Butterfly valve with switching value acquisition function and monitoring system

Abstract

The invention relates to the technical field of butterfly valve monitoring, in particular to a butterfly valve with a switching value acquisition function and a monitoring system. The device comprises a pulse signal analysis module and an abnormal switching value monitoring module. The switching value of the butterfly valve is obtained in real time through the rotary encoder, in the specific monitoring process, the pulse signal analysis module responds to an abnormal vibration feedback signal, the current pulse signal is analyzed and processed, the end time sequence range is obtained, the end time sequence range is divided into a stable interval and a fluctuation interval, and the stable interval and the fluctuation interval are obtained. The stable interval is adjusted to the fluctuation interval by changing the switching value, the signal variation range is changed, changes of corresponding time sequence points in different time states are visually fed back, the monitoring accuracy is improved, monitoring errors caused by the stable interval are avoided, meanwhile, the abnormal switching value monitoring module is matched to obtain a corresponding adjustment path and a judgment result, and the judgment accuracy is improved. And predicting the switching value 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, and more specifically, to a butterfly valve with switch quantity acquisition and a monitoring system thereof. Background Art

[0002] A butterfly valve is a valve that controls the on / off 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 regulate the amount of fluid flowing through, its switch quantity is proportional to the amount of fluid flowing through. Monitoring the switch quantity can indirectly reflect the current fluid quantity.

[0004] Traditional methods for monitoring the switch quantity of butterfly valves mainly include the observation method and the rotation monitoring method. The observation method is to obtain the current switch quantity of the butterfly valve by observing the rotation angle of the control turntable. This method can only make an estimate and is affected by external factors, resulting in a large error in the obtained switch quantity. The other method uses a rotary encoder to monitor the angle and obtain the level change signal under different switch quantity states as the basis for evaluating the current switch quantity. Although this method can effectively improve the monitoring accuracy, in the specific use process, due to the long-term operation of the rotating shaft, its wear degree continuously increases, and it is easy to form a gap with the outer shell. When the fluid passes through the inner end of the valve body, it will generate a thrust on the internal valve plate, and the rotating shaft with the gap will reciprocally deflect due to the thrust. At this time, the valve plate will swing left and right, causing the obtained level change signal to fluctuate. The level change signal has a stable area and a changing area. As Figure 5 shown, where x1 - x2 is in the stable area, and the corresponding x3 - x4 is in the changing area. The change amount of the corresponding level change signal in this interval is relatively large. When the monitored switch quantity is in the stable area, since the change is not obvious enough, it is 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 that adaptively adjusts the monitoring range. Summary of the Invention

[0006] The object of the present invention is to provide a butterfly valve with switch quantity acquisition and a monitoring system. A rotary encoder for recording the switch quantity of the valve leaf is connected to the rotating shaft. A vibration sensor for vibration monitoring is arranged 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 to evaluate the response of the vibration signal collected by the vibration sensor, divide the abnormal vibration feedback signal and the normal vibration feedback signal, cooperate with the pulse signal analysis module to respond to the abnormal vibration feedback signal, analyze and process the current pulse signal, obtain the end timing range, divide the end timing range into a stable interval and a fluctuation interval, and adjust the end timing range marked as the fluctuation interval for intuitive monitoring processing to solve the problems raised in the above background technology:

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

[0008] To achieve the above object, one of the objects of the present invention is to provide a butterfly valve with switch quantity acquisition, including a valve body, a valve leaf installed at the inner end of the valve body, and a valve head installed at the top of the valve body. A rotating shaft is coaxially connected to the inner end of the valve head and the side of the valve leaf. A turntable is arranged on the side of the valve head, and a connecting drive shaft is coaxially connected to the side of the turntable. The drive shaft drives the rotating shaft to rotate through meshing gears;

[0009] Further, in order to collect the switch quantity state of the valve leaf in real time, a rotary encoder for recording the switch quantity of the valve leaf is connected to the rotating shaft. The rotary encoder includes a grating plate coaxially connected to the rotating shaft. A prism is arranged on one side of the grating plate, and a light-emitting diode for providing a light source is arranged on the side of the prism. A fixed grating is arranged on the other side of the grating plate, and the centers of the fixed grating, the prism, and the light-emitting diode are on the same horizontal line. A pair of photodiodes are symmetrically arranged on the side of the fixed grating, and a plurality of grids are arranged in an array on the side of the grating plate;

[0010] The grating plate rotates synchronously with the rotating shaft, intermittently blocking the light source projected by the light-emitting diode, so that the photodiodes generate different high and low level change signals;

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

[0012] Another object of the present invention is to provide a monitoring system for realizing a butterfly valve 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] Among them, the real-time signal acquisition module is used to acquire motor drive signals, pulse signals, and vibration feedback signals, which serve as the objects for subsequent evaluation, and cooperate with the abnormal signal response module to distinguish abnormal vibration feedback signals from normal vibration feedback signals.

[0014] When the acquired vibration feedback signal is an abnormal vibration feedback signal, the current pulse signal is analyzed and processed by the pulse signal analysis module to obtain the end timing range, and the end timing range is divided into a stable interval and a fluctuating interval.

[0015] If the divided end timing range is in the stable interval, since the signal change amount is not obvious enough to visually perform vibration analysis, at this time, the pulse signal analysis module adjusts the end timing range in the stable interval to the closest fluctuating interval, and intermittently obtains the end timing ranges fed back at different time points for analysis, and determines whether it is an abnormal fluctuating interval through the signal change amount.

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

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[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 the rotary encoder, and in the specific monitoring process, the pulse signal analysis module responds to the abnormal vibration feedback signal, analyzes and processes the current pulse signal, obtains the end timing range, divides the end timing range into a stable interval and a fluctuating interval, and adjusts the stable interval to the fluctuating interval by changing the switch quantity, changing the signal change amount range, visually feeding back the changes of the corresponding timing points in different time states, improving the monitoring accuracy, avoiding the monitoring error caused by the stable interval, and at the same time cooperating with the abnormal switch quantity monitoring module to obtain the corresponding adjustment path and determination result, predicting the switch quantity fluctuation range of the butterfly valve, which serves as the basis for later maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall structural schematic diagram of the present invention;

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

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

[0022] Figure 4 It is the pulse signal simulation diagram under the reverse rotation state of the rotating shaft of the present invention;

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

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

[0025] The meanings of each label in the figure are as follows:

[0026] 10. Valve body;

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

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

[0029] 40. Valve vane; 410. Rotating shaft; 411. Grating plate; 412. Light emitting diode; 413. Prism; 414. Fixed grating; 415. Photo-sensitive tube. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is 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 construed as a limitation to the present invention.

[0032] Please refer to Figure 1As shown in the figure, one of the purposes of the present invention is to provide a butterfly valve with switch quantity acquisition, which includes 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 end of the valve body 10. A rotating shaft 410 is coaxially connected between the inner end of the valve head 20 and the side of the valve leaf 40. A turntable 30 is arranged on the side of the valve head 20, and a connecting drive shaft 310 is coaxially connected to the side of the turntable 30. The drive shaft 310 drives the rotating shaft 410 to rotate through meshing gears. A rotary encoder for recording the switch quantity of the valve leaf 40 is connected to the rotating shaft 410. A vibration sensor 210 for vibration monitoring is arranged at the inner end of the valve head 20. The rotary encoder includes a grating plate 411 that remains coaxially connected to the rotating shaft 410. A prism 413 is arranged on one side of the grating plate 411, and a light-emitting diode 412 for providing a light source is arranged on the side of the prism 413. A fixed grating 414 is arranged 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 are on the same horizontal line. A pair of photosensitive tubes 415 are symmetrically arranged on the side of the fixed grating 414, and a number 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, intermittently blocking the light source projected by the light-emitting diode 412, so that the photosensitive tubes 415 generate different high and low level change signals.

