Archive → August, 2010
Pulleys, which may be drum-type or roller-type, are the most common simple machines used to drive the belt of most conveyors systems. Because of its wide use, manufacturers have made improvements for better system performance and longer life. One of these is the crown conveyor pulley.
Pulleys are tubular-shaped drums that are used to drive the belt of a conveyor system. The drive pulley is connected to a motor, which, as a result, transfers the torque required to steer the conveyor belt. Consequently, the conveyor belt moves along the path. However, because of its mechanism, the common problem for most conveyor pulleys is the tendency of the conveyor belt to move sideways or away from its supposed track. When this happens, the belt is exposed to excessive wear as it rubs against the conveyor frame and in effect, it deteriorates faster. Also, the rubbing causes friction, which, in turn, results in increased drive motor load and power consumption as well.
This is where crowned pulleys come in useful. They are installed to ensure that the belt is on track and not drifting sideways. Whether tapered or trapezoidal, crowned pulleys consist of a drive pulley with a center diameter that is slightly longer than those of the ends. The diameter difference causes the belt to correct itself by constantly moving back on its track as soon as it tends to drift away.
Its drawback, however, is the cost. The material itself as well as the machining process causes it to be a bit expensive. At present, heavy metal is used for the wall tubing of the crown. And during the machining process, substantial unusable portions of the material are wasted.
As the belt conveyor moves, the drive pulley tends to slip. This led the manufacturers to develop drive pulleys with smaller diameters. But because the diameter is smaller, there is less surface area contact with the conveyor belt. This, in turn, results in limited torque transmission. To solve this problem, engineers thought that molding rubber or some synthetic material to the drive pulley surface would increase the grip and, in effect, torque transmission. The rubber covering is what they call lagging. Lagging provides the necessary traction in order for the pulley to work more efficiently.
Rubber material is compounded and applied to the pulley. Manufacturers do vulcanized lagging in different degrees of hardness according to customer specifications, in any diameter or length. There are various patterns to choose from – plain, ceramic, crown, herringbone and groove patterns. However, this may be expensive. The process of placing the rubber to the roller and the material itself is relatively high in cost. There is a cheaper alternative to lagging, which consists of wrapping the lagging. The result is a crown-like effect on the pulley. The disadvantage of this type of lagging is the effect of stretching the conveyor belt.
Crown conveyor pulleys can be very useful, if you know how to use and take care of it. Proper machine handling and maintenance can do wonders in increasing its life. So if you are thinking of using one of these for your plant or business, know the basic mechanism and find the useful innovations made on it. While it may be costly at first, but in the long run you are able to save your money because of the many years that the machine can serve you.
Article Source: http://EzineArticles.com/?expert=Anthony_Doyle
It is known that a conveyor belt is very beneficial for industrial. However, some people maybe still do not have an idea about the the way this equipment works. If you want to know about the work of this equipment, you have come to the right place. Just take a look at the following information and you will know how this equipment works.
Basically, conveyor belt is a very wide belt that is attached to a loop and to two or more turning rotor which is driven by motors. Meanwhile, the loop is an actual conveyor belt that is commonly made of two or more layers of rubber. One of the layers has a function for giving structure and shape to the belt, while the other layer has a function for allowing the tool in transporting its load safely. Generally, the loop is attached to the two wheels that are called rotors. These rotors are rotated by motors. Additionally, this equipment is made with enough friction between it.
Moreover, when the rotor is turning, you will find that the conveyor belt will also turn based on the intense friction between the belt and the rotor wheels. The turning motion of the rotor can cause the moving of one side of the belt in one direction, while the other side is moving in the opposite direction. It means that the wheels should always move in relatively same direction. Additionally, you need to pay attention in the moving of the two rotor wheels. If they move in the opposite direction, you will find that this equipment will not travel at all.
Furthermore, conveyor belt actually comes from the word convey that has a meaning of sending or transmitting. That is why this tool is used for sending or transporting materials. You can find that this equipment is commonly used in the industry, raw materials or convey products.
Article Source: http://EzineArticles.com/?expert=Alexander_O_Mcgee
Today, conveyor belts are one of the major means for conveying heavy and light materials from one location to another in factories and other places. The working of the conveyor belt is very simple. A wide range of conveyor belt tools is essential for the proper working of conveyor belts. The principal part of conveyor belt tools is the conveyor belt splicing kit. Apart from this, heat measuring or controlling devices and different types of slitters are also an integral part of conveyor belt tools.
Conveyor belt splicing kits encompasses belt bonder kits and alternate tools. The belt bonder kit is used to join conveyor belts. Generally, a belt bonder kit will include a heat wand, cutter, gripper, trimming tools and driller. Both standard and heavy duty conveyor belt bonder kits are available. The standard conveyor belt bonder kit is widely used for welding polyurethane and polyester conveyor belts. The standard heat wand will work at low energy. Heavy belt bonder kits are ideal for heavy welding purposes. This is inclusive of a heavy duty heat wand that normally works at 100 volts or more. On an average, a standard belt bonder kit costs around $250, and a complete heavy conveyor belt bonding kit will cost around $3300.
Alternate tools of conveyor belt splicing kits are different types of grippers. The grippers usually hold cords. Depending on the use, one can avail of metal and plastic grippers. When compared with metal grippers, plastic grippers are light weight and easier to handle.
Different types of gadgets are used to measure and control the heating devices. Temp-o-meter, an electronic sensor that scans differences in temperature, is most commonly used to measure the temperature. It can read temperature in both Fahrenheit and Celsius, and generally works on battery. The heat controlling devices will constantly monitor the changing temperature power wattage being delivered to the heat wand, and control it.
A slitter is also an integral part of conveyor belt tools. It is usually incorporated with a table, and is available with different lengths of blades. A complete 12 ft slitter unit with a knife blade holder will cost around $2,500. Customized slitters are also available.
Conveyor belt tools can be availed from conveyor belt suppliers and wholesalers, or ordered directly from the manufacturers. C. M. Products Company, VOLTA Belting Technology Ltd., and DuraBelt, Inc. are well known for quality conveyor belt tools. Today, most manufacturers and sellers have websites that provide a range of online services for the ease of customers.
Conveyor Belts provides detailed information on Conveyor Belts, Plastic Conveyor Belts, Wire Mesh Conveyor Belts, Rubber Conveyor Belts and more. Conveyor Belts is affiliated with Fiber Optic Connectors [http://www.cnconveyorbelts.com/].
Article Source: http://EzineArticles.com/?expert=Marcus_Peterson