Sample injector blanking control system and method based on laser particle analyzer and controller

Abstract

The invention relates to the technical field of laser measurement, in particular to a sample injector blanking control system and method based on a laser particle analyzer and a controller, and the sample injector blanking control system based on the laser particle analyzer comprises the laser particle analyzer which comprises a measurement window area; the dry sample injector comprises a hopper, an ultrasonic sensor, a vibration device and a control unit, the hopper is used for placing a to-be-measured sample, the ultrasonic sensor is used for measuring the volume of the to-be-measured sample falling from the hopper, and the control unit is used for generating a feedback signal according to the volume of the to-be-measured sample falling from the hopper; the vibration device is used for adjusting vibration speed according to the feedback signal; and the conveying pipeline is used for conveying the to-be-measured sample to a measurement window area of the laser particle analyzer through air. According to the invention, uniform blanking of the to-be-measured sample is ensured, and the accuracy of the particle size measurement result of the to-be-measured sample is improved.

Description

Technical Field

[0001] The present application relates to the field of laser measurement technology, and in particular to a feeder blanking control system, method and controller based on a laser particle size analyzer. Background Art

[0002] The measurement methods of laser particle size analyzer include wet test and dry test. The wet test uses liquid as the medium for testing. In the dry test, the sample injector is required to use gas as the medium to stably and evenly transport the sample to be tested to the measurement window area of ​​the laser particle size analyzer. Stable and even sample delivery is very important for laser particle size analyzer testing. If the speed at which the sample to be tested reaches the measurement window area is uneven, the light energy intensity of the laser scattering will also be uneven, which will affect the particle size of the sample to be tested calculated by inversion.

[0003] In the related art, most of the laser particle size analyzer testing methods control the vibration speed of the vibration device of the dry sampler to remain constant, and then determine that the forward movement speed of the sample to be tested is constant, so that the number of samples falling into the test window area should be basically quantitatively uniform. However, sometimes the amount of sample to be tested that falls is not necessarily proportional to the vibration intensity of the hopper. For example, the sample to be tested may not be spread continuously and evenly when placed in the hopper, so the vibration intensity may be uneven during the entire measurement period because the sample to be tested itself is not spread evenly, so the amount of samples falling into the test window area may also be uneven, sometimes more, sometimes less, and even interrupted in the middle; secondly, the sample to be tested may agglomerate in the actual movement of the hopper, and accumulate at the edge of the hopper, causing local poor operation, and finally causing uneven feeding of the sample to be tested, affecting the particle size of the sample to be tested calculated by inversion, and making the accuracy of the particle size measurement result of the sample to be tested low. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a feeder feeding control system, method and controller based on a laser particle size analyzer, which is conducive to ensuring uniform feeding of the sample to be tested and improving the accuracy of the particle size measurement results of the sample to be tested.

[0005] In a first aspect, the present application provides a sample feeder drop control system based on a laser particle size analyzer, comprising:

[0006] Laser particle size analyzer, including a measurement window area;

[0007] A dry sampler, comprising a hopper, an ultrasonic sensor, a vibration device and a control unit, wherein the hopper is used to place a sample to be tested, the ultrasonic sensor is used to determine and measure the volume of the sample to be tested dropped from the hopper, the control unit is used to generate a feedback signal according to the volume of the sample to be tested dropped from the hopper, and the vibration device is used to adjust the vibration speed according to the feedback signal;

[0008] The conveying pipeline is used to convey the sample to be measured to the measuring window area of ​​the laser particle size analyzer through air.

[0009] According to some embodiments of the present application, the ultrasonic sensor includes a transmitting end and a receiving end, the transmitting end is used to transmit an ultrasonic signal of a first frequency, and the receiving end is used to receive an ultrasonic signal of a second frequency.

[0010] According to some embodiments of the present application, the sampler blanking control system based on the laser particle size analyzer also includes: an air compressor and an oil-water filter, the input end of the oil-water filter is connected to the output end of the air compressor, the output end of the oil-water filter is connected to the input end of the dry sampler, the air compressor is used to provide air as a transmission medium for the sample to be tested, and the oil-water filter is used to dry the air blown out by the air compressor.

[0011] According to some embodiments of the present application, the feeder blanking control system based on the laser particle size analyzer further includes: an operational amplifier circuit, wherein the operational amplifier circuit is used to amplify the ultrasonic signal of the second frequency received by the receiving end.

[0012] According to some embodiments of the present application, the feeder blanking control system based on the laser particle size analyzer also includes: a waveform shaping circuit and a filter amplifier circuit, wherein the waveform shaping circuit is used to perform secondary amplification and filtering on the ultrasonic signal of the second frequency received by the receiving end, and the square wave output by the main control MCU is shaped to obtain a sine wave and then loaded into the transmitting end, and the transmitting end is controlled to output the ultrasonic signal of the first frequency; the filter amplifier circuit is used to perform secondary amplification and filtering on the ultrasonic signal of the second frequency received by the receiving end.

