CN213093166U - Safe insulating operating system and switching device - Google Patents

Abstract

The utility model provides a safe insulating operating system, including the manual piece that receives the outside handle driven to and the gear drive who links to each other with manual piece, wherein, at least one part in manual piece and the gear drive is the insulating part. Through setting up the insulating part, so not only improved fail safe nature, and reduced product EMC electrostatic discharge risk, prolonged the life of product.

Description

Safe insulating operating system and switching device

Technical Field

The utility model relates to an electrical control equipment technical field, concretely relates to safe insulating operating system and switching device.

Background

The plastic shell type circuit breaker is often used as a terminal switch or a branch switch in a low-voltage power distribution system, and plays a role in protecting a power supply circuit and mechanical equipment in real time.

The existing intelligent molded case circuit breaker is generally provided with a manual and electric reclosing mechanism, which mainly comprises a manual shaft, a gear transmission mechanism, a connecting rod and a motor. During manual operation, an operator rotates the manual shaft through the hexagonal handle, and the manual shaft drives the operating handle of the circuit breaker to perform closing action through the gear transmission mechanism and the connecting rod. Because the transmission mechanisms such as the manual shaft, the gear transmission mechanism, the connecting rod and the like are all made of iron materials, in a small shell frame product with a compact structure, the transmission mechanism part is close to the circuit board module, so that the electric clearance between the transmission mechanism part and the circuit board module is smaller, and the hexagonal handle is also made of iron materials, so that once the transmission mechanism is electrified, an operator is caused to get an electric shock, and the safety performance is low; on the other hand, there is also the risk of product EMC electrostatic discharge, also is human static to get into the circuit breaker inside through drive mechanism, probably leads to circuit board module to damage.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the defect that the intelligent moulded case circuit breaker among the prior art has the security performance low and EMC electrostatic discharge risk to provide a security performance height, avoid the safe insulating operating system of EMC electrostatic discharge risk, and have this safe insulating operating system's switching device.

Therefore, the utility model provides a safe insulating operating system, including the manual piece that receives the outside handle drive, and with the gear drive who links to each other of manual piece, wherein, manual piece with at least one part in the gear drive is the insulating part.

The manual piece comprises an insulating part which is arranged at the upper end and can be driven by the external handle to rotate, and a metal shaft which is arranged at the lower end and can drive the gear transmission mechanism to act.

The gear transmission mechanism comprises a driven gear, a manual gear and an electric gear, the driven gear is connected with an operating handle through a connecting rod assembly, and the operating handle is used for driving the switching device to switch on and off; manual gear and electronic gear, locate separately driven gear's both sides, and all with driven gear meshing connects, manual gear receives manual member drive rotates, electronic gear receives motor drive and rotates.

The driven gear is an insulating part, and the manual gear, the electric gear and the connecting rod component are all metal parts.

And a first clutch mechanism for preventing the motor from reversely rotating is arranged between the manual piece and the manual gear.

The first clutch mechanism comprises a connecting shaft, a first ratchet and a first elastic piece. The connecting shaft is vertically arranged on the metal shaft; the first ratchets are arranged on the inner wall of the manual gear at intervals along the circumferential direction, one side of each first ratchet is a first vertical surface capable of abutting against the connecting shaft, and the other side of each first ratchet is a first inclined surface capable of being in sliding fit with the connecting shaft; one end of the first elastic piece is abutted against the manual gear, and the other end of the first elastic piece is abutted against a middle cover bottom plate of the shell.

And a plurality of functional holes for the connecting shaft to penetrate are formed in the metal shaft at intervals along the height direction of the metal shaft.

The top shaping of metal axle has T shape connecting block, the insulating part with the connecting block is through moulding plastics integrated into one piece.

