CN106829815A - The arm support control system and aerial work platform of aerial work platform - Google Patents
The arm support control system and aerial work platform of aerial work platform Download PDFInfo
- Publication number
- CN106829815A CN106829815A CN201710186523.3A CN201710186523A CN106829815A CN 106829815 A CN106829815 A CN 106829815A CN 201710186523 A CN201710186523 A CN 201710186523A CN 106829815 A CN106829815 A CN 106829815A
- Authority
- CN
- China
- Prior art keywords
- valve
- control
- arm support
- oil
- oil cylinder
- 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
Classifications
-
- 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
- B66F11/044—Working platforms suspended from booms
- B66F11/046—Working platforms suspended from booms of the telescoping type
-
- 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
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more 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
- 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
-
- 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
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
-
- 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
- F15B2211/30—Directional control
- F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The invention discloses the arm support control system and aerial work platform of a kind of aerial work platform.Arm support control system includes main pump, emergency pump and for controlling the workbench of aerial work platform to carry out the leveling cyclinder of leveling, and arm support control system has normal control state and Emergency recovery state, and in normal control state, main pump is leveling cyclinder fuel feeding；In Emergency recovery state, emergency pump is leveling cyclinder fuel feeding.The arm support control system of aerial work platform of the invention is by being arranged under Emergency recovery state the emergency pump for leveling cyclinder fuel feeding so that workbench remains able to realize leveling when arm support control system of the invention is under Emergency recovery state.
Description
Technical field
The present invention relates to engineering machinery field, the arm support control system of more particularly to a kind of aerial work platform and high-altitude are made
Industry platform.
Background technology
Aerial work platform is that staff and equipment are transported into certain altitude to carry out the hoisting machinery of operation.Due to needing
Manned operation is wanted, therefore its processing safety, comfortableness and reliability requirement are far above other general hoisting machineries.
The aerial work platform of workbench lifting is driven by two kinds by jib structure, one kind is crank arm type work high above the ground
Platform, one kind is straight arm type aerial work platform.Wherein, the structure of straight arm type aerial work platform is as shown in Figure 1.Straight arm type is high
Working platform includes turntable 1, basic arm 4, two joint arms 5, amplitude oil cylinder 2, telescopic oil cylinder 3, workbench 7 and leveling cyclinder 6.
Amplitude oil cylinder 2 drives luffing range of cantilever support.Telescopic oil cylinder 3 drives the flexible of arm support.Leveling cyclinder 6 is used for the angle of adjustment work platform 7
Degree makes it keep basic horizontal.In order to ensure the safety and comfortableness of staff, the leveling performance of workbench is to weigh high
One important indicator of the performance of working platform.
The levelling principle of workbench 7 will be as shown in Fig. 2 when arm support carries out luffing, the bottom surface of workbench 7 will no longer be protected
Water holding is put down, the inclination angle of the bottom surface of the collecting work platform 7 of the obliquity sensor 8 and dip angle signal that will be detected is sent to controller
15.Controller 15 drives leveling reversal valve 9 to act according to the dip angle signal for receiving makes the piston rod of leveling cyclinder 6 stretch out or contract
Return, so as to directly drive rotation or backspin on workbench 7, realize the leveling of workbench 7.
When staff during operation on workbench 7 in case of emergency, for example, engine or main oil pump
Break down, it is impossible to for system provides power.Emergency operation is now needed, by the gravity of arm support itself by aerial work platform
Arm support withdraw so that worker safety reach ground, prevent danger.
Arm support control system of the prior art is as shown in Figure 3.Arm support control system include main pump 10, main control valve 11,
Leveling reversal valve 9, luffing balanced valve 12, flexible balanced valve 13 and leveling balanced valve 14.Main pump 10 is controlled by main control valve 11
Amplitude oil cylinder 2 and telescopic oil cylinder 3 are acted and for leveling cyclinder 6 provides fluid.
The following detailed description of arm support control system of the prior art in normal control state and Emergency recovery state
Specific work process.
In the normal control state, in the first solenoid directional control valve 121 and flexible balanced valve 13 in luffing balanced valve 12
Second solenoid directional control valve 131 must not be electric, is operated in spring position.Main pump 10 is load sensitive pump, is used herein as constant pressure pump.When
When 3rd solenoid directional control valve 111 must not be electric, LS mouthfuls of pressure is zero, and main pump 10 is operated in armed state, and P mouthfuls of pressure is standby pressure
(about 2MPa).When the 3rd solenoid directional control valve 111 obtains electric, main pump 10 is operated in pressure constant state, and P mouthfuls of pressure is 21MPa.Overflow
Valve 112 shields.Now, luffing proportioning valve 113 obtains electric, the left position of luffing reversal valve 114 or right position obtains electric, is capable of achieving arm support
Luffing；Scaling valve 115 obtains electric, the flexible left position of reversal valve 116 or right position obtains electric, is capable of achieving boom frame telescopic.Simultaneously by control
Leveling reversal valve 9 processed can realize automatic leveling of the workbench in arm support action process.
Under Emergency recovery state, the first solenoid directional control valve 121 of luffing balanced valve 12 obtains electric so that it is operated in work
Make position, the rodless cavity of amplitude oil cylinder 2 is connected with fuel tank, luffing range of cantilever support falls under gravity.The second of flexible balanced valve 13
Solenoid directional control valve 131 it is electric so that it is operated in working position, the rodless cavity of telescopic oil cylinder 3 is connected with fuel tank, in Action of Gravity Field
Lower arm support is retracted, so as to realize the urgent recovery of arm support.But no longer it is leveling cyclinder 6 due to main pump 10 under emergent operating mode
Power is provided, therefore when luffing range of cantilever support falls, workbench can significantly incline and cannot automatic leveling, therefore influence work is flat
The safety of the staff on platform.
