EP2313336A1 - Frühzeitige überlasterkennung für eine lasthubvorrichtung - Google Patents
Frühzeitige überlasterkennung für eine lasthubvorrichtungInfo
- Publication number
- EP2313336A1 EP2313336A1 EP09777882A EP09777882A EP2313336A1 EP 2313336 A1 EP2313336 A1 EP 2313336A1 EP 09777882 A EP09777882 A EP 09777882A EP 09777882 A EP09777882 A EP 09777882A EP 2313336 A1 EP2313336 A1 EP 2313336A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- load
- signal
- threshold
- overload
- spreader
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001514 detection method Methods 0.000 title abstract description 4
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000012544 monitoring process Methods 0.000 claims abstract description 11
- 230000001052 transient effect Effects 0.000 claims description 9
- 230000004224 protection Effects 0.000 claims description 6
- 230000007257 malfunction Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 15
- 238000010586 diagram Methods 0.000 description 13
- 230000035484 reaction time Effects 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 210000001015 abdomen Anatomy 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C15/00—Safety gear
- B66C15/06—Arrangements or use of warning devices
- B66C15/065—Arrangements or use of warning devices electrical
Definitions
- the present invention relates to a method for dynamically detecting a dangerous operation of a load lifting device, in particular a container crane, wherein the load lifting device has at least one force sensor, which cooperates with a load receiving means.
- the present invention further relates to a crane with an overload protection according to the invention.
- a container spreader is described by way of example in WO 02/10056 A1.
- a container crane is described by way of example in DE 102 33 875 A1. These two applications are hereby expressly referred to, as far as the general structure of a spreader or a container crane is concerned.
- the conventional overload protection is also used to avoid a so-called "snag-load” condition.
- "Snag-load” means an unintentional increase in the load on the crane, eg by hooking the load or the spreader in one to be unloaded or loading vessel, whereby the load can then rise almost to infinity, concretely up to the maximum overload cut-off.
- the spreader or the container hanging from it can get caught on another container which, for example, protrudes opposite the container to be pulled up. If the container to be lifted is tilted as a result of this, the overload shutdown will not react until the rated load of the crane (eg 60 t) is exceeded.
- the crane pulls on the ship with a maximum of 60 t (in the event that no container hangs on the spreader) before it is even registered that the spreader is attached to the ship.
- the resulting forces must be intercepted either by a steel structure of the crane or the ship.
- an empty spreader ie a spreader without an attached load
- a reaction time of 30 ms corresponds to a hoist rope length of 15 cm.
- the object of the present invention is to further reduce the dangers, even with a constant reaction time.
- a load / time diagram is shown, wherein in the left part of the diagram, which is designated by the numeral 1 in a circle, a normal lifting operation is shown in overload shutdown. In the right part of the diagram, which is indicated by the number 2 in the circle, a lifting process is shown in which a "snag-load" state actually occurs.
- a lifting operation is shown in which an unwanted load increase (“snag load”) occurs
- snag load an unwanted load increase
- the load has been lifted (normal load case, parallel to the rising edge of the normal lifting operation)
- the load or the corresponding one increases
- the load may become jammed during operation of the container crane, for example, since a further load increase does not occur during normal operation, since the controller assumes that the drive is being carried out without further lifting
- This is detected by a conventional controller only when the measurement signal exceeds the predetermined overload threshold, in which case it takes some time until the measurement signal has even reached the overload threshold, so that the actual reaction time is delayed relatively long, which can result in damage to man and machine, since the crane then with Maxi maltraft pulls.
- FIG. 4 Another case design is shown in Fig. 4.
- the further case design results when lifting and / or moving a spreader without a load being attached.
- the spreader alone can be e.g. get caught inside the ship while moving.
- a normal travel of the spreader is shown in the left part of the diagram, wherein the measurement signal corresponds to the weight of an isolated spreader.
- the right part of the diagram shows a drive with a "snag-load" state.
- the present invention has therefore set itself the task of devising a solution to this problem.
- the present invention therefore proposes the following steps: defining a time required to lift the load handler, with or without additional load; Monitoring the signal during an increase for the defined period of time for an overload threshold to be exceeded; if the overload threshold is not exceeded during the defined period of time, determining a weighted average force from the signal, and determining the averaged weight force as the base load; Setting a dynamic jump threshold as the overload threshold greater than the base load and less than the nominal overload threshold; and monitoring the signal as to whether the signal becomes greater than or equal to the skip threshold, and generating the skip signal if the signal is greater than or equal to the skip threshold.
