CN116123161A - Hydraulic control system for aerial working platform - Google Patents
Hydraulic control system for aerial working platform Download PDFInfo
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- CN116123161A CN116123161A CN202211717538.5A CN202211717538A CN116123161A CN 116123161 A CN116123161 A CN 116123161A CN 202211717538 A CN202211717538 A CN 202211717538A CN 116123161 A CN116123161 A CN 116123161A
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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
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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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
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
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- Fluid Mechanics (AREA)
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- Forklifts And Lifting Vehicles (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to a hydraulic system of engineering machinery, and provides a hydraulic control system of an aerial working platform, which comprises a main valve group, a platform control valve group, a chassis control valve group and an oil supply element, wherein the oil supply element is respectively connected with the main valve group and the chassis control valve group for supplying oil, the main valve group comprises a proportional electromagnetic valve and a main valve reversing valve used for connecting a main valve executing unit, the proportional electromagnetic valve is connected with an oil inlet of the platform control valve group for supplying oil, the proportional electromagnetic valve is provided with a main valve platform flow coil for controlling the opening degree of a valve port, the current value input by the main valve platform flow coil can be regulated according to different action working conditions of the platform control valve group so as to control the flow of the main valve group input by the proportional electromagnetic valve, and the oil supply unit can regulate the output flow according to the load pressure of the main valve group and the chassis control valve group. The hydraulic control system of the aerial working platform can regulate the flow according to different action working conditions of the platform and the chassis, reduces flow waste and reduces energy consumption.
Description
Technical Field
The invention relates to a hydraulic system of engineering machinery, in particular to a hydraulic control system of an aerial working platform.
Background
In general, a hydraulic control system of an aerial work platform is powered by a power battery, and due to the influence of space and cost, how to reduce energy consumption is a problem that needs to be solved in the first place in the case that the battery capacity cannot be increased.
With the popularization of electric-driven aerial work platforms, the traditional hydraulic control system cannot meet the energy-saving requirement, an energy-saving load-sensitive hydraulic control system needs to be developed, a certain flow is distributed to a platform control valve and a chassis control valve by a main valve in the action of a general load-sensitive system platform and a chassis, the flow generally needs to meet the flow requirement of compound action, but larger flow waste exists when the platform and the chassis are operated singly, and the energy consumption is not reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a hydraulic control system for an aerial working platform, which can regulate flow according to different action working conditions of the platform and a chassis, reduce flow waste and reduce energy consumption.
In order to solve the technical problems, the invention provides a hydraulic control system for an aerial working platform, which comprises a main valve bank, a platform control valve bank, a chassis control valve bank and an oil supply element, wherein the oil supply element is respectively connected with the main valve bank and the chassis control valve bank for supplying oil, the main valve bank comprises a proportional electromagnetic valve and a main valve reversing valve used for connecting a main valve executing unit, the proportional electromagnetic valve is connected with an oil inlet of the platform control valve bank for supplying oil, the platform control valve bank comprises a platform reversing valve used for connecting a platform executing unit, the platform executing unit comprises a plurality of platform executing units, the platform reversing valve is provided with a plurality of main valve platform flow coils for controlling the opening of a valve port, the current value input by the main valve platform flow coils can be adjusted according to different action conditions of the platform executing units, and the oil supply unit can adjust output flow according to the load pressure of the main valve bank and the chassis control valve bank.
The platform executing unit comprises a leveling oil cylinder, a fly arm amplitude changing oil cylinder and a swing motor, wherein the platform reversing valve comprises a leveling reversing valve connected with the leveling oil cylinder, a fly arm amplitude changing reversing valve connected with the fly arm amplitude changing oil cylinder and a swing reversing valve connected with the swing motor, a first current value, a second current value, a third current value and a fourth current value are respectively input into the main valve platform flow coil according to the action working condition of the platform executing unit, and the opening of the valve port of the proportional electromagnetic valve is sequentially controlled to be larger from front to back by the first current value, the second current value, the third current value and the fourth current value, wherein the main valve platform flow coil inputs the first current value when the platform executing unit is in a standby working condition; when the swing motor is in a single-action working condition, the main valve platform flow coil inputs the second current value; when the leveling oil cylinder or the fly jib luffing oil cylinder is in a single action working condition, the main valve platform flow coil inputs the third current value; and when the leveling oil cylinder and the fly jib luffing oil cylinder are in a compound action working condition, the flow coil of the main valve platform inputs the fourth current value.
