EP2249994B1 - Hydraulic pressure supply unit for a power screwdriver - Google Patents

Hydraulic pressure supply unit for a power screwdriver Download PDF

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Publication number
EP2249994B1
EP2249994B1 EP09719703A EP09719703A EP2249994B1 EP 2249994 B1 EP2249994 B1 EP 2249994B1 EP 09719703 A EP09719703 A EP 09719703A EP 09719703 A EP09719703 A EP 09719703A EP 2249994 B1 EP2249994 B1 EP 2249994B1
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EP
European Patent Office
Prior art keywords
pressure
supply unit
supply
hydraulic pressure
connector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP09719703A
Other languages
German (de)
French (fr)
Other versions
EP2249994A1 (en
Inventor
Bernd Thelen
Ulf Sittig
Günter Andres
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.)
Wagner Vermoegensverwaltungs GmbH and Co KG
Original Assignee
Wagner Vermoegensverwaltungs GmbH and Co KG
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Filing date
Publication date
Application filed by Wagner Vermoegensverwaltungs GmbH and Co KG filed Critical Wagner Vermoegensverwaltungs GmbH and Co KG
Priority to PL09719703T priority Critical patent/PL2249994T3/en
Publication of EP2249994A1 publication Critical patent/EP2249994A1/en
Application granted granted Critical
Publication of EP2249994B1 publication Critical patent/EP2249994B1/en
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Anticipated expiration legal-status Critical

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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
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/004—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type
    • B25B21/005—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type driven by a radially acting hydraulic or pneumatic piston
    • 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
    • B25B29/00—Accessories
    • B25B29/02—Bolt tensioners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • F15B11/032—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/25—Pressure control functions
    • F15B2211/251—High pressure control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3052—Shuttle valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3138—Directional control characterised by the positions of the valve element the positions being discrete
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/76—Control of force or torque of the output member

Definitions

  • Such a pressure supply unit is described in WO 03/097304 A1 (Wagner ).
  • the two ports of the pressure delivery unit are connected to the cylinder of a power wrench.
  • the piston located in the cylinder is thereby reciprocally driven, wherein it rotates stepwise by means of a ratchet mechanism, the screw to be rotated.
  • the reversal of the connections takes place with a stroke control device as a function of the change in the hydraulic pressure measured in time intervals.
  • the working process is ended when the increase in the hydraulic pressure during a load stroke within a predetermined time is less than a predefined limit value.
  • Another possibility provides that during the load stroke, the time change of the hydraulic pressure is measured in time intervals and a switchover to the return stroke, if in at least one of the time intervals, the pressure is one stitch greater than in at least one of the preceding intervals of the operation.
  • screwing technology In screwing technology, a distinction is made between screwing and clamping methods.
  • a screw In a screwing process, as in WO 03/097304 A1 is described, a screw is rotated by means of hydraulic force.
  • piston cylinder units are usually used.
  • the pressure is up to 800 bar.
  • a tensioning process as in US 4,246,810 is described, a bolt is stretched by means of an axial biasing force, so that the seated on the bolt nut can be easily rotated.
  • Tensioning processes work with a hydraulic high pressure of up to 2000 bar. Both systems require hydraulic power units that generate the corresponding pressures. Therefore, dedicated pressure feed units are used for each of the two bolting procedures.
  • a hydraulic supply unit with a pressure generator and a pressure booster for a high pressure application is described in DE 102 49 524 B4 ,
  • the pressure booster is in extension of the pressure generator and in one common housing arranged with the pressure generator. Consequently, the entire unit must always be carried along.
  • the AT 008 986 U1 shows a pressure-supply unit according to the preamble of claim 1.
  • the pressure supply unit according to the invention is defined by the patent claim 1. It is characterized in that a pressure booster is provided which has a first piston part of larger diameter and a second piston part of smaller diameter, wherein the first piston part of the pressures of the first and the second port is controlled alternately and the second piston part at a high pressure port a high pressure generated, which is greater than the delivery pressure, wherein a high pressure device is connected to the high pressure port.
  • the invention offers the advantage that the same hydraulic pressure supply unit for the screwing and a high-pressure application, for. B. the clamping method, is usable.
  • the pressure booster is additionally used, which is inactive during the screwing process.
  • the user therefore only needs to purchase a single device which is suitable for each of the two screwing methods, that is to say can be used for a screwdriving drive or for a clamping device.
  • the reversal of the piston of the pressure booster is carried out by the same stroke control device, which also performs the stroke control for the screwing operation. So there is no additional Hub Kunststoff for the pressure intensifier required.
  • the pressure booster can consist of a relatively simple and inexpensive part without own control.
  • the pressure supply unit according to the invention With the pressure supply unit according to the invention, the user has the opportunity to use the same device for both Verschraubungsbacter. As a result, the device costs are reduced for the user.
  • the additional pressure booster does not need its own stroke control device for the alternately moving booster piston.
  • the pressure supply unit according to the invention is of compact design, low weight and consists of few components. With the system according to the invention, one or more hydraulic working devices can be operated simultaneously.
  • the pressure intensifier is contained in a separate module which is removably attached to the pressure generating unit.
  • the pressure booster forms an accessory that can be selectively mounted when the pressure supply unit is to be used for a tensioner.
  • the pressure booster module does not contain its own stroke control device, but uses that of the basic device. It is also possible to connect the pressure intensifier module in different ways to the basic unit. This includes the direct coupling to the basic unit, the connection via hydraulic connecting pieces and the connection via longer hose or piping, where the pressure intensifier module is a self-installable unit.
  • the stroke control device includes a Hubschaltventil, which makes the switching of the delivery pressure between the first and second port in response to the change in pressure over time.
  • the control can take place according to one of the methods described in US Pat WO 03/097304 A1 are described.
  • a manual actuation of the Hubschaltventils is possible directly or via a radio link.
  • the adjustment of the high pressure is advantageously carried out on a pressure relief valve with which the delivery pressure is set.
  • the High pressure differs from the delivery pressure by a structurally specified factor.
  • With the pressure relief valve on the one hand in a screwing the delivery pressure and on the other hand in a tensioning process of the high pressure can be varied. To set both pressures so only one pressure relief valve is required.
  • a relief valve should be provided on the pressure intensifier, which can be opened manually and, when open, connects the first port to the high pressure port.
  • a preferred embodiment of the invention has a control unit which continuously adds the number of working strokes during operation of the bolt tensioning device with the high pressure in order to determine the expiration of a maintenance interval.
  • a running count of the strokes is done.
  • the available service life is limited by a certain limit stroke rate.
  • a pressure generating unit 10 which generates a delivery pressure for a power wrench 11, which is represented here only by a piston-cylinder unit.
  • the pressure generator 10 includes a pump 12 which is driven by a motor 13 and pumps hydraulic fluid from a tank 25 to create a pressure.
  • the pressure is supplied to each input of a switching valve 14 for flow and a switching valve 15 for return.
  • the switching valve 14 has an outlet 14 a, which is connected to a first port 16.
  • the switching valve 15 has a first outlet 15 a, which is connected to a second port 17.
  • the connections 16 and 17 are couplings for the hydraulic coupling of the power wrench 11.
  • the control of the switching valves 14 and 15 is effected by a respective control cylinder 14b, 15b.
  • the control cylinder 14b is controlled by the pressure at the outlet 15a.
  • the control cylinder 15b is controlled by a lift control valve 20, which is a solenoid valve operated in response to the signals of a control unit.
  • the stroke control valve connects in a (in FIG. 1 shown) first position the control cylinder 15b with the return line 26 and in a second position the control cylinder 15b with the pressure line 18 of the pump 12th
  • the outlet 15 a of the switching valve 15 is connected to the return line 26 via a pressure relief valve 21 for the back pressure, which is set to 100 bar.
  • the outlet 14a of the switching valve 14 is connected via an adjustable pressure relief valve 24, which is adjustable between 0 and 800 bar, with another return 26a.
  • the pressure limiting valve 24 generates the delivery pressure PL, which is supplied to the terminal 16.
  • the return pressure PR is generated, which is limited by the pressure limiting valve 21.
  • the port 17 is connected to a pressure transducer 22 and the port 16 is connected to a pressure transducer 23.
  • the electrical signals corresponding to the pressures are supplied to the control unit, which controls the lift switching valve 20 in response thereto.
  • the control of the power wrench 11 is effected in response to the pressures of the pressure transducers 22 and 23 in the manner as in FIG WO 03/097304 A1 which is incorporated by reference into the present specification.
  • a pressure booster 30 is provided, which is contained in a separate module 31.
  • the module 31 has a high pressure port 32, to which a high pressure device, here a clamping cylinder unit 33, can be connected.
  • the clamping cylinder unit 33 is operated at a pressure which is considerably greater than that of the power wrench 11. For this reason, the high pressure PH is generated by the pressure booster 30.
  • the supply pressure PL varies from 0 to 800 bar, the high pressure PH can be up to 2000 bar.
  • a manually operated unlocking valve 35 serves to relieve the high pressure port 32 to depressurize the clamping cylinder.
  • the pressure booster 30 has a port D which is connected to the port 16 of the pressure generating unit and a port E which is connected to the port 17 of the pressure generating unit. To the Ports E and D are alternately the supply pressure PL generated while the other port is connected to the return.
  • the pressure generating unit 10 includes a pressure gauge 25, which indicates the delivery pressure.
  • the module 31 includes a pressure gauge 36 indicative of high pressure.
  • the module 31 with the pressure amplifier 30 is in FIG. 2 shown.
  • the module has a block 40 which contains a cylinder 41 with a booster piston 42 displaceable therein.
  • the cylinder 41 has a large cylinder bore 43 and an adjoining small cylinder bore 44.
  • the booster piston 42 has a first piston part 45 of large diameter and a second piston part 46 of small diameter.
  • the piston area of the first piston part 45 is F1 and the piston area of the second piston part 46 is F2.
  • the areas F1 and F2 are in the ratio 3: 1.
  • the cylinder space bounded by the piston surface F1 is connected to the port D.
  • the rear space 47 is connected to the terminal E.
  • the small piston surface F2 defines a high pressure chamber 48, which is connected via a check valve 49 to the high pressure port 32.
  • the booster piston 42 extends a longitudinal bore containing a check valve 50.
  • the delivery pressure which acts on the piston surface F1
  • the area ratio F1: F2 arises in the high-pressure chamber 48, an increased pressure.
  • the delivery pressure is increased to the magnitude of the high pressure.
  • a relief valve 52 which is to be operated with a handle 53, serves to remove the high pressure from the clamping cylinder unit 33, to relieve this.
  • the relief valve 52 includes a spring-loaded ball which is urged against a valve seat and can be removed from the valve seat by a pin 54 of the handle. When open, this connects Relief valve 52 the port D to the high pressure port 32 so that it is relieved to the return.
  • the pressure generating unit 10 is used only in conjunction with a power wrench 11 or with a clamping cylinder unit 33, but not with both together.
  • a power wrench 11 is connected to the connections 16, 17 or the module 31.
  • the stroke control of the piston 42 of the pressure booster 30 takes place through the lift switching valve 20 in the same control as in the power wrench operation.
  • FIGS. 3, 4 and 5 show different variants of the attachment of the module 31 to the pressure generating unit.
  • the pressure generating unit has a housing 60 containing the pump 12 and the motor 13. This housing is closed at a front end by a distributor block 61, which the in FIG. 1 illustrated valve assembly carries.
  • the distribution block also carries the manometer 25. From the outside is accessible to the manifold block, the pressure relief valve 24 for adjusting the delivery pressure PL and thus also the high pressure PH.
  • the distribution block has the front side of the terminals 16 and 17, to which either a power wrench or a module 31 can be connected.
  • the terminals 16 and 17 may be provided in duplicate, each unused ports are closed.
  • the module 31 has the relief valve 52, the handle is accessible from the outside. In addition, the high-pressure port 32 can be seen.
  • an attachment 62 which contains the electronic control unit 63 which controls the lift control device with the lift control valve 20.
  • the control unit 63 receives inter alia the signals of the pressure sensors 22 and when operating the pressure supply unit with a clamping cylinder, it also provides an indication of the number of strokes carried out.
  • the Figures 3 - 5 show different ways of attaching the module 31 to the manifold block 61 by direct connection or with hoses 64.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Abstract

