00198150-02_SM_TX_en - 第160页
7 Conveyor 7.5 Conveyor Belt, Belt Drive and Hexagonal Shaft 160 Service Manual SIPLACE TX Series 06/2017 ► Check the belt tension at the relevant measuring point. ► If the belt tension is not correct, adjust the movable…
7 Conveyor
7.5 Conveyor Belt, Belt Drive and Hexagonal Shaft
Service Manual SIPLACE TX Series 06/2017 159
7.5.2 Belt Tension
The precalculated values for setting the belt tension can be found in the following chapters.
In addition, the value for any section of the conveyor belt can be calculated using a formula
(see 7.5.2.2 "Calculating the Belt Tension" [}160]).
7.5.2.1 Setting the Tension of the Conveyor Toothed Belt
Parts, equipment and tools
●
Belt tension measuring device [00326015‑xx]
If the input/output extension option is installed:
●
Assembly instructions "Input/output extension option – SIPLACE TX‑Series" [DE
+EN:00198141‑xx]
Overview of measuring points and values
Fig.216: Measuring points
A Movable idler pulleys
1 Measuring point on the toothed belt in the input area 49 +/- 5 Hz
2 Measuring point on the toothed belt in the placement area 62 +/- 5 Hz
3 Measuring point on the toothed belt in output area 170 +/- 10 Hz
Adjustment
NOTICE
Pulling out the COT insert
To gain better access to the various screws, you may need to pull the COT insert out a
little.
Replacing the COTi Central Unit and Lifting Mechanics [}235]
► Use the software or manually move the conveyor rail into a position which allows you best ac-
cess.
– To move the conveyor rail manually, pull the toothed belt of the width adjustment unit.
► Switch off the machine, disconnect it from the power supply and secure it to prevent
unauthorized reactivation. Observe the instructions in section 1.2 "Preparatory Work..." [}15].
► Move all gantries out of the transport area as far as possible at one side of the machine.
7 Conveyor
7.5 Conveyor Belt, Belt Drive and Hexagonal Shaft
160 Service Manual SIPLACE TX Series 06/2017
► Check the belt tension at the relevant measuring point.
► If the belt tension is not correct, adjust the movable idler pulley.
CAUTION
Do not let the T groove nut fall into the conveyor wall!
► Do not remove the movable idler pulley completely, to make sure that the grooved nut
does not fall into the conveyor wall.
► Repeat the measurement four times.
See also
2 Replacing the COTi Central Unit and Lifting Mechanics [}235]
7.5.2.2 Calculating the Belt Tension
NOTICE
For conveyor belt only
This calculation only applies to the conveyor belts of SIPLACE TX machines.
Fig.217: Measuring the distance
► Define the two idler pulleys between which you
want to set the belt tension. If possible, do not
use the movable idler pulleys.
► Measure the distance between the two idler pul-
leys parallel to the conveyor belt. (see dia-
gram)
CAUTION!
Note that it is not always possible to simply
measure the distance between the idler pulleys
from center to center.
.
► Calculate the belt tension using the following for-
mula:
(15000 / idler pulley spacing [mm]) [Hz]
The permissible tolerance is always plus/minus 10%
of the calculated value.
Example
Distance between the idler pulleys: 235mm
Calculation:
15000 / 235 = 64 (rounded, exactly 63.829…)
10 % von 63.829… = 6 (rounded, exactly 6.3829…)
Result:
Belt tension: 64 +/- 6 Hz
7 Conveyor
7.5 Conveyor Belt, Belt Drive and Hexagonal Shaft
Service Manual SIPLACE TX Series 06/2017 161
7.5.3 Replacing the Idler Pulley [03092899Sxx]
Parts, equipment and tools
Select the required idler pulley:
●
Idler pulley 20x5 M-C assy [03121206‑xx]
●
Idler pulley 20x2.5 M-C assy [03121201‑xx]
You also need the following:
●
Magnet lifter, if needed or tweezers and adhesive tape
●
Torque screwdriver ESD 0.4 - 1.0 Nm [00386253‑xx]
●
Bit holder for TorqueVario screwdriver [03078706-xx]
●
Bit, size 4
●
Measuring scale, if needed
●
Belt tension measuring device [00326015‑xx]
Overview
Fig.218: Idler pulley
1. Idler pulley front side
2. Idler pulley back side
WARNING!
Torque
Tighten the fastening screw with a torque of 0.58
Nm. Make sure that you do not tighten the
screws too much. This could cause irreparable
damage to the conveyor!
The corresponding thread is only in 1.5 to 2mm
thick plates and could be damaged if you use a
torque which is too high.
For this reason, avoid using screws which are
too short. Use a measuring scale to check, if
needed!
This could cause irreparable damage to the con-
veyor!
.
Fig.219: Movable idler pulleys
1. Movable idler pulleys
CAUTION!
Fix the T slot nut!
When replacing a movable idler pulley, fix the T
slot nut to the inner side of the conveyor wall
(see description below).
.