CN206290513U - A kind of hydraulic synchronization control device of fan-shaped section more changing device - Google Patents
A kind of hydraulic synchronization control device of fan-shaped section more changing device Download PDFInfo
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- CN206290513U CN206290513U CN201621184145.2U CN201621184145U CN206290513U CN 206290513 U CN206290513 U CN 206290513U CN 201621184145 U CN201621184145 U CN 201621184145U CN 206290513 U CN206290513 U CN 206290513U
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Abstract
The utility model is related to a kind of hydraulic synchronization control device of fan-shaped section more changing device, including fan-shaped section more changing device executing agency, controller and double proportioning valve hydraulic synchronization control loops, hydraulic synchronization control device carries out closed-loop control to double proportioning valve hydraulic synchronization control loops and realizes that fan-shaped section more changing device executing agency is synchronized with the movement by controller, and hydraulic synchronization control loop mainly includes hydraulic control one-way valve, pressure compensator, proportioning valve, solenoid directional control valve, balanced valve, shuttle valve and safety valve.The utility model has the advantage of：Control is synchronized to the guiding swing arm deflection angle of the fan-shaped section more changing device left and right sides by double proportioning valves, so as to control to be oriented to the lifting positioning that swing arm adapts to different fan-shaped sections, the lifting of each section of continuous casting machine fan-shaped segment can quick, be smoothly realized, is changed and is adjusted, ensure that fan-shaped section is changed safe, steady and reliable, and improve the automatization level of fan-shaped section Renewal process, it is adaptable to the Automated condtrol of fan-shaped sections of slab continuous more changing device.
Description
Technical field
The utility model belongs to field of metallurgical machine, is related to a kind of hydraulic synchronization control device of fan-shaped section more changing device.
Background technology
Fan-shaped section is one of nucleus equipment of slab caster, the raising of the quality, production efficiency of slab quality, maintenance speed
Speed of degree etc. is often depending on this equipment component.Fan-shaped section is one of equipment that frequent replacing is needed in conticaster, every company
Casting machine is required for being equipped with special fan-shaped section more changing device, so that fan-shaped section safe, quickly, can be changed smoothly, to shorten
The maintenance period of conticaster, improve production efficiency improves slab quality.
Existing fan-shaped section more changing device mostly synchronizes control using digital ratio equation valve loop or flow speed control valve loop.Digital ratio
The shortcoming in example valve loop is two control oil of oscillating motor from a loop fuel feeding, when load injustice occur in two hydraulic cylinders
During weighing apparatus, synchronous effect is poor；Although and two, flow speed control valve loop hydraulic cylinder is solved laod unbalance and is asked by different circuit fuel feeding
Topic, but after flow speed control valve one is set, speed is constant in the process of running for hydraulic cylinder, causes fan-shaped section hoisting process to impact larger,
Operation is unstable.
To solve the deficiency of above-mentioned traditional control loop, it is ensured that fan-shaped section hoisting process safety and steady, Hoisting Position is accurate
Adjustable, the utility model is directed to fan-shaped section more changing device, proposes a kind of pair of proportioning valve hydraulic synchronization control device, realizes sector
The section more changing device left and right sides is oriented to the synchronous closed-loop control of swing arm deflection angle, so as to control to be oriented to the different sectors of swing arm adaptation
Section change bit, can quick, smoothly realize the lifting of each section of fan-shaped sections of slab continuous, change and adjust, it is ensured that fan-shaped section
The security reliability of replacing, and improve the automatization level of fan-shaped section Renewal process.
The content of the invention
In view of this, the purpose of this utility model is the hydraulic synchronization control dress for providing a kind of fan-shaped section more changing device
Put, solve the problems, such as that fan-shaped section changes the Synchronization Control of device guiding swing arm, realize fan-shaped section more changing device and hung in fan-shaped section
The Position location accuracy of dress process, safety and steady, lifting reliability and change rapidity, improve fan-shaped section Renewal process from
Dynamicization level.The present invention is applicable not only to the hydraulic synchronization control of fan-shaped section more changing device, while being also applied for similar operating mode
Other equipments.
To reach above-mentioned purpose, the utility model provides following technical scheme：A kind of hydraulic pressure of fan-shaped section more changing device is same
Step control device, including fan-shaped section more changing device executing agency, controller and double proportioning valve hydraulic synchronization control loops, the liquid
Pressure sync control device carries out closed-loop control to double proportioning valve hydraulic synchronization control loops and realizes that fan-shaped section is changed by controller
Device executing agency is synchronized with the movement.
The fan-shaped section more changing device executing agency is made up of oscillating motor, guiding swing arm and lifting beam, swings hydraulic pressure
The output end of cylinder is connected with the one end for being oriented to swing arm, and the other end for being oriented to swing arm is connected with lifting beam.
The oscillating motor is two-stage hydraulic cylinder, and prison is respectively provided with guiding swing arm and lifting beam junction
Encoder from conduct to swing arm deflection angle, the signal output part of encoder is connected with controller signals input.
Described pair of proportioning valve hydraulic synchronization control loop is changed including proportioning valve, pressure compensator, hydraulic control one-way valve and electromagnetism
To valve, the front and rear pressure difference that guaranteed proportioning valve is set between the pressure oil-in of proportioning valve and pressure oil export is the pressure of steady state value
Force compensating device, hydraulic control one-way valve is set in the inlet circuit of proportioning valve, and hydraulic control one-way valve, electricity are set in the outlet loop of proportioning valve
Magnetic reversal valve is connected with hydraulic control one-way valve respectively, and controls its break-make, and solenoid directional control valve is connected with hydraulic control one-way valve respectively, and controls
Its break-make is made, the control end of proportioning valve and the control end of solenoid directional control valve are connected with controller respectively.
Pressure-reducing valve P mouthfuls of the pressure compensator is connected with P mouthfuls of pressure oil, pressure-reducing valve A mouthfuls of the pressure compensator
P mouthfuls with proportioning valve is connected, and A, B hydraulic fluid port of the proportioning valve are connected with two hydraulic fluid ports of the shuttle valve of pressure compensator respectively.
The balanced valve of the stationarity of guaranteed fan-shaped section hoisting process is set on the rodless cavity loop of the oscillating motor,
The shuttle valve of optional balanced valve control-oil pressure is provided with the rod chamber loop of the oscillating motor.
The guarantee non-overloading peace of oscillating motor rodless cavity is additionally provided with the rodless cavity loop of the oscillating motor
Full valve.
The beneficial effects of the utility model are：
1st, the utility model adoption rate valve carries out closed-loop control to the deflection angle of fan-shaped section more changing device, solves tradition
The problem of synchronous poor performance, solves traditional flow speed control valve loop hoisting process uneven under digital ratio equation valve control system laod unbalance
Steady problem, improves the synchronization accuracy that fan-shaped section more changing device both sides are oriented to swing arm, while realizing fan-shaped section hoisting process
Safety and steady and Position location accuracy；
2nd, the utility model solves conventional cylinder installation using two-stage hydraulic cylinder as the driving oil cylinder for being oriented to swing arm
The excessive problem in space, advantage is provided for fan-shaped section more changing device is applied to reforming continuous casting machine engineering.
3rd, the utility model sets balanced valve and safety valve in the rodless cavity of oscillating motor, has bar in oscillating motor
Chamber sets the control oil of shuttle valve selection balanced valve, realizes stationarity, security and the synchronism of fan-shaped section hoisting process.
Brief description of the drawings
In order that the purpose of this utility model, technical scheme and beneficial effect are clearer, the utility model provides as follows
Accompanying drawing is illustrated：
Fig. 1 is the structural representation of the hydraulic synchronization control device of the utility model fan-shaped section more changing device；
Wherein, 1.1,1.2,1.3,1.4-hydraulic control one-way valve, 2.1,2.2-pressure compensator, 3.1,3.2-proportioning valve,
4.1st, 4.2-solenoid directional control valve, 5-shuttle valve, 6.1,6.2-balanced valve, 7.1,7.2-safety valve, 8.1,8.2-swing hydraulic pressure
Cylinder, 9.1,9.2-it is oriented to swing arm, 10.1,10.2-encoder, 11-lifting beam, 12-controller.
Specific embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail.
A kind of hydraulic synchronization control device of fan-shaped section more changing device, including fan-shaped section more changing device executing agency, control
Device 12 and double proportioning valve hydraulic synchronization control loops, the hydraulic synchronization control device is by the double proportioning valve hydraulic pressure of controller 12 pairs
Synchronizing control loop carries out closed-loop control and realizes being synchronized with the movement for fan-shaped section more changing device executing agency.
The fan-shaped section more changing device executing agency is oriented to swing arm 9.1,9.2 and lifting beam by oscillating motor 8.1,8.2
11 compositions, the output end of oscillating motor 8.1,8.2 is connected with the one end for being oriented to swing arm 9.1,9.2, is oriented to swing arm 9.1,9.2
The other end is connected with lifting beam 11.
The oscillating motor 8.1,8.2 is two-stage hydraulic cylinder, is connected with lifting beam 11 in guiding swing arm 9.1,9.2
Place is respectively provided with monitoring and is oriented to swing arm 9.1, the encoder 10.1,10.2 of 9.2 deflection angles, encoder 10.1,10.2
Signal output part is connected with the signal input part of controller 12.
Described pair of proportioning valve hydraulic synchronization control loop includes proportioning valve 3.1,3.2, pressure compensator 2.1,2.2, hydraulic control
Check valve 1.1,1.2,1.3,1.4 and solenoid directional control valve 4.1,4.2, the pressure oil-in of proportioning valve 3.1,3.2 and pressure oil go out
The front and rear pressure difference that guaranteed proportioning valve 3.1,3.2 is set between mouthful is the pressure compensator 2.1,2.2 of steady state value, in proportioning valve
3.1st, 3.2 inlet circuit sets hydraulic control one-way valve 1.1,1.3, and fluid-control one-way is set in the outlet loop of proportioning valve 3.1,3.2
Valve 1.2,1.4, solenoid directional control valve 4.1 is connected with hydraulic control one-way valve 1.1,1.2 respectively, and controls its break-make, solenoid directional control valve 4.2
It is connected with hydraulic control one-way valve 1.3,1.4 respectively, and controls its break-make, the control end and solenoid directional control valve of proportioning valve 3.1,3.2
4.1st, 4.2 control end is connected with controller 12 respectively.
Pressure-reducing valve P mouthfuls of the pressure compensator 2.1,2.2 is connected with P mouthfuls of pressure oil, the pressure compensator 2.1,
Pressure-reducing valve A mouthfuls of 2.2 is connected with P mouthfuls of proportioning valve 3.1,3.2, and A, B hydraulic fluid port of the proportioning valve 3.1,3.2 are mended with pressure respectively
Repay two hydraulic fluid ports connection of the shuttle valve of device 2.1,2.2.Three hydraulic fluid ports of solenoid directional control valve 4.1,4.2 connect respectively pressure oil pipe P,
Hydraulic control one-way valve 1.1,1.2,1.3,1.4 and oil return pipe T, P mouthfuls and A mouthfuls of hydraulic control one-way valve 1.2,1.4 connect proportioning valve respectively
3.1st, P mouthfuls of B mouthfuls of 3.2 and balanced valve 6.1,6.2, X mouthfuls of the control oil of hydraulic control one-way valve 1.2,1.4 respectively with solenoid directional control valve
4.1st, 4.2 B mouthfuls of connection, Leakage Energy Y mouthfuls of hydraulic control one-way valve 1.2,1.4 is connected with drain pipeline L respectively,
The stationarity of guaranteed fan-shaped section hoisting process is set on the rodless cavity loop of the oscillating motor 8.1,8.2
Balanced valve 6.1,6.2, the A mouthfuls of rodless cavity of connection oscillating motor 8.1,8.2 of balanced valve 6.1,6.2, in the swing hydraulic pressure
Be provided with the shuttle valve 5 of optional balanced valve 6.1,6.2 control-oil pressures on the rod chamber loop of cylinder 8.1,8.2, shuttle valve 5 respectively from
The rod chamber of oscillating motor 8.1,8.2 draws control oil, and control balanced valve 6.1,6.2 is selected by pressure.
