JPH057843B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides an electromagnetic lock device that sets a lock bar in a locked state by an external force and then releases the locked state by energizing an electric winding. Regarding.

[Conventional technology]

Conventionally, an electromagnetic locking device has a yoke 1, a fixed core 2 fixed to the yoke 1, an electric winding 3 wound around the fixed core 2, as shown in FIGS. 2a and 2b.
First magnetic flux 4 induced by energizing the electric winding 3
The movable core 5 moves toward and away from the fixed core 2 by
Then, the locking rod 7 is pressed by an external force and inserted into the locking hole 6 to become locked, and when the movable core 5 moves, it comes out of the hole 6 and is released from the locked state. It consists of a spring 9 that biases the rod 7 in a direction opposite to the direction 8 in which it is pressed by an external force.

2a indicates a released state, in which the locking rod 7 is pushed and moved in the pushing direction 8 against the spring 9 by manual operation.

Next, as shown in FIG. 2b, with the locking rod 7 inserted into the block hole 6, the movable iron core 5, which is biased by the spring 5a,
is inserted into the lock state.

In this state, a first magnetic flux 4 as shown in FIG. 2b is induced by energizing the electric winding 3.

As a result, the movable iron core 5 resists the spring 5a.
comes out of the groove 7a of the lock 7, and further, the locking rod 7 moves in the opposite direction to the pressing direction 8 due to the biasing force of the spring 9, comes out of the hole 6, and enters the released state shown in FIG. 2a. Come back again.

[Problem that the invention seeks to solve]

However, in the conventional device described above, the gap 10 between the solid core 2 and the movable core 5 is large, and the frictional force between the groove 7a of the locking rod 7 and the movable core 5 is large, so that it is difficult to obtain the required release of the locked state. Requires large excitation ampere turns.

Furthermore, since the excitation ampere turns are large, the external dimensions of the device are largely overlapped, and the power supply capacity and electric line are also large, making it expensive.

SUMMARY OF THE INVENTION The present invention was proposed to solve the above-mentioned problems, and it is an object of the present invention to provide a small, lightweight, and inexpensive electromagnetic locking device that is locked by manual operation and released by a minute excitation ampere turn. With the goal.

[Means for solving problems]

The present invention includes a yoke, a fixed core fixed to the yoke, an electric winding wound around the fixed core,
The movable core moves toward and away from the fixed core due to the first magnetic flux induced by energizing the electric winding, and the movable core is pressed by an external force and inserted into the locking hole to be in a locked state. An improvement to an electromagnetic locking device comprising a locking rod that is moved out of the hole and released from the locked state, and a spring that biases the locking rod in a direction opposite to the direction in which it is pressed by the external force. The locking rod and one end of the movable iron core are connected in series in the moving direction of the locking rod, and the other end of the movable iron core is connected in a direction perpendicular to the movable iron core such that the periphery of the locking rod is connected for a minute while in the locked state. The pressing flat magnetic body is disposed opposite to the inner end surface of the yoke through the yoke, and a permanent magnet is provided that generates a second magnetic flux in parallel to the first magnetic flux. The locked state is held by the second magnetic flux, and the second magnetic flux is canceled by the first magnetic flux to release the locked state, and the magnetic path through which the second magnetic flux passes is magnetic. This is an electromagnetic locking device characterized by forming an almost completely closed magnetic path through the body.

[Effect]

According to the present invention, the locking rod and one end of the movable iron core are connected in series in the moving direction of the locking rod, and the peripheral edge is connected to the other end of the movable iron core through a slight gap when the movable iron core is in a locked state in a direction perpendicular to the locking rod. A pressing flat magnetic body is provided facing the inner end face of the yoke, and a second magnetic flux is inserted in parallel to the first magnetic flux induced by energizing the electric winding, thereby resisting the biasing force of the spring. A permanent magnet is inserted which holds the locked state with this second magnetic flux and releases the locked state with the first magnetic flux induced to cancel the second magnetic flux.

For this reason, there is no need to remove the movable iron core from the lock-chain groove to release the locked state, so there is no need for a large excitation pair turn caused by frictional force.

Further, if the electric winding is energized while the movable iron core is removed from the groove of the locking rod, a large excitation turn is required, but the present invention cancels the second magnetic flux induced by the permanent magnet by pulsed energization. Since it is sufficient to instantaneously induce the first magnetic flux by the electric winding, a large excitation pair turn is not required.

