Sampling device for liquid chemical preparation

Abstract

The invention discloses a sampling device for liquid chemical preparation, and belongs to the technical field of chemical preparation, the sampling device comprises a protective shell, the top of the protective shell is provided with an extraction mechanism, a first vacuum pump, a controller and an inert gas storage tank, and the protective shell is internally provided with a reaction kettle, a temporary storage mechanism, a flash evaporation mechanism and a discharging mechanism; the flash evaporation mechanism comprises a vacuum buffer tank, a negative pressure regulating valve, a bent pipe and a communicating pipe, and the temporary storage mechanism comprises a bracket, a rotating motor, a rotating frame, a cleaning cylinder and a temporary storage cylinder. According to the invention, full-automatic sampling of liquid chemicals in a completely closed inert gas environment is realized, flash evaporation of part of components of a sample is initiated by instantly applying precisely controlled micro negative pressure through an original deep rapid freezing technology, and the whole sample is subjected to phase change from a liquid state to a supercooled glassy state within milliseconds by utilizing latent heat of vaporization.

Description

Technical Field

[0001] This invention relates to the field of chemical preparation technology, and in particular to a sampling device for the preparation of liquid chemicals. Background Technology

[0002] Currently, sampling operations in the field of high-end chemical preparation mostly rely on open or simple closed sampling valves. These devices typically consist of a sampling tube, valve, and sample container, and their function is limited to transferring liquid from a specific location. They cannot meet the sampling needs of materials with complex rheological properties or those sensitive to oxygen and water.

[0003] Patent document CN219015675U discloses a chemical sampling device, belonging to the field of chemical processing. It includes a cabinet, a sampling container, a sampling pipe, and a negative pressure component. The sampling container is installed inside the cabinet, and the sampling pipe is installed inside the cabinet. One end of the sampling pipe extends out of the cabinet for inserting into a chemical raw material barrel, and the other end is connected to the sampling container. The negative pressure component is connected to the sampling pipe and is used to generate negative pressure in the sampling pipe so that the sampling pipe can transport the chemical raw material in the chemical raw material barrel to the sampling container.

[0004] The drawback of existing technologies lies in their inability to maintain the original state of the sample at the moment of sampling. For catalyst slurries, emulsions, suspensions, etc., phase separation and sedimentation occur instantaneously. Any disturbance introduced by the sampling action will disrupt its original dispersion state. Even with stirring, phase separation may have already occurred during the time difference between the cessation of stirring and the completion of sampling. Achieving transient freezing and perfectly locking the multiphase distribution of the sample within the reaction system at the moment of sampling is an extremely difficult challenge. Furthermore, conventional equipment cannot completely isolate the sample from air during sampling and sample transfer. For ultrapure chemicals, even trace contact can lead to sample oxidation or contamination, rendering subsequent precise analysis results meaningless. Therefore, we propose a sampling device for liquid chemical preparation to address this problem. Summary of the Invention

[0005] The purpose of this invention is to provide a sampling device for the preparation of liquid chemicals, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A sampling device for preparing liquid chemicals includes: a protective shell, the top of which is provided with an extraction mechanism, a first vacuum pump, a controller, and an inert gas storage tank; the interior of the protective shell is provided with a reaction vessel, a temporary storage mechanism, a flash evaporation mechanism, and a discharge mechanism; the flash evaporation mechanism includes: a vacuum buffer tank, a negative pressure regulating valve, a bend, and a connecting pipe; the temporary storage mechanism includes: a bracket, a rotary motor, a rotating frame, a cleaning cylinder, and a temporary storage cylinder; the bottom of the temporary storage cylinder is provided with a bottom cover; the bottom end of the bend is connected to the temporary storage cylinder; and the top end of the bend is rotatably installed inside the connecting pipe.

