JPH0439446Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a reciprocating sliding device, and particularly to a reciprocating sliding device having a structure in which reciprocating motion of a piston is extracted to the outside without using a piston rod.

[Background Art] As such a reciprocating sliding device, one disclosed in, for example, Japanese Patent Laid-Open No. 118309/1983 has already been proposed.

That is, a circular piston is slidably positioned in a cylinder tube with a cut in the axial direction, and a movable member such as a table, which is provided outside the side surface of the cylinder tube and is subjected to an external load, is connected to the cut. The piston is connected through the cylinder tube, and the thrust force generated in the piston is transmitted to the moving member by alternately applying air pressure or the like to the fluid chambers formed between the piston and both ends of the cylinder tube. It is something.

However, with the above structure,
Since the thrust generated by the piston can be taken out to the outside without using a piston rod, it has the advantage of reducing the space required for installing the device compared to normal cylinder devices, but the piston is circular. Therefore, the thrust force obtained by the piston is small compared to the cross-sectional dimensions of the cylinder tube, and furthermore, the external force acting on the moving member is directly transmitted to the piston etc. located within the cylinder tube, which reduces the rigidity of the device. However, if the external load or piston movement speed is relatively large, or if a lateral load is applied to the moving member, vibrations may occur, causing rattling or galling, making it difficult to achieve smooth operation. There are some drawbacks such as no.

[Purpose of the invention] The purpose of the invention is to provide a reciprocating sliding device that is small and capable of obtaining a relatively large thrust.

Another object of the present invention is to provide a reciprocating sliding device capable of driving a table subjected to a lateral load at high speed and smoothly.

[Summary of the invention] The present invention provides a reciprocating sliding device in which the pressure receiving surface of the piston, which is located in a cylinder tube in which a cut is formed in the axial direction, is made oval, and the pressure receiving surface is provided on the outside of the side surface of the cylinder tube. By providing a guide bar on the table connected to the piston through a cut, it is possible to obtain relatively large thrust and smooth operation with a small size.

[Example] Fig. 1 is a partially cutaway sectional view of a reciprocating sliding device which is an embodiment of the present invention, and Fig. 2 shows the portion indicated by the line - in Fig. 1. FIG. 3 is a cross-sectional view of the portion indicated by the line -, FIG. 4 is a cross-sectional view of the portion indicated by the line -, and FIG. 5 is a plan view thereof.

The reciprocating sliding device of this embodiment uses a so-called rodless type cylinder structure, and both ends of the cylinder tube 1 are closed by end plates 2 and 3, and Y packing 4 and Y The seal 5 keeps the closing portion airtight.

A piston holder 8 having a piston 6 and a piston 7 fixed to both ends thereof is provided inside the cylinder tube 1.

Pressure ports formed in the end plates 2 and 3 are provided in the fluid chambers L and R formed respectively between the pistons 6 and 7 and the end plates 2 and 3 that close both ends of the cylinder tube 1. By applying fluid pressure such as compressed air as appropriate through 9 and the pressure port 10, a thrust in a predetermined direction is generated in the piston holder 8 to which the pistons 6 and 7 are fixed, and the piston holder 8 reciprocates inside the cylinder tube 1. It is said to be a structure that can be moved.

In this case, the pressure-receiving surfaces of the pistons 6 and 7 are formed into an oval shape consisting of two parallel straight lines and two semicircles, as shown in FIG.

Further, Y gaskets 11 and Y gaskets 12 are attached to the outer peripheries of the pistons 6 and 7, and the sliding portions with the cylinder tube 1 are kept airtight.

A cut 13 having a predetermined width is formed in the side wall of the cylinder tube 1 in the axial direction, and a part of the connecting tool 14 fixed to the piston holder 8 is passed through the cut 13 to the outside of the cylinder tube 1. It is prominent.

On the other hand, a table 15 is provided on the outside of the side surface of the cylinder tube 1, and is fixed via a spring pin 16 to a connecting tool 14 protruding outside through the cutout 13, so that the table 15 is positioned inside the cylinder tube 1. The piston holder 8 is configured to move in the axial direction together with the piston holder 8.

A sliding bearing 14a is provided at the sliding portion between the connector 14 and the cutout 13, and is configured to reduce sliding resistance acting on the connector 14.

In this case, the table 15 is penetrated by a plurality of guide bars 17 and 18 whose both ends are fixed to the end plates 2 and 3, respectively, and which are provided in parallel to the axial direction of the cylinder tube 1. is configured to be slidably guided in the axial direction of the cylinder tube 1.

Further, in the direction along the cutout 13 inside and outside the cylinder tube 1, an inner seal band 19 made of, for example, a non-magnetic material and an outer seal band made of a magnetic material are provided so that a part of the cylinder tube 1 is in sliding contact with the connecting tool 14. A band 20 is provided and fixed by support plates 21a, 21b provided at the ends of the cylinder tube 1 and screws 22a (only one of which is shown).

Then, the connecting tool 14 is moved in the axial direction of the cylinder tube 1 while pushing the inner seal band 19 and the outer seal band 20 apart, and the inner seal band 19 is moved by the increase in the internal pressure of the fluid chambers L and R. Permanent magnets 23a and 23b, which are in close contact with the cut 13 to prevent fluid from leaking through the cut 13, and which are arranged along both sides of the cut 13 on the outer periphery of the cylinder tube 1, are made of magnetic material. Due to the close contact of the outer seal band 20, dust and the like in the working environment are prevented from entering the interior of the cutout 13.

