WO2016170591A1

WO2016170591A1 - Mixed gas jet spray device

Info

Publication number: WO2016170591A1
Application number: PCT/JP2015/062048
Authority: WO
Inventors: 和政山上; 亮二山田; 幹夫魚尾
Original assignee: シブヤマシナリー株式会社
Priority date: 2015-04-21
Filing date: 2015-04-21
Publication date: 2016-10-27
Also published as: KR20170139054A; JPWO2016170591A1; JP6432749B2; KR102300363B1; CN107530862A

Abstract

A first tank (12) holding sodium bicarbonate (11) and a second tank (15) holding an abrasive cleaning agent (14) are provided separately in a gas passage (8). When compressed air (A) flows through the gas passage (8) towards a spray nozzle (2), first sodium bicarbonate (11) in the first tank (12) is fed into the compressed air (A), and then the abrasive cleaning agent (14) in the second tank (15) is fed into the compressed air (A). As a result, the sodium bicarbonate (11) and the abrasive cleaning agent (14) are mixed into the compressed air (A) in prescribed proportions. Said compressed air (A) is mixed with high-pressure water (3) inside the spray nozzle (2) to become a mixed gas jet (J) and is sprayed on the outer surface (Wa) of a ship hull (W). Since variation in the proportions of the sodium bicarbonate (11) and the abrasive cleaning agent (14) contained in the mixed gas jet (J) does not occur, when peeling a coating film on the outer surface (Wa) of a ship hull (W), the mixed gas jet (J) is able to efficiently peel the coating film evenly in the entire area where the mixed gas jet (J) is sprayed and it is possible to obtain effective rust prevention.

Description

Air-jet injection device

The present invention relates to an air-jet injection device, and more particularly, to inject an air-fuel jet in which a high-pressure liquid and gas are mixed with a rust preventive and an abrasive to a structure such as a steel hull or a pier. Thus, the present invention relates to an air-fueled jet ejecting apparatus that performs pre-coating ground treatment on the outer surface of a structure, peeling or cleaning of a coating film, and the like.

Conventionally, after mixing powdered baking soda and scouring material into compressed air flowing through the gas passage, mixed air and high-pressure water containing the baking soda and scouring material are mixed in the nozzle to create an air-jet A technique for injecting it onto an object to be processed from an injection nozzle is known (see paragraphs 0035 to 0041 of Patent Document 1). Such a conventional air-fuel mixture jet injection apparatus can efficiently perform, for example, a pretreatment before coating a hull made of steel, a peeling operation of a paint film on the hull, and the like.

International publication WO2014 / 045607A1

By the way, the following problems are pointed out in the apparatus of Patent Document 1. That is, in the apparatus of Patent Document 1, a supply tank is connected in the middle of a gas passage through which compressed air flows, and sodium bicarbonate and polishing material mixed in advance at a predetermined ratio are accommodated in the supply tank. I have to. For this reason, in the apparatus of Patent Document 1, it is necessary to separately provide a mixing apparatus for mixing sodium bicarbonate and the abrasive in a predetermined ratio in advance, and there is a problem that the manufacturing cost increases accordingly.
In addition, a predetermined ratio of baking soda and the scouring material mixed in advance are accommodated in the supply tank, but the baking soda and the scouring material in the supply tank are separated due to the difference in particle size and specific gravity. For this reason, there is a variation in the ratio of baking soda and abrasive when supplying baking gas and abrasive from the supply tank to the gas passage, even though the baking soda and abrasive in the supply tank are agitated by the stirring device. As a result, there is a problem that rust is generated immediately because the rust preventive effect is lowered in a portion where a small amount of baking soda is ejected as a rust preventive material.
In addition, in the apparatus of Patent Document 1, when a liquid mixed with sodium bicarbonate in advance is used as high-pressure water, the pump for feeding the liquid to the nozzle is damaged because the liquid contains sodium bicarbonate particles. There was also a problem that it was easy.

In view of the circumstances described above, the present invention provides an injection nozzle that injects an air-fueled jet obtained by mixing a high-pressure liquid and a high-pressure gas toward the object to be processed, a high-pressure liquid supply source that supplies the high-pressure liquid, A liquid passage that connects the high-pressure liquid supply source and the injection nozzle, a high-pressure gas supply source that supplies high-pressure gas, and a gas passage that connects the high-pressure gas supply source and the injection nozzle. In the high-pressure gas, the anti-rust agent and the abrasive are mixed, and in the spray nozzle, the high-pressure liquid is mixed with the high-pressure gas in which the anti-rust material and the abrasive are mixed. In the mixed-air jet injection device configured to:
The first tank for storing the rust preventive powder and the second tank for storing the scouring material are provided separately, and the rust preventive powder of the first tank and the scouring material of the second tank are provided. A supply device that supplies gas passages at a predetermined rate is provided.

According to such a configuration, the ratio of the rust preventive powder mixed with the high-pressure gas and the polishing material can be maintained at a predetermined ratio. Therefore, for example, when performing the peeling operation of the coating film on the hull by the mixed-air jet injection device of the present invention, the coating film can be efficiently and uniformly peeled over the entire area where the mixed-air jet is injected. High antirust effect can be obtained.

The block diagram which shows one Example of this invention. Sectional drawing of the nozzle shown in FIG. The block diagram which shows 2nd Example of this invention.

Hereinafter, the present invention will be described with reference to the illustrated embodiments. In FIGS. 1 to 2, the mixed-air jet injection device 1 is configured such that, for example, the mixed-jet J is supplied from the injection nozzle 2 toward the steel hull W as a processing object. By spraying, the coating film on the outer surface Wa of the hull W can be peeled off and the pretreatment before coating the outer surface Wa can be performed.
The mixed-air jet injection device 1 connects an injection nozzle 2 that injects the mixed-air jet J toward an object to be processed, a liquid supply source 4 that stores water 3 ′, and a liquid supply source 4 and the injection nozzle 2. A liquid passage 5 comprising a conduit, and a high-pressure pump 6 provided in the liquid passage 5 to feed water 3 ′ in the liquid supply source 4 to the injection nozzle 2 as high-pressure water 3. The water 3 ′ is supplied to the injection nozzle 2 as high-pressure water 3 after the high-pressure pump 6.
The mixed-jet injection apparatus 1 includes a compressed air supply source 7 that is a supply source of compressed air A, a gas passage 8 that connects the compressed air supply source 7 and the injection nozzle 2, and sodium bicarbonate as a rust preventive material. 11, a first feeder 13 for supplying baking soda 11 from the first tank 12 into the gas passage 8, and a polishing material 14 disposed downstream of the first tank 12. A second tank 15, a second feeder 16 that supplies the blast material 14 from the second tank 15 into the gas passage 8, and a controller 17 that controls the operation of the drive portion of the above-described components are provided. As will be described in detail later, in this embodiment, the baking soda 11 and the polishing material 14 are mixed into the compressed air A in the gas passage 8 through the first feeder 13 and the second feeder 16 at a predetermined ratio. It is a feature.

As shown in FIG. 2, the injection nozzle 2 includes a liquid nozzle 2 A in its internal space, and a gas nozzle 2 B provided to surround the liquid nozzle 2 A. Further, the internal space adjacent to the tips of the liquid nozzle 2A and the gas nozzle 2B is a mixing chamber 2C, and the adjacent portion of the mixing chamber 2C is a tip portion 2D facing outward.
When the high-pressure pump 6 is operated, the high-pressure water 3 fed through the liquid passage 5 by the high-pressure pump 6 is injected from the liquid nozzle 2A, and at the same time, the baking soda fed through the gas passage 8 When the compressed air A in which 11 and the polishing material 14 are mixed is jetted from the gas nozzle 2B, the high-pressure water 3 and the compressed air A that have been formed into droplets in the mixing chamber 2C are mixed into an air-jet J. The air-fuel mixture jet J is jetted toward the object to be processed from the tip 2D. As described above, by injecting the mixed air jet J from the injection nozzle 2 toward the processing object, the processing object in which the mixed air jet J is injected, for example, rust prevention or roughening of the outer surface Wa of the hull W, etc. It is possible to perform the base treatment and peeling of the coating film. The configuration of the injection nozzle 2 is conventionally known (see, for example, JP-A-2006-123141).