[0013] In a second aspect, an embodiment of the present application provides a method for controlling a material drop of an injector based on a laser particle size analyzer, which is applied to the material drop control system of an injector based on a laser particle size analyzer as described in the technical solution of the first aspect above, and the method comprises:

[0014] Obtaining the volume of the sample to be tested dropped from the hopper measured by the ultrasonic sensor;

[0015] Sending the volume of the sample to be tested to the control unit so that the control unit generates a feedback signal according to the volume of the sample to be tested;

[0016] The feedback signal is read, and the vibration speed of the vibration device is controlled according to the feedback signal.

[0017] According to some embodiments of the present application, the ultrasonic sensor includes a transmitting end and a receiving end, the transmitting end is used to transmit an ultrasonic signal of a first frequency, and the receiving end is used to receive an ultrasonic signal of a second frequency, and the method further includes:

[0018] Acquire an ultrasonic signal of the first frequency and an ultrasonic signal of the second frequency;

[0019] determining a voltage change of the ultrasonic sensor according to the ultrasonic signal of the first frequency and the ultrasonic signal of the second frequency;

[0020] Comparing the voltage variation with a preset ultrasonic standard value to determine an ultrasonic deviation value;

[0021] A feedback signal is generated according to the ultrasonic deviation value.

[0022] According to some embodiments of the present application, the sampler drop control system based on the laser particle size analyzer further includes an operational amplifier circuit, and the method further includes:

[0023] Acquiring an ultrasonic signal of the second frequency;

[0024] sending the ultrasonic signal of the second frequency to the operational amplifier circuit for amplification to obtain an amplified ultrasonic signal;

[0025] The amplified ultrasonic signal is sent to the control unit, so that the control unit sends an RS485 communication mathematical signal to the main control MCU according to the amplified ultrasonic signal.

[0026] In a third aspect, an embodiment of the present application provides a controller comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the method described in the technical solution of the second aspect when running the computer program.

[0027] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the method described in the technical solution of the second aspect above.

[0028] The feeder feeding control system, method and controller based on the laser particle size analyzer provided in the present application have at least one of the following advantages or beneficial effects: the laser particle size analyzer includes a measurement window area for particle size analysis, and the laser particle size analyzer measures the particle size distribution of particles of the sample to be tested by the principle of laser diffraction. The dry feeder includes a hopper, an ultrasonic sensor, a vibration device and a control unit, wherein the hopper is used to place the sample to be tested, and the ultrasonic sensor is used to measure the volume of the sample to be tested dropped from the hopper, and the feeding speed is determined according to the volume of the sample to be tested dropped, so as to ensure accurate feeding of the sample to be tested. The control unit generates a feedback signal according to the volume of the sample to be tested dropped from the hopper measured by the ultrasonic sensor, and the vibration device adjusts the vibration speed according to the feedback signals, driving the hopper to adjust the vibration. The speed at which the sample to be tested drops with the vibration of the hopper will be adjusted to control the flow speed of the sample to be tested, so as to achieve the purpose of uniform and stable feeding of the sample to be tested, thereby improving the accuracy of the particle size measurement results of the sample to be tested; the conveying pipeline conveys the sample to be tested to the measurement window area of ​​the laser particle size analyzer through air, ensuring that the sample to be tested can smoothly reach the measurement window area from the dry sampler for particle size analysis.

[0029] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a sample feeder blanking control system based on a laser particle size analyzer provided in an embodiment of the present application;

[0031] Figure 2 It is a structural schematic diagram of a dry method sample injector provided in an embodiment of the present application;

[0032] Figure 3 is a schematic diagram of the structure of an ultrasonic sensor provided in an embodiment of the present application;

[0033] Figure 4 It is a flow chart of a method for controlling a material drop of a sampler based on a laser particle size analyzer provided in an embodiment of the present application;

[0034] Figure 5 is a flow chart of a method for generating a feedback signal provided by an embodiment of the present application;

[0035] Figure 6 is a flow chart of a method for controlling a material drop of a sampler based on a laser particle size analyzer provided in another embodiment of the present application;

[0036] Figure 7It is a structural schematic diagram of a controller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] This section will describe in detail the specific embodiments of the present application. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present application, but it cannot be understood as a limitation on the scope of protection of the present application.

[0038] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, "above", "below", "within", etc. are understood to include the number itself, "any one" means one or more, "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. If there is a description of the first and the second, it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0039] It should be noted that the terms such as setting, installing, and connecting in the embodiments of the present application should be interpreted in a broad sense, and the technical personnel in the relevant technical field can reasonably determine the specific meanings of the above terms in the embodiments of the present application in combination with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or mutual communication; it can be directly connected or indirectly connected through an intermediate medium.

[0040] It should be noted that the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0041] The laser particle size analyzer requires a sample injector to transport the sample to be tested to the test window area, where the sample to be tested and the incident laser beam are tested to generate laser scattering and determine the scattering angle. Finally, the particle size distribution of the sample to be tested is calculated based on the algorithm.

[0042] The measurement methods of laser particle size analyzer include wet test and dry test. The wet test uses liquid as the medium for testing. In the dry test, the sample injector is required to use gas as the medium to stably and evenly transport the sample to be tested to the measurement window area of ​​the laser particle size analyzer. Stable and even sample delivery is very important for laser particle size analyzer testing. If the speed at which the sample to be tested reaches the measurement window area is uneven, the light energy intensity of the laser scattering will also be uneven, which will affect the particle size of the sample to be tested calculated by inversion.

[0043] In the related art, most of the laser particle size analyzer testing methods control the vibration speed of the vibration device of the dry sampler to remain constant, and then determine that the forward movement speed of the sample to be tested is constant, so that the number of samples falling into the test window area should be basically quantitatively uniform. However, sometimes the amount of sample to be tested that falls is not necessarily proportional to the vibration intensity of the hopper. For example, the sample to be tested may not be spread continuously and evenly when placed in the hopper, so the vibration intensity may be uneven during the entire measurement period because the sample to be tested itself is not spread evenly, so the amount of samples falling into the test window area may also be uneven, sometimes more, sometimes less, and even interrupted in the middle; secondly, the sample to be tested may agglomerate in the actual movement of the hopper, and accumulate at the edge of the hopper, causing local poor operation, and finally causing uneven feeding of the sample to be tested, affecting the particle size of the sample to be tested calculated by inversion, and making the accuracy of the particle size measurement result of the sample to be tested low.

[0044] Based on this, the embodiments of the present application provide a feeder feeding control system, method and controller based on a laser particle size analyzer, which is conducive to ensuring uniform feeding of samples to be tested and improving the accuracy of particle size measurement results of samples to be tested.

[0045] Reference Figure 1 and Figure 2 As shown, Figure 1 is a schematic diagram of a control system for a sampler dropper based on a laser particle size analyzer provided in an embodiment of the present application. Figure 2 It is a structural schematic diagram of a dry sampler provided in an embodiment of the present application; the sampler drop control system based on the laser particle size analyzer includes a laser particle size analyzer, a dry sampler and a conveying pipeline, the laser particle size analyzer includes a measuring window area, the dry sampler includes a hopper, an ultrasonic sensor, a vibration device and a control unit, the hopper is used to place the sample to be tested, the ultrasonic sensor is used to measure the volume of the sample to be tested dropped from the hopper, the control unit is used to generate a feedback signal according to the volume of the sample to be tested dropped from the hopper, and the vibration device is used to adjust the vibration speed according to the feedback signal; the conveying pipeline is used to transport the sample to be tested to the measuring window of the laser particle size analyzer through air.

[0046] The laser particle size analyzer is used to measure the particle size distribution of particles. The laser particle size analyzer includes a measurement window area, which is the position where the sample to be tested is measured. The laser particle size analyzer measures the particle size distribution of the particles of the sample to be tested by the principle of laser diffraction, and can provide a particle size range measurement of 0.1μm to 1000μm. The dry sampler includes a hopper, an ultrasonic sensor, a vibration device and a control unit, wherein the hopper is used to place the sample to be tested, and the ultrasonic sensor is used to measure the volume of the sample to be tested that falls from the hopper to ensure accurate sampling of the sample to be tested. The control unit generates a feedback signal according to the volume of the sample to be tested dropped from the hopper measured by the ultrasonic sensor, and the vibration device adjusts the vibration speed according to the feedback signals, driving the hopper to adjust the vibration. The speed at which the sample to be tested drops with the vibration of the hopper will be adjusted to control the flow speed of the sample to be tested, so as to achieve the purpose of uniform and stable feeding of the sample to be tested, thereby improving the accuracy of the particle size measurement results of the sample to be tested; the conveying pipeline conveys the sample to be tested to the measurement window area of ​​the laser particle size analyzer through air, ensuring that the sample to be tested can smoothly reach the measurement window area from the dry sampler for particle size analysis.

[0047] The sampler drop control system based on the laser particle size analyzer provided in the embodiment of the present application allows the volume of the sample to be tested that falls into the hopper to be measured, and the control unit generates a feedback signal based on the volume of the sample to be tested and feeds it back to the vibration device, and then adjusts the intensity of the vibration of the vibration device according to the speed of the sample to be tested. In this way, a closed feedback loop is formed to achieve the result of uniform feeding of the sample to be tested, and accurate particle size distribution data is obtained by accurately controlling the injection and dispersion of the sample to be tested, so as to realize automated particle size measurement. In this way, the particle size of the sample to be tested, such as the particle size of the powder material, can be monitored and controlled in real time, which is of great significance for optimizing the production process.

[0048] The feeder control system based on the laser particle size analyzer includes an ultrasonic sensor, which can measure the amount of the sample to be tested that is vibrated and discharged. If the sample to be tested drops more, the control unit generates a feedback signal according to the volume of the sample to be tested, and the change in the feedback signal is large. On the contrary, if the sample to be tested drops less, the control unit generates a feedback signal according to the volume of the sample to be tested, and the change in the feedback signal is small. The change value of the feedback signal feedback is sent to the control unit of the dry feeder, and the control unit adjusts the vibration speed of the vibration device according to the change value of the feedback signal. It can be understood that when the change value of the feedback signal is large, it indicates that the vibration speed of the current vibration device is too fast, which makes the sample to be tested discharge too fast, resulting in uneven discharge of the sample to be tested, and the vibration speed of the vibration device needs to be reduced, so as to achieve the purpose of uniform and stable discharge of the sample to be tested; when the change value of the feedback signal is too small, it indicates that the vibration speed of the current vibration device is too slow, so that the particle size of the sample to be tested cannot be normally identified, and the vibration speed of the vibration device needs to be increased to ensure that the particle size of the sample to be tested is normally identified, so as to obtain accurate particle size distribution data and realize automated particle size measurement.

[0049] It should be noted that the use of ultrasonic sensors to measure the speed of the sample feeding is different from the traditional method of measuring the speed of the sample feeding, such as infrared detection. The ultrasonic measurement method has the following advantages: First, the ultrasonic wave is not affected by the transparency of the sample to be measured, which is of great significance in the field of laser particle size analyzers, because there are many kinds of samples to be tested, such as graphite and glass beads, and their absorption rates are very different, and the light transmittance is completely different. For example, the same beam of infrared light passes through the same volume of graphite and glass beads, and the infrared light passed by graphite and glass beads is completely different, so there is no way to use infrared light to measure materials with different absorption rates. However, ultrasonic measurement does not have this problem. Ultrasonic waves are not affected by the transparency of the sample to be measured, which improves the accuracy of the particle size measurement results of the sample to be tested. Second, infrared light measurement, visible light measurement and other technologies are also easily affected by ambient light, so it is impossible to distinguish whether the change in light energy is caused by the passage of the sample to be tested or the interference of ambient light. In summary, the ultrasonic measurement technology for controlling the injection speed of the sample to be tested is very suitable for laser particle size analyzers, which need to measure a variety of substances. Ultrasonic measurement can improve the diversity of identifying the samples to be tested.

[0050] Reference Figure 3 As shown, Figure 3 It is a structural schematic diagram of an ultrasonic sensor provided in an embodiment of the present application. In some embodiments of the present application, the ultrasonic sensor includes a transmitting end and a receiving end, the transmitting end is used to transmit an ultrasonic signal of a first frequency, and the receiving end is used to receive an ultrasonic signal of a second frequency.

[0051] The ultrasonic sensor is in the shape of an I-beam, and is mainly composed of two ultrasonic heads at both ends of the I-beam. The two ultrasonic heads are a transmitting end and a receiving end respectively. The transmitting end is responsible for emitting an ultrasonic signal of an ultrasonic signal of a first frequency, and the receiving end is responsible for receiving an ultrasonic signal of a second frequency to sense the change value of the ultrasonic signal. When there is a sample to be tested falling and blocking between the transmitting end and the receiving end, the ultrasonic signal of the second frequency received by the receiving end will be reduced due to the obstruction. When there are many samples to be tested falling between the transmitting end and the receiving end, the ultrasonic signal of the second frequency received by the receiving end will be very small, so that the change value of the ultrasonic signal between the ultrasonic signal of the first frequency and the ultrasonic signal of the second frequency will become larger. The embodiment of the present application knows the volume size of the corresponding dropped sample to be tested according to the change value of the ultrasonic signal between the ultrasonic signal of the first frequency and the ultrasonic signal of the second frequency.

[0052] When the change value of the ultrasonic signal between the ultrasonic signal of the first frequency and the ultrasonic signal of the second frequency is greater than the first preset difference, it indicates that there are more samples to be tested between the current transmitting end and the receiving end, and the control unit generates a corresponding first feedback signal according to the change value of the ultrasonic signal between the ultrasonic signal of the first frequency and the ultrasonic signal of the second frequency, and the vibration device adjusts the vibration speed to be slower according to the first feedback signal; when the change value of the ultrasonic signal between the ultrasonic signal of the first frequency and the ultrasonic signal of the second frequency is less than the second preset difference, it indicates that there are fewer samples to be tested between the current transmitting end and the receiving end, the control unit generates a corresponding second feedback signal according to the change value of the ultrasonic signal between the ultrasonic signal of the first frequency and the ultrasonic signal of the second frequency, and the vibration device adjusts the vibration speed to be faster according to the second feedback signal. When the change value of the ultrasonic signal between the ultrasonic signal of the first frequency and the ultrasonic signal of the second frequency is the third preset difference, it indicates that the samples to be tested between the current transmitting end and the receiving end are falling at a uniform speed, the control unit generates a third feedback signal, and the vibration device keeps the vibration speed unchanged according to the third feedback signal. The vibration device adjusts the vibration speed according to these feedback signals, driving the hopper to adjust the vibration. The speed at which the sample to be tested falls with the vibration of the hopper will be adjusted, controlling the flow rate of the sample to be tested, achieving the purpose of uniform and stable feeding of the sample to be tested, thereby improving the accuracy of the particle size measurement results of the sample to be tested.

[0053] In some embodiments of the present application, the ultrasonic signal of the first frequency is an ultrasonic signal of 200KHz. Those skilled in the art may set the size of the ultrasonic signal of the first frequency according to actual conditions. The embodiments of the present application do not limit the size of the ultrasonic signal of the first frequency.

[0054] In some embodiments of the present application, an air compressor and an oil-water filter, the input end of the oil-water filter is connected to the output end of the air compressor, the output end of the oil-water filter is connected to the input end of the dry sampler, the air compressor is used to provide air as a transmission medium for the sample to be tested, and the oil-water filter is used to dry the air blown out by the air compressor.

[0055] An air compressor is a device that provides compressed air. It compresses air in the atmosphere into high-pressure airflow for subsequent sample transmission. As a transmission medium for the sample to be tested, the output end of the air compressor is connected to the input end of the oil-water filter. The air blown out by the air compressor is dried and filtered through the oil-water filter to remove oil and moisture in the air, avoid air mixing with the lubricating oil and condensed water inside the air compressor, and prevent impurities in the air from affecting the performance of the sample to be tested.

[0056] The compressed air generated by the air compressor is first purified by the oil-water filter. After removing the oil and water, the clean compressed air is sent to the dry sampler. In the dry sampler, the compressed air is used to blow the sample to be tested out of the hopper and send it to the measurement window area of ​​the laser particle size analyzer through the delivery pipeline. Using this configuration, the environmental conditions during the transmission of the sample to be tested can be effectively controlled to ensure that the sample to be tested is not affected by water and oil during the transmission process, thereby improving the accuracy and reliability of the measurement results.

[0057] In some embodiments of the present application, the feeder blanking control system based on the laser particle size analyzer further includes an operational amplifier circuit, and the operational amplifier circuit is used to amplify the ultrasonic signal of the second frequency received by the receiving end.

[0058] In the feeder drop control system based on the laser particle size analyzer, the application of the operational amplifier circuit is mainly used to amplify the second ultrasonic signal at the receiving end. The ultrasonic sensor is used to measure the volume of the sample to be tested that falls from the hopper. During this process, a change value of the ultrasonic signal related to the volume of the sample to be tested will be generated between the transmitting end and the receiving end of the ultrasonic sensor. The operational amplifier circuit is used to amplify the weak second frequency ultrasonic signal received by the receiving end of the ultrasonic sensor. The operational amplifier circuit can be configured into various circuits, such as an inverting proportional amplifier circuit, a differential amplifier circuit, etc., to achieve the amplification and filtering functions of the second frequency ultrasonic signal. The operational amplifier circuit amplifies the ultrasonic signal received by the receiving end through its high gain characteristics, making it easier to perform subsequent processing and analysis. The volume of the sample to be tested is determined based on the amplified ultrasonic signal and the ultrasonic signal emitted by the transmitting end, and then a feedback signal is generated. The control unit generates feedback signals based on the amplified ultrasonic signals. These feedback signals will be used to adjust the speed of the vibration device to control the flow and falling process of the sample to be tested, thereby achieving accurate transmission and measurement of the sample to be tested. The amplified and processed ultrasonic signals ensure that the sample to be tested is accurately transported to the measurement window of the laser particle size analyzer through the delivery pipeline for particle size analysis.

[0059] In one embodiment, an operational amplifier circuit is used to amplify the weak second-frequency ultrasonic signal received by the receiving end of the ultrasonic sensor and convert it into a signal that can be read by the control unit. The control unit then sends an RS485 communication mathematical signal to the main control MCU based on the read signal. The main control MCU then controls the vibration unit based on the ultrasonic feedback signal to drive the hopper to adjust the vibration. The speed at which the sample to be tested falls forward with the vibration of the hopper will be adjusted.

[0060] The operational amplifier circuit plays a key role in signal amplification and preprocessing in the feeder drop control system based on the laser particle size analyzer, enabling the laser particle size analyzer to accurately measure the particle size distribution of the sample to be measured. The accuracy and reliability of the particle size distribution measurement of the sample are improved by setting the operational amplifier circuit in the feeder drop control system based on the laser particle size analyzer.

[0061] In some embodiments of the present application, the sample feeder blanking control system based on the laser particle size analyzer also includes a waveform shaping circuit and a filter amplifier circuit. The waveform shaping circuit is used to shape the square wave output by the main control MCU to obtain a sine wave and then load it to the transmitting end, and control the transmitting end to output an ultrasonic signal of the first frequency; the filter amplifier circuit is used to perform secondary amplification and filtering on the ultrasonic signal of the second frequency received by the receiving end.

[0062] The main function of the waveform shaping circuit is to shape the square wave signal output by the main control MCU to generate a sine wave signal suitable for the transmitting end of the ultrasonic sensor. The waveform shaping circuit can convert the digital signal into an analog signal, so that the transmitting end can output an ultrasonic signal of the first frequency, which is essential for accurately controlling the blanking process of the sample; the filter amplifier circuit is used to process the ultrasonic signal of the second frequency received by the transmitting and receiving end of the ultrasonic sensor. The filter amplifier circuit first performs secondary amplification processing on the ultrasonic signal of the second frequency to enhance the strength of the signal and make it easier to be processed by the subsequent data processing unit. At the same time, the filter amplifier circuit is also responsible for filtering out possible noise and interference to ensure the purity of the signal, thereby improving the measurement accuracy and reliability of the sampler blanking control system based on the laser particle size analyzer.

[0063] A waveform shaping circuit and a filter amplifier circuit are set in the sampler blanking control system based on the laser particle size analyzer. The waveform shaping circuit ensures that the transmitting end of the ultrasonic sensor can accurately transmit ultrasonic signals, while the filter amplifier circuit ensures that the receiving end of the ultrasonic sensor can accurately receive and process these signals. In this way, the sampler blanking control system based on the laser particle size analyzer can achieve accurate control of the blanking process of the sample to be measured, thereby improving the measurement accuracy and efficiency of the laser particle size analyzer.

[0064] Reference Figure 4 As shown, Figure 4 : is a flow chart of a method for controlling a material drop of a sampler based on a laser particle size analyzer provided in an embodiment of the present application. The method for controlling a material drop of a sampler based on a laser particle size analyzer includes but is not limited to steps S100 to S300. Specifically,

[0065] Step S100: obtaining the volume of the sample to be tested dropped from the hopper measured by the ultrasonic sensor;

[0066] Step S200: sending the volume of the sample to be tested to the control unit, so that the control unit generates a feedback signal according to the volume of the sample to be tested;

[0067] Step S300: reading the feedback signal, and controlling the vibration speed of the vibration device according to the feedback signal.

[0068] The sampler drop control method based on the laser particle size analyzer is applied to the sampler drop control system based on the laser particle size analyzer. The sampler drop control system based on the laser particle size analyzer includes: a laser particle size analyzer, including a measurement window area; a dry sampler, including a hopper, an ultrasonic sensor, a vibration device and a control unit, the hopper is used to place the sample to be tested, the ultrasonic sensor is used to measure the volume of the sample to be tested dropped from the hopper, the control unit is used to generate a feedback signal according to the volume of the sample to be tested dropped from the hopper, and the vibration device is used to adjust the vibration speed according to the feedback signal; a conveying pipeline is used to convey the sample to be tested to the measurement window area of ​​the laser particle size analyzer through air.

[0069] The feeder drop control method based on the laser particle size analyzer includes: obtaining the volume of the sample to be tested dropped from the hopper measured by the ultrasonic sensor, and sending the volume of the sample to be tested to the control unit, so that the control unit generates a feedback signal according to the volume of the sample to be tested dropped from the hopper, and reading the feedback signal. The feedback signal indicates whether the vibration speed of the vibration device needs to be adjusted. This feedback signal will be used to guide subsequent control actions to ensure the drop rate of the sample to be tested, and the vibration speed of the vibration device is controlled according to the feedback signal, so that the vibration device adjusts the vibration speed according to these feedback signals, drives the hopper to adjust the vibration, and the speed at which the sample to be tested falls with the vibration of the hopper will be adjusted, and the flow speed of the sample to be tested is controlled to achieve the purpose of uniform and stable discharge of the sample to be tested, thereby improving the accuracy of the particle size measurement result of the sample to be tested.

[0070] Reference Figure 5 As shown, Figure 5 is a flowchart of a method for generating a feedback signal provided in an embodiment of the present application. The method for generating a feedback signal includes but is not limited to steps S210 to S240. Specifically,

[0071] Step S210: Acquire an ultrasonic signal of a first frequency and an ultrasonic signal of a second frequency;

[0072] Step S220: determining a voltage change of the ultrasonic sensor according to the ultrasonic signal of the first frequency and the ultrasonic signal of the second frequency;

[0073] Step S230: comparing the voltage variation with a preset ultrasonic standard value to determine an ultrasonic deviation value;

[0074] Step S240: generating a feedback signal according to the ultrasonic deviation value.

