An electric operating mechanism for a circuit breaker

Abstract

The present invention discloses an electric operating mechanism for a circuit breaker, comprising a housing, a motor disposed within the housing, a gear transmission assembly connected to the motor, a drive shaft connected to the gear transmission assembly and having an operating hole, a cam assembly connected to the drive shaft, a slider assembly connected to the cam assembly and capable of reciprocating motion, a slide plate slidably arranged to cover the operating hole, a first microswitch for turning remote control on or off, a circuit board for receiving and sending control signals, a pressing assembly for pressing a circuit breaker test button, and a safety lock assembly capable of engaging or disengaging with the first microswitch, the safety lock assembly comprising a rotatable lock cylinder and a lock sleeve that cooperates with the lock cylinder. In the present invention, whether after manual or remote opening, the safety lock can be rotated to perform a variety of restrictive operations, thereby effectively preventing the circuit breaker from being closed, thereby better ensuring the safety of maintenance personnel.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breaker automatic control, in particular to an electric operating mechanism for a circuit breaker. Background Art

[0002] A circuit breaker is a switching device used to connect or disconnect an electrical circuit. Its opening and closing operations can be controlled manually locally or remotely via an electric operating mechanism, thus achieving automatic control. When the circuit breaker is being repaired, it needs to be opened. This can be done either manually locally or remotely via the electric operating mechanism. After opening, a safety lock is typically turned to disconnect the motor via a microswitch, thereby disconnecting the remote control and preventing the remote end from closing the circuit breaker. However, existing safety locks only disconnect the remote control by cooperating with a microswitch. Turning the safety lock does not provide other functions to restrict the closing of the circuit breaker. This still poses the risk of accidental closing of the circuit breaker, potentially causing safety accidents and irreparable losses for maintenance personnel. Therefore, there is a need to further improve the existing technology so that, whether opening the circuit breaker manually or remotely, the safety lock can be turned to perform various restrictive operations, effectively preventing the circuit breaker from closing, thereby better ensuring the safety of maintenance personnel. Summary of the Invention

[0003] The present invention overcomes the shortcomings of the prior art and provides an electric operating mechanism for a circuit breaker, which can rotate a safety lock to perform various restriction operations after the circuit breaker is opened, thereby effectively preventing the circuit breaker from being closed and better ensuring the safety of maintenance personnel.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] An electric operating mechanism for a circuit breaker comprises a housing, a motor arranged in the housing, a gear transmission assembly connected to the motor, a drive shaft connected to the gear transmission assembly and having an operating hole, a cam assembly connected to the drive shaft, a slider assembly connected to the cam assembly and capable of reciprocating movement, a slide plate slidably arranged to cover the operating hole, a first micro switch for turning on or off remote control, a circuit board for receiving and sending control signals, a pressing assembly for pressing a circuit breaker test button, and a safety lock assembly that can interfere with or separate from the first micro switch. The safety lock assembly comprises a rotatable lock core and a lock sleeve that cooperates with the lock core. The lock sleeve is provided with a limit block, a limit plate, and an abutment block that can interfere with the first micro switch. When the lock sleeve rotates, the limit block limits the slide plate to prevent it from sliding, the limit plate limits the pressing assembly to prevent it from being pressed, the abutment block disengages from the interference with the first micro switch and limits the slider assembly to prevent it from moving.

[0006] Preferably, the limit block is provided with a first limit surface and a second limit surface, and the first limit surface and the second limit surface are arranged opposite to each other. The slide is provided with a protrusion that cooperates with the limit block. When the slide covers the operating hole, the lock sleeve is rotated and the first limit surface limits the protrusion; when the slide is opened to expose the operating hole, the lock sleeve is rotated and the second limit surface limits the protrusion.

[0007] Preferably, the pressing assembly includes a pressing sleeve, a pressing rod which is arranged through the pressing sleeve and can move axially relative to the pressing sleeve along the pressing sleeve, a button provided on the pressing rod, and a return spring provided between the button and the pressing sleeve. A limit plate is fixed or integrally provided on the pressing rod. When the locking sleeve rotates, the limit plate limits the lower surface of the limit plate.

[0008] Preferably, the slider assembly includes a slide rod and a slider cooperating with the slide rod, the slider is provided with a slot adapted to the abutment block, and when the locking sleeve rotates, the abutment block is inserted into the slot and limits the slider.

[0009] Preferably, it also includes a base, an upper plastic plate, a middle cover and a lower plastic plate arranged in the shell, the safety lock assembly is arranged on the base, the pressing sleeve is fixed on the middle cover, the pressing rod can be arranged through the base, the upper plastic plate is provided with a second micro switch that can cooperate with the slide plate, the lower plastic plate is provided with a accommodating groove for accommodating the motor, and the first micro switch is provided on the lower plastic plate.

[0010] Preferably, the middle cover is provided with a guide slide seat adapted to the slide, the guide slide seat is provided with a positioning piece, the lock sleeve is provided with a positioning groove cooperating with the positioning piece, the slide is provided with a card strip, the card strip is provided with a card contact point, and the shell is provided with a card groove cooperating with the card contact point.

[0011] Preferably, an operating end is provided on the driving shaft, and the operating hole is located on the operating end. The operating end includes an end seat, an intermediate seat and a convex seat provided on the intermediate seat. An annular groove is provided between the end seat and the intermediate seat, and a step surface is formed between the intermediate seat and the convex seat. A turntable is provided on the operating end, and a slot with an opening is provided on the turntable. The opening is adapted to the convex seat and can be inserted into the convex seat. An abutment surface that contacts the step surface is formed between the slot and the opening, and an insert block that can be inserted into the operating hole is provided on the abutment surface. A snap that cooperates with the annular groove is provided on the turntable, and an indicator disk is provided on the turntable.

[0012] Preferably, the buckles are arranged along the circumference of the slot, and there are at least two buckles.

[0013] Preferably, a gear cover plate is provided on the middle cover, and the upper plastic plate is buckled and connected to the gear cover plate.

[0014] Beneficial effects of the present invention:

[0015] The present invention can perform a variety of limiting operations by rotating the safety lock after manual or remote opening, thereby effectively preventing the circuit breaker from performing a closing operation, thereby better ensuring the safety of maintenance personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a specific embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of a structure in which the housing is removed according to a specific embodiment of the present invention. Figure 1 ;

[0018] Figure 3 This is a schematic diagram of a structure in which the housing is removed according to a specific embodiment of the present invention. Figure 2 ;

[0019] Figure 4 This is a schematic diagram of the state of rotating the lock sleeve when the slide covers the operating hole according to a specific embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the state of rotating the lock sleeve when the slide is opened according to a specific embodiment of the present invention;

[0021] Figure 6 The structure of the safety lock assembly of the specific embodiment of the present invention is schematically shown. Figure 1 ;

[0022] Figure 7 The structure of the safety lock assembly of the specific embodiment of the present invention is schematically shown. Figure 2 ;

[0023] Figure 8 This is a schematic diagram of the connection structure between the slide plate and the guide slide seat according to a specific embodiment of the present invention;

[0024] Figure 9 This is a schematic diagram of the installation structure of the pressing assembly according to a specific embodiment of the present invention;

[0025] Figure 10 This is a schematic structural diagram of a pressing assembly according to a specific embodiment of the present invention;

[0026] Figure 11 A schematic diagram of the connection structure of a motor, a gear transmission assembly, a cam assembly, and a drive shaft according to a specific embodiment of the present invention;

[0027] Figure 12 This is a schematic structural diagram of a housing according to a specific embodiment of the present invention;

[0028] Figure 13 This is a structural diagram of an upper plastic plate according to a specific embodiment of the present invention;

[0029] Figure 14 This is a schematic structural diagram of a gear cover plate according to a specific embodiment of the present invention;

[0030] Figure 15 This is a schematic structural diagram of a middle cover according to a specific embodiment of the present invention;

[0031] Figure 16 This is a schematic structural diagram of the lower plastic plate according to a specific embodiment of the present invention;

[0032] Figure 17 Schematic diagram of the connection structure of the drive shaft, turntable and indicator disk in a specific embodiment of the present invention Figure 1 ;

[0033] Figure 18 Schematic diagram of the connection structure of the drive shaft, turntable and indicator disk in a specific embodiment of the present invention Figure 2 ;

[0034] Figure 19 A schematic structural diagram of a drive shaft according to a specific embodiment of the present invention;

[0035] Figure 20 Schematic diagram of the structure of a turntable according to a specific embodiment of the present invention.

