Slurry concentration detection device

Abstract

The utility model relates to the technical field of slurry concentration online detection, and particularly discloses a slurry concentration detection device which comprises a shielding shell, a radio frequency generator, a transmitting antenna, a receiving antenna, a temperature probe and a control system, a radio frequency controller in the control system controls a radio frequency generator to generate electromagnetic waves, so that a transmitting antenna transmits the electromagnetic waves to a receiving antenna, the receiving antenna can extend into slurry, the electromagnetic waves received by the receiving antenna are electromagnetic waves transmitted from the slurry, and the propagation rate of the electromagnetic waves in water and the concentration of the water are used as known quantities. The real-time slurry temperature measured by the temperature probe is combined, so that the concentration of the slurry measured in real time can be calculated, and nondestructive detection of the slurry concentration is realized; the concentration detection is not influenced by friction force of slurry contact, the antenna is not abraded and deformed, the concentration detection precision is improved, moving parts and quick-wear parts are not arranged, the failure rate is low, detection can be realized by installing the device on a slurry pipe, the device is convenient to install and use and low in energy consumption, and the production benefit is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of slurry concentration online detection, in particular to a slurry concentration detection device. Background Art

[0002] Papermaking companies are increasingly demanding higher quality paper. Paper quality is not only influenced by raw materials but also by the production process. The papermaking process includes pulping and papermaking. Both processes require circulating water to dilute the pulp to achieve the required concentration. Therefore, online, real-time, and accurate measurement of pulp concentration, along with effective control, is crucial to the papermaking process. Accurate online measurement of pulp concentration during the pulping process stabilizes the beating effect. Accurate concentration measurement in papermaking, coupled with closed-loop control, stabilizes the on-line concentration, reduces concentration fluctuations, and improves production stability and paper quality.

[0003] At present, the widely used online pulp concentration detection device is the internal rotating concentration sensor. The measurement principle is to use the shear force generated by the rotating blades in the pulp to calculate the pulp concentration according to the magnitude of the shear force. On the one hand, this type of detection device is large in size and weighs more than 10 kilograms. It requires a large measuring tube to change its diameter before it can be connected to the pulp pipe, which makes installation and use inconvenient and affects the normal flow of pulp. In addition, the motor is required to continuously drive the blades to rotate, and the motor power reaches more than 300 watts, which consumes a lot of energy and has the problem of low production efficiency.

[0004] On the other hand, the shear force of this type of detection device is greatly affected by the pulp flow rate, pressure and temperature; in addition, the detection blade is subjected to long-term friction by pulp impurities, and the friction coefficient changes, resulting in larger errors in the detection results and reduced accuracy; and when the concentration is lower than 1%, the friction force is too small to be detected; when the concentration is higher than 10%, the rotational resistance is too high, causing the blade or blade support to deform and unable to be used normally, resulting in a limited detection range and weak adaptability. Utility Model Content

[0005] The purpose of the utility model is to address the problems in the prior art of using rotating blades to detect pulp concentration, such as the shear force of the blades being affected by many factors and the change in the friction coefficient, which leads to large errors in the detection results and reduced accuracy. The utility model provides a slurry concentration detection device for pulp concentration detection, comprising: a shielding shell, a radio frequency generator, a transmitting antenna, a receiving antenna, a temperature probe and a control system;

[0006] The radio frequency generator and the transmitting antenna are arranged in the shielding shell; the receiving antenna is fixed to the outside of the shielding shell by a fixing member and is opposite to the transmitting antenna, and can be extended into the slurry to receive the radio frequency signal transmitted by the transmitting antenna;

[0007] A ceramic sealing cover is provided on one side of the shielding shell adjacent to the receiving antenna; the ceramic sealing cover is located between the transmitting antenna and the receiving antenna and is capable of sealing the transmitting antenna within the shielding shell; a ceramic radome is provided on the outside of the receiving antenna, and the ceramic radome is sealed and connected to the fixing member;

[0008] The temperature probe is fixed on the outside of the shielding shell; the radio frequency generator, the transmitting antenna and the receiving antenna are all controlled by the control system through electrical signal connections.

