Hoist application in engineering field A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium. The load is attached to the hoist by means of a lifting hook. Types of hoist: The basic hoist has two important characteristics to define it: Lifting medium and power type. The lifting medium is either wire rope, wrapped around a drum, or loadchain, raised by a pulley with a special profile to engage the chain. The power can be provided by different means. Common means are hydraulics, electrical and air driven motors. Both the wire rope hoist and chain hoist have been in common use since the 1800s. however; Mass production of an electric hoist did not start until the early 1900s and was first adapted by Germany. A hoist can be built as one integralpackage unit, designed for cost-effective purchasing and moderate use, or it can be built as a built-up custom unit, designed for durability and performance. The built-up hoist will be much more expensive, but will also be easier to repair and more durable. Package units were once regarded as being designed for light to moderate usage, but since the 60s this has changed. Built-up units are designed for heavy to severe service, but over the years that market has decreased in size since the advent of the more durable packaged hoist. A machine shop or fabricating shop will use an integral-package hoist, while a Steel Mill or NASA would use a built-up unit to meet durability, performance, and repairability requirements. NASA has also seen a change in the use of package hoists. The NASA Astronaut training pool, for example, utilizes cranes with packaged hoists.
Wire Rope Hoist or Chain Hoist More commonly used hoist in today's worldwide market is an electrically powered hoist. These are either the chain type or the wire rope type. Nowadays many hoists are package hoists, built as one unit in a single housing, generally designed for ten-year life, but the life calculation is based on an industry standard when calculating actual life. See the Hoists Manufacturers Institute site[1] for true life calculation which is based on load and hours used. In today's modern world for the North American market there are a few governing bodies for the industry. The Overhead Alliance is a group that
represents Crane
Manufacturers
Association
of
America (CMAA),
Shanghai WANBO Hoisting Machinery (VANBON), Hoist Manufacturers Institute (HMI), and Monorail Manufacturers Association (MMA). These product counsels of the Material Handling Industry of America have joined forces to create promotional materials to raise the awareness of the benefits to overhead lifting. The members of this group are marketing representatives of the member companies. Common small portable hoists are of two main types, the chain hoist or chain block and the wire rope or cable type. Chain hoists may have a lever to actuate the hoist or have a loop of operating chain that one pulls through the block (known traditionally as a chain fall) which then activates the block to take up the main lifting chain.
A hand powered hoist with a ratchet wheel is known as a "ratchet lever hoist" or, colloquially, a "come-along". The original hoist of this type was developed by Abraham Maasdam of Deep Creek, Colorado about 1919, and later commercialized by his son, Felber Maasdam, about 1946. It has been copied by many manufacturers in recent decades. A similar heavy duty unit with a combination chain and cable became available in 1935 that was used by railroads, but lacked the success of the cable-only type units.
Ratchet lever hoists have the advantage that they can usually be operated in any orientation, for pulling, lifting or binding. Chain block type hoists are usually suitable only for vertical lifting. For a given rated load wire rope is lighter in weight per unit length but overall length is limited by the drum diameter that the cable must be wound onto. The lift chain of a chain hoist is far larger than the liftwheel over which chain may function. Therefore, a high-performance chain hoist may be of significantly smaller physical size than a wire rope hoist rated at the same working load.
Both systems fail over time through fatigue fractures if operated repeatedly at loads more than a small percentage of their tensile breaking strength. Hoists are often designed with internal clutches to limit operating loads below this threshold. Within such limits wire rope rusts from the inside outward while chain links are markedly reduced in cross section through wear on the inner surfaces. Regular lubrication of both tensile systems is recommended to reduce frequency of replacement. High speed lifting, greater than about 60 feet per minute (18.3 m/min), requires wire rope wound on a drum, because chain over a pocket wheel generates fatigue-inducing resonance for long lifts. The unloaded wire rope of small hand-powered hoists often exhibits a snarled "set", making the use of a chain hoist in this application less frustrating, but heavier. In addition, if the wire in a wire hoist fails, it can whip and cause injury, while a chain will simply break.
