JPS6311278A - Abrasive supplying method in descaling device - Google Patents

Abstract

PURPOSE:To make stable descaling operation performable at all times, by estimating the extent of consumption in abrasives on the basis on the basis of a relationship between watt integrating value of a high pressure pump motor and consumption of the abrasives, and supplying a tank with this estimated quantity of abrasives. CONSTITUTION:Rotational frequency of a high pressure pump driving motor 15 is detected by a detector 30, converting it into the rotational frequency per hour by a controller 31, and it is converted into electric energy by a controller 32, then integrated by a controller 33. When this watt integrating value is reached to the specified value, a command is emitted to a controller 34 from the controller 33, and an abrasive supply pump driving motor 35 is driven as long as the specified time commensuate to the abrasive consumption corresponding to the specified watt integrating value found in advance, thus abrasives are supplied to a tank as much as consumed.

Description

[Detailed description of the invention] <Object of the invention> Industrial field of application The present invention relates to a method for replenishing abrasive material in a descaling device, and more specifically, it relates to a method for replenishing abrasive material in a descaling device, and more specifically, it relates to a method for replenishing abrasive material in a descaling device. The present invention relates to a method for replenishing abrasive material in a descaling device.

Conventional technology Conventionally, when removing scale from a hot rolled steel strip using a fluid mixture of a slurry abrasive material and high-pressure water, the slurry abrasive material 3 is pumped from a tank 1, as shown in Figure 3. 5 to the nozzle G, and high pressure water is supplied to the tank 12
The abrasive slurry 1 is supplied to the high-pressure water nozzle 11 by the pump 14, mixes with the high-pressure water 8, is accelerated and collides with the steel strip 9, and grinds the scale 11i. The slurry-like abrasive material worn by the polished scale and descaling is received by the tray 10 and sent to the tank 1, and the broken and fine abrasive material overflows from the tank and sent to the transportation tank 20.

At this point, the abrasive material with large particles accumulates in the tank 1.

The abrasive material 3 consumed at this time was replenished in the 1980s.
As disclosed in No. 8G5, the upper level of the abrasive material 3 in the tank 1 was detected by a level meter, and when the level fell below a certain level, the abrasive material was replenished from the storage tank 1G. However, stable level detection is not possible due to turbulence in the tank and uneven mixing of the abrasive and water.
For this reason, abrasive material has been replenished at regular intervals. However, with this method, the abrasive is continuously supplied even if the amount of abrasive is reduced by, for example, turning the high-pressure water supply pump 14 to low-pressure water when the line is stopped, and the scale of the hot-rolled steel strip is The abrasive material is used when applying the necessary energy for removing scale according to the generation state by switching between high pressure or low pressure of high pressure water, or when changing the pressure of high pressure water to obtain the necessary energy. There are problems such as the amount of consumption per hour differs significantly.

Problems to be Solved by the Invention The present invention aims to solve these problems. Specifically, by replenishing the tank with abrasive material according to the power consumption of the high-pressure pump, a highly reliable and stable The object of the present invention is to provide a method for replenishing abrasive material in a descaling device that can be operated.

<Structure of the Invention> Means for Solving the Problems and Their Effects The present invention accelerates a slurry-like abrasive supplied from an abrasive tank with high-pressure water pumped by a high-pressure pump and projects it onto a steel strip. At the same time, in the descaling device that circulates the projected slurry-like abrasive to the abrasive tank, the predetermined high-pressure pump is driven when replenishing the abrasive tank with exhausted abrasive material. Estimate the amount of abrasive consumption based on the relationship between the electric power product of the motor and the amount of abrasive consumption, and replenish the estimated circle of abrasive material into the abrasive tank for 1 yen. .

The structure and operation of the present invention will be explained below with reference to the drawings.

Figure 1 shows the integrated power value of the high-pressure pump motor and the abrasive consumption m.
Fig. 2 is a process diagram of a control system that issues an abrasive replenishment command by controlling the rotation speed of a high-pressure pump motor, and Fig. 3 is an explanatory diagram of a conventional scale removal device. It is.

That is, the present invention focuses on the linear relationship between the power consumption of the high-pressure pump and the abrasive material consumption port, and performs stable descaling by replenishing the tank with abrasive material according to the power consumption of the high-pressure pump. It is something.

The abrasive replenishment method according to the present invention will be explained below.

First, the relationship between the power consumption of the high-pressure pump motor 15 and the amount of abrasive consumption is determined in advance. This is shown in Figure 1.

