CN104373404B - The control system of composite move and method and crane - Google Patents
The control system of composite move and method and crane Download PDFInfo
- Publication number
- CN104373404B CN104373404B CN201410680616.8A CN201410680616A CN104373404B CN 104373404 B CN104373404 B CN 104373404B CN 201410680616 A CN201410680616 A CN 201410680616A CN 104373404 B CN104373404 B CN 104373404B
- Authority
- CN
- China
- Prior art keywords
- electromagnetic valve
- control
- oil
- valve
- proportional reversing
- 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.)
- Active
Links
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/20—Control systems or devices for non-electric drives
-
- 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
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Magnetically Actuated Valves (AREA)
- Control And Safety Of Cranes (AREA)
Abstract
The invention discloses the control system of a kind of composite move and method and crane, control electromagnetic valve all it is separately provided in each control chamber of two proportional reversing valves, by control each control electromagnetic valve the state of electric and dead electricity, and the selection to handle output circuit, the present invention is made can not only individually to control the action of each executive component, and the action of two executive components can be controlled simultaneously, it is achieved that the control of composite move.Further, owing to the oil return opening of each control electromagnetic valve connects with fuel tank by the way of series connection, unloading rate is fast and does not has action remaining.Additionally, each of proportional reversing valve controls chamber does not has interconnection with the oil circuit controlling electromagnetic valve, so that on the one hand do not have the oil phenomenon that leaps up to cause the generation of misoperation situation, on the other hand, can also be integrated in controlling electromagnetic valve on main valve, decrease pipeline and connect, thus reduce cost.
Description
Technical field
The present invention relates to technical field of engineering machinery, the control system of a kind of composite move and
Method and crane.
Background technology
Crane typically has master file, secondary volume, luffing, flexible and revolution five big basic actss, its
In two or more actions can carry out simultaneously, referred to as composite move.But, owing to rising
The control crank of heavy-duty machine controls four groups of actions only, it is therefore desirable to wherein between two basic actss
Switch over, such as, switch between flexible and secondary scrolling is made.
As a example by the action to flexible and secondary volume switches over control, in prior art, generally use
Two position four-way solenoid valves switch over control.As it is shown in figure 1, switching solenoid valve 1 ' and switching electromagnetism
The switching that flexible and secondary scrolling is made is responsible for by valve 2 ', and off-load electromagnetic valve 3 ' and off-load electromagnetic valve 4 ' are responsible for unloading
Lotus, specific works process is: when switching solenoid valve 1 ' dead electricity, the hydraulic oil controlled from handle
Enter pair volume pilot control chamber, handle pair volume off the hook；When switching solenoid valve 1 ' obtains electric, from hands
The hydraulic oil that handle controls enters flexible pilot control chamber, handles arm elongation.When switching solenoid valve 2 '
During dead electricity, the hydraulic oil controlled from handle enters flexible pilot control chamber, handles arm and retracts；
When switching solenoid valve 2 ' obtains electric, the hydraulic oil controlled from handle enters pair volume pilot control chamber,
Handle pair and roll hook.When off-load electromagnetic valve 3 ' obtains electric, the hydraulic oil flow oil return controlled from handle
Case, cuts off arm elongation simultaneously and pair rolls hook action；When off-load electromagnetic valve 4 ' obtains electric, cut off
The off the hook action of secondary volume.
But, in actual use, carry out the elongation of arm and the compound of secondary volume off the hook simultaneously
Action, or to carry out the retraction of arm with the secondary composite move rolling hook be the behaviour that user commonly uses simultaneously
Vertical operating mode.And existing control method can not control arm elongation and the off the hook action of secondary volume simultaneously, also
Arm retraction can not be controlled simultaneously and roll hook action with pair, i.e. can not realize hoisting arm expansion and pair is rolled
The control of the composite move of off the hook, this brings constant to user operation.
Additionally, existing control method uses parallel unloading way, when off-load electromagnetic valve 3 ' or 4 '
When obtaining electric, the hydraulic oil part that handle controls flows back to fuel tank, and a part still is able to enter secondary volume first
Lead control chamber or flexible pilot control chamber, cause off-load occurring endless, the problem that action is remaining.And
And, owing to there is the interconnection of oil circuit between pilot control chamber, oil of leaping up easily occurs, cause by mistake
Action phenomenon.It addition, by pilot system in existing control, the most above-mentioned switching solenoid valve and off-load
Electromagnetic valve is integrated on main valve and designs more difficult, need to design independent pilot-actuated valve, have impact on into
Basis and reliability.
Summary of the invention
Embodiment of the present invention technical problem to be solved includes: crane can not carry out composite move
The high problem of the problem of control, off-load problem not to the utmost and control system cost.
According to an aspect of the present invention, it is provided that the control system of a kind of composite move, including:
One proportional reversing valve, the second proportional reversing valve, first control electromagnetic valve, second control electromagnetic valve,
3rd controls electromagnetic valve and the 4th controls electromagnetic valve, wherein: the of described first proportional reversing valve
One control port connects with the described first actuator port controlling electromagnetic valve, described first ratio commutation
Second control port of valve connects with the described 4th actuator port controlling electromagnetic valve, described first ratio
The actuator port of example reversal valve and the connection of the first executive component, the oil-feed of described first proportional reversing valve
Mouth connects with oil pump, and the oil-out of described first proportional reversing valve connects with fuel tank；Described second ratio
First control port of example reversal valve connects with the described second actuator port controlling electromagnetic valve, described
Second control port of the second proportional reversing valve controls the actuator port of electromagnetic valve even with the described 3rd
Logical, the actuator port of described second proportional reversing valve and the connection of the second executive component, described second ratio
The oil-in of example reversal valve connects with oil pump, and the oil-out of described second proportional reversing valve is with fuel tank even
Logical；Described first controls electromagnetic valve and the described 3rd controls the oil-in of electromagnetic valve and the first of handle
Output circuit connect, described second control electromagnetic valve and described 4th control electromagnetic valve oil-in with
Second output circuit connection of handle；Described first controls electromagnetic valve, described second control electromagnetism
Valve, described 3rd control electromagnetic valve connect with fuel tank with the described 4th oil return opening controlling electromagnetic valve.
In one embodiment, the actuator port of described first proportional reversing valve includes the first working oil
Mouth and the second actuator port, described first executive component is motor, described first proportional reversing valve
First actuator port connects with the first hydraulic fluid port of described motor, the second of described first proportional reversing valve
Actuator port connects with the second hydraulic fluid port of described motor；The actuator port of described second proportional reversing valve
Including the first actuator port and the second actuator port, described second executive component is telescopic oil cylinder, institute
The rodless cavity of the first actuator port and described telescopic oil cylinder of stating the second proportional reversing valve connects, described
Second actuator port of the second proportional reversing valve connects with the rod chamber of described telescopic oil cylinder.
In one embodiment, when described first control electromagnetic valve, described second control electromagnetic valve,
Described 3rd controls electromagnetic valve and the described 4th controls the equal dead electricity of electromagnetic valve, and handle is defeated to first
During vent line fuel feeding, the described first oil-in controlling electromagnetic valve connects with actuator port, hydraulic oil
Described first proportional reversing valve is entered with actuator port by the described first oil-in controlling electromagnetic valve
First control chamber, to drive described first executive component to perform the first action；Described 3rd controls
The oil-in of electromagnetic valve connects with actuator port, and hydraulic oil controls entering of electromagnetic valve by the described 3rd
Hydraulic fluid port and actuator port enter the first control chamber of described second proportional reversing valve, to drive described the
Two executive components perform the second action.
In one embodiment, when described first control electromagnetic valve, described second control electromagnetic valve,
Described 3rd controls electromagnetic valve and the described 4th controls the equal dead electricity of electromagnetic valve, and handle is defeated to second
During vent line fuel feeding, the described 4th oil-in controlling electromagnetic valve connects with actuator port, hydraulic oil
Described first proportional reversing valve is entered with actuator port by the described 4th oil-in controlling electromagnetic valve
Second control chamber, with drive described first executive component perform the 3rd action；Described second controls
The oil-in of electromagnetic valve connects with actuator port, and hydraulic oil controls entering of electromagnetic valve by described second
Hydraulic fluid port and actuator port enter the second control chamber of described second proportional reversing valve, to drive described the
Two executive components perform the 4th action.
In one embodiment, control electromagnetic valve when described first and described 4th control electromagnetic valve loses
Second control electromagnetic valve electric, described and the described 3rd controls electromagnetic valve and obtains electric, and handle is to first
During output circuit fuel feeding, the described first oil-in controlling electromagnetic valve connects with actuator port, hydraulic pressure
Oil enters described first ratio by the described first oil-in controlling electromagnetic valve with actuator port and commutates
First control chamber of valve, to drive described first executive component to perform the first action；When described first
Control electromagnetic valve and the described 4th to control electromagnetic valve dead electricity, described second control electromagnetic valve and described the
Three control electromagnetic valve obtains electric, and handle is when the second output circuit fuel feeding, and described first controls electricity
The oil-in of magnet valve connects with actuator port；Described 4th oil-in controlling electromagnetic valve and working oil
Mouth connection, hydraulic oil is described by the described 4th oil-in controlling electromagnetic valve and actuator port entrance
Second control chamber of the first proportional reversing valve, moves to drive described first executive component to perform the 3rd
Make.
In one embodiment, control electromagnetic valve when described second and described 3rd control electromagnetic valve loses
First control electromagnetic valve electric, described and the described 4th controls electromagnetic valve and obtains electric, and handle is to first
During output circuit fuel feeding, the described 3rd oil-in controlling electromagnetic valve connects with actuator port, hydraulic pressure
Oil enters described second ratio by the described 3rd oil-in controlling electromagnetic valve with actuator port and commutates
First control chamber of valve, to drive described second executive component to perform the second action；When described second
Control electromagnetic valve and the described 3rd to control electromagnetic valve dead electricity, described first control electromagnetic valve and described the
Four control electromagnetic valve obtains electric, and handle is when the second output circuit fuel feeding, and described second controls electricity
The oil-in of magnet valve connects with actuator port, and hydraulic oil is by the described second oil-feed controlling electromagnetic valve
Mouth and actuator port enter the second control chamber of described second proportional reversing valve, to drive described second
Executive component performs the 4th action.
In one embodiment, when described first control electromagnetic valve, described second control electromagnetic valve,
Described 3rd control electromagnetic valve and the described 4th control electromagnetic valve all electric time, described first control electric
Magnet valve, described second control electromagnetic valve, described 3rd control electromagnetic valve and the described 4th control electromagnetism
The respective actuator port of valve connects with respective oil return opening.
According to a further aspect in the invention, it is provided that a kind of crane, carry including above-mentioned any embodiment
The control system of the composite move of confession.
According to another aspect of the invention, it is provided that a kind of based on being combined that above-mentioned any embodiment provides
The control method of the composite move of the control system of action, including: first control electromagnetic valve, second
When controlling electromagnetic valve, the 3rd control electromagnetic valve and the 4th control equal dead electricity of electromagnetic valve, joystick
To the first output circuit fuel feeding so that hydraulic oil simultaneously enters the first control of the first proportional reversing valve
Chamber and the first control chamber of the second proportional reversing valve, move to drive the first executive component to perform first
Make, and simultaneously drive the second executive component and perform the second action；First controls electromagnetic valve, the second control
Electromagnetic valve processed, the 3rd control electromagnetic valve and the 4th control electromagnetic valve equal dead electricity time, joystick to
Second output circuit fuel feeding so that hydraulic oil simultaneously enters the second control chamber of the first proportional reversing valve
Chamber is controlled with the second of the second proportional reversing valve, to drive the first executive component to perform the 3rd action,
And simultaneously drive the second executive component execution the 4th action.
