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Lifting jack is a kind of hydraulic jack of hydraulic support. Use position of lifting jack: bridge position of base. Lifting jack is divided into supporting jack and general jack according to its function and stress condition in hydraulic support. General jack refers to the hydraulic cylinder used to make the hydraulic support realize its function without making the support produce supporting force, such as side push jack, telescopic beam jack, anti-inverted jack, anti-slip jack, lifting jack, board jack, pulling back slip jack; Support jack refers to the balance jack or hydraulic cylinder with ball hinge used to make the hydraulic bracket produce auxiliary support force, such as balance jack, front beam jack, guard jack, tail beam jack. Generally, a safety valve is fitted to the supporting jacks, but a safety valve is not normally fitted to the jacks. There is no difference in the structure of these two kinds of jacks, but they are stressed in different ways.

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