JPS60155371A - Automatic polishing sweeper for internal surface of spherical tank - Google Patents

Abstract

PURPOSE:To stably move a point end nozzle device along the internal surface of a tank continually by fixed force so as to polish the internal surface of the tank to be uniformly swept, by mounting a truck to the end part of turning arms through a pantograph expansion link mechanism and setting the point end nozzle device to this truck. CONSTITUTION:A central post, being almost vertically further rotatably set on the diametric line of a spherical tank 1, liftably connects by a pin the root end of a pair of turning arms 11. A truck 18, being mounted to each end part of these turning arms 11 through a pantograph expansion link mechanism 19, sets a point end nozzle device 20 and approaches to an internal surface of the tank 1 by the action of this link mechanism 19, and the point end nozzle device 20, being brought into slide contact with the internal surface of the tank 1 holding a fixed distance and strength, easily further stably moves continually by fixed force along the internal surface of the tank 1 through the truck 18, thus uniformly polishing the internal surface of the tank 1 by short blast without causing unevenness.

Description

[Detailed Description of the Invention] The present invention relates to an automatic cleaning machine that cleans and polishes the inner wall surface of a large gas tank or other spherical tank to a state that enables non-destructive inspection of welded parts. , a spherical tank in which a vertical central column is rotated, a rotating arm connected with a pin to the central column is moved up and down, and the inner surface of the tank is polished by shot blasting using a tip nozzle device installed at the tip of the rotating arm. Concerning an automatic inner surface cleaning machine.

(Background Art) For example, the automatic sanding machine described in Japanese Patent Application No. 57-183488 has a structure in which a tip nozzle device is installed directly at the tip of a rotating arm, and the tip nozzle device slides into contact with the inner surface of a spherical tank. .

Therefore, there is a drawback that the tip of the rotating arm swings or there is a deviation in the vertical speed, and the polishing surface becomes uneven, making it impossible to obtain an average finish.

In addition, the barbed end nozzle device must be attached to the tip of the swivel arm with a pin joint and supported by an auxiliary link that forms a parallelogram link mechanism with the swivel arm, which has the disadvantage of complicating the configuration. there were.

(Object of the Invention) Therefore, the object of the present invention is to provide flexibility in the turning radius and the elevation radius of the swing arm and the tip nozzle device, and to maintain a constant distance between the tip nozzle device and the inner surface of the tank by using a cart. The sliding contact is strong, so even if the central support is erected slightly off-center, or the base end of the swing arm is in a position that is slightly off-center, the rotation and elevation movements are smooth and constant. To provide an automatic cleaning machine for the inner surface of a spherical tank which can perform cleaning using force, does not cause uneven cleaning due to vibration of the tip of a rotating arm or deviation in vertical speed, and has a simple configuration. There is a particular thing.

(Disclosure of the invention, effects) In order to achieve the above object, the automatic sanding machine of the present invention has the following features:
A truck is attached to the tip of the swing arm via a telescopic link mechanism, and a tip nozzle device is installed on the truck.

Therefore, changes in the turning radius and the elevation radius within certain limits can be appropriately coped with by expanding and contracting the telescopic link mechanism. In addition, as long as the cart is in contact with the tank's inner surface, the tip nozzle device will slide into contact with the tank's inner surface at a constant distance and strength!
- Shot blast polishing can be carried out well.

Moreover, the tip nozzle device can be easily and stably moved along the inner surface of the tank via the cart with constant force, so there is no swinging of the tip of the swing arm or deviation in vertical speed, and uneven grinding is avoided. , never happens.

Furthermore, an auxiliary link or the like for supporting the tip nozzle device is not required at all, and the configuration is simple.

By the way, the truck is made up of a frame curved with a curvature approximating the inner surface of a spherical tank, and wheels attached to both upper and lower ends of the frame, and the tip nozzle device is guided by the frame and moved in the vertical direction. It was installed and moved by a winch installed on a truck, and the telescoping link mechanism was configured to be expanded and contracted by an air cylinder, so so-called automatic operation was possible, and the tip nozzle device was moved on the truck. This makes it possible to clean every corner of the inside of the tank.

