EP1254319A1 - Device for saving energy in working appliances that can be actuated hydraulically - Google Patents
Device for saving energy in working appliances that can be actuated hydraulicallyInfo
- Publication number
- EP1254319A1 EP1254319A1 EP01900392A EP01900392A EP1254319A1 EP 1254319 A1 EP1254319 A1 EP 1254319A1 EP 01900392 A EP01900392 A EP 01900392A EP 01900392 A EP01900392 A EP 01900392A EP 1254319 A1 EP1254319 A1 EP 1254319A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fluid
- piston
- working
- gas
- piston accumulator
- 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.)
- Granted
Links
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
- F15B21/14—Energy-recuperation means
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
-
- 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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
-
- 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
- F15B2201/00—Accumulators
- F15B2201/30—Accumulator separating means
- F15B2201/32—Accumulator separating means having multiple separating means, e.g. with an auxiliary piston sliding within a main piston, multiple membranes or combinations thereof
Definitions
- the invention relates to a device for saving energy in hydraulically actuated work tools with a piston accumulator, with a housing in which at least two longitudinally movable pistons are arranged, each of which is connected to one another by an opposing piston via a coupling part which is longitudinally displaceably guided in a partition wall of the housing which delimits spaces with the two pistons located opposite one another, at least one of the pistons at least partially delimiting a prestressing space with a predeterminable internal gas pressure, and with a fluid control which is connected to a fluid supply and by means of which the working equipment can be controlled for a work process via a fluid circuit is.
- a generic energy saving and recovery device is known from EP 0 897 480.
- the pistons of the piston accumulator which are positively coupled to one another via the coupling part, result in a decreasing preload space within the piston accumulator in one direction of travel with a simultaneous increase in the internal gas pressure, which decreases in the sense of relaxation as soon as the pistons in the other direction of travel with an increase in the volume of the preload - move space.
- the amount of gas enclosed in the prestressing space forms a kind of energy store comparable to a mechanical spring, and the kinetic energy of the working equipment introduced into the store by the movement can be called up again.
- the known double piston accumulator described above for the energy saving device, it has been shown that it is particularly economical in terms of saving to assign a medium piston or boom position of the hydraulically actuated working tool shaft to a high internal gas pressure in the prestressing space, which is derived from this means would be relaxed under the release of energy, if the boom may need to be lifted under load.
- the energy saving device mentioned need not be limited to working machines such as excavators or the like, but can also be used in hydraulic brake systems, in elevators and in hydraulic motors or the like. Find use. In these cases, it is expedient to provide a large volume for the prestressing space in order to achieve a low spring constant. To achieve this, it has already been proposed in the known solution to connect the prestressing space to a further gas supply device, in particular in the form of a nitrogen store, as a buffer.
- the piston accumulator as a central part of the energy saving and recovery device, is permanently connected to the working equipment, so that energy is continuously stored in the piston accumulator depending on the working movement of the working equipment and is retrieved from there.
- the corresponding one has become permanently connected Energy saving and recovery device proved to be disadvantageous in certain work situations, although otherwise the energy recovery can be rated as very good in terms of its efficiency.
- the object of the invention is therefore to further improve the known device to the effect that it is in use when actuation of the implement device in normal working mode makes this appear necessary and that
- the fluid control has a control device by means of which the piston accumulator in the fluid circuit of the working equipment can be switched on or off and that the control device for the relevant switching operations a monitoring device that detects at least the system status of the working equipment and / or the piston accumulator, it is possible, depending on the working position of the boom and thus the working equipment, and with regard to special applications, such as shaking or lifting with the boom, which are then not required and, if necessary, even to disconnect disruptive energy saving and recovery device from the fluid circuit with the working equipment and without carrying out the special working operation.
- connection and disconnection processes for the energy saving and recovery device can be carried out manually by an operator of the working machine, but this is preferably done automatically by the monitoring device detecting the system state of the working equipment and / or the piston accumulator and accordingly using the fluid control with the Control device controls the piston accumulator as an energy saving and recovery device.
- the design for energy saving and energy recovery can be designed for a predeterminable partial working area of the working machine, which, for example, requires the highest pressure for a working process for the working equipment.
- the device according to the invention can be made very small in size and that existing machines can be retrofitted with the energy saving and recovery device in question. The retrofitting can be done regardless of the cylinder size of the working cylinder of the implement. This means that series retrofitting of machines of different sizes is also easily possible.
- the control device has a controllable switching valve which is arranged in the fluid circuit between the piston accumulator and a machine control part as part of the fluid control.
- the machine control part is connected downstream of the motor-pump unit, which supplies the fluid circuit from the tank with hydraulic fluid
- various control concepts are possible on the basis of the control devices when using control pumps as hydraulic pumps.
