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Types of rubber packing for belt conveyor rollers and precautions
Published: 2015-4-10 11:06:18 Source: Conveyor http://shxierui.com Author: Hai Yu sound machine
After the belt conveyor roller is coated, the friction between the roller and the belt can be increased, so as to improve the conveyor transportation efficiency, realize safe and reliable operation, reduce belt wear and elongation, extend the service life, and adapt to humidity and harshness. surroundings. After the metal drum is coated, the friction coefficient between the drum and the belt is increased, the stress on the belt is correspondingly reduced, and the belt elongation factor is limited. Due to the improvement of transportation efficiency, the indirect energy saving effect is obviously increased.
There are many types of rubber coating for belt conveyor drums, mainly including: cast rubber, cold viscose, tile shell rubber coating, ceramic rubber coating, etc. Each of these rubber coating methods has its own characteristics.
With the casting method, the contact surface between the rubber surface of the roller and the roller is large, there is no gap, and the rubber coating is firm and reliable. But its disadvantages are:
(1) Thread-shaped grooves must be machined on the entire surface of the cylinder before casting, in order to increase the contact area and increase the adhesive strength;
(2) Since the thickness of the casting compound is not uniform after casting, secondary processing is required to ensure the coaxiality of the outer circle of the drum and the drum shaft, which requires higher equipment;
(3) Once the rubber surface is peeled from the tube skin during use, it is difficult to repair, the roller must be removed, the car must be outsourced, and the rubber must be repackaged.
The advantages of cold viscose are that it is relatively simple to produce compared to cast rubber, and the rubber is evenly packaged without the need for large equipment. The disadvantages of cold glue are:
(1) When sticking glue, the roller is required to be smooth and clean, and there is no oil stain, so the surface of the roller must be cleaned first;
(2) When sticking glue, there must be no gap between the rubber sheet and the surface of the roller, otherwise the strength of the glue will be affected and the rubber sheet will easily crack;
(3) Once the rubber sheet is disengaged after use, it is not easy to repair. You must remove the roller to peel off the rubber sheet, clean it again, and re-adhere the rubber sheet.
In addition, there is a more advanced ceramic drum coating, which is a 20mmx20mm inlay of special rubber, alumina with ceramic particles on the surface and excellent wear resistance. Because the ceramic and rubber vulcanized contact surface has a unique dovetail groove structure, the ceramic and rubber are closely adhered together to ensure that the ceramic will not come out of the rubber. The surface of the ceramic sheet has bumps and high roughness, which can increase the friction coefficient of the surface of the roller, making the continuous operation of the conveyor belt difficult to slip. The ceramic lining board is firmly bonded without layer, has excellent wear resistance, long service life, and is 3 to 5 times longer than ordinary rubber coating, eliminating the trouble of multiple rubber coating repairs.
Preparations and precautions before encapsulation:
In addition to decontaminating the metal roller in advance, the rubber sheet must also be prepared while applying the first layer of glue, that is, cut to the required shape and size.
When the drum is covered with rubber, a square ruler should be placed on the side of the drum, and a horizontal line should be drawn along the entire width of the drum (you cannot use oil pen to draw lines). Place the rubber plate with the logo on the roller with the logo line, the two lines are aligned, the rubber plate exceeds 10 ~ 15mm at both ends of the roller, and immediately press the rubber plate obliquely. When using the West German TR70 non-slip rubber sheet, the groove forming process must be done. The rotation direction of the drum must be considered, and the overlap joint should be opposite to the rotation direction. After preparing according to this procedure, immediately apply the second layer of "mixture" to the hypotenuse of the rubber sheet, and roll the entire non-slip rubber layer around the entire roller from the middle to the outside. When rolling, squeeze out air bubbles and do not stretch the rubber sheet. long. Then use a rolling roller to roll the entire rubber layer from the middle to the outside, and hit the joint with a rubber hammer. The roller should be allowed to stand for 3h before cutting off the rubber that is beyond the ends of the roller. When using the West German CN metal adhesive, it can be shortened by 2h. At this time, the rubber beyond the two ends of the drum can be beveled (beveled at an angle of 45 ° with the centerline of the drum), so that the outer layer of the drum is roughly circular, and smoothed with an angle grinder in the direction of the joint (cannot be reversed). Mark the middle of the drum of the cladding, draw a center line around the drum with a tape measure, put a square on the side of the drum, and draw a horizontal line along the axis of the drum. At the intersection of the two lines, mark points A and B with 1/2 of the length of the roller. With the arrow pointing in the direction of rotation, draw two corrugated lines from B to C1 and C2, spaced 50mm, and then use the corrugations. The machine cuts the grooves at the overlap, as shown in the figure.
The use of this cold-packing technology can significantly increase the rotational friction between the drum and the belt, so that the belt conveyor can run safely and smoothly, especially under load or in a humid environment, which is beneficial to the wear resistance of the belt and its The service life is extended, which can effectively improve efficiency and save electricity. Especially when the belt is under load, the belt will not run under pressure and only drive the drum to prevent friction and fire.
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