JP2004223998A - Cleaning device for mixer in ready mixed concrete plant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sprinkle a metered water in a water pipe into a mixer promptly under a high pressure, while applying a pressure of compressed-air in the water pipe to the mixer side constantly without spoiling, in a cleaning device which performs rinsing of the mixer using the metered water to be sprinkled on each kneading process into the mixer used in a ready-mixed concrete plant. <P>SOLUTION: The water pipe is equipped with a water intake section which is separated from a water meter and receives the metered water discharged from the water meter, an air supply means which has an air supply source and supplies the compressed-air from the air supply source to the water pipe, and an opening and closing valve which is set up in a freely openable/closable manner between a connecting position of the air supply source and the water intake section. After the measured water is discharged from the water meter, the valve is closed and the compressed air is supplied into the water pipe so as to apply air-pressure constantly to the mixer side, and the measured water in the water pipe is sprinkled into the mixer under a high pressure. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
[Industrial applications]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixer used in a ready-mixed plant, for cleaning a mixer using metered water sprinkled into a mixer at each kneading step when producing concrete.
[0002]
[Prior art]
Cleaning of mixers used for ready-mixed plants was performed by manual or automatic robots, in which high-pressure water was injected by a high-pressure pump to remove concrete adhering to the mixing tank, cover inner surface, and mixing shaft in the mixer. However, since the cleaning operation takes a long time, the cleaning operation cannot be performed during shipping, and the cleaning is performed after the concrete has been shipped, and the adhered concrete solidifies, making cleaning difficult.
Therefore, utilizing the fact that a predetermined amount of measured water is sprinkled into the mixer in the concrete manufacturing process, the measured water is pressurized by a high-pressure pump at each kneading step, and the high-pressure water is injected into the mixer. There was a method of washing the mixer by sprinkling water. However, in this method, the measuring water is not completely flown into a water pipe or a high-pressure pump that guides the measuring water discharged from the water meter to the mixer, and the entire amount of the measured water is used for kneading the concrete. This is a serious problem in the production of concrete that stabilizes the quality of concrete by controlling moisture.
[0003]
Therefore, instead of using a high-pressure pump to pressurize the measured water, pressure is applied to the measured water using compressed air to spray high-pressure measured water into the mixer to wash the mixer. (For example, see Patent Document 1).
In this conventional method, the measured water after measurement is sent to a pressure tank by a water supply pipe, compressed air is supplied to the pressure tank from an air pipe connected to the pressure tank, and the measured water pressurized in the pressure tank is discharged. The mixer was washed by sending it out through a water pipe and spraying water into the mixer.
[0004]
However, in addition to an air pipe that sends compressed air to the pressure tank, a water pipe that sends metered water from the water meter to the pressure tank and a water pipe that sends metered water pressurized in the pressure tank to the mixer are connected to the pressure tank. Therefore, the compressed air put into the pressure tank from the air pipe pressurizes not only the water pipe for sending the metered water to the mixer but also the water pipe equally. Furthermore, when all the measured water from the water supply pipe was sent to the pressure tank and there was no more water in the water supply pipe, the compressed air in the pressure tank leaked out of the pressure tank through the water supply pipe and was sent from the air pipe. The entire pressure of the compressed air acts on the measuring water and is pressurized, so that the measuring water cannot be sprinkled at high pressure into the mixer.
[0005]
[Patent Document 1]
JP-A-6-23734
[Problems to be solved by the invention]
Therefore, in view of the above problems, an object of the present invention is to always spray the metered water in the water supply pipe at a high pressure to the inside of the mixer without losing the pressure of the compressed air in the water supply pipe, and always apply the water to the mixer side. And
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention includes a water meter for measuring water used for kneading concrete, and a water pipe for sending the measured water measured by the water meter to the mixer. In a mixer cleaning device in a raw plant that pressurizes measured water when water is sprayed to clean the mixer, the water supply pipe is separated from a water meter and receives an intake unit that receives measured water discharged from the water meter. An air supply means for supplying compressed air from the air supply source into the water supply pipe, and an on-off valve provided to be openable and closable between a connection position of the air supply means and a water intake section. After the measured water is released from the water meter, close the on-off valve to supply compressed air into the water supply pipe and constantly apply air pressure to the mixer side to spray the measured water in the water supply pipe into the mixer at high pressure. Features.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a side sectional view of an embodiment of the present invention.
When producing concrete in a ready-mixed plant, the water used for kneading is measured with a water meter so that the desired amount is obtained, and the measured water is kneaded with other materials (aggregate, cement, etc.). Using a water pipe to sprinkle water inside the mixer.
