CN103615440A - Oil cylinder core tube cavitation corrosion prevention system for crane and crane with same - Google Patents
Oil cylinder core tube cavitation corrosion prevention system for crane and crane with same Download PDFInfo
- Publication number
- CN103615440A CN103615440A CN201310667430.4A CN201310667430A CN103615440A CN 103615440 A CN103615440 A CN 103615440A CN 201310667430 A CN201310667430 A CN 201310667430A CN 103615440 A CN103615440 A CN 103615440A
- Authority
- CN
- China
- Prior art keywords
- port
- communicated
- actuator port
- oil cylinder
- actuator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention relates to an oil cylinder core tube cavitation corrosion prevention system for a crane and the crane with the oil cylinder core tube cavitation corrosion prevention system. The oil cylinder core tube cavitation corrosion prevention system for the crane comprises a telescopic changeover valve, a cavitation corrosion prevention overflow valve, a first directional control valve, a second directional control valve, a primary oil cylinder and a secondary oil cylinder, wherein the cavitation corrosion prevention overflow valve comprises a first oil port and a second oil port, the first directional control valve comprises a first control oil port, a second control oil port, four working oil port and two working positions, the second directional control valve comprises four working oil ports and two working positions, the primary oil cylinder comprises a core tube cavity, a rod cavity and a rodless cavity, and the secondary oil cylinder comprises a rod cavity and a rodless cavity. According to the oil cylinder core tube cavitation corrosion prevention system for the crane, due to the facts that a core tube oil supplementation channel is added, and the flow of supplemented oil is reasonably matched, the core tube cavity can be kept to be in the constant pressure state all the time, and the problem that cavitation corrosion of the core tube cavity happens due to the fact that negative pressure exists in a core tube is effectively solved; in addition, the phenomenon that extension of a third arm, a fourth arm and a fifth arm delays can be avoided, and a shaking fault of a pipeline can be prevented from happening.
Description
Technical field
The present invention relates to engineering machinery field, be specifically related to a kind of hoist with preventing the system of oil cylinder core pipe cavitation erosion and comprising the hoist that prevents the system of oil cylinder core pipe cavitation erosion for this hoist.
Background technique
On modern crane tool, for five joint arm rope row formula telescopic systems, be to use one-level oil cylinder, two-level oil cylinder to realize to stretch, the flexible of two joint arms is that the hydraulic oil one-level oil cylinder of flowing through drives, 345 joint arms are flexible is after switching by flexible switching valve, and the core pipe that hydraulic oil flows through one-level oil cylinder enters that two-level oil cylinder drives.The flexible order of five joint arm rope row formula telescopic systems is: while stretching, first stretch one-level oil cylinder Zai Shen two-level oil cylinder, the Suo Shixiansuo two-level oil cylinder oil cylinder of contracting one-level again.After having stretched one-level oil cylinder, cannot oil-feed due to the core tube chamber of one-level oil cylinder, cause the inner negative pressure that forms, serious even cause cavitation erosion.The core tube chamber that repeatedly feeds back one-level oil cylinder in debugging plant area and exterior market occurs that negative pressure, 345 joint arms occur postponing while stretching, the more serious core tube chamber that even occurs one-level oil cylinder cavitates, finally vehicle is caused damage, user's economic benefit incurs loss.Flexible switching valve is to obtain electric order by controlling solenoid valve, switches the flow direction of working connection, realizes the flexible switching of two joint arms and 345 joint arms.
Summary of the invention
The object of the invention is to propose a kind of hoist with preventing the system of oil cylinder core pipe cavitation erosion and comprising the hoist that prevents the system of oil cylinder core pipe cavitation erosion for this hoist, this hoist has solved the problems referred to above effectively by the system that prevents the cavitation erosion of oil cylinder core pipe, simple in structure, easy to operate.
For achieving the above object, the invention provides following technological scheme:
The system that prevents the cavitation erosion of oil cylinder core pipe for a kind of hoist, system comprises flexible switching valve, cavitation-preventive relief valve, first direction control valve, second direction control valve, one-level oil cylinder and two-level oil cylinder, flexible switching valve comprises pressure hydraulic fluid port and oil return hydraulic fluid port, pressure hydraulic fluid port is communicated with system pressure oil circuit, and oil return hydraulic fluid port is communicated with system oil return oil circuit; Cavitation-preventive relief valve comprises the first hydraulic fluid port and the second hydraulic fluid port, and its first hydraulic fluid port is communicated with the oil return hydraulic fluid port of flexible switching valve; First direction control valve comprises the first control port, the second control port, four actuator ports and two working positions, and its first actuator port is communicated with the pressure hydraulic fluid port of flexible switching valve, and the second actuator port is communicated with the second hydraulic fluid port of cavitation-preventive relief valve; And first direction control valve is configured to: in the first working position, its first actuator port is communicated with the 3rd actuator port, the second actuator port is communicated with the 4th actuator port; In the second working position, its first actuator port is communicated with the 4th actuator port, the second actuator port and the first actuator port, the 3rd actuator port, the 4th actuator port are non-conduction, the 3rd actuator port and the first actuator port, the second actuator port, the 4th actuator port are non-conduction; Second direction control valve comprises four actuator ports and two working positions, its first actuator port is communicated with the first control port of first direction control valve, the second actuator port is communicated with filler opening, the 3rd actuator port is communicated with the second control port of first direction control valve, and the 4th actuator port is communicated with oil outlet; And second direction control valve is configured to: in the first working position, its first actuator port is communicated with the second actuator port, the 3rd actuator port is communicated with the 4th actuator port; In the second working position, its first actuator port is communicated with the 4th actuator port, the second actuator port is communicated with the 3rd actuator port; One-level oil cylinder comprises core tube chamber, rod chamber and rodless cavity, and its core tube chamber is communicated with the 4th actuator port of first direction control valve, and rodless cavity is communicated with the 3rd actuator port of first direction control valve, and rod chamber is communicated with rod chamber turnover oil pipe line; Two-level oil cylinder comprises rod chamber and rodless cavity, and its rodless cavity is communicated with the core tube chamber of one-level oil cylinder, and rod chamber is communicated with the rod chamber of one-level oil cylinder.
