JP2514499Y2 - Rotless dress cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention is made of a non-magnetic material and has a permanent magnet on either the outer circumference of a piston fitted in a cylinder tube or the inner circumference of a slider fitted on a cylinder tube. The present invention relates to a rodless cylinder in which a slider is integrally slid with a piston due to a magnetic attraction force between the permanent magnet and the permanent magnet or the magnetic material, and the permanent magnet or the magnetic material is fixed to the other.

Problems to be Solved by Conventional Techniques and Inventions As a rodless cylinder utilizing the magnetic attraction force as described above, conventionally, a piston is mounted on a single circular cylinder tube fixed between a pair of head covers. In order to prevent the slider from rotating around the axis of the cylinder tube,
A slider provided with a guide bar parallel to the cylinder tube between both head covers was used.In a rodless cylinder with such a structure, the ratio of the cross sectional area of the cylinder tube to the cross sectional area of the slider is Since it is small, the thrust generated by the action of air pressure on the piston is not sufficiently large with respect to the weight of the slider.
In addition, when the diameter of the cylinder tube is increased to obtain a large thrust, the slider becomes significantly large and its weight also increases accordingly. The same problem occurs in the case where the cylinder tube and the head cover are fixed and used to move, and for this reason, a rodless cylinder capable of obtaining a large thrust while achieving downsizing and weight saving is desired. It was

Means for Solving the Problems The present invention, as means for solving the above problems,
Between the pair of head covers, a plurality of cylinder tubes, which are made of a non-magnetic material and in which pistons are airtightly and freely slidably fitted, are fixed parallel to each other, and the plurality of cylinder tubes are fixed to each other. A slider having a through hole is relatively slidably fitted by externally fitting the through hole, and a permanent magnet is fixed to either the outer circumference of the piston or the inner circumference of the through hole. A permanent magnet or a magnetic body is fixed to the slider, and the slider is slid integrally with the piston by a magnetic attraction force between the permanent magnet and the permanent magnet or the magnetic body.

The operation and effect of the present invention With the above-described structure, the slider or the head cover is fixed when either the slider or the head cover is fixed and the driven member is connected to the other to generate a thrust by supplying pressurized air. It moves in the axial direction of the cylinder tube, and at this time, the cylinder tube also serves as a guide bar for preventing the slider from relatively rotating around the axis of the other cylinder tube.
Relative rotation does not occur between the slider and the cylinder tube, and since the magnitude of thrust is proportional to the total cross-sectional area of the cylinder tube, it is necessary to change the diameter and number of cylinder tubes. The cross-sectional shape of the slider and the head cover can be set arbitrarily by appropriately setting the diameter dimension of the cylinder tube, the number of cylinders, and the arrangement method. It is possible to have a desired shape such as.

In the rodless cylinder of the present invention, a plurality of cylinder tubes are provided to serve also as a guide bar for preventing relative rotation of the slider with respect to the cylinder tube. Therefore, a dedicated guide bar is provided through the slider. The ratio of the total cross-sectional area of the cylinder tube to the cross-sectional area of the slider or the head cover is larger than that of the rodless cylinder described in (1) above. is there.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, reference numerals 1 and 1 denote a cylindrical shape having the same inner diameter and length, and a pair of head covers 2 and 2 in a horizontal plane.
2 made of non-magnetic material that is placed parallel to each other between
In this cylinder tube, the cylinder tubes 1 and 1 are fixed by screwing both ends to two sealing bodies 3 and 3 fitted to each head cover 2, while Each head cover 2 is formed with a port 4 which is connected to a pressurized air supply source (not shown), and a through hole 6 which extends from the peripheral groove 5 on the outer periphery of the sealing body 3 to reach the inside of the cylinder tube 1. And a communication hole 7 for communicating the peripheral grooves 5, 5 of the both sealing bodies 3, 3 are formed,
As a result, the port 4 and the insides of the cylinder tubes 1 and 1 are communicated with each other.

A piston formed by screwing the tip of the center rod 10 protruding from one holding body 9a of the pair of circular holding bodies 9a and 9b to the other holding body 9b in the hollow of each cylinder tube 1. 8 is a piston packing 1 fitted onto both holding bodies 9a, 9b
The cylinder tube 1 is made airtight by 1 and 11, and wear rings 12 and 12 fitted on both holders 9a and 9b.
When the compressed air is supplied from the port 4 of one of the head covers 2 so as to maintain the concentricity with the compressed air, the same pressure by the compressed air acts on one end surface of both pistons 8, 8. Then, the pistons 8 and 8 relatively slide at the same speed in the cylinder tubes 1 and 1. Between the two holders 9a, 9b of each piston 8, a plurality of permanent magnets 14 each having an annular shape with one end surface having an N pole and the other end surface having an S pole are externally fitted to the center rod 10. The permanent magnets 14 are attached side by side in the axial direction, and the permanent magnets 14 are arranged so that the N poles or the S poles are adjacent to each other via an interposition plate 15 made of a magnetic material.

