Method for automatic cleaning of a grain sample pulverizing bin and piping

Abstract

This invention relates to the field of grain analysis and sample pretreatment technology, and discloses a method for automated cleaning of grain sample pulverizing chambers and pipelines. It is based on a pretreatment and self-cleaning system comprising a pulverizing chamber, an air knife storage chamber, and a non-contact rotary air knife. The method includes: in the feeding and pulverizing stage, the sample is pulverized within the pulverizing chamber; in the primary cleaning stage, the non-contact rotary air knife sprays high-pressure pulsed gas combined with negative pressure suction to remove adhering residues; in the homogeneous fluidized bed cleaning stage, a homogeneous powder mixture is introduced, which is rolled up by the high-pressure pulsed gas to form a gas-solid two-phase fluid, physically scraping the residues within the chamber. This invention effectively avoids cross-contamination and improves the thoroughness of removing and emptying stubborn residues.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grain analysis and sample pretreatment, in particular to a method for automatic cleaning of a grain sample crushing bin and pipeline. BACKGROUND

[0002] In the process of grain safety analysis (such as pesticide residue, heavy metal, and mycotoxin detection), the raw grain sample must be crushed and subjected to other pretreatment operations. With the popularization of automation technology, fully automatic grain pretreatment systems are widely used. However, due to the variety of different batches of grain samples, and the fact that some samples contain high moisture and high oil content, stubborn attachments and residues are easily formed inside the crushing cabin and the discharge pipeline after crushing. In order to avoid cross contamination between different batches of samples, the equipment must be thoroughly cleaned between two sample preparation processes.

[0003] The common cleaning method in the industry currently relies on the next material to be tested for rinsing, that is, directly consuming part of the new batch of raw grain samples for crushing, in an attempt to use the new material to wash away the residues of the previous batch. This traditional method not only wastes valuable test sample resources, but also, when faced with stubborn attachments with high moisture and high oil content, simple material rinsing cannot achieve complete elution, and the cross contamination between different batches is still very high. Some pretreatment equipment has begun to introduce automatic pneumatic cleaning technology, but in actual operation, the following technical defects still exist: The existing equipment usually integrates or exposes the pneumatic cleaning device directly inside or above the crushing cabin. During the feeding of the raw grain sample and the high-speed crushing and grinding process, the material will splash violently. The cleaning components exposed to the processing environment are easily attached by the sample to be tested, which not only causes the current sample to be contaminated by the substances previously attached to the cleaning components, but also the hard grain particles that splash can cause physical impact and structural damage to the precision cleaning nozzle.

[0004] In the few devices that attempt pneumatic cleaning, a single high-pressure gas is usually relied on to blow off the inside of the crushing cabin. Since the physical density of pure gas is low, the dynamic impact force generated by the gas on the cabin wall and blade surface is limited, making it difficult to effectively overcome the structural adhesion of high-moisture and high-fat attachment residues, resulting in incomplete cleaning. If solid medium assisted friction cleaning is attempted in the cabin, the continuous filling of high-pressure gas will cause the pressure inside the sealed crushing cabin to rise sharply, which can easily cause the high-pressure gas flow with dust to overflow and backflow to the mechanical transmission area above or outside the cabin, causing the equipment to jam or malfunction.

[0005] After the main body of the crushing chamber is cleaned, the detached residue needs to be discharged through the bottom valve and waste discharge pipeline. Existing venting designs mostly rely on the material falling freely under its own weight or simple positive pressure blowing. This method lacks strong directional venting constraints when dealing with dead corners inside the valve structure and long lower pipelines. The detached residue is prone to secondary deposition and retention as it flows through the valve body and pipeline inner walls, making it impossible to thoroughly wash away the material from the discharge channel. Long-term accumulation seriously affects the accuracy of subsequent inspection data. Summary of the Invention

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a system for automated cleaning of grain sample crushing chamber and pipelines, including a central control system, a feed inlet, a crushing chamber, an air knife storage chamber, and a high-power industrial negative pressure fan at the bottom; The crushing chamber has a top, an interior, an exterior, a bottom, and an inner wall. The top of the crushing chamber has an inner top wall. A drive shaft and blades are installed inside the crushing chamber. A crushing drive motor is installed outside the crushing chamber, and the drive motor is connected to the drive shaft and blades. A bottom discharge channel is provided at the bottom of the crushing chamber, and a bottom valve is installed at the bottom discharge channel. The bottom valve has an inner surface, and a lower pipe is connected below the bottom valve. The lower pipe has an inner wall, and its end is connected to a waste bin. The feed inlet is located at the top of the crushing chamber and is equipped with a feed valve; the feed inlet is directly connected to the interior of the crushing chamber. The air knife storage chamber has an interior; the air knife storage chamber is vertically installed on one side of the top of the pulverizing chamber; the air knife storage chamber is equipped with a lifting cylinder, a non-contact rotary air knife, and a self-rotation drive assembly; the self-rotation drive assembly is connected to the non-contact rotary air knife; the non-contact rotary air knife has an air knife spindle, a bottom end, and a side wall; the bottom end and the side wall of the non-contact rotary air knife are arrayed with inclined micro nozzles; the lifting cylinder is used to drive the non-contact rotary air knife to move vertically up and down, so that the non-contact rotary air knife can pass through the top wall of the pulverizing chamber and enter the interior of the pulverizing chamber; the non-contact rotary air knife is connected to an external high-pressure air source through a connecting air passage, and an air intake control valve is installed in the connecting air passage; The high-power industrial negative pressure fan at the bottom is installed on the lower pipeline, and the high-power industrial negative pressure fan at the bottom is connected to the bottom valve of the pulverizing chamber through the lower pipeline; The central control system is electrically connected to the feed valve, the crushing drive motor, the crushing chamber bottom valve, the lifting cylinder, the self-rotation drive assembly, the air intake control valve, the pulse solenoid valve, and the bottom high-power industrial negative pressure fan.