[0036] In the figure: 1. Housing; 11. Motor; 12. Gear transmission assembly; 13. Cam assembly; 14. Circuit board; 15. Base; 16. Upper plastic plate; 161. Second micro switch; 17. Middle cover; 171. Guide slide seat; 172. Positioning piece; 18. Lower plastic plate; 181. Accommodation groove; 182. First micro switch; 19. Gear cover; 2. Drive shaft; 21. Operating hole; 22. Operating end; 221. End seat; 222. Middle seat; 223. Boss seat; 224. Annular groove; 225. Step surface; 23. Turntable; 231. Slot; 232. Opening; 233. Abutment surface; 234. Insert block; 2 35. Buckle; 24. Indicator plate; 3. Slider assembly; 31. Slide rod; 32. Slider; 33. Slot; 4. Slide plate; 41. Protrusion; 42. Card strip; 421. Card contact; 5. Press assembly; 51. Press sleeve; 52. Press rod; 53. Button; 54. Return spring; 55. Limit plate; 6. Safety lock assembly; 61. Lock cylinder; 62. Lock sleeve; 621. Positioning groove; 63. Limit block; 631. First limit surface; 632. Second limit surface; 64. Limit plate; 65. Abutment block; 7. Card slot. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] like Figure 1-20As shown, an electric operating mechanism for a circuit breaker includes a housing 1, a motor 11 disposed in the housing 1, a gear transmission assembly 12 connected to the motor 11, a drive shaft 2 connected to the gear transmission assembly 12 and having an operating hole 21, a cam assembly 13 connected to the drive shaft 2, a slider assembly 3 connected to the cam assembly 13 and capable of reciprocating movement, a slide plate 4 slidably arranged to cover the operating hole 21, a first micro switch 182 for turning on or off remote control, a circuit board 14 for receiving and sending control signals, and a circuit board 53 for pressing a circuit breaker test button. The pressing assembly 5 and the safety lock assembly 6 that can interfere with or separate from the first micro switch 182, the safety lock assembly 6 includes a rotatable lock cylinder 61 and a lock sleeve 62 that cooperates with the lock cylinder 61, and the lock sleeve 62 is provided with a limit block 63, a limit piece 64 and an abutment block 65 that can interfere with the first micro switch 182. When the lock sleeve 62 rotates, the limit block 63 limits the slide 4 so that it cannot slide, the limit piece 64 limits the pressing assembly 5 so that it cannot be pressed, and the abutment block 65 disengages from the interference with the first micro switch 182 and engages the slider assembly The first limiting surface 631 and the second limiting surface 632 are arranged opposite to each other on the limiting block 63. The slide plate 4 is provided with a protrusion 41 that cooperates with the limiting block 63. When the slide plate 4 covers the operating hole 21, the lock sleeve 62 is rotated, and the first limiting surface 631 limits the protrusion 41. When the slide plate 4 is opened to expose the operating hole 21, the lock sleeve 62 is rotated, and the second limiting surface 632 limits the protrusion 41. The pressing assembly 5 includes a pressing sleeve 51, a pressing sleeve 51 and a locking sleeve 62. A pressing rod 52 that can move axially along the pressing sleeve 51 relative to the pressing sleeve 51, a button 53 provided on the pressing rod 52, and a return spring 54 provided between the button 53 and the pressing sleeve 51, a limit plate 55 is fixed or integrated with the pressing rod 52, and when the locking sleeve 62 rotates, the limit plate 64 limits the lower surface of the limit plate 55; the slider assembly 3 includes a slide rod 31 and a slider 32 that cooperates with the slide rod 31, and a slot 33 that is adapted to the abutment block 65 is provided on the slider 32. When the locking sleeve 62 rotates, the abutment block 65 is inserted into the slot 33 and limits the slider 32.

