JPS6234993Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for changing a tuyere sleeve for a converter.

Generally, in a converter, high-pressure air is supplied from the bottom wall of the furnace body through a gas supply pipe to the molten metal in a rotatably supported pot-shaped furnace body, and impurities in the molten metal are oxidized and burned to be removed. Those who did so are known. The tip of this gas supply pipe wears out with use, so it needs to be replaced as necessary. In the case of replacement, the gas supply pipe and tuyere sleeve are protected at the same time because the gas supply pipe is protected by a tuyere sleeve made of refractory material (for example, firebrick) and inserted into the bottom wall of the furnace body. has been replaced.

Therefore, when replacing the gas supply pipe,
The joint unit, which is connected to the gas supply pipe and is located outside the bottom wall of the furnace body and connects the gas supply pipe to the external pipe, is covered with a tuyere sleeve cover, so first remove the tuyere sleeve cover. removal,
Pull out the gas supply pipe together with the joint unit, then dig and remove the tuyere sleeve using a drilling machine, insert a new tuyere sleeve into the bottom wall of the furnace body, and remove the gas supply pipe together with the joint unit. It was necessary to perform the troublesome work of fitting the tuyere sleeve cover into the center hole of the mouth sleeve and attaching the tuyere sleeve cover.

Therefore, in order to improve such replacement work and increase work efficiency, for example, we have developed a drilling machine that is attached to the tip of the boom to drill and disassemble the tuyere sleeve, and a tuyere sleeve cover that is attached to another boom. It is conceivable to use a device in which a crane that can lift There is a problem that it is disadvantageous.

The present invention has been developed in view of this point, and allows the cover hanging arm and various attachments necessary for related work to be attached and detached to the boom system of the drilling machine used for replacing the tuyere sleeve, without having to install booms in parallel. It is an object of the present invention to provide a tuyere sleeve replacement device for a converter, which is provided with a joint member and a jack cylinder, respectively, and can perform tuyere sleeve replacement work by effectively utilizing a boom function.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to the drawings.

1 and 2, reference numeral 1 denotes a converter tuyere sleeve A replacement device, which includes a cell mount 4 supported on a caterpillar type trolley 2 via a boom 3 so as to be movable vertically and horizontally; cell mount 4
A guide cell 6 is attached to the slide cylinder 5 so as to be able to move forward and backward, and the guide cell 6
A drilling machine 7 having a drill rod 7a which is attached to the tuyere sleeve A so as to be movable forward and backward, and which drills and disassembles the tuyere sleeve A.
It is equipped with

The boom 3 has a main boom 10 whose base end is connected to a boom base 9 erected on the trolley 2, and whose base end is connected to the tip of the main boom 10 via a connecting member 11. , and a sub-boom 12 whose tip supports the cell mount 4.

The main boom 10 is movable vertically and horizontally by a boom lift cylinder 13 and a boom swing cylinder 14 interposed between the main boom 10 and the boom base 9.

Further, the sub-boom 12 can be moved up and down by a cell lift cylinder 15 interposed between the middle part of the main boom 10 and the lower part of the connecting member 11.
A sub-boom swing cylinder 17 interposed between the front mounting bracket 16 allows for left and right movement.

Further, the cell mount 4 can be moved left and right by a cell swing cylinder 20 interposed between a mounting bracket 18 at the rear of the sub-boom 12 and a mounting bracket 19 of the cell mount 4.

A joint member 21 is attached and fixed to the front end of the guide cell 6. This joint member 21 includes an attachment C for pulling out a gas supply pipe, which is removably connected and fixed to the base of the gas supply pipe B of the tuyere sleeve A to be disassembled, and a new tuyere sleeve A attached to the bottom wall of the furnace body D. Sleeve insertion attachments E for insertion into the openings _D1 are detachably attached (see FIGS. 5 and 7).

Reference numeral 22 denotes a jack cylinder, which is attached to the front end of the guide cell 6 so as to operate in the same direction as the forward and backward direction of the guide cell 6. Thus, the cylinder body 22a is attached and fixed to the guide cell 6, and the piston rod 22b is It has a contact portion 22c that comes into contact with the bottom wall of the furnace body D to apply a pulling force when the gas supply pipe B is pulled out.

Reference numeral 23 denotes a hanging arm, which is movably pivoted on the upper side of the front end of the guide cell 6.
A hook is attached via a wire 24 so as to hang the tuyere sleeve cover F (see FIG. 4).

The jack cylinder 22 and the slide cylinder 5 are operated by a hydraulic control circuit shown in FIG.
The slide cylinder 5 of the guide cell 6 is controlled to be retractable as the guide cell 2 is extended. That is, when pulling out the gas supply pipe B, when the jack valve 31 is set to the extended position 31a in order to extend the jack cylinder 22, the first cell slide valve 32 for normal digging work is moved to the neutral position in conjunction with this. At the same time as the position 32b is reached, the second cell slide valve 33 becomes the operating position 33a, and the hydraulic pressure supplied to the slide cylinder 5 by the pressure reducing valve 34 is 70 kg/cm 2, whereas the hydraulic cylinder 22 is 200 kg/cm ²
Kg/cm ² , so the slide cylinder 5 retracts in response to the expansion of the jack cylinder 22.

