JPS58186471A - Method for controlling operation of refractory discharge pipe - Google Patents

Abstract

PURPOSE:To enable uniform lining, by detecting the change in the movement of a refractory discharge pipe used for the refractory lining work for the inside wall of the runner of a kiln and controlling the movement of the discharge pipe adequately. CONSTITUTION:A discharge pipe 1 is inserted into a tape hole A and is rotated by means of a hydraulic cylinder 10. A piston 6 is slided by a means of a hydraulic cylinder 9 to discharge the refractory material through a discharge port 8 and to stick the same on the inside wall surface of the hole A. When the amt. of discharge of the refractory material increases in this stage, the load of the cylinder 9 for driving the piston increases as well. Then, a solenoid valve 56 is controlled automatically by a pressure detector 70, and the advancing and retreating speed of the cylinder 9, that is, the piston 6, is controlled, and the outflow condition of the refractory material is controlled. It is also possible to control the operation of the discharge pipe.

Description

Detailed Description of the Invention The present invention is applicable to the tapping of kilns such as converters, D H furnaces, RH furnaces, pots, and tandinones [1] or refractory lining work (hot and The present invention relates to a method for controlling the movement of a refractory pouring pipe used in cold processing.

For example, in general, in a converter, the inner wall of the tap hole is eroded due to the molten steel during tapping, and as the diameter gradually increases from the initial diameter of 11, the tapping time becomes shorter and the slag inclusion rate increases. It becomes difficult to obtain a steel of good quality.

For this reason, several repair methods have been developed in the past, and one of them is the patent application filed by the applicant in 1983.
There is a method disclosed in No. 1700, in which a refractory pouring pipe is inserted into a tap, and refractory is poured and adhered from spout 1 of the refractory pouring pipe toward the inner wall surface of the tap. The main purpose of this is to However, in the conventional work of refractory lining using pouring pipes, including such repair methods, the pouring pipes are operated exclusively manually, and therefore, if the pouring pressure becomes excessively high, This results in rotation or stoppage of the pouring pipe, which in turn results in uneven lining of the wall surface to be constructed, and increases the working time.

The present invention eliminates the drawbacks of the prior art, and provides a method for controlling the movement of a spout pipe that automatically controls the operation of the spout pipe accurately and reliably, thereby forming a good lining on the wall surface to be constructed. The purpose is to provide the following.

The present invention detects an increase in the load on the piston drive mechanism exceeding a set value due to an increase in the extrusion pressure from the refractory pouring pipe as a change in the working oil pressure of the drive mechanism, and uses the detection signal to detect the increase in the load on the piston drive mechanism or The present invention relates to a method for controlling the motion of a refractory spout 4-f, which is characterized by controlling either a pipe advancing/retracting mechanism or a piston drive mechanism and a pipe advancing/retracting mechanism.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method for controlling the movement of a refractory spout pipe according to the present invention will be specifically described below based on the embodiments shown in the accompanying drawings.

(First embodiment) Figure 1 This embodiment detects the increase in load on the screw drive mechanism due to an increase in the extrusion pressure of refractories as a change in the working oil pressure of the mechanism, and drives the piston based on the detection signal. The mechanism controls the movement of the refractory extrusion piston.

A cuff control system used in the control method shown in FIG. 1 and a repair device controlled by the hydraulic control system are shown. First, let's talk about the structure of the repair device.
11) is a refractory pouring pipe inserted into the converter tap hole (A), and the base end of the pouring pipe (1) is inserted into the tap hole (A).
The rotation of the refractory pouring pipe Tl is rotatably attached to the upper surface of the tip of the carriage (2) via a bearing (31 (4)), which is reciprocating toward A). 4) It is carried out by a rotating hydraulic motor (5) provided above. Another refractory pouring pipe! Inside 11 is a refractory extrusion piston (
6) is slidably disposed, and the refractory filled into the pouring pipe from the inlet (7) is placed at the tip of the pouring pipe (11) by operating the piston (6). The steel is extruded and deposited from the spout (8) onto the inner wall surface of the tap hole (A).

The sliding movement of the piston (6) within the spout pipe +11 is performed by the first hydraulic cylinder (9) for driving the piston located at the rear, and the same hydraulic cylinder (9) reciprocates in the same way as the spout pipe Tl). It is mounted on the stand (2). In addition, QOI is a second hydraulic cylinder for advancing and retracting the pipe to reciprocate the carriage (2), and the pouring pipe (1) and the first hydraulic cylinder (9) are integrally moved out by driving the hydraulic cylinder Ql. It will move forward and backward with respect to the steel mouth (A).

Further, the hydraulic control system according to this embodiment has the following configuration. In other words, (50) in the figure is a hydraulic tank, (51)
indicates a hydraulic pump discharging hydraulic fluid at the required pressure, and (
52), (53), and (54) are the hydraulic motor control solenoid valves (5) that supply the hydraulic oil from the same hydraulic pump, respectively.
5) is a hydraulic oil supply path for feeding the first hydraulic cylinder control solenoid valve (56) and the second hydraulic cylinder control solenoid valve (57). In this example, the solenoid valve (55)
(56) and (57) use a 4-bottom, 2-position valve and a 4-bottom, 3-position valve, respectively. 'Also, each solenoid valve (
55) (56) (57) and hydraulic motor (5),
1st. The second hydraulic cylinder (9) and OI are connected to the outgoing pipe (55a) (56a) C57a) and the incoming pipe (55
b) (56b) and (57b), respectively. Furthermore, (58) to (62) are lead wires from the power supply line to each electromagnetic valve (55), (56), and (57).

