A tensile testing apparatus for plastic articles

Abstract

The utility model relates to plastic product technical field especially relates to a kind of plastic product tension testing equipment, including bottom plate, support plate is parallelly arranged above the bottom plate, the both ends of support plate are fixed with bottom plate by support frame, two oppositely arranged clamps are provided between support plate and bottom plate;Clamp includes support seat, support seat is located above support plate, and fixed frame is installed at the top of support seat, the top of fixed frame is installed with U-shaped frame, the opening of two U-shaped frames is oppositely arranged, second two-way screw rod is provided in U-shaped frame, and the end of second two-way screw rod is rotatably connected with U-shaped frame.The utility model is through the structure that the slotting of upper and lower clamps is staggered and the built-in pressing plate, can carry out multi-point staggered extrusion to plastic product (especially the material of relatively soft texture), effectively prevent the damage caused by sample slippage or local stress concentration in testing process, improve the stability and adaptability of clamping.

Description

Technical Field

[0001] This utility model relates to the field of plastic products technology, and in particular to a tensile testing device for plastic products. Background Technology

[0002] Plastic products are made from plastics, which are resins (such as polyethylene, polypropylene, etc.) with additives added and then molded by heating. Common types of plastics include polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC).

[0003] After plastic products are manufactured, various sampling tests are required to ensure they meet specifications. Tensile testing is one of the commonly used tests. In tensile testing, the two ends of the plastic product are placed on clamps, and then pulled to both sides to apply tension until the product is damaged. The maximum force measured at this point is the maximum tensile force the plastic product can withstand. However, when clamping the plastic product, the clamps themselves also apply force. Since the texture of plastic products varies depending on their material composition (softer or harder), excessive force can easily damage the product when using clamps for fixation. This is especially true for softer plastic products, where the clamps can easily slip during pulling, affecting the tensile test results. Therefore, we propose a tensile testing device for plastic products. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned shortcomings in the existing technology by providing a tensile testing device for plastic products.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a tensile testing device for plastic products, including a base plate, a support plate arranged parallel above the base plate, both ends of the support plate being fixed to the base plate by a support frame, and two opposing clamps being arranged between the support plate and the base plate. The fixture includes a support base located above a support plate, and a fixing frame installed on the top of the support base. A U-shaped frame is installed on the top of the fixing frame, with the openings of the two U-shaped frames facing each other. A second bidirectional lead screw is provided inside the U-shaped frame, and the end of the second bidirectional lead screw is rotatably connected to the U-shaped frame. A second drive motor is installed on the top of the second bidirectional lead screw and is fixed on the U-shaped frame. Strip-shaped clamps are provided at both ends of the second bidirectional lead screw, and one end of the clamp is threaded to the second bidirectional lead screw through a nut. Several slots are arranged at intervals on the other end of the clamping plate. The slots of the upper and lower clamping plates are staggered. One end of the slot penetrates the side of the clamping plate, and a pressure plate is placed inside the slot. The pressure plate is perpendicular to the clamping plate, and two limiting plates are vertically installed on the end of the pressure plate. The two limiting plates are arranged on both sides of the clamping plate.

[0006] Preferably, at least one guide shaft is provided parallel to the side of the second bidirectional lead screw, the guide shaft slides through the clamping plate, and the end of the guide shaft is fixed to the inner wall of the U-shaped frame.

[0007] Preferably, a control box is provided on one side above the base plate, and a controller is provided inside the control box. The controller is connected to the second drive motor through wires.

[0008] Preferably, an elastic rope is provided between the two fixed frames, one end of which is equipped with a pressure sensor. The pressure sensor is installed on one of the fixed frames, while the other end of the elastic rope is fixed to the other fixed frame. The pressure sensor is connected to the controller via a wire.

[0009] Preferably, a strip groove is provided at both ends of the support plate, and a first bidirectional lead screw is provided between the support plate and the base plate. The first bidirectional lead screw corresponds to the strip groove, and the end of the first bidirectional lead screw is rotatably connected to the support frame. A first drive motor is installed on one end of the first bidirectional lead screw. The first drive motor is fixed on the support frame and is connected to the controller through a wire. Movable seats are connected to both ends of the first bidirectional lead screw through threaded nuts. A connecting seat is installed on the top of the movable seat. The connecting seat passes through the strip groove and is connected to the support seat.

[0010] Preferably, the side of the connecting seat is clearance-fitted with the inner wall of the strip groove, and the bottom of the support seat is clearance-fitted with the top surface of the support plate.

[0011] Preferably, mounting holes are provided at all corners of the base plate.

[0012] The design scheme proposed in this utility model has the following beneficial effects in application: 1. This utility model, through the staggered slotting arrangement of the upper and lower clamping plates and the structure of the built-in pressure plate, can perform multi-point staggered extrusion on plastic products (especially softer materials), effectively preventing sample slippage or damage caused by local stress concentration during the test, and improving the stability and adaptability of clamping.

[0013] 2. This utility model uses a combination of elastic rope and pressure sensor to monitor and provide feedback on the tensile force borne by plastic products in real time. Combined with a controller, it realizes automated data acquisition and analysis, which facilitates accurate determination of the maximum bearing capacity of the sample. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the overall structure of this utility model; Figure 2 This is the front view of the present invention; Figure 3 This is a schematic diagram of the clamp structure of this utility model; Figure 4 This is a schematic diagram of the U-shaped frame structure of this utility model.

[0015] In the diagram: 1. Base plate; 2. Support plate; 3. Support frame; 4. Strip groove; 5. First bidirectional lead screw; 6. First drive motor; 7. Moving seat; 8. Connecting seat; 9. Support seat; 10. Fixed frame; 11. U-shaped frame; 12. Second bidirectional lead screw; 13. Second drive motor; 14. Clamping plate; 15. Slot; 16. Pressure plate; 17. Limiting plate; 18. Guide shaft; 19. Elastic rope; 20. Pressure sensor; 21. Control box. Detailed Implementation

[0016] 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.

[0017] Example Reference Figures 1-4 A tensile testing device for plastic products includes a base plate 1, with mounting holes at each corner of the base plate 1. In actual use, bolts can be passed through the mounting holes to fix the base plate 1.

[0018] A support plate 2 is provided parallel above the base plate 1. Both ends of the support plate 2 are fixed to the base plate 1 by a support frame 3. Two clamps are provided between the support plate 2 and the base plate 1. Among them, such as Figure 1 and Figure 2 As shown, a strip groove 4 is provided at both ends of the support plate 2. A first bidirectional lead screw 5 is provided between the support plate 2 and the base plate 1. The first bidirectional lead screw 5 corresponds to the strip groove 4, and the end of the first bidirectional lead screw 5 is rotatably connected to the support frame 3. A first drive motor 6 is installed on one end of the first bidirectional lead screw 5. The first drive motor 6 is fixed on the support frame 3. Movable seats 7 are connected to both ends of the first bidirectional lead screw 5 through threaded nuts. A connecting seat 8 is installed on the top of the movable seat 7. The connecting seat 8 passes through the strip groove 4 and is connected to the clamp. Under the operation of the first drive motor 6, the two clamps can be driven to move closer or further apart. In use, first adjust the distance between the two clamps to correspond to the length of the plastic product to be tested. Then fix both ends of the plastic product on the two clamps respectively. Then the first bidirectional lead screw 5 drives the two clamps to start moving in opposite directions, thereby starting the pulling operation of the plastic product.

[0019] like Figure 3 and Figure 4 As shown, the clamp includes a support base 9, which is fixed to a connecting base 8. The support base 9 is located above the support plate 2, and a fixing frame 10 is installed on the top of the support base 9. A U-shaped frame 11 is installed on the top of the fixing frame 10. The openings of the two U-shaped frames 11 are arranged opposite each other. A second bidirectional lead screw 12 is provided inside the U-shaped frame 11. The end of the second bidirectional lead screw 12 is rotatably connected to the U-shaped frame 11. A second drive motor 13 is installed on the top of the second bidirectional lead screw 12 and is fixed to the U-shaped frame 11. Strip-shaped clamping plates 14 are provided at both ends of the second bidirectional lead screw 12. One end of the clamping plate 14 is threaded to the second bidirectional lead screw 12 through a nut. After the end of the plastic product is placed between the two clamping plates 14, the second drive motor 13 will start to operate, driving the second bidirectional lead screw 12 to rotate, thereby bringing the two clamping plates 14 closer together and clamping the end of the plastic product.

[0020] As the clamping plate 14 approaches the plastic product, several spaced slots 15 are formed on the other end of the clamping plate 14. One end of each slot 15 penetrates the side of the clamping plate 14, and a pressure plate 16 is placed inside the slot 15. The pressure plate 16 is perpendicular to the clamping plate 14. When the clamping plate 14 approaches the plastic product, the pressure plate 16 contacts the plastic product. Because the slots 15 of the upper and lower clamping plates 14 are staggered, the pressure plates 16 on the upper and lower surfaces of the plastic product will exert staggered pressure on the plastic product. Especially for softer plastic products, the pressure of the pressure plates 16 can cause the plastic product to embed into the adjacent two... The gap between the pressure plates 16 is used to limit the plastic product, improve the fixing effect of the clamp on the plastic product, and reduce the sliding of the plastic product between the clamping plates 14 when pulling the plastic product. Two limiting plates 17 are vertically installed on the end of the pressure plate 16, and the two limiting plates 17 are arranged on both sides of the clamping plate 14. Since the pressure plate 16 is placed in the slot 15, the appropriate number of pressure plates 16 can be selected according to the different materials of the plastic product to fix the plastic product, ensuring that the effect of the pressure plate 16 on the plastic product is moderate, so as to improve the adaptability of the clamp to hold and fix the plastic product.

[0021] Furthermore, in order to ensure the stability of the fixture during movement, the side of the connecting seat 8 is fitted with the inner wall of the strip groove 4 with a clearance, and the bottom of the support seat 9 is fitted with the top surface of the support plate 2 with a clearance, so as to guide the movement of the moving seat 7 on the first bidirectional lead screw 5 and improve the stability of the moving seat 7.

