Automatic sampling system for chemical reactor and method of use

Abstract

The present invention relates to the field of chemical machinery technology, and specifically to an automatic sampling system for a chemical reactor and a method for using the system, comprising a sampling tube, a first cylindrical valve body, a liquid storage glass tube, a second cylindrical valve body and a third cylindrical valve body, wherein a control valve is provided on the outer wall of the first cylindrical valve body, and a buoyancy opening and closing component is provided in the liquid storage glass tube, the buoyancy opening and closing component comprising an annular floating plate, an upper blocking body, a lower blocking body, a resistance member and a limit mechanism, and the device automatically controls the opening and closing of two groups of valve bodies through the buoyancy opening and closing component, thereby achieving after the liquid level in the liquid storage glass tube rises to a certain extent, providing negative pressure suction to close the negative pressure tank, and at the same time closing the liquid inlet tank for the upward flow of liquid, ultimately ensuring that the liquid is suspended in the liquid storage glass tube, and in this process, no manual intervention is required, thereby eliminating the leakage caused by manual operation to close the valve body, and further improving the efficiency of liquid sampling.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical machinery, in particular to an automatic sampling system for a chemical reactor and a use method thereof. Background Art

[0002] A reactor is broadly understood as a container for physical or chemical reactions. Through the structural design and parameter configuration of the container, the heating, evaporation, cooling and low-speed mixing functions required by the process are achieved.

[0003] A reactor is a comprehensive reaction vessel, with its structure, functions, and accessories designed according to reaction conditions. From feeding to reaction to discharging, the reactor can complete pre-set reaction steps with a high degree of automation, strictly controlling key parameters such as temperature, pressure, mechanical control, and reactant concentration. Its structure generally consists of a reactor body, transmission device, stirring device, heating device, cooling device, and sealing device. Auxiliary equipment includes fractionating columns, condensers, water separators, collection tanks, and filters.

[0004] During production, it is necessary to sample and observe the reactant liquid in the reactor, and a sampler is needed for sampling. Traditional samplers are mostly composed of an inner tube, a liquid storage tube, a sampling bottle, a negative pressure system and a valve system. The valve system includes multiple valves, which are used to control the inlet and outlet of liquid and gas, respectively, to ensure that the liquid storage tube is a closed negative pressure space when the liquid is extracted. After the liquid is extracted, the air pressure in the liquid storage tube is kept consistent with the external air pressure, thereby achieving the discharge of the liquid in the liquid storage tube. The negative pressure system is used to provide negative pressure suction to ensure that the liquid in the reactor can be extracted. In actual operation, the operator must observe the liquid level in the liquid storage tube in real time to manually control the valve system to ensure that the liquid is discharged into the sampling bottle. Manual control of the valve system is prone to leakage. At the same time, since there are many valves that need to be manually controlled, it will further cause a valve to not be opened or closed in time, which will eventually affect the sampling and collection of the liquid. Therefore, it is necessary to provide an automatic sampling system for chemical reactors and a method for use to solve the above problems. Summary of the Invention

[0005] Based on this, it is necessary to provide an automatic sampling system for a chemical reactor and a method for use thereof in response to existing technical problems.

[0006] In order to solve the problems of the existing technology, the technical solution adopted by the present invention is: an automatic sampling system for a chemical reactor, comprising a sampling tube, a first cylindrical valve body, a liquid storage glass tube, a second cylindrical valve body and a third cylindrical valve body which are coaxially connected end to end and distributed in sequence from bottom to top in the vertical direction, a liquid inlet groove is coaxially provided in the first cylindrical valve body, a liquid discharge groove which is horizontal and connected to the liquid inlet groove is provided on the outer wall of the first cylindrical valve body, a through groove is coaxially provided in the second cylindrical valve body, a ventilation groove which is horizontal and connected to the through groove is provided on the outer wall of the second cylindrical valve body, a connecting groove is coaxially provided in the third cylindrical valve body, a negative pressure groove which is horizontal and connected to the connecting groove is provided on the outer wall of the third cylindrical valve body, the upper end of the sampling tube is connected to the lower end of the liquid inlet groove, and the upper and lower ends of the liquid storage glass tube are respectively connected to the lower end of the through groove and the upper end of the liquid inlet groove. The upper end of the through groove is connected with the lower end of the connecting groove. A control valve for opening and closing the drainage groove is provided on the outer wall of the first cylindrical valve body. A buoyancy opening and closing assembly is provided in the liquid storage glass tube. The buoyancy opening and closing assembly includes an annular floating plate, an upper blocking body, a lower blocking body, a resistance piece and a limiting mechanism. The upper blocking body and the lower blocking body are connected by a vertical rod. The resistance piece is provided on the vertical rod, and the resistance piece is located above the annular floating plate. The annular floating plate slides in the liquid storage glass tube and is movably sleeved on the vertical rod. The limiting mechanism includes a limiting ring and a limiting plate. The limiting ring is molded in the liquid storage glass tube, and the limiting ring is used to limit the downward movement of the annular floating plate. The limiting plate is molded in the upper end of the sampling tube, and the limiting plate is used to limit the downward movement of the lower blocking body. The annular floating plate and the upper blocking body are both hollow structures. The upper blocking body is used to open and close the ventilation groove and the negative pressure groove, and the lower blocking body is used to open and close the liquid inlet groove.

[0007] Furthermore, the connecting groove is divided into a conical groove and a narrow groove from bottom to top. The small-diameter end of the conical groove faces upward, and the large-diameter end of the conical groove is connected to the upper end of the through groove. The narrow groove is vertical and its lower end is connected to the small-diameter end of the conical groove. The negative pressure groove is connected to the upper end of the narrow groove. The diameter of the ventilation groove is smaller than the diameter of the through groove. The upper blocking body is a cylindrical shell sliding in the through groove. The outer diameter of the cylindrical shell is consistent with the diameter of the through groove. The upper end of the cylindrical shell gradually shrinks upward to become a No. 1 conical shell that fits the conical groove, and the lower end of the cylindrical shell gradually shrinks downward to become a No. 2 conical shell. The circumference of the No. 1 conical shell is provided with air holes evenly distributed along its circumferential direction. The upper end of the vertical rod passes through the No. 2 conical shell and the cylindrical shell in turn and is coaxially fixed to the bottom of the No. 1 conical shell.

[0008] Furthermore, the lower blocking body is a sealing circular plate, the upper half of the liquid inlet trough is cylindrical, and its lower half is flared. The upper end of the sampling tube is connected to the lower half of the liquid inlet trough. The limiting plate is circular and its outer diameter is smaller than the inner diameter of the sampling tube. The top of the limiting plate is provided with a circular groove that is concave downward and used to accommodate the sealing circular plate. A circle of horizontal connecting strips evenly distributed along the circumferential direction of the limiting plate is provided between the limiting plate and the sampling tube. The two ends of each horizontal connecting strip are respectively connected to the outer wall of the limiting plate and the inner wall of the sampling tube. A circular ring is coaxially formed in the upper half of the liquid inlet trough, and the center of the circular ring is the liquid inlet. The lower end of the vertical rod passes downward through the liquid inlet and is coaxially fixed to the top of the sealing circular plate.

[0009] Furthermore, the annular floating plate is a hollow structure, and is provided with a number of strip-shaped air-permeable grooves evenly distributed along the circumferential direction of the annular floating plate. Two limit strips evenly distributed along the circumferential direction of the liquid storage glass tube are formed on the inner wall of the liquid storage glass tube. The length direction of each limit strip is parallel to the axial direction of the liquid storage glass tube. Two limit grooves are provided on the circumferential wall of the annular floating plate, which are respectively slidably matched with the two limit strips.

[0010] Furthermore, the middle section of the vertical rod is a threaded structure, and the resistance member is a threaded sleeve screwed on the middle section of the vertical rod. Two branches are formed on the outer wall of the threaded sleeve and are evenly distributed along the circumferential direction of the threaded sleeve. One end of each branch is provided with a sliding groove that slides with the corresponding limit strip. A rotating member is provided above the No. 1 conical shell, and the rotating member includes a rotating sleeve and a telescopic rod. A stepped groove is provided inwardly on the top of the third cylindrical valve body. The diameter of the lower half of the stepped groove is smaller than the diameter of the upper half, and the lower half of the stepped groove is connected to the upper end of the narrow groove. A cylindrical sleeve is fixed in the upper half of the stepped groove, and a cylindrical sleeve is embedded in it. Two first sealed bearings are evenly distributed along their axial direction, and the rotating sleeve is fixedly connected to the inner rings of the two first sealed bearings vertically downward, and the lower end of the rotating sleeve extends into the narrow groove, and the upper end of the rotating sleeve extends upward outside the third cylindrical valve body, and the upper end of the rotating sleeve is a closed structure, the telescopic rod is coaxially fixed to the top of the No. 1 conical shell, and the upper end of the telescopic rod is upwardly inserted into the lower end of the rotating sleeve. Two insertion strips evenly distributed along the circumferential direction of the rotating sleeve are formed on the inner wall of the lower end of the rotating sleeve. The length direction of each insertion strip is parallel to the axial direction of the rotating sleeve, and two strip-shaped slots are provided on the outer wall of the upper end of the telescopic rod, which respectively match the two insertion strips.

[0011] Furthermore, the control valve includes a rectangular valve body and a rotary valve pin. A horizontal flow groove and a liquid outlet groove are provided in the rectangular valve body. One end of the horizontal flow groove is connected to the drainage groove. The liquid outlet groove is vertical and its upper end is connected to the other end of the horizontal flow groove. The lower end of the liquid outlet groove penetrates the bottom of the rectangular valve body to form a liquid outlet. A rotating groove is provided on the rectangular valve body, which horizontally passes through the middle section of the horizontal flow groove. The rotary valve pin rotates in the rotating groove. A second sealing bearing is provided in the rotating groove for the rotation of the rotary valve pin and to prevent the entry and exit of gas. The rotary valve pin has two liquid-passing gaps evenly distributed along the circumferential direction of the rotary valve pin.

[0012] Furthermore, the outer circumference of the liquid storage glass tube is provided with several support rods evenly distributed along the circumferential direction of the liquid storage glass tube, the upper end of each support rod is upwardly in conflict with the bottom of the second cylindrical valve body, and the lower end of each support rod is downwardly in conflict with the conflict of the first cylindrical valve body, and the upper and lower ends of each support rod are distributed with a No. 1 connecting rod and a No. 2 connecting rod, the No. 1 connecting rod upwardly connects the second cylindrical valve body and the third cylindrical valve body, and the No. 1 connecting rod is downwardly fixedly connected to the first cylindrical valve body, and a transparent cover mounted on the outside of the several support rods is fixedly provided between the first cylindrical valve body and the second cylindrical valve body, the upper end of the liquid storage glass tube is fixedly connected to the bottom of the second cylindrical valve body, and the lower end of the liquid storage glass tube extends downward into the upper half of the liquid inlet tank.

[0013] Furthermore, two arc-shaped guide slides are embedded on the outer wall of the annular floating plate and are evenly distributed along the circumference of the annular floating plate. Each arc-shaped guide slide fits the inner wall of the liquid storage glass tube.

[0014] A method for using an automatic sampling system for a chemical reactor, comprising the following steps:

[0015] S1, evacuate the negative pressure tank and turn the rotary valve pin to test whether the horizontal flow tank is closed;

[0016] S2, rotate the sleeve and observe the position of the threaded sleeve in the liquid storage glass tube through the transparent cover to control the distance between the threaded sleeve and the annular floating plate;

[0017] S3, inserting the sampling tube downward into the reactor to extract the liquid;

[0018] S4. Observe through the transparent cover whether the liquid level in the liquid storage glass tube rises. When the liquid level stops rising, turn the rotary valve pin to discharge the liquid and collect and sample the discharged liquid.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] First, the device automatically controls the opening and closing of two valves through a buoyancy opening and closing assembly. This allows the negative pressure suction to close the negative pressure tank when the liquid level in the liquid storage glass tube rises to a certain level, while simultaneously closing the liquid inlet tank for upward liquid flow. This ultimately ensures that the liquid remains suspended in the liquid storage glass tube. This process eliminates the need for manual intervention and the potential for leaks caused by manually closing the valves, further improving the efficiency of liquid sampling.

[0021] Secondly, during the entire sampling process, the operator only needs to control the discharge of the liquid through the control valve, and the control valve of the device can control the speed of liquid discharge to prevent the liquid from overflowing the collection bottle due to rapid discharge;

[0022] Third, the amount of liquid drawn into the liquid storage glass tube each time needs to be determined according to the sampling amount. After the sampling is completed, if a large amount of liquid remains in the liquid storage glass tube, then this part of the liquid can only be returned to the reactor again, which will cause a waste of the sample. Therefore, the rotating part of the device is used to adjust the vertical position of the threaded sleeve located in the liquid storage glass tube, and finally the amount of liquid flowing into the liquid storage glass tube is controlled by changing the distance between the threaded sleeve and the annular floating plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment;

[0024] Figure 2 is a top view of an embodiment;

[0025] Figure 3 yes Figure 2 Sectional view along line AA;

[0026] Figure 4 yes Figure 3 A1 is a partial enlarged schematic diagram;

[0027] Figure 5 yes Figure 3 A2 is a partial enlarged schematic diagram;

[0028] Figure 6 yes Figure 2 Cross-sectional view along line BB;

[0029] Figure 7 yes Figure 2 Cross-sectional view along line CC;

[0030] Figure 8 1. It is a three-dimensional structural exploded view of the second cylindrical valve body, the third cylindrical valve body and the liquid storage glass tube of the embodiment;

[0031] Figure 9 yes Figure 8 A3 is a partial enlarged schematic diagram;

[0032] Figure 10 This is a three-dimensional exploded view of the cylindrical sleeve and the third cylindrical valve body of the embodiment;

[0033] Figure 11 1 is a schematic diagram of the three-dimensional structure of the rotating sleeve of the embodiment;

[0034] Figure 12 This is a three-dimensional exploded view of the buoyancy opening and closing assembly and the liquid storage glass tube of the embodiment;

[0035] Figure 13 3D is a schematic diagram of the three-dimensional structure of the sampling tube of the embodiment.

[0036] The numbers in the figure are: 1, sampling tube; 2, first cylindrical valve body; 3, liquid storage glass tube; 4, second cylindrical valve body; 5, third cylindrical valve body; 6, liquid inlet groove; 7, liquid discharge groove; 8, through groove; 9, vent groove; 10, connecting groove; 11, negative pressure groove; 12, annular floating plate; 13, vertical rod; 14, limiting ring; 15, limiting plate; 16, conical groove; 17, narrow groove; 18, cylindrical shell; 19, conical shell No. 1; 20, conical shell No. 2; 21, vent hole; 22, sealing circular plate; 23, circular groove; 24, horizontal connecting strip; 25, circular ring; 26, liquid inlet; 27. Strip-shaped ventilation groove; 28. Limiting strip; 29. ​​Limiting groove; 30. Threaded sleeve; 31. Support bar; 32. Slide groove; 33. Rotating sleeve; 34. Telescopic rod; 35. Step groove; 36. Columnar sleeve; 37. First sealing bearing; 38. Insert; 39. Strip-shaped slot; 40. Rectangular valve body; 41. Rotating valve pin; 42. Horizontal flow groove; 43. Liquid outlet groove; 44. Liquid outlet; 45. Rotating groove; 46. Second sealing bearing; 47. Liquid passage gap; 48. Support rod; 49. Connecting rod No. 1; 50. Connecting rod No. 2; 51. Transparent cover; 52. Arc-shaped guide strip. DETAILED DESCRIPTION

[0037] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] refer to Figures 1 to 13The automatic sampling system of a chemical reactor described herein comprises a sampling tube 1, a first cylindrical valve body 2, a liquid storage glass tube 3, a second cylindrical valve body 4 and a third cylindrical valve body 5 which are coaxially connected end to end and distributed in sequence from bottom to top in the vertical direction. A liquid inlet groove 6 is coaxially provided in the first cylindrical valve body 2, and a liquid discharge groove 7 which is horizontal and connected to the liquid inlet groove 6 is provided on the outer wall of the first cylindrical valve body 2. A through groove 8 is coaxially provided in the second cylindrical valve body 4, and a ventilation groove 9 which is horizontal and connected to the through groove 8 is provided on the outer wall of the second cylindrical valve body 4. A connecting groove 10 is coaxially provided in the third cylindrical valve body 5, and a negative pressure groove 11 which is horizontal and connected to the connecting groove 10 is provided on the outer wall of the third cylindrical valve body 5. The upper end of the sampling tube 1 is connected to the lower end of the liquid inlet groove 6, and the upper and lower ends of the liquid storage glass tube 3 are respectively connected to the lower end of the through groove 8 and the upper end of the liquid inlet groove 6. The upper end of the through groove 8 is connected to the lower end of the connecting groove 10. The ends are connected, a control valve for opening and closing the drain tank 7 is provided on the outer wall of the first cylindrical valve body 2, and a buoyancy opening and closing component is provided in the liquid storage glass tube 3. The buoyancy opening and closing component includes an annular floating plate 12, an upper blocking body, a lower blocking body, a resistance member and a limit mechanism. The upper blocking body and the lower blocking body are connected by a vertical rod 13. The resistance member is provided on the vertical rod 13, and the resistance member is located above the annular floating plate 12. The annular floating plate 12 slides in the liquid storage glass tube 3, and the movable sleeve Located on the vertical rod 13, the limiting mechanism includes a limiting ring 14 and a limiting plate 15. The limiting ring 14 is formed in the liquid storage glass tube 3, and the limiting ring 14 is used to limit the downward movement of the annular floating plate 12. The limiting plate 15 is formed in the upper end of the sampling tube 1, and the limiting plate 15 is used to limit the downward movement of the lower blocking body. The annular floating plate 12 and the upper blocking body are both hollow structures. The upper blocking body is used to open and close the ventilation groove 9 and the negative pressure groove 11, and the lower blocking body is used to open and close the liquid inlet groove 6.

[0039] The negative pressure groove 11 on the third cylindrical valve body 5 of this device is connected to an external negative pressure source (not shown in the figure). In the initial state, the annular floating plate 12 slides downward by its own weight and is limited by the limiting ring 14, so that the annular floating plate 12 is located in the lower end of the liquid storage glass tube 3. The upper blocking body and the lower blocking body are connected to each other by the vertical rod 13. The lower blocking body slides downward by its own weight and is limited by the limiting plate 15. As a result, the liquid inlet groove 6 in the first cylindrical valve body 2 is in an open state, and the vent groove 9 in the second cylindrical valve body 4 is blocked by the upper blocking body and is in a closed state. , the negative pressure groove 11 in the third cylindrical valve body 5 is in the open state, and the current drainage groove 7 is closed by the control valve. Then the sampling tube 1 is inserted downward into the reactor, and the external negative pressure source connected to the negative pressure groove 11 is started. Since the ventilation groove 9 and the drainage groove 7 have been closed at this time, a closed negative pressure space will be formed in the through groove 8, the connecting groove 10, the liquid storage glass tube 3, the liquid inlet groove 6 and the sampling tube 1. After that, the liquid will be extracted by the sampling tube 1. During this process, the liquid is discharged upward through the liquid inlet groove 6 into the liquid storage glass tube 3, so the liquid storage glass tube 3 The liquid level in the liquid storage glass tube 3 will gradually rise, so the annular float 12 located in the lower end of the liquid storage glass tube 3 will be affected by the buoyancy of the liquid and move upward. Then, when the annular float 12 moves upward and contacts the resistance member, the annular float 12 will drive the resistance member to rise together, and the resistance member will drive the entire vertical rod 13 to rise. Finally, the upper blocking body and the lower blocking body will rise synchronously. In this process, the upper blocking body will close the negative pressure groove 11 and open the ventilation groove 9 at the same time, and the lower blocking body will close the liquid inlet groove 6. When the upper blocking body closes the negative pressure groove 11, the upper blocking body will be closed by the negative pressure groove 11. The generated buoyancy suction sucks, thereby making the lower blocking body connected to the upper blocking body through the vertical rod 13 temporarily fixed, ensuring that the lower blocking body can always close the liquid inlet tank 6 during the current period. When the negative pressure tank 11 and the liquid inlet tank 6 are closed, the liquid in the liquid storage glass tube 3 will be suspended in the liquid storage glass tube 3. Therefore, when the ventilation tank 9 is opened, the larger external air pressure will press the liquid in the liquid storage glass tube 3 downward. At this time, the liquid in the liquid storage glass tube 3 can be discharged by opening the drain tank 7 through the control valve, and finally the liquid in the reactor can be sampled.

[0040] When sampling is completed, the annular floating plate 12 will drop to the initial state along with the liquid level in the liquid storage glass tube 3. After that, the external negative pressure source will be closed, so that the upper blocking body, vertical rod 13 and lower blocking body will drop by their own weight until the lower blocking body is limited by the limiting plate 15 again.

[0041] In order to show the specific structure of the upper blocking body, the following features are set:

[0042] The connecting groove 10 is divided into a tapered groove 16 and a narrow groove 17 from bottom to top. The small diameter end of the tapered groove 16 faces upward, and the large diameter end of the tapered groove 16 is connected to the upper end of the through groove 8. The narrow groove 17 is vertical and its lower end is connected to the small diameter end of the tapered groove 16. The negative pressure groove 11 is connected to the upper end of the narrow groove 17. The diameter of the ventilation groove 9 is smaller than the diameter of the through groove 8. The upper blocking body is a cylindrical shell 18 that slides in the through groove 8. The cylindrical shell 1 8 has an outer diameter consistent with the diameter of the through groove 8. The upper end of the cylindrical shell 18 tapers upward to form a conical shell 19 that fits with the conical groove 16. The lower end of the cylindrical shell 18 tapers downward to form a second conical shell 20. The circumferential surface of the No. 1 conical shell 19 is provided with air holes 21 evenly distributed along its circumferential direction. The upper end of the vertical rod 13 passes through the No. 2 conical shell 20 and the cylindrical shell 18 upward in sequence and is coaxially fixed to the bottom of the No. 1 conical shell 19.

[0043] In the initial state, when the lower blocking body touches the limit plate 15 downward, the cylindrical shell 18 will close the opening connecting the vent groove 9 and the through groove 8, and the No. 1 conical shell 19 will separate downward from the conical groove 16. Then, when the negative pressure groove 11 generates negative pressure suction, the narrow groove 17 and the conical groove 16 will have negative pressure suction. At this time, the gas in the sampling tube 1 will move upward, and after passing through the liquid storage glass tube 3, the gas will pass through the entire upper blocking body upward and be discharged from several air holes 21. At the same time, the liquid will enter the liquid storage glass tube 3 along the sampling tube 1, and the annular float 12 will rise due to the buoyancy. When the annular float 12 touches the resistance piece upward, the vertical rod 13 will drive the upper blocking body and the lower blocking body to rise synchronously. In this process, the No. 1 conical shell 19 will move upward toward the conical groove 16, the cylindrical shell 18 will slide upward in the through groove 8, and the No. 2 conical shell 2 0 will move upward toward the vent groove 9, then when the No. 1 conical shell 19 gradually approaches the conical groove 16 upward, the No. 2 conical shell 20 will gradually approach the vent groove 9, so that the opening connected to the vent groove 9 and the through groove 8 will be gradually opened. Finally, when the No. 1 conical shell 19 is completely fitted on the conical groove 16 upward, the opening connected to the vent groove 9 and the through groove 8 will be completely opened. At this time, the top of the No. 1 conical shell 19 will block the opening at the lower end of the narrow groove 17, and the No. 1 conical shell 19 will be adsorbed in the conical groove 16 by the negative pressure suction force, thereby cutting off the negative pressure of the extracted liquid, and at the same time, the lower blocking body will be in a fixed state, closing the liquid inlet groove 6 through the lower blocking body, and the liquid inlet groove 6 and the narrow groove 17 are closed at the same time. When the vent groove 9 is opened, the external air pressure will enter the liquid storage glass tube 3 through the through groove 8, thereby pressing the liquid in the liquid storage glass tube 3 downward;

[0044] As the first conical shell 19 gradually moves upwards towards the conical groove 16, the opening connecting the vent groove 9 and the through groove 8 will gradually open, so that a small amount of air from the outside will flow into the through groove 8. However, at this time, the negative pressure groove 11 has not yet been closed, and there is still a large suction force in the conical groove 16. Therefore, the outside air at this time will not affect the upward extraction of the liquid;

[0045] The upper blocking body, the lower blocking body and the vertical rod 13 are all made of light materials so that they can be driven upward by the annular floating plate 12. Then, when the negative pressure groove 11 generates suction, since the upper blocking body is provided with an air vent 21, the upward moving gas will be discharged from the air vent 21. Therefore, in the initial state, the upper blocking body is difficult to move upward by itself due to the negative pressure suction generated by the negative pressure groove 11.

[0046] In order to show the specific structure of the lower blocking body and the installation method of the limit plate 15, the following features are set:

[0047] The lower blocking body is a sealing circular plate 22. The upper half of the liquid inlet groove 6 is cylindrical, and its lower half is flared. The upper end of the sampling tube 1 is connected to the lower half of the liquid inlet groove 6. The limiting plate 15 is circular and its outer diameter is smaller than the inner diameter of the sampling tube 1. The top of the limiting plate 15 is provided with a circular groove 23 that is recessed downward and used to accommodate the sealing circular plate 22. A circle of horizontal connecting strips 24 uniformly distributed along the circumferential direction of the limiting plate 15 is provided between the limiting plate 15 and the sampling tube 1. The two ends of each horizontal connecting strip 24 are respectively connected to the outer wall of the limiting plate 15 and the inner wall of the sampling tube 1. A circular ring 25 is coaxially formed in the upper half of the liquid inlet groove 6. The center of the circular ring 25 is the liquid inlet 26. The lower end of the vertical rod 13 passes downward through the liquid inlet 26 and is coaxially fixed to the top of the sealing circular plate 22.

