Automatic reagent stirring device for chemical experiment and stirring method thereof

Abstract

The invention relates to the technical field of chemical stirring, in particular to an automatic reagent stirring device for chemical experiments and a stirring method thereof. Comprising a reaction tank, a titration frame and a central control unit, a displaceable liquid storage titration assembly is arranged on the titration frame, a double-spectrum sensor is mounted on the titration frame, the titration device further comprises a liftable protective frame and a lifting frame, two sealing covers with an adjustable distance are mounted on the protective frame, an online monitoring system for monitoring chemical liquid reaction data is arranged between the two sealing covers, and the central control unit is connected with the lifting frame. Arc clamping plates are installed on the two sealing covers, a motion generation system is installed on the lifting frame, and a motion frame capable of vertically moving in a reciprocating mode and a forward stirring shaft capable of alternately rotating forwards and backwards are connected to the motion generation system. Through cooperative linkage of the liquid storage titration assembly, the double-spectrum sensor and the central control unit, the problem of low titration precision of a traditional artificial chemical titration mode is solved.

Description

Technical Field

[0001] This invention relates to the field of chemical stirring technology, specifically to an automatic stirring device for chemical experimental reagents and its stirring method. Background Technology

[0002] In the field of chemical experiments, reagent stirring devices are key equipment for achieving uniform chemical reactions and improving reaction efficiency. They are widely used in laboratory synthesis, material preparation, analysis and detection, and other scenarios. However, as chemical experiments continue to demand higher precision, safety and automation, traditional stirring devices have gradually revealed many technical limitations and are unable to meet the needs of modern experiments.

[0003] In existing technologies, reagent titration largely relies on manual operation. Experimenters need to manually control the type and dosage of reagents, which is prone to mis-dosing due to visual errors and operator fatigue. It also has problems such as large dosage deviations and insufficient precision in mixing ratio control. These problems can lead to experimental failure or even dangerous chemical reactions. In addition, the traditional titration process lacks a real-time reagent identification mechanism, which makes it impossible to quickly verify the accuracy of reagent dosing, further increasing the experimental risks. In terms of fixing reaction vessels, traditional devices mostly use a single-specification clamping structure, which is difficult to adapt to reaction vessels of different volumes and shapes, and the clamping stability is poor, making the reaction vessel easy to shake or even tip over due to stirring vibration or external force. Most mainstream stirring devices currently use unidirectional rotation or fixed-speed stirring methods, resulting in a single stirring trajectory. When mixing high-viscosity reagents or multiphase systems, local uneven mixing and incomplete reaction are likely to occur, leading to low reaction efficiency and large fluctuations in product purity. In terms of reaction process monitoring, existing technologies mostly rely on manual periodic sampling and testing, which suffers from data lag and poor continuity, making it difficult to capture reaction dynamics in real time; Based on this, the present invention provides an automatic stirring device for chemical experimental reagents and its stirring method to solve the problems mentioned in the background art. Summary of the Invention

[0004] This invention addresses the technical problems existing in the prior art by providing an automatic stirring device for chemical experimental reagents and its stirring method.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an automatic stirring device for reagents in chemical experiments, comprising a reaction vessel, a titration rack and a central control unit, wherein the titration rack is provided with a displaceable liquid storage titration component and a dual-spectrum sensor is installed on the titration rack; It also includes a liftable protective frame and a lifting frame. The protective frame is equipped with two adjustable-spaced covers. An online monitoring system for monitoring chemical liquid reaction data is installed between the two covers. Both covers are equipped with arc clamps. The lifting frame is equipped with a motion generating system. The motion generating system is connected to a vertically reciprocating motion frame and a forward stirring shaft that can rotate alternately in both directions. The vertical motion stroke and motion frequency of the motion frame change periodically according to a sine curve. A reverse stirring shaft is rotatably mounted on the forward stirring shaft. The reverse stirring shaft is rotatably connected to the motion frame through a bearing. The forward and reverse stirring shafts rotate in opposite directions at the same speed. A quick-change bracket is magnetically attached to the motion frame. An outer stirring rod linked to the reverse stirring shaft is rotatably mounted on the quick-change bracket. An inner stirring rod linked to the forward stirring shaft is rotatably mounted on the inner wall of the outer stirring rod. Multiple sets of stirring paddles are mounted on both the outer and inner stirring rods.

[0006] As a preferred technical solution of the present invention, it also includes a frame on which two vertically arranged lead screw lifting modules are installed. The two lead screw lifting modules are respectively connected to the protective frame and the lifting frame. The central control unit is installed on the frame. The data terminal of the dual-spectrum sensor is connected to the central control unit. The dual-spectrum sensor includes a near-infrared spectral sensor and a Raman spectral sensor.

[0007] As a preferred technical solution of the present invention, the liquid storage titration assembly includes a linear transmission module mounted on a titration rack, a liquid storage support connected to the linear transmission module, the liquid storage support being slidably connected to the titration rack, a plurality of liquid storage tanks mounted on the liquid storage support, a drip valve connected to the bottom end of each liquid storage tank, the electrical control terminal of the drip valve being data connected to the central control unit, both the liquid storage tanks and the reaction vessel being made of high borosilicate glass, a support column mounted on the frame, and a locking pin engaged with the support column mounted on the titration rack.

