JPS62120978A - Cleaning device with spray of crushed ice - Google Patents

Abstract

PURPOSE:To remove detrimental objects efficiently from metal surfaces by sending only fine crushed ice bits produced in a quantity in continuous operation to a cyclone for grouping by particle size through the use of a jet pump one by one, and by sending only those ice bits which have sizes suitable for cleaning further to a spray gun. CONSTITUTION:Fine crushed ice bits scooped from a tank (a) together with liquid nitrogen by an impeller 16 of a fine ice bits takeout/transfer device (b) set rid of the liquid nitrogen, which goes out through fine holes 14 in the impeller 15, and thus solely the fine ice bits are dropped on a chute 20. Because sent to a jet part 3 in a jet pump (c) directly, the fine ice bits are fed to a cyclone (d) for grouping by particle sizes, (d), quickly by a compressed nitrogen gas at a temp. below -20 deg.C. Then only those bits having sizes suitable for cleaning are sent to a spray gun (e) and blasted with compressed nitrogen at a temp. below -20 deg.C toward a work to be processed, W, to whose surface such detrimental objects are attached as As, P, or radioactive contaminated substances, which are thus removed off.

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Industrial Application Field) Various inspections, equipment, medical machines that use radioactivity, or nuclear power equipment including power generation equipment that uses nuclear power contain radioactivity. In addition, harmful substances such as arsenic and phosphorus adhere to semiconductor device manufacturing equipment that projects arsenic, phosphorus, etc. as ions, and research is being conducted on bacteria that can become various pathogens. Toxic bacteria are strongly attached to equipment such as bacterial culture facilities used to carry out microorganisms, so in order to maintain the performance of the above-mentioned equipment, machinery, and devices, the above-mentioned adhesion must be removed periodically.

This invention removes the above-mentioned adhering matter by removing ice particles from the surface of devices and equipment parts to which radioactive contaminants, harmful substances such as arsenic and phosphorus, or toxic bacteria are adhering. This invention relates to a cleaning device that sprays ice particles.

(Prior Art) In order to remove the above-mentioned deposits from the above-mentioned parts, conventionally, a chemical cleaning method mainly consisting of acid cleaning has been used, followed by a cleaning method in which grinding powder is sprayed. In view of the recent use of the Ice Plast method, in which ice particles are sprayed on steel plates and the like to remove rust and prepare the base for painting, the use of the Ice Plast method is also being considered.

(Problems to be Solved by the Invention) However, the above-mentioned chemical cleaning method requires multiple stages of cleaning steps and is complicated, and if the adhering material to be removed is a harmful substance or a single poisonous substance, If post-treatment is not carried out sufficiently, there is a risk of pollution problems, and the 17-Jung method, which involves injecting grinding powder, has problems in processing the generated dust and large amounts of waste grinding particles. If it contains the above-mentioned 1 harmful substance and 1 poisonous substance trade, it is necessary to carry out post-treatment with sufficient consideration for pollution surface roughness, and the iceplast method is a method of continuously transporting and supplying ice particles to each prize. There are still problems, especially when plasticizing ice particles, when the surface of the ice particles melts and turns into water.
If the temperature inside the ice grain is low, the water will recool and freeze again, causing the ice grains to clump together and form an ice block, which is not suitable for injection. If it is kept in a granular state at a low temperature, the machines and equipment will freeze and will not function as expected. An object of the present invention is to provide a cleaning device that sprays ice particles, which can solve the above-mentioned problems and drawbacks.

[Structure of the invention]

(Means for Solving the Problem) A cleaning device capable of spraying ice particles according to the first invention sprays fine ice particles on the surface of liquefied nitrogen in a cold room A maintained at 1/j°C or below. A tank a for producing imitation ice particles that is made to float, and an ice particle removal and transfer device that takes out the floating ice particles in the tank a and supplies them to a certain area, and the ice particles are removed from the ice particle removal and transfer device. is received by the jet part 3 of the jet pump C which uses nitrogen sludge at -20°C or lower as the working gas, and sends #fine ice particles to the cyclone d for particle size selection.
is provided together with the cyclone d, and -20
The ice pellets for injection separated by the cyclone d are supplied to the injection can e which uses compressed nitrogen gas at a temperature of ℃ or less as the working gas, and the ice particles according to the second invention are injected. The cleaning device includes a tank a for producing fine ice grains that floats fine ice grains on the surface of liquefied nitrogen in a low temperature chamber A maintained at -1 sr or less, and a tank a for producing fine ice grains that takes out the floating fine ice grains in the tank a. When the ice grains are taken out and transferred to a certain point, the ice grains are transferred from the ice grains taken out and transferred to a jet part 3 of a jet pump C whose operating gas is a substance gas of -20°C or less. A jet pump C is provided together with the cyclone d to send the fine ice particles to the particle size sorting cyclone d, and at least -/3
The ice grains for injection separated by the cyclone d are supplied to the injection gun e, which uses compressed nitrogen gas as a working gas, in the processing chamber B kept at a low temperature under A part of the spent ice grains is returned to the jet part 3 of the jet pump C from the lower hopper f, and the ice grain jetting device according to the third invention is as follows: -1sr: In a cold room A maintained below, there is a tank a for producing ice particles that suspends ice particles on the liquid surface of liquefied nitrogen, and a tank a for producing ice particles that is taken out from the tank a and placed in a certain place. The ice grains are received by the ice grain removal and transfer device 1b and the jet section 3 of the jet pump C, which uses nitrogen gas at -20°C or lower as a working gas, and are A jet pump C for sending the fine ice particles to the diameter sorting cyclone d is provided together with the cyclone d, and the processing chamber B
The ice grains for injection separated by the cyclone d are supplied to the injection gun e which uses compressed nitrogen scum of -20'C or less as a working gas, and the used ice particles accumulated in the lower chamber f1 of the hopper are The grains, water, and washing residue are separated into water and solids through a cyclone t for separating water and solids. Larger solids are sent to the primary tank 1, and the washing residue and water in the solids are sent to the filter h. 12, so that the water other than the cleaning residue is input into a secondary tank j communicating with the primary tank i, and the water in the secondary tank j is then subjected to harmful substances removal. The purified water produced by the pure water producing apparatus 1 is sent to the pure water producing apparatus 1, and the pure water produced by the pure water producing apparatus 1 is sent to the above-mentioned fine ice particle producing column A.
This is what I tried to change back to.

(Example) The configuration of an example of the cleaning device that sprays ice particles according to the first invention will be described in detail based on FIG. A tank a for producing ice cubes that suspends ice cubes λ on the liquid surface of liquefied nitrogen; and in this embodiment, a tank a for producing ice cubes that scoops up floating ice cubes 2 in the tank a and supplies them to a certain location. Retrieval transfer device d! ', b (detailed configuration will be explained later), and the fine ice grains 2 are transported through the fine ice grain removal and transfer device, and the nitrogen scum with a temperature of -20C or less is r
f = Jet pump C that receives the ice particles into the jet section 3 of the jet pump C as a working gas, selects ice particles with a particle size suitable for the jet cleaning process, and sends the fine ice particles to the pump 07d for use.
Towo Mae Fee Cyno ond, L4t & h! r+ @
f'r hn"'r"s P n Ice grains separated by the above-mentioned cyclone d are supplied to the ice gas/θ which uses compressed nitrogen scum at -36°C or lower as the working gas. It is.

As shown in FIG.
The outlet Kri of the hopper f in the lower part of the above-mentioned work chamber B maintained at the following low temperature, and the shelf 2.2 on which some of the spent ice grains sprayed from the injection gun e onto the workpiece WK are collected. established,
A gutter 23 is provided in the jet part 3 of the jet pump from the shelf λ2, and the nitrogen gas filling the knee iiB is sucked by a blower 2, and the ice particles accumulated on the shelf 22 are The jet part 3 is sprayed through the gutter 23.
It was designed to be sent to.