[0039] When the breaker is manually opened, the slide plate 4 is opened to expose the operating hole 21, and then the special tool is inserted into the operating hole 21 to rotate the drive shaft 2, thereby realizing manual opening of the breaker. Subsequently, the key is inserted into the lock cylinder 61, and the lock cylinder 61 rotates to drive the lock sleeve 62 to rotate. At this time, the lock sleeve 62 rotates, and the limit block 63 limits the slide plate 4 to prevent it from sliding. Specifically, the second limit surface 632 of the limit block 63 limits the protrusion 41, so that the slide plate 4 cannot be closed; the abutment block 65 disengages from the interference with the first microswitch 182, thereby disconnecting the remote control of the circuit breaker, and the abutment block 65 will be inserted into the slot 33 to limit the slider 32, so as to better prevent the slider 32 from sliding and closing the breaker accidentally; and the limit plate 64 rotates to the bottom of the limit plate 55, limiting the lower surface of the limit plate 55, so that the pressing component 5 cannot be pressed. Figure 5 After the remote control is opened, the lock sleeve 62 is rotated, and the limit block 63 limits the slide plate 4. Specifically, the first limit surface 631 of the limit block 63 limits the protrusion 41, so that the slide plate 4 cannot be opened, thereby preventing manual operation of the drive shaft 2 to close the switch, further improving safety. The abutment block 65 is separated from the interference with the first micro switch 182 and inserted into the slot 33, also limiting the slider 32, and the limit piece 64 limits the pressing component 5. The specific actions are as follows. Figure 4 As shown. In this way, no matter whether the circuit breaker is opened manually or remotely, the rotating safety lock can perform various limiting operations, thereby effectively preventing the circuit breaker from closing, thus better ensuring the safety of maintenance personnel.

[0040] As a specific improvement, it also includes a base 15, an upper plastic plate 16, a middle cover 17 and a lower plastic plate 18 arranged in the shell 1, the safety lock assembly 6 is arranged on the base 15, the pressing sleeve 51 is fixed on the middle cover 17, the pressing rod 52 can be set through the base 15, the upper plastic plate 16 is provided with a second micro switch 161 that can cooperate with the slide plate 4, the lower plastic plate 18 is provided with a accommodating groove 181 for accommodating the motor 11, and the first micro switch 182 is provided on the lower plastic plate 18.

[0041] By adopting the above technical solution, such a configuration makes the overall structure more compact, reasonable and easy to assemble, and the second micro switch 161 is set in series with the first micro switch 182, and is also used to connect or disconnect the remote control. When the slide plate 4 covers the operating hole 21, the slide plate 4 conflicts with the second micro switch 161, and the remote control is connected. When the slide plate 4 is opened, the slide plate 4 disengages from the conflict with the second micro switch 161, and the remote control is disconnected. With such a configuration, when manual opening is performed, opening the slide plate 4 can disconnect the remote control, facilitate manual opening operation, and prevent remote closing action, thereby further ensuring safety. The setting of the accommodating groove 181 facilitates the fixed installation of the motor 11, and a micro switch positioning structure (not shown in the figure) is provided on the upper plastic plate 16 and the lower plastic plate 18, which can facilitate the positioning and installation of the first micro switch 182 and the second micro switch 161.

[0042] As an improved specific embodiment, the middle cover 17 is provided with a guide slide seat 171 adapted to the slide plate 4, the guide slide seat 171 is provided with a positioning piece 172, the lock sleeve 62 is provided with a positioning groove 621 cooperating with the positioning piece 172, the slide plate 4 is provided with a clamping strip 42, the clamping strip 42 is provided with a clamping point 421, and the shell 1 is provided with a clamping groove 7 cooperating with the clamping point 421.

[0043] By adopting the above technical solution, the arrangement of the positioning piece 172 and the positioning slot 621 can be used to control the rotation angle of the lock sleeve 62, so that the safety lock assembly 6 can smoothly perform the limiting effect. The arrangement of the engaging point 421 and the engaging slot 7 can facilitate the opening or closing of the slide plate 4.

[0044] As an improved specific embodiment, an operating end 22 is provided on the drive shaft 2, and the operating hole 21 is located on the operating end 22. The operating end 22 includes an end seat 221, an intermediate seat 222 and a convex seat 223 provided on the intermediate seat 222. An annular groove 224 is provided between the end seat 221 and the intermediate seat 222, and a step surface 225 is formed between the intermediate seat 222 and the convex seat 223. A turntable 23 is provided on the operating end 22. A slot 231 with an opening 232 is provided on the turntable 23. The opening 232 is adapted to the convex seat 223 and can be inserted into the convex seat 223. A contact surface 233 that contacts the step surface 225 is formed between the slot 231 and the opening 232. A plug-in block 234 that can be inserted into the operating hole 21 is provided on the abutment surface 233. A snap 235 that cooperates with the annular groove 224 is provided on the turntable 23, and an indicator disk 24 is provided on the turntable 23.

[0045] By adopting the above technical solution, the rotary disc 23 can be well positioned and fixed on the drive shaft 2, and the setting of the indicator disc 24 facilitates the display of the opening and closing states.

[0046] As an improved specific implementation, the buckles 235 are arranged along the circumference of the slot 231 , and at least two buckles 235 are provided.

