Product Description

Rubber wrapping drum is an important component and part of belt conveying system. The rubber wrapping of the drum can effectively improve the operation condition of the conveying system, protect the metal drum from wear, prevent the slip of the conveyor belt, and make the drum run synchronously with the belt, so as to ensure the efficient and large volume operation of the belt. The rubber coating of the drum can also effectively prevent the sliding friction between the drum and the belt, reduce the material bonding on the drum surface, and reduce the deviation and wear of the belt. Widely used in: Iron and steel, metallurgy, coal, cement, power generation, chemical fertilizer, CZPT depot, port and other industries.

Coating material

Natural rubber, nitrile rubber, neoprene, EPDM, polyurethane, etc. can be used.


There are 2 types of rubber wrapping roller technology. The traditional rubber wrapping technology, such as hot vulcanization technology, mainly vulcanizes its rubber with the roller through the vulcanization tank to ensure the bonding strength between the rubber wrapping panel and the roller. The second is cold vulcanization technology, which uses a special cold vulcanization method to directly CZPT its roller with the rubber wrapping panel, which can be used for on-site rubber wrapping, underground rubber wrapping, etc, Its technology is more advanced, but also greatly reduces the labor cost.

Manufacturing process: generally, in terms of the main shaft of the drum, it can be divided into the following 2 types according to the load: (1) the mandrel only bears bending moment, such as the shaft of the drum group; (2) The rotating shaft bears bending moment and torque at the same time, such as the shaft of the transmission drum group; The material of the shaft is generally rolled or forged carbon steel or alloy steel. The usual material is medium carbon steel. No. 45 steel is the most commonly used. For the shaft with large stress and limited size, and some shafts with special requirements, alloy steel can be used. The material is 40 chromium. According to the needs, the shaft generally needs heat treatment or surface strengthening treatment, In order to improve its mechanical properties and wear resistance, the difference of elastic modulus between alloy steel and carbon steel is very small at general temperature, so the use of alloy steel can not improve the stiffness of the shaft; The shaft material is generally subject to quenching and tempering treatment. For the transmission drum group, when the shaft strength index does not meet the requirements, it can also be combined and quenched and tempered, and checked according to the allowable stress of symmetrical circular bending; The technical requirements for shell design are: (1) when the shell is curled, it must follow the rolling direction of the steel plate; (2) The misalignment at the joint shall not be greater than 1mm; (3) Ultrasonic or X-ray flaw detection must be carried out for the longitudinal weld after the drum is coated with glue: ultrasonic flaw detection shall be carried out for 10%, and the weld shall reach grade II in the standard; Radiographic flaw detection starts from 1 end and detects 20% of the total length. The weld reaches grade II of the national standard. If the flaw detection length is doubled and still unqualified, full-length flaw detection shall be carried out until it meets the requirements; (4) The roundness tolerance of the rolled shell shall not exceed 0.5; (5) Material: Q235 section steel with yield strength of 235 n / m2; For medium-sized drum group and light-duty drum group, when the outer diameter of the hub is greater than 220mm, cast steel shall be used. For light-duty drum group, when the outer diameter of the hub is less than 220mm, hot-rolled round steel shall be used, which shall meet the national standard.


Pulley Type

There are several types of pulleys. These include fixed pulleys, load multipliers and movable pulleys. Below is a description of each pulley type. A load multiplier is a special type of pulley with multiple wheels for increased lifting capacity. It is used in a wide range of applications including power transmission and construction. Some common uses of pulleys are listed below.

moving pulley

Movable pulleys work by transferring the weight of a load to another object of the same mass. Since a live pulley is inherently frictionless and weightless, the force required to lift a load with it is the same as the weight of the load. This principle applies to tall buildings and residences. It is an excellent choice for lifting heavy objects such as furniture and washing machines.
A pulley is a mechanical device with a wheel that rotates on a shaft. The axle is attached to the wheel and is usually fixed. The movable pulley can be fixed or movable, both of which can change the direction of the force on the rope. Some pulleys can also change the magnitude and direction of the force. They are ideal for a variety of applications, from lifting heavy objects to transporting objects.
Another type of movable pulley works by transmitting force to another object. It has a free axis and the total force provided by the rope tension is balanced. Since the tension on the rope is constant in each segment, pulling 1 end of the rope will double the force on the shaft, resulting in 2 mechanical advantages. This mechanical advantage is the main reason why movable pulleys are so versatile.
Another form of moving pulley is called a KWL diagram. The KWL diagram summarizes the basic concepts of the drive wheel. KWL diagrams are an excellent way to assess a student’s understanding of the concepts discussed in the course. Word questions are a great way to check whether students understand concepts. When students answer the word questions correctly, the answer is yes!

