QD type variable frequency speed regulating bridge crane

Variable frequency variable speed bridge crane
Lifting capacity
Lifting height
Span
Working level
Lifting structure electric hoist winch
Operation method Ground and empty Cao Wireless
Product Introduction
The main mechanisms of the variable frequency speed-regulated bridge crane include the main lifting mechanism, the auxiliary lifting mechanism, the trolley operating mechanism and the trolley operating mechanism. For small tonnage cranes (and below), there is generally no auxiliary lifting mechanism. The main and auxiliary lifting mechanisms and the trolley operating mechanism are each driven by a series of winding motors. The trolley operating mechanism is generally driven by a series of winding motors. Mainly configured frequency converter.
●Car operating mechanism
The electric drag system car operating mechanism is driven by a variable frequency motor and controlled by a frequency converter. The system control method is similar to the electric drive system of the lifting mechanism.
●Electrical control
The control cabinet adopts a closed type and is equipped with a cooling fan and air filter to prevent dust from harming electrical components. The frequency converter adopts a series of special lifting frequency converters from Germany's Siemens Corporation and Japan's Mitsubishi Corporation. The speed regulation method adopts a frequency conversion speed regulation system with vector control function, and the rotation speed is controlled by a special potentiometer speed regulation controller for the crane.
●Brake structure
It adopts a combination of regenerative braking, DC braking and electromagnetic mechanical braking. During operation (lowering of heavy objects), the regenerated electric energy is consumed by connecting a braking resistor in the DC circuit of the frequency converter, and the running large and small trucks and hooks are quickly and accurately stopped (speed reduction). When working with hooks, there is often a phenomenon of heavy objects staying in mid-air for a period of time (for example, when the heavy objects are moving in the air or there is a sudden power outage, although the variable frequency speed control system can stop the heavy objects, it is easily disturbed by external factors ( For example, power outages often occur during translation and the reliability is poor. Therefore, electromagnetic brakes must also be used for mechanical braking to complete the operation reliably.
●Safety protection
The inverter has short circuit, overvoltage, phase loss, voltage loss and overcurrent. Various protection functions such as overspeed grounding, fault self-diagnosis and display alarm functions. When the inverter has short circuit overcurrent and other faults, the inverter will give a fault signal, stop output, cut off the power of the inverter, control the brake, and issue Alarm signal. In addition to the internal protection function of the frequency converter, the hook lifting mechanism is also equipped with line protection.
Performance characteristics
●Working reliability is significantly improved
The weak link of the motor is eliminated. Due to The wound rotor asynchronous motor is replaced by a cage rotor asynchronous motor, thereby eliminating weak links such as brushes and slip rings. The life of the brake electromagnet can be greatly extended. The original drag system performs braking in a moving state Yes, after adopting variable frequency speed regulation, the brake can be held in a basically stopped state. The wear of the brake skin will be improved and the operating handle will no longer be easily damaged. The operating handle of the original system is a wearing part due to the large force. After adopting variable frequency speed regulation, the force on the operating handle is very small and is not easily damaged. The failure rate of the control system is greatly reduced. The original system is controlled by a very complex contactor relay system, and the failure rate is high. Using variable frequency speed regulation After the speed system is installed, the control system can be greatly simplified and the reliability is greatly improved
●The energy saving effect is very impressive
When the wound rotor asynchronous motor is running at low speed, the external resistance of the rotor circuit will consume a large amount of electric energy. After adopting the variable frequency speed regulation system, not only the large amount of electric energy consumed in the external resistor can be saved, but also when the hook lowers the heavy object, the potential energy released by the heavy object can also be fed back to the power supply
●The quality of speed regulation is significantly improved. .
After adopting the frequency conversion speed regulation system, the speed regulation ratio can reach above 100%, and the speed regulation accuracy reaches 100%. The speed regulation is stable, and it can run at low speed for a long time, with high positioning accuracy and operating efficiency.
●The transmission chain can be simplified due to stepless speed regulation, thereby eliminating the need for non-standard design reduction gearboxes in the machinery, making the transmission chain structure simple and standardized.
Ordering Instructions
Before delivery, the following crane should be determined The main parameters are lifting weight (lifting weight of main hook and auxiliary hook), span lifting height, track length, etc.
Listed are lifting weight, span lifting height.
When loading, it must be determined that the conductive form of the cart is a sliding contact line. Power supply position control method.
For example, the traveling mode is a trolley line, the power supply position is at the end of the workshop, and the operation mode is ground operation or cab operation.
Crane manufacturing standards
●General bridge crane
● Crane design specifications
● General technical conditions for welded structural parts
● Crane pulley safety requirements
● Crane safety regulations
● Crane test specifications and procedures
● Steel wire rope
●General technical conditions for industrial machinery and electrical equipment
●/Electric hoist gantry lifting
● Safety signs, safety colors, etc.
● Industrial enterprise boundary noise standards
> ● Specifications for construction and acceptance of lifting equipment installation projects
● Safety distance for mechanical protection
● General principles for safety and health requirements in the production process
● General principles for safety and health design of production equipment
● Electric light sources Safety requirements
Crane material standards
● High-quality carbon structural steel technical conditions
● Carbon structural steel
● Round strand wire rope
● Low alloy structure
● Low alloy high strength structural steel
● Low alloy steel welding rod
● Welding wire performance and use
● Basic types and sizes of carbon steel and low alloy steel weld grooves
● Boilers and Ultrasonic flaw detection of butt welds of steel pressure vessels
● Cast carbon steel parts for general engineering
● Gray cast iron parts
● Crane electronic control equipment
● Steel melting welding butt joints with radiation Photography and quality grading
● Steel welds and ultrasonic flaw detection methods and grading of flaw detection results
● High-quality steel wire
● Electric hoist bridge crane
Application scope
Applicable to The grab is configured for lifting work in mechanical processing and assembly workshops, metal structure workshops, metallurgical and casting workshops, and various warehouses. It is suitable for handling bulk materials at fixed spans indoors or in the open air in metallurgy, cement, chemical and other industrial sectors.
Contact Qin Chao
Position Sales Manager
Telephone
Mobile phone
Address Shuangqiao Xiongfeng Industrial Park, Dianbu Town, Feidong County, Hefei City, Anhui Province