JPH07151203A - Operation device for switching device - Google Patents

Abstract

PURPOSE:To make quick deceleration by a simple device without making the device large and stop the movement of an operation device for a switching device by rotational force from an output shaft side. CONSTITUTION:An output shaft 22 formed in projected shaped and supported by a frame 21 for turning is mounted in an operation device for a switchgear. A cylinder 4 disposed lead grooves 5, 5D which are asymmetry and also have a lead angle respectively on the circumference symmetrical surface and attached for moving up and down to the frame 21 and the output shaft 22 is mounted. Rollers 3, 3C attached for turning to both ends parts at a lower end of the output shaft 22 and fit to the lead grooves 5, 5D of the cylinder 4 respectively are mounted. An input screw bar 8 screwed into the cylinder 4 and turned by a motor 11 is mounted in the device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating mechanism used for a switchgear or the like.

[0002]

2. Description of the Related Art Generally, an operating mechanism having a speed reducer composed of meshing gears is required to achieve high speed reduction, and therefore gears having a large difference in the number of teeth are combined.

2A and 2B show an example of such a conventional operating mechanism for a switchgear, in which FIG. 2A is a plan view and FIG. 2B is a front view. In the figure, a large gear 13 having a rotation stop hole 21 is fixed to an output shaft 2 rotatably supported by a frame 1. The large gear 13 meshes with a small gear 14 fixed to an input shaft 15 rotatably supported by the frame 1. The input shaft 15 is connected to the output shaft of the speed reducer 16 via a coupling 22, and the speed reducer 16 is directly connected to the electric motor 11. The L-shaped lever 17 operates with a lever pin 16 fixedly supported by the frame 1 as a fulcrum, and one end thereof is connected to a solenoid 24 fixed to the frame 1 via a plunger 23 and a spring 20.

In the above operating mechanism, the L-shaped lever 17 is normally used, that is, when the opening / closing operation of the switch is not performed.
By fitting one end of the large gear 13 into the rotation stop hole 21 of the large gear 13, the large gear 13 is locked so that the input shaft 15 does not rotate even if a rotational force is applied from the output shaft 2 side. When the opening / closing operation of the opening / closing device is performed, the solenoid 24 is excited by an electric command, the spring 20 is compressed, the plunger 23 is attracted, and the L-shaped lever 17 is used as a fulcrum to stop the large gear 13. It is pulled out from the hole 21 and the lock of the large gear 13 is released. When the electric motor 11 rotates, the rotational force reduced by the reducer 16 is transmitted to the small gear 14 fixed to the input shaft 15 via the coupling 22, and the small gear 14 meshes with the large gear 13 to further reduce the speed. Then, the rotational force is transmitted to the output shaft 2.

[0005]

However, in this conventional operating mechanism for a switchgear, the number of teeth is increased in order to achieve high deceleration and prevent the operating mechanism from moving due to the rotational force from the output shaft 2 side. Since a combination of the small gear 14 and the large gear 13 having a large difference and a lock mechanism that prevents the output shaft 2 from rotating even if a rotational force is applied, the operation mechanism becomes large and complicated. . Therefore, the present invention provides high deceleration with a simple mechanism and prevents the operating mechanism for the opening / closing device from moving due to the rotational force from the output shaft side without increasing the size.

[0006]

In the operating mechanism for an opening / closing device of the present invention, an output shaft formed in a convex shape and rotatably held by a frame is provided. Asymmetric in the plane of circumferential symmetry,
Further, there is provided a cylinder having lead grooves each having a lead angle and attached to the frame and the output shaft so as to be vertically movable. Rollers that are rotatably attached to both ends of the lower end of the output shaft and that fit into the lead grooves of the cylinder are provided. An input screw rod is provided which is screwed into the cylinder and rotated by an electric motor.

[0007]

In the operating mechanism for the opening / closing device of the present invention, the cylinder is moved upward or downward by the rotation of the input screw rod by the electric motor, whereby the output shaft is rotated via the roller fitted in the lead groove of the cylinder. Therefore, a large reduction ratio can be obtained, and high deceleration is possible. Further, even if a rotational force is applied from the output shaft side, the output shaft does not rotate because the roller is fitted in the cylindrical lead groove that does not rotate.