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

[0035] Since the valve leaf 40 is at the inner end of the valve body 10, it is impossible to directly observe the position state of the current rotating shaft 410 through the valve body 10 during use. In this solution, a rotary encoder is used to real-time feedback the rotation angle of the rotating shaft 410. The specific principle is as follows:

[0036] A light source is emitted outward through the light-emitting diode 412. The light source is transmitted to the side position of the grating plate 411 through the prism 413. A number 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 positions of each grid are adjusted in real time, and the passing light source is blocked at intervals. The unblocked light source passes through the grating plate 411 and is transmitted to the side of the fixed grating 414, and then transmitted through the fixed grating 414 to the two photosensitive tubes 415. At this time, the high and low level change signals shown by the photosensitive tubes 415 will change due to the change of the rotation angle of the rotating shaft 410. The monitoring personnel can feedback the switch quantity of the current butterfly valve through the final high and low level change signals.

[0037] Please refer to Figure 2 As shown in the figure, the second object of the present invention is to provide a monitoring system for a butterfly valve 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] Among them, the real-time signal acquisition module is used to acquire the motor drive signal under the drive of the motor, the pulse signal shown 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 the vibration feedback signal threshold, compare it with the acquired vibration feedback signal, mark the vibration feedback signal exceeding the vibration feedback signal threshold as an abnormal vibration feedback signal, and vice versa 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 timing range, and divides the end timing range into a stable interval and a fluctuation interval;

[0041] When the end timing range is in the fluctuation interval, analyze by intermittently obtaining the end timing ranges feedback at different time points, and determine whether it is an abnormal fluctuation interval through the signal change amount;

[0042] When the end timing range is in the stable interval, perform stable interval adjustment, adjust to the nearest fluctuation interval, and analyze by intermittently obtaining the end timing ranges feedback at different time points, and determine whether it is an abnormal fluctuation interval through the signal change amount;

[0043] When the two signals of adjacent timing points are not within the same square wave, it indicates that the current end timing range is an abnormal fluctuation interval, and vice versa is a normal fluctuation interval;

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

[0045] During specific use, when the entire butterfly valve vibrates after being impacted by fluid, since it is impossible to determine whether the current vibration is caused by the jitter of the valve leaf 40 or other mechanical vibrations, and if the vibration is caused by the valve leaf 40, the final digital output monitoring will be affected. Therefore, it is necessary to analyze the cause of the vibration in advance;

[0046] To address the above problems, during the specific monitoring process, the motor drive signal driven by the motor, the pulse signal manifested 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. Among them, the motor drive signal is the rotational speed and rotation amount of the motor, and the pulse signal is the high-low level change signal, such as Figure 1 the signal 1 and signal 2 in. Among them, the power supply is the power supply for signal analysis, and the corresponding vibration feedback signal is the vibration feedback signal monitored by the vibration sensor 210 after the overall butterfly valve vibrates, including the jitter generated when the fluid passes through the valve leaf 40 and other mechanical vibrations;

[0047] When there is a gap between the rotating shaft 410 and the valve head 20 after wear, the valve leaf 40 will be jittered after being pushed by the fluid, resulting in an error in the final monitored digital output. At this time, the vibration feedback signal threshold is set through the abnormal signal response module and compared with the collected vibration feedback signal. The vibration feedback signal exceeding the vibration feedback signal threshold is marked as an abnormal vibration feedback signal, and vice versa is marked as a normal vibration feedback signal;

[0048] Since the vibration amounts corresponding to different flow states are different, the corresponding vibration amplitudes will also vary. When setting the vibration feedback signal threshold, the actual flow needs to be considered. The specific setting content is as follows:

[0049] First, combine the cross-sectional size of the pipeline connected to the butterfly valve to obtain the maximum allowable flow at its inner end. The digital output of the butterfly valve controls the size of the flow. For butterfly valves under different digital outputs, if the flow through the pipeline is constant, the smaller the digital output, the greater the corresponding pressure will be. Therefore, during the actual process of setting the vibration feedback signal threshold, through historical simulation data, that is, data verification is carried out on the basis of a qualified valve body to ensure that the fluid volume passing through the pipeline each time is the same, and unit adjustment is carried out within the adjustment range of the valve body digital output. For example, in the adjustment range of 0-90°, the digital output is adjusted by 5° each time, and the vibration generated when the fluid passes through the valve body is obtained in real time through the vibration sensor, and the maximum vibration signal captured under the current digital output condition is marked as the vibration feedback signal threshold. During the actual comparison process, it is necessary to obtain the vibration signal collected in real time, obtain the peak point through the vibration signal waveform diagram, and compare the peak point with the vibration feedback signal threshold to determine whether it exceeds the current threshold.

[0050] After completing the determination of the vibration signal, since external mechanical vibrations 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 analyze and process the current pulse signal by the pulse signal analysis module in response to the abnormal vibration feedback signal, obtain the end timing range, and Figures 3 - 4 As shown, the obtained pulse signal includes three phases, namely the A signal, the B signal, and the Z signal. Because of the angular deviation between the two sets of grids, two sets of A / B signals with a 90° phase deviation will be generated. And for each revolution of the rotary encoder, the Z phase emits only one pulse at a fixed position, so it can be used as the reset phase or the zero phase;

[0051] Since there are forward and reverse rotations during the specific rotation process, and the pulse signal simulation diagrams formed by forward and reverse rotations are different. Therefore, in order to perform subsequent determinations, it is necessary to determine the rotation direction in advance. When rotating clockwise (forward rotation), the A signal leads the B signal by 90° in phase. When rotating counterclockwise (reverse rotation), the B signal leads the A signal by 90° in phase. When the circuit receives the A and B signals of the rotary encoder, it can determine the rotation direction of the encoder according to the state combination of A and B;

[0052] As Figure 1 shown, when the B signal is at a low level at the rising edge of the A signal, or when the B signal is at a high level at the falling edge of the A signal, it proves that the current encoder is rotating clockwise;

[0053] As Figure 2 shown, when the B signal is at a high level at the rising edge of the A signal, or when the B signal is at a low level at the falling edge of the A signal, it proves that the current encoder is rotating counterclockwise;

[0054] Due to different switch degrees, the lengths of the finally collected signals are 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 the vibration frequency and vibration amplitude, the change amount is small at this time. If the same time sequence points collected at different time points are within the same square wave, that is, the corresponding horizontal signal values are the same at this time, it will be difficult to distinguish in the case of a small change amount. Therefore, in the specific monitoring process, it is necessary to divide the end timing range in advance, which is divided into a stable interval and a fluctuation interval, and the division method is as follows:

[0055] First, obtain the waveform diagrams of the A signal and the B signal at different times, and collect the end timing points. As Figure 5 shown, the corresponding end timing point is x1, formulate the unit timing quantity, and obtain the adjacent timing points of the end timing point. As Figure 5As shown, the adjacent timing point of the end timing point x1 is x2, that is, the difference between the two is the unit timing quantity. The range formed by the adjacent timing point and the end timing point is marked as the end timing range. Determine whether the current end timing range belongs to the same square wave. When it belongs to the same square wave, mark the current end timing range as a stable interval. When 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 the fluctuation interval;

[0056] Furthermore, when in the waveform diagrams of signal A and signal B collected at different times, the corresponding end timing ranges all belong to the same stable interval, it indicates that the vibration change amount cannot be directly determined at this time. Therefore, the end timing range needs to be adjusted. The end timing range is related to the switch quantity, and the end timing range can be changed by adjusting the switch quantity. In this solution, to ensure the monitoring accuracy, each adjustment amount is the same, that is, the unit adjustment amount. The unit adjustment amount corresponds to the unit switch quantity. That is, after adjusting the unit switch quantity each time, collect the waveform diagrams of signal A and signal B at different time points and perform the end timing range determination. If they are not in the same square wave at this time, that is, there is a signal difference between them, as Figure 5 shown, the end timing range after adjustment is x3 - x4, corresponding to the fluctuation interval. At this time, if the vibration is caused by the wear of the rotating shaft 410, the change amounts at the two time points are obvious, that is, one up and one down, as Figure 5 shown, in the B signal simulation diagram, the corresponding end timing range is x3 - x4, which has an upper edge interval and a lower edge interval, that is, it indicates that the square waves corresponding to the end timing points at different times may be different, and different square waves represent a large change interval at this time, and it can be immediately judged that the current vibration reason 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, obtain the corresponding adjustment path and determination result through the abnormal switch quantity monitoring module, and predict the switch quantity fluctuation range of the butterfly valve. The specific prediction method is as follows:

[0058] First, obtain the waveform diagrams of signal A and signal B at different time points, and obtain the corresponding signal quantities of each end timing point within the fluctuation interval, that is, the signal quantity belonging to the upper edge position of the square wave is output as 1, and the signal quantity belonging to the lower edge position of the square wave is output as 0. Establish signal sets according to the corresponding signal quantities, that is, the upper edge position signal set and the lower edge position signal set, and obtain the longest end timing point and the shortest end timing point in the signal sets. Here, the length represents the time length. Obtain the timing point range formed by the longest end timing point and the shortest end timing point, and compare it with the unit timing quantity. Calculate the switch quantity fluctuation range = timing point range / unit timing quantity × the switch quantity corresponding to the unit timing quantity.

[0059] Finally, the specific process is as Figure 6As shown, first, an input real-time vibration feedback signal is received, and a threshold determination is made on the vibration feedback signal. When the current vibration feedback signal exceeds the vibration threshold, the output vibration feedback signal is a normal vibration feedback signal; otherwise, a real-time pulse signal is collected, and it is determined whether the current real-time pulse signal belongs to a stable interval;

[0060] If it is not in the stable interval, it means it is in the fluctuation interval. At this time, no switching quantity adjustment is required, and a signal fluctuation determination is directly carried out, that is, the signal quantities corresponding to the end timing points at different time points are 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; otherwise, if the signal quantities corresponding to the end timing points at different time points change, 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 interval, in order to ensure the subsequent monitoring effect, a unit adjustment quantity adjustment is required. After each adjustment, an interval determination needs to be made until the interval is adjusted to the fluctuation interval, and the determination is made according to the above-mentioned determination method for the fluctuation interval.

[0062] The present invention obtains the switching quantity of the butterfly valve in real time through a rotary encoder, and in the specific monitoring process, the pulse signal analysis module responds to the abnormal vibration feedback signal, analyzes and processes the current pulse signal, obtains the end timing range, 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 quantity, changes the signal change quantity range, intuitively reflects the changes of the corresponding timing points in different time states, improves the monitoring accuracy, avoids the monitoring error caused by the stable interval, and at the same time cooperates with the abnormal switching quantity monitoring module to obtain the corresponding adjustment path and determination result, predicts the switching quantity fluctuation range of the butterfly valve, and serves as the 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 of this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention, and do not limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A butterfly valve with switch quantity acquisition, comprising 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 end of the valve body (10). A rotary shaft (410) is coaxially connected between the inner end of the valve head (20) and the side surface of the valve leaf (40). A turntable (30) is arranged on the side surface of the valve head (20), and a connecting drive shaft (310) is coaxially connected to the side surface of the turntable (30). The drive shaft (310) drives the rotary shaft (410) to rotate through meshing gears. A rotary encoder for recording the switch quantity of the valve leaf (40) is connected to the rotary shaft (410), characterized in that: A vibration sensor (210) for vibration monitoring is provided at the inner end of the valve head (20). The rotary encoder includes a grating plate (411) coaxially connected to the rotary shaft (410). A prism (413) is provided on one side of the grating plate (411). A light-emitting diode (412) for providing a light source is provided on the side of the prism (413). 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 on the same horizontal line. A pair of photosensitive tubes (415) are symmetrically provided on the side of the fixed grating (414). A number of grids are arrayed on the side of the grating plate (411). The grating plate (411) rotates synchronously with the rotary shaft (410) to intermittently block the light source projected by the light-emitting diode (412), so that the photosensitive tubes (415) generate different high and low level change signals.

2. A monitoring system for a butterfly valve with switch quantity acquisition as described in claim 1, characterized in that: It includes a real-time signal acquisition module, an abnormal signal response module, a pulse signal analysis module, and an abnormal switch quantity monitoring module; Among them, the real-time signal acquisition module is used to acquire the motor drive signal under the drive of the motor, the pulse signal shown by the photosensitive tubes (415), and the vibration feedback signal fed back by the vibration sensor (210); The abnormal signal response module is used to set the vibration feedback signal threshold, compare it with the acquired vibration feedback signal, mark the vibration feedback signal exceeding the vibration feedback signal threshold as an abnormal vibration feedback signal, and vice versa 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 timing range, and divides the end timing range into a stable interval and a fluctuation interval; When the end timing range is in the fluctuation interval, analyze by intermittently obtaining the end timing ranges fed back at different time points, and determine whether it is an abnormal fluctuation interval through the signal change amount; When the end timing range is in the stable interval, perform a stable interval adjustment, adjust to the nearest fluctuation interval, and intermittently obtain the end timing ranges fed back at different time points for analysis, and determine whether it is an abnormal fluctuation interval through the signal change amount; When the two signals of adjacent timing points are not within the same square wave, it indicates that the current end timing range is an abnormal fluctuation interval, and vice versa is a normal fluctuation interval; The abnormal switch quantity monitoring module obtains the corresponding adjustment path and determination result, and predicts the switch quantity fluctuation range of the butterfly valve.

