JP2002079465A - Dry ice blast device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a well usable dry ice blast device that is reducible in overall device size, weight and cost and can execute proper blasting using dry ice particles. SOLUTION: The dry ice blast device comprises an air compressor 2, an air feed passage 3 for leading an airflow generated by the air compressor 2 to a nozzle 32, and a dry ice particle supply means 5, 6 for entraining dry ice particles D in the airflow. The air compressor 2 used is of a low-pressure type with an outlet-pressure of 1.2 to 2.5 atm. The dry ice particle supply means 5, 6 is arranged to entrain the dry ice particles D in the airflow upstream of the nozzle 32 in the air feed passage 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry ice blast apparatus using dry ice particles as an abrasive.

[0002]

2. Description of the Related Art An example of a schematic structure of a conventional dry ice blasting apparatus is shown in FIG. This conventional type has an air dryer 91, a discharge port of a medium / high pressure type air compressor 90 for compressing air to 8 atm (atm) or more, for example.
It has a configuration in which a pipe 92 and a nozzle 93 are connected. In a pipe 92a branched from the pipe 92, a hopper 9 is provided.
The dry ice particles D stored in 4 can be supplied by the supply device 95. The dry ice particles D supplied into the pipe 92a are mixed with the air flow in the nozzle 93.

[0003] According to such a configuration, a high-speed air flow in which dry ice particles D are mixed is discharged from the nozzle 93, and blasting using the dry ice particles D as a polishing material can be performed. . When the dry ice particles D collide with the object to be blasted, they sublime in a short time thereafter. Therefore, there is no need to collect the abrasive.

[0004]

However, the above-mentioned prior art has the following problems.

First, the injection noise of the high-speed air flow from the nozzle 93 is large, and its sound pressure level is, for example, 120 dB.
It may reach up to. This is believed to be jet noise when the air expands rapidly due to large pressure changes. Conventionally, for example, when an operator
When the blasting operation is performed by hand, a loud noise is generated in the vicinity of the worker, making it difficult to endure continuous operation.

Secondly, when a high-speed air flow is injected from the nozzle 93, violent turbulence occurs in the nozzle 93 because air of 8 atm or more rapidly expands to normal pressure. For this reason, the rate at which the dry ice particles D are crushed in the nozzle 93 increases, and a lot of waste occurs.

[0007] Third, the dry ice particles D
When it is transported inside a, it collides violently with the inner wall of the pipe 92a. Therefore, this also causes waste such that the dry ice particles D are crushed or the wear amount of the dry ice particles D increases.

[0010] Fourth, since the air compressor 90 is of a medium / high pressure type, the air compressor 90 itself is expensive, and the equipment associated with it is also expensive. In addition, their size and weight are large, which makes transporting inconvenient. In the above conventional technology, the reason that the medium / high pressure type air compressor is used is based on the idea that the higher the air flow generated by the air compressor, the higher the blasting efficiency can be. Probably because it was dominant. However, it will be understood from the following description of the present invention that such a concept is not necessarily appropriate.

Fifth, the dry ice particles D
, The dry ice particles D are immediately injected from the nozzle 93 together with the high-speed air flow. For this reason, it was difficult to determine the direction in which the dry ice particles D were sprayed. In the above-mentioned prior art, since the pressure fluctuation when the high-speed air flow is injected into the atmosphere from the nozzle 93 is large, this air flow is likely to spread at a large angle, and the dry ice particles also greatly spread. The tendency was stronger. Therefore, it is not suitable for blasting a desired portion intensively.

Sixth, since the pipe 92 and the branch pipe 92a are connected to the nozzle 93, when the operator holds the nozzle 93 by hand, the operator pulls the two pipes around. Becomes Therefore, its handling has been troublesome.

It is an object of the present invention to provide a dry ice blasting apparatus which can solve or reduce the above-mentioned problems.

[0012]

DISCLOSURE OF THE INVENTION A dry ice blasting device provided by the present invention includes an air compressor, an air conveying path for guiding an air flow generated by the air compressor to a nozzle, and mixing dry ice particles into the air flow. And a dry ice blasting device for supplying air to the air compressor.
A low-pressure air compressor having a pressure of 0.2 to 1.5 atm (a gauge pressure of 0.2 to 1.5 atm) is used, and the dry ice particle supply means is provided at a higher position than the nozzle of the air conveyance path. It is characterized in that it is provided so as to mix dry ice particles into the air flow upstream.

[0013] In a preferred embodiment of the present invention, the dry ice particle supply means includes a hopper having a bottom opening for storing dry ice particles, and discharging the dry ice particles from the bottom opening of the hopper. Sending means for sending to the air conveying path.

[0014] In another preferred embodiment of the present invention, the whole or a part of the inner surface of the hopper has an uneven surface capable of making point contact with dry ice particles.

[0015] In another preferred embodiment of the present invention, the uneven surface is a resin-coated surface.

In another preferred embodiment of the present invention, a knocker is provided which strikes the hopper at a predetermined time interval so as to give an impact to the dry ice particles contained in the hopper.

In another preferred embodiment of the present invention, the sending means receives the dry ice particles from the hopper while always shutting off a gap between a bottom opening of the hopper and the air discharge passage. And a moving member that operates to supply the air into the air discharge path.

In another preferred embodiment of the present invention, the delivery means includes a casing having a bottom opening of the hopper and first and second openings respectively communicating with the air conveying path; A rotor rotatably provided therein, and a housing portion provided in the rotor, and the housing portion is provided in each of the first and second openings of the casing with the rotation of the rotor. By moving to a position communicating with the hopper, it is possible to drop and discharge dry ice particles from the bottom opening of the hopper into the storage part and drop and discharge dry ice particles from the storage part to the air conveyance path. A rotary feeder, and the rotary feeder is configured such that the rotor always shuts off between the first and second openings.

In another preferred embodiment of the present invention, a plurality of the accommodating portions are provided on the rotor, and the width of a partition wall for partitioning the plurality of accommodating portions is equal to the first accommodating portion. And the width of each of the second openings is smaller than each opening width.

[0020] In another preferred embodiment of the present invention, the accommodating portion is formed as a through hole penetrating in the thickness direction of the rotor, and the rotor is
Between the upper wall and the lower wall, through which the first and second openings of the casing are formed, respectively, are rotatable around an axis extending in the vertical thickness direction of the casing; and Each of the upper surface portion and the lower surface portion of the rotor is provided with an auxiliary piece serving as an opening edge of the housing portion, and the auxiliary piece is provided between the auxiliary piece and the rotor. An elastic member that presses toward the upper wall or the lower wall is provided.

[0021] In another preferred embodiment of the present invention, the rotation speed of the rotor is changeable.

[0022] In another preferred embodiment of the present invention, in the air transport path, upstream of a location where dry ice particles are supplied from the dry ice particle supply means, toward the air compressor. A check valve for preventing the backflow of air is provided.

In another preferred embodiment of the present invention, a portion near the front end of the air conveyance path is constituted by a flexible hose, and the hose includes an operation switch and an operation switch. A wireless transmitter capable of outputting data of the operation content of the switch as a wireless signal, and operating the air compressor and the dry ice particle supply unit based on the wireless signal output from the wireless transmitter. It is configured to be controllable.

In another preferred embodiment of the present invention, the air compressor, a motor for driving the air compressor, a dry frame, a portable frame having wheels for movement, The particle supply means and a pipe member forming the air transport path are assembled to the portable frame.

Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 shows an embodiment of a dry ice blasting apparatus according to the present invention. The dry ice blasting apparatus A of the present embodiment includes a portable frame 1, an air compressor 2, a pipe 30 connected to a discharge pipe 20 of the air compressor 2, a hose 31, a nozzle 32, an operation unit 4A, a control unit. 4B, a hopper 5, a rotary feeder 6, and a knocker 7.

The portable frame 1 is formed in a substantially box shape as a whole, and other components constituting the dry ice blasting apparatus A are directly or indirectly assembled to the portable frame 1. I have. The portable frame 1 has a plurality of wheels 10 and can easily move on the ground. One or more handles 11 are attached to the upper part of the portable frame 1.

The air compressor 2 is, for example, a roots blower, and its outlet pressure in the discharge pipe 20 is 1.2 to 1.2.
The pressure is set to 2.5 atm (atm), preferably 1.4 to 1.9 atm, and can generate a low-pressure, high-speed, large-flow airflow. The air compressor 2 is driven by the motor M1 and the belt 21.
Operation is possible by applying a driving force through a pair of pulleys 22a and 22b.