The pressure supply unit has a pressure generating assembly (10), which generates a supply pressure (PL) for the intermittent operation of a power screwdriver (11). So as to allow a tensioning cylinder unit (33) to be operated alternatively to the power screwdriver (11), which requires higher pressure, a pressure intensifier (30) is provided which is included in a separate module (31) and generates high pressure (PH) from the supply pressure (PL). The reversal of the pressure intensifier (30) for carrying out strokes is achieved by the same stroke switch valve (20) which otherwise performs the reversal of the power screwdriver (11).

Description

Die Erfindung betrifft eine hydraulische Druckliefereinheit für einen Kraftschrauber, mit

  • einem Druckerzeugungsaggregat, das einen Lieferdruck erzeugt,
  • einer Hubsteuereinrichtung, die den Lieferdruck wechselseitig einem ersten Anschluss und einem zweiten Anschluss zuführt und den jeweils anderen der beiden Anschlüsse mit einem Rücklauf verbindet.
The invention relates to a hydraulic pressure supply unit for a power screwdriver, with
  • a pressure generating unit that generates a delivery pressure,
  • a stroke control device which alternately supplies the delivery pressure to a first port and a second port and connects the respective other of the two ports to a return port.

Eine derartige Druckliefereinheit ist beschrieben in WO 03/097304 A1 (Wagner ). Die beiden Anschlüsse der Druckliefereinheit werden mit dem Zylinder eines Kraftschraubers verbunden. Der in dem Zylinder befindliche Kolben wird dadurch hin- und hergehend angetrieben, wobei er über einen Ratschenmechanismus die zu drehende Schraube schrittweise weiterdreht. Die Umsteuerung der Anschlüsse erfolgt mit einer Hubsteuereinrichtung in Abhängigkeit von der in Zeitintervallen gemessenen Änderung des hydraulischen Drucks. Der Arbeitsvorgang wird dann beendet, wenn der Anstieg des hydraulischen Drucks bei einem Lasthub innerhalb einer vorgegebenen Zeit kleiner ist als ein vorgegebener Grenzwert. Eine andere Möglichkeit sieht vor, dass beim Lasthub die zeitliche Änderung des hydraulischen Druckes in Zeitintervallen gemessen wird und eine Umschaltung auf den Rückhub erfolgt, wenn in mindestens einem der Zeitintervalle der Druck einen Stich größer ist als in mindestens einem der vorhergehenden Intervalle des Arbeitsvorganges.Such a pressure supply unit is described in WO 03/097304 A1 (Wagner ). The two ports of the pressure delivery unit are connected to the cylinder of a power wrench. The piston located in the cylinder is thereby reciprocally driven, wherein it rotates stepwise by means of a ratchet mechanism, the screw to be rotated. The reversal of the connections takes place with a stroke control device as a function of the change in the hydraulic pressure measured in time intervals. The working process is ended when the increase in the hydraulic pressure during a load stroke within a predetermined time is less than a predefined limit value. Another possibility provides that during the load stroke, the time change of the hydraulic pressure is measured in time intervals and a switchover to the return stroke, if in at least one of the time intervals, the pressure is one stitch greater than in at least one of the preceding intervals of the operation.

In der Verschraubungstechnologie unterscheidet man zwischen Schraubverfahren und Spannverfahren. Bei einem Schraubverfahren, wie es in WO 03/097304 A1 beschrieben ist, wird mittels hydraulischer Kraft eine Schraube gedreht. Hierzu werden üblicherweise Kolbenzylindereinheiten eingesetzt. Der Druck beträgt bis zu 800 bar. Bei einem Spannverfahren, wie es in U.S. 4,246,810 beschrieben ist, wird ein Schraubbolzen mittels einer axialen Vorspannkraft gedehnt, so dass die auf dem Bolzen sitzende Mutter leicht gedreht werden kann. Spannverfahren arbeiten mit einem hydraulischen Hochdruck von bis zu 2000 bar. Beide Systeme benötigen Hydraulikaggregate, die die entsprechenden Drücke erzeugen. Daher werden für jedes der beiden Verschraubungsverfahren speziell dafür konzipierte Druckliefereinheiten verwendet.In screwing technology, a distinction is made between screwing and clamping methods. In a screwing process, as in WO 03/097304 A1 is described, a screw is rotated by means of hydraulic force. For this purpose, piston cylinder units are usually used. The pressure is up to 800 bar. In a tensioning process, as in US 4,246,810 is described, a bolt is stretched by means of an axial biasing force, so that the seated on the bolt nut can be easily rotated. Tensioning processes work with a hydraulic high pressure of up to 2000 bar. Both systems require hydraulic power units that generate the corresponding pressures. Therefore, dedicated pressure feed units are used for each of the two bolting procedures.

Eine hydraulische Versorgungseinheit mit einem Druckerzeuger und einem Druckverstärker für eine Hochdruckanwendung ist beschrieben in DE 102 49 524 B4 . Der Druckverstärker ist in Verlängerung des Druckerzeugers und in einem gemeinsamen Gehäuse mit dem Druckerzeuger angeordnet. Folglich muss stets die gesamte Einheit mitgeführt werden.A hydraulic supply unit with a pressure generator and a pressure booster for a high pressure application is described in DE 102 49 524 B4 , The pressure booster is in extension of the pressure generator and in one common housing arranged with the pressure generator. Consequently, the entire unit must always be carried along.

