JPH0774021A - Electromagnet device - Google Patents

Abstract

PURPOSE:To reduce operating noise, to prevent the destruction of a position detection switch and to form a device so as to be small. CONSTITUTION:An electromagnet device 1 is provided with an electromagnet 10 which is composed of an exciting coil 11, a fixed iron core 13 and a plunger 20, which is installed inside an operating box 40 and which can drive an object to be driven and with position detection switches. The plunger 20 is provided with a rear stop rubber 21 installed at a rear end part and with a front stop rubber 23 installed in an intermediate part. A permanent magnet 27 is attached to a position detection member 25 which is installed so as to be extended at one end part of the plunger 20. Position detection switches 30, 31 which can be made and broken according to the presence or obsence of a magnetic field along the movement direction of the permanent magnet are arranged and installed. The operating box 40 is formed of a magnetic member and constitutes a part of the fixed iron core 13. Then, a stop plate 24 which can be brought into contact with the rear stop rubber 21 for the plunger 20 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnet device having a plunger type electromagnet and capable of driving a driven body.

[0002]

2. Description of the Related Art Conventionally, as a driving source for linearly driving a driven body such as an electric power switchgear, a relatively small electromagnet device that generates a strong driving force has been used.

Such an electromagnet device generally has an exciting coil 51 and an exciting coil 5 as shown in FIGS.
1. A cylindrical fixed iron core 52 surrounding 1 and a plunger 53 which is constantly urged in the outward direction (retraction direction) of the exciting coil 51 by a load by a driven body (not shown) not shown.
It was formed by arranging the plunger-shaped electromagnet 50 consisting of and, and disposing the electromagnet 50 in the operation box 61 via the mounting member 54. A drive shaft 57 having a connecting plate 58 and a lever 59 is pivotally attached to the operation box 61,
The linear movement of the plunger 53 causes the linear movement of the drive shaft 5 via the engaging portion 56 formed by the long hole 58a provided at the tip of the connecting plate 58 and the bolt 55 provided at the rear end of the plunger 53.
7 is rotated, and the driven body is pulled and driven by the lever 59.

Further, on the extension of the axis of the plunger 53, a position detection switch 60 composed of a limit switch is provided.
The front end of the plunger 53 detects the forward movement of the plunger 53 by pressing the operating piece 60a of the position detection switch 60.

[0005]

However, in the electromagnet device having such a conventional structure, the forward movement actuating force of the plunger 53 at the time of energization is transmitted through the engaging portion 56,
The forward movement of the plunger 53 is performed by the bolt 5 in the engaging portion 56.
5 and the long hole 58a are engaged to be stopped by shock and stopped (shown by a solid line in FIG. 5), and at that time, a large metallic noise is generated. Further, when the energization is off, the plunger 53 is pulled back to the outside of the exciting coil 51 via the engaging portion 56 by the disappearance of the attraction force and the load by the driven body. Similar to the above, the retreat of the plunger 53 is impacted by the engaging portion 56 to be stopped and stopped (shown by a chain double-dashed line in FIG. 5), which causes a problem that a large metallic operation noise is generated.

Further, since the plunger 53 shockly presses the operating piece 60a at the forward position, there is a risk that the position detection switch 60 will be destroyed.

Further, a mounting member 54 for mounting the electromagnet 50
However, since the mounting height (h) of the electromagnet 50 is increased, the operation box 61 becomes large in size.

The present invention has been made in view of the above, and an object thereof is to reduce the operating noise, prevent the position detecting switch from being destroyed, and to make the device compact. Is to provide.

[0009]

The present invention has been made in order to achieve the above object, and is provided with an exciting coil, a fixed iron core, and a plunger that moves linearly, and is provided in an operation box to drive a driven body. An electromagnet device including a drivable electromagnet and a position detection switch for the plunger, wherein the plunger of the electromagnet includes a rear stopper rubber provided at a rear end portion and a front stopper rubber provided at an intermediate portion. In addition, a straight rod-shaped position detecting member is provided at one end of the plunger, and a permanent magnet is attached to the position detecting member, and a magnetic field of the permanent magnet is provided along the moving direction of the permanent magnet. A position detection switch that can be opened and closed depending on the presence or absence of the operation box is provided, and the operation box is formed of a magnetic member and constitutes a part of a fixed iron core of the electromagnet. It includes a stopper rubber and capable of abutting stopping plate after plunger, to become Te is an electromagnet and wherein the.

[0010]

The present invention is configured as described above,
The operation box forms a part of a fixed iron core that surrounds the exciting coil of the electromagnet and forms a part of a magnetic circuit, thereby reducing the height of the electromagnet.

The rear stopper rubber of the plunger elastically contacts the stop plate of the operation box at the retracted position of the plunger, and the front stopper rubber elastically contacts the front portion of the fixed iron core of the electromagnet at the advanced position of the plunger. Abut, reducing the actuation impact of the plunger at each position.

The position detecting member moves together with the plunger, and responds to the presence or absence of the magnetic field of the permanent magnet that follows it,
Turns the position detection switch on and off.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the electromagnet device of the present invention is shown in FIG.
3 to 3.

This electromagnet device 1 has a rear stopper rubber 2
1, a position detecting member 25 having an electromagnet 10 having a plunger 20 having a front stopper rubber 23 and a permanent magnet 27 attached to one end of the plunger 20
And position detecting switches 30 and 31 arranged along the moving direction of the permanent magnet 27 and capable of opening and closing depending on the presence or absence of a magnetic field of the permanent magnet 27, and an operation box 40 including a stop plate 42. Is configured.

The electromagnet 10 is composed of an exciting coil 11, a fixed iron core 13 and a plunger 20, the exciting coil 11 is wound around a cylindrical bobbin 12, and the fixed iron core 13 is provided so as to surround the exciting coil 11. There is. The fixed iron core 13 includes a fixed magnetic pole 14 made of a magnetic material, a fixed iron core rear portion 15, a fixed iron core front portion 16, and a fixed iron core main body portion 17, each of which is made of a magnetic plate material. It is formed by a part (specifically, the magnetic circuit forming portion 41a).

The fixed magnetic pole 14 is fitted in the bobbin 12 and is formed in a round bar shape having a through hole (not shown) through which the position detecting member 25 can penetrate, and one end side (the right end side in FIG. 1). ) Has a conical hole-shaped receiving portion 14a and is fixed to the fixed core rear portion 15. The fixed iron core rear portion 15 is formed in a rectangular shape and has a through hole (not shown) through which the position detection member 25 can penetrate, and the fixed iron core main body portion 17 is formed.
It is fixed to the rear part (on the left end side in FIG. 1).

The fixed iron core front portion 16 is formed in a rectangular shape and has a through hole (not shown) into which the plunger 20 can be loosely fitted.
It is fixed to the front portion (right end side in FIG. 1) of the fixed core body portion 17. The fixed iron core body portion 17 is formed in a U-shaped cross section, and mounting portions 17a and 17a are formed at the open ends thereof, respectively.

The plunger 20 is formed of a magnetic material in the shape of a round bar that can be moved directly in the bobbin 12. The rear end portion 20a of the plunger 20 is made of, for example, NBR and has a U
A rear stopper rubber 21 curved into a letter shape is attached by a bolt 22. An annular front stopper rubber 23 is provided in the middle of the plunger 20 in the longitudinal direction.
4 is positioned and attached. The tip portion 20b is formed in a conical shape, and when the plunger 20 is at the forward position, the tip portion 20b and the receiving portion 1 of the fixed magnetic pole 14 are formed.
It is formed so as to maintain a predetermined gap with 4a.

The electromagnet 10 is composed of the fixed core body 1
The mounting portion 17a of No. 7 is integrally attached to the bolt, which is stud-welded to the main body 41 of the operation box 40, by the nut 18. As a result, the body 41 is fixed to the rear portion 15 of the fixed core.
A magnetic circuit forming portion 41 a is formed between the stationary core front portion 16 and the fixed core front portion 16 in proximity to the exciting coil 11.

