CN107830001B - Scissor fork type aerial work platform and hydraulic system thereof - Google Patents
Scissor fork type aerial work platform and hydraulic system thereof Download PDFInfo
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- CN107830001B CN107830001B CN201711211778.7A CN201711211778A CN107830001B CN 107830001 B CN107830001 B CN 107830001B CN 201711211778 A CN201711211778 A CN 201711211778A CN 107830001 B CN107830001 B CN 107830001B
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- 239000003921 oil Substances 0.000 claims abstract description 199
- 239000010729 system oil Substances 0.000 claims abstract description 13
- 230000009471 action Effects 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000020169 heat generation Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
- B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
- B66F11/042—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations actuated by lazy-tongs mechanisms or articulated levers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/255—Flow control functions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/88—Control measures for saving energy
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Fluid-Pressure Circuits (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The application discloses a hydraulic system, which comprises a floating oil cylinder, a balance valve for delivering oil to a cavity of the floating oil cylinder and a reversing valve connected with the balance valve, wherein the balance valve is connected with the reversing valve; the reversing valve is connected with an oil supply pump for supplying oil to the reversing valve; the steering valve is connected with the running system oil supply port through a first one-way valve, and the steering valve is connected with the oil supply pump through a second one-way valve. In the hydraulic system provided by the application, main oil supply operation is performed to the floating oil cylinders in the system through the oil supply ports of the traveling system, auxiliary oil supply operation is performed to the floating oil cylinders in the system through the oil supply pumps, so that the oil supply operation of the floating oil cylinders can be mainly obtained from the traveling system, the flow rate at the oil supply side of the oil supply pumps can be reduced to a smaller state, the condition of continuous high-pressure overflow of the flow is avoided, and the efficiency is obviously improved. The application also discloses a scissor type aerial work platform comprising the hydraulic system.
Description
Technical Field
The application relates to the technical field of hydraulic control, in particular to a hydraulic system. In addition, the application also relates to a scissor type aerial work platform comprising the hydraulic system.
Background
When the scissors walk on uneven roads, in order to improve the stability and comfort of the vehicle, the left and right tires need to be automatically adjusted in height according to road conditions, and the influence of uneven roads is compensated.
At present, a mode that two floating oil cylinders are connected in parallel and balance valves are balanced is commonly adopted, one path of pressure oil is led out of a pump by a flow control valve to enter the floating oil cylinders, and automatic compensation of uneven pavement in the walking process is achieved.
According to the diesel scissor fork of the prior art, oil liquid of the functional control pump is supplied to the floating valve block under the running working condition, all flow of the functional control pump is supplied to the floating valve block for most of time, and flows back to the oil tank through the low-pressure overflow valve, and all energy provided by the oil liquid pump is used for heating to do idle work, so that the problems of improvement of system efficiency, long-time working in unfavorable high-temperature environment and the like are caused, and a radiator is generally required to be added, however, the control of system cost is not facilitated.
In summary, how to provide a hydraulic system with high efficiency and low heat generation is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present application aims to provide a hydraulic system with high efficiency and low heat generation.
Another object of the application is to provide a scissor aerial work platform comprising the hydraulic system as described above.
In order to achieve the above object, the present application provides the following technical solutions:
a hydraulic system is used for a scissor type aerial work platform and comprises a floating oil cylinder, a balance valve used for conveying oil to a cavity of the floating oil cylinder and a reversing valve connected with the balance valve; the reversing valve is connected with an oil supply pump for supplying oil to the reversing valve; the steering valve is connected with the running system oil supply port through a first one-way valve, and the steering valve is connected with the oil supply pump through a second one-way valve.
Preferably, an inlet of the second check valve is connected with the oil supply pump through a flow control valve, and the other outlet of the flow control valve is connected with an action functional valve block.
Preferably, the reversing valve comprises a first reversing valve and a second reversing valve; the balancing valve comprises a first balancing valve and a second balancing valve;
the third port of the first reversing valve and the third port of the second reversing valve are both connected with the outlet of the first one-way valve; the first reversing valve and the second reversing valve are also connected with an oil return tank;
the first port of the first reversing valve is connected with the second port of the first balancing valve and the second port of the second balancing valve, and the first port of the second reversing valve is connected with the first port of the first balancing valve and the first port of the second balancing valve.