[0008] Preferably, the rotary motor is fixedly installed on the top of the bracket, the bracket is fixedly installed on the top of the reactor, a positioning frame is fixedly installed on the top of the bracket, the output shaft of the rotary motor is rotatably installed in the positioning frame, the rotating frame is fixedly installed on the output shaft of the rotary motor, the cleaning cylinder and the temporary storage cylinder are both fixedly installed in the rotating frame, and a photoelectric sensor is provided on the top of the temporary storage cylinder;

[0009] The bottom cover is movably sealed against the bottom end of the temporary storage cylinder. A connecting frame is fixedly installed on one side of the bottom cover. A fixed frame is fixedly installed at the bottom of the rotating frame. A third electric push rod is hinged inside the fixed frame. A hinge plate is fixedly installed on the output end of the third electric push rod. Both the hinge plate and the bottom end of the fixed frame are rotatably installed inside the connecting frame.

[0010] Preferably, a plurality of first stabilizing frames are fixedly installed on the top of the rotating frame, the bent pipe is fixedly installed inside the first stabilizing frames, a plurality of second stabilizing frames are fixedly installed on the top inner wall of the protective shell, the connecting pipe is fixedly installed inside the second stabilizing frames, the other end of the connecting pipe is connected to the vacuum buffer tank, the negative pressure regulating valve is provided on the connecting pipe, a pressure gauge and a second vacuum pump are connected to the top of the vacuum buffer tank, and the vacuum buffer tank is fixedly installed inside the protective shell.

[0011] Preferably, the extraction mechanism includes: a fixed base, an extraction tube, a lifting frame, and a piston plate. The fixed base is fixedly installed on the top of the protective shell. First electric push rods are fixedly installed on both sides of the top of the fixed base. The lifting frame is fixedly installed on the output end of the first electric push rods. The extraction tube is slidably installed inside the fixed base. The top end of the extraction tube is fixedly installed inside the lifting frame. A mounting frame is fixedly installed inside the extraction tube. A second electric push rod is fixedly installed at the bottom of the mounting frame. A U-shaped rod is fixedly installed on the output end of the second electric push rod. A drive plate is fixedly installed at the bottom end of the U-shaped rod. A first pressure sensor and a second pressure sensor are fixedly installed at the top and bottom of the drive plate, respectively. The piston plate is slidably installed inside the extraction tube. A connecting rod is fixedly installed on the top of the piston plate and slidably connected to the drive plate. A pressure plate is fixedly installed on the top end of the connecting rod. The pressure plate movably abuts against the top end of the first pressure sensor. The piston plate movably abuts against the bottom end of the second pressure sensor. A suction nozzle is connected to the bottom end of the extraction tube.

[0012] Preferably, the discharge mechanism includes: a rotating disk, a drive motor, a fourth electric push rod, and multiple storage mechanisms. The drive motor and the fourth electric push rod are fixedly installed inside the protective shell. A top plate is fixedly installed on the output end of the fourth electric push rod. The rotating disk is fixedly installed on the output shaft of the drive motor. Multiple grooves are provided on the outer side of the rotating disk, and the storage mechanisms are arranged in the corresponding grooves.

[0013] Preferably, the storage mechanism includes: a storage box, a top cover, a sliding plate, and a locking disc. The top of the storage box has a storage cavity, the top cover is movably abutted against the top of the storage cavity, the top of the top cover has a round hole, a connecting shaft is fixedly installed between the top cover and the locking disc, the connecting shaft is rotatably installed in the storage box, a locking plate and a top rod are fixedly installed at the bottom of the sliding plate, a push plate is fixedly installed at the bottom end of the top rod, and a plurality of locking slots are opened at the top of the locking disc, the bottom end of the locking plate is movably inserted into the corresponding locking slot.

[0014] The bottom of the storage box has a square groove and a round groove. The push plate is slidably installed in the square groove, and the locking disc is rotatably installed in the round groove. A torsion spring is fixedly installed on the top of the locking disc, and the top of the torsion spring is fixedly installed on the inner wall of the top of the round groove.

[0015] A lateral groove is provided on one side of the storage box, and a fixing rod is fixedly installed in the lateral groove. The sliding plate is slidably sleeved on the outside of the fixing rod, and a compression spring is fixedly installed on the top of the sliding plate. The top of the compression spring is fixedly connected to the fixing rod.