Guarantee oscillating motor 8.1,8.2 nothings are additionally provided with the rodless cavity loop of the oscillating motor 8.1,8.2
The non-overloading safety valve 7.1,7.2 of rod cavity, safety valve 7.1,7.2 is connected with oil return pipe T, it is ensured that oscillating motor 8.1,8.2 nothings
Rod cavity non-overloading.Controller 12 sends control instruction extremely according to the feedback deflection angle of technological requirement and encoder 10.1,10.2
The control oscillating motor 8.1,8.2 of proportioning valve 3.1,3.2 is synchronized and stretched out or retraction movement, realizes that fan-shaped section more changes the outfit successively
Put to first paragraph to the 7th section of lifting of fan-shaped section, every section of fan-shaped section hoisting process is as follows：
The action process lifted during fan-shaped section more changing device lifting fan-shaped section：Controller 12 is according to encoder 10.1,10.2
The deflection angle of feedback determines the current Hoisting Position of fan-shaped section more changing device, then new according to determined by new Hoisting Position
Deflection angle, the synchronized control algolithm of controller 12 calculates control instruction and is sent to proportioning valve 3.1,3.2, proportioning valve 3.1,
P mouthfuls of 3.2 and B mouthfuls of conducting, while solenoid directional control valve 4.1,4.2 must conduct the hydraulic control list opened before and after proportioning valve 3.1,3.2
To valve 1.1,1.2,1.3,1.4, pressure oil pipe P intraoral pressure oil is successively through hydraulic control one-way valve 1.1,1.3, pressure compensator
2.1st, 2.2, proportioning valve 3.1,3.2, hydraulic control one-way valve 1.2,1.4, balanced valve 6.1,6.2 enters oscillating motor 8.1,8.2
Rodless cavity；The fluid of the rod chamber of oscillating motor 8.1,8.2 flows back to oil return pipe T through T mouthfuls of proportioning valve 3.1,3.2 simultaneously；When
Power and when making a concerted effort of gravity load that the power that rodless cavity is produced is produced more than rod chamber, the first order of oscillating motor 8.1,8.2
Piston rod stretches out and is swung up with action-oriented swing arm 9.1,9.2 synchronizations, connects when encoder 10.1,10.2 detects deflection angle
Needed for nearly fan-shaped section during angle, controller 12 is gradually reduced during control instruction is sent to proportioning valve 3.1,3.2 until it is switched to
Median function, while solenoid directional control valve 4.1,4.2 dead electricity close hydraulic control one-way valve 1.1,1.2,1.3,1.4, in balanced valve 6.1,6.2
In the presence of be steadily parked in current location；As encoder 10.1,10.2 detects angle needed for deflection angle is less than fan-shaped section, then
First order piston rod continues to stretch out, and such as stretches out and does not reach required angle when to the end yet, then second level piston rod continues to stretch out, directly
Angle to needed for being oriented to the deflection angle of swing arm 9.1,9.2 close to fan-shaped section lifting, controller 12 is gradually reduced control instruction
Proportioning valve 3.1,3.2 is sent to up to it switches to Median Function, while solenoid directional control valve 4.1,4.2 dead electricity close fluid-control one-way
Valve 1.1,1.2,1.3,1.4, steadily current location is parked in the presence of balanced valve 6.1,6.2.In the process, pressure compensation
The setting pressure difference of device 2.1,2.2 is constant, therefore proportioning valve 3.1,3.2 ensure that two ratios under identical opening degree instruction condition
The uniformity of valve loop output flow, thus ensure two oscillating motors to stretch out speed consistent without by outer load effect；
When encoder 10.1,10.2 detect deflection angle it is inconsistent when, then controller 12 synchronization control algorithm input, correct ratio
The command signal of valve 3.1,3.2, until encoder 10.1,10.2 to detect deflection angle consistent；Simultaneously in oscillating motor
8.1st, 8.2 process of stretching out has acceleration and deceleration process, it is ensured that the stationarity of hoisting process.
