A detection device and method for controlling the settling of ceramic slip

Abstract

The application discloses a kind of detection device and method for controlling ceramic slurry settlement, including the upper computer connected in turn, signal control module, ultrasonic module and slurry container;The upper computer is used to send characteristic wave acquisition instruction to signal control module, receives signal mean value calculation and obtains the settlement height of ceramic slurry in slurry container, and sends stirring instruction to slurry container according to settlement height;Signal control module is used to send ultrasonic wave start instruction to ultrasonic module according to characteristic wave acquisition instruction, collects ultrasonic echo signal, calculates the signal mean value of ultrasonic echo signal, and sends to the upper computer;Ultrasonic module is used to emit ultrasonic signal and receive ultrasonic echo signal to slurry container according to ultrasonic wave start instruction;The application can carry out real-time monitoring and detection to the stirring process of ceramic slurry, and the settlement in slurry mixing process is calculated quickly and accurately, so as to adjust stirring condition in time, prevent slurry failure caused by excessive slurry settlement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ceramic slurry detection, in particular to a detection device and method for controlling ceramic slurry sedimentation. BACKGROUND

[0002] Currently, common detection methods for ceramic slurry sedimentation include sedimentation observation, Zeta potential method, rheological test method, multiple light scattering method and gamma ray test method, etc. For example, the Zeta potential method is to measure the size of the particle surface Zeta potential to evaluate the dispersion stability of the dispersion system. According to the classical double electric layer theory, the farther from the Zeta potential isoelectric point, the greater the repulsive force between the particles in the slurry, the more stable the slurry, and the smaller the viscosity. The rheological test method needs to stir the slurry before detection, and needs to calculate multiple parameters such as apparent viscosity, plastic viscosity, apparent shear force, etc. during the detection process, and also needs to perform operations such as filtration loss determination, speed conversion, hysteresis circle drawing, etc. These detection methods can obtain the state information of the ceramic slurry to some extent, but all the above methods have a common problem, that is, it is difficult to obtain a numerical expression of the slurry state as a whole while ensuring the measurement accuracy and meeting the timeliness, and the evaluation cost is high. SUMMARY

[0003] In order to solve the above technical problems, the present application provides a detection device and method for controlling ceramic slurry sedimentation. The ceramic slurry is detected by an ultrasonic transducer, and the slurry container is adjusted according to the calculated sedimentation height data of the ceramic slurry to prevent slurry failure caused by excessive slurry sedimentation. The ceramic slurry can be quickly and accurately analyzed for sedimentation, which is not only convenient to apply, but also accurate and efficient in detection results.

[0004] In a first aspect, the present application provides a detection device for controlling ceramic slurry sedimentation, comprising:

[0005] a host computer, a signal control module, an ultrasonic module and a slurry container connected in sequence;

[0006] The host computer is configured to send a characteristic wave acquisition instruction to the signal control module, receive a signal mean value sent by the signal control module, calculate a sedimentation height of the ceramic slurry in the slurry container according to the signal mean value, and send a stirring instruction to the slurry container according to the sedimentation height.

[0007] The signal control module is configured to send an ultrasonic wave start instruction to the ultrasonic module according to the received characteristic wave acquisition instruction, collect an ultrasonic echo signal, calculate a signal mean value of the ultrasonic echo signal, and send the signal mean value to the host computer.

[0008] The ultrasonic module is configured to emit ultrasonic signals to the slurry container and receive ultrasonic echo signals according to the received ultrasonic starting instruction.

[0009] The slurry container is configured to hold ceramic slurry and stir the ceramic slurry according to the received stirring instruction.

[0010] Further, the signal control module comprises a characteristic wave algorithm module, a storage module and a signal conditioning module connected with each other.

[0011] The characteristic wave algorithm module is configured to divide the collected ultrasonic echo signals into time points according to an ultrasonic quantity threshold, delete abnormal data, accumulate amplitudes and calculate average values of the ultrasonic echo signals in the time points, obtain echo signal averages of the time points, and send the echo signal averages to the signal conditioning module.

[0012] The signal conditioning module is configured to amplify, filter and analog-digital convert the received echo signal averages, generate signal averages, and send the signal averages to the storage module.

[0013] The storage module is configured to store the ultrasonic echo signals and the signal averages.

