Material stirring device for analytical chemistry

Abstract

The utility model belongs to the technical field of stirring equipment, and particularly relates to a material stirring device for analytical chemistry, which comprises a rack, a mixing mechanism, a stirring mechanism and a feeding mechanism, the stirring mechanism comprises a stirring tank, a second driving motor, a stirring assembly and an auxiliary stirring assembly, the stirring assembly is rotatably mounted in the stirring tank, and the feeding mechanism is mounted in the stirring tank. The auxiliary stirring assembly is installed on the stirring assembly, the feeding mechanism is fixedly installed on the stirring mechanism, and the feeding mechanism is connected with the auxiliary stirring assembly. The arc-shaped blades of the stirring mechanism are matched with the inner wall of the stirring tank, so that materials can move in the horizontal and vertical directions in the stirring tank, and the problem that the materials in a container have obvious concentration gradient due to the fact that the materials can only form weak stirring flow in a local area is effectively solved while the materials are mixed; and meanwhile, the auxiliary stirring assembly can form bubbles in the materials by spraying high-pressure inert gas on the arc-shaped blades, so that the stirring effect of the materials is further improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to stirring equipment technical field, concretely relates to a material stirring device for analytical chemistry. BACKGROUND

[0002] In the field of analytical chemistry, uniform mixing of materials is crucial for obtaining accurate experimental results. Whether it is the determination of components in a solution, the conduct of chemical reactions, or the pretreatment of samples, various materials (such as reagents, samples, etc.) need to be thoroughly stirred and mixed. Currently, common material stirring devices in analytical chemistry laboratories include magnetic stirrers and mechanical stirrers. A magnetic stirrer drives a magnetic stirring rod to rotate in a container through a magnetic field, thereby mixing the materials. A mechanical stirrer uses a motor to drive a stirring paddle to rotate in the materials to achieve stirring. Mechanical stirrers have the advantages of strong stirring power and adjustable stirring range, and they can handle a variety of materials, from low-viscosity solutions to high-viscosity gels, and from homogeneous systems to heterogeneous systems (such as liquid-liquid and liquid-solid systems), so they are widely used.

[0003] In practical applications, the existing mechanical stirring device has the problem of uneven stirring. Especially when dealing with materials with high viscosity, only weak stirring flow can be formed in the local area of high-viscosity materials, resulting in a significant concentration gradient of materials in the container. This uneven stirring can cause deviations in experimental results, and uneven mixing of materials may make the sample taken not represent the composition of the whole material, resulting in incorrect analysis data.

[0004] Therefore, it is necessary to study a material stirring device for analytical chemistry that can fully stir the materials to prevent a significant concentration gradient of materials in the container. SUMMARY

[0005] In view of the above deficiencies in the prior art, the present utility model provides a material stirring device for analytical chemistry to solve the problem of uneven stirring of existing mechanical stirring equipment, which can only form weak stirring flow in the local area of materials, resulting in a significant concentration gradient of materials in the container.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A material stirring device for analytical chemistry, comprising: a rack, a mixing mechanism, a stirring mechanism, and a feeding mechanism;

[0008] The rack comprises a connecting bracket and a supporting bracket, the supporting bracket is fixedly arranged at the bottom of the stirring mechanism, and the stirring mechanism is fixedly connected with the mixing mechanism through the connecting bracket;

[0009] The mixing mechanism is connected with the stirring mechanism;

[0010] The stirring mechanism comprises a stirring tank, a second driving motor, a stirring assembly and an auxiliary stirring assembly, the stirring tank is a hollow tank body with open ends, the stirring tank further comprises a first connecting flange and a second connecting flange, the first connecting flange is fixedly connected at the upper end opening of the stirring tank, the second connecting flange is fixedly connected at the lower end opening of the stirring tank, the lower end of the first connecting flange is provided with an arc-shaped protrusion, the stirring assembly is rotatably installed on the first connecting flange and the second connecting flange, the auxiliary stirring assembly is installed on the stirring assembly, and the auxiliary stirring assembly is connected with the gas supply device.

