EP3409950B1 - Pneumatic unit for a hydropneumatic pressure booster - Google Patents

Pneumatic unit for a hydropneumatic pressure booster Download PDF

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Publication number
EP3409950B1
EP3409950B1 EP18174122.4A EP18174122A EP3409950B1 EP 3409950 B1 EP3409950 B1 EP 3409950B1 EP 18174122 A EP18174122 A EP 18174122A EP 3409950 B1 EP3409950 B1 EP 3409950B1
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EP
European Patent Office
Prior art keywords
compressed air
pressure
pneumatic unit
switch
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18174122.4A
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German (de)
French (fr)
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EP3409950A1 (en
Inventor
Torsten Kreischer
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.)
TKR Spezialwerkzeuge GmbH
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TKR Spezialwerkzeuge GmbH
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Publication of EP3409950A1 publication Critical patent/EP3409950A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/027—Installations or systems with accumulators having accumulator charging devices
    • 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
    • F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
    • F15B11/064—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam with devices for saving the compressible medium
    • 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
    • F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
    • F15B11/072—Combined pneumatic-hydraulic systems
    • F15B11/0725—Combined pneumatic-hydraulic systems with the driving energy being derived from a pneumatic system, a subsequent hydraulic system displacing or controlling the output element
    • 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/004—Fluid pressure supply failure
    • 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
    • F15B3/00—Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids
    • 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
    • B21J15/22—Drives for riveting machines; Transmission means therefor operated by both hydraulic or liquid pressure and gas pressure
    • 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
    • F15B2211/205—Systems with pumps
    • F15B2211/20507—Type of prime mover
    • F15B2211/20515—Electric motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • 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
    • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
    • 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
    • F15B2211/214—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being hydrotransformers
    • 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
    • F15B2211/216—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being pneumatic-to-hydraulic 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
    • F15B2211/265—Control of multiple pressure sources
    • F15B2211/2654—Control of multiple pressure sources one or more pressure sources having priority
    • 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
    • F15B2211/30505—Non-return valves, i.e. check 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
    • F15B2211/3052—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
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/31523—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member
    • F15B2211/31535—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member having multiple pressure sources and a single output member
    • 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
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6057—Load sensing circuits having valve means between output member and the load sensing circuit using directional control 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/625—Accumulators
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6309—Electronic controllers using input signals representing a pressure the pressure being a pressure source supply pressure
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/665—Methods of control using electronic components
    • F15B2211/6652—Control of the pressure source, e.g. control of the swash plate angle
    • 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
    • F15B2211/775—Combined control, e.g. control of speed and force for providing a high speed approach stroke with low force followed by a low speed working stroke with high force, e.g. for a hydraulic press
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/857—Monitoring of fluid pressure systems
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/863—Control during or prevention of abnormal conditions the abnormal condition being a hydraulic or pneumatic failure
    • F15B2211/8633—Pressure source supply failure
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/875—Control measures for coping with failures
    • F15B2211/8752—Emergency operation mode, e.g. fail-safe operation mode
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/875—Control measures for coping with failures
    • F15B2211/8757—Control measures for coping with failures using redundant components or assemblies
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/885—Control specific to the type of fluid, e.g. specific to magnetorheological fluid
    • F15B2211/8855—Compressible fluids, e.g. specific to pneumatics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/85978—With pump
    • Y10T137/86171—With pump bypass
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87265—Dividing into parallel flow paths with recombining
    • Y10T137/87338—Flow passage with bypass

