JPS6314404Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an electromagnetic plunger that reciprocates the plunger in the axial direction by supplying current to the operating and return coils separately, and is particularly capable of driving a large load with a relatively small driving force. This relates to an electromagnetic plunger.

In a conventional electromagnetic plunger equipped with an operating coil and a return coil, a load is directly connected to the plunger, and when current is supplied to the coil, the driving force generated in the electromagnetic plunger is immediately transmitted directly to the load. Therefore, the electromagnetic plunger requires a large driving force to directly move the load connected thereto from its resting state, and the larger the load, the larger the electromagnetic plunger.

This invention solves this conventional problem by creating a structure that can transmit kinetic energy due to the no-load movement of the movable iron core to the operating rod of the plunger, making it possible to drive a large load with a relatively small driving force. . First, the configuration of a conventionally used electromagnetic plunger will be explained based on FIG.

An opening 12 is formed around the center of the bottom surface of the cylindrical magnetic yoke 11 with one end open, relative to the open surface. A fixed receiver 13 having a substantially cylindrical fixed end with a diameter slightly smaller than the diameter of the opening 12 is inserted into this opening 12, and the periphery of the end is bent outward, and the fixed receiver 13 is magnetically It is reliably fixed to the yoke 11.

A hole 14 is formed around the center of the fixed receiver 13,
A non-magnetic operating rod 15 having an outer diameter slightly smaller than the inner diameter of the hole 14 is movably inserted into the hole 14 . This operating rod 15 has a substantially cylindrical movable iron core 1.
6 is coaxially fixedly attached thereto.

The open side of the magnetic yoke 11 is closed with a side plate 11a, and an opening 1 having the same diameter as the opening 12 is formed in the side plate 11a.
2a is formed. Fixed receiver 13a is magnetic yoke 1
It is attached to this side plate 11a in the same way as the fixing receiver 13 on the bottom side of No. 1. Fixed receiver 13, 13
V-shaped concave surfaces 18 and 18a are formed on the end surface of the shaft a on the side corresponding to the movable iron core 16, respectively.
Correspondingly, V
Letter-shaped convex surfaces 19 and 19a are formed, respectively. When the respective concave and convex surfaces are in contact with each other, the surfaces are formed so as to fit completely together. A cylindrical body 17 is fitted and fixed on the outside of the movable core 16 and fixed receivers 13, 13a. The above-mentioned first and second coils 2 are disposed outside the cylindrical body 17.
0,21 are wound.

An auxiliary yoke 24 is disposed at an intermediate portion of the magnetic yoke 11 and extends continuously in the axial direction between the first and second coils 20 and 21. That is, in FIG. 1, the outer diameter of the boundary between the first and second coils 20 and 21 at the intermediate portion of the magnetic yoke 11 is approximately equal to the inner diameter of the magnetic yoke 11;
A toroidal auxiliary yoke 24 having an outer diameter approximately equal to the outer diameter of 7
are fitted and fixed.

Further, at one end of the operating rod 15, there is a nearly disk-shaped connector 2.
5 is inserted and fixed, and a rod-shaped fixing piece 26 is integrally formed at the end of the connecting tool 24 on the side connected to the load W. This fixing piece 26 is inserted and fixed into a fixing hole formed in the load W.

In the conventionally used electromagnetic plunger shown in FIG. 1 whose configuration has been explained above, the operation when driving the operating rod 15 connected to the load W to the left in the figure will be described. In this state before driving, the V-shaped convex portion 19a of the movable iron core 16 and the V-shaped convex portion 19a of the fixed receiver 13a
The letter-shaped recess 18a is abuttingly fitted.

When a current is supplied to the first coil 20, a magnetic field _H1 is formed in the movable iron core 16 in the axial direction by this current. For this reason, the magnetic yoke 11, fixed receiver 13, movable iron core 16, auxiliary yoke 2
4, the magnetic yoke 11, the fixed receiver 13a, the movable iron core 16, and the fixed receiver 13 form a closed magnetic path.
The magnetic energy in this closed magnetic path applies force to the movable portion, and the movable iron core 16 moves to the left in the figure. As the movable iron core 16 moves, the operating rod 15 fixed thereto also moves in the same direction, so the load W is driven and moved to the left in the figure.