Preferably, the floating oil cylinder comprises a left floating oil cylinder and a right floating oil cylinder;
the two outlets of the first balance valve are respectively connected with the rod cavity and the rodless cavity of the left floating oil cylinder, and the two outlets of the second balance valve are respectively connected with the rod cavity and the rodless cavity of the right floating oil cylinder.
Preferably, the outlet of the first one-way valve and the outlet of the second one-way valve are respectively connected with an overflow valve for determining the safety pressure of the floating oil cylinder, and the outlet of the overflow valve is connected with the oil return tank.
Preferably, the oil supply port of the oil supply pump is connected with an inlet of a third reversing valve for controlling whether to supply oil to the action function valve block, and the other outlet of the flow control valve is connected with an outlet of the third reversing valve in parallel and is connected with the action function valve block.
Preferably, the hydraulic control device is used for controlling the oil supply to the action function valve block through the walking pressure, the hydraulic control device is connected with the oil supply port of the walking system and used for acquiring the walking pressure of the walking system, and the hydraulic control device is connected with the third reversing valve.
Preferably, the hydraulic control device comprises a shuttle valve and a hydraulic control sequence valve which is used for controlling the oil supply pump to supply oil to the action function valve block together with the third reversing valve;
two inlets of the shuttle valve are correspondingly connected with an outlet of the first one-way valve and an oil supply port of the oil supply pump respectively, and an outlet of the shuttle valve is connected with an external control port of the hydraulic control sequence valve;
an inlet of the hydraulic control sequence valve is connected with an oil supply port of the oil supply pump, and an outlet of the hydraulic control sequence valve is connected with an inlet of the third reversing valve;
when the walking pressure is lower than the set value of the hydraulic control sequence valve, the hydraulic control sequence valve resets to control the oil supply to the floating oil cylinder;
and when the walking pressure is equal to or higher than the set value of the hydraulic control sequence valve, the hydraulic control sequence valve is opened to realize unloading of the action function valve block.
A scissor aerial work platform comprising a hydraulic system, the hydraulic system being any of the hydraulic systems described above.
In the hydraulic system provided by the application, main oil supply operation is performed to the floating oil cylinders in the system through the oil supply ports of the traveling system, auxiliary oil supply operation is performed to the floating oil cylinders in the system through the oil supply pumps, so that the oil supply operation of the floating oil cylinders can be mainly obtained from the traveling system, the flow rate at the oil supply side of the oil supply pumps can be reduced to a smaller state, the condition of continuous high-pressure overflow of the flow is avoided, a larger heating source is not generated, the system is energy-saving, and the efficiency is obviously improved.
The application also provides a scissor type aerial work platform comprising the hydraulic system.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a hydraulic system according to a first embodiment of the present application;
fig. 2 is a schematic system diagram of a second embodiment of a hydraulic system according to the present application.
In fig. 1-2:
a right floating cylinder 1 and a left floating cylinder 2;
a first balance valve 3, a second balance valve 11; a first reversing valve 4 and a second reversing valve 10;
a first one-way valve 5, a second one-way valve 9, an overflow valve 6 and a flow control valve 7;
a third reversing valve 8, a shuttle valve 12 and a pilot operated sequence valve 13.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The core of the application is to provide a hydraulic system. Another core of the application is to provide a scissor aerial work platform comprising the hydraulic system described above.
Referring to fig. 1 and 2, fig. 1 is a schematic system diagram of a hydraulic system according to a first embodiment of the present application; fig. 2 is a schematic system diagram of a second embodiment of a hydraulic system according to the present application.
The hydraulic system provided by the application is mainly used for a scissor type aerial work platform, and comprises a floating oil cylinder, a balance valve used for conveying oil to a cavity of the floating oil cylinder and a reversing valve connected with the balance valve; the reversing valve is connected with an oil supply pump for supplying oil to the reversing valve, and also comprises a running system oil supply port for supplying oil to the reversing valve, wherein the reversing valve is connected with the running system oil supply port through a first one-way valve 5, and is connected with the oil supply pump through a second one-way valve 9.
