Particle weighing and dispensing apparatus and method based on light scattering method

Abstract

A particle weighing and dispensing apparatus and method based on a light scattering method. The apparatus comprises: a particle conveying device, comprising a sample injection channel (21) for particles to sequentially pass through and a pneumatic conveying system (22) for driving particles to sequentially pass through the sample injection channel (21), wherein the sample injection channel (21) is provided with a detection cavity (23), and the particles are particles having a determined shape, size and density; an optical detection device, comprising a light emitting assembly used for providing a focused light beam and a light receiving assembly used for receiving scattered light; and a weighing calculation device, being used for processing an electrical signal generated after the scattered light is received to obtain an electrical pulse signal, counting the number of pulses in the electrical pulse signal, and calculating the total mass of the dispensed sample on the basis of the counting result and the mass of a single particle. The weighing of the dispensed sample is converted into the weighing method of particle counting, achieving integration of the processes of sample weighing and sample dispensing into one process, reducing the sample loss in the sample dispensing process, and improving the efficiency and precision of weighing and dispensing of a solid sample.

Description

Particle weighing feeding equipment and method based on light scattering method TECHNICAL FIELD

[0001] The present application relates to the field of solid material weighing in chemical and biological fields, and particularly to a particle weighing feeding equipment and method based on light scattering method. BACKGROUND

[0002] Currently, there are mainly two ways for weighing and feeding solid samples in the process of chemical and pharmaceutical sample preparation, i.e., manual weighing and feeding and automatic weighing and feeding. The manual weighing and feeding is mainly performed by a tray balance to weigh the sample and manually feed the sample. The automatic weighing and feeding is performed by a high-precision fully-automatic solid weighing and sample feeding station. TECHNICAL PROBLEM

[0003] When the sample is prepared and tested by the manual weighing and feeding, the sample may be spilled or adhered to the transfer container during the sample transfer, which may cause waste of the sample and error in the final feeding. When a small amount of sample is weighed, the accuracy of the tray balance is limited, which may result in low efficiency and increase the sample preparation and screening period.

[0004] The automatic weighing and feeding needs to rely on a fully-automatic solid weighing and sample feeding station. This method relies on the accuracy of the sensor, and may have a large error in a large range. A precise automatic device is needed, which is large in size, complex in structure and high in cost. Therefore, how to provide a solid particle weighing method with high weighing accuracy is a technical problem to be solved at present. TECHNICAL SOLUTION

[0005] Therefore, the present application aims to overcome the defects of low weighing accuracy and low efficiency of the solid particles in the prior art, and to provide a particle weighing feeding equipment and method based on light scattering method.

[0006] To solve the above technical problems, the technical solution of the present application is as follows.

[0007] A particle weighing feeding equipment and method based on light scattering method, comprising:

[0008] A particle conveying device, comprising a sample inlet channel through which the particles pass in sequence and an air power system for driving the particles to pass through the sample inlet channel in sequence; a detection cavity is arranged on the sample inlet channel, and the detection cavity is a place where the measured particles are irradiated by a light beam; wherein the particles are particles with a certain shape, size and density;

[0009] An optical detection device, comprising a light emitting assembly for providing a concentrated light beam and a light receiving assembly for receiving scattered light of the measured particles excited by the light beam.

[0010] The weighing calculation device comprises a signal processing unit electrically connected with the light receiving assembly, and a weighing calculation unit electrically connected with the signal processing unit; the signal processing unit is used for processing an electric signal generated after the light receiving assembly receives scattered light to obtain an electric pulse signal, and the weighing calculation unit is used for counting the number of pulses of the electric pulse signal generated by the signal processing unit and calculating the total mass of the sample according to the counting result and the mass of a single measured particulate.

[0011] Further, the mass of a single particulate ranges from 1*10 -5 mg~5mg.

[0012] Further, the diameter of the sample inlet channel is R; when the particulate passes through the sample inlet channel, the distance between the two most distant points in the projection profile of a single particulate on the cross section of the sample inlet channel (21) is L, and 1.2L≤R≤2.8L is satisfied.

[0013] Further, the light emitting assembly comprises a light generator and a lens assembly, the light generator is used for emitting laser light, and the lens assembly is used for collimating and converging the laser light to form a linear light spot at the detection cavity.

[0014] Further, the optical detection device further comprises a light trap for eliminating laser light that does not emit.

[0015] Further, the weighing calculation unit is a microcontroller.

[0016] Further, the microcontroller is further electrically connected with a weighing setting unit, the weighing setting unit is used for inputting a preset weighing value; a control valve for controlling the opening and closing of the sample inlet channel is arranged on the sample inlet channel, and the control valve is electrically connected with the microcontroller; when the total mass of the sample calculated by the microcontroller reaches the preset weighing value, the microcontroller controls the control valve to be closed to stop the feeding of particulates.

[0017] A particulate weighing and feeding method based on light scattering method, comprising:

[0018] Particulates are transported to the sample inlet of the sample inlet channel, and the particulates pass through the detection cavity of the sample inlet channel one by one under the action of air power or their own gravity; wherein the particulates are particulates with a certain shape, size and density;

[0019] The detection cavity is irradiated with focused light, and a scattered light signal is received on the measured particulate irradiated by the detection cavity;

[0020] The received scattering light signal is processed to obtain an electric pulse signal, the number of pulses of the electric pulse signal is counted, and the total mass of the sample is calculated according to the counting result and the mass of a single measured particle.

[0021] Further, before the step of conveying the particles to the sample inlet of the sample channel, the method further comprises:

[0022] A plurality of particle sample groups are randomly selected from a batch of particles for weighing, each of the particle sample groups comprises a plurality of particles, and whether the mass of the batch of particles meets the requirement is determined according to the weighing result of the particle sample groups, the weight of a single particle and the number of particles in the particle sample groups.

[0023] If the determination result is yes, the next step is entered; if the determination result is no, another batch of particles is reselected.

[0024] Further, after the step of calculating the total mass of the sample according to the counting result and the mass of a single measured particle, the method further comprises:

[0025] Whether the total mass of the sample reaches a preset weighing value is determined.

[0026] If the determination result is no, the feeding of the particles is continued; if the determination result is yes, the feeding of the particles is stopped. Advantages

[0027] The technical scheme of the present application has the following advantages:

[0028] 1. The particle weighing and feeding equipment based on the light scattering method provided by the present application can sequentially pass particles with a determined shape, size and density through the detection cavity of the sample channel, the reflected light of the gathered light beam provided by the light emitting assembly after being reflected by the particles in the detection cavity is received by the light receiving assembly, the signal processing unit processes the electric signal generated after the light receiving assembly receives the scattered light to obtain an electric pulse signal, the weighing and calculation unit counts the number of pulses of the electric pulse signal, and the total mass of the sample can be calculated according to the counting result of the number of pulses and the mass of a single measured particle. Compared with the existing sample weighing method, the weighing of the sample is converted into the weighing method of particle counting, the processes of sample weighing and sample feeding are combined, the sample loss in the sample feeding process is reduced, the efficiency and precision of the solid sample weighing and feeding are improved, the weighing process is not limited to a high-precision mass sensor, the deficiency of the mass sensor in a large range of error is compensated by the counting and weighing method, and the method does not depend on precise automatic equipment, so the structure is simple, the volume is small and the cost is low.

[0029] 2. The particle weighing and feeding equipment based on the light scattering method provided by the present application, the mass range of a single particle is 1x10-5 Between mg and 5mg, due to the small mass of a single particle, the corresponding number of particles can be added according to the mass of the weighed sample to reduce the weighing error in a wide range.

[0030] 3. In the particle weighing and feeding equipment based on the light scattering method provided by the present invention, the diameter R of the sampling channel is 1.2 to 2.8 times the distance L between the two farthest points in the projected outline of a single particle on the cross-section of the feeding channel, which can ensure that the particles pass through the sampling channel one by one.

[0031] 4. The particulate matter weighing and feeding equipment based on the light scattering method provided by the present invention inputs a preset weighing value through a weighing setting unit. When the total mass of the feeding sample calculated by the microcontroller reaches the preset weighing value, the microcontroller controls the control valve to close to stop the feeding of the particulate matter, thereby realizing accurate feeding of the sample, and the feeding and weighing process can be automated, thereby improving the efficiency of sample feeding and weighing.

[0032] 5. The particle weighing and feeding method based on the light scattering method provided by the present invention converts the weighing of the feeding sample into a weighing method for counting the particles, thereby integrating the sample weighing and sample feeding processes into one, reducing sample loss in the sample feeding process, and improving the efficiency and accuracy of solid sample weighing and feeding; and the weighing process is not limited by high-precision mass sensors. Through counting and weighing, it makes up for the deficiency of large errors of mass sensors under a wide range of measuring ranges, and does not rely on sophisticated automated equipment. It has a simple structure, small size, and low cost.

[0033] 6. The particle weighing and feeding method based on the light scattering method provided by the present invention performs sampling weighing and testing on batches of particles before counting the particles, which can determine whether the quality of the batch of particles meets the requirements, reduce the error in the particle quality, and thus improve the accuracy of subsequent feeding and weighing results.

[0034] 7. The particle weighing and feeding method based on the light scattering method provided by the present invention can stop feeding the particle by setting a preset weighing value. When the total mass of the feeding sample reaches the preset weighing value, the particle feeding can be fully automated, thereby realizing the full automation of the particle feeding and weighing process and improving the sample feeding and weighing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Fig. 1 is a schematic diagram of a granulator for preparing granules with a determined shape, size and density according to an embodiment of the present application;

[0037] Fig. 2 is a schematic diagram of the structure of a granule weighing and feeding device based on light scattering according to an embodiment of the present application;

[0038] Fig. 3 is a schematic diagram of the structure of a solid granule passing through a detection cavity for light scattering detection on a sample platform according to an embodiment of the present application;

[0039] Fig. 4 is a calculation principle diagram of a weighing and calculation device for calculating the total mass of the feeding according to an embodiment of the present application;

[0040] Fig. 5 is a flowchart of a granule weighing and feeding method based on light scattering according to an embodiment of the present application.

[0041] Reference signs: 11, granulator; 21, sample channel; 22, air power system; 23, detection cavity; 311, light generator; 312, lens assembly; 32, light receiver; 33, light trap; 4, signal processing circuit; 5, microcontroller. Embodiments of the present application

[0042] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0043] A granule weighing and feeding device based on light scattering as shown in Figs. 1-4 comprises a granule conveying device, an optical detection device and a weighing and calculation device.

[0044] In some embodiments, the granule conveying device comprises a sample platform and a sample channel 21 and an air power system 22 arranged on the sample platform. The sample channel 21 is provided with a detection cavity 23, which is specifically a place where the measured granules are irradiated by a light beam. The feeding port of the sample channel 21 is funnel-shaped, the air power system 22 is located on one side of the feeding port of the sample channel 21, the sample platform is located on one side of the discharge port of the sample channel 21, and the detection cavity 23 is arranged on the sample channel 21 and close to one end of the discharge port. The diameter of the sample channel 21 is R; when the granules pass through the sample channel 21, the distance between the two most distant points in the projection profile of a single granule on the cross section of the sample channel 21 is L, and 1.2L≤R≤2.8L is satisfied. The air power system 22 drives the single granules to pass through the sample channel 21 one by one, and the granules are irradiated by light when passing through the detection cavity 23, thereby realizing a single granule counting process. The mass range of the single granule is 1×10 -5mg~5mg, since the mass of a single particle is small, the number of particles can be put in according to the mass of the sample, and the weighing error can be reduced in a wide range. In other embodiments, the particle delivery device can also not need to be provided with an air power system 22, and the particles can pass through the detection chamber 23 on the sample inlet channel 21 under the action of gravity, realizing the counting process of the particles. However, compared with the technical scheme that the particles pass through the sample inlet channel 21 under the action of gravity, the air power system 22 can increase the number of particles passing through the sample inlet channel 21 per unit time, thereby realizing high-throughput counting of particles and further improving the efficiency of subsequent sample feeding and weighing.