However, in this conventional device, when the operating rod 15 moves, an attractive force acts between the surface of the V-shaped recess 18a of the fixed receiver 13a and the surface of the V-shaped protrusion 19a of the movable iron core 16, so that the overall As you can see, the driving force to the left in the figure decreases accordingly.
In addition, in this state, the movable core 16 is fixed to the operating rod 15, and since a load is connected to the operating rod 15, the movable core 16 must always be driven with the full load upon starting. No. Therefore, in this case, it was necessary to form a fairly large magnetic field H ₁ with the first coil 20 and drive the operating rod 15, which moves under load, via the movable iron core 16 from the beginning. Furthermore, the movable core 16 is attached onto the operating rod 15 by connecting the V-shaped convex portions 19, 19a on each end surface of the movable core 16 and the fixed receivers 13, 1.
It was necessary to accurately fit the V-shaped recesses 18, 18a of 3a at the abutting positions, and high precision machining was required for manufacturing.

This invention solves these conventional problems and provides an electromagnetic plunger with a simple structure that can start the movable iron core without any load and provide the kinetic energy to the operating rod for efficient driving. This is what made it possible.

This idea has the following configuration. A non-magnetic operating rod that is movable along the axis is disposed at the axial center position of the air-core first and second coils.
Further, first and second stoppers are formed on the operating rod to be located within the first and second coils. A movable iron core passed through the operating rod is disposed on the operating rod so as to be movable between the two stoppers. Fixed receivers are provided on both end faces of the magnetic yoke to which the movable iron core comes into contact via the respective stoppers, and an auxiliary yoke is formed between the first and second coils in the intermediate portion of the magnetic yoke. .

Due to this configuration, according to this invention, the movable iron core moves without load at the time of startup, so it can be driven with a relatively weak electromagnetic force, and the kinetic energy is imparted to the operating rod via the stopper. Therefore, the operating rod can be driven under a load by this kinetic energy and the energy given to the movable core by the magnetic field of the coil. Moreover,
When the operating rod moves, it is not affected by the magnetic attraction force between the movable core and the fixed receiver, unlike in the conventional case, and a large load can be driven with a small driving force.

Hereinafter, the electromagnetic plunger of this invention will be described in detail based on its embodiments using the drawings. Second
The figure shows the structure of an embodiment of the electromagnetic plunger of this invention, and the same parts as those of the conventional device shown in FIG. 1 are given the same reference numerals. Also in the following description of the configuration, repeated description of the same components as in the prior art will be omitted.

A non-magnetic operating rod 1 is movably moved along the axis of the first and second coils 20 and 21.
5 is disposed, and on this operating rod 15, first and second stops are disposed located within the first and second coils, respectively. That is, in the embodiment shown in FIG. 2, for example, collar-shaped first and second stoppers 22 and 23 are embedded and fixed on the operating rod 15, which is attached to the axial center position so as to be movable along the axial center. ing. The first stopper 22 is an air-centered first stopper 22.
The second stopper 23 is located within the air-core second coil 21 .

A movable iron core 16 is provided on the operating rod 15 so as to be movable between the first and second stoppers 22 and 23 and penetrated by the operating rod 15 . That is, in the embodiment shown in FIG. 2, an opening having an inner diameter slightly larger than the outer diameter of the operating rod 15 is formed around the central axis of the substantially cylindrical movable core 16, and the operating rod 15 is inserted through the opening. A movable iron core 16 is mounted on the operating rod 15 so as to be movable with little mutual friction. This movable iron core 16 is mounted on the operating rod 15 so as to be located between the first and second stoppers 22 and 23 described above. Cylindrical body 17 and its movable iron core 16
The contact surfaces are also configured to minimize mutual friction.

Also, like the conventional one, the movable core 16 has V-shaped convex surfaces 19, 19a on both end surfaces, and the corresponding fixed receivers 13, 13a have V-shaped concave surfaces 18, 18a. each formed. In this embodiment, each V-shaped convex surface 19,
19a and the V-shaped concave surfaces 18, 18a are brought into contact via first and second stoppers 22, 23, respectively.

The operation of the electromagnetic plunger of this invention, whose configuration has been explained above, is driven under a load W will be described. When a current is supplied to the first coil 20, a magnetic field in a direction parallel to the axis is generated within the movable iron core 16.
H ₁ is formed. magnetic yoke 11, fixed receiver 13,
Movable core 16, auxiliary yoke 24, magnetic yoke 11, fixed receiver 13a, movable core 16, fixed receiver 13
Since a closed magnetic path is formed, a force acts on the movable iron core 16 due to the magnetic energy within this magnetic path. In this case, the movable core 16 can be started without any load, so it can be moved with a relatively small force.