Preferably, the platform control valve group comprises a platform oil inlet oil path and a platform oil return oil path, and a platform unloading valve is arranged between the platform oil inlet oil path and the platform oil return oil path.
More preferably, a fixed difference overflow valve is arranged between the platform oil inlet oil path and the platform oil return oil path, and a spring end of the fixed difference overflow valve is connected with a platform load feedback oil path of the platform control valve group.
Preferably, the main valve group comprises a platform pressure compensation valve, and the platform pressure compensation valve is connected with the proportional electromagnetic valve so as to control the constant oil pressure difference of the input and output of the proportional electromagnetic valve.
Specifically, the oil supply element is a load sensitive variable plunger pump, and the load feedback oil circuit of the main valve group and the chassis control valve group is connected with the load feedback oil port of the load sensitive variable plunger pump.
Preferably, the chassis control valve group comprises a front chassis control valve group, a rear chassis control valve group and a chassis stop valve, wherein an oil inlet of the front chassis control valve group and an oil inlet of the rear chassis control valve group are connected with an output oil port of the load sensitive variable plunger pump through the chassis stop valve together, and respective load feedback oil paths of the front chassis control valve group and the rear chassis control valve group are connected with a load feedback oil port of the load sensitive variable plunger pump 5 together.
Preferably, the main valve group comprises a main valve oil inlet oil path, a main valve oil return oil path and a main valve load feedback oil path, the main valve reversing valve and the proportional solenoid valve can guide respective load pressure into the main valve load feedback oil path, and the main valve load feedback oil path is connected with a load feedback oil port of the load sensitive variable plunger pump.
Preferably, a main valve unloading valve is arranged between the main valve oil return oil path and the load feedback oil path.
Preferably, a main valve overflow valve is arranged between the main valve oil inlet oil path and the main valve oil return oil path, and a main valve load feedback overflow valve is arranged between the main valve load feedback oil path and the main valve oil return oil path.
Through the scheme, the beneficial effects of the invention are as follows:
according to the hydraulic control system of the aerial working platform, the oil supply element is respectively connected with the main valve bank and the chassis control valve bank to supply oil, the main valve bank is connected with the platform control valve bank through the proportional electromagnetic valve to supply oil, and the proportional electromagnetic valve controls the opening of a valve port according to the magnitude of a current value input by a flow coil of the main valve platform, so that when an operation platform acts, different current values can be input according to different action working conditions of an actuator of the platform, and the flow magnitude of the proportional electromagnetic valve input into the platform control valve bank can be controlled; when the chassis is operated, the oil supply unit directly supplies oil to the chassis control valve group, and the oil supply unit can adjust the output flow according to the load pressure of the chassis control valve group. The hydraulic control system of the aerial working platform is respectively optimized for flow distribution during platform action and chassis action, can perform flow regulation according to action requirements, greatly reduces flow waste and reduces energy consumption.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:
FIG. 1 is a hydraulic schematic diagram of one embodiment of a hydraulic control system for an aerial work platform of the present invention;
FIG. 2 is a hydraulic schematic of one embodiment of a main valve block;
FIG. 3 is a hydraulic schematic of one embodiment of a platform control valve block;
FIG. 4 is a hydraulic schematic of an embodiment of a front chassis control valve block;
fig. 5 is a hydraulic schematic of an embodiment of a rear chassis control valve block.
Description of the reference numerals
1 main valve group 11 proportion electromagnetic valve
12 main valve execution unit 121 amplitude-variable oil cylinder
122 telescopic cylinder 123 rotary motor
13 main valve unloading valve 14 main valve overflow valve
15 main valve load feedback overflow valve 16 platform pressure compensating valve
17 amplitude changing reversing valve 18 telescopic reversing valve
Main valve oil inlet circuit of 19-turn reversing valve 101
102 main valve oil return circuit 103 main valve load feedback circuit
2 platform control valve group 21 platform unloading valve
22 platform execution unit 221 leveling cylinder
222 fly arm amplitude-changing oil cylinder 223 swing motor
23 leveling reversing valve 24 fly-arm amplitude reversing valve
25 swing reversing valve 26 constant difference overflow valve
27 platform overflow valve 201 platform oil feed oil circuit
202 platform oil return oil way 203 platform load feedback oil way
Front left steering cylinder of front chassis control valve group 31
32 front right steering cylinder 33 front left telescopic cylinder
Front left steering reversing valve of front right telescopic cylinder 35
36 front right steering reversing valve 37 front landing leg telescopic reversing valve
Rear left steering cylinder of 4 rear chassis control valve group 41
42 rear right steering cylinder 43 rear left telescopic cylinder
Rear left steering reversing valve of 44 rear right telescopic cylinder 45
46 rear right steering reversing valve 47 rear landing leg telescopic reversing valve
5 load sensitive variable plunger pump 6 chassis stop valve
Y1 main valve unloading coil Y2 main valve platform flow coil
Y3 platform unloading coil Y4 first leveling coil
Y5 second leveling coil Y6 first fly jib luffing coil
Y7 second fly jib luffing coil Y8 first swinging coil
Y9 second swinging coil Y10 chassis cut-off coil
Y11 first front left steering coil Y12 second front left steering coil
Detailed Description
The following detailed description of the embodiments of the invention is provided in connection with the accompanying drawings, it being understood that the embodiments described herein are for purposes of illustration and explanation only, and the scope of the invention is not limited to the following embodiments.
