The lifting table is generally divided into two types: hydraulic lifting table and mechanical lifting table: the hydraulic lifting table is mainly a scissor lift table with an inclined cylinder structure and a cylinder straight top lifting table with a guide rail structure. It requires that the depth of the foundation pit is particularly deep, the oil cylinder is too long, and the cost is high. At present, this type of lifting platform is mainly used for installation close to the wall and is used as a vertical freight elevator. Hydraulic lift tables generally use scissor lift tables. This type of hydraulic lift table occupies a shallow foundation pit and is a preferred driving form for small and medium-sized lift tables. However, due to some inherent reasons in its structure, especially in large strokes It is subject to greater restrictions under the requirements and cannot meet the requirements of modern machinery for high speed, heavy load and large stroke. Due to the limitation of the reliability and stability of hydraulic components, the hydraulic lifting table also affects the application prospect of this type of equipment.
At present, there are advanced screw jacks as the driving unit, and multiple driving units form a large-scale lifting table lifting and driving equipment. However, the cost of the drive unit is expensive, and the material used for the core components of the drive unit has high requirements. Therefore, in the mechanical lift table, it is necessary to introduce a variety of new models that can meet the requirements of various table top shapes, have a simple structure, are easy to install, and have high positioning accuracy. The lift table is particularly important and necessary.
When designing the lifting platform, the energy conversion of the hydraulic system must be reasonably calculated. The purpose of hydraulic system performance estimation is to assess design quality. The estimated contents generally include: system pressure loss, system efficiency, system heat generation and temperature rise, hydraulic shock, etc.
The system pressure loss of the scissor lift platform includes the sum of the loss along the pipeline and the local loss and the local loss of the legal element. When calculating, different working stages should be calculated separately, and the pressure loss on the oil return road should be converted to the oil inlet road.