[0014] Further, the upper computer comprises a sedimentation height calculation module.

[0015] The sedimentation height calculation module is configured to calculate a solid volume concentration of the ceramic slurry according to the signal averages, calculate an average rate of collecting the ultrasonic echo signals by the signal control module, calculate a sediment layer solid mass of the ceramic slurry according to the solid volume concentration and the average rate, and calculate a sedimentation height of the ceramic slurry according to the sediment layer solid mass.

[0016] Further, the ultrasonic module comprises a first ultrasonic transducer, a second ultrasonic transducer, a first metal plate and a second metal plate.

[0017] The first ultrasonic transducer is arranged on an outer wall of one side of the slurry container.

[0018] The first metal plate is arranged on an outer wall of the other side of the slurry container, and the position of the first metal plate corresponds to the position of the first ultrasonic transducer.

[0019] The second ultrasonic transducer is arranged above the slurry container, at the same height as the liquid surface of the ceramic slurry, and vertically to the center of the bottom surface of the slurry container.

[0020] The second metal plate is arranged on the inner wall of the bottom of the slurry container, and the shape of the second metal plate is matched with the shape of the inner wall of the bottom.

[0021] Further, the solid volume concentration is calculated by the following formula:

[0022]

[0023] In the formula, ρ s is the density of the powder particles in the ceramic slurry, ρ w is the density of the aqueous solution in the ceramic slurry, C0 is the signal average of the first ultrasonic transducer at a time point, and C1 is the signal average of the second ultrasonic transducer at a time point.

[0024] The average rate is calculated by the following formula:

[0025] N = β (α s ρ m ) n exp (-α s ρ m )

[0026] In the formula, β is a calibration constant, ρ m is the density of the uniformly mixed ceramic slurry;

[0027] The solid mass of the deposited layer is calculated by the following formula:

[0028]

[0029] In the formula, α s0 is the solid volume concentration of the ceramic slurry obtained by the first ultrasonic transducer, and α s1 is the solid volume concentration of the ceramic slurry obtained by the second ultrasonic transducer.

[0030] The settling height is calculated by the following formula:

[0031]

[0032] In the formula, s is the area of the bottom of the slurry container.

[0033] Further, the outer side of the slurry container is provided with a circulating pipeline and a volume pump;

[0034] The circulating pipeline is vertically arranged on the outer wall of the slurry container, and the two ends of the circulating pipeline are respectively connected to the interior of the slurry container, and the volume pump is arranged on the circulating pipeline.

[0035] In a second aspect, the application provides a detection method for controlling the settling of ceramic slurry, which comprises:

[0036] generate an ultrasonic wave starting instruction according to the characteristic wave acquisition instruction, so that the ultrasonic wave module emits an ultrasonic wave signal to the slurry container and receives an ultrasonic echo signal;

[0037] acquire the ultrasonic echo signal and calculate a signal mean value of the ultrasonic echo signal;

[0038] calculate a sedimentation height of the ceramic slurry in the slurry container according to the signal mean value;

[0039] generate a stirring instruction according to the sedimentation height, and stir the ceramic slurry.

[0040] Further, the step of calculating the signal mean value of the ultrasonic echo signal comprises:

[0041] divide the acquired ultrasonic echo signal into time points according to an ultrasonic wave quantity threshold, and perform abnormal data deletion, amplitude accumulation and average value calculation on the ultrasonic echo signal in the time points to obtain an echo signal mean value of each time point;

[0042] amplify, filter and analog-digital convert the echo signal mean value to generate a signal mean value.

[0043] Further, the step of calculating the sedimentation height of the ceramic slurry in the slurry container according to the signal mean value comprises:

[0044] calculate a solid volume concentration of the ceramic slurry in the slurry container according to the signal mean value, and calculate an average rate of receiving the ultrasonic echo signal according to the solid volume concentration;

[0045] calculate a sediment layer solid mass of the ceramic slurry according to the solid volume concentration and the average rate, and calculate the sedimentation height of the ceramic slurry according to the sediment layer solid mass.

