JP2001021686A - Washing device using cavitation action of jet flow - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing device showing superior washing effect without unevenness in articles under washing such as tools, bolts, nuts, other metal mechanical parts, etc., used in a nuclear power station or a facility treating RI. SOLUTION: A washing device is constituted of a tank 1 filled with washing water, a pair of work support rollers 8 arranged horizontally in the tank 1, a semicylindrical barrel basket 3 put on the pair of work support rollers 8 for putting in articles to be washed, a nozzle support 2 placed above the barrel basket 3 and attached with a plurality of downward spray nozzles 2a, and a nozzle swinging device for swinging in the axis direction of the barrel basket 3. By swinging the nozzle support 2 in the axis direction of the barrel basket with the nozzle swinging device and spraying high pressure washing liquid toward the articles to be washed, the articles are washed by the action of both cavitation and water hammer of the sprayed liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention
I is used in facilities handling I, and in the cleaning of contaminated tools such as bolts, nuts, metal small machine parts and the like (hereinafter simply referred to as “subject to be cleaned”), cavitation and water hammer due to jet jets. The present invention relates to a cleaning apparatus that can remove radioactive contaminants and general dirt by utilizing both functions.

[0002]

2. Description of the Related Art Conventionally, as a main method of removing radioactivity from an object to be cleaned, manual work, blast cleaning, high-pressure jet cleaning in the air, and the like can be mentioned. Although the method described above has the best cleaning effect, it is troublesome, and exposure of workers to radiation is also a problem. Although the method described in the above also provides a good cleaning effect, there is a problem in that the secondary waste is treated with the abrasive and that the material is excessively shaved. This method requires countermeasures against scattering of contaminated water and mist.

[0003] In order to solve the above problem, there is known a cleaning method utilizing a hydraulic cavitation effect generated on a surface of an object to be cleaned by spraying a cleaning liquid. According to this method, a good cleaning effect can be obtained.However, the nozzle for generating cavitation is conventionally fixed, and the object to be cleaned has a simple operation of moving up, down, left, and right. There is a problem that it often occurs and uneven cleaning occurs.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a cleaning apparatus which solves such a problem in the known cavitation cleaning method and exhibits a more excellent cleaning effect.

[0005]

