CN105271050B - It is a kind of that there is the anti-oil cylinder hydraulic drive system for being emptied function - Google Patents
It is a kind of that there is the anti-oil cylinder hydraulic drive system for being emptied function Download PDFInfo
- Publication number
- CN105271050B CN105271050B CN201510830703.1A CN201510830703A CN105271050B CN 105271050 B CN105271050 B CN 105271050B CN 201510830703 A CN201510830703 A CN 201510830703A CN 105271050 B CN105271050 B CN 105271050B
- Authority
- CN
- China
- Prior art keywords
- valve
- oil
- fluid port
- hydraulic fluid
- support
- 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
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
There is the anti-oil cylinder hydraulic drive system for being emptied function, including fuel tank, four jacking cylinders, four support cylinders, four groups of jackings and support hydraulic pressure subsystem the invention discloses a kind of；Include in every group of jacking and support hydraulic pressure subsystem by the duplex pump of buncher driving, two-bit triplet magnetic valve, proportional pressure control valve, the first solenoid directional control valve, the second solenoid directional control valve, the first stop valve, the second stop valve, the 3rd stop valve, the first balanced valve, the second balanced valve, the 3rd balanced valve, the 4th balanced valve, accumulator.The present invention, which can realize, is smoothly lifted to super large jumbo in flat surface from ground, and has the advantages of jacking cylinder avoids the occurrence of emptying phenomenon when following motion.
Description
Technical field
The present invention relates to a kind of hydraulic test, more particularly to a kind of there is the anti-oil cylinder hydraulic drive system for being emptied function.
Background technology
In impeller dynamic test, one of them important test event is that flow deflector is placed into ultra-large type water tank to carry out
Test.The water tank of this ultra-large type, it is wide 3 meters, it is long 6 meters, weighed in the case where storing full water 132 tons.In test process, water tank
It may require that in the flat surface from surface uplift to 3.2m and fallen after rise from flat surface to ground, and this span is big and heavy
Water tank from surface uplift to plane on be very difficult thing, and require during lifting, water tank is not allow for offseting, no
Then water tank will be blocked by track, can not continue lifting, or even can cause the damage of water tank.
Later, someone expected being lifted the lifting of this super large jumbo using screw body.Although utilize screw mandrel machine
Structure, which carries out lifting, has the advantages of precision is high, and super large jumbo can be avoided not shifted during lifting, but silk
The power that linkage can be provided is limited, it is impossible to reaches the power needed for lifting super large jumbo, therefore, finally utilizes screw body
Carrying out this super large jumbo of lifting still can not realize.
Later, applicant was expected using the mode of hydraulic pressure come this super large jumbo of lifting, to realize jacking and support,
Need to use jacking cylinder and support cylinder, but when support cylinder works, jacking cylinder can follow motion.And jacking cylinder
Emptying phenomenon occurs when following motion.
The content of the invention
In order to solve the above technical problems, the present invention provides a kind of oil cylinder hydraulic drive system for having and preventing being emptied function, lead to
The mode of hydraulic pressure is crossed to lift super large jumbo, to overcome the shortcomings of the prior art.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：
It is a kind of that there is the anti-oil cylinder hydraulic drive system for being emptied function, it is characterised in that：
Including fuel tank, four jacking cylinders, four support cylinders and four groups of jackings and support hydraulic pressure subsystem；
Include duplex pump, the two-bit triplet electromagnetism by buncher driving in every group of jacking and support hydraulic pressure subsystem
Valve, proportional pressure control valve, the first solenoid directional control valve, the second solenoid directional control valve, the first stop valve, the second stop valve, the 3rd stop valve,
First balanced valve, the second balanced valve, the 3rd balanced valve, the 4th balanced valve, accumulator；
The oil inlet of the duplex pump is connected to the fuel tank, and the oil-out of the main oil pump of the duplex pump is connected to described
First hydraulic fluid port of two-bit triplet magnetic valve, the second hydraulic fluid port of the two-bit triplet magnetic valve connect the oil inlet of the first check valve；
The oil-out of the auxiliary oil pump of the duplex pump is directly connected to the oil inlet of first check valve, and described first is single
The oil inlet of the proportional pressure control valve, the first hydraulic fluid port of first solenoid directional control valve, institute are connected respectively to the oil-out of valve
State the first hydraulic fluid port of the second solenoid directional control valve；
Second hydraulic fluid port of first solenoid directional control valve is connected to the reverse hydraulic fluid port of jacking cylinder through first balanced valve,
3rd hydraulic fluid port of first solenoid directional control valve is connected to the positive hydraulic fluid port of the jacking cylinder through second balanced valve；It is described
First balanced valve is also connected to the oil inlet of first stop valve；Second balanced valve is also connected to second stop valve
Oil inlet；
Second hydraulic fluid port of second solenoid directional control valve is connected to the reverse hydraulic fluid port of support cylinder through the 3rd balanced valve,
3rd hydraulic fluid port of second solenoid directional control valve is connected to the positive hydraulic fluid port of support cylinder through the 4th balanced valve；Described 4th
Balanced valve is also connected to accumulator by the 3rd stop valve；
3rd hydraulic fluid port of jacking and the two-bit triplet magnetic valve in support hydraulic pressure subsystem, the ratio described in four groups
The oil-out of overflow valve, the 4th hydraulic fluid port of first solenoid directional control valve, the 4th hydraulic fluid port, described of second solenoid directional control valve
The oil-out of first stop valve, the oil-out of second stop valve connect back to the fuel tank by return line.
In the above-mentioned technical proposal of the present invention, the first stop valve and the second stop valve are generally in cut-off state, work as branch
When support oil cylinder is operated, because jacking cylinder will also follow motion, at this moment because the first solenoid directional control valve is in cut-off shape
State, to avoid jacking cylinder from emptying phenomenon occur, need to open the first stop valve and the second stop valve for this so that jacking cylinder
Connected with fuel tank, so as to avoid emptying phenomenon.
In the present invention, the oil-out of first check valve is connected with the first charge oil pressure sensor；The jacking oil
Cylinder has jacking cylinder displacement transducer；The oil-out of first balanced valve and the oil-out of the second balanced valve are connected to
Jack first pressure sensor and jacking second pressure sensor；On the support cylinder have support cylinder displacement transducer and
Support cylinder gravity sensor；The oil-out of 3rd balanced valve and the oil-out of the 4th balanced valve are connected to branch
Support first pressure sensor and support second pressure sensor.
In the present invention, cooler and filter are serially connected with the position close to fuel tank on the return line.
The fuel tank has liquid level gauge, liquid level relay, air filter and temperature sensor.
The 4th stop valve is also associated between return line before the fuel tank and the entrance cooler.
Using above-mentioned technical proposal, the present invention can realize smoothly is lifted to flat surface by super large jumbo from ground
On, and there is the advantages of jacking cylinder avoids the occurrence of emptying phenomenon when following motion.
Brief description of the drawings
The present invention is described in detail with reference to the accompanying drawings and detailed description：
Fig. 1 is the hydraulic schematic of the present invention.
Embodiment
As shown in figure 1, the present invention's has the anti-oil cylinder hydraulic drive system for being emptied function, including 1, four jacking of fuel tank
20, four support cylinders 21 of oil cylinder, four groups of jackings and support hydraulic pressure subsystem 201,202,203,204.Four jacking cylinders 20
It is used to jack super large jumbo at four angles of super large jumbo；Four support cylinders 21 are placed on flat surface
On, it is used to support super large jumbo after super large jumbo is jacked to flat surface.
Include the duplex pump 8 driven by buncher 7, two-bit triplet electricity in every group of jacking and support hydraulic pressure subsystem
Magnet valve 32, proportional pressure control valve 12, the first solenoid directional control valve 161, the second solenoid directional control valve 162,311, second sections of the first stop valve
Only valve 312, the 3rd stop valve 313, the first balanced valve 291, the second balanced valve 292, the 3rd balanced valve 293, the 4th balanced valve
294, accumulator 26.
