JPS629006A - Cylinder device - Google Patents

Abstract

PURPOSE:To carry out two different actions in an optional position of a stroke, by making a first piston rod penetrate into a second piston rod slidably in the axial direction. CONSTITUTION:A piston 7 is provided in a cylinder 3 to form fluid chambers L1 and R1, while a piston 10 is provided in a cylinder 4 to form fluid chambers L2 and R2. A piston rod 13 is provided in order to penetrate insides of a piston rod 14 and the piston 10 slidably in the axial direction. Therefore, the piston rods 13 and 14 can move in the same direction or reverse directions to each other in an optional position of a stroke, so that two different actions can be carried out at the respective optional positions of stroke of the piston rod.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a technique that is effective when applied to a cylinder device, particularly a cylinder device having a plurality of pistons and piston rods driven by fluid pressure.

[Background Art] As a cylinder device having a plurality of pistons and piston rods driven by fluid pressure, for example, a telescope with a telescopic piston rod is used for the purpose of obtaining a long stroke length with a relatively short body length. 2. Description of the Related Art A so-called telescope-type multi-stage cylinder device that is configured in multiple cylindrical shapes is known.

However, in the telescope type multi-stage cylinder device as described above, the length of the cylinder body is relatively short.
It has the advantage of being able to apply thrust over a long stroke, but the piston rod, which is configured in multiple ways, simply applies thrust in one predetermined direction, so it can only perform one task, and it can only perform multiple tasks. A disadvantage is that the plural piston rods constructed cannot realize complex movements in relation to each other.

[Object of the Invention] An object of the present invention is to provide a cylinder device that allows a plurality of coaxially provided piston rods to perform two different operations at arbitrary positions on the stroke.

[Summary of the Invention] The present invention includes a cylinder device including first and second cylinders arranged in series, each of which is located within the first and second cylinders and is movable independently of each other in the axial direction. first and second pistons, and first and second piston rods connected to the first and second pistons, respectively, wherein the first piston rod is connected to the second piston.
The first and second piston rods have a structure that allows them to slide through the piston and the second piston rod in the axial direction.
The piston rods of the piston rods can be moved in the same direction and in opposite directions at any position on the stroke, thereby making it possible to perform two different operations at any position on the stroke.

[Example] The figure is a sectional view of a cylinder device that is an example of the present invention.

Cylinder 3 (first cylinder) and cylinder 4 (second cylinder) each have a rod guide part 1 and a rod guide part 2 formed at one end, respectively. By being inserted into the open end, they are arranged coaxially and in series, and are integrally configured by a fixing screw (not shown).

Further, the open end of the cylinder 3 is closed by inserting an end plate 5, and the end plate 5 is supported by a fixing plate 6 fixed to the cylinder 3.

Inside the cylinder 3 whose open end is closed by the end plate 5, there is a piston 7 (first piston 7) which is slidable in the axial direction.
The inside of the cylinder 3 is partitioned by the piston 7, so that a fluid chamber L1 and a fluid chamber R1 are formed on the left and right sides of the piston 7.

The piston 7 is configured to reciprocate by alternately applying compressed air pressure or the like from outside the cylinder 3 through a pressure boat 8 and a pressure boat 9, which are communicated with the fluid chambers L1 and R1, respectively.

Similarly, inside the cylinder 4 whose open end is closed by inserting the rod guide part l of the cylinder 3,
A piston IO (second piston) that is slidable in the axial direction is provided, and the inside of the cylinder 4 is partitioned by a piston 10, so that a fluid chamber L2 and a fluid chamber R2 are formed on the left and right sides of the piston 10.

Then, the cylinder 4
The piston IO is configured to reciprocate independently of the piston 7 by alternately applying compressed air pressure or the like from the outside.

In this case, the piston rod 13 (first piston rod) connected to the piston 7 located inside the cylinder 3 is connected to the piston lO1 located inside the cylinder 4 and this piston 10, and one end is connected to the piston 7 located inside the cylinder 4. The piston rod 14 (second piston rod) is configured to axially slidably pass through the inside of a piston rod 14 (second piston rod) that extends through the rod guide portion 2 of No. The piston rod 13 and the piston rod 14 can be moved relative to each other in the same and opposite directions at any position of the stroke by individually controlling the moving direction of the piston 7 and the piston IO to which they are connected. It is made freely movable.

An O-ring 15 is attached to the outer periphery of the end plate 5 to keep the inside of the cylinder 3 airtight.

Similarly, the cylinder 30 inserted into the open end of the cylinder 4
An O-ring 16 is attached to the outer periphery of the rod guide portion 1 to keep the inside of the cylinder 4 airtight.

In addition, an O ring 1 is attached to the outer circumference of the piston 7 and the workpiece 0.
7 and 0 ring 18 are installed, respectively, and the cylinder 3
Also, the sliding portion with the inner circumferential surface of the cylinder 4 is configured to be airtight.

The rod guide portion l through which the piston rod 13 passes, the inner peripheral portion of the piston 10, and further the piston rod I4
An O-ring 19, an O-ring 20, and an O-ring 21 are attached to the inner circumferential portion of the front guide portion 2 of the cylinder 4 through which the piston rods 13 and 14 pass, and the structure is such that the piston rods 13 and 14 maintain airtightness at the portions through which the piston rods 13 and 14 pass. ing.

Further, in this embodiment, since the cylinder 3 and the cylinder 4 are separable, for example, after the piston 10 and the piston rod 14 connected to the piston 10 are attached to the cylinder 4, the rod of the cylinder 3 is This can be easily done by inserting the guide part l into the opening of the cylinder 4, then inserting the piston 7 and piston rod 13 from the open end of the cylinder 3, and then attaching the end plate 5 or the like to close the open end of the cylinder 3. It can be assembled into

The operation of this embodiment will be explained below.

First, the cylinder device main body is mounted vertically on, for example, a robot arm (not shown) with the side from which the piston rods 13 and 14 are projected downward, and
Pressure boats 8 and 9 of cylinder 3 and cylinder 4
The pressure boats 11 and 12 are connected to a compressed air pressure source via a predetermined control valve (not shown) or the like.

A predetermined compressed air pressure is applied to the pressure boat 9 of the cylinder 3 and the pressure boat 12 of the cylinder 4, and the pistons 7 and 10 are urged to the left in the figure, that is, upward, and are connected to the pistons 7 and 10, respectively. The piston rods 13 and 14 are fixed in the direction in which they are drawn into the cylinder device main body.

Next, by parallel movement of the robot arm or the like, the axes of the piston rods 13 and 14 are moved, for example, to a central portion such as a seal ring (not shown) which is horizontally positioned at a predetermined position and whose inner diameter is approximately equal to the outer diameter of the piston rod 13. positioned upwards.

A predetermined compressed air pressure is applied to the pressure boat 8 of the cylinder 3, and the piston 7 and the piston loft 13 connected to the piston 7 protrude by a predetermined length from the tip of the piston rod 14 in the stopped state. At the same time, the entire cylinder device is lowered toward the seal ring located below, and the tip of the piston rod 13, which is in a state of protruding beyond the piston rod 14, is inserted into the seal ring, and the seal ring is inserted into the seal ring. It is held at the tip of 13.

Next, the cylinder device is raised and moved to another predetermined position by the robot arm, and the tip of the piston rod 13 is shaped into a cylindrical shape having approximately the same diameter as the piston rod 13 and to which the seal ring is to be attached. Coaxially abuts against the end face of a workpiece (not shown).

Then, with the piston rod 13 stopped, a predetermined compressed air pressure is applied to the pressure boat 11 of the cylinder 4, and the piston rod 14 is penetrated by the piston rod 13.
The tip of the piston rod 13 is moved in the direction of protruding relative to the piston rod 13, and the seal ring held at the tip of the piston rod 13 is moved to a predetermined position on the side of the workpiece to be attached. The installation of the seal ring is completed.

Next, the cylinder device is raised by the robot arm, and predetermined compressed air pressure is applied to the pressure boat 9 of the cylinder 3 and the pressure boat 12 of the cylinder 4, respectively, and the piston rods 13 and 14 are moved toward the inside of the cylinder device body. and is returned to its initial state.

In this way, at any position of the stroke of the piston rods 13 and 14, the piston rods 13 and 14
can move in the same direction and in opposite directions, and can perform two different operations at any arbitrary position on the stroke, making the above-mentioned complex operations possible.

Note that the present invention is not limited to the above-mentioned embodiments, and for example, the fluid pressure applied through the pressure boat is not limited to compressed air pressure, but may be pressurized oil or the like.

[Effects] (1) First and second cylinders arranged in series, and a first cylinder located within the first and second cylinders and movable independently of each other in the axial direction. and a second piston, and first and second piston rods connected to the first and second pistons, respectively, wherein the first piston rod is connected to the second piston and the second piston. Since the structure is such that the rod is slidably passed through the rod in the axial direction, the first and second piston rods can move in the same direction and in opposite directions to each other at any position on the stroke, and at any position on the stroke of the piston rod. It becomes possible to perform two different operations.

(2) Since the first and second cylinders are separable from each other, assembly and disassembly are easy, and the cylinder device can be manufactured and maintained easily.

[Brief explanation of drawings]

The figure is a sectional view of a cylinder device that is an embodiment of the present invention. 1.2... Front guide part, 3... Cylinder (first cylinder), 4... Cylinder (second cylinder), 5... End plate, 6... Fixing plate, 7. ... Piston (first piston), 8.9... Pressure boat, 10... Piston (second piston), 11.12.
...Pressure boat, 13...Piston rod (first piston rod), 14...Piston rod (second piston rod), 15.16.17...0 ring, 18.19,20. 21.--O-ring.

Claims (2)

[Claims] (1) first and second cylinders arranged in series, located within the first and second cylinders, respectively;
It consists of first and second pistons that are movable independently of each other in the axial direction, and first and second piston rods that are connected to the first and second pistons, respectively, and the first piston rod is A cylinder device, characterized in that the cylinder device is configured to slidably pass through the second piston and the second piston rod in the axial direction. (2) The cylinder device according to claim 1, wherein the first and second cylinders are separable from each other.