[0009] The solution of the utility model is to set up a radio frequency generator and a transmitting antenna, and then control the radio frequency generator to generate electromagnetic waves through the radio frequency controller in the control system, so that the transmitting antenna transmits electromagnetic waves to the receiving antenna, and the receiving antenna can extend into the slurry, so that the electromagnetic waves received by the receiving antenna are electromagnetic waves transmitted from the slurry. According to the propagation principle of electromagnetic waves, the dielectric constant of the medium affects the propagation rate of the electromagnetic waves. When detecting slurries of different concentrations, the time it takes for the receiving antenna to receive the electromagnetic wave signal is different; since the distance between the transmitting antenna and the receiving antenna remains unchanged, that is, the propagation distance of the electromagnetic wave remains unchanged, the propagation speed of the electromagnetic wave in water is controlled by the receiving antenna. The sowing rate and water concentration are taken as known quantities, and combined with the real-time temperature of the slurry measured by the temperature probe, the real-time measured slurry concentration can be calculated through the calculation module of the control system, thereby realizing non-destructive detection of the slurry concentration; the outside of the transmitting antenna and the receiving antenna are sealed by a ceramic sealing cover and a ceramic antenna cover respectively to prevent the antenna from contacting the slurry itself. The concentration detection is not affected by the friction of the slurry contact, and the antenna will not be worn or deformed, thereby improving the accuracy of the concentration detection; and the detection can be realized by installing the device on the slurry pipe. It is easy to install and use, has low energy consumption, and improves production efficiency.

[0010] Preferably, in the slurry concentration detection device described in the present invention, the shielding shell is cylindrical, the ceramic antenna cover is a ceramic tube, and the axial direction of the ceramic tube is parallel to the radial direction of the shielding shell.

[0011] In order to prevent the slurry flow from impacting components such as the radio frequency generator and the transmitting antenna when using this device, it is necessary to make the slurry flow direction parallel to the radial direction of the shielding shell. As a preferred solution of the present invention, by setting the ceramic antenna cover as a ceramic tube, and the axial direction of the ceramic tube is parallel to the radial direction of the shielding shell, the slurry flow direction is parallel to the axial direction of the ceramic tube, which can further reduce the impact force of the slurry on the ceramic tube due to the flow. On the one hand, it reduces the signal fluctuation caused by the slurry flow of precision devices such as the receiving antenna, further improving the detection accuracy. On the other hand, it reduces the damage to the ceramic tube caused by the impact of the slurry flow, reduces the failure rate, and extends the service life of the device.

[0012] Preferably, in the slurry concentration detection device described in the present invention, the fixing part is in an inverted T-shape, and the vertical end of the fixing part is sealed and connected to the lower end of the shielding shell; the receiving antenna is fixed to the horizontal end of the fixing part; the electrical signal connection line of the receiving antenna is arranged inside the fixing part, and a sealed shell is provided on the outside of the fixing part.

[0013] As a preferred solution of the present invention, by setting the fixing part to be in an inverted T shape and fixing the receiving antenna at the lateral end, it is beneficial to extend the receiving antenna into a container such as a slurry pipe on the basis of enhancing the firmness, thereby avoiding damage to the receiving antenna and the ceramic antenna cover when they are extended and placed. At the same time, a sealed shell is provided on the outside of the fixing part to avoid corrosion and damage to the connecting wire of the fixing part and the receiving antenna inside the fixing part by the slurry, thereby further enhancing the durability of the device and extending its service life.

[0014] Preferably, the slurry concentration detection device described in the present invention also includes a clamp and a pipe joint; the pipe joint can be welded to the slurry circulation pipe; the clamp is used to seal the shielding shell to the pipe joint, so that the receiving antenna can be extended into the circulation pipe.

