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Belt conveyor belt deviation automatic correction system


In order to solve the problem of running off during the belt conveyor, a drum correction roller and two symmetrical adjustable curved idlers are added behind the driving roller, and a spiral idler with adjustable dip Angle is applied in the middle of the belt. The limit offset vertical roll is arranged at the edge of the conveyor belt. The sensor is used to collect the corresponding conveyor belt deviation signal, and after processing by single chip microcomputer, the Angle of each adjustable idler is controlled to complete the conveyor belt correction.

1. Reasons for deviation of conveyor belt

(1) Quality defects of the conveyor belt itself, uneven distribution of tension on the section of the conveyor belt, bending moment effect on the center line of the conveyor belt, resulting in deviation.

(2) Deviation caused by material deviation. Due to improper position of the feeding port, the material is biased on the conveyor belt and causes deviation.

(3) Deviation of idlers causes deviation. During installation, the axis of idlers is not perpendicular to the center line of conveyor belt. During operation, lateral thrust perpendicular to the running direction of conveyor belt will cause deviation.

(4) The cleaning performance of the cleaner is not good, and the outer diameter of the drum or roller increases locally, causing deviation.

(5) Other reasons such as idler rotation is not flexible, frame vibration, wind load, sunshine caused by uneven temperature distribution caused by deviation.

2. Design of deviation adjustment device

(1) Design of adjustable idlers

As the main part of the belt conveyor, the roller bears the role of supporting, reducing the running resistance and ensuring the smooth running of the conveyor belt. In order to prevent the conveyor belt from running off in the conveying section, the adjustable idlers should be pre-adjusted 2 ~ 3° along the conveyor belt running direction. Under the action of friction force, the idlers on both sides will respectively provide centripetal resistance to the conveyor belt as they are at a certain Angle with the conveyor belt during work. The greater the deviation, the greater the middle side force. In order to increase the self-adjusting effect of the roller, the middle roller is made of double helix structure. If the conveyor belt deviation exceeds the roller pre-adjustment, the sensor will send the deviation signal to the MCU, which in turn adjusts the Angle of the side roller.

(2) Design of deflecting drum drum

When the belt conveyor starts and stops and the load changes, the length of the conveyor belt will extend or shorten accordingly, resulting in the deviation of the conveyor belt at the steering drum. The conveyor belt must work under the condition of ensuring the minimum initial tension, so that the tension ratio of the driving drum towards the entry point and the departure point should be fixed, and the ratio of the tension force to the rated working tension k=1.4 ~ 1.5. The fluctuation is about 10%, and k=0.9 ~ 11.1 in the normal working process. In order to reach or approach this value, a deflector drum is added above the return conveyor belt which is 1.5 ~ 2.0m away from the driving roller of the belt conveyor head, as shown in Figure 1. Under it, two curved idlers with adjustable pressure are symmetrically set. When the conveyor belt deviates, the MCU will judge the sensor signal. Adjust the Angle of the corresponding arc idler, increase the tension of the corresponding edge, and correct the conveyor belt.

3. Collection and processing of conveyor belt deviation signal

Conveyor belt deviation signal acquisition and processing system is composed of sensor, A/D converter, single chip microcomputer, executive circuit. When there is no deviation, the voltage is measured as a fixed voltage value. When there is deviation, the corresponding voltage is zero. The limit deviation signal is generated by the magnet connected to the vertical roller rotating in the coil, and the ratio and resistance of the transformer coil are selected according to the belt speed. When the limit deviation occurs, the voltage measured by the corresponding side sensor is restored to zero when the deviation disappears. The single chip microcomputer uses 8031 as the control machine, 2716 as the ROM, 74LS373 as the address latch, and the working block diagram of the system is shown in Figure 3. After the system is started, the MCU starts the collection program, and the sensor collects data. The data is converted into A digital quantity through A/D converter and input to the SCM. The SCM first determines which side is off track, and then sends an instruction signal to the stepper motor on the corresponding side to drive the change of the corresponding idler Angle. When the conveyor belt deviation is large, the conveyor belt drives the vertical roller to send out the rotation signal, and the single-chip microcomputer opens the limit deviation clock. If the conveyor belt cannot correct itself within the set time and resume normal operation, the single-chip microcomputer will issue shutdown instruction, the system will be powered off, and the power supply of the driving drum will be automatically cut off, and the conveyor belt will stop working. Perform manual maintenance. Conveyor belt deviation program block diagram is shown in Figure 2.

The conveyor belt deviation correction system realizes the dynamic management of conveyor belt deviation, reduces the fault incidence of belt conveyor, prolongs the service life of belt conveyor, and reduces the service and maintenance cost of belt conveyor.

Keywords: Jiuhuayang Mechanical Equipment

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