Flat spiral spring tightening device and method

Abstract

The invention particularly relates to a flat spiral spring tightening device and method, and solves the problems that when an existing spiral spring is assembled, the spiral spring needs to be taken out repeatedly, and the assembly period is prolonged; and when the coil spring is loaded into a spring box, the coil spring is easily scratched, redundant materials are caused, and surface treatment of the coil spring is difficult to carry out. The invention discloses a flat spiral spring tightening device which comprises a spring box seat, a spiral spring shaft arranged in a spring box, a spiral spring wrench, a tightening assembly, a fixing assembly and a spiral spring shaft connecting assembly. The upper end of the coil spring shaft extends out of the upper end of the spring box, and the lower end penetrates through the inner bottom of the spring box to be connected with the coil spring shaft connecting assembly. The coil spring wrench is rotatably connected with the fixing assembly; the tightening assembly is matched with the coil spring outer connector and used for driving the coil spring outer connector to rotate to tighten the coil spring. The method disclosed by the invention can be used for the working processes of initial assembly, surface treatment, fine assembly, testing, secondary adjustment and the like of the coil spring.

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 spiral springs) have the advantages of small axial dimensions and large storage torque, and are increasingly widely used in aerospace organizations. Generally, after the parameters of the spiral spring are designed, when the spiral spring torque is large, it is impossible to directly wind the spiral spring by manpower. Therefore, it is necessary to determine the inner diameter of the spring box according to the outer diameter of the spiral spring in the free state. The inner diameter of the spring box is required to be larger than the outer diameter of the spiral spring in the free state, so that the spiral spring can be loaded into the spring box with less effort, and then wound to the working position. In special cases, due to space limitations, when the size of the spring box cannot be enlarged, before the spiral spring is loaded into the spring box, it is necessary to roll the finished spiral spring into a small outer diameter on the spring coiling machine, and then use iron wire to bind it. During installation, the entire spring is loaded into the spring box, and then the iron wire is cut to complete the assembly.

[0003] However, when used in the aerospace field, the size of the spring box cannot be made larger due to extreme space limitations. If the solution of winding the spring on a spring winding machine and then binding it with wire is adopted, there are the following disadvantages: 1. Since the spring has a large stored force, the wire can easily scratch the spring and cause excess material. 2. Coiled springs generally require special surface treatment, such as anti-cold welding. If they are wound on a spring winding machine, there is a risk of contaminating the surface of the parts and uncontrollable risks. 3. During assembly, the spring needs to be loaded into the spring box multiple times, and it is not a one-time operation. There is a step of taking it out during the process. If a spring winding machine is used to wind the spring, the assembly cycle will be extended.

[0004] In summary, the existing coil spring prolongs the production cycle when it is taken out; when it is loaded into the spring box, the coil spring is easily scratched, resulting in excess and making it difficult to perform surface treatment on the coil spring. 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 taken out repeatedly 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 it is difficult to perform surface treatment of the coil spring, and a planar scroll spring tightening device and method are provided.

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

[0007] A plane scroll spring tightening device is used to install a scroll spring into a spring box; the special feature of the device is that it includes a spring box seat, a scroll spring shaft arranged 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 fixing assembly, and the lower end of the spring box seat is used to connect to the external fixing 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 axially provided with a coil spring shaft notch 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 on 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 is rotatably connected to the fixing assembly;

[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 another flat plate, and a wrench rotating shaft for connecting to the fixing assembly is provided in the wrench center hole; the central axis of the wrench straight slot hole forms an angle θ with the central axis of the flat plate where the wrench center hole is located, 20°≤θ≤70°; one end of the handle is connected to the side of any one of the three flat plates, for pushing 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, 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] Further, 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 matching the lower end of the coil spring shaft is arranged; 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 cross plate; the lower ends of the pads are respectively connected to the spring box seats, and the upper ends are respectively connected to the cross plates; the upper end of the wrench shaft is fixedly connected to the cross 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 the 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 axial direction of the wrench straight slot hole; the sliding push rod is used to pass through the threaded hole and abut against the stop of the sliding pin;

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

[0020] Furthermore, the spring box seat includes a bottom plate, a connecting ring and a plurality of supporting columns; the lower end of the supporting column is connected to the bottom plate, and the upper end is connected to the connecting ring; the lower end of the cushion column is connected to the connecting ring; and the lower end of the spring box is connected to the bottom plate.

