How to Select the Uprights for Heavy-duty Shelves

2024 12/24

Both analytical calculations and practical applications have demonstrated that the mechanical properties of the materials used for the uprights, the design of the molds, and the manufacturing precision are the main factors influencing the load-bearing capacity and stability of the uprights. The size variations of various hole shapes have a direct impact on stability, while the local thinning of the material's cross-section has little influence on stability.
Stability calculation: Although the uprights of the shelves are basically formed by cold rolling thin steel plates and the uprights' cross-sections are bent multiple times, local buckling will not occur. However, with the continuous enrichment of the cross-sectional forms of the shelf columns and the application of high-strength steel, the compression columns are developing towards being lighter and having thinner walls, which easily leads to the overall instability of the uprights. Therefore, the stability of the compression column members becomes even more important.
Strength calculation: When conducting strength checks on the uprights of the shelves, depending on their different loading states, it is necessary to conduct checks respectively according to axial compression members and compression-bending members. The calculations adopt the relevant formulas in the "Technical Code of Cold-formed Thin-walled Steel Structures" (GB50018—2002).

Since the upright is the main load - bearing component of the shelf, its structural shape is relatively complex, and most of them are made of cold - formed thin - walled steel sections (with a certain amount of residual processing stress), and the loading conditions are also quite complex. Especially for high - rise shelves, with a large number of layers and heavy loads, this makes the design of the uprights complicated and the verification complex. Whether the values are reasonable or not is directly related to the safety of the structure.

The hole shapes usually adopt an inverted - V - shaped, diamond - shaped or inverted - trapezoidal shape, so that the long holes of the upright have a small angle with the vertical direction. After the hook is hung, it will automatically lock under the action of the gravity of the goods, and the contact between the hook and the long hole of the upright is a surface contact, with a better stress state, ensuring more stable and safe use. However, the opening of the hook holes has a great impact on the load - bearing capacity of the short columns of the upright. The load - bearing capacity after opening the holes is 70% - 95% of that without opening the holes, and the impact on the uprights of small specifications is even greater. Therefore, on the premise of meeting the load - bearing capacity of the cross - beam hooks, the size and number of the hook holes should be as small as possible to improve the overall load - bearing capacity of the shelf.

A lot of long holes (hook holes) and round holes are evenly distributed on the front of the upright, which are used to hang the hooks of the cross - beam and install safety pins.

From the cross - section point of view, there are many shapes of the cross - section of the upright. But in terms of the current market distribution, basically the mainstream profile is still the basic type of Wentu Shelf. Some of these profiles have a relatively simple structure and are mainly used for light - duty shelves; the multi - sided roll - forming structure is relatively complex, and the processing technology is also relatively complex, mainly used for medium - and heavy - duty shelves. Other shapes derived from the basic type mainly add bends on the longer edges to improve the stiffness and stability of the upright. In specific design, in addition to considering strength, stiffness and structural stability, generally, the influence of the specific forming process on the hole shape and the influence of the pre - processing of the blank on the product quality should also be considered, such as the influence of pre - punching and bending deformation not on the cold - bending roll line on the product quality, and the possible deformability of the pre - punching during the cold - bending process. Under the condition of ensuring the requirements of the fit dimension tolerance and the hole spacing, the design of the cross - section shape should take into account the requirements of different plate thicknesses, and the deformation adopts a fixed bending radius.

The upright is also the ultimate load - bearing support component of the detachable shelf, and its design is the key of the entire shelf system, which is directly related to the safety of the structure and the economy of use. The assembled shelf is mainly composed of basic parts such as upright frames and cross - beams and optional parts such as corner protectors, base angles, bracing, dividers, and shelves (steel or wood plates). The upright frame is the main load - bearing support part of the shelf, with a maximum load - bearing capacity of 21 tons. As the height of the shelf increases and the number of layers increases, the uprights bear heavy loads, and most of them are made of cold - formed, punched, thin - walled steel sections, with a certain amount of residual processing stress, and the actual stress conditions are also relatively complex. Therefore, the design and selection of the uprights become the key of the entire shelf system, which is directly related to the safety of the structure and the economy of use.

How to Select Heavy - Duty Shelf Uprights! Heavy - duty shelves are an important carrier for improving warehouse utilization efficiency and enhancing warehouse access efficiency, and they have been more and more widely used in various industries. The detachable shelf, also known as the modular shelf, can adjust the layer height according to the pitch at will, so that the layer spacing of the shelf can be adjusted arbitrarily according to the size of the placed goods, increasing the randomness and flexibility of inventory. At the same time, it has the advantages of small component size, high warehouse utilization rate, convenient manufacturing, interchangeable assembly and short installation period, and has become the most widely used type of shelf.

Shelf official website: www.jyhshelf.com
Shelf, shelf factory, storage shelves, heavy-duty shelves, supermarket shelves, snack shelves, Jiangsu shelf factory.

Previous:Benefits of Using Electrostatic Spraying for Warehouse Shelves

Next:The description of gravity rack