JPH0132155B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remotely controlled hoist suitable for use in transporting radioactive waste containers and the like in nuclear facilities.

In general industry, when cargo is transported by crane, the cargo can be seen visually and workers can directly attach and remove the cargo from the crane's slings, but this is different in nuclear facilities where radioactive materials are handled. Containers, etc. cannot be seen visually, and workers cannot directly perform these tasks due to radioactivity.

If a crane is to be used to transport cargo at a nuclear power facility, a lifting device that can automatically or remotely grasp and release the cargo is required.

Conventional automatic lifting devices include a hanging mechanism (Special Publication No. 1707, 1973) that can lift and suspend cargo in vertical aisles, and a device that lifts and transports rimmed containers such as Dorla cans. (Japanese Unexamined Patent Publication No. 55-89184), and as a remote-controlled lifting device, a gripping device that grips, releases, lifts, and suspends nuclear reactor fuel etc. by remote control. There is a device (Japanese Unexamined Patent Publication No. 157962/1983).

However, such an automatic hanging device cannot be used in the above-mentioned facilities because there is no method for checking whether the suspended load is attached or removed and no means for avoiding malfunction.

In addition, with the above-mentioned remote-controlled hanging device, there is a risk that the load may fall due to an erroneous operation while it is being hung, and its reliability and safety are insufficient.

An object of the present invention is to provide a remote-controlled hoist with excellent reliability and safety by including an interlock mechanism to prevent a hoisted load from falling due to malfunction. The main body of the hanging device is suspended from the main wire rope, and the engaging claw for hooking the suspended load is rotatably provided on the main wire rope, while the operating rod for rotating the engaging claw is inside the main body. An auxiliary wire rope is inserted so as to be movable up and down, and is connected to the operating rod to engage and disconnect the engaging claw by pulling up the operating lever, and also engages and releases the connecting claw when a suspended load is suspended. As an interlock mechanism for preventing this, a blocking claw that can be caught on the engaging claw and a spring that biases the blocking claw in the direction of catching on the engaging claw are provided. A support rod is interposed between the suspension body and the support, and a spring is compressed by the load of the suspended load and presses down the support rod against the load of the suspension body and the compressive force of the spring. The present invention is characterized by providing a link mechanism interposed between the support rod and pushed down in conjunction with the support rod to separate the blocking pawl from the engaging pawl.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The remote-controlled hanging device of the present invention will be described in detail below based on examples.

The remote-controlled hoist of the present invention has an interlock mechanism to prevent the suspended load from falling due to malfunction.Furthermore, in the embodiment shown in FIG. The load is released and the hanging device is supported by an auxiliary wire rope to prevent the lifting device from falling.

That is, the hanging main body 3 is suspended from the main wire rope 1 via a tubular support rod 2, which is fitted into the supporting rod 2 so as to be movable up and down a certain distance, and its upper end is connected to the main wire rope 1. It protrudes upward from the main body 3, while its lower end protrudes laterally and is adapted to engage with the main body 3. Further, a spring 9 is interposed in the space formed between the suspender main body 3 and the support rod 2 to push down the support rod 2. This spring 9
When the support rod 2 is compressed by the load of the suspended load and moves upward, an interlock mechanism, which will be described later, is activated to prevent the suspended load from falling due to erroneous operation. Further, this spring 9 has a compressive strength that cannot be compressed by the weight of the hanging tool main body 3.

