Drive in type pallet racking, also known as through type racking, consists of column piece, bracket, bracket beam, top beam, back beam, top pull, back pull, etc. The change of drive in rack dimensions is applicable to the storage mode with relatively few varieties and overall output. Because only channels are arranged, forklifts can drive into the storage area, so the utilization rate of the warehouse is high, and it is mostly used in low-temperature cold chain logistics, drinks, food, dairy products and other fields.
The drive in pallet racking system has typical advanced and back out storage features; forklift operation mode is mostly continuous “high lift and high hit” mode, with high center of gravity of goods, forklift is easy to shake along with the uneven degree of the channel ground and collide with the shelf, which will affect the stability and safety of the shelf structure, so it has high technical requirements for driver driving, turnover speed and efficiency of goods Also affected to some extent.
The structural design of the drive in pallet racking is the most critical factor to determine the shelf quality. In addition, the shelf material, production technology, production equipment, fixture and electrostatic spraying will directly affect the shelf quality and grade. The main structure of the shelf belongs to the statically indeterminate spatial steel structure for many times. It is rather tedious to calculate its strength, rigidity and stability with the traditional classical mechanical method or dynamic method. The simplified calculation model can be used to analyze and optimize the design in combination with the domestic and foreign standards and test data. At present, the structural strength analysis and stability analysis of the finite element method are mostly used for auxiliary design and full-scale load test verification.
The drive in shelf belongs to the door type structure. In order to ensure its stability, the slenderness ratio of the column sheet should not be too high, which should be controlled within 10 meters in general, and should be more than 4 floors and 3-5 columns. Compared with the drive in racking design of the same category, in addition to the larger section specification of steel, the pulling and fixing structural parts shall be added. The main accessories of drive in shelf include column piece, cantilever and cantilever beam, top beam, top diagonal rod, back diagonal rod, walking guide track, foot guard or guard post (protective part of front passage of shelf), etc.
In the design process of the drive racking, the first step is to standardize the products of the tray unit and determine the specification, size, stacking height and rated load capacity of the tray; then, the overall structure of the drive in shelf and the key dimensions such as the span, depth, layer spacing and height of the storage unit can be planned, and the design and audit of the shelf structure and components can be carried out. During the design, design verification or test verification shall be carried out for key parameters, corresponding mechanical simplified model shall be established according to the case structure, relevant strength, rigidity and stability design and verification shall be carried out according to the actual stress (including seismic load, etc.) and load distribution of the shelf, combined with the geometric parameters and mass characteristics of the corresponding component section, and if necessary, experimental verification can be carried out to ensure that Ensure that the design result is consistent with the actual situation.
Post time: 08-11-2020