An operating mechanism assembly of a molded case circuit breaker

Abstract

An operating mechanism assembly for a molded case circuit breaker, characterized in that: a handle (1) is linked to a trip button (3) through a lever (2) to apply a driving force from bottom to top to the trip button (3) so that the trip button (3) rotates; during the rotation of the trip button (3), the trip button (3) can overlap with a lock button (4) to realize a loading button, or a rotating shaft (5) is driven by a four-bar structure to drive a moving contact (6) to rotate, and the contact and separation of the moving contact (6) and a stationary contact (7) realize the connection and disconnection of the molded case circuit breaker; the working length of the connecting rod (11) and the connecting rod (12), the distance from the pivot connection center of the lower end of the trip button (3) and the connecting rod (11) to the rotation center of the hinge shaft (10), and the predetermined angle between the distance between the hinge point of the rotating shaft (5) and the moving contact (6) and the hinge point of the rotating shaft (5) and the connecting rod (12) is set so that the rotation angle range of the moving contact (6) is greater than 50°. The design of a single four-bar linkage is more conducive to ensuring product stability and is easy to produce.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit breakers, and in particular relates to an operating mechanism assembly of a molded case circuit breaker. Background Art

[0002] Molded case circuit breakers are low voltage circuit protection devices that have overload, short circuit and undervoltage protection functions. There are many types of circuit breakers, among which molded case circuit breakers are more commonly used. The outer shell uses a plastic insulator to isolate the conductor and the grounded metal part. When the current exceeds the set value, the molded case circuit breaker can automatically cut off the current to protect the load.

[0003] The common molded case circuit breaker operating mechanism on the market often fixes the support frame on the base, and the rotating shaft, moving contact and four-bar linkage are installed inside the base cavity as an integral component. This structure is inconvenient to disassemble. When the operating mechanism needs to be repaired, the components of each functional component need to be disassembled in sequence, which increases the difficulty of disassembly.

[0004] Chinese patent ZL201820936981.4 discloses an optimized circuit breaker layout structure, including an arc extinguishing system, a static contact, a moving contact, a mechanism, a release and a rotating shaft, and also includes a left cover and a right cover, the left cover and the right cover are connected to each other in the left and right directions to form an integral structure, the release and the mechanism are arranged outside the integral structure, and the arc extinguishing system, the static contact, the moving contact and the rotating shaft are located inside the integral structure. The patented technology also provides an optimized N-level circuit breaker layout structure, 2≤N≤4, including N of the above-mentioned integral structures, all of which are arranged side by side, and the above-mentioned release and the mechanism are arranged outside any integral structure. The patented technology has good isolation performance; excellent insulation capacity between phases and between incoming and outgoing lines; high breaking capacity under high voltage levels; and solves the problem of particle backflush. However, in this technical solution, the support frame is fixed on the base, and the rotating shaft, the moving contact and the four-bar linkage are installed inside the base cavity as an integral component, and the installation of parts is complicated and the maintenance and disassembly are difficult. Summary of the invention

[0005] The purpose of the present invention is to provide an operating mechanism assembly of a molded case circuit breaker in view of the technical defects of the above-mentioned existing molded case circuit breaker operating mechanism components being complex to install and difficult to repair and disassemble. The design of a single four-bar linkage is more conducive to ensuring product stability and is easy to produce.

[0006] Technical Solution

[0007] In order to achieve the above technical purpose, the present invention provides an operating mechanism assembly of a molded case circuit breaker, which includes a handle, the handle is connected to a lever, and is characterized in that: the handle applies a driving force from bottom to top to the jump buckle through the lever and the jump buckle linkage to rotate the jump buckle, and the jump buckle can overlap with the lock buckle to realize the buckle loading during the rotation process, or the rotating shaft drives the moving contact to rotate through the four-bar structure, and the moving contact and the static contact are contacted and separated to realize the connection and disconnection of the molded case circuit breaker;

[0008] The lever is pivotally supported on a pair of side plates, the jumper is rotatably mounted between the pair of side plates through a hinge shaft, the jumper is pivotally connected to the lower end of the first connecting rod, the upper end of the first connecting rod is rotatably connected to the left end of the second connecting rod through a main shaft, the right end of the second connecting rod is rotatably connected to the rotating shaft through a boss shaft, and the moving contact is rotatably mounted on the rotating shaft;

[0009] The working length of the connecting rod 1 and the connecting rod 2, the distance between the pivot connection center of the jumper and the lower end of the connecting rod 1 and the rotation center of the hinge shaft, and the predetermined angle between the distance between the rotating shaft and the hinge point of the moving contact and the hinge point of the rotating shaft and the connecting rod 2, make the rotation angle range of the moving contact greater than 50°;

[0010] A spring is provided between the lever and the main shaft for connection. In the free tripping state, the angle range of the line connecting the spring center 1 at one end of the lever to the spring center 2 at one end of the main shaft and the line connecting the spring center 1 at one end of the lever to the rotation center of the lever pivotally supported on a pair of side plates is 2° to 10°;

[0011] The angle range of the line connecting the rotation center 1 at the left end of the second connecting rod to the rotation center 2 at the first end of the rotating shaft and the line connecting the rotation center 2 at the first end of the rotating shaft to the rotation center 3 of the moving contact is 130° to 140°;

[0012] The angle range of the line connecting the rotation center 4 at one end of the connecting rod to the rotation center 5 at the other end and the line connecting the rotation center 4 at one end of the connecting rod to the rotation center 6 at the other end of the jump buckle is 30° to 40°;

[0013] In the buckle-loading state, the jump buckle and the lock buckle are snap-fitted to lock the mechanism, and the line connecting the spring center 1 at one end of the lever to the spring center 2 at one end of the main shaft and the line connecting the spring center 1 at one end of the lever to the rotation center of the lever pivotally supported on a pair of side plates have an angle range of 5° to 15°;

[0014] During the buckle loading process of the operating mechanism, the main lever and the auxiliary lever rotate simultaneously from the rotation center 7, and the auxiliary lever drives the jump buckle to rotate around the hinge axis as the center, so that the jump buckle and the lock buckle cooperate with each other. After the buckle loading action is completed, the spring between the lever and the main shaft generates tension, so that the jump buckle and the lock buckle cannot be actively unlocked after they cooperate;

[0015] The angle range of the line connecting the rotation center 1 at the left end of the second connecting rod to the rotation center 2 at the first end of the rotating shaft and the line connecting the rotation center 2 at the first end of the rotating shaft to the rotation center 3 of the moving contact is 160° to 170°;

[0016] The angle range of the connecting line from the rotation center 4 at one end of the connecting rod to the rotation center 5 at the other end and the connecting line from the rotation center 4 at one end of the connecting rod to the rotation center 6 at the other end of the jump buckle is 40° to 50°;

[0017] In the closed state, the trip buckle and the lock buckle are snap-fitted to lock the mechanism, and the line connecting the spring center 1 at one end of the lever to the spring center 2 (b) at one end of the main shaft and the line connecting the spring center 1 at one end of the lever to the rotation center of the lever pivotally supported on a pair of side plates have an angle range of 15° to 25°;

[0018] The angle range of the line connecting the rotation center 1 at the left end of the second connecting rod to the rotation center 2 at the first end of the rotating shaft and the line connecting the rotation center 2 at the first end of the rotating shaft to the rotation center 3 of the moving contact is 100° to 110°;

[0019] The angle range of the line connecting the rotation center four at one end of the connecting rod to the rotation center five at the other end and the line connecting the rotation center four at one end of the connecting rod to the rotation center six at the other end of the jump buckle is 15° to 25°.

[0020] Beneficial Effects

[0021] The present invention provides an operating mechanism assembly of a molded case circuit breaker, which makes the rotation angle range of the moving contact greater than 50° by setting a predetermined angle between the working length of the connecting rod 1 and the connecting rod 2, the distance between the pivot connection center of the lower end of the jumper and the connecting rod 1 to the rotation center of the hinge shaft, and the distance between the hinge point of the rotating shaft and the moving contact and the hinge point of the rotating shaft and the connecting rod 2. The various functional components inside the molded case circuit breaker can be installed in a modular manner. During installation or maintenance, only the corresponding faulty part needs to be disassembled, without the need to disassemble the entire irrelevant functional components, which greatly reduces the difficulty of assembly and maintenance of the molded case circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Attached Figure 1 This is a schematic diagram of an operating mechanism in an embodiment of the present invention;

[0023] Attached Figure 2 This is a schematic diagram of the lever of the operating mechanism in the embodiment of the present invention;

[0024] Attached Figure 3 It is a schematic diagram of the installation position of the side plate and the middle cover of the supporting frame in an embodiment of the present invention;

[0025] Attached Figure 4It is a schematic diagram of the relative positions of the traction rod, mechanism and rotating shaft in an embodiment of the present invention;

[0026] Attached Figure 5 It is a schematic diagram of the relative positions of various components after the buckle loading action is completed in the embodiment of the present invention;

[0027] Attached Figure 6 It is a schematic diagram of the relative positions of various components after the closing action of the embodiment of the present invention is completed;

[0028] Attached Figure 7 Schematic diagram of a four-bar linkage mechanism in an embodiment of the present invention;

[0029] Attached Figure 8 Schematic diagram of the installation position of the lever in the embodiment of the present invention;

[0030] Attached Fig. 9 This is a schematic diagram of the position limiting after the lever is installed according to an embodiment of the present invention;

[0031] Attached Fig.10 Schematic diagram of the installation position of the spring in the embodiment of the present invention;

[0032] Attached Fig.11a Schematic diagram of the relative positions of the components in the free tripping state of the embodiment of the present invention Figure 1 ;

[0033] Attached Fig.11b Schematic diagram of the relative positions of the components in the free tripping state of the embodiment of the present invention Figure 2 ;

[0034] Attached Fig.12a Schematic diagram of the relative positions of various components in the buckle-loading state of the embodiment of the present invention Figure 1 ;

[0035] Attached Figure 12b Schematic diagram of the relative positions of various components in the buckle-loading state of the embodiment of the present invention Figure 2 ;

[0036] Attached Fig.13a The relative positions of the components in the embodiment of the present invention in the closed state are shown in FIG. Figure 1 ;

[0037] Attached Fig.13b The relative positions of the components in the embodiment of the present invention in the closed state are shown in FIG. Figure 2 ; DETAILED DESCRIPTION

[0038] 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.

[0039] Example

[0040] An embodiment of the present invention provides an operating mechanism assembly of a molded case circuit breaker, as shown in the attached Figure 1 , as shown in 2, 3 and 4, it includes a handle 1, which is connected to a lever 2. The handle 1 is linked with a trip buckle 3 through the lever 2 to apply a bottom-up driving force to the trip buckle 3 so that the trip buckle 3 rotates. During the rotation of the trip buckle 3, it can overlap with the lock buckle 4 to realize the loading buckle, or drive the rotating shaft 5 through a four-bar structure to drive the moving contact 6 to rotate. The contact and separation of the moving contact 6 and the static contact 7 realize the connection and disconnection of the molded case circuit breaker.

[0041] Specifically, as attached Figure 8 , 9 and 10, the lever 2 is mounted on the frame 8, the frame 8 includes a pair of side plates, the pair of side plates are mounted on the middle cover 9, and the handle 1 is inserted into the slot arranged on the middle cover 9. The lever 2 includes a main lever 2a and a secondary lever 2b, the main lever 2a is arranged between the pair of side plates, the secondary lever 2b is pivotally supported on the pair of side plates, and the lever 2 and the pair of side plates mutually restrict the freedom of horizontal forward and backward movement. The line connecting the rotation center of the lever 2 to the top of the main lever 2a and the line connecting the rotation center of the lever 2 to the top of the secondary lever 2b form an angle r of 90° to 180°. A spring 16 is arranged between the secondary lever 2b and the main shaft 13 to limit the position of the secondary lever 2b on the pair of side plates. One end of the spring 16 is connected to the main shaft 13, and the other end is connected to the bottom of the lever 2b. The auxiliary lever 2b is provided with an arc-shaped protrusion 2b01, and the pair of side plates are provided with an arc-shaped groove 801 corresponding to the arc-shaped protrusion 2b01. The arc-shaped protrusion 2b01 is located in the arc-shaped groove 801 to realize the pivotal support of the auxiliary lever 2b on the pair of side plates, thereby limiting the closing and opening and tripping movement trajectory of the lever 2. The main lever 2a and the auxiliary lever 2b are U-shaped, and the U-shaped side arms of the main lever 2a and the U-shaped side arms of the auxiliary lever 2b are fixedly installed together by welding or riveting, and the U-shaped side arms of the main lever 2a are in contact with the inner side surfaces of the pair of side plates.

[0042] As attached Figure 1As shown in Figures 5, 6 and 7, the jump catch 3 is rotatably mounted between the pair of side plates through a hinge shaft 10, and the lock catch 4 is mounted between the pair of side plates through a lock catch pivot shaft 18. The lock catch 4 and the jump catch 3 cooperate with each other to lock or unlock the mechanism. The jump catch 3 is pivotally connected to the lower end of the connecting rod 11, and the rotation center of the pivot connection is O1. The upper end of the connecting rod 11 is rotationally connected to the left end of the connecting rod 2 12 through a main shaft 13, and the rotation center is denoted as A. The right end of the connecting rod 2 12 is rotationally connected to the rotating shaft 5 through a boss shaft 14, and the rotation center is denoted as B. The rotating shaft 5 is rotatably mounted between the pair of side plates, and the rotation center is denoted as O2. Lines O1A, AB, and BO2 form a single four-bar linkage, and the moving contact 6 is rotatably mounted on the rotating shaft 5. A contact spring for providing pre-tightening force is arranged between the moving contact 6 and the rotating shaft 5 to provide contact pressure when the mechanism is closed. The traction rod 15, the lever 2 and the rotating shaft 5 are distributed in the left, middle and right directions.

[0043] When the operating mechanism is in a free tripping state, the position of the tripping buckle 3 is limited by the limit block on the supporting frame 8, and the lever 2 is provided with a pulling force by the spring 16. After contacting with the tripping buckle 3, it remains stable, and the tripping buckle 3 remains stable after contacting with the limit shaft 17; the rotating shaft 5 is limited by the contact of the limit baffle plate on the supporting frame 8 with the boss shaft 14, thereby determining the tripping state of the connecting rod 11, the connecting rod 2 12 and the rotating shaft 5.

[0044] During the buckle-carrying action of the operating mechanism, the main lever 2a and the auxiliary lever 2b rotate simultaneously from the rotation center 7A, and the auxiliary lever 2b drives the jump buckle 3 to rotate around the hinge shaft 10, so that the jump buckle 3 and the lock buckle 4 cooperate with each other. After the buckle-carrying action is completed, a pulling force is generated by the spring 16 between the lever 2 and the main shaft 5, so that the jump buckle 3 and the lock buckle 4 cannot be actively unlocked after cooperation.

[0045] In this embodiment, the working length of the connecting rod 11 and the connecting rod 2 12, the distance between the pivot connection center of the lower end of the jumper 3 and the connecting rod 11 and the rotation center of the hinge shaft 10, and the predetermined angle between the hinge point of the rotating shaft 5 and the moving contact 6 and the hinge point of the rotating shaft 5 and the connecting rod 2 12 make the rotation angle range of the moving contact 6 greater than 50°. In order to achieve the purpose of the above-mentioned moving contact rotation range greater than 50°, as shown in the attached Fig.11a and 11bAs shown, in the free tripping state, the angle range of the line connecting the spring center a at one end of the lever 2 to the spring center b at one end of the main shaft 13 and the line connecting the spring center a at one end of the lever 2 to the rotation center c of the lever 2 pivotally supported on a pair of side plates is 2° to 10°; the angle range of the line connecting the rotation center d at the left end of the connecting rod 2 12 to the rotation center e at one end of the rotating shaft 5 and the line connecting the rotation center e at one end of the rotating shaft 5 to the rotation center f of the moving contact 6 is 130° to 140°; the angle range of the line connecting the rotation center 4g at one end of the connecting rod 11 to the rotation center 5h at the other end and the line connecting the rotation center 4g at one end of the connecting rod 11 to the rotation center 6i at the other end of the jump buckle 3 is 30° to 40°;

[0046] As attached Fig.12a and 12b As shown, in the buckle-loading state, the jump buckle 3 and the lock buckle 4 are snap-fitted to lock the mechanism, and the line connecting the spring center a at one end of the lever 2 to the spring center b at one end of the main shaft 13 and the line connecting the spring center a at one end of the lever 2 to the rotation center c of the lever 2 pivotally supported on a pair of side plates have an angle range of 5° to 15°;

[0047] The angle range of the line connecting the rotation center 1d at the left end of the connecting rod 12 to the rotation center 1e at one end of the rotating shaft 5 and the line connecting the rotation center 1e at one end of the rotating shaft 5 to the rotation center 3f of the moving contact 6 is 160° to 170°; the angle range of the line connecting the rotation center 4g at one end of the connecting rod 11 to the rotation center 5h at the other end and the line connecting the rotation center 4g at one end of the connecting rod 11 to the rotation center 6i at the other end of the jump buckle 3 is 40° to 50°.

[0048] As attached Fig.13a and 3 As shown in b, in the closed state, the jumper 3 and the lock buckle 4 are snap-fitted to lock the mechanism, and the angle range of the line connecting the spring center a at one end of the lever 2 to the spring center b at one end of the main shaft 13 and the line connecting the spring center a at one end of the lever 2 to the rotation center c of the lever 2 pivotally supported on a pair of side plates is 15° to 25°; the angle range of the line connecting the rotation center d at the left end of the connecting rod 12 to the rotation center e at one end of the rotating shaft 5 and the line connecting the rotation center e at one end of the rotating shaft 5 to the rotation center f of the moving contact 6 is 100° to 110°; the angle range of the line connecting the rotation center 4g at one end of the connecting rod 11 to the rotation center 5h at the other end and the line connecting the rotation center 4g at one end of the connecting rod 11 to the rotation center 6i at the other end of the jumper 3 is 15° to 25°.

[0049] An operating mechanism assembly of a molded case circuit breaker provided by an embodiment of the present invention fixes a supporting frame on a cover in the product, and a rotating shaft contact assembly and a mechanism assembly form an independent module, which makes it more convenient to disassemble and assemble the mechanism separately. At the same time, the design of a single four-bar linkage is more conducive to ensuring product stability and facilitating production. At the same time, the adjustment of the internal layout structure of the molded case circuit breaker enables modular installation of various functional components inside the molded case circuit breaker. During installation or maintenance, only the corresponding faulty part needs to be disassembled, without the need to disassemble the entire irrelevant functional components, which greatly reduces the difficulty of assembly and maintenance of the molded case circuit breaker.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0051] The structures, proportions, sizes, quantities, etc. illustrated in the accompanying drawings of the embodiments of the present invention are only used to match the contents disclosed in the specification so as to be understood and read by those familiar with the technology, and are not used to limit the limiting conditions that the present invention can be implemented, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects that the present invention can produce and the purposes that can be achieved. At the same time, the terms such as "upper", "lower", "left", "right", "middle", "clockwise", "counterclockwise", etc. cited in this specification are only for the convenience of narration, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of the relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

