For a long time, the use of hydraulic power in industrial processes has been associated with its traditional benefits: high power density, precise control, and long-term performance. Yet these advantages typically come hand-in-hand with equal numbers of potential drawbacks: excess noise, heat generation, and inefficient energy allocation. As we move forward, technologically advanced industrial equipment now requires hydraulic systems that can provide quieter, more economical and more efficient solutions.
Where wasted energy and resulting carbon emissions might have previously been seen as inconsequential, a switch to a tightly-modulated hydraulic system fitted for specific tasks is essential in today’s globally competitive and eco-conscious economy. With various industrial machinery (including die casting machines, presses and plastic injection moulding machinery) placing different demands on hydraulic control, you may wonder: how can highly complex hydraulics systems be adapted for individual requirements?
Matching optimum performance to size requirements
Taking one application example into consideration – injection moulding machinery (used in rubber, thermoplastic and other polymer industries); Parker has developed an immersed servo motor pump system with the aim of enhancing hydraulic reliability and reducing energy consumption. Hydraulics have long been utilised in this industrial process; with a hydraulic power unit (HPU) as the source and with very large capacity pumps and motors to ensure steady performance. However, Parker’s solution brings in three separate elements (a pump, a servo motor and a drive for control) to match flow rate to the particular requirement, primarily through the rotational speed of the motor.
From opening and closing moulds to plasticising and injecting, there are many auxiliary movements – often occurring in parallel – that take place within plastics machinery. They must be supplied centrally with the required flow and pressure over the briefest of cycle times. Controlled by the speed and torque of servo motor as part of Parker’s solution, careful flow and pressure regulation allows for greater energy efficiency. With the high maximum speed of the small vane pump, a very high volume flow can be achieved with the smallest size. Therefore, component size can be optimised to suit their need and investment costs reduced.Selecting a complete solution
Alongside hydraulic systems available for injection moulding machinery, Parker offers a full-system solution, the Drive Controlled Pump (DCP), which combines a versatile range of AC drive controllers, motors and pumps into tailored packages for the most diverse applications. With the incorporation of an alternating current drive controller, the speed range can be set in advance to a predefined cycle. Whether for a long or short duty cycle, the precise amount of hydraulic power required can be calculated for any particular point in time. When selecting between vane pumps or axial piston pumps, factors of output, required minimum and maximum speeds can be assessed and taken into consideration.
Parker’s DriveCreator dimensioning software tool enables the creation of an energy-efficient, speed-controlled, electrohydraulic DCP solution, while its start-up tool simplifies the task of putting the DCP into operation once selected. To discover more about recommended combinations of individual components, please click here.
This article was contributed by Vincent Sinot, key account manager, Parker Sales Company France.
The world of thermal interface materials continues to evolve as the cooling requirements for applications in the automotive, consumer, medical and aerospace markets continue to demand lower prices and higher performance. As each new product generation requires higher power in smaller packages the challenges associated with thermal management become more intense.
The criteria which engineers use to select these thermal interface materials will by necessity include the thermal conductivity. However other properties of the material such as its hardness, dielectric strength, dielectric constant, compression set, cut-through resistance, toughness, tensile strength and resistance to chemical and environmental attack is equally important, as well as their suitability for rework or repair.
So which is the best product for your application? Here are the top four thermal interface materials.Dispensable gels
Highly conformable, dispensable, one and two component, pre-cured, or cure-in-place silicone, such as Chomerics THERM-A-GAP® gels are ideal for filling large and uneven gaps in electronics assemblies. The viscoelastic paste is a form stable, cured silicone material that takes considerably less force to deform during assembly than traditional form stable gap fillers. This characteristic helps avoid placing excessive stress on component solder joints and leads that can result in either premature failure of the device or damage to the circuit board on which it is placed.
Parker Chomerics has also developed pre-cured and cure-in-place non-silicone gels to resolve the issues of silicone contamination in some applications. This unique material has similar thermal and physical properties to the silicone gel without the problems silicone can sometimes cause.Gap filling pads
Chomerics THERM-A-GAP® silicone based gap filler pads have supported the utilization of equipment enclosures or chassis as heat dissipaters in place of costly and heavy dedicated heat sinks. By fitting a piece of soft gap filling material between a device requiring thermal management and an enclosure, heat can be channeled away effectively. Because of the typically large surface area of the equipment enclosure coupled to the fact that it provides a direct thermal path to the lower temperature of the ‘outside world’, adopting this approach can also negate the need for fans where they were previously required for a specific design.