In the present embodiment, a water tank storing water 3 ′ is used as the liquid supply source 4. When the water level in the liquid supply source 4 falls below a predetermined height, a required amount of water 3 ′ is supplied to the liquid supply source 4 by a supply pump (not shown). Thereby, a predetermined amount or more of water 3 'is always stored in the liquid supply source 4. The operation of the high pressure pump 6 is controlled by the control device 17. When the motor of the high pressure pump 6 is operated by the control device 17, the water 3 ′ in the liquid supply source 4 is supplied to the liquid passage 5 and the high pressure pump. 6 is supplied to the injection nozzle 2 as high-pressure water 3. In the present embodiment, the pressure of the high-pressure water 3 fed from the high-pressure pump 6 is 25 to 70 MPa.

Next, in this embodiment, a compressor is used as the compressed air supply source 7, and when an automatic valve (not shown) for the compressor is opened by the control device 17, the compressed air A flows from the compressed air supply source 7 to the gas passage. 8 is fed to the gas nozzle 2B of the injection nozzle 2. The pressure of the compressed air A from the compressed air supply source 7 is set to 0.4 to 0.8 MPa.
In this embodiment, the baking soda 11 in the first tank 12 is first mixed into the compressed air A flowing in the gas passage 8 from the compressed air supply source 7 toward the injection nozzle 2, and then the downstream second tank. Fifteen polishing materials 14 are mixed. As a result, the baking soda 11 and the polishing material 14 are mixed into the compressed air A at a predetermined ratio, whereby the compressed air A having a desired mixing ratio is injected from the gas nozzle 2B of the injection nozzle 2. It has become so. Thereby, in the mixing chamber 2C of the injection nozzle 2, the compressed air A containing the baking soda 11 and the polishing material 14 at a predetermined ratio and the high-pressure water 3 are mixed to create an air-jet J. ing. The mixing ratio means the mixing ratio of baking soda 11 to the polishing material 14.

In the present embodiment, the first tank 12 and the first feeder 13 are arranged at positions close to the compressed air supply source 7 on the upstream side of the second tank 15 and the second feeder 16 in the gas passage 8.
A discharge port 12 A is formed at the lower end of the first tank 12, and the first feeder 13 is disposed across the discharge port 12 A and the gas passage 8. The inlet 12B above the first tank 12 can be opened and closed by a lid 12C, and the baking soda 11 can be introduced into the first tank 12 by opening the lid 12C. When the inlet 12B is closed by the lid 12C, the inside of the first tank 12 is sealed.
A stirrer 22 that rotates in conjunction with the motor 21 is provided in the first tank 12, and the motor 21 is driven by the control device 17 when necessary. When the motor 21 is rotated by the control device 17 when necessary, the stirrer 22 is rotated, so that the baking soda 11 in the first tank 12 is stirred. The stirred sodium bicarbonate 11 is supplied into the first feeder 13 from the discharge port 12A. In this embodiment, sodium bicarbonate 11 (sodium hydrogen carbonate) is used as a rust preventive material, but potassium bicarbonate (particle size 180 to 300 μm) may be used instead of sodium bicarbonate 11.

The first feeder 13 has a cylindrical casing 13A in which a connecting portion 13a at the tip is connected to the gas passage 8, a spiral screw 13B provided rotatably in the casing 13A, and the screw 13B. And a motor 13C. The discharge port 12A of the first tank 12 is connected to an introduction port (not shown) formed on the upper surface of the casing 13A while maintaining airtightness. Therefore, the baking soda 11 falls and is supplied from the outlet 12A into the casing 13A.
The operation of the motor 13C is controlled by the control device 17, and the screw 13B is rotated when the motor 13C is rotated by the control device 17 when necessary. Along with this, the baking soda 11 is dropped and supplied from the discharge port 12A of the first tank 12 into the casing 13A, and then the baking soda 11 in the casing 13A is sent out by the screw 13B and gas passage from the connecting portion 13a of the casing 13A. 8 is supplied.
The control device 17 can change the rotation speed of the screw 13B by controlling the rotation speed of the motor 13C, and thereby the supply amount per unit time of the baking soda 11 supplied from the first feeder 13 to the gas passage 8 can be changed. It can be changed to a predetermined supply amount. In this embodiment, the amount of sodium bicarbonate 11 supplied to the gas passage 8 by the first feeder 13 can be changed between 10 and 300 cc / min.
A pressure adjusting pipe 23 is disposed across the casing 13 A and the upper portion of the first tank 12. When the pressure of the compressed air A in the gas passage 8 acts in the casing 13A from the connecting portion 13a, the pressure of the compressed air A is also introduced into the upper space in the first tank 12 via the pressure adjusting pipe 23. It has become so. Thereby, the pressure in the upper space in the casing 13A and the first tank 12 is balanced, so that the baking soda 11 in the casing 13A is not fed back into the first tank 12.

