JP2000129320A - Device for shifting lance for blowing into blast furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily execute the handle operation even if the fitting space is narrow, by composing a lance shifting device of a screw tube fixed to the outer periphery at the rear part of the lance, a stay tube fixed to a guide tube at the one end and an operating handle fixed to the outer periphery at the rear part of a cylindrical nut screwed on the screw tube and rotatably restrained to the stay tube. SOLUTION: When the operating handle 20 is turned, the cylindrical nut 16 is rotated while restraining with a bush 17a, ring 17b, etc. Since the cylindrical nut 16 is screwed with the screw tube 11, the blowing lance 6 can be shifted to the front and the rear parts to the guide tube 4 by normally or reversely turning the operating handle 20. In the case of retracting the front end part of the blowing lance 6 into the guide tube 4, the operating handle 20 may be executed by turning the blowing tube in the drawing-out direction to the rear side with the cylindrical nut 16 screwed with the screw tube 11. Further, in the case of projecting the front end part of the blowing lance 6, the operating handle 20 is executed by turning in the reverse direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving device of a blowing lance for blowing powder from a tuyere into a blast furnace.

[0002]

2. Description of the Related Art The tip of a blowing lance for blowing powder such as pulverized coal into a blast furnace has a high temperature (about 1200 to 1350 ° C.).
Exposure to high pressure air. In order to suppress oxidative wear of the tip of the blowing lance, the tip is made of ceramics. This ceramic has a problem that when it is rapidly cooled, it is broken by heat shock.

The blowing lance is pulled out of the furnace when there is no wind to check the abrasion state of the tip, and the like. In the case of a blowing lance having a tip made of ceramics, the above-mentioned crack is prevented. For this reason, it is necessary to lower the temperature by retracting the tip of the blowing lance into the guide tube before pulling it out of the furnace. Also, when not blowing powder,
It is necessary to evacuate the distal end in the guide tube to protect it from high temperatures.

A device for moving the tip of a blowing lance into a guide tube is disclosed in Japanese Patent Application Laid-Open No. H10-168507. This is because a handle is provided on a support member attached to a guide tube, and the handle is rotated to rotate a screw rod through a pair of bevel gears. When the handle is rotated, the nut member moves along the threaded rod, and the blowing lance is retracted and stored in the guide tube. "

[0005]

The installation space of the moving device of the blowing lance has a narrow installation space because there are adjacent air blow branch pipes and auxiliary equipment. However, the moving device disclosed in Japanese Patent Application Laid-Open No. H10-168507 requires a space for mounting a handle, a bevel gear, a threaded rod, and a nut member, and is not preferable in a place where a mounting space is narrow. In addition, there is a problem that it is difficult to operate the handle if it is installed in such a place.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a moving device of a blow-in lance which has a small mounting space and is easy to operate a handle even in a place where the mounting space is narrow.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to provide a screw tube fixedly mounted on the outer periphery of a rear part of a lance for blowing a blast furnace, a stay tube fixed at one end to a guide tube, and a screw tube connected to the screw tube. A blast furnace blower comprising a tubular nut rotatably restrained by a bush and a bush retainer fixed to the stay tube, and an operating handle fixed to a rear outer periphery of the tubular nut. Achieved by means of a moving lance.

[0008] Since the device of the present invention is constructed as described above, the mounting space can be reduced and the operation handle can be easily operated even in a narrow mounting place.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view of the apparatus of the present invention, and FIG.
FIG. 4 is a cutaway view of a blow pipe showing a state where the device of the present invention is attached.

In FIG. 1, 4 is a guide tube, 4a is a flange of the guide tube 4, and 6 is a blowing lance inserted into the guide tube 4. On the rear outer periphery of the blowing lance 6, a tip portion of the blowing lance 6 (portion exposed from the guide tube 4 to the tuyere side at the time of powder blowing) has a sufficient length to be accommodated in the guide tube 4. The screw tube 11 is fixed. Stoppers 11a and 11b are attached to both ends of the screw tube 11, respectively.

A packing housing flange 12 is bolted to the flange 4a of the guide tube. Reference numeral 13 denotes a packing attached to a packing storage portion formed on a boss of the packing storage flange 12. This packing 13
This is to prevent the gas in the furnace from leaking out of the furnace through the gap between the blowing lance 6 and the guide tube 4. 14 is a packing presser.

