JPS5941291B2 - release type electromagnet device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a release type electromagnet device, in which a magnetic circuit is configured by a yoke 1 and a permanent magnet 2.
An output shaft 4 connected to the armature 3 and biased by a spring, and a coil 5 wound around the yoke 1. When the coil 5 is energized, the armature 3 is connected to the yoke 1. In a release type electromagnet device that is released by attraction, a large number of concave grooves T are formed across the entire width direction of the armature 3 in the attraction part 6 of the yoke 1 and the armature 3 that constitutes the magnetic circuit. The present invention relates to an open type electromagnet device characterized by:

In conventional release type electromagnetic devices, the yoke and armature are usually attracted by the magnetic flux of the permanent magnet, but since the surface of the armature at the attraction part of the yoke and armature is flat, dust There were problems such as poor suction due to dust, copper powder, etc., and magnetic instability.

The present invention has been provided in view of the above-mentioned points, and provides a release type electromagnet device aimed at stabilizing the adhesion between a yoke and an armature and improving quality.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In the figure, 1 is a substantially U-shaped yoke, and one piece of this yoke 1 is inserted into a coil block 8 around which a coil 5 is wound. Furthermore, a rectangular parallelepiped permanent magnet 2 is disposed on the central piece of the yoke 1. Reference numeral 3 denotes an armature, and the armature 3 is attracted to the end faces of both pieces of the yoke 1 by the magnetic flux of the permanent magnet 2, with the yoke 1 and the armature 3 forming a magnetic circuit.

Reference numeral 4 denotes an output shaft connected to the armature 3. A spring 10 is attached to the lower part 9 of the output shaft 4, and the output shaft 4 is disposed within the coil block 8 so as to be movable up and down.

Furthermore, an opening 11 is bored in the upper part of the output shaft 4,
A projecting piece 12 protruding from the end of the armature 3 is loosely fitted into this opening 11. Spring 1 attached to the output shaft 4
0 always urges the output shaft 4 upward. 13 is a case.

Next, the armature 3 will be explained in more detail. As shown in FIGS. 3 and 4, a large number of triangular grooves 7 are formed in the suction portion 6 between the yoke 1 and the armature 3, that is, on the protrusion 12 side of the armature 3. This groove T is the third
As shown in FIG. b, it is formed across the entire width in parallel to the same direction as the protruding direction of the protruding piece 12 of the armature 3, forming a so-called serration. The length of groove 7 is yoke 1
The length is slightly longer than the length of the end surface, which is the suction surface. Fourth
The figure shows a sectional view of the grooves 7, the grooves 7 are bored at predetermined intervals, and the upper surface between the grooves 7 is formed into a flat surface. For example, the pitch between grooves 7 is 0.4 mm, depth 0.1
mm〇However, Figure 1a shows a state where the coil 5 is not energized, and the yoke 1 and armature 3
is attracted by the magnetic flux of the permanent magnet 2 shown by the arrow in the figure.

The output shaft 4 connected to the armature 3 is urged downward against the return force of the spring 10. Next, when the coil 5 is energized as shown in Figure b, the permanent magnet 2
The armature 3 is released from the yoke 1 by the magnetic flux from the coil 5 in the opposite direction to the magnetic flux of the spring 1, and the output shaft 4 is
It protrudes in the direction of the arrow in the figure with a return force of 0. When the output shaft 4 is pressed in the direction of the arrow in FIG. 1C after the coil 5 is no longer energized, the armature 3 is attracted to the yoke 1 and returns to its initial state. As described above, in the present invention, a large number of concave grooves are formed across the entire width direction of the armature in the adhesion portion between the yoke and the yoke of the armature that constitutes the magnetic circuit. No matter where copper powder, etc. tries to adhere to the suction part of the armature, the grooves are provided across the entire width of the armature, so the dust will enter the grooves, and the suction characteristics between the armature and yoke will not be affected. , the magnetic resistance of the suction part increases, resulting in magnetic stability compared to conventional ones, eliminating the occurrence of suction failures due to sand, wood chips, copper powder, etc., improving magnetic stability, especially dust resistance, and opening/closing. The service life has also increased from the conventional 10,000 cycles to more than 100,000 cycles, resulting in a dramatic improvement in quality.

Furthermore, since a large number of concave grooves are formed in the suction part, the magnetic flux density per unit area between the yoke and the suction part increases, increasing the suction force, and the armature becomes weaker when the armature and yoke are attracted. With the force of the suction part, the dirt and dust adhering to the suction part are knocked down into the groove and below the yoke.
Dust etc. are swept away to stabilize the attraction, and in the case of a release type electromagnet that allows the armature to be attracted to the yoke as in the present application, the magnetic flux density increases and the attraction between the armature and the yoke is reduced due to an increase in the attraction force. It has a stabilizing effect.

[Brief explanation of the drawing]

1A to 1C are operation explanatory diagrams of the embodiment of the present invention, FIG. 2 is an exploded perspective view of the main parts of the same, FIGS. This is an enlarged cross-sectional view of the main parts of the groove in the armature shown above, where 1 is a yoke, 2 is a permanent magnet, and 3 is a yoke.
4 is an armature, 4 is an output shaft, 5 is a coil, 6 is a suction part, and 7 is a groove.

Claims (1)

[Claims] 1 It has a yoke, an armature that forms a magnetic circuit with a permanent magnet and is attracted to the yoke, an output shaft that is connected to the armature and is biased by a spring, and a coil that is wound around the yoke. In a release type electromagnet device that releases an armature from adsorption with a yoke by applying electricity, a large number of concave groove-like grooves are formed across the entire width direction of the armature in the adhesion portion of the armature and the yoke that constitute a magnetic circuit. A release type electromagnet device characterized by comprising: