ZhongBo Industry and Mining Machinery Co.,Ltd is mainly engaged in the r&d, manufacturing and sales. Leading products are common, heat-resistant (high temperature), acid and alkali resistant, oil resistant, cold resistant, wear resistant, different properties such as general flame retardant cotton canvas (CC), nylon (NN) conveyor belt, polyester (EP) flat and large dip Angle gear sideband, with decorative pattern, such as conveyor belt. Below to introduce the structure principle of the conveyor belt, deepen everyone's understanding on the conveyor belt.
Rubber conveyor belt structure is more convenient to be understood, it is mainly for the rubber material of the cover rubber surface, wrapped in belt core framework of both sides, with isolation layer of adhesive content, will cover the glue and the conveyor belt; Together. Rubber conveyor belt is mainly for these parts.
Ordinary conveyor belt body has excellent features such as smooth, flat surface, we in the structure in principle can be divided into the following sections:
(1) cover conveyor belt layer. Is divided into the upper rubber layer and the lower rubber layer, respectively attached to the belt core layer, outside environment through the use of the customer to determine whether to need to use oil resistant conveyor belt, cold resistant, flame resistant, heat resistant rubber composite material with raw materials.
(2) inner core conveyor belt center. This is the main part of the conveyor belt, it is under high load intensity, according to the mechanical strength of conveyor belt to match different materials such as canvas, nylon fabric, polyester NN, EP, cable filling material, which can produce conveyor belt core into single layer or multi-layer structure.
(3) part isolation belt layer. It is used for bonding core conveyor belt belt, rubber conveyor belt according to the core is different to the material, including its rubber cover can be selected according to the following standards:
(1) ordinary wear-resistant conveyor belt use natural rubber and styrene-butadiene rubber mixing smelting.
(2) the resistance to high temperature (> 150 degree), 3-20 choose neoprene and three yuan, the highest under 200 ~ C.
(3) the fire resistant belt use chlorine diao 'diene practice, styrene-butadiene rubber and natural rubber mixing, add flame retardant.
(4) oil resistant belt use chlorine j. diene and styrene butadiene rubber (NBR), if a mixture of polyethylene and antioxidant.
Conveyor belt cover glue except has outside the rubber formula above, also can be made into various forms of surface structures, such as all decorative pattern, concave or convex circular holes, herringbone groove belt and so on, these all belong to the scope of special conveyor belt. Rubber choice determines the nature and the skeleton of cover rubber combination ability, therefore, will all kinds of physical and chemical characteristics of natural rubber and synthetic rubber.
Second, the core conveyor belt
Due to the rubber elasticity, low elastic modulus, with core is easy to produce deformation under the external force, mainly used in textile materials:
1. All kinds of fiber performance comparison
Cotton fiber is the basic feature of wet strength is higher, low dry strength, low elongation, and rubber has a good bonding effect, poor heat resistance, fatigue resistance, strong sexual difference, with thicker fibre. It is one of the lowest intensity in conveyor belt.
Artificial fiber and viscose fiber, compared with the cotton fiber, it is high strength, good thermal conductivity, heat production, fatigue resistance, high initial modulus of elasticity, good dimensional stability, but the moisture absorption, and moisture absorption intensity bigger decline.
Polyamide fiber, and become a nylon material, the conveyor belt often USES nylon 6 and nylon 66, compared with cotton and man-made fibres, is 1.6 1.9 times higher strength, low hygroscopicity, large deformation, shrinkage, dimensional stability is poor, poor combined with rubber.
Polyester fiber, commonly known as polyester, but slightly lower than nylon with higher intensity, low elongation, good strong, good heat resistance, good fatigue resistance, size stability is good, but wearability is inferior to nylon, combined with rubber sex is bad, but it is a combination of synthetic fibers and nylon material integrated features.
Poly (vinyl alcohol) fiber, also called vinylon, strength and elastic modulus than the nylon, poor heat resistance, wet strength decreased rapidly.
Glass fiber, such as strength calculation according to the ratio, the highest strength of glass fiber, high initial modulus of elasticity, elongation is very low, the relative density is big, is not moisture absorption, good heat resistance, corrosion resistance, electrical insulation and thermal insulation is good, shortcomings is not wear-resisting, not fatigue resistance, combined with rubber sex differences.
Aramid, aramid, commonly known as a synthetic wire said. It had many advantages, such as synthetic fiber and steel wire of the relative density is small, good chemical corrosion resistance characteristics.
Steel wire cord, its high strength, low elongation, usually only 0.2% ~ 0.2%, it arranged evenly spacing, embedded in the rubber cover.
To sum up, nylon and polyester have good fatigue resistance, high strength and weight, especially for strength particularly wide range of conveyor rubber belt, heat setting and after dipping, they under working load, can very good adhesion to rubber, low elongation, but high elasticity of polyester is used in the design of the deep slot form belt warp and polyester percentage elongation is less than 1%, the nylon is 3% - 3%. The former is suitable for long distance transportation, the latter is suitable for arc running.
2. The weaving methods affect intensity
Nylon as parallel compilation of plain or Oxford fabric belt core, against impact and resistance to tearing, into a slot are good, the smaller relative density will, make into low radial crepe shrink core structure, can improve its tensile properties, with strength of up to 700 kn/m. Here to Oxford or fabric, in plain weave fabric, radial two root make together, instead of the grain structure of 2 x1 table group, commonly known as for Oxford, organization, also can use of course 2 root parallel lines form a 2 x2 table, or 3 X 3, 4 X 2, and so on, can have the high resistance to tear strength.
Under the condition of the conveyor belt length must, quantity, the higher the elasticity and the transition period will be longer; The smaller the elastic modulus, the transition period will be shorter. For small modulus of nylon and steel wire rope for big modulus, elongation is very big, the former the latter elongation will be reduced.