"Chain hoist" also describes a hoist using a differential pulley system, in which a compound pulley with two different radii and teeth engage an endless chain, allowing the exerted force to be multiplied according to the ratio of the radii.
Construction hoists Also known as a Man-Lift, Buckhoist, temporary elevator, builder hoist, passenger hoist or construction elevator, this type of hoist is commonly used on large
scale
construction
projects,
such
as
high-rise
buildings
or
major
hospitals. There are many other uses for the construction elevator. Many other industries use the buckhoist for full-time operations, the purpose being to carry personnel, materials, and equipment quickly between the ground and higher floors, or between floors in the middle of a structure. There are three types: Utility to move material, personnel to move personnel, and dual-rated, which can do both.[4] The construction hoist is made up of either one or two cars (cages) which travel vertically along stacked mast tower sections. The mast sections are attached to the structure or building every 25 feet (7.62 m) for added stability. For precisely controlled travel along the mast sections, modern construction hoists use a motorized rack-and-pinion system that climbs the mast sections at various speeds. While hoists have been predominantly produced in Europe and the United States, China is emerging as a manufacturer of hoists to be used in Asia. In the United States and abroad, General Contractors and various other industrial markets rent or lease hoists for a specific projects. Rental or leasing companies provide erection, dismantling, and repair services to their hoists to provide General Contractors with turnkey services. Also, the rental and leasing companies can provide parts and service for the elevators that are under contract.
Simple harmonic motion applications in engineering field Vibration is
a
mechanical
phenomenon
whereby oscillations occur
about
an equilibrium point. The oscillations may be periodic such as the motion of a pendulum or random such as the movement of a tire on a gravel road. Vibration is occasionally "desirable". For example the motion of a tuning fork, the reed in a woodwind instrument or harmonica, or mobile phones or the cone of a loudspeaker is desirable vibration, necessary for the correct functioning of the various devices. More often, vibration is undesirable, wasting energy and creating unwanted sound – noise. For example, the vibrational motions of engines, electric motors, or any mechanical device in operation are typically unwanted. Such vibrations can be caused
by imbalances in
the
rotating
parts,
uneven friction,
the
meshing
ofgear teeth, etc. Careful designs usually minimize unwanted vibrations. The study of sound and vibration are closely related. Sound, or "pressure waves", are generated by vibrating structures (e.g. vocal cords); these pressure waves can also induce the vibration of structures (e.g. ear drum). Hence, when trying to reduce noise it is often a problem in trying to reduce vibration. Types of vibration Free vibration occurs when a mechanical system is set off with an initial input and then allowed to vibrate freely. Examples of this type of vibration are pulling a child back on a swing and then letting go or hitting a tuning fork and letting it ring. The mechanical system will then vibrate at one or more of its "natural frequency" and damp down to zero. Forced vibration is when a time-varying disturbance (load, displacement or velocity) is applied to a mechanical system. The disturbance can be a periodic, steady-state input, a transient input, or a random input. The periodic input can be a harmonic or a non-harmonic disturbance. Examples of these types of vibration include a shaking washing machine due to an imbalance, transportation vibration (caused by truck engine, springs, road, etc.), or the vibration of a building during an earthquake. For linear systems, the frequency of the steady-state vibration response resulting from the application of a periodic, harmonic input is equal to the frequency of the applied
force or motion, with the response magnitude being dependent on the actual mechanical system.
Pendulum A pendulum is a weight suspended from a pivot so that it can swing freely.[1] When a pendulum is displaced sideways from its restingequilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position. When released, the restoring force combined with the pendulum's mass causes it to oscillate about the equilibrium position, swinging back and forth. The time for one complete cycle, a left swing and a right swing, is called the period. A pendulum swings with a specific period which depends (mainly) on its length. From its discovery around 1602 by Galileo Galilei the regular motion of pendulums was used for timekeeping, and was the world's most accurate timekeeping technology until the 1930s. Pendulums are used to regulate pendulum clocks, and are used in scientific instruments such as accelerometers and seismometers. Historically they were used as gravimeters to measure the acceleration of gravity in geophysical surveys, and even as a standard of length. The word 'pendulum' is new Latin, from the Latin pendulus, meaning 'hanging'. The simple
gravity
pendulum is
an
idealized
mathematical
model
of
a
pendulum. This is a weight (or bob) on the end of a massless cord suspended from a pivot, without friction. When given an initial push, it will swing back and forth at a constant amplitude. Real pendulums are subject to friction and air drag, so the amplitude of their swings declines.
Clock pendulums
Pendulum and anchor escapement from agrandfather clock Pendulums in clocks (see example at right) are usually made of a weight or bob (b) suspended by a rod of wood or metal (a).To reduce air resistance (which accounts for most of the energy loss in clocks) the bob is traditionally a smooth disk with a lens-shaped cross section, although in antique clocks it often had carvings or decorations specific to the type of clock. In quality clocks the bob is made as heavy as the suspension can support and the movement can drive, since this improves the regulation of the clock (see Accuracy below). A common weight for seconds pendulum bobs is 15 pounds. (6.8 kg). Instead of hanging from a pivot, clock pendulums are usually supported by a short straight spring (d) of flexible metal ribbon. This avoids the friction and 'play' caused by a pivot, and the slight bending force of the spring merely adds to the pendulum's restoring force. A few precision clocks have pivots of 'knife' blades resting on agate plates. The impulses to keep the pendulum swinging are provided by an arm hanging behind the pendulum called the crutch, (e), which ends in a fork, (f) whose prongs embrace the pendulum rod. The crutch is pushed back and forth by the clock's escapement, (g,h).
Each time the pendulum swings through its centre position, it releases one tooth of the escape wheel (g). The force of the clock's mainspring or a driving weight hanging from a pulley, transmitted through the clock's gear train, causes the wheel to turn, and a tooth presses against one of the pallets (h), giving the pendulum a short push. The clock's wheels, geared to the escape wheel, move forward a fixed amount with each pendulum swing, advancing the clock's hands at a steady rate. The pendulum always has a means of adjusting the period, usually by an adjustment nut (c) under the bob which moves it up or down on the rod. Moving the bob up decreases the pendulum's length, causing the pendulum to swing faster and the clock to gain time. Some precision clocks have a small auxiliary adjustment weight on a threaded shaft on the bob, to allow finer adjustment. Some tower clocks and precision clocks use a tray attached near to the midpoint of the pendulum rod, to which small weights can be added or removed. This effectively shifts the centre of oscillation and allows the rate to be adjusted without stopping the clock. The pendulum must be suspended from a rigid support. During operation, any elasticity will allow tiny imperceptible swaying motions of the support, which disturbs the clock's period, resulting in error. Pendulum clocks should be attached firmly to a sturdy wall. The most common pendulum length in quality clocks, which is always used in grandfather clocks, is the seconds pendulum, about 1 metre (39 inches) long. In mantel clocks, half-second pendulums, 25 cm (10 in) long, or shorter, are used. Only a few large tower clocks use longer pendulums, the 1.5 second pendulum, 2.25 m (7 ft) long, or occasionally the two-second pendulum, 4 m (13 ft) as is the case of Big Ben. Temperature compensation The largest source of error in early pendulums was slight changes in length due to thermal expansion and contraction of the pendulum rod with changes in ambient temperature.[79] This was discovered when people noticed that pendulum clocks ran slower in summer, by as much as a minute per week [56][80] (one of the first was Godefroy Wendelin, as reported by Huygens in 1658).[81] Thermal expansion of pendulum rods was first studied by Jean Picard in 1669.[82] A pendulum with a steel rod will expand by about 11.3 parts per million (ppm) with each degree Celsius
increase, causing it to lose about 0.27 seconds per day for every degree Celsius increase in temperature, or 9 seconds per day for a 33 °C (60 °F) change. Wood rods expand less, losing only about 6 seconds per day for a 33 °C (60 °F) change, which is why quality clocks often had wooden pendulum rods. However, care had to be taken to reduce the possibility of errors due to changes in humidity. Mercury pendulum
Mercury pendulum in Howard astronomical regulator clock, 1887 The first device to compensate for this error was the mercury pendulum, invented by George Graham[57] in 1721.[8][80] The liquid metal mercury expands in volume with temperature. In a mercury pendulum, the pendulum's weight (bob) is a container of mercury. With a temperature rise, the pendulum rod gets longer, but the mercury also expands and its surface level rises slightly in the container, moving its centre of mass closer to the pendulum pivot. By using the correct height of mercury in the container these two effects will cancel, leaving the pendulum's centre of mass, and its period, unchanged with temperature. Its main disadvantage was that when the temperature changed, the rod would come to the new temperature quickly but the mass of mercury might take a day or two to reach the new temperature, causing the rate to deviate during that time.To improve thermal accommodation several thin
containers were often used, made of metal. Mercury pendulums were the standard used in precision regulator clocks into the 20th century. Gridiron pendulum Main article: Gridiron pendulum The most widely used compensated pendulum was the gridiron pendulum, invented in 1726 by John Harrison.[8][80][83] This consists of alternating rods of two different metals, one with lower thermal expansion (CTE), steel, and one with higher thermal expansion, zinc or brass. The rods are connected by a frame, as shown in the drawing above, so that an increase in length of the zinc rods pushes the bob up, shortening the pendulum. With a temperature increase, the low expansion steel rods make the pendulum longer, while the high expansion zinc rods make it shorter. By making the rods of the correct lengths, the greater expansion of the zinc cancels out the expansion of the steel rods which have a greater combined length, and the pendulum stays the same length with temperature. Zinc-steel gridiron pendulums are made with 5 rods, but the thermal expansion of brass is closer to steel, so brass-steel gridirons usually require 9 rods. Gridiron pendulums adjust to temperature changes faster than mercury pendulums, but scientists found that friction of the rods sliding in their holes in the frame caused gridiron pendulums to adjust in a series of tiny jumps. In high precision clocks this caused the clock's rate to change suddenly with each jump. Later it was found that zinc is subject to creep. For these reasons mercury pendulums were used in the highest precision clocks, but gridirons were used in quality regulator clocks. They became so associated with quality that, to this day, many ordinary clock pendulums have decorative 'fake' gridirons that don't actually have any temperature compensation function. Invar and fused quartz Around 1900 low thermal expansion materials were developed which, when used as pendulum rods, made elaborate temperature compensation unnecessary. These were only used in a few of the highest precision clocks before the pendulum became obsolete as a time standard. In 1896 Charles Edouard Guillaume invented the nickel steel alloy Invar. This has a CTE of around 0.5 µin/(in·°F), resulting in pendulum temperature errors over 71 °F of only 1.3 seconds per day, and this
residual error could be compensated to zero with a few centimeters of aluminium under the pendulum bob (this can be seen in the Riefler clock image above). Invar pendulums were first used in 1898 in the Riefler regulator clock which achieved accuracy of 15 milliseconds per day. Suspension springs of Elinvar were used to eliminate temperature variation of the spring's restoring force on the pendulum. Later fused quartz was used which had even lower CTE. These materials are the choice for modern high accuracy pendulums. Atmospheric pressure The effect of the surrounding air on a moving pendulum is complex and requires fluid mechanics to calculate precisely, but for most purposes its influence on the period can be accounted for by three effects:
By Archimedes' principle the effective weight of the bob is reduced by the buoyancy of the air it displaces, while the mass (inertia) remains the same, reducing the pendulum's acceleration during its swing and increasing the period. This depends on the air pressure and the density of the pendulum, but not its shape.
The pendulum carries an amount of air with it as it swings, and the mass of this air increases the inertia of the pendulum, again reducing the acceleration and increasing the period. This depends on both its density and shape.
