Test clamp of plastic tension tester

Abstract

The utility model belongs to the technical field of clamps, and particularly relates to a test clamp of a plastic tension tester, which comprises a main body, a tension clamp is mounted in the main body, a first cavity penetrating through the outer wall is arranged in the tension clamp, a fixing block is mounted at the bottom of the tension clamp, and a second cavity is arranged below the first cavity. According to the utility model, the slot is formed in the clamping block, the movable block is arranged in the slot through the mutual matching of the guide groove and the guide post, the back surface of the movable block is a flat surface, and the front surface of the movable block is a V-shaped inward concave groove, so that when a flat plastic product is clamped, the direction of the movable block is turned, and the plane part faces the plastic product; when a cylindrical product is clamped, the inner concave part faces the plastic product, the plane part and the inner concave part can be flush with the clamping block, the movable block is arranged in the clamping block, the plastic products of different styles are clamped, the use diversity is increased, additional specific clamping blocks do not need to be independently arranged, and the equipment use cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of clamps and relates to a test clamp of a plastic tensile testing machine. Background Art

[0002] Plastic tensile testing machine is a device used for plastic tensile testing. The plastic tensile testing machine adopts mechatronics design, mainly composed of force sensors, transmitters, microprocessors, load drive mechanisms, computers and color inkjet printers. In the early stage of the test, the plastic products to be tested need to be fixed by the test fixture, and the plastic in the middle needs to be kept vertical. The plastic tensile testing machine can be used to test non-metallic materials such as plastics and metal materials for stretching, compression, bending, tearing, shearing, adhesion, pull-out force, elongation and other tests. The computer monitor displays the test process and curves throughout the process, and the microcomputer automatically transmits the test settings and test data. Users can modify the test report according to their own requirements and output standard reports.

[0003] The test fixture of the existing testing machine generally fixes the plastic by means of an internal clamping block. The contact surface of the ordinary clamping block is flat, so it can only fix square plastic products, but cannot effectively fix small cylindrical products. Equipping additional specific clamping blocks separately increases the use cost of the test equipment. Utility Model Content

[0004] The utility model aims to solve the above problems and provides a test fixture for a plastic tensile testing machine.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A test fixture of a plastic tensile testing machine comprises a main body, a tensile fixture is installed inside the main body, a No. 1 cavity penetrating the outer wall is provided in the tensile fixture, a fixing block is installed at the bottom of the tensile fixture, a No. 2 cavity is provided below the No. 1 cavity, connecting blocks are symmetrically installed in the No. 2 cavity, and rectangular grooves are formed between adjacent connecting blocks, a groove penetrating the outer wall is provided on the outer wall of the tensile fixture, an outer limiting plate is installed in the groove, a clamping block is installed in the No. 1 cavity, and scale lines are provided on the outer wall of the clamping block, and the A connecting groove is provided at the bottom of the clamping block, a gear rod is installed in the rectangular groove, a traction block is installed on the top of the gear rod, a gear is provided on the outward side of the gear rod, a pull rod is installed on the outside of the gear, connecting seats are installed on the left and right sides of the gear, a slot is provided on the outer wall of the clamping block, a guide groove is provided on the inner wall of the slot, an inner limit plate is installed on the outer side of the slot, a movable block is movably installed in the slot, the back side of the movable block is provided as a flat portion, the front side of the movable block is provided with an inner concave portion, and guide blocks are installed on both sides of the movable block.

[0007] In the test fixture of the above-mentioned plastic tensile testing machine, the No. 1 cavity, the No. 2 cavity and the rectangular groove are interconnected, the height of the connecting block is lower than the No. 2 cavity, and a threaded hole is provided on the connecting block.

[0008] In the test fixture of the above-mentioned plastic tensile testing machine, the inner wall of the No. 1 cavity is set as a bevel inclined to both sides, and the bottom inner wall of the No. 1 cavity is set as an arc, and the size of the No. 1 cavity is larger than that of the No. 2 cavity.

