EP3261804B1 - Procédé d'employer un outil hydraulique et outil hydraulique - Google Patents

Procédé d'employer un outil hydraulique et outil hydraulique Download PDF

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Publication number
EP3261804B1
EP3261804B1 EP16703952.8A EP16703952A EP3261804B1 EP 3261804 B1 EP3261804 B1 EP 3261804B1 EP 16703952 A EP16703952 A EP 16703952A EP 3261804 B1 EP3261804 B1 EP 3261804B1
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EP
European Patent Office
Prior art keywords
pressure
return valve
hydraulic
piston
valve
Prior art date
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Active
Application number
EP16703952.8A
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German (de)
English (en)
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EP3261804A1 (fr
Inventor
Egbert Frenken
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.)
Gustav Klauke GmbH
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Gustav Klauke GmbH
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Publication date
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Publication of EP3261804A1 publication Critical patent/EP3261804A1/fr
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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B25B27/10—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same inserting fittings into hoses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/34—Perforating tools; Die holders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B25B27/026—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same fluid driven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/32—Hand-held perforating or punching apparatus, e.g. awls
    • B26F1/34—Hand-held perforating or punching apparatus, e.g. awls power actuated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/44—Cutters therefor; Dies therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/10—Riveting machines
    • B21J15/105—Portable riveters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/10—Riveting machines
    • B21J15/16—Drives for riveting machines; Transmission means therefor
    • B21J15/20—Drives for riveting machines; Transmission means therefor operated by hydraulic or liquid pressure

Definitions

  • the invention initially relates to a method according to the features of the preamble of claim 1.
  • the invention relates to a hydraulically operated hand-held device according to the features of the preamble of claim 9.
  • Such methods and hand-held devices are, for example, from DE 10 2008 028 957 A1 , EP 0 944 937 B1 ( U.S. 6,276,186 B1 , U.S. 6,401,515 B2 ) and WO 2014/108361 A1 known.
  • Such hand-held devices are used, for example, as pressing devices, preferably for pressing or crimping cable lugs with an inserted cable or for pressing tubular or hose-shaped workpieces.
  • Such hand-held devices can also be used for perforating or punching metal components in particular.
  • such hand-held devices can also be designed as riveting devices or other cutting devices.
  • a hydraulically operated hand-held device in the form of a pressing device is, for example, in EP 0 944 937 B1 ( U.S. 6,276,186 B1 , U.S. 6,401,515 B2 ) described.
  • This manual device has a return valve, which is shifted into a valve open position when a predetermined hydraulic pressure is reached and is held in this position. This leads to a return flow of the hydraulic medium that shifts the moving part into the working position. Due to the lack of or reduced pressurization, the moving part moves back to the basic or end position. At the latest when this end position is reached, the hydraulic pressure acting on the return valve is lowered in such a way that the return valve closes again automatically.
  • a hydraulic hand-held device which has a pressure sensor which opens a solenoid valve when a limit pressure is reached.
  • the limit pressure is specified by a memory chip to be used.
  • the invention is concerned with the task of specifying a method for operating a hydraulically operated hand-held device or a hydraulically operated hand-held device which, with a simple structure of the device, enables or facilitates the processing of workpieces that are particularly different in terms of size and/or material .handling simplified.
  • claim 9 is based on the fact that the hydraulic pressure acting on the return valve can be increased to a pressure value that causes the return valve to open, regardless of whether the predetermined working pressure is reached, the pressure increase being initial-type and having a piston the return valve is moved out of a valve seat to release a return opening for the hydraulic medium, wherein the returning hydraulic medium can also act on a total piston area of the return valve that is larger than a partial piston area and can thus hold the return valve in the open position even with reduced pressure or decreasing pressure.
  • the predetermined working pressure is the hydraulic pressure that occurs in the hydraulic medium as a result of a working process and at which the return valve moves into the open position due to its structural design.
  • this hydraulic pressure is established in the hydraulic chamber, which extends from the moving part to a closing surface of the return valve.
  • the structural design is preferably provided in that a partial piston surface of a valve piston is seated in the valve seat in the closed state, ie forms the said closure surface. A specific hydraulic pressure is then required in order to lift the return valve out of the valve seat by acting on this partial piston surface, so that hydraulic medium can flow through the valve seat, for example into a hydraulic medium reservoir.
