A new material plastic strip tensile capacity detection device

Abstract

This invention discloses a novel device for testing the tensile strength of plastic strips, belonging to the field of new material testing technology. It includes a base, a gantry frame fixed to the base, and a motor fixed to the gantry frame. The output end of the motor is fixed to a first bidirectional lead screw. This device, through the coordinated operation of a correction mechanism and a clamping mechanism, utilizes the reverse force of the tension to drive the circular plate, fixed rod, and mounting plate to move in multiple dimensions during the initial stage of plastic strip stretching. This allows for adaptive adjustment of the positions of the clamping mechanism and both ends of the plastic strip, ensuring that the stretching direction of the plastic strip remains parallel to the direction of the tensile force. Simultaneously, after correction, the positions of the circular plate, mounting plate, and plastic strip are fixed by the engagement and locking of the toothed blocks and toothed strips, avoiding detection deviations caused by component movement during stretching. This significantly improves the accuracy of the plastic strip tensile strength test data, providing precise data support for the performance evaluation of novel plastic strips.

Description

Technical Field

[0001] This invention relates to the field of new material testing technology, specifically to a new material plastic strip tensile strength testing device. Background Technology

[0002] With the rapid development of the new materials industry, plastic strips, as a key basic material with lightweight, corrosion resistance, and good flexibility, are widely used in new energy vehicles, aerospace, packaging and other fields. Their tensile properties (such as tensile strength and elongation at break) are core indicators for evaluating material reliability. However, existing tensile testing devices have significant shortcomings: 1. Traditional devices rely on manual visual alignment, and the deviation between the sample axis and the loading direction often exceeds ±2°, resulting in eccentric load and thus affecting the accuracy of tensile strength measurement data; 2. During the stretching process, the clamping force of the plastic strip is easily weakened due to the elastic shrinkage of the material, which may cause the sample to fall off and thus affect the normal progress of the test. 3. After the plastic strip is initially clamped, it is difficult to automatically correct for slight angular deviations, which affects the uniformity of stress distribution and further affects the accuracy of the test data. Summary of the Invention

[0003] The purpose of this invention is to provide a novel device for testing the tensile strength of plastic strips, in order to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a novel plastic strip tensile strength testing device, comprising a base, a gantry frame fixed on the base, a motor fixed on the gantry frame, the output end of the motor being fixed to a first bidirectional lead screw, the first bidirectional lead screw bearing being connected between the base and the gantry frame, the first bidirectional lead screw being connected to a movable plate for driving two movable plates to move, and a fixed frame being provided on one side of the two movable plates facing each other, the fixed frame being equipped with a correction mechanism for automatically correcting and locking the tensile direction of the plastic strip, the correction mechanism being connected to a clamping mechanism, and the clamping mechanism being used for clamping and fixing both ends of the plastic strip and for pre-tightening and preventing loosening of both ends of the plastic strip during stretching.

[0005] Preferably, the movable plate and the upright are slidably connected, and the upright is fixed between the base and the gantry frame. The upright is symmetrically distributed about the center line of the base. When the movable plate is driven to move by the motor and the first bidirectional lead screw, the sliding guide between the movable plate and the upright can ensure the stability of the movable plate's movement.

[0006] Preferably, the movable plate and the vertical rod are slidably connected, and the vertical rod and the fixed frame are fixedly connected. A first spring is fixed between the vertical rod and the movable plate. Through the sliding action between the movable plate and the vertical rod, the stability of the movable plate's movement is ensured when the movable plate moves relative to the fixed frame. Furthermore, the elastic action of the first spring provides a basic guarantee for the automatic reset of the movable plate.

[0007] Preferably, the correction mechanism includes four movable blocks that are slidably connected to the fixed frame, and the movable blocks are equidistantly distributed. The movable blocks are slidably connected to the sliding rods, and the sliding rods are distributed in a one-to-one correspondence with the movable blocks. The sliding rods are fixed to the circular plate at equal angles. Through the sliding action between the movable blocks and the fixed frame and the sliding action between the sliding rods and the movable blocks, the circular plate can be adjusted in multiple dimensions, thereby providing a basic guarantee for the automatic correction of the plastic strip during subsequent tensile testing.