Die AT 008 986 U1 zeigt eine Druckliefereinheit gemäß dem Oberbegriff von Anspruch 1.The AT 008 986 U1 shows a pressure-supply unit according to the preamble of claim 1.

Der Erfindung liegt die Aufgabe zugrunde, eine hydraulische Druckliefereinheit zu schaffen, die imstande ist, einen Lieferdruck für das Schraubverfahren oder einen Hochdruck für eine Hochdruckanwendung wählbar zu liefern.It is an object of the present invention to provide a hydraulic pressure supply unit capable of selectively delivering a delivery pressure for the screwing process or a high pressure for a high pressure application.

Die erfindungsgemäße Druckliefereinheit ist durch den Patentanspruch 1 definiert. Sie ist dadurch gekennzeichnet, dass ein Druckverstärker vorgesehen ist, der einen ersten Kolbenteil größeren Durchmessers und einen zweiten Kolbenteil kleineren Durchmessers aufweist, wobei der erste Kolbenteil von den Drücken des ersten und des zweiten Anschlusses alternierend gesteuert ist und der zweite Kolbenteil an einem Hochdruckanschluss einen Hochdruck erzeugt, der größer ist als der Lieferdruck, wobei an den Hochdruckanschluss eine Hochdruckvorrichtung anschließbar ist.The pressure supply unit according to the invention is defined by the patent claim 1. It is characterized in that a pressure booster is provided which has a first piston part of larger diameter and a second piston part of smaller diameter, wherein the first piston part of the pressures of the first and the second port is controlled alternately and the second piston part at a high pressure port a high pressure generated, which is greater than the delivery pressure, wherein a high pressure device is connected to the high pressure port.

Die Erfindung bietet den Vorteil, dass dieselbe hydraulische Druckliefereinheit für das Schraubverfahren und eine Hochdruckanwendung, z. B. das Spannverfahren, verwendbar ist. Für das Spannverfahren wird lediglich zusätzlich der Druckverstärker eingesetzt, der beim Schraubverfahren inaktiv ist. Der Benutzer braucht also nur ein einziges Gerät anzuschaffen, das für jedes der beiden Schraubverfahren geeignet ist, also für einen Schraubendrehantrieb oder für eine Spannvorrichtung benutzt werden kann. Bei einem Betrieb mit Druckverstärker erfolgt die Umsteuerung des Kolbens des Druckverstärkers durch dieselbe Hubsteuereinrichtung, die auch die Hubsteuerung für den Schraubbetrieb durchführt. Es ist also keine zusätzliche Hubsteuereinrichtung für den Druckverstärker erforderlich. Dies hat zur Folge, dass der Druckverstärker aus einem relativ einfachen und kostengünstigen Teil ohne eigene Steuerung bestehen kann.The invention offers the advantage that the same hydraulic pressure supply unit for the screwing and a high-pressure application, for. B. the clamping method, is usable. For the tensioning process, only the pressure booster is additionally used, which is inactive during the screwing process. The user therefore only needs to purchase a single device which is suitable for each of the two screwing methods, that is to say can be used for a screwdriving drive or for a clamping device. In an operation with pressure booster, the reversal of the piston of the pressure booster is carried out by the same stroke control device, which also performs the stroke control for the screwing operation. So there is no additional Hubsteuereinrichtung for the pressure intensifier required. This has the consequence that the pressure booster can consist of a relatively simple and inexpensive part without own control.

Mit der erfindungsgemäßen Druckliefereinheit hat der Anwender die Möglichkeit, dasselbe Gerät für beide Verschraubungsverfahren einzusetzen. Hierdurch werden für den Anwender die Gerätekosten verringert. Der zusätzliche Druckverstärker kommt ohne eigene Hubsteuervorrichtung für den alternierend bewegten Verstärkerkolben aus. Die erfindungsgemäße Druckliefereinheit ist von kompakter Bauweise, geringem Gewicht und besteht aus wenig Bauteilen. Mit dem erfindungsgemäßen System können eine oder mehrere hydraulische Arbeitsvorrichtungen gleichzeitig betrieben werden.With the pressure supply unit according to the invention, the user has the opportunity to use the same device for both Verschraubungsverfahren. As a result, the device costs are reduced for the user. The additional pressure booster does not need its own stroke control device for the alternately moving booster piston. The pressure supply unit according to the invention is of compact design, low weight and consists of few components. With the system according to the invention, one or more hydraulic working devices can be operated simultaneously.

Vorzugsweise ist der Druckverstärker in einem separaten Modul enthalten, das an dem Druckerzeugungsaggregat abnehmbar befestigt ist. Der Druckverstärker bildet ein Zusatzteil, das wahlweise montiert werden kann, wenn die Druckliefereinheit für eine Spannvorrichtung benutzt werden soll. Das Druckverstärker-Modul enthält keine eigene Hubsteuereinrichtung, sondern benutzt diejenige des Grundgerätes. Es besteht auch die Möglichkeit, das Druckverstärker-Modul auf unterschiedliche Weise mit dem Grundgerät zu verbinden. Hierzu gehört das direkte Ankuppeln an das Grundgerät, das Verbinden über hydraulische Anschlussstutzen und das Verbinden über längere Schlauch- oder Rohrleitungen, wobei das Druckverstärker-Modul ein selbstständig aufstellbares Gerät ist.Preferably, the pressure intensifier is contained in a separate module which is removably attached to the pressure generating unit. The pressure booster forms an accessory that can be selectively mounted when the pressure supply unit is to be used for a tensioner. The pressure booster module does not contain its own stroke control device, but uses that of the basic device. It is also possible to connect the pressure intensifier module in different ways to the basic unit. This includes the direct coupling to the basic unit, the connection via hydraulic connecting pieces and the connection via longer hose or piping, where the pressure intensifier module is a self-installable unit.

Gemäß einer bevorzugten Ausgestaltung der Erfindung ist vorgesehen, dass die Hubsteuereinrichtung ein Hubschaltventil enthält, welches die Umschaltung des Lieferdrucks zwischen erstem und zweitem Anschluss in Abhängigkeit von der zeitlichen Änderung des Druckes vornimmt. Hierbei kann die Steuerung nach einem derjenigen Verfahren erfolgen, die in WO 03/097304 A1 beschrieben sind. Alternativ oder zusätzlich hierzu ist eine manuelle Betätigung des Hubschaltventils direkt oder über eine Funkverbindung möglich.According to a preferred embodiment of the invention it is provided that the stroke control device includes a Hubschaltventil, which makes the switching of the delivery pressure between the first and second port in response to the change in pressure over time. In this case, the control can take place according to one of the methods described in US Pat WO 03/097304 A1 are described. Alternatively or additionally, a manual actuation of the Hubschaltventils is possible directly or via a radio link.

Die Einstellung des Hochdrucks erfolgt vorteilhafterweise an einem Druckbegrenzungsventil mit welchem der Lieferdruck eingestellt wird. Der Hochdruck unterscheidet sich von dem Lieferdruck durch einen konstruktiv vorgegebenen Faktor. Mit dem Druckbegrenzungsventil kann einerseits bei einem Schraubverfahren der Lieferdruck und andererseits bei einem Spannverfahren der Hochdruck variiert werden. Zur Einstellung beider Drücke ist also nur ein Druckbegrenzungsventil erforderlich.The adjustment of the high pressure is advantageously carried out on a pressure relief valve with which the delivery pressure is set. Of the High pressure differs from the delivery pressure by a structurally specified factor. With the pressure relief valve on the one hand in a screwing the delivery pressure and on the other hand in a tensioning process of the high pressure can be varied. To set both pressures so only one pressure relief valve is required.

An dem Druckverstärker sollte ein Entlastungsventil vorgesehen sein, das manuell zu öffnen ist und im geöffneten Zustand den ersten Anschluss mit dem Hochdruckanschluss verbindet.A relief valve should be provided on the pressure intensifier, which can be opened manually and, when open, connects the first port to the high pressure port.

Eine bevorzugte Ausführungsform der Erfindung weist eine Steuereinheit auf, die bei einem Betrieb der Bolzenspannvorrichtung mit dem Hochdruck die Zahl der Arbeitshübe laufend addiert, um den Ablauf eines Wartungsintervalls zu bestimmen. Hierbei erfolgt eine laufende Zählung der Arbeitshübe. Bei kritischen Komponenten, die mit Hochdruck betrieben werden, ist die verfügbare Einsatzdauer durch eine bestimmte Grenz-Hubzahl begrenzt. Üblicherweise erfolgt die Messung der Hubzahl mit einem mechanischen Zählwerk. Die Erfindung ermöglicht es in einfacher Weise, die Hubzahlzählung ohne zusätzliche Komponenten zu realisieren.A preferred embodiment of the invention has a control unit which continuously adds the number of working strokes during operation of the bolt tensioning device with the high pressure in order to determine the expiration of a maintenance interval. Here, a running count of the strokes is done. For critical components operating at high pressure, the available service life is limited by a certain limit stroke rate. Usually, the measurement of the number of strokes with a mechanical counter. The invention makes it possible in a simple manner to realize the Hubzahlzählung without additional components.

Im Folgenden wird unter Bezugnahme auf die Zeichnungen ein Ausführungsbeispiel der Erfindung näher erläutert.In the following an embodiment of the invention will be explained in more detail with reference to the drawings.

Es zeigen:

Fig.1
ein Hydraulikschaltbild der Druckliefereinheit mit Druckverstärker,
Fig. 2
einen Schnitt durch den Druckverstärker und
Fign. 3, 4, 5
verschiedene Ausführungsformen des Anschließens des Druckverstärkers an das Grundgerät bzw. Druckerzeugungsaggregat der Druckliefereinheit.
Show it:
Fig.1
a hydraulic circuit diagram of the pressure supply unit with pressure booster,
Fig. 2
a section through the pressure booster and
FIGS. 3, 4, 5
various embodiments of connecting the pressure booster to the basic unit or pressure generating unit of the pressure-supply unit.

Gemäß Figur 1 ist ein Druckerzeugungsaggregat 10 vorgesehen, das einen Lieferdruck für einen Kraftschrauber 11 erzeugt, der hier nur durch eine Kolben-Zylinder-Einheit repräsentiert wird. Das Druckerzeugungsaggregat 10 enthält eine Pumpe 12, die von einem Motor 13 angetrieben wird und Hydraulikfluid aus einem Tank 25 pumpt, um einen Druck zu erzeugen. Der Druck wird jeweils einem Eingang eines Schaltventils 14 für Vorlauf und eines Schaltventils 15 für Rücklauf zugeführt. Das Schaltventil 14 weist einen Auslass 14a auf, der mit einem ersten Anschluss 16 verbunden ist. Das Schaltventil 15 weist einen ersten Auslass 15a auf, der mit einem zweiten Anschluss 17 verbunden ist. Die Anschlüsse 16 und 17 sind Kupplungen zum hydraulischen Ankuppeln des Kraftschraubers 11. Die Steuerung der Schaltventile 14 und 15 erfolgt durch jeweils einen Steuerzylinder 14b, 15b. Der Steuerzylinder 14b wird durch den Druck am Auslass 15a gesteuert. Der Steuerzylinder 15b wird von einem Hubschaltventil 20 gesteuert, bei dem es sich um ein Magnetventil handelt, das in Abhängigkeit von den Signalen einer Steuereinheit betätigt wird. Das Hubsteuerventil verbindet in einer (in Figur 1 dargestellten) ersten Position den Steuerzylinder 15b mit der Rücklaufleitung 26 und in einer zweiten Position den Steuerzylinder 15b mit der Druckleitung 18 der Pumpe 12.According to FIG. 1 a pressure generating unit 10 is provided which generates a delivery pressure for a power wrench 11, which is represented here only by a piston-cylinder unit. The pressure generator 10 includes a pump 12 which is driven by a motor 13 and pumps hydraulic fluid from a tank 25 to create a pressure. The pressure is supplied to each input of a switching valve 14 for flow and a switching valve 15 for return. The switching valve 14 has an outlet 14 a, which is connected to a first port 16. The switching valve 15 has a first outlet 15 a, which is connected to a second port 17. The connections 16 and 17 are couplings for the hydraulic coupling of the power wrench 11. The control of the switching valves 14 and 15 is effected by a respective control cylinder 14b, 15b. The control cylinder 14b is controlled by the pressure at the outlet 15a. The control cylinder 15b is controlled by a lift control valve 20, which is a solenoid valve operated in response to the signals of a control unit. The stroke control valve connects in a (in FIG. 1 shown) first position the control cylinder 15b with the return line 26 and in a second position the control cylinder 15b with the pressure line 18 of the pump 12th

Der Auslass 15a des Schaltventils 15 ist über ein Druckbegrenzungsventil 21 für den Rückdruck, das auf 100 bar eingestellt ist, mit der Rücklaufleitung 26 verbunden. Der Auslass 14a des Schaltventils 14 ist über ein einstellbares Druckbegrenzungsventil 24, das zwischen 0 und 800 bar einstellbar ist, mit einem weiteren Rücklauf 26a verbunden. Das Druckbegrenzungsventil 24 erzeugt den Lieferdruck PL, der dem Anschluss 16 zugeführt wird. Am Anschluss 17 wird der Rücklaufdruck PR erzeugt, der von dem Druckbegrenzungsventil 21 begrenzt wird.The outlet 15 a of the switching valve 15 is connected to the return line 26 via a pressure relief valve 21 for the back pressure, which is set to 100 bar. The outlet 14a of the switching valve 14 is connected via an adjustable pressure relief valve 24, which is adjustable between 0 and 800 bar, with another return 26a. The pressure limiting valve 24 generates the delivery pressure PL, which is supplied to the terminal 16. At the port 17, the return pressure PR is generated, which is limited by the pressure limiting valve 21.

In der ersten Stellung des Hubschaltventils 20 ist dessen Anschluss A mit dem Rücklaufanschluss R verbunden, während der Anschluss P gesperrt ist. In diesem Zustand ist der Anschluss 16 des Druckerzeugungsaggregates 10 drucklos und der Anschluss 17 wird mit Druck beaufschlagt. In der zweiten Stellung des Hubschaltventils 20 sind die Anschlüsse P und A miteinander verbunden, während der Anschluss R abgesperrt ist. In diesem Zustand ist der Anschluss 17 mit dem Tank verbunden und der Anschluss 16 ist mit Druck beaufschlagt.In the first position of Hubschaltventils 20 whose port A is connected to the return port R, while the port P is locked. In this state, the port 16 of the pressure generating unit 10 is depressurized and the port 17 is pressurized. In the second position of Hubschaltventils 20, the terminals P and A are connected to each other, while the terminal R is shut off. In this state, the port 17 is connected to the tank and the port 16 is pressurized.

Der Anschluss 17 ist mit einem Druckwandler 22 und der Anschluss 16 ist mit einem Druckwandler 23 verbunden. Die elektrischen Signale, die den Drücken entsprechen, werden der Steuereinheit zugeführt, die in Abhängigkeit hiervon das Hubschaltventil 20 steuert. Die Steuerung des Kraftschraubers 11 erfolgt in Abhängigkeit von den Drücken der Druckwandler 22 und 23 in der Weise, wie in WO 03/097304 A1 beschrieben, die durch Verweisung in die vorliegende Beschreibung einbezogen wird.The port 17 is connected to a pressure transducer 22 and the port 16 is connected to a pressure transducer 23. The electrical signals corresponding to the pressures are supplied to the control unit, which controls the lift switching valve 20 in response thereto. The control of the power wrench 11 is effected in response to the pressures of the pressure transducers 22 and 23 in the manner as in FIG WO 03/097304 A1 which is incorporated by reference into the present specification.

Das bisher beschriebene Druckerzeugungsaggregat 10 ist bekannt. Erfindungsgemäß ist ein Druckverstärker 30 vorgesehen, der in einem separaten Modul 31 enthalten ist. Das Modul 31 weist einen Hochdruckanschluss 32 auf, an den ein Hochdruckgerät, hier eine Spannzylindereinheit 33, anschließbar ist. Die Spannzylindereinheit 33 wird mit einem Druck betrieben, der erheblich größer ist als derjenige des Kraftschraubers 11. Aus diesem Grund wird der Hochdruck PH durch den Druckverstärker 30 erzeugt. Während der Lieferdruck PL von 0 bis 800 bar variiert, kann der Hochdruck PH bis zu 2000 bar betragen. Zur Begrenzung des Hochdrucks PH dient ein Druckbegrenzungsventil 34. Ein manuell zu betätigendes Entriegelungsventil 35 dient dazu, den Hochdruckanschluss 32 zu entlasten, um den Spannzylinder drucklos zu machen.The pressure generating unit 10 described so far is known. According to the invention, a pressure booster 30 is provided, which is contained in a separate module 31. The module 31 has a high pressure port 32, to which a high pressure device, here a clamping cylinder unit 33, can be connected. The clamping cylinder unit 33 is operated at a pressure which is considerably greater than that of the power wrench 11. For this reason, the high pressure PH is generated by the pressure booster 30. While the supply pressure PL varies from 0 to 800 bar, the high pressure PH can be up to 2000 bar. To limit the high pressure PH is a pressure relief valve 34. A manually operated unlocking valve 35 serves to relieve the high pressure port 32 to depressurize the clamping cylinder.

Der Druckverstärker 30 weist einen Anschluss D auf, der mit dem Anschluss 16 des Druckerzeugungsaggregats verbunden ist und einen Anschluss E, der mit dem Anschluss 17 des Druckerzeugungsaggregats verbunden ist. An den Anschlüssen E und D wird wechselseitig der Lieferdruck PL erzeugt, während der jeweils andere Anschluss mit dem Rücklauf verbunden ist.The pressure booster 30 has a port D which is connected to the port 16 of the pressure generating unit and a port E which is connected to the port 17 of the pressure generating unit. To the Ports E and D are alternately the supply pressure PL generated while the other port is connected to the return.

Das Druckerzeugungsaggregat 10 enthält ein Manometer 25, das den Lieferdruck anzeigt. Das Modul 31 enthält ein Manometer 36, das den Hochdruck anzeigt.The pressure generating unit 10 includes a pressure gauge 25, which indicates the delivery pressure. The module 31 includes a pressure gauge 36 indicative of high pressure.

Das Modul 31 mit dem Druckverstärker 30 ist in Figur 2 dargestellt. Das Modul weist einen Block 40 auf, der einen Zylinder 41 mit einem darin verschiebbaren Verstärkerkolben 42 enthält. Der Zylinder 41 hat eine große Zylinderbohrung 43 und eine daran anschließende kleine Zylinderbohrung 44. Der Verstärkerkolben 42 hat einen ersten Kolbenteil 45 großen Durchmessers und einen zweiten Kolbenteil 46 kleinen Durchmessers. Die Kolbenfläche des ersten Kolbenteils 45 ist F1 und die Kolbenfläche des zweiten Kolbenteils 46 ist F2. Die Flächen F1 und F2 stehen im Verhältnis 3:1. Der Zylinderraum, der durch die Kolbenfläche F1 begrenzt wird, ist mit dem Anschluss D verbunden. Der Rückraum 47 ist mit dem Anschluss E verbunden. Die kleine Kolbenfläche F2 begrenzt einen Hochdruckraum 48, der über ein Rückschlagventil 49 mit dem Hochdruckanschluss 32 verbunden ist. Durch den Verstärkerkolben 42 erstreckt sich eine längslaufende Bohrung, die ein Rückschlagventil 50 enthält. Dadurch gelangt der Lieferdruck, der auf die Kolbenfläche F1 wirkt, auf die Hochdruckseite des Kolbens. In Folge des Flächenverhältnisses F1:F2 entsteht in dem Hochdruckraum 48 ein erhöhter Druck. Durch alternierende Bewegung des Verstärkerkolbens 42 wird der Lieferdruck auf die Größe des Hochdrucks verstärkt.The module 31 with the pressure amplifier 30 is in FIG. 2 shown. The module has a block 40 which contains a cylinder 41 with a booster piston 42 displaceable therein. The cylinder 41 has a large cylinder bore 43 and an adjoining small cylinder bore 44. The booster piston 42 has a first piston part 45 of large diameter and a second piston part 46 of small diameter. The piston area of the first piston part 45 is F1 and the piston area of the second piston part 46 is F2. The areas F1 and F2 are in the ratio 3: 1. The cylinder space bounded by the piston surface F1 is connected to the port D. The rear space 47 is connected to the terminal E. The small piston surface F2 defines a high pressure chamber 48, which is connected via a check valve 49 to the high pressure port 32. By the booster piston 42 extends a longitudinal bore containing a check valve 50. As a result, the delivery pressure, which acts on the piston surface F1, reaches the high-pressure side of the piston. As a result of the area ratio F1: F2 arises in the high-pressure chamber 48, an increased pressure. By alternating movement of the booster piston 42, the delivery pressure is increased to the magnitude of the high pressure.

Ein Entlastungsventil 52, das mit einem Handgriff 53 zu betätigen ist, dient dazu, den Hochdruck von der Spannzylindereinheit 33 zu entfernen, um diesen zu entlasten. Das Entlastungsventil 52 weist eine federgespannte Kugel auf, die gegen einen Ventilsitz gedrückt wird und von einem Stift 54 des Handgriffs von dem Ventilsitz entfernt werden kann. Im geöffneten Zustand verbindet das Entlastungsventil 52 den Anschluss D mit dem Hochdruckanschluss 32, so dass dieser zum Rücklauf hin entlastet wird.A relief valve 52, which is to be operated with a handle 53, serves to remove the high pressure from the clamping cylinder unit 33, to relieve this. The relief valve 52 includes a spring-loaded ball which is urged against a valve seat and can be removed from the valve seat by a pin 54 of the handle. When open, this connects Relief valve 52 the port D to the high pressure port 32 so that it is relieved to the return.

Das Druckerzeugungsaggregat 10 wird nur in Verbindung mit einem Kraftschrauber 11 oder mit einer Spannzylindereinheit 33 benutzt, nicht aber mit beiden zusammen. An die Anschlüsse 16, 17 ist also entweder der Kraftschrauber 11 angeschlossen oder das Modul 31. Wenn das Modul 31 angeschlossen ist, erfolgt die Hubsteuerung des Kolbens 42 des Druckverstärkers 30 durch das Hubschaltventil 20 in gleicher Steuerung wie bei dem Kraftschrauberbetrieb.The pressure generating unit 10 is used only in conjunction with a power wrench 11 or with a clamping cylinder unit 33, but not with both together. Thus, either the power wrench 11 is connected to the connections 16, 17 or the module 31. When the module 31 is connected, the stroke control of the piston 42 of the pressure booster 30 takes place through the lift switching valve 20 in the same control as in the power wrench operation.

