JP2575778B2 - Magnetic adjustment damping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention is used for supporting pipes in power plants and plans, etc., and does not restrain slow displacement due to temperature changes, and suppresses sudden vibrations caused by earthquakes and the like. Related to vibration damping devices
The purpose of the present invention is to make the vibration damping effect accurate and effective by using the magnetic resistance and the inertial resistance together.

(Conventional technology and problems) A snubber that uses both inertial resistance and magnetic resistance is actually
Known as 870. A magnet faces the outer surface of a rotating plate which is forced to reciprocate, and a damping action is provided by eddy current generated in the rotating plate. However, this structure lacks a means for freely adjusting the eddy current, and thus has a drawback that an accurate damping effect cannot always be expected.

(Means for Solving the Problems) The problem cannot be solved by a structure in which a magnet and an electric conductor correspond to each other.In the present invention, a rotating conductor is arranged between a pair of opposing magnet plates, and both magnet plates have a circumferential shape. The positive and negative electrodes were arranged at a plurality of equal angles.

When one of the magnet plates is rotationally adjusted, the path of the line of magnetic force passing through the conductor is inclined to increase or decrease its length. The damping torque increases as the passage length increases.

In this structure, the principle of operation differs depending on the quality of the conductor inserted between the poles. When the conductor is a so-called paramagnetic material such as aluminum or copper, the damping torque due to the eddy current increases as the rotation speed of the conductor increases. That is, it is suitable for damping high frequency vibration. When the conductor is a so-called ferromagnetic material such as iron or nickel, the vibration suppression torque is affected by the size of the area surrounded by the so-called hysteresis curve, and is not related to the rotation speed of the conductor. That is, in the case of a ferromagnetic material, it is also effective for vibration suppression of low frequency vibration.

In any case, there is no difference in that if one of the magnet plates is rotationally adjusted and the lines of magnetic force are inclined and elongated, the damping torque increases accordingly.

The choice of the conductor is determined in consideration of the target frequency range to be damped, but if the number of magnet plates is increased and the above-mentioned two types of conductors are incorporated, it should correspond to a wide frequency range. Is possible.

(Example) Drawings are described. The outer cylinder 1 has a large-diameter portion 1b and a small-diameter portion 1c connected via a partition 1a, and a lid 2 is fixed to the large-diameter portion. The inner cylinder 3 is inserted into the small-diameter portion 1c so as to be able to freely move in and out, has a ball nut 4 at the inner end, and has a handle 3a at the outer end. The center shaft 5 is a partition 1a at the center by a bearing B1.
And is screwed to the ball nut 4 on one side as a screw shaft 5a. The other side is a solid shaft 5b, and the end is supported by the lid 2 with a bearing B2.

The positioning cylinder 6 is concentrically fixed to the inner surface of the lid 2.
The adjustment plate 7 is supported by the solid shaft 5b by the bearing B3 and abuts on the positioning cylinder 6. The screw 8 is screwed into the positioning cylinder 6 in the radial direction, and the tip of the screw 8 is engaged with the adjustment plate 7 to restrict the rotation of the adjustment plate. The pair of magnet plates 9 and 9 have positive and negative electrodes N and S arranged alternately at a plurality of equal angles on the circumference, and are fixed to the opposing surfaces of the lid 2 and the adjusting plate 7. The rotating plate 10 is inserted between the two magnet plates leaving a gap on both sides, and is fixed to the solid shaft 5b. A desired inertia resistance can be obtained by using the rotating plate 10 as a mass having an appropriate weight.

The present invention is configured as described above. The lid 2 is fixed to the structure, and the pull 3a is connected to the pipe for use. Due to the vibration of the pipe, the inner pipe 3 moves in and out, and the center shaft 5 is reciprocally rotated, and the vibration is damped by using the magnetic resistance of the magnet plate or the inertial resistance of the rotary plate. Displacement of the piping due to temperature changes is unimpeded because of slow operation. Working window on the large diameter part of the outer cylinder
1d, the engagement between the adjusting plate 7 and the screw 8 is cut off,
The adjustment plate can be rotated by a desired angle and then re-coupled.

FIG. 3 shows another embodiment, in which a magnet plate 11 is inserted between a pair of magnet plates 9 and 9 and locked to a positioning cylinder 7 so that rotation can be adjusted by screws 12, and rotating plates 13 are provided on both sides thereof. , 14 are inserted and fixed to the solid shaft 5b. One of the two rotating plates is a paramagnetic material,
As described above, if the other is made of a ferromagnetic material, it can correspond to a wide frequency range.

(Effect) A device that converts linear vibration into relative rotational motion between constituent members and performs a vibration damping action by the accompanying magnetic loss is disclosed in
-4937. On the other hand, in the present invention, a magnet plate is arranged on both sides of the rotating plate, and the magnet plate is formed of a plurality of sectors. The rotation of one of the magnet plates is adjusted so that the positive and negative phases of both plates can be relatively changed. As a result, the length of the magnetic force lines can be freely adjusted, and the magnetic resistance can be set arbitrarily.
This cannot be obtained structurally in the above-mentioned reference, and this is a feature of the present invention.

[Brief description of the drawings]

FIG. 1 is a front view of the present invention, FIG. 2 is a plan view of a magnet plate, and FIG. 3 is a front view of another embodiment. 1 ... outer cylinder, 2 ... lid, 3 ... inner cylinder, 4 ... ball nut, 5 ... central axis, 5a ... screw axis, 5b ... solid axis, 6
...... Positioning cylinder, 7 ... Adjusting plate, 8 ... Screw, 9 ... Magnetic plate, 10 ... Rotating plate, 11 ... Magnetic plate, 12 ... Screw, 13,1
4 ... Rotating plate

Claims (1)

(57) [Claims] An outer cylinder having a large diameter portion and a small diameter portion connected to each other via a central partition wall and having a lid at an outer end of the large diameter portion, a nut inserted at the inside of the small diameter portion so as to be able to move in and out, and a nut at an inner end and a nut at an outer end. An inner cylinder provided with a puller, a central shaft rotatably supported at the center by the central partition wall on one side to a screw shaft screwed to the nut and a solid shaft formed on the other side, and an inner surface of the outer cylinder lid A positioning cylinder fixed concentrically to the head, an adjustment plate locked to the positioning cylinder so as to be able to adjust the rotation on the solid axis, and a plurality of circumferentially equiangularly fixed to an opposing surface of the outer cylinder lid and the adjustment plate. It consists of a pair of magnet plates in which positive and negative electrodes are alternately arranged, and a rotating plate fixed to the solid shaft leaving a gap on both sides between the two magnetic plates, and adjusts the corresponding angular phase of the positive and negative electrodes of both magnetic plates. A magnetic adjustment damping device characterized by being made possible.