Construction elevator successfully tested frequency
Construction of modern high-rise construction in the lift with the matching of large tower crane indispensable construction equipment. Especially in high-rise, high-rise building construction as an extremely important task, for the construction period and to ensure safety, reduce construction costs, reduce labor intensity plays an irreplaceable role. Construction team is also an important indicator of the level of equipment. As a general with experience in each level with the tower crane is equipped with at least one construction lifts. This article describes the culmination of construction machinery in the construction elevator to bring the good performance and energy-saving effect.
As a general lift transport personnel and high-rise building materials scattered and fragmentary vertical transportation equipment has been widely used, the production of dozens of varieties, 90% are 1 to 2 tons, but its problems are basically the same with the tower crane . The main reasons are the following:
1) Control System
Elevator control system is a key part of the construction, determines the overall performance of the pros and cons. Normal lift control is achieved through the contactor control, single speed, start braking a large impact on the structure and organization of more serious damage to electrical components are easily damaged, and the speed is relatively low, usually 34-38m/min only affects the speed of construction has affected the construction business benefits. If you simply increase the speed would cause the acceleration is too large, structures and institutions suffered from the impact is too large to speed up the rack and pinion and brake disc wear, thus reducing the reliability of operation.
2) Start-up and braking systems
Ordinary lifts are starting to take direct or star-delta starting voltage starting, the impact is very large, the motor and cause serious damage to electrical components, while the material is easy to fall inside the lift, especially by some people there Lifts phenomenon. there is a major security risk.
Ordinary lifts the brake is mechanical brake braking force, the lift suddenly from high speed to zero speed, because of inertia effects, not only cause damage to structures and institutions, but also easy to lift the material inside the drop, there are certain security risks.
3) The leveling system
General leveling lift when no slowdown to the crawling process, from the speed reducer directly to the zero speed, lift Xuanping visual layer is made of the driver manual control achieved by the low efficiency, often, the next stop jog a few times can be accurately layer. Not only reduces drag and increases efficiency and control system fatigue, shortened life expectancy, but also the material cause which can not transport, waste of time, affecting the efficiency.
In order to meet market needs, Dacheng Construction Machinery www.hndcjx.com SC in general, based on the type of construction lift, construction of manufacturing SC200/200W type conversion lift. Max lifting speed of up to 60 m / min, the machine has the following characteristics:
1, using the world's most advanced microcomputer frequency control devices and programmable logic controller (PLC).
2, the use of variable speed, the lift to start, no impact on the braking process, stable, more comfortable ride.
3, the use of open loop V / F speed control accuracy up to ± 2 ~ 3%, can achieve accurate low-speed lift in place, will not load a large, sliding down when stopping.
4, the frequency control system limiting function, motor starting current, to reduce the impact of power grid, remote power supply voltage drop will not be leaving too much difficulty in starting the motor, while alleviating the electrical equipment on site effect, reducing energy consumption.
5, due to start braking no impact of increased run smoothly and effectively reduce the impact of mechanical components, reducing gear, rack, brakes and other wear and tear, extending component life.
6, the inverter system also has overvoltage, undervoltage, overcurrent, overload; and other security features to prevent the accident.
7, can be edited using the software editing program controller technology to streamline operations, to prevent misuse, increasing the safe operation of equipment.
