A multi-wired static-dynamic stress strain testing mechanism and its operation method

Abstract

This invention discloses an auxiliary multi-wire static and dynamic stress-strain testing mechanism, comprising a pull rod, a screwdriver box, screwdrivers, a stress-strain tester, and a connecting rod. The screwdriver boxes, mounted on the stress-strain tester and positioned above several screws to be tightened, are fixed to a base vertical plate. The lower end of the base vertical plate rests on the upper surface of the stress-strain tester. Screwdrivers are respectively mounted under the screwdriver boxes. One end of the pull rod is mounted on the screwdriver box and drives the screwdrivers to rotate via a gear linkage mechanism within the screwdriver box; the other end of the pull rod is mounted on the connecting rod. This invention also discloses a construction method for the auxiliary multi-wire static and dynamic stress-strain testing mechanism. This invention, an auxiliary multi-wire static and dynamic stress-strain testing mechanism and its operating method, can effectively improve the efficiency of screw fixing and the accuracy of wiring, effectively avoid wire stripping, and offers good accuracy and safety. It is also simple to operate and convenient to use.

Description

Technical Field

[0001] This invention relates to the field of wiring technology for stress and strain testers, specifically to a multi-wire static and dynamic stress and strain testing mechanism and its operation method. Background Technology

[0002] A stress-strain tester is a testing device used to assess the strength and fatigue characteristics of a product structure. When taking the stress-strain tester to the field, wiring is required first, which involves connecting the wires to the screws on each channel of the tester. Due to the large amount of data to be measured, a significant amount of wiring is necessary. While traditional manual screwdrivers are simple, compact, and easy to carry, their low efficiency—only one screw can be tightened at a time—leads to a significant time commitment for wiring the tester, and the constant need to manage the wires further increases the workload. Electric screwdrivers, while less strenuous, are unsuitable for instrument wiring and require a power source, making them unsuitable for field work. Furthermore, the use of electric screwdrivers can cause screw stripping, potentially damaging the measurement channels.

[0003] Therefore, it is essential to develop a device for wiring operations of stress-strain testers that can improve wiring efficiency and stability without the need for electricity, and is less prone to stripping. Summary of the Invention

[0004] The purpose of this invention is to provide an auxiliary multi-wire static and dynamic stress-strain testing mechanism and its operation method to solve the above-mentioned defects.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A mechanism for assisting in multi-wire static and dynamic stress-strain testing includes: a pull rod, a screwdriver box, screwdrivers, a stress-strain tester, and a connecting rod. Several pull rods, screwdriver boxes, and screwdrivers are provided. Several screws to be tightened are provided on the stress-strain tester. Several screwdriver boxes are respectively placed above the screws to be tightened and fixed to a base vertical plate. The lower end of the base vertical plate rests on the upper surface of the stress-strain tester on one side of the screws to be tightened. Several screwdrivers are respectively installed under the screwdriver boxes. One end of each pull rod is correspondingly installed on a screwdriver box and drives the screwdrivers to rotate via a gear linkage mechanism within the screwdriver box. The other ends of the pull rods are all installed on the connecting rod.

[0007] Preferably, the lower end of the base vertical plate is provided with a notch, a U-shaped buckle is installed in the notch and a wire is connected to it by soldering, and the front end of the U-shaped buckle is sleeved on the screw to be tightened.

[0008] Preferably, the gear linkage mechanism includes: a cylindrical gear, a spring II, a driven gear, and a driving gear. The cylindrical gear and the driven gear are both installed inside the screwdriver box. The upper end of the screwdriver is installed through a bearing at the bottom of the screwdriver box. The driven gear is installed inside the screwdriver box and sleeved on the upper end of the screwdriver. Multiple springs II are provided, and the upper and lower ends of the springs II are respectively movably connected to the driven gear and the bottom of the screwdriver box. The cylindrical gear is installed at the bottom of the screwdriver box through a bearing. The driving gear is sleeved on the outside of the cylindrical gear, and the driving gear meshes with the driven gear. A serrated slide rail is provided on the lower end face of the pull rod, and the serrated slide rail at one end of the pull rod meshes with the top end of the cylindrical gear.

[0009] Preferably, the screwdriver box is provided with a cover plate on the top, and a reserved hole is provided on the upper surface of the cover plate, and the upper end of the cylindrical gear is inserted through the reserved hole of the cover plate.

[0010] Preferably, each screwdriver box is provided with a screwdriver cap on its upper part. The lower end face of the screwdriver cap is provided with an opening that extends through its interior. The front and rear outer walls of the screwdriver cap are provided with sliding holes that extend through their interiors. A sliding plate is provided through several sliding holes arranged in a straight line. Several limiting holes are provided on the sliding plate. A limiting post is provided on the top of the screwdriver cap that extends through its interior. An anti-slip limiting plate is provided on the limiting post on the outer side of the top of the screwdriver cap. The lower end of the limiting post is inserted into the limiting hole of the sliding plate.

[0011] Preferably, the screwdriver cap has circular snap-fit ​​holes on both the left and right outer walls, and a snap-fit ​​post is provided in the center of the upper upper surface of the cover plate. Circular snap-fits are provided on the left and right outer walls of the snap-fit ​​post. The snap-fit ​​post is inserted into the screwdriver cap from bottom to top, and the circular snap-fits are embedded in the circular snap-fit ​​holes.

[0012] Preferably, the sliding plate has a raised fixing baffle at its front end and a spring mounting groove at its rear end. A spring I is installed in the spring mounting groove, and a spring baffle is provided on the top of the spring I.

[0013] Preferably, the side end face of the connecting rod is provided with a plurality of connecting holes, and the other ends of the plurality of pull rods are respectively installed in the plurality of connecting holes of the connecting rod; a pull ring is installed on the connecting rod, and the pull rod and screwdriver are rotated by pulling the pull ring.

[0014] Preferably, the base vertical plate is a U-shaped structure, and the U-shaped base vertical plate is placed directly on the upper surface of the stress-strain tester, or fixed to the upper surface of the stress-strain tester by brackets and bolts.

[0015] An operating method for an auxiliary multi-wire static and dynamic stress-strain testing mechanism includes the following steps:

[0016] S1. Assembly of the screwdriver box:

[0017] First, determine the type and quantity of screwdrivers to be installed, and install the tops of each screwdriver through bearings at the bottom of the screwdriver box. Second, install the driven gear on the top of the screwdriver, and install several springs II under the driven gear. Then, sleeve the driving gear on the outside of the cylindrical gear and mesh the driving gear with the driven gear. Next, close the top of the screwdriver box with the cover plate, leaving the top of the cylindrical gear protruding from the pre-drilled hole in the cover plate. Finally, mesh the serrated slide rail at one end of the pull rod with the top of the cylindrical gear.

[0018] S2. Overall assembly:

[0019] After the screwdriver box is assembled, first, install the screwdriver caps one by one on the cover plate of the screwdriver box, and insert the round buckles of the cover plate into the round buckle holes of the screwdriver caps; then, insert the sliding plate through the sliding holes of several screwdriver caps in a straight line, and adjust the spacing of several screwdriver boxes and screwdrivers according to the spacing between the screws to be tightened; then, insert the limiting pins from the top of the screwdriver caps into their interiors, and insert the lower end of the limiting pins into the limiting holes of the sliding plate to ensure that the screwdriver box and screwdrivers remain stable and do not shift; finally, install the ends of the pull rods one by one into the several connecting holes of the connecting rod, thus completing the overall assembly of the screwdriver mechanism;

[0020] S3, Testing mechanism wiring:

[0021] First, place the screwdriver mechanism above the stress-strain tester, ensuring the screwdriver aligns with the screw to be tightened. Then, lift the washer fitted onto the screw to be tightened on the stress-strain tester. Next, insert a U-shaped clip with a welded wire into the recess of the base plate, ensuring the front end of the U-shaped clip engages with the screw to be tightened. Finally, align the screwdriver with the screw to be tightened and pull the pull ring to move the pull rod linearly, causing the drive gear and driven gear to rotate sequentially. During the rotation of the driven gear, spring II gradually tilts and twists from a vertical position, pulling the driven gear and screwdriver to rotate while simultaneously moving downwards, thus simultaneously fixing several screws to be tightened.

