EP3478452B1 - Procédé servant à faire fonctionner un appareil portatif à fonctionnement hydraulique, ainsi qu'appareil portatif à fonctionnement hydraulique - Google Patents

Procédé servant à faire fonctionner un appareil portatif à fonctionnement hydraulique, ainsi qu'appareil portatif à fonctionnement hydraulique Download PDF

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Publication number
EP3478452B1
EP3478452B1 EP17730729.5A EP17730729A EP3478452B1 EP 3478452 B1 EP3478452 B1 EP 3478452B1 EP 17730729 A EP17730729 A EP 17730729A EP 3478452 B1 EP3478452 B1 EP 3478452B1
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EP
European Patent Office
Prior art keywords
return valve
pressure
hydraulic
moving part
hydraulic medium
Prior art date
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Application number
EP17730729.5A
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German (de)
English (en)
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EP3478452A1 (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 of EP3478452A1 publication Critical patent/EP3478452A1/fr
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Classifications

    • 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
    • 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
    • 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
    • B26F1/02—Perforating by punching, e.g. with relatively-reciprocating punch and bed
    • B26F1/14—Punching tools; Punching dies
    • 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
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/04—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for forming connections by deformation, e.g. crimping tool
    • H01R43/042—Hand tools for crimping
    • H01R43/0427—Hand tools for crimping fluid actuated hand crimping tools

Definitions

  • the invention initially relates to a method for operating a hydraulically operated hand-held device, for example a pressing device and / or a punching or punching device, the hand-held device having a hydraulic pump, a moving part, a fixed part and a return valve with an associated valve seat, the moving part also by building up a hydraulic pressure, which results from filling a hydraulic space with hydraulic fluid from a storage space using the hydraulic pump, is moved into a working position, it being possible for the moving part to automatically move out of the working position when the predetermined pressure is reached by opening the return valve an end position is moved back.
  • a hydraulically operated hand-held device for example a pressing device and / or a punching or punching device
  • the hand-held device having a hydraulic pump, a moving part, a fixed part and a return valve with an associated valve seat, the moving part also by building up a hydraulic pressure, which results from filling a hydraulic space with hydraulic fluid from a storage space using the hydraulic pump, is moved into a working position, it being possible
  • the invention relates to a hydraulically operated hand-held device, for example a pressing device or punching or punching device, the hand-held device having a hydraulic pump, a moving part, a fixed part and a return valve with an associated valve seat, the moving part also being built up by a hydraulic pressure which is generated by filling of a hydraulic chamber with hydraulic fluid from a reservoir using the hydraulic pump, can be moved into a working position, it being possible for the moving part to be automatically moved back from the working position to an end position when a predetermined working pressure is reached by opening the return valve.
  • Such methods and hand-held devices are, for example, from the DE 10 2008 028 957 A1 , EP 0 944 937 B1 ( US 6 276 186 B1 , US 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 tubular workpieces.
  • Such handheld devices can also be used for punching or punching, in particular of metal components.
  • Such hand tools 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 the EP 0 944 937 B1 ( US 6 276 186 B1 , US 6,401,515 B2 ) described.
  • This hand-held device has a return valve, which is shifted to a valve open position when a predetermined hydraulic pressure is reached and is held in this position. This leads to a backflow of the hydraulic medium which shifts the moving part into the working position. The moving part moves back into the basic or end position due to the missing or reduced pressurization. When this end position is reached at the latest, the hydraulic pressure acting on the return valve is reduced in such a way that the return valve closes again automatically.
  • the invention is concerned with the task of a method for operating a hydraulic to operate operated hand-held device or a hydraulically operated hand-held device which, with a simple construction of the device, enables the processing of different workpieces, in particular with regard to size and / or material, or simplifies handling.
  • the hydraulic pressure acting on the return valve for triggering a movement of the moving part into the end position by means of a separately triggerable pressure increase leading to the opening of the return valve in a flow direction of the hydraulic medium during the movement into the end position hydraulic medium volume located in front of the valve seat of the return valve can be increased.
  • the hydraulic pressure acting on the return valve can be reduced or reduced by a separately triggerable pressure reduction leading to the closing of the return valve in a hydraulic medium volume located in the direction of flow of the hydraulic medium when moving into the end position in front of the valve seat of the return valve.
  • the specified working pressure is the hydraulic pressure which arises in the hydraulic medium as a result of a working process, at which the return valve, due to its design, moves into the open position moves.
  • this hydraulic pressure is set in the hydraulic chamber, which extends from the moving part to a sealing surface of the return valve.
  • the structural design is preferably given in that a partial piston surface of a valve piston with a certain force, for example achieved by a spring acting on the valve piston in the closed state with a certain force, sits in the valve seat in the closed state, that is to say forms the said closing surface.
  • the return valve is further preferably designed as a valve piston such that it has a total piston surface 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, a comparatively very low pressure of the hydraulic medium can be sufficient in the open position of the return valve compared to the partial piston area in order to hold the return valve in its open position. The area that supplements the partial piston area to the total piston area can also be acted upon by hydraulic medium in the closed state of the return valve.
  • a pressure of 300 to 600 bar, furthermore for example 400 or 500 bar may be required with respect to the partial piston area in order to lift the return valve out of the valve area, while the total piston area only has a pressure of a few, for example 5.4 or less bar, up to about 0.5 bar, for example, is required to remain in the open position.
  • this pressure acting on the entire piston surface can be generated, for example, by a return spring acting on the moving part.
  • the predetermined working pressure can also be adjustable as such or can be provided adjustable, for example by adjusting the spring force acting on the valve piston in the closed state.
  • the spring can be further compressed or relieved. This can be achieved, for example, by an adjusting screw acting on the spring.
  • the specified working pressure is generally selected to be higher than the pressure required to carry out the punching 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 also be provided in such a way that when the return valve is triggered, the moving part, as far as no further intervention takes place, runs back to its predetermined starting position, provided that no further intervention takes place.
  • a hydraulic pressure at which the return valve is moved into the open position can be achieved by using an action means that is independent of a work process that is carried out with the hand-held device to increase the pressure in the hydraulic fluid volume acting on the return valve becomes.
  • This pressure increase is carried out in the hydraulic medium volume which acts on the partial piston surface of the return valve when the return valve is closed.
  • the pressure may possibly be brief.
  • 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 working process in the hydraulic medium acting on the moving part has not yet regularly reached the predetermined working pressure. It is thus the case 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 hydraulically shifted to the open position independently of a fixed maximum working pressure actually given on the moving part.
  • the return valve preferably closes only after a certain hydraulic pressure acting on the return valve has dropped to such an extent that the pressure load required to hold the return valve in the open position due to the design of the return valve is no longer present.
  • the return valve can operate automatically at a changeable, ie preselected and modified working pressure compared to the specified working pressure are opened, preferably according to the corresponding pressurization of the return valve.
  • the working pressure which is only reached in one working process, can also be adjustable as a modified working pressure.
  • the user can use a setting wheel or buttons on the device to specify a working pressure as a modified working pressure that is less than the maximum permissible working pressure, i.e. the aforementioned 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 maximum working pressure mentioned is actually, but only, to be achieved with greater accuracy.
  • working pressures of 50 to 600 bar can be set continuously or in stages. 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 working pressure which may have been set is reached.
  • the pressure increase is preferably temporary. In terms of time, the pressure increase can only be effective in the range of a few milliseconds, for example over a period of 2 to 5 ms.
  • the pressure increase is carried out in particular by feeding hydraulic medium into the line section given in front of the valve seat with regard to a flow direction of the hydraulic medium.
  • this line section is limited on the one hand by the partial piston surface of the return valve and on the other hand by the piston surface of the moving part.
  • an initial pressure increase for moving the return valve into the open position essentially acts solely on the partial piston surface of the return valve. It also acts essentially decoupled from the moving part, since at the moment of the pressure increase it is only - only - exposed to the hydraulic pressure "in front" of an action means which initiates the pressure increase (viewed with regard to the direction of flow of the hydraulic medium through the open return valve).