The inside of the tube 30 and the hose 31 constitutes an air conveying path 3 for guiding the air flow generated by the air compressor 2 to the nozzle 32. A branch 30 for connecting the inside of the tube 30 to the rotary feeder 6 is connected to the tube 30, and the dry ice particles D enter the tube 30 through the branch 32. It is configured to be supplied. A check valve 33 is provided between the pipe 30 and the discharge pipe 20 of the air compressor 2. As shown in FIG. 5, the check valve 33 includes a valve body 33a that can swing opposite to the opening 20a of the discharge pipe 20. When the compressed air is discharged from the air compressor 2 toward the pipe 30, the valve body 33 a opens the opening 20 a as shown by the solid line in FIG. When the rotor is erroneously reversely rotated, the opening 20a as shown by the imaginary line in FIG.
Is to be closed. The check valve 33 serves to prevent the dry ice particles D from being sucked into the air compressor 2. Although not shown in the drawings, the dry ice blasting device A may have a configuration in which an accumulator is provided upstream of the connection point of the branch pipe portion 30 of the air conveyance path 3. According to such a configuration, it is possible to suppress the generation of noise due to the discharge of the compressed air and to suppress the pulsation of the air flow in the air conveyance path 3.

In FIG. 1, the hose 31 has flexibility and can be attached to and detached from the distal end of the tube 30. The nozzle 32 is attached to the distal end of the hose 31, and has a handle 32a so that the user can easily hold it. The nozzle 32 has, for example, a circular opening at the tip end, but is detachably attached to the hose 31 so that the nozzle 32 can be appropriately replaced with one having a different opening shape (for example, a flat shape) depending on the working application. It can also be. The nozzle 32 has an elongated straight tubular tip portion having a length of, for example, about 30 to 60 cm. According to such a configuration, when the airflow mixed with the dry ice particles D is jetted from the nozzle 32, the jet direction can be stabilized. In addition, the worker does not need to be very close to the blast processing target portion. If the total length of the nozzle 32 is increased, the weight increases, but in the present embodiment, the air flow passing through the nozzle 32 is set to a low pressure, so that the nozzle 32
Since the thickness of the nozzle 32 can be reduced, an increase in the weight of the nozzle 32 can be suppressed, and the nozzle 32 can be easily operated.

The operation unit 4A is provided with an operation switch for turning on and off the operation of the dry ice blasting apparatus A, and is attached to the outer surface of the nozzle 32 so that the operation is easy. The operation unit 4A may be provided with an operation switch for adjusting the supply amount (supply speed) of the dry ice particles D from the rotary feeder 6 to the air conveying path 3. The operation unit 4A incorporates a wireless transmitter 40 capable of wirelessly outputting data of the content of the operation as a radio wave of a predetermined frequency or an infrared signal. The wireless signal output from the wireless transmitter 40 can be received by a wireless receiver 41 provided in the control unit 4B. The control section 4B is provided in the portable frame 1 and includes an electric circuit (not shown) for controlling each section of the dry ice blasting apparatus A based on the content of the signal received by the wireless receiver 41. ing.
The control unit 4B is also provided with operation switches. The ON / OFF operation of the operation of the dry ice blasting apparatus A and other control can be performed by operating both the operation switches and the operation unit 4A. Can be done. In the present invention, the wireless transmitter 40 described above is used.
Instead of the unit using the wireless receiver 41, a unit that electrically connects the operation unit 4A of the nozzle 32 and the control unit 4B via a harness may be used. The above harness is
What is necessary is just to route along the hose 31.

The hopper 5 is for storing the dry ice particles D, and is fixedly attached to the upper part of the portable frame 1. The hopper 5 is formed in a funnel shape having at least a lower half portion having a bottom opening 53,
The upper opening serving as an inlet for the dry ice particles D is a lid 5.
0 can be closed. The hopper 5 is formed, for example, by processing a stainless steel plate, and has a resin coating applied to the entire inner surface thereof. More specifically, as best seen in FIG.
A resin coating layer 52 made of, for example, a fluororesin is formed on the surface of a base material 51 made of a stainless steel plate. The surface of the resin coating layer 52 is an uneven surface in which a large number of minute uneven portions are formed in a smooth shape. As a means for forming the resin coating layer 52, for example, before forming the resin coating layer 52, the particle diameter of the resin coating layer 52 on the surface of the base material 51 is 0.1 to 0.1.
By performing a blast process using a hard abrasive material of about 5 mm, the surface of the base material 51 is roughened, and thereafter, a means of coating the rough surface with a fluororesin having a thickness of about 5 to 10 μm is used. it can. Preferably, the outer periphery of the hopper 5 is surrounded by a heat insulating material (not shown), and is configured so that the sublimation of the dry ice particles D in the hopper 5 is suppressed.

The knocker 7 is for knocking the dry ice particles D in the hopper 5 by hitting the vicinity of the bottom of the hopper 5.
a through a suitable bracket 71. The knocker 7 has a member 70 for making contact with the hopper 5 reciprocally movable by, for example, an electromagnetic solenoid. The operation of hitting the hopper 5 is intermittently performed at predetermined time intervals under the control of the control unit 4B. Is configured to be performed. The time interval can be increased or decreased by operating an operation switch of the control unit 4B.

The rotary feeder 6 transports the dry ice particles D in the hopper 5 through the branch pipe 32 to the air transport path 3.
To supply a fixed amount to the container. As shown in FIG. 3, the rotary feeder 6 has a configuration in which a rotor 61 is rotatably provided in a casing 60. The casing 60 is fixed to the chassis 19b, 19c of the portable frame 1, and includes a spacer 60c.
And an upper wall portion 60a and a lower wall portion 60b opposed to each other. The upper wall portion 60a is connected to the bottom portion of the hopper 5 via a tube 63, and the bottom opening portion 5
3 and a first opening 62 a communicating with the tube 3 via a tube 63. The lower wall part 60b is connected to the upper part of the branch pipe part 32, and has a second opening 62b that communicates with the air conveying path 3 via the branch pipe part 32. The first and second openings 62a and 62b are displaced so as not to face each other.

The rotor 61 is formed in a substantially disk shape and has a shaft 64 penetrating vertically through a substantially central portion of the casing 60.
Can be rotated with the rotation of. The shaft 64 has a gear 64
a or a pulley is attached to the gear 64a.
Alternatively, the shaft 64 and the rotor 61 are rotatable by the pulley receiving a driving force from a motor (not shown). The rotation speed of the rotor 61 can be changed freely. The rotor 61 is provided with a plurality of accommodation portions 65 as through holes penetrating in the vertical thickness direction of the rotor 61. Each accommodating portion 65 has, for example, a long hole shape curved in an arc shape, as best seen in FIG.
1 rotates, the first and second casings 60 are rotated.
Are sequentially communicated with the openings 62a and 62b. The plurality of storage portions 65 are configured to be separated from each other via a plurality of partition portions 69.
Is smaller than the respective opening diameters d1 and d2 of the first and second openings 62a and 62b.

As best seen in FIG. 3, the rotor 6
A concave portion 66 is formed in each of the upper surface portion and the lower surface portion of 1, and a plate-shaped auxiliary piece 67 formed separately from the rotor 61 is fitted into the concave portion 66. The auxiliary piece 67 has a plurality of through-holes having the same opening shape as the storage section 65 so as not to block the storage section 65. These through holes also serve as a part of the accommodation section 65. A plurality of rubber sheets 68 made of, for example, silicone rubber are interposed between each of the auxiliary pieces 67 and the rotor 61. The auxiliary piece 67 on the lower surface of the rotor 61 is configured to be pressed against the upper wall 60 a of the casing 60 and the lower wall 60 b of the casing 60. If the rubber sheet 68 is made of silicone rubber, even if the rubber sheet 68 is cooled by the dry ice particles D, the characteristics of the elastic member can be prevented from being significantly impaired. However, in the present invention, as the elastic member interposed between the auxiliary piece 67 and the rotor 61, a material other than silicone rubber can be used.

Next, the operation of the dry ice blasting apparatus A will be described.

First, as the dry ice particles D, for example, a cylindrical one having a diameter of about 3 mm and a length of about 3 to 5 mm is used. Of course, as the dry ice particles D, those having other shapes and sizes can be used. In order to perform the blasting process, the air compressor 2 is operated to generate a predetermined low-pressure air flow in the air conveyance path 3, and the rotary feeder 6 is operated to dry the ice particles in the hopper 5. D is supplied to the air conveying path 3.

The operation of the rotary feeder 6 will now be described. First, as shown in FIG.
2a, the dry ice particles D discharged from the hopper 5 into the pipe 63 are removed from the first opening 62a.
And is stored in the storage section 65. Thereafter, when the rotor 61 is still rotated, the storage portion 65 storing the dry ice particles D moves directly above the second opening 62b, and the dry ice is moved downward from the second opening 62b. The particles D fall and are discharged. Thereby, the dry ice particles D can be supplied to the air conveyance path 3.

As described with reference to FIG.
The first partition 69 is narrower than the opening diameter d1 of the first opening 62a, so that when the partition 69 moves to a position directly below the first opening 62a, the first opening 62a is closed. 62a will not be fully closed. For this reason, the first opening 6
One of the storage portions 65 is always disposed immediately below 2a, and the operation of storing the dry ice particles D from the hopper 5 into the storage portion 65 is continuously performed.
On the other hand, the partition wall 69 has an opening diameter d2 of the second opening 62b.
Is smaller than the second opening 62.
b is not closed by the partition 69 in the fully closed state. Therefore, one of the storage portions 65 is always located immediately above the second opening 62b, and the operation of discharging the dry ice particles D toward the air conveyance path 3 is also performed continuously. Become. Thus, the dry ice particles D can be continuously mixed into the air flow in the air conveyance path 3. This means that the dry ice particles D can be continuously ejected from the nozzle 32. Since each of the housing portions 65 is formed in a long hole shape having a constant width,
It is also possible to prevent a large fluctuation in the supply amount of the dry ice particles D to the air conveying path 3. However,
The present invention is not limited to this, and each housing portion 65 may be formed in a non-elongate hole shape.

When the rotation speed of the rotor 61 is changed, the supply amount of the dry ice particles D to the air conveyance path 3 per unit time also changes. Therefore, the mixing ratio of the dry ice particles D contained in the airflow injected from the nozzle 32 can be adjusted to a ratio according to the user's request.

When the rotor 61 rotates, each of the auxiliary pieces 67 causes the elastic force of the rubber sheet 68 to cause the casing 60 to rotate.
While being pressed against the upper wall portion 60a or the lower wall portion 60b. Therefore, a gap is not generated between the auxiliary piece 67 and the upper wall section 60a and between the auxiliary piece 67 and the lower wall section 60b so that the dry ice particles D do not bite between them. Can be The rotor 61 always partitions the first opening 62a and the second opening 62b in the casing 60. Therefore, the pressure of the compressed air can be prevented from acting on the bottom opening 53 of the hopper 5 even though the compressed air having a constant pressure flows in the air conveyance path 3. As a result, even if, for example, pulsation or pressure rise occurs in the air conveyance path 3, the dry ice particles D can be smoothly discharged from the bottom opening 53 of the hopper 5 without being affected by these. On the other hand, the second
Since the opening 62b and the inside of the branch pipe portion 32 have the same pressure as the pressure of the air conveyance path 3, the dry ice particles D are prevented from being blown up in these portions, and the dry ice particles D are utilized by gravity. As a result, it is possible to appropriately supply the air to the air conveyance path 3.

The dry ice particles D in the hopper 5 may freeze on the inner surface of the hopper 5 by freezing the water on or near the inner surface of the hopper 5. On the other hand, in the present embodiment, as shown in FIG. 2, the contact portion between the uneven surface of the resin coating layer 52 on the inner surface of the hopper 5 and the dry ice particles D can be a point contact. Therefore, the possibility that the dry ice particles D freeze on the surface of the resin coating layer 52 can be reduced by reducing the contact area thereof. Since the surface of the resin coating layer 52 is smooth and its coefficient of friction can be reduced, the dry ice particles D
Can easily be made to slide relatively to the resin coating layer 52. Therefore, clogging of the dry ice particles D in the hopper 5 can be suppressed. However, without providing the resin coating layer 52 on the hopper 5, for example, even when the inner surface of the hopper 5 is an uneven metal surface capable of making point contact with the dry ice particles D, the dry ice particles D 5 can be expected to have an effect of making it hard to freeze on the inner surface.

On the other hand, since the knocker 7 hits the bottom of the hopper 5 at predetermined time intervals, the impact at that time causes the dry ice particles D to freeze on the resin coating layer 52 or the dry ice particles D to freeze each other. This can be prevented beforehand or eliminated ex post facto. As a result, the discharge of the dry ice particles D from the bottom opening 53 of the hopper 5 is further smoothed. The knocker 7 generates noise when the hopper 5 is hit, but since the noise is intermittent, it is possible to prevent the worker from feeling so uncomfortable.

When the dry ice particles D are supplied from the rotary feeder 6 to the air transport path 3, the dry ice particles D are mixed into the air flow in the air transport path 3 and then transported toward the nozzle 32, and thereafter It is ejected from the nozzle 32 to the outside. When the dry ice particles D are transported in the air transport path 3, the dry ice particles D
And the inner surface of the hose 31 collides. However, since the air flow has a low pressure, the collision can be relieved as compared with the case where the air flow has a medium / high pressure. Therefore, it is possible to reduce waste such that the dry ice particles D are severely worn or crushed by collision with the inner surface of the tube 30 or the hose 31.

Since the air flow is at a low pressure, the pressure fluctuation when the air flow is ejected from the nozzle 32 to the outside is smaller than when the air flow is at a medium / high pressure. For this reason, strong turbulence is hardly generated in the nozzle 32,
The problem that the dry ice particles D are crushed due to the turbulence in the nozzle 32 can also be suppressed. In addition, since the pressure fluctuation is small, noise caused by the injection of the air flow is also reduced. In the dry ice blasting apparatus A of the present embodiment, the sound pressure level of the jet noise of the air flow can be reduced from the conventional 120 dB to about 75 dB. With such a level of noise, there is no particular problem when the worker performs the work with the nozzle 32 by hand, and the working environment is improved.

Further, when the air flow is injected from the nozzle 32 to the outside, the pressure fluctuation is small,
This air flow can be prevented from spreading from the nozzle 32 at a large angle. Therefore, it is possible to prevent the dry ice particles D mixed in the air flow from spreading at a large angle, and to increase the projection density of the dry ice particles D. Dry ice particles D
Because it is mixed into the air stream much upstream than
The direction in which the dry ice particles D are jetted can be further stabilized by placing the dry ice particles D in the flow of air. This is suitable for intensively performing blast processing at a desired location.

The blast treatment using the dry ice particles D has the advantages that the surface of the object to be blasted is not severely damaged and that the dry ice particles D do not become a residue. It can also be suitably used for cleaning applications such as home and office equipment such as wall surfaces and floors of offices and fins of air conditioners. On the other hand, the dry ice blasting device A has a structure in which the components are assembled together in the portable frame 1 having the wheels 10, so that the transport is easy. It is suitable for use. The above noise reduction further promotes use in such applications. Further, since the air compressor 2 is used for low pressure, the weight and size of the air compressor 2 itself are smaller than when a medium / high pressure air compressor is used. Since the necessity of using a hose for use can be eliminated, it is preferable to reduce the weight and size of the entire apparatus.
The dry ice blasting device A can be made inexpensive in terms of cost and running cost as compared with the case of using an air compressor for medium / high pressure, and is excellent in economy.

The user of the dry ice blasting apparatus A can control the operation of the dry ice blasting apparatus A by operating the operating section 4A attached to the nozzle 32. It will be better. Since only one hose 31 is connected to the nozzle 32, and only the hose 31 needs to be routed when the nozzle 32 is operated, the conventional technique in which two pipes are connected to the nozzle is used. In comparison, handling of the nozzle 32 is also easier.

The content of the dry ice blasting apparatus according to the present invention is not limited to the above embodiment, and the specific configuration of each part can be freely changed in various ways.

For example, the means for supplying the dry ice in the hopper to the air conveying path is not limited to the rotary feeder having the above-described configuration, and a rotary feeder having a configuration different from the rotary feeder, or a rotary feeder having a different configuration from the rotary feeder may be used. Different types of means can be used.
For example, a reciprocating moving member is provided between the bottom of the hopper and the air conveying path, and a means for receiving the dry ice particles discharged from the hopper by the moving member and then putting the dry ice particles into the air conveying path is used. You can also. However,
In such a reciprocating method, since the supply of dry ice particles into the air conveyance path is intermittent and continuous supply is difficult, a means for easily realizing the continuous supply of dry ice particles is a rotary method. It is preferable to adopt the means of (1).

The specific application of the dry ice blasting apparatus according to the present invention is not limited.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view illustrating an embodiment of a dry ice blast apparatus according to the present invention.

FIG. 2 is a sectional view of a main part of a hopper of the dry ice blasting device shown in FIG. 1;

FIG. 3 is a sectional view of a main part of a rotary feeder of the dry ice blast device shown in FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a sectional view of a check valve of the dry ice blast device shown in FIG. 1;

FIG. 6 is an explanatory diagram illustrating an example of a conventional technique.

[Description of Signs] A dry ice blasting device D dry ice particles 1 portable frame 2 air compressor 3 air transport path 4A operation section 4B control section 5 hopper 6 rotary feeder 7 knocker 10 wheels 30 tube 31 hose 32 nozzle 33 reverse Stop valve 52 Resin coating layer 53 Bottom opening 60 Casing 60a Upper wall (of casing) 60b Lower wall (of casing) 61 Rotor 62a First opening 62b Second opening 65 Housing 67 Auxiliary piece 68 Rubber Sheet (elastic member) 69 Partition

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) B65G 65/48 B65G 65/48 D

Claims (13)

[Claims] 1. An air compressor, an air conveying path for guiding an air flow generated by the air compressor to a nozzle, and a dry ice particle supply means for mixing dry ice particles into the air flow. A dry-ice blasting device, wherein a low-pressure air compressor having an outlet pressure of 1.2 to 2.5 atm is used as the air compressor; The dry ice blast device, wherein the supply means is provided so as to mix dry ice particles into the air flow upstream of the nozzle in the air conveying path. 2. The dry ice particle supply means includes a hopper having a bottom opening shape for storing dry ice particles,
2. The dry ice blasting device according to claim 1, further comprising: a delivery unit configured to discharge dry ice particles from a bottom opening of the hopper and deliver the particles to the air conveyance path. 3. The whole or a part of the inner surface of the hopper,
The dry ice blasting device according to claim 2, wherein the dry ice blasting device has an uneven surface capable of making point contact with dry ice particles. 4. The dry ice blasting device according to claim 3, wherein the uneven surface is a resin-coated surface. 5. The dry dryer according to claim 2, further comprising a knocker that strikes the hopper at predetermined time intervals so as to impact the dry ice particles contained in the hopper. Ice blasting equipment. 6. The delivery means receives the dry ice particles from the hopper and supplies the dry ice particles into the air discharge path while always shutting off a gap between the bottom opening of the hopper and the air discharge path. The dry ice blasting device according to any one of claims 2 to 5, further comprising a moving member that operates. 7. A casing having a bottom opening of the hopper and first and second openings communicating with the air conveying path, respectively, and a rotor rotatably provided in the casing. And at least one housing portion provided on the rotor, and the housing portion moves to a position communicating with each of the first and second openings of the casing with rotation of the rotor. Thereby, a rotary feeder capable of dropping and discharging dry ice particles from the bottom opening of the hopper into the storage portion and dropping and discharging dry ice particles from the storage portion to the air conveyance path, and 6. The rotary feeder according to claim 2, wherein the rotor always shuts off between the first and second openings. Dry ice blasting equipment of crab described. 8. A plurality of said accommodating portions are provided on said rotor, and the width of a partition wall partitioning between said plurality of accommodating portions is equal to each opening width of said first and second opening portions. The dry ice blasting device according to claim 7, wherein the size is smaller than the size. 9. The storage unit is formed as a through hole penetrating in the thickness direction of the rotor, and the rotor is formed by passing through first and second openings of the casing, respectively. Between the upper wall portion and the lower wall portion, the casing is rotatable about an axis extending in the vertical thickness direction of the casing, and an opening of the housing portion is provided on each of an upper surface portion and a lower surface portion of the rotor. An auxiliary piece serving as an edge is provided, and an elastic member that presses the auxiliary piece toward the upper wall or the lower wall of the casing is provided between the auxiliary piece and the rotor. The dry ice blasting device according to claim 8, wherein 10. The dry ice blasting device according to claim 7, wherein the rotation speed of the rotor is changeable. 11. A check valve for preventing a backflow of air toward the air compressor, upstream of a location where dry ice particles are supplied from the dry ice particle supply means in the air transport path. The dry ice blasting device according to any one of claims 1 to 10, further comprising: 12. The air transport path according to claim 1, wherein:
The hose is provided with an operation switch and a wireless transmitter capable of outputting data of the operation contents of the operation switch as a wireless signal. The dry ice blasting device according to any one of claims 1 to 11, wherein the operation of the air compressor and the dry ice particle supply means can be controlled based on a radio signal output from the device. 13. An air compressor, comprising a portable frame having wheels for movement, said air compressor, a motor for driving said air compressor, said dry ice particle supply means, and said air transport path. The piping member to be formed is assembled to the portable frame.
3. The dry ice blasting device according to any one of 2.