Method and device for determining the position of a stuck valve in a diaphragm pump

Abstract

The present application belongs to the technical field of valve detection, and particularly relates to a method and equipment for judging the valve jamming vibration position of a diaphragm pump, S1, determining the detection position on the check valve as the upper part of the check valve according to the characteristics of sound transmission; S2, calculating the maximum deflection angle of the check valve as a°; S3, check valve jamming judgment: on the upper part of the check valve, the contact position of the top spring and the metal is on the diagonal line of the valve box body, respectively using the detection equipment to listen, if the spring has no vibration sound or is dull, it is judged that the check valve is jammed; if the metal harsh sound of the spring cannot be heard on any diagonal line, it is judged that the check valve is completely jammed. Using the method to determine the check valve jamming, the valve jamming position can be quickly determined, the inspection and maintenance cost is reduced, the external discharge output is increased, and the equipment operation rate is improved.

Description

Technical Field

[0001] This invention belongs to the field of valve jamming detection technology, and in particular relates to a method and device for determining the vibration position of a diaphragm pump valve jamming. Background Technology

[0002] In alumina production, red mud is pumped into the discharge pipeline using a reciprocating three-cylinder single-acting diaphragm pump. Each diaphragm pump corresponds to six check valves. After discharge, the red mud enters the red mud filter press workshop, where it is filtered and then discharged into the stockpile. During the operation of the diaphragm pumps, the entry of red mud debris and other impurities causes the check valves to frequently jam. Because operators are unclear about the principles and methods for identifying check valve jamming, the workload for maintenance and cleaning is large, extending the check valve cleaning cycle and increasing maintenance costs. Furthermore, the extended maintenance time also causes fluctuations, affecting the flow rate of the liquid.

[0003] Currently, there is no equipment or method for determining the position of stuck valves in red mud discharge diaphragm pumps. Operators are unfamiliar with the principle and determination method of stuck check valves. When a valve is stuck, all check valves are always disassembled, inspected, and cleaned. Each disassembly and inspection of 6 check valves takes about 1 hour. Frequent and prolonged valve sticking increases the cleaning workload and maintenance costs, while also causing a decrease in red mud discharge output, insufficient wash water supply, and an increase in the final NT (alumina content). In addition, the long cleaning time shortens the diaphragm pump's operating rate. Summary of the Invention

[0004] To address the technical problems existing in the background art, the present invention provides a method and equipment for determining the vibration position of a diaphragm pump stuck valve. Using this method to determine the stuck valve position of a one-way valve can quickly determine the stuck valve position, reduce maintenance costs, increase output, and improve equipment operating rate.

[0005] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0006] A method for determining the vibration location of a diaphragm pump stuck valve includes the following steps:

[0007] S1. The detection position on the check valve is determined based on the characteristics of sound transmission: the lower part of the check valve is sealed by the valve rubber and the valve seat, and the sound transmission medium is colloid; the upper part of the check valve is sealed by the spring, the valve cover and the valve box body, and the sound transmission medium is metal. The detection position is determined to be the upper part of the check valve based on the characteristics of sound transmission.

[0008] S2, calculate the maximum offset angle of the check valve as a°: Measure and calculate the check valve. When the valve cone is open, the height of the contact surface between the valve cone angle and the valve seat is recorded as H, the gap between the valve cone angle and the valve seat is recorded as d1, the maximum offset distance on one side is 2d1, the gap between the guide sleeve and the guide rod is recorded as d2, and the maximum offset distance on one side is 2d2. Determine the magnitudes of 2d1 and 2d2. During operation, the smaller value is taken as the maximum offset distance. Calculate the maximum offset angle a° of the check valve using trigonometric functions.

[0009] S3, Check valve stuck: At the top of the check valve, on any diagonal line of the valve body where the top spring contacts the metal, use a testing device to listen. If the spring makes no vibration or a dull sound, the check valve is stuck. If no metallic sound is heard from the spring on any diagonal line, the check valve is completely stuck.

[0010] The present invention has the following advantages and beneficial effects:

[0011] Using this method to determine the stuck position of a one-way valve can quickly identify the stuck position, reduce maintenance costs, increase output, and improve equipment operating rate.

