CN202789784U - Hydraulic system with fine adjustment function - Google Patents
Hydraulic system with fine adjustment function Download PDFInfo
- Publication number
- CN202789784U CN202789784U CN 201220391423 CN201220391423U CN202789784U CN 202789784 U CN202789784 U CN 202789784U CN 201220391423 CN201220391423 CN 201220391423 CN 201220391423 U CN201220391423 U CN 201220391423U CN 202789784 U CN202789784 U CN 202789784U
- Authority
- CN
- China
- Prior art keywords
- valve
- pipeline
- solenoid directional
- directional control
- hydraulic system
- 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.)
- Expired - Lifetime
Links
Images
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
A hydraulic system with a fine adjustment function is characterized by comprising a main system, a control system and an auxiliary cooling system, wherein the main system is a closed type hydraulic system, and two outlets of a closed type variable plunger pump are respectively connected with a closed type variable motor through a pipeline, so that a closed type return circuit is formed; the middle of the pipeline of the closed type return circuit is respectively connected with a slippage pump, a flush valve, a damping throttle valve, a balance valve, a brake and a speed reducer, and the speed reducer is mounted on a hoisting winch; the control system comprises a gear pump A, an overflow valve, a magnetic exchange valve A and a magnetic exchange valve B, and the overflow valve, the magnetic exchange valve A and the magnetic exchange valve B are connected through the pipeline; and the auxiliary cooling system comprises a gear pump B, a wind cooler, a magnetic exchange valve C, a counterbalance valve and a closed type variable motor oil drainage shell body, and the wind cooler, the magnetic exchange valve C, the counterbalance valve and the closed type variable motor oil drainage shell body are connected through the pipeline.
Description
Technical field
The utility model design relates to a kind of hydraulic system, is a kind of hydraulic system with fine adjustment function specifically.Lifting main lifting closed type hydraulic system furtherly.
Background technique
The good and bad performance that directly affects engineering mechanical device of hydraulic control system, take the wind-powered electricity generation hanging device as example, along with domestic wind-power electricity generation is fast-developing, wind turbine is installed special device and is more and more caused people's concern; Wind turbine is installed erection unit is required height, it is large that it has a hoisting weight, lifting altitude is high, some in addition surpass hundred meters height, the wind turbine parts of lifting are expensive, very strict to the lifting operation safety requirement, especially in installation process, need main colluding to have fine adjustment function, be convenient to the location of parts, fixing, accurately installation.At present domestic have large-scale crawler crane and the special-purpose rubber tired crane that wind turbine is installed for wind turbine equipment is installed, its main hydraulic system that hoists adopts efficient height, response quick closing type hydraulic system usually, in closed type hydraulic system, usually do not install equilibrium valve additional, the stationarity of weight of hoisting guarantees by closed system pump, motor characteristics, but in a single day breaking at the main line that pump, motor connect to make the weight stall that hoists fall, and the hydraulic closed system is used for lifting wind turbine and has potential safety hazard like this.An equilibrium valve is installed additional for security consideration in some producer in closed system; although the existence of equilibrium valve has increased the security of system protection; but equilibrium valve in system, become heater element and when fine setting equilibrium valve open the problems such as unstable; system's heating means that engine power consumption strengthens; equilibrium valve is opened unstable interrupted, vibrations when meaning crane hanging component, impact fine setting performance.
Summary of the invention
The purpose of this utility model provides for existing deficiency in the above-mentioned prior art just that a kind of structure is more reasonable, system more optimizes, use the more safe and reliable closed type hydraulic system with fine adjustment function.
The purpose of this utility model can realize by following technique measures:
Hydraulic system with fine adjustment function described in the utility model is comprised of main system, control system and auxiliary temperature-reducing system; Wherein said main system is closed type hydraulic system, this closed type hydraulic system is to consist of closed circuit by close circuit variable pump with by pipeline and enclosed variable displacement motor, be connected with respectively slippage pump, flushing valve, damping throttle valve, equilibrium valve, break, speed reducer in the middle of the pipeline of this closed circuit, described speed reducer is installed on the elevator winch; Control system consists of by gear pump A and by relief valve, solenoid directional control valve A, solenoid directional control valve B that pipeline connects; The auxiliary temperature-reducing system consists of by gear pump B and by forced air cooler, solenoid directional control valve C, back pressure valve and enclosed variable displacement motor draining housing that pipeline connects.