Also, the table 15 has a cylinder tube 1.
A dust seal 24 is provided between the
Dust and the like are prevented from entering the inside of the cylinder tube 1 through the open portion of the cutout 13 formed by pushing the inner seal band 19 and the outer seal band 20 apart by the connector 14.

A buffer 25 and a buffer 26 are attached to the end plates 2 and 3, and the table 15
The structure is designed to absorb shocks at the end of the stroke.

The operation of this embodiment will be explained below.

Initially, pressure ports 9 and 10 are connected to, for example, a compressed air pressure source (not shown) or the like via a control valve (not shown) or the like.

Next, by applying compressed air pressure or the like to the pressure port 9 (10), the internal pressure of the fluid chamber L (R) is increased, and the inner seal band 19 is opened at the cut 1
3 to maintain airtightness within the fluid chamber L(R), and a thrust force is applied to the piston holder 8 in the right (left) direction via the piston 6 (7) constituting the fluid chamber L(R). is generated.

The connecting tool 14 fixed to the piston holder 8 moves while pushing the inner seal band 19 and the outer seal band 20 apart, and the table 15 connected to the piston holder 8 via the connecting tool 14 moves as shown in FIG. A predetermined task such as transporting an article (not shown) that is moved to the right (left) direction and placed on the table 15 or driving an external load (not shown) connected to the table 15 is carried out. It will be done.

Here, in this embodiment, since the pressure receiving surfaces of the pistons 6 and 7 are oval, the shape of the pressure receiving areas of the pistons 6 and 7 is different from that in a case where the pressure receiving areas of the pistons 6 and 7 are simply circular. The shape of the cylinder tube 1 in which the pistons 7 are accommodated is flattened and miniaturized, and the cross-sectional area of the cylinder tube 1 is effectively utilized, and the pressure receiving area of the pistons 6 and 7 is relatively large, and the piston holder 8, that is, the table 15, a large thrust can be obtained.

In addition, Table 1 is subjected to an external load.
5 is slidably guided by the guide bars 17 and 18, so that external loads acting on the table 15 are guided by the guide bars 17 and 18.
8 and does not act directly on the piston holder 8 or the pistons 6 and 7 that drive the table 15, the rigidity of the device is large, and the applied load and the moving speed of the table 15 are relatively small. Even when the table 15 is large, or when a lateral load or the like is applied to the table 15, smooth operation can be obtained without generating vibrations.

It goes without saying that the present invention is not limited to the above-described embodiments, and can be modified in various ways without departing from the spirit thereof.

[Effects] (1) A cylinder tube in which a cut is formed in the axial direction, a piston located within the cylinder tube, and a piston provided on the outside of the side surface of the cylinder tube and connected to the piston through the cut. In a reciprocating sliding device comprising a table that is reciprocated in the axial direction of the cylinder tube, the pressure receiving surface of the piston is oval, and the pressure receiving surface of the piston is elliptical, and the pressure receiving surface of the piston is elliptical to guide the reciprocating movement of the table and to Because the structure is equipped with a guide bar that supports the load, the cross-sectional shape of the cylinder tube in which the piston is housed is flattened, making the device more compact, and the cross-sectional area of the cylinder tube is effectively used to accommodate the piston. The pressure-receiving area is large, and a relatively large thrust force can be obtained on the table.

Furthermore, since the lateral load acting on the table is borne by the guide bar, it does not act directly on the piston or the like, increasing the rigidity of the device. As a result, the table can be driven quickly and smoothly without vibration, play, or galling, even when the applied load and table movement speed are relatively large, or when a lateral load is applied to the table. be able to.

(2) As a result of the above (1), no more than necessary load is applied to the gasket attached to the piston, and the reliability and durability of the gasket are improved.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway sectional view of a reciprocating sliding device that is an embodiment of the present invention, and FIG. 2 is a sectional view of the portion indicated by a line in FIG. 3 is a cross-sectional view of the portion indicated by a line, FIG. 4 is a cross-sectional view of the portion indicated by a line, and FIG. 5 is a plan view thereof. 1... Cylinder tube, 2, 3... End plate, 4, 5... Y packing, 6, 7... Piston, 8... Piston holder, 9, 10... Pressure port, 11, 12... Y packing , 13...cutting, 14...connecting tool, 14a...sliding bearing, 1
5...Table, 16...Spring pin, 1
7, 18... Guide bar, 19... Inner seal band, 20... Outer seal band, 21a,
21b... Support plate, 22a... Screw, 23a, 2
3b...Permanent magnet, 25, 26...Buffer.

Claims (1)

[Claims for Utility Model Registration] (1) A cylinder tube in which a cut is formed in the axial direction, a piston located within the cylinder tube, and a piston provided on the outside of the side surface of the cylinder tube, through which the cut is formed. A reciprocating sliding device comprising a table connected to a piston to reciprocate in the axial direction of the cylinder tube, wherein the pressure receiving surface of the piston is oval, and the table has a A reciprocating sliding device characterized by being provided with a guide bar that guides reciprocating motion and supports lateral loads. (2) The reciprocating sliding device according to claim 1, wherein the reciprocating sliding device is a rodless cylinder.