Definitions

  • the invention relates to a pneumatic unit for a hydropneumatic pressure booster.
  • Hydropneumatic pressure booster are known in various configurations from the prior art. Such devices are used for example for driving hydraulically driven hydraulic tools, which u.a. used for punching, riveting, clinching or joining.
  • a pneumatic low pressure in the range of for example 2 to 10 bar in hydraulic high pressure of 100 to 600 bar can be converted. This hydraulic pressure can be used to drive working pistons of hydraulic tools that can be connected to the pressure intensifier.
  • Pressure intensifiers of the type mentioned above come u.a. used in motor vehicle workshops, where they are used, for example, to drive punching and riveting, which are used in the vehicle repair.
  • a supply of the pressure booster takes place via the usually present in motor vehicle workshops compressed air lines which can be coupled directly to the pressure booster. With a consistently high pneumatic pressure, reliable operation of the pressure booster and of a hydraulic tool connected to the pressure booster can then be ensured.
  • a known pneumatic unit is from the DE 102 42 547 B4 disclosed.
  • the invention is based on the object to provide a pneumatic unit that provides the pressure intensifier a sufficiently high pneumatic pressure for the implementation of at least one operation of the connected hydraulic tool even with a pressure drop or pressure drop in the supplying pneumatic line.
  • a pneumatic unit is understood to mean a device which is designed for the temporary supply of a hydraulic pressure booster with pneumatic pressure, thereby enabling at least one operation of a hydraulic tool connected to the hydraulic pressure booster.
  • the device according to the invention is preferably used in such a way that it is interposed between a supplying pneumatic line and the hydraulic pressure booster.
  • the compressed air inlet is the pneumatic unit according to the invention with an external Compressed air source connectable.
  • the compressed air inlet allows the connection of the pneumatic unit to a commonly available central compressed air supply.
  • the compressed air outlet then serves to connect a compressed air consumer, in particular a hydropneumatic pressure booster.
  • the compressed air flowing into the pneumatic unit is first used to charge the accumulator.
  • the compressed air flows via the first compressed air switch into the bypass line and into the pressure intensifier arranged there.
  • the pressure intensifier increases, for example, doubles the input pressure of the compressed air flowing in via the compressed air inlet, which is then stored in the compressed air storage.
  • the size of the compressed air reservoir is freely selectable depending on the amount of compressed air to be provided in the event of a compressed air failure.
  • the compressed air reservoir is dimensioned such that the storable air quantity is at least sufficient to perform a complete operation with a hydraulic tool connected to the pressure booster.
  • a pressing tool an operation on the complete extension of the working piston of the tool, the building of the maximum pressure and the complete retraction of the working piston.
  • the second compressed air switch is switched to a second switching state, in which the compressed air flow from the compressed air inlet blocked and the compressed air flow is released from the compressed air reservoir.
  • at least one operation can then be performed or completed using the storage air in the pressure accumulator.
  • the pneumatic unit according to the invention thus ensures, in particular in the case of a pressure intensifier connected to the compressed air outlet, with a hydraulic tool operated by the latter, that a complete working process with the required operating parameters can be concluded therewith.
  • a pressure intensifier connected to the compressed air outlet
  • a hydraulic tool operated by the latter that a complete working process with the required operating parameters can be concluded therewith.
  • a switching of the second compressed-air switch between the first and second switching state can in principle take place in any desired manner. So this can be adjusted, for example, by a manually operated by the tool user actuator, such as a foot switch or a hand lever if necessary. Any required pressure reduction of the compressed air provided by the compressed air reservoir can be made by pressure reducer to the downstream tools or the pressure booster.
  • the second compressed-air switch is formed as an OR valve and in the region between the compressed air reservoir and the OR valve, a pressure control valve is arranged.
  • the compressed air accumulator is followed by a pressure regulating valve which reduces the compressed air provided by the compressed air accumulator to a value just below the value of the compressed air at the compressed air inlet, which then rests against the compressed air switch formed as an OR valve.
  • the OR valve In normal operation, the OR valve is arranged in the first switching state in which compressed air flow is blocked by the pressure-reduced compressed air reservoir. If the compressed air flow in the system line at the or-valve falls below the pressure required for normal operation, then the or-valve automatically switches to the second switching state, in which the pressure-reduced compressed air flow adapted to the pressure in normal operation is released from the compressed-air accumulator and shuts off the system line from the compressed-air inlet to the or-valve.
  • This embodiment of the invention eliminates a manual operation of the second compressed-air switch. A malfunctioning reduction of the compressed air flow at the compressed air inlet is automatically detected, so that an error-prone recognition by the tool user can be dispensed with. Faulty work processes is thus prevented in a particularly reliable manner.
  • a pressure booster is supplied by the pneumatic unit with the required operating pressure with compressed air, if this is sufficiently high, is provided according to a further embodiment of the invention that in the area between the compressed air outlet and the second compressed air switch an adjustable, pressure-dependent shut-off valve is arranged.
  • the check valve which is usually set to the compressed air pressure provided at the compressed air inlet, ensures that the pneumatic unit supplies compressed air at the compressed air outlet only if it does not fall below the required operating pressure. If there is no sufficiently high operating pressure, either after the pneumatic unit has been connected until the air reservoir has been filled or after the air reservoir has been emptied, then the shut-off valve shuts off the system line after the second compressed air switch and blocks the working process of subsequent tools or of the pressure booster.
  • the control of the check valve is carried out according to a particularly advantageous embodiment of the invention via an in the area between the second pressure switch and the check valve connected to the system line pressure switch.
  • the information relating to the compressed air flow relates to the direction of the compressed air flow through the pneumatic unit, such as "behind" or "to” and "forward".
  • the pressure switch is connected to a 3/2 way valve, which is connected to control the valve designed as a 5/2 way valve with this.
  • This embodiment of Invention is characterized by a particularly reliable shut-off of the system line in the area behind the second pressure switch, when the pressure in the system line falls below the value set at the pressure switch.
  • the pneumatic unit according to the invention increases the process reliability of a connected tool, after a temporary supply of compressed air in the event of a fault is ensured via the compressed-air accumulator.
  • Essential for the reliability is also the detection of the fault by the tool operator, the fault display basically in any way, for example. By suitable sensors that are connected to corresponding displays, can take place.
  • a compressed air generator is arranged in the region between the compressed air reservoir and the second compressed air switch.
  • Characteristic of the compressed air generator is that it generates electrical energy when flowing through. This happens, for example, by a driven by the compressed air flow generator. The electrical energy can then be used to operate any, electrically operated functional component, for example a display device.
  • An arrangement of the compressed air generator between the compressed air reservoir and the second compressed-air switch, preferably between the advantageously provided pressure regulator and the second pressure switch, during operation means that the compressed-air generator is only flowed through and generates electrical energy when compressed air flows from the compressed air reservoir to the compressed-air outlet.
  • An activation of the compressed air generator thus takes place only in the event of a fault, so that the compressed air generator operates as a sensor which optionally also serves to power a display unit, which signals an error to an operator when activated.
  • the configuration of the display unit connected to the compressed air generator is basically freely selectable. According to a particularly advantageous embodiment of the invention, however, it is provided that the compressed air generator is connected to a visually and / or acoustically acting display unit.
  • the optical display unit may be formed by an LED, which in normal operation due to a lack of flow through the compressed air generator is inactive. In the event of a fault, the compressed air generator flows through and activates the LED, which indicates to the operator that the compressed air storage is activated and only a limited number of operations defined by the compressed air storage can be carried out.
  • An acoustic display unit may be formed, for example, by a simple speaker.
  • connection of the compressed air generator with the display unit can basically be done in any manner, in a particularly simple embodiment of the invention, the compressed air generator is connected directly to a arranged on the pneumatic unit display unit. According to a particularly advantageous embodiment of the invention, however, it is provided that the compressed air generator is connected to a connection element for connecting a display unit.
  • connection element is, for example, a plug unit which enables the electrical connection of an external LED.
  • the connection element thus makes it possible to arrange the display unit at any desired location, from where it can be connected to the connection element, for example the plug unit, with suitable electrical lines.
  • connection element for example, an LED arranged on the hydraulic tool can be connected. Activation of the LED, which is deactivated in normal operation, thus directly indicates to the tool operator that the pneumatic unit has switched to a pressure supply through the air storage.
  • the possibility of arranging the display unit directly on the hydraulic tool increases the process reliability in a complementary manner.
  • the structural design of the pneumatic unit is basically arbitrary. According to an advantageous embodiment of the invention, however, this has a support frame with receptacles for the arrangement of the hydropneumatic pressure booster on the pneumatic unit. Adjacent to a pressure booster receptacles make it possible to arrange the pressure intensifier stationary on the pneumatic unit.
  • the pneumatic unit and the pressure booster can thus form a space-saving structural unit.
  • the recordings are formed by trained for receiving feet feet tubes.
  • the use of such trained pipes allows a space-saving, superimposed arrangement of pneumatic unit and pressure booster.
  • the tubes extend - in relation to a position of use - in the vertical direction and are arranged at a distance from each other, that the pressure booster is recorded with its feet in the tubes.
  • a pneumatic unit 1 is shown in a schematic diagram.
  • the pneumatic unit 1 is connected via a compressed air inlet 2 to an external compressed air supply 20, wherein this is usually 6 bar in motor vehicle workshop operation.
  • the incoming via the compressed air inlet 2 in the pneumatic unit 1 compressed air is passed via a compressed air switch 5 in the system line 4 and a bypass line 7.
  • About the bypass line 7 of the compressed air stream enters a pressure booster 9, which doubles the inlet pressure of the compressed air.
  • the pressure amplifier 9 is followed by a compressed air reservoir 8, in which the compressed air provided by the pressure booster 9 is stored.
  • a pressure control valve 10 which reduces the compressed air from the compressed air reservoir 8 to a value just below the voltage applied to the compressed air inlet 2 pressure of the compressed air, in the present example 6 bar. This ensures that adjoining the pressure control valve 10, designed as an OR valve 6 second pressure switch a pressure is applied which is just below the line pressure of the system line 4, which is also connected to the OR valve 6.
  • a pressure switch 12 is further arranged, which is designed so that it at the predetermined line pressure, in this case 6 bar, via a 3/2-way valve 13 as a 5/2-way valve trained check valve 11 switches, so that the system line 4 releases the compressed air flow to the compressed air outlet 3.
  • a pressure booster 18 is arranged in the present exemplary embodiment, which converts the pneumatic pressure into a hydraulic pressure, by means of which a hydraulic tool 19 connected to the pressure booster 18 can be actuated, wherein a display unit in the form of an LED 21 is arranged on the hydraulic tool 19.
  • the OR valve 6 switches to the in Fig. 2 illustrated state in which the compressed air flow is released from the compressed air reservoir 8.
  • the pressure switch 12 behaves as in normal operation and outputs the 3/2-way valve 13 and the 5/2-way valve 11 the compressed air flow to the compressed air outlet 3 free.
  • a compressed air generator 14 is arranged in the bypass line 7, which in the manner of a turbine electrical Electricity generated.
  • the compressed air generator 14 is continuously flowed through and generates electrical energy which is conducted via a line to the arranged on the hydraulic tool 19 LED 21, which then starts to glow.
  • the LED 21 thus signals the tool user that insufficient pressure is available in the system line 4 and that now the pneumatic unit 1 provides compressed air via the compressed air reservoir 8.
  • the tool user can end at least the work process begun (extension of a piston on the hydraulic tool, buildup of the maximum pressure and retraction of the working piston).
  • Fig. 3 and Fig. 4 is the pneumatic unit 1 reproduced in a perspective view.
  • a support frame 15 of the pneumatic unit 1 On a support frame 15 of the pneumatic unit 1, four receptacles formed as tubes 16 are spaced from one another, wherein they are designed such that they can receive the feet 17 of the pressure booster 18, so that the pneumatic unit 1 and the pressure booster 18 form a compact assembly ,
  • the pressure booster 18 serves to supply the hydraulic tool 19 via a hydraulic line, not shown here (see. Fig. 5 ).

Description

Die Erfindung betrifft eine Pneumatikeinheit für einen hydropneumatischen Druckübersetzer.The invention relates to a pneumatic unit for a hydropneumatic pressure booster.

Hydropneumatische Druckübersetzer sind in vielfältigen Ausgestaltungen aus dem Stand der Technik bekannt. Derartige Vorrichtungen dienen beispielsweise zum Antrieb von hydraulisch angetriebenen Hydraulikwerkzeugen, welche u.a. zum Stanzen, Nieten, Clinchen oder Fügen verwendet werden. Durch den Druckübersetzer kann beispielsweise ein pneumatischer Niederdruck im Bereich von beispielsweise 2 bis 10 bar in hydraulischen Hochdruck von 100 bis 600 bar umgewandelt werden. Dieser hydraulische Druck ist zum Antrieb von Arbeitskolben der mit dem Druckübersetzer verbindbaren Hydraulikwerkzeuge nutzbar.Hydropneumatic pressure booster are known in various configurations from the prior art. Such devices are used for example for driving hydraulically driven hydraulic tools, which u.a. used for punching, riveting, clinching or joining. By the pressure booster, for example, a pneumatic low pressure in the range of for example 2 to 10 bar in hydraulic high pressure of 100 to 600 bar can be converted. This hydraulic pressure can be used to drive working pistons of hydraulic tools that can be connected to the pressure intensifier.

Druckübersetzer der eingangs genannten Art kommen u.a. in Kraftfahrzeugwerkstätten zum Einsatz, wo sie bspw. zum Antrieb von Stanz- und Nietgeräten genutzt werden, die bei der Fahrzeugreparatur zum Einsatz kommen. Eine Versorgung der Druckübersetzer erfolgt dabei über die üblicherweise in Kraftfahrzeugwerkstätten vorhandenen Druckluftleitungen, welche direkt mit den Druckübersetzern koppelbar sind. Bei einem gleichbleibend hohen pneumatischen Druck kann dann ein zuverlässiger Betrieb des Druckübersetzers und eines mit dem Druckübersetzer verbundenen Hydraulikwerkzeugs gewährleistet werden.Pressure intensifiers of the type mentioned above come u.a. used in motor vehicle workshops, where they are used, for example, to drive punching and riveting, which are used in the vehicle repair. A supply of the pressure booster takes place via the usually present in motor vehicle workshops compressed air lines which can be coupled directly to the pressure booster. With a consistently high pneumatic pressure, reliable operation of the pressure booster and of a hydraulic tool connected to the pressure booster can then be ensured.

Im Falle eines Druckabfalls in der den Druckübersetzer versorgenden Pneumatikleitung besteht jedoch das Problem, dass der Druckübersetzer dem Hydraulikwerkzeug nicht mehr den erforderlichen hydraulischen Druck zur Verfügung stellen kann, der für die mit dem Hydraulikwerkzeug durchzuführende Arbeit erforderlich ist. Im Falle der Verwendung eines Nietwerkzeugs besteht dann beispielsweise das Problem, dass die zu setzende Niete dann nicht mehr mit der für die Nietverbindung vorgesehenen Kraft gesetzt werden kann, was eine unzuverlässige Nietverbindung zur Folge hat. Bei einem vollständigen Druckabfall kommt es zu einem sofortigen Stillstand, was ebenfalls zur Folge hat, dass der Nietvorgang unvollendet bleibt.However, in the case of a pressure drop in the pneumatic line supplying the pressure booster, there is the problem that the pressure booster can no longer provide the hydraulic tool with the required hydraulic pressure which is required for the work to be carried out with the hydraulic tool. In the case of using a riveting tool, for example, then there is the problem that the rivet to be set can then no longer be set with the force provided for the rivet connection, which results in an unreliable rivet connection. With a complete pressure drop, there is an immediate standstill, which also has the consequence that the riveting process remains unfinished.

Eine bekannte Pneumatikeinheit ist aus der DE 102 42 547 B4 offenbart.A known pneumatic unit is from the DE 102 42 547 B4 disclosed.

Hiervon ausgehend liegt der Erfindung die Aufgabe zu Grunde, eine Pneumatikeinheit bereitzustellen, die auch bei einem Druckabfall oder Druckausfall in der versorgenden Pneumatikleitung dem Druckübersetzer einen ausreichend hohen Pneumatikdruck für die Durchführung zumindest eines Arbeitsgangs des angeschlossenen Hydraulikwerkzeugs zur Verfügung stellt.On this basis, the invention is based on the object to provide a pneumatic unit that provides the pressure intensifier a sufficiently high pneumatic pressure for the implementation of at least one operation of the connected hydraulic tool even with a pressure drop or pressure drop in the supplying pneumatic line.

Die Erfindung löst die Aufgabe durch eine Pneumatikeinheit mit den Merkmalen des Anspruchs 1. Vorteilhafte Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen angegeben.The invention solves the problem by a pneumatic unit having the features of claim 1. Advantageous developments of the invention are specified in the dependent claims.

Im Rahmen der Erfindung wird unter einer Pneumatikeinheit eine Vorrichtung verstanden, welche zur temporären Versorgung eines hydraulischen Druckübersetzers mit Pneumatikdruck ausgebildet ist und dabei zumindest die Durchführung eines Arbeitsgangs eines mit dem hydraulischen Druckübersetzer verbundenen Hydraulikwerkzeugs ermöglicht. Die erfindungsgemäße Vorrichtung wird dabei bevorzugt derart verwendet, dass sie einer versorgenden Pneumatikleitung und dem hydraulischen Druckübersetzer zwischengeschaltet ist.In the context of the invention, a pneumatic unit is understood to mean a device which is designed for the temporary supply of a hydraulic pressure booster with pneumatic pressure, thereby enabling at least one operation of a hydraulic tool connected to the hydraulic pressure booster. The device according to the invention is preferably used in such a way that it is interposed between a supplying pneumatic line and the hydraulic pressure booster.

Wesentlich für die erfindungsgemäße Pneumatikeinheit ist

  • eine von einem Drucklufteingang zu einem Druckluftausgang führende Systemleitung,
  • eine im Bereich zwischen dem Drucklufteingang und Druckluftausgang mit der Systemleitung über eine erste Druckluftweiche und eine zweite Druckluftweiche verbundene, parallel zur Systemleitung verlaufende Bypassleitung,
  • ein in der Bypassleitung angeordneter Druckluftspeicher,
  • ein im Bereich zwischen der ersten Druckluftweiche und dem Druckluftspeicher angeordneter Druckverstärker,
wobei die zweite Druckluftweiche zur Umschaltung des Druckluftstroms zwischen der Systemleitung und der Bypassleitung ausgebildet ist.Essential for the pneumatic unit according to the invention
  • a system line leading from a compressed air inlet to a compressed air outlet,
  • a bypass line connected in the area between the compressed air inlet and the compressed air outlet with the system line via a first compressed air switch and a second compressed air switch, running parallel to the system line;
  • a compressed air reservoir arranged in the bypass line,
  • a pressure booster arranged in the region between the first compressed-air switch and the compressed-air reservoir,
wherein the second compressed air switch is designed to switch the compressed air flow between the system line and the bypass line.

