Plastic film tearing resistance detection device

Abstract

The utility model relates to the technical field of film detection, and discloses a plastic film tearing resistance detection device which comprises a sampling box and a lifting frame fixedly connected with the upper surface of the sampling box, and a screw rod is rotatably connected between the top and the bottom of the lifting frame. According to the tear resistance detection device for the plastic film, the edge of the film is physically blocked by the limiting disc, so that a sample strip can be prevented from deviating in the testing process and the sample strip mounting process, the perpendicularity of the sample strip between the two fixing assemblies is ensured, the subsequent stress uniformity is ensured, and the accuracy of a detection result is improved; the sawtooth structure on the surface of the fixing column and the arc-shaped groove of the matching block form occlusion type clamping, the anti-slipping capacity is improved, the two ends of the sample strip are prevented from being disengaged in the detection process, the detection stability is improved, manual pressing type film cutting can be achieved through the pressing rod and the blade, or the lifting plate is in linkage with the downward pressing shaft to achieve automatic film cutting, and the detection efficiency is improved. The rapid sampling requirement is met, and the convenience of a user is improved.

Description

Technical Field

[0001] This utility model relates to the field of film testing technology, specifically a device for testing the tear resistance of plastic films. Background Technology

[0002] Plastic films are made of polyvinyl chloride, polyethylene, polypropylene, polystyrene, and other resins, and are used for packaging and as a coating layer.

[0003] An existing patent (publication number: CN222529110U) discloses a plastic film tear resistance testing device, including a work cabinet. A fixed plate is fixedly connected to the top of the work cabinet. First screws are fixedly connected to the left and right sides of the bottom of the fixed plate. Second connecting rods are fixedly connected to the bottom of each of the two first screws. Second screws are fixedly connected to the bottom of each of the two second connecting rods. First bevel gears are fixedly connected to the bottom of each of the two second screws. In this invention, by simultaneously driving two second motors, the first and second clamping plates clamp the film tightly, increasing the contact area between the film and the first and second clamping plates to prevent the film from falling off. The indicator points to the zero mark on the scale. The driving assembly performs a vertical tear test on the film. When the film tears and the driving assembly stops, the indicator points to the maximum tensile force that the film can withstand.

[0004] The device clamps the film with the first and second clamps to increase the contact area between the film and the first and second clamps and prevent the film from falling off. However, during the clamping process, the film is prone to tilting, which makes the tension on the film uneven and affects the subsequent detection effect. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a plastic film tear resistance testing device, which has advantages such as automatic sample cutting and uniform force application, thus solving the problems mentioned in the background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a plastic film tear resistance testing device, comprising a sampling box and a lifting frame fixedly connected to the upper surface of the sampling box, a lead screw rotatably connected between the top and bottom of the lifting frame, a lifting plate threadedly connected to the outer surface of the lead screw, a tension sensor fixedly installed at the bottom front end of the lifting plate, and fixing components installed at the detection end of the tension sensor and the bottom of the lifting frame.

[0007] Each of the aforementioned fixing components includes a fixing plate, and a threaded rod is rotatably connected between the front and rear inner sidewalls of the two fixing plates. A movable plate is threadedly connected to the outer surface of each threaded rod. A set of L-shaped rods is fixedly connected to the side of the two movable plates that are close to each other. A fixing post is fixedly connected between each set of L-shaped rods. A limit plate is fixedly connected to both ends of the two fixing posts. A mating block is fixedly connected to the side of the two fixing plates that are close to each other. The end of the mating block near the fixing post is provided with an arc-shaped groove that matches the fixing post.

[0008] Furthermore, two pressure rods are slidably inserted into the front and rear ends of the sampling box. The bottom ends of the two pressure rods are fixedly connected to the same cutting plate. The bottom of the cutting plate is fixedly connected to a set of linearly arranged blades. The top ends of the two pressure rods are fixedly connected to the same pressure plate. Two compression springs are installed between the pressure plate and the sampling box. Each compression spring is sleeved with the pressure rod closest to it. A set of knife grooves is opened on the inner bottom wall of the sampling box.

[0009] By placing the film sheet into the inner bottom wall of the sampling box and then manually pressing the pressure plate to move the cutting plate and blade downwards, the film can be cut quickly, improving its overall practicality.

[0010] Furthermore, a pressure shaft is fixedly connected to the bottom rear end of the lifting plate, and the pressure shaft is located above the pressure plate.

[0011] The above method can also achieve automatic cutting of film sheets by using a lead screw to drive the lifting plate and the downward pressing shaft to move downward.

[0012] Furthermore, a motor is installed at the top of the lifting frame, and the output end of the motor is fixedly connected to the top of the lead screw.

[0013] The above solution, through the setting of the motor, can provide power for the rotation of the lead screw, thereby realizing the up and down movement of the lifting plate.

[0014] Furthermore, the distance between two adjacent blades is equal to the length of the fixed post.

[0015] The above method can achieve the same width as the length of the fixed column, and with the guidance and limiting of the limiting plate, improve the verticality of the film strip installation.

[0016] Furthermore, the outer surfaces of the two fixed posts are serrated in a circular pattern.

