1. Hopper belt slipping (1) Bucket elevator is to use the friction torque between the hopper belt and the head wheel drive shaft to lift the material. The tension of the hopper belt is not enough, which will cause the hopper belt to slip. At this time, stop immediately and adjust the tensioning device to tighten the hopper belt. If the tensioning device does not fully tension the hopper belt, the stroke of the tensioning device is too short and should be readjusted.
The correct solution is to untie the hopper with the joint, adjust the tensioning device on the bottom wheel to the highest position, put the hopper belt into the hoist head, pass the head wheel and the bottom wheel, and connect the head and tail to make the hopper The belt is in a state where it will be tensioned and not tensioned. The tensioning device is then fully tensioned. At this time, the tensioning stroke of the adjusting screw of the tensioning device that has not been utilized should not be less than 50% of the full stroke.
(2) When the hoist overload hoist is overloaded, the resistance torque increases, causing the hopper belt to slip. At this point, the amount of material to be fed should be reduced and the feeding should be uniform. If the amount of feed is reduced, the slippage cannot be improved. It may be that the material in the machine is too much or the hopper is stuck by the instructor. The machine should be stopped for inspection and the fault should be eliminated.
(3) The inner surface of the head wheel drive shaft and the hopper belt is too smooth. The inner surface of the head wheel drive shaft and the hopper belt is too smooth, so that the friction between the two is reduced, resulting in the hopper belt slipping. At this time, a layer of glue can be applied to the inner surface of the drive shaft and the hopper belt to increase the friction.
(4) The rotation of the head and bottom wheel bearings is not working. The rotation of the head and bottom wheel bearings is not working, and the resistance torque is increased, causing the hopper belt to slip. At this time, it is possible to remove and wash the oil or replace the bearing.
2. Hopper belt deviation (1) Head wheel and bottom wheel drive shaft installation Misalignment of the head wheel and bottom wheel drive shaft are mainly reflected in the following aspects: First, the drive shafts of the head and bottom wheels are in the same vertical plane. And not parallel; second, the two transmission shafts are installed in a horizontal position and not in the same vertical plane; third, the two transmission shafts are parallel, in the same vertical plane and not horizontal. At this time, the hopper belt is deflected, which easily causes the impact of the hopper and the barrel, and the tear of the hopper belt. Stop immediately and troubleshoot. The drive shafts of the head wheel and the bottom wheel are installed in the same vertical plane, and both are in the horizontal position. The vertical deviation of the center line of the whole machine at 1000 mm height does not exceed 2 mm, and the accumulated deviation does not exceed 8 mm.
(2) The hopper with the joint is not the hopper with the joint is not exactly after the hopper belt is combined, the hopper belt edge line is not on the same line. During work, the hopper belt is tight on one side, so that the hopper belt moves to the side of the tight side, causing deviation, resulting in insufficient hopper feeding, incomplete discharge, increased returning, decreased productivity, and severely causing the hopper to be jammed. Tear. At this time, stop the machine, correct the joint and connect it.
3. Excessive material return The hoist return material refers to the phenomenon that the material is not completely discharged from the machine at the unloading position, and some materials are returned to the hoist base. In the lifting operation, if the hoist returns too much, it will inevitably reduce the production efficiency and increase the power consumption and the breaking rate of the material. The reasons for the large amount of material return are as follows: (1) The speed of the hopper is too fast. The hoist lifts different materials. The speed of the hopper operation is different: when the dry powder and pellets are generally raised, the speed is about 1~2m. /s; When lifting bulk materials, the speed is 0.4~0.6m/s; when lifting wet powder and pellets, the speed is 0.6~0.8m/s. The speed is too large, and the unloading is advanced, causing the return. At this time, the speed of the hopper should be appropriately reduced according to the material to be lifted to avoid returning.
(2) The unloading tongue plate at the exit of the machine head is not properly installed, and the tongue plate is too far away from the discharge position of the hopper, which will cause the material to be returned. The position of the tongue should be adjusted in time to avoid returning.
4. Hopper detachment Hopper detachment refers to the phenomenon that the hopper falls from the hopper belt during production. When the hopper falls, an abnormal sound will be generated, and it is necessary to stop the inspection in time. Otherwise, more hoppers will be deformed and fall off; the hopper belt will be torn at the position where the hopper is connected. The main reasons for the hopper falling off are: (1) too much feeding material, resulting in accumulation of materials in the machine base, increased lifting resistance, and poor hopper operation, which is the direct cause of hopper falling off and deformation. At this point, stop immediately, pull out the board under the base, discharge the accumulation in the base, replace the new hopper, and then drive production. At this time, the amount of feed is reduced and uniformity is sought.
(2) The position of the feed port is too low. Generally, when the hoist is in production, the hopper itself takes the material coming in from the feed port. If the position of the feed port is too low, the hopper will not be able to take the material, and most of the material will enter the machine base, causing the hopper to pick up the material. When the material is in the form of a block, it is easy to cause the hopper to deform and fall off. At this time, the feed port position should be adjusted above the center line of the bottom wheel.
(3) When the machine is turned on, the accumulated contents in the machine base are not in the production process. It often encounters a sudden power failure or other reasons and stops. If the machine is not turned on, it will easily cause the hopper to be affected. The impact is too large and breaks off. Therefore, between the shutdown and start-up, the accumulation physics in the base must be removed to prevent the hopper from falling off. In addition, regularly check whether the connection between the hopper and the hopper belt is firm. If the screw is loose, falling off, and the hopper is skewed or damaged, it should be repaired or replaced in time to prevent a larger accident.
5. Hopper belt tearing The hopper belt is usually a canvas belt, sometimes with tape and chain. Under the combined effect of various faults, the canvas belt and the tape are prone to tearing, which is one of the most serious failures. Generally, the hopper belt deviation and the hopper falling off process are most likely to cause the hopper to tear. The cause should be checked in a timely and comprehensive manner to eliminate the fault. In addition, the inclusion of sharp-edged foreign matter in the material will also crack the hopper belt. Therefore, in production, steel wire mesh or magnetite should be installed at the feed port to prevent large foreign objects from falling into the machine base.
Common faults of bucket elevators and correct handling methods
The following are some common faults during the use of this device: