Conveyor Belt

Conveyor belt used in the process of several common problems-Sealand Industry CO.,LTD.

In 1, the conveyer belt joint why easy cracking, disconnect?

Conveyor belt joint strength than normal body strength to be low. General mechanical connection, joint strength can only reach the belt body strength4050%, cold glue quality is better, the joint strength can reach6070%, and hot glue joint strength can reach8090% ( joint method is correct, the quality defect ). Because the joint strength is relatively low, if the method of adhesive bonding is not correct, the strength of the joint will be low, such as surgery, polish, and a layer of cloth, excessive grinding, lapping length is insufficient, step number insufficient, rubber joint rubber performance is not good or has since sulfur failure, excessive grinding, wire rope wire rope rust, joint strength will be greatly reduced, when in use, prone to joint broken phenomenon.

In addition, the conveyer belt without the sealing adhesive, or glue joints in the wrong direction, position of joint prone to cracking ( plastic parts ).

In 2, the conveying belt is what reason?

conveyer belt during normal operation, the tape speed is not lower than the speed of the95% roller. If the roller and conveyor belt friction is not enough, the conveyor belt is prone to slipping phenomenon. The roller and the conveyor belt friction is caused by many reasons, there are common: Tension enough, load start, roller surface friction coefficient.

Tension enough reasons: the tensioning stroke is not enough, counterweight, the conveyer belt is long enough;

Roller surface coefficient of friction is not enough reason: the surface of the roller rubber wear is too large, the belt body too wet or stuck with lubricating oil, the surface of the belt body adhesive material (easily soluble rose ).

In 3, for bonding glue, glue storage what requirements?

The film, mortar should be kept in the dark, dry place, avoid direct sunlight, to avoid all kinds of radiation, and away from the fire source.

The film, glue should avoid preserved in dust larger establishments, avoid contact with various chemical substances.

Preservation film, mortar environmental humidity 50%-75%, temperature not lower than 5DEG C, not more than 35 DEG c..

The film, mortar preservation period:1months of summer, winter, spring and Autumn period of 2 months to 1 and a half months.

4, the method of adhesive bonding tape?

I suggest the conveyor belt adhesive using hot glue glue stick glue, the need for intermediate core, each step can only have a layer of cloth, joint direction to follow the conveyor belt running direction.

In 5, a wire belt intermediate longitudinal tear14-15meters, how repair?

The damaged parts of upper and lower cover rubber strip ( all length beyond the damaged part of50-100mm, the width of more than the damaged part of3050mm ), while a section of the same size and stripping parts rubber (preferably with a layer of cloth layer ), and then in accordance with the cold glue method can be repaired.

6, hot glue stripping mode ( end edge rubber to remove OK )?

This is another kind of adhesive bonding method, this method is also possible, but if using this method, we should pay attention to the following points:

A, must adopt sealing glue;

B, edge rubber parts intersecting joint position must be adopted for vulcanizing rubber;

C, rubber connecting parts must be polished

Disadvantages, if not handled properly, edge rubber parts easily damaged.

In 7, the EP high temperature zone and high temperature zone between cotton canvas:

A, the same point: the same surface cover rubber.

B, different points: cotton canvas capable of the highest temperature of 150 DEG C; EPTNG canvas can be used for a long time under the condition of 200 DEG C, the highest available at 220 degrees C under the conditions of use;

Cotton canvas intensity is relatively low, only 50N / mm; EP – TNG canvas relatively high intensity, commonly used type 200 for200N / mm;

Cotton canvas high temperature with low adhesion, EP high temperature with high adhesion;

The EP high temperature belt’s life was often in cotton canvas high temperature zone.

8, different manufacturers of core glue can mix?

Not recommended to be different manufacturers the core rubber mix, because different manufacturers of core adhesive formulations are not the same. Rubber compounding agent of many different types, some will have interactive response, in the same factory formula, does not appear to have adverse interactions with the agent, but different manufacturers recipes vary greatly, from different manufacturers of core glue together, there may be a complexing agent interaction reflected, effects of the use of plastic core effect of.