The position detecting member 25 is formed in a straight rod shape,
It is fixed to the tip of the plunger 20 while sharing the axis. At a predetermined position of the position detecting member 25, a permanent magnet 27 for opening and closing the position detecting switches 30, 31 is opened.
Is installed.

The position detection switches 30 and 31 are reed switches that close their contacts under the influence of their magnetic fields due to the proximity of the permanent magnet 27 and open their contacts when the permanent magnet 27 moves away. And is parallel to the moving direction of the permanent magnet 27 and has a predetermined distance from the permanent magnet 27 and is mounted on the main body 41 by the mounting base 33. Then, at the forward position of the plunger 20, the permanent magnet 27 closes its contact point relative to the position detection switch 30, and at that time, the position detection switch 3
The contact No. 1 is open. Further, at the retracted position of the plunger 20, the permanent magnet 27 is arranged so as to face the position detection switch 31 and close its contact, and open the contact of the position detection switch 30. As a result, the position detection switches 30 and 31 are mechanically operated in a non-contact manner and have extremely high durability, and stable position detection can be performed against vibration of the device.

Instead of the position detection switches 30 and 31, one reed switch capable of selectively switching between the a contact and the b contact depending on the presence or absence of a magnetic field may be provided. Further, instead of the position detection switch, the same effect can be obtained even if the position is detected using a magnetic sensor.

The operation box 40 is composed of a main body 41 made of a thick magnetic plate and a lid 43 covering the opening. A rear stopper rubber 21 is brought into contact with a predetermined position of the main body 41, and a stop plate 42 that defines a retracted end of the plunger 20 is provided.
Is provided. In addition, the plunger 41 is attached to the main body 41.
A drive shaft 45 which is orthogonal to the axis line of and is rotatably supported by the bearing plate 43 is provided.

A connecting plate 46 is provided so as to project in the middle of the drive shaft 45, and a long hole 46a at the tip of the connecting plate 46 is rotatably engaged with a bolt 22 attached to the plunger 20. The engaging portion 48 is formed.

A lever 47 extending substantially vertically in FIG. 2 is fixed to the outer end portion of the drive shaft 45, and the linear movement of the plunger 20 causes the drive shaft 45 to pass through the engaging portion 48. Is rotated, and the drive end 47 at the tip of the lever 47 is rotated.
a and 47b are configured to move in opposite directions. Reference numeral 49 is a terminal block for electrically connecting the electromagnet 10 and the position detection switches 30, 31 to the outside.

Next, the electromagnet device 1 configured as described above.
The operation of will be described.

The electromagnet device 1 is electrically connected to a control panel (not shown), and the driving end 47a of the lever 47,
47b are respectively connected to the driven body, and drive end 4
The load of the driven body that constantly rotates the drive shaft 45 in the counterclockwise direction is added to 7a and 47b. This allows
When the exciting coil 11 of the electromagnet 10 is not energized, the plunger 20 is in the retracted position via the engaging portion 48, and the rear stopper rubber 21 is in contact with the stop plate 42 (see FIG. 4). Further, the position detecting member 25 is located on the right side of the drawing, the permanent magnet 27 thereof faces the position detecting switch 31, and the magnetic flux of the permanent magnet 27 closes the position detecting switch 31 to detect the retracted position of the plunger 20. At this time, the position detection switch 30 is outside the magnetic field of the permanent magnet 27 and is in an open circuit state.

When the exciting coil 11 is energized, the fixed iron core 1
3, magnetic flux is generated in the magnetic circuit formed by the magnetic circuit forming portion 41a and the plunger 20, and an attractive force acting on the fixed magnetic pole 14 acts on the plunger 20. As a result, the plunger 20 is sucked, moves forward (leftward in the drawing) against the load of the driven body via the engaging portion 48 and the drive shaft 45,
The front stopper rubber 23 comes into contact with the front portion 16 of the fixed iron core to define the forward end and stop. At this time, the plunger 20
There is a gap between the front end portion 20b and the receiving portion 14a of the fixed magnetic pole 14, and the plunger 20 and the fixed magnetic pole 14 do not collide. Then, the operating force of the plunger 20 is absorbed by the rubber elasticity of the front stopper rubber 23, the impact at the time of stopping at the engaging portion 48 is reduced, and the metallic noise is reduced. Therefore, both the level and frequency of operating noise are reduced.

