Mitsubishi RH-3SQHR3515, Инструкция по эксплуатации

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Maintenance and inspection procedures
5Maintenance and Inspection
■ Inspecting the J4 axis timing belt
1) Confirm that the robot controller power is OFF.
2) Refer to
Page 65, "5.3.2 Installing/removing the cover" , and remove the No.2 arm cover and the belt pulley
cover J4.
3) Visually confirm that the symptoms indicated in "(1)Timing belt replacement period" have not occurred with
the timing belt <2>.
4) Check the belt tension as shown in "Fig.5-8 ： Belt tension" . Lightly press the center of the belt <A>, and
confirm that the value of belt slack is in following.
RH-3SQHR3515
Motor side: Force to press the belt: apprpx.2N ･ m, Flexure: approx.1.1mm
Shaft side: Force to press the belt: apprpx.4N ･ m, Flexure: approx.1.3mm
■ Adjusting the J4 axis timing belt
1) Carry out steps "1)" and "2)" indicated in " ■ Inspecting the J4 axis timing belt" above.
2) Lightly loosen the two idler installation bolts <1>. (Do not loosen too much.)
3) The nut which is fixing tension adjustment screw <3> is loosened, turn tension adjustment screw <3>, and
adjust the tension of timing belt <2>. When the screw is turned to the right, the belt will be stretched, and
when turned to the left, will loosen.
Lightly press the center of the belt <A>, and confirm that the value of belt slack is in following.
RH-3SQHR3515
Motor side: Force to press the belt: apprpx.2N ･ m, Flexure: approx.1.1mm
Shaft side: Force to press the belt: apprpx.4N ･ m, Flexure: approx.1.3mm
If the belt is loosened too much when adjusting the tension causing it to come off the timing pulleys <4> and
<5>, or if the belt and pulley teeth engagement is deviated, the machine system's origin will deviate
4) After adjustment fastens the fixing nut of tension adjustment screw <3>, and certainly fixes tension
adjustment screw <3>. Moreover, also fasten idler fixing screw <1> certainly. (two pc.) Improper tightening can
cause the belt to loosen with vibration.