TPU film tension detection device

Abstract

The utility model discloses a TPU (thermoplastic polyurethane) film tension detection device, which belongs to the technical field of tension detection, and comprises two pressing assemblies and a clamping assembly, each pressing assembly comprises a fixed block and two pressing blocks, the inner side of each fixed block is provided with two inclined surfaces, the two pressing blocks are driven by the inclined surfaces to get close to each other, and the two pressing blocks are clamped by the clamping assembly. The clamping assemblies are arranged at the outer ends of the abutting blocks, the two abutting blocks can be close to each other through pulling of the threaded rods and matching of the inclined faces, at the moment, the two pressurizing air bags are squeezed to be compressed, the clamping air bags communicated with the pressurizing air bags are inflated to expand, the thin film is placed between the two clamping air bags, and then the thin film is clamped. When the thin film is clamped, the expanded clamping air bag extrudes the thin film so as to clamp and fix the thin film, and due to the characteristics of softness and large friction force of the clamping assembly, the surface of the thin film is not easy to deform when the thin film is clamped with force, so that the reliability of experimental data is improved.

Description

Technical Field

[0001] This utility model relates to the field of tensile testing technology, and more specifically, to a TPU film tensile testing device. Background Technology

[0002] TPU film (thermoplastic polyurethane film) is a flexible, highly elastic film made of thermoplastic polyurethane (TPU) material. It has excellent physical and chemical properties and is widely used in industrial, medical, and consumer products fields. Tensile testing equipment is an experimental device used to test the mechanical properties of TPU film, mainly used to measure its tensile strength, elongation at break, elastic modulus, tear strength and other key parameters.

[0003] Chinese Patent Announcement No. CN216955492U provides a thin film tensile testing device. When the upper clamp of the tensile testing instrument malfunctions and collides with the mechanical limit switch set at the limit position, the mechanical limit switch can immediately disconnect the power supply circuit of the tensile testing instrument, de-energize the linear drive mechanism of the tensile testing instrument, and stop driving the upper clamp to move. This avoids collision between the upper clamp of the tensile testing instrument and the support column, which could lead to equipment damage and ensure the safety of the thin film tensile test.

[0004] Because the surface of TPU film is relatively smooth, the above-mentioned methods and traditional metal clamps are prone to slippage between the TPU film and the clamp during clamping and stretching, which can cause fluctuations in experimental data. If the clamping is too tight, the surface of the film can be deformed, thereby reducing the reliability of the experimental data.

[0005] Therefore, a TPU film tensile strength testing device is proposed to address the above problems. Utility Model Content

[0006] This invention provides a TPU film tensile testing device, which can improve the problems existing in related technologies: TPU film is prone to slippage between itself and the clamp, which causes fluctuations in experimental data. If the clamp is too tight, the surface of the film is prone to deformation, thereby reducing the reliability of experimental data.

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] This application provides a TPU film tensile strength testing device, comprising: two pressing components and a clamping component. The pressing components include a fixed block and two pressing blocks. The fixed block has two inclined surfaces on its inner side. The two pressing blocks are driven to move closer to each other through the inclined surfaces. The clamping component is disposed at the outer end of the pressing blocks. The clamping component includes a clamping airbag and a pressurizing airbag. The thickness of the pressurizing airbag is greater than the thickness of the clamping airbag. The clamping airbag and the pressurizing airbag are internally connected. The two pressing blocks move closer to each other and squeeze the pressurizing airbag. The pressurizing airbag is compressed, causing the clamping airbag to inflate and clamp the TPU film.

[0009] The technical solutions described in this application embodiment have at least the following technical effects:

[0010] By pulling the threaded rod and engaging the inclined plane, the two pressure blocks can approach each other. At this time, the two pressurized airbags are compressed by mutual pressure, causing the clamping airbags connected to them to be inflated. When the film is placed between the two clamping airbags, the inflated clamping airbags will compress the film and clamp it in place. Due to the relatively soft nature of the clamping components and the high friction, the surface of the film is not easily deformed when it is clamped, thereby improving the reliability of the experimental data.