- an increase in speed can be achieved at the same engine speed, with the hydraulic pump not having to reduce the volume flow.
- the machine can be used to reduce machine noise, which is playing an increasingly important role in the constantly increasing noise protection requirements.
- the monitoring device monitors the end position of the pistons of the piston accumulator and the working position of the implement.
- the piston of the piston accumulator is equipped with limit switches for monitoring the end position and serve for monitoring the working position of the implement either a position measuring system and / or an angle encoder and / or a pressure detection device in the fluid circuit.
- the sensor system mentioned can be used individually or, preferably, together for controlling the implement and the piston accumulator.
- the monitoring device in question can be implemented inexpensively and is reliable in operation.
- the partition wall of the piston accumulator separates a fluid space from a gas space, a piston in the fluid space dividing the latter into two fluid partial spaces and the other piston in turn separating the latter into two gas partial spaces.
- a compact design can then be achieved for the piston accumulator, because only a small amount of fluid has to be taken up to control the working equipment and because the main supply is via the fluid circuit with the machine control part via the drivable hydraulic pump.
- the addressed gas space can also be designed to be smaller because of the smaller pressure work area, which in turn benefits the mentioned compact design.
- one gas subspace can be connected to a gas supply device, the other gas subspace being vacuumed or having ambient air. Due to the connectable gas supply tion, it is possible to enlarge the preload space in the manner of a buffer, provided that a lower spring constant should prove to be favorable. If the gas sub-area is preferably provided with the ambient air and connected to the tank of the working machine, a tank pressure that may be present in the tank can be introduced into the piston accumulator via the stored ambient air and thus further increase the preload pressure, which in turn benefits the efficiency in energy storage.
- the device shown in the figure as a circuit diagram is used for energy saving and recovery in hydraulically actuated work tools, which are designated as a whole by 10.
- the device also has a piston accumulator 12, which is designed in the manner of a double piston accumulator and has a housing 14. At least two longitudinally movable pistons 1, 6.18 are arranged in the housing 14. These are with the piston 18 which is located opposite each other or 16 firmly connected to one another via a rod-like coupling part 20.
- the coupling part 20 itself is guided longitudinally approximately in the middle in a partition 22 of the housing 14.
- the dividing wall 22 delimits a fluid space 24 and a gas space 26 with essentially the same volumes with the two pistons 16, 18 located opposite one another.
- the left-hand piston 18 seen in the direction of view of the figure delimits with the other housing 14 a partial gas chamber 28 which serves as a preload chamber and which is provided with a predeterminable internal gas pressure which corresponds to the preload pressure.
- the device furthermore has a fluid control, designated as a whole by 30, which is connected to a fluid supply of the work machine, designated as a whole by 32.
- a fluid control designated as a whole by 30
- the implement 10 can be controlled via a closed fluid circuit 34 for the respective work process.
- the fluid control 30 also has a control device 36, by means of which the piston accumulator 12 can be switched on or off in the fluid circuit 34 of the implement 10.
- the control device 36 has a monitoring device, designated 38 as a whole, for the switching operations in question, which at least detects the system states of the implement 10 and the piston accumulator 12.
- the control device 36 has a controllable switching valve 40, in particular in the form of an electrically operated 2/2 way switching valve, the spring-loaded returns to its starting position shown in the circuit diagram by itself.
- the mentioned switching valve 40 is arranged in the fluid circuit 34 between the piston accumulator 12 and a machine control part 42 as part of the fluid control 30.
- the machine control part 42 in turn has inputs for two pressure switches 44, each of which, for example, operated by hand using so-called joysticks (mechanical-hydraulic connection) enable the boom (not shown) of the implement 10 to be raised and lowered manually.
- the machine control part 42 is connected on the input side to the fluid supply, which in particular has a tank 46 and a motor hydraulic pump unit 48.
- the hydraulic pump can be designed as a control pump.
- the inlet and outlet lines between tank 46 and machine control part 42 are part of the fluid circuit 34.
- the above-mentioned monitoring device 38 monitors, among other things, the end position of the pistons 16, 18 of the piston accumulator 12 and the respective working position of the implement 10.
- the latter is provided with limit switches 50 on the end of the housing which provide an electri - Give the signal as soon as the pistons 16 or 18 have reached their respective possible final travel positions.
- the electrical signal transmission is shown in the basic illustration according to the figure via the electrical lines shown in part.
- a position measuring system 52 and an angle sensor 54 and a pressure detection device 56 which has a pressure switch which is arranged in the fluid circuit 34 between the outlet side of the switching valve 40 and the inlet side of the implement 10 in a secondary branch, are used to monitor the working position of the implement 10.
- the pressure switches show the direction of movement (up / down) of the memory.
- the measuring system 52, the win The kelmeßgeber 54 and the pressure detection device 56 can be used in combination, as shown in the circuit diagram, or depending on the requirements for the control and its convenience only used individually. Ultimately, however, they all give a statement about the state of movement and work for the work tool 10.
- the fluid space 24 is divided by the piston 16 into two fluid subspaces 24a, b; this also applies to the gas space 26, which is divided into two gas subspaces 26a, b by the other piston 28.
- the one gas subspace 26a is equal to the prestressing space 28 with a predetermined internal gas pressure.
- a gas supply device 60 in particular filled with nitrogen, can be connected to the gas subspace 26a or the prestressing space 28 via a valve device 58.
- the other gas subspace 26b is either vacuumed or, as shown, can be connected via a connection device 62 and thus has ambient air. In an embodiment not shown in detail, it is also possible to connect the gas subspace 26b to the tank 46.
- the relevant preload pressure can be passed on to the gas subspace 26b.
- the working equipment 10 has two hydraulic working cylinders 64, which are customary for such working machines.
- the two working cylinders 64 are connected to one another in a fluid-carrying manner on the rod side 66 as well as on the piston side 68 via corresponding fluid lines.
- the rod side 66 is in turn connected to the machine control part 42 in a fluid-carrying manner and the piston side 68 is fluid-carrying in connection with the control device 36 with a switching valve 40. Furthermore, the control device 36 is connected in a fluid-carrying manner to the piston accumulator 12 and to the machine control part 42, in particular via the switching valve 40 the two fluid subspaces 24a, 24b. According to the switching diagram, the switching valve 40 is shown in the unactuated state, the fluid flow from the machine control part 42 to the piston accumulator 12 being blocked, but being made to the piston side 68 of the implement 10.
- fluid is then routed from the machine control part 42 to the piston accumulator 12, in particular to the fluid subspace 24a, and furthermore the piston side 68 of the implement 10 is in fluid communication with the fluid subspace 24b of the piston accumulator.
- the piston side 68 of the implement 10 is in fluid communication with the fluid subspace 24b of the piston accumulator.
- the device according to the invention will now be explained in more detail based on its function. If the switching valve 40 is not actuated in its initial state in accordance with the switching diagram shown, the machine control part 42 supplies the piston side 68 of the two working cylinders 64 via the fluid supply 32 and the working device 10 with its boom extends, that is to say it is moved upward in the direction of view of the switching diagram. The displaced fluid from the rod-side fluid spaces of the two working cylinders 64 is then returned, bypassing the switching valve 40, directly to the machine control part 42 and from there into the tank 46.
- the monitoring device 38 with its individual sensors and the piston accumulator 1 2 is connected to the fluid circuit 34 as an energy saving and recovery device.
- the switching valve 40 is switched on via the control device 36 in the energetically sensible area and, when viewed in the direction of the switching diagram, assumes its right switching position with crossed fluid paths.
- the piston side pushed fluid from the working cylinders 64 is then forwarded via the cross-fluid guide of the switching valve 40 into the fluid subspace 24b and under the action of the fluid pressure, the piston arrangement 1 6, 18 shifts to the left in the direction of view of the figure and increases the preload pressure in the preload chamber 28 or in the gas subspace 26a while increasing the volume of the gas subspace 26b.
- the amount of fluid displaced in the fluid subspace 24a during the movement of the piston 16 from right to left is displaced in the direction of the machine control part 42 and toward the tank 46 via the associated fluid line and the switching valve 40.
- the piston 18 reaches its limit switch 50 assigned to it, the work involved in taking up the piston accumulator 12 can also be switched off.
- the fluid quantity of the fluid supply 32 can be brought into the subspace 24a via the machine control part 42 and the prestressed gas volume in the prestressing space 28 or gas subspace 26a relaxes with the result that the energy previously introduced in this way is now called up from left to right during the return movement of the piston 16, and the amount of fluid ejected from the fluid subspace 24b in turn reaches the piston chamber of the delivery cylinder 64 via the switching valve 40 in a crossed switching position and thus supports the lifting process of the implement 10
- the fluid ejected on the rod side 66 in turn reaches the tank 46 via the associated fluid line and via the machine control part 42.
- the pushing-out movement movement of the piston arrangement 16, 18 can be carried out, for example, via the assigned limit switch 50 to the piston 16 and then switch off by switching on the control device 36.
- the embodiment described above can also be modified in such a way that instead of two working cylinders 64, only one working cylinder is used or, if appropriate, more than two.
- the device described above has also proven to be energetically advantageous if the boom is in a static position or is operated in the end-of-travel range.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
- Operation Control Of Excavators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10006013A DE10006013A1 (en) | 2000-02-11 | 2000-02-11 | Device for saving energy in hydraulically actuated work equipment |
DE10006013 | 2000-02-11 | ||
PCT/EP2001/000102 WO2001059309A1 (en) | 2000-02-11 | 2001-01-08 | Device for saving energy in working appliances that can be actuated hydraulically |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1254319A1 true EP1254319A1 (en) | 2002-11-06 |
EP1254319B1 EP1254319B1 (en) | 2004-04-28 |
Family
ID=7630534
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01900392A Expired - Lifetime EP1254319B1 (en) | 2000-02-11 | 2001-01-08 | Device for saving energy in working appliances that can be actuated hydraulically |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1254319B1 (en) |
AT (1) | ATE265624T1 (en) |
DE (2) | DE10006013A1 (en) |
ES (1) | ES2219494T3 (en) |
WO (1) | WO2001059309A1 (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006002566B4 (en) * | 2006-01-18 | 2014-11-13 | Eurocopter Deutschland Gmbh | hydraulic system |
DE102010032415A1 (en) * | 2010-07-27 | 2012-02-02 | Hydac Technology Gmbh | Apparatus for recovering energy |
CN107061378B (en) * | 2011-10-10 | 2019-08-02 | 阿格斯·彼特·罗伯森 | Accumulator |
DE102011120226B4 (en) | 2011-12-03 | 2013-08-14 | Hydac Fluidtechnik Gmbh | System for improving the energy efficiency of hydraulic systems |
DE102012009669B3 (en) | 2012-05-03 | 2013-08-14 | Hydac Technology Gmbh | Device for saving energy in hydraulically operated equipment |
DE102012009670A1 (en) | 2012-05-03 | 2013-11-07 | Hydac Technology Gmbh | Device for saving energy in hydraulically operated equipment |
DE102012009668B3 (en) * | 2012-05-03 | 2013-08-14 | Hydac Technology Gmbh | Device for saving energy in hydraulically operated equipment |
FI124684B (en) * | 2012-12-03 | 2014-12-15 | Ponsse Oyj | Crane |
CN103174687B (en) * | 2013-03-25 | 2015-06-17 | 王文雯 | Pressurized and energy storing type energy-saving hydraulic pumping unit |
DE102013013690A1 (en) * | 2013-08-16 | 2015-02-19 | Hydac Technology Gmbh | System for automatically adapting a predefinable amount of gas input and actuating device with such a system |
RU2558073C1 (en) * | 2014-03-03 | 2015-07-27 | Владимир Никитич Тарасов | Energy-saving device of work equipment of boom machine |
CN108436006B (en) * | 2018-03-26 | 2019-04-12 | 中科聚信洁能热锻装备研发股份有限公司 | A kind of free-forging hydraulic of efficient driving |
US11662017B2 (en) | 2020-06-25 | 2023-05-30 | Deere & Company | Systems and methods for pressurizing transmission charge oil |
DE202022101057U1 (en) * | 2022-02-24 | 2022-03-08 | Timur Serbay | Hydraulic actuating device for a hydraulically operated implement |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3206162A1 (en) * | 1982-02-20 | 1983-09-01 | Hartmann & Lämmle GmbH & Co KG, 7255 Rutesheim | DRIVE FOR A MOVABLE DIMENSION BY MEANS OF A HYDROMOTOR |
JP2628397B2 (en) * | 1990-04-25 | 1997-07-09 | 回生工業株式会社 | Speed control method of hydraulic elevator using inverter power supply |
DE19528558B4 (en) * | 1995-08-03 | 2006-10-05 | Dieffenbacher Gmbh + Co. Kg | Method for operating a hydraulic press and apparatus for carrying out the method |
DE19617950A1 (en) | 1996-05-04 | 1997-11-13 | Hydac Technology Gmbh | Piston accumulator with gas preload |
JP2002519597A (en) * | 1998-06-27 | 2002-07-02 | ブラーン,ラーズ | Mobile work machine |
-
2000
- 2000-02-11 DE DE10006013A patent/DE10006013A1/en not_active Ceased
-
2001
- 2001-01-08 AT AT01900392T patent/ATE265624T1/en active
- 2001-01-08 WO PCT/EP2001/000102 patent/WO2001059309A1/en active IP Right Grant
- 2001-01-08 DE DE50102128T patent/DE50102128D1/en not_active Expired - Lifetime
- 2001-01-08 EP EP01900392A patent/EP1254319B1/en not_active Expired - Lifetime
- 2001-01-08 ES ES01900392T patent/ES2219494T3/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0159309A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2001059309A1 (en) | 2001-08-16 |
EP1254319B1 (en) | 2004-04-28 |
DE50102128D1 (en) | 2004-06-03 |
ATE265624T1 (en) | 2004-05-15 |
ES2219494T3 (en) | 2004-12-01 |
DE10006013A1 (en) | 2001-08-23 |
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