Means for Solving the Problems (1) Removal of radioactivity adhering to objects to be cleaned, such as tools, bolts, nuts, and other small metal parts used in nuclear power plants or RI handling facilities. In the cleaning of general dirt, a tank 1 filled with washing water, a pair of work supporting rollers 8 disposed horizontally in the tank 1, and an object to be cleaned placed on the pair of work supporting rollers 8 are put. Barrel cage 3 having a semi-cylindrical shape, a nozzle support 2 provided above the barrel cage 3 and having a plurality of downward spray nozzles 2a attached thereto, and a shaft of the barrel cage 3 A nozzle reciprocating oscillating device A for reciprocating in the axial direction. The nozzle reciprocating oscillating device A causes the nozzle support 2 to reciprocate in the axial direction of the barrel cage, and the high-pressure cleaning liquid is directed toward the object to be cleaned. By injecting The object to be cleaned is washed by both the cavitation and the water hammer action by the jet liquid. (2) In the apparatus of the above (1), there is provided a work supporting roller rotating device B for rotating the pair of work supporting rollers 8 forward and backward at a constant cycle, and the workpiece to be cleaned is put by the work supporting roller rotating device B. The barrel basket was swung around its axis. (3) A tank 1 filled with washing water, a pair of work support rollers 8 horizontally disposed in the tank 1, and a work support roller rotating device B 'for rotating the work support rollers 8 in a certain direction. A nozzle support 2 provided above the work supporting roller 8 and having an outer surface spray nozzle 2a, a nozzle support 2 'having an inner surface spray nozzle 2b, and a cylindrical member for cleaning the nozzle supports 2 and 2'. A nozzle reciprocating swinging device A for reciprocating the object in the axial direction, placing the cylindrical object to be cleaned on the pair of work supports 8 and driving the work supporting roller rotating device B ′ to rotate the cylindrical object. The object to be cleaned is rotated in a fixed direction, and the cylindrical portion of the object to be cleaned is sandwiched between the outer surface injection nozzle 2a and the inner surface injection nozzle 2b from outside and inside, so that the inner and outer surfaces of the object to be cleaned can be simultaneously cleaned. did. (4) In the apparatus of (2), the work supporting roller rotating apparatus B for swinging the barrel cage 3 and the work supporting roller rotating apparatus B 'for rotating the cylindrical object to be washed in a certain direction are driven. Switching operation was enabled for the source.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a piping diagram of a cleaning apparatus according to the present invention. 2 is a side view of an embodiment of the cleaning apparatus of the present invention, FIG. 3 is a top view of FIG. 2, and FIG. 4 is a right side view of FIG. 5 is a detailed view of a barrel basket swinging mechanism, FIG. 6 is a detailed view of a work supporting roller rotating device, FIG. 7 is an enlarged perspective view of the barrel basket, and FIG. 8 is a perspective view of a cylindrical cleaning object (for example, a filter). is there. In FIG. 1, reference numeral 1 denotes a stainless steel tank, which is filled with washing water. In the tank 1 filled with the washing water, there is provided a barrel basket 3 on which an object to be washed is placed. As shown in FIG. 7, the barrel basket 3 has a cylindrical portion 3a at one end (left side in FIG. 7).
And a semi-cylindrical portion 3b whose upper half is cut out. That is, since the upper half of the semi-cylindrical portion 3b is open,
From here, the object to be cleaned is loaded from above. On the cylindrical portion 3a, a pressing roller 8a rotatably supported is mounted on the tip of a lever 8b described later, so that the barrel basket 3a can be rocked stably. A nozzle support 2 having a plurality of downward jet nozzles 2a is set in the opened portion so as to be reciprocally swingable in the axial direction of the barrel basket 3 by a nozzle reciprocating swing device A described later. The plurality of downward jet nozzles 2a are attached to the lower portion of the nozzle support 2.

The tank 1 is filled with a cleaning liquid, and the jet from the downward jet nozzle 2a hits the object to be cleaned immersed in the cleaning liquid together with the barrel cage 3, and a cavitation action occurs on the surface of the object to be cleaned. Configuration.

As shown in FIG. 3, the cleaning device of the present invention comprises a nozzle reciprocating swing device A for reciprocating the nozzle support 2 in the axial direction of the nozzle cage 3 as a driving device, and a barrel cage 3 as a driving device.
And a work supporting roller rotating device B 'for rotating a cylindrical filter or the like in a certain direction (see FIG. 3). The object to be cleaned placed in the barrel basket 3 is washed with spray pressure water from a plurality of downward spray nozzles 2a reciprocally driven by the nozzle reciprocating swinging device A above the barrel basket 3. Further, by the work supporting roller rotating device B, the nozzle can be swung in a direction orthogonal to the reciprocating swing direction of the nozzle, so that cleaning can be performed more effectively. Further, not only tools such as bolts and nuts but also cylindrical objects to be cleaned such as filters can be rotated by the work supporting roller rotating device B 'while using the spray nozzles provided to face each other. Thus, the inner and outer surfaces of the cylindrical object to be cleaned can be uniformly cleaned.

Regarding the flow of cavitation,
A description will be given based on FIG. The water stored in the tank 1 passes through the filter 4 and is pushed into a plurality of pressure pumps 6 by a pushing pump 5 connected by a pipe 4a. FIG.
Then, there are a total of 11 pressure pumps 6 from No. 1 to No. 11.
, And is supplied to a plurality of downward jet nozzles 2 a provided on the nozzle support 2 through the header 7,
When a jet stream of about 5 MPa flows toward the object to be cleaned in the barrel basket 3, cavitation occurs on the surface of the object to be cleaned.

The mechanical parts, such as bolts and nuts, to be cleaned are placed on a pair of work supporting rollers 8 (FIG. 7) provided in parallel and horizontally, and a presser provided at the tip of a lever 8b. The cylindrical portion 3a is put on the barrel basket 3 pressed from above by the rollers 8a (FIG. 7). The cavitation generated on the surface of the object to be cleaned by the downward jet from the downward jet nozzle 2a includes bolts placed in the barrel cage 3,
Clean the object to be cleaned such as nuts. At this time, the motor 9 (FIG. 3) for reciprocating the nozzle is rotated. Then the motor 9
The crank 10 attached to the output shaft 9a rotates, the shaft 11 (in the direction of arrow a in FIG. 3) connected to the crank 7 swings back and forth, and the nozzle support 2 (to which a plurality of downward jet nozzles 2a are attached). 4) reciprocates in the axial direction of the barrel cage 3. In this way, by causing the plurality of downward jet nozzles 2a to reciprocate back and forth through the nozzle support 2 while generating cavitation with the object to be cleaned, both cavitation and water hammer can be performed thoroughly. Washing is performed.

As another method for uniformly spreading the cavitation on the object to be cleaned, a mechanism for swinging the barrel cage 3 around its axis (in the circumferential direction) will be described. The barrel basket 3 can be rocked by driving the work supporting roller rotating device B in FIG. The details will be described with reference to FIGS. Barrel basket swing motor 1
When 2 is rotated, the barrel basket swinging crank 15 (FIG. 5B) is rotated via the gear 14 driven and connected by the drive chain 13. Barrel basket swing crank 15
Is rotated, the shaft 16 connected thereto moves back and forth, and further, the gear 17 connected thereto rotates right and left. The movement is transmitted to the work support roller 8 (FIG. 7) via the gear 18 (FIG. 6), and the work support roller repeats the forward and reverse rotations at a constant cycle, and the barrel cage 3 placed thereon is rotated in a circumferential direction. Swing in the direction.

Further, a cylindrical object 21 (for example, a filter as shown in FIG. 8) can be subjected to cavitation cleaning. However, in this case, the above-described barrel basket 3 is not used, and the cylindrical object 21 is first attached to the nozzle support 2 ′ having the inner surface spray nozzle 2 b, , And is placed on a pair of work supporting rollers 8 on which the barrel basket 3 is placed and washed while rotating. Thereby, both the inner surface and the outer surface of the cylindrical object to be cleaned 21 can be cleaned. The spray nozzles 2a and 2b for the outer surface and the inner surface are provided with the nozzle support 2
Cavitation is generated while moving left and right in the same manner as the movement of. On the other hand, the cylindrical object to be cleaned is rotated on the pair of work supporting rollers 8 in a certain direction. The rotation is performed by driving a barrel basket rotating motor 20 provided separately from the nozzle support rotating device B described above. In this case, the gear is switched by pushing a rod (not shown), and the rotation is switched to one direction in order to rotate the cylindrical object 21 to be cleaned. When the barrel cage rotation motor 20 rotates, the rotation is transmitted to the gear via the chain. The movement is transmitted to the work supporting roller 8 via a gear, and the cylindrical object to be cleaned 21 (FIG. 8) placed thereon rotates in a certain direction. Thus, the inner and outer surfaces of the cylindrical object to be cleaned 21 can be simultaneously cleaned by the inner and outer surface nozzles 2a and 2b by cavitation.

[0013]

(1) According to the first aspect of the present invention, because of the underwater cleaning utilizing the cavitation action, the worker is less exposed to radiation compared to manual work, the amount of secondary waste is small, and there is a risk of excessive shaving. , And is not easily influenced by the shape of the object to be cleaned. (2) According to the second and fourth aspects, not only the nozzle but also the object to be washed is swung, so that cavitation and water hammer can be applied to the object to be washed evenly, thereby eliminating unevenness in washing. it can. (3) According to the third aspect, the inner and outer surfaces of the cylindrical object to be cleaned such as a filter can be simultaneously cleaned by rotating the object on the work supporting roller.

[Brief description of the drawings]

FIG. 1 is a piping diagram of an apparatus.

FIG. 2 is an overall front view of the apparatus.

FIG. 3 is a top view of FIG. 2;

FIG. 4 is a right side view of FIG. 2;

FIG. 5 is a detailed view of a barrel basket swinging device.

FIG. 6 is a detailed view of a drive unit provided with a barrel basket swinging device and a barrel basket rotating device.

FIG. 7 shows a related configuration of a barrel basket and a supporting roller thereof.

FIG. 8 is a perspective view of a cylindrical filter.

[Explanation of symbols]

A Nozzle reciprocating rocking device B (Rotating barrel cage) Work supporting roller rotating device B '(Rotating and rotating a cylindrical object to be cleaned) Work supporting roller rotating device 1 Tank 2 Nozzle support 2a, 2b Nozzle 3 Barrel cage 4 Filter 5 Push-in pump 6 Pressurizing pump 7 Header 8
Work support roller 8a Holding roller 9 Nozzle reciprocating rocking motor 9a Output shaft 10 Crank 11 Shaft 12 Barrel basket rocking motor 13 Drive chain 14 Gear 15 Barrel basket rocking crank 16 Shaft 17,18 Gear 19 Cylindrical object to be cleaned 20 Barrel Basket rotation motor 21 Cylindrical object to be cleaned

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiyuki Ishikawa 1408 Takada, Kashiwa-shi, Chiba Prefecture Atox Technology Development Center Co., Ltd. (72) Inventor Kazuki Komatsu 1408, Kashiwa-shi Chiba Prefecture Atox Technology Development Center Co., Ltd. (72) Inventor Naoto Goi 1408 Takada, Kashiwa City, Chiba Pref. Atox Technology Development Center Co., Ltd. (72) Inventor Kazuaki Ito 1408 Takada Kashiwa City, Chiba Pref. Atox Technology Development Center Co., Ltd. F-term (reference) 4F033 PA01 PB23

Claims (4)

[Claims] 1. Cleaning for removing radioactivity adhering to objects to be cleaned such as tools, bolts, nuts and other small metal machine parts used in nuclear power plants or RI handling facilities and cleaning general dirt. Tank filled with water (1)
A pair of work supporting rollers (8) horizontally disposed in the tank (1), and a semi-cylindrical shape for receiving an object to be cleaned placed on the pair of work supporting rollers (8). A barrel cage (3) provided above, a nozzle support (2) provided above the barrel cage (3) and having a plurality of downward spray nozzles (2a) attached thereto, and the nozzle support (2) is connected to the barrel cage (3). (3)
A nozzle reciprocating rocking device (A) for reciprocating in the axial direction of the nozzle cage. The nozzle reciprocating rocking device (A) reciprocates the nozzle support (2) in the axial direction of the barrel cage. By injecting high-pressure cleaning liquid toward the object to be cleaned,
A cleaning device using a cavitation action of a jet jet, wherein an object to be cleaned is washed by both cavitation action and a water hammer action by a jet liquid. 2. The apparatus according to claim 1, further comprising a work support roller rotating device (B) for rotating the pair of work support rollers (8) forward and reverse at a predetermined cycle. ), Wherein a barrel basket containing an object to be cleaned is swung around its axis. 3. A tank (1) filled with washing water, a pair of work supporting rollers (8) horizontally disposed in the tank (1), and the work supporting rollers (8) are moved in a predetermined direction. A work supporting roller rotating device (B ') to be rotated, a nozzle support (2) provided above the work supporting roller (8) and having an outer jet nozzle (2a) and a nozzle having an inner jet nozzle (2b). A nozzle reciprocating rocker (A) for reciprocating the nozzle support (2) in the axial direction of the cylindrical object to be cleaned; The cylindrical cleaning object is rotated in a fixed direction by being placed on a work support (8) and driving a work support roller rotating device (B ′), and the outer surface spray nozzle (2a) and the inner surface spray nozzle are rotated. With (2b), the cylindrical portion of the object to be cleaned is moved outside and inside From scissors, cleaning system according to the cavitation action of the jet stream, characterized in that the set to be simultaneously cleaning the inner and outer surfaces of the cleaning object. 4. A work supporting roller rotating device (B) for oscillating a barrel basket (3) according to claim 2 and a work supporting roller rotating device (4) for rotating a cylindrical object to be cleaned in a certain direction. B ') is a cleaning device using a cavitation effect of a jet jet, wherein the driving source can be switched.