Tension testing device

Abstract

The utility model provides a tension testing device, and relates to the technical field of testing devices. The tension test device comprises a main board, a protection mechanism, a fixing mechanism and a transmission mechanism, the protection mechanism comprises a plurality of supporting frames which are arranged at intervals in the length direction of the main plate, the two ends of each supporting frame are installed on the main plate, a folding assembly is installed between every two adjacent supporting frames, and each folding assembly has a folded state and an unfolded state; the fixing mechanism is provided with a clamping area used for clamping a tested object and is located between the main board and the supporting frame. The transmission mechanism is in transmission connection with the fixing mechanism to drive the fixing mechanism to reciprocate in the length direction of the main board. The tension test device provided by the utility model solves the technical problems in the prior art that the equipment for detecting the suspender is easy to damage and the maintenance efficiency is low.

Description

Technical Field

[0001] The utility model relates to the technical field of testing devices, in particular to a tension testing device. Background Art

[0002] A tied-arch bridge combines the advantages of both arches and beams. It combines these two basic structural forms to jointly bear loads, leveraging the structural properties and combined effects of the beam's bending and the arch's compression. Horizontal thrust at the arch ends is absorbed by tie rods, eliminating horizontal thrust from the arch end supports. The arch and chords are connected by vertical rods hinged at both ends. The suspenders, as the tension members of a tied-arch bridge, carry only axial tension, enhancing the stability of the arch ribs.

[0003] The existing technology has the following problems: when testing the boom, since most booms are made of high-strength steel wire bundles, they are prone to breakage when subjected to extreme tension during the testing process. When the steel wire bundles break, they will produce scattered steel wires, and the broken steel wire bundles will rebound, and the broken steel wire bundles will hit the equipment, increasing the probability of equipment damage. At the same time, when maintaining the equipment, the steps required for existing equipment maintenance are relatively cumbersome, which leads to low maintenance efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a tension testing device to alleviate the technical problems in the prior art that the equipment for testing the suspension rod is easily damaged and has low maintenance efficiency.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0006] The tension test device provided by the utility model comprises a main board, a protection mechanism, a fixing mechanism and a transmission mechanism;

[0007] The protection mechanism includes a plurality of support frames spaced apart along the length direction of the main board, both ends of the support frames are mounted on the main board, a folding assembly is mounted between two adjacent support frames, and the folding assembly has a folded state and an unfolded state;

[0008] The fixing mechanism is provided with a clamping area for clamping the object to be measured and the fixing mechanism is located between the main board and the support frame;

[0009] The transmission mechanism is in transmission connection with the fixing mechanism to drive the fixing mechanism to move back and forth along the length direction of the main board.

[0010] Furthermore, the folding assembly includes two baffles and a connecting shaft;

[0011] The two baffles are arranged along the width direction of the main board. The two baffles are rotatably connected on one side close to each other through the connecting shaft, and both ends of the other side are slidably connected to the support frame through a sliding assembly.

[0012] Furthermore, the sliding assembly includes a slider, a fixed plate, a rotating shaft and a slide groove provided on the support frame, the slider is installed in the slide groove and slidably cooperates with the slide groove, and the slider is used to connect to an external power source;

[0013] The slider is provided with a fixed plate, a rotating shaft is provided in the fixed plate, and the baffle is connected to the rotating shaft.

[0014] Furthermore, the fixing mechanism includes two fixing components that are arranged opposite to each other along the width direction of the main board. Both fixing components are transmission-connected to the transmission mechanism, and the clamping area is formed between the two fixing components.

[0015] Furthermore, the fixing assembly includes a clamping plate, a curved plate and a second telescopic rod, the clamping plate is in transmission connection with the transmission mechanism, the curved plate has an arc-shaped cross section and is connected to the clamping plate via the second telescopic rod to drive the curved plate to move toward or away from the clamping plate;

[0016] The arc-shaped plates of the two fixing assemblies are arranged opposite to each other to form the clamping area.

[0017] Furthermore, a sleeve is fixedly mounted on the inner wall of the clamping plate, and the second telescopic rod is mounted in the sleeve.

[0018] Furthermore, an elastic member is provided on the outer cover of the second telescopic rod, and two ends of the elastic member are respectively in contact with the arc plate and the clamping plate.

[0019] Furthermore, the fixing assembly further comprises a movable plate and a first telescopic rod;

[0020] The movable plate is in transmission connection with the transmission mechanism and is connected to the clamping plate via the first telescopic rod, so as to drive the clamping plate to move toward or away from the movable plate.

