JPH04370800A - Ice blasting device for valve box cleansing - Google Patents

Abstract

PURPOSE:To obtain an ice blasting device for cleaning a valve box that never scatter ice particles to outside the valve box during ice blasting process. CONSTITUTION:An ice blasting device for cleaning valve box sends ice particles by compressed air and ejects the ice particles from a blasting nozzle 9 to clean a valve box 1 of a sluice valve or so. A cleaning cover 7 which seats on a flange part 8 of the valve box 1, an ice particle feeder tube 10 to the end of which the blasting nozzle 9 is connected and which penetrates the cleaning cover 7 and through which the ice particles are sent to the blasting nozzle 9, a nozzle driving mechanism 11 which is provided on the cleaning cover 7 and elevates and rotates the blasting nozzle 9 freely, as well, via the ice particle feeder tube 10, and an exhaust duct 12 which is provided on the cleaning cover 7 and exhausts ice particle mist which is ejected into the valve box 1, are provided to the ice blasting device.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice blasting device for cleaning valve boxes such as gate valves by transporting ice particles using pressurized air and spraying the ice particles from a blast nozzle.

0002

2. Description of the Related Art A valve box such as a gate valve is generally cleaned by spraying cleaning water onto the inner peripheral surface of the valve box.

[0003] In the above-mentioned cleaning method, since the cleaning water is sprayed linearly from the spray nozzle, uneven cleaning may occur.

[0004] Therefore, an ice blast method has been considered in which ice particles, which are fed by pressurized air, are diffused and sprayed from a blast nozzle toward the inner peripheral surface of the valve box to clean it.

[0005]

[Problem to be Solved by the Invention] However, when cleaning large gate valves used in nuclear power generation equipment, etc., ice particles injected inside the valve box become a mist containing radioactive materials and exit the valve box. There is a problem that the waste is discharged into the surrounding area and contaminates the surrounding area, and there is also a problem that measures must be taken to ensure the safety of workers during cleaning.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an ice blasting device for cleaning a valve box in which ice particles are not scattered outside the valve box when blasting ice particles.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for cleaning valve boxes such as gate valves by force-feeding ice grains with pressurized air and jetting the ice grains from a blast nozzle. In this ice blast device for cleaning valve boxes, a cleaning cover is installed on the flange of the valve box to close the opening of the valve box, and a blast nozzle is connected to the tip of the cleaning cover, and the blast nozzle is inserted through the cleaning cover. an ice particle supply pipe for force-feeding ice particles to the cleaning cover; a nozzle drive mechanism that is provided on the cleaning cover and drives the blast nozzle so as to be able to move up and down and freely rotate through the ice particle supply pipe; A mist discharge duct is provided for discharging the mist of ice particles injected into the valve box from the valve box.

[0008]

[Operation] According to the above structure, the cleaning cover is attached using the flange of the valve box, the ice particle supply pipe is inserted through the cover, and ice particles are sprayed onto the inner surface of the valve box from the blast nozzle at the tip of the pipe. In addition, the nozzle drive mechanism cleans the blast nozzle via the ice grain supply pipe by moving it up and down and freely rotating, and the mist of ice grains injected into the valve box is created using a mist provided on the cleaning cover. By discharging through the discharge duct, cleaning can be done without causing ice particles to scatter outside the valve box.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is an overall view showing one embodiment of the present invention.
In the figure, 1 is a valve box such as a gate valve, and the figure shows a state in which the gate valve body is removed.

First, the valve box 1 has inlet/outlet portions 3, 3 connected to the pipes 2, 2, a valve body accommodating portion 4, and an opening 5 into which the valve body is inserted above the valve body accommodating portion 4. A flange portion 6 is provided on the outer periphery of the opening 5.

A cleaning cover 7 is attached to this flange portion 5 with bolts 8 via a packing. An ice grain supply pipe 10 having a blast nozzle 9 connected to its tip is inserted through the cleaning cover 7, and ice grains are force-fed to the blast nozzle 9 through the ice grain supply pipe 10. A nozzle drive mechanism 11 is provided on the cleaning cover 7, and the blast nozzle 9 is driven by the nozzle drive mechanism 11 so as to be able to move up and down and turn freely via the ice particle supply pipe 10. Further, the cleaning cover 7 is provided with a discharge duct 12 for discharging the mist of ice particles injected into the valve housing 1 from the valve housing 1.

This nozzle drive mechanism 11 includes a lower plate 13 provided on the cleaning cover 7, a plurality of guide rods 14 erected on the lower plate 13, and an upper plate attached to the upper end of the guide rod 14. A plate 15 is provided and configured. A movable plate 16 is provided between the upper and lower plates 15 and 13 so as to be movable up and down while being guided by a guide rod 14.
It is moved up and down by the rotation of a screw shaft 17 provided in between.

The ice grain supply pipe 10 is rotatably housed in a fixed pipe 18 suspended from a movable plate 16, and its upper end is connected to an ice grain supply hose 20 via a swivel joint 19.
connected to.

This nozzle drive mechanism 11 will be explained in more detail with reference to FIGS. 2 to 5.

First, the movable plate 16 is provided with a linear bush 21 through which the guide rod 14 is inserted, so that the linear bush 21 is movable up and down along the guide rod 14. The lower end of this guide rod 14 is supported by a linear boss 22 provided on the lower plate 13.

The screw shaft 17 is screwed into a screw bearing 23 provided on the movable plate 16, and its lower portion is rotatably supported by a support 24 of the lower plate 13. A driven bevel gear 25 is attached to the lower end of the screw shaft 17, and a lifting motor 26 is provided on the lower plate 13, and a driving bevel gear 27 that meshes with the driven bevel gear 25 is provided on the shaft of the motor. Also, the motor 26
An encoder 28 for detecting the elevation position is located opposite to the
is provided.

The ice grain supply pipe 10 protrudes from the fixed pipe 18 on the moving plate 16, and is rotatably supported by a bearing 30 provided on the moving plate 16. A driven sprocket 31 is attached to the upper part of the ice grain supply pipe 10, and a driven sprocket 31 is attached to the upper end of the ice grain supply pipe 10. The swivel joint 19 is installed. An ice particle supply hose 20 is connected to this swivel joint 19. Further, the moving plate 16 is provided with a turning motor 32, a driving bevel gear 33 is provided on the shaft thereof, and a driven bevel gear 34 that meshes with the driving bevel gear 33 is rotatably supported by a support body 35 provided on the plate 16. Ru. A driving sprocket 36 is integrally provided on the driven bevel gear 34, and this driving sprocket 36 and the ice grain supply pipe 10
is connected to a driven sprocket 31 by a chain 37,
The rotation of the turning motor 32 rotates the driving sprocket 36 via the bevel gears 33 and 34, and the driven sprocket 31 is rotated via the chain 37, thereby rotating the ice particle supply pipe 10.
is now rotated. Further, an encoder 38 is provided opposite to the turning motor 33 to detect the turning position. The moving plate 16 also has an ice grain supply pipe 10.
Rotation limit switch 39 detects the origin of the rotation position of
is provided.

Further, a lowering limit switch 40 is provided on the lower plate 13 to regulate the lower limit position of the movable plate 16.
is provided below the movable plate 16, and a lowering press plate 41 for actuating the lowering limit switch 40 is provided. Further, a rising press plate 42 is provided above the plate 16, and although not shown in the figure, this rising press plate 42 operates a rise limit switch provided on the upper plate 15 to regulate the upper limit position. It looks like this. In addition, 43 is the upper and lower plate 15
, 13, and 44 are support rollers that support the fixed pipe 18 provided on the lower surface of the lower plate 13.

Next, details of the cleaning cover 7 will be explained with reference to FIGS. 6 to 8.

The cleaning cover 7 is attached to the flange portion 6 of the valve box 1.
It consists of a flange part 50 attached to the valve body 1 and a cover part 51 that covers the opening 5 of the valve box 1. On the top surface of the cover part 51,
The lower plate 13 of the nozzle drive mechanism 11 is attached. This cover portion 51 is provided with a connection port 52 for connecting the mist discharge duct 12. Further, this cover portion 51 is provided with a viewing window 53 for looking into the inside of the valve box 1.
A cleaning nozzle 54 for cleaning the viewing window 53 from the inside is also attached.

Next, as shown in FIGS. 9 and 10, the blast nozzle 9
Explain the details.

As shown in FIGS. 9(a) and 9(b), the ice particle supply pipe 10 is rotatably supported by a bearing 60 provided at the lower end of the fixed pipe 18 and protrudes from the fixed pipe 18. be made into A flexible hose 61 is connected to the lower end of this ice particle supply pipe 10, and a nozzle portion 62 whose spray angle can be freely changed is formed at the tip of the flexible hose 61.

First, a flexible hose 6 is connected to the ice particle supply pipe 10.
A seat 63 extending along 1 is attached, and a pair of parallel arms 64 are provided depending from the seat 63, and the lower ends of the arms 64 are connected by a joint boss 65. This arm 6
A movable boss 66 that can move up and down along the arm 64 is provided between the four. This moving boss 66 has a guide protrusion 67 that engages with the groove 64a of the arm 64.
It is designed to stay in place. This moving boss 66 rotatably supports a shaft 69 of a hose reel 68. Two locking grooves 70 and 71 are formed on this shaft 69, and a ball click device 72 that engages with the locking grooves 70 and 71 is provided on the movable boss 66. This hose reel 6
A compression spring 73 is provided between the ball click device 8 and the movable boss 66, and the ball click device 72 is normally held in a position where it engages with the locking groove 70 of the shaft 69, as shown in FIG. 9(a).

The hose reel 68 has a reel portion 74 around which a portion of the flexible hose 61 is wound, and a handle portion 75 that rotates and presses the reel portion 74. A notch 76 is formed in the reel portion 74 , and the nozzle portion 62 at the tip of the flexible hose 61 is supported in the notch 76 via a support 77 . Further, a pinion 78 is provided at the end of the shaft 69 of the hose reel 68, and racks 79, 79 that mesh with the pinion 78 are provided on the arm 64, respectively.

To change the spray angle of the nozzle portion 62 of the blast nozzle 9, manually press the handle 75 and remove the pinion 78 from the rack 79 as shown by the two-dot chain line in FIG. 9(a). At the same time, the ball click device 72 engages with the locking groove 71 . In this state, rotate the handle 75,
The spray angle of the nozzle portion 62 is adjusted as shown in FIG. At this time, since the flexible hose 61 is wound around the hose reel 74, the movable boss 66 moves up and down as appropriate between the arms 64. The angle of the nozzle part 62 can be adjusted by approximately 90 degrees from the vertical direction to the horizontal direction as shown in the figure. After adjusting the angle to an appropriate angle, pull the handle 75 shown in FIG. 9 to the position where the pinion 78 meshes with the rack 79. In this state, the ball click device 72 engages with the locking groove 70, and the reel part 74 cannot rotate due to the engagement of the pinion 78 and the rack 79, so the nozzle part 62 is fixed at the adjusted spray angle position. The Rukoto.

Next, the operation of this embodiment will be explained.

First, as shown in FIG. 1, the valve body 1 to be cleaned is removed from the valve body 1, and the cleaning cover 7 supporting the nozzle drive mechanism 9 is attached to the flange portion 6 thereof. At this time, the upper and lower spray angles of the blast nozzle 9 can be adjusted by operating the handle 75 to control the valve box 1 to be cleaned, as explained in FIGS.
Set in advance according to the

After the cleaning cover 7 is attached, ice particles are injected from the blast nozzle 9 onto the inner surface of the valve box 1 through the ice particle supply pipe 10 from the ice particle supply hose 20. At this time, Figure 2~
As explained in 5, the lifting motor 26 and the turning motor 3
2 to move the ice grain supply pipe 10 up and down as well as rotate it, the ice grains jetted from the blast nozzle 9 can be sprayed all over the inner surface of the valve box 1 to clean it. Further, the discharge duct 12 is maintained at a negative pressure, and the mist of ice particles after being sprayed is sucked and exhausted from the discharge duct 12.

[0030]

[Effects of the Invention] In summary, according to the present invention, a cleaning cover is attached using the flange portion of the valve box to cover the valve box, and ice particles are injected onto the inner surface of the valve box from a blast nozzle that can be raised and lowered and rotated freely. At the same time, the mist of ice particles injected into the valve box is discharged from a discharge duct provided on the cleaning cover while cleaning, thereby making it possible to clean the valve box without causing any ice particles to scatter outside the valve box.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram illustrating an embodiment of the present invention.

FIG. 2 is a front view showing details of the nozzle drive mechanism in FIG. 1;

FIG. 3 is a left side view of FIG. 2;

FIG. 4 is a view taken along the line A-A in FIG. 2;

FIG. 5 is a view taken along the line BB in FIG. 2;

FIG. 6 is a plan view showing details of the cleaning cover of FIG. 1;

FIG. 7 is a front view of FIG. 6;

FIG. 8 is a sectional view taken along line CC in FIG. 6;

FIG. 9 is a detailed view of the blast nozzle of FIG. 1;

FIG. 10 is a diagram showing the operating state of FIG. 9;

[Explanation of symbols]

1. Bento box 5 Opening 6 Flange part 7 Cleaning cover 9 Blast nozzle 10 Ice grain supply pipe 11 Nozzle drive mechanism 12 Discharge duct

Claims (1)

[Claims] Claim 1. An ice blast device for cleaning a valve box, which cleans a valve box such as a gate valve by force-feeding ice particles with pressurized air and spraying the ice particles from a blast nozzle. a cleaning cover that is seated on the opening of the valve box and closes the opening of the valve box; an ice grain supply pipe that has a blast nozzle connected to its tip and that passes through the cleaning cover and forcefully delivers ice grains to the blast nozzle; A nozzle drive mechanism is provided on the cover and drives the blast nozzle vertically and freely via the ice supply pipe, and a valve is provided on the cleaning cover to control the mist of ice particles injected into the valve box. An ice blast device for cleaning a valve box, characterized in that it is equipped with a mist discharge duct for discharging mist from the box.