In one embodiment, described method also includes: first controls electromagnetic valve and the 4th controls electricity
When magnet valve dead electricity, the second control electromagnetic valve and the 3rd control electromagnetic valve obtain electric, joystick is to first
Output circuit fuel feeding, hydraulic oil enters the first control chamber of the first proportional reversing valve, to drive first
Executive component performs the first action；Joystick is to the second output circuit fuel feeding, and hydraulic oil enters the
Second control chamber of one proportional reversing valve, to drive the first executive component to perform the 3rd action；Second
Control electromagnetic valve and the 3rd and control electromagnetic valve dead electricity, the first control electromagnetic valve and the 4th control electromagnetic valve
When obtaining electric, joystick enters the second proportional reversing valve to the first output circuit fuel feeding, hydraulic oil
First controls chamber, to drive the second executive component to perform the second action；Joystick is to the second output
Oil circuit fuel feeding, hydraulic oil enters the second control chamber of the second proportional reversing valve, to drive the second execution
Element performs the 4th action.
The embodiment of the present invention proposes the control program of a kind of new composite move, commutates two ratios
Each of valve controls chamber and is all separately provided control electromagnetic valve, by controlling each control electromagnetic valve
Obtain the electric and state of dead electricity, and the selection to handle output circuit so that the present invention can not only
Individually control the action of each executive component, and the dynamic of two executive components can be controlled simultaneously
Make, it is achieved that the control of composite move.Further, pass through due to the oil return opening of each control electromagnetic valve
The mode of series connection connects with fuel tank, and unloading rate is fast and does not has action remaining.Additionally, ratio commutation
Each oil circuit controlling chamber and control electromagnetic valve of valve does not has interconnection, so that the most not
There will be the oil phenomenon that leaps up and cause the generation of misoperation situation, on the other hand, it is also possible to electromagnetism will be controlled
Valve is integrated on main valve, decreases pipeline and connects, thus reduces cost.
Below by drawings and Examples, technical scheme is done and further retouches in detail
State.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will
The accompanying drawing used required in embodiment or description of the prior art is briefly described, it is clear that
Ground, the accompanying drawing in describing below is only some embodiments of the present invention, skill common for this area
From the point of view of art personnel, on the premise of not paying creative work, it is also possible to obtain according to these accompanying drawings
Obtain other accompanying drawing.
Fig. 1 is to use two position four-way solenoid valves to cut the action of flexible and secondary volume in prior art
Change the schematic diagram of control；
Fig. 2 is the schematic diagram of one embodiment of control system of composite move of the present invention；
Fig. 3 is the schematic diagram of one Application Example of control system of composite move of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, to the technical scheme in the embodiment of the present invention
It is clearly and completely described, it is clear that described embodiment is only that a part of the present invention is real
Execute example rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under not making creative work premise, broadly falls into this
The scope of invention protection.
Unless specifically stated otherwise, the parts illustrated the most in these embodiments and the phase of step
Layout, numerical expression and numerical value are not limited the scope of the invention.
Simultaneously, it should be appreciated that for the ease of describing, the chi of the various piece shown in accompanying drawing
Very little is not to draw according to actual proportionate relationship.
May not make in detail for technology, method and apparatus known to person of ordinary skill in the relevant
Thin discussion, but in the appropriate case, described technology, method and apparatus should be considered to authorize to be said
A part for bright book.
Shown here with in all examples discussed, any occurrence should be construed as merely
Exemplary rather than conduct limits.Therefore, other example of exemplary embodiment can have
There is different values.
It should also be noted that similar label and letter represent similar terms in following accompanying drawing, because of
This, be defined in the most a certain Xiang Yi accompanying drawing, then need not it in accompanying drawing subsequently
It is further discussed.
Fig. 2 is the schematic diagram of one embodiment of control system of composite move of the present invention.Such as Fig. 2
Shown in, this system includes: first proportional reversing valve the 1, second proportional reversing valve 2, first is controlled
Electromagnetic valve 3, second processed controls electromagnetic valve the 4, the 3rd and controls electromagnetic valve 5 and the 4th control electromagnetism
Valve 6, wherein:
First control port of the first proportional reversing valve 1 and the first actuator port controlling electromagnetic valve 3
A mouth connects, the second control port of the first proportional reversing valve 1 and the 4th work controlling electromagnetic valve 6
Making hydraulic fluid port connection, actuator port and first executive component 7 of the first proportional reversing valve 1 connect, the
The oil-in of one proportional reversing valve 1 connects with oil pump, the oil-out of the first proportional reversing valve 1 and oil
Case connects；First control port of the second proportional reversing valve 2 and the second work controlling electromagnetic valve 4
Hydraulic fluid port connects, the second control port of the second proportional reversing valve 2 and the 3rd work controlling electromagnetic valve 5
Making hydraulic fluid port connection, actuator port and second executive component 8 of the second proportional reversing valve 2 connect, the
The oil-in of two proportional reversing valves 2 connects with oil pump, the oil-out of the second proportional reversing valve 2 and oil
Case connects；First controls electromagnetic valve 3 and the 3rd controls the oil-in of electromagnetic valve 5 and the first of handle
Output circuit connects, and second controls electromagnetic valve 4 and the oil-in of the 4th control electromagnetic valve 6 and handle
Second output circuit connection；First controls electromagnetic valve 3, second controls electromagnetic valve the 4, the 3rd control
Electromagnetic valve 5 processed connects with fuel tank with the 4th oil return opening controlling electromagnetic valve 6.
Wherein, the first executive component 7 and the second executive component 8 can select according to actual should being used for
Select.The above-mentioned actuator port that each controls electromagnetic valve can be such as the A mouth of each control electromagnetic valve
Or B mouth.The actuator port of above-mentioned first proportional reversing valve can be such as A1 mouth and/or B1
Mouthful, the actuator port of above-mentioned second proportional reversing valve can be such as A2 mouth and/or B2 mouth.
