JPS6323409Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a remote-controlled hoist suitable for use in transporting radioactive waste containers and the like in nuclear facilities.

In general industry, when cargo is transported using a crane, the cargo can be seen visually and workers can directly attach and remove the cargo from the crane's hanging equipment, but in nuclear facilities that handle radioactive materials, radioactive waste containers, etc. It is not visible to the naked eye, 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 a vertical passage; A lifting device used for transportation (Japanese Unexamined Patent Publication No. 55-89184), and a remote-controlled lifting device that grasps, releases, lifts, and hangs nuclear reactor fuel etc. by remote control. (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 stability are insufficient.

Therefore, an object of the present invention is to provide a highly reliable and safe remote-controlled hoist that prevents a hoisted load from falling due to malfunction.

The structure of the present invention that achieves this purpose is such that a spring is interposed between the suspension body and the suspension body so that the suspension can move freely up and down, and at the rising end, it is supported so that it abuts and becomes integral with the suspension body. At the same time as assembling the body, connect the main wire rope that suspends the lifting tool body to the support body via the support body, and connect the engaging pawl having the engaging part so that the engaging part engages with the suspended load side. The operating rod is pivotally attached to the lower part of the hanging tool main body so as to be rotatable and detachable, and the operating rod is attached to the lifting tool main body so as to be movable up and down with respect to the lifting tool main body and the support. A roller is provided that comes into contact with the engaging claw, and an auxiliary wire rope is further connected to the operating rod, and the engaging claw engages with the suspended load side when the roller and the engaging claw come into contact with each other as the operating lever moves up and down. Furthermore, the engaging claw is provided with an engaging part for interlocking, and when the engaging claw is engaged with the hanging load side, one end is engaged for interlocking by spring force. A blocking claw that locks the engaging claw by engaging with the hook is pivoted to the main body of the hanging tool, and the other end of the blocking claw faces the lower surface of the support, so that when the support is lowered, the blocking claw is attached to the support. Accordingly, the remote control hanging device is characterized in that the blocking pawl is rotated so that the one end portion is disengaged from the interlocking engagement portion.

Hereinafter, the remote-controlled hanging device of the present invention will be described in detail based on embodiments.

The remote-controlled lifting device of the present invention has an interlock mechanism that prevents the suspended load from falling due to malfunction.Furthermore, in the event that the main wire rope breaks, the suspended load can be immediately removed from the lifting device, and the lifting device is supported by a secondary wire rope to prevent the hanger from falling.

That is, a suspension body (hereinafter simply referred to as the body) 3 is suspended from the main wire rope 1 via a tubular support rod 2 as a support and a movable pulley 18, and the support rod 2 is attached to the main body 3 vertically. It is fitted so as to be movable over a certain distance, and its upper end projects upwardly from the main body 3, while its lower end projects laterally and is adapted to engage with the main body 3. Further, a spring 9 for pushing down the support rod 2 is interposed in the space formed between the main body 3 and the support rod 2. This spring 9 is compressed by the load of the suspended load 17, and the support rod 2 is
When the suspended load 17 is moved upward relative to the suspended load 17, an interlock mechanism, which will be described later, is activated to prevent the suspended load 17 from falling due to erroneous operation. Further, this spring 9 has a spring constant that is not compressed by the weight of the main body 3.

On the other hand, an engaging pawl 4 for hooking a hanging load 17 is pivotally attached to the lower part of the main body 3 by a pin 5. A protrusion 4a as an engagement part that engages with the engagement part 17a of the hanging load 17 is formed at the lower part of the engagement claw 4, and a protrusion 4b as an engagement part for interlock is formed on the upper part.
is formed, and furthermore, a projection 4 for operation is formed on the inside thereof.
c is provided.

On the other hand, in order to rotate the engaging pawl 4, an operating rod 13 having a roller 16 at its engaging portion is inserted into the main body 3 so as to be vertically movable. Further, 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 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 horizontally passes through a vertically long elongated hole 19 formed therein.
Therefore, when the sub wire rope 11 is remotely controlled to move the operation tube 12 and the operation rod 13 up and down, the roller 1
6 contacts the protrusion 4c and rotates the engagement claw 4, so that the engagement claw 4 can be engaged with or removed from the engagement portion 17a. An operating lever 1 is located between the operating lever 13 and the main body 3.
A spring 15 is interposed to push down 3. Furthermore, in the present invention, an interlock mechanism is provided to lock the engagement claw 4.
It is now possible to prevent the rotation of the That is, the blocking claw 6 that engages with the upper protrusion 4b of the engaging claw 4 is pivotally attached to the main body 3 at its central portion by a pin 8. The rear end of this blocking claw 6 is attached to the support rod 2.
and a pressing pin 7 that presses the tip of the blocking claw 6 against the protrusion 4b of the engaging claw 4.
is provided on the main body 3 via a spring 10. Therefore, when the support rod 2 moves upward relative to the main body 3, the blocking claw 6 rotates due to the bias of the spring 10, and its tip catches on the protrusion 4b of the engaging claw 4, causing the engagement to occur. The operation of engaging and disengaging the pair of claws 4 is prevented. Conversely, when the support rod 2 moves downward, the rear end of the blocking claw 6 is pushed down against the biasing force of the spring 10, so the blocking claw 6 rotates in the opposite direction to the above, and its tip touches the engaging claw 4. is separated from the protrusion 4b, and the engaging pawl 4 becomes able to rotate freely.

Next, a method of using the remote-controlled hanging device of the present invention having the above-mentioned configuration will be described. When attaching the hanging load 17, first, the main wire rope 1 and the sub wire rope 11 are synchronously unwound, and the bottom part 3 of the main body 3 is unwound.
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 13 is lowered by the pressing force of the spring 15 and the weight of the operating tube 12 and the operating rod 13, and the engaging claw 4 is lowered.
By rotating the protrusion 4a, the engaging portion 17
Hang it on a. That is, the state shown in FIG. 1 is changed to the state shown in FIG. 2. 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, hanging load 1
The weight of the support rod 2 resists the biasing force of the spring 9.
is raised and the pressing pin 7 is biased by the spring 10 to interlock the blocking claw 6 with the engaging claw 4.
The hanging load 17 is lifted while being engaged with the lifting tool.

Therefore, even if the sub wire rope 11 is operated by mistake during subsequent transportation and the engaging claw 4 is attempted to be engaged or unlatched, the engaging claw 4 is interlocked and will not rotate, thereby preventing malfunction and preventing the suspension. The 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 ground, the 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 and pushes down the rear part of the blocking claw 6, so that the blocking claw 6 and the engaging claw 4 are disengaged, and the interlock state of the engaging claw 4 is released. Ru. Next, the auxiliary wire rope 11 is pulled up, the operating rod 13 is lifted, and the engaging claw 4 is rotated to return to the state shown in FIG. 1. If the main and auxiliary wire ropes 1 and 11 are hoisted synchronously in this state, the hoisting tool will detach from the hoisting load 17.

As described above, in the remote-controlled hoist of the present invention, the interlock mechanism prevents malfunctions during the transportation of the hoisted load, and there is no risk of the hoisted load falling.

Further, the remote-controlled hoist having the above-mentioned structure is designed so that, if the main wire rope 1 should break during the transportation of a suspended load, only the suspended load 17 will fall, and the hoist itself will be supported by the auxiliary wire rope 11 to prevent it from falling. In other words, if the main wire rope 1 breaks, the lifting load will no longer act between the support rod 2 and the main body 3.
Immediately, the support rod 2 is pushed down by the spring 9, the blocking claw 6 and the engaging claw 4 are disengaged, and the interlock state is released. At the same time as the interlock state is released, the main body 3 and the hanging load 17 are lowered, and tension is applied to the sub wire rope 11, which is always slackened, and the operating rod 13 is pulled upward, causing the engagement claw 4 to be pulled upward.
is disconnected from the engaging portion 17a. Therefore, hanging load 1
7 falls, and the hanging tool is supported by the auxiliary wire rope 11. In other words, as soon as the main wire rope 1 breaks, the interlock state is released, and the engagement claw 4 and the hanging 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. In addition, if a detector is provided to indicate that the hoist is interlocked, it will not be interlocked if the engaging claw does not engage with the hoisted load, making it possible to check whether the hoist is grasping the hoist. .

Next, the drive mechanism for the main and sub wire ropes 1, 11 will be explained based on FIG. As shown in the figure, a gear 23 is attached to the rotating shaft of the main drum 21 around which the main wire rope 1 is wound, and a gear 24 is attached to the rotating shaft of the auxiliary drum 22 around which the auxiliary wire rope 11 is wound. Gears 23 and 2
4, and the rotation speed ratio of the main drum 21 and the sub-drum 22 is 2:1. The rotating shaft of the main drum 21 is connected to a brake motor 26 via a reducer 25, and the rotating shaft of the auxiliary drum 22 is connected to a brake motor 28 via a reducer 27. In addition, the sub-drum 22 and the gear 24
There is a meshing clutch 2 between which the left and right clutch plates in the figure can rotate relatively freely by a certain rotation angle.
9 is attached.

A procedure for operating the remote-controlled hanger of the present invention using such a drive mechanism will be described.

When attaching the load 17 in the state shown in FIG. 1, the secondary drum 22 is first rotated by the brake motor 28 within a range in which the meshing clutch 29 can rotate freely, and the operating rod 1 is connected to the secondary wire rope 11.
Then, the brake motor 26
The main drum 21 and the sub drum 22 are rotated simultaneously by the brake motor 28, and the hoisting tool is lowered onto the load 17. Next, the brake motor 28 rotates, and the sub drum 22 rotates within the range in which the meshing clutch 29 can freely rotate.
The operating rod 13 is lowered and the engaging claw 4 is caught by the engaging portion 17a of the suspended load 17.
The main and sub drums 21, 22 are rotated simultaneously by the rotary shaft 6 to lift the load 17. By reversing the above procedure, the load 17 can be lowered.

As explained above in detail based on the embodiments, the remote-controlled hoist of the present invention is equipped with an interlock mechanism, so there is no risk of the hoisted load falling due to malfunction during transportation of the hoisted load. Since the interlock will not occur if the load is not lifted, it can be confirmed when the load is not lifted, resulting in excellent reliability and safety. Furthermore, even if the main wire rope breaks during transportation, the hanging load can be dropped and the hanging tool can be recovered. Furthermore, since the interlock mechanism is operated directly by a support that moves up and down relative to the suspension body, the axial length can be shortened compared to a structure that uses a link mechanism, and the overall length of the suspension can be reduced. can be made smaller. Further, since the engaging pawl is opened and closed by the vertical movement of the operating rod via the roller, the engaging pawl can be opened and closed extremely smoothly.

[Brief explanation of the drawing]

Figures 1 and 2 relate to the remote-controlled hanging tool of the present invention; Figure 1 is a cross-sectional view showing the state in which the engaging claws are engaged and detached, and Figure 2 is the state in which the engaging claws are interlocked. FIG. 3 is a structural diagram of a driving device for a remote-controlled hanging device according to the present invention. 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 pressing pin, 9, 10, 15 is a spring, 11 is a sub wire rope, 12 is an operating tube, 13
1 is an operating rod, 16 is a roller, and 17 is a suspended load.

Claims (1)

[Scope of Claim for Utility Model Registration] A spring 9 is provided between the suspension body 3 and the suspension body 3.
The support body 2 is assembled so that it can freely move up and down with the help of the support body 3 interposed therebetween, and it abuts and becomes integral with the suspension body 3 at the rising end, and the suspension body 3 is suspended on the support body 2 via the support body 2. The main wire rope 1 is connected to the main wire rope 1, and the engaging claw 4 having the engaging portion 4a is
is rotatably attached to the lower part of the hanging device main body 3 so as to be able to engage and disengage from the hanging load 17 side, and inside the hanging device main body 3, it can freely move up and down with respect to the hanging device main body 3 and the support body 2. At the same time, the operating rod 13 is attached to the lower part of the operating rod 13, and the roller 1 that comes into contact with the engaging claw 4
6, and furthermore, a sub wire rope 1 is attached to the operating rod 13.
1 is connected, and the roller 1 is moved by vertical movement of the operating rod 13.
6 and the engaging pawl 4, the engaging pawl 4 lifts the suspended load 17.
In addition, the engaging claw 4 is provided with an engaging portion 4 for interlocking.
b is provided to prevent one end from engaging with the interlocking engagement portion 4b by spring force and locking the engagement claw 4 when the engagement claw 4 is engaged with the hanging load 17 side. The claw 6 is pivotally attached to the suspender main body 3, and the other end of the blocking claw 6 is exposed to the lower surface of the support 2,
A remote-controlled hanging device characterized in that when the support body 2 is lowered, the blocking pawl 6 is rotated by the support body 2 so that the one end portion is disengaged from the interlock engagement portion 4b.