[0016] A positioning plate is fixedly installed on the side wall of the groove. The positioning plate is movably inserted into the side groove. Limiting strips are integrally formed on the inner walls of the front and rear sides of the groove. Limiting grooves that match the limiting strips are opened on the front and rear sides of the storage box. The top plate is located directly below the push plate.

[0017] Preferably, a support frame is fixedly installed at the bottom of the protective shell, an injection pipe is connected to one side of the inert gas storage tank, an electrically controlled valve is provided on the injection pipe, a lateral hole adapted to the rotating disk is opened on one side of the protective shell, a feed pipe is connected to the top of the reactor, and a discharge pipe is connected to the bottom of the reactor.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. In this invention, a sampling device for preparing liquid chemicals is used to start a first vacuum pump to evacuate the protective shell, and then open an electronically controlled valve to inject inert gas from an inert gas storage tank into the protective shell through an injection pipe, thereby preventing chemicals from being exposed to the external air environment and becoming contaminated.

[0020] 2. By starting the rotary motor to drive the rotating frame to rotate 90 degrees, the temporary storage cylinder is moved away from the top of the reactor. Then, the first electric push rod is started to drive the lifting frame and the extraction tube to move downward, so that the extraction tube extends into the reactor. Then, the second electric push rod is started to drive the U-shaped rod and the drive plate to move upward. The drive plate, through the contact between the first pressure sensor and the pressure plate, drives the connecting rod and the piston plate to move upward, so that a negative pressure is generated at the suction nozzle, which draws the liquid chemicals in the reactor into the extraction tube. Then, the first electric push rod is started to drive the extraction tube to move upward and reset, thus realizing the extraction of the liquid chemical sample.

[0021] 3. In this invention, the sampling device for preparing liquid chemicals involves starting a rotary motor to rotate the rotating frame 90 degrees in the opposite direction, causing the temporary storage cylinder to move back to directly below the extraction tube. Then, the first electric push rod is activated to insert the extraction tube into the temporary storage cylinder. Simultaneously, a photoelectric sensor senses the extraction tube, and after the extraction tube enters the temporary storage cylinder, the controller receives the signal from the photoelectric sensor and controls the negative pressure regulating valve to open instantaneously. The temporary storage cylinder is connected to a pre-evacuated vacuum buffer tank via a connecting pipe and a bend. Due to the huge pressure difference, the pressure inside the temporary storage cylinder drops rapidly from atmospheric pressure to a pre-calculated target negative pressure value within milliseconds. At the instant of the pressure drop, the light component solvent in the sample reaches a superheated state. In the process of rapid and brief flash evaporation, a large number of volatile component molecules vaporize, absorbing a huge amount of latent heat of vaporization. This heat is directly taken from the remaining sample liquid. Due to the extremely rapid and adiabatic process, the heat does not have time to be exchanged with the outside, causing the overall temperature of the sample to drop precipitously. This ultra-fast cooling rate causes the sample to instantly pass through the crystallization zone and directly enter the supercooled liquid or even glassy solid state. The microscopic viscosity increases sharply by several orders of magnitude, and all diffusion and phase separation movements are completely frozen. At this time, the sample remaining in the temporary storage cylinder is no longer a liquid, but a "frozen" solid that maintains the macroscopic form of a liquid but has the microscopic fluidity of a solid. Its internal particle distribution and droplet size are completely consistent with the instant of sampling.

