JPH0230812Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure for extending the life of a bidirectional self-holding solenoid using permanent magnets. Conventionally, this type of solenoid has few long-life applications; rather, the base and plunger are directly opposed to each other in order to strengthen the self-retaining property, or the opposing part is made soft to soften the impact force between the base and the plunger. A magnetic buffer seat was provided. However, in the former case, since the plunger directly collides with the base, it is not appropriate to extend the service life in cases where high-speed switching is required. On the other hand, in the latter case, the soft magnetic buffer seat deforms due to fatigue from repeated collisions, and the holding force changes.
Again, extending the lifespan was inappropriate.

The purpose of this invention is to eliminate such drawbacks by inserting an elastic plastic space washer between the base and the plunger, and by coating the inner surface of the sleeve, which is the sliding surface of the plunger, with Teflon coating, the solenoid can operate stably and at high speeds. This is intended to extend the lifespan. Hereinafter, details of the present invention will be explained using the drawings.

FIG. 1 is a sectional view showing the structure of an embodiment of the present invention. In the figure, 1 is a magnetic case, 2 is a plate for holding the coil and forming a magnetic path, 3 is a base provided at both poles, 4 is a plunger inserted so as to be slidable, and 5 is a plunger. It is a shaft that penetrates and transmits force to the outside. 6 is a sleeve whose inner surface is treated with Teflon, and 7 is a bobbin around which a left coil 8 and a right coil 9 are respectively wound. 10 is a permanent magnet located in the center between both coils, 11
is an elastic plastic space washer.

The operation of this bidirectional self-holding solenoid is as follows: First, when pulse power is supplied to the left coil 8, a magnetic path of case 1-permanent magnet 10-plunger 4-left base 3-plate 2 is formed. It is attracted to the left base 3 against the gap between the left base 3 and the left base 3. Thereafter, even if the pulse power supply to the coil 8 is stopped, the permanent magnet 10 causes the plunger 4 to
continues to be held by suction to the left base 3. During this time, the load is maintained at the same position through the shaft 5. Next, when pulse power of opposite polarity is supplied to the right coil 9, a magnetic path is formed by the frame 1-right base 3-plunger 4-permanent magnet 10, and the plunger 4 is attracted to the right base 3 and slides to the right. . Even if the pulse is subsequently removed, the permanent magnet 10 continues to hold the same position, so the load is also held at that position.

Such operation is well known.

Therefore, the present invention uses an elastic plastic such as a 50 μm ethylene vinyl acetate copolymer resin for the gear push washer at the collision part between the plunger and the left and right bases 3, thereby stabilizing the holding force and extending the service life over 50 million times. was completed. The purpose of applying Teflon coating to the inner surface of the sleeve is to prevent wear due to sliding of the plunger.Furthermore, if the base is treated with Tuftride, the plunger is treated with Tuftride, and then coated with molybdenum disulfide, an even longer life can be achieved. There are advantages.

As is clear from the above description, the bidirectional self-holding solenoid according to the present invention is useful when a load that requires a relatively weak holding force of several tens of grams to several hundreds of grams is operated repeatedly at high frequency, for example, when a recorder pen is used. It can be used as a power-saving, compact, and long-life actuator in cases where vertical movements are performed frequently, and the practical effects are great.

[Brief explanation of drawings]

FIG. 1 is a structural diagram showing an embodiment of the present invention. In the figure, 1 is the magnetic case (frame), 2
is the plate, 3 is the base, 4 is the plunger, 5
is the shaft, 6 is the sleeve, 7 is the bobbin, 8, 9
10 is a coil, 10 is a magnet, and 11 is a gear washer.

Claims (1)

[Scope of utility model registration request] Inside the magnetic case, a permanent magnet and two sets of coils placed on both sides of the permanent magnet are fitted onto the outer periphery of a sliding tube (sleeve), and bases are fitted onto both ends of the sleeve, respectively. In a bidirectional self-retaining solenoid comprising a plunger inserted so as to be slidable between the bases, at least one side between the plunger and the base has a thickness of approximately
A bidirectional self-holding solenoid featuring a gear lock made of 50μm ethylene-vinyl acetate copolymer resin.