JPH08251883A - Reciprocating linear drive - Google Patents

Abstract

PURPOSE: To get a mode to drive a spool with no sound and large initial attraction by moving the spool forward with the current application to a first exciting coil, and moving it backward with the current application to a second exciting coil thereby reciprocating the load linked to the spool. CONSTITUTION: The peripheries of collars 4a and 4b are set in the casing 2a of a device, and annular exciting coils 5a and 5b are installed in the cavities, and when a current is applied to the exciting coil 5a, lands 1a and 1b shift right, being attracted by the magnetic poles of the collar 4a, and stop in the position where they are superposed completely on the magnetic poles. Accordingly, the load B linked to the left end of the land 1 is driven rectilinearly by the widths of the lands 1a and 1b, but since the magnetic path is closed, the magnetic flux by the exciting coil 5a becomes large, and the driving force of the load B becomes large. Next, when a current is applied to the exciting coil 5b, lands 1c and 1d are attracted by the magnetic pole of the collar 4b, and the spool 1 shifts left, and it stops after being driven by the widths of the lands 1c and 1d. As a result, the reciprocation of the load can be made with no sound and the initial driving force can be enlarged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION It is used as a means for reciprocating a member of a mechanical device for a set stroke by controlling energization.

2. Description of the Prior Art There are electromagnetic plungers to achieve the same purpose.

[0002]

The electromagnetic plunger, which is a conventionally well-known means, has the following two problems to be solved. First problem A loud shock noise is generated during operation. Second problem There is a disadvantage that the force is the smallest at the initial stage when the output is the most necessary and becomes the largest at the end point of the operation.

[0003]

A magnetic cylinder serving as an actuator, which is supported by a bearing of an outer casing so as to be movable left and right in an axial direction, and a predetermined cylinder fixed coaxially with the cylinder at a predetermined distance. The first, second, third, and fourth magnetic cylinders whose width is larger than that of the cylinder, and the first and second magnetic cylinders whose width and separation distance are fixed outside on the inner circumference of the outer casing. The first and second magnetic poles having the same annular shape are provided, and the magnetic bodies serving as the magnetic paths are provided on the outer circumferences of the first and second magnetic poles.
A first stator in which a first exciting coil is mounted in an annular space between the magnetic poles, and a width and a separation distance at which the outer side is fixed to the inner circumference of the outer casing and third and fourth magnetic cylinders. The third and fourth magnetic poles having the same annular shape are provided, and the magnetic bodies serving as the magnetic paths are provided on the outer circumferences of the third and fourth magnetic poles.
A second stator having a second exciting coil mounted in an annular space between the magnetic poles of the first magnetic pole, the outer circumference of the first and second magnetic cylinders, and the inner circumferences of the first and second magnetic poles. The ends of the first and second magnetic cylinders face the ends of the first and second magnetic poles, and the outer circumferences of the third and fourth magnetic cylinders and the third and fourth magnetic cylinders face each other. A means for holding the actuator at a position where the opposing portions of the inner circumference of the fourth magnetic pole coincide with each other, and the first and second magnetic material cylinders are respectively provided with the first and second magnetic cylinders by energizing the first exciting coil. The magnetic poles are attracted to move forward, and when the second exciting coil is energized, the third and fourth magnetic cylinders are attracted to the third and fourth magnetic poles, respectively, and return to move the actuator axially. The actuator is configured to be reciprocally driven to reciprocally drive a load connected to the operator.

[0004]

By energizing the first exciting coil, the first and second magnetic poles are excited to attract the first and second magnetic cylinders to move the actuator forward, and the third and fourth magnetic poles are moved forward. Is excited by energizing the second magnetic coil to the second exciting coil, attracting the third and fourth magnetic cylinders, returning the actuator, and reciprocating the load connected to the actuator to linearly drive the actuator. To do. There is a feature that the initial suction force is increased without generating mechanical noise during the operation.

