EP3789612A1 - Appareil hydraulique portable fonctionnant sur accumulateur pour outils de sauvetage hydraulique - Google Patents

Appareil hydraulique portable fonctionnant sur accumulateur pour outils de sauvetage hydraulique Download PDF

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Publication number
EP3789612A1
EP3789612A1 EP20194093.9A EP20194093A EP3789612A1 EP 3789612 A1 EP3789612 A1 EP 3789612A1 EP 20194093 A EP20194093 A EP 20194093A EP 3789612 A1 EP3789612 A1 EP 3789612A1
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EP
European Patent Office
Prior art keywords
hydraulic
pressure
response
control device
relief valve
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
Application number
EP20194093.9A
Other languages
German (de)
English (en)
Other versions
EP3789612B1 (fr
Inventor
Stefan Infanger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weber Hydraulik GmbH Austria
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Weber Hydraulik GmbH Austria
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Publication date
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Publication of EP3789612A1 publication Critical patent/EP3789612A1/fr
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Classifications

    • 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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
    • F15B11/0423—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in" by controlling pump output or bypass, other than to maintain constant speed
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B3/00—Devices or single parts for facilitating escape from buildings or the like, e.g. protection shields, protection screens; Portable devices for preventing smoke penetrating into distinct parts of buildings
    • A62B3/005—Rescue tools with forcing action
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/005—Hydraulic driving means
    • 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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/06—Mobile combinations
    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
    • 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
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0209—Rotational speed
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20507—Type of prime mover
    • F15B2211/20515—Electric motor
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/275—Control of the prime mover, e.g. hydraulic control
    • 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

Definitions

  • the invention relates to a portable, battery-operated hydraulic unit for hydraulic rescue tools, in particular for spreading and / or scissors tools, as well as a method for operating a portable, battery-operated hydraulic unit, as specified in the claims.
  • Hydraulic rescue tools are known in particular as spreading and / or scissor tools and are typically used by rescue organizations, such as the fire brigade or the technical support service, but also used by special task forces. In order to achieve a rapid readiness for use of such rescue or deployment tools, efforts are made to make these technical aids portable or portable and thus to implement them as lightweight as possible.
  • the hydraulic units for activating the hydraulic rescue tools can increasingly be operated by electrochemical energy stores, in particular by accumulators.
  • Battery-operated hydraulic units of the generic type for hydraulic rescue tools which hydraulic units are intended to be portable or operable by only one person, are available from the applicant in a number of designs.
  • the respective hydraulically operated rescue tools are permanently or interchangeably attached or mounted on the portable, battery-operated hydraulic unit and thus form a one-piece unit or the portable, battery-operated hydraulic units are designed as separate devices and can be connected to the respective rescue tool via hydraulic hose connections.
  • the hydraulic rescue equipment When the hydraulic rescue equipment reaches its end position or when it jams due to the operating conditions or when the available force is no longer sufficient for a work movement, the excess pressure generated by the hydraulic pump is reduced via the response of a pressure relief valve. In addition to undesirable hydraulic power loss, this usually results in high noise and heat emissions.
  • economical and efficient use of the available battery power is of great importance and often decisive for a successful operation.
  • the task of economical and efficient utilization of the battery life according to the state of the art is usually achieved by structurally complex and expensive load sensing systems.
  • the hydraulic pump always delivers the volume flow that is currently required by the consumer.
  • these load-sensing systems also have the disadvantage of high waste heat or high energy consumption and are subject to signs of wear and an associated unsatisfactory service life.
  • the structural complexity of these systems also has disadvantages in terms of weight, which affects their portability.
  • a control unit estimates a hydraulic pressure of the hydraulic fluid based on a drive current for the engine and a rotational speed of the engine, and performs drive control for the engine based on this estimated hydraulic pressure value.
  • EP 0718496 A2 describes an electro-hydraulic system having at least one hydraulic load that receives pressurized fluid from a pump driven by an electric motor.