[0022] 4. In this invention, the sampling device for preparing liquid chemicals involves activating a first electric push rod to move the extraction tube upwards, then activating a rotary motor to rotate the rotating frame half a turn, causing the temporary storage cylinder and the cleaning cylinder to switch positions. Pushing the push plate at the bottom of the dust removal mechanism upwards moves the top rod, sliding plate, and locking plate upwards, disengaging the locking plate from the locking groove. Then, rotating the locking disc at the bottom of the storage mechanism rotates the connecting shaft and the top cover, positioning the circular hole on the top cover directly above the storage cavity. Releasing the push plate allows the locking plate to reset under the action of the compression spring and engage in the locking groove, locking the locking disc and thus securing the top cover. The storage box is then placed into the groove of the rotating disc, and the drive motor is activated to rotate the rotating disc, moving the storage box directly below the temporary storage cylinder. The third electric push rod is activated to retract its output end, thereby rotating the connecting frame and bottom cover, causing the solid sample in the temporary storage cylinder to fall into the storage cavity. Then, the fourth electric push rod is activated to move the top plate upward, pushing the push plate upward, which in turn moves the top rod, slide plate and locking plate upward, thereby releasing the locking plate. The locking plate is then reset under the action of the torsion spring, and the connecting shaft and top cover are rotated. The top cover seals the storage cavity. Then, the fourth electric push rod is controlled to reset the top plate and drive the drive motor to rotate the rotating disk, moving the storage box to the outside of the protective shell. This allows the storage box to be pulled out horizontally and moved to the low-temperature storage area, so that the frozen solid sample can be taken out of the protective shell without affecting the inert gas environment inside the protective shell.

[0023] 5. The sampling device for preparing liquid chemicals described in this invention can sample liquid chemicals in a closed environment without any manual operation through the cooperation of the extraction mechanism, protective shell, temporary storage mechanism and discharge mechanism, thereby avoiding harm to the human body. Moreover, the sampled and exported sample can be stored in a closed environment to prevent the sample from being exposed to the external environment and contaminated.

[0024] 6. The sampling device for preparing liquid chemicals described in this invention enables fully automated sampling of liquid chemicals in a completely sealed inert gas environment. Its unique deep rapid freezing technology induces flash evaporation of some components of the sample by applying precisely controlled micro-negative pressure instantaneously. Utilizing the latent heat of vaporization, the entire sample undergoes a phase transition from liquid to supercooled glass within milliseconds, thereby perfectly locking the instantaneous dispersion state of the multiphase system sample. This completely solves the problem of sample distortion caused by phase separation and shear force. After sampling, the sample is removed under air-isolated conditions through an intelligent conveying and sealed storage mechanism. The entire process requires no manual intervention, greatly ensuring operational safety and sample authenticity. Attached Figure Description

[0025] Figure 1This is a three-dimensional structural diagram of a sampling device for preparing liquid chemicals proposed in this invention;

[0026] Figure 2 This is a cross-sectional view of a sampling device for preparing liquid chemicals proposed in this invention.

[0027] Figure 3 This is a three-dimensional structural diagram of the temporary storage mechanism and flash evaporation mechanism proposed in this invention;

[0028] Figure 4 This is a cross-sectional view of the temporary storage mechanism and flash evaporation mechanism proposed in this invention.

[0029] Figure 5 This is a three-dimensional structural diagram of the temporary storage mechanism proposed in this invention;

[0030] Figure 6 This is a partial three-dimensional structural schematic diagram of the temporary storage mechanism proposed in this invention;

[0031] Figure 7 This is a three-dimensional structural diagram of the extraction mechanism proposed in this invention;

[0032] Figure 8 This is a cross-sectional view of the extraction mechanism proposed in this invention.

[0033] Figure 9 This is a partial three-dimensional structural schematic diagram of the extraction mechanism proposed in this invention;

[0034] Figure 10 This is a three-dimensional structural diagram of the discharge mechanism proposed in this invention;

[0035] Figure 11 This is a three-dimensional structural diagram of the rotating disk proposed in this invention;

[0036] Figure 12 This is a cross-sectional view of the discharge mechanism proposed in this invention.

[0037] Figure 13 This is a three-dimensional structural diagram of the storage mechanism proposed in this invention;

[0038] Figure 14 This is a cross-sectional structural schematic diagram of the storage mechanism proposed in this invention;

[0039] Figure 15 This is a partial three-dimensional structural diagram of the storage mechanism proposed in this invention.