It should be noted that the oil supply pump may be used to supply oil to the reversing valve, that is, to supply oil to the floating cylinder, and of course, the oil supply pump may also supply oil to the control function valve block.
The reversing valve is also connected with the oil supply port of the running system so as to provide oil for the reversing valve by the oil supply port of the running system, and the reversing valve is connected with the first one-way valve 4 so as to prevent the oil from flowing back to the oil supply port of the running system.
In the hydraulic system provided by the application, main oil supply operation is performed to the floating oil cylinders in the system through the oil supply ports of the traveling system, auxiliary oil supply operation is performed to the floating oil cylinders in the system through the oil supply pumps, so that the oil supply operation of the floating oil cylinders can be mainly obtained from the traveling system, the flow rate at the oil supply side of the oil supply pumps can be reduced to a smaller state, the condition of continuous high-pressure overflow of the flow is avoided, a larger heating source is not generated, the system is energy-saving, and the efficiency is obviously improved.
On the basis of the above embodiment, the reversing valve comprises a first reversing valve 4 and a second reversing valve 10; the third port of the first reversing valve 4 and the third port of the second reversing valve 10 are both connected with the outlet of the first one-way valve 4.
On the basis of any one of the embodiments, the inlet of the second one-way valve 9 is connected with the oil supply pump through the flow control valve 7, and the other outlet of the flow control valve 7 is connected with the action functional valve block so as to realize unloading operation; the first reversing valve 4 and the second reversing valve 10 are also connected to a return tank.
On the basis of the above embodiment, the balancing valve comprises a first balancing valve 3 and a second balancing valve 11; the first port of the first reversing valve 4 is connected to the second port of the first balancing valve 3 and the second port of the second balancing valve 11, and the first port of the second reversing valve 10 is connected to the first port of the first balancing valve 3 and the first port of the second balancing valve 11.
In a specific embodiment, the hydraulic system floating cylinder, the first balance valve 3, the second balance valve 11, the first reversing valve 4, the second reversing valve 10 and the flow control valve 7;
the outlets of the first balance valve 3 are correspondingly connected with a rod cavity and a rodless cavity of the left floating oil cylinder 2 respectively, and the outlets of the second balance valve 11 are correspondingly connected with the rodless cavity and the rod cavity of the right floating oil cylinder 1 respectively;
the outlet of the first reversing valve 4 is connected with the inlets of the first balancing valve 3 and the second balancing valve 11, and the outlet of the second reversing valve 10 is connected with the other inlets of the first balancing valve 3 and the second balancing valve 11;
the inlet of the first reversing valve 4 and the inlet of the second reversing valve 10 are connected with a running system oil supply port for main oil supply through a first one-way valve 5;
the inlet of the first reversing valve 4 and the inlet of the second reversing valve 10 are both connected with the outlet of the flow control valve 7 through a second one-way valve 9, the inlet of the flow control valve 7 is connected with an oil supply pump for auxiliary oil supply, and the other outlet of the flow control valve 7 is connected with an action functional valve block for supplying oil to the action functional valve block; the first reversing valve 4 and the second reversing valve 10 are also connected to a return tank.
The number of the floating cylinders may be two or more, and the floating cylinders may be fed with oil through the first balance valve 3 and the second balance valve 11, respectively. The outlets of the first reversing valve 4 and the second reversing valve 10 are respectively connected with corresponding balance valves.
In the hydraulic system provided by the application, main oil supply operation is performed to the floating oil cylinders in the system through the oil supply ports of the traveling system, auxiliary oil supply operation is performed to the floating oil cylinders in the system through the oil supply pumps, and the oil return boxes connected with the first reversing valve 4 and the second reversing valve 10 are also arranged, so that the oil supply operation of the floating oil cylinders can be obtained from the traveling system, the lifting movement and the traveling operation of the floating oil cylinders are synchronous, the system does not have the condition of continuous high-pressure overflow of flow, a heating source is removed, the system is energy-saving, and the efficiency is obviously improved.
On the basis of the embodiment, the outlet of the first check valve 4 and the outlet of the second check valve 10 are respectively connected with an overflow valve 6 for determining the safety pressure of the floating cylinder, and the outlet of the overflow valve 6 is connected with a return tank.
