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Large dip Angle conveyor anticorrosive coating requirements

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Update time : 2023-02-08 09:27:18
Large dip Angle belt machine coating requirements for anti-corrosion coating suitable for cold climate environment, winter should meet the requirements of cold and anti-freezing.
1. Surface treatment requirements
1) The surface of the steel structure of the belt conveyor shall be sandblasted to meet the national standard Sa2.5 level, remove dust, remove oil stains with cleaning agent, keep the bottom surface clean and dry, and then spray anti-rust paint. (The abrasive used is dry quartz sand with a particle size of 0.3 ~ 1.5mm).
2) Welding slag, powder coating, arc dust, residual edge and burr from mechanical processing are not allowed on the surface of welded structural parts.
3) Casting, forging surface uneven or other surface concealer caused by sandblasting to try to smooth, fill or appropriate treatment.
4) The surface of the coating to be recoated should be kept clean, dry and free of any dirt.
5) Where the processing or welding primer is damaged, it should be repainted after the primer, and then the matching medium coat or top coat.
2. Large dip Angle belt machine anticorrosive coating requirements
1.1 Paint film thickness:
Primer: epoxy zinc-rich primer, airless spray, 50μm, recoating interval 2h;
Medium coating: epoxy cloud iron antirust paint, airless spray, 100μm, recoating interval of 10h;
Top coat: acrylic rubber top coat, airless spray, 50μm, recoating interval 4h.
1.2 Requirements:
1) The interval between the metal surface after rust removal and the primer is generally no more than 6h. If rust has been rusted before painting, it should be cleaned or cleaned again.
2) Local airless spraying can not be used, brush coating can be used, brush coating (can be multiple times) film thickness must reach the specified film thickness.
3: corrosion prevention standards
1) The anticorrosion grade of the anticorrosion system shall be above medium, and the thickness of the dry film of the coating shall reach the thickness specified in this Agreement.
2) Preservative life: 5 ~ 8 years.
4: Acceptance standard
1) After surface treatment, the steel surface is almost white, no visible grease, dirt, oxide skin, rust and other sundries.
2) After coating epoxy zinc-rich primer, the standard film thickness is 50μm, the film adhesion is good, no leakage coating, pinhole, bubble, crack, fall off, flow hanging and other defects, the surface is kept dry and clean.
3) After coating the epoxy cloud iron anti-rust paint, the standard film thickness is 100μm, the adhesion between the coatings is good, no leakage coating, pinhole, bubble, crack, fall off, flow hanging and other defects, the surface is kept dry and clean.
4) After coating acrylic top paint, reach the standard film thickness: indoor 100μm, outdoor 200μm, good adhesion between coatings, no color infiltration phenomenon, no bubbles on the surface, flow hanging and other defects, the surface has a certain luster.
5. Detection method
1) Testing instrument: electromagnetic dry film thickness measuring instrument.
2) Detection method: The electromagnetic dry film thickness measuring instrument is used to measure one point every 10m2 and one point every 3 ~ 4m of thin bodies such as pipes. The three-point average is the actual film thickness of the coating, and the three-point error should be less than 20% of the specified standard film thickness.
3) Appearance detection: the appearance of the coating can be observed with the naked eye or a five-fold magnifying glass.
4) The film thickness mentioned above is dry film thickness.
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2, coating and coating deformation.
3. The allowable strength utilization rate of the conveyor belt (that is,  the percentage of the maximum tension of the conveyor belt to the allowable tension of the conveyor belt).
4. The bending frequency of the conveyor belt (related to the winding method, the number of rollers bypassed,  the distance and the speed).
5, the installation site and service conditions of the conveyor (such as: ground, underground, open air, mobile, fixed, etc.)
6. Bending stress of conveyor belt when it bypasses the drum.
The above method is the belt conveyor drum diameter selection method.
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First, belt conveyor roller serious eccentric noise
Abnormal noise and periodic vibration often occur to idlers during the operation of belt conveyors. Especially the return roller, because of its large length, since the weight, noise is relatively large. Noise has two main causes.
1. The wall thickness of the seamless steel pipe used for manufacturing idlers is uneven, resulting in greater centrifugal force. 2. When machining, the deviation between the center of the bearing holes at both ends and the center of the outer circle is large, so that the centrifugal force is too large.
Solution: It can continue to be used under the condition that the bearing is not damaged and noise is allowed.
Two, belt conveyor coupling two axes of different centers of noise
Abnormal noise from the coupling between the motor at the high speed end of the drive and the reducer or the coupling with the brake wheel, This noise is also accompanied by vibrations at the same frequency as the motor turns.
Solution: The position of the motor reducer should be adjusted in time to avoid the fracture of the input shaft of the reducer. 3. Abnormal noise of belt conveyor reversing drum and driving drum
The noise is very small when the reversing cylinder and the driving cylinder work normally. When the abnormal noise occurs, the bearing is generally damaged and the bearing seat makes a rattling sound.
Solution: Replace the bearing.
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Specification type: The strong belt conveyor in our coal system use a lot, especially in recent ten years develop very fast. At present, although the strong belt conveyor is not shaped products, but the product series has been standardized.
At present, the strong belt conveyor produced in our country has 7 kinds of bandwidths, 5 kinds of belt speeds and 10 kinds of belt strength, which can form 51 kinds of different specifications of products to choose.
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(1) The conveyor belt of the general belt conveyor uses canvas, polyester, nylon and other fibers as the core layer of the conveyor belt; The conveyor belt of the strong belt conveyor is made of many fine steel ropes as the core layer material.
(2) Due to the limitation of the strength of the conveyor belt, the current maximum length of the general belt conveyor is generally l000 m; The conveyor belt of the strong belt conveyor adopts the silk rope as the core layer, greatly improving the strength of the conveyor belt, and the transport distance can reach 15,000 m.
(3) the general belt conveyor has shaped products, users only need to choose according to the conditions of use; Strong belt conveyor has not been finalized design products, the user needs to put forward conditions, to choose standardized design products.
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1, increase the transmission Angle (30~90 degrees);
2, small area, less investment;
3, large throughput, higher lifting height;
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