[0008] As a preferred technical solution of the present invention, a bidirectional lead screw driven by an adjusting motor is rotatably mounted on the protective frame. The bidirectional lead screw is symmetrically provided with a forward thread section and a reverse thread section. A connecting frame is driven to both the forward thread section and the reverse thread section. Both connecting frames are slidably connected to the protective frame. The two connecting frames are respectively fixedly connected to two caps. A semi-through hole adapted to the external stirring rod is fixedly opened at the axial position of the cap. A sealing gasket is installed on the inner wall of the semi-through hole.

[0009] As a preferred technical solution of the present invention, the online monitoring system includes an infrared temperature probe, a pH electrode sensor and an exhaust valve installed on one cover, and an infrared gas sensor, a laser turbidity sensor and a sampling valve respectively installed on the other cover. The data terminals of the infrared temperature probe, pH electrode sensor, infrared gas sensor and laser turbidity sensor and the electronic control terminal of the exhaust valve are all connected to the central control unit.

[0010] As a preferred embodiment of the present invention, the motion generating system includes a servo motor mounted on a lifting frame and a reciprocating lead screw rotatably connected to the lifting frame. A torsion spring is provided at the rotatable connection between the reciprocating lead screw and the lifting frame. A key shaft is mounted on the output shaft of the servo motor, and a half-tooth gear is mounted on the key shaft. A pinion is mounted on the reciprocating lead screw, and the pinion meshes with the half-tooth gear. A motion adjusting seat is drivenly connected to the reciprocating lead screw, and the motion adjusting seat is slidably connected to the lifting frame. A truncated cone rotating body is rotatably mounted on the motion adjusting seat, and the truncated cone rotating body is linked with the key shaft. A guide frame is slidably mounted on the motion frame, and the guide frame is driven by friction with the truncated cone rotating body. A set of T-shaped guide rods is mounted on the guide frame, and each T-shaped guide rod is slidably connected to the motion frame. The T-shaped guide rods are horizontally positioned, and a preload spring is sleeved on the T-shaped guide rods at a position corresponding to the position between the motion frame and the guide frame. The motion frame is slidably connected to the lifting frame, and two return springs that are limited by the lifting frame are mounted on the bottom surface of the motion frame.

[0011] As a preferred technical solution of the present invention, the interior of the truncated cone rotating body is fixedly provided with a keyway that is open at both ends and slidably connected to the key shaft. The cross-section of the key shaft and the keyway is a regular hexagon. The radius of the semi-tooth gear is 7 to 9 times the radius of the pinion.

[0012] As a preferred technical solution of the present invention, both the truncated cone rotating body and the guide frame are fixedly provided with anti-slip knurled patterns. The central angle of the truncated cone rotating body is 180°, and the longitudinal cross-section of the truncated cone rotating body is an isosceles trapezoid. A reciprocating toothed plate is installed on the motion frame, and a reciprocating shaft is installed on the lifting frame. A large gear that meshes with the reciprocating toothed plate is installed on the reciprocating shaft. A tensioning seat is slidably installed on the motion frame, and a tensioning spring that is limited by the motion frame is installed on the side of the tensioning seat. A tensioning wheel is rotatably installed on the tensioning seat, and a central shaft is rotatably installed on the motion frame. A transmission belt is driven on the tensioning wheel. The central shaft and the reciprocating shaft are both connected to the transmission belt. Lateral bevel gears are installed on both the forward and reverse stirring shafts. An intermediate bevel gear is installed on the central shaft. Both lateral bevel gears are connected to the intermediate bevel gear, and the two lateral bevel gears are respectively located on both sides of the intermediate bevel gear.

[0013] As a preferred technical solution of the present invention, the motion frame is equipped with a permanent magnet and has multiple positioning slots. The quick-change bracket is made of iron and is equipped with multiple positioning blocks. Each positioning block engages with the positioning slot at the corresponding position. Both the positive and negative stirring shafts are equipped with transmission wheels, and both the outer and inner stirring rods are equipped with driven wheels. The surfaces of the transmission wheels and driven wheels are provided with transmission textures.

[0014] A stirring method for an automatic reagent stirring device used in chemical experiments includes the following steps: SS01, Reagent Titration and Identification: The linear drive module drives the liquid storage support to slide along the titration rack, so that the liquid storage tank is aligned with the dual-spectrum sensor in sequence. The central control unit controls the opening of the drip valve to release the reagent. The dual-spectrum sensor synchronously collects spectral data and transmits it to the central control unit for comparison with the characteristic peaks in the database to identify the reagent type. If it is an incorrect reagent, the drip valve is immediately closed and an audible and visual alarm is triggered. At the same time, the total titration volume is recorded to adjust the reagent mixing ratio. SS02, Reaction vessel fixing and sealing: Adjust the motor to drive the bidirectional lead screw to rotate, so that the connecting brackets on the forward and reverse thread sections drive the two caps to slide towards each other along the protective frame. The reaction vessel is clamped by the arc clamp plate. The height of the protective frame is adjusted by the lead screw lifting module so that the caps and the reaction vessel form a matching seal. The sealing gasket in the semi-through hole of the cap is in contact with the outer stirring rod. SS03, Start-up and linkage of the stirring assembly: The servo motor drives the key shaft to rotate, and the half-tooth gear meshes with the small gear on the reciprocating screw to drive the reciprocating screw to rotate, so that the motion adjustment seat slides along the lifting frame. At the same time, the truncated cone rotating body rotates with the key shaft and drives the guide frame through friction transmission. In conjunction with the T-shaped guide rod and the pre-tightening spring, the motion frame is driven to make vertical reciprocating motion, and its motion stroke and frequency change periodically according to the sine curve law. Simultaneously, the reciprocating tooth plate of the motion frame meshes with the large gear on the reciprocating shaft, and drives the central shaft to rotate through the transmission belt. The middle bevel gear on the central shaft drives the lateral bevel gears on the positive stirring shaft and the negative stirring shaft, so that the two rotate in opposite directions at the same speed. Then, through the transmission wheel and the driven wheel, the stirring paddles on the inner stirring rod and the outer stirring rod are driven to stir. SS04. Online monitoring and dynamic adjustment: The infrared temperature probe, pH electrode sensor, and laser turbidity sensor of the online monitoring system collect reaction data in real time and transmit it to the central control unit. The central control unit adjusts the stirring parameters according to the data and controls the exhaust valve to release pressure when the pressure exceeds the threshold.

