Jib luffing hydraulic system and crane
A hydraulic system and boom technology, which is applied in the field of engineering equipment, can solve problems such as the unsteady drop of the boom, and achieve the effect of improving the unsteady fall
Active Publication Date: 2021-02-09
XUZHOU HEAVY MASCH CO LTD
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
[0014] The present invention aims to provide a crane to improve the problem in the prior art that the boom is not falling smoothly due to the influence of the opening of the balance valve by the pressure of the rod cavity of the hydraulic cylinder
Method used
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[0040] 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. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. 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.
[0041] figure 2 A schematic structural view of the hydraulic system of the crane of the present embodiment is shown, as figure 2 As shown, the crane in this embodiment includes a frame, a boom mounted on the frame that can pitch and swing, and a boom luffing hydraulic system for driving the boom t...
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The invention relates to a boom luffing hydraulic system and a crane. The luffing hydraulic system includes: a hydraulic cylinder for driving the boom to pitch and swing, and the hydraulic cylinder includes a first chamber for discharging hydraulic fluid when the boom is falling and a second chamber for introducing hydraulic fluid; a control valve, including an inlet for introducing hydraulic fluid, a return port for discharging hydraulic fluid, a first fluid port and a second fluid port, the control valve has an inlet and a first fluid port The first state of the conduction and the second state of the inlet and the second fluid port are connected; the balance valve is connected between the first fluid port of the control valve and the first cavity of the hydraulic cylinder, and has a function for introducing a control balance The control fluid port of the hydraulic fluid of the opening degree of the valve, the control fluid port communicates with the second fluid port of the control valve; A first spool for switching the control valve between a first state and a second state, and a pressure reducing valve.
Description
technical field [0001] The invention relates to the field of engineering equipment, in particular to a boom luffing hydraulic system and a crane. Background technique [0002] figure 1 A hydraulic system of a related art crane is shown. The hydraulic system includes a hydraulic pump 1', a multi-way valve 2' communicated with the hydraulic pump 1', a hydraulic cylinder 5' used to drive the boom of the crane to pitch and swing relative to the vehicle frame. Wherein the multi-way valve 2' is a mechanically operated proportional valve. [0003] The multi-way valve 2' includes an inlet P connected with the hydraulic pump 1', a return port T connected with the hydraulic fluid tank, a first working port A connected with the rodless chamber of the hydraulic cylinder 5', and an active port connected with the hydraulic cylinder 5'. The second working port B connected to the rod cavity. The hydraulic system also includes a back pressure valve 3' connected on the flow path between t...
Claims
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IPC IPC(8): B66C23/82F15B11/08F15B13/04
CPCB66C23/828F15B11/08F15B13/04F15B2211/205F15B2211/505
Inventor 焦国旺李超杜建西朱双双
Owner XUZHOU HEAVY MASCH CO LTD