Next, the second tank 15 disposed on the downstream side of the first tank 12 will be described. A discharge port 15 A is formed at the lower end of the second tank 15 containing the polishing material 14, and a second feeder 16 is provided across the discharge port 15 A and the gas passage 8.
The charging port 15B above the second tank 15 can be opened and closed by a lid 15C, and the polishing material 14 can be charged into the second tank 15 by opening the lid 15C. When the inlet 15B is closed by the lid 15C, the inside of the second tank 15 is sealed. In this embodiment, any one of copper slag having a particle diameter of 0.1 to 2 mm, silica sand, and steel grid is used as the polishing material 12 accommodated in the second tank 15. Since the abrasive 12 is hard to solidify, it is naturally dropped by its own weight and supplied to the second feeder 16 from the discharge port 15A.

The second feeder 16 has the same configuration as the first feeder 13. That is, the second feeder 16 includes a cylindrical casing 16A in which a connecting portion 16a at the tip is connected to the gas passage 8, a spiral screw 16B that is rotatably provided in the casing 16A, and the screw 16B. And a motor 16C for rotating the motor. A discharge port 15A of the second tank 15 is connected to an introduction port (not shown) formed on the upper surface of the casing 16A while maintaining airtightness.
The operation of the motor 16C is controlled by the control device 17. When the motor 16C is rotated by the control device 17 when necessary, the screw 16B is rotated. Along with this, the polishing material 14 drops and is supplied into the casing 16A from the discharge port 15A of the second tank 15, and then the polishing material 14 in the casing 16A is sent out by the screw 16B and gas is supplied from the connecting portion 16a. It is supplied into the passage 8.
By changing the rotation speed of the screw 16B via the motor 16C, the supply amount per unit time of the abrasive 14 supplied from the second feeder 16 to the gas passage 8 can be changed to a predetermined supply amount. ing. Specifically, the supply amount of the polishing material 14 from the second feeder 16 to the gas passage 8 is 0.5 to 3 liters / min.
In addition, a pressure adjusting pipe 24 that communicates between the casing 16 A and the upper space in the second tank 15 is disposed. When the pressure of the compressed air A in the gas passage 8 acts on the casing 16A via the connecting portion 16a, the pressure of the compressed air A acts on the upper space in the second tank 15 via the pressure adjusting pipe 24. It is supposed to let you. Thereby, the pressure in the upper space in the casing 16 A and the second tank 15 is balanced, so that the polishing material 14 in the casing 16 A is not fed back into the second tank 15.

The air-fuel mixture jet injection apparatus 1 according to the present embodiment is configured as described above. By injecting the air-fuel mixture jet J to the object to be processed from the injection nozzle 2 of the air-fuel mixture jet injection apparatus 1, the required mixture is obtained. Processing can be performed.
That is, when the control device 17 operates the motors of the

