HYDRAULIC ELEVATOR MAIN EQUIPMENT

POWER UNIT:
Our firm uses Beringer marked power units made of Switzerland in its projects. Beringer Ventil block is electronically controlled. By means of electronical control, following advantages are possible;

• great tolerance in oil temperature,
• lower energy expenses and power capacity,
• reduction in total movement time by means of keeping short the gear ways,
• increase in downward movement up to %50 without requiring any additional cost and making concession on comfort,
• compensability of load and temperature alterations.


CYLINDER :
Cylinders used in hydraulic elevators are generally single acting; and are suitable for only vertical operation, in pushing and pulling direction.

Single stage cylinders: Cylinders used in indirect drive systems (1=2) are plunger typr. These cylinders have impermeability harness only on their neck sections and at only that section there is a touch between felts and the honed outer surface of piston lever. Maintenance is substantially easy and cost-effective in that cylinders thanks to the simple structure of them. They can be manufactured as double or multi-parted against the problem of transportation and assembly in places with a long travelling distance.

Multi stage (telescope ) cylinders: In direct driven systems (1=) on the other hand, 2 or 3 stage telescopic cylinders are used depending the travelling distance. Stages of telescopic sylinders used in elevators must operate synchronically contrary to those used in industry. Stages goes up and down simultaneously and in the same size


Draw cylinders: Draw cylinders are used in elevators with a high travelling distance. There is not any buckling problem as they operate in draw direction. These cylinders can also be manufactured as double or multi parted against the problem of transportation and assembly.



BLOWN OUT STEAM PIPE ISOLATING VALVE (FLOW LIMITATION VALVE) :
Hydraulic connection between power unit and the cylinder are performed by specific 2 or 4 fold steel plaited pressures hoses in hydraulic elevators. Exploding pressures of these hoses are much over the operating pressures and they possibly not explode in normal operating. Howeve every kinds of safety measures must be taken for it is a system by which the human is carried. A isolating valve is provided on cylinder entrance in case of hose explosion or any possible damages on connection points.
This valve is a safety valve which is hydro-mechanical and adjustable acting only in downward direction. Adjustment parameter is oil flow amount which is balanced with the elevator velocity (flow=ltr/min). In case elevator exceeds its normal nominal speed to the extent of 1,35 times, this valve automatically locks itself by the effect of dynamic pressure and smoothly stops the downward movement of cylinder. This valve is reactivated again only after the elevator is operated upwards.



CONTROL TABLE :
Control system performs the conditions demanded in Hydraulic elevator standards and is programmable according to operating conditions of the elevator. General specifications:

• Microprocessor technics, control without contact (without relay),
• In case of any failure in elevator (energy shortages, damages on one of the phases, excessive heat of engine and etc.), automatically going to the down stop and opening the doors,
• Floor stopping sensitivity of cabinet ±3mm,
• Precautions against phase reduction, overheating and overload,
• Permanent automatic levelling on both directions,
• Parking travel,
• Movement control,




SOFT STARTER:
In order to prevent demurrage current reduction and tension decrease in hydraulic elevator drives, starting the engine can be performed by star / triangle connection. However star / triangle connection does not display the same effect obtained in industrial engines in hydraulic elevator engines which are operated in oil. In processing to triangle, engine cycle decreases to a great extent due to the lack of balance wheels and the friction resistance of the oil which is operated in; and a demeraj current is occured which is approximately similar to direct start. Star / triangle connection which is performed by contactor causes electrically short time high current pigs as well. Current piks possibly damages the other electronic circuits used in control system. The contactor which is a mechanical product has a limited life-span, operates noisy and requires periodical maintenance. Our firm performs the start of the engine by means of electronic Softstarter in high capacity elevators requiring large drive engines. Electronic Softstarter is mounted on power unit in place of klemens box and prevents all the negativity originated by condactors in use.



AUTOMATIC LEVELLING DRIVE ENGINE:
Possible distortions must automatically be compensated which can be occured during perfoming loading and unloding to the floor levels accordingto hydraulic elevator standards and in case of possible oil leakage. Cabinet speed must be maximum at 0,3 m/s during automatic levelling and that speed must be kept under control. Our firm performs automatic levelling in high capacity elevators requiring large drive engines by means of low power (1,5-4 kW) additional drive group not by means of main drive engine. That drive engine is mounted on the unit and introduced only during upwards levelling. Meanwhile what is intented here is to reposition the cabinet distorting from the floor to the floor level again within a very short reaction time, with a cotrolled velocity and by using the current which is %10 of normal current without introducing the main engine. Thanks to automatic levelling additional drive group, floor adjustment of the cabinet can be performed with a sensivity of ±3 mm and it is possible to save energy since the main drive group is not used.