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Packing line commonly used lifting mechanism composition and principle description
[China Packaging Network News] There are three commonly used types of automated packaging line lifting mechanisms.
(1) Mechanical Lifting Mechanism
The mechanical lifting mechanism is one of the most traditional systems. It typically consists of a cylindrical cam, a follower, and a sliding assembly. The basic design includes a bottle holder, a compression spring, a slider, a slide seat, a connecting rod, a sliding tube, a rolling bearing, and a cam guide. When the rolling bearing moves along the cam guide, it causes the sliding tube to move. This movement pushes the upper slider, which in turn lifts the support table. When the slider disengages from the sliding tube, the support table lowers due to gravity and the force of the compressed spring. This system is simple in structure and cost-effective to manufacture, but it suffers from high mechanical wear and frequent spring failures. Additionally, it may cause foaming or splashing when handling liquid materials, making it suitable only for non-gas-liquid filling applications.
(2) Pneumatic Lifting Mechanism
The pneumatic lifting mechanism uses compressed air to raise and lower the bottle holder. It consists of a cylinder, piston, connecting rod, bottle support table, intake manifold, and a pressure valve. Before filling, the valve is closed, and the exhaust valve is opened to allow compressed air into the cylinder chamber, lifting the piston and bottle holder. After filling, the exhaust valve is closed, and the main valve opens to equalize the pressure between the upper and lower chambers. Under the weight of the filled container, the bottle holder quickly descends to the filling table level. However, this mechanism is sensitive to pressure fluctuations. High pressure can cause impact, while low pressure may prevent proper contact between the container and the filling valve.
(3) Mechanical-Pneumatic Combined Lifting Mechanism
This hybrid system combines the advantages of both mechanical and pneumatic mechanisms. It features a more complex structure but offers smoother and faster motion for the bottle holder. It includes components such as a plunger, sleeve, hollow screw, gasket, cam guide, and rolling bearing. Compressed air enters through a ring pipe and flows into the upper space of the sleeve, allowing the bottle table to rise. After filling, the compressed air supply is stopped, and the decompression valve is opened. The cam guide and rolling bearing then control the controlled descent of the bottle holder, ensuring energy efficiency and stability. This system is widely used in modern packaging lines due to its reliability and performance.