A butterfly valve monitoring system with switch quantity acquisition

Abstract

The present invention relates to the field of butterfly valve monitoring technology, and more specifically, to a butterfly valve and monitoring system with switch quantity acquisition. It includes a pulse signal analysis module and an abnormal switch quantity monitoring module. The present invention obtains the switch quantity of the butterfly valve in real time through a rotary encoder, and in a specific monitoring process, responds to the abnormal vibration feedback signal through the pulse signal analysis module, analyzes and processes the current pulse signal, obtains the end timing range, and divides the end timing range into a stable interval and a fluctuation interval, and adjusts the stable interval to the fluctuation interval by changing the switch quantity, changes the signal variation range, and intuitively feeds back the changes of the corresponding timing points under different time states, thereby improving the monitoring accuracy and avoiding the monitoring error caused by the stable interval. At the same time, the abnormal switch quantity monitoring module is used to obtain the corresponding adjustment path and judgment result, and predict the switch quantity fluctuation range of the butterfly valve as a basis for later maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of butterfly valve monitoring, in particular to a butterfly valve monitoring system with switch quantity acquisition. Background Art

[0002] A butterfly valve is a valve that controls the flow or regulation of fluid by rotating a disc-shaped butterfly plate. Its core features are compact structure, rapid opening and closing, and suitability for large-diameter pipelines.

[0003] Since the main function of the butterfly valve is to control the on-off of the fluid, specifically to adjust the amount of fluid flowing through it, its switching value is proportional to the amount of fluid flowing through it. Monitoring the switching value will be able to indirectly feedback the current fluid amount.

[0004] The traditional monitoring methods for the switching value of butterfly valves are mainly divided into observation method and rotation monitoring method. The observation method is to obtain the current switching value of the butterfly valve by observing the rotation angle of the control dial. This method can only be estimated and is interfered by external factors. The error of the switching value obtained is large. Another method uses a rotary encoder for angle monitoring to obtain the level change signal under different switching value states as the basis for evaluating the current switching value. Although this method can effectively improve the monitoring accuracy, in actual use, due to the long-term work of the shaft, its wear degree continues to increase, and it is easy to form a gap with the shell. When the fluid passes through the inner end of the valve body, it will generate thrust on the internal valve plate, and the shaft after the gap is formed will reciprocate due to the thrust. At this time, the valve plate will swing left and right, causing the level change signal obtained at this time to fluctuate. The level change signal has a stable area and a change area, such as Figure 5 As shown, In the stable area, the corresponding In the change zone, the corresponding level change signal has a large change in this interval. When the monitored switch quantity is in the stable zone at this time, the change is not obvious enough, making it impossible to determine whether the current jitter is caused by valve body wear.

[0005] In order to address the above problems, there is an urgent need for a butterfly valve with switch quantity acquisition and a monitoring system with adaptive adjustment of the monitoring range. Summary of the Invention

[0006] The object of the present invention is to provide a monitoring system for a butterfly valve with switch quantity collection, wherein a rotary encoder for recording the switch quantity of the valve leaf is connected to the rotating shaft, and a vibration sensor for vibration monitoring is provided at the inner end of the valve head. At the same time, an abnormal signal response module is used to formulate a vibration feedback signal threshold, and a response evaluation is performed on the vibration signal collected by the vibration sensor, and the abnormal vibration feedback signal and the normal vibration feedback signal are divided. The pulse signal analysis module is used to respond to the abnormal vibration feedback signal, and the current pulse signal is analyzed and processed to obtain the end time sequence range, and the end time sequence range is divided into a stable interval and a fluctuation interval, and the end time sequence range marked as the fluctuation interval is adjusted, and an intuitive monitoring process is performed to solve the problems raised in the above background technology:

[0007] When the level change signal is in the stable region, its change is not obvious enough to determine whether the current jitter is caused by valve body wear.

