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What is the working principle of the tower crane?

[ Huaqiang Security Network News ]
Tower machine frequency converter working principle
What is the working principle of the tower crane?
As a kind of crane, the tower crane has a lifting mechanism, a trolley mechanism and a swinging mechanism.
The special feature of the inverter of the tower crane is that it is used for the potential load of lifting, the impact and inertia are large, and the starting torque of the frequency converter is very high. The other aspect is to input three-phase electricity, and then the inverter uses IGBT to form DC, and then according to the different gear positions, the speed is different. According to the electric formula of V/f=constant, the voltage is reduced by the duty ratio to realize the variable frequency shifting. f is the frequency, which can be understood as the motor speed. According to the increase of the speed, the output voltage V increases approximately linearly, and different speeds are obtained.
The inverter is just like this: the input power circuit is supplied with power, the output power circuit is connected to the motor, the brake circuit is connected to the brake unit and the braking resistor, and the input control circuit is connected to the speed gear, reset and other control signals. The speed signal has digital quantity and analog. Three ways of quantity and bus, the general lifting will add encoder feedback; the output control circuit is connected to the relay and the indicator light indicates the status of the inverter.
Lifting generally uses a special crane setting software, called Shenghong, set up and the translation mechanism is a little different.

The all-hydraulic crawler drill is a multi-purpose, internal combustion engine driven/electrically driven crawler-type full hydraulic drill that not only completes open-air blasting large-aperture drilling operations and ultra-deep hole drilling, but also achieves loose grit, alluvial, etc. The downhole impactor of the hole stratum is drilled with the pipe; it can be widely used in the anchoring hole, drainage hole, grouting hole construction of railway, highway, water conservancy, hydropower station landslide control project and dangerous rock anchoring project, and also used in blasting engineering. Construction of blastholes and tunnel pipe support holes.
The drilling rig is composed of a main machine, a hydraulic station, a console, a crawler walking device and an air compressor; the hydraulic hoses of the main machine, the hydraulic station and the operating table are connected to each other as a whole.
The power head consists of low-speed high-torque hydraulic motor, power head frame, main shaft, gear, faucet, drill pipe, and unloader.
The power head is driven by a hydraulic motor and transmitted directly to the main shaft through a gear to perform a rotary motion, thereby driving the drill pipe and the impactor to rotate. In the middle of the main shaft, a side of the power head has an outer wire joint for connecting the high-pressure hose, and an air outlet pipe of the operation table. Connected, the compressed air enters the inner hole of the main shaft through the wind faucet, and is sent to the bottom of the hole to drive the impactor through the drill pipe, and carries the cuttings formed outside the hole.
The rig structure is monolithic with a track walking chassis and a grip shackle. The crawler chassis moves quickly and the hole position is convenient; the clamping shackle can automatically remove the drill pipe and the casing, which reduces the labor intensity of the workers and improves the construction efficiency.

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