Dead weight drop amplitude compensating hydraulic system, crane and control system thereof

A technology of hydraulic system and self-weight fall, which is applied in the direction of mechanical equipment, fluid pressure actuators, load suspension components, etc., and can solve the problems that heavy objects cannot fall at a uniform speed

Inactive Publication Date: 2012-08-01
SANY AUTOMOBILE HOISTING MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the change of the boom angle, this control method cannot realize the uniform falling of the weight in the vertical direction.

Method used

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  • Dead weight drop amplitude compensating hydraulic system, crane and control system thereof
  • Dead weight drop amplitude compensating hydraulic system, crane and control system thereof
  • Dead weight drop amplitude compensating hydraulic system, crane and control system thereof

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Embodiment Construction

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0018] Examples of hydraulic systems:

[0019] see Figure 1-Figure 2 , shows an embodiment of the self-weight drop compensation hydraulic system. As shown in the figure, the embodiment of the present invention includes an oil circuit part and an electric control part.

[0020] Wherein, the oil passage part includes the luffing oil cylinder 2 , the first oil tank 10 and the electric proportional luffing balance valve 3 . Wherein the rod chamber 21 of the luffing...

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PUM

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Abstract

The invention provides a dead weight drop amplitude compensating hydraulic system, a crane and a control system thereof. The hydraulic system comprises a variable amplitude oil cylinder, an oil tank, an electric proportional variable amplitude balancing valve, an electronic control handle and a controller. The variable amplitude oil cylinder comprises a rod cavity and a rodless cavity; the electric proportional variable amplitude balancing valve comprises a working hydraulic fluid port and a control port; the rod cavity is communicated with the oil tank; and the rodless cavity is communicated with the working hydraulic fluid port. A pressure detecting unit is used for detecting the pressure of the rodless cavity, and an angle detecting unit is used for detecting the pitching angle of an elevator boom. The controller is connected with the control end of the electric control handle and the control end of the electric proportional variable amplitude balancing valve and outputs control current to the electric proportional variable amplitude balancing valve, and the control current is determined according to the opening of the electric control handle, the pressure of the rodless cavity and the pitching angle of the elevator boom. No pressure exists in the rod cavity of the variable amplitude oil cylinder, weights depend on dead weight to drop, the drop speed is only relevant to the input current of the electric proportional variable amplitude balancing valve, and the controller adjusts the input current of the electric proportional variable amplitude balancing valve in time, so that the weights drop at a uniform speed in the vertical direction.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a self-weight drop compensation hydraulic system, a crane and a control method thereof. Background technique [0002] The drop performance of the crane is an important index to measure the handling performance of the truck crane. At present, the crane adjusts the falling amplitude through the luffing cylinder. The luffing cylinder includes a rod chamber and a rodless chamber, and both the rod chamber and the rodless chamber are pressure chambers. An electric proportional balance valve is connected to the luffing oil cylinder, and the amplitude of falling is controlled by adjusting the opening of the electric proportional balance valve. However, with the change of the boom angle, this control method cannot realize the uniform falling of the weight in the vertical direction. Contents of the invention [0003] The invention proposes a self-weight fall compensation hydraulic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B66C13/20F15B11/02
Inventor 程度旺禹阳华周济新
Owner SANY AUTOMOBILE HOISTING MACHINERY
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