Air Cylinders
|
|
New Schrader Bellows PA-2 Air Cylinder, PAS508141-6.000 $24.90 |
|
|
PARKER SERIES S AIR CYLINDER $19.99 |
|
|
Ansul Air Cylinder Assembly Part # 15733 NEW $89.95 |
|
|
Compact Air Products B34X18 Standard Duty Air Cylinder $19.95 |
|
|
SMC Air Cylinder NCMC150-0200-DUJ00240 NEW $51.99 |
|
|
FESTO AIR CYLINDER DNG DNG-32 DNG32 DNG-32-650-PV-A NIB $125.00 |
|
|
2340 NEW FESTO DSN-20-50-PPV Air Cylinder $37.50 |
|
|
Koganei BDAS16×10 pneumatic air cylinder $7.99 |
|
|
PHD AF3/4X11/2 Air Cylinder – Used $35.95 |
|
|
Fabco G-121-X “Pancake” Air Cylinder – New $32.95 |
|
|
Fabco L5XDRK “Pancake” Air Cylinder – New $65.95 |
|
|
Schrader Bellows PA-2 Air Cylinder PAA108121-5.000 $42.00 |
|
|
Chicago Cylinder PD-0190 Double Rod Air Cylinder – Used $42.95 |
|
|
New! Parker 2A Pneumatic Air Cylinder 2″ x 3″ CJ2AU18AC $32.99 |
|
|
Tiny Tim TAV-8 Air Cylinder – Used $22.95 |
|
|
Air/Hydraulic Cylinder W/Speed Control 2-1/2″ x 9″ $299.00 |
|
|
Parker 05.00 CJ2ANU18AC 36.000 Air Cylinder $325.00 |
|
|
TPC AIR CYLINDER TCA2FN100-100-XC16 COPPER FREE $180.00 |
|
|
Mosier DTF Double Ended Air Cylinder – Used $65.95 |
|
|
Used Schrader Bellows PA-2 Air Cylinder PAB102821-3.000 $38.00 |
|
|
PHD Tom Thumb AVF1X11/4PRBR-A-R Air Cylinder – Used $24.95 |
|
|
Compact Air Products BD1-5/8X2 Double Rod Air Cylinder $18.95 |
|
|
FESTO KDNCP-50-30/150-PPV DOUBLE SQUARE AIR CYLINDER $299.00 |
|
|
(2) USED PHD AIR CYLINDERS, 3/4″ by 4″, AVRF 3/4X4-D $14.00 |
|
|
PHD AIR CYLINDER CUSHION 3/4″BY 3-1/2″ AVRF 3/4X31/2-D $7.00 |
|
|
Mead 2091-30X3.0000DM-112 Air Cylinder – Used $65.95 |
|
|
PHD/Tom Thumb AVCF3/4X1/4 Air Cylinder – Used $27.95 |
|
|
SMC compact pancake air cylinders NCQ7B075-050d $7.99 |
|
|
Used Schrader Bellows PA-2 Air Cylinder PAA102421-3.250 $32.00 |
|
|
Norgren TA2-3A Air Cylinder – Used $34.95 |
|
|
FESTO DSNU-20-70-PPV-A AIR CYLINDER 14321 $29.99 |
|
|
SMC NCDQ2B100-25D Compact Double Acting Air Cylinder $87.00 |
|
|
NEW Bimba Air Cylinders 1¼ x 5 x 7/16″ Spring Return $29.00 |
|
|
Compact Air Products SD212X12 Double Rod Air Cylinder $55.95 |
|
|
TPC AIR CYLINDER TCA2T100-50 CENTER TRUNNION $110.00 |
|
|
Koganei Actuator Auxiliary Air Cylinder Dyna $99.49 |
|
|
Bimba Stainless Air Cylinder NIB $10.00 |
|
|
PHD/Tom Thumb AVRF1X1-E Air Cylinder – Used $29.95 |
|
|
AIR CYLINDER / “BIMBA” / 9″ LONG / 1-3/8″ O.D./ NEW $14.95 |
|
|
AIR CYLINDER / “BIMBA” MOD: 061-R / NEW / REVERSED $14.95 |
|
|
BIMBA AIR CYLINDER MOD: 091.5 SINGLE ACTING NEW $11.95 |
|
|
PHD/Tom Thumb AVF11/8X1-P-A-E Air Cylinder – Used $22.95 |
|
|
Humphrey 3-DP-6 Air Cylinder Brand New!! $40.00 |
|
|
SMC Pneumatics Air Cylinder CG1BN20-10 NEW $9.95 |
|
|
SMC CDQ2KA40-25D-F79 AIR CYLINDER ***NEW*** $89.99 |
|
|
New! Miller Pneumatic Air Cylinder 6″ x 4″ A-84B6B BIG $179.99 |
|
|
Compact Air Cylinder AS118X112-TM AS118X112 TM NEW $20.50 |
|
|
SMC Air Cylinder, NEW, 2 pc. 250 psi, 1-1/16” Bore, $7.99 |
|
|
ARO 4 x 2″ 3/4-16 Double-Acting Air Cylinder New $98.00 |