Joint9, the temperature reached 120 degrees, but did not reach normal temperature OK?

No way. Rubber normal curing temperature is composed of rubber curing agent and promoter decision, general manufacturers in order to ensure the safety of rubber processing, will not be used rubber conveyor belt set very low starting temperature. Therefore, when the temperature reached 120 degrees circumstances, rubber will not enter the normal curing condition, therefore, in120cases, the conveyer belt joint quality will be greatly affected.

Usually in the curing temperature is higher than the accelerator, curing agent and curing temperature less than the normal temperature, can be taken to extend the vulcanization time method, which can meet the requirement of rubber vulcanization. A general temperature lower than 10 DEG C, vulcanization time period of 2to 4 times.

Of course, for performance reasons, we do not recommend the use of low temperature long time curing method.

10, why is the density, fabric thickness?

Mat density, thickness and cloth varieties, strong registration relation. Because of the different fiber modulus, strength is not the same, so to reach the required strength, must adopt different diameter, different denier fiber, yarn, hence the fabric density, thickness difference, generally speaking, polyester nylon to nylon to dense, coarse; high strength cloth than low strength the dense, coarse cloth.

11, why other construction units generally do not advocate the use of sealing glue?

Sealing adhesive function is mainly to vulcanized together two ends, while also preventing water and other harmful medium invasion, prevent destruction of joint cleaning device. Therefore, in order to make vulcanized joint life along with the band, to extend the life with a body must use the sealing glue.

The use of sealing glue joints vulcanized will increase the cost, but also improve the adhesive joint of difficulty, so some construction units would not advocate the use of sealing glue. Actually do so, for the service life of the conveyor belt has a negative effect on.

12, can not put the core rubber, and the coating layers of glue?

Mucilage is the core adhesive is dissolved in a solvent to form with a certain viscosity of colloidal material. The solvent evaporates, its composition and core rubber are exactly the same, however, commonly used mortar is core glue and solvents ( such as toluene, xylene, solvent gasoline ) according to the1:51: 6proportation. Core adhesive is after rolling machine rolling film, its molecular order is the result of orientation, from a mechanical perspective is anisotropic, so along the rolling direction of the tensile properties, fatigue resistance are good. While the solvent in the rubber molecular alignment is random, with isotropic. Mortar is used by solvent good fluidity, permeability that is soluble in the solvent rubber can fully into the fabric, so that the rubber and fabric better together. Therefore the core rubber that is the role of the conveyor belt fabric layer bonded together, at the same time eliminated due to different due to the thickness of the conveyor belt interlayer stress, deformation of the differences, and to absorb part of destructive energy, so the core glue in the conveyor belt is an indispensable part of, some foreign manufacturers in order to prolong the service life, often adopts thick core adhesive thickness method.

Using only the brush glue without core glue, then the joint cloth layer adhesive thickness relatively thin, its effect will be affected.

13, pull head, found the glue are enclosed in a layer of cloth, and another layer of cloth is light, why? ( is it right? Two cloth layer rubber material as much effect best? )

There are enclosed in a layer of glue cloth on which there are several reasons:

A, adhesion is not good

B, the adhesion is good, but the adhesive strength of higher

Generally speaking, nylon belt, part of the EP with pull head, relatively easy to appear two times with adhesive, and adhesive thickness is almost the case, while cotton canvas belt is easy to occur above a layer of cloth attached with glue, another layer of cloth is light in this situation. Of course, part of the EP poor adhesion with or adhesion is better but glue of high strength EP belt will also appear in this situation.

14, why does it feel joints than in other parts of the hard?

Conveyer belt vulcanizing bonding process is actually has been vulcanized rubber to crosslinking process. Since sulfur need heating, pressurizing, and takes a relatively long time, after a relatively long time after curing, to vulcanized rubber hardness will increase, so will feel joints than in other parts of the hard.

