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No.000057 Air Flow Process
38
38
Air cleaning process for conveying application
Relevant category
Conveyor rollers
| Product name | Conveyer Roller Shafts - Hollow |
|---|---|
| Part number | HROJS38-413 |
| Features | Set of Conveyor Rollers and Economical Hollow Tube Rollers. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Low Cost
Available sizes
■Conveyor roller (Shaft and roller sets)
| Material | Surface treatment | Bearing | |||
|---|---|---|---|---|---|
| Roller | Shaft | Pin | Roller・Shaft・Pin | ||
| Core material | Wheel | ||||
| Carbon Steel | Steel | Steel | Steel | Trivalent chromate | Pressed bearing |
■Dimensions
| Roller length | Name No. | Roller O.D. | Shaft bore DIA. | Shaft length | Shaft(with pin) | |
|---|---|---|---|---|---|---|
| Nominal DIA. | Actual DIA. | |||||
| 113 163 213 263 313 413 513 | 19 | φ19.1 | φ6.2 | Roller length+22 | φ6 | φ5.9 |
| 22 | φ22.2 | |||||
| 28 | φ28.6 | φ8.2 | Roller length+22 | φ8 | φ7.85 | |
| 38 | φ38.1 | φ12.2 | Roller length+27 | φ12 | φ11.8 | |
| 42 | φ42.7 | |||||
| 50 | φ50.8 | |||||
| 57 | φ57.2 | |||||
*Lengths 163 and 263 for Name No. 22 are not available.
Performance info.
■Speeds・Loads (Load info.)
(N)
| Roller length(mm) | |||||||
|---|---|---|---|---|---|---|---|
| Name No. | 113 | 163 | 213 | 263 | 313 | 413 | 513 |
| 19 | 431 | 318 | 205 | 436 | 343 | 294 | 206 |
| 22 | 431 | − | 205 | − | 343 | 294 | 206 |
| 28 | 490 | 490 | 490 | 450 | 687 | 588 | 412 |
| 38 | 1342 | 1342 | 1342 | 1132 | 922 | 785 | 588 |
| 42 | 1667 | 1628 | 1589 | 1310 | 1030 | 883 | 745 |
| 50 | 1716 | 1628 | 1648 | 1584 | 1520 | 1442 | 1147 |
| 57 | 2354 | 2206 | 2059 | 1912 | 1765 | 1471 | 1157 |
Flat air nozzle, Air amplified type
| Product name | Flat Air Nozzles Air-Amplied Type |
|---|---|
| Part number | AFTAD15 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Since ample air flow is needed.
Available sizes
■Flat air nozzle, Air amplified type
| Material | Max. operating pressure | Heat resistant temperature | Air flow volume (@0.3MPa) | Thread DIA. for connecting pipe | Air outlet width | Overall width | Overall length |
|---|---|---|---|---|---|---|---|
| PPS resin | 0.7MPa | 200℃ | 440NL/min | Ｒ1/4 | 46 | 52 | 57.3 |
| 5052 Aluminum AlloyP | 0.4MPa | 60 | 60 |
Mechanism info.
■Structure of air amplified flat air nozzle
Air is induced from the comb teeth on the nozzle tip and air increase hole in the back where the air flow and speed are amplified.
It utilizes surrounding air to create the air jet with high collision impact with small amount of air.
Performance info.
■Air flow volume of amplified air blow nozzle
Air flow (@0.3MPa): 440NL/min
IDEA NOTE Use easily obtained commercially available components for large quantity items such as pallet locating pins, metal washers, and point pads.
| Part No. | Part name | Manufacturer name | Part number | Qty. | Reference price (Unit: JPY) | Subtotal (Unit: JPY) | Reference ship date |
| 1 | Rough guide pin | MISUMI | RGPS10-30 | 24 | 1,060 | 25,440 | 3rd day |
| 2 | Point pads | MISUMI | PDUPK20 | 12 | 440 | 5,280 | Same day |
| 3 | Metal washer | MISUMI | FWSSB-D20-V3-T5 | 12 | 340 | 4,080 | 3rd day |
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Application Overview
Purpose
- Amplified air flow nozzle used to direct flow over a thin plate product.
Target workpiece
- PC board
- Workpiece size: 240 x 305, t2 mm
Design Specifications
Operating Conditions or Design Requirements
- Conveyor width: 415 mm
- External dims.:W475 x L1350 x H160 mm
Required Performance
- Work piece and pallet weight: 4 kg
Selection Criteria for Main Components
- Flat air nozzle
- An amplified nozzle type is selected to reduce air consumption and save energy.
Design Evaluation
Verification of main components
Verify that the air flow needed to clean the work piece is obtainable.
- Calculation of required air flow
- AFTAD15's flow rate
Conditional value: Primary pressure P1 = 0.3 MPa
Secondary pressure P2 = 0.1 MPa
Pressure differential P = P1 - P2 = 0.2 MPa
Air density ρ = 1.205 kg/m³ (Atmospheric pressure, 20℃)
Runoff coefficient C = 0.7
Orifice DIA. d = φ1 mm
When orifice cross section area A = (π × d² / 4) × 16 = 12.6 mm² = 12.6 × 10⁻⁶ m²
Flow rate Qaf = C × A × √(2 × P / ρ)
= 0.7 × 12.6 × 10⁻⁶ × √(2 × 0.2 × 10⁶ / 1.205)
= 0.7 × 12.6 × 10⁻⁶ × 576.2
= 0.0051 m³/s
= 306 L/min - Required flow rate for the air
Qa = 335 [mm] × 330 [mm] × 50 [mm] / 5 [s] = 5.5 × 10⁶ [mm³/s] = 5.5 [L/s] = 330 [L/min]
Required air flow per one AFTAD15 Qb = Qa / 4 [pc.] = 82.5 [L/min]
Therefore, Qb < Qaf is true and the air flow is sufficient.
- AFTAD15's flow rate
Other Design Consideration
- Use resin point pads to elevate the workpieces. This will allow air to be blown on the backside of the PCB and help prevent damage to the workpieces.
- An opening is provided at the center of pallets to let the blown air escape.
- Relationship of air flow on/off and sensor on/off.
Sensor: When the light beam is obstructed, the sensor is ON.
① Entry side sensor] ON, Exit side sensor: ON ⇒ Air flow: ON
② Entry side sensor: ON, Exit side sensor: OFF ⇒Air flow: ON
③ Entry side sensor: OFF, Exit side sensor: ON ⇒Air flow: ON
④ Entry side sensor: OFF, Exit side sensor: OFF ⇒Air flow: OFF
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