[0009] In the test fixture of the above-mentioned plastic tensile testing machine, the grooves are symmetrically arranged on both sides of the first cavity, the length of the outer limit plate is greater than the groove, and the groove and the outer limit plate are connected by bolts.

[0010] In the test fixture of the above-mentioned plastic tensile testing machine, the clamp block is symmetrically installed in cavity No. 1, and the outer contour of the clamp block is trapezoidal. At the same time, the oblique edge of the clamp block is in contact with the inner wall of cavity No. 1 and is slidably connected, and the connecting groove is provided with an opening facing inward.

[0011] In the test fixture of the above-mentioned plastic tensile testing machine, the gear rod is inserted into the fixed block, the gear rod is slidably connected to the fixed block and the rectangular groove, the length of the traction block is greater than the connecting groove, and the traction block is located in the adjacent connecting groove.

[0012] In the test fixture of the plastic tensile testing machine, the gear and the teeth on the gear rod are meshed with each other, the size of the connecting seat is the same as that of the connecting block, and the connecting seat and the connecting block are connected by bolts.

[0013] In the test fixture of the above-mentioned plastic tensile testing machine, a pin is installed at the center of the circle of the gear, and the gear is rotatably connected with the connecting seat through the pin.

[0014] In the test fixture of the above-mentioned plastic tensile testing machine, the slot and the movable block have the same height, the positions and the numbers of the guide slots and the guide blocks correspond, and the size of the guide blocks is smaller than the guide slots.

[0015] In the test fixture of the plastic tensile testing machine, the inner recess is V-shaped, and the slot and the movable block have the same outer contour.

[0016] Compared with the existing technology, the advantages of the utility model are:

[0017] The utility model provides a slot in the clamping block, and a movable block is installed in the slot by means of a guide slot and a guide column that cooperate with each other. The back of the movable block is set as a flat surface, and the back of the movable block is set as a V-shaped inwardly concave groove. When clamping a flat plastic product, the direction of the movable block is turned so that the flat surface faces the plastic product. When clamping a cylindrical product, the inner concave portion is turned outward so that the inner concave portion faces the plastic product. Both the flat surface and the inner concave portion can be flush with the clamping block. By equipping the clamping block with the movable block, the use diversity of clamping plastic products of different styles is increased, and there is no need to separately equip additional specific clamping blocks, thereby reducing the cost of equipment use.

[0018] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0020] Figure 2 It is a schematic diagram of the tension clamp in the utility model.

[0021] Figure 3 It is a schematic diagram of the internal structure of the tension clamp in the utility model.

[0022] Figure 4 It is a structural schematic diagram of the gear and the pull rod in the utility model.

[0023] Figure 5 It is a structural schematic diagram of the connecting seat in the utility model.

[0024] Figure 6 It is a top view schematic diagram of the clamping block in the utility model.

[0025] Figure 7 It is a structural schematic diagram of the movable block in the utility model.

[0026] In the figure: 1. main body; 2. tension clamp; 21. cavity No. 1; 22. fixed block; 23. cavity No. 2; 24. connecting block; 25. rectangular groove; 3. groove; 31. outer limit plate; 4. clamping block; 41. scale line; 42. connecting groove; 5. gear rod; 51. traction block; 6. gear; 61. pull rod; 62. connecting seat; 7. slot; 71. guide groove; 72. inner limit plate; 8. movable block; 81. flat part; 82. inner concave part; 83. guide block. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings.

[0028] like Figure 1-7As shown, a test fixture of a plastic tensile testing machine comprises a main body 1, a tensile fixture 2 is installed inside the main body 1, a No. 1 cavity 21 penetrating the outer wall is provided in the tensile fixture 2, a fixing block 22 is installed at the bottom of the tensile fixture 2, a No. 2 cavity 23 is provided below the No. 1 cavity 21, connecting blocks 24 are symmetrically installed in the No. 2 cavity 23, and rectangular grooves 25 are formed between adjacent connecting blocks 24, a groove 3 penetrating the outer wall is provided on the outer wall of the tensile fixture 2, an outer limiting plate 31 is installed in the groove 3, a clamping block 4 is installed in the No. 1 cavity 21, and a scale line 41 is provided on the outer wall of the clamping block 4, and the clamping block 4 is provided with a clamping block 4. A connecting groove 42 is provided at the bottom of the block 4, a gear rod 5 is installed in the rectangular groove 25, a traction block 51 is installed on the top of the gear rod 5, a gear 6 is provided on the outward side of the gear rod 5, a pull rod 61 is installed on the outside of the gear 6, and connecting seats 62 are installed on the left and right sides of the gear 6. The clamping block 4 has a slot 7 on the outer wall, a guide slot 71 is provided on the inner wall of the slot 7, an inner limit plate 72 is installed on the outer side of the slot 7, a movable block 8 is movably installed in the slot 7, the back of the movable block 8 is set as a flat portion 81, the front of the movable block 8 is set as an inner recessed portion 82, and guide blocks 83 are installed on both sides of the movable block 8.

[0029] In this embodiment, the tensile clamp 2 is an existing clamp in a plastic tensile testing machine. The plastic tensile testing machine here is an existing mature technology and is well known to professionals in this field. The equipment operation and working principle of the plastic tensile testing machine do not belong to the technical points of this case, so they are not described in detail.

[0030] Combination Figure 2 , Figure 3 As shown, the No. 1 cavity 21, the No. 2 cavity 23 and the rectangular groove 25 are interconnected, the height of the connecting block 24 is lower than the No. 2 cavity 23, and a threaded hole is provided on the connecting block 24. The inner wall of the No. 1 cavity 21 is set as a bevel inclined to both sides, and the bottom inner wall of the No. 1 cavity 21 is set as an arc, and the size of the No. 1 cavity 21 is larger than the No. 2 cavity 23. The clamping block 4 is symmetrically installed in the No. 1 cavity 21, and the outer contour of the clamping block 4 is a trapezoid. At the same time, the bevel of the clamping block 4 and the inner wall of the No. 1 cavity 21 are fitted and slidably connected, and the connecting groove 42 is provided with an opening facing inward.

[0031] Furthermore, the No. 1 cavity 21 presents a trend of gradually increasing space from top to bottom. This design allows that when the tension clamp 2 is in use, when the internal clamping blocks 4 move upward or downward, the distance between adjacent clamping blocks 4 will also increase or decrease accordingly.

[0032] Combination Figure 2 , Figure 3As shown, the groove 3 is symmetrically arranged on both sides of the first cavity 21, the length of the outer limit plate 31 is greater than the groove 3, and the groove 3 and the outer limit plate 31 are connected by bolts.

[0033] Furthermore, the outer limiting plate 31 fixed by bolts here can play a role in limiting the clamping block 4 to prevent the clamping block 4 from falling off from the No. 1 cavity 21.

[0034] Combination Figure 2 , Figure 3 As shown, the gear rod 5 is inserted into the fixed block 22 , and the gear rod 5 is slidably connected to the fixed block 22 and the rectangular groove 25 . The length of the traction block 51 is greater than the connecting groove 42 , and the traction block 51 is located in the adjacent connecting groove 42 .

[0035] Furthermore, the gear rod 5 is located in the rectangular groove 25 and is also inserted into the fixing block 22 . The length of the traction block 51 is greater than the connecting groove 42 . When the distance between adjacent clamping blocks 4 increases, the traction block 51 will not fall off from the connecting groove 42 .

[0036] Combination Figure 1 , Figure 2 , Figure 3 As shown, the gear 6 is meshed with the teeth on the gear rod 5, the size of the connecting seat 62 is the same as the connecting block 24, and the connecting seat 62 and the connecting block 24 are connected by bolts. A pin is installed at the center of the gear 6, and the gear 6 is rotatably connected to the connecting seat 62 through the pin.

[0037] Furthermore, the connecting seat 62 can be installed on the connecting block 24 by bolts, and the gear 6 and the gear rod 5 are meshed. By pulling the pull rod 61, the gear 6 is driven to rotate through the pin in the middle of the connecting seat 62, and the rotation of the gear 6 drives the gear rod 5 to move upward or downward.

[0038] Combination Figure 2 , Figure 6 , Figure 7 As shown, the slot 7 and the movable block 8 have the same height, the guide slot 71 and the guide block 83 have corresponding positions and numbers, and the guide block 83 is smaller than the guide slot 71. The inner recess 82 is V-shaped, and the slot 7 and the movable block 8 have the same outer contour.

[0039] Furthermore, the movable block 8 is inserted into the guide groove 71 through the guide blocks 83 on both sides. When clamping a flat plastic product, the direction of the movable block 8 is turned so that the flat portion 81 faces the plastic product. When clamping a cylindrical product, the inner recessed portion 82 is facing outward so that the inner recessed portion 82 faces the plastic product.

[0040] The working principle of the utility model is:

[0041] When installing the movable block 8, first remove the outer limit plate 31, then take out the clamping block 4, and then remove the inner limit plate 72. Then, according to whether the plastic product to be tested is a small rod or a square, adjust the orientation of the front and rear side plane portions 81 and the inner recessed portion 82 of the movable block 8 accordingly, align the guide block 83 with the guide groove 71 and insert it, move the inner limit plate 72 to the outside of the movable block 8 to form a barrier position, and then use bolts to fix the position of the inner limit plate 72.

[0042] When the tension clamp 2 is in use, the pull rod 61 is pushed upward, and then the gear 6 is driven by the pull rod 61, and its body rotates counterclockwise between the connecting seats 62 based on the pin shaft. Since the gear 6 and the gear rod 5 are engaged with each other, the gear rod 5 moves along the rectangular groove 25 toward the inside of the fixed block 22 under the drive of the gear 6. The gear rod 5 drags the clamping blocks 4 on the left and right sides through the traction block 51 at the top, allowing the clamping blocks 4 to move along the inner wall of the No. 1 cavity 21, and then the distance between the clamping blocks 4 becomes larger, and the product can be placed between the clamping blocks 4 at this time.

[0043] Then push the pull rod 61 downward, and the gear 6 is driven by the pull rod 61 to rotate clockwise between the connecting seats 62 based on the pin shaft, and the gear rod 5 moves upward. At the same time, the clamping blocks 4 on the left and right sides are pushed to move upward along the inner wall of the No. 1 cavity 21 through the traction block 51. Gradually, the distance between adjacent clamping blocks 4 becomes smaller until the plastic product in the middle is fixed. During the experiment, it is necessary to pull in the reverse direction through the tension clamp 2 to apply a reverse force to the plastic product. During this period, the clamping block 4 will also be driven by the plastic product and tend to move upward along the inner wall of the No. 1 cavity 21. It will only become tighter and tighter and will not fall off.

[0044] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways without departing from the spirit of the present invention.

[0045] Although this article uses more terms such as 1, main body; 2, tension clamp; 21, cavity No. 1; 22, fixed block; 23, cavity No. 2; 24, connecting block; 25, rectangular groove; 3, groove; 31, outer limit plate; 4, clamping block; 41, scale line; 42, connecting groove; 5, gear rod; 51, traction block; 6, gear; 61, pull rod; 62, connecting seat; 7, slot; 71, guide groove; 72, inner limit plate; 8, movable block; 81, plane part; 82, inner concave part; 83, guide block., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the utility model. It is contrary to the spirit of the utility model to interpret them as any additional restrictions.