[0021] Furthermore, the main board is provided with two rotation slots, both of which are located in the support frame and are spaced apart along the width direction of the main board;

[0022] The transmission mechanism includes two double-headed screws, the double-headed screws are installed in the rotation groove, and the fixing assembly is installed on the double-headed screws and is matched with the threads of the double-headed screws.

[0023] Furthermore, the end of the double-headed screw is connected to a driving member.

[0024] Based on the above technical solutions, the technical effects that can be achieved by this utility model are analyzed as follows:

[0025] The tensioning test device provided by the utility model includes a main board, a protective mechanism, a fixing mechanism and a transmission mechanism; the protective mechanism includes a plurality of support frames arranged at intervals along the length direction of the main board, both ends of the support frames are installed on the main board, and a folding assembly is installed between two adjacent support frames, and the folding assembly has a folded state and an unfolded state; the fixing mechanism is provided with a clamping area for clamping the object to be tested and the fixing mechanism is located between the main board and the support frame; the transmission mechanism is connected to the fixing mechanism to drive the fixing mechanism to move back and forth along the length direction of the main board.

[0026] The mainboard supports the protective mechanism, fixing mechanism, and transmission mechanism. The protective mechanism isolates the test area from the outside world, reducing the rebound range of a broken test object and, in turn, the probability of device damage. The fixing mechanism clamps the test object. The transmission mechanism drives the fixing mechanism to move, thereby stretching the test object held therein to meet testing requirements.

[0027] This tension test device is suitable for use with test objects such as booms. By installing a protective mechanism, the folding assembly within the protective mechanism remains deployed during testing. This reduces the rebound potential of the broken wire bundle when the boom breaks, protecting the lower-hardness components within the test device from impact and thus reducing the probability of damage. Furthermore, when cleaning the tension test device, the folding assembly within the protective mechanism remains folded, making it easier for staff to clean and improving equipment maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 A schematic structural diagram of a tension testing device provided in an embodiment of the present utility model;

[0030] Figure 2 A schematic structural diagram of a protective mechanism in a tension testing device provided by an embodiment of the present utility model;

[0031] Figure 3 for Figure 2 A partial enlarged view of point A in the middle;

[0032] Figure 4 A schematic structural diagram of a fixing assembly in a tension testing device provided by an embodiment of the present utility model;

[0033] Figure 5 for Figure 4 A partial enlarged view of point B in the middle.

[0034] icon:

[0035] 1- Mainboard; 6- Rotation slot; 2- Bracket; 3- Placement slot; 4- Placement plate;

[0036] 5-protection mechanism; 10-support frame; 11-slide; 15-folding assembly; 22-baffle; 23-connecting shaft; 12-slider; 13-fixed plate; 14-rotating shaft;

[0037] 8-fixed assembly; 18-clamping plate; 9-arc plate; 20-second telescopic rod; 19-sleeve; 21-elastic member; 16-movable plate; 17-first telescopic rod;

[0038] 7-double-headed screw; 24-driving member. DETAILED DESCRIPTION

[0039] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0042] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0043] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0044] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0045] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0046] See also Figures 1 to 5 The tensioning test device provided by the embodiment of the present invention includes a main board 1, a protective mechanism 5, a fixing mechanism and a transmission mechanism; the protective mechanism 5 includes a plurality of support frames 10 arranged at intervals along the length direction of the main board 1, and both ends of the support frames 10 are installed on the main board 1. A folding component 15 is installed between two adjacent support frames 10, and the folding component 15 has a folded state and an unfolded state; the fixing mechanism is provided with a clamping area for clamping the object to be tested and the fixing mechanism is located between the main board 1 and the support frame 10; the transmission mechanism is connected to the fixing mechanism to drive the fixing mechanism to move back and forth along the length direction of the main board 1.

[0047] Specifically, the folded state of the folding assembly 15 refers to the folding assembly 15 being gathered; see Figure 1 The unfolded state of the folding assembly 15 means that the folding assembly 15 is fully unfolded. Furthermore, the support frame 10 is provided with at least five; Figure 1 In this embodiment, five support frames 10 are provided, and the five support members are evenly arranged along the length direction of the mainboard 1.

