• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a hydraulic energy recovery device of a working machine, provided with at least one differential cylinder, and a corresponding working machine.
    公开号:FR3048037A1
    申请号:FR1751037
    申请日:2017-02-08
    公开日:2017-08-25
    发明作者:Philipp Hahn；Volker Gliniorz；Guillaume Bonnetot
    申请人:Liebherr Mining Equipment Colmar SAS；
    IPC主号:
    专利说明:

    The invention relates to a hydraulic energy recovery device, and a working machine provided with a corresponding device.
    By the known connection of hydraulic cylinders to mobile working machines, the entry of hydraulic cylinders under a heavier load (eg lowering of stroke without pressure) will be achieved via throttling control. In this case, the potential energy, which is defined by the load on the cylinder, is converted into heat by constricting the volume flow under pressure. The existing potential energy is destroyed by the operation. Due to the conversion into heat, a disadvantageous additional cooling capacity must be implemented inside the machine.
    A typical embodiment of the hydraulic cylinder for mobile working machines is the differential cylinder. If it returns with a throttle control and a heavier load, it must be ensured that a filling of the rod side cylinder chamber is guaranteed. This is possible by activating a corresponding supply flow rate by the work pumps. In addition or alternatively, a corresponding filling of the rod-side cylinder chambers can take place via recirculation of the strangulated volume flow. By re-circulating the strangulated volume flow, a division of the volume flow rate in accordance with the surface ratio of the hydraulic cylinders or in accordance with the volume ratio of the chambers of the hydraulic cylinder is provided. In this case, a portion of the volume flow circulates in the rod side chambers of the cylinders and the other part is directed into the tank.
    If the potential energy released by the descent stroke of the lift cylinders must be stored, it is therefore interesting to store as much of the existing energy as possible. In hydraulics, this corresponds to volume flows as large as possible under the highest possible pressure. Known hydraulic connections, which recirculate a portion of the bottom volume flow rate in the rod side chambers of the hydraulic cylinders, reduce the flow rate that can be made available for storage.
    Different solutions currently exist for storing potential energy by lowering the boom of mobile work machines.
    A solution is described in document US 2013/0 081 383, in which one of two jacks is used for energy storage. Here, a volumetric machine is used in closed circuit, to fill the chambers rod side of the two cylinders with the amount of return of the second cylinder. A disadvantage of the invention described therein is the non-existent exchange of oil on the bottom side of the hydraulic cylinder which is linked to the storage. The volume of oil is only displaced between the hydraulic storage and the bottom side of the cylinder.
    In a connection of the document DE 10 2012 009 668, a hydraulic pump is used when the cylinders enter, to ensure the filling of the rod-side chambers. The filling by the application of a hydraulic power does not correspond to an energetically efficient control of the hydraulic consumers. The absoprtion of the potential energy of the boom by a cylinder filled with gas is also possible (DE 10 2010 051 665). In the context of this invention, the additional integration of a gas cylinder into the machine is necessary, which means a high integration expense.
    To supply the stored hydraulic energy, various possibilities currently exist. Document 2013/180 605 describes the direct supply in the fan cycle of the machine. Based on the point of operation of the fan cycle, it is necessary to throttle the volume flow rate from the hydraulic storage to the fan cycle. In this case, throttling losses are generated, and thus the amount of reusable hydraulic energy is reduced.
    The possibility of using stored hydraulic energy directly for the supply of working pumps still exists. This is described in DE 10 2005 052 108. In this case, a circuit which links the suction side of the working pump to the hydraulic reservoir or the hydraulic storage is necessary. If the pump is not powered by the hydraulic storage, pressure losses occur through the valve, which can influence the suction pressure of the pump and can thus cause adverse operating conditions. In addition, cooling and filtering must be provided between a hydraulic storage and a suction.
