Steel buckets, commonly known as convenient buckets and flower basket buckets, are named because their bucket covers are in the shape of petals.

Open steel bucket with tight ear covers

【Patent Number】CN99119967

【Claims】

An open steel bucket ear cover, which has a circular plane in the middle, a circle of arc-shaped convex grooves around it and a series of ears extending below the outer wall of the convex groove, and its nominal diameter D is the inner diameter of the matching open steel bucket, characterized in that: the outer diameter d of the circular plane is (0.8-0.9) D; a circle of inclined surfaces extending upwards is provided at the outer edge of the circular plane, and the height h of the inclined plane is (0.01-0.03) D; a reverse groove is provided to connect the inclined plane and the convex groove, and the depth a of the reverse groove is (0.03-0.06) D and the width b is (0.02-0.04) D. 2. The open steel bucket ear cover according to claim 1, characterized in that the inclination angle θ of the inclined plane is 35°-65°. 3. The open steel bucket ear cover according to claim 1, characterized in that a circle of plane is provided between the inclined plane and the reverse groove. 4. The open steel bucket ear cover according to claim 2 or 3 is characterized in that: a circle of arc surface is set between the above-mentioned reverse groove and the above-mentioned convex groove; the outer diameter of the reverse groove connected with the arc surface is slightly smaller than D.

【manual】

The present invention relates to packaging equipment, in particular to barrel covers for packaging barrels.

As commodity production develops, people pay more and more attention to its appearance packaging. In today's market, it is difficult to see unpackaged commodities. In particular, liquid products need to be packaged in containers to achieve transportation and circulation. For example, paints, coatings and other commodities are such that they need to be contained in barrels and cans for transportation and sales. In the past, the barrels for containing paint usually had a hole diameter at the open end that was smaller than the inner diameter of the barrel, which often left a surplus of paint in the barrel that could not be used up. Moreover, the barrels with "bottleneck" obstacles at the open end have many manufacturing processes and low utilization rate of the plate. At present, a liquid packaging container with a large capacity of more than 10 liters, an open steel lifting bucket, is gradually becoming popular in China. The hole diameter at the open end of this open steel lifting bucket is equal to the inner diameter of the barrel, that is, there is no "bottleneck" obstacle at the open end. Since this barrel is easy to manufacture, has a high material utilization rate, low cost, and is very convenient to fill and use, especially the liquid material in the barrel can be used up, not only manufacturers are happy to use it, but also users are very welcome. This barrel uses a tight ear cover stamped from a thin steel plate to seal the barrel mouth. The tight ear cover has a plane in the middle and a circle of arc-shaped convex grooves around it. A series of tight ears extend from the drooping outer wall of the convex groove. When the tight ear cover is placed on the open end of the open steel lifting bucket, a circle of rolled ears around the open end of the open steel lifting bucket is just placed in the arc-shaped groove on the back of the convex groove around the tight ear cover; then the above series of tight ears are bent against the above rolled ears, so that the tight ear cover can be tightly combined with the open steel lifting bucket. Usually, a soft sealing ring is placed in the arc-shaped groove on the back of the convex groove to enhance the sealing performance. Due to the large diameter of the open steel lifting bucket and the fact that there is a plane inside the convex groove of the tight ear cover, the internal pressure that this packaging method can withstand is limited, generally around 30kPa. This is fully adapted to land transportation and general circulation processes, but it is far from the requirements of international maritime transportation. According to the "International Maritime Dangerous Goods Code", Class III packaging barrels containing chemical products such as petroleum, paint, ink, and coatings are required to withstand a pressure of 100kPa, so this large-caliber open steel bucket has become a roadblock to expanding foreign trade exports. In order to solve this problem, various packaging manufacturers have proposed many solutions, all of which are to punch out a series of reinforcing ribs on the plane in the middle of the tight ear cover to increase its rigidity and improve the pressure-bearing performance. According to the national standards to be issued soon, these improvement plans can only reach about 60kPa at most.The creator of the present invention has proposed a "high-pressure resistant reinforced tight ear cover". Compared with the general tight ear cover, this tight ear cover still changes the plane in the middle of the cover body into a concave arc spherical surface, and a reverse groove is set between the arc spherical surface and the convex grooves around the cover body. This "high-pressure-resistant reinforced tight-ear cover" can greatly improve the pressure resistance of the packaging barrel, but to meet the 100kPa requirement stipulated in the "International Maritime Dangerous Goods Code", it is still necessary to press several circles of reinforcing ribs on the concave arc spherical surface, and the material thickness must be about 1mm. However, the material thickness used for the open steel bucket and the tight-ear cover is only 0.4-0.5mm. So in terms of the amount of material used, it needs to be doubled. Moreover, the deformation force will double if the material thickness is doubled, but the shape of the high-pressure-resistant reinforced tight-ear cover is much more complicated than the existing tight-ear cover. It needs to be deformed by force almost everywhere to make the flat blank into the required shape. Therefore, the energy consumption of punching is far from doubled. The original punching equipment is not competent. In addition, the thickening of the material will lead to faster mold loss and low life. At the same time, the sealing and opening of the cover will increase the difficulty. All this means reduced productivity, increased manufacturing costs, a sharp increase in resource consumption and inconvenience in use, which will inevitably be difficult to promote and apply. The object of the present invention is to provide a tight ear cover for an open steel bucket, which is not only simple in structure and has low energy consumption for punching and forming, but also uses a material with a thickness of about 0.5 mm, which can make the open steel bucket withstand a pressure of 100 kPa and meet the requirements of the International Maritime Dangerous Goods Code. The object of the present invention is achieved as follows: a tight ear cover for an open steel bucket, which has a circular plane located in the middle, a circle of arc-shaped convex grooves located around, and a series of tight ears extending below the outer wall of the convex groove, and its nominal diameter D is the inner diameter of the matching open steel bucket, characterized in that the outer diameter d of the circular plane is (0.8-0.9) D; a circle of inclined surfaces extending upward are provided at the outer edge of the circular plane, and the height h of the inclined plane is (0.01-0.03) D; a reverse groove connecting the above-mentioned inclined plane and the convex groove is provided, and the depth a of the reverse groove is (0.03-0.06) D and the width b is (0.02-0.04) D. The above-mentioned open steel bucket ear cover is characterized in that: the inclination angle θ of the above-mentioned inclined plane is 35°～65°. The above-mentioned open steel bucket ear cover is characterized in that: a circle of plane is set between the above-mentioned inclined plane and the above-mentioned reverse groove. The above-mentioned open steel bucket ear cover is characterized in that: a circle of arc surface is set between the above-mentioned reverse groove and the convex groove; the outer diameter of the reverse groove connected with the arc surface is slightly smaller than D. The present invention only adds a circle of inclined plane and a circle of reverse groove on the basis of the existing general plane ear cover, and strictly controls the size of each corresponding part within a certain range, so that the pressure can be increased from 30kPa to 100kPa under the condition of the same material thickness. However, the molding energy consumption of the present invention does not increase much, and the original stamping equipment is fully competent, unlike the "high-pressure resistant reinforced ear cover" which requires investment in large-tonnage stamping equipment. Since the material thickness has not changed, although the blank area has increased slightly, the total material consumption has not increased considering the margin for cutting; compared with the "high-pressure resistant reinforced tight ear cover", the material is saved by half. The whole shape is simple, the mold is easy to manufacture, the mold wears less during use, and the service life is long. When sealing or opening, the force is the same as that of an ordinary flat tight ear cover; and the outer diameter of its reverse groove is smaller than the nominal diameter D of the tight cover, that is, smaller than the inner diameter of the open steel bucket, so it can be easily placed on the bucket mouth and clamped and packaged, so it is very convenient to use. The following is a detailed description of the present invention in conjunction with the accompanying drawings.

Figure 1 is a structural schematic diagram of the present invention.

FIG. 2 is another schematic structural diagram of the present invention.

FIG. 3 is a partial enlarged schematic diagram of the area marked A in FIG.2

FIG. 4 is a partial cross-sectional view of the present invention encapsulated on an open steel pail.

Embodiment 1. Referring to FIG. 1 , the present invention has a circular plane 2 located in the middle, a circle of arc-shaped convex grooves 5 located around, and a series of tightening ears 1 extending from the outer wall of the convex groove 5. Adjacent tightening ears 1 are spaced apart from each other by a certain gap. At the end of the tightening ear 1, an arc-shaped curling edge 6 is usually provided to enhance its rigidity. A sealing ring 4 made of soft materials such as rubber or plastic is provided at the arc concave portion on the back of the convex groove 5. The inner diameter D of the convex groove 5 is the nominal diameter of the tightening ear cover, which is equal to the diameter of the opening end of the matching open steel bucket. The outer diameter d of the circular plane 2 is (0.8-0.9)D. A circle of upwardly inclined planes 3 is extended from the outer edge of the circular plane 2. The height of the inclined plane is h=(0.01-0.03)D (see FIG. 3 ); its inclination angle θ=35°-65°, preferably 45°. A reverse groove 7 is provided between the inclined plane 3 and the convex groove 5. The depth a of the reverse groove 7 is (0.03-0.06)D, and the width b is (0.02-0.04)D. Embodiment 2. Referring to Figures 2 and 3, the present invention has a circular plane 2 located in the middle, a circle of arc-shaped convex grooves 5 located around, and a series of tightening ears 1 extending from the outer wall of the convex groove 5. Adjacent tightening ears 1 are spaced apart from each other by a certain gap. At the end of the above-mentioned tightening ears 1, an arc-shaped curling edge 6 is usually provided to increase its rigidity; but the curling edge 6 may also be omitted. A sealing ring 4 made of soft materials such as rubber or plastic is provided at the arc concave portion on the back of the above-mentioned convex groove 5. The outer diameter d of the circular plane 2 is (0.8-0.9)D. A circle of upwardly inclined planes 3 is extended from the outer edge of the circular plane 2. The height h of the inclined plane 3 is (0.01-0.03)D, and its inclination angle θ is 35°-65°, preferably 45°. A plane 9 parallel to the circular plane 2 is extended from the outer edge of the inclined plane 3. A reverse groove 7 with a depth of a = (0.03-0.06) D and a width of b = (0.02-0.04) D is provided. The inner wall edge of the reverse groove 7 is connected with the above-mentioned plane 9, and the outer wall edge is connected with the convex groove 5 by providing a circle of arc surface 8. Due to the provision of the arc surface 8, the outer diameter of the reverse groove is slightly smaller than the nominal diameter D, so that the present invention can be easily placed on the open end of the open steel lifting bucket during the barrel sealing assembly (see Figure 4). Then, a series of tight ears 1 are bent and tightly buckled on a circle of rolled ears 10 at the open end of the open steel lifting bucket 11 using a special sealing tool, so that the goods can be tightly packaged and can withstand a pressure of up to 100kPa.

Innovative Wave in Metal Packaging