Luffing hydraulic system of boom and crane
A hydraulic system and boom technology, applied in the field of engineering equipment, can solve problems such as the unstable falling of the boom, and achieve the effect of improving the uneven falling.
Active Publication Date: 2019-11-08
XUZHOU HEAVY MASCH CO LTD
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[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...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a luffing hydraulic system of a boom and a crane. The luffing hydraulic system comprises a hydraulic cylinder, a control valve and a balance valve, wherein the hydraulic cylinder is used for driving the boom to luff and comprises a first cavity and a second cavity, and when the boom falls, hydraulic fluid is discharged out of the first cavity and then is guided into the second cavity; the control valve comprises an inlet used for guiding in the hydraulic fluid, a return port used for discharging the hydraulic fluid, a first fluid port and a second fluid port and has afirst state and a second state, an inlet of the control valve communicates with the first fluid port in the first state, and the inlet of the control valve communicates with the second fluid port in the second state; the balance valve is connected between the first fluid port of the control valve and the first cavity of the hydraulic cylinder and is provided with control fluid port used for guiding in the hydraulic fluid for controlling the opening degree of the control valve, and the control fluid port communicates with the second fluid port of the control valve; and the control valve furthercomprises a valve body, a first valve element and a pressure reduction valve, wherein the valve body is provided with the first valve cavity, and the first valve element is movably arranged in the first valve cavity to enable the control valve to be switched to the first state or the second state.
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More 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