    Known hydraulic connections may have the following inherent disadvantages: • The potential energy of the downstroke is destroyed by the throttling operation, and can not be used for other processes. • The potential energy of the downstroke is provided as heat energy in the hydraulic system and must then be evacuated by corresponding cooling devices. These processes are also energy consumers. • Sustaining the bottom volume flow by lowering the lift cylinder results in a reduction in the potential for energy that can be stored.
    Because of this problem, it is an object of the invention to store the potential energy that is defined by the heavy load on the hydraulic cylinders or on the hydraulic cylinder, and possibly to ensure an energy-efficient filling of the rod-side chambers. hydraulic cylinders. In this way, the amount of potential energy that can be stored is maximized, which can be used for other tasks in the work machine. In addition, the cooling used can be reduced, since through the cooling system of the machine, less waste heat must be removed. On this basis, the overall operation of the hydraulic working machine can be designed energetically more efficient.
    This object will be achieved according to the invention by a hydraulic energy recovery device of a working machine having at least one differential cylinder. Advantageous embodiments of the invention are also described.
    The hydraulic energy recovery device by the working machine equipped with at least the differential cylinder is therefore provided, wherein the device comprises at least one storage device having at least one high pressure accumulator and at least one low accumulator pressure for energy storage of the potential energy of the at least one differential cylinder entering under a heavier load.
    It is preferably provided that the device comprises at least one regeneration connection for a recirculation of hydraulic fluid in the rod side of the differential cylinder, so that the regeneration connection and the storage device are arranged in particular parallel to each other. to one another, and / or in that the accumulators are each coupled to the differential cylinder via a single valve and corresponding conduits.
    The provision of two accumulators with a different pressure level is necessary for the storage of energy (storage circuit). For operation of the storage facility, oil under high pressure, which escapes from the bottom side of the differential cylinder, is stored in the high pressure accumulator. The oil must be fed at the rod end through the cylinder inlet. This occurs via the oil volume output of the low pressure accumulator. Both accumulators (low pressure and high pressure accumulators) operate in parallel during the storage process.
    In another favorable arrangement, it is conceivable that via the regeneration connection, hydraulic fluid flows out of the low pressure accumulator and / or outside the bottom side of the differential cylinder into its stem side. The concept of recovery device or recovery connection may be related to the storage of energy in the accumulators. The concept of regeneration connection specifically describes the recirculation of hydraulic fluid in the rod side of the differential cylinder.
    In another favorable arrangement, the hydraulic liquid flows into the throttle stem inlet in a throttled manner and / or the energy recovery occurs over the entire inlet channel or only a portion of the inlet channel of the jack differential. By the constriction of the hydraulic fluid, it is possible to adjust for example the hydraulic fluid leaving the bottom of the differential cylinder to the pressure variations of the rod side of the differential cylinder, and thus adjusted, to lead from the bottom side to the rod side . In general, the throttle is used to bring hydraulic fluid from the bottom side of the differential cylinder into the rod side of the differential cylinder.
    In another advantageous arrangement, it is conceivable that an assistance motor connected to the high pressure accumulator is provided, for a power supply in the kinematic chain of the working machine. In this way, energy recovery occurs independently of the other usual devices of the work machine, which thus converts pressure energy into displacement energy, which can be supplied to other peripheral devices of the work machine.
    In another advantageous arrangement, the assistance motor is configured in the form of a proportional motor, a commutator-controlled motor or a motor having a constant absorption volume and / or the accumulator is configured as a bladder accumulator, a piston accumulator, a diaphragm accumulator or a spring accumulator. The invention also relates to a working machine, in particular a shovel equipped with a device as described above, so that it is in particular possible to provide that the device is not necessary for the normal operation of the machine. job. The device can also be coupled later in the form of an add-on solution with the working machine if not fully operational. Other details and advantages of the invention are specified in the embodiment shown by way of example in the single figure.
    Fig. 1 shows the schematic hydraulic cycle of an exemplary embodiment of the invention described herein. The exemplary embodiment is distinguished by the fact that one or more differential cylinders 1 under a heavier load can be introduced, and that at the same time the existing potential energy can be stored largely using at least two hydraulic accumulators. The exemplary embodiment is further distinguished by the fact that one or more differential cylinders 1 under a heavier load can be introduced, and at the same time by the fact that the filling of the rod sides 2 of the cylinders 1 can be done in an energy efficient way. This is achieved by the fact that one or more low pressure accumulators 6 can be connected to the rod sides 2 of the differential cylinders 1 during the introduction process. The exemplary embodiment is further distinguished by the fact that one or more differential cylinders 1 under a heavier load can be introduced, without the hydraulic accumulators 6, 19 and the hydraulic valve being activated for the accumulation of potential energy, or for feeding the rod sides. This is achieved by the fact that the illustrated hydraulic circuit has a regeneration connection, which throttles the bottom side oil flow rate and drives the corresponding oil volume flow from the shaft sides 2. The exemplary embodiment is further distinguished by the fact that by the combination of the connection of the differential cylinder 1 with the hydraulic accumulators 6, 19 to store energy, to supply the rod side, and the regeneration connection, it is possible that the process of energy storage intervenes only on part of the input channel of the differential cylinder 1 under a heavier load. The exemplary embodiment is also distinguished in that the stored energy of the descent operation of the differential cylinder 1 or of several differential cylinders 1 can be reused. This is achieved by the fact that a hydraulic motor 15 or rather an assistance motor 15 can be connected to the high pressure accumulator 19, and the energy contained in the upper pressure accumulator 19 can be injected to support the source. primary drive (diesel engine or electric motor 16) powertrain machines. The exemplary embodiment is further distinguished in that it can be integrated into the powertrain of a machine without influencing the functions of the powertrain, so that all the operating capacity of the machine is dependent on the invention. This means that the machine can also be operated perfectly without the operating capability of the invention.
    With the commissioning of the machine, the high pressure accumulator 19 and the low pressure accumulator 6 regulate the respective pressure variations. Before the first storage process can be started, the upper working pressure of the low pressure accumulator 6 must reign in the low pressure accumulator 6, which will be achieved by a corresponding guidance of a quantity of oil in the low pressure accumulator 6. For this, the differential cylinder 1 can be deployed. This takes place by the production of a volume flow by means of the working pump 14, and a corresponding control of the control spool 11. During this movement, the shutoff valve 10 is closed and the total volume flow outflow from the rod side 2 of the differential cylinder 1 will be led through the low pressure storage valve 7 in the low pressure accumulator 6. If the upper operating pressure of the low pressure accumulator 6 is reached, the valve of stop 10 is open and the low pressure storage valve 7 is closed. The volume flow leaving the rod side 2 of the differential cylinder 1 is then led above the control spool 11 back into the reservoir 13.
    If the storage process has to be started, an external force must be exerted at the differential cylinder 1, which acts for the inlet of the cylinder 1. In this way, a pressure is established at the bottom side 4 of the differential cylinder 1 , which defines the existing potential energy. This potential energy must be taken by the high-pressure accumulator 19. By means of the hydraulic high-pressure accumulator valve 20 and capable of a proportional adjustment, a connection is provided between the bottom side 4 of the differential cylinder 1 and the high-pressure accumulator 19. By means of the hydraulic high-pressure accumulator valve 20 and capable of a proportional adjustment, a connection is provided between the rod side 2 of the differential cylinder 1 and the high-pressure accumulator 19. By the proportional adjustment of the high pressure accumulator valve 20, the input speed of the differential cylinder 1 can be adjusted. During the input movement of the differential cylinder 1, the volume flow leaving the bottom side 4 of the differential cylinder 1 is driven by the high pressure accumulator valve 20 in the high pressure accumulator 19, and leads to a pressure increase. By the input movement of the differential cylinder 1, the volume of the chamber 2 rod side of the differential cylinder 1 is growing. The filling of the necessary quantity of oil is made possible by means of the low pressure accumulator valve 7 from the low pressure accumulator 6.