  • the initial pressure increase to a trigger pressure of the return valve preferably 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 which is opposite the valve seat surface. ie the partial piston area, increased piston area of the return valve is applied and thus keeps the return valve in the open position even with reduced pressure or decreasing pressure.
  • the pressure increase to reach the trigger pressure therefore preferably takes place only over a narrowly limited range (initially addressed) which only requires such a period of time that the piston of the return valve is raised from the sealing position.
  • the pressure increase can be carried out by blocking or throttling (for example reducing the cross-section) the line section in an area in the backflow direction of the hydraulic medium upstream of the return valve.
  • throttling for example reducing the cross-section
  • it can be a displaceable closure part which acts in the manner of a slide or a valve tip.
  • a shut-off means is preferably provided, which can be releasably relocated, for throttling or shutting off the line section.
  • the shut-off means can be a magnet-actuated, in particular electromagnetically actuated, closure means, which is preferably spring-loaded in the direction of a passage position.
  • Hydraulic medium is introduced, preferably pumped in, to increase the pressure in the section of the line section which results between the shut-off means and the return valve, hereinafter referred to as the second section.
  • the hydraulic medium introduced causes the desired linear displacement of the moving part when the shut-off means is open.
  • the hydraulic medium volume acting on the moving part is preferably separated from the second line section which is further supplied with hydraulic medium.
  • the resulting pressure increase thus preferably acts exclusively on the partial piston surface of the return valve.
  • the course of forces in the course of the closing process is preferably selected such that the highest force is reached towards the end, ie shortly before closing.
  • the line section is suddenly shut off or throttled. This can be done manually by the user, for example using a correspondingly provided lever arrangement.
  • an electromagnetic displacement of a valve for example a linearly displaceable solenoid valve, is preferred.
  • the return of the moving part to the end position can be stopped, in particular with a strong will.
  • the device can thus be put back into a standby position more quickly.
  • the return of the moving part can be stopped and a pressure reduction can be achieved in the area of the line section between the shut-off device and the return valve (second line section), which pressure drop leads to a displacement of the return valve into the Lock position leads.
  • the pressure in the (first) line section between the shut-off device and the moving part remains, here, for example, 300 bar.
  • the pressure in the second line section rises almost suddenly, except for the trigger pressure for the return valve of, for example, 600 bar. This necessitates further feeding (pumping) of Hydraulic fluid in this line section. The pressure in the second line section then drops again.
  • a pressure sensor can be provided in the area of the second line section, which can detect when the pressure drop in the second line section is large enough that the shut-off means can open again.
  • a pressure sensor can also be arranged in the first line section or directly associated with the hydraulic chamber. When the shut-off means is actuated, the pressure sensor arranged in the second line section is decoupled from the pressure prevailing in the hydraulic chamber and only measures the short-term and very strongly increasing pressure in the second line section. If, as preferred and explained further below, the shut-off state ends automatically, a pressure sensor in the second line section is also unnecessary. The pressure curve in the hydraulic space can then be continuously monitored with the pressure sensor in the first line section.
  • a return of the moving part as a function of a pressure value measured by a pressure sensor is triggered by the automatic opening of the return valve thereon, and that the working pressure, as already mentioned above, at which the opening of the return valve is triggered, is adjustable.
  • the adjustability of the hydraulic or working pressure, with which a workpiece or the like acts via the moving part enables an adaptation, for example, to the workpiece conditions that can be brought about in a very simple manner by the user. For example, softer, more easily deformable Materials are subjected to a lower working or hydraulic pressure than harder materials. Workpieces with different parameters can be processed 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 design.
  • This pressure, at which the return valve is brought into the open position due to its design is referred to as the specified working pressure.
  • the selected, set working pressure can, however, as already stated above, be chosen to match the specified predetermined working pressure. Regardless of the selected working pressure, the specified working pressure remains unchanged. It is irrelevant only as long as a selected working pressure is provided below or in accordance with the specified working pressure.
  • An adjustment device for different, selectable working pressures can be provided.
  • This can be an adjusting wheel or a setting slide, alternatively an arrangement of a plurality of keys, each key being assigned a predetermined working pressure.
  • a keyboard with an associated display can also be provided.
  • a setting of the selectable working pressure can optionally or alternatively also be carried out via a non-mechanical interface, in particular a radio and / or optical interface to the device.
  • a display can also be provided which reflects the actually selected working pressure.
  • the manually operated switch is the switch that a user must actuate, in particular press, in order to start and (continue) to carry out an operation of the device.
  • the return of the moving part is triggered when the load is released, it can also be provided that the return of the moving part is ended by repeated actuation. This can be achieved in particular if the line section is shut off or throttled when it is actuated again, for example (again) an electrical voltage is applied to the solenoid valve to shut off the line section. The resulting pressure drop in the second line section between the shut-off area and the return valve causes the return valve to close.
  • the return can be achieved in that the return valve, which also opens when a predetermined working pressure is reached, is shifted to an open position using one of the measures already described, which leads to a return of the hydraulic medium acting on the moving part.
  • the return valve can also be opened mechanically, for example electromechanically, for example depending on the detection of a cancellation of the switch application.
  • the return valve is acted on directly, for example via a linkage, when the return valve is designed as a valve piston, for example via a related piston rod.
  • Switching can be sensed.
  • the motor current of a drive driving the hydraulic pump can also be monitored, for example. This is particularly the case if the operation of the hydraulic pump is directly dependent on the switch action. If the relevant motor current ceases to exist, this is regarded as the removal of the switch application.
  • a signal to open the return valve can be generated.
  • the opening of the return valve can be achieved by increasing the hydraulic pressure acting on the return valve.
  • the return of the moving part only takes place by a corresponding switch actuation, in particular, therefore, by removing the action on the manually operated switch, if a first workpiece contact has previously been determined on the device side.
  • a corresponding contact or proximity sensor can be provided for this purpose.
  • 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.
  • the return valve can also be moved, 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 servo motor acts, to trigger the return movement of the moving part into the open position.
  • a complete return of the moving part is initially waited for before a next actuation is released.
  • a predefined fixed time period of 5 or 10 seconds can be predefined.
  • it can also be determined via the pressure sensor whether the return (completely) 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 trigger pressure of the return valve is reached, but instead the return can be initiated specifically when the intended processing has been carried out, a battery-operated one can Handheld device with a charged accumulator significantly more operations are carried out than with solutions in which the fixed trigger pressure must always be achieved with each operation.
  • the shutdown cannot always take place at the desired pressure despite a pressure sensor being provided. 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 rivets, since, depending on the material, the rivets may be overpressed. Due to the brief pressure increase acting on the return valve, there is a rapid drop in pressure at the moving part after opening the return valve. The reaction, i.e. the return valve is opened in a time range of one or a few milliseconds. It can also be a time range of a few milliseconds, for example two, four or five 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 storage space 3 and a movement part 4 designed as a hydraulic piston.
  • the moving part 4 is movable 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, in Figure 1 shown tool holder.
  • it can also be the hydraulic piston (see for example Figure 3 ).
  • the hydraulic space 6 comprises the space into which hydraulic fluid is pumped. This begins on the pressure side of the hydraulic pump. As for example in Figure 3 shown, the hydraulic chamber 6 has a return line 7, via which the hydraulic medium can flow back into the hydraulic medium storage chamber 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 one opposite Figure 3 changed position.
  • the hydraulic piston or the moving part 4 moves back in the direction according to his rest position Figure 3 .
  • 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 immediately before the return valve 8 even 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.
  • 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 flow bore 13 is provided in the valve seat, possibly in the screw-in part 12. In terms of flow, this is connected to the return line 7.
  • the return valve 8 opens only when a certain trigger pressure is exceeded. It is the specified working pressure mentioned at the beginning. This trigger pressure can be, for example, 600 or 700 bar.