3. The monitoring system according to claim 2, wherein: The method for setting the vibration feedback signal threshold in the abnormal signal response module includes the following steps: S1. Combine the cross-sectional size of the pipeline connected to the butterfly valve to obtain the maximum flow rate allowed to flow inside it; S2. Through historical simulation data, perform unit adjustment within the valve body switch quantity adjustment range, and obtain the vibration generated by the fluid passing through the valve body in real time through the vibration sensor; S3. Mark the maximum vibration signal captured under the current switch quantity condition as the vibration feedback signal threshold.

4. The monitoring system according to claim 2, wherein: The method for analyzing and processing the pulse signal in the pulse signal analysis module includes the following steps: S10. Determine the rotation direction in advance; When rotating clockwise, the A signal leads the B signal by 90° in phase; When rotating counterclockwise, the B signal leads the A signal by 90° in phase; S20. Determine the rotation direction of the encoder according to the state combination of the A signal and the B signal; When the B signal is at a low level when the A signal rises, or when the B signal is at a high level when the A signal falls, it proves that the current encoder is rotating clockwise; When the B signal is at a high level when the A signal rises, or when the B signal is at a low level when the A signal falls, it proves that the current encoder is rotating counterclockwise.

5. The monitoring system according to claim 4, wherein: The method for dividing the end timing range in the pulse signal analysis module includes the following steps: S30. Obtain the waveform diagrams of the A signal and the B signal at different times, and collect the end timing points; S40. Define the unit timing quantity, and obtain the adjacent timing points of the end timing points; S50. Mark the range formed by the adjacent timing points and the end timing points as the end timing range, and determine whether the current end timing range belongs to the same square wave; When it belongs to the same square wave, mark the current end timing range as a stable interval; When 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.

6. The monitoring system according to claim 5, characterized in that: The method for adjusting the stable interval in the pulse signal analysis module includes the following steps: S60. Adjust the unit adjustment quantity for the end timing range; S70. Collect the waveform diagrams of the A signal and the B signal at different time points, and determine the end timing range; If the signal quantities of the end timing points corresponding to two time points are not in the same square wave, there is a signal difference between them, corresponding to a fluctuation interval; On the contrary, when the signal quantities of the end timing points corresponding to two time points are in the same square wave, there is no signal difference between them, corresponding to a stable interval, then perform a secondary unit adjustment quantity adjustment, and repeat steps S60 and S70 until it is determined as a fluctuation interval.

7. The monitoring system according to claim 6, wherein: The unit adjustment quantity in S60 corresponds to the unit switch quantity.

8. The monitoring system according to claim 2, wherein: The method for predicting the switch quantity fluctuation range of the butterfly valve in the abnormal switch quantity monitoring module includes the following steps: S100. Obtain the waveform diagrams of the A signal and the B signal at different time points, and obtain the corresponding signal quantities of each end timing point within the fluctuation interval; S200. Output the signal quantity belonging to the upper edge position of the square wave as 1, and output the signal quantity belonging to the lower edge position of the square wave as 0, and establish signal sets according to the corresponding signal quantities respectively; S300. Obtain the longest end timing point and the shortest end timing point in the signal set, and obtain the timing point range formed by the longest end timing point and the shortest end timing point; S400. Compare the timing point range formed by the longest end timing point and the shortest end timing point with the unit timing quantity, and calculate the switch quantity fluctuation range = timing point range / unit timing quantity × the switch quantity corresponding to the unit timing quantity.

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