CN201207340Y - A permanent magnet mechanism manual opening device - Google Patents

Abstract

The utility model relates to a manual opening device of a permanent magnet mechanism, which comprises a transmission shaft arranged in the permanent magnet mechanism, and the lower end of the transmission shaft is provided with a brake opening booster spring with pre-pressure, and one end of the brake booster spring is connected to the The other end of the permanent magnet mechanism is arranged on the stopper provided at the bottom end of the transmission shaft, and a roller is arranged on the top of the transmission shaft, and a cam that forms a rolling contact with the roller is connected to the top of the roller by a hand split shaft. The two ends of the branch shaft are supported on two support plates, and a switch-off handle is fixedly connected to the protruding end of the front part of the hand branch shaft. Hanging spring pin, hanging spring pin stretches in the limit hole that is provided with on the described support plate, hangs a back-moving spring on the hanging spring pin, and the other end of back-moving spring is fixed on the described supporting plate by a hanging spring bolt. The utility model has stable and labor-saving movement, and is very safe and convenient when installed in a circuit breaker in a sealed box for use.

Description

A permanent magnet mechanism manual opening device

technical field

The utility model relates to a high and low voltage switch for power supply and distribution in a power system, in particular to an emergency manual opening device for a permanent magnet operating mechanism in a high and low voltage switch.

Background technique

In recent years, switches with permanent magnet operating mechanisms have been widely used in the field of power system distribution due to their advantages such as simple structure, few parts, long life, and frequent operation. In the traditional spring mechanism held by mechanical locks, the manual opening function is relatively easy to realize, while in the permanent magnet operating mechanism, because it uses electromagnetic operation and is held by permanent magnets, it is realized in the permanent magnet mechanism. Manual opening is more difficult. At present, most permanent magnet operating mechanisms adopt the method of mechanical cam force, and the kinematic pair is a sliding low pair, but these manual devices still have relatively large shortcomings and defects, mainly manifested in large frictional resistance and serious mechanical damage. .

Contents of the invention

In view of the above problems, the purpose of this utility model is to propose a permanent magnet mechanism manual opening device with small friction and small mechanical damage.

In order to achieve the above object, the utility model adopts the following technical solutions: a permanent magnet mechanism manual opening device, which includes a transmission shaft arranged in the permanent magnet mechanism, and is characterized in that: the lower end of the transmission shaft is provided with a A pre-pressed opening booster spring, one end of the opening booster spring is connected to the permanent magnet mechanism, and the other end is set on the stopper set at the bottom end of the transmission shaft, and a roller is arranged at the top end of the transmission shaft. A cam that forms a rolling contact with the roller is connected above the roller through a hand split shaft. The two ends of the hand split shaft are supported on two support plates, and the protruding end of the front part of the hand split shaft is fixedly connected. An opening handle, a reset crank arm is arranged at the rear end of the hand split shaft, and the reset crank arm is fixedly connected to a hanging spring pin through a nut, and the hanging spring pin extends into In the limiting hole, a return spring is hooked on the hanging spring pin, and the other end of the returning spring is fixed on the support plate by a hanging spring bolt.

The limiting hole is an annular long hole with the axis of the hand split shaft as the center, the distance from the axis of the hand split shaft to the axis of the hanging spring pin as the radius, and the diameter greater than the diameter of the hanging spring pin as the width. hole.

The roller is passed through a U-shaped opening at the top of the transmission shaft through a pin shaft, and the two ends are positioned with retaining rings.

Because the utility model adopts the above technical scheme, it has the following advantages: 1. Since the utility model is provided with a roller and a cam mechanism, the rolling friction of high secondary motion is formed between the cam and the roller, which reduces friction and mechanical damage. Improved quality of work. 2. Since the utility model is equipped with the opening handle, the operating arm is lengthened, which saves labor and improves the efficiency during operation. 3. Since the utility model is equipped with an opening booster spring, and a preload is added to the opening booster spring, the opening speed is improved. 4. Since the utility model is equipped with a return spring, after the opening operation is completed, the opening handle and the cam will automatically return to their positions. The utility model has the advantages of simple overall structure, stable movement, reliable action and wide application range, especially when it is installed in a circuit breaker in a sealed box for use, it is very safe and convenient.

Description of drawings

Fig. 1 is a structural representation of the utility model

Figure 2 is a schematic top view of Figure 1

Fig. 3 is a schematic diagram of the connection between the roller and the transmission shaft in the utility model

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in detail.