[0011] The feeding mechanism is fixedly installed on the stirring mechanism, and the feeding mechanism is connected with the auxiliary stirring assembly.

[0012] Further, the mixing mechanism comprises a mixing tank, a first driving motor and a stirring rod, the mixing tank comprises a first discharge port and a motor support, the mixing tank is a tank body with an upper end opening, the first discharge port is arranged at the lower end of the mixing tank, and the motor support is fixedly arranged at the upper end opening of the mixing tank; the first driving motor is fixedly installed on the motor support, and the stirring rod is rotatably arranged in the mixing tank and connected with the first driving motor.

[0013] Further, the stirring tank is further provided with a feeding pipe, a second discharge port and a one-way exhaust valve, the feeding pipe is fixedly provided with a feeding pipe at the upper end, the feeding pipe is connected with the first discharge port of the mixing tank, the feeding pipe is provided with a valve, and the one-way exhaust valve is arranged at the upper end of the stirring tank.

[0014] Further, the stirring assembly comprises a rotating shaft, a transmission gear, a connecting rod and an arc-shaped paddle, the rotating shaft is provided with a through hole, the upper end of the rotating shaft extends to the outside of the stirring tank through the first connecting flange, the rotating shaft is rotatably matched with the first connecting flange and the second connecting flange, the arc-shaped paddle is fixedly connected to the rotating shaft through the connecting rod, the transmission gear is fixedly arranged at the upper end of the rotating shaft, and the transmission gear is engaged with the second driving motor.

[0015] Further, the arc-shaped paddle comprises a first paddle surface and a second paddle surface, the upper and lower ends of the arc-shaped paddle are curved towards the rotating shaft, the connecting end of the first paddle surface and the second paddle surface is located in front of the rotating direction of the arc-shaped paddle, and the first paddle surface and the second paddle surface form a cavity.

[0016] Further, the second paddle surface is an arc surface, and the arc shape of the second paddle surface is matched with the rotating track of the arc-shaped paddle.

[0017] Further, the first paddle surface is an arc surface, and the end of the first paddle surface, which is not connected with the second paddle surface, is curved towards the rotating shaft.

[0018] Still further, lower ends of the first and second paddles are curved forward in the direction of rotation of the arc-shaped paddle, and upper ends of the first and second paddles are curved backward in the direction of rotation of the arc-shaped paddle.

[0019] Still further, the auxiliary stirring assembly comprises a first control valve, a rotary joint, a distribution valve block and a gas-liquid two-phase atomizing nozzle, the first control valve is fixedly connected to the stirring tank, the first control valve is provided with an air inlet, a liquid inlet and an outlet, the rotary joint is installed on the rotating shaft, the distribution valve block is fixedly installed on the inner wall of the middle hole of the rotating shaft, the outlet of the first control valve is connected with the distribution valve block through the rotary joint and a pipeline, the gas-liquid two-phase atomizing nozzle is fixedly installed in the cavity, the distribution valve block is connected with the gas-liquid two-phase atomizing nozzle through a pipeline, the air inlet of the first control valve is connected with a gas supply device through a pipeline, and the liquid inlet of the first control valve is connected with the feeding mechanism through a pipeline.

[0020] Still further, the feeding mechanism comprises a mixed water tank, a liquid changing port, a liquid supply pump, a liquid storage tank and a second control valve, the mixed water tank is fixedly connected to the upper end of the stirring tank, the mixed water tank is connected with the liquid inlet of the first control valve through the liquid supply pump and a pipeline, the liquid storage tank and the second control valve are sequentially arranged on the pipeline between the rotary joint and the distribution valve block, the liquid storage tank is fixedly connected with the inner wall of the middle hole of the rotating shaft, and the second control valve is fixedly connected with the lower end of the liquid storage tank.

[0021] Compared with the prior art, the utility model has the advantages of the following beneficial effects:

[0022] 1、The utility model discloses a material stirring device for analytical chemistry, through the cooperation of the arc-shaped paddle of the stirring mechanism and the inner wall of the stirring tank, the material can move in the horizontal and vertical directions in the stirring tank, while mixing the material, the problem that the material can only form weak stirring flow in the local area and cause the obvious concentration gradient of the material in the container is effectively prevented, and the auxiliary stirring assembly can spray high-pressure inert gas on the arc-shaped paddle to form bubbles in the material, thereby further improving the stirring effect of the material.

[0023] 2、The utility model discloses a material stirring device for analytical chemistry, the equipment has a feeding mechanism, and the material can be added to the stirring tank through high-pressure inert gas to speed up the stirring and mixing of the material. DRAWINGS

[0024] Figure 1 It is the structure diagram of the utility model Figure 1 ;

[0025] Figure 2 It is the structure diagram of the utility model Figure 2 ;

[0026] Figure 3 is a structural schematic view of the mixing mechanism;

[0027] Figure 4 is a structural schematic view of the stirring mechanism and the feeding mechanism;

[0028] Figure 5 is a vertical sectional view of the stirring mechanism;

[0029] Figure 6 is a horizontal sectional view of the stirring mechanism;

[0030] Figure 7 is a structural schematic view of the stirring mechanism;

[0031] Figure 8 is a structural schematic view of the stirring mechanism; Figure 5 is an enlarged structural schematic view at A in the middle.

[0032] The reference signs involved in the drawings are as follows:

[0033] 1, frame; 11, connecting support; 12, supporting support; 2, mixing mechanism; 21, mixing tank; 211, first discharge port; 212, motor support; 22, first driving motor; 23, stirring rod; 3, stirring mechanism; 31, stirring tank; 311, feeding pipe; 312, valve; 313, second discharge port; 314, first connecting flange; 315, arc-shaped protrusion; 316, second connecting flange; 317, one-way exhaust valve; 32, second driving motor; 33, stirring assembly; 331, rotating shaft; 332, transmission gear; 333, connecting rod; 334, arc-shaped paddle; 335, first paddle surface; 336, second paddle surface; 337, cavity; 34, auxiliary stirring assembly; 341, first control valve; 342, rotary joint; 343, distribution valve block; 344, gas-liquid two-phase atomizing nozzle; 4, feeding mechanism; 41, mixed water tank; 42, liquid supply pump; 43, liquid storage tank; 431, second control valve. DETAILED DESCRIPTION

[0034] In order for those skilled in the art to better understand the present application, the technical solutions of the present application are further described below in combination with the drawings and examples.

[0035] In the description of the present application, it should be noted that for orientation words, such as the terms "center", "transverse", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the present application.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0037] Please refer to Figures 1 to 8 As shown in the drawings, a material stirring device for analytical chemistry comprises a rack 1 for support, a mixing mechanism 2 for preliminary mixing of materials, a stirring mechanism 3 for thorough mixing of materials, and a feeding mechanism 4 for supplementing materials.

[0038] The rack 1 comprises a connecting bracket 11 and a supporting bracket 12. The supporting bracket 12 is fixedly arranged at the bottom of the stirring mechanism 3, and the stirring mechanism 3 is fixedly connected with the mixing mechanism 2 through the connecting bracket 11, that is, the connecting bracket 11 is used to connect the mixing tank 21 and the stirring tank 31, and the supporting bracket 12 is used to support the whole device.

[0039] The mixing mechanism 2 is connected with the stirring mechanism 3. Specifically, the mixing mechanism 2 comprises a mixing tank 21, a first driving motor 22, and a stirring rod 23. The mixing tank 21 comprises a first discharge port 211 and a motor bracket 212. The mixing tank 21 is a tank body with an upper opening. The first discharge port 211 is arranged at the lower end of the mixing tank 21. The motor bracket 212 is fixedly arranged at the upper opening of the mixing tank 21. The first driving motor 22 is fixedly mounted on the motor bracket 212. The stirring rod 23 is rotatably arranged in the mixing tank 21. The stirring rod 23 is connected with the first driving motor 22. It can be understood that after a plurality of materials are poured into the mixing tank 21 through the upper opening of the mixing tank 21, the first driving motor 22 drives the stirring rod 23 to complete the preliminary stirring and mixing in the mixing tank 21, and then the materials are discharged through the first discharge port 211 and enter the stirring mechanism 3.