In the present embodiment, all it is separately provided control electricity in each control chamber of two proportional reversing valves
Magnet valve, by controlling the electric and state of dead electricity that obtains of each control electromagnetic valve, and to handle output
The selection of oil circuit so that the present invention can not only individually control the action of each executive component, and
The action of two executive components can be controlled, it is achieved that the control of composite move simultaneously.Further, by
Oil return opening in each control electromagnetic valve connects with fuel tank by the way of series connection, unloading rate soon and
Do not have action remaining.Do not have additionally, each of proportional reversing valve controls chamber with the oil circuit controlling electromagnetic valve
There is interconnection, so that on the one hand do not have the oil phenomenon that leaps up to cause sending out of misoperation situation
Raw, on the other hand, it is also possible to control electromagnetic valve is integrated on main valve, decrease pipeline and connect,
Thus reduce cost.
Fig. 3 is the schematic diagram of one Application Example of control system of composite move of the present invention.As
Shown in Fig. 3, the actuator port of the first proportional reversing valve 1 in this Application Example includes first
Actuator port and the second actuator port, the first executive component 7 is motor, the first proportional reversing valve 1
The first actuator port connect with the first hydraulic fluid port of motor, the first proportional reversing valve 1 second work
Hydraulic fluid port connects with the second hydraulic fluid port of motor；The actuator port of the second proportional reversing valve 2 includes the first work
Making hydraulic fluid port and the second actuator port, the second executive component 8 is telescopic oil cylinder, the second proportional reversing valve
First actuator port of 2 connects with the rodless cavity of telescopic oil cylinder, the second of the second proportional reversing valve 2
Actuator port connects with the rod chamber of telescopic oil cylinder.
In the present embodiment, control in chamber when the hydraulic oil of handle control enters the first proportional reversing valve 1
Time, the first proportional reversing valve 1 commutates, thus drives the motor corresponding action of execution, such as, when
During motor forward or reverse, secondary elevator can be driven to hook up or off the hook.When the hydraulic oil that handle controls
Entering the first proportional reversing valve 2 when controlling in chamber, the second proportional reversing valve 2 commutates, thus drives
Telescopic oil cylinder performs corresponding action, such as, when the rodless cavity of telescopic oil cylinder enters hydraulic oil,
Arm can be driven to extend, when the rod chamber of telescopic oil cylinder enters hydraulic oil, arm can be driven
Retract.Control each control electromagnetic valve respectively obtains electric and power failure state, can separately or concurrently control
Motor processed and the action of telescopic oil cylinder, thus realize secondary hoisting crane off the hook and hoisting arm expansion further
The control of composite move.
In embodiment shown in Fig. 2 and Fig. 3, when each control electromagnetic valve the shape of electric and dead electricity
State is different, and during the selection difference of handle output circuit, the feelings of two executive component execution actions
Condition is the most different, will illustrate respectively below.
In one embodiment of the control system of composite move of the present invention, see Fig. 2 or Fig. 3,
When first controls electromagnetic valve the 3, second control electromagnetic valve the 4, the 3rd control electromagnetic valve 5 and the 4th control
The equal dead electricity of electromagnetic valve 6 processed, and handle is when the first output circuit fuel feeding, and first controls electromagnetic valve
The oil-in of 3 connects with actuator port, and the hydraulic oil that handle controls is by the first control electromagnetic valve 3
Oil-in and actuator port enter the first control chamber 11 of the first proportional reversing valve 1, the first ratio
The oil-in of reversal valve 1 is switched to and the second actuator port B1 from connecting with the first actuator port A1
Connection, to drive the first executive component 7 to perform the first action.In this case, the 3rd controls
The oil-in of electromagnetic valve 5 connects with actuator port, and hydraulic oil is entered by the 3rd control electromagnetic valve 5
Hydraulic fluid port and actuator port enter the first control chamber 21 of the second proportional reversing valve 2, the second ratio commutation
The oil-in of valve 2 from connect with the second actuator port B2 be switched to and the first actuator port A2 even
Logical, to drive the second executive component 8 to perform the second action.
The present embodiment can realize the first executive component 7 and perform the first action, the second executive component 8
Perform the complex controll of the second action.When the first executive component 7 is motor, the second executive component 8
During for telescopic oil cylinder, motor can be switched to reversion (the first action) by rotating forward, thus drives secondary volume
Raising off the hook, and hydraulic oil enters the rodless cavity of telescopic oil cylinder, (second moves in telescopic oil cylinder elongation
Make), thus drive arm to extend.Additionally, second controls oil-in and the working oil of electromagnetic valve 4
Mouth connection, the 4th oil-in controlling electromagnetic valve 6 also connects with actuator port.But due to handle to
First via output circuit fuel feeding, therefore, the hydraulic oil that handle controls can not enter the first ratio and change
To the second control chamber 12 of valve 1 and the second control chamber 22 of the second proportional reversing valve 2.
In another embodiment of the control system of composite move of the present invention, when first controls electromagnetism
Valve 3, second controls electromagnetic valve the 4, the 3rd control electromagnetic valve 5 and the 4th control electromagnetic valve 6 all loses
Electricity, and handle is when the second output circuit fuel feeding, and the 4th controls oil-in and the work of electromagnetic valve 6
Making hydraulic fluid port connection, hydraulic oil enters the by oil-in and the actuator port of the 4th control electromagnetic valve 6
Second control chamber 12 of one proportional reversing valve 1, the oil-in of the first proportional reversing valve 1 is from second
Actuator port B1 connection is switched to connect with the first actuator port A1, to drive first to perform unit
Part 7 performs the 3rd action.In this case, second controls the oil-in of electromagnetic valve 4 and work
Hydraulic fluid port connects, and hydraulic oil enters second by the oil-in of the second control electromagnetic valve 4 with actuator port
Proportional reversing valve 2 second control chamber 22, the oil-in of the second proportional reversing valve 2 from the first work
Make hydraulic fluid port A2 connection to be switched to connect with the second actuator port B2, to drive the second executive component 8
Perform the 4th action.
The present embodiment can realize the first executive component 7 and perform the 3rd action, the second executive component 8
Perform the complex controll of the 4th action.When the first executive component 7 is motor, the second executive component 8
During for telescopic oil cylinder, motor can be switched to rotating forward (the 3rd action) by reversion, thus drives secondary volume
Kicking up hook, and hydraulic oil enters the rod chamber of telescopic oil cylinder, telescopic oil cylinder is retracted, and (the 4th moves
Make), thus drive arm to retract.Additionally, first controls oil-in and the working oil of electromagnetic valve 3
Mouthful connection, the 3rd oil-in controlling electromagnetic valve 5 connects with actuator port, but owing to handle is to the
Two road output circuit fuel feeding, therefore, the hydraulic oil that handle controls can not enter the first ratio commutation
First control chamber 11 of valve 1 and the second control chamber 21 of the second proportional reversing valve 2.
In another embodiment of the control system of composite move of the present invention, when first controls electromagnetism
Valve 3 and the 4th controls electromagnetic valve 6 dead electricity, the second control electromagnetic valve 4 and the 3rd controls electromagnetic valve 5
When obtaining electric, including two kinds of situations:
In the case of one, handle is to the first output circuit fuel feeding, and first controls entering of electromagnetic valve 3
Hydraulic fluid port connects with actuator port, and hydraulic oil is by the first oil-in controlling electromagnetic valve 3 and working oil
Mouth enters the first control chamber 11 of the first proportional reversing valve 1, the oil-in of the first proportional reversing valve 1
It is switched to connect with the second actuator port B1 from connecting with the first actuator port A1, to drive
One executive component 7 performs the first action；
In the case of another kind, handle is to the second output circuit fuel feeding, and the 4th controls entering of electromagnetic valve 6
Hydraulic fluid port connects with actuator port, and hydraulic oil is by the 4th oil-in controlling electromagnetic valve 6 and working oil
Mouth enters the second control chamber 12 of the first proportional reversing valve 1, the oil-in of the first proportional reversing valve 1
It is switched to connect with the first actuator port A1 from connecting with the second actuator port B1, to drive
One executive component 7 performs the 3rd action.
In the present embodiment, the second actuator port controlling electromagnetic valve 4 connects with oil return opening, the 3rd control
The actuator port of electromagnetic valve 5 processed connects with oil return opening, and the second executive component 8 can not perform action.
And by the output circuit of joystick, can individually control the first executive component 7 action.Specifically
Ground, when the first executive component 7 is motor, can individually control hooking up of secondary elevator and move with off the hook
Make.
In another embodiment of the control system of composite move of the present invention, when second controls electromagnetism
Valve 4 and the 3rd controls electromagnetic valve 5 dead electricity, the first control electromagnetic valve 3 and the 4th controls electromagnetic valve 6
Electric time, also include two kinds of situations:
In the case of one, handle is to the first output circuit fuel feeding, and the 3rd controls the oil-feed of electromagnetic valve 5
Mouth connects with actuator port, and hydraulic oil is by the 3rd oil-in controlling electromagnetic valve 5 and actuator port
Enter the second proportional reversing valve 2 first control chamber 21, the oil-in of the second proportional reversing valve 2 from
Connect with the second actuator port B2 and be switched to connect, to drive second with the first actuator port A2
Executive component 8 performs the second action；
In the case of another kind, handle is to the second output circuit fuel feeding, and second controls entering of electromagnetic valve 4
Hydraulic fluid port connects with actuator port, and hydraulic oil is by the second oil-in controlling electromagnetic valve 4 and working oil
Mouth enters the second control chamber 22 of the second proportional reversing valve 2, the oil-in of the second proportional reversing valve 2
It is switched to connect with the second actuator port B2 from connecting with the first actuator port A2, to drive
Two executive components 8 perform the 4th action.
In the present embodiment, the first actuator port controlling electromagnetic valve 3 connects with oil return opening, the 4th control
The actuator port of electromagnetic valve 6 processed connects with oil return opening.First executive component 7 can not perform action.
And by the output circuit of joystick, can individually control the second executive component 8 action.Specifically
Ground, when the second executive component 8 is telescopic oil cylinder, can individually control elongation and the contracting of arm
Return.
It is pointed out that when the first executive component 7 be motor, the second executive component 8 be flexible
During oil cylinder, although above embodiment being dynamic as reversion and just using the first action and the 4th
Turn, the second action and the 4th action are to be extended and retracted to describe, but those skilled in the art
Be appreciated that vice versa, if can realize simultaneously the elongation of arm and the off the hook of secondary elevator,
And realize simultaneously arm shrink and secondary elevator hook up action.
In the further embodiment of the control system of composite move of the present invention, when first controls electromagnetism
Valve 3, second controls electromagnetic valve the 4, the 3rd control electromagnetic valve 5 and the 4th control electromagnetic valve 6 all obtains
During electricity, first controls electromagnetic valve 3, second controls electromagnetic valve 4, the 3rd controls electromagnetic valve 5 and the
Four control the respective actuator port of electromagnetic valve 6 connects with respective oil return opening.
In the present embodiment, each control electromagnetic valve all electric time, the control chamber of proportional solenoid is direct
By controlling the actuator port of electromagnetic valve, oil return opening connects with fuel tank, and unloading rate is fast and the most dynamic
Make remnants.
In actual applications, can realize controlling the first executive components and the by three rocker switch
The composite move of two executive components, individually control the action of the first executive component, individually control second
The switching of three kinds of duties of action of executive component.
The control system of composite move based on any of the above-described embodiment, the composite move of the present invention
In one embodiment of control method, including:
First controls electromagnetic valve 3, second controls electromagnetic valve 4, the 3rd controls electromagnetic valve 5 and the
During four control electromagnetic valve 6 equal dead electricity, joystick is to the first output circuit fuel feeding so that hydraulic oil
Simultaneously enter the first control chamber 11 and the of the second proportional reversing valve 2 of the first proportional reversing valve 1
One controls chamber 21, and the oil-in of the first proportional reversing valve 1 is cut from connecting with the first actuator port A1
Change to connect with the second actuator port B1, the oil-in of the second proportional reversing valve 2 from the second work
Make hydraulic fluid port B2 connection to be switched to connect with the first actuator port A2, thus drive first to perform unit
Part 7 performs the first action, and simultaneously drives the second executive component 8 and perform the second action；
First controls electromagnetic valve 3, second controls electromagnetic valve 4, the 3rd controls electromagnetic valve 5 and the
During four control electromagnetic valve 6 equal dead electricity, joystick is to the second output circuit fuel feeding so that hydraulic oil
Simultaneously enter the second control chamber 12 and the of the second proportional reversing valve 2 of the first proportional reversing valve 1
Two control chambeies 22, and the oil-in of the first proportional reversing valve 1 is cut from connecting with the second actuator port B1
Change to connect with the first actuator port A1, the oil-in of the second proportional reversing valve 2 from the first work
Make hydraulic fluid port A2 connection to be switched to connect with the second actuator port B2, thus drive first to perform unit
Part 7 performs the 3rd action, and simultaneously drives the second executive component 8 and perform the 4th action.
The control method of the present embodiment can realize the first executive component 7 and perform the first action and second
Executive component 8 performs the second action and the first executive component 7 performs the 3rd action and second and holds
Units 8 performs the control of the composite move of the 4th action.
In another embodiment of the control method of the composite move of the present invention, also include:
First controls electromagnetic valve 3 and the 4th controls electromagnetic valve 6 dead electricity, the second control electromagnetic valve 4 and
When 3rd control electromagnetic valve 5 obtains electric, joystick enters to the first output circuit fuel feeding, hydraulic oil
First control chamber 11 of the first proportional reversing valve 1, the oil-in of the first proportional reversing valve 1 is from the
One actuator port A1 connection is switched to connect with the second actuator port B1, to drive the first execution
Element 7 performs the first action；Joystick enters first to the second output circuit fuel feeding, hydraulic oil
Proportional reversing valve 1 second control chamber 12, the oil-in of the first proportional reversing valve 1 from the second work
Make hydraulic fluid port B1 connection to be switched to connect with the first actuator port A1, to drive the first executive component 7
Perform the 3rd action；
Second controls electromagnetic valve 4 and the 3rd controls electromagnetic valve 5 dead electricity, the first control electromagnetic valve 3 and
When 4th control electromagnetic valve 6 obtains electric, joystick enters to the first output circuit fuel feeding, hydraulic oil
First control chamber 21 of the second proportional reversing valve 2, the oil-in of the second proportional reversing valve 2 is from the
Two actuator port B2 connections are switched to connect with the first actuator port A2, to drive the second execution
Element 8 performs the second action；Joystick enters second to the second output circuit fuel feeding, hydraulic oil
Proportional reversing valve 2 second control chamber 22, the oil-in of the second proportional reversing valve 2 from the first work
Make hydraulic fluid port A2 connection to be switched to connect with the second actuator port B2, to drive the second executive component 8
Perform the 4th action.
The control method of the present embodiment can realize the first executive component 7 and perform the first action and the 3rd
The independent control of action, and the second executive component 8 performs the independent of the second action and the 4th action
Control.
The control system of the composite move that the various embodiments described above of the present invention provide can be applied at crane
On.
In one embodiment of crane of the present invention, can include that what above-mentioned any embodiment provided answers
The control system of conjunction action.
In describing the invention, it is to be understood that use " first ", " second ",
The word such as " the 3rd ", " the 4th " limits parts, it is only for be easy to above-mentioned zero
Parts are distinguished, and as not having Stated otherwise, above-mentioned word does not has particular meaning, the most not
It is understood that as limiting the scope of the invention.
Description of the invention is given for the sake of example and description, and is not exhaustively
Or it limit the invention to disclosed form.Many modifications and variations are for the common skill of this area
It is obvious for art personnel.Selecting and describing embodiment is the principle in order to the present invention is more preferably described
Apply with reality, and make those of ordinary skill in the art it will be appreciated that the present invention thus design is suitable
The various embodiments with various amendments in special-purpose.
Claims (9)
1. a control system for composite move, including: the first proportional reversing valve (1), second
Proportional reversing valve (2), the first control electromagnetic valve (3), the second control electromagnetic valve (4), the 3rd control
Electromagnetic valve processed (5) and the 4th controls electromagnetic valve (6), wherein:
First control port of described first proportional reversing valve (1) controls electromagnetic valve with described first
(3) actuator port connection, the second control port of described first proportional reversing valve (1) and institute
State the actuator port connection of the 4th control electromagnetic valve (6), described first proportional reversing valve (1)
Actuator port and the first executive component (7) connection, the oil-feed of described first proportional reversing valve (1)
Mouth connects with oil pump, and the oil-out of described first proportional reversing valve (1) connects with fuel tank；
First control port of described second proportional reversing valve (2) controls electromagnetic valve with described second
(4) actuator port connection, the second control port of described second proportional reversing valve (2) and institute
State the actuator port connection of the 3rd control electromagnetic valve (5), described second proportional reversing valve (2)
Actuator port and the second executive component (8) connection, the oil-feed of described second proportional reversing valve (2)
Mouth connects with oil pump, and the oil-out of described second proportional reversing valve (2) connects with fuel tank；
Described first control electromagnetic valve (3) and described 3rd control electromagnetic valve (5) oil-in and
First output circuit connection of handle, described second controls electromagnetic valve (4) and the described 4th controls
The oil-in of electromagnetic valve (6) connects with the second output circuit of handle；
Described first controls electromagnetic valve (3), described second control electromagnetic valve (4), described 3rd control
Electromagnetic valve processed (5) connects with fuel tank with the described 4th oil return opening controlling electromagnetic valve (6)；
When described first control electromagnetic valve (3), described second control electromagnetic valve (4), the described 3rd
Control electromagnetic valve (5) and the described 4th and control electromagnetic valve (6) all dead electricity, and handle is to first
During output circuit fuel feeding, described first controls the oil-in of electromagnetic valve (3) with actuator port even
Logical, hydraulic oil enters institute by the described first oil-in controlling electromagnetic valve (3) with actuator port
State the first control chamber (11) of the first proportional reversing valve (1), to drive described first executive component
(7) the first action is performed；Described 3rd controls the oil-in of electromagnetic valve (5) with actuator port even
Logical, hydraulic oil enters institute by the described 3rd oil-in controlling electromagnetic valve (5) with actuator port
State the first control chamber (21) of the second proportional reversing valve (2), to drive described second executive component
(8) the second action is performed.
System the most according to claim 1, it is characterised in that
The actuator port of described first proportional reversing valve (1) includes the first actuator port and the second work
Making hydraulic fluid port, described first executive component (7) is motor, described first proportional reversing valve (1)
First actuator port connects with the first hydraulic fluid port of described motor, described first proportional reversing valve (1)
The second actuator port connect with the second hydraulic fluid port of described motor；
The actuator port of described second proportional reversing valve (2) includes the first actuator port and the second work
Making hydraulic fluid port, described second executive component (8) is telescopic oil cylinder, described second proportional reversing valve
(2) the first actuator port connects with the rodless cavity of described telescopic oil cylinder, and described second ratio is changed
Connect with the rod chamber of described telescopic oil cylinder to the second actuator port of valve (2).
System the most according to claim 1 and 2, it is characterised in that
When described first control electromagnetic valve (3), described second control electromagnetic valve (4), the described 3rd
Control electromagnetic valve (5) and the described 4th and control electromagnetic valve (6) all dead electricity, and handle is to second
During output circuit fuel feeding, the described 4th controls the oil-in of electromagnetic valve (6) with actuator port even
Logical, hydraulic oil enters institute by the described 4th oil-in controlling electromagnetic valve (6) with actuator port
State the second control chamber (12) of the first proportional reversing valve (1), to drive described first executive component
(7) the 3rd action is performed；Described second controls the oil-in of electromagnetic valve (4) with actuator port even
Logical, hydraulic oil enters institute by the described second oil-in controlling electromagnetic valve (4) with actuator port
State the second control chamber (22) of the second proportional reversing valve (2), to drive described second executive component
(8) the 4th action is performed.
System the most according to claim 1 and 2, it is characterised in that
When described first controls electromagnetic valve (3) and described 4th control electromagnetic valve (6) dead electricity, institute
State the second control electromagnetic valve (4) and described 3rd control electromagnetic valve (5) electric, and handle to
During the first output circuit fuel feeding, described first controls oil-in and the actuator port of electromagnetic valve (3)
Connection, hydraulic oil is entered with actuator port by the described first oil-in controlling electromagnetic valve (3)
First control chamber (11) of described first proportional reversing valve (1), to drive described first to perform unit
Part (7) performs the first action；
When described first controls electromagnetic valve (3) and described 4th control electromagnetic valve (6) dead electricity, institute
State the second control electromagnetic valve (4) and described 3rd control electromagnetic valve (5) electric, and handle to
During the second output circuit fuel feeding, the described 4th controls oil-in and the actuator port of electromagnetic valve (6)
Connection, hydraulic oil is entered with actuator port by the described 4th oil-in controlling electromagnetic valve (6)
Second control chamber (12) of described first proportional reversing valve (1), to drive described first to perform unit
Part (7) performs the 3rd action.
System the most according to claim 1 and 2, it is characterised in that
When described second controls electromagnetic valve (4) and described 3rd control electromagnetic valve (5) dead electricity, institute
State the first control electromagnetic valve (3) and described 4th control electromagnetic valve (6) electric, and handle to
During the first output circuit fuel feeding, the described 3rd controls oil-in and the actuator port of electromagnetic valve (5)
Connection, hydraulic oil is entered with actuator port by the described 3rd oil-in controlling electromagnetic valve (5)
First control chamber (21) of described second proportional reversing valve (2), to drive described second to perform unit
Part (8) performs the second action；
When described second controls electromagnetic valve (4) and described 3rd control electromagnetic valve (5) dead electricity, institute
State the first control electromagnetic valve (3) and described 4th control electromagnetic valve (6) electric, and handle to
During the second output circuit fuel feeding, described second controls oil-in and the actuator port of electromagnetic valve (4)
Connection, hydraulic oil is entered with actuator port by the described second oil-in controlling electromagnetic valve (3)
Second control chamber (22) of described second proportional reversing valve (2), to drive described second to perform unit
Part (8) performs the 4th action.
System the most according to claim 1 and 2, it is characterised in that
When described first control electromagnetic valve (3), described second control electromagnetic valve (4), the described 3rd
Control electromagnetic valve (5) and described 4th control electromagnetic valve (6) all electric time, described first control
Electromagnetic valve (3), described second control electromagnetic valve (4), described 3rd control electromagnetic valve (5) and
Described 4th controls electromagnetic valve (6) respective actuator port connects with respective oil return opening.
7. a crane, it is characterised in that include arbitrary described being combined of claim 1-6
The control system of action.
8. a control system based on the arbitrary described composite move of claim 1-6 is compound
The control method of action, including:
First controls electromagnetic valve (3), the second control electromagnetic valve (4), the 3rd control electromagnetic valve
(5) and time the 4th controls electromagnetic valve (6) all dead electricity, joystick supplies to the first output circuit
Oil so that hydraulic oil simultaneously enter the first proportional reversing valve (1) first control chamber (11) and
First control chamber (21) of the second proportional reversing valve (2), to drive the first executive component (7)
Perform the first action, and simultaneously drive the second executive component (8) and perform the second action；
First controls electromagnetic valve (3), the second control electromagnetic valve (4), the 3rd control electromagnetic valve
(5) and time the 4th controls electromagnetic valve (6) all dead electricity, joystick supplies to the second output circuit
Oil so that hydraulic oil simultaneously enter the first proportional reversing valve (1) second control chamber (12) and
Second control chamber (22) of the second proportional reversing valve (2), to drive the first executive component (7)
Perform the 3rd action, and simultaneously drive the second executive component (8) execution the 4th action.