  • the flow and pressure properties of the fluid are determined by the motor speed, which is set by an electronic control in response to a motor / pump parameter which is recorded in the control itself. No system parameters are recorded outside of the electronic control.
  • the DE 102015214006 A1 discloses a method for measuring the pressure that is generated by an electric motor-driven compressor, the change in the mean motor current of the electric motor driving the compressor, which is dependent on the change in pressure at the compressor outlet, being determined and used as a pressure-proportional variable for the Operation of the compressor is provided or displayed to a control device in the form of an input variable. Furthermore, the pressure measurement carried out via the mean motor current can also be used to limit the maximum pressure by a control unit. An additional mechanical pressure limitation is then no longer necessary.
  • the present invention is based on the object of creating a simple and improved, portable, battery-operated hydraulic unit, in particular of further optimizing its running time, so that complex or long rescue missions can be carried out efficiently.
  • a pressure limiting valve state detection embodied in this way can advantageously contribute to detecting the response of the pressure limiting valve in order to counteract hydraulic power loss and noise and heat emissions. These measures improve the energy efficiency of the hydraulic unit. Rescue operations that are usually time-critical and also burdensome for operators or forensic operations can thus be carried out as professionally as possible. Furthermore, the longevity of the hydraulic unit can be improved.
  • a detection means which can detect the response of the pressure limiting valve by detecting the position of a valve body.
  • a maximum pressure preset in the pressure relief valve via a compression spring is exceeded, a piston slide begins to press against the compression spring and thereby displaces the valve body.
  • the position of the valve body can advantageously be detected using an optical motion sensor or Hall sensor.
  • a change in position of the valve body can also be detected by measuring the pressure.
  • the response of the pressure relief valve is advantageously recognized immediately and without a time delay. Since the detection means according to this embodiment are arranged directly on the pressure limiting valve, the detected measurement signals are not or only slightly influenced by interfering signals.
  • a detection means is formed which can detect the response of the pressure limiting valve by detecting the power consumption of the electric motor. This has the particular advantage that no additional structural unit is required to detect the response of the pressure relief valve. The structural complexity and the production costs can thus be kept as low as possible.
  • a detection means is formed which can detect the response of the pressure limiting valve by detecting the motor current.
  • This detection device is structurally simple to implement, with the motor current usually already being detected in existing systems.
  • no additional control line required between pressure relief valve, control device and electric motor no further components or detection means have to be added, which means that the weight of the rescue device does not increase and its structural complexity does not increase.
  • An embodiment is also advantageous, according to which it can be provided that a detection means is formed which can detect the response of the pressure limiting valve by detecting the torque and the speed of the electric motor and the engine power that can be calculated therefrom.
  • This detection device can also be implemented in a comparatively simple manner, since here, too, existing detection means can be used and no additional control line is required between the pressure limiting valve, control device and electric motor.
  • a detection means is formed which can detect the response of the pressure relief valve by detecting the flow in the return line after the pressure relief valve.
  • Flow meters are standard measuring devices and can easily be integrated into existing systems. Since the flow can be measured directly after the pressure relief valve, the measurement signal is not or only slightly falsified by interfering signals.
  • a signaling means is designed which can communicate the reduction in engine speed due to the response of the pressure relief valve to the operator of the hydraulic rescue tool by means of a signal, preferably an acoustic, optical and / or haptic signal.
  • a signal preferably an acoustic, optical and / or haptic signal.
  • This further development can contribute to a reduction of the stress on the operator, since it can be communicated directly to him that the rescue device has reached an end position, is blocked, or the available force is no longer sufficient for a work movement. It can also be useful if the signal is repeated at periodic intervals as long as the pressure relief valve responds or the engine speed is reduced.
  • the response of the pressure limiting valve is detected by detecting the position of a valve body.
  • a maximum pressure preset in the pressure relief valve via a compression spring is exceeded, a piston slide begins to press against the compression spring and thereby displaces the valve body.
  • the position of the valve body can advantageously be detected using an optical motion sensor or Hall sensor.
  • a change in position of the valve body can also be detected by measuring the pressure.
  • the response of the pressure limiting valve is advantageously recognized immediately and without delay and thus enables the control device to react quickly. Since the detection means according to this embodiment are arranged directly on the pressure limiting valve, the detected measurement signals are not or only slightly influenced by interfering signals. According to a particular embodiment, it is possible for the response of the pressure limiting valve to be detected by recording the power consumption of the electric motor.
  • the response of the pressure limiting valve is detected by detecting the motor current.
  • This acquisition method is easy to implement structurally, whereby the motor current is usually already recorded in existing systems.
  • no additional control line is required between the pressure limiting valve, control device and electric motor.
  • no further components or detection means have to be added, which means that the weight of the rescue device does not increase and its structural complexity does not increase.
  • the response of the pressure limiting valve is detected by recording the torque and the speed of the electric motor and the engine power that can be calculated from them.
  • This detection device can also be implemented in a comparatively simple manner, since here, too, existing detection means can be used and no additional control line is required between the pressure limiting valve, control device and electric motor.
  • the response of the pressure limiting valve is detected by detecting the flow in the return line after the pressure limiting valve.
  • Flow meters are standard measuring devices and can easily be integrated into existing systems. Since the flow can be measured directly after the pressure relief valve, the measurement signal is not or only slightly falsified by interfering signals.
  • a time monitoring device in the control device detects the duration of the response of the pressure relief valve and the engine speed is reduced via the control device as soon as a defined duration of this state is reached or exceeded. This ensures that the control device only has a regulating or controlling effect on the motor speed when the rescue tool has reached an end position or is blocked or the available force is no longer sufficient for a working movement. In addition, this characteristic ensures that, for example, a short-term blocking of the rescue tool does not lead to an immediate reduction in the engine speed and thus no work performance available for the rescue operation.
  • An embodiment is also advantageous, according to which it can be provided that the defined duration until the engine speed is reduced is specified in the control device and / or is or can be specified individually by a user. This measure enables increased flexibility and adaptability for the operator.
  • the defined duration is preferably between 0.5 s and 2 s.
  • a too rapid action of the control device on the engine speed is often undesirable in order not to restrict the availability of the rescue tool during rescue operations.
  • a too slow reaction of the control device is also undesirable in order to achieve the desired energy saving as quickly as possible.
  • control device can reduce the engine speed by at least 10%, preferably by up to 50% of the previously applied engine speed.
  • energy savings are achieved, with the rescue device still being available with sufficient power for further work movements or being able to achieve its maximum work performance again as quickly as possible.
  • control device cancels the reduction in the engine speed as soon as the pressure limiting valve no longer responds. This has the advantage that the rescue tool is continuously available with full power for rescue operations.
  • control device never reduces the engine speed below a defined lower limit value, in particular never allows it to fall below 20% of the operating or load speed.
  • This measure is of relevance to safety for the operator, since the engine or hydraulic noise always informs him that the hydraulic unit is running and ready for use. This avoids errors by the operator or even injuries to the operator. As an additional positive effect, this measure improves the response behavior of the hydraulic rescue device.
  • control device cancels the reduction in the engine speed after a defined period, in which defined period the pressure limiting valve no longer responds. This is advantageous in that it is the rescue tool is always available with full power for rescue operations and at the same time prevents short-term conditions in which the pressure relief valve does not respond from being incorrectly recognized and the regulation or control intervening too quickly.
  • the defined duration is specified in the control device and / or is specified individually or can be specified by a user. This measure increases the user friendliness and flexibility.
  • the defined duration is at least 1 s, preferably at least 100 ms, in particular at least 50 ms. Premature cancellation of the speed reduction by the control device is thus advantageously prevented. This is associated with an undesired renewed response of the pressure relief valve. Build-ups with regard to the automatic reduction and increase of the engine speed can thus be kept at bay in a simple manner.