[0017] The above method can improve the fixation stability and prevent the specimen from falling off during tensile testing.

[0018] Furthermore, the lifting frame is provided with reinforcing ribs on both sides of its bottom end.

[0019] The above solutions can improve the stability of the lifting frame.

[0020] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0021] This plastic film tear resistance testing device uses a limiting plate to physically block the film edge, preventing the sample from shifting during testing and installation, ensuring the perpendicularity of the sample between the two fixed components, ensuring uniform subsequent force distribution, and improving the accuracy of the test results. Secondly, the serrated structure on the surface of the fixed column and the arc groove of the mating block form an interlocking clamping action, improving anti-slip capability and preventing the ends of the sample from detaching during testing, thus improving testing stability. The device can achieve manual pressing and cutting of the film sheet through the set pressure rod and blade, or automatic cutting of the film sheet can be achieved by lifting the plate and pressing down the shaft, meeting the needs of rapid sampling and improving user convenience. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this application;

[0023] Figure 2 This is a front view of the overall structure of this application;

[0024] Figure 3 This is a side view of the fixed component structure of this application;

[0025] Figure 4 For this application Figure 3 A three-dimensional schematic diagram;

[0026] Figure 5 This is a structural diagram of the cutting plate in this application.

[0027] In the picture:

[0028] 1. Sampling box; 2. Lifting frame; 3. Lead screw; 4. Lifting plate; 5. Tension sensor;

[0029] 6. Fixing components; 601. Fixing plate; 602. Threaded rod; 603. Moving plate; 604. L-shaped rod; 605. Fixing column; 606. Limiting plate; 607. Mating block;

[0030] 7. Pressure bar; 8. Cutting plate; 9. Blade; 10. Pressure plate; 11. Compression spring; 12. Blade groove; 13. Lower pressure shaft; 14. Motor; 15. Reinforcing rib. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] Please see Figure 1 , Figure 2 and Figure 3 This embodiment of a plastic film tear resistance testing device includes a sampling box 1 and a lifting frame 2 fixedly connected to the upper surface of the sampling box 1. A lead screw 3 is rotatably connected between the top and bottom of the lifting frame 2. A lifting plate 4 is threadedly connected to the outer surface of the lead screw 3. A tension sensor 5 is fixedly installed at the bottom front end of the lifting plate 4. Fixing components 6 are installed at the detection end of the tension sensor 5 and the bottom of the lifting frame 2. A motor 14 is installed at the top of the lifting frame 2. The output end of the motor 14 is fixedly connected to the top of the lead screw 3. The motor 14 can provide power for the rotation of the lead screw 3, thereby realizing the up and down movement of the lifting plate 4. Reinforcing ribs 15 are provided on both sides of the bottom end of the lifting frame 2. The stability of the lifting frame 2 can be improved by the reinforcing ribs 15.

[0033] Please see Figure 1 , Figure 3 and Figure 4 Each fixing component 6 includes a fixing plate 601. A threaded rod 602 is rotatably connected between the front and rear inner sidewalls of the two fixing plates 601. A movable plate 603 is threadedly connected to the outer surface of each threaded rod 602. A set of L-shaped rods 604 are fixedly connected to the side of the two movable plates 603 that are close to each other. A fixing post 605 is fixedly connected between each set of L-shaped rods 604. Limiting discs 606 are fixedly connected to both ends of the two fixing posts 605. A mating block 607 is fixedly connected to the side of the two fixing plates 601 that are close to each other. The end of the mating block 607 near the fixing post 605 is provided with a mating block 607 that engages with the fixing post 605. The 05-phase matching arc groove, by rotating the threaded rod 602, can move the fixed post 605 towards or away from the mating block 607, thereby clamping the film between the mating block 607 and the fixed post 605, achieving the purpose of fixing both ends of the film. The set limiting plate 606 can limit the two sides of the film, effectively preventing the film from tilting and folding when clamping, ensuring the test effect. The outer surfaces of the two fixed posts 605 are circumferentially arranged serrated. The serrated setting of the outer surface of the fixed posts 605 can improve the fixing stability and prevent the sample from falling off during the tensile test.

[0034] Please see Figure 1 , Figure 2 and Figure 5The sampling box 1 has two pressure rods 7 that slide vertically and vertically at its front and rear ends. The bottom ends of the two pressure rods 7 are fixedly connected to the same cutting plate 8. The bottom of the cutting plate 8 is fixedly connected to a set of linearly arranged blades 9. The top ends of the two pressure rods 7 are fixedly connected to the same pressure plate 10. Two compression springs 11 are installed between the pressure plate 10 and the sampling box 1. Each compression spring 11 is sleeved with the pressure rod 7 that is close to it. The inner bottom wall of the sampling box 1 has a set of knife grooves 12. By placing the film sheet into the inner bottom wall of the sampling box 1 and then manually pressing the pressure plate 10 to drive the cutting plate 8 and blades 9 to move downward, the film can be quickly cut, improving the overall practicality. The bottom of the rear end of the lifting plate 4 is fixedly connected to a lower pressure shaft 13. The lower pressure shaft 13 is located above the pressure plate 10. The lifting plate 4 and the lower pressure shaft 13 are driven downward by the lead screw 3, which can also realize the automatic cutting of the film sheet.