Fixed wheel pulley

If you need to move heavy objects, a single fixed wheel pulley is not a good choice. Using a single fixed pulley might be similar to using a handbag, but it’s not very convenient. This type of pulley system relies on friction to transmit motion. As a result, it can slip and isn’t always reliable. Fortunately, you can find other options that work just as well.
Fixed pulleys are the most basic type of pulley. They consist of grooved wheels and ropes attached to objects. These pulleys make lifting easier. Because the rope or cable only moves in 1 direction, the movement of the object feels lighter. And they are also easy to install. However, before you buy a fixed wheel pulley, make sure it is strong enough to support the weight of the load.
The disadvantages of fixed pulleys are obvious. One of them is the lack of mechanical advantage. A fixed pulley pulls up with the same force as a single moving pulley, and a single fixed pulley is not particularly effective as a force multiplier. However, the effect is more pronounced when you combine multiple fixed-wheel pulleys. You will get double the power! So what do fixed wheel pulleys have to offer?
Fixed wheel pulleys can be as small as a ring. A single ring pulley requires twice as much force as the weight being pulled. Adding more loops to the rope will reduce the effort required to pull the weight. The mechanical advantage of a fixed pulley is proportional to the number of strands running to the free pulley. A 100-pound pull on the free end will lift a 300-pound load.

composite pulley

Compound pulleys are pulleys that can be used to change the direction of a control wire. It can also be used to modify the mechanical force of the wire by moving the item it is connected to. In galleons, compound pulleys are more common. They are often combined with other ropes for mechanical advantage. Here are some common uses for composite pulleys.
The ideal mechanical advantage of a pulley is equal to the number of rope segments that pull up the load. This means that the more rope segments, the less force is required. A compound pulley will have the ideal mechanical advantage of 2, which means it will generate more force than a simple pulley. Composite pulleys are also more efficient at transmitting force because their number of rope segments is usually equal to the unit weight.
Composite pulley systems use more than 2 pulleys and ropes. More pulleys will reduce the force required to move heavier objects. They are usually used in large sailboats. The system is also used on construction sites. It can be used for a variety of applications, including lifting large objects or transmitting electricity. You can imagine how it would change your life if you had to move a large sailboat, but the result would be the same: a composite pulley system would make it easier to lift a large sailboat.
Composite pulleys are also known as fixed pulleys. The fixed pulley is stationary, and the movable pulley moves back and forth. The latter is more effective when used with a detachable cord or strap. On the other hand, a moving pulley is a moving pulley and it gives you a mechanical advantage. You can imagine this pulley on a flagpole.

load multiplier

The multiplication system has 3 basic parts: the rope grab, the connector, and the pulley. While some basic multipliers may combine the 3 parts, the concept remains the same. The multiplication system can make pulling the rope easier by reducing the amount of friction that occurs. Below are some examples of multiplication systems. A compact rope grab is a great option for resetting the multiplier.
The load reduction that a pulley system can achieve is proportional to the number of ropes used to support it. Although most utility pulley systems use only 4 ropes, the theoretical maximum load reduction is a quarter of the actual load. In other words, the four-wheel system only reduces the weight of a 1,000-pound load by a quarter. That would require 167 pounds of force, a far cry from the 500-pound load a single pulley system can achieve.
The mechanical advantage of a pulley system can be calculated by calculating the ratio between the forces exerted on each wire. For example, a 90-kilogram load is supported by 3 ropes, each weighing about 30-5 pounds. The ropes on pulleys A and B each carry a load of 60 kg. Using this formula, a single pulley system will yield a mechanical advantage over 2 tractors.
To calculate the force required to pull the rope over the pulley, measure the angle and deflection between the ropes. The deflection angle when added to the included angle should equal 180 degrees. A 75 degree angle requires 159% of the load force. This means a total load multiplier of four. This formula is an important tool for calculating the force multiple of the pulley.

Disadvantages of fixed pulleys

There are 2 basic types of pulleys: movable and fixed. Active pulleys are more advanced, allowing the pulley to move according to the load. They reduce the force required to lift the load. Active roller pulleys are more compact and therefore take up less space. Both types are good for lifting heavier objects, but they each have their pros and cons.
Fixed wheel pulleys can be used to lift heavy objects. This type of pulley consists of a wheel with a fixed shaft that has grooves on its edges for guiding ropes or cables. This is a simple machine as no motor or engine is required to lift objects. When 2 or more wheels are used together, the ropes around the wheels form a powerful hoist.
Single wheel pulleys are not suitable for lifting. They tend to push things down. Also, they are unreliable because they rely on friction and can slip. Also, a single wheel pulley would require a lot of space. Another disadvantage of fixed-wheel pulleys is that they make it difficult to move heavy objects easily. Single fixed-wheel pulleys also tend to slip easily, making them a poor choice for many applications.
Fixed wheel pulleys are also easier to install and maintain than manually operated ones. It requires less space and lubrication than manual pulleys. Manual pulleys can cause injury because the operator will be lifting the full weight of the heavy object. Additionally, rope slippage can lead to muscle strains and rope burns. And the system requires frequent maintenance.

China supplier 630 X 2200 X 200/160 X 2990mm Bend Pulley   with Best SalesChina supplier 630 X 2200 X 200/160 X 2990mm Bend Pulley   with Best Sales

Conveyor Pulley

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