A tool and method for installing a powerful torsion spring in a confined space

Abstract

The application belongs to the field of mechanical design and assembly, and particularly relates to a strong torsion spring installation tool and method in a narrow space. The strong torsion spring installation tool comprises a bracket, a pressing rod, a compression spring, an end cover, an upper handle, a bolt shaft, a roller, a sliding slot, a fastening screw, a fastening nut and a lower handle. The bracket is of a special-shaped structure, the upper end of the bracket is provided with an ear, and the ear is provided with an ear for being hinged with the upper handle; the other end of the bracket is provided with two fork-shaped structures, and the fork-shaped structures are provided with through holes for being hinged with the lower hook and the upper hook; the upper end of the bracket is provided with a depression, and the depression is provided with a stepped hole through hole for installing the pressing rod, and the lower end surface close to the arc-shaped pressing block is in precise gap cooperation with the pressing rod, so that the movement direction of the pressing rod is ensured to be unchanged. The stepped hole through hole of the bracket is provided with a thread at the upper end for being in thread cooperation with the end cover, so that the pressing rod is limited; meanwhile, the lower end of the bracket is provided with two tension spring hanging holes for hanging the tension spring.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of mechanical design and assembly, and particularly relates to a strong torsion spring installation tool and method in a small space. BACKGROUND

[0002] The installation of torsion springs is often encountered in production and life, and the installation of torsion springs is everywhere in industrial products. For small size and small torsion torsion springs, manual installation is generally not required with the aid of tools, but for large torsion torsion springs often encountered in production, it is difficult to install without the aid of tools or external force, and the labor intensity is large during long-time installation, the hands are greatly worn and damaged, and the installation efficiency is not high. Especially when the installation space of the strong torsion spring is limited, the operation is difficult, or it is difficult to complete the installation work.

[0003] The present application is designed for a very common torsion spring installation tool, the material of the torsion spring is 30CrMnSiA hot rolled annealing, the spring wire diameter is about 2.5mm, and the characteristic of the spring of this material is large stiffness and large installation torsion. As shown in the figure, Figure 1 The installation position of the torsion spring is shown in the figure, the space of the torsion spring installation slot is limited, the two sides of the torsion spring cannot be deeply inserted into the related auxiliary tool, and only the front and rear directions of the torsion spring are assisted to operate. After the torsion spring is changed by a large angle, the pin shaft is inserted through the locking and the installation hole of the torsion spring to complete the installation. The current installation method is to press the spring by hand to deform to install, which has great disadvantages. When the spring is installed, the angle of the torsion spring needs to be pressed on the part matched therewith to change the angle by a large angle. Since the torsion is large, a single hand or a single person cannot complete the installation of the pin, and the pin needs to be repeatedly pressed to smoothly pass through the pin shaft, so the installation efficiency is very low. In addition, when the number of delivery is large at one time, the labor intensity of the workers is large, the hand pain is strong, and the progress is affected. In order to solve the technical problems of large installation difficulty, small installation space and low efficiency of the above-mentioned torsion spring, a tool specially used for the installation of the torsion spring needs to be designed. SUMMARY

[0004] The technical problem to be solved by the present application is:

[0005] The purpose of the present application is to provide a strong torsion spring installation tool and method in a small space to solve the above-mentioned problems in the prior art.

[0006] In order to solve the above-mentioned technical problems, the technical scheme adopted by the present application is:

[0007] The installation tool of the strong torsion spring in the narrow space comprises a bracket, a pressing rod, a pressing spring, an end cover, an upper handle, a bolt shaft, a roller, a rotating shaft, a limiting pin, an arc-shaped pressing block, a lower hook jaw, an upper hook jaw, an upper hook jaw shaft, a lower hook jaw shaft, a pulling spring, a push piece, an L-shaped clamping pin, a sliding slot, a fastening screw, a fastening nut and a lower handle.