In addition, operating personnel Emergency recovery state lower control arm frame luffing fall and retract when, it is necessary to operate high-altitude to make
Two buttons on the guidance panel of industry platform, control the first solenoid directional control valve 121 and the second solenoid directional control valve 131 to obtain respectively
Electricity, two hands are needed during operation, and coordinated manipulation could realize arm support one side luffing whereabouts while retracting simultaneously, therefore complex operation.And
Arm support is during luffing falls and retracts, and luffing range of cantilever support and the speed retracted are uncontrollable.
The content of the invention
It is an object of the invention to provide the arm support control system and aerial work platform of a kind of aerial work platform, so that
The workbench of aerial work platform can realize leveling under Emergency recovery state.
First aspect present invention provides a kind of arm support control system of aerial work platform to be included main pump, emergency pump and is used for
The workbench of control aerial work platform carries out the leveling cyclinder of leveling, and arm support control system has normal control state and answers
Anxious to reclaim state, in normal control state, main pump is leveling cyclinder fuel feeding；In Emergency recovery state, emergency pump is leveling cyclinder
Fuel feeding.
Further, arm support control system also includes amplitude oil cylinder, telescopic oil cylinder, control valve group and emergent oil return line, becomes
Width oil cylinder has the first working chamber and the second working chamber, drives arm support to fall during the first working chamber oil-feed of amplitude oil cylinder, luffing
Arm support is driven to rise during the second working chamber oil-feed of oil cylinder；Telescopic oil cylinder has the first working chamber and the second working chamber, and stretch oil
Drive arm support to retract during the first working chamber oil-feed of cylinder, drive arm support to stretch out during the second working chamber oil-feed of telescopic oil cylinder；It is emergent
Oil return line is connected with the second working chamber of amplitude oil cylinder and the first working chamber of telescopic oil cylinder respectively；Wherein, in normal control shape
State, the emergent oil return line of control valve group control is disconnected so that amplitude oil cylinder and the normal oil return of telescopic oil cylinder；In Emergency recovery state, control
Second working chamber of valve group control amplitude oil cylinder processed is connected to control with the first working chamber of telescopic oil cylinder by emergent oil return line
Arm support is retracted while falling.
Further, control valve group includes flexible reversal valve for controlling telescopic oil cylinder flexible and is arranged at emergent oil return
On road and for controlling the first on-off valve of emergent oil return line break-make, oil return line of meeting an urgent need to connect by flexible reversal valve and telescopic oil cylinder
Connect, in normal control state, the emergent oil return line of the first on-off valve control disconnects causing that amplitude oil cylinder and telescopic oil cylinder are normally returned
Oil；In Emergency recovery state, the emergent oil return line of the first on-off valve control is connected and the reversal valve that stretches controls emergent oil return line and stretches
The first working chamber connection of contracting oil cylinder is connected with the second working chamber for causing amplitude oil cylinder with the first working chamber of telescopic oil cylinder.
Further, the first on-off valve includes the first hydraulic fluid port and the second hydraulic fluid port and with Stress control end, the first on-off valve
The first hydraulic fluid port be connected with the second working chamber of amplitude oil cylinder, the second hydraulic fluid port of the first on-off valve and the oil inlet of flexible reversal valve
Connection, the first on-off valve is according to the hydraulic fluid port of Stress control first at Stress control end and the break-make of the second hydraulic fluid port.
Further, in Emergency recovery state, the pump discharge of emergency pump is connected with control pressure control with Stress control end
The pressure at end.
Further, control valve group includes the second break-make being arranged between the pump discharge of emergency pump and Stress control end
Valve, in normal control state, the pump discharge of the second on-off valve control emergency pump disconnects with Stress control end；In Emergency recovery shape
State, the pump discharge of the second on-off valve control emergency pump is connected with Stress control end.
Further, the first on-off valve includes hydraulic control one-way valve, and the oil inlet of hydraulic control one-way valve enters with flexible reversal valve
Hydraulic fluid port is connected, and the oil-out of hydraulic control one-way valve is connected with the second working chamber of amplitude oil cylinder.
Further, control valve group is also included located at the check valve between the first on-off valve and flexible reversal valve, check valve
Oil inlet be connected with the first on-off valve, the oil-out of check valve is connected with flexible reversal valve.
Further, control valve group also includes the restricting element contacted with the first on-off valve.
Further, emergent oil return line is also connected with oil extraction, and control valve group also includes row's oil control valve, and row's oil control valve is used
In controlled under Emergency recovery state emergent oil return line selectively with the first working chamber of telescopic oil cylinder and oil extraction in one
Connection.
Further, arm support control system also include sensor, sensor be used for detect arm support retracted mode and with row
Oil control valve is coupled, the retracted mode control oil extraction control valve events of the arm support that row's oil control valve is detected according to sensor.
Second aspect present invention provides a kind of aerial work platform, including the high-altitude that any one of first aspect present invention is provided
The arm support control system of job platform.
The arm support control system and aerial work platform of the aerial work platform provided based on the present invention, arm support control system
Including main pump, emergency pump and for controlling the workbench of aerial work platform to carry out the leveling cyclinder of leveling, arm support control system
System has normal control state and Emergency recovery state, and in normal control state, main pump is leveling cyclinder fuel feeding；In Emergency recovery
State, emergency pump is leveling cyclinder fuel feeding.The arm support control system of aerial work platform of the invention is met an urgent need back by being arranged on
Worked when causing that arm support control system of the invention is under Emergency recovery state for the emergency pump of leveling cyclinder fuel feeding under receipts state
Platform remains able to realize leveling.So as to beneficial to the safety for ensureing staff on workbench under Emergency recovery state and
Comfort level.
By referring to the drawings to the detailed description of exemplary embodiment of the invention, further feature of the invention and its
Advantage will be made apparent from.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair
Bright schematic description and description does not constitute inappropriate limitation of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the structural representation of aerial work platform；
Fig. 2 is the levelling principle structural representation of the workbench in Fig. 1；
Fig. 3 is the structural representation of arm support control system of the prior art；
Fig. 4 is the structural representation of the arm support control system of the embodiment of the present invention；
Fig. 5 is the concrete structure schematic diagram of the main control valve in Fig. 4；
Fig. 6 is the concrete structure schematic diagram of the luffing balanced valve in Fig. 4.
Each reference is represented respectively：
1- turntables；2- amplitude oil cylinders；3- telescopic oil cylinders；4- basic arms；The joint arms of 5- bis-；6- leveling cyclinders；7- workbenches；
8- obliquity sensors；9- leveling reversal valves；10- main pumps；11- main control valves；The solenoid directional control valves of 111- the 3rd；112- overflow valves；
113- luffing proportioning valves；114- luffing reversal valves；115- scaling valves；116- stretches reversal valve；12- luffing balanced valves；
The solenoid directional control valves of 121- first；13- stretches balanced valve；The solenoid directional control valves of 131- second；14- leveling balanced valves；15- controllers；
20- main pumps；21- main control valves；211- solenoid directional control valves；212- overflow valves；213- luffing proportioning valves；214- luffing reversal valves；
215- scaling valves；216- stretches reversal valve；217- solenoid directional control valves；218- arranges oil control valve；The fluid-control one-ways of 219- second
Valve；210- check valves；22- luffing balanced valves；The hydraulic control one-way valves of 221- first；222- choke valves；23- stretches balanced valve；24- is adjusted
Flat balanced valve；29- leveling reversal valves；30- emergency pumps；32- amplitude oil cylinders；33- telescopic oil cylinders；34- leveling cyclinders.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Below
Description only actually at least one exemplary embodiment is illustrative, and never conduct is to the present invention and its application or makes
Any limitation.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, belongs to the scope of protection of the invention.
Unless specifically stated otherwise, the part and positioned opposite, the digital table of step for otherwise illustrating in these embodiments
Do not limited the scope of the invention up to formula and numerical value.Simultaneously, it should be appreciated that for the ease of description, each portion shown in accompanying drawing
The size divided not is to be drawn according to actual proportionate relationship.For technology, side known to person of ordinary skill in the relevant
Method and equipment may be not discussed in detail, but in the appropriate case, the technology, method and apparatus should be considered as authorizing explanation
A part for book.In all examples shown here and discussion, any occurrence should be construed as merely exemplary, and
Not by way of limitation.Therefore, the other examples of exemplary embodiment can have different values.It should be noted that：Similar label
Similar terms is represented in following accompanying drawing with letter, therefore, once be defined in a certain Xiang Yi accompanying drawing, then subsequent attached
It need not be further discussed in figure.
For the ease of description, space relative terms can be used herein, such as " ... on ", " ... top ",
" in ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy
The spatial relation levied.It should be appreciated that space relative terms are intended to comprising the orientation except device described in figure
Outside different azimuth in use or operation.If for example, the device in accompanying drawing is squeezed, be described as " in other devices
To be positioned as " under other devices or construction after the device of part or construction top " or " on other devices or construction "
Side " or " under other devices or construction ".Thus, exemplary term " ... top " can include " ... top " and
" in ... lower section " two kinds of orientation.The device can also other different modes positioning (being rotated by 90 ° or in other orientation), and
And respective explanations are made to the relative description in space used herein above.
As shown in figure 4, the arm support control system of the aerial work platform of the embodiment of the present invention includes main pump 20, emergency pump 30
With the leveling cyclinder 34 that the workbench for controlling aerial work platform carries out leveling.Arm support control system has normal control
State and Emergency recovery state.In normal control state, main pump 20 is the fuel feeding of leveling cyclinder 34；In Emergency recovery state, meet an urgent need
Pump 30 is the fuel feeding of leveling cyclinder 34.The arm support control system of the aerial work platform of the embodiment of the present invention is met an urgent need back by being arranged on
For the emergency pump 30 of leveling cyclinder fuel feeding causes the arm support control system of the embodiment of the present invention in Emergency recovery state under receipts state
Workbench will remain able to realize leveling when lower.So as to be beneficial to ensure the staff on workbench under Emergency recovery state
Safety and comfort level.
The concrete structure of the arm support control system of a specific embodiment of the invention will be carried out in detail according to Fig. 4 to Fig. 6 below
Describe in detail bright.
The arm support control system of the present embodiment includes main pump 20, emergency pump 30, leveling cyclinder 34 and control valve group.Control valve
Group includes main control valve 21, leveling balanced valve 24 and leveling reversal valve 24.
Wherein, main control valve 21 has the main hydraulic fluid port P1 being connected with main pump 20 and the emergent hydraulic fluid port being connected with emergency pump 30
P2.In the normal control state, the fluid of main pump 20 is entered in main control valve 21 by main hydraulic fluid port P1 and is by leveling hydraulic fluid port H
The fuel feeding of leveling cyclinder 34.Under Emergency recovery state, the fluid of emergency pump 30 by emergent hydraulic fluid port P2 enter main control valve 21 and
Leveling hydraulic fluid port H is reached by solenoid directional control valve 211 and thinks the fuel feeding of leveling cyclinder 34.The oil inlet of leveling reversal valve 29 and leveling oil
Mouth H connections, the first oil-out of leveling reversal valve 29 is connected with the rodless cavity of leveling cyclinder, and the second of leveling reversal valve 29 is fuel-displaced
Mouthful be connected with the rod chamber of leveling cyclinder, the control of leveling reversal valve 29 its oil inlet selectively with its first oil-out and Qi
One in two oil-outs connects so that the fluid of emergency pump 30 enters the rodless cavity or rod chamber of leveling cyclinder to control work
The leveling of platform.