[0035] Please see Figure 1 , Figure 2 and Figure 5 The distance between two close blades 9 is equal to the length of the fixed post 605. With the above settings, the width of the film strip can be equal to the length of the fixed post 605. Combined with the guide and limit of the limiting plate 606, the verticality of the film strip installation is improved.

[0036] This embodiment of a plastic film tear resistance testing device uses a limiting disc 606 to physically block the edge of the film, preventing the sample from shifting during testing and installation, ensuring the perpendicularity of the sample between the two fixing components 6, ensuring uniform force distribution, and improving the accuracy of the test results. Secondly, the serrated structure on the surface of the fixing column 605 and the arc groove of the mating block 607 form an interlocking clamping action, improving anti-slip capability, preventing the ends of the sample from separating during testing, and improving testing stability. The pressure rod 7 and the blade 9 enable manual pressing and cutting of the film sheet, or automatic cutting of the film sheet can be achieved by the lifting plate 4 in conjunction with the lowering shaft 13, meeting the needs of rapid sampling and improving user convenience.

[0037] The working principle of the above embodiment is as follows: The operator lays the entire plastic film flat on the bottom wall of the sampling box 1, manually presses the pressure plate 10, or the motor 14 drives the lead screw 3 to drive the lifting plate 4 to press down the extrusion rod 7, so that the linearly arranged blades 9 of the cutting plate 8 penetrate the film and complete the standardized strip cutting. The spacing of the blades 9 is designed to match the length of the fixed column 605 to ensure that the strip width is adapted to the clamping area, laying the foundation for subsequent vertical clamping. Rotating the threaded rod 602 of the fixing component 6 drives the moving plate 603 along the L-shape. As rod 604 moves horizontally, the serrated fixing post 605 moves towards the arc groove of mating block 607. The limiting plate 606 physically limits the two sides of the sample to prevent lateral displacement. When the fixing post 605 engages with the arc groove of mating block 607, the two ends of the sample are clamped. Motor 14 drives lead screw 3 to rotate, causing lifting plate 4 to move at a constant speed in the vertical direction. Fixing component 6 moves upward with lifting plate 4, generating tensile displacement. Tension sensor 5 records the tension, completing the test of the sample.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tear resistance testing device for plastic film, comprising a sampling box (1) and a lifting frame (2) fixedly connected to the upper surface of the sampling box (1), characterized in that: A lead screw (3) is rotatably connected between the top and bottom of the lifting frame (2). A lifting plate (4) is threadedly connected to the outer surface of the lead screw (3). A tension sensor (5) is fixedly installed at the bottom front end of the lifting plate (4). Fixing components (6) are installed at the detection end of the tension sensor (5) and the bottom of the lifting frame (2). Each of the fixing components (6) includes a fixing plate (601), and a threaded rod (602) is rotatably connected between the front and rear inner sidewalls of the two fixing plates (601). A movable plate (603) is threadedly connected to the outer surface of each threaded rod (602). A set of L-shaped rods (604) is fixedly connected to the side of the two movable plates (603) that are close to each other. A fixing post (605) is fixedly connected between each set of L-shaped rods (604). Limiting plates (606) are fixedly connected to both ends of the two fixing posts (605). A mating block (607) is fixedly connected to the side of the two fixing plates (601) that are close to each other. An arc-shaped groove adapted to the fixing post (605) is provided at the end of the mating block (607) near the fixing post (605).

2. The tear resistance testing device for plastic film according to claim 1, characterized in that: The sampling box (1) has two pressure rods (7) that slide vertically and vertically at the front and rear ends. The bottom ends of the two pressure rods (7) are fixedly connected to the same cutting plate (8). The bottom of the cutting plate (8) is fixedly connected to a set of linearly arranged blades (9). The top ends of the two pressure rods (7) are fixedly connected to the same pressure plate (10). Two compression springs (11) are installed between the pressure plate (10) and the sampling box (1). Each compression spring (11) is sleeved with the pressure rod (7) that is close to it. A set of knife grooves (12) are opened on the inner bottom wall of the sampling box (1).

3. The tear resistance testing device for plastic film according to claim 2, characterized in that: The bottom rear end of the lifting plate (4) is fixedly connected to a pressing shaft (13), which is located above the pressure plate (10).

4. The tear resistance testing device for plastic film according to claim 1, characterized in that: The top of the lifting frame (2) is equipped with a motor (14), and the output end of the motor (14) is fixedly connected to the top of the lead screw (3).

5. The tear resistance testing device for plastic film according to claim 2, characterized in that: The distance between two adjacent blades (9) is equal to the length of the fixed post (605).

6. The tear resistance testing device for plastic film according to claim 1, characterized in that: The outer surfaces of the two fixed posts (605) are serrated in a circular pattern.

7. The tear resistance testing device for plastic film according to claim 1, characterized in that: The lifting frame (2) is provided with reinforcing ribs (15) on both sides of its bottom end.

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