A method for the pretreatment of routine chemical analysis of tobacco

Abstract

This invention relates to a pretreatment method for conventional chemical analysis of tobacco, comprising the following specific steps: S1, quantitative feeding: conveying and removing caps, adding powder, adding liquid, and resetting; S2, oscillating extraction; S3, filtration separation: needle assembly, secondary cap removal, liquid extraction, secondary capping, and filtration; S4, removal and resetting; wherein quantitative feeding is achieved through the cooperation of separate rotating gripper assemblies and clamping assemblies, which not only avoid mutual interference but also ensure accuracy through coordinated positioning; during filtration separation, the synchronously staggered rotating gripper assemblies and liquid extraction assemblies effectively avoid interference between steps, reduce the use of conveying mechanisms, and shorten the operation distance. This invention, without requiring excessive conveying mechanisms, makes each processing step simple and clear through the corresponding correlation and positioning between steps, resulting in more compact connections between adjacent steps and facilitating subsequent rapid cleaning.

Description

Technical Field

[0001] This invention relates to the field of tobacco chemical analysis technology, specifically to a pretreatment method for conventional tobacco chemical analysis. Background Technology

[0002] Analysis of tobacco aroma compounds requires prior extraction. Since most aroma compounds are present in extremely low concentrations, each step of the extraction process is crucial and directly affects the accuracy and completeness of the qualitative and quantitative analysis of the analytes in instrumental chemical analysis.

[0003] Tobacco extraction is a solid-liquid extraction process. The key lies in preparing the sample solution, which requires weighing a specific amount of tobacco powder, adding the extract, and then filtering the extract after shaking to allow for chemical analysis. Current analysis mainly relies on manual sampling and extraction, which is labor-intensive, inefficient, and prone to errors. Therefore, intelligent machinery is gradually being put into use.

[0004] Currently, a fully automatic powder quantitative sampling and extraction device and its preparation method, such as the one described in patent number CN120594862A, is set up with processing zones from top to bottom. In order to ensure the connection between the top and bottom, each processing zone needs to be equipped with a corresponding conveying mechanism for the transfer of instruments. This results in a complex equipment structure, with each processing step being independent and cumbersome, and the connection between adjacent steps being loose. Although it is suitable for industrial-scale large-scale powder sample processing, it is overkill for small-batch analysis pretreatment in the laboratory. Furthermore, because it sets up samplers, liquid extractors, and filters in a serpentine series for calibration, it not only increases the complexity of the equipment, but also requires the equipment to be reset after each operation during the later cleaning process, so as to facilitate the disassembly and cleaning of consumables or instruments to be cleaned, which is very troublesome.

[0005] Therefore, the research objective of this invention is to design a tobacco chemical conventional analysis pretreatment method that, without requiring excessive conveying mechanisms, achieves a concise and clear process for each processing step through corresponding correlation and positioning between steps, resulting in a more compact connection between adjacent steps and facilitating subsequent rapid cleaning. Summary of the Invention

[0006] In view of the technical problems existing in the prior art, the present invention provides a pretreatment method for conventional analysis of tobacco chemistry, which can effectively solve the technical problems existing in the prior art.

[0007] The technical solution of this invention is: A pretreatment method for routine chemical analysis of tobacco includes the following specific steps: S0, Equipment preparation: Samplers, square bottles, liquid storage bottles, and pipettes are prepared manually and mechanically and placed in their corresponding positions on the continuous flow analysis pretreatment equipment. The liquid storage bottle is fixed with a cross-shaped soft rubber stopper and is connected to a filter. An appropriate amount of powder is placed in the sampler. S1, quantitative feed: S11, Transfer and remove cap: The cap of the square bottle is picked up by the rotating gripper assembly and moved above the weighing balance. The bottle body of the square bottle is held and fixed by the clamping assembly. The rotating gripper assembly rotates and drives the cap to unscrew the bottle body and place it in the corresponding position. S12, Powder addition: The rotating gripper assembly grips the screw feeder of the sampler and moves it directly above the capped square bottle. The clamping assembly moves upward and clamps the hopper that fixes the sampler. The rotating gripper assembly drives the screw feeder to rotate upward and add the powder in the sampler to the capped square bottle until the weight reaches the set value of the weighing balance. S13, Liquid addition: The quantitative liquid addition component is moved to its inlet facing the capped square bottle and the liquid is added quantitatively. S14, Reset: The square bottle is reset after the cap is put on by cooperating with the rotating jaw assembly and the clamping assembly; S2, Shaking Extraction: The liquid in the container is shaken and mixed by starting the shaker for extraction; S3, filtration separation S31, Needle assembly: The suction nozzle of the suction assembly moves and is inserted into the pipette through an interference fit; S32, Secondary cap removal: While the rotating gripper assembly moves down, the liquid extraction assembly simultaneously drives the inserted pipette to move up and offset to create space. With the help of the second placement plate on the shaker, the bottle is circumferentially fixed. The rotating gripper assembly clamps and rotates the bottle cap of the bottle to remove the cap. The rotating gripper assembly moves and offsets the bottle cap and bottle body so that the pipette is directly facing the bottle body and bottle mouth. S33, liquid extraction: the liquid extraction component moves down to insert the pipette into the bottle body to extract the supernatant. At the same time as the liquid extraction component moves down, the rotating jaw component simultaneously moves the top cover up to create a misalignment. S34, Secondary capping: The rotating gripper assembly moves to face the bottle and then rotates downward to reset the bottle cap; S35, Filtration: The liquid extraction assembly moves the pipette after extraction to the top of the storage bottle and inserts it into the filter at the bottle mouth to release the liquid. The liquid flows into the storage bottle after being filtered. S4, Dismantle and reset: Move the liquid extraction assembly and bring the pipette with the filter inserted at the end to the collection box, push the pipette and filter out of the liquid extraction assembly, and then reset; S5 waste liquid removal S51, Secondary assembly of needle: The inlet of the drainage assembly moves and the pipette is inserted through an interference fit; S52, three-stage cap removal: while the rotating gripper assembly moves down, the drain assembly simultaneously drives the inserted pipette to move up and offset to create space. In conjunction with the second placement plate on the shaker, the bottle is circumferentially fixed. The bottle cap of the bottle is removed by the rotating gripper assembly by gripping and rotating it. The rotating gripper assembly moves and offsets the bottle cap and bottle body so that the pipette is directly facing the bottle body and bottle mouth. S53, draining liquid, the draining component moves down to drive the pipette into the bottle body to extract waste liquid, and at the same time the draining component moves down, the rotating gripper component simultaneously drives the top cover to move up and misalign to make room; S54, triple capping: The rotating gripper assembly moves to face the bottle and then rotates downward to reset the bottle cap; S55, move the drain assembly to the collection box, push the pipette out of the drain assembly and reset it.

