Telescopic arm internally provided with three hydraulic cylinders and used for lorry-mounted crane

Abstract

The invention discloses a telescopic arm internally provided with three hydraulic cylinders and used for a lorry-mounted crane. The telescopic arm comprises a basic arm body, five joints of telescopic arm bodies, the three telescopic oil cylinders, a telescoping inhaul cable, a contracting inhaul cable, a rope row and a movable pulley. The five joints of telescopic arm bodies are sleeved with the basic arm body. The first telescopic oil cylinder, the second telescopic oil cylinder and the third telescopic oil cylinder are arranged in the five joints of telescopic arm bodies from top to bottom in the longitudinal direction. Telescoping of the first-joint telescopic arm body, the second-joint telescopic arm body and the third-joint telescopic arm body is controlled by the telescoping actions of the first telescopic oil cylinder, the second telescopic oil cylinder and the third telescopic oil cylinder respectively. By means of cooperation of the third telescopic oil cylinder, the telescoping inhaul cable, the contracting inhaul cable, the rope row and the movable pulley, a telescoping mechanism with the oil cylinders provided with the multiple sets of inhaul cables is formed, the fourth-joint telescopic arm body and the fifth-joint telescopic arm body are controlled by telescoping of the third-joint telescopic arm body, and synchronous telescoping with the third-joint telescopic arm body is guaranteed. The telescopic arm has the beneficial effects that the structure is simple and compact, the telescoping work efficiency of the arm bodies is improved, the work intensity is lowered, the load telescoping capability and the lazy arm telescoping reliability of a middle-long-amplitude lazy arm are obviously improved, and the overall service life is obviously prolonged.

Description

technical field [0001] The invention relates to a telescopic arm, in particular to a telescopic arm for a truck-mounted crane with built-in three hydraulic cylinders. Background technique [0002] The truck-mounted crane transport vehicle refers to a special-purpose vehicle equipped with a truck-mounted crane, which can realize the self-loading, unloading and transportation of goods. It not only has the transportation function of an ordinary truck, but also has the lifting and loading and unloading function of a crane. In addition to completing the loading and unloading of the cargo of the vehicle, it can also complete the loading and unloading of the cargo between vehicles; Transport vehicles can greatly improve transportation efficiency, reduce handling costs, reduce labor intensity, and ensure operational safety. Therefore, it is widely used in the unloading of goods, emergency rescue and long-distance transfer of goods in transportation, civil engineering, electric powe...

AI Technical Summary

Problems solved by technology

The first type is more suitable for folding-arm truck-mounted cranes, but due to the limitations of installation space, arm length, own weight, overall size, telescopic speed and other factors, it is not suitable for straight-arm cranes with large-tonnage four-section and above telescopic arms. truck mounted crane

The second and third schemes must rely on two or more sets of telescopic cables to drive the multi-section boom, which is more complicated to assemble, and after a certain period of use, it is also necessary to repeatedly adjust the telescopic cables to achieve Appropriate tightness, large workload and high requirements on the operator's own ability, and the telescopic cable has a great influence on the working conditions. It needs to be lifted up at a certain angle and the load should not be too large. The steel wire rope is under severe stress and is easily damaged. Because the steel wire rope is a flexible part, the arm body is unstable during the expansion and contraction process.

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