FI79822C - Device for winding cable - Google Patents

Abstract

Cable winding apparatus comprises a cylindrical drum (1) adapted to hold a plurality of layers of cable wound thereon. The drum has circumferential primary grooves (2) around at least parts of its periphery for accommodating the innermost layer of cable. The cable is arranged to unwind progressively from a first end of the drum to the opposite second end. Secondary grooves (5) are formed in the base of the primary grooves. The secondary grooves are of smaller diameter than the primary grooves and are adapted to accommodate a tail line attached to the innermost end of the cable but of correspondingly smaller diameter. After unwinding of the cable, the tail line will unwind progressively from the second end to the first end of the drum.

Description

1 79822

Cable Reels. - Anordning för uppvindning av kabel.

The invention relates to a cable winding device. The device is suitable for winding and unwinding essentially any type of wire cable, electric wires, rope and the like (hereinafter collectively referred to as "cable").

Cable winders are known and used in many different types. Such devices are used in oil fields, both at sea and on land, and also in ships in general. Other applications include cranes, winches and systems installed in vehicles. The device according to the present invention is suitable for use in all these cases.

Particular attention has been paid to providing some control over how the cables are wound on the drums or reels, especially when the cable is repeatedly pulled out under tension. Devices of this type are described in GB-A 737352 and GB-A 776007.

In the past, problems have arisen in which the hoisting ropes of ships and construction cranes are stuck or accidentally caught in other objects, such as support vessels, moving vehicles, etc. Such hoisting ropes are of uniform diameter and if they get stuck in the drum or interfere with winding equipment or machine construction. or winch, warp off its base or base. This has caused considerable damage and loss of human life in certain situations.

Some of the above disadvantages can be avoided by attaching the inner end of the cable to a rear rope which is smaller in diameter than the cable and has a relatively low load resistance. The main hoisting rope or cable can thus be allowed to pass freely through the machine's rope transmission system, followed by a secondary rope or a rear rope attached to it, which can finally be broken from the drum if a sufficient amount of cable and rear rope have come out of the machine. The rear rope controls the passage of the cable by maintaining tension in the cable as it passes through the winding system, and the rear rope has a substantially lower breaking strength compared to the load capacity of the machine on which the rope is mounted. A vessel that is thus stuck or a falling load attached to the free end of the cable will not be able to pull the hoist off its base. In addition, when using the technique in reverse, a small rear rope can be used to more easily feed the cable through the winding system of the machine on which the drum is mounted. In addition, the invention simplifies the reception of a back rope or cable when winding on or unloading from a drum arranged to receive one or more layers of cable.

If the hoist malfunctions due to overloading or damage to the brake or mechanical breakdown and the load can move freely, the cable will become completely detached from the winch drum without the cable re-twisting in the opposite direction to the drum.

DE-A-1174036 discloses a cable winding device comprising a cylindrical drum arranged to support a plurality of cable layers wound thereon, the drum circumference having primary grooves on at least a portion of its circumferential surface for receiving the innermost layer of the cable, and secondary grooves having smaller grooves than the primary grooves. is intended to receive a rear rope of correspondingly smaller diameter attached to the inner end of the cable.

The invention provides a cable winding device comprising a cylindrical drum arranged to support a plurality of cable layers wound thereon, the drum circumference having primary grooves 3 79822 on at least a portion of its circumferential surface to receive the innermost layer of the cable, and secondary grooves having a smaller diameter than the primary grooves. to receive a rear rope of correspondingly smaller diameter attached to the inner end of the cable, characterized in that the secondary grooves are formed in the bottom of the primary grooves so that the inner layer of the cable winds out in order from the first end of the drum to the opposite end, and the cable is wound out of order from the second end of the drum to the first end.

The invention preferably provides a cable winding device of the type defined above, in which the rear rope is attached to one end of the drum, has a lower load resistance than the cable and is intended to break under tension or to release from the drum when completely discharged from the drum.

When one or more layers of rope or cable are wound on a drum, it is preferable to ensure that guided winding is maintained in all layers. Special drum structures for providing such guided winding are described, for example, in GB-A 737352 and GB-A 776007.

The above-mentioned secondary grooves for the rear rope are suitable for use with various circumferential primary grooves. In a particularly preferred embodiment, two diametrically opposed sets of circumferential primary grooves are arranged on the circumferential surface of the drum and arranged parallel to the ends of the drum. The grooves in one set are placed side by side but offset with respect to the grooves in the other set.

These two sets of main or primary grooves are both 4,79822 shorter in length than half the circumference of the drum, providing two axially extending diametrically opposed cable guide zones on the circumference of the drum. Secondary, smaller grooves are formed at the bottom of the main grooves described above, wherein · the secondary grooves are formed in the opposite direction across the width of the cylinder relative to the main grooves, i.e. if the main groove rotates right-handed, then the secondary groove rotates left-handed, and vice versa.

This ratio remains the same regardless of whether the cable is wound on the drum from above or below. The groove of the rear rope passes from a starting point determined by the required length of the rear rope, following the track along the bottom of the primary groove but in the opposite direction, whereby the intersection points of the groove coincide at two radially opposite points of the drum. The secondary groove goes to the main groove at a predetermined location near the second flange.

The grooves described above can be formed integrally on the core or cylinder of the drum. Alternatively, the grooves may be arranged as split covers mounted on a flat cylinder or the like around the main drum.

Reference is now made to the accompanying drawing, in which:

Figure 1 shows a side view of a cable winding device according to a preferred embodiment of the invention.

Figure 2 shows an exploded plan view of the device shown in Figure 1.

Figure 3 shows a section along the line 3-3 in Figure 2.

Figure 4 shows an end view of the drum of Figure 1.

In the drawing, reference numeral 1 denotes a drum, on the circumference of which primary grooves 2 are arranged for the guided winding of the cable 5 79822. This arrangement of primary grooves is known per se and is described, for example, in GB-A 776007. The primary grooves are arranged in two diametrically opposed sets, both parallel to the ends of the drum, but displaced axially with respect to each other by half the width of the groove. Each set of grooves is less than half the length of the circumference of the drum, so that two axially extending, diametrically opposed cable guide zones 3 are arranged on the circumference of the drum. Such guide zones may be flat or may be provided, as shown in the drawing, with a series of helical grooves communicating between adjacent ends of two main sets of grooves. In a conventional manner, feed guides 4 are arranged at both ends of the drum to guide the cable between the two sets of primary grooves and thus to provide a guided winding. Thus, each of the helical grooves of the cable run axially displaced half a degree.

According to the invention, secondary grooves 5 are arranged at the bottom of the primary grooves. They are smaller in diameter than the primary grooves and correspond to a diameter of the rear rope which is correspondingly smaller in diameter than the cable. The secondary grooves rotate in the opposite direction compared to the primary grooves. This is accomplished by machining the secondary grooves so as to intersect the primary grooves at point 3 of the two sets of helical grooves. Thus, the two sets of intersection points coincide with respect to the diameter on opposite sides of the drum.

The cable joins the rear rope at the point where the secondary groove 5 begins, close to the cable start feed guide,

The cable and rear rope joints are as short as possible to minimize the unsupported length of the second layer of cable. As shown in the drawing, the 6 79822 secondary groove 5 runs, opposite to the main groove, to the opposite end of the drum, where the rear rope passes through the drum cylinder and is fixed in a known manner at a point determined by the length of the required rear rope at the cylinder point.

The above arrangement helps to wind the cable through the rope pulling system onto the drum. The rear rope first passes through the drum and attaches to the side of the drum near one end of the secondary groove. The drum can then be twisted and first the rear rope and then the cable are wound on the drum in a controlled manner. If the cable gets stuck or sticks to a load moving away during use, the following safety features of the invention come into play. The cable can rotate freely through the winding system and remains taut as it is attached to the rear rope. After this, the rear rope, in turn, passes through the winding device until it has either completely come out of the drum or breaks due to tension because it has a substantially lower breaking strength compared to the load capacity of the drum or associated device. Thus, although the cable may be lost in some cases, the cable winder itself remains undamaged.

Claims (5)

A cable winch device, comprising a cylindrical tubing (1), arranged to support several of this wound cable layer, primary grooves (2) on the perimeter of the drum at least on a portion of its peripheral surface to receive the innermost layer of the cable, and secondary grooves ( 5), the diameters of which grooves are smaller than those of the primary rafters and which are intended to receive an analogously smaller diameter rear end line of the cable, characterized in that the secondary rafters (5) are formed in the bottom of the primary rafters (2) in such a way that the innermost layer of the cable is wound out of order from the first end of the drum to its opposite second end, and after that, the cable is wound out, the rear line is wound out of order from the other end of the drum to its first end. Cable winch device according to Claim 1, characterized in that the rear rail is fixed to one end of the drum (1) and has a lower load strength than the cable, and is intended to disengage under tension or to come out of the drum, where it fully and the pour out of the drum. Cable winch device according to claim 1 or 2,. characterized in that the primary latch (2) is arranged in two relative to diameter opposing series and positioned parallel to the ends of the drum (1), the latch of each series being adjacent to each other, but axially displaced relative to the latch of the opposite series, and each of the two series to their length is below half of the perimeter of the drum so as to provide two axial, in relation to the diameter, at the perimeter of the drum, opposite cable control zones (3). Cable winch device according to claim 3, characterized in that the helical primary rafters (2) are arranged in the cable control zones (3) to connect between the adjacent ends of the two series parallel primary rafters and move the cable axially half a rise. l0 79822 Cable winch device according to claim 4, characterized in that the secondary grooves (5) intersect the primary groove (2) at the coiled grooves.