Self-cleaning detection equipment for detecting lactic acid in liquor yeast

Abstract

The invention relates to the technical field of lactic acid detection, in particular to self-cleaning detection equipment for detecting lactic acid in liquor yeast, which comprises a sampling bottle, a sampling tube and an ion mobility spectrometer, the valve body is arranged between the ion mobility spectrometer and the sampling tube; the flow guide pipe is obliquely arranged on the side wall of the sampling bottle, and the end, close to the sampling pipe, of the flow guide pipe is lower than the end, away from the sampling pipe, of the flow guide pipe; the dropper is vertically arranged on one side of the flow guide pipe and communicated with the upper end of the flow guide pipe, a storage cavity for communicating the dropper with the flow guide pipe is formed between the dropper and the flow guide pipe, and the height of the bottom of the storage cavity is the same as that of the upper end of the flow guide pipe; the pump body is arranged on the upper portion of the storage cavity and used for pumping out air in the storage cavity or injecting air into the storage cavity. According to the method, the manual operation intensity is reduced, and the overall working efficiency and data reliability of lactic acid detection in yeast for making hard liquor are improved.

Description

Technical Field

[0001] This invention relates to the field of lactic acid detection technology, specifically to a self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture for Chinese liquor). Background Technology

[0002] In existing technologies, the main methods for detecting lactic acid content in Daqu (a type of starter culture) include liquid chromatography, benzyl esterification, ion chromatography, and near-infrared spectroscopy. However, using ion mobility spectrometry (IMP) for lactic acid analysis in Daqu and fermented mash offers a simple and time-saving sample pretreatment process, eliminates the need for filtration, and avoids detector contamination and column clogging.

[0003] For example, Chinese Patent Publication No. CN114624324B discloses a method for rapid detection of lactic acid in baijiu daqu and mash using an ion mobility spectrometer. The method uses a negative ion mode ion mobility spectrometer for detection and includes the following steps: (1) Lactic acid standard analysis: take lactic acid standard and detect it using a negative ion mode ion mobility spectrometer to obtain the peak migration time spectrum of lactic acid; (2) Sample pretreatment: use isopropanol, which is selective for ionization of air reagent ions in the negative ion mode ion mobility spectrometer, as the extraction solvent to dissolve the sample; (3) Sample analysis: the sample obtained in step (2) is detected in the negative ion mode of the ion mobility spectrometer. Based on the comparison between the obtained sample peak migration time and the lactic acid signal peak migration time in the spectrum in step (1), the target peak tracking signal intensity data is selected for quantitative analysis.

[0004] However, when using ion mobility spectrometry (IMP) to detect lactic acid, isopropanol containing dissolved lactic acid needs to be added to a sampling bottle, and the sampling tube from the instrument needs to be inserted into the bottle from the top. To improve the accuracy of the detection, the lactic acid needs to be diluted with isopropanol to produce samples of different concentrations for testing. Each time a different concentration of sample is tested, the sampling bottle needs to be removed, a different concentration of sample added, and then the sampling bottle reconnected to the instrument. The operation is cumbersome and requires repeating the process of loading and unloading the sampling bottle. Summary of the Invention

[0005] To address the aforementioned issues, a self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture) is provided. By utilizing the coordinated operation of the valve body, guide tube, dropper, storage chamber, and pump body, the operation process for lactic acid detection is effectively simplified, achieving automated quantitative delivery and precise dispensing of lactic acid samples. It eliminates the need for repeated manual disassembly and assembly of sampling bottles or manual sample addition, reducing the intensity of manual operation and avoiding the risks of cross-contamination and concentration deviation caused by manual contact.

[0006] To address the problems of existing technologies, this invention provides a self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture), comprising a sampling bottle, a sampling tube, and an ion mobility spectrometer.

[0007] The testing equipment also includes:

[0008] A valve body is disposed between the ion mobility spectrometer and the sampling tube;

[0009] A flow guide tube is inclinedly disposed on the side wall of the sampling bottle, with the end of the flow guide tube closer to the sampling tube being lower than the end farther away from the sampling tube;

[0010] A dropper is vertically disposed on one side of the guide tube and communicates with the upper end of the guide tube. A storage cavity is provided between the dropper and the guide tube to connect the two. The bottom height of the storage cavity is the same as the upper end height of the guide tube.

[0011] A pump body is disposed at the upper part of the storage cavity and is used to extract air from the storage cavity or inject air into the storage cavity.

[0012] Preferably, the guide tube extends into the sampling bottle from one end toward the sampling bottle.

[0013] Preferably, the lower end of the sampling tube has a flared structure that is vertically downward.

[0014] Preferably, the testing equipment further includes:

[0015] A lifting frame is located below the dropper;

[0016] A storage bottle, located on the upper part of the lifting frame, is used to store isopropanol samples containing dissolved lactic acid.

[0017] The first linear actuator, located on one side of the lifting frame, is used to drive the lifting frame to move vertically.

[0018] Preferably, a cleaning chamber is also provided on the upper part of the lifting frame, and a drain outlet for discharging sewage is provided at the bottom of the cleaning chamber, and a switch valve is provided on the drain outlet.

[0019] Preferably, the side wall of the cleaning chamber is provided with an inlet for isopropanol vapor to be discharged.

[0020] Preferably, both the storage bottle and the cleaning chamber have openings at their upper parts, and rubber membranes are provided at the openings of both the storage bottle and the cleaning chamber. A through hole for the dropper to pass through is provided at the center of the rubber membrane, and the diameter of the through hole is smaller than the diameter of the dropper.

[0021] Preferably, a reinforcing ring is provided at the lower part of the rubber membrane along the axial direction of the through hole.

[0022] Preferably, the lifting frame is provided with a limiting ring for limiting the position of the storage bottle.

[0023] Preferably, multiple storage bottles are arranged horizontally, and a second linear driver is provided below the lifting frame and the first linear driver to drive them to move synchronously in the horizontal direction.

[0024] The advantages of this invention compared to the prior art are:

[0025] 1. This invention, through the coordinated operation of the valve body, guide tube, dropper, storage chamber, and pump body, effectively simplifies the operation process of lactic acid detection, achieving automated quantitative delivery and precise dispensing of lactic acid samples. It eliminates the need for repeated manual disassembly and assembly of sampling bottles or manual sample addition, reducing the intensity of manual operation and avoiding the risks of cross-contamination and concentration deviation caused by manual contact. Simultaneously, the height matching design of the bottom of the storage chamber and the top of the guide tube, combined with the inclined arrangement of the guide tube, ensures that the sample solution flows smoothly and accurately to the bottom of the sampling bottle by gravity. This lays the foundation for the efficient and complete extraction of volatile gases by ion mobility spectrometry, improving the overall efficiency and data reliability of lactic acid detection in Daqu (a type of Chinese liquor).

[0026] 2. By utilizing the structure of the guide tube extending into the sampling bottle, the flared structure at the lower end of the sampling tube, and the internal airflow constraint formed by the storage chamber and the guide tube, the path of external air entering the sampling bottle is effectively blocked, preventing the sample's volatile gases from being diluted by the outside air. The extended design of the guide tube ensures that the sample does not splash, and the flared structure expands the gas collection range, further improving gas extraction efficiency and signal reception strength. The entire process from sample delivery to gas collection ensures the accuracy, stability, and reliability of the detection results, fully meeting the high-precision requirements of lactic acid quantitative analysis.

[0027] 3. By relying on the automated supporting structure of the lifting frame, first linear actuator, second linear actuator, storage bottle, and cleaning chamber, automatic switching of sampling for samples of different concentrations and self-cleaning maintenance of the equipment are achieved, perfectly adapting to the needs of continuous batch testing. The cooperation between the lifting frame and the linear actuator can accurately drive the storage bottle or cleaning chamber to automatically dock and separate from the dropper without manual intervention; combined with the sealing and cleaning design of the cleaning chamber, drain port, and rubber membrane, residual samples in the tubing can be quickly and thoroughly removed after testing, avoiding cross-contamination, while effectively slowing down solvent evaporation and ensuring stable sample concentration, further improving the automation and intelligence level of the equipment and enhancing its practicality and versatility. Attached Figure Description

[0028] Figure 1 This is a three-dimensional schematic diagram of a self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture) according to the present invention. Figure 1 .

[0029] Figure 2This is a three-dimensional schematic diagram of a self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture) according to the present invention. Figure 2 .