[0022] The beneficial effects of this invention are as follows:

[0023] This invention discloses an auxiliary multi-wire static and dynamic stress-strain testing mechanism. It features a compact structure, is adaptable to different types and numbers of screwdrivers, and allows for synchronous rotation of all screwdrivers by pulling a pull ring. This effectively improves screw fixing efficiency and wiring accuracy, preventing wire stripping. Simultaneously, it ensures screw perpendicularity during tightening, allowing operators unfamiliar with screwdrivers to quickly learn and improve wiring accuracy and safety. The invention also provides a simple and convenient operating method for the auxiliary multi-wire static and dynamic stress-strain testing mechanism. Attached Figure Description

[0024] Figure 1 : A schematic diagram of the structure of the auxiliary multi-wire static and dynamic stress and strain testing mechanism of the present invention;

[0025] Figure 2 : A schematic diagram of the structure of the pull rod and screwdriver box of the present invention;

[0026] Figure 3 : A schematic diagram of the stress-strain testing instrument of the present invention;

[0027] Figure 4 : A schematic diagram of the screwdriver cap of the present invention;

[0028] Figure 5 : A schematic diagram of the sliding rod of the present invention;

[0029] Figure 6 : A schematic diagram of the connecting rod of the present invention. Detailed Implementation

[0030] The present invention will be further described below with reference to the embodiments. It should be noted that these are merely examples and descriptions of the inventive concept. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the inventive concept or exceed the scope defined in the claims, they should all be considered to fall within the protection scope of the present invention.

[0031] Example 1:

[0032] Figure 1 This is a schematic diagram of the structure of an auxiliary multi-wire static and dynamic stress-strain testing mechanism according to an embodiment of the present invention. Figure 1As shown, a mechanism for assisting in multi-wire static and dynamic stress-strain testing includes: a pull rod 4, a screwdriver box 5, screwdrivers 6, a stress-strain testing instrument 7, and a connecting rod 9. Several pull rods 4, screwdriver boxes 5, and screwdrivers 6 are provided and correspond one-to-one. The screwdriver box 5 is installed above the stress-strain testing instrument 7, and the screwdrivers 6 are installed below the screwdriver box 5. One end of the pull rod 4 is installed on the screwdriver box 5 and controls the rotation of the screwdrivers 6; the other end is fixed to the connecting rod 9.

[0033] like Figure 1 , 2 As shown in Figure 3, the stress-strain tester 7 has several equally spaced screws 72 to be tightened, each screw 72 fitted with a washer 71. Several screwdriver boxes 5 are placed above the screws 72 and fixed to the base vertical plate 52, with the lower end of the base vertical plate 52 resting on the upper surface of the stress-strain tester 7 on one side of the screws 72. The base vertical plate 52 has a U-shaped structure, which is directly placed on the upper surface of the stress-strain tester 7. The U-shaped base vertical plate 52 ensures a certain degree of stability for the entire screwdriver mechanism (including the pull rod 4, screwdriver boxes 5, screwdrivers 6, connecting rods 9, etc.). The U-shaped base vertical plate 52 can also be fixed to the upper surface of the stress-strain tester 7 by brackets and bolts, further enhancing the stability of the entire screwdriver mechanism.

[0034] A recess 10 is provided at the lower end of the base vertical plate 52. A U-shaped buckle 8 is installed in the recess 10 of the base vertical plate 52 and a wire is connected to it by soldering. The front end of the U-shaped buckle 8 is sleeved on the screw 72 to be tightened, which is used to connect and transmit electrical signals to the stress-strain tester 7. After connecting and installing several screws 72 to be tightened and wires using the entire auxiliary multi-wire static and dynamic stress-strain testing mechanism, the entire screwdriver mechanism above the stress-strain tester 7 can be directly removed without being affected by the installed U-shaped buckle 8 and wires.