Method the most according to claim 8, it is characterised in that also include:
First controls electromagnetic valve (3) and the 4th controls electromagnetic valve (6) dead electricity, the second control electromagnetism
When valve (4) and the 3rd control electromagnetic valve (5) obtain electric, joystick supplies to the first output circuit
Oil, hydraulic oil enters the first control chamber (11) of the first proportional reversing valve (1), to drive first
Executive component (7) performs the first action；Joystick is to the second output circuit fuel feeding, hydraulic oil
Enter the second control chamber (12) of the first proportional reversing valve (1), to drive the first executive component
(7) the 3rd action is performed；
Second controls electromagnetic valve (4) and the 3rd controls electromagnetic valve (5) dead electricity, the first control electromagnetism
When valve (3) and the 4th control electromagnetic valve (6) obtain electric, joystick supplies to the first output circuit
Oil, hydraulic oil enters the first control chamber (21) of the second proportional reversing valve (2), to drive second
Executive component (8) performs the second action；Joystick is to the second output circuit fuel feeding, hydraulic oil
Enter the second control chamber (22) of the second proportional reversing valve (2), to drive the second executive component
(8) the 4th action is performed.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410680616.8A CN104373404B (en) | 2014-11-24 | 2014-11-24 | The control system of composite move and method and crane |
| US15/522,105 US20180319634A1 (en) | 2014-10-30 | 2015-10-30 | Crane hydraulic system and controlling method of the system |
| PCT/CN2015/093293 WO2016066126A1 (en) | 2014-10-30 | 2015-10-30 | Crane hydraulic system and control method based on system |
| BR112017008921-1A BR112017008921B1 (en) | 2014-10-30 | 2015-10-30 | Crane hydraulic system and system control method |
| US17/228,005 US20210229962A1 (en) | 2014-10-30 | 2021-04-12 | Crane hydraulic system and controlling method of the system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410680616.8A CN104373404B (en) | 2014-11-24 | 2014-11-24 | The control system of composite move and method and crane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104373404A CN104373404A (en) | 2015-02-25 |
| CN104373404B true CN104373404B (en) | 2016-12-07 |
Family
ID=52552506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410680616.8A Active CN104373404B (en) | 2014-10-30 | 2014-11-24 | The control system of composite move and method and crane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104373404B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108516467B (en) * | 2018-06-20 | 2019-10-25 | 徐州重型机械有限公司 | The hydraulic control system and hoisting machinery of hoisting machinery |
| CN110925253B (en) * | 2019-12-19 | 2021-11-09 | 三一重机有限公司 | Engineering machinery composite action control method and device |
| CN112963395B (en) * | 2021-02-24 | 2023-08-29 | 三一汽车起重机械有限公司 | Hydraulic system with combined action follow-up control, control method and device and crane |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1297520A (en) * | 1969-11-20 | 1972-11-22 | ||
| JP3232006B2 (en) * | 1996-09-05 | 2001-11-26 | ダイキン工業株式会社 | Control device for vehicle mounted crane |
| CN102079482B (en) * | 2009-11-30 | 2012-11-21 | 徐州重型机械有限公司 | Control method and controller for crane and composite actions thereof of crane |
| CN102358571B (en) * | 2011-10-19 | 2013-07-31 | 四川长江液压件有限责任公司 | Double-pump load hydraulic sensing system |
| CN102889259B (en) * | 2012-09-20 | 2015-05-13 | 三一重工股份有限公司 | Multipath valve and engineering machinery |
| CN104088830B (en) * | 2014-07-30 | 2017-09-19 | 徐州重型机械有限公司 | The hydraulic system and its pilot-operated type control valve of a kind of crane |
-
2014
- 2014-11-24 CN CN201410680616.8A patent/CN104373404B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104373404A (en) | 2015-02-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104373404B (en) | The control system of composite move and method and crane | |
| CN103016438B (en) | A kind of electrohydraulic proportional control valve group | |
| CN104235090B (en) | Negative feedback hydraulic system and rotary drilling rig | |
| CN107429714B (en) | The oil pressure actuated systems of building machinery | |
| CN203532390U (en) | Hydraulic cylinder quick motion loop and engineering machine | |
| CN103244501B (en) | A kind of hydraulic control valve group, hydraulic system and engineering machinery | |
| CN103423221B (en) | Multi-oil-cylinder sequence telescopic hydraulic system and engineering machinery | |
| CN104088837A (en) | Oil cylinder sequential action hydraulic control system and engineering machinery device | |
| CN104806582B (en) | A kind of hydraulic system at engineering machinery Based Intelligent Control interflow | |
| CN108644166B (en) | Electromagnetic hydraulic valve | |
| CN102734501B (en) | Converging multipath valve and crane hydraulic system | |
| CN101676589A (en) | Liquid proportional pressure-reducing valve, valve bank, suspension arm and winding hydraulic pressure control system | |
| CN102155453A (en) | Switching valve and double-motive power closed hydraulic system with switching valve | |
| CN202418066U (en) | Hydraulic system and concrete equipment | |
| CN105782154A (en) | Hydraulic machining machine, hydraulic system thereof and control method of hydraulic system | |
| CN102900719B (en) | Hydraulic switching device, hydraulic system and engineering machinery | |
| CN103511379B (en) | A kind of crane, hydraulic system and switching valve | |
| CN102278331A (en) | Multi-way directional valve for lorry-mounted crane and control method thereof | |
| CN103015483B (en) | Time delay brake system of hydraulic slewing device and engineering machine | |
| CN102434510A (en) | Pumping equipment and high-low pressure switching system of pumping equipment, pumping system and operation method of pumping system | |
| CN204553368U (en) | A kind of hydraulic system of engineering machinery intelligent control interflow | |
| CN104481944B (en) | Depressurizing system and engineering machinery | |
| CN201301975Y (en) | Liquid proportional pressure-reducing valve, valve bank, suspension arm and hoisting hydraulic control system | |
| CN203641145U (en) | Hydraulic block capable of realizing double pistons retreating in conveying system | |
| CN205398040U (en) | Rotary system and electric power operation car |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 221000 Jiangsu city of Xuzhou Province Economic and Technological Development Zone of High Road No. 68 Patentee after: Xuzhou Heavy Machinery Co., Ltd. Address before: 221004 No. 165 Copper Mountain Road, Jiangsu, Xuzhou Patentee before: Xuzhou Heavy Machinery Co., Ltd. |