[0007] Preferably, the method for automated cleaning of the grain sample crushing chamber and pipelines is based on the above-mentioned system implementation. The method includes a feeding crushing stage, a primary cleaning stage, a homogeneous fluidized bed cleaning stage, a negative pressure evacuation stage, and a system reset stage. The feeding and crushing stage includes: the central control system controls the raw grain sample to be tested to fall into the crushing chamber, the crushing drive motor drives the drive shaft and blades to rotate to crush the raw grain sample to be tested to generate the initial crushed material, and the attached residue is formed inside the crushing chamber, and then the initial crushed material is discharged. The initial cleaning stage includes: the central control system controlling the non-contact rotary air knife to enter the pulverizing chamber; the air intake control valve opening to allow the external high-pressure air source to supply high-pressure pulsed gas to the non-contact rotary air knife; the self-rotation drive assembly driving the non-contact rotary air knife to rotate; and the inclined micro-nozzle spraying the high-pressure pulsed gas to peel off the attached residue; and the bottom high-power industrial negative pressure fan operating to discharge the attached residue. The homogeneous fluidized bed cleaning stage includes: the central control system controlling the homogeneous cleaning sample to fall into the pulverizing chamber; the pulverizing drive motor driving the drive shaft and blades to rotate and pulverize the homogeneous cleaning sample to generate a homogeneous powder mixture; the central control system controlling the non-contact rotary air knife to spray the high-pressure pulsed gas; the high-pressure pulsed gas and the homogeneous powder mixture to form a gas-solid two-phase fluid to physically scrape the attached residue inside the pulverizing chamber; The negative pressure venting stage includes: the central control system controlling the operation of the high-power industrial negative pressure fan at the bottom, and the homogeneous powder mixture with the attached residue passing through the bottom valve of the crushing chamber and the lower pipeline into the waste bin; The system reset phase includes: the central control system controlling the non-contact rotary air knife to retract into the air knife storage chamber, and the system completing the state reset.

[0008] Preferably, in the feeding and crushing stage: The central control system controls the opening of the feed valve; the raw grain sample to be tested falls into the crushing chamber through the feed inlet; After the raw grain sample to be tested is fed, the central control system controls the feeding valve to close; the central control system controls the bottom valve of the grinding chamber to remain closed, and controls the grinding drive motor to run, driving the drive shaft and blades to rotate inside the grinding chamber to mechanically grind the raw grain sample to be tested; after grinding, the initial pulverized material and the high moisture and high oil components of the raw grain sample to be tested adhere to the inner wall of the grinding chamber, the drive shaft and the blade surface, forming the attached residue; then the central control system controls the bottom valve of the grinding chamber to open, and discharges the initial pulverized material.

[0009] Preferably, in the primary cleaning stage: After the attached residue is formed, the central control system controls the bottom valve of the pulverizing chamber to remain open; the central control system controls the lifting cylinder to drive the non-contact rotary air knife to move downwards into the pulverizing chamber. The central control system controls the air intake control valve to open and close alternately at a preset frequency, so that the external high-pressure air source introduces the high-pressure pulse gas into the non-contact rotary air knife; at the same time, the central control system controls the self-rotation drive component to drive the non-contact rotary air knife to rotate around the air knife main shaft, and controls the lifting cylinder to drive the non-contact rotary air knife to move up and down along the air knife main shaft. The high-pressure pulsed gas is ejected through the inclined micro-nozzle, impacting the top wall of the pulverizing chamber upwards. It then deflects along the top wall, flowing downwards and adhering to the inner wall of the pulverizing chamber. Driven by the high-speed rotating non-contact rotary air knife, it forms a three-dimensional spiral airflow inside the pulverizing chamber. The three-dimensional spiral airflow physically blows and scrapes away the residue adhering to the inner wall of the pulverizing chamber, the drive shaft, and the blade surface. During this period, the central control system controls the operation of the high-power industrial negative pressure fan at the bottom, applying continuous negative pressure suction to the inside of the pulverizing chamber through the lower pipeline; the inside of the pulverizing chamber forms an alternating pressure field under the combined action of the positive pressure gas input from the non-contact rotary air knife and the continuous negative pressure suction, causing high-frequency alternating changes in gas pressure, which in turn causes pressure imbalance inside the attached residue; the pressure imbalance reduces the adhesion of the attached residue to the inner wall surface of the pulverizing chamber and loosens it, and the three-dimensional spiral airflow peels the loosened attached residue off the inner wall of the pulverizing chamber.

[0010] Preferably, in the homologous fluidization cleaning stage: As the non-contact rotary air knife retracts into the air knife storage chamber, the central control system controls the bottom valve of the pulverizing chamber to close, thereby sealing the bottom discharge channel; subsequently, the central control system controls the feed valve to open; the homogeneous cleaning sample falls into the pulverizing chamber. After feeding is completed, the central control system controls the feeding valve to close. The central control system controls the operation of the pulverizing drive motor to perform mechanical grinding, transforming the homologous cleaning sample into a fine powder state to generate the homologous powder mixture; during and after mechanical grinding, the central control system controls the bottom valve of the pulverizing chamber to remain closed, blocking the bottom discharge channel, so that the homologous powder mixture is trapped inside the pulverizing chamber as the solid medium for the subsequent generation of the gas-solid two-phase fluid.

[0011] Preferably, in the homologous fluidization cleaning stage: In the homogeneous fluidization cleaning stage, the specific generation mechanism of the gas-solid two-phase fluid is as follows: After the homogeneous powder mixture is intercepted, the central control system controls the lifting cylinder to drive the non-contact rotary air knife to move downwards into the pulverizing chamber containing the homogeneous powder mixture; The central control system controls the intake control valve to alternately open and close at a preset frequency to input the high-pressure pulsed gas; at the same time, it controls the self-rotation drive component to drive the non-contact rotary air knife to rotate. The injected high-pressure pulsed gas is blown toward the homogeneous powder mixture at the bottom of the pulverizing chamber. The fluid kinetic energy overcomes the gravity and static friction of the homogeneous powder mixture, lifts it up and suspends it inside the pulverizing chamber, where it mixes with the high-pressure pulsed gas to form the gas-solid two-phase fluid.

