JPS626122Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bottom blowing tuyere attachment/detachment device for a converter for facilitating tuyere replacement in a converter having a bottom blowing tuyere.

Conventional methods for dismantling the tuyeres and tuyere bricks when replacing the tuyeres are as follows: ○B. Punching them out from the furnace mouth using a punching machine.

○B Method of pulling out from the bottom of the furnace using a hydraulic cylinder.

○C Method of breaking the tuyere bricks using a concrete breaker from the bottom of the furnace.

etc. have been proposed. However, in the case of ○A, the inside of the furnace is in a high temperature state (1500 to 1700℃) and the distance from the furnace mouth to the bottom of the furnace is 6 to 10 meters, and the punching rod bends and sags due to the effects of heat, making it difficult to actually punch out. This is difficult and almost impossible.

○ In the case of B, the tuyere and hydraulic cylinder are connected at the bottom of the furnace and the tuyere is pulled out, but molten metal is solidified in the tuyeres and tuyere bricks, and static force alone may be insufficient or the tuyeres may not work properly. It will be partially torn off.

Therefore, at present, most actual tuyere replacements are carried out using the method shown in ○c.

The work in step C is to cut the tuyeres around the hearth bottom using gas, break the tuyere bricks for each tuyere using a concrete breaker by one or two workers, and then clean the surface by hand. Demolition workers wear dust masks, heat-proof masks, heat-resistant clothing, etc., and are careful not to damage the surrounding bricks, so it takes a very long time (6 to 8 hours for one tuyere). was.

In the present invention, the tuyere is struck from outside the hearth bottom by a blower in at least the pulling direction, and then pulled out, and it is much easier to pull out than the one in (○).

An embodiment of the bottom blowing tuyere attachment/detachment device for a converter according to this invention will be described based on the drawings.

The trolley 1 placed on the rail 34 is the lower frame 3
0 and an upper frame 31, and the front end of the upper frame 31 connects to the lower frame 30 via a pivot 32.
The rear end of the upper frame 31 is connected to the lower frame 30 via a jack 33.

4 is a base placed on the truck 1; 6 is an engaging claw for fixing the base 4 to the truck 1; 5 is an engaging claw 6
It is a base engagement fluid cylinder that operates the base.

2 is a lift device placed on a base 4, and has arm pieces 7a and 7b arranged in a cross shape around a central axis 9;
Arm pieces 7a, 7 are connected at both ends with pins 11a, 11b.
It is composed of fluid cylinders 10 each pivotally connected to the cylinders b. One end of each arm piece 7a, 7b is pivotally connected to the base 4 or a main table 8 disposed on the arm pieces 7a, 7b, and each other end is pivoted to the main table 8 or a horizontal direction provided on the base 4. A pin is attached that engages the elongated hole (not shown).

A carriage 13 is provided on the main table 8 and moves forward and backward (left and right in FIG. 1) along a guide (not shown) provided thereon. 8, a hydraulic cylinder 12 is arranged in the front and back direction, and the advance/retreat device 1
4. A striking machine 20 is mounted on the carriage 13.
The proximal end of a rod 15 is removably fixed to the front of the striking machine 20, and a tuyere coupling portion 16 is provided at the front end of the rod 15. 19
a, 19b are new and old tuyere, 18 is new and old tuyere 19a,
The tuyere air supply pipe 19b is connected to the base, and 17 is a tuyere flange provided at the base of the tuyere air supply pipe 18.
A tuyere coupling portion 16 is connected to the tuyere flange 17.

A support arm 21 is provided on the end surface of the main table 8 on the tuyere side of the hearth bottom, and the support arm 21 has a screw rod 2 extending vertically.
2a, 22b are screwed into the screw rods 22a, 22b.
Auxiliary tables 23a and 23b are fixed to the upper end of 22b. By turning the screw rods 22a, 22b, the heights of the auxiliary tables 23a, 23b can be adjusted.

The method of using the bottom blowing tuyere attachment/detachment device for a converter according to this invention will be described.

