JPH0477408B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electromagnetic pneumatic circuit breaker equipped with an overcurrent protection device for electric vehicles, and in particular improves the adjustment of a trip mechanism using rollers. Regarding electromagnetic pneumatic circuit breakers.

[Conventional technology]

In order to adjust the distance between the roller and the roller stand in the trip mechanism of conventional electromagnetic pneumatic circuit breakers, positioning is required in the case of a column support system as shown in Japanese Patent Publication No. 55-20623 and Japanese Patent Publication No. 59-53647. The solution was to adjust the roller height by inserting an adjustment plate between the sheaths and moving it upward and downward together with the lower arc horn equipped with a reset pin.

Also, in the case of the frame support method as shown in Japanese Patent Application Laid-Open No. 57-134822, the roller height is adjusted by moving up and down a stripper on a movable arm that has the same function as the lower arc horn and reset pin. Alternatively, this problem was dealt with by inserting an adjustment plate under the roller stand.

[Problem to be solved by the invention]

In the case of the conventional distance adjustment method, no consideration was given to the distance between the lower arc horn and the lower arc block in the arc extinguishing chamber, and due to variations in assembly work, the arc generated when the contact opens could be Since there is a possibility that something may come around to the rear of the arc block through the gap between the arc block and the lower arc block, the position of the arc block in the arc extinguishing chamber must be readjusted to match the body of each machine. There was a problem with the incompatibility.

In addition, in the case of an adjustment method that uses adjustment plates, the precision of parts and assembly of each circuit breaker differs, so the thickness and number of adjustment plates vary, making assembly and adjustment difficult.
There were problems such as difficulty in managing the adjustment plate. Furthermore, this method lacks consideration for maintenance work on the user's side, and when the user disassembles and reassembles during maintenance and inspection, it is difficult to make adjustments based on assembly accuracy and normal wear and tear of each part. There was a problem that there was a possibility that there would be an excess or shortage of plates, and that fine adjustment could not be made because adjustments were made using plates.

If the distance between the roller and the roller stand is too large, the impact during loading will accelerate the wear of the roller body or the roller stand, and in the worst case, it will cause serious problems such as breakage of the roller shaft that supports the roller, or vice versa. Even if it is too narrow, it can become clogged with debris, causing serious problems such as being unable to reset or trip.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetic pneumatic circuit breaker in which the distance between the roller of the trip mechanism and the roller stand can be easily adjusted.

[Means to solve the problem]

The above object is achieved by configuring the reset pin to be movable in the horizontal direction, and by forming the engagement portion of the movable arm with the reset pin at an angle with respect to the horizontal direction when the mount is lowered.

[Effect]

With the above configuration, by moving the reset pin in the horizontal direction, if the moving reset pin moves into the downward direction of the slope with respect to the slope of the movable arm, the movable arm moves upward around the pivot support. When the movable arm rotates in the direction and moves upward in the inclined direction, the movable arm rotates downward about the pivot support. By the rotation of the movable arm, the roller supported by the movable arm is displaced in the vertical direction, thereby making it possible to adjust the distance between the roller and the roller stand. As a result, there is no need to use an adjustment plate or to move the lower arc horn in the vertical direction, and the adjustment between the two positions can be made by simply moving the reset pin in the horizontal direction, which simplifies the work.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 is an enlarged detailed view of the trip mechanism according to the present invention, FIG. 2 is a side view of the circuit breaker using the present invention in the open state, FIG. 3 is a side view of the trip mechanism in the closed state, and FIG. 4 shows a side view showing the tripped state.

1 is an operating cylinder, 2 is a solenoid valve for supplying and exhausting air into the cylinder, 3 is a piston rod, 4 is an insulating joint,
5 is a mounting base that supports the adjustable parts, 6 is an arc block in the arc extinguishing chamber, 7 is a lower arc horn, 8 is an upper arc horn, 9 is located above the mounting base 5, and one end is attached to the mounting base 5. A movable arm is rotatably attached by a hinge pin 10; 11 is a movable contact attached to the movable arm 9; 12 is a fixed contact fixed to the upper arc horn 8; A blowing coil 14 is connected to the arc horn 8 and provides a magnetic flux to guide the arc generated when the contact is opened into the arc extinguishing chamber, and the upper end of the blowing coil 14 is rotatably attached to the movable arm 9 by a mounting plate hinge pin 15. A roller mounting plate is shown, with a roller shaft 16 rotatably supporting a roller 17 at the lower end of the roller mounting plate 14.

The roller 17 is placed on the horizontal engagement surface 18a of the roller stand 18 provided on the mounting stand 5 when the circuit is closed (the movable contact 11 is in contact with the fixed contact 12). The relationship between the roller shaft 16 and the mounting plate hinge pin 15 is such that the roller shaft 16 is slightly inclined in the vertical direction so that the tension force of the quick-cut spring 19 pushes the roller shaft 16 counterclockwise. The quick cutting spring 19 has one end connected to the movable arm 9 and the other end connected to an insulating substrate 27 which is one of the fixed members. 20 is a hinge pin for attaching the lever 21 to the mounting base 5, 22
is the release lever return spring. Roller shaft 16
The force that tries to move counterclockwise is the quick-cutting spring 19
With respect to the pulling force of
It is received at the vertical engagement surface 21a. 23 is a roller mounting plate return spring that always returns the roller mounting plate 14 to the vertical state. Reference numeral 24 denotes a reset pin, which is attached to the arc horn 7, and its attachment position is such that it is engaged with the movable arm 9 when the mounting base 5 is lowered and the movable contact 11 is separated from the fixed contact 12. This is the position where

FIG. 3 shows a state in which the movable contact 11 is in contact with the fixed contact 12, and its operation begins by exciting the solenoid valve 2 and feeding compressed air into the cylinder 1 of the piston device. The piston rod 3 is pushed up to raise the mounting base 5 against the quick-cut spring 19. This rise causes the mount hinge pin 1 to
The movable arm 9 supported by the movable arm 9 and the roller mounting plate 14 also rises, and the movable contact 11 attached to this movable arm 9 contacts the fixed contact 12. On the other hand, when the solenoid valve 2 is demagnetized and the compressed air in the cylinder 1 is discharged, the movable contact 11 is opened and separated by the fixed contact 12, as shown in FIG. 4, and the electric circuit is interrupted.

When an overcurrent flows through the circuit while the circuit breaker is closed as shown in FIG. 3, the overcurrent tripping electromagnet 25 attracts the armature air 26, pushes the tripping lever 21 in the direction of the arrow, and trips the lever hinge pin 20 as an axis. Lever 21 rotates counterclockwise. Due to this rotation, the engagement between the vertical engagement surface 21a of the lever 21 and the roller shaft 16 is released.
As shown in FIG. 4, the roller 17 rolls on the roller stand 18 due to the tensile force of the quick cutting spring 19.
The roller mounting plate 14 is rapidly attached to the mounting plate hinge pin 15.
Move counterclockwise around the axis. The movable arm 9, which is no longer supported by the roller mounting plate 14, tilts downward using the mounting base hinge pin 10 as a fulcrum, whereby the movable contact 11 is opened by the fixed contact and the electric circuit is rapidly interrupted.

After shutting off, the piston rod 3 is lowered by demagnetization of the solenoid valve 2, and the contact side end of the movable arm 9 is prevented from further lowering by the reset pin 24, and the mounting base 5 and the roller base 18 fixed thereto are
further lowers and returns to the open position as shown in FIG. At this time, the roller mounting plate 14 is pulled back clockwise by the roller mounting plate return spring 23.
The release lever 21 is rotated clockwise by the lever return spring 22 and returned to its original position.

In the recovery process after the above-mentioned overcurrent trip operation, in order to smoothly return the roller 17 to its original position, as shown in FIG. The distance G ₁ between the roller 17 and the roller stand 18 when the rollers 11 are separated is
The distance l ₁ from the center of the mounting plate hinge pin 15 to the end surface of the horizontal engagement surface 18a of the roller stand 18 and the roller 1
It is necessary to secure at least the difference from the distance l ₂ to the bottom of No. 7.