[0015] As a preferred solution of the present invention, a pipe joint is provided, an opening is made on the slurry pipe, the pipe joint is welded to the opening of the slurry pipe, and then the shielding shell and the transmitting antenna, receiving antenna and other components are sealed and installed on the pipe joint through a clamp. Therefore, it can be applied to slurry concentration detection in various scenarios, and is convenient to install and use, especially for pulp concentration detection, without affecting the transportation of pulp and other normal processes, further improving the convenience of use of the device and enhancing its applicability.

[0016] Preferably, in the slurry concentration detection device described in the present invention, the shielding shell is provided with a circular detection window on the end face adjacent to the receiving antenna, the center of the detection window, the transmitting antenna and the receiving antenna are in the same straight line; the ceramic sealing cover can be sealed and covered on the detection window.

[0017] As a preferred solution of the present invention, a detection window is provided, and the ceramic sealing cover can be sealed and covered on the detection window, so that the radio frequency electromagnetic waves are transmitted only through the detection window. The ceramic sealing cover covers the detection window, so that the surrounding area of the detection window is a shielding part, which reduces the cross interference of the radio frequency electromagnetic signal and further improves the accuracy of the detection.

[0018] Preferably, in the slurry concentration detection device described in the present invention, the detection window is a circular window, and the length of the ceramic antenna cover is less than or equal to the diameter of the detection window.

[0019] As a preferred solution of the present invention, by setting the detection window as a circular window and the length of the ceramic antenna cover is less than or equal to the diameter of the detection window, the loss of the radio frequency electromagnetic signal is reduced, and the receiving antenna can always be located within the coverage range of the ceramic sealing cover, avoiding the occurrence of receiving signal offset due to slight misalignment in the installation, further reducing the failure rate of the device, improving the effectiveness of detection, and further improving production efficiency.

[0020] Preferably, in the slurry concentration detection device described in the present invention, the control system includes: a power box and a control box; the power box is used to supply power and can convert alternating current into direct current; the control box is used to control the operation of the radio frequency generator, transmitting antenna, receiving antenna and temperature probe, as well as the single-chip microcomputer data processing system.

[0021] As a preferred solution of the present invention, by setting the control system as a power box and a control box, power can be supplied to the RF generator, the transmitting antenna, the receiving antenna and the control box through the fuse box and the terminal blocks of the power box, thereby cooperating with the work of the control box and other components, and performing power conversion through the power module to provide a stable power supply with low energy consumption, thereby improving the stability of the use of the device and further reducing energy consumption; the control box controls the operation of the RF generator, the transmitting antenna and the receiving antenna through the RF controller in the control box, so that the device can operate intelligently, and the power supply circuit and the execution signal circuit do not affect each other, thereby improving the durability of the device and enhancing the intelligence of the use of the device.

[0022] Preferably, in the slurry concentration detection device described in the present invention, the control box specifically further includes: a current-voltage converter, a human-computer interaction display screen and a signal converter; the current-voltage converter is used for mutual conversion between voltage signals and current signals; the human-computer interaction display screen is used for obtaining setting parameters and displaying detection data; the signal converter is used for converting the voltage signal into a digital signal.

[0023] As a preferred solution of the present invention, the control box features a human-machine interactive display screen that facilitates user operation and parameter setting, and intelligently acquires test data, enhancing the user experience. A current-to-voltage converter converts the current signal input from the probe device into a voltage signal, achieving precise conversion of current and voltage signals. In conjunction with a single-chip microcomputer processing system, the voltage signal can be converted into a digital signal. The control system's calculation module calculates the high-precision digital signal data to accurately derive concentration data, further improving the device's detection accuracy. Concentration data is displayed locally on an LED screen, converted into a voltage signal, and then output via a voltage-to-current converter, producing a 4-20mA output for the DCS system.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0025] 1. Electromagnetic waves are generated by a radio frequency generator, and are transmitted and received by a transmitting antenna and a receiving antenna, respectively. The propagation rate of electromagnetic waves in water and the concentration of water can be used as known quantities, and the real-time temperature of the slurry measured by the temperature probe can be combined with the calculation module of the control system to calculate the real-time concentration of the slurry, thereby realizing non-destructive detection of the slurry concentration.