One side working connection of the closed circuit in the main system described in the utility model is provided with an equilibrium valve, the control mouth of equilibrium valve is connected with the oil circuit control of opposite side working connection and control system respectively, and the control mouth of equilibrium valve is connected with working connection through the damping throttle valve.
Relief valve described in the utility model in the control system, solenoid directional control valve A and solenoid directional control valve B are connected pipeline and are connected with the pressure oil-source of gear pump A respectively, solenoid directional control valve A connects respectively one-way valve and break by pipeline, one-way valve outlet connecting balanced valve control mouth, solenoid directional control valve B is connected with brake cylinder control mouth by pipeline, and the flow-off of relief valve takes back fuel tank.
Forced air cooler outlet in the system of auxiliary temperature-reducing described in the utility model connects respectively back pressure valve and solenoid directional control valve C by pipeline, the back pressure valve outlet connects fuel tank, solenoid directional control valve C exports the housing drain tap that is connected to the enclosed variable displacement motor by pipeline, and another drain tap of enclosed variable displacement motor housing takes back fuel tank; Described auxiliary temperature-reducing system plays the effect of the housing oil liquid temperature of cooling enclosed variable displacement motor by flushing, and its flushing maximum pressure is less than the setting pressure of back pressure valve.
Back pressure valve in the described auxiliary temperature-reducing system, its cracking pressure be greater than 0.2MPa, and bear the one-way valve of pressure less than motor draining housing maximum.
The beneficial effects of the utility model are as follows:
Because main hydraulic system is closed type hydraulic system, adopt Variable plunger pump and variable displacement motor in the system, realize function of stepless speed regulation, auxiliary lower at automatical control system, discharge capacity by variable displacement pump, variable displacement motor realizes fast, at a slow speed with the fine motion function, when fine motion, avoided opening discontinuous discontinuous, the wild effect of output torque that causes the uneven hydraulic system that causes of motor rotary speed because of equilibrium valve.
Because a side of closed system arranges equilibrium valve, and adopt inside and outside joint control opening ways, eliminated equilibrium valve produces heat when main system work problem, saving engine power loss; Increase simultaneously safety protection, principle is: during closed system work, when the oil circuit control external control part of be used for opening equilibrium valve during if there is fault, the internal control oil circuit can make equilibrium valve open, because the external control oil circuit is provided with one-way valve, the internal control pressure oil liquid can not flow back to affects the main system performance in the external control system, because internal control one side is provided with the damping throttle valve; When the main system oil pressure is crossed low or during pressure surge, under the external control oil pressure is got involved, make that to jointly control the oil pressure of opening equilibrium valve stable and can not fluctuate thereupon, the external control hydraulic system also can not be affected, and main system still can keep normal operation; If break when the weight main system pipeline in decline that hoists meets accident, the operator in time moves Joystick meta to or presses danger button, cutting-off controlling solenoid directional control valve power supply and stop motor, equilibrium valve cuts out thereupon, the weight that stall is fallen stops to descend, solved insurmountable safety problem in the closed system that equilibrium valve is not set, if do not get involved when the weight that hoists has the external control oil pressure in decline, the certain oil pressure of working connection needs that principal series is unified side could be opened the equilibrium valve of opposite side, in fact main decline of colluding is by the weight deadweight rather than by the main system oil pressure, the main system that is used for like this unlatching equilibrium valve needs the larger power of loss, and the final conversion thermal energy of these loss powers raises the main system oil temperature.
The auxiliary temperature-reducing system makes the fluid of fuel tank cool off by forced air cooler, makes the fluid that is lower than the back pressure valve setting pressure wash cooling to motor casing, thereby realizes the variable displacement motor in the main system is lowered the temperature.
In view of above some, the hydraulic system with fine adjustment function disclosed in the utility model has energy-saving and emission-reduction, safe and reliable beneficial effect.
Description of drawings
Fig. 1 is the utility model embodiment's hydraulic schematic diagram.
