Double Sprockets Chain

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A double sprocket chain, also known as a duplex chain, is a type of mechanical power transmission chain used in various applications, particularly in machinery and vehicles. It consists of a series of interconnected links that engage with toothed sprockets to transmit rotary motion and power from one shaft to another. The "double" in double sprocket chain refers to the fact that it has two parallel rows of links, providing increased load-carrying capacity and durability compared to a single-row chain.

 

 

 

 

 

 
Material selection: According to the use requirements and working conditions of the sprocket, select suitable materials, such as medium carbon steel, medium carbon alloy steel, etc. Common materials include 45 steel, 40Cr, etc. For some occasions with higher requirements, carburizing steel such as 20CrMnTi will also be selected.

 

Forging: Forge the selected steel, and make the internal structure of the metal material denser through heating and external force, so as to improve the strength and toughness of the sprocket. The forged blank needs to be annealed to eliminate forging stress and improve cutting performance.

Machining

Turning: First, turn the blank to machine the basic outline of the sprocket, including outer diameter, inner diameter, hub thickness, etc. Ensure that the dimensional accuracy and surface roughness meet the requirements, and provide a benchmark for subsequent processing.

 

Milling: Use a milling machine to process the tooth shape of the sprocket. Common methods include forming milling and generating milling. Forming milling is milling with a forming tool that is the same as the sprocket tooth profile, which is suitable for single-piece small-batch production; generating milling is using a gear processing machine to generate the tooth profile through the relative movement of the tool and the workpiece. It has high processing accuracy and is suitable for mass production.

 

Drilling: According to the structural requirements of the sprocket, the mounting holes, keyways, etc. are processed. When drilling, the position accuracy and verticality of the holes must be ensured to ensure the matching accuracy between the sprocket and the shaft.

 

Heat  treatment: The processed sprocket is heat treated, such as quenching and tempering, to improve the hardness, wear resistance and fatigue resistance of the sprocket. For sprockets made of carburized steel, carburizing treatment is also required to increase the hardness and wear resistance of the tooth surface.

 

Grinding: Grinding key parts such as the tooth surface, outer diameter, and inner diameter of the sprocket to further improve the dimensional accuracy and surface roughness, reduce the roughness value of the tooth surface, and improve the transmission efficiency and service life of the sprocket.

 

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Dimensional accuracy test
Use calipers, micrometers and other measuring tools to measure the outer diameter, inner diameter, hub thickness, tooth thickness and other dimensions of the sprocket to ensure that they meet the requirements of the design drawings.
For the size of the keyway, a keyway plug gauge can be used for testing to ensure the width and depth accuracy of the keyway.

 

Hardness test
Use a hardness tester to test the hardness of different parts of the sprocket, such as the tooth surface and the core. Check whether the hardness meets the requirements after heat treatment to ensure that the sprocket has sufficient strength and wear resistance. Uneven hardness can cause local wear or deformation of the sprocket during use, affecting the transmission performance.

 

Ultrasonic testing
During ultrasonic testing of sprockets, the reflection characteristics of ultrasonic waves at the interface of different media are used to transmit and receive ultrasonic waves through the probe, and the echo signal is analyzed to determine whether there are defects such as cracks and pores inside.

 

 

Duplex Design: As mentioned, the chain has two parallel rows of links, which increases its strength and load-carrying capacity. This design allows it to handle heavier loads and higher torque compared to single-row chains.

 

Interconnected Links: The chain is composed of individual links that are interconnected in a specific pattern. These links can vary in shape and size depending on the specific application and industry standards.

 

Toothed Sprockets: Double sprocket chains engage with toothed sprockets. The teeth of the sprockets fit into the gaps between the chain links, creating a positive engagement that allows for efficient power transmission.

 

Various Sizes and Configurations: Double sprocket chains come in various sizes, pitches (distance between the centers of adjacent pins), and configurations to match the requirements of different applications. They can be customized to fit specific machinery or systems.

 

 

Power Transmission: The primary function of a double sprocket chain is to transmit mechanical power between two parallel shafts. When one sprocket is turned, the chain engages with its teeth and transfers rotational motion to the second sprocket, thereby transmitting power and torque.

 

Load Handling: Due to their duplex design, these chains are capable of handling heavier loads and higher stresses than single-row chains. This makes them suitable for applications that involve substantial loads and forces, such as in industrial machinery, conveyor systems, and heavy equipment.

 

Durability and Reliability: The construction of double sprocket chains enhances their durability and reliability, making them well-suited for applications where consistent and robust performance is crucial.

 

High-Speed Applications: Depending on the quality of materials and manufacturing processes, some double sprocket chains can be used in high-speed applications, delivering smooth and efficient power transmission even at elevated rotational speeds.

 

Versatility: Double sprocket chains find applications in various industries, including manufacturing, agriculture, construction, and automotive, where they are used in equipment like conveyors, vehicles, and industrial machines.

 

 

 

 

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