[0012] Preferably, in the homogeneous fluidized bed cleaning stage, the physical scraping mechanism specifically includes: The suspended homogeneous powder mixture is fully mixed with the high-pressure pulsed gas to generate the gas-solid two-phase fluid; the central control system controls the lifting cylinder to drive the non-contact rotary air knife to reciprocate up and down along the main axis of the air knife, thereby driving the gas-solid two-phase fluid to circulate at high speed inside the pulverizing chamber. The homogeneous powder mixture serves as a solid-phase particle medium, continuously impacting the inner wall of the pulverizing chamber, the top wall of the pulverizing chamber, and the surface of the drive shaft and blades along with the gas-solid two-phase fluid. The introduction of the homologous powder mixture with the theoretical density of solid particles makes the equivalent physical density of the gas-solid two-phase fluid significantly greater than the fluid density of the single high-pressure pulsed gas, thereby generating a total dynamic impact force on the attached residue, and the value of the impact force is correspondingly increased. The increased total dynamic impact force overcomes the structural adhesion of the attached residue, forcibly peeling the attached residue from the inside of the pulverizing chamber, and mixing it with the gas-solid two-phase fluid inside the pulverizing chamber.

[0013] Preferably, during the negative pressure venting stage: The central control system controls the opening of the bottom valve of the pulverizing chamber; the central control system controls the air intake control valve to remain open and continuously inject the high-pressure pulse gas; at the same time, it controls the self-rotation drive component to continuously drive the non-contact rotary air knife to rotate, so as to maintain the fluidization disturbance state of the gas-solid two-phase fluid inside the pulverizing chamber. The central control system controls the operation of the high-power industrial negative pressure fan at the bottom to apply negative pressure suction to the inside of the pulverizing chamber; the positive pressure downward airflow formed by the high-pressure pulse gas and the negative pressure suction work together to form a downward directional exhaust flow field; The gas-solid two-phase fluid moves rapidly downward under the action of the directional venting flow field. The homogeneous powder mixture contained in the gas-solid two-phase fluid generates a physical scouring force on the inner surface of the pulverizing chamber bottom valve and the inner wall of the lower pipeline, washing away the residual attached residue and continuously conveying it downward, and finally discharging it all into the waste bin.

[0014] Preferably, during the system reset phase: After the venting is completed, the central control system controls the intake control valve to close, the self-rotation drive component to stop operating, and the bottom high-power industrial negative pressure fan to stop operating. The central control system controls the lifting cylinder to drive the non-contact rotary air knife to move upward until it is completely retracted into the air knife storage chamber; The central control system controls the bottom valve of the crushing chamber to close, completing the processing flow of the current raw grain sample to be tested; then, it determines that the next raw grain sample to be tested is to be tested, controls the feed valve to open again, and executes the feeding action to make the system enter a multi-sample continuous automated operation cycle.

[0015] This invention provides a method for automated cleaning of the grain sample crushing chamber and pipelines. It has the following beneficial effects: (1) By setting up an air knife storage chamber and a lifting cylinder, the lifting cylinder remains in the reset state during the feeding and mechanical grinding stages of the raw grain sample to be tested, so that the non-contact rotary air knife is completely retracted and placed inside the air knife storage chamber. This design effectively isolates the non-contact rotary air knife from the enclosed processing space, preventing substances inside the crushing chamber from entering the air knife storage chamber. This avoids cross-contamination of the raw grain sample to be tested by residues on the cleaning components, and effectively protects the precision non-contact rotary air knife and the tilted micro nozzle from physical impact and structural damage caused by splashing hard particles.

[0016] (2) In the homogeneous fluidized bed cleaning stage, the present invention utilizes homogeneous powder mixture and high-pressure pulse gas to form a gas-solid two-phase fluid. The introduction of homogeneous powder mixture makes the equivalent physical density of the gas-solid two-phase fluid significantly greater than the fluid density of a single high-pressure pulse gas, thereby greatly improving the total dynamic impact force. It can effectively overcome the structural adhesion of high-humidity and high-grease residues and forcibly peel them off. At the same time, the present invention is equipped with a PTFE microporous filter membrane. The positive pressure gas continuously input into the pulverizing chamber can be released to the outside through the PTFE microporous filter membrane. Its air permeability and solid dust interception characteristics accurately maintain the dynamic pressure balance inside the pulverizing chamber, fundamentally preventing the high-pressure airflow carrying dust from overflowing and backflowing to the outside of the chamber or the mechanical transmission area above.

[0017] (3) In the negative pressure evacuation stage, the present invention uses a high-power industrial negative pressure fan at the bottom to apply downward negative pressure suction through the lower pipeline, combined with a positive pressure downward airflow formed by the continuous injection of high-pressure pulsed gas by a non-contact rotary air knife, to construct a downward directional evacuation flow field. Under the strong constraint of the directional evacuation flow field, the gas-solid two-phase fluid moves downward rapidly, and the homogeneous powder mixture contained in it generates a strong physical scouring force on the inner surface of the crushing chamber bottom valve and the inner wall of the lower pipeline, forcibly washing away the residual attached residue and continuously conveying it downward, and finally discharging it all into the waste bin, realizing the complete emptying of the entire discharge channel without dead corners, and ensuring the accuracy of subsequent inspection data. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the system framework of the present invention; Figure 2 This is a schematic diagram of the method flow of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] See attached document Figure 1 This invention provides a method for automated cleaning of grain sample crushing chamber and pipelines. The method is based on a fully automatic grain pretreatment and self-cleaning system, which includes a central control system, a feed inlet, a crushing chamber, an air knife storage chamber, and a high-power industrial negative pressure fan at the bottom.

[0021] The feed inlet is connected to the inside of the crushing chamber. A feed valve is installed at the feed inlet. The raw grain sample to be tested enters the crushing chamber through the feed inlet. The crushing chamber is equipped with a drive shaft and blades. A crushing drive motor is installed on the outside of the crushing chamber. The crushing drive motor is connected to the drive shaft and blades. A crushing chamber bottom valve is installed at the bottom of the crushing chamber. A lower pipeline is connected below the crushing chamber bottom valve.

[0022] The top of the pulverizing chamber is equipped with an inner top wall.

