JP2003265991A - Apparatus for spraying chemical slurry and operation method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the structure of a spray apparatus for chemical slurry which often solidifies to plug a pipe line or a tank and to reduce the number of valves or pumps to be used while improving the cleaning effect of the apparatus. <P>SOLUTION: The spray apparatus for the chemical slurry is constituted of a slurry tank 10 having a chemical supply port 11 and provided with a stirrer 13 inside, a cleaning water tank 14, a spray nozzle 16, a slurry supply pipe 17 provided with a pump P in the middle and for supplying the chemical slurry in the slurry tank to the spray nozzle with the pump, a cleaning water supply pipe 18 one end of which is connected to the slurry supply pipe of the pump suction side and the other end of which is connected to the cleaning water tank, a branched pipe 19 which is branched from the slurry supply pipe in the pump discharge side and the tip of which is connected to the slurry tank, a 1st flow passage switching means 21 for selecting one of the chemical slurry from the slurry tank or the cleaning water from the cleaning water tank as the liquid flowing in the pump, a 2nd flow passage switching means 22 for selecting whether the liquid discharged from the pump is to be supplied to the slurry tank or the spray nozzle, and a means 20 for discharging the liquid in the slurry tank. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a drug slurry,
In particular, the present invention relates to a drug spraying device suitable for spraying a drug solution which has a property of solidifying and tends to be clogged when it remains in a pipe or a tank, and a method of operating the drug spraying device.

[0002]

2. Description of the Related Art
According to Japanese Patent No. 369, there is provided a drug slurry spraying device comprising a drug slurry spraying device, a cleaning device for cleaning the spraying device, and a control device for controlling the cleaning device, and the drug slurry spraying device is cleaned. By controlling the cleaning means to be controlled by the control means, the spraying means of the chemical slurry can be easily cleaned, and the chemical slurry which solidifies when remaining in the spraying means of the chemical slurry can be surely removed.

[0003]

However, since the above-mentioned prior device has a complicated structure, the piping system thereof is simplified, and the pumps and valves used are reduced to simplify the structure.
It has been desired to develop a device having a further improved cleaning effect.

[0004]

The present invention was developed in view of the above, and a spraying device for chemical slurry according to claim 1 has a chemical supply port and a slurry tank having a stirrer therein, and a cleaning device. A water tank, a spray nozzle, and a pump in the middle are provided, one end of which is connected to a slurry supply pipe for supplying the chemical slurry in the slurry tank to the spray nozzle by the pump, and a slurry supply pipe on the pump suction side, and the other end of which is washing water. A washing water supply pipe connected to the tank, a branch pipe branching from the slurry supply pipe on the discharge side of the pump and having a tip connected to the slurry tank, a liquid flowing through the pump being a chemical slurry from the slurry tank, or a washing water tank First flow path switching means for selecting whether to wash water from the above, whether to send the liquid discharged from the pump to the slurry tank or the spray nozzle Second flow path switching means for selecting,
And a means for discharging the liquid in the slurry tank. In this case, it is preferable that the second flow path switching means is a three-way valve, and the first flow path switching means is a slurry tank from a connection position between the valve provided in the cleaning water supply pipe and the cleaning water supply pipe. And a valve provided on the side slurry supply pipe. Further, a drain pipe having a valve capable of draining water in the casing may be connected to the casing of the pump.

Further, a slurry supply pipe having a chemical supply port and a stirrer inside, a washing water tank, a spray nozzle, and a pump in the middle, for supplying the chemical slurry in the slurry tank to the spray nozzle. , A cleaning water supply pipe having one end connected to the slurry supply pipe on the pump suction side and the other end connected to the cleaning water tank, a branch branched from the slurry supply pipe on the discharge side of the pump, and a tip connected to the slurry tank A pipe, a first flow path switching means for selecting whether the liquid flowing through the pump is a liquid from a slurry tank or a wash water tank, and whether the liquid discharged from the pump is fed to the slurry tank or sprayed A spraying device for a chemical slurry, comprising a second flow path switching means for selecting whether to feed to a nozzle and a means for discharging the liquid in the slurry tank. As a transfer method, the liquid flowing through the pump is selected as the chemical slurry by the first flow path switching means, and the chemical slurry discharged from the pump is fed by the second flow path switching means to the spray nozzle to form a slurry. While rotating the stirrer inside the tank, the chemical liquid spraying process of spraying the chemical slurry from the spray nozzle, and the liquid flowing through the pump by the first flow path switching means is selected as the wash water of the wash water tank, and the second flow is selected. The cleaning water discharged by the pump is sent to the slurry tank by the path switching means,
While the washing water was stored in the slurry tank to the extent that a part of the stirring blades of the stirrer was immersed, while rotating the stirrer,
It is characterized by having a slurry tank cleaning step of cleaning the inside of the slurry tank. In this case, after the slurry tank cleaning step, the liquid flowing through the pump is selected as the liquid (cleaning water) in the slurry tank by the first flow path switching means,
It may have a pipe and nozzle cleaning step for driving the pump so as to feed the liquid discharged by the pump to the spray nozzle by the second flow path switching means and cleaning the pipe system and the spray nozzle. Then, the slurry tank cleaning step and the piping / nozzle cleaning step may be repeated a plurality of times.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In each of the embodiments shown in the drawings, 10 is a slurry tank having an effective capacity of, for example, 1000 liters, and has a chemical agent supply port 11 which can be opened and closed by a lid and a fresh water supply pipe 12 on the upper surface. A stirrer 13 is internally provided around a horizontal shaft that is driven to rotate by a motor outside the tank and has radial stirring blades that are perpendicular to the shaft and / or have a certain angle.

