A control system and control method for detecting mud level by using the operating current of a sludge scraper

Abstract

The present invention belongs to the technical field of sewage treatment, and discloses a control system and a control method for detecting the mud level by using the operating current of a sludge scraper. The control system includes: a first current transformer is installed on the three-phase incoming line side of the sludge scraper motor power distribution cabinet, and is used to feedback current data to the PLC analog input module through a hard wire and then feedback to the PLC automatic control system; the second current transformer feeds the detected current signal to the PLC analog input module through a hard wire and then feedback to the PLC automatic control system; the operation signal output end of the sludge scraper frequency converter is connected to the PLC analog input module to feed data back to the PLC automatic control system for current data transmission feedback from the sludge scraper frequency converter to the PLC. The present invention combines the comprehensive analysis of the influent water quality, the instantaneous influent flow rate, the sludge return ratio, and the effluent water quality, intelligently switches the priority of the sludge discharge conditions, controls the sludge layer thickness within a reasonable range, and ensures that the effluent water quality meets the standards.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and particularly relates to a control system and a control method for detecting the mud level by using the operating current of a sludge scraper. Background Technique

[0002] In a coagulation sedimentation tank, coagulants and flocculants are added to water to make the particles difficult to precipitate in the water aggregate with each other to form colloids, and then combine with impurities in the water body to form larger flocs. The flocs have a strong adsorption capacity and can adsorb suspended substances, some bacteria and dissolved substances. The flocs sink due to the increase in volume through adsorption, forming a mud layer. Accurately detecting the thickness of the mud layer and formulating a reasonable sludge discharge cycle are the key factors for the correct operation of the coagulation sedimentation tank, which can achieve efficient working conditions of meeting water quality standards, saving water and chemicals. The control method for the mud layer thickness in the coagulation sedimentation tank uses three conditions, namely the cumulative sludge return flow, the mud level gauge, and the cumulative operating time, as the judgment conditions for immediate sludge discharge when the mud layer is too thick. In actual operation, one of them can be selected to control the sludge discharge. When the set sludge discharge time or the set low mud level value is reached, it is the judgment condition for the termination of sludge discharge.

[0003] Through the above analysis, the problems and defects of the existing technology are as follows: Due to the extremely unstable influent flow of the sewage treatment plant and the large variation in the water quality of industrial parks, the three sludge discharge methods need to be manually selected, resulting in a large variation in the mud layer thickness. In actual operation, none of the above three sludge discharge judgment conditions can accurately reflect the mud layer thickness. Therefore, the accuracy of judging the mud layer thickness in the existing technology is poor. Moreover, the priority of intelligent switching of sludge discharge conditions has a poor effect on controlling the mud layer thickness within a reasonable range and cannot ensure that the effluent water quality meets the standards. Summary of the Invention

[0004] To overcome the problems existing in the related technology, the disclosed embodiments of the present invention provide a control system and a control method for detecting the mud level by using the operating current of a sludge scraper.

[0005] The technical solution is as follows: A control system for detecting the mud level by using the operating current of a sludge scraper includes:

[0006] A first current transformer, installed on the three-phase incoming line side of the sludge scraper motor distribution cabinet, for feeding back current data to the PLC analog input module through a hard wire and then to the PLC automatic control system;

[0007] A second current transformer, installed on the power supply side of the sludge scraper, feeding back the detected current signal to the PLC analog input module through a hard wire and then to the PLC automatic control system; changing the output selection port of the sludge scraper frequency converter motor operating frequency data to the motor operating current data output;

[0008] The sludge scraper frequency converter has its operating signal output terminal connected to the PLC analog input module to feed back data to the PLC automatic control system for current data transmission feedback from the sludge scraper frequency converter to the PLC.

[0009] In one embodiment, the control system for detecting the mud level using the operating current of the sludge scraper further includes a mud level gauge for measuring the thickness of the mud layer.

[0010] Another object of the present invention is to provide a control method for detecting the mud level using the operating current of the sludge scraper, which includes the following steps:

[0011] S1. The first current transformer added on the three-phase incoming line side of the sludge scraper motor feeds back the current data to the PLC analog input module and then to the PLC automatic control system for current data transmission feedback.