On the basis of the above embodiment, the oil supply port of the oil supply pump is connected to the inlet of the third reversing valve 8 for controlling whether to supply oil to the operation function valve block, and the other outlet of the flow control valve 7 is connected in parallel with the outlet of the third reversing valve 8 and is connected to the operation function valve block. The third reversing valve 8 is connected with the action function valve to realize the unloading function.
In a particular embodiment provided by the application, the pressurized oil of the oil supply pump is fed to the b port of the flow control valve 7 and to the inlet port of the third reversing valve 8.
The port a of the flow control valve 7 is connected with the inlet of the second one-way valve 9, the outlet of the second one-way valve 9 is connected with the port c of the first reversing valve 4, the port b of the second reversing valve 10 and the inlet of the overflow valve 6, and the outlet of the second one-way valve 9 is communicated with the running system oil supply port P2.
The c port of the flow control valve 7 is connected in parallel with the outlet of the third reversing valve 8 as the inlet of the downstream acting functional valve block, namely, the connecting acting functional valve block.
The outlet a of the first reversing valve 4 is connected to the inlet b of the first balancing valve 3 and the inlet b of the second balancing valve 11,
the outlet a of the second reversing valve 10 is connected with the inlet a of the first balancing valve 3 and the inlet a of the second balancing valve 11;
the port b of the first reversing valve 4 and the port c of the second reversing valve 10 are connected with the outlet of the overflow valve 6 and are connected with the oil return tank.
The outlet c and the outlet d of the first balance valve 3 are respectively and correspondingly connected with the rod cavity and the rodless cavity of the left floating oil cylinder 2, and the outlet c and the outlet d of the second balance valve 11 are respectively and correspondingly connected with the rodless cavity and the rod cavity of the right floating oil cylinder 1.
It should be noted that, the floating system oil source is mainly provided by the running system oil supply port P2, and the auxiliary oil supply is performed by the oil supply pump oil supply port P. The oil of the oil supply pump is simultaneously supplied to the downstream oil source P1 serving as the action function valve group.
The third reversing valve 8 controls whether the oil supply port P of the oil supply pump supplies oil to the floating oil cylinder, and the safety pressure of the floating system is set and controlled by the overflow valve 6.
The first check valve 5 and the second check valve 9 separate the pressure oil line of the running system from the pressure oil of the oil supply pump.
The left floating cylinder 2 and the right floating cylinder 1 are respectively connected with a first balance valve 3 and a second balance valve 11, and are controlled to be opened and closed by a first reversing valve 4 and a second reversing valve 10.
In the scheme provided by any one of the embodiments, when the platform walks normally, the floating oil cylinder is directly supplied with oil from the oil supply port P2 of the walking system, the oil supply port P of the oil supply pump passes through the third reversing valve 8 and is unloaded by the downstream acting functional valve, and the oil supply pump P does not overflow through the overflow valve 6. However, only when the wheel falls into the pit and the floating pressure is insufficient, the third directional valve 8 is opened, and the oil supply port P of the oil supply pump supplies oil to the floating cylinder.
According to the technical scheme, the lifting movement and the walking operation of the floating oil cylinder are synchronous by changing the floating oil source, and the oil source operated by the floating oil cylinder does not directly take oil from the oil supply pump during normal walking, but adopts pressure oil of a walking system; the output flow of the pump is unloaded through the action functional valve block, the system does not have the condition of continuous flow high-pressure overflow, a heating source is removed, the system is energy-saving, and the efficiency is obviously improved.
On the basis of the embodiment, the hydraulic control device for supplying oil to the action function valve block through the traveling pressure control is further included, the hydraulic control device is connected with the traveling system oil supply port and is used for automatically acquiring the oil source of the auxiliary oil supply pump under the condition that the traveling system pressure is lower than the opening pressure of the balance valve, and the hydraulic control device is combined with the third reversing valve 8 to realize unloading of the normal pressure auxiliary oil supply pump.
It should be noted that, the hydraulic control device may be a solenoid valve control device, and is used for supplying oil to the action function valve block through traveling pressure control, specifically, the hydraulic control device is connected with a traveling system oil supply port, and is used for obtaining traveling pressure of the traveling system, and the hydraulic pressure may be obtained through a detection device, or directly obtained through the hydraulic control device, when the traveling pressure is lower than a set value of the hydraulic control sequence valve 13, the hydraulic control device controls the floating cylinder to supply oil, and when the traveling pressure is equal to or higher than the set value of the hydraulic control sequence valve 13, the hydraulic control sequence valve is opened to realize unloading of the action function valve block.
On the basis of the above embodiment, the pilot operated device comprises a shuttle valve 12 and a pilot operated sequence valve 13 for controlling the oil feed pump together with the third reversing valve 8 to feed oil to the service function valve block.
The two inlets of the shuttle valve 12 are correspondingly connected with the outlet of the first one-way valve 5 and the oil supply port of the oil supply pump respectively, and the outlet of the shuttle valve 12 is connected with the external control port of the hydraulic control sequence valve 13.
An inlet of the pilot operated sequence valve 13 is connected with an oil supply port of the oil supply pump, and an outlet of the pilot operated sequence valve 13 is connected with an inlet of the third reversing valve 8.
When the walking pressure is lower than the set value of the hydraulic control sequence valve 13, the hydraulic control sequence valve resets to control the oil supply to the floating oil cylinder; when the walking pressure is equal to or higher than the set value of the hydraulic control sequence valve 13, the hydraulic control sequence valve is opened to realize unloading of the action function valve block, so that continuous overflow is avoided.
Referring to fig. 2, fig. 2 is a schematic system diagram of a hydraulic system according to a second embodiment of the present application. As shown in fig. 2, differs from fig. 1 in that a shuttle valve 12 and a pilot operated sequence valve 13 are also included.
The inlet of the shuttle valve 12 is respectively connected with the oil supply pump P and the pressure source P2 of the running system, the outlet of the shuttle valve is connected with the external control port of the hydraulic control sequence valve 13, and the outlet of the hydraulic control sequence valve 13 is connected with the inlet of the third reversing valve 8.
The floating system oil source is provided by an oil supply pump P and a traveling system P2, and the oil of the oil supply pump is simultaneously provided for the downstream oil source P1 serving as an action functional valve group.
The pilot operated sequence valve 13 and the second reversing valve 10 jointly control whether the oil supply pump P supplies oil to the floating valve blocks, and when the oil pressure of the running system is lower than the set value of the pilot operated sequence valve 13, the pump P can be ensured to supply oil to the floating system.
On the basis of any one of the above embodiments, the floating cylinders comprise a left floating cylinder 2 and a right floating cylinder 1; the two outlets of the first balance valve 3 are respectively connected with a rod cavity and a rodless cavity of the floating oil cylinder 2, and the two outlets of the second balance valve 11 are respectively connected with the rod cavity and the rodless cavity of the floating oil cylinder 1.
Alternatively, when the types of scissor type aerial work platforms are different, a plurality of floating cylinders can also exist, and the plurality of floating cylinders need to be controlled by different balance valves.
On the basis of any of the above embodiments, the first balancing valve 3 comprises at least two inlets and at least two outlets.
On the basis of any one of the above embodiments, the first reversing valve 4, the first one-way valve 5, the overflow valve 6, the flow control valve 7, the third reversing valve 8, the second one-way valve 9 and the second reversing valve 10 are integrated in a floating integrated valve block.
Alternatively, the shuttle valve 12 and the pilot sequence valve 13 may be integrated in the floating integrated valve block, or the shuttle valve 12 and the pilot sequence valve 13 may be integrated in other valve blocks for coupling between blocks.
According to the hydraulic system provided by the application, the oil source of the floating oil cylinder is changed, so that the floating operation and the walking operation can be synchronous, and the floating oil source does not directly take oil from the oil supply pump under normal conditions, but adopts the pressure oil of the walking system; the output flow of the oil supply pump is unloaded through the action functional valve block, the system does not have the condition of continuous flow high-pressure overflow, a heating source is removed, the system saves energy, and the efficiency is obviously improved; when the action functional valve group works, the running system and the floating oil cylinder do not work, the oil supply pump can normally ensure the supply of the functional control valve block, and the heating source is reduced without a flow control valve.