Sequence number among the figure: 1 close circuit variable pump; 2 slippage pumps; 3 flushing valves; 4 damping throttle valve; Flat 5 weighing apparatus valves; 6 enclosed variable displacement motors; 7 breaks; 8 elevator winches; 9 retarders; 10 brake cylinders; 11 one-way valves; 13 solenoid directional control valve A, 14 solenoid directional control valve B; 12 solenoid directional control valve C, 15 forced air coolers; 16 gear pump B; 17 back pressure valves; 18 relief valves; 19 gear pump A.
Embodiment
The utility model is further described below with reference to embodiment's (accompanying drawing):
As shown in the figure, the hydraulic system with fine adjustment function described in the utility model is comprised of main system, control system and auxiliary temperature-reducing system; Main system is closed type hydraulic system, and it is combined by close circuit variable pump 1, slippage pump 2, flushing valve 3, damping throttle valve 4, equilibrium valve 5, enclosed variable displacement motor 6, break 7, retarder 9 and elevator winch 8 pipelines; Control system is by gear pump A 19, and relief valve 18, solenoid directional control valve A 13, solenoid directional control valve B 14, brake cylinder 10, one-way valve 11 and pipeline combine; The auxiliary temperature-reducing system is by gear pump B 16, and forced air cooler 15, back pressure valve 17, solenoid directional control valve C 12 and pipeline form.
1 two delivery outlets of wherein said closed system close circuit variable pump are connected respectively on the enclosed variable displacement motor 6 by pipeline and consist of closed circuit, connect respectively slippage pump 2, flushing valve 3 and equilibrium valve 5 in the middle of its pipeline, described equilibrium valve 5 arranges on the side working connection of closed circuit, the control mouth of equilibrium valve 5 is connected with the oil circuit control of opposite side working connection and control system respectively, and the control mouth of equilibrium valve 5 is connected with working connection through damping throttle valve 4; Control gear pump A 19 outlets connect respectively relief valve 18 and solenoid directional control valve A 13, solenoid directional control valve B 14 by pipeline, solenoid directional control valve A13 connects respectively one-way valve 11 and break 7 by pipeline, one-way valve 11 outlet connecting balanced valves 5 control mouths, access point is between equilibrium valve 5 control mouths and damping throttle valve 4, solenoid directional control valve B14 is connected with brake cylinder 10 control mouths by pipeline, and the flow-off of relief valve 18 takes back fuel tank; The auxiliary temperature-reducing system connects forced air cooler 15 by gear pump B 16 outlets by pipeline, forced air cooler 15 outlets connect respectively back pressure valve 17 and solenoid directional control valve C 12 by pipeline, back pressure valve 17 outlets connect fuel tank, solenoid directional control valve C 12 outlets are connected to enclosed variable displacement motor 6 housing drain taps by pipeline, and another drain tap of motor casing takes back fuel tank.The oil pressure of auxiliary temperature-reducing system flushing cooling motor housing is lower than the pressure that back pressure valve 17 is set all the time, makes flushing cooling oil pressure can bear pressure less than motor casing all the time, has guaranteed the use safety of enclosed variable displacement motor 6.
When it is applied on the wind power hoist, when crane hoisting, close circuit variable pump 1, slippage pump 2 in the engine-driving main system, close circuit variable pump 1 drives enclosed variable displacement motor 6, enclosed variable displacement motor 6 drives retarder 9, elevator winch 8, the final lifting that realizes that the master colludes, main system realizes stepless speed regulation by automatically controlled and hydraulic control; Slippage pump 2 is the one side repairing of main system low pressure, and flushing valve 3 reduces the main system oil temperature for the high-temperature oil liquid of main system low pressure one side overflows to fuel tank in proportion, and the three-stage brake of break 7, brake cylinder 10 and equilibrium valve 5 realization systems is guaranteed security of system; Collude when needing fine setting when main, close circuit variable pump 1 permits discharge capacity to enclosed variable displacement motor 6 by automatically controlled output minimum, and enclosed variable displacement motor 6 is by automatically controlled or hydraulic control, discharge capacity is to maximum, make like this enclosed variable displacement motor 6 rotating speeds to the slowest, reach fine motion, realize the main fine adjustment function that colludes; When colluding, be provided with an equilibrium valve 5 when main in a lateral line, protective system avoids the pipeline hoisting heavy stall falling accident that in a single day breaks to occur.Be connected to simultaneously on the equilibrium valve 5 oil circuit control interfaces by fluid and the fluid of external control oil circuit control by solenoid directional control valve A 13, one-way valve 11 of main system opposite side oil circuit by damping throttle valve 4, the maximum oil pressure of getting in two oil circuits is opened equilibrium valve 5, guarantee the equilibrium valve unlatching, main colluding finely tuned steadily.Control system connects respectively relief valve 18 and solenoid directional control valve A 13, solenoid directional control valve B 14 by gear pump A 19 by pipeline, relief valve 18 flow-offs take back fuel tank, the control system oil liquid pressure is stabilized in the scope of relief valve 18 settings, and the control oil sources divides two-way; One the tunnel is to assist unlatching by electric control electromagnetic selector valve A 13 through one-way valve 11 control equilibrium valves 5, there is one-way valve 11 to arrange and guarantees that the main system high pressure fuel source can not flow back in the control system, connect the access point of equilibrium valve 5 between equilibrium valve 5 control mouths and damping throttle valve 4, when main system low pressure, have damping throttle valve 4 to arrange control system pressure is decreased; Another road is to realize elevator braking and unlatching by 14 pairs of brake cylinders of automatically controlled control solenoid directional control valve B 10; control system is used for three-stage brake control and equilibrium valve 5 auxiliary unlatchings of main system, and multistage brake and equilibrium valve 5 arrange has realized the protection of main system maltilevel security.The auxiliary temperature-reducing system is cooled by forced air cooler 15 discharging oil sources by pipeline by gear pump B 16, and connect respectively back pressure valve 17 and solenoid directional control valve C 12, the fluid that is higher than back pressure valve 17 and sets pressure is overflowed to fuel tank, the fluid that is lower than back pressure valve 17 setting pressures is washed cooling enclosed variable displacement motor 6 housings by solenoid directional control valve C 12 delivery outlets by pipeline, the fluid of flushing enclosed variable displacement motor 6 housings is taken back fuel tank by another drain tap, the fluid of process forced air cooler 15 coolings makes part fluid be used for flushing cooling enclosed variable displacement motor 6 draining housings by the back pressure set of back pressure valve 17, and enclosed variable displacement motor 6 is lowered the temperature.
The above is for being not limited to embodiment of the present utility model; all increases on this embodiment's basis, minimizing, conversion implementation step sequential scheduling; or use committed step described in the utility model or system and wherein hanging the equipment of carrying and all will being considered as distorting or plagiarizing of the present utility model of consisting of, protected by the utility model.
Claims (5)
1. hydraulic system with fine adjustment function, it is characterized in that: described hydraulic system is comprised of main system, control system and auxiliary temperature-reducing system; Wherein said main system is closed type hydraulic system, this closed type hydraulic system is to consist of closed circuit by close circuit variable pump (1) with by pipeline and enclosed variable displacement motor (6), be connected with respectively slippage pump (2), flushing valve (3), damping throttle valve (4), equilibrium valve (5), break (7), speed reducer (9) in the middle of the pipeline of this closed circuit, described speed reducer (9) is installed on the elevator winch (8); Control system is by gear pump A(19) and the relief valve (18), the solenoid directional control valve A(13 that connect by pipeline), solenoid directional control valve B(14) consist of; The auxiliary temperature-reducing system is by gear pump B(16) and the forced air cooler (15), the solenoid directional control valve C(12 that connect by pipeline), back pressure valve (17) and enclosed variable displacement motor (6) draining housing formation.
2. the hydraulic system with fine adjustment function according to claim 1, it is characterized in that: a side working connection of the closed circuit in the described main system is provided with an equilibrium valve (5), the control mouth of equilibrium valve (5) is connected with the oil circuit control of opposite side working connection and control system respectively, and the control mouth of equilibrium valve (5) is connected with working connection through damping throttle valve (4).
3. the hydraulic system with fine adjustment function according to claim 1, it is characterized in that: the relief valve in the described control system (18), solenoid directional control valve A(13) be connected with solenoid directional control valve B(14 by pipeline respectively with gear pump A(19) pressure oil-source be connected, solenoid directional control valve A(13) connects respectively one-way valve (11) and break (7) by pipeline, one-way valve (11) outlet connecting balanced valve (5) control mouth, solenoid directional control valve B(14) be connected with brake cylinder (10) control mouth by pipeline, the flow-off of relief valve (18) takes back fuel tank.
4. the hydraulic system with fine adjustment function according to claim 1, it is characterized in that: forced air cooler (15) outlet in the described auxiliary temperature-reducing system connects respectively back pressure valve (17) and solenoid directional control valve C(12 by pipeline), back pressure valve (17) outlet connects fuel tank, solenoid directional control valve C(12) export the housing drain tap that is connected to enclosed variable displacement motor (6) by pipeline, another drain tap of enclosed variable displacement motor (6) housing takes back fuel tank.
5. the hydraulic system with fine adjustment function according to claim 1 is characterized in that: the maximum pressure of flushing cooling enclosed variable displacement motor (6) the housing fluid in the described auxiliary temperature-reducing system is less than the setting pressure of back pressure valve (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220391423 CN202789784U (en) | 2012-08-09 | 2012-08-09 | Hydraulic system with fine adjustment function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220391423 CN202789784U (en) | 2012-08-09 | 2012-08-09 | Hydraulic system with fine adjustment function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202789784U true CN202789784U (en) | 2013-03-13 |
Family
ID=47817050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220391423 Expired - Lifetime CN202789784U (en) | 2012-08-09 | 2012-08-09 | Hydraulic system with fine adjustment function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202789784U (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103206431A (en) * | 2013-04-18 | 2013-07-17 | 中联重科股份有限公司渭南分公司 | Closed rotary system and engineering machinery comprising same |
| CN103362897A (en) * | 2013-06-25 | 2013-10-23 | 三一重机有限公司 | Early warning protection device of travel motor as well as travel motor and travel machinery |
| CN103527562A (en) * | 2013-11-04 | 2014-01-22 | 恒天九五重工有限公司 | Oil-replenishing-pressure-adjustable hydraulic oil replenishing device of rotary motor of rotary drilling rig |
| CN104229661A (en) * | 2013-06-19 | 2014-12-24 | 常州大学 | Hydraulic control system for winch |
| CN104948518A (en) * | 2015-05-06 | 2015-09-30 | 湖州双力自动化科技装备有限公司 | Thermocompressor system |
| CN106948409A (en) * | 2017-05-23 | 2017-07-14 | 徐州徐工挖掘机械有限公司 | Super-tonnage excavator closed rotary rinses oil piping system |
| CN108506256A (en) * | 2018-03-27 | 2018-09-07 | 江苏恒立液压科技有限公司 | Drive hydraulic control system |
| CN109058188A (en) * | 2018-09-06 | 2018-12-21 | 湖南农业大学 | A kind of hydrostatic transmission of electromagnetic switch |
| CN109371920A (en) * | 2018-11-30 | 2019-02-22 | 中国电建集团成都勘测设计研究院有限公司 | Gate Rapid door closer hydraulic damping speed-regulating system |
| CN109773103A (en) * | 2019-03-18 | 2019-05-21 | 杭州诺祥科技有限公司 | Flow matching type hydraulic machine servo control system |
| CN110656558A (en) * | 2019-09-10 | 2020-01-07 | 江苏四明工程机械有限公司 | Four-crawler intelligent slip form paver and upright post floating electro-hydraulic control system thereof |
-
2012
- 2012-08-09 CN CN 201220391423 patent/CN202789784U/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103206431A (en) * | 2013-04-18 | 2013-07-17 | 中联重科股份有限公司渭南分公司 | Closed rotary system and engineering machinery comprising same |
| CN103206431B (en) * | 2013-04-18 | 2016-03-02 | 中联重科股份有限公司渭南分公司 | Closed rotary system and engineering machinery comprising same |
| CN104229661A (en) * | 2013-06-19 | 2014-12-24 | 常州大学 | Hydraulic control system for winch |
| CN103362897A (en) * | 2013-06-25 | 2013-10-23 | 三一重机有限公司 | Early warning protection device of travel motor as well as travel motor and travel machinery |
| CN103527562A (en) * | 2013-11-04 | 2014-01-22 | 恒天九五重工有限公司 | Oil-replenishing-pressure-adjustable hydraulic oil replenishing device of rotary motor of rotary drilling rig |
