JPH03287377A - Blasting device - Google Patents

Abstract

PURPOSE:To unpack the package of the worked object inside a sub-room and to perform the air blow finishing after blasting completion, by providing the sub-room which becomes communicatable with a blast room with its adjoining with the blast room, and connecting one end of the recovery line composing a recovery mechanism to the sub-room. CONSTITUTION:A sub-room 50 communicatable with a blast room 10 is provided with its adjoining with the blast room 10 and the packing of the worked object is unpacked in this sub-room 50. Moreover, the finishing of an air blow, etc., are performed inside this sub-room 50, in the case of carrying out the part to be worked after the blast completion. In this case, a recovery mechanism is composed in the sub-room 50 similar to the blast room 10 and the solid body dispersed in the sub-room 50 is recovered via the recovery line 31 of the recovery mechanism surely at the specified place.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a blasting device, and particularly to a blasting device suitable for application to blasting for decontaminating nuclear power equipment.

[Conventional technology]

A blasting method is one of the methods for removing sludge and the like adhering to equipment and the like.

As is well known, the blasting method involves spraying a blasting material (abrasive material) made of sand (usually silica sand) or iron particles onto the surface of an item (workpiece) to remove rust and foreign matter (sludge, etc.) from the surface. Alternatively, it is a type of polishing process that involves polishing and polishing. In the above, when sand is used as the blasting material, it is called a sandblasting method, and when iron particles are used, it is called a grid blasting method. In addition, in recent years, blasting methods that use sand or iron particles as the blasting material, as mentioned above, have been found to be too hard and cause unnecessary damage to the product, so resin-based blasting materials have been used. Blasting methods are also being implemented.

[Problem to be solved by the invention]

By the way, in the above-mentioned blasting process, the following inconveniences have occurred particularly when blasting equipment related to nuclear power facilities.

That is, when blasting is performed on equipment and equipment related to nuclear power facilities, sludge and the like adhering to these equipment may be radioactive. Therefore, to prevent sludge and other deposits from falling off and dispersing into the surrounding area during transportation, the equipment to be blasted is transported to the blasting machine in a fully packaged state. . Naturally, in order to perform blasting, the packaging must be unpacked, or there is a risk that deposits such as sludge may escape when unwrapping.

Conventionally, therefore, a chamber or the like isolated from the surrounding space was constructed in the vicinity of the blasting device, and the packaged items were unwrapped in the chamber before being carried into the blasting device, or the items were unwrapped. The method used was to transport the product into the blast chamber in its original state and unwrap it inside the blast chamber.

However, the former method requires a separate treatment facility for sludge or the like in addition to the blasting device, resulting in high costs. On the other hand, in the latter method, it is difficult to spray the blasting material due to the presence of nozzles and piping inside the blasting chamber. Furthermore, after unwrapping, the unwrapped paper or packaging bag must be taken out of the blasting room, and even in that case, the sludge etc. on the wrapping paper must be removed inside the blasting room. This has the disadvantage of requiring a troublesome procedure, such as the need to completely remove it before taking it out.

The present invention has been made in view of the above-mentioned circumstances, and is particularly aimed at improving work efficiency when blasting items related to nuclear power equipment, and in particular, by starting the actual blasting process from the time the item is delivered to the blasting device. The purpose of the present invention is to provide a blasting device that can improve the efficiency of the series of operations and ensure a safe environment.

[Means to solve the problem]

The blasting device according to the present invention includes a blasting chamber that stores a workpiece and constitutes a blasting work space, a blasting device installed in the blasting chamber that force-feeds blasting material to a nozzle, and In a blasting device equipped with a recovery mechanism for recovering solid materials such as blasting materials, a sub-chamber is provided adjacent to the blast chamber and is capable of communicating with the blast chamber, and a recovery line forming the recovery mechanism is provided in the sub-chamber. It is characterized in that one end of the two is connected.

