JPH0242703Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a lifting mechanism for a cage that carries a worker and moves it up and down inside a pit.

[Problems to be solved by this idea]

Conventionally, the usual method for raising and lowering workers into a pit is to use a ladder, a gondola, an elevator, etc. However, in special environments, such as inside a nuclear reactor cavity, it is necessary to move the robot up and down quickly and safely in order to reduce exposure to radiation and contamination. Furthermore, the functional surface of the cavity cannot be damaged by contact with walls or floors.

From these reasons, the conventional monkey ladder, gondola,
Currently, elevators and the like cannot be used for lifting and lowering workers under the above-mentioned special environment.

In other words, the monkey ladder has problems with safety and speed.
Furthermore, when the gondola is raised and lowered, the wire rope for raising and lowering is endless, so the wire rope hangs down from the upper frame and may hit the cavity wall. Furthermore, since the gondola cage does not have a steady rest, the swing causes contact with the cavity wall. A cushion is generally provided for this purpose, but it is not desirable to bring the cushion into contact when considering the function of the reactor cavity.

In an elevator, since the elevator car moves up and down along the guide rail, the guide rail must be fixed to the cavity wall by some method. Therefore, there is a method of permanently installing a guide rail holder on the cavity wall and installing the guide rail each time the elevator is used, or a method of permanently installing the guide rail on the cavity wall, but in either case, processing work must be performed on the cavity wall. Necessary and undesirable. Furthermore, it is possible to attach a suction cup to the guide rail so that the guide rail can be attached to the cavity wall, but this poses problems such as the possibility of damaging the cavity wall after several uses and the time required for installation.

This idea was devised in consideration of the above-mentioned circumstances, and its purpose was to allow workers to move up and down safely and quickly without contacting or damaging the cavity walls or floors, and to be compact and short in installation time. The object of the present invention is to provide a mechanism for raising and lowering a cage.

[Means for solving problems]

According to this invention, a shuttle base is provided on a traveling trolley that runs on the ground above the pit, and a lift cage for workers that can be raised and lowered by a lifting drive mechanism is attached to the lower end of a telescopic guide mast, and the cage is moved along the inner wall of the pit. The construction allows for the lifting cage for workers to be raised and lowered easily and quickly at any location by moving the traveling trolley, without the need for installing special guide members. .

〔Example〕

This invention will be explained below with reference to a preferred embodiment shown in the drawings.

The elevating mechanism 1 is mounted on a shuttle base 3 that can move forward and backward on a traveling trolley 2, and includes an elevating guide mast 5 that is telescopically telescopic and the shuttle base 3.
It is suspended by an elevating drive mechanism 6 provided in the mast 5, and is also fixed to the lower end of the mast 5, and consists of an elevating cage 7 for workers that moves up and down using the mast 5 as a guide member. .
(Refer to FIGS. 1 to 3) Here, reference numeral 8 is an operation box, and 9 is a platform for getting on and off the operator.

The traveling truck 2 is provided with a slideable shuttle base 3 on which a base 5a of a guide mast 5 having a drive mechanism 6 at its upper end stands upright, and a counterweight 10. Further, a removable fixing device 11, which is a locking mechanism, is provided at the end of the counterweight.

The lifting guide mast 5 is composed of a telescopic mast in which a plurality of stages of moving masts 5b are housed in a base 5a.
A lift cage 7 is fixed to the lower end of b'.

With the elevating mechanism 1 having such a configuration,
For example, in order to raise and lower a worker into the reactor cavity 13, the lifting mechanism 1 is first made to run on its own using a traveling cart 2. And with the removable fixing device 11,
The traveling carriage 2 is locked and fixed to the anchor 14.
(See FIG. 5) Next, the shuttle base 3 is slidably advanced on the traveling carriage 2 manually or electrically, so that the elevator cage 7 for the worker is extended from the cavity end 13a. (See Figures 4 and 1) Next, the worker uses the platform 9 to lift the elevator cage 7.
Go inside and operate the operation box 8 to open the drive mechanism 6.
is activated to let out the lifting rope 15, thereby lowering the lifting cage 7. (See FIG. 6) At this time, the elevator cage 7 is guided and supported by the elevator guide mast 5, which extends simultaneously with the lowering operation of the elevator cage 7, so that swinging is prevented and a stable lowering operation can be performed.

When raising the worker, perform the opposite operation. Also, when moving the lifting device 1 to another location, the shuttle base 3 is retreated into the traveling trolley 2,
This is done by removing the removable fixing device 11 from the anchor 14.

[Effects of the invention] Since the lifting cage for the worker is attached to the lower end of the lifting guide mast that can be raised and lowered by the lifting drive mechanism, the lifting guide mast also expands and contracts when the lifting cage for the worker goes up and down. Will follow.

Therefore, when the elevator cage is raised and lowered, it is guided by the guide mast, so that it can be raised and lowered stably without shaking.

By mounting the elevating drive mechanism and the elevating guide mast on the shuttle base that moves back and forth on the traveling vehicle, the worker elevator cage can be raised and lowered by simply advancing the shuttle base out of the traveling vehicle at any position.

Therefore, there is no need to install a special device for protruding and fixing the worker's elevating cage at the elevating and lowering work position, unlike in the past, and the elevating and lowering work can be performed easily.

The lifting and lowering work of the above-mentioned lift cage for workers can be carried out in a short time without the need to install a new device.

This means that, for example, inside a nuclear reactor cavity, it is necessary to raise and lower it quickly and safely in order to reduce radiation exposure contamination, etc., and it is also necessary to move the cavity up and down quickly and safely, which may cause damage from contact with the functional side of the cavity to the walls or floor. This is extremely effective when used in special environments where there are restrictions such as the inability to

[Brief explanation of drawings]

Fig. 1 is a front view showing the elevating mechanism of this invention in a state where it is set to enable elevating and lowering operations, Fig. 2 is a view taken along the line A-A in Fig. 1, and Fig. 3 is a view taken from B--B in Fig. 1. B
Figure 4 is a view taken along the line C--C in Figure 2, Figure 5 is an operational explanatory diagram showing the lifting mechanism set in the working position, Figure 6 is a diagram showing the lifting cage for workers. It is an operation explanatory diagram showing a lowered state. DESCRIPTION OF SYMBOLS 1... Elevating mechanism, 2... Traveling truck, 3... Shuttle stand, 5... Elevating guide mast, 5a... Base, 5b, 5b'... Moving mast, 6... Elevating drive mechanism, 7... Elevating Cage, 8...operation box,
9... Platform for workers, 10... Counter weight, 11... Removable fixing device, 13... Reactor cavity, 13a... Cavity end, 14...
Anchor, 15... Rope for lifting.

Claims (1)

[Scope of utility model registration request] A traveling truck that runs on the ground above the pit, a telescopic lifting guide mast installed on a shuttle base mounted on the traveling truck so as to be able to move forward and backward, and a lift guide mast that is fixed to the lower end of the guide mast and drives the elevator up and down. An elevating mechanism for an elevating cage for workers, comprising: an elevating cage for workers that can be freely raised and lowered into the pit along the inner wall of the pit by a mechanism.