[0040] The stirring mechanism 3 comprises a stirring tank 31, a second driving motor 32, a stirring assembly 33 and an auxiliary stirring assembly 34. The stirring tank 31 is a hollow tank body with both ends open. The stirring tank 31 further comprises a first connecting flange 314 and a second connecting flange 316. The first connecting flange 314 is fixedly connected at the upper end opening of the stirring tank 31. The second connecting flange 316 is fixedly connected at the lower end opening of the stirring tank 31. The lower end of the first connecting flange 314 is provided with an arc-shaped protrusion 315. It can be understood that, when the material moves upward through the gap between the rotating shaft 331 and the first paddle surface 335 under the stirring of the arc-shaped paddle 334, it can move to both sides under the guidance of the arc-shaped protrusion 315, preventing some of the material from staying there. The stirring assembly 33 is rotatably installed on the first connecting flange 314 and the second connecting flange 316.

[0041] The stirring tank 31 is further provided with a feeding pipe 311, a second discharge port 313 and a one-way exhaust valve 317. The upper end of the feeding pipe 311 is fixedly provided with a feeding pipe 311. The feeding pipe 311 is connected with the first discharge port 211 of the mixing tank 21. The feeding pipe 311 is provided with a valve 312. The material mixed by the mixing mechanism 2 enters the stirring tank 31 through the feeding pipe 311 and the valve 312. The one-way exhaust valve 317 is arranged at the upper end of the stirring tank 31. The one-way exhaust valve 317 can exhaust the gas inside, but the gas connected from outside cannot enter the stirring tank 31 through the one-way exhaust valve 317. This part of the technical scheme is prior art, which will not be described here. The material after stirring is discharged through the second discharge port 313.

[0042] Specifically, the stirring assembly 33 comprises a rotating shaft 331, a transmission gear 332, a connecting rod 333 and an arc-shaped paddle 334. The rotating shaft 331 is provided with a through hole. The upper end of the rotating shaft 331 extends to the outside of the stirring tank 31 through the first connecting flange 314. The rotating shaft 331 is rotatably connected with the first connecting flange 314 and the second connecting flange 316. The transmission gear 332 is fixedly arranged at the upper end of the rotating shaft 331. The transmission gear 332 is engaged with the second driving motor 32. It can be understood that the second driving motor 32 can drive the rotating shaft 331 and other components installed on the rotating shaft 331 to rotate in the stirring tank 31.

[0043] The arc-shaped paddle 334 is fixedly connected to the rotating shaft 331 through the connecting rod 333. Specifically, the arc-shaped paddle 334 comprises a first paddle surface 335 and a second paddle surface 336, the connecting ends of the first paddle surface 335 and the second paddle surface 336 are located in front of the rotating direction of the arc-shaped paddle 334, and a cavity 337 is formed between the first paddle surface 335 and the second paddle surface 336. The upper and lower ends of the arc-shaped paddle 334 are curved towards the rotating shaft 331. Correspondingly, the upper and lower ends of the first paddle surface 335 and the second paddle surface 336 are curved towards the rotating shaft 331. Correspondingly, the connecting portions between the upper and lower end faces and the side walls of the stirring tank 31 are provided with arc faces matched with the arc-shaped paddle 334. It can be understood that the arc faces can be matched with the arc face of the second paddle surface 336 to control the distance between the two gaps, so that the materials can move in the gap, prevent some materials from staying in a certain place or moving at low speed, and affect the stirring effect.

