JPH05116131A - Device for controlling concentration of cement slurry - Google Patents

Abstract

PURPOSE:To automatically and continuously hold the concn. of a cement slurry to set concn. CONSTITUTION:A slurry raw material supply device 2 for supplying a slurry raw material is provided to a cement slurry kneading device 1 and a sample taking-out pipe 3 is led out of the cement slurry kneading device 1. A pump 4 and a vibration type liquid densitometer 5 are provided to the sample taking- out pipe 3 and the leading end of the sample taking-out pipe 3 is opened to the cement slurry kneading device 1. A control means 6 adjusting and controlling the mixing of the slurry raw material supplied from the slurry raw material supply part 2 on the basis of the signal of the density data of the cement sturry measured by, a vibration type liquid densitometer 5 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement slurry concentration controller.

[0002]

2. Description of the Related Art In general, when a cement product is manufactured by kneading a cement slurry, it is difficult to measure the concentration of the cement slurry, so that it is conventionally calculated by a mixing ratio.

[0003]

By the way, in the conventional example as described above, it is difficult to continuously measure the cement slurry concentration during kneading, and therefore, the set concentration should be maintained. There is a problem that the cement slurry cannot be kneaded. The present invention is invented in view of the problems of the above-mentioned conventional example, the purpose is to automatically and continuously the concentration of the cement slurry can be maintained at the set concentration To provide a control device.

[0004]

A cement slurry concentration control apparatus according to the present invention is provided with a slurry raw material supply unit 2 for supplying a slurry raw material to a cement slurry kneading apparatus 1, and a sample is provided from the cement slurry kneading apparatus 1. The take-out pipe 3 is led out, the pump 4 and the vibrating liquid densitometer 5 are provided in the sample take-out pipe 3, the tip of the sample take-out pipe 3 is opened to the cement slurry kneading device 1, and the vibrating liquid densimeter 5 is used. The present invention is characterized in that a control means 6 for adjusting and controlling the mixing of the slurry raw material supplied from the slurry raw material supply section 2 is provided based on the signal of the measured density data of the cement slurry.

[0005]

Therefore, the slurry raw material is supplied from the slurry raw material supply unit 2 to the cement slurry kneading device 1 and the cement slurry is kneaded by the cement slurry kneading device 1. The sample is taken out from the sample take-out pipe 3 by the pump 4, and the density of the cement slurry is measured by the vibrating liquid densitometer 5.
The density data of the cement slurry is input to the control means 6, and the mixing of the slurry raw material supplied from the slurry raw material supply unit 2 is adjusted and controlled based on the data, whereby the concentration of the cement slurry is automatically and continuously. It is now possible to maintain the concentration set to.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings. FIG. 1 shows a schematic explanatory view of the present invention. The slurry raw material supply unit 2 has a water supply unit 2a and a raw material supply unit 2b for supplying cement, fiber and pulp,
The supply amount of each is adjustable, so to speak, it is a mass regulator of the slurry raw material. A supply pipe 7 extends from the slurry raw material supply unit 2, and a tip of the supply pipe 7 is opened at an upper portion of the cement slurry kneading device 1. The supply pipe 7 is provided with an opening / closing valve 8.

A rotary kneading blade 9 is rotatably provided in the cement slurry kneading device 1 so as to knead the slurry raw material supplied from the slurry raw material supplying section 2 into the cement slurry kneading device 1. It has become. Then, the cement slurry kneaded in a predetermined state is discharged from the discharging unit 10. A sample take-out pipe 3 is led out to the cement slurry kneading device 1, and a pump 4 made up of a mono pump and a vibrating liquid densitometer 5 are provided in the sample take-out pipe 3. The tip is opened to the cement slurry kneading device 1.

The principle of the vibrating liquid densitometer 5 is as follows. That is, when the vibrating tube is vibrated in a constant vibration mode, its natural frequency f is f∝EI in the material elasticity E, stiffness I and mass M of the vibrating body.
It is known to have a correlation of / M.
Here, it can be seen that if E is invariant, f is inversely proportional to M. In the case of the vibrating densitometer, since the mass of the vibrating element is constant, the natural frequency of the vibrating element changes according to the change in the mass of the fluid that contacts the vibrator. That is, if a good quality material is used for the vibrating element, paying sufficient attention to the structure and manufacture, and taking care not to be affected by the ambient temperature and pressure, E and I can be kept constant at all times. It is possible to continuously perform highly accurate density measurement.

The cement slurry kneaded in the cement slurry kneading device 1 is taken into the sample take-out pipe 3 by the pump 4 and continuously when passing through the vibrating liquid density meter 5 at a constant pressure and a constant flow velocity. Density is measured. Then, the cement slurry whose density has been measured is returned into the cement slurry kneading device 1 from the tip of the sample take-out pipe 3. A signal for measuring the density of the cement slurry continuously measured by the vibrating liquid densitometer 5 is sent to the signal converter 11 for signal conversion, and the data is input to the control means 6 including the recorder 12 and a personal computer. Then, the control means 6 converts the density into a concentration, sends the data to the slurry raw material supply unit 2 which is a mass regulator of water or raw material, and automatically controls the concentration to supply the slurry supplied from the slurry raw material supply unit 2. The concentration of the raw material is adjusted and controlled. here,
When the concentration deviates greatly from the control range, the control means 6 sends an abnormal signal to the electric circuit 13 and the sample take-out tube 3
By switching the three-way valve 14 installed in the
The washing water is supplied from the washing water supply pipe 15 connected via the three-way valve 14 to immediately wash the pump 4 and the vibration type liquid density meter 5. Then, when the cause of the concentration abnormality is dealt with, it is reset manually and the concentration control is continued.

[0010]

According to the present invention, as described above, the cement slurry kneading apparatus is provided with the slurry raw material supply section for supplying the slurry raw material, and the sample take-out pipe is led out from the cement slurry kneading apparatus, A pump and a vibrating liquid density meter are provided in this sample take-out tube, and the tip of the sample take-out tube is opened to the cement slurry kneading device, and the slurry is based on the signal of the density data of the cement slurry measured by the vibrating liquid density meter. Since the control means for adjusting and controlling the mixing of the slurry raw material supplied from the raw material supply section is provided, the cement slurry concentration can be automatically and continuously maintained at the set concentration.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of the present invention.

[Explanation of symbols]

 1 Cement Slurry Kneading Device 2 Slurry Raw Material Supply Section 3 Sample Extraction Tube 4 Pump 5 Vibration Type Liquid Density Meter

Claims (1)

[Claims] 1. A cement raw material supply unit for supplying a slurry raw material to a cement slurry kneading device is provided, a sample take-out pipe is led out from the cement slurry kneading device, and a pump and an oscillating liquid density meter are provided in the sample take-out pipe. And the tip of the sample take-out pipe is opened to the cement slurry kneading device, and mixing of the slurry raw material supplied from the slurry raw material supply unit is performed based on the signal of the density data of the cement slurry measured by the vibrating liquid density meter. A cement slurry concentration control device comprising a control means for adjusting and controlling.