JPH05115110A - Electromotive shifting operation device for electric apparatus - Google Patents

Abstract

PURPOSE:To surely prevent the damage of an electromotive equipment and an operation device and besides, prevent shortening of the life time of a driving motor in the case that abnormality occurs in the operation circuit, etc., of the driving motor, in an electromotive shifting operation device for an electric apparatus. CONSTITUTION:The transmission to an output shaft 18 or the break of the driving force of a motor is performed by engaging or releasing the roller at the top of a locking lever 21 with or from the groove 20 made in the sun gear 17 being the differential gear of a planetary reduction gear, and the output shaft 18 is provided integrally with a cam plate 19, and by the projection made at the end of the cam plate 19, the engagement with the recess 20 of the locking lever 21 is compulsively released when the output shaft 18 acts over a steady position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric movement operating device for electric equipment, which is suitable for use as a movement operating device for cutting and inserting a main circuit of a switchgear in a closed type switchgear.

[0002]

2. Description of the Related Art Conventionally, when a switchgear such as a circuit breaker is cut off or inserted into a main circuit in a closed switchgear, an electric movement operation device as shown in FIG. 5 has been conventionally used. In this device, reference numeral 1 denotes a circuit breaker, which is supported by a supporting carriage and is capable of reciprocating with respect to a closed type switching device 2. Equipped with a coupling device. A drive motor 3 is mounted on the circuit breaker 1, and a gear type speed reducer 4 is provided on the output shaft of the motor 3. An operating lever 5 is connected to the output portion of the speed reducer 4, and the operating lever 5 is provided with a pin 5 a provided at its tip end that engages with a groove 7 formed in an upper portion of the support column 6 to allow the operating lever 5 to move. The operating force based on the rotation is transmitted to move the circuit breaker 1.

With the above-described structure, when the circuit breaker 1 is inserted into the main circuit from the state shown in the figure separated from the main circuit, the insertion switch is operated to start the electric motor 3. Then, the operating lever 5 rotates clockwise in the figure via the gear type speed reducer 4, and the circuit breaker 1 moves to the right by the operating force due to the engagement between the pin 5a at the tip and the groove 7, and after a while, The circuit breaker 1 reaches the insertion position. Along with this, the limit switch for insertion operates, the operation contactor of the electric motor 3 returns, and the power is cut off. On the other hand, in the pull-out operation, the electric motor 3 is driven in the reverse rotation direction to the insertion, and the pull-out operation switch operates at the pull-out position to disconnect the electric power of the electric motor 3.

Regarding means for preventing the circuit breaker from being over-inserted, a device provided with a stopper for pressing the wheel of the circuit breaker is disclosed in, for example, JP-A-55-127813.

[0005]

In the conventional electric movement operating device, as described above, the limit switch is operated and the electric power of the electric motor is cut off when the breaker reaches the insertion position or the withdrawal position. However, at this time, if the limit switch does not operate due to some abnormality, the motor continues to rotate and the circuit breaker does not stop, and there is a risk that the operating device as well as the circuit breaker itself will be damaged. .. In particular, in the case of a circuit breaker used in a circuit with a large number of insertion and withdrawal operations, or a large capacity circuit breaker equipped with a large movement operation device, abnormal operation occurs due to excessive contact wear of switches and contactors. There are many opportunities, and there is a risk that this abnormal operation causes damage to the circuit breaker such as breakage of the main circuit member and deformation of the drive unit, resulting in power failure.

The circuit breaker described in the above publication is merely provided with a stopper for preventing the circuit breaker from slipping out of the device, which causes the above-mentioned problems associated with abnormal operation of the limit switch. Does not eliminate

The present invention has been made in view of the above problems, and when an abnormality occurs in the operation circuit of the drive motor, the circuit breaker and the operation device are slightly over-inserted or over-extracted. It is an object of the present invention to obtain an electric movement operation device for electric equipment with high safety that can reliably prevent damage to the equipment.