In addition to the main structure of the hydraulic system provided by each embodiment, the application also provides a scissor type aerial work platform comprising the hydraulic system disclosed by the embodiment, the scissor type aerial work platform comprises the hydraulic system, the hydraulic system can avoid the conditions of low efficiency and large heat generation, and the structure of other parts of the scissor type aerial work platform is referred to the prior art, and is not repeated herein.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The scissor type aerial work platform and the hydraulic system thereof provided by the application are described in detail. The principles and embodiments of the present application have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present application and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the application can be made without departing from the principles of the application and these modifications and adaptations are intended to be within the scope of the application as defined in the following claims.
Claims (5)
1. A hydraulic system is used for a scissor type aerial work platform and comprises a floating oil cylinder, a balance valve used for conveying oil to a cavity of the floating oil cylinder and a reversing valve connected with the balance valve; the reversing valve is connected with an oil supply pump for supplying oil to the reversing valve; the steering valve is characterized by further comprising a running system oil supply port for supplying oil to the steering valve, wherein the steering valve is connected with the running system oil supply port through a first one-way valve (5), and the steering valve is connected with the oil supply pump through a second one-way valve (9);
an inlet of the second one-way valve (9) is connected with the oil supply pump through a flow control valve (7), and the other outlet of the flow control valve (7) is connected with an action functional valve block;
the oil supply port of the oil supply pump is connected with the inlet of a third reversing valve (8) for controlling whether to supply oil to the action functional valve block, and the other outlet of the flow control valve (7) is connected with the outlet of the third reversing valve (8) in parallel and is connected with the action functional valve block;
the hydraulic control device is connected with the oil supply port of the running system and used for acquiring the running pressure of the running system, and the hydraulic control device is connected with the third reversing valve (8);
the hydraulic control device comprises a shuttle valve (12) and a hydraulic control sequence valve (13) which is used for controlling the oil supply pump to supply oil to the action functional valve block together with the third reversing valve (8);
two inlets of the shuttle valve (12) are correspondingly connected with an outlet of the first one-way valve (5) and an oil supply port of the oil supply pump respectively, and an outlet of the shuttle valve (12) is connected with an external control port of the hydraulic control sequence valve (13);
an inlet of the hydraulic control sequence valve (13) is connected with an oil supply port of the oil supply pump, and an outlet of the hydraulic control sequence valve (13) is connected with an inlet of the third reversing valve (8);
when the walking pressure is lower than the set value of the hydraulic control sequence valve (13), the hydraulic control sequence valve resets to control the oil supply to the floating oil cylinder;
when the walking pressure is equal to or higher than the set value of the hydraulic control sequence valve (13), the hydraulic control sequence valve is opened to realize unloading of the action functional valve block.
2. The hydraulic system according to claim 1, characterized in that the reversing valve comprises a first reversing valve (4) and a second reversing valve (10); the balancing valve comprises a first balancing valve (3) and a second balancing valve (11);
the third port of the first reversing valve (4) and the third port of the second reversing valve (10) are both connected with the outlet of the first one-way valve (5); the first reversing valve (4) and the second reversing valve (10) are also connected with an oil return tank;
the first port of the first reversing valve (4) is connected with the second port of the first balancing valve (3) and the second port of the second balancing valve (11), and the first port of the second reversing valve (10) is connected with the first port of the first balancing valve (3) and the first port of the second balancing valve (11).
3. Hydraulic system according to claim 2, characterized in that the floating cylinders comprise a left floating cylinder (2) and a right floating cylinder (1);
two outlets of the first balance valve (3) are respectively connected with a rod cavity and a rodless cavity of the left floating oil cylinder (2), and two outlets of the second balance valve (11) are respectively connected with the rod cavity and the rodless cavity of the right floating oil cylinder (1).
4. Hydraulic system according to claim 1, characterized in that the outlet of the first non-return valve (5) and the outlet of the second non-return valve (9) are connected with a relief valve (6) for determining the relief pressure of the floating cylinder, respectively, the outlet of the relief valve (6) being connected with a return tank.
5. A scissor aerial platform comprising a hydraulic system, wherein the hydraulic system is as claimed in any one of claims 1 to 4.
