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No.000223 Stacking Mechanism Using Cylinder
73
73
Vertical stacking by one cylinder
Related Category
Oil Free Bushings
| Product name | Multi-Layer Bushings/Straight |
|---|---|
| Part number | MDZB8-10 |
| Features | Has a Thin wall and is compact. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Effective for oscillating motion part in a low speed by oil free.
Available sizes
■Oil Free Bushings - Multi - Layer LF
| Material |
|---|
| Ethylene Tetrafluoride Resin Layer with Filler Material Sintered Bronze Layer Steel-backed Metal Layer (SPCC: Tin Plating) |
■Sizes and Dimensions
| I.D.(mm) | Length(mm) | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3 | 4 | 5 | 6 | 8 | 10 | 12 | 15 | 20 | 25 | 30 | 35 | 40 | 50 | 60 | |
| 3 | ○ | ○ | ○ | ○ | - | - | - | - | - | - | - | - | - | - | - |
| 4 | ○ | ○ | ○ | ○ | ○ | - | - | - | - | - | - | - | - | - | - |
| 5 | ○ | ○ | ○ | ○ | ○ | - | - | - | - | - | - | - | - | - | - |
| 6 | ○ | ○ | ○ | ○ | ○ | ○ | ○ | - | - | - | - | - | - | - | - |
| 8 | - | - | ○ | ○ | ○ | ○ | ○ | ○ | - | - | - | - | - | - | - |
| 10 | - | - | - | ○ | ○ | ○ | ○ | ○ | ○ | - | - | - | - | - | - |
| 12 | - | - | - | ○ | ○ | ○ | ○ | ○ | ○ | - | - | - | - | - | - |
| 13 | - | - | - | - | ○ | ○ | ○ | ○ | ○ | - | - | - | - | - | - |
| 15 | - | - | - | - | ○ | ○ | ○ | ○ | ○ | ○ | - | - | - | - | - |
| 16 | - | - | - | - | - | ○ | ○ | ○ | ○ | ○ | - | - | - | - | - |
| 18 | - | - | - | - | - | ○ | ○ | ○ | ○ | ○ | ○ | - | - | - | - |
| 20 | - | - | - | - | - | ○ | ○ | ○ | ○ | ○ | ○ | - | - | - | - |
| 22 | - | - | - | - | - | ○ | ○ | ○ | ○ | ○ | ○ | - | - | - | - |
| 25 | - | - | - | - | - | ○ | ○ | ○ | ○ | ○ | ○ | ○ | - | - | - |
| 30 | - | - | - | - | - | - | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | - |
| 35 | - | - | - | - | - | - | - | - | ○ | ○ | ○ | ○ | ○ | ○ | - |
| 40 | - | - | - | - | - | - | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | - |
| 50 | - | - | - | - | - | - | - | - | ○ | ○ | ○ | ○ | ○ | ○ | ○ |
Accuracy Info
■Accuracy of Oil Free Bushing
| I.D. (mm) | I.D. tolerance (mm) |
|---|---|
| 3 | +0.047 +0.017 |
| 4 | |
| 5 | +0.055 +0.025 |
| 6 | |
| 8 | |
| 10 | +0.060 +0.030 |
| 12 | |
| 13 | |
| 15 | +0.060 +0.030 |
| 16 | +0.065 +0.035 |
| 18 | +0.070 +0.035 |
| 20 | +0.080 +0.045 |
| 22 | |
| 25 | +0.085 +0.050 |
| 30 | +0.090 +0.050 |
| 35 | +0.095 +0.055 |
| 40 | |
| 50 | +0.105 +0.065 |
Performance info.
■Allowable Properties of Oil free Bushing (Reference Values)
| Regular | Non-lubricated | |
|---|---|---|
| Maximum Allowable Load | 29N/mm² | |
| Maximum Allowable Velocity | 1.00m/s | 0.5m/s |
| Maximum Allowable PV Value | 3.25N/mm²･m/s | 1.65N/mm²･m/s |
Extra Thin Resin Washers
| Product name | Extra Thin Resin Washers/Abrasion Resistance/Thickness |
|---|---|
| Part number | SWSPS16-8-1.0 |
| Features | Extra thin washer with excellent low friction and abrasion resistance. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Effective for rotation force along thrust direction in low speed.
Available sizes
■Extra Thin Resin Washer (Abrasion Resistant Type)
Material: Polyslider.
■Sizes and Dimensions
| O.D. | Inner Dia. (Selectable) | Thickness | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 8 | 3 | 4 | 5 | - | - | - | - | - | - | - | 0.13 0.25 0.5 1.0 |
| 10 | - | 4 | 5 | 6 | - | - | - | - | - | - | |
| 12 | - | 4 | 5 | 6 | 8 | - | - | - | - | - | |
| 14 | - | - | 5 | 6 | 8 | 10 | - | - | - | - | |
| 15 | - | - | 5 | 6 | 8 | 10 | 12 | - | - | - | |
| 16 | - | - | - | 6 | 8 | 10 | 12 | - | - | - | |
| 20 | - | - | - | 6 | 8 | 10 | 12 | 15 | 16 | - | 0.25 0.5 |
| 25 | - | - | - | 6 | 8 | 10 | 12 | 15 | 16 | 20 | |
Accuracy Info
■Thickness Tolerance of Extra Thin Resin Washer (Abrasion Resistant Type)
| Thickness | 0.13 | 0.25 | 0.5 | 1.0 |
|---|---|---|---|---|
| Tolerance | ±0.013 | ±0.025 | ±0.05 | ±0.1 |
Performance info.
■Characteristic Data of Extra Thin Resin Washer (Abrasion Resistant Type)
| Item | Value |
|---|---|
| Tensile Strength (Mpa) | 98 |
| Elongation (%) | 60 |
| Friction Coefficient (μ) | 0.16 ~ 0.4 |
| Insulation Resistance (kV/mm) | 45 |
Shaft Collars
| Product name | Shaft Collars/Set Screw Mounted/Standard/Compact |
|---|---|
| Part number | PSCC8-8 |
| Features | Low Cost and Common Type. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Effective for positioning stopper along thrust direction of shaft accessories.
Available sizes
■Shaft Collars - Set Screw
| Material | Surface Treatment |
|---|---|
| EN 1.1191 Equiv. | Black Oxide |
| Electroless Nickel Plating | |
| EN 1.4301 Equiv. | |
| EN AW-2017 Equiv. | - |
| Clear Anodize | |
| Black Anodize |
■Sizes and Dimensions
| I.D. (mm) | Thickness (mm) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 6 | 8 | 10 | 12 | 15 | 16 | 18 | 20 | 22 | 25 | |
| 5 | ○ | ○ | - | - | - | - | - | - | - | - |
| 6 | ○ | ○ | ○ | - | - | - | - | - | - | - |
| 8 | - | ○ | ○ | - | - | - | - | - | - | - |
| 10 | - | ○ | ○ | - | - | - | - | - | - | - |
| 12 | - | ○ | ○ | ○ | - | - | - | - | - | - |
| 13 | - | ○ | ○ | - | - | - | - | - | - | - |
| 15 | - | ○ | ○ | ○ | - | - | - | - | - | - |
| 20 | - | - | ○ | ○ | ○ | - | - | - | - | - |
| 25 | - | - | - | ○ | ○ | - | ○ | - | - | - |
| 30 | - | - | - | - | - | ○ | - | ○ | - | - |
| 35 | - | - | - | - | - | - | - | ○ | - | - |
| 40 | - | - | - | - | - | - | - | ○ | ○ | - |
| 50 | - | - | - | - | - | - | - | - | - | ○ |
Accuracy Info
■Accuracy of Shaft Collars
| I.D. (mm) | I.D. Tolerance (H7) |
|---|---|
| 5 | +0.012 0 |
| 6 | |
| 8 | +0.015 0 |
| 10 | |
| 12 | +0.018 0 |
| 13 | |
| 15 | |
| 20 | +0.021 0 |
| 25 | |
| 30 | |
| 35 | +0.025 0 |
| 40 | |
| 50 |
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Application Overview
Purpose
- To receive workpieces and stack them vertically.
- Operation.
- Following operations are repeated:
Workpiece feeding -> cylinder upstroke -> cylinder down stroke.
- Following operations are repeated:
Target workpiece
- Shape: Pallet with brim
- Size: W150 x D150 x H30mm
- Weight: 0.6kg
Design Specifications
Operating Conditions or Design Requirements
- External dimensions: W320 x D220 x H481mm
- Upstroke: 100mm
Required Performance
- Difference between right and left ratchets: ±0.5mm
Selection Criteria for Main Components
- Arrange ratchets to receive workpieces properly.
- Select the cylinder stroke with consideration of the required receiving ratchet motion.
- Select the cylinder diameter in consideration of the workpiece weight and the quantity of workpieces.
Design Evaluation
Verification of main components
- Validate whether the selected cylinder is adequate for the workpiece load.
- (Selection of Air Cylinder).
- Conditions (values): Operation air pressure 0.5MPa, efficiency: 0.8
- Cylinder theoretical thrust: 402N
- Since the cylinder thrust is expressed by "theoretical thrust x efficiency",
the cylinder thrust is 402 x 0.8 = 321.6N
(Validation of Load Factor). - Conditions (values): Workpiece weight = 0.6kg, workpiece quantity = 5
- Since the load is expressed by "workpiece weight x workpiece quantity) x 9.8",
the load is (0.6kg x 5 pieces) x 9.8 = 29.4N - Load factor (%) is expressed by "load/cylinder thrust) x 100"
Thus, the load factor is (29.4/321.6) x 100 = 9.1% < 50%
-> The conditions are satisfied.
Other Design Consideration
- The lower most ratchets used for this mechanism can receive workpieces firmly. However, ratchets are provided at each stage to support each workpiece, because the lower most workpiece receives the weight of the workpieces stacked up thereon.
- The stroke and the arrangement are selected to secure space in which the ratchets can retrieve the workpieces.
- In this example, the quantity of stacked workpieces is set to five. If there is ample space to stack up workpieces, approximately 30 pieces can be stacked.
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