A clean water tank 14 is supplied with clean water by a clean water supply pipe 15 and has an effective capacity of, for example, 700.
It is upright, and when the internal water level drops to a certain level, the pump automatically stops and is controlled as a mechanism for preventing seizure damage of pumps.

Reference numeral 16 is a spray nozzle for the chemical slurry, and a slurry supply pipe 17 having a pump P midway from the slurry tank 10 supplies the chemical slurry to the spray nozzle. 18
Is a cleaning water supply pipe having one end connected to the suction side of the pump P of the slurry supply pipe and the other end connected to the bottom of the cleaning tank, and 19 is a branch of the slurry supply pipe 15 from the discharge side of the pump P. The tip of the branch pipe is connected to the slurry tank 10 from above.

Reference numeral 21 indicates whether the liquid flowing through the pump P is the chemical slurry from the slurry tank 10 or the cleaning water tank 1
In the first flow path switching means for selecting whether the fresh water from 4
An on-off valve V-1 provided on the slurry supply pipe 17 and an on-off valve V-2 provided on the wash water supply pipe 18 are provided. Reference numeral 22 is a second flow path switching means for selecting whether to feed the liquid discharged by the pump P to the slurry tank or the spray nozzle, and at the branch point between the slurry supply pipe 17 and the connecting pipe 19. It consists of a three-way valve V-3 provided.

(Preparation Step of Chemical Slurry) First, a required amount of fresh water is injected into the inside of the slurry to supply the chemical supply port 11 of the slurry tank.
The lid is opened, and a necessary amount of the medicine is put into the inside, and the stirrer 13 is rotated forward and backward for a short time to stir the fresh water and the medicine to make a medicine slurry having a constant concentration inside the slurry tank.

(Process for spraying chemical slurry) From the fresh water supply pipe 12, the opening / closing valve V-1 of the first flow path switching means 21 is opened, the open / close valve V-2 is closed, and the second flow path switching means 22 is opened. The pump P is operated by opening the three-way valve V-3 to the spray nozzle side. As a result, the chemical slurry in the slurry tank is pressurized and supplied to the spray nozzle 16 through the slurry supply pipe 17, and is sprayed from the spray nozzle. It is preferable that the on-off valve V-1, the on-off valve V-2, the three-way valve V-3 and the three-way valve V-3 can be opened on the spray nozzle side, for example, electrically when the spray button is pressed.

(Cleaning Step of Chemical Slurry) After the spraying step of the chemical slurry is completed, the cleaning step is carried out to prevent the chemical slurry remaining in the slurry tank or the slurry supply pipe from solidifying. First, the opening / closing valve V-4 of the drainage pipe 20 of the slurry tank and the drainage pipe 23 of the pump P are used.
The opening / closing valve V-5 of No. 1 is opened, the blowing step of the chemical slurry remaining in the slurry tank and the pump P is performed, and then the opening / closing valve V-1 of the first flow path switching means 21 is closed,
The on-off valve V-2 is opened, the three-way valve V-3 of the second flow path switching means 22 is opened to the branch pipe 19 side, the flow from this three-way valve to the spray nozzle is stopped, the pump P is operated, and the washing is performed. The fresh water in the water tank is supplied to the slurry tank 10 to wash the slurry tank. At this time, the opening / closing valve V-4 of the drainage pipe 20 provided at the bottom of the slurry tank is opened to drain the cleaning wastewater that has cleaned the inside of the slurry tank to the outside. It is preferable that the on-off valve V-1 is closed, the on-off valve V-2 is opened, and the three-way valve V-3 is opened on the side of the branch pipe 19 so that it can be electrically and automatically performed, for example, by pressing a washing button. The opening / closing valve V-4 of the drain pipe 20 may be arbitrarily opened.