In FIG. 1, a water meter 1 for measuring water supplied from a water supply unit 14 is provided, and the water meter 1 measures the measured water 7 to a desired amount. The water meter 1 is provided with a discharge valve 2 for discharging the measured water 7 at a lower portion of the water meter 1, and when a desired amount of the water 7 is measured, the timing of kneading the concrete is adjusted. , The discharge valve 2 is opened, and the metered water 7 is discharged out of the water meter 1.
[0009]
A water pipe 4 is arranged in a cylindrical form from the water meter 1 to the mixer 9 to guide the metered water 7 discharged from the water meter 1 to the mixer. Since the water measuring device 1 measures the weight of the measuring water 7, the water measuring device 1 and the water supply pipe 4 are provided separately, and receive the measuring water 7 discharged from the discharge valve 2 of the water measuring device 1. The water intake unit 13 is provided at the upper end of the water pipe 4 with a space provided with the water meter 1.
Air supply means 3 for feeding compressed air 8 into the water supply pipe 4 is connected to the water supply pipe 4, and an air pipe 3 a is provided between a connection with the water supply pipe 4 and an air compressor serving as an air supply source 3 c. The air supply valve 3b is provided on the air pipe 3a so as to be openable and closable. When the air supply valve 3b is opened, the compressed air 8 from the air supply source 3c is introduced into the water supply pipe 2. Sent in.
[0010]
The water pipe 4 is provided with an open / close valve 5 that can be opened and closed between the connection position of the air supply means 3 and the water intake section 13. By closing the open / close valve 5, the water pipe is provided above the connection position of the air supply means 3. 4 is shut off to prevent the water pipe 4 from being constantly opened in the water intake section 13, and the upper part of the water pipe 4 is configured to be openable and closable.
The water supply pipe 4 provided up to the mixer 9 is provided so as to penetrate inside the upper part of the mixer, and a plurality of watering nozzles 6 are provided inside the mixer 9 of the water supply pipe 4, and the water supply pipe 4 is sent through the water supply pipe 4. The incoming measuring water 7 is sprayed into the mixer 9. At this time, the measuring water 7 to be sprinkled is pressurized, and the measuring water 7 is sprinkled at a high pressure toward the kneading shaft 10 and the kneading blades 11 provided inside the mixer 9, so that various parts of the mixer 9 are sprayed. Is washed with high-pressure measuring water in each kneading step, and the mixer 9 can be washed.
[0011]
Next, the steps of this embodiment will be described.
2, 3 and 4 are side sectional views of an embodiment along each step of the present invention. FIG. 2 is a side sectional view of a step in which the water meter terminates water measurement. FIG. 3 is a side sectional view of a step of sending out measured water to a water pipe. FIG. 4 is a side cross-sectional view of a step of sending compressed air to a water pipe and spraying metered water. The black arrow in the figure indicates the flow of the measuring water, and the white arrow indicates the flow of the compressed air.
In FIG. 2, the water meter 1 with the discharge valve 2 closed measures the weight of the water in the water meter 1 while being supplied with water from the water supply means 14, and when the water reaches a desired weight, the water is supplied from the water supply means 14. Is stopped, and the water meter 1 finishes measuring the measuring water 7.
In FIG. 3, the water meter 1 that has finished measuring the measured water 7 opens the discharge valve 2 and discharges the measured water 7 to the water intake section 13 of the water supply pipe 4 provided below the discharge port. At this time, the on-off valve 5 provided on the water pipe 4 is in an open state, and the metered water 7 is sent into the water pipe 4 provided separately from the water meter 1.
As shown in FIG. 4, when all the measuring water 7 is sent from the water meter 1 into the water pipe 4, the on-off valve 5 provided at the upper part of the water pipe 4 is closed, and the upper part of the water pipe 4 is closed. It becomes a state and is shut off.
Thereafter, the air supply valve 3b of the air supply means 3 connected to the water pipe 4 is opened, and the compressed air 8 from the air supply source 3c is fed into the water pipe 4 through the air pipe 3a.
[0012]
As the compressed air 8 continues to enter the inside of the water pipe 4, the part of the compressed air 8 inside the water pipe 4 expands. The compressed air 8 moves upward in the water pipe 4 due to its specific gravity being lower than that of water. However, since the upper part of the water pipe 4 is closed by the on-off valve 5, the compressed air 8 does not escape to the outside. 4 stays inside.
Further, when the compressed air 8 is supplied from the air supply means 3, the compressed air 8 portion continues to expand downward from the on-off valve 5, and the inside of the water pipe 4 is directed from the water meter 1 side to the mixer 9 side. Then, the measuring water 7 is filled with the compressed air 8 instead of the measuring water 7, and the inside of the water pipe 4 is replaced with the compressed air 8 from the measuring water 7. The function of being pushed to the mixer 9 side works.
