Comparison of frequency conversion crane and traditional single beam crane

Traditional single girder cranes have been in use since the 1950s and 1960s, and are currently the most used type. This type of single girder crane is low cost and easy to use, making it the best choice for many enterprises and individual users. There are many new equipment and technologies to replace traditional single-beam cranes. Today, I will talk to you about the advantages and disadvantages of traditional single-beam cranes and frequency conversion cranes.

1. Disadvantages of traditional single girder cranes

1. Abnormal start-up noise, unstable, causing unsafe factors to production.

2. The impact on the crane's brakes and various mechanisms is greater, which greatly reduces the service life of the crane.

3. Large starting current, frequent operation, waste of electric energy.

4. Insufficient torque in low gears and fast speed in high gears, causing potential safety accidents.

5. Due to the stability of the running part, damage to the hoisted materials is caused.

2. What are the advantages of frequency conversion cranes

1. The operating mechanism is very stable when starting and stopping, with low noise and good performance during operation.

2. Effectively protect the electrical system and operating mechanism of the crane.

3. The failure rate is low. The frequency converter greatly simplifies the electrical control circuit, and uses the multiple functions of the frequency converter itself to replace the logic circuit that can only be completed by the traditional complicated circuit.

4. The large and small carts and hooks operate accurately, which can be used for precise docking during mold assembly.

5. As it protects the whole crane, it effectively prolongs the service life of the crane.

Compared with traditional single-beam cranes, frequency conversion cranes are more expensive, but the benefits they bring are not cost-effective for small businesses and individual users, which is why they are reluctant to use frequency conversion cranes.

At present, the single-beam crane has been greatly improved in technology. The cart running motor adopts a soft-start motor to replace the traditional motor, so that the single-beam crane runs more smoothly and is more convenient to use. And compared to the frequency conversion crane, the price is also acceptable to all enterprises.

3. Advantages of soft start motor:

1. No impulse current

When the soft starter starts the motor, by gradually increasing the conduction angle of the thyristor, the starting current of the motor linearly rises from zero to the set value. There is no impact on the motor, which improves the reliability of power supply, starts smoothly, reduces the impact torque on the load machinery, and prolongs the service life of the machine.

2. With soft parking function

That is, it slows down smoothly and stops gradually. It can overcome the shortcomings of instantaneous power failure, reduce the impact on the crane, and reduce equipment damage.

3. Adjustable starting parameters

According to the load conditions and the selection of the power grid relay protection characteristics, it can be freely and steplessly adjusted to the best starting current.