Furthermore, the first
Since the magnetic path through which the magnetic flux passes is formed by the magnetic material as a nearly completely closed magnetic path except for a small gap, it becomes open with a small excitation ampere turn.

In addition, since the present invention has a flat magnetic body for pressing as described above, the peripheral edge of the flat magnetic body and the machined surface of the fixed core facing it do not need precision finishing and may be finished by ordinary polishing. Therefore,
The production cost is low and it is suitable for mass production.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments with reference to the drawings.

Figures 1a, b, and c are cross-sectional views of an embodiment of the present invention.

Although the configuration is common to the conventional device shown in FIGS. 2a and 2b, the following points are different.

The locking rod 7 and one end of the movable iron core 5 are connected in series in the direction of movement of the locking rod 7, and the other end of the movable iron core 5 is connected in a direction perpendicular to the movable iron core 5 so that when the lock is in the locked state, the periphery is slightly A pressing flat magnetic body 5b is provided opposite to the inner end surface of the yoke 1 through the yoke 1.

Further, a permanent magnet 12 is inserted so as to insert a second magnetic flux 11 in parallel to the first magnetic flux 4 shown in FIG. 1c.

The path through which the second magnetic flux 11 passes is a yoke 1 made of a magnetic material, a fixed core 2, a movable core 5, and a movable core 5.
An almost complete closed magnetic path is formed by the pressing flat magnetic body 5b.

In the released state shown in FIG. 1a, the permanent magnet 12
Only the second magnetic flux 11 is flowing.

Next, when the pressing flat magnetic body 5b of the movable iron core 5 is pressed in the pressing direction 8 by manual operation in the state shown in FIG. 1a, the locking rod 7 is inserted into the clock hole 6 and is The lock state is reached as shown in .

This locked state is maintained by the second magnetic flux 11 against the urging force of the spring 9.

Next, as shown in FIG. 1c, the second magnetic flux 1
The locked state is released by the first magnetic flux 4 induced by the electric winding 3 which carries out pulse-like energization so as to counteract and cancel out the current, and the state shown in FIG. 1a is restored.

Conversely, it is also clear that when the movable core is in the released state, a current in the direction opposite to the unlocking of the movable core can be applied to the electric winding to electrically attract the movable core and operate the movable core into the locked state.

〔Effect of the invention〕

As explained above, the present invention has the effect that the locked state is released by a minute excitation ampere turn, and furthermore, since the pressing plate-shaped magnetic body is constructed, it is small and lightweight and can be mass-produced at low cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the present invention, and FIG. 2 is a sectional view of a conventional device. DESCRIPTION OF SYMBOLS 1... Yoke, 2... Fixed core, 3... Electric winding, 4... First magnetic flux, 5... Movable core, 6...
Hole portion, 5b... flat magnetic material for pressing, 7... locking rod, 8... pressing direction, 9... spring, 11...
...Second magnetic flux, 12...Permanent magnet.

Claims (1)

[Scope of Claims] 1. A yoke, a fixed iron core fixed to the yoke, an electric winding wound around the fixed iron core, and a first magnetic flux induced by energizing the electric winding to fix the fixed iron core. A movable core that moves toward and away from the core, and a lock that is pressed by an external force and inserted into a locking hole to become locked, and the movable core moves to come out of the hole and release the locked state. In an electromagnetic locking device comprising a rod and a spring that biases the locking rod in a direction opposite to the direction in which the locking rod is pressed by the external force, one end of the locking rod and the movable iron core is moved in the direction of movement of the locking rod. The pressing plate-shaped magnetic body is connected in series and is disposed at the other end of the movable iron core in a direction perpendicular to the movable iron core, the peripheral edge of which is positioned opposite to the inner end surface of the yoke with a slight gap therebetween when the movable iron core is in the locked state. A permanent magnet is provided that generates a second magnetic flux in parallel to the first magnetic flux, and the locked state is maintained by the second magnetic flux against the biasing force of the spring, and the lock state is maintained by the second magnetic flux. An electromagnetic locking device characterized in that the second magnetic flux is canceled to release the locked state, and a magnetic path through which the second magnetic flux passes is formed by a magnetic material into an almost completely closed magnetic path.