The hand piece is connected with a mounting plate fixed on a mounting column of the middle cover through a mounting structure, the mounting structure comprises a first perforation, an annular groove and a retainer ring, the first perforation is arranged on the mounting plate, and the aperture of the first perforation is smaller than the outer diameter of the insulating part and larger than the outer diameter of the metal shaft; the annular groove is arranged on one side, close to the insulating part, of the metal shaft; and the check ring is arranged in the annular groove, the outer diameter of the check ring is larger than the aperture of the first through hole, and during assembly, the top surface and the bottom surface of the mounting plate are respectively abutted against the insulating part and the check ring.

The utility model also provides a switching device, include as above safe insulating operating system, wherein, switching device is moulded case circuit breaker or dual power change over switch.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a safe insulating operating system, including the manual piece that receives the outside handle driven to and the gear drive who links to each other with manual piece, wherein, at least one part in manual piece and the gear drive is the insulating part. Therefore, the safety and reliability are improved, the EMC electrostatic discharge risk of the product is reduced, and the service life of the product is prolonged.

2. The utility model provides a safe insulating operating system, manual piece can receive outside handle drive pivoted insulating part including locating the upper end to and locate the metal axle that can drive the gear drive mechanism action of lower extreme. The insulating part can realize the electrical isolation between the circuit board assembly inside the switch device and the outside, ensure the EMC characteristics of the product, prevent operators from electric shock and ensure the personal safety; and the metal shaft can ensure the use strength.

3. The utility model provides an insulating operating system of safety, driven gear are the insulating part, and manual gear, electronic gear and link assembly are the metalwork. To little housing rack switching device, because driving gear mechanism bears the effort less relatively, requires to reduce to part intensity, consequently, the utility model discloses the people only changes driven gear into the higher plastics insulating part of intensity by the metalwork, can satisfy the intensity requirement like this, can realize switching device internal circuit board subassembly and outside electrical isolation again, guarantees product EMC characteristic, also can prevent that operating personnel from electrocuteeing, ensures personal safety.

4. The utility model provides a safe insulating operating system, first clutching mechanism includes: the connecting shaft is vertically arranged on the metal shaft; the first ratchets are arranged on the inner wall of the manual gear at intervals along the circumferential direction, one side of each first ratchet is a first vertical surface capable of abutting against the connecting shaft, and the other side of each first ratchet is a first inclined surface capable of being in sliding fit with the connecting shaft; one end of the first elastic piece is abutted against the manual gear, and the other end of the first elastic piece is abutted against a middle cover bottom plate of the shell. When the manual piece rotates clockwise, the connecting shaft abuts against the first vertical surface of the first ratchet, so that the manual gear is driven to rotate; when the hand piece anticlockwise rotates, the connecting shaft is in sliding fit with the first inclined plane of the first ratchet, the hand gear cannot be driven to rotate, and therefore the situation that the motor rotates reversely is avoided.

5. The utility model provides a safe insulating operating system, metal axle are equipped with a plurality of functional holes that can supply the connecting axle to wear to establish along its direction of height interval. During assembly, the connecting shaft penetrates into the functional hole, so that force transmission between the metal shaft and the connecting shaft is realized; in addition, through setting up a plurality of functional holes, can satisfy the installation requirement of not co-altitude manual gear, also the same hand piece can satisfy the operation requirement of different specification products, has increased the commonality of part.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a perspective view of a switching device of the present invention;

FIG. 2 is a perspective view of FIG. 1 with the upper cover removed;

FIG. 3 is an assembly schematic of the hand piece, gear drive, and linkage assembly;

FIG. 4 is an exploded view of the hand piece, hand gear and first resilient member;

FIG. 5 is a perspective view of a manual gear;

FIG. 6 is a schematic view of the assembly of the hand piece with the mounting plate;

FIG. 7 is a schematic view of the assembly of the motor, the motorized gear and the ratchet;

FIG. 8 is a top view of FIG. 7;

FIG. 9 is an exploded view of FIG. 7;

FIG. 10 is an assembly schematic of the electric gear and torsion spring;

FIG. 11 is a perspective view of a first wire routing embodiment of the protection mechanism;

FIG. 12 is an enlarged view of portion A of FIG. 11;

FIG. 13 is a partial cross-sectional view of FIG. 1;

FIG. 14 is an exploded view of the circuit board, toggle switch and indicator;

FIG. 15 is an exploded view of the circuit board, toggle switch and indicator from another angle;

FIG. 16 is a perspective view of the middle cap;

FIG. 17 is a perspective view of a second wire routing embodiment of the protection mechanism;

FIG. 18 is an enlarged view of portion B of FIG. 17;

FIG. 19 is a perspective view of a third wire routing embodiment of the protection mechanism;

fig. 20 is an enlarged schematic view of a portion C in fig. 19.

Description of reference numerals: 1. a hand piece; 11. an insulating section; 12. a metal shaft; 120. a functional hole; 121. an annular groove; 13. a connecting shaft; 14. connecting blocks; 15. a retainer ring; 2. a manual gear; 21. a first ratchet; 211. a first vertical surface; 212. a first inclined plane; 22. a first elastic member; 3. a driven gear; 31. a connecting rod assembly; 32. an operating handle; 4. an electric gear; 40. a motor; 41. a rotating shaft; 42. a ratchet wheel; 43. a second ratchet; 431. a second vertical surface; 432. a second sliding surface; 44. a torsion spring; 441. a horizontal segment; 442. a vertical section; 45. riveting; 46. a fixed block; 461. a first slot; 47. a chute; 471. a side wall; 5. a housing; 51. an upper cover; 510. a groove; 511. an operation hole; 512. a strip hole; 513. a boss; 52. a middle cover; 521. a middle cover bottom plate; 522. a middle cover side plate; 523. mounting a column; 524. a card slot; 525. a back-off part; 526. a gate-shaped through hole; 527. a wire guide groove; 528. a second hook portion; 53. mounting a plate; 531. a first perforation; 532. a first hook portion; 6. an indicator; 60. a second slot; 61. an indicating section; 62. a baffle portion; 621. a second perforation; 63. a second poker rod; 64. an indicator mark; 7. a toggle switch; 71. a first poke rod; 8. a circuit board; 81. and (4) conducting wires.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Examples

The present embodiment provides a switch device, as shown in fig. 1-4, comprising a housing 5, a hand piece 1, a gear transmission mechanism and a protection mechanism.

The housing 5 includes an upper cover 51 and a middle cover 52.

The upper cover 51 is formed with a groove 510 and an operation hole 511 for inserting an external handle, as shown in fig. 1, the middle of the bottom wall of the groove 510 is provided with a long hole 512 for extending the second tap lever 63 and limiting the moving track thereof, as shown in fig. 13, the bottom surface of the upper cover 51 is formed with a boss 513 capable of abutting against the top surface of the circuit board 8.

The middle cover 52, as shown in fig. 16, includes a middle cover bottom plate 521 and a middle cover side plate 522, and the middle cover bottom plate 521 and the middle cover side plate 522 enclose a mounting cavity suitable for mounting the hand piece 1, the gear transmission mechanism and the protection mechanism. The middle cover bottom plate 521 is provided with a mounting column 523 and a mounting plate 53 which is arranged on the top of the mounting column 523 and is suitable for mounting the hand piece 1, the mounting plate 53 is provided with a first through hole 531, and the diameter of the first through hole 531 is smaller than the outer diameter of the insulating part 11 of the hand piece 1 and larger than the outer diameter of the metal shaft 12. As shown in fig. 11 and 12, the middle cover 52 is further provided with a card slot 524 for the circuit board 8 to be vertically inserted, near the middle cover side plate 522 on the left side. The middle cover bottom plate 521 is provided with an inverted buckling portion 525 extending towards the middle cover side plate 522 and adapted to position the wires 81, and the wires 81 on the circuit board 8 located at the lower left of the housing 5 are routed along the inner wall of the middle cover side plate 522 so as to be connected to the control unit located at the upper right of the housing 5.