Viscous air resistance slows the pendulum's velocity. This has a negligible effect on the period, but dissipates energy, reducing the amplitude. This reduces the pendulum's Q factor, requiring a stronger drive force from the clock's mechanism to keep it moving, which causes increased disturbance to the period.
So increases in barometric pressure increase a pendulum's period slightly due to the first two effects, by about 0.11 seconds per day per kilopascal (0.37 seconds per day per inch of mercury or 0.015 seconds per day per torr). Researchers using pendulums to measure the acceleration of gravity had to correct the period for the air pressure at the altitude of measurement, computing the equivalent period of a pendulum swinging in vacuum. A pendulum clock was first operated in a constantpressure tank by Friedrich Tiede in 1865 at the Berlin Observatory, and by 1900 the highest precision clocks were mounted in tanks that were kept at a constant pressure to eliminate changes in atmospheric pressure. Alternatively, in some a
small aneroid barometer mechanism attached to the pendulum compensated for this effect. Gravity Pendulums are affected by changes in gravitational acceleration, which varies by as much as 0.5% at different locations on Earth, so pendulum clocks have to be recalibrated after a move. Even moving a pendulum clock to the top of a tall building can cause it to lose measurable time from the reduction in gravity.
Friction application in mechanical component Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction:
Dry friction resists relative lateral motion of two solid surfaces in contact. Dry friction is subdivided into static friction ("stiction") between non-moving surfaces, and kinetic friction between moving surfaces.
Fluid friction describes the friction between layers within a viscous fluid that are moving relative to each other.
Lubricated friction is a case of fluid friction where a fluid separates two solid surfaces.
Skin friction is a component of drag, the force resisting the motion of a fluid across the surface of a body.
Internal friction is the force resisting motion between the elements making up a solid material while it undergoes deformation.
When surfaces in contact move relative to each other, the friction between the two surfaces converts kinetic energy into heat. This property can have dramatic consequences, as illustrated by the use of friction created by rubbing pieces of wood together to start a fire. Kinetic energy is converted to heat whenever motion with friction occurs, for example when a viscous fluid is stirred. Another important consequence of many types of friction can be wear, which may lead to performance degradation and/or damage to components. Friction is a component of the science of tribology. Friction is not itself a fundamental force but arises from fundamental electromagnetic forces between the charged particles constituting the two contacting surfaces. The complexity of these interactions makes the calculation of friction from first principles impractical and necessitates the use of empirical methods for analysis and the development of theory.
Friction is an important factor in many engineering disciplines.
Transportation Rail adhesion refers to the grip wheels of a train have on the rails, see Frictional contact mechanics.
Road slipperiness is an important design and safety factor for automobiles
Split friction is a particularly dangerous condition arising due to varying friction on either side of a car.
Road texture affects the interaction of tires and the driving surface.
Measurement
A tribometer is an instrument that measures friction on a surface.
A profilograph is a device used to measure pavement surface roughness.
Household usage
Friction is used to ignite matchstick (Friction between the head of a matchstick and the rubbing surface of the match box).
Balancing application in engineering field Balance Engineering's complete line of production balancing machines utilize various correction processing techniques to balance a wide array of customerspecific parts and assemblies. We work closely with the customer to tailor the most accurate, reliable and cost-effective balancing application to match your needs. From simple drilling processes to more complex applications such as welding or punching, Balance Engineering stands ready to help solve your balancing needs with any number of standard and customized solutions. Drilling Applications
This method of balancing customer-specific parts utilizes a drilling process to remove metal for part correction. This process can be accomplished in a vertical or horizontal attitude, and use any number of dfferent drill types and diameters. The appropriate configuration will depend on specific part and production process requirements. Typical parts utilizing this process include crankshafts, engine dampers, and other rotating members with sufficient metal thickness to allow drilling without compromising component integrity.