[Effect]

Since the blast chamber is provided with an auxiliary chamber adjacent to the blast chamber that can communicate with the blast chamber, the workpiece can be unwrapped in this auxiliary chamber. Further, when the workpiece is to be transported out after the blasting is finished, finishing such as air blowing can be performed in this sub-chamber. Furthermore, since the auxiliary chamber is provided with a recovery mechanism similar to the blast chamber, the solid matter dissipated in the auxiliary chamber can be reliably collected at a predetermined location.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show an embodiment of a blasting device according to the present invention, and in FIG.
The one shown is the blasting device.

This blasting device 1 includes a blasting chamber 10 that stores workpieces and constitutes a blasting work space, a blasting device 21 provided in the blasting chamber for pressurizing the blasting material to a nozzle 24, and It is equipped with a collection mechanism 30 for collecting solid matter such as blasting material in IO, and further includes:
A sub-chamber 50 (FIG. 2) is provided adjacent to the blast chamber 10 and can communicate with the blast chamber 10, and one end of a recovery line 31 constituting the recovery mechanism 30 is connected to the sub-chamber 50. It is what it is.

In this embodiment, the blasting device 1 is used for blasting for decontaminating equipment related to nuclear power facilities, and the blasting material is made of resin. The resin constituting the blasting material may be thermosetting, such as melamine resin.

In the blast chamber 10, reference numeral 1111 (FIG. 2)
12 is a working window for inserting the arm during work.
is a congratulations to see the working status inside the blast chamber IO. Although not shown, the proximal end of a rubber glove is attached to the inner surface of the working window 1111 while maintaining airtightness with the inside of the blasting chamber 10. Reference numeral 13 is a grating on which a workpiece to be blasted is placed.

The portion of the blast chamber 10 below the grating 13 is formed in a so-called funnel shape that tapers downward, and at the lower end of the lower space 14,
One end of the recovery line 31 constituting the recovery mechanism 30 is open. Further, an outside air intake port 15 is formed in the upper part of the blast chamber 10, and a filter (not shown) is attached to the outside air intake port 15 in parentheses. Reference numeral 16 is a differential pressure gauge. Further, as shown in FIG. 1, one end of a blasting material supply line 18 extending from the lower end of the blasting material supply tank 17 is open in the lower space 14 of the blasting chamber 10.

In the blast chamber IO, a nozzle 24 of a device 21 is used for spraying.
is installed. In this embodiment, the spraying device 21 is a dry type, but is a direct pressure type, in other words, the blasting material is sealed in a blasting material pressure feeding tank 22 and compressed gas is sent in, and a discharge port 23 provided at the bottom of the blasting material pressure feeding tank 22 is used for the spraying. The blasting material discharged from the nozzle 24 is sent together with compressed air.
The method is such that it is injected from the Furthermore, a mist supply pipe 61 for supplying water atomized by a humidifier 60 is connected to the blasting material pressure feeding tank 22 of the spraying device 21 .

In this embodiment, the recovery mechanism 30 includes the recovery line 31, a blasting material recovery tank 32 that is provided after the recovery line 31, and separates and recovers reusable blasting material from the recovered solids; The blasting material recovery tank 3
2, and includes a dust recovery device 34 for recovering fine solids that have passed through the blasting material recovery tank 32 among the recovered solids.

The blasting material recovery tank 32 is connected to the upper part of the blasting material pressure feeding tank 22, and forms a type of chamber. This blasting material recovery tank 32 and the blasting material pressure feeding tank 22 are configured to be able to communicate with each other. Two lines are connected from this blasting material recovery tank 32: the recovery line 31 and a discharge line 33 that reaches near the lower end of a dust recovery tank 35 that constitutes a dust recovery device 34.

The dust recovery device 34 is mainly composed of a dust recovery tank 35 formed in a so-called silo shape, and an opening/closing lid 36 is provided at the lower end of the dust recovery tank 35. One end of the discharge line 33 extending from the blasting material recovery tank 32 is open near the lower end of the dust recovery tank 35 . In addition, a separately installed blower 4 is installed above the dust collection tank 35.
An exhaust port 37 communicating with the intake port 0 is open.

Although not shown, a pipe further extending to the exhaust chamber is connected to the exhaust port 41 of the blower 40.
A HEPA filter is installed inside the exhaust chamber.

The auxiliary chamber 50 is provided adjacent to the blast chamber 10 and is configured to communicate with the blast chamber IO. An opening/closing door 19 that slides up and down is provided inside the blast chamber 10 on the side of the sub-chamber 50, so that the blast chamber IO and the sub-chamber 50 can be partitioned off. The code 21 is this opening/closing door 19.
This is a driving cylinder for driving. This sub-chamber 5
Similarly to the blast chamber 10, the blast chamber 10 is also provided with two working windows 5151 and a window 52 for viewing the working status. Further, this auxiliary chamber 50 is also formed in a funnel shape below the grating 53, and at the lower end of the funnel-shaped lower space 54, the recovery line 31 constituting the recovery mechanism 30 is disposed at the lower end of the funnel-shaped lower space 54. One end is open. Furthermore, an outside air intake port 55 is formed in the upper part of the subchamber 50, and a filter (not shown) is attached to this outside air intake port 55. Further, reference numeral 56 is a door for this sub-chamber 50.

Next, the operation of the blasting device 1 having the above configuration will be explained.

In the above-mentioned blasting apparatus 1, the workpiece to be blasted is first carried into the auxiliary chamber 50 through the door 56 in a packaged state. At that time, the opening/closing door 19 is kept closed by driving the driving cylinder 20.

Once the workpiece is carried into the auxiliary chamber 50, the door 56 is closed and the blower 40 of the recovery mechanism 30 is activated. The collection mechanism 30 is activated by the operation of the blower 40. That is, the dust collection tank 35, the discharge line 33. The blasting material recovery tank 32 and the subchamber 5 via the recovery line 31
The air in the air is sucked into the blower 40. On the other hand, as a result, the inside of the auxiliary chamber 50 becomes a negative pressure, so that outside air is introduced into the auxiliary chamber 5o from the outside air intake port 55 via a filter (not shown).

When the blower 40 operates as described above, the workpiece carried into the subchamber 50 is unpacked.

This work is done by inserting the arm into the glove set inside through the working window 51.51 and looking at the congratulatory message 52. When unpacking, some of the solid matter such as sludge that has adhered to the workpiece or fallen into the packaging bag may spill out into the surrounding area. Since the collection line 3 is drawn by the collection line 3, the spilled deposits fall below the grating 53 and are drawn into the collection line 31.

As described above, the fine particles of deposits generated in the subchamber 50 and drawn into the recovery line 31 are transferred to the blasting material recovery tank 32.
passes through the dust collection tank 3 via the discharge line 33.
5 and are stored at the bottom of the dust collection tank 35, or extremely fine particles are led to the outside through the exhaust port 37 provided above the dust collection tank 35 and are then collected at the bottom of the dust collection tank 35.
Collected by A filter.

Once the workpiece is unwrapped in the auxiliary chamber 50 as described above, the drive cylinder 20 is operated to open the opening/closing door 19, the workpiece is transferred into the blasting chamber 10, and then the opening/closing door is opened. Close 19. The wrapping paper or packaging bag used to package the workpiece may be left in the subchamber 50.

Thereafter, the spraying device 21 may be operated to carry out the blasting operation as usual. At this time, the humidifying device 60 is started at the same time as the blasting operation is started.

Due to the blasting of the blasting material, the blasting material that has been sprayed, fragments of the blasting material that collided with the workpiece, and deposits removed by the blasting material are scattered in the blasting chamber IO. All of them are collection mechanism 3
0 is discharged to the outside of the blast chamber 10.

The blasting materials, crushed pieces, dust, and other solid materials discharged from the blasting chamber IO reach the blasting recovery tank 32 via the recovery line 31, and the blasting materials that have relatively maintained their original particle size are collected. Collected in tank 32,
Other fine particles reach the dust collection tank 35 via the discharge line 33. Among them, extremely fine dust etc. are removed from the exhaust port 37. The dust passes through the blower 40 and is collected by the HEPA filter (not shown), and the rest is stored at the bottom of the dust collection tank 35. Then, the blasting material recovered by the blasting material recovery tank 32 is again supplied to the blasting material pressure feeding tank 22 and sprayed from the nozzle 24.