Gap filling pad materials are available in a wide range of thicknesses that now extends beyond 5mm, allowing even very large gaps to be bridged. Their extremely soft nature means that large mechanical tolerances can be taken up with relatively low assembly forces being used. Accurate blending of silicon-based gap fillers, using a range of materials with different thermal conductivities, results in a choice that allows designers to select a material that accurately meets the thermal requirements of their specific design.Insulator pads
These are generally very thin materials (around 0.25mm) that comprise a silicone elastomer blended with a thermally conductive filler. Fiber glass cloth is commonly used to reinforce the material and provide some resistance to cut through that would reduce the electrical isolating properties of the material. There is a wide choice of CHO-THERM® insulator pad materials available.
These use a variety of different fillers that provide a wide range of thermal and electrical performance levels. Options such as low-tack adhesive coatings, pressure sensitive adhesives, and tabbed release liners, which aid assembly, may also be specified.Adhesive tapes
Thermally conductive tapes, such as Chomerics THERMATTACH® provide effective alternatives to mechanical fasteners such as screws, clips and rivets for bonding heat sinks to either ceramic or metal device packages.
The benefits include, lower assembly times, smaller footprints, and reduced material costs.
The popularity of air motors is on the rise as a result of their many advantages. However, not all pneumatic motors are made the same, so choosing the right one for your application can prove the difference between project success and failure. For the purposes of this blog post we will focus on vane-type air motors as they are more suitable for regular operating cycles, where speeds of no more than 10,000 rpm are required.
To provide an example of the differences between air motors currently available on the market, consider the following. Across modern industry, oil and oil mist are avoided wherever possible to ensure a clean work environment and comply with H&S regulations. With this thought in mind, you should select an air motor from a manufacturer that actively avoids using components which require lubrication. The P1V series from Parker, for example, is equipped with vanes for intermittent lubrication-free operation at power below 1000 watts, which is the most common application of air motors.
For those of you working on food-grade projects and other hygienic/high cleanliness applications, check that external components are made from stainless steel. In our P1V-S range, for example, the air motor and planetary reduction gear are built into a polished stainless steel housing. Moreover, the output shaft, which is also made of polished stainless steel, is sealed by a fluorocarbon (FKM) rubber seal. Note that this design means the motors can be deployed under water to a depth of around 8 metres. These drive solutions are particularly suitable for use in industrial agitators and mixers, as used in the paint, food and pharmaceutical industries.Determine the required power of motor
Once the physical aspects have been decided, you can set about calculating the required power of the air motor. Many factors come into play here, including direction of rotation, air pressure working range, air class quality and, principally, expected torque and speed under load.
Basic power can be calculated using an established formula: P = M x n / 9550. Here, P is power output in kW, M is nominal torque in Nm, and n is nominal speed in rpm. As a tip, you should always select a motor which is slightly too fast and powerful, then regulate its speed by throttling the flow and torque by reducing the pressure to achieve the optimum working point. Also, ensure that the pressure supplied to the inlet port of the motor is correct, so it can work at maximum capacity. If the valve supplying a large motor is too small or the supply line is underspecified, you might find that the pressure at the inlet port is so low that the motor cannot function.
Further factors determining the selection of an air motor include the position in which it will be used. Also, will standard or spring-loaded vanes be required? Spring loaded vanes are selected to ensure they remain pressed against the cylinder when the motor stops, and when working at low speeds.
Will you require an integrated brake? If so, it’s worth noting that brake motors must only ever be supplied with unlubricated air, otherwise there is a risk of oil from the supply air getting into the brake unit, resulting in poor brake performance or no braking effect whatsoever.More information
Watch in this video Parker’s latest range of air motors and the benefits they can bring to your project.
Article contributed by Franck Roussilon, product manager, Actuators Europe, Parker Hannifin, Pneumatic Division Europe
Clinical and analytical laboratories are under constant pressure to increase throughput. Throughput is the amount of material or items passing through a system. In this case, it’s the analyzing a higher volume of samples per day. This brings several advantages: reduced cost per sample, decreased sample turnaround time, fewer instruments needed, and reduction of laboratory space required. These reasons, among others, are why laboratory managers are pushing instrument manufactures to increase their throughput.
This article looks into what limits the volume of throughput in labs, and how breakthrough advancements in valve technology can provide the above-stated improvements for clinical and analytical labs.
What factors slow throughput?
The time it takes to perform analysis in the labs can greatly decrease throughput. Instrument manufacturers continually search for ways to increase the process speed of analyzing samples so larger qualities of the sample can be analyzed each day. One way to solve this problem is by reducing the length of fluid passageways so the liquids spend less time in transit. This creates less clean up later. Reducing the number of valves needed and using smaller valves that can be placed closer together are two ways to reduce transit times.
The second challenge to instrument manufactures is to ensure no carryover of one sample or reagent into another. This is of great concern to lab managers because the integrity of the sample will be compromised, and the analysis will be flawed. Lab technicians spend lots of time washing out valves to ensure carryover doesn’t occur. The washing process slows the system down and generates liquid waste which can be very costly to dispose of. These factors are why instrument manufacturers have focused on reducing carryover in sampling and reagent circuits.
How to increase throughput?
The Precision Fluidics Division of Parker Hannifin Corporation interviewed many laboratory instrument manufacturers to understand their needs. The manufactures expressed the need for a valve with low carryover with low internal volume, and the ability to reduce the complexity for fluidic circuits. Based on this feedback, Precision Fluidics developed the Parker Ultra Low Carryover Valve. This valve offers best in class carryover performance and allows its users to replace two valves with one. The patented pending design offers a very small internal volume of 13.6 uL from diaphragm seal to the outlet port.
"Today's valve offerings have serious limitations in reducing carryover. We are introducing a new valve that can improve throughput by reducing carryover while offering features that also provide increased efficiency and speed in fluid circuits.
— Don McNeil, product manager, Parker Precision Fluidics Division
Parker tested the Ultra Low Carryover Valve against pinch and rocker isolation valves from three leading manufacturers and compared their respective performances to the Parker Ultra Low Carryover Valve. The models selected were those with capabilities of achieving the lowest levels of carryover among their respective product lines.
During testing these systems were also set and optimized to achieve the best carryover performance and each valve were of a three-way configuration. For the test, each was filled with Brilliant Blue dye, switched to the second channel, and a precision syringe pump was used to provide flow through the valve. The absorbance was measured until it was no longer detectable.
The data below shows Parker Ultra Low Carryover Valve has a clear advantage in washing out faster than the industry-leading pinch and rocker isolation valves. In cleaning to the 10 PPM level the Parker Ultra Low Carryover Valve cleans out 65% faster and with 65% less volume than the next closest competitor, which uses an internal pinch design.
This means by using the Parker Ultra Low Carry Over Valve in the original equipment manufacturer (OEM) design, you can increase throughput while reducing liquid waste.
Another feature of the Parker Ultra Low Carryover is the capability of having four different states of operation. A traditional three-way valve can flow through channel A or channel B, but the Ultra Low Carry Over Valve can close off both simultaneously or open both simultaneously. This makes it possible to replace a common pairing of a two way and three-way valve in a series with a single Parker Ultra Low Carryover valve.
Design more efficient products to increase throughput
In conclusion, the new Parker Ultra Low Carryover will allow laboratory instrument manufacturers to design more efficient products to increase throughput in clinical and analytical chemistry labs. The following summarizes how The Ultra Low Carryover increases throughput:
Our applications engineering team is always available to provide recommendations and customize equipment to customer specifications.
To learn more, visit Parker Hannifin’s Precision Fluidics Division or call 603-595-1500 to speak with an engineer.
Don McNeil is the market development manager at Parker Precision Fluidics. Don has over thirty years of experience working in product management for Clinical Diagnostics and Analytical Chemistry companies. He holds a Bachelor's degree in Biochemistry and an MBA.
Other related articles on this topic:
Parker Global publishes news from inside the company that focuses on our efforts to be a good corporate citizen around the world and illustrate our commitment to deliver on our brand promise to partner with our customers to increase their productivity and profitability.
ParkerStore MRO Authority is your resource for the Maintenance, Repair and Overhaul space. Our goal is to improve your productivity and profitability with information on ParkerStore Service Points nearest you, Parker product and Technology Centers (Hydraulic, Pneumatic, Seal) updates, expert tips, troubleshooting, how-to articles and the latest industry news. We're ready to help you; not just with critical replacement parts, but solutions. And it's important those solutions are available where you are - onsite and off. If you know us already, you know that getting you back to work is our "thing". If you're not working with your local Distributor and ParkerStore, please read more.