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The Problem:
The netted-belt cylinder acts as a support wheel for a very wide belt that is made out of a fine
nylon net. This netted-belt rotates at varying speeds between 800 and 1000 [m/min]. The
customer wishes to change the angle at which the netted-belt meets an identical netted-belt
from below. In order to achieve that, the netted-belt cylinder must be able to change its
position. The cylinder is 6 meters long and weighs 4000 Kg and because it acts as a support
wheel it needs to lowered/raised in a completely horizontal manner. Otherwise the netted-
belt might slip off.
The Main User Specified Request:
Having real-time control, in an accurate manner, over the angle at which the lower and upper
netted-belts meet each other.
The Main Objective:
Developing a parallel lifting/lowering apparatus for a netted-belt-cylinder, in an accurate
fashion according to the will of the operator and during manufacturing.
Operating The Parallel Lifting Apparatus - HMI:
1. Click on the field “L = _ [mm]” to open up a
number keyboard.
2. Enter the desired length for the opening of the
screw-jack.
3. Press “ENTER” and the motor will begin to rotate.
Parallel Lifting Apparatus for a Netted-Belt
Cylinder
Jair Barzilay
Advisor: Mr. Assaf Vilenski
Mechanical Engineering
The parallel lifting apparatus is designed to horizontally
lower/raise a rotating cylinder which is 6 meters long and
weighs 4000 Kg. It is operated through an easy to use touch
screen HMI.
Upper netted-belt
Static System
Dynamic System
The Solution:
The netted-belt cylinder is mounted on two swinging arms which are actuated by a set of two
screw-jacks, one on each side, that are connected through a driving shaft. A screw-jack is a
mechanical device which transforms torsional torque into a pulling or compressing force. The
screw-jack on the right side is connected to a servo-motor which is controlled through an HMI
touch-screen side panel.
Screw-Jack
AC Servo-Motor
Swing-Arm
Netted-Belt Cylinder
Stationary Frame
Driving Shaft
(3)
(1)
(2)