traverse mechanism of heavy workpiece

Last crawled date: 1 year, 10 months ago

purpose and action
through the linear guide rail to support the load, reduce the transverse movement mechanism of power transmission.
through the shaft, pulley and belt, the rotary motion generated by the servo motor and the plate on the linear guide rail are converted into the shuttle mechanism of linear motion.
environment and operability
automatic mechanism based on servo motor.
object artifact
large pallet + workpiece
shape: w125 × d125 × h150mm (one pallet can hold 12 at most)
workpiece weight: 535kg
characteristic
specification and size
sliding stroke: 500mm
dimension: w700 × d1890 × h228mm
accuracy and load
repeat accuracy of pallet positioning: ± 0.02mm
weight: 535 × μ (= 0.03) = 16.05kg
selection basis of main parts
motor
for high precision positioning.
linear guide rail
reduce the weight of the conveyor.
in order to obtain the forward precision of reciprocating straight line.
key points of design
calculation process of main parts
verify whether the synchronous toothed belt and servo motor can bear the load and meet the required transmission speed.
synchronous toothed belt
allowable tension: 4320n
maximum torque of servo motor: 14.4n · m
motor shaft diameter: 0.035m
the maximum torque of the part with 0.098m pulley diameter: 14.4 × 0.098 / 0.035 = 40.3n · m
force of one belt: f = (40.3 × 2 / 0.098) / 2 = 408n
408 n < 4320n, no problem
servo motor
motor speed: 0 ～ 2000 (rpm)
internal reduction ratio (ia): 1 / 9
external reduction ratio (ib): 40 (φ 80) / 49 (φ 98)
diameter of rotating pitch circle (dp): 80mm
transmission speed: (ns) × (dp) × π× (ia) × (ib) × 1 / 60
=600×80×π×(1/9)×(40/49)×1/60＝228mm/sec
(according to the operating speed (ns): 600rpm)
key points of structure making and design
rotary servo motor, horizontal movement of the tray mechanism.
the l-shaped synchronous toothed belt with stable and synchronous transmission is selected to configure the core wire in parallel.