JPS5833060B2 - Shitushiki Plast Niokel Kensakuriyouchiyouseihou Oyobi Sonosouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for adjusting the amount of abrasion on the surface of a strip or the like by adjusting the amount of abrasive slurry used during descaling by wet blasting.

When descaling by wet blasting, it is necessary to arbitrarily adjust the line speed depending on the material to be treated, and the line speed needs to be accelerated or decelerated depending on various conditions, and in some cases the line must be stopped. Furthermore, even at the same line speed, it is necessary to adjust the amount of descaling depending on the thickness of scale adhering to the surface of the material and the ease with which it can be removed.

A conventional grinding device is shown in FIG.

In the grinding device, a mixer b provided in a tank a
The abrasive slurry is stirred to have a uniform concentration, and it is supplied to the nozzle f from the header C provided on the side wall of the tank a through the throttle valve d1 and the pipe e, and is then supplied to the injection hole g provided in the nozzle f. The strip S was ground by projecting high-pressure water onto the surface of the strip S.

However, in the above-mentioned grinding device, since the flow rate of the abrasive slurry is adjusted by the throttle valve d, the header 0 section is easily clogged with the abrasive slurry, and when the throttle valve d is throttled, the flow rate of the abrasive slurry is adjusted as shown in Fig. 2. Even if the tank level h is the same, the concentration of the abrasive slurry in tank a changes, so it is difficult to adjust the amount of grinding simply by adjusting the opening degree of throttle valve d. Control that corresponds to the opening degree of d is required, and performing such control is complicated and difficult in practice.

Furthermore, some conventional grinding devices are of a type that adjusts the pressure and flow rate of high-pressure water, but this requires complicated equipment and does not allow for very flexible adjustment.

The present invention has been made for the purpose of providing a method and device for adjusting the amount of grinding in a wet type frustum that eliminates the above-mentioned drawbacks. The abrasive slurry supplied to the nozzle was then projected onto the surface of the material to be ground together with high-pressure water to perform grinding and descaling, and then was projected from the nozzle. This method is characterized in that the abrasive slurry and the abrasive slurry not supplied to the nozzle are collected and combined, adjusted to a uniform concentration, and then recycled for use again.

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

1 is a tank, a mixer 2 is rotatably installed in the tank 1, and one end of a flexible pipe 4 is installed at the tip of a header 3 arranged below the side wall of the tank 1. Further, an outflow pipe 5 is attached to the tip of the flexible pipe 4 and is formed to be rotatable up and down by a suitable drive device 6 about a fulcrum X1.

At the forward end of the outflow pipe 5, there is a chamber 1 and the above-mentioned header 3.
A bifurcated bifurcated tube consisting of a receiving tube 8 having an axial center line 12 that is approximately the same as the axial center line 11 of the receiving tube 8, and a receiving tube 10 that contacts the lower end X2 and one side of the upper end of the receiving tube 8 and has a chamber 9. A directional flow switching device will be installed.

A nozzle 12 is fixed to a flange 11 provided at the tip of a receiving tube 8.

The nozzle 12 has a nozzle chamber 13 that communicates with the receiving tube 8.
, an injection hole 14, a chamber 15 for receiving high-pressure water, and the like, and is connected via piping 16 to a pressure regulating valve 17 and a high-pressure source 18 such as a high-pressure pump.

On the other hand, a receiver tank 19 is provided below the receiver pipe 10.
The intake side of the slurry pump 21 is connected to a pipe 20 provided at an appropriate position at the bottom of the tank 19, and the pipe 22 provided on the discharge side of the slurry pump 21 is connected to a concentration adjustment device 23.
and is connected to the tank 1 via piping 24.

Further, a pump 25 and piping 26 are provided at the upper part of the receiver tank 19 for returning the supernatant water in the receiver tank 19 to the high pressure source 18.

Among the above-mentioned devices, flexible pipe 4, outflow pipe 5.
The part (the part surrounded by the two-dot chain line in FIG. 3) constituted by the drive device 6 and the receiving pipes 8 and 10 is the slurry flow rate adjusting device A.

A line speed detector 28 such as Kukogene is connected to one side of a touch roll 27 provided on the front and back surfaces of the strip S, and the line speed detector 28 and a detector 29 of the scale thickness, type, etc. of the strip S are calculated. coupled to the adjustment device 30;
Further, the calculation and adjustment device 30 is connected to the drive device 6 described above.

Further, a setting device 31 is connected to the calculation adjustment device 30.

In the figure, θ is the angle (deviation) formed by the reference line connecting Xl-X2 and the axis of the outflow pipe 5 of the abrasive slurry containing iron sand and the like.

When grinding Sl-IJ knobs etc., first press the pressure regulating valve 17.
The pressure of the high-pressure water is set using the setting device 31, and at the same time, the reference amount of the descaling amount is set in advance using the setting device 31.

When the strip S is transferred from the bottom to the top, the strip S detected by the touch roll 27 and the line speed detector 28
-IJ tube S line speed signal and scale thickness,
The thickness of the scale detected by the detector 29, such as the type, etc.
A signal such as the type is sent to the arithmetic adjustment device 30, which compares it with a reference amount set by the setting device 31 and calculates it.The result is sent as a signal to the drive device 6 to drive the drive device 6. Then, the outflow pipe 5 is deflected by an angle θ corresponding to the signal about the point X1.