[0008]

An electric movement operating device for an electric device according to the present invention transmits a driving force of a reversibly controlled electric motor to an output shaft via a speed reducing device having a planetary gear speed reducer. In an electric movement operating device for electric equipment, which operates electric equipment for a certain section, output control for transmitting and cutting off the driving force of the electric motor to the output shaft by locking and releasing the differential shaft of the planetary gear reducer. And means for forcibly releasing the lock of the differential shaft by the output control means when the output shaft is in excessive operation beyond the steady position in cooperation with the output shaft.

[0009]

[Operation] When inserting or pulling out electrical equipment,
By locking the differential shaft of the planetary gear reducer, the rotation of the electric motor is transmitted to the output shaft, and the electric device is moved in the insertion direction or the withdrawal direction. Even if the electric device reaches the insertion or withdrawal completion position, for example, if the motor continues to rotate and the output shaft exceeds the steady position due to an abnormality in the position switch, the forced release mechanism operates and the The locking of the moving shaft is released, the differential shaft becomes free, and the driving force of the electric motor is cut off.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially sectional front view of an electric movement operating device according to an embodiment of the present invention, FIG. 2 is a side view of the electric movement operating device of the same embodiment, and FIG. 3 is an electric driving device of the same embodiment. FIG. 4 is a partial plan view of the movement operating device, and FIG. 4 is a partial side view of the electric movement operating device of the embodiment.

In this embodiment, the electric movement operating device 8
As shown in FIG. 1, the frame is provided with a box-shaped frame 9. A bearing 10 is supported in each of the holes provided on the opposite sides of the frame 9 so as to face each other. A worm wheel gear reducer 11 and a planetary gear reducer 12 are provided in the frame 9, respectively. Worm wheel gear reducer 11
Is composed of a worm gear 13 supported by a bearing plate below one end surface of the frame 9 and a wheel gear 14 meshing with the worm gear 13. On the other hand, the planetary gear speed reducer 12 includes a small sun gear 15 serving as an input shaft, two planetary gears 16 meshing with the small sun gear 15, a large sun gear 17 serving as a differential shaft, and the planetary gear 16 described above. And an output shaft 18, which serves as a revolving shaft and supports the rotation shaft of A cam plate 19 that cooperates with the output shaft 18 is attached to one end (the right end in FIG. 1) of the output shaft 18. Also, the large sun gear 1
As shown in FIGS. 2 and 4, a plurality of (12 in this example) concave grooves 20 are formed on the outer periphery of the outer periphery 7 at equal intervals. A pin 23 with a roller 22 provided at the tip of the locking lever 21 is engageable with the groove 20. Here, the locking lever 21 has the pin 23 at one end and the shaft pin 24 at the other end,
The central portion is swingably supported by the rotating shaft 25, and
The shaft pin 24 is connected to one end of a seesaw lever 26. A shaft 27 is provided at the other end of the seesaw lever 26, and a return spring 28 and an electromagnet 29 are connected to the shaft 27, respectively. The urging force of the return spring 28 acts on the locking lever 21 in the direction to always release the engagement between the roller 22 and the groove 20, and the electromagnet 29.
Is excited, the locking lever 21 moves in the direction in which the roller 22 engages with the groove 20 against the biasing force of the return spring 28.

The outer peripheral portion of the cam plate 19 is
As shown in FIG. 4, an angular range slightly wider than the range of the rotation angle of the output shaft 18 is formed in a concave shape, and both ends of the cam pin 3 are integrally provided with the pin 23.
It is formed in a convex shape sufficient to push up 0 to release the engagement between the roller 22 and the concave groove 20.

As shown in FIG. 3, the output shaft 18 is integrally provided with a switch cam 31.
A switch 32 is arranged opposite to the switch 1. The switch 32 operates in association with the operation of pushing up the cam pin 30 by the cam plate 19 when the output shaft 18 is excessively rotated,
By opening the contactor, the electric motor is disconnected from the power source and stopped, and a circuit is provided to warn that the motor has operated excessively.

The operation of the electric movement operation device having the above-mentioned structure will be described below.

When the insertion operation switch is operated when inserting the circuit breaker from the pulled-out position, the contactor for the insertion circuit operates to start the electric motor. At the same time, the electromagnet 29 is also excited, so that the lock lever 21 is operated against the biasing force of the return spring 28, and after a while, the roller 22 at the tip of the lock lever 21 is separated from the planetary gear reducer 12. The differential shaft is constrained by being engaged with the concave groove 20 of the large sun gear 17, which is the moving shaft. As a result, the rotation of the electric motor is transmitted from the small sun gear 15 to the revolution (output shaft) operation of the planetary gear 16 via the planetary gear 16, and the output shaft 18 starts rotating, so that the circuit breaker moves in the insertion direction. To do.
Then, when the position switch is operated at the insertion completion position, the electric power of the electric motor is cut off and the circuit breaker is stopped.

At this time, when the contactor is inoperative even though the breaker has reached the insertion completion position due to an abnormality in the position switch, the motor continues to rotate and the output shaft 18 is slightly over-inserted. When in the position, the cam plate 30 is pushed up by the cam plate 19 to forcibly release the engagement between the roller 22 of the locking lever 21 and the concave groove 20. As a result, the differential shaft becomes free and the driving force of the electric motor is cut off, so that the movement of the circuit breaker is stopped. Simultaneously with this operation, the switch 32 is operated by the switch cam 31 to open the contactor to stop the electric motor, the electromagnet 29 is demagnetized, and an abnormal display such as an alarm is displayed.

On the other hand, when the circuit breaker is pulled out from the insertion position, the drawer contactor is operated by the operation of the drawer operation switch, and the motor is rotated in the opposite direction to the insertion so that the circuit breaker is different from the above. Reverse operation moves to the pull-out position. Also in this case, overdrawing can be prevented as in the above case.

According to the above-described embodiment, when the locking of the differential shaft is forcibly released, the electric motor is disconnected from the main circuit to prevent continuous operation. It is possible to prevent the life from being shortened due to no-load continuous rotation when using an extremely fast series-wound electric motor or the like.

In the above embodiment, the one applied to the movement operating device for the circuit breaker has been described, but the present invention is applied to the movement operating device between fixed positions of other electric devices and mechanical devices other than the circuit breaker. Can also be applied.

[0021]

As described above, according to the present invention, the planetary gear speed reducer is provided between the motor serving as a drive source and the output shaft,
Since the means for forcibly canceling the differential shaft of this planetary gear reducer is provided in the event of an abnormality, it is possible to reliably prevent the breaker and the operating device from being damaged or damaged when an abnormality occurs in the operating circuit of the electric motor. It is possible to obtain an electric movement operation device for electric equipment with high safety.

[Brief description of drawings]

FIG. 1 is a partially sectional front view of an electric movement operation device according to an embodiment of the present invention.

FIG. 2 is a side view of the electric movement operation device according to the embodiment of the present invention.

FIG. 3 is a partial plan view of an electric movement operation device according to an embodiment of the present invention.

FIG. 4 is a partial side view of the electric movement operation device according to the embodiment of the present invention.

FIG. 5 is an overall configuration diagram of a conventional electric movement operation device.

[Explanation of symbols]

 8 Electric movement operating device 12 Planetary gear reducer 17 Large sun gear 18 Output shaft 19 Cam plate 20 Recessed groove 21 Locking lever 22 Roller 28 Return spring 29 Electromagnet 30 Cam pin 31 Switch cam 32 Switch

Claims (1)

[Claims] 1. An electric movement operation of an electric device, wherein an electric device is moved for a certain section by transmitting the driving force of a reversibly controlled electric motor to an output shaft through a reduction gear equipped with a planetary gear reducer. In the device, output control means for transmitting and cutting off the drive force of the electric motor to the output shaft by locking and releasing the differential shaft of the planetary gear reducer, and the output shaft cooperating with the output shaft to keep the output shaft steady. An electric movement operation device for an electric device, comprising: forcibly releasing means for forcibly releasing the lock of the differential shaft by the output control means when an excessive operation is performed beyond the position.