[0040] In the diagram: 1. Protective shell; 2. Extraction mechanism; 201. Fixed base; 202. First electric push rod; 203. Lifting frame; 204. Extraction tube; 205. Mounting frame; 206. Second electric push rod; 207. U-shaped rod; 208. Piston plate; 209. Connecting rod; 210. Pressure plate; 211. First pressure sensor; 212. Second pressure sensor; 213. Drive plate; 3. Temporary storage mechanism; 301. Bracket; 302. Positioning frame; 303. Rotary motor; 304. Rotating frame; 305. Cleaning cylinder; 306. Temporary storage cylinder; 307. Photoelectric sensor; 308. Bottom cover; 309. Fixed frame; 310. Connecting frame; 311. Hinge plate; 312. Third electric push rod; 4. Flash evaporation mechanism; 401. Vacuum buffer tank; 402. Second vacuum pump; 403. 1. Pressure gauge; 404. Connecting pipe; 405. Negative pressure regulating valve; 406. Bend; 407. First stabilizer; 5. Rotating disc; 501. Drive motor; 502. Limiting groove; 503. Positioning plate; 6. Storage mechanism; 601. Storage box; 60101. Storage cavity; 60102. Side groove; 60103. Limiting strip; 602. Top cover; 603. Connecting shaft; 604. Locking disc; 605. Torsion spring; 606. Locking plate; 607. Slide plate; 608. Compression spring; 609. Fixing rod; 610. Top rod; 611. Push plate; 7. Fourth electric push rod; 701. Top plate; 8. Inert gas storage tank; 801. Electrically controlled valve; 802. Injection pipe; 9. Reactor; 901. Discharge pipe; 902. Feed pipe; 10. Controller; 11. First vacuum pump. Detailed Implementation

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0042] Reference Figure 1 - Figure 15 A sampling device for preparing liquid chemicals includes: a protective shell 1, with an extraction mechanism 2, a first vacuum pump 11, a controller 10, and an inert gas storage tank 8 disposed on the top of the protective shell 1; a reaction vessel 9, a temporary storage mechanism 3, a flash evaporation mechanism 4, and a discharge mechanism disposed inside the protective shell 1; the flash evaporation mechanism 4 includes: a vacuum buffer tank 401, a negative pressure regulating valve 405, a bend 406, and a connecting pipe 404; the temporary storage mechanism 3 includes: a bracket 301, a rotary motor 303, a rotating frame 304, a cleaning cylinder 305, and a temporary storage cylinder 306; a bottom cover 308 is disposed at the bottom of the temporary storage cylinder 306; the bottom end of the bend 406 is connected to the temporary storage cylinder 306; and the top end of the bend 406 is rotatably installed inside the connecting pipe 404.

[0043] In this embodiment, the rotary motor 303 is fixedly installed on the top of the bracket 301, the bracket 301 is fixedly installed on the top of the reactor 9, the top of the bracket 301 is fixedly installed with a positioning frame 302, the output shaft of the rotary motor 303 is rotatably installed in the positioning frame 302, the rotating frame 304 is fixedly installed on the output shaft of the rotary motor 303, the cleaning cylinder 305 and the temporary storage cylinder 306 are both fixedly installed in the rotating frame 304, and the top of the temporary storage cylinder 306 is provided with a photoelectric sensor 307;

[0044] The bottom cover 308 is movably sealed against the bottom end of the temporary storage cylinder 306. A connecting frame 310 is fixedly installed on one side of the bottom cover 308. A fixed frame 309 is fixedly installed at the bottom of the rotating frame 304. A third electric push rod 312 is hinged inside the fixed frame 309. A hinge plate 311 is fixedly installed on the output end of the third electric push rod 312. The bottom ends of the hinge plate 311 and the fixed frame 309 are rotatably installed inside the connecting frame 310.

