Intelligent food and medicine sulfur dioxide tester

Abstract

This invention discloses an intelligent sulfur dioxide analyzer for food and pharmaceuticals, belonging to the field of analyzer technology. It includes a distillation assembly and a supply assembly. The distillation assembly has a spherical stirring chamber with a spiral track on its inner wall. The stirring unit includes a stirring rod driven by a drive shaft, which is connected to the drive shaft via a telescopic structure. A rolling element at the rod's end engages with the spiral track, allowing the stirring rod to spiral up and down along the track while revolving, thus achieving three-dimensional stirring without dead angles. The heating unit includes an excitation coil and an external electric heating plate. The stirring plate is made of induction metal, which can generate induced heat in an alternating magnetic field, achieving simultaneous internal and external heating and significantly improving reaction efficiency. The supply assembly is used to supply the sample, acid, and nitrogen to the stirring chamber. This invention effectively solves the problems of uneven mixing, slow heating, and easy deposition in traditional analyzers through a combined stirring motion and a synergistic internal and external heating mechanism, significantly improving the distillation speed and detection accuracy of sulfur dioxide.

Description

Technical Field

[0001] This invention relates to the field of measuring instrument technology, specifically an intelligent food and drug sulfur dioxide measuring instrument. Background Technology

[0002] In the field of food and drug safety testing, sulfur dioxide, as a commonly used bleaching agent, preservative, and antioxidant, is crucial for accurate determination of its residue levels, which is essential for protecting consumer health and ensuring regulatory compliance. Accurate determination of sulfur dioxide content is critical, and the commonly used method is a chemical detection method based on acid distillation. Currently, mainstream sulfur dioxide analyzers on the market have significant technical bottlenecks in the distillation process. The stirring devices in these analyzers are mostly simple blade rotations, resulting in numerous dead zones within the distillation vessel. This leads to uneven mixing of the reaction solution, slow reaction rates, and easy precipitation at the bottom, affecting the representativeness of the sample and the consistency of the final test results. Summary of the Invention

[0003] The purpose of this invention is to provide an intelligent sulfur dioxide analyzer for food and pharmaceuticals to solve the problems raised in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an intelligent food and drug sulfur dioxide analyzer, the analyzer comprising a distillation component and a supply component;

[0005] The distillation assembly includes a stirring unit, a heating unit, and a drive source;

[0006] The stirring unit includes a stirring chamber, a drive shaft, a stirring rod, and a stirring component. The stirring chamber is provided with a spherical cavity, and a track is provided on the spherical cavity. The track is spirally distributed along the spherical cavity.

[0007] The drive shaft is mounted on the mixing chamber and connected to the output end of the drive source. One end of the stirring rod is mounted in the track, and the other end of the stirring rod is mounted on the drive shaft. The stirring component is mounted on the stirring rod.

[0008] The heating unit includes an excitation assembly, a heating element, and a temperature measuring element, all of which are mounted on the stirring chamber.

[0009] The supply assembly is connected to the mixing chamber. The excitation assembly is a coil, the heating element is an electric heating plate, and the temperature measuring element is a temperature sensor. The excitation assembly and the temperature measuring element are electrically connected to the control system.

[0010] According to the preset working steps, the control system delivers the sample, acid, and nitrogen to the stirring chamber through the supply component. At the same time, the control system drives the drive shaft to rotate in the forward direction through the drive source. The rotation of the drive shaft drives the fixed cylinder to revolve around the axis of the drive shaft. The fixed cylinder drives the telescopic cylinder to follow the revolution through the sliding parts and sliding grooves. Since the rolling parts on the telescopic cylinder are installed in the spirally distributed track, the rolling parts are forced to slide upward along the spiral track while revolving, thereby causing the telescopic cylinder to generate an upward displacement based on the revolution.

[0011] The combined motion of the stirring plate—revolution and spiral upward motion accompanied by expansion and contraction—enhances the reaction rate. Furthermore, the spherical stirring chamber is less prone to impurity deposition, together forming a three-dimensional, dead-angle-free stirring of the reaction liquid from top to bottom.

[0012] The stirring rod consists of a fixed cylinder and a telescopic cylinder. One end of the fixed cylinder is rotatably connected to the drive shaft, and the other end of the fixed cylinder is connected to the telescopic cylinder through a sliding component. A rolling element is rotatably installed at the end of the telescopic cylinder away from the fixed cylinder, and the rolling element rolls in the track.

[0013] The agitator is mounted on the telescopic cylinder.

[0014] The rolling element consists of two rolling balls and a connector. The two rolling balls are connected by the connector. One rolling ball is rotatably mounted on the telescopic cylinder, while the other rolling ball rolls in the track. The connector is made of rigid or elastic material.

[0015] The stirring component includes a stirring plate and a sleeve, wherein the stirring plate is mounted on the telescopic cylinder via the sleeve.

[0016] The stirring plate is an arc-shaped plate structure.

[0017] The surface of the stirring plate is distributed with multiple flow guide holes. The stirring plate is made of induction heating metal and has an internal sandwich layer filled with a heat-conducting medium.

[0018] The sliding assembly includes a sliding groove and a sliding member. The sliding groove is disposed on the telescopic cylinder, and the sliding member is disposed on the fixed cylinder. The sliding member is slidably connected to the sliding groove.

[0019] The sliding groove is a rectangular groove, and an elastic element connects the fixed cylinder and the telescopic cylinder. The sliding element is a sliding plate, and the elastic element is a return spring.

[0020] The sliding groove is spirally distributed, and a rotating plate is rotatably mounted at one end of both the fixed cylinder and the telescopic cylinder. An elastic element connects the two rotating plates. The sliding element is a sliding shaft, and the elastic element is a return spring.

[0021] The system includes a main body, a stirring chamber mounted on the main body, a distillation flask connected to the stirring chamber, and a sample cup connected to the distillation flask via a condensation system.

[0022] The supply assembly includes an acid supply unit and a nitrogen supply unit, both of which are connected to a distillation flask and are mounted on the main body.

[0023] The condensation system includes a condenser tube and a condenser component. The condenser tube connects the distillation flask and the sample cup, and the condenser component is installed inside the condenser tube.

[0024] The condenser cools the distilled gas in the condenser tube through the Peltier effect, so that the cooled liquid is transported to the sample cup through the condenser tube, and the staff tests the liquid in the sample cup.

[0025] The acid supply unit includes an acid addition cylinder and a conveying unit, which are mounted on the main body. The outlet of the acid addition cylinder is connected to the conveying unit, and the outlet of the conveying unit is connected to a distillation flask. The conveying unit is a pump that, according to the process steps, delivers the acid from the acid addition cylinder to the distillation flask for testing.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. Achieves highly efficient three-dimensional stirring, significantly improving mixing uniformity and reaction rate. The stirring rod revolves under the drive shaft, while its end-mounted rolling element is constrained by a helical track within the spherical chamber, forcing the stirring rod to generate an axial motion of spiral ascent or descent during its revolution. The telescopic structure of the stirring rod allows it to automatically adjust its length (stirring radius) according to its height position within the spherical chamber, thus always moving close to the inner wall; it completely eliminates the stirring blind zone within the spherical reaction vessel, achieving strong convection and shearing of the reaction liquid throughout the entire chamber, ensuring instantaneous and thorough mixing of the sample, acid, and carrier gas.

[0028] 2. Employing a combined internal and external heating mechanism achieves rapid and uniform temperature control, significantly shortening the testing cycle. In the alternating magnetic field generated by the excitation coil, the stirring plate, made of induction-heating metal, generates eddy current heat by cutting magnetic field lines. Simultaneously, an electric heating plate installed on the outer wall of the stirring chamber provides stable external radiant heat. The control system synchronously adjusts the power of both; this dual-heating mode overcomes the shortcomings of single external heating, such as high thermal resistance, slow temperature rise, and significant internal and external temperature differences. Induction heating makes the stirring plate itself a highly efficient heat source, with heat generated directly from within the reaction liquid and diffused outwards; external heating compensates for heat dissipation from the chamber. The synergy of these two mechanisms allows the reaction system to quickly and uniformly reach the target temperature, minimizing the temperature gradient; it accelerates individual testing processes and helps maintain the stability of reaction conditions, thereby ensuring the complete and stable distillation of sulfur dioxide.