Wherein, the oil inlet of duplex pump 8 is connected to fuel tank 1, the oil-out of the main oil pump of duplex pump 8 through the first ball valve 151
The first hydraulic fluid port of two-bit triplet magnetic valve 32 is connected to, the second hydraulic fluid port of two-bit triplet magnetic valve 32 connects the first check valve 111
Oil inlet.
The oil-out of the auxiliary oil pump of duplex pump 8 is directly connected to the oil inlet of the first check valve 111, the first check valve 111
Oil-out be connected respectively to the oil inlet of proportional pressure control valve 12, the first hydraulic fluid port of the first solenoid directional control valve 161, the second electromagnetism and change
To the first hydraulic fluid port of valve 162.
The oil-out of first check valve 111 is also associated with the first charge oil pressure sensor 141 and pressure gauge 17.
Second hydraulic fluid port of the first solenoid directional control valve 161 is connected to the reverse hydraulic fluid port of jacking cylinder through the first balanced valve 291, the
3rd hydraulic fluid port of one solenoid directional control valve 161 is connected to the positive hydraulic fluid port of jacking cylinder through the second balanced valve 292.First balanced valve
291 are also connected to the oil inlet of the first stop valve 311.Second balanced valve 292 is also connected to the oil inlet of the second stop valve 312.
Jacking cylinder 20 has jacking displacement transducer 301.The oil-out of the oil-out of first balanced valve 291 and the second balanced valve 292
It has been also respectively connected with jacking first pressure sensor 142 and jacking second pressure sensor 143.
Second hydraulic fluid port of the second solenoid directional control valve 162 is connected to the reverse hydraulic fluid port of support cylinder 21 through the 3rd balanced valve 293,
3rd hydraulic fluid port of the second solenoid directional control valve 162 is connected to the positive hydraulic fluid port of support cylinder 21 through the 4th balanced valve 294.4th balance
Valve 294 is also connected to accumulator 26 by the 3rd stop valve 313.With bracing displacement sensor 302 and again on support cylinder 21
Force snesor 303.The oil-out of 3rd balanced valve 293 and the oil-out of the 4th balanced valve have been also respectively connected with support first pressure
Sensor 144 and support second pressure sensor 145.
Four groups of jackings and the 3rd oil of the two-bit triplet magnetic valve 32 in support hydraulic pressure subsystem 201,202,203,204
Mouth, the oil-out of proportional pressure control valve 12, the 4th hydraulic fluid port of the first solenoid directional control valve 161, the 4th oil of the second solenoid directional control valve 162
Mouth, the oil-out of the first stop valve 311, the oil-out of the second stop valve 312 pass through return line and connect oil return box 1.
In the present invention, the magnetic valve of duplex pump 8 must not be electric, and only main oil pump works；Magnetic valve obtains electric, main oil pump and pair oil
Pump works simultaneously.
Jacking and the working method of support hydraulic pressure subsystem are：Buncher 7 drives duplex pump 8 to work, and works as two-bit triplet
First hydraulic fluid port of magnetic valve 31 and the connection of the second hydraulic fluid port, the main oil pump and auxiliary oil pump of duplex pump 8 pass through the first check valve 111 simultaneously
To jacking and support hydraulic pressure subsystem fuel feeding, when the first hydraulic fluid port of two-bit triplet magnetic valve 31 and the second hydraulic fluid port end, first is oily
When mouth connects with the 3rd hydraulic fluid port, only the auxiliary oil pump of duplex pump 8 is supplied by the first check valve 111 to jacking and support hydraulic pressure subsystem
Oil, the main oil pump of duplex pump 8 then flow back to fuel tank 1 by the first hydraulic fluid port and the 3rd hydraulic fluid port of two-bit triplet magnetic valve 31.
Proportional pressure control valve 12 is then used to realize the pressure for changing the hydraulic oil for entering jacking and support hydraulic pressure subsystem.
When the first solenoid directional control valve 161 is being connected, for driving jacking cylinder 20 to work, at this moment the second electromagnetic switch is electric
Magnet valve 162 ends, and support cylinder 21 does not work.When the second electromagnetic switch magnetic valve 162 is being connected, for driving support cylinder
21 work, at this moment the first solenoid directional control valve 161 ends, and jacking cylinder 20 does not work.
