Comparison of hydrostatic transmission and dynamic pressure transmission of tire loader

As a versatile mobile machine, the wheel loader is extensively used in earthmoving, loading, lifting, and transporting of loose or piled materials. It combines high maneuverability with strong traction, making it ideal for dynamic work environments. Its ability to quickly shift between tasks under high-speed conditions enhances its efficiency and practicality, which are key factors in its widespread use across various industries. The hydrostatic drive system, especially when paired with a subsequent load-shifting transmission, offers several advantages over traditional hydrodynamic torque converter systems. This technology has been successfully implemented in wheel loaders with power outputs up to 60 kW, proving its reliability and performance. As power requirements increase, the application of hydrostatic transmission becomes more complex, often requiring an additional shifting mechanism to handle the wide torque range. Despite this, in loaders with engine power ranging from 60 kW to 100 kW, static drive systems are commonly used due to their simplicity and effectiveness. However, in more powerful models—such as those with 200 kW engines, 25,000 kg load capacity, and a top speed of 45 km/h—hydrostatic or advanced torque converter systems are now the standard. These systems offer better control and efficiency, meeting the demands of heavy-duty operations. Compared to dynamic pressure transmission, hydrostatic systems provide a broader control range, allowing for smoother and fewer gear shifts. Their compact design enables integration into modern wheel loaders, even in non-traditional orientations. Additionally, closed-loop hydrostatic systems can transmit torque in both directions, which is particularly useful during braking. This feature helps reduce brake wear and energy loss by redirecting hydraulic energy back into the system, lowering overall operating costs. During braking, the hydrostatic system can generate a "support" force that assists the driving unit, further reducing the need for mechanical braking. This not only extends the life of the brakes but also improves safety and efficiency. Moreover, the flexibility of hydrostatic controls allows for precise management of engine power at any speed, making it a highly adaptable solution. When comparing torque converters and hydrostatic drives, the latter typically provides about 80% of the loader's weight in traction, which is sufficient for most tasks while preventing wheel slippage during material handling. This is especially important when cutting into piles, where maintaining grip is critical. In contrast to dynamic pressure systems, where traction force drops significantly as motor speed decreases, hydrostatic systems maintain maximum traction even under hydraulic pressure. This makes them ideal for heavy-load operations, improving productivity and efficiency. Torque converters have a quadratic relationship between speed and torque capacity, meaning they can only fully utilize engine power at certain speeds. Below that point, both torque and speed drop sharply, limiting performance. Hydrostatic transmission, on the other hand, can theoretically cover the entire engine’s performance curve, offering flexible speed and torque distribution. When combined with advanced open- and closed-loop controls, it also helps reduce noise and energy consumption. By optimizing motor speed, drivers can simply adjust the accelerator to meet their needs, without worrying about complex gear shifts. The goal of transmission optimization is to ease the driver’s workload, improve working conditions, and allow them to focus on critical tasks. In addition to performance benefits, modern hydrostatic systems are increasingly cost-effective compared to torque converter alternatives, making them a preferred choice for future development.

PE Shink Film

PE heat shrink film, also known as polyethylene heat shrink film, is a type of plastic film that is used for packaging and wrapping products. It is made from polyethylene, a thermoplastic material that becomes soft and pliable when heated and then shrinks tightly around the item it is covering as it cools.

PE heat shrink film is commonly used in various industries, including food and beverage, pharmaceuticals, electronics, and retail. It provides protection and tamper-evident packaging for products, ensuring their integrity during transportation and storage.

The film is typically applied using heat shrink machines or heat guns, which apply heat to the film, causing it to shrink and conform to the shape of the product. The film has excellent clarity, allowing for easy visibility of the packaged item, and it can be printed on for branding and labeling purposes.

customized heat shrinkable Water, beverage packaging

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