The Sanlai Jiaobian lead has two types: special core structure and rope core structure, which are respectively composed of four parts: cloth covering, top rubber, tensile body and bottom rubber.
The V-belt with the rope core structure is convenient to manufacture, with general tensile strength and low price. The V-belt with the special core structure is widely used and has good toughness and high strength. It is suitable for occasions with high speed.
Classification
Ordinary core
Most of the cores of the ordinary V-belt with core are cord cores, and a small part of them are cord fabric cores. Since these two core structures are fiber twisted or woven, the inter-fiber shearing during the operation of the V-belt causes the core to gradually break and elongate. Therefore, ordinary V-belts produced with cord cores and cord cores can only be used in low-load transmission systems.
Special belt core—polyester tempered brown ribbon core
The belt core of the special belt core triangle belt adopts the whole solid rod-shaped belt core structure of polymer polyester tempered brown wire. Because the polyester tempered brown wire has a solid core and untwisted structure, it has good adhesion, flex resistance, high strength, and does not run long. It not only greatly increases the service life of the rubber transmission belt, but also has a balanced service life. It is maintenance-free and replaced regularly. On November 22, 2010, the polyester tempered brown wire skeleton material passed the appraisal of the expert committee: using polyester tempered brown wire as the skeleton material of the transmission belt and traditional polyester soft rope, hard rope, aramid and other fiber rope structural skeleton materials Compared with the transmission belt, the service life is increased by 5-10 times, which is the international leading level. The special belt core transmission belt effectively solves the problem of frequent replacement of ordinary transmission belts in the high-load and heavy-horsepower transmission system, and is highly favored by heavy industry enterprises all over the world.
Pros and cons
advantage
1. Simple structure, low manufacturing and installation accuracy requirements, convenient use and maintenance, suitable for occasions with a large center distance between two shafts;
2. Smooth transmission, low noise, and cushioning and absorbing vibration;
3. When overloaded, the transmission belt will slip on the pulley, which can prevent the damage of weak parts and play a safety protection role.
shortcoming
1. Can not guarantee accurate transmission ratio;
2. The outline size is large and the transmission efficiency is low.
Reference length
When the V-belt rotates and bends around the pulley, the layer whose length and width remain unchanged is called the neutral layer. Under the specified tension, the circumference measured along the neutral layer of the V-belt is called the reference length, also called the nominal length. It is mainly used to calculate the geometric size of the belt drive and mark the triangle belt, and its length has been standardized. In addition, the length of the domestic V-belt is also expressed by the inner circumference and the outer circumference.
component
Ordinary rubber V-belts are generally composed of cloth layer, stretch layer (top rubber), strength layer (tensile layer) and compression layer (base rubber).
The functions of different parts of Lai Bian Tou are as follows:
1. The wrapping layer, the wrapping layer is composed of plain weave canvas (mainly cotton canvas and polyester-cotton canvas) diagonally cut at 45°, which has excellent elasticity and friction, can connect various parts to form a whole, and protect others Part of it is not subject to wear and erosion, and can increase the stiffness of the V-belt.
2. The stretch rubber layer, which is composed of a rubber material with high elasticity and excellent stretch performance, can withstand the tensile stress of the V-belt when it is running and bend, and play a buffer and protection role for the strong layer.
3. The strong layer, the strong layer is the skeleton of the V-belt. The main types are polyester cord, polyester tempered brown wire, aramid cord and dipped cord fabric, etc., which are used to withstand the production of the V-belt during operation The tensile stress is the main stress part in the V-belt transmission process.
4. Cushioning rubber, polyester tempered brown ribbon core or V-belt with cord core around the strength layer, there is a layer of rubber with good adhesion strength with the core, which is the cushioning rubber, which acts as a fixing belt. The role of the core, and can absorb the dynamic shear stress generated by the frequent deformation of the V-belt during high-speed operation.
5. Compression rubber layer, the compression rubber layer is composed of a rubber material with excellent bending fatigue resistance. It can withstand the compression stress generated by the V-belt during operation and bending, maintain the rigidity and elasticity of the V-belt, and increase the cross-section of the V-belt. And the friction contact surface with the pulley, improving the transmission efficiency.
Due to the different functions of different parts, the rubber formula used is also different.
