JPH0556525A - Motor operating unit for electric apparatus - Google Patents

Abstract

PURPOSE:To facilitate control by enhancing stop accuracy when the moving speed fluctuates and also when the operating voltage of drive motor fluctuates considerably. CONSTITUTION:Drive force is transmitted from a motor 27 through a worm wheel reduction gear 13 and a planetary reduction gear 14 to an output shaft 20. Female thread 23 made on the output shaft 20 is engaged with a threaded rod 25 secured to a fixed frame 24 and a clamp plate having a plurality of grooves is applied on the outer periphery of the differential shaft of the planetary reduction gear 14, i.e., a large sun gear 19. A clamp lever to be engaged or disengaged with/from the groove in the clamp plate, respectively, upon motion or stoppage of an electric apparatus is also provided in order to mechanically restrict or release the large sun gear 19 thus moving or stopping the electric apparatus.

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 FIGS. 6 and 7 is conventionally used. ing. In this device, reference numeral 1 denotes a circuit breaker, and the circuit breaker 1 is supported by a supporting carriage and is provided with a switchgear 2
The automatic connection device 3 is provided on the opening / closing device 2 side. A drive motor 4 is mounted on the circuit breaker 1, and a gear type speed reducer 5 is provided on an output shaft of the motor 4. The final gear of the reduction gear 5 is coupled to one end (left end in FIG. 7) of a screw sleeve 6 serving as an output part, and a female screw is formed at the other end (right end in FIG. 7) of the screw sleeve 6. ing. One end of the female screw of the screw sleeve 6 has the opening / closing device 2
Is always engaged with the male screw of the fixed screw rod 7 engaged with. A switch 8 is provided below the circuit breaker 1. The switch 8 is turned on when it engages with a pull-out cam 9 and an insertion cam 10 respectively provided on the board along the movement path of the circuit breaker 1.

With the above configuration, when the circuit breaker 1 is inserted into the main circuit from the state shown in FIGS. 6 and 7 separated from the main circuit, the insertion switch is operated to operate the electric motor. 4 is driven, the rotation of the output shaft is reduced by the speed reducer 5 and transmitted to the screw sleeve 6, and the female screw portion at the right end of the screw sleeve 6 is rotated. Then, the circuit breaker 1 moves to the right and reaches the insertion position because the fixing screw rod 7 is inserted into the screw sleeve 6. When the circuit breaker 1 further advances to a position where it is slightly over-inserted, the switch 8 is operated by the insertion cam 10, whereby the operating contactor of the electric motor 4 is restored and the power is cut off. At this time, since the electric motor 4 still tries to rotate due to inertial force, after the power is cut off, the armature coil of the electric motor 4 is short-circuited to electrically brake suddenly and stop the driven body. To

On the other hand, when the pull-out operation switch is operated during the pull-out operation of the circuit breaker 1 from the main circuit, the electric motor 4 is activated in the reverse rotation direction to that at the time of insertion, whereby the automatic coupling device 3 is disengaged. At this time, the main circuit on the side of the circuit breaker 1 and the main circuit on the side of the switchgear 2 are coupled by the automatic coupling device 3 with a strong contact force, so that a particularly large driving force is required in the initial stage of movement, and the motor 4 For this reason, starting under severe conditions that are almost in a restrained state is repeated for each operation. The contact force becomes larger as the circuit breaker 1 has a larger capacity. When the automatic coupling device 3 is disengaged as described above, the circuit breaker 1 increases in moving speed as the load is reduced, and the switch 8 is operated by the pull-out cam 9 in the pull-out position to operate the electric motor 4. The contactor returns and the power is cut off. Then, after the power is cut off, the armature coil of the electric motor 4 is short-circuited to electrically stop suddenly and the driven body is stopped, as in the case of insertion.

A conventional transmission device for converting a rotary motion into a reciprocating motion is, for example, Japanese Patent Laid-Open No. 1-3177.
The one described in Japanese Patent No. 71 is known.

[0006]

Since the conventional electric movement operation device is constructed as described above, when the circuit breaker is stopped at the insertion position and the withdrawal position, particularly when the circuit breaker has a large movable weight. The inertial effect becomes large, and when sudden braking is performed to ensure stopping accuracy, extremely high stress is generated in each part of the drive unit. Further, as the electric motor mounted on the circuit breaker, a direct winding wheel type with a large starting torque is usually adopted.However, in the case of this type of electric motor, the speed fluctuation characteristic due to the load fluctuation and the power supply voltage fluctuation is extremely high. Therefore, there is a problem that not only the stopping accuracy at the pulling position but also the stopping accuracy at the insertion position is poor, and the stopping position fluctuates greatly. In particular, the stop accuracy at the insertion position is poor, resulting in over-insertion (when trying to obtain the required insertion dimension of the main circuit at low voltage, over-insertion occurs at over voltage).
Then, a collision may occur between the main circuit conductors at the automatic connection part, in which case there is a risk of causing damage to the main circuit member or deformation and damage of the drive part.