[0029] 3. High-efficiency condensation treatment enhances detection accuracy. The condensation system employs a Peltier effect-based condenser, directly installed within the condenser tube. The control system precisely controls the temperature of the condensation zone by adjusting the operating current of the Peltier element, achieving efficient cooling of the distilled gas. Compared to traditional water-cooled condensation methods, Peltier condensation technology achieves fluidless operation, miniaturization, and precise temperature control. It eliminates the need for an external circulating water source, simplifying the equipment structure, reducing usage and maintenance costs, and avoiding the instability in condensation efficiency caused by water temperature fluctuations. Precise program control of the cold end temperature ensures that the distilled gas condenses into liquid with optimal efficiency, reducing the escape loss of volatile components and guaranteeing complete and stable collection of the condensate in the sample cup. This improves the recovery rate of the target analyte (sulfur dioxide), enhancing detection accuracy and repeatability. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the acid-adding cylinder in this invention;

[0032] Figure 3 This is a schematic diagram of the stirring chamber in this invention;

[0033] Figure 4 This is a schematic diagram of the drive shaft structure in this invention;

[0034] Figure 5 This is a schematic diagram of the structure of the fixed cylinder in this invention;

[0035] Figure 6 This is a schematic diagram of the telescopic cylinder in this invention;

[0036] Figure 7 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0037] Figure 8 yes Figure 7 A magnified view of a portion of region A in the middle;

[0038] Figure 9 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0039] In the diagram: 1. Distillation assembly; 101. Distillation flask; 11. Stirring chamber; 111. Track; 12. Drive shaft; 13. Stirring rod; 131. Fixed cylinder; 1311. Sliding groove; 132. Telescopic cylinder; 1321. Sliding component; 133. Rolling component; 14. Stirring component; 141. Stirring plate; 142. Sleeve; 15. Heating component; 2. Supply assembly; 21. Acid supply unit; 211. Acid addition cylinder; 22. Nitrogen supply unit; 3. Sample cup; 4. Condensation system; 41. Condenser tube. Detailed Implementation

[0040] 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.

[0041] Example: Figures 1-9 As shown, this invention provides a technical solution for an intelligent food and drug sulfur dioxide analyzer. The analyzer includes a distillation component 1, a supply component 2, and a main body. The distillation component 1 includes a stirring unit, a heating unit, and a drive source (not shown in the figure). The stirring unit includes a stirring chamber 11, a drive shaft 12, a stirring rod 13, and a stirring element 14. A spherical cavity is provided on the stirring chamber 11, and a track 111 is provided on the spherical cavity. The track 111 is spirally distributed along the spherical cavity. The drive shaft 12 is installed on the stirring chamber 11 and is connected to the output end of the drive source. One end of the stirring rod 13 is installed in the track 111, and the other end of the stirring rod 13 is installed on the drive shaft 12. The stirring element 14 is installed on the stirring rod 13. The heating unit includes an excitation component (not shown in the figure), a heating element 15, and a temperature measuring element. The excitation component, the heating element 15, and the temperature measuring element are all installed on the stirring chamber 11. The supply component 2 is connected to the stirring chamber 11. The driving source is a drive motor, the excitation component is a coil, the heating element 15 is an electric heating plate, and the temperature measuring element is a temperature sensor. The excitation component and the temperature measuring element are electrically connected to the control system.

[0042] The stirring chamber 11 is installed on the main body and is connected to the distillation flask 101. The stirring chamber 11 and the distillation flask 101 are connected by a pipe. The distillation flask 101 is connected to the sample cup 3 through the condensation system 4. The supply component 2 includes an acid supply unit 21 and a nitrogen supply unit 22. Both the acid supply unit 21 and the nitrogen supply unit 22 are connected to the distillation flask 101 and are installed on the main body.

[0043] The condensation system 4 includes a condenser tube 41 and a condenser. The condenser tube 41 connects the distillation flask 101 and the sample cup 3, and the condenser is installed inside the condenser tube 41. Solenoid valves and flow meters are installed in the condenser tube 41 and the connecting pipes between the stirring chamber 11 and the distillation flask 101 to ensure stable operation of the instrument. The condenser cools the distilled gas inside the condenser tube 41 through the Peltier effect, allowing the cooled liquid to be transported through the condenser tube 41 to the sample cup 3, where the liquid is then analyzed.

[0044] The acid supply unit 21 includes an acid addition cylinder 211 and a conveying unit. The acid addition cylinder 211 and the conveying unit are mounted on the main body. The outlet of the acid addition cylinder 211 is connected to the conveying unit, and the outlet of the conveying unit is connected to the distillation flask 101. The conveying unit is a conveying pump. The conveying pump conveys the acid in the acid addition cylinder 211 to the distillation flask 101 according to the process steps for testing.

[0045] According to the preset working steps, the control system delivers the sample, acid and nitrogen to the stirring chamber 11 through the supply component 2. At the same time, the control system drives the drive shaft 12 to rotate in the forward direction through the drive source. The rotation of the drive shaft 12 drives the fixed cylinder 131 to revolve around the axis of the drive shaft 12. The fixed cylinder 131 drives the telescopic cylinder 132 to follow the revolution through the sliding member 1321 and the sliding groove 1311. Since the rolling member 133 on the telescopic cylinder 132 is installed in the spirally distributed track 111, the rolling member 133 is forced to slide upward along the spiral track 111 while revolving, so that the telescopic cylinder 132 generates an upward displacement based on the revolution.

[0046] The combined motion of the stirring plate 141, namely the revolution and the spiral upward motion accompanied by expansion and contraction, increases the reaction rate. In addition, the spherical stirring chamber 11 is not prone to the deposition of impurities. Together, they form a three-dimensional space without dead angle stirring of the reaction liquid from top to bottom.

[0047] During the forward and reverse rotation of the drive shaft 12, the control system energizes the excitation assembly and the heating element 15, generating an alternating magnetic field through the excitation assembly. The stirring plate 141 cuts the magnetic field lines within the alternating magnetic field, causing current to flow through it and generating heat. The stirring plate 141 heats the reaction liquid from the inside, while the heating element 15 heats the reaction liquid from the outside through resistance heating. The reaction liquid is heated both inside and outside simultaneously to enable rapid reaction.

[0048] The stirring rod 13 is composed of a fixed cylinder 131 and a telescopic cylinder 132. One end of the fixed cylinder 131 is rotatably connected to the drive shaft 12, and the other end of the fixed cylinder 131 is connected to the telescopic cylinder 132 through a sliding component. A rolling element 133 is rotatably installed at one end of the telescopic cylinder 132 away from the fixed cylinder 131. The rolling element 133 rolls in the track 111. The stirring element 14 is installed on the telescopic cylinder 132.

[0049] The rolling element 133 consists of two rolling balls and a connector. The two rolling balls are connected by the connector. One rolling ball is rotatably mounted on the telescopic cylinder 132, and the other rolling ball rolls in the track 111. The connector is made of rigid or elastic material.

[0050] The stirring component 14 includes a stirring plate 141 and a sleeve 142. The stirring plate 141 is mounted on the telescopic cylinder 132 through the sleeve 142. The stirring plate 141 has an arc-shaped plate structure. Multiple flow guide holes are distributed on the surface of the stirring plate 141. The stirring plate 141 is made of induction heating metal. A jacket is provided inside the stirring plate 141, and the jacket is filled with a heat-conducting medium.