  • the pressure of the hydraulic medium is no longer present only on the surface corresponding to the cross-sectional area of the flow bore 13, a partial piston surface, for example given by a valve needle 14, but on the entire surface facing the hydraulic chamber (lower surface 17 ) of the return valve piston 15 having the valve needle 14 of the return valve 8. Therefore, the opened return valve 8 is 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 ideally tapered. In any case, it is preferably conical.
  • this pressure is preferably generated 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 in the outflow flow direction after the throughflow bore 13.
  • the pressure in particular 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 essentially equalizes itself and is usually only comparatively small soon after the beginning of the return movement of the moving part.
  • the space 26 adjoining the flow-through 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 through an outlet opening 18 into the storage space 3.
  • the space 26 is also referred to above and below as the valve space.
  • the hydraulic or trigger pressure lifting the valve needle 14 out of the valve seat corresponds to the specified working pressure on the moving part 4.
  • shut-off means 19 is provided in the hydraulic space upstream of the return valve 8.
  • This shut-off means 19 can, as is also preferred, be designed as an electrically actuated solenoid valve.
  • the shut-off means 19 essentially consists of a linearly displaceable shut-off piston 20 with a conical locking surface and an electrically controllable actuating magnet 21.
  • the shut-off means 19, in particular the shut-off piston 20, is arranged so as to protrude into the return line 7.
  • the shut-off piston 20 is suitable for dividing the return line 7 for a given blocking thereof into a first line section 22, viewed in the return direction of the hydraulic medium, between the moving part 4 and the shut-off means 19 and a second line section between the shut-off means 19 and the return valve 8.
  • shut-off piston 20 is loaded into an open position from its valve seat position, in which a separation of the first and second line sections has been achieved.
  • a return spring 24, in particular in the form of a compression spring, can be provided for the corresponding pretensioning.
  • Hydraulic medium is fed in to advance the moving part 4 in the direction of the working position when the shut-off means 19 is open in the region of the second line section 23.
  • a check valve 25 is provided here.
  • the hand-held device 1 preferably has an adjusting 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 set the above-described selected working pressure, which is modified in relation to the specified working pressure (or in individual cases also corresponds to it). Reference should also be made at this point to the further, possibly alternative possibilities of the radio connection etc. mentioned at the beginning.
  • a working pressure of 200 bar or 300 bar that triggers the return valve can be preselected.
  • An evaluation / control electronics evaluates pressure measurement values of a pressure sensor 29, 29 'in the course of the movement of the moving part 4 in the direction of the working position and compares these with the pressure setpoint specified via a key 28.
  • the pressure sensor 29 ' can clearly be seen as a pressure sensor be that is directly assigned to the hydraulic chamber 6.
  • a pressure sensor 29 can also be present in the return line 7, if appropriate also, for example in FIG Figure 4 shown, be arranged in the second line section 23.
  • the shut-off piston 20 preferably automatically moves back into the open position and a pressure measurement is not necessary for this purpose, but on the other hand, when the shut-off piston 20 is in the closed position, the pressure sensor 29 no longer measures the pressure of the hydraulic chamber 6 can, it is preferred that in any case the pressure sensor 29 'directly assigned to the hydraulic space 6 is provided, and further preferably only this pressure sensor 29' is provided.
  • shut-off piston 20 also moves abruptly into the feed position as shown in FIG Figure 5 .
  • the preferred conical sealing surface of the shut-off piston 20 seals against the facing opening edge of the first line section 22.
  • shut-off piston 20 is shifted, in particular spring-loaded, into the open position and thus raised from the valve seat, so that the hydraulic medium can return from the hydraulic chamber 6 back into the hydraulic medium storage chamber 3, the return valve 8 being held in the raised position for so long. until the moving part 4 according to the end position Figure 3 reached and / or the opening holding pressure for the return valve 8 is below.
  • the displacement of the shut-off piston 20 in the open position can be set differently.
  • the actuating magnet 21 is preferably designed with such a small force acting on the shut-off piston 20 that the pressure difference generated by the shut-off piston 20 between the hydraulic chamber 6 and the second line section 23 after the return valve 8 has opened, regardless of whether the shut-off piston 20 is still through is applied to the solenoid 21 is pressed into the open position. For example, this can occur at a pressure difference of 1 bar or more.
  • This shift into the open position is also desirable and necessary, since if the closure is too long due to the hydraulic medium draining off in the second line section 23, the pressure at which the return valve 8 closes could be undershot again. It can further be provided that the actuation of the actuating magnet 21 is time-controlled.
  • the actuation magnet 21 required for this purpose is present for a predetermined period of time, preferably also in the range from milliseconds to tenths of a second. If, how next preferred and already mentioned, the aforementioned force, which acts on the shut-off piston 20, is set to be correspondingly low, regardless of the fact that the actuating magnet of the shut-off piston is still acted upon by the pressure difference mentioned, it can also be moved back into an open position.
  • the opening force which acts on the shut-off piston is of course also dependent on the area which the shut-off piston shuts off at the transition from the first to the second line section 22 or 23. This is accordingly also chosen such that the opening mentioned preferably sets itself automatically, regardless of whether the actuating magnet is acted upon.
  • the pressure increase at the return valve 8 by shutting off the return line 7 by means of the shut-off means 19 can have an initial effect.
  • the pressure prevailing due to the return of the moving part 4 acts on the return valve 8.
  • the electrical action on the shut-off means 19 can also initially take place in a pulsed manner, so that after the shut-off piston 20 has been fully advanced, the shut-off piston 20 moves almost suddenly into the advanced position Figure 5 located.
  • the shut-off piston 20 remains in the raised position which releases the return line 7 or connects the line sections 22 and 23.
  • a premature electrical action of the shut-off means 20 before the movement part has completely moved back can close the return line and thus separate the first and second line sections 22, 23, resulting in such a situation Pressure drop in the flow direction upstream of the return valve 8, correspondingly in the second line section 23, so that a desired closure of the return valve 8 is achieved as a result.
  • the forward movement of the moving part 4 into the working position is preferably only maintained 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 activation of the shut-off means 19 and thus to a pressure increase in the second line section 23 in the backflow direction upstream of the return valve 8. 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.
  • releasing the switch does not lead to a standstill of the pump at exactly the same time, but rather the pump or a motor acting on this switches off with a delay.
  • the delay is selected so that the required pressure increase can be achieved, for example in the range from a few milliseconds to tenths of a second.
  • the shut-off piston 20 can be arranged in the same direction as the return valve 8.
  • the longitudinal axes of the shut-off piston 20 and return valve 8 can run parallel to one another.
  • FIGS. 8 to 11 show a second embodiment of a hand-held device 1. In terms of functionality, this is essentially identical to the previously described first embodiment.
  • the handheld device 1 also has a return valve 8 that can be controlled via a trigger pressure, for connecting the return line 7 to the hydraulic fluid reservoir 3.
  • an electromagnetically actuated shut-off means 19 is also provided here for acting on the hydraulic fluid volume located in the return flow direction of the hydraulic fluid before the return valve 8.
  • shut-off means 19 The function and mode of operation of the shut-off means 19 is the same as the exemplary embodiment described above.
  • the return valve 8 also acts essentially the same as the exemplary embodiment described above, in particular with regard to the triggering of the return valve 8 and the associated lifting of the return valve piston 15 into a position connecting the return line 7 to the outlet opening 18 of the storage space 3.
  • the raised return valve position in which the return valve piston 15 is displaced out of the valve seat to release the return path to the storage space 3, can be locked in this exemplary embodiment.
  • the return valve piston 15, facing away from the end having the valve needle 14, can have a waist-like circumferential constriction 26. This results in a rear grip area in which, in the raised return valve piston position, according to the Figures 10 and 11 a locking finger 30 spring-loaded in the blocking direction is immersed.
  • the locking finger 30 acts transversely to the longitudinal extent and to the direction of displacement of the return valve piston 15.
  • the locking finger 30 is held in a housing section 31 such that it can be displaced linearly.
