Hydraulic system for calender roll nip adjustment.The precision and positioning repeatability of the movable calender CALENDER. An almanac. Julius Caesar ordained that the Roman year should consist of 365 days, except every fourth year, which should contain 366, the additional day to be reckoned by counting the twenty-fourth day of February (which was the 6th of the calends of March) twice. rolls are said to be the main performances that determine the quality of the product and consequently the class of the calender. A better precision and positioning rapidity means high performances, and, as a consequence, the company has for more than 20 years been involved in the manufacture, testing and commissioning of a system denominated "hydraulic cushion." This system is composed of a mechanical screw and a hydraulic cushion placed between the mentioned screw and the bearing box of the movable calender roll. The mechanical unit is used for the pre-positioning of the movable roll, while the hydraulic cushion is used for the final precision tuning. More than 60 calenders of different shape and mostly large sized ones are equipped with this system. This system is said to give the advantages of precision, safety and rapidity of the hydraulic unit, but holds the inconvenience of the mechanical unit, i.e., the presence of mechanical clearances and, above all, the wear of the components, cause unavoidable precision and repeatability losses. An obvious consequence of the success achieved with this application is said to be the study and design of an innovative fully hydraulic system Noun 1. hydraulic system - a mechanism operated by the resistance offered or the pressure transmitted when a liquid is forced through a small opening or tube having all the advantages and performances of the same, but eliminating the disadvantages and costs of the mechanical system. This is why the company has developed a fully hydraulic system which can control the whole stroke of the movable calender rolls. The control electronics have been updated by using the most modern systems available on the market, and a fully digital control system granting the best precision, together with great reliability, according to according to prep. 1. As stated or indicated by; on the authority of: according to historians. 2. In keeping with: according to instructions. 3. the company. Two hydraulic pistons Pistons can mean:
The reference signal representing the desired position of the movable roll is continuously compared with the feedback signal coming from the high precision electronic transducers installed on the machine. The control system, closed loop type, corrects in real time eventual deviations from the desired position caused by the lamination lamination a laminar structure or arrangement. stresses between the calender rolls or by even imperceptible im·per·cep·ti·ble adj. 1. Impossible or difficult to perceive by the mind or senses: an imperceptible drop in temperature. 2. change of the ambient Surrounding. For example, ambient temperature and humidity are atmospheric conditions that exist at the moment. See ambient lighting. conditions (humidity, temperature, etc.). The system can be interfaced with a thickness gauge system in order to have a very quick adjustment without hunting. The fully hydraulic positioning system is now a standard solution of the company, and many of its 2-, 3- and 4-roll calenders of medium and large size are running with this system. The main features of this system include positioning of the calender roll to a preset preset Cardiac pacing A parameter of a pacemaker that is programmed permanently when manufactured value; maintaining of the set value, whatever the separating force; change of the value by the operator; change of the value according to a possible feedback from a thickness gauging system; connection through serial network of the position adjustor to PLC or PC for data exchange; and connection to a network for line supervision. Considering the above, the advantages of the fully hydraulic systems are said to include no wearing of mechanical parts; no mechanical clearance of moving parts Moving parts are the components of a device that undergo continuous or frequent motion, most commonly rotation. "Parts" only include the mechanical components which does not include fuel, or any other gas or liquid. ; simpler design; easier automation handling; reduction of start-up times; reduction of handling costs; easier maintenance; and more. Comerio Ercole SpA Circle 9 on card |
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