WO1992020927A1

WO1992020927A1 - Multi-stage pneumatic cylinder

Info

Publication number: WO1992020927A1
Application number: PCT/JP1991/000661
Authority: WO
Inventors: Shoroku Takatori
Original assignee: Asahi Seiko Co., Ltd.
Priority date: 1991-05-15
Filing date: 1991-05-15
Publication date: 1992-11-26

Abstract

A double-acting telescopic type pneumatic cylinder having a simplified construction, wherein a first stage is operated by a circuit similar to the conventional one, and a second and subsequent stages are each provided with a flowout hole for allowing the air to be discharged to the outside when the movable cylinder is operated.

Description

Description Multi-stage pneumatic cylinder

Technical field

INDUSTRIAL APPLICATION This invention is applied to various fields, such as an industrial machine, a conveyance machine, an automatic device, and a robot. Background art

Conventionally, all machines, including industrial machines, transport machines, automatic devices, and robots, use compressed air with a structure consisting of cylinders, pistons, and piston rods (hereinafter referred to as rods). So-called pneumatic cylinders are used everywhere. This type of pneumatic cylinder has the advantages of a simpler mechanism and a higher operating speed than similar cylinders that are hydraulically or motor-driven.

However, this type of pneumatic cylinder connects a rod to a piston that reciprocates in the cylinder, reciprocates the rod in its axial direction, and places the tip of the rod at one end of the cylinder. Since it reciprocates outside the cylinder, the movable distance of the rod tip, that is, the stroke, cannot be longer than the length of the cylinder.

Therefore, the use of a pneumatic cylinder always requires at least a place for the cylinder to be installed, at least as long as the required stroke.

A variant of this defect is called a rodless pneumatic cylinder. The rodless pneumatic cylinder attaches to the piston a protruding piece protruding outside the side of the cylinder, and this protruding piece moves with the piston in the axial direction of the cylinder. This is a structure with a seal, etc., that keeps airtightness.This is a complicated structure. is necessary. A pneumatic cylinder consisting of a cylinder, a piston, and a rod.Another cylinder, which is pre-integrated in the cylinder, extends beyond one end of the cylinder and extends in the axial direction. With the same style of actuation, you can get in and out of one end of this other cylinder, and if you let the rod in and out, you get a stroke that is almost twice that of the first cylinder (hereafter called the fixed cylinder). be able to. Similarly, if a multi-stage pneumatic cylinder is formed by superimposing a second and a third separate cylinder (hereinafter referred to as a movable cylinder), the stroke is several times the length of the fixed cylinder. Can be obtained.

Even if the movable cylinder and rod can be protruded out of the fixed cylinder by pneumatic pressure, it is desirable to have a method of securely and quickly inserting the movable cylinder and rod into the fixed cylinder. However, the one provided with the mechanism for that has not been provided so far.

Therefore, the installation site of the pneumatic cylinder is always considered to be a necessary waste, and is not considered. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an explanatory diagram of a two-stage pneumatic cylinder structure according to the present invention, FIG. 2 is an explanatory diagram of its operation, and FIG. 3 is an example of an application of a multi-stage cylinder according to the present invention. FIG. 4 is an explanatory view of a double-ended three-stage cylinder. DISCLOSURE OF THE INVENTION AND BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 is an explanatory diagram of a multi-stage pneumatic cylinder of the present invention. Here, a case of a two-stage pneumatic cylinder is shown, and a movable cylinder is provided in a fixed cylinder (1). This shows a state in which both (2) and the biston rod (3) are trapped.

In this description, when an end of a cylinder, a rod, or the like is shown, an end of the movable cylinder or the entrance of the rod, that is, a head, as shown in FIG. The side is called the left end.

A movable cylinder (2) that can move in the axial direction is provided inside the fixed cylinder (1) that has ensured airtightness, and a piston rod (2) is provided inside the movable cylinder (2). 3) There is.

Near the left end and right end of the fixed cylinder (1), compressed air (hereinafter, referred to as air) ports (4) and (5) are formed, respectively. The movable cylinder (2) has an outer periphery near its left end and a piston (2) that can slide in the axial direction on the inner surface of the fixed cylinder (1). Since 6) is attached, the movable cylinder (2) can be pushed out of the fixed cylinder (1) by the force air. In addition, near the right end of the inner surface of the fixed cylinder (1), there is a stopper (7) for the piston (6). The shape of the slide stopper (7) may be arbitrary.

Note that the position of the cylinder, piston, and air inlet and outlet in the conventional pneumatic cylinder is the same as that of the conventional air-pressure cylinder.

(4) is always at the left end side from piston (6), and the air inflow near the right end (5) is the piston when stopped by the non-slip (7).

Must always be on the right side of position (6).

The piston rod (3) connected to the piston (8) operates inside the movable cylinder (2). Air inlet / outlet holes (9) and (10) are formed near the left end and near the right end of the movable cylinder (2), respectively. The area near the left end may be left open. In such a case, it is not always necessary to form the air inlet / outlet (9). In addition, near the right end of the inner surface of the movable cylinder (2), a piston of an arbitrary shape is provided.

The slide stopper (11) of (8) is installed. The air inlet / outlet (10) is the piston when stopped by the slide stopper (11).

Must be located on the right end side of position (8).

As can be seen from the above, the structure of the movable cylinder (2) is a fixed cylinder.