First, the tuyere 19b of the bottom 3 of the converter is oriented right sideways in advance, and the impact machine 20 is vertically aligned by operating the fluid cylinder 10 and the jack 33 so as to face it directly. Next, turn the screw rods 22a, 22b to adjust the heights of the auxiliary tables 23a, 23b, and pull out the tuyere 19b or remove the tuyere 19a before use.
When inserting the auxiliary table 23a, 2
3b and the tuyere hole 29 so that there is no step difference.

To pull out the used tuyere 19b, connect the tuyere flange 17 and the tuyere coupling part 16, operate the blower 20, and apply a shocking blow to the tuyere 19b in the pulling direction through the rod 15. , easily tuyere 19b
leaves from the tuyere hole 29. Thereafter, when the carriage 13 is pulled by the hydraulic cylinder 12, the used tuyere 19b is pulled out to a predetermined position on the auxiliary tables 23a, 23b, and is carried to the tuyere collection site to complete the removal work.

The installation work of the unused tuyere 19a is carried out in the same manner by completely reversing the procedure described above. However, in this case, although the use of the impact machine 20 is normally not necessary, it may be advantageous to use it very lightly in the pushing direction in order to proceed with the work.

The number of blows of the blower 20 is 1800 times/min, and the maximum pulling capacity is 26 kg-m (compressed air pressure 7 kg/cm ² G), and normally 20 kg-m (air pressure 5 kg/cm ² G) is enough to pull out. It was possible.

Also, the capacity of the hydraulic cylinder 12 is 250Kg to 1000Kg.
It is convenient to be able to arbitrarily adjust the

Figure 2 shows a state in which the converter bottom 3 and the tuyere 19a, 19b are located apart, and Figure 3 shows a single tuyere, but the tuyere nozzle 2 is shown as a single unit.
The communication port part 25 connected to the opening 4 is made of iron, and a part is made of iron using an iron shell 26, and a brick 27 is wrapped around this part to provide heat resistance. The outer periphery of the brick is a truncated cone with a taper of 1/10 to 1/30 to facilitate attachment and detachment.

As described above, the device for attaching and detaching the bottom blowing tuyere for a converter according to the present invention is a device for attaching and detaching the converter tuyere 19b from the outside of the furnace bottom 3, and the main table is placed on a base that can be moved back and forth and the lift amount can be adjusted. A striking machine 20 is arranged on the main table 8 via an advance/retreat device 14, one end is connected to the striking machine 20, and the other end is connected to the tuyere 19b.
A tuyere joint part 16 that can be connected and disconnected is provided at the tip of a rod 15 extending toward the impact machine, and the impact machine is configured so that the rod 15 is struck at least in the tensile direction, which greatly improves work efficiency compared to conventional devices. is good,
It is possible to reduce the working time by 5 to 7 hours per tuyere, which greatly benefits the environmental protection and productivity improvement of workers.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 is a side view of the entire device in use, and Fig. 2 is a side view of the entire device in use.
The figure is a partial side view of the same as above, and FIG. 3 is a longitudinal cross-sectional view of the tuyere. 3... hearth bottom, 4... base, 8... main table,
12... Hydraulic cylinder, 14... Advancement/retraction device, 1
5... Rod, 16... Tuyere joint, 19a, 1
9b...tuyere, 20...blow machine.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A device for attaching and detaching the converter tuyere from outside the hearth bottom, in which a main table whose lift amount can be adjusted is provided on a base that can be moved back and forth, and a moving device is mounted on the main table. A blower is disposed through the blower, one end is connected to the blower, the other end is connected to the blower, and the other end is provided with a tuyere coupling part that can be connected and disconnected at the tip of the rod, and the rod is so arranged that the rod is struck at least in the tensile direction. A bottom blowing tuyere attachment/detachment device for a converter comprising a blower. 2. The attachment/detachment device for a bottom blowing tuyere for a converter according to claim 1 of the utility model registration, characterized in that the advancement/retraction device comprises a hydraulic cylinder.