Application Of VFD In CNC Steel Bar Straightening Machine

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APPLICATION OF VFD

Fully Automatic CNC Steel Bar Straightening Machine

The fully automatic CNC steel bar straightening machine is a high-precision equipment designed for straightening small-diameter wire rods. It features automatic and rapid adjustment of online length, allowing for multi-task operations with different lengths of steel bars. This equipment is widely used in various fields such as large-scale highway, railway, and nuclear power plant construction.

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vfd inThe Fully Automatic CNC Steel Bar Straightening Machine

Composition and Working Principle of CNC Steel Bar Straightening Machine

The fully automatic CNC steel bar straightening machine consists of a frame, a microcomputer controller, a straightening frame with straightening rollers, an electric motor, a length control sensor, a steel bar automatic cutting mechanism, and an automatic unloading mechanism. It operates by inputting the quantity of steel bars to be cut into the microcomputer controller. Based on the set cutting length of the steel bars, the position of the length control sensor on the unloading chute plate is determined. The electric motor drives the straightening frame, which contains the straightening rollers, to rotate at high speed. The rotating straightening rollers press and straighten the twisted steel bars into a spiral shape, continuously pulling and stretching them forward to achieve straightening.

Connected to the power unit is an eccentric mechanism, which is linked to a slider that moves up and down. The slider cooperates with a slide plate, and together they form a swing arm. Inside the swing arm, which is at the same height as the steel bars, there is a lower cutting blade. The lower cutting blade has a hole through which the steel bar passes. The lower end of the swing arm is hinged at the bottom of the frame. The upper part of the cutting blade is fixed to the lower part of the slider, and it protrudes from the slider and moves along the end face of the cutting blade. When the straightened steel bar reaches the set length, it contacts the length control sensor, which triggers the automatic cutting control circuit in the microcomputer controller. This activates the electromagnetic solenoid to operate the automatic cutting mechanism and the automatic unloading mechanism, enabling synchronous automatic cutting and unloading of the steel bars.

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Advantages After Using VFDs In Straightening Machine

Reducing equipment startup current stabilizes the grid voltage and significantly alleviates power capacity constraints.

Traditional steel bar straightening machines without frequency converters have startup currents equal to (4-7) times the rated current. This can cause serious impact on electromechanical equipment and the power grid, and also leads to excessive requirements on grid capacity. Hars variable frequency drive provides eight protection functions such as motor phase detection at startup, input and output phase loss protection, overcurrent protection, overvoltage protection, undervoltage protection, overheat protection, and overload protection to protect the motor. Therefore, operating the straightening machine with frequency converter extends the service life of the motor and switch, avoids the impact of startup current and torque on the motor, prolongs the service life of the motor, and alleviates power capacity constraints.

Smooth startup reduces mechanical impact and extends equipment service life.

The soft start function of the Hars frequency converter enables the startup current to start from zero, with minimal impact, rising only with increasing speed, and never exceeding the rated current. This reduces the impact on the mechanical parts, extends the service life of the steel bar straightening machine, and reduces maintenance costs.

Reduced noise improves production efficiency.

After switching to a Hars VFD, the steel bar straightening machine starts smoothly, avoiding the noise caused by direct contactor startup and mechanical impact. Additionally, using a Hars frequency converter allows the motor to operate at 70Hz, increasing conveying speed and improving production efficiency.

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