Hydraulic power units

Hydraulic clamping power units or clamping pumps are especially designed for hydraulic clamping.

Hydraulic power units of compact design, ready for connection Suitable for the control of all of the listed clamping elements Individual solutions are possible by using the unique modular system. On request also with turnkey on-site installation.

Series  (3)

Items  (549)

  1. 2 clamping circuits for single-acting cylinders – with electric control and 2 manual switches – max. 500 bar, as per data sheet D8.0115
  2. 2 clamping circuits for single-acting cylinders – with electric control and 2 manual switches – with handle – max. 500 bar, as per data sheet D8.0115
  3. 2 clamping circuits for single-acting cylinders – with electric control and 2 manual switches – with oil level and temperature control – max. 500 bar, as per data sheet D8.0115
  4. 2 clamping circuits for single-acting cylinders – with electric control and 2 manual switches – with handle – with oil level and temperature control – max. 500 bar, as per data sheet D8.0115
  5. 2 clamping circuits for single-acting cylinders – with electric control and 2 foot switches – max. 500 bar, as per data sheet D8.0115
  6. 2 clamping circuits for single-acting cylinders – with electric control and 2 foot switches – with handle – max. 500 bar, as per data sheet D8.0115
  7. 2 clamping circuits for single-acting cylinders – with electric control and 2 foot switches – with oil level and temperature control – max. 500 bar, as per data sheet D8.0115
  8. 2 clamping circuits for single-acting cylinders – with electric control and 2 foot switches – with handle – with oil level and temperature control – max. 500 bar, as per data sheet D8.0115
  9. 1 clamping circuit for double-acting cylinders – with electric control and 1 manual switch – max. 500 bar, as per data sheet D8.0115
  10. 1 clamping circuit for double-acting cylinders – with electric control and 1 manual switch – with handle – max. 500 bar, as per data sheet D8.0115
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Description

Design

Hydraulic power units are supplied as compact units ready for connection:
Complete with motor, pump, reservoir, connector block, pressure gauge, pressure switch, solenoid valves and, on request, electrical control systems. Upright mounting position, pump with three or five radial pistons, direction of rotation optional.
These power units operate in energy-saving intermittent mode with automatic pressure monitoring, i.e. when the pressure set at the pressure switch is reached, the motor switches off automatically. If pressure drops 10 % below the set value the pressure switch causes the motor to start again.
Using the version with machine safety, the machine is stopped, if the clamping pressure falls by more than 15 %.

Hydraulic power units series 7.1600

Applications
These power units are especially suitable for the operation of small to medium-sized hydraulic clamping fixtures.
Maximally 2 clamping circuits for single or double-acting cylinders are available, that can be controlled independently of each other. Thereby also "shuttle machining" is possible, i.e. that during machining of the workpiece in one fixture, workpiece change on the second fixture can be made.

Description
A special feature is the mounting of pump and electric motor in the reservoir. Thus hydraulic and electric control can be arranged in a space-saving way and easily accessible on the reservoir cover. The modular design enables a multitude of control variants.
The radial piston pump is available with 3 different flow rates and operating pressures. To allow an energy-saving intermittent cycling only leakage-free poppet valves are used.

Energy-saving intermittent cycling
The electric motor is only running, as long as hydraulic oil is really required, that means to

  •  extend and retract the clamping cylinder
  •  build up the operating pressure

Example
Pressure-time diagram for single-acting clamping cylinders 

In this example of a hydraulic clamping fixture the running time of the electric motor corresponds to the clamping time, which is only a few seconds.
In standby mode the power consumption is relatively low. The conditions are leakage-free clamping elements, valves and accessories.
The pressure control is made by an electronic pressure switch, that switches on the electric motor for a short time in case of a pressure drop.

Hydraulic power unit series 7.1600
Pressure-time diagram for single-acting clamping cylinders

Power Units in Modular Design 7.1800

Operating pressure 30 to 500 bar, flow rate 0.9 to 12 l/min
reservoir sizes 11 l, 27 l, 40 l, 63 l

Application
For the operation of hydraulic clamping fixtures and other handling and clamping systems on machine tools.

Description
The power units of this series consist of individual modules that are selected depending on the application and are assembled on the basis of a type code to a power unit ready for use.

Modules

  •  Power unit (reservoir, pump, motor)
  •  Connecting block basic functions
  •  Valve block with up to 4 control circuits
  •  Electronics

Characteristics

  •  for single and double acting cylinders
  •  continuously adjustable operating pressure
  •  expandable to up to 8 pressure circuits
  •  constant flow rate
  •  wide range of valves
  •  wide range of hydraulic functions
  •  energy-saving mode S3 (intermittent mode) or S6 (unpressurised cycle)
  •  supplied ready for Connection

Equipment - Standard

  •  connecting block with pressure relief valve
  •  pressure filter 10 μm
  •  oil level gauge
  •  oil temperature gauge
  •  design without piping

Equipment - Options

  •  electronic system pressure Switch with simplified pressure adjustment by teach-in function
  •  pressure switch for machine tool interlock mechanically or electronically
  •  electrical oil level control
  •  electrical temperature control
  •  return filter
  •  electrical filter control
  •  electric control
  •  terminal box
  •  foot switch or manual switch
  •  key-operated Switch

Further Description

Power Units in Modular Design

Hydraulic clamping pump 8.800

Compact hydraulic pump with hand lever or foot pedal for pumping and releasing.
Due to the metallic seal on the pump piston, the pump is almost wear-free.
The hydraulic pump is delivered completely assembled, including the filling with hydraulic oil HLP32 as a ready-for-connection unit.
In addition to three maximum operating pressures, the following options can be selected:
• Holder for fixing the pump at the press bed or with a base for good stability.
• Pressure gauge to display the pressure reached. Display range 0 to 100 / 120 or 400 bar.
• Adjusted overload protection (DBV) to protect the roller and ball bars against damage.

Hydraulic clamping pump 8.800

PDF Data sheets

PDF

Power units Series D 8.0115 ready for connection*, energy-saving intermittent cycling - max. flow rate 0.82/2.1/3.5 l/min, max. operating pressure 500/250/160 bar

Catalogue sheet WZ7.1600
PDF

Power Units in Modular Design Operating pressure 30 to 500 bar – flow rate 0.9 to 12 l/min – reservoir sizes 11 l, 27 l, 40 l, 63 l

Catalogue sheet WZ7.1800