  • a compression spring 32 acts on the locking finger 30, specifically loading the locking finger 30 in the direction of the return valve piston 15.
  • an actuating section 33 is integrally formed thereon, projecting freely above the housing section 31, via which the blocking finger 30 can be moved back as a result of a pulling movement against the action of the compression spring 32, which releases the return valve piston 15 has the consequence. The latter falls back due to the action of the pressure spring 10 in the valve seat position, in which the return path is blocked.
  • the return of the return valve piston 15 into the valve seat position is preferably also possible in this embodiment only if the hydraulic pressure acting on the entire piston surface is reduced to a level which permits this displacement of the piston into the valve seat position.
  • This can be achieved with the complete return of the moving part 4 to a starting position or also by activating the shut-off means 19 in the course of the return movement of the moving part 4, in the latter case also when the moving part 4 has not completely returned due to the shut-off of the return line 7 in the resultant line second line section 23 sets a pressure reduction, which allows the return movement of the return valve piston 15 into the valve seat position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Fluid-Driven Valves (AREA)
  • Magnetically Actuated Valves (AREA)

Claims (14)

  1. Procédé de fonctionnement d'un dispositif à main à fonctionnement hydraulique (1), par exemple d'un dispositif de pressage et/ou d'un dispositif de poinçonnage ou de découpage, dans lequel le dispositif à main (1) comprend 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 du fluide hydraulique provenant d'une chambre de stockage (3) en utilisant la pompe hydraulique, dans lequel peut être obtenu que la pièce mobile (4) soit automatiquement ramenée de la position de travail à une position finale par une ouverture de la soupape de retour (8) lorsqu'une pression de travail prédéterminée est atteinte, caractérisé en ce que la pression hydraulique agissant sur la soupape de retour (8) pour déclencher un déplacement de la partie mobile (4) dans la position finale, est augmentée par une augmentation de pression, déclenchable séparément et conduisant à l'ouverture de la soupape de retour (8), dans un volume de fluide hydraulique situé devant le siège de soupape de la soupape de retour (8) dans le sens d'écoulement du fluide hydraulique lors du déplacement dans la position finale.
  2. Procédé selon la revendication 1, caractérisé en ce que la pression hydraulique agissant sur la soupape de retour (8) est réduite par une réduction de pression, déclenchable séparément et conduisant à la fermeture de la soupape de retour (8), dans un volume de fluide hydraulique situé devant le siège de soupape de la soupape de retour (8) dans le sens d'écoulement du fluide hydraulique lors du déplacement dans la position finale.
  3. Procédé selon la revendication 2, caractérisé en ce que, pour obtenir la réduction de pression, un tronçon de conduit est fermé ou étranglé en amont de la soupape de retour (8) dans ledit sens d'écoulement.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que, pour obtenir une augmentation de pression, un tronçon de conduit est fermé ou étranglé en amont de la soupape de retour (8) dans ledit sens d'écoulement et du fluide hydraulique est introduit dans le tronçon de conduit ainsi fermé ou étranglé pour augmenter la pression.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que la pompe à fluide hydraulique refoule dans un deuxième tronçon de conduit (23) à travers lequel s'écoule également le fluide hydraulique qui est en écoulement lorsque la soupape de retour (8) est ouverte.
  6. Procédé selon la revendication 5, caractérisé en ce que le deuxième tronçon de conduit (23) est fermé pour obtenir l'augmentation de pression.
  7. Dispositif à main à fonctionnement hydraulique (1), par exemple dispositif de pressage ou dispositif de poinçonnage ou de découpage, dans lequel le dispositif à main (1) comprend 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 de stockage (3) en utilisant la pompe hydraulique, dans lequel il peut être obtenu que la pièce mobile (4) soit automatiquement ramenée de la position de travail à une position finale par une ouverture de la soupape de retour (8) lorsqu'une pression de travail prédéterminée est atteinte, caractérisé en ce que la pression hydraulique agissant sur la soupape de retour (8) pour déclencher un déplacement de la partie mobile (4) dans la position finale, peut être augmentée par une augmentation de pression, déclenchable séparément et conduisant à l'ouverture de la soupape de retour (8), dans un volume de fluide hydraulique situé devant le siège de soupape de la soupape de retour (8) dans le sens d'écoulement du fluide hydraulique lors du déplacement dans la position finale.
  8. Dispositif à main selon la revendication 7, caractérisé en ce que la pression hydraulique agissant sur la soupape de retour (8) peut être réduite par une réduction de pression, déclenchable séparément et conduisant à la fermeture de la soupape de retour (8), dans un volume de fluide hydraulique situé devant le siège de soupape de la soupape de retour (8) dans le sens d'écoulement du fluide hydraulique lors du déplacement dans la position finale.
  9. Dispositif à main selon la revendication 8, caractérisé en ce que, pour obtenir la réduction de pression, un tronçon de conduit peut être fermé ou étranglé en amont de la soupape de retour (8) dans ledit sens d'écoulement.
  10. Dispositif à main selon l'une des revendications 7 à 9, caractérisé en ce que, pour obtenir une augmentation de pression, un tronçon de conduit peut être fermé ou étranglé en amont de la soupape de retour (8) dans ledit sens d'écoulement et du fluide hydraulique peut être introduit dans le tronçon de conduit ainsi fermé ou étranglé pour augmenter la pression.
  11. Dispositif à main selon l'une des revendications 7 à 10, caractérisé en ce que la pompe à fluide hydraulique refoule dans un deuxième tronçon de conduit (23) à travers lequel s'écoule également le fluide hydraulique en écoulement lorsque la soupape de retour (8) est ouverte.
  12. Dispositif à main selon la revendication 11, caractérisé en ce que le deuxième tronçon de conduit (23) peut être fermé pour obtenir l'augmentation de pression.
  13. Dispositif à main selon la revendication 12, caractérisé en ce que le moyen de fermeture (19) est précontraint en position ouverte.
  14. Dispositif à main selon l'une des revendications 12 ou 13, caractérisé en ce que le moyen de fermeture (19) consiste en un moyen d'obturation à actionnement magnétique.
EP17730729.5A 2016-06-29 2017-06-08 Procédé servant à faire fonctionner un appareil portatif à fonctionnement hydraulique, ainsi qu'appareil portatif à fonctionnement hydraulique Active EP3478452B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016111874.5A DE102016111874A1 (de) 2016-06-29 2016-06-29 Verfahren zum Betreiben eines hydraulisch betriebenen Handgerätes sowie hydraulisch betriebenes Handgerät
PCT/EP2017/063895 WO2018001691A1 (fr) 2016-06-29 2017-06-08 Procédé servant à faire fonctionner un appareil portatif à fonctionnement hydraulique, ainsi qu'appareil portatif à fonctionnement hydraulique

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EP3478452A1 EP3478452A1 (fr) 2019-05-08
EP3478452B1 true EP3478452B1 (fr) 2020-07-29

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US (1) US11612990B2 (fr)
EP (1) EP3478452B1 (fr)
KR (1) KR102380705B1 (fr)
CN (1) CN109562508B (fr)
AU (1) AU2017290411B2 (fr)
DE (1) DE102016111874A1 (fr)
WO (1) WO2018001691A1 (fr)

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CN113858332B (zh) * 2021-10-22 2024-01-26 广东喜珍电路科技有限公司 一种成型大排版尺寸pcb自动上销钉的方法
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Publication number Publication date
DE102016111874A1 (de) 2018-01-04
KR20190022823A (ko) 2019-03-06
EP3478452A1 (fr) 2019-05-08
CN109562508A (zh) 2019-04-02
CN109562508B (zh) 2021-03-16
US11612990B2 (en) 2023-03-28
AU2017290411A1 (en) 2019-01-17
WO2018001691A1 (fr) 2018-01-04
KR102380705B1 (ko) 2022-03-29
US20200147772A1 (en) 2020-05-14
AU2017290411B2 (en) 2022-07-07

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