[0005]

The details of the present invention will be described with reference to FIG.
Items with the same symbol in each drawing have the same function, so
The duplicated description will be omitted. FIG. 1 is a diagram showing the appearance. The side plates 3a and 3 are provided to the left and right of the symbol 2 which is a cylindrical outer casing.
b is fixed, the actuator 1 is driven to the left and right, and a load (not shown) is connected to the left end of the actuator 1. 2 is shown in FIG.
FIG. In FIG. 2, side plates 3a and 3b are fitted on both sides of the cylindrical outer casing 2, and circular holes 6a and 6b serving as bearings are provided in the central portions of the side plates 3a and 3b. The circular holes 6a and 6b support a cylinder 1 made of mild steel, which serves as an actuator, so as to be slidable from side to side.

The cylinder 1 is provided with coaxial cylinders 1a, 1b, 1c, 1d made of mild steel and having a large diameter, which are made by cutting. The width of each cylinder is the same and has a predetermined width.
The distances a, 1b and the cylinders 1c, 1d are equal to each other and are larger than the width of the cylinder by a predetermined value. Outer casing 2
Inside of a, the outer circumferences of mild steel annular rings 4a and 4b are fitted,
Ring-shaped excitation coils 5a and 5b are mounted in the ring-shaped holes inside the rings 4a and 4b. Excitation coil 5
When electricity is applied to a and 5b, both sides of the rings 4a and 4b are N and S.
The magnetic poles are excited to become N and S magnetic poles.

The width of the magnetic poles on both sides of the rings 4a and 4b is that of the cylinder 1.
a, 1b and the widths of the cylinders 1c, 1d are equal, and N,
The separation distance between the S magnetic poles is also equal to the separation distance between the corresponding cylinders. The outer sides of the cylinders 1c and 1d and the inner side of the magnetic poles of the annular ring 4b are opposed to each other with a gap (0.2 mm) therebetween, and are in the relative positions shown in the drawing. The right ends of the cylinders 1a and 1b and the left end of the magnetic poles of the circular ring 4a are overlapped by a small distance as shown in the drawing.
It is configured to completely overlap 1d.

When the exciting coil 5a is energized, the cylinders 1a and 1b are attracted and moved to the right by the magnetic poles of the ring 4a,
It stops at the position where the magnetic poles of the cylinders 1a and 1b and the annular ring 4a completely overlap each other. Therefore, the load B connected to the left end of the cylinder 1 is linearly driven by the width of the cylinders 1a and 1b. At this time, the right end of the magnetic pole of the circular ring 4b and the left end of the cylinders 1c and 1b are overlapped by a slight distance and stop. Next, when the exciting coil 5b is energized, the cylinders 1c and 1d are attracted to the magnetic poles of the circular ring 4b, and the cylinder 1 moves leftward by the width of the cylinders 1c and 1d.
The cylinder 1 is driven by the width of and stopped. Therefore, the load B is also driven to the left by the width of the cylinders 1c and 1d.

As can be understood from the above description, the load B is changed by alternately energizing the exciting coils 5a and 5b.
Is linearly driven left and right by a predetermined distance. Since the magnetic path is closed by the cylinder 1, the cylinder 1a, the ring 4b, and the ring 1b, the magnetic flux generated by the exciting coil 5a is increased, and the driving force of the load B is increased. The graph of FIG. 4 is a graph of load driving force, where the horizontal axis is the moving distance of the cylinder 1 which is the actuator, and the vertical axis is the suction force. In the known electromagnetic plunger, the initial attraction force is small and the attraction force at the end is maximum, as shown by the curve 7. In the device of the present invention, as shown by the curve 8, the initial suction force is large and then gradually decreases. Therefore, there is a feature that a large load can be driven. The above operation will be described with reference to FIG. In FIG. 5, the magnetic poles of the circular ring 4a and the cylinder 1a show a cross section, and magnetic force lines 9a, 9b, and 9c of arrows are generated at the facing portions. At this time, the magnetic pole of the ring 4a is excited to the N pole, and the cylinder 1a is excited to the S pole by magnetic induction. The magnetic force lines 9a at the facing portion have little influence on the attraction force in the arrow A direction, but the attraction lines in the arrow A direction can be obtained by the magnetic force lines 9b and 9c. The attraction force by the magnetic force line of the arrow 9a is proportional to the square of the current of the exciting coil, and the attraction force by the magnetic force line of the arrows 9b and 9c is proportional to the first power of the current. When the gap length becomes 0.1 mm or less, the magnetic force line of the arrow 9a becomes perpendicular to the facing surface and the suction force disappears. Therefore, as shown by the curve 8 in the graph of FIG. 4, the initial suction force is large and the suction force is flat. There is a characteristic that becomes.

