Intelligent direct-current circuit breaker handcart electric operating mechanism and circuit breaker

Abstract

The utility model discloses an intelligent direct-current circuit breaker handcart electric operating mechanism and a circuit breaker in the technical field of power switch control equipment circuit breakers, and the intelligent direct-current circuit breaker handcart electric operating mechanism comprises an intelligent monitoring device and a handcart operating mechanism which are installed on a cabinet door, and a handcart is provided with a handcart position contact electrically connected with the intelligent monitoring device. The handcart operating mechanism comprises a brushless motor with a speed reducing mechanism, a rotary transmission direction conversion device and a lead screw driving structure penetrating into the cabinet door, the axial direction of the brushless motor is parallel to the cabinet door, and a motor shaft of the brushless motor is connected with the lead screw driving structure through the rotary transmission direction conversion device; the lead screw driving structure drives the lead screw pair to shake the handcart in and out, the brushless motor is electrically connected with the intelligent monitoring device and is started or stopped under the control of the intelligent monitoring device according to collected handcart position contact information, and the scheme solves the problems that in the prior art, transmission efficiency is low, intelligent control cannot be achieved, and safety is not achieved. The beneficial effects of reducing the size, prolonging the service life and improving the safety are achieved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of power switch control equipment circuit breaker, in particular to an intelligent DC circuit breaker handcart electric operating mechanism and a circuit breaker. BACKGROUND

[0002] The manual operation mode is still generally used for the test position to the working position of the DC switch cabinet circuit breaker handcart, and the circuit breaker handcart mechanism can not be quickly isolated from the fault loop under abnormal working conditions on the line side, which can lead to further expansion of the accident, and the difference in skill level of the operating personnel can also cause damage to the circuit breaker handcart mechanism. Later, the manual operation is gradually replaced by electric driving, but the technical architecture is relatively basic, the motor adopts a brush motor, the brush is easy to wear and needs to be frequently replaced, an open-loop control is used for the monitoring device, basic overcurrent protection is used for safety, and the mechanical design is not stable enough, the driving system is not high in efficiency, the motor is short in service life, the position control precision is not high, the torque fluctuation is large, and the intelligent control is lacked, so the circuit breaker handcart electric operating mechanism and the circuit breaker cannot meet the requirements of modern power systems in high efficiency, intelligence and safety. SUMMARY

[0003] In view of the defects of the prior art, the application provides an intelligent DC circuit breaker handcart electric operating mechanism and a circuit breaker to solve the problems of low transmission efficiency, inability to intelligent control and insecurity of the prior art.

[0004] To achieve the above purpose, the application is implemented by the following technical scheme:

[0005] An intelligent DC circuit breaker handcart electric operating mechanism is used for a handcart of a circuit breaker cabinet with a cabinet door, a lead screw pair perpendicular to the cabinet door is arranged on the handcart and moves linearly on the inner side of the cabinet door in the direction perpendicular to the cabinet door under the action of the lead screw pair, the handcart comprises an intelligent monitoring device mounted on the cabinet door, the handcart comprises a handcart operating mechanism mounted on the cabinet door and located outside the cabinet door, the handcart is provided with handcart position contacts electrically connected with the intelligent monitoring device, the handcart operating mechanism comprises a brushless motor with a speed reduction mechanism, a rotary transmission direction conversion device and a lead screw driving structure penetrating into the cabinet door, the brushless motor is parallel to the cabinet door in the axial direction, the motor shaft is connected through the rotary transmission direction conversion device and the lead screw driving structure, the lead screw driving structure drives the lead screw pair to shake the handcart in and out, and the brushless motor is electrically connected with the intelligent monitoring device and starts or stops under the control of the intelligent monitoring device according to the collected handcart position contact information.

[0006] Preferably, the rotary transmission direction conversion device uses a bevel gear pair comprising a first bevel gear and a second bevel gear, the first bevel gear is perpendicular to the brushless motor in the axial direction and is mechanically connected with the lead screw driving structure, and the second bevel gear is mounted on the brushless motor shaft and meshes with the second bevel gear.

[0007] Preferably, the screw drive structure uses a shaft crank handle, which rotates the screw through a head slot.

[0008] Preferably, the intelligent monitoring device includes a local interaction device and a state indicating device, the local interaction device is used to accept local interaction and control the start or stop of the brushless motor, and the state indicating device is used to display the handcart position information and the state of the intelligent monitoring device.

[0009] Preferably, it further includes a circuit breaker auxiliary contact point, which is electrically connected with the intelligent monitoring device and is used to determine the locking state of the handcart operating mechanism according to the circuit breaker state to complete the circuit breaker interlocking control.

[0010] Preferably, it further includes a grounding switch auxiliary contact point, which is electrically connected with the intelligent monitoring device and is used to determine the locking state of the handcart operating mechanism according to the grounding switch state to complete the ground knife interlocking control.

[0011] Preferably, it further includes a remote control communication module, which is electrically connected with the intelligent monitoring device and is used to receive a remote control signal to control the start or stop of the brushless motor.

[0012] Preferably, the handcart position contact point includes a handcart working position auxiliary contact point and a handcart test position auxiliary contact point, which are used to transmit signals of the movement of the handcart to the working position and the test position to the intelligent monitoring device, the local interaction device includes a roll-in button and a roll-out button, the roll-in button is used to locally control the movement of the handcart to the working position, and the roll-out button is used to locally control the movement of the handcart to the test position.

[0013] Preferably, the state indicating device includes an indicating lamp, which is used to indicate the position to which the handcart moves.

[0014] Based on the same inventive concept, the application also discloses a circuit breaker, which includes a cabinet door and a handcart inside the cabinet door, and uses the aforementioned intelligent DC circuit breaker handcart electric operating mechanism.

[0015] The application has the advantages that the intelligent DC circuit breaker handcart electric operating mechanism is suitable for modularized DC circuit breaker cabinet, forms a closed loop system through real-time feedback adjustment, improves operation precision and reliability, and provides multiple protection for motor driving circuit in safety and reliability; the brushless motor and speed reducer scheme is adopted to realize stable control and accurate positioning of the handcart into and out of the cabinet body in cooperation with a high-precision position sensor; the monitoring device can dynamically adjust driving torque according to load changes such as mechanical resistance and current fluctuation, avoids equipment damage caused by sticking or overloading, integrates the motor, the speed reduction mechanism and the monitoring device in a compact module, reduces mechanical transmission links, thereby reducing the volume, is suitable for DC cabinet environment with limited space, reduces maintenance complexity, improves driving efficiency by 20% to 30%, doubles the service life, improves position control precision to one tenth of the original, has smaller torque fluctuation, can monitor motor operating voltage, and is convenient for handcart operation command, external operation interlocking, handcart position and other parameter adjustment, and improves the intelligent level of the electric handcart. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A schematic view of an embodiment of the application installed on a high-voltage chamber cabinet door;

[0017] Figure 2 A three-dimensional schematic view of an embodiment of the handcart operating mechanism of the application installed on a handcart;

[0018] Figure 3 A schematic view of the connection between an embodiment of the application;

[0019] Figure 4 A three-dimensional schematic view of an embodiment of the handcart operating mechanism of the application;

[0020] Figure 5 A side view schematic view of an embodiment of the handcart operating mechanism of the application without a base support and a main cover;

[0021] Figure 6 A sectional view schematic view of the center surface of a main cover of an embodiment of the handcart operating mechanism of the application;

[0022] Wherein, 1-trolley, 11-trolley operating mechanism, 1101-base support, 1102-motor cover, 1103-main cover, 1104-shaft crank handle, 1105-rubber plate, 1106-pair of clamping type fixed motor device, 1107-shaft transmission, 1108-bearing plate, 1109-rear cover, 1110-box cover, 1111-motor flange, 1112-bearing groove, 1113-first bevel gear, 1114-second bevel gear, 1115-circular interval, 1116-first bearing, 1117-second bearing, 1118-cover shaft, 1119-brushless motor, 12-trolley working position auxiliary contact, 13-trolley test position auxiliary contact, 2-intelligent monitoring device, 21-tilt-in button, 22-tilt-out button, 23-reset button, 24-indicator light, 25-display screen, 3-cabinet door, 4-circuit breaker auxiliary contact, 5-grounding switch auxiliary contact, 6-remote control communication module. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0024] The present application provides an embodiment of an intelligent DC circuit breaker trolley electric operating mechanism: the embodiment is used for a trolley 1 of a circuit breaker cabinet with a cabinet door 3, a lead screw pair perpendicular to the cabinet door 3 is arranged on the trolley 1 and moves linearly along the direction perpendicular to the cabinet door 3 between the test position and the working position on the inside of the cabinet door 3 under the action of the lead screw pair, the trolley electric operating mechanism comprises an intelligent monitoring device 2 installed on the cabinet door 3, the trolley 1 comprises a trolley operating mechanism 11 installed on the cabinet door 3 and located outside the cabinet door 3, the trolley 1 is provided with trolley position contacts electrically connected with the intelligent monitoring device 2, the trolley position contacts comprise a trolley working position auxiliary contact 12 and a trolley test position auxiliary contact 13, and the trolley working position auxiliary contact 12 and the trolley test position auxiliary contact 13 are used for transmitting signals of the movement of the trolley 12 to the working position and the test position to the intelligent monitoring device 2.

[0025] The handcart operating mechanism 11 comprises a brushless motor 1119 with a speed reduction mechanism, a rotary transmission direction conversion device and a lead screw driving structure penetrating the cabinet door 3. In this embodiment, the upper part of the brushless motor 1119 is a speed reduction mechanism, and the lower part is a motor structure, which can significantly reduce the motor speed and increase the output torque of the brushless motor 1119. The brushless motor 1119 is packaged in the main cover 1103 through the motor cover 1102 at the bottom. The end face of the speed reduction mechanism of the brushless motor 1119 is fixed to the upper surface of the internal step of the motor flange 1111 by four downward screws. The main cover 1103 is fixed to the bottom surface of the motor flange 1111 by four upward screws from the lower part of the flange. An annular gap is provided between the inner wall of the main cover 1113 and the brushless motor 1119 for the wiring of the electrical connection between the brushless motor 1119 and the intelligent monitoring device 2, and a wire outlet notch is left at the top front middle intersection with the flange.

[0026] The brushless motor 1119 is parallel to the cabinet door 3 in the axial direction. The motor shaft is connected through the rotary transmission direction conversion device and the lead screw driving structure. The lead screw driving structure drives the lead screw pair to shake the handcart 1 in and out. The brushless motor 1119 is electrically connected to the intelligent monitoring device 2 and is controlled by the intelligent monitoring device 2 to start or stop according to the collected handcart position contact point information.

[0027] The rotating transmission direction conversion device in this embodiment uses bevel gear pair containing first bevel gear 1113 and second bevel gear 1114, in addition to bevel gear pair, other structures such as universal joint, sliding gear, clutch can also be used to realize the conversion of rotating transmission direction. In this embodiment, the bevel gear pair is packaged in the base support 1101, the front end face of the base support 1101 is fixed on the clamping type fixed motor device 1106 by four forward screws through the plywood 1105, the front end bottom center is also provided with a notch for the cable of the brushless motor 1119 to enter the cabinet door 3 and connect to the intelligent monitoring device 2, the clamping type fixed motor device 1106 is fixed on the cabinet door 3, the first bevel gear 1113 is perpendicular to the brushless motor 1119 and mechanically connected with the lead screw drive structure, the second bevel gear 1114 is installed on the shaft of the brushless motor 1119 and engaged with the second bevel gear 1114. The bottom of the second bevel gear 1114 is fixed with the bearing plate 1108 through four upward screws, the axial center of the second bevel gear 1114 is fixed on the shaft of the brushless motor 1119 through the bearing 1116, the inner and outer surfaces of the bearing 1116 are provided with key grooves, the torque and power of the internal motor shaft and the second bevel gear 1114 are transmitted through key matching, the outside of the bottom of the brushless motor 1119 is sleeved with a bearing groove 1112, the outside of the bearing groove 1112 is packaged in the bottom of the base support 1101 using a stepped annular box cover 1110, similarly, the inside of the first bevel gear 1113 is fixedly installed with the coaxial rod-shaped shaft transmission 1107, the rear part of the bevel gear 1113 is also sleeved with a bearing groove 1112, the bearing plate 1108 is fixed on the rear end face of the first bevel gear 1113 through four forward screws, the outside of the bearing groove 1112 is packaged in the rear part of the base support 1101 using a stepped annular box cover 1110, the rear cover 1109 is fixed on the rear of the box cover 1110 through four forward screws, the cover shaft 1118 is fixed on the center of the rear end face of the shaft transmission 1107 through a forward screw. The front part of the first bevel gear 1113 is also provided with a circular interval 1115 outside the shaft transmission 1107, the front face of the circular interval 1115 is connected with the rear face of the shaft crank handle 1104 using a spring, the second bearing 1117 is also installed between the shaft crank handle 1104 and the base support 1101.

[0028] The lead screw drive structure in this embodiment uses shaft crank handle 1104, the front part of the shaft crank handle 1104 rotates the lead screw by passing through the clamping slot of the head of the cabinet door 3, and the rear part is fixed on the front part of the shaft transmission 1107 through a thick pin.

[0029] The corresponding part of the intelligent monitoring device 2 electrically connected with the brushless motor 1119 is provided with an electric parameter monitoring device for monitoring the current and voltage of the brushless motor 1119. The electric parameter monitoring device can use a Hall current sensor and a voltage sensor, so that the driving torque can be dynamically adjusted according to the load changes such as mechanical resistance and current fluctuation, thereby avoiding the damage of the equipment caused by jamming or overloading.

[0030] The front panel of the intelligent monitoring device 2 is provided with a local interaction device and a state indicating device. The local interaction device is used for accepting local interaction and controlling the start or stop of the brushless motor 1119 to make it rotate forward, reverse or stop. The state indicating device is used for displaying the position information of the handcart 1 and the state of the intelligent monitoring device 2. In the embodiment, the state indicating device includes six indicator lights 24 and a display screen 25. The six indicator lights 24 are power indicator light, ready indicator light, remote control indicator light, working position indicator light, test position indicator light and fault alarm indicator light. The power indicator light is used for indicating the power supply state of the intelligent monitoring device 2. The ready indicator light is used for indicating whether the electric control of the handcart 1 is allowed. The remote control indicator light is used for indicating whether the control is remote control. The working position indicator light and the test position indicator light are used for indicating the position of the handcart 1. The fault alarm indicator light is used for indicating whether the handcart electric operating mechanism is protected and locked. The display screen 25 is used for displaying the current of the brushless motor 119 or fault code. The local interaction device includes a push-in button 21, a push-out button 22 and a reset button 23. The push-in button 21 is used for locally controlling the handcart 1 to move to the working position. The push-out button 22 is used for locally controlling the handcart 1 to move to the test position. The reset button 23 is used for clearing the fault state.

[0031] The intelligent DC circuit breaker handcart electric operating mechanism of the embodiment further includes a circuit breaker auxiliary contact 4, a grounding switch auxiliary contact 5 and a remote control communication module 6. The circuit breaker auxiliary contact 4 is electrically connected with the intelligent monitoring device 2 and is used for determining the locking state of the handcart operating mechanism 11 according to the circuit breaker state to complete the circuit breaker interlocking control. The grounding switch auxiliary contact 5 is electrically connected with the intelligent monitoring device 2 and is used for determining the locking state of the handcart operating mechanism 11 according to the grounding switch state to complete the ground knife interlocking control. The remote control communication module 6 is electrically connected with the intelligent monitoring device 2 and is used for receiving the remote control signal to control the start or stop of the brushless motor 1119 and can also transmit the monitored information to the remote host. In addition to the above-mentioned contacts, other contacts such as five-protection contacts can also be connected. Through these contacts and modules, the intelligent level of the mechanism can be effectively improved. When the handcart 1 advances and jams, the brushless motor 1119 loop is abnormal, the current is excessive and other problems occur, the intelligent monitoring device 2 can send an alarm signal in advance, disconnect the brushless motor 1119 loop and transmit the information to the remote host, so that the maintenance personnel can check and maintain in time, thereby improving the safety of the operation of the handcart 1.

[0032] Based on the same inventive concept, the application also discloses a circuit breaker, which comprises a cabinet door 3 and a trolley 1 in the cabinet door 3, and uses the aforementioned intelligent DC circuit breaker trolley electric operating mechanism. Through the scheme provided by the application, the service life of the motor can be increased from 20,000 hours to 50,000 hours, the control precision of the shaft rotation position can be reduced from ±1° to ±0.1°, and the torque fluctuation can be reduced from 5% to 15% to less than 3%.

[0033] The above is only a preferred specific embodiment of the present application, but the protection scope required by the present application is not limited to this. Any person skilled in the art can make equivalent replacements or changes within the technical range disclosed in the present application according to the technical scheme and inventive concept of the present application, which should be covered in the protection scope of the present application.

Claims

1. A smart DC circuit breaker trolley electric operating mechanism for a trolley (1) of a circuit breaker cabinet with a cabinet door (3), a screw rod pair perpendicular to the cabinet door (3) being arranged on the trolley (1) and moving linearly along a direction perpendicular to the cabinet door (3) inside the cabinet door (3) under the action of the screw rod pair, characterized in that: The handcart (1) comprises a smart monitoring device (2) installed on the cabinet door (3), a handcart operating mechanism (11) installed on the cabinet door (3) and located outside the cabinet door (3), and a handcart position contact electrically connected to the smart monitoring device (2). The handcart operating mechanism (11) comprises a brushless motor (1119) with a speed reduction mechanism, a rotary transmission direction conversion device, and a lead screw driving structure penetrating the cabinet door (3). The brushless motor (1119) is parallel to the cabinet door (3) in the axial direction, and the motor shaft is connected through the rotary transmission direction conversion device and the lead screw driving structure. The lead screw driving structure drives a lead screw pair to move the handcart (1) in and out. The brushless motor (1119) is electrically connected to the smart monitoring device (2) and starts or stops under the control of the smart monitoring device (2) according to the collected handcart position contact information. ​ 2. The intelligent DC circuit breaker cart electric operating mechanism according to claim 1, characterized in that: The rotary transmission direction conversion device uses a bevel gear pair comprising a first bevel gear (1113) and a second bevel gear (1114). The first bevel gear (1113) is perpendicular to the brushless motor (1119) in the axial direction and mechanically connected to the lead screw driving structure. The second bevel gear (1114) is installed on the shaft of the brushless motor (1119) and engages with the second bevel gear (1114).

3. The intelligent DC circuit breaker cart electric operating mechanism of claim 1, wherein: The lead screw driving structure uses a shaft crank handle (1104) that rotates to drive the lead screw through the clamping slot of the head.

4. The intelligent DC circuit breaker cart electric operating mechanism of claim 1, wherein: The smart monitoring device (2) comprises a local interaction device and a state indication device. The local interaction device is used to accept local interaction and control the brushless motor (1119) to start or stop. The state indication device is used to display the position information of the handcart (1) and the state of the smart monitoring device (2).

5. The intelligent DC circuit breaker cart electric operating mechanism of claim 1, wherein: The circuit breaker auxiliary contact (4) is electrically connected to the smart monitoring device (2) to determine the locking state of the handcart operating mechanism (11) according to the circuit breaker state and complete the circuit breaker interlocking control.

6. The intelligent DC circuit breaker cart electric operating mechanism of claim 1, wherein: The grounding switch auxiliary contact (5) is electrically connected to the smart monitoring device (2) to determine the locking state of the handcart operating mechanism (11) according to the grounding switch state and complete the ground knife interlocking control.

7. The intelligent DC circuit breaker cart electric operating mechanism of claim 1, wherein: The remote control communication module (6) is electrically connected to the smart monitoring device (2) to receive remote control signals and control the start or stop of the brushless motor (1119).

8. The intelligent DC circuit breaker cart electric operating mechanism of claim 4, wherein: The handcart position contact comprises a handcart working position auxiliary contact (12) and a handcart test position auxiliary contact (13) for transmitting signals to the smart monitoring device (2) that the handcart moves to the working position and the test position. The local interaction device comprises an in-button (21) and an out-button (22). The in-button (21) is used to locally control the movement of the handcart (1) to the working position, and the out-button (22) is used to locally control the movement of the handcart (1) to the test position.

9. The intelligent DC circuit breaker cart electric operating mechanism of claim 8, wherein: The status indicating device comprises an indicator light (24) for indicating the position to which the trolley (1) is moved.

10. A circuit breaker comprising a cabinet door (3) and a trolley (1) inside the cabinet door, characterized in that: The intelligent DC circuit breaker trolley electric operating mechanism of any one of claims 1-9.

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