On the other hand, an engaging pawl 4 for hooking a suspended load is pivotally attached to the lower part of the hanging tool main body 3 by a pin 5. At the lower part of the engaging claw 4, an engaging part for hanging a load is formed, and at the upper part, a tip 4a for interlocking is formed, and furthermore, a protrusion for operation is provided on the inner side thereof. Since the center of gravity of this engaging claw 4 is eccentric from the pin 5, it rotates under its own weight and becomes in a state where it can automatically hook a suspended load, but it is forced to rotate by providing a spring 16 or the like. Also good. On the other hand, an operating rod 13 having a locking portion for rotating the engaging claw 4 left and right in the figure is inserted into the support rod 2 so as to be vertically movable. Furthermore, an operating tube 12 connected to a sub wire rope 11 is fitted to the upper outer periphery of the support rod 2 protruding from the upper part of the hanging main body 3, and these operation tubes 12 and the operation rod 13 are connected to the support rod 2. They are connected via a pin 14 that passes through a long hole drilled in 2. Therefore, by remotely controlling the auxiliary wire rope 11 and moving the operation tube 12 and the operation rod 13 up and down, the engagement claw 4 can be rotated from side to side in the figure, and therefore the engagement claw 4 can be easily engaged and removed. I'm starting to be able to do it. A spring 15 that presses down the operating rod 13 is interposed between the operating rod 13 and the suspender main body 3. Further, in the present invention, an interlock mechanism is provided to prevent rotation of the engaging pawl 4. That is, the blocking claw 6 that engages with the upper tip 4a of the engaging claw 4 is pivotally attached to the main body 3 by a pin 8 at its center. The rear end of this blocking claw 6 is connected to a link 7 that comes into contact with the support rod 2, and the blocking claw 6
A spring 1 that presses the tip of the spring 1 against the tip 4a of the engagement claw 4
0 is set. Therefore, when the support rod 2 moves upward, the blocking claw 6 rotates due to the bias of the spring 9, and its tip catches on the tip 4a of the engaging claw 4.
The engagement/disengagement operation of the engaging claw 4 is prevented. Conversely, when the support rod 2 moves downward, the link 7 is pushed down, the blocking claw 6 rotates in the opposite direction to the above, and its tip separates from the tip 4a of the engaging claw 4, and the engaging claw 4 automatically locks the pin. It rotates around 5 and becomes ready to hang a suspended load.

A method of using the remote-controlled hanger of the present invention having the above configuration will be described next. When attaching the hanging load 17, first, the main wire rope 1 and the sub wire rope 11 are unwound synchronously, and the bottom part 3 of the main body 3 is lowered.
a to reach the engaging portion 17a of the hanging load 17.

Even after reaching the point, the sub wire rope 11 continues to unwind, and the operating rod 1 is lowered by the pressing force of the spring 15 and its own weight.
3 is lowered to rotate the engagement claw 4, the engagement claw 4 is hooked onto the engagement portion 17a. In other words, the first
The state is changed from the right half of the figure to the left half of the figure.
Thereafter, the main and auxiliary wire ropes 1 and 11 are synchronously wound up while the auxiliary wire rope 11 is slackened to some extent. Then, the support rod 2 is pulled upward, the lower end of the support rod 2 engages with the main body 3 against the spring force of the spring 9, and after the blocking claw 6 interlocks the engagement claw 4, the suspended load 17 is It can be lifted together with the lifting tool while still engaged.

Therefore, even if you accidentally operate the sub wire rope 11 during subsequent transportation and try to hook and release the engaging claw 4, the engaging claw 4 will be interlocked and will not rotate, which will prevent malfunction and prevent the suspended load. 17 will not fall. When transporting the suspended load 17 to the destination and lowering it, the main and auxiliary wire ropes 1 and 11 are synchronously unwound to allow the suspended load 17 to land on the floor. After landing on the floor, unwinding of the main and sub wire ropes 1 and 11 is stopped. Then, the support rod 2 moves downward due to its own weight and the pressing force of the spring 9, pushing down the link 7, the blocking claw 6 and the tip 4a of the engaging claw 4 are disengaged, and the interlock state of the engaging claw 4 is released. Ru. Next, pull up the auxiliary wire rope 11 to lift the operating rod 13, and rotate the engaging claw 4 inward to return it to the state shown in the right half of FIG. 1. In this state, main and sub wire ropes 1 and 11
If they are hoisted synchronously, the hoisting tool will detach from the hoisting load 17.

As described above, in the remote-controlled hanging device of the present invention, the interlock mechanism prevents malfunction during transportation of the suspended load, and there is no risk of the suspended load falling.

Further, the remote-controlled hoist having the above structure is designed so that when the main wire rope 1 breaks during the transportation of a suspended load, only the suspended load 17 falls, and the hoist itself is supported by the auxiliary wire rope 11 to prevent it from falling. That is, when the main wire rope 1 breaks, no load acts between the support rod 2 and the main body 3, the support rod 2 is immediately pushed downward by the spring 9, and the blocking claw 6 and the engaging claw 4 are engaged. The interlock state will be released. When the hanging device whose interlock condition has been released and the hanging load 17 fall and become stuck together, tension is applied to the auxiliary wire rope 11 which is always slackened, the operating rod 13 is pulled, and the engaging claw 4 is pulled. It's off. Therefore, only the suspended load 17 falls, and the hanging tool is supported by the auxiliary wire rope 11. That is, the main wire rope 1
As soon as the interlock is broken, the interlock state is released, and the engagement claw 4 and the suspended load 17 are disengaged the next moment. In this way, even if the main wire rope 1 breaks, the hanging tool will not fall, so the effort to recover the dropped hanging tool can be saved.