[0008] The above pretreatment method is implemented based on a continuous flow analysis pretreatment device. The continuous flow analysis pretreatment device includes a housing, and a corresponding storage area is provided inside the housing. The storage area is horizontally and side by side equipped with a first storage plate for placing samplers, a second storage plate for placing square bottles, a third storage plate for placing round bottles, a storage rack for placing clean pipettes, and a collection box for placing waste pipettes. The shaker, with the second plate fixedly mounted on the shaker, is used to shake the powder in the bottle. The multifunctional robotic arm includes a rotating gripper assembly and a liquid extraction assembly that are synchronously and staggered in position, as well as a quantitative liquid addition assembly that is fixedly installed with the rotating gripper assembly. The multifunctional robotic arm is driven to move forward, backward, left, and right through a corresponding two-dimensional mechanism. The weighing and feeding mechanism includes a weighing balance and a clamping assembly. The clamping assembly is longitudinally movable and installed on the side of the weighing balance. The clamping assembly can clamp and fix the body of the square bottle and cooperate with the rotating jaw assembly to unscrew the bottle cap. It can also be used to clamp and fix the hopper of the sampler and cooperate with the rotating jaw assembly to pull up and rotate the spiral feeder of the sampler for adding powder.

[0009] The rotating gripper assembly and the liquid extraction assembly are synchronously driven vertically and vertically through corresponding misalignment drive components. The misalignment drive component includes a left toothed plate and a right toothed plate that are longitudinally opposite to each other and vertically and misaligned and mounted on a support base. Corresponding racks are evenly distributed on the opposite sides of the left toothed plate and the right toothed plate. The left toothed plate and the right toothed plate are both meshed with the same drive gear. The drive gear is fixedly connected to the output shaft end of a rotary motor mounted on the support base. When the top of the left toothed plate meshes with the drive gear, the bottom of the right toothed plate meshes with the drive gear. The support base is mounted on the two-dimensional mechanism and is driven to move by the two-dimensional mechanism.

[0010] The support base is also fixedly provided with corresponding linear guide rails on the outer side of the left and right toothed plates. The left and right toothed plates are respectively fixedly provided with sliders connected to the corresponding linear guide rails. The upper and lower ends of the side of the support base are provided with corresponding first inductive switches. The left or right toothed plate on the same side as the first inductive switch is fixedly installed with a sensing element, which is located between the two first inductive switches.

[0011] The liquid extraction assembly is fixedly installed on the right toothed plate. The liquid extraction assembly includes a liquid extraction nozzle connected to an air pump and a connector sleeved on the outside of the liquid extraction nozzle, which is driven to move up and down by a corresponding drive mechanism. Before extraction, the liquid extraction nozzle is inserted into the pipette with an interference fit. After extraction, the connector is driven to move down by the drive mechanism to push the pipette out of the liquid extraction nozzle.

[0012] A drain assembly is installed on the right toothed plate, which is offset from the liquid suction assembly. The drain assembly includes a drain nozzle connected to the drain pump through a corresponding drain pipe. The other side of the connector is sleeved on the outside of the drain nozzle. Before draining, the drain nozzle is inserted into the pipette with an interference fit. After draining, the connector is driven to move down by the drive mechanism to push the pipette out of the drain nozzle.

[0013] The rotating gripper assembly includes a power body and a set of rotating grippers mounted on the drive end of the power body via a corresponding connecting plate. The set of rotating grippers is driven by the power body to move synchronously relative to each other and rotate synchronously.

[0014] The clamping assembly includes a set of clamping jaws that move synchronously relative to each other driven by a power mechanism. The clamping jaws have rectangular grooves on opposite sides that are adapted to the body of the square bottle, and an arc-shaped groove adapted to the hopper of the sampler is recessed in the middle of the rectangular groove. The power mechanism is driven to move up and down by a corresponding linear motor module. The linear motor module includes a slide that moves up and down along a travel track. The slide is screwed onto a lead screw fixed to the output shaft of the drive motor. Corresponding second inductive switches are provided on the upper and lower sides of the travel track.

[0015] Advantages of this invention: 1) Through structural optimization and improvement, this invention makes the overall structure simpler and clearer, with more compact connections between adjacent processing steps, shortening the pre-processing time and facilitating subsequent rapid cleaning, without the need for excessive conveying mechanisms to bridge the gap.

[0016] 2) Based on the rotary gripper assembly and clamping assembly for conveying and decapping bottles, as well as the sampler for conveying and discharging materials, this invention adds a liquid extraction assembly for extracting supernatant without interference. This achieves multiple functions. Through the intervention of the staggered drive assembly, the liquid extraction assembly and the rotary gripper assembly move synchronously up and down in a staggered manner, effectively avoiding mutual interference between actions. Furthermore, no additional positioning mechanism is required. The alignment of the liquid extraction assembly with the bottle body and bottle mouth can be ensured simply by rotating the bottle cap off the rotary gripper assembly. This makes the structure simple and the steps compact, thereby improving processing efficiency.

[0017] 3) This invention achieves synchronous up-and-down misalignment of the rotating gripper assembly and the liquid extraction assembly by intervening in the misalignment drive component. The rotation and meshing of gears drive the relative movement of two toothed plates, so that the rotating gripper assembly and the liquid extraction assembly can move up and down synchronously. The misalignment cleverly creates clearance, effectively avoiding interference and ensuring the continuous realization of the dual functions of gripping and capping and liquid extraction and filtration. Moreover, the liquid extraction process can be carried out in the square bottle placement area without the need for a separate operating space, thereby shortening the operation time and simplifying the process steps.

[0018] 4) In this invention, the quantitative liquid dispensing component is directly and fixedly connected to the rotating gripper component in parallel and moves up and down with the rotating gripper component. It is driven to move forward, backward, left and right through the same two-dimensional mechanism. There is no need for an additional rotating drive mechanism to drive the quantitative liquid dispensing component. The quantitative liquid dispensing component and the square bottle can be aligned and dispensed by driving through the two-dimensional mechanism after the cap is screwed on. This can also effectively avoid the interference problem between the quantitative liquid dispensing component and the rotating gripper component, further improving the practical effect of this invention.

[0019] 5) Through structural optimization and improvement, this invention separates the rotating gripper assembly and the clamping assembly, eliminating concerns about interference between clamping fixation and clamping rotation. This also eliminates the need for excessive drive mechanisms to achieve misalignment between the rotating gripper assembly and the clamping assembly, simplifying the robot arm structure and making operation more convenient, thereby shortening the weighing and loading process. Furthermore, by placing the clamping assembly on the side of the weighing balance, in conjunction with the rotating gripper assembly for opening the bottle cap, the bottle can be positioned on the weighing balance without the need for other positioning mechanisms or modifications to the weighing balance. This improves placement accuracy, not only enhancing weighing precision and reducing errors caused by bottle placement deviations, but also facilitating smooth cap resetting. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the process of the present invention.

[0021] Figure 2 This is a schematic diagram of the pretreatment equipment for continuous flow analysis in this invention.

[0022] Figure 3 for Figure 2 A schematic diagram of the structure after removing the casing.

[0023] Figure 4 for Figure 3 A schematic diagram of the structure of the multifunctional robotic arm.

[0024] Figure 5 for Figure 3 A schematic diagram showing the state of a multi-functional robotic arm installing a pipette for liquid transfer.

[0025] Figure 6 for Figure 3 A schematic diagram of the weighing and feeding mechanism.

[0026] Figure 7 for Figure 3 A schematic diagram showing the state of the weighing and feeding mechanism of the weighing balance.

[0027] In the attached diagram: 1. Housing; 2. Multifunctional robotic arm; 201. Rotary gripper assembly; 2011. Power unit; 2012. Rotary gripper; 202. Liquid extraction assembly; 2021. Air pump; 2022. Liquid extraction nozzle; 2023. Connector; 203. Quantitative liquid addition assembly; 2031. Volumetric pump; 2032. Injection head; 204. Misalignment drive assembly; 2041. Left toothed plate; 2042. Right toothed plate; 2043. Drive gear; 2044. Support base; 2045. Rotary motor; 2046. Linear guide rail; 2047. Slider; 2048. First inductive switch; 2049. Sensor; 205. Liquid drainage assembly; 2051. Liquid drainage nozzle; 3. Weighing and feeding mechanism; 4. Weighing head. 301, clamping assembly 302, clamping jaws 3021, power mechanism 3022, linear motor module 3023, travel rail 30231, slide block 30232, drive motor 30233, second inductive switch 30234, bottle cap holder 303, groove 3031, scanner 304, sampler 4, first shelf 5, rectangular groove 5021, arc groove 5022, square bottle 6, second shelf 7, liquid storage round bottle 8, third shelf 9, pipette 10, shelf 11, collection box 12, oscillator 13, two-dimensional mechanism 14, X-axis linear slide rail 1401, Y-axis linear slide rail 1402, filter 15. Detailed Implementation

[0028] To facilitate understanding by those skilled in the art, the structure of the present invention will now be described in further detail with reference to the accompanying drawings: Example 1 refer to Figure 1-2 A pretreatment method for routine chemical analysis of tobacco includes the following specific steps: S1, quantitative feed: S11, transfer and remove cap: the cap of the square bottle 6 is picked up by the rotating gripper assembly 201 and moved above the weighing balance 301. The bottle body of the square bottle 6 is held and fixed by the clamping assembly 302. The rotating gripper assembly 201 rotates and drives the cap to unscrew the bottle body and place it in the corresponding position. The bottle body is placed on the weighing balance 301 by the clamping assembly 302. S12, Powder addition: The rotating gripper assembly 201 grips the screw feeder of the sampler 4 and moves it directly above the capped square bottle 6. The clamping assembly 302 moves upward and clamps the hopper that fixes the sampler 4. The rotating gripper assembly 201 drives the screw feeder to rotate upward and add the powder in the sampler 4 to the capped square bottle 6 until the weight reaches the set value of the weighing balance 301. S13, Liquid addition: The quantitative liquid addition component 203 is moved to its inlet facing the capped square bottle 6 and the liquid is added quantitatively. S14, Reset: The square bottle 6 is reset after the cap is put on by the cooperation of the rotating jaw assembly 201 and the clamping assembly 302; S2, Shaking Extraction: The liquid in the container 6 is shaken and mixed by starting the shaker 13; S3, filtration separation S31, Needle assembly: The suction nozzle of the suction assembly 202 moves and is inserted into the pipette 10 through an interference fit; S32, Secondary cap removal: While the rotating gripper assembly 201 moves downward, the liquid extraction assembly 202 simultaneously drives the inserted pipette 10 to move upward and offset to create space. With the help of the second placement plate on the shaker 13, the bottle 6 is circumferentially fixed. The rotating gripper assembly 201 grips and rotates the bottle cap of the bottle 6 to remove the cap. The rotating gripper assembly 201 moves and offsets the bottle cap and bottle body so that the pipette 10 is directly facing the bottle body and bottle mouth. S33, liquid extraction, the liquid extraction component 202 moves down to drive the pipette 10 to be inserted into the bottle body to extract the supernatant. At the same time as the liquid extraction component 202 moves down, the rotating jaw component 201 simultaneously drives the upper cover to move up and misalign to create a clearance. S34, Secondary capping: The rotating gripper assembly 201 moves to face the bottle and then rotates downward to reset the bottle cap; S35, Filtration: The liquid extraction assembly 202 moves the pipette 10 after extraction to the top of the liquid storage bottle 8 and inserts it into the filter 15 at the bottle mouth of the liquid storage bottle 8 to release the liquid. After being filtered by the filter 15, the liquid flows into the liquid storage bottle 8. S4, Dismantle and reset: Move the liquid extraction assembly 202 and drive the pipette 10 with the filter 15 inserted at the end to the collection box 12, push the pipette 10 and the filter 15 out of the liquid extraction assembly 202, and then reset.

[0029] The pretreatment method further includes step S5, waste liquid removal, which includes... S51, Secondary assembly of needle: The inlet of the drainage assembly 205 moves and is inserted into the pipette 10 through an interference fit; S52, three-stage cap removal: While the rotating gripper assembly 201 moves down, the drain assembly 205 simultaneously drives the inserted pipette 10 to move up and offset to create space. In conjunction with the second placement plate on the shaker 13, the bottle 6 is circumferentially fixed. The rotating gripper assembly 201 grips and rotates the bottle cap of the bottle 6 to remove the cap. The rotating gripper assembly 201 moves and offsets the bottle cap and bottle body so that the pipette 10 is directly facing the bottle body and bottle mouth. S53, draining liquid, the draining component 205 moves down to drive the pipette 10 to be inserted into the bottle body to extract waste liquid, and at the same time the draining component 205 moves down, the rotating gripper component 201 simultaneously drives the upper cover to move up and misalign to make room. S54, Three-stage capping: The rotating gripper assembly 201 moves to face the bottle and then rotates downward to reset the bottle cap; S55, move the drain assembly 205 onto the collection box 12, push the pipette 10 out of the suction assembly 202 and then reset it.

[0030] Before quantitative feeding in step S1, there is also equipment preparation. The sampler 4, square bottle 6, liquid storage round bottle 8, and pipette 10 are prepared manually and mechanically and placed in the corresponding positions of the continuous flow analysis pretreatment equipment. The liquid storage round bottle 8 is fixedly equipped with a cross soft rubber stopper and is connected to a filter 15. An appropriate amount of powder is put into the sampler 4.

[0031] Example 2 refer to Figure 2-7 The difference between this embodiment and Embodiment 1 is that the above pretreatment method is based on a continuous flow analysis pretreatment device. The continuous flow analysis pretreatment device includes a housing 1. The housing 1 is provided with a corresponding storage area. The storage area is provided with a first storage plate 5 for placing a sampler 4, a second storage plate 7 for placing a square bottle 6, a third storage plate 9 for placing a liquid storage round bottle 8, a storage rack 11 for placing a clean pipette 10, and a collection box 12 for placing a waste pipette 10. The second plate 7 is fixedly mounted on the shaker 13 and is used to shake the powder in the bottle 6. The multi-functional robotic arm 2 includes a rotating gripper assembly 201 and a liquid extraction assembly 202 that are synchronously and staggered in position, and a quantitative liquid addition assembly 203 that is fixedly installed with the rotating gripper assembly 201. The multi-functional robotic arm 2 is driven to move forward, backward, left, and right through a corresponding two-dimensional mechanism 14. The weighing and feeding mechanism 3 includes a weighing balance 301 and a clamping assembly 302. The clamping assembly 302 is longitudinally movable and installed on the side of the weighing balance 301. The clamping assembly 302 can clamp and fix the body of the square bottle 6 and cooperate with the rotating jaw assembly 201 to unscrew the bottle cap. It can also be used to clamp and fix the hopper of the sampler 4 and cooperate with the rotating jaw assembly 201 to pull up and rotate the spiral feeder of the sampler 4 for powder addition.

[0032] Through structural optimization and improvement, this invention achieves a simpler and clearer overall structure without the need for excessive conveying mechanisms. By linking and positioning the mechanisms, the overall structure becomes more compact and the connection between adjacent processing steps is more efficient, reducing pretreatment time. Furthermore, the sampler 4, square bottle 6, liquid storage round bottle 8, and pipette 10 are placed side by side in a horizontal arrangement. All processes can be completed by a single two-dimensional mechanism 14 driving a robotic arm, eliminating the need for multiple conveying mechanisms. This simplifies the equipment structure, making it more compact and suitable for laboratory use. Operators can easily pick up and put down each instrument without any restrictions, facilitating cleaning and handling.

[0033] The rotating gripper assembly 201 and the liquid extraction assembly 202 are synchronously driven vertically and vertically through corresponding misalignment drive assemblies 204. The misalignment drive assembly 204 includes a left toothed plate 2041 and a right toothed plate 2042 that are longitudinally opposite to each other and vertically and misaligned and mounted on a support base 2044. Corresponding racks are evenly distributed on the opposite sides of the left toothed plate 2041 and the right toothed plate 2042. The left toothed plate 2041 and the right toothed plate 2042 are both meshed with the same drive gear 2043. The drive gear 2043 is fixedly connected to the output shaft end of a rotary motor 2045 mounted on the support base 2044. When the top of the left toothed plate 2041 meshes with the drive gear 2043, the bottom of the right toothed plate 2042 meshes with the drive gear 2043.

[0034] This invention, based on the rotary gripper assembly 201 and clamping assembly 302 for conveying and capping the opposite bottle 6, and conveying and discharging the sampler 4, adds a liquid extraction assembly 202 for supernatant extraction without interference, achieving multi-functionality. Through the intervention of the misalignment drive assembly 204, the liquid extraction assembly 202 and the rotary gripper assembly 201 move synchronously up and down in a misaligned manner, effectively avoiding mutual interference between actions. Moreover, no additional positioning mechanism is required. The alignment of the liquid extraction assembly 202 with the bottle body and mouth is ensured by the rotary gripper assembly 201 twisting and misaligning the bottle cap, making the structure simple and the steps compact, thereby improving processing efficiency.

[0035] This invention achieves synchronous up-and-down misalignment of the rotating gripper assembly 201 and the liquid extraction assembly 202 through the intervention of the misalignment drive component 204. The rotational meshing of the gear 2043 drives the relative movement of the two toothed plates, so that the rotating gripper assembly 201 and the liquid extraction assembly 202 can synchronously achieve up-and-down movements. The misalignment cleverly creates clearance, effectively avoiding interference and ensuring the continuous realization of the dual functions of gripping the cap and extracting and filtering liquid.

[0036] A corresponding linear guide rail 2046 is fixedly installed on the support base 2044 on the outer side of the left toothed plate 2041 and the right toothed plate 2042. A slider 2047 connected to the corresponding linear guide rail 2046 is fixedly installed on the left toothed plate 2041 and the right toothed plate 2042 respectively. A corresponding first inductive switch 2048 is provided at both the upper and lower ends of the side of the support base 2044. A sensing element 2049 is fixedly installed on the left toothed plate 2041 or the right toothed plate 2042 on the same side as the first inductive switch 2048. The sensing element 2049 is disposed between the two first inductive switches 2048.

[0037] The present invention uses a linear guide rail 2046 and a slider 2047 to move and connect the toothed plate and the support base 2044, so as to ensure the stable driving of the misalignment drive assembly 204 to the liquid extraction assembly 202 and the rotating gripper assembly 201; and a first inductive switch 2048 is set between the side of any toothed plate and the support base 2044. The sensor 2049 on the toothed plate touches different first inductive switches 2048 as the toothed plate moves, thereby driving the rotary motor 2045 to rotate in the opposite direction, thus ensuring the operation of the misalignment drive assembly 204.

[0038] The liquid extraction assembly 202 is fixedly installed on the right toothed plate 2042. The liquid extraction assembly 202 includes a liquid extraction nozzle 2022 connected to an air pump 2021 and a connector 2023 that is driven to move up and down on the outside of the liquid extraction nozzle 2022 by a corresponding driving mechanism. Before extraction, the liquid extraction nozzle 2022 is inserted into the pipette 10 with an interference fit. After extraction, the connector 2023 is driven down by the driving mechanism to push the pipette 10 out of the liquid extraction nozzle 2022.

[0039] A drain assembly 205 is installed on the right toothed plate 2042, which is offset from the liquid suction assembly 202. The drain assembly 205 includes a drain nozzle 2051 connected to the drain pump through a corresponding drain pipe. The other side of the connector 2023 is sleeved on the outside of the drain nozzle 2051. Before draining, the drain nozzle 2051 is inserted into the pipette 10 with an interference fit. After draining, the connector 2023 is driven down by the drive mechanism to push the pipette 10 out of the drain nozzle 2051.

[0040] This invention adds a drainage component 205 to the left and right sides of the existing drainage function to further enhance the drainage function. It can effectively drain the waste liquid in the square bottle 6 without the intervention of a corresponding tilting mechanism. Furthermore, the same connector 2023 is movably sleeved on the outside of the suction nozzle 2022 and the drainage nozzle 2051. Through the intervention of the connector 2023, the pipette 10 inserted on the outside of the suction nozzle 2022 and / or the drainage nozzle 2051 can be pushed out and detached from the suction nozzle 2022 and / or the drainage nozzle 2051 to facilitate the automatic loading and unloading of the pipette 10.

[0041] The two-dimensional mechanism 14 includes two parallel X-axis linear slide rails 1401 fixedly connected by support columns. A vertically arranged Y-axis slide rail 1402 is slidably connected to the two X-axis slide rails 1401. The support base 2044 is movably mounted on the Y-axis slide rail 1402.

[0042] The rotating gripper assembly 201 includes a power body 2011 and a set of rotating grippers 2012 mounted on the driving end of the power body 2011 via a corresponding connecting plate 2013. The set of rotating grippers 2012 are driven by the power body 2011 to move and rotate synchronously relative to each other. The clamping assembly 302 includes a set of clamping grippers 3021 driven by a power mechanism 3022 to move synchronously relative to each other. The power body 2011 is commercially available and can drive the rotating grippers 2012 to open and close for clamping, and can also drive the two rotating grippers 2012 to rotate synchronously for capping.

[0043] This invention, through structural optimization and improvement, separates the rotating gripper assembly 201 and the clamping assembly 302, eliminating concerns about interference between clamping fixation and clamping rotation. This also eliminates the need for excessive drive mechanisms to achieve misalignment between the rotating gripper assembly 201 and the clamping assembly 302, simplifying the robot arm structure and making operation more convenient, thereby shortening the weighing and loading process. Furthermore, by placing the clamping assembly 302 on the side of the weighing balance 301, and in conjunction with the rotating gripper assembly 201 for opening the bottle cap, the bottle can be positioned on the weighing balance 301 without the need for other positioning mechanisms or modifications to the balance 301. This improves placement accuracy, not only enhancing weighing precision and reducing errors caused by bottle placement deviations, but also facilitating smooth cap resetting.

[0044] This invention uses a rotating gripper assembly 201 to hold and fix the cap of a square bottle 6 and move it above a gripper assembly 302. After the bottle is fixed by the gripper assembly 302, the rotating gripper assembly 201 drives the cap to rotate and move upward to open it, thus realizing the cap opening process. The position of the gripper assembly 302 does not need to change during the entire capping process. After the cap is opened, the gripper assembly 302 moves upward to fix the hopper of the sampler 4. The rotating gripper assembly 201 drives the screw feeder to rotate and move upward to realize the feeding process. The entire feeding process only requires the gripper assembly 302 to move vertically upward and fix its position in the early stage, and its position does not change. Therefore, there is no interference problem between the clamping fixation and the clamping rotation, ensuring the practical effect of this invention.

[0045] The present invention sets the outer surface of the container 6 as a rectangular structure and sets a matching rectangular placement groove on the placement plate of the container 6. The rectangular structure is used for circumferential positioning and fixation. Therefore, when opening the cap for the second time, there is no need for the corresponding clamping component 302 to fix and cooperate for capping. Liquid extraction can be performed only in the placement area of ​​the container 6, without the need for a separate operating space, thereby shortening the operation time and simplifying the process steps.

[0046] The rotating gripper assembly 201 and the metering liquid dispensing assembly 203 are fixedly mounted on the left toothed plate 2041. The metering liquid dispensing assembly 203 includes a volumetric pump 2031 that provides a metered amount of liquid and an injection head 2032 that is connected to the outlet of the volumetric pump 2031 through a corresponding conduit. The injection head 2032 is fixedly mounted on the outside of the housing of the power body 2011.

[0047] In this invention, the quantitative liquid dispensing component 203 is directly and fixedly connected to the rotating gripper component 201 in parallel and moves up and down with the rotating gripper component 201. It is driven to move forward, backward, left and right by the same two-dimensional mechanism 14. No additional rotating drive mechanism is needed to drive the quantitative liquid dispensing component 203 to rotate and calibrate it with the square bottle 6. After capping, the quantitative liquid dispensing component 203 and the square bottle 6 can be calibrated and dispensed by driving the two-dimensional mechanism 14. This can also effectively avoid the interference problem between the quantitative liquid dispensing component 203 and the rotating gripper component 201, and further improve the practical effect of this invention.

[0048] The clamping claw 3021 has a rectangular groove 5021 on its opposite side that is adapted to the body of the square bottle 6, and an arc-shaped groove 5022 adapted to the hopper of the sampler 4 is recessed in the middle of the rectangular groove 5021.

[0049] The clamping claws of the clamping assembly 302 of the present invention are not only provided with rectangular grooves 5021 that are adapted to the body of the square bottle 6, but also with arc-shaped grooves 5022 that are adapted to the hopper of the sampler 4. On the basis of realizing dual use of one claw, the stability of clamping is improved by rectangular grooves 5021 and arc-shaped grooves 5022.

[0050] The power mechanism 3022 is driven to move up and down by a corresponding linear motor module 3023. The linear motor module 3023 includes a slide block 30232 that moves up and down along a travel track 30231. The slide block 30232 is screwed onto a lead screw fixed to the output shaft end of the drive motor 30233. A corresponding second inductive switch 30234 is provided on the upper and lower sides of the travel track 30231.

[0051] The weighing and feeding mechanism 3 also includes a scanner 304 fixedly installed on the top of the travel track 30231 via a corresponding base. The scanning area of ​​the scanner 304 is arranged facing the weighing balance 301. A bottle cap holder 303 is installed on the side of the weighing balance 301 where the clamping assembly 302 is not provided. The top of the bottle cap holder 303 is provided with a groove 3031 that is adapted to the bottle cap of the square bottle 6.

[0052] The present invention sets up a scanner 304 to correspond one-to-one with the sampler 4 and the square bottle 6, avoiding sample confusion, ensuring the accuracy of the experiment, and without the need for other positioning mechanisms, the scanner 304 can be used for positioning to promote the precise movement of the rotating gripper assembly 201 to the sampler 4. The upward movement of the clamping assembly 302 can achieve precise clamping and fixing of the sampler 4, and the rotating gripper assembly 201 can be used to realize the unloading action, ensuring the practical effect of the present invention.

[0053] It should be noted that this embodiment is implemented in the same way as embodiment one in terms of principle and technical effect. For the sake of brevity, any parts not mentioned in this embodiment can be referred to the corresponding content in embodiment one.

[0054] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A pretreatment method for conventional chemical analysis of tobacco, characterized in that, The specific steps include the following: S1, quantitative feed: S11, transfer to remove cap: the cap of the square bottle (6) is picked up by the rotating gripper assembly (201) and moved above the weighing balance (301). The bottle body of the square bottle (6) is clamped and fixed by the clamping assembly (302). The rotating gripper assembly (201) rotates and drives the cap to unscrew the bottle body and place it in the corresponding position. S12, Powder addition: The rotating gripper assembly (201) grips the screw feeder of the sampler (4) and moves it directly above the capped square bottle (6). The clamping assembly (302) moves up and clamps the hopper of the sampler (4). The rotating gripper assembly (201) drives the screw feeder to rotate upward and add the powder in the sampler (4) to the capped square bottle (6) until the weight reaches the set value of the weighing balance (301). The screw feeder and the hopper are then reversed and the sampler (4) is reset. S13, Liquid addition: The liquid is added quantitatively by driving the quantitative liquid addition component (203) to move its inlet to face the capped square bottle (6); S14, Reset: The square bottle (6) is reset after the cap is put on by cooperating with the rotating jaw assembly (201) and the clamping assembly (302). S2, Shaking Extraction: The liquid in the container (6) is shaken and mixed by starting the shaker (13); S3, filtration separation S31, Needle assembly: The suction nozzle of the suction assembly (202) moves and inserts the pipette (10) through an interference fit. S32, Secondary cap removal: While the rotating gripper assembly (201) moves down, the liquid extraction assembly (202) simultaneously drives the inserted pipette (10) to move up and offset to make room. With the second placement plate on the shaker (13) to fix the bottle (6) circumferentially, the rotating gripper assembly (201) grips and rotates the bottle cap of the bottle (6) to remove the cap. The rotating gripper assembly (201) moves and offsets the bottle cap and bottle body so that the pipette (10) is directly facing the bottle body and bottle mouth. S33, liquid extraction, the liquid extraction component (202) moves down and drives the pipette (10) to be inserted into the bottle body to extract the supernatant. At the same time as the liquid extraction component (202) moves down, the rotating gripper component (201) drives the top cover to move up and misalign to make room. S34, Secondary capping: The rotating gripper assembly (201) moves to face the bottle and then rotates downward to reset the bottle cap; S35, Filtration: The liquid extraction assembly (202) moves the pipette (10) after extraction to the top of the storage bottle (8) and inserts it into the filter (15) at the mouth of the storage bottle (8) to release the liquid. The liquid flows into the storage bottle (8) after being filtered by the filter (15). S4, Dismantle and reset: Move the liquid extraction assembly (202) and drive the pipette (10) with the filter (15) inserted at the end to the collection box (12), push the pipette (10) and the filter (15) out of the liquid extraction assembly (202), and then reset.

2. The pretreatment method for conventional chemical analysis of tobacco according to claim 1, characterized in that, The pretreatment method further includes step S5, waste liquid removal, which includes... S51, needle secondary assembly: the inlet of the drain assembly (205) moves and the pipette (10) is inserted through an interference fit. S52, three-stage cap removal: while the rotating gripper assembly (201) moves down, the drain assembly (205) simultaneously drives the inserted pipette (10) to move up and offset to create space. In conjunction with the second placement plate on the shaker (13), the bottle (6) is fixed circumferentially. The rotating gripper assembly (201) grips and rotates the bottle cap of the bottle (6) to remove the cap. The rotating gripper assembly (201) moves and offsets the bottle cap and bottle body so that the pipette (10) is directly facing the bottle body and bottle mouth. S53, draining, the draining component (205) moves down and drives the pipette (10) to be inserted into the bottle body to extract waste liquid. At the same time as the draining component (205) moves down, the rotating gripper component (201) drives the top cover to move up and misalign to make room. S54, triple capping: The rotating gripper assembly (201) moves to face the bottle and then rotates downward to reset the bottle cap; S55, move the drain assembly (205) onto the collection box (12), push the pipette (10) out of the suction assembly (202) and reset it.

3. The pretreatment method for conventional chemical analysis of tobacco according to claim 1, characterized in that, Before quantitative feeding in step S1, there are also equipment reserves. The sampler (4), square bottle (6), liquid storage round bottle (8), and pipette (10) are prepared manually and mechanically and placed in the corresponding positions of the continuous flow analysis pretreatment equipment. The liquid storage round bottle (8) is fixedly equipped with a cross soft rubber stopper and is connected to a filter (15). An appropriate amount of powder is put into the sampler (4).

4. The pretreatment method for conventional chemical analysis of tobacco according to claim 1, characterized in that, The pretreatment method is implemented based on a continuous flow analysis pretreatment device, which includes a housing (1). The housing (1) is provided with a corresponding storage area. The storage area is provided with a first storage plate (5) for placing a sampler (4), a second storage plate (7) for placing a square bottle (6), a third storage plate (9) for placing a liquid storage round bottle (8), a storage rack (11) for placing clean pipettes (10), and a collection box (12) for placing waste pipettes (10). The oscillator (13) and the second plate (7) are fixedly mounted on the oscillator (13) for shaking the powder in the bottle (6); The multifunctional robotic arm (2) includes a rotating gripper assembly (201) and a liquid extraction assembly (202) that are synchronously and staggered in the vertical position, and a quantitative liquid addition assembly (203) that is fixedly installed with the rotating gripper assembly (201). The multifunctional robotic arm (2) is driven to move forward, backward, left and right through a corresponding two-dimensional mechanism (14). The weighing and feeding mechanism (3) includes a weighing balance (301) and a clamping assembly (302). The clamping assembly (302) can be longitudinally moved and installed on the side of the weighing balance (301). The clamping assembly (302) can clamp and fix the body of the square bottle (6) and cooperate with the rotating jaw assembly (201) to unscrew the bottle cap. It can also be used to clamp and fix the hopper of the sampler (4) and cooperate with the rotating jaw assembly (201) to pull up and rotate the spiral feeder of the sampler (4) for powder addition.

5. The pretreatment method for conventional chemical analysis of tobacco according to claim 4, characterized in that, The rotating gripper assembly (201) and the liquid extraction assembly (202) are synchronously driven vertically and vertically through corresponding misalignment drive assemblies (204). The misalignment drive assembly (204) includes a left toothed plate (2041) and a right toothed plate (2042) longitudinally opposite to each other and vertically and misaligned, mounted on a support base (2044). Corresponding racks are evenly distributed on the opposite sides of the left toothed plate (2041) and the right toothed plate (2042). All of them are meshed with the same drive gear (2043), which is fixedly connected to the output shaft end of the rotary motor (2045) mounted on the support base (2044). When the top of the left tooth plate (2041) meshes with the drive gear (2043), the bottom of the right tooth plate (2042) meshes with the drive gear (2043). The support base (2044) is mounted on the two-dimensional mechanism (14) and is driven to move by the two-dimensional mechanism (14).

6. The pretreatment method for conventional chemical analysis of tobacco according to claim 5, characterized in that, The support base (2044) is also fixedly provided with corresponding linear guide rails (2046) on the outside of the left toothed plate (2041) and the right toothed plate (2042). The left toothed plate (2041) and the right toothed plate (2042) are respectively fixedly provided with sliders (2047) connected to the corresponding linear guide rails (2046). The upper and lower ends of the side of the support base (2044) are provided with corresponding first inductive switches (2048). The left toothed plate (2041) or the right toothed plate (2042) on the same side as the first inductive switch (2048) is fixedly installed with a sensing element (2049). The sensing element (2049) is located between the two first inductive switches (2048).

7. The pretreatment method for conventional chemical analysis of tobacco according to claim 5, characterized in that, The liquid extraction assembly (202) is fixedly installed on the right toothed plate (2042). The liquid extraction assembly (202) includes a liquid extraction nozzle (2022) connected to an air pump (2021) and a connector (2023) that is driven to move up and down on the outside of the liquid extraction nozzle (2022) by a corresponding driving mechanism. Before extraction, the liquid extraction nozzle (2022) is inserted into the pipette (10) with an interference fit. After extraction, the connector (2023) is driven down by the driving mechanism to push the pipette (10) out of the liquid extraction nozzle (2022).

8. The pretreatment method for conventional chemical analysis of tobacco according to claim 7, characterized in that, The right toothed plate (2042) is equipped with a drain assembly (205) that is offset from the liquid pumping assembly (202). The drain assembly (205) includes a drain nozzle (2051) connected to the drain pump through a corresponding drain pipe. The other side of the connector (2023) is sleeved on the outside of the drain nozzle (2051). Before draining, the drain nozzle (2051) is inserted into the pipette (10) with an interference fit. After draining, the connector (2023) is driven down by the drive mechanism to push the pipette (10) out of the drain nozzle (2051).

9. The pretreatment method for conventional chemical analysis of tobacco according to claim 4, characterized in that, The rotating gripper assembly (201) includes a power body (2011) and a set of rotating grippers (2012) mounted on the drive end of the power body (2011) via a corresponding connecting plate (2013). The set of rotating grippers (2012) are driven by the power body (2011) to move synchronously relative to each other and rotate synchronously.

10. The pretreatment method for conventional chemical analysis of tobacco according to claim 4, characterized in that, The clamping assembly (302) includes a set of clamping jaws (3021) driven by a power mechanism (3022) to move synchronously relative to each other. The clamping jaws (3021) have rectangular grooves on opposite sides that are adapted to the body of the square bottle (6), and an arc-shaped groove adapted to the hopper of the sampler (4) is recessed in the middle of the rectangular groove. The power mechanism (3022) is driven to move up and down by a corresponding linear motor module (3023). The linear motor module (3023) includes a slide (30232) that moves up and down along a travel track (30231). The slide (30232) is screwed onto a lead screw fixed to the output shaft of the drive motor (30233). The upper and lower sides of the travel track (30231) are provided with corresponding second induction switches (30234).

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