motors

13C, 16C, and 21 and the high-pressure pump 6, the high-pressure pump 6 supplies the high-pressure water 3 to the injection nozzle 2 through the liquid passage 5 and compresses it. Compressed air A from the air supply source 7 is supplied to the injection nozzle 2 through the gas passage 8. The compressed air A flowing from the compressed air supply source 7 to the injection nozzle 2 through the gas passage 8 is first mixed with the baking soda 11 in the first tank 12 by the first feeder 13, and then the second feeder 16 performs the second operation. The polishing material 14 of 2 tanks 15 is mixed. Then, the compressed air A in which the baking soda 11 and the polishing material 14 are mixed at a predetermined ratio is supplied to the injection nozzle 2 so that the compressed air A and the high-pressure water 3 are mixed and mixed in the injection nozzle 2. The jet J is jetted from the tip 2D toward the outer processing object.
Here, when the object to be processed by the air-fuel mixture jet injection device 1 is, for example, a steel hull W, and the work of peeling off the coating of the outer surface Wa is performed, the air-fuel mixture jet J is injected toward the outer surface Wa. By doing so, the coating of the outer surface Wa can be efficiently peeled off. When performing the paint peeling operation, for example, the following mixed air jet J is sprayed.
Types of abrasive 14: copper slag, silica sand, steel grid (particle size 0.1-2mm)
Supply amount of abrasive 14: 0.5-3 liters / min
Antirust material powder: baking soda, potassium bicarbonate (particle size 180-300μm)
Rust preventive powder supply amount: 10 to 300 cc / min (may be 3 to 5% by weight with respect to the abrasive)
Discharge pressure of the high-pressure pump 6: 25 to 70 MPa
Pressure of compressed air A: 0.4 to 0.8 MPa
When the mixed air jet injection device 1 of the present embodiment performs the peeling operation of the coating film on the outer surface Wa of the hull W, the ratio of the baking soda 11 and the polishing material 14 included in the mixed air jet J is a predetermined ratio. There is no variation. Therefore, the conventional problem as described above does not occur during the peeling operation.

According to the mixed-air jet injection device 1 of the present embodiment, the surface of a structure using a steel material such as a ship, a bridge pier or the like is roughened before coating, the welded portion is cleaned and peeled off, and the coating is peeled off when repainting is performed. , And cleaning of dirt during maintenance can be performed. The required processing can be efficiently performed by changing the type and supply amount of the polishing material 14 in accordance with the difference between the processing object and the processing content by the mixed-air jet injection device 1.
For example, when the welded portion of a ship or a structure made of steel is cleaned by the mixed-jet injection device 1, the mixed-jet J is injected under the following conditions.
Type of abrasive 14: Copper slag (particle size 1-2mm)
Supply amount of abrasive 14: 1 liter / min
Antirust material powder: Baking soda (average particle size 240μm: E grade)
Rust preventive powder supply rate: 50cc / min
High pressure pump 6 discharge pressure: 35 MPa
Pressure of compressed air A: 0.7 MPa
Furthermore, in the case of roughening the surface before painting of a ship or structure made of steel by the mixed air jet injection device 1, the mixed air jet J is injected under the following conditions.
Type of abrasive 14: Copper slag (particle size 1-2mm)
Supply amount of abrasive 14: 3 liters / min
Antirust material powder: Baking soda (average particle size 240μm: E grade)
Supply amount of rust preventive powder: 120cc / min
High pressure pump 6 discharge pressure: 35 MPa
Pressure of compressed air A: 0.7 MPa
Thus, the required processing can be efficiently performed by changing the type and the supply amount of the abrasive 14 according to the difference between the processing object and the processing content by the mixed-air jet injection device 1.
In the above embodiment, the second tank 15 is not provided with a stirrer, but the second tank 15 is provided with a stirrer 22 similar to the first tank 12 so that the second tank 15 has a stirrer. The abrasive 14 may be agitated.
Moreover, in the said Example, the arrangement position of the 1st tank 12 and the 1st feeder 13 and the arrangement position of the 2nd tank 15 and the 2nd feeder 16 may be reverse. That is, the second tank 15 and the second feeder 16 may be disposed on the upstream side in the gas passage 8, and the first tank 12 and the first feeder 13 may be disposed on the downstream side of these.

