JPH058997A - Elevatable device - Google Patents

Abstract

PURPOSE:To provide a compact elevatable device capable of vertically elevating attachments of an inspection device and the like up to a high altitude position. CONSTITUTION:The elevatable device is constituted by telescopically joining together a plurality of expansion tubes 2-8, and provided with an expansion part 1 having a fitting base 12 for fitting attachments on the extreme end part, a supporting device 9 to vertically support the expansion part, a hose-like air bag 14 fed within the expansion part, a feed means 16 to feed the air bag, and a means 18 to supply air within the extreme end part of the air bag, and by feeding the air bag and supplying air within it, the expansion part can be vertically elongated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device used for inspection of high places in various plants such as nuclear power plants and thermal power plants.

[0002]

2. Description of the Related Art Generally, scaffolds are installed to perform inspections at high places in various plants such as power plants. However, it takes a lot of time to install and dismantle scaffolds. There is a need for a lifting device that lifts and lowers toward a predetermined inspection position.

As a lifting device for inspecting high places, a device using a telescopic (nested) telescopic mechanism has been conventionally considered. In general, a small-diameter expansion / contraction mechanism such as an automobile antenna is configured to be extended by feeding a coil spring inside an expansion / contraction tube having a minimum diameter.

However, the weight of the inspection device attached to the tip of the telescopic mechanism is 20 to 50 kg, and the vertical lifting height is 10 kg.
When the length is up to 30 m, the outer diameter of the coil spring fed inside becomes large, and the outer diameter of the maximum expansion tube also becomes large at 200 to 300 mm. In addition, the storage box for the coil spring with a length of 10 to 30 m is also very large, so depending on the inspection position, the storage box may not be able to be brought into a prescribed location, or there may be no installation space. ..

[0005]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a compact lifting device capable of vertically lifting an attachment such as an inspection device to a high position.

[0006]

In order to achieve the above object, the lifting device according to the present invention comprises a plurality of telescopic tubes combined in a telescopic manner, and a mounting base for mounting an attachment is provided at a tip end portion thereof. And a supporting device for vertically supporting the expanding and contracting portion, a hose-shaped air bag to be fed inside the expanding and contracting tube having the smallest diameter of the expanding and contracting portion, and for supplying the air bag. And a means for supplying air into the tip portion of the air bag.

[0007]

In the above structure, the air bag is fed to the inside of the telescopic portion, and at the same time, air is supplied to the air bag to inflate the air bag from the tip end side thereof, thereby sequentially lifting the telescopic tube of the telescopic portion. Therefore, the weight of the inspection device and the weight of the expansion / contraction part are sufficiently supported by the air pressure in the air bag.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the lifting device according to the present invention will be described in detail below with reference to FIGS.

In the figure, reference numeral 1 is a plurality of expansion tubes 2, 3,
It is an expansion / contraction section formed by combining 4, 5, 6, 7, and 8 in a telescopic shape, and an expansion tube 2 having the maximum diameter is fixed by a support device 9 so as to expand and contract in the vertical direction. Each expansion tube 2
8 to 8 adopt lightweight and high-strength materials to reduce the wall thickness of each to the minimum necessary and minimize the difference in diameter between the minimum diameter pipe 8 and the maximum diameter pipe 2. In order to prevent the inner expansion tube from extending beyond a certain height with respect to the outer expansion tube adjacent thereto, as shown in FIG.
A projection 10 that projects radially outward is provided on the lower side of 8, and a projection 11 that projects radially inward is provided on the upper side. Further, the lower protrusion 10 is elongated in the axial direction, and this is for holding the telescopic tube vertically during extension. A mounting base 12 for mounting an inspection device (not shown) is fixed to the upper part of the expandable tube 8 having the smallest diameter by screws or the like.

The central part of the expansion / contraction part 1, that is, the expansion / contraction tube 8 having the smallest diameter.
A hose-shaped air bag 14 that extends from the take-up reel 13 through the support device 9 is disposed inside. Air bag 1
As will be understood from the following description, since a considerable pressure is applied to No. 4, a material having excellent pressure resistance such as a fire hose is preferable. Further, the diameter of the horizontal cross section of the air bag 14 when inflated is formed to match the inner diameter of the expansion tube 8. The air bag 14 is wound around a take-up reel 13, and is guided in a flat state between a plurality of pairs of guide rollers 15 of the supporting device 9 during use, and is guided into the expandable portion 1 by a pair of feeding rollers 16. It is supposed to be delivered. Although not shown, the support shaft 17 of the feeding roller 16 is connected to an electric motor via a transmission mechanism such as a gear.