First solenoid directional control valve 161 has two kinds of getting types：When the first hydraulic fluid port of the first solenoid directional control valve 161 and the second oil
When mouth connection, the 3rd hydraulic fluid port and the 4th hydraulic fluid port connect, hydraulic oil then enters from the reverse hydraulic fluid port of jacking cylinder 20, and driving jacks oil
Cylinder 20 shortens, for the water tank 1100 that lands.When the first hydraulic fluid port of the first solenoid directional control valve 161 and the 3rd hydraulic fluid port connect, second is oily
When mouth connects with the 4th hydraulic fluid port, hydraulic oil then enters from the positive hydraulic fluid port of jacking cylinder 20, and driving jacking cylinder 20 extends, and is used for
Water tank is jacked up.
Second solenoid directional control valve 162 also has two kinds of getting types：When the first hydraulic fluid port and second of the first solenoid directional control valve 162
Hydraulic fluid port connects, and when the 3rd hydraulic fluid port and the 4th hydraulic fluid port connect, hydraulic oil then enters from the reverse hydraulic fluid port of support cylinder 21, driving support
Oil cylinder 21 shortens, for being separated with water tank.When the first hydraulic fluid port of the first solenoid directional control valve 162 and the 3rd hydraulic fluid port connect, second is oily
When mouth connects with the 4th hydraulic fluid port, hydraulic oil then enters from the positive hydraulic fluid port of support cylinder 21, and driving support cylinder 21 extends, and is used for
Support water tank.
3rd stop valve 313 is generally in cut-off state, after support cylinder 21 supports water tank, by the 3rd stop valve
313 open connection so that carry out pressurize to support cylinder 21 using accumulator 26.
First stop valve 311 and the second stop valve 312 are generally also in cut-off state, when support cylinder 21 is operated
When, because jacking cylinder 20 will also follow motion, at this moment because the first solenoid directional control valve 161 is in cut-off state, to avoid
There is emptying phenomenon in jacking cylinder 20, needs to open the first stop valve 311 and the second stop valve 312 for this so that jacking cylinder
20 connect with fuel tank 1, avoid emptying phenomenon.
On return line cooler 23 and filter 24 are serially connected with close to the position of fuel tank 1.
Fuel tank 1 has liquid level gauge 3, liquid level relay 4, air filter 5 and temperature sensor 6.
In addition, the second ball valve 152 oil-out and enter cooler 23 before return line between be also associated with the 4th
Stop valve 314.4th stop valve 314 generally ends, synchronous when the first stop valve 311, the second stop valve 312 are opened
Open so that jacking cylinder 20 connects with fuel tank 1, avoids the occurrence of above-mentioned emptying phenomenon.
By foregoing detailed description as can be seen that the present invention can be realized super large jumbo from ground smoothly lifting
Onto flat surface, and there is the advantages of jacking cylinder avoids the occurrence of emptying phenomenon when following motion.
