JPS606352A - Wet type blast device - Google Patents

Abstract

PURPOSE:To make the recovery of abrasives and flushed impurities ever so easy, by jetting a mixed solution of a low boiling point solvent and an abrasive, and flushing and degreasing a processed work as well as making the flushing impurities removed from the abrasive and the processed work into a state of dryness. CONSTITUTION:Dichlorodifluoromethane gas is contained in these flushing impurities or abrasives stored in a sludge tank 22 and a recovery tank 24 but when valves V5, V9, V13 and so on are operated, lines 46 and 47 of these tanks 22 and 24 are interconnected to lines 31 and 48 at the suction side of a compressor 8 whereby the said methane gas inside both tanks 22 and 24 is vapored and recovered by dint of suction of the compressor 8 so that these flushing impurities and abrasives left behind inside these tanks 22 and 24 become dryness enough in a short time, thus treatment for these recovered abrasives and flushing impurities is extremely made ever so easy.

Description

[Detailed Description of the Invention] Technical Field The present invention is a method of grinding objects to be processed such as mechanical parts by projecting a liquid mixture containing abrasive grains, which is an abrasive, onto objects to be processed, such as dirt, oil, rust, etc. attached to the objects. The present invention relates to wet-type plastic fittings that perform grinding of surface-fixed materials, surface hardening, etc.

BACKGROUND ART Conventionally, this type of wet blasting apparatus has a structure in which a liquid mixture of water and abrasive particles such as alumina or glass beads is injected from a nozzle together with compressed air. By spraying the 4-bicycle mixture, dirt and other adhered substances adhering to the surface and gaps of the object to be treated are removed, and surface effects are processed.

However, since the above-mentioned conventional wet blasting equipment uses water as the spray liquid, sufficient cleaning and degreasing effects cannot be obtained, it takes time to process the workpiece, and the workpiece after grinding is It takes time to dry the processed material. In addition, since it contains water, it is difficult to collect the used abrasive, and it is troublesome to dispose of the filth that has been removed by grinding.

Purpose The present invention has been made in view of the conventional problems as described above, and its purpose is to effectively clean and degrease the workpiece by using a low boiling point solvent in the mixed liquid. It is an object of the present invention to provide a wet blasting apparatus which has been realized and can easily collect and process cleaning dirt removed from an abrasive material and an object to be treated in a dry state.

Embodiment Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

In a diagram showing the basic configuration of a wet blasting apparatus according to an embodiment of the present invention, reference number 1 is a processing container for processing objects (not shown) such as contaminated tools in a nuclear power plant; It is a closed structure. Processing container 1
A mixed liquid 2 made of a mixture of Freon, which is a low boiling point solvent, and an abrasive material such as alumina or glass beads is stored in a tank 3 provided at the bottom of the tank. 4 is an injection nozzle. The mixed liquid 2 in the tank 3 is sent to the line 30 by the pump 6.
It is sent through the valve V8 and is ejected from the injection nozzle 4 onto the object to be processed placed in the processing container 1 together with a fluorocarbon gas which will be described later.

The spouted mixed liquid 2 returns to the tank 3 together with the solid matter removed from the object to be treated, but some of the fluorocarbon liquid is vaporized and is sent from the waste tube at the top of the processing container 1 to the line 31 where the filter 7 and valve V2 are located. and is sent to the compressor 8. The filter 7 is for removing particulates such as abrasives contained in the fluorocarbon gas. The fluorocarbon gas sent to the compressor 8 via the line 31 is compressed and becomes high pressure gas, which passes through the oil separator 9 and the dryer 10 to the line 32 and the valve v1.
The mixed liquid 2 is injected as a pressurized source through which the mixed liquid 2 is sucked up by the pump 6 described above. During operation, a continuous equilibrium state is maintained by the above circulation system.