Über den Drucklufteingang ist die erfindungsgemäße Pneumatikeinheit mit einer externen Druckluftquelle verbindbar. Im Falle der Verwendung der Pneumatikeinheit in einer KFZ Werkstatt ermöglicht der Drucklufteingang beispielsweise den Anschluss der Pneumatikeinheit an eine üblicherweise vorhandene zentrale Druckluftversorgung. Der Druckluftausgang dient dann zum Anschluss eines Druckluftverbrauchers, insbesondere eines hydropneumatischen Druckübersetzers.About the compressed air inlet is the pneumatic unit according to the invention with an external Compressed air source connectable. In the case of using the pneumatic unit in a motor vehicle workshop, for example, the compressed air inlet allows the connection of the pneumatic unit to a commonly available central compressed air supply. The compressed air outlet then serves to connect a compressed air consumer, in particular a hydropneumatic pressure booster.

Nach dem Anschluss der Pneumatikeinheit an die Druckversorgung wird die in die Pneumatikeinheit einströmende Druckluft zunächst dazu verwendet, um den Druckspeicher zu befüllen. Die Druckluft strömt dazu über die erste Druckluftweiche in die Bypassleitung und in den dort angeordneten Druckverstärker. Der Druckverstärker erhöht, verdoppelt beispielsweise den Eingangsdruck der über den Drucklufteingang zuströmenden Druckluft, welche dann in dem Druckluftspeicher gespeichert wird.After connecting the pneumatic unit to the pressure supply, the compressed air flowing into the pneumatic unit is first used to charge the accumulator. To do this, the compressed air flows via the first compressed air switch into the bypass line and into the pressure intensifier arranged there. The pressure intensifier increases, for example, doubles the input pressure of the compressed air flowing in via the compressed air inlet, which is then stored in the compressed air storage.

Die Größe des Druckluftspeichers ist dabei in Abhängigkeit von der im Falle eines Druckluftausfalls bereitzustellenden Druckluftmenge frei wählbar. Im Falle der Verwendung der Pneumatikeinheit zum Anschluss an einen hydropneumatischen Druckübersetzer ist der Druckluftspeicher derart dimensioniert, dass die speicherbare Luftmenge zumindest ausreichend ist, um mit einem an den Druckübersetzer angeschlossenen Hydraulikwerkzeug einen vollständigen Arbeitsgang durchführen zu können. Bei einem Presswerkzeug weist ein Arbeitsgang das vollständige Ausfahren des Arbeitskolbens des Werkzeugs, das Aufbauen des Maximaldrucks sowie das vollständige Einfahren des Arbeitskolbens auf.The size of the compressed air reservoir is freely selectable depending on the amount of compressed air to be provided in the event of a compressed air failure. In the case of using the pneumatic unit for connection to a hydropneumatic pressure booster, the compressed air reservoir is dimensioned such that the storable air quantity is at least sufficient to perform a complete operation with a hydraulic tool connected to the pressure booster. In a pressing tool, an operation on the complete extension of the working piston of the tool, the building of the maximum pressure and the complete retraction of the working piston.

Im Normalbetrieb, d.h. wenn an dem Drucklufteingang ein konstanter Betriebsdruck in geforderter Höhe anliegt und der Druckluftspeicher vollständig gefüllt ist, erfolgt eine Durchleitung der Druckluft über die Systemleitung der Pneumatikeinheit von dem Drucklufteingang zum Druckluftausgang, von dem aus ein angeschlossenes Werkzeug, bspw. der Druckübersetzer mit Druckluft versorgt wird. Die zweite Druckluftweiche befindet sich dabei in einem ersten Schaltzustand, in dem der Druckluftstrom vom Drucklufteingang zum Druckluftausgang freigegeben wird, wohingegen der Druckluftstrom aus dem Druckluftspeicher zum Druckluftausgang blockiert ist.In normal operation, i. if at the compressed air inlet, a constant operating pressure at the required level is applied and the compressed air reservoir is completely filled, a passage of the compressed air via the system line of the pneumatic unit from the compressed air inlet to the compressed air outlet, from which a connected tool, eg. The pressure booster is supplied with compressed air. The second compressed air switch is in a first switching state, in which the compressed air flow is released from the compressed air inlet to the compressed air outlet, whereas the compressed air flow is blocked from the compressed air reservoir to the compressed air outlet.

Bei einem Abfall oder Ausfall der an dem Drucklufteingang angeschlossenen Druckluftversorgung kann eine Versorgung des Druckluftausgangs mit Druckluft über eine Aktivierung des Druckluftspeichers erfolgen. Hierzu wird die zweite Druckluftweiche in einen zweiten Schaltzustand umgeschaltet, in dem der Druckluftstrom vom Drucklufteingang blockiert und der Druckluftstrom aus dem Druckluftspeicher freigegeben ist. Somit kann dann unter Verwendung der Speicherluft im Druckspeicher zumindest ein Arbeitsgang durchgeführt bzw. abgeschlossen werden.In the event of a drop or failure of the compressed air supply connected to the compressed air inlet, it is possible to supply the compressed air outlet with compressed air via activation the compressed air storage done. For this purpose, the second compressed air switch is switched to a second switching state, in which the compressed air flow from the compressed air inlet blocked and the compressed air flow is released from the compressed air reservoir. Thus, at least one operation can then be performed or completed using the storage air in the pressure accumulator.

Die erfindungsgemäße Pneumatikeinheit gewährleistet somit insbesondere im Falle eines an dem Druckluftausgang angeschlossenen Druckübersetzers mit einem von diesem betriebenen Hydraulikwerkzeug, dass mit diesem ein vollständiger Arbeitsprozess mit den geforderten Arbeitsparametern abgeschlossen werden kann. Beim Nieten wird somit beispielsweise sichergestellt, dass die Nietverbindung die erforderliche Festigkeit aufweist. Fehlerhaften Verbindungen kann somit zuverlässig vorgebeugt werden.The pneumatic unit according to the invention thus ensures, in particular in the case of a pressure intensifier connected to the compressed air outlet, with a hydraulic tool operated by the latter, that a complete working process with the required operating parameters can be concluded therewith. When riveting thus ensuring, for example, that the riveted joint has the required strength. Faulty connections can thus be reliably prevented.

Ein Umschalten der zweiten Druckluftweiche zwischen dem ersten und zweiten Schaltzustand kann grundsätzlich in beliebiger Weise erfolgen. So kann diese beispielsweise durch ein manuell, durch den Werkzeugnutzer zu betätigendes Betätigungselement, wie ein Fußschalter oder einen Handhebel im Bedarfsfall verstellt werden. Eine ggf. erforderliche Druckreduzierung der durch den Druckluftspeicher bereitgestellten Druckluft kann durch Druckminderer an den nachgeschalteten Werkzeugen bzw. dem Druckübersetzer vorgenommen werden.A switching of the second compressed-air switch between the first and second switching state can in principle take place in any desired manner. So this can be adjusted, for example, by a manually operated by the tool user actuator, such as a foot switch or a hand lever if necessary. Any required pressure reduction of the compressed air provided by the compressed air reservoir can be made by pressure reducer to the downstream tools or the pressure booster.

