 | Vivek Engineers #22, 1st Floor, 1st Cross, Adj. to IIMB Compound, Bilekahalli Indl. Area, Bannerghatta Road, Bangalore - 560 076 Ph : 080 - 2648 1309, 4170 1145. Mob : | ||||
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Wednesday 25 November 2020
Installing the EXAIR Model 4908 Dual Cabinet Cooler Hardware Kit
Thursday 19 November 2020
Considerations for Ejecting Parts with an Air Nozzle: Weight and Friction
Exair had a customer wanting to reject a container off a conveyor belt. The container held yogurt, and when an optic detected a reject, they wanted to operate a solenoid to have a nozzle blow the container into a reject bin. They had a range that went from 4 oz. (113 grams) for the small containers to 27 oz (766 grams) for the large. He wanted me to suggest one nozzle for all sizes, as they would automatically regulate the pressure for the full range of products. In looking at the largest size, this container will need the most force to blow off the conveyor. The two factors that affects the force in this type of application is weight and friction. When it comes to friction, it is generally an unknown for customers. So, I was able to help with a couple of things to determine the friction force.
Friction is a dimensionless number that represents the resistance created between two surfaces. We have two types; static friction, ms, and kinetic friction, mk. Static friction is the maximum amount of resistance before the object begins to move or slide. Kinetic friction is the amount of resistance that is created when the object is moving or sliding. So, Static friction is always greater than kinetic friction, ms > mk. For this application, we will use an air nozzle to “shoot” horizontally to hit the rejected product.
Let’s take look at our customer’s application. We have a system to reject a non-conforming part with air. The conveyor has a urethane belt. The container is plastic. For the largest container, they have a weight of 27 oz. (766 grams). Being that the conveyor belt is only 12” (30.5 cm) wide, we can determine that if we get the part moving, it will continue off the belt and into the reject bin. The equation for the maximum amount of force required to move a container is below as Equation 1.
Equation 1
Fs = ms * W
Fs – Static Force in ounces (grams)
ms – Static Friction
W – Weight in ounces (grams)
One way to determine the amount of force is to use a scale similar to a fish scale. The scale should have a maximum indicator to help capture the maximum amount of force. You will have to place the object on the same belt material because different types of materials will create different static forces. Keep the scale perpendicular to the object, and slowly pull on the scale. Once the part begins to move, record the scale reading. For the exercise above, it showed 9.6 oz. (271 grams) of force to move the 27 oz. (766 gram) object.
Another way would be to calculate the static friction, ms. Static friction can be found by the angle at which an object starts to move. By placing the container on a section of supported urethane conveyor belt, you can lift one end until the object starts to slide. The height of the lift can be measured as an angle. As an example, we take 3 feet (0.9 meter) of supported urethane conveyor belt, and we lifted one end to a height of 1 foot (0.3 meters) before the 27 oz (766 gram) container moved. To determine static friction, it is the tangent of that angle that you lifted. With some right triangle trigonometry equations, we get an angle of 19.5o. Thus, ms = tanq or ms = tan(19.5o) = 0.354. If we plug this into Equation 1, we get the following:
Imperial Units SI Units
Fs = ms * W Fs = ms * W
= 0.354 * 27 oz. = 0.354 * 766 grams
= 9.6 oz. of force = 271 grams of force
Now that we have the static force, we want to be slightly higher than that. In looking at the force requirements that are published in the EXAIR catalog, it shows that the model 1126 1” Super Flat Air Nozzle has a 9.8 oz. (278 grams) of force at 80 PSIG (5.5 Bar). This force is measured at a 12” (30.5 cm) distance with a patented .015” (0.38mm) shim. So, this nozzle will be able to slide the largest container into the reject bin.
| Vivek Engineers #22, 1st Floor, 1st Cross, Adj. to IIMB Compound, Bilekahalli Indl. Area, Bannerghatta Road, Bangalore - 560 076 Ph : 080 - 2648 1309, 4170 1145. Mob : | ||||
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Thursday 12 November 2020
Vortex Tubes: What, Why, Where?
The most common questions about Vortex Tubes are “How long have they been around?” and “How do they work?”. These questions are simple enough and answering someone how long Vortex Tubes have been around is the easy answer, Vortex Tubes have been around since 1928 with what may seem as an accidental existence by the developer George Ranque.
As to how they work, these are a phenomenon of physics and the theoretical math behind them has yet to be proven and set in stone. They have been called various names such as “Maxwell’s Demon” which posited that a demon was splitting the hot and cold air molecules prior to leaving the Vortex Tube. They have also been referred to as the “Ranque Vortex Tube”, “Hilsch Tube”, and the “Ranque-Hilsch Tube” which highlight some of the prominent people in developing vortex tubes.
WHAT: EXAIR defines a Vortex Tube within our catalog as “a low cost, reliable, maintenance free solution to a variety of industrial spot cooling problems. Using an ordinary supply of compressed air as a power source, vortex tubes create two streams of air, one hot and one cold, with no moving parts.”
The scope of Vortex Tubes include being able to produce temperatures from -50 degrees to 260 degrees Fahrenheit with flow rates from 1 to 150 SCFM and refrigeration up to 10,200 Btu/hr. Temperatures, flows and cooling power can be easily adjusted with the control valve located on the “hot” end of the tube.
WHY: EXAIRs’ Vortex Tubes offer low cost and reliable solutions primarily for product cooling and sometimes heating. Constructed of stainless steel, our vortex tubes are resistant to corrosion and oxidation providing for years of reliable maintenance-free operation. Vortex tubes operate with a source of compressed air with no moving parts or electricity.
EXAIR offers two series of vortex tubes. The 32XX series is “Maximum Refrigeration (cooling) and is typically used for process cooling, part cooling or chamber cooling. The 34XX series provide lowest cold temperatures at low cold airflow and typically used in cooling lab samples and circuit testing.
EXAIR offers a cooling kit with interchangeable generators that are easily changed so you can experiment and find what temperature and airflow works best for your application.
WHERE: There are many uses for EXAIR Vortex Tubes including but not limited to cooling electronics, machining operations, CCTV cameras, soldered parts, gas samples, heat seals, environmental chambers, ultrasonic weld horns, welds and setting hot melts.
The history of EXAIR Vortex Tubes and the variety of uses has derived new products designed for specific applications like our Spot Coolers and Cabinet Coolers. These items can be found in our catalog or at www.vivekengineers.net
| Vivek Engineers #22, 1st Floor, 1st Cross, Adj. to IIMB Compound, Bilekahalli Indl. Area, Bannerghatta Road, Bangalore - 560 076 Ph : 080 - 2648 1309, 4170 1145. Mob : | ||||
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Wednesday 11 November 2020
What Is The Gen4® Ion Air Gun?
EXAIR's Gen4 Ion Air Gun combines incredibly fast static decay rates with low compressed air consumption. It is the ideal way to remove static, contaminants and dust from three dimensional parts prior to assembly, packaging, painting or finishing. The Gen4 Ion Air Gun neutralizes static electricity and cleans at distances up to 15 feet (4.6m).
The Gen4 Ion Air Gun is quiet, lightweight and features a hanger hook for easy storage. The 10 foot (3m) armored and electromagnetic shielded power cable is extremely flexible, designed for rugged industrial use.
<<CLICK HERE>> to visit our website
| Vivek Engineers #22, 1st Floor, 1st Cross, Adj. to IIMB Compound, Bilekahalli Indl. Area, Bannerghatta Road, Bangalore - 560 076 Ph : 080 - 2648 1309, 4170 1145. Mob : | ||||
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Monday 9 November 2020
Are EXAIR’s Hoses and Tubes Right For You?
Are you tired of ducking and dodging hard pipe everywhere? Do you need something more mobile for your compressed air? Then EXAIR Hoses and Tubes might be a solution for you. EXAIR offers a variety of hoses and tubes in different styles designed to work with our products without affecting performance. These products simplify the use, setup, and integration of our various products into your process. Normally if you were to buy hoses you would need to determine the proper diameters, pressure ratings, and/or end fittings to best fit the item in use. This is all unnecessary when purchasing EXAIR’s Hoses and tubes for EXAIR products since everything is sized and properly rated to be used with our products. So, ask our Application Engineers if EXAIR Hoses and Tubes are right for you.
These hoses are used with our Air Operated Conveyors or Line Vacs which are used to convey material from point A to point B. The hose can be mounted on either side of the Line Vac using the properly sized hose clamp that comes with it. The Conveyance hose is made out of a durable PVC semi-flexible material in sizes from ¾” I.D. to 3” I.D. to match our Line Vac sizes. They also come in lengths up to 50’ in increments of 10’.
When it comes to getting compressed air to our safety air guns, we offer a series of abrasion-resistant nylon Coiled Hoses. The coiled hose comes in a 12’ long length and comes in 3 sizes; these sizes are 1/8” NPT, ¼” NPT, and 3/8” NPT to attach right to EXAIR’s Safety Air Guns. The hoses also include swivel fittings to make for easier uncoiling. The coiled design makes it easy to reach around the work area and retract back to the substation. With the right size hose Coiled Hoses can supply the required amount of compressed air with minimal amount of pressure drop.
Compressed Air Hose can be used to reach equipment from overhead or near equipment. These hoses are made with synthetic rubber and comes in 3/8” I.D. and ½” I.D… Lengths up to 50’ long can be provided and the hoses are rated for up to 250 psig air pressure. These hoses can provide lasting protection from ozone, weathering and temperatures up to 158oF. They also come with two male ends in ¼” NPT or ½” NPT.
Bendable and flexible, the stay set hose allows for manual positioning of your compressed air product. Equipped with “memory” function, the hose will not creep or droop until it is physically moved. The Stay Set Hose comes in lengths from 6” to 36” in length, and they offered in a combination of 1/8” and ¼” MNPT connections. These hoses are rated for 250 psig and are made of a reinforced rubber.
Vacuum Tubing:
When it comes down to our E-Vac product line, EXAIR offers vacuum tubing to be used along with the unit. This tubing is made from polyurethane and comes in 1/8” O.D. and 3/8” O.D. up to 50’ in length in increments of 10’.
If you have any questions about compressed air systems or want more information on any of EXAIR’s products, give us a call, we have a team of Application Engineers ready to answer your questions and recommend a solution for your applications.
<<CLICK HERE>> to visit our website
| Vivek Engineers #22, 1st Floor, 1st Cross, Adj. to IIMB Compound, Bilekahalli Indl. Area, Bannerghatta Road, Bangalore - 560 076 Ph : 080 - 2648 1309, 4170 1145. Mob : | ||||
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Wednesday 4 November 2020
EasySwitch Wet-Dry Vac
When changing over other wet/dry vacuums, whether it is a traditional electric vacuum like you may have at home or another pneumatic industrial vacuum on the market, the switchover process is cumbersome. There are typically fasteners or retainers that are necessary to hold the filters in place, filters can be poor quality and get damaged easily. Small parts needed to hold filters in place like springs or retainer nuts can easily be lost, hard to manipulate and take additional time changing from liquid to dry modes or vice-versa. With the EasySwitch, the only fastener is a rubber latch that is attached to the filter hatch cover. This means operators can’t lose parts because they are all attached to the EasySwitch Lid. To convert from a dry vacuum to a wet vacuum the steps are simple.
- Turn off the compressed air and unlatch the rubber handle. This makes it possible to complete step two.
- Lift the filter hatch lid and let it rest on the hinge stop. This is all designed to be robust enough to easily support the weight of the EasySwitch unit as well as the air hose attached to it.
- Lift the filter, whether it is the HEPA rated filter or the standard filter, up and out of the lid.
- Close the filter hatch lid onto the edge gasket that stays firmly in place.
- Latch the rubber handle/latch back into place and start processing liquid as needed.<<CLICK HERE>> to visit our websiteVivek Engineers
#22, 1st Floor, 1st Cross, Adj. to IIMB Compound, Bilekahalli Indl. Area,
Bannerghatta Road, Bangalore - 560 076Ph : 080 - 2648 1309, 4170 1145.
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