Die Figuren 3, 4 und 5 zeigen unterschiedliche Varianten der Anbringung des Moduls 31 an dem Druckerzeugungsaggregat. Das Druckerzeugungsaggregat weist ein Gehäuse 60 auf, das die Pumpe 12 und den Motor 13 enthält. Dieses Gehäuse ist an einem stirnseitigen Ende durch einen Verteilerblock 61 abgeschlossen, welcher die in Figur 1 dargestellte Ventilanordnung trägt. Der Verteilerblock trägt auch das Manometer 25. Von außen zugänglich ist am Verteilerblock das Druckbegrenzungsventil 24 zur Verstellung des Lieferdrucks PL und somit auch des Hochdrucks PH. Der Verteilerblock weist stirnseitig die Anschlüsse 16 und 17 auf, an die wahlweise ein Kraftschrauber oder ein Modul 31 angeschlossen werden kann. Die Anschlüsse 16 und 17 können doppelt vorgesehen sein, wobei jeweils die nichtbenutzten Anschlüsse verschlossen sind.The FIGS. 3, 4 and 5 show different variants of the attachment of the module 31 to the pressure generating unit. The pressure generating unit has a housing 60 containing the pump 12 and the motor 13. This housing is closed at a front end by a distributor block 61, which the in FIG. 1 illustrated valve assembly carries. The distribution block also carries the manometer 25. From the outside is accessible to the manifold block, the pressure relief valve 24 for adjusting the delivery pressure PL and thus also the high pressure PH. The distribution block has the front side of the terminals 16 and 17, to which either a power wrench or a module 31 can be connected. The terminals 16 and 17 may be provided in duplicate, each unused ports are closed.

Das Modul 31 weist das Entlastungsventil 52 auf, dessen Handgriff von außen zugänglich ist. Außerdem ist der Hochdruckanschluss 32 erkennbar.The module 31 has the relief valve 52, the handle is accessible from the outside. In addition, the high-pressure port 32 can be seen.

Auf dem Gehäuse 60 ist ein Aufsatz 62 befestigt, der die elektronische Steuereinheit 63 enthält, welche die Hubsteuereinrichtung mit dem Hubschaltventil 20 steuert. Die Steuereinheit 63 empfängt u. a. die Signale der Drucksensoren 22 und bei Betrieb der Druckliefereinheit mit einem Spannzylinder liefert sie auch eine Angabe über die Zahl der durchgeführten Arbeitshübe.Mounted on the housing 60 is an attachment 62 which contains the electronic control unit 63 which controls the lift control device with the lift control valve 20. The control unit 63 receives inter alia the signals of the pressure sensors 22 and when operating the pressure supply unit with a clamping cylinder, it also provides an indication of the number of strokes carried out.

Die Figuren 3 - 5 zeigen unterschiedliche Arten der Anbringung des Moduls 31 an dem Verteilerblock 61 durch direkten Anschluss oder mit Schläuchen 64.The Figures 3 - 5 show different ways of attaching the module 31 to the manifold block 61 by direct connection or with hoses 64.

Claims (6)

  1. A hydraulic pressure supply unit for a power screwdriver (11), said hydraulic pressure supply unit comprising
    - a pressure generating aggregate (10) generating a supply pressure (PL),
    - a stroke control unit for supplying the supply pressure alternately to a first connector (16) and a second connector (17) and for connecting the respective other one of said two connectors to a return line (26),
    characterized in
    that a pressure intensifier (30) is provided which comprises a first piston member (45) having a larger diameter and a second piston member (46) having a smaller diameter, said first piston member being alternately controlled by the pressures of said first and second connectors (16,17), and said second piston member (46) generating, at a high-pressure connector (32), a high pressure (PH) which is higher than said supply pressure (PL), said high-pressure connector (32) being adapted for connection of a high-pressure device (33) thereto.
  2. The hydraulic pressure supply unit according to claim 1, characterized in that said pressure intensifier (30) is included in a separate module (31) which is removably attached to said pressure generating aggregate (10).
  3. The hydraulic pressure supply unit according to claim 1 or 2, characterized in that said stroke control unit includes a stroke switch valve (20) for switching the supply pressure (PL) between said first and second connectors (16,17) in dependence on the change of the pressure over time.
  4. The hydraulic pressure supply unit according to any one of claims 1 - 3, characterized in that a settable pressure limiting valve (24) is provided for setting the supply pressure (PL) and thereby also the high pressure (PH).
  5. The hydraulic pressure supply unit according to any one of claims 1 - 4, characterized in that a relief valve (52) is provided which can be opened manually and in the opened state connects the first connector (17) to the high-pressure connector (32).
  6. The hydraulic pressure supply unit according to any one of claims 1 - 5, characterized in that a control unit (63) is provided which, in operation of the bolt tensioning device (33) with the high pressure (PH), continuously adds up the number of the working strokes for detecting the lapse of a maintenance interval.
EP09719703A 2008-03-12 2009-03-11 Hydraulic pressure supply unit for a power screwdriver Active EP2249994B1 (en)

Priority Applications (1)

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DE202008003500U DE202008003500U1 (en) 2008-03-12 2008-03-12 Hydraulic pressure unit for a power screwdriver
PCT/EP2009/052850 WO2009112517A1 (en) 2008-03-12 2009-03-11 Hydraulic pressure supply unit for a power screwdriver

Publications (2)

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EP2249994A1 EP2249994A1 (en) 2010-11-17
EP2249994B1 true EP2249994B1 (en) 2012-06-27

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US (1) US8667789B2 (en)
EP (1) EP2249994B1 (en)
DE (1) DE202008003500U1 (en)
DK (1) DK2249994T3 (en)
ES (1) ES2388991T3 (en)
PL (1) PL2249994T3 (en)
WO (1) WO2009112517A1 (en)

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US20110005221A1 (en) 2011-01-13
WO2009112517A1 (en) 2009-09-17
ES2388991T3 (en) 2012-10-22
DK2249994T3 (en) 2012-08-27
PL2249994T3 (en) 2012-12-31
US8667789B2 (en) 2014-03-11
EP2249994A1 (en) 2010-11-17
DE202008003500U1 (en) 2009-07-30

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