Operating mechanism for controlling opening and closing of switch contact

Abstract

The utility model relates to an operating mechanism for controlling closing and opening of a switch contact. The operating mechanism comprises a shell, a side operating wheel, a coupling piece, a rotating shaft assembly in transmission connection with the side operating wheel and the coupling piece, and a spring assembly. One end of the spring assembly abuts against the rotating shaft assembly, and the other end of the spring assembly is rotationally connected to the shell. The rotating shaft assembly comprises a linkage shaft, a lever piece, a first supporting shaft eccentrically arranged on the lever piece and a driving plate. The side operation wheel and the lever sheet synchronously rotate through the linkage shaft; the driving plate is in transmission connection with the coupling piece; the rotating shaft assembly elastically abuts against the spring assembly through the first supporting shaft. The first supporting shaft extends out of the lever sheet to form an extending end; an idle stroke groove is formed in the outer edge of the driving plate, and the extending end is rotationally arranged in the idle stroke groove. Compared with the prior art, the utility model can realize quick switching-on and switching-off, reduce the ablation of arc to the contact, and have the functions of top operation and side operation, and the top operation and the side operation can correctly indicate the switching-on and switching-off states of the switch.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances and relates to an operating mechanism for controlling the closing and opening of switch contacts. Background Art

[0002] Switches in the low-voltage electrical field are used to control the disconnection and connection of circuits. They open and close quickly to minimize the impact of arcs. At present, most of them need to use external forces applied by handles to drive the switch operating mechanism, thereby driving the switch moving contact to achieve the switching of the switch state. Due to the limitations of the cabinet or installation position, users sometimes need to operate the switch from different directions, such as the front or side. When performing lateral operation, in order to achieve rapid switching of the switch, an idle stroke is usually designed in the transmission stroke between the lateral operating device and the switch operating mechanism, so that the main spring in the operating mechanism can drive the moving contact to move quickly without being interfered by the lateral operating device after passing the dead point. However, due to the existence of this idle stroke, the lateral operating device cannot be stabilized at the two positions corresponding to the switch closing position and the corresponding switch opening position. When the switch is running, the lateral operating device may deviate from the above two positions, resulting in unclear indications, which seriously affects the safety of the switch operation. In addition, most of the lateral operating devices and operating mechanisms on the market currently use two sets of bevel gears for linkage cooperation, which not only has low transmission efficiency, but also requires a large installation and transmission space for bevel gear transmission, which makes the corresponding switch's external dimensions larger. At the same time, the processing cost and manufacturing difficulty of the switch will also increase accordingly.

[0003] In response to the above problems, Chinese patent CN202321020800.0 discloses an operating mechanism, including an operating mechanism, a contact system and a lateral operating device, wherein the operating mechanism drives the moving contact of the contact system to rotate and cooperate with the static contact to realize the closing and opening of the switch, and the lateral operating device includes a lateral operating shaft and an elastic member, one end of the lateral operating shaft is exposed from the switch housing, and the other end is connected to the operating mechanism, and the lateral operating shaft rotates coaxially with the moving contact to drive the moving contact to move through the operating mechanism; the lateral operating shaft has a first position corresponding to the closing of the switch and a second position corresponding to the opening of the switch, when the lateral operating shaft is between the above two positions, the elastic member acts on the lateral operating shaft to make it have a tendency to move toward the above two positions, and when the lateral operating shaft is at any of the above two positions, the elastic member acts on the lateral operating shaft to stabilize it at this position. The lateral operating device has clear indications and high operational safety; the lateral operating shaft is directly connected to the operating mechanism, with good transmission efficiency, high operational reliability, simple overall structure, few parts, and low cost; the idle stroke design of the lateral operating shaft and the drive unit during the transmission process, combined with the spring mechanism, realizes human-free operation. However, the lateral operation has an idle stroke, which causes the lateral operation to fail to correctly indicate the switch closing and opening states, so the patent discloses a lateral operating structure, but the lateral operating part needs to protrude from the housing as a whole, increasing the overall width of the switch. Utility Model Content

[0004] The purpose of the utility model is to provide an operating mechanism for controlling the closing and opening of switch contacts. When the mechanism is operated manually, it can achieve rapid closing and opening, reduce the erosion of contacts by electric arc, and at the same time have the functions of top operation and side operation. Both top and side operations can correctly indicate the closing and opening status of the switch.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] An operating mechanism for controlling the closing and opening of switch contacts, comprising a housing, a side operating wheel and a coupling member arranged on the housing, a rotating shaft assembly rotatably arranged in the housing and used for transmission connection between the side operating wheel and the coupling member, and a spring assembly arranged between the rotating shaft assembly and the housing;