[0023] The air knife storage chamber is equipped with a lifting cylinder and a non-contact rotary air knife. The air knife storage chamber is also equipped with a self-rotation drive assembly, which is connected to the non-contact rotary air knife. The non-contact rotary air knife has an air knife spindle, and the lifting cylinder drives the non-contact rotary air knife to perform vertical lifting and lowering movements.

[0024] The lifting cylinder drives the non-contact rotary air knife to extend downwards from the air knife storage chamber into the crushing chamber. The bottom and side walls of the non-contact rotary air knife are arrayed with inclined micro nozzles. The non-contact rotary air knife is connected to an external high-pressure air source, and an air intake control valve is installed in the air connection.

[0025] The system also includes a PTFE microporous filter membrane, a pulse solenoid valve, and an external air path. The outer side of the PTFE microporous filter membrane is connected to the outside atmosphere. One end of the external air path is connected to the outer side of the PTFE microporous filter membrane, and the other end is connected to a high-pressure backflush air source. The pulse solenoid valve is installed in the external air path. When the pulse solenoid valve is opened, the gas provided by the high-pressure backflush air source applies a reverse high-pressure airflow from the outside to the inside to the PTFE microporous filter membrane through the external air path.

[0026] A high-power industrial negative pressure fan is installed on the lower pipeline. The high-power industrial negative pressure fan is connected to the bottom valve of the crushing chamber through the lower pipeline. The end of the lower pipeline is connected to a waste bin.

[0027] The central control system is electrically connected to the feed valve, crushing drive motor, crushing chamber bottom valve, lifting cylinder, self-rotation drive assembly, air intake control valve, pulse solenoid valve, and bottom high-power industrial negative pressure fan.

[0028] Based on the above fully automated grain pretreatment and self-cleaning system, refer to the appendix. Figure 2 The present invention provides a method for automated cleaning of grain sample crushing chamber and pipeline, including a feeding crushing stage, a primary cleaning stage, a homogeneous fluidized bed cleaning stage, a negative pressure evacuation stage, and a system reset stage.

[0029] The central control system controls the opening of the feed valve, and the raw grain sample to be tested falls into the crushing chamber through the feed port. After the raw grain sample to be tested is fed, the central control system controls the closing of the feed valve.

[0030] The central control system controls the operation of the crushing drive motor, which drives the drive shaft and blades to rotate, crushing the raw grain sample to be tested and generating the initial crushed material. After the crushing process is completed, the central control system controls the bottom valve of the crushing chamber to open, and the initial crushed material is discharged from the crushing chamber.

[0031] After the initial pulverized material is discharged from the pulverizing chamber, the bottom valve of the pulverizing chamber remains open. The central control system controls the lifting cylinder to drive the non-contact rotary air knife to move downwards, and the non-contact rotary air knife enters the pulverizing chamber.

[0032] The central control system controls the air intake control valve to open, and the external high-pressure air source introduces high-pressure pulse gas into the non-contact rotary air knife. The central control system controls the self-rotation drive component to drive the non-contact rotary air knife to rotate, and controls the lifting cylinder to drive the non-contact rotary air knife to move up and down reciprocatingly. The tilted micro nozzle sprays out high-pressure pulse gas to peel off the attached residue inside the crushing chamber.

[0033] At the same time, the central control system controls the operation of the high-power industrial negative pressure fan at the bottom, and the attached residue enters the waste bin through the lower pipeline.

[0034] After the initial cleaning stage is completed, the central control system controls the bottom valve of the pulverizing chamber to close, the central control system controls the lifting cylinder to drive the non-contact rotary air knife to move upward and return to the air knife storage chamber, the central control system controls the feed valve to open, and the homogeneous cleaning sample falls into the pulverizing chamber through the feed port. The central control system controls the pulverizing drive motor to drive the drive shaft and blades to rotate, pulverizing the homogeneous cleaning sample to generate a homogeneous powder mixture.

[0035] After the homogeneous powder mixture is generated, the bottom valve of the crushing chamber remains closed. The central control system controls the lifting cylinder to drive the non-contact rotary air knife downward into the crushing chamber. The central control system controls the air intake control valve to open, and the non-contact rotary air knife sprays out high-pressure pulse gas. The high-pressure pulse gas mixes with the homogeneous powder mixture to form a gas-solid two-phase fluid. The gas-solid two-phase fluid physically scrapes the attached residue inside the crushing chamber.

[0036] After the physical scraping action continues for a preset time, the central control system controls the bottom valve of the crushing chamber to open, the air intake control valve to remain open, and the central control system controls the operation of the high-power industrial negative pressure fan at the bottom. The homogeneous powder mixture with attached residue passes through the bottom valve of the crushing chamber and the lower pipeline into the waste bin.

[0037] After the evacuation is completed, the central control system controls the air intake control valve to close and controls the self-rotation drive component to stop operating. The central control system controls the lifting cylinder to drive the non-contact rotary air knife to move upward and return to the air knife storage chamber. The central control system controls the bottom valve of the crushing chamber to close and controls the high-power industrial negative pressure fan at the bottom to stop operating. The fully automatic grain pretreatment and self-cleaning system completes the status reset.

[0038] Furthermore, during the feeding and crushing stage, the central control system controls the opening of the feeding valve.

[0039] The raw grain sample to be tested enters the crushing chamber through the feed inlet.

[0040] After the raw grain sample to be tested is fed, the central control system controls the feed valve to close.

[0041] During this stage, the lifting cylinder remains in the reset state, and the non-contact rotary air knife is placed inside the air knife storage chamber to prevent the raw grain sample to be tested from coming into contact with the non-contact rotary air knife. This prevents cross-contamination of the raw grain sample to be tested and protects the non-contact rotary air knife from structural damage.

[0042] The central control system keeps the bottom valve of the crushing chamber closed and controls the crushing drive motor to run. The crushing drive motor drives the drive shaft and blades to rotate inside the crushing chamber.

[0043] The drive shaft and blades mechanically grind the raw grain sample to be tested, converting it into a primary pulverized material. The sealed processing space prevents the primary pulverized material from scattering into the external environment of the grinding chamber. After grinding, the primary pulverized material and the high-moisture and high-oil components of the raw grain sample to be tested adhere to the inner wall of the grinding chamber, the drive shaft, and the blade surface, forming adhering residue.