| CN103527562B (en) * | 2013-11-04 | 2016-04-27 | 恒天九五重工有限公司 | A kind of adjustable hydraulic pressure recharging oil device of oil compensation pressure of Operation of Rotary Pile Drill motor |
| CN104948518A (en) * | 2015-05-06 | 2015-09-30 | 湖州双力自动化科技装备有限公司 | Thermocompressor system |
| CN104948518B (en) * | 2015-05-06 | 2017-03-15 | 湖州双力自动化科技装备有限公司 | A kind of heating press system |
| CN106948409A (en) * | 2017-05-23 | 2017-07-14 | 徐州徐工挖掘机械有限公司 | Super-tonnage excavator closed rotary rinses oil piping system |
| CN108506256A (en) * | 2018-03-27 | 2018-09-07 | 江苏恒立液压科技有限公司 | Drive hydraulic control system |
| CN109058188A (en) * | 2018-09-06 | 2018-12-21 | 湖南农业大学 | A kind of hydrostatic transmission of electromagnetic switch |
| CN109371920A (en) * | 2018-11-30 | 2019-02-22 | 中国电建集团成都勘测设计研究院有限公司 | Gate Rapid door closer hydraulic damping speed-regulating system |
| CN109371920B (en) * | 2018-11-30 | 2023-11-21 | 中国电建集团成都勘测设计研究院有限公司 | Hydraulic damping speed regulating system for quick closing gate |
| CN109773103A (en) * | 2019-03-18 | 2019-05-21 | 杭州诺祥科技有限公司 | Flow matching type hydraulic machine servo control system |
| CN110656558A (en) * | 2019-09-10 | 2020-01-07 | 江苏四明工程机械有限公司 | Four-crawler intelligent slip form paver and upright post floating electro-hydraulic control system thereof |
| CN110656558B (en) * | 2019-09-10 | 2024-04-26 | 江苏四明工程机械有限公司 | Four-crawler intelligent slipform paver and upright post floating electrohydraulic control system thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202789784U (en) | Hydraulic system with fine adjustment function | |
| CN101476543B (en) | Off-course driving device of non-off course gear used for aerogenerator | |
| CN205838429U (en) | Hydraulic disc type braking deivce for winch | |
| WO2013086882A1 (en) | Crane, and closed-type hoist negative power control system for use with crane | |
| CN207632362U (en) | Emergent overload protective device | |
| CN201620891U (en) | Variable frequency closed type hydraulic traction system of shearer | |
| CN103573729A (en) | Mine hoist hydraulic station | |
| CN207759955U (en) | A kind of boring winch disc brake novel hydraulic system | |
| CN218116361U (en) | Flow and pressure regulating device for hydropower station | |
| CN202641393U (en) | Device for preventing over-speed of engine caused by reverse dragging of hydraulically-driven engineering vehicle | |
| CN104595287B (en) | Energy-reclaiming constant deceleration hydraulic station | |
| CN206159139U (en) | Gas recovery bell -shaped valve hydraulic control device | |
| CN204592200U (en) | A kind of long-range water supply hydraulic system | |
| CN102733360B (en) | Emergency operation device and gate system of winch hoist | |
| CN201535385U (en) | Hammer/energy accumulator composite hydraulic control slowly closing valve actuator | |
| CN110473695A (en) | A kind of municipal works intelligent cooling explosion-proof transformer | |
| CN204003686U (en) | Mine hoist hydraulic station | |
| CN201786819U (en) | Hydraulic hybrid power oil temperature control device | |
| CN210064997U (en) | Self-supporting frequency conversion traction winch | |
| CN209482265U (en) | Gate Rapid door closer hydraulic damping speed-regulating system | |
| CN206634964U (en) | Ocean winch electro-hydraulic brake system based on Closed Hydraulic brake | |
| CN104929994A (en) | Gas-liquid conversion energy-saving work station | |
| CN203113290U (en) | Novel flap valve control system | |
| CN110127546A (en) | A kind of self-supporting inverter-fed traction winch | |
| CN101864915B (en) | Continuous tube injection head control device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130313 |