JPS64309B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a drum that can rotate about an axis for winding or unwinding cables, etc., and the cables, etc. are constantly extended in a large number of windings around the drum and applied to a large number of pressure devices. It thus relates to a winding and unwinding device for cables or other elongated objects which is displaced by a movable support ring which is axially displaced along the cylindrical surface of a drum.

Devices of this type are used in particular for laying submarine cables, etc. from laying ships which store the cables on horizontal rotary tables. The cables from this table are preferably guided via a tensioning device to a cable drum rotating about a horizontal axis. From this drum, the cable passes through guide pulleys and overboard, making an arc to the ocean floor.

In order to obtain adequate friction between the cable and the drum, the cable is wrapped around the drum several times, preferably three times. This frictional force serves to hold the cable against uncontrolled payout from the ship to the ocean floor due to the weight of the cable itself. The rotation of the drum can be adjusted by means of a drive via transmissions, and with these devices the device can also be used to pull up laid cables if necessary.

The cable turns are juxtaposed and therefore tend to move axially as the drum rotates. To prevent this,
The cable turns are pressed along the drum by a support ring.

FIG. 5 of the attached drawings shows a conventional example in which the cable winding is displaced by a fixed supporting and pressing member provided at a certain angle with respect to the drum, and A shows the winding of cable B. C is the rotation axis of the drum A that is being rotated. D is a support pressing member that displaces the cable B wound around the drum A, and this support pressing member D is connected to the drum A and its rotating shaft C.
It is mounted at an angle to the drum A on an arm member E, which is supported, for example, on the structure of a cable-laying ship, independently of a bearing support (not shown). A force f ₁ along the axial direction is applied to the support pressing member D via the arm member E, and a reaction force f ₂ to this is applied to the rotation axis C of the drum A.

FIG. 6 shows another conventional example in which a support ring for displacing a cable on a drum is rotated in synchronization with the drum. In FIG. 6, F is a drum around which the cable G is wound, supported by a bearing support H, and driven by a motor J via a gear system I. Also, K is a support ring, and this support ring K
is pressed with a force f ₁ axially at an angle to the drum F by a plurality of supporting guide rollers M mounted on a peripheral frame L which is supported independently of the drum and its bearing support H. has been done.

By the way, in the conventional example shown in FIG. 5, in addition to the axial force generated on the drum, large sliding friction occurs between the cable and the support pressing member.
Not only does the cable rub and wear, and the sheath burns out due to frictional heat, but it also causes a large loss of energy. In other words, both the weight of the cable and the frictional force from the supporting and pressing members are applied to the drum drive motor as loads, and the frictional force from the supporting and pressing members supports the weight of the cable, although it depends on the structure and dimensions of the cable. It can reach 30-40% of the force required for

Furthermore, in the conventional example shown in Fig. 6, a large number of support guide rollers are required to generate the necessary displacement with respect to the support ring, and the displacement force f ₁ causes an axial reaction force f ₂ on the drum. Become. Also, since the drum is used for both cable installation and retrieval, two sets of support rings are required, although not shown in FIG. Therefore, not only does it have a considerable weight, but it also requires a considerable amount of space. Furthermore, the support and guide rollers are exposed to seawater, sludge, corrosion, etc., and maintenance is extremely difficult.

Thus, one major problem with conventional devices is that the mechanism for displacing the cable is supported by the structure of the cable-laying vessel.
Cable drums have become increasingly larger in recent years, with an outer diameter of 10 m.
It is also known that

And since the forces are received in the surrounding structure of the drum, a strong and large structure is required as a result, due to the bending moments acting on the laying ship structure, the main support shaft of the drum and the bearing structure, and thus the moment arm can be more than 5m long. The frame and base around the drum will be very heavy to avoid large deflections.

This invention solves these problems by generating power inside the drum to displace the cable.
Winding and winding of cables or other long objects such that no external forces act on the drum except for cable tension.
The purpose of the present invention is to provide a feeding device.

To achieve this objective, a device for winding and unwinding cables or other elongated objects according to the invention comprises a drum rotatable about an axis for winding or unwinding cables or other elongated objects; a pressure device consisting of a movable support ring for displacing a cable or other elongated object extending in a number of turns around the drum, and a hydraulic cylinder mounted on the drum for displacing the movable support ring axially along the cylindrical surface of the drum and a non-rotating member rotatably supported by the drum, and a hydraulic pump cylinder mounted on the drum that is operated by the non-rotating member in response to rotation of the drum and generates pressure to drive the hydraulic cylinder. It is a feature.

The non-rotating member may be an eccentric disk fixed to the support of the drum.

In the device of the invention constructed in this way, large axial forces on the bearing support of the drum are avoided, and large radial forces and bending movements on the respective bearing and shaft of the drum can occur during return.

Also according to the invention, by rotatably supporting the non-rotating member on the drum, the loads on the drum bearing support and shaft can be further reduced.

The relatively large forces exerted by the non-rotating member can thus be balanced by the forces acting on the drum via the non-rotating member. As a result, only a small portion of the drum is subjected to these relatively large loads.

According to the invention, preferably the part of the non-rotating member acting on the hydraulic pump cylinder may be located in a plane that is generally not parallel to the radial plane of the drum, thereby providing an axial force on a relatively small annular part of the drum. An upward force can work. Furthermore, the non-rotating member is constructed by combining thrust and radial bearings, one bearing is attached to the drum, the other bearing forms the part that acts on the hydraulic pump cylinder, and both bearings are arranged in planes that are not parallel to each other. A relatively compact and simple variation can be obtained by attaching the transmission members to each other by substantially annular transmission pieces of varying thickness. By rotatably mounting the hydraulic pump cylinder to the drum and said other bearing, a self-aligning effect is obtained between these parts which minimizes the loads created.

Said part of the non-rotating member can be held against rotation in a simple and suitable manner by at least one pin fixed to the support structure of the drum, which engages in a slot in this part.

In order to better understand the invention, reference will now be made to illustrative embodiments.

FIG. 1 schematically shows the stern of a laying vessel 1, which is equipped with a propeller 2 and a rudder 3.
The cable 4 runs from a storage drum (not shown) through a pivot bridge 5 and a tensioning device 6 to a drum device 7 and from this drum device 7 runs over a guide pulley 8 provided at the stern of the laying vessel 1. do.

As can be seen from FIGS. 2 and 3, the drum device 7 consists of a drum 9, which has a cylindrical surface 10,
It includes a shaft 11 and a bearing 12.

As shown in FIG. 2, a number of hydraulic cylinders 13, 13a act on support rings 14, 14a, each movable in the axial direction, on the cylindrical surface 1 of the drum 9.
It is provided along the edge of 0. The support ring 14 and the cylinder 13 are arranged so that when the cable 4 is wound onto the drum 9 from the storage drum, i.e. when the cable 4 is unwound from the laying vessel 1 and the direction of rotation of the drum 9 is in a counterclockwise direction as seen in FIG. It operates when . The support ring 14a and the cylinder 13a are activated when the drum 9 rotates in a clockwise direction, i.e. when the cable is drawn into the laying vessel 1. Since these two operations are performed in the same way, only the cable laying operation will be described below.

As shown in FIG.
mounted on. The pressure sides of each pair of cylinders 13, 15 are connected through a pipe line 16, and the return sides are connected via a pipe line 16b.

The hydraulic cylinder 15 is attached to the side 9a of the drum 9 at 17
The piston rod 18 of the hydraulic cylinder is rotatably mounted on a bracket 19, which is connected to the outer ring 2 of a thrust radial bearing 22 via a bolt 20.
It is attached to 1. The inner ring 23 of this bearing 22 is attached by bolts 24 to an annular transmission piece 25 of varying thickness. This transmission piece 2
5 is also attached by bolts to the outer ring 26 of the thrust radial bearing 27, and the inner ring 28 is bolted to the side 9a of the drum 9.