Claims

1. An operating mechanism assembly of a molded case circuit breaker, comprising a handle (1), wherein the handle (1) is connected to a lever (2), and characterized in that: The handle (1) is linked to the trip buckle (3) through the lever (2) to apply a driving force from bottom to top to the trip buckle (3), so that the trip buckle (3) rotates. During the rotation of the trip buckle (3), it can overlap with the lock buckle (4) to realize the buckle loading, or drive the rotating shaft (5) through the four-bar structure to drive the moving contact (6) to rotate, and the moving contact (6) and the static contact (7) are in contact and separated to realize the connection and disconnection of the molded case circuit breaker. The lever (2) is pivotally supported on a pair of side plates, the jumper (3) is rotatably mounted between the pair of side plates via a hinge shaft (10), the jumper (3) is pivotally connected to the lower end of the first connecting rod (11), the upper end of the first connecting rod (11) is rotatably connected to the left end of the second connecting rod (12) via a main shaft (13), the right end of the second connecting rod (12) is rotatably connected to the rotating shaft (5) via a boss shaft (14), and the moving contact (6) is rotatably mounted on the rotating shaft (5); The working lengths of the connecting rod 1 (11) and the connecting rod 2 (12), the distance between the pivot connection center of the lower end of the jumper (3) and the connecting rod 1 (11) and the rotation center of the hinge shaft (10), and the predetermined angle between the distance between the hinge point of the rotating shaft (5) and the moving contact (6) and the hinge point of the rotating shaft (5) and the connecting rod 2 (12), so that the rotation angle range of the moving contact (6) is greater than 50°; A spring (16) is provided between the lever (2) and the main shaft (13) for connection. In a free tripping state, the angle between a line connecting the spring center 1 (a) at one end of the lever (2) to the spring center 2 (b) at one end of the main shaft (13) and a line connecting the spring center 1 (a) at one end of the lever (2) to the rotation center (c) of the lever (2) pivotally supported on a pair of side plates is 2° to 10°. The angle between the line connecting the left end rotation center 1 (d) of the second connecting rod (12) to the rotation center 2 (e) of the first end of the rotating shaft (5) and the line connecting the rotation center 2 (e) of the first end of the rotating shaft (5) to the rotation center 3 (f) of the moving contact (6) is 130° to 140°; The angle between the line connecting the rotation center 4 (g) at one end of the connecting rod 1 (11) to the rotation center 5 (h) at the other end and the line connecting the rotation center 4 (g) at one end of the connecting rod 1 (11) to the rotation center 6 (i) at the other end of the jump buckle (3) is 30° to 40°; In the buckle-loading state, the jump buckle (3) and the lock buckle (4) are snap-fitted to lock the mechanism, and the line connecting the spring center one (a) at one end of the lever (2) to the spring center two (b) at one end of the main shaft (13) and the line connecting the spring center one (a) at one end of the lever (2) to the rotation center (c) of the lever (2) pivotally supported on a pair of side plates have an angle range of 5° to 15°; During the buckle-carrying action of the operating mechanism, the main lever (2a) and the auxiliary lever (2b) rotate simultaneously from the rotation center 7 (A), and the auxiliary lever (2b) drives the jump buckle (3) to rotate around the hinge shaft (10), so that the jump buckle (3) and the lock buckle (4) cooperate with each other. After the buckle-carrying action is completed, a tension force is generated by the spring (16) between the lever (2) and the main shaft (5), so that the jump buckle (3) and the lock buckle (4) cannot be actively unlocked after they cooperate. The angle range of the line connecting the rotation center 1 (d) of the left end of the second connecting rod (12) to the rotation center 2 (e) of the one end of the rotating shaft (5) and the line connecting the rotation center 2 (e) of the one end of the rotating shaft (5) to the rotation center 3 (f) of the moving contact (6) is 160° to 170°; The angle between the line connecting the rotation center 4 (g) at one end of the connecting rod 1 (11) to the rotation center 5 (h) at the other end and the line connecting the rotation center 4 (g) at one end of the connecting rod 1 (11) to the rotation center 6 (i) at the other end of the jump buckle (3) is 40° to 50°; In the closed state, the trip buckle (3) and the lock buckle (4) are snap-fitted to lock the mechanism, and the line connecting the spring center one (a) at one end of the lever (2) to the spring center two (b) at one end of the main shaft (13) and the line connecting the spring center one (a) at one end of the lever (2) to the rotation center (c) of the lever (2) pivotally supported on a pair of side plates have an angle range of 15° to 25°; The angle range of the line connecting the rotation center 1 (d) of the left end of the second connecting rod (12) to the rotation center 2 (e) of the first end of the rotating shaft (5) and the line connecting the rotation center 2 (e) of the first end of the rotating shaft (5) to the rotation center 3 (f) of the moving contact (6) is 100° to 110°; The angle between the line connecting the rotation center four (g) at one end of the connecting rod one (11) to the rotation center five (h) at the other end and the line connecting the rotation center four (g) at one end of the connecting rod one (11) to the rotation center six (i) at the other end of the jump buckle (3) is 15° to 25°.

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