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

[0022] The spring box seat, the spring box and the winding 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, winding spring shaft connecting assembly and winding spring shaft;

[0025] 2] Install the coil spring on the upper end of the spring box, and clamp 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 clamp 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] Rotating the coil spring wrench drives the tightening assembly to slide along the coil spring wrench to tighten the coil spring.

[0028] Further, 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 place with the notch of the spring box;

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

[0031] Beneficial effects of the present invention:

[0032] 1. A planar scroll spring tightening device of the present invention can ensure that the surface of the scroll spring is subjected to anti-cold welding treatment when in a free state (the surface treatment cannot be performed in a wound state). After the surface treatment, the scroll spring can be stored in a small-sized spring box. After removing the device, subsequent assembly operations can be performed directly.

[0033] 2. The present invention provides a planar scroll spring tightening device, which reduces the requirement that the inner diameter of the spring box must be larger than the outer diameter of the planar scroll spring in a free state, thereby saving the space occupied by the spring box; it also avoids the complex 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 planar spiral spring tightening device of the present invention enables the volume of the spring box to be reduced, the coil spring to be enlarged, and the coil spring storage torque to be increased.

[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, thereby simplifying the process flow.

[0036] 5. The planar scroll spring tightening method of the present invention allows the operator to easily put the scroll spring into the spring box; during the production and development process, it 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 of 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 scroll spring is put 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 A cross-sectional view of

[0045] Figure 8 A schematic diagram of a planar scroll spring tightening device embodiment of the present invention after the scroll spring is inserted into a box.

[0046] Description of reference numerals:

[0047] 1. Spring box seat; 101. Bottom plate; 102. Connecting ring; 103. Support column; 2. Pad column; 3. Cross 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. Connector; 10. Limit 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] like Figure 1 , Figure 2 As shown, a planar spiral spring tightening device is used to install a spiral spring 12 into a spring box 11; it includes a spring box seat 1, a sliding push rod 8, a limit assembly 10 arranged in the spring box seat 1, a spiral spring shaft 13 arranged in the spring box 11, and a spiral spring wrench 5, a tightening assembly 6, a fixing assembly 7, and a spiral 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 spiral spring shaft connecting assembly 9 is composed of a connecting piece 902 and a protrusion 901; in order to facilitate installation, the spring box seat 1, the spring box 11 and the spiral spring shaft 13 are coaxially arranged.

[0050] 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; the bottom plate 101 is used to connect to the external fixed platform to fix the entire device. The spring box 11 is set in the spring box seat 1, the lower end of the spring box 11 is connected to the bottom plate 101, and the upper end of the spring box 11 is used to install 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 the upper end of the coil spring shaft 13 is axially provided with an arc-shaped coil spring shaft groove 1301 that is compatible with 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 manufacturing, the sliding pin stop 601, the sliding pin column 602 and the sliding pin upper cover plate 603 can be made in 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 at the lower part of 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 at the upper and lower sides of the spanner straight slot hole 501, which are used to limit the tilt of the sliding pin stop 601, so that it can translate along the spanner straight slot hole 501, and keep the sliding pin 602 always downward, and will not be disengaged from the coil spring 12 or cause it to get stuck when rotating. The sliding pin 602 is used to cooperate with the coil spring external interface 1201; the sliding pin stop 601 slides along the coil spring spanner 5 and drives 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 adapted to the sliding pin stop 601 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 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 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, and is used to push the closed triangular wrench to rotate along the wrench shaft 4, forming a sliding friction rotation pair; at the same time, the sliding pin column 602 is translated along the wrench straight slot hole 501. When the coil spring 12 is tightened, the sliding pin upper cover plate 603, the sliding pin stop 601 and the sliding pin lower cover plate 604 can slide along the wrench straight slot hole 501 to adapt to the change in the outer diameter of the coil spring 12.

