CN110556273A

CN110556273A - Main shaft limiting device

Info

Publication number: CN110556273A
Application number: CN201810546274.9A
Authority: CN
Inventors: 刘丰丰; 陈大江; 戴罡; 邢垒垒; 潘璇
Original assignee: Jiangsu Daquan Kai Kai Switch Co Ltd
Current assignee: Jiangsu Daquan Kai Kai Switch Co Ltd
Priority date: 2018-05-30
Filing date: 2018-05-30
Publication date: 2019-12-10
Also published as: WO2019227653A1

Abstract

The invention discloses a main shaft limiting device and belongs to the technical field of low-voltage electrical component equipment. The movable contact assembly comprises a movable contact assembly, a fixed contact assembly and a main shaft, and further comprises a limiting plate and a cantilever fixedly arranged on the main shaft, wherein the limiting plate freely rotates by taking a rotating shaft as an axis; when the brake is switched off, the first protrusion collides with the first abutting part, the second abutting part pulls the second protrusion of the cantilever under the pushing action of the first abutting part on the second abutting part, and the main shaft rebounds to be stopped. The main shaft limiting device is simple in structure, small in part number and small in occupied space. The limiting plate is realized by the aid of the self structure and the gravity principle of the limiting plate, impact resistance of the limiting plate is improved, rebound of the main shaft is effectively prevented, and short-time tolerance indexes of the frame type circuit breaker are further improved.

Description

Main shaft limiting device

Technical Field

The invention belongs to the technical field of low-voltage apparatus component equipment, and particularly relates to a main shaft limiting device of a low-voltage circuit breaker.

Background

The short-time tolerance index of the conventional frame-type circuit breaker is continuously improved, and under the condition that the volume of the circuit breaker is not changed, the contact pressure is increased, so that the method is a direct method. However, the method has the side effect that when the moving contact is opened, the force of the cantilever of the mechanism impacting the limiting shaft is increased, the rebound of the contact is intensified, and the opening distance is reduced. During the breaking test, the reduction of the opening distance is easy to cause the electric arc reignition, so that the breaking failure is caused.

The main shaft limit in the current market is realized by using the principle of inertia, has certain requirements on the rotating speed of the main shaft of the mechanism during the brake division, and has poor reliability. And after the limiting plate playing a key role is impacted for multiple times, the phenomena of faults such as the deflection, inflexible rotation, deformation of a rotating shaft of the limiting plate, blocking of a torsion spring and the like easily occur.

The application number is 201710149068.X discloses a rebounding device is prevented to circuit breaker moving contact, including circuit breaker body, the mechanism main shaft of setting on the circuit breaker body and prevent rebounding mechanism, the spacing axle setting of second is in the below of fixed axle, the rotor plate comprises hitting portion, stop part and mounting hole, the cross sectional shape of the outer profile face of stop part sets up to circular-arc structure to circular-arc profile structure reduces gradually from the lower extreme to the distance between upper end and the mounting hole centre of a circle, the rotor plate passes through the mounting hole and rotates and install on the fixed axle, the torsion spring cup joints on the fixed axle to two jibs of torsion spring are used in on spacing axle of second and rotor plate respectively. However, the rebound device is complex, a plurality of parts are needed to work in a combined mode, the rebound prevention effect is poor, and the limiting effect is affected.

A circuit breaker with automatic catch for preventing the rebound of a trip contact arm is disclosed in application No. 98122539. X.A device 101 for positioning a latch hook 89 in a cocked position with said two jaws 93 aligned for engagement with said stop 75. when said contact arm 27 reaches said tripped position, said latch hook 89 is rotated from said cocked position to said latched position with said jaws 93 engaged with said stop 75 to prevent the rebound of said contact arm 27 from said tripped position. In its embodiment the means 101 in the cocked position is a torsion spring 101. Page 6/6, third line of its description: as shown in fig. 4, a torsion spring 101 engaging the top of the contact arm 27 and a projection 99 on a latch hook angularly resets the latch hook to a cocked position in which the two jaws 93 are aligned for engagement with the stop 75. It can be seen that although this patent has realized the technological effect that prevents the main shaft and kick-backed, the motion of its limiting plate needs to be realized with the help of torsion spring, and the device is complicated and prevents that the rebound effect is not good, influences spacing effect.

The transmission chain of the movable contact of the power circuit breaker, application number 018019403.6, is formed by attaching a stop (32 a; 32 b; 42) to the locking element (13; 31), on which the locking element 10 is guided during opening and which remains in its position of rest relative to the connecting element until a predetermined position of the connecting element 3 is reached. Its specification 4/6 line 25: the locking element is supported by the force of a return spring 18 by means of a stop surface 19 on a pin 20 which passes through the connecting element; description 5/6 line 25: according to fig. 5 to 7, the arresting member associated with the arresting member 31 is designed as a hairpin-shaped belleville spring, the coil of which is wound around the first coupling pin 33; description 6/6 line 10: according to fig. 8 to 10, a further embodiment of the detent element is designed as a rigid component 42 with a guide pin channel 41, which is fastened to the coupling section 5 of the drive chain. It can be seen that although the technical effect of preventing the main shaft from rebounding is achieved, the movement of the limiting plate needs to be achieved by means of the belleville spring, the device is complex, the rebounding prevention effect is not good, and the limiting effect is affected.

Disclosure of Invention

The invention aims to provide a main shaft limiting device which is simple and convenient and works stably.

Specifically, the invention is realized by adopting the following technical scheme: including movable contact subassembly, static contact subassembly and main shaft, still include the limiting plate and fixedly set up in main epaxial cantilever, the limiting plate uses the rotation axis as the axle center free rotation, is provided with first butt portion and second butt portion on the limiting plate, with second butt portion matched with be provided with the second arch at the lower extreme of cantilever, be equipped with first arch in the upper end of cantilever.

Further, when the switching-on/off structure moves from the switching-on state to the switching-off state, the first protrusion collides with the first abutting part, the second abutting part pulls the second protrusion of the cantilever under the pushing action of the first abutting part on the second abutting part, and the rebounding of the spindle is stopped.

It will be appreciated that the arm on the spindle is fixed to the spindle and rotates with the rotation of the spindle.

Further, the second abutting portion has a hook shape with a groove.

Further, the rotation shaft is a rivet shaft.

Furthermore, the main shaft is provided with a baffle plate and a limiting shaft matched with the baffle plate, and during brake opening, the lower end of the baffle plate is blocked by the limiting shaft, so that the final position of the main shaft is limited finally.

It can be understood that the lower end of the baffle is blocked by the limiting shaft when the brake is opened, so that the main shaft is fixed at one position when the brake is opened.

Furthermore, the device also comprises a supporting plate, wherein one end of the supporting plate is sleeved on the limiting shaft, and the other end of the supporting plate is sleeved on the rotating shaft.

It can be understood that the arrangement of the supporting plate increases the structural strength and plays a role in protection.

Further, both ends of the support plate are fixed by split collars.

The invention has the following beneficial effects: the main shaft limiting device is simple in structure, small in part number and small in occupied space. The limiting plate is realized by the aid of the self structure and the gravity principle of the limiting plate, impact resistance of the limiting plate is improved, rebound of the main shaft is effectively prevented, and short-time tolerance indexes of the frame type circuit breaker are further improved.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a side view of the present invention.

Fig. 3 is a schematic diagram of the working state of the closing device of the present invention.

Fig. 4 is a schematic view of the operation state of the opening device of the present invention.

FIG. 5 is an enlarged view of the collision between the cantilever and the upper end of the limiting plate according to the present invention.

FIG. 6 is an enlarged view of the collision between the cantilever and the lower end of the limiting plate according to the present invention.

Reference numerals in the drawings: 1-a movable contact assembly, 2-a fixed contact assembly, 3-a main shaft, 4-a side plate, 5-a limiting plate, 6-a connecting rod, 7-a cantilever, 8-a baffle, 9-a riveting shaft, 10-a first abutting part, 11-a second abutting part, 12-a limiting shaft, 13-a supporting plate and 14-a first bulge; 15-second projection.

Detailed Description

The present invention will be described in further detail with reference to the following examples and the accompanying drawings.

example 1:

The main shaft limiting device of the present embodiment is applied to the opening and closing structure shown in fig. 1. The opening and closing structure comprises a static contact component 2, a moving contact component 1 and a main shaft 3. The main shaft 3 is supported and positioned by two side plates 4, and the main shaft 3 can rotate. The main shaft 3 is fixedly provided with a connecting rod 6, the connecting rod 6 is hinged with the movable contact component 1, the movable contact component 1 is linked along with the forward and reverse rotation of the main shaft 3, and then the contact or separation between a movable contact in the movable contact component 1 and a fixed contact in the fixed contact component 2 is realized, namely the opening and closing action is realized. The switching-on and switching-off structure realizes the switching-on state and the switching-off state between the static contact component 2 and the moving contact component 1 through the connecting rod 6, which are respectively shown in fig. 3 and fig. 4. It should be noted that the main shaft limiting device of the present invention is not limited to be applied to the switching-on/off structure shown in fig. 1, and may also be applied to any other occasions where the same function needs to be achieved, and the structures of the fixed contact assembly and the movable contact assembly therein may also be in any other forms that do not affect the implementation of the function of the present invention.

The main shaft limiting device of the embodiment comprises a cantilever 7 fixedly arranged on the main shaft 3 and a limiting plate 5 matched with the cantilever 7 to realize the function of preventing the main shaft 3 from rebounding, and the specific structure is shown in fig. 1, 5 and 6. The limiting plate 5 can use the rotation axis as the axle center and freely rotate, and this embodiment is provided with first butt portion 10 in the upper end of limiting plate 5, is provided with second butt portion 11 at the lower extreme of limiting plate 5, and second butt portion 11 is the couple shape of taking the recess, and with this recess matched with be provided with second arch 15 at the lower extreme of cantilever 7, is equipped with first arch 14 at the upper end of cantilever 7. When the divide-shut brake structure from closing the state to the state motion of separating the floodgate, main shaft 3 rotates and drives the linkage of cantilever 7, the first butt portion 10 collision of the first arch 14 of cantilever 7 and the 5 upper ends of limiting plate, through the impetus of first butt portion 10 to second butt portion 11, realize that cantilever 7 and limiting plate 5 are rotatory towards relative expectation direction, cause the protruding 15 of second of cantilever 7 from with the recess phase separation state gradual movement of limiting plate 5 to this recess in, cantilever 7 is withheld to the couple part of the second butt portion 11 of limiting plate 5, main shaft 3 kick-backs and is stopped. The hanging hook part of the second abutting part 11 of the limiting plate 5 only pulls the cantilever 7 for a short time, due to the gravity, the hanging hook part at the lower end of the limiting plate 5 restores the position shown in fig. 5 below the rotary shaft, and the limiting plate 5 returns to the initial state to wait for the next switching-on and switching-off structure to move from the switching-on state to the switching-off state.

It should be noted that, in the present embodiment, there is no particular limitation on the arrangement manner of the rotating shaft on the limiting plate 5, and the rotating shaft itself may be fixed on the side plate, and the limiting plate 5 engaged therewith may be movably sleeved on the rotating shaft, or the rotating shaft may be only positioned and supported by the side plate, and may rotate itself, and the limiting plate 5 engaged therewith may be fixed on the rotating shaft. In this embodiment, the rotation shaft is preferably fixed to the side plate, and is further preferably fixed by riveting, i.e., a riveting shaft 9 as shown in fig. 5 and 6. The limiting plate 5 is provided with a hole, and the limiting plate 5 is sleeved on the riveting shaft 9 through the hole and can flexibly rotate.