The air bag 14 is inflated by supplying air to the portion beyond the feeding roller 16, and as a means for this, an air supply pipe 18 is arranged over the entire length of the air bag 14 in the illustrated embodiment. .. The air supply pipe 18 is fixed at a certain position of the air bag 14 with a tacho thread or the like so as not to be crushed between the feeding rollers 16 and fitted into the circumferential groove 19 of the feeding rollers 16, as shown in FIG. Have been combined. An air blowing nozzle 20 is attached to the tip of the air supply pipe 18, and air is blown into the air bag 14 from a lower opening 21 thereof. The upper end of the air bag 14 is wrapped around the upper end of the air blowing nozzle 20. In the figure, the air bladder 14 is an air blowing nozzle 20.
Although it is directly fixed to the air bag 14, it is preferable to fix it via a coil spring or rubber which expands / contracts appropriately so as to be able to follow the change in length due to the expansion of the air bag 14. The end of the air supply pipe 18 is the air intake pipe 2 of the take-up reel 13.
2 and the air intake pipe 22 is connected to a compressed air supply source (not shown) such as a compressor. Since the end of the air supply pipe 18 rotates with respect to the air intake pipe 22, a seal member such as an O-ring is built in the rotating portion of the take-up reel 13.

The operation of the lifting device 30 according to the present invention having such a structure will be described below.

The air bag 14 is flat when wound on the take-up reel 13 and can be stored compactly. In this flat state, the air bladder 14 is guided by the guide roller 15 of the supporting device 9 and guided between the feeding rollers 16 into the expandable tube 2 having the smallest diameter of the expandable part 1.

Here, the air intake tube 2 of the take-up reel 13
When compressed air is sent from the air bag 2, the air passes through the air supply pipe 18 and the air bag 14 from the opening 21 of the air blowing nozzle 20.
Sent in. Since the opening 21 of the air blowing nozzle 20 is at the tip of the air bladder 14, the air is fed by the feeding roller 16
Fills only the part that has passed. This state is the state shown in FIG. Reference numeral 28 is an air bag guide, and the air bag 1
This is to prevent the air bag 4 from being caught by the rotating feed roller 16 and to keep the air bag 14 in a constant inflated shape.

Further, when air is supplied to inflate the air bladder 14 and the feeding roller 16 is rotated to send out the air bladder 14, the expandable tubes 2 to 8 sequentially extend vertically upward. FIG. 2 shows a state in which the expansion tubes 3 to 8 inside the expansion tube 2 having the maximum diameter extend by one stage. The once expanded / contracted portion 1 is supported by the internal air bladder 14 like a pneumatic cylinder, so that the inspection device (not shown) fixed to the mounting base 12 can be securely held. By thus feeding the air bag 14 and feeding air into the air bag 14, the inspection device can be raised to a predetermined height.

When lowering the inspection device, the procedure may be reversed. However, if the air intake tube 22 is opened, the inside of the air bag 14 will be affected by the weight of the telescopic part 1 and the weight of the inspection device. Since the air is discharged to the outside through the air blowing nozzle 20, the air supply pipe 18 and the air intake pipe 22, the expansion / contraction unit 1 can be set to 1 by rotating the feeding roller 16 in the reverse direction.
It contracts step by step.

In the above embodiment, the lifting device 30 according to the present invention is used to lift and lower the inspection device for inspecting high places, but an attachment such as a remotely controllable welding machine is attached to the mounting base 12. You may use it. Further, the number and shape of the expansion tubes are not limited to those in the illustrated embodiment.

[0018]

As described above, by using the lifting device according to the present invention, it is possible to check various plants at high altitudes.
Alternatively, welding and maintenance at high places can be facilitated, which greatly contributes to the improvement of reliability of large structures. Further, scaffold assembly work is omitted, and safety and work efficiency are improved.

Further, since the air bag can be stored in a flat state and the diameter of the air bag when inflated can be reduced to reduce the diameter of the expansion / contraction portion, the entire apparatus can be made compact. It becomes possible and the applicable range is expanded.

[Brief description of drawings]

FIG. 1 is a side view showing an elevating device according to the present invention, and is a view showing a state in which a telescopic unit is in a contracted state.

FIG. 2 is a side view showing an elevating device according to the present invention, and is a view showing a state in which a telescopic unit is extended by one stage.

FIG. 3 is an enlarged cross-sectional view partially showing a stretchable portion.

FIG. 4 is a cross-sectional view showing a feeding roller and an air bag.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Expansion-contraction part 2-8 Expansion-contraction pipe 9 Support device 13 Winding reel 14 Air bag 16 Feeding roller 18 Air supply pipe 30 Lifting device

Front page continuation (72) Inventor Hiroshi Shimoyama 2-1-1 Niihama, Arai-cho, Takasago-shi, Hyogo Mitsubishi Heavy Industries Ltd. Takasago Laboratory

Claims (1)

Claim: What is claimed is: 1. A telescopic part comprising a plurality of telescopic tubes combined in a telescopic shape, and a telescopic part having a mounting base for attaching an attachment at its tip, and the telescopic part being perpendicular to each other. A support device for supporting, a hose-shaped air bag to be fed inside the expansion tube having the smallest diameter of the expansion part, a feeding means for feeding the air bag, and an inside of the tip part of the air bag. And a means for supplying air to the lifting device.