Further, as the absolute amount of blasting material gradually decreases as the work progresses, the blasting material corresponding to the amount is newly supplied from the blasting material supply tank 17.

Note that when the humidifier 60 operates, atomized water, that is, moisture, is supplied from the mist supply pipe 61 into the blasting material pressure-feeding tank 22 . That is, this increases the humidity within the blasting material pressure feeding tank 22, making it possible to effectively prevent the resin blasting material from being charged. This prevents dust from adhering to the blasting material, and the blasting chamber! The dust adsorbed by the blasting material is not scattered and adsorbed on the inner surface of the congratulations 12 of No. 0, and work efficiency can be improved.

Once the required blasting process has been completed, the first step is to start spraying with device 2.
After that, the blower 40 is stopped after waiting until all the residual dust and the like in the blasting chamber IO is collected. After that, first open the door 56 of the auxiliary chamber 50 and take out the wrapping paper remaining inside, then open the opening/closing door 19 and transfer the blasted items in the blasting chamber 10 to the auxiliary chamber 50. You can take it out through. In addition, when air blowing or the like is performed for finishing after the blasting process is completed, the workpiece is moved from the blasting chamber 10 to the auxiliary chamber 50 while the blower 40 is in operation, and the work is carried out in this auxiliary chamber 50. All you have to do is

As described above, according to the blast processing apparatus 1, the sub-chamber 50 is provided adjacent to the blasting chamber IO, and the sub-chamber 5 of the parentheses is
Since the structure is such that the dust generated in the sub-chamber 50 can also be collected by the collection mechanism 30 in the same way as the blast chamber 10, the sub-chamber 50
You can unpack the workpiece inside, or perform finishing cleaning work such as air blowing after blasting is completed.
In addition, the workpiece can be transferred directly to the blast chamber IO. Therefore, it is possible to reliably prevent deposits from dispersing to the surrounding area during unpacking work, etc., and is extremely effective when applied to decontamination blasting work for equipment related to nuclear power equipment. Moreover, since the recovery mechanism 30 for recovering dust and the like in the auxiliary chamber 50 is configured using the recovery mechanism 30 for recovering blasting material in the blast chamber IO, it can be realized at low cost.

〔Effect of the invention〕

As explained above, according to the blasting apparatus according to the present invention, the sub-chamber is provided adjacent to the blasting chamber, and the dust generated in the sub-chamber is also collected at a required location in the same manner as in the blasting chamber. In the auxiliary chamber, the workpiece can be unpacked and finished with air blow after blasting, and the workpiece can be directly received and transferred to and from the blasting chamber.

Therefore, in particular, the work of unwrapping the workpiece to be decontaminated can be done efficiently, and any concerns about contamination of the surrounding environment can be eliminated.

Moreover, since the collection mechanism for collecting dust and the like in the auxiliary chamber is configured using the blast collection mechanism in the blast chamber, excellent effects such as being realized at low cost are achieved.

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of the present invention. Figure 1 is an overall elevational view of a blasting device, and Figure 2 is a blast chamber, an upper chamber, and an auxiliary chamber of the blasting device according to this embodiment. FIG. Fig. 2 1...Blast device, 21...Blowing device, 30...Recovery mechanism, 50...Sub-chamber. 1O...Blast chamber, 24...Nozzle, 3I...-Recovery line,

Claims (2)

[Claims] (1) A blasting chamber that stores workpieces and constitutes a blasting work space, a blasting device that pressure-feeds blasting material to a blasting nozzle installed in the blasting chamber, and solid materials such as blasting material in the blasting chamber. In a blasting device equipped with a recovery mechanism for recovering the blast, a sub-chamber is provided adjacent to the blast chamber and is capable of communicating with the blast chamber, and one end of a recovery line constituting the recovery mechanism is connected to the sub-chamber. A blasting device. (2) The blasting device according to claim 1, which is for decontaminating radioactively contaminated articles.