Next, FIG. 3 shows a second embodiment of the present invention. In the first embodiment, the

tanks

12 and 15 are arranged at different positions in the gas passage 8, the first feeder 13 is provided in the first tank 12, and the second feeder 16 is provided in the second tank 15. However, in the second embodiment, both

tanks

12 and 15 are separately provided in the middle of the gas passage 8, and a predetermined ratio of the baking soda 11 and the abrasive 14 are compressed in the gas passage 8 by a single feeder 100. The air A is supplied.
More specifically, the feeder 100 according to the second embodiment includes a casing 100A that is formed in a cylindrical shape and has a connecting portion 100a at the tip end connected to the gas passage 8, and a spiral shape that is rotatably provided in the casing 100A. And a motor 100C for rotating the screw 100B.
The discharge port 15A of the second tank 15 is connected to the upper portion of the casing 100A near the connection portion 100a while maintaining airtightness, and the discharge port 12A of the first tank 12 is connected to the upper portion of the casing 100A near the motor 100C. Keeping airtight and connected. The configurations of the first tank 12 and the second tank 15 are the same as those in the first embodiment, and the same reference numerals are given to the portions corresponding to those in the first embodiment. As described above, the baking soda 11 is accommodated in the first tank 12, and the polishing material 14 is accommodated in the second tank 15.
The operation of the motor 100C is controlled by the control device 17, and when the motor 100C is rotated by the control device 17 when necessary, the screw 100B is rotated.
Here, in the present embodiment, the pitch of the blade portions that follow each other in the screw 100 B is different between the lower region of the second tank 15 and the lower region of the first tank 12. More specifically, the pitch P2 of the blade member in the lower region of the second tank 15 in the screw 100B is larger than the pitch P1 of the blade member in the lower region of the first tank 12 by a predetermined value. Thereby, when the screw 100B is rotated, the ratio of the baking soda 11 and the polishing material 14 delivered by the screw 100B can be set to a predetermined ratio, and the baking soda 11 and the polishing material 14 of the predetermined ratio are fed to the feeder. 100 can be mixed into the compressed air A in the gas passage 8.
Other configurations are the same as those of the first embodiment, and the same reference numerals are given to the respective parts corresponding to those of the first embodiment. Even in the second embodiment, the same effect as that of the first embodiment can be obtained.
In addition, the air-fuel | gaseous jet injection apparatus 1 of 2nd Example is suitable when performing the roughening process before the coating of the surface of the structure which consists of steel materials.

DESCRIPTION OF SYMBOLS 1 ... Mixed-air jet injection device 2 ... Injection nozzle 3 ... Water 4 ... Liquid supply source 5 ... Liquid passage 6 ... High pressure pump 7 ... Compressed air supply source 8 ... Gas passage 11 ... Baking soda (rust prevention material) 12 ... First tank 13 ... First feeder 14 ... Cleaning material 15 ... Second tank 16 ... Second feeder J ... Mixed air jet W ... Hull (object to be treated)

Claims

An injection nozzle that injects an air-fuel jet in which a high-pressure liquid and a high-pressure gas are mixed toward an object to be processed, a high-pressure liquid supply source that supplies high-pressure liquid, the high-pressure liquid supply source, and the injection nozzle. A liquid passage to be connected; a high-pressure gas supply source for supplying a high-pressure gas; and a gas passage for connecting the high-pressure gas supply source to the injection nozzle. A mixed-jet injection device configured to mix a scavenging material and mix a high-pressure liquid with a high-pressure gas in which the rust preventive material and the polishing material are mixed in the injection nozzle to form the mixed-gas jet. In
The first tank for storing the rust preventive powder and the second tank for storing the scouring material are provided separately, and the rust preventive powder of the first tank and the scouring material of the second tank are provided. An air-fueled jet injection device comprising a supply device that supplies gas passages at a predetermined rate.
A first tank is provided on the upstream side of the gas passage, and a first supply device for supplying a rust preventive material from the first tank to the gas passage is provided at a position where the first tank is provided. The second tank is provided on the downstream side of the position of one tank, and a second supply device for supplying the abrasive from the second tank to the gas passage is provided at the position where the second tank is provided. The mixed-air jet injection device according to claim 1.
The supply device is provided at a required position in the gas passage. The supply device is provided in a single casing to which the discharge port of the first tank and the discharge port of the second tank are connected, and the casing. And the pitch of the blade members that follow each other is different between the position below the discharge port of the first tank and the position below the discharge port of the second tank. The air-fuel mixture jet injection device according to claim 1, wherein