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| CN201711211778.7A CN107830001B (en) | 2017-11-28 | 2017-11-28 | Scissor fork type aerial work platform and hydraulic system thereof |
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| CN110566522A (en) * | 2019-09-06 | 2019-12-13 | 湖南星邦重工有限公司 | Active floating control system for underframe and aerial work platform thereof |
| CN112012974A (en) * | 2020-08-24 | 2020-12-01 | 天水师范学院 | Novel hydraulic synchronous control system for lifting and lowering of oil drilling machine |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002067642A (en) * | 2000-09-05 | 2002-03-08 | Aichi Corp | Vehicle wheel driving unit |
| JP2002067781A (en) * | 2000-09-05 | 2002-03-08 | Aichi Corp | Vehicular wheel traveling device |
| CN102322454A (en) * | 2011-09-05 | 2012-01-18 | 长沙中联重工科技发展股份有限公司 | Concrete pumping equipment and hydraulic system thereof |
| CN202541635U (en) * | 2011-10-12 | 2012-11-21 | 石河子贵航农机装备有限责任公司 | Locomotive front axle horizontal balance mechanism |
| CN104089078A (en) * | 2014-07-16 | 2014-10-08 | 上海豪高机电科技有限公司 | Proportional control device used for linear-stroke valve |
| CN105156393A (en) * | 2015-09-30 | 2015-12-16 | 中国船舶重工集团公司第七一九研究所 | Low-noise integrated pneumatic valve |
| CN205841354U (en) * | 2016-07-08 | 2016-12-28 | 中国航空动力机械研究所 | Oil circuit reversing arrangement |
| CN106494179A (en) * | 2016-11-23 | 2017-03-15 | 徐工消防安全装备有限公司 | Automatically controlled vehicle bridge balance system and apply the self-propelled aerial work platform of the system |
| CN106574640A (en) * | 2014-10-23 | 2017-04-19 | 南京迈瑞生物医疗电子有限公司 | Hydraulic drive system for operating table |
| CN107020907A (en) * | 2017-04-12 | 2017-08-08 | 管中林 | A kind of interconnection suspension three-wheel Insecticide sprayer for realizing active balancing |
| CN207961103U (en) * | 2017-11-28 | 2018-10-12 | 湖南星邦重工有限公司 | A kind of scissor aerial work platform and its hydraulic system |
-
2017
- 2017-11-28 CN CN201711211778.7A patent/CN107830001B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002067642A (en) * | 2000-09-05 | 2002-03-08 | Aichi Corp | Vehicle wheel driving unit |
| JP2002067781A (en) * | 2000-09-05 | 2002-03-08 | Aichi Corp | Vehicular wheel traveling device |
| CN102322454A (en) * | 2011-09-05 | 2012-01-18 | 长沙中联重工科技发展股份有限公司 | Concrete pumping equipment and hydraulic system thereof |
| CN202541635U (en) * | 2011-10-12 | 2012-11-21 | 石河子贵航农机装备有限责任公司 | Locomotive front axle horizontal balance mechanism |
| CN104089078A (en) * | 2014-07-16 | 2014-10-08 | 上海豪高机电科技有限公司 | Proportional control device used for linear-stroke valve |
| CN106574640A (en) * | 2014-10-23 | 2017-04-19 | 南京迈瑞生物医疗电子有限公司 | Hydraulic drive system for operating table |
| CN105156393A (en) * | 2015-09-30 | 2015-12-16 | 中国船舶重工集团公司第七一九研究所 | Low-noise integrated pneumatic valve |
| CN205841354U (en) * | 2016-07-08 | 2016-12-28 | 中国航空动力机械研究所 | Oil circuit reversing arrangement |
| CN106494179A (en) * | 2016-11-23 | 2017-03-15 | 徐工消防安全装备有限公司 | Automatically controlled vehicle bridge balance system and apply the self-propelled aerial work platform of the system |
| CN107020907A (en) * | 2017-04-12 | 2017-08-08 | 管中林 | A kind of interconnection suspension three-wheel Insecticide sprayer for realizing active balancing |
| CN207961103U (en) * | 2017-11-28 | 2018-10-12 | 湖南星邦重工有限公司 | A kind of scissor aerial work platform and its hydraulic system |
Non-Patent Citations (1)
| Title |
|---|
| 侯会喜.《液压传动与气动技术》.第191-192页,2008,第191-192页. * |
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