Therefore, the movable iron core 16 is moved to the second stopper 23.
It detaches from the motor, moves on the operating rod 15 under no load, and collides with the first stopper 22. At this time, the kinetic energy of the movable core 16 is released via the first stopper 22, and this energy applies a force to the operating rod 15 to the left in the figure. Even after colliding with the stopper 22, the movable iron core 16 is given a force to move to the left in the figure by the magnetic energy accumulated in the above-mentioned closed magnetic path. Therefore, from this moment on, the operating rod 15 has the first
The kinetic energy applied to the stopper 22 and the driving force generated by the magnetic energy accumulated in the closed magnetic path applied from the first stopper 22 through the movable iron core 16 move to the left in the figure under a load. I will do it.

In this way, when the electromagnetic plunger of this invention starts moving while carrying the load, first the movable iron core 1 is
6 moves a predetermined distance without any load, and the kinetic energy is transferred to the operating rod 15 through the first stopper 22.
give to The operating rod 15 that bears the load from this moment on
A driving force is given to the stopper by this kinetic energy and the energy given from the closed magnetic path given to the stopper through the movable iron core 16.

Therefore, according to the electromagnetic plunger of this invention,
Since the kinetic energy of the movable iron core 16, which moves without load at the time of startup, is used to start the operating rod 15, the loaded operating rod 15 can be efficiently driven even by a relatively small driving magnetic field compared to the conventional method. becomes possible.

As described above, as the movable iron core 16 moves within the magnetic field, the driving force applied to the operating rod 15 from the first stopper 22 portion causes the operating rod 15 to bear a load and move toward the left side in FIG. Move to the V of fixed receiver 13.
The letter-shaped concave surface 18 and the V-shaped convex surface 19 of the movable iron core 16
are brought into contact with each other via the first stopper 22, and the driving of the load W to the left is completed. In order to drive the load W to the right in the figure and return the electromagnetic plunger from this state, a current is supplied to the second coil 21,
This is done by creating a magnetic field _H2 in the opposite direction within the movable iron core 16. The operation in this case is the same as in the case of moving the load W to the left as described above, so a repeated explanation will be omitted.

The structure of the electromagnetic plunger of this invention is not limited to that shown in the embodiments; for example, the shape of the magnetic yoke may not be cylindrical but may be a cylindrical rectangular parallelepiped. Further, the V-shaped convex portion and concave portion formed on the movable core and the fixed receiver may also be omitted in some cases.

As explained above in detail, in the electromagnetic plunger of this invention, two stoppers, the first and second stoppers, are fixedly provided on the operating rod that moves under a load. A movable iron core is coaxially fitted to this operating rod so that it can move in the axial direction between the two. Therefore, at the time of starting, the movable core fitted to the operating rod that moves under load initially moves the distance to the stopper in an unloaded state to obtain kinetic energy. Since this kinetic energy is applied to the operating rod through the stopper that the movable iron core collides with, the driving energy including this kinetic energy is applied to the operating rod at the time of startup without loss, resulting in efficient operation. Furthermore, since it is not necessary to manufacture the movable iron core and the operating rod with precise alignment, it is extremely advantageous in terms of machining.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a conventionally used electromagnetic plunger, and FIG. 2 is a diagram showing the configuration of an embodiment of the electromagnetic plunger of this invention. 11: Magnetic yoke, 13, 13a: Fixed receiver, 1
5: Operating rod, 16: Movable iron core, 20: First coil, 21: Second coil, 22: First stopper, 23: Second stopper, 24: Auxiliary yoke.

Claims (1)

[Scope of utility model registration request] Air-centered first and second air-centered parts arranged on the same axis
a coil, an operating rod disposed at the axial center position of the first and second coils so as to be movable along the axis, and a coil on the operating rod inside the first and second coils, respectively. first and second located and arranged;
and the first and second stopper on the operating rod.
a movable iron core penetrated by the operating rod so as to be movable between the stoppers; a first movable iron core disposed on the side of the first and second stoppers and through which the operating rod is inserted;
and a second fixed receiver, a magnetic yoke disposed to connect the first and second fixed receivers, and a magnetic yoke connected continuously between the first and second coils at an intermediate portion of the magnetic yoke. An electromagnetic plunger having an auxiliary yoke disposed and extending in the axial direction.