The system that prevents the cavitation erosion of oil cylinder core pipe for a kind of hoist, system comprises flexible switching valve, direct-acting overflow valve, one-way valve, first direction control valve, second direction control valve, one-level oil cylinder and two-level oil cylinder, flexible switching valve comprises pressure hydraulic fluid port and oil return hydraulic fluid port, pressure hydraulic fluid port is communicated with system pressure oil circuit, and oil return hydraulic fluid port is communicated with system oil return oil circuit; Direct-acting overflow valve and one-way valve are arranged in parallel, and direct-acting overflow valve includes an inlet and an outlet, and one-way valve includes an inlet and an outlet, and the outlet of direct-acting overflow valve, the entrance of one-way valve are communicated with the oil return hydraulic fluid port of flexible switching valve; First direction control valve comprises the first control port, the second control port, four actuator ports and two working positions, its first actuator port is communicated with the pressure hydraulic fluid port of flexible switching valve, and the second actuator port is communicated with the entrance of direct-acting overflow valve, the outlet of one-way valve; And first direction control valve is configured to: in the first working position, its first actuator port is communicated with the 3rd actuator port, the second actuator port is communicated with the 4th actuator port; In the second working position, its first actuator port is communicated with the 4th actuator port, the second actuator port and the first actuator port, the 3rd actuator port, the 4th actuator port are non-conduction, the 3rd actuator port and the first actuator port, the second actuator port, the 4th actuator port are non-conduction; Second direction control valve comprises four actuator ports and two working positions, its first actuator port is communicated with the first control port of first direction control valve, the second actuator port is communicated with filler opening, the 3rd actuator port is communicated with the second control port of first direction control valve, and the 4th actuator port is communicated with oil outlet; And second direction control valve is configured to: in the first working position, its first actuator port is communicated with the second actuator port, the 3rd actuator port is communicated with the 4th actuator port; In the second working position, its first actuator port is communicated with the 4th actuator port, the second actuator port is communicated with the 3rd actuator port; One-level oil cylinder comprises core tube chamber, rod chamber and rodless cavity, and its core tube chamber is communicated with the 4th actuator port of first direction control valve, and rodless cavity is communicated with the 3rd actuator port of first direction control valve, and rod chamber is communicated with rod chamber turnover oil pipe line; Two-level oil cylinder comprises rod chamber and rodless cavity, and its rodless cavity is communicated with the core tube chamber of one-level oil cylinder, and rod chamber is communicated with the rod chamber of one-level oil cylinder.
At one preferably or alternatively in embodiment, system also comprises the first equilibrium valve, the first equilibrium valve comprises the first hydraulic fluid port, the second hydraulic fluid port and control port, its first hydraulic fluid port is communicated with the 3rd actuator port of first direction control valve, the second hydraulic fluid port is communicated with the rodless cavity of one-level oil cylinder, and control port is communicated with the rod chamber of one-level oil cylinder.
At one preferably or alternatively in embodiment, system also comprises the second equilibrium valve, the second equilibrium valve comprises the first hydraulic fluid port, the second hydraulic fluid port and control port, its first hydraulic fluid port is communicated with the core tube chamber of one-level oil cylinder, the second hydraulic fluid port is communicated with the rodless cavity of two-level oil cylinder, and control port is communicated with the rod chamber of two-level oil cylinder.
At one, preferably or alternatively in embodiment, first direction control valve is two-position four-way solenoid directional control valve.
At one, preferably or alternatively in embodiment, second direction control valve is two-position four-way solenoid directional control valve.
The present invention also provides following technological scheme:
A hoist, hoist comprises the system that prevents the cavitation erosion of oil cylinder core pipe for hoist as above.
At one, preferably or alternatively in embodiment, hoist is the hoist that comprises five joint arm ropes row formula telescopic systems.
Arbitrary technological scheme based in technique scheme, the embodiment of the present invention at least can produce following technique effect:
Due to the system that prevents the cavitation erosion of oil cylinder core pipe for hoist provided by the present invention, comprise flexible switching valve, cavitation-preventive relief valve, first direction control valve, second direction control valve, one-level oil cylinder, two-level oil cylinder or comprise flexible switching valve, direct-acting overflow valve, one-way valve, first direction control valve, second direction control valve, one-level oil cylinder, two-level oil cylinder, by increasing core pipe repairing passage, and Proper Match repairing flow, remain that core tube chamber is in pressure constant state, the core tube chamber cavitation erosion problem of effectively having avoided core pipe to occur negative pressure and having caused, the appearance that can avoid in addition 345 joint arms to stretch delay phenomenon and pipeline jitterbug.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the hydraulic principle schematic diagram that prevents the first embodiment of the system that oil cylinder core pipe cavitates for hoist of the present invention;
Fig. 2 is the hydraulic principle schematic diagram that prevents the second embodiment of the system that oil cylinder core pipe cavitates for hoist of the present invention.