On the other hand, the abrasive slurry B stirred to a uniform concentration in the tank 1 enters the outflow pipe 5 from the header 3 via the flexible hose 4, where the abrasive slurry B is mixed with the abrasive material according to the value of the angle θ as shown in FIG. The slurry IJ-B is supplied to the nozzle chamber 13 through the chamber 7 of the receiving tube 8, and the remaining abrasive slurry 1)-B not supplied to the chamber 7 is received from the chamber 9 of the receiving tube 1.0. falls into tank 19.

High-pressure water is supplied to the nozzle 12 with a predetermined pressure applied from a high-pressure source 18 via a pressure regulating valve 17, passes through a chamber 15, and is projected to the outside from an injection hole 14.
Abrasive slurry 1, 1- flowing out from the nozzle chamber 13
B is accelerated and projected onto the surface of the strip S as a high-speed jet stream, and the strip S is subjected to predetermined grinding and descaling.

The abrasive slurry B after being projected onto the strip S falls into the tank 19, and the excess water of the abrasive slurry IJ-B stored in the tank 19 is drained from the pipe 26. It is returned to the high pressure source 18 by the pump 25 or is discarded.

Further, the abrasive slurry IJ-B is sent to the concentration adjusting device 23 by the slurry pump 21, where the particle size is classified and adjusted, and then returned to the tank 1.

When the line speed, scale thickness, type, etc. change due to reasons such as, for example, a signal is sent to the calculation adjustment device 30, compared with the signal from the setting device 31, calculated, and the result is sent to the drive device 6. The angle θ changes according to the signal.

Then, the abrasive material slurry IJ-B is supplied to the nozzle chamber 13 via chamber 7, and the abrasive material slurry IJ-B is supplied to chamber 9.
By changing the amount of , it is possible to perform grinding and descaling depending on the condition of the strip S.

On the other hand, the total amount of the abrasive slurry IJ-B flowing out from the tank 1 does not change and always returns to the tank 1 through the tank 19, so the circulation system of the abrasive slurry IJ-B is always in an equilibrium state with a constant concentration. is maintained, and as a result, stable operation is possible without concentration changes.

When the concentration of the abrasive slurry IJ-H in the circulation system is maintained constant, the amount of grinding can be adjusted by changing the set pressure of the high-pressure water in the pressure regulating valve 17.

In other words, as shown in Fig. 5, the set pressure is Pl〉P2〉P
3, it can be seen that when the concentration of the abrasive slurry is constant, the amount of mold removal increases as the angle θ increases and the pressure increases, and the amount of mold removal decreases as the angle θ decreases and the pressure decreases. Ru.

Similar characteristics can also be obtained by a density setting device provided in the density adjustment device 23.

The drive device 6 in the above-described embodiment may be a hydraulic cylinder, an air cylinder, a combination mechanism of a rack and a pinion, or any other device whose position can be controlled.

As described above, in the method and device for adjusting the grinding amount in wet blasting of the present invention, the concentration of the abrasive slurry can always be kept constant, so that (I) the flow rate characteristics as shown in Fig. 4 can be obtained, and the circulation system Since there is no concentration change, the amount of cleaning can be easily and reliably controlled.

(II) Since there is nothing in the slurry circulation system that obstructs the flow of the abrasive slurry, an equilibrium state with a constant concentration can be obtained and continuous stable operation can be achieved.

(I) Only the angle of the outflow pipe is controlled, and the control is easy and the followability is also very good.

etc., exhibits various excellent effects.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional grinding device, Fig. 2 is a graph showing the state of concentration change when adjusting the opening of the throttle valve in the conventional device, and Fig. 3 is the amount of grinding in the wet blasting of the present invention. FIG. 4 is a graph showing the flow rate of slurry passing through the nozzle when the angle θ between the axis of the outflow pipe and the axis connecting the header and the nozzle is changed; FIG. 5 is a graph showing changes in the amount of grinding when the pressure of high-pressure water and the angle θ are changed. 1 is a tank, 4 is a flexible pipe, 5 is an outflow pipe, 6
1 is a drive device, 8 and 10 are receiver tubes, 12 are nozzles, 13 are nozzle chambers, 14 are injection holes, 15 are chambers, 1
7 is a pressure regulating valve, 18 is a high pressure source, 19 is a tank, 2
1 is a slurry pump, 27 is a touch roll, 28 is a line speed detector, 29 is a detector, 30 is a calculation adjustment device, 3
1 indicates a setting device.

Claims (1)

[Scope of Claims] 1 The abrasive slurry stirred to a uniform concentration is supplied to the nozzle by adjusting the flow rate so that the former is supplied to the nozzle, and then the abrasive slurry supplied to the nozzle is immersed in high-pressure water. At the same time, it is projected onto the surface of the material to be ground for grinding and descaling, and then the abrasive slurry that was projected from the nozzle and the abrasive slurry that was not supplied to the nozzle are collected together and adjusted to a uniform concentration. A method for adjusting the amount of grinding in wet blasting, which is then circulated and used again. 2 An outflow pipe is provided at the tip of the header installed in the tank having the mixer so that it can rotate according to changes in the condition of the material to be ground, and at the end of the outflow pipe there is a receiver for supplying the abrasive slurry to the nozzle. A pipe and a receiving pipe connecting a part of the upper end thereof are arranged in a bifurcated shape, and the receiving pipe is a tank that collects the abrasive slurry projected from the nozzle and the abrasive slurry not supplied to the nozzle. 1. A grinding amount adjusting device for wet blasting, characterized in that the receiver is provided with a tank and the tank is connected by piping provided with a pump.