[0044] Correspondingly, the first paddle surface 335 is an arc face, and the end of the first paddle surface 335 not connected to the second paddle surface 336 is curved towards the rotating shaft 331. It can be understood that when the arc-shaped paddle 334 rotates under the driving of the rotating shaft 331, the first paddle surface 335 can move towards the rotating shaft 331 while pushing the materials between the rotating shaft 331 and the first paddle surface 335 to move forward. The second paddle surface 336 is an arc face, and the arc direction of the second paddle surface 336 matches the rotating track of the arc-shaped paddle 334, so as to prevent the materials between the second paddle surface 336 and the stirring tank 31 from being squeezed by the arc-shaped paddle 334 when the arc-shaped paddle 334 rotates to stir the materials, so as to prevent the materials from flowing back quickly behind the arc-shaped paddle 334, affect the effect of the arc-shaped paddle 334 on the materials, and affect the size of the cavity formed in the rear materials. It can be understood that under the action of the first paddle surface 335 and the second paddle surface 336, when the arc-shaped paddle 334 rotates under the driving of the rotating shaft 331, the materials are pushed to rotate horizontally for mixing, and at the same time, the materials are cut to form a material cavity behind the arc-shaped paddle 334, the material cavity is communicated with the cavity 337 for assisting the stirring assembly 34 and the feeding mechanism 4, so as to further strengthen the stirring effect and adjust the proportion of each material during the stirring process.

[0045] Correspondingly, characterized in that: the lower end of the first paddle surface 335 and the second paddle surface 336 is curved to the front of the rotating direction of the arc-shaped paddle 334, and the upper end of the first paddle surface 335 and the second paddle surface 336 is curved to the rear of the rotating direction of the arc-shaped paddle 334. It can be understood that when the arc-shaped paddle 334 is driven to rotate by the rotating shaft 331, it can push the material between the rotating shaft 331 and the first paddle surface 335 to move upward, contact the arc-shaped protrusion 315 on the first connecting flange 314, and then be guided into the gap between the inner wall of the stirring tank 31 and the second paddle surface 336. Under the action of gravity, it moves downward, so that the arc-shaped paddle 334 not only pushes the material to rotate horizontally in the stirring tank 31, but also makes it circulate in the gap between the rotating shaft 331 and the first paddle surface 335 and the gap between the second paddle surface 336 and the inner wall of the stirring tank 31, effectively improving the efficiency of material mixing and stirring, and preventing some materials from not moving or moving slowly. At the same time, since the upper end of the first paddle surface 335 and the second paddle surface 336 is curved to the rear of the rotating direction of the arc-shaped paddle 334, the downward moving material cannot directly fall from the top of the material cavity, and the material cavity can be prevented from being filled with downward moving material.

[0046] The auxiliary stirring assembly 34 is installed on the stirring assembly 33, and the auxiliary stirring assembly 34 is connected with a gas supply device. Specifically, the auxiliary stirring assembly 34 includes a first control valve 341, a rotating joint 342, a distribution valve block 343, and a gas-liquid two-phase atomizing nozzle 344. The first control valve 341 is fixedly connected to the stirring tank 31, and the first control valve 341 is provided with an air inlet, a liquid inlet, and an outlet. The rotating joint 342 is installed on the rotating shaft 331, and the distribution valve block 343 is fixedly installed on the inner wall of the middle hole of the rotating shaft 331. The outlet of the first control valve 341 is connected with the distribution valve block 343 through the rotating joint 342 and a pipeline. The gas-liquid two-phase atomizing nozzle 344 is fixedly installed in the cavity 337. The distribution valve block 343 is connected with the gas-liquid two-phase atomizing nozzle 344 through a pipeline. It can be understood that the first control valve 341 can control the communication between the air inlet and the outlet. The high-pressure inert gas provided by the gas supply device can enter the distribution valve block 343 through the first control valve 341 and the pipeline. The distribution valve block 343 divides the gas and then enters the gas-liquid two-phase atomizing nozzle 344 through the pipeline, and is sprayed into the cavity 337 and the material cavity by the gas-liquid two-phase atomizing nozzle 344. After the high-pressure inert gas contacts the material, as the arc-shaped paddle 334 continues to rotate, the high-pressure gas is wrapped in the material to form bubbles, thereby enhancing the stirring effect. Under the action of gas pressure, these gases are discharged through the one-way exhaust valve 317.