[0015] Compared with the prior art, the present invention has the following advantages: 1. This invention overcomes the problem of low titration accuracy in traditional manual chemical titration methods by coordinating the liquid storage titration component with a dual-spectrum sensor and a central control unit. The linear drive module drives the liquid storage tank to align sequentially with the dual-spectrum sensor. During reagent titration, the dual-spectrum sensor collects near-infrared and Raman spectral data in real time and completes the comparison with the characteristic peaks in the database within 0.5 seconds to identify the reagent type. If the reagent is incorrect, the central control unit immediately closes the drip valve and triggers an audible and visual alarm, avoiding the risk of mis-dosing from the source. At the same time, the system automatically records the total titration volume and precisely controls the reagent mixing ratio through the central control unit, keeping the dosage error within ±0.1 ml. This linkage mechanism of spectral recognition, automatic cutoff, and closed-loop dosage control not only eliminates errors caused by visual errors and fatigue compared to traditional manual operation, but also achieves full traceability of reagent dispensing, greatly improving experimental safety and accuracy.

[0016] 2. This invention designs a coordinated linkage structure between the motion generation system and the stirring components. When the servo motor drives the key shaft to rotate, it drives the motion adjustment seat to slide through the half-tooth gear and the reciprocating screw. At the same time, the truncated cone rotating body and the guide frame are driven by friction, enabling the motion frame to achieve vertical reciprocating motion with adjustable stroke. The stroke and frequency change periodically according to a sine curve. Simultaneously, the reciprocating tooth plate of the motion frame meshes with the large gear of the reciprocating shaft, and drives the forward stirring shaft and the reverse stirring shaft to rotate in opposite directions at the same speed through the transmission belt and the central shaft bevel gear set. Finally, it drives the stirring paddles on the inner and outer stirring rods to form a three-dimensional composite stirring with vertical reciprocating and alternating forward and reverse rotation. The complex stirring trajectory generated by this multi-component linkage can effectively break the local stagnation zone of high-viscosity reagents and multiphase systems, improve the mixing uniformity compared with the traditional fixed mode, significantly shorten the reaction time, and improve the purity and stability of the product.

[0017] 3. This invention solves the problems of poor adaptability and insufficient stability of traditional fixing devices by using a linkage structure of protective frame, bidirectional screw, and cap. When the motor drives the bidirectional screw to rotate, the forward and reverse threaded sections drive the two caps to slide towards each other along the protective frame, so that the arc clamping plate can accurately clamp reaction vessels of different volumes and shapes. With the screw lifting module, the height of the protective frame can be adjusted, and the sealing gasket in the semi-through hole of the cap can dynamically fit with the outer stirring rod to form a seal. This linkage mechanism of bidirectional screw pitch adjustment, arc surface clamping, and height self-adaptation not only breaks through the limitations of single-specification clamping, but also ensures that the reaction vessel does not shake during stirring and vibration through the self-locking property of the screw, reducing the risk of tipping and providing a stable environment for subsequent monitoring and stirring.

[0018] 4. The online monitoring system of this invention forms a closed-loop linkage with the central control unit, which changes the lag of traditional manual sampling. The infrared temperature probe and sensor monitor the temperature at the center and edge of the reaction liquid respectively, while the pH electrode sensor and laser turbidity sensor simultaneously collect acidity and alkalinity data. All parameters are transmitted to the central control unit in real time. When the data deviates from the threshold, the central control unit immediately adjusts parameters such as stirring frequency and stroke. When the pressure exceeds the limit, the exhaust valve is automatically opened to release pressure. This linkage mode of real-time acquisition of multiple parameters, central algorithm analysis, and dynamic response of the actuator not only achieves full-process monitoring without blind spots compared with traditional manual detection, but also optimizes experimental conditions in real time through data feedback, avoids reaction runaway, and improves detection accuracy. At the same time, the sampling valve design can complete offline detection without interrupting the reaction, reducing system disturbance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an automatic stirring device for chemical experiments. Figure 2 This is a schematic diagram of the structure of a titration rack; Figure 3This is a structural diagram of the protective frame and the arc clamp. Figure 4 This is a structural diagram of the external stirring rod and quick-change bracket; Figure 5 This is a schematic diagram of the agitator. Figure 6 This is a structural diagram of the guide frame and the motion frame; Figure 7 for Figure 6 A magnified schematic diagram of the partial structure at point A in the middle; Figure 8 A schematic diagram of the lifting frame and the rotating truncated cone. Figure 9 This is a schematic diagram of the large gear.

[0020] The attached diagram lists the components represented by each number as follows: 1. Reaction vessel; 2. Titration rack; 3. Dual-spectrum sensor; 4. Protective frame; 5. Lifting frame; 6. Cover; 7. Arc clamp; 8. Motion frame; 9. Forward stirring shaft; 10. Reverse stirring shaft; 11. Quick-change bracket; 12. External stirring rod; 13. Internal stirring rod; 14. Stirring paddle; 15. Frame; 16. Screw lifting module; 17. Central control unit; 18. Linear transmission module; 19. Liquid storage bracket; 20. Liquid storage tank; 21. Support column; 22. Bidirectional screw; 23. Infrared temperature probe; 24. pH electrode sensor; 25. Exhaust valve; 26. Infrared... 27. Gas sensor; 28. Laser turbidity sensor; 29. ​​Sampling valve; 30. Servo motor; 31. Reciprocating lead screw; 32. Torsion spring; 33. Key shaft; 34. Half gear; 35. Pinion; 36. Motion adjustment seat; 37. Frustum rotating body; 38. Guide frame; 39. Preload spring; 40. Reciprocating shaft; 41. Reciprocating gear plate; 42. Large gear; 43. Tensioning seat; 44. Tensioning wheel; 45. Central shaft; 46. Positioning slot; 47. Permanent magnet; 48. Transmission wheel; 49. Driven wheel; 50. Return spring; 61. Tensioning spring. Detailed Implementation

