JPS6050273B2 - Spraying material supply control device for furnace lining spraying equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for preparing furnace bodies such as chimneys, blast furnaces, hot blast furnaces, etc. by mixing a binder with a spray material that is force-fed from a spray material supply device such as a tank to a spray nozzle. The present invention relates to a spraying material supply control device for a spraying device that performs lining spraying.

Conventionally, in this type of spraying equipment, the amount of material discharged from the tip of the spray nozzle was observed with the naked eye, and if the amount of material discharged was too high or too low, the rotational speed of the motor of the delivery device was manually adjusted. Alternatively, place the spraying material supply device on a weighing machine and visually observe how the material decreases as the spraying process progresses. If there is an abnormality in the rate of decrease, or rate of decrease, adjust the rotation of the motor of the delivery device. The numbers were adjusted manually. In general, this type of spraying equipment is divided into closed type and open type depending on whether the material tank is closed or open, and the basics of spraying in either type are how to spray the material. It depends on supplying a fixed amount.

With conventional closed-type systems, considerable variation occurs in the amount of material discharged at the beginning, middle, and end of spraying.
In particular, there is a remarkable difference in the discharge amount between the initial stage and the final stage.

This is caused by the material bridging phenomenon in the material tank and insufficient filling of the material into the delivery device at the final stage. In addition, even in the case of the open door type, variations in material discharge amount are observed due to the bridging phenomenon. In order to eliminate this bridging phenomenon, it has been proposed to install a vibrator at the bottom of the material tank, but with this structure, the material in the tank is filled with vibration, tightens, and becomes stronger. This promotes the bridging phenomenon and has the opposite effect.

As mentioned above, the amount of material discharged fluctuates during the spraying operation, and this tendency becomes particularly noticeable when the bridging phenomenon occurs.

Therefore, it is important to narrow the range of variation in the amount of material discharged as much as possible, and by keeping the amount of material discharged almost constant, it is possible to keep the addition ratio of the binder solution added to it almost constant. . SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a bridging prevention device that prevents the bridging phenomenon of sprayed material within a material supply device, and to detect the actual amount of material discharged from the material supply device by a delivery device. An object of the present invention is to provide a spraying material supply control device that is equipped with a control circuit device that controls the operation of a delivery device according to a detected material discharge amount, and is capable of maintaining the material discharge amount from the material supply device at a set value. .

In this invention, the bridging prevention device preferably has an opening in the side of the material tank, as described in Japanese Utility Model Application Publication No. 57-2008, and air is intermittently supplied into the material tank through this opening. Although devices adapted to spray the material can be used, other structures may be used, such as rod-shaped or vane-shaped stirring devices rotatably mounted inside the material tank.

Further, the control circuit device includes a computer device, and according to one embodiment of the present invention, the amount of material discharged from the material supply device is measured by a weighing machine, this information is inputted to the computer device, and the amount of material discharged is changed. If the amount exceeds the allowable range, a control signal is supplied to the drive device of the quantitative delivery device installed at the bottom of the material supply device, such as a variable speed motor, to automatically change the speed of its rotation to compensate for fluctuations in the material discharge amount. be done.

The present invention will be further described below with reference to the accompanying drawings.

FIG. 1 schematically shows an example of a spraying apparatus in which the present invention can be carried out. Reference numeral 1 denotes a material tank constituting a material supply device, and the lower part of this material tank 1 is equipped with any suitable structure such as a feed wheel type. A metering device 2 is provided, which metering device 2 is driven by a drive device 3, which can consist of a variable speed motor, such as a pulse motor or a motor with an electric remote control gearbox.

In addition, the material discharge port 2a of the quantitative delivery device 2 is connected to the pressure feed hose 4.
It is connected to the spray nozzle 5 via. Material discharge port 2a
There is an air cylinder 2 that supplies and shuts off the material.
b is provided. This spray nozzle 5 is combined with a binder solution adder 6, and this adder 6 adds the binder solution adder 6 to the spray material that has been pressure-fed from the material tank 1 to the spray nozzle 5 via the pressure feed hose 4. The binder solution supplied through the hose 6a is added at a constant rate. Naturally, the addition ratio of the binder solution can be determined depending on the explosive quality of the spraying material used. Also the first
In the figure, 7 is a weighing machine, on which the material tank 1 is placed by a support frame 8.

The weighing machine 7 is equipped with, for example, a digital weight indicator 7a, and the amount of material discharged from the material tank 1 to the spray nozzle 5 can be measured by this indicator 7a. One or more bridging prevention devices 9 are provided on the side of the material tank 1, and in the illustrated example, the bridging prevention device 9 is connected to the tank from a casing 9a provided on the side of the material tank 1 through an air permeable member. It has a structure that intermittently injects high-pressure air from the air vibe 9b into the air vibrator 1.
Air injection is controlled by an electromagnetic valve 9c.

This device 9 makes it possible to prevent the occurrence of bridging phenomena of the sprayed material, such as in tapered sections in the material tank 1, thereby ensuring a continuous supply of the sprayed material to the metering device 2 at the bottom. In the illustrated example, a tank 1 is used as the material supply device, but a hopper or a strange pin may be used instead.

FIG. 2 is a block diagram showing the structure of an embodiment in which the apparatus according to the present invention is applied to the spraying apparatus of FIG. 1.

In FIG. 2, parts corresponding to those of the device in FIG. 1 are designated by the same reference numerals. Block 10 is a computer device forming a control circuit device which is the essential part of the present invention. To explain the operation of the device shown in FIG. 2, the discharge amount of the material discharged from the material tank 1 by the quantitative dispensing device 2 is measured by the weight display 7a of the weighing machine 7, and the weighing data is sent to the computer device 10. input. The computer device 10 processes this weighing data and determines whether the amount of material discharged from the material tank 1 is within the allowable range. If the amount of material discharged exceeds the allowable range, the computer device 10 performs quantitative processing. A control signal is supplied to a variable speed motor 3 which is a driving device of the delivery device 2, and the rotational speed of the variable speed motor 3 is changed to compensate for fluctuations in the amount of material discharged by the quantitative delivery device 2. The bridging prevention device 9 is operated at predetermined time intervals by a command signal set in the computer device 10 in consideration of the quality of the sprayed material used, the structure of the material tank, etc. Furthermore, the computer device 10 supplies a command signal to the binder solution adder 6, which causes the binder solution to be added to the sprayed material at a constant rate set depending on its quality. Furthermore, although not shown in the drawings, it is possible to arbitrarily set the material discharge amount in advance using the computer device 10, and also to be able to automatically select the injection pressure and injection time of the sprayed material. is also possible.

In addition, the amount of air required for spraying work is automatically controlled within a certain range, but if the conveyance distance of the sprayed material is longer than specified in the horizontal or vertical direction, or in both directions, the pressure loss will increase and the It is necessary to increase the amount of air. For this purpose, it is also possible to store in the computer device 10 the relationship between the horizontal and vertical distances of material conveyance and the pressure loss, and to automatically control the amount of air based on this. As described above, according to the present invention, the amount of material discharged from the sprayed material supply device can be stabilized, so the addition ratio of the binder solution is also stabilized, and a lining with uniform quality can be obtained. .

In addition, since the adjustment of the amount of material supplied from the material supply device and the amount of binder added are automatically controlled by a computer, spraying does not require specialized skills and can be carried out by anyone. Construction that previously required five workers can now be completed by two or three, resulting in significant labor savings.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the overall structure of a spraying apparatus according to the present invention, and FIG. 2 is a block diagram showing an embodiment of the apparatus according to the present invention.

Claims (1)

[Scope of Claims] 1. In a furnace body lining spraying device that sprays the lining of a furnace body by mixing a binder with the spraying material that is force-fed from the spraying material supplying device to the spraying nozzle, the spraying material supplying device is equipped with a bridging prevention device that prevents the bridging phenomenon of the sprayed material in the quantitative delivery device and the sprayed material supply device, and the above-mentioned fixed amount is delivered according to the amount of material discharged from the sprayed material supply device detected via the metering device. A spraying material supply control device, comprising a control circuit device for controlling the operation of the device, whereby the amount of material discharged from the spraying material supply device can be maintained at a preset amount. 2. The device according to claim 1, wherein the fixed-quantity delivery device is driven by a variable speed motor, and the rotation speed of the variable speed motor is controlled by the output of a control circuit device. 3. The device according to claim 1, wherein the bridge prevention device is actuated by a command signal from a control circuit device. 4. The device according to claim 1, wherein the amount of binder added to the sprayed material is controlled by a control circuit device.