Thread Content
1. The function of the supporting idler rollers is to support the conveyor belt and the materials on it, reduce the sag of the conveyor belt, and enable it to operate steadily. The main types of idler rollers include groove idlers, flat idlers, cushion idlers, and self-aligning idlers. Grooved idlers are used on belt conveyors that transport bulk materials; they create a grooved shape in the conveyor belt, thereby increasing its carrying capacity and preventing the material from spilling to the sides. Increasing the groove angle can increase the cross-sectional area for carrying cargo and prevent the conveyor belt from drifting, but it causes the belt to bend, which is detrimental to its lifespan. To reduce the additional stress on the edge of the belt, transition idlers with groove angles of 10°, 20°, and 30° can be used between the drive drum and the first set of grooved idlers, allowing the belt to gradually form a groove. Buffer idlers are used at the receiving end of belt conveyors to reduce the impact of materials on the conveyor belt; they come in types such as those with rubber rings and those with spring plates. Self-aligning idlers are used to adjust the lateral position of the conveyor belt, ensuring its proper operation. There are many types of self-aligning idlers; the simplest option for transporting bulk materials is to use trough-shaped, forward-inclined idlers. By tilting the two side idler rollers forward at a certain angle (usually about 3°) in the direction of belt movement, it restores the alignment of the misaligned conveyor belt. This method is simple, but it increases resistance by about 10%. There are also various types of self-aligning idlers such as conical, V-shaped, and inverted V-shaped ones, which can be selected according to needs. Tapered rollers: Suitable for use in conveying systems, conveyor belts on curves, and track-based conveyors. Double-groove rollers: Used in the hardware, electronics, and conveyor manufacturing industries. Roller manufacturing: Applied in machinery, food processing, electronics, the woodworking industry, mining, and other sectors. Powered rollers: Suitable for various powered and unpowered conveyor systems. Single-chain rollers: Used in various powered and unpowered conveyor systems. Unpowered rollers: Applicable in food processing, tobacco production, pharmaceuticals, rubber manufacturing, etc. Metal unpowered tapered rollers: Used in food processing, tobacco production, pharmaceuticals, rubber manufacturing, etc. Straight-tube tapered rollers with rubber coating: Suitable for loading, conveying, transporting, pulling, and providing power. 2. Braking devices: When stopping the conveyor while it is loaded, in order to prevent the conveyor belt from moving in the opposite direction due to the weight of the goods, thereby causing materials to flow back, braking devices should be installed at the drive mechanism, depending on the specific circumstances. Commonly used types include roller check valves, belt check valves, and disc brakes, etc. A roller check valve can be installed on the low-speed shaft of the reducer. It features a compact design, stable and reliable braking, and is available in various series; it can be selected according to the needs of the reducer. It is widely used, with a maximum braking torque of 48.5 kN/m. To prevent reversal or sliding when the skewed belt conveyor stops while under load, reverse gear or braking devices are added as appropriate, based on calculations of the braking torque. The roller check valve is suitable for use with head drums; it makes use of a reducer for power transmission, has a high power capacity, and features large drum diameters. It is appropriate for belt conveyors of the ZQ65 series or higher, and is well-suited for conveying materials upward on belt conveyors with an inclination angle of ≤18 degrees. Its advantages include rapid operation in reverse mode and a short reversal distance, making it the preferred check valve for medium and large-scale inclined conveyors. The belt-type check valve has a simple structure and low cost, and is suitable for upward conveyors with an inclination angle of ≤18°. When the skewed conveyor stops and reverses direction, the brake belt is wedged between the conveyor belt and the drum to exert a braking effect. The defect is that it reverses a certain distance first when braking, causing blockage at the feeding area and resulting in overflow. The larger the diameter of the head drum, the longer the reversal interval, so it is not suitable for conveyors that require higher power.