[0045] The optical detection device includes a light emitting assembly and a light receiving assembly. The light emitting assembly is used to provide a concentrated light beam, and the light receiving assembly is used to receive scattered light of the measured particles after the particles are excited by the light beam. The light emitting assembly includes a light generator 311 and a lens assembly 312. The light generator 311 is used to emit laser light, and the lens assembly 312 is used to collimate and collect the laser light to form a linear light spot at the detection chamber 23. In some embodiments, the lens assembly 312 includes a collimating lens, an X-axis direction cylindrical lens, and a Y-axis direction cylindrical lens arranged in sequence along the optical axis of the laser light. The light generator 311 can be a laser diode, and the positions of the X-axis direction cylindrical lens and the Y-axis direction cylindrical lens can be interchanged. The collimating lens, the X-axis direction cylindrical lens, and the Y-axis direction cylindrical lens collect and converge the laser light to form a linear light spot at the detection chamber 23. The X-axis direction is the direction of the optical axis, and the Y-axis direction is perpendicular to the optical axis. The X-axis direction cylindrical lens is used to shape the light in the X-axis direction, and the Y-axis direction cylindrical lens is used to shape the light in the Y-axis direction. The light receiving assembly is specifically a light receiver 32. The light receiving area of the light receiver 32 can be as large as possible. The direction in which the light receiver 32 receives the scattered light is perpendicular to the direction in which the light generator 311 emits the laser light.

[0046] The weighing and calculating device includes a signal processing unit electrically connected to the light receiver 32 and a weighing and calculating unit electrically connected to the signal processing unit. The signal processing unit is specifically a signal processing circuit 4 electrically connected to the light receiver 32. The signal processing circuit 4 is used to process the electrical signal generated after the light receiver 32 receives the scattered light to obtain an electrical pulse signal. The specific circuit structure of the signal processing circuit 4 is a conventional circuit, which is not described here. The weighing and calculating unit is specifically a microcontroller 5 electrically connected to the signal processing circuit 4. The microcontroller 5 is used to count the number of pulses of the electrical pulse signal generated by the signal processing circuit 4 and calculate the total mass of the sample according to the pulse count result and the mass of a single measured particle.

[0047] The particle weighing feeding device based on the light scattering method can manufacture the particles with the determined shape, size and density by using the granulator 11, and the mass of the single particle can be obtained; the reflected light of the gathered light beam provided by the light emitting assembly after being reflected by the particles in the detection cavity 23 is received by the light receiver 32, and the signal processing circuit 4 processes the electric signal generated after the light receiver 32 receives the scattered light to obtain the electric pulse signal; the microcontroller 5 counts the pulse number of the electric pulse signal, and the total mass of the feeding sample can be calculated according to the pulse counting result and the mass of the single measured particle; compared with the existing sample weighing method, the weighing of the feeding sample is converted into the weighing method of the particle counting, the process of the sample weighing and the sample feeding is combined, the sample loss in the sample feeding process is reduced, and the efficiency and the precision of the solid sample weighing feeding are improved; moreover, the weighing process is not limited to the high-precision mass sensor, the counting weighing method makes up for the large error of the mass sensor in a large range, and the precise automatic equipment is not relied on, so that the structure is simple, the volume is small, and the cost is low.

[0048] In some embodiments, the particle weighing feeding device based on the light scattering method further comprises a granulating device, specifically a granulator 11 for preparing particles with the determined shape, size and density. The shape of the particles can be any one of a spherical shape, a square shape or a cylindrical shape, as long as the shape of the particles is regular, so that the mass of the single particle can be calculated according to the volume and the density of the particle. The granulator 11 has mature granulating technology, and can manufacture the particles with the fixed shape and high size precision, which is beneficial to ensuring the mass precision of the single particle.

[0049] In some embodiments, the microcontroller 5 is further electrically connected to a weighing setting unit, and the weighing setting unit is used for inputting a preset weighing value. A control valve for controlling the opening and closing of the sample inlet channel 21 is arranged on the sample inlet channel 21, and the control valve and the air power system 22 are both electrically connected to the microcontroller 5. When the total mass of the feeding sample calculated by the microcontroller 5 reaches the preset weighing value, the microcontroller 5 controls the control valve to be closed and the air power system 22 to be stopped running to stop the feeding of the particles. The preset weighing value set by the weighing setting unit is inputted, and when the total mass of the feeding sample calculated by the microcontroller reaches the preset weighing value, the microcontroller 5 controls the control valve to be closed and the air power system 22 to be stopped running to stop the feeding of the particles, so that the accurate feeding of the sample can be realized, and the feeding and weighing process can be automatically performed to improve the efficiency of the sample feeding and weighing.

[0050] As shown in FIG. 5, the embodiment of the present application further provides a particle weighing feeding method based on the light scattering method, which is based on the particle weighing feeding device based on the light scattering method described above, and the method comprises the following steps:

[0051] Step S10, the particulate is transported to the sample inlet of the sample channel 21, and the particulate sequentially passes through the detection cavity 23 of the sample channel 21 under the action of air power or its own gravity; the particulate is a particulate with a certain shape, size and density;

[0052] The mass of a single particulate ranges from 1*10 -5 mg~5mg; the detection cavity 23 is specifically a place where the measured particulate is irradiated by a light beam. The diameter of the sample channel 21 is R, and when the particulate passes through the sample channel 21, the distance between the two most distant points in the projection profile of a single particulate on the cross section of the sample channel 21 is L, which satisfies 1.2L≤R≤2.8L. The air power system 22 drives the single particulate to sequentially pass through the sample channel 21, or the particulate sequentially passes through the sample channel 21 under the action of its own gravity, and the particulate is irradiated by light when passing through the detection cavity 23, realizing a single particulate counting process.

[0053] Step S20, the focused light irradiates the detection cavity 23, and the light scattered by the measured particulate in the detection cavity 23 is received.

[0054] The light generator 311 emits laser, the laser emitted by the light generator 311 is collimated and collected by the lens assembly 312, and then forms a linear light spot at the detection cavity 23. The light receiver 32 receives the light scattered by the measured particulate in the detection cavity 23.

[0055] Step S30, the received scattered light signal is processed to obtain an electric pulse signal, the number of pulses of the electric pulse signal is counted, and the total mass of the sample is calculated according to the counting result and the mass of a single measured particulate.

[0056] The signal processing circuit 4 is specifically used to process the electric signal generated by the light receiver after receiving the scattered light to obtain the electric pulse signal. The microcontroller 5 is specifically used to count the number of pulses of the electric pulse signal, and the microcontroller 5 calculates the total mass of the sample according to the counting result of the number of pulses and the mass of a single measured particulate.

[0057] This particulate weighing and feeding method based on light scattering method converts the weighing of the sample into the weighing mode of particulate counting, realizes the combination of sample weighing and sample feeding, reduces the sample loss in the sample feeding process, and improves the efficiency and precision of solid sample weighing and feeding. Moreover, the weighing process is not limited to high-precision mass sensors, and the counting and weighing mode compensates for the large error of mass sensors in a large range, and does not depend on precise automatic equipment, which is simple in structure, small in size and low in cost.

[0058] In some embodiments, before the step of feeding the particles into the sample inlet of the sample channel 21, the method further comprises: randomly selecting a plurality of particle sample groups from the batch of particles for weighing, each of the particle sample groups comprising a plurality of particles; determining whether the quality of the batch of particles meets the requirement according to the weighing results of the particle sample groups, the weight of a single particle, and the number of particles in the particle sample groups; if the determination result is yes, proceeding to the next step; if the determination result is no, selecting another batch of particles. For example, the batch of particles comprises tens of thousands of particles, each of which has a theoretical mass of 0.1 mg, 50 particles are selected as a particle sample group for weighing at a time, and the operation is repeated multiple times. If the weighing results are all within 5±0.05 mg, it is determined that the quality of the batch of particles meets the requirement. In this way, the mass error of the particles can be reduced, and the accuracy of the subsequent feeding and weighing results can be improved.

[0059] In some embodiments, after the step of calculating the total mass of the feeding sample according to the counting result and the mass of a single measured particle, the method further comprises: determining whether the total mass of the feeding sample reaches a preset weighing value; if the determination result is no, continuing to feed the particles; if the determination result is yes, stopping feeding the particles. By setting the preset weighing value, when the total mass of the feeding sample reaches the preset weighing value, the feeding of the particles can be stopped, so that the whole process of feeding and weighing the particles is automatically performed, and the efficiency of feeding and weighing the sample is improved.

[0060] In summary, the particle weighing and feeding device and method based on the light scattering method provided by the embodiments of the present application can convert the weighing of the feeding sample into the weighing of the particle counting, realize the combination of the processes of sample weighing and sample feeding, reduce the sample loss in the sample feeding process, improve the efficiency and accuracy of the weighing and feeding of the solid sample, and can realize the weighing and feeding of the sample with any mass. Moreover, the weighing process is not limited to a high-precision mass sensor, the counting and weighing method compensates for the large error of the mass sensor in a large range, and the device does not depend on a precise automatic device, and has a simple structure, a small size, and a low cost.

