JPH07163960A - Method for scouring upper semisphere of spherical tank and device therefor - Google Patents

Abstract

PURPOSE:To effectively and surely scour an upper semisphere having no obstacles of a spherical tank. CONSTITUTION:A scouring device 10 is provided with a water jet scourer 14 which is movable along an arc-like rack rail 12 along the longitudinal direction of the outer surface of an upper semisphere having no obstacles of a spherical tank 1, and is movable lengthwise and breadthwise in contact with the outer surface of the upper semisphere of the spherical tank 1. The scouring device 10 is movably and in the longitudinal direction installed in an existing arc-like moving scaffold 5 which is hung from an existing turning device 4 formed on the top of the spherical tank 1 and is movable breadthwise in contact with the outer surface of the upper semisphere of the spherical tank 1. In this way, by the lengthwise movement along the rack rail 12 of the water jet scourer 14 and the breadthwise movement of the scouring device 10 accompanying the breadthwise movement of the moving scaffold, a transverse scouring round with a longitudinal width A is made, and then, the scouring device 10 is moved in the longitudinal direction along the moving scaffold 5 to similarly make a transverse scouring round followed by the scoured surface. The operation is repeated in order.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for polishing and cleaning the outer surface of a hemispherical upper surface of a spherical tank for inspecting a spherical tank for storing gas or the like or as a surface treatment for coating.

[0002]

2. Description of the Related Art Conventionally, for cleaning and polishing the outer surface of a spherical tank, a manual cleaning method in which an operator rides on a mobile scaffolding work table and a method in which a self-propelled adsorption robot cleaning machine is remotely operated by a trained operator Another method is to use a hydraulic crane type telescopic arm to move the blast cleaner by a skilled operator.

[0003]

The manual blasting and cleaning by the operator is inefficient and inefficient, and when using a self-propelled adsorption robot, it is necessary to perform auxiliary suspension with a wire as a safety measure to prevent falling. This auxiliary suspension hinders freedom of movement, and when traveling on the seam line, the weight of the vacuum hose causes misalignment, which prevents smooth travel, and the vacuum hose is longer than 50 m. In that case, there is a problem that a large vacuum device is required and the device becomes large-scale and it is not profitable in cost, and it is difficult to move on the seam line even when moving by one crane type telescopic arm. There are difficulties, and in each case skilled operators are required to operate, and since these operators are limited, they are required. There was a problem difficult is.

The object of the present invention is to solve the above-mentioned conventional problems and to perform a complete and quick polishing by mechanically moving the upper and lower hemispheres of a spherical tank without obstruction mechanically in the vertical and horizontal directions. It is possible to clean and reduce the cost. In addition,
Since the lower hemisphere of the spherical tank has obstacles such as struts, it is cleaned by a method other than the present invention.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, the present invention is directed to an arc-shaped rack rail extending along the vertical direction on the outer surface of a spherical tank upper hemisphere, and a water movable vertically along the rack rail. Equipped with a jet blasting machine, a blasting device capable of moving vertically and horizontally in contact with the outer surface of the spherical tank upper hemisphere, suspended from a swivel device provided at the top of the spherical tank to contact the outer surface of the spherical tank upper hemisphere. Attached to the arcuate movable scaffolding that can move horizontally and vertically movable,
Vertical movement along the rack rail of the water jet blasting machine, and lateral movement of the blasting device with the lateral movement of the moving scaffolding, laps and sweeps the outer surface of the spherical tank upper hemisphere laterally with a predetermined width. Then, the polishing and sweeping method for the upper hemisphere of the spherical tank is performed by sequentially repeating the work of moving the polishing and sweeping device in the vertical direction and similarly similarly sweeping one round following the already polished surface.

Further, there is provided a polishing and sweeping device attached to an arcuate moving scaffold which is suspended from a turning device provided at the top of the spherical tank in contact with the outer surface of the upper hemisphere of the spherical tank and is movable laterally. At least two gate legs with free wheels in contact with the outer surface of the upper hemisphere of the spherical tank are arranged in parallel at the upper and lower ends of both legs at a distance above and below the horizontal member at the upper end of each gate leg. A rack rail having a rack on one side is formed in an arc shape along the outer surface of the spherical tank upper hemisphere, and the rack rail is provided with a plurality of free wheels that contact the outer surface of the spherical tank upper hemisphere, and a water jet polishing machine. This water jet blast cleaner is connected to and installed with the blast cleaner for running along the rack rails, and extends from each of the gate legs to one side and has a rolling wheel at the tip. Projecting the Doamu, for movably supporting the rolling wheel of the side arm in the vertical direction,
An arc-shaped guide rail along the outer surface of the spherical tank upper hemisphere is attached to the movable scaffold, and a pulling means is further attached to an upper end portion of the moving scaffold, and a wire of the pulling means is connected to an upper end of the rack rail. , Spherical tank upper hemisphere cleaning device.

