CN-121990333-A - Self-adaptive variable-frequency flapping cleaning system and control method

CN121990333ACN 121990333 ACN121990333 ACN 121990333ACN-121990333-A

Abstract

The invention relates to a self-adaptive variable-frequency beating cleaning system and a control method thereof. The belt conveyor comprises a flapping sweeper, a speed reducing motor, a laser vibration measuring sensor, a variable frequency control cabinet and a frequency control cabinet, wherein the flapping sweeper is arranged above a flapping sweeping area of a conveying belt and can be in contact with the conveying belt, the speed reducing motor is used for applying periodic flapping to the surface of the conveying belt to remove attached materials, the speed reducing motor comprises a motor and a speed reducer and is used for driving the flapping sweeper, the laser vibration measuring sensor is arranged above the conveying belt and is used for measuring vibration parameters of the flapping sweeping area of the conveying belt in a non-contact mode, and the variable frequency control cabinet is electrically connected with the motor and the laser vibration measuring sensor and is used for receiving the vibration parameters acquired by the laser vibration measuring sensor and adjusting the working frequency of the motor to enable the flapping sweeper and the flapping sweeping area of the conveying belt to generate resonance. According to the invention, the variable frequency motor is used as a driving source, and the frequency control is used for exciting the specific section of the conveyer belt to generate local resonance, so that the efficient cleaning effect is realized under the condition of lower energy consumption.

Inventors

LI JIAPENG
ZHU LIPING
FU YANG
YUAN HAIPENG
QIU YE
LU ZHOUYAN
SHI YIWEN
SHI CHENG
DAI JIANLI
QIU JINBO
SONG XINGYUAN
CHEN HONGKUI
QIAN KE
LIU CONG
DING PENGFEI

Assignees

中煤科工集团上海有限公司

Dates

Publication Date: 20260508
Application Date: 20260113

Claims (10)

