Clamp device for stretching test of BOPP (Biaxially-oriented Polypropylene) film

Abstract

The utility model discloses a clamp device for a BOPP (Biaxially-oriented Polypropylene) film tensile test, which relates to the technical field of film tensile tests and comprises a tensile detection table, a movable block is connected to the outer wall of the tensile detection table in a sliding manner, and an upper clamping seat is fixed at the bottom end of the movable block; a lower clamping seat is fixed below the upper clamping seat on the upper surface of the stretching detection table, and limiting mechanisms are arranged on the upper clamping seat and the lower clamping seat. By arranging the limiting mechanism, when the two ends of a material need to be clamped, pushing force is applied to the pushing block to drive the limiting block to move out of one limiting groove to be in butt joint with the other limiting groove, so that the clamping block connected with one end of the movable rod and one end of the sleeve rod is close to the upper clamping seat and the lower clamping seat, and the two ends of the material are synchronously clamped and limited; and compared with a traditional mode that a threaded rod rotates to push clamping blocks to conduct clamping, the structure can synchronously drive the clamping blocks to move, and the working efficiency is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of film stretching testing, in particular to a clamping device for BOPP film stretching testing. Background Technique

[0002] BOPP film, namely biaxially oriented polypropylene film, is generally a multi-layer co-extruded film. It is made by co-extruding polypropylene particles into a sheet and then stretching in both the longitudinal and transverse directions. Due to molecular orientation during stretching, this film has good physical stability, mechanical strength, and airtightness, high transparency and gloss, and is tough and wear-resistant. It is a widely used printing film.

[0003] In the prior art, in order to perform stretching tests on BOPP films after production to determine whether the stretching data of BOPP films is qualified, a stretching machine is needed to stretch and detect BOPP films. During the detection process, the two ends of the BOPP film need to be clamped. The existing clamping structure usually uses a threaded rod to push a clamping block to move and clamp the BOPP film, and the installation and disassembly are cumbersome. Therefore, the utility model provides a clamping device for BOPP film stretching testing. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a clamping device for BOPP film stretching testing to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A clamping device for BOPP film stretching testing, including a stretching detection table, an activity block is slidably connected to the outer wall of the stretching detection table, an upper clamping seat is fixed to the bottom end of the activity block, a lower clamping seat is fixed to the upper surface of the stretching detection table below the upper clamping seat, and a limiting mechanism is arranged on the upper clamping seat and the lower clamping seat;

[0006] The limiting mechanism includes a transmission unit and a limiting unit;

[0007] The transmission unit is used to synchronously drive the clamping blocks on the upper clamping seat and the lower clamping seat to move;

[0008] The limiting unit is used to limit the clamping blocks on the upper clamping seat and the lower clamping seat after movement.

[0009] As a further scheme of the utility model: The transmission unit includes a movable rod and a sleeve rod;

[0010] The movable rod is fixed to one side of the clamping block slidably connected to the outer wall of the upper clamping seat, and the movable rod is used to drive the sleeve rod to axially move;

[0011] The sleeve rod is sleeved on the outer wall of the movable rod and fixed to one side of the clamping block slidably connected to the outer wall of the lower clamping seat. The sleeve rod is used to drive the clamping block on the lower clamping seat to move.

[0012] As a further solution of the present invention: The limiting unit includes a push block, a pressing block, a limiting block, a limiting groove, and a spring;

[0013] The push block is laterally slidably installed on the inner wall of the clamping block of the upper clamping seat and extends to the outside of the clamping block. The push block is used to drive the pressing block and the limiting block to move synchronously;

[0014] The pressing block is fixed to the outer wall of the push block and extends to one end of the clamping block. The pressing block is used to give a thrust to the push block;

[0015] The limiting block is fixed to the outer wall on the other side of the push block and extends to the inside of the limiting groove. The limiting block is used to provide lateral movement limitation for the movable rod;

[0016] The limiting groove is formed on the inner wall of the upper clamping seat. The limiting groove is used to provide space for the insertion of the limiting block;

[0017] Both ends of the spring are respectively clamped inside the clamping block on the outer wall of the upper clamping seat and the outer wall of the push block. The spring is used to always provide an elastic squeezing force in one direction for the push block.

[0018] As a further solution of the present invention: A sliding groove for the axial sliding of the clamping block is formed on the inner wall of the upper clamping seat, and the inner wall of the limiting groove matches the outer wall of the limiting block.

[0019] As a further solution of the present invention: The number of the limiting grooves is set to two. The two limiting grooves are evenly distributed on the inner wall of the upper clamping seat, and the inner wall of the limiting groove is in an inclined state.

[0020] As a further solution of the present invention: A friction-increasing pad is arranged in the clamping groove openings of the upper clamping seat and the lower clamping seat, and a sliding groove for the lateral movement of the push block, the pressing block, and the limiting block is formed inside the clamping block of the upper clamping seat.

