YAMAHA-YG系列 换螺杆指导书.pdf - 第28页
Service Engineer Service I nformati on SI080 2008 E-000 = YG series: Replacement proc edure for ball screws of each axis 28/65 3. Remove the two bolts that fix the joint located at the upper part of the ball screw, then …
Service Engineer
Service Information
SI0802008E-000= YG series: Replacement procedure for ball screws of each axis
27/65
Required tools
- Hex wrench set
- Phillips-head screw driver (Standard type)
- Nipper
- Tension gauge
- New ball screw for the PU-axis
- Some cable ties
- Marker pen (Used after checking if the screws are tightened properly)
3.1. How to remove the ball screw of the PU-axis
* This section describes how to replace the PU-Axis ball screw taking a single PU-axis of YG88 and
YG100 models as an example.
1. Please make sure to perform Return-to-origin and turn off the machine before replacment.
Caution:
The driving motor of the PU-axis (AC servo) is equipped with a brake, and the brake is applied except
when the motor is rotating. Please do not rotate the shaft with the brake applied.
2. Remove the bolts on the upper surface of the push-up that fix the plate 1 with a hex wrench in
order to remove the plate 1.
Caution:
As the plate 1 is heavy, please be careful not to damage the conveyor frame by banging the plate on it
or drop it.
Figure 34
Plate 1
Service Engineer
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SI0802008E-000= YG series: Replacement procedure for ball screws of each axis
28/65
3. Remove the two bolts that fix the joint located at the upper part of the ball screw, then lift up the
stay to separate it from the ball screw.
Figure 35
Caution:
Please do not loosen the bolts that fix the shaft of the ball bush to the stay.
Please be careful not to lose the damper attached to the BALL BUSH & SHAFT as it may remain on
the ball bush, or come with the shaft or fall into the machine.
4. Loosen the four bolts that fix the motor bracket with a hex wrench in order to remove the belt.
Note:
A brake is built into the PU-axis motor. When the motor and the ball screw are separated, the ball
screw goes down while rotating and comes off from the axis unit due to its own weight.
Please make sure to fasten a cable tie around the ball screw at just above the pulley in order to
prevent the ball screw from dropping before loosening the motor bracket.
[YG100 & YG88]
Figure 36
Ball screw
Fixing bolt
Joint
Stay
Joint
Shafts of the ball bush
Ball screw
Motor bracket of the PU axis
Fixing bolt
Belt
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SI0802008E-000= YG series: Replacement procedure for ball screws of each axis
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[YG100R & YG88R]
Figure 37
Note:
YG88R and YG100R machines have two ball screws. As the ball screws are driven via inter midiate
shaft, two types of belts are used. One is for driving the ball screws and the other is for interlocking the
movement of the ball screws.
5. Remove the four bolts that fix the bearing housing to the base with a hex wrench, and remove the
axis unit and the connector of the origin sensor.
Figure 38
PU-axis ball screw
Interlock belt
for PU-axis
Drive belt for
PU-axis
Motor bracket
Belt tensioner
Ball screw
ORG sensor of the PU-axis
Bolts for fixing the bearing
housing to the base (Qty:4)