Here, since the lubricating oil in the compressor 8 mixes with the freon gas, the oil separator 9 removes it and returns it to the compressor 8 via the lines 33 and 34. This reduces lubricant consumption. The dryer 10 removes moisture contained in the air since residual air in the processing container l mixes with the fluorocarbon gas.

In addition, the line 30 and the injection nozzle 4 are
A part of the liquid mixture 2 circulating at high speed in the tank 3 is diverted to the stirring line 35 and directly returned to the tank 3. By returning from this stirring line 35, the mixed liquid 2 in the tank 3
This ensures that the fluorocarbon solution and the abrasive particles are mixed uniformly, and that only the abrasive particles are prevented from settling.

Now, since the mixed liquid 2 and the fluorocarbon gas injected from the injection nozzle 4 are suddenly released from the high pressure state, the self-cooling action of the fluorocarbon gas acts and the temperature decreases. On the other hand, the temperature of the mixed liquid 2 that is circulated at high speed by the pump 6 increases due to the heat generated by the stirring described above, but in order to balance with the temperature drop mentioned above, the temperature in the processing container 1 and the temperature of the mixed liquid 2 in the tank 3 will decrease. The temperature is kept below the boiling point of chlorofluorocarbons at atmospheric pressure.6 Therefore, even if the opening/closing door is opened when the object to be processed is taken into or taken out of the processing container i, the consumption of fluorocarbons due to evaporation can be minimized. In addition, by increasing the amount of fluorocarbon gas suctioned by the compressor 8 than the amount ejected from the nozzle 4 to maintain the inside of the processing container at a negative pressure compared to the outside air at all times during operation, gas leakage is prevented and contaminants are leaked to the outside. is prevented.

A part of the high-pressure fluorocarbon gas discharged from the compressor 8 is divided into lines 36 and sent to the liquefier 12 via the pressure valve 11. The pressure valve 11 is used to adjust suction and discharge by the compressor 8, and is used to drain excess gas to the liquefier 12 so that the flow of fluorocarbon gas from the processing container 1 to the processing container 1 via the lines 31 and 32 maintains an equilibrium state. The liquefier 12 liquefies the sent fluorocarbon gas by the cooling layer 2-1, and removes the residual air mixed in the fluorocarbon gas through the exhaust pipe 1.
Minute # from 2-1: Can be completely removed.

Further, the liquefied fluorocarbon is sent from the liquefier 12 to the distiller 13 via a line 37 and a valve V3.

The freon sent to the distiller 13 is evaporated by heating by the heater 14 and condensed again by the cooler 13-1 from the refrigerator 19, and then sent to the next liquid reservoir 1 via the line 38.
Sent to 6. In addition, 15 is a water separator, and distiller 1
Remove residual moisture in 3. In addition, the oil separated from the fluorocarbons by the second distillation and accumulated at the bottom of the distiller 13 (the lubricating oil of the compressor 8 that could not be completely removed by the oil separator 9) is transferred to the compressor 8 via a line 39. be returned.

The liquid reservoir 16 includes a cooler 16-1 including a refrigerator 19 to store distilled clean fluorocarbon. It also includes a liquid supply port 17 for supplying new liquid. A liquid supply pump 18 connected to the liquid storage device 16 supplies the stored fluorocarbon to the tank 3 in the processing container 1 through a line 40, and also supplies it to the injection nozzle 4.
The processed object is sent to the cleaning nozzle 5 for final cleaning. The fluorocarbon liquid is supplied to the cleaning nozzle 5 via a line 41 that branches off from a line 40. Also, the supply to the tank 3 and cleaning nozzle 5 is via valve 10.1.
By opening and closing 1, one of them is performed at the same time or only as necessary, and the supply amount is adjusted. A liquid level gauge 120 attached to the tank 3 detects a decrease and operates a liquid supply pump to maintain a constant liquid level so as to always maintain an appropriate liquid level.

Next, as mentioned above, the mixed liquid 2 sucked up by the pump 6
A part of line 42. It passes through valve v7 and is sent to two cyclones 21. Mixed liquid 2 by cyclone 21
Fine abrasives crushed due to grinding by jetting from the jetting nozzle 4 and surface-fixed matter (cleaning dirt) removed from the treated object are separated and removed, and are dropped into a sludge tank 22 connected to the lower part. . With this system, it is possible to prevent fine dust such as abrasive material and cleaning dirt from accumulating in the tank 3. The remaining fluorocarbons after separation and removal by the cyclone 21 are recovered into the tank 3 via the line 43 and the valve 6. In addition, the tank 2
The fluorocarbon liquid mixed into the tank 2 returns to the tank 3 via a line 49 and a valve v9.

23 is a wet cyclone for collecting the abrasive material in the tank 3 to the outside. The wet cyclone 23 connects to the tank 3 via a line 44 connected at A and A' in the figure.
The abrasive material is separated from the mixed liquid 2 sent from inside the tank 3.

The separated abrasive material is stored in a recovery tank 24. Further, the remaining fluorocarbon is returned to the tank 3 via the line 45.

Note that the cleaning filth and abrasive material stored in the sludge tank 22 and recovery tank 24 contain fluorocarbons, and in this case, the line 46 of the sludge tank 22 can be removed by operating valves V5, V9, and valve V13, etc. ,
If the line 47 (connected at B and B') of the recovery tank 4 is connected to the line 31.48 on the suction side of the compressor 8, the suction of the compressor 8 will cause the sludge tank 22 to
, the fluorocarbons in the recovery tank 24 are vaporized and recovered, and then transferred to the tank 2.
2. Cleaning dirt and abrasive material remaining in the chamber will dry in a short period of time. This makes it extremely easy to dispose of the washed dirt and recovered abrasive material. Further, after the abrasive material has been recovered through the above operations, the fluorocarbons in the tank 3 can be vaporized and recovered in the liquid storage layer 6 by operating only the compressor 8 with valve v2 open and valve v1 closed. can. In this case, heating is performed by the heater 25 in order to prevent a temperature drop due to heat of vaporization and to promote vaporization.

In addition, 50 sucks up the j-containing liquid 2 in the tank 3 using the Venturi effect caused by the airflow of high-pressure freon gas instead of the pump 6 described above. This is a suction line for ejecting water from the nozzle 4. When sucking up the mixed liquid 2 using the suction line 50, the valve V8 is closed and the valve V12 is opened.

When high-pressure fluorocarbon gas is sent from the line 32 through the valve Vl, a negative pressure is created at the outlet of the injection nozzle 4, so the mixed liquid 2 in the tank 3 is sucked up to the injection nozzle 4 via the suction line 50 due to the Venturi effect. This is what is injected from the injection nozzle 4 together with the fron gas. When the mixed liquid 2 is sucked up using the Penturi effect, the cleaning and grinding effects are lowered because the suction force is weaker and the injection flow rate is lower than when the pump 6 is used to suck up the mixed liquid 2. If the amount of damage is slight, sufficient effects can be obtained. Further, compared to the case where the pump 6 is used, there is an advantage that the power consumption is lower and the device can be simplified.

In the above, since the pump 6 and the suction line 50 are installed together, by adjusting the valves V8 and V12, either suction by the pump 6 or suction by the line 50 can be selected as appropriate depending on the degree of contamination of the object to be treated. This makes cleaning and grinding more efficient and extremely convenient. Note that the pump 6 and the suction line 50 do not necessarily need to be installed together, and only one of the suction means may be provided depending on the application of the device.

The wet-type blasting apparatus 1 according to an embodiment of the present invention is constructed and operates as described above. 1.) Use efficiently with minimum loss.

In addition, with this device, it is possible to quickly process the material to be treated due to its degreasing effect, as well as to recycle the fluorocarbons without any loss and to use them again. I can do it. In addition, due to the characteristics of Mr. Lee, the material to be treated dries in a short time and there are 4 children and 7 children! It is possible to dry and recycle dirt and abrasive materials in a short time. Furthermore, since the vaporized residue of fluorocarbons is pressurized and used for injection, a separate compressed air supply device is provided, unlike the conventional wet-type plast equipment that injects a four-combination solution of water and abrasive material together with compressed air. No car required.

Further, in the above embodiment, a case was shown in which the mixed solution 2, which is a mixture of Freon, which is a low point solvent, and an abrasive material, was used as the cleaning liquid, but it is also possible to use only Freon as the cleaning liquid without mixing an abrasive agent. If the amount of dirt, oil, etc. adhering to the object to be treated is light, a sufficient cleaning effect can be obtained just by spraying Freon.

In this case, the cost required for cleaning will be reduced by the amount of the abrasive material, and the entire apparatus will be simplified because the wet cyclone 23 and recovery tank 24 for separating and recovering the used abrasive material are no longer required. Further, although an example using fluorocarbon as a low-boiling point solvent has been shown, the same effect as the above-mentioned fluorocarbon solution can be obtained by using other low-boiling point solvents such as trichlorethylene and perchlorethylene. However, Freon liquid is probably the most suitable because it is non-flammable, non-toxic, and has no purple odor.

In addition, in the above embodiment, the distiller 13 and the beak 14
．． Although the distillation system consisting of the liquid reservoir 16, refrigerator 19, etc. is built into the device, it may be provided separately if the same effect as described above can be obtained.

Effects According to the present invention, the object to be treated can be effectively cleaned, degreased, etc., and the 4
The waste separated from the condensation liquid is dried in a short time by vaporization of the low boiling point solvent, making it extremely easy to dispose of. Furthermore, the abrasive material can be collected in a dry state when not in use, which is extremely convenient.

[Brief explanation of drawings]

The figure is a basic configuration diagram of a wet-type plast apparatus according to an embodiment of the present invention. Here, 1... processing container, 2... mixed liquid, 3...
Tank, 4... Injection nozzle, 6... Pump, 8...
・Compressor, 12... liquefier, 13 distiller, 16...
Liquid reservoir, 21... cyclone, 22... sludge tank, 23... wet cyclone, 24... collection tank, 50... suction line.

Claims (4)

[Claims] (1) A processing container equipped with a tank for storing a mixed solution of a low-boiling point solvent and an abrasive material, into which the processed material can be taken in and taken out, and which can be sealed; a pump means for supplying the gas to a nozzle provided in the processing container; a compressor for sucking and pressurizing the vaporized gas of the low boiling point solvent vaporized in the processing container and injecting it together with the mixed liquid from the nozzle; a separation means for sucking a part of the mixed liquid mixed with dirt from cleaning the object to be treated and fine dust of the abrasive material accumulated in the tank, and separating the dirt from the mixed liquid; A wet blasting apparatus comprising a recovery means for taking out a mixed liquid, separating the low boiling point solvent and the abrasive material, and recovering only the abrasive material. (2) The wet blasting apparatus according to claim 1, wherein a cyclone is used as the separation means and the recovery means. (3) A processing container equipped with a tank for storing a four-component solution of a low-boiling point solvent and an abrasive material, into which the object to be processed can be taken in and taken out, and which can be sealed, and the mixed solution in the tank. a suction means using a venturi effect to supply the solvent to a nozzle provided in the processing container, and sucking and pressurizing the vaporized gas of the low boiling point solvent vaporized in the processing container, and injecting it from the nozzle together with the mixed liquid. a compressor for sucking a part of the liquid mixture mixed with dirt from cleaning the object to be treated and fine dust of the abrasive material accumulated in the tank, and separating the dirt from the liquid mixture; and a recovery means for taking out the liquid mixture in the tank, separating the low boiling point solvent and the abrasive material, and recovering only the abrasive material. (4) The wet blasting apparatus according to claim 3, wherein a cyclone is used as the separating means and the collecting means.