Further, the structure of an embodiment of the cleaner device for jetting ice particles according to the third invention will be explained in detail based on FIG. 9. In room A, there is a tank a for producing fine ice particles, in which fine ice particles are suspended on the liquid surface of liquefied nitrogen.
In this embodiment, a micro ice particle removal and transfer device b (detailed configuration will be explained later) which scoops up floating micro ice particles 2 in the tank a and supplies them to a certain location, and the micro ice particle removal and transfer device Then, the fine ice particles 2 are received by the jet part 3 of the jet pump C which uses nitrogen gas at -20°C or lower as the working gas,
A jet pump C is installed together with the cyclone d to send fine ice particles to a particle size sorting cyclone d that sorts ice particles with a particle size suitable for jet cleaning processing, and a jet pump C is installed together with the cyclone d.
The ice particles separated by the cyclone d are supplied to the injection can e which uses compressed nitrogen gas at -20°C or lower as the dynamic gas at t'1, and the lower part of the homb f at the lower part of the processing chamber B is provided. Remaining used ice particles accumulated in chamber f, melted water, washing #
Leftover food, etc. is sent to water and solid matter separation cyclone 2 by pump P, where it is separated into water and solids. Large solids are sent to the second stage, and cleaning residue and water in the solids are sent to filter h. The water other than the cleaning residue is sent to the upper tank 1.
The water in the secondary tank j is then fed to a harmful substance removal device k by a pump P2.
The deionized water that has been purified by 1'μ in the deionized water manufacturing device 1 is blown into the fine ice grain manufacturing tank a together with compressed nitrogen by the pump P3.

An example of the ice particle removal and transfer device used in the first to third embodiments of the invention will be described in detail with reference to FIG. tank a
Prop on the base ≠! erect the corresponding pillar! A mallet 6 is swingably supported by a shaft 7, and one end of the mallet 6 is provided with a rotary shaft that protrudes exactly in the diametrical direction of the tank a and can be rotated by a motor, A plurality of arms 10 (in the case of the one shown in FIG. 3) are fixed radially to the end of the rotation axis, and at the end of the arm 10, as shown in the enlarged plan view of FIG. , the closer you get to the axis, the more rising walls l
/ becomes high and the discharge port /2 that protrudes a little on the - side is set to 1,
The bottom plate 13 has numerous pores/≠ scooping blades/! 1
An impeller l B is provided, and the impeller /2 is connected to the tank a.
The other end of the mallet (l)
2 is the pillar mentioned above! The motor installed in / 7 is the speed reducer /
7 blades &/or
While j is deeply entering the liquid in tank a from one diametrical end of tank a and then exiting the liquid from the other diametrical end, actuating the ram 6 with cam /9; The feather/j
As the blade attempts to enter the deepest part of the liquid, the rotating shaft is raised upwards, and while the blade /j rotates once and rotates to the diametrical end of the The rotating shaft is lowered to its original position, and the blade lj does not go deep into the liquid in tank a, but rather scoops shallowly near the liquid surface to remove as many fine ice particles floating on the liquid surface. It is made so that it can be scooped out.

Then, when the blade /j scoops up the fine ice grains and rotates upward, the fine ice grains are released from the discharge port /2 (II
(7) and falls into the chute 20 from the discharge port /2.

If the impeller/B of this ice particle extraction and transfer device continues to rotate, a large amount of ice particles can be continuously dropped onto the 7 units 20, so in order to do so, the ice particle production tank a is The type that produces many small ice particles on the liquid surface is best.

For this reason, in this embodiment, a tank a for producing fine ice particles was used, which is capable of suspending fine ice particles on the surface of the liquefied nitrogen by injecting a mixture of water and nitrogen gas into the liquefied nitrogen. To place the liquefied nitrogen surface at the upper opening of tank a,
The place where the tank a is installed needs to be a low temperature room A at -15°C or lower. Note that the processing chamber B is maintained at -71°C or lower by nitrogen scum at -20°C or lower that is injected from the injection gun e.