[0047] The air inlet of the first control valve 341 is connected with the air supply device through a pipeline, the liquid inlet of the first control valve 341 is connected with the feeding mechanism 4 through a pipeline, the feeding mechanism 4 is fixedly installed on the stirring mechanism 3, and the feeding mechanism 4 is connected with the auxiliary stirring assembly 34. Specifically, the feeding mechanism 4 comprises a mixed water tank 41, a liquid supply pump 42, a liquid storage tank 43 and a second control valve 431. The mixed water tank 41 is fixedly connected to the upper portion of the stirring tank 31, the mixed water tank 41 is connected with the liquid inlet of the first control valve 341 through the liquid supply pump 42 and a pipeline, the liquid storage tank 43 and the second control valve 431 are sequentially arranged on the pipeline between the rotary joint 342 and the distribution valve block 343, the liquid storage tank 43 is fixedly connected with the inner wall of the hole in the rotating shaft 331, and the second control valve 431 is fixedly connected with the lower end of the liquid storage tank 43. It can be understood that the first control valve 341 controls the liquid inlet to be communicated with the outlet, at this time, the second control valve 431 is closed, and the liquid in the mixed water tank 41 is pumped into the liquid storage tank 43 through the pipeline and the first control valve 341 by the liquid supply pump 42; then the second control valve 431 is opened, and at the same time, the first control valve 341 controls the air inlet to be communicated with the outlet, the high-pressure gas pushes the liquid in the liquid storage tank 43 to be atomized and sprayed from the gas-liquid two-phase atomizing nozzle 344, and the liquid is in contact with the material in the material cavity and is wrapped with the gas together.

[0048] The above is only an embodiment of the present application, and the specific structure and characteristics of the scheme are not described in detail, and the ordinary technical personnel in the art knows all the ordinary technical knowledge in the technical field of the present application before the application date or the priority date, can know all the prior art in the field, and has the ability to apply the conventional experimental means before the date, and the ordinary technical personnel in the art can improve and implement the present scheme under the guidance of the present application, and some typical known structures or known methods should not be an obstacle for the ordinary technical personnel to implement the present application. It should be pointed out that, for the technical personnel in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application.

Claims

1. An apparatus for stirring a material for use in analytical chemistry, characterized by Include: Frame (1), mixing mechanism (2), stirring mechanism (3) and feeding mechanism (4); The frame (1) comprises a connecting support (11) and a supporting support (12), the supporting support (12) is fixedly arranged at the bottom of the stirring mechanism (3), and the stirring mechanism (3) is fixedly connected with the mixing mechanism (2) through the connecting support (11); The mixing mechanism (2) is connected with the stirring mechanism (3); The stirring mechanism (3) comprises a stirring tank (31), a second driving motor (32), a stirring assembly (33) and an auxiliary stirring assembly (34), the stirring tank (31) is a hollow tank body with both ends open, the stirring tank (31) further comprises a first connecting flange (314) and a second connecting flange (316), the first connecting flange (314) is fixedly connected at the upper end opening of the stirring tank (31), the second connecting flange (316) is fixedly connected at the lower end opening of the stirring tank (31), the lower end of the first connecting flange (314) is provided with an arc-shaped protrusion (315), the stirring assembly (33) is rotatably installed on the first connecting flange (314) and the second connecting flange (316), the auxiliary stirring assembly (34) is installed on the stirring assembly (33), and the auxiliary stirring assembly (34) is connected with the gas supply device; The feeding mechanism (4) is fixedly installed on the stirring mechanism (3), and the feeding mechanism (4) is connected with the auxiliary stirring assembly (34).

2. A material stirring device for analytical chemistry according to claim 1, characterized in that: The mixing mechanism (2) comprises a mixing tank (21), a first driving motor (22) and a stirring rod (23), the mixing tank (21) comprises a first discharge port (211) and a motor support (212), the mixing tank (21) is a tank body with an upper end opening, the first discharge port (211) is arranged at the lower end of the mixing tank (21), and the motor support (212) is fixedly arranged at the upper end opening of the mixing tank (21); the first driving motor (22) is fixedly installed on the motor support (212), and the stirring rod (23) is rotatably arranged in the mixing tank (21) and connected with the first driving motor (22).

3. A material stirring device for analytical chemistry according to claim 1, characterized in that: The stirring tank (31) is further provided with a feeding pipe (311), a second discharge port (313) and a one-way exhaust valve (317), the feeding pipe (311) is fixedly arranged at the upper end of the feeding pipe (311), the feeding pipe (311) is connected with the first discharge port (211) of the mixing tank (21), the feeding pipe (311) is provided with a valve (312), and the one-way exhaust valve (317) is arranged at the upper end of the stirring tank (31).

4. The apparatus according to claim 1, wherein: The stirring assembly (33) comprises a rotating shaft (331), a transmission gear (332), a connecting rod (333) and an arc-shaped paddle (334), the rotating shaft (331) is provided with a middle hole, the upper end of the rotating shaft (331) extends to the outside of the stirring tank (31) through the first connecting flange (314), the rotating shaft (331) is rotationally matched with the first connecting flange (314) and the second connecting flange (316), the arc-shaped paddle (334) is fixedly connected to the rotating shaft (331) through the connecting rod (333), and the transmission gear (332) is fixedly arranged at the upper end of the rotating shaft (331) and is engaged with the second driving motor (32).

5. A material stirring device for analytical chemistry according to claim 4, characterized in that: The arc-shaped paddle (334) comprises a first paddle surface (335) and a second paddle surface (336), the upper and lower ends of the arc-shaped paddle (334) are bent towards the rotating shaft (331), the connecting end of the first paddle surface (335) and the second paddle surface (336) is located in front of the rotating direction of the arc-shaped paddle (334), and the first paddle surface (335) and the second paddle surface (336) form a cavity (337).

6. A material stirring device for analytical chemistry according to claim 5, characterized in that: The second paddle surface (336) is an arc surface, and the arc-shaped direction of the second paddle surface (336) is matched with the rotating track of the arc-shaped paddle (334).

7. A material stirring device for analytical chemistry according to claim 5, characterized in that: The first paddle surface (335) is an arc surface, and one end of the first paddle surface (335) which is not connected to the second paddle surface (336) is bent towards the rotating shaft (331).

8. A material stirring device for analytical chemistry according to any one of claims 5-7, characterized in that: The lower ends of the first paddle surface (335) and the second paddle surface (336) are bent towards the front of the rotating direction of the arc-shaped paddle (334), and the upper ends of the first paddle surface (335) and the second paddle surface (336) are bent towards the rear of the rotating direction of the arc-shaped paddle (334).

9. A material stirring device for analytical chemistry according to claim 5, characterized in that: The auxiliary stirring assembly (34) comprises a first control valve (341), a rotary joint (342), a distribution valve block (343) and a gas-liquid two-phase atomizing nozzle (344), the first control valve (341) is fixedly connected to the stirring tank (31), the first control valve (341) is provided with an air inlet, a liquid inlet and an outlet, the rotary joint (342) is installed on the rotating shaft (331), the distribution valve block (343) is fixedly installed on the inner wall of the middle hole of the rotating shaft (331), the outlet of the first control valve (341) is connected with the distribution valve block (343) through the rotary joint (342) and a pipeline, the gas-liquid two-phase atomizing nozzle (344) is fixedly installed in the cavity (337), the distribution valve block (343) is connected with the gas-liquid two-phase atomizing nozzle (344) through a pipeline, the air inlet of the first control valve (341) is connected with a gas supply device through a pipeline, and the liquid inlet of the first control valve (341) is connected with the feeding mechanism (4) through a pipeline.

10. A material stirring device for analytical chemistry according to claim 9, characterized in that: The feeding mechanism (4) comprises a mixed water tank (41), a liquid supply pump (42), a liquid storage tank (43) and a second control valve (431), the mixed water tank (41) is fixedly connected to the upper part of the stirring tank (31), the mixed water tank (41) is connected with the liquid inlet of the first control valve (341) through the liquid supply pump (42) and the pipeline, the liquid storage tank (43) and the second control valve (431) are sequentially arranged on the pipeline between the rotary joint (342) and the distribution valve block (343), the liquid storage tank (43) is fixedly connected with the inner wall of the hole in the rotating shaft (331), and the second control valve (431) is fixedly connected with the lower end of the liquid storage tank (43).

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