[0008] To achieve the above objectives, one of the objectives of the present invention is to provide a butterfly valve with switch quantity collection, comprising a valve body, a valve leaf installed at the inner end of the valve body, and a valve head installed at the top end of the valve body, wherein the inner end of the valve head and the side of the valve leaf are coaxially connected to a rotating shaft, a turntable is provided on the side of the valve head, and a connecting drive shaft is coaxially connected to the side of the turntable, and the drive shaft drives the rotating shaft to rotate through meshing gears;

[0009] Furthermore, in order to collect the on / off status of the valve leaf in real time, a rotary encoder for recording the on / off status of the valve leaf is connected to the rotating shaft, and the rotary encoder includes a grating plate coaxially connected to the rotating shaft, a prism is provided on one side of the grating plate, and a light-emitting diode providing a light source is provided on the side of the prism, and a fixed grating is provided on the other side of the grating plate, and the centers of the fixed grating, prism and light-emitting diode are on the same horizontal line, a pair of photosensitive tubes are symmetrically provided on the side of the fixed grating, and a plurality of grids are arrayed on the side of the grating plate;

[0010] The grating plate rotates synchronously with the rotating shaft to intermittently block the light source projected by the light-emitting diode, so that the photosensitive tube generates different high and low level change signals;

[0011] Furthermore, in order to perform vibration feedback, a vibration sensor for vibration monitoring is provided at the inner end of the valve head.

[0012] The second object of the present invention is to provide a butterfly valve monitoring system with switch quantity acquisition, including a real-time signal acquisition module, an abnormal signal response module, a pulse signal analysis module and an abnormal switch quantity monitoring module;

[0013] The real-time signal acquisition module is used to collect motor drive signals, pulse signals, and vibration feedback signals as the objects of subsequent evaluation, and cooperates with the abnormal signal response module to distinguish abnormal vibration feedback signals from normal vibration feedback signals;

[0014] When the collected vibration feedback signal is an abnormal vibration feedback signal, the pulse signal analysis module analyzes and processes the current pulse signal to obtain the end time series range, and divides the end time series range into a stable interval and a fluctuating interval;

[0015] If the divided end timing range is in the stable interval, the vibration analysis cannot be performed intuitively because the signal change is not obvious enough. At this time, the pulse signal analysis module is used to adjust the end timing range in the stable interval to the most adjacent fluctuation interval, and intermittently obtain the end timing range feedback at different time points for analysis, and determine whether it is an abnormal fluctuation interval based on the signal change.

[0016] Furthermore, in order to determine the current degree of wear of the butterfly valve, the corresponding adjustment path and judgment results are obtained through the abnormal switch quantity monitoring module, and the switch quantity fluctuation range of the butterfly valve is predicted. The pulse signal waveforms collected at different time points are analyzed, and the timing points of each end are collected. The timing point range is divided, and the switch quantity fluctuation range is located through the timing point range, that is, the current degree of wear of the butterfly valve is fed back.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] In the butterfly valve and monitoring system with switch quantity acquisition, the switch quantity of the butterfly valve is obtained in real time through a rotary encoder. In the specific monitoring process, the abnormal vibration feedback signal is responded to by the pulse signal analysis module, and the current pulse signal is analyzed and processed to obtain the end timing range, and the end timing range is divided into a stable interval and a fluctuation interval. The stable interval is adjusted to the fluctuation interval by changing the switch quantity, and the signal variation range is changed. The changes of the corresponding timing points under different time states are intuitively fed back, the monitoring accuracy is improved, and the monitoring error caused by the stable interval is avoided. At the same time, the abnormal switch quantity monitoring module is cooperated to obtain the corresponding adjustment path and judgment result, and the switch quantity fluctuation range of the butterfly valve is predicted as a basis for later maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a block diagram of the overall system structure of the present invention;

[0021] Figure 3 This is a pulse signal simulation diagram of the rotating shaft in the forward rotation state of the present invention;

[0022] Figure 4 This is a pulse signal simulation diagram of the present invention in the state of the rotating shaft being reversed;

[0023] Figure 5 This is a signal interval adjustment simulation diagram of the present invention;

[0024] Figure 6 It is a schematic diagram of the overall system flow of the present invention.