Note that 31b and 31c are the neutral position and retracted position of the jack valve 31, and 32a and 32c are the first
The cell slide valve 32 has an extended position and a retracted position, 33b is the center position of the second cell slide cylinder 33, and 35 is the safety circuit 36 of the cell slide cylinder 5, which has an operating position 36a and a non-operating position 36b. There is.

A control box 37 is operated by a wired control box (not shown) to control the operation of the converter tuyere sleeve changing device 1. 38 is a hydraulic oil tank for the hydraulic system. 39
is a frame in which a power unit (not shown) is housed.

Next, the replacement work of the tuyere sleeve A using the device 1 will be explained.

First, the furnace body D of the converter is rotated so that the bottom wall faces the side. Then, the trolley 2 moves to a predetermined position, rotates the suspension arm 23 forward, moves the guide cell 6 forward, and then attaches the hook (Fig. (not shown) (see the chain line in Figure 4), remove the tuyere sleeve cover F, move the guide cell 6 backward, and attach the joint unit G.
(See solid line in Figure 4).

Then, after removing the tuyere sleeve cover F from the hanging arm 23 and rotating the hanging arm 23 backward, attach the gas supply pipe pull-out attachment C to the joint member 21 using the connecting pins H,
Then, the guide cell 6 is advanced (see the chain line in FIG. 5), and the wires I, I of the attachment C are connected to the joint unit G of the gas supply pipe B.
In this state, operate the jack cylinder 22,
The abutting portion 22c at the tip of the piston rod 22b is brought into contact with the bottom wall of the furnace body D, and the gas supply pipe B is pulled out together with the joint unit G by being stretched.

Thereafter, as shown in Fig. 6, the guide cell 6 is moved forward and the tuyere sleeve A (refractory) is drilled and dismantled by the drill rod 7a to remove most of it, and the remaining part is removed manually. The opening _D1 in the bottom wall of the furnace body D is completely opened.

After the tuyere sleeve A is removed in this way,
As shown in FIG. 7, a new tuyere sleeve A (consisting of, for example, three pieces) connected by a connecting rod J is inserted by applying a sleeve insertion attachment E to the joint member 21. After the insertion is completed, the connecting rod J is dropped into the furnace body D.

Then, insert and attach a new gas supply pipe B.

In the above embodiment, when the gas supply pipe B is pulled out, the hydraulic pressure supplied to the slide cylinder 5 is made smaller than the hydraulic pressure supplied to the jack cylinder 22, so that the extension of the jack cylinder 22 is accommodated. However, when the gas supply pipe B is pulled out, the slide cylinder 5 retracts.
Of course, it is also possible to make it free.

Since the present invention is configured as described above, the boom function can be effectively used to efficiently replace the converter tuyere sleeve without restricting the work range.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the present invention, and FIG. 1 is a side view of a converter tuyere sleeve exchange device;
Figure 2 is a plan view of the same, Figure 3 is a hydraulic circuit diagram showing the relationship between the jack cylinder and slide cylinder, and Figures 4 to 7 are explanatory diagrams of the replacement work of the converter tuyere sleeve, respectively. . 1... Converter tuyere sleeve replacement device, 2...
Trolley, 3...Boom, 4...Cell mount, 5...
...Slide cylinder, 6...Guide cell, 7...
Drilling machine, 7a... Drill rod, 21... Joint member, 22... Jack cylinder, 23...
...Hanging arm, A...Tuyere sleeve, B...Gas supply pipe, C...Attachment for pulling out gas supply pipe, D...Furnace body, E...Attachment for inserting sleeve, F...Tuyere sleeve cover.

Claims (1)

[Scope of utility model registration request] A cell mount supported by a trolley so that it can move up and down and left and right via a boom, a guide cell that is attached to the cell mount with a slide cylinder so that it can move forward and backward, and a cell that can move forward and backward to the guide cell. a drilling machine having a drill rod attached thereto for drilling and dismantling the tuyere sleeve, the apparatus comprising: a drilling machine having a drill rod attached thereto for drilling and dismantling the tuyere sleeve; a joint member to which a supply pipe withdrawal attachment and a sleeve insertion attachment for inserting a new tuyere sleeve are removably attached; and a joint member that contacts the bottom wall of the furnace body and applies a withdrawal force to the gas supply pipe on the guide cell. A jack cylinder for holding the tuyere sleeve cover and a hanging arm for hanging the tuyere sleeve cover are respectively provided. 1. A converter tuyere sleeve changing device, characterized in that it is equipped with a hydraulic control circuit that allows retracting.