As shown in Figure 1, the utility model includes a transmission shaft 1 arranged in the permanent magnet mechanism of the prior art, a set of opening booster spring 2 arranged at the lower end of the transmission shaft 1, and one end of the opening booster spring 2 is fixed on the permanent magnet On the lower yoke 3 of the mechanism, the other end is limited by a stopper 4 fixed on the transmission shaft 1 . When the opening booster spring 2 is initially set, a preload is applied to the opening booster spring 2 . A roller 5 is arranged on the top of the transmission shaft 1, and a hand-point shaft 6 is arranged above the roller 5 in parallel with the axial direction of the roller 5, and the two ends of the hand-point shaft 6 are rotatably supported on two fixed support plates 7 (as shown in Figure 2 shown). An opening handle 8 is fixedly connected at the front part of the hand-pointing shaft 6, and a cam 9 contacting the roller 5 is fixedly connected at a position facing the roller 5 at the middle part of the hand-pointing shaft 6. The rear end of hand splitting shaft 6 is fixedly connected with a reset crank arm 10, and the extended end of reset crank arm 10 is fixedly connected with a hanging spring pin 11 by a nut, and the hanging spring pin 11 stretches into the limit that is provided with on the support plate 7. In the hole 12 (as shown in FIG. 1 ), the hanging spring pin 11 can move in the limiting hole 12 . A groove is arranged in the middle part of the hanging spring pin 11 , and a return spring 13 is hooked in the groove, and the other end of the returning spring 13 is connected on the support plate 7 by a hanging spring bolt 14 .

In the above embodiment, as shown in FIG. 3 , the roller 5 is passed through the U-shaped opening at the top of the transmission shaft 1 through a pin shaft 15 , and the two ends are positioned by retaining rings 16 .

In the above-mentioned embodiment, the limiting hole 12 is an annular long hole centered on the axis of the hand split shaft 9 and the distance between the axis of the hand split shaft 9 and the axis of the hanging spring pin 11 is the radius, and the hanging spring pin 11 slides set in the circular long hole.

When the utility model is applied to a box-type circuit breaker, the support plate 7 can be the side wall of the box body.

The working process of the utility model is as follows: when an emergency situation requires manual opening, the operator moves the opening handle 8 clockwise, and the opening handle 8 drives the rotation of the cam 9 through the rotation of the hand opening shaft 6, and presses down when the rotation of the cam 9 During the process, the roller 5 rotates and drives the transmission shaft 1 to move vertically downward; the moving iron core 17 fixedly connected to the transmission shaft 1 also moves downward together with the transmission shaft 1, and along with the moving iron core 17 and the upper yoke The air gap between 18 increases gradually, and the closing holding force of the permanent magnet decreases sharply, achieving the purpose of manual opening.

In the above operation process, since the opening booster spring 2 has a pre-pressure, the opening booster spring 2 has a boosting force during the downward movement of the transmission shaft 1, so that the permanent magnet mechanism can realize fast manual opening operation . Simultaneously, because when moving the opening handle 8 to carry out the opening operation, the reset arm 10 on the hand-off shaft 6 drives the hanging spring pin 11 to move along the limit hole 12, and the driven back-moving spring 13 stretches and stores energy, so when the opening Brake operation is finished, and when unclamping manual branching handle 8, the effect of back-moving spring 13 can make hand branching shaft 6 and cam 9 reset automatically.

Claims (3)

1. A permanent magnet mechanism manual opening device, which includes a transmission shaft arranged in the permanent magnet mechanism, characterized in that: the lower end of the transmission shaft is provided with a pre-pressured opening booster spring, the opening One end of the brake booster spring is connected to the permanent magnet mechanism, and the other end is set on the stopper set at the bottom end of the transmission shaft. A roller is arranged on the top end of the transmission shaft, and is connected by a hand split shaft above the roller. A cam forming a rolling contact with the roller, the two ends of the hand-off shaft are supported on two support plates, and an opening handle is fixedly connected to the protruding end of the front part of the hand-off shaft. The rear end is provided with a reset arm, and the reset arm is fixedly connected to a spring pin through a nut, and the spring pin extends into the limit hole provided on the support plate, and on the spring pin A return spring is hooked, and the other end of the return spring is fixed on the support plate by a hanging spring bolt. 2. A permanent magnet mechanism manual opening device as claimed in claim 1, characterized in that: the limit hole is centered on the axis of the hand opening shaft, from the axis of the hand opening shaft to the The distance between the axis of the hanging spring pin is the radius, and the diameter greater than the diameter of the hanging spring pin is an annular long hole with a width. 3. A permanent magnet mechanism manual opening device as claimed in claim 1 or 2, characterized in that: the roller is connected to the U-shaped opening on the top of the transmission shaft through a pin shaft, and the two ends are provided with stoppers. circle positioning.

Images