[0008] The bracket is a special-shaped structure, the upper end of which is provided with an ear, and the ear is provided with an ear on the ear, which is used for hinging with the upper handle; the other end of the bracket is provided with two fork-shaped structures, and the fork-shaped structures are provided with through holes, which are used for hinging with the lower hook jaw and the upper hook jaw; the upper end of the bracket is provided with a depression, and the depression is provided with a stepped hole through hole, which is used for installing the pressing rod, and the lower end surface close to the arc-shaped pressing block is in precise gap cooperation with the pressing rod, so that the movement direction of the pressing rod is ensured to be unchanged. The stepped hole through hole of the bracket is provided with a thread at the upper end, which is used for being screwed with the end cover to limit the pressing rod; meanwhile, the lower end of the bracket is provided with two pulling spring hanging holes, which are used for hanging the pulling spring.

[0009] The pressing rod is a stepped shaft, one end of which penetrates into the stepped hole through hole of the bracket, and the pressing spring is sleeved on the pressing rod; when the pressing rod is pressed down and the upper handle is released, the pressing spring can make the pressing rod return to the initial position.

[0010] The end cover is a stepped shell part, which is screwed with the stepped hole through hole on the bracket, so as to limit the pressing rod and the pressing spring in the hole and prevent them from escaping; the end cover is provided with a through hole in the center, so that the pressing rod penetrates through, and at the same time, the stepped platform of the pressing rod cannot pass through, so as to limit the continuous upward movement of the pressing rod; the upper end of the end cover is provided with a flat structure, which is used for clamping during screwing.

[0011] The upper handle is a rod-shaped part, the end of which is provided with a through hole, the through hole is concentrically matched with the ear on the ear of the bracket, the rotating shaft penetrates through the through holes of the above two parts to form a rotating pair, so that the upper handle and the bracket can relatively rotate; the lower end of the handle 5 is provided with a support, and the support is provided with a roller mounting hole; a screw hole is arranged near the middle of the upper handle, which is used for fixing and installing the push piece; the bolt shaft penetrates through the through hole of the support and the center hole of the roller to form a rotating pair, so that the roller rotates during pressing to reduce the sliding resistance; the push piece is an arc-shaped toothed part, which is fixedly installed on the threaded hole of the upper handle through the fastening screw.

[0012] The limiting pin is a cylindrical member, which penetrates into the hole of the rotating shaft to prevent the rotating shaft from escaping during use.

[0013] The arc-shaped pressing block is an arc-shaped member, which is fixedly connected to the bottom of the pressing rod, and the installation direction of the arc surface meets that the axis of the arc surface is parallel to the axis of the rotating shaft, so that the arc surface is in close contact with the outer side of the torsion spring installation hole to be installed during use, and the clamping is ensured to be firm.

[0014] The lower and upper hooks have the same structure but different dimensions. One end has a mounting hole, which is hinged to the hole at the end of the fork-shaped structure on the bracket via the upper and lower hook shafts, allowing for relative rotation. The lower ends of the upper and lower hooks have hook-like structures designed to hook onto the upper and lower ends (a and b) of the torsion spring. The middle of the upper and lower hooks has a tension spring mounting hole, with both ends of the tension spring installed in the mounting holes on the bracket and the upper and lower hooks respectively. This allows a small restoring pressure to be applied when the upper and lower hooks are engaged with the a and b ends of the torsion spring, preventing them from falling off.

[0015] The paddle is an arc-shaped component with teeth on its outer arc surface. One end is fixed to the bracket by a fastening screw, while the other end is free. When the upper handle is pressed, the paddle rotates along the pivot. When it rotates to an angle not less than the installation angle of the torsion spring, it pushes the L-shaped locking pin, causing it to slide in the groove. The spiked end of the L-shaped locking pin penetrates into the teeth of the paddle, restricting the upper handle from rebounding and maintaining the opening angle of the torsion spring.

[0016] The groove is a concave component and is fixedly installed on the side of the upper handle.

[0017] The lower handle is a rod-shaped arc-shaped component that generates a reaction force on the hand when the upper handle is pressed down.

[0018] A powerful torsion spring installation tool for use in confined spaces includes a bracket, a pressure rod, a pressure spring, an end cap, an upper handle, a bolt shaft, a roller, a rotating shaft, a limit pin, an arc-shaped pressure block, a lower hook claw, an upper hook claw, an upper hook claw shaft, a lower hook claw shaft, a tension spring, a paddle, an L-shaped locking pin, a slide groove, a fastening screw, a fastening nut, and a lower handle.

[0019] The details are as follows: Figure 1 The diagram shows the structure of the torsion spring to be installed. The torsion spring is made of 30CrMnSiA hot-rolled and annealed material. The characteristics of this torsion spring are high stiffness and large torque. Its upper end is a, its lower end is b, and a mounting hole c is formed in the middle.

[0020] The usage steps are as follows:

[0021] Arrange the torsion spring as follows Figure 4 Install in the following manner. At this time, manually overcome the tension of the tension spring, which requires low stiffness. Open the relative angle of the lower and upper hooks, and lock end a of the torsion spring onto the upper hook and end b onto the lower hook 11. Press the upper handle to make it rotate around the axis of rotation towards the lower handle. Through the action of the roller on the upper end face of the pressure rod, the pressure rod moves downward to bring the arc-shaped pressure block close to the outer arc surface of the mounting hole c of the torsion spring. Continue to press the upper handle to make the pressure rod continue to apply pressure to the torsion spring, so that the angle of the torsion spring opens. The a and b ends of the torsion spring open, causing the upper and lower hooks to rotate around the hook shaft 13 and the lower hook shaft.

[0022] When the torsion spring is opened to an angle no less than the installation angle of the torsion spring, the torsion spring is placed in the position to be assembled by the device, at this time the center shaft of the torsion spring can be easily inserted through the locking and installation hole, and the installation of the torsion spring is realized.

[0023] After the installation of the torsion spring is completed, the lower hook and the upper hook are manually moved to open the relative angle between the two, so that the two ends of the torsion spring are separated, the disassembly of the device is completed, and the torsion spring is firmly fixed in the position to be installed by the restoring force.

[0024] Compared with the prior art, the beneficial effects of the present application are:

[0025] 1. High assembly efficiency. The use of the device for the installation of the torsion spring in a narrow space not only reduces the labor intensity of workers, but also greatly improves the assembly efficiency, and is suitable for batch production.

[0026] 2. Simple to make and low maintenance cost. The device has few components and can be made of common metal materials, so the manufacturing cost and the later maintenance cost are low. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic view of the structure of the torsion spring to be installed;

[0028] Figure 2 is a schematic view of the installation position and state of the torsion spring;

[0029] Figure 3 is a schematic view of the structure of the torsion spring installation device (partially cut);

[0030] Figure 4 is a perspective view of the torsion spring installation device;

[0031] Figure 5 is a schematic view of the structure of the torsion spring after clamping;

[0032] Figure 6 is a schematic view of the structure of the bracket.

[0033] In the figure: 1 - bracket, 2 - pressure rod, 3 - compression spring, 4 - end cover, 5 - upper handle, 6 - bolt shaft, 7 - roller, 8 - rotating shaft, 9 - limit pin, 10 - arc-shaped pressing block, 11 - lower hook, 12 - upper hook, 13 - upper hook shaft, 14 - lower hook shaft, 15 - tension spring, 16 - push piece, 17 - L-shaped locking pin, 18 - sliding groove, 19 - fastening screw, 20 - fastening nut, lower handle 21, a - upper end of torsion spring, b - lower end of torsion spring; c - torsion spring installation hole; d - locking, e - pin. DETAILED DESCRIPTION

[0034] The specific embodiments of the present application will be further described below in combination with the drawings and technical solutions.

[0035] It should be appreciated that the appended drawings are not necessarily drawn to scale, but are merely drawn in a fashion that is sufficient for illustrating the various features of the basic principles of the present application. Specific design features of the present application disclosed herein, including, for example, specific dimensions, orientations, locations and shapes, will be determined in part by the particular intended application and use environment. In the several figures of the drawings, like parts or elements are referenced using the same reference number. EMBODIMENT

[0036] A strong torsion spring installation tool in a narrow space comprises a bracket 1, a pressing rod 2, a compression spring 3, an end cover 4, an upper handle 5, a bolt shaft 6, a roller 7, a rotating shaft 8, a limiting pin 9, an arc-shaped pressing block 10, a lower hook claw 11, an upper hook claw 12, an upper hook claw shaft 13, a lower hook claw shaft 14, a tension spring 15, a push piece 16, an L-shaped pin 17, a sliding groove 18, a fastening screw 19, a fastening nut 20 and a lower handle 21.