  • the return valve is further preferably designed as a valve piston in such a way that it has a total piston area on which the hydraulic medium acts when the return valve is lifted out of the valve seat, ie is in the open position. Due to the size ratio between the total piston area and the partial piston area, in the open position of the return valve compared to the partial piston area, a comparatively very low pressure can be sufficient to hold the return valve in its open position.
  • the area that supplements the partial piston area to form the total piston area can also be acted upon by hydraulic means when the return valve is in the closed state. However, not by the hydraulic medium contained in the hydraulic space ending at the said closure surface.
  • a pressure of 300 to 600 bar, further for example 400 or 500 bar may be required, for example with respect to the partial piston area, in order to remove the return valve from the Lift valve area, while the total piston area only requires a pressure of a few, for example 5, 4 or less bar, about up to 0.5 bar, for example, to remain in the open position.
  • this pressure acting on the entire piston area can be generated, for example, by a restoring spring acting on the moving part.
  • the specified working pressure is generally selected to be higher than the pressure required to carry out the perforating or punching process.
  • the specified working pressure can also be set so high that the return valve only works in the sense of a pressure relief valve without further measures.
  • the design of the hand-held device in particular in the variants given by way of example, can be provided such that when the return valve is triggered due to the specified working pressure, the moving part moves back to its specified starting position, provided no further intervention takes place.
  • a hydraulic pressure at which the return valve is moved into the open position can be achieved in that a pressure increase in the hydraulic medium acting on the return valve is carried out with a means of action that is independent of a work process that is carried out with the hand-held device .
  • This pressure increase is carried out in the hydraulic medium, which acts on the area of the return valve, which, when the return valve is open, supplements the partial piston area to form the total piston area.
  • This hydraulic medium is separated in terms of flow from the hydraulic medium acting on the moving part.
  • the pressure can optionally be given for a short time. The pressure increase is selected so that the return valve is shifted to the open position.
  • the pressure prevailing with regard to the moving part for carrying out the work process in the hydraulic medium acting on the moving part has regularly not yet reached the predetermined working pressure. It is thus given that the return valve can be opened hydraulically before the working pressure corresponding to the triggering pressure at the return valve is applied to the moving part.
  • the return valve can be moved hydraulically into the open position independently of the prevailing working pressure on the moving part.
  • the return valve preferably only closes after a specific hydraulic pressure acting on the return valve has dropped so far that the pressure load required due to the structural design of the return valve to hold the return valve in the open position is no longer present.
  • the return valve can be opened automatically at a changeable, i.e. preselected working pressure that is different from the specified working pressure, preferably as a result of corresponding pressurization of the return valve.
  • the user can specify a working pressure as a modified working pressure using a setting wheel or buttons on the device, which is lower than the maximum permissible working pressure, i.e. the above-mentioned specified working pressure, at which the return valve preferably also opens automatically, or also corresponds to this maximum working pressure.
  • the latter can be useful, for example, if the stated maximum working pressure is actually, but only, to be achieved with greater accuracy.
  • working pressures of 50 to 600 bar can be adjusted steplessly or step by step. It is thus possible to adapt the load to the machining of workpieces to be carried out by means of the device, while maintaining an automatic return of the moving part to the end position after the possibly set working pressure has been reached.
  • the modified working pressure can be set from outside the hand-held device, for example via a radio interface or optical interface.
  • the increase in pressure preferably acts only briefly. In terms of time, the pressure increase can only be effective in the range of a few tenths of a second, for example over a period of 1/10 to 5/10 of a second.
  • the pressure increase is carried out in particular by feeding hydraulic medium into the space provided with regard to an outflow direction of the hydraulic medium after the valve seat.
  • This space which is also referred to below as the valve space, is in front of an opening of the return valve on the one hand by the total piston area minus the partial piston area and on the other hand by the surface of the valve seat facing the total piston area including a delimiting surface of the pressure-increasing piston and possibly a surface of a given in this context Line section given.
  • the latter in any case insofar as the pressure-increasing piston is arranged directly as part of the valve chamber. It can also be separated from this, for example, by a non-return valve.
  • an initial pressure increase to move the return valve into the open position acts on the one hand on the total piston area of the return valve (minus the partial piston area of a valve tip that is not yet effective at the moment of the pressure increase). It also acts essentially decoupled from the moving part because at the moment of the pressure increase it is still - only - exposed to the hydraulic pressure "before" the valve seat (considered with regard to the direction of flow of the hydraulic medium through the open return valve). As a result, only a significantly lower pressure increase is required than in front of the valve seat (considered with regard to the direction of flow of the hydraulic medium through the open return valve).
  • the initial pressure increase moves a piston of the return valve out of the valve seat, after which, as is known from the prior art, a return opening for the hydraulic medium is released and the returning hydraulic medium acts on the piston surface of the return valve, which is larger than the valve seat surface, i.e. the partial piston surface, and so on keeps the return valve in the open position even with reduced pressure or decreasing pressure.
  • the pressure increase can be performed by a process of a pressure-increasing piston.
  • This is preferably a movable pressure-increasing piston which acts on the hydraulic medium.
  • the pressure-increasing piston In order to achieve an initial pressure increase, the pressure-increasing piston must be moved abruptly. This can be done manually by the user, for example using a correspondingly provided lever arrangement. In this respect, an electromechanical displacement of the pressure-increasing piston is preferred.
  • the pressure-increasing piston can be moved in a hydraulic medium cylinder which is hydraulically constantly connected to a return line of the hydraulic medium.
  • the hydraulic medium flowing back after the opening of the return valve thus preferably acts on the pressure-increasing piston in the opposite direction to the displacement direction of the pressure-increasing piston when the pressure increases.
  • the returning hydraulic medium can support or bring about a return displacement of the pressure-increasing piston into a basic position. However, this is preferred only when a force has been applied to the pressure-increasing piston. In the case of an electromechanical displacement by an electromagnet, this is the case, for example, when the magnetic force has dropped. With the usual setting, the magnetic force falls and preferably only falls when the return valve is again in its closed position.
  • a negative pressure can also be generated by moving the pressure-increasing piston backwards, in order to support or actively trigger a closing process of the return valve.
  • the said drop in the magnetic force can already be sufficient for such a support or active triggering of a closing process of the return valve.
  • the fact that a restoring spring acting on the pressure-increasing piston is provided can also contribute to this. If necessary, a further displacement of the pressure-increasing piston from a basic position against the direction of the pressure increase can also be carried out beyond the initial position in order to generate an additional negative pressure and trigger or support the closing process of the return valve.
  • the pressure-increasing piston can be moved via a drive that is separate from a drive of the hydraulic pump.
  • Both drives can be electromechanical drives. Both drives are preferably operated via a common power supply.
  • the pressure-increasing piston can be moved linearly via an actuating magnet.
  • a spindle drive can also be provided for the linear displacement of the pressure-increasing piston.
  • valve chamber is connected to the hydraulic medium reservoir via a separate non-return valve stands.
  • This check valve opens when the pressure in the valve chamber drops.
  • this check valve opens when the return valve closes or is closed, in order to enable the pressure-increasing piston to move back to its starting position comparatively quickly. If the return valve is open and the pressure of the returning hydraulic medium is present, this check valve is thereby closed.
  • the hydraulic fluid drains into the hydraulic fluid reservoir via a drain opening released by the return valve.
  • a setting device for different working pressures that can be preset by the user can be provided on the hand-held device, designed as an adjusting wheel, adjusting slide, an arrangement of a plurality of keys, with each key being assigned a predetermined working pressure, or as a keyboard with an associated display, with the The actually selected working pressure is shown on the display.
  • the adjustability of the hydraulic or working pressure, with which the moving part acts on a workpiece or the like enables an adjustment, for example to the workpiece conditions, which can be brought about in the simplest way by the user.
  • softer, correspondingly more easily deformable materials can be subjected to a lower working or hydraulic pressure than, in contrast, harder materials.
  • Workpieces with different parameters can thus be machined with just one handheld device.
  • a working pressure can be selected that deviates from the pressure in the hydraulic medium at which the return valve would be brought into its open position anyway due to its structural design.
  • This pressure, at which the return valve is brought into the open position due to its structural design is referred to as the specified working pressure.
  • the selected, set working pressure can also, as already explained above, be chosen to match the specified working pressure. Regardless of the selected working pressure, the specified working pressure remains unchanged. It only plays no role as long as a selected working pressure is provided below the predetermined working pressure or in accordance with this.
  • the setting of the selectable working pressure can optionally also be carried out via a non-mechanical interface, in particular a radio and/or optical interface to the device.
  • the return movement of the moving part can also only take place by removing the loading if a first contact with the workpiece has been detected beforehand by the device.
  • the return movement of the moving part can also be made for the return movement of the moving part to be terminated by repeated actuation.
  • This can be achieved in particular by the electrical voltage on the actuating magnet, which acts on the pressure-increasing piston, dropping when it is actuated again.
  • the opening and/or closing of the return valve is carried out as described above.
  • the closing of the return valve can be brought about by the return displacement of the pressure-increasing piston that then occurs.
  • the return can be achieved in that the return valve, which also opens when a predetermined working pressure is reached, is shifted into an open position with one of the measures already described above, which leads to a return of the hydraulic medium acting on the moving part.
  • the opening of the return valve can also take place mechanically, for example electromechanically, for example depending on the detection of a cancellation of the actuation of the switch.
  • the return valve is acted upon directly, for example via a linkage, when the return valve is designed as a valve piston, for example via a relevant piston rod.
  • the actuation of the switch can be detected by sensors.
  • the motor current of a drive that drives the hydraulic pump can also be monitored. This is particularly the case when the operation of the hydraulic pump is directly dependent on the actuation of the switch. A cessation of the relevant motor current is evaluated as a cancellation of the switch loading.
  • a signal to open the return valve can be generated.
  • the return valve can be opened by increasing the hydraulic pressure acting on the return valve.
  • a corresponding contact or proximity sensor can be provided.
  • the motor current of the pump drive can also be monitored for this purpose.
  • the signal of a pressure sensor that detects the pressure in the hydraulic medium can be evaluated for this purpose.
  • a detected significant increase can be evaluated as a workpiece contact.
  • the significant increase is characterized in particular by the fact that a previously given approximately linear increase in pressure is left when the moving part is advanced.
  • Workpiece contact can be assumed, for example, if, based on a unit of time, the motor current or the pressure mentioned is 2 or more percent above a linear increase extrapolated from a previous unit of time.
  • Such an increase of up to 10 or more, say up to 20 percent can also be counted as contact with a workpiece. This applies both to an actually measured pressure and to the specified motor current of the pump drive, since the pump has to run with a correspondingly increased force when the resistance against the moving part increases, as is the case when the workpiece comes into contact.
  • the pressure sensor is particularly preferably an electrical or electronic pressure sensor, more particularly a pressure sensor that constantly carries out a pressure measurement at specific time intervals when the device is switched on.
  • the time intervals can be in the range of a few seconds up to a few tenths of a second.
  • the time intervals are preferably in the range of one or a few milliseconds, for example in the range between 1 and 200 ms.
  • the return valve can also be shifted into the open position, for example via a piston rod directly connected to a valve piston, as indicated, or a similar linkage, on which piston rod or linkage a servomotor acts, in order to trigger the return movement of the moving part.
  • a complete return of the moving part is first awaited before the next actuation is released.
  • a predetermined fixed period of time of 5 or 10 seconds can be specified.
  • the pressure sensor can also be used to determine whether the return (complete) has taken place.
  • a possible (additional) hydraulic pressurization of the return valve to trigger a movement of the moving part back into the end position enables energy-efficient work. Since the device as a whole does not necessarily have to work until the release pressure of the return valve is reached, but the return can be initiated specifically when the intended processing has been carried out, significantly more processing can be carried out with an accumulator-operated hand-held device with a charged accumulator than with solutions in which the fixed release pressure must always be achieved for each work process.
  • the switch-off cannot always take place at the desired pressure. If, for example, a pressure of 230 bar is desired, a pressure of, for example, 300 bar can still develop with the appropriate inertia. Switching off at a certain pressure, such as the 230 bar mentioned, is particularly important in connection with punch riveting, since the rivets can otherwise be over-pressed depending on the material. Due to the short-term pressure increase acting on the return valve, there is a rapid pressure drop given on the moving part due to opening of the return valve. The reaction, ie the opening of the return valve, takes place in a time range of one or a few tenths of a second, in any case up to one second. It can also be a time range of a few milliseconds, for example two, four or ten milliseconds.
  • a hydraulically operated hand-held device 1 in the form of a pressing device with an electric motor 2, a hydraulic pump (not shown in detail), a hydraulic medium reservoir 3 and a moving part 4 designed as a hydraulic piston.
  • the moving part 4 can be moved relative to a fixed part 5 formed by the device housing or, for example, the cylinder in which the hydraulic piston moves.
  • the moving part 4 is now, for example, the in figure 1 shown tool holder. It can also be the hydraulic piston, for example (see e.g figure 2 ).
  • the components of the hydraulic fluid reservoir 3, the return valve 8, the adjustment device 27 and possibly others as well are accommodated in a device body K, which is not shown here in further detail.
  • the hydraulic chamber 6 includes the space into which hydraulic medium is pumped. This begins on the pressure side of the hydraulic pump. As for example in figure 2 shown, the hydraulic chamber 6 has a return line 7 via which the hydraulic medium can flow back into the hydraulic medium reservoir 3 via a return valve 8 .
  • the hydraulic chamber 6 changes with the working state of the hand-held device 1.
  • the moving part 4 in a opposite figure 2 changed position.
  • the return valve 8 figure 5
  • the space upstream of the hydraulic piston is included in the hydraulic space 6, but at the same time the passage through the valve seat and the space directly in front of the return valve 8 when the return valve is open.
  • the electric motor 2 for operating the hydraulic pump and thus for moving the moving part 4 in the direction of the working position is activated via a switch 9, which is preferably designed as a manually operable button.
  • the electrical supply of the electric motor 2, as well as preferably also switching/control electronics, takes place via an accumulator, not shown, on the device or via an electrical line.
  • the return valve 8 is pressed into the valve seat by means of a pressure spring 10 .
  • the valve seat preferably consists of a screw-in part 12 which is screwed into the housing of the hand-held device 1 via a thread 11 .
  • a through-flow bore 13 is provided in the valve seat, optionally in the screw-in part 12 . In terms of flow, this is connected to the return line 7.
  • the return valve 8 only opens when a certain triggering pressure is exceeded. This is the specified working pressure mentioned at the beginning. This triggering pressure can be 600 or 700 bar, for example.
  • the pressure of the hydraulic medium is no longer only present on the area corresponding to the cross-sectional area of the flow bore 13, a partial piston area, for example given by a valve needle 14, but on the entire area facing the hydraulic chamber (bottom area 17 ) of the return valve piston 15 of the return valve 8 having the valve needle 14.
  • the open return valve 8 is therefore already held in the open position by a very low pressure in the return line 7, for example a pressure of 2 to 5 bar.
  • the valve needle 14 does not have to be formed so that it tapers to an ideal point. In any case, it is preferably formed in the shape of a cone.
  • This pressure is generated when the moving part 4 moves back, preferably by a spring 16 acting on the moving part 4 and loading the moving part 4 into the end position.
  • the pressure is again significantly lower.
  • the pressure especially at the beginning of the return movement of the moving part, is only 3/4 or less of the pressure in front of the flow bore 13 or the valve seat, in practice, for example, about half.
  • this pressure difference then essentially balances out and is usually only comparatively small soon after the beginning of the return movement of the moving part.
  • the space 26 adjoining the flow bore 13 is included in the hydraulic space up to the lower surface 17 of the return valve piston 15 .
  • the hydraulic medium then flows into the reservoir 3 via a discharge opening 18.
  • the space 26 is also referred to above and below as the valve space.
  • An axial bore 19 which penetrates the lower surface 17 and is preferably non-return-proof enables the return valve 8 in the closed state according to FIG figures 2 and 3 a subsequent flow of hydraulic medium from the hydraulic medium reservoir into the valve chamber 26, in particular to facilitate a return movement of the pressure-increasing piston 22 (see also further below).
  • valve needle 14 comes out of the valve seat lifting hydraulic or release pressure the specified working pressure at the moving part 4.
  • a further line 20 filled with hydraulic fluid is preferably provided in association with the hydraulic chamber adjoining the flow bore 13 in the outflow direction.
  • This line 20 continues in a hydraulic fluid cylinder 21, in which the aforementioned pressure-increasing piston 22 is preferably linearly displaceable.
  • the line 20 could also be shorter than shown or omitted.
  • a linear movement of the pressure-increasing piston 22 in the hydraulic medium cylinder 21 or in the line 20 can be achieved by means of an electrically controllable actuating magnet 23 .
  • the movement of the pressure-increasing piston 22 brought about when the actuating magnet 23 is activated preferably takes place against the force of a return spring 24 acting on the pressure-increasing piston 22.
  • the line 20 hydraulically forms part of the chamber 26 via bores 25 provided in the screw-in part 12, for example, and preferably aligned in the displacement direction of the return valve 8.
  • the screw-in part 12 is not in direct contact with the facing housing wall, so that hydraulic medium moved by the pressure-increasing piston 22 can easily flow out of the line 20 via the bore 25 can flow into the part of the space 26 which is in the outflow direction of the hydraulic medium after the valve seat.
  • the hand-held device 1 preferably has an adjustment device 27, by means of which the maximum working pressure applied to the moving part 4 can be preset by the user.
  • a plurality of keys 28 are provided for this purpose, for which keys 28 predetermined pressure values are stored.
  • the setting device can be used to adjust the above-described selected working pressure, which is modified (or, in individual cases, also corresponds to this) with respect to the specified working pressure. Reference is also made at this point to the other, possibly alternative, options for the radio connection etc. mentioned at the outset.
  • a working pressure of 200 bar or 300 bar that triggers the return valve can be preselected.
  • evaluation/control electronics evaluate measured pressure values from a pressure sensor 29 and compare them with the desired pressure value specified via a button 28 .
  • the pressure-increasing piston 22 moves abruptly into the advance position according to the representations in FIGS figures 5 and 6 .
  • the pressure-increasing piston 22 moves into a close, practically circumferentially sealed interaction with the Hydraulic fluid cylinder 21 of the line 20. Hydraulic fluid located in front of the pressure-increasing piston 22 is displaced in a direction of travel of the pressure-increasing piston 22 in the direction of the return valve 8, and thus in the illustrated embodiment into the space "after" the flow bore 13.
  • valve needle 14 is then lifted from the valve seat so that the hydraulic fluid can flow back from the hydraulic chamber 6 back into the hydraulic fluid reservoir 3, with the return valve 8 being held in the raised position until the moving part 4 reaches the end position according to figure 2 reached and thus the opening holding pressure for the return valve 8 is fallen below.
  • the pressure increase at the return valve 8 by the pressure-increasing piston 22 has an initial effect. With the lifting of the return valve 8 and the associated connection of the space 26 with the drain opening 18 with simultaneous opening of the flow bore 13, the pressure prevailing due to the return movement of the moving part 4 acts on the return valve 8.
  • the electrical loading of the actuating magnet 23 can also initially take place in a pulsed manner, so that after the pressure-increasing piston 22 has been fully advanced, it is almost suddenly in the advanced position according to FIG figure 6 located. If a working cycle runs regularly, i.e. if in particular no premature termination of the return movement of the moving part is desired, the pressure-increasing piston 22 preferably remains in this position as long as the actuating magnet 23 is also acted upon.
  • the pressure-increasing piston 22 can correspondingly move back prematurely into its initial position as a result of an almost premature cancellation of the action on the actuating magnet 23, which took place before the moving part has moved back completely.
  • the enlargement of the valve space 26 associated with this can ensure such a pressure drop that a desired closure of the return valve 8 is thereby achieved.
  • a flow path from the hydraulic medium reservoir 3 into the valve chamber 26 preferably opens at the same time, in order to supply the valve chamber 26 with the required hydraulic medium, which enables the pressure-increasing piston 22 to move back.
  • This flow path can be provided by a check valve arranged in the valve piston and/or a connecting path from the hydraulic medium reservoir 3 to the line 20 .
  • a return movement of the pressure-increasing piston 22 can also simultaneously open up a (further) discharge path for hydraulic fluid into the hydraulic fluid reservoir 3, initially via a line section 31 which is released by the pressure-increasing piston 22 moving back.
  • hydraulic fluid can (also) run directly into the hydraulic fluid reservoir 3.
  • the forward movement of the moving part 4 into the working position is preferably maintained only as long as the user actuates the switch 9.
  • a signal is generated when the switch 9 is released (even before a work process is completed), which leads to an activation of the actuating magnet 23 and thus to an increase in pressure in the chamber 26 via the pressure-increasing piston 22 . Accordingly, when the switch 9 is released, the return valve 8 is shifted into the open position, which leads to an automatic return of the moving part 4 into the end position.
  • the pressure-increasing piston 22 can be arranged transversely to the return valve 8.
  • the longitudinal axes of the pressure-increasing piston 22 and the return valve 8 intersect outside of the respective extension areas. This supports a desired compact design.
  • actuating magnet 23 or the relevant structural section is surrounded by hydraulic medium by protruding into the hydraulic medium reservoir 3 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Press Drives And Press Lines (AREA)
  • Fluid-Driven Valves (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Safety Valves (AREA)

Claims (15)

  1. Procédé pour faire fonctionner un appareil manuel (1) à fonctionnement hydraulique, par exemple un appareil de pressage et/ou un appareil de poinçonnage ou de découpage, dans lequel l'appareil manuel (1) présente une pompe hydraulique, une partie mobile (4), une partie fixe (5) et une soupape de retour (8) avec un siège de soupape associé, dans lequel en outre la partie mobile (4) est déplacée dans une position de travail par l'établissement d'une pression hydraulique qui résulte du remplissage d'une chambre hydraulique (6) avec un fluide hydraulique provenant d'une chambre formant réservoir (3) en utilisant la pompe hydraulique et la partie mobile (4) est ramenée automatiquement de la position de travail dans une position finale par une ouverture de la soupape de retour (8) lorsqu'une pression de travail prédéfinie est atteinte, caractérisé en ce que la pression hydraulique agissant sur la soupape de retour (8) est augmentée pour déclencher un mouvement de la partie mobile (4) dans la position finale indépendamment du fait que la pression de travail prédéfinie soit atteinte, dans lequel une augmentation de la pression de type initial déplace un piston de la soupape de retour hors d'un siège de soupape, après quoi une ouverture de retour est libérée pour le fluide hydraulique et le fluide hydraulique en retour agit sur une surface de piston totale de la soupape de retour qui est agrandie par rapport à une surface de piston partielle et maintient ainsi la soupape de retour dans la position ouverte même avec une pression réduite ou une pression décroissante.
  2. Procédé selon la revendication 1, caractérisé en ce que la surface qui complète la surface de piston partielle en la surface de piston totale, peut également être sollicitée par du fluide hydraulique lorsque la soupape de retour est en position fermée, dans lequel, de préférence, l'augmentation de pression est réalisée dans le fluide hydraulique qui agit sur la surface.
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce que la soupape de retour (8) s'ouvre automatiquement à une pression de travail modifiée par rapport à la pression de travail prédéfinie, dans lequel, de préférence, la pression de travail modifiée est réglable.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'augmentation de la pression hydraulique est réalisée par injection de fluide hydraulique dans une chambre (26) ménagée en aval du siège de soupape par rapport à un sens d'écoulement du fluide hydraulique.
  5. Procédé selon la revendication 4, caractérisé en ce que l'augmentation de pression est réalisée par un rapetissement de la chambre (26) ménagée en aval du siège de soupape, dans lequel, de préférence, la chambre (26) ménagée en aval du siège de soupape est donnée, avant une ouverture de la soupape de retour, d'une part par la surface de piston totale moins la surface de piston partielle et d'autre part par la surface du siège de soupape tournée vers la surface de piston totale moins la surface de piston partielle, y compris une surface de délimitation du piston d'augmentation de pression et le cas échéant une surface d'une portion de conduite donnée dans ce contexte.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'augmentation de la pression hydraulique est réalisée par un déplacement d'un piston d'augmentation de pression (22), dans lequel, de préférence, le piston d'augmentation de pression (22) est déplacé dans un cylindre à fluide hydraulique (21).
  7. Procédé selon la revendication 6, caractérisé en ce que le cylindre à fluide hydraulique (21) est en liaison permanente avec une conduite de retour (7) du fluide hydraulique et/ou le cylindre à fluide hydraulique (21) n'est en liaison hydraulique avec la conduite de retour (7) du fluide hydraulique que lorsque la soupape de retour est ouverte.
  8. Procédé selon l'une des revendications 6 ou 7, caractérisé en ce que le piston d'augmentation de pression (22) est déplacé par un entraînement distinct d'un entraînement de la pompe hydraulique et/ou en ce que le piston d'augmentation de pression (22) est déplacé par un aimant de réglage (23).
  9. Appareil manuel à fonctionnement hydraulique, par ex. appareil de pressage ou appareil de poinçonnage ou de découpage, dans lequel l'appareil manuel (1) présente une pompe hydraulique, une partie mobile (4), une partie fixe (5) et une soupape de retour (8) avec un siège de soupape associé, dans lequel, en outre, la partie mobile (4) est déplaçable dans une position de travail par l'établissement d'une pression hydraulique qui résulte du remplissage d'une chambre hydraulique (6) avec du fluide hydraulique provenant d'une chambre formant réservoir (3) en utilisant la pompe hydraulique, dans lequel il est possible d'obtenir que la partie mobile (4) soit automatiquement ramenée de la position de travail dans une position finale par une ouverture de la soupape de retour (8) lorsqu'une pression de travail prédéfinie est atteinte, caractérisé en ce que la pression hydraulique agissant sur la soupape de retour (8) peut être augmentée à une valeur de pression qui provoque une ouverture de la soupape de retour (8) indépendamment du fait que la pression de travail prédéfinie soit atteinte, dans lequel l'augmentation de pression est de type initial et déplace un piston de la soupape de retour hors d'un siège de soupape pour libérer une ouverture de retour pour le fluide hydraulique, dans lequel, en outre, le fluide hydraulique de retour peut agir sur une surface de piston totale de la soupape de retour qui est agrandie par rapport à une surface de piston partielle et peut ainsi maintenir la soupape de retour en position ouverte même avec une pression réduite ou une pression décroissante.
  10. Appareil manuel selon la revendication 9, caractérisé en ce qu'un piston d'augmentation de pression (22) mobile est prévu pour augmenter la pression.
  11. Appareil manuel selon la revendication 10, caractérisé en ce que le piston d'augmentation de pression (22) est mobile dans un cylindre à fluide hydraulique (21), dans lequel, de préférence, le cylindre à fluide hydraulique (21) est en liaison permanente avec une conduite de retour (7) du fluide hydraulique ou est en liaison hydraulique avec la conduite de retour (7) du fluide hydraulique uniquement lorsque la soupape de retour est ouverte.
  12. Appareil manuel selon l'une des revendications 10 ou 11, caractérisé en ce que le piston d'augmentation de pression (22) est déplaçable par un entraînement séparé d'un entraînement de la pompe hydraulique, dans lequel, de préférence, le piston d'augmentation de pression (22) est déplaçable par un aimant de réglage (23).
  13. Appareil manuel selon l'une des revendications 9 à 12, caractérisé en ce qu'un volume hydraulique utilisable pour augmenter la valeur de la pression sur la soupape de retour (8) est en communication avec la chambre formant réservoir (3) par l'intermédiaire d'un clapet anti-retour (30).
  14. Appareil manuel selon l'une des revendications 9 à 13, caractérisé en ce qu'une surface qui complète la surface de piston partielle en la surface de piston totale peut également être sollicitée par du fluide hydraulique lorsque la soupape de retour est fermée et/ou en ce que l'augmentation de pression peut être effectuée dans le fluide hydraulique qui agit sur la surface de la soupape de retour qui complète la surface de piston partielle en la surface de piston totale lorsque la soupape de retour est ouverte.
  15. Appareil manuel selon l'une des revendications 9 à 14, caractérisé en ce que l'augmentation de pression peut être effectuée par un rapetissement de la chambre (26) donnée en aval du siège de soupape, dans lequel, de préférence, la chambre (26) donnée en aval du siège de soupape avant une ouverture de la soupape de retour est donnée d'une part par la surface de piston totale moins la surface de piston partielle et d'autre part par la surface du siège de soupape tournée vers la surface de piston totale moins la surface de piston partielle, y compris une surface de délimitation du piston d'augmentation de pression et le cas échéant une surface d'une portion de conduite donnée dans ce contexte.
EP16703952.8A 2015-02-27 2016-02-05 Procédé d'employer un outil hydraulique et outil hydraulique Active EP3261804B1 (fr)

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DE102015102806.9A DE102015102806A1 (de) 2015-02-27 2015-02-27 Verfahren zum Betreiben eines hydraulisch betriebenen Handgerätes sowie hydraulisch betriebenes Handgerät
PCT/EP2016/052450 WO2016134951A1 (fr) 2015-02-27 2016-02-05 Procédé servant à faire fonctionner un appareil portatif à fonctionnement hydraulique, ainsi qu'appareil portatif à fonctionnement hydraulique

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EP (1) EP3261804B1 (fr)
KR (1) KR102507205B1 (fr)
CN (1) CN107405761B (fr)
AU (1) AU2016223762B2 (fr)
BR (1) BR112017016224A2 (fr)
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DE (1) DE102015102806A1 (fr)
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BR112017016224A2 (pt) 2018-03-27
CA2978061A1 (fr) 2016-09-01
KR20170123659A (ko) 2017-11-08
US10688646B2 (en) 2020-06-23
AU2016223762A1 (en) 2017-09-14
CN107405761B (zh) 2019-08-30
AU2016223762B2 (en) 2020-06-25
US20180236649A1 (en) 2018-08-23
DE102015102806A1 (de) 2016-09-01
WO2016134951A1 (fr) 2016-09-01
KR102507205B1 (ko) 2023-03-06
EP3261804A1 (fr) 2018-01-03
CN107405761A (zh) 2017-11-28
MX2017010905A (es) 2017-11-24

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