transmission and spring mechanics structure, has a compact structure and simple operation, is conducive to realizing the lightweight of the test fixture of the tensile testing machine, reducing the inherent load of the driving mechanism of the tensile testing machine, and improving the accuracy and sensitivity of the test.

[0021] Further, such as Figure 4As shown, the toggle mechanism 7 includes a rack 10 fixedly connected to the pull rod 6, a sector gear 11 meshing with the rack 10, and a toggle lever 12 fixedly connected to the sector gear 11. The fixed base 1 is provided with a sliding hole 13 connected to the bottom edge of the trapezoidal groove 3. The rack 10 is arranged in the sliding hole 13 and slides with it. The fixed base 1 is provided with a mounting groove 14. The axis of the sector gear 11 is provided with a support shaft 15 and is rotatably mounted on the mounting groove 14 through the support shaft 15. The toggle mechanism 7 forms a compact and efficient transmission system through the combination of the rack 10, the sector gear 11 and the toggle lever 12. This system allows the tester to remotely control the movement of the rack 10 by operating the toggle lever 12, thereby controlling the movement of the push block 4 and the clamp block 2, converting the linear motion into the rotational motion, and ensuring the accuracy and reliability of the transmission system through sliding fit and stable support. This design makes the operation of the clamp more convenient, accurate and efficient, and provides a reliable guarantee for the tensile test.

[0022] Optionally, transverse springs 16 sleeved on the slide bar 5 are respectively provided between the inner sides of the tails of the two clamping blocks 2 and the push block 4. When the toggle mechanism 7 drives the push block 4 to move backward, the transverse spring 16 can push the two clamping blocks 2 outward to separate the two clamping blocks 2 from each other, and cooperate with the longitudinal spring 8 and the trapezoidal groove 3 and other structures to conveniently realize the automatic opening and closing between the two clamping blocks 2.

[0023] Optionally, a guide bar 17 is provided on the top of the clamping block 2 and the guide of the guide bar 17 is parallel to the oblique side wall of the trapezoidal groove 3, and a slide groove matching the shape of the guide bar 17 is provided on the pressing block 9 and slides with the guide bar 17 through the slide groove. During the movement of the clamping block 2, due to the oblique guide structure of the guide bar 17, the automatic opening and closing between the two clamping blocks 2 can be conveniently realized in combination with the toggle structure, the push block 4, the slide rod 5 and other structures.

[0024] Furthermore, positioning grooves 18 are respectively provided at the notches on both sides of the trapezoidal groove 3 , and the pressing block 9 is fixedly installed in the positioning grooves 18 .

[0025] Furthermore, a tooth-shaped anti-slip portion 19 is provided on the inner side of the head of the clamping block 2 .

[0026] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A test fixture for a tensile testing machine, comprising a fixed base, a pair of clamping blocks mounted on the fixed base, characterized in that: A trapezoidal groove that passes through the outer wall is provided on the fixed base, the clamping block is installed in the trapezoidal groove and the head of the clamping block protrudes from the top edge of the trapezoidal groove, a push block is provided in the trapezoidal groove, and sliding rods are fixed on both sides of the push block, the tails of the two clamping blocks are respectively sleeved on the sliding rods and slidably matched with the sliding rods, the outer side of the clamping block is provided with an inclined surface that adapts to and slides with the hypotenuse side wall of the trapezoidal groove, a pull rod is fixed to the tail of the push block and is connected to a toggle mechanism through the pull rod, a longitudinal spring is connected between the push block and the bottom side wall of the trapezoidal groove, and a pressing block that presses the clamping block is respectively provided on both sides of the trapezoidal groove on the top surface of the fixed base.

2. A tensile testing machine test fixture according to claim 1, characterized in that: The toggle mechanism includes a rack fixedly connected to the pull rod, a fan-shaped gear meshing with the rack, and a toggle rod fixedly connected to the fan-shaped gear. The fixed base is provided with a sliding hole connected to the bottom edge of the trapezoidal groove. The rack is arranged in the sliding hole and slides with it. The fixed base is provided with a mounting groove. A support shaft is provided at the axis center of the fan-shaped gear and is rotatably installed on the mounting groove through the support shaft.

3. A tensile testing machine test fixture according to claim 1, characterized in that: A transverse spring sleeved on the slide rod is respectively arranged between the inner sides of the tails of the two clamping blocks and the push block.

4. A tensile testing machine test fixture according to claim 1, characterized in that: A guide bar is arranged on the top of the clamping block and the guide of the guide bar is parallel to the oblique side wall of the trapezoidal groove. A sliding groove matching the shape of the guide bar is arranged on the pressing block and slidingly cooperates with the guide bar through the sliding groove.

5. A tensile testing machine test fixture according to claim 1 or 4, characterized in that: Positioning grooves are respectively arranged at notches on both sides of the trapezoidal groove, and the pressing blocks are fixedly installed in the positioning grooves.

6. A tensile testing machine test fixture according to claim 1, characterized in that: The inner side of the head of the clamping block is provided with a toothed anti-slip portion.

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