In cleaning the slurry tank, the cleaning water is stored in the tank to such an extent that a part of the stirring blade is immersed, and the stirrer is rotated. 11. The opening of the clean water supply pipe 12 can be cleaned. By increasing the number of rotations, the degree of impact increases and the cleaning effect also increases. Further, if the stirrer is rotated in the reverse direction, the direction in which the splashes fly will be reversed, and the parts that cannot be cleaned by the normal rotation can be cleaned. The extent to which the stirrer is immersed during cleaning is about 5 to 1 when the tip of the lower blade in the figure
It may be about 0 cm and submerged in water. In the above-mentioned prior apparatus, a plurality of cleaning nozzles were provided on the upper surface of the slurry tank so as to face downward, and the inside of the tank was cleaned by spraying from the nozzles, but this did not allow sufficient cleaning of the nozzle and its vicinity. However, in the present invention as in the illustrated embodiment, it is preferable to provide only the opening of the cleaning water supply pipe and the opening of the chemical supply port without providing the cleaning nozzle on the inner upper surface of the slurry tank. The inner upper surface can be cleaned cleanly. Further, fresh water is supplied to the slurry tank through the supply pipe 12 for adjusting the chemical slurry.
It is also possible to omit 2 and supply fresh water from the water supply truck by setting a hose inside the slurry tank when necessary from the opening of the chemical supply port 11. In this way, by making the chemical supply port on the upper surface of the inside of the slurry tank and the fresh water supply pipe simple openings and reducing the number of openings, it becomes easier to clean, and the chemical slurry adhering to them can be completely washed away. You can Further, in the illustrated slurry tank, the drain pipe 20 is provided at the bottom of the tank, but the drain pipe 20 may be provided separately from the slurry supply pipe as shown by the broken line in FIG. In this case, the opening / closing valve V- of the first flow path switching means
2 is closed and V-1 is opened, and then the opening / closing valve V- of the drain pipe 20
Open 4

After this cleaning step, the opening / closing valve V-1 of the first flow path switching means is opened and the opening / closing valve V-2 is closed, and the flow of the second flow path switching means is sprayed. It is made to flow toward the nozzle 16, or the branch pipe 1
9, a spray nozzle for operating the pump P to wash the slurry supply pipe 17 and the spray nozzle 16 and for washing the branch pipe 19,
Perform the pipe cleaning process. The above-mentioned blowing process of the chemical slurry in the previous stage and the washing process of the spraying nozzle and the pipe in the latter stage are collectively referred to as a pipe and nozzle washing process in this document.

The above-mentioned pipe / nozzle cleaning process and slurry tank cleaning process are repeated a plurality of times to complete the cleaning.

In the illustrated embodiment, the valve V-1 of the slurry supply pipe 17 and the valve V-2 of the wash water supply pipe 18 constitute the first flow path switching means 21, and the valves V-1, V The liquid passing through the pump P can be selected by opening and closing -2, but the valves V-1 and V-2 are omitted, and instead the junction point of the slurry supply pipe and the cleaning water supply pipe is used. A three-way valve may be provided. However, the three-way valve is preferable because the drug slurry is easily attached to the inside thereof.

The second flow path switching means 22 is, as shown in the figure, operated by a three-way valve V-3 provided at a branch point where a branch pipe from the slurry supply pipe is branched, and a liquid distribution direction spray nozzle and a slurry tank. And can be selected. However, instead of the three-way valve, on-off valves may be provided respectively on the pipes in three directions from the branch point. However, if a valve is provided in each pipe, the number of valves increases, so that the illustrated three-way valve is preferable.

[0018]

According to the present invention, the first flow path switching means,
By switching to and from the second flow path switching means, the chemical slurry in the slurry tank is pressurized and sprayed from the spray nozzle by using only a small amount of piping and one pump, and the fresh water in the wash water tank is slurried. The chemical slurry that is supplied to the tank and remains in the slurry tank is washed with pressurized wash water (fresh water) from the pump and discharged from the drain pipe to the outside,
The inside of the slurry supply pipe from the pump to the spray nozzle can be washed with pressurized washing water to completely remove the drug slurry.

Further, the inside of the upper wall of the slurry tank is only opened with the supply port for the chemicals to be blocked by the lid and the supply pipe for fresh water, and the downward washing nozzle is not attached, so the agitator is rotated in the forward and reverse directions. Then, the inside of the tank can be washed away without leaving the drug slurry.

