Sludge moisture content detection device and detection method

Abstract

The present invention discloses a sludge moisture content detection device and detection method, including a cavity, a feed component, a detection component, and a cleaning component. The cavity is used to install the feed component, the detection component, and the cleaning component; the sludge to be detected first enters the feed component for crushing and refinement, and is sieved and homogenized at the same time. The processed sludge with small and uniform particles then enters the detection area of ​​the detection component. The open coaxial resonant cavity in the detection component detects the sludge moisture content. Finally, the sludge that has been detected reaches the cleaning component for cleaning. The present invention uses a microwave method to detect the moisture content of the sludge, with fast detection speed and high accuracy. The sludge moisture content detection device proposed by the present invention realizes the integrated control of the refinement, detection, and cleaning processes in the sludge detection process. The detection process is time-saving, with a high degree of automation, and saves manpower.

Description

Technical Field

[0001] The invention relates to the field of sludge moisture content detection, and in particular to a sludge moisture content detection device and a detection method. Background Art

[0002] my country has a huge amount of sludge production, and sludge reduction treatment is an indispensable part of the development of a civilized society. At present, the main method for measuring sludge moisture content is the traditional weight method, namely the drying method, that is, the sludge moisture content is calculated by measuring the mass before and after drying, and the detection accuracy is high. However, there are also many defects. The drying method detection requires nearly 24 hours of drying time, which is time-consuming, and uses more instruments and is complicated to operate. It is difficult to achieve online automatic rapid detection of sludge moisture content. Therefore, there is an urgent need on the market for a sludge moisture content measurement device and a detection method that has a fast detection speed, high accuracy and can realize online detection.

[0003] The existing method uses microwave signals to indirectly measure moisture content, and uses the relationship between microwave signals and the dielectric constant of the sample to convert the moisture content of the sample. This method is more stringent for sample preparation, and the equipment for measuring the dielectric constant of the sample is expensive. In addition, the sludge morphology must be relatively regular, but due to the complex and changeable nature of the sludge, during the drying process, the sludge morphology will slowly change from a soft and smooth muddy surface to a hard and uneven curved surface, and the moisture content of the upper and lower surfaces and the middle part are different. When we take the sludge block, it is difficult to ensure that the overall moisture content of the sludge sample is detected, which will greatly affect the detection accuracy. Therefore, the sludge moisture content detection device designed by the present invention is designed with a crushing and screening device to crush the sludge before the sludge is sent to the opening end of the resonant cavity, and by considering the influence of the sludge thickness on the moisture content detection result, the sludge thickness is controlled at 10mm, the detection accuracy is improved, and the automatic detection of the sludge moisture content is realized. Summary of the invention

[0004] In view of this, the purpose of the present invention is to propose a sludge moisture content detection device and detection method, which uses a microwave method in conjunction with a detection device to perform rapid, real-time, accurate, and fully automated moisture content detection on the sludge, thereby solving the problems of complex, time-consuming, and low degree of automation in the sludge moisture content detection process on the market.

[0005] A sludge moisture content detection device proposed according to the purpose of the present invention includes a cavity, a feeding component, a rotating conveying component, a detection component, and a cleaning component, and is characterized in that: the cavity includes a first chamber, a second chamber, and a third chamber, the feeding component is installed directly above the first chamber, and the first chamber is also equipped with a rotating conveying component. The feeding component crushes and screens the sludge to be detected, and the screened and refined sludge is transported to the detection component through the rotating conveying component for moisture content detection. The moisture content detection component is installed in the first chamber and forms an angle of ninety degrees with the installation position of the feeding component on the plane. The sludge after detection is transported to the cleaning component through the rotating conveying component for sludge cleaning.

[0006] Furthermore, the detection component includes an open coaxial resonant cavity, a signal transceiver, and a transceiver bracket. The open coaxial resonant cavity is installed inside the first cavity. The open coaxial resonant cavity transmits signals to the signal transceiver through a coaxial line. The signal generating device is installed on the transceiver bracket in the second cavity. The open coaxial resonant cavity uses a microwave method to detect the moisture content of the sludge.