[0048] In the initial state, the sealing circular plate 22 is located in the circular groove. When the liquid is extracted, the liquid will first pass through the sampling tube 1, and then the liquid will be discharged into the lower half of the liquid inlet groove 6 through the gap between the adjacent horizontal connecting strips 24. The liquid entering the lower half of the liquid inlet groove 6 will be discharged into the upper half of the liquid inlet groove 6 through the liquid inlet port 26 in the center of the ring 25. Finally, the liquid will enter the liquid storage glass tube 3 through the upper half of the liquid inlet groove 6.

[0049] In order to specifically demonstrate the sliding connection between the annular floating plate 12 and the liquid storage glass tube 3, the following features are set:

[0050] The annular floating plate 12 is a hollow structure. It is provided with a number of strip-shaped air-permeable grooves 27 evenly distributed along the circumferential direction of the annular floating plate 12. Two limit strips 28 evenly distributed along the circumferential direction of the liquid storage glass tube 3 are formed on the inner wall of the liquid storage glass tube 3. The length direction of each limit strip 28 is parallel to the axial direction of the liquid storage glass tube 3. Two limit slots 29 are provided on the circumferential wall of the annular floating plate 12, which are respectively slidably engaged with the two limit strips 28.

[0051] Through the cooperation between the limiting groove 29 on the annular float plate 12 and the limiting strip 28 on the inner wall of the liquid storage glass tube 3, the annular float plate 12 can only move in the vertical direction after being pushed by buoyancy. The multiple strip-shaped air-permeable grooves 27 provided on the annular float plate 12 are used for gas to flow through, ensuring that after the negative pressure tank 11 generates negative pressure suction, the upward flowing gas can pass through the annular float plate 12. When the annular float plate 12 is lifted by the buoyancy of the liquid, due to the certain density and surface tension of the liquid, the liquid will always be located below the annular float plate 12 and will not surge upward through the multiple strip-shaped air-permeable grooves 27.

[0052] In order to show the structure of the interference piece and to be able to adjust the distance between the interference piece and the annular floating plate 12, the following features are provided:

[0053] The middle section of the vertical rod 13 is a threaded structure, and the interference member is a threaded sleeve 30 screwed on the middle section of the vertical rod 13. Two branches 31 are formed on the outer wall of the threaded sleeve 30 and are evenly distributed along the circumferential direction of the threaded sleeve 30. One end of each branch 31 is provided with a slide groove 32 that slides with the corresponding limit strip 28. A rotating member is provided above the No. 1 conical shell 19. The rotating member includes a rotating sleeve 33 and a telescopic rod 34. A stepped groove 35 is provided inwardly at the top of the third cylindrical valve body 5. The diameter of the lower half of the stepped groove 35 is smaller than the diameter of the upper half, and the lower half of the stepped groove 35 is connected to the upper end of the narrow groove 17. A cylindrical sleeve 36 is fixed in the upper half of the stepped groove 35, and two cylindrical sleeves 36 are embedded in the cylindrical sleeve 36. The first sealed bearings 37 are evenly distributed in the axial direction, and the rotating sleeve 33 is fixedly connected vertically downward to the inner rings of the two first sealed bearings 37, and the lower end of the rotating sleeve 33 extends into the narrow groove 17, and the upper end of the rotating sleeve 33 extends upward outside the third cylindrical valve body 5, and the upper end of the rotating sleeve 33 is a closed structure, the telescopic rod 34 is coaxially fixedly connected to the top of the No. 1 conical shell 19, and the upper end of the telescopic rod 34 is inserted upward into the lower end of the rotating sleeve 33. Two insertion strips 38 are evenly distributed along the circumferential direction of the rotating sleeve 33 on the inner wall of the lower end of the rotating sleeve 33. The length direction of each insertion strip 38 is parallel to the axial direction of the rotating sleeve 33, and two bar-shaped slots 39 are provided on the outer wall of the upper end of the telescopic rod 34, which respectively cooperate with the two insertion strips 38.

[0054] The amount of liquid drawn into the liquid storage glass tube 3 each time needs to be determined according to the sampling amount. After the sampling is completed, if a large amount of liquid remains in the liquid storage glass tube 3, then this part of the liquid can only be returned to the reactor again, which will cause a waste of the sample. Therefore, it is necessary to control the amount of liquid entering the liquid storage glass tube 3;

[0055] When the annular float 12 is lifted by the buoyancy of the liquid, it will rise a certain distance before contacting the resistance member. Only then will the resistance member drive the vertical rod 13 upward. The rising vertical rod 13 will drive the upper and lower blocking bodies upward. After that, the liquid inlet tank 6 and the negative pressure tank 11 will be closed, and finally the liquid will be suspended in the liquid storage glass tube 3. In this way, the amount of liquid entering the liquid storage glass tube 3 can be controlled by changing the distance between the resistance member and the annular float 12.

[0056] When the rotating sleeve 33 is manually rotated, the rotating sleeve 33 drives the telescopic rod 34 to rotate through the cooperation of the insertion strip 38 and the strip-shaped slot 39. The telescopic rod 34 drives the first conical shell 19 to rotate, thereby driving the first conical shell 19 to rotate the vertical rod 13. After the vertical rod 13 rotates, it drives the threaded sleeve 30 that cooperates with the middle thread of the vertical rod 13 to rotate. Because the threaded sleeve 30 is restricted in rotation by the two support bars 31, the threaded sleeve 30 can only move up and down along the axial direction of the vertical rod 13, thereby adjusting the distance between the threaded sleeve 30 and the annular floating plate 12. Ultimately, the amount of liquid flowing into the liquid storage glass tube 3 is controlled by changing the distance between the threaded sleeve 30 and the annular floating plate 12.

[0057] In the initial state, the sealing circular plate 22 is located in the circular groove 23. At this time, the upper end of the telescopic rod 34 is inserted into the lower end of the rotating sleeve 33. Then, when the annular floating plate 12 contacts the threaded sleeve 30 and drives the vertical rod 13 to rise, the upper blocking body will rise, thereby driving the telescopic rod 34 upward and gradually inserting it into the rotating sleeve 33, ultimately ensuring that the rotating sleeve 33 can always drive the telescopic rod 34 to rotate.

[0058] In order to show the specific structure of the control valve, the following features are set:

[0059] The control valve includes a rectangular valve body 40 and a rotary valve pin 41. A horizontal flow groove 42 and a liquid outlet groove 43 are provided in the rectangular valve body 40. One end of the horizontal flow groove 42 is connected to the drainage groove 7. The liquid outlet groove 43 is vertical and its upper end is connected to the other end of the horizontal flow groove 42. The lower end of the liquid outlet groove 43 penetrates the bottom of the rectangular valve body 40 to form a liquid outlet 44. A rotating groove 45 is provided on the rectangular valve body 40, which runs horizontally through the middle section of the horizontal flow groove 42. The rotary valve pin 41 rotates in the rotating groove 45. A second sealing bearing 46 is provided in the rotating groove 45 for allowing the rotary valve pin 41 to rotate and preventing gas from entering and exiting. The rotary valve pin 41 is provided with two liquid-passing notches 47 evenly distributed along the circumferential direction of the rotary valve pin 41.

[0060] like Figure 3As shown, the horizontal flow channel 42 is divided into two sections by the rotating channel 45. When the rotary valve pin 41 is rotated until the two liquid-passing notches 47 face the two sub-channels respectively, the rotary valve pin 41 will block the entire horizontal flow channel 42, so that the liquid in the liquid storage glass tube 3 cannot flow through the horizontal flow channel 42 to the liquid outlet channel 43. When the rotary valve pin 41 is gradually rotated, the liquid in the liquid storage glass tube 3 will flow from the first section of the sub-channel to the second section of the sub-channel through the two liquid-passing notches 47, and finally the liquid will flow out of the liquid outlet channel 43. Then, a sampling bottle can be screwed onto the liquid outlet 44 to collect the discharged liquid.

[0061] Before inserting the sampling tube 1 downward into the reactor, start the external negative pressure source first. At this time, turn the rotary valve pin 41 and touch the liquid outlet 44 by hand to see if there is negative pressure suction to determine whether the current rotary valve pin 41 blocks the horizontal flow channel 42. If the liquid outlet 44 does not have negative pressure suction at this time, insert the sampling tube 1 downward into the reactor.

[0062] In order to specifically demonstrate the end-to-end connection method of the sampling tube 1, the first cylindrical valve body 2, the liquid storage glass tube 3, the second cylindrical valve body 4 and the third cylindrical valve body 5, the following features are specifically set:

[0063] The outer periphery of the liquid storage glass tube 3 is provided with several support rods 48 evenly distributed along the circumferential direction of the liquid storage glass tube 3, the upper end of each support rod 48 is upwardly in conflict with the bottom of the second cylindrical valve body 4, and the lower end of each support rod 48 is downwardly in conflict with the first cylindrical valve body 2, and the upper and lower ends of each support rod 48 are distributed with a No. 1 connecting rod 49 and a No. 2 connecting rod 50. The No. 1 connecting rod 49 upwardly connects the second cylindrical valve body 4 and the third cylindrical valve body 5, and the No. 1 connecting rod 49 is downwardly fixedly connected to the first cylindrical valve body 2, and a transparent cover 51 is fixedly provided between the first cylindrical valve body 2 and the second cylindrical valve body 4. The upper end of the liquid storage glass tube 3 is fixedly connected to the bottom of the second cylindrical valve body 4, and the lower end of the liquid storage glass tube 3 extends downward into the upper half of the liquid inlet tank 6.

[0064] A plurality of support rods 48 are used to support the second cylindrical valve body 4 and the third cylindrical valve body 5 above the liquid storage glass tube 3 to prevent the liquid storage glass tube 3 from being crushed by the weight of the second cylindrical valve body 4 and the third cylindrical valve body 5;

[0065] The transparent cover 51 is used to protect the liquid storage glass tube 3 and prevent the liquid storage glass tube 3 from being damaged or broken by external forces.

[0066] In order to reduce the friction between the annular floating plate 12 and the inner wall of the liquid storage glass tube 3 when it rises, the following features are specifically set:

[0067] Two arc-shaped guide slides 52 evenly distributed along the circumference of the annular floating plate 12 are embedded on the outer wall of the annular floating plate 12 , and each arc-shaped guide slide 52 fits against the inner wall of the liquid storage glass tube 3 .

[0068] The two arc-shaped guide slides 52 are used to reduce the friction between the rising annular floating plate 12 and the inner wall of the liquid storage glass tube 3, ensuring that the annular floating plate 12 can rise stably after being subjected to buoyancy.

[0069] A method for using an automatic sampling system for a chemical reactor, comprising the following steps:

[0070] S1, evacuate the negative pressure tank 11 and rotate the rotary valve pin 41 to test whether the horizontal flow tank 42 is closed;

[0071] Before inserting the sampling tube 1 downward into the reactor, start the external negative pressure source first. At this time, turn the rotary valve pin 41 and touch the liquid outlet 44 by hand to see if there is negative pressure suction to determine whether the current rotary valve pin 41 blocks the horizontal flow channel 42. If the liquid outlet 44 does not have negative pressure suction at this time, insert the sampling tube 1 downward into the reactor.

[0072] S2, rotating the sleeve 33, observing the position of the threaded sleeve 30 in the liquid storage glass tube 3 through the transparent cover 51, thereby controlling the distance between the threaded sleeve 30 and the annular floating plate 12;

[0073] The amount of liquid drawn into the liquid storage glass tube 3 each time needs to be determined according to the sampling volume. After the sampling is completed, if a large amount of liquid remains in the liquid storage glass tube 3, then this part of the liquid can only be returned to the reactor again, which will cause a waste of the sample. Therefore, it is necessary to control the amount of liquid entering the liquid storage glass tube 3;

[0074] When the annular float 12 is lifted by the buoyancy of the liquid, it will rise a certain distance before contacting the resistance member. Only then will the resistance member drive the vertical rod 13 upward. The rising vertical rod 13 will drive the upper and lower blocking bodies upward. After that, the liquid inlet tank 6 and the negative pressure tank 11 will be closed, and finally the liquid will be suspended in the liquid storage glass tube 3. In this way, the amount of liquid entering the liquid storage glass tube 3 can be controlled by changing the distance between the resistance member and the annular float 12.

[0075] When the rotating sleeve 33 is manually rotated, the rotating sleeve 33 will drive the telescopic rod 34 to rotate through the cooperation of the insertion strip 38 and the bar-shaped slot 39. The telescopic rod 34 will drive the No. 1 conical shell 19 to rotate, thereby the No. 1 conical shell 19 will drive the vertical rod 13 to rotate. After the vertical rod 13 rotates, it will drive the threaded sleeve 30 that cooperates with the middle thread of the vertical rod 13 to rotate. Since the threaded sleeve 30 is restricted in rotation by the two support bars 31, the threaded sleeve 30 can only move up and down along the axial direction of the vertical rod 13, so as to adjust the distance between the threaded sleeve 30 and the annular floating plate 12. Finally, the amount of liquid flowing into the liquid storage glass tube 3 is controlled by changing the distance between the threaded sleeve 30 and the annular floating plate 12.

[0076] S3, inserting the sampling tube 1 downward into the reactor to extract the liquid;

[0077] The liquid in the reactor is discharged upward into the liquid storage glass tube 3, and after contacting the annular floating plate 12, it drives the annular floating plate 12 upward. After the annular floating plate 12 rises and conflicts with the threaded sleeve 30, the threaded sleeve 30 will drive the vertical rod 13 to rise. After the vertical rod 13 rises, it will drive the upper and lower blocking bodies to rise. In this process, the No. 1 conical shell 19 will move upward toward the conical groove 16, the cylindrical shell 18 will slide upward in the through groove 8, and the No. 2 conical shell 20 will move upward toward the vent groove 9. Then, when the No. 1 conical shell 19 gradually approaches the conical groove 16 upward, the No. 2 conical shell 20 will gradually approach the vent groove 9, thereby opening the vent groove 9 and the through groove 8. The opening will be gradually opened, and finally, when the No. 1 conical shell 19 is completely fitted upward on the conical groove 16, the opening connecting the vent groove 9 and the through groove 8 will be completely opened. At this time, the top of the No. 1 conical shell 19 will block the opening at the lower end of the narrow groove 17, and the No. 1 conical shell 19 will be adsorbed in the conical groove 16 by the negative pressure suction, thereby cutting off the negative pressure of the extracted liquid, and at the same time, the lower blocking body will be in a fixed state, and the liquid inlet groove 6 will be closed by the lower blocking body, and the liquid inlet groove 6 and the narrow groove 17 will be closed at the same time. When the vent groove 9 is opened, the external air pressure will enter the liquid storage glass tube 3 through the through groove 8, thereby pressing the liquid in the liquid storage glass tube 3 down to the horizontal flow groove 42.

[0078] S4, observe through the transparent cover 51 whether the liquid level in the liquid storage glass tube 3 rises. When the liquid level stops rising, rotate the rotary valve pin 41 to discharge the liquid, and collect and sample the discharged liquid.

[0079] The horizontal flow trough 42 will be divided into two sub-troughs by the rotating trough 45. When the rotary valve pin 41 is rotated until the two liquid-passing notches 47 are respectively facing the two sub-troughs, the rotary valve pin 41 will block the entire horizontal flow trough 42, so that the liquid in the liquid storage glass tube 3 cannot flow to the liquid outlet trough 43 through the horizontal flow trough 42. When the rotary valve pin 41 is gradually rotated, the liquid in the liquid storage glass tube 3 will flow from the first sub-trough to the second sub-trough through the two liquid-passing notches 47, and finally the liquid will flow out of the liquid outlet trough 43. Then, a sampling bottle can be screwed on the liquid outlet 44 to collect the discharged liquid.

[0080] The above embodiments merely represent one or several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A chemical reactor automatic sampling system, characterized in that: The invention comprises a sampling tube (1), a first cylindrical valve body (2), a liquid storage glass tube (3), a second cylindrical valve body (4) and a third cylindrical valve body (5) which are coaxially connected end to end and are arranged in sequence from bottom to top in the vertical direction, wherein a liquid inlet groove (6) is coaxially provided in the first cylindrical valve body (2), a liquid discharge groove (7) which is horizontal and connected to the liquid inlet groove (6) is provided on the outer wall of the first cylindrical valve body (2), a through groove (8) is coaxially provided in the second cylindrical valve body (4), and a liquid discharge groove (7) which is horizontal and connected to the liquid inlet groove (6) is provided on the outer wall of the second cylindrical valve body (4). A ventilation groove (9) is horizontal and connected to the through groove (8), a connecting groove (10) is coaxially provided in the third cylindrical valve body (5), and a negative pressure groove (11) is provided on the outer wall of the third cylindrical valve body (5) and is horizontal and connected to the connecting groove (10). The upper end of the sampling tube (1) is connected to the lower end of the liquid inlet groove (6), and the upper and lower ends of the liquid storage glass tube (3) are respectively connected to the lower end of the through groove (8) and the upper end of the liquid inlet groove (6), and the upper end of the through groove (8) is connected to the lower end of the connecting groove (10). A control valve for opening and closing the liquid drain tank (7) is provided on the outer wall of the first cylindrical valve body (2), and a buoyancy opening and closing assembly is provided in the liquid storage glass tube (3). The buoyancy opening and closing assembly includes an annular floating plate (12), an upper blocking body, a lower blocking body, a resistance member and a limit mechanism. The upper blocking body and the lower blocking body are connected through a vertical rod (13). The resistance member is provided on the vertical rod (13), and the resistance member is located above the annular floating plate (12). The annular floating plate (12) slides in the liquid storage glass tube (3) and is movably sleeved on the vertical rod (13). ), the limiting mechanism includes a limiting ring (14) and a limiting plate (15), the limiting ring (14) is formed in the liquid storage glass tube (3), and the limiting ring (14) is used to limit the downward movement of the annular floating plate (12), the limiting plate (15) is formed in the upper end of the sampling tube (1), and the limiting plate (15) is used to limit the downward movement of the lower blocking body, the annular floating plate (12) and the upper blocking body are both hollow structures, the upper blocking body is used to open and close the ventilation groove (9) and the negative pressure groove (11), and the lower blocking body is used to open and close the liquid inlet groove (6); The upper blocking body is a cylindrical shell (18) that slides in the through groove (8). The outer diameter of the cylindrical shell (18) is consistent with the diameter of the through groove (8). The upper end of the cylindrical shell (18) tapers upward to form a first conical shell (19) that fits the conical groove (16). The lower end of the cylindrical shell (18) tapers downward to form a second conical shell (20). The circumference of the first conical shell (19) is provided with air holes (21) evenly distributed along its circumferential direction. Two limiting strips (28) are formed on the inner wall of the liquid storage glass tube (3) and are evenly distributed along the circumferential direction of the liquid storage glass tube (3); The middle section of the vertical rod (13) is a threaded structure, and the resistance member is a threaded sleeve (30) screwed on the middle section of the vertical rod (13). Two branches (31) are formed on the outer wall of the threaded sleeve (30) and are evenly distributed along the circumferential direction of the threaded sleeve (30). One end of each branch (31) is provided with a slide groove (32) that slides with the corresponding limit strip (28). A rotating member is provided above the No. 1 conical shell (19), and the rotating member includes a rotating sleeve (33) and a telescopic rod (34). A stepped groove (35) is provided inwardly at the top of the third cylindrical valve body (5). The diameter of the lower half of the stepped groove (35) is smaller than the diameter of the upper half thereof, and the lower half of the stepped groove (35) is connected to the upper end of the narrow groove (17). A columnar sleeve (36) is fixed in the upper half of the stepped groove (35), and two columns are embedded in the columnar sleeve (36). The first sealing bearings (37) are evenly distributed in the axial direction, the rotating sleeve (33) is fixedly connected vertically downward with the inner rings of the two first sealing bearings (37), and the lower end of the rotating sleeve (33) extends into the narrow groove (17), the upper end of the rotating sleeve (33) extends upward outside the third cylindrical valve body (5), and the upper end of the rotating sleeve (33) is a closed structure, the telescopic rod (34) is coaxially fixedly connected to the top of the first conical shell (19), the upper end of the telescopic rod (34) is inserted upward into the lower end of the rotating sleeve (33), and two insertion strips (38) evenly distributed along the circumferential direction of the rotating sleeve (33) are formed on the inner wall of the lower end of the rotating sleeve (33), and the length direction of each insertion strip (38) is parallel to the axial direction of the rotating sleeve (33). The outer wall of the upper end of the telescopic rod (34) is provided with two strip-shaped slots (39) respectively matched with the two insertion strips (38).