Nach einer vorteilhaften Weiterbildung der Erfindung ist jedoch vorgesehen, dass die zweite Druckluftweiche als Oder-Ventil ausgebildet und im Bereich zwischen dem Druckluftspeicher und dem Oder-Ventil ein Druckregelventil angeordnet ist. Gemäß dieser Ausgestaltung ist dem Druckluftspeicher ein Druckregelventil nachgeschaltet, das die vom Druckluftspeicher bereitgestellte Druckluft auf einen Wert knapp unter dem Wert der Druckluft am Drucklufteingang reduziert, welcher dann an der als Oder-Ventil ausgebildeten Druckluftweiche anliegt.According to an advantageous embodiment of the invention, however, it is provided that the second compressed-air switch is formed as an OR valve and in the region between the compressed air reservoir and the OR valve, a pressure control valve is arranged. According to this embodiment, the compressed air accumulator is followed by a pressure regulating valve which reduces the compressed air provided by the compressed air accumulator to a value just below the value of the compressed air at the compressed air inlet, which then rests against the compressed air switch formed as an OR valve.

Im Normalbetrieb ist das Oder-Ventil im ersten Schaltzustand angeordnet, in der Druckluftstrom vom druckgeminderten Druckluftspeicher blockiert ist. Unterschreitet der Druckluftstrom in der Systemleitung an dem Oder-Ventil den für den Normalbetrieb erforderlichen Druck, dann schaltete das Oder-Ventil selbsttätig in den zweiten Schaltzustand, in dem der druckreduzierte an den Druck im Normalbetrieb angepasste Druckluftstrom vom Druckluftspeicher freigegeben wird und die Systemleitung vom Drucklufteingang zum Oder-Ventil absperrt.In normal operation, the OR valve is arranged in the first switching state in which compressed air flow is blocked by the pressure-reduced compressed air reservoir. If the compressed air flow in the system line at the or-valve falls below the pressure required for normal operation, then the or-valve automatically switches to the second switching state, in which the pressure-reduced compressed air flow adapted to the pressure in normal operation is released from the compressed-air accumulator and shuts off the system line from the compressed-air inlet to the or-valve.

Durch diese Ausgestaltung der Erfindung entfällt eine manuelle Betätigung der zweiten Druckluftweiche. Eine betriebsstörende Reduzierung des Druckluftstroms am Drucklufteingang wird automatisch erkannt, sodass auf eine fehleranfällige Erkennung durch den Werkzeugnutzer verzichtet werden kann. Fehlerhaften Arbeitsprozessen wird somit in besonders zuverlässiger Weise vorgebeugt.This embodiment of the invention eliminates a manual operation of the second compressed-air switch. A malfunctioning reduction of the compressed air flow at the compressed air inlet is automatically detected, so that an error-prone recognition by the tool user can be dispensed with. Faulty work processes is thus prevented in a particularly reliable manner.

Um in ergänzender Weise sicherzustellen, dass ein an die Pneumatikeinheit angeschlossenes Werkzeug, insbesondere ein Druckübersetzer nur dann von der Pneumatikeinheit mit dem erforderlichen Betriebsdruck mit Druckluft versorgt wird, wenn dieser ausreichend hoch ist, ist nach einer weiteren Ausgestaltung der Erfindung vorgesehen, dass im Bereich zwischen dem Druckluftausgang und der zweiten Druckluftweiche ein einstellbares, druckabhängiges Sperrventil angeordnet ist.To ensure in a complementary manner that a tool connected to the pneumatic unit, in particular a pressure booster is supplied by the pneumatic unit with the required operating pressure with compressed air, if this is sufficiently high, is provided according to a further embodiment of the invention that in the area between the compressed air outlet and the second compressed air switch an adjustable, pressure-dependent shut-off valve is arranged.

Das Sperrventil, das in der Regel auf den an dem Drucklufteingang bereitgestellten Druck der Druckluft eingestellt wird, stellt sicher, dass die Pneumatikeinheit nur dann am Druckluftausgang Druckluft bereitstellt, wenn diese nicht den notwendigen Betriebsdruck unterschreitet. Liegt kein ausreichend hoher Betriebsdruck vor, sei es nach dem Anschließen der Pneumatikeinheit bis der Luftspeicher befüllt ist oder nach einer Entleerung des Luftspeichers, dann sperrt das Sperrventil die Systemleitung nach der zweiten Druckluftweiche ab und blockiert den Arbeitsprozess nachfolgender Werkzeuge bzw. des Druckübersetzers. Die Steuerung des Sperrventils erfolgt dabei nach einer besonders vorteilhaften Weiterbildung der Erfindung über einen im Bereich zwischen der zweiten Druckweiche und dem Sperrventil mit der Systemleitung verbundenen Druckschalter. Im Rahmen der Erfindung beziehen sich die auf den Druckluftstrom Bezug nehmenden Angaben wie "hinter" bzw. "nach" sowie "vor" auf die Richtung des Druckluftstroms durch die Pneumatikeinheit.The check valve, which is usually set to the compressed air pressure provided at the compressed air inlet, ensures that the pneumatic unit supplies compressed air at the compressed air outlet only if it does not fall below the required operating pressure. If there is no sufficiently high operating pressure, either after the pneumatic unit has been connected until the air reservoir has been filled or after the air reservoir has been emptied, then the shut-off valve shuts off the system line after the second compressed air switch and blocks the working process of subsequent tools or of the pressure booster. The control of the check valve is carried out according to a particularly advantageous embodiment of the invention via an in the area between the second pressure switch and the check valve connected to the system line pressure switch. In the context of the invention, the information relating to the compressed air flow relates to the direction of the compressed air flow through the pneumatic unit, such as "behind" or "to" and "forward".

Nach einer besonders bevorzugten Weiterbildung der Erfindung ist vorgesehen, dass der Druckschalter mit einem 3/2 Wegeventil verbunden ist, das zur Steuerung des als 5/2 Wegeventil ausgebildeten Sperrventils mit diesem verbunden ist. Diese Ausgestaltung der Erfindung zeichnet sich durch eine besonders zuverlässige Absperrung der Systemleitung im Bereich hinter der zweiten Druckweiche aus, wenn der Druck in der Systemleitung unter den am Druckschalter eingestellten Wert fällt.According to a particularly preferred embodiment of the invention it is provided that the pressure switch is connected to a 3/2 way valve, which is connected to control the valve designed as a 5/2 way valve with this. This embodiment of Invention is characterized by a particularly reliable shut-off of the system line in the area behind the second pressure switch, when the pressure in the system line falls below the value set at the pressure switch.

Die erfindungsgemäße Pneumatikeinheit erhöht aufgrund der Integration des Druckluftspeichers die Prozesssicherheit eines angeschlossenen Werkzeugs, nachdem eine temporäre Druckluftversorgung im Störungsfall über den Druckluftspeicher gewährleistet ist. Wesentlich für die Betriebssicherheit ist dabei auch das Erkennen der Störung durch den Werkzeugbediener, wobei die Störungsanzeige grundsätzlich in beliebiger Weise, bspw. durch geeignete Sensoren, die mit entsprechenden Anzeigen verbunden sind, erfolgen kann.Due to the integration of the compressed-air accumulator, the pneumatic unit according to the invention increases the process reliability of a connected tool, after a temporary supply of compressed air in the event of a fault is ensured via the compressed-air accumulator. Essential for the reliability is also the detection of the fault by the tool operator, the fault display basically in any way, for example. By suitable sensors that are connected to corresponding displays, can take place.