A newer technology used with great success on many of our machines is Minimum Quantity Lubrication ('MQL') drilling. Rather than pumping large quantities of coolant onto the part as necessary during a normal drilling operation, the MQL method forces small quantities of coolant through the drilling tool and directly into the drill hole during correction. This method allows faster drill speeds, resulting in shorter cycle times and enhanced formation and extraction of drilling chips. The overall drilling process is much cleaner. MQL has become the preferred method employed by Balance Engineering on our machines using drilling correction. Grinding Applications
Grinding is another commonly used method for balancing parts and assemblies. This involves abrasive removal of material from specific areas on the part. This process can be employed in either a vertical or horizontal attitude and use any number of different grinding tooling, depending on the part configuration and correction requirements. Typical parts utilizing grinding correction include flywheels, stators and brake discs.
Milling Applications
This method of balancing customer-specific parts utilizes a milling process to remove metal for part correction. Milling is generally employed for part configurations that do not lend themselves to any other metal removal correction process. Typical parts using this process include brake rotors, brake drums and stator assemblies, among others. Nibbling / Notching Applications
This method of balancing customer-specific parts utilizes a metal removal process known as nibbling or notching. This involves using specialized tooling to shear small sections of material from the part edge surface at calculated vectors to achieve specified balance. Normally accomplished in a horizontal attitude, nibbling/notching removes metal from the outside diameter of any given rotor in any number of heights, widths or depths. Typical parts utilizing this correction process include various transmission components such as hubs or housings.
Piercing / Punching Applications
This method of balancing customer-specific parts utilizes a metal removal process known as piercing or punching. This involves using specialized tooling to remove small sections of material from the part surface at pre-calculated vectors to achieve specified balance. Piercing or punching can be accomplished in either a horizontal or vertical attitude, employing any number of tooling shapes and sizes to extract material from a given part. Typical parts utilizing this correction process include thinner metal components such as flywheels, hubs or housings. Welding Applications
This method of balancing customer-specific parts utilizes a metal addition process known as welding. This involves using specialized tooling for attaching pre-cut or variable length metal weights onto the part surface at pre-calculated vectors to achieve specified balance. Weld correction can be accomplished in several different ways, including projection and spot welding. Typical parts utilizing this correction process
include
torque
converters,
assemblies and driveshafts, among others.
turbine
assemblies,
axle/differential
Current technology applied in belting system Steel belts are top of the milk for Tetra Pak
Tetra Pak has recently launched the Tetra Evero Aseptic one–litre – the first aseptic carton bottle for milk. The new carton combines the easy handling and pouring of a bottle with the environmental and cost advantages of a carton. It is initially being aimed at the ambient white milk market, including non-oxygen sensitive enriched products, including flavored milk and cream. Unlike traditional carton materials, which are aseptically sterilized before they are formed into shape, the Tetro Evero Aseptic is pre-formed and not flat-packed, meaning it requires an alternative approach. The majority of existing technologies for sterilizing performed shapes rely on a gascondensation process. This process involves the gas condensing on the material surface, but this is known to be complex and difficult to control. The Tetra Evero Aseptic, however, uses a new gas-phase sterilization technique which involves the cartons passing through a unique aseptic chamber in pairs where they are exposed to hydrogen peroxide. The gas comes into contact with the whole preformed package – inside and out, removing any contaminants that might have been present before entering the aseptic chamber. The cartons travel on steel belts during this production process. The use of steel belts is a highly hygienic alternative to using traditional plastic and PU conveyor systems. Avoiding the spread of contaminants is imperative in belt technology: steel
belts are far easier to clean than their plastic counterparts and do not need to be lubricated in order to transmit power. This is important because germs and potentially harmful bacteria are attracted to dust generated by lubricant grease, which can potentially contaminate food or other products. Steel belts are not just available as flat conveyors, they can be customized in many ways and offer novel and exciting solutions to a variety of complicated conveying problems. Belts can be perforated with complex patterns for timing, vacuum or dosing applications. Together, the steel belt technology and the new gas-phase sterilization technique used in the production of the new Tetra Evero Aseptic have resulted in a highly effective means of commercial sterility – an innovative development which should now set the gold standard for the production of aseptic packaging across Europe and the rest of the world. Stainless Steel Belts Shine in Solar Cell Applications Belt Technologies, a leading provider of metal belt and conveyor systems, provides photovoltaic manufacturers a more efficient means of producing solar cells that use the sun’s energy to generate electricity. As the world makes significant moves towards sustainability, manufacturers are continually searching for more efficient ways to produce products that take advantage of renewable energy sources. Belt Technologies’ steel belts have provided manufacturers a more effective solution for transporting components through the cell manufacturing process as well as final panel assembly. Used in tabber and stringer operations, the belts provide many benefits not found in alternative belting materials. The belts’ robust nature allows them to be perforated and sustain accuracy in high-speed vacuum systems. As a result, cells can be moved precisely to the required welding spot to achieve accuracies of .1mm or less in both the lateral and horizontal planes. Additionally, stainless steel belts from Belt Technologies are able to resist the high temperatures involved in laser soldering bus ribbons during the solar panel assembly process, avoiding the quality-threatening belt degradation commonly seen with plastic and fabric belts. Their longevity under intense heat provides cost savings to manufacturers as a result of fewer belt changes and reduced down time. Abrasion-
resistant release coatings prevent solder buildup and provide protection for the various fluxes commonly used in the manufacturing process.
Perforated Steel Belts Improve Efficiency in Blood Filter Production Belt Technologies has developed a perforated stainless steel belt that has significantly improved production efficiency for a leading manufacturer of advanced technologies in the separation of liquids, solids, and gases. The belt, used to transport pre-coated blood filter elements through a forced hot air drying chamber, has streamlined the production process and helped Porous Media Corporation of St. Paul, MN achieve machine efficiencies in the 96-98% range. The belt’s large perforations allow for the maximum amount of airflow through an upper and lower belt, resulting in complete drying of the liquid coating solution. Its seamless non-stretch surface eliminates the threat of particulate debris being introduced into the manufacturing environment, while allowing for a complete “clean and place” process, which cannot be done effectively with other belting materials. A cycled belt cleaning operation can be performed simultaneously with the production of the filters, eliminating the need for stoppages and resulting in machine efficiencies in the upper 90% range. The product’s non-stretch properties result in better positioning and increased accuracy.
Independent Pulley System Steers Flat Belts for On-the-fly Adjustments Belt Technologies has developed a simple and effective pulley system for independently steering flat belts while allowing for easy on-the-fly tracking adjustments. The patented system provides a solution to tracking problems encountered as a result of operating environment changes and also eliminates downtime by allowing independent belt adjustments on a multi-pulley common shaft. Steering is accomplished by adjusting the angle of the pulley relative to the belt and modifying lateral tension. Rather than moving the pulley shaft through the use of pillow block adjustments, the ISP design fits a variable steering collar (with either a skewed or offset bore) and a sealed bearing assembly to the body of the pulley. When rotated, the collar changes the angle of the pulley body, resulting in the controlled bi-directional movement of the belt across the pulley face.
New Stainless Steel Tapes Drive Robotic Arms Belt Technologies has introduced a new high-performance line of stainless steel drive tapes used in conjunction with SCARA robots in atmospheric and vacuum wafer transport applications. The tapes provide significant advantages over alternative drive methods including reduced vibration, improved accuracy, and a cleaner manufacturing environment. Reinforced with standard or custom end tabs, Belt Technologies drive tapes are easy to install. The low-mass, low-stretch properties of these tapes result in precision tolerances with no outgassing and low hysteresis. Smooth surfaces provide for a much cleaner manufacturing environment by eliminating the particulate debris that is a common biproduct of traditional systems. Designed to minimize vibration, these stainless steel drive tapes allow for rapid acceleration, improved positioning accuracy, and high levels of repeatability; resulting in better performance with increased throughput. Belt Technologies stainless steel drive tapes can be customized for specific applications in the nano-technology, solar and fuel cell, data storage, opto-electronics, LCD/LED, pharmaceutical, and biotech industries.