It is substantially the same as the structure of (1). In FIG. 1, the left end of the fixed cylinder (1) and the left end of the movable cylinder (2) are used as stoppers for the left end of the piston (6) and the piston (8). A bottom is applied, but unlike in such a method, a separate slide stop may be provided, or a stop may be provided by a movable cylinder (2) or a piston rod (3). As such, a collar may be attached to the right end of them.

Next, the operation of the multi-stage pneumatic cylinder of the present invention will be described with reference to FIG.

Since Fig. 2 is for explanation of the operation situation, the drawing is simplified compared to Fig. 1, but Fig. 2 (a) (e) and Fig. 1 are in the same state. With this in mind, the contents of the drawing in Figure 2 will be fully understood.

In FIG. 2 (a), the movable cylinder (2) and the piston rod (3) are both contained in the fixed cylinder (1). In operation, first, adjust the air valve (12) so that air is injected into the air inlet / outlet (4) and air can be ejected from the air inlet / outlet (5). Transition to the states of b) and (c). Fig. 2 (b) shows the state where only the movable cylinder (2) protrudes from the fixed cylinder (1), and Fig. 2 (c) shows that the piston rod (3) is movable. This shows a state in which it protrudes from the cylinder (2).

Therefore, this stroke is almost twice the length of the fixed cylinder (1). That is, in the case of the fixed cylinder (1) having the same length, the pneumatic cylinder having the structure of the present invention has a stroke approximately twice as large as that of the conventional pneumatic cylinder.

In addition, the jet air from the movable cylinder (2) due to the piston rod (3) being pushed out of the movable cylinder (2) flows through the air inlet / outlet port (10). , Squirt into the outside air.

Next, when the piston rod (3) and the movable cylinder (2) are stored in the fixed cylinder (1) from the state shown in Fig. 2 (c). First, press the air in through the air inlet / outlet (5).

According to (4), when the air valve (12) is adjusted so that air can be blown out, the state shifts to the state shown in Fig. 2 (d). That is, the air that has entered through the air inlet / outlet port (5) first pushes the piston (6) to move the movable cylinder.

Although (2) is performed, the positional relationship between the movable cylinder (2) and the piston rod (3) does not change. In the state shown in FIG. 2 (d), the air inlet / outlet (5) at the right end of the fixed cylinder (1) passes through the air inlet / outlet (10) at the right end of the movable cylinder (2). As a result, air is forced into the inside of the movable cylinder (2), and as a result, the piston (8) is pushed to the left, and the piston rod (3) is moved to the movable cylinder (3). 2), the movable cylinder (2), piston rod (3) and force s are inserted into the fixed cylinder (1) as shown in Fig. 2 (e). . Since the state in FIG. 2 (e) is the same as the state in FIG. 2 (a), this means that one cycle of the pneumatic cylinder has been completed.

The length of the stroke can be arbitrarily adjusted depending on the mounting positions of the pistons (6) and (8) and the stoppers (7) and (11) of the piston. The operating speed is controlled by air pressure, air inlet / outlet (4),

(5), (9), and (10) are adjusted according to the shape and dimensions of the holes. Further, the number of air inlet / outlet ports (9) and (10) of the movable cylinder (2) is not necessarily limited to one, and this number also affects the operation speed.

In FIG. 2, when air is injected into the air inlet / outlet (4), only the movable cylinder (2) first protrudes, and then the piston rod (3) protrudes. As described above, due to the difference in the ease of sliding between the piston (6) and the piston (8), the piston rod (3) protrudes, and then the movable cylinder (3) protrudes. 2) may protrude, or both may protrude simultaneously.

When the combination of the fixed cylinder (1) and the movable cylinder (2) is superimposed to make two or more movable cylinders (2), the above operation is also superimposed, A multi-stage pneumatic cylinder with a stroke several times that of the fixed cylinder (1) can be obtained. The stroke of the pneumatic cylinder having n movable cylinders (2) is approximately n + 1 times the length of the fixed cylinder (1). It is called a cylinder.

FIG. 3 shows the structure of a double-headed three-stage pneumatic cylinder as an example of the application of the present invention where a movable cylinder and a piston rod enter and exit from both ends of a fixed cylinder.

When air is injected from the air inlet / outlet (24) at the center of the fixed cylinder (21), two movable cylinders (22), (22 ') and (22a) (2 2 2 a ') and piston rods (23),

(2 3 ') protrudes, and its stroke is about three times as large as that of the fixed cylinder (21). Then, the air inlet and outlet holes (25) near both ends of the fixed cylinder (21) are projected. The operation of this will be easily understood from the drawing, such as returning to the original state when air is injected from () and (25 ′). Industrial applicability

Unlike the conventional pneumatic cylinder, the multi-stage pneumatic cylinder according to the present invention can obtain a stroke several times as large as that of the cylinder, thus greatly contributing to a compact machine.

Claims

Scope of request 1. There is a fixed cylinder with holes near both ends to allow compressed air to enter and exit, and a pneumatically operated piston between these holes. Instead of a piston rod of a pneumatic cylinder mechanism that moves in and out of the fixed cylinder from one end of the fixed cylinder, the cylinder has substantially the same structure as the fixed cylinder, and has a piston inside the cylinder. There is a movable cylinder that has a ton and a piston rod and can move in and out of one end of the fixed cylinder in the axial direction, and compressed air is supplied only to holes near both ends of the fixed cylinder. A two-stage pneumatic cylinder with a stroke that is longer than the length of the fixed cylinder that can be activated simply by connecting it to the device.

A multi-stage pneumatic cylinder that combines the combination of the fixed and movable cylinders of the two-stage pneumatic cylinder described in 1.