As a result, the drive shaft 45 rotates clockwise, and the lever 47 rotates clockwise to move the drive ends 47a and 47b.
Move to the right and left respectively (see Fig. 2). By this movement, the driven bodies connected to the drive ends 47a and 47b are pulled and driven. At this time, the position detection member 25 moves to the left along with the plunger 20, the permanent magnet 27 laterally moves, faces the position detection switch 30, and the magnetic flux of the position detection member 30 closes the plunger 20. The forward position of is detected. At this time, the position detection switch 31 is outside the magnetic field of the permanent magnet 27 and is in the open circuit state.

When the excitation coil 11 is de-energized, the magnetic flux, that is, the attractive force of the plunger 20, disappears. As a result, the drive shaft 45 rotates counterclockwise by the load of the driven body, the lever 47 returns to the position shown in FIG. 4, and the rear stopper rubber 21 abuts on the stop plate 42, so that the plunger 20 moves. Move to the retracted position. At this time,
The retracting force of the plunger 20 is absorbed by the rubber elasticity of the rear stopper rubber 21, the impact at the time of stopping at the engaging portion 48 is reduced, and the metallic noise is reduced. Therefore, both the level and frequency of operating noise are reduced.

Then, the tension drive of the driven body is turned off,
The permanent magnet 27 of the position detecting member 25 is connected to the position detecting switch 3
It moves to a position opposite to 1, and detects the retracted position of the plunger 20.

[0032]

As described above, according to the electromagnet device of the present invention, the rear stopper rubber and the front stopper rubber provided on the plunger absorb and absorb the impacts when the plunger is operating, respectively, and reduce the operating noise of the electromagnet. can do.

Further, the position detection switch is mechanically contactlessly turned on / off by the movement of the magnetic field of the permanent magnet attached to the position detection member, which has extremely high durability and is resistant to vibration of the apparatus. On the other hand, stable position detection can be performed.

Furthermore, since a part of the fixed iron core of the electromagnet is formed by the operation box and the electromagnet and the operation box are integrally formed, the mounting member of the electromagnet can be omitted and the height of the electromagnet can be increased. This has the effect of making the device smaller and more compact.

[Brief description of drawings]

FIG. 1 is a side sectional view of an electromagnet device according to an embodiment of the present invention.

FIG. 2 is a front sectional view of the same.

FIG. 3 is a partial side view taken along the arrow A of FIG.

FIG. 4 is a front sectional view showing a retracted state of the plunger.

FIG. 5 is a front sectional view of a conventional electromagnet device.

FIG. 6 shows a conventional plunger type electromagnet B in FIG.
View from the arrow.

[Explanation of symbols]

 1 Electromagnet Device 10 Electromagnet 11 Excitation Coil 13 Fixed Iron Core 20 Plunger 21 Rear Stopper Rubber 23 Front Stopper Rubber 25 Position Detection Member 27 Permanent Magnets 30, 31 Position Detection Switch 40 Operation Box 41a Magnetic Circuit Forming Section

Claims (1)

[Claims] 1. An electromagnet device comprising an exciting coil, a fixed iron core, and a plunger that moves linearly, the electromagnet device being provided in an operation box and capable of driving a driven body, and having a position detection switch for the plunger. The plunger of the electromagnet includes a rear stopper rubber provided at a rear end portion and a front stopper rubber provided at an intermediate portion, and a straight rod-shaped position detection member is extended at one end portion of the plunger. At the same time, a permanent magnet is attached to the position detection member, and a position detection switch that can be opened / closed is provided along the moving direction of the permanent magnet according to the presence or absence of a magnetic field of the permanent magnet. A stop plate which is formed of a magnetic member and constitutes a part of a fixed iron core of the electromagnet, and which is capable of contacting a rear stopper rubber of the plunger. Electromagnet device to.