[0035] like Figure 1 , 2 As shown in Figure 4, several screwdriver boxes 5 are placed above the screws 72 to be tightened and fixed on the base vertical plate 52. Several screwdrivers 6 are installed under several screwdriver boxes 5. One end of the pull rod 4 is installed on the screwdriver box 5 in a corresponding manner, and the screwdrivers 6 are driven to rotate through the gear linkage mechanism set in the screwdriver box 5.

[0036] The gear linkage mechanism includes: a cylindrical gear 42, a spring II 55, a driven gear 56, and a driving gear 57. The cylindrical gear 42 and the driven gear 56 are both installed inside the screwdriver box 5. The upper end of the screwdriver 6 is installed through a bearing at the bottom of the screwdriver box 5. The driven gear 56 is installed inside the screwdriver box 5 and sleeved on the upper end of the screwdriver 6. Multiple springs II 55 are provided, and the upper and lower ends of the springs II 55 are respectively movably connected to the driven gear 56 and the bottom of the screwdriver box 5. The cylindrical gear 42 is installed at the bottom of the screwdriver box 5 through a bearing. The driving gear 57 is sleeved on the outside of the cylindrical gear 42, and the driving gear 57 meshes with the driven gear 56. A serrated slide rail 41 is provided on the lower end face of the pull rod 4, and the serrated slide rail 41 at one end of the pull rod 4 meshes with the top end of the cylindrical gear 42.

[0037] The screwdriver box 5 has a cover plate 53 on top, and a pre-drilled hole 531 on the upper surface of the cover plate 53. The upper end of the cylindrical gear 42 is inserted through the pre-drilled hole 531 in the cover plate 53. The lower surface of the pull rod 4 has a serrated slide rail 41, and the serrated slide rail 41 at one end of the pull rod 4 is fitted onto the top end of the cylindrical gear 42 that is exposed on the cover plate 53.

[0038] Each screwdriver box 5 is equipped with a screwdriver cap 2 on its top. The lower end face of the screwdriver cap 2 has an opening that extends through its interior. The left and right outer walls of the screwdriver cap 2 are each equipped with a circular snap-fit ​​hole 23 that extends through its interior. The upper end face of the cover plate 53 is equipped with a snap-fit ​​post 54 in the center. The left and right outer walls of the snap-fit ​​post 54 are equipped with circular snap-fits 541. The snap-fit ​​post 54 is inserted into the screwdriver cap 2 from bottom to top, and the circular snap-fits 541 are embedded into the circular snap-fit ​​holes 23, thereby realizing the connection and fixation between the screwdriver box 5 and the screwdriver cap 2.

[0039] The screwdriver cap 2 has sliding holes 24 penetrating its interior on both the front and rear outer walls, and a sliding plate 1 is inserted through several sliding holes 24 arranged in a straight line. Figure 5 As shown, the sliding plate 1 has a raised fixing baffle 12 at its front end and a spring mounting groove at its rear end. A spring I 31 is installed in the spring mounting groove, and a spring baffle 3 is installed on top of the spring I 31. Thus, by pressing the spring baffle 3, the spring I 31 can be retracted, thereby achieving the function of loading and unloading the number of screwdriver caps 2 in series. Several limiting holes 11 are evenly spaced on the sliding plate 1. A limiting post 21 penetrating through the top of the screwdriver cap 2 is provided. An anti-slip limiting plate 22 is provided on the limiting post 21 on the outer side of the top of the screwdriver cap 2. The lower end of the limiting post 21 is inserted into the limiting hole 11 of the sliding plate 1. The anti-slip limiting plate 22 can prevent the limiting post 21 from falling off during use.

[0040] like Figure 6As shown, the side end face of the connecting rod 9 is provided with several connecting holes 91, and the other ends of several pull rods 4 are respectively installed in several connecting holes 91 of the connecting rod 9; a pull ring 92 is installed on the connecting rod 9, and the pull rod 4 and screwdriver 6 are rotated by pulling the pull ring 92.

