Linkage interlocking structure of composite apparatus

Abstract

The utility model relates to a linkage interlocking structure of a combined electric appliance, which comprises an isolating switch, a circuit breaker, a grounding switch and a linkage interlocking device, and is characterized in that the linkage interlocking device comprises a mounting bracket, an isolating switch control shaft, a circuit breaker control shaft and a grounding control shaft; the isolating switch comprises an isolating rotating shaft and a plurality of groups of isolating knives, an isolating knife crank arm sheet is arranged on an isolating switch control shaft, and an isolating linkage rod capable of movably rotating is arranged between one end of the isolating rotating shaft and the isolating knife crank arm sheet; the circuit breaker comprises a circuit breaker rotating shaft and a plurality of groups of vacuum circuit breakers, the end part of a circuit breaker control shaft is clamped on the circuit breaker rotating shaft, the circuit breaker control shaft is synchronously connected with a circuit breaker input shaft, the grounding switch comprises a grounding rotating shaft and a plurality of groups of grounding switches, and a grounding switch crank arm sheet is arranged on the grounding control shaft. And a grounding linkage rod capable of moving and rotating is arranged between the end part of the grounding rotating shaft and the grounding knife crank arm sheet, so that the problem that safety accidents are easily caused due to the fact that a traditional isolating switch, a traditional circuit breaker and a traditional grounding switch are operated independently is solved.

Description

Technical Field

[0001] The present application relates to the field of switch cabinets, and in particular to a linkage interlocking structure of a combination electrical appliance. Background Art

[0002] To ensure the reliable operation of metal-enclosed switchgear and the personal safety of operators in high-voltage electrical equipment, the bypass center cabinet within the high-voltage cabinet primarily comprises operating components such as vacuum circuit breakers, disconnectors, and earthing switches, as well as measuring and protection components such as transformers, forming the power supply circuit. To prevent short circuits, electric shock, and equipment damage caused by misoperation, national regulations require the implementation of "five-prevention" interlocking requirements. Specifically, the bypass center cabinet must have five comprehensive misoperation prevention features: 1. Prevention of accidental opening and closing of the circuit breaker; 2. Prevention of accidental opening and closing of the disconnector while under load; 3. Prevention of accidental entry into live compartments; 4. Prevention of closing the earthing switch while energized; and 5. Prevention of closing the earthing switch while energized.

[0003] In existing circuit breakers, when power is cut off or repaired, the grounding switch is closed first, then the circuit breaker is opened, and then the isolating switch is opened. Or when power is turned on, the grounding switch is opened first, then the isolating switch is closed, and then the circuit breaker is closed. However, if the operator does not operate according to the standard sequence, when the isolating switch or the grounding switch is closed, another switch is operated to close, or a switch is operated to close but the shaft has not rotated successfully, and the next opening and closing operation is performed, the box will be energized, which will cause a great risk of electric shock due to leakage, resulting in a safety accident.

[0004] In view of this, the utility model provides a combined electrical switch cabinet with linkage and interlocking, which can solve the safety problem in the opening and closing process. Utility Model Content

[0005] Based on this, it is necessary to propose a linkage interlocking structure for combined electrical appliances to address the safety issues of traditional switch cabinets.

[0006] The present application provides a linkage interlocking structure of a combination electrical appliance, comprising an isolating switch, a circuit breaker, a grounding switch, and a linkage interlocking device, wherein the linkage interlocking device comprises a mounting bracket, an isolating switch control shaft, a circuit breaker control shaft, and a grounding control shaft;

[0007] The isolating switch comprises an isolating rotating shaft and a plurality of isolating knives, an isolating knife crank arm piece is provided on the isolating switch control shaft, and an isolating linkage rod that can be movably rotated is provided between one end of the isolating rotating shaft and the isolating knife crank arm piece;

[0008] The circuit breaker includes a circuit breaker rotating shaft and multiple groups of vacuum circuit breakers, the end of the circuit breaker control shaft is clamped on the circuit breaker rotating shaft, the circuit breaker control shaft is synchronously connected to the circuit breaker input shaft, and the circuit breaker input shaft is connected to the circuit breaker knob;

[0009] The grounding switch includes a grounding shaft and multiple sets of grounding knives, a grounding knife crank arm piece is provided on the grounding control shaft, and a rotatable grounding linkage rod is provided between the end of the grounding shaft and the grounding knife crank arm piece;

[0010] The isolating switch control shaft rotates to control the opening and closing of the isolating switch, the circuit breaker control shaft rotates to control the opening and closing of the circuit breaker, and the grounding control shaft rotates to control the opening and closing of the grounding switch.