[0048] The mainboard 1 supports the protective mechanism 5, the fixing mechanism, and the transmission mechanism. The protective mechanism 5 is used to separate the test area from the outside world, which can reduce the rebound range of the broken test object, thereby reducing the probability of damage to the device; and it reduces the steps required by the staff when maintaining the equipment. The fixing mechanism is used to clamp the test object. The transmission mechanism is used to drive the fixing mechanism to move, thereby driving the test object clamped in the fixing mechanism to be tensioned to meet the testing requirements. The tensioning test device can be applied to test objects such as booms. By providing the protective mechanism 5, when the tensioning test device is tested, the folding component 15 in the protective mechanism 5 is in an unfolded state. When the boom breaks, the rebound range of the broken steel wire bundle is reduced, preventing the lower hardness components in the test device from being impacted, thereby reducing the probability of damage to the test device. At the same time, when the staff is cleaning the tensioning test device, the folding component 15 in the protective mechanism 5 is in a folded state, which is convenient for the staff to clean, thereby improving the efficiency of equipment maintenance.

[0049] The structure and shape of the tension test device are described in detail below:

[0050] In the optional solution of the embodiment of the present utility model, see Figure 2 and Figure 3 The folding assembly 15 includes two baffles 22 and a connecting shaft 23; the two baffles 22 are arranged along the width direction of the main board 1, and the two baffles 22 are rotatably connected to each other on one side through the connecting shaft 23, and the two ends of the other side are slidably connected to the support frame 10 through a sliding assembly.

[0051] Specifically, in this embodiment, the baffle 22 is made of acrylic. The advantages of acrylic include: high transparency and a crystal-like appearance, with a light transmittance exceeding 92%, comparable to the transparency of ordinary glass, and excellent visual effects; excellent processing properties, and the ability to be cut, drilled, engraved, bent, and processed to meet various designs and requirements; excellent weather resistance and aging resistance, preventing yellowing or discoloration even after prolonged outdoor use; high strength, hardness, and wear resistance, allowing it to withstand certain impacts and compression; and the fact that acrylic is recyclable and environmentally friendly. Furthermore, acrylic does not produce harmful substances during manufacturing and use, harmless to the environment and human health; and compared to glass, acrylic is lighter and easier to transport and install.

[0052] The folding assembly 15 includes two baffles 22 and a connecting shaft 23. The two baffles 22 are rotatably connected via the connecting shaft 23. The baffles 22 prevent waste from splashing.

[0053] In the optional solution of the embodiment of the present utility model, see Figure 2 The sliding assembly includes a slider 12, a fixed plate 13, a rotating shaft 14 and a slide groove 11 provided on the support frame 10. The slider 12 is installed in the slide groove 11 and slides with the slide groove 11. The slider 12 is used to connect to an external power source; the slider 12 is installed with a fixed plate 13, and the rotating shaft 14 is provided in the fixed plate 13. The baffle 22 is connected to the rotating shaft 14.

[0054] Specifically, in this embodiment, a plurality of folding components 15 are installed between two adjacent support frames 10, and the plurality of folding components 15 are arranged along the axial direction of the support frame 10; a slide groove 11 is provided inside the support frame 10, and a plurality of sliders 12 are installed inside the slide groove 11, and the plurality of sliders 12 are symmetrically distributed about the center line of the main board 1, and the plurality of sliders 12 are all externally connected to a power source, and a fixed plate 13 is fixedly installed on the surface of the plurality of sliders 12, a rotating shaft 14 is provided inside the fixed plate 13, and a baffle 22 is provided on the outer surface of the rotating shaft 14.

[0055] The slider 12 drives the folding assembly 15 on the fixed plate 13 to unfold, which can protect the staff and the test device from external interference and potential damage. After the test is completed, the slider 12 drives the fixed folding assembly 15 to fold, making it easier for the staff to clean the equipment.

[0056] In an optional solution of the embodiment of the present invention, the fixing mechanism includes two fixing components 8 arranged opposite to each other along the width direction of the main board 1. The two fixing components 8 are both connected to the transmission mechanism in a transmission manner, and a clamping area is formed between the two fixing components 8.

[0057] Specifically, the two fixing components 8 are symmetrically distributed about the center line of the main board 1, and the clamping area is a circle that matches the cross-sectional shape of the suspension rod, so as to increase the contact area between the clamping area and the suspension rod and enhance the clamping strength.

[0058] The clamping area is used to clamp the object to be measured.

[0059] In the optional solution of the embodiment of the present utility model, see Figure 4 The fixing assembly 8 includes a clamping plate 18, an arc-shaped plate 9 and a second telescopic rod 20. The clamping plate 18 is connected to the transmission mechanism. The cross-section of the arc-shaped plate 9 is arc-shaped and is connected to the clamping plate 18 through the second telescopic rod 20 to drive the arc-shaped plate 9 to move toward or away from the clamping plate 18; the arc-shaped plates 9 of the two fixing assemblies 8 are arranged opposite to each other to form a clamping area.

