DE2365374A1 - Hoist rope maximum winding monitoring equipment - has pivot-mounted roller engaging pawl with drum flange - Google Patents

Abstract

The equipment is for use with hoists driven via slipping clutches and not equipped with a spooling mechanism for several layers of rope. A pivot-mounted monitoring roller causes a double pawl to tilt, when the maximum or minimum number of rope layers is reached, and engage in recesses in the drum flange. The dia. of the roller is reduced on the side nearest the rope anchorage. The system enables the rope to be fully controlled during the entire lifting or lowering sequence and also at the ends of the runs.

Description

R. STAHL, Stuttgart

Cable monitoring device for hoists

The invention relates to a monitoring device for Wire ropes on rope drums for hoists with slip clutches, where the rope is in multiple layers and without a rope winder on the Drum is saved.

Rope monitoring devices with rope winder e.g. according to DPS 956 441 or similar designs combined with a limit switch are known and have proven themselves in larger winches and in the event that the rope is only in one position on the drum is wound up and the cable drum is provided with grooves, has so far been well proven and is almost exclusively used in these cases used. The limit switch is then actuated by a rope winder which engages in the rope grooves of the drum like a nut and comprises several rope windings. In the case of smaller hoists, however, which also allow the rope to be wound in several layers on a grooveless drum a rope winder in the above form and the associated type of limit switch actuation cannot be used because the rope winder is only tailored to a certain drum diameter and the rope grooves for its axial displacement does not exist.

Hoists in which the rope is wound up in several layers without a rope winder are also known (e.g. rope hoist from the company Th. GaIl Nürtingen). With these hoists, the rope is indirectly monitored by a limit switch, although this is only in the top hook position is actuated by the hook block via an overrun flap. A check of the equally important However, the lowest hook position is not easily possible using the hook block. There would be extensive additional ones Measures in accordance with or similar to DPS 1 116 364 required.

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Likewise, with these cable pulls that have become known, the cable is not prevented from being unilaterally on one side of the drum wrapped in an uncontrolled number of layers on top of each other.

In order to counteract this danger to some extent, a hand hoist that has become known (Comet Industries, Richmond / USA) Arranged guide plates, which consist of a wound rope layers on a portion of the drum diameter comprehensive, the entire drum length covering resilient element exist that the rope against the drum presses.

This measure has the disadvantage that, as a result of the friction between the guide plate and the rope during unwinding, it is unloaded Hoists can cause slack rope formation on the drum and the constant dragging on the rope increases wear works. In the case of hoists with manual operation, these disadvantages are hardly significant. This is different, however, with motor-driven ones Hoists where the rope speeds and duty cycles are much higher.

With smaller hoists, especially with chain electric hoists, slip clutches are often used instead of the limit switch Stroke limitation provided, which results in a more compact design compared to the version with limit switch and the possibility Overload protection to increase safety (see DPS 1 264 o14). The increase in security also serves to the same extent monitoring of the load rope.

The object of the invention is to create a cable monitoring device for a hoist which, while also using a The slip clutch controls the rope during the entire lifting and lowering process and also in the end positions.

409882/0281

According to the invention, the object is achieved by using hoists the rope drum with a rope monitoring device equipped in such a way that it consists of a pivotably mounted control roller and at least one double pawl exists, whereby this is swiveled out so far by the control roller at the maximum or minimum permissible number of layers of the rope is that it falls into recesses of the drum rim. This makes the highest and lowest hook positions easy Way fixable. When the pawl falls into the drum rim, the movement of the cable drum is blocked and the slip clutch comes into operation. The drive can now be switched off or, if necessary, also switched over via the control switch will.

The control role is fulfilled by the fact that it is attached to the rope facing side is reduced in diameter by the amount 2 times the rope diameter and the reduction in their length extends to three to four turns of rope, in addition, the requirement that some in the lowest hook position Safety windings remain on the cable drum. With the rope monitoring system according to the invention, jumping and this avoids harmful overlapping of the rope windings on the drum when the rope is unloaded and prevents the Improved rope on the drum with little or no load will. Should this still happen in exceptional cases due to diagonal pull or the like, although the highest hook position has not yet been reached, the pawl is brought into place via the control roller and thus the possibility given a correction.

The control device also ensures that it not for stripping or jamming the cable windings on the housing parts can come in the area of the rope drum, since the outer diameter of the rope layer can be kept so that it corresponds at most to the outer diameter of the drum rim.

An exemplary embodiment of the subject matter of the invention is shown in the drawing. Show it:
Fig. 1 is a plan view of the cable drum

409882/0281

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Fig. 2 shows a section through the cable drum with the sunken Double latch in the highest position of the hook

Fig. 3 shows a section through the cable drum with the sunken Double latch in the lowest position of the hook

The cable drum 2 mounted in the cheeks of the winch frame 1 shows the safety windings of the cable in a top view Also in the cheeks of the winch frame 1, a bolt 4 is screwed on each side, the storage for the Double latch 5 represents. The double pawl 5 in turn carries a lever 6 which contains the storage for the control roller 7. The control roller 7 is reduced in diameter on the side facing the rope attachment in the area of the safety windings. The control roller 7 is pressed by the springs 8 against the rope layers, the springs on the one hand in the The cheeks of the winch frame 1 and, on the other hand, engage in the double pawls 5.

When the rope runs up, the control roller 7 is raised. This swivels it and thus also the double pawl 5 so far around the Bolt 4, that their one latch nose in recesses of the drum rim clicks into place. This blocks the movement of the cable drum 2 and the slip clutch, not shown, comes into play Function. This means that one of the end positions of the hoist has been reached and the operator can turn off the engine using the control switch. See Fig. 2.

When the rope runs off, there is a control roller 7 and thus a double pawl 5 in the opposite direction until the other pawl nose falls into the recess of the drum rim and thus again blocks the movement of the cable drum 2 and thereby fixes the lower end position of the hook. Here too this causes the slip clutch to function. See Fig. 3.

409882/0281

Claims (1)

Claim Cable monitoring device for cable drums of hoists with slip clutch and. without rope winder for several rope layers, characterized in that the rope monitoring device consists of a pivotably mounted control roller and
There is at least one double pawl, which is swiveled out by the control roller with the maximum or minimum permissible number of layers of the rope so that it falls into recesses in the drum rim, the diameter of the control roller being reduced in the area of the safety turns on the side facing the rope attachment . 409882/0281 Blank