The action process fallen during fan-shaped section more changing device lifting fan-shaped section：Controller 12 is anti-according to encoder 8.1,8.2
The deflection angle of feedback determines the current Hoisting Position of fan-shaped section more changing device, then new inclined according to determined by new Hoisting Position
Swinging, controller 12 gradually increases control control instruction and is sent to proportioning valve 3.1,3.2, P mouthfuls and A of proportioning valve 3.1,3.2
Mouthful conducting, while solenoid directional control valve 4.1,4.2 must conduct open proportioning valve 3.1,3.2 before and after hydraulic control one-way valve 1.1,1.2,
1.3rd, 1.4, the pressure oil in pressure oil pipe P is successively through hydraulic control one-way valve 1.1,1.3, pressure compensator 2.1,2.2, proportioning valve
3.1st, 3.2 enter the rod chamber of oscillating motor 8.1,8.2；When the power of rod chamber generation and making a concerted effort less than without bar for gravity load
Chamber produce power when, because the effect oscillating motor 8.1,8.2 of balanced valve is failure to actuate, until oscillating motor 8.1,8.2 its
In power for the rod chamber side of hydraulic cylinder and load gravity the power made a concerted effort more than rodless cavity side when, the selection rod chamber of shuttle valve 5
, used as control oil, while balanced valve 6.1,6.2 is switched into throttling position, the pressure oil of rodless cavity is successively through balanced valve for pressure person high
6.1st, 6.2, hydraulic control one-way valve 1.2,1.4, proportioning valve 3.1,3.2 flows back to oil return pipe T；Now the of oscillating motor 8.1,8.2
Second piston rod retract with action-oriented swing arm 9.1,9.2 synchronizations to lower swing, when encoder 10.1,10.2 detects deflection angle
Close to needed for fan-shaped section during angle, controller 12 is gradually reduced control instruction and is sent to proportioning valve 3.1,3.2 until it switches degree
To Median Function, while solenoid directional control valve 4.1,4.2 dead electricity close hydraulic control one-way valve 1.1,1.2,1.3,1.4, in balanced valve
6.1st, steadily current location is parked in the presence of 6.2；Deflection angle is detected such as encoder 10.1,10.2 more than needed for fan-shaped section
Angle, then second level piston rod continuation is retracted, and required angle is not reached when to the end yet as retracted, then the continuation of first order piston rod
Retract, until being oriented to the deflection angle of swing arm 9.1,9.2 close to the required angle of fan-shaped section lifting, controller 12 is gradually reduced control
Instruction processed is sent to proportioning valve 3.1,3.2 up to it switches to Median Function, while solenoid directional control valve 4.1,4.2 dead electricity close liquid
Control check valve 1.1,1.2,1.3,1.4, steadily current location is parked in the presence of balanced valve 6.1,6.2.In the process, press
The setting pressure difference of force compensating device 2.1,2.2 is constant, therefore proportioning valve 3.1,3.2 ensure that two under identical opening degree instruction condition
The uniformity of individual proportioning valve loop output flow, so as to ensure that two retraction speeds of oscillating motor are consistent without by outer load
Influence；When encoder 10.1,10.2 detect deflection angle it is inconsistent when, then controller 12 synchronization control algorithm input, repair
The command signal of direct proportion valve 3.1,3.2, until encoder 10.1,10.2 to detect deflection angle consistent；Swinging liquid simultaneously
The retraction process of cylinder pressure 8.1,8.2 has acceleration and deceleration process, it is ensured that the stationarity of hoisting process.
Finally illustrate, preferred embodiment above is only used to illustrate the technical solution of the utility model and unrestricted, to the greatest extent
Pipe is described in detail by above preferred embodiment to the utility model, but those skilled in the art should manage
Solution, can make various changes, without departing from the utility model claims institute to it in the form and details
The scope of restriction.
Claims (7)
1. the hydraulic synchronization control device of a kind of fan-shaped section more changing device, it is characterised in that：Performed including fan-shaped section more changing device
Mechanism, controller (12) and double proportioning valve hydraulic synchronization control loops, the hydraulic synchronization control device pass through controller (12)
Double proportioning valve hydraulic synchronization control loops are carried out with closed-loop control and realizes that fan-shaped section more changing device executing agency is synchronized with the movement.
2. the hydraulic synchronization control device of fan-shaped section according to claim 1 more changing device, it is characterised in that：The sector
Duan Geng changing devices executing agency is made up of oscillating motor (8.1,8.2), guiding swing arm (9.1,9.2) and lifting beam (11), puts
The output end of hydrodynamic cylinder pressure (8.1,8.2) is connected with the one end for being oriented to swing arm (9.1,9.2), is oriented to the another of swing arm (9.1,9.2)
One end is connected with lifting beam (11).
3. the hydraulic synchronization control device of fan-shaped section according to claim 2 more changing device, it is characterised in that：The swing
Hydraulic cylinder (8.1,8.2) is two-stage hydraulic cylinder, is respectively equipped with lifting beam (11) junction in guiding swing arm (9.1,9.2)
The encoder (10.1,10.2) of swing arm (9.1,9.2) deflection angle, the signal of encoder (10.1,10.2) are oriented to for monitoring
Output end is connected with controller (12) signal input part.
4. the hydraulic synchronization control device of the fan-shaped section more changing device according to claim 1,2 or 3, it is characterised in that：Institute
Stating double proportioning valve hydraulic synchronization control loops includes proportioning valve (3.1,3.2), pressure compensator (2.1,2.2), hydraulic control one-way valve
(1.1,1.2,1.3,1.4) and solenoid directional control valve (4.1,4.2), the pressure oil-in of proportioning valve (3.1,3.2) and pressure oil go out
The front and rear pressure difference that guaranteed proportioning valve (3.1,3.2) is set between mouthful is the pressure compensator (2.1,2.2) of steady state value, in ratio
The inlet circuit of valve (3.1,3.2) sets hydraulic control one-way valve (1.1,1.3), is set in the outlet loop of proportioning valve (3.1,3.2)
Hydraulic control one-way valve (1.2,1.4), solenoid directional control valve (4.1) is connected with hydraulic control one-way valve (1.1,1.2) respectively, and controls it to lead to
Disconnected, solenoid directional control valve (4.2) is connected with hydraulic control one-way valve (1.3,1.4) respectively, and controls its break-make, proportioning valve (3.1,3.2)
Control end and the control end of solenoid directional control valve (4.1,4.2) be connected with controller (12) respectively.
5. the hydraulic synchronization control device of fan-shaped section according to claim 4 more changing device, it is characterised in that：The pressure
Pressure-reducing valve P mouthfuls of compensator (2.1,2.2) is connected with P mouthfuls of pressure oil, the pressure-reducing valve A of the pressure compensator (2.1,2.2)
Mouthful be connected with P mouthfuls of proportioning valve (3.1,3.2), A, B hydraulic fluid port of the proportioning valve (3.1,3.2) respectively with pressure compensator
Two hydraulic fluid ports connection of the shuttle valve of (2.1,2.2).
6. the hydraulic synchronization control device of the more changing device of the fan-shaped section according to Claims 2 or 3, it is characterised in that：It is described
The balanced valve of the stationarity of guaranteed fan-shaped section hoisting process is set on the rodless cavity loop of oscillating motor (8.1,8.2)
(6.1,6.2), are provided with optional balanced valve (6.1,6.2) on the rod chamber loop of the oscillating motor (8.1,8.2)
The shuttle valve (5) of control-oil pressure.
7. the hydraulic synchronization control device of the more changing device of the fan-shaped section according to Claims 2 or 3, it is characterised in that：Institute
Guarantee oscillating motor (8.1,8.2) rodless cavity is additionally provided with the rodless cavity loop for stating oscillating motor (8.1,8.2) not surpass
The safety valve (7.1,7.2) of load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621184145.2U CN206290513U (en) | 2016-11-03 | 2016-11-03 | A kind of hydraulic synchronization control device of fan-shaped section more changing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621184145.2U CN206290513U (en) | 2016-11-03 | 2016-11-03 | A kind of hydraulic synchronization control device of fan-shaped section more changing device |
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| CN206290513U true CN206290513U (en) | 2017-06-30 |
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| CN201621184145.2U Active CN206290513U (en) | 2016-11-03 | 2016-11-03 | A kind of hydraulic synchronization control device of fan-shaped section more changing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106286443A (en) * | 2016-11-03 | 2017-01-04 | 中冶赛迪工程技术股份有限公司 | A kind of hydraulic synchronization control device of fan-shaped section more changing device |
| CN111022406A (en) * | 2019-12-27 | 2020-04-17 | 浙江三一装备有限公司 | Hydraulic locking structure, hydraulic system and engineering machinery |
-
2016
- 2016-11-03 CN CN201621184145.2U patent/CN206290513U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106286443A (en) * | 2016-11-03 | 2017-01-04 | 中冶赛迪工程技术股份有限公司 | A kind of hydraulic synchronization control device of fan-shaped section more changing device |
| CN111022406A (en) * | 2019-12-27 | 2020-04-17 | 浙江三一装备有限公司 | Hydraulic locking structure, hydraulic system and engineering machinery |
| CN111022406B (en) * | 2019-12-27 | 2021-09-17 | 浙江三一装备有限公司 | Hydraulic locking structure, hydraulic system and engineering machinery |
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