The hand piece 1, as shown in fig. 3 and 4, includes an insulating part 11 disposed at the upper end and driven by the external handle to rotate, and a metal shaft 12 disposed at the lower end and capable of driving the gear transmission mechanism to act, the metal shaft 12 is provided with two functional holes 120 at intervals along the height direction thereof, through which the connecting shaft 13 can pass, and one side of the metal shaft 12 close to the insulating part 11 is provided with an annular groove 121 in which a retainer ring 15 can be installed, a T-shaped connecting block 14 is formed at the top of the metal shaft 12, and the insulating part 11 and the connecting block 14 are integrally formed by injection molding. During production, the metal shaft is processed independently, then the metal shaft is fixed on an injection molding machine as an insert, and the plastic material is directly pressed on the metal shaft, so that the plastic shaft is integrally processed and molded through injection molding. As shown in fig. 6, when the hand piece 1 is assembled with the mounting plate 53, the metal shaft 12 is inserted through the first through hole 531 of the mounting plate 53, so that the insulating part 11 of the hand piece 1 abuts against the top surface of the mounting plate 53, the retaining ring 15 is installed in the annular groove 121, the outer diameter of the retaining ring 15 is larger than the diameter of the first through hole 531, the retaining ring 15 abuts against the bottom surface of the mounting plate 53, and the top surface and the bottom surface of the mounting plate 53 abut against the insulating part 11 and the retaining ring 15, respectively, so as to limit the longitudinal relative position of the hand piece 1 and the mounting plate 53.

The gear transmission mechanism comprises a manual gear 2, a driven gear 3, an electric gear 4 and a ratchet wheel 42.

And a manual gear 2 provided on the left side of the driven gear 3 and engaged therewith. As shown in fig. 5, a plurality of first ratchets 21 are disposed on the inner wall of the manual gear 2, one side of each first ratchet 21 is a first vertical surface 211 capable of abutting against the connecting shaft 13, and the other side is a first inclined surface 212 capable of slidably engaging with the connecting shaft 13. A first elastic member 22 is disposed between the manual gear 2 and the middle cover bottom plate 521 of the housing 5, the first elastic member 22 applies an elastic force to the manual gear 2 to make the first ratchet 21 vertically abut against the connecting shaft 13, and in this embodiment, the first elastic member 22 is a spring.

The driven gear 3 is connected with an operating handle 32 through a connecting rod assembly 31, and the operating handle 32 is used for driving the switching device to switch on and off.

The electric gear 4, which is a transmission member, is disposed at the right side of the driven gear 3 and is engaged with the driven gear 3, as shown in fig. 7-10, the electric gear 4 is rotatably mounted on the rotating shaft 41 of the motor 40. The electric gear 4 is symmetrically provided with two torsion springs 44, two sliding grooves 47, two rivets 45, and two fixing blocks 46 along the center thereof.

And a torsion spring 44 disposed on a surface of the electric gear 4 and located on a side of the ratchet wheel 42, wherein the torsion spring 44 has a first operating state abutting against the second vertical surface 431 of the second ratchet 43 and a second operating state slidably engaged with the second sliding surface 432 of the second ratchet 43, as shown in fig. 8 and 10. The main body of the torsion spring 44 is sleeved on the rivet 45, and has one end adapted to be inserted into the first slot 461, and the other end having a horizontal section 441 disposed above the ratchet 42, and a vertical section 442 perpendicular to the horizontal section 441 and capable of abutting against the second vertical surface 431. In this embodiment, there are two torsion springs 44, and the two torsion springs 44 are symmetrically arranged along the center of the transmission member. The spout 47, locate electronic gear 4, it can supply vertical section 442 to insert, and two ascending lateral walls 471 of spout 47 width direction can with vertical section 442 blocks the cooperation, and two lateral walls 471 of spout 47 can prevent that vertical section 442 from taking place to warp (warp and indicate vertical section 442 and horizontal section 441 to become the obtuse angle for the right angle from original contained angle) under the great drive power effect of second ratchet 43 to guarantee that vertical section and the laminating of second perpendicular face offset, further improved the reliability like this. The rivet 45 has a head with a size larger than that of the main body of the torsion spring 44. And a ratchet wheel 42 provided on the rotating shaft 41 and rotating in conjunction with the rotating shaft 41, wherein a plurality of second ratchet teeth 43 are provided on an outer side of the ratchet wheel 42, and the second ratchet teeth 43 have a second vertical surface 431 provided on one side and a second sliding surface 432 provided on the other side. In this embodiment, because torsional spring 44 has certain elasticity, it can play the effect with second ratchet 43 complex when having the reset function concurrently, and the structure is simpler like this, has reduced manufacturing cost. The fixing block 46 is disposed on the electric gear 4, a first slot 461 is formed between the fixing block 46 and the electric gear 4, and one end of the torsion spring 44 abuts against a surface of the fixing block 46 adjacent to the ratchet wheel 42, or is wound on a surface of the fixing block 46.