  • control device is integrated into a control system which is also set up to reduce the speed of the motor when the hydraulic rescue tool is not actuated.
  • hydraulic power is saved both when the rescue tool is in an idle or idle state or when it occurs, and when the rescue tool is operated at its performance limit.
  • Fig. 1 shows an embodiment of a portable, battery-operated hydraulic unit 1 in a perspective view.
  • the hydraulic unit 1 is connected to a hydraulic rescue tool 4 via a mechanical-hydraulic interface 2, in the illustrated case via a hydraulic hose connection 3.
  • Two battery packs 5 supply the hydraulic unit 1 with power via an electromechanical interface 6.
  • An operator 7 handles the hydraulic rescue tool 4 while the hydraulic unit 1 is positioned in the vicinity.
  • the hydraulic unit 1 and the rescue tool 4 together form a rescue device 8.
  • a further and possibly independent embodiment of a portable, battery-operated hydraulic unit 1 is shown in plan view.
  • the hydraulic unit 1 is connected directly to a hydraulic rescue tool 4 via a mechanical-hydraulic interface 2.
  • a battery pack 5 supplies the hydraulic unit 1 with power via an electromechanical interface 6.
  • Hydraulic unit 1 and rescue tool 4 form a one-piece rescue device 8.
  • the rescue tools 4 can be formed by scissors-like cutting or spreading tools or by combined cutting and spreading tools. Hydraulic cylinders can also function as rescue tools 4 for people who have had an accident, are locked in or are trapped. The rescue tools 4 or work elements 10 mentioned can also be used by task forces for security operations or to combat crime.
  • FIG. 3 a first, simplified circuit diagram with a hydraulic unit 1, an actuating element 9 and a working element 10 is shown.
  • a hydraulic pump 11 is supplied with power via an electric motor 12, the electric motor 12 being equipped or connected to a control device 13 or, as in FIG Fig. 3 is connected to a control device 13 via a control line 31.
  • the control device 13 can in turn be part of a control system 14.
  • the hydraulic pump 11 conveys a hydraulic fluid 17 in the direction of the working element 10 via a pressure outlet 15 which is connected to a first pressure line 16.
  • the working element 10 can in particular be a hydraulic rescue tool 4.
  • the adjusting element 9, in the illustrated special form of a 4/2-way valve 18, is positioned between the hydraulic pump 11 and the working element 10. This adjusting element 9 can, as shown, be designed structurally outside the hydraulic unit 1, or it can also be positioned inside the hydraulic unit 1.
  • the hydraulic fluid is conducted from the actuating element 9 back into the hydraulic tank 21 via a first return line 19 and a return filter 20.
  • a check valve 47 in a bypass line 48 enables, for example in the event of a blockage of the return filter 20, a brief flow around the return filter 20 in the direction of the hydraulic tank 21.
  • a mechanical pressure limiting valve 22 is connected to the hydraulic pump 11 via the pressure outlet 15, the first pressure line 16 and a second pressure line 23.
  • a piston valve 25 begins to press against the compression spring 24 and thereby displaces a valve body 26.
  • the hydraulic fluid 17 is passed via the second pressure line 23 through the open pressure relief valve 22 and via a second return line 27 returned to the hydraulic tank 21.
  • a sensor-based detection means 28 for detecting the state of the pressure limiting valve 29 in the special form of an optical movement sensor 30 is shown on the pressure limiting valve 22.
  • This optical movement sensor 30 detects the response of the pressure relief valve 22 as a result of the displacement movement of the valve body 26.
  • the signal is transmitted via a control line 31 between the movement sensor 30 and the control device 13.
  • the speed of the electric motor 12 is consequently reduced by means of the control device 13. This state continues as long as the pressure relief valve 22 responds.
  • FIG. 4 a second, simplified circuit diagram is shown, with the same reference numerals or component designations for the same parts as in the previous one Fig. 3 be used. To avoid unnecessary repetition, please refer to the detailed description in the preceding section Fig. 3 pointed out or referred to.