[0045] In this embodiment, a plurality of first stabilizers 407 are fixedly installed on the top of the rotating frame 304, and a bent pipe 406 is fixedly installed inside the first stabilizers 407. A plurality of second stabilizers are fixedly installed on the top inner wall of the protective shell 1. A connecting pipe 404 is fixedly installed inside the second stabilizers. The other end of the connecting pipe 404 is connected to the vacuum buffer tank 401. A negative pressure regulating valve 405 is provided on the connecting pipe 404. A pressure gauge 403 and a second vacuum pump 402 are connected to the top of the vacuum buffer tank 401. The vacuum buffer tank 401 is fixedly installed inside the protective shell 1.

[0046] In this embodiment, the extraction mechanism 2 includes: a fixed base 201, an extraction tube 204, a lifting frame 203, and a piston plate 208. The fixed base 201 is fixedly installed on the top of the protective shell 1. First electric push rods 202 are fixedly installed on both sides of the top of the fixed base 201. The lifting frame 203 is fixedly installed on the output end of the first electric push rods 202. The extraction tube 204 is slidably installed inside the fixed base 201. The top end of the extraction tube 204 is fixedly installed inside the lifting frame 203. A mounting bracket 205 is fixedly installed inside the extraction tube 204. A second electric push rod 206 is fixedly installed at the bottom of the mounting bracket 205. A piston plate 208 is fixedly installed on the output end of the second electric push rod 206. A U-shaped rod 207 is fixedly installed, and a drive plate 213 is fixedly installed at the bottom end of the U-shaped rod 207. A first pressure sensor 211 and a second pressure sensor 212 are fixedly installed at the top and bottom of the drive plate 213, respectively. A piston plate 208 is slidably installed inside the extraction tube 204. A connecting rod 209 is fixedly installed at the top of the piston plate 208 and is slidably connected inside the drive plate 213. A pressure plate 210 is fixedly installed at the top of the connecting rod 209. The pressure plate 210 movably abuts against the top of the first pressure sensor 211. The piston plate 208 movably abuts against the bottom end of the second pressure sensor 212. The bottom end of the extraction tube 204 is connected to a suction nozzle.

[0047] In this embodiment, the discharge mechanism includes: a rotating disk 5, a drive motor 501, a fourth electric push rod 7, and multiple storage mechanisms 6. The drive motor 501 and the fourth electric push rod 7 are fixedly installed inside the protective shell 1. A top plate 701 is fixedly installed on the output end of the fourth electric push rod 7. The rotating disk 5 is fixedly installed on the output shaft of the drive motor 501. Multiple grooves are opened on the outer side of the rotating disk 5, and the storage mechanisms 6 are set in the corresponding grooves.

[0048] In this embodiment, the storage mechanism 6 includes: a storage box 601, a top cover 602, a sliding plate 607, and a locking disc 604. The top of the storage box 601 has a storage cavity 60101. The top cover 602 is movably abutted against the top of the storage cavity 60101. The top of the top cover 602 has a round hole. A connecting shaft 603 is fixedly installed between the top cover 602 and the locking disc 604. The connecting shaft 603 is rotatably installed inside the storage box 601. A locking plate 606 and a push rod 610 are fixedly installed at the bottom of the sliding plate 607. A push plate 611 is fixedly installed at the bottom end of the push rod 610. The top of the locking disc 604 has multiple locking slots. The bottom end of the locking plate 606 is movably inserted into the corresponding locking slot.

[0049] The bottom of the storage box 601 is provided with a square groove and a round groove. The push plate 611 is slidably installed in the square groove, and the locking plate 604 is rotatably installed in the round groove. A torsion spring 605 is fixedly installed on the top of the locking plate 604, and the top of the torsion spring 605 is fixedly installed on the top inner wall of the round groove.

[0050] A lateral groove 60102 is provided on one side of the storage box 601. A fixing rod 609 is fixedly installed in the lateral groove 60102. A sliding plate 607 is slidably sleeved on the outside of the fixing rod 609. A compression spring 608 is fixedly installed on the top of the sliding plate 607. The top of the compression spring 608 is fixedly connected to the fixing rod 609.

[0051] A positioning plate 503 is fixedly installed on the side wall of the groove. The positioning plate 503 is movably inserted into the side groove 60102. Limiting strips 60103 are integrally formed on the inner walls of the front and rear sides of the groove. Limiting grooves 502 adapted to the limiting strips 60103 are opened on the front and rear sides of the storage box 601. The top plate 701 is located directly below the push plate 611.

[0052] In this embodiment, a support frame is fixedly installed at the bottom of the protective shell 1, an injection pipe 802 is connected to one side of the inert gas storage tank 8, an electric control valve 801 is provided on the injection pipe 802, a lateral hole adapted to the rotating disk 5 is opened on one side of the protective shell 1, a feed pipe 902 is connected to the top of the reactor 9, and a discharge pipe 901 is connected to the bottom of the reactor 9.

[0053] The above provides a detailed description of a sampling device for preparing liquid chemicals according to the present invention. Specific embodiments have been used to illustrate the principles and implementation methods of the invention. These embodiments are merely illustrative and are intended to help understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A sampling device for liquid chemical production, characterized by, Include: The protective shell (1), the top of the protective shell (1) is provided with extraction mechanism (2), first vacuum pump (11), controller (10) and inert gas tank (8), the inside of the protective shell (1) is provided with reaction kettle (9), temporary storage mechanism (3), flash mechanism (4) and discharge mechanism, the flash mechanism (4) includes: vacuum buffer tank (401), negative pressure regulating valve (405), elbow (406) and communication pipe (404), the temporary storage mechanism (3) includes: bracket (301), rotary motor (303), rotating frame (304), cleaning cylinder (305) and temporary storage cylinder (306), the bottom of the temporary storage cylinder (306) is provided with bottom cover (308), the bottom end of the elbow (406) is communicated with temporary storage cylinder (306), the top end of the elbow (406) is rotatably installed in the communication pipe (404).

2. The sampling device for liquid chemical preparation according to claim 1, wherein The rotary motor (303) is fixedly installed on the top of the bracket (301), the bracket (301) is fixedly installed on the top end of the reaction kettle (9), the top of the bracket (301) is fixedly installed with positioning frame (302), the output shaft of the rotary motor (303) is rotatably installed in the positioning frame (302), the rotating frame (304) is fixedly installed on the output shaft of the rotary motor (303), the cleaning cylinder (305) and the temporary storage cylinder (306) are fixedly installed in the rotating frame (304), the top of the temporary storage cylinder (306) is provided with photoelectric sensor (307); The bottom cover (308) is movably sealed against the bottom end of the temporary storage cylinder (306), one side of the bottom cover (308) is fixedly installed with connecting frame (310), the bottom of the rotating frame (304) is fixedly installed with fixed frame (309), the third electric push rod (312) is hinged in the fixed frame (309), the output end of the third electric push rod (312) is fixedly installed with hinged plate (311), the bottom end of the hinged plate (311) and the fixed frame (309) are rotatably installed in the connecting frame (310).

3. The sampling device for liquid chemical preparation according to claim 1, wherein The top of the rotating frame (304) is fixedly installed with a plurality of first stabilizing frames (407), the elbow (406) is fixedly installed in the first stabilizing frame (407), a plurality of second stabilizing frames are fixedly installed on the inner wall of the top of the protective shell (1), the communication pipe (404) is fixedly installed in the second stabilizing frame, the other end of the communication pipe (404) is communicated with the vacuum buffer tank (401), the negative pressure regulating valve (405) is arranged on the communication pipe (404), the top of the vacuum buffer tank (401) is communicated with pressure gauge (403) and second vacuum pump (402), the vacuum buffer tank (401) is fixedly installed in the protective shell (1).