The metered water 7 pushed out by the compressed air 8 inside the water pipe 4 is pressurized toward the mixer 9 and sprayed at a high pressure when water is sprayed from the water spray nozzle 6 provided in the water pipe 4 into the mixer 9. Then, the inside of the mixer 9 is washed with high-pressure water for each kneading process.
[0013]
In the present invention, when pressurizing the measuring water 7 inside the water pipe 4 with the compressed air 8, the compressed air 8 is sent by closing the open / close valve 5 provided at the upper part of the water pipe 7. The compressed water 8 is retained inside the water pipe 4 without escaping outside the water pipe 4, and the entire pressure of the compressed air 8 can be used as the pressure for sending the measuring water 7 to the mixer 9 without impairing the pressure of the compressed air 8. .
Also, in the conventional method, since the measured water is injected into the mixer through the water pipe after being pressurized in the pressure tank, the compressed air in the pressure tank after the injection of the measured water is connected to the pressure tank. It is impossible to send all the compressed air in the pressure tank into the water supply pipe by flowing into both the supply water pipe and the water supply pipe. As a result, the metered water remaining in the water pipe with a small amount of water droplets cannot be completely sent out by the flow of the supplied compressed air, and the inside of the water pipe after passing the pressurized metered water is in a water droplet state. However, in the present invention, since all the supplied compressed air flows to the mixer, the measured water remaining in the form of water droplets inside the water supply pipe 4 due to the flow of the compressed air is also different from the other measured water 7. The metered water 7 is sprinkled into the mixer 9 without remaining in the water pipe 4 without being left.
[0014]
In particular, since the horizontal axis mixer has the mixing shaft 10 provided horizontally, the water supply pipe 4 inside the mixer 9 is provided above the mixing shaft 10 in parallel with the mixing shaft 10, and the water spray nozzle 6 is directed toward the mixing shaft 10. When attached, the measuring water 7 can be concentrated and sprinkled toward the kneading shaft 10, and the kneading shaft 10 and the kneading blades 11 can be more effectively washed.
Further, the direction of the water spray nozzle 6 is not limited to the direction of the kneading shaft 10 and the kneading blade 11, but by additionally providing the water spray nozzle 6 in each direction, the entire inner surface of the mixer 9 can be cleaned.
[0015]
【The invention's effect】
As described above, according to the present invention, the compressed air 8 stays in the water pipe 4 without escaping, constantly applying air pressure to the mixer side, and the metered water in the water pipe is sprinkled at high pressure into the mixer. Compared with the conventional method, the pressure of the compressed air 8 to be supplied can be added to the measuring water 7 without loss, and water can be sprinkled at a higher pressure, so that the mixer can be more easily washed. Also, the measuring water 7 is pushed out by the compressed air 8 and sprinkled into the mixer 9 and the flow of the supplied compressed air causes the measuring water 7 to remain in the water pipe 4 without remaining as water in a water droplet state. After the water is sent to the mixer side and the watering of the measuring water 7 continues to drop, the watering of the measuring water can be performed in a short time without causing a dripping phenomenon.
Since all of the measured water 7 is sprinkled into the mixer 9 without any excess, the entire amount of the measured water 7 is used for kneading the concrete, and it is possible to produce high-quality concrete with moisture control. It becomes possible.
[Brief description of the drawings]
FIG. 1 is a side sectional view of an embodiment of the present invention.
FIG. 2 is a side sectional view of a step in which the water meter of the embodiment finishes measuring.
FIG. 3 is a side cross-sectional view of a step of sending measured water to a water pipe according to the embodiment.
FIG. 4 is a side sectional view of a step of sending compressed air to a water supply pipe and sprinkling metered water according to the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water meter 3 Air supply means 4 Water supply pipe 5 On-off valve 9 Mixer 13 Water intake part

Claims (1)

A water meter for measuring the water used for kneading the concrete, and a water pipe for sending the measured water measured by the water meter to the mixer are provided. In a mixer cleaning apparatus in a raw plant for performing washing, the water supply pipe is provided with a water intake part that is separated from a water meter and receives the measured water discharged from the water meter, and an air supply source. Air supply means for supplying compressed air into the water pipe, and an open / close valve provided to be openable and closable between a connection position of the air supply means and a water intake section, after the measured water is discharged from the water meter. A mixer cleaning device in a raw plant, wherein an on-off valve is closed, compressed air is supplied into a water supply pipe, air pressure is constantly applied to the mixer side, and measured water in the water supply pipe is sprinkled at high pressure into the mixer.

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