[0011] In some embodiments, the TPU film tensile testing device further includes: a mounting platform, a fixed base fixedly mounted on the top of the mounting platform, a crossbeam mounted on the outer end of the mounting platform, a tensile sensor mounted on the outer end of the crossbeam, two pressure-absorbing components respectively mounted on the outer ends of the tensile sensor and the fixed base, the tensile sensor driving one of the pressure-absorbing components to move up and down via the crossbeam, a servo motor mounted on the bottom of the mounting platform, the output end of the servo motor connected to a drive device via a speed change device, a threaded sleeve adapted to the drive device mounted on the outer end of the crossbeam, and the crossbeam being driven by the drive device via the threaded sleeve.

[0012] In some embodiments, the pressing assembly further includes a threaded rod that is threadedly connected to the fixing block, one end of which is fixedly connected to a locking pin, and two mounting brackets are fixedly installed at the bottom of the fixing block.

[0013] In some embodiments, the pressing block includes a clamping block, the bottom of which has a slot, and the threaded rod drives the clamping block to move through the slot via the locking pin. A slider is fixedly installed at the outer end of the clamping block, and a sliding groove is provided at the outer end of the inclined surface. The slider is slidably connected to the sliding groove.

[0014] In some embodiments, the outer end of the clamping block is provided with a first groove and a second groove, and the first groove and the second groove are connected.

[0015] In some embodiments, the outer end of the clamping airbag is equipped with an anti-slip pad for increasing friction, the outer end of the pressurizing airbag is equipped with an abutment plate, the inner side of the pressurizing airbag is equipped with a reinforcing grid, the inner side of the clamping airbag is equipped with a reset member, and the clamping airbag and the pressurizing airbag are respectively installed inside the second groove and the first groove.

[0016] In some embodiments, the reset member includes two movable frames, both of which are fixedly installed inside the clamping airbag. Two telescopic springs are installed between the two movable frames. A slide rod is installed at the outer end of one movable frame, and a slide is installed at the outer end of the other movable frame. The slide rod is slidably connected to the slide. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the installation structure of the pressure-resistant component of this utility model;

[0019] Figure 3 This is a schematic diagram of the exploded structure of the pressure-resistant component of this utility model;

[0020] Figure 4 This is a schematic diagram of the pressing block structure of this utility model;

[0021] Figure 5 This is a cross-sectional view of the clamping assembly of this utility model;

[0022] Figure 6 This is a schematic diagram of the resetting component structure of this utility model.

[0023] Explanation of the labels in the diagram:

[0024] 1. Mounting platform;

[0025] 2. Servo motor;

[0026] 3. Drive unit;

[0027] 4. Crossbeam;

[0028] 5. Tension sensor;

[0029] 6. Fixture;

[0030] 7. Pressing component; 71. Fixing block; 72. Mounting bracket; 73. Threaded rod; 74. Clamping post; 75. Slide groove; 76. Inclined surface; 77. Pressing block; 771. Clamping block; 772. Sliding block; 773. Groove one; 774. Groove two; 775. Slot;

[0031] 8. Clamping assembly; 81. Clamping airbag; 82. Anti-slip pad; 83. Pressurized airbag; 84. Abutment plate; 85. Reinforcing grid; 86. Reset component; 861. Movable frame; 862. Slide rod; 863. Slide carriage; 864. Telescopic spring. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0033] When performing tensile testing on TPU film, it needs to be cut into strips of uniform size first. Then, both ends of the strip can be clamped onto two fixtures. However, traditionally, metal fixtures are used for clamping. Since the surfaces of both the TPU film and the fixtures are relatively smooth, if the clamping is not tight enough, the film is prone to slipping during the stretching process, causing abnormal fluctuations in the tensile analysis curve and affecting the experimental data. If the clamping is too tight, the film is prone to deformation, thereby reducing the reliability of the experimental data.

[0034] Please see Figure 1 - Figure 6 A TPU film tensile strength testing device includes: two pressing components 7 and a clamping component 8. The pressing component 7 includes a fixing block 71 and two pressing blocks 77. Two inclined surfaces 76 are provided on the inner side of the fixing block 71. The two pressing blocks 77 are driven to move closer to each other through the inclined surfaces 76. The clamping component 8 is provided at the outer end of the pressing block 77. The clamping component 8 includes a clamping airbag 81 and a pressurizing airbag 83. The thickness of the pressurizing airbag 83 is greater than the thickness of the clamping airbag 81. The clamping airbag 81 and the pressurizing airbag 83 are internally connected. The two pressing blocks 77 move closer to each other and squeeze the pressurizing airbag 83. The pressurizing airbag 83 is compressed, causing the clamping airbag 81 to inflate and clamp the TPU film.

[0035] The TPU film tensile testing device also includes: a mounting platform 1, a fixed base 6 fixedly mounted on the top of the mounting platform 1, a crossbeam 4 mounted on the outer end of the mounting platform 1, a tensile sensor 5 mounted on the outer end of the crossbeam 4, two pressure-resistant components 7 respectively mounted on the outer ends of the tensile sensor 5 and the fixed base 6, the tensile sensor 5 drives one of the pressure-resistant components 7 to move up and down through the crossbeam 4, a servo motor 2 mounted on the bottom of the mounting platform 1, the output end of the servo motor 2 is connected to a drive device 3 through a speed change device, a screw sleeve adapted to the drive device 3 is mounted on the outer end of the crossbeam 4, and the crossbeam 4 is driven by the drive device 3 through the screw sleeve.

[0036] A servo motor 2 is installed at the bottom of the mounting platform 1, and a fixed base 6 is fixedly installed at the top of the mounting platform 1. Two vertically installed slide rails are set at the outer end of the mounting platform 1, and the crossbeam 4 is slidably connected to the two slide rails. At the same time, a threaded sleeve is installed at the outer end of the crossbeam 4. A speed change device is installed at the output end of the servo motor 2. The speed change device consists of multi-stage reduction gears. By meshing with each other, the speed of the servo motor 2 is reduced and the torque is increased. The output end of the speed change device is connected to the drive device 3. The drive device 3 is mainly composed of a screw. The screw on the drive device 3 is threadedly connected to the threaded sleeve on the crossbeam 4, thereby driving the crossbeam 4 to move up and down.

[0037] A tension sensor 5 is installed at the outer end of the crossbeam 4. The tension sensor 5 is mainly used to measure the value of the tension. It is connected to an external computer to record and analyze the generated tension. This technology is existing technology. A pressure-blocking component 7 is installed on both the tension sensor 5 and the fixed base 6. The pressure-blocking component 7 installed on the fixed base 6 cannot move, while the pressure-blocking component 7 installed on the tension sensor 5 can move up and down with it to stretch the film sandwiched in the middle.

[0038] By pulling the threaded rod 73 and engaging the inclined plane 76, the two pressure blocks 77 can approach each other. At this time, the two pressurized airbags 83 are compressed by mutual pressure, causing the clamping airbag 81 connected to them to be inflated. When the film is placed between the two clamping airbags 81, the inflated clamping airbags 81 will compress the film and clamp it in place. Due to the relatively soft and high frictional properties of the clamping component 8, the surface of the film is not easily deformed when it is clamped, thereby improving the reliability of the experimental data.

[0039] Please see Figure 2 - Figure 4 The pressing component 7 also includes a threaded rod 73, which is threadedly connected to the fixing block 71. One end of the threaded rod 73 is fixedly connected to a locking post 74, and two mounting brackets 72 are fixedly installed at the bottom of the fixing block 71.

[0040] The pressing block 77 includes a clamping block 771. The bottom of the clamping block 771 has a slot 775. The threaded rod 73 moves the clamping block 771 by cooperating with the slot 775 through the locking pin 74. A slider 772 is fixedly installed on the outer end of the clamping block 771. A sliding groove 75 is opened on the outer end of the inclined surface 76. The slider 772 is slidably connected to the sliding groove 75.

[0041] The outer end of the clamping block 771 is provided with groove 1 773 and groove 2 774 respectively, and groove 1 773 and groove 2 774 are connected.

[0042] In this design, the fixing block 71 has two mounting brackets 72 fixed at its bottom. The mounting brackets 72 allow the fixing block 71 to be mounted on the fixing base 6 and the tension sensor 5 respectively. Two symmetrical inclined surfaces 76 are formed on the inner side of the fixing block 71, and grooves 75 are formed on both inclined surfaces 76. A threaded hole is formed at the outer end of the fixing block 71, and a threaded rod 73 is threadedly connected to the threaded hole. A locking pin 74 is fixed at one end of the threaded rod 73. The pressing block 77 is mainly composed of a clamping block 771 and a slider 772. The clamping block 771 is slidably connected to the groove 75 on the inclined surface 76 through the slider 772. A locking groove 775 is formed at the outer end of the clamping block 771, and the locking groove 775 is adapted to the locking pin 74 on the threaded rod 73. When the locking pin 74 is inserted into the inner side of the locking groove 775 between the two clamping blocks 771, the clamping block 771 can be locked. At this time, by rotating the threaded rod 73, the two clamping blocks 771 can be moved simultaneously through the locking pin 74.

[0043] Grooves 773 and 774 are provided at the outer end of clamping block 771. Grooves 773 and 774 are connected. Grooves 773 and 774 are mainly used to install clamping components 8. When the two clamping blocks 771 move upward at the same time, they can be brought closer to each other by the restriction of inclined surface 76. At this time, the two clamping components 8 will be squeezed.

[0044] Please see Figure 5 and Figure 6 An anti-slip pad 82 for increasing friction is installed on the outer end of the clamping airbag 81, an abutment plate 84 is installed on the outer end of the pressurized airbag 83, a reinforcing grid 85 is installed on the inner side of the pressurized airbag 83, and a reset piece 86 is installed on the inner side of the clamping airbag 81. The clamping airbag 81 and the pressurized airbag 83 are respectively installed on the inner sides of the second groove 774 and the first groove 773.

[0045] The reset component 86 includes two movable frames 861, both of which are fixedly installed inside the clamping airbag 81. Two telescopic springs 864 are installed between the two movable frames 861. A slide rod 862 is installed at the outer end of one movable frame 861, and a slide 863 is installed at the outer end of the other movable frame 861. The slide rod 862 and the slide 863 are slidably connected.

[0046] In this design, the clamping airbag 81 and the pressurizing airbag 83 are interconnected. Multiple anti-slip pads 82, made of silicone, are fixed to the outer end of the clamping airbag 81 to increase friction. The abutment plate 84, fixed to the outer end of the pressurizing airbag 83, ensures that the pressurizing airbag 83 is compressed evenly inward when subjected to pressure. Both the abutment plate 84 and the anti-slip pads 82 are fixed with adhesive. The thickness of the pressurizing airbag 83 is greater than that of the clamping airbag 81, allowing the pressurizing airbag 83 to abut against each other and be compressed when the two abutment blocks 77 approach each other.

[0047] Inside the pressurized airbag 83, a reinforcing grid 85 is fixed. The reinforcing grid 85 is mainly composed of multiple interwoven rubber strips. By reinforcing the inside of the pressurized airbag 83 through the reinforcing grid 85, the surface can be kept flat when the pressurized airbag 83 expands outward, preventing excessive local expansion of its surface and improving the uniformity of clamping.

[0048] Inside the clamping airbag 81, a reset component 86 is installed. Two movable frames 861 in the reset component 86 are fixed to the inside sides of the clamping airbag 81 respectively. Two telescopic springs 864 fixed between the two movable frames 861 are used for reset. At the same time, multiple sliding rods 862 and sliding frames 863 are fixed on the two movable frames 861 respectively. The sliding rods 862 and sliding frames 863 are slidably connected to guide and strengthen the movable frame 861.

[0049] When the two pressing blocks 77 approach each other, the clamping airbags 81 bulge outwards, causing the abutment plates 84 on the two clamping airbags 81 to abut against each other, thereby compressing the pressurized airbag 83. The gas inside the pressurized airbag 83 then rushes into the clamping airbag 81, causing the clamping airbag 81 to expand and bulge outwards. At this time, the membrane located between the two clamping airbags 81 is clamped by the two sets of anti-slip pads 82 on it and fixed by friction. Due to the softness of the clamping airbags 81 and the anti-slip pads 82, a large clamping force can be applied without damaging the surface of the membrane.

[0050] When released, the force of the telescopic spring 864 can move the two movable frames 861 away from each other. At this time, the clamping airbag 81, which is reset by the reset member 86, will draw back the gas inside the pressurized airbag 83, thereby restoring it to its original state.