Nach einer Weiterbildung der Erfindung ist jedoch vorgesehen, dass im Bereich zwischen dem Druckluftspeicher und der zweiten Druckluftweiche ein Druckluftgenerator angeordnet ist. Kennzeichnend für den Druckluftgenerator ist, dass dieser beim Durchströmen elektrische Energie erzeugt. Dies geschieht beispielsweise durch ein vom Druckluftstrom angetriebenes Generatorrad. Die elektrische Energie kann dann dazu genutzt werden, um ein beliebiges, elektrisch betriebenes Funktionsbauteil, bspw. eine Anzeigevorrichtung zu betreiben.According to a development of the invention, however, it is provided that a compressed air generator is arranged in the region between the compressed air reservoir and the second compressed air switch. Characteristic of the compressed air generator is that it generates electrical energy when flowing through. This happens, for example, by a driven by the compressed air flow generator. The electrical energy can then be used to operate any, electrically operated functional component, for example a display device.

Eine Anordnung des Druckluftgenerators zwischen dem Druckluftspeicher und der zweiten Druckluftweiche, bevorzugt zwischen dem vorteilhafterweise vorgesehenen Druckregler und der zweiten Druckweiche, führt im Betrieb dazu, dass der Druckluftgenerator nur dann durchströmt wird und elektrische Energie erzeugt, wenn aus dem Druckluftspeicher Druckluft zum Druckluftausgang strömt. Eine Aktivierung des Druckluftgenerators erfolgt also nur im Falle einer Störung, sodass der Druckluftgenerator als Sensor arbeitet der gegebenenfalls auch zur Energieversorgung einer Anzeigeeinheit dient, welche bei ihrer Aktivierung einem Bediener eine Störung signalisiert.An arrangement of the compressed air generator between the compressed air reservoir and the second compressed-air switch, preferably between the advantageously provided pressure regulator and the second pressure switch, during operation means that the compressed-air generator is only flowed through and generates electrical energy when compressed air flows from the compressed air reservoir to the compressed-air outlet. An activation of the compressed air generator thus takes place only in the event of a fault, so that the compressed air generator operates as a sensor which optionally also serves to power a display unit, which signals an error to an operator when activated.

Die Ausgestaltung der mit dem Druckluftgenerator verbundenen Anzeigeeinheit ist grundsätzlich frei wählbar. Nach einer besonders vorteilhaften Weiterbildung der Erfindung ist jedoch vorgesehen, dass der Druckluftgenerator mit einer optisch und/oder akustisch wirkenden Anzeigeeinheit verbunden ist. In ihrer einfachsten Ausgestaltung kann die optische Anzeigeeinheit durch eine LED gebildet sein, welche im Normalbetrieb aufgrund einer mangelnden Durchströmung des Druckluftgenerators inaktiv ist. Im Falle einer Störung wird der Druckluftgenerator durchströmt und aktiviert die LED, was den Bediener darauf hinweist, dass der Druckluftspeicher aktiviert ist und nur noch eine limitierte, durch den Druckluftspeicher festgelegte Anzahl an Arbeitsgängen durchgeführt werden können. Eine akustische Anzeigeeinheit kann beispielsweise durch einen einfachen Lautsprecher gebildet werden.The configuration of the display unit connected to the compressed air generator is basically freely selectable. According to a particularly advantageous embodiment of the invention, however, it is provided that the compressed air generator is connected to a visually and / or acoustically acting display unit. In its simplest embodiment, the optical display unit may be formed by an LED, which in normal operation due to a lack of flow through the compressed air generator is inactive. In the event of a fault, the compressed air generator flows through and activates the LED, which indicates to the operator that the compressed air storage is activated and only a limited number of operations defined by the compressed air storage can be carried out. An acoustic display unit may be formed, for example, by a simple speaker.

Die Verbindung des Druckluftgenerators mit der Anzeigeeinheit kann grundsätzlich in beliebiger Weise erfolgen, wobei in einer besonders einfachen Ausgestaltung der Erfindung der Druckluftgenerator direkt mit einer an der Pneumatikeinheit angeordneten Anzeigeeinheit verbunden ist. Nach einer besonders vorteilhaften Ausgestaltung der Erfindung ist jedoch vorgesehen, dass der Druckluftgenerator mit einem Anschlusselement zum Anschluss einer Anzeigeeinheit verbunden ist.The connection of the compressed air generator with the display unit can basically be done in any manner, in a particularly simple embodiment of the invention, the compressed air generator is connected directly to a arranged on the pneumatic unit display unit. According to a particularly advantageous embodiment of the invention, however, it is provided that the compressed air generator is connected to a connection element for connecting a display unit.

Bei dem Anschlusselement handelt es sich beispielsweise um eine Steckereinheit, die den elektrischen Anschluss einer externen LED ermöglicht. Das Anschlusselement erlaubt es somit, die Anzeigeeinheit an beliebiger Stelle anzuordnen, von wo aus sie mit geeigneten elektrischen Leitungen mit dem Anschlusselement, beispielsweise der Steckereinheit verbunden werden kann. Über das Anschlusselement kann so zum Beispiel eine am Hydraulikwerkzeug angeordnete LED verbunden werden. Eine Aktivierung der LED, welche im Normalbetrieb deaktiviert ist, zeigt somit dem Werkzeugbediener direkt an, dass die Pneumatikeinheit auf eine Druckversorgung durch den Luftspeicher umgeschaltet hat. Durch die Möglichkeit, die Anzeigeeinheit direkt am Hydraulikwerkzeug anzuordnen, wird die Prozesssicherheit in ergänzender Weise gesteigert.The connection element is, for example, a plug unit which enables the electrical connection of an external LED. The connection element thus makes it possible to arrange the display unit at any desired location, from where it can be connected to the connection element, for example the plug unit, with suitable electrical lines. By way of the connection element, for example, an LED arranged on the hydraulic tool can be connected. Activation of the LED, which is deactivated in normal operation, thus directly indicates to the tool operator that the pneumatic unit has switched to a pressure supply through the air storage. The possibility of arranging the display unit directly on the hydraulic tool increases the process reliability in a complementary manner.

Die konstruktive Ausgestaltung der Pneumatikeinheit ist grundsätzlich frei wählbar. Nach einer vorteilhaften Ausgestaltung der Erfindung weist diese jedoch einen Tragrahmen mit Aufnahmen zur Anordnung des hydropneumatischen Druckübersetzers an der Pneumatikeinheit auf. An einen Druckübersetzer angepasste Aufnahmen ermöglichen es, den Druckübersetzer ortsfest an der Pneumatikeinheit anzuordnen. Die Pneumatikeinheit und der Druckübersetzer können so eine platzsparende Baueinheit bilden.The structural design of the pneumatic unit is basically arbitrary. According to an advantageous embodiment of the invention, however, this has a support frame with receptacles for the arrangement of the hydropneumatic pressure booster on the pneumatic unit. Adjacent to a pressure booster receptacles make it possible to arrange the pressure intensifier stationary on the pneumatic unit. The pneumatic unit and the pressure booster can thus form a space-saving structural unit.

Nach einer besonders vorteilhaften Ausgestaltung der Erfindung ist dabei vorgesehen, dass die Aufnahmen durch zur Aufnahme von Standfüßen ausgebildete Rohre gebildet sind. Die Verwendung derart ausgebildeter Rohre ermöglicht eine platzsparende, übereinander erfolgende Anordnung von Pneumatikeinheit und Druckübersetzer. Die Rohre erstrecken sich dabei - bezogen auf eine Gebrauchslage - in vertikaler Richtung und sind derart im Abstand voneinander angeordnet, dass der Druckübersetzer mit seinen Standfüßen in den Rohren aufgenommen wird.According to a particularly advantageous embodiment of the invention, it is provided that the recordings are formed by trained for receiving feet feet tubes. The use of such trained pipes allows a space-saving, superimposed arrangement of pneumatic unit and pressure booster. The tubes extend - in relation to a position of use - in the vertical direction and are arranged at a distance from each other, that the pressure booster is recorded with its feet in the tubes.