- the nominal overload threshold is statically defined, that is, an adaptation of the overload threshold to a prevailing situation does not occur.
- either the crane or the ship may be severely damaged, since it takes a relatively long time for the overload threshold to be reached and a shutdown to be initiated.
- the threshold is set dynamically, that is, the threshold is variable over time and can assume a value adapted to a particular prevailing situation.
- an average value corresponding to the weight of the spreader with or without an applied load is determined according to the present invention. For example, 30% of the value determined in this way can be used to define the dynamic "jump threshold.” If the signal from the force sensor jumps over this threshold, it is clear that the spreader has become caught and an emergency shutdown is required usually before the crane pulls on the spreader with maximum force Such situations can not only occur when lifting a load, but also during horizontal travel of the crane or a trolley below which the spreader hangs.
- the present invention is also capable of distinguishing between raising the spreader with load and raising the spreader without load or a "snag-load" condition as the jump threshold is adjusted dynamically when no load is attached to the spreader , the absolute value of the jump threshold is smaller than in the case when a load hangs on the spreader.
- the signal during a desired lifting operation passes through a transient phase, which is covered by the defined period of time, and the base load corresponds to an averaged value of the signal during the defined period of time.
- the base value for defining the dynamic jump threshold represents an average, so that the jump threshold is not determined based on extreme values during the transient process.
- a lifting mechanism of the load lifting device in particular a cable winch, is actuated during a signal rise.
- the query provides an additional source of information. If the lifting mechanism is not actuated and the load nevertheless increases, then it can be concluded that the spreader and / or the attached load (for example, containers) has become entangled, for example, during horizontal travel of the crane.
- a force sensor is associated with each corner of the container, which does not necessarily have to be arranged in the spreader.
- usually four force sensors (one for each hoist rope) are used.
- the sum of the measuring signals of the four force sensors corresponds to the total load (spreader plus container). Since each of the force sensors thus contributes to the determination of the total load, an individual overload value, which is smaller than the overload value of the overall system, can also be defined for each of the force sensors.
- a window can be defined in the load / time diagram within which the measurement signal may move during a transient when lifting a load. If the signal leaves the range defined by such a window, an emergency shutdown can occur relatively early in comparison to a conventional overload shutdown at a nominal overload value.
- the load handling means is operated at a speed of up to 300 m / min and the response time of detection is preferably less than or equal to 5 ms.
- the hoist rope length is 2.5 cm, around which the hoist rope is moved, although an emergency shutdown event has occurred.
- This Hubseilus is intercepted by the steel structure of the crane or the ship and usually does not damage the ship or the crane.
- the dynamic jump threshold is redetermined during each lifting operation.
- the calculations associated with the determination of the dynamic jump threshold can be performed permanently. This increases security.
- FIG. 1 shows a load / time diagram including overload thresholds, in particular the dynamic overload threshold according to the present invention
- FIG. 3 shows a load / time diagram with loaded spreader according to the prior art
- Fig. 4 is a load / time diagram with unloaded spreader according to the prior art.
- the present invention may be implemented by software and / or hardware.
- the inventors have come to the realization that emergency shutdowns when lifting loads or when moving loads compared to conventional emergency shutdowns that work with static overload thresholds can be performed faster and better by defining a dynamic overload threshold.
- a "dynamic" overload threshold is understood below to mean a variable value above which an emergency shutdown is initiated, regardless of whether the value is determined by the system or whether the value comes from a foreign source It makes no difference whether a spreader is moved alone, ie without load, or whether a spreader is moved with the load attached between raising the spreader when a load has just been attached and the spreader is to be raised, and pulling up the spreader when the load is already attached to the spreader can be clearly distinguished.
- the present invention is in load lifting devices, such as e.g. Container cranes, or other types of cranes, can be used.
- Force sensors are used to determine the loads hanging on the crane.
- a force sensor usually consists of a force transducer and a cooperating electrical measuring system, which converts the weight force into an electrical signal.
- measuring axes, measuring tabs, measuring boxes, etc. can be used as force sensors.
- strain gauges strain gauges
- the strain gauges can either be glued to the force transducer or applied with "sputtering" technology.
- the present invention is used in particular in connection with so-called spreaders in container cranes.
- a spreader serves as a gripping device for lifting, for example, containers.
- Force transducers such as measuring axes, are used to determine forces acting on hoisting ropes of the spreader. These measuring axles usually engage via the hoisting ropes in the corners of the spreader to be lifted. The sum of all measured signals represents the total load.
