Preliminary Study on the Shape of Steel Barrel
Preliminary Study on the Shape of Steel Barrel
Wang Zhaoyu
The curling at both ends of the steel drum plays the role of winding the barrel body and the lid and the bottom of the barrel together in the steel shovel, and plays a role in strengthening the strength of the steel drum and preventing the leakage of the hem. The quality of the steel drum, in addition to the quality of the weld, the most important depends on the quality of the steel barrel curl. The quality of the steel drum is good. When the steel drum is stored and transported in petroleum products, dyes and chemical solvents, if it collides and falls, it will only cause the bead of the steel drum to be concave, without breaking and seeping. Leakage and other phenomena. If the quality of the steel drum is poor, the seam of the steel drum will break and leak when it collides or falls. Chemical substances will leak out of the environment and suffer compensation. Under this circumstance, higher requirements are placed on steel drums for packaging and transporting chemical products and petroleum products. Therefore, the shape of the steel barrel crimping is being studied at home and abroad, and efforts are made to improve the ability of the crimping to resist fracture and leakage. According to domestic and foreign reports and information, there are dozens of shapes of curling, and it is said that the shape of the steel barrel is good. Some analysis and research on the shape of the curling edge will be beneficial to the development and progress of the barrel industry in China.
To analyze and study the shape of various crimps, the same test face conditions and standards should be used. According to the situation of domestic and foreign materials. Steel drums manufactured in various countries have their own inspection standards. Such as Wanli (UK) Co., Ltd. Steel barrels Japan's Maeda Iron Works, the US Department of Transportation rules and marine standards. In these authoritative standards, although there are differences, the criteria for falling face test are consistent. We take the intermediate value of the drop height in the drop test face for analysis and comparison, and study the shape of the steel barrel curl. The standard is as follows: After filling the water, the steel drum is tilted down from a height of 1.2 meters, so that the convex edge near the top of the bucket is the impact point that touches the ground. The same test was then performed on the bottom side of the barrel (as shown in Figure 1).
Figure 1 Steel drum drop test
Following this principle, we know from mechanics that steel drums fall into the concrete floor in a short period of time, which will produce an impact. At this time, the bead of the steel drum is also subjected to a reaction force. Such a large force will deform the bead of the steel drum and even break the bead. Since the collision and fall of the steel drum during transportation and storage are random, it is impossible to be the same as the test conditions, and the concave edge is caused by the falling of the curling edge, and the force is in a complicated state, and the calculation is laborious and time consuming. Therefore, it is not necessary to spend a lot of effort to calculate the amount of deformation in the steel drum drop test. However, in the process of analyzing the curling of the steel drum: comparing the curling of the steel drum to a static state for some deformation and twisting amount, we will have a clearer understanding of the shape of the steel drum curling.
It can be seen from the calculation that the deflection of the steel barrel bead is caused by the bending moment. The circular curling is only smaller than the rectangular curl when θ=90°, and the deflection is even when θ=0°, θ=45°. Greater than a rectangular curl. Thus the strength of the round bead is not increased compared to the rectangular bead, and in some ranges the strength of the bead is reduced.
Through calculation, we can also see that when the torsion angle of θ=0° round curl is about larger than the rectangular curl, when θ=45°, the twist angle of the circular curl is zero, and the twist of the rectangular curl The angle is 7.7964°. Therefore, the ability of the round bead to resist torsion is better than that of a rectangular bead.
After the above analysis, the circular bead is inferior to the rectangular bead in strength, but it is superior to the rectangular bead in terms of distortion. From the cutting plane of the steel drum curl in the drop test, we can also see that the round curl has a small torsion angle due to the large number of layers of the curling edge, and the ability to resist leakage at the curling edge is improved after the falling. On the other hand, the rectangular beading is easy to cause leakage because the number of bonding layers is small and the torsion angle is large. From the above analysis, it is basically the same.
In order to improve the ability of steel drums to resist leakage, many methods have been thought out at home and abroad. For example, the barrel body of the steel drum and the bottom of the bucket and the combination of the lids are rolled so as to be well combined when the steel drum is crimped to solve the leakage problem. However, due to its complicated processing methods and large workload, it was eliminated. At present, in the barrel making industry, it is convenient to process and produce steel drums for the seven-layer round curling of the leakage prevention effect (as shown in Fig. 2).
Figure 2 Schematic diagram of steel drum round
In summary, the factors affecting the stiffness and torsion angle of the bead, in addition to the material quality of the steel drum itself, are mainly the moment of inertia and the moment of inertia of the bead, as well as the position of the steel bar. Therefore, to improve the anti-leakage ability of the steel drum, the moment of inertia and the moment of inertia should be increased, and the position of the force point should be reduced to reduce the deflection and torsion angle of the bead. From this point of view, the crimping of steel drums has been studied and modified at home and abroad to produce a variety of crimped shapes. In order to improve the leakage resistance of the steel drum crimping, the quality of the steel drum is guaranteed.
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