Electric cylinder HEZ

Function

 

As they are easy to integrate and need no maintenance, HYDACelectric cylinders (HEZ) allow simple implementation of linear movements.In an HEZ unit, the rotation of its electric motor is converted into a linearmovement using a screw drive.The gearing and the drive can be selected to realize different positioning,forces, speeds and duty cycles. Just as the KineSys variable speed drivefor hydraulic systems, various types of drives can be selected.The range extends from a simple drive to a high precision positioning drive.

The different versions have different connections for the electric motor,offering diverse installation variants.

Design

 

Via a coupling, a gear motor drives the threaded spindle, which is fixedin the bearing housing via a ball bearing. The threaded nut convertsthe threaded spindle's rotation into a linear movement.The threaded nut is connected to the piston rod via the nut housing.The piston rod passes through a sealing ring and a plain bearing.The plain bearing prevents the nut housing from twisting.To fasten the unit, there is a pivot bracket on the bearing housingand a rod end bearing on the piston rod.

Spindle types

 

Depending on the operating conditions, a trapezoidalthread drive, ball screw drive or planetary roller screwdrive can be used.

Trapezoidal thread drive

 

 

Application of trapezoidal thread spindles:

  • low positioning speed (< 35 mm/s)
  • low duty cycle (< 50 %)
  • impact load possible
  • possibility of self-locking
  • cost-effective applications
  • medium positioning accuracy (≥ 0.1 mm)

Ball screw drive

 

 

Application of ball screw spindles:

  • high positioning speed
  • high duty cycle
  • high degree of efficiency (> 85 %)
  • highly dynamic applications
  • high positioning accuracy (≥ 0.05 mm)

Planetary roller screw drive

 

 

Application of planetary roller screw spindles:

  • demanding applications
  • impact load possible
  • designed for high powers

Technical Data

 

 

The technical data can be found in the project planning documentsor in the confirmation of your order, and on the unit's name plate.

For all queries, please always provide the model code for the HEZ unitand its identification number.

 

Your inquiry can be found here.

To save the form after editing, please print it as a PDF.

 

 

Control / System Solution

 

To control the HEZ electric cylinders, there are several variants to choose from.The configuration is chosen on the basis of the particular application.We will be happy to help you select the most suitable drive concept.

Operation with decentralised HYDAC surface-mounted frequency inverter (HFI-MM) and asynchronous motor

 

For drive solutions with simple control requirements, a frequency inverter is supplied,mounted directly on the electric motor.

Properties

 

  • Smooth start-up
  • Variable feed speeds and travel profiles
  • Simple positioning tasks
  • Analogue and digital inputs / outputs
  • Optional common bus systems
  • Free-of-charge parameterisation software HMM Start-Up
  • System tailored to customer application

Operation with HYDAC switch cabinet frequency inverter (HFI-CM) and asynchronous motor

 

For more demanding applications, a more powerful inverter is used for control.This inverter is installed outside the HEZ, in a switch cabinet.

Properties

  • More complex travel profiles
  • Advanced positioning tasks
  • Various inputs / outputs possible, including bus systems
  • Free-of-charge parameterisation software
    HFI-CM Start-Up
  • System tailored to customer application

Position-regulated operation with HYDAC switch cabinet frequency inverter (HFI-CM) and HYDAC servo motor (HSM)

 

For high-precision control, regulation and positioning, the servo motor is the ideal drive.For high powers with a wide range of speeds and loads, extremely high positioningaccuracy can be achieved.

The frequency inverter is mounted externally, in a switch cabinet.

Properties

  • Maximum positioning accuracy
  • Maximum system dynamics
  • A cam disc function can be mapped
  • Various inputs / outputs possible, including bus systems
  • Free-of-charge parameterisation software
    HFI-CM Start-Up
  • System tailored to customer application

Applications

HEZ-2 for test bench

 

  • Positioning force: 10 kN
  • Positioning speed: 1 – 50 mm/s
  • Stroke: 250 mm
  • Duty cycle up to: 100 %
  • Options:
    • Limit switch
    • positioning accuracy up to 0.125 mm
    • force measurement

HEZ-0 for heliostat positioning

 

  • Positioning force: 4 kN
  • Positioning speed: 6 mm/s
  • Stroke: 250 mm
  • Duty cycle up to: 100 %
  • Options:
    • Limit switch
    • DC motor 12 / 24 V DC
    • positioning system

HEZ-X for tempering of pit coal (clamping)

 

  • Positioning force: 13 kN
  • Positioning speed: 7 mm/s
  • Stroke: 130 mm
  • Duty cycle up to: 25 %
  • Option:
    • Stainless steel version

HEZ-X for servo ejector

 

  • Positioning force: 120 kN
  • Positioning speed: 150 mm/s
  • Stroke: 150 mm
  • Duty cycle up to: 100 %
  • Options:
    • Limit switch
    • servo motor
    • distance measuring system
    • cam disc function

HEZ-X for door flap for coal conveyor belt in power plants

 

  • Positioning force: 20 kN
  • Positioning speed: 15 mm/s
  • Stroke: 600 mm
  • Duty cycle up to: 25 %
  • Options:
    • Limit switch
    • emergency operation
    • bellows
    • ATEX version

Inverse pendulum

Areas of application

 

 

As they are easy to integrate and need no maintenance, HYDAC Electric Cylinders HEZ allow simple implementationof linear movements. Various types of drives can be selected, from a simple drive to a high precision positioning drive.

They are suitable for a wide range of applications, in standard and also special customised versions:

Mechanical engineering

  • Punching, bending, ramming
  • Pressing, drawing, forming
  • Sawing, planing

Assembly systems

  • Joining, connecting
  • etc.

Food industry

  • Opening / closing
  • Conveying
  • etc.

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