[0012] S2. The second current transformer installed on the incoming line side of the sludge scraper feeds back the detected current signal to the PLC analog input module through a hard wire and then to the PLC automatic control system; the motor running frequency data output selection port of the sludge scraper frequency converter is changed to the motor running current data output, and the operating signal output terminal of the sludge scraper frequency converter is connected to the PLC analog input module to feed back the data to the PLC automatic control system for current data transmission feedback from the sludge scraper frequency converter to the PLC; current transformers are installed at two different positions to compare the magnitudes of the two feedback currents in the program. When the difference between the two is greater than 30%, it indicates a fault in the induction device and an alarm will be issued; the purpose is to ensure the authenticity and stability of the feedback current, and a reminder of the induction device fault can also be made through the comparison in the automatic control program.

[0013] S3. The PLC automatic control system performs periodic sampling on the incoming line current detected by the first current transformer and the motor running current fed back by the sludge scraper frequency converter, calculates the weighted average value (weighted average algorithm, the purpose is to obtain the average current value within a time period to avoid the influence on the control system caused by data distortion due to unstable signal transmission), retains the measurement data and makes a comprehensive judgment on the mud layer thickness in combination with the mud level gauge.

[0014] In one embodiment, in step S3, the fed-back motor running current is sampled with a 200 - millisecond period, and the weighted average value for 10 seconds is calculated.

[0015] In one embodiment, in step S3, the weight ratio of the two groups of data samples is 50% for the current measured by the current transformer and 50% for the current fed back by the sludge scraper frequency converter.

[0016] In one embodiment, the control method for detecting the mud level using the operating current of the sludge scraper further includes:

[0017] The automatic sludge level sludge discharge process, the sludge discharge process at intervals, the automatic sludge discharge process based on the cumulative flow of the sludge return pump, and the automatic sludge discharge process based on the feedback current are optimized and integrated into an overall intelligent sludge discharge control program. The priorities of various sludge discharge methods are set, and multiple sludge discharge methods are used to jointly control the sludge discharge.

[0018] In the present invention, the current feedback process is only one of the methods for judging the actual sludge level. Four sludge discharge methods, namely current feedback sludge discharge, sludge level gauge sludge discharge, sludge discharge at intervals, and sludge discharge based on the cumulative time of the return pump, can be selectively used according to different process requirements through system settings. For example, when the sludge discharge at intervals is prioritized, the sludge discharge pump will start after reaching the interval time or when the feedback current or the sludge level gauge feedback indicates a high-high alarm.

[0019] In one embodiment, the automatic sludge level sludge discharge process includes: when the sludge level value feedback by the sludge level gauge is greater than the set high sludge level value, the corresponding surplus sludge pump is started for the sludge discharge process, and the frequency of the sludge discharge pump is set to 40 Hz; when the sludge level value feedback by the sludge level gauge is less than the set low sludge level value, the corresponding surplus sludge pump stops discharging sludge for the sludge cultivation process; when the sludge level is in the high sludge level state and the sludge discharge pump has been automatically opened for 20 minutes in the set high sludge level state, the frequency of the surplus sludge pump is increased to the high frequency set value of 50 Hz. If it is in the high frequency state and the sludge level is still at the high sludge level set value for more than 20 minutes, an alarm is given on the upper computer interface.

[0020] In one embodiment, the automatic sludge discharge based on the feedback current includes: when the current value obtained after weighted calculation of the feedback is greater than the set high current value, the corresponding surplus sludge pump is started for the sludge discharge process, and the frequency of the sludge discharge pump is set to 40 Hz; when the feedback current value is less than the set low current value, the corresponding surplus sludge pump stops discharging sludge for the sludge cultivation process; when the feedback current value is in the high current value state and the sludge discharge pump has been automatically opened for 20 minutes in the set high current value state, the frequency of the surplus sludge pump is increased to the high frequency set value of 50 Hz. If it is in the high frequency state and the sludge level is still at the high current set value for more than 20 minutes, an alarm is given on the upper computer interface.

[0021] In one embodiment, the sludge discharge process at intervals includes: when the single cumulative running time of the system reaches the set value, the automatic sludge discharge process of the sludge discharge pump is executed, that is, the sludge discharge pump is started and the single cumulative running time of sludge discharge is timed. When the single cumulative running time of sludge discharge reaches the set value, the automatic sludge discharge process of the sludge discharge pump is stopped, that is, the sludge discharge pump is stopped, the single cumulative running time of sludge discharge is cleared, the single running time of the system is cleared and the timing starts;

[0022] The automatic sludge discharge process based on the cumulative flow of the sludge return pump includes: when the cumulative flow of a single water intake of the system reaches the set value, the automatic sludge discharge process of the sludge discharge pump is executed, that is, the sludge discharge pump is started and the cumulative running time of a single sludge discharge is timed. When the cumulative running time of a single sludge discharge reaches the set value, the automatic sludge discharge process of the sludge discharge pump is stopped, that is, the sludge discharge pump is stopped, and the cumulative running time of a single sludge discharge is cleared. The cumulative flow of a single water intake of the system is cleared and the counting starts.

[0023] In one embodiment, the overall intelligent sludge discharge control program further includes a feedback current automatic shutdown process, including:

[0024] When the feedback current value is greater than 5A, the system is emergently stopped, the sludge scraper is immediately stopped, and an alarm prompt is given on the front-end interface of the upper computer.

[0025] Combining all the above technical solutions, the advantages and positive effects of the present invention are as follows:

[0026] First, aiming at the technical problems existing in the above-mentioned prior art and the difficulty of solving this problem, closely combining the technical solution to be protected by the present invention and the results and data in the R & D process, etc., analyze in detail and deeply how the technical solution of the present invention solves the technical problems and the creative technical effects brought after solving the problems. The specific description is as follows:

[0027] One of the creative technologies of the present invention is to reflect the mud level in the coagulation tank through the running current of the sludge scraper during operation, thus solving the problem that the mud level gauge is not accurate and stable enough in actual application. During a certain amount of experimental process, it is obtained that the current of the sludge scraper has a positive correlation trend with the mud layer thickness, and the actual position of the mud level in the tank reflected by the current is relatively stable.

[0028] During the operation of the coagulation sedimentation tank of the present invention, the running current of the sludge scraper has a positive correlation trend with the mud layer thickness, and the current decreases with the reduction of the mud layer thickness after the sludge discharge ends.

[0029] In the sludge discharge condition of the coagulation sedimentation tank of the present invention, the running current of the sludge scraper should be added as the fourth judgment condition, and the coagulation sedimentation tank should adopt an intelligent operation mode of comprehensive judgment of four sludge discharge conditions. The system should comprehensively analyze the influent water quality, influent instantaneous flow rate, sludge return ratio, and effluent water quality, and intelligently switch the priority of the sludge discharge conditions to control the mud layer thickness within a reasonable range to ensure that the effluent water quality meets the standards.

[0030] Second, regarding the technical solution as a whole or from the perspective of the product, the technical effects and advantages of the technical solution to be protected by the present invention are as follows:

[0031] The present invention ensures the accuracy of the process data required for the sewage coagulation sedimentation tank process, making the dosing of chemicals in the process section more accurate, energy-saving and consumption-reducing.

[0032] The above-mentioned measurement and protection functions are achieved with almost zero hardware cost, and it can effectively eliminate the replacement part cost and labor cost caused by the loss after the original equipment's mechanical protection device comes into effect. The development and writing of the integrated intelligent sludge discharging control system software have improved the sewage treatment process of the coagulation sedimentation tank to be more intelligent and accurate.

[0033] Thirdly, as the creative auxiliary evidence of the claims of the present invention, it is also reflected in that the technical solution of the present invention solves the technical problem that people have been eager to solve but have never succeeded in: for most sludge level gauges on the market, the sludge level feedback in a relatively complex building structure and a space with many process equipment has certain deviations and fluctuations in the detected sludge level value due to environmental interference. The method of adding current feedback and the comprehensive judgment program in this invention can well solve this problem. Description of the Drawings

[0034] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.

