Daily Archives: October 21, 2015

Oil Seals

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In terms of an oil seal, there are a lot of different types. Depending on how they are constructed, U-ring oil seals as well as block vee rings can be used as a rod seal, a piston seal or even a symmetric seal. U-rings and block vee rings are called single acting seals, also known as unidirectional seals, and have to be mounted back to back in cylinder applications that are double acting.

A Block Vee seal is really more compact and performs better under high pressure conditions than a U ring does. V ring seals are made of all rubber and are primarily used to get rid of dirt and other types of contaminants. V rings are stretched over a shaft and sealed against the side of housing or another type of machine component. Besides, more oil seals are introduced as there are several different kinds of clearance seals, also known as labyrinth seals. The one feature they all share with each other is that they all work on a principle of positive clearance. This means that there isn’t any rubbing that occurs against the shaft or the housing.

A lot of labyrinth seals are made up of a rotor, which rotates, and a stator, which is static, piece with a radial gap between the two pieces. The gap has to be bigger than the radial clearance of the bearing that is being sealed. Also, the operating speeds as well as the temperature have to be considered when utilizing a labyrinth seal. These kinds of seals typically don’t perform very well at lower operating speeds.

Another type of labyrinth seal is a laminar sealing ring, which utilizes a series of flat metal rings, similar to washers, of different diameters to make a labyrinth seal. Bearing isolators are a dynamic kind of seal that is designed to keep bearings protected from outside elements. They are also made up of a rotor, a rotating piece, and a stator, or static member. Some bearing isolators are made out of labyrinth construction but others use O rings or other kinds of positive seals.

More about oil seals and check it out now!

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To Eliminate Noise from a Switch Mode Supply

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A switching mode power supply is very efficient in its working. Although, the supply is designed in such a way that it produces noise that is inaudible to the human ear, it sometimes gives a lot of noise especially when it gets old.

The good news is that if your switching mode power supplies producing a lot of noise there are ways in which you can eliminate the noise.

 

High-pitched whine with a fan

The noise is caused by lack of lubrication in the fan bearing. To eliminate the noise you should lubricate the bearing. This calls you to unplug the device from the power supply and remove the fan’s bearing protective plating. You should then put a few drops of sewing machine oil directly onto the bearing.

You should note that some protective plating is held by screws while others are held by a thick sticker.

High-pitched whine without a fan

This noise is usually caused by external electromagnetic interference (EMI). To solve it you need to move the power supply away from anything that produces a large amount of EMI. Some of the objects that tend to produce a lot of EMI include: large speakers, large batteries, fluorescent lights and flat-screen monitors.

If you remove the supply from these objects and the noise persists, it must have been caused by a dry capacitor. You should remove the capacitors together with the soldering iron and then replace them with new capacitors.

You should note that capacitors have the ability of causing massive electronic shock; therefore, after unplugging the power supply you should leave it unplugged for at least three hours before you remove the capacitors.

Low-pitched hum

If the low-pitched hum is annoying, you should put the supply in a metal casing in order to shut the noise in the casing. All you should do is to visit your local store and find a casing that will fit your entire power supply unit. You should then place the supply inside the casing and screw the casing shut.

Conclusion

These are some of the ways in which you can eliminate the noise in a switching mode power supply unit. If you do all of the above and the noise persists, you should take your device to a professional who will rectify the problem for you.

To ensure that your device lasts for a long time without developing problems, it’s good that you buy your device from a reputable seller.

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Pallet Truck: For Large Weights

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Pallet Jack scales also known as a pallet truck is an ideal tool which is typically used to weigh a variety of large items including pallets, drums, kegs and barrels. In a pallet jack scale, the forks are separated from the front wheels as the hydraulic jack is raised forcing the load upward until it clears the floor. The pallet is lifted as much as necessary to clear the floor for subsequent travel. In just one operation, one can lift the load, read its weight, and move it to its destination using the Pallet Jack scales.

This scale is ruggedly built to be cognizant of the extensive industrial use. It delivers reliable weighing results or counting results wherever it is used. These scales are used to speed up the warehouse and shipping processes. Heavy duty Pallet Jack scales can be used for permanent or portable installations. The adjustable leveling feet and the optional four-way ramp access make the loading process simple.

A typical scale consists of one set of pallet, an indicator box (with indicator), a junction box and a built-in printer which is optional. There are different types of Pallet Trucks in the market. An ideal scale should have a leak proof design, extra roller for easy moving, plastic bonded three lever positions, easy to operate, silent in operation, minimum pulling power, no oil leakage, minimum maintenance and maximum mobility. There should be a constant floor contact and stability. The wheels should sustain heavy loads and hence minimize wear and tear. The Pallet Jack scale should provide for easy operation from all angles ergonomically.

A scale should be designed to reduce the pulling power and minimize operation fatigue. Some of the key specifications of a Pallet Scale are the load capacity, lowest fork height, highest fork height, turning wheels, load wheel single, load wheel double, fork size, fork overall width and fork length. Self-Propelled Electric Pallet Truck and Pallet Jack with scale, 4500 lbs, are some of the latest Pallet scales available in the market. Ergonomic handle features, easy to operate throttle with infinite forward and reverse speeds, lift / lower controls, horn and safety-reverse button are some of the features of these models.

The drive motor controller prevents unsafe starts after the safety-reverse button has been inadvertently struck. Double reinforced welded forks with adjustable tie-rods increases the years of service. Electromagnetic disc brake with automatic dead-man feature activates when the user releases the handle. An integral battery charger and a battery level gauge are included in these models.

The pallet scale rolls smoothly on the polyurethane, steer and load wheels making them one of the most reliable tools. A pallet scale maximizes efficiency by eliminating wasted time and floor space when checking inbound and outbound shipping weights of up to 5000 lbs. One can conclude that quick verification of incoming / outgoing freight, checking weights anywhere in the plant, in transit without hauling loads to a platform, all-purpose mobile scale, batch and drum filling and inventory control are a few of the many uses that a Pallet scale can offer.

Pallet Jack Scale
Scales are used for taking various measurements, whether it is weight, volume or mass. Now-a-days digital scales are used largely. Scales give the measurement which is required while disposing anything or to accommodate anything.

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