Claims (5)
1. a kind of have the anti-oil cylinder hydraulic drive system for being emptied function, it is characterised in that：Including fuel tank, four jacking cylinders,
Four support cylinders, four groups of jackings and support hydraulic pressure subsystem；
Include in every group of jacking and support hydraulic pressure subsystem by buncher driving duplex pump, two-bit triplet magnetic valve,
Proportional pressure control valve, the first solenoid directional control valve, the second solenoid directional control valve, the first stop valve, the second stop valve, the 3rd stop valve,
One balanced valve, the second balanced valve, the 3rd balanced valve, the 4th balanced valve, accumulator；
The oil inlet of the duplex pump is connected to the fuel tank, and the oil-out of the main oil pump of the duplex pump is connected to described two
First hydraulic fluid port of three-way magnetic valve, the second hydraulic fluid port of the two-bit triplet magnetic valve connect the oil inlet of the first check valve；
The oil-out of the auxiliary oil pump of the duplex pump is directly connected to the oil inlet of first check valve, first check valve
Oil-out be connected respectively to the oil inlet of the proportional pressure control valve, the first hydraulic fluid port of first solenoid directional control valve, described
First hydraulic fluid port of two solenoid directional control valves；
Second hydraulic fluid port of first solenoid directional control valve is connected to the reverse hydraulic fluid port of jacking cylinder through first balanced valve, described
3rd hydraulic fluid port of the first solenoid directional control valve is connected to the positive hydraulic fluid port of the jacking cylinder through second balanced valve；Described first
Balanced valve is also connected to the oil inlet of first stop valve；Second balanced valve is also connected to entering for second stop valve
Hydraulic fluid port；
Second hydraulic fluid port of second solenoid directional control valve is connected to the reverse hydraulic fluid port of support cylinder through the 3rd balanced valve, described
3rd hydraulic fluid port of the second solenoid directional control valve is connected to the positive hydraulic fluid port of support cylinder through the 4th balanced valve；4th balance
Valve is also connected to accumulator by the 3rd stop valve；
The 3rd hydraulic fluid port, the proportional overflow of jacking and the two-bit triplet magnetic valve in support hydraulic pressure subsystem described in four groups
The oil-out of valve, the 4th hydraulic fluid port of first solenoid directional control valve, the 4th hydraulic fluid port of second solenoid directional control valve, described first
The oil-out of stop valve, the oil-out of second stop valve connect back to the fuel tank by return line；
The oil-out of first check valve is connected with the first charge oil pressure sensor；
The jacking cylinder has jacking cylinder displacement transducer；The oil-out of first balanced valve and going out for the second balanced valve
Hydraulic fluid port is connected to jacking first pressure sensor and jacking second pressure sensor.
2. according to claim 1 have the anti-oil cylinder hydraulic drive system for being emptied function, it is characterised in that：The support
There is support cylinder displacement transducer and support cylinder gravity sensor on oil cylinder；The oil-out of 3rd balanced valve and described
The oil-out of 4th balanced valve is connected to support first pressure sensor and support second pressure sensor.
3. according to claim 1 have the anti-oil cylinder hydraulic drive system for being emptied function, it is characterised in that：The oil return
On pipeline cooler and filter are serially connected with the position close to fuel tank.
4. according to claim 1 have the anti-oil cylinder hydraulic drive system for being emptied function, it is characterised in that：The fuel tank
With liquid level gauge, liquid level relay, air filter and temperature sensor.
5. according to claim 3 have the anti-oil cylinder hydraulic drive system for being emptied function, it is characterised in that：The fuel tank
The 4th stop valve is also associated between the return line before entering the cooler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510830703.1A CN105271050B (en) | 2015-11-25 | 2015-11-25 | It is a kind of that there is the anti-oil cylinder hydraulic drive system for being emptied function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510830703.1A CN105271050B (en) | 2015-11-25 | 2015-11-25 | It is a kind of that there is the anti-oil cylinder hydraulic drive system for being emptied function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105271050A CN105271050A (en) | 2016-01-27 |
| CN105271050B true CN105271050B (en) | 2018-01-02 |
Family