    If the input movement of the differential cylinder 1 is stopped, then the high pressure accumulator valve 20 and the low pressure accumulator valve 7 are closed. The high-pressure accumulator 19 now contains the volume of oil which is under pressure and which during the input movement of the differential cylinder 1 has been released from the bottom side 4 of the differential cylinder 1.
    With the conclusion of the storage process, the working pressure in the low pressure accumulator 6 is lowered, since the corresponding volume of oil has been driven from the low pressure accumulator 6, via the low pressure accumulator valve 7, to the rod side 2 of the differential cylinder 1.
    In the working cycle of the machine, following an output movement of the differential cylinder 1, by a corresponding command of the working pump 14 and the control spool 11, the shut-off valve 10 is closed and the total flow rate from the rod side 2 of the differential cylinder 1 is conducted through the low pressure accumulator valve 7 into the low pressure accumulator 6. If the upper operating pressure of the low pressure accumulator 6 is reached, the shut-off valve 10 is open and the low-pressure storage valve 7 is closed. The volume flow leaving the rod side 2 of the differential cylinder 1 is then led above the control spool 11 back into the reservoir 13.
    Depending on the size of the low pressure accumulator 6 and the high pressure accumulator 19, a storage of the potential energy on all or part of the stroke of the differential cylinder 1 is possible If the hydraulic accumulators 6 and 19 are designed only for part of the stroke of the differential cylinder 1 and if the input movement of the differential cylinder 1 is to take place further than the design of the hydraulic accumulators 6 and 19 permits, a regeneration connection is used. This comprises the brake valve 8, which is connected to the bottom side 4 of the differential cylinder 1, the non-return valve 9 and the discharge valve 12. By the proportional adjustment of the brake valve 8, the volume flow from the chamber the bottom end 4 of the differential cylinder 1 is led through the non-return valve 9 into the shaft side chamber 2 of the differential cylinder 1. The amount of excess oil leaving the bottom side 4 of the differential cylinder 1 is driven by the discharge pressure adjustable in the tank 13. In this way, the regeneration connection ensures that the input of the differential cylinder 1 is also possible when a fault exists at the level of the low pressure accumulator 6 and / or of the low-pressure accumulator 19, or if the low-pressure accumulator 6, after the machine has been put into service, has not yet been prestressed to its higher working pressure.
    After the storage process, the energy of the volume of pressurized oil in the high pressure accumulator 19 can again be introduced into the powertrain of the machine. For this, the assistance motor 15 will be connected to the high pressure accumulator 19 via the hydraulic assistance motor valve 18. The assistance motor 15 can be connected directly to the transfer case 17 of the machine, and be driven with a rotational speed provided by the drive motor 16. Depending on the volume absorbed by the power assist motor 15 is then introduced into the powertrain of the machine, corresponding to the operating states of the In the conclusion of the introduction process, the assist motor valve 18 is closed, and thus the connection between the high pressure accumulator 19 and the assistance motor 15 is disconnected.
    In the work cycle of the machine, if an input movement of the differential cylinder 1 occurs, through which the volume flow of the working pump 14, by a corresponding control of the control spool 11, is driven on the rod side 2 of the differential cylinder 1, the low pressure accumulator valve 7 will be kept closed, and the stop valve will be kept open.
    In the cycle intervene at least one working pump and at least one control spool.
    As a hydraulic accumulator, all types of hydraulic accumulators can be used. Embodiments are conceivable in the form of a bladder accumulator, a piston accumulator, a membrane accumulator or a spring accumulator. The invention is also not limited to one type of energy storage medium. Bladder accumulators and piston accumulators use mostly nitrogen or mixtures containing nitrogen.
    Combinations of different types of accumulator can also be used for the practice of the present invention.
    The valves shown can be used in the form of individual 2/2-way valves or also as a combination on a valve stem. In this case, proportional or switching control is also possible.
    The assist motor can be used as an embodiment to be used with an absorption volume susceptible to a propotional setting or a switching setting, or also constant.
    As shown, the assist motor 15 can be arranged directly on the transfer case of the machine. It is also conceivable that the assist motor 15 is mounted on other rotating units as well as directly on the drive motor. 1. Lift cylinder 2. Cylinder chamber rod side 3. Rod lifting cylinder connection 4. Cylinder chamber bottom side 5. Bottom lift cylinder connection 6. Low pressure accumulator 7. Battery valve Low pressure 8. Brake valve 9. Non-return valve 10. Shut-off valve 11. Control drawer 12. Discharge valve 13. Tank 14. Working pump 15. Support motor 16. Drive motor 17 Transfer box 18. Support motor valve 19. High pressure accumulator 20. High pressure accumulator valve
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    claims
    Hydraulic energy recovery device by a working machine provided with at least one differential cylinder (1), wherein the device comprises at least one storage device having at least one high-pressure accumulator (19) and at least one a low pressure accumulator (6) for energy storage of the potential energy of the differential cylinder (1) entering under a heavier load.
    [2" id="c-fr-0002]
    2. Device according to claim 1, characterized in that the device comprises at least one regeneration connection for a recirculation of hydraulic fluid on the rod side (2) of the differential cylinder, wherein the regeneration connection and the storage device are arranged in particular parallel to one another, and / or in that the accumulators (6, 19) are each coupled to the differential jack via a single valve (7, 20) and corresponding lines .
    [3" id="c-fr-0003]
    3. Device according to claim 2, characterized in that through the regeneration connection, hydraulic fluid flows to the outside of the low pressure accumulator (6) and / or outside the bottom side. (4) the differential cylinder (1) into its rod side (2).
    [4" id="c-fr-0004]
    4. Device according to claim 2 or 3, characterized in that the hydraulic fluid flows into the rod side (2) strangely.
    [5" id="c-fr-0005]
    5. Device according to any one of the preceding claims, characterized in that the energy recovery occurs on the entire input channel or only on a portion of the input channel of the differential cylinder (1).
    [6" id="c-fr-0006]
    6. Device according to any one of the preceding claims, characterized in that an assistance motor (15) connected to the high pressure accumulator (19) is provided for a power supply in the kinematic chain of the machine. working.
    [7" id="c-fr-0007]
    Device according to claim 5, characterized in that the assist motor (15) is configured as a proportionally adjustable motor, a commutator-controlled motor or a motor having a volume of constant absorption.
    [8" id="c-fr-0008]
    8. Device according to any one of the preceding claims, characterized in that the hydraulic accumulator (6, 19) is configured in the form of a bladder accumulator, a piston accumulator, a membrane accumulator or a spring battery.
    [9" id="c-fr-0009]
    9. Working machine, in particular shovel, provided with a device according to any one of claims 1 to 8.
    [10" id="c-fr-0010]
    10. Work machine according to claim 8, characterized in that the device is not necessary for the normal operation of the working machine.
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    同族专利:
    公开号 | 公开日
    AU2017200806A1|2017-09-07|
    US20170241454A1|2017-08-24|
    DE102016002134A1|2017-08-24|
    FR3048037B1|2020-07-10|
    US10352338B2|2019-07-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    DE10118746B4|2001-04-17|2004-06-24|Siemens Ag|Method for operating a switching device with a switchable current limiter and associated arrangement|
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    法律状态:
    2018-02-27| PLFP| Fee payment|Year of fee payment: 2 |
    2020-02-19| PLFP| Fee payment|Year of fee payment: 4 |
    2021-03-10| PLFP| Fee payment|Year of fee payment: 5 |
    2022-02-19| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102016002134.9|2016-02-23|
    DE102016002134.9A|DE102016002134A1|2016-02-23|2016-02-23|Device for recuperation of hydraulic energy and working machine with appropriate device|
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