[0060] Specifically, the arc-shaped plate 9 is fixedly connected to the end surface of the second telescopic rod 20 .

[0061] The second telescopic rod 20 pushes the arc-shaped plate 9 to fix or loosen the boom to be tested.

[0062] In an optional solution of the embodiment of the present utility model, a sleeve 19 is fixedly mounted on the inner wall of the clamping plate 18 , and the second telescopic rod 20 is mounted in the sleeve 19 .

[0063] Specifically, see Figure 5 , multiple sleeves 19, second telescopic rods 20 and arc-shaped plates 9 are provided, multiple sleeves 19 are symmetrically distributed about the center line of the clamping plate 18, multiple second telescopic rods 20 are installed one-to-one with multiple sleeves 19, and multiple arc-shaped plates 9 are installed one-to-one with multiple second telescopic rods 20.

[0064] The sleeve 19 protects the second telescopic rod 20 and can guide the second telescopic rod 20 .

[0065] In an optional solution of the embodiment of the present invention, an elastic member 21 is provided on the outer cover of the second telescopic rod 20 , and two ends of the elastic member 21 are respectively in contact with the arc plate 9 and the clamping plate 18 .

[0066] Specifically, the elastic member 21 is configured as a spring, and both ends of the spring abut against the arc plate 9 and the clamping plate 18 respectively.

[0067] The spring cooperates with the second telescopic rod 20 to reduce shaking when the boom breaks, thereby reducing the probability of damage to the testing device.

[0068] In an optional solution of an embodiment of the present invention, the fixing assembly 8 also includes a movable plate 16 and a first telescopic rod 17; the movable plate 16 is connected to the transmission mechanism and is connected to the clamping plate 18 through the first telescopic rod 17 to drive the clamping plate 18 to move toward or away from the movable plate 16.

[0069] Specifically, the movable plate 16 is provided with a connection hole with an internal thread, and the connection hole is used for threaded connection with the double-headed screw 7; by rotating the double-headed screw 7, the movable plate 16 moves along the axial direction of the double-headed screw 7.

[0070] The movable plate 16 is threadedly connected to the stud screw 7 and fixedly mounted with a first telescopic rod 17. A clamping plate 18 is fixedly mounted on the end of the first telescopic rod 17 away from the movable plate 16. The first telescopic rod 17 pushes the clamping plate 18 away from the movable plate 16, while the second telescopic rod 20 pushes the curved plate 9 to squeeze the suspension rod, securing it between the two clamping plates 18. The second telescopic rod 20 enables the tension test device to secure suspension rods of different sizes, expanding the test device's applicability.

[0071] In an optional scheme of an embodiment of the present utility model, the main board 1 is provided with two rotation grooves 6, both of which are located in the support frame 10 and are spaced apart along the width direction of the main board 1; the transmission mechanism includes two double-headed screws 7, the double-headed screws 7 are installed in the rotation grooves 6, and the fixing assembly 8 is installed on the double-headed screws 7 and is threadedly engaged with the double-headed screws 7.

[0072] Specifically, two rotation grooves 6 are provided on the upper surface of the mainboard 1 corresponding to the support frame 10, and the two rotation grooves 6 are symmetrically distributed about the center line of the mainboard 1; a double-headed screw 7 is rotatably installed in the rotation groove 6, and the double-headed screw 7 is threadedly connected to the movable plate 16.

[0073] The double-headed screw 7 is used to control the movement of the fixing device along the length direction of the main board 1, thereby achieving tensioning of the suspension rod.

[0074] In an optional solution of the embodiment of the present utility model, the end of the double-headed screw 7 is connected to a driving member 24.

[0075] Specifically, in this embodiment, the driving member 24 is configured as a motor.

[0076] A motor is provided on the side of the main board 1 corresponding to the double-headed screw 7. The double-headed screw 7 passes through the main board 1 and is fixedly connected to the output end of the motor. The motor serves as a power source for the double-headed screw 7 and provides power for the double-headed screw 7.

[0077] In an optional scheme of an embodiment of the present utility model, at least four brackets 2 are fixedly installed on the lower surface of the mainboard 1, and the at least four brackets 2 are symmetrically distributed about the center line of the mainboard 1, and the mainboard 1 is fixed to the ground by the brackets 2; two placement grooves 3 are provided on the upper surface of the mainboard 1 and are spaced apart along the width direction of the mainboard 1, and placement plates 4 are provided inside the two placement grooves 3, and the two ends of the support frame 10 are respectively connected to the two placement plates 4; the placement plates 4 cooperate with the placement grooves 3 so that when the equipment is maintained, the staff can use the placement plates 4 to remove the protective mechanism 5 from the test device.

[0078] The working principle of the tension test device is described in detail below:

[0079] The slider 12 drives the folding assembly 15 on the fixed plate 13 to fold. The staff uses the motor to move the movable plate 16 on the stud screw 7 to the appropriate position according to the length of the boom. The first telescopic rod 17 pushes the clamping plates 18 closer to each other. At the same time, the first telescopic rod 17 pushes the arc plate 9 to fix the boom. The slider 12 drives the folding assembly 15 on the fixed plate 13 to unfold, and the stud screw 7 drives the movable plate 16 to be tensioned.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tension testing device, characterized in that: include: Main board (1), protection mechanism (5), fixing mechanism and transmission mechanism; The protection mechanism (5) comprises a plurality of support frames (10) spaced apart along the length direction of the main board (1), both ends of the support frames (10) being mounted on the main board (1), a folding assembly (15) being mounted between two adjacent support frames (10), and the folding assembly (15) having a folded state and an unfolded state; The fixing mechanism is provided with a clamping area for clamping the object to be measured, and the fixing mechanism is located between the main board (1) and the support frame (10); The transmission mechanism is in transmission connection with the fixing mechanism to drive the fixing mechanism to move back and forth along the length direction of the main board (1).

2. The tension testing device according to claim 1, characterized in that: The folding assembly (15) includes two baffles (22) and a connecting shaft (23); The two baffles (22) are arranged along the width direction of the main board (1); the two baffles (22) are rotatably connected on one side close to each other via the connecting shaft (23), and both ends of the other side are slidably connected to the support frame (10) via a sliding assembly.

3. The tension testing device according to claim 2, characterized in that: The sliding assembly comprises a slider (12), a fixing plate (13), a rotating shaft (14) and a slide groove (11) provided on the support frame (10); the slider (12) is installed in the slide groove (11) and slides with the slide groove (11); the slider (12) is used to be connected to an external power source; The slider (12) is installed with a fixed plate (13), a rotating shaft (14) is provided in the fixed plate (13), and the baffle (22) is connected to the rotating shaft (14).

4. The tension testing device according to claim 1, characterized in that: The fixing mechanism comprises two fixing assemblies (8) arranged opposite to each other along the width direction of the main board (1); the two fixing assemblies (8) are both connected to the transmission mechanism in a transmission manner, and the clamping area is formed between the two fixing assemblies (8).

5. The tension testing device according to claim 4, characterized in that: The fixing assembly (8) includes a clamping plate (18), an arc-shaped plate (9) and a second telescopic rod (20); the clamping plate (18) is in transmission connection with the transmission mechanism; the arc-shaped plate (9) has an arc-shaped cross section and is connected to the clamping plate (18) via the second telescopic rod (20) to drive the arc-shaped plate (9) to move toward or away from the clamping plate (18); The arc-shaped plates (9) of the two fixing assemblies (8) are arranged opposite to each other to form the clamping area.

6. The tension testing device according to claim 5, characterized in that: A sleeve (19) is fixedly mounted on the inner wall of the clamping plate (18), and the second telescopic rod (20) is mounted in the sleeve (19).

7. The tension testing device according to claim 6, characterized in that: The outer cover of the second telescopic rod (20) is provided with an elastic member (21), and the two ends of the elastic member (21) are respectively in contact with the arc plate (9) and the clamping plate (18).

8. The tension testing device according to claim 5, characterized in that: The fixing assembly (8) further comprises a movable plate (16) and a first telescopic rod (17); The movable plate (16) is in transmission connection with the transmission mechanism and is connected to the clamping plate (18) via the first telescopic rod (17) to drive the clamping plate (18) to move toward or away from the movable plate (16).

9. The tension testing device according to claim 4, characterized in that: The main board (1) is provided with two rotation grooves (6), and the two rotation grooves (6) are both located in the support frame (10) and are spaced apart along the width direction of the main board (1); The transmission mechanism comprises two double-headed screws (7), the double-headed screws (7) are installed in the rotating groove (6), and the fixing assembly (8) is installed on the double-headed screws (7) and is threadably matched with the double-headed screws (7).

10. The tension testing device according to claim 9, characterized in that: The end of the double-headed screw (7) is connected to a driving member (24).

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