Lift Inverter technology institutions
Tower crane Template for building construction technology and R & D for reinforced concrete structures in industrial and civil construction crane lifting construction materials and components.
1. Currently Hoisting mechanism The main speed control mode
Hoisting mechanism is the tower Crane The most important transmission mechanism, the current heavy demands of traditional low speed mode, light-load high-speed, large speed range; hoisting mechanism speed mode directly affect machine performance. Hoisting mechanism speed control mode choice of three principles: first, to have a smooth, low impact; followed by the economy and reliability to meet the conditions; The third is to facilitate maintenance.
More than 1.1 speed pole change speed motor
4 rope from the weight of less than equal to the largest small-medium-sized tower 6T competition, strict cost control, China to speed multi-pole change speed motor-based, the program is simple, application is more extensive, often used 4/8/32 multi-speed motor to achieve.
1.2 The shift of the electromagnetic clutch Reducer Added eddy current brake with single-speed wound rotor motor
Way the governor has used for decades in China, but has gradually no longer used. It is by changing the electromagnetic clutch gear reducer speed ratio, by eddy current brake with single-speed wound rotor motor series resistance for the soft features and slow speed in place. Its advantage is to run smoothly than the efficiency, speed greater than can be designed. Its shortcomings more, the first electromagnetic clutch of domestic machine tool commonly used products, short life, poor reliability; secondly, not to change the clutch air dynamic stall, or will decline, it is very dangerous; Third, the higher the cost reducer.
1.3 General reducer increases with eddy current brake of the multi-speed wound rotor motor
The electromagnetic clutch on the way to multi-speed motor drive gear ordinary single-speed ratio reducer is this way of thinking. Multi-speed motor shift relative to the impact of major shortcomings, with eddy current brake of the multi-speed series wound rotor motor can get soft Mn resistance characteristics, braking and gear to switch from a more stable place a slow speed, power squirrel cage motor can be used than big. This speed means simple structure, easy maintenance, high reliability. Has successfully resolved the winding eddy current brake rotor motor heat dissipation, dramatically increasing the reliability of speed control mode. 8 ~ 12t
Currently most of the hoisting mechanism speed using this method, but the motor brake and shift from the still larger peak current and shock, electrical control system is more complex, 16t large tonnage of more than hoisting mechanism speed generally is not appropriate to adopt this approach.
1.4 Differential planetary reducer with double motor
Solar planetary reducer by a motor-driven wheel, planetary gear motors by another planetary gear driven by external Track Road Gear with fixed lifting drums. This is the differential planetary speed reducer structure. Line galaxies identified as a suitable parameter, the reel motor speed depends on both speed and direction, with the fast, slow reverse. If it is a single-speed motors, each motor there are forward and backward and stop the motor of three states and another match, so a lot of speed stall. If multi-speed motor, speed stall even more, and this is the differential drive principle. Squirrel cage motor or frequency can be combined with the cage, the smaller tonnage, with a cage, large tonnage, combined with the frequency and squirrel. This approach speed ratio, can meet the heavy low-speed, high-speed light load requirements and high reliability, especially for large tonnage, hoisting mechanism. But the differential planet reducer
complex, generally non-standard design and production, coupled with double-motor, high cost, control complexity. Manufacturers used more than the host.
1.5 Frequency Frequency is the speed of today’s most advanced communication methods. With the gradual decline in the price of international frequency converter, frequency conversion technology more widely. China tower crane hoisting mechanism of the application has many years of good results, but not widely used surface. It has the advantage of slow speed in place long-running, zero speed brake, smooth operation without impact, to extend the structure and Transmission Parts Life, life on the wire rope and great benefit, while improving the safety of tower crane.
However, the use of its lifting surface is very narrow, one inverter is still more expensive imports, domestic inverter, but related; second inverter, once a problem, not a general repair, most can only be new ones; frequency converter speed as high cost, the general application of medium and small tonnage of less lifting bodies, large tonnage is more. Variable speed control used in the area of small tonnage, only to wait for the rise of domestic inverter.
2. Frequency converter in tower crane hoisting mechanism of the program
Tower crane hoisting mechanism in the application of technology to Japan Yaskawa inverter frequency was mainly used in middle tower machine, while the 4-rope’s largest weight of less than or equal 6T from the small medium-sized tower competition, strict cost control Therefore, very few converter application. With the development of power electronics, domestic inverter technology become more sophisticated, clear price advantage, applied to small and medium sized tower crane has become possible.
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I am China Crafts Suppliers writer, reports some information about usb to rj11 adaptor , usb foot warmer.
DRZ400 – Braking STX55D 320mm Disc – POW02 Brake adapter – Review – (1080p HD)
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