Flat spiral spring retraction device and method

Abstract

The application relates to a flat spiral spring tightening device and method, and solves the technical problems that the existing spiral spring needs to be repeatedly taken out during assembly, the assembly period is lengthened, the spiral spring is easily scratched during loading into a spring box, and the spiral spring surface treatment is difficult to perform. The flat spiral spring tightening device comprises a spring box seat, a spiral spring shaft arranged in the spring box, a spiral spring wrench, a tightening assembly, a fixing assembly, a spiral spring shaft connecting assembly, the upper end of the spiral spring shaft extends out of the upper end of the spring box, the lower end of the spiral spring shaft is connected with the spiral spring shaft connecting assembly through the inner bottom of the spring box, the spiral spring wrench is rotatably connected with the fixing assembly, the tightening assembly is matched with an outer interface of the spiral spring, and is used for rotating the outer interface of the spiral spring to realize spiral spring tightening. The method can be used for spiral spring initial assembly, surface treatment, fine assembly, testing, secondary adjustment and other working processes.

Description

Technical Field

[0001] The present invention specifically relates to a planar scroll spring tightening device and method. Background Art

[0002] Planar spiral springs (referred to as coil springs) have the advantages of small axial dimensions and large torque storage, and are increasingly used in aerospace systems. Generally, after the coil spring parameters are designed, when the coil spring torque is large, it is impossible to directly wind the coil spring by manpower. Therefore, the inner diameter of the spring box must be determined based on the outer diameter of the coil spring in its free state. The inner diameter of the spring box must be larger than the outer diameter of the coil spring in its free state, so that the coil spring can be loaded into the spring box with minimal effort and then wound to the working position. In special cases, when the size of the spring box cannot be increased due to space limitations, the finished coil spring must be rolled into a small outer diameter on a spring winding machine before being installed into the spring box. It is then bound with wire. During installation, the entire spring is loaded into the spring box, and the wire is cut to complete the assembly.

[0003] However, when used in the aerospace field, the size of the spring box cannot be increased due to extreme space limitations. If the spring box is wound on a spring coiling machine and then bound with wire, there are the following disadvantages: 1. Due to the large amount of force stored in the spring, the wire can easily scratch the spring, resulting in excess material. 2. Coiled springs generally require special surface treatment, such as anti-cold welding. If they are wound on a spring coiling machine, there is a risk of contamination of the surface of the parts and uncontrollable risks. 3. During assembly, the spring needs to be loaded into the spring box multiple times, not a one-time operation, and there is a step of removal during the process. If a spring coiling machine is used to wind the spring, the assembly cycle will be extended.

[0004] In summary, the existing coil springs prolong the production cycle when they are taken out; when they are put into the spring box, the coil springs are easily scratched, resulting in excess material and making it difficult to perform surface treatment on the coil springs. Summary of the Invention

[0005] The purpose of the present invention is to solve the technical problems that the existing coil spring needs to be repeatedly taken out during assembly, which prolongs the assembly cycle; when it is installed in the spring box, the coil spring is easily scratched, resulting in excess material and difficulty in surface treatment of the coil spring, and provide a flat spiral spring tightening device and method.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A planar scroll spring tightening device is used to install a scroll spring into a spring box. The device is special in that it includes a spring box seat, a scroll spring shaft disposed in the spring box, a scroll spring wrench, a tightening assembly, a fixing assembly, and a scroll spring shaft connecting assembly.

[0008] The upper end of the spring box seat is connected to the fixed assembly, and the lower end of the spring box seat is used to connect to the external fixed platform;

[0009] The spring box is arranged in the spring box seat, the lower end of the spring box is connected to the inner bottom of the spring box seat, the upper end of the spring box is used to install the coil spring, and the side wall of the spring box is provided with a spring box notch adapted to the outer interface of the coil spring;

[0010] The upper end of the coil spring shaft extends out of the upper end of the spring box, and the upper end of the coil spring shaft is provided with a coil spring shaft notch along the axial direction, which is adapted to the inner interface of the coil spring; the lower end of the coil spring shaft passes through the inner bottom of the spring box and is connected to the coil spring shaft connecting assembly, and the coil spring shaft connecting assembly is fixed to the spring box seat;

[0011] The coil spring wrench is arranged above the spring box seat through a fixing assembly, and the coil spring wrench and the fixing assembly are rotatably connected;

[0012] One end of the tightening assembly is slidably connected to the coil spring wrench, and the other end is adapted to the outer interface of the coil spring, and is used to drive the outer interface of the coil spring to rotate to achieve tightening of the coil spring.

