DE3836371A1 - Hydraulic drive device for loop lifters - Google Patents
Hydraulic drive device for loop liftersInfo
- Publication number
- DE3836371A1 DE3836371A1 DE19883836371 DE3836371A DE3836371A1 DE 3836371 A1 DE3836371 A1 DE 3836371A1 DE 19883836371 DE19883836371 DE 19883836371 DE 3836371 A DE3836371 A DE 3836371A DE 3836371 A1 DE3836371 A1 DE 3836371A1
- Authority
- DE
- Germany
- Prior art keywords
- piston
- drive device
- hydraulic drive
- loop lifter
- lifter according
- 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
- 230000007480 spreading Effects 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 abstract 2
- 238000005259 measurement Methods 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 description 3
- 238000013016 damping Methods 0.000 description 3
- 230000036316 preload Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
- F15B11/036—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of servomotors having a plurality of working chambers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B41/00—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters
- B21B41/08—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters without overall change in the general direction of movement of the work
- B21B41/10—Loop deflectors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B41/00—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters
- B21B41/12—Arrangements of interest only with respect to provision for indicating or controlling operations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
- F15B11/036—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of servomotors having a plurality of working chambers
- F15B11/0365—Tandem constructions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
- F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
- F15B2211/214—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being hydrotransformers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check valves
- F15B2211/30515—Load holding valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3056—Assemblies of multiple valves
- F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3138—Directional control characterised by the positions of the valve element the positions being discrete
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3144—Directional control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/35—Directional control combined with flow control
- F15B2211/351—Flow control by regulating means in feed line, i.e. meter-in control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/35—Directional control combined with flow control
- F15B2211/353—Flow control by regulating means in return line, i.e. meter-out control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
- F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/625—Accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/6306—Electronic controllers using input signals representing a pressure
- F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7051—Linear output members
- F15B2211/7055—Linear output members having more than two chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/76—Control of force or torque of the output member
Abstract
Description
Die Erfindung betrifft eine hydraulische Antriebsvorrichtung für Schlingenheber in einer kontinuierlich betriebenen Band straße, wobei die Antriebsvorrichtung verschwenkbar gelagert ist und an einem Hebelarm eines als zweiarmigen Hebel ausge bildeten Schlingenhebers angelenkt ist sowie eine Steuerung für diesen Antrieb.The invention relates to a hydraulic drive device for loop lifters in a continuously operated band street, the drive device being pivotally mounted is and on a lever arm one out as a two-armed lever formed loop lifter is articulated as well as a control for this drive.
Beim kontinuierlichen Betrieb von Bandstraßen wird ange strebt, daß zwischen den einzelnen Gerüsten kein Zug ent steht. Die einzelnen Gerüste sind jedoch nicht so genau regelbar, daß zwischen den Gerüsten immer wieder Zugspannun gen auftreten. Um den Zug zwischen zwei Gerüsten meesen zu können, werden Schlingenheber eingesetzt, die mit einer bestimmten Kraft gegen das Band gedrückt werden, und deren Auslenkung ein Maß für den Zug zwischen den Gerüsten dar stellt.Continuous operation of belt lines is used strives to ensure that there is no train between the individual scaffolds stands. However, the individual scaffolds are not as precise adjustable so that tension between the scaffolds is repeated gene occur. To sea the train between two scaffolds can, loop lifters are used with a certain force are pressed against the tape, and their Deflection is a measure of the tension between the scaffolding poses.
Es sind bereits elektrisch betriebene Schlingenheber be kannt, deren Nachteile jedoch darin liegen, daß die ver hältnismäßig großen Massen nur zu langsam bewegt werden können und daß dadurch der Schlingenheber bei schnellen Zugänderungen zu träge nachgeführt wird. Es wurden auch pneumatisch angetriebene Schlingenhebel vorgeschlagen, die jedoch durch die Komprimierbarkeit der Luft zu weich arbei ten und unkontrolliert ansprechen. Im Ansprechverhalten sind diese pneumatisch betriebenen Schlingenheber ebenfalls langsam.There are already electrically operated loop lifters knows, the disadvantages of which are that the ver relatively large masses are moved too slowly can and that thereby the loop lifter at fast Train changes too slow is tracked. It was too pneumatically powered sling levers suggested that however, it is too soft due to the compressibility of the air and address uncontrolled. Are responsive these pneumatically operated loop lifters as well slowly.
Es wurde auch schon vorgeschlagen, Schlingenheber mit einem hydraulischen Antrieb zu versehen. Dabei hat es sich jedoch herausgestellt, daß die bei unterschiedlichen Bandquer schnitten unterschiedlichen Kräften von den bekannten hy draulischen Schlingenhebern nicht optimal aufgebracht werden können. Diese Schlingenheber müssen auf die maximal aufzu bringende Kraft ausgelegt werden. Bei den kleinsten aufzu bringenden Kräften ist das System derart überdimensioniert, daß Reibungen von Kolben-Zylinder-Einheiten und Ventilen derart ins Gewicht fallen, daß die Anlage bei den kleinen erforderlichen Drücken nicht mehr optimal betreibbar ist. Hinzu kommt, daß die Servoventile sehr weich zugefahren werden, um den Systemdruck entsprechend den kleinen notwen digen Kräften zu mindern, so daß am hydraulischen Zylinder zwar der entsprechende Druck ansteht, ein genügend großer Durchfluß durch das Ventil jedoch nicht gewährleistet ist, so daß auch dieser Zylinder nur sehr langsam schnellen Zug änderungen im Bande folgen kann.It has also been suggested to use a loop lifter hydraulic drive. But it did pointed out that at different band cross cut different forces from the well-known hy draulic loop lifters are not optimally applied can. These sling lifters need to reach the maximum bringing force be interpreted. To open with the smallest bringing forces, the system is so oversized that friction of piston-cylinder units and valves are so important that the investment in the small required pressures can no longer be operated optimally. In addition, the servo valves are closed very softly system pressure according to the small requirements reduce forces, so that on the hydraulic cylinder the pressure is high enough Flow through the valve is not guaranteed, so that this cylinder too very slow fast train changes in the band can follow.
Der Erfindung liegt die Aufgabe zugrunde, eine hydraulische Antriebsvorrichtung für Schlingenheber dahingehend zu ver bessern, daß auch bei unterschiedlichen Bandquerschnitten der Schlingenheber jeweils optimal betrieben werden kann.The invention has for its object a hydraulic To drive device for loop lifter ver improve that even with different belt cross-sections the loop lifter can be operated optimally.
Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß eine Tandem-Kolben-Zylinder-Einheit vorgesehen ist, deren beide Kolben über selektiv steuerbare Ventile beaufschlagbar sind, und daß die beiden Kolben miteinander koppelbar sind. According to the invention, this object is achieved in that a Tandem piston-cylinder unit is provided, both of which Pistons can be acted on by selectively controllable valves, and that the two pistons can be coupled together.
Dadurch wird erreicht, daß bei kleinen erforderlichen Kräf ten lediglich eine Kolben-Zylinder-Einheit wirksam werden muß. Werden jedoch große Kräfte, z.B. bei großen Bandquer schnitten verlangt, so sind beide Kolben-Zylinder-Einheiten beaufschlagbar und damit wirksam.This ensures that when small forces are required only a piston-cylinder unit take effect got to. However, if large forces, e.g. with large band cross cuts are required, so are both piston-cylinder units actable and therefore effective.
Bei hohem dynamischen Richtungswechsel im Betrieb der An triebsvorrichtung mit beiden Zylindern muß verhindert wer den, daß der Kraftschluß zwischen den Kolben des vorderen zur Kolbenstange des hinteren Zylinders unterbrochen wird. Dazu hat es sich bewährt, daß die beiden Kolben hydraulisch gegeneinander vorspannbar sind. Ein geschlossener Kraftfluß wird auch erreicht, wenn die beiden Kolben mechanisch kop pelbar ausgeführt werden, oder wenn die Kolben fest mitein ander gekoppelt sind.With a high dynamic change of direction during operation of the An Drive device with both cylinders must be prevented who that the frictional connection between the pistons of the front to the piston rod of the rear cylinder is interrupted. For this purpose, it has been proven that the two pistons are hydraulic are biased against each other. A closed flow of power is also achieved when the two pistons mechanically cop can be carried out or if the pistons are firmly together are coupled.
Von Vorteil ist, wenn die beiden Kolben-Zylinder-Einheiten eine gemeinsame Kolbenstange aufweisen, mit der ein Kolben fest verbunden ist und die in den zweiten Kolben lösbar einrastbar ist, daß die Kolbenstange an ihrem, auf den losen Kolben weisenden Ende federbeaufschlagbare Spreizsegmente aufweist, die den Kolben in gespreizter Stellung zwischen ihren Anschlägen und einem Anlagebund der Kolbenstange zu arretieren vermögen, und daß ein Entkoppelkolben vorgesehen ist, der einen Rohransatz aufweist, welcher über die Spreiz segmente schiebbar diese entspreizend zu bewegen vermag.It is advantageous if the two piston-cylinder units have a common piston rod with which a piston is firmly connected and releasable in the second piston It can be locked that the piston rod on her, on the loose Piston-pointing end of spring-loaded expansion segments has the piston in the spread position between their stops and a collar of the piston rod can lock and that a decoupling piston is provided is, which has a tube extension which over the spread slidable segments can move these despread.
Dadurch läßt sich ein leichtes Lösen des Kolbens von seiner Kolbenstange erreichen.This allows the piston to be easily detached from it Reach the piston rod.
Es hat sich bewährt, daß jede der beiden Kolben-Zylinder- Einheiten über steuerbare Rückschlagventile einzeln bzw. gemeinsam ansteuerbar ist. Bei fest verbundenen Kolben muß gewährleistet sein, daß bei Beaufschlagung nur eines Kolbens der zweite Kolben im Leerlauf bzw. auf einem Dämpfungsspei cher arbeitet.It has been proven that each of the two piston-cylinder Units via controllable check valves individually or can be controlled together. With firmly connected pistons be guaranteed that when only one piston is loaded the second piston is idling or on a damping shaft cher works.
Bemerkenswert ist, daß die Kolben-Zylinder-Einheiten über zwei parallele Servoventile mit einem Druckspeicher verbind bar sind, und daß die beiden Servoventile unterschiedliche I/Q-Charakteristiken aufweisen.It is noteworthy that the piston-cylinder units are about Connect two parallel servo valves to a pressure accumulator bar, and that the two servo valves are different Have I / Q characteristics.
Die unterschiedlichen I/Q-Charakteristiken bewirken, daß die Ventile in elektrischer Ablöseschaltung angesteuert werden, d.h. im kleinen Signalbereich bis ca. 80% elektrischem Sig nalstrom arbeitet nur ein Ventil. Erfolgt ein Stellbefehl der über 80% liegt, so wirkt das zweite Ventil analog mit. Damit wird erreicht, daß kleine Stellsignale mit einem klei nen Ventil sehr genau ausgeführt werden, während große Stellsignale einen großen Durchfluß bewirken und damit eine schnelle Reaktion des Schlingenhebers erreicht wird.The different I / Q characteristics cause the Valves are actuated in the electrical release circuit, i.e. in the small signal range up to approx. 80% electrical sig nalstrom only operates one valve. A command is given which is over 80%, the second valve works in the same way. This ensures that small control signals with a small NEN valve can be run very accurately while large Control signals cause a large flow and thus a quick reaction of the sling lifter is achieved.
Werden kleine Kräfte am Schlingenheber verlangt, so würde über die Servoventile ein sehr hoher Druckabfall entstehen. Um diesen hohen Druckabfall zu vermindern, läßt sich durch ein Druckminderventil der Systemdruck herabsetzen. Dadurch kommen die Servoventile in einen besseren Bereich ihrer Regelcharakteristik; d.h. die Servoventile arbeiten dann nicht im fast vollständig geschlossenen Zustand.If small forces are required on the sling lifter, it would there is a very high pressure drop across the servo valves. In order to reduce this high pressure drop, a pressure reducing valve reduce the system pressure. Thereby the servo valves come into a better range of theirs Control characteristics; i.e. the servo valves then work not in the almost completely closed state.
Weitere zweckmäßige Ausgestaltungen der erfindungsgemäßen Antriebsvorrichtung ergeben sich durch die weiterbildenden Ansprüche 2 bis 4.Further expedient configurations of the invention Drive device result from the continuing education Claims 2 to 4.
Die Erfindung wird anhand der Beschreibung einer Zeichnung erläutert. Dabei zeigen The invention is based on the description of a drawing explained. Show
Fig. 1 eine schematische Darstellung des erfindungsgemäßen Schlingenheber-Antriebs mit der entsprechenden Steuerung, Fig. 1 is a schematic representation of the looper drive according to the invention with the appropriate control,
Fig. 1a und 1b die Charakteristik der beiden Servo ventile, Fig. 1a and 1b valves the characteristics of the two servo,
Fig. 2 einen Tandemzylinder mit mechanischer Verriege lung, Fig. 2 lung a tandem cylinder with mechanical INTERLOCKS,
Fig. 3 den Koppelmechanismus für den Tandemzylinder, wobei der untere Halbschnitt den Kolben in gekoppelter Stellung und der obere Halbschnitt den Kolben in entkoppelter Stellung zeigt, und Fig. 3 shows the coupling mechanism for the tandem cylinder, the lower half section showing the piston in the coupled position and the upper half section showing the piston in the decoupled position, and
Fig. 4 eine weitere Ausgestaltung der Steuerung nach Fig. 1. Fig. 4 shows a further embodiment of the control of FIG. 1.
Der Fig. 1 sind die Walzen 1, 1′ zweier hintereinander ange ordneter Walzgerüste entnehmbar. Zwischen den Walzen 1, 1, ist ein Walzband 2 mit einer unterschiedlich groß angedeu teten Schlinge 3 gezeigt. Die Walzbandschlinge 3 ist von einem Schlingenheber 4 untergriffen. Der Schlingenheber 4 wird von einer Tandem-Kolben-Zylinder-Einheit 5 angetrieben, die am Gelenk 6 schwenkbar gelagert ist. Bei den Kolben-Zy linder-Einheiten 5′, 5′′ handelt es sich jeweils um doppelt wirkende Kolben-Zylinder-Einheiten, die unterschiedlich große Zylinderräume aufweisen. Fig. 1, the rollers 1 , 1 'two consecutively arranged roll stands can be removed. Between the rolls 1 , 1 , a rolled strip 2 is shown with a different size indicated loop 3 . The rolled strip loop 3 is gripped by a loop lifter 4 . The loop lifter 4 is driven by a tandem piston-cylinder unit 5 , which is pivotably mounted on the joint 6 . The piston-cylinder units 5 ', 5 ''are each double-acting piston-cylinder units that have different sized cylinder spaces.
Am Punkt 7 und am Druckbehälter 8 steht der Systemdruck an. Über ein Druckminderventil 9 läßt sich der Systemdruck be liebig drosseln. Am Druckbehälter 10 steht somit der ent sprechend gedrosselte Systemdruck an. Über das Ventil 11 läßt sich der Systemdruck bzw. der gedrosselte Systemdruck auf die Servoventile 12 und 13 schalten.The system pressure is present at point 7 and at pressure vessel 8 . The system pressure can be throttled arbitrarily via a pressure reducing valve 9 . At the pressure vessel 10 is therefore the throttled system pressure accordingly. The system pressure or the throttled system pressure can be switched to the servo valves 12 and 13 via the valve 11 .
Das Servoventil 12 weist die in der Fig. 1a und das Servo ventil 13 weist die in der Fig. 1b wiedergegebene I/Q-Cha rakteristik auf. Über die Servoventile 12, 13 gelangt der Systemdruck bzw. der gedrosselte Systemdruck auf die Kolben- Zylinder-Einheiten 5′, 5′′. Die Kolben-Zylinder-Einheit 5′′ ist über steuerbare Rückschlagventile 14, 14′ von der Druck leitung trennbar. Auf der jeweils vom Systemdruck nicht beaufschlagten Seite der Kolben-Zylinder-Einheit 5′, 5′′ bewirkt ein Druckvorspannventil 15 eine leichte Vorspannung der Kolben gegeneinander. Druckaufnehmer 16, 16′, 16′′, 16′′′ liefern den Druck-Istwelt für die Regelung der Servo ventile 12, 13.The servo valve 12 has the in Fig. 1a and the servo valve 13 has the I / Q-Cha reproduced in Fig. 1b characteristic. Via the servo valves 12 , 13 , the system pressure or the throttled system pressure reaches the piston-cylinder units 5 ', 5 ''. The piston-cylinder unit 5 '' can be separated from the pressure line via controllable check valves 14 , 14 '. On the side of the piston-cylinder unit 5 ', 5 ''which is not acted upon by the system pressure, a pressure preload valve 15 causes the pistons to be slightly preloaded against one another. Pressure transducers 16 , 16 ', 16 '', 16 ''' deliver the actual pressure for the control of the servo valves 12 , 13th
Im folgenden wird die Funktion der Antriebsvorrichtung be schrieben. Entsprechend dem Querschnitt des Bandes 2 können über ein Ventil 17 die Rückschlagventile 14 auf Sperren gesteuert werden, so daß nur noch die Kolben-Zylinder-Ein heit 5′ vom Druck beaufschlagt wird. Nach Wahl eines für den Bandquerschnitt günstigen Systemdrucks und der Anzahl der zu beaufschlagenden Kolben-Zylinder-Einheiten 5 wird der Schlingenheber 4 mit konstanter Kraft gegen das Band 2 ge drückt. Verändert sich der Zug im Band 2, so wird die Schlinge 3 größer bzw. kleiner. Dadurch fällt bzw. steigt die Kraft des Schlingenhebers 4 auf das Band 2. Das hat wiederum eine Druckänderung zur Folge, welche über die Druckaufnehmer 16 bis 16′′′ erkannt wird. Über einen nicht gezeigten Regelkreis, in dem die von den Druckaufnehmern 16 bis 16′′′ ermittelten Drücke mit entsprechenden Sollwerten verglichen werden, werden die Servoventile 12 und 13 ange steuert, die auf den Solldruck und damit auch die entspre chende konstante Kraft regeln.In the following the function of the drive device will be described. According to the cross section of the band 2 , the check valves 14 can be controlled on locks via a valve 17 , so that only the piston-cylinder unit 5 'is acted upon by the pressure. After choosing a system pressure favorable for the band cross-section and the number of piston-cylinder units 5 to be acted upon, the loop lifter 4 is pressed with constant force against the band 2 . If the tension in band 2 changes, the loop 3 becomes larger or smaller. As a result, the force of the loop lifter 4 falls or increases on the belt 2 . This in turn results in a change in pressure, which is detected via the pressure transducers 16 to 16 '''. Via a control circuit, not shown, in which the pressures determined by the pressure sensors 16 to 16 '''are compared with corresponding target values, the servo valves 12 and 13 are controlled, which regulate the target pressure and thus the corresponding constant force.
Kleine von den Druckaufnehmern 16 bis 16′′′ ermittelte Druckänderungen haben auch kleine Regelströme zur Folge, die nach der in Fig. 1a gezeigten Charakteristik nur Verstel lungen des Servoventiles 12 zur Folge haben. Erst bei größe ren Regelströmen wird das Servoventil 13 (siehe Charakteri stik Fig. 1b) aufgesteuert.Small pressure changes 16 to 16 '''determined by the pressure transducers also result in small control currents which, according to the characteristic shown in FIG. 1a, only result in adjustments of the servo valve 12 . Only with larger control currents, the servo valve 13 (see characteristics Fig. 1b) is turned on.
Fig. 2 zeigt die Tandem-Kolben-Zylinder-Einheit 5, bei der die Kolben 18 und 19 über eine mechanische Verriegelung miteinander verbindbar sind, so daß das Vorspannventil 15 in der hydraulischen Schaltung entfallen kann. Fig. 2 shows the tandem piston-cylinder unit 5 , in which the pistons 18 and 19 can be connected to one another via a mechanical lock, so that the preload valve 15 can be omitted in the hydraulic circuit.
Der Kolben 18 sitzt fest auf der Kolbenstange 20, die in den Zylinderraum der Kolben-Zylinder-Einheit 5′′ hineinreicht. Am Ende der Kolbenstange 20 ist ein Koppelmechanismus vorge sehen, über den der Kolben 19 mit der Kolbenstange 20 lösbar verbindbar ist. Über den Entkoppelkolben 21 läßt sich der Kolben 19 von der Kolbenstange 20 lösen.The piston 18 is firmly seated on the piston rod 20 , which extends into the cylinder space of the piston-cylinder unit 5 ''. At the end of the piston rod 20 , a coupling mechanism is provided, via which the piston 19 can be releasably connected to the piston rod 20 . The piston 19 can be detached from the piston rod 20 via the decoupling piston 21 .
Fig. 3 läßt in der unteren Hälfte erkennen, daß der Kolben 19 zwischen einem Anlagebund 22 der Kolbenstange 20 und Anschlägen der Spreizsegmente 23 fest auf der Kolbenstange 20 sitzt. Der Entkoppelkolben 21 ist in die Entkoppelstel lung gefahren. Der Entkoppelkolben 21 weist einen Rohransatz 24 auf, der beim Einfahren der Kolbenstange 20 in denselben bewirkt, daß die Spreizsegmente 23 gegen eine Federkraft entspreizt werden. In dieser Stellung läßt sich die Kolben stange 20 aus dem Kolben 19 herausziehen. Fig. 3 shows in the lower half that the piston 19 is firmly seated on the piston rod 20 between a contact collar 22 of the piston rod 20 and stops of the expansion segments 23 . The decoupling piston 21 has moved into the decoupling position. The decoupling piston 21 has a tubular extension 24 which , when the piston rod 20 is retracted therein, causes the expansion segments 23 to be expanded against a spring force. In this position, the piston rod 20 can be pulled out of the piston 19 .
Die obere Hälfte der Fig. 3 zeigt die Tandem-Kolben-Zylin der-Einheit vor dem Koppelvorgang. Der Entkoppelkolben 21 ist mit seinem Rohransatz 24 außer Wirkstellung gefahren. Fährt die Kolbenstange 20 bei dieser Stellung des Entkoppel kolbens 21 in den Kolben 19 ein, so werden die Spreizseg mente 23 vom Kolben 19 entspreizt, können sich jedoch hinter dem Kolben 19 wieder spreizen, so daß dieser fest auf der Kolbenstange 20 sitzt.The upper half of Fig. 3 shows the tandem piston-cylinder unit before the coupling process. The decoupling piston 21 has moved out of the active position with its tubular extension 24 . Moves the piston rod 20 in this position of the decoupling piston 21 in the piston 19 , the Spreizseg elements 23 are despread from the piston 19 , but can spread behind the piston 19 again, so that it sits firmly on the piston rod 20 .
Fig. 4 zeigt eine Tandem-Kolben-Zylinder-Einheit 5, deren Kolben 18′, 19′ fest auf der Kolbenstange 20′ sitzen. Die Kolben-Zylinder-Einheit 5′′ ist mit der hydraulischen Regel schaltung verbunden, während die Kolben-Zylinder-Einheit 5′ über Rückschlagventile 14′′ und 14′′′, vom Ventil 17 steuer bar, mit der hydraulischen Regelschaltung verbindbar ist. Jede der Zu- bzw. Ableitungen der Kolben-Zylinder-Einheit 5′ arbeiten über ebenfalls vom Ventil 17′ beeinflußbare Ventile 25, 25′ auf einen Dämpfungsspeicher 26. Die Beschaltung der Ventile 14′′, 14′′′ und 25, 25′ ist so ausgelegt, daß bei geöffneten Ventilen 14′′, 14′′′ die Ventile 25, 25′ ge schlossen sind und umgekehrt. Fig. 4 shows a tandem piston-cylinder unit 5 , the pistons 18 ', 19 ' sit firmly on the piston rod 20 '. The piston-cylinder unit 5 '' is connected to the hydraulic control circuit, while the piston-cylinder unit 5 'via check valves 14 ''and 14 ''', the valve 17 control bar, can be connected to the hydraulic control circuit. Each of the supply and discharge lines of the piston-cylinder unit 5 'work via valves 25 , 25 ' which can also be influenced by the valve 17 'on a damping accumulator 26 . The wiring of the valves 14 '', 14 '''and 25 , 25 ' is designed such that when the valves 14 '', 14 '''are open, the valves 25 , 25 ' are closed and vice versa.
Bezugszeichenübersicht:Reference symbol overview:
1 Walze
2 Walzband
3 Schlinge
4 Schlingenheber
5 Tandem-Kolben-Zylinder-Einheit
6 Gelenk
7 Punkt
8 Druckbehälter
9 Drosselventil
10 Druckbehälter
11 Ventil
12 Servoventil
13 Servoventil
14 Rückschlagventil
15 Druck-Vorspannventil
16 Druckaufnehmer
17 Ventil
18 Kolben
19 Kolben
20 Kolbenstange
21 Entkopplungskolben
22 Anlagebund
23 Spreizsegmente
24 Rohransatz
25 Ventile
26 Dämpfungsspeicher 1 roller
2 rolled strip
3 noose
4 loop lifters
5 tandem piston-cylinder unit
6 joint
7 point
8 pressure vessels
9 throttle valve
10 pressure vessels
11 valve
12 servo valve
13 servo valve
14 check valve
15 pressure preload valve
16 pressure transducers
17 valve
18 pistons
19 pistons
20 piston rod
21 decoupling pistons
22 Investment association
23 spreading segments
24 pipe socket
25 valves
26 damping memory
Claims (13)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19883836371 DE3836371C2 (en) | 1988-10-26 | 1988-10-26 | Hydraulic drive device for loop lifters |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19883836371 DE3836371C2 (en) | 1988-10-26 | 1988-10-26 | Hydraulic drive device for loop lifters |
Publications (2)
Publication Number | Publication Date |
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DE3836371A1 true DE3836371A1 (en) | 1990-05-03 |
DE3836371C2 DE3836371C2 (en) | 1998-02-19 |
Family
ID=6365905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DE19883836371 Expired - Fee Related DE3836371C2 (en) | 1988-10-26 | 1988-10-26 | Hydraulic drive device for loop lifters |
Country Status (1)
Country | Link |
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DE (1) | DE3836371C2 (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4321230A1 (en) * | 1993-06-25 | 1995-03-02 | Siemens Ag | Device for the metrological registration of the strip tension in strip rolling mills |
WO1997020146A1 (en) * | 1995-11-24 | 1997-06-05 | Mannesmann Rexroth Gmbh | Process and device for driving the hydraulic system of a machine |
EP2344772A1 (en) * | 2008-10-10 | 2011-07-20 | Norrhydro OY | Digital hydraulic system |
WO2011157462A1 (en) * | 2010-06-14 | 2011-12-22 | Sms Siemag Ag | Piston-cylinder unit in the form of a switchable stepped cylinder |
ITTO20121029A1 (en) * | 2012-11-28 | 2014-05-29 | Safen Fluid And Mechanical Engineer Ing S R L | VALVE GROUP FOR THE OPTIMIZED FILLING OF VOLUMES IN A PNEUMATIC NETWORK |
CN104307894A (en) * | 2014-09-26 | 2015-01-28 | 江苏永钢集团有限公司 | Lever-type loop |
CN104438375A (en) * | 2014-11-28 | 2015-03-25 | 嘉兴鸿利机械有限公司 | Roll steel loop |
CN107185976A (en) * | 2017-05-09 | 2017-09-22 | 柯利佳 | A kind of bar mill looper |
US10704569B2 (en) | 2015-10-19 | 2020-07-07 | Norrhydro Oy | Hydraulic system and method for controlling a hydraulic system |
CN113695406A (en) * | 2021-07-29 | 2021-11-26 | 宝武杰富意特殊钢有限公司 | Loop pneumatic control system and loop control method capable of automatically adjusting tension |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102009053859A1 (en) | 2009-11-19 | 2011-05-26 | Sms Siemag Aktiengesellschaft | Loop lifter for e.g. rolled strip, in continuously operated conveyor line during steel-hot wide strip production, has drive chain including gear that is operated between shaft and drive element and includes different switchable gear ratios |
DE102009053860B4 (en) | 2009-11-19 | 2021-08-05 | Sms Group Gmbh | Loop lifter |
