How to choose repair strips and repair glue for conveyor belt repair

Compared with steel ribbons or whole core belts, nylon conveyor belts are relatively simple and easy to repair. If there is a hole in the nylon conveyor belt, the construction personnel mostly use the rubber repair agent at the hole part to fill, and then attach the repair strip up and down to carry out on-site cold vulcanization repair treatment. The specific repair methods are as follows: first, use a high-power angle grinder with tungsten steel disc to polish the upper and lower parts of the hole, and then use cleaning agent to clean it; Apply cold vulcanized glue and SK313 to the lower part of the belt and the adhesive surface of the RIT repair strip (in the case of repair strips, it is recommended to use a fabric reinforced repair strip to repair the damaged fabric part), and then attach the repair strip to the lower layer; Fill the rubber repair agent in the hole, use a scraper to scrape flat, and then apply cold vulcanized glue on the upper layer of the belt, the operation steps are the same as above, after the repair strip is laminated, use the pressing roller to roll it firmly.

There are many ways to repair the conveyor belt, and you need to choose the appropriate maintenance plan according to the damage of your conveyor belt, such as 1. The wear on the surface of the belt can be repaired with "rubber vulcanization repair agent", which only needs to be polished and cleaned on the worn surface, and the rubber vulcanization repair agent can be applied to the surface to complete the repair. 2. The belt can be repaired on-site with a rubber repair strip with a blue CN adhesive layer, and SK313 cold adhesive can be used for on-site repair. In addition to these two, of course, there are many maintenance solutions, and it is necessary to choose the appropriate maintenance plan and suitable maintenance materials according to the damage of the conveyor belt on site to meet the requirements of customers.

If you are a rubber conveyor belt, the damage range is small, you can now repair the small package repair agent by yourself, if the damage area is large, you can ask professionals to operate to avoid the consumption of time for your own production.

There are many reasons for damage to rubber conveyor belts, such as cleaning cleaners, collisions of materials, many bends of the conveyor belt, damage to the idler, belt slippage, illegal operations, etc. Therefore, the damage of the rubber conveyor belt is also different, such as some scratches, longitudinal or transverse fractures, etc., the degree of damage is different, and the repair method is also different.

There are two commonly used methods for repairing damage to rubber conveyor belts, namely cold vulcanization repair and hot vulcanization repair. It is necessary for us to choose the appropriate repair method according to the conditions of the working conditions on the site.

One. Cold vulcanization repair operation process:

1: Polishing the damaged surface.

Use a repair strip that is 2-3cm wider than the damaged part, draw a marking line with the damaged part as the center, and prepare for sanding. Then polish the wound site until the surface of the injured site shows a certain curvature and there is no protrusion.

2: Clean the damaged surface.

The grinding surface is cleaned with a cleaning brush, and the grinding surface is deeply cleaned with cleaning agent SK353 until it dries.

3: Apply cold adhesive.

The damaged surface is coated with cold adhesive SK313 for the first time, and the second cold adhesive SK313 is applied after it is completely dry, and the adhesive surface of the semi-vulcanized layer of the repair strip is also painted with cold adhesive SK313, and the bonding can be started when the two are slightly sticky to the back of the finger.

4: Attach the patch strip.

The adhesive surface of the repair strip is laminated along the damaged surface, and air entrapment is avoided as much as possible during the lamination process.

5: Compacting the adhesive surface.

Compaction rollers are used to roll from the inside to the outside to exhaust and compact the air from the repair surface.

Two. Hot vulcanization repair operation process:

1.Draw the connector line.

According to the size of the damage of the conveyor belt, at least 15 20mm larger along the perimeter of the damage, draw a cutting and repair line, cut at an angle of 45 degrees, and peel off the damaged cover glue, and be careful not to damage the cloth layer or steel wire layer below when cutting.

2.Burnish. The damaged part of the conveyor belt is deeply polished with an angle grinder and tungsten steel grinding disc, and it is recommended to polish 3mm.

3.Cleaning. The sanded conveyor belt is cleaned with SK823 to ensure that the surface of the fabric layer or steel wire layer is clean.

4.Use a brush to evenly apply a layer of hot vulcanizing agent SK823 on the surface of the cleaned fabric layer or steel wire layer, which is required to be evenly and completely, without leakage, and let it dry completely.

5.Glue spreading. Spread the brushed tape with RIT core glue and RIT surface adhesive, and try to spread it flat when laying it to avoid bulging.