[0041] To ensure the efficient connection and fixation of the screws 72 to be tightened with the wires, an elastic device can be installed at the bottom of the base vertical plate 52. The elastic device can be composed of several springs, which can make the entire screwdriver mechanism have a certain vertical displacement under the action of external force, thereby facilitating the contact between the screwdriver 6 and the screws 72 to be tightened, and making it easier to tighten and install the screws 72.

[0042] An operating method for an auxiliary multi-wire static and dynamic stress-strain testing mechanism includes the following steps:

[0043] S1. Assembly of the screwdriver box:

[0044] First, determine the type and quantity of screwdrivers 6 to be installed, and install the top of each screwdriver 6 through bearings at the bottom of the screwdriver box 5. Second, install the driven gear 56 on the top of the screwdriver 6, and install multiple springs II 55 under the driven gear 56. Then, sleeve the driving gear 57 on the outside of the cylindrical gear 42 and mesh the driving gear 57 with the driven gear 56. Next, close the top of the screwdriver box 5 with the cover plate 53, and expose the top of the cylindrical gear 42 through the reserved hole 531 in the cover plate 53. Finally, mesh the serrated slide rail 41 at one end of the pull rod 4 with the top of the cylindrical gear 42.

[0045] S2. Overall assembly:

[0046] After the screwdriver box is assembled, firstly, install the screwdriver caps 2 one by one on the cover plate 53 of the screwdriver box 5, and insert the round buckles 541 of the buckle pins 54 of the cover plate 53 into the round buckle holes 23 of the screwdriver caps 2; then, insert the sliding plate 1 through the sliding holes 24 of several screwdriver caps 2 in a straight line, and then insert the limiting pins 21 one by one from the top of the screwdriver caps 2 into their interior, and insert the lower end of the limiting pins 21 into the limiting holes 11 of the sliding plate 1 to ensure that the screwdriver box 5 and the screwdrivers 6 remain stable and do not shift; finally, install the ends of the pull rods 4 one by one into several connecting holes 91 of the connecting rods 9, thereby completing the overall assembly of the screwdriver mechanism.

[0047] S3, Testing mechanism wiring:

[0048] First, place the screwdriver mechanism above the stress-strain tester 7, ensuring that the screwdriver 6 corresponds to the position of the screw 72 to be tightened. Then, lift the washer 71 fitted on the screw 72 to be tightened on the stress-strain tester 7. Next, insert the U-shaped buckle 8 with the welded wire installed into the recess 10 of the base vertical plate 52, so that the front end of the U-shaped buckle 8 fits onto the screw 72 to be tightened. Finally, align the screwdriver 6 with the screw 72 to be tightened, and pull the pull ring 92 to drive the pull rod 4 to move linearly, causing the drive gear 57 and driven gear 56 to rotate in sequence. During the rotation of the driven gear 56, the spring II 55 gradually begins to tilt and twist from a vertical state, pulling the driven gear 56 and the screwdriver 6 to rotate while moving downwards, thereby completing the synchronous fixing of several screws 72 to be tightened.

[0049] This invention discloses an auxiliary multi-wire static and dynamic stress-strain testing mechanism with a compact structure. A screwdriver box 5 can hold different types and quantities of screwdrivers 6, which are connected in series with screwdriver caps 2, effectively accelerating the fixing of screws 72 to be tightened. Pulling the pull ring 92 enables synchronous rotation of all screwdrivers 6, effectively improving the efficiency of fixing screws 72 and the accuracy of wiring, effectively preventing stripping of wires. Simultaneously, it effectively ensures the perpendicularity of the screws during tightening, allowing operators without screwdriver experience to quickly learn and improve wiring accuracy and safety. Lifting the washer 71 ensures that the U-shaped clip 8 can perfectly contact the washer 71 during wiring, transmitting a stable electrical signal and ensuring the stability and accuracy of data during monitoring.

[0050] This invention provides an operating method for an auxiliary multi-wire static and dynamic stress-strain testing mechanism, which is simple to operate and easy to use.

[0051] The above is an exemplary description of the invention. Obviously, the specific implementation of the invention is not limited to the above-described manner. Any non-substantial improvement made using the inventive concept and technical solution of the invention, or the direct application of the inventive concept and technical solution to other situations without modification, is within the protection scope of the invention.

Claims

1. A device for assisting a multi-wire static-dynamic stress strain testing mechanism, characterized by, Include: Pull rod (4), screwdriver box (5), screwdriver (6), stress strain tester (7), connecting rod (9), the pull rod (4), screwdriver box (5), screwdriver (6) are provided with several; The stress strain tester (7) is provided with several to be tightened screws (72), several screwdriver boxes (5) are respectively placed above the to be tightened screws (72) and are respectively fixed on the base vertical plate (52), the lower end of the base vertical plate (52) is placed on the upper surface of the stress strain tester (7) on the side of the to be tightened screw (72), several screwdrivers (6) are respectively installed below the screwdriver box (5), one end of the pull rod (4) is correspondingly installed on the screwdriver box (5), and the rotation of the screwdriver (6) is driven by the gear linkage mechanism arranged in the screwdriver box (5), the other end of the pull rod (4) is installed on the connecting rod (9); The lower end of the base vertical plate (52) is provided with a notch (10), the U-shaped buckle (8) is installed in the notch (10) and is connected with a lead wire by soldering, and the U-shaped buckle (8) is sleeved on the to be tightened screw (72); The gear linkage mechanism comprises: a cylindrical gear (42), a spring II (55), a driven gear (56) and a driving gear (57), the cylindrical gear (42) and the driven gear (56) are installed in the screwdriver box (5), the upper end of the screwdriver (6) is installed in the bottom of the screwdriver box (5) through a bearing, and the driven gear (56) is installed in the screwdriver box (5) and sleeved on the upper end of the screwdriver (6); The spring II (55) is provided with a plurality of spring II (55), and the upper and lower ends of the spring II (55) are movably connected to the driven gear (56) and the bottom of the screwdriver box (5) respectively; The cylindrical gear (42) is installed in the bottom of the screwdriver box (5) through a bearing, the driving gear (57) is sleeved on the outside of the cylindrical gear (42), and the driving gear (57) is engaged with the driven gear (56); The lower end surface of the pull rod (4) is provided with a sawtooth slide rail (41), and the sawtooth slide rail (41) at one end of the pull rod (4) is engaged with the top end of the cylindrical gear (42).

2. A mechanism for assisting multi-wiring electro-thermal stress-strain test according to claim 1, characterized in that, The top of the screwdriver box (5) is provided with a cover plate (53), the upper end surface of the cover plate (53) is provided with a reserved hole (531), and the upper end of the cylindrical gear (42) is arranged in the reserved hole (531) of the cover plate (53).

3. A multi-wired static-dynamic stress-strain test mechanism according to claim 2, wherein The screwdriver box (5) is provided with a screwdriver cap (2) above, the lower end face of the screwdriver cap (2) is provided with an opening and penetrates its inside, the front and rear outer walls of the screwdriver cap (2) are provided with sliding holes (24) penetrating its inside, a plurality of sliding holes (24) are distributed in a straight line, the sliding plate (1) is provided with a plurality of limiting holes (11), the top of the screwdriver cap (2) is provided with a limiting column (21) penetrating its inside, the limiting column (21) on the top of the outer side of the screwdriver cap (2) is provided with an antiskid limiting plate (22), and the lower end of the limiting column (21) is inserted into the limiting hole (11) of the sliding plate (1).

4. A multi-wired static-dynamic stress-strain test mechanism according to claim 3, wherein The left and right outer walls of the screwdriver cap (2) are provided with circular buckle holes (23) penetrating its inside, the upper end face of the cover plate (53) is provided with a buckle column (54) in the center, the left and right outer walls of the buckle column (54) are provided with circular buckles (541), the buckle column (54) is inserted into the inside of the middle screwdriver cap (2) from bottom to top, and the circular buckle (541) is embedded into the circular buckle hole (23).

5. A multi-wired static-dynamic stress-strain test mechanism according to claim 4, wherein The front end of the sliding plate (1) is provided with a protruding fixed baffle (12), the rear end is provided with a spring mounting groove, the spring I (31) is mounted in the spring mounting groove, and the spring I (31) is provided with a spring baffle (3) on the top.

6. A multi-wired static-dynamic stress-strain test mechanism according to claim 5, wherein The side end face of the connecting rod (9) is provided with a plurality of connecting holes (91), and the other ends of a plurality of the pull rods (4) are respectively mounted in the connecting holes (91) of the connecting rod (9); the connecting rod (9) is provided with a pull ring (92), and the rotation of the pull rod (4) and the screwdriver (6) is driven by pulling the pull ring (92).

7. A multi-wired static-dynamic stress-strain test mechanism according to claim 6, wherein The base vertical plate (52) is a U-shaped structure, and the U-shaped structure base vertical plate (52) is directly placed on the upper surface of the stress strain tester (7) or fixed on the upper surface of the stress strain tester (7) through a support and a bolt.

8. A method for assisting the operation of a multi-wiring static-dynamic stress-strain testing mechanism according to claim 7, characterized in that, The method comprises the following steps: S1, assembling of the screwdriver box: Firstly, the types and required number of screwdrivers (6) to be installed are determined, and the top of the screwdriver (6) is penetrated and mounted in the bottom of the screwdriver box (5) through a bearing; secondly, the driven gear (56) is mounted at the top of the screwdriver (6), a plurality of spring II (55) are mounted below the driven gear (56), the driving gear (57) is sleeved outside the cylindrical gear (42), and the driving gear (57) is engaged with the driven gear (56); then, the cover plate (53) is closed at the top of the screwdriver box (5), and the top of the cylindrical gear (42) is exposed from the reserved hole (531) of the cover plate (53); finally, the sawtooth sliding rail (41) at one end of the pull rod (4) is engaged with the top of the cylindrical gear (42); S2, overall assembly: After the assembling of the screwdriver box is completed, firstly, the screwdriver caps (2) are installed on the cover plate (53) of the screwdriver box (5) one by one, and the round buckle (541) of the buckle column (54) of the cover plate (53) is embedded into the round buckle hole (23) of the screwdriver cap (2); then, the sliding plate (1) is inserted into the sliding hole (24) of the plurality of screwdriver caps (2) in a straight line, the spacing of the plurality of screwdriver boxes (5) and screwdrivers (6) is adjusted according to the spacing between the screws (72) to be tightened, the limiting column (21) is penetrated from the top of the screwdriver cap (2) to the inside of the screwdriver cap (2) one by one, and the lower end of the limiting column (21) is inserted into the limiting hole (11) of the sliding plate (1), so that the screwdriver box (5) and the screwdriver (6) are kept stable and do not deviate; finally, the pull rod (4) is installed in the connecting hole (91) of the connecting rod (9) one by one, so that the overall assembly of the screwdriver mechanism is completed. S3, test mechanism wiring: Firstly, the overall screwdriver mechanism is placed above the stress strain tester (7), and the screwdriver (6) is positioned corresponding to the screw (72) to be tightened, and the gasket (71) sleeved on the screw (72) to be tightened of the stress strain tester (7) is lifted; then, the U-shaped buckle (8) welded with the lead wire is inserted into the notch (10) of the base vertical plate (52), and the front end of the U-shaped buckle (8) is sleeved on the screw (72) to be tightened; finally, the screwdriver (6) is aligned with the screw (72) to be tightened respectively, and the pull ring (92) is pulled to drive the pull rod (4) to move linearly, and the driving gear (57) and the driven gear (56) are rotated in turn, and the spring II (55) gradually starts to tilt and twist from the vertical state in the rotation process of the driven gear (56), the driven gear (56) and the screwdriver (6) are rotated and moved downward at the same time, so that the synchronization fixing of the plurality of screws (72) to be tightened is completed.

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