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Classification of conveyor

Apr. 16, 2022

Conveyors are generally classified by the presence or absence of traction members.

A conveyor with a traction member generally includes a traction member, a load bearing member, a driving device, a tensioning device, a redirection device, a support member, and the like. Traction parts are used to transmit tractive force. Canvas conveyor belts, traction chains or wire ropes can be used; load-bearing members are used to carry materials, such as hoppers, brackets or spreaders. Brakes (stoppers) and other components; tensioning devices generally have two types: screw type and heavy hammer type, which can keep the traction member a certain tension and sag to ensure the normal operation of the conveyor; the support member is used to support the traction member or The supporting member can be a trough idler, a roller, etc.

The structural features of a conveyor with traction members are: the material being transported is loaded in a load-bearing member connected to the traction member, or directly on the traction member (such as a conveyor belt), and the traction member bypasses each roller or sprocket They are connected to form a closed loop including an on-load branch that transports material and an unloaded branch that does not transport material, and the continuous movement of the traction member is used to transport the material.

There are many types of conveyors, mainly belt conveyors, plate conveyors, trolley conveyors, escalators, moving walkways, scraper conveyors, buried scraper conveyors, bucket conveyors, and bucket elevators. , Hanging conveyors and aerial ropeways.

The structure and composition of conveyors without traction parts are different, and the working components used to convey materials are also different. Their structural characteristics are: the use of rotary or reciprocating motion of the working member, or the use of media in the pipeline to make the material forward. For example, the working member of a roller conveyor is a series of rollers, which rotates to convey the material; the working member of the screw conveyor is a spiral, which rotates in the trough to push the material along the trough; The component is a trough, which is reciprocated to convey the materials placed therein.

Steeply Inclined Belt Conveyor

Steeply Inclined Belt Conveyor

Belt Conveyor

Belt conveyor is the most important modern bulk material conveying equipment. It is widely used in electric power, food, metallurgy, chemical industry, coal, mining, port, building materials and other fields. Belt conveyors have gradually begun to replace automobiles and locomotives in some areas because of the characteristics of a wide range of conveying materials, a wide range of conveying capabilities, strong adaptability of conveying routes, flexible loading and unloading, and high reliability and low cost transport. Becoming the main equipment for bulk transportation, playing an increasingly important role in the socio-economic structure. In particular, the electric drum-driven belt conveyor has incomparable advantages and development potential in the bulk material conveying process of the grain depot. Therefore, we open up our thinking, strive to innovate, and combine our original knowledge and existing data to control it. Make innovations. In this process, we test our own innovation ability to make it more widely used in various fields of the national economy and play a more important role.

Gravity Roller Conveyor

Also one of the simplest types, they are very affordable. A series of rollers mounted on a side frame provides the rolling surface. When mounted on a decline angle, parts move by themselves. However if using gravity conveyors for parts of different size and weight it can be more difficult. you will need to control the speed and angle. Parts running into each other may cause damage. But compared with carrying parts from point A to point B, a gravity roller table is often a great starting point. It is a very simple productivity improvement. 

Chain Conveyor

Floor mounted chain conveyors are great for heavy items. They are especially useful for items that have an uneven lower surface. The conveyor chain provide two or three contact points on the bottom of the load. As the chain moves it carries the product forward. They’re used to carry pallets and large industrial containers. If necessary, products are mounted on a fixture, or “skid” and the fixture is carried along the chains. This is a common application in auto plants. They are heavy duty, and generally move at slow speeds.

Live Roller Conveyor / Chain Driven Live Roller (CDLR)

If we combine the rollers from a gravity conveyor with the chains of a chain driven system, we can link the rollers. Add a motor and gearbox and now we have a live roller conveyor or chain driven live roller system. Sometimes people in the industry use the acronym CDLR. They are members of the floor conveyor family, and they are heavy duty material handling systems. Use them to transport pallets, seats (on skids or pallets), tires and containers. If fitted with loose plastic sleeves over the rollers as shown in the photo below, they can accumulate or buffer product. The rollers can keep moving even though the product on top is not moving. Chains are linked together from one roller to the next on the side.

Motorized Roller Conveyor

What if we put the motor inside the rollers? These modern motors are at the heart of today’s sophisticated distribution centers. With high speeds of 200 feet per minute or more, your Amazon and mail packages delivered to your home passed along miles of these type of conveyors. They use one or more motor driven roller per zone to create a series of zones along the conveyor.

Slat Conveyor

A slat conveyor is simply a two-strand chain system with slats connected to the chain and a guiding system for the slats. This creates a smooth surface to which tooling details or fixtures are mounted. Use this to hold parts in the desired position. Sometimes the fixtures can also allow the part to rotate 90 degrees or 180 degrees as required in several planes. Therefore you can use slat conveyors as a working surface for assembly operations. Positioning of the part is also quite precise. So it’s common for robots to perform the loading or unloading operation at one or more ends of a slat conveyor.

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Overhead Hand Push Beam Trolley Systems

Moving on to the overhead family of conveyor types, the simplest systems are hand pushed beam trolley systems. We use enclosed track or I-beam section as a track. These types are extremely versatile, easy to set up and affordable. They are mounted above the workplace with roof-supported or floor supported steel structures. For more information on the nine different types of overhead style systems, see this graphic. Trolleys for these systems are under $50 each and the tracks are also very affordable.

Motorized Overhead Conveyor / Monorails

One of the most common types is an overhead conveyor with the trolleys connected together with a chain. The chain can either be enclosed (“enclosed track”) or open below an I-beam. These style of material handling systems are installed in nearly every high volume production facility. The chain is driven by a motor with a gearbox, and the parts to be moved are suspended from trolleys attached to the chain. Many different attachment types are available. For complex parts, use a fixture or carrier suspended from several trolleys to locate the part in position. The chain can be always running, or alternatively the system can index. This moves parts from one assembly station to the next at a predetermined interval.

Power and Free Conveyors

Also in the overhead family of devices is the power and free conveyor. It’s like a regular motorized overhead system, except it has two tracks. In one track, the chain is continuously running. In the other track, the trolleys move along with the chain using pusher mechanisms (known as “pusher dogs”). They’re mounted at regular intervals on the chain. When two trolleys are pressing against each other, the dogs can slide over the top. Likewise, a stop blade can be used with a pneumatic cylinder to replicate this geometry. This allow trolleys to start or stop movement virtually anywhere in the system. This versatility makes power and free conveyors the most productive style of overhead systems. They can start, stop, buffer and re-sequence parts with switches.

Over Under Conveyors

As the name implies, they go over, and they go under. Available in hand push, motorized and power and free versions.

Inverted monorails and inverted power and free

Just like their overhead configurations, except the track is on the ground and the load is above the track. Useful in paint finishing applications to avoid dust or oil dripping onto parts. Widely used in automotive final assembly operations.

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