Embodiment
Below by drawings and Examples, technological scheme of the present invention is described in further detail.
It should be noted that: any technical characteristics in the present embodiment, any technological scheme is all the technical characteristics of plurality of optional or one or more in optional technological scheme, cannot exhaustive all alternative technical characteristicss of the present invention and alternative technological scheme in order to describe succinct need in presents, also the mode of execution that is not easy to each technical characteristics all emphasizes that it is one of optional numerous embodiments, so those skilled in the art should know: any technical characteristics and any technological scheme in the present embodiment all do not limit the scope of the invention, protection scope of the present invention should comprise that those skilled in the art do not pay the thinkable any alternate embodiments of creative work.
Below in order to narrate conveniently, hereinafter alleged " left side ", " right side ", " on ", left and right, the upper and lower of D score and accompanying drawing itself is to consistent.
As shown in Figure 1, the system that prevents the cavitation erosion of oil cylinder core pipe for a kind of hoist, system comprises flexible switching valve (not shown), cavitation-preventive relief valve 1, first direction control valve 2, second direction control valve 8, one-level oil cylinder 5 and two-level oil cylinder 7, flexible switching valve comprises pressure hydraulic fluid port P and oil return hydraulic fluid port T, pressure hydraulic fluid port P is communicated with system pressure oil circuit, and oil return hydraulic fluid port T is communicated with system oil return oil circuit; Cavitation-preventive relief valve 1 comprises the first hydraulic fluid port 11 and the second hydraulic fluid port 12, and its first hydraulic fluid port 11 is communicated with the oil return hydraulic fluid port T of flexible switching valve; First direction control valve 2 comprises the first control port 25, the second control port 26, four actuator ports and two working positions, its first actuator port 23 is communicated with the pressure hydraulic fluid port P of flexible switching valve, and the second actuator port 24 is communicated with the second hydraulic fluid port 12 of cavitation-preventive relief valve 1; And first direction control valve 2 is configured to: (illustrate left position) in the first working position, its first actuator port 23 is communicated with the 3rd actuator port 21, the second actuator port 24 is communicated with the 4th actuator port 22; In the second working position (illustrate right position), its first actuator port 23 is communicated with the 4th actuator port 22, the second actuator port 24 and the first actuator port 23, the 3rd actuator port 21, the 4th actuator port 22 are non-conduction, the 3rd actuator port 21 and the first actuator port 23, the second actuator port 24, the 4th actuator port 22 are non-conduction; Second direction control valve 8 comprises four actuator ports and two working positions, its first actuator port 81 is communicated with the first control port 25 of first direction control valve 2, the second actuator port 82 is communicated with filler opening X, the 3rd actuator port 83 is communicated with the second control port 26 of first direction control valve 2, and the 4th actuator port 84 is communicated with oil outlet Y; And second direction control valve 8 is configured to: (illustrate the next) in the first working position, its first actuator port 81 is communicated with the second actuator port 82, the 3rd actuator port 83 is communicated with the 4th actuator port 84; In the second working position, (illustrate upper), its first actuator port 81 is communicated with the 4th actuator port 84, the second actuator port 82 is communicated with the 3rd actuator port 83; One-level oil cylinder 5 comprises core tube chamber 4, rod chamber and rodless cavity, its core tube chamber 4 is communicated with the 4th actuator port 22 of first direction control valve 2, rodless cavity is communicated with the 3rd actuator port 21 of first direction control valve 2, and rod chamber is communicated with rod chamber turnover oil pipe line 13; Two-level oil cylinder 7 comprises rod chamber and rodless cavity, and its rodless cavity is communicated with the core tube chamber 4 of one-level oil cylinder 5, and rod chamber is communicated with the rod chamber of one-level oil cylinder 5.
The working method of cavitation-preventive relief valve is: when the T mouth of flexible switching valve is used for oil return, by the oil return of cavitation-preventive relief valve; When the T mouth of flexible switching valve is not used in oil return, by the oil suction of cavitation-preventive relief valve.
The rodless cavity of two-level oil cylinder is communicated with the core tube chamber of one-level oil cylinder, and the core tube chamber of one-level oil cylinder is to the rodless cavity fuel feeding of two-level oil cylinder.
Flexible switching valve can be with reference to prior art, and the present invention no longer launches to describe.
Rod chamber turnover oil pipe line is to rod chamber oil-feed and the oil return of the rod chamber oil-feed of one-level oil cylinder and oil return, two-level oil cylinder, the rod chamber of one-level oil cylinder and the rod chamber of two-level oil cylinder are communicated with, for example, when one-level oil cylinder is stretched, the rod chamber of one-level oil cylinder passes in and out oil pipe line oil return by rod chamber; During the contracting of one-level oil cylinder, the rod chamber of one-level oil cylinder passes in and out oil pipe line oil-feed by rod chamber; The rod chamber of Shen Shi, two-level oil cylinder of two-level oil cylinder is by rod chamber and the oil return of rod chamber turnover oil pipe line of one-level oil cylinder; Rod chamber and the rod chamber turnover oil pipe line oil-feed of the rod chamber of Suo Shi, two-level oil cylinder of two-level oil cylinder by one-level oil cylinder, rod chamber turnover oil pipe line switch oil-feed and fuel-displaced can be with reference to prior art, the present invention no longer launches to describe.