|
|
Norgren .3100″ Bore Pneumatic Air Cylinder 1/2″ Stroke $8.40 |
|
|
SMC Pneumatics Air Cylinder CDG1BA20-25-X339 NEW $19.85 |
|
|
Compact Air Cylinder A138X12 NM A138X12-NM 1/2″ str NEW $22.50 |
|
|
Miller Pneumatic Air Cylinder BIG 6″ x 4″ Clevis Rebui $134.99 |
|
|
Origa Rodless Air Cylinder 40mm by 8″ Stroke 115PSI $175.00 |
|
|
Compact Air Products B34X112 Single Rod Air Cylinder $17.95 |
|
|
SMC Pneumatics Air Cylinder CDGBA20-150-B73 NEW $34.95 |
|
|
FABCO AIR Cylinder H-7-XDR H7XDR 1″ stroke NEW $10.00 |
|
|
SMC Pneumatics Air Cylinder NCGBN25-0100 NEW $9.95 |
|
|
FESTO DSNU-25-65-P-A-MH AIR CYLINDER 193991 $33.00 |
|
|
2 LIN-ACT Air Cylinder ST-1.5X.5-4 1/2″ stroke NEW $22.50 |
|
|
SMC Pneumatics Air Cylinder CDQ2B32-35DC-A73L NEW $39.80 |
|
|
DESTA CO. PENUMATIC ACTUATOR AIR CYLINDER USED $47.99 |
|
|
Fabco D7XNPM Mini “Pancake” Air Cylinder – New $22.95 |
|
|
Hoerbiger Origa OSP-P63 Rodless Air Cylinder 31″ Stroke $89.99 |
|
|
PHD/Tom Thumb AB3/4X1/2-P-A Air Cylinder $14.95 |
|
|
Compact Air Products B12X38 Single Rod Air Cylinder $19.95 |
|
|
SMC Pneumatics Air Cylinder NCDME125-0800C NEW $23.95 |
|
|
FABCO-AIR INC. C 521-X PNEUMATIC PANCAKE CYLINDER NNB!! $40.00 |
|
|
Mosier TC Air Cylinder – Used $22.95 |
|
|
Tice Engineering Air Cylinder 1-1/16 Bore 2″ Stroke NR $29.99 |
|
|
Mosier TA2-1A Air Cylinder – Used $14.95 |
|
|
Bimba Line Air Cylinder BRT-010.5 Single Acting #20934 $22.50 |
|
|
Bimba 069-DXP Double Acting Air Cylinder – NEW $25.50 |
|
|
SMC Pneumatics Air Cylinder CDQ2B32-5DC-A73L NEW $29.95 |
|
|
SMC Air Cylinder NCA1KWF200-U1A9 *NEW* #21320 $49.99 |
|
|
Mosier ETF-RC Air Cylinder – Used $28.95 |
|
|
BIMBA FLAT 1 FO-170.875-4CMTM UI AIR CYLINDER $15.00 |
|
|
COMPACT AIR PRODUCTS BFH34X15/32 PNEUMATIC CYLINDER $12.99 |
|
|
SMC Pneumatics Air Cylinder CGBN20-15 NEW $11.50 |
|
|
Mosier DTAV5-F-1A Air Cylinder – Used $24.95 |
|
|
COMPACT AIR PRODUCTS AB34X34 PNEUMATIC CYLINDER $12.99 |
|
|
Tiny Tim DTAV2 Air Cylinder – Used $23.95 |
|
|
Fabco E7XDRE Mini Pancake Air Cylinder – New $35.95 |
|
|
PHD/Tom Thumb AF3/4X1/2-P-D Air Cylinder – Used $17.95 |
|
|
Schrader Bellows PA-2 Air Cylinder PAB108431-6.000 $48.50 |
|
|
Festo Air Cylinder 63mm Bore 100mm Stroke NR DNG63100PP $149.99 |
|
|
Festo Air Cylinder 50mm Bore 40mm Stroke PAIR NR ADVUL5 $249.99 |
|
|
SMC CDJP865DB MINI AIR CYLINDER W/PROXIMITY SENSOR $39.00 |
|
|
BIMBA DOUBLE WALL AIR CYLINDER DWC-172-1 DOUBLE ACTING $44.97 |
|
|
FABCO-AIR INC. D 221-X PNEUMATIC PANCAKE CYLINDER NNB!! $30.00 |
Air Cylinders Information
Inventors Notes – Switching Electronic Air Pressure Regulation
My Asparagus harvester invention utilizes pneumatic cylinders to cut the individual spears, and the stroke length has to right on the money every time. If the pressure goes up the stroke length becomes longer, and if the pressure goes down the stroke length shortens.
Too much pressure and the piston rod will bottom out against the front cylinder head, and not enough pressure will reduce the stroke length an cause the blade to not cut all the way through the spear or even not reaching the spear at all. Allowing the piston to bottom out against the front head will eventually damage the cylinder.
The asparagus harvester has 14 air cylinders mounted on the header arranged across the asparagus bed. Each piston rod is equipped with a sharp blade with a slight bit of overlap with the blades next to it. The cylinders are angled down toward the ground and when they extend the blade severs the spear slightly below ground level requiring a stroke length of about 20 inches. Typically the extension stroke takes around 35 to 40 milliseconds.
An optical detection system locates the spears and sends a signal to open the air valve for the cylinder corresponding to the co-ordinates of the spear to be cut. The harvester is moving forward at between 20 and 30 inches per second, and so the blades must cut the spear and get back up out of the way of any spears that are not quite tall enough to harvest.
Asparagus spears emerge from the bed in a random pattern with random heights. At any moment during harvesting there may be as many as 5 or 6 cylinders operating at the same time, or none at all. You might have 10 feet with nary a spear, and 18 spears in the next 24 inches.
Because these cylinders are very fast acting they require high flow rates at a constant stable air pressure. While stroking, the cylinder will be consuming around 165 cubic feet per minute of air. Six cylinders operating at once would require a whopping 990 cubic feet per minute.
With such large swings in flow and rapidly varying air consumption the mechanical air regulator will have a significant variation in the pressure drop, which will have a detrimental affect on the stroke length of the cylinders.
We can, however, use another approach to regulating the air pressure. We can use a switching electronic air pressure regulation scheme. With this approach we replace the mechanical pressure regulator with an on or off electric air valve with a high flow rate.
We can then use an accurate analog pressure transducer to open the valve whenever the pressure drops below the set point, and shut off when the pressure is at or above the set point.
The valve has a very low pressure drop unlike the mechanical regulator. The valve can handle the flow required by multiple cylinders without the air pressure drooping that the mechanical regulators end up with.
There will be small pressure spikes or what is known in electronics as a ripple in the pressure. By properly sizing the manifold I can filter out the small pressure ripples.
About the Author
New Products, Ideas, Inventions: Who invented the electric water heater
Invention help for small inventors: Latest Amazing Scientific Inventions
Inventions, patents, and online marketing: What is a Microcontroller?
My ls400 on air cylinders
Be the first to comment.