6.Vulcanization. Pressurized, heated vulcanization is performed using a hot vulcanizing patcher or vulcanizing press. After the vulcanization time of the rubber conveyor belt vulcanization joint is reached, the vulcanization temperature must be reduced by 40 or less by way of pressure holding and cooling before it can be opened.

After the rubber conveyor belt is damaged, we should cooperate with the construction personnel to choose the appropriate repair method according to the working conditions and environment of the site. If the site is in a hurry, you can choose a cold vulcanized joint that is easy to operate. If the joint time is sufficient, or the tension of the belt joint is relatively large, it is still recommended to use the hot vulcanized joint for repair.

It is inevitable that various damage will occur in the process of rubber conveyor belt in the process of use, such as various strip-shaped sharp tools mixed in the process of material transportation, such as welding rods, steel brazing, etc., which may be embedded in the conveyor belt at any time and cause longitudinal tear (especially easy to occur on the circular tubular conveyor belt and wire rope core conveyor belt), or the use of mechanical belt mouth off, roller damage, wire rope core exposure and blanking gear edge damage, etc., resulting in the conveyor belt deviation, can cause longitudinal tearing of the conveyor belt. It is relatively easy to repair the above defects with rubber patches, which is faster and more economical than vulcanization repairs. The rubber repair agent is a pre-polybased compound, which is a two-component liquid at room temperature, which is self-vulcanized into polyurethane rubber after being mixed in proportion, cured and formed at room temperature, and has good bonding with conveyor belts and metal bodies, and the body has high elasticity, high wear resistance and high toughness.

Rubber patches are effective in repairing longitudinally torn rubber steel core tapes, but they cannot be used as binders. For the local damage on the surface of the conveyor belt, when the diameter is not greater than 1 5 of the bandwidth, the conveyor belt still has sufficient overall strength, and it can be repaired with repair fluid without leakage. The repair process is a three-step process:

1) Surface treatment The purpose of surface treatment is to make the repair agent better bonded to the conveyor belt skeleton. Grinding the break to a 60° 90° bevel and cleaning the surface is the key to a successful repair. In operation, according to the damage situation, cut into different cutting grooves, it is best to use a grinding wheel to polish, and use cleaning liquid (such as acetone) to clean and clean.

2) Glue adjustment and repair: Use a liquid repair agent, mix the resin and curing agent in proportion, stir evenly, and apply it in the groove. The general curing time is a few minutes to ten minutes, and the repair work must be completed before curing, and the groove should be larger, so that the repair agent can glue the undamaged cover. (3) health curing repair agent in the groove self-vulcanization, to obtain its physical and chemical properties and the bonding effect with the matrix, generally at room temperature for a few hours to a few days, the first few hours for the basic vulcanization, can reach the complete curing of 70 80 degree, a day that is, 24 hours can reach 90.

When the ambient temperature rises, the curing time is significantly shortened, and thermal insulation or heating and curing measures need to be added when placed in winter outdoor construction.

There are currently three main practices for conveyor belt repair:

1.The hot vulcanization method has a good effect, the speed is slow, and the process is complex2The rubber method has a general effect, fast speed and simple process.

3.The polyurethane spraying method has good effect, fast speed and simple process.

At present, the polyurethane repair method is very commonly used in foreign countries, which represents the German UNIKS portable conveyor belt repair gun, which is mainly used for spraying or pouring two-component conveyor belt repair glue. The use of this repair gun can be very convenient for the repair of the conveyor belt, this way is more convenient than the traditional way of scraping, faster, two-component repair adhesive mixing better, more uniform thickness, better surface finish and so on.

Conveyor belt repair is generally repaired by cold vulcanization, and the belt can be repaired by RIT repair strips, and the belt can be repaired by applying cold vulcanized adhesive SK313 to the damaged parts of the belt and attaching the RIT repair strips to the damaged parts of the belt. Contractors usually use RIT repair strips for quick belt repairs, which can ensure that they are ready to use and reduce the downtime of the conveyor system.

How to use RIT patch strips.