[0046] Further, the solid volume concentration is calculated by using the following formula:

[0047]

[0048] In the formula, ρ s is the density of the powder particles in the ceramic slurry, ρ w is the density of the aqueous solution in the ceramic slurry, C0 is the signal mean value of the first ultrasonic wave transducer at a time point, and C1 is the signal mean value of the second ultrasonic wave transducer at a time point.

[0049] The average rate is calculated by using the following formula:

[0050] N = β (α s ρm ) n exp(-α s ρ m )

[0051] wherein β is a calibration constant, ρ m is the density of the homogenously mixed ceramic slurry;

[0052] The solid mass of the deposited layer is calculated using the following formula:

[0053]

[0054] wherein α s0 is the solid volume concentration of the ceramic slurry obtained by the first ultrasonic transducer, and α s1 is the solid volume concentration of the ceramic slurry obtained by the second ultrasonic transducer;

[0055] The settling height is calculated using the following formula:

[0056]

[0057] wherein s is the area of the bottom of the slurry container.

[0058] The present application provides a detection device and method for controlling the settling of ceramic slurry. Through the device, real-time monitoring of the ceramic slurry can be achieved, and rapid and accurate settling analysis of the ceramic slurry can be performed, thereby providing real-time feedback on the status information during the slurry mixing process. The device is not only convenient to use, but also efficient and accurate in detection, and can meet the actual needs of the development of the MLCC industry. BRIEF DESCRIPTION OF DRAWINGS

[0059] Figure 1 is a structural schematic diagram of the detection device for controlling the settling of ceramic slurry in the embodiment of the present application;

[0060] Figure 2 is another structural schematic diagram of the detection device for controlling the settling of ceramic slurry in the embodiment of the present application;

[0061] Figure 3 is a conditioning circuit diagram of the signal conditioning module 2 in Figure 1 ;

[0062] Figure 4 is a schematic diagram of the signal conditioning module 2 in Figure 1 for time point division and waveform selection;

[0063] Figure 5 is a flowchart of the detection method for controlling the settling of ceramic slurry in the embodiment of the present application. DETAILED DESCRIPTION

[0064] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0065] Please refer to Figure 1 The first embodiment of the present application provides a detection device for controlling ceramic slurry sedimentation, which comprises: a host computer 1, a signal control module 2, an ultrasonic module 3 and a slurry container 4 connected in sequence. The host computer 1 is used for sending control instructions and performing ceramic slurry sedimentation analysis, including sending characteristic wave acquisition instructions to the signal control module 2, sending stirring instructions to the slurry container, and calculating the sedimentation height of the ceramic slurry according to the signal mean value generated by the signal control module 2, etc. The signal control module 2 is used for controlling the ultrasonic module 3 to emit ultrasonic signals and receive ultrasonic echo signals to the slurry container 4 according to the received characteristic wave acquisition instructions, collecting and calculating the signal mean value of the ultrasonic echo signals, and sending the signal mean value to the host computer 1. The ultrasonic module 3 is used for emitting ultrasonic signals and receiving ultrasonic echo signals to the slurry container 4 according to the start-up instructions. The slurry container 4 is used for containing ceramic slurry and stirring the ceramic slurry according to the stirring instructions.

[0066] Please refer to Figure 2 The preferred detection device provided by the present application is shown in the structural schematic diagram, and the detection process of the detection device will be described in detail below. Figure 2 The detection process of the detection device will be described in detail below.

[0067] The slurry container 4 is used for containing ceramic slurry, and the solvent of the ceramic slurry is water with a mass solid content of 0.01wt%-99.99wt%. The ceramic slurry to be measured is composed of ceramic powder, solvent, binder, plasticizer, dispersant and other components, and is an organic substance with general gel-like properties, which can be dissolved or swollen in water or organic solvent, and can form a thick and plastic paste-like substance. A circulating pipeline 5 is vertically arranged on the outer wall of the slurry container 4, both ends of the circulating pipeline 5 are connected with the inside of the slurry container 4, and a volumetric pump 6 is further arranged on the circulating pipeline 5. The ceramic slurry in the slurry container 4 can be stirred through the circulating pipeline 5 and the volumetric pump 6.

[0068] The shape of the slurry container 4 can be a cylinder, a cuboid or other regular shape. In this embodiment, the shape and numerical values are preferred but not limited. The shape and numerical values can be set flexibly according to actual conditions. Devices with the same or similar functions can be applied to the present application. The subsequent description will not be repeated.