[0021] As a further solution of the present invention: A cylinder is installed on the inner wall of the stretching detection table, and the output end of the cylinder is fixedly connected to the outer wall of the movable block through a connecting rod.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] By setting the limit mechanism, when it is necessary to clamp both ends of the material, a thrust is applied to the push block to drive the limit block out of one limit groove and dock with another limit groove, so that the clamping blocks connected to one end of the movable rod and the sleeve rod approach the upper clamping seat and the lower clamping seat, and the two ends of the material are clamped and limited synchronously. It is also possible to release the limit on both ends of the material synchronously. Compared with the traditional method of rotating the threaded rod to push the clamping block for clamping, this structure can drive the clamping block to move synchronously, further improving the work efficiency. Brief Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of the present invention;

[0025] Figure 2 is a schematic connection structure diagram of the movable rod and the sleeve rod of the present invention;

[0026] Figure 3 is a schematic structural diagram of the limit mechanism of the present invention.

[0027] In the figure: 1, tensile test bench; 2, movable block; 3, upper clamping seat; 4, lower clamping seat; 5, limit mechanism; 501, movable rod; 502, sleeve rod; 503, push block; 504, pressing block; 505, limit block; 506, limit groove; 507, spring. Detailed Embodiment

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0029] Please refer to Figures 1-3 , in the embodiment of the present invention, a fixture device for BOPP film tensile testing includes a tensile test bench 1. A movable block 2 is slidably connected to the outer wall of the tensile test bench 1. The bottom end of the movable block 2 is fixed with an upper clamping seat 3. A lower clamping seat 4 is fixed on the upper surface of the tensile test bench 1 below the upper clamping seat 3. A limit mechanism 5 is provided on the upper clamping seat 3 and the lower clamping seat 4;

[0030] The limit mechanism 5 includes a transmission unit and a limit unit;

[0031] The transmission unit is used to drive the clamping blocks on the upper clamping seat 3 and the lower clamping seat 4 to move synchronously;

[0032] The limit unit is used to limit the clamping blocks on the upper clamping seat 3 and the lower clamping seat 4 after moving;

[0033] The transmission unit includes a movable rod 501 and a sleeve rod 502;

[0034] The movable rod 501 is fixed to one side of a clamping block that is slidably connected to the outer wall of the upper clamping seat 3. The movable rod 501 is used to drive the sleeve rod 502 to move axially;

[0035] The sleeve rod 502 is sleeved on the outer wall of the movable rod 501 and is fixed to one side of a clamping block that is slidably connected to the outer wall of the lower clamping seat 4. The sleeve rod 502 is used to drive the clamping block on the lower clamping seat 4 to move;

[0036] The limiting unit includes a push block 503, a pressing block 504, a limiting block 505, a limiting groove 506, and a spring 507;

[0037] The push block 503 is slidably installed laterally on the inner wall of the clamping block of the upper clamping seat 3 and extends to the outside of the clamping block. The push block 503 is used to drive the pressing block 504 and the limiting block 505 to move synchronously;

[0038] The pressing block 504 is fixed to the outer wall of the push block 503 and extends to one end of the clamping block. The pressing block 504 is used to give the push block 503 a thrust;

[0039] The limiting block 505 is fixed to the other outer wall of the push block 503 and extends to the inside of the limiting groove 506. The limiting block 505 is used to provide a limit for the lateral movement of the movable rod 501;

[0040] The limiting groove 506 is opened on the inner wall of the upper clamping seat 3. The limiting groove 506 is used to provide a space for the insertion of the limiting block 505;

[0041] Both ends of the spring 507 are respectively clamped inside the clamping block on the outer wall of the upper clamping seat 3 and the outer wall of the push block 503. The spring 507 is used to always provide an elastic squeezing force in one direction for the push block 503.

[0042] In this embodiment: When it is necessary to clamp the material, the two ends of the material to be detected are respectively placed in the clamping grooves between the upper clamping seat 3 and the lower clamping seat 4. By applying an outward pulling force to the push block 503, the stressed push block 503 drives the pressing block 504 and the limiting block 505 to move synchronously. Moreover, the movement of the push block 503 will also apply a squeezing force to the spring 507. The moving limiting block 505 will move out of the inside of the limiting groove 506, thereby releasing the movable limit of the clamping block on the upper clamping seat 3. At this time, the movable rod 501 can be pushed to axially move, synchronously driving the clamping block on the upper clamping seat 3 to move, so that the clamping block clamps the material located in the clamping groove. At this time, a thrust can be applied to the pressing block 504, and the stressed pressing block 504 will drive the limiting block 505 to enter the inside of another limiting groove 506. The slightly inclined inner wall of the limiting groove 506 will further cause the movable rod 501 to drive the clamping block to apply a squeezing force to the outer wall of the material. The movement of the movable rod 501 will also synchronously drive the sleeve rod 502 to move, thereby performing synchronous clamping and limiting on the upper and lower ends of the material. Then, the air cylinder can be started to drive the movable block 2 to move upward, so that the upper clamping seat 3 gradually moves away from the lower clamping seat 4, thereby detecting the material clamped between the upper clamping seat 3 and the lower clamping seat 4, achieving the purpose of facilitating the quick clamping of the material and further improving the work efficiency.

[0043] Please refer specifically to Figures 1-3 , a sliding groove for the axial sliding of the clamping block is formed on the inner wall of the upper clamping seat 3. The inner wall of the limiting groove 506 matches the outer wall of the limiting block 505. The number of the limiting grooves 506 is set to two, and the two limiting grooves 506 are evenly distributed on the inner wall of the upper clamping seat 3. The inner wall of the limiting groove 506 is in an inclined state. A cushion block for increasing friction is arranged at the clamping groove opening of the upper clamping seat 3 and the lower clamping seat 4. A sliding groove for the lateral movement of the push block 503, the pressing block 504, and the limiting block 505 is formed on the inner side of the clamping block on the upper clamping seat 3. An air cylinder is installed on the inner wall of the tensile testing table 1, and the output end of the air cylinder is fixedly connected to the outer wall of the movable block 2 through a connecting rod.

[0044] In this embodiment: Through this structure, when the movable block 2 moves upward under the thrust from the air cylinder, the upward-moving movable block 2 will synchronously drive the upper clamping seat 3 to move upward. By applying a pulling force to the material through the clamping block on the upper clamping seat 3, the material can be tested. The upward movement of the upper clamping seat 3 will also synchronously drive the movable rod 501 to move upward, causing the movable rod 501 to move relatively inside the sleeve rod 502, without affecting the synchronous movement of the clamping block on the lower clamping seat 4.

[0045] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, making equivalent substitutions or changes should be covered within the protection scope of the present utility model.

Claims

1. A fixture device for BOPP film tensile testing, comprising a tensile testing platform (1), wherein the outer wall of the tensile testing platform (1) is slidably connected to a movable block (2), an upper clamping seat (3) is fixed to the bottom end of the movable block (2), and a lower clamping seat (4) is fixed to the upper surface of the tensile testing platform (1) below the upper clamping seat (3), characterized in that: A limiting mechanism (5) disposed on the upper clamping seat (3) and the lower clamping seat (4); The limiting mechanism (5) comprises a transmission unit and a limiting unit; The transmission unit is used to synchronously drive the clamping blocks on the upper clamping seat (3) and the lower clamping seat (4) to move; The limiting unit is used to limit the clamping blocks on the upper clamping seat (3) and the lower clamping seat (4) after they have moved.

2. A BOPP film tensile test fixture according to claim 1, characterized in that: The transmission unit comprises a movable rod (501) and a sleeve rod (502); The movable rod (501) is fixed to one side of a clamping block slidably connected to the outer wall of the upper clamping seat (3), and the movable rod (501) is used to drive the sleeve rod (502) to move axially; The sleeve rod (502) is sleeved on the outer wall of the movable rod (501) and fixed to one side of a clamping block slidably connected to the outer wall of the lower clamping seat (4). The sleeve rod (502) is used to drive the clamping block on the lower clamping seat (4) to move.

3. A BOPP film tensile test fixture according to claim 2, characterized in that: The limiting unit comprises a push block (503), a pressing block (504), a limiting block (505), a limiting groove (506), and a spring (507); The push block (503) is laterally slidably mounted on the inner wall of the clamping block on the upper clamping seat (3) and extends to the outer side of the clamping block, and the push block (503) is used to drive the pressing block (504) and the limit block (505) to move synchronously; The pressing block (504) is fixed on the outer wall of the pushing block (503) and extends to one end of the clamping block, and the pressing block (504) is used to give the pushing block (503) a thrust; The limit block (505) is fixed to the outer wall of the other side of the push block (503) and extends to the inner side of the limit groove (506), and the limit block (505) is used to provide a limit for the lateral movement of the movable rod (501); The limiting groove (506) is provided on the inner wall of the upper clamping seat (3), and the limiting groove (506) is used to provide space for inserting the limiting block (505); The two ends of the spring (507) are respectively clamped on the inner side of the clamping block of the outer wall of the upper clamping seat (3) and the outer wall of the push block (503), and the spring (507) is used to always provide a directional elastic squeezing force for the push block (503).

4. A BOPP film tensile test fixture according to claim 3, characterized in that: The inner wall of the upper clamping seat (3) is formed with a sliding groove for the clamping block to slide axially, and the inner wall of the limiting groove (506) matches the outer wall of the limiting block (505).

5. A BOPP film tensile test fixture according to claim 3, characterized in that: The number of the limiting grooves (506) is two, and the two limiting grooves (506) are evenly distributed on the inner wall of the upper clamping seat (3), and the inner wall of the limiting grooves (506) is in an inclined state.

6. A BOPP film tensile test fixture according to claim 3, characterized in that: Pads for increasing friction are arranged in the clamping notches on the upper clamping seat (3) and the lower clamping seat (4), and sliding grooves for lateral movement of the push block (503), the pressing block (504) and the limit block (505) are formed on the inner side of the clamping block on the upper clamping seat (3).

7. A BOPP film tensile test fixture according to claim 1, characterized in that: A cylinder is installed on the inner wall of the stretching test bench (1), and the output end of the cylinder is fixedly connected to the outer wall of the movable block (2) via a connecting rod.

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