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
  • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
  • F15B1/26—Supply reservoir or sump assemblies
• • 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
• • 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
  • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
  • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric

Definitions

• the present invention relates to a method for operating a hydraulic pump arrangement according to the preamble of claim 1 and to a hydraulic pump arrangement according to the preamble of claim 15.
• Hydraulic pump assemblies of the type previously described are used for a variety of applications. They are usually portable and therefore equipped with a self-sufficient power source such as a battery or the like. On the one hand, they serve as part of hydraulically driven rescue tools such as the so-called spreaders or cutting tools, which are used by emergency personnel to rescue trapped or spilled in vehicle wrecks. On the other hand, you will also find application in the tool technology z. B. for crushing scrap parts, etc.
• the switching valves for operating the hydraulically driven tools are located directly on the tool so that the operator can control the tool via the switching valve as needed directly. The necessary for the drive hydraulic pump assemblies are therefore usually associated with the individual tools via flexible hydraulic hoses in connection.
• hydraulic hoses may have different lengths and thus create different pressure conditions.
• rescue tools for different situations of use, which may need to be changed on site if the situation requires it.
• Different rescue tools in turn establish different energy levels z. B. different idle pressures.
• In order to extend the operating times of the tools efforts are made to extend the operating times of the energy source as far as possible. Therefore, in the past, it has been adopted to provide energy-saving modes.
• Such an energy saving mode takes place, for example, by a conversion. Switch from a load state to a no-load state (switching the operating state), as long as the tool no longer has to do any work.
• the object of the present invention is to provide a new method for operating a hydraulic pump arrangement as well as a new hydraulic pump arrangement which ensures increased flexibility of use, operational safety and ease of operation.
• the invention has the advantage that the hydraulic pump arrangement can optionally also be supplied with electrical energy by a generator located on a vehicle, for example an emergency vehicle.
• a generator located on a vehicle, for example an emergency vehicle.
• the connection from power supply to generator via an electrical cable which can have considerable length and can be stored by means of a cable drum. If the operator has to increase his radius of action, for example in order to continue work in another earthquake-spilled building or accident vehicle, it may be necessary, even with considerable cable lengths, that the generator-supporting vehicle in its position must be moved.
• the resulting energy supply gaps can be closed in an advantageous manner by the battery or the battery quickly and without loss of time.
• the hydraulic pump arrangement according to the invention is operated at a power of at least 800 watts, preferably at least 900 watts, particularly preferably of at least 1,000 watts.
• First and second threshold values W1 and W2 are different. In particular, the first threshold value Wl is lower than the second threshold value W2.
• control makes it possible, even when stopping the movement of the tool under load, for example, when the ambulance in a vehicle needs a little more space for the care of the trapped person and the rescue tool (for example, a spreader) are therefore implemented again must change from the load state to the non-load state and make a subsequent switch from the non-load state to the load state in a further movement of the tool under load.
• the rescue tool for example, a spreader
• the engine Ström and the pressure are set, both of which are dependent on the inputs to be performed by the engine of the hydraulic pump assembly, wherein the first control variable Sl (motor current) is assigned a first threshold value Wl, in which a switch from the non-load state takes place in the load state and the control variable S2 is assigned a second threshold value W2 at which switching from the load state to the non-load state occurs.
• the other control variable can be used as an auxiliary variable and vice versa. This allows a more precise switching.
• the second threshold is preferably a variable value that continuously updates during operation of the hydraulic pump assembly, i. is overwritten in a memory, the operation of the hydraulic pump assembly adapts to multiple operating situations.
