EP0667315B1 - Verfahren und Vorrichtung zur Lastmomentbegrenzung eines Turmdrehkrans - Google Patents
Verfahren und Vorrichtung zur Lastmomentbegrenzung eines Turmdrehkrans Download PDFInfo
- Publication number
- EP0667315B1 EP0667315B1 EP94113767A EP94113767A EP0667315B1 EP 0667315 B1 EP0667315 B1 EP 0667315B1 EP 94113767 A EP94113767 A EP 94113767A EP 94113767 A EP94113767 A EP 94113767A EP 0667315 B1 EP0667315 B1 EP 0667315B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- load
- measured
- load moment
- jib
- product
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/88—Safety gear
- B66C23/90—Devices for indicating or limiting lifting moment
- B66C23/905—Devices for indicating or limiting lifting moment electrical
Definitions
- the invention relates to a method for overload protection Tower crane, in which the load and position of the trolley measured and from the product of the load and resulting from the trolley position resulting throat is calculated the load moment and a corresponding overload protection.
- Tower cranes as is known from DE-A-27 38 307, must be equipped with an overload safety device or a load torque limitation be provided to the crane operator when approaching warns of an overload condition in good time or switch off the crane when the maximum permissible load torque is reached. Such overload protections are necessary to prevent damage to avoid crane construction and accidents.
- the hoisting rope force is known, for example, by a load measuring axis loaded with the lifting rope force, that with strain gauges is measured.
- redundant systems can be provided, for example from several strain gauges or from several sensors working in parallel exist.
- the Outreach i.e. the position of the trolley on the boom, can be measured by measuring the speed of the trolley drum or by other known measuring devices for detecting the length of the trolley rope between the trolley and the trolley winch. This then results from the product of load and overhang Load moment.
- Such a calculation of the load torque from the Product of outreach and load may be due to the failure of Sensors and transducers may be inaccurate. Because of Operational safety and to avoid accidents is the accurate recording of the load torque is essential.
- the object of the invention is therefore to provide a method for reliable To create detection of the load torque.
- this object is achieved in a method of the beginning specified type solved in that in addition immediately the load torque is measured and compared with the calculated product and when the permissible load torque is exceeded or at Deviation of the measured load torque from the product by one given value a signal is given.
- the method is not limited to the arrangement of redundant ones Sensors that all deliver incorrect values can, but the load torque is independent of each other measured two different methods, one immediately from the deformation of structural parts subjected to the load moment and secondly from the product of throat and load, so that comparing them independently measured values with high accuracy the current Determine the load moment or indicate that a system or both systems for recording and measuring the load torque are faulty is working.
- Deformation is expedient for measuring the load torque at least one corner arm of the boom tip and / or the Tension on the boom guy rope or boom guy linkage measured.
- the product calculated according to the load torque stands out according to the invention in that for measuring the load torque of the Boom the deformation of a corner arm of the boom tip or sensing the tension of the boom guy rope or boom Device is provided and that the computing unit with the calculated product directly compares the measured load torque and if the permissible load torque or a deviation from the calculated Load torque from the directly measured load torque by one emits a predetermined value.
- a monitor or a display device for displaying the measured and / or calculated values provided.
- a warning device is expediently provided, which a Output signal when approaching the maximum permissible load torque.
- the "overload" state is recognized and issued a corresponding warning signal.
- the The crane drives are switched off, and the crane can then move in be driven to its safe state.
- Fig. 1 is a tower crane 1 with the associated load curve evident.
- the load-unloading diagram has an area two constant load, that of the design-related maximum load corresponds. This range of constant load is up to one given projection is valid. With a larger throat takes then the permissible load according to the load curves shown from.
- a discharge sensor 3 is provided, which the projection 4, namely the position of the trolley 5th on the boom 6 of the tower crane 1 measures.
- This discharge sensor is of a known type and can be made with the trolley winch drum coupled tachometer or from a usual Length measuring device exist.
- the load 8 hanging on the hoisting rope 7 is replaced by a conventional one Load measuring axis 9 measured, which is loaded with the load and strain gauges having.
- the measured values are measured lines 12, 13, 14th fed to a central processing unit 15.
- the central rake15 calculated from the signals of the outreach and the load the product corresponding to the load moment.
- the central processing unit 15 forms from the measurement signal of the load torque sensor 10, the load torque. Both values are together compared, and in the event of an impermissible deviation these values from each other are given a signal.
- the central unit 15 generates a signal when the measured load moments result in values that are outside of those in the Central unit stored load curve for the respective crane type lie.
- the measured load torque deviates from the calculated load torque From or the "overload” state is recognized, the drives the crane is switched off, and the crane can then be placed in a safe Condition.
- the measured values of the load torque are displayed on a monitor or a display device 17 is displayed.
- the lowering depth of the load, the unloading by moving the trolley 5 and the boom rotation are based on a control panel, by a control lever 18 in the usual way controlled.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jib Cranes (AREA)
- Control And Safety Of Cranes (AREA)
Description
- Fig. 1
- eine Seitenansicht eines Turmdrehkrans mit zugehöriger Lastkurve und
- Fig. 2
- ein Blockbild der erfindungsgemäßen Überlastsicherung.
Claims (5)
- Verfahren zur Überlastsicherung eines Turmdrehkrans, bei dem die Last (8) und die Stellung der Laufkatze (5) gemessen und aus dem Produkt der Last (8) und der sich aus der Laufkatzenstellung ergebenden Ausladung (4) das Lastmoment errechnet wird,
dadurch gekennzeichnet,
daß zusätzlich unmittelbar das Lastmoment gemessen und mit dem errechneten Produkt verglichen und bei Überschreiten des zulässigen Lastmoments oder bei Abweichung des gemessenen Lastmoments von dem Produkt um einen vorgegebenen Wert ein Signal gegeben wird. - Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß zur Messung des Lastmoments die Verformung mindestens eines Eckstiels der Auslegerspitze (11) und/oder die Spannung des Auslegerabspannseils oder des Auslegerabspanngestänges gemessen werden.
- Überlastsicherung eines Turmdrehkrans (1) mit Einrichtungen (3,9) zur Messung der Last (8) und der Stellung der Laufkatze (5), und eine Recheneinheit (15), die aus der gemessenen Last (8) und der gemessenen Ausladung (4) das dem Lastmoment entsprechende Produkt errechnet
dadurch gekennzeichnet,
daß zur Messung des Lastmoments des Auslegers (6) eine die Verformung eines Eckstiels der Turmspitze (11) oder die Spannung des Auslegerabspannseils oder -gestänges erfassende Einrichtung (10) vorgesehen ist, und daß die Recheneinheit das errechnete Produkt mit dem unmittelbar gemessenen Lastmoment vergleicht und bei Überschreiten des zulässigen Lastmoments oder einer Abweichung des errechneten Lastmoments von dem unmittelbar gemessenen Lastmoment um einen vorgegebenen Wert ein Signal abgibt. - Überlastsicherung nach Anspruch 3, dadurch gekennzeichnet, daß ein Monitor oder eine Anzeigeeinrichtung (17) zur Darstellung der gemessenen und/oder errechneten Werte vorgesehen ist.
- Überlastsicherung nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß eine Warneinrichtung vorgesehen ist, die ein Signal bei Annäherung an das höchstzulässige Lastmoment abgibt.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4404107 | 1994-02-09 | ||
DE4404107 | 1994-02-09 | ||
DE4417608A DE4417608A1 (de) | 1994-02-09 | 1994-05-19 | Verfahren und Vorrichtung zur Lastmomentbegrenzung eines Turmdrehkrans |
DE4417608 | 1994-05-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0667315A1 EP0667315A1 (de) | 1995-08-16 |
EP0667315B1 true EP0667315B1 (de) | 1998-11-25 |
Family
ID=25933681
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94113767A Expired - Lifetime EP0667315B1 (de) | 1994-02-09 | 1994-09-02 | Verfahren und Vorrichtung zur Lastmomentbegrenzung eines Turmdrehkrans |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0667315B1 (de) |
ES (1) | ES2123695T3 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015171409A1 (en) * | 2014-05-05 | 2015-11-12 | The Crosby Group LLC | System and method of measurement, identification and analysis of material lifting products using remote monitoring |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202015001024U1 (de) | 2015-02-09 | 2016-05-10 | Liebherr-Werk Biberach Gmbh | Kran mit Überwachungsvorrichtung zum Überwachen der Überlastsicherung |
DE202015001023U1 (de) * | 2015-02-09 | 2016-05-10 | Liebherr-Components Biberach Gmbh | Kran |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2738307A1 (de) * | 1977-08-25 | 1979-03-08 | Koepp Elektronik Gmbh | Verfahren und vorrichtung zur elektronischen ermittlung und ueberwachung der arbeitsweise, belastung oder ueberlastung eines kranes |
DE2816536C2 (de) * | 1978-04-17 | 1983-06-23 | Wilhelm 5020 Frechen König | Kran mit einer Höchstlast- bzw. Lastmomenten-Sicherung |
US4752012A (en) * | 1986-08-29 | 1988-06-21 | Harnischfeger Corporation | Crane control means employing load sensing devices |
-
1994
- 1994-09-02 ES ES94113767T patent/ES2123695T3/es not_active Expired - Lifetime
- 1994-09-02 EP EP94113767A patent/EP0667315B1/de not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015171409A1 (en) * | 2014-05-05 | 2015-11-12 | The Crosby Group LLC | System and method of measurement, identification and analysis of material lifting products using remote monitoring |
Also Published As
Publication number | Publication date |
---|---|
EP0667315A1 (de) | 1995-08-16 |
ES2123695T3 (es) | 1999-01-16 |
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