JPS5984014A - Partial dry type underwater cutting method - Google Patents

Abstract

PURPOSE:To improve the reliability and efficiency of a cutting operation by making a cutting section lie in a clean and dry atmosphere by a method wherein a bag-shaped heat resistant skirt is provided around the top end of a cutting torch and a gas is supplied into the skirt to thereby form a partition wall for shielding water from outside. CONSTITUTION:Compressed air is supplied into the bag-shaped space provided by the heat resistant plastic skirt 2 through the gas supply nozzle 3 so that the skirt expands to form a partition wall 5 and at the same time, the compressed air is supplied continuously inside the partition wall 5 to thereby increase the pressure inside the wall 5. As a result, a dry atmosphere is produced within the partition wall and a copper plate 4 is cut by a plasma arc cutting torch 1. In this case, a secondary waste material 6 generating during cutting is removed by being thrusted toward the rear surface of the copper plate 4 from a cutting slit 7. Therefore, it is possible to cut the copper plate 4 accurately and easily while the cutting operation is watched by an underwater lighting device provided inside the partition wall 5, to keep clean the cutting section of the copper plate before cutting, to perform a preparatory cutting operation easily and to improve the reliability of the cutting operation to thereby increase the working efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention, in underwater cutting, - 1 tile, 1 t, 1 object.
Cut the cut section with a dry paper under ambient conditions.
-B) Section 17 introduces the divisional underwater cutting method.

Conventionally, when cutting underwater is carried out using a thermal cutting method, the secondary material produced by cutting is beef meat.

The result J11・The surrounding water) will turn into a heel Tachibana 1, and underwater 1; cutting work and U1 month 1 no 1] 1llI! The supervisor of the preparatory school is in the middle of winter.

This invention is like this! +! 11￥Solution-I
That is, Nakiri I'! Place where R objects are placed; τ1 ~ Create a clean dry atmosphere and monitor thoroughly 1. The present invention aims to provide a complete partial dry underwater cutting method that eliminates cutting work and its preparation work.

Below is a practical example of the partially dry underwater cutting method according to the present invention.
1 by H,! ? , 1 pl-. 11-This book describes the device for performing ritual rituals.
The tip of a plasma arc cutting torch l, which is an example of thermal cutting equipment, is wrapped around the circumference (2). From the outer periphery of ((t, 111 gas supply/Sur R cap installation/) to the outer circumferential surface of the tip of the second gas and the second supply nozzle 8, the scar of the bag 1 is connected to the scar) 2. and are combined f.

Next, when the above structure is installed: S-, the partially dry underwater cutting method of the present invention to be used is shown in the figure F)1, and the underwater fracture 1
When cutting an Ir material such as a steel plate 4 ff, gas is released from the bag of the skirt 2 (・?- from the gas supply nozzle 8).
11 Inflate the tube by supplying compressed air to form a partition wall 5 that blocks external water. At the same time, compressed air is continuously supplied to the inside of this partition 5, and 1EK of water is supplied to the outside of the partition 1j, e5. The strength of the inner side 1 of the partition wall 5 is increased so as to provide stiffness for water on the back side of the plate 4.Thus, the inside of the partition wall 5 becomes a dry atmosphere, and the steel plate 4 is exposed to plasma-γ- in the dry atmosphere.
7JI! ', I'i expression],
The secondary waste 6 that is crushed during cutting is transferred from the cutting slit 7 to vI4.
Extrude -I to the back side of plate number 0 and remove ↓1 [, creating a soaked dry atmosphere. Therefore, the inside of the partition wall 50 is
The 41 plates 4 can be accurately and clearly cut and analyzed with a Blazuma arc cutting 1-chill while being sufficiently monitored using a water filtration lighting device, a TV camera, etc. (not shown). Of course, since a clean dry atmosphere can be maintained near the IJ cutting section of the steel plate number μIQ nil, the cutting process can be easily carried out.

In the above embodiment, the bag-shaped skirt) Z and this skirt 2
The gas is supplied from a common gas supply nozzle 8 to the partition wall 5 formed by the gas flow rate.

As can be seen from the above explanation, the partial dry underwater cutting method of Kibatsu QIJ is performed by keeping the -J section of the moon 11 specimen in a clean dry π atmosphere at all times. Since cutting work and preparation work can be done while
There are great things that contribute to efficiency by reducing the time required for cutting 1j'T products in water (improving the reliability of 1j'T products (b) and improving the cutting ability (c) and reducing the time required for cutting IIJ.

[Brief explanation of drawings]

The figure is approximately 1 yen showing an example of the partially dry 1-underwater υJ cutting method according to the present invention. ■...Plasma arc tg Jl (R1-chi 2,...
・Bag-shaped skirt 8...Gas supply nozzle 4. ...
Steel plate 5... Bulkhead 6... Cutting causes secondary waste 7... (J1 cutting slit applicant Kawasaki 2-pointed 1'L ceremony 71 agent Patent attorney High JIt next section

Claims (1)

[Claims] A bag-like rigid skirt is installed around the tip of a thermal cutting device, and when cutting an object underwater, gas is released inside the skirt bag. r-Jt one person to form a bulkhead to shut off water and metal from the outside [7. Supply compressed gas from around the leg joint to the inside of this bulkhead to cut the part to be cut (= near J) A partially dry underwater cutting method characterized by cutting an object to be cut using a thermal cutting device in a dry atmosphere.