  • a Hall sensor 32 is used as the detection means 28. This Hall sensor 32 detects the displacement movement of the valve body 26 and subsequently the response of the pressure limiting valve 22 as a result of a pressure change. The speed of the electric motor 12 is reduced via a control line 31 between Hall sensor 32 and control device 13. This state continues as long as the pressure relief valve 22 responds.
  • FIG. 5 a third, simplified circuit diagram is shown, with the same reference numerals or component designations for the same parts as in the previous one Fig. 3 be used. In order to avoid unnecessary repetitions, the detailed description in the previous section is also referred to here Fig. 3 pointed out or referred to.
  • an ammeter 33 is used as a detection means 28.
  • the motor current is measured via the ammeter 33, which is arranged on the electric motor 12 or on its power supply lines, and when the pressure relief valve 22 responds, a detectable or characteristic current curve occurs which the control device 13 recognizes. As a result, the speed of the electric motor 12 is reduced by the control device 13. This state continues as long as the pressure relief valve 22 responds.
  • Fig. 6 shows a fourth, simplified circuit diagram, with the same reference numerals or component designations for the same parts as in the previous one Fig. 3 be used. To avoid unnecessary repetition, please refer to the detailed description in the preceding section Fig. 3 pointed out or referred to.
  • the speed and torque of the electric motor 12 are measured using a speed measuring device 34 and a torque measuring device 35.
  • a response of the pressure limiting valve 22 through a characteristic change in output can be detected via the engine output that can be calculated therefrom.
  • the speed of the electric motor 12 is then reduced by the control device 13. This state continues as long as the pressure relief valve 22 responds.
  • FIG. 7 shows a fifth, simplified circuit diagram, the same reference numerals or component designations being used for the same parts as in the previous one Fig. 3 be used.
  • Fig. 7 shows a fifth, simplified circuit diagram, the same reference numerals or component designations being used for the same parts as in the previous one Fig. 3 be used.
  • a detection means 28 for detecting the state of the pressure limiting valve 29 in the particular form of a flow meter 36 is formed.
  • This flow meter 36 detects the response of the pressure limiting valve 22 as a result of a flow of hydraulic fluid 17 through this second return line 27.
  • the speed of the electric motor 12 is reduced via a control line 31 between the flow meter 36 and the control device 13. This state continues as long as the pressure relief valve 22 responds.
  • Fig. 8 shows a simplified and exemplary speed / pressure time diagram of a possible control scenario.
  • the time axis 38 is shown on the abscissa.
  • the ordinate serves both as pressure axis 39 and speed axis 40.
  • pressure curve 41 and speed curve 42 increase.
  • the pressure curve 41 and speed curve 42 increase to a defined nominal speed when switched on, so that the required power is available to the operator as quickly as possible at the start of the work process with the hydraulic rescue tool 4.
  • this approach ramp which is advantageous in practice, is dispensed with.
  • the pressure limiting valve 22 opens. As a result of this opening, there is no further increase in the pressure curve 41.
  • the control device 13 intervenes and reduces the speed to a defined reduction speed 45. If the pressure curve 41 decreases again, for example as a result of a working movement of the rescue tool 4, or if the pressure limiting valve 22 no longer responds, the speed reduction is canceled again by the control device 13 after a further defined duration 46. If the rescue tool 4 continues to perform work and thus reduces pressure, the pressure curve 41 can remain constant as the speed curve 42 increases.