[0013] Furthermore, the coil spring wrench is an umbrella-shaped structure, which includes a handle and three flat plates; the three flat plates are connected in sequence to form a closed triangular wrench; wherein, a wrench straight slot hole adapted to the sliding end of the tightening assembly is provided on one flat plate, a wrench center hole is provided in the middle of the other flat plate, and a wrench rotating shaft for connecting to the fixed assembly is provided in the wrench center hole; the central axis of the wrench straight slot hole and the central axis of the flat plate where the wrench center hole is located form an angle θ, 20°≤θ≤70°; one end of the handle is connected to the side of any one of the three flat plates, used to push the closed triangular wrench to rotate along the wrench rotating shaft.

[0014] Furthermore, the tightening assembly includes a sliding pin stop, a sliding pin column, a sliding pin upper cover plate and a sliding pin lower cover plate; the sliding pin stop is adapted to the straight slot hole of the wrench, and its upper end is connected to the sliding pin upper cover plate, and its lower end is connected to the sliding pin lower cover plate; the sliding pin upper cover plate and the sliding pin lower cover plate are respectively located on the upper and lower sides of the straight slot hole of the wrench, for limiting the inclination of the sliding pin stop; the upper end of the sliding pin column is connected to the lower end surface of the sliding pin lower cover plate, and the sliding pin column is used to cooperate with the external interface of the coil spring; the sliding pin stop slides along the coil spring wrench and thereby drives the sliding pin column to tighten the coil spring.

[0015] Furthermore, the coil spring shaft connection assembly includes a connecting member and a protrusion;

[0016] The connecting piece is a cylindrical structure, in which a limiting blind hole is provided that is compatible with the lower end of the coil spring shaft; the lower end of the coil spring shaft passes through the inner bottom of the spring box and is connected to the connecting piece through the limiting blind hole; the spring box seat also includes a limiting assembly; the limiting assembly includes two limiting columns arranged on the inner bottom of the spring box seat; one end of the protrusion is connected to the outer side wall of the connecting piece, and the other end is arranged between the two limiting columns.

[0017] Furthermore, the fixing assembly includes at least two pads and a transverse plate; the lower ends of the pads are respectively connected to the spring box seats, and the upper ends are respectively connected to the transverse plates; the upper end of the wrench shaft is fixedly connected to the transverse plate, and the lower end passes through the center hole of the wrench and is connected to the nut.

[0018] Furthermore, it also includes a sliding push rod; a wrench side hole is provided at the other end of the handle, and wrench side holes are respectively provided at both ends of the plate connected to the handle, and the wrench side holes are used to install a push rod; a threaded hole is provided on the end of the plate corresponding to the wrench straight slot hole away from the plate connected to the handle along the axis direction of the wrench straight slot hole; the sliding push rod is used to pass through the threaded hole and abut against the sliding pin stop;

[0019] A limiting step is provided at the lower end of the wrench shaft, and the lower end passes through the center hole of the wrench and is connected to the nut; the limiting step is used to limit the axial movement of the closed triangle wrench.

[0020] Furthermore, the spring box seat includes a base plate, a connecting ring and multiple support columns; the lower end of the support column is connected to the base plate, and the upper end is connected to the connecting ring; the lower end of the pad column is connected to the connecting ring; the lower end of the spring box is connected to the base plate.

[0021] Furthermore, the coil spring shaft notch is an arc-shaped notch;

[0022] The spring box seat, the spring box and the coil spring shaft are coaxially arranged.

[0023] At the same time, the present invention also provides a planar scroll spring tightening method, based on the above-mentioned planar scroll spring tightening device, which is special in that it includes the following steps:

[0024] 1] Assemble the spring box seat, spring box, coil spring shaft connection assembly, and coil spring shaft;

[0025] 2] Install the coil spring on the upper end of the spring box, and connect the inner interface of the coil spring to the upper end of the coil spring shaft through the notch of the coil spring shaft, and at the same time, connect the outer interface of the coil spring to the other end of the tightening assembly;

[0026] 3] Install the fixing assembly, coil spring wrench and tightening assembly;

[0027] 4] Rotate the coil spring wrench and drive the tightening assembly to slide along the coil spring wrench to tighten the coil spring.