1. An adaptive variable frequency patting cleaning system for a belt conveyor, the system comprising: The flapping sweeper is arranged above the flapping sweeping area of the conveying belt and can be contacted with the conveying belt, and is used for applying periodic flapping to the surface of the conveying belt to remove attached materials; a speed reducing motor (1) comprising a motor and a speed reducer, and used for driving the flapping sweeper; The laser vibration measuring sensor (6) is arranged above the conveying belt and is used for measuring vibration parameters of the cleaning area of the conveying belt in a non-contact manner; The variable frequency control cabinet (9) is electrically connected with the gear motor (1) and the laser vibration measuring sensor (6) and is used for receiving vibration parameters acquired by the laser vibration measuring sensor (6), and adjusting the working frequency of the motor so that the flapping sweeper and the conveying belt flapping sweeping area generate resonance.
2. The system according to claim 1, characterized in that the beater sweeper comprises a beater wheel (4) and a plurality of buffer idlers (5), the plurality of buffer idlers (5) being circumferentially evenly distributed on the beater wheel (4); The system also comprises a sweeper mounting frame (2), wherein a slotted hole is formed in the sweeper mounting frame (2) and an adjusting seat (3) is arranged on the sweeper mounting frame, the flapping sweeper is mounted on the sweeper mounting frame (2) through the adjusting seat (3), and the adjusting seat (3) adopts a top thread structure which is opposite up and down to adjust the contact distance between the flapping wheel (4) and the conveying belt; the speed reducing motor (1) comprises a three-phase alternating current asynchronous variable frequency motor and a helical gear-worm speed reducer connected with the three-phase alternating current asynchronous variable frequency motor, and the speed reducer is in a hollow shaft form.
3. The system according to claim 1, characterized in that the laser vibration measuring sensor (6) is used for realizing multipoint continuous measurement of a specific area of the conveyor belt through an optical scanning mechanism, and generating a vibration distribution cloud image; the system further comprises a vibration measuring sensor mounting frame (7), wherein the vibration measuring sensor mounting frame (7) is separated from the conveyor and the flapping sweeper, and the laser vibration measuring sensor (6) is arranged on the vibration measuring sensor mounting frame (7); the system further comprises two special-shaped carrier rollers (8), wherein the special-shaped carrier rollers (8) support the conveyor belt to beat the cleaning area and are used for limiting resonance to be generated only in the cleaning area.
4. The system according to claim 1, characterized in that the variable frequency control cabinet (9) is connected with a centralized control system of the conveyor to realize synchronous start and stop of the flapping sweeper and the conveyor; the system further comprises an audible and visual alarm (10), wherein the audible and visual alarm (10) is electrically connected with the variable frequency control cabinet (9) and is used for giving an alarm when the laser vibration measuring sensor (6) fails or the vibration parameter exceeds the limit.
5. A control method of the system according to any one of claims 1 to 4, comprising: In the system starting stage, scanning the frequency in a preset frequency range, collecting vibration parameters of a cleaning area of the conveyer belt through the laser vibration measuring sensor (6), and determining an initial resonance reference frequency and a corresponding optimal vibration amplitude; in the running process of the system, vibration parameters of the cleaning area of the conveyer belt are collected in real time, and deviation of the vibration parameters, the optimal vibration amplitude and the resonance reference frequency is calculated; Dynamically adjusting the working frequency of the motor according to the deviation to enable the flapping sweeper and the conveyer belt to flap a cleaning area to maintain a resonance state; And triggering a protection mechanism when the vibration parameter exceeds a preset threshold value.
6. The control method according to claim 5, wherein during the system start-up phase, the frequency is swept within a preset frequency range, vibration parameters of the cleaning area of the belt flapping are collected by the laser vibration measuring sensor (6), and the initial resonance reference frequency and the corresponding optimal vibration amplitude are determined, specifically including: starting the motor according to a preset value of the natural frequency of the measuring and calculating conveyer belt; scanning frequency in a preset range according to a preset step length, and stably operating each frequency for a certain time; Recording a vibration frequency-vibration amplitude curve, extracting the vibration frequency with the maximum vibration amplitude as the resonance reference frequency, taking the corresponding vibration amplitude as the optimal vibration amplitude, and recording the no-load current of the motor as an overload judgment reference.
7. The control method according to claim 5, wherein the step of collecting vibration parameters of the cleaning area of the conveyor belt in real time during operation of the system, and calculating deviation of the vibration parameters from the optimal vibration amplitude and the resonance reference frequency specifically includes: collecting vibration amplitude and vibration frequency through the laser vibration measuring sensor (6), removing noise through low-pass filtering, and calculating average value and fluctuation variance of the filtered signals; The step of dynamically adjusting the working frequency of the motor according to the deviation to enable the flapping sweeper and the conveyer belt to flap a cleaning area to maintain a resonance state specifically comprises the following steps: Setting a target interval by taking the optimal vibration amplitude as a reference, and executing a motor frequency adjustment strategy in three working condition scenes of stable resonance, resonance offset and abrupt working condition change by combining the deviation of the real-time vibration frequency and the resonance reference frequency; The method comprises the steps of judging a resonance stability scene, wherein the judgment condition of the resonance stability scene is that the average value of real-time vibration amplitude is in the target interval and the real-time vibration frequency is not deviated from the resonance reference frequency; The method comprises the steps of judging a resonance offset scene, wherein the judgment condition of the resonance offset scene is that the average value of the real-time vibration amplitude is lower than the lower limit of a target interval, the adjustment strategy of the resonance offset scene is to finely adjust the frequency according to a first step length, and the method comprises the steps of adjusting the motor frequency to the average value of the real-time vibration amplitude according to the first step length to return to the target interval if the real-time vibration frequency is lower than the resonance reference frequency, adjusting the motor frequency according to the first step length if the real-time vibration frequency is higher than the resonance reference frequency, and executing local sweep frequency to update the resonance reference frequency if the average value of the real-time vibration amplitude is not returned to the target interval after the frequency adjustment quantity reaches a threshold value; The adjustment strategy of the working condition abrupt change scene comprises the steps of starting quick adjustment, adjusting the frequency according to a second step length, reducing the output torque of the motor, wherein the second step length is larger than the first step length, and gradually recalling the torque to a rated value after the real-time vibration amplitude average value returns to the target interval.
8. The control method according to claim 5, wherein the protection mechanism includes: When the average value of the real-time vibration amplitude exceeds the preset limit value, the motor frequency is adjusted downwards, an audible and visual alarm is triggered, and if the motor frequency is not recovered within the preset time, the motor is stopped and a fault code is recorded; when the motor current is larger than a preset limit value, reducing the motor frequency and torque until the current returns to a rated range; And (3) sensor fault protection, switching to a preset fixed frequency mode of the conveyer belt and alarming and prompting when the laser vibration measuring sensor (6) has no signal output or abnormal data fluctuation.
9. The control method according to claim 5, wherein the frequency of the motor is such that the belt resonates with the flapping sweeper Beating sweeper frequency With frequency of conveyer belt The relation of (2) is as follows: Wherein p is the pole pair number of the motor, i is the reduction ratio of the speed reducer, s is the slip ratio, r is the number of buffer carrier rollers of the flapping sweeper, and n is a positive integer; natural frequency of the conveying belt is Wherein L is the distance between carrier rollers of the conveyor, T is the tension of the conveyor belt, and mu is the mass of the conveyor belt in unit length.
10. The control method according to claim 5, characterized in that the control method further comprises: recording the associated data of the resonance frequency, the vibration amplitude and the cleaning effect under different load time periods to form a working condition database; automatically executing reference calibration at regular intervals, rescanning in the idle period of the conveyor, and updating the resonance reference frequency; and uploading the operation data to an upper computer through RS485 or Ethernet communication so as to realize remote debugging.

Description

Self-adaptive variable-frequency flapping cleaning system and control method Technical Field The invention relates to the technical field of belt conveyors, in particular to a self-adaptive variable-frequency beating cleaning system and a control method thereof. Background The flange belt conveyor can realize large-inclination angle and even vertical conveying of bulk materials by virtue of a box-type structure formed by the wavy flanges and the transverse partition plates, is widely applied to industries such as coal, metallurgy, building materials, chemical industry and the like, and greatly saves the occupied area of equipment and the investment cost. However, the special structure of the conveyor causes that materials are easy to remain and adhere on the inner side of the flange of the conveyor belt, the gap of the diaphragm plate and the return section, and if the materials are not cleaned timely, the problems of conveyor belt deflection, roller abrasion, energy consumption increase, equipment operation stability reduction, service life and the like are caused, so that the corrugated flange belt conveyor is usually matched with a special cleaning device. The prior cleaning technology is mainly divided into a non-flapping type cleaning technology and a flapping type cleaning technology. The non-beating type cleaning device comprises a scraper cleaner, a brush cleaner and the like, wherein the scraper cleaner is used for scraping materials through rigid contact, but is difficult to adapt to the corrugated structure of a flange, a conveyor belt is easy to scratch, cleaning is not thorough, the brush cleaner is fast in abrasion, the cleaning effect on the materials with strong adhesion is poor, maintenance and replacement are complex, and the shutdown cost is increased. The motor directly or through the rotatory formula of reduction gear driven to pat the sweeper, operating frequency is usually relatively fixed, beats the excitation frequency of sweeper and can not take place resonance with the whole bending mode of conveyer belt under the vast majority condition, and the cleaning effect when facing wet sticky material is unsatisfactory, and the energy consumption is high. Disclosure of Invention In view of the above, the present invention provides an adaptive variable frequency tapping cleaning system and a control method thereof, which solve or at least alleviate one or more of the above-mentioned and other problems with the prior art. To achieve the foregoing object, a first aspect of the present invention provides an adaptive variable frequency tapping cleaning system for a belt conveyor, the system comprising: The flapping sweeper is arranged above the flapping sweeping area of the conveying belt and can be contacted with the conveying belt, and is used for applying periodic flapping to the surface of the conveying belt to remove attached materials; The speed reducing motor comprises a motor and a speed reducer and is used for driving the flapping sweeper; the laser vibration measuring sensor is arranged above the conveying belt and is used for measuring vibration parameters of the cleaning area of the conveying belt in a non-contact manner; The variable frequency control cabinet is electrically connected with the speed reducing motor and the laser vibration measuring sensor and is used for receiving vibration parameters acquired by the laser vibration measuring sensor and adjusting the working frequency of the motor so that the flapping sweeper and the conveying belt flap sweeping area generate resonance. In the system as described above, optionally, the flapping sweeper comprises a flapping wheel and a plurality of buffer idlers, wherein the plurality of buffer idlers are uniformly distributed on the flapping wheel in the circumferential direction; the system also comprises a sweeper mounting frame, wherein a slotted hole is formed in the sweeper mounting frame and an adjusting seat is arranged on the sweeper mounting frame, the flapping sweeper is mounted on the sweeper mounting frame through the adjusting seat, and the adjusting seat adopts a top thread structure which is opposite up and down so as to adjust the contact distance between the flapping wheels and the conveying belt; the speed reducing motor comprises a three-phase alternating current asynchronous variable frequency motor and an inclined tooth-worm gear speed reducer connected with the three-phase alternating current asynchronous variable frequency motor, and the speed reducer is in a hollow shaft form. In the system as described above, optionally, the laser vibration measuring sensor is used for realizing multipoint continuous measurement of a specific area of the conveyor belt through an optical scanning mechanism, and generating a vibration distribution cloud chart; The system also comprises a vibration measuring sensor mounting frame, wherein the vibration measuring sensor mounting frame is arranged separately from the conveyor an