- the force sensors generate measurement signals, which are forwarded to a control device for determining a total weight. Based on these signals, it is also possible to determine side loads, overloads, slack signals, special load signals or side or tilt load errors or single rope load errors. To determine these different information or signals, the individual measurement signals of the force sensors are combined in different ways, as is already known to the person skilled in the art.
- a load / time diagram for a lifting operation is shown.
- the spreader is connected to the container.
- the container rests meanwhile on a base (floor / further container).
- a lifting operation is initiated by means of a lifting mechanism of the crane.
- the measurement signal rises from zero to a first (limited) maximum value, which represents a first measure of the weight of the container. This is shown in the left-hand part of the measuring curve of FIG. 1 denoted by a number 1 in the circle.
- a transient begins, which manifests itself by an oscillation of the signal about an average load value, which is indicated in FIG. 1 by means of a horizontal auxiliary line.
- the transient process stops.
- the measuring signal is then almost constant.
- the container can be moved and later dropped off. When the container is lowered, the measurement signal drops to zero.
- the transient decays slower or faster.
- the maximum weight of the item to be lifted is known. Knowing the weight of the object to be lifted, the duration of a lifting operation, at least approximately, can be specified in advance. In the right half of Fig. 1, a further lifting operation is shown. The duration of the lifting process is limited by two vertical auxiliary lines at the measuring curve marked with a number 2 in the circle.
- the duration of the lift-up operation can either be entered manually for each lift operation depending on the size of the load to be lifted in a control device according to the present invention.
- the duration of the lifting operation can also be predefined in the form of a parameter which is stored in a memory device of the control device. There are a variety of different parameters can be stored in order to adapt to different loads.
- the time window for the lifting operation is triggered.
- This trigger time corresponds in particular to the time at which the measurement signal is greater than zero.
- the measuring signal is recorded over the duration of the lifting process.
- an average is formed, which corresponds to the average load.
- the average load is also illustrated in the right part of Fig. 1 by means of a horizontal auxiliary line.
- a dynamic skip threshold denoted “dynamic snag load threshold” in Fig. 1
- the skip threshold may be 30% above the average load.
- the dynamic threshold is below an overload threshold of the total load. In the example of FIG. 1, this dynamic load is even far below the overall overload threshold.
- auxiliary line which is designated by "overload threshold corner points.”
- This auxiliary line illustrates the overload thresholds of the individual force sensors, which preferably act via the hoisting ropes in the corners of the spreader lower than the overall overload threshold.
- the load is monitored on the basis of the overload thresholds of the corner points as well as the load rising edges.
- a "snag-load” state is shown at the end of the right-hand measurement curve of Fig. 1.
- the container on the spreader may, for example, during another lifting operation (container is raised further after lifting) on another container still in the Because of this, the dynamic response threshold is much lower than the overall overload threshold, so the "snag-load” condition can be detected much earlier than the conventional approach.
- the "snag-load” condition is detected even before the overall overload threshold is reached, and the lifting operation is stopped by generating an emergency stop signal, in which case there is no harmful load on the crane or the vessel.
- the method according to the invention is shown by way of example in the form of a flow chart.
- a query is made as to whether there is basically a signal increase. This query does not distinguish whether the spreader is raised alone or with a load. If there is no load increase, the process returns to step S1. If there is a load increase, a query is made in a step S2 whether a predetermined time has expired. The predetermined period of time can either be entered manually or specified by querying a parameter database. If it is determined in the query of step S2 that the predetermined period of time has not yet elapsed, the system returns to step S2. With this query, the transient phenomena shown in FIG. 1 should be included.
- step S3 If the predetermined period of time has elapsed in step S2, it is asked in a step S3 whether the overload threshold has been exceeded during the time period.
- the query of step S3 can also take place in parallel to step S2.
- an emergency shutdown occurs, which is initiated by a higher-level control device in a step S4 by generating corresponding signals.
- a medium load (spreader / spreader plus container) is determined, from which in turn the "dynamic" jump threshold is determined All this is done in a step S5.
- this jump threshold is set as a "new" transition threshold in a step S6. If there was already a jump threshold, the new value is defined as a "new" transition threshold.
- a query S7 is checked whether the lifting process is completed. When finished, the overload monitoring according to the present invention is terminated. If the lifting has not been completed, return to step S1.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control And Safety Of Cranes (AREA)
- Jib Cranes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200810045330 DE102008045330B4 (de) | 2008-08-20 | 2008-08-20 | Frühzeitige Überlasterkennung für eine Lasthubvorrichtung |
PCT/EP2009/005907 WO2010020378A1 (de) | 2008-08-20 | 2009-08-14 | Frühzeitige überlasterkennung für eine lasthubvorrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2313336A1 true EP2313336A1 (de) | 2011-04-27 |
EP2313336B1 EP2313336B1 (de) | 2015-04-01 |
Family
ID=41137665
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09777882.3A Active EP2313336B1 (de) | 2008-08-20 | 2009-08-14 | Frühzeitige überlasterkennung für eine lasthubvorrichtung |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2313336B1 (de) |
KR (1) | KR101625248B1 (de) |
CN (1) | CN102123935B (de) |
DE (1) | DE102008045330B4 (de) |
WO (1) | WO2010020378A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020088879A1 (de) | 2018-10-29 | 2020-05-07 | Pintsch Bubenzer Gmbh | Bremsanordnung zur sicherung einer fördereinrichtung, fördereinrichtung und krananlage |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014110060A1 (de) | 2014-07-17 | 2016-01-21 | Terex Mhps Gmbh | Füllgradsteuerung für einen Schüttgut-Greifer eines Krans |
CN105293279A (zh) * | 2015-11-18 | 2016-02-03 | 德马科起重机械有限公司 | 一种起重机电动小车及使用该小车的起重机 |
DE102017126182B4 (de) | 2017-11-09 | 2023-01-19 | Brosa Ag | Kraftmessvorrichtung mit Dynamikkompensation |
CN109732628A (zh) * | 2018-12-26 | 2019-05-10 | 南京熊猫电子股份有限公司 | 机器人末端智能抓取控制装置及其智能抓取方法 |
DE102022120407A1 (de) | 2022-08-12 | 2024-02-15 | Arburg Gmbh + Co Kg | Verfahren zur Fehlererkennung, Fehlererkennungsvorrichtung und Computerprogrammprodukt |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5189605A (en) | 1989-10-10 | 1993-02-23 | The Manitowoc Company, Inc. | Control and hydraulic system for a liftcrane |
US5597080A (en) * | 1994-08-02 | 1997-01-28 | Kranco Crane Services, Inc. | Snag load protection system for a crane |
DE19645812C1 (de) * | 1996-11-07 | 1998-02-26 | Stahl R Foerdertech Gmbh | Steuerungsanordnung mit Erkennung des Gewichts der Last |
DE60029018T2 (de) | 2000-04-24 | 2007-06-14 | Nsl Engineering Pte.Ltd. | Ladegeschirr |
EP1441974A1 (de) | 2000-07-27 | 2004-08-04 | Hermann Kruse | Container-spreader und container hierfür |
DE10233875B4 (de) | 2002-07-25 | 2008-08-14 | Siemens Ag | Krananlage, insbesondere Containerkran |
DE10304951A1 (de) | 2003-02-06 | 2004-08-26 | Eko Stahl Gmbh | Verfahren und Einrichtung zur Fehllasterkennung an Brückenkranen |
US7353959B2 (en) | 2004-08-03 | 2008-04-08 | Mi-Jack Products, Inc. | Variable-speed load-dependent drive and hoist system |
-
2008
- 2008-08-20 DE DE200810045330 patent/DE102008045330B4/de active Active
-
2009
- 2009-08-14 WO PCT/EP2009/005907 patent/WO2010020378A1/de active Application Filing
- 2009-08-14 CN CN200980132319.7A patent/CN102123935B/zh active Active
- 2009-08-14 KR KR1020117004798A patent/KR101625248B1/ko active IP Right Grant
- 2009-08-14 EP EP09777882.3A patent/EP2313336B1/de active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2010020378A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020088879A1 (de) | 2018-10-29 | 2020-05-07 | Pintsch Bubenzer Gmbh | Bremsanordnung zur sicherung einer fördereinrichtung, fördereinrichtung und krananlage |
Also Published As
Publication number | Publication date |
---|---|
KR20110044268A (ko) | 2011-04-28 |
CN102123935B (zh) | 2013-10-09 |
CN102123935A (zh) | 2011-07-13 |
WO2010020378A1 (de) | 2010-02-25 |
KR101625248B1 (ko) | 2016-05-27 |
DE102008045330A1 (de) | 2010-04-22 |
DE102008045330B4 (de) | 2013-03-21 |
EP2313336B1 (de) | 2015-04-01 |
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