[0028] Furthermore, it also includes step 5] and step 6]:

[0029] 5] After the coil spring is tightened, install the coil spring into the spring box and snap the outer interface of the coil spring into the notch of the spring box;

[0030] 6】Remove the flat scroll spring tightening device.

[0031] Beneficial effects of the present invention:

[0032] 1. The present invention provides a planar scroll spring tightening device, which can ensure that the surface of the coil spring is treated to prevent cold welding when it is in a free state (the surface treatment cannot be performed in the coiled state). After the surface treatment, the coil spring can be stored in a small-sized spring box. After removing the device, subsequent assembly operations can be carried out directly.

[0033] 2. The flat scroll spring tightening device of the present invention reduces the requirement that the inner diameter of the spring box must be larger than the outer diameter of the flat scroll spring in the free state, thereby saving the space occupied by the spring box. It also avoids the complicated process in traditional devices where the spring needs to be wound into a small size on a winding machine and then temporarily bound with wire to facilitate insertion into the small-sized spring box.

[0034] 3. The flat spiral spring tightening device of the present invention enables the volume of the spring box to be reduced and the coil spring to be enlarged, thereby increasing the coil spring storage torque.

[0035] 4. The present invention provides a planar scroll spring tightening device. After the coil spring is produced, it does not need to be reloaded into the winding machine for tightening, which simplifies the process flow.

[0036] 5. The planar scroll spring tightening method of the present invention allows the operator to easily store the scroll spring into the spring box; during the production and development process, the scroll spring can be disassembled and assembled multiple times.

[0037] 6. The planar scroll spring tightening method of the present invention can be used in the initial installation, surface treatment, fine installation, testing, secondary adjustment and other working processes of the scroll spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic structural diagram of an embodiment of a planar scroll spring tightening device according to the present invention;

[0039] Figure 2 A schematic diagram of the installation of a coil spring shaft connecting assembly and a limiting assembly in an embodiment of a planar scroll spring tightening device of the present invention;

[0040] Figure 3 A schematic structural diagram of a tightening assembly in an embodiment of a planar scroll spring tightening device of the present invention;

[0041] Figure 4 A schematic structural diagram of a coil spring wrench in an embodiment of a planar scroll spring tightening device of the present invention;

[0042] Figure 5 A schematic diagram of a planar scroll spring tightening device according to the present invention before the spring is inserted into the box;

[0043] Figure 6 A schematic diagram of a planar scroll spring tightening device according to an embodiment of the present invention when tightening a scroll spring;

[0044] Figure 7 for Figure 6 sectional view of

[0045] Figure 8 Schematic diagram of a planar scroll spring tightening device embodiment of the present invention after the coiled spring is placed in the box.

[0046] Description of reference numerals:

[0047] 1. Spring box seat; 101. Base plate; 102. Connecting ring; 103. Support column; 2. Pad column; 3. Horizontal plate; 4. Wrench shaft; 5. Coil spring wrench; 501. Wrench straight slot hole; 502. Wrench center hole; 503. Threaded hole; 504. Wrench side hole; 505. Flat plate; 506. Handle; 6. Tightening assembly; 601. Sliding pin stop; 602. Sliding pin column; 603. Sliding pin upper cover plate; 604. Sliding pin lower cover plate; 7. Fixing assembly; 8. Sliding push rod; 9. Coil spring shaft connecting assembly; 901. Protrusion; 902. Connecting piece; 10. Limiting assembly; 11. Spring box; 1101. Spring box slot; 12. Coil spring; 1201. Coil spring outer interface; 1202. Coil spring inner interface; 13. Coil spring shaft; 1301. Coil spring shaft slot. DETAILED DESCRIPTION

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0049] like Figure 1 、 Figure 2 As shown, a planar scroll spring tightening device is used to install a scroll spring 12 into a spring box 11; it includes a spring box seat 1, a sliding push rod 8, a limiting assembly 10 arranged in the spring box seat 1, a scroll spring shaft 13 arranged in the spring box 11, a scroll spring wrench 5, a tightening assembly 6, a fixing assembly 7, and a scroll spring shaft connecting assembly 9; in this embodiment, the spring box seat 1 is composed of a base plate 101, a connecting ring 102 and a plurality of support columns 103; the scroll spring shaft connecting assembly 9 is composed of a connecting piece 902 and a protrusion 901; for easy installation, the spring box seat 1, the spring box 11 and the scroll spring shaft 13 are coaxially arranged.

[0050] The lower end of the support column 103 is connected to the base plate 101, and the upper end is connected to the connecting ring 102. The lower end of the spacer column 2 is connected to the connecting ring 102; the lower end of the spring box 11 is connected to the base plate 101. The base plate 101 is used to connect to an external fixed platform to stabilize the entire device. The spring box 11 is placed within the spring box seat 1. The lower end of the spring box 11 is connected to the base plate 101, and the upper end of the spring box 11 is used to mount the coil spring 12. The side wall of the spring box 11 is provided with a spring box notch 1101 that matches the coil spring external interface 1201. The upper end of the coil spring shaft 13 extends out of the upper end of the spring box 11, and an arc-shaped coil spring shaft groove 1301 is axially provided on the upper end of the coil spring shaft 13 to match the inner interface 1202 of the coil spring; the lower end of the coil spring shaft 13 passes through the inner bottom of the spring box 11 and is connected to the connecting piece 902, and the protrusion 901 is fixed between the spring box 11 and the spring box seat 1 through the limit assembly 10.

[0051] like Figure 3 As shown, the tightening assembly 6 is composed of a sliding pin stop 601, a sliding pin column 602, a sliding pin upper cover plate 603 and a sliding pin lower cover plate 604; for the convenience of production, the sliding pin stop 601, the sliding pin column 602 and the sliding pin upper cover plate 603 can be made as one piece; the upper end of the sliding pin stop 601 is screwed to the sliding pin upper cover plate 603, and the lower end is screwed to the sliding pin lower cover plate 604; the sliding pin stop 601 forms a stop fit with the coil spring wrench 5 to ensure that the sliding pin stop 601 only moves along the coil spring wrench 5 and cannot tilt. The upper end of the sliding pin 602 is connected to the lower surface of the sliding pin lower cover plate 604, and the sliding pin 602 is located below the sliding pin lower cover plate 604. The sliding pin upper cover plate 603 and the sliding pin lower cover plate 604 are respectively located on the upper and lower sides of the spanner straight slot 501. They are used to limit the tilt of the sliding pin stop 601, allowing it to translate along the spanner straight slot 501 and keep the sliding pin 602 in a downward position, preventing it from disengaging from the coil spring 12 or causing it to become stuck during rotation. The sliding pin 602 is designed to mate with the coil spring external interface 1201; the sliding pin stop 601 slides along the coil spring spanner 5, thereby driving the sliding pin 602 to tighten the coil spring 12.

[0052] like Figure 4 As shown, the coil spring wrench 5 is an umbrella-shaped structure, which consists of a handle 506 and three flat plates 505; the three flat plates 505 are connected in sequence to form a closed triangular wrench; a wrench straight slot hole 501 is provided on one flat plate 505, and the sliding pin stop 601 and the wrench straight slot hole 501 form a sliding pair that can slide along the wrench straight slot hole 501; a wrench center hole 502 is provided in the middle of the other flat plate 505, and a wrench rotating shaft 4 for connecting to the fixing component 7 is provided in the wrench center hole 502; the center axis of the wrench straight slot hole 501 and the center axis of the flat plate 505 where the wrench center hole 502 is located form an angle θ of 35°, so that when the coil spring 12 stores torque, the sliding pin stop 601 can move along the wrench straight slot hole 501.

[0053] One end of the handle 506 is connected to the side of any of the three flat plates 505, propelling the closed triangular wrench to rotate along the wrench shaft 4, forming a sliding friction pair. This simultaneously allows the sliding pin 602 to translate along the wrench slot 501. As the coil spring 12 is tightened, the upper sliding pin cover 603, the sliding pin stop 601, and the lower sliding pin cover 604 slide along the wrench slot 501, adapting to the changing outer diameter of the coil spring 12.

[0054] Connecting member 902 is a cylindrical structure with a blind stopper hole that fits within the lower end of coil spring shaft 13. The lower end of coil spring shaft 13 passes through the inner bottom of spring box 11 and is connected to connecting member 902 via the blind stopper hole. The stopper assembly 10 includes two stopper posts disposed on the inner bottom of spring box seat 1. A protrusion 901 has one end connected to the outer wall of connecting member 902 and the other end disposed between the two stopper posts, limiting the rotation of coil spring shaft 13. In this embodiment, the two stopper posts are made of a flexible copper alloy H62.

[0055] In this embodiment, the fixing assembly 7 consists of two spacers 2, a horizontal plate 3, and a wrench shaft 4. The lower ends of the two spacers 2 are connected to the upper end of the spring box seat 1 via long screws, and the upper ends of the two spacers 2 are connected to the ends of the horizontal plate 3 via screws. The wrench shaft 4 is a T-shaped structure, with its upper end connected to the horizontal plate 3 and a limit step at its lower end. The lower end passes through the wrench center hole 502 and is connected to a nut to prevent the coil spring wrench 5 from falling. The coil spring wrench 5 and the wrench shaft 4 are mated via a cylindrical stop. The limit step is used to limit the axial movement of the closed triangular wrench.

[0056] Preferably, a wrench side hole 504 is provided at the other end of the handle 506, and wrench side holes 504 are provided at both ends of the flat plate 505 connected to the handle 506. The wrench side holes 504 are used to install a push rod to extend the operator's force arm, forming a lever, facilitating rotation, and also making the operator more labor-saving. A threaded hole 503 is provided on the flat plate 505 corresponding to the wrench straight slot hole 501, at the end of the flat plate 505 away from the handle 506, along the axis of the wrench straight slot hole 501. The sliding push rod 8 is used to pass through the threaded hole 503 and abut against the sliding pin stop 601. Rotating the sliding push rod 8 can assist the sliding pin stop 601 in translation, preventing the sliding pin stop 601 from being unable to translate smoothly in the event of an accident.

[0057] like Figure 5 、 Figure 6 、 Figure 7 As shown, the present invention is based on the planar scroll spring tightening method of the above-mentioned planar scroll spring tightening device, and the specific steps are as follows:

[0058] 1] Assemble the spring box seat 1, spring box 11, coil spring shaft connecting assembly 9 and coil spring shaft 13;

[0059] 1.1. Connect the two limit posts to the bottom plate 101 of the spring box seat 1 with screws;

[0060] 1.2. Pass the lower end of the coil spring shaft 13 through the spring box 11 and connect it to the connector 902. Then connect the spring box 11 to the bottom plate 101 of the spring box seat 1, and make sure the protrusion 901 is located between the two limit posts.

[0061] 2] Install the coil spring 12 on the upper end of the spring box 11, and engage the coil spring inner interface 1202 with the upper end of the coil spring shaft 13 through the arc-shaped coil spring shaft notch 1301. Before insertion, the coil spring outer interface 1201 does not overlap with the spring box notch 1101 in either the radial or circumferential directions, thus being in a free state. In other embodiments, if the coil spring 12 is designed to tighten by rotating clockwise, the coil spring 12 can be connected to the coil spring 12 by simply turning it upside down when installing.

[0062] 3] Install the fixing assembly 7, the coil spring wrench 5 and the tightening assembly 6;

[0063] 3.1. Connect the wrench shaft 4 to the horizontal plate 3, then insert the coil spring wrench 5 through the wrench center hole 502 to fit the wrench shaft 4 cylindrically and secure it with a nut to form a rotating pair;

[0064] 3.2. Fix the entire horizontal plate 3 to the upper end of the spring box seat 1 through the pad column 2;

[0065] 3.3. Insert the sliding pin stop 601 through the spanner straight slot hole 501. Use screws to connect the sliding pin upper cover plate 603, the sliding pin lower cover plate 604, and the sliding pin column 602 to the sliding pin stop 601 to form a moving pair. Then screw the sliding push rod 8 into the threaded hole 503.

[0066] 3.4. Adjust the position of the tightening assembly 6 so that the sliding pin 602 contacts the outer interface 1201 of the coil spring;

[0067] 4] Insert the push rod into the side hole 504 of the wrench, rotate the coil spring wrench 5, and slide the tightening assembly 6 along the coil spring wrench 5 to tighten the coil spring 12;

[0068] As the coil spring 12 rotates, due to the force of the coil spring 12, the sliding pin 602 can drive the coil spring outer interface 1201 to move radially inward until it is directly above the spring box notch 1101, and then stops rotating. During the rotation process, if the sliding pin 602 is not able to slide smoothly due to large resistance, the sliding push rod 8 can be used to assist in adjusting the real-time position of the sliding pin 602.

[0069] 5] After the coil spring 12 is tightened, it is loaded into the spring box 11 by external force, and the outer interface 1201 of the coil spring is engaged with the spring box notch 1101, completing the insertion of the coil spring 12 into the box. At this point, the outer interface 1201 of the coil spring is engaged with the spring box notch 1101, and the inner interface 1202 of the coil spring is completely seated at the bottom of the coil spring shaft notch 1301; at this point, the spring box 11, coil spring 12, and coil spring shaft 13 form a single unit.

[0070] 6】Remove the flat scroll spring tightening device.

[0071] Remove the flat scroll spring take-up device in sequence and use it for the next assembly.

[0072] In this embodiment, the coil spring 12 rotates counterclockwise as the winding direction, and the coil spring wrench 5 also rotates counterclockwise around the wrench shaft 4 to complete the winding. Figure 8 As shown, if the designed parameters of the coil spring 12 are for clockwise winding, the clockwise winding of the coil spring 12 can be completed by installing the coil spring 12 in reverse.

[0073] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention shall be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A planar scroll spring tightening device for installing a scroll spring (12) into a spring box (11); characterized in that: It comprises a spring box seat (1), a coil spring shaft (13) arranged in the spring box (11), a coil spring wrench (5), a tightening assembly (6), a fixing assembly (7), and a coil spring shaft connecting assembly (9); The upper end of the spring box seat (1) is connected to the fixing assembly (7), and the lower end of the spring box seat (1) is used to be connected to an external fixing platform; The spring box (11) is arranged in the spring box seat (1), the lower end of the spring box (11) is connected to the inner bottom of the spring box seat (1), the upper end of the spring box (11) is used to install the coil spring (12), and the side wall of the spring box (11) is provided with a spring box notch (1101) adapted to the outer interface (1201) of the coil spring; The upper end of the coil spring shaft (13) extends out of the upper end of the spring box (11), and the upper end of the coil spring shaft (13) is provided with a coil spring shaft notch (1301) along the axial direction, which is adapted to the coil spring inner interface (1202); the lower end of the coil spring shaft (13) passes through the inner bottom of the spring box (11) and is connected to the coil spring shaft connecting assembly (9), and the coil spring shaft connecting assembly (9) is fixed on the spring box seat (1); The coil spring wrench (5) is arranged above the spring box seat (1) through a fixing assembly (7), and the coil spring wrench (5) and the fixing assembly (7) are rotatably connected; One end of the tightening assembly (6) is slidably connected to the coil spring wrench (5), and the other end is adapted to the coil spring external interface (1201), and is used to drive the coil spring external interface (1201) to rotate, thereby tightening the coil spring (12).

2. The planar scroll spring tightening device according to claim 1, characterized in that: The coil spring wrench (5) is an umbrella-shaped structure, comprising a handle (506) and three flat plates (505); The three flat plates (505) are connected in sequence to form a closed triangular wrench; wherein, a wrench straight slot hole (501) adapted to the sliding end of the tightening assembly (6) is provided on one flat plate (505), a wrench center hole (502) is provided in the middle of the other flat plate (505), and a wrench rotating shaft (4) for connecting to the fixing assembly (7) is provided in the wrench center hole (502); the central axis of the wrench straight slot hole (501) and the central axis of the flat plate (505) where the wrench center hole (502) is located form an angle θ, 20°≤θ≤70°; One end of the handle (506) is connected to the side of any one of the three flat plates (505) and is used to push the closed triangular wrench to rotate along the wrench shaft (4).