[0008]

FIG. 1 shows an embodiment of an operating mechanism for a switchgear according to the present invention. (A) is a front view and (B) is a plane viewed from the direction of arrow AA in (A). Figure, (C) is (B)
6 is a partial cross-sectional view as seen from the direction of arrow BB in FIG. In the figure, the output shaft 22 formed in a convex shape is rotatably held by the frame 21. The frame 21 has a sliding groove 10 in the vertical direction.
Are formed, and pins 9 and 9E are attached to the outer peripheral surface of the cylinder 4, and the pins 9 and 9E engage with the sliding groove 10 so that the cylinder 4 can move only in the vertical direction. It is attached to the output shaft 22 via. Further, in the cylinder 4, lead grooves 5 and 5D which are asymmetric and have respective lead angles are formed on a circumferentially symmetric surface. The rollers 3 and 3C are rotatably held at both ends of the lower end of the output shaft 22, and the rollers 3 and 3C are fitted into the lead grooves 5 and 5D of the cylinder 4, respectively. The electric motor 11 is fixed to the frame 21, and the electric motor 1
One end of an input screw rod 8 is connected to 1. Input screw rod 8
The other end of is screwed into a female screw portion formed on the lower lid 7 of the cylinder 4.

Next, the operation of the above-mentioned operating mechanism of the present invention will be described. In normal times, that is, when the opening / closing operation of the opening / closing device is not performed, even if a rotational force is applied from the output shaft 22 side, the rollers 3 and 3C are fitted into the lead grooves 5 and 5D of the cylinder 4, respectively, and the pin 9 of the cylinder 4 is inserted. , 9E engages with the sliding groove 10 of the frame 21 and the cylinder 4 does not rotate.
Does not rotate. FIG. 1 (A) shows the state of the operating mechanism when the switch is in the closed state. When performing the open operation, the input screw rod 8 is rotated by the electric motor 11.
The rotational force of the input screw rod 8 is transmitted to the cylinder 4 via the lower lid 7, but the pins 9 and 9E of the cylinder 4 are engaged with the sliding groove 10 of the frame 21. Without rotating
Move up. At this time, the rollers 3, 3 of the output shaft 22
C moves while rotating in the lead grooves 5 and 5D of the cylinder 4. As a result, the output shaft 22 rotates counterclockwise and the switchgear is opened. The state in the middle of this circuit opening operation is shown in FIG. On the other hand, when the closing operation is performed, the input screw rod 8 is rotated by the electric motor 11 in the direction opposite to the opening operation, whereby the cylinder 4 is moved downward, and the output shaft is completely opposite to the opening operation. 22 is rotated clockwise.

[0010]

According to the present invention, the cylinder 4 is moved upward or downward by the rotation of the input screw rod by the electric motor,
This allows the output shaft to rotate via the roller that fits in the cylindrical lead groove, resulting in a large reduction ratio and high deceleration, thus eliminating the need for a combination of small gears and large gears with large tooth differences. become. Further, even if a rotational force is applied from the output shaft side, since the roller is fitted in the cylindrical lead groove that does not rotate, the output shaft does not rotate, and the lock device is not required.

[Brief description of drawings]

FIG. 1 shows an embodiment of an operating mechanism of the present invention,
(A) is a front view, (B) is a plan view seen from the direction of arrow AA in (A), (C) is a partial cross-sectional view seen from the direction of arrow BB in (B), (D). ) Is a front view showing the middle of the opening operation.

FIG. 2 shows an example of a conventional operating mechanism for a switchgear,
(A) is a front view and (B) is a plan view.

[Explanation of symbols]

 3 Roller 3C Roller 4 Cylindrical 5 Lead Groove 5D Lead Groove 6 Upper Lid 7 Lower Lid 8 Input Screw Rod 9 Pin 9E Pin 10 Sliding Groove 11 Electric Motor 21 Frame 22 Output Shaft

Claims (1)

[Claims] 1. A frame, an output shaft which is formed in a convex shape and is rotatably held by the frame, and lead grooves which are asymmetric and each have a lead angle are formed on a circumferential symmetry plane, A cylinder movably attached to the frame and the output shaft in a vertical direction, and rollers rotatably attached to both ends of the lower end of the output shaft and fitted in the lead grooves of the cylinder, respectively. An operating mechanism for a switchgear, comprising: an input screw rod screwed into the cylinder and rotated by an electric motor.