In the description of the present invention, unless explicitly stated or limited otherwise, the terms "forming," "providing," "arranging," "connecting," etc. are to be construed broadly, and for example, the connection may be a direct connection, an indirect connection via an intermediary, a fixed connection, a removable connection, or an integral connection; either directly or indirectly via intermediate connectors, or by communication between or interaction between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The invention provides a hydraulic control system of an aerial working platform, referring to fig. 1-5, as a specific embodiment of the hydraulic control system of the aerial working platform of the invention, mainly comprising a main valve group 1, a platform control valve group 2, a chassis control valve group and an oil supply element, wherein the oil supply element is respectively connected with the main valve group 1 and the chassis control valve group for supplying oil, the main valve group 1 comprises a proportional solenoid valve 11 and a main valve reversing valve used for connecting a main valve execution unit 12, the proportional solenoid valve 11 is connected with an oil inlet of the platform control valve group 2 for supplying oil, the platform control valve group 2 comprises a platform reversing valve used for connecting a platform execution unit 22, the platform execution unit 22 comprises a plurality of platform executors, the platform reversing valve is provided with a plurality of main valve platform flow coils Y2 for respectively connecting each platform executor, the proportional solenoid valve 11 is provided with a main valve platform flow coil Y2 for controlling the opening of a valve port, and when an operation platform acts, the current value input by the main valve platform flow coil Y2 can be adjusted according to different action working conditions of the platform executors, so that the flow of the proportional solenoid valve 11 input the platform control valve group 2 can be controlled, and the waste of oil can be generated according to the working conditions of the platform action; in addition, the oil of the oil supply unit does not need to be supplied to the chassis control valve group through the main valve group 1 indirectly, but is directly input to the chassis control valve group, and the oil supply unit can adjust the output flow according to the load pressure of the chassis control valve group, so that the waste of the flow when the chassis acts can be reduced. The hydraulic control system of the aerial working platform is respectively optimized for flow distribution during platform action and chassis action, so that flow waste is greatly reduced, and energy consumption is reduced.
As a specific embodiment of the hydraulic control system for the aerial working platform of the present invention, referring to fig. 1 and 3, the platform executing unit 22 includes a leveling cylinder 221, a fly jib luffing cylinder 222 and a swing motor 223, the platform reversing valve includes a leveling reversing valve 23 connected to the leveling cylinder 221, a fly jib luffing reversing valve 24 connected to the fly jib luffing cylinder 222 and a swing reversing valve 25 connected to the swing motor 223, the leveling reversing valve 23, the fly jib luffing reversing valve 24 and the swing reversing valve 25 are preferably electromagnetic controlled, according to the input of the current obtaining and current losing control flow of the coils corresponding to each reversing valve, a first current value, a second current value, a third current value and a fourth current value are respectively input to the main valve platform flow coil Y2 according to the operation working condition of the platform executing unit 22, and the first current value, the second current value, the third current value and the fourth current value are sequentially controlled to be greater from front to back, wherein, the operation working condition of the platform executing unit 22 corresponding to each current value is specifically as follows:
when the platform execution unit 22 is in a standby working condition, namely the leveling oil cylinder 221, the fly jib luffing oil cylinder 222 and the swing motor 223 are not operated, the corresponding reversing valves are in a neutral state, and the main valve platform flow coil Y2 inputs a first current value, so that the proportional control valve 11 supplies low-pressure low-flow oil to the platform control valve group 2, the platform works to be flushed with low-pressure low-flow, and the response time of the platform operation can be ensured while the flow waste is reduced.
When the swing motor 223 is in a single-action working condition, the first swing coil Y8 or the second swing coil Y9 of the swing reversing valve 25 is powered, the control platform swings leftwards or rightwards, the main valve platform flow coil Y2 inputs a second current value, so that the proportional control valve 11 supplies oil to the platform control valve group 2 at a smaller flow, and the platform action works at a smaller flow.
When the leveling cylinder 221 is in a single-action working condition, the first leveling coil Y4 or the second leveling coil Y5 of the leveling reversing valve 23 is powered on, the control platform is leveled downwards or upwards, the main valve platform flow coil Y2 inputs a third current value, so that the proportional control valve 11 supplies oil to the platform control valve group 2 in a larger flow, and the platform action works in a larger flow;
when the fly arm amplitude changing oil cylinder 222 is in a single action working condition, the first fly arm amplitude changing coil Y6 or the second fly arm amplitude changing coil Y7 of the fly arm amplitude changing reversing valve 24 is electrified to control the fly arm to change amplitude downwards or upwards, and the main valve platform flow coil Y2 inputs a third current value to enable the proportional control valve 11 to supply oil with larger flow to the platform control valve group 2, and the platform action works with larger flow;
when the leveling oil cylinder 221 and the fly arm amplitude varying oil cylinder 222 are in a compound action working condition, the first leveling coil Y4 or the second leveling coil Y5 of the leveling reversing valve 23 is powered on, the control platform is leveled downwards or upwards, meanwhile, the first fly arm amplitude varying coil Y6 or the second fly arm amplitude varying coil Y7 of the fly arm amplitude varying valve 24 is powered on, the control fly arm is amplitude varying downwards or upwards, the main valve platform flow coil Y2 inputs a fourth current value, so that the proportional control valve 11 supplies oil for the maximum flow of the platform control valve group 2, and the platform action works at the maximum flow.
And aiming at different working conditions of the platform action, the current value input by the main valve platform flow coil Y2 is regulated, so that the oil supply flow of the proportional control valve 11 to the platform control valve group 2 is controlled according to the requirement, and the generation of redundant flow waste is avoided. The "low pressure small flow", "large flow", and "maximum flow" merely indicate a comparison between the output flows of the corresponding proportional control valves 11 when different current values are input to the main valve stage flow coil Y2.
As a specific implementation mode of the hydraulic control system of the aerial work platform, referring to fig. 3, the platform control valve group 2 comprises a platform oil inlet oil path 201 and a platform oil return oil path 202, a platform unloading valve 21 is arranged between the platform oil inlet oil path 201 and the platform oil return oil path 202, the platform unloading valve 21 is preferably in electromagnetic control, when the platform execution unit 22 is in a standby working condition, a platform unloading coil Y3 of the platform unloading valve 21 is powered off, the platform unloading valve 21 is opened, so that the platform oil inlet oil path 201 is communicated with the platform oil return oil path 202, and low-pressure low flow supplied by the proportional control valve 11 to the platform control valve group 2 can be directly returned through the platform unloading valve 21, so that the response time of the platform action is ensured; when the actuator in the platform executing unit 22 operates, the platform unloading coil Y3 is de-energized, and the platform unloading valve 21 is closed, so that the platform oil inlet oil path 201 and the platform oil return oil path 202 are blocked, and the platform oil inlet oil path 201 supplies oil to the actuator to operate.
As a preferred implementation mode of the hydraulic control system of the aerial working platform, a fixed difference overflow valve 26 is arranged between a platform oil inlet oil path 201 and a platform oil return oil path 202, a spring end of the fixed difference overflow valve 26 is connected with a platform load feedback oil path 203 of a platform control valve group 2, when an actuator in a platform execution unit 22 operates, and when the difference between the oil pressure of the platform oil inlet oil path 201 and the oil pressure of the platform load feedback oil path 203 is larger than a set value of the fixed difference overflow valve 26, the oil flow of the redundant platform oil inlet oil path 201 can be directly returned to the platform oil return oil path 202 through the fixed difference overflow valve 26, so that flow waste is further effectively reduced, and energy consumption is reduced.
As a preferred embodiment of the hydraulic control system for the aerial working platform of the present invention, referring to fig. 2, the main valve block 1 includes a platform pressure compensating valve 16, and the platform pressure compensating valve 16 is connected to the proportional solenoid valve 11 to be able to control the pressure difference of the oil input and output from the proportional solenoid valve 11 to be constant, so that the oil flow output from the proportional solenoid valve 11 is controlled only by the opening of the valve port of the proportional solenoid valve 11. In order to avoid that the oil pressure of the platform oil inlet passage 201 exceeds a safety value, a platform overflow valve 27 is provided between the platform oil inlet passage 201 and the platform oil return passage 202.
As a preferred implementation mode of the hydraulic control system of the aerial working platform, referring to FIG. 1, the oil supply element is a load sensitive variable plunger pump 5, a load feedback oil way of the chassis control valve group is connected with a load feedback oil port of the load sensitive variable plunger pump 5, and when the chassis is operated, the load sensitive variable plunger pump 5 adjusts the displacement according to the load pressure of the chassis control valve group, and the load feedback oil way is matched with the required flow of the chassis control valve group, so that the flow waste is avoided.
As a specific implementation mode of the hydraulic control system of the aerial working platform, referring to fig. 1, 4 and 5, the chassis control valve group comprises a front chassis control valve group 3, a rear chassis control valve group 4 and a chassis stop valve 6, wherein an oil inlet of the front chassis control valve group 3 and an oil inlet of the rear chassis control valve group 4 are connected with an output oil port of the load sensitive variable plunger pump 5 through the chassis stop valve 6 together, and load feedback oil paths of the front chassis control valve group 3 and the rear chassis control valve group 4 are connected with a load feedback oil port of the load sensitive variable plunger pump 5 together. The chassis stop valve 6 is added in the chassis action loop, so that when the front chassis control valve bank 3 or the rear chassis control valve bank 4 performs chassis action, the chassis mechanism stop valve 6 is required to be opened first, so that the load sensitive variable plunger pump 5 can supply oil to the front chassis control valve bank 3 or the rear chassis control valve bank 4, and the front chassis control valve bank 3 or the rear chassis control valve bank 4 controls the corresponding reversing valve to perform chassis action, so that each chassis action is controlled by two control valves, and the safety of the chassis action is ensured.
Specifically, referring to fig. 4, the front chassis control valve group 3 includes a front left steering cylinder 31, a front right steering cylinder 32, a front left telescopic cylinder 33, a front right telescopic cylinder 34, a front left steering reversing valve 35, a front right steering reversing valve 36, and a front leg telescopic reversing valve 37, the front left steering reversing valve 35 is connected to the front left steering cylinder 31, the front right steering reversing valve 36 is connected to the front right steering cylinder 32, the front left telescopic cylinder 33 and the front right telescopic cylinder 34 are commonly connected to the front leg telescopic reversing valve 37, the front chassis is controlled to perform front left steering, front right steering, or front leg telescopic actions by switching valve cores of the reversing valves, and the reversing valves are respectively provided with pressure compensating valves to ensure constant oil pressure difference of input and output of the reversing valves, the pressure compensating valves guide load pressure into a load feedback oil path of the front chassis control valve 3, the reversing valve is preferably controlled by electromagnetic, taking the front left steering action as an example, the chassis stop coil Y10 of the chassis stop valve 6 is powered on, the chassis stop valve 6 is opened, the first front left steering coil Y11 or the second front left steering coil Y12 of the front left steering reversing valve 35 is powered on, the front left steering cylinder 32 is retracted or extended, the load pressure of the front left steering action is transmitted to the load sensitive variable plunger pump 5 through the load feedback oil circuit of the front chassis control valve 4, the load sensitive variable plunger pump 5 outputs the flow of the front left steering requirement to the front chassis control valve group 3, the redundant flow is prevented from being input, the flow waste of the front left steering action is reduced, the energy consumption is reduced, and the working principle of the front right steering or front support leg telescopic action is the same as that of the front left steering action.
Referring to fig. 5, the rear chassis control valve group 4 includes a rear left steering cylinder 41, a rear right steering cylinder 42, a rear left telescopic cylinder 43, a rear right telescopic cylinder 44, a rear left steering reversing valve 45, a rear right steering reversing valve 46 and a rear leg telescopic reversing valve 47, the rear left steering reversing valve 35 is connected with the rear left steering cylinder 41, the rear right steering reversing valve 46 is connected with the rear right steering cylinder 42, the rear left telescopic cylinder 43 and the rear right telescopic cylinder 44 are jointly connected with the rear leg telescopic reversing valve 47, the rear chassis is controlled to perform rear left steering, rear right steering or rear leg telescopic actions by switching valve cores of the reversing valves, and the reversing valves are respectively provided with pressure compensating valves so as to ensure constant oil pressure difference of input and output of the reversing valves, the pressure compensating valves guide load pressure into a load feedback oil path of the rear chassis control valve 4, and the reversing valves preferably adopt electromagnetic control, and the rear chassis actions are the same as the working principle of the front chassis actions.
As a preferred embodiment of the hydraulic control system for the aerial working platform of the present invention, referring to fig. 1 and 2, the main valve block 1 includes a main valve oil inlet path 101, a main valve oil return path 102 and a main valve load feedback path 103, the main valve reversing valve and the proportional solenoid valve 11 can guide respective load pressures into the main valve load feedback path 103, the main valve load feedback path 103 is connected with a load feedback oil port of the load sensitive variable displacement plunger pump 5, and the load sensitive variable displacement plunger pump 5 can perform flow adjustment according to load feedback of the main valve block 1, so that flow waste is reduced.
Specifically, referring to fig. 2, the main valve executing unit 12 includes a luffing cylinder 121, a telescopic cylinder 122 and a rotary motor 123, the main valve group 1 includes a luffing directional valve 17 connected with the luffing cylinder 121, a telescopic directional valve 18 connected with the telescopic cylinder 122 and a rotary directional valve 19 connected with the rotary motor 123, the directional valves are respectively provided with pressure compensation valves so as to ensure that the oil pressure difference of the input and output of the directional valves is constant, and the pressure compensation valves and the platform pressure compensation valve 16 corresponding to each directional valve guide the load pressure into the main valve load feedback oil path 103 and then into the load feedback oil port of the load sensitive variable plunger pump 5.
Further preferably, a main valve unloading valve 13 is arranged between the main valve oil return oil path 102 and the load feedback oil path 103, the main valve unloading valve 13 is preferably electromagnetic controlled, when the main valve is in a standby state, a main valve unloading coil Y1 of the main valve unloading valve 13 is powered off, the main valve load feedback oil path 103 can release pressure to the main valve oil return oil path 102 through the main valve unloading valve 13, the displacement of the load sensitive variable plunger pump 5 is reduced, and the main valve is input into the main valve group 1 with small flow, so that flow waste is avoided; when the main valve is in a working state, the main valve unloading coil Y1 of the main valve unloading valve 13 is electrified, the main valve load feedback oil circuit 103 cannot unload through the main valve unloading valve 13, and the load pressure of the main valve group 1 can be led into the load feedback oil port of the load sensitive variable plunger pump 5, so that the load sensitive variable plunger pump 5 carries out flow regulation according to the load pressure of the main valve group 1.
As a preferred embodiment of the hydraulic control system for the aerial working platform, referring to fig. 2, a main valve overflow valve 14 is arranged between a main valve oil inlet oil path 101 and a main valve oil return oil path 102, and a main valve load feedback overflow valve 15 is arranged between a main valve load feedback oil path 103 and the main valve oil return oil path 102, so that the oil pressure of the main valve oil inlet oil path 101 and the oil pressure of the main valve load feedback oil path 103 are prevented from exceeding safety values, and the operation safety of the hydraulic system is ensured.
In order to facilitate understanding of the technical scheme of the hydraulic control system for the aerial working platform, the following description is made in connection with relatively preferred technical features.
Referring to fig. 1-5, the hydraulic control system of the aerial working platform of the invention connects the main valve group 1 and the chassis control valve group with the load sensitive variable plunger pump 5 respectively, so that the load sensitive variable plunger pump 5 can directly supply oil to the main valve group 1 and the chassis control valve group, and can regulate flow as required when the operation platform and the chassis are in single action, thereby avoiding flow waste, and the hydraulic control system is concretely as follows:
platform action loop
When in a standby working condition, the main valve unloading coil Y1 is electrified, the main valve unloading valve 13 is closed, the main valve platform flow coil Y2 inputs a first current value, the platform unloading coil Y3 is powered off, the platform unloading valve 21 is opened, so that the proportional control valve 11 supplies low-pressure low-flow oil to the platform control valve group 2, the platform works to be flushed with low-pressure low-flow, and the response time of the platform action can be ensured while the flow waste is reduced; when the single-action swinging working condition is adopted, the main valve unloading coil Y1 is powered on, the main valve unloading valve 13 is closed, the main valve platform flow coil Y2 is input with a second current value, the platform unloading coil Y3 is powered on, the platform unloading valve 21 is closed, the first swinging coil Y8 or the second swinging coil Y9 of the swinging reversing valve 25 is powered on, and the platform is controlled to swing leftwards or rightwards, so that the proportional control valve 11 supplies oil with smaller flow to the platform control valve group 2, and the platform action works with smaller flow; when the leveling or fly arm amplitude changing single action working condition is adopted, the main valve unloading coil Y1 is electrified, the main valve unloading valve 13 is closed, the main valve platform flow coil Y2 inputs a third current value, the platform unloading coil Y3 is electrified, the platform unloading valve 21 is closed, the first leveling coil Y4 or the second leveling coil Y5 of the leveling reversing valve 23 is electrified, the control platform is leveled downwards or upwards, or the first fly arm amplitude changing coil Y6 or the second fly arm amplitude changing coil Y7 of the fly arm amplitude changing valve 24 is electrified, the fly arm is controlled to amplitude downwards or upwards, so that the proportional control valve 11 supplies oil to the platform control valve group 2 with larger flow, and the platform action works with larger flow; when the leveling and flyer amplitude changing compound action working condition is adopted, the main valve unloading coil Y1 is powered on, the main valve unloading valve 13 is closed, the main valve platform flow coil Y2 inputs a fourth current value, the platform unloading coil Y3 is powered on, the platform unloading valve 21 is closed, the first leveling coil Y4 or the second leveling coil Y5 of the leveling reversing valve 23 is powered on, the platform is controlled to level downwards or upwards, meanwhile, the first flyer amplitude changing coil Y6 or the second flyer amplitude changing coil Y7 of the flyer amplitude changing valve 24 is controlled to power on, the flyer amplitude is controlled to change downwards or upwards, the proportional control valve 11 supplies oil to the platform control valve group 2 at the maximum flow, and the platform action works at the maximum flow. When the hydraulic control system of the aerial working platform disclosed by the invention performs platform action, the current value input by the flow coil Y2 of the main valve platform is regulated according to different action working conditions, and the input flow to the platform control valve group 2 is regulated as required, so that the flow waste is effectively reduced, and the energy consumption is reduced.
Chassis action loop
When the front left steering action is performed, the chassis stop coil Y10 is powered on, the chassis stop valve 6 is opened, the first front left steering coil Y11 or the second front left steering coil Y12 of the front left steering reversing valve 35 is powered on, the front left steering cylinder 32 is retracted or extended, the load pressure of the front left steering action is transmitted to the load sensitive variable plunger pump 5 through the load feedback oil path of the front chassis control valve 4, and the load sensitive variable plunger pump 5 outputs the flow of the front left steering requirement to the front chassis control valve group 3. The front right steering, front landing leg expansion and contraction, rear left steering, rear right steering and rear landing leg expansion and contraction loops are the same as the front left steering principle. The load feedback signals of the front chassis control valve group 3 and the rear chassis control valve group 4 are connected and fed back to the load sensitive variable plunger pump 5, so that the displacement of the load sensitive variable plunger pump 5 can be adjusted according to the load pressure, the required flow of the chassis control valve group is matched, the chassis stop valve 6 is added in a chassis action loop, each chassis action is controlled by two control valves, and the safety of the chassis action is ensured.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (10)
1. The utility model provides an aerial working platform hydraulic control system, its characterized in that includes main valves (1), platform control valves (2), chassis control valves and oil supply element, oil supply element connects respectively main valves (1) and chassis control valves are in order to supply oil, main valves (1) include proportional solenoid valve (11) and are used for connecting the main valve switching-over valve of main valve execution unit (12), proportional solenoid valve (11) are connected the oil inlet of platform control valves (2) in order to can supply oil, platform control valves (2) are including the platform switching-over valve that is used for connecting platform execution unit (22), platform execution unit (22) include a plurality of platform executor, platform switching-over valve is provided with a plurality of in order to connect each respectively the platform executor, proportional solenoid valve (11) are provided with main valve platform flow coil (Y2) of control valve opening, the current value of main valve platform flow coil (Y2) input can be adjusted according to the different action operating modes of platform executor, so as to control the main valve (11) input big or small-size of platform control unit (2), the output of the platform flow control valve (1) can be adjusted according to the big or small-size of the load.
2. The aerial work platform hydraulic control system according to claim 1, wherein the platform execution unit (22) comprises a leveling cylinder (221), a fly-arm amplitude cylinder (222) and a swing motor (223), the platform reversing valve comprises a leveling reversing valve (23) connected with the leveling cylinder (221), a fly-arm amplitude reversing valve (24) connected with the fly-arm amplitude cylinder (222) and a swing reversing valve (25) connected with the swing motor (223), the main valve platform flow coil (Y2) respectively inputs a first current value, a second current value, a third current value and a fourth current value according to the action condition of the platform execution unit (22), the first current value, the second current value, the third current value and the fourth current value sequentially control the valve opening of the proportional solenoid valve (11) to be larger from front to back, wherein,
when the platform executing unit (22) is in a standby working condition, the main valve platform flow coil (Y2) inputs the first current value;
when the swing motor (223) is in a single-action working condition, the main valve platform flow coil (Y2) inputs the second current value;
when the leveling oil cylinder (221) or the fly arm amplitude oil cylinder (222) is in a single-action working condition, the main valve platform flow coil (Y2) inputs the third current value;
when the leveling oil cylinder (221) and the fly arm amplitude oil cylinder (222) are in a compound action working condition, the flow coil (Y2) of the main valve platform inputs the fourth current value.
3. The aerial work platform hydraulic control system according to claim 2, wherein the platform control valve group (2) comprises a platform oil inlet oil path (201) and a platform oil return oil path (202), and a platform unloading valve (21) is arranged between the platform oil inlet oil path (201) and the platform oil return oil path (202).
4. A hydraulic control system for an aerial working platform according to claim 3, wherein a constant difference overflow valve (26) is arranged between the platform oil inlet oil path (201) and the platform oil return oil path (202), and a spring end of the constant difference overflow valve (26) is connected with a platform load feedback oil path (203) of the platform control valve group (2).
5. The hydraulic control system of the aerial working platform according to any one of claims 1 to 4, wherein the main valve group (1) includes a platform pressure compensating valve (16), and the platform pressure compensating valve (16) is connected to the proportional solenoid valve (11) so as to control the oil pressure difference of the input and output of the proportional solenoid valve (11) to be constant.
6. The aerial working platform hydraulic control system according to any one of claims 1-4, wherein the oil supply element is a load-sensitive variable displacement pump (5), and the load feedback oil paths of the main valve group (1) and the chassis control valve group are connected with a load feedback oil port of the load-sensitive variable displacement pump (5).
7. The hydraulic control system of the aerial working platform according to claim 6, wherein the chassis control valve group comprises a front chassis control valve group (3), a rear chassis control valve group (4) and a chassis stop valve (6), an oil inlet of the front chassis control valve group (3) and an oil inlet of the rear chassis control valve group (4) are connected with an output oil port of the load-sensitive variable plunger pump (5) through the chassis stop valve (6), and load feedback oil paths of the front chassis control valve group (3) and the rear chassis control valve group (4) are connected with a load feedback oil port of the load-sensitive variable plunger pump (5) together.
8. The aerial working platform hydraulic control system according to claim 6, wherein the main valve group (1) includes a main valve oil inlet oil path (101), a main valve oil return oil path (102) and a main valve load feedback oil path (103), the main valve reversing valve and the proportional solenoid valve (11) are capable of introducing respective load pressures into the main valve load feedback oil path (103), and the main valve load feedback oil path (103) is connected to a load feedback port of the load sensitive variable displacement plunger pump (5).
9. The aerial working platform hydraulic control system according to claim 8, wherein a main valve unloading valve (13) is provided between the main valve return oil passage (102) and the load feedback oil passage (103).
10. The aerial working platform hydraulic control system according to claim 8, wherein a main valve relief valve (14) is provided between the main valve oil inlet oil passage (101) and the main valve oil return oil passage (102), and a main valve load feedback relief valve (15) is provided between the main valve load feedback oil passage (103) and the main valve oil return oil passage (102).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211717538.5A CN116123161A (en) | 2022-12-29 | 2022-12-29 | Hydraulic control system for aerial working platform |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116892545A (en) * | 2023-09-11 | 2023-10-17 | 临工重机股份有限公司 | Control system of aerial work platform and aerial work platform |
| CN117090818A (en) * | 2023-10-17 | 2023-11-21 | 湖南星邦智能装备股份有限公司 | High-position forklift and hydraulic control system and method thereof |
-
2022
- 2022-12-29 CN CN202211717538.5A patent/CN116123161A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116892545A (en) * | 2023-09-11 | 2023-10-17 | 临工重机股份有限公司 | Control system of aerial work platform and aerial work platform |
| CN116892545B (en) * | 2023-09-11 | 2024-05-31 | 临工重机股份有限公司 | Control system of aerial work platform and aerial work platform |
| CN117090818A (en) * | 2023-10-17 | 2023-11-21 | 湖南星邦智能装备股份有限公司 | High-position forklift and hydraulic control system and method thereof |
| CN117090818B (en) * | 2023-10-17 | 2024-01-30 | 湖南星邦智能装备股份有限公司 | High-position forklift and hydraulic control system and method thereof |
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