[0037] The bracket 1 is a special-shaped structure, the upper end of which is provided with an ear 1-1, and the ear is provided with an ear through hole for hinging with the upper handle 5; the other end of the bracket 1 is provided with two fork-shaped structures 1-3, and the fork-shaped structures are provided with through holes for hinging with the lower hook claw 11 and the upper hook claw 12; the upper end of the bracket 1 is provided with a depression 1-4, and the depression is provided with a stepped hole through hole 1-5 for installing the pressing rod 2, and the lower end surface close to the arc-shaped pressing block 10 is in precise gap cooperation with the pressing rod 2, so as to ensure that the movement direction of the pressing rod 2 is unchanged; the upper end of the stepped hole through hole 1-5 of the bracket 1 is provided with a thread for screwing with the end cover 4 to limit the pressing rod 2; at the same time, the lower end of the bracket 1 is provided with two tension spring hanging holes 1-6 for hanging the tension spring 15.

[0038] The pressing rod 2 is a stepped shaft, one end of which penetrates into the stepped hole through hole 1-5 of the bracket 1, and the compression spring 3 is sleeved on the pressing rod 2; when the pressing rod 2 is pressed down and the upper handle 5 is released, the compression spring 3 can make the pressing rod 2 return to the initial position.

[0039] The end cover 4 is a stepped shell part, which is screwed with the stepped hole through hole 1-5 on the bracket 1 to limit the pressing rod 2 and the compression spring 3 in the hole to prevent them from escaping; the center of the end cover 4 is provided with a through hole, so that the pressing rod 2 penetrates through, and at the same time, the stepped platform of the pressing rod 2 cannot pass through, so as to limit the continuous upward movement of the pressing rod 2; the upper end of the end cover 4 is provided with a flat structure for clamping during screwing.

[0040] The upper handle 5 is a rod-shaped component, and its end is provided with a through hole which is concentrically matched with the ear hole on the ear of the bracket 1. The rotating shaft 8 passes through the through holes of the above two parts to form a rotating pair, so that the upper handle 5 and the bracket 1 can rotate relative to each other. The lower end of the handle 5 is provided with a support, and the support is provided with a roller mounting hole. The upper handle 5 is provided with a screw hole near the middle, which is used for fixedly installing the push piece 16. The bolt shaft 6 passes through the through hole of the support and the center hole of the roller 7 to form a rotating pair, so that the roller 7 rotates during the pressing process to reduce the sliding resistance. The push piece 16 is an arc-shaped toothed component, which is fixedly installed on the threaded hole of the upper handle 5 by a fastening screw.

[0041] The limit pin 9 is a cylindrical component which penetrates into the hole of the rotating shaft 8 to prevent the rotating shaft 8 from escaping during use.

[0042] The arc-shaped pressing block 10 is an arc-shaped component which is fixedly connected to the bottom of the pressing rod 2. The installation direction of the arc surface satisfies that the axis of the arc surface is parallel to the axis of the rotating shaft 8, so that the arc surface is matched with the outer side of the torsional spring mounting hole during use to ensure firm clamping.

[0043] The lower hook claw 11 and the upper hook claw 12 are the same in structure and different in size. One end is provided with a mounting hole which is hinged with the hole at the end of the fork-shaped structure 1-3 on the bracket 1 through the upper hook claw shaft 13 and the lower hook claw shaft 14 to realize relative rotation. The lower end of the upper and lower hook claws is provided with a hook structure, which is used for hooking the upper and lower ends a and b of the torsional spring. The middle part of the upper and lower hook claws is provided with a tension spring mounting hole. The two ends of the tension spring 15 are respectively installed in the tension spring mounting holes of the bracket 1 and the upper and lower hook claws. When the upper and lower hook claws are clamped at the a and b ends of the torsional spring, a small restoring force is applied to prevent falling.

[0044] The push piece 16 is an arc-shaped component, and the outer arc surface is provided with teeth. One end is fixed on the bracket 1 by a fastening screw, and the other end is in a free state. When the upper handle 5 is pressed, the push piece 16 rotates along the rotating shaft 8. When it rotates to an angle not less than the installation angle of the torsional spring, the L-shaped locking pin 17 is pushed to slide in the sliding groove 18. The sharp end of the L-shaped locking pin 17 penetrates into the teeth of the push piece 16 to limit the rebound of the upper handle 5 and keep the opening angle of the torsional spring.

[0045] The sliding groove 18 is a concave component which is fixedly installed on the side surface of the upper handle 5.

[0046] The lower handle 21 is a rod-shaped arc-shaped component which generates a counterforce to the hand when the upper handle 5 is pressed downward. Embodiment

[0047] A powerful torsion spring installation tool for use in confined spaces includes a bracket 1, a pressure rod 2, a compression spring 3, an end cap 4, an upper handle 5, a bolt shaft 6, a roller 7, a rotating shaft 8, a limit pin 9, an arc-shaped pressure block 10, a lower hook claw 11, an upper hook claw 12, an upper hook claw shaft 13, a lower hook claw shaft 14, a tension spring 15, a paddle 16, an L-shaped locking pin 17, a sliding groove 18, a fastening screw 19, a fastening nut 20, and a lower handle 21.

[0048] The details are as follows: Figure 1 The diagram shows the structure of the torsion spring to be installed. The torsion spring is made of 30CrMnSiA hot-rolled and annealed material. The characteristics of this torsion spring are high stiffness and large torque. Its upper end is a, its lower end is b, and a mounting hole c is formed in the middle.

[0049] The usage steps are as follows:

[0050] 1. Arrange the torsion spring as follows Figure 4 Install in the following manner. At this time, manually overcome the tension of the tension spring 15, which requires low stiffness. Open the relative angle of the lower hook 11 and the upper hook 12, and lock the a end of the torsion spring onto the upper hook 12 and the b end onto the lower hook 11. Press the upper handle 5 to make it rotate around the rotating shaft 8 towards the lower handle 21. The roller 7 acts on the upper end face of the pressure rod 2, and the pressure rod 2 moves downward to bring the arc-shaped pressure block 10 close to the outer arc surface of the mounting hole c of the torsion spring. Continue to press the upper handle 5 to make the pressure rod 2 continue to apply pressure to the torsion spring, so that the angle of the torsion spring opens. The a and b ends of the torsion spring open, causing the upper hook 12 and the lower hook 11 to rotate around the hook shaft 13 and the lower hook shaft 14.

[0051] 2. After the torsion spring is opened to an angle not less than the installation angle of the torsion spring, the torsion spring is placed in the assembly position through this device. At this time, the central shaft of the torsion spring can be easily passed through the locking and mounting hole to realize the installation of the torsion spring.

[0052] 3. After the torsion spring is installed, manually move the lower hook 11 and the upper hook 12 to open their relative angles, so that they are separated from the two ends of the torsion spring, thus completing the disassembly of the device. The torsion spring is firmly fixed in the position to be installed by the restoring force.

Claims

1. A tool for installing a strong torsion spring in a confined space, comprising: The device comprises a bracket (1), a pressing rod (2), a compression spring (3), an end cover (4), an upper handle (5), a bolt shaft (6), a roller (7), a rotating shaft (8), a limiting pin (9), an arc-shaped pressing block (10), a lower hook claw (11), an upper hook claw (12), an upper hook claw shaft (13), a lower hook claw shaft (14), a tension spring (15), a shifting piece (16), an L-shaped clamping pin (17), a sliding groove (18), a fastening screw (19), a fastening nut (20) and a lower handle (21). The bracket (1) is of a special-shaped structure, the upper end of the bracket (1) is provided with an ear piece (1-1), the ear piece (1-1) is provided with an ear piece through hole, the bracket (1) is hinged with the upper handle (5), the other end of the bracket (1) is provided with two fork-shaped structures (1-3), the fork-shaped structures (1-3) are provided with through holes, the bracket (1) is hinged with the lower hook claw (11) and the upper hook claw (12), the upper end of the bracket (1) is provided with a depression (1-4), the depression (1-4) is provided with a stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1-5), the bracket (1) is provided with the stepped hole through hole (1- ​ ​ ​ ​ 2. A tool for installing a strong torsion spring in a confined space as defined in claim 1, wherein The limiting pin (9) is a cylindrical member, which is inserted into the hole of the rotating shaft (8) to prevent the rotating shaft (8) from moving out during use.

3. A tool for installing a strong torsion spring in a confined space according to claim 1 or 2, wherein The arc-shaped pressing block (10) is an arc-shaped member, which is fixedly connected to the bottom of the pressing rod (2), and the installation direction of the arc surface satisfies that the axis of the arc surface is parallel to the axis of the rotating shaft (8), so that the arc surface is matched with the outer side of the installation hole of the torsion spring during use, and the clamping is ensured to be firm.

4. A tool for installing a strong torsion spring in a confined space as claimed in claim 1 or 2, wherein The lower hook claw (11) and the upper hook claw (12) are the same in structure and different in size, one end of each of which is provided with a mounting hole and is hingedly connected to the hole at the end of the fork-shaped structure (1-3) on the support (1) through the upper hook claw shaft (13) and the lower hook claw shaft (14) to realize relative rotation; the middle part of each of the upper and lower hook claws is provided with a tension spring mounting hole, and the two ends of the tension spring (15) are respectively mounted in the tension spring mounting holes of the support (1) and the upper and lower hook claws, so that when the upper and lower hook claws are clamped at the a end and the b end of the torsion spring, a small restoring force is applied to prevent the torsion spring from falling off.

5. A tool for installing a strong torsion spring in a confined space as defined in claim 3, wherein The lower hook claw (11) and the upper hook claw (12) are the same in structure and different in size, one end of each of which is provided with a mounting hole and is hingedly connected to the hole at the end of the fork-shaped structure (1-3) on the support (1) through the upper hook claw shaft (13) and the lower hook claw shaft (14) to realize relative rotation; the middle part of each of the upper and lower hook claws is provided with a tension spring mounting hole, and the two ends of the tension spring (15) are respectively mounted in the tension spring mounting holes of the support (1) and the upper and lower hook claws, so that when the upper and lower hook claws are clamped at the a end and the b end of the torsion spring, a small restoring force is applied to prevent the torsion spring from falling off.

6. A tool for installing a strong torsion spring in a confined space as claimed in claim 1 or 2 or 5 wherein, The pressing plate (16) is an arc-shaped member, the outer arc surface of which is provided with teeth, one end of which is fixed on the support (1) through a fastening screw, and the other end is in a free state; when the upper handle (5) is pressed, the pressing plate (16) rotates along the rotating shaft (8); when the rotating angle is not less than the installation angle of the torsion spring, the L-shaped clamping pin (17) is pushed to slide in the sliding groove (18), the sharp end of the L-shaped clamping pin (17) is inserted into the teeth of the pressing plate (16), the rebound of the upper handle (5) is limited, and the opening angle of the torsion spring is maintained.

7. A tool for installing a strong torsion spring in a confined space as defined in claim 3 wherein, The pressing plate (16) is an arc-shaped member, the outer arc surface of which is provided with teeth, one end of which is fixed on the support (1) through a fastening screw, and the other end is in a free state; when the upper handle (5) is pressed, the pressing plate (16) rotates along the rotating shaft (8); when the rotating angle is not less than the installation angle of the torsion spring, the L-shaped clamping pin (17) is pushed to slide in the sliding groove (18), the sharp end of the L-shaped clamping pin (17) is inserted into the teeth of the pressing plate (16), the rebound of the upper handle (5) is limited, and the opening angle of the torsion spring is maintained.

8. A tool for installing a strong torsion spring in a confined space as defined in claim 4 wherein, The pressing plate (16) is an arc-shaped member, the outer arc surface of which is provided with teeth, one end of which is fixed on the support (1) through a fastening screw, and the other end is in a free state; when the upper handle (5) is pressed, the pressing plate (16) rotates along the rotating shaft (8); when the rotating angle is not less than the installation angle of the torsion spring, the L-shaped clamping pin (17) is pushed to slide in the sliding groove (18), the sharp end of the L-shaped clamping pin (17) is inserted into the teeth of the pressing plate (16), the rebound of the upper handle (5) is limited, and the opening angle of the torsion spring is maintained.

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