[0025] The meaning of each number in the figure is:

[0026] 10. Valve body;

[0027] 20. Valve head; 210. Vibration sensor;

[0028] 30. Turntable; 310. Drive shaft;

[0029] 40. Valve leaf; 410. Rotating shaft; 411. Grating plate; 412. Light-emitting diode; 413. Prism; 414. Fixed grating; 415. Photosensitive tube. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] See also Figure 1As shown, one of the purposes of the present invention is to provide a butterfly valve with switch quantity collection, including a valve body 10, a valve leaf 40 installed at the inner end of the valve body 10, and a valve head 20 installed at the top of the valve body 10. The inner end of the valve head 20 is coaxially connected to the side position of the valve leaf 40 with a rotating shaft 410. A turntable 30 is provided on the side of the valve head 20. The side of the turntable 30 is coaxially connected to a connecting drive shaft 310. The drive shaft 310 drives the rotating shaft 410 to rotate through meshing gears. A rotary encoder that records the switch quantity of the valve leaf 40 is connected to the rotating shaft 410. The inner end of the valve head 20 is provided with a rotary disk 30. A vibration sensor 210 for vibration monitoring is provided. The rotary encoder includes a grating plate 411 coaxially connected to a rotating shaft 410. A prism 413 is provided on one side of the grating plate 411. A light-emitting diode 412 is provided on the side of the prism 413 to provide a light source. A fixed grating 414 is provided on the other side of the grating plate 411. The centers of the fixed grating 414, the prism 413, and the light-emitting diode 412 are coaxially aligned. A pair of photosensitive tubes 415 are symmetrically provided on the side of the fixed grating 414. A plurality of grids are arranged in an array on the side of the grating plate 411.

[0033] The grating plate 411 rotates synchronously with the rotating shaft 410 to intermittently block the light source projected by the light emitting diode 412, so that the photosensitive tube 415 generates different high and low level change signals.

[0034] During the specific collection process, the drive shaft 310 is driven to rotate by the turntable 30. During specific use, the axis position of the turntable 30 can be coaxially connected to the motor, which can be manually driven or mechanically driven. The drive shaft 310 and the rotating shaft 410 are driven by meshing gears, and the drive shaft 310 drives the valve leaf 40 and the rotating shaft 410 to rotate synchronously, thereby changing the offset angle of the valve leaf 40 at the inner end of the valve body 10 and adaptively adjusting the amount of fluid passing through the fluid.

[0035] Since the valve leaf 40 is located at the inner end of the valve body 10, the current position of the rotating shaft 410 cannot be directly observed through the valve body 10 during use. In this solution, a rotary encoder is used to provide real-time feedback on the rotation angle of the rotating shaft 410. The specific principle is as follows:

[0036] Light is emitted outward through the light-emitting diode 412 and transmitted to the side of the grating plate 411 through the prism 413. A plurality of grids are arranged in an array on the side of the grating plate 411, and the grating plate 411 rotates synchronously with the rotating shaft 410, that is, the position of each grid is adjusted in real time to block the passing light source in an intermittent manner. The unblocked light source is transmitted through the grating plate 411 to the side of the fixed grating 414, and is transmitted to the two photosensitive tubes 415 through the fixed grating 414. At this time, the high and low level change signals displayed by the photosensitive tubes 415 will change due to the change in the rotation angle of the rotating shaft 410. The monitoring personnel can feedback the current switching value of the butterfly valve through the final high and low level change signals.

[0037] See also Figure 2 As shown, the second object of the present invention is to provide a butterfly valve monitoring system with switch quantity acquisition, including a real-time signal acquisition module, an abnormal signal response module, a pulse signal analysis module and an abnormal switch quantity monitoring module;

[0038] The real-time signal acquisition module is used to collect the motor drive signal under the motor drive, the pulse signal displayed by the photosensitive tube 415 and the vibration feedback signal fed back by the vibration sensor 210;

[0039] The abnormal signal response module is used to set a vibration feedback signal threshold and compare it with the collected vibration feedback signal, marking the vibration feedback signal that exceeds the vibration feedback signal threshold as an abnormal vibration feedback signal, otherwise it is marked as a normal vibration feedback signal;

[0040] The pulse signal analysis module responds to the abnormal vibration feedback signal, analyzes and processes the current pulse signal, obtains the end time sequence range, and divides the end time sequence range into a stable interval and a fluctuating interval;

[0041] When the end timing range is in the fluctuation range, the end timing range feedback at different time points is obtained intermittently for analysis, and the signal change is used to determine whether it is an abnormal fluctuation range.

[0042] When the end time series range is in the stable interval, the stable interval is adjusted to the nearest fluctuation interval. The end time series range feedback at different time points is obtained intermittently for analysis. The signal change is used to determine whether it is an abnormal fluctuation interval.

[0043] When two signals at adjacent timing points are not in the same square wave, it indicates that the timing range of the current end is an abnormal fluctuation range, otherwise it is a normal fluctuation range;

[0044] The abnormal switch quantity monitoring module obtains the corresponding adjustment path and judgment results, and predicts the switching quantity fluctuation range of the butterfly valve.

[0045] In specific use, when the entire butterfly valve vibrates after being impacted by fluid, it is impossible to determine whether the current vibration is caused by the vibration of the valve leaf 40 or other mechanical vibrations. If the vibration is caused by the valve leaf 40, the final switch quantity monitoring will be affected, so it is necessary to analyze the cause of the vibration in advance;

[0046] In order to deal with the above problems, in the specific monitoring process, the motor driving signal under the motor drive, the pulse signal displayed by the photosensitive tube 415 and the vibration feedback signal fed back by the vibration sensor 210 are collected through the real-time signal acquisition module, wherein the motor driving signal is the speed and rotation amount of the motor, and the pulse signal is the high and low level change signal, such as Figure 1 Signal 1 and Signal 2 in the figure, wherein the power supply is the power supply for signal analysis, and the corresponding vibration feedback signal is the vibration feedback signal detected by the vibration sensor 210 after the entire butterfly valve vibrates, including the jitter generated when the fluid passes through the valve leaf 40 and other mechanical vibrations;

[0047] When the rotating shaft 410 is worn and a gap is generated between it and the valve head 20, the valve leaf 40 will vibrate when pushed by the fluid, resulting in an error in the final monitored switch value. At this time, the abnormal signal response module sets a vibration feedback signal threshold and compares it with the collected vibration feedback signal. The vibration feedback signal that exceeds the vibration feedback signal threshold is marked as an abnormal vibration feedback signal, otherwise it is marked as a normal vibration feedback signal.

[0048] Since the corresponding vibration amount is different under different flow conditions, the corresponding vibration amplitude will also be different. When formulating the vibration feedback signal threshold, the actual flow rate needs to be considered. The specific formulation content is as follows:

[0049] First, based on the cross-sectional dimensions of the pipe connected to the butterfly valve, the maximum flow rate allowed to flow at its inner end is obtained. The switching value of the butterfly valve controls the size of the flow rate. For butterfly valves under different switching values, if the flow rate flowing through the pipe is constant, the smaller the switching value, the greater the corresponding pressure. Therefore, in the actual process of formulating the vibration feedback signal threshold, historical simulation data is used, that is, data verification is performed on the basis of a qualified valve body to ensure that the amount of fluid passing through the pipe is consistent each time, and unit adjustments are made within the valve body switching value adjustment range. For example, in the adjustment range of 0-90°, the switching value is adjusted by 5° each time, and the vibration generated by the fluid passing through the valve body is obtained in real time through the vibration sensor, and the maximum vibration signal captured under the current switching value conditions is marked as the vibration feedback signal threshold. In the actual comparison process, it is necessary to obtain the real-time collected vibration signal, obtain the peak point through the vibration signal waveform, compare the peak point with the vibration feedback signal threshold, and determine whether it exceeds the current threshold.

[0050] After completing the vibration signal determination work, since external mechanical vibration will also affect the monitoring results, in order to verify that the current vibration signal is caused by the wear of the rotating shaft 410, it is necessary to respond to the abnormal vibration feedback signal through the pulse signal analysis module, analyze and process the current pulse signal, and obtain the end timing range. Figure 3-Figure 4 As shown in the figure, the acquired pulse signal includes three phases, namely A signal, B signal and Z signal. Due to the angular deviation between the two sets of grids, two sets of A / B signals with a phase deviation of 90° are generated. When the rotary encoder rotates one circle, the Z phase only sends one pulse at a fixed position, so it can be used as a reset phase or zero phase.