• control variable S is preferably also assigned a third threshold value W3, with a changeover from the load state to the non-load state as a function of both the second threshold value W2 and the third threshold value W3. This avoids switching too quickly from the load state to the no-load state.
• the third threshold value W3 is preferably a fixed value of the control variable S.
• the motor current is expediently used as the control variable S, ie the power consumption of the motor of the hydraulic pump, which represents a measure of the work to be performed by the motor of the hydraulic pump arrangement.
• the determination of the motor current can be done in different ways. Alternatively, as the control variable S and the pressure or the engine torque can be used.
• these are preferably time-related values, ie values that represent the change in the control variable S over a predetermined time interval.
• the hydraulic pump device detects the motor current by measuring a voltage drop across a resistor, whereupon the value of the motor current can be concluded.
• a current measuring device such as an ammeter or the like may be provided for measuring the current in the motor line.
• the memory is expediently a rewritable memory of the type RAM or EEPROM.
• the speed of the motor is reduced by changing the motor voltage in its speed.
• a voltage is applied to the motor as a voltage pulse, preferably with a constant pulse height, ie intensity, but different pulse width.
• the voltage is thus modulated.
• the current adjusts due to the external load.
• the receptacle is located at the rear of the hydraulic pump assembly, which on the one hand in cramped conditions, a quick change of the power supply can be done by the battery or vice versa.
• the cable located on the power supply does not interfere with the handling of the hydraulic pump arrangement.
• the versatility and manageability is further increased by the fact that in the inserted state at least half the depth of the respective housing, preferably at least two thirds, is located within the rear contour line of the hydraulic pump assembly in the receptacle on the back of the hydraulic pump assembly.
• the plug attachment is not included in the calculation of the depth.
• the operating comfort of a corresponding hydraulic pump arrangement can thereby be further increased by providing a tank window on the housing of the hydraulic pump arrangement and illuminating the interior of the transparent tank. Consequently, the operator can therefore check the tank contents of the hydraulic pump arrangement at any time even during overnight use or use in dark rooms, without having to use additional aids such as flashlights or the like.
• the ease of use of the hydraulic pump assembly is thereby further increased.
• Fig. 1 is a schematic representation of a first embodiment of the present invention
• Fig. 2 is a flowchart of the control of the hydraulic pump assembly according to the embodiment of Fig. 1;
• FIG. 3 shows a diagrammatic illustration of the course of the motor current of the hydraulic pump arrangement according to FIG. 1;
• FIG. 4 shows a further diagrammatic representation of the course of the motor current of the hydraulic pump arrangement according to FIG. 1 with a break in work
• Fig. 5 is a schematic representation of another embodiment of the present invention
• Fig. 6 is a schematic representation of the use of the hydraulic pump assembly according to the invention at different hose lengths
• FIG. 7 shows a schematic representation of the use of the hydraulic pump arrangement according to the invention in various types of hydraulic tools
• FIG. 8 is an illustration of an operator in use (FIG. 8 a), a greatly simplified schematic representation of the supply of a hydraulic pump arrangement for a tool connected via flexible hose lines, via a power supply unit and a generator (FIG. 8 c), a representation of a typical deployment situation (FIG 8b) as well as
• FIG. 9 is a perspective view of the possibility of accommodating a battery or a power supply unit at the back of the hydraulic pump arrangement
• FIG. 10 is a side view of a hydraulic pump arrangement with illuminated tank space
• the reference numeral 1 indicates the hydraulic pump assembly according to the invention in its entirety. It is portable and communicates via preferably flexible hose lines 15 with a replaceable hydraulic tool 18 in connection.
• clutches 14 and 16 can be provided at the outlet of the hydraulic pump arrangement 1 and at the inlet of the hydraulic tool 18.
• the hydraulic pump arrangement 1 comprises a pump 2 and an electric motor 4 driving the pump 2.
• the electric motor 4 is supplied with electrical energy by a battery 19 or a power supply unit.
• the pump 2 has a tank 3 for the hydraulic fluid. From the pump 2, a pressure line and from the tank 3, the tank line from the hydraulic pump assembly 1 leads to the respective clutch 14th
• the reference numeral 10 a control device for sequential control of the hydraulic pump assembly 1 is characterized.
• it comprises a microcontroller 6, a memory 7, a pulse width modulation generator 8, and an analog / digital converter 9.
• the aforementioned components are accommodated on a board.
• the microcontroller 6 is preferably connected to a main switch 5 in connection. With the latter, the circuit from the battery 19 to the microcontroller 6 is closed or interrupted.
• the electric motor 4 may be connected directly to the main switch 5, so that the former is supplied with electrical energy from the battery 19 when turning on the main switch 5.
• the motor current that is, the current consumed by the electric motor 4 during the operation of the hydraulic pump assembly is measured as the control variable S for the load switching (operating state switching).
• the resistor 13 is connected to a signal line 23 with the analog / digital converter 9 Connection. The latter converts the analog signals into digital signals for further signal evaluation.
• the current determination is preferably carried out indirectly via the voltage drop across the resistor 13. This voltage drop is amplified by the subsequent amplifier 21 and goes through the signal line 23 as an input to the analog-to-digital converter 9.
• the digital data is processed by the microcontroller 6 and with the Data in memory 7 (thresholds from the control logic) matched. From this, the corresponding pulse width is output in the generator 8 for the pulse-width modulation and the power transistor 11 (eg, a MOSFET transistor) is switched accordingly.
• the power transistor 11 is turned off, the current flows through the freewheeling diode 12 connected in parallel with the motor 4. As it were, the negative pole of the motor 4 is clocked. However, it is also possible that the positive pole is clocked.
• the above-described embodiment of the present invention has two operating states, namely a load operation and a non-load operation.
• load operation the full electric power (e.g., 24V) is supplied to the electric motor 4, and a reduced electric power (e.g., 2V) under no-load operation.
• Switching takes place by the control unit 10 by means of the pulse width modulation generator 8, which cooperates with the power transistor 11 as described.
• the pulse width modulation generator 8 together with the power transistor 11 preferably form continuous, periodic current signals which differ only in their pulse width depending on the respective load condition.
• the pulse width is greater in terms of a unit of time, the pulse width is smaller in the no-load condition.
• the respective hydraulic tool 18 comprises a hydraulic cylinder 20, which is connected via a switching valve 17 with the hose lines 15.
• the switching valve 17 is preferably a so-called 4/3 way switching valve, with which it is possible, the two directions of movement (forward and back) of the hydraulic cylinder 20 and an idle position (center position of the switching valve 17) set.
• the switching valve 17 is provided for example in the form of a so-called star grip directly on the tool 18.
• the current which is consumed by the electric motor 4 is permanently determined in the manner described above.
• a differential current is determined, ie a current difference over a fixed period of time.
• a first threshold value Wl is deposited.
• the determined value of the current consumption of the electric motor 4 is compared with the first threshold value W1. If the determined value of the power consumption is smaller than the first threshold value Wl, the hydraulic pump arrangement remains in the non-load range. If the determined value of the power consumption becomes greater than the first threshold value Wl, the hydraulic pump arrangement switches into the load range. In the load range of the electric motor 4 with a voltage of z. B. 24 V operated.
• the current is determined and stored as a threshold value W2 in memory 7. This overwrites the last value in memory.
• An individual value, dependent on the actual conditions (temperature, connected hose length, type of rescue device), is thus always stored in the memory 7 after switching to the load range.
• a third threshold W3 is preset in the controller, which represents a fixed value. If the permanently measured, consumed current of the electric motor 4 remains greater than the second threshold value W2 or third threshold value W3, the control remains in load operation. Unless the permanent measured consumed current of the electric motor 4 becomes smaller than the second threshold W2 as well as becomes smaller than the third threshold W3, the controller switches to the non-load operation (2 V).
• the control of the motor drive is plotted against the time axis t plotted against a current curve I.
• the electric motor is first supplied with a voltage of 2 volts. After a certain period of time, the control valve 17 is actuated by the operator, whereupon the hydraulic cylinder 20 of the tool 18 moves forward without any external load.
• the measured current I exceeds the first threshold value Wl, so that the controller 10 switches the operation from 2 V to 24 V.
• the electric motor 4 only needs a substantially constant current (after a certain transient response).
• the current required by the electric motor 4 increases sharply until a relaxation due to the completed deformation or the cutting of an object or component or the like occurs.
• the control valve 17 has been brought into the neutral position (idle)
• the current required by the electric motor 4 drops sharply again.
• the controller switches to the non-load operation (2 V).
• FIG. 4 differs from that according to FIG. 3 in that a work break is set during operation.
• the break as in Fig.4 can z. B. occur when the operator is unsure, briefly lets go of the star grip, and then continue. -Hereby the control valve 17 is brought by the operator in the neutral position (idle position). The power required by the electric motor 4 drops rapidly. If the power consumption has fallen below both the third threshold value W3 and the second threshold value W2, the controller switches from load mode to non-zero status. Once the work cycle is resumed, the operator actuates the control valve 17 again, so that electricity is drawn again from the electric motor 4.
• the non-load state is switched back to the load mode, whereby a new threshold value W2 is determined and stored in the memory 7. Since the work break took place near the vertex of the current curve, a very high threshold value W2 is stored. To avoid immediate switching, the third threshold W3 is provided. Only when the determined motor current has also fallen below the third threshold value W3 does the control switch from the load operation to the non-load state.
• this embodiment of the invention has instead of an electrical resistance, a current measuring device 22, for example in the form of an ammeter.
• This current measuring device measures the current in the motor cable.
• the current measuring device 22 is also connected via a signal line 23 to the analog / digital converter 9 in connection.
• two further connections T and P are provided.
• B is the pressure as a leading variable and the current as an auxiliary variable to ensure a more precise switching through higher signal resolution.
• the detection of the temperature allows the use of an additional decision criterion to evaluate the main size. In FIG. 5, this is indicated by the inputs T (temperature) and P (pressure) at the analog / digital converter 9.
• the hydraulic pump arrangement 1 can be connected to the same tool 18 via the couplings 14 or 16 as well as variable hose lengths 15a or 15b, depending on the purpose of use.
• the existing pressure in the system changes. relationships.
• this change of the pressure conditions does not lead to malfunctions, as according to the invention the control of the operation of the hydraulic pump assembly 1 is provided via the motor current as a control variable S and this variable is directly dependent on the pen assembly 1 to be performed by the engine of the hydraulic pump assembly 1 work.
• the motor current is compared with at least partially variable current thresholds (adaptive control).
• a tool 18a in the form of a cutter has a different idling power consumption than a spreader (tool 1b). These differences are thus included in the control of the hydraulic pump assembly 1 with a.
• control variable S d H. Control quantity are used.
• FIG. 8 a shows an operator, for example a firefighter or a task force of the technical relief organization in action.
• Tool 18, the hydraulic pump assembly 1 and the hose 15 for the hydraulic fluid are portable and are located directly on the insert object.
• FIG. 8b shows a typical accident situation of a vehicle that has strayed from the road, in which passengers are usually trapped and released from the vehicle wreck as quickly as possible by the emergency services Need to become.
• the emergency vehicle 28 can therefore in many cases, as shown in Fig. 8b, are positioned only at a certain distance from the vehicle wreck.
• 8c shows an embodiment of the hydraulic pump arrangement according to the invention, which is connected via a flexible hose line 15 to a tool 18, for example a cutting tool and / or spreading tool.
• the hydraulic pump arrangement 1 is supplied with electrical energy via an electric cable line 27 from a generator 29 located on the rescue vehicle 28. Since the generator 29 generates alternating current, usually z. B.
• a rectifier 36 is provided in the end region of the cable line 27, ie in the region of the hydraulic pump assembly 1, which converts the alternating current (AC) into direct current (DC).
• the arrangement shown in Fig. 8c can therefore be used indefinitely, however, the mobility of the tool 18 is limited due to the fixed maximum length of the cable line.
• the vehicle wreck shown in FIG. 8b can be far away from the generator 29 for supplying the hydraulic pump arrangement 1 with electrical energy, so that the emergency vehicle 28 first has to make detours, for example a motorway exit, to get closer to the accident site.
• an electrical interface in particular an electrical plug-in cut parts 30, is provided. This electrical interface is intended to perform a quick change in terms of power supply.
• the illustration according to FIG. 9 shows further details in this context.
• the cable conduit 27 includes a plug 38 for connection to the generator 29 ( Figure 8c). Furthermore, the cable line 27 is connected to a power supply 25 in connection.
• a detachable Plug connection 37 may be provided between the power supply 25 and the cable line 27 .
• the power supply comprises in the embodiment shown in Fig. 9, a power supply housing 31, within which, for example, the electrical components, such as the rectifier 36 (Fig. 8c) and a (not shown) transformer, are in common.
• a plug-in extension 34 for contacting the electrical plug-in interface 30 (FIG. 8c).
• the rectifier 36 may also be housed in a separate housing, which is connected via a comparatively short length of cable with the housing of the power supply in combination.
• the battery is provided with the reference numeral 24 and comprises both an identical plug extension 33 and a substantially identical housing 32.
• a receiving shaft 26 for the respective housing 31st or 32 provided.
• a further receiving shaft 35 for the respective plug-in extension 33, 34 of the battery 24 and the power supply 25.
• the receiving shaft 26 and the respective housing 31, 32 of the power supply 25 and the battery 24 are matched to one another, that in the inserted state of the power supply 25 or the battery 24, the housing thereof at least half in the receiving shaft 26, preferably at least two-thirds in the receiving shaft 26 disappears, so immersed in this, whereby the ease of use and comfort of the hydraulic pump assembly by the interchangeability of the battery 24th is not affected by the power supply 25.
• the hydraulic pump arrangement 1 is operated at a power of at least 800 watts, preferably at least 900 watts, preferably at least 1000 watts. Particularly preferably, the hydraulic pump arrangement can be operated in a power range from 950 watts to 1050 watts. ben.
• the receiving shaft 26 is provided with a (not shown) locking coupling, which allows to ensure a manually releasable latching holder of the battery 24 and the power supply 25 in the receiving shaft 26.
• Fig. 10 shows a further advantageous embodiment of the present invention, which, regardless of the type of drive of the pump assembly and the supply of electrical energy, offers a very special operating convenience.
• Reference numeral 3 denotes a tank 3, in which hydraulic fluid for operating the tool, not shown in Fig. 10 is located.
• the housing of the hydraulic pump assembly 1 comprises an almost over the entire depth of the tank 3 extending, in particular elongated tank window 39, which allows the user to view the filling state from the outside.
• a lighting 40 z. B. provided in the form of an LED or multiple LED's.
• the operator can always well control the filling state of the tank 3 even under difficult visibility conditions, for example in a night operation or in dark premises, without having to rely on additional aids such as flashlights or the like.
• the tank contents can be dimensioned as such shorter, which in turn allows a reduced weight of the hydraulic pump assembly 1 and thus improved handling can be achieved.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Fluid-Pressure Circuits (AREA)

Priority Applications (4)

Applications Claiming Priority (1)

Publications (1)

Family

ID=45930680

Family Applications (1)

Country Status (4)

Cited By (2)

Families Citing this family (2)

Citations (2)

Family Cites Families (6)

• 2012
  • 2012-03-30 EP EP12712265.3A patent/EP2831426A1/fr not_active Withdrawn
  • 2012-03-30 WO PCT/EP2012/055822 patent/WO2013143606A1/fr not_active Ceased
  • 2012-03-30 CN CN201280072740.5A patent/CN104254693A/zh active Pending
  • 2012-03-30 US US14/389,670 patent/US20150071791A1/en not_active Abandoned

Patent Citations (2)

Also Published As

Similar Documents

Legal Events