[0035] Figure 1 It is a schematic diagram of the control system for detecting the sludge level by using the operating current of the sludge scraper provided by the embodiment of the present invention;

[0036] Figure 2 It is a curve graph of the feedback current and the sludge level test data provided by the embodiment of the present invention;

[0037] Figure 3 It is a flowchart of the control method for detecting the sludge level by using the operating current of the sludge scraper provided by the embodiment of the present invention;

[0038] Figure 4 It is a flowchart of the automatic sludge discharging of the sludge level provided by the embodiment of the present invention;

[0039] Figure 5 It is a flowchart of the automatic sludge discharging of the feedback current provided by the embodiment of the present invention;

[0040] Figure 6 It is a flowchart of the sludge discharging at intervals provided by the embodiment of the present invention;

[0041] Figure 7 It is a flowchart of the automatic sludge discharging of the cumulative flow rate of the sludge return pump provided by the embodiment of the present invention;

[0042] Figure 8 It is a flowchart of the automatic shutdown of the feedback current provided by the embodiment of the present invention;

[0043] In the figure: 1. First current transformer; 2. PLC automatic control system; 3. Second current transformer; 4. PLC analog input module; 5. Sludge scraper frequency converter. Detailed Embodiments

[0044] To make the above objects, features and advantages of the present invention more apparent and understandable, the following detailed description of the specific embodiments of the present invention will be given in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0045] I. Explanation of the embodiment:

[0046] The control system for detecting the mud level by using the operating current of the sludge scraper provided in the embodiment of the present invention includes: a first current transformer 1, installed on the three-phase incoming line side of the sludge scraper motor power distribution cabinet, for feeding back the current data to the PLC analog input module 4 through a hard wire and then to the PLC automatic control system 2, and transmitting and feeding back the current data to the PLC automatic control system 2.

[0047] A second current transformer 3, installed on the power supply side of the sludge scraper, feeds back the detected current signal to the PLC analog input module 4 through a hard wire and then to the PLC automatic control system 2; and changes the output selection port of the operating frequency data of the sludge scraper frequency converter motor to the output of the operating current data.

[0048] The sludge scraper frequency converter 5, the operating signal output end of which is connected to the PLC analog input module 4, feeds back the data to the PLC automatic control system 2 for transmitting and feeding back the current data from the sludge scraper frequency converter 5 to the PLC.

[0049] Embodiment 1

[0050] As Figure 1 shown, the control system for detecting the mud level by using the operating current of the sludge scraper provided in the embodiment of the present invention includes:

[0051] A first current transformer 1 is added on the three-phase incoming line side of the sludge scraper motor, and the current data is fed back to the PLC automatic control system 2; the operating frequency data of the sludge scraper frequency converter motor is changed to the operating current data, and the data is fed back to the PLC automatic control system 2 to realize the two-point current data transmission and feedback.

[0052] A second current transformer 3 is installed on the incoming line side of the sludge scraper, and the detected current signal is fed back to the PLC analog input module 4 through a hard wire. The output selection port of the operating frequency data of the sludge scraper frequency converter motor is changed to the output of the operating current data, and the operating signal output end of the sludge scraper frequency converter 5 is connected to the PLC analog input module 4 to feed back the data to the PLC automatic control system 2 to realize the current data transmission and feedback from the sludge scraper frequency converter 5 to the PLC.

[0053] Then, the PLC automatic control system 2 samples the incoming line current detected by the second current transformer 3 and the motor operating current fed back by the sludge scraper frequency converter 5 at a cycle of 200 milliseconds, calculates the weighted average value for 10 seconds, and retains reasonable measurement data. The weight ratio of the two data samples is 50% for the current measured by the current transformer and 50% for the current fed back by the sludge scraper frequency converter 5. The dual-measured current can be used for data comparison and can also avoid abnormal current data caused by the damage of the first current transformer 1 and the second current transformer 3 or the frequency change of the sludge scraper frequency converter 5, which affects the sludge level measurement.

[0054] The relevant hardware provided by the control system for detecting the sludge level by using the operating current of the sludge scraper according to the embodiment of the present invention can comprehensively analyze the sludge layer thickness by combining the incoming line current, the motor operating current and the sludge level meter when the system judges the sludge layer thickness.

[0055] By measuring and recording the corresponding operating current at different actual sludge levels Figure 2 The feedback current is obtained for the sludge level test data curve. Figure 2 The data in it also intuitively shows that the trend of 5 data points from the low sludge level to the high sludge level is close to linear growth, which conforms to the assumption that the current required by the sludge scraper increases with the increase of the sludge level. According to Figure 2 The feedback current value in it is converted into the sludge level position in the program and compared with the actual current to complete the processing process.

[0056] Embodiment 2

[0057] In order to develop an intelligent sludge discharging system, an attempt was also made to convert the sludge level through the feedback of the motor speed by the frequency converter. It was found through experiments that the data accuracy was not as accurate as measuring the sludge level through the feedback current. Another idea was to install sludge level meters of different models for dual measurement. After experiments, it was found that installing multiple judgment bases of different models was not necessarily stable and would cause the judgment logic to be relatively chaotic. Finally, the scheme of measuring the sludge level through the feedback current was selected.

[0058] As Figure 3 shown, the control method for detecting the sludge level by using the operating current of the sludge scraper provided by the embodiment of the present invention includes the following steps:

[0059] S101, the first current transformer 1 added on the three-phase incoming line side of the sludge scraper motor feeds the current data back to the PLC analog input module 4 and then to the PLC automatic control system 2 for current data transmission and feedback;

[0060] S102. The second current transformer 3 installed on the incoming line side of the sludge scraper feeds the detected current signal back to the PLC analog input module 4 through a hard wire and then to the PLC automatic control system 2. Change the output selection port of the motor operating frequency data of the sludge scraper frequency converter to the output of the motor operating current. The operating signal output terminal of the sludge scraper frequency converter 5 is connected to the PLC analog input module 4 to feed the data back to the PLC automatic control system 2 for current data transmission feedback from the sludge scraper frequency converter 5 to the PLC. Install current transformers at two different positions to compare the magnitudes of the two feedback currents in the program. When the difference between the two is greater than 30%, it indicates a fault in the induction device and an alarm will be issued.

[0061] S103. The PLC automatic control system 2 samples the incoming line current detected by the second current transformer 3 and the motor operating current fed back by the sludge scraper frequency converter 5 at a cycle of 200 milliseconds, calculates the weighted average value for 10 seconds, retains the measurement data, and makes a comprehensive judgment on the sludge layer thickness in combination with the sludge level gauge.

[0062] In step S103, the weight ratios of the two groups of data samples are 50% for the current measured by the current transformer and 50% for the current fed back by the sludge scraper frequency converter 5. The dual measurement currents are used for data comparison, which can also avoid abnormal current data caused by the damage of the first current transformer 1 and the second current transformer 3 or the frequency change of the sludge scraper frequency converter 5, affecting the sludge level measurement.

[0063] Furthermore, the control method for detecting the sludge level using the operating current of the sludge scraper provided in the embodiment of the present invention determines the sludge level interval according to process requirements, performs various current-sludge level conversions in the PLC program, and develops and writes an automatic shutdown program for reaching the over-torque protection current.

[0064] At the same time, all four functional sludge discharging processes are optimized and integrated. On the basis of the previous three sludge discharging control methods, not only the feedback current sludge discharging function is added, but also the originally independently controlled sludge discharging control methods are integrated into an overall intelligent sludge discharging control system, which can complete the priority setting of various sludge discharging methods, jointly control the sludge discharging mode by multiple sludge discharging methods, perform functions such as over-torque protection of the sludge scraper, accelerating sludge discharging under the conditions of over-torque and high sludge level, and sludge level control. This makes the process more automated and the operation mode more intelligent and stable.

[0065] In the embodiment of the present invention, the current feedback process is only one of the methods for judging the actual sludge level. Four sludge discharging methods, namely current feedback sludge discharging, sludge level gauge sludge discharging, interval time and return pump cumulative time sludge discharging, can be selectively used according to different process requirements through system settings. For example, when the interval time sludge discharging is selected as the priority, the sludge discharging pump will start after reaching the interval time or when the feedback current or the sludge level gauge feedbacks a high-high alarm of the liquid level.

[0066] Embodiment 3

[0067] Based on the control method for detecting the sludge level using the operating current of the sludge scraper provided in Embodiment 2, in the embodiment of the present invention, the automatic sludge discharge based on the sludge level and the automatic sludge discharge based on the feedback current include:

[0068] As Figure 4 shown, the automatic sludge discharge based on the sludge level provided in the embodiment of the present invention includes: when the sludge level value feedback by the sludge level gauge is greater than the set high sludge level value, start the corresponding surplus sludge pump for the sludge discharge process (the sludge pump frequency is set at 40 Hz); when the sludge level value feedback by the sludge level gauge is less than the set low sludge level value, stop the corresponding surplus sludge pump to stop the sludge discharge for the sludge cultivation process; when the sludge level is in the high sludge level state and the sludge pump has been automatically opened for the cumulative time (20 min) reaching the set high sludge level state, increase the frequency of the surplus sludge pump to the high frequency set value (50 Hz), and if it is in the high frequency state and the sludge level is still at the high sludge level set value for more than 20 minutes, an alarm will be given on the upper computer interface.

[0069] As Figure 5 shown, the automatic sludge discharge based on the feedback current provided in the embodiment of the present invention includes: when the feedback current value (the current value obtained after weighted calculation) is greater than the set high current value, start the corresponding surplus sludge pump for the sludge discharge process (the sludge pump frequency is set at 40 Hz); when the feedback current value is less than the set low current value, stop the corresponding surplus sludge pump to stop the sludge discharge for the sludge cultivation process; when the feedback current value is in the high current value state and the sludge pump has been automatically opened for the cumulative time (20 min) reaching the set high current value state, increase the frequency of the surplus sludge pump to the high frequency set value (50 Hz), and if it is in the high frequency state and the sludge level is still at the high current set value for more than 20 minutes, an alarm will be given on the upper computer interface.

[0070] Embodiment 4

[0071] Based on the control method for detecting the sludge level using the operating current of the sludge scraper provided in Embodiment 2, in the embodiment of the present invention, the sludge discharge at intervals and the automatic sludge discharge based on the cumulative flow of the sludge return pump include:

[0072] As Figure 6 shown, the sludge discharge at intervals provided in the embodiment of the present invention includes: when the single cumulative running time of the system reaches the set value, execute the automatic sludge discharge process of the sludge pump, that is, start the sludge pump and start timing the single cumulative running time of the sludge discharge. When the single cumulative running time of the sludge discharge reaches the set value, stop the automatic sludge discharge process of the sludge pump, that is, stop the sludge pump, clear the single cumulative running time of the sludge discharge, clear the single running time of the system and start timing.

[0073] As Figure 7As shown in the figure, the automatic sludge discharge based on the cumulative flow of the sludge return pump provided by the embodiment of the present invention includes: when the cumulative flow of a single system water inlet reaches the set value, the automatic sludge discharge process of the sludge discharge pump is executed, that is, the sludge discharge pump is started and the cumulative running time of a single sludge discharge is timed. When the cumulative running time of a single sludge discharge reaches the set value, the automatic sludge discharge process of the sludge discharge pump is stopped, that is, the sludge discharge pump is stopped, and the cumulative running time of a single sludge discharge is cleared. The cumulative flow of a single system water inlet is cleared and counting starts.

[0074] Embodiment 5

[0075] As Figure 8 shown, based on the control method for detecting the mud level by using the operating current of the sludge scraper provided by the embodiment, the automatic shutdown process of the feedback current provided by the embodiment of the present invention includes:

[0076] In order to protect the sludge scraper equipment and prevent over-twisting, when the feedback current value is greater than 5A, the system is emergently stopped, the sludge scraper is immediately stopped, and an alarm prompt is given on the front-end interface of the upper computer.

[0077] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not detailed or recorded in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0078] For the information interaction, execution process, etc. between the above-mentioned devices / units, since they are based on the same concept as the method embodiment of the present invention, their specific functions and the technical effects brought about can be specifically referred to in the method embodiment part, and will not be elaborated here.

[0079] Those skilled in the art can clearly understand that, for the convenience and conciseness of description, only the above-mentioned division of each functional unit and module is used as an example for illustration. In practical applications, the above-mentioned functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of the present invention. The specific working process of the units and modules in the above system can refer to the corresponding process in the foregoing method embodiment and will not be elaborated here.

[0080] II. Application Embodiment:

[0081] An embodiment of the present invention further provides a computer device, which includes: at least one processor, a memory, and a computer program stored in the memory and executable on the at least one processor, and when the processor executes the computer program, the steps in any of the above method embodiments are implemented.

[0082] An embodiment of the present invention further provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments can be implemented.

[0083] An embodiment of the present invention further provides an information data processing terminal, which is used to provide a user input interface to implement the steps in the above method embodiments when executed on an electronic device, and the information data processing terminal is not limited to mobile phones, computers, and switches.

[0084] An embodiment of the present invention further provides a server, which is used to provide a user input interface to implement the steps in the above method embodiments when executed on an electronic device.

[0085] An embodiment of the present invention provides a computer program product, and when the computer program product runs on an electronic device, the electronic device can implement the steps in the above method embodiments when executed.

[0086] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, to implement all or part of the processes in the above method embodiments of the present invention, a computer program can be used to instruct relevant hardware to complete, and the computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps in the above method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable medium can at least include: any entity or device capable of carrying the computer program code to the photographing device / terminal device, recording medium, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium. For example, a USB flash drive, a mobile hard disk, a magnetic disk, or an optical disc, etc.

[0087] As described above, it is only a relatively preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A control system for detecting mud level by using the operating current of a sludge scraper, characterized in that, The control system for detecting the mud level by using the operating current of the sludge scraper includes: The first current transformer (1) is installed on the three-phase incoming line side of the distribution cabinet of the sludge scraper motor, and is used to feedback current data to the PLC analog input module (4) through a hard wire and then to the PLC automatic control system (2), so as to transmit and feedback current data to the PLC automatic control system (2); The second current transformer (3) is installed on the power supply side of the sludge scraper, and feeds back the detected current signal to the PLC analog input module (4) through a hard wire and then to the PLC automatic control system (2); and changes the output selection port of the operating frequency data of the sludge scraper frequency converter motor to the output of the operating current data of the motor; The sludge scraper frequency converter (5), the operation signal output end of which is connected to the PLC analog input module (4), feeds back data to the PLC automatic control system (2) to perform the current data transmission feedback from the sludge scraper frequency converter (5) to the PLC; The control method of the control system for detecting the mud level by using the operating current of the sludge scraper includes the following steps: S1, the first current transformer (1) added on the three-phase incoming line side of the sludge scraper motor feeds back current data to the PLC analog input module (4) and then to the PLC automatic control system (2), so as to perform the current data transmission feedback; S2, the second current transformer (3) installed on the power supply side of the sludge scraper feeds back the detected current signal to the PLC analog input module (4) through a hard wire and then to the PLC automatic control system (2); changes the output selection port of the operating frequency data of the sludge scraper frequency converter motor to the output of the operating current data of the motor, and the operation signal output end of the sludge scraper frequency converter (5) is connected to the PLC analog input module (4) to feed back data to the PLC automatic control system (2) to perform the current data transmission feedback from the sludge scraper frequency converter (5) to the PLC; current transformers installed at two different positions are used to compare the magnitudes of the two feedback currents in the program. When the difference between the two is greater than 30%, it indicates a fault in the induction device and an alarm will be issued; S3, the PLC automatic control system (2) performs periodic sampling on the current detected by the second current transformer (3) and the motor operating current fed back by the sludge scraper frequency converter (5), calculates the weighted average value, retains the measurement data, and makes a comprehensive judgment on the mud layer thickness in combination with the mud level gauge.

2. The control system for detecting the mud level by using the operating current of the sludge scraper according to claim 1, wherein The control system for detecting the mud level by using the operating current of the sludge scraper further includes a mud level gauge for measuring the mud layer thickness.

3. The control system for detecting the mud level by using the running current of the sludge scraper according to claim 1, characterized in that, In step S3, the fed-back motor operating current is sampled at a period of 200 milliseconds, and the average value for 10 seconds is calculated.

4. The control system for detecting the mud level by using the operating current of the sludge scraper according to claim 1, wherein In step S3, the weight ratio of the two groups of data samples is 50% for the current measured by the current transformer and 50% for the current fed back by the sludge scraper frequency converter (5).

5. The control system for detecting the mud level by using the operating current of the sludge scraper according to claim 1, characterized in that, The control method for detecting the mud level by using the operating current of the sludge scraper further includes: Optimally integrating the automatic mud discharging process of the mud level, the intermittent time mud discharging process, the automatic mud discharging process of the cumulative flow of the sludge return pump, and the automatic mud discharging process of the feedback current into an overall intelligent mud discharging control program, setting the priorities of various mud discharging methods, and jointly controlling the mud discharging by using multiple mud discharging methods.

6. The control system for detecting the mud level by using the operating current of the sludge scraper according to claim 5, wherein The automatic sludge level drainage process includes: when the sludge level meter feeds back that the sludge level value is greater than the set high sludge level value, start the corresponding excess sludge pump for the drainage process, and set the drainage pump frequency to 40 Hz; when the sludge level meter feeds back that the sludge level value is less than the set low sludge level value, stop the corresponding excess sludge pump to stop drainage and start the sludge cultivation process; when the sludge level is in the high sludge level state and the drainage pump has been automatically opened for 20 minutes at the set high sludge level state, increase the frequency of the excess sludge pump to the high frequency set value of 50 Hz. If it is in the high frequency state and the sludge level is still at the high sludge level set value for more than 20 minutes, an alarm will be given on the upper computer interface.

7. The control system for detecting the mud level by using the operating current of the sludge scraper according to claim 5, wherein The automatic drainage of the feedback current includes: when the calculated current value after weighted calculation of the feedback is greater than the set high current value, start the corresponding excess sludge pump for the drainage process, and set the drainage pump frequency to 40 Hz; when the feedback current value is less than the set low current value, stop the corresponding excess sludge pump to stop drainage and start the sludge cultivation process; when the feedback current value is in the high current value state and the drainage pump has been automatically opened for 20 minutes at the set high current value state, increase the frequency of the excess sludge pump to the high frequency set value of 50 Hz. If it is in the high frequency state and the sludge level is still at the high current set value for more than 20 minutes, an alarm will be given on the upper computer interface.

8. The control system for detecting the mud level by using the operating current of the sludge scraper according to claim 5, characterized in that, The drainage process at intervals includes: when the cumulative running time of the system for a single time reaches the set value, execute the automatic drainage process of the drainage pump, that is, start the drainage pump and start timing the cumulative running time of a single drainage. When the cumulative running time of a single drainage reaches the set value, stop the automatic drainage process of the drainage pump, that is, stop the drainage pump, clear the cumulative running time of a single drainage, clear the single running time of the system and start timing; The automatic drainage process of the cumulative flow of the sludge return pump includes: when the cumulative inflow of the system for a single time reaches the set value, execute the automatic drainage process of the drainage pump, that is, start the drainage pump and start timing the cumulative running time of a single drainage. When the cumulative running time of a single drainage reaches the set value, stop the automatic drainage process of the drainage pump, that is, stop the drainage pump, clear the cumulative running time of a single drainage, clear the cumulative inflow of the system for a single time and start counting.

9. The control system for detecting the mud level by using the operating current of the sludge scraper according to claim 5, characterized in that, The overall intelligent sludge drainage control program also includes a feedback current automatic shutdown process, including: When the feedback current value is greater than 5 A, execute an emergency stop of the system, immediately stop the sludge scraper and give an alarm prompt on the front-end interface of the upper computer.

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