In 16, the deviation of edge edge rubber wear and leads to the cloth layer delamination, how to deal with?

The delamination area is not the case, can take cold adhesive for repair, but must pay attention to make air evacuation.

Of course, the best approach is found in the conveyor belt running deviation correction.

In 17, the roller rubber wear can cold glue processing or hot glue processing?

Roller rubber wear after the spot can be cold treatment, but the treatment effect is not good. After the heat treatment roll package of plastic can be used for more than 5 years, not because of the unexpected result of roller plastic packets loss.

The 18layers of cloth, as the two conveyor belt to butt?

In general can not be used this way. But in some unexpected situations, the need for emergency to take this approach. Using this method, better put a layer on the two layer of a seam is placed on the bottom, and the sealing glue to put enough material to eliminate inconsistent thickness, both ends of the conveyer belt joint effects.

In 19, EP and NN with what the advantages and disadvantages of each?

NN conveyor belt is cotton canvas conveyor belt of alternative products, with high strength, fatigue resistance performance advantages, but in the process of using NN conveyor belt use extension rate is relatively large, easy to elongation;

EP is a NN with the upgrade, it has the advantages of nylon conveyor belt, and because in the course of the extension rate is relatively small, so the scope for more extensive. But EP canvas and rubber adhesive performance than NN canvas, thus cementing safety aspects of EP than NN conveyor belt conveyor belt

In 20, a long conveyor belt easy deviation?

The conveyor belt in the operation process, sometimes the deviation phenomenon. In general, the belt itself problems caused by the belt deviation situation does not see more, the deviation of the conveyer belt conveyor main or reason. Conveyor roller does not parallel, due to stent is not vertical, the reason of roller rotation is not flexible, can cause the belt deviation. For relatively short conveyor belt, due to unilateral roller rotation is not flexible and some other factors of relatively large probability, conveyor belt deviation is more likely, but a long conveyor belt roller, due to the increase in the number of unilateral effects, asymmetry would be reduced, therefore in the conveyor belt shown on the deviation phenomenon less.

Of course, individual exceptions, such as: aligning roller swing is not flexible or fixed inclined, the roller surface is not very clean, can cause the belt deviation.

In 21, the conveyor belt above and below no deviation deviation what caused it?

Conveyor belts on both sides are mutual influence and mutual independence. In general, the lower supporting roller parallelism, drum level enough will cause lower deviation of conveyor belt. Lower deviation, and the upper side of the normal situation basically is due to poor cleaning device, lower roller sticky material, weight, or weight support roller does not parallel oblique, lower rollers are not parallel to each other by the specific situation, according to the actual situation to adjust. Generally speaking, the lower deviation can be corrected, can improve cleaning device working status, removing roller, roller stuck on the material, adjusts the underside Pinto roller, the lower V type roller, or install underside self-aligning roller to achieve the purpose of correction.

22, why rainy days easy deviation?

On rainy days, the open conveyor belt easily stained water, conveyor roller, roller is relatively easy to damp. Rubber and metal wet friction coefficient is relatively small, if the roller rotation is not flexible or roller surface adhesive material, so the conveyor belt roller in by force will not balanced, or on both sides of the roller resistance is inconsistent, then, the conveyor belt running deviation would be out of balance.

In addition, the roller surface adhesive can be dissolved in water swelling material, roller and the conveyor belt between the water film thickness will increase, prone to slipping phenomenon, so that the conveying belt deviation.

In 23, the joints found in longitudinal joint and how?

The longitudinal direction of the conveyor belt joint occurred mainly in the wider or very narrow conveyor belt, rubber joints in time, more prone to longitudinal joints overlapped condition. Different adhesive technology, by the longitudinal joint effects are not the same. If the conveyer belt adopts process is not overlapped, so the longitudinal joints of basically not joint adverse effects, if overlapping, the joint will appear the problem of large local thickness.