FIG. 3 shows a mounting means for the exciting coils 5a and 5b, and the exciting coil 5a is shown as an example. The ring (made of mild steel) 4a is divided into left and right as indicated by a symbol 11a. The exciting coil 5a wound in an annular shape shown by a dotted line is sandwiched from the left and right, and the exciting coil 5a is inserted from the hole 11b.
The terminal a is led out, and this lead wire is led out to the outside from the hole provided in the side plate 3a in FIG. The ring 4a described above
Is fitted inside the outer casing 2 and fixed at the position shown in FIG. The circular ring 4b is also made by the same means and is fitted inside the outer casing 2 and fixed at the position shown in FIG. As can be understood from the above description, there is a feature that the linear reciprocal drive of the load can be performed silently and in a mode in which the initial driving force is large by controlling the energization of the exciting coils 5a and 5b.

[0011]

As described above, it is possible to obtain a linear drive device which can perform reciprocal drive of a load silently, has a large initial drive force, and has a small decrease in the drive force thereafter.

[Brief description of drawings]

FIG. 1 is a side view of the device of the present invention.

FIG. 2 is a cross-sectional view of the device of the present invention.

FIG. 3 is an explanatory diagram of a stator, an exciting coil, and an actuator.

FIG. 4 is a graph of the moving distance of the actuator and the suction force.

FIG. 5 is an explanatory diagram of magnetic flux and attractive force generated in magnetic poles.

[Explanation of symbols]

 1 Cylindrical magnetic actuator 1a, 1b, 1c, 1d Magnetic cylinder 5a, 5b Excitation coil 4a, 4b Annular mild steel stator 2 Cylindrical outer casing 3a, 3b Side plate B Load 6a, 6b Circular Bearing 11a Joint part of the stator 4a 11b Holes through which the lead-out line passes 9a, 9b, 9c Magnetic field lines 7, 8 Curve of suction force

Claims (1)

[Claims] 1. A magnetic cylinder, which is an actuator and is supported by a bearing of an outer casing so as to be able to move left and right in the axial direction, and a cylinder having a predetermined width that is fixed coaxially with the cylinder at a predetermined distance. The first, second, third and fourth magnetic cylinders having a larger diameter, and the width and the separation distance at which the outer side is fixed to the inner circumference of the outer casing are
The first and second magnetic poles, which are annular and have the same diameter as the second magnetic cylinder, are provided on the outer circumferences of the first and second magnetic poles. The first stator having the first excitation coil mounted in the annular space between the magnetic poles of the
The third and fourth magnetic poles, which are annular and have the same diameter as the fourth magnetic cylinder, are provided on the outer circumferences of the third and fourth magnetic poles. A second stator having a second excitation coil mounted in an annular space between the magnetic poles of the first magnetic pole, the outer circumference of the first and second magnetic cylinders, and the inner circumferences of the first and second magnetic poles. While facing each other through the gap,
The ends of the second magnetic cylinder and the ends of the first and second magnetic poles face each other, and the outer circumferences of the third and fourth magnetic cylinders and the inner portions of the third and fourth magnetic poles face each other. By energizing the means for holding the actuator at the matching position and the first exciting coil, the first and second magnetic cylinders are respectively attracted by the first and second magnetic poles to move forward, When the exciting coil is energized, the third and fourth magnetic cylinders are attracted to the third and fourth magnetic poles respectively and return to actuate the actuator back and forth in the axial direction to connect the actuator. A linear reciprocating drive device configured to reciprocally drive an installed load.