[0007] One end of the spring assembly is in contact with the rotating shaft assembly, and the other end is rotatably connected to the housing;

[0008] The rotating shaft assembly includes a linkage shaft, a lever sheet, a first support shaft eccentrically arranged on the lever sheet relative to the linkage shaft, and a drive plate coaxially arranged with the linkage shaft; the side operating wheel and the lever sheet rotate synchronously through the linkage shaft; the drive plate is in transmission connection with the coupling member;

[0009] The rotating shaft assembly is elastically abutted against the spring assembly via the first supporting shaft;

[0010] The first support shaft extends out of the lever sheet to form an extended end;

[0011] The outer edge of the driving plate is provided with an idle travel groove, and the extended end is rotatably arranged in the idle travel groove so that

[0012] When the side operating wheel drives the lever plate to rotate, the spring assembly is compressed, and the protruding end moves in the idle travel groove until it abuts against the side wall of the idle travel groove, so that the protruding end can drive the coupling to rotate through the driving plate. After the protruding end rotates until the direction of the elastic force of the spring assembly passes over the linkage shaft, the elastic potential energy of the spring assembly is released and quickly pushes the driving plate to drive the coupling to rotate.

[0013] Furthermore, the linkage shaft comprises a shaft body with a polygonal cross section, a hole groove matching the shape of the shaft body is formed on one side of the side operating wheel, and a through hole matching the shape of the shaft body is formed on the lever sheet;

[0014] The side operating wheel and the lever sheet rotate synchronously with the linkage shaft through corresponding hole slots or through holes.

[0015] Furthermore, the linkage shaft also includes a circular shaft arranged at one end of the shaft body, and a circular hole matched with the circular shaft is opened on one side of the coupling, and the circular shaft and the circular hole rotate relative to each other.

[0016] Furthermore, a synchronous rotating platform is provided on one side of the coupling, and the synchronous rotating platform includes an annular platform sleeved outside the circular hole, and a plurality of outer bosses spaced apart on the outer edge of the annular platform;

[0017] The driving plate is provided with a synchronous rotation hole adapted to the shape of the synchronous rotation platform;

[0018] The driving plate and the coupling member realize synchronous rotation with the synchronous rotation platform through the synchronous rotation hole.

[0019] Furthermore, the lever sheet is provided with a hole for the first supporting shaft to pass through.

[0020] Furthermore, a lever piece limit platform is provided on the lever piece; a first V-shaped limit platform is provided in the housing;

[0021] The bottom side of the lever piece limiting platform can be abutted against the two sides of the first V-shaped limiting platform in turn during the rotation process, so that the rotation is limited within the housing.

[0022] Furthermore, a pair of limiting bosses are symmetrically arranged on the center of the driving plate; and a pair of second V-shaped limiting bosses are arranged opposite to each other in the housing;

[0023] The drive plate can be pushed by the extended end to abut against the second V-shaped limit platform during the rotation process to cause the circuit breaker to close. At this time, one end of the idle travel groove abuts against the extended end, and the other end is located on the connecting line between the rotating connection end of the spring assembly and the linkage shaft.

[0024] Furthermore, the lever sheet is provided with a gear transmission surface;

[0025] The operating mechanism also includes a top operating wheel extending out of the housing, and a transmission assembly for transmission connecting the top operating wheel and the lever sheet;

[0026] The transmission assembly includes a slider which is laterally slidably arranged in the housing, a rack arranged at the bottom of the slider, and a toothed groove arranged on the slider;

[0027] The top operating wheel is rotatably mounted on the slider, and a gear is provided at the bottom. The gear meshes with the toothed groove, and the rack meshes with the gear transmission surface, so that

[0028] When the top operating wheel is rotated, the slider is driven to move laterally through the gear and the toothed groove, and then the lever piece is driven to rotate through the rack and the gear transmission surface.

[0029] Further, the spring assembly includes a spring bracket, a spring, a support plate and a second support shaft;

[0030] One end of the spring bracket is a U-shaped frame, and the other end is provided with a U-shaped slot; the U-shaped frame is in contact with the first support shaft;

[0031] The support plate is slidably sleeved on the spring bracket;

[0032] The two ends of the spring are respectively in contact with the bottom of the U-shaped frame and the support plate;

[0033] The second support shaft is in contact with the bottom side of the support plate and is slidably embedded in the U-shaped slot;

[0034] The second supporting shaft is fixed in the shell.

[0035] Furthermore, a bracket is provided in the shell, and the second supporting shaft is mounted on the bracket.

[0036] Compared with the prior art, the utility model has the following beneficial effects:

[0037] The utility model places the idle stroke inside the operating mechanism, and the side operating structure is directly linked with the spring inside the mechanism, which effectively solves the problem that the switch opening and closing states cannot be correctly indicated due to the side operation idle stroke, and the side operating part does not need to protrude from the side housing as a whole.

[0038] The utility model has the advantages of small size, small occupied space, reduced overall width of the switch, simple use of parts, reduced costs, etc., and can be suitable for top and side manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 , Figure 2 This is a structural schematic diagram of an operating mechanism for controlling the closing and opening of switch contacts of the utility model;

[0040] Figure 3 This is an internal schematic diagram of an operating mechanism for controlling the closing and opening of switch contacts of the utility model;

[0041] Figure 4 It is a transmission diagram of the top operating wheel;

[0042] Figure 5 is a schematic diagram of the structure of the spring assembly;

[0043] Figure 6 is a structural schematic diagram of a rotating shaft assembly;

[0044] Figure 7 This is an exploded view of the shaft assembly;

[0045] Figure 8 It is a structural schematic diagram of the side operating wheel;

[0046] Fig. 9 It is a structural schematic diagram of the driving board;

[0047] Fig.10 It is a structural schematic diagram of the lever piece;

[0048] Fig.11 is a schematic diagram of the structure of the half shell;

[0049] Fig.12 It is the structural diagram of the linkage shaft;

[0050] Fig.13 It is a structural schematic diagram of the coupling;

[0051] Fig.14 It is a schematic diagram of the opening state of an operating mechanism for controlling the closing and opening of switch contacts of the utility model;

[0052] Fig.15 It is a schematic diagram of the closing state of an operating mechanism for controlling the closing and opening of switch contacts of the utility model;

[0053] Fig.16 It is a schematic diagram of the opening over-dead point state of an operating mechanism for controlling the closing and opening of switch contacts of the utility model;

[0054] Among them: 1 is a housing, 2 is a top operating wheel, 3 is a side operating wheel, 4 is a coupling, 5 is a bracket, 6 is a slider assembly, 7 is a spring assembly, 8 is a shaft assembly, 9 is a lever sheet, 12 is a first V-shaped limit platform, 13 is a second V-shaped limit platform, 21 is a gear, 31 is a fourth circumferential limit surface, 32 is a first circular axis surface, 41 is a third circumferential limit surface, 42 is a first circular hole surface, 61 is a slider, 62 is a rack, 71 is a spring, 72 is a spring The bracket, 73 is the support plate, 74 is the second support shaft, 91 is the hole, 912 is the fifth circumferential limiting surface, 913 is the lever sheet limiting platform, 914 is the gear transmission surface, 92 is the first support shaft, 93 is the drive plate, 931 is the first circumferential limiting surface, 932 is the first driving surface, 933 is the second driving surface, 934 is the first limiting surface, 935 is the second circular hole surface, 94 is the linkage shaft, 941 is the second circumferential limiting surface, and 942 is the second circular axis surface. DETAILED DESCRIPTION

[0055] The following embodiments are implemented based on the above technical solution of the utility model, and provide detailed implementation methods and specific operation processes, but the protection scope of the utility model is not limited to the following embodiments.

[0056] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0057] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0058] Example:

[0059] This embodiment provides an operating mechanism;

[0060] The main components and features are: 1. Shell; 2. Top operating wheel; 3. Side operating wheel; 4. Coupling; 5. Bracket; 6. Slider assembly; 7. Spring assembly; 8. Rotating shaft assembly; 9. Lever; 12. First V-shaped limit platform; 13. Second V-shaped limit platform; 21. Gear; 31. Fourth circumferential limit surface; 32. First circular axis surface; 41. Third circumferential limit surface; 42. First circular hole surface; 61. Slider; 62. Rack; 71. Spring; 72 , spring bracket; 73, support plate; 74, second support shaft; 91, hole; 912, fifth circumferential limit surface; 913, lever piece limit platform; 914, gear transmission surface; 92, first support shaft; 93, drive plate; 931, first circumferential limit surface; 932, first drive surface; 933, second drive surface; 934, first limit surface; 935, second circular hole surface; 94, linkage shaft; 941, second circumferential limit surface; 942, second circular axis surface.

