JPH10337667A - Dry ice blasting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent scattering of dust and stagnation of carbon dioxide gas at a working site and reduce dew condensation by sucking the dust and gas together in a cover covering a blast nozzle and a working surface of a blast object and separating the sucked dust and gas from each other. SOLUTION: Carbon dioxide gas G sand carrier gas A made as dry ice particles D in a cover 2 are sublimated are sucked by a suction device 3 formed with a suction ejector, etc., to be driven by compressed air, etc., sent through L2 from a compressor 12, and dust F sucked with gas B(=A+G) and dew condensed moisture W are separated from each other by a dust separation device 4 formed with a cyclon and bag filter, etc. Clean gas C from which dust F and moisture W are separated is discharged in the atmosphere by a line L3 at a place separated form a working site or where there is no anxiety of stagnation of gas C. Additionally, steam content in the carrier gas A is reduced by mixing this gas C in the carrier gas A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry ice blasting apparatus for performing blasting by injecting dry ice particles onto an object.

[0002]

2. Description of the Related Art Conventionally, a mold is washed when a mold release agent or a polymer material adheres to a mold for molding a tire, urethane, rubber, or the like, and various types of manufacturing methods in which oil, a coating film, a processing material, etc. adhere. An organic solvent, sandblast, high-pressure water, or the like is used for washing the machine. However, when an organic solvent harmful to the human body is used, special consideration is required for its use and management, thereby lowering work efficiency and causing a problem of environmental pollution.
Further, in sand blasting, sand, resin, small iron balls, etc. used as shot materials become dirty and remain, and it takes time to clean up and dispose of dirty shot materials. Also,
When high-pressure water is used, the blast surface becomes wet, so that drying and wiping of the surface are required, and problems such as treatment for separating dust from wastewater and wastewater treatment arise.

[0003] For this reason, for example, relatively small dry ice particles (pellets) in the shape of a cylinder or rice grains of 3 to 4 mm.
By compressed air at high speed to the blast target,
Dry ice blasting, which removes dirt from the target object due to the impact force of the collision of the dry ice, thermal shock on the surface of the object due to the low-temperature dry ice, or rapid volume expansion during the sublimation of the dry ice, is performed. Have been done.

[0004] In these conventional dry ice blasting apparatuses, dry ice pellets are used without a gas recovery facility because they are sublimated into the atmosphere after spraying to form carbon dioxide gas.

[0005]

However, while dry ice pellets as shot materials are sublimated, the substances that make up the dirt on the blasting object are crushed to generate dust and dust, and dust is generated in the work place. Workers need to wear protective equipment such as dust masks and dust-proof glasses because they will fly or scatter on the floor, which reduces the efficiency of work and the need to collect scattered dust. Problem.

In addition, carbon dioxide gas generated by sublimation of dry ice tends to stay and the concentration of carbon dioxide in the work place becomes high, so that the work environment is deteriorated. In particular, when used in a closed space such as in a tunnel, it is important to clean the working environment, and it is important to provide sufficient ventilation so that workers do not inhale dust and carbon dioxide.

Further, since dry ice has a low temperature of -78 ° C., entraining the surrounding air causes condensation of the water vapor in the air and temporary dew condensation, so that the surface to be blasted is wetted. In addition, there is a problem that the noise during the blasting operation is extremely large at 100 dB or more, and the operator needs to use earplugs and soundproofing protective equipment.

In addition, since the liquefied carbon dioxide used is a by-product generated from the plant process, even if a dry ice blasting device is used, the total amount discharged into the atmosphere does not change, and the amount of liquefied carbon dioxide is not affected by global warming. The effect remains the same, but it is uneconomical to release it into the atmosphere in a single use.

On the other hand, regarding sandblasting,
In Japanese Utility Model Publication No. 54-869, a closed box is formed with transparent walls on both sides and surroundings other than the front surface, and a hopper is provided below the floor as a grid-like plate, which is connected to a collecting device.
A sand blast work table provided with a suction fan in a box body has been proposed.

When dry ice blasting is applied to the sand blasting work table as it is, the suction fan is provided separately from the hopper and the collecting device. In addition, since the gas is sublimated and gasified in the recovery device, the hopper is filled with carbon dioxide gas, causing a backflow and a blow-up, which makes it difficult to collect dust.