[0047] By adopting the above technical solution, three or four buckles 235 can also be provided, as long as it can ensure that the turntable 23 and the driving shaft 2 have a good connection stability.

[0048] As an improved specific implementation manner, a gear cover plate 19 is provided on the middle cover 17 , and the upper plastic plate 16 is buckled and connected to the gear cover plate 19 .

[0049] By adopting the above technical solution, the arrangement of the gear cover plate 19 can provide good protection for the gear transmission assembly 12 and also facilitate the positioning and installation of the upper plastic plate 16 .

[0050] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An electric operating mechanism for a circuit breaker, comprising a housing, a motor disposed within the housing, a gear transmission assembly connected to the motor, a drive shaft connected to the gear transmission assembly and having an operating hole, a cam assembly connected to the drive shaft, a slider assembly connected to the cam assembly and capable of reciprocating motion, a slide plate slidably disposed to cover the operating hole, a first microswitch for turning on or off remote control, a circuit board for receiving and sending control signals, a pressing assembly for pressing a circuit breaker test button, and a safety lock assembly capable of engaging or disengaging with the first microswitch, characterized in that: The safety lock assembly includes a rotatable lock core and a lock sleeve that cooperates with the lock core. The lock sleeve is provided with a limit block, a limit plate, and an abutment block that can cooperate with the first micro switch. When the lock sleeve rotates, the limit block limits the slide plate so that it cannot slide, the limit plate limits the pressing assembly so that it cannot be pressed, and the abutment block disengages from the interference with the first micro switch and limits the slider assembly so that it cannot move. The limiting block is provided with a first limiting surface and a second limiting surface, which are arranged opposite to each other. The slide is provided with a protrusion that cooperates with the limiting block. When the slide covers the operating hole, the lock sleeve is rotated so that the first limiting surface limits the protrusion; when the slide is opened to expose the operating hole, the lock sleeve is rotated so that the second limiting surface limits the protrusion. The pressing assembly includes a pressing sleeve, a pressing rod passing through the pressing sleeve and movable relative to the pressing sleeve along the axial direction of the pressing sleeve, a button provided on the pressing rod, and a return spring provided between the button and the pressing sleeve. A limit plate is fixed or integrally provided on the pressing rod. When the locking sleeve rotates, the limit plate limits the lower surface of the limit plate. The slider assembly includes a slide rod and a slider matched with the slide rod. The slider is provided with a slot adapted to the abutment block. When the lock sleeve rotates, the abutment block is inserted into the slot and limits the slider. It also includes a base, an upper plastic plate, a middle cover and a lower plastic plate arranged in the shell. The safety lock assembly is arranged on the base, the pressing sleeve is fixed on the middle cover, the pressing rod can be arranged through the base, the upper plastic plate is provided with a second micro switch that can cooperate with the slide plate, the lower plastic plate is provided with a accommodating groove for accommodating the motor, the first micro switch is arranged on the lower plastic plate, and the second micro switch is connected in series with the first micro switch.

2. The electric operating mechanism for a circuit breaker according to claim 1, characterized in that: The middle cover is provided with a guide slide seat adapted to the slide, the guide slide seat is provided with a positioning piece, the lock sleeve is provided with a positioning groove matched with the positioning piece, the slide is provided with a card strip, the card strip is provided with a card contact point, and the shell is provided with a card groove matched with the card contact point.

3. The electric operating mechanism for a circuit breaker according to claim 1, characterized in that: An operating end is provided on the driving shaft, and an operating hole is located on the operating end. The operating end includes an end seat, an intermediate seat and a convex seat provided on the intermediate seat. An annular groove is provided between the end seat and the intermediate seat, and a step surface is formed between the intermediate seat and the convex seat. A turntable is provided on the operating end, and a slot with an opening is provided on the turntable. The opening is adapted to the convex seat and can be inserted into the convex seat. An abutment surface that contacts the step surface is formed between the slot and the opening, and an insert block that can be inserted into the operating hole is provided on the abutment surface. A snap that cooperates with the annular groove is provided on the turntable, and an indicator disk is provided on the turntable.

4. The electric operating mechanism for a circuit breaker according to claim 3, characterized in that: The buckles are arranged along the circumference of the slot, and there are at least two buckles.

5. The electric operating mechanism for a circuit breaker according to claim 1, characterized in that: A gear cover plate is provided on the middle cover, and the upper plastic plate is buckled and connected with the gear cover plate.

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