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During maintenance the indexing table is disengaged.
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* Unit assembly Data consists of some sub-assemblies.
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Application Overview
Purpose
Purpose
Indexing table used in magazine transfer.
Operation
A geared motor drives a urethane roller which turns the indexing table. A deceleration sensor is used in conjunction with a stop sensor to slowly bring the table to a stop. A wedge
An object that is thick at one and gradually comes thinner toward the other end.
is used to physically top the rotation of the table.
Points for use
Disengage the indexing table during maintenance. The indexing table is operated slowly.
Target workpiece
Shape: Magazine
Size: W80xD50xH140mm
Weight: 1.5kg
Design Specifications
Operating Conditions or Design Requirements
Index table outer diameter: φ290mm
4 positions
Cycle time: 1 second for 1 position
Outer dimensions: W516xD290xH195mm
Required Performance
Positioning accuracy: ±0.5mm
Load weight: 1.5×4=6kg
Selection Criteria for Main Components
Variable geared motor
As the index table cycle time t is 1 second per position, it takes 4 seconds to rotate one revolution. Therefore, the table rotation speed Nt is 15 rpm.
As the outer diameter D1 of the part driven by the urethane roller of the geared motor is φ240 and the diameter D2 of the urethane roller of the geared motor is φ30, the rotation speed N of the geared motor is D1/D2 x Nt = 240/30 x 15 = 120rpm.
A variable geared motor with a variable range of 90 to 1200rpm and a gear head with a reduction ratio i of 1/3 are selected, and the range of variable rotation speed after deceleration should be set to 30 to 400.
Design Evaluation
Verification of main components
Need to ensure the geared motor allowable torque satisfies the necessary load torque.
Confirmation of load torque of geared motor
Conditional value: index table rotation speed: Nt = 15 rpm, outer diameter of table driven part: D1 = φ240mm, diameter of the urethane roller of geared motor: D2 = φ30mm, cycle time: t = 1sec, moment of inertia of rotating part including workpiece: J = 0.083kg・m2
Rotation speed of geared motor: N = D1/D2 x Nt = 240/30 x 15 = 120rpm
Load torque of geared motor: T = J/(9.55 x 104) x N/t = 0.083/(9.55 x 104) x 120/1 = 1.04 x 10??N・m
Allowable torque of geared motor when gear head is mounted (when reduction ratio i = 1/3): Tmax = 0.06N・m ⇒Load torque: T = 1.04 x 10??N・m < allowable torque: Tmax = 0.06N・m Therefore, the load torque of geared motor is within the allowable range.
Confirmation of gear head overhang load
As the allowable overhang load of the gear head used in this device is 98N at the output shaft center, the allowable overhang load of this device is 98N x 16mm/32mm = 49N. ⇒φAs the theoretical thrust of φ16 cylinder on the push side is 40N when the operating pressure is 0.2MPa, the cylinder that presses against motor is used at 0.2MPa.
Other Design Consideration
Micro photo sensor is used as a confirmation and deceleration sensor.