Note that (63) is a relief valve. The hydraulic control system further includes a pressure detection circuit, which detects a pressure change in the hydraulic oil caused by an increase in the load on the first hydraulic cylinder (9) for extruding refractories, and sends the detection signal to the solenoid valve. (56), the solenoid valve (56) is automatically operated, and the movement of the first hydraulic cylinder (9), that is, the piston (6) is adjusted within the pouring pipe ill, and the optimum pouring, Adhesion conditions are obtained. In this embodiment, such a pressure detection circuit is connected to the outgoing pipe (
A pressure detection device (70) is installed in the middle of 56a), and the pressure detection device (70) and the solenoid valve (56> are connected to the signal transmission circuit (
71).

The extraction pipe is controlled as follows by the hydraulic control system having the above configuration.

First, the second hydraulic cylinder Ol is driven to insert the pouring pipe (fl) into the tapping port (1), and simultaneously or before and after that, the pouring pipe (1) is rotated. Furthermore, the first hydraulic cylinder (9) is driven to move the piston (6) to the pouring pipe fil.
The refractory is poured out from the spout (8) and adhered to the inner wall surface of the tap 1 (A).
Repair A).

When the amount of refractory poured into the tap port (A) from the pouring pipe (1) increases during the above repair, the load on the piston driving cylinder (9) also increases. The hydraulic pressure for driving the cylinder (9) also increases in proportion to this increase in load. At this time, since the present invention has the above-mentioned pressure detection circuit, this increased pressure can be detected by the same circuit, and by sending this detection signal to the solenoid valve (56), the solenoid valve (56) is automatically operated. By controlling the advance and retreat speed of the first hydraulic cylinder (9), that is, the advance and retreat speed of the piston (6), the refractory flows out from the pouring pipe (1) to the construction surface forming the tap hole (A). can be performed uniformly and smoothly.

(Second Embodiment) Figure 2 This embodiment detects an increase in the load on the piston drive mechanism due to an increase in the extrusion pressure of refractories as a change in the working oil pressure of the mechanism, and uses the detection signal to move the pipe forward and backward mechanism. The present invention relates to a method for controlling the advance and retreat of a refractory pouring pipe.

The hydraulic control circuit in this embodiment includes a pressure detection circuit that includes a pressure detection device (72) installed in the middle of the outgoing pipe (56a) of the first hydraulic cylinder (9), and a pressure detection device (72) and a solenoid valve (57).
) are configured by communicating through a signal transmission circuit (73).

With the above configuration, changes in the pressure of the hydraulic oil caused by an increase in the load on the first hydraulic cylinder (9) for extruding refractories are detected, and this detection signal is sent to the solenoid valve (57). 57) and by controlling the advancing and retreating speed of the second hydraulic cylinder α for driving the piston, the refractory is uniformly and smoothly applied from the pouring pipe (11) to the uneven wall surface of the tap hole. It can be poured into.

(Third Embodiment) Figure 3 This embodiment detects an increase in the load on the piston drive mechanism due to an increase in the extrusion pressure of refractories as a change in the working oil pressure of the mechanism, and uses the detection signal to detect the increase in the load on the piston drive mechanism. The present invention relates to a method for simultaneously controlling the movement of a refractory extrusion piston and the advance and retreat of a refractory pouring pipe by a pipe advance and retreat mechanism.

In the hydraulic control circuit in this embodiment, a pressure detection circuit is installed with pressure detection devices (70) (72) in the middle of the outgoing pipe (56a) of the first hydraulic cylinder (9) for driving the piston, and a pressure detection device (7o) is installed. A signal transmission circuit (
71) and the pressure detection device (72) is connected to the solenoid valve (57) through a signal transmission circuit (73).

By having the above configuration, the first hydraulic cylinder (9)
The same circuit can detect the pressure that increases in proportion to the increase in load, and by sending this detection signal to the solenoid valves (56) (57), the solenoid valves (56) (57) are automatically operated, The first hydraulic cylinder (9
) can control the press-fitting speed of the piston (6) to obtain optimal pouring and adhesion conditions.

As described above, the method for controlling the pouring pipe according to the present invention enables pouring (filling) of refractory into the runner, which was previously impossible.
Work can be controlled, and the following effects can thereby be achieved.

fll A lining of uniform density can be applied to the entire inner wall surface of the construction body.

(2) And regardless of the unevenness of the construction object, every detail is
3) Since excessive load can be prevented, pouring refractories can be filled and the adhesion rate can be improved.

The rotation of the pipe and the movement of the piston can be made smooth.

(4) Conventionally, it was not possible to apply uniform lining because the lining condition inside the runner was not known, but by detecting changes in the movement of the spout pipe and accurately controlling the movement of the spout pipe based on the detected values, uniform lining can be achieved. It is possible to apply lining (a lining that is completely filled into the area to be repaired and whose filling density is sufficiently uniform in each part).

(5) It is possible to detect the onset of seizure of the spout pipe to the work surface, and quickly retreat the spout pipe from the runner to prevent seizure.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a hydraulic control system used in a first embodiment of the method for controlling a refractory pouring pipe according to the present invention, FIG. 2 is a circuit diagram of a hydraulic control system used in the second embodiment, and FIG. FIG. 2 is a circuit diagram of a hydraulic control system used in a third embodiment. Patent applicant Kurosaki Ceramics Co., Ltd. Agent Ito Okimo (and 2 others)

Claims (1)

[Claims] 1. As the extrusion pressure from the refractory pouring pipe increases, an increase in the drive mechanism load exceeding the set value is detected as a change in the working oil pressure of the drive mechanism, and a C is sent to the open 111 signal. A method for controlling the movement of a refractory pouring pipe, characterized in that the screw drive mechanism or pipe advance/retreat mechanism controls either the drive mechanism or the pipe advance/retreat mechanism using a screw.