JPS6320455Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a gas cutting device for cutting the upper, lower, left, and right sides of a substantially rectangular parallelepiped steel piece at the same time.

Generally, impurities and scratches on the surface of a steel billet before rolling must be removed to prevent defects from occurring in the product after rolling. As an apparatus for cutting the upper, lower, left, and right sides of a steel piece using a gas flame, a structure shown in FIGS. 1 and 2 is conventionally known. This gas cutting equipment is suspended by a running trolley 1 running on running rails, and has a steel billet passage opening 2 in its center.
is formed, and the upper, lower, left, and right sides of the steel billet 3 passing through the billet passing port can be melted by the upper surface crater 4, the lower surface crater 5, the left side crater 6, and the right side crater 7. .

The steel piece passage opening 2 is a substantially square hole provided in the center of a plate-shaped main frame 8 hanging from the traveling carriage 1. An L-shaped plate-shaped upper vertical slider 9 is attached to the upper part of one side (the front side in FIG. 1) of the main frame 8 so as to be movable up and down, and an L-shaped plate-shaped lower vertical slider 10 is attached to the lower part. is attached so that it can move up and down.

The upper vertical slider 9 is arranged so that its L-shaped inner curved portion faces the upper and left side of the billet passage port 2, and the upper vertical cylinder 9 is attached to the left side of the traveling carriage 1. 11 to move it up and down.

The lower vertical slider 10 is arranged so that its L-shaped inner curved portion faces the lower and right side of the billet passage opening 2, and the lower vertical cylinder 10 is attached to the right side of the traveling carriage 1. 12 to move it up and down.

The upper and lower vertical cylinders 11 and 12 are related to vertically moving the upper and lower vertical sliders 9 and 10 located below, and the downward movement can be performed by the weight of each slider, as shown in FIG. 3. In this way, fluid pressure such as air or oil is applied only to the lower part of the piston 13, and the upper part of the piston 13 is opened to the atmosphere.

A plate-shaped upper horizontal slider 14 that supports the upper surface crater 4 and a plate-shaped left side slider 15 that supports the left side crater 6 are respectively attached to the upper vertical slider 9 so as to be movable in the horizontal direction. There is. The upper horizontal slider 14 and the left slider 15 are moved in the horizontal direction by an upper horizontal cylinder 16 and a left cylinder 17, which are fixed to the upper vertical slider 9, respectively.

A plate-shaped lower horizontal slider 18 supporting the lower nozzle 5 and a plate-shaped right side slider 19 supporting the right side nozzle 7 are attached to the lower vertical slider 10 so as to be movable in the horizontal direction. The lower horizontal slider 18 and the right side slider 19 are moved in the horizontal direction by a lower horizontal cylinder 20 and a right side cylinder 21 fixed to the lower vertical slider 10, respectively.

However, in the gas cutting apparatus having the above configuration,
The steel billet 3 flowing on the line passes through the steel billet passage port 2.
When approaching, actuate each cylinder to bring each crater (more specifically, the smoke of the crater) close enough to lightly touch the upper, lower, left, and right sides of the steel billet 3, eject gas flame from each crater, and open the billet passage port 2. The upper, lower, left, and right sides of the passing steel billet 3 can be simultaneously treated with a solvent. At this time, the lower surface crater 5 located on the passage line L of the lower surface of the steel billet 3 and the steel billet 3 strongly contact each other, so that the steel billet 3 is not damaged. Slab support rolls 22a and 22b are provided, and guide rolls 23a and 23b are provided above them.

By the way, in recent years, if a steel billet of the same weight is to be melt-cut, it is better to make it into a large rectangular parallelepiped shape with a smaller surface area and then process the steel billet by melt-cutting, which reduces the amount of material to be removed by welding and produces a product with less surface area. This method of melt-cutting steel slabs has begun based on the knowledge that it improves yield. However, in order to keep the weight of the rectangular parallelepiped steel piece the same as before, the length of the steel piece must be shortened. For example,
What used to be 4.5m or more long, becomes 3m or less when left in this condition. As a result, when a steel billet passes through the billet passage port during the solvent cutting process in the gas cutting apparatus, one end of the billet passes through the billet passing port.
or fall off from 22b, the lower surface crater 5,
In other words, the lower vertical slider 10 that supports the lower crater 5 upwardly is pushed down,
Misalignment occurs in the cutting position.

Therefore, in order to cope with this, the lower vertical cylinder 1 pulls the lower vertical slider 10 upward after each cylinder moves each crater to the correct position on each side of the steel billet during melt cutting.
2, it is necessary to supply high fluid pressure so that even if the weight of the short piece of steel is applied to the lower crater 5 below, the lower crater 5 does not shift downward.

However, in this case, since extra fluid pressure is applied to the lower vertical cylinder 12,
The lower surface nozzle 5 is somewhat displaced above the billet passage line L, and the pressure caused by the friction of the lower surface nozzle 5 with the shoe causes scratches on the lower surface of the steel billet.

This idea was made in view of the above circumstances,
The purpose is to provide a gas cutting device that can uniformly cut even short pieces of steel without damaging the bottom surface of the piece. By attaching a cylinder that applies a downward biasing force to the piston rod of the vertical cylinder, the lower crater is always positioned on the billet passage line while maintaining a biasing force sufficient to prevent the lower crater from descending due to the weight of the billet. It has been made possible.