3. The planar scroll spring tightening device according to claim 2, characterized in that: The tightening assembly (6) comprises a sliding pin stop (601), a sliding pin column (602), a sliding pin upper cover plate (603) and a sliding pin lower cover plate (604); The sliding pin stop (601) is adapted to the spanner straight slot hole (501), and its upper end is connected to the sliding pin upper cover plate (603), and its lower end is connected to the sliding pin lower cover plate (604); the sliding pin upper cover plate (603) and the sliding pin lower cover plate (604) are respectively located on the upper and lower sides of the spanner straight slot hole (501), and are used to limit the sliding pin stop (601) from tilting; The upper end of the sliding pin column (602) is connected to the lower end surface of the sliding pin lower cover plate (604), and the sliding pin column (602) is used to cooperate with the outer interface (1201) of the coil spring; The sliding pin stop (601) slides along the coil spring wrench (5) and drives the sliding pin column (602) to tighten the coil spring (12).

4. The planar scroll spring tightening device according to claim 3, characterized in that: The coil spring shaft connection assembly (9) includes a connection piece (902) and a protrusion (901); The connecting member (902) is a cylindrical structure, and is provided with a limiting blind hole adapted to the lower end of the coil spring shaft (13); the lower end of the coil spring shaft (13) passes through the inner bottom of the spring box (11) and is connected to the connecting member (902) through the limiting blind hole; The spring box seat (1) further comprises a limiting assembly (10); the limiting assembly (10) comprises two limiting columns arranged on the inner bottom of the spring box seat (1); One end of the protrusion (901) is connected to the outer side wall of the connecting member (902), and the other end is arranged between the two limiting columns.

5. The planar scroll spring tightening device according to claim 4, characterized in that: The fixing assembly (7) comprises at least two pad columns (2) and a transverse plate (3); The lower ends of the cushion columns (2) are respectively connected to the spring box seats (1), and the upper ends are respectively connected to the transverse plates (3); The upper end of the wrench rotating shaft (4) is fixedly connected to the horizontal plate (3), and the lower end passes through the wrench center hole (502) and is connected to the nut.

6. The planar scroll spring tightening device according to claim 5, characterized in that: Also includes a sliding push rod (8); The other end of the handle (506) is provided with a wrench side hole (504), and both ends of the flat plate (505) connected to the handle (506) are respectively provided with a wrench side hole (504), and the wrench side hole (504) is used to install the push rod; A threaded hole (503) is provided on the flat plate (505) corresponding to the spanner straight slot hole (501) and away from one end of the flat plate (505) connected to the handle (506) along the axial direction of the spanner straight slot hole (501); the sliding push rod (8) is used to pass through the threaded hole (503) and abut against the sliding pin stop (601); A limiting step is provided at the lower end of the wrench shaft (4), and the lower end passes through the wrench center hole (502) and is connected to the nut; the limiting step is used to limit the axial movement of the closed triangular wrench.

7. The planar scroll spring tightening device according to claim 6, characterized in that: The spring box seat (1) comprises a bottom plate (101), a connecting ring (102) and a plurality of supporting columns (103); The lower end of the support column (103) is connected to the bottom plate (101), and the upper end is connected to the connecting ring (102); The lower end of the cushion column (2) is connected to the connecting ring (102); The lower end of the spring box (11) is connected to the bottom plate (101).

8. The planar scroll spring tightening device according to any one of claims 1 to 7, characterized in that: The coil spring shaft notch (1301) is an arc-shaped notch; The spring box seat (1), the spring box (11) and the coil spring shaft (13) are coaxially arranged.

9. A planar scroll spring tightening method, based on the planar scroll spring tightening device according to any one of claims 1 to 8, characterized in that: The following steps are involved: 1] Assemble the spring box seat (1), the spring box (11), the coil spring shaft connecting assembly (9) and the coil spring shaft (13); 2] Install the coil spring (12) on the upper end of the spring box (11), and clamp the inner interface (1202) of the coil spring to the upper end of the coil spring shaft (13) through the coil spring shaft notch (1301), and at the same time clamp the outer interface (1201) of the coil spring to the other end of the tightening assembly (6); 3] Install the fixing assembly (7), the coil spring wrench (5) and the tightening assembly (6); 4] The coil spring wrench (5) is rotated and the tightening assembly (6) is driven to slide along the coil spring wrench (5) to tighten the coil spring (12).

10. A planar scroll spring tightening method according to claim 9, characterized in that: Also includes steps 5] and 6]: 5] After the coil spring (12) is tightened, install the coil spring (12) into the spring box (11), and connect the coil spring outer interface (1201) with the spring box notch (1101); 6】Remove the flat scroll spring tightening device.

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