Ein Ausführungsbeispiel der Erfindung wird nachstehend mit Bezug auf die Zeichnungen erläutert. In den Zeichnungen zeigen:

Fig. 1
eine Funktionsskizze einer Pneumatikeinheit mit einem angeschlossenen Druckübersetzer im Normalbetrieb;
Fig. 2
eine Funktionsskizze der Pneumatikeinheit mit angeschlossenem Druckübersetzer von Fig.1 bei einer Druckluftversorgung durch einen Luftspeicher der Pneumatikeinheit;
Fig. 3
eine erste perspektivische Ansicht der Pneumatikeinheit von Fig.i;
Fig. 4
eine zweite perspektivische Ansicht der Pneumatikeinheit von Fig.1 und
Fig. 5
eine perspektivische Ansicht der aneinander angeordneten Pneumatikeinheit und Druckübersetzer von Fig.1 mit zugeordnetem Hydraulikwerkzeug.
An embodiment of the invention will be explained below with reference to the drawings. In the drawings show:
Fig. 1
a functional sketch of a pneumatic unit with a connected pressure intensifier in normal operation;
Fig. 2
a functional sketch of the pneumatic unit with connected pressure intensifier of Fig.1 in a compressed air supply through an air reservoir of the pneumatic unit;
Fig. 3
a first perspective view of the pneumatic unit of Figi;
Fig. 4
a second perspective view of the pneumatic unit of Fig.1 and
Fig. 5
a perspective view of the juxtaposed pneumatic unit and pressure booster of Fig.1 with associated hydraulic tool.

In Fig. 1 und Fig. 2 ist ein Ausführungsbeispiel einer Pneumatikeinheit 1 in einer Prinzipskizze wiedergegeben. Die Pneumatikeinheit 1 ist über einen Drucklufteingang 2 an eine externe Druckluftversorgung 20 angeschlossen, wobei diese im Kraftfahrzeugwerkstattbetrieb üblicherweise 6 bar beträgt. Die über den Drucklufteingang 2 in die Pneumatikeinheit 1 einströmende Druckluft wird über eine Druckluftweiche 5 in die Systemleitung 4 sowie eine Bypassleitung 7 geleitet. Über die Bypassleitung 7 gelangt der Druckluftstrom in einen Druckverstärker 9, welcher den Eingangsdruck der Druckluft verdoppelt. An den Druckverstärker 9 schließt sich ein Druckluftspeicher 8 an, in dem die vom Druckverstärker 9 bereitgestellte Druckluft gespeichert wird. An den Druckluftspeicher 8 schließt sich wiederum ein Druckregelventil 10 an, welches die aus dem Druckluftspeicher 8 bereitgestellte Druckluft auf einen Wert knapp unterhalb des am Drucklufteingang 2 anliegenden Drucks der Druckluft, im vorliegenden Beispiel 6 bar, reduziert. Hierdurch wird erreicht, dass an der sich an das Druckregelventil 10 anschließenden, als Oder-Ventil 6 ausgebildeten zweiten Druckweiche ein Druck anliegt, der knapp unter dem Leitungsdruck der Systemleitung 4 liegt, welche ebenfalls mit dem Oder-Ventil 6 verbunden ist.In Fig. 1 and Fig. 2 an embodiment of a pneumatic unit 1 is shown in a schematic diagram. The pneumatic unit 1 is connected via a compressed air inlet 2 to an external compressed air supply 20, wherein this is usually 6 bar in motor vehicle workshop operation. The incoming via the compressed air inlet 2 in the pneumatic unit 1 compressed air is passed via a compressed air switch 5 in the system line 4 and a bypass line 7. About the bypass line 7 of the compressed air stream enters a pressure booster 9, which doubles the inlet pressure of the compressed air. The pressure amplifier 9 is followed by a compressed air reservoir 8, in which the compressed air provided by the pressure booster 9 is stored. To the compressed air reservoir 8 in turn is followed by a pressure control valve 10, which reduces the compressed air from the compressed air reservoir 8 to a value just below the voltage applied to the compressed air inlet 2 pressure of the compressed air, in the present example 6 bar. This ensures that adjoining the pressure control valve 10, designed as an OR valve 6 second pressure switch a pressure is applied which is just below the line pressure of the system line 4, which is also connected to the OR valve 6.

In dem in Fig. 1 dargestellten Normalbetrieb, d.h. bei einem konstanten Leitungsdruck in der Systemleitung 4 befindet sich das Oder-Ventil 6 in der in Fig. 1 dargestellten Position, in dem die Druckluft über den Drucklufteingang 2 und die erste Druckluftweiche 5 über die Systemleitung 4 durch das Oder-Ventil 6 in Richtung auf einen Druckluftausgang 3 strömt. Die aus dem Druckluftspeicher 8 zur Verfügung gestellte Druckluft wird über das Oder-Ventil 6 gesperrt.In the in Fig. 1 illustrated normal operation, ie at a constant line pressure in the system line 4 is the OR valve 6 in the in Fig. 1 shown position in which the compressed air flows via the compressed air inlet 2 and the first compressed air switch 5 via the system line 4 through the OR valve 6 in the direction of a compressed air outlet 3. The compressed air made available from the compressed air reservoir 8 is blocked via the OR valve 6.

Im Bereich zwischen dem Oder-Ventil 6 und dem Druckluftausgang 3 ist ferner ein Druckschalter 12 angeordnet, der so ausgebildet ist, dass er bei dem vorgegebenen Leitungsdruck, vorliegend 6 bar, über ein 3/2-Wegeventil 13 ein als 5/2-Wegeventil ausgebildetes Sperrventil 11 schaltet, sodass die Systemleitung 4 den Druckluftstrom zum Druckluftausgang 3 freigibt.In the area between the OR valve 6 and the compressed air outlet 3, a pressure switch 12 is further arranged, which is designed so that it at the predetermined line pressure, in this case 6 bar, via a 3/2-way valve 13 as a 5/2-way valve trained check valve 11 switches, so that the system line 4 releases the compressed air flow to the compressed air outlet 3.

An dem Druckluftausgang 3 ist im vorliegenden Ausführungsbeispiel ein Druckübersetzer 18 angeordnet, welcher den Pneumatikdruck in einen Hydraulikdruck umwandelt, mittels dem ein an den Druckübersetzer 18 angeschlossenes Hydraulikwerkzeug 19 betätigbar ist, wobei an dem Hydraulikwerkzeug 19 eine Anzeigeeinheit in Form einer LED 21 angeordnet ist.At the compressed air outlet 3, a pressure booster 18 is arranged in the present exemplary embodiment, which converts the pneumatic pressure into a hydraulic pressure, by means of which a hydraulic tool 19 connected to the pressure booster 18 can be actuated, wherein a display unit in the form of an LED 21 is arranged on the hydraulic tool 19.

Kommt es zu einem Druckabfall oder Druckausfall, wodurch der Druck in der Systemleitung 4 unter den vorgegebenen Wert, im vorliegenden Beispiel 6 bar, fällt, dann schaltet das Oder-Ventil 6 in den in Fig. 2 dargestellten Zustand, in dem der Druckluftstrom aus dem Druckluftspeicher 8 freigegeben wird. Nachdem durch den Druckluftspeicher 8 nunmehr in dem an das Oder-Ventil 6 anschließenden Bereich der Systemleitung 4 weiterhin der erforderliche Systemdruck anliegt, verhält sich der Druckschalter 12 wie im Normalbetrieb und gibt über das 3/2-Wegeventil 13 und das 5/2-Wegeventil 11 den Druckluftstrom zum Druckluftausgang 3 frei.If there is a pressure drop or pressure failure, whereby the pressure in the system line 4 falls below the predetermined value, in this example 6 bar, then the OR valve 6 switches to the in Fig. 2 illustrated state in which the compressed air flow is released from the compressed air reservoir 8. After the required system pressure continues to be applied through the compressed air accumulator 8 in the region of the system line 4 adjoining the valve 6, the pressure switch 12 behaves as in normal operation and outputs the 3/2-way valve 13 and the 5/2-way valve 11 the compressed air flow to the compressed air outlet 3 free.

Im Bereich zwischen dem Druckregelventil 10 und dem Oder-Ventil 6 ist in der Bypassleitung 7 ein Druckluftgenerator 14 angeordnet, welcher nach Art einer Turbine elektrischen Strom generiert. Im Falle der Druckluftversorgung des Druckluftausgangs 3 über den Druckluftspeicher 8 wird der Druckluftgenerator 14 kontinuierlich durchströmt und erzeugt elektrische Energie, welche über eine Leitung zu der am Hydraulikwerkzeug 19 angeordneten LED 21 geführt wird, welche dann zu leuchten beginnt. Die LED 21 signalisiert somit dem Werkzeugnutzer, dass in der Systemleitung 4 ein unzureichender Druck zur Verfügung steht und dass nunmehr die Pneumatikeinheit 1 über den Druckluftspeicher 8 Druckluft bereitstellt.In the area between the pressure control valve 10 and the OR valve 6, a compressed air generator 14 is arranged in the bypass line 7, which in the manner of a turbine electrical Electricity generated. In the case of the compressed air supply of the compressed air outlet 3 via the compressed air reservoir 8, the compressed air generator 14 is continuously flowed through and generates electrical energy which is conducted via a line to the arranged on the hydraulic tool 19 LED 21, which then starts to glow. The LED 21 thus signals the tool user that insufficient pressure is available in the system line 4 and that now the pneumatic unit 1 provides compressed air via the compressed air reservoir 8.

Durch eine entsprechende Dimensionierung des Druckluftspeichers 8 kann der Werkzeugnutzer jedoch zumindest den begonnenen Arbeitsvorgang (Ausfahren eines Kolbens am Hydraulikwerkzeug, Aufbau des Maximaldrucks und Einfahren des Arbeitskolbens) beenden.By appropriate dimensioning of the compressed air accumulator 8, however, the tool user can end at least the work process begun (extension of a piston on the hydraulic tool, buildup of the maximum pressure and retraction of the working piston).

In Fig. 3 und Fig. 4 ist die Pneumatikeinheit 1 in einer perspektivischen Darstellung wiedergegeben. An einem Tragrahmen 15 der Pneumatikeinheit 1 sind unter anderem vier als Rohre 16 ausgebildete Aufnahmen im Abstand voneinander angeordnet, wobei diese derart ausgebildet sind, dass sie die Standfüße 17 des Druckübersetzers 18 aufnehmen können, sodass die Pneumatikeinheit 1 und der Druckübersetzer 18 eine kompakte Baugruppe bilden. Der Druckübersetzer 18 dient zur Versorgung des Hydraulikwerkzeugs 19 über eine hier nicht dargestellte Hydraulikleitung (vgl. Fig. 5).In Fig. 3 and Fig. 4 is the pneumatic unit 1 reproduced in a perspective view. On a support frame 15 of the pneumatic unit 1, four receptacles formed as tubes 16 are spaced from one another, wherein they are designed such that they can receive the feet 17 of the pressure booster 18, so that the pneumatic unit 1 and the pressure booster 18 form a compact assembly , The pressure booster 18 serves to supply the hydraulic tool 19 via a hydraulic line, not shown here (see. Fig. 5 ).

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Pneumatikeinheitpneumatic unit
22
DrucklufteingangCompressed air inlet
33
DruckluftausgangCompressed air outlet
44
Systemleitungsystem management
55
erste Druckluftweichefirst compressed air switch
66
zweite Druckluftweiche / Oder-Ventilsecond compressed air diverter / or valve
77
Bypassleitungbypass line
88th
DruckluftspeicherCompressed air storage
99
Druckverstärkerbooster
1010
DruckregelventilPressure control valve
1111
Sperrventil / 5/2-WegeventilShut-off valve / 5/2-way valve
1212
Druckschalterpressure switch
1313
3/2-Wegeventil3/2-way valve
1414
DruckluftgeneratorCompressed air generator
1515
Tragrahmensupporting frame
1616
Aufnahmen / RohreShots / tubes
1717
Standfüßestands
1818
DruckübersetzerPressure intensifier
1919
Hydraulikwerkzeughydraulic tool
2020
DruckluftversorgungAir Supply
2121
Anzeigeeinheit / LEDDisplay unit / LED

Claims (10)

  1. A pneumatic unit for a hydropneumatic pressure booster, comprised of:
    - a system line (4) leading from a compressed air inlet (2) to a compressed air outlet (3),
    - a bypass line (7) which runs parallel to the system line (4), in the region between the compressed air inlet (2) and the compressed air outlet (3), and is connected to the system line (4) via a first compressed air switch (5) and a second compressed air switch (6),
    - a compressed air reservoir (8) disposed in the bypass line (7),
    - a pressure intensifier (9) disposed in the region between the first compressed air switch (5) and the compressed air reservoir (8),
    wherein the second compressed air switch (6) is configured to switch the compressed air flow between the system line (4) and the bypass line (7).
  2. The pneumatic unit according to claim 1, characterized in that the second compressed air switch is configured as a pneumatic shuttle valve ("OR valve") (6), and a pressure control valve (10) is disposed in the region between the compressed air reservoir (8) and the pneumatic shuttle valve (6).
  3. The pneumatic unit according to claim 1 or 2, characterized in that an adjustable pressure-dependent blocking valve (11) is disposed in the region between the compressed air outlet (3) and the second compressed air switch (6).
  4. The pneumatic unit according to claim 3, characterized in that the blocking valve (11) can be actuated via a pressure switch (12) which is connected to the system line (4) in the region between the second compressed air switch (6) and the blocking valve (11).
  5. The pneumatic unit according to claim 4, characterized in that the pressure switch (12) is connected to a 3/2-way valve (13), that, for purposes of controlling the blocking valve (11) which is configured as a 5/2-way valve, is connected to said blocking valve (11).
  6. The pneumatic unit according to one or more of the preceding claims, characterized in that a compressed air generator (14) is disposed in the region between the compressed air reservoir (8) and the second compressed air switch (6).
  7. The pneumatic unit according to claim 6, characterized in that the compressed air generator (14) is connected to an optically functioning and/or acoustically functioning indicator unit (21).
  8. The pneumatic unit according to claim 6, characterized in that the compressed air generator (14) is connected to a connecting element for connecting to an indicator unit (21).
  9. The pneumatic unit according to one or more of the preceding claims, characterized by a support frame (15) with receiving elements (16) for disposing the hydropneumatic pressure booster (18) on the pneumatic unit (1).
  10. The pneumatic unit according to claim 9, characterized in that the receiving elements are comprised of tubular elements (16) configured for accommodating support feet.
EP18174122.4A 2017-05-29 2018-05-24 Pneumatic unit for a hydropneumatic pressure booster Active EP3409950B1 (en)

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US10677267B2 (en) 2020-06-09
DE102017111656B3 (en) 2018-08-16
EP3409950A1 (en) 2018-12-05

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