Hydraulic lifting system of attached tower crane

Abstract

The invention provides a hydraulic lifting system of an attached tower crane. The hydraulic lifting system comprises a working oil cylinder and a spare oil cylinder, wherein the working oil cylinder and the spare oil cylinder are synchronously connected with a hydraulic system; the hydraulic system comprises a hydraulic loop, a control loop, a first bridge type rectification synchronizing loop, a second bridge type rectification synchronizing loop, a first locking loop connected with the working oil cylinder, and a second locking loop connected with the spare oil cylinder, wherein the hydraulic loop is respectively connected with the first bridge type rectification synchronizing loop and the second bridge type rectification synchronizing loop; the first bridge type rectification synchronizing loop is connected with the first locking loop; the second bridge type rectification synchronizing loop is connected with the second locking loop. When the lifting tonnage is lower, single cylinder is used for working; when the lifting tonnage is higher, two cylinders are adopted for synchronously working; when the working oil cylinder is broken down, the spare oil cylinder is adopted for work. The hydraulic lifting system improves the safety of the hydraulic system, solves the synchronism problem of two cylinders, saves the energy, and improves the service efficiency of the system.

Description

technical field [0001] The invention relates to the field of tower cranes, in particular to a hydraulic jacking system of an attached tower crane. Background technique [0002] With the rapid development of economic construction, my country's urbanization and industrialization continue to improve, which objectively leads to an increase in the demand for tower cranes. However, the safety of tower cranes is becoming more and more prominent. Once an accident occurs in the tower crane, it will definitely bring huge economic losses and casualties, which will have a major impact on society. The hydraulic jacking mechanism of the tower crane is one of the causes of major accidents to the tower crane. In the current market, most of the attached tower cranes use a single hydraulic cylinder jacking hydraulic system, and a balance valve is connected in series in the hydraulic system to prevent the crane from falling at a high speed, so as to ensure that the entire hydraulic jacking sy...

AI Technical Summary

Problems solved by technology

However, the above-mentioned method is only suitable for small tonnage and no hydraulic accidents. Once the hydraulic cylinder oil leaks seriously, the hydraulic rod breaks, the hydraulic system fails, and the tonnage is large, the attached tower crane and the tonnage will be damaged. Serious potential safety hazards for personnel, which will have a huge negative impact on society

And when the jacking tonnage is large, using a single hydraulic cylinder for jacking will shorten the life of the hydraulic system, which is not conducive to saving energy

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