A tear-resistant pe film tensile tester

Abstract

This utility model provides a tear-resistant PE film tensile testing machine, relating to the field of PE film tensile testing technology. It includes: a tensile testing machine platform; a limiting frame welded to the platform surface; a positioning roller mounted on the platform surface via a connecting frame; a tensile roller positioned above the positioning roller; a fixed frame connected to the rear side of the tensile roller via a connecting column; a motor shaft-connected to the front ends of both the tensile roller and the positioning roller; vacuum adsorption holes on the roller surfaces of both the tensile roller and the positioning roller; a tensile table connected to the upper end of the fixed frame via an electronic extensometer; a ball screw drive mechanism connected to the right side of the tensile table via a nut block; and a vacuum pump placed on the platform surface, connected to the tensile roller and the positioning roller via vacuum pipes and branch pipes respectively. This utility model solves the problem in the prior art where, when multiple anti-detachment rods on the upper clamp press the PE film into the limiting groove, the film surface is easily subjected to uneven pressure, affecting the accuracy of the tensile test.

Description

Technical Field

[0001] This utility model relates to the field of PE film tensile testing technology, specifically to a tear-resistant PE film tensile testing machine. Background Technology

[0002] PE protective film uses special polyethylene (PE) plastic film as the base material. Based on different densities, it is divided into high-density polyethylene protective film, medium-density polyethylene, and low-density polyethylene. In PE film production, tensile testing is required to ensure that the quality of the tear-resistant PE film meets relevant standards and usage requirements. A search revealed existing technology (announcement number: CN202323541627.1) for a film tensile testing device. The document describes how "the lower and upper clamps can clamp the film during the stretching process, and the limiting groove on the lower clamp and the anti-detachment rod on the upper clamp can prevent the film from falling off during clamping, improving the testing effect." However, in the existing technology, when the multiple anti-detachment rods of the upper clamp press the PE film down into the limiting groove, the film surface is prone to uneven pressure, affecting the accuracy of the tensile test. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, a tear-resistant PE film tensile testing machine is provided to solve the problem that, in existing technologies, when multiple anti-detachment rods on the upper clamp press the PE film into the limiting groove, the film surface is easily subjected to uneven pressure, which affects the accuracy of the tensile test.

[0004] To achieve the above objectives, a tear-resistant PE film tensile testing machine is provided, comprising: a tensile testing machine platform, wherein a limiting frame is welded to the surface of the tensile testing machine platform.

[0005] The tensile testing machine platform is equipped with a positioning roller mounted on the platform via a connecting frame. A tensile roller is positioned above the positioning roller. A fixed frame is connected to the rear side of the tensile roller via a connecting column. A motor is shaft-connected to the front end of both the tensile roller and the positioning roller. Vacuum adsorption holes are opened on the roller surfaces of both the tensile roller and the positioning roller. A tensile table is connected to the upper end of the fixed frame via an electronic extensometer. A ball screw drive mechanism is connected to the right side of the tensile table via a nut block. A vacuum pump is placed on the platform of the tensile testing machine. The vacuum pump is connected to the tensile roller and the positioning roller via a vacuum tube and a branch tube, respectively.

[0006] Furthermore, a tensioning table is slidably connected to the inner side of the limiting frame, and the ball screw transmission mechanism is installed on the inner side of the right end of the limiting frame.

[0007] Furthermore, a display control unit is provided on the right side of the limiting frame, and a displacement sensor is installed on the right side of the stretching table; and the displacement sensor is electrically connected to the display control unit.

[0008] Furthermore, both the stretching roller and the positioning roller are fitted with anti-slip pads, and the anti-slip pads have holes on their surfaces; and the holes are distributed correspondingly to the vacuum adsorption holes.

[0009] Furthermore, both the stretching roller and the positioning roller have connecting columns fixed to their rear ends, and branch pipes are connected to the rear cylindrical surfaces of the connecting columns.

[0010] Furthermore, the vacuum tube is connected to two sets of branch pipes via pipe joints, and the vacuum pump is located at the left end of the positioning roller.

[0011] Furthermore, the inner sides of the stretching roller, positioning roller, and connecting column are all provided with negative pressure cavities; and the cross-section of the negative pressure cavity is fan-shaped.

[0012] Furthermore, the vacuum adsorption hole is connected to the branch pipe through a negative pressure chamber.

[0013] The beneficial effects of this utility model are as follows: the tear-resistant PE film tensile testing machine of this utility model uses a vacuum pump to use vacuum adsorption holes on the surface of the stretching roller and the positioning roller to adsorb both ends of the PE film. The stretching roller and the positioning roller are driven by a motor to rotate in opposite directions at a uniform speed, so that the PE film is adsorbed, rolled up and fixed on the stretching roller and the positioning roller. This makes it easy for the PE film surface to be evenly stressed and fixed on the tensile testing machine, avoiding damage to the PE film before the tensile test. It ensures that the tensile testing machine can efficiently and stably clamp and fix the film to be stretched, and improves the accuracy of the tensile testing machine. Attached Figure Description

[0014] Figure 1 This is a front view structural schematic diagram of the tear-resistant PE film tensile testing machine according to an embodiment of the present utility model.

[0015] Figure 2 This is a front view cross-sectional structural diagram of the tear-resistant PE film tensile testing machine according to an embodiment of the present invention.

[0016] Figure 3 This is a three-dimensional structural diagram of the stretching roller according to an embodiment of the present invention.

[0017] Figure 4 This is a three-dimensional structural diagram of the internal cross-section of the stretching roller according to an embodiment of the present invention.

[0018] In the diagram: 1. Tensile testing machine stand; 11. Limiting frame; 12. Display and control unit; 2. Tensile roller; 21. Positioning roller; 22. Motor; 23. Fixing frame; 24. Anti-slip pad; 25. Vacuum adsorption hole; 26. Negative pressure chamber; 27. Connecting column; 3. Electronic extensometer; 4. Tensile table; 41. Displacement sensor; 42. Ball screw drive mechanism; 5. Vacuum pump; 51. Vacuum tube; 52. Branch tube. Detailed Implementation

[0019] Reference Figures 1 to 4 As shown, this utility model provides a tear-resistant PE film tensile testing machine, including: a tensile testing machine platform 1, with a limiting frame 11 welded to the upper surface of the tensile testing machine platform 1.

[0020] A positioning roller 21 is installed on the upper surface of the tensile testing machine platform 1 via a connecting frame. A tensile roller 2 is set on the upper end of the positioning roller 21. A fixed frame 23 is connected to the rear side of the tensile roller 2 via a connecting column 27. A motor 22 is shaft-connected to the front end of both the tensile roller 2 and the positioning roller 21. Vacuum adsorption holes 25 are opened on the roller surface of both the tensile roller 2 and the positioning roller 21. A tensile table 4 is connected to the upper end of the fixed frame 23 via an electronic extensometer 3. A ball screw transmission mechanism 42 is connected to the right side of the tensile table 4 via a nut block. A vacuum pump 5 is placed on the platform of the tensile testing machine platform 1. The vacuum pump 5 is connected to the tensile roller 2 and the positioning roller 21 via a vacuum pipe 51 and a branch pipe 52, respectively.

[0021] First, the two ends of the tear-resistant PE film are attached to the vacuum adsorption holes 25 of the stretching roller 2 and the positioning roller 21. The vacuum pump 5 is started so that the vacuum adsorption holes 25 adsorb the PE film. Then, the motor 22 drives the stretching roller 2 and the positioning roller 21 to wind the PE film in the opposite direction at a uniform speed, so that the PE film is continuously wound up to a state of near tautness. At this time, the ball screw transmission mechanism 42 is controlled to convert the rotational motion of the screw into linear motion, which pushes the stretching table 4 to move upward, so that the stretching table 4 drives the stretching roller 2 to rise, thereby realizing the stretching test of the PE film. During the stretching process, the sensor of the electronic extensometer 3 converts the deformation of the PE film into an electrical signal (such as voltage or current change), which is amplified by the amplifier and transmitted to the display control unit 12, so as to obtain the test value of the tear-resistant PE film.

[0022] In this embodiment, a tensioning table 4 is slidably connected to the inner side of the limiting frame 11, and a ball screw transmission mechanism 42 is installed on the inner side of the right end of the limiting frame 11. A display control unit 12 is provided on the right end of the limiting frame 11, and a displacement sensor 41 is installed on the right end of the tensioning table 4; and the displacement sensor 41 is electrically connected to the display control unit 12.

[0023] In a preferred embodiment, the limiting frame 11 is used to limit the movement of the stretching table 4, allowing the stretching table 4 to move vertically up and down. The ball screw transmission mechanism 42 mainly consists of a ball screw, a nut block, and a servo motor. The servo motor drives the ball screw to rotate, and the nut block converts the rotational motion of the ball screw into linear motion, thereby driving the stretching roller 2 to move upward and stretch the PE film. The displacement sensor 41 monitors the movement position of the stretching roller 2. The display control unit 12 is the input and output part of the display and control unit, which can intuitively display information to the operator.