[0069] The ultrasonic module 3 is arranged outside the slurry container 4. In this preferred embodiment, the ultrasonic module 3 includes a first ultrasonic transducer 31, a second ultrasonic transducer 32, a first metal plate 33 and a second metal plate 34. The first ultrasonic transducer 31 is arranged on the outer wall of one side of the slurry container 4, for example, at one fourth of the horizontal height of the slurry container 4. The first metal plate 33 for reflecting ultrasonic waves is arranged on the outer wall of the other side corresponding to the first ultrasonic transducer 31. The second ultrasonic transducer 32 is arranged above the slurry container 4, opposite to the center of the bottom of the container, and the height is the same as the liquid level of the ceramic slurry. The second metal plate 34 corresponding to the second ultrasonic transducer 32 is arranged on the bottom of the slurry container 4, and the size is completely matched with the shape of the bottom.

[0070] The performance parameters of the ultrasonic module 3 are mainly set according to the parameters of the slurry container 4. Assuming that the material of the slurry container 4 is polypropylene carbonate (PPC), the bottom is a circle with a radius of 20-25 cm, and the height is 50-60 cm. Piezoelectric ultrasonic transducers can be selected as the first ultrasonic transducer 31 and the second ultrasonic transducer 32. The first ultrasonic transducer 31 has a radius of 25 mm, a frequency of 5 MHz, a return frequency error of ≤10%, and an internal wafer of ≥20 mm. The first ultrasonic transducer 32 has a radius of 10 mm, a frequency of 2.5 MHz, a return frequency error of ≤10%, and an internal wafer of 20 mm. The first metal plate 33 is made of a metal iron plate with a thickness of 3 mm, and the shape is a square with a side length of 10-15 cm. The second metal plate 34 is made of a metal iron plate with a thickness of 4 mm, and the size is completely matched with the inner wall of the bottom of the slurry container 4.

[0071] The signal control module 2 further comprises a characteristic wave calculation module 21, a signal conditioning module 22 and a storage module 23 connected with each other, wherein the characteristic wave calculation module 21 is used for calculating the signal mean value of the collected ultrasonic echo signal through a characteristic wave algorithm, the characteristic wave algorithm can be input into the signal control module 2 in advance through the upper computer, and the characteristic wave algorithm in the embodiment is used for dividing the ultrasonic echo signal after deleting abnormal data according to an ultrasonic wave quantity threshold, obtaining a plurality of time points, then performing an abnormal deletion operation on the ultrasonic echo signal in each time point, deleting the abnormal data including redundant data and abnormal error data, then performing amplitude accumulation and average value calculation, so as to obtain the echo signal mean value, the calculated echo signal mean value is sent to the signal conditioning module 22, and after amplification, filtering and analog-digital conversion, the generated signal mean value is sent to the storage module 23; and the storage module 23 not only stores the collected ultrasonic echo signal, but also stores the calculated signal mean value, which can be transmitted to the upper computer 1 for analysis of the sedimentation height during detection.

[0072] In the embodiment, the signal conditioning module 22 can be realized by using a conditioning circuit as shown in Figure 3 The output end of the operational amplifier circuit is directly connected with the input end of the low-pass filter circuit, the output end of the low-pass filter circuit is electrically connected with the voltage comparator of the input end of the A / D converter, the digital signal after A / D conversion is stored into the storage module 23, and other functions of the signal control module 2 can be realized by using a core board such as an STM32F429IGT6 development board with an stm32 core, the core of which is a Cortex-M4 chip, and which comprises two 12-bit DACs, three 12-bit ADCs with a speed of 2.4MSPS or 7.2MSPS (interleaved mode), 17 timers: 16 and 32-bit timers with a frequency of up to 168MHz. The functions of ADC1, ADC2, ADC5 and ADC6 in the STM32 accept the AD signal of the driving board, usart1 half-duplex sends data to the esp32, usart full-duplex communicates with the serial screen, usart3 half-duplex accepts the gyroscope data, the software simulates i2c1 to read the temperature sensor data, and the io is reserved for external expansion.

[0073] The upper computer 1 comprises a sedimentation height calculation module 11, which can calculate the solid volume concentration of the ceramic slurry and the average rate of the ultrasonic echo signal collected by the signal control module 2 according to the signal mean value, so as to calculate the sediment layer solid mass of the ceramic slurry, and finally calculate the sedimentation height of the ceramic slurry. The detection process of the detection device in the embodiment will be described in detail in combination with the structural schematic view as shown in Figure 2

[0074] ​First is the initialization process, including the selection of the channel and the zero processing of the parameters, after the initialization is ready, the host computer 1 sends the characteristic wave acquisition instruction to the signal control module 2, the signal control module 2 controls the STM32 to output the sine wave driving signal through the ARM processor, and then through the driving circuit and the transmitting circuit in turn, so that the power is amplified and the driving signal reaches the ultrasonic module 3, so that the first ultrasonic transducer 31 and the second ultrasonic transducer 32 convert the input signal into mechanical vibration to generate ultrasonic waves, at the same time, the signal control module 2 controls the CPU to send the ultrasonic start instruction to generate the excitation signal according to the instruction, and the digital excitation signal synthesized by the DDS technology will be transmitted to the D / A converter, at the same time, the A / D converter will start sampling the ultrasonic echo signal received by the ultrasonic module 3, and the sampling data will be stored in the storage module 23;

[0075] The host computer 1 writes the characteristic wave algorithm into the signal control module 2 in advance, and the CPU starts to analyze the data in the storage module 23, according to the characteristic wave algorithm, the redundant and abnormal error data is removed, the data value of the sampling point after removing the abnormal value of the characteristic wave is obtained, and the mean value of the signal at each time point is obtained according to the algorithm, that is, as shown in the formula (1), a certain number of waves received by the ultrasonic probe is regarded as a time point, for example, every one hundred waves received is regarded as a time point, then the amplitude of the wave at this time point after removing the abnormal data is accumulated and averaged to obtain the mean value of the signal. The calculated signal mean value is amplified, filtered and A / D converted by the signal conditioning module 22 to generate a digital signal and store it in the storage module 23, and the stored signal mean value is transmitted to the host computer 1. Figure 4

[0076] The host computer 1 receives the signal mean value, and processes and analyzes the signal mean value at each time point through the sedimentation height calculation module 11 to determine the sedimentation of the ceramic slurry, that is, the solid volume concentration of the ceramic slurry is calculated according to the mean value signal, and the average rate of the signal control module 2 collecting the ultrasonic echo signal, and then the solid mass of the sediment layer of the ceramic slurry is calculated, so as to obtain the sedimentation height of the ceramic slurry, the specific steps include:

[0077] According to the signal mean value, the density of the mixed uniform ceramic slurry and the average rate of the signal received by the signal control module 2 are represented, and the formula of the density and the average rate is as follows:

[0078]

[0079] N=exp[-dρ m (μ s C+μ w (1-C))]……(2)

[0080] ​Wherein, N is the average rate of signal control module receiving signal, unit is s -1 , μ w is the signal attenuation coefficient of the ultrasonic wave produced by the first ultrasonic transducer penetrating the ceramic slurry and being reflected back by the first metal plate, unit is cm 2 g -1 , ρ s is the density of the powder particles in the ceramic slurry, unit is g / cm 3 , ρ w is the density of the aqueous solution in the ceramic slurry, unit is g / cm 3 , ρ m is the density of the mixed ceramic slurry, unit is g / cm 3 , μ s is the signal attenuation coefficient of the ultrasonic wave produced by the second ultrasonic transducer penetrating the ceramic slurry and being reflected back by the second metal plate, unit is cm 2 g -1 , d is the radius of the slurry container, C0 is the signal average of the first ultrasonic transducer at a time point, C1 is the signal average of the second ultrasonic transducer at a time point, wherein,

[0081]

[0082]

[0083] C k and C k ' are the signal values of a certain waveform of the first ultrasonic transducer and the second ultrasonic transducer, which can be directly read out by the host computer, and n is the total number of waveforms in a time.

[0084] After converting the above two formulas, we can get:

[0085] N = exp[-d(μ s ρ w α s + μ w ρ w α w )] ……(3)

[0086]

[0087]

[0088] Wherein, α s is the volume fraction of the powder particles in the ceramic slurry, α w is the volume fraction of the aqueous solution in the ceramic slurry, and d is the radius of the slurry container.