2. The automatic sampling system for chemical reactors according to claim 1, characterized in that: The connecting groove (10) is divided into a tapered groove (16) and a narrow groove (17) from bottom to top, the small-diameter end of the tapered groove (16) faces upward, the large-diameter end of the tapered groove (16) is connected to the upper end of the through groove (8), the narrow groove (17) is vertical and its lower end is connected to the small-diameter end of the tapered groove (16), the negative pressure groove (11) is connected to the upper end of the narrow groove (17), the diameter of the vent groove (9) is smaller than the diameter of the through groove (8), and the upper end of the vertical rod (13) passes through the second tapered shell (20) and the cylindrical shell (18) upward and is coaxially fixed to the bottom of the first tapered shell (19).

3. The automatic sampling system for chemical reactors according to claim 2, characterized in that: The lower blocking body is a sealing circular plate (22), the upper half of the liquid inlet groove (6) is cylindrical, and the lower half thereof is flared. The upper end of the sampling tube (1) is connected to the lower half of the liquid inlet groove (6). The limiting plate (15) is circular and has an outer diameter smaller than the inner diameter of the sampling tube (1). A circular groove (23) is provided on the top of the limiting plate (15) and is recessed downward and used to accommodate the sealing circular plate (22). A circle is provided between the limiting plate (15) and the sampling tube (1). Horizontal connecting strips (24) are evenly distributed along the circumferential direction of the limiting plate (15), and the two ends of each horizontal connecting strip (24) are respectively connected to the outer wall of the limiting plate (15) and the inner wall of the sampling tube (1). A circular ring (25) is coaxially formed in the upper half of the liquid inlet groove (6), and the center of the circular ring (25) is the liquid inlet (26). The lower end of the vertical rod (13) passes downward through the liquid inlet (26) and is coaxially fixed to the top of the sealing circular plate (22).

4. The automatic sampling system for chemical reactors according to claim 3, characterized in that: The annular floating plate (12) is a hollow structure. A plurality of strip-shaped air-permeable grooves (27) are uniformly distributed along the circumferential direction of the annular floating plate (12). The length direction of each limiting strip (28) is parallel to the axial direction of the liquid storage glass tube (3). Two limiting grooves (29) are respectively slidably matched with the two limiting strips (28) on the peripheral wall of the annular floating plate (12).

5. The automatic sampling system for chemical reactors according to claim 4, characterized in that: The control valve comprises a rectangular valve body (40) and a rotary valve pin (41). A horizontal flow groove (42) and a liquid outlet groove (43) are provided in the rectangular valve body (40). One end of the horizontal flow groove (42) is connected to the liquid drain groove (7). The liquid outlet groove (43) is vertical and its upper end is connected to the other end of the horizontal flow groove (42). The lower end of the liquid outlet groove (43) penetrates the bottom of the rectangular valve body (40) to form a liquid outlet (44). A rotary groove (45) is provided on the rectangular valve body (40) and runs through the middle section of the horizontal flow groove (42). The rotary valve pin (41) rotates in the rotary groove (45). A second sealing bearing (46) is provided in the rotary groove (45) for rotating the rotary valve pin (41) and preventing gas from entering or exiting. The rotary valve pin (41) is provided with two liquid-passing notches (47) evenly distributed along the circumferential direction of the rotary valve pin (41).

6. The automatic sampling system for chemical reactors according to claim 5, characterized in that: The outer periphery of the liquid storage glass tube (3) is provided with a plurality of support rods (48) uniformly distributed along the circumferential direction of the liquid storage glass tube (3), the upper end of each support rod (48) is upwardly opposed to the bottom of the second cylindrical valve body (4), and the lower end of each support rod (48) is downwardly opposed to the first cylindrical valve body (2), and the upper and lower ends of each support rod (48) are distributed to form a No. 1 connecting rod (49) and a No. 2 connecting rod (50), and the No. 1 connecting rod (49) is formed on the upper and lower ends of each support rod (48). ) upwardly connects the second cylindrical valve body (4) and the third cylindrical valve body (5), the second connecting rod (50) is downwardly fixedly connected to the first cylindrical valve body (2), a transparent cover (51) sleeved on the outside of a plurality of support rods (48) is fixedly provided between the first cylindrical valve body (2) and the second cylindrical valve body (4), the upper end of the liquid storage glass tube (3) is fixedly connected to the bottom of the second cylindrical valve body (4), and the lower end of the liquid storage glass tube (3) extends downwardly into the upper half of the liquid inlet tank (6).

7. The automatic sampling system for chemical reactors according to claim 6, characterized in that: Two arc-shaped guide slides (52) are embedded on the outer wall of the annular floating plate (12) and are evenly distributed along the circumferential direction of the annular floating plate (12). Each arc-shaped guide slide (52) is in contact with the inner wall of the liquid storage glass tube (3).

8. A method for using an automatic sampling system for a chemical reactor, comprising the automatic sampling system for a chemical reactor according to claim 7, characterized in that: The method of use includes the following steps: S1, evacuate the negative pressure tank (11) and rotate the rotary valve pin (41) to test whether the horizontal flow tank (42) is closed; S2, rotating the rotating sleeve (33), observing the position of the threaded sleeve (30) in the liquid storage glass tube (3) through the transparent cover (51), thereby controlling the distance between the threaded sleeve (30) and the annular floating plate (12); S3, inserting the sampling tube (1) downward into the reactor to extract the liquid; S4, observe through the transparent cover (51) whether the liquid level in the liquid storage glass tube (3) rises. When the liquid level no longer rises, rotate the rotary valve pin (41) to discharge the liquid, and collect and sample the discharged liquid.

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