The protection mechanism comprises an indicator 6, a selector switch, a circuit board 8 and a control unit.

An indicator 6, as shown in fig. 11-16, is movably mounted on the housing 5 above the toggle switch 7, with one edge of the indicator 6 disposed adjacent to the right side of the circuit board 8. The indicator 6 has a first indicating position adapted to block the external handle operating hole 511 corresponding to the automatic mode, and a second indicating position to expose the operating hole 511 corresponding to the manual mode. The indicating part 6 is provided with an indicating part 61 and a baffle part 62 arranged on one side of the indicating part 61, the baffle part 62 is provided with a second through hole 621 which is communicated with the operating hole 511 correspondingly, the indicating part 61 is provided with a second poke rod 63 and an indicating mark 64 for indicating a manual/automatic state and a moving direction, and the bottom of the indicating part 6 is also provided with a second slot 60.

Change over switch, for toggle switch 7, toggle switch 7 welds the side of circuit board 8, and toggle switch 7 is equipped with the first poker rod 71 that can peg graft with second slot 60 adaptation, thereby with indicator 6 linkage removal, wherein, toggle switch 7 has the first signal trigger position that corresponds automatic mode to and the second signal trigger position that corresponds manual mode, also when toggle switch 7 switches the action at first signal trigger position and second signal trigger position, can send the signal to the control unit, with the mode of operation (manual/automatic) that indication switch device located.

As an alternative embodiment, the change-over switch may also be a microswitch.

The circuit board 8 is connected to the control unit by means of a wire 81. Utility model human ingenious realizes the linkage with indicator 6 and toggle switch 7 to when the indicator 6 position takes place to remove, toggle switch 7 can transmit action signal for the control unit, and the switching device is judged to the control unit accessible action signal and is in automatic mode or manual mode, thereby according to setting for the requirement control switching device, has avoided the maloperation like this, has improved fail safe nature.

As an alternative embodiment, as shown in fig. 17 and 18, a first hook 532 is provided on the right edge of the top surface of the mounting plate 53, a plurality of gate-shaped through holes 526 are formed on the middle cover bottom plate 521, and are disposed between the mounting post 523 and the operating handle 32 and adapted to fix the wires 81, and the wires 81 are connected to the control unit after sequentially passing through the first hook 532 and the plurality of gate-shaped through holes 526.

As an alternative embodiment, as shown in fig. 19 and 20, a wire guide groove 527 is formed at the top of the mounting post 523, a plurality of second hook portions 528, which are disposed between the mounting post 523 and the operating handle 32 and are adapted to fix the wire 81, are formed on the middle cover bottom plate 521, and the wire 81 is connected to the control unit after sequentially passing through the wire guide groove 527 and the plurality of second hook portions 528.

In this embodiment, the driven gear 3 is a plastic insulator, and the manual gear 2 and the electric gear 4 are iron members.

As an alternative embodiment, the manual gear 2, the electric gear 4 and the connecting rod assembly 31 may be plastic insulators.

In this embodiment, the switch device may be a circuit breaker or a dual power transfer switch.

The operating principle of the transmission gear mechanism of the embodiment is as follows:

during manual switching-on, the hand piece 1 rotates clockwise under the action of the external handle, the connecting shaft 13 abuts against the first vertical surface 211 of the first ratchet 21 of the hand gear 2, so that the hand gear 2 is driven to rotate clockwise, the driven gear 3 meshed and connected with the hand gear 2 is driven to rotate anticlockwise, and the driven gear 3 drives the switching device to switch on through the connecting rod assembly 31 and the operating handle 32.

During electronic combined floodgate, motor 40 drives ratchet 42 clockwise through pivot 41 and rotates, and the second perpendicular face 431 of ratchet 42 second ratchet 43 offsets with the vertical section 442 of torsional spring 44 to drive electronic gear 4 clockwise, and then drive the driven gear 3 anticlockwise rotation of being connected with electronic gear 4 meshing, driven gear 3 drives switching device combined floodgate through link assembly 31, operating handle 32.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims (10)

1. A safety-insulated operating system, comprising a hand piece (1) driven by an external handle, and a gear transmission connected to the hand piece (1), wherein at least one of the hand piece (1) and the gear transmission is an insulator.

2. The safety insulated operating system according to claim 1, wherein the hand piece (1) comprises an insulating part (11) arranged at the upper end and driven by the external handle to rotate, and a metal shaft (12) arranged at the lower end and driven by the gear transmission mechanism to act.

3. The safety-insulated operating system according to claim 2, characterized in that the gear transmission comprises:

the driven gear (3) is connected with an operating handle (32) through a connecting rod assembly (31), and the operating handle (32) is used for driving the switching device to be switched on and off;

manual gear (2) and electronic gear (4) are located separately the both sides of driven gear (3), and all with driven gear (3) meshing is connected, manual gear (2) receive manual piece (1) drive rotates, electronic gear (4) receive motor (40) drive and rotate.

4. A safety insulated operating system according to claim 3, characterized in that the driven gear (3) is an insulating piece, and the manual gear (2), the motorized gear (4) and the connecting rod assembly (31) are all metal pieces.

5. Safety-insulated operating system according to claim 3 or 4, characterized in that a first clutch mechanism preventing the reverse rotation of the motor (40) is provided between the hand piece (1) and the hand gear (2).

6. The safety-insulated operating system according to claim 5, characterized in that the first clutch mechanism comprises:

the connecting shaft (13) is vertically arranged on the metal shaft (12);

the first ratchet teeth (21) are arranged on the inner wall of the manual gear (2) at intervals along the circumferential direction, one side of each first ratchet tooth (21) is a first vertical surface (211) which can be abutted against the connecting shaft (13), and the other side of each first ratchet tooth is a first inclined surface (212) which can be in sliding fit with the connecting shaft (13);

and one end of the first elastic piece (22) is abutted against the manual gear (2), and the other end of the first elastic piece is abutted against a middle cover bottom plate (521) of the shell (5).

7. The safety insulated operating system of claim 6, characterized in that the metal shaft (12) is provided with a plurality of functional holes (120) along the height direction thereof at intervals for the connection shaft (13) to pass through.

8. Safety insulated handling system according to any of claims 2, 3, 4, 6, 7, characterized in that the metal shaft (12) is formed with a T-shaped connection block (14) on top, the insulation (11) being integrally formed with the connection block (14) by injection moulding.

9. Safety insulated handling system according to claim 8, characterized in that the hand piece (1) is connected with a mounting plate (53) fixed to a mounting post (523) of the middle cover (52) by means of a mounting structure comprising:

a first through hole (531) provided in the mounting plate (53), the first through hole (531) having a hole diameter smaller than the outer diameter of the insulating portion (11) and larger than the outer diameter of the metal shaft (12);

the annular groove (121) is arranged on one side, close to the insulating part (11), of the metal shaft (12);

and the check ring (15) is arranged in the annular groove (121), the outer diameter of the check ring is larger than the aperture of the first through hole (531), and during assembly, the top surface and the bottom surface of the mounting plate (53) are respectively abutted against the insulating part (11) and the check ring (15).

10. A switchgear comprising a safety insulated operating system according to any of claims 1-9, wherein the switchgear is a molded case circuit breaker or a dual power transfer switch.

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