Step 1: Select a repair strip that is 2-3cm wider than the damaged part, and mark the contour line with the damaged part of the belt as the center;

Step 2: Use a high-power low-speed angle grinder with tungsten steel disc to polish the damaged parts, and the grinding thickness should not be less than the thickness of the repair strip;

Step 3: After the grinding part is cleaned, apply the cleaning agent to deeply clean the damaged surface to ensure the wettability of the glue;

STEP4: Brush the cold vulcanized adhesive SK313 on the damaged surface, dry it and brush it again, and dry it until it does not stick to the quilt;

SETP5: Apply cold vulcanized glue to the blue adhesive surface of the patch strip and dry it until slightly sticky;

Step 6: Attach the repair strip to the damaged part and use the compaction roller to compaction;

Step 7: After the repair is completed, apply cold vulcanized adhesive to the edge of the repair strip to allow the RIT repair strip and the repair part to vulcanize naturally.

Conveyor belt repair is divided into: hot vulcanization repair and cold vulcanization repair.

Cold vulcanization repair adopts German cold vulcanization technology, which is fast repair, high bonding strength and good wear resistance.

High-strength rubber repair agent can be applied to the emergency repair of conveyor belt surface damage, the filling of belt body defect structure after tear and scratch, and the treatment of pulley lagging interface, which is a new and efficient rubber repair process on the surface of conveyor belt.

In the continuous continuous operation of the conveyor belt repair work, the shorter the repair time can of course recover more losses, in the actual production activities, it has been proved that hot vulcanization repair can not be used as a commonly used belt repair means, and the mechanical buckle fixation will damage the belt, repair a cut at a time, and finally need to connect a new belt from the new belt, no matter from the repair rate or economic point of view, it is not a good belt repair method.

High-strength rubber repair agent is a type of high-strength rubber repair agent with fast curing speed, good adhesion and high strength. After curing, the comprehensive performance is good, the surface is smooth, high strength, high toughness, wear resistance, medium resistance, aging resistance, and easy operation. It has excellent acid and alkali resistance, chemical corrosion resistance, and good filling of belt repair materials.

High-strength rubber repair agent is suitable for filling repair of longitudinal tears in steel cores, whole cores and ordinary conveyor belts, as well as the repair of conveyor belt surface wear, block dropping, belt edge wear, belt surface perforation and joint sealing, as well as the repair of other polyurethane composite pipes, cables, rubber rollers and other rubber products.

Of course, the strong belt can use rubber repair agent, we are now using SK358 rubber repair agent, usually mainly to repair some belt plane scratches, cracks, etc., but also see the construction team also use this rubber repair agent when doing drum cold lagging.

It's easy to use.

The surface of the conveyor belt is polished and cleaned, and the AB components are mixed with cleaning agent and cooled dry, and stirred evenly in the same direction.

Pour the mixed liquid into the area to be repaired and use a scraper to smooth it out.

Wait for 2 hours or after the surface is dry, you can turn it on and use it. The waiting time is temperature dependent.

The operation process of the conveyor belt patching strip:

1. Use a ramimtech repair strip that is 2-3cm wider than the damaged part, draw a marking line with the damaged part as the center, and make preparations before grinding.

2. When grinding, it is recommended to use a high-power low-speed angle grinder [Ramimtech-L1202] with RIT tungsten steel disc to polish the surface that needs to be repaired. The grinding depth of the interface should not be less than the thickness of the repair strip [for example, the thickest part of the 150 reinforced repair strip is, then the grinding depth should be so as not to be scratched by the cleaner.

3. Clean the polished surface with high-efficiency cleaning agent SK353 and dry it.

4. While waiting for the cleaning agent to dry, the mixing operation of cold vulcanized adhesive SK313 and hardener UT-R40 can be carried out to make the two materials evenly mixed.

5. Brush the mixture of cold vulcanized adhesive SK313 and hardener UT-R40 on the entire repair surface and dry until it does not stick to the back of the finger. When applying, remember to apply evenly and with the same thickness.

6. Brush the mixture of cold vulcanized adhesive SK313 and hardener UT-R40 on the blue CN adhesive surface of the RIT repair strip and dry it until it feels slightly sticky.

7. When pasting the RIT repair strip, use the compaction roller for compaction.

8. After the repair is completed, the connection part of the RIT repair strip should be brushed with a mixture of cold vulcanization adhesive SK313 and hardener UT-R40 to make the CN layer on the edge of the repair strip naturally cold vulcanized.

Conveyor belt repair strip in the paste need to pay attention to the details:

1. Whether the grinding area meets the pasting area of the repair strip.

2. Dustproof and moisture-proof.

3. Whether the glue meets the requirements of pasting.

4. Whether the glue is matched with the repair strip.

5. Whether the specifications of the repair strip meet the strength requirements of the conveyor belt.