[0012] (1) It can quickly determine the position of the stuck valve and quickly identify the stuck valve among several check valves of a single diaphragm pump. It can be detected at any angle and the measuring tools are diversified.

[0013] (2) This method can be mastered quickly and has an accuracy rate of 100%;

[0014] (3) Based on the cost of disassembling and inspecting each check valve at 260 yuan, the annual maintenance and cleaning costs can be saved by about 350,000 yuan.

[0015] (4) The maintenance time has been shortened from 1 hour to 20 minutes, avoiding over-maintenance and incorrect maintenance, greatly reducing the labor intensity of maintenance and cleaning, and improving the equipment operating rate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the one-way valve provided by the present invention;

[0017] Figure 2 for Figure 1 A magnified view of a portion of point a.

[0018] Figure 3 This is a schematic diagram illustrating the calculation principle of the maximum deflection angle α of a one-way valve.

[0019] Figure 4 A measurement schematic diagram of the one-way valve and measuring device provided by the present invention;

[0020] Figure 5 for Figure 4A cross-sectional view along the AA direction;

[0021] Figure 6 for Figure 5 A magnified view of a section at point b in the middle;

[0022] Figure 7 for Figure 5 A magnified view of a section at point c in the middle;

[0023] Figure 8 A cross-sectional view of the measuring device provided by the present invention;

[0024] Figure 9 for Figure 8 A magnified view of a portion at point d in the middle;

[0025] Figure 10 for Figure 8 A magnified view of a section at point e in the middle;

[0026] Figure 11 for Figure 4 A magnified view of a portion at point f.

[0027] Figure 12 The pipeline connection structure diagram provided by the present invention;

[0028] Figure 13 A schematic diagram showing a support frame mounted on the measuring device provided by the present invention;

[0029] Figure 14 A schematic diagram of the support frame provided by the present invention;

[0030] Icons: 1-Valve housing, 11-Valve cover, 12-Guide sleeve, 13-Valve seat, 2-Guide rod, 21-Spring 1, 3-Valve nut, 31-Valve rubber, 32-Valve cone, 33-Valve cone angle, 4-Retaining ring, 4a-Gap, 41-Fixing hole, 42-Air passage 1, 43-Mounting groove, 44-Air passage 2, 5-Air tank, 51-Air outlet connector, 52-Fixing seat, 53-Air passage 3, 54-Support plate, 55-Lock 6-Tightening screw, 6-Detector, 61-Piston assembly, 62-Spring 2, 7-Airbag, 8-Main pipe, 81-Pressure gauge, 82-Relief valve 1, 83-Branch 1, 84-Branch 2, 85-Branch 3, 86-Check valve, 87-Relief valve 2, 88-Branch 4, 89-Branch 5, 9-Support frame, 91-Hinge seat, 92-Support rod, 921-Slide rod, 93-Positioning block, 94-Spring, 95-Nut. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0032] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0033] Example

[0034] like Figure 1 The diagram shown is a structural schematic of a check valve for a diaphragm pump. The check valve includes components such as: valve housing 1, valve cover 11, guide sleeve 12, valve seat 13, guide rod 2, spring 21, valve nut 3, valve rubber 31, valve cone 32, and valve cone angle 33.

[0035] In alumina production, red mud is discharged into the discharge pipeline using a reciprocating three-cylinder single-acting diaphragm pump. Each diaphragm pump corresponds to 6 check valves. When a valve gets stuck, it is necessary to accurately determine which check valve is stuck.

[0036] This invention addresses the problem of difficulty in determining the position of a stuck valve in existing technologies by proposing a method for determining the vibration position of a stuck valve in a diaphragm pump, comprising the following steps:

[0037] S1. Based on the characteristics of sound transmission, the detection position on the check valve is determined: The lower part of the check valve is sealed by the valve rubber 31 and valve seat 13, where the sound transmission medium is a colloid, and the sound transmission is not obvious; the upper part of the check valve is sealed by the spring 21, valve cover 11, and valve box 1, where the sound transmission medium is metal, and the sound transmission is obvious. Therefore, the detection position is determined to be the upper part of the check valve based on the characteristics of sound transmission.

[0038] Sound travels at different speeds and propagates in different media, depending on the medium's density, elasticity, and viscosity. Colloids are media with relatively low density and elasticity, so sound travels slowly in them. Furthermore, due to their high viscosity, sound waves may experience damping and attenuation during propagation, resulting in minimal transmission. Metals, on the other hand, are media with high density and elasticity, so sound travels quickly in them. Moreover, due to their good electrical and thermal conductivity, sound waves encounter minimal obstruction during propagation, resulting in significant transmission. Therefore, we can say that the effectiveness of sound transmission in different media depends on the medium's density, elasticity, and viscosity.

[0039] S2, calculate the maximum offset angle of the check valve as a°: Measure and calculate the check valve. When the valve cone 32 is open, the contact height between the valve cone angle 33 and the valve seat 13 is recorded as H, the gap between the valve cone angle 33 and the valve seat 13 is recorded as d1, and the maximum offset distance on one side is 2d1. The gap between the guide sleeve 12 and the guide rod 2 is recorded as d2, and the maximum offset distance on one side is 2d2. Determine the magnitudes of 2d1 and 2d2. During operation, the smaller value is taken as the maximum offset distance of the check valve. Calculate the maximum offset angle a° of the check valve using trigonometric functions.

[0040] Specifically:

[0041] The one-way valve was measured and calculated. When the valve cone 32 is fully open, its stroke height is about 24mm. When the valve cone 32 is open, the contact height H between the valve cone angle 33 and the valve seat 13 is 43mm.

[0042] like Figure 2 and Figure 3 As shown, by calculating the distances between the valve cone angle 33 and the valve seat 13, the total distance 2d1 is 2.2 mm, while the total distance 2d2 between the guide sleeve 12 and the guide rod 24 is 21 mm. The smaller value, 2.2 mm, is taken as the maximum offset distance during operation of the check valve. Therefore, using trigonometric functions, the maximum offset angle of the check valve can be calculated to be 3°.

[0043] S3, Check Valve Jam Detection: At the upper part of the check valve, on any diagonal line of valve housing 1 where the top spring contacts the metal (e.g., ...). Figure 1 Points A and A' in the diagram are used to listen with a testing device. If the spring makes no vibration or a dull sound, it is determined that the one-way valve is stuck. If no metallic sound is heard from the spring on any diagonal, it is determined that the one-way valve is completely stuck.

[0044] Specifically, you can test the valve body by placing one hand over one ear and using a stethoscope, pen, or stick against the other ear at any diagonal point A and A' near the top where the spring contacts the metal. If you hear no vibration or a dull sound from the spring, the check valve is stuck. If you hear no metallic sound from the spring at any diagonal point, the check valve is completely stuck.

[0045] S4. When the material is viscous, the position of the stuck valve should be checked and determined after switching to water. The diaphragm pump normally transports mud (red mud), but water should be switched to flush the pipe before checking the stuck valve. Therefore, when the material is viscous, water can be passed through first and then the test can be performed.

[0046] When the check valve is stuck, the angle of the check valve shifts (due to foreign matter between the valve cone 32, valve rubber 31 and valve seat 13, or between the guide rod 2, spring 21 and guide sleeve 12, causing the valve rubber 31 to not fully fit with the valve seat 13). At this time, since the valve cone 32 and valve rubber 31 are circular, as long as any angle changes, the contact surface between the valve rubber 31 and the valve seat 13 is only a point (considering the slight compression deformation of the valve rubber 31, the contact surface is less than 1 / 4 of the entire circle). That is, the distance the spring 21 at the top of the same position springs out diagonally becomes smaller, and the sound of metal popping up is dull. When the check valve is completely stuck, the valve cone 32 is raised as a whole. Due to foreign matter entering the guide sleeve 12, the guide rod 2, guide sleeve 12 and spring 21 are bonded together. At this time, there will be no harsh metallic sound of spring 21 compressing and popping up in any direction.

[0047] The above method can accurately identify the stuck check valve. However, in order to further improve the accuracy of the detection, further design is needed to achieve automated valve stuck detection.

[0048] like Figure 4-12 As shown, a device for determining the vibration position of a diaphragm pump valve includes a fixing ring 4, an air bladder 7, and a detector 6. The inner diameter of the fixing ring 4 is larger than the outer wall of the valve housing 1, meaning that after the fixing ring 4 is installed, there is a gap 4a between the fixing ring 4 and the valve housing 1. Two annular mounting grooves 43 are provided on the inner wall of the fixing ring 4 at fixed distances. The notch angle on the cross-section of the mounting groove 43 is denoted as b, and is less than 150°. An air bladder 7 is installed inside the mounting groove 43, and the air bladder 7 is connected to an inflation device. A second air passage 44 is provided on the outer wall of the fixing ring 4, and a flexible hose is installed inside the second air passage 44, which is connected to the air bladder 7.

[0049] With this design, after the airbag 7 is inserted into the mounting groove 43, a slight increase in air will keep the airbag 7 within the mounting groove 43, preventing it from falling out. At the same time, when the airbag 7 is fully inflated, it is also completely contained within the mounting groove 43, with only a portion of the airbag 7 protruding through the notch in the mounting groove 43 and adhering to the outer wall of the valve box 1.

[0050] Secondly, the use of airbag 7 for fixing can minimize the impact of vibration. The fixing ring 4 is fixed to the outer wall of the valve box 1 by airbag 7. Since airbag 7 has the characteristics of being lightweight, soft, low stiffness, and having a large contact area, it can minimize the absorption or reflection of the vibration energy of the valve box 1.

[0051] Lightweight: The smaller the mass of the object in contact, the weaker the ability to absorb or reflect vibrational energy, thus reducing the impact on valve body vibration.

[0052] Softness: Soft objects can better absorb vibrational energy and reduce reflection.

[0053] Low stiffness: The lower the stiffness of the contacting object, the less impact it has on valve body vibration. Choosing low-stiffness materials or structures, such as elastic supports or damping devices, can reduce vibration transmission.

[0054] Large contact area: Increasing the contact area can disperse vibration energy and reduce the impact on the valve body.

[0055] In other words, by using a double airbag 7 for fixation, the impact on valve body vibration can be minimized, thus allowing for accurate measurement via the detector 6.

[0056] Two fixing holes 41 are symmetrically arranged on the inner wall of the center of the fixing ring 4. An air passage 42 is provided in each fixing hole 41, which is located between two mounting slots 43. A detector 6 is slidably mounted in each fixing hole 41. A piston assembly 61 is mounted on the outer wall of the detector 6. The inner wall of the fixing hole 41 and the detector 6 are connected by a spring 62; one end of the spring 62 is fixed in the fixing hole 41, and the other end is connected to the detector 6. Initially, the detector 6 is fully or partially housed in the fixing hole 41. The piston assembly 61 slides tightly against the fixing hole 41. The inflation device is connected to the air passage 42 via a pipe.

[0057] The inflation device can inflate. When the inflation device inflates, the airbag 7 gradually expands. First, it expands and adheres to the outer wall of the valve box 1. When the airbag 7 expands to its maximum position, it is set tightly against the outer wall of the valve box 1, thereby fixing the fixing ring 4 to the outer wall of the valve box 1. At the same time, when the inflation device inflates, it pushes the piston assembly 61 to move, thereby causing the detector 6 to move (at this time, the second spring 62 is stretched) and set tightly against the outer wall of the valve box 1, so as to measure the vibration on the valve box 1.

[0058] In a preferred embodiment of the present invention, the detector 6 is a vibration sensor, which is used for signal acquisition and converts the vibration signal of the spring into an electrical signal. The vibration sensor can be an acceleration sensor, a velocity sensor, or a displacement sensor, etc., and the specific selection depends on the vibration parameters to be measured.

[0059] The detector 6 is electrically connected to the signal acquisition device, which is used to convert electrical signals into digital signals and to sample and store them. The signal acquisition device can be a data acquisition card, a vibration measuring instrument, or other specialized equipment. This device is responsible for converting electrical signals into digital signals and sampling and storing them.

[0060] The signal acquisition equipment and data processing and analysis software are electrically connected, allowing the software to process the data and present the results as graphs. Commonly used software includes MATLAB, LabVIEW, and Python. It can perform filtering, spectral analysis, and time-domain analysis on vibration signals, and present the results as graphs.

[0061] Plotting curves: In data processing and analysis software, appropriate plotting functions or tools can be selected to plot the processed vibration signal data as curves. Curves typically use time as the horizontal axis and the amplitude of the vibration signal as the vertical axis, allowing for a direct observation of the vibration signal's changing trend and frequency components.

[0062] By following the steps above, the vibration signal can be directly displayed on the computer screen as a curve, making it convenient to observe and analyze changes in vibration frequency.

[0063] As another preferred embodiment of the invention, the detector 6 is a recording device (such as a microphone) used to capture the sound generated by the spring vibration.

[0064] The recording device and the audio conversion device are electrically connected to convert sound signals into digital signals.

[0065] The audio conversion device connects to the sound analysis software, which performs frequency analysis on the converted digital signal, converts the sound signal into a spectrogram, and extracts the vibration frequencies from the spectrogram. Commonly used sound analysis software includes MATLAB, Audacity, and Adobe Audio.

[0066] Frequency Analysis: Use the spectrum analysis tool in the audio analysis software to perform frequency analysis on the recorded audio signal. The spectrum analysis tool can convert the audio signal into a spectrum graph, displaying the energy distribution of each frequency component in the audio signal.

[0067] It is important to note that when recording the vibration sound of the spring, interference from other environmental noises should be minimized to ensure that the recorded sound signal is clear and reliable. In this invention, the airbag 7 serves to fix the fixing ring 4 while isolating it from the outside environment. The recording device is located inside the fixing ring 4, which can isolate external noise and thus ensure that the recorded sound signal is clear and reliable.

[0068] In summary, by measuring vibration and frequency using detector 6, the sound can be characterized using vibration frequency parameters. When spring 21 is compressed, the vibration frequency decreases due to the conversion of elastic potential energy, resulting in a duller sound. Conversely, when spring 21 is not compressed, the vibration frequency is higher, producing a crisper and louder sound. Therefore, by measuring parameters such as vibration frequency, the degree of spring compression can be determined, enabling automated valve detection.

[0069] To further enhance the fixing effect and prevent the detector 6 from being damaged by friction during installation, further optimized design was made.

[0070] like Figure 12 As shown, the device for determining the vibration position of a diaphragm pump stuck valve according to the present invention includes an external pipeline, which includes a main pipe 8. A pressure gauge 81 and a pressure relief valve 82 are connected sequentially to the main pipe 8. A branch pipe 83 and a branch pipe 84 are connected to the end of the main pipe 8. The branch pipe 83 and the branch pipe 84 are respectively connected to two airbags 7. A branch pipe 85 is connected to the branch pipe 84. A one-way valve 86 and a pressure relief valve 87 are connected sequentially to the branch pipe 85. A branch pipe 88 and a branch pipe 89 are connected to the end of the branch pipe 85. The branch pipe 88 and the branch pipe 89 are respectively connected to two detectors 6.

[0071] In this invention, the opening pressure of the one-way valve 86 is denoted as P1, and the pressure on the pressure gauge 81 is denoted as Px. When Px gradually increases and becomes less than P1, the air bladder 7 expands and adheres to the outer wall of the valve housing 1. That is, a setting needs to be made so that as Px gradually increases and approaches P1, the air bladder 7 expands and adheres to the outer wall of the valve housing 1. In this case, the mounting ring can be moved. Because the air bladder 7 has a certain frictional force, the fixing ring 4 can be initially fixed to the outer wall of the valve housing 1. Furthermore, the air bladder 7 is elastic, so the fixing ring 4 can be slid to adjust its position, allowing the detector 6 to reach the accurate detection position (points A and A').

[0072] After the fixed ring 4 is slidably adjusted to its position, inflation continues until Px is greater than P1. At this point, the airbag 7 continues to expand and is tightly fixed to the outer wall of the valve box 1. In this case, the airbag 7 is fully expanded, making it firmly attached to the outer wall of the valve box 1. At this time, the fixed ring 4 cannot be slid to adjust its position, and the fixed ring 4 is completely fixed. At the same time, the one-way valve 86 is pushed open due to the high pressure, and gas rushes in, pushing the piston assembly 61 and the detector 6 to slide out from the fixing hole 41 and stick tightly to the outer wall of the valve box 1, thereby meeting the measurement conditions.

[0073] In other words, by using the above method, the fixing ring 4 can be initially fixed and its position can be adjusted; then, the measuring instrument 6 can be extended and pressed against the outer wall of the valve box 1 for measurement. In this way, the fixing ring 4 will not wear down the measuring instrument 6. The measuring instrument 6 will only extend from the fixing hole 41 when it reaches the detection position. This fixing method makes the position easy to adjust, and the installation of the measuring instrument 6 is convenient and quick, and the data detection is accurate.

[0074] After the measurement is completed, first open the pressure relief valve 87 to release the air. The detector 6 will be reset by the action of the spring 62 and retract into the fixing hole 41. Then open the pressure relief valve 82 to release the pressure to less than P1, or completely release the pressure, and then the fixing ring 4 can be removed.

[0075] In this invention, the inflation device is an air tank 5, which has an air outlet connector 51. A fixing seat 52 is located at the other end of the air tank 5, and a support plate 54 is located at one end of the fixing seat 52. The support plate 54 is fitted tightly against the outer wall of the fixing ring 4, and the support plate 54 and the fixing ring 4 are fixedly connected by locking screws 55. An air passage 3 53 is provided inside the fixing seat 52, and the air passage 3 53 communicates with one of the fixing holes 41. One end of the main pipe 8 is connected to the air outlet connector 51 of the air tank 5.

[0076] Furthermore, an optimized design was made to facilitate the installation of the fixing ring 4.

[0077] like Figure 13 As shown, several hinge seats 91 are fixed to the outer wall of the fixed ring 4, and an L-shaped support frame 9 is hinged to the hinge seat 91.

[0078] like Figure 14 As shown, preferably, the support frame 9 can be a telescopic multi-segment design. It includes a positioning block 93 and a support rod 92. The upper end of the support rod 92 extends to a slide rod 921. The positioning block 93 is provided with a sliding hole. The positioning block 93 is slidably mounted on the slide rod 921. A spring 94 is sleeved on the upper end of the slide rod 921. A nut 95 is provided on the upper end of the slide rod 921. One end of the spring 94 is tightly attached to the nut 95, and the other end is tightly attached to the positioning block 93.

[0079] When installing the retaining ring 4, rotate the support frame 9 to the position shown. Figure 13 As shown, the upper end of the support frame 9 is engaged with the upper surface of the valve cover 11, thereby suspending the fixing ring 4 entirely on the outer wall of the valve body 1. Then, the inflation device inflates, causing the airbag 7 to expand and provide initial force, making the airbag 7 adhere to the outer wall of the valve body 1.

[0080] Then, slide the fixing ring 4 to adjust its position so that the detector 6 reaches the detection position (points A and A'). At the same time, the fixing ring 4 moves downward, causing the slide rod 921 to slide down, and the spring 94 is compressed. After adjustment, continue inflation until the airbag 7 fully inflates, completely fixing the fixing ring 4 and making the detector 6 fit against the outer wall of the valve box 1. After fixing, pull the positioning block 93 upward and rotate the whole thing to disengage it from the valve cover 11, that is, to release the contact between the support frame 9 and the valve cover 11, ensuring the accuracy of the detection data. Then the detection can begin.

[0081] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for determining the vibration position of a diaphragm pump stuck valve, characterized in that, Includes the following steps: S1. The detection position on the check valve is determined based on the characteristics of sound transmission: the lower part of the check valve is sealed by the valve rubber and the valve seat, and the sound transmission medium is colloid; the upper part of the check valve is sealed by the spring, the valve cover and the valve box body, and the sound transmission medium is metal. The detection position is determined to be the upper part of the check valve based on the characteristics of sound transmission. S2, calculate the maximum offset angle of the check valve as a°: Measure and calculate the check valve. When the valve cone is open, the height of the contact surface between the valve cone angle and the valve seat is recorded as H, the gap between the valve cone angle and the valve seat is recorded as d1, the maximum offset distance on one side is 2d1, the gap between the guide sleeve and the guide rod is recorded as d2, and the maximum offset distance on one side is 2d2. Determine the magnitudes of 2d1 and 2d2. During operation, the smaller value is taken as the maximum offset distance. Calculate the maximum offset angle a° of the check valve using trigonometric functions. S3, Check valve stuck: At the top of the check valve, on any diagonal line of the valve body where the top spring contacts the metal, use a testing device to listen. If the spring makes no vibration or a dull sound, the check valve is stuck. If no metallic sound is heard from the spring on any diagonal line, the check valve is completely stuck.

2. The method for determining the vibration position of a diaphragm pump stuck valve according to claim 1, characterized in that: When the material is viscous, the position of the valve is detected and determined after the water is turned into water.

3. An apparatus for detecting the vibration position of a diaphragm pump stuck valve using the method of any one of claims 1 or 2, characterized in that: The device includes a fixing ring, an airbag, and a detector. The inner diameter of the fixing ring is larger than the outer wall of the valve box. The inner wall of the fixing ring is provided with two annular mounting grooves at a fixed distance. The notch angle on the cross section of the mounting groove is denoted as b and is less than 150°. An airbag is provided in the mounting groove and is connected to an inflation device. The inner wall of the fixed ring is symmetrically provided with two fixing holes, and a detector is fixed in each fixing hole. A piston assembly is provided on the outer wall of the detector. The inner wall of the fixing hole and the detector are connected by a spring. Initially, the detector is housed in the fixing hole; the piston assembly slides close to the fixing hole; the inflation device is connected to the fixing hole. The inflation device can inflate, thereby causing the airbag to expand and fit tightly against the outer wall of the valve box, and causing the detector to move and fit tightly against the outer wall of the valve box.

4. The apparatus according to claim 3, characterized in that: The detector is a vibration sensor, which is used for signal acquisition and converts the vibration signal of the spring into an electrical signal. The detector and the signal acquisition device are electrically connected. The signal acquisition device is used to convert the electrical signal into a digital signal and to sample and store it. The signal acquisition device and the data processing and analysis software are electrically connected, and the data processing and analysis software performs data processing and presents the results in the form of a graph.

5. The apparatus according to claim 3, characterized in that: The detector is a recording device used to capture the sound generated by the spring vibration; The recording device and the audio conversion device are electrically connected and are used to convert sound signals into digital signals; The audio conversion device is connected to the sound analysis software, which is used to perform frequency analysis on the converted digital signal, convert the sound signal into a spectrum, and extract the vibration frequency based on the spectrum.

6. The apparatus according to claim 3, characterized in that: The system includes an external pipeline, which includes a main pipe connected to a pressure gauge and a pressure relief valve 1 in sequence. The main pipe is connected to two branch pipes, one and two, which are respectively connected to two airbags. Branch pipe 3 is connected to branch pipe 2, which is connected to a check valve and a pressure relief valve 2 in sequence. Branch pipe 4 and branch pipe 5 are connected to the end of branch pipe 3, which are respectively connected to two detectors.

7. The apparatus according to claim 6, characterized in that: The opening pressure of the one-way valve is denoted as P1, and the pressure on the pressure gauge is denoted as Px. When Px gradually increases and becomes less than P1, the air bladder expands and adheres to the outer wall of the valve box. When Px is greater than P1, the air bladder continues to expand and adheres tightly to the outer wall of the valve box, and the detector gradually extends out and adheres tightly to the outer wall of the valve box.

8. The apparatus according to claim 6, characterized in that: The inflation device is an air tank, which is fixed on the outer wall of the fixing ring, and one end of the main pipe is connected to the air tank.

9. The apparatus according to claim 6, characterized in that: The outer wall of the fixed ring is fixed with several hinge seats, and an L-shaped support frame is hinged to the hinge seats.

10. The apparatus according to claim 9, characterized in that: The support frame includes a positioning block and a support rod. A sliding rod extends from the upper end of the support rod, and the positioning block is slidably mounted on the sliding rod. A nut is provided at the upper end of the sliding rod, and a spring is sleeved on the sliding rod between the nut and the positioning block.

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