[0007]

According to the method and apparatus of the present invention, the vertical and horizontal movements of the blasting device and the vertical movement of the water jet blasting device in the blasting device are all performed mechanically at a constant direction and speed. Therefore, even if it is difficult to move such as on the seam line, it is possible to accurately move in a fixed direction and perform complete and efficient cleaning.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a front view showing an embodiment of a method for polishing and cleaning a spherical tank upper hemisphere according to the present invention, and FIG. 2 is a side view of the same.
FIG. 3 is also an enlarged perspective view of the blasting and cleaning apparatus, and the present invention is a method and apparatus for automatically blasting and cleaning the upper hemisphere. In the figure, (1) is a spherical tank, and the lower hemisphere is Although there are multiple stanchions (2), the upper hemisphere is to be cleaned only with the manhole (3) at the top, and other obstacles such as sprinkling rings and spiral stairs are in the upper hemisphere. If there are some obstacles that cannot be removed, they will be removed, and only those parts will be cleaned up, and the remaining parts will be manually installed later.

(4) is a turning device, (5) is a mobile scaffold,
The swivel device (4) is provided at the position of the manhole (3) on the top of the spherical tank (1), and the moving scaffold (5) shown in phantom lines has wheels that contact the outer surface of the upper hemisphere of the spherical tank (1). It is formed in an arc shape, the upper end thereof is connected to the swivel device (4) and is suspended, and driven by the swivel device (4) to move the upper hemisphere of the spherical tank (1) laterally (swirl direction). The turning device (4) and the moving scaffold (5) are existing ones that have been widely used in the past.

Next, the blasting and cleaning apparatus, which is the main part of the present invention, will be described. The blasting device (10) is as shown in detail in FIG.
Free wheels (11
a) and (11a) having gate-shaped legs (11) and (11) arranged in parallel in the vertical direction, and the spherical tank (1) is provided below the horizontal member at the upper end of the gate-shaped legs (11) and (11). The rack rail (12) having a rack (12a) is attached to the lower surface by means of an attachment tool (13).

(14) is a water jet cleaner.
Spherical tank for ultra-high pressure water that has free wheels (14a) in contact with the outer peripheral surface of the spherical tank (1) at the four corners of the lower end and guide portions (14b) that movably engage with the rack rail (12) at the upper part. The outer peripheral surface is sprayed to clean the outer peripheral surface. (14c) is a water recovery hose, and (14d) is an air hose.

Reference numeral (15) is a grinding and sweeping machine, which is movably engaged with the rack rail (12) and is mounted on the rack (12).
It is equipped with a gear (not shown) that meshes with a) and a reduction motor (15a) that drives this gear, and is connected to the water jet blast cleaner (14). Drive the deceleration motor (15a) to drive the water-jet blast cleaner (1
4) and travel along the rack rail (12).
This running speed is reduced by the inverter
It is performed by controlling the rotation speed in a).

(16) is a side arm, which is a gate leg (1
It is attached to a lateral member at the upper end of 1) and protrudes laterally so that expansion and contraction can be adjusted, and a rolling wheel (16a) is provided at the tip.

The two gate-shaped legs (11) described above,
(11), the rack rail (12), the water jet blasting machine (14), the blasting machine (15), and the side arm (16) constitute a blasting machine (10).

Reference numeral (17) is a guide rail in which lip groove steel is formed in an arc shape along the outer peripheral surface of the spherical tank (1) and is attached to the side surface of the moving scaffold (5). The rolling wheel (16a) at the tip of the side arm (16) is fitted to the guide rail (17), and the blasting and cleaning device (10) vertically extends along the guide rail (17) along the outer surface of the upper hemisphere of the spherical tank (1). You can move in any direction.

(18) is a low speed winch (traction means),
Attached to the upper end of the moving scaffold (5), the wire (18a) of this low speed winch (18) is attached to the rack rail (1).
This wire (18a) is connected to the upper end of 2)
Two guide rollers (19) for supporting the midway are detachably attached to the moving scaffold (5). The guide roller (19) prevents the wire (18a) from coming into contact with the outer surface of the spherical tank (1), and the wire (18a) is prevented.
This is to prevent oil and the like adhering to the outer surface of the spherical tank from being contaminated.

With the above-mentioned structure, as shown in FIGS. 1 and 2, the water-jet polishing machine (10) is located at the lowermost end (almost maximum diameter portion) of the upper hemisphere of the spherical tank (1). (14) is driven, and the upper and lower gate legs (11), (1) along the rack rail (12) are driven by the cleaning and traveling machine (15).
After moving vertically between 1), the outer surface of the spherical tank (1) is vertically swept up and down by a length A, and then moved by the turning device (4). Laterally moved by the width of one line after grinding the scaffold (5). Then, similarly, straight-line grinding is performed in the vertical direction. The vertical straightening and sweeping operation is sequentially repeated to show the outer surface of the spherical tank (1) as shown in FIG.
Grind horizontally for the width (A) in the vertical direction as shown in FIG.