Next, the drive mechanism for the main and sub wire ropes 1, 11 shown in FIGS. 2 to 4 will be explained. As illustrated, the main drum 21 around which the main wire rope 1 is wound and the auxiliary drum 22 around which the auxiliary wire rope is wound are coaxially arranged. One end of the shaft 26 of the main drum 21 is connected to the electric motor 24 and the speed reducer 2.
5, and the other end of the shaft 26 is inserted into the sub-drum 22. A bearing 27 is fitted between the sub-drum 22 and the shaft 26, and an arcuate groove 22a is carved in the end surface of the sub-drum 22 facing the main drum 21, and a torque transmission pin protrudes from the main drum 21. 23 is inserted into the arc groove 22a. Therefore, when the main drum 21 is rotated, the sub-drum 22 is rotated with a delay of a certain rotation angle. Furthermore, a shaft 35 protrudes from the other end surface of the auxiliary drum 22, and the shaft 35 is connected to an auxiliary electric motor 31 and a reduction gear 32 via a torque limiter 34 and a clutch 33.

The procedure for operating the remote-controlled hanger of the present invention using the drive mechanism as described above will be described.

When attaching the suspended load 17 in the state shown in the right half of FIG. Pull up. Thereafter, the main drum 21 and the sub-drum 22 are rotated by the electric motor 24, and the hanging tool is suspended onto the suspended load 17. Next, the rotation of the electric motor 24 is stopped, and the clutch 33 is
The driving force of the sub-drum 22 is released by cutting. Then, the sub-drum 22 rotates within the range of the arcuate groove 22a, and the operating rod 13 lowers and the engaging claw 4 engages the suspended load 1.
It is caught on the engaging claw 17a of No.7. Continue with electric motor 2
4, the main and sub-drums 21 and 22 are rotated to lift the hanging load 17. Moreover, if the above-mentioned procedure is performed in reverse, the hanging load 17 can be suspended.

As described above in detail based on the embodiments, the remote-controlled hanging tool of the present invention has excellent reliability and stability without the risk of the suspended load falling due to malfunction during conveyance of the suspended load.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the remote-controlled hanging device of the present invention (the right half shows the state in which the engaging claws are engaged and unlatched, and the left half shows the state in which the engaging claws are interlocked). 2 is a plan view of a drive device for a remote-controlled hanging device of the present invention, FIG. 3 is a perspective view of a portion of the drive device, and FIG. 4 is a partial cross-sectional view of a sub-drum. In the drawing, 1 is the main wire rope, 2 is the support rod, 3
is the hanging tool body, 4 is the engaging claw, 5, 8, 14 are the pins,
6 is a blocking claw, 7 is a link, 9, 10, 15, 16
11 is a sub wire rope, 12 is an operating tube,
13 is an operating rod, and 17 is a suspended load.

Claims (1)

[Claims] 1. The main body of the hanging device is suspended from the main wire rope, and an engaging claw for hooking a suspended load is rotatably provided on the main body of the lifting device, while an operating rod for rotating the engaging claw is provided in the main body. An auxiliary wire rope is inserted so as to be movable up and down and is connected to the operating rod, and operates to engage and disengage the engaging claw by pulling up the operating rod;
Also, as an interlock mechanism that prevents the coupling claw from being engaged or removed when a suspended load is suspended, a blocking claw that can be caught on the engaging claw and the blocking claw is biased in a direction in which it is caught on the engaging claw. A spring is provided, and a support rod is interposed between the main wire rope and the suspension main body, and is compressed by the load of the suspended load, and resists the load of the suspension main body and the compressive force of the spring. interposing a spring between the suspension main body and the support rod to push down the support rod;
The remote-controlled hanging tool further includes a link mechanism that is pushed down in conjunction with the support rod to separate the blocking claw from the engaging claw.