Further, the related art described in the above-mentioned publication merely converts the rotational movement of the input shaft into the reciprocating movement by the crank mechanism on the output side. It does not disclose means for solving the problem at the time of the stop operation of the circuit breaker in the mobile operating device.

The present invention has been made in view of the above problems, and not only when the operating voltage of the drive motor fluctuates greatly but also when the moving speed fluctuates,
An object of the present invention is to obtain an electric movement operation device for an electric device that has a high stopping accuracy and can be easily controlled.

[0009]

According to another aspect of the present invention, there is provided an electric movement operating device for an electric device, which transmits a driving force of an electric motor, which is a drive source, to an output section via a speed reducing device having a planetary gear speed reducer. A reciprocal control of an electric motor to reciprocally move the electric device for a certain section, which is an electric movement operating device for an electric device, in which a planetary gear reducer is provided around a small sun gear as a center and around the small sun gear. It consists of a planetary gear that revolves while rotating on its axis and a large sun gear that rotates around the revolution axis of this planetary gear.In addition, a female screw is provided at one end of this output shaft with the revolution shaft of the planetary gear as the output shaft, and a female screw A male screw that engages with is provided on the fixed side, and
A control means is provided for controlling transmission and interruption of the driving force of the electric motor to the output shaft by restraining and releasing the large sun gear of the planetary gear reducer.

[0010]

When the electric device is inserted, the large sun gear shaft is constrained, and the rotation of the electric motor is transmitted from the input shaft to the output shaft via the planetary gear reducer to rotate the output shaft. The rotation of the output shaft continues while the restrained state of the large sun gear shaft continues, whereby the electric device is moved in the insertion direction. Further, at the insertion completion position, the large sun gear is released, so that the sun gear rotates idly and the insertion operation is stopped.

Further, the pulling-out operation of the electric equipment is carried out by the operation opposite to the above-mentioned inserting operation, because the electric motor rotates in the opposite direction to the inserting operation.

[0012]

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

FIG. 1 is a front view showing a partial cross section 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 has a box-shaped frame 11 as shown in FIG.
Is equipped with. Bearings 12 are supported on both side surfaces of the frame 11 at positions facing each other. Also,
A worm wheel reducer 13 is provided in the frame 11.
And a planetary gear reducer 14 are provided. The worm wheel reducer 13 is composed of a worm gear 15 supported by a bearing plate fixed to the lower part of one end surface of the frame 11 and a wheel gear 16 meshing with the worm gear 15. On the other hand, the planetary gear reducer 14 includes a small sun gear 17 that serves as an input shaft, two planet gears 18 that mesh with the small sun gear 17, a large sun gear 19 that serves as a differential shaft, and the planet gear 18 described above. And an output shaft 20 that serves as a revolution shaft that supports the rotation shaft. The output shaft 20 has one end (see FIG.
Is formed on the large-diameter shaft portion 21, and the other end side (on the left side in FIG. 1) is formed on the small-diameter shaft portion 22. The large-diameter shaft portion 21 is configured such that the large sun gear 19 is rotatably supported on the outer peripheral portion and the planetary gear 18 is included in the central portion so that the output shaft 20 itself serves as the revolution shaft of the planetary gear 18. Has been done. The left end of the small-diameter shaft portion 22 is rotatably supported by the bearing 12, and a female screw 23 is formed in the center portion. The female screw 23 is engaged with the screw rod 25 attached to the fixed frame 24. The left end of the shaft of the small sun gear 17 is rotatably supported by the bearing 26, the right end is rotatably supported by the bearing 12, and the wheel gear 16 is mounted slightly inward of the right end. Further, as shown in FIGS. 1 and 2, a drive motor 27 is fastened to a lower portion of the frame 11 by a support plate 28.
The driving force of the electric motor 27 is transmitted to the worm gear 15 via the gears 29 and 30.

Further, as shown in FIG. 2, the large sun gear 19
Is provided with a locking plate 32 in which a plurality of (12 in this example) concave grooves 31 are formed on the outer peripheral portion at equal intervals. The number of the grooves 31 (interval of the grooves) is set in relation to the idling time when the electric motor 27 is started. Further, as shown in FIGS. 1 and 4, a fan-shaped stop plate 33 is attached to the output shaft 20, and concave grooves 34 are formed in the outer peripheral portion of the stop plate 33 near both ends thereof.

As shown in FIGS. 3 and 4, a support member 35 is provided on the upper portion of the frame 11, and a lock pin 37 and a stop lever 38 are rotated by a support pin 36 on the support member 35. It is supported freely. Locking lever 37
Has a roller 40 supported by a pin 39 at the tip, a shaft pin portion 41 at the other end, and a pin hole 42 into which the support pin 36 is fitted at the center. The stop lever 38, like the lock lever 37, has a roller 44 supported by a pin 43 at the tip, a shaft pin portion 45 at the other end, and a pin into which the support pin 36 is fitted in the central portion. It has a hole 46. Then, the roller 40 and the stop lever 38 of these locking levers 37
The rollers 44 are engageable with the concave groove 31 of the locking plate 32 and the concave groove 34 of the stop plate 33, respectively. Here, the position where the recessed groove 34 of the stop plate 33 is provided is set to a start point position and an end point position according to the rotation angle of the output shaft 20 corresponding to the moving operation distance of the circuit breaker 1. Also, output shaft 2
A cam plate (not shown) is attached to 0, and this cam plate operates the position switch at both end positions of the rotation angle of the output shaft 20.

Further, as shown in FIG. 4, the stop lever 38
An upper end of a rod 48 arranged vertically is connected to an arm 47 provided at the base end of the rod 47, and an electromagnet 49 is arranged around the lower end of the rod 48. The spring 5 is provided between the arm 47 of the stop lever 38 and the support body 35.
0 is suspended, and when the electromagnet 49 is excited, the rod 48 moves downward to release the engagement between the roller 44 at the tip of the stop lever 38 and the concave groove 34 of the stop plate 33.
On the other hand, when the electromagnet 49 is de-energized, the stop lever 38 is pressed against the surface of the stop plate 33 by the urging force of the spring 50.

Further, as shown in FIG. 3, the locking lever 37
An equilibrium lever 51 is provided which connects the base end of the stop lever 38 and the base end of the stop lever 38. The balance lever 51 has a center of rotation in the center, and the left end (upper side in FIG. 3) has a stop lever 3
8, the right end (downward in FIG. 3) is engaged with the shaft pin portion 45 of the lock lever 37. Since the locking lever 37 and the stop lever 38 are connected in this way, when the engagement between the stop lever 38 and the concave groove 34 of the stop plate 33 is released by the excitation of the electromagnet 49, the lock lever 37 is locked. When the locking lever 37 is disengaged from the groove 31 of the locking plate 32 and the locking lever 37 is disengaged from the groove 31 of the locking plate 32, the stop lever 38 engages with the groove 34 of the stop plate 33. To meet.

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

First, when inserting the circuit breaker in the pulled-out position, when the insertion operation switch is operated, the contactor for the insertion circuit operates to start the electric motor 27. In this state, since the locking lever 37 is not engaged with the concave groove 31 of the locking plate 32, the large sun gear 19 is free, and therefore the rotation of the electric motor 27 is changed from the gears 29 and 30 to the worm wheel reducer. 13, small sun gear 17 and planetary gear 18
Is transmitted to the large sun gear 19 via the
, The output shaft 20 does not rotate, and the electric motor 27 is started without load. Then, at the same time, the electromagnet 49 is excited, whereby the rod 48 moves downward against the urging force of the spring 50, the stop lever 38 releases the stop plate 33 and frees the output shaft 20, and Stop lever 38
Is transmitted to the locking lever 37 via the balance lever 51, and the roller 40 of the locking lever 37 rolls on the outer periphery of the locking plate 32 and reaches the concave groove 31 to engage with the concave groove 31. To meet.

When the locking plate 32, that is, the large sun gear 19 is locked in this manner, the rotation of the electric motor 27 is rotated by the gear 2
It is transmitted from 9, 30 to the planetary gear 18 via the worm wheel speed reducer 13 and the small sun gear 17, the planetary gear 18 revolves (output shaft), and the output shaft 20 starts to rotate. After that, the electromagnet 49 is excited, the locked state of the large sun gear 19 continues, the rotation of the output shaft 20 continues, and the screw rod 25 engaged with the female screw 23 relatively moves in the axial direction of the rotating shaft 20. Thus, the circuit breaker moves toward the fixed frame 24, that is, in the insertion direction. When the electric motor 27 further rotates and the circuit breaker moves in the insertion direction to reach the insertion completion position, the contactor is closed by the operation of the insertion position switch, the electromagnet 49 is demagnetized, and the stop lever 38 is urged by the spring 50. It rotates to engage with the groove 34. At the same time, the locking lever 37 is disengaged from the concave groove 31 of the locking plate 32, and the large sun gear 19 is free to rotate idly, so that the movement operation of the circuit breaker is immediately stopped. On the other hand, the stop lever 38 is
At about the same time as engaging 4 the contactor opens, thereby disconnecting the motor 27 from the circuit. After that, the electric motor 27 continues to idle for a while even after the circuit breaker stops moving due to inertial force, and then stops.

On the other hand, when the circuit breaker is pulled out, the drawer contactor is operated by operating the drawer operation switch, and the electric motor 27 is rotated in the direction opposite to that at the time of insertion. The breaker moves in the pulling direction.

Thus, at the beginning of the moving operation, the stop plate (circuit breaker) is released and the large sun gear is locked, and
At the end of the moving operation, the stop plate (circuit breaker) is restrained and the sun gear is released. These operations are performed for each operation regardless of the rotation direction of the stop plate (output shaft) and the sun gear.

In the above embodiment, one rod, one electromagnet, and one spring connected to the stop lever are used to restrain and release the rotations of the stop plate and the sun gear, respectively. Braking each of the stop plate and the sun gear by a brake shoe type braking device,
As well as having a structure for release control, as shown in FIG.
It is also possible to provide a rod 48A, an electromagnet 49A and a spring 50A on the locking lever 37 side so that each control of the stop plate and the sun gear can be performed by the respective rod, electromagnet and spring. In that case, it goes without saying that the brake shoe type braking devices do not operate simultaneously, but operate so as to brake only one of the stop plate and the sun gear.

In each of the above embodiments, the electric movement operating device is mounted on the moving equipment such as a circuit breaker, but the electric movement operating device may be mounted on the fixed side such as the opening / closing device. It is possible.

Further, the electric movement operation device of the present invention can be applied to a movement operation device between fixed positions of an electric device or a mechanical device other than the circuit breaker.

[0027]

As described above, according to the present invention, the small sun gear and the planetary gear that revolves around the small sun gear while revolving around the small sun gear and the planetary gear are provided between the motor serving as a drive source and the output shaft. Since a planetary gear speed reducer consisting of a large sun gear that rotates around the revolution axis is provided, and by constraining and releasing the large sun gear of this planetary gear speed reducer, the rotational force is transmitted to and blocked from the output shaft. The drive motor has high stopping accuracy not only when the rotational speed-rotational force characteristics fluctuate significantly due to fluctuations in the operating voltage, but also when the load and movement speed fluctuate. An operating device is obtained.

At the stop position, since the output shaft is constrained by the stop plate when the moving operation is completed, it is possible to maintain a stable stop position against an operation shock applied to the driven device after the stop and an external force such as an earthquake. You can

[Brief description of drawings]

FIG. 1 is a front view showing an electric movement operation device according to an embodiment of the present invention in a partial cross section.

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 a partial side view of an electric movement operation device according to another embodiment of the present invention.

FIG. 6 is an overall configuration diagram of a conventional electric movement operation device.

FIG. 7 is a sectional view of a conventional electric movement operation device.

[Explanation of symbols]

 14 planetary gear reducer 17 small sun gear 18 planetary gear 19 large sun gear 20 output shaft 23 female screw 24 fixing frame 25 screw rod 27 electric motor 31 concave groove 32 locking plate 33 stop plate 37 locking lever 38 stop lever

Claims (1)

[Claims] 1. A driving force of an electric motor, which is a drive source, is transmitted to an output section via a speed reducer equipped with a planetary gear speed reducer, and reversible control of the electric motor is performed to reciprocate electric equipment for a certain section. In the electric movement operating device of the electric device, the planetary gear reducer includes a small sun gear as a center, a planetary gear that revolves around the small sun gear and a revolution shaft of the planetary gear. It is composed of a large sun gear that rotates as a center, and a female screw is provided at one end of the output shaft with the revolution shaft of the planetary gear as an output shaft, and a male screw that engages with the female screw is provided on the fixed side, and An electric movement operating device for an electric device, comprising: a control means for controlling transmission and interruption of a driving force of an electric motor to the output shaft by restraining and releasing a large sun gear of the planetary gear reducer. ..