[0061] Obviously, the above embodiments are merely examples for clear illustration, and are not intended to limit the embodiments. Based on the above description, those skilled in the art can make other different forms of changes or modifications. Here, all the embodiments are not required to be exhausted, and the obvious changes or modifications derived therefrom are still within the protection scope of the present application.

Claims

1. A particle weighing and feeding device based on light scattering method, characterized in that: include: A particle conveying device comprises an injection channel (21) through which particles can pass sequentially, wherein the injection channel (21) is provided with a detection cavity (23), and the detection cavity (23) is a place where the particles to be measured are irradiated by a light beam; wherein the particles are particles with a certain shape, size, and density; An optical detection device, comprising a light emitting component for providing a focused light beam, and a light receiving component for receiving scattered light after the particles being detected are excited by the light beam; The weighing calculation device includes a signal processing unit electrically connected to the light receiving component and a weighing calculation unit electrically connected to the signal processing unit; the signal processing unit is used to process the electrical signal generated after the light receiving component receives scattered light to obtain an electrical pulse signal, and the weighing calculation unit is used to count the number of pulses of the electrical pulse signal generated by the signal processing unit, and calculate the total mass of the feed sample based on the counting result and the mass of a single measured particle.

2. The particle weighing and feeding equipment based on the light scattering method according to claim 1 is characterized in that: The mass range of a single particle is 1×10 -5 mg~5mg.

3. The particle weighing and feeding equipment based on the light scattering method according to claim 1, characterized in that: The diameter of the injection channel (21) is R; when the particles pass through the injection channel (21), the distance between the two farthest points in the projection profile of a single particle on the cross section of the injection channel (21) is L, satisfying 1.2L≤R≤2.8L.

4. The particle weighing and feeding equipment based on the light scattering method according to claim 1, characterized in that: The light emitting assembly comprises a light generator (311) and a lens assembly (312). The light generator (311) is used to emit laser light, and the lens assembly (312) is used to collimate and collect the laser light to form a linear light spot at the detection cavity (23).

5. The particle weighing and feeding equipment based on the light scattering method according to claim 1, characterized in that: The optical detection device further comprises a light trap (33) for eliminating laser light that has not been emitted.

6. The particle weighing and feeding equipment based on the light scattering method according to claim 1, characterized in that: The weighing calculation unit is a microcontroller (5).

7. The particle weighing and feeding equipment based on the light scattering method according to claim 6, characterized in that: The microcontroller (5) is also electrically connected to a weighing setting unit, and the weighing setting unit is used to input a preset weighing value; a control valve for controlling the on-off of the sampling channel (21) is provided on the sampling channel (21), and the control valve is electrically connected to the microcontroller (5); when the total mass of the feeding sample calculated by the microcontroller reaches the preset weighing value, the microcontroller controls the control valve to close to stop the feeding of the particulate matter.

8. A particle weighing and feeding method based on light scattering method, characterized in that: include: The particles are transported to the sampling port of the sampling channel (21), and the particles sequentially pass through the detection cavity (23) of the sampling channel (21) under the action of aerodynamic force or self-gravity; wherein the particles are particles with a certain shape, size, and density; The detection cavity (23) is illuminated by the focused light, and the light is received and irradiated on the particles to be detected through the detection cavity (23) to generate a scattered light signal; The received scattered light signal is processed to obtain an electric pulse signal, the number of pulses of the electric pulse signal is counted, and the total mass of the feed sample is calculated based on the counting result and the mass of a single measured particle.

9. The particle weighing and feeding method based on light scattering method according to claim 8, characterized in that: Before the step of transporting the particles to the injection port of the injection channel (21), the method further comprises: Randomly selecting a number of particulate matter sample groups from the batch of particulate matter for weighing, each of the particulate matter sample groups including a plurality of particulate matter; and determining whether the quality of the batch of particulate matter meets the requirements based on the weighing results of the particulate matter sample groups, the weight of each particle, and the number of particles in the particulate matter sample groups; If the judgment result is yes, proceed to the next step; if the judgment result is no, reselect another batch of particulate matter.

10. The particle weighing and feeding method based on light scattering method according to claim 8, characterized in that: After the step of calculating the total mass of the feed sample according to the counting results and the mass of the single measured particle, the method further includes: Determine whether the total mass of the sample reaches the preset weighing value; If the judgment result is no, the feeding of the particles continues; if the judgment result is yes, the feeding of the particles is stopped.

Images