System also comprises the first equilibrium valve 3, the first equilibrium valve 3 comprises the first hydraulic fluid port 31, the second hydraulic fluid port 32 and control port 33, its first hydraulic fluid port 31 is communicated with the 3rd actuator port 21 of first direction control valve 2, the second hydraulic fluid port 32 is communicated with the rodless cavity of one-level oil cylinder 5, and control port 33 is communicated with the rod chamber of one-level oil cylinder 4.
System also comprises the second equilibrium valve 6, the second equilibrium valve 6 comprises the first hydraulic fluid port 61, the second hydraulic fluid port 62 and control port 63, its first hydraulic fluid port 61 is communicated with the core tube chamber 4 of one-level oil cylinder 5, and the rodless cavity of the second hydraulic fluid port 62Yu two-level oil cylinder 7 is communicated with, and the rod chamber of control port 63Yu two-level oil cylinder 7 is communicated with.
First direction control valve 2 is two-position four-way solenoid directional control valve.
Second direction control valve 8 is two-position four-way solenoid directional control valve.
Hoist is realized the automatic repairing of one-level oil cylinder core tube chamber by the system that prevents the cavitation erosion of oil cylinder core pipe by cavitation-preventive relief valve, and its working principle is as follows:
When stretching one-level oil cylinder 5, second direction control valve 8 must not be electric, in the first working position, (illustrate the next), oil enters from X mouth, pass through successively the second actuator port 82 of second direction control valve 8, the first actuator port 81, arrive the first control port 25 of first direction control valve 2, pass through again the second control port 26 of first direction control valve 2, the 3rd actuator port 83 of second direction control valve 8, the 4th actuator port 84, from Y mouth, flow out, at this moment first direction control valve 2 (illustrates left position) in the first working position, oil enters from P mouth, pass through successively the first actuator port 23 of first direction control valve 2, the 3rd actuator port 21, A mouth, the first hydraulic fluid port 31 of the first equilibrium valve 3, the second hydraulic fluid port 32 arrives the rodless cavity of one-level oil cylinder 5, the oil of the rod chamber of one-level oil cylinder 5 is discharged through rod chamber turnover oil pipe line 13, when the T mouth of flexible switching valve is not used in oil return, hydraulic oil passes through cavitation-preventive relief valve 1 from the T mouth of flexible switching valve, through B mouth, enter again the core tube chamber 4 of one-level oil cylinder 5, automatically realized the repairing of core pipe, make core tube chamber keep a constant voltage, prevented generation negative pressure appearance in core pipe, stopped core pipe the possibility cavitating has occurred, during Zai Shen two-level oil cylinder 7, second direction control valve 8 obtains electric, in the second working position, (illustrate upper), oil enters from X mouth, pass through successively the second actuator port 82 of second direction control valve 8, the 3rd actuator port 83, arrive the second control port 26 of first direction control valve 2, pass through again the first control port 25 of first direction control valve 2, the first actuator port 81 of second direction control valve 8, the 4th actuator port 84, from Y mouth, flow out, at this moment first direction control valve 2 (illustrates right position) in the second working position, hydraulic oil enters from the P mouth of flexible switching valve, pass through successively the first actuator port 23 of first direction control valve 2, the 4th actuator port 22, pass through again B mouth to the core tube chamber 4 of one-level oil cylinder 5, the rodless cavity that arrives two-level oil cylinder 7 promotes two-level oil cylinder's 7 realizations and stretches action, the oil of the rod chamber of two-level oil cylinder 7 is discharged through rod chamber and the rod chamber turnover oil pipe line 13 of one-level oil cylinder 5, core tube chamber 4 maintenance constant voltages due to previous one-level oil cylinder 5, avoid the appearance of the delay of Liao Shen two-level oil cylinder and pipeline jitterbug.
A hoist, hoist comprises the system that prevents the cavitation erosion of oil cylinder core pipe for hoist as above.
Hoist is the hoist that comprises five joint arm rope row formula telescopic systems.
The other parts of hoist can be with reference to prior art, and the present invention no longer launches to describe.
As shown in Figure 2, the system that prevents the cavitation erosion of oil cylinder core pipe for a kind of hoist, system comprises flexible switching valve (not shown), direct-acting overflow valve 10, one-way valve 9, first direction control valve 2, second direction control valve 8, one-level oil cylinder 5 and two-level oil cylinder 7, flexible switching valve comprises pressure hydraulic fluid port P and oil return hydraulic fluid port T, pressure hydraulic fluid port P is communicated with system pressure oil circuit, and oil return hydraulic fluid port T is communicated with system oil return oil circuit; Direct-acting overflow valve 10 and one-way valve 9 are arranged in parallel, direct-acting overflow valve 10 comprises entrance 102 and outlet 101, one-way valve 9 comprises entrance 91 and outlet 92, and the outlet 101 of direct-acting overflow valve 10, the entrance 91 of one-way valve 9 are communicated with the oil return hydraulic fluid port T of flexible switching valve; First direction control valve 2 comprises the first control port 25, the second control port 26, four actuator ports and two working positions, its first actuator port 23 is communicated with the pressure hydraulic fluid port P of flexible switching valve, and the second actuator port 24 is communicated with the entrance 102 of direct-acting overflow valve 10, the outlet 92 of one-way valve 9; And first direction control valve 2 is configured to: (illustrate left position) in the first working position, its first actuator port 23 is communicated with the 3rd actuator port 21, the second actuator port 24 is communicated with the 4th actuator port 22; In the second working position (illustrate right position), its first actuator port 23 is communicated with the 4th actuator port 22, the second actuator port 24 and the first actuator port 23, the 3rd actuator port 21, the 4th actuator port 22 are non-conduction, the 3rd actuator port 21 and the first actuator port 23, the second actuator port 24, the 4th actuator port 22 are non-conduction; Second direction control valve 8 comprises four actuator ports and two working positions, its first actuator port 81 is communicated with the first control port 25 of first direction control valve 2, the second actuator port 82 is communicated with filler opening X, the 3rd actuator port 83 is communicated with the second control port 26 of first direction control valve 2, and the 4th actuator port 84 is communicated with oil outlet Y; And second direction control valve 8 is configured to: (illustrate the next) in the first working position, its first actuator port 81 is communicated with the second actuator port 82, the 3rd actuator port 83 is communicated with the 4th actuator port 84; In the second working position, (illustrate upper), its first actuator port 81 is communicated with the 4th actuator port 84, the second actuator port 82 is communicated with the 3rd actuator port 83; One-level oil cylinder 5 comprises core tube chamber 4, rod chamber and rodless cavity, its core tube chamber 4 is communicated with the 4th actuator port 22 of first direction control valve 2, rodless cavity is communicated with the 3rd actuator port 21 of first direction control valve 2, and rod chamber is communicated with rod chamber turnover oil pipe line 13; Two-level oil cylinder 7 comprises rod chamber and rodless cavity, and its rodless cavity is communicated with the core tube chamber 4 of one-level oil cylinder 5, and rod chamber is communicated with the rod chamber of one-level oil cylinder 5.
The working method that direct-acting overflow valve and one-way valve are arranged in parallel is: when the T mouth of flexible switching valve is used for oil return, by direct-acting overflow valve oil return; When the T mouth of flexible switching valve is not used in oil return, by one-way valve oil suction.
The rodless cavity of two-level oil cylinder is communicated with the core tube chamber of one-level oil cylinder, and the core tube chamber of one-level oil cylinder is to the rodless cavity fuel feeding of two-level oil cylinder.
Flexible switching valve can be with reference to prior art, and the present invention no longer launches to describe.
Rod chamber turnover oil pipe line is to rod chamber oil-feed and the oil return of the rod chamber oil-feed of one-level oil cylinder and oil return, two-level oil cylinder, the rod chamber of one-level oil cylinder and the rod chamber of two-level oil cylinder are communicated with, for example, when one-level oil cylinder is stretched, the rod chamber of one-level oil cylinder passes in and out oil pipe line oil return by rod chamber; During the contracting of one-level oil cylinder, the rod chamber of one-level oil cylinder passes in and out oil pipe line oil-feed by rod chamber; The rod chamber of Shen Shi, two-level oil cylinder of two-level oil cylinder is by rod chamber and the oil return of rod chamber turnover oil pipe line of one-level oil cylinder; Rod chamber and the rod chamber turnover oil pipe line oil-feed of the rod chamber of Suo Shi, two-level oil cylinder of two-level oil cylinder by one-level oil cylinder, rod chamber turnover oil pipe line switch oil-feed and fuel-displaced can be with reference to prior art, the present invention no longer launches to describe.
System also comprises the first equilibrium valve 3, the first equilibrium valve 3 comprises the first hydraulic fluid port 31, the second hydraulic fluid port 32 and control port 33, its first hydraulic fluid port 31 is communicated with the 3rd actuator port 21 of first direction control valve 2, the second hydraulic fluid port 32 is communicated with the rodless cavity of one-level oil cylinder 5, and control port 33 is communicated with the rod chamber of one-level oil cylinder 5.
System also comprises the second equilibrium valve 6, the second equilibrium valve 6 comprises the first hydraulic fluid port 61, the second hydraulic fluid port 62 and control port 63, its first hydraulic fluid port 61 is communicated with the core tube chamber 4 of one-level oil cylinder 5, and the rodless cavity of the second hydraulic fluid port 62Yu two-level oil cylinder 7 is communicated with, and the rod chamber of control port 63Yu two-level oil cylinder 7 is communicated with.
First direction control valve 2 is two-position four-way solenoid directional control valve.
Second direction control valve 8 is two-position four-way solenoid directional control valve.
Hoist is realized the automatic repairing of one-level oil cylinder core tube chamber by the system that prevents the cavitation erosion of oil cylinder core pipe by direct-acting overflow valve, one-way valve, and its working principle is as follows:
When stretching one-level oil cylinder 5, second direction control valve 8 must not be electric, in the first working position, (illustrate the next), oil enters from X mouth, pass through successively the second actuator port 82 of second direction control valve 8, the first actuator port 81, arrive the first control port 25 of first direction control valve 2, pass through again the second control port 26 of first direction control valve 2, the 3rd actuator port 83 of second direction control valve 8, the 4th actuator port 84, from Y mouth, flow out, at this moment first direction control valve 2 (illustrates left position) in the first working position, oil enters from P mouth, pass through successively the first actuator port 23 of first direction control valve 2, the 3rd actuator port 21, A mouth, the first hydraulic fluid port 31 of the first equilibrium valve 3, the second hydraulic fluid port 32 arrives the rodless cavity of one-level oil cylinder 5, the oil of the rod chamber of one-level oil cylinder 5 is discharged through rod chamber turnover oil pipe line 13, when the T mouth of flexible switching valve is not used in oil return, hydraulic oil passes through one-way valve 9 from the T mouth of flexible switching valve, through B mouth, enter again the core tube chamber 4 of one-level oil cylinder 5, automatically realized the repairing of core pipe, make core tube chamber keep a constant voltage, prevented generation negative pressure appearance in core pipe, stopped core pipe the possibility cavitating has occurred, during Zai Shen two-level oil cylinder 7, second direction control valve 8 obtains electric, in the second working position, (illustrate upper), oil enters from X mouth, pass through successively the second actuator port 82 of second direction control valve 8, the 3rd actuator port 83, arrive the second control port 26 of first direction control valve 2, pass through again the first control port 25 of first direction control valve 2, the first actuator port 81 of second direction control valve 8, the 4th actuator port 84, from Y mouth, flow out, at this moment first direction control valve 2 (illustrates right position) in the second working position, hydraulic oil enters from the P mouth of flexible switching valve, pass through successively the first actuator port 23 of first direction control valve 2, the 4th actuator port 22, pass through again B mouth to the core tube chamber 4 of one-level oil cylinder 5, the rodless cavity that arrives two-level oil cylinder 7 promotes two-level oil cylinder's 7 realizations and stretches action, the oil of the rod chamber of two-level oil cylinder 7 is discharged through rod chamber and the rod chamber turnover oil pipe line 13 of one-level oil cylinder 5, core tube chamber maintenance constant voltage due to previous one-level oil cylinder, avoid the appearance of the delay of Liao Shen two-level oil cylinder and pipeline jitterbug.
A hoist, hoist comprises the system that prevents the cavitation erosion of oil cylinder core pipe for hoist as above.
Hoist is the hoist that comprises five joint arm rope row formula telescopic systems.
The other parts of hoist can be with reference to prior art, and the present invention no longer launches to describe.
The disclosed arbitrary technological scheme of the invention described above unless otherwise stated, if it discloses number range, so disclosed number range is preferred number range, any it should be appreciated by those skilled in the art: preferred number range is only the obvious or representative numerical value of technique effect in many enforceable numerical value.Because numerical value is more, cannot be exhaustive, so the present invention just discloses part numerical value to illustrate technological scheme of the present invention, and the above-mentioned numerical value of enumerating should not form the restriction to the invention protection domain.
Simultaneously, if the invention described above discloses or has related to component or the structural member of connection fastened to each other, so, unless otherwise stated, be fixedly connected with and can be understood as: can dismantle and be fixedly connected with (for example using bolt or screw to connect), also can be understood as: non-removable being fixedly connected with (for example rivet, weld), certainly, connection fastened to each other also can for example, be replaced (obviously cannot adopt except integrally formed technique) by integral type structure (use casting technique is integrally formed to be created).
In addition, in the disclosed arbitrary technological scheme of the invention described above applied for the term that represents position relationship or shape unless otherwise stated its implication comprise and its approximate, similar or approaching state or shape.Arbitrary parts provided by the invention can be both to be assembled by a plurality of independent constituent elements, the produced separate part of the technique that also can be one of the forming.
Finally should be noted that: above embodiment is only in order to illustrate that technological scheme of the present invention is not intended to limit; Although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the field are to be understood that: still can modify or part technical characteristics is equal to replacement the specific embodiment of the present invention; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technological scheme scope that the present invention asks for protection.
Claims (8)
1. a hoist use prevents the system that oil cylinder core pipe cavitates, it is characterized in that: described system comprises flexible switching valve, cavitation-preventive relief valve, first direction control valve, second direction control valve, one-level oil cylinder and two-level oil cylinder, flexible switching valve comprises pressure hydraulic fluid port and oil return hydraulic fluid port, pressure hydraulic fluid port is communicated with system pressure oil circuit, and oil return hydraulic fluid port is communicated with system oil return oil circuit;
Cavitation-preventive relief valve comprises the first hydraulic fluid port and the second hydraulic fluid port, and its first hydraulic fluid port is communicated with the oil return hydraulic fluid port of flexible switching valve;
First direction control valve comprises the first control port, the second control port, four actuator ports and two working positions, and its first actuator port is communicated with the pressure hydraulic fluid port of flexible switching valve, and the second actuator port is communicated with the second hydraulic fluid port of cavitation-preventive relief valve; And first direction control valve is configured to: in the first working position, its first actuator port is communicated with the 3rd actuator port, the second actuator port is communicated with the 4th actuator port; In the second working position, its first actuator port is communicated with the 4th actuator port, the second actuator port and the first actuator port, the 3rd actuator port, the 4th actuator port are non-conduction, the 3rd actuator port and the first actuator port, the second actuator port, the 4th actuator port are non-conduction;
Second direction control valve comprises four actuator ports and two working positions, its first actuator port is communicated with the first control port of first direction control valve, the second actuator port is communicated with filler opening, the 3rd actuator port is communicated with the second control port of first direction control valve, and the 4th actuator port is communicated with oil outlet; And second direction control valve is configured to: in the first working position, its first actuator port is communicated with the second actuator port, the 3rd actuator port is communicated with the 4th actuator port; In the second working position, its first actuator port is communicated with the 4th actuator port, the second actuator port is communicated with the 3rd actuator port;
One-level oil cylinder comprises core tube chamber, rod chamber and rodless cavity, and its core tube chamber is communicated with the 4th actuator port of first direction control valve, and rodless cavity is communicated with the 3rd actuator port of first direction control valve, and rod chamber is communicated with rod chamber turnover oil pipe line;
Two-level oil cylinder comprises rod chamber and rodless cavity, and its rodless cavity is communicated with the core tube chamber of one-level oil cylinder, and rod chamber is communicated with the rod chamber of one-level oil cylinder.
2. a hoist use prevents the system that oil cylinder core pipe cavitates, it is characterized in that: described system comprises flexible switching valve, direct-acting overflow valve, one-way valve, first direction control valve, second direction control valve, one-level oil cylinder and two-level oil cylinder, flexible switching valve comprises pressure hydraulic fluid port and oil return hydraulic fluid port, pressure hydraulic fluid port is communicated with system pressure oil circuit, and oil return hydraulic fluid port is communicated with system oil return oil circuit;
Direct-acting overflow valve and one-way valve are arranged in parallel, and direct-acting overflow valve includes an inlet and an outlet, and one-way valve includes an inlet and an outlet, and the outlet of direct-acting overflow valve, the entrance of one-way valve are communicated with the oil return hydraulic fluid port of flexible switching valve;
First direction control valve comprises the first control port, the second control port, four actuator ports and two working positions, its first actuator port is communicated with the pressure hydraulic fluid port of flexible switching valve, and the second actuator port is communicated with the entrance of direct-acting overflow valve, the outlet of one-way valve; And first direction control valve is configured to: in the first working position, its first actuator port is communicated with the 3rd actuator port, the second actuator port is communicated with the 4th actuator port; In the second working position, its first actuator port is communicated with the 4th actuator port, the second actuator port and the first actuator port, the 3rd actuator port, the 4th actuator port are non-conduction, the 3rd actuator port and the first actuator port, the second actuator port, the 4th actuator port are non-conduction;
Second direction control valve comprises four actuator ports and two working positions, its first actuator port is communicated with the first control port of first direction control valve, the second actuator port is communicated with filler opening, the 3rd actuator port is communicated with the second control port of first direction control valve, and the 4th actuator port is communicated with oil outlet; And second direction control valve is configured to: in the first working position, its first actuator port is communicated with the second actuator port, the 3rd actuator port is communicated with the 4th actuator port; In the second working position, its first actuator port is communicated with the 4th actuator port, the second actuator port is communicated with the 3rd actuator port;
One-level oil cylinder comprises core tube chamber, rod chamber and rodless cavity, and its core tube chamber is communicated with the 4th actuator port of first direction control valve, and rodless cavity is communicated with the 3rd actuator port of first direction control valve, and rod chamber is communicated with rod chamber turnover oil pipe line;
Two-level oil cylinder comprises rod chamber and rodless cavity, and its rodless cavity is communicated with the core tube chamber of one-level oil cylinder, and rod chamber is communicated with the rod chamber of one-level oil cylinder.
3. system according to claim 1 and 2, it is characterized in that: described system also comprises the first equilibrium valve, described the first equilibrium valve comprises the first hydraulic fluid port, the second hydraulic fluid port and control port, its first hydraulic fluid port is communicated with the 3rd actuator port of first direction control valve, the second hydraulic fluid port is communicated with the rodless cavity of one-level oil cylinder, and control port is communicated with the rod chamber of one-level oil cylinder.
4. system according to claim 1 and 2, it is characterized in that: described system also comprises the second equilibrium valve, described the second equilibrium valve comprises the first hydraulic fluid port, the second hydraulic fluid port and control port, its first hydraulic fluid port is communicated with the core tube chamber of one-level oil cylinder, the second hydraulic fluid port is communicated with the rodless cavity of two-level oil cylinder, and control port is communicated with the rod chamber of two-level oil cylinder.
5. system according to claim 1 and 2, is characterized in that: described first direction control valve is two-position four-way solenoid directional control valve.
6. system according to claim 1 and 2, is characterized in that: described second direction control valve is two-position four-way solenoid directional control valve.
7. a hoist, is characterized in that: described hoist comprises the system that prevents the cavitation erosion of oil cylinder core pipe for hoist described in claim 1-6 any one.
8. hoist according to claim 7, is characterized in that: described hoist is the hoist that comprises five joint arm rope row formula telescopic systems.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310667430.4A CN103615440B (en) | 2013-12-10 | 2013-12-10 | A kind of hoist system preventing oil cylinder core tube from cavitating and hoist thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310667430.4A CN103615440B (en) | 2013-12-10 | 2013-12-10 | A kind of hoist system preventing oil cylinder core tube from cavitating and hoist thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103615440A true CN103615440A (en) | 2014-03-05 |
| CN103615440B CN103615440B (en) | 2016-04-27 |
Family
ID=50166154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310667430.4A Active CN103615440B (en) | 2013-12-10 | 2013-12-10 | A kind of hoist system preventing oil cylinder core tube from cavitating and hoist thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103615440B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104879337A (en) * | 2015-04-22 | 2015-09-02 | 北汽福田汽车股份有限公司 | Oil cylinder switching valve and hydraulic system comprising same and engineering machinery |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040084499A (en) * | 2003-03-28 | 2004-10-06 | 학교법인 울산공업학원 | hydraulic circuit of active load simulator |
| US6959726B2 (en) * | 2003-10-01 | 2005-11-01 | Husco International, Inc. | Valve assembly for attenuating bounce of hydraulically driven members of a machine |
| CN201428657Y (en) * | 2009-03-30 | 2010-03-24 | 徐州重型机械有限公司 | Hydraulic control valve and telescopic boom control system with same |
| JP4761410B2 (en) * | 1999-09-13 | 2011-08-31 | パスカルエンジニアリング株式会社 | Die cushion device |
| CN202296914U (en) * | 2011-08-25 | 2012-07-04 | 徐州重型机械有限公司 | Telescopic arm control system and crane |
| CN203717538U (en) * | 2013-12-10 | 2014-07-16 | 徐州重型机械有限公司 | System for crane for preventing cavitation of oil cylinder core pipe and crane adopting system |
-
2013
- 2013-12-10 CN CN201310667430.4A patent/CN103615440B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4761410B2 (en) * | 1999-09-13 | 2011-08-31 | パスカルエンジニアリング株式会社 | Die cushion device |
| KR20040084499A (en) * | 2003-03-28 | 2004-10-06 | 학교법인 울산공업학원 | hydraulic circuit of active load simulator |
| US6959726B2 (en) * | 2003-10-01 | 2005-11-01 | Husco International, Inc. | Valve assembly for attenuating bounce of hydraulically driven members of a machine |
| CN201428657Y (en) * | 2009-03-30 | 2010-03-24 | 徐州重型机械有限公司 | Hydraulic control valve and telescopic boom control system with same |
| CN202296914U (en) * | 2011-08-25 | 2012-07-04 | 徐州重型机械有限公司 | Telescopic arm control system and crane |
| CN203717538U (en) * | 2013-12-10 | 2014-07-16 | 徐州重型机械有限公司 | System for crane for preventing cavitation of oil cylinder core pipe and crane adopting system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104879337A (en) * | 2015-04-22 | 2015-09-02 | 北汽福田汽车股份有限公司 | Oil cylinder switching valve and hydraulic system comprising same and engineering machinery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103615440B (en) | 2016-04-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103244501B (en) | A kind of hydraulic control valve group, hydraulic system and engineering machinery | |
| CN104747535A (en) | Hydraulic buffering system and engineering machine | |
| CN104692266A (en) | Hydraulic system for telescopic buffer of crane boom and crane | |
| CN105545853A (en) | Telescopic control valve, multi-stage telescopic hydraulic system and hoist jib telescopic hydraulic control system | |
| CN203051269U (en) | Hydraulic system and engineering machinery with same | |
| CN102734501B (en) | Converging multipath valve and crane hydraulic system | |
| CN103420290B (en) | Telescopic protection system and crane | |
| CN203717538U (en) | System for crane for preventing cavitation of oil cylinder core pipe and crane adopting system | |
| CN203214291U (en) | Concrete pump truck and automatic reverse pump device thereof | |
| CN103615440A (en) | Oil cylinder core tube cavitation corrosion prevention system for crane and crane with same | |
| EP1696137A3 (en) | Flow control valve having a pressure reducing valve | |
| CN103225633B (en) | Hydraulicdirectional control valve, hydraulicdirectional control valve group and engineering machinery | |
| CN109281874A (en) | A kind of the major loop Load Relief System and pile press machine of guide's hydraulic control | |
| GB2536177A (en) | Fluidic system | |
| CN105275899A (en) | Concrete pumping equipment hydraulic system and concrete pumping equipment | |
| CN104176664A (en) | Hydraulic system for preventing forward running of telescopic arm of crane and crane | |
| CN103206423B (en) | A kind of hydraulic system and engineering machinery | |
| CN104132211A (en) | Fire control water distributor with three water outlets | |
| US20160017901A1 (en) | Pressure loss reducing circuit for a works machine | |
| WO2014135285A1 (en) | Regenerative circuit of hydraulic apparatus | |
| CN105422530A (en) | Pilot integrated multi-way valve group and crane | |
| CN104481944A (en) | Depressurizing system and engineering machinery | |
| CN107208399B (en) | Control valve for construction equipment | |
| CN210829934U (en) | Hydraulic combination valve | |
| CN105508329B (en) | Pumps hydraulic control system and concrete pumping equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 221000 Jiangsu city of Xuzhou Province Economic and Technological Development Zone of High Road No. 68 Patentee after: Xuzhou Heavy Machinery Co., Ltd. Address before: 221004 No. 165 Copper Mountain Road, Jiangsu, Xuzhou Patentee before: Xuzhou Heavy Machinery Co., Ltd. |