Wuhan Handern extruder drive device type
DATE：2020/5/23 8:32:46 / READ： / SOURCE：This station
Wuhan Handern extruder drive device type
The constant speed AC motor was used in the early days of the extruder, but it has been eliminated due to the inability to change speed. www.handern.com Plastic building template.
The eddy current coupling is a circular drum driven by a constant speed AC motor. Inside the drum is an output shaft connecting the rotor and a surrounding excitation device. When the drum rotates, eddy current magnetic force lines are generated, which together with the excitation device couples the drum and the rotor, and transmits the torque and speed of the AC motor to the output shaft of the coupling. The heat generated under a certain load is removed by water cooling or air cooling. Slippage or stall is its inherent characteristic, because it is impossible to apply enough excitation to couple two large components when changing the load. The efficiency is usually very low at slow speeds, so that it is reduced to a eliminated drive device in most extruder applications. The constant speed AC motor driven by belt drive and variable V-belt wheel is characterized by low cost, high maintenance cost and limited power capacity. This type of drive is generally only used for the smallest and cheapest extruder. www.handern.com Plastic building template
The converter is a speed control device, which allows to change the frequency and voltage applied to the standard constant speed AC motor, and allows its speed change to be related to the number of poles of the motor. This type of drive device has a low motor price but a high controller price. Attention must be paid to the cooling of the motor, because the AC motor body is designed to effectively cool at full speed, and the heat generated during deceleration may not be dissipated. www.handern.com Plastic building template
The hydraulic drive uses high-pressure oil. The pressure of the high-pressure oil is provided by a power unit that includes an oil storage tank, an electric pump, and a valve installed locally (or remotely). The hose is used to supply oil to the engine, and the rotor in the engine is driven by the oil. The possibility of oil leakage is a common reason for the lack of support for this drive. www.handern.com Plastic building template
The hydrodynamic drive device uses a constant speed AC motor to drive the propeller housing, which in turn centrifugally pushes the oil into the rotor, thereby driving the output shaft. Changing the amount of fluid (oil) can change the speed of the device. This type of drive is rarely used because of its low efficiency at low speeds. www.handern.com Plastic building template
The DC motor generator driving device is the pioneer of the DC SCR device. The DC motor generator constant-speed AC motor drives the DC motor armature with AC power to generate DC power. This drive device was eliminated due to the development of SCR drive device. www.handern.com Plastic building template
The DC SCR drive device enables the SCR to control and rectify the DC current of the motor. This drive is much more efficient than most other types of drives. At present, the DC SCR drive device is the most commonly used, because it has the ability to meet the requirements of most extrusion coating and composite processes www.handern.com plastic building templates
The motor of the driving device is usually connected to the extruder by a belt and a V-belt or a flexible coupling. The specification of the connecting device is designed based on the torque that it must transmit to the screw, usually plus a safety factor of 1.5. Belt and V-belt devices are generally limited to lower power applications due to the number of belts required, belt supporting facilities and required floor space. Replacing the V-belt can change the reduction ratio, thereby changing the maximum screw speed. www.handern.com Plastic building template
Flexible couplings provide the possibility of connecting the motor directly to the extruder in a compact arrangement. Gear type, plug-in flexible steel plate type and other types of couplings must consider a small amount of angle and compensate the error of the transmission shaft. ,
No matter what kind of drive device, the rotating part must provide safety protection device. www.handern.com Plastic building template
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