With the rapid development of the logistics industry, the demand for storage efficiency and intelligent warehousing in various industries is increasing. Existing stacker cranes are prone to causing coils to fall during the process of handling and stacking coils, which prevents the existing automated storage systems from being applied in strip rolling plants. Therefore, how to reduce the risk of coils falling during the handling and stacking process by stacker cranes has become a thorny issue.
When conventional manufacturers produce coils such as steel coils and paper rolls, there are certain difficulties in storing and retrieving these special materials. Traditional conveying equipment occupies more space, has complex storage, and low efficiency. The application of automated three-dimensional warehouses can improve the storage and retrieval efficiency of coils, reduce labor costs, and decrease warehouse area, achieving efficient and intelligent management. However, since some solid coils, especially steel coils and coated paper, can weigh several tons or even more than ten tons, it is necessary to design and develop heavy-duty coil stacker cranes.
I. Mechanical Structure
The metal structure mainly consists of the upper beam, columns, lower beam, safety ladder, rest platform, and operation platform. The main frame structure of the metal framework is welded from steel plates or channel steel, with open sections welded from steel plates, square tubes, rectangular tubes, etc. During welding, the weld width and the verticality and parallelism of the welded components are strictly controlled to ensure the overall structural installation dimensions.
The stacker crane's upper rail uses H125 steel, and the floor rail uses 89Cr steel rail to ensure the strength and rigidity of the stacker crane rails. The upper beam is made of spliced steel plates, and its structural rigidity meets the static rigidity requirements, with the deformation calculated to be controlled within 1/1500 of the total beam length. It is equipped with pulleys, upper rail guide wheels, safety protection mechanisms, safety rope fixing points, etc. The main body of the column is welded from steel plates and I-beams, with wider flat steel welded on both sides for the guide wheels of the outer cargo platform to travel on; steel plates and elevator guide rails are welded onto the I-beam. These guide rails can ensure that even when the length is long, the verticality of the guide rails is maintained, preventing distortion of the rails due to excessive height of the stacker crane, which could cause vibration of the cargo platform. The lower beam is welded from spliced steel plates with internal stiffeners. The structure of the lower beam is designed according to the height of the stacker crane, and the deformation calculation meets the industry standard static rigidity requirements. In addition to the main load-bearing structure, a climbing ladder and rest platform are provided on the outside of the column for convenient maintenance. The electrical control cabinet and operation platform are located on one side of the stacker crane.
