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The first part of the conveyor belt installation and commissioning

Provider:   Source:   Time:2019-08-07  

(1) Handling of conveyor belts

The factory's packaging is used to protect the conveyor belt during the handling of the ship and ship under normal conditions. When the belt is shipped, it must be carefully unloaded. It cannot be thrown down from the truck and transported wildly.
The best way to move the belt is to use a crane. When lifting, use a strong shaft to pass through the center of the coil, and then use a steel cable sling with a beam to hoist smoothly to prevent the steel cable from damaging the edge of the belt. Figure:

When unloading the vehicle, it should be freely and smoothly placed on the ground. Do not tilt it to the ground and open it at will.
Try not to roll the tape. If necessary, you must roll in the direction of the tape take-up. Do not roll in the opposite direction to cause the tape to be loose, and the sleeve is out of the tube. It is difficult to clean up and bring difficulties to the next step.
It is also possible to place the tape roll flat on the positioning plate and lift it with a forklift, but make sure that the fork of the forklift does not come into contact with the belt itself, so that the belt is safe.

(2) Storage of conveyor belt
There are many situations, such as when building a large project or preparing to repair and replace the tape. The conveyor belt may be stored for months or even years, which requires consideration of a good storage condition to avoid the influence of various unfavorable factors.
The tape should be stored in a dry, dark place. The ideal storage temperature is 10~C to 20°C. Avoid lower than
5 ° C (especially Pv belt). If it must be stored in the open air, use a rain-proof cloth or similar covering to cover the conveyor belt. It should not be exposed to direct sunlight. It should not be stored in a place that is too wet or stored in oil, gasoline, paint or acid. Where chemicals and chemicals are not in contact with or near ozone.
It is best to place the pad when storing and plug it securely to prevent accidental rolling. Can not be placed vertically, because the vertical position may cause skew, if long-term storage, it should be rotated regularly to prevent the internal pressure from continuously acting on the same point.
(3) Preparation before installation
The conveyor belt must be inspected prior to installation to determine if the conveyor belt is ready for use. At the same time, the conveyor must be checked as follows:
1. Whether the frame is tight, flat, straight and straight. Whether the parts fixed to the rack are “horizontal and vertical”, if it is skewed, it must be corrected, the diagonal is measured along the rack, and the diagonal lines are equal.
2, all rollers and rollers must be at right angles to the transmission direction of the conveyor belt, and parallel to each other, rotating from
For example, there are no damage, oil and scale.
3. Cleanliness is the basic condition for the belt to run well. The accumulation of any material on the roller and the idler can easily damage the verticality of the roller and the idler. The foreign material will form a new roller and the pulley surface, causing the belt to be eccentric. , produces a difference in warp tension, affecting the correct operation of the belt.
4. Remove the scraper, rubber skirt and hopper, or transport these things a little to avoid obstructing the installation of the conveyor belt. The rubber on the skirt, hopper and scraper needs to be inspected.
5. The screw tensioning device is adjusted to the shortest center distance position. The conveyor of the gravity tensioning device should check the overhanging part and the movable part. The roller must be kept at right angles to the running direction of the belt, and then the gravity is tensioned. The device is fixed at the highest position.
(4) Installation of conveyor belt
1. After the coil reaches the installation site, put the mandrel on the creel to facilitate unwinding and threading onto the conveyor.
2. When positioning the tape before threading, pay attention to the relative position of the upper and lower cover rubber surfaces. If the glue is facing upwards, the tape should be pulled to the return roller for guiding.
3. In some occasions, the space lifting frame is not allowed to use the tape roll. When the tape roll is opened and folded together, care should be taken to make the folded tape bend enough to avoid crease or cause undue deformation of the tape. Never put heavy objects on the belt
4. Pull the conveyor belt onto the conveyor with a rope and pulley. If it is a replacement belt, the old belt can be removed and the new belt can be installed at the same time. When the old belt is cut off, the horizontal conveyor can be carried out at any point. If it is a tilting conveyor, the selection of the cutting point should be taken to prevent the conveyor belt from falling due to its own weight.
5. Connect the new belt to the old belt by mechanical means or other methods, and install the other end of the old belt on the tractor (truck, tractor, winch), and pull the old belt out while starting the machine. The belt is pulled into the corresponding position of the conveyor to ensure that the tape does not excessively twist and bend.
6. The installation of the new conveyor tape, after the position of the tape on the conveyor is positive, use the traction clamp to clamp the end of the tape, and connect the cable around the roller and the roller to drag the traction tape as smoothly as possible. On the conveyor. The edges of the tape must not be crushed against the frame to prevent the tape from folding, and the tape should be placed as flat as possible on the rollers and rollers before the connectors and tensioning tape.
7. When connecting the tape, first fix the tape on the conveyor with a clamp to avoid unnecessary damage to the tape. Use a winch or similar device to tighten the other end to the side. The degree of tension should be taped. Sufficient tensioning stroke, the tape between the two return rollers is not significantly sagging.
(5) Commissioning of the conveyor belt
The conveyor belt is commissioned after installation and joints. In a sense, the test run is a process of adjusting the idler rolls, rollers and loading conditions to correct the tendency of the belt to be unbalanced. The basic principle of conveyor belt operation must be remembered: the belt moves towards the end of the roller/coil that is first contacted. The factors that affect the operation of the belt are:
1. Various rolls: A relatively small control effect can be obtained from the middle height of the conveyor rolls. The mid-height is the most effective when the belt is long span and unsupported (about 3M) close to the pulley. Extending the unsupported span of more than 3 meters does not seem to increase the effect of the height in the roll. On the other hand, reducing the length of the unsupported span reduces the effect of the height in the roll.
All rollers should be horizontal, 90 degrees from the center axis of the predetermined tape path, and cannot be used as a means of commissioning, but there are exceptions. The buffer roller can be changed when the correction provided by other commissioning methods is insufficient. Axis.
2. Carrying roller: The grooved roller acts like a parallel roller, the tape moves toward the roller end that is in contact with the first contact, and the grooved roller applies a large gravity guiding force. Because it is a trough structure, the edge of the belt is supported at the bend, and gravity is applied to the upper portion of the belt. If the belt is not in the center of the grooved roller, the gravity on one side is greater than the other, which helps the belt to be centered. Adjusting the belt with a grooved roller is generally called a "strike roller" and is effective when the entire belt runs along one side of the conveyor along one side, as shown in Figure (a). Moving the idler in this manner should extend a certain length in front of the conveyor trouble zone, generally having the largest positive adjustment effect in the region of approximately 4.5-7.5M, but at the expense of increased rolling friction between the belt and the idler, The path is vertical and only a minimum number of roller movements are used as an adjustment. If the belt is over-adjusted with the moving roller, the same roller should be moved backwards to restore the belt, and do not move more rollers in other directions. Obviously, this roller movement is only effective in one direction of operation, such as the belt returning, which is unfavorable in the other direction. Another way to adjust the belt run with a grooved idler is to tilt the groove to a forward direction (not more than 2 degrees) in the running direction of the belt, creating a self-centering effect. The method is to put the gasket on the back leg of the roller frame as shown in Figure (b). The advantage of this method is that the movement of the belt can be corrected for both sides of the idler and thus practical for adjusting the unstable belt.
3. Return roller: The return roller is flat, and does not provide self-centering in the case of a chute roller. However, moving their axis strikes, the return roller can be used to provide a constant correction effect in one direction relative to the path of the strap.
When the strap accepts the trailing roller, the alternate end of the return roller that is slightly forward and raised closest to the trailing roller will further aid the centering of the strap as shown in Figure (c).

4, the strap itself: a newly installed strap, if there is no moderate contact with the center of the carrying roller, or the belt has a curvature in the length direction, the correct operation of the strap will be difficult. Therefore, to implement the groove design
To avoid this trouble, choose the right strap. The suitability of the groove forming ability is shown in (a)(b)(c):
The belt has a curvature, which is a manifestation of internal warp tension imbalance. When placed horizontally, it is usually in the form of “crescent” or “banana”. If the bending of the belt is not more than 0.5%, it can be stretched when properly tensioned. normal.

5, conveyor belt test procedure
1. Confirm all the rollers before the test, and set the rollers. It is good to return to the roller centering. Horizontal installation and center
In a straight line.
II. Confirm that all tools and other items on both sides of the conveyor belt have been removed.
III. Pre-tension the tape to maintain the proper starting tension of the conveyor belt
IV. First test the air run, and carefully adjust it at the same time. It should be realized that the correction of the deviation of the tape cannot be performed by bumping, and it must be carried out in a well-organized manner.
V. Starting to move the belt should be slow and intermittent so that any tendency of the belt to be deflected can be quickly observed, and the belt is stopped in time before the damage occurs.
VI. When the conveyor is installed in a long center, personnel should be observed every other period and provide them with effective communication methods to report their observations in time or stop the belt in time.
VII. The initial movement of the belt will provide an indication of the type and position to be corrected. The first position to be corrected must be where the belt is at risk of damage. Once all the dangerous points of the belt have been removed, a series of adjustments can be performed.
VIII. The best sequence for commissioning is to first adjust the running of the return side towards the tail roller and then adjust the upper side (conveying surface) in the direction of the belt running. The following steps can be taken
1. Movement from the idler to the idler in the running direction of the belt:
2. Move only one roller at a time (moving successive rollers may cause overcorrection):
3. Make minor adjustments instead of extreme adjustments
4. Wait at least three turns before making the next adjustment;
5. Try not to adjust the roller. The roller should be kept perpendicular to the belt and only change if all the adjustment methods are invalid.
6. The adjustment work of the upper side (conveying surface) should be adjusted from the tail roller to the head. The automatic adjustment of the roller can prevent the deviation of the tape. Generally, the best position of the roller is adjusted to be close to the roller. Tube and 10-15 meters from the roller
The place. If the empty belt is easy to run in the upper part, the running tendency is not unstable.
IX. Tension has a strong influence on the operation of the belt at that point. Because it moves with the length of the belt, causing a poor centering, it must be guided during its operation to keep the belt roller shaft level.
X. No-load belt debugging is satisfactory, start loading and debugging, the load should be gradually ramped up until full load. The ideal condition is that the material passes through the chute to the belt almost at the same speed and running direction with an error of 1.5-3 meters per minute, so that the impact of the belt is minimal. Misalignment during loading is usually due to off-center loading or accumulation of material on the buffer rolls and return rolls. Therefore, it should be adjusted again, improve the initial adjustment, and compensate for the non-central load. Here, comprehensive consideration is needed. The correction of the deviation should be as small as possible at no load and full load. The “running” and “series” of the conveyor belt (alternating deviations) are preferably zero, but this is difficult to achieve. According to the German industrial standards D|N22102-1991 and 22131-1988, the allowable deviation of the fabric core conveyor belt and the wire rope conveyor belt is
Conveying bandwidth m
≤800 ±40
>800-1400 ±5%
1600-3200 ± 7.5
The correct operation of the tape should be studied from a system perspective. It may happen that the belt has a problem, but more is only a reaction to the structural problem or the system is not coordinated. The conveyor belt is just an indicator.