CN1130726A - Line structure for preheating hydraulic circulation - Google Patents
Line structure for preheating hydraulic circulation Download PDFInfo
- Publication number
- CN1130726A CN1130726A CN95118149A CN95118149A CN1130726A CN 1130726 A CN1130726 A CN 1130726A CN 95118149 A CN95118149 A CN 95118149A CN 95118149 A CN95118149 A CN 95118149A CN 1130726 A CN1130726 A CN 1130726A
- Authority
- CN
- China
- Prior art keywords
- oil
- hydraulic
- piston rod
- fuel tank
- hydraulic cylinder
- 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.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- 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
- F15B21/045—Compensating for variations in viscosity or temperature
-
- 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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1485—Special measures for cooling or heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
- F16L53/30—Heating of pipes or pipe systems
- F16L53/32—Heating of pipes or pipe systems using hot fluids
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The preheating of hydraulic systems is prior art. It is generally done by operating the system without load until the prescribed minimum temperature is attained. However, in the known types of preheating circuits the operating elements (hydraulic cylinders) are not included. The invention relates to an arrangement in which the operating elements are included in the heating circuit. Appropriate circuits are provided for the various operating states of the hydraulic cylinder, i.e. 'neutral', 'retract piston rod' and 'extend piston rod'. The provision of an additional passageway in the piston rod through which the hydraulic oil can pass into the hydraulic cylinder is an essential feature by means of which the oil can circulate without the pressure while the system is in the neutral operating state. By using the invention, it is possible to preheat hydraulic circuits in the neutral, non-operating state, thusavoiding damage to the operating elements, increasing the lifetime of the wear parts and guaranteeing reliable operation of the hydraulic system. The inventionis suitable in particular for use in conveyor systems operating in cold regions.
Description
The present invention relates to a kind of line construction, be used for the hydraulic pressure circulation that preheating comprises drive unit, with the reliability of assurance function and work.This line construction is particularly useful for the hydraulic equipment of working under low ambient temperature, for example the conveying equipment that uses at cold area.
Known hydraulic equipment of working under low ambient temperature by preheated liquid container or pipeline and the pipeline of purge in no pressures cycle, makes this equipment be in the preparation running state.By the method and apparatus of known a kind of heating of DD-PS 268044 or cooling hydraulic tubing, wherein, for preheating, by the circuit hot air, heating one section of pipe-line system in the two-chamber passage.At this moment, hydraulic fluid is crossed this pipe-line system by the hydraulic pressure pump pressure in circulation, and keeps operating temperature.For example in the zone before the oil hydraulic cylinder, be provided with a bypass valve in abutting connection with operation mechanism in the connecting pipe between input pipeline and reflux line, reflux by this bypass valve hydraulic oil.
For avoiding operation mechanism to be subjected to uncontrollable the influence, always adopt a stop valve that input is separated with reflux line and operation mechanism.Therefore the hydraulic fluid in operation mechanism is excluded outside heating circuit.So when operation mechanism moved, the hydraulic fluid of heating flowed in the cold operation mechanism, and cause functional fault or increase wearing and tearing.Under extreme case, even may produce thermal shock, this means to produce serious stress.Have only when the even heating of equipment finishes, the function that causes is therefrom disturbed died away.
More rare and operation mechanism of short-term operation just for those, owing under cold ambient temperature, can not or just seldom can reach even heating (heat penetration), so disadvantageous operating conditions is preponderated.
Therefore, the objective of the invention is to avoid these shortcomings.
By the present invention is that to reach the measure that this purpose takes be by the described feature of claim 1 characteristic, oil hydraulic cylinder to be included in the hydraulic equipment of wanting preheating in the circulation.
This special hydraulic pressure circulation is used for following three kinds of states:
-no pressures cycle;
The withdrawal of-piston rod; And
-piston rod stretches out, and these are disclosed in the claim 2,3,4.
Advantage of the present invention is, when cold area uses conveying equipment and instrument, and for guaranteeing functional reliability and reduce wear, can the whole hydraulic system of preheating, and therefore normal operating conditions is arranged all the time.
Represented embodiments of the invention in the accompanying drawings, and elaborated below.Wherein:
Schematically illustrating of the brackets with height-adjustable of Fig. 1 conveying equipment; And
Fig. 2 is used for the circuti diagram by simple Hydraulic for lifting load device shown in Figure 1.
Fig. 1 has represented a support 1, and it for example is used for excavator, bulldozer or similar machinery as the discharging support.This support 1 can be swung in the horizontal direction by a drive unit that does not further describe, and can turn round along short transverse by oil hydraulic cylinder 2.In this case, oil hydraulic cylinder 2 is subjected to pulling load.
At the circuti diagram that is used for simple Hydraulic for lifting load device shown in Figure 2, the symbol that each functional element is used is necessary for this class circuit, and this line principle is disclosed to the professional workforce in this field work.Therefore, further specify these functional element and the mode of action in hydraulic system is unnecessary.