On the other hand, the upper end of the central column is supported via a pedestal fixed in contact with the outer periphery of the manhole in a spherical tank and a bearing attached to this pedestal, so the tank is filled with water and airtight. This makes it easier to open/close the manhole and open/seal it during the airtightness test to check the suitability of the manhole.

Next, the illustrated embodiment will be explained.

FIG. 1 shows a state in which an automatic cleaning machine is installed in a spherical tank 1 to be cleaned. By the way, this spherical tank 1
The inner diameter of the tube is 18 m.

In the figure, reference numeral 2 denotes a central support installed vertically on the diameter line within the spherical tank 1.

The upper end of the central column 2 is as shown in detail in FIG.
It has a rectangular tower structure, and is rotatable by a pedestal 4 whose four legs 4a are fixed in contact with the inner surface of a spherical tank 1, which is the outer peripheral part of the manhole 3, and a bearing 5 provided at the bottom of this pedestal 4. is supported by

Therefore, the cover of manhole 3 is a completely free entity,
Opening/closing or sealing operations during the airtight test can be performed independently and easily.

The lower end of the central column 2 is also rotatably supported within the spherical tank 1 by a tower-shaped pedestal 7 and a bearing 8 fixed directly above the lower manhole 6. Legs 7a of this pedestal 7 are also fixed in contact with the outer peripheral portion of the manhole 6. Therefore, the cover of the lower manhole 6 is also completely free, and can be opened, closed, and sealed at will.

The pedestal 7 is equipped with a rotary feed device 9 powered by a hydraulic motor or the like, which feeds the central column 2 at a speed of, for example, 1 hour per hour via a large gear 10 fixed to the lower end of the central column 2.
It rotates at the slow speed of a rotation.

The central support 2 is a support unit member 2 with a length of about 1.5m.
It is assembled by adding f, L... inside the tank. Therefore, there is no problem in carrying in or out through the lower manhole 6.

Next, reference numeral 11.11 in the figure indicates a pair of symmetrical and vertically movable units whose base ends are connected by a bottle 12 at a position corresponding to the spherical center of the spherical tank J in the central column 2 or in its vicinity. It is a rotating arm.

This swing arm 11.11' is assembled by adding unit members each having a length of about 1.5 m in a tank. Therefore, there is no problem in taking in and out through the manhole 6.

A bifurcated joint 13 is provided at the base end of each pivot arm 11.11'.
, 13' are attached, and are connected to the central column 2 via a single pin 12 via the joints 13, 13'.

In the figure, reference numeral 35.35 denotes a tension bar disposed parallel to the swing arms 11, 11', the base end of which is connected to the central column 2 through a pin 37, and the distal end connected to the vertical support frame 36 through a pin. This tension bar 35 is also assembled by adding unit members of a certain length.

As shown in FIG. 5, a movable support member 40 is attached to the tip of the swing arm 11 or 11' with a pin 39, and a vertical support frame 36 is attached to the movable support member 40 with a pin 41.

In the figure, 14 and 14' are winches installed near the tips of the rotating arms] 1 and 11' (see Figure 5), and the wires 15 and 15' of each are installed at the upper end of the central support 1. It is connected to the rear end 16. Each winch 14.1
4 is driven by a hydraulic motor or the like as a power source.

That is, each winch 14, 14' has a wire 15°1
When the wires 15 and 15' are loosened, the swing arms 11 and 11' extend upward, and when the wires 15 and 15' are loosened, the swing arms 1
．． 1 and 11 move downward. winch 14
．． 14 is stopped and locked, the vertical position of the swing arms 11° and 11' can be fixed.

In the figure, reference numerals 17 and 17' indicate a riding gondola provided at the tip of each swing arm 11 and 11', and 18 indicates the movable support member 40 (
(Fig. 5) is attached via a telescopic link machine st 9, 19'.
is installed. Details of these configurations are shown in Figures 3 and 4.
As shown in 1.

That is, the telescopic link mechanism 19 connects the two link members to
They are assembled in a letter shape, and their intersections are connected by a bottle 21, and are expanded and contracted by an air cylinder 22. This telescoping link mechanism 19 expands and contracts within a range of about 20 cm, and accordingly moves toward or away from the inner surface of the spherical tank 1 until the truck 18 and the tip nozzle device 2° are quenched with the inner surface of the spherical tank 1. Therefore, it is possible to follow changes in the turning radius and the elevation radius within the limits of the amount of expansion and contraction.

The truck 18 has a frame 18a having a framework structure, which is made up of a pair of channel steel curved with a curvature similar to the inner surface of the spherical tank 1, each facing inward and arranged in parallel in the vertical direction.
Wheels 18b, 18b that rotate freely at the upper and lower ends of
, D-shaped structure, and the substantially central portion of the frame 18a is connected to one end portion of the telescopic link mechanism 19.

The tip nozzle device 20 has a pair of support cars 2oa, 2oa provided symmetrically on the same center line on both sides thereof, and
It is fitted in a rolling manner into a groove of a channel steel forming the frame 18a of the frame 188, and is installed so as to be movable in parallel downwardly along the frame 188. On the other hand, a rain inch 23 with a built-in guard motor is installed at the upper end of the arene 18r1, and the tip of the wire 24 is connected to the tip nozzle device d20. When the winch 23 winds the wire 24, the tip nozzle device 2o moves upward along the frame 18a, and conversely, when the wire 24 is loosened, the tip nozzle device 2o moves downward. There is no possibility that the cart 18 gets stuck at the upper and lower ends of the spherical tank 1, and efficient cleaning and polishing can be performed to every corner.

The tip nozzle device 20 has a nozzle that strongly injects the shot fed from the blasting device 25 (FIG. 5) installed adjacent to it onto the inner surface of the spherical tank 1, and a nozzle that strongly injects the shot and the dust together. It has a seal rubber provided on the outer periphery of the injection port for recovery and a recovery port, and is designed to be as light and small as possible.

The cleaning width of the 9114 nozzle device 20 is usually 200~
300, the cleaning speed is 0.7rn/min to 1.0"
%min.

On the other hand, the blasting device 25 is comprised of a cyclone 29, a shot tank 30, etc., as shown in FIG. That is, the recovery port of the tip nozzle device 20 and the cyclone 29 are connected by a recovery hose 31, and the shot separated from the dust is stored in the shot tank 30.

6-7”/cm2 generated by the compressor outside the tank
The high-pressure air is supplied to the jet nozzle pipe 34 through the air hose 33, jets the jet that is supplied falling from the shot tank 30, and is supplied through the shot feed hose 35 connected to the injection nozzle of the tip nozzle loading 20. do.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a spherical tank equipped with an automatic sanding machine according to the present invention in use, Fig. 2 is a perspective view showing the support structure of the upper end of the central column, and Figs. 3 and 4 are An enlarged stop view of the tip nozzle device portion and a right (-+ij side view), Figure 5 is a detailed view of the tip of the swing arm and the blasting device. Figure 3

Claims (1)

[Claims] (11) A central column installed substantially perpendicularly on the diameter line of the spherical tank and rotatably; In an automatic cleaning device consisting of a rotating arm installed at An automatic cleaning machine for the inner surface of a spherical tank, characterized in that a tip nozzle device (E) is installed on the truck (G) and a tip nozzle device (E) is installed on the truck (G). (2. The trolley (g) described in claim 1 is
It is equipped with a frame (18a) curved with a curvature similar to the inner surface of the spherical tank (11), and the tip nozzle device (E) is movably installed while being guided by the frame (18a),
It is assumed that it is moved by a winch (2) installed on a trolley (to), and the telescopic link mechanism α field is an air cylinder)
Automatic cleaning machine for the inner surface of a spherical tank that expands and contracts. (3) The central column (2
) is attached to a pedestal (4) fixed to the outer periphery of the manhole (3) and a bearing (5) attached to this pedestal (41).
) Automatic cleaning of the inner surface of the spherical tank supported through.