Pulp and Paper Production at the Highest Level. with Electrohydraulic Drive Technology from Rexroth

Pulp and Paper Production at the Highest Level. with Electrohydraulic Drive Technology from Rexroth

Pulp and Paper Production at the Highest Level. With Electrohydraulic Drive Technology from Rexroth. Intelligent, Accurate, Robust and Reliable From Raw Material to Fine Paper The production of pulp and paper Paper and pulp manufacture places slightest problem can have far- is such a demanding process that exceptionally high demands on reaching consequences. A crack in only highly qualified specialists the drive technology. In order to the paper web or a drive malfunc- working on high-quality automa- ensure smooth interplay between tion would inevitably result in an ted systems are able to undertake the high forces generated here, the emergency shutdown of the com- these tasks successfully. Rexroth highest level of robustness and plete system, necessitating a restart, is setting standards in this field absolute precision are demanded which is costly. The technology worldwide: Wherever drives and simultaneously of machines and used must offer maximum preci- controls are concerned – and if systems. system performance is to be maxi- mized – engineers and operators Paper webs of over ten meters in are opting for the intelligence, pre- width, production speeds of up to cision, reliability and longevity of two thousand meters per minute – Rexroth electrohydraulic systems. and that’s around the clock – under such conditions even the Applications Center for the Paper Industry 4 • Optimization through simulation technology • Innovative electrohydraulic drive systems Chemical Pulp Production 8 sion, dynamics and reliability at all times if such time- and cost-inten- • Digester – Hydrostatic mixed blade drive sive downtimes are to be avoided. with pump, transmission and hydraulic The specialized electrohydraulic motors solutions from Rexroth meet these • Pressure defusers – Specific control requirements – both in the produc- blocks and hydraulic cylinders for screen tion process and at the finishing control stage – and to the highest level. • Dewatering presses – Modular hydro- static drive systems for dewatering drums Mechanical Pulp Production 12 • Refiners – Dynamic positioning and pressure-controlled cylinder drives for refiner disc control Paper Production 14 • Paper calenders – Synchronous and pressure-controlled cylinder drives for roller adjustment as well as deflection compensation of the calender rollers • Paper winders, slitter winder – Position and pressure-controlled cylinder drives for rider roll, press rollers and clamping functions Paper Finishing 20 • Coaters – High dynamic response syn- chronous and force-controlled cylinder drives for the splice roll • Paper winder – Compact solutions for position- and force control of press rollers in winders Modernization / Service 23 4 Applications Center Paper Industry Rexroth Applications Center Paper Industry: Your Specialist for Branch Solutions Rexroth has set up the Applications Center Paper Industry to develop the best possible results in precision, economy and longevity of production systems. Specialized knowledge of industrial hydraulics, many years of experience in this branch and extensive process com- petence are all combined here – often in direct, close contact with the users from the industry – to develop highly specialized, individual system solutions. Customer-specific solutions With its Applications Center Paper Industry, Rexroth offers its partners in this sector the assurance of benefitting from the support of the complete Bosch Rexroth international know-how at all times. Whether this relates to engineering and construction of production systems for optimi- zation of factory configurations or efficient modernization measures – you can always be sure that branch-specific features, individu- al requirements and local prevai- ling conditions will be taken fully into consideration. Machine control PLC Fieldbus/Drive bus Frequency Digital axis converter controller Rexroth Rexroth BTA BTA Rexroth Rexroth Rexroth Servo motor Control valve Integrated digital axis controller Eliminating problems before Electrohydraulics: The best of they occur both worlds Rexroth develops customized There is virtually no other branch solutions based on a worldwide of industry where the particular unique, proven product spectrum. advantages of electrohydraulic With the aid of modern simulation drives really come to the fore, as in software the complete, actual the paper industry. Highly complex production process can be dis- pressure, force and synchronism played, tested and optimized in control, which are particularly detail as early as the planning and characteristic of papermaking development phase of a system. machines, represent a technical This reduces commissioning time challenge and demand intelligently to a minimum and guarantees designed electrohydraulic drives. maximum efficiency of the whole system right from the start. In its systems Rexroth combines the unique technical advantages of electronic and hydraulic com- ponents, offering solutions that promise a maximum degree of economy and high product quality to customers with high specifica- tions. Systems with control cabinet electronics and also integrated axis controllers with intelligence at the valve are setting standards right across the branch with respect to precision, dynamic and control accuracy – and standardized inter- faces permit easy integration of the hydraulic-specific motion control into the control architecture. Applications Center Paper Industry Pulp and Paper Production Bosch Rexroth AG Hydraulics Zum Eisengießer 1 97816 Lohr, Germany Tel.: +49(0)9352/18-0 RE 09957/10.07-CD AG th xro Re sch Bo 007 ght 2 ©Copyri The DVD “Pulp and Paper Production by Rexroth” contains: • Corporate film • Application examples • Paper animation • Information • Contacts • HYVOS Simulation Program 8 Chemical Pulp Production: Where Basic Forces Naturally Prevail The production of pulp places particular demands on the drive technology. This process involves chemically digesting wood particles with the aid of strong alkaline solutions under high pressure, at high temperatures and constant motion. The chemical production process demands an extremely sophisticated technology: powerful, low- maintenance and precision control of the drives with a high degree of effectiveness and a long service life – all typical features of Rexroth electrohydraulic drives. The finite element method in its Digester element Damper For these exceptional requirements Wood chips for pulp production Rexroth has developed a branch-specific drive Impregnator system – comprising the A2FLM Pressure defuser Atmospheric washer Axial Piston Motor with coupled A2FM GMH planetary drive and the A4CSG Axial Piston Pump. The Rexroth planetary drive, built to the finite element method, permits long-term stable operation. A per- Dewatering press fectly tuned translation for the Pulp hydrostatic transmission permits high-speed accuracy, combined with accurate rotation, even at low speeds. GMH High pressure r r r r Process sequence of chemical pulp production A4CSG Chemical Pulp Production 9 Chemical Pulp Production: Where Basic Forces Naturally Prevail Pump-motor combination as a hydrostatic transmission DigesterDigester In top form even under the DamperDamper harshest conditions WoodWood chips chips One of the outstanding features of the electrohydraulic drive concept ImpregnatorImpregnator from Rexroth lies in the closed PressurePressure defuser defuser AtmosphericAtmospheric washer washer profile, robust construction method, both of the components and the complete system. This makes it particularly resistant to harmful environmental influences such as moisture, dirt, aggressive chemicals, high pressures and DewateringDewatering press press PulpPulp extreme temperatures. These are properties that many users in the industry really appreciate – and it clearly pays off in the form of a minimal maintenance outlay and low service life costs. HighHigh pressure pressure r r r r r r r r 10 Chemical Pulp Production: Precision plus Stability Whether slow and smooth yet with powerful rotations, or whether accurate and highly dynamic linear motion – Rexroth technology can perform both in the extraction of raw materials: the longest service life of systems and components despite immense loading and simulta- neous sensitive open and closed loop controllability. Long service life for series In order to guarantee stable oper- production ation with these extreme loadings Both for the mixing blades in pulp over a long period, Rexroth places digesters and the rotating drums particular emphasis on a long in dewatering presses, drives that service life when designing the operate slowly and with very high drives. r r r r torques are required for even dis- tribution and for pre-dehydrating the raw material. Digester Dewatering press Chemical Pulp Production 11 Pressure defuser Optimized pressure defuser In order to ensure that the washing process in the pressure defuser achieves the best possible results, precision movement of the screen is of great importance. The Rexroth drive system developed especially to this purpose permits accurate control of these cyclical move- ments. Special components such as the CYDI cylinder and pressure- compensated FESE proportional throttle valves, as well as a control F[t] F[t] manifoldblock directly on the cylinder, control the immense dynamic forces continuously and with maximum precision. CON With the help of special Rexroth LCD63DR50E software, the behavior of the new m complete pressure defuser system x is displayed at a very early stage. A4VSO CON

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