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Heavy long rod hoisting mechanism hydraulic system and control method

A lifting mechanism and hydraulic system technology, which is applied in the field of heavy-duty long-rod lifting mechanisms, can solve problems such as inability to completely offset the unbalanced moment of the system, difficult precise positioning of large load mechanisms, and prominent nonlinear features, etc., to achieve lightweight requirements , Improve the overall performance and simplify the mechanical structure

Inactive Publication Date: 2015-08-26
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the accumulator is not completely suitable for larger load mechanisms, and cannot completely offset the unbalanced moment of the system
The current hydraulic system lifting technology generally uses single-acting piston cylinders. However, this method is difficult to accurately position large load mechanisms, and it is easy to cause instability of the servo system due to prominent nonlinear characteristics.

Method used

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  • Heavy long rod hoisting mechanism hydraulic system and control method
  • Heavy long rod hoisting mechanism hydraulic system and control method

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Embodiment Construction

[0015] combine figure 1 , a hydraulic system of a heavy-duty long-rod lifting mechanism of the present invention, including a double quantitative vane pump 1, a first straight-through check valve 2, a first flip-chip oil filter 3, a pilot overflow valve 4, Superimposed pressure compensator 6, proportional servo valve 7, two-way hydraulic lock 8, double speed control valve 9, second straight-through check valve 10, second flip-chip oil filter 11, direct-acting overflow valve 12, Proportional pressure reducing valve 14, three-position four-way O-type median function electromagnetic reversing valve 16, superimposed one-way throttle valve 17, oil tank 21, three-chamber power hydraulic cylinder 18, heavy-duty long rod mechanism 19;

[0016] The double quantitative vane pump 1 includes a large pump 1-1 and a small pump 1-2, wherein the large pump 1-1 is connected to the first flip-chip oil filter 3 through the first straight-through check valve 2, and the The extracted hydraulic oi...

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Abstract

The invention discloses a heavy long rod hoisting mechanism hydraulic system. The hydraulic system is provided with a double-linkage fixed displacement vane pump set used for supplying oil and comprises a speed control loop and a position control loop. The speed control loop is connected with an upper cavity and a lower cavity of a three-cavity hydraulic cylinder through a large pump of the double-linkage fixed displacement vane pump set, the large pump is connected with a check valve and an oil sucking filter, and the oil sucking filter is connected with a pilot overflow valve and a proportional servo valve. Non-balanced disturbance can be effectively inhibited in the hoisting process of a heavy long rod, stability of a servo system is guaranteed, and accurate balance control and positioning control are achieved.

Description

technical field [0001] The invention discloses a heavy-duty long-rod lifting mechanism, in particular to a hydraulic system and a control method of the heavy-duty long-rod lifting mechanism. Background technique [0002] When the heavy-duty long rod mechanism is working in the vertical plane for reciprocating hoisting and turning, it is required to quickly and accurately locate to any angle within the working range according to the command. For the lifting method of similar mechanisms, the hydraulic servo system is generally used, which has the advantages of fast response, strong anti-interference ability, good low-speed stability, and easy overload protection. The lifting method of heavy long poles first considers balancing the unbalanced moment of the system. The balancing method can be divided into the method of applying external balancing force and the method of relying on the driving source. The methods of applying external balancing force are mainly counterweight bala...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B11/00B66C23/62
CPCB66C23/62F15B11/00
Inventor 高强李康金理侯远龙王超孙浩王力侯润民陈机林朱贺
Owner NANJING UNIV OF SCI & TECH
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