[0061] Working principle:

[0062] like Figure 1 and Figure 2 As shown, the operating mechanism is integrally arranged in a housing 1 consisting of two connected parts. The top operating wheel 2 protruding from the top and the side operating wheel 3 protruding from the side are used for manual operation. The other side is provided with a coupling 4 which does not protrude from the housing 1 and is used to connect the contact module of the switch. The coupling 4 rotates together with the contacts.

[0063] like Figure 3 As shown, the top operating wheel 2 and the side operating wheel 3 are rotatable, and the rotation axes of the two are perpendicular to each other; the slider assembly 6 is arranged in the shell 1 and can slide in the front and rear directions, and the bracket 5 is fixedly installed in the shell 1 and arranged in pairs in the front and rear directions; the shaft assembly 8 is rotatably arranged in the shell 1, and its rotation axis is coaxial with the side operating wheel 3. Spring assemblies 7 are also arranged in pairs in the front and rear directions, one end of which abuts on the bracket 5 and the other end abuts on the shaft assembly 8.

[0064] like Figure 3 and Figure 4 As shown, the gear 21 is fixed below the top operating wheel 2, and the slider assembly 6 is formed by a slider 61 and a rack 62 fixedly connected. When the top operating wheel 2 rotates, the gear 21 can drive the slider 61 to slide back and forth.

[0065] like Figure 5 As shown, the spring assembly 7 consists of a spring 71, a spring bracket 5, a support plate 73, and a second support shaft 74. The spring 71 is sleeved in the spring bracket 5 arranged in pair, with one end abutting against the spring bracket 5 and the other end abutting against the support plate 73. The support plate 73 abuts against the second support shaft 74.

[0066] like Figure 6As shown, the spring bracket 5 abuts against the first support shaft 92, and the second support shaft 74 abuts against the bracket 5; the lever piece 9 and the drive plate 93 are arranged in pairs on the linkage shaft 94 in the left and right directions to form a rotating shaft assembly 8, and the drive plate 93 is located outside the lever piece 9.

[0067] like Figure 8 As shown, the side operating wheel 3 has a fourth circumferential limiting surface 31 and a first circular axis surface 32 on the outer circumferential direction.

[0068] like Fig. 9 As shown, the inner side of the circumference of the driving plate 93 is provided with a second circular hole surface 935 and a first circumferential limiting surface 931, and the outer side of the circumference is provided with a first driving surface 932, a second driving surface 933 and a first limiting surface 934. The three form a group, and the two groups of structures are arranged symmetrically on the center of the circle.

[0069] like Fig.10 As shown, a fifth circumferential limiting surface 912 is provided inside the lever piece 9, two holes 91 are symmetrically arranged on the circumference, and a gear transmission surface 914 is provided on one side of the side perpendicular to the hole 91, and a lever piece limiting platform 913 is provided on the other side; Figure 3 As shown, the rack 62 cooperates with the gear transmission surface 914, and the sliding of the rack 62 drives the lever piece 9 to rotate.

[0070] like Fig.12 As shown, the linkage shaft 94 is provided with a second circumferential limiting surface 941 in the circumferential direction, and a second circular shaft surface 942 is provided at one end.

[0071] like Fig.13 As shown, a raised third circumferential limiting surface 41 is provided at one end of the coupling 4, and a first circular hole surface 42 is provided on the inner side of the circumference.

[0072] like Figure 7 As shown, the fourth circumferential limit surface 31 of the side operating wheel 3 cooperates with the second circumferential limit surface 941 of the linkage shaft 94, and the fifth circumferential limit surface 912 of the two lever pieces 9 cooperates with the second circumferential limit surface 941 of the linkage shaft 94, and the three rotate together.

[0073] like Figure 7 As shown, the third circumferential limiting surface 41 of the coupling 4 cooperates with the first circumferential limiting surface 931 of the driving plate 93 beside the coupling 4, and the two rotate together.

[0074] like Figure 7 As shown, the first circular hole surface 42 of the coupling 4 is matched with the second circular shaft surface 942 of the linkage shaft 94, and the two rotate relative to each other.

[0075] like Figure 7As shown, the first circular axial surface 32 of the side operating wheel 3 is axially matched with the second circular hole surface of the driving plate 93 beside the side operating wheel 3, and the two rotate relative to each other.

[0076] like Figure 6 and Figure 7 As shown, the first support shaft 92 matches with the hole 91 of the lever piece 9 , and the length of the first support shaft 92 is longer than the two side surfaces of the two lever pieces 9 .

[0077] like Fig.11 As shown, a first V-shaped limit platform 12 and a second V-shaped limit platform 13 are provided in the housing 1 .

[0078] like Fig.14 The figure shows the mechanism in the open state, the lever plate limit platform 913 of the lever plate 9 is in contact with the first V-shaped limit platform 12 in the shell 1, and the second driving surface 933 of the drive plate 93 is in contact with the first support shaft 92; the top operating wheel 2 is manually operated to close the switch, and the top operating wheel 2 rotates to drive the slider assembly 6 to slide to the left, and the slider assembly 6 drives the lever plate 9 to rotate counterclockwise, and the first support shaft 92 rotates around the rotation axis of the rotating shaft assembly 8. The first support shaft 92 abuts against the second driving surface 933 of the drive plate 93, driving the drive plate 93 to rotate counterclockwise together, and compresses the spring to store energy. When the mechanism passes the dead point, the spring releases energy and drives the first support shaft 92 and the drive plate 93 to close the switch quickly; the side operating wheel 3 is manually operated to close the switch, which directly drives the lever plate 9 to rotate counterclockwise, and the subsequent transmission steps are the same as above.

[0079] like Fig.15 The figure shows the mechanism in the closed state, the first limit surface 934 of the drive plate 93 abuts against the second V-shaped limit platform 13 of the shell 1, and the second drive surface 933 abuts against the first support shaft 92, so that the contacts can be reliably closed. The top operating wheel 2 is manually operated to open the gate, and the top operating wheel 2 rotates to drive the slider assembly 6 to slide to the right, and the slider assembly 6 drives the lever piece 9 to rotate clockwise. The first support shaft 92 rotates around the rotating axis of the shaft assembly 8 and compresses the spring to store energy. At this time, the first support shaft 92 and the drive plate 93 are not linked, that is, there is an empty stroke between the first support shaft 92 and the drive plate 93. Until the mechanism passes the dead point, the first support shaft 92 abuts against the first drive surface 932 of the drive plate 93, and the drive plate 93 drives the moving contact to quickly open the gate and increase the opening distance, as shown in FIG. Fig.16 The figure shows the mechanism opening to the dead point position. Since there is an idle stroke between the first drive surface 932 and the second drive surface 933, the action after passing the dead point has nothing to do with the rotation speed of the external force, but only with the spring force of the spring assembly 7, so that rapid closing regardless of the external force can be achieved. After the lever plate 9 opens, the lever plate limit platform 913 abuts against the first V-shaped limit platform 12 of the housing 1, and the lever plate 9 and the first support shaft 92 no longer rotate. At this time, the drive plate 93 will continue to rotate clockwise due to inertia until the second drive surface 933 abuts against the first support shaft 92.

[0080] The above description of the embodiments is to facilitate the understanding and use of the utility model by those skilled in the art. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the utility model is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the utility model without departing from the scope of the utility model should be within the scope of protection of the utility model.

Claims

1. An operating mechanism for controlling the closing and opening of switch contacts, characterized in that: It comprises a housing (1), a side operating wheel (3) and a coupling (4) arranged on the housing (1), a rotating shaft assembly (8) rotatably arranged in the housing (1) and used for transmission connection between the side operating wheel (3) and the coupling (4), and a spring assembly (7) arranged between the rotating shaft assembly (8) and the housing (1); One end of the spring assembly (7) is in contact with the rotating shaft assembly (8), and the other end is rotatably connected to the housing (1); The rotating shaft assembly (8) comprises a linkage shaft (94), a lever sheet (9), a first support shaft (92) eccentrically arranged on the lever sheet (9) relative to the linkage shaft (94), and a drive plate (93) coaxially arranged with the linkage shaft (94); the side operating wheel (3) and the lever sheet (9) rotate synchronously via the linkage shaft (94); the drive plate (93) is drivingly connected to the coupling member (4); The rotating shaft assembly (8) is elastically abutted against the spring assembly (7) via the first supporting shaft (92); The first support shaft (92) extends out of the lever sheet (9) to form a protruding end; The outer edge of the driving plate (93) is provided with an idle travel groove, and the extended end is rotatably arranged in the idle travel groove so that When the side operating wheel (3) drives the lever sheet (9) to rotate, the spring assembly (7) is compressed, and the extended end moves in the idle travel groove until it abuts against the side wall of the idle travel groove, so that the extended end can drive the coupling member (4) to rotate through the drive plate (93). After the extended end rotates until the direction of the elastic force of the spring assembly (7) passes over the linkage shaft (94), the elastic potential energy of the spring assembly (7) is released and the drive plate (93) is quickly pushed to drive the coupling member (4) to rotate.

2. The operating mechanism for controlling the closing and opening of switch contacts according to claim 1, characterized in that: The linkage shaft (94) comprises a shaft body with a polygonal cross section, a hole groove matching the shape of the shaft body is formed on one side of the side operating wheel (3), and a through hole matching the shape of the shaft body is formed on the lever sheet (9); The side operating wheel (3) and the lever sheet (9) rotate synchronously with the linkage shaft (94) through corresponding slots or through holes.

3. The operating mechanism for controlling the closing and opening of switch contacts according to claim 2, characterized in that: The linkage shaft (94) further comprises a circular shaft arranged at one end of the shaft body, and a circular hole matching the circular shaft is opened on one side of the coupling member (4), and the circular shaft and the circular hole rotate relative to each other.

4. The operating mechanism for controlling the closing and opening of switch contacts according to claim 3, characterized in that: A synchronous rotating platform is provided on one side of the coupling (4), and the synchronous rotating platform comprises an annular platform sleeved outside the circular hole, and a plurality of external bosses spaced apart on the outer edge of the annular platform; The driving plate (93) is provided with a synchronous rotation hole that matches the shape of the synchronous rotation platform; The driving plate (93) and the coupling member (4) achieve synchronous rotation with the synchronous rotation platform via the synchronous rotation hole.

5. The operating mechanism for controlling the closing and opening of switch contacts according to claim 1, characterized in that: The lever sheet (9) is provided with a hole (91) for the first support shaft (92) to pass through.

6. The operating mechanism for controlling the closing and opening of switch contacts according to claim 1, characterized in that: The lever sheet (9) is provided with a lever sheet limit platform; the housing is provided with a first V-shaped limit platform (12); The bottom side of the lever piece limit platform can successively abut against two sides of the first V-shaped limit platform (12) during the rotation process, thereby limiting the rotation within the housing (1).

7. The operating mechanism for controlling the closing and opening of switch contacts according to claim 1, characterized in that: A pair of limiting bosses are symmetrically arranged on the center of the driving plate (93); and a pair of second V-shaped limiting bosses (13) are arranged opposite to each other in the housing. The drive plate (93) can be pushed by the extended end to abut against the second V-shaped limit platform (13) during the rotation process to close the circuit breaker, at which time one end of the idle travel groove abuts against the extended end and the other end is located on the line connecting the rotating connection end of the spring assembly (7) and the linkage shaft (94).

8. The operating mechanism for controlling the closing and opening of switch contacts according to claim 1, characterized in that: The lever sheet (9) is provided with a gear transmission surface (914); The operating mechanism further comprises a top operating wheel (2) extending outside the housing (1), and a transmission assembly for transmission-connecting the top operating wheel (2) and the lever sheet (9); The transmission assembly comprises a slider (61) slidably disposed in a transverse direction in the housing (1), a rack (62) disposed at the bottom of the slider (61), and a toothed groove disposed on the slider (61); The top operating wheel (2) is rotatably mounted on the slider (61), and a gear (21) is provided at the bottom. The gear (21) meshes with the toothed groove, and the rack (62) meshes with the gear transmission surface (914), so that When the top operating wheel (2) is rotated, the slider (61) is driven to move laterally through the gear (21) and the toothed groove, and the lever sheet (9) is then driven to rotate through the rack (62) and the gear transmission surface (914).

9. The operating mechanism for controlling the closing and opening of switch contacts according to claim 1, characterized in that: The spring assembly (7) comprises a spring bracket (72), a spring (71), a support plate (73) and a second support shaft (74); One end of the spring bracket (72) is a U-shaped frame, and the other end is provided with a U-shaped slot; the U-shaped frame is in contact with the first support shaft (92); The support plate (73) is slidably mounted on the spring bracket (72); The two ends of the spring (71) are respectively in contact with the bottom of the U-shaped frame and the support plate (73); The second support shaft (74) is in contact with the bottom side of the support plate (73) and is slidably embedded in the U-shaped slot; The second support shaft (74) is fixedly arranged in the housing (1).

10. The operating mechanism for controlling the closing and opening of switch contacts according to claim 9, characterized in that: A bracket (5) is provided in the housing (1), and the second support shaft (74) is mounted on the bracket (5).

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