ID=55141000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510830703.1A Active CN105271050B (en) | 2015-11-25 | 2015-11-25 | It is a kind of that there is the anti-oil cylinder hydraulic drive system for being emptied function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105271050B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007020346A1 (en) * | 2007-04-30 | 2008-11-06 | Zf Friedrichshafen Ag | Gear device's i.e. eight-gear-automatic gear device, switching unit transmission capability adjusting device for vehicle, has valve device whose connection is provided in hydraulic line during positive pressure drop between line parts |
| CN202228337U (en) * | 2011-09-19 | 2012-05-23 | 中航力源液压股份有限公司 | Empty absorbing preventing device for plunger pump |
| CN103629419A (en) * | 2013-12-17 | 2014-03-12 | 哈尔滨理工大学 | Anti-vacuumizing stop valve of hydraulic pump |
| CN203651051U (en) * | 2013-11-19 | 2014-06-18 | 浙江大学 | Hydraulic control system of passive four-corner levelling hydraulic machine |
| CN204151845U (en) * | 2014-10-14 | 2015-02-11 | 青岛雷沃挖掘机有限公司 | The excavator energy-saving hydraulic system that a kind of oil return variable back pressure valve controls |
| CN104421249A (en) * | 2013-09-03 | 2015-03-18 | 陕西胜慧源信息科技有限公司 | Emptying-preventing test system with variable displacement power-assisted motor |
| CN205187744U (en) * | 2015-11-25 | 2016-04-27 | 上海电气液压气动有限公司 | Hydro -cylinder hydraulic drive system with prevent inhaling sky function |
-
2015
- 2015-11-25 CN CN201510830703.1A patent/CN105271050B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007020346A1 (en) * | 2007-04-30 | 2008-11-06 | Zf Friedrichshafen Ag | Gear device's i.e. eight-gear-automatic gear device, switching unit transmission capability adjusting device for vehicle, has valve device whose connection is provided in hydraulic line during positive pressure drop between line parts |
| CN202228337U (en) * | 2011-09-19 | 2012-05-23 | 中航力源液压股份有限公司 | Empty absorbing preventing device for plunger pump |
| CN104421249A (en) * | 2013-09-03 | 2015-03-18 | 陕西胜慧源信息科技有限公司 | Emptying-preventing test system with variable displacement power-assisted motor |
| CN203651051U (en) * | 2013-11-19 | 2014-06-18 | 浙江大学 | Hydraulic control system of passive four-corner levelling hydraulic machine |
| CN103629419A (en) * | 2013-12-17 | 2014-03-12 | 哈尔滨理工大学 | Anti-vacuumizing stop valve of hydraulic pump |
| CN204151845U (en) * | 2014-10-14 | 2015-02-11 | 青岛雷沃挖掘机有限公司 | The excavator energy-saving hydraulic system that a kind of oil return variable back pressure valve controls |
| CN205187744U (en) * | 2015-11-25 | 2016-04-27 | 上海电气液压气动有限公司 | Hydro -cylinder hydraulic drive system with prevent inhaling sky function |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105271050A (en) | 2016-01-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201495049U (en) | Jacking actuating unit for stacker crane | |
| CN105257614B (en) | A kind of hydraulic jack high-precise synchronization control complexes of super large jumbo | |
| CN102616705B (en) | Energy-saving forklift hydraulic system with energy recovery function | |
| CN208087096U (en) | One kind being used for the raised high-precision hydraulic synchronous jacking system of large-scale tower crane supernumerary segment | |
| CN205383139U (en) | Electricity liquid pump control cylinder with differential effect device | |
| CN106762883A (en) | Hydraulic system and tower crane | |
| CN107061377B (en) | A kind of heavy duty lifting electrohydraulic control system | |
| CN205654627U (en) | Hydro -cylinder hydraulic drive system of super large jumbo | |
| CN105271050B (en) | It is a kind of that there is the anti-oil cylinder hydraulic drive system for being emptied function | |
| CN205190392U (en) | Support cylinder hydraulic system of super large jumbo | |
| CN102616700B (en) | Oil and air hybrid driven lifting control device | |
| CN105605004B (en) | The hydraulic system that a kind of driving equipment rises | |
| CN107975501A (en) | Multi-storied garage energy regenerating Application way and device | |
| CN205187744U (en) | Hydro -cylinder hydraulic drive system with prevent inhaling sky function | |
| CN205190387U (en) | Hydraulic system that drive device rises | |
| CN105605005A (en) | Oil cylinder hydraulic driving system of oversized heavy equipment | |
| CN205190375U (en) | Pressure adjustable hydraulic drive system | |
| CN105275895A (en) | Hydraulic driving system achieving pressure adjustment | |
| CN105545845B (en) | A kind of fluid pressure drive device of super large jumbo | |
| CN105298944A (en) | Supporting oil cylinder system with pressure maintaining function | |
| CN105889373B (en) | The normally closed disc brake apparatus of aqueous medium with pressurized cylinder | |
| CN107830000A (en) | Stacker-reclaimer pitching hydraulic system | |
| CN205349892U (en) | Electrical system of drive super large jumbo | |
| CN205401266U (en) | Balanced hydraulic system of heavy vertical lathe crossbeam | |
| CN205190389U (en) | Bolt hydro -cylinder system with self -locking function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |