CN102418725B - Pumping equipment and distribution hydraulic system - Google Patents
Pumping equipment and distribution hydraulic system Download PDFInfo
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- CN102418725B CN102418725B CN2011103254190A CN201110325419A CN102418725B CN 102418725 B CN102418725 B CN 102418725B CN 2011103254190 A CN2011103254190 A CN 2011103254190A CN 201110325419 A CN201110325419 A CN 201110325419A CN 102418725 B CN102418725 B CN 102418725B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
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- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/042—Controlling the temperature of the fluid
- F15B21/0427—Heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
- F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5157—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a return line
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/6343—Electronic controllers using input signals representing a temperature
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention provides a distribution hydraulic system of pumping equipment, which comprises a hydraulic pump, a change valve, a check valve, an accumulator and a pressure control assembly. The distribution hydraulic system comprises a working mode and a heating mode, wherein under the heating mode, the hydraulic pump can drive hydraulic oil to overflow through the pressure control assembly, so that hydraulic energy is converted into heat energy, and then the temperature of the hydraulic oil can be rised by the heat energy. The invention also provides the pumping equipment and a heating method thereof.
Description
Technical field
The present invention relates to a kind of engineering machinery field, particularly a kind of thick substances pumping equipment.
Background technique
In the Current Engineering Construction, generally adopt thick substances pumping equipment, for example, building field often adopts the pumping equipment cast concrete, and same pumping equipment often will be in different regions, the Various Seasonal construction, and the ambient temperature difference is very large.Pumping equipment generally adopts hydraulic system to drive, and hydraulic medium is crossed when low in temperature, and viscosity increases, and causes pump start to suck difficulty, and when excess Temperature, fluid is perishable, simultaneously the hydraulic element decrease in efficiency.
At present, have following several method to make hydraulic system adapt to different ambient temperatures: (1) adopts the method for changing variety classes hydraulic oil to adapt to different ambient temperatures.When ambient temperature is low, adopt low viscosity, low pour point hydraulic oil or low temperature hydraulic oil.When ambient temperature is higher, adopt viscosity higher hydraulic oil.(2) adopt heater, cooler control oil liquid temperature.When temperature is low, with the heater heating, when temperature is higher, cool off with cooler.
At present, comparatively ripe for preventing the too high technology of oil temperature, but for the measure of low temperature environment, also have some defectives.(1) it is cumbersome to change different types of hydraulic oil operation, needs to consider the compatibility of variety classes hydraulic oil, and the cost of changing simultaneously hydraulic oil is also higher, and trouble is preserved, processes all to the hydraulic oil that changes, and the low temperature hydraulic oil price general charged is higher.(2) heater needs the power supply of relatively high power, and this is sometimes relatively more difficult for Diesel Driven, in addition, adopts the heater heating to cause hydraulic oil rotten because of local superheating sometimes.
Summary of the invention
Technical problem to be solved by this invention is, the pumping equipment that a kind of distribution hydraulic system that can heat hydraulic oil is provided and adopts this distribution hydraulic system with and heating means.
For solving the problems of the technologies described above, the present invention has adopted following technological scheme:
Provide a kind of pumping equipment to distribute hydraulic system, this distribution hydraulic system comprises oil hydraulic pump, selector valve, one-way valve, accumulator and pressure control assembly; Described distribution hydraulic system comprises mode of operation and heating mode, and wherein, under heating mode, described hydraulic pump drive hydraulic oil makes the hydraulic energy conversion thermal energy through described pressure control assembly overflow, and oil temperature is raise.
Preferably, described oil hydraulic pump comprises constant pressure pump, and under mode of operation, the pressure cut off value of described constant pressure pump is less than the oil pressure relief value of described pressure control assembly; Under heating mode, the pressure cut off value of described constant pressure pump is greater than the oil pressure relief value of described pressure control assembly.
Preferably, under heating mode, the oil pressure relief value of described pressure control assembly is constant, and the pressure cut off value of described constant pressure pump is increased the oil pressure relief value greater than described pressure control assembly.
Preferably, described constant pressure pump comprises the electric control constant press pump, and the cut-out pressure value of this electric control constant press pump can be by electric adjusting.
Preferably, under heating mode, the pressure cut off value of described constant pressure pump is constant, and the oil pressure relief value of described pressure control assembly is cut to the pressure cut off value less than described constant pressure pump.
Preferably, described pressure control assembly comprises proportional pressure valve; Under mode of operation, the pressure cut off value of described constant pressure pump is lower than the oil pressure relief value of described proportional pressure valve; Under heating mode, the oil pressure relief value of described proportional pressure valve is downgraded is lower than described pressure cut off value.
Preferably, described pressure control assembly comprises relief valve and proportion pilot pressure valve/electromagnetic proportional valve of linking to each other with the remote control mouth of this relief valve/Manual pilot pressure valve; Under mode of operation, the pressure cut off value of described constant pressure pump is lower than the oil pressure relief value of the setting of described proportion pilot pressure valve/electromagnetic proportional valve/Manual pilot pressure valve; Under heating mode, the oil pressure relief value of the setting of described proportion pilot pressure valve/electromagnetic proportional valve/Manual pilot pressure valve is downgraded is lower than described pressure cut off value.
Preferably, described pressure control assembly comprises the multistage overflow valve group, and this multistage overflow valve group comprises relief valve, pilot pressure valve and solenoid valve, and the remote control mouth of described relief valve connects described solenoid valve import, and described electromagnetic valve outlet connects described pilot pressure valve; Under heating mode, described pilot pressure valve setup pressure value is downgraded the pressure cut off value less than constant pressure pump.
Preferably, described oil hydraulic pump comprises metering pump, and described pressure control assembly comprises electromagnetic relief valve or unloading overflow valve, and at heating mode, the unloading function of electromagnetic relief valve or unloading overflow valve is stopped.
Preferably, described distribution hydraulic system comprises temperature detection element, be used for when sensing oil temperature and be lower than the first setting value, should distribute hydraulic system to switch to heating mode by mode of operation, and/or be used for when sensing oil temperature and be higher than the second setting value, should distribute hydraulic system to switch to mode of operation by heating mode, this second setting value is more than or equal to described the first setting value.
The present invention also provides a kind of pumping equipment, comprises above-mentioned distribution hydraulic system in each.
Preferably, this pumping equipment adopts motor that power is provided.
The present invention also provides a kind of above-mentioned heating means of distributing hydraulic system in each, and the method comprises the steps:
(A) when oil temperature is lower than the first setting value, impel described distribution hydraulic system to enter heating mode;
(B) primer fluid press pump, hydraulic oil is converted to heat energy through the overflow of described distribution hydraulic system with hydraulic energy, and this heat energy raises oil temperature.
Preferably, also comprise step (C): when oil temperature is elevated to when being higher than the second setting value, impel and distribute hydraulic system to stop overflow, described distribution hydraulic system enters mode of operation; This second setting value is more than or equal to the first setting value.
Preferably, step (A) is that ambient temperature is lower, causes oil temperature to be lower than described the first setting value, carries out before starting pumping; Or long because of standby time, cause oil temperature to drop to carrying out when being lower than described the first setting value.
Preferably, under heating mode, described oil hydraulic pump is with low-speed running.
Compare with correlation technique, adopt the distribution hydraulic system among the present invention that hydraulic oil is heated, have plurality of advantages, for example, hydraulic oil energy homogeneous heating, it is rotten the too high hydraulic oil that causes of local temperature can not occur; In addition, because fluid constantly flows, the fluid superheating phenomenon can not appear; Moreover, utilize the hydraulic element of system itself to heat, can not need increases the extra high-power electric appliances such as heater, and being more suitable in motor is the pumping equipment of power.
Description of drawings
Fig. 1 is the sketch that adopts the distribution hydraulic system of constant pressure pump in the correlation technique.
Fig. 2 is the sketch that adopts the distribution hydraulic system of metering pump in the correlation technique.
Fig. 3 is the sketch of the distribution hydraulic system in the first embodiment of the invention.
Fig. 4 is the sketch of the distribution hydraulic system in the second embodiment of the invention.
Fig. 5 is the sketch of the distribution hydraulic system in the third embodiment of the invention.
Embodiment
Below in conjunction with specific embodiment and Figure of description the present invention is described in further details.