[0089] Then, the calibration curve of formula 3 can be obtained by simulation according to formulas 4 and 5:

[0090] N = β (α s ρ m ) n exp(-α s ρ m ) …… (6)

[0091] In formula 6, β is a calibration constant, which is 2.716±0.253 when applied to ceramic slurry.

[0092] The solid mass of the deposited layer of the ceramic slurry can be calculated in combination with formula 6:

[0093]

[0094] In formula 7, m a is the solid mass of the deposited layer formed at the bottom of the slurry container, in g, α s0 is the solid volume concentration of the ceramic slurry obtained by the first ultrasonic transducer, and α s1 is the solid volume concentration of the ceramic slurry obtained by the second ultrasonic transducer, wherein:

[0095]

[0096] According to the relationship between mass, volume and density, the following formula 8 can be obtained:

[0097]

[0098] In formula 8, V a is the volume fraction of the deposited layer formed at the bottom of the slurry container.

[0099] According to the relationship between volume and height, the settling height, that is, the height of the deposited layer formed, can be obtained:

[0100]

[0101] In formula 9, s is the area of the bottom of the slurry container.

[0102] Since the shape of the slurry container is a regular shape, for example, a cylindrical shape, formula 8 can be further converted into a relationship with the diameter of the bottom of the slurry container, that is:

[0103]

[0104] In formula 10, h is the height of the deposited layer at the bottom of the slurry container, in cm, and d is the diameter of the slurry container, in cm.

[0105] After the host computer 1 calculates the height data of the ceramic slurry settlement, the staff can independently adjust the rate of the volume pump 6 according to the height data, and stir the ceramic slurry in the slurry container 4 to prevent the slurry from being invalid due to excessive settlement of the slurry.

[0106] The detection device for controlling ceramic slurry settlement provided by the embodiment can simply and conveniently monitor and detect the stirring process of the ceramic slurry in real time, can quickly and accurately calculate the settlement condition in the slurry mixing process, and thus can timely adjust the stirring condition to prevent the slurry from being invalid due to excessive settlement of the slurry, thereby further meeting the actual needs of the development of the MLCC industry.

[0107] Please refer to Figure 5 Based on the same inventive concept, the detection method for controlling ceramic slurry settlement provided by the second embodiment comprises the following steps.

[0108] In step S10, an ultrasonic wave starting instruction is generated according to a characteristic wave acquisition instruction, so that the ultrasonic wave module emits an ultrasonic wave signal to the slurry container and receives an ultrasonic echo signal.

[0109] In step S20, the ultrasonic echo signal is acquired, and a signal mean value of the ultrasonic echo signal is calculated.

[0110] In step S30, a settlement height of the ceramic slurry in the slurry container is calculated according to the signal mean value.

[0111] In step S40, a stirring instruction is generated according to the settlement height, and the ceramic slurry is stirred.

[0112] In step S20, the following steps are included.

[0113] In step S201, the acquired ultrasonic echo signal is divided into time points according to an ultrasonic wave number threshold, and the ultrasonic echo signal in the time points is subjected to abnormal data deletion, amplitude accumulation and average value calculation to obtain an echo signal mean value of each time point.

[0114] In step S202, the echo signal mean value is amplified, filtered and analog-digital converted to generate a signal mean value.

[0115] In step S30, the following steps are included.

[0116] In step S301, a solid volume concentration of the ceramic slurry in the slurry container is calculated according to the signal mean value, and an average rate of receiving the ultrasonic echo signal is calculated according to the solid volume concentration.

[0117] In step S302, the solid mass of the deposited layer of the ceramic slurry is calculated according to the solid volume concentration and the average rate, and the settling height of the ceramic slurry is calculated according to the solid mass of the deposited layer.

[0118] The technical features and technical effects of the detection method for controlling the settling of the ceramic slurry are the same as those of the device, and will not be repeated here. The above-mentioned modules in the detection device for controlling the settling of the ceramic slurry can be realized by software, hardware, or a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory in the computer device in software form, so as to be called and executed by the processor to perform the operations corresponding to the above-mentioned modules.

[0119] In summary, the detection device and method for controlling the settling of the ceramic slurry are provided, and the device comprises a host computer, a signal control module, an ultrasonic module, and a slurry container connected in sequence. The host computer is configured to send a characteristic wave acquisition instruction to the signal control module, receive a signal mean value sent by the signal control module, calculate a settling height of the ceramic slurry in the slurry container according to the signal mean value, and send a stirring instruction to the slurry container according to the settling height. The signal control module is configured to send an ultrasonic wave start instruction to the ultrasonic module according to the received characteristic wave acquisition instruction, collect an ultrasonic echo signal, calculate a signal mean value of the ultrasonic echo signal, and send the signal mean value to the host computer. The ultrasonic module is configured to emit an ultrasonic wave signal to the slurry container and receive an ultrasonic echo signal according to the received ultrasonic wave start instruction. The slurry container is configured to contain the ceramic slurry and stir the ceramic slurry according to the received stirring instruction. The present application can simply and conveniently monitor and detect the stirring process of the ceramic slurry in real time, quickly and accurately calculate the settling condition during the mixing of the slurry, and timely adjust the stirring condition to prevent the failure of the slurry caused by excessive settling of the slurry, thereby further meeting the actual needs of the development of the MLCC industry.

[0120] Each embodiment in the specification is described in a progressive manner, and the same or similar parts of each embodiment can be referred to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the method embodiment, since it is basically similar to the device embodiment, the description is relatively simple, and the relevant parts are described in the part of the device embodiment. It should be noted that, for the sake of brevity of description, not all possible combinations of the technical features of the above-mentioned embodiments are described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the description.

[0121] The above-described embodiments are merely illustrative of several preferred embodiments of the present application, which are described in more detail and in a more specific and detailed manner, but should not be construed as limiting the scope of the patent. It should be noted that for those skilled in the art, several improvements and replacements can be made without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the protection scope of the claims.

Claims

1. A detection device for controlling the settling of ceramic slurry, characterized in that, include: The host computer, signal control module, ultrasonic module, and slurry container are connected in sequence. The host computer is used to send a characteristic wave acquisition command to the signal control module, receive the signal average value sent by the signal control module, calculate the settling height of the ceramic slurry in the slurry container based on the signal average value, and send a stirring command to the slurry container based on the settling height. The signal control module is used to send an ultrasonic start command to the ultrasonic module according to the received characteristic wave acquisition command, acquire ultrasonic echo signals, calculate the signal mean of the ultrasonic echo signals, and send the signal mean to the host computer. The ultrasonic module is used to transmit ultrasonic signals to the slurry container and receive ultrasonic echo signals according to the received ultrasonic start command. The slurry container is used to hold ceramic slurry and to stir the ceramic slurry according to the received stirring command; The ultrasonic module includes a first ultrasonic transducer, a second ultrasonic transducer, a first metal plate, and a second metal plate. The first ultrasonic transducer is disposed on the outer wall of one side of the slurry container; The first metal plate is disposed on the outer wall of the other side of the slurry container, and the position of the first metal plate corresponds to the position of the first ultrasonic transducer; The second ultrasonic transducer is positioned above the slurry container, at the same height as the liquid surface of the ceramic slurry, and perpendicular to the center of the bottom surface of the slurry container; The second metal plate is disposed on the bottom inner wall of the slurry container, and the shape of the second metal plate is adapted to fit the shape of the bottom inner wall.

2. The detection device for controlling the settling of ceramic slurry according to claim 1, characterized in that, The signal control module includes a feature wave algorithm module, a storage module, and a signal conditioning module that are interconnected. The feature wave algorithm module is used to divide the acquired ultrasonic echo signal into time points according to the ultrasonic wave quantity threshold, perform abnormal data deletion, amplitude accumulation and average value calculation on the ultrasonic echo signal within the time point, obtain the average value of the echo signal at each time point, and send the average value of the echo signal to the signal conditioning module. The signal conditioning module is used to amplify, filter, and perform analog-to-digital conversion on the received echo signal mean value to generate a signal mean value, and then send the signal mean value to the storage module. The storage module is used to store the ultrasonic echo signal and the signal mean.