Next, as shown in FIG. 3, slurry-like abrasive material 3 is supplied from tank 1 to nozzle 6 by pump 5;
High-pressure water is supplied from a tank 12 to a high-pressure water nozzle 11 by a pump 14, and the abrasive material 7 is mixed with high-pressure water 8, accelerated, and collides with the steel strip 9 to polish the scale. The refined scale and slurry-like abrasive material are received by a tray and returned to tank 1, but the broken and finely divided abrasive material overflows from tank 1 and is sent to tank 20.

At this time, the consumed abrasive material is replenished by the high-pressure pump motor 1.
When the power 1anllII of 5 reaches a predetermined value,
The tank 1 is replenished by operating the replenishment pump 19 for a specified rft with the amount of abrasive consumption corresponding to a predetermined power accumulation value determined in advance from FIG. Stop myself on the line
The steel strip is descaled by repeating the descaling process until it reaches its peak.

Although it is possible to replenish the exhausted abrasive material at any time, it is more practical to replenish the abrasive material when the electric power 4-4 value of the motor 35 reaches a predetermined value as described above.

Also, Kenr! Replenishment of the abrasive material may also be effected in the same manner by means of a port that drives the transport route (for example, a belt conveyor) from a storage tank containing a large number of people.

Furthermore, the power product method may use a relational expression between the rotational speed of the high-pressure water pump motor and the power consumption.

Example This will be further explained below using examples.

The blade belt was ground by the scale removing device shown in FIG. 3, and the consumed abrasive material was replenished according to the integrated power value of the high-pressure pump motor 15 by the control process shown in FIG.

That is, the rotation speed of the high pressure pump motor 15 is detected by the detector 30.
, a controller 31 converts it into the number of revolutions per hour, and a controller 32 that converts this into electric energy; 3
3 and the controller 34, which issues a command to operate the motor 35 that drives the abrasive replenishment pump 19 for a set time in response to commands from the controller 33, to increase the predetermined power value to 100K.
The abrasive replenishment pump was set to 1 and the operating time of the abrasive replenishment pump was set to 20 m1n, and by repeating this until the line stopped, it was possible to replenish the abrasive in a stable manner.

<Effects of the Invention> As explained above, the present invention accelerates a slurry-like abrasive supplied from an abrasive tank with high-pressure water pumped by a high-pressure pump and projects it onto a steel strip. In a descaling device that circulates this projected slurry-like abrasive material to the abrasive tank, when replenishing the abrasive tank with the used abrasive material, the electric power of the high-pressure pump and the driving motor determined in advance is determined. A mouth for estimating the consumption amount of the abrasive material based on the relationship between the integrated value and the consumption amount of the abrasive material and replenishing the estimated amount of the abrasive material to the abrasive material tank, The replenishment method according to the present invention facilitates replenishment commensurate with the amount of abrasive consumed, making it possible to perform stable steel strip descaling operations.

In addition to descaling steel strips, the present invention can also be suitably used for rust removal and surface roughness adjustment.

[Brief explanation of the drawing]

Fig. 1 is a graph showing the relationship between the integrated power value of the high-pressure pump motor and the abrasive tank, Fig. 2 is a process diagram of the control system that calculates from the rotation speed of the high-pressure pump motor and issues an abrasive replenishment command, FIG. 3 is an explanatory diagram of a conventional scale removal device. Code 1... Abrasive tank 2.13.17...
...Water 3...Abrasive material 5...
・Pump 6... Abrasive slurry projection nozzle 7・
... Abrasive slurry 8 ... High pressure water 9 ... Steel strip 10
...Tray 11 ... High pressure water nozzle 12 ... High pressure water tank 14.19.22 ... Pump 15.35 ... Motor 1G ... Storage tank 18 ... Replenishment abrasive material

Claims (1)

[Claims] A slurry-like abrasive supplied from an abrasive tank is accelerated by high-pressure water pumped by a high-pressure pump and projected onto a steel strip, and at the same time, this projected slurry-like abrasive is circulated to the abrasive tank. In the scale device, when replenishing the abrasive material tank with the abrasive material that has been consumed, the abrasive material is refilled based on the relationship between the integrated power value of the motor that drives the high-pressure pump and the consumed amount of the abrasive material, which has been determined in advance. A method for replenishing an abrasive material in a descaling apparatus, comprising estimating a consumption amount of the abrasive material and replenishing the abrasive material tank in the estimated amount.