Method for correcting a deviation of a belt conveyor

Abstract

The application discloses a deviation rectifying method of a rubber belt conveyor and relates to the technical field of the rubber belt conveyor, and aims to solve the problems that in the current deviation rectifying method, the operation state of the equipment is not monitored and fed back in real time, and no redundancy protection is provided. Therefore, an improved scheme is provided. In the method, a timer is arranged, and an encoder is arranged on a screw rod for controlling a regulating wheel; the rotating range of the regulating wheel is limited through the limit position of the encoder, and whether the rubber belt is reset is judged through continuous detection of the deviation condition, and the redundancy protection of the timer is added.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of belt conveyors, and particularly relates to a deviation rectification method of a belt conveyor. BACKGROUND

[0002] Belt conveyors are commonly used in mine fields and the like. During the operation of the belt conveyor, the center line of the belt deviates from the center line of the conveyor, that is, the belt moves to one side, which is referred to as belt deviation. Deviation is one of the common fault phenomena of the belt conveyor, and the root cause is that the tension distribution on the contact surface between the belt and the roller is uneven, causing the belt to deviate left and right on the roller and unable to run in the center. Long-time deviation operation not only causes serious wear of the edge of the belt, but also causes sudden accidents such as belt tearing and scraping. Therefore, the belt deviation condition needs to be detected, and once the deviation occurs, it needs to be handled as soon as possible.

[0003] However, in the current deviation rectification scheme, the trigger adjustment mechanism is usually single, there is no real-time monitoring and feedback on the running state of the equipment, and there is no redundancy protection, so an improved scheme is proposed. SUMMARY

[0004] The present application provides a deviation rectification method of a belt conveyor, a timer is arranged, and an encoder is arranged on a lead screw for controlling a regulating wheel; the following steps are executed:

[0005] S1, detecting whether the belt deviates by a deviation detection device, if yes, generating a deviation signal, and if no, repeatedly executing step S1;

[0006] S2, based on the deviation signal, the frequency converter is controlled to rotate forward to control the rotation of the carrier roller to correct the deviation of the belt;

[0007] S3, judging whether the encoder exceeds the limit position, if yes, sequentially executing step S6 and step S5, and if no, executing step S4;

[0008] S4, judging whether the timer is overdue, if yes, sequentially executing steps S6-S8, and if no, executing step S5;

[0009] S5, detecting by the deviation detection device whether the deviation signal disappears, if yes, sequentially executing steps S6-S8, and if no, executing step S3;

[0010] S6, stopping the frequency converter;

[0011] S7, reversing the frequency converter;

[0012] S8, detecting whether the encoder is at the zero position, if yes, the deviation rectification is completed, and if no, repeatedly executing step S7.

[0013] The application further provides that a dead zone is set for the detection range of the deviation detection device in the step S1 and the step S5, and the deviation signal is generated when the deviation of the rubber belt exceeds the dead zone range.

[0014] The application further provides that after the step S6 is executed, the frequency converter is delayed for a predetermined time, and then the step S7 is executed.

[0015] The application has the following advantages:

[0016] The real-time detection mechanism of the deviation detection device and the encoder in cooperation with each other, that is, the rotation range of the adjusting wheel is limited, and the deviation is continuously detected within the established range, can make the correction effect better. By the intervention of the timer, the rotation time of the adjusting wheel is measured, and the damage of the equipment caused by the damage of the encoder can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a flow chart of the method in the application. DETAILED DESCRIPTION

[0018] The preferred embodiments of the application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the application, and are not intended to limit the protection scope of the application.

[0019] The application provides a deviation correction method of a rubber belt conveyor. The method is based on the existing deviation correction equipment, for example, the full-automatic belt adjusting wheel set disclosed in the patent with the publication number CN201109625Y. The adjusting wheel can adjust the included angle between the adjusting wheel and the rubber belt through a lead screw. Since the adjusting wheel rotates and contacts the rubber belt, after the adjusting wheel rotates by a certain angle in the horizontal plane, a lateral driving force to the left or right of the rubber belt of the conveyor is generated, and the position of the rubber belt is adjusted to correct the deviation by relying on the driving force. Hereinafter, the rotation of the adjusting wheel refers to the change of the included angle between the adjusting wheel and the rubber belt.

[0020] The method sets a timer and an encoder on the lead screw for controlling the adjusting wheel; and the following steps are executed:

[0021] S1, detecting whether the rubber belt deviates by the deviation detection device, if yes, generating a deviation signal, and if not, repeatedly executing the step S1;

[0022] S2, based on the deviation signal, the frequency converter is controlled to rotate in the forward direction to control the rotation of the carrier roller to correct the deviation of the rubber belt;

[0023] S3, judging whether the encoder exceeds the limit position, if yes, sequentially executing the step S6 and the step S5, and if not, executing the step S4;

[0024] S4, judge whether the timer is expired, if yes, sequentially execute steps S6-S8, if no, execute step S5;

[0025] S5, detect by the deviation detection device, judge whether the deviation signal disappears, if yes, sequentially execute steps S6-S8, if no, execute step S3;

[0026] S6, the frequency converter stops;

[0027] S7, the frequency converter reverses;

[0028] S8, detect whether the encoder is at zero position, if yes, deviation correction is completed, if no, repeat step S7.

[0029] The deviation detection of the adhesive tape can be realized based on the video acquisition technology and the deviation switch detection technology in the prior art, and the two can also be used simultaneously.

[0030] During the continuous operation of the conveyor, the deviation detection device constantly monitors the operation of the adhesive tape according to the set frequency, and if deviation is found, a deviation signal is generated and sent to the PLC, which controls the rotation of the lead screw through the frequency converter to drive the adjusting wheel to rotate, and the encoder measures the rotation of the lead screw during the rotation; if not, it continues to monitor and detect. The detection range of the deviation detection device also needs to set a dead zone, because the vibration or other factors during the operation of the conveyor will affect the operation of the adhesive tape, but small deviations can be accepted. If no dead zone is set, the deviation correction device will not stop working, but it has little practical significance, and it will waste energy and affect the service life of the equipment. Therefore, any detection of the deviation of the adhesive tape in this paper refers to the deviation beyond the dead zone range.

[0031] In step S2, the forward rotation of the frequency converter refers to the rotation direction for correcting the adhesive tape, that is, if the adhesive tape deviates to the left, the forward rotation direction of the frequency converter is to drive the adjusting wheel to rotate clockwise; if the adhesive tape deviates to the right, the forward rotation direction of the frequency converter is to drive the adjusting wheel to rotate counterclockwise.

[0032] However, the rotation amplitude of the adjusting wheel needs to be controlled within a certain range, and the range of ±40° is preferred, and the angle of rotation of the adjusting wheel is obtained by measuring the rotation of the lead screw by the encoder, that is, because the adjusting wheel has the maximum rotation amplitude, the encoder is set to the limit position of rotation.

[0033] The timer is a redundant protection design for the whole rectification device. The rotation range of the adjusting wheel is known, so the time for the adjusting wheel to rotate to the limit position can be calculated. If the encoder is damaged and the limit position cannot be determined, the continuous rotation of the adjusting wheel will cause derailment or jamming (i.e. the motor driving the lead screw is stalled), which will harm the overall operation of the device, so the timer needs to be involved. Once the time limit is reached, the frequency converter is stopped immediately.

[0034] The whole process is illustrated by examples as follows:

[0035] If the adhesive tape appears to be offset to the left, the deviation detection device detects it and generates a deviation signal and sends it to the PLC. In response to the deviation signal, the PLC drives the lead screw to rotate by controlling the frequency converter, and then drives the adjusting wheel to rotate clockwise, generating a driving force that moves the adhesive tape to the right.

[0036] During the rotation of the adjusting wheel, the limit position of the deviation device is continuously detected. In the early stage of rectification, the encoder will not reach the limit position, so after determining the limit position of the frequency converter, the timer determines whether the time limit is exceeded. If not, it is determined whether the deviation signal disappears. In the early stage of rectification, the adhesive tape cannot return to its original position, so the deviation signal cannot disappear, and the process returns to step S3 to determine the limit position of the frequency converter. This process is repeated. If the deviation signal disappears, steps S6 and S7 are executed.

[0037] However, when the frequency converter exceeds the limit position, step S6 is executed to stop the frequency converter, i.e. the adjusting wheel no longer rotates horizontally, and then it is determined whether the deviation signal disappears. If yes, it means that the adhesive tape has returned to its original position, and steps S6 and S7 are executed. If not, the process returns to step S3, but since the encoder has reached the limit position, the process is repeated. Although the adjusting wheel no longer rotates, the rotation of the adjusting wheel itself continues to correct the adhesive tape until the adhesive tape returns to its original position and the deviation signal disappears, and the process is exited.

[0038] However, if the frequency converter fails to determine the limit position, i.e. the output of step S4 is always "no", the timer is involved to determine. If the deviation signal disappears, steps S6 and S7 are executed. If not, the process returns to step S3 and continues to cycle. If the condition is met, steps S6 and S7 are executed immediately to avoid harming the operation of the device.

[0039] During the execution of steps S6 and S7, after step S6 is executed, the frequency converter is delayed for a predetermined time before step S7 is executed. The purpose is to filter the signal to prevent signal jitter from causing false operation.

[0040] The inverter reverses in order to reset the adjusting wheel. After resetting, the encoder returns to the zero point. Therefore, after step S7 is executed, step S8 is executed to determine whether the encoder is at the zero point. If not, step S7 is continuously executed. If yes, the correction is completed, and the entire process is executed. The process returns to S1 to perform the next workflow.

[0041] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without deviating from the principles of the present application, and the technical solutions after these changes or replacements will all fall within the protection scope of the present application.

Claims

1. A deviation correction method of a belt conveyor, characterized in that: a timer is set and an encoder is set on a screw rod controlling a correction wheel; the following steps are executed: S1, a deviation detection device detects whether the belt deviates, if yes, a deviation signal is generated, if not, step S1 is repeated; S2, based on the deviation signal, a frequency converter is positively rotated, and a carrier roller is controlled to rotate to correct the belt deviation; S3, whether the encoder exceeds a limit position is judged, if yes, step S6 and step S5 are executed in sequence, if not, step S4 is executed; S4, whether the timer is overdue is judged, if yes, steps S6-S8 are executed in sequence, if not, step S5 is executed; S5, the deviation detection device detects whether the deviation signal disappears, if yes, steps S6-S8 are executed in sequence, if not, step S3 is executed; S6, the frequency converter is stopped; S7, the frequency converter is reversely rotated; S8, whether the encoder is at a zero position is detected, if yes, the deviation correction is completed, if not, step S7 is repeated. In the step S1 and the step S5, a dead zone is set for the detection range of the deviation detection device, and the deviation signal is generated only when the belt deviation exceeds the dead zone range. After the step S6 is executed, the frequency converter is delayed for a predetermined time, and then the step S7 is executed. ​ ​ ​ ​ ​ ​ ​ ​ 2. The deviation correction method of a belt conveyor according to claim 1, characterized in that: ​ 3. The method of correcting deviation of a belt conveyor according to claim 1, characterized in that: ​

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