[0051] Since there are forward and reverse rotations in the specific rotation process, and the pulse signal simulation diagrams formed by forward and reverse rotations are different, it is necessary to determine the rotation direction in advance for subsequent judgment. When rotating clockwise (forward), the A signal is 90° ahead of the B signal. When rotating counterclockwise (reverse), the B signal is 90° ahead of the A signal. When the circuit receives the A and B signals from the rotary encoder, it can determine the rotation direction of the encoder based on the combination of the A and B states.

[0052] like Figure 1 As shown in the figure, when the A signal is rising, the B signal is low level, or when the A signal is falling, the B signal is high level, which proves that the encoder is currently rotating clockwise;

[0053] like Figure 2 As shown in the figure, when the A signal is rising, the B signal is high level, or when the A signal is falling, the B signal is low level, which proves that the encoder is rotating counterclockwise.

[0054] Due to different switching degrees, the length of the final collected signal is different. After vibration occurs, the signals collected at different time points can be synchronously compared to obtain the change state of the signal end. However, in actual situations, due to the uncertainty of vibration frequency and vibration amplitude, the change is small at this time. If the same time sequence points collected at different time points are in the same square wave, that is, the corresponding horizontal signal values ​​are the same at this time, it will be difficult to distinguish if the change is small. Therefore, in the specific monitoring process, the end time sequence range needs to be divided in advance into a stable interval and a fluctuating interval. The division method is as follows:

[0055] First, obtain the waveforms of signal A and signal B at different times and collect the end timing points, such as Figure 5 As shown, the corresponding end timing point is , formulate the unit timing quantity, obtain the adjacent timing points of the end timing point, such as Figure 5 As shown, the end timing point The adjacent timing points of , that is, the difference between the two is a unit timing amount, and the range formed by the adjacent timing points and the end timing points is marked as the end timing range. It is determined whether the current end timing range belongs to the same square wave. If it belongs to the same square wave, the current end timing range is marked as a stable interval. If it does not belong to the same square wave, it indicates that there is a signal difference in the front end timing range, and the corresponding range is a fluctuation interval;

[0056] Furthermore, when the corresponding end timing ranges in the waveforms of signal A and signal B collected at different times all belong to the same stable interval, it indicates that the vibration change cannot be directly determined at this time, so the end timing range needs to be adjusted, and the end timing range is related to the switching value. The end timing range can be changed by adjusting the switching value. In this scheme, in order to ensure the monitoring accuracy, the adjustment amount is the same each time, that is, the unit adjustment amount. The unit adjustment amount corresponds to the unit switching amount. That is, after adjusting the unit switching amount each time, the waveforms of signal A and signal B are collected at different time points to determine the end timing range. If the two are not in the same square wave at this time, that is, there is a signal difference between the two, such as Figure 5 As shown, the adjusted end timing range is , corresponding to the fluctuation range, at this time, if the vibration is caused by the wear of the rotating shaft 410, the change amount at the two time points is obvious, that is, one up and one down, such as Figure 5 As shown, the corresponding end timing range in the B signal simulation diagram is , it has an upper edge interval and a lower edge interval, which means that the square waves corresponding to the end timing points corresponding to different times may be different, and the different square waves mean that the corresponding change interval at this time is large. It can be immediately determined that the current vibration cause is caused by the wear of the rotating shaft 410. At this time, the adjusted fluctuation interval will be marked as an abnormal fluctuation interval.

[0057] Finally, the corresponding adjustment path and judgment results are obtained through the abnormal switch quantity monitoring module to predict the switching quantity fluctuation range of the butterfly valve. The specific prediction method is as follows:

[0058] First, obtain the waveforms of signal A and signal B at different time points, and obtain the signal quantities corresponding to each end timing point within the fluctuation range, that is, the signal quantity output belonging to the upper edge position of the square wave is 1, and the signal quantity output belonging to the lower edge position of the square wave is 0. According to the corresponding signal quantities, signal sets are established respectively, namely the upper edge position signal set and the lower edge position signal set, and the longest end timing point and the shortest end timing point in the signal set are obtained. The length here represents the length of time. The timing point range formed by the longest end timing point and the shortest end timing point is obtained, and compared with the unit timing quantity, and the switching quantity fluctuation range = timing point range / unit timing quantity × switching quantity corresponding to the unit timing quantity is calculated.

[0059] The final specific process is as follows Figure 6As shown, first, the real-time vibration feedback signal is input and the threshold value of the vibration feedback signal is determined. When the current vibration feedback signal exceeds the vibration threshold, the output vibration feedback signal is a normal vibration feedback signal. Otherwise, the real-time pulse signal is collected and it is determined whether the current real-time pulse signal belongs to the stable interval.

[0060] If it is not in the stable range, it means it is in the fluctuation range. In this case, there is no need to adjust the switch value, and the signal fluctuation determination is directly performed, that is, the signal value corresponding to the timing point of the lower end at different time points is collected. If there is no change, it indicates that the vibration is not caused by the wear of the rotating shaft 410. At this time, the output pulse signal is marked as a normal pulse signal. On the contrary, if the signal value corresponding to the timing point of the lower end at different time points changes, it indicates that the vibration is caused by the wear of the rotating shaft 410. At this time, the output pulse signal is marked as an abnormal pulse signal.

[0061] If it belongs to the stable range, in order to ensure the subsequent monitoring effect, the unit adjustment amount needs to be adjusted. After each adjustment, an interval judgment needs to be made until the interval is adjusted to the fluctuation range, and the judgment is made according to the above-mentioned fluctuation range judgment method.

[0062] The present invention obtains the switching value of the butterfly valve in real time through a rotary encoder, and in a specific monitoring process, responds to the abnormal vibration feedback signal through a pulse signal analysis module, analyzes and processes the current pulse signal, obtains the end timing range, and divides the end timing range into a stable interval and a fluctuation interval, and adjusts the stable interval to the fluctuation interval by changing the switching value, changes the signal change range, and intuitively feeds back the changes of the corresponding timing points under different time states, thereby improving the monitoring accuracy and avoiding the monitoring error caused by the stable interval. At the same time, the abnormal switching value monitoring module is cooperated to obtain the corresponding adjustment path and judgment result, and the switching value fluctuation range of the butterfly valve is predicted as a basis for later maintenance.

[0063] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A butterfly valve monitoring system with switch quantity acquisition, characterized by: It includes butterfly valve, real-time signal acquisition module, abnormal signal response module, pulse signal analysis module and abnormal switch quantity monitoring module; The butterfly valve comprises a valve body (10), a valve leaf (40) mounted on the inner end of the valve body (10), and a valve head (20) mounted on the top end of the valve body (10), wherein the inner end of the valve head (20) is coaxially connected to a rotating shaft (410) with the side position of the valve leaf (40), a turntable (30) is provided on the side of the valve head (20), and a connecting drive shaft (310) is coaxially connected to the side of the turntable (30), and the drive shaft (310) drives the rotating shaft (410) to rotate through meshing gears, and a rotary encoder for recording the switching value of the valve leaf (40) is connected to the rotating shaft (410), characterized in that: the inner end of the valve head (20) is provided with a rotary encoder for recording the switching value of the valve leaf (40). A vibration sensor (210) for vibration monitoring, wherein the rotary encoder comprises a grating plate (411) coaxially connected to the rotating shaft (410), a prism (413) being provided on one side of the grating plate (411), a light-emitting diode (412) providing a light source being provided on the side of the prism (413), a fixed grating (414) being provided on the other side of the grating plate (411), and the centers of the fixed grating (414), the prism (413) and the light-emitting diode (412) being on the same horizontal line, a pair of photosensitive tubes (415) being symmetrically provided on the side of the fixed grating (414), and a plurality of grids being arranged in an array on the side of the grating plate (411); The grating plate (411) rotates synchronously with the rotating shaft (410), intermittently shielding the light source projected by the light-emitting diode (412), so that the photosensitive tube (415) generates different high and low level change signals; The real-time signal acquisition module is used to acquire the motor drive signal under motor drive, the pulse signal displayed by the photosensitive tube (415), and the vibration feedback signal fed back by the vibration sensor (210); The abnormal signal response module is used to formulate a vibration feedback signal threshold and compare it with the collected vibration feedback signal, marking the vibration feedback signal that exceeds the vibration feedback signal threshold as an abnormal vibration feedback signal, otherwise it is marked as a normal vibration feedback signal; The pulse signal analysis module responds to the abnormal vibration feedback signal, analyzes and processes the current pulse signal, obtains the end time sequence range, and divides the end time sequence range into a stable interval and a fluctuating interval; When the end timing range is in the fluctuation range, the end timing range feedback at different time points is obtained intermittently for analysis, and the signal change is used to determine whether it is an abnormal fluctuation range. When the end time series range is in the stable interval, the stable interval is adjusted to the nearest fluctuation interval. The end time series range feedback at different time points is obtained intermittently for analysis. The signal change is used to determine whether it is an abnormal fluctuation interval. When two signals at adjacent timing points are not in the same square wave, it indicates that the timing range of the current end is an abnormal fluctuation range, otherwise it is a normal fluctuation range; The abnormal switch value monitoring module obtains the corresponding adjustment path and judgment result, and predicts the switch value fluctuation range of the butterfly valve.