In order to determine the final position of the main shaft in the opening state, the embodiment is further provided with a baffle plate 8 and a limit shaft 12 matched with the baffle plate 8 as shown in fig. 2. When the brake is switched off, after the cantilever 7 is pulled by the hook part of the limiting plate 5, the cantilever 7 slowly rotates along with the main shaft until the lower end of the baffle 8 fixed on the main shaft is blocked by the limiting shaft 12, so that the main shaft 3 is prevented from further rotating, and the position of the main shaft 3 is finally limited. The above object can be achieved by fixing one end of the stopper shaft 12 to the side plate 4, but as a preferable structure, in the present embodiment, one end of the stopper shaft 12 is fixed to one side plate 4, and the other end is fixed to the other side plate 4, so that the left and right side plates 4 are connected by the stopper shaft 12.

In order to further increase the structural strength, the present embodiment is further provided with a support plate 13 as shown in fig. 1, 3, 4. The limiting shaft 12 provides support for the supporting plate 13, one end of the supporting plate 13 is sleeved on the limiting shaft 12, the other end of the supporting plate 13 is sleeved on the riveting shaft 9, and two ends of the supporting plate 13 are fixed by split collars. The riveting shaft 9 is easy to bend due to the large stress of the limiting plate 5 in the working process. The two ends of the riveting shaft 9 are fixed through the side plate 4 and the supporting plate 13 through the supporting plate 13, so that the stability is enhanced; meanwhile, the supporting plate 13 plays a role in protection, so that the limiting plate 5 is located in a relatively closed area, and other parts are prevented from being influenced in the rotating process of the limiting plate 5.

The motion principle of the invention is as follows:

Step 1, as shown in fig. 5, when the rotating shaft rapidly rotates from the closing position to the opening position, the upper end of the cantilever 7 impacts a first impact point at the upper end of the limit plate 12;

And 2, as shown in fig. 6, the limiting plate rotates to the position shown in the figure, the main shaft starts to rebound, the lower end of the cantilever 7 impacts a second impact point at the lower end of the limiting plate 12, the lower end of the limiting plate 12 pulls the cantilever 7, and the rebound of the main shaft 3 is stopped.

Although the present invention has been described in terms of the preferred embodiment, it is not intended that the invention be limited to the embodiment. Any equivalent changes or modifications made without departing from the spirit and scope of the present invention also belong to the protection scope of the present invention. The scope of the invention should therefore be determined with reference to the appended claims.

Claims

1. The utility model provides a main shaft stop device, includes movable contact subassembly (1), static contact subassembly (2) and main shaft (3), its characterized in that: still include limiting plate (5) and fixed cantilever (7) that set up on main shaft (3), limiting plate (5) use the rotation axis as axle center free rotation, are provided with first butt portion (10) and second butt portion (11) on limiting plate (5), with second butt portion (11) matched with is provided with second arch (15) at the lower extreme of cantilever (7), is equipped with first arch (14) in the upper end of cantilever (7).

2. The spindle stop device of claim 1, wherein: when the switching-on and switching-off structure moves from a switching-on state to a switching-off state, the first protrusion (14) collides with the first abutting part (10), the second abutting part (11) pulls the second protrusion (15) of the cantilever (7) through the pushing effect of the first abutting part (10) on the second abutting part (11), and the rebound of the main shaft (3) is stopped.

3. The spindle stop device of claim 1, wherein: the second abutting portion (11) is in a hook shape with a groove.

4. The spindle stop device of claim 1, wherein: the rotating shaft is a riveting shaft (9).

5. The spindle stop device of claim 1, wherein: the main shaft (3) is provided with a baffle (8) and further comprises a limiting shaft (12) matched with the baffle (8), and during brake opening, the lower end of the baffle (8) is blocked by the limiting shaft (12), so that the position of the main shaft (3) is limited finally.

6. The spindle stop device of claim 1, wherein: the device is characterized by further comprising a supporting plate (3), wherein one end of the supporting plate (13) is sleeved on the limiting shaft (12), and the other end of the supporting plate is sleeved on the rotating shaft.

7. The spindle stop device of claim 6, wherein: and two ends of the supporting plate (13) are fixed by split collars.