[0026] 2. The exterior of the transmitting antenna and the receiving antenna are sealed by a ceramic sealing cover and a ceramic antenna cover respectively, preventing the antenna from contacting the slurry itself. The concentration detection is not affected by the friction of the slurry contact, and the antenna will not be worn or deformed, thereby improving the accuracy of concentration detection;

[0027] 3. The device has no moving parts and wearing parts, and the failure rate is greatly reduced.

[0028] 4. The device can be installed on the slurry pipe to achieve detection. It is light in weight, easy to install and use, has low energy consumption, saves costs and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0030] Figure 2 yes Figure 1 Cross-sectional view along line AA;

[0031] Figure 3 This is a schematic diagram of the state of the utility model connected to the circulation pipeline;

[0032] Figure 4 It is a bottom view of the utility model;

[0033] Icons: 1. Shielding shell; 11. Clamp; 12. Pipe joint; 13. Flow pipe; 2. RF generator; 3. Transmitting antenna; 4. Receiving antenna; 5. Temperature probe; 6. Fixing part; 7. Ceramic sealing cover; 8. Ceramic antenna cover. DETAILED DESCRIPTION

[0034] The present invention will be described in detail below with reference to the accompanying drawings.

[0035] refer to Figure 1 and Figure 2As shown, the utility model provides a slurry concentration detection device, comprising: a shielding shell 1, a radio frequency generator 2, a transmitting antenna 3, a receiving antenna 4, a temperature probe 5 and a control system; the radio frequency generator 2 and the transmitting antenna 3 are arranged in the shielding shell 1; the receiving antenna 4 is fixed to the outside of the shielding shell 1 by a fixing member 6, and is opposite to the transmitting antenna 3, and can thus extend into the slurry to receive the radio frequency signal transmitted by the transmitting antenna 3; a ceramic sealing cover 7 is provided on the side of the shielding shell 1 adjacent to the receiving antenna 4; the ceramic sealing cover 7 is located between the transmitting antenna 3 and the receiving antenna 4, and can seal the transmitting antenna 3 in the ceramic sealing cover 7 inside the shielding shell 1; a ceramic antenna cover 8 is provided on the outside of the receiving antenna 4, and the ceramic antenna cover 8 is sealed to the fixing member 6; the temperature probe 5 is fixed to the outside of the shielding shell 1; the radio frequency generator 2, the transmitting antenna 3 and the receiving antenna 4 are all controlled by the control system through electrical signal connections.

[0036] In this embodiment, the specific functional modules, the shielding shell 1, the RF generator 2, the transmitting antenna 3, the receiving antenna 4 and the temperature probe 5 are installed on the slurry pipe as a whole probe device, and the control system can be configured to include: a power box and a control box; the power box is used for power supply and can convert AC power into DC power; it should be noted that the control box and the power box can be installed on the accessory wall at a convenient location for operation. The control system may include a single-chip microcomputer system, a control circuit and an RF controller, which are commonly used control circuit boards and power-on control terminals. The control system is no longer specifically shown in the figure.

[0037] The probe device is equipped with a radio frequency controller, a radio frequency generator, a radio frequency signal amplifier, a radio frequency signal processor, and a 0-2mA signal converter. The radio frequency controller controls the radio frequency generator 2 through a serial interface bus. Through key operation, the radio frequency controller realizes the setting of the working frequency and the radio frequency output power. The working frequency can be within 20GHz, which is conducive to any band of signal transmission in pulp, and the radio frequency power is within 0-20dbm.

[0038] The power supply box of the utility model includes an air switch, a leakage protector, a fuse box, a power module, and a wiring terminal; the air switch and the leakage protector control the loading or cutting off of the 220V power supply, and the power module converts the 220V AC power supply into a 15V DC power supply, and supplies power to the probe device through the fuse box and the wiring terminal.

[0039] In this embodiment, specifically, the control box includes: a current-voltage converter, a human-computer interaction display screen and a signal converter; the current-voltage converter is used for mutual conversion between voltage signals and current signals; the human-computer interaction display screen is used for obtaining setting parameters and displaying detection data; the signal converter is used for converting voltage signals into digital signals.

[0040] More specifically, for example, the control box includes a current-voltage converter, buttons, an LED display, a single-chip microcomputer system, and a 4-20mA converter. The single-chip microcomputer system is composed of an STM32Fxxx and includes a 16-bit AD converter and a 12-bit DA converter. The 16-bit AD converter collects the signal output by the probe and converts it into a digital signal for processing. The single-chip microcomputer system uses buttons to enable human-computer interaction, input calibration parameters, set system operating parameters, save set parameters, and record historical data. The buttons consist of five keys: up, down, left, right, and middle. To operate, first press the middle button to enter the login interface, enter the login password, and then press the middle button to enter the parameter page. Parameters are set by moving the cursor with the left and right buttons or the up and down buttons, and then using the middle button to adjust the settings.

[0041] The specific working process of the device is as follows: the RF controller initializes the RF generator 2 according to the set parameters, downloads the working parameters, starts the RF generator 2, and tracks the working status of the RF generator 2 in real time. The RF generator 2 generates an RF signal of a certain power, which is divided into two paths through a splitter. The first RF signal is transmitted by the transmitting antenna 3 to one end of the receiving antenna 4, and the second RF signal is directly fed into the RF signal processor; after the first RF signal is transmitted by the transmitting antenna 3, it is transmitted into the pulp and reaches the receiving antenna 4. After being received by the receiving antenna 4, it is amplified by the amplifier and fed into the RF signal processor. The RF signal processor generates a corresponding voltage signal based on the time difference between the reception and arrival of the first RF signal and the second RF signal, and generates a current output signal I1 through a 0-2mA signal converter; synchronously, the temperature signal measured by the temperature probe 5 also passes through the 0-2mA signal converter to generate a current output signal I2.

[0042] It should be noted that the current-voltage converter converts the current signal I1 into a 0-3V voltage signal, enters the single-chip microcomputer system for processing, and the 16-bitAD converter converts it into a digital signal t1 and saves it in real time; t0 in calculation formula one is obtained through factory calibration. For example, the device needs to detect the voltage signal related to the radio frequency signal in water with a concentration of 0% at the factory, and generate a current output signal I0 through a 0-2mA signal converter; the signal value t0 is obtained as a reference through the single-chip microcomputer processing system of the control box and saved in the control system. During use, the pulp concentration is calculated based on t0 as a reference.

[0043] It should also be noted that the voltage signal I2 output by the temperature probe 5 is converted into a 0-3V voltage signal by a current-voltage converter, and then converted into a corresponding digital signal value by the same digital-to-analog converter. According to the corresponding standard table of digital signal values and temperatures, the current temperature T1 can be obtained. The T0 in the calculation formula 1 is obtained by synchronous calibration at the factory calibration time t0.

[0044] The calibration of k1 in the calculation formula 1 is obtained by taking the average value after multiple tests at the same pulp concentration and different pulp temperatures to obtain the ratio of the temperature change to the concentration change value; similarly, the k in the calculation formula 1 is obtained by testing pulps of different concentrations at the same temperature.

[0045] More specifically, the display screen uses a 2.42-inch LED display screen with a resolution of 128X64, and communicates with the microcontroller system through the SPI serial port to display the measurement results and the interface display during human-computer interaction.

[0046] Specifically, refer to Figure 3 As shown, the utility model is used for online detection of pulp concentration or concentration of other slurry flowing in pipes, and can be configured to include a clamp 11 and a pipe joint 12; the pipe joint 12 can be welded to the slurry circulation pipe 13; the clamp 11 is used to seal the shielding shell 1 to the pipe joint 12, so that the receiving antenna 4 can be extended into the circulation pipe 13; more specifically, the probe device is connected to the pulp pipe through the DN80 copy forest clamp 11, and the pulp pipe is provided with a pipe joint 12 with a DN80 copy forest clamp 11 welded thereon, the pipe joint 12 is 32 mm higher than the pulp pipe, a special sealing ring is put on the pipe joint 12, and the probe device is inserted to make the receiving antenna 4 extend into the pulp pipe, ensuring that the ceramic sealing cover and the ceramic antenna cover are filled with slurry, and then adjust the position of the sealing ring so that the sealing ring evenly covers the interface of the pipe joint 12; install the clamp 11 and lock it with bolts.

[0047] It should be noted that the probe device has a stainless steel supporting shell, the detection window has a ceramic sealing cover 7, a ceramic antenna cover 8, and the upper end of the temperature probe 5 is a shielding shell and cable connector and other components, which can achieve external shielding of electromagnetic waves and prevent slurry from invading the inside of the probe device.

[0048] In this embodiment, specifically, refer to Figure 4 As shown, the shielding shell 1 is cylindrical, and the ceramic antenna cover 8 is a ceramic tube, and the axial direction of the ceramic tube is parallel to the radial direction of the shielding shell 1.

[0049] More specifically, the fixing member 6 is in an inverted T shape, and the vertical end of the fixing member 6 is sealed and connected to the lower end of the shielding shell 1; the receiving antenna 4 is fixed to the horizontal end of the fixing member 6; the electrical signal connection line of the receiving antenna 4 is arranged inside the fixing member 6, and a sealed shell is provided outside the fixing member 6.

[0050] In this embodiment, specifically, refer to Figure 4 As shown, a circular detection window is provided on the end face of the shielding shell adjacent to the receiving antenna 4, and the center of the detection window, the transmitting antenna 3 and the receiving antenna 4 are in the same straight line; the ceramic sealing cover 7 can be sealed and covered on the detection window.

[0051] In this embodiment, specifically, the detection window is a circular window, and the length of the ceramic antenna cover 8 is less than or equal to the diameter of the detection window.

[0052] Pulp is a mixture primarily composed of fiber, water, and other additives. Pulp concentration refers to the percentage of solids in the pulp and can be calculated using the following formula: Concentration = (Pulp Solids Content / Total Pulp Weight) × 100%. Pulp primarily consists of fiber and water. Concentration can be measured using two methods: oven drying and concentration meter testing. The oven drying method involves taking a sample with a measuring cup and weighing it to determine the weight of the sample. The pulp sample is then oven dried at a constant temperature to a constant weight, obtaining the weight of the solid fraction. The ratio of the solid fraction to the original sample weight is then calculated. However, the oven drying method is used for spot checks on production lines and cannot be used for online testing. Online testing can only be achieved using a concentration meter.

[0053] Implementation method of the present invention: Since the propagation speed of electromagnetic waves depends on the dielectric constant of the medium, the speed of electromagnetic wave transmission is inversely proportional to the square root of the dielectric constant, and the dielectric constant of water is usually 78.5; depending on the pulp concentration, the dielectric constant is between 1-78.5, and the dielectric constant is low when the concentration is high, and the dielectric constant is high when the concentration is low; therefore, the propagation speed of electromagnetic waves is fast when the pulp concentration is high, and the propagation speed of electromagnetic waves is slow when the concentration is low. The pulp concentration can be calculated based on the difference in the propagation time of electromagnetic waves in pulp and water; for example, referring to setting the water concentration to 0, the transmission time of the electromagnetic wave emitted by the transmitting antenna 3 in water is t0; when the concentration of the slurry or pulp is C, the transmission time of the electromagnetic wave in the slurry or pulp is t1.

[0054] According to the above principle of electromagnetic wave propagation in slurry, the concentration calculation formula of slurry can be obtained as follows:

[0055] C=k(t1-t0)+k1(T1-T0),

[0056] In calculation formula 1, k is the slope, t0 is calibrated and saved at the factory, k1 is the compensation slope, T1 is the temperature of the pulp during online detection, and T0 is the pulp temperature at the calibration time; the advantages of using the utility model for measurement are reliable detection results, sensitive response, insensitivity to flow rate, and ability to be calibrated at a single point.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A slurry concentration detection device, characterized in that: include: Shielding shell (1), radio frequency generator (2), transmitting antenna (3), receiving antenna (4), temperature probe (5) and control system; The radio frequency generator (2) and the transmitting antenna (3) are arranged in the shielding shell (1); the receiving antenna (4) is fixed to the outside of the shielding shell (1) through a fixing member (6) and is opposite to the transmitting antenna (3), so as to be able to extend into the slurry to receive the radio frequency signal transmitted by the transmitting antenna (3); The shielding shell (1) is provided with a ceramic sealing cover (7) on one side adjacent to the receiving antenna (4); the ceramic sealing cover (7) is located between the transmitting antenna (3) and the receiving antenna (4), and is capable of sealing the transmitting antenna (3) within the shielding shell (1); a ceramic antenna cover (8) is provided on the outside of the receiving antenna (4), and the ceramic antenna cover (8) is sealed and connected to the fixing member (6); The temperature probe (5) is fixed to the outside of the shielding shell (1); the radio frequency generator (2), the transmitting antenna (3) and the receiving antenna (4) are all controlled by the control system through electrical signal connections.

2. The slurry concentration detection device according to claim 1, characterized in that: The shielding shell (1) is cylindrical, the ceramic antenna cover (8) is a ceramic tube, and the axial direction of the ceramic tube is parallel to the radial direction of the shielding shell (1).

3. The slurry concentration detection device according to claim 1, characterized in that: The fixing member (6) is in an inverted T-shape, and the vertical end of the fixing member (6) is sealed and connected to the lower end of the shielding shell (1); the receiving antenna (4) is fixed to the horizontal end of the fixing member (6); the electrical signal connection line of the receiving antenna (4) is arranged inside the fixing member (6), and a sealed shell is arranged outside the fixing member (6).

4. The slurry concentration detection device according to claim 1, characterized in that: It also includes a clamp (11) and a pipe joint (12); the pipe joint (12) can be welded to a slurry circulation pipe (13); the clamp (11) is used to seal the shielding shell (1) to the pipe joint (12), thereby enabling the receiving antenna (4) to extend into the circulation pipe (13).

5. The slurry concentration detection device according to claim 1, characterized in that: The shielding shell (1) is provided with a circular detection window on the end surface adjacent to the receiving antenna (4), and the center of the detection window, the transmitting antenna (3) and the receiving antenna (4) are in the same straight line; the ceramic sealing cover (7) can be sealed and covered on the detection window.

6. The slurry concentration detection device according to claim 5, characterized in that: The detection window is a circular window, and the length of the ceramic antenna cover (8) is less than or equal to the diameter of the detection window.

7. The slurry concentration detection device according to any one of claims 1 to 6, characterized in that: The control system comprises: a power box and a control box; the power box is used to supply power and can convert alternating current into direct current; the control box is used to control the operation of the radio frequency generator (2), the transmitting antenna (3), the receiving antenna (4) and the temperature probe (5).

8. The slurry concentration detection device according to claim 7, characterized in that: The control box specifically includes: a current-voltage converter, a human-computer interaction display screen and a signal converter; the current-voltage converter is used for mutual conversion between voltage signals and current signals; the human-computer interaction display screen is used for obtaining setting parameters and displaying detection data; the signal converter is used for converting the voltage signal into a digital signal.

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