Reference numeral 15 denotes a stay tube, and a front flange 15a of the stay tube 15 is bolted (joined) to the packing housing flange 12. Reference numeral 16 denotes a cylindrical portion having a cylindrical portion having a screw hole screwed into the screw tube 11 and a flange formed on one outer periphery of the cylindrical portion. The outer periphery of the convex edge of the cylindrical nut 16 is loosely fitted to the inner periphery of the stay tube 15 on the rear end side. Reference numeral 17a denotes a bush having a cylindrical portion having a hole to be fitted on the outer periphery of the cylindrical portion of the cylindrical nut 16 and a flange formed on the outer periphery of the rear end of the cylindrical portion. This bush 17
a is fitted on the outer periphery of the cylindrical portion of the cylindrical nut 16. 1
Reference numeral 7b denotes a ring having a hole that fits around the outer periphery of the cylindrical portion of the cylindrical nut 16;
a is fitted to the outer periphery of the cylindrical portion of the cylindrical nut 16.

Reference numeral 18 denotes a cylinder having a convex portion which fits into an annular concave portion formed between both flanges of the bush 17a and the ring 17b, and concave portions on both sides of the convex portion where the flanges of the bush 17a and the ring 17b fit. And a bush retainer having a flange on one side of the cylindrical portion.

The flange of the bush retainer 18 is bolted to the rear flange 15b of the stay tube. The bush 17a and the ring 17b are held between the cylindrical nut 16 and the bush retainer 18 and are rotatable. Cylindrical nut 1
6 has a rear end projecting rearward from the flange of the bush 17a, and a screw is engraved on the outer periphery of the rear end.

Reference numeral 20 denotes an operating handle having a boss 21 having a screw hole screwed into the rear end of the cylindrical nut 16 and a handle attached to the outer periphery of the boss. An operation handle 20 is attached to the rear end of the cylindrical nut 16 by screwing the boss 21 thereof. And boss 2
1 and the cylindrical nut 16 are integrated by a fixing screw 22 screwed into a threaded portion on their rear end surfaces. Therefore, when the operation handle 20 is turned, the cylindrical nut 16 rotates while being restrained by the bush 17a, the ring 17b, and the bush retainer 17. Since the cylindrical nut 16 is screwed with the screw tube 11, by rotating the operation handle 20 forward and reverse, the blowing lance 6 is connected to the guide tube 4.
(Or stay tube 15) can be moved back and forth. 19 is a bush 17a and a ring 17
It is a greasing port for greasing the inner peripheral surface of b and the thread portion of the knitting tube 11.

FIG. 2 shows a state in which the apparatus of the present invention is mounted on a guide tube. 1 is a tuyere, 2 is a large tuyere for holding the tuyere 1, and 3 is a blow pipe connected to the tuyere 1. The blow pipe 3 has a guide tube insertion portion 3a formed for inserting and mounting the guide tube 4. The guide pipe 4 is fixed to the blow pipe 3 by a mounting piece 5. The moving device 10 for the blowing lance is fastened to the flange of the guide tube 4 by bolts.

FIGS. 1 and 2 show a state in which the tip of the blowing lance is projected into the tuyere and the powder is blown into the furnace. When retracting the distal end portion of the blowing lance 6 into the guide tube 4, the operating handle 20 may be turned in a direction in which the cylindrical nut 16 screwed to the screw tube pulls the blowing tube rearward. Good. In addition, blow lance 6
When projecting the tip of the nozzle into the tuyere 6, the operation handle 20 may be turned in a direction opposite to the above direction.

[0019]

Since the device of the present invention is constructed as described above, it can be mounted even in a place where the mounting space is narrow, and the operation handle can be easily operated even in such a place.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of the device of the present invention.

FIG. 2 is a cutaway view of a blowpipe showing a state where the device of the present invention is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tuyere 3 Blow pipe 4 Guide pipe 4a Flange of guide pipe 6 Injection lance 10 Moving device 11 Screw pipe 12 Packing storage flange 13 Packing 14 Packing presser 15 Retainer pipe 15a, 15b Retainer pipe flange 16 Cylindrical nut 17a Bush 17b Ring 18 Bush retainer 20 Operation handle

Continuation of the front page (72) Inventor Daisuke Mitsunaga 1-2-1 Marunouchi, Chiyoda-ku, Tokyo F-term in Nihon Kokan Co., Ltd. (reference) 4K015 AD02 AD03

Claims (1)

[Claims] 1. A screw tube fixedly provided on the outer periphery of a rear portion of a blast furnace lance, a stay tube fixed at one end to a guide tube, a bush to the screw tube, and a bush to the stay tube. A blast furnace blowing lance moving device, comprising: a tubular nut rotatably restrained by a bush retainer fixed to a stay tube; and an operation handle fixed to a rear outer periphery of the tubular nut.