Search

EP-3969402-B1 - WIRE ROPE HOIST LIMITER

EP3969402B1EP 3969402 B1EP3969402 B1EP 3969402B1EP-3969402-B1

Inventors

  • RITALA, MIKKO

Dates

Publication Date
20260513
Application Date
20200513

Claims (13)

  1. A wire rope hoist limiter device (100), comprising: a fastener (110), which is arranged to fasten around the wire rope of a wire rope hoist; a sliding weight (120) arranged to slide along the wire rope (10) of the wire rope hoist towards the fastener (110); a detector (150, 160), which is arranged to be fastened to the wire rope of the wire rope hoist by means of the fastener (110); wherein: the detector (150, 160) is arranged to detect the sliding weight (120) at a certain distance from the fastener (110) and to give a stop signal for the wire rope hoist in response; the detector (150, 160) comprises detection means (160) and a switch (150) fastened to the fastener (110); when switched on, the switch (150) is arranged to provide a signal for stopping the wire rope hoist; the detection means (160) are arranged to cause the switching on of the switch (150); the sliding weight (120) comprises a first end (124); and the first end is arranged to switch on the switch (150); characterized in that the first end is arranged to switch on the switch (150) by making impact with the switch (150) or a lever connected to the switch (150) for mechanically forced switching without flexible elements between the sliding weight and the detector.
  2. A wire rope hoist limiter device (100) according to claim 1, characterized in that the sliding weight (120) is fastened to the fastener (110) by means of a flexible fastener (130) such that the sliding of the sliding weight (120) further from the fastener (110) than the length of the flexible fastener (130) is prevented.
  3. A wire rope hoist limiter device (100) according to claim 1 or 2, characterized in that the detector is arranged to detect the sliding weight (120) at a certain distance from the fastener (110) on the basis of the force of the wire rope hoist such that the wire rope hoist generates a force transmitted to the switch.
  4. A wire rope hoist limiter device (100) according to claim 2, characterized in that : the detector (150, 160) is arranged to detect the sliding weight (120) at a certain distance from the fastener (110) even if the flexible fastener breaks.
  5. A wire rope hoist limiter device (100) according to claim 2 or 4, characterized in that the flexible fastener (130) comprises one or more of the following: a cable, rope, wire cable, band, tension spring.
  6. A wire rope hoist limiter device (100) according to any of the preceding claims, characterized in that the detection means (160) comprise a contact arrangement.
  7. A wire rope hoist limiter device (100) according to any of the preceding claims, characterized in that the sliding weight (120) consists of at least two parts attached to each another with an opening (122) between them in which the wire rope (10) of the wire rope hoist is arranged to run.
  8. A wire rope hoist limiter device (100) according to any of the preceding claims, characterized in that the fastener (110) is arranged to fasten to the wire rope (10) of the wire rope hoist by pressing.
  9. A wire rope hoist limiter device (100) according to any of the preceding claims, characterized in that the fastener (110) is made of at least two parts which are arranged to be attached to each other such that the wire rope (10) of the wire rope hoist is pressed in the opening (112) remaining between the parts.
  10. A wire rope hoist limiter device (100) according to any of the preceding claims, characterized in that the fastener (110) is arranged to be fastened to different sizes of wire ropes by providing various sizes of openings (112).
  11. A wire rope hoist control system, characterized in that the control system comprises a limiter device (100) according to any of the preceding claims.
  12. A wire rope hoist control system according to claim 11, characterized in that the wire rope hoist control system further comprises automatic control for controlling the wire rope hoist.
  13. A method for providing the wire rope hoist with a limiter device, characterized in that a limiter device (100) according to any of the claims 1-10 is mounted on the wire rope hoist.

Description

FIELD OF THE INVENTION The invention relates to a wire rope hoist limiter device, a wire rope hoist control system, a wire rope hoist limiter system and a method for providing the wire rope hoist with a limiter device. The invention relates especially to a wire rope hoist limiter device adaptable for mounting on different types of wire hoists. BACKGROUND This section provides the reader with useful background information without necessarily intending to admit as prior art the technique described herein. When operating a wire rope hoist, mechanisms are employed which limit the maximum height to which a load can be hoisted in a significantly vertical movement. These mechanisms ensure that the load will not damage the structures of the wire rope hoist. In some countries, the limiter mechanisms are also compulsory. In addition to the significantly vertical movement, for example, bridge cranes are controlled horizontally by moving the trolley or the bridge, each on its own rails. The hoist is generally fastened to the trolley, said trolley comprising a rope drum and a rope end termination for winding and fastening the wire rope. The hoist may also be located on a jib. The jib may be a crane rotating about the vertical axis or a non-rotating fixedly mounted crane. Previously there is known a limiter mechanism, in which an element triggering the limiter device is mounted on the roping of the wire rope hoist. However, the previously known mechanism requires a specific type of roping, and parts of the limiter device are mounted on structures of the wire rope hoist, which must be adapted to this. This type of a known limiter device is disclosed in the patent publication US 8,657,134 B2. All wire rope hoists do not have sufficient backup for situations where one of the limiter mechanisms fails or no limiter mechanisms have been installed. There is thus a need for a limiter device which is simple to mount on different types of wire rope hoists, also afterwards, and which does not require a specific type of roping or of a wire rope hoist structure. CN 206417804 U and JP H01106496 U disclose crane hook hoisting limiters with rope attachments. The object of the present invention is to provide such a limiter device. SUMMARY According to a first aspect of the invention, a wire rope hoist limiter device according to accompanying claim 1 is provided. The sliding weight may be fastened to the fastener by means of a flexible fastener such that the sliding of the sliding weight beyond the length of the flexible fastener is prevented. The flexible fastener may comprise one or more of the following: a cable, a wire rope, a rope, a band, a tension spring. The detection means may comprise a sensor arrangement which is mechanical, or other mechanical arrangement arranged at a certain distance from the fastener to detect the sliding weight. The sliding weight may consist of at least two parts attached to each other with an opening between them in which the wire rope of the wire rope hoist is arranged to run. The fastener may be arranged to fasten on the wire rope of the wire rope hoist by pressing. The fastener may be made of at least two parts which are arranged to be attached to each other such that the wire rope of the wire rope hoist is pressed in the opening remaining between the parts. The fastener may be arranged to be fastened to different sizes of wire ropes by providing various sizes of openings. The sliding weight may be shaped such that its first end facing the fastener is narrower than a second end. The sliding weight may comprise at least one rotationally symmetrical end, the axis of symmetry of which is parallel with the wire rope. The sliding weight may be arranged to move guided by the wire rope of the wire rope hoist such that the detector detects the sliding weight at a certain distance from the detector, directly from the sliding weight. The flexible fastener can determine the idle distance of the sliding weight from the detector when the sliding weight rests on the flexible fastener. The idle distance may be greater than the said certain distance from the detector at which the detector is arranged to detect the sliding weight. The idle distance may be a freely selected distance which is greater than the said certain distance from the detector at which the detector is arranged to detect the sliding weight. The flexible fastener may be arranged to connect the sliding weight to the fastener such that the flexible fastener settles over at least a part of the free space between the fastener and the sliding weight on a route independent of the wire rope of the wire rope hoist. The route may change its shape as the sliding weight rises. The external parts of the detection means may be arranged to maintain their dimensions when the sliding weight moves from its rest position to the said certain distance. According to a second aspect of the invention, a wire rope hoist control system is provided, which is characterized in