JPS6229682Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cylinder equipped with a diaphragm, a so-called diaphragm type cylinder.

The diaphragm type cylinder 10 is used, for example, in a simple cobot (for example, a balancer) for frying and grating a workpiece 11 in a factory or the like, as shown in FIG.
A type of air cylinder used in devices that can lift a workpiece into the air by generating axial force when air is injected into the cylinder, allowing a person to move the workpiece to a required position with a small amount of force. be. A diaphragm type cylinder is preferably used because it does not have a frictionally sliding part during operation unlike a piston cylinder type air cylinder.

A conventional diaphragm type cylinder is shown in FIG. 1 (shown in cross section). That is, in the figure, 1 is a diaphragm, 2 is an outer cylinder with a lid 3, 4 is an inner cylinder with a lid 5 and a rod 6, and the diaphragm 1 is kept airtight at parts 1a and 1b by a known method. Can be attached. Although not shown in the drawings, the air port 7 is connected with piping from the outside to suck and exhaust air into the air chamber 8.

FIG. 2 is a diagram showing the state of the diaphragm when the diaphragm type cylinder shown in FIG. 1 is operated.

In FIG. 2, the air supply valve 10 is opened and the exhaust valve 1 is opened.
1 is closed and air is supplied from the air port 7, the diaphragm type cylinder rolls on the surfaces of the outer cylinder 2 and the inner cylinder 4, as shown in Fig. 2b, while the diaphragm 1 is under tension outward as shown in 1c. As a result, the inner cylinder 4 is pushed out. Next, from the state shown in Fig. 2b, close the air supply valve 10, open the exhaust valve 11, and push the inner cylinder 4 into the outer cylinder 2 while exhausting air from the air port 7. The state shown in Fig. 1 will be restored and the cylinder will function as a cylinder. Complete one step.

By the way, in FIG. 2, when the inner tube 4 is pulled by an external force other than air supply while the air port 7 is closed, the internal volume of the air chamber 8 of the diaphragm 1 increases, resulting in negative pressure. The diaphragm 1 has sufficient strength to withstand outward tension, but has little resistance to inward negative pressure, and is easily folded inward as shown in 1d of Figure 2a. Therefore, when the inner cylinder 4 is pushed in next time, the diaphragm 1 cannot restore itself as shown in Fig. 1, and is caught between the outer cylinder 2 and the inner cylinder 4, causing abnormal deformation and subsequent operation. I end up not being able to do it anymore. Sometimes the diaphragm 1 may be damaged.

The present invention solves the above problems. The following will describe FIG. 3, which is a cross-sectional view of the diaphragm type cylinder of the present invention.

The constituent parts 1 to 8 are the same as the conventional one, but in the present invention, a check valve 9 is further attached to the lid 5 of the inner cylinder 4. This check valve 9 acts as a stop valve when the internal pressure of the air chamber 8 is higher than the outside air pressure, and does not allow air to pass through, but when the internal pressure of the air chamber 8 is lower than the outside pressure (that is, becomes negative pressure), it sucks in air and allows it to pass through. It is characterized by being attached to.

The above-mentioned check valve 9 may be attached to the lid 3 of the outer cylinder, but if the check valve 9 protrudes from the surface of the lid 3, it may be damaged by foreign objects.
It is a good idea to use the inner space of

As a result, in the diaphragm type cylinder of the present invention, under the so-called normal use of air intake and exhaust from the air port 7, the internal pressure of the air chamber 8 is always higher than the external pressure, so the diaphragm 1 performs normal rolling motion. The check valve 9 also functions as a stop valve without allowing air to pass through.

On the other hand, when equipment using a diaphragm type cylinder is being transported before installation or is stopped, the air chamber 8 is not pressurized and is at atmospheric pressure, and the air port 7 is closed. When the diaphragm type cylinder is stroked to the tension side by some external force while the air is not being supplied, the air chamber 8 attempts to become a negative pressure, but the check valve 9 immediately operates and sucks in air. Therefore, as a practical matter, the air pressure 8 will never become negative pressure.

Therefore, the diaphragm 1 is also shown in FIG.
The rolling operation can be performed normally as shown in 1c of FIG. 2b without abnormal deformation as shown in 1d of FIG.

Since the diaphragm type cylinder is used for the purpose mentioned at the beginning, people may accidentally raise and lower the base of the lever when it is not in operation, so this invention is particularly important to prevent a vacuum from forming inside the diaphragm. It is.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional diaphragm type cylinder, Figure 2 is a diagram showing the state of the diaphragm when the conventional diaphragm type cylinder of Figure 1 is operated, and Figure b is a diagram showing the state of the diaphragm when air is supplied from the air port. When, figure a
When the inner cylinder is pulled by an external force other than air supply,
FIG. 3 each illustrates a cross-sectional view of the diaphragm type cylinder of the present invention. Note that FIG. 4 is a diagram for explaining the purpose of use of the diaphragm type cylinder. 1... Diaphragm, 2... Outer tube, 3... Lid, 4... Inner tube, 5... Lid, 6... Rod, 7
...Air port, 8...Air chamber, 9...Check valve, 10
...Air supply valve, 11...Exhaust valve.

Claims (1)

[Scope of utility model registration request] A cylinder in a cargo lifting and lowering device that uses rolling deformation of the diaphragm to stroke the inner cylinder while a diaphragm is attached to the outer cylinder and the inner cylinder to make it airtight and internal pressure is applied.
A diaphragm characterized in that a check valve is attached to at least one of the outer cylinder and the inner cylinder to prevent deformation of the inside of the diaphragm so that air can flow in when the air chamber formed by the diaphragm becomes negative pressure. equipped cylinder.