Steel drum structure without residue
Yang Wenliang
At present, there are problems in the closed steel drums at home and abroad that there are imperfect structures in which the contents cannot be poured out. The residual residue in the barrel after the steel drum is used not only causes waste of the contents, but also causes trouble for reuse or recycling, and pollutes the environment.
This paper designs a brand-new structure. Under the condition that the steel barrel production equipment and process can meet the requirements, the top of the barrel is changed from the original flat top to the streamlined vault, so that the barrel is at the lowest point when it is dumped. , thereby solving the problem that the residue in the barrel cannot be poured out. At the same time, this structure also solves the problem of infiltration of rainwater accumulated on the top of the barrel when the steel drum is placed in the open air.
The current steel drum structure at home and abroad is shown in Figure 1. Both the bottom of the bucket and the top of the bucket are flat. No matter how the bucket is tilted, the liquid in the bucket is always dirty. Practice has shown that there are always 0.5-1 liters (referred to as 200 liter steel drum) residues in the barrel, as shown in Figure 2. In order to pour the residue in the barrel, a small hole is often cut in the top edge of the barrel, so that the steel barrel can not be reused, resulting in waste.
Figure 1 Current standard steel drum structure
Figure 2 Schematic diagram of the residue left when the steel drum is dumped
The contents are not clean. When standing in the open air, the rust or the contents of the steel barrel are infiltrated due to the accumulation of rainwater. The reason is that the upper edge of the barrel is lower than the upper edge of the top of the barrel. As shown in Figure 1.
In order to solve the problem of residue in the barrel, we carried out a series of theoretical discussions and practical experiments, and designed a barrel top structure as shown in Figure 3. This structure changes the original flat top to a streamlined arch. When the steel drum is tilted, the liquid in the barrel can be completely poured out (as shown in Fig. 3), thereby solving the problem of residue in the barrel. In addition, when the steel drum is placed in the open air, it will not infiltrate due to the accumulation of rainwater.
Figure 3 does not leave residual liquid when the steel drum is dumped
Figure 4 Schematic diagram of the top structure of the residual liquid tank
After theoretical research, when the main dimensions of the structure are designed as follows, the best results can be achieved (as shown in Figure 4).
h = 19mm
R=90mm
r=10mm
The above dimensions are designed according to the modification of the 200-liter closed steel drum in GB325. Other related dimensions are the same as national standards and may not be changed.
The design of this structure takes into account the specific conditions of the production process and equipment of China's steel drum manufacturers. In the case of equipment tooling and process changes, the production can be smoothly modified. The main changes in its equipment and tooling are as follows:
1. Changes in the stamping die at the top of the barrel.
Since the top of the bucket is changed from the original flat top to the vault type, the mold should also be modified accordingly, that is, a counter-stretching punch is added, and other parts can be temporarily changed. If possible, a new mold can be designed and manufactured to recalculate the blanking size (the blanking size is slightly larger than the original size when considering thinning).
2. Changes in the sealing machine tooling.
Just change the shape of the sealing machine to press the steel ring of the drum. Because the top of the original barrel is flat, the steel ring is also flat. To produce the arched top steel drum, the steel ring should also be changed to the arch shape corresponding to the top of the barrel.
3. Changes in other tooling.
Due to the differences in the production equipment of each factory, for the general domestic equipment, the above tooling molds can be modified. However, some manufacturers may have to modify other tooling, such as leak testing machine, barrel punching and pressing die, pre-roller, etc. But the changes are not too big, and you don't have to invest too much.
Due to the wide variety of steel drums in China, the specific bucket top design schemes cannot be given one by one. This paper only designs one kind, and further work is needed for further implementation.
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