[0008] Preferably, a fixing rod is fixed to the lower end of the circular plate, and a mounting plate is fixed to the lower end of the fixing rod. The mounting plate is connected to the clamping mechanism. Through the multi-dimensional adjustment of the circular plate, the fixing rod can be moved in multiple dimensions, thereby providing a basic guarantee for realizing the multi-dimensional adjustment of the clamping mechanism.

[0009] Preferably, a locking block is fixed on the movable block, and the locking block cooperates with the locking rack to achieve a locking effect. The locking rack is fixed to one end of the connecting rod, while the connecting rod is slidably connected to the fixed frame. The other end of the connecting rod is fixed to the movable plate. By moving the movable plate, the connecting rod and the locking rack can be moved, thereby adjusting the position between the locking rack and the locking block. This provides a basic guarantee for locking and unlocking the circular plate, and thus ensures the stability of the circular plate during subsequent testing.

[0010] Preferably, the clamping mechanism includes a round rod that is slidably connected to the mounting plate, and the round rod is symmetrically fixed to the mounting frame. One end of the round rod is fixed to one end of a second spring, while the other end of the second spring is fixed to a pressure sensor. The pressure sensor is fixed to the mounting plate, and the pressure sensor is slidably connected to the round rod. The elastic coefficient of the second spring is greater than that of the first spring. When the mounting frame moves relative to the mounting plate, the sliding guidance between the round rod and the mounting plate can ensure the stability of the movement of the mounting frame. Furthermore, the pressure sensor provides a basic guarantee for tensile force detection.

[0011] Preferably, the mounting bracket is connected to a second bidirectional lead screw via a bearing, and the second bidirectional lead screw is threadedly connected to the connecting block, while the connecting block and the mounting bracket are slidably connected. The connecting block and the mounting base are fixed to each other, and the mounting base contacts the clamping plate. The clamping surface of the clamping plate is provided with anti-slip texture. The second bidirectional lead screw allows the connecting block to move, and the sliding action between the connecting block and the mounting bracket ensures the stability of the connecting block's movement, thereby adjusting the distance between the two clamping plates. This provides a basic guarantee for clamping and fixing the plastic strip, and the anti-slip strip on the clamping surface of the clamping plate ensures the stability of clamping and fixing the plastic strip.

[0012] Preferably, a crossbar is fixed to the clamping plate, and the crossbar is slidably connected to the mounting base. The crossbar is also fixed to the fixing plate. At the same time, the fixing plate is fixed to one end of the third spring, and the other end of the third spring is fixed to the disc. A convex shaft is fixed on the disc, and the convex shaft is slidably connected to the mounting base. With the above structure, when the disc moves, the elastic action of the third spring can provide a pre-tightening force to the clamping plate, thereby further ensuring the stability of clamping and fixing during the plastic strip tensile testing process.

[0013] Preferably, the disc and the threaded rod are connected by a thread, and the threaded rod is bearing-connected to the mounting base. A gear is fixed on the threaded rod, and the gear meshes with the rack to achieve transmission. The rack is fixed to one end of the guide rod, and a T-block is fixed to the other end of the guide rod. The T-block is slidably connected to the mounting plate. The guide rod is slidably connected to the bracket, and the bracket is fixedly connected to the connecting block. The bracket is slidably connected to the mounting frame. By moving the bracket through the connecting block, the gear and the rack can always maintain a meshing state. Through the meshing transmission between the rack and the gear, the threaded rod can be driven to rotate, thereby moving the disc, thus providing a basic guarantee for achieving the clamping and pre-tightening of the plastic strip.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This new material plastic strip tensile strength testing device, through the coordinated operation of the correction mechanism and the clamping mechanism, utilizes the reverse force of the tension to drive the circular plate, the fixed rod, and the mounting plate to move in multiple dimensions during the initial stage of plastic strip tensioning. This enables the clamping mechanism and the two ends of the plastic strip to adaptively adjust their positions, ensuring that the stretching direction of the plastic strip remains parallel to the direction of the tension force. Simultaneously, after the correction is completed, the positions of the circular plate, the mounting plate, and the plastic strip are fixed by the engagement and locking of the toothed block and the toothed strip, avoiding detection deviations caused by component shaking during the stretching process. This significantly improves the accuracy of the plastic strip tensile strength test data and provides precise data support for the performance evaluation of the new material plastic strip. 2. In this new plastic strip tensile strength testing device, the clamping mechanism is driven by a second bidirectional lead screw to move the clamping plates towards each other. The anti-slip texture on the clamping surface of the clamping plates increases the friction between the clamping plates and the ends of the plastic strip, achieving a firm clamping of both ends of the plastic strip. Simultaneously, during the tensile testing process, when the mounting plate moves relative to the mounting frame, the meshing transmission of the convex rack and gear, and the threaded connection between the threaded rod and the disc, drive the disc to move towards one side of the clamping plate. Combined with the elastic force of the third spring, this generates an automatic pre-tightening force on the clamping end of the plastic strip, effectively avoiding the loosening problem caused by the shrinkage of the clamping end due to tensile elastic deformation of the plastic strip, ensuring a stable and continuous tensile testing process. 3. This new material plastic strip tensile strength testing device, by setting a first spring and a second spring with different elastic coefficients, utilizes the elastic difference between the two springs to achieve a small initial stretch of the plastic strip during the initial movement of the movable plate. This not only applies an initial tension to the plastic strip, providing a force basis for subsequent correction and adjustment, but also avoids excessive initial tension that could cause premature deformation or damage to the plastic strip. It is adaptable to the testing of new material plastic strips with different elasticities and specifications, thus improving the adaptability of the device. Attached Figure Description