[0051] Working principle: When using this device to test the tensile strength of TPU film, the cut film is first clamped on two pressing components 7. Rotating the threaded rod 73 will cause the two clamping blocks 771 to move simultaneously through the clamping post 74. The inclined plane 76 restricts them to move closer to each other. At this time, the two clamping components 8 will be squeezed, and the abutment plates 84 on the two clamping airbags 81 will abut against each other to compress the pressurized airbags 83. The gas in the pressurized airbags 83 will rush into the clamping airbags 81, causing them to expand and bulge outward. At this time, the film located between the two clamping airbags 81 will be clamped by the two sets of anti-slip pads 82 on them and fixed by friction.

Claims

1. A TPU film tensile strength testing device, characterized in that, include: Two pressing components (7) are provided, each including a fixed block (71) and two pressing blocks (77). The fixed block (71) has two inclined surfaces (76) on its inner side. The two pressing blocks (77) are driven to move closer to each other through the inclined surfaces (76). A clamping assembly (8) is disposed at the outer end of the pressing block (77). The clamping assembly (8) includes a clamping airbag (81) and a pressurizing airbag (83). The thickness of the pressurizing airbag (83) is greater than the thickness of the clamping airbag (81). The clamping airbag (81) and the pressurizing airbag (83) are internally connected. In this process, the two pressure blocks (77) approach each other and squeeze the pressurized airbag (83). The pressurized airbag (83) is compressed, causing the clamping airbag (81) to inflate and clamp the TPU film.

2. The TPU film tensile strength testing device according to claim 1, characterized in that, The TPU film tensile strength testing device also includes: Mounting platform (1), a fixed seat (6) is fixedly installed on the top of the mounting platform (1), a crossbeam (4) is installed on the outer end of the mounting platform (1), and a tension sensor (5) is installed on the outer end of the crossbeam (4). The two pressure-blocking components (7) are respectively installed on the outer ends of the tension sensor (5) and the fixed base (6). The tension sensor (5) drives one of the pressure-blocking components (7) to move up and down through the crossbeam (4). The mounting platform (1) is equipped with a servo motor (2) at its bottom. The output end of the servo motor (2) is connected to a drive device (3) through a speed change device. The outer end of the crossbeam (4) is equipped with a screw sleeve that is compatible with the drive device (3). The crossbeam (4) is driven by the drive device (3) through the screw sleeve.

3. The TPU film tensile strength testing device according to claim 1, characterized in that: The pressing component (7) also includes a threaded rod (73), which is threadedly connected to the fixing block (71). One end of the threaded rod (73) is fixedly connected to a locking post (74), and two mounting brackets (72) are fixedly installed at the bottom of the fixing block (71).

4. The TPU film tensile strength testing device according to claim 3, characterized in that: The pressing block (77) includes a clamping block (771), the bottom of the clamping block (771) is provided with a slot (775), the threaded rod (73) drives the clamping block (771) to move through the slot (775) via the locking post (74), a slider (772) is fixedly installed on the outer end of the clamping block (771), and a sliding groove (75) is provided on the outer end of the inclined surface (76), the slider (772) is slidably connected to the sliding groove (75).

5. The TPU film tensile strength testing device according to claim 4, characterized in that: The outer end of the clamping block (771) is provided with groove one (773) and groove two (774), and groove one (773) and groove two (774) are connected.

6. The TPU film tensile strength testing device according to claim 5, characterized in that: The clamping airbag (81) is equipped with an anti-slip pad (82) for increasing friction at its outer end, the pressurizing airbag (83) is equipped with an abutment plate (84) at its outer end, the pressurizing airbag (83) is equipped with a reinforcing grid (85) on its inner side, and the clamping airbag (81) is equipped with a reset member (86) on its inner side. The clamping airbag (81) and the pressurizing airbag (83) are respectively installed on the inner side of the second groove (774) and the first groove (773).

7. The TPU film tensile strength testing device according to claim 6, characterized in that: The reset component (86) includes two movable frames (861), both of which are fixedly installed inside the clamping airbag (81). Two telescopic springs (864) are installed between the two movable frames (861). A slide rod (862) is installed at the outer end of one of the movable frames (861), and a slide frame (863) is installed at the outer end of the other movable frame (861). The slide rod (862) and the slide frame (863) are slidably connected.

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