JPH06171933A - Method for controlling operation of basket gypsum dehydrator - Google Patents

Abstract

PURPOSE:To control the operation of a basket gypsum dehydrator so that the dehydrator is operated while the rotating basket is filled with gypsum and then stably and efficiently operated. CONSTITUTION:The concn. of a gypsum slurry 4 is detected, and the time until the basket 7 rotating in the dehydrator 6 is filled with the slurry is predetermined in accordance with the concn. A feed valve 5 is opened to feed the slurry to the dehydrator 6 for the predetermined time, and then the valve 5 is closed to dehydrate the slurry by the basket 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control method for a basket type gypsum dewatering machine.

[0002]

2. Description of the Related Art A conventional gypsum dewatering device has, for example, a structure as shown in FIG. In FIG. 2, 2
1 is a dehydrator, 22 is a basket of the dehydrator 21, 23 is gypsum in the basket 22, 24 is a gypsum slurry supply line, 25 is a liquid supply valve, 26 is a full detector, and 27 is a full detector 26. The detection contact surface 28 is a recovered gypsum.
Now, the dehydrator 21 is enlarged and shown in a sectional view in FIGS. 3 and 4. Here, FIG. 3 shows a state in which the liquid supply valve 25 of FIG. 2 is opened and operated, and FIG. 4 is a state in which the liquid supply valve 25 is closed to perform a dehydration step, and then the plaster of FIG. 2 is performed. 23 shows the state of discharging 23. 3 and 4, 29 is a casing of the dehydrator 21, 30 is a rotating shaft, 31 is a drive pulley, 32 is a boss portion, 33 is an arm that integrally connects the boss portion 32 and the basket 22, 34 is a scraper for scraping the plaster 23, 35
Is a cylinder for vertically moving the scraper 34, 36 is also a cylinder for horizontally moving the scraper, 37 is a liquid supply port, 38 is a filtrate discharge port, and 39 is a discharge port of the plaster 23. Next, in order to operate the dehydrator 21 of FIG.
And the liquid supply valve 25 is opened to supply liquid into the basket 22 from the liquid supply port 37 of FIG. 3 (supply of gypsum slurry).
do. Then, the gypsum (solid content) 23 adheres to the filter cloth inside the basket (mesh) 22 by centrifugal force, and the filtrate (water) passes through the filter cloth and is discharged from the filtrate outlet 38 of FIG. Is continuously leaked to. When the gypsum adheres and reaches the detection contact surface 27 of the full detector 26 shown in FIG. 2, full is detected, the liquid supply valve 25 is closed, only the liquid supply is stopped, and the basket 22 is rotated. As it is, the attached solids are dehydrated. After that, as shown in FIG. 4, the scraper 34 is moved vertically and laterally to scrape the solid content, and the solid content is discharged from the solid content discharge port 39 to the outside of the machine. Hereinafter, this is repeated. That is,
Conventionally, by opening the liquid supply valve 25 for a fixed time, the detection contact surface 27 of the full detector 26 has a plaster 23.
The basket 22 is transferred to the dehydration process, assuming that the basket 22 is full.

[0003]

However, the above-described fullness detector 26 is not highly reliable, and if it fails, the liquid supply valve 25 is closed before the plaster 23 is full. Since the basket 22 enters the dehydration process, there is a problem that vibration occurs and satisfactory performance cannot be obtained. The present invention is intended to solve the above problems. That is, the present invention provides an operation control method for a basket-type gypsum dewatering machine, which can enter a dewatering process when the gypsum in the basket is full and perform stable operation satisfying the performance of the dewatering machine. The purpose is.

[0004]

In order to achieve the above object, an operation control method of a gypsum dewatering machine according to the present invention detects the concentration of gypsum slurry and rotates a basket in the dewatering machine according to the concentration. The time until it is filled with gypsum is set in advance, and until that time, the liquid supply valve to the dehydrator is left open to supply liquid, and at that time the liquid supply valve is closed. And transferring the basket to a dehydration step.

[0005]

According to the present invention, the time until the concentration of gypsum slurry is detected and the rotating basket in the dehydrator is filled with gypsum according to the concentration is determined in advance,
Until that time, liquid is supplied with the liquid supply valve to the dehydrator left open, and at that time, the liquid supply valve is closed and the basket is transferred to the dehydration process.
That is, when the gypsum in the basket is full, the dehydration process is started, so stable operation with satisfactory performance of the dehydrator can be performed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a gypsum dewatering device for carrying out the operation control method of the present invention. In FIG. 1, 1 is a gypsum slurry line from an absorption tower, 2 is a gypsum slurry tank, 3 is a pump, 4 is a gypsum slurry supply line, 5 is a liquid supply valve, 6 is a basket type dehydrator, 7 is the dehydrator 6 Of the basket, 8 is the gypsum in the basket 7, and 9 is the recovered gypsum. Further, 10 is a densitometer, 11 is a calculator, 12 is a timer, and 13 is a dehydration process switching device.

That is, the concentration meter 10 detects the concentration of gypsum slurry in the gypsum slurry supply line 4, and the time until the rotating basket 7 of the dehydrator 6 is filled with gypsum is determined according to the concentration. It is stored in the calculator 11 so that the time can be calculated for the detected density thereafter. In other words, the time until fullness is long at low concentrations and short at high farming levels, so the calculator 11 should be able to calculate the time according to the detected concentrations. Then, the calculator 11 calculates the time, sends the signal to the timer 12, and sets the time.

By doing so, the timer 12
Until that time, the liquid supply valve 5 is left open and liquid is supplied to the basket 7. At that time, the basket 7 is just full, so the liquid supply valve 5 is closed. At the same time, the dehydrating process switch 13 is operated to shift the basket 7 to the dehydrating process.

[0009]

As described above, according to the present invention,
Detect the concentration of gypsum slurry, set the time until the rotating basket in the dehydrator is filled with gypsum according to the concentration, and set the liquid supply valve to the dehydrator until that time. The liquid is left open to supply the liquid, and when the time comes, the liquid supply valve is closed to shift the basket to the dehydration process. Therefore, when the gypsum in the basket is full, the dehydration process is performed. Since it enters, vibration due to imbalance does not occur. Therefore, stable operation with satisfactory performance of the dehydrator can be performed. Moreover, since a full detector with inferior reliability like the conventional one is not used, the reliability is high, and the detection contact surface of the detector does not come into contact with the gypsum and wears, and trouble-free for a long time. It becomes possible to drive.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an example of a basket-type gypsum dewatering device for carrying out an operation control method of the present invention.

FIG. 2 is a front view schematically showing a conventional basket type gypsum dewatering device.

FIG. 3 is an enlarged front sectional view showing an operating state of the dehydrator of FIG. 2 before a dehydration step.

FIG. 4 is an enlarged front cross-sectional view showing a gypsum discharge state of the dehydrator of FIG.

[Explanation of symbols]

 4 Gypsum slurry supply line 5 Liquid supply valve 6 Basket type gypsum dewatering machine 7 Basket 8 Gypsum 10 Concentration meter 11 Computing unit 12 Timer 13 Dehydration process changer

Claims (1)

[Claims] 1. A gypsum slurry concentration is detected, and a time until the rotating basket in the dehydrator is filled with gypsum is determined in advance according to the concentration, and the dehydrator is operated until that time. The method for controlling the operation of the basket-type gypsum dewatering machine, characterized in that the liquid is supplied with the liquid supply valve being left open, and when the time comes, the liquid supply valve is closed to shift the basket to the dehydration step. .