[0007] Furthermore, the open coaxial resonant cavity comprises an inner conductor, an input probe and an output probe, a wiring port, a coaxial line, and a resonant cavity body. The inner conductor is arranged at the center of the open coaxial resonant cavity, the input probe and the output probe are symmetrically arranged on the inner side wall of the resonant cavity, the wiring port is arranged on the outer side wall of the open coaxial resonant cavity, concentric with the input probe and the output probe, the inner wall of the resonant cavity is silver-plated, the resonant cavity uses an industrial microwave source of 2.4 GHz, and after optimization, the resonant cavity body is 30 mm high and the cavity radius is 16 mm. The inner conductor material is iron, the inner conductor radius is 4 mm and the height is 23.6 mm, the input probe and the output probe have a radius of 0.65 mm, and the input probe and the output probe are arranged at a height of 18.8 mm of the resonant cavity. Due to the reciprocity, the input and output of the two ports can be interchanged.

[0008] Furthermore, the rotating conveying assembly includes a rotating table, a mud-carrying plate, a gear shaft, a reducer, and a conveying motor. The rotating table is provided with four positioning detection cavities of the same size and structure that are evenly distributed on the circumference. The mud-carrying plate is installed in the positioning detection cavity. The rotating table is connected to the gear shaft, and the gear shaft is connected to the conveying motor through the reducer. The rotating conveying assembly is driven by the conveying motor.

[0009] Furthermore, four positioning grooves are evenly arranged on the circumference of the positioning detection cavity, the mud-carrying plate is fixed in the positioning detection cavity through the positioning grooves, the bottom of the mud-carrying plate is fitted with the open end of the open coaxial resonant cavity, and the detection area of ​​the open coaxial resonant cavity is included in the internal cavity area of ​​the positioning detection cavity.

[0010] Furthermore, the feed assembly includes a feed pipe, a sludge crusher, a screening device, and a first push rod motor. The feed pipe transports the sludge into the sludge crusher for crushing. A filter screen is arranged inside the screening device, and the filter screen is installed at an inclination of 10°. A residual material channel is arranged on the cavity wall of the screening device, and the residual material channel is arranged at the lowest inclination end of the filter screen. The screening device is connected to the lower end of the sludge crusher to further screen and homogenize the crushed sludge. A micro vibrator is installed at the lower end of the screening device, and the large particles and uneven sludge remaining on the filter screen are discharged through the residual material channel.

[0011] Furthermore, the first push rod motor is concentric with the screening device, and a first identification camera is installed at the bottom of the screening device. When the first identification camera recognizes that the center of the mud-carrying plate installed on the rotating table reaches the center of the screening device, the driving motor stops working, and the first push rod motor starts to push the mud-carrying plate to the discharge end of the screening device. The discharge end of the screening device is provided with 4 circumferentially evenly distributed positioning slots, and a first pressure sensor is provided in the positioning slot. After the first pressure sensor detects that the mud-carrying plate is in place, the feeding assembly starts to work to feed mud and prepare samples, and the thickness of the screened and refined sludge is set to 10 mm.

[0012] Furthermore, the material cleaning component includes a second identification camera, a second push rod motor, a material cleaning platform, a waste channel, a first high-speed jet valve, a second high-speed jet valve, a third high-speed jet valve, and a waste collection device. The material cleaning platform is provided with a mud cleaning positioning hole, and the mud cleaning positioning hole is concentric with the second push rod motor. When the second identification camera detects that the center of the mud carrying plate on the rotating platform reaches the center of the push rod of the second push rod motor and there is sludge on the mud carrying plate, the drive motor stops rotating, and the second push rod motor starts to push the mud carrying plate to the mud cleaning positioning hole. Four fixed cards are evenly distributed on the circumference of the mud cleaning positioning hole. A second pressure sensor is arranged in the fixed card slot. When the second pressure sensor detects a signal, the second push rod motor stops, and the first high-speed jet valve, the second high-speed jet valve and the third high-speed jet valve work to remove the sludge on the mud-carrying plate to the waste channel and enter the waste collecting device, and output it through a discharge pipe connected to the waste collecting device. A residual material sliding pipe connected to the residual material channel is installed above the waste channel. The screening device screens the remaining large-particle uneven sludge, which enters the waste channel and the waste collecting device through the residual material sliding pipe.

[0013] The sludge moisture content detection method proposed according to the purpose of the present invention comprises the following detection steps:

[0014] Step 1: The feeding component crushes and screens the sludge to be tested, and the rotating conveying device transports the screened and refined sludge to the open coaxial resonant cavity detection area of ​​the detection component;

[0015] Step 2: The signal transceiver device is connected to the input probe connection port on the side wall of the open coaxial resonant cavity through the input coaxial line to couple the electromagnetic wave energy to the open coaxial resonant cavity through the input probe. The moisture in the sludge will consume the electromagnetic wave energy to form a frequency shift. The output probe at the other port couples the energy to the signal transceiver device through the coaxial line.

[0016] Step 3: The signal transceiver collects the received resonant frequency and return loss to the computer in real time through the data acquisition card, and writes the relationship between the sludge moisture content and the resonant frequency into the calculation and display module of the virtual instrument LABVIEW in the designed computer. In this way, each time the no-load resonant frequency and the loaded resonant frequency are detected, the sludge moisture content value can be directly obtained and displayed.

[0017] Furthermore, the sludge moisture content detection method and the sludge moisture content calculation process are as follows:

[0018] (1) Measure the no-load resonant frequency and return loss value;

[0019] (2) The crushed sludge is transferred to the open end of the open coaxial resonant cavity through a rotating conveying device, and the corresponding resonant frequency and return loss value under different sludge moisture contents are measured;

[0020] (3) The moisture content value calculated by the drying method and the resonance frequency offset are linearly regressed to obtain a prediction model for the sludge moisture content;

[0021] (4) The water content prediction model is written into the data processing module in LABVIEW. The next time the measurement is performed, the water content value can be directly displayed by collecting the loaded resonant frequency;

[0022] The moisture content measurement model is:

[0023] Moisture content = -0.021798×(unloaded resonant frequency - loaded resonant frequency)^3+1.097072×(unloaded resonant frequency - loaded resonant frequency)^2-13.370193×(unloaded resonant frequency - loaded resonant frequency)+51.15381. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 : Schematic diagram of the overall structure of the sludge moisture content detection device of the present invention;

[0025] Figure 2 : Figure 1 Schematic diagram of the internal structure of the sludge moisture content detection device;

[0026] Figure 3 : Figure 2 Schematic diagram of the first chamber of the internal structure of the medium sludge moisture content detection device and the partial internal structure of the cleaning station;

[0027] Figure 4 : Figure 3 Middle partial enlarged picture;

[0028] Figure 5 : Schematic diagram of the overall structure of the screening device;

[0029] Figure 6 : Schematic diagram of the open coaxial resonant cavity structure;

[0030] Figure 7 : Detection flow chart;

[0031] Figure 8 : Figure 6 S-parameter diagram after simulation optimization of the open coaxial resonant cavity;

[0032] In the figure: 1: cavity; 11: first cavity; 12: second cavity; 13: third cavity; 14: orifice plate revolving door; 2: feed assembly; 21: feed pipe; 22: sludge crusher; 23: screening device; 231: screening cavity; 2311: positioning slot; 2312: first pressure sensor; 2313: residual material channel; 2314: residual material sliding pipe; 232: filter screen; 233: micro vibrator; 234: first recognition camera; 24: first push rod motor; 3: rotating conveying device; 31: rotating round table; 32: mud carrying plate; 33: gear shaft; 34: reducer; 35: drive motor; 36: positioning detection cavity; 3 61: positioning groove; 4: detection component; 41: open coaxial resonant cavity; 411: inner conductor; 412: input probe; 413: output probe; 414: wiring port; 415: coaxial line; 416: resonant cavity; 42: signal transceiver; 43: transceiver bracket; 5: material cleaning component; 51: second recognition camera; 52: second push rod motor; 53: material cleaning platform; 531: mud cleaning positioning hole; 532: fixed card slot; 533: second pressure sensor; 54: waste channel; 55: first high-speed jet valve; 56: second high-speed jet valve; 57: third high-speed jet valve; 58: waste collection device; 581: discharge pipe; DETAILED DESCRIPTION

[0033] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings, but these embodiments do not limit the present invention. Structural, methodological, or functional changes made by ordinary technicians in the field based on these embodiments are all included in the protection scope of the present invention.

[0034] Please refer to Figure 1 and Figure 2 As shown, as an embodiment, a sludge moisture content detection device includes a cavity 1, a feeding component 2, a rotating conveying component 3, a detection component 4, and a cleaning component 5, characterized in that: the cavity includes a first chamber 11, a second chamber 12, and a third chamber 13, the feeding component 2 is installed directly above the first chamber 11, and the first chamber 11 is also equipped with a rotating conveying component 3, the feeding component 2 crushes and screens the sludge to be detected, and the screened and refined sludge is transported to the detection component 4 through the rotating conveying component 3 for moisture content detection, the moisture content detection component is installed in the first chamber 11, and forms an angle of ninety degrees with the installation position of the feeding component 2 on the plane, the sludge after the detection is completed is transported to the cleaning component 5 through the rotating conveying component 3 for sludge cleaning, and the entire detection process: feeding → crushing → screening → detection → cleaning is integrated and fully automatic in the present invention, and the detection process of machine replacing people improves the detection efficiency and the real-time nature of the detection results while ensuring the detection accuracy.

[0035] Please refer to Figure 2 As shown, as an implementation method, the detection component 4 includes an open coaxial resonant cavity 41, a signal transceiver 42, and a transceiver bracket 43. The open coaxial resonant cavity 41 is installed inside the first chamber 11. The open coaxial resonant cavity 41 transmits signals with the signal transceiver 42 through a coaxial line 416. The signal generating device 42 is installed on the transceiver bracket 43 in the second cavity 12. The open coaxial resonant cavity 41 uses a microwave method to detect the moisture content of the sludge. The microwave method converts the moisture content of the sludge through the frequency offset in the resonant cavity. The detection speed is fast and only a few seconds are needed to obtain the moisture content of the sludge. Compared with traditional sludge moisture content detection methods, such as the drying method, the detection time is greatly shortened. At the same time, with the sludge moisture content detection device proposed in the present invention, the entire sludge moisture content detection process becomes more concise, which brings great convenience to the moisture content detection in the sludge reduction process.

[0036] As an implementation, see Figure 6 As shown, the open coaxial resonant cavity 41 includes an inner conductor 411, an input probe 412 and an output probe 413, a wiring port 414, a coaxial line 415, and a resonant cavity body 416. The inner conductor 411 is arranged at the center of the open coaxial resonant cavity 41, the input probe 412 and the output probe 413 are symmetrically arranged on the inner side wall of the resonant cavity body 416, the wiring port 414 is arranged on the outer side wall of the resonant cavity body 416, and is concentric with the input probe 412 and the output probe 413. 16 The inner wall is silver-plated, and the resonant cavity uses an industrial microwave source of 2.4GHz. After optimization, the resonant cavity body 416 is 30mm high and has a cavity radius of 16mm. The inner conductor 411 is made of iron, and the inner conductor 411 has a radius of 4mm and a height of 23.6mm. The input probe 412 and the output probe 413 have a radius of 0.65mm, and the input probe 412 and the output probe 413 are arranged at a height of 18.8mm in the resonant cavity 416. Due to the mutual difference, the input and output of the two ports can be interchanged.

[0037] As an implementation, see Figure 1 As shown, the rotating conveying assembly 3 includes a rotating table 31, a mud-carrying plate 32, a gear shaft 33, a reducer 34, and a conveying motor 35. The rotating table 31 is provided with four positioning detection cavities 36 of the same size and structure that are evenly distributed on the circumference. The mud-carrying plate 32 is installed in the positioning detection cavity 36. The rotating table 31 is connected to the gear shaft 33. The gear shaft 33 is connected to the conveying motor 35 through the reducer 34. The rotating conveying assembly 3 is driven by the conveying motor 35.

[0038] As an implementation, see Figure 2 As shown, four positioning grooves 361 are evenly arranged on the circumference of the positioning and detection cavity 36, and the mud-carrying plate 32 is fixed in the positioning and detection cavity 36 through the positioning grooves 361. The bottom of the mud-carrying plate 32 is fitted with the open end of the open coaxial resonant cavity 41, and the detection area of ​​the open coaxial resonant cavity 41 is included in the internal cavity area of ​​the positioning and detection cavity 36.

[0039] As an implementation, see Figure 2 and Figure 5 As shown, the feed assembly 2 includes a feed pipe 21, a sludge crusher 22, a screening device 23, and a first push rod motor 24. The feed pipe 21 transports the sludge into the sludge crusher 22 for crushing. A filter screen 232 is arranged inside the screening device 23, and the filter screen 232 is installed at an angle of 10°. A residual material channel 2313 is arranged on the wall of the screening cavity 231 of the screening device 23, and the residual material channel 2313 is arranged at the lowest inclined end of the filter screen 232. The screening device 23 is connected to the lower end of the sludge crusher 22 to further screen and homogenize the crushed sludge. A micro vibrator 233 is installed at the lower end of the screening device 23, and the large particles and uneven sludge remaining on the filter screen 232 are discharged through the residual material channel 2313.

[0040] As an implementation, please refer to Figure 2 , Figure 3 and Figure 5 As shown, the first push rod motor 24 is concentric with the screening device 23, and a first identification camera 234 is installed at the bottom of the screening device 23. When the first identification camera 234 recognizes that the center of the mud-carrying plate 32 installed on the rotating table 31 reaches the center of the screening device 23, the driving motor 35 stops working, and the first push rod motor 24 starts to push the mud-carrying plate 32 to the discharge end of the screening device 23. The discharge end of the screening device 23 is provided with 4 circumferentially evenly distributed positioning grooves 2311, and a first pressure sensor 2312 is provided in the positioning groove 2311. After the first pressure sensor 2312 detects that the mud-carrying plate 32 is in place, the feeding assembly 2 starts to work to feed mud for sampling. To ensure the high quality of sample preparation, the thickness of the screened and refined sludge is set to 10 mm.

[0041] As an implementation, see Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the cleaning component 5 includes 51 a second identification camera, 52 a second push rod motor, 53 a cleaning platform, 54 a waste channel, 55 a first high-speed jet valve, 56 a second high-speed jet valve, 57 a third high-speed jet valve, and 68 a waste collection device. The cleaning platform 53 is provided with a mud cleaning positioning hole 531, and the cleaning positioning hole 531 is concentric with the second push rod motor 52. When the second identification camera 51 detects that the center of the mud carrying plate 32 on the rotating truncated table 31 reaches the center of the push rod of the second push rod motor 52 and there is mud on the mud carrying plate 32, the driving motor 35 stops rotating, and the second push rod motor 52 starts to push the mud carrying plate 32 to the mud cleaning positioning hole 531, and 4 fixed card slots are evenly distributed on the circumference of the mud cleaning positioning hole 531. 532, a second pressure sensor 533 is arranged in the fixed card slot 532, when the second pressure sensor 533 detects a signal, the second push rod motor 52 stops, the first high-speed jet valve 55, the second high-speed jet valve 56 and the third high-speed jet valve 57 work, and the sludge on the mud carrying plate 32 is removed to the waste channel 54 and enters the waste collecting device 58, and is output through the discharge pipe 581 connected to the waste collecting device 58, and a residual material sliding pipe 2314 connected to the residual material channel 2313 is installed above the waste channel 58, and the remaining large particles of uneven sludge screened by the screening device 23 enter the waste channel 54 and the waste collecting device 58 through the residual material sliding pipe 2314.

[0042] As a method for measuring the moisture content of sludge, please refer to Figure 2 and Figure 4 As shown, the detection steps are:

[0043] Step 1: The feeding component 2 crushes and screens the sludge to be tested, and the rotating conveying device 3 transports the screened and refined sludge to the detection area of ​​the open coaxial resonant cavity 41 of the detection component;

[0044] Step 2: The signal transceiver 42 is connected to the input probe 412 connection port on the side wall of the open coaxial resonant cavity 41 through the coaxial line 415 to input the electromagnetic wave signal into the open coaxial resonant cavity 41 through the input probe 412. The water in the sludge will consume the electromagnetic wave energy to form a frequency shift. The other port output 413 probe couples the energy to the signal transceiver 42 through the coaxial line 415.

[0045] Step 3: The signal transceiver 42 collects the received resonant frequency and echo loss to the computer in real time through the data acquisition card, and writes the relationship between the sludge moisture content and the resonant frequency into the calculation and display module of the virtual instrument LABVIEW in the designed computer. In this way, each time the no-load resonant frequency and the loaded resonant frequency are detected, the sludge moisture content value can be directly obtained and displayed.

[0046] As an implementation method, the sludge moisture content detection method has the following calculation process for the sludge moisture content:

[0047] (1) Measure the no-load resonant frequency and return loss value;

[0048] (2) The crushed sludge is transferred to the open end of the open coaxial resonant cavity 41 through the rotating conveying device 3, and the corresponding resonant frequency and return loss value under different sludge moisture contents are measured;

[0049] (3) The moisture content value calculated by the drying method and the resonance frequency offset are linearly regressed to obtain a prediction model for the sludge moisture content;

[0050] (4) The water content prediction model is written into the data processing module in LABVIEW. The next time the measurement is performed, the water content value can be directly displayed by collecting the loaded resonant frequency;

[0051] The moisture content measurement model is:

[0052] Moisture content = -0.021798×(unloaded resonant frequency - loaded resonant frequency)^3+1.097072×(unloaded resonant frequency - loaded resonant frequency)^2-13.370193×(unloaded resonant frequency - loaded resonant frequency)+51.15381.

[0053] The entire working process of the sludge moisture content detection device is as follows: the device is started, the rotating conveying component is positioned at the center, the driving motor is started to drive the rotating table to rotate, the first recognition camera identifies the center of the positioning detection cavity, when the center of the positioning detection cavity reaches the center position of the first push rod motor push rod, the driving motor stops, the first push rod motor starts to push the mud-carrying plate to cooperate with the screening device, and the first pressure sensor in the positioning slot at the bottom of the screening device cavity detects that the mud-carrying plate has reached the specified position, the first push rod motor stops, the feeding component starts feeding, and the sludge crusher on it feeds the mud. The sludge coming in from the pipeline is crushed, and the screening device further screens the crushed sludge. The evenly refined sludge obtained by screening falls on the mud-carrying plate. The micro vibrator at the bottom of the screening cavity of the screening device vibrates at the bottom of the screening cavity, so that the sludge on the mud-carrying plate is evenly spread on the mud-carrying plate. When the height sensor set inside the screening device detects that the sludge thickness on the mud-carrying plate accumulates to 10mm, the feeding component stops working, the first push rod motor starts to carry the mud-carrying plate back to the positioning detection cavity, and the drive motor starts to drive the rotating table to rotate clockwise. When the first identification When the camera recognizes again that the center of the next positioning detection cavity reaches the center of the first push rod motor push rod, the drive motor stops, and the open coaxial resonant cavity detects the moisture content of the sludge that reaches the detection area. While detecting, the feeding component repeats the above steps to feed. After the feeding is completed, the drive motor starts to transfer the sludge that has completed the first detection to the working area of ​​the cleaning component. When the second recognition camera detects that the center position of the positioning detection cavity reaches the center position of the second push rod motor push rod, the drive motor stops and the second push rod motor starts to push the sludge carrying plate carrying the sludge to the sludge cleaning positioning of the cleaning table. Hole, after the second pressure sensor in the fixed slot of the mud cleaning positioning hole detects that the mud carrying plate is in place, the second push rod clicks to stop, and the first high-speed jet valve, the second high-speed jet valve, and the third high-speed jet valve are started to clean the sludge on the mud carrying plate into the material dropping channel. After the mud cleaning is completed, the second push rod motor carries the mud carrying plate back to the positioning detection chamber, and the feeding in the feeding area and the detection in the detection area are carried out simultaneously. Three of the four positioning detection chambers perform feeding, detection and mud cleaning at the same time, and one is located between the feeding working area and the mud cleaning working area to prepare for the subsequent detection process.

[0054] Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

1. A sludge moisture content detection device, comprising: The chamber body, the feeding assembly, the rotating conveying assembly, the detecting assembly and the cleaning assembly are characterized in that: the chamber body comprises a first chamber, a second chamber and a third chamber; the feeding assembly is installed directly above the first chamber; the first chamber is also equipped with the rotating conveying assembly; the feeding assembly crushes and screens the sludge to be detected; the screened and refined sludge is transported to the detecting assembly through the rotating conveying assembly for moisture content detection; the detecting assembly is installed in the first chamber and forms a ninety-degree angle with the installation position of the feeding assembly on the plane; the sludge after detection is transported to the cleaning assembly through the rotating conveying assembly for sludge cleaning; wherein: The feeding assembly includes a feeding pipeline, a sludge crusher, a screening device, and a first push rod motor; a filter screen is arranged inside the screening device, the filter screen is installed at an inclination of 10°, a residual material channel is arranged on the cavity wall of the screening device, and the residual material channel is arranged at the lowest inclination end of the filter screen; a micro vibrator is installed at the lower end of the screening device; the first push rod motor is concentric with the screening device, and a first recognition camera is installed at the bottom of the screening device. When the first recognition camera recognizes that the center of the mud-carrying plate installed on the rotating table reaches the center of the screening device, the driving motor stops working, and the first push rod motor starts to push the mud-carrying plate to the discharge end of the screening device. The discharge end of the screening device is provided with 4 positioning slots evenly distributed around the circumference, and a first pressure sensor is arranged in the positioning slot. After the first pressure sensor detects that the mud-carrying plate is in place, the feeding assembly starts to work to feed mud and prepare samples, and the thickness of the screened and refined sludge is set to 10mm; The rotating conveying assembly includes a rotating truncated table, a mud-carrying plate, a gear shaft, a reducer, and a conveying motor. The rotating truncated table is provided with four positioning detection cavities of the same size and structure that are evenly distributed on the circumference. The mud-carrying plate is installed in the positioning detection cavity. The rotating truncated table is connected to the gear shaft, and the gear shaft is connected to the conveying motor through the reducer. The rotating conveying assembly is driven by the conveying motor. Four positioning grooves are evenly arranged on the circumference of the positioning detection cavity. The mud-carrying plate is fixed in the positioning detection cavity through the positioning grooves. The bottom of the mud-carrying plate fits with the open end of the open coaxial resonant cavity. The detection area of ​​the open coaxial resonant cavity is contained in the cavity internal area of ​​the positioning detection cavity. The detection component includes an open coaxial resonant cavity, a signal transceiver, and a transceiver bracket. The open coaxial resonant cavity is installed inside the first cavity. The open coaxial resonant cavity includes an inner conductor, an input probe and an output probe, a wiring port, and a resonant cavity body. The inner conductor is arranged at the center of the open coaxial resonant cavity. The input probe and the output probe are symmetrically arranged on the inner wall of the resonant cavity. The wiring port is arranged on the outer wall of the open coaxial resonant cavity, concentric with the input probe and the output probe. The inner wall of the resonant cavity is silver-plated. The resonant cavity uses an industrial microwave source of 2.4GHz. The resonant cavity body is 30mm high and the cavity radius is 16mm. The inner conductor material is iron. The inner conductor radius is 4mm and the height is 23.6mm. The input probe and the output probe have a radius of 0.65mm. The input probe and the output probe are arranged at a height of 18.8mm in the resonant cavity. Due to the mutual difference, the input and output of the two ports can be interchanged. The material cleaning component includes a second identification camera, a second push rod motor, a material cleaning platform, a waste channel, a first high-speed jet valve, a second high-speed jet valve, a third high-speed jet valve, and a waste collection device. The material cleaning platform is provided with a mud cleaning positioning hole, and the mud cleaning positioning hole is concentric with the second push rod motor; four fixed card slots are evenly distributed on the circumference of the mud cleaning positioning hole, and a second pressure sensor is arranged in the fixed card slot. When the second pressure sensor detects a signal, the second push rod motor stops, and the first high-speed jet valve, the second high-speed jet valve and the third high-speed jet valve work to remove the sludge on the mud carrying plate to the waste channel and enter the waste collection device, and output it through the discharge pipe connected to the waste collection device. A residual material sliding pipe connected to the residual material channel is installed above the waste channel, and the screening device screens the remaining large-particle uneven sludge through the residual material sliding pipe into the waste channel and the waste collection device.

2. The sludge moisture content detection device according to claim 1, characterized in that: The open coaxial resonant cavity transmits signals to the signal transceiver through a coaxial line. The signal generating device is installed on the transceiver bracket in the second chamber. The open coaxial resonant cavity uses a microwave method to detect the moisture content of the sludge.

3. A method for detecting sludge moisture content based on the sludge moisture content detection device according to any one of claims 1 to 2, characterized in that: The detection steps include the following: Step 1: The feeding component crushes and screens the sludge to be tested, and the rotating conveying component transports the screened and refined sludge to the open coaxial resonant cavity detection area of ​​the detection component; Step 2: The signal transceiver device is connected to the input probe connection port on the side wall of the open coaxial resonant cavity through the input coaxial line to couple the electromagnetic wave energy to the open coaxial resonant cavity through the output probe at the port. The moisture in the sludge will consume the electromagnetic wave energy to form a frequency shift. The output probe at the other port couples the energy to the signal transceiver device through the coaxial line. Step 3: The signal transceiver collects the received resonant frequency and return loss to the computer in real time through the data acquisition card, and writes the relationship between the sludge moisture content and the resonant frequency into the calculation and display module of the virtual instrument LABVIEW in the designed computer. In this way, each time the no-load resonant frequency and the loaded resonant frequency are detected, the sludge moisture content value can be directly obtained and displayed.

4. According to the sludge moisture content detection method of claim 3, the sludge moisture content calculation process is as follows: (1) Measure the no-load resonant frequency and return loss value; (2) The crushed sludge is transferred to the open end of the open coaxial resonant cavity through the rotating conveying assembly, and the corresponding resonant frequency and return loss value under different sludge moisture contents are measured; (3) The moisture content value calculated by the drying method and the resonance frequency offset are linearly regressed to obtain a prediction model for the sludge moisture content; (4) The water content prediction model is written into the data processing module in LABVIEW. The next time the measurement is performed, the water content value can be directly displayed by collecting the loaded resonant frequency; The moisture content measurement model is: Moisture content = -0.021798×(unloaded resonant frequency - loaded resonant frequency)^3+1.097072×(unloaded resonant frequency - loaded resonant frequency)^2-13.370193×(unloaded resonant frequency - loaded resonant frequency)+51.15381.

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