Also should remark additionally is characterized in, the superpressure that pressure-limit valve VD1 can not allow in being used for preventing to circulate, and the filter F that has bypass VR3 is used to clean the liquid of backflow, and throttle valve VDr1 is used to limit rate of descent.
In addition, what Special Significance was arranged also has, and the piston rod 4 of the oil hydraulic cylinder of representing with symbol M Y1 commonly used in the circuti diagram of Fig. 22 has a passage that extends longitudinally 6.
In no pressures cycle, pump P1 with oil 3 from fuel tank T through selector valve VW1; P → A is by piston rod 4 passages 6 of oil hydraulic cylinder MY1, input piston chamber 5.At this moment, safety check VR2 is open.The oil 3 that comes out at the joint A place of oil hydraulic cylinder MY1 is through the neutral position that selector valve VW2 opens; AB → T flows back to fuel tank T.
Under this situation, the hydraulic oil 3 of preheating is passed to clutch release slave cylinder MY1 with heat.In addition, the pressure of opening of safety check VR2 produces additional temperature, and this produces positive influence for whole working method.
" decline " function is by selector valve VW2 control.
For this reason, magnet a is encouraged by selector valve VW1, and forms connecting passage P → A; B → T.Meanwhile, the magnet a that has encouraged of selector valve VW1 closes no pressures cycle.
The oil 3 that comes out from selector valve VW2 flows into piston cavity 5, and this piston cavity 5 is sealed by safety check VR2 now.The pressure of being set up is opened safety check VR1 by pressure-limit valve VD2.At the oil 3 that the differential side of oil hydraulic cylinder MY1 is come out, can be through the connecting passage of selector valve VW2; B → T flows back to fuel tank T.Oil hydraulic cylinder MY1 stretches out.
When the electromagnet a of selector valve VW1 and VW2 outage, process finishes.Pilot pressure can descend by flow controller VDr2, and safety check VR1 pins oil hydraulic cylinder MY1.
" lifting, " function is by selector valve VW2 control.
For this reason, magnet 6 is encouraged by selector valve VW1, and forms connecting passage P → B, A → T.Meanwhile, the magnet a that has encouraged of selector valve VW1 closes no pressures cycle P-1, T-1.
Oil 3 comes out from the channel B of selector valve VW2, and flows into rod end chamber 7 through safety check VR1.The oil 3 that comes out from piston one side of oil hydraulic cylinder MY1 is through the connecting passage of selector valve VW2; A → T flows back to fuel tank.Oil hydraulic cylinder MY1 withdrawal.
Claims (4)
1. preheating is at the conveying equipment hydraulic pressure circuit line construction of cold area use, and by the assurance of purge pipeline in no pressures cycle functional reliability, wherein can stipulate the container of pre-deep fat, it is characterized by: one or several oil hydraulic cylinder (2) is included in the warm-up cycle, for this reason, in piston rod (4), establish additional overflow ducts (6), piston cavity (5) additionally is communicated with pipe-line system through this passage (6), by some set for this reason valves, for the withdrawal of no pressures cycle and piston rod (4) with stretch out and connect independent circulation.
2. according to the described pre-thermohydraulic circuit line construction of claim 1, it is characterized by: when no pressures cycle, by the valve in the circulation loop, make oil (3) from the passage (6) of fuel tank (T) through piston rod (4), enter in the piston cavity (5) of oil hydraulic cylinder (MY1), return in the fuel tank (T).
3. according to the described pre-thermohydraulic circuit line construction of claim 1, it is characterized by: in order to stretch out piston rod (4); Oil pump pumps into oil (3) the piston cavity (5) of oil hydraulic cylinder (MY1) from fuel tank (T), and when (anliegend) pressure that requires, oil overflow (3) can flow back to fuel tank (T) from rod end chamber (7), and, make by closeall valve and to stretch out release.
4. according to the described pre-thermohydraulic circuit line construction of claim 1, it is characterized by: for the piston rod of withdrawing (4), by hydraulic oil (3) is introduced rod end chamber (7) from fuel tank (T), meanwhile hydraulic oil (3) extrudes from piston cavity (5) and enters fuel tank (T), and, finish the withdrawal action by closeall valve.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4439454A DE4439454C2 (en) | 1994-11-04 | 1994-11-04 | Circuit arrangement for preheating hydraulic circuits |
| DEP4439454.3 | 1994-11-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1130726A true CN1130726A (en) | 1996-09-11 |
Family
ID=6532502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95118149A Pending CN1130726A (en) | 1994-11-04 | 1995-11-01 | Line structure for preheating hydraulic circulation |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN1130726A (en) |
| CA (1) | CA2161619A1 (en) |
| DE (1) | DE4439454C2 (en) |
| RU (1) | RU2140022C1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003430A (en) * | 2010-11-23 | 2011-04-06 | 莱芜钢铁股份有限公司 | Hydraulic cylinder |
| CN102893038A (en) * | 2010-12-21 | 2013-01-23 | 株式会社小松制作所 | Pipelayer and preheating method thereof |
| CN110513361A (en) * | 2019-09-02 | 2019-11-29 | 柳州柳工挖掘机有限公司 | Construction machinery hydraulic system and hydraulic oil method for controlling temperature rise |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19627974C2 (en) * | 1996-07-11 | 2003-02-06 | Getrag Getriebe Zahnrad | Hydraulic actuator and method for bleeding a hydraulic actuator |
| JP2003097516A (en) | 2001-09-25 | 2003-04-03 | Hitachi Ltd | Hydraulic device |
| DE10230860A1 (en) * | 2002-07-09 | 2004-01-22 | Zf Friedrichshafen Ag | Hydraulic fluid system for a hydraulic control unit comprises a hydraulic fluid filter is arranged between a pressure control valve and a hydraulic fluid reservoir |
| DE10313487A1 (en) | 2003-03-26 | 2004-10-14 | Zf Friedrichshafen Ag | Hydraulic system for driving load, has pressure fluid source that pumps out fluid from fluid reservoir to actuate loads, in which each load has pressure fluid supply lines that connect to pressure fluid source based on actuation of load |
| US8327562B2 (en) | 2007-06-29 | 2012-12-11 | Vermeer Manufacturing Company | Hydraulic system with thermal shock protection |
| DE502009000490D1 (en) | 2009-06-29 | 2011-05-05 | Joseph Voegele Ag | Self-propelled 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 thereof |
| CN102788050A (en) * | 2012-07-27 | 2012-11-21 | 柳州柳工挖掘机有限公司 | Oil changing and buffering device and pilot hydraulic control system with same |
| DE102013221082A1 (en) * | 2013-10-17 | 2015-04-23 | Robert Bosch Gmbh | hydraulic cylinders |
| CA2879269C (en) | 2014-01-20 | 2021-11-09 | Posi-Plus Technologies Inc. | Hydraulic system for extreme climates |
| RU2555095C1 (en) * | 2014-02-25 | 2015-07-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тюменский государственный нефтегазовый университет" (ТюмГНГУ) | Hydrocylinder with movable piston part |
| AT514919B1 (en) * | 2014-06-25 | 2015-05-15 | Avl List Gmbh | METHOD FOR OPERATING AN AUTOMATIC TRANSMISSION OR A DOUBLE COUPLING GEARBOX |
| FR3044054B1 (en) * | 2015-11-20 | 2018-08-10 | Db Industries | AUTOMATIC RINSING DEVICE FOR HYDRAULIC CYLINDERS WITH DOUBLE EFFECT |
| NL2017106B1 (en) * | 2016-07-05 | 2017-06-13 | Fugro N V | Unmanned underwater vehicle and method for controlling hydraulic system |
| CN113309747B (en) * | 2021-06-24 | 2024-09-13 | 陕西法士特齿轮有限责任公司 | Hydraulic valve block temperature control simulation system and test method for hydraulic automatic transmission |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CS237612B1 (en) * | 1983-01-31 | 1985-09-17 | Ladislav Rach | Wiring diagram for temperature regulation of working liquid |
| DD268044A1 (en) * | 1987-12-11 | 1989-05-17 | Verlade Und Transportanlagen P | METHOD AND DEVICE FOR HEATING OR COOLING HYDRAULIC PIPING |
-
1994
- 1994-11-04 DE DE4439454A patent/DE4439454C2/en not_active Expired - Fee Related
-
1995
- 1995-10-27 CA CA002161619A patent/CA2161619A1/en not_active Abandoned
- 1995-11-01 CN CN95118149A patent/CN1130726A/en active Pending
- 1995-11-02 RU RU95118728A patent/RU2140022C1/en active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003430A (en) * | 2010-11-23 | 2011-04-06 | 莱芜钢铁股份有限公司 | Hydraulic cylinder |
| CN102003430B (en) * | 2010-11-23 | 2013-01-02 | 山东钢铁股份有限公司 | Hydraulic cylinder |
| CN102893038A (en) * | 2010-12-21 | 2013-01-23 | 株式会社小松制作所 | Pipelayer and preheating method thereof |
| CN102893038B (en) * | 2010-12-21 | 2015-02-11 | 株式会社小松制作所 | Pipelayer and preheating method thereof |
| CN110513361A (en) * | 2019-09-02 | 2019-11-29 | 柳州柳工挖掘机有限公司 | Construction machinery hydraulic system and hydraulic oil method for controlling temperature rise |
Also Published As
| Publication number | Publication date |
|---|---|
| RU2140022C1 (en) | 1999-10-20 |
| CA2161619A1 (en) | 1996-03-12 |
| DE4439454C2 (en) | 1997-09-04 |
| DE4439454A1 (en) | 1996-05-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |