JPS59151667A - Piston type cylinder device for underwater - Google Patents

Abstract

PURPOSE:To prevent foreign object or the like from entering into a cylinder, by providing such an arrangement that the section of a piston rod which is outside of a cylinder cover, is surrounded by a projected chamber in which rust and corrosion preventing liquid is filled, and as well a scraper is arranged. CONSTITUTION:A cylinder 12 disposed underwater and having conduits 34, 40 which are connected to a pressurized fluid drive device arranged on the surface of the water, moves up and down a piston 14 and a piston rod 16 coupled thereto by pressure fluid introduced from the pressurized fluid drive device through one of the conduits 34, 40. Although the end part of the piston rod 16 which projects outward, is made into contact with the water, the section of the piston rod 16 which is retracted into a projected chamber 26 is protected with rust and corrosion preventing liquid 28. Further, a scraper 30 is arranged in the ent section of the projected chamber 26 through which the piston rod 16 moves into and out, and scrapes off underwater foreign object possibly adhered to the section of the piston rod 16 which projects into the underwater, thereby the object may not enter into the cylinder 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piston-type cylinder device, particularly to a piston-type cylinder device for underwater work.

For example, when drilling an oil well on the seabed, etc.
There is a need for a piston-type cylinder device for underwater work that is permanently disposed and operated underwater. However,
In this type of equipment, foreign matter in the water adheres to the piston rod and damages the sliding parts of the iron, and the iron is corroded by water, which hinders the operation of the cylinder device underwater and destroys the main parts. Due to the need for repair or replacement, there are many disadvantages in terms of work efficiency and economy, and sufficient development has not progressed.

In view of the above, the main purpose of the present invention is to provide a piston-type cylinder device for water work, which is ideal for working in seawater or in places where corrosive foreign substances are likely to adhere, such as in seawater or splash sheaths. It's about doing.

A further object of the invention is to provide means for protecting the piston rod in a piston-type cylinder device used in the locations mentioned above.

Another object of the invention is to provide a piston-type cylinder device for underwater work that is simple in structure and can operate accurately.

Next, a preferred embodiment of the piston-type cylinder device for underwater work according to the present invention will be described with reference to the drawings.

FIG. 1 shows the upper end of a piston-type cylinder device 10 for underwater work according to the present invention suspended from a support beam B of a workbench of a ship S working at sea and fixed to a columnar member C extending into the water.
It is a schematic diagram showing a case in which one end of the piston rod of the cylinder device 10 is attached to a member W to be driven vertically underwater, for example, a member that wedges a pillar P that has landed on the seabed on a ship body S.

FIG. 2 is a longitudinal sectional view for explaining the structure of the piston-type cylinder device 10 for underwater work according to the present invention, and the cylinder-type piston device 10 can slide vertically within the cylinder 12. It consists of a piston 14 and a piston rod 16 whose one end is fixed to the piston 14 by suitable means. The upper end of the cylinder 12 is fixed and closed by a lid 18 by suitable means such as welding.

A cover member 20 is fixed to the lower end of the cylinder 12. This cover member 20 has a piston rod 1 in its center.
The piston rod 1 is provided with an opening 22 through which the piston rod 1 passes.
One or more gaskets 24 are disposed on the contact surface between the opening 22 and the opening 22.

A projecting chamber 26 is provided integrally with the cover member 20 or fixed thereto, surrounding the piston rod 16 and extending downward. This protruding chamber 26 is a hollow chamber, and the inside thereof is filled with a rust-preventing and anti-corrosion liquid 28.

A scraper 30 is provided at the lower end of the protruding chamber 26,
It contacts the piston rod 16, and the piston rod 16 extends outwardly through this scraper 300 portion.

The upper end of the cylinder 12 is provided with an opening 32 which is connected by a conduit 34 to a pressure fluid power unit 36 located at a suitable location on the hull S, for example on the support beam B.

On the other hand, the lower end of the cylinder 12 is also provided with an opening 38 which communicates with the pressure fluid power unit 36 by a conduit 40.

The pressure fluid power device 36 is known per se;
Piston 14 of cylinder 12 via conduit 34 in cooperation with a suitably controllable valve arrangement (not shown).
By injecting pressure fluid into the upper side of the
4 and piston rod 16 downwardly, and pressurized fluid can be introduced into the underside of piston 14 of cylinder 12 via conduit 40 to force piston 14 and piston rod 16 upwardly. When pressurized fluid is forced into cylinder 12 through conduit 34, conduit 40 returns the pressurized fluid from the underside of piston 14 of cylinder 12 to pressurized fluid power unit 36, and vice versa. It goes without saying that pressure fluid is returned from above the piston 14 of the cylinder 12 to the power plant 36 via the conduit 34.゛The piston rod 16 is kept sufficiently tight by the packing 24 on the contact sliding surface of the opening 22 of the cover member 20, so that the pressure fluid in the cylinder 12 does not leak along the piston rod 16 and out of the opening 22. That's how it is.

Generally speaking, in the device of this invention, the piston rod 1
The part of the cylinder cover 20 of No. 6 that protrudes outward is surrounded by a rust-proofing and anti-corrosion liquid 28 filled in the protruding chamber 26 over a considerable length, and the piston rod 16 is The parts that protrude outward and come into contact with water and are pulled back into the protrusion member 26 are protected by a rust- and anti-corrosion liquid, and a scraper 30 is provided at the end of the protrusion chamber 26 where the piston rod 16 enters and exits the water.
Because of this, even if foreign matter in the water adheres to the part of the piston rod 16 that has plunged into the water, it will be scraped off by the scraper 30 during the process of being pulled back toward the ejection chamber 26, so that the inside of the ejection chamber 26, Furthermore, the cylinder 12
It doesn't get stuck inside.

Although this invention has been described by way of example in one preferred embodiment thereof, the device of this invention may be modified in many ways within the scope of the claims and may be modified in design. It can be changed.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram for explaining an embodiment of a piston-type cylinder device for underwater work according to the present invention, and FIG. 2 is a schematic cross-sectional view showing the main parts of the device according to the present invention. The relationship between reference symbols and main parts in the drawings is as follows. 10...Piston type cylinder device 12...Silling 14...Piston 16...Piston rod 18...Lid body 20...Cover member 26...Protrusion chamber 28...Rust prevention Anticorrosive liquid 30...Scraper 34, , 40...Conduit 36...Pressure fluid power device Fig. 1 Fig. 2 0

Claims (1)

[Scope of Claims] 1. A cylinder disposed underwater with both ends sealed; a piston capable of sliding within the cylinder; one end attached to the piston and the other end sealed at one end of the cylinder. a piston rod that protrudes from the end; a protrusion chamber that extends to surround the piston rod outside a sealed end wall on the extension end side of the piston rod of the cylinder; and a rust-proofing and anti-corrosion chamber that is filled in the protrusion chamber. the piston rod extends further outward from the other end of the ejection chamber, and a scraper is provided on a sliding surface between the ejection chamber and the piston rod; and a pressure fluid power device disposed on water. a first conduit communicating between the pressure fluid power device and one side of the piston of the cylinder; and a first conduit connecting the pressure fluid power device and the other side of the piston of the cylinder. and a second conduit for supplying pressure fluid from the pressure fluid power device to either side of the cylinder and removing it from the opposite side.