Analysis of the connection method and buffer design of rotomolding box hinges

1. Common connection methods of rotomolding box hinges
The connection methods of rotomolding box hinges are diverse, aiming to meet the needs of different application scenarios, mainly including welding, bolt connection and injection molding.

Welding: Welding is a technology that melts and combines two or more metal parts by heating. In the manufacture of rotomolding box hinges, welding can provide extremely high connection strength and ensure the stability between the hinge and the box body. However, the welding process may produce stress concentration, affect the flexibility of the hinge, and once completed, it is not easy to make secondary adjustments or repairs. Therefore, when choosing a welding method, it is necessary to comprehensively consider material compatibility, welding process and subsequent maintenance costs.
Bolt connection: Bolt connection is a method of fixing the hinge and the box body together through fasteners such as bolts and nuts. This method is easy to install and disassemble, and is convenient for future maintenance and replacement. The strength and stability of the bolt connection depends on the specifications, materials and accurate control of the tightening torque of the bolts. In addition, a reasonable bolt layout can effectively disperse stress and improve the durability of the connection parts.
Injection molding: Injection molding is a manufacturing process in which molten plastic is injected into a mold and cooled and solidified to form the desired shape. For roto-molded boxes, the hinges are directly injection molded on the box body, which can achieve seamless integration of the hinges and the box body, and improve the compactness and aesthetics of the overall structure. Injection-molded hinges usually have good corrosion resistance and wear resistance, and the cost is relatively low, which is suitable for large-scale production.
2. The importance of buffer design in hinges
In addition to the choice of connection method, buffer design is also an important part of improving the performance of rotomolding box hinges. Buffer mechanisms, such as springs, rubber pads, etc., can effectively absorb and disperse the impact force during the opening and closing process, reduce the vibration and wear of the box body, and thus improve the stability and durability of the hinge.

Spring buffer: The spring buffer mechanism absorbs energy through the elastic deformation of the spring, slows down the opening and closing speed, prevents the impact sound generated when the box body is suddenly closed or opened, and protects the hinge and box structure from damage. The selection of the spring needs to consider its stiffness, stroke and service life to ensure that the buffer effect is long-lasting and stable.
Rubber pad buffering: Rubber pads are often used as buffer materials for the contact between hinges and boxes due to their good elasticity and wear resistance. Rubber pads can effectively isolate direct contact between metals, reduce friction noise, and provide a certain damping effect, making the opening and closing action smoother and quieter.
Comprehensive buffering design: In practical applications, it is often necessary to combine multiple buffering mechanisms, such as combining springs with rubber pads, to achieve the best buffering effect. In addition, the design of a reasonable buffering stroke and force adjustment mechanism is also the key to improving user experience and extending product life.