Claims

1. A test fixture for a plastic tensile testing machine, comprising a main body (1), characterized in that: A tension clamp (2) is installed inside the main body (1), a first cavity (21) penetrating the outer wall is provided in the tension clamp (2), a fixing block (22) is installed at the bottom of the tension clamp (2), a second cavity (23) is provided below the first cavity (21), connecting blocks (24) are symmetrically installed in the second cavity (23), and rectangular grooves (25) are formed between adjacent connecting blocks (24), a groove (3) penetrating the outer wall is provided on the outer wall of the tension clamp (2), an outer limiting plate (31) is installed in the groove (3), a clamping block (4) is installed in the first cavity (21), a scale line (41) is provided on the outer wall of the clamping block (4), and a connecting groove (42) is provided at the bottom of the clamping block (4), A gear rod (5) is installed in the rectangular groove (25), a traction block (51) is installed on the top of the gear rod (5), a gear (6) is arranged on the outward side of the gear rod (5), a pull rod (61) is installed outside the gear (6), connecting seats (62) are installed on the left and right sides of the gear (6), a slot (7) is provided on the outer wall of the clamping block (4), a guide slot (71) is provided on the inner wall of the slot (7), an inner limit plate (72) is installed on the outer side of the slot (7), a movable block (8) is movably installed in the slot (7), the back side of the movable block (8) is arranged as a flat surface portion (81), the front side of the movable block (8) is arranged with an inner concave portion (82), and guide blocks (83) are installed on both sides of the movable block (8).

2. The test fixture of the plastic tensile testing machine according to claim 1, characterized in that: The first cavity (21), the second cavity (23) and the rectangular groove (25) are interconnected, the height of the connecting block (24) is lower than that of the second cavity (23), and a threaded hole is provided on the connecting block (24).

3. The test fixture of the plastic tensile testing machine according to claim 2, characterized in that: The inner wall of the No. 1 cavity (21) is configured as an oblique edge inclined toward both sides, and the bottom inner wall of the No. 1 cavity (21) is configured as an arc shape. The size of the No. 1 cavity (21) is larger than that of the No. 2 cavity (23).

4. The test fixture of the plastic tensile testing machine according to claim 3, characterized in that: The groove (3) is symmetrically arranged on both sides of the first cavity (21); the length of the outer limit plate (31) is greater than the groove (3); and the groove (3) and the outer limit plate (31) are connected by bolts.

5. The test fixture of the plastic tensile testing machine according to claim 4, characterized in that: The clamping block (4) is symmetrically installed in the first cavity (21); the outer contour of the clamping block (4) is a trapezoid; the oblique side of the clamping block (4) is in contact with the inner wall of the first cavity (21) and is slidably connected; and the connecting groove (42) is provided with an opening facing inward.

6. The test fixture of the plastic tensile testing machine according to claim 5, characterized in that: The gear rod (5) is inserted into the fixed block (22), and the gear rod (5) is slidably connected to the fixed block (22) and the rectangular groove (25). The length of the traction block (51) is greater than the connection groove (42), and the traction block (51) is located in an adjacent connection groove (42).

7. The test fixture of the plastic tensile testing machine according to claim 6, characterized in that: The teeth on the gear (6) and the gear rod (5) are meshed with each other, the size of the connecting seat (62) is the same as that of the connecting block (24), and the connecting seat (62) and the connecting block (24) are connected by bolts.

8. The test fixture of the plastic tensile testing machine according to claim 7, characterized in that: A pin is installed at the center of the gear (6), and the gear (6) is rotatably connected to a connecting seat (62) via the pin.

9. The test fixture of the plastic tensile testing machine according to claim 8, characterized in that: The slot (7) and the movable block (8) have the same height, the positions and numbers of the guide grooves (71) and the guide blocks (83) correspond, and the size of the guide blocks (83) is smaller than that of the guide grooves (71).

10. The test fixture of the plastic tensile testing machine according to claim 9, characterized in that: The inner recess (82) is V-shaped, and the slot (7) and the movable block (8) have the same outer contour.

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