In pumping equipment, what control and driving distributing valve moved is to distribute hydraulic system, and it is multiple that the kind of distributing valve has, for example, and S shape pendulum valve, C shape valve and raw oblique sluice valve etc.At present in pumping equipment and since during distributing valve work actuation time very short, but movement speed is very fast, needs pressurize after the action, the general pressure dwelling loop that adopts with accumulator of the distribution hydraulic system of pumping equipment.Distribution system has two kinds of pressure dwelling loops commonly used, namely adopts the pressure dwelling loop of constant pressure pump and the pressure dwelling loop of employing metering pump.
Fig. 1 is for adopting distribution hydraulic system 100 sketches of constant pressure pump, this distribution hydraulic system 100 comprises constant pressure pump 1, one-way valve 2, relief valve 3, pressure gauge (or pressure transducer) 4, accumulator 5, solenoid directional control valve 6, selector valve 7 and oscillating oil cylinder 8,9, wherein, relief valve 3 is the pressure control assembly of system 1.In the working procedure, after constant pressure pump 1 starts, to accumulator 5 pressurisings, because constant pressure pump 1 pressure cut off value is less than relief valve 3 oil pressure relief values, when pressurising reached constant pressure pump 1 pressure cut off setting value, constant pressure pump 1 discharge capacity was automatically turned down and only is used for replenishment system and leaks, at this moment, system's pressurize.When selector valve 7 action, accumulator 5 promotes oscillating oil cylinders 8,9 actions with constant pressure pump 1 fuel feeding through selector valve 7, and accumulator 5 oil pressure descend, and after oscillating oil cylinder 8,9 actions put in place, constant pressure pump 1 was again to accumulator 5 pressurisings, when reaching setting value, and system's pressurize.So move in circles.
Fig. 2 is for adopting distribution hydraulic system 200 sketches of metering pump.This distribution hydraulic system 200 comprises metering pump 1a, one-way valve 2a, electromagnetic relief valve 3a, pressure gauge (or pressure transducer) 4a, accumulator 5a, solenoid directional control valve 6a, selector valve 7a and oscillating oil cylinder 8a, 9a.In the working procedure, after metering pump 1a started, to accumulator 5a pressurising, when pressurising reached setting value, metering pump 1a was through electromagnetic relief valve 3a off-load, and system adopts the pressurize of accumulator 5a system.When selector valve 7a moved, accumulator 5a was released into pressure oil, promoted oscillating oil cylinder 8a, 9a action through selector valve 7a, and accumulator 5a oil pressure descends simultaneously, and metering pump 1a stops off-load, to accumulator 5a pressurising, and when reaching setting value, system's pressurize.So move in circles.Be appreciated that ground, in distributing hydraulic system 200, electromagnetic relief valve 3a also can change unloading overflow valve into, and when system reached the unloading overflow valve setting pressure, unloading overflow valve was metering pump 1a off-load.
In above-mentioned distribution hydraulic system 100 and 200, when ambient temperature was low, oil temperature was also lower during startup, crossed when low when oil temperature, for making the hydraulic system normal operation, generally need to heat hydraulic oil.For the time point that starts heating, because when system works after a period of time, system's oil temperature can raise gradually.So, when ambient temperature is low, as long as under following two states, oil temperature is heated, just can make system's normal operation: before (1) concrete equipment operation oil temperature is carried out preheating; (2) when the concrete equipment standby time longer, cause system's oil temperature lower, before again starting oil temperature is carried out preheating.
Fig. 3 shows the distribution hydraulic system 300 in the first embodiment of the invention, and this distribution hydraulic system 300 comprises mode of operation and heating mode, and it can heat to hydraulic oil under heating mode.The principle of the principle of distribution hydraulic system 300 and distribution hydraulic system 100 shown in Figure 1 is close, its distinctive points mainly is to distribute the constant pressure pump 1 of hydraulic system 100 to replace with electric control constant press pump 1b, and the pressure cut off value of electric control constant press pump 1b can be by electric automatic adjusting.When oil temperature is lower than the first setting value, and when needing heating, by the pressure cut off value of electric adjusting electric control constant press pump 1b, makes the pressure cut off value be higher than the oil pressure relief value of relief valve 3, and enter heating mode; When constant pressure pump 1b started, preferably, under heating mode, electric control constant press pump 1b was with low-speed running.Constant pressure pump 1b is to accumulator 5 pressurisings, system pressure constantly raises, therefore the oil pressure relief value of relief valve 3 is lower than the pressure cut off value time, so, relief valve 3 at first works, and constant pressure pump 1b discharge capacity is constant, and flow system flow all flows back to fuel tank from relief valve 3, hydraulic energy is converted to heat, and heat impels oil liquid temperature to raise.When oil temperature is elevated to when being higher than the second setting value, the pressure cut off value of electric control constant press pump 1b is recalled to initial value, distribute hydraulic system 300 can drive and control the operation of distributing valve, and enter mode of operation.This second setting value is more than or equal to the first setting value.
Be appreciated that ground, distribute hydraulic system 300 also can comprise temperature detection element, be used for when sensing oil temperature and be lower than the first setting value, should distribute hydraulic system 300 to switch to heating mode by mode of operation, and/or be used for when sensing oil temperature and be higher than the second setting value, should distribute hydraulic system 300 to switch to mode of operation by heating mode.
Fig. 4 shows the distribution hydraulic system 400 in the second embodiment of the invention, this distributes hydraulic system 400 and distributes hydraulic system 300 similar, its main distinction is, this distributes the constant pressure pump 1 of hydraulic system 400 to adopt common constant pressure pump, the remote control mouth of relief valve 3c links to each other with proportion pilot pressure valve 10, can realize stepless voltage regulation.Under mode of operation, the pressure cut off value of constant pressure pump 1 is lower than the oil pressure relief value that proportion pilot pressure valve 10 is set, when ambient temperature lower, in the time of need to heating hydraulic oil, the oil pressure relief value of proportion pilot pressure valve 10 transferred to be lower than constant pressure pump 1 pressure cut off value, during operation, 1 pair of accumulator 5 pressurising of constant pressure pump, when pressure is elevated to the oil pressure relief value of proportion pilot pressure valve 10 settings, relief valve 3c opens, flow system flow all flows back to fuel tank from relief valve 3c, and hydraulic energy is converted to heat, with the temperature rising of hydraulic oil.Be appreciated that, in other embodiments, relief valve 3c and proportion pilot pressure valve 10 be an available electromagnetic proportional valve or other proportional pressure valve replacements that is fit to also, also can change proportion pilot pressure valve 10 into the Manual pilot pressure valve, the manual adjustment system oil pressure relief.
Fig. 5 shows shown in the distribution hydraulic system 500 in the third embodiment of the invention, it is similar with distribution hydraulic system 400, the main distinction is, relief valve 3d remote control mouth connects solenoid valve 12 imports, solenoid valve 12 outlets connect pilot pressure valve 11, and when solenoid valve 12 dead electricity, system's relief valve pressure is set by relief valve 3d, when solenoid valve 12 when electric, system's oil pressure relief is set by pilot pressure valve 11.Like this, system just has two oil pressure relief values, make the oil pressure relief value of pilot pressure valve 11 less than constant pressure pump 1 pressure cut off value, the oil pressure relief value of relief valve 3d is higher than the pressure cut off value of constant pressure pump 1, then under mode of operation, solenoid valve 12 dead electricity, system's oil pressure relief is set by relief valve 3d, the pressure cut off of constant pressure pump 1 works prior to relief valve 3d, and system can overflow.When at heating mode, impel solenoid valve 12 electric, system's oil pressure relief is set by pilot pressure valve 11, pilot pressure valve 11 is prior to constant pressure pump 1 pressure cut off previous crops usefulness, the overflow of elder generation of system, and flow system flow all flows back to fuel tank from relief valve 3d, hydraulic energy is converted to heat, and oil liquid temperature raises.
Same Fig. 2 of schematic diagram of distribution hydraulic system in the fourth embodiment of the invention namely adopts metering pump, and this distribution hydraulic system also comprises mode of operation and heating mode, under mode of operation, and when system pressure is raised to desired value, electromagnetic relief valve 3a off-load.When the low needs heating of oil temperature, the control electromagnet is in off-position always, so that electromagnetic relief valve 3a stops unloading function, and enter heating mode, when system pressure was elevated to the oil pressure relief value of electromagnetic relief valve 3a, flow system flow all from relief valve 3a overflow, flowed back to fuel tank, hydraulic energy is converted to heat, impels the pressure oil temperature to raise.
Adopt the above-mentioned distribution hydraulic system that possesses heating mode and mode of operation, can bring many beneficial effects, for example, hydraulic oil energy homogeneous heating, it is rotten the too high hydraulic oil that causes of local temperature can not occur; In addition, because hydraulic oil constantly flows, the hydraulic oil superheating phenomenon can not appear; Moreover, owing to utilize the hydraulic element of system own to heat, and do not need to increase the high-power electric appliance such as heater, being more suitable in motor is the pumping equipment of power.
The above only is preferred implementation of the present invention, and protection scope of the present invention also not only is confined to above-described embodiment, and all technological schemes that belongs under the thinking of the present invention all belong to protection scope of the present invention.Should be pointed out that for those skilled in the art in the some improvements and modifications that do not break away under the principle of the invention prerequisite, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
1. one kind is used for control and drives the thick substances pumping devices allocation hydraulic system that distributing valve moves, and this distribution hydraulic system comprises oil hydraulic pump, selector valve, one-way valve, accumulator and pressure control assembly; It is characterized in that described distribution hydraulic system comprises mode of operation and heating mode, wherein, under described heating mode, described hydraulic pump drive hydraulic oil makes the hydraulic energy conversion thermal energy through described pressure control assembly overflow, and oil temperature is raise;
Described oil hydraulic pump comprises constant pressure pump, and under described mode of operation, the pressure cut off value of described constant pressure pump is less than the oil pressure relief value of described pressure control assembly; Under described heating mode, the pressure cut off value of described constant pressure pump is greater than the oil pressure relief value of described pressure control assembly;
Wherein, described pressure control assembly comprises relief valve and the proportion pilot pressure valve or electromagnetic proportional valve or the Manual pilot pressure valve that link to each other with the remote control mouth of this relief valve, under described mode of operation, the pressure cut off value of described constant pressure pump is lower than the oil pressure relief value of the setting of described proportion pilot pressure valve or electromagnetic proportional valve or Manual pilot pressure valve, under described heating mode, the oil pressure relief value of the setting of described proportion pilot pressure valve or electromagnetic proportional valve or Manual pilot pressure valve is downgraded is lower than described pressure cut off value; Perhaps described pressure control assembly comprises the multistage overflow valve group, this multistage overflow valve group comprises relief valve, pilot pressure valve and solenoid valve, the remote control mouth of described relief valve connects described solenoid valve import, described electromagnetic valve outlet connects described pilot pressure valve, under described heating mode, described pilot pressure valve setup pressure value is downgraded the pressure cut off value less than described constant pressure pump.
2. distribution hydraulic system according to claim 1, it is characterized in that, described distribution hydraulic system comprises temperature detection element, this temperature detection element is used for when sensing oil temperature and be lower than the first setting value, should distribute hydraulic system to switch to described heating mode by described mode of operation, and/or be used for when sensing oil temperature and be higher than the second setting value, should distributing hydraulic system to switch to described mode of operation by described heating mode, this second setting value is more than or equal to described the first setting value.
3. a pumping equipment is characterized in that, comprises the distribution hydraulic system in claim 1 or 2.
4. pumping equipment according to claim 3 is characterized in that, this pumping equipment adopts motor that power is provided.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103254190A CN102418725B (en) | 2011-10-24 | 2011-10-24 | Pumping equipment and distribution hydraulic system |
| PCT/CN2012/082690 WO2013060233A1 (en) | 2011-10-24 | 2012-10-10 | Pumping device, hydraulic distribution system and heating method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103254190A CN102418725B (en) | 2011-10-24 | 2011-10-24 | Pumping equipment and distribution hydraulic system |
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| CN102418725A CN102418725A (en) | 2012-04-18 |
| CN102418725B true CN102418725B (en) | 2013-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011103254190A Active CN102418725B (en) | 2011-10-24 | 2011-10-24 | Pumping equipment and distribution hydraulic system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102418725B (en) |
| WO (1) | WO2013060233A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102418725B (en) * | 2011-10-24 | 2013-03-20 | 中联重科股份有限公司 | Pumping equipment and distribution hydraulic system |
| CN103032421B (en) * | 2012-12-26 | 2015-04-22 | 中联重科股份有限公司 | Reversing hydraulic system, method for controlling same and concrete pumping equipment |
| CN103062166A (en) * | 2013-01-24 | 2013-04-24 | 中国铁建重工集团有限公司 | Compound pumping electro-hydraulic system |
| CN104386616A (en) * | 2014-09-18 | 2015-03-04 | 芜湖高昌液压机电技术有限公司 | Relief circuit with unloading relief valve for scissor lift |
| CN105114400B (en) * | 2015-08-27 | 2017-07-11 | 北汽福田汽车股份有限公司 | Closed type hydraulic system and its control method with preheating function |
| CN107725539A (en) * | 2017-11-16 | 2018-02-23 | 中国航空工业集团公司北京航空精密机械研究所 | A kind of ultra-precision machine tool hydraulic system oil sources heater |
| CN109281874B (en) * | 2018-12-05 | 2020-10-02 | 恒天九五重工有限公司 | Pilot hydraulic control main loop unloading system and pile press |
| CN112922929B (en) * | 2019-12-05 | 2023-04-11 | 上海智远慧智能技术股份有限公司 | AGV hydraulic jacking device and heating control method based on system overflow |
| CN112709779B (en) * | 2020-12-28 | 2023-06-27 | 太原重工股份有限公司 | Hydraulic safety buffer device for continuous rolling pipe unit |
| CN113775604B (en) * | 2021-02-19 | 2023-07-25 | 太原理工大学 | Distributed pump control system and low-pressure loss control method |
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| DE4439454A1 (en) * | 1994-11-04 | 1996-05-09 | Man Takraf Foerdertechnik Gmbh | System for preheating of hydraulic circuits |
| CN2519019Y (en) * | 2001-11-12 | 2002-10-30 | 宋锦春 | Hydraulic integrated machine for thermal recovery of heavy oil |
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| CN201486945U (en) * | 2009-09-11 | 2010-05-26 | 燕山大学 | Overflow heating device for hydraulic oil tank |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH063203B2 (en) * | 1986-03-19 | 1994-01-12 | 東洋機械金属株式会社 | Oil temperature heat-up method for hydraulically operated molding machine |
| JP2765718B2 (en) * | 1989-02-14 | 1998-06-18 | 東芝機械株式会社 | Hydraulic circuit |
| JPH08120709A (en) * | 1994-10-21 | 1996-05-14 | Hitachi Constr Mach Co Ltd | Hydraulic circuit for hydraulic work machine |
| JPH10259809A (en) * | 1997-03-21 | 1998-09-29 | Shin Caterpillar Mitsubishi Ltd | Method and device for warming-up hydraulic circuit |
| JPH11117914A (en) * | 1997-10-17 | 1999-04-27 | Komatsu Ltd | Hydraulic driving device for construction machine |
| CN102418725B (en) * | 2011-10-24 | 2013-03-20 | 中联重科股份有限公司 | Pumping equipment and distribution hydraulic system |
| CN202280696U (en) * | 2011-10-24 | 2012-06-20 | 中联重科股份有限公司 | Pumping equipment and hydraulic system |
-
2011
- 2011-10-24 CN CN2011103254190A patent/CN102418725B/en active Active
-
2012
- 2012-10-10 WO PCT/CN2012/082690 patent/WO2013060233A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4439454A1 (en) * | 1994-11-04 | 1996-05-09 | Man Takraf Foerdertechnik Gmbh | System for preheating of hydraulic circuits |
| CN2519019Y (en) * | 2001-11-12 | 2002-10-30 | 宋锦春 | Hydraulic integrated machine for thermal recovery of heavy oil |
| CN200975381Y (en) * | 2006-12-01 | 2007-11-14 | 渤海船舶重工有限责任公司 | Ship hydraulic system swap oil unit |
| CN201486945U (en) * | 2009-09-11 | 2010-05-26 | 燕山大学 | Overflow heating device for hydraulic oil tank |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102418725A (en) | 2012-04-18 |
| WO2013060233A1 (en) | 2013-05-02 |
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