[0030] Figure 3 This is a three-dimensional schematic diagram of a self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture) of the present invention, after removing part of the support frame. Figure 1 .

[0031] Figure 4 This is a three-dimensional schematic diagram of a self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture) of the present invention, after removing part of the support frame. Figure 2 .

[0032] Figure 5 This is a three-dimensional schematic diagram of a self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture) according to the present invention, after removing the guide tube, the first linear actuator, and the second linear actuator.

[0033] Figure 6 This is a side view of a self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture) according to the present invention.

[0034] Figure 7 This invention relates to a self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture used in traditional Chinese liquor production). Figure 6 Schematic diagram of cross-section at point AA.

[0035] Figure 8 This is a cross-sectional three-dimensional schematic diagram of a self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture) according to the present invention.

[0036] The following are the labels in the diagram: 1. Sampling bottle; 2. Ion mobility spectrometer; 21. Sampling tube; 22. Valve body; 3. Guide tube; 4. Dropper; 41. Storage chamber; 5. Lifting frame; 51. Storage bottle; 52. Cleaning chamber; 521. Drain outlet; 522. Switch valve; 523. Discharge inlet; 53. Rubber membrane; 531. Reinforcing ring; 54. Limiting ring; 6. First linear actuator; 7. Second linear actuator. Detailed Implementation

[0037] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0038] Reference Figures 1 to 4 and Figures 6 to 8 A self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture for Chinese liquor), comprising a sampling bottle 1, a sampling tube 21, and an ion mobility spectrometer 2;

[0039] The testing equipment also includes:

[0040] Valve body 22 is disposed between the ion mobility spectrometer 2 and the sampling tube 21;

[0041] The guide tube 3 is inclinedly disposed on the side wall of the sampling bottle 1, with the end of the guide tube 3 closer to the sampling tube 21 being lower than the end farther away from the sampling tube 21;

[0042] The dropper 4 is vertically arranged on one side of the guide tube 3 and communicates with the upper end of the guide tube 3. There is a storage cavity 41 between the dropper 4 and the guide tube 3, and the bottom height of the storage cavity 41 is the same as the upper end height of the guide tube 3.

[0043] A pump body is disposed at the upper part of the storage chamber 41 and is used to extract air from the storage chamber 41 or inject air into the storage chamber 41.

[0044] This self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture) first starts the pump while valve 22 is closed, and the ion mobility spectrometer 2 is disconnected from the sampling tube 21. The pump quantitatively extracts air from the storage chamber 41, creating a stable negative pressure inside the storage chamber 41 and the dropper 4 connected to it. The pressure difference draws the pre-prepared lactic acid sample solution into the dropper 4. After initial sampling, the pump continues to run briefly to completely transfer any remaining sample solution from the inner wall of the dropper 4 to the storage chamber. Inside the cavity 41, quantitative collection of samples is achieved. Since the bottom height of the storage cavity 41 is consistent with the top height of the guide tube 3, the sample solution in the storage cavity 41 flows smoothly into the inclined guide tube 3 by its own gravity, and flows into the sampling bottle 1 along the inclined direction of the guide tube 3. The end of the guide tube 3 near the sampling bottle 1 extends into the sampling bottle 1, which can ensure that all sample solutions fall accurately into the bottom of the sampling bottle 1, which facilitates the rapid extraction of volatile gases by the subsequent sampling tube 21. After the quantitative sample delivery is completed, the pump stops running, completing the entire sample delivery process.

[0045] Subsequently, the formal testing phase begins. Valve 22 is pre-opened to maintain communication between sampling tube 21 and ion mobility spectrometer 2. Ion mobility spectrometer 2 initiates its gas extraction operation, and the lactic acid sample at the bottom of sampling bottle 1 gradually volatilizes at room temperature. Ion mobility spectrometer 2 continuously extracts the gas formed by the volatilization of the sample in sampling bottle 1 through sampling tube 21, thereby completing the detection and analysis of lactic acid content. During this testing process, outside air can only enter the storage chamber 41 from the bottom of dropper 4. Due to the constraints of the internal pipeline structure of the device, the airflow balance after quantitative sample delivery by the pump, and the obstruction of the volatilization of residual sample on the inner wall of the pipeline, outside air cannot penetrate into the sampling bottle 1. This effectively prevents the volatilized gas in sampling bottle 1 from being diluted by outside air, eliminating external interference factors from the source and ensuring a stable testing process and accurate test results.

[0046] When cleaning and maintenance of the equipment are required after a single batch of testing is completed, first close valve 22 to block the gas path connection between sampling tube 21 and ion mobility spectrometer 2. Then, control the pump to run in reverse to inject a quantitative amount of air into the storage chamber 41. With the help of the airflow purging force, the sample solution remaining on the inner wall of dropper 4 is completely purged and discharged, completing the initial physical cleaning. After the initial cleaning is completed, keep valve 22 open and introduce isopropanol vapor into dropper 4. The isopropanol vapor is driven by the airflow and flows sequentially through dropper 4, storage chamber 41, guide tube 3, sampling bottle 1, sampling tube 21, and the ionization region of ion mobility spectrometer 2. Utilizing the good solubility of lactic acid and its own high volatility, isopropanol performs a comprehensive and deep cleaning of the entire equipment's detection flow path. The cleaned mixed gas is discharged through the original exhaust structure of ion mobility spectrometer 2, thoroughly removing residual samples in the pipeline and avoiding cross-contamination in subsequent tests. After completing the entire self-cleaning process, the equipment can be put into use for the next batch of testing.

[0047] In summary, this invention eliminates the need for repeated disassembly and reassembly of the sampling bottle 1 and manual sample addition during the detection process. Through the coordinated operation of the pump, storage chamber 41, dropper 4, and guide tube 3, it achieves automated quantitative delivery and precise dispensing of lactic acid samples. The entire process eliminates the need for manual disassembly and reassembly of the sampling bottle 1 and manual addition of samples one by one, significantly simplifying the detection operation process, reducing manual intervention, and effectively reducing the intensity of manual operation. At the same time, it can adapt to the continuous detection needs of multiple batches of lactic acid samples with different concentrations, improving the overall efficiency of lactic acid detection in Daqu (a type of Chinese liquor), and is suitable for the actual scenario of batch detection of lactic acid content in Daqu during the production of Baijiu (Chinese liquor).

[0048] Secondly, through the exclusive structural design of the inclined arrangement of the guide tube 3 and the height matching of the storage cavity 41 with the upper end of the guide tube 3, combined with the working mode of quantitative gas extraction and sample delivery by the pump, it can not only ensure that the sample solution falls accurately into the bottom of the sampling bottle 1, which facilitates the rapid and complete extraction of sample volatile gas by the sampling tube 21 and improves the gas extraction efficiency, but also effectively prevent the intrusion of external air into the sampling bottle 1 through the internal airflow constraint and the barrier effect of the residual sample volatilization in the pipeline, completely avoid the dilution of sample volatile gas by external air, eliminate the deviation of detection data caused by external interference factors, and effectively ensure the accuracy, stability and reliability of lactic acid detection results, fully meeting the accuracy requirements of lactic acid quantitative analysis.

[0049] Reference Figure 7 and Figure 8 The guide tube 3 extends into the sampling bottle 1 at one end.

[0050] The guide tube 3 extends into the sampling bottle 1 at one end, completely avoiding the problem of sample solution splashing onto the bottle opening or inner wall of the sampling bottle 1 when flowing out of the guide tube 3. This ensures that the lactic acid sample solution, quantitatively delivered by the pump and guided by the storage chamber 41, falls precisely into the core area at the bottom of the sampling bottle 1, rather than being dispersed and attached to the upper part of the bottle. On the one hand, it conforms to the gas extraction path of the sampling tube 21 of the ion mobility spectrometer 2, allowing the gas generated by sample evaporation to be quickly and completely extracted by the sampling tube 21, avoiding insufficient extraction due to sample evaporation gas remaining on the upper part of the bottle, and ensuring the integrity of the detection signal. On the other hand, it eliminates the waste and cross-contamination risks caused by sample solution remaining at the bottle opening, improves the accuracy of the detection results, and eliminates the need for manual adjustment of the sample drop position, simplifying the operation and solving the technical problems of inaccurate sample placement and incomplete collection of evaporation gas in existing technologies.

[0051] Reference Figure 7 and Figure 8 The lower end of the sampling tube 21 is a flared structure that is set vertically downwards.

[0052] The lower end of the sampling tube 21 adopts a vertically downward flared structure, and the vertical orientation precisely corresponds to the sample placement area at the bottom of the sampling bottle 1. Compared with the conventional straight tube structure, the flared structure can significantly expand the coverage of gas collection, efficiently gather and collect all the gas generated by the volatilization of the lactic acid sample at the bottom of the sampling bottle 1, avoid the volatilized gas from drifting and losing, and improve the strength and stability of the signal received by the ion mobility spectrometer 2.

[0053] Reference Figure 3 and Figure 4 The testing equipment also includes:

[0054] The lifting frame 5 is located below the dropper 4;

[0055] Storage bottle 51, located on the upper part of the lifting frame 5, is used to store isopropanol samples containing dissolved lactic acid.

[0056] The first linear actuator 6 is located on one side of the lifting frame 5 and is used to drive the lifting frame 5 to move in the vertical direction.

[0057] During operation, the storage bottle 51 contains a sample of isopropanol dissolved in lactic acid and is placed on the lifting frame 5 below the dropper 4. The first linear actuator 6 acts as a power source, precisely driving the lifting frame 5 to rise and fall smoothly in the vertical direction, thereby causing the storage bottle 51 to move up and down synchronously, eliminating the need for manual connection between the dropper 4 and the storage bottle 51. When sampling is required, the first linear actuator 6 drives the lifting frame 5 to rise, bringing the storage bottle 51 closer to the dropper 4, completing the precise connection between the dropper 4 and the storage bottle 51. Combined with the working logic of the pump drawing air to create negative pressure in the storage chamber 41, the sample is automatically and quantitatively extracted. After sampling, the first linear actuator 6 drives the lifting frame 5 to fall, causing the storage bottle 51 to quickly separate from the dropper 4. The entire process requires no manual contact with the sampling bottle 1, and no manual loading, unloading, or adding of samples, completely eliminating the tedious steps of repeatedly disassembling and assembling the sampling bottle 1 in existing technologies. This achieves automated sampling, which not only greatly simplifies the operation process and improves detection efficiency, but also avoids sample contamination and concentration deviation problems caused by manual operation.

[0058] Reference Figure 3 , Figure 7 and Figure 8 A cleaning chamber 52 is also provided on the upper part of the lifting frame 5. A drain outlet 521 for discharging sewage is provided at the bottom of the cleaning chamber 52. A switch valve 522 is provided on the drain outlet 521.

[0059] A valve 22 that can be opened and closed is provided between the sampling tube 21 and the ion mobility spectrometer 2. When the device needs cleaning and maintenance after testing, the second linear actuator 7 drives the lifting frame 5 to move horizontally again, precisely moving the cleaning chamber 52 to the position directly below the dropper 4. The first linear actuator 6 drives the lifting frame 5 to rise, so that the lower end of the dropper 4 passes through the through hole of the rubber membrane 53 at the upper end of the cleaning chamber 52 and is inserted into the cleaning chamber 52. At this time, the valve 22 between the sampling tube 21 and the ion mobility spectrometer 2 is closed, blocking the connection between the two. The pump body runs in reverse to inflate the storage chamber 41, and the airflow completely blows away the sample droplets remaining on the inner wall of the dropper 4. The discharged waste liquid falls into the cleaning chamber 52 and is discharged outward through the drain port 521 at the bottom of the cleaning chamber 52. After the discharge operation is completed, the switch valve 522 of the pump body and the drain port 521 is closed simultaneously. Then, the valve body 22 between the sampling tube 21 and the ion mobility spectrometer 2 is reopened, and isopropanol vapor is introduced. The isopropanol vapor flows sequentially through the dropper 4, the storage chamber 41, the guide tube 3, the sampling bottle 1, the sampling tube 21, and the ionization zone, and is finally discharged through the original exhaust port of the ion mobility spectrometer 2. Utilizing the solubility of lactic acid in isopropanol and its own high volatility, the entire detection flow path is thoroughly cleaned, preparing for the next detection. After cleaning, the isopropanol evaporates on its own due to its high volatility and will not remain in the detection equipment.

[0060] By utilizing the solubility and high volatility of isopropanol in lactic acid, residual samples are thoroughly removed. The combination of cleaning chamber 52 and drain valve enables centralized discharge of residual waste liquid, preventing waste liquid from contaminating the inside of the equipment or sampling bottle 1, eliminating cross-contamination, and eliminating the need for manual disassembly of the equipment for cleaning, further simplifying the maintenance process, adapting to the needs of continuous batch testing, improving the self-cleaning function of the equipment, and solving the problems of inconvenient cleaning and easy cross-contamination in existing technologies.

[0061] Reference Figure 5 , Figure 7 and Figure 8 The cleaning chamber 52 has an inlet 523 on its side wall for discharging isopropanol vapor.

[0062] After the residual liquid in the dropper 4 is cleaned by the airflow blown out in the opposite direction by the pump, the discharge port 523 is opened, and the isopropanol vapor is discharged into the cleaning chamber 52 through the discharge port 523, and flows through the dropper 4, storage chamber 41, guide tube 3, sampling bottle 1, sampling tube 21 and ionization zone in sequence to complete the cleaning work.

[0063] Reference Figure 5 , Figure 7 and Figure 8 Both the storage bottle 51 and the cleaning chamber 52 have openings at their tops. A rubber membrane 53 is provided at the openings of both the storage bottle 51 and the cleaning chamber 52. A through hole for the dropper 4 to pass through is provided at the center of the rubber membrane 53. The diameter of the through hole is smaller than the diameter of the dropper 4.

[0064] The rubber membrane 53 structure achieves sealing protection while adapting to automated docking requirements. The rubber membrane 53 at the upper opening of the storage bottle 51 and the cleaning chamber 52 serves as a seal. The diameter of the central through hole of the rubber membrane 53 is smaller than the diameter of the dropper 4. Utilizing the elastic properties of the rubber itself, a flexible seal is achieved when the dropper 4 passes through: when the first linear actuator 6 drives the lifting frame 5 to rise, and the dropper 4 passes through the through hole of the rubber membrane 53, the rubber membrane 53 is compressed and elastically expands, tightly wrapping the outer wall of the dropper 4 without any gaps; when the dropper 4 is pulled out, the rubber membrane 53 elastically retracts, the through hole automatically closes, and the micro-seal state is restored. For storage bottle 51, this structure effectively slows down the evaporation rate of isopropanol solvent, preventing deviations in sample concentration caused by isopropanol evaporation and ensuring stable sample concentration for testing. It also prevents external dust and impurities from entering storage bottle 51 and contaminating the sample, ensuring sample purity and improving detection accuracy. For cleaning chamber 52, the rubber membrane 53 prevents isopropanol vapor leakage and waste liquid splashing during cleaning, while also preventing external impurities from entering cleaning chamber 52 and affecting the cleaning process. This ensures sample stability and cleanliness without affecting the automated connection and disconnection of dropper 4 with storage bottle 51 and cleaning chamber 52. No manual sealing is required throughout the process, adapting to the overall automated detection and cleaning logic. This solves the technical problems of easy sample evaporation and inconvenient sealing in existing technologies, further optimizing the practicality and detection stability of the equipment.

[0065] Reference Figure 7 and Figure 8 A reinforcing ring 531 is provided at the lower part of the rubber membrane 53 along the axial direction of the through hole.

[0066] A reinforcing ring 531 is installed at the lower part of the through hole to increase the strength of the rubber membrane 53 at the through hole. When the dropper 4 is inserted into the storage bottle 51 or the cleaning chamber 52, it first passes through the through hole in the rubber membrane 53. The dropper 4 squeezes the through hole as it passes through, causing the through hole to expand. The reinforcing ring 531 at the lower part of the through hole can improve the tensile strength of the through hole and prevent the thin rubber membrane 53 at the through hole from being damaged after long-term use. In addition, when the dropper 4 is withdrawn from the storage bottle 51 or the cleaning chamber 52, the inner ring of the reinforcing ring 531 can make close contact with and slide against the outer peripheral wall of the dropper 4. During the withdrawal of the dropper 4, the reinforcing ring 531 scrapes off the sample or isopropanol vapor residue on the outer peripheral wall of the dropper 4, preventing the residue on the outer wall of the dropper 4 from contaminating the samples stored in other storage bottles 51 during subsequent sampling tests.

[0067] Reference Figure 4 The lifting frame 5 is provided with a limiting ring 54 for limiting the position of the storage bottle 51.

[0068] By setting a limiting ring 54 on the upper part of the lifting frame 5, the limiting ring 54 can limit the storage bottle 51, preventing the storage bottle 51 from shaking during the synchronous movement of the lifting frame 5. At the same time, by setting the limiting ring 54, the position of the through hole on the rubber membrane 53 can be automatically positioned, so that when the second linear actuator 7 drives the lifting frame 5 to move in the horizontal direction, the dropper 4 can be automatically positioned with the through hole on the rubber membrane 53.

[0069] Reference Figure 1 and Figure 2 The storage bottles 51 are arranged in multiple horizontally, and a second linear driver 7 is provided at the lower part of the lifting frame 5 and the first linear driver 6 to drive them to move synchronously in the horizontal direction.

[0070] Different storage bottles 51 contain samples of different concentrations. By setting a second linear actuator 7, the lifting frame 5 can move the different storage bottles 51 directly below the dropper 4, making it convenient for the dropper 4 to take samples.

[0071] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture), comprising a sampling bottle (1), a sampling tube (21), and an ion mobility spectrometer (2). Its features are, Also includes: A valve body (22) is disposed between the ion mobility spectrometer (2) and the sampling tube (21); The guide tube (3) is inclinedly disposed on the side wall of the sampling bottle (1), and the end of the guide tube (3) near the sampling tube (21) is lower than the end away from the sampling tube (21); A dropper (4) is vertically arranged on one side of the guide tube (3) and connected to the upper end of the guide tube (3). There is a storage cavity (41) between the dropper (4) and the guide tube (3) that connects the two. The bottom height of the storage cavity (41) is the same as the upper end height of the guide tube (3). A pump body is disposed at the upper part of the storage chamber (41) for extracting air from the storage chamber (41) or injecting air into the storage chamber (41).

2. The self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture for Chinese liquor) according to claim 1, characterized in that, The guide tube (3) extends into the sampling bottle (1) at one end.

3. The self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture for Chinese liquor) according to claim 1, characterized in that, The lower end of the sampling tube (21) is a flared structure that is set vertically downwards.

4. The self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture for Chinese liquor) according to claim 1, characterized in that, The testing equipment also includes: The lifting frame (5) is located below the dropper (4); Storage bottle (51), located on the upper part of the lifting frame (5), is used to store isopropanol samples containing dissolved lactic acid; The first linear actuator (6) is located on one side of the lifting frame (5) and is used to drive the lifting frame (5) to move in the vertical direction.

5. A self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture for Chinese liquor) according to claim 4, characterized in that, A cleaning chamber (52) is also provided on the upper part of the lifting frame (5). A drain port (521) for discharging sewage is provided at the bottom of the cleaning chamber (52). A switch valve (522) is provided on the drain port (521).

6. The self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture for Chinese liquor) according to claim 5, characterized in that, The cleaning chamber (52) has an inlet (523) on its side wall for discharging isopropanol vapor.

7. A self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture) according to claim 6, characterized in that, Both the storage bottle (51) and the cleaning chamber (52) have openings at their tops. A rubber membrane (53) is provided at the opening of both the storage bottle (51) and the cleaning chamber (52). A through hole for the dropper (4) to pass through is provided at the center of the rubber membrane (53). The diameter of the through hole is smaller than the diameter of the dropper (4).

8. A self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture) according to claim 7, characterized in that, A reinforcing ring (531) is provided at the lower part of the rubber membrane (53) along the axial direction of the through hole.

9. A self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture for Chinese liquor) according to claim 4, characterized in that, The lifting frame (5) is provided with a limiting ring (54) for limiting the storage bottle (51).

10. A self-cleaning detection device for detecting lactic acid in baijiu daqu (a type of starter culture) according to claim 4, characterized in that, The storage bottles (51) are arranged in multiple horizontally, and a second linear driver (7) is provided at the lower part of the lifting frame (5) and the first linear driver (6) for driving the two to move synchronously in the horizontal direction.

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