4. The sampling device for liquid chemical preparation according to claim 1, wherein The extraction mechanism (2) comprises a fixed seat (201), an extraction pipe (204), a lifting frame (203) and a piston plate (208), the fixed seat (201) is fixedly installed at the top of the protective shell (1), the top of the fixed seat (201) is fixedly installed with a first electric push rod (202) on both sides, the lifting frame (203) is fixedly installed on the output end of the first electric push rod (202), the extraction pipe (204) is slidingly installed in the fixed seat (201), the top end of the extraction pipe (204) is fixedly installed in the lifting frame (203), the inside of the extraction pipe (204) is fixedly installed with a mounting bracket (205), the bottom of the mounting bracket (205) is fixedly installed with a second electric push rod (206), the output end of the second electric push rod (206) is fixedly installed with a U-shaped rod (207), the bottom end of the U-shaped rod (207) is fixedly installed with a driving plate (213), the top and bottom of the driving plate (213) are fixedly installed with a first pressure sensor (211) and a second pressure sensor (212) respectively, the piston plate (208) is slidingly installed in the extraction pipe (204), the top of the piston plate (208) is fixedly installed with a connecting rod (209), the connecting rod (209) is slidingly connected in the driving plate (213), the top end of the connecting rod (209) is fixedly installed with a pressure plate (210), the pressure plate (210) is movably abutted at the top end of the first pressure sensor (211), the piston plate (208) is movably abutted at the bottom end of the second pressure sensor (212), and the bottom end of the extraction pipe (204) is communicated with a suction nozzle.

5. The sampling device for liquid chemical preparation according to claim 1, wherein The discharging mechanism comprises a rotating disc (5), a driving motor (501), a fourth electric push rod (7) and a plurality of storage mechanisms (6), the driving motor (501) and the fourth electric push rod (7) are fixedly installed in the protective shell (1), the output end of the fourth electric push rod (7) is fixedly installed with a top plate (701), the rotating disc (5) is fixedly installed on the output shaft of the driving motor (501), a plurality of grooves are formed in the outer side of the rotating disc (5), and the storage mechanism (6) is arranged in the corresponding groove.

6. The sampling device for liquid chemical preparation according to claim 5, wherein The storage mechanism (6) comprises a storage box (601), a top cover (602), a sliding plate (607) and a locking disc (604), the top of the storage box (601) is provided with a storage cavity (60101), the top cover (602) is movably abutted at the top end of the storage cavity (60101), the top of the top cover (602) is provided with a circular hole, the top cover (602) and the locking disc (604) are fixedly installed with a connecting shaft (603), the connecting shaft (603) is rotatably installed in the storage box (601), the bottom of the sliding plate (607) is fixedly installed with a locking plate (606) and a top rod (610), the bottom end of the top rod (610) is fixedly installed with a push plate (611), the top of the locking disc (604) is provided with a plurality of locking grooves, and the bottom end of the locking plate (606) is movably inserted into the corresponding locking groove; The bottom of the storage box (601) is provided with a square groove and a circular groove, the push plate (611) is slidingly installed in the square groove, the locking disc (604) is rotatably installed in the circular groove, the top of the locking disc (604) is fixedly installed with a torsion spring (605), and the top end of the torsion spring (605) is fixedly installed on the top inner wall of the circular groove. One side of the storage box (601) is provided with a lateral groove (60102), the lateral groove (60102) is fixedly installed with a fixed rod (609), the sliding plate (607) is slidingly sleeved on the outside of the fixed rod (609), the top of the sliding plate (607) is fixedly installed with a compression spring (608), and the top end of the compression spring (608) is fixedly connected with the fixed rod (609). The side wall of the groove is fixedly installed with a positioning plate (503), the positioning plate (503) is movably inserted into the lateral groove (60102), the front and rear inner walls of the groove are integrally formed with limiting strips (60103), the front and rear sides of the storage box (601) are provided with limiting grooves (502) matched with the limiting strips (60103), and the top plate (701) is arranged directly below the push plate (611).

7. The sampling device for liquid chemical preparation according to claim 1, wherein The bottom of the protective shell (1) is fixedly installed with a support frame, one side of the inert gas storage tank (8) is communicated with an injection pipe (802), the injection pipe (802) is provided with an electric control valve (801), one side of the protective shell (1) is provided with a lateral hole matched with the rotating disc (5), the top of the reaction kettle (9) is communicated with a feeding pipe (902), and the bottom end of the reaction kettle (9) is communicated with a discharging pipe (901).

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