In the operation, to the attention of a layer of a layer of clear, monolayer within the stripped to all stripped, the stripped not residual, cannot touch it.

In 24, after vulcanization joints cracking, can use cold glue repair?

Can. After vulcanization joints cracking, in treatment, will need to clean conveyor belt processing site, and will be fully cracked part of gas drainage, no exhaust gas, can put a hole in the belt body, and in good repair will be drawn to fill. Can also be made by cracking, the adhesion is good, or hot patching method will be cracking site repair.

25, how to determine the length of the joint?

Joint length determination according to the framework material of the conveyor belt, the variety of layers and effective width of vulcanizing machine, vulcanizing machine to meet the effective width of the joint length as large as possible, and to meet the requirements of the problem4, in a vulcanizing machine length cannot be met, can use two sets of vulcanizing machine. Vulcanization, and in two the vulcanizing machine intersection connected place related materials processing, to ensure the smooth transition of two sets of vulcanizing machine.

In 26, NN, EP how to distinguish?

NN, EP conveyor belt is the difference in appearance:

Same strength grade of NN conveyor belt, EP belt, NN belt relatively thin point, from the cross section yarn lines relatively compact fault point, EP conveyor belt yarn from the side bending degree is relatively large, the distance between the two peaks of relatively large. In addition, NN conveyer belt body relatively soft point, EP relatively hard point.

In 27, the conveyor belt after elongation in use, can be in the back?

The conveyor belt in use during elongation, which is part of the elastic elongation, the external force is removed to restitution, another part is the skeleton material for the preparation of contraction of the elongation, this part is not restored. Commonly used fabric core conveyor belt conveyor belt, EP elongation is relatively small, while the NN conveyor belt elongation is relatively large, and in the use process, the NN conveyor belt because of nylon fiber after stress creep is relatively large, so in the use process, elongation ratio increase, but also because the fibers of the creep, so the force cancellation to shrink back, volume ratio of elongation of small.

In 28, the counterweight have a request?

Under normal circumstances, the counterweight is root Zelkowa acuminata conveyor belt running circumstances, and the need to follow a principle: in skid premise, the lighter weight.

Influence of many factors: the counterweight balance position is reasonable, main

 

Sealand Industry CO.,LTD.     http://www.cnconveyorbelts.com/company-profile.html

On the influence of grain conveyor belt-Sealand Industry CO.,LTD.

Conveyer belt in China since the 2O century time step of chemical fiber fabric core era, nylon ( NN ) and polyester / Polyamide ( EP ) fabric core conveyor belt has become the mainstream. With the grain is in the production of NN and EP fabric core belt is easy to produce in the typical quality defects.

Grain is a kind of vertical water ripple, appearing in the strip full-length or partial. From a cross-sectional view, where a smooth part, with the cloth layer of wavy deformation, slight concealed in the adhesive layer inner surface, without obvious performance; severe upper and lower cover rubber also moves up and down along the concave and convex. Because it is in the curing process, has been established, so it is very difficult to repair it. On the conveyor belt, along the grain is not only the general appearance quality problems, it will seriously affect the service life of the band. Adhesive tape in use, cover glue along the lines occur crack, cause the cover layer of early deterioration of damage.

As a result of working face and the operation surface cover rubber thicker. In a smooth local thinning will also accelerate the cover adhesive wear. In the smooth areas, conveyor belt strength to loss of 2O% ~ 4O%. Layer and the cloth layer of the adhesive force between also fell to about 4O%. A longitudinal conveyor belt service life up to10000h to 2000~ 3000h.

                                  Conveyer belt

In addition, a smooth Conveyer belt joint is also difficult. Then after a good is easy to loose off, resulting in downtime and head loss. Therefore, with the grain is a waste product defects, is a Conveyer belt manufacturers must avoid and solve problems.

Sealand Industry CO.,LTD.  http://www.cnconveyorbelts.com/company-profile.html