[Brief description of drawings]

FIG. 1 is a flow chart of an embodiment of a chemical slurry spraying device of the present invention.

[Explanation of symbols]

P pump 10 Slurry tank 11 Chemical supply port of slurry tank 12 Fresh water supply pipe to slurry tank 13 Agitator for slurry tank 14 Wash water tank 15 Fresh water supply pipe to the wash water tank 16 Spraying nozzle for chemical slurry 17 Slurry supply pipe 18 Wash water supply pipe 19 Branch pipe 20 Slurry tank drain pipe 21 First flow path switching means V-1, V-2 open / close valve 22 Second flow path switching means V-3 three-way valve 23 Drain pipe from motor

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takayuki Mizunari             Kurita, 3-4-3 Nishi-Shinjuku, Shinjuku-ku, Tokyo             Industry Co., Ltd. F term (reference) 2B121 CB02 CB25 CB52 CB53 CB62                       FA02 FA06                 4D073 AA04 AA09 BB03 CA01 CB03                       CC03 CC13

Claims (7)

[Claims] 1. A slurry tank having a chemical supply port and a stirrer inside, a washing water tank, a spray nozzle, and a pump in the middle, and the chemical slurry in the slurry tank is supplied to the spray nozzle by the pump. Slurry supply pipe, one end is connected to the slurry supply pipe on the pump suction side, the other end is connected to the cleaning water tank, and the other end is branched from the slurry supply pipe on the discharge side of the pump, and the tip is connected to the slurry tank. Connected branch pipe, first selecting liquid flowing through the pump as chemical slurry from a slurry tank or cleaning water from a cleaning water tank
Flow path switching means, second flow path switching means for selecting whether the liquid discharged from the pump is fed to the slurry tank or the spray nozzle, and the liquid in the slurry tank is discharged. An apparatus for spraying a chemical slurry, which comprises: 2. The chemical slurry spraying device according to claim 1, wherein the second flow path switching means is a three-way valve. 3. The chemical slurry spraying device according to any one of claims 1 and 2, wherein the first flow path switching means includes a valve provided in the cleaning water supply pipe and a cleaning water supply pipe. A spray device for chemical slurry, comprising: a valve provided on a slurry supply pipe on the side of a slurry tank from a connection position. 4. The spraying device for chemical slurry according to claim 1, wherein a discharge pipe having a valve capable of discharging water in the casing is connected to the casing of the pump. Dispersing device for chemical slurry. 5. A slurry tank having a chemical supply port and having a stirrer inside, a wash water tank, a spray nozzle, and a pump in the middle, and the chemical slurry in the slurry tank is supplied to the spray nozzle by the pump. Slurry supply pipe, one end is connected to the slurry supply pipe on the pump suction side, the other end is branched from the wash water supply pipe connected to the wash water tank, the slurry supply pipe on the discharge side of the pump, the tip to the slurry tank Connected branch pipe, first flow path switching means for selecting the liquid flowing through the pump as the chemical slurry from the slurry tank or the wash water from the wash water tank, and sending the liquid discharged from the pump to the slurry tank A chemical slurry comprising a second flow path switching means for selecting whether to supply the liquid or to the spray nozzle, and a means for discharging the liquid from the slurry tank. A method for operating a spraying device according to claim 1, wherein the liquid flowing through the pump is selected as the chemical slurry by the first flow path switching means, and the chemical slurry discharged from the pump is sent to the spraying nozzle by the second flow path switching means. The chemical liquid spraying step of spraying the chemical slurry from the spraying nozzle while rotating the stirrer inside the slurry tank so as to supply the liquid flowing through the pump to the wash water of the wash water tank by the first flow path switching means. The agitator is selected, and the wash water discharged from the pump by the second flow path switching means is fed to the slurry tank, and the wash water is stored in the slurry tank to such an extent that a part of the rotor blades of the agitator is immersed. And a slurry tank cleaning step of cleaning the inside of the slurry tank while rotating the machine. Law. 6. The method for operating a spraying apparatus for chemical slurry according to claim 5, wherein after the slurry tank cleaning step,
The first flow path switching means selects the liquid flowing through the pump as the liquid (cleaning water) in the slurry tank, and the second flow path switching means sends the liquid discharged by the pump to the spray nozzle. A method for operating a chemical spraying device, comprising a pipe for driving and cleaning a pipe system and a spraying nozzle, and a nozzle cleaning step. 7. The method of operating a chemical slurry spraying device according to claim 6, wherein the slurry tank cleaning step and the piping / nozzle cleaning step are repeated a plurality of times.