DE102009053858A1 (en) | 2009-11-19 | 2011-05-26 | Sms Siemag Aktiengesellschaft | Loop lifter for rolled strip or slab in continuously operated conveyor line, comprises loop lifting roller which is supported at two arms in swiveling manner around shaft |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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DE1402654A1 (en) * | 1959-12-03 | 1968-11-14 | Davy & United Eng Co Ltd | Device and method for regulating the tension in web-shaped material, in particular steel strip |
-
1988
- 1988-10-26 DE DE19883836371 patent/DE3836371C2/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1402654A1 (en) * | 1959-12-03 | 1968-11-14 | Davy & United Eng Co Ltd | Device and method for regulating the tension in web-shaped material, in particular steel strip |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4321230A1 (en) * | 1993-06-25 | 1995-03-02 | Siemens Ag | Device for the metrological registration of the strip tension in strip rolling mills |
WO1997020146A1 (en) * | 1995-11-24 | 1997-06-05 | Mannesmann Rexroth Gmbh | Process and device for driving the hydraulic system of a machine |
US6145307A (en) * | 1995-11-24 | 2000-11-14 | Mannesman Rexoth Ag | Method and device for controlling a hydraulic installation of a utility vehicle |
US9021798B2 (en) | 2008-10-10 | 2015-05-05 | Norrhydro Oy | Digital hydraulic system |
EP2344772A1 (en) * | 2008-10-10 | 2011-07-20 | Norrhydro OY | Digital hydraulic system |
CN102245906A (en) * | 2008-10-10 | 2011-11-16 | 诺海卓有限公司 | Digital hydraulic system |
EP2546530A3 (en) * | 2008-10-10 | 2013-07-10 | Norrhydro OY | Pressurized medium system |
EP2344772A4 (en) * | 2008-10-10 | 2013-08-14 | Norrhydro Oy | Digital hydraulic system |
RU2647932C2 (en) * | 2008-10-10 | 2018-03-21 | Норрхидро Ой | Method and system with medium under pressure with controller |
CN102245906B (en) * | 2008-10-10 | 2014-11-26 | 诺海卓有限公司 | Digital hydraulic system |
WO2011157462A1 (en) * | 2010-06-14 | 2011-12-22 | Sms Siemag Ag | Piston-cylinder unit in the form of a switchable stepped cylinder |
ITTO20121029A1 (en) * | 2012-11-28 | 2014-05-29 | Safen Fluid And Mechanical Engineer Ing S R L | VALVE GROUP FOR THE OPTIMIZED FILLING OF VOLUMES IN A PNEUMATIC NETWORK |
WO2014083493A1 (en) * | 2012-11-28 | 2014-06-05 | Safen Fluid And Mechanical Engineering S.R.L. | A valve assembly for the optimized filling of volumes in a pneumatic network |
CN104307894A (en) * | 2014-09-26 | 2015-01-28 | 江苏永钢集团有限公司 | Lever-type loop |
CN104438375A (en) * | 2014-11-28 | 2015-03-25 | 嘉兴鸿利机械有限公司 | Roll steel loop |
CN104438375B (en) * | 2014-11-28 | 2016-08-24 | 嘉兴鸿利机械有限公司 | Steel rolling kink |
US10704569B2 (en) | 2015-10-19 | 2020-07-07 | Norrhydro Oy | Hydraulic system and method for controlling a hydraulic system |
CN107185976A (en) * | 2017-05-09 | 2017-09-22 | 柯利佳 | A kind of bar mill looper |
CN113695406A (en) * | 2021-07-29 | 2021-11-26 | 宝武杰富意特殊钢有限公司 | Loop pneumatic control system and loop control method capable of automatically adjusting tension |
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DE3836371C2 (en) | 1998-02-19 |
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8125 | Change of the main classification |
Ipc: B21B 41/10 |
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D2 | Grant after examination | ||
8364 | No opposition during term of opposition | ||
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Owner name: SMS DEMAG AG, 40237 DUESSELDORF, DE |
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