[0011] Preferably, the mounting bracket includes an operating panel, a support plate and a connecting plate, and a first interlocking device is provided between the isolating switch control shaft and the grounding control shaft, and the first interlocking device is used to limit the rotation of the grounding control shaft.

[0012] Preferably, the first interlocking device includes a movable rod and a first return spring, the movable rod is slidably arranged on the connecting plate, the upper end of the movable rod is against the bottom of the isolation knife arm piece, the lower end of the first return spring is fixed on the movable rod, and the upper end of the first return spring is fixed on the connecting plate.

[0013] Preferably, a plurality of grounding limit grooves are provided on the grounding knife crook arm piece, and the movable rod is clamped in one of the grounding limit grooves under the squeezing of the isolation knife crook arm piece.

[0014] Preferably, a second interlocking device is connected to the grounding control shaft, and the second interlocking device is used to limit the rotation of the circuit breaker control shaft.

[0015] Preferably, the second interlocking device includes a movable plate, which is slidably arranged on the support plate. A coaxially rotating circuit breaker bend piece is provided on the grounding control shaft, and the rotation of the circuit breaker bend piece drives the movable plate to slide up and down.

[0016] Preferably, a circuit breaker limit block is provided at the end of the circuit breaker input shaft, and a limit baffle is provided at the upper end of the movable plate. When the grounding control shaft controls the grounding switch to close, the limit baffle abuts against the circuit breaker limit block, preventing the circuit breaker control shaft from rotating.

[0017] Preferably, a third interlocking device is provided between the circuit breaker and the isolating switch, and the third interlocking device is used to limit the opening and closing of the isolating switch.

[0018] Preferably, the third interlocking device includes an isolation locking bend piece, an isolation locking movable rod and an isolation locking plate, the isolation locking movable rod is slidably arranged on the third interlocking device, and the isolation locking bend piece and the circuit breaker shaft are coaxially rotatably arranged.

[0019] Preferably, the isolation lock plate is arranged on the isolation shaft, and a plurality of isolation limit grooves are provided on the isolation lock plate. The isolation locking bend plate rotates to push the isolation locking movable rod upward, and the upper end of the isolation locking movable rod is clamped in the isolation limit groove, so that the isolation shaft cannot be rotated to close the switch.

[0020] Technical advantages of this application:

[0021] 1. By setting the first interlocking device, when the disconnector is closed, the movable rod is connected to the grounding limit slot, making it impossible to manually rotate the grounding control shaft and the grounding switch cannot be opened or closed. This can prevent the equipment from being grounded with power on and causing electric shock accidents.

[0022] 2. By setting a second interlocking device, when the grounding switch is closed and in the maintenance state, the limit baffle of the movable plate will jam the circuit breaker limit block of the circuit breaker input shaft, and the circuit breaker cannot be manually rotated to open or close, preventing sudden power supply and high-voltage electric shock accidents;

[0023] 3. By setting up the third interlocking device, when the circuit breaker is closed, the isolation locking movable rod is clamped in the isolation limit slot, so that the isolation switch cannot be rotated to open or close, preventing live operation and causing safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of this application are used to provide a further understanding of this application and make other features, purposes and advantages of this application more apparent. The drawings and descriptions of the exemplary embodiments of this application are used to explain this application and do not constitute an improper limitation on this application.

[0025] Figure 1 This is a schematic internal perspective view of the switch cabinet of this application.

[0026] Figure 2 This is a front structural schematic diagram of the linkage interlocking device of this application.

[0027] Figure 3 For this application Figure 1 A magnified view of the structure of part A.

[0028] Figure 4 For this application Figure 1 A magnified view of the structure of part B.

[0029] Figure 5 For this application Figure 1 A magnified view of the structure of part C in FIG.

[0030] Figure 6 This is a schematic diagram of the overall structure of the linkage interlocking device of this application.

[0031] Figure 7 For this application Figure 6 A magnified view of the structure of part D in FIG.

[0032] Reference numerals: disconnector 11; disconnect shaft 111; disconnect knife 112; circuit breaker 12; circuit breaker shaft 121; vacuum circuit breaker 122; grounding switch 13; grounding shaft 131; grounding knife 132; linkage interlocking device 2; mounting bracket 20; operation panel 201; support plate 202; connecting plate 203; disconnector control shaft 21; disconnect knife arm 211; disconnect linkage rod 212; circuit breaker control shaft 22; circuit breaker knob 220; circuit breaker input shaft 2 21; circuit breaker limit block 2211; grounding control shaft 23; grounding knife elbow arm 231; grounding limit slot 2310; grounding linkage rod 232; circuit breaker elbow 233; first interlocking device 3; movable rod 31; limit buckle 311; first return spring 32; second interlocking device 4; movable plate 41; limit baffle 411; third interlocking device 5; isolation locking elbow 51; isolation locking movable rod 52; isolation lock plate 53; isolation limit slot 530; second return spring 54. DETAILED DESCRIPTION

[0033] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in combination with the accompanying drawings by way of examples.

[0034] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0035] In this utility model, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integration; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or an interaction between two components. However, the phrase "direct connection" indicates that the two connected entities are not connected through an intermediate structure, but are connected to form a whole through a connecting structure. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0036] like Figures 1 to 7 As shown, the present application provides a combination electrical switch cabinet with interlocking, which is used to solve the problem that traditional isolating switches, circuit breakers and grounding switches operate independently of each other and are prone to safety accidents. In order to achieve a stable safety interlock structure for the equipment, when one of the switches is closed, the other switches cannot be opened or closed.

[0037] like Figure 1-Figure 2 As shown, in one embodiment of the present application

[0038] The present application provides a combination electrical switch cabinet with linkage and interlocking, comprising an isolating switch 11, a circuit breaker 12 and a grounding switch 13 arranged in sequence from top to bottom, and a linkage and interlocking device 2 arranged on one side.

[0039] like Figure 3-Figure 5 As shown: the linkage interlocking device 2 of the present invention includes a mounting bracket 20, an isolating switch control shaft 21, a circuit breaker control shaft 22 and a grounding control shaft 23. The isolating switch control shaft 21 rotates to control the opening and closing of the isolating switch 11, the circuit breaker control shaft 22 rotates to control the opening and closing of the circuit breaker 12, and the grounding control shaft 23 rotates to control the opening and closing of the grounding switch 13.

[0040] like Figure 3 and Figure 6 As shown, in order to prevent the grounding switch 13 from opening and closing when the disconnector 11 is closed, a first interlocking device 3 is provided between the disconnector control shaft 21 and the grounding control shaft 23. The first interlocking device 3 is used to limit the rotation of the grounding control shaft 23. The grounding control shaft 23 is connected to a second interlocking device 4. The second interlocking device 4 is used to limit the rotation of the circuit breaker control shaft 22. A third interlocking device 5 is provided between the circuit breaker 12 and the disconnector 11. The third interlocking device 5 is used to limit the opening and closing of the disconnector 11.

[0041] like Figure 3 and Figure 6 As shown, the mounting bracket 20 includes an operation panel 201, a support plate 202 and a connecting plate 203. The operation panel 201 mainly faces the operator. The operation panel 201 is provided with an isolating switch port, a circuit breaker knob 220 and an earthing switch port. The isolating switch port, the circuit breaker knob 220 and the earthing switch port are all displayed with prompts of the rotation direction of opening and closing, indicating which direction of rotation will result in closing or opening.

[0042] like Figure 2 As shown, the circuit breaker knob 220 can perform circuit breaker opening and closing operations. The isolating switch control shaft 21 can be rotated from the isolating switch port to control the opening and closing of the isolating switch 11. The grounding control shaft 23 can be rotated from the grounding switch port to control the opening and closing of the grounding switch 23.

[0043] There are two support plates 202, which are mainly used to support the main components inside. The connecting plate 230 is mainly fixedly connected to the cabinet 1 near the circuit breaker.

[0044] All the disconnector control shafts 21 , circuit breaker control shafts 22 and grounding control shafts 23 pass through and are rotatably connected to the support plate 202 and the connecting plate 203 in sequence.

[0045] like Figure 1 and Figure 3 As shown, the isolating switch 11 includes an isolating shaft 111 and three sets of isolating switches 112. The isolating shaft 111 rotates to control the connection or disconnection of the three sets of isolating switches 112 and the busbars. An isolating switch control shaft 21 is provided with an isolating switch arm 211. A rotatable isolating linkage rod 212 is provided between one end of the isolating shaft 111 and the isolating switch arm 211.

[0046] like Figure 1 、 Figure 3 、 Figure 4 As shown, the circuit breaker 12 includes a circuit breaker shaft 121 and three groups of vacuum circuit breakers 122. The end of the circuit breaker control shaft 22 is clamped on the circuit breaker shaft 121. The circuit breaker control shaft 22 is synchronously connected to the circuit breaker input shaft 221. The circuit breaker input shaft 221 is connected to the circuit breaker knob 220.

[0047] The overall control process is that the circuit breaker knob 220 is used to input the opening and closing operation, and then the circuit breaker input shaft 221 and the internal mechanism are transformed to make the circuit breaker control shaft 22 rotate to control the circuit breaker shaft 121.

[0048] The circuit breaker input shaft 221 and the circuit breaker control shaft 22 are in a progressive transmission relationship. When the circuit breaker input shaft 221 cannot rotate, the circuit breaker control shaft 22 cannot rotate to control the circuit breaker rotating shaft 121.

[0049] like Figure 5 As shown, the grounding switch 13 includes a grounding shaft 131 and multiple sets of grounding knives 132. A grounding knife arm piece 231 is provided on the grounding control shaft 23, and a rotatable grounding linkage rod 232 is provided between the end of the grounding shaft 131 and the grounding knife arm piece 231.

[0050] In order to prevent the grounding switch 13 from closing and grounding when the isolating switch 11 is closed, that is, when the circuit is connected, it is necessary to limit the closing of the grounding switch 13, so the first interlocking device 3 is provided.

[0051] like Figure 3 、 Figure 6 、 Figure 7 As shown, the first interlocking device 3 includes a movable rod 31 and a first return spring 32. The movable rod 31 is slidably set on the connecting plate 203. In the utility model, a plurality of limit buckles 311 are mainly buckled on the movable rod 31 so that the movable rod 31 can only move up and down.

[0052] The upper end of the movable rod 31 rests against the bottom of the isolation knife crook arm piece 211, the lower end of the first return spring 32 is fixed on the movable rod 31, the upper end of the first return spring 32 is fixed on the connecting plate 203, and a plurality of grounding limit grooves 2310 are provided on the grounding knife crook arm piece 231. The movable rod 31 is clamped in one of the grounding limit grooves 2310 under the squeezing of the isolation knife crook arm piece 211.

[0053] like Figure 7 As shown, the movable rod 31 is pulled by the first return spring 32 to provide an upward pulling force, so that the movable rod 31 is in a separated state from the grounding limit groove 2310 under normal conditions, that is, only when the isolating switch 11 is closed, the movable rod 31 will be stuck in the grounding limit groove 2310 to prevent the grounding switch 13 from closing.

[0054] Specifically, such as 2 and Figure 6 As shown, when the isolation knife arm 211 rotates clockwise, the isolation linkage rod 212 is pulled up to make the isolation knife 112 rotate to open the switch, and rotate counterclockwise to close the switch. Figure 2 When the isolating knife arm 211 rotates clockwise to open the switch, the first reset spring 32 pulls the movable rod 31 to move upward, and the movable rod 31 is not stuck in the grounding limit groove 2310, and there is no restriction on the grounding switch.

[0055] When the isolating knife arm 211 rotates counterclockwise, the isolating linkage rod 212 is pulled downward, causing the isolating knife 112 to rotate and close. At this time, the isolating knife arm 211 squeezes the movable rod 31 to slide downward, and causes the movable rod 31 to be engaged in the grounding limit slot 2310, so that the grounding control shaft 23 cannot rotate. That is, when the isolating switch 11 is closed, the grounding switch 13 cannot rotate for opening and closing operations, mainly to prevent the grounding switch 13 from closing, to avoid grounding the equipment when it is energized, which may cause electric shock accidents.

[0056] In order to prevent sudden power supply when the grounding switch 13 is closed, that is, during maintenance, it is necessary to prohibit the circuit breaker closing operation, so a second interlocking device 4 is provided, such as Figure 6 As shown, the second interlocking device 4 includes a movable plate 41, which is slidably arranged on the support plate 202. The movable plate 41 is provided with multiple sliding grooves and is fixed to the support plate 202 by bolts. The movable plate 41 slides up and down along the support plate 202.

[0057] A coaxially rotating circuit breaker bend piece 233 is provided on the grounding control shaft 23, and the bottom of the movable plate 41 is abutted against the circuit breaker bend piece 233. The rotation of the circuit breaker bend piece 233 pushes the movable plate 41 to slide up and down. A circuit breaker limit block 2211 is provided at the end of the circuit breaker input shaft 221, and a limit baffle 411 is provided at the upper end of the movable plate 41. When the grounding control shaft 23 controls the grounding switch 13 to close, the limit baffle 411 abuts against the circuit breaker limit block 2211, preventing the circuit breaker control shaft 22 from rotating.

[0058] Specific principles, such as Figure 2 and Figure 6 As shown, when the grounding control shaft 23 rotates clockwise, the grounding switch is in the open state, the equipment is not grounded, the movable plate 41 rests on the low point of the circuit breaker bend 233, and the limit baffle 411 and the circuit breaker limit block 2211 are not in contact;

[0059] When the grounding control shaft 23 rotates counterclockwise, the circuit breaker bend piece 233 rotates and pushes the movable plate 41 upward, so that the limit baffle 411 blocks the rotation path of the circuit breaker limit block 2211, thereby preventing the circuit breaker input shaft 221 from rotating, and thus the circuit breaker control shaft 22 cannot rotate to control the circuit breaker shaft 121.

[0060] The purpose of providing the second interlocking device 4 is that when the grounding switch 13 is closed and in the maintenance state, the limit baffle 411 of the movable plate 41 clamps the circuit breaker limit block 2211 of the circuit breaker input shaft, thereby limiting the rotation of the circuit breaker input shaft 221, so that the circuit breaker control shaft 22 rotates to control the circuit breaker shaft 121. The circuit breaker 12 cannot be manually rotated to open or close, thereby preventing sudden power supply and high-voltage electric shock accidents, thereby playing a safety protection role.

[0061] After the circuit breaker 12 is closed, in order to prevent the disconnector 11 from opening and closing operations, the disconnector 11 is in a live state and other switches are prohibited from opening and closing operations. Therefore, a third interlocking device 5 is provided.

[0062] Specifically, such as Figure 1 、 Figure 4 、 Figure 6 As shown, the third interlocking device 5 includes an isolation locking bend piece 51, an isolation locking movable rod 52 and an isolation lock plate 53. The isolation locking movable rod 52 is slidably set on the cabinet 1, and the isolation locking bend piece 51 and the circuit breaker shaft 121 are coaxially rotated. The isolation lock plate 53 is set on the isolation shaft 111, and a plurality of isolation limit grooves 530 are set on the isolation lock plate 53. The isolation locking movable rod 52 is also provided with a second reset spring 54. The second reset spring 54 provides a downward pulling force. Under normal conditions, the second reset spring 54 pulls the isolation locking movable rod 52 away from the isolation limit groove 530.

[0063] However, when the circuit breaker 12 is closed, that is, when the circuit breaker shaft 121 rotates, the high point of the isolation locking bend 51 pushes the isolation locking movable rod 52 to move upward, and the upper end of the isolation locking movable rod 52 is engaged in the isolation limit groove 530, so that the isolation shaft 111 cannot rotate to open or close the circuit breaker. In this way, the operation of the isolation switch 11 can be restricted to prevent live operation when the circuit of the entire equipment is connected, thereby preventing accidents.

[0064] In the present invention, by setting a first interlocking device, when the isolating switch is closed and connected, the movable rod is clamped on the grounding limit groove, so that the grounding control shaft cannot be rotated manually, and the grounding switch cannot be opened or closed, thus preventing the equipment from being grounded with power on and causing electric shock accidents; by setting a second interlocking device, when the grounding switch is closed, it is in a maintenance state, and the limit baffle of the movable plate clamps the circuit breaker limit block of the circuit breaker input shaft, so that the circuit breaker cannot be rotated to open or close manually, thus preventing sudden power supply and high-voltage electric shock accidents; by setting a third interlocking device, when the circuit breaker is closed, the isolation locking movable rod is clamped in the isolation limit groove, so that the isolating switch cannot be rotated to open or close, thus preventing live operation and safety accidents.

[0065] The various technical features of the above-described embodiments can be combined arbitrarily, and the execution order of the method steps is not restricted. In order to make the description concise, not all possible combinations of the various technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A linkage interlocking structure of a combination electrical appliance, characterized in that: It comprises an isolating switch (11), a circuit breaker (12), a grounding switch (13) and a linkage interlocking device (2), wherein the linkage interlocking device (2) comprises a mounting bracket (20), an isolating switch control shaft (21), a circuit breaker control shaft (22) and a grounding control shaft (23); The isolating switch (11) comprises an isolating rotating shaft (111) and a plurality of isolating knife groups (112); an isolating knife crank arm piece (211) is provided on the isolating switch control shaft (21); and a rotatable isolating linkage rod (212) is provided between one end of the isolating rotating shaft (111) and the isolating knife crank arm piece (211); The circuit breaker (12) comprises a circuit breaker rotating shaft (121) and a plurality of vacuum circuit breakers (122); an end portion of the circuit breaker control shaft (22) is clamped onto the circuit breaker rotating shaft (121); the circuit breaker control shaft (22) is synchronously connected to a circuit breaker input shaft (221); and the circuit breaker input shaft (221) is connected to a circuit breaker knob (220); The grounding switch (13) comprises a grounding rotating shaft (131) and a plurality of grounding knife groups (132); a grounding knife arm piece (231) is provided on the grounding control shaft (23); and a rotatable grounding linkage rod (232) is provided between the end of the grounding rotating shaft (131) and the grounding knife arm piece (231); The isolating switch control shaft (21) rotates to control the opening and closing of the isolating switch (11), the circuit breaker control shaft (22) rotates to control the opening and closing of the circuit breaker (12), and the grounding control shaft (23) rotates to control the opening and closing of the grounding switch (13).

2. The linkage interlocking structure of a combination electrical appliance according to claim 1, characterized in that: The mounting bracket (20) comprises an operating panel (201), a support plate (202) and a connecting plate (203); a first interlocking device (3) is provided between the disconnector control shaft (21) and the grounding control shaft (23); the first interlocking device (3) is used to limit the rotation of the grounding control shaft (23).

3. The linkage interlocking structure of a combination electrical appliance according to claim 2, characterized in that: The first interlocking device (3) includes a movable rod (31) and a first return spring (32), wherein the movable rod (31) is slidably arranged on the connecting plate (203), the upper end of the movable rod (31) abuts against the bottom of the isolation knife arm (211), the lower end of the first return spring (32) is fixed on the movable rod (31), and the upper end of the first return spring (32) is fixed on the connecting plate (203).

4. The linkage interlocking structure of a combination electrical appliance according to claim 3, characterized in that: A plurality of grounding limit slots (2310) are provided on the grounding knife crook arm piece (231), and the movable rod (31) is clamped into one of the grounding limit slots (2310) under the squeezing of the isolation knife crook arm piece (211).

5. The linkage interlocking structure of a combination electrical appliance according to claim 2, characterized in that: A second interlocking device (4) is connected to the grounding control shaft (23), and the second interlocking device (4) is used to limit the rotation of the circuit breaker control shaft (22).

6. The linkage interlocking structure of a combination electrical appliance according to claim 5, characterized in that: The second interlocking device (4) comprises a movable plate (41), the movable plate (41) being slidably arranged on the support plate (202), and a coaxially rotating circuit breaker bend piece (233) being arranged on the grounding control shaft (23), and the rotation of the circuit breaker bend piece (233) drives the movable plate (41) to slide up and down.

7. The linkage interlocking structure of a combination electrical appliance according to claim 6, characterized in that: A circuit breaker limit block (2211) is provided at the end of the circuit breaker input shaft (221), and a limit baffle (411) is provided at the upper end of the movable plate (41). When the grounding control shaft (23) controls the grounding switch (13) to close, the limit baffle (411) abuts against the circuit breaker limit block (2211), preventing the circuit breaker control shaft (22) from rotating.

8. The linkage interlocking structure of a combination electrical appliance according to claim 2, characterized in that: A third interlocking device (5) is provided between the circuit breaker (12) and the isolating switch (11), and the third interlocking device (5) is used to limit the opening and closing of the isolating switch (11).

9. The linkage interlocking structure of a combination electrical appliance according to claim 8, characterized in that: The third interlocking device (5) comprises an isolation locking bend piece (51), an isolation locking movable rod (52) and an isolation locking plate (53); the isolation locking movable rod (52) is slidably arranged on the third interlocking device (5); and the isolation locking bend piece (51) and the circuit breaker rotating shaft (121) are coaxially rotatably arranged.

10. The linkage interlocking structure of a combination electrical appliance according to claim 9, characterized in that: The isolation lock plate (53) is arranged on the isolation rotating shaft (111), and a plurality of isolation limiting grooves (530) are provided on the isolation lock plate (53). The isolation locking bend piece (51) rotates to push the isolation locking movable rod (52) to move upward, and the upper end of the isolation locking movable rod (52) is clamped in the isolation limiting groove (530), so that the isolation rotating shaft (111) cannot be rotated to close the switch.

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