[0021] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0022] The present invention provides the following preferred embodiments. like Figure 1-9 As shown, an automatic reagent stirring device for chemical experiments includes a reaction vessel 1, a titration rack 2 and a central control unit 17. The titration rack 2 is equipped with a repositionable liquid storage titration component and a dual-spectrum sensor 3. It also includes a liftable protective frame 4 and a lifting frame 5, with two adjustable-spaced covers 6 installed on the protective frame 4; It also includes a frame 15, on which two vertically arranged lead screw lifting modules 16 are installed. The two lead screw lifting modules 16 are respectively connected to the protective frame 4 and the lifting frame 5. The central control unit 17 is installed on the frame 15. The data terminal of the dual-spectrum sensor 3 is connected to the central control unit 17. The dual-spectrum sensor 3 includes a near-infrared spectral sensor and a Raman spectral sensor. The liquid storage titration assembly includes a linear drive module 18 mounted on the titration rack 2. A liquid storage support 19 is connected to the linear drive module 18. The liquid storage support 19 is slidably connected to the titration rack 2. Multiple liquid storage tanks 20 are mounted on the liquid storage support 19. A drip valve is connected to the bottom of the liquid storage tank 20. The electronic control terminal of the drip valve is connected to the central control unit 17. Both the liquid storage tank 20 and the reaction vessel 1 are made of high borosilicate glass. A support column 21 is mounted on the frame 15. A locking post that engages with the support column 21 is mounted on the titration rack 2. Each storage tank 20 is equipped with a chemical reagent to be reacted, and a drip valve is used to discharge the chemical reagent to be reacted at a constant flow rate. The linear drive module 18 drives the liquid storage support 19 to slide along the titration rack 2, so that multiple liquid storage tanks 20 are aligned with the dual-spectrum sensor 3 in sequence. When the reagent is titrated, the drip valve releases the reagent according to the instruction of the central control unit 17. The dual-spectrum sensor 3 simultaneously collects the near-infrared and Raman spectra of the dripped reagent and completes the comparison with the characteristic peaks in the database within 0.5 seconds to realize the identification of the reagent type. If an incorrect reagent is detected, the central control unit 17 immediately closes the drip valve and triggers an audible and visual alarm. The sensor also records the total titration volume in real time to adjust the reagent mixing ratio. This method solves the problems of reagent misaddition, large dosage deviation, and uncontrolled mixing ratio in traditional manual titration, and avoids experimental failure or dangerous reactions caused by human error. By combining real-time spectral identification with automated control, the error rate of reagent dosing and titration dosage error are reduced, while dynamic monitoring of the mixing ratio is achieved, which greatly improves the accuracy and safety of the experiment. A bidirectional lead screw 22 driven by an adjustable motor is rotatably mounted on the protective frame 4. The bidirectional lead screw 22 is symmetrically provided with a forward thread section and a reverse thread section. A connecting frame is driven to both the forward thread section and the reverse thread section. Both connecting frames are slidably connected to the protective frame 4 and are fixedly connected to the two covers 6 respectively. Adjust the motor to drive the bidirectional lead screw 22 to rotate. The forward thread section and the reverse thread section respectively drive the two connecting frames to slide towards or away from each other along the protective frame 4, thereby adjusting the distance between the two caps 6, so that the arc clamp 7 can accurately clamp the reaction tanks 1 of different specifications. The self-locking property of the lead screw drive ensures that there is no loosening after the distance is fixed. This solution solves the problem of shaking caused by the interaction between external forces and chemical reaction liquid in the reaction vessel 1 of the traditional device, avoids the interference of shaking on the accuracy of monitoring data and the potential risk of tipping, and provides a stable reaction environment for subsequent monitoring and stirring. An online monitoring system for monitoring chemical reaction data is installed between the two caps 6; Both caps 6 are equipped with arc clamps 7 that hold the reaction vessel 1. Arc-shaped clamping plate 7 has a polytetrafluoroethylene (PTFE) cushioning pad embedded inside; The online monitoring system includes an infrared temperature probe 23, a pH electrode sensor 24, and an exhaust valve 25 installed on one cover 6. An infrared gas sensor 26, a laser turbidity sensor 27, and a sampling valve 28 are installed on another cover 6. The data terminals of the infrared temperature probe 23, pH electrode sensor 24, infrared gas sensor 26, and laser turbidity sensor 27, as well as the electrical control terminal of the exhaust valve 25, are all connected to the central control unit 17. Infrared temperature probe 23 and infrared gas sensor 26 monitor the center temperature of the reaction liquid and the concentration of characteristic gases carbon dioxide and methane emitted during the reaction, respectively. pH electrode sensor 24 detects acidity and alkalinity in real time, and laser turbidity sensor 27 analyzes the turbidity of the system through the intensity of scattered light. All data are transmitted to the central control unit 17 in real time. If the temperature exceeds the threshold or the pressure inside the tank is too high, the exhaust valve 25 automatically opens to release pressure. The sampling valve 28 can extract a trace sample for offline detection without interrupting the reaction. This solution solves the problems of lagging reaction parameter monitoring, reaction runaway caused by the need for manual sampling, and discontinuous data in traditional experiments. A multi-dimensional real-time monitoring network is built through the online monitoring system to provide accurate data for judging the reaction process. The exhaust valve 25 can control the pressure inside the tank within a safe threshold. The design of the sampling valve 28 reduces the disturbance of the reaction system and improves the detection accuracy. A motion generating system is installed on the lifting frame 5. The motion generating system is connected to a motion frame 8 that can move vertically back and forth and a positive stirring shaft 9 that can rotate alternately forward and backward. The vertical motion stroke and motion frequency of the motion frame 8 change periodically according to a sine curve. The motion generation system includes a servo motor 29 mounted on the lifting frame 5 and a reciprocating lead screw 30 rotatably connected to the lifting frame 5. A torsion spring 31 is provided at the rotatable connection between the reciprocating lead screw 30 and the lifting frame 5. A key shaft 32 is mounted on the output shaft end of the servo motor 29. A half-tooth gear 33 is mounted on the key shaft 32. A pinion 34 is mounted on the reciprocating lead screw 30. The pinion 34 and the half-tooth gear 33 are engaged in transmission. The radius of the half-tooth gear 33 is 8 times the radius of the pinion 34; A motion adjustment seat 35 is connected to the reciprocating lead screw 30. The motion adjustment seat 35 is slidably connected to the lifting frame 5. A truncated cone rotating body 36 is rotatably mounted on the motion adjustment seat 35. The truncated cone rotating body 36 is linked with the key shaft 32. The interior of the truncated cone rotating body 36 is fixedly provided with a keyway that is open at both ends and slidably connected to the key shaft 32. The cross-sections of the key shaft 32 and the keyway are both regular hexagonal. A guide frame 37 is slidably mounted on the motion frame 8. The guide frame 37 is driven by friction with the truncated cone rotating body 36. A set of T-shaped guide rods are mounted on the guide frame 37. Each T-shaped guide rod is slidably connected to the motion frame 8. The T-shaped guide rods are set horizontally. A pre-tightening spring 38 is sleeved on the T-shaped guide rods at the position corresponding to the position between the motion frame 8 and the guide frame 37. The motion frame 8 is slidably connected to the lifting frame 5, and two return springs 49 that are limited by the lifting frame 5 are installed on the bottom surface of the motion frame 8. A counter-stirring shaft 10 is rotatably mounted on the forward stirring shaft 9. The counter-stirring shaft 10 is rotatably connected to the motion frame 8 through a bearing. The forward stirring shaft 9 and the counter-stirring shaft 10 rotate in opposite directions at the same speed. A quick-change bracket 11 is magnetically attached to the motion frame 8. An outer stirring rod 12 that is linked to the counter-stirring shaft 10 is rotatably mounted on the quick-change bracket 11. An inner stirring rod 13 that is linked to the forward stirring shaft 9 is rotatably mounted on the inner wall of the outer stirring rod 12. Multiple sets of stirring paddles 14 are mounted on both the outer stirring rod 12 and the inner stirring rod 13. Both the truncated cone rotating body 36 and the guide frame 37 are fixedly provided with anti-slip knurled patterns. The central angle of the truncated cone rotating body 36 is 180°. The longitudinal cross section of the truncated cone rotating body 36 is an isosceles trapezoid. The moving frame 8 is equipped with a reciprocating toothed plate 40. The lifting frame 5 is equipped with a reciprocating shaft 39. The reciprocating shaft 39 is equipped with a large gear 41 that meshes with the reciprocating toothed plate 40. A tensioning seat 42 is slidably mounted on the motion frame 8. A tensioning spring 50, which is limited by the motion frame 8, is mounted on the side of the tensioning seat 42. A tensioning wheel 43 is rotatably mounted on the tensioning seat 42. A central shaft 44 is rotatably mounted on the motion frame 8. A transmission belt is driven on the tensioning wheel 43. The central shaft 44 and the reciprocating shaft 39 are both connected to the transmission belt. Lateral bevel gears are mounted on the forward stirring shaft 9 and the reverse stirring shaft 10. An intermediate bevel gear is mounted on the central shaft 44. Both lateral bevel gears are connected to the intermediate bevel gear. The two lateral bevel gears are respectively located on both sides of the intermediate bevel gear. Servo motor 29 drives key shaft 32 to rotate. When half gear 33 meshes with pinion 34, it drives reciprocating screw 30 to rotate, causing motion adjustment seat 35 to slide along lifting frame 5. At the same time, truncated cone rotating body 36 rotates with key shaft 32. Through friction transmission, it drives guide frame 37. With T-shaped guide rod and pre-tightening spring 38, motion frame 8 achieves vertical reciprocating motion with adjustable stroke of 0-100mm. Reciprocating tooth plate 40 meshes with large gear 41 on reciprocating shaft 39. Through transmission belt, it drives central shaft 44. Central bevel gear drives lateral bevel gears on both sides, realizing that forward stirring shaft 9 and reverse stirring shaft 10 rotate in opposite directions at the same speed. Finally, it drives stirring paddle 14 to form three-dimensional stirring. This solution solves the problem of uneven mixing of high-viscosity reagents and low reaction efficiency caused by the single direction and fixed rate of traditional stirring devices. This device achieves vertical reciprocating and alternating forward and reverse mixing motion through mechanical structure linkage, thereby improving the mixing uniformity. When the motion frame 8 moves vertically back and forth, it drives the reciprocating gear plate 40 to move up and down. After the reciprocating gear plate 40 moves up and down, due to the meshing motion between the large gear 41 of the reciprocating shaft 39 and the reciprocating gear plate 40, the reciprocating shaft 39 is driven to rotate in both directions. After the reciprocating shaft 39 rotates in both directions, the alternating forward and reverse rotation of the forward stirring shaft 9 is realized. The axial position of the cover 6 is fixedly provided with a semi-through hole that is compatible with the outer stirring rod 12, and a sealing gasket is installed on the inner wall of the semi-through hole. The motion frame 8 is equipped with a permanent magnet 46 and has multiple positioning slots 45. The quick-change bracket 11 is made of iron and has multiple positioning blocks installed on it. Each positioning block engages with the corresponding positioning slot 45. The positive stirring shaft 9 and the negative stirring shaft 10 are equipped with drive wheels 47. The outer stirring rod 12 and the inner stirring rod 13 are equipped with driven wheels 48. The surfaces of the drive wheels 47 and the driven wheels 48 are provided with transmission patterns.

[0023] When the outer stirring rod 12 passes through the semi-through holes of the two caps 6, the sealing gasket maintains dynamic sealing as the stirring rod moves. The quick-change bracket 11 engages with the positioning slot 45 of the motion frame 8 through the positioning block, and is magnetically fixed with the permanent magnet 46. The transmission wheel 47 and the driven wheel 48 are engaged by the grooves to achieve power transmission. When disassembling, the quick-change bracket 11 can be quickly removed by separating the magnetic attraction and pulling out the positioning block, which is convenient for cleaning or replacing the stirring paddle 14. A stirring method for an automatic reagent stirring device used in chemical experiments includes the following steps: SS01, Reagent Titration and Identification: The linear drive module 18 drives the liquid storage support 19 to slide along the titration rack 2, so that the liquid storage tank 20 is aligned with the dual-spectrum sensor 3 in sequence. The central control unit 17 controls the drip valve to open and release the reagent. The dual-spectrum sensor 3 synchronously collects spectral data and transmits it to the central control unit 17 for comparison with the characteristic peaks in the database to identify the reagent type. If it is an incorrect reagent, the drip valve is immediately closed and an audible and visual alarm is triggered. At the same time, the total titration volume is recorded to adjust the reagent mixing ratio. SS02, Fixing and Sealing of Reaction Vessel 1: Adjust the motor to drive the bidirectional lead screw 22 to rotate, so that the connecting brackets on the forward and reverse thread sections drive the two caps 6 to slide towards each other along the protective frame 4, and clamp the reaction vessel 1 through the arc clamp plate 7. The height of the protective frame 4 is adjusted by the lead screw lifting module 16 so that the caps 6 and the reaction vessel 1 form a matching seal, and the sealing gasket in the semi-through hole of the cap 6 is in contact with the outer stirring rod 12; SS03, Start-up and linkage of the stirring assembly: Servo motor 29 drives key shaft 32 to rotate, half gear 33 meshes with small gear 34 on reciprocating screw 30 to drive reciprocating screw 30 to rotate, causing motion adjustment seat 35 to slide along lifting frame 5. At the same time, truncated cone rotating body 36 rotates with key shaft 32 and drives guide frame 37 through friction transmission. In conjunction with T-shaped guide rod and pre-tightening spring 38, it drives motion frame 8 to perform vertical reciprocating motion. Its motion stroke and frequency change periodically according to sine curve law. Synchronously, reciprocating tooth plate 40 of motion frame 8 meshes with large gear 41 on reciprocating shaft 39, and drives central shaft 44 to rotate through transmission belt. The middle bevel gear on central shaft 44 drives the lateral bevel gear on positive stirring shaft 9 and negative stirring shaft 10 to rotate in opposite directions at the same speed. Then, through transmission wheel 47 and driven wheel 48, it drives stirring paddle 14 on inner stirring rod 13 and outer stirring rod 12 to stir. SS04. Online monitoring and dynamic adjustment: The infrared temperature probe 23, pH electrode sensor 24, and laser turbidity sensor 27 of the online monitoring system collect reaction data in real time and transmit it to the central control unit 17. The central control unit 17 adjusts the stirring parameters according to the data and controls the exhaust valve 25 to release pressure when the pressure exceeds the threshold.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic reagent stirring device for chemical experiments, comprising a reaction vessel (1), a titrator (2), and a central control unit (17), characterized in that: The titration rack (2) is equipped with a repositionable liquid storage titration component, and a dual-spectrum sensor (3) is installed on the titration rack (2). The data terminal of the dual-spectrum sensor (3) is connected to the central control unit (17). It also includes a liftable protective frame (4) and a lifting frame (5). The protective frame (4) is equipped with two adjustable-spaced covers (6). An online monitoring system for monitoring chemical liquid reaction data is provided between the two covers (6). Arc clamps (7) are installed on both covers (6). A motion generating system is installed on the lifting frame (5). The motion generating system is connected to a vertically reciprocating motion frame (8) and a forward stirring shaft (9) that can rotate alternately in both directions. The vertical motion stroke and motion frequency of the motion frame (8) change periodically according to a sine curve. The positive stirring shaft (9) is rotatably fitted with a negative stirring shaft (10). The negative stirring shaft (10) is rotatably connected to the motion frame (8) through a bearing. The positive stirring shaft (9) and the negative stirring shaft (10) rotate in opposite directions at the same speed. The motion frame (8) is magnetically attached with a quick-change bracket (11). The quick-change bracket (11) is rotatably mounted with an outer stirring rod (12) that is linked to the negative stirring shaft (10). The inner wall of the outer stirring rod (12) is rotatably mounted with an inner stirring rod (13) that is linked to the positive stirring shaft (9). Multiple sets of stirring paddles (14) are mounted on both the outer stirring rod (12) and the inner stirring rod (13).

2. The automatic stirring device for chemical experimental reagents according to claim 1, characterized in that: It also includes a frame (15), on which two vertically arranged lead screw lifting modules (16) are installed. The two lead screw lifting modules (16) are respectively connected to the protective frame (4) and the lifting frame (5). The central control unit (17) is installed on the frame (15). The dual-spectrum sensor (3) includes a near-infrared spectral sensor and a Raman spectral sensor.

3. The automatic stirring device for chemical experimental reagents according to claim 2, characterized in that: The liquid storage titration assembly includes a linear drive module (18) mounted on the titration rack (2), a liquid storage support (19) is connected to the linear drive module (18), the liquid storage support (19) is slidably connected to the titration rack (2), a plurality of liquid storage tanks (20) are mounted on the liquid storage support (19), a drip valve is connected to the bottom of the liquid storage tank (20), the electrical control terminal of the drip valve is connected to the central control unit (17), the liquid storage tank (20) and the reaction tank (1) are both made of high borosilicate glass, a support column (21) is mounted on the frame (15), and a locking pin that engages with the support column (21) is mounted on the titration rack (2).

4. The automatic stirring device for chemical experimental reagents according to claim 3, characterized in that: The protective frame (4) is rotatably mounted with a bidirectional lead screw (22) driven by an adjusting motor. The bidirectional lead screw (22) is symmetrically provided with a forward thread section and a reverse thread section. Both the forward thread section and the reverse thread section are connected to a connecting frame. Both connecting frames are slidably connected to the protective frame (4). The two connecting frames are fixedly connected to two caps (6). The axial position of the cap (6) is fixedly provided with a semi-through hole adapted to the external stirring rod (12). A sealing gasket is installed on the inner wall of the semi-through hole.

5. The automatic stirring device for chemical experimental reagents according to claim 1, characterized in that: The online monitoring system includes an infrared temperature probe (23), a pH electrode sensor (24), and an exhaust valve (25) installed on one cover (6). An infrared gas sensor (26), a laser turbidity sensor (27), and a sampling valve (28) are installed on the other cover (6). The data terminals of the infrared temperature probe (23), pH electrode sensor (24), infrared gas sensor (26), and laser turbidity sensor (27), as well as the electrical control terminal of the exhaust valve (25), are all connected to the central control unit (17).

6. The automatic stirring device for chemical experimental reagents according to claim 1, characterized in that: The motion generating system includes a servo motor (29) mounted on the lifting frame (5) and a reciprocating screw (30) rotatably connected to the lifting frame (5). A torsion spring (31) is provided at the rotatable connection between the reciprocating screw (30) and the lifting frame (5). A key shaft (32) is mounted on the output shaft end of the servo motor (29). A half-tooth gear (33) is mounted on the key shaft (32). A pinion (34) is mounted on the reciprocating screw (30). The pinion (34) meshes with the half-tooth gear (33). A motion adjusting seat (35) is slidably connected to the reciprocating screw (30). 5) A truncated cone rotating body (36) is rotatably mounted on the upper part. The truncated cone rotating body (36) is linked with the key shaft (32). A guide frame (37) is slidably mounted on the motion frame (8). The guide frame (37) and the truncated cone rotating body (36) are driven by friction. A set of T-shaped guide rods are mounted on the guide frame (37). Each T-shaped guide rod is slidably connected to the motion frame (8). The T-shaped guide rods are horizontally set. A pre-tightening spring (38) is sleeved on the T-shaped guide rods at the position corresponding to the position between the motion frame (8) and the guide frame (37). The motion frame (8) is slidably connected to the lifting frame (5). Two reset springs (49) that are limited by the lifting frame (5) are installed on the bottom surface of the motion frame (8).

7. The automatic stirring device for chemical experimental reagents according to claim 6, characterized in that: The interior of the truncated cone rotating body (36) is fixedly provided with a keyway that is open at both ends and slidably connected to the key shaft (32). The cross-sections of the key shaft (32) and the keyway are both regular hexagonal. The radius of the semi-tooth gear (33) is 7 to 9 times the radius of the pinion (34).

8. The automatic stirring device for chemical experimental reagents according to claim 6, characterized in that: Both the truncated cone rotating body (36) and the guide frame (37) are fixedly provided with anti-slip knurled patterns. The central angle of the truncated cone rotating body (36) is 180°. The longitudinal cross-section of the truncated cone rotating body (36) is an isosceles trapezoid. A reciprocating gear plate (40) is installed on the motion frame (8). A reciprocating shaft (39) is installed on the lifting frame (5). A large gear (41) that meshes with the reciprocating gear plate (40) is installed on the reciprocating shaft (39). A tensioning seat (42) is slidably installed on the motion frame (8). A tensioning seat (42) is installed on the side of the tensioning seat (42). The tension spring (50) is limited by the motion frame (8). The tensioning seat (42) is rotatably mounted with a tensioning wheel (43). The motion frame (8) is rotatably mounted with a central shaft (44). The tensioning wheel (43) is driven by a transmission belt. The central shaft (44) and the reciprocating shaft (39) are both connected to the transmission belt. The positive stirring shaft (9) and the negative stirring shaft (10) are both mounted with lateral bevel gears. The central shaft (44) is mounted with an intermediate bevel gear. The two lateral bevel gears are connected to the intermediate bevel gear. The two lateral bevel gears are respectively located on both sides of the intermediate bevel gear.

9. The automatic stirring device for chemical experimental reagents according to claim 1, characterized in that: The motion frame (8) is equipped with a permanent magnet (46) and has multiple positioning slots (45). The quick-change bracket (11) is made of iron and has multiple positioning blocks installed on it. Each positioning block engages with the corresponding positioning slot (45). The positive stirring shaft (9) and the negative stirring shaft (10) are equipped with transmission wheels (47). The outer stirring rod (12) and the inner stirring rod (13) are equipped with driven wheels (48). The surfaces of the transmission wheels (47) and the driven wheels (48) are provided with transmission patterns.

10. A stirring method for an automatic reagent stirring device used in chemical experiments, characterized in that, Includes the following steps: SS01, Reagent Titration and Identification: The linear drive module (18) drives the liquid storage support (19) to slide along the titration rack (2), so that the liquid storage tank (20) is aligned with the dual-spectrum sensor (3) in sequence. The central control unit (17) controls the drip valve to open and release the reagent. The dual-spectrum sensor (3) synchronously collects spectral data and transmits it to the central control unit (17) to compare with the characteristic peaks in the database to identify the reagent type. If it is an incorrect reagent, the drip valve is immediately closed and an audible and visual alarm is triggered. At the same time, the total titration volume is recorded to adjust the reagent mixing ratio. SS02, Fixing and sealing of reaction vessel (1): Adjust the motor to drive the bidirectional lead screw (22) to rotate, so that the connecting frame on the positive thread section and the negative thread section drives the two caps (6) to slide towards each other along the protective frame (4), and clamp the reaction vessel (1) through the arc clamp plate (7). The height of the protective frame (4) is adjusted by the lead screw lifting module (16) so that the caps (6) and the reaction vessel (1) form a matching seal, and the sealing gasket in the semi-through hole of the cap (6) fits with the outer stirring rod (12); SS03, Start-up and linkage of the stirring assembly: The servo motor (29) drives the key shaft (32) to rotate, and the half-tooth gear (33) meshes with the small gear (34) on the reciprocating screw (30) to drive the reciprocating screw (30) to rotate, so that the motion adjustment seat (35) slides along the lifting frame (5). At the same time, the truncated cone rotating body (36) rotates with the key shaft (32) and drives the guide frame (37) through friction transmission. In conjunction with the T-shaped guide rod and the pre-tightening spring (38), it drives the motion frame (8) to make vertical reciprocating motion, and its motion path is... The process and frequency change periodically according to the sine curve law. Simultaneously, the reciprocating tooth plate (40) of the motion frame (8) meshes with the large gear (41) on the reciprocating shaft (39), and drives the central shaft (44) to rotate via the transmission belt. The intermediate bevel gear on the central shaft (44) drives the lateral bevel gear on the positive stirring shaft (9) and the negative stirring shaft (10) to rotate in opposite directions at the same speed. Then, through the transmission wheel (47) and the driven wheel (48), the inner stirring rod (13) and the stirring paddle (14) on the outer stirring rod (12) are driven to stir. SS04. Online monitoring and dynamic adjustment: The infrared temperature probe (23), pH electrode sensor (24), and laser turbidity sensor (27) of the online monitoring system collect reaction data in real time and transmit it to the central control unit (17). The central control unit (17) adjusts the stirring parameters according to the data and controls the exhaust valve (25) to release pressure when the pressure exceeds the threshold.

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