JP2543828B2 - Membrane cleaning device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to clean color powder after inspection of welds of membrane material stretched on the side and bottom of the body of an underground storage tank, or to clean and clean residual water after water filling test. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, after the welding inspection of the side and bottom membranes stretched on the inner surface of the body of an underground storage tank, the cleaning work of the color powder is carried out by manual cleaning of the welded part or household cleaning. It was cleaned by suctioning it using a tool of the instrument level. In addition, regarding the removal of the excess penetrant liquid, a method has also been proposed in which a powder is sprayed to absorb the penetrant liquid and the powder is sucked and removed. (For example, see Japanese Patent Application No. 5-85525)

[0003]

SUMMARY OF THE INVENTION In the conventional cleaning means,
As mentioned above, most of the cleaning work has to rely on human power, so there is the inconvenience of requiring a lot of time and labor.
In particular, when cleaning the side membranes, work on the gondola was a problem in terms of workability and safety.

The object of the present invention is to automatically perform the cleaning work of the color powder after the welding inspection at the membrane welded portion by the cleaning means mounted on the frame, thereby making the work unmanned and significantly laborious. It is to reduce and improve cleaning efficiency.

[0005]

The structure of the present invention for solving the problems of the prior art has a vertical posture parallel to a side membrane suspended from a winch wire arranged above the body of an underground storage tank so as to be vertically movable. And a board on which a self-propelled means can obtain two horizontal attitudes for traveling on the upper surface of the bottom membrane, and a cylinder which is provided on the frame to allow the cylinder surface to move toward and away from the membrane surface, A sealing brush that is arranged around the outer periphery of this board and is longer than the height of the membrane corrugation to contact the membrane surface, and a length longer than the height of the membrane corrugation built in the closed space composed of the board and the sealing brush. Equipped with a cleaning means composed of a rotating brush of a length and suction and recovery means of the separated powder attached to the plate portion between the rotating brush and the sealing brush. And that a plurality of cleaning means are mounted on the frame body via a membrane welding line interval, the frame body is self-propelled in a direction orthogonal to the traveling direction thereof, and is orthogonal to the cleaning means. It is equipped with one or more cleaning means for testing the membrane welded part.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, details of embodiments of the present invention will be described with reference to the drawings. 1 is a general schematic sectional view of an underground storage tank, FIG. 2 is a partial perspective view of a side membrane, FIG. 3 is a front view of a cleaning device showing a cleaning operation of the side membrane, and FIG. 4 is a side view of the cleaning device in FIG. FIG. 5, FIG. 5 is a perspective view of the cleaning means, FIG. 6 is a partially cutaway front view of the cleaning means, FIG. 7 is an explanatory view showing a corrugation detection state of the limit switch, and FIG. 8 is a welding line cleaning range view of one cycle. FIG.

Reference numeral 1 shown in FIG. 1 is an underground storage tank, and a membrane 4 is stretched on the inner surface of a concrete skeleton 2 constituting the underground storage tank 1 with a cold insulating material 3 interposed therebetween.
The low temperature liquid 5 such as G and LPG is stored. Reference numeral 6 in the figure denotes a roof having a cold insulating material 3 stretched on its inner surface. The membrane 4 is stretched as shown in FIG.
Is a corrugation formed on the membrane 4, 8a is a vertical welding line between the membranes 4, 8b is a horizontal welding line between the membranes 4, and 9 is a membrane anchor. The present invention relates to a device for removing and cleaning color powder for development adhering to the welded portions after the color check or leak test of the welded line portions 8a and 8b of the stretched membrane 4 as described below. The details will be described with reference to FIGS.

3 and 4 are suspended on a hanging piece 11 of a wire 10 of a winch (not shown) arranged above the concrete skeleton 2 constituting the underground storage tank 1 and stretched on the inner surface of the side of the concrete skeleton 2. The cleaning device A is shown in a vertical posture that is suspended in parallel with the installed membrane 4. The details of the cleaning device A in the vertical posture will be described. 12 is
A main body incorporating a dust collecting box and a control system, and caterpillars 13 such as rubber which are self-propelled by a drive source (not shown) incorporated in the main body 12 are provided on the lower left and right sides of the main body 12,
The caterpillar 13 is rotatably in contact with the surface of the membrane 4 so that irregularities such as the corrugation 7 of the membrane 4 are absorbed. Also, the subject 1
2, a frame 14 is provided so as to project in the vertical direction of the paper surface, and each of the end portions of the frame 14 is connected to the central portion of an arm 15 which is parallel to the axle direction of the caterpillar 13 and has an expandable structure. Cleaning means B for the longitudinal welding lines 8a of the membranes 4 are provided at both ends of the respective. On the other hand, separately from the upper and lower frames 14, a long rack-shaped traverse rail 17 supported by frames 16 provided above and below the main body 12 and having an axis parallel to the axis of the arm 15 is provided. A pinion (not shown) that is driven by meshing with a rack 17a provided on the traverse rail 17
Each of the cleaning means C is capable of reciprocating through the same, and is provided with a cleaning means C for cleaning the lateral welding lines 8a of the membranes 4. The suspension pieces 11 are provided at two places on the left and right of the arm 15 above the plane of FIG. Further, the expansion and contraction adjustment of the arm 15 is performed by fixing with the stoppers 18 at the positions where the centers of the cleaning means B provided at both ends fit the welding lines 8a on both sides of the membrane 4, and the cleaning means C is also used.
Are set so as to fit the upper and lower welding lines 8b of the membrane 4. Also, the arm 1 which is the upper leading end of the suspension vertical posture or the traveling side by the caterpillar 13 in the horizontal posture
5, a limit switch 19 is provided in the center, and when the limit switch 19 comes into contact with the first corrugation 7 in the horizontal posture provided on the membrane 4, the driving of the winch or the caterpillar 13 is stopped. The cleaning means C operates along the traverse rail 17, and the cleaning device A is configured as described above.

Next, referring to FIGS. 5 and 6, the constructions of the cleaning means B and C, that is, the cleaning means B and C are different from each other only in that they are mounted with their phases shifted by 90 °. Now, the cleaning means B will be described. Two air cylinders 20 are provided on the bottom surfaces of both ends of the arm 15, that is, on the surface of the arm 15 that faces the stretched surface of the membrane 4, and the ends of the air cylinders 20 are formed in a rectangular shape such as an elliptical plane. Attached to the outer peripheral edge is a dust scattering prevention mechanism 23 comprising a board 22 in contact with the surface of the membrane 4 and surrounding a sealing brush 21 longer than the height of the corrugation 7 of the membrane 4, and this scattering prevention mechanism 23 A closed space 24 is formed between the board 22, the brush 21 for sealing, and the surface of the membrane 4. Further, a motor 25 is provided at the center of the upper surface of the disk 22, and a brush 27 that is in contact with the surface of the membrane 4 and is longer than the height of the corrugation 7 is provided on the outer peripheral edge of the disk 26 that is rotationally driven by the motor 25. A rotary brush 28 is built in the central portion of the closed space 24, and a vacuum nozzle 29 communicating with the closed space 24 is provided on one side of the board 22, and the dust collection which constitutes the vacuum nozzle 29 and the main body 12 is provided. A box (not shown) is connected by a dust collecting and collecting hose 30. In the figure, 31 is an air hose connected to a compressor (not shown) via a control system (not shown) of the main body 12, and 32 is an electric wire connected to the control system of the main body 12. The cleaning means B and C are configured as described above.

[0010]

[Explanation of Action] As shown in FIG. 2, the membrane 4 stretched on the inner surface of the concrete skeleton 2 with the cold insulating material 3 interposed therebetween has two parallel corrugations 7 in the central width.
The corrugation 7 is formed in the central part of the two parallel parallel corrugations 7 that are interrupted at right angles to the corrugation 7, that is, the corrugation 7 is formed in a cross shape in the central part of the plate surface, and the phase is changed by 90 °. The membrane 4 stretched in such a manner that it is alternately arranged in the vertical and horizontal directions and stretched.
The cleaning of the welding lines 8a and 8b will be described. Figure 3,
As shown in FIG. 4, the cleaning device A is connected to the winch wire 1
The limit switch 19 attached to the leading arm 15 is fitted between the two parallel corrugations 7 in the vertical posture formed on the membrane 4 while being suspended from 0. On the other hand, cleaning means B arranged at both ends of the arm 15
The respective air cylinders 20 are extended and pressed against the welding line 8a in the longitudinal direction of the membrane 4, and in this posture, the rotating brush 28 is rotated by the motor 25 to sweep up the powder in the welding line 8a to vacuum the dust. While continuing the work of suctioning from the nozzle 29 and collecting in the dust collecting box via the dust collecting and collecting hose 30, the cleaning device A slowly raises by the winch and cleans the welding line 8a portion by the upper and lower cleaning means B. At this time, the caterpillar 13 idles while contacting the surface of the membrane 4. When the limit switch 19 attached to the preceding arm 15 comes into contact with the first corrugation 7 in the horizontal posture of the upper membrane 4, as shown by the phantom line in FIG.
9 turns off. In response to this signal, the lifting of the cleaning device A by the winch is stopped, the drive of the rotating brush 28 of the cleaning means B is stopped, and at the same time, the cleaning is arranged vertically on the left end portion of both traverse rails 17 in the drawing. Means C
The air cylinder 20 extends to press the cleaning means C against the transverse welding line 8b of the membrane 4, and the motor 25 drives the rotary brush 28 to rotate.
The traverse rail 17 is operated by the action of the rack 17a and the pinion.
While moving to the right on the paper surface along the direction, the powder in the horizontal welding line 8b is swept up to remove the dust from the vacuum nozzle 29.
It is further sucked and collected in the dust collecting box through the dust collecting and collecting hose 30. When the cleaning means C reaches the right end of the transverse rail 17 on the paper surface, the cleaning means C reverses the rack 17a and the pinion, and the cleaning means C performs the finishing cleaning while performing the transverse cleaning.
At the left end of the paper surface, that is, at the time when the starting point is reached, the rotation brush 28 and the cleaning means C stop moving, and at the same time, the air cylinder 20 contracts and the pressing force of the cleaning means C on the membrane 4 is released. By this signal, the raising of the cleaning device A by the winch and the driving of the rotary brush 28 of the cleaning means B are restarted. Immediately after this restart, the limit switch 19 comes into contact with the upper corrugation 7 in the horizontal posture. However, the limit switch 19 is not operated by the timer circuit for the time period during which the upper corrugation 7 is passed. The winch does not stop even if it touches 7. While repeating the above operation, as shown in FIG. 8, after reaching the upper end of the side of the concrete skeleton 2 and cleaning the vertical and horizontal welding lines 8a, 8b for one cycle, the winch is moved for one cycle. After that, the wire 10 is unwound to lower the cleaning device A onto the bottom plate, and while cleaning device A is sequentially raised and stopped again, the work of cleaning the welding lines 8a and 8b of the cycle portion is performed on the concrete skeleton 2 side. This is done over the entire circumference of the section. Further, when cleaning the weld line portion of the membrane 4 stretched on the bottom, the cleaning device A is placed in a horizontal posture and the caterpillar 13 is driven, and the operation is the same as that described above. Is omitted. In addition to the cleaning of the welding line part, this device can be used for the bottom residual water treatment and cleaning work after the water filling test.