[0044] Furthermore, after the attached residue is formed, the system enters the primary cleaning stage, and the central control system controls the bottom valve of the pulverizing chamber to remain open.

[0045] The central control system controls the lifting cylinder to drive the non-contact rotary air knife to move downwards, allowing the non-contact rotary air knife to enter the crushing chamber.

[0046] The central control system controls the air intake control valve to open and close alternately at a preset frequency, so that the external high-pressure air source introduces high-pressure pulsed gas into the non-contact rotary air knife. At the same time, the central control system controls the self-rotation drive component to drive the non-contact rotary air knife to rotate around the air knife main shaft, and controls the lifting cylinder to drive the non-contact rotary air knife to move up and down along the air knife main shaft.

[0047] High-pressure pulsed gas is ejected through an inclined micro-nozzle. The high-pressure pulsed gas ejected from the inclined micro-nozzle impacts the top wall of the crushing chamber upwards. The high-pressure pulsed gas is deflected along the top wall of the crushing chamber and flows downwards, adhering to the inner wall of the crushing chamber. Driven by the high-speed rotating non-contact rotary air knife, a three-dimensional spiral airflow is formed inside the crushing chamber. The three-dimensional spiral airflow physically blows and scrapes the residues adhering to the inner wall of the crushing chamber, as well as the drive shaft and blade surface.

[0048] The central control system controls the pulse solenoid valve to alternately perform opening and closing actions at a preset frequency. When the pulse solenoid valve is open, the high-pressure backflush air source applies reverse high-pressure airflow to the PTFE microporous filter membrane through the outer air passage, shaking off the deposits and residues attached to the surface of the PTFE microporous filter membrane.

[0049] The central control system adjusts the opening sequence of the intake control valve and the pulse solenoid valve to maintain a preset phase difference between the injection pulse frequency of the high-pressure pulse gas and the backflush pulse frequency of the pulse solenoid valve. During this period, the central control system controls the operation of the high-power industrial negative pressure fan at the bottom to apply continuous negative pressure suction to the inside of the crushing chamber through the lower pipeline.

[0050] Inside the pulverizing chamber, the positive pressure gas input from the non-contact rotary air knife and the continuous negative pressure suction from the high-power industrial negative pressure fan at the bottom create an alternating pressure field. This alternating pressure field causes high-frequency alternating changes in the gas pressure inside the pulverizing chamber, leading to pressure imbalance within the attached residue.

[0051] Pressure imbalance reduces the adhesion of the attached residue to the inner wall of the crushing chamber and loosens it. The three-dimensional spiral airflow peels the loosened residue off the inner wall of the crushing chamber. The peeled residue is driven by the airflow of the high-power industrial negative pressure fan at the bottom, passes through the bottom valve of the crushing chamber and the lower pipeline and is discharged into the waste bin. After cleaning, the central control system controls the non-contact rotary air knife to move upward and return to the air knife storage chamber.

[0052] When the non-contact rotary air knife retracts into the air knife storage chamber, the system enters the homogeneous fluidized bed cleaning stage.

[0053] The central control system controls the bottom valve of the crushing chamber to close in advance, thereby sealing the bottom discharge channel of the crushing chamber. Subsequently, the central control system controls the feed valve to open, and the homogeneous cleaning sample falls into the crushing chamber through the feed port.

[0054] After the homogeneous cleaning sample is fed, the central control system controls the feed valve to close, at which point the inside of the pulverizing chamber is constructed as a closed physical space.

[0055] The central control system controls the operation of the pulverizing drive motor, which drives the drive shaft and blades to rotate inside the pulverizing chamber to mechanically grind the homogeneous cleaning samples.

[0056] The homogeneous cleaning sample is mechanically ground into a fine powder state, generating a homogeneous powder mixture. During and after mechanical grinding, the central control system controls the bottom valve of the grinding chamber to remain closed, blocking the path of the homogeneous powder mixture to the lower pipeline. The homogeneous powder mixture is thus trapped inside the grinding chamber and serves as the solid medium for the subsequent generation of gas-solid two-phase fluid.

[0057] The homologous powder mixture is trapped inside the pulverizing chamber, serving as the solid medium for the subsequent generation of a gas-solid two-phase fluid.

[0058] The central control system controls the lifting cylinder to drive the non-contact rotary air knife to move downwards, so that the non-contact rotary air knife enters the pulverizing chamber containing the same powder mixture.

[0059] The central control system controls the air intake control valve to open and close alternately at a preset frequency, so that the external high-pressure air source inputs high-pressure pulse gas into the non-contact rotary air knife. At the same time, the central control system controls the self-rotation drive component to drive the non-contact rotary air knife to rotate around the air knife main shaft. The high-pressure pulse gas is sprayed into the crushing chamber through the inclined micro nozzle of the non-contact rotary air knife.

[0060] The injected high-pressure pulsed gas blows towards the homogeneous powder mixture at the bottom of the pulverizing chamber. By using fluid kinetic energy to overcome the gravity and static friction of the homogeneous powder mixture, the homogeneous powder mixture is rolled up and suspended inside the pulverizing chamber, where it mixes with the high-pressure pulsed gas to form a gas-solid two-phase fluid.

[0061] During this process, the positive pressure gas continuously input into the pulverizing chamber is released to the outside through the PTFE microporous filter membrane. The PTFE microporous filter membrane is permeable and intercepts solid dust, maintaining the dynamic pressure balance inside the pulverizing chamber and preventing suspended dust from overflowing and backflowing into the air knife storage chamber above.

[0062] The suspended homogeneous powder mixture is fully mixed with high-pressure pulsed gas to generate a gas-solid two-phase fluid inside the pulverizing chamber. The central control system controls the lifting cylinder to drive the non-contact rotary air knife to move up and down along the main axis of the air knife, causing the gas-solid two-phase fluid to circulate at high speed inside the pulverizing chamber.