[0024] In this embodiment, anti-slip pads 24 are fixedly fitted onto the surfaces of both the stretching roller 2 and the positioning roller 21. The anti-slip pads 24 have holes on their surfaces, and these holes correspond to the vacuum adsorption holes 25. Connecting posts 27 are fixed to the rear ends of both the stretching roller 2 and the positioning roller 21, and branch pipes 52 are connected to the rear surfaces of the connecting posts 27. Two sets of branch pipes 52 are connected to the vacuum pipe 51 via pipe joints. The vacuum pump 5 is located at the left end of the positioning roller 21. Negative pressure chambers 26 are provided inside the stretching roller 2, the positioning roller 21, and the connecting posts 27; the cross-section of the negative pressure chambers 26 is fan-shaped. The vacuum adsorption holes 25 are connected to the branch pipes 52 through the negative pressure chambers 26.

[0025] In a preferred embodiment, the anti-slip pad 24 serves to prevent slippage, ensuring that the PE film adheres fully to the surfaces of the stretching roller 2 and the positioning roller 21. The vacuum pump 5 maintains a negative pressure state in the vacuum adsorption hole 25 through the vacuum tube 51 and the branch tube 52, tightly adsorbing the PE film adhering to the vacuum adsorption hole 25. The motor 22 drives the stretching roller 2 and the positioning roller 21 to rotate in opposite directions at a uniform speed, causing the two ends of the PE film to be wound and rolled up onto the roller surface. This facilitates quick and easy fixing of the two ends of the PE film, ensuring that the film surface is evenly stressed and fixed on the tensile testing machine, preventing damage to the PE film before the tensile test, and ensuring that the tensile testing machine can efficiently and stably clamp and fix the film to be stretched.

[0026] This utility model of a tear-resistant PE film tensile testing machine effectively solves the problem in the prior art where the PE film is pressed down into the limiting groove by multiple anti-detachment rods on the upper clamping plate, resulting in uneven pressure on the film surface and affecting the accuracy of the tensile test. It facilitates the uniform force on the PE film surface and fixes it on the tensile testing machine, avoiding damage to the PE film before the tensile test. It ensures that the tensile testing machine can efficiently and stably clamp and fix the film to be stretched, improving the accuracy of the tensile testing machine. It is suitable for tear-resistant PE film tensile testing machines.

Claims

1. A tear-resistant PE film tensile testing machine, comprising: A tensile testing machine stand (1), wherein a limiting frame (11) is welded to the upper surface of the tensile testing machine stand (1), characterized in that: The tensile testing machine platform (1) has a positioning roller (21) mounted on its upper surface via a connecting frame. A tensile roller (2) is mounted on the upper end of the positioning roller (21). A fixed frame (23) is connected to the rear side of the tensile roller (2) via a connecting column (27). A motor (22) is axially connected to the front end of both the tensile roller (2) and the positioning roller (21). Vacuum adsorption holes (25) are opened on the roller surfaces of both the tensile roller (2) and the positioning roller (21). A tensile table (4) is connected to the upper end of the fixed frame (23) via an electronic extensometer (3). A ball screw transmission mechanism (42) is connected to the right side of the tensile table (4) via a nut block. A vacuum pump (5) is placed on the platform of the tensile testing machine platform (1). The vacuum pump (5) is connected to the tensile roller (2) and the positioning roller (21) via a vacuum tube (51) and a branch tube (52) respectively.

2. The tear-resistant PE film tensile testing machine according to claim 1, characterized in that, The tensioning table (4) is slidably connected to the inner side of the limiting frame (11), and the ball screw transmission mechanism (42) is installed at the inner side of the right end of the limiting frame (11).

3. The tear-resistant PE film tensile testing machine according to claim 1, characterized in that, The right end of the limiting frame (11) is provided with a display control unit (12), and the right end of the stretching table (4) is provided with a displacement sensor (41); and the displacement sensor (41) is electrically connected to the display control unit (12).

4. The tear-resistant PE film tensile testing machine according to claim 1, characterized in that, The surface of both the stretching roller (2) and the positioning roller (21) is fitted with an anti-slip pad (24), and the surface of the anti-slip pad (24) is provided with holes; and the holes are distributed in correspondence with the vacuum adsorption holes (25).

5. The tear-resistant PE film tensile testing machine according to claim 1, characterized in that, Both the stretching roller (2) and the positioning roller (21) have a connecting column (27) fixed at their rear ends, and a branch pipe (52) is connected to the rear cylindrical surface of the connecting column (27).

6. The tear-resistant PE film tensile testing machine according to claim 1, characterized in that, The vacuum tube (51) is connected to two sets of branch pipes (52) through pipe joints, and the vacuum pump (5) is located at the left end of the positioning roller (21).

7. The tear-resistant PE film tensile testing machine according to claim 1, characterized in that, The inner sides of the stretching roller (2), positioning roller (21) and connecting column (27) are all provided with negative pressure cavities (26); and the cross-section of the negative pressure cavity (26) is fan-shaped.

8. The tear-resistant PE film tensile testing machine according to claim 7, characterized in that, The vacuum adsorption hole (25) is connected to the branch pipe (52) through the negative pressure chamber (26).

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