Large Horizontal Water Tank Blow Molding Machine Popular Science

The large horizontal water tank blow molding machine is a heavy-duty forming equipment specially designed for producing large-capacity horizontal plastic water tanks. The tanks produced by it, characterized by their horizontal placement structure, are widely used in scenarios such as RV water storage, industrial equipment coolant storage, and agricultural irrigation transfer, with capacities typically ranging from 500L to 5000L. Such water tanks need to have properties like anti-bump, anti-leakage, and strong space adaptability. The horizontal water tank blow molding machine precisely meets these needs through its unique horizontal forming process, becoming the core equipment in the production of special water storage devices.
 
In terms of working principle, the large horizontal water tank blow molding machine is deeply optimized for the asymmetry of horizontal structures based on traditional hollow blow molding. Its production process mainly includes: high-density polyethylene (HDPE) or linear low-density polyethylene (LLDPE) is selected as raw materials, which are dried and then fed into a twin-screw extruder. They are melted and plasticized at a high temperature of 200-230℃ to form a uniform melt. Subsequently, the melt is pushed to a large horizontal die head and extruded into a tubular parison with a specific curvature. At this time, the equipment's 3D wall thickness control system is activated, dynamically adjusting the thickness of different areas of the parison according to the stress characteristics of the horizontal water tank (such as bottom load-bearing and side impact resistance). For example, the bottom thickness is increased by more than 30% compared to the side. Then, the horizontally opening-closing mold (different from the vertical mold's up-down opening, it adopts left-right opening in the horizontal direction) quickly closes to enclose the parison. Multiple groups of blow pins inject high-pressure air of 0.8-1.2MPa from different angles at the same time, making the parison fully expand and adhere to the inner wall of the mold, completely replicating details such as the horizontal curvature of the water tank, water inlets/outlets, and fixed brackets. After that, the multi-loop cooling system in the mold starts, and the water tank is quickly shaped through zone temperature control (the bottom cooling speed is faster than the top to avoid deformation caused by gravity). Finally, the mold opens horizontally, the robot takes out the finished product in the horizontal direction, and the production is completed after trimming, pressure testing and other processes.
 
The technical highlights of large horizontal water tank blow molding machines focus on "structural adaptation" and "precision control". Due to the asymmetrical structure of most horizontal water tanks, the mold design needs to accurately calculate the center of gravity. Therefore, the equipment is equipped with a servo-driven synchronous clamping system with a clamping force of over 8000kN, ensuring uniform force when the mold is closed and avoiding parison deviation. To solve the problem of sagging of horizontal parisons during extrusion, the equipment adopts a parison pre-support device, which uses adjustable idlers to lift the parison in real-time, and cooperates with the precise matching of extrusion speed and traction speed to ensure that the parison verticality error is ≤1mm/m. In addition, in response to the demand for lightweight water tanks in RVs and other scenarios, the equipment is equipped with an AI intelligent wall thickness optimization algorithm, which can reduce raw material consumption by 10%-15% on the premise of ensuring strength, thereby reducing costs and weight.
 
With the development of the special vehicle and outdoor equipment industries, large horizontal water tank blow molding machines are upgrading towards intelligence and customization. New equipment is equipped with an industrial vision inspection system, which can real-time identify parison defects and automatically adjust extrusion parameters. It supports modular mold design, and can quickly produce horizontal water tanks of different lengths and diameters by replacing mold components with different curvatures, meeting the space requirements of different models such as RVs and engineering vehicles. At the same time, the energy consumption of the equipment is reduced by more than 20%, and the waste heat from the extruder is used for raw material preheating through a waste heat recovery device, in line with the concept of green production. It can be said that the technological progress of large horizontal water tank blow molding machines provides a reliable production guarantee for the diversified needs of the special water storage field.