As shown in figure 4, the arm support control system of the present embodiment also includes amplitude oil cylinder 32 and telescopic oil cylinder 33.Control valve group
Also include luffing balanced valve 22 and flexible balanced valve 23.Main control valve 21 includes the change amplitude ratio for controlling amplitude oil cylinder 32 to act
Example valve 213 and luffing reversal valve 214 and scaling valve 215 and flexible reversal valve for controlling telescopic oil cylinder 33 to act
216.Amplitude oil cylinder 32 has the first working chamber (rodless cavity) and the second working chamber (rod chamber), and the rodless cavity of amplitude oil cylinder 32 enters
Drive arm support to fall when oily, drive arm support to rise during the rod chamber oil-feed of amplitude oil cylinder 32.Telescopic oil cylinder 33 have rodless cavity and
Rod chamber.Drive arm support to retract during the rodless cavity oil-feed of telescopic oil cylinder 33, arm support is driven during the rod chamber oil-feed of telescopic oil cylinder 33
Stretch out.
In the normal control state, the fluid of main pump 20 enters main control valve 21 and passes through luffing ratio by main hydraulic fluid port P1
Valve 213 is connected with the oil inlet of luffing reversal valve 214.First oil-out of luffing reversal valve 214 and the first of main control valve 21
Luffing hydraulic fluid port M1 is connected, and the second oil-out of luffing reversal valve 214 is connected with the second luffing hydraulic fluid port M2 of main control valve 21.And the
One luffing hydraulic fluid port M1 is connected with the rodless cavity of amplitude oil cylinder 32, and the second luffing hydraulic fluid port M2 is connected with the rod chamber of amplitude oil cylinder 32.
Luffing reversal valve 214 controls its oil inlet selectively to connect to control with its first oil-out and its second oil-out
The fluid of main pump processed 20 enters the rod chamber or rodless cavity of amplitude oil cylinder 32 to control arm support to rise or fall.Similarly, main pump
20 fluid is connected by scaling valve 215 after entering main control valve 21 with the oil inlet of flexible reversal valve 216.Flexible commutation
First oil-out of valve 216 hydraulic fluid port N1 flexible with the first of main control valve be connected, the second oil-out of flexible reversal valve 216 and master
Second flexible hydraulic fluid port N2 connections of control valve.And first flexible hydraulic fluid port N1 be connected with the rodless cavity of telescopic oil cylinder 33, second is flexible
Hydraulic fluid port N2 is connected with the rod chamber of telescopic oil cylinder 33.Flexible reversal valve 216 controls its oil inlet selectively first fuel-displaced with it
Mouth connects the rodless cavity or rod chamber to control the fluid of main pump 20 to enter telescopic oil cylinder 33 with its second oil-out
To control arm support to stretch out or retract.
Preferably, the arm support control system of the present embodiment also includes emergent oil return line.Emergent oil return line is oily with luffing respectively
The rod chamber connection of the rodless cavity and telescopic oil cylinder 33 of cylinder 32.
In normal control state, the emergent oil return line of control valve group control disconnect so that amplitude oil cylinder 32 and telescopic oil cylinder 33 just
Normal oil return.In Emergency recovery state, the rodless cavity of control valve group control amplitude oil cylinder 32 passes through with the rod chamber of telescopic oil cylinder 33
Emergent oil return line connection is retracted with controlling arm support while whereabouts.The arm support control system of the present embodiment is in Emergency recovery state
The rodless cavity of lower amplitude oil cylinder is connected by emergent oil return line with the rod chamber of telescopic oil cylinder, thus when arm support under gravity
Arm support can be simultaneously driven to retract automatically during automatic whereabouts.
In order on the basis of ensureing that arm support control system can realize luffing range of cantilever support and stretch in the normal control state
The whereabouts of arm support can also be realized under Emergency recovery state and is retracted while carrying out, the control valve group of the present embodiment includes being arranged at
On emergent oil return line and for controlling the first on-off valve of emergent oil return line break-make.Emergent oil return line is by the reversal valve 216 that stretches
It is connected with telescopic oil cylinder 33.In normal control state, the emergent oil return line of the first on-off valve control disconnects causing amplitude oil cylinder 32
With the normal oil return of telescopic oil cylinder 33.In Emergency recovery state, the emergent oil return line of the first on-off valve control is connected and the reversal valve that stretches
The emergent oil return line of 216 controls connects to cause the rodless cavity and telescopic oil cylinder 33 of amplitude oil cylinder 32 with the rod chamber of telescopic oil cylinder 33
Rod chamber connection.For operating personnel, as long as one the first on-off valve of control just can be real under Emergency recovery state
The whereabouts of existing arm support is carried out simultaneously with retraction, compared with prior art, without right-hand man's coordinated manipulation, therefore side simple to operate
Just.One control button can be only set on the guidance panel of the aerial work platform of the present embodiment.Control button control electricity
Magnetic reversal valve 217, flexible reversal valve 216 left position whether it is electric, while emergency pump operation simultaneously, you can under realizing luffing range of cantilever support
Fall and retract while carry out, thus it is simple to operate and efficient.
Preferably, the first on-off valve is pressure on-off valve, that is to say, that including the first hydraulic fluid port and the second hydraulic fluid port and with pressure
Power control end.First hydraulic fluid port of the first on-off valve is connected with the rodless cavity of amplitude oil cylinder 32, the second hydraulic fluid port of the first on-off valve with
The oil inlet connection of flexible reversal valve 216.First on-off valve is according to the hydraulic fluid port of Stress control first at Stress control end and the second oil
The break-make of mouth.In normal control state, the first on-off valve controls the first hydraulic fluid port and the second hydraulic fluid port to disconnect so that emergent oil return line breaks
Open；In Emergency recovery state, the first on-off valve controls the first hydraulic fluid port to be connected with the second hydraulic fluid port and the reversal valve that stretches controls flexible changing
Connected with the rod chamber of telescopic oil cylinder to the oil inlet of valve.
Specifically, in the present embodiment, the first on-off valve is the first hydraulic control one-way valve 221.First hydraulic control one-way valve 221
Oil inlet is connected with the oil inlet of flexible reversal valve 216, and the oil-out of the first hydraulic control one-way valve 221 is with amplitude oil cylinder 32 without bar
Chamber connects.And the Stress control end C of the first hydraulic control one-way valve 221 is connected with the pump discharge of emergency pump 30.In normal control shape
Under state, state of first hydraulic control one-way valve 221 in positive circulation, now to prevent the fluid of scaling valve 215 by the
One hydraulic control one-way valve 221 influences the normal luffing of arm support, as shown in Figure 4 and Figure 5, this reality into the rodless cavity of amplitude oil cylinder 32
The main control valve 21 for applying example also includes check valve 210.The oil inlet of the oil inlet of check valve 210 and the first hydraulic control one-way valve 221
Connection, the oil-out of check valve 210 is connected with the oil inlet of luffing reversal valve 216.Therefore, in the normal control state, luffing
Oil cylinder 32 and telescopic oil cylinder 33 can carry out oil return to realize the luffing of arm support and stretch.Under Emergency recovery state, emergency pump
30 pump discharge is connected with the Stress control end of the first hydraulic control one-way valve 221, now the reverse circulated of the first hydraulic control one-way valve 221,
The fluid of the rodless cavity of amplitude oil cylinder 32 enters flexible reversal valve 216 by the first hydraulic control one-way valve 221 and check valve 210.
Flexible reversal valve 216 controls its oil inlet to be connected with the rod chamber of telescopic oil cylinder with so that the fluid of the rodless cavity of amplitude oil cylinder enters
The rod chamber for entering telescopic oil cylinder is realized the whereabouts of arm support and is retracted while carrying out.The arm support control system of the present embodiment is by answering
First hydraulic control one-way valve 221 is set on anxious oil return line and controls the first hydraulic control one-way valve 221 to act by emergency pump 30, make
It is that the emergency pump for realizing emergent levelling function can also realize the whereabouts of arm support with retraction while carrying out to obtain the present embodiment, realizes one
Thing is multiplex, simplifies the structure of arm support control system.In addition, the arm support control system of the present embodiment selects universal component fluid-control one-way
Valve controls the break-make of emergent oil return line, cost-effective.
Preferably, be integrated in the first hydraulic control one-way valve 221 in luffing balanced valve 22 by the present embodiment, therefore is normally controlling
During state, a bit of pipeline only between the rodless cavity of amplitude oil cylinder 32 and luffing balanced valve 22 bears the pressure of fluid, from
And reduce to the pressure bearing requirement of remaining section of pipeline on oil return line of meeting an urgent need with reduces cost.
It is the reliability for preventing the failure of the first hydraulic control one-way valve 221 to improve the arm support control system of the present embodiment, such as
Shown in Fig. 4 and Fig. 5, the arm support control system of the present embodiment is integrally disposed with the first hydraulic control one-way valve in main control valve 21
221 series connection and the second hydraulic control one-way valve 219 for setting in the same direction.And second hydraulic control one-way valve 219 Stress control end also with it is emergent
The pump discharge connection of pump 30.Therefore, emergency pump 30 can simultaneously control the first hydraulic control one-way valve 221 and the second hydraulic control one-way valve
219 reverse circulateds.
Preferably, the main control valve 21 of the present embodiment includes being arranged at the pump discharge and the first hydraulic control one-way valve of emergency pump 30
The second on-off valve between 221 Stress control end.In normal control state, the pump discharge of the second on-off valve control emergency pump with
Stress control end disconnects.In Emergency recovery state, the pump discharge of the second on-off valve control emergency pump is connected with Stress control end.
As shown in figure 5, second on-off valve of the present embodiment is solenoid directional control valve 217.Solenoid directional control valve 217 includes and meets an urgent need
First hydraulic fluid port of the pump discharge connection of pump 30 and second hydraulic fluid port and oil discharge outlet and with the first working position of the connection of Stress control end
With the second working position.In the first working position, the first hydraulic fluid port of solenoid directional control valve 217 ends, the second hydraulic fluid port of solenoid directional control valve 217
Connected with oil discharge outlet.In the second working position, the first hydraulic fluid port of solenoid directional control valve 217 is connected with the second hydraulic fluid port, oil discharge outlet cut-off.Its
In, in normal control state, the second on-off valve is in the first working position, and in Emergency recovery state, the second on-off valve is in second
Working position.
Preferably, the emergent oil return line of the present embodiment is also connected with oil extraction.Emergent oil return line also includes row's oil control valve
218.Row's oil control valve 218 be used to being controlled under Emergency recovery state emergent oil return line selectively with the first work of telescopic oil cylinder
Make chamber to be connected with oil extraction.The first end of emergent oil return line is connected with the rodless cavity of amplitude oil cylinder 32, oil return line of meeting an urgent need
The second end be connected with the oil inlet of flexible reversal valve 216 and oil extraction.When arm support is not retracted into bottom, row's oil control valve 218 is controlled
The emergent oil return line of system disconnects with oil extraction, and now, the fluid of the rodless cavity of amplitude oil cylinder 32 makes into the rod chamber of telescopic oil cylinder 33
The whereabouts of arm support is carried out simultaneously with retraction.When arm support is retracted into bottom, the emergent oil return line of row's control of oil control valve 218 connects with oil extraction
Logical, now, the fluid of the rodless cavity of amplitude oil cylinder 32 is vented directly to fuel tank.
In order to detect the retracted mode of arm support with the action of the row's of control oil control valve 218, the arm support control system of the present embodiment
System also includes sensor.Sensor is used to detect the retracted mode of arm support and is coupled with row's oil control valve 218, arranges oil control valve
The retracted mode control oil extraction control valve events of 218 arm supports detected according to sensor.
For the speed for controlling arm support to fall and retract, the control valve group of the present embodiment also includes being contacted with the first on-off valve
Restricting element.
As shown in fig. 6, specifically in the present embodiment, restricting element is the choke valve 222 being arranged in luffing balanced valve 22.
Because the arm support control system of the present embodiment is when in Emergency recovery state, rodless cavity and the telescopic oil cylinder of its amplitude oil cylinder
Rod chamber is connected, therefore the setting of choke valve 222 causes that arm support falls and the speed of retraction is controllable.
The course of work of the arm support control system of the present embodiment is as follows：
In normal control state, solenoid directional control valve 217 and row's oil control valve 218 must not be electric, are operated in spring position, become
The rodless cavity of width oil cylinder 32 cannot be by emergent oil return line off-load, therefore amplitude oil cylinder 32 and the normal oil return of telescopic oil cylinder 33.
In Emergency recovery state, solenoid directional control valve 217 obtains electric, and row's oil control valve 218 must not electricity.Flexible reversal valve 216 is left
Position obtains electric.The fluid of the pump discharge of emergency pump 30 is through solenoid directional control valve 217 by the first hydraulic control one-way valve 221 and the second fluid-control one-way
Valve 219 is opened, and the fluid of the rodless cavity of amplitude oil cylinder 32 is through choke valve 222, the first hydraulic control one-way valve 221, the second fluid-control one-way
Valve 219, check valve 210 and flexible reversal valve 216 reach the rod chamber of telescopic oil cylinder 33, while opening the nothing of flexible balanced valve 23
The overflow valve of rod cavity side, so as to the luffing for realizing arm support falling to retracted while carrying out with arm support.
When sensor detection arm support is retracted into bottom, row's oil control valve 218 obtains electric.The fluid of the rodless cavity of amplitude oil cylinder 32
It is direct through choke valve 222, the first hydraulic control one-way valve 221, the second hydraulic control one-way valve 219, check valve 210 and row's oil control valve 218
Fuel tank is flowed back to, luffing whereabouts is continued until state of returning the vehicle to the garage and knock off so as to realize that arm support is retracted into behind bottom.
The arm support control system of the embodiment of the present invention can also be applied to straight arm type and disappear in addition to aerial work platform is applied to
On anti-car.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention rather than its limitations；To the greatest extent
Pipe has been described in detail with reference to preferred embodiment to the present invention, and those of ordinary skill in the art should be understood：Still
Specific embodiment of the invention can be modified or equivalent is carried out to some technical characteristics；Without deviating from this hair
The spirit of bright technical scheme, it all should cover in the middle of claimed technical scheme scope of the invention.
Claims (12)
1. a kind of arm support control system of aerial work platform, it is characterised in that including：Main pump (20), emergency pump (30) and use
The leveling cyclinder (34) of leveling is carried out in the workbench of the control aerial work platform, the arm support control system has just
Normal state of a control and Emergency recovery state, in the normal control state, the main pump (20) supplies for the leveling cyclinder (34)
Oil；In the Emergency recovery state, the emergency pump (30) is the leveling cyclinder (34) fuel feeding.
2. the arm support control system of aerial work platform according to claim 1, it is characterised in that the arm support control system
System also includes amplitude oil cylinder (32), telescopic oil cylinder (33), control valve group and emergent oil return line, and the amplitude oil cylinder (32) is with the
One working chamber and the second working chamber, drive the arm support to fall during the first working chamber oil-feed of the amplitude oil cylinder (32), described
The arm support is driven to rise during the second working chamber oil-feed of amplitude oil cylinder (32)；The telescopic oil cylinder (33) is with the first working chamber
With the second working chamber, the arm support is driven to retract during the first working chamber oil-feed of the telescopic oil cylinder (33), the telescopic oil cylinder
(33) arm support is driven to stretch out during the second working chamber oil-feed；The emergent oil return line respectively with the amplitude oil cylinder (32)
The first working chamber connection of the second working chamber and the telescopic oil cylinder (33)；Wherein, in the normal control state, the control
The valve group control emergent oil return line is disconnected so that the amplitude oil cylinder and the normal oil return of the telescopic oil cylinder；Met an urgent need back described
Receipts state, the control valve group controls the second working chamber of the amplitude oil cylinder (32) and the first work of the telescopic oil cylinder (33)
Make chamber to connect to control the arm support to be retracted while falling by the emergent oil return line.
3. the arm support control system of aerial work platform according to claim 2, it is characterised in that the control valve group bag
Include the flexible reversal valve (216) for controlling the telescopic oil cylinder flexible and be arranged on the emergent oil return line and for controlling
First on-off valve of the emergent oil return line break-make, the emergent oil return line is stretched by the flexible reversal valve (216) with described
Contracting oil cylinder (33) is connected, and in the normal control state, the first on-off valve control emergent oil return line disconnects causing
The amplitude oil cylinder (32) and the normal oil return of the telescopic oil cylinder (33)；In the Emergency recovery state, first on-off valve
Control the emergent oil return line connection and the flexible reversal valve (216) controls the emergent oil return line and the telescopic oil cylinder
(33) the first working chamber connection is causing the of the second working chamber and the telescopic oil cylinder (33) of the amplitude oil cylinder (32)
One working chamber is connected.
4. the arm support control system of aerial work platform according to claim 3, it is characterised in that first on-off valve
Including the first hydraulic fluid port and the second hydraulic fluid port and with Stress control end, the first hydraulic fluid port and the amplitude oil cylinder of first on-off valve
(32) the second working chamber connection, the second hydraulic fluid port of first on-off valve connects with the oil inlet of the flexible reversal valve (216)
Connect, the break-make of first on-off valve the first hydraulic fluid port and second hydraulic fluid port according to the Stress control at the Stress control end.
5. the arm support control system of aerial work platform according to claim 4, it is characterised in that in the Emergency recovery
State, the pump discharge of the emergency pump (30) is connected to control the pressure at the Stress control end with the Stress control end.
6. the arm support control system of aerial work platform according to claim 5, it is characterised in that the control valve group bag
The second on-off valve being arranged between the pump discharge of the emergency pump (30) and the Stress control end is included, in the normal control
State, second on-off valve controls the pump discharge of the emergency pump (30) to be disconnected with the Stress control end；Described emergent
Recovery state, second on-off valve controls the pump discharge of the emergency pump (30) to be connected with the Stress control end.
7. the arm support control system of aerial work platform according to claim 4, it is characterised in that first on-off valve
Including hydraulic control one-way valve, the oil inlet of the hydraulic control one-way valve is connected with the oil inlet of the flexible reversal valve, the hydraulic control list
It is connected with the second working chamber of the amplitude oil cylinder to the oil-out of valve.
8. the arm support control system of aerial work platform according to claim 3, it is characterised in that the control valve group is also
Including the check valve between first on-off valve and the flexible reversal valve, the oil inlet of the check valve and described
One on-off valve is connected, and the oil-out of the check valve is connected with the flexible reversal valve.
9. the arm support control system of aerial work platform according to claim 3, it is characterised in that the control valve group is also
Including the restricting element contacted with first on-off valve.
10. the arm support control system of aerial work platform according to claim 2, it is characterised in that the emergent oil return
Road is also connected with oil extraction, and the control valve group also includes row's oil control valve (218), and row's oil control valve (218) is in institute
State control under Emergency recovery state the emergent oil return line selectively with the first working chamber of the telescopic oil cylinder and oil extraction in
One connection.
The arm support control system of 11. aerial work platforms according to claim 10, it is characterised in that the arm support control
System also include sensor, the sensor be used for detect the arm support retracted mode and with row's oil control valve (218)
Coupling, the retracted mode of the arm support that row's oil control valve (218) is detected according to the sensor controls the oil extraction control
Valve (218) action processed.
12. a kind of aerial work platforms, it is characterised in that including the work high above the ground as any one of claim 1 to 11
The arm support control system of platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710186523.3A CN106829815B (en) | 2017-03-27 | 2017-03-27 | Arm support control system of aerial work platform and aerial work platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710186523.3A CN106829815B (en) | 2017-03-27 | 2017-03-27 | Arm support control system of aerial work platform and aerial work platform |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106829815A true CN106829815A (en) | 2017-06-13 |
| CN106829815B CN106829815B (en) | 2022-08-23 |
Family
ID=59130596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710186523.3A Active CN106829815B (en) | 2017-03-27 | 2017-03-27 | Arm support control system of aerial work platform and aerial work platform |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106829815B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107720642A (en) * | 2017-09-07 | 2018-02-23 | 美通重工有限公司 | Aerial work platform receives arm-type valve group automatically |
| CN109253118A (en) * | 2018-10-29 | 2019-01-22 | 北京航天发射技术研究所 | A kind of automatic switchover constant pressure oil source device based on pressure judgement |
| CN110030217A (en) * | 2019-04-10 | 2019-07-19 | 湖南星邦重工有限公司 | A kind of control system and high-altitude operation vehicle of high altitude operation body frame floating cylinder |
| CN110566523A (en) * | 2019-09-12 | 2019-12-13 | 上海华兴数字科技有限公司 | Hydraulic system and excavator |
| CN110683491A (en) * | 2019-10-11 | 2020-01-14 | 江苏徐工工程机械研究院有限公司 | Arm type aerial work platform safety function control method and control system |
| CN113586557A (en) * | 2021-07-23 | 2021-11-02 | 三一汽车制造有限公司 | Arm support control method, device and system of pumping vehicle and pumping vehicle |
| US20220252086A1 (en) * | 2021-02-11 | 2022-08-11 | Xtreme Manufacturing, Llc | Systems and methods for bleed down and retraction of a construction machine boom |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11263590A (en) * | 1998-03-19 | 1999-09-28 | Furukawa Co Ltd | Crane boom controller |
| JP2000335887A (en) * | 1999-05-28 | 2000-12-05 | Komatsu Ltd | Crane jib derricking and telescope device |
| CN102530784A (en) * | 2011-12-15 | 2012-07-04 | 长沙中联消防机械有限公司 | Work arm hydraulic system of high-altitude operation vehicle and high-altitude operation vehicle with the hydraulic system |
| CN202348798U (en) * | 2011-12-05 | 2012-07-25 | 郑州新大方重工科技有限公司 | Oil supply device and leveling hydraulic system containing same |
| CN203428881U (en) * | 2013-08-21 | 2014-02-12 | 长沙中联消防机械有限公司 | Hydraulic control system of cantilever crane or ladder frame |
| CN103629175A (en) * | 2013-11-28 | 2014-03-12 | 长沙中联消防机械有限公司 | Working hopper hydraulic control system and engineering vehicle |
| CN103640974A (en) * | 2013-11-25 | 2014-03-19 | 无锡起岸重工机械有限公司 | Ship crane remote hydraulic control system |
| CN205187797U (en) * | 2015-12-10 | 2016-04-27 | 合肥亚美科技股份有限公司 | Emergent device of transferring of hydraulic pressure aerial working platform |
| CN207511792U (en) * | 2017-03-27 | 2018-06-19 | 徐工消防安全装备有限公司 | The arm support control system and aerial work platform of aerial work platform |
-
2017
- 2017-03-27 CN CN201710186523.3A patent/CN106829815B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11263590A (en) * | 1998-03-19 | 1999-09-28 | Furukawa Co Ltd | Crane boom controller |
| JP2000335887A (en) * | 1999-05-28 | 2000-12-05 | Komatsu Ltd | Crane jib derricking and telescope device |
| CN202348798U (en) * | 2011-12-05 | 2012-07-25 | 郑州新大方重工科技有限公司 | Oil supply device and leveling hydraulic system containing same |
| CN102530784A (en) * | 2011-12-15 | 2012-07-04 | 长沙中联消防机械有限公司 | Work arm hydraulic system of high-altitude operation vehicle and high-altitude operation vehicle with the hydraulic system |
| CN203428881U (en) * | 2013-08-21 | 2014-02-12 | 长沙中联消防机械有限公司 | Hydraulic control system of cantilever crane or ladder frame |
| CN103640974A (en) * | 2013-11-25 | 2014-03-19 | 无锡起岸重工机械有限公司 | Ship crane remote hydraulic control system |
| CN103629175A (en) * | 2013-11-28 | 2014-03-12 | 长沙中联消防机械有限公司 | Working hopper hydraulic control system and engineering vehicle |
| CN205187797U (en) * | 2015-12-10 | 2016-04-27 | 合肥亚美科技股份有限公司 | Emergent device of transferring of hydraulic pressure aerial working platform |
| CN207511792U (en) * | 2017-03-27 | 2018-06-19 | 徐工消防安全装备有限公司 | The arm support control system and aerial work platform of aerial work platform |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107720642A (en) * | 2017-09-07 | 2018-02-23 | 美通重工有限公司 | Aerial work platform receives arm-type valve group automatically |
| CN109253118A (en) * | 2018-10-29 | 2019-01-22 | 北京航天发射技术研究所 | A kind of automatic switchover constant pressure oil source device based on pressure judgement |
| CN110030217A (en) * | 2019-04-10 | 2019-07-19 | 湖南星邦重工有限公司 | A kind of control system and high-altitude operation vehicle of high altitude operation body frame floating cylinder |
| CN110030217B (en) * | 2019-04-10 | 2023-12-01 | 湖南星邦智能装备股份有限公司 | Control system of floating oil cylinder of chassis of overhead working truck and overhead working truck |
| CN110566523A (en) * | 2019-09-12 | 2019-12-13 | 上海华兴数字科技有限公司 | Hydraulic system and excavator |
| CN110683491A (en) * | 2019-10-11 | 2020-01-14 | 江苏徐工工程机械研究院有限公司 | Arm type aerial work platform safety function control method and control system |
| US20220252086A1 (en) * | 2021-02-11 | 2022-08-11 | Xtreme Manufacturing, Llc | Systems and methods for bleed down and retraction of a construction machine boom |
| EP4043382A1 (en) * | 2021-02-11 | 2022-08-17 | Xtreme Manufacturing, LLC | Systems and methods for bleed down and retraction of a construction machine boom |
| US11976675B2 (en) * | 2021-02-11 | 2024-05-07 | Xtreme Manufacturing, Llc | Systems and methods for bleed down and retraction of a construction machine boom |
| CN113586557A (en) * | 2021-07-23 | 2021-11-02 | 三一汽车制造有限公司 | Arm support control method, device and system of pumping vehicle and pumping vehicle |
| CN113586557B (en) * | 2021-07-23 | 2023-11-17 | 三一汽车制造有限公司 | Arm support control method, device and system of pumping vehicle and pumping vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106829815B (en) | 2022-08-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106829815A (en) | The arm support control system and aerial work platform of aerial work platform | |
| CN103591075B (en) | Hydraulic control system synchronous with crane and balancing weight hydraulic cylinder | |
| CN201240815Y (en) | Mechanical, electrical and hydraulic automatic leveling apparatus for work platform of lifting vehicle | |
| CN207511792U (en) | The arm support control system and aerial work platform of aerial work platform | |
| CN104925694A (en) | Hydraulic lifting platform system capable of achieving synchronous oil cylinder lifting | |
| CN106185737A (en) | A kind of adapt to for high-altitude operation vehicle get on or off the bus handle hydraulic control system | |
| CN204458591U (en) | A kind of hydraulic system of Novel movable lift platform | |
| CN103015725B (en) | Boom hydraulic system, control method thereof, boom system and concrete pumping equipment | |
| CN111943099A (en) | Energy-saving hydraulic system | |
| CN206071993U (en) | A kind of hydraulic control system of the high-altitude operation vehicle of ratio throttle grverning | |
| CN108286540A (en) | A kind of hydraulic system of multifunction hydraulic workbench peculiar to vessel | |
| CN203065031U (en) | Hydraulic leveling system for mining monorail crane and mining machine | |
| CN212868045U (en) | Hydraulic system of aerial work platform | |
| CN210290330U (en) | Vehicle-mounted automatic leveling system | |
| CN107605031A (en) | A kind of drainage car and control method with efficient stable manipulation | |
| CN202937011U (en) | Arm support hydraulic system and arm support system and concrete pumping equipment | |
| CN110127524B (en) | Emergency control system and crane | |
| CN109505810B (en) | Special driving hydraulic system for multifunctional automatic compensation gangway ladder and control method thereof | |
| CN208009616U (en) | A kind of drainage car and control system with efficient stable manipulation | |
| CN202937013U (en) | Cantilever crane hydraulic system, cantilever crane system and concrete pumping equipment | |
| CN206738303U (en) | A kind of independent lift control system of vehicle window | |
| CN210290353U (en) | Expandable square cabin floor lifting system | |
| CN113582093A (en) | Luffing and leveling hydraulic control system of cantilever type aerial work platform | |
| CN210290292U (en) | Vehicle-mounted leveling and antenna lodging control system | |
| CN104613029B (en) | The hydraulic system of Novel movable hoistable platform |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |