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Hydraulic lifting system of attached tower crane

A tower crane and attached technology, applied in cranes, mechanical equipment, fluid pressure actuating devices, etc., can solve the problems of attached tower cranes and personnel safety hazards, unfavorable energy saving, shortened hydraulic system life, etc. The effect of reducing safety hazards, increasing safety and reducing commutation time

Active Publication Date: 2015-03-11
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Hydraulic lifting system of attached tower crane
  • Hydraulic lifting system of attached tower crane
  • Hydraulic lifting system of attached tower crane

Examples

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Embodiment 1

[0043] The reference signs in the 4 drawings of this embodiment are as follows: fuel tank 1, filter 2, engine 3, one-way quantitative pump 4, first overflow valve 5, third electromagnetic reversing valve 6, pilot overflow valve 7. Pressure gauge 8, accumulator 9, stop valve 10, first electromagnetic reversing valve 11, first hydraulic control check valve 12, PLC controller 13, second electromagnetic reversing valve 14, first check valve 15a, the second one-way valve 15b, the third one-way valve 15c, the fourth one-way valve 15d, the speed regulating valve 15e, the fifth one-way valve 16a, the sixth one-way valve 16b, the seventh one-way valve 16c, the Eight one-way valves 16d, electromagnetic speed regulating valves 16e, second hydraulically controlled one-way valves 17, third hydraulically controlled one-way valves 18, fourth hydraulically controlled one-way valves 19, fifth hydraulically controlled one-way valves 20, working cylinders 21. Spare oil cylinder 22, first positio...

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Abstract

The invention provides a hydraulic jacking system for an attached tower crane, which includes a working oil cylinder and a backup oil cylinder. The working oil cylinder and the backup oil cylinder are connected to the hydraulic system at the same time; the hydraulic system includes a hydraulic circuit, a control circuit, and a first bridge. A rectifier synchronization circuit, a second bridge type rectification synchronization circuit, a first locking circuit connected to the working cylinder, and a second locking circuit connected to the backup cylinder, in which the hydraulic circuits are respectively connected to the first bridge type rectification synchronization circuit and the second bridge type Rectifier synchronization loop, the first bridge type rectification synchronization loop is connected to the first locking loop, and the second bridge type rectification synchronization loop is connected to the second locking loop. When the lifting tonnage is small, a single cylinder is used to work; when the lifting tonnage is large, dual cylinders are used to work at the same time; when the working cylinder fails, the backup cylinder is used to work. The invention increases the safety of the hydraulic system, solves the problem of synchronization of the two cylinders, saves energy, and improves the 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66C23/62F15B11/028F15B11/22F15B1/02
Inventor 殷晨波王宝家夏勇葛中原吴福宝叶民镇
Owner NANJING TECH UNIV
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