Next, the low speed winch (18) is driven to pull up the blasting device (10) along the guide rail (17) to a position where the vertical width (B) of FIG. The width (B) is swept horizontally for one round. In the same manner, the widths in the vertical direction are sequentially swept to (C), (D), (E), and (F) to complete the sweeping of the entire outer surface of the upper hemisphere. If the guide roller (19) gets in the way when the scavenging device (10) is pulled up by the wire (18a) and rises, a person should be able to remove this guide roller (19) on a moving scaffold. is there.

As a result of comparing the above-mentioned polishing and polishing by the apparatus and method of the present invention with the conventional manual polishing and cleaning, as compared with the polishing and cleaning ability of 0.3 m / min in the manual polishing and cleaning, 1.1 m / min according to the present invention. It has a scouring ability and is more than 3 times more efficient. Further, since the device has a relatively simple structure, it has an advantage that it can be easily assembled and disassembled on site.

[0020]

According to the method and apparatus for polishing and cleaning the upper hemisphere of the spherical tank according to the present invention described above, the vertical running along the rack rail of the water jet polishing machine in the polishing machine and this polishing machine are carried out. Attaching the sweeping device to the movable scaffolding that can be moved laterally (turning direction), which has been used conventionally, so that it can be moved up and down,
The vertical movement of the outer surface of the upper hemisphere of the spherical tank of the entire blasting machine and the horizontal movement along with the moving scaffolding are combined to carry out blasting, so that the outer surface of the upper sphere of the spherical tank can be horizontally swept by a predetermined width in the vertical direction. It becomes possible to polish the entire outer surface of the spherical tank upper hemisphere by sequentially stacking them in the vertical direction, and all the mechanical cleaning is mechanically forced to move. The movement is performed reliably, and even if there is a weld line or the like, the movement is not obstructed by the movement and no unetched portion remains, and complete polishing can be performed very efficiently. Further, since the structure of the device is relatively simple, assembly and disassembly on site can be facilitated and setup time can be shortened.

[Brief description of drawings]

FIG. 1 is a front view showing a state in which a polishing and cleaning device of the present invention is mounted on the outer surface of a spherical tank upper hemisphere.

FIG. 2 is a side view of the same.

FIG. 3 is an enlarged perspective view of a blast cleaning device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spherical tank 2 Struts 4 Swiveling device 5 Moving scaffolding 10 Sweeping device 11 Gate leg 11a Flexible wheel 12 Rack rail 12a Rack 14 Water jet polishing machine 14a Swivel wheel 15 Scavenging machine 16 Side arm 16a Rolling wheel 17 Guide rail 18 low speed winch (traction means) 18a wire

Claims (2)

[Claims] 1. A spherical tank rack hemispherical outer surface is provided with an arcuate rack rail extending along the longitudinal direction, and a water jet scouring machine movable vertically along the rack rail. A grinding and sweeping device that can move vertically and horizontally in contact with it is suspended from a turning device provided at the top of the spherical tank and moves vertically to an arc-shaped moving scaffold that can move laterally in contact with the outer surface of the upper hemisphere of the spherical tank. Attach as much as possible,
Vertical movement along the rack rail of the water jet blasting machine, and lateral movement of the blasting device with the lateral movement of the moving scaffolding, laps and sweeps the outer surface of the spherical tank upper hemisphere laterally with a predetermined width. Then, the polishing and sweeping method for the upper hemisphere of the spherical tank is characterized in that the polishing and sweeping device is moved in the vertical direction to sequentially repeat the polishing and sweeping for one round following the already polished and cleaned surface. 2. A polishing and sweeping device attached to an arcuate moving scaffold which is suspended from a turning device provided at the top of a spherical tank in contact with the outer surface of the upper hemisphere of the spherical tank and is movable in a lateral direction. At least two gate-shaped legs having free wheels attached to the outer surface of the upper hemisphere of the spherical tank are arranged in parallel at the upper and lower sides of the leg at both ends, and at the upper end of each gate-shaped leg below the lateral member. Attach a rack rail with a rack on one side in an arc shape along the outer surface of the spherical tank upper hemisphere,
A water jet polishing machine having a plurality of free wheels in contact with the outer surface of the spherical tank upper hemisphere on the rack rail; and a polishing machine for running the water jet polishing machine along the rack rail. For connecting sideways with each of the above-mentioned gate-shaped legs and projecting a side arm having a rolling wheel at one end extending to one side from the above-mentioned gate-shaped leg, and supporting the rolling wheel of the side arm so as to be vertically movable. An arc-shaped guide rail along the outer surface of the spherical tank upper hemisphere is attached to the moving scaffold, and a pulling means is attached to an upper end portion of the moving scaffold, and a wire of the pulling means is connected to an upper end of the rack rail. A hemispherical scavenging device for a spherical tank, which is characterized in that