Frequency converting control system of tower crane

Abstract

The invention discloses a frequency converting control system of a tower crane. The frequency converting control system comprises a PLC (programmable logic controller) control system and a tower crane lifting frequency converting control system, wherein the PLC control system is respectively connected with the tower crane lifting frequency converting control system, a tower crane rotation frequency converting control system, a tower crane amplitude and frequency converting control system, a tower crane command control system, a tower crane braking system, a tower crane safe control system and a tower crane loading and torque detecting system; a lifting driving system is connected with the tower crane lifting frequency converting control system, a rotation driving system is connected with the tower crane rotation frequency converting control system, and an amplitude changing driving system is connected with the tower crane amplitude and frequency converting control system; an electromechanical magnetism braking power supply, the tower crane lifting frequency converting control system, the tower crane rotation frequency converting control system and the tower crane amplitude and frequency converting control system are respectively connected with a main power supply; the electromechanical magnetism braking power supply is used for providing an electromagnetic braking input power supply for the tower crane braking system, and the tower crane braking system is respectively used for providing a tower crane braking executing power supply for the lifting driving system, the rotation driving system and the amplitude changing driving system.

Description

technical field [0001] The invention relates to the technical field of electrical control of construction machinery equipment, in particular to a tower crane frequency conversion control system. Background technique [0002] With the continuous upgrading of tower crane control methods in construction, tower crane frequency conversion control has been widely used. The application of the frequency conversion control system greatly reduces the labor intensity of production, improves the safety of the operation of the tower crane, and reduces the impact on the mechanical structure of the operation links such as lifting, turning, and luffing. However, in the prior art, since the tower crane operates under light load most of the time, the maximum operating speed of the existing frequency conversion control system remains at a fixed frequency of 50Hz even under no-load and light-load conditions, and the maximum operating speed It cannot be adjusted automatically according to the l...

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Problems solved by technology

However, in the prior art, since the tower crane operates under light load most of the time, the maximum operating speed of the existing frequency conversion control system remains at a fixed frequency of 50Hz even under no-load and light-load conditions, and the maximum operating speed It cannot be adjusted automatically according to the load situation. This state consumes high energy and restricts the further improvement of the production efficiency of the tower crane. Since the maximum operating speed cannot be adjusted according to the load, the energy-saving effect of the inverter control system is greatly reduced. The impact on the mechanical structure during the process is large, and there are still hidden dangers in the safe operation and reliability of the equipment. At the same time, the potential of the frequency converter has not been fully utilized, so that the advantages of high efficiency, safety and energy saving of the frequency conversion controller have not been well reflected.

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