With 1/2 3, the street length is calculated: G1h/G2.k formula: L - joint length (CM) G1 - Bradley (N/cm G2) - cord adhesive shear force (MPA) H - belt core number /K - Insurance coefficients of 4, joint production and processing production form (ladder) m
With 1/2 3, the street length is calculated: G1h/G2.k formula: L - joint length (CM) G1 - Bradley (N/cm G2) - cord adhesive shear force (MPA) H - belt core number /K - Insurance coefficients of 4, joint production and processing production form (ladder) making tools: 1.35P hammer, screwdriver, piercing Nutcracker, hacksaw, tape, wire, cutting tool. The number of steps and the number of cuts are determined according to the number of layers of the conveyor belt. Process: according to the number of layers of the conveyor belt to determine the number of steps, marking, cutting, peeling and polishing, and using the thinner to clean the sticky surface, baking with infrared rays, drying and gluing. Preparation and operation method of 1, conveyor belt adhesive and curing agent are mixed according to proportion mix mortar, three painted on the joint surface drying, after solvent evaporation (if using infrared light or iodine tungsten lamp can accelerate the volatilization of solvent) to film touch not sticky, sticky and sexy, then 2, adhesive bonding when the interface is aligned with the hand on the stick back, from the middle to push back and forth around 2-3 times, the exclusion of air. 3. After the joint has been glued for a period of time and cooled to room temperature, the site can be cleaned and loaded. If the curing time is prolonged, the bonding effect is better.
Note a summer belt bonding, "wet days stick" phenomenon in the summer we live when bonding conveyor belts, especially after the rain of adhesive bonding, surface adhesive brushing after drying, often there will be a layer of white mist, when brushing glue often found no adhesive joint strength, not stick, form "wet days stick" phenomenon. This is because after the summer or under the rain, the air humidity, the adhesive solvent will take away a lot of heat from the surface of the adhesive layer in the process of evaporation, so that the water vapor in the air condenses, forming on the surface of the water mist, and fog formation interface adhesive oil interface is not compatible, various chemical form the interface between the two is very small, the joint surface bonding strength of the adhesive failure caused by no. To solve such problems, should be taken by baking, heating, remove surface water mist, to dry until sticky sticky hands and a sense of cohesion when you can glue.
Two, "dry wet" phenomenon in the use of conveyor belt adhesive, in particular the use of flame retardant adhesive in the summer, we often feel dry on the surface of the adhesive layer, but after fitting joint easy peeling, and the adhesive surface layer touch with viscous, the formation of "former dry wet" phenomenon cause, not stick or stick is not strong. This is due to the high temperature in summer, the adhesive solvent is faster than in winter, and we take the adhesive surface glue in conveying polished, part of glue to the conveyor belt inside penetration, formed like a rivet as a riveting point, this part of the glue solvent volatilization is slower than the surface the volatile, high drying temperature in the fast environment often surface to dry thoroughly, and the inside of the solvent is not fully volatile, so in the joint after fitting, inside the solvent will volatilize slowly, over a certain period of time will destroy the wetting adhesive layer, adhesive surface, affect the bonding effect. To eliminate the above effects, we should ensure that sufficient drying time or baking time is guaranteed during the first brushing, and that the solvent in the gum solution is sufficiently volatile to form a stable adhesive layer
Three, "the head" phenomenon in the process of bonding conveyor belt joint, two fierce and sometimes by the bonding process to finish all process, also found no joint to peel the joints, found no sticky glue adhesive layer, the surface of hard, shiny, this is the "dry head" phenomenon. This is the brush glue hanging or baking process, in order to ensure full of volatile solvents, ensure fully cured adhesive, too much longer hanging or baking time, the adhesive has been completely cured by fast or completely cured, intermolecular force and chemical interaction of two layer make the joint surface when becomes very small, resulting in joints not stick. This requires us to set in the dry or baked, according to the actual situation of the temperature and weather control, the right time, both to ensure the penetration into the conveying belt in the volatile solvent, and also makes the glue and adhesive, ensure that the first fully dry gel second times, third times, pay attention to dry sticky glue the viscous force sense can adhesion.
Four, the influence of the thickness of the adhesive coating layer is too thin, viscous contact will cause lack of glue, which part of the force, but also penetrate into the conveying belt inside the glue can not form enough riveted joints, the solidified strength is not up to the requirements, thereby causing the adhesive failure. Brushing glue is too thick, although can guarantee enough glue penetration to the conveyor belt to go inside, but the formation of the elastic adhesive layer is too thick layer after curing, easy deformation in the process of stress, and the stress concentration in the internal layer, not evenly distributed to the conveyor belt and the adhesive interface, cause cohesive failure, affect the bonding strength. The appropriate thickness of the adhesive layer in general to cover all the bonding surface, adhesive layer based, to maintain the thickness of 0.5-1mm is appropriate, the use of rubber to 0.8-1kg/m2 prevail.
Five, hammer pressure affect the bonding after bonding, hammer with adhesive joint hammer. Hammer pressure, first of all to push the bonding layer, in order to discharge the adhesive layer bubble. Beat to pounding from the adhesive surface of the centre to the periphery, beat to ensure uniform, the adhesive surface of each point to stick to force uniform. Can not readily beat, too light, can not play the hammer pressure effect, and uneven adhesion, uneven force, resulting in sticky defects.
Six, adhesives affect the use of adhesives in the process, the adhesive itself will also have a fatal impact on bonding. Such as viscosity is too large, difficult to infiltrate, prone to interface failure; filler size is too large, resulting in stress concentration; two component adhesive deployment uneven; curing agent too little amount, not fully cured.
Seven, bonding process influence in the adhesive quality assurance premise, bonding process is also a very important factor, it can be said is the key to the success or failure of bonding. Mainly include: 1, the conveyor belt surface is not dry, residual moisture. 2, without degreasing, cleaning first sanding, surface treatment is not good, there is damage to the interface. 3, surface roughness is not uniform, forming point contact. 4, after surface treatment, parking time is too long. 5, it is affected by uneven pulling force. 6, ignoring the influence of environmental chemical media.