[0051] The sliding assembly includes a sliding groove 1311 and a sliding member 1321. The sliding groove 1311 is disposed on the telescopic cylinder 132, and the sliding member 1321 is disposed on the fixed cylinder 131. The sliding member 1321 is slidably connected to the sliding groove 1311.

[0052] Example 1:

[0053] The sliding groove 1311 is a rectangular groove, and an elastic element connects the fixed cylinder 131 and the telescopic cylinder 132. The sliding element 1321 is a sliding plate, and the elastic element is a return spring.

[0054] In the initial state, the rolling element 133 is located at the bottom of the track 111.

[0055] During the forward rotation of the drive shaft 12, the rolling element 133 moves upward from the bottom of the spiral track 111;

[0056] As the rolling element 133 moves from the bottom of the track 111 to the horizontal center line of the mixing chamber 11, the telescopic cylinder 132 gradually retracts into the fixed cylinder 131 through the rectangular sliding groove 1311 to adapt to the geometry of the spherical mixing chamber 11 which gradually expands outward from the bottom to the horizontal center line. At this time, the elastic element between the fixed cylinder 131 and the telescopic cylinder 132 is compressed at the same time, and the distance between the fixed cylinder 131 and the telescopic cylinder 132 is reduced, so that the mixing plate 141 installed on the telescopic cylinder 132 is closer to the drive shaft 12, so as to strongly mix the central area of ​​the mixing chamber 11.

[0057] As the rolling element 133 moves from the horizontal centerline of the mixing chamber 11 to the uppermost end of the track 111, the telescopic cylinder 132 gradually extends outward from the fixed cylinder 131 to adapt to the contour of the spherical mixing chamber 11 that gradually tapers from the horizontal centerline to the top. The elastic element between the fixed cylinder 131 and the telescopic cylinder 132 is stretched, causing the mixing plate 141 mounted on the telescopic cylinder 132 to approach the inner wall of the mixing chamber 11. The distance between the fixed cylinder 131 and the telescopic cylinder 132 increases, thereby increasing the running radius of the mixing plate 141 and effectively mixing the upper and top areas of the mixing chamber 11.

[0058] After completing the preset forward rotation time, the control system controls the drive shaft 12 to rotate in reverse via the drive source. At this time, the fixed cylinder 131 drives the telescopic cylinder 132 to rotate in the opposite direction, and the rolling element 133 slides downward along the spiral track 111. The sequence of changes in the distance between the telescopic cylinder 132 and the fixed cylinder 131 is the reverse of that during forward rotation: as the telescopic cylinder 132 and the fixed cylinder 131 move downward from the top, the distance between the telescopic cylinder 132 is larger to cover the top area, and then after crossing the horizontal center line downward, the distance gradually decreases to concentrate the stirring of the middle and lower parts. This process achieves strong three-dimensional stirring from top to bottom.

[0059] Example 2:

[0060] The sliding groove 1311 is spirally distributed. Rotary plates (not shown in the figure) are rotatably mounted on opposite ends of the fixed cylinder 131 and the telescopic cylinder 132. An elastic element connects the two rotary plates. The sliding element 1321 is a sliding shaft, and the elastic element is a return spring (not shown in the figure).

[0061] In the initial state, the rolling element 133 is located at the bottom of the track 111.

[0062] During the forward rotation of the drive shaft 12, the rolling element 133 moves upward from the bottom of the spiral track 111;

[0063] During the process of the rolling element 133 moving from the bottom of the track 111 to the horizontal center line of the mixing chamber 11, in order to adapt to the geometry of the spherical mixing chamber 11 gradually expanding outward from the bottom to the horizontal center line, the telescopic cylinder 132 gradually retracts into the fixed cylinder 131 through the spiral sliding groove 1311 because the sliding element 1321 is slidably connected to the spiral sliding groove 1311. At the same time, the telescopic cylinder 132 drives the mixing plate 141 to rotate in the forward direction. At this time, the elastic element between the fixed cylinder 131 and the telescopic cylinder 132 is compressed at the same time, and the distance between the fixed cylinder 131 and the telescopic cylinder 132 is reduced, so that the mixing plate 141 installed on the telescopic cylinder 132 is closer to the drive shaft 12, so as to strongly mix the mixing effect of the central area of ​​the mixing chamber 11.

[0064] As the rolling element 133 moves from the horizontal centerline of the mixing chamber 11 to the uppermost end of the track 111, the telescopic cylinder 132 gradually extends outward from the fixed cylinder 131 to adapt to the contour of the spherical mixing chamber 11 gradually converging from the horizontal centerline to the top. At this time, the telescopic cylinder 132 drives the mixing plate 141 to rotate in the opposite direction through the spiral sliding groove 1311. The elastic element between the fixed cylinder 131 and the telescopic cylinder 132 is stretched, causing the mixing plate 141 mounted on the telescopic cylinder 132 to approach the inner wall of the mixing chamber 11. The distance between the fixed cylinder 131 and the telescopic cylinder 132 increases, thereby increasing the running radius of the mixing plate 141 and effectively mixing the upper and top areas of the mixing chamber 11.

[0065] The telescopic cylinder 132 extends and retracts, causing the stirring plate 141 to rotate in both directions, thereby improving the mixing effect, increasing distillation efficiency, and accelerating the testing time.

[0066] After completing the preset forward rotation time, the control system controls the drive shaft 12 to rotate in reverse via the drive source. At this time, the fixed cylinder 131 drives the telescopic cylinder 132 to rotate in the opposite direction, and the rolling element 133 slides downward along the spiral track 111. The sequence of changes in the distance between the telescopic cylinder 132 and the fixed cylinder 131 is the reverse of that during forward rotation: as the telescopic cylinder 132 and the fixed cylinder 131 move downward from the top, the distance between the telescopic cylinder 132 is larger to cover the top area, and then after crossing the horizontal center line downward, the distance gradually decreases to concentrate the stirring of the middle and lower parts. This process achieves strong three-dimensional stirring from top to bottom.

[0067] Working principle: First, the sample to be tested is placed in the distillation flask 101. According to the process steps, the acid supply unit 21 delivers the acid in the acid addition cylinder 211 to the distillation flask 101 through the transfer pump, and the nitrogen supply unit 22 introduces nitrogen into the distillation flask 101.

[0068] After the sample to be tested is transported to the distillation flask 101, the drive source drives the drive shaft 12 to rotate in the forward direction. The drive shaft 12 drives the fixed cylinder 131 to revolve around the axis of the drive shaft 12. The fixed cylinder 131 drives the telescopic cylinder 132 to follow the revolution through the sliding component. The rolling element 133 on the telescopic cylinder 132 is forced to slide upward along the track 111 in the spherical chamber of the stirring chamber 11 because it is installed in the spiral track 111. This causes the telescopic cylinder 132 to move upward based on the revolution. The telescopic cylinder 132 drives the stirring plate 141 to perform a combined motion of revolution and spiral upward movement accompanied by expansion and contraction, so as to achieve three-dimensional space stirring of the reaction liquid from top to bottom without dead angles.

[0069] When the rolling element 133 moves to the uppermost end of the track 111, the encoder inside the drive source feeds the data back to the control system. The control system controls the drive source to drive the drive shaft 12 to rotate in the opposite direction, so that the rolling element 133 slides down along the spiral track 111. The distance between the telescopic cylinder 132 and the fixed cylinder 131 changes in the opposite order to the forward rotation, realizing reverse three-dimensional strong stirring from top to bottom, further ensuring the fullness of the reaction and ensuring the accuracy of the detection.

[0070] During the stirring of the reaction liquid by the stirring plate 141, the control system energizes the excitation component and the heating element 15. The excitation component generates an alternating magnetic field, and the stirring plate 141 cuts the magnetic field lines in the magnetic field to generate current and heat up, heating the reaction liquid from the inside. The heating element 15 heats the reaction liquid from the outside through resistance heating. The temperature measuring element monitors the temperature in real time and feeds it back to the control system, realizing simultaneous heating of the reaction liquid inside and outside to accelerate the reaction. The distilled gas generated by the reaction enters the condenser tube 41 through the distillation flask 101. The condenser in the condenser tube 41 cools the distilled gas in the condenser tube 41 through the Peltier effect. The cooled liquid is transported to the sample cup 3 through the condenser tube 41. Finally, the staff tests the sulfur dioxide content of the liquid in the sample cup 3.

[0071] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An intelligent food and drug sulfur dioxide analyzer, characterized in that: The measuring instrument includes a distillation assembly (1) and a supply assembly (2); The distillation assembly (1) includes a stirring unit, a heating unit, and a driving source; The stirring unit includes a stirring chamber (11), a drive shaft (12), a stirring rod (13), and a stirring component (14). The stirring chamber (11) is provided with a spherical cavity, and a track (111) is provided on the spherical cavity. The track (111) is spirally distributed along the spherical cavity. The drive shaft (12) is installed on the stirring chamber (11), the drive shaft (12) is connected to the output end of the drive source, one end of the stirring rod (13) is installed in the track (111), the other end of the stirring rod (13) is installed on the drive shaft (12), and the stirring component (14) is installed on the stirring rod (13); The heating unit includes an excitation assembly, a heating element (15), and a temperature measuring element, all of which are mounted on the stirring chamber (11). The supply component (2) is connected to the mixing chamber (11); The stirring rod (13) is composed of a fixed cylinder (131) and a telescopic cylinder (132). One end of the fixed cylinder (131) is rotatably connected to the drive shaft (12), and the other end of the fixed cylinder (131) is connected to the telescopic cylinder (132) through a sliding assembly. A rolling element (133) is rotatably installed on one end of the telescopic cylinder (132) away from the fixed cylinder (131), and the rolling element (133) rolls in the track (111). The stirring component (14) is mounted on the telescopic cylinder (132); The stirring component (14) includes a stirring plate (141) and a sleeve (142), wherein the stirring plate (141) is mounted on the telescopic cylinder (132) via the sleeve (142); The stirring plate (141) has an arc-shaped plate structure; The sliding assembly includes a sliding groove (1311) and a sliding member (1321). The sliding groove (1311) is disposed on the telescopic cylinder (132), and the sliding member (1321) is disposed on the fixed cylinder (131). The sliding member (1321) is slidably connected to the sliding groove (1311). The sliding groove (1311) is a rectangular groove, and an elastic element is connected between the fixed cylinder (131) and the telescopic cylinder (132).

2. The intelligent food and drug sulfur dioxide analyzer according to claim 1, characterized in that: The surface of the stirring plate (141) is provided with multiple flow guide holes. The stirring plate (141) is made of induction heating metal. The stirring plate (141) has an internal interlayer filled with a heat-conducting medium.

3. The intelligent food and drug sulfur dioxide analyzer according to claim 1, characterized in that: The sliding groove (1311) is spirally distributed. Rotary plates are rotatably installed at opposite ends of the fixed cylinder (131) and the telescopic cylinder (132). An elastic element connects the two rotary plates.

4. The intelligent food and drug sulfur dioxide analyzer according to claim 1, characterized in that: The stirring chamber (11) is connected to a distillation flask (101), and the distillation flask (101) is connected to a sample cup (3) through a condensation system (4). The supply component (2) includes an acid supply unit (21) and a nitrogen supply unit (22), both of which are connected to a distillation flask (101).

5. The intelligent food and drug sulfur dioxide analyzer according to claim 4, characterized in that: The condensation system (4) includes a condenser tube (41) and a condenser component. The condenser tube (41) connects the distillation flask (101) and the sample cup (3). The condenser component is installed inside the condenser tube (41).

6. The intelligent food and drug sulfur dioxide analyzer according to claim 5, characterized in that: The acid supply unit (21) includes an acid addition cylinder (211) and a conveying unit. The outlet of the acid addition cylinder (211) is connected to the conveying unit, and the outlet of the conveying unit is connected to the distillation flask (101).

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