[0011]

As described above, according to the structure of the present invention, the following effects can be obtained. (A) Color check of side and bottom membranes, removal of color powder after ammonia test, and cleaning work are performed automatically by a winch ascending / descending operation or cleaning means of a cleaning device mounted on a self-propelled frame. Therefore, unmanned work can be achieved, and significant labor saving can be achieved. (B) In the conventional manual work, the worker may inhale the scattered powder, but due to the unmanned operation, it is not necessary to arrange a worker in the vicinity thereof, and the working environment is improved. (C) Since work on the gondola is eliminated particularly at the side membrane, workability and safety can be improved. (D) It can also be used for bottom residual water treatment and cleaning work after tank water filling inspection.

[Brief description of drawings]

FIG. 1 is a general schematic cross-sectional view of an underground storage tank.

FIG. 2 is a partial perspective view of a side membrane.

FIG. 3 is a front view of a cleaning device showing a side membrane cleaning operation.

FIG. 4 is a side view of the cleaning device in FIG.

FIG. 5 is a perspective view of cleaning means.

FIG. 6 is a partially cutaway front view of the cleaning means.

FIG. 7 is an explanatory diagram showing a corrugation detection state of a limit switch.

FIG. 8 is an explanatory diagram showing a welding line cleaning range for one cycle.

[Explanation of symbols]

 A Cleaning device B Cleaning means C Cleaning means 1 Underground storage tank 2 Concrete skeleton 3 Cooling material 4 Membrane 5 Low temperature liquid 6 Roof 7 Corrugation 8 Welding line 8a Welding line 8b Welding line 9 Membrane anchor 10 Wire 11 Hanging piece 12 Driving source 13 Track 14 Frame 15 Arm 16 Frame 17 Traverse Rail 17a Rack 18 Stopper 19 Limit Switch 20 Air Cylinder 21 Seal Brush 22 Disc 23 Scattering Prevention Mechanism 24 Closed Space 25 Motor 26 Disk 27 Brush 28 Rotating Brush 29 Vacuum Nozzle 30 Dust Collection Hose 31 Air hose 32 Electric wire

Claims (3)

(57) [Claims] 1. A vertical posture parallel to a side membrane suspended up and down by a winch wire arranged above a body of an underground storage tank, and a horizontal posture in which a self-propelled means travels on a top surface of a bottom membrane. In the frame body, which is designed to obtain the above, a disc that can be moved toward and away from the membrane surface by a cylinder provided in the frame body, and a plate that is surrounded by the outer periphery of the disc and is longer than the height of the membrane corrugation. A sealing brush that contacts the surface of the membrane, and a rotary brush that is longer than the height of the membrane corrugation built in the closed space formed by the board and the sealing brush,
A membrane cleaning device, comprising a cleaning means including suction means for sucking and collecting peeled powder attached to the plate portion between the rotating brush and the sealing brush. 2. The membrane cleaning device according to claim 1, wherein a plurality of cleaning means are mounted on the frame body with a space between the membrane welding lines interposed therebetween. 3. The frame is equipped with one or a plurality of cleaning means for self-propagating in a direction orthogonal to the traveling direction of the frame and cleaning a membrane welded portion orthogonal to the cleaning means. Or the membrane cleaning device according to 2.