  • All information on value ranges in the objective description are to be understood in such a way that they include any and all sub-areas, e.g. the information 1 to 10 to be understood to mean that all sub-areas, starting from the lower limit 1 and the upper limit 10, are included, ie all sub-areas begin with a lower limit of 1 or greater and end at an upper limit of 10 or less, e.g. 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Computer Hardware Design (AREA)
  • Fluid-Pressure Circuits (AREA)
EP20194093.9A 2019-09-06 2020-09-02 Appareil hydraulique portable fonctionnant sur accumulateur pour outils de sauvetage hydraulique Active EP3789612B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ATA50784/2019A AT522933B1 (de) 2019-09-06 2019-09-06 Tragbares, akkubetriebenes Hydraulikaggregat für hydraulische Rettungswerkzeuge

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EP3789612A1 true EP3789612A1 (fr) 2021-03-10
EP3789612B1 EP3789612B1 (fr) 2023-04-19

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0156939A1 (fr) * 1982-10-26 1985-10-09 Mora Hydraulics AB Outil dirigé par pression
EP0718496A2 (fr) 1994-12-19 1996-06-26 Martin Marietta Corporation Système électrohydraulique à assistance variable
EP0952349A2 (fr) * 1998-04-17 1999-10-27 Nissan Motor Co., Ltd. Régulation de pompe électrique pour une transmission à variation continue
DE19818139A1 (de) * 1998-04-23 1999-11-04 Trw Fahrwerksyst Gmbh & Co Verfahren zur Begrenzung des hydraulischen Maximaldrucks eines Servolenksystems
EP1337016A2 (fr) * 2002-02-19 2003-08-20 Fci Outil hydraulique alimenté par batterie
DE202007013935U1 (de) * 2007-09-28 2008-01-17 ESV Werkzeuge und Zubehör für die elektrische Stromverteilung GmbH Mobile Hydraulikpumpe für hydraulisch zu betreibende Werkzeuge
EP1598555B1 (fr) 2004-05-21 2008-02-20 Koyo-Hpi Système de groupe électro-pompe pourvu de moyens de limitation de la pression du fluide hydraulique fourni par la pompe
EP2610528A2 (fr) 2011-12-28 2013-07-03 Jtekt Corporation Unité de pompe électrique
DE102015207033A1 (de) * 2015-04-17 2016-10-20 Werkzeuge Für Die Elektrische Stromverteilung Ug (Haftungsbeschränkt) Tragbare mobile Hydraulikpumpe für hydraulisch zu betreibende Werkzeuge
DE102015214006A1 (de) 2015-07-24 2017-01-26 Continental Reifen Deutschland Gmbh Verfahren zur Druckmessung

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EP0156939A1 (fr) * 1982-10-26 1985-10-09 Mora Hydraulics AB Outil dirigé par pression
EP0718496A2 (fr) 1994-12-19 1996-06-26 Martin Marietta Corporation Système électrohydraulique à assistance variable
EP0952349A2 (fr) * 1998-04-17 1999-10-27 Nissan Motor Co., Ltd. Régulation de pompe électrique pour une transmission à variation continue
DE19818139A1 (de) * 1998-04-23 1999-11-04 Trw Fahrwerksyst Gmbh & Co Verfahren zur Begrenzung des hydraulischen Maximaldrucks eines Servolenksystems
EP1337016A2 (fr) * 2002-02-19 2003-08-20 Fci Outil hydraulique alimenté par batterie
EP1598555B1 (fr) 2004-05-21 2008-02-20 Koyo-Hpi Système de groupe électro-pompe pourvu de moyens de limitation de la pression du fluide hydraulique fourni par la pompe
DE202007013935U1 (de) * 2007-09-28 2008-01-17 ESV Werkzeuge und Zubehör für die elektrische Stromverteilung GmbH Mobile Hydraulikpumpe für hydraulisch zu betreibende Werkzeuge
EP2610528A2 (fr) 2011-12-28 2013-07-03 Jtekt Corporation Unité de pompe électrique
DE102015207033A1 (de) * 2015-04-17 2016-10-20 Werkzeuge Für Die Elektrische Stromverteilung Ug (Haftungsbeschränkt) Tragbare mobile Hydraulikpumpe für hydraulisch zu betreibende Werkzeuge
DE102015214006A1 (de) 2015-07-24 2017-01-26 Continental Reifen Deutschland Gmbh Verfahren zur Druckmessung

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AT522933B1 (de) 2021-04-15
AT522933A1 (de) 2021-03-15

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