[0063] The homogeneous powder mixture serves as a solid-phase particle medium, continuously impacting the inner wall of the pulverizing chamber, the top wall of the pulverizing chamber, and the surfaces of the drive shaft and blades along with the gas-solid two-phase fluid, applying physical impact and frictional scraping forces to the residues attached to these surfaces.

[0064] The physical impact force and friction scraping force destroy the surface bonding structure of the attached residue, forcibly peeling the attached residue from the inner wall of the crushing chamber, the top wall of the crushing chamber, and the surface of the drive shaft and blades. The peeled attached residue tumbles and mixes with the gas-solid two-phase fluid inside the crushing chamber, completing the physical scraping and cleaning process inside the crushing chamber.

[0065] The aforementioned peeled residue is tumbled and mixed with the gas-solid two-phase fluid inside the pulverizing chamber, completing the physical scraping and cleaning process inside the pulverizing chamber. The physical impact force exerted by the gas-solid two-phase fluid on the residue is generated based on the gas-solid two-phase fluid dynamics mechanism.

[0066] The total dynamic impact force generated by the gas-solid two-phase fluid on the inner wall of the pulverizing chamber, the top wall of the pulverizing chamber, and the surfaces of the drive shaft and blades satisfies the following kinetics. Relationship: In the formula, The total dynamic impact force of the gas-solid two-phase fluid acting on the surface of the attached residue. This represents the fluid resistance coefficient corresponding to the surface of the attached residue; The equivalent physical density of the gas-solid two-phase fluid; The total effective contact area between the gas-solid two-phase fluid and the surface of the attached residue; The velocity of the gas-solid two-phase fluid when it reaches the surface of the attached residue under the drive of a non-contact rotary air knife.

[0067] The gas-solid two-phase fluid is composed of a mixture of homologous powders in the solid phase and a high-pressure pulsed gas in the gas phase, and its equivalent physical density... The following mass-volume relationship must be satisfied: In the formula, The equivalent physical density of the gas-solid two-phase fluid; The volume fraction of the homologous powder mixture in the gas-solid two-phase fluid is a variable; The theoretical density of solid particles in a mixture of homologous powders; This refers to the fluid density of the high-pressure pulsed gas ejected by a non-contact rotary air knife.

[0068] Volume fraction change when only high-pressure pulsed gas is introduced for purging Approaching zero, equivalent physical density The fluid density is approximately equal to that of the high-pressure pulsed gas. After a homogeneous powder mixture is introduced into the pulverizing chamber, the mixture is suspended in the high-pressure pulsed gas to form a gas-solid two-phase fluid with a variable volume fraction. Convert to a value greater than zero.

[0069] Due to the theoretical density of solid particles in homologous powder mixtures Fluid density much greater than that of high-pressure pulsed gas Therefore, the introduction of homologous powder mixtures increases the equivalent physical density of the gas-solid two-phase fluid. The fluid density is significantly greater than that of a single high-pressure pulse gas. .

[0070] The same mixing fluid velocity is provided by a non-contact rotary air knife. Under the condition of, equivalent physical density The increase causes total dynamic impact force The value increases accordingly, increasing the total dynamic impact force. The physical process of overcoming the structural adhesion of the attached residue on the inner wall of the crushing chamber, the top wall of the crushing chamber, and the surfaces of the drive shaft and blades, and removing the attached residue from the aforementioned structural surfaces.

[0071] The increased total dynamic impact force After overcoming the structural adhesion of the attached residue on the inner wall of the crushing chamber, the top wall of the crushing chamber, and the surfaces of the drive shaft and blades, and achieving the physical process of removing the attached residue from the above-mentioned structural surfaces, the system enters the negative pressure pipeline washing and dead-angle-free evacuation stage.

[0072] The central control system controls the bottom valve of the pulverizing chamber to open. During this stage, the central control system controls the air intake control valve to remain open, so that the non-contact rotary air knife continuously sprays high-pressure pulsed gas into the pulverizing chamber through the tilted micro nozzle. At the same time, the central control system controls the self-rotation drive component to continuously drive the non-contact rotary air knife to rotate, so as to maintain the fluidization disturbance state of the gas-solid two-phase fluid inside the pulverizing chamber.

[0073] Subsequently, the central control system controls the operation of the high-power industrial negative pressure fan at the bottom, which applies downward negative pressure suction to the inside of the pulverizing chamber through the lower pipeline. The high-pressure pulse gas injected by the non-contact rotating air knife forms a positive pressure downward airflow above the pulverizing chamber. The positive pressure downward airflow and the negative pressure suction generated by the high-power industrial negative pressure fan at the bottom work together to form a downward directional exhaust flow field inside the pulverizing chamber and the lower pipeline.

[0074] Under the action of the directional venting flow field, the gas-solid two-phase fluid moves rapidly downward from inside the pulverizing chamber, carrying the peeled-off residue and homogeneous powder mixture through the bottom valve of the pulverizing chamber and into the lower pipeline.

[0075] When the gas-solid two-phase fluid flows through the pulverizing chamber bottom valve and the lower pipeline, the homogeneous powder mixture contained in the gas-solid two-phase fluid generates a physical scouring force on the inner surface of the pulverizing chamber bottom valve and the inner wall of the lower pipeline, washing away the residues attached to the pulverizing chamber bottom valve and the lower pipeline and continuously conveying them downward.

[0076] Finally, the gas-solid two-phase fluid, carrying the homologous powder mixture and attached residue, passes through the end of the lower pipeline and is completely discharged into the waste bin, completing the emptying of the crushing chamber and the lower pipeline.

[0077] After the internal parts of the pulverizing chamber and the lower pipeline are emptied, the central control system closes the air intake control valve, stopping the external high-pressure air source from supplying high-pressure pulsed gas to the non-contact rotary air knife. Simultaneously, the central control system stops the rotation drive assembly, halting the rotation of the non-contact rotary air knife. Subsequently, the central control system stopped the high-power industrial negative pressure fan at the bottom to release the negative pressure suction inside the crushing chamber and the lower pipeline.

[0078] The central control system controls the lifting cylinder to drive the non-contact rotary air knife to move upward until the non-contact rotary air knife is completely retracted into the air knife storage chamber.

[0079] The central control system closes the bottom valve of the crushing chamber, and all mechanical moving parts and pneumatic control valves of the fully automatic grain pretreatment and self-cleaning system return to their initial standby state, completing the processing flow of the current raw grain sample to be tested.

[0080] Subsequently, the central control system determines that the next processing cycle of the raw grain sample to be tested has begun, and controls the feed valve to open again to execute the feeding action of the next raw grain sample to be tested into the crushing chamber, so that the fully automatic grain pretreatment and self-cleaning system enters a multi-sample continuous automatic operation cycle.

[0081] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A system for automated cleaning of grain sample crushing chambers and pipelines, characterized in that, Includes a central control system, feed inlet, crushing chamber, air knife storage chamber, and a high-power industrial negative pressure fan at the bottom; The crushing chamber has a top, an interior, an exterior, a bottom, and an inner wall. The top of the crushing chamber has an inner top wall. A drive shaft and blades are installed inside the crushing chamber. A crushing drive motor is installed outside the crushing chamber, and the drive motor is connected to the drive shaft and blades. A bottom discharge channel is provided at the bottom of the crushing chamber, and a bottom valve is installed at the bottom discharge channel. The bottom valve has an inner surface, and a lower pipe is connected below the bottom valve. The lower pipe has an inner wall, and its end is connected to a waste bin. The feed inlet is located at the top of the crushing chamber and is equipped with a feed valve; the feed inlet is directly connected to the interior of the crushing chamber. The air knife storage chamber has an interior; the air knife storage chamber is vertically installed on one side of the top of the pulverizing chamber; the air knife storage chamber is equipped with a lifting cylinder, a non-contact rotary air knife, and a self-rotation drive assembly; the self-rotation drive assembly is connected to the non-contact rotary air knife; the non-contact rotary air knife has an air knife spindle, a bottom end, and a side wall; the bottom end and the side wall of the non-contact rotary air knife are arrayed with inclined micro nozzles; the lifting cylinder is used to drive the non-contact rotary air knife to move vertically up and down, so that the non-contact rotary air knife can pass through the top wall of the pulverizing chamber and enter the interior of the pulverizing chamber; the non-contact rotary air knife is connected to an external high-pressure air source through a connecting air passage, and an air intake control valve is installed in the connecting air passage; The high-power industrial negative pressure fan at the bottom is installed on the lower pipeline, and the high-power industrial negative pressure fan at the bottom is connected to the bottom valve of the pulverizing chamber through the lower pipeline; The central control system is electrically connected to the feed valve, the crushing drive motor, the crushing chamber bottom valve, the lifting cylinder, the self-rotation drive assembly, the air intake control valve, the pulse solenoid valve, and the bottom high-power industrial negative pressure fan.

2. A method for automated cleaning of grain sample crushing chambers and pipelines, characterized in that, Based on the system implementation of claim 1, the method includes a feeding and crushing stage, a primary cleaning stage, a homogeneous fluidized bed cleaning stage, a negative pressure evacuation stage, and a system reset stage. The feeding and crushing stage includes: the central control system controls the raw grain sample to be tested to fall into the crushing chamber, the crushing drive motor drives the drive shaft and blades to rotate to crush the raw grain sample to be tested to generate the initial crushed material, and the attached residue is formed inside the crushing chamber, and then the initial crushed material is discharged. The initial cleaning stage includes: the central control system controlling the non-contact rotary air knife to enter the pulverizing chamber; the air intake control valve opening to allow the external high-pressure air source to supply high-pressure pulsed gas to the non-contact rotary air knife; the self-rotation drive assembly driving the non-contact rotary air knife to rotate; and the inclined micro-nozzle spraying the high-pressure pulsed gas to peel off the attached residue; and the bottom high-power industrial negative pressure fan operating to discharge the attached residue. The homogeneous fluidized bed cleaning stage includes: the central control system controlling the homogeneous cleaning sample to fall into the pulverizing chamber; the pulverizing drive motor driving the drive shaft and blades to rotate and pulverize the homogeneous cleaning sample to generate a homogeneous powder mixture; the central control system controlling the non-contact rotary air knife to spray the high-pressure pulsed gas; the high-pressure pulsed gas and the homogeneous powder mixture to form a gas-solid two-phase fluid to physically scrape the attached residue inside the pulverizing chamber; The negative pressure venting stage includes: the central control system controlling the operation of the high-power industrial negative pressure fan at the bottom, and the homogeneous powder mixture with the attached residue passing through the bottom valve of the crushing chamber and the lower pipeline into the waste bin; The system reset phase includes: the central control system controlling the non-contact rotary air knife to retract into the air knife storage chamber, and the system completing the state reset.

3. The method for automated cleaning of grain sample crushing chamber and pipelines according to claim 2, characterized in that: In the feeding and crushing stage: The central control system controls the opening of the feed valve; the raw grain sample to be tested falls into the crushing chamber through the feed inlet; After the raw grain sample to be tested is fed, the central control system controls the feeding valve to close; the central control system controls the bottom valve of the crushing chamber to remain closed, and controls the crushing drive motor to run, driving the drive shaft and blades to rotate inside the crushing chamber to mechanically grind the raw grain sample to be tested; After grinding, the initial pulverized material and the high-moisture, high-oil components of the raw grain sample to be tested adhere to the inner wall of the grinding chamber, the drive shaft, and the surface of the blades, forming the attached residue; subsequently, the central control system controls the bottom valve of the grinding chamber to open and discharge the initial pulverized material.

4. The method for automated cleaning of grain sample crushing chamber and pipelines according to claim 3, characterized in that: In the initial cleaning stage: After the attached residue is formed, the central control system controls the bottom valve of the pulverizing chamber to remain open; the central control system controls the lifting cylinder to drive the non-contact rotary air knife to move downwards into the pulverizing chamber. The central control system controls the air intake control valve to open and close alternately at a preset frequency, so that the external high-pressure air source introduces the high-pressure pulse gas into the non-contact rotary air knife; at the same time, the central control system controls the self-rotation drive component to drive the non-contact rotary air knife to rotate around the air knife main shaft, and controls the lifting cylinder to drive the non-contact rotary air knife to move up and down along the air knife main shaft. The high-pressure pulsed gas is ejected through the inclined micro-nozzle, impacting the top wall of the pulverizing chamber upwards. It then deflects along the top wall, flowing downwards and adhering to the inner wall of the pulverizing chamber. Driven by the high-speed rotating non-contact rotary air knife, it forms a three-dimensional spiral airflow inside the pulverizing chamber. The three-dimensional spiral airflow physically blows and scrapes away the residue adhering to the inner wall of the pulverizing chamber, the drive shaft, and the blade surface. During this period, the central control system controls the operation of the high-power industrial negative pressure fan at the bottom, applying continuous negative pressure suction to the inside of the pulverizing chamber through the lower pipeline; the inside of the pulverizing chamber forms an alternating pressure field under the combined action of the positive pressure gas input from the non-contact rotary air knife and the continuous negative pressure suction, causing high-frequency alternating changes in gas pressure, which in turn causes pressure imbalance inside the attached residue; the pressure imbalance reduces the adhesion of the attached residue to the inner wall surface of the pulverizing chamber and loosens it, and the three-dimensional spiral airflow peels the loosened attached residue off the inner wall of the pulverizing chamber.

5. The method for automated cleaning of the grain sample crushing chamber and pipelines according to claim 4, characterized in that: In the aforementioned homogeneous fluidization cleaning stage: As the non-contact rotary air knife retracts into the air knife storage chamber, the central control system controls the bottom valve of the crushing chamber to close, thereby sealing the bottom discharge channel; subsequently, the central control system controls the feed valve to open. The homologous cleaning sample falls into the pulverizing chamber; After feeding is completed, the central control system controls the feeding valve to close. The central control system controls the operation of the pulverizing drive motor to perform mechanical grinding, transforming the homologous cleaning sample into a fine powder state to generate the homologous powder mixture; during and after mechanical grinding, the central control system controls the bottom valve of the pulverizing chamber to remain closed, blocking the bottom discharge channel, so that the homologous powder mixture is trapped inside the pulverizing chamber as the solid medium for the subsequent generation of the gas-solid two-phase fluid.

6. The method for automated cleaning of the grain sample crushing chamber and pipelines according to claim 5, characterized in that: In the homogeneous fluidization cleaning stage, the specific generation mechanism of the gas-solid two-phase fluid is as follows: After the homogeneous powder mixture is intercepted, the central control system controls the lifting cylinder to drive the non-contact rotary air knife to move downwards into the pulverizing chamber containing the homogeneous powder mixture; The central control system controls the intake control valve to alternately open and close at a preset frequency to input the high-pressure pulsed gas; at the same time, it controls the self-rotation drive component to drive the non-contact rotary air knife to rotate. The injected high-pressure pulsed gas is blown toward the homogeneous powder mixture at the bottom of the pulverizing chamber. The fluid kinetic energy overcomes the gravity and static friction of the homogeneous powder mixture, lifts it up and suspends it inside the pulverizing chamber, where it mixes with the high-pressure pulsed gas to form the gas-solid two-phase fluid.

7. The method for automated cleaning of grain sample crushing chamber and pipelines according to claim 6, characterized in that: In the aforementioned homogeneous fluidized bed cleaning stage, the physical scraping mechanism specifically includes: The suspended homogeneous powder mixture is fully mixed with the high-pressure pulsed gas to generate the gas-solid two-phase fluid; the central control system controls the lifting cylinder to drive the non-contact rotary air knife to reciprocate up and down along the main axis of the air knife, thereby driving the gas-solid two-phase fluid to circulate at high speed inside the pulverizing chamber. The homogeneous powder mixture serves as a solid-phase particle medium, continuously impacting the inner wall of the pulverizing chamber, the top wall of the pulverizing chamber, and the surface of the drive shaft and blades along with the gas-solid two-phase fluid. The introduction of the homologous powder mixture with the theoretical density of solid particles makes the equivalent physical density of the gas-solid two-phase fluid significantly greater than the fluid density of the single high-pressure pulsed gas, thereby generating a total dynamic impact force on the attached residue, and the value of the impact force is correspondingly increased. The increased total dynamic impact force overcomes the structural adhesion of the attached residue, forcibly peeling the attached residue from the inside of the pulverizing chamber, and mixing it with the gas-solid two-phase fluid inside the pulverizing chamber.

8. The method for automated cleaning of the grain sample crushing chamber and pipelines according to claim 7, characterized in that: During the negative pressure venting stage: The central control system controls the opening of the bottom valve of the pulverizing chamber; the central control system controls the air intake control valve to remain open and continuously inject the high-pressure pulse gas; at the same time, it controls the self-rotation drive component to continuously drive the non-contact rotary air knife to rotate, so as to maintain the fluidization disturbance state of the gas-solid two-phase fluid inside the pulverizing chamber. The central control system controls the operation of the high-power industrial negative pressure fan at the bottom to apply negative pressure suction to the inside of the pulverizing chamber; The positive pressure downward airflow formed by the ejected high-pressure pulsed gas, together with the negative pressure suction, forms a downward directional exhaust flow field; The gas-solid two-phase fluid moves rapidly downward under the action of the directional venting flow field. The homogeneous powder mixture contained in the gas-solid two-phase fluid generates a physical scouring force on the inner surface of the pulverizing chamber bottom valve and the inner wall of the lower pipeline, washing away the residual attached residue and continuously conveying it downward, and finally discharging it all into the waste bin.

9. The method for automated cleaning of grain sample crushing chamber and pipelines according to claim 8, characterized in that: During the system reset phase: After the venting is completed, the central control system controls the intake control valve to close, the self-rotation drive component to stop operating, and the bottom high-power industrial negative pressure fan to stop operating. The central control system controls the lifting cylinder to drive the non-contact rotary air knife to move upward until it is completely retracted into the air knife storage chamber; The central control system controls the pulverizing chamber bottom valve to close, completing the processing flow of the current raw grain sample to be tested; Subsequently, the system determines that it is entering the next processing cycle for the raw grain sample to be tested, controls the feed valve to open again, and executes the feeding action to enable the system to enter a multi-sample continuous automated operation cycle.

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