Boom variable-amplitude hydraulic system and crane

A hydraulic system and boom technology, applied in the field of construction machinery, can solve problems such as violent shaking of the boom, affecting control stability and micro-movement

Active Publication Date: 2015-10-21
ZHEJIANG SANY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the present invention proposes a jib luffing hydraulic system and a crane to solve the problem that

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  • Boom variable-amplitude hydraulic system and crane

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Embodiment Construction

[0020] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0021] Combine below figure 1 , the preferred embodiment of the present invention will be further described in detail. The boom luffing hydraulic system in this preferred embodiment, one is to solve the problem that the boom often shakes violently during the lowering process of the boom, which seriously affects the control stability and micro Mobility issue.

[0022] Such as figure 1 As shown, the jib luffing hydraulic system specifically includes: the main pump 5, the main valve 4, the luffing cylinder 1, the fuel tank, the first oil circuit, the second oil circuit, the first oil circuit and the first cavity of the luffing cylinder 1 The oil port is connected, the second oil circuit is connec...

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Abstract

The invention discloses a boom variable-amplitude hydraulic system. The system comprises a main pump, a main valve, a variable-amplitude oil cylinder, a first oil way and a second oil way. The first oil way is connected with a first cavity oil port of the variable-amplitude oil cylinder. The second oil way is connected with a second cavity oil port of the variable-amplitude oil cylinder. The first oil way is connected with a first work oil port of the main valve. The second oil way is connected with a second work oil port of the main valve. The main pump is connected with an oil inlet of the main valve, and a pressure control valve is arranged in the first oil way. The hydraulic system further comprises a servo pump and a servo oil way. The servo pump supplies oil to the servo oil way which is connected with a pilot oil port of the pressure control valve. A hydraulic valve is arranged in the servo oil way and controls the opening degree of the pressure control valve. The hydraulic system solves the problem that a balance valve in the prior art is frequently opened and closed and accordingly a beam waggles, and improves boom variable-amplitude operating stability and micro movement performance.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a boom luffing hydraulic system and a crane. Background technique [0002] In the boom luffing operation of construction machinery, such as in truck cranes, the actuator is usually a luffing cylinder. In the boom drop operation, the boom lowering generally adopts hydraulic closed-loop control, that is, the balance of the large chamber installation of the luffing cylinder The valve opens and the oil source comes from the small cavity. However, in practical applications, it will be found that due to different loads and different angles of the boom, problems such as violent shaking of the boom and poor fretting often occur during the lowering of the boom. The reason is that the opening oil source of the balance valve comes from the small cavity. During the lowering process, the output flow of the main pump goes to the small cavity of the luffing cylinder and the pilot cavity of...

Claims

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Application Information

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IPC IPC(8): B66C23/82B66C13/20F15B13/02
CPCB66C13/20B66C23/82F15B11/08F15B2211/205F15B2211/505
Inventor 齐芳朱安宁
Owner ZHEJIANG SANY EQUIP
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