[0022] In order to improve the stability of the clamping plate 14 during movement, at least one guide shaft 18 is provided parallel to the side of the second bidirectional lead screw 12. The guide shaft 18 slides through the clamping plate 14, and the end of the guide shaft 18 is fixed to the inner wall of the U-shaped frame 11 to provide guidance for the movement of the clamping plate 14.

[0023] Specifically, a control box 21 is provided on one side above the base plate 1. The control box 21 contains a controller, which is connected to the second drive motor 13 and the first drive motor 6 via wires. In actual use, the controller is one of a PLC logic controller, a control motherboard, or a control host.

[0024] When the plastic product is pulled, an elastic rope 19 is provided between the two fixed frames 10. A pressure sensor 20 is provided at one end of the elastic rope 19. The pressure sensor 20 is located in one of the fixed frames 10, while the other end of the elastic rope 19 is fixed to the other fixed frame 10. The pressure sensor 20 is connected to the controller through a wire. The elastic rope 19 will deform as it is pulled, and the force of the deformation acts on the pressure sensor 20. Thus, the magnitude of the pulling force is obtained through the pressure sensor 20. In actual use, after the plastic product is fixed by the clamp, the elastic rope 19 is in a stretched state, thereby ensuring that all subsequent deformation forces of the elastic rope 19 are the pulling force acting on the plastic product.

[0025] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A tensile testing device for plastic products, characterized in that: Includes a base plate (1), and a support plate (2) is provided parallel above the base plate (1). Both ends of the support plate (2) are fixed to the base plate (1) by a support frame (3). Two clamps are provided between the support plate (2) and the base plate (1). The fixture includes a support base (9), which is located above the support plate (2). A fixing frame (10) is installed on the top of the support base (9). A U-shaped frame (11) is installed on the top of the fixing frame (10). The openings of the two U-shaped frames (11) are arranged opposite to each other. A second bidirectional lead screw (12) is provided inside the U-shaped frame (11). The end of the second bidirectional lead screw (12) is rotatably connected to the U-shaped frame (11). A second drive motor (13) is installed on the top of the second bidirectional lead screw (12). The second drive motor (13) is fixed on the U-shaped frame (11). A strip-shaped clamp (14) is provided at both ends of the second bidirectional lead screw (12). One end of the clamp (14) is threaded to the second bidirectional lead screw (12) through a nut. Several slots (15) are arranged at intervals on the other end of the clamping plate (14). The slots (15) of the upper and lower clamping plates (14) are staggered. One end of the slot (15) passes through the side of the clamping plate (14). A pressure plate (16) is built into the slot (15). The pressure plate (16) is perpendicular to the clamping plate (14). Two limiting plates (17) are vertically installed on the end of the pressure plate (16). The two limiting plates (17) are arranged on both sides of the clamping plate (14).

2. The tensile testing equipment for plastic products according to claim 1, characterized in that: At least one guide shaft (18) is provided parallel to the side of the second bidirectional lead screw (12). The guide shaft (18) slides through the clamp (14), and the end of the guide shaft (18) is fixed to the inner wall of the U-shaped frame (11).

3. The tensile testing equipment for plastic products according to claim 1, characterized in that: A control box (21) is provided on one side above the base plate (1). A controller is provided inside the control box (21), and the controller is connected to the second drive motor (13) through a wire.

4. The tensile testing equipment for plastic products according to claim 3, characterized in that: An elastic rope (19) is provided between two fixed frames (10). A pressure sensor (20) is provided at one end of the elastic rope (19). The pressure sensor (20) is located on one of the fixed frames (10), while the other end of the elastic rope (19) is fixed to the other fixed frame (10). The pressure sensor (20) is connected to the controller through a wire.

5. The tensile testing device for plastic products according to claim 3, characterized in that: A strip groove (4) is provided at both ends of the support plate (2). A first bidirectional screw rod (5) is provided between the support plate (2) and the base plate (1). The first bidirectional screw rod (5) corresponds to the strip groove (4). The end of the first bidirectional screw rod (5) is rotatably connected to the support frame (3). A first drive motor (6) is installed on one end of the first bidirectional screw rod (5). The first drive motor (6) is fixed on the support frame (3). The first drive motor (6) is connected to the controller through a wire. A movable seat (7) is connected to both ends of the first bidirectional screw rod (5) through a threaded nut. A connecting seat (8) is installed on the top of the movable seat (7). The connecting seat (8) passes through the strip groove (4) and is connected to the support seat (9).

6. The tensile testing equipment for plastic products according to claim 5, characterized in that: The side of the connecting seat (8) is fitted with the inner wall of the strip groove (4) with a clearance, and the bottom of the support seat (9) is fitted with the top surface of the support plate (2) with a clearance.

7. The tensile testing equipment for plastic products according to claim 1, characterized in that: Mounting holes are provided at the corners of the base plate (1).

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