This invention will be explained below with reference to the drawings. Figure 4 shows an embodiment of this invention, in which:
Components common to those in FIG. 1 are given the same reference numerals to simplify the explanation. In the figure, reference numeral 30 indicates a lower vertical cylinder that supports the lower vertical slider 10 and urges it upward. As shown in FIG. 5, this lower vertical cylinder 30 is configured such that fluid pressure is supplied below its piston 30a, and the upper part of this piston is open to the atmosphere. The piston rod 30b of the lower vertical cylinder 30 passes through the piston 30a.
It is fixed at 0a.

At the top of the lower vertical cylinder 30,
As shown in FIGS. 4 and 5, a lower vertical stop cylinder 31 having a smaller diameter than the lower vertical cylinder 30 is attached. As shown in FIG. 5, this lower vertical stop cylinder 31 is designed such that fluid pressure is supplied above its piston 31a, and the lower part thereof is open to the atmosphere. A piston rod 31b extending downward from the piston 31a of the lower vertical stop cylinder 31 is integrally connected to the piston rod 30b of the lower vertical cylinder 30. In addition, the lower vertical cylinder 3
0 and the lower vertical stop cylinder 31, a shim plate 32 for adjustment can be inserted.

When performing fusing with the gas fusing apparatus having the above configuration, first, each cylinder is operated to move each nozzle to the correct position.

Prior to this, the thickness of the shim plate 32 is adjusted, and when the lower face nozzle 5 is accurately located on the steel passing line L, the lower vertical stop cylinder 3
The piston 30a in 1 is placed in a position where it can move both up and down.

After each crater is placed in the correct position as described above, a fluid pressure sufficient to counteract the weight of the short steel piece 33 is applied to the lower vertical cylinder 30. At this time, for example, lower vertical cylinder 3
0 pressure is AKg/ ^cm2 , the pressure receiving area of the piston 30a is ^2Bcm2 , and the pressure receiving area of the piston 31b of the lower vertical stop cylinder 31 is ^Bcm2 , then this lower vertical stop cylinder A fluid pressure of about 2 AKg/cm ² is applied to 31 to equalize it. Then, the lower vertical cylinder 30 balances itself while applying a biasing force sufficient to resist the weight of the steel billet 33, and the lower surface crater 5 remains located at the steel billet passage line L without being displaced.

From now on, when you want to displace the lower surface crater 5 downward,
It is only necessary to reduce the pressure in the lower vertical cylinder 30, and by applying the original pressure again, the lower surface nozzle 5 can be located at the original billet passage line L again.

Therefore, even if the weight of the steel slab 33 is applied directly to the lower crater 5, the lower crater 5 will not be displaced downward, and will not move upward even when the weight of the steel slab 33 is not applied. Since a constant horizontal position is maintained, the steel piece 33 can be uniformly cut without damaging it during cutting.

As explained above, in this invention, a cylinder that applies a downward force to the piston rod of this lower vertical cylinder is attached to the lower vertical cylinder that urges the lower surface crater upward, so even a short piece of steel can It can be machined uniformly without damaging the surface.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional gas cutting machine, with Figure 1 being a front view, Figure 2 being a side view, and Figure 3 showing the lower vertical cylinder that constitutes the conventional gas cutting machine. The cross-sectional configuration diagram, FIG. 4, and FIG. 5 show one embodiment of this invention. FIG. 4 is a front view of the gas cutting equipment of this invention, and FIG. 5 is a lower vertical view of the gas cutting equipment. FIG. 3 is a cross-sectional configuration diagram of a cylinder and a lower vertical stop cylinder. 1... Traveling trolley, 2... Steel billet passage port, 4... Top crater, 5... Bottom crater, 6... Left side crater, 7
...Right side crater, 8...Main frame, 9...
Upper vertical slider, 10...lower vertical slider, 11...upper vertical cylinder,
14... Upper horizontal slider, 15... Left side slider, 16... Upper horizontal slider, 17... Left side cylinder, 18... Lower horizontal slider, 19... Right side cylinder, 2
0...Lower horizontal cylinder, 21...Right side cylinder, 30...Lower vertical cylinder,
30b, 31b...Piston rod, 31...Lower vertical stop cylinder.

Claims (1)

[Scope of utility model registration request] A main frame having a steel billet passage port in the center thereof is suspended from a traveling bogie running on a traveling rail, and an L-shaped upper vertical slider faces the steel billet passage port at the top of the main frame, and an upper vertical cylinder is attached to the main frame. An L-shaped lower vertical slider is attached to the lower part of the main frame so as to be freely movable in the vertical direction, and is attached to the lower part of the main frame so as to face the billet passage opening, and is also mounted to be movable in the vertical direction by a lower vertical cylinder. An upper horizontal slider having an upper surface crater facing the upper part of the plate and a left side slider having a left side crater facing the left side of the billet passage port are respectively attached to be movable in the horizontal direction by an upper horizontal cylinder and a left cylinder. The vertical slider has a lower horizontal slider having a bottom face facing the lower part of the billet passage opening, and a right side slider having a right side mouth facing the right side of the billet passage opening, which are moved horizontally by the lower horizontal cylinder and the right side cylinder, respectively. In the movably mounted gas cutting device, a lower vertical stop cylinder is attached to the lower vertical cylinder to maintain a constant horizontal position of the lower crater by applying a downward biasing force to the piston rod of the lower vertical cylinder. A gas cutting device characterized by the following.