A slider that is rectangular between the head covers 2 and 2.
16 are arranged in such a manner that both cylinder tubes 1, 1 are concentrically penetrated through the two through holes 17, 17, and between the inner circumference of each through hole 17 and the outer circumference of the cylinder tube 1. , A plurality of permanent magnets 18 each having an annular shape and having N poles and S poles at both end surfaces are fitted to the cylinder tube 1 so as to be slidable relative to each other. The permanent magnets 18 are arranged so that the N poles and the S poles are adjacent to each other through the interposition plate 19 made of a magnetic material, and both pistons 8 and 8 have both through holes of the slider 16. As shown in FIG. 2, in the state of being positioned inside 17, 17, the north and south poles of the permanent magnets 14 of the piston 8 become the south and north poles of the permanent magnets 18 of the slider 16, respectively. Since the non-magnetic cylinder tube 1 is arranged in the radial direction with the wall thickness sandwiched between the two permanent magnets 14, 18 And summer as magnetic attraction force is generated between.

The rodless cylinder of this embodiment has the above-mentioned structure, and both head covers 2 and 2 are fixed to a fixing member (not shown) and a slider 16 is connected to a driven member (not shown) such as a table. When the compressed air is supplied and the compressed air is discharged from the other port 4,
Due to the magnetic attraction force generated between the permanent magnet 14 of the piston 8 and the permanent magnet 18 of the slider 16 as the two pistons 8, 8 slide at the same speed with respect to the cylinder tube 1, 1, The slider 16 slides in the horizontal direction integrally with both pistons 8 and 8, and conversely to the above,
In the state where the slider 16 is fixed and the driven member is connected to the head cover 2, the head covers 2 and 2 and the cylinder tubes 1 and 1 are attached to the pistons 8 and 8 and the slider 16 as the pressurized air is supplied and discharged. The cylinder cylinder 1 moves horizontally with respect to one another, and during the above-mentioned operation, one cylinder tube 1 is a guide for preventing relative rotation about the axis between the slider 16 and the other cylinder tube 1. Since it also serves as a bar, the slider 16 and the head covers 2 and 2 are kept in a fixed posture without rotating while sliding.

The rodless cylinder of the present embodiment, which has a structure in which two cylinder tubes 1 and 1 are penetrated through a slider 16, is a conventional rodless cylinder in which one cylinder tube and a rotation preventing guide bar are penetrated through the slider. Compared with, the ratio of the cross-sectional area of the cylinder tube to the cross-sectional area of the slider in the plane perpendicular to the axis of the cylinder tube is twice that of the conventional rodless cylinder, and the magnitude of the thrust generated by a constant air pressure is Since it is proportional to the cross-sectional area of the piston, that is, the cross-sectional area of the cylinder tube, the thrust of the rodless cylinder of this embodiment is twice the thrust of the conventional rodless cylinder.

If a large thrust is not required in the rodless cylinder of the present embodiment, the diameter dimensions of both cylinder tubes 1 and 1 may be reduced, and the width and height of the slider 16 and the head cover 2 may be increased accordingly. It is possible to reduce the size of the ridge so that it can be made smaller and lighter.

In the above embodiment, two cylinder tubes 1,
Although the rodless cylinder using 1 has been described, according to the present invention, the number of the cylinder tubes may be three or more. In this case, the diameter dimension of the cylinder tube and the arrangement method are appropriately changed. Therefore, it is possible to arbitrarily set the cross-sectional shapes and dimensions of the slider and the head cover in the plane perpendicular to the cylinder tube, and the magnitude of the thrust force. When the cylinder tubes of the book are arranged in parallel on the horizontal plane, the slider and the head cover can be formed into a flat shape having a small height dimension.

Similarly, in the above-mentioned embodiment, the permanent magnets 14 and 18 are fixed to both the outer circumference of the piston 8 and the inner circumference of the through hole of the slider 16. However, the present invention uses the permanent magnets on either the piston side or the slider side. The present invention can be applied to a rodless cylinder having a structure in which a magnetic material such as an iron ring is fixed to the other side while the other side is fixed.

[Brief description of drawings]

The accompanying drawings show an embodiment of the present invention, FIG. 1 is a perspective view,
FIG. 2 is a longitudinal sectional view. 1: Cylinder tube, 2: Head cover, 8: Piston, 1
4: Permanent magnet (of piston), 16: Slider, 17: Through hole,
18: Permanent magnet (of slider)

Claims (1)

(57) [Scope of utility model registration request] 1. A plurality of cylinder tubes, which are made of a non-magnetic material and in which pistons are airtightly and slidably fitted in between a pair of head covers, are fixed in parallel with each other. A slider having a plurality of through holes formed therein is fitted into the tube so that the slider is relatively slidable by externally fitting the through holes, and the slider is permanently attached to either the outer circumference of the piston or the inner circumference of the through hole. A magnet is fixed, and a permanent magnet or a magnetic body is fixed to the other side so that the slider is slid integrally with the piston by a magnetic attraction force between the permanent magnet and the permanent magnet or the magnetic body. The rodless cylinder characterized by