[0075] In some embodiments of the present application, the ultrasonic sensor includes a transmitting end and a receiving end, the transmitting end is used to transmit an ultrasonic signal of a first frequency, and the receiving end is used to receive an ultrasonic signal of a second frequency. The method also includes: acquiring an ultrasonic signal of the first frequency and an ultrasonic signal of the second frequency, and determining a change value of the ultrasonic signal between the ultrasonic signal of the first frequency and the ultrasonic signal of the second frequency, and then determining a voltage change of the corresponding ultrasonic sensor according to the change value of the ultrasonic signal of the first frequency and the ultrasonic signal of the second frequency, and comparing the voltage change of the ultrasonic sensor with an ultrasonic standard value to determine an ultrasonic deviation value. It can be understood that when the ultrasonic signal of the first frequency and the ultrasonic signal of the second frequency are The greater the change value of the ultrasonic signal between the ultrasonic signal of the second frequency, the greater the voltage change, and the larger the corresponding ultrasonic deviation value. At this time, the total volume of the samples to be tested dropped between the transmitting end and the receiving end is larger, and a feedback signal is generated according to the ultrasonic deviation value, and the feedback signal is used to indicate that the vibration speed of the vibration adjustment device is reduced; conversely, the smaller the change value of the ultrasonic signal between the ultrasonic signal of the first frequency and the ultrasonic signal of the second frequency, the smaller the voltage change, and the smaller the corresponding ultrasonic deviation value. At this time, the total volume of the samples to be tested dropped between the transmitting end and the receiving end is smaller, and a feedback signal is generated according to the ultrasonic deviation value, and the feedback signal is used to indicate that the vibration speed of the vibration adjustment device is increased.

[0076] The voltage change of the ultrasonic sensor is determined by the ultrasonic signal of the first frequency and the ultrasonic signal of the second frequency, and the ultrasonic deviation value is determined by the voltage change. The feedback signal is determined according to the size of the ultrasonic deviation value. The vibration device adjusts the vibration speed according to the feedback signal to drive the hopper to adjust the vibration. The speed at which the sample to be tested falls with the vibration of the hopper will be adjusted to control the flow speed of the sample to be tested, so as to achieve the purpose of uniform and stable feeding of the sample to be tested, thereby improving the accuracy of the particle size measurement result of the sample to be tested.

[0077] Reference Figure 6 As shown, Figure 6 is a flowchart of a method for controlling a material drop of a sampler based on a laser particle size analyzer provided by another embodiment of the present application. The flowchart of the method for controlling a material drop of a sampler based on a laser particle size analyzer includes but is not limited to steps S400 to S420. Specifically,

[0078] Step S400: Acquire an ultrasonic signal of a second frequency;

[0079] Step S410: sending the ultrasonic signal of the second frequency to the operational amplifier circuit for amplification processing to obtain an amplified ultrasonic signal;

[0080] Step S420: Send the amplified ultrasonic signal to the control unit, so that the control unit sends an RS485 communication mathematical signal to the main control MCU according to the amplified ultrasonic signal.

[0081] In some embodiments of the present application, the feeder blanking control system based on the laser particle size analyzer further includes an operational amplifier circuit, which is used to amplify and process the ultrasonic signal of the second frequency received by the receiving end, obtain the ultrasonic signal of the second frequency received by the receiving end, send the ultrasonic signal of the second frequency to the operational amplifier circuit, the operational amplifier circuit amplifies and processes the weak ultrasonic signal of the second frequency received by the receiving end of the ultrasonic sensor, obtains the amplified ultrasonic signal, determines the volume of the sample to be tested according to the amplified ultrasonic signal and the ultrasonic signal emitted by the transmitting end, and then generates a feedback signal. The amplified ultrasonic signal is sent to the control unit, and the control unit generates a feedback signal according to the amplified ultrasonic signal, so that the control unit sends an RS485 communication mathematical signal and a feedback signal to the main control MCU according to the amplified ultrasonic signal, and the main control MCU reads the feedback signal, and the feedback signal is used to adjust the speed of the vibration device, and the vibration speed of the vibration device is controlled according to the feedback signal to control the flow and blanking process of the sample to be tested, thereby realizing accurate transmission and measurement of the sample to be tested, and the amplified and processed ultrasonic signal ensures that the sample to be tested is accurately transported to the measurement window of the laser particle size analyzer through the conveying pipeline for particle size analysis.

[0082] Reference Figure 7 As shown, Figure 7It is a structural diagram of a controller 1000 provided in an embodiment of the present application, including a processor 1001, which can be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the method provided in the embodiment of the present application; a memory 1002, which can be implemented in the form of a read-only memory 1002 (Read Only Memory, ROM), a static storage device, a dynamic storage device or a random access memory 1002 (Random Access Memory, RAM), etc. The memory 1002 can store an operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented by software or firmware, the relevant program codes are stored in the memory 1002 and are called by the processor 1001 to execute the embodiments of this application; the input / output interface 1003 is used to implement information input and output; the communication interface 1004 is used to implement communication interaction between this device and other devices, and communication can be achieved through wired methods (such as USB, network cables, etc.) or wireless methods (such as mobile networks, WIFI, Bluetooth, etc.); a bus transmits information between various components of the device (such as the processor 1001, the memory 1002, the input / output interface 1003 and the communication interface 1004); wherein the processor 1001, the memory 1002, the input / output interface 1003 and the communication interface 1004 are connected to each other within the device through the bus.

[0083] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer-readable storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer-readable storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer-readable storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0084] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the description, claims and drawings.

Claims

1. A sample feeder blanking control system based on a laser particle size analyzer, characterized in that: include: Laser particle size analyzer, including a measurement window area; A dry sampler, comprising a hopper, an ultrasonic sensor, a vibration device and a control unit, wherein the hopper is used to place a sample to be tested, the ultrasonic sensor is used to determine and measure the volume of the sample to be tested dropped from the hopper, the control unit is used to generate a feedback signal according to the volume of the sample to be tested dropped from the hopper, and the vibration device is used to adjust the vibration speed according to the feedback signal; The delivery pipeline is used to deliver the sample to be tested to the measuring window area of ​​the laser particle size analyzer through air.

2. The feeder blanking control system based on the laser particle size analyzer according to claim 1, characterized in that: The ultrasonic sensor comprises a transmitting end and a receiving end, wherein the transmitting end is used to transmit an ultrasonic signal of a first frequency, and the receiving end is used to receive an ultrasonic signal of a second frequency.

3. The feeder blanking control system based on the laser particle size analyzer according to claim 1, characterized in that: Also includes: An air compressor and an oil-water filter, wherein the input end of the oil-water filter is connected to the output end of the air compressor, the output end of the oil-water filter is connected to the input end of the dry sampler, the air compressor is used to provide air as a transmission medium for the sample to be tested, and the oil-water filter is used to dry the air blown out by the air compressor.

4. The feeder blanking control system based on the laser particle size analyzer according to claim 2, characterized in that: It also includes an operational amplifier circuit, which is used to amplify the ultrasonic signal of the second frequency received by the receiving end.

5. The feeder blanking control system based on the laser particle size analyzer according to claim 2, characterized in that: It also includes a waveform shaping circuit and a filtering and amplifying circuit. The waveform shaping circuit is used to shape the square wave output by the main control MCU to obtain a sine wave and then load it to the transmitting end, and control the transmitting end to output the ultrasonic signal of the first frequency; the filtering and amplifying circuit is used to perform secondary amplification and filtering on the ultrasonic signal of the second frequency received by the receiving end.

6. A method for controlling the blanking of a sampler based on a laser particle size analyzer, applied to the control system for the blanking of a sampler based on a laser particle size analyzer as claimed in any one of claims 1 to 5, characterized in that: The method comprises: Obtaining the volume of the sample to be tested dropped from the hopper measured by the ultrasonic sensor; Sending the volume of the sample to be tested to the control unit so that the control unit generates a feedback signal according to the volume of the sample to be tested; The feedback signal is read, and the vibration speed of the vibration device is controlled according to the feedback signal.

7. The method for controlling the material dropping of a sampler based on a laser particle size analyzer according to claim 6, characterized in that: The ultrasonic sensor comprises a transmitting end and a receiving end, wherein the transmitting end is used to transmit an ultrasonic signal of a first frequency, and the receiving end is used to receive an ultrasonic signal of a second frequency. The method further comprises: Acquire an ultrasonic signal of the first frequency and an ultrasonic signal of the second frequency; determining a voltage change of the ultrasonic sensor according to the ultrasonic signal of the first frequency and the ultrasonic signal of the second frequency; Comparing the voltage variation with a preset ultrasonic standard value to determine an ultrasonic deviation value; A feedback signal is generated according to the ultrasonic deviation value.

8. The method for controlling the material dropping of a sampler based on a laser particle size analyzer according to claim 7, characterized in that: The feeder drop material control system based on the laser particle size analyzer further includes an operational amplifier circuit, and the method further includes: Acquiring an ultrasonic signal of the second frequency; sending the ultrasonic signal of the second frequency to the operational amplifier circuit for amplification to obtain an amplified ultrasonic signal; The amplified ultrasonic signal is sent to the control unit, so that the control unit sends an RS485 communication mathematical signal to the main control MCU according to the amplified ultrasonic signal.

9. A controller, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the method according to any one of claims 6 to 8 when executing the computer program.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the method according to any one of claims 6 to 8.

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