2. The monitoring system according to claim 1, wherein: The method for formulating the vibration feedback signal threshold in the abnormal signal response module comprises the following steps: S1. Based on the cross-sectional dimensions of the pipe connected to the butterfly valve, obtain the maximum flow rate allowed at its inner end; S2. Based on historical simulation data, the valve body is adjusted within the switching range, and the vibration sensor is used to obtain the vibration generated by the fluid passing through the valve body in real time. S3. Mark the maximum vibration signal captured under the current switching value condition as the vibration feedback signal threshold.

3. The monitoring system according to claim 1, wherein: The method for analyzing and processing the pulse signal in the pulse signal analysis module comprises the following steps: S10, determining the rotation direction in advance; When rotating clockwise, signal A leads signal B by 90°; When rotating counterclockwise, the B signal advances the A signal by 90°; S20, determining the rotation direction of the encoder according to the state combination of the A signal and the B signal; When the A signal is rising, the B signal is low level, or when the A signal is falling, the B signal is high level, which proves that the encoder is rotating clockwise. When the A signal is rising, the B signal is high, or when the A signal is falling, the B signal is low, which proves that the encoder is currently rotating counterclockwise.

4. The monitoring system according to claim 3, wherein: The method for dividing the end timing range in the pulse signal analysis module includes the following steps: S30, obtaining waveforms of signal A and signal B at different times, and collecting end timing points; S40, establishing a unit time series quantity, and obtaining adjacent time series points of the end time series point; S50, marking a range formed by adjacent timing points and the end timing point as an end timing range, and determining whether the current end timing range belongs to the same square wave; When they belong to the same square wave, the current end timing range is marked as a stable interval; When they do not belong to the same square wave, it indicates that there is a signal difference in the timing range of the front end, and the corresponding range is the fluctuation range.

5. The monitoring system according to claim 4, characterized in that: The method for adjusting the stable interval in the pulse signal analysis module comprises the following steps: S60, adjusting the end timing range by a unit adjustment amount; S70, collecting waveforms of signal A and signal B at different time points to determine the end timing range; If the signal quantities of the end timing points corresponding to the two time points are not in the same square wave, there is a signal difference between the two, corresponding to the fluctuation range; On the contrary, when the signal quantities of the end timing points corresponding to the two time points are in the same square wave, there is no signal difference between the two, corresponding to the stable interval, and a secondary unit adjustment amount is adjusted, and steps S60 and S70 are repeated until it is determined to be a fluctuation interval.

6. The monitoring system according to claim 5, characterized in that: The unit adjustment value in S60 corresponds to the unit switching value.

7. The monitoring system according to claim 1, wherein: The method for predicting the switching value fluctuation range of the butterfly valve in the abnormal switching value monitoring module includes the following steps: S100, obtaining waveforms of signal A and signal B at different time points, and obtaining the signal quantity corresponding to each end timing point within the fluctuation range; S200, the signal quantity at the rising edge of the square wave is output as 1, the signal quantity at the falling edge of the square wave is output as 0, and signal sets are established according to the corresponding signal quantities; S300, obtaining the longest end timing point and the shortest end timing point in the signal set, and obtaining a timing point range formed by the longest end timing point and the shortest end timing point; S400 , comparing the timing point range formed by the longest end timing point and the shortest end timing point with the unit timing quantity, and calculating the switching quantity fluctuation range = timing point range / unit timing quantity × switching quantity corresponding to the unit timing quantity.

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