3. The detection device for controlling the settling of ceramic slurry according to claim 1, characterized in that, The host computer includes a settlement height calculation module; The settling height calculation module is used to calculate the solid volume concentration of the ceramic slurry and the average rate of the ultrasonic echo signal acquired by the signal control module based on the signal mean, calculate the solid mass of the deposited layer of the ceramic slurry based on the solid volume concentration and the average rate, and calculate the settling height of the ceramic slurry based on the solid mass of the deposited layer.

4. The detection device for controlling the settling of ceramic slurry according to claim 3, characterized in that, The volume concentration of the solid is calculated using the following formula: In the formula, ρ s ρ is the density of the powder particles in the ceramic slurry. w C0 is the density of the aqueous solution in the ceramic slurry, C0 is the average signal value of the first ultrasonic transducer at a point in time, and C1 is the average signal value of the second ultrasonic transducer at a point in time. The average rate is calculated using the following formula: N=β(α s r m ) n exp(-a s r m ) In the formula, β is the calibration constant, and ρ m To ensure the density of a uniformly mixed ceramic slurry; The mass of solids in the deposited layer is calculated using the following formula: In the formula, α s0 α represents the solid volume concentration of the ceramic slurry obtained by the first ultrasonic transducer. s1 The solid volume concentration of the ceramic slurry obtained by the second ultrasonic transducer; The settlement height is calculated using the following formula: In the formula, s is the bottom area of ​​the slurry container.

5. The detection device for controlling the settling of ceramic slurry according to claim 1, characterized in that, The outside of the slurry container is equipped with a circulation pipe and a volumetric pump; The circulation pipe is vertically arranged on the outer wall of the slurry container, and both ends of the circulation pipe are respectively connected to the interior of the slurry container. The volumetric pump is arranged on the circulation pipe.

6. A method for detecting the settling of ceramic slurry, characterized in that, The method is applied to the detection apparatus as described in any one of claims 1 to 5, comprising: Based on the characteristic wave acquisition command, an ultrasonic start command is generated to enable the ultrasonic module to transmit ultrasonic signals to the slurry container and receive ultrasonic echo signals. Acquire the ultrasonic echo signal and calculate the signal mean of the ultrasonic echo signal; The settling height of the ceramic slurry in the slurry container is calculated based on the average value of the signal. A stirring command is generated based on the settling height to stir the ceramic slurry.

7. The detection method for controlling the settling of ceramic slurry according to claim 6, characterized in that, The step of calculating the signal mean of the ultrasonic echo signal includes: The collected ultrasonic echo signals are divided into time points according to the ultrasonic wave quantity threshold, and abnormal data is deleted, amplitude is accumulated and average value is calculated for the ultrasonic echo signals within the time points to obtain the average value of the echo signals at each time point. The mean value of the echo signal is amplified, filtered, and converted from analog to digital to generate the mean value of the signal.

8. The detection method for controlling the settling of ceramic slurry according to claim 6, characterized in that, The step of calculating the settling height of the ceramic slurry in the slurry container based on the average signal value includes: Based on the average signal value, the solid volume concentration of the ceramic slurry in the slurry container is calculated, and based on the solid volume concentration, the average rate of receiving the ultrasonic echo signal is calculated. The mass of the solid deposit layer of the ceramic slurry is calculated based on the solid volume concentration and the average rate, and the settling height of the ceramic slurry is calculated based on the mass of the solid deposit layer.

9. The detection method for controlling the settling of ceramic slurry according to claim 8, characterized in that, The volume concentration of the solid is calculated using the following formula: In the formula, ρ s ρ is the density of the powder particles in the ceramic slurry. w C0 is the density of the aqueous solution in the ceramic slurry, C0 is the average signal value of the first ultrasonic transducer at a point in time, and C1 is the average signal value of the second ultrasonic transducer at a point in time. The average rate is calculated using the following formula: N=β(α s r m ) n exp(-a s r m ) In the formula, β is the calibration constant, and ρ m To ensure the density of a uniformly mixed ceramic slurry; The mass of solids in the deposited layer is calculated using the following formula: In the formula, α s0 α represents the solid volume concentration of the ceramic slurry obtained by the first ultrasonic transducer. s1 The solid volume concentration of the ceramic slurry obtained by the second ultrasonic transducer; The settlement height is calculated using the following formula: In the formula, s is the bottom area of ​​the slurry container.

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