A hybrid hoisting hydraulic system and a crane using the same

Abstract

The invention discloses a hybrid winch hydraulic system, which includes a winch open-type lifting hydraulic system circuit, which is used to accurately drive the winch (1) to lift: the winch (1) falls and returns the oil directly to the oil tank, It can effectively reduce the pressure loss of the system; the closed hydraulic system circuit of the winch is used to control the fall of the winch (1): the return oil circuit of the winch (1) does not pass through the balance valve (3), but passes through the variable pump (8 ) to adjust the speed and convert the gravitational potential energy of the winch (1) into the kinetic energy of the engine (10), thereby reducing the power output of the engine (10); the invention also discloses a crane using the system; The combination of the system and the semi-closed hydraulic system can minimize the unnecessary pressure loss in the system, reduce the calorific value of the system, and reduce the fuel consumption rate of the engine.

Description

technical field [0001] The invention relates to a crane hydraulic system, in particular to a hybrid winch hydraulic system and a crane using the system. Background technique [0002] The hoisting and luffing systems of cranes are limited by cost and technology, and generally adopt an open system structure. Although the open hydraulic system has the advantages of flexible and precise control when driving forward, it often requires Set the balance valve for throttling and speed regulation, so as to control the falling speed of heavy objects. [0003] Therefore, throttling and speed regulation will inevitably bring about a large power loss. The lost power will be converted into heat, and the energy will be transferred to the hydraulic oil, causing the hydraulic oil to heat up rapidly. In severe cases, the reliability of the hydraulic components will be greatly reduced, and the The service life cannot meet the requirements of use. [0004] Usually, when designing an open syste...

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Problems solved by technology

[0003] Therefore, throttling and speed regulation will inevitably bring about a large power loss. The lost power will be converted into heat, and the energy will be transferred to the hydraulic oil, causing the hydraulic oil to heat up rapidly. In severe cases, the reliability of the hydraulic components will be greatly reduced, and the The service life cannot meet the requirements of use

[0004] Usually, when designing an open system, in order to reduce the oil temperature rise of the system, it is often necessary to increase the power of the radiator, and at the same time increase the additional driving power and design cost, which obviously does not meet the current requirements for energy saving and emission reduction.

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