In addition, some of the pure water is supplied to hopper f to facilitate the transfer of unmelted spent ice grains to the cyclone, which is not suitable for the ice grains separated from cyclone d for injection. The ice particles of the same size are returned to tank a via pipe 2/, and the filter h and the harmful substance removal layer in the harmful substance removal device are removed so that the remaining amount of cleaning and harmful substances can be disposed of. It has become. Note that the reference numeral m in FIG. 1 indicates a communicating pipe.

(Function) Since the embodiment of the cleaning device that sprays ice particles according to the first to third inventions (see FIGS. 1 and 2) has the above-mentioned configuration, fine ice particles can be Fine ice particles scooped up with liquid nitrogen from tank a by impeller/2 of the take-out and transfer device are impeller/! When the liquid nitrogen is removed from the pores/≠ of sent to e, -2
Compressed nitrogen at a temperature of 0° C. or lower is injected onto the workpiece W whose surface is resistant to pollutants such as arsenic, phosphorus, and radioactive contaminants, thereby removing the harmful substances.

Further, in the embodiment of the cleaning device that sprays ice particles according to the second invention (see Fig. 1), a shelf 22 is provided at the outlet of the ice popper f to catch some of the used ice particles. Processing room B
A blower is used to collect the low-temperature nitrogen gas that is filled with the ice, blows out the spent ice particles on the shelf 22, and sends it through the gutter 23 to the jet section 3 of the jet pump C, which is then sent to the cyclone d. Therefore, among the used ice particles, ice particles that are still suitable for injection can be reused. Furthermore, in the embodiment of the cleaning device that sprays ice particles according to the third invention (see FIG. 2), when the ice particles are sprayed onto the workpiece W, the used ice particles and one harmful substance are cleaned. Residue and some melted water accumulate in hopper f. During this period, the temperature in cold room A was kept below -/lc, and the temperature in room B41 was 12.
Since the compressed nitrogen is used at a temperature below 0°C, the ice grains do not melt much, but the ice particles that accumulate in the hopper f are gradually removed and sent to the cyclone 1 for separating water and solids by the pump P, where relatively large solids are removed. The water falls into the primary tank 1, and the water containing relatively small cleaning residues and harmful substances is sent to the filter h.
Submerged minute cleaning residues containing title substances fall into the secondary tank j, and the water in the secondary tank j is sent to the M harmful substance removal device 9k by pump P2, where harmful substances and minute cleaning residues are removed. The water from which the solids have been removed is sent to a pure water production facility, where it is made pure water by using, for example, an ion exchange resin, and then returned to the micro ice particle production facility/rea. The parts are supplied in the honbar f. It should be noted that the fine ice particles separated by the cyclone d and having a size unsuitable for cleaning are returned to the tank a again in accordance with the implementation of the first to third inventions. The same is true for lJ.

In addition, the cleaning residue accumulated in the filter h can be removed from the filter h.
In addition, remove the harmful substance removal layer for removing chest harmful substances,
The title substances and minute cleaning residues accumulated in the M removal layer are removed and both are discarded.

In addition, the minute substances to be disposed of between τl and millet and melted ice water are also collected from the cock 2K of the lower chamber f1 of the hopper f and the cock 2O of the paper section of the primary tank 1 during the RP business suspension period. It can be discharged and disposed of.

〔Effect of the invention〕

Since this invention has the above-mentioned configuration and is used for rF,
The fine ice particles that are continuously produced in large quantities are quickly sent to the particle size sorting cyclone d by the 111st jet pump, and only the ice particles of a size suitable for cleaning are further sent to the injection gun e. Harmful substances are removed from the surface of the metal object W, during which time the ice grains are difficult to melt, and in the second invention, the used ice grains are removed from the shelf 2.2 in the warehouse.
It passes through the gutter 23 and is returned to the jet section 3 for circulation and use.

In addition, in the third invention, the used ice grains, the removed title substance, and the bathed water are sent to the filter title substance removal device through the filter, so that the removed title substance and the cleaning residue are Not only large-sized cleaning residues but also minute harmful substances are completely removed from the water containing the cleaning residues, so there is no concern about causing a pollution problem, and the cleaning residues are removed and disposed of. In addition, a large amount of used ice grains is also covered with pure water, sent to tank a for producing fine ice grains, and then recycled into ice grains again. It is possible to provide a cleaning device that sprays .

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of a gleaning device for injecting ice particles according to the first and second inventions;
The figure is a front view of an embodiment of a cleaning device that sprays ice particles according to the third invention, FIG. Showing the plan views of the AVi cold room, B is the processing room, a is the tank for producing ice particles, b is the ice particle extraction and transfer device, C is the jet pump, d is the cyclone for particle size selection, and e is the injection gun, the hopper at the bottom of the processing chamber, f, the lower chamber of the 111 hopper, 2 the cyclone for separating water and solids, h the filter,
1 is the first order finger, j is the second order finger, k is the harmful substance removing device,
1 indicates a pure water production device, and 3 indicates a jet section of a jet pump C, respectively.

Claims (3)

[Claims] (1) In a cold room A maintained at -15°C or lower, there is a tank a for producing ice particles that suspends ice particles on the liquid surface of liquefied nitrogen, and the floating ice particles in tank a are taken out. Fine ice grains are sent to a jet part 3 of a jet pump c whose operating gas is nitrogen gas at -20°C or less, from which the ice grains are sent to a certain point and are supplied to a certain location. receive,
A jet pump c for sending the fine ice particles to the particle size sorting cyclone d is provided together with the cyclone d, and the -
A cleaning device for injecting ice particles, characterized in that the ice particles for injection separated by the cyclone d are supplied to an injection gun e that uses compressed nitrogen gas of 20° C. or lower as a working gas. (2) In a cold room A kept at -15°C or lower, there is a tank a for producing ice particles that suspends ice particles on the liquid surface of liquefied nitrogen, and a tank a for producing ice particles is taken out from the tank a. Fine ice grains are received by the ice grain removal and transfer device b that is supplied to a certain location and the jet portion 3 of a jet pump c that uses nitrogen gas at -20°C or less as the operating gas. A jet pump c for sending the fine ice particles to the particle size sorting cyclone d is provided together with the cyclone d, and the temperature is at least -15°C.
The ice grains for injection separated by the cyclone d are supplied to the injection gun e, which uses compressed nitrogen gas as a working gas, in the adjacent processing chamber B, which is maintained at a low temperature below. A cleaning device for jetting ice particles, characterized in that a part of the used ice particles is returned to the jet section 3 of the jet pump c from the hopper f. (3) In a cold room A kept at -15°C or lower, there is a tank a for producing ice particles in which micro ice particles are suspended on the liquid surface of liquefied nitrogen, and the floating micro ice particles in tank a are taken out. Fine ice grains are received by the ice grain removal and transfer device b that is supplied to a certain location and the jet portion 3 of a jet pump c that uses nitrogen gas at -20°C or less as the operating gas. A jet pump c for sending the fine ice particles to the particle size sorting cyclone d is installed together with the cyclone d, and -2
The ice particles for injection separated by the cyclone d are supplied to the injection gun e which uses compressed nitrogen gas of 0°C or less as the working gas, and the spent ice particles accumulated in the lower chamber f_1 of the hopper f are melted. Water and washing residue are separated into water and solids through a cyclone g for separating water and solids, and large solids are sent to the primary tank i, and washing residues and water in the solids are sent to a filter h. , water other than the cleaning residue is put into a secondary tank j communicating with the primary tank i, and the water in the secondary tank j is then purified through a harmful substance removal device k. A cleaning device for spraying ice grains, characterized in that the pure water produced by the water purification device I is sent to the water production device I, and the pure water produced by the water production device I is returned to the ice grain production tank a.