Mechanical jacks and hydraulic jacks are two prevalent types of jacks currently in widespread use. These two jack types operate on distinct principles and serve different application areas. A common inquiry among users is regarding the difference between a mechanical jack and a hydraulic jack, and whether they can be used interchangeably. Let’s delve into this topic in greater detail below.
To compare the screw jack, a paradigmatic example of the mechanical jack, with the hydraulic jack, we consider its operation and characteristics. The screw jack relies on manpower to rotate the screw pair, utilizing the screw or nut sleeve as the lifting mechanism. Ordinary screw jacks are capable of supporting heavy loads due to their thread self-locking feature, exhibiting a straightforward structure. However, they suffer from low transmission efficiency and sluggish return speeds.
The self-lowering screw jack lacks a self-locking mechanism but incorporates a brake for safety. Upon releasing the brakes, the weight descends automatically, significantly reducing the return trip time. Nevertheless, this jack’s structure is relatively intricate. Its lifting capacity, reaching up to 100 tons, enables it to support heavy objects for extended durations, making it a widely utilized tool.
The hydraulic jack operates through a hydraulic pump, which can be powered by either manpower or electricity. This pump is connected to a hydraulic system, and it utilizes either a cylinder or a piston as the jacking mechanism. Hydraulic jacks can be categorized into two types: integral and separate. In the integral type, the pump is seamlessly integrated with the hydraulic cylinder. By contrast, the separate type involves the pump being detached from the hydraulic cylinder but still connected via a high-pressure hose.
The hydraulic jack boasts a sleek and compact design, making it capable of lifting heavy objects effortlessly. Its lifting capacity has reached an impressive 750 tons, and it exhibits high transmission efficiency, leading to its widespread usage. Nevertheless, it’s prone to oil leakage and is not recommended for prolonged support of heavy loads.
In summary, mechanical jacks are capable of supporting heavy objects for extended periods, albeit with a comparatively lower transmission efficiency. Conversely, hydraulic jacks may not sustain heavy loads for as long, yet they excel in terms of transmission efficiency.