In other words, G ₁ > l ₁ - l ₂ , but if the gap G ₁ is extremely large, the collision force caused by the collision between the roller 17 and the roller stand 18 at the engagement surface will cause the roller 1 to
7. The roller 18 wears out more quickly, and furthermore, the roller shaft 16 and mounting plate hinge pin 15 may break. On the other hand, if G ₁ is brought too close to l ₁ - _{l 2} , there is a risk that the reset will not be possible due to the accumulation of a small amount of dust or the wear and tear of the reset pin 24, etc.
_〓G1 needs to be strictly managed and adjusted.

According to this embodiment, the engagement surface 9a of the movable arm 9 with the reset pin 24 when the mounting base 5 is lowered is formed to be inclined with respect to the horizontal direction, and the reset pin 24 is attached to the arc horn 7 below. The lower arcing horn 7 is supported movably in the same direction as the horizontal direction with respect to an insulating substrate 27 that covers the mounting base 5 and the surrounding trip mechanism parts from left and right sides. Therefore, by moving the lower arc horn 7 in the horizontal direction, the reset pin 24 also moves in the same direction, and as a result, the contact position of the engagement surface 9a with the reset pin 24 is displaced, and the movable arm 9 is moved to the mounting base hinge pin. The roller 17, which rotates vertically around the movable arm 9 and is supported via the mounting plate hinge pin 15, the roller mounting plate 14, and the roller shaft 16, moves up and down.
7 and the roller 18 can be _adjusted .

For example, if the reset pin 24 is horizontally moved in the direction of the arrow in _{FIG .} can be expanded to

In this embodiment, the reset pin is fixed to the lower arc horn and the lower arc horn and reset pin are moved horizontally together. However, it is also possible to move only the reset pin horizontally on the lower arc horn, or the reset pin may be moved horizontally on the lower arc horn. It may also be directly held from insulating substrates or metal plates placed on the left and right, and moved horizontally thereon.

In addition, by changing the inclination angle of the movable arm's engagement surface with the reset pin, the adjustment range can be selected, making it possible to increase the manufacturing tolerances of each part and absorb the accumulated tolerances using this adjustment method. .

Furthermore, since there is no need to move the lower arc horn upward or downward, the distance A between the arc horn and the lower arc block in the arc extinguishing chamber shown in Fig. 2 can be kept constant, and the lower arc horn can be moved downward. It is possible to prevent wraparound and supply products with stable performance.

〔Effect of the invention〕

According to the present invention, the adjustment plate can be eliminated and the distance between the roller and the roller stand can be adjusted steplessly and efficiently, which is advantageous in terms of workability and cost.Furthermore, adjustment can be made according to assembly tolerances during reassembly. Since there is no need to worry about excess or shortage of boards, maintenance on the user side becomes easier.

[Brief explanation of the drawing]

FIG. 1 is an enlarged detailed side view of the trip mechanism according to the present invention, FIG. 2 is a side view of the circuit breaker in the open state, and FIG. 3 is a side view of the trip mechanism in the closed state. , FIG. 4 is a side view showing the trip state. 5... Mounting base, 9... Movable arm, 9a... Engagement surface, 11... Movable contact, 12... Fixed contact,
14...Roller mounting plate, 17...Roller, 18...
...Roller stand, 24...Reset pin.

Claims (1)

[Claims] 1. A mounting base that is driven in the vertical direction, a movable arm that is located above the mounting base, has one end pivoted on the mounting base, and is constantly pressed downward, and a movable contact provided on this movable arm. a fixed contact mounted on a fixed member facing the movable contact; a roller mounting plate having an upper end pivoted on the movable arm and a roller mounted on the lower end; and a roller mounting plate mounted on the mounting base. In order to maintain a constant positional relationship between the movable arm and the mounting plate, there is a roller stand on which the roller is placed, and in normal times, the roller at the lower end of the roller mounting plate is held on the roller stand. a trip mechanism that releases the holding of the roller and tilts the movable arm when the flow is flowing; and a reset pin that engages with the movable arm and prevents the movable arm from lowering when the mounting base is lowered; In the electromagnetic pneumatic circuit breaker, the reset pin is configured to be movable in the horizontal direction, and the movable arm is configured to be movable in the horizontal direction, and the movable arm is configured to be movable in the horizontal direction. An electromagnetic pneumatic circuit breaker, characterized in that the engaging portion is formed to be inclined with respect to the horizontal direction.