[0015] Figure 1 This is a frontal three-dimensional structural diagram of the overall composition of the device of the present invention; Figure 2 This is a rear-view three-dimensional structural diagram of the overall composition of the device of the present invention; Figure 3 This is a frontal three-dimensional structural diagram of the movable plate of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the fixed frame of the present invention, viewed from below. Figure 5 This is a frontal cross-sectional three-dimensional structural diagram of the mounting bracket of the present invention; Figure 6 This is a frontal perspective three-dimensional structural diagram of the mounting base of the present invention; Figure 7 This is a bottom-view cross-sectional three-dimensional structural diagram of the mounting base of the present invention.

[0016] In the diagram: 1. Base; 2. Gantry frame; 3. Motor; 4. First double-acting lead screw; 5. Movable plate; 501. Upright pole; 502. Vertical rod; 503. First spring; 6. Fixed frame; 7. Correction mechanism; 701. Moving block; 702. Sliding rod; 703. Circular plate; 704. Fixed rod; 705. Mounting plate; 706. Gear block; 707. Gear rack; 708. Connecting rod; 8. Clamping mechanism; 801. Installation 802. Frame; 803. Round rod; 804. Second spring; 805. Pressure sensor; 806. Second double-acting lead screw; 807. Connecting block; 808. Mounting base; 809. Clamping plate; 810. Crossbar; 811. Fixing plate; 812. Third spring; 813. Disc; 814. Convex shaft; 815. Threaded rod; 816. Gear; 817. Convex rack; 818. Guide rod; 819. T-block; 810. Bracket. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-7 This invention provides a technical solution: a new material plastic strip tensile strength testing device, including a base 1, a gantry frame 2 fixed on the base 1, a motor 3 fixed on the gantry frame 2, the output end of the motor 3 being fixed to a first bidirectional lead screw 4, the first bidirectional lead screw 4 being connected by a bearing between the base 1 and the gantry frame 2, the first bidirectional lead screw 4 being connected to a movable plate 5 for driving two movable plates 5 to move, and a fixed frame 6 being provided on one side of the two movable plates 5 facing each other, the fixed frame 6 being equipped with a correction mechanism 7 for automatically correcting and locking the tensile direction of the plastic strip, the correction mechanism 7 being connected to a clamping mechanism 8, and the clamping mechanism 8 being used for clamping and fixing the two ends of the plastic strip and for pre-tightening and preventing loosening of the two ends of the plastic strip during stretching.

[0019] The clamping mechanism 8 includes a round rod 802 that is slidably connected to the mounting plate 705. The round rod 802 is symmetrically fixed to the mounting frame 801. One end of the round rod 802 is fixed to one end of the second spring 803, while the other end of the second spring 803 is fixed to the pressure sensor 804. The pressure sensor 804 is fixed to the mounting plate 705, and the pressure sensor 804 is slidably connected to the round rod 802. The elastic coefficient of the second spring 803 is greater than that of the first spring 503. A second bidirectional lead screw 805 is connected to the mounting frame 801 by a bearing. The second bidirectional lead screw 805 is threadedly connected to the connecting block 806, and the connecting block 806 is slidably connected to the mounting frame 801. The connecting block 806 is fixed to the mounting base 807, and the mounting base 807 contacts the clamping plate 808. The clamping surface of the clamping plate 808 is provided with anti-slip texture. When using this new material plastic strip tensile strength testing device, such as Figures 1-7 As shown, firstly, the two ends of the plastic strip sample are clamped and fixed. The end of the plastic strip is placed between two clamping plates 808. By rotating the second bidirectional lead screw 805, and with the threaded connection between the second bidirectional lead screw 805 and the connecting block 806, the connecting block 806, the mounting base 807, and the clamping plate 808 can be moved. With the sliding guide between the connecting block 806 and the mounting bracket 801, the stability of the movement of the connecting block 806, the mounting base 807, and the clamping plate 808 can be ensured, thereby realizing the distance adjustment between the two clamping plates 808 until the clamping surfaces of the two clamping plates 808 contact the end of the plastic strip to achieve clamping and fixing. Furthermore, the anti-slip strips on the clamping surfaces of the clamping plates 808 can increase the friction between the clamping plates 808 and the end of the plastic strip, further ensuring the stability of the clamping and fixing of the plastic strip. Based on the above principle, the two ends of the plastic strip can be clamped and fixed. The movable plate 5 and the upright 501 are slidably connected, and the upright 501 is fixed between the base 1 and the gantry 2. The upright 501 is symmetrically distributed about the center line of the base 1. The movable plate 5 and the vertical rod 502 are slidably connected, and the vertical rod 502 is fixedly connected to the fixed frame 6. A first spring 503 is fixed between the vertical rod 502 and the movable plate 5. The correction mechanism 7 includes a movable block 701 that is slidably connected to the fixed frame 6. Four movable blocks 701 are evenly distributed at angles. The movable blocks 701 are slidably connected to the sliding rod 702. 02 and the movable block 701 are distributed in a one-to-one correspondence. The slide rod 702 is fixed at an equal angle on the circular plate 703. The lower end of the circular plate 703 is fixed with a fixing rod 704, and the lower end of the fixing rod 704 is fixed with a mounting plate 705. The mounting plate 705 is connected to the clamping mechanism 8. The movable block 701 is fixed with a toothed block 706, and the toothed block 706 cooperates with the toothed rack 707 to achieve a locking function. The toothed rack 707 is fixed to one end of the connecting rod 708. At the same time, the connecting rod 708 is slidably connected to the fixed frame 6. The other end of the connecting rod 708 is fixed to the movable plate 5. After the plastic strip is fixed, as follows Figures 1-7 As shown, at this time, it is only necessary to control the motor 3 to drive the first bidirectional lead screw 4 to rotate, thereby causing the two movable plates 5 to move in opposite directions. Combined with the sliding guide effect between the movable plates 5 and the upright 501, the stability of the movement of the movable plates 5 can be ensured. In the initial stage of movement of the movable plates 5, since the elastic coefficient of the second spring 803 is greater than that of the first spring 503, the force of the movable plates 5 moving at this time exerts pressure on both the second spring 803 and the first spring 503, causing the first spring 503 and the second spring 803 to contract synchronously. Furthermore, the contraction length of the first spring 503 is greater than that of the second spring 803. Through the counterforce of the second spring 803, the initial small movement of the plastic strip can be achieved. The stretching action applies tension to the plastic strip. Since the plastic strip is a flexible material with good elasticity, it is difficult to ensure that the tension is parallel to the stretching direction of the plastic strip during the initial clamping and fixing. In the initial stretching stage of the plastic strip, the reverse stretching force can generate a traction force on the mounting plate 705. Combined with the sliding action between the slide rod 702 and the moving block 701 and the sliding action between the moving block 701 and the fixed frame 6, the circular plate 703, the fixed rod 704 and the mounting plate 705 can be moved under the traction force, thereby realizing multi-dimensional adjustment of the position of the clamping mechanism 8, and thus realizing multi-dimensional adjustment of both ends of the plastic strip, ensuring that the plastic strip is parallel to the stretching direction, thereby ensuring the accuracy of subsequent test data. Furthermore, when the first spring 503 is compressed, the movable plate 5 moves relative to the fixed frame 6. With the sliding guide effect between the movable plate 5 and the vertical rod 502, the stability of the movement of the movable plate 5 can be ensured. Moreover, the movement of the movable plate 5 can simultaneously drive the connecting rod 708 and the toothed rack 707 to move. With the sliding guide effect between the connecting rod 708 and the fixed frame 6, the stability of the movement of the toothed rack 707 can be ensured. The movable block 701 is locked when the toothed rack 707 engages with the toothed block 706. This locks the positions of the circular plate 703, the fixed rod 704, the mounting plate 705, and the plastic strip, ensuring that the accuracy of the test data is not affected by the shaking of the circular plate 703 during the subsequent stretching process. A crossbar 809 is fixed to the clamping plate 808, and the crossbar 809 is slidably connected to the mounting base 807. The crossbar 809 is also fixed to the fixing plate 810. Simultaneously, the fixing plate 810 is fixed to one end of the third spring 811, and the other end of the third spring 811 is fixed to the disc 812. A convex shaft 813 is fixed to the disc 812, and the convex shaft 813 is slidably connected to the mounting base 807. The disc 812 is threadedly connected to the threaded rod 814, and the threaded rod 814 is bearing-connected to the mounting base 807. A gear 815 is fixed on the seat 807 and the threaded rod 814. The gear 815 meshes with the convex rack 816 to achieve transmission. The convex rack 816 is fixed to one end of the guide rod 817, and a T-block 818 is fixed to the other end of the guide rod 817. The T-block 818 is slidably connected to the mounting plate 705. The guide rod 817 is slidably connected to the bracket 819. The bracket 819 is fixedly connected to the connecting block 806. The bracket 819 is slidably connected to the mounting bracket 801. After the plastic material has been corrected, such as Figures 1-7 As shown, at this time, because the toothed rack 707 and the toothed block 706 are engaged, the movable plate 5, the fixed frame 6 and the correction mechanism 7 form a whole. When the first bidirectional screw 4 continues to drive the movable plate 5 to continue moving, the force generated by the movement of the movable plate 5 is entirely applied to the mounting plate 705. Combined with the sliding action between the mounting plate 705 and the round rod 802, the mounting plate 705 moves relative to the mounting bracket 801, thereby causing the second spring 803 to continue to contract. Through the elastic force of the second spring 803, the stretching effect on the plastic strip is achieved. With the help of the pressure sensor 804, the magnitude of the tension can be detected to determine the tensile strength of the plastic strip. During the tensile testing process, when the mounting plate 705 moves relative to the mounting bracket 801, it simultaneously drives the T-block 818, guide rod 817, and convex rack 816 to move relative to the mounting bracket 801. The meshing transmission between the convex rack 816 and gear 815 causes the threaded rod 814 to rotate under force. The threaded connection between the threaded rod 814 and the disc 812 causes the disc 812 to move towards the clamping plate 808. The sliding action between the convex shaft 813 and the mounting base 807 ensures the stability of the disc 812's movement. At this time, the second spring 803 contracts under force. Through the elastic force of the second spring 803, force is applied to the fixing plate 810, crossbar 809, and clamping plate 808. This allows the clamping plate 808 to automatically pre-tighten the clamping end of the plastic strip during the tensile process, preventing the clamping end from shrinking due to the elastic deformation of the plastic strip itself, thus ensuring the stability of the tensile testing.

[0020] It should be noted that, in this document, 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 process, method, article, or apparatus.

[0021] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A novel material plastic strip tensile strength testing device, comprising a base (1), wherein a gantry frame (2) is fixed on the base (1), characterized in that: A motor (3) is fixed on the gantry frame (2). The output end of the motor (3) is fixed to the first bidirectional lead screw (4). The first bidirectional lead screw (4) is connected between the base (1) and the gantry frame (2) by a bearing. The first bidirectional lead screw (4) is connected to the movable plate (5) to drive the two movable plates (5) to move. A fixed frame (6) is provided on one side of the two movable plates (5) facing each other. A correction mechanism (7) for automatically correcting and locking the stretching direction of the plastic strip is installed on the fixed frame (6). The correction mechanism (7) is connected to the clamping mechanism (8). The clamping mechanism (8) is used for clamping and fixing the two ends of the plastic strip and for pre-tightening and preventing loosening of the two ends of the plastic strip during stretching.

2. The device for testing the tensile strength of a new type of plastic strip according to claim 1, characterized in that: The movable plate (5) and the upright (501) are slidably connected, and the upright (501) is fixed between the base (1) and the gantry (2), and the upright (501) is symmetrically distributed about the center line of the base (1).

3. The new material plastic strip tensile strength testing device according to claim 1, characterized in that: The movable plate (5) and the vertical rod (502) are slidably connected, and the vertical rod (502) and the fixed frame (6) are fixedly connected. A first spring (503) is fixed between the vertical rod (502) and the movable plate (5).

4. The device for testing the tensile strength of a new type of plastic strip according to claim 1, characterized in that: The correction mechanism (7) includes a movable block (701) that is slidably connected to the fixed frame (6), and there are four movable blocks (701) distributed at equal angles. The movable blocks (701) are slidably connected to the slide rods (702), and the slide rods (702) are distributed in a one-to-one correspondence with the movable blocks (701). The slide rods (702) are fixed at equal angles on the circular plate (703).

5. The new material plastic strip tensile strength testing device according to claim 4, characterized in that: The lower end of the circular plate (703) is fixed with a fixing rod (704), and the lower end of the fixing rod (704) is fixed with a mounting plate (705), and the mounting plate (705) is connected to the clamping mechanism (8).

6. The new material plastic strip tensile strength testing device according to claim 5, characterized in that: The movable block (701) is fixed with a toothed block (706), and the toothed block (706) cooperates with the toothed rack (707) to achieve a locking function. The toothed rack (707) is fixed to one end of the connecting rod (708), and the connecting rod (708) is slidably connected to the fixed frame (6). The other end of the connecting rod (708) is fixed to the movable plate (5).

7. The new material plastic strip tensile strength testing device according to claim 6, characterized in that: The clamping mechanism (8) includes a round rod (802) that is slidably connected to the mounting plate (705), and the round rod (802) is symmetrically fixed to the mounting bracket (801). The round rod (802) is fixed to one end of the second spring (803), and the other end of the second spring (803) is fixed to the pressure sensor (804). The pressure sensor (804) is fixed to the mounting plate (705), and the pressure sensor (804) is slidably connected to the round rod (802). The elastic coefficient of the second spring (803) is greater than that of the first spring (503).

8. The new material plastic strip tensile strength testing device according to claim 7, characterized in that: The mounting bracket (801) is connected to a bearing with a second bidirectional lead screw (805), and the second bidirectional lead screw (805) is threadedly connected to the connecting block (806), and the connecting block (806) is slidably connected to the mounting bracket (801). At the same time, the connecting block (806) and the mounting seat (807) are fixed to each other. The mounting seat (807) is in contact with the clamping plate (808), and the clamping surface of the clamping plate (808) is provided with anti-slip texture.

9. The new material plastic strip tensile strength testing device according to claim 8, characterized in that: A crossbar (809) is fixed on the clamping plate (808), and the crossbar (809) is slidably connected to the mounting base (807). The crossbar (809) is fixed to the fixing plate (810), and the fixing plate (810) is fixed to one end of the third spring (811). The other end of the third spring (811) is fixed to the disc (812), and a convex shaft (813) is fixed on the disc (812). The convex shaft (813) is slidably connected to the mounting base (807).

10. The new material plastic strip tensile strength testing device according to claim 9, characterized in that: The disc (812) and the threaded rod (814) are connected by a thread, and the threaded rod (814) is connected to the mounting base (807) by a bearing. A gear (815) is fixed on the threaded rod (814), and the gear (815) meshes with the convex rack (816) to achieve transmission. One end of the convex rack (816) is fixed to the guide rod (817), and the other end of the guide rod (817) is fixed with a T-block (818). The T-block (818) is slidably connected to the mounting plate (705). The guide rod (817) is slidably connected to the bracket (819), and the bracket (819) is fixedly connected to the connecting block (806). The bracket (819) is slidably connected to the mounting bracket (801).

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