The inner ring 23 of the bearing 22 has a plate segment 29
The plate segment 29 is provided with a U-shaped recess 30. A pin 31 engages in this U-shaped recess and is attached to a bearing support 32 of the shaft 11 of the drum. Therefore, the pin 31 is connected to the plate segment 2
9 and inner ring 23 from rotating with the drum 9. Instead of the outer ring 2 of the bearing 22
1 is a connection with a hydraulic cylinder 15 and a drum 9
It is forced to rotate with the drum 9 by a support 33 mounted between the bracket 34 and the outer ring 21 on the side 9a of the drum. Therefore, the piston rod 18 is in the third position when the drum rotates.
It also moves between the uppermost and lowermost positions shown.

The reaction force to the force required to move the piston rod 18 is transferred from the bracket 19 to the hydraulic cylinder 15.
The bearing 22, the transmission piece 25, the bearing 2
7 and the portion of the drum side 9a located between the bearing ring 28 and the cylinder 15. This annular part can be constructed relatively narrowly, so that although considerable forces have to be transmitted to the piston rod 18 by the hydraulic cylinder 13 in order to move the support ring 14 and the cable 4, the bending stresses that occur are relatively small. be.

The invention may be modified in various ways within the scope of the claims. For example, instead of the two bearings 22, 27 and the transmission member 25, an eccentric disk rotatably supported on the shaft 11 of the drum 9 may be used, which eccentric disk extends parallel to the drum side 9a and, for example, In the example shown, rotation is prevented in the same way. In this case hydraulic cylinder 1
5 must also be provided parallel to the drum side portion 9a.
The reaction force must be transmitted to a large part of the drum side 9a, but the drum side is not subjected to bending loads,
It is also possible to use relatively simple supports for the eccentric disks.

[Brief explanation of the drawing]

FIG. 1 shows schematically the device according to the invention installed on a ship, and FIGS. 2 and 3 are axial cross-sectional views showing the pressure devices installed along the circumference of the drum and the elements for operating these devices. Yes, Figure 4 is the 3rd
Sectional views along the lines of Figures 5 and 6.
The figure is a schematic diagram showing a conventional device. In the figure, 4: cable, 9: drum, 10: cylindrical surface, 13, 13a: pressure device, 14, 14a: movable support ring.

Claims (1)

[Claims] 1. It has a drum 9 that can rotate around its axis in order to wind up or unwind the cable 4, etc., and the cable 4, etc. always extends a large number of windings around the drum 9, and a large number of pressure devices 13. , 13a, the above-mentioned pressure device 13 , 13a are hydraulic cylinders 13, 13a provided on the drum 9, and a non-rotating member 23 rotatably supported on the drum 9.
- 26, and a drum 9 that is operated by the non-rotating members 23 to 26 in accordance with the rotation of the drum 9 and generates pressure for driving the hydraulic cylinders 13, 13a.
A winding/feeding device for cables or other elongated objects, characterized in that it has hydraulic pump cylinders 15, 15a mounted on. 2. Device according to claim 1, in which the part 23 of the non-rotating member 23-26 acting on the hydraulic pump cylinders 15, 15a lies substantially in a plane that is not parallel to the radial plane of the drum 9. 3 The non-rotating members 23 to 26 are coupled to thrust radial bearings 22 and 27, and one bearing 27
is mounted on the drum 9, the other bearing 22 forms the part acting on the hydraulic pump cylinders 15, 15a, the two bearings 22, 27 are located in mutually non-parallel planes, and the annular shape is of non-uniform thickness. 3. A device according to claim 2, which is connected to one another by a transmission piece (25). 4 The hydraulic pump cylinders 15, 15a are connected to the drum 9
4. The device according to claim 3, which is rotatably attached to the other bearing 22. 5. Claims 2 to 4 in which the non-rotating members 23-26 are held against rotation by at least one pin 31 fixed to the support structure 32 of the drum 9 and engaging in the slot 30. Apparatus according to any of paragraphs. 6. Device according to claim 5, in which a number of pressure devices 13, 13a are substantially uniformly spaced along the circumference of the drum 9.