[0011] Further, there is a problem that dust is easily generated at the same time as dust flows to the suction fan side, so that a suction filter or the like is clogged and its suction function is easily stopped. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has an object to prevent scattering of dust and stagnation of carbon dioxide gas in a work place, and to achieve low noise and low noise dryness. It is to provide an ice blasting device.

[0012]

The dry ice blasting apparatus according to the present invention is configured as follows. A cover for covering the work surface of the blast nozzle and the blast object, a suction device for sucking together dust and gas in the cover, and a sucked trash A dust separation device for separating the dust from the gas is provided. The dust in the working portion is sucked together with the gas, and the dust can be removed by the dust separation device.

[0013] Therefore, dust can be prevented from being scattered and collected easily, and the work place can always be kept in a crane state. Also,
Since the generated carbon dioxide gas G can be released into the atmosphere at a place away from the work place, the carbon dioxide gas G can be prevented from staying and the work can be performed safely. In addition, the noise can be reduced because the cover can block and absorb noise during blast work, and furthermore, it can block the outside air containing water vapor components and prevent it from touching the work surface, reducing the amount of condensation on the work surface it can.

[0014] At least a part of the cover is formed to be transparent, and the work surface can be monitored at the time of work, so that work can be performed reliably and work efficiency can be improved. A cleaning means is provided for the transparent portion, and it is possible to remove fogging due to a temperature difference between the inside and outside of the cover, so that the work surface can be reliably monitored.

The suction device is formed by a suction ejector, and gas and dust in the cover can be easily sucked by an existing driving source such as compressed air or carbon dioxide gas. The dry ice particles are mixed with the gas fluid, and the gas is ejected from the blast nozzle, and at least a part of the gas sucked by the suction device is configured to be mixed with the gas fluid, and dust is removed. Since the low-temperature gas can be reused as a part of the carrier gas for the dry ice particles, the gas temperature of the carrier gas can be reduced, and the amount of sublimation during the transport of the dry ice particles can be reduced. In addition, since the amount of air in the carrier gas can be reduced, the amount of water vapor in the carrier gas can be reduced, and dew condensation on the work surface can be further prevented.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a dry ice blasting apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram showing a flow of a system of a dry ice blasting apparatus according to the present invention. Dry ice D or liquefied carbon dioxide gas L is produced in a production plant 10 and put in a dedicated cold storage container 11 to be driven by a truck or the like. Delivered to the place of use. When the liquefied carbon dioxide L is delivered and stored in the form of liquefied carbon dioxide L, the liquefied carbon dioxide L itself is ejected from the nozzle by the pelletizer 14 and the liquefied carbon dioxide L itself is cooled by the latent heat of vaporization to form pellet-shaped dry ice particles D in an adiabatic state. To

The dry ice blasting apparatus includes a blast nozzle 1 for injecting the dry ice particles (pellets) D onto the blast target 30, and covers the work surface 31 of the blast nozzle 1 and the blast target 30. A cover 2, a suction device 3 for suctioning dust F and gas B in the cover 2, and a dust separation device 4 for separating the sucked dust F and gas B are provided.

The dry ice particles D are supplied from a dedicated cooling container 11 to a hopper 5 of a dry ice blasting device by a charging device (not shown). The blast nozzle 1 is provided on the line L1. The feeder 6 is composed of a rotary feeder or the like, and a line L through which the carrier gas A flows at a high speed.
1 is supplied with dry ice particles D.

The carrier gas A is a carrier gas such as dry high-pressure air supplied from the air compressor 12 or a factory air source through the dryer 13 or high-pressure air supplied from a high-pressure cylinder or the like. By the carrier gas A, the dry ice particles D are transported and supplied in a line L1 formed by a hose or the like, and are sprayed from the blast nozzle 1 toward the blast target 30.

In this jetting, the dry ice particles D are usually supplied into the high-speed carrier gas flow A as described above, and are jetted and collided with the work surface 31 by the carrier gas A flow. It is not necessary to use the gas A, and the collision may be performed by a method of passing between rotating wheels of a pitching machine or the like and accelerating, or a method of mechanically throwing by a rotating arm or the like. In addition, various types of nozzles having various directions and spreads are prepared for the blast nozzle 1, and for example, for a pipe material such as a coating hanger, the blast nozzle 1 is arranged so as to embrace the pipe material. By
The blast time can be shortened.

When the dry ice particles D ejected from the blast nozzle 1 collide with the work surface 31, the deposits E are removed by the impact force of the collision of the dry ice particles D. In addition, the ejection of the dry ice particles D at −78 ° C. causes a temperature difference between the base material or the base material of the object 30 and the attached matter E, thereby facilitating the detachment of the attached matter E such as dirt or a coating film. .

Then, as shown in FIG.
A cover 2 is provided so as to cover the blast nozzle 1 and the blast nozzle 1.
This cover 2 has a work surface 31 that can be completely covered.
A skirt 24 made of flexible rubber, plastic, or the like is provided on the distal end side of the cover main body 23 to maintain airtightness and prevent noise leakage at the time of collision. The cover body 23 and the skirt 24 are preferably made of a material having a soundproof effect, and are formed so as to shield and absorb the collision sound at the time of blasting.

That is, the role of the cover 2 is to prevent dust F and dry ice particles D formed by the detachment of the attached matter E from scattering, reduce noise, and shut off the outside air. In addition, a transparent portion 25 is provided on at least a part of the cover body 23 so that the user can work while monitoring the blast condition visually or by using a television or the like. Since the transparent portion 25 easily forms dew due to a temperature difference between the inside and the outside, a cleaning means 26 such as a wiper or a compressed air blow is provided to remove cloudiness due to the dew condensation on the transparent portion 25.

Then, the suction device 3 formed by a suction ejector or the like driven by compressed air a sent from the compressor 12 via the line L2 and the like forms carbonic acid formed by sublimation of the dry ice particles D in the cover 2 Gas G or carrier gas A
Is sucked, and the dust F and the condensed moisture W sucked together with the gas B (= A + G) are separated by the dust separation device 4 formed by a cyclone, a bag filter, or the like.

The clean gas C from which the dust F and the water W have been separated is separated from the work place by the line L3.
Further, the gas C is released into the atmosphere in a place where there is no fear of stagnation. Alternatively, the temperature of the gas C containing the carbon dioxide gas G is lowered due to the sublimation of the dry ice particles D, and the condensed water W is separated by the trash separation device 4 and the water vapor content is reduced. L4 enters the inlet side of the air compressor 12 or lines L5, L5 '
Gas A in line L1 with feeder 6 via
When mixed in the carrier gas, the temperature of the carrier gas G is lowered, and the water vapor content in the carrier gas A is reduced.

According to the above dry ice blasting apparatus, the blast nozzle 1 and the work surface 3 of the blast target 30
1 is provided, and furthermore, the suction device 3 for sucking the gas B mixed with the dust F in the cover 2 and the dust separation device 4 are provided, so that the scattering of the dust F can be prevented and the work space 22 can be prevented. The dust B can be removed by the dust separation device 4 by sucking the gas B. Therefore, the working place can always be kept in a crane state, and the generated carbon dioxide gas G can be released into the atmosphere at a place away from the working place.
Can be prevented, and work can be done safely.

Further, the noise at the time of the blasting operation can be cut off and absorbed by the cover 2, so that the noise can be reduced. Further, the outside air containing the water vapor component can be cut off, and the work surface 31 can be prevented from touching. Can reduce the amount of condensation. Further, the low-temperature gas B from which the dust F has been removed is put into the line L1 and reused as a part of the carrier gas A, thereby lowering the gas temperature of the carrier gas A and causing the dry ice particles D to be transported during the transportation. Since the amount of sublimation can be reduced, the dry ice particles D can be efficiently transported and jetted. In addition, since the amount of air in the carrier gas A can be reduced, the amount of water vapor in the carrier gas A can be reduced, and dew condensation on the work surface 31 can be further prevented.

By forming at least a portion 25 of the cover 2 transparent, the work surface 31 can be monitored at the time of work, so that work can be reliably performed and work efficiency can be improved. Further, since the transparent portion 25 is provided with the wiper 26, the fogging due to the temperature difference between the inside and outside of the cover 2 can be removed by the cleaning means 26, so that the work surface can be reliably monitored.

Further, by forming the suction device 3 by a suction ejector, the gas B and the dust F in the cover 2 can be sucked by an existing drive source such as compressed air or carbon dioxide gas. Therefore, a new driving source such as an inducing blower or a driving power source for driving the inducing blower becomes unnecessary.

A blast nozzle 1 with a cover 2
By equipping the part as an end effector of the robot's manipulation arm and by equipping it with the blast nozzle position holding function, blasting work by the robot becomes possible. These devices, the air compressor 12, the suction device 3, the manipulation By mounting an arm, a generator, and the like on a vehicle, it is possible to perform a blasting operation such as cleaning of a hull surface while maintaining a clean environment even in an open space operation for a large object such as a ship.

Accordingly, the dry ice blasting apparatus of the present invention can be used not only for removing adhering substances and a release agent from a molding die and removing cutting oil for machine products in a room such as a factory, but also for cleaning a lamp in a tunnel, a tunnel wall surface. In a closed space such as a clean room or cleaning of sound insulation side walls, etc., where there is a need to prevent the accumulation of carbon dioxide gas, or in an open space such as cleaning bracket type lighting, guard rail cleaning, spherical gas holder paint peeling, cleaning around railway vehicle feet, etc. It can also be used in places where it is necessary to prevent the separated dust from scattering or to reduce noise.

[0032]

As is apparent from the above description, according to the dry ice blasting apparatus of the present invention, the blast nozzle and the cover for covering the work surface of the blasting object are provided, and the dust and gas in the cover are removed together. By providing a suction device and a dust separation device for sucking dust, it is possible to prevent dust scattering and collect dust easily, and to remove the dust by sucking the gas from the work area to a place away from the work place. The blast work can be performed safely in a clean working environment.

Further, since noise can be cut off or absorbed by the cover, noise can be reduced. Furthermore, since the outside air containing the water vapor component can be shut off, the amount of dew condensation on the work surface can be reduced. Also,
Since at least a part of the cover is formed transparent and the transparent part is provided with the cleaning means, it is possible to reliably monitor the work surface.

Further, by mixing the dry ice particles with the gas fluid and injecting the same from the blast nozzle, at least a part of the gas sucked by the suction device is mixed into the gas fluid, whereby the dry gas is mixed. Since the temperature of the gas fluid for transporting the ice particles can be reduced by the mixed low-temperature gas, the amount of dry ice particles that sublime before the collision can be reduced, and blasting can be performed efficiently. In addition, since the amount of air in the gas fluid can be reduced and the amount of water vapor contained in the air and mixed into the gas fluid for transportation can be reduced, dew condensation on the work surface can be further prevented.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a flow of a system of a dry ice blasting device according to the present invention.

FIG. 2 is a perspective view showing a dry ice blasting device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Blast nozzle 2 ... Cover 3 ... Suction device 4 ... Dust separation device 5 ... Hopper 6 ... Feeder 10 ... Manufacturing plant 11 ... Exclusive cold storage container 12 ... Air compressor 13 ... Dryer 14 ... Pelletizer 22 ... Work space 23 ... Cover body 24 ... Skirt 25 ... Transparent part 26 ... Wiper 27 ... Duct 30 ... Blast target 31 ... Work surface A ... Carrier gas B ... Gas C ... Clean gas D ... Dry ice particles,
Dry ice E ... attached matter F ... dust G ... carbon dioxide gas L ... liquefied carbon dioxide gas W ... moisture

Claims (5)

[Claims] 1. A blast nozzle for injecting dry ice particles onto a blast target, a cover for covering a work surface of the blast nozzle and a blast target, and a suction device for sucking dust and gas in the cover together And a dust separation device for separating the sucked dust and gas from each other. 2. The dry ice blasting device according to claim 1, wherein at least a part of the cover is formed transparent. 3. The dry ice blasting device according to claim 2, wherein a cleaning unit is provided for the transparent portion. 4. The dry ice blasting device according to claim 1, wherein said suction device is formed by a suction ejector. 5. The method according to claim 1, wherein the dry ice particles are mixed with a gas fluid, and the gas is injected from the blast nozzle, and at least a part of the gas sucked by the suction device is mixed into the gas fluid. The dry ice blasting device according to any one of the above.