Dispensing: Producing Cash, or Just Producing a Mess?
出典: くみこみックス
Grease, silicone, RTV, potting compound, anti-splatter fluid, rust medication dispensing system inhibitor, marking fluids, hot glue. All of these components have at least 1 issue in frequent: theyre dispensed on a everyday basis in quite a few industries across the US, oftentimes with wildly varying degrees of good results. Our firm operates with these fluids regularly, for medication dispensers a wide assortment of clients. In the final six years, weve leaned a lot about dispensing systems and how to apply them to meet the wants of our clients. Right here are a few key components to think about when facing your next dispensing application.
High Pressure or Low?
Time-Pressure vs. Good Displacement
Closing the Loop with Flow Meters
High Pressure or Low?
The viscosity (usually measured in centipoises) of our media will establish the pressure that it requires to move it. For instance, dispensing dots of Cyanoacrylate, (Super Glue) may well need no a lot more then 5-10 PSI, even though flange sealant (RTV) might require 2000 PSI or far more. The precise pressure essential doesnt truly matter, as components are accessible to cover most applications. The important factor is not to mix and match high and low pressure components. Sound apparent, right? However, we see it each day.
Time-Pressure vs. Positive Displacement
The accuracy and consistency of your specific application will ultimately establish your equipment choice, and thereby the strategy of dispensing. In numerous applications where absolute consistency is not needed, one particular of the simplest strategies of dispensing is time-pressure. As the name implies, time-pressure includes opening a valve or orifice for a offered duration to dispense a fluid at a given pressure. This theory holds that repeatedly opening the exact same valve, with the identical fluid, at the very same pressure, for the very same length of time will yield related volumes of dispensed fluids. Based on the distinct valve, method of actuation, and repeatability of the controller or PLC, this strategy can actually yield surprisingly repeatable benefits. Applications that involve large volumes of material such as running a bead, filling a container or void, or spraying glues or grease, respond very nicely to this method. Key elements are the valve, pressure pump or pot, and timer, oftentimes a PLC.
Applications that hinge on a vital quantity of adhesive or other fluid demand a much more controlled method. Applying dots of grease, certain volumes of glue, or exact amounts of an costly compound are principles examples of where good displacement (PD) dispensing equipment is applicable. PD includes filling a chamber with a media and then employing air pressure or other force to move this media downstream to the element. This chamber and a set of examine valves or shut-off plates isolate the major provide of fluid from the part and force the fluid to be delivered in certain packets, or displacements. Principal body sizes combined with fine mechanical adjustments allow for tailoring the volumes of these displacements to match the wants of the particular application.
Closing the LoopFlow Meters
If the approach is totally important, or if the buyer dictates, it may possibly be required to verify the actual amount of fluid dispensed through use of a flow meter. A flow meter is a device that translates fluid flow into an electrical output signal. This signal is usually either pulsed-output or analog. Some examples of flow meters: coriolis, good displacement, turbine, ultrasonic, and doppler. Every single is of a diverse design and is engineered for a particular application. Volume (ccs vs. gallons), flow (continuous vs. intermittent) and viscosity (thick fluids vs. thin), will all influence the variety of meter that is appropriate for your distinct job.