[0054] The connecting piece 902 is a cylindrical structure, in which a limiting blind hole matching the lower end of the coil spring shaft 13 is arranged; 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 through the limiting blind hole; the limiting assembly 10 includes two limiting posts 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 piece 902, and the other end is arranged between the two limiting posts to limit the rotation of the coil spring shaft 13. In this embodiment, the two limiting posts are made of soft material copper alloy H62.

[0055] In this embodiment, the fixing assembly 7 is composed of two pads 2, a horizontal plate 3 and a spanner shaft 4. The lower ends of the two pads 2 are connected to the upper end of the spring box seat 1 by long screws, and the upper ends of the two pads 2 are connected to the two ends of the horizontal plate 3 by screws; the spanner shaft 4 is a T-shaped structure, the upper end of which is connected to the horizontal plate 3, and the lower end is provided with a limiting step, and the lower end passes through the spanner center hole 502 and is connected to the nut to prevent the coil spring spanner 5 from falling; the coil spring spanner 5 and the spanner shaft 4 are matched through a cylindrical stop; the limiting step is used to limit the axial movement of the closed triangle spanner.

[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 hole 504 is used to install a push rod to lengthen the operator's force arm, forming a lever, which is convenient for rotation and can also make the operator more labor-saving; a threaded hole 503 is provided on the flat plate 505 corresponding to the wrench straight slot hole 501, away from the end of the flat plate 505 connected to the handle 506, along the axial direction 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. The sliding push rod 8 can assist the sliding pin stop 601 in translation by rotating it to prevent the sliding pin stop 601 from not being able to translate smoothly in case 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 planar scroll spring tightening device, and the specific steps are as follows:

[0058] 1] Assemble the spring box seat 1, the spring box 11, the winding spring shaft connecting assembly 9 and the winding 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 connecting piece 902, then connect the spring box 11 to the bottom plate 101 of the spring box seat 1, and make the protrusion 901 located between the two limit posts;

[0061] 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 with the upper end of the coil spring shaft 13 through the arc-shaped coil spring shaft notch 1301. The outer interface 1201 of the coil spring does not overlap with the spring box notch 1101 in the radial direction and the circumferential direction before entering the box, and is in a free state; in other embodiments, if the coil spring 12 is designed to be tightened by rotating clockwise, it is only necessary to turn the upper and lower surfaces of the coil spring 12 upside down when installing it, and the device can be used to connect with the coil spring 12;

[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, and then fit the coil spring wrench 5 with the wrench shaft 4 through the wrench center hole 502 and fix 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. Pass the sliding pin stop 601 through the spanner straight slot hole 501, and 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 with screws to form a moving pair, and then screw the sliding push rod 8 into the threaded hole 503 through the thread;

[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] When 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 located directly above the spring box notch 1101, and then stops rotating; during the rotation process, if the sliding pin 602 does not slide smoothly due to large resistance, the real-time position of the sliding pin 602 can be adjusted by the sliding push rod 8;

[0069] 5] After the coil spring 12 is tightened, the coil spring 12 is installed into the spring box 11 by external force, and the coil spring outer interface 1201 is snapped into the spring box slot 1101 to complete the coil spring 12 entering the box. At this time, the coil spring outer interface 1201 is snapped into the spring box slot 1101, and the coil spring inner interface 1202 completely falls into the bottom of the coil spring shaft slot 1301; at this time, the spring box 11, coil spring 12, and coil spring shaft 13 form a whole;

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

[0071] Remove the planar scroll spring take-up device in sequence and it can be used 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 is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A planar spiral spring tightening device for inserting a spiral 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 axially provided with a coil spring shaft notch (1301) 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) via a fixing assembly (7), and the coil spring wrench (5) is rotatably connected to the fixing assembly (7); 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) for driving 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 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 plate (505), a wrench center hole (502) is provided in the middle of the other 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 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 at 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) comprises a connection piece (902) and a protrusion (901); The connecting piece (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 piece (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 cushion 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 wrench side holes (504), and the wrench side holes (504) are 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 at 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 spanner shaft (4), and the lower end passes through the spanner center hole (502) and is connected to the nut; the limiting step is used to limit the axial movement of the closed triangular spanner.

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 snap-fit ​​the coil spring outer interface (1201) with the spring box notch (1101); 6】Remove the flat scroll spring tightening device.

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