JPH0120391Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a device for preventing overwinding of a hanging rope in a lifting device.

Prior Art A support vessel used to lower or raise a capsule (container) for transporting people to an undersea base is equipped with a capsule lifting device, and the lifting device usually includes a lower part. A frame for hanging a capsule and a winch for hanging ropes are provided, which can rotate around a substantially horizontal axis of the frame. is suspended. The capsule lifted by the lifting device is swung out from the ship above the sea surface by the rotation of the frame, then lowered into the sea by the letting out of the sling, and conversely, the capsule is lowered to the sea surface by the winding of the sling. After being pulled upwards, it is thrown onto the ship by rotating the frame.

The above-mentioned lifting device is provided with an overwinding prevention device shown in FIG. 1 in order to prevent overwinding of the suspension rope when pulling up the capsule. In FIG. 1, 1 is a frame for hanging a capsule, 2 is a pulley, and 3 is a hanging rope. A wire socket 4 for attaching a hanging fitting is fixed to the tip of the hanging rope 3. Reference numeral 5 denotes a pair of small sheaves on the left and right sides of the pulley 2 at positions corresponding to the outer periphery of the pulley 2.
It is hung on. The upper end of one weight support cable 6 is connected to the frame 1 via a limit switch 7, and the upper end of the other weight support cable is directly connected to the frame 1, although not shown. 8 is a horizontal plate-shaped weight whose both ends are suspended from the lower ends of the two weight support cables 6, and a circular cable guide hole (not shown) is bored in the middle part of the weight 8. And pulley 2
A portion near the tip of the suspension rope 3 which has been hung vertically is passed through the suspension guide hole of the weight 8, and the wire socket 4 is located below the weight 8. The size of the cable guide hole is determined so that the cable 3 can freely pass through with a large gap, but the wire socket 4 cannot pass through.

When winding in or letting out the sling 3 with the wire socket 4 below the weight 8, the sling 3 freely moves up and down within the sling guide hole of the weight 8, and the sling 3
Therefore, no upward or downward force is applied to the weight 8. Therefore, a relatively large tension due to the weight of the weight 8 acts on the weight support cable 6, and the limit switch 7 is thereby held in the on state. When winding the suspension rope 3, when the wire socket 4 reaches the suspension rope guide hole of the weight 8, the wire socket 4 cannot pass through the suspension rope guide hole, so that the weight 8 is slightly lifted. As the weight 8 is lifted, the tension in the weight support rope 6 is reduced, so the limit switch 7 is turned off, and the winding operation of the rope winch is thereby automatically stopped. Over-winding of the cable 3 is prevented.

In the conventional overwinding prevention device as described above, when the frame 1 rotates and its angle changes, the positional relationship between the center of the pulley 2 and the sheave 5 changes, and as a result, the position of the suspension rope 3 near the tip changes. Since the positional relationship between the point where the lower portion of the weight support rope 6 separates from the pulley 2 and the point where the lower portion of the weight support rope 6 separates from the sheave 5 changes, the following problem occurs. If the point near the tip of the suspension rope 3 leaves the pulley 2 and the point where the lower part of the weight support rope 6 leaves the sheave 5 are almost not shifted in the front and back, as shown in Figure 1a, the two The weight support cable 6 hangs down due to the weight of the weight 8, and the center of the sling guide hole approximately coincides with the sling 3. Therefore, the weight 8 does not interfere with the suspension rope 3. However, as shown in Figure 1b, the suspension rope 3
If the point at which the tip of the weight support cable 6 separates from the pulley 2 and the point at which the lower part of the weight support cable 6 separates from the sheave 5 are shifted forward or backward, the weight 8 will interfere with the sling 3 and move forward from the hanging state. The two weight support ropes 6 become oblique. For this reason, the hanging rope 3 always has a weight of 8
The limit switch will move up and down in contact with the front edge of the rope guide hole, making the limit switch operation uncertain.

Purpose of the invention The purpose of this invention is to provide an overwinding prevention device that is reliable in operation and does not cause the above-mentioned problems.

Structure of the invention The overwinding prevention device according to this invention is installed on both sides of the pulley in a lifting device in which a pulley is attached to a suspension rope support member that can rotate around a substantially horizontal axis, and the suspension rope is hung on the pulley. A pair of guides each having an arc-shaped guide surface that roughly corresponds to the part of the pulley on which the suspension rope hangs, and several pairs of guides fixed in a protruding manner sandwiching the guide surface; Two weight support cables are connected to the cable support member and the middle part is hung on the guide surface of each guide, and the parts near both ends are suspended from the lower ends of these weight support cables, and a hanging cable guide is attached to the middle part. It is equipped with a weight having a hole and a limit switch provided on at least one of the two weight support cables.

Embodiment and operation FIG. 2 shows the front part of the support vessel 11 of the service capsule 10 that transports people to an undersea base. This ship 11 is equipped with a lifting device for the capsule 10 as described below. That is, there is a capsule storage platform 13 on the deck 12 at the front of the ship 11, at the center of the left and right sides.
is provided, and the lower ends of a pair of left and right legs of an approximately A-shaped capsule suspension frame (suspension rope support member) 14 are attached to both left and right sides slightly in front of this stand 13 so as to be rotatable back and forth. ing. frame 14
A pulley 16 is attached to the upper left and right center of the frame 14 via a pair of left and right support plates 15.
The pair of left and right hydraulic cylinders 17 cause the pulley 16 to tilt slightly backward as shown by the chain line in FIG.
is located above the storage platform 13, and the pulley 16 is tilted forward as shown by the solid line in the same figure, and the pulley 16 is at sea level L.
Rotates back and forth between upper working positions.
A rope winch (not shown) is installed on the deck 12 in the center of the left and right at the rear, and this winch and storage platform 1
A guide roller 18 is installed on the deck 12 between 3 and 3. Then, the sling 19 wound around the sling winch passes through the guide roller 18 to the frame 14.
is hung on the pulley 16, and a hanging metal fitting 2 is attached to the tip of the
Capsule 10 is suspended via 0. In addition,
A wire socket 21 for attaching a hanging fitting 20 is attached to the tip of the hanging rope 19.

The lifting device for the capsule 10 includes figures 3 to 7.
An overwinding prevention device is provided as shown in detail in the figures. That is, a pair of substantially fan-shaped plate-shaped guides 23 having arc-shaped guide surfaces 22 that roughly match the portion of the pulley 16 on which the suspension rope 19 is hung are arranged on both left and right sides of the pulley 16 of the frame 14 . At the top of the guide 23, there is a 1
A pair of guide plates 24 are fixed in a protruding manner, and the upper ends of these guide plates 24 are fixed to the upper part of the frame 14 on both sides of the pulley 16. Guide 23
Several pairs of guide rods 25, 26, and 27 are fixed to the guide surface 22 in a protruding manner so as to sandwich it. The two weight support ropes 28 are each
It is passed between the pair of guide plates 24 of each guide 23 and hung on the guide surface 22. The upper end of one weight support cable 28 is connected to a limit switch 29 attached to the upper part of the frame 14, and the upper end of the other weight support cable 28 is directly connected to the upper part of the frame 14. A horizontal plate-shaped weight 30 is suspended from the lower ends of the two weight support cables 28 at both ends thereof, and a circular cable guide hole 31 is bored in the middle part of the weight 30. The weight support cables 28 hang down due to the weight of the weight 30, and the weight support cables 28 hang down when the frame 14 is in any position between the storage position and the working position.
The point at which the lower part of 8 leaves the guide 23 is always in the middle of the guide surface 22. Therefore, even if the frame 14 rotates, the positional relationship between the point at which the lower part of the weight support cable 28 separates from the guide 23 and the point at which the part near the tip of the suspension cable 19 separates from the pulley 16 remains constant. And there is almost no difference between them. Further, regarding the two upper pairs of guide rods 25, the tips of each pair are separated from each other, and the weight support cable 28 is always held between each pair of guide rods 25. Regarding the middle three pairs of guide bars 26, the tips of each pair are integrally connected, and the weight support cable 28 is always interposed between each pair of guide bars 26. The lengths of the three intermediate pairs of guide rods 26 are determined so that the weight support cables 28 do not interfere with their tips no matter where the frame 14 is located. Two pairs of lower guide rods 27
In this case, the tips of each pair are separated from each other and open slightly outward, and the weight support cables 28 fit between or separate from the guide rods 27 of each pair, depending on the position of the frame 14. Also, hanging rope 1
The portion of pulley 9 closer to the tip than the pulley 16 is passed through the hole 31 of the weight 30, as in the conventional case.

Note that the ship 11 is also provided with other facilities and devices similar to those of the prior art, but a description of these will be omitted.

In the ship 11 described above, the work of lowering the capsule 10 into the sea is carried out as follows.

First, before starting work, place the capsule 10 on the storage platform 1.
3 and rotate the frame 14 to the storage position. Then, the wire socket 21 at the tip of the hanging rope 19, which is let out from the hanging rope winch and passed through the guide roller 18, the pulley 16 of the frame 14, and the hole 31 of the weight 30, is connected to the capsule 10 via the hanging fitting 20. And sling 19
After slightly winding up the capsule 10 from the storage platform 13, the frame 14 is rotated to the working position and the capsule 10 is swung out above the sea surface L. Next, the suspension line 19 is gradually let out to lower the capsule 1 into the sea.

The operation of pulling up the capsule 10 is performed in the reverse order to the above.

That is, first, with the frame 14 fixed at the working position, the sling 19 is gradually reeled in to lift the capsule 10 above the sea level L, the frame 14 is rotated to the storage position, and the capsule 10 is moved to the storage stand. 13 Swing upwards. And finally, hanging rope 1
9 is paid out a little, the capsule 10 is placed on the storage stand 13, and the hanging fitting 20 is removed from the capsule 10.

During the operation of lowering the capsule 10 into the sea and during the operation of pulling it up, the overwinding prevention device operates to prevent the suspension line 19 from overwinding, as in the conventional case. That is, when the wire socket 21 is below the weight 30,
The weight of the weight 30 keeps the limit switch 29 in the on state, allowing the hanging rope 19 to be freely wound in and let out. And wire socket 21
When the rope 19 is reeled in until it reaches the hole 31 and slightly lifts the weight 30, the tension in the weight support rope 28 is reduced and the limit switch 29 is turned off, thereby stopping the reeling of the rope winch. Operation stops automatically. In the case of this overwinding prevention device, as described above, even if the frame 14 rotates, the point at which the lower part of the weight support cable 28 separates from the guide 23 and the part near the tip of the suspension cable 19 separate from the pulley 16. Since the positional relationship with the point is constant and there is almost no longitudinal deviation between them, the two weight support ropes 2
8 hangs down due to the weight of the weight 30, and the center of the sling guide hole 31 roughly coincides with the sling 19. Therefore, the weight 30 does not interfere with the hanging rope 19 when the frame 14 is in any position between the storage position and the working position.

Note that the overwinding prevention device according to this invention is not only applicable to the lifting device for the capsule 10 as described above.
Applicable to any other lifting equipment.

Effects of the invention The overwinding prevention device according to this invention is installed on both sides of the pulley in a lifting device in which a pulley is attached to a suspension rope support member that can rotate around a substantially horizontal axis, and the suspension rope is hung on this pulley. a pair of guides each having an arcuate guide surface that roughly matches the part of the pulley on which the suspension rope is attached, and several pairs of guide rods fixed in a protruding manner sandwiching the guide surfaces; Two weight support cables are connected to the suspension cable support member and have their intermediate parts hung on the guide surface of each guide, and the parts near both ends of these weight support cables are suspended from the lower ends of the weight support cables, and the suspension cables are connected to the middle part of the weight support cables. Since it is equipped with a weight having a guide hole and a limit switch provided on at least one of the two weight support ropes, even if the hanging rope support member rotates and its angle changes, the lower side of the weight support rope The positional relationship between the point where the part leaves the guide and the point where the part near the tip of the suspension cable leaves the pulley is constant, and the weight support cable is always caught between each pair of guide rods, so that the weight is always The support rope can be suspended by the weight of the weight so that the center of the sling guide hole and the sling can be roughly aligned. Therefore, even if the angle of the suspension rope support member changes, the weight will not interfere with the suspension rope, and the operation of the limit switch will not become uncertain as in the conventional case.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of the main part of a conventional overwinding prevention device, Figs. 2 to 7 show an embodiment of this invention, and Fig. 2 is a partial cutaway of the front part of a service capsule support ship. 3 is an enlarged side view of the overwinding prevention device shown in FIG. 2, FIG. 4 is a view along the line shown in FIG. 3, and FIG. 6 is a sectional view taken along lines A-A, B-B and C-C in FIG. 3, and FIG. 7 is a view corresponding to FIG. It is a drawing. 14... Capsule hanging frame (hanging rope support member), 16... Pulley, 19... Hanging rope, 22...
... Guide surface, 23 ... Guide, 28 ... Weight support cable, 29 ... Limit switch, 30 ... Weight, 3
1... Hanging rope guide hole.

Claims (1)

[Scope of utility model registration request] In a lifting device in which a pulley is attached to a sling support member that can rotate around a substantially horizontal axis, and a sling is hung on this pulley, the part of the pulley that is arranged on both sides of the pulley and roughly corresponds to the part on which the sling is hung. A pair of guides each having an arcuate guide surface and several pairs of guide rods sandwiching the guide surface and fixed in a protruding manner. Two weight support cables hung on the guide surface of the guide, weights with portions near both ends suspended from the lower ends of these weight support cables and having a cable guide hole in the middle, and two weight support cables. An overwinding prevention device comprising a limit switch provided on at least one side of the cable.