JPS63303205A - Pneumatic/hydraulic elevating device - Google Patents

Abstract

PURPOSE:To smoothly elevate articles by connecting an air source through a changeover valve to an oil tank which is connected to a hydraulic cylinder through a check valve and providing a shut-off valve between the hydraulic cylinder and the oil tank. CONSTITUTION:A piston 35 is provided in the inner tube 30a of a cylinder 30 and the oil tank of a chamber 40 is connected to a lower cylinder chamber 43 through a check valve 42. An outer tube 30b is connected to a changeover valve 50, a pressure reducing valve 51 and a pneumatic source 52, and, the lower end of the lower cylinder 43 and the lower end of the chamber 40 are connected to each other through a flow regulating type shut-off valve 49. Compressed air is supplied to the chamber 40 from the pneumatic source 52 by closing the shut-off valve 49 and switching the changeover valve 50 to move up and down a vacuum pad 38 to which articles are attached. When the shut-off valve 49 is opened, the amount of oil in the lower cylinder 43 is controlled to lower the piston 35 at a safe speed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pneumatic hydraulic lifting device, and particularly to a pneumatic hydraulic lifting device for raising an article following its own rise and lowering the article safely without causing it to fall. The present invention relates to a new pneumatic and hydraulic lifting device that can be used.

[Background of the invention and its problems]

In the bending press, the plate material is placed on a concave lower die.

By pressing the convex upper mold against the lower mold, the material is bent by the two molds, and at this time, the portion of the plate material that protrudes from the bent portion springs up. This fly-up of the board is not a problem if the amount of overhang from the folded part to the end of the board is short, but if there are multiple products or products, the amount of fly-up becomes large and the upper mold is opened after folding. When this happens, the part that has sprung up may fall, which is dangerous.

If the plate material is relatively thin and has a long overhang, the plate material will bend at the edge of the lower mold or in the middle, resulting in an unfinished finish and, furthermore, the raised portion may fall.

The present invention allows the object itself to rise smoothly, such as the above-mentioned lifting of the board, without causing it to fall.
The object of the present invention is to provide a pneumatic hydraulic lifting device that can be lowered safely.

[Failure to solve the problem]

The present invention provides a hydraulic cylinder for raising and lowering articles, an oil tank formed to be sealed against the atmosphere and connected to the hydraulic cylinder through a check valve, and an oil tank connected to the oil tank through a switching valve. with a pneumatic source.

The air-hydraulic lifting device consists of an on-off valve connected between a hydraulic cylinder and an oil tank.

[For production]

When the on-off valve is closed and compressed air is supplied to the oil tank from a pneumatic source, the oil in the oil tank is supplied by the pneumatic pressure to the hydraulic cylinder via the check valve, giving a lifting force to the article.

At this time, if you set the pneumatic pressure value as high as possible without lifting the item depending on the pressure,
When a lifting force is generated on the article itself, the article is lifted by the sum of this lifting force and the output of the hydraulic cylinder due to the air pressure. Even if the lifted object loses its own lifting force, the check valve prevents oil from being discharged from the hydraulic cylinder, so it will not fall.

When the article is lifted up, the oil tank is disconnected from the air pressure source and released to the atmosphere by switching the switching valve.

Safely descend by opening the on-off valve.

〔Example〕

1 and 2 showing one embodiment of the present invention will be explained below.

1 is the main body of a bending press to which the air-hydraulic lifting device of the present invention is applied, and a lower mold 8 is attached to a lower mold holder 2. A guide 4 extending vertically is provided on the main body 1, and a slider 5 is attached to the main body 1 so as to be movable vertically. The slider 5 is connected to a piston rod 7 of a cylinder 6 attached to the upper part of the main body l.

8 is a lock nut. An upper die mounting arm 9 is attached to the slider 5, and an upper die 10 is attached to the lower end of this upper die attaching arm 9. The lower mold 8 has a V-shaped groove extending perpendicular to the paper surface of FIG.
It has a chevron that is paired with a groove.

The plate material 11 placed between these is bent as shown by the two-dot chain line.

80 is a cylinder of the pneumatic hydraulic lifting device according to the present invention.

This cylinder 80 is set by a clamp 82 at an arbitrary position on a rail X provided in front of the main body 1 of the bending press, and In the figures and FIG. 2, it is installed so as to be tiltable to the left. Incidentally, the rightward inclination of the cylinder 30 is limited by a stopper surface 84 shown in FIG. 2, so that the cylinder 30 stands on its own at a position slightly inclined to the right from the vertical state.

The cylinder 80 has a double structure, as shown in FIG. An inner tube 80a of the cylinder 80 functions as a so-called cylinder, and the piston 35 is provided within this inner tube 80a. A vacuum hole 88 is attached to the upper end of the piston rod 86 via a hinge 37, and is adapted to attract the lower surface of the plate 11. 39 is a suction hose.

Chamber 40 between inner tube 30a and outer tube 80b of cylinder 80
forms an oil tank, the lower end of which is connected to the lower cylinder chamber 43 in the inner pipe 80a via the opening Φ1 and the check valve 42.
is communicated with. Note that the upper cylinder chamber 44 is opened to the atmosphere through a small hole 5. A switching valve 50 is connected to the upper end of the outer pipe dab via an air hose 46. A pressure reducing valve 51 and an air pressure source 52 are connected to supply compressed air into the chamber 40 . The lower end of the lower cylinder chamber Φ3 and the lower end of the chamber 40 are connected via a pipe 4.7.48 and a flow rate regulating valve Φ9.

Next, the operation of this device will be explained. When bending the plate material 11, the lower surface of the plate material 11 is sucked by a vacuum pad 38, an on-off valve 49 is closed, a switching valve 50 is switched, and compressed air is supplied from a pneumatic source 52 to the chamber 40 by an air hose 6. The oil in the chamber 40 is drained through the opening 41 at the lower end by supplying compressed air.
and is supplied to the lower cylinder chamber 48 via the check valve 42, but the pushing up force acting on the piston 85 is
1, it is determined that the plate material 11 cannot be pushed up by itself. Therefore, the plate material 11 is not pushed up, and if there is any deflection, it is only removed. Next, when the plate material 11 is bent by the two molds 8 and 10, the plate material 11 is pushed up by the sum of the springing force of the plate material 11 accompanying this bending and the pushing up force of the piston 85.

When the bending is completed, switch the switching valve 50 to open the chamber 40.
The supply of compressed air to the chamber 40 is stopped to open the chamber 40 to the atmosphere, and the on-off valve 49 is opened as the upper die 10 rises. By opening this on-off valve 49, the oil in the lower cylinder chamber 48 is returned to the υ chamber 40 by the gravity of the plate 11 and the piston 85, while the flow rate is controlled, and the piston 85 is lowered at a safe speed. The raised plate material 11 is lowered.

Although the above-mentioned embodiment shows an example in which the plate material 11 is supported by the vacuum pad 88, various support parts such as a mechanical lamp or a magnetic support part can be adopted, It is needless to say that the structure can be modified in various ways, such as by connecting an ordinary box-shaped structure to the cylinder or inner tube 30a, regardless of the double-tube structure.

〔Effect of the invention〕

As described above, the pneumatic hydraulic lifting device of the present invention is provided.

It can be bent because it allows the item to follow its own rise without applying excessive force to the item, and it can be lowered safely as the item often falls. It is useful as a means for supporting the raised portion of a plate material, and has various utility values.

[Brief explanation of drawings]

FIG. 1 is a side view showing one embodiment of the present invention, and FIG. 2 is a side view showing one embodiment of the present invention.
FIG. 3 is an enlarged cross-sectional view of the cylinder shown in the figure. l... Main body of the bending press, 3... Lower die, 10.
・Upper mold. 11... Plate material, 80a... Inner tube (cylinder), 4o
...Chamber (oil tank), 42...Check valve, 49...
On-off valve, 50... switching valve. 51...Pressure reducing valve, 52...Pneumatic pressure source.

Claims (1)

[Claims] A hydraulic cylinder for raising and lowering articles, an oil tank formed to be sealed against the atmosphere and connected to the hydraulic cylinder via a check valve, and a pneumatic cylinder connected to the oil tank via a switching valve. An air-hydraulic lifting device comprising a power source and an on-off valve connected between the hydraulic cylinder and the oil tank.