Liquid reagent quantitative dropwise adding device for titration experiment

Abstract

The invention discloses a quantitative liquid reagent dropping device for titration experiment, which comprises a dropping cylinder, a dropping pipette fixedly mounted at the bottom of the dropping cylinder, a piston assembly mounted in the dropping cylinder, a rotating cover mounted at the top of the dropping cylinder, a driving assembly mounted on the outer sides of the dropping cylinder and the rotating cover, and a gas adding assembly mounted at the top of the rotating cover, an identification assembly is mounted on the outer side of the dripping barrel; a rotating cover is rotated to rotate reversely, so that a threaded rod moves downwards in a threaded ring, a piston head is driven to move downwards in a dropwise adding barrel, liquid in the dropwise adding barrel is extruded, the liquid needing to be dropwise added is discharged and dropwise added through a liquid dropping pipe, the applied force can be adjusted in a rotating mode, and the rotating device is convenient to operate. And by controlling the rotating force and speed, the pressure stability in the dropping process can be ensured, so that the dropping precision is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of titration experiments, and particularly to a device for quantitatively dropping liquid reagents used in titration experiments. Background Technique

[0002] As a classic and crucial quantitative analysis method in the field of chemical analysis, titration experiments have extremely wide applications in many scientific research, teaching, and industrial detection scenarios. It involves gradually dropping a standard solution of known concentration into the solution to be tested until the chemical reaction reaches the stoichiometric point, and calculating the content of the substance to be tested based on the volume and concentration of the consumed standard solution. Whether it is the determination of pollutant content in water quality and soil in environmental monitoring, the analysis of drug components in the pharmaceutical field, or the detection of food additives and nutritional components in the food industry, titration experiments play an irreplaceable role.

[0003] During the traditional titration process, experimenters usually need to manually squeeze the rubber nipple of the burette or drop the reagent into the target solution through a syringe. When using the rubber nipple to drop the reagent, due to its shape and elasticity, it is difficult to precisely control the dropped volume, resulting in unstable and inaccurate titration results. When using a syringe to drop, although a rough dropped volume can be preset through the syringe, in actual operation, since it is difficult to apply the same force consistently when holding and pressing, the volume dropped each time has a large variability, affecting the titration precision. In addition, the residual liquid inside the syringe will gradually accumulate, further affecting precise dropping. Especially in the case of multiple precise titrations, these residues may significantly affect the final titration result. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for quantitatively dropping liquid reagents used in titration experiments to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A device for quantitatively dropping liquid reagents used in titration experiments, including a dropping cylinder, a dropping tube is fixedly installed at the bottom of the dropping cylinder, a piston assembly is installed inside the dropping cylinder, a rotating cover is installed at the top of the dropping cylinder, a driving assembly is installed on the outer sides of the dropping cylinder and the rotating cover, an air filling assembly is installed at the top of the rotating cover, and a marking assembly is installed on the outer side of the dropping cylinder.

[0006] Preferably, the piston assembly includes a piston head and a threaded ring. A threaded rod is fixedly installed at the top of the piston head, a rotating shaft is fixedly installed at the top of the threaded rod. The outer wall of the piston head is in sealed sliding connection with the inner wall of the dropping cylinder. Two support rods are fixedly installed on the outer side of the threaded ring, and sliding blocks are fixedly installed at the ends of the two support rods away from the threaded ring. The threaded rod is threadedly connected to the inside of the threaded ring.

[0007] Preferably, sliding grooves are formed on both sides of the inner cavity of the dropping cylinder, and the sliding blocks are respectively slidably installed inside the two sliding grooves.

[0008] Preferably, the driving assembly includes a connecting rod and a fixing ring. The connecting rod is clamped and installed at the top of the rotating shaft. A plugging rod is fixedly installed at the bottom of one end of the connecting rod. The fixing ring is fixedly installed on the outer side of the dropping cylinder. A first rotating ring is rotatably installed on the outer side of the fixing ring. A second plugging sleeve is fixedly installed on the outer side of the first rotating ring. The plugging rod is slidably inserted inside the second plugging sleeve.

[0009] Preferably, a first plugging sleeve is fixedly installed on the outer side of the rotating cover, and the plugging rod is slidably inserted inside the first plugging sleeve. A circular through groove is formed inside the rotating cover. The rotating shaft is slidably installed inside the circular through groove. A third rotating ring is rotatably installed at the bottom of the rotating cover. Two limiting pressing strips are symmetrically fixedly installed at the bottom of the third rotating ring. The positions of the two limiting pressing strips respectively correspond to the positions of the two sliding grooves.

[0010] Preferably, a hexagonal clamping groove is formed at the top of the rotating shaft. A hexagonal clamping post is fixedly installed at the bottom of the connecting rod. The specification size of the outer contour of the hexagonal clamping post matches the specification size of the inner contour of the hexagonal clamping groove, and the position of the hexagonal clamping post corresponds to the position of the hexagonal clamping groove.

[0011] Preferably, the air adding assembly includes a placing seat. A plastic airbag is installed inside the placing seat. A pressing ring is slidably installed inside the placing seat. One side of the plastic airbag is communicated with an air inlet pipe, and a first one-way valve is installed inside the air inlet pipe. One side of the plastic airbag is communicated with a second connecting pipe, and the end of the second connecting pipe away from the plastic airbag is communicated with an air delivery pipe.

[0012] Preferably, a first connecting pipe is installed at the top of the connecting rod. An air vent groove is formed inside the hexagonal clamping post, and the air vent groove is communicated with the first connecting pipe. Air outlet grooves are formed inside the rotating shaft, the threaded rod and the piston head. A second one-way valve is installed inside the air outlet groove formed inside the piston head. A cushion block is fixedly installed at the bottom of the piston head.

[0013] Preferably, pressing rods are fixedly installed on both sides of the bottom of the connecting rod, and pressing plates are fixedly installed at the ends of the pressing rods away from the connecting rod, and the pressing plates are located directly above the pressing ring.

[0014] Preferably, the identification component includes a movable ring and a scale line arranged on the outside of the drip barrel, a rotating ring 2 is rotatably installed on the outside of the movable ring, a plug-in sleeve 3 is fixedly installed on the outside of the rotating ring 2, the end of the plug-in rod away from the connecting rod is plugged into the inner side of the plug-in sleeve 3, the end of the plug-in rod away from the connecting rod is threadedly connected with an anti-detachment bolt, and an identification ring is fixedly installed on the bottom of the movable ring.

[0015] Compared with the prior art, the present invention has the following beneficial effects: by rotating the rotary cover in reverse, the threaded rod moves downward inside the threaded ring, thereby driving the piston head to move downward inside the dripping cylinder, thereby squeezing the liquid inside the dripping cylinder, and thus discharging and dripping the liquid to be dripped through the dripping tube; the applied force can be adjusted by rotating, and by controlling the strength and speed of the rotation, the pressure during the dripping process can be ensured to be stable, thereby ensuring the accuracy of dripping; The cam is pressed against the bottom of the cam, and the cam is pressed against the top of the cam, so that the cam is pressed against the top of the cam, and the cam is pressed against the cam, so that the cam is pressed against the cam, and the cam is pressed against the cam. In addition, when the connecting rod moves up and down, it can drive the anti-drop bolt to move up and down, thereby driving the moving ring to move up and down on the outside of the drip cylinder through the rotating ring 2, thereby driving the identification ring to move up and down on the outside of the drip cylinder, ensuring that the slight displacement of the connecting rod can be accurately reflected in the position change of the identification ring. In conjunction with the scale lines on the outside of the drip cylinder, the staff does not need to directly observe the liquid itself, but only needs to pay attention to the corresponding relationship between the identification ring and the scale lines to accurately determine the amount of liquid to be added. This is suitable for liquids that cannot be exposed to light. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional appearance structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure from another perspective of the present invention.

[0018] Figure 3 It is a schematic diagram of the internal structure of the dropping cylinder of the present invention.

[0019] Figure 4 It is a schematic diagram of the partial bottom view of the piston assembly of the present invention.

[0020] Figure 5 This is a partial top view structural schematic diagram of the piston assembly of the present invention.

[0021] Figure 6 This is a top view three-dimensional structural schematic diagram of the rotating cover of the present invention.

[0022] Figure 7 This is a bottom view three-dimensional structural schematic diagram of the rotating cover of the present invention.

[0023] Figure 8 This is a partial three-dimensional structural schematic diagram of the drive assembly of the present invention.

[0024] In the figure: 1. dropping cylinder; 2. rotating cover; 3. connecting rod; 4. air delivery pipe; 5. rotating shaft; 6. pressing rod; 7. inserting rod; 8. first inserting sleeve; 9. second inserting sleeve; 10. first rotating ring; 11. third inserting sleeve; 12. anti-detachment bolt; 13. identification ring; 14. dropping tube; 15. moving ring; 16. second rotating ring; 17. fixing ring; 18. placing seat; 19. pressing ring; 20. lower pressing plate; 21. first communicating pipe; 22. air inlet pipe; 23. second communicating pipe; 24. threaded rod; 25. threaded ring; 26. support rod; 27. sliding block; 28. sliding groove; 29. hexagonal clamping groove; 30. piston head; 31. air outlet groove; 32. cushion block; 33. circular through groove; 34. limiting pressing strip; 35. third rotating ring; 36. plastic airbag; 37. hexagonal clamping post; 38. ventilation groove. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0026] Please refer to Figures 1 - 8, the present invention provides a technical solution: a device for quantitatively dripping a liquid reagent for a titration experiment, including a dripping cylinder 1. A dropping tube 14 is fixedly installed at the bottom of the dripping cylinder 1. A piston assembly is installed inside the dripping cylinder 1. The piston assembly includes a piston head 30 and a threaded ring 25. A threaded rod 24 is fixedly installed at the top of the piston head 30. A rotating shaft 5 is fixedly installed at the top of the threaded rod 24. The outer wall of the piston head 30 is in sealed sliding connection with the inner wall of the dripping cylinder 1. Two support rods 26 are fixedly installed on the outer side of the threaded ring 25. One end of each of the two support rods 26 away from the threaded ring 25 is fixedly installed with a sliding block 27. The threaded rod 24 is threadedly connected to the inner side of the threaded ring 25. Sliding grooves 28 are respectively opened on both sides of the inner cavity of the dripping cylinder 1. The sliding blocks 27 are respectively slidably installed inside the two sliding grooves 28. A rotating cover 2 is installed at the top of the dripping cylinder 1. A driving assembly is installed on the outer sides of the dripping cylinder 1 and the rotating cover 2. The driving assembly includes a connecting rod 3 and a fixing ring 17. The connecting rod 3 is clamped and installed at the top of the rotating shaft 5. A plugging rod 7 is fixedly installed at the bottom of one end of the connecting rod 3. The fixing ring 17 is fixedly installed on the outer side of the dripping cylinder 1. A first rotating ring 10 is rotatably installed on the outer side of the fixing ring 17. A second plugging sleeve 9 is fixedly installed on the outer side of the first rotating ring 10. The plugging rod 7 is slidably inserted into the second plugging sleeve 9. A first plugging sleeve 8 is fixedly installed on the outer side of the rotating cover 2. And the plugging rod 7 is slidably inserted into the first plugging sleeve 8. A circular through groove 33 is opened inside the rotating cover 2. The rotating shaft 5 is slidably installed inside the circular through groove 33. A third rotating ring 35 is rotatably installed at the bottom of the rotating cover 2. Two limiting pressing strips 34 are symmetrically fixedly installed at the bottom of the third rotating ring 35. The positions of the two limiting pressing strips 34 respectively correspond to the positions of the two sliding grooves 28. A hexagonal clamping groove 29 is opened at the top of the rotating shaft 5. A hexagonal clamping column 37 is fixedly installed at the bottom of the connecting rod 3. The size and specification of the outer contour of the hexagonal clamping column 37 are adapted to the size and specification of the inner contour of the hexagonal clamping groove 29. And the position of the hexagonal clamping column 37 corresponds to the position of the hexagonal clamping groove 29. An air filling assembly is installed at the top of the rotating cover 2. A marking assembly is installed on the outer side of the dripping cylinder 1.

[0027] Working principle of the above technical solution: First, assemble the device. The driving component can drive the piston component to move inside the dropping cylinder 1, so that the liquid to be dropped can be adsorbed into the dropping cylinder 1 or pushed out from the inside of the dropping cylinder 1 through the dropper 14. The device that realizes the precise inhalation and dropping of liquid by driving the piston component to move inside the dropping cylinder has the advantages of simple operation and high dropping accuracy. First, thread the threaded ring 25 onto the outside of the threaded rod 24, then place the piston head 30 inside the dropping cylinder 1, then slide the sliding blocks 27 at the ends of the support rods 26 on both sides of the threaded ring 25 into the inside of the sliding groove 28, and then install the rotating cover 2 on the top of the dropping cylinder 1, so that the circular through groove 33 is sleeved on the outside of the rotating shaft 5, and make the socket sleeve one 8 and the socket sleeve two 9 on the same vertical line. Then, snap the hexagonal clamping post 37 at the bottom of the connecting rod 3 into the hexagonal clamping groove 29 at the top of the rotating shaft 5, and insert the insertion rod 7 into the socket sleeve one 8 and the socket sleeve two 9. At this time, just rotate the rotating cover 2 forward, so as to drive the insertion rod 7 to rotate through the socket sleeve one 8, and then drive the connecting rod 3 to rotate through the insertion rod 7, and then drive the rotating shaft 5 to rotate through the hexagonal clamping post 37 and the hexagonal clamping groove 29, so as to drive the threaded rod 24 to rotate, so that the threaded rod 24 moves upward inside the threaded ring 25, so as to drive the piston head 30 to move upward inside the dropping cylinder 1, so as to suck the liquid to be dropped through the dropper 14. By rotating, the position of the piston head 30 inside the dropping cylinder 1 can be adjusted more precisely, so as to ensure the amount of liquid inhaled and guarantee the accuracy of subsequent liquid dropping. When the liquid needs to be dropped, just rotate the rotating cover 2 in reverse, so that the threaded rod 24 moves downward inside the threaded ring 25, so as to drive the piston head 30 to move downward inside the dropping cylinder 1, so as to squeeze the liquid inside the dropping cylinder 1, so as to discharge and drop the liquid to be dropped through the dropper 14. By adopting the rotating method, the applied force can be adjusted. By controlling the strength and speed of rotation, the pressure stability during the dropping process can be ensured, so as to guarantee the dropping accuracy.

[0028] In another embodiment, as Figures 1 - 8As shown, the gas adding component includes a placement seat 18, inside which a plastic airbag 36 is installed. A pressing ring 19 is slidably installed inside the placement seat 18. One side of the plastic airbag 36 is communicated with an air inlet pipe 22, and a check valve one is installed inside the air inlet pipe 22. One side of the plastic airbag 36 is communicated with a connecting pipe two 23, and the end of the connecting pipe two 23 away from the plastic airbag 36 is communicated with an air delivery pipe 4. A connecting pipe one 21 is installed at the top of the connecting rod 3. An air vent groove 38 is opened inside the hexagonal clamping post 37, and the air vent groove 38 is communicated with the connecting pipe one 21. An air outlet groove 31 is opened inside the rotating shaft 5, the threaded rod 24 and the piston head 30. A check valve two is installed inside the air outlet groove 31 opened inside the piston head 30. A cushion block 32 is fixedly installed at the bottom of the piston head 30.

[0029] After installing the connecting rod 3 on the top of the rotating shaft 5, when the piston head 30 moves downward inside the dropping cylinder 1 to drop the liquid, the plug in the connecting pipe one 21 can be taken out, and then the end of the air delivery pipe 4 away from the connecting pipe two 23 is inserted into the connecting pipe one 21. When the piston head 30 moves downward inside the dropping cylinder 1, the connecting rod 3 can be driven to move downward by the rotating shaft 5, so as to drive the lower pressing plate 20 to move downward through the lower pressing rod 6, thereby pushing the pressing ring 19 to move downward inside the placement seat 18, so as to squeeze the plastic airbag 36, so that the gas inside the plastic airbag 36 is discharged into the air delivery pipe 4 through the connecting pipe two 23, and then discharged into the air outlet groove 31 through the connecting pipe one 21 and the air vent groove 38, and then discharged into the dropping cylinder 1 through the air outlet groove 31. The remaining liquid inside the dropping cylinder 1 is squeezed by the gas, so that the liquid is discharged through the dropping pipe 14 for dropping, preventing the liquid from remaining inside the dropping cylinder 1, which can greatly improve the accuracy and reliability of liquid dropping, and ensure the accuracy of experimental results and the consistency of product quality.

[0030] In another embodiment, as Figures 1 - 8 shown, pressing rods 6 are fixedly installed on both sides of the bottom of the connecting rod 3, and lower pressing plates 20 are fixedly installed at the ends of the pressing rods 6 away from the connecting rod 3, and the lower pressing plates 20 are located directly above the pressing ring 19. The marking component includes a moving ring 15 and scale lines arranged on the outside of the dropping cylinder 1. A rotating ring two 16 is rotatably installed on the outside of the moving ring 15. A plugging sleeve three 11 is fixedly installed on the outside of the rotating ring two 16. The end of the plugging rod 7 away from the connecting rod 3 is inserted and installed inside the plugging sleeve three 11. A retaining bolt 12 is threadedly connected to the end of the plugging rod 7 away from the connecting rod 3. A marking ring 13 is fixedly installed at the bottom of the moving ring 15.

[0031] When the connecting rod 7 moves up and down, it can drive the anti-drop bolt 12 to move up and down, thereby driving the movable ring 15 to move up and down on the outside of the drip cylinder 1 through the rotating ring 2 16, thereby driving the identification ring 13 to move up and down on the outside of the drip cylinder 1, ensuring that the slight displacement of the connecting rod 7 can be accurately reflected in the position change of the identification ring. In conjunction with the scale lines on the outside of the drip cylinder 1, the staff does not need to directly observe the liquid itself, but only needs to pay attention to the correspondence between the identification ring and the scale lines to accurately determine the amount of liquid to be added. This is suitable for liquids that cannot be illuminated.

[0032] Working principle: First, assemble the device. The driving component can drive the piston component to move inside the dropping cylinder 1, so that the liquid to be dropped can be adsorbed into the dropping cylinder 1 through the dropper 14 or pushed out from the inside of the dropping cylinder 1. The device that drives the piston component to move inside the dropping cylinder through the driving component to achieve precise suction and dropping of the liquid has the advantages of simple operation and high dropping accuracy. First, thread the threaded ring 25 onto the outside of the threaded rod 24, then place the piston head 30 inside the dropping cylinder 1, then slide the sliding blocks 27 at the ends of the support rods 26 on both sides of the threaded ring 25 into the inside of the sliding groove 28, and then install the rotating cover 2 on the top of the dropping cylinder 1, so that the circular through groove 33 is sleeved on the outside of the rotating shaft 5, and make the plug-in sleeve one 8 and the plug-in sleeve two 9 on the same vertical line. Then, snap the hexagonal clamping post 37 at the bottom of the connecting rod 3 into the hexagonal clamping groove 29 at the top of the rotating shaft 5, and insert the plug-in rod 7 into the inside of the plug-in sleeve one 8 and the plug-in sleeve two 9. At this time, just rotate the rotating cover 2 forward, so that the plug-in rod 7 is driven to rotate through the plug-in sleeve one 8, so that the connecting rod 3 is driven to rotate through the plug-in rod 7, so that the rotating shaft 5 is driven to rotate through the hexagonal clamping post 37 and the hexagonal clamping groove 29, so that the threaded rod 24 rotates, so that the threaded rod 24 moves upward inside the threaded ring 25, so that the piston head 30 moves upward inside the dropping cylinder 1, so that the liquid to be dropped is sucked through the dropper 14. By rotating, the position of the piston head 30 inside the dropping cylinder 1 can be adjusted more precisely, so as to ensure the amount of liquid sucked and guarantee the accuracy of subsequent liquid dropping. When the liquid needs to be dropped, just rotate the rotating cover 2 in reverse, so that the threaded rod 24 moves downward inside the threaded ring 25, so that the piston head 30 moves downward inside the dropping cylinder 1, so as to squeeze the liquid inside the dropping cylinder 1, so that the liquid to be dropped is discharged and dropped through the dropper 14. By rotating, the applied force can be adjusted. By controlling the force and speed of rotation, the pressure during the dropping process can be ensured to be stable, so as to guarantee the dropping accuracy. After installing the connecting rod 3 on the top of the rotating shaft 5, when the piston head 30 moves downward inside the dropping cylinder 1 to drop the liquid, the plugging block inside the connecting pipe one 21 can be taken out, and then the end of the air delivery pipe 4 far away from the connecting pipe two 23 is inserted into the inside of the connecting pipe one 21. When the piston head 30 moves downward inside the dropping cylinder 1, the rotating shaft 5 can drive the connecting rod 3 to move downward, so that the lower pressing rod 6 drives the lower pressing plate 20 to move downward, so as to push the lower pressing ring 19 to move downward inside the placing seat 18, so as to squeeze the plastic airbag 36, so that the gas inside the plastic airbag 36 is discharged into the inside of the air delivery pipe 4 through the connecting pipe two 23, and then enters the air outlet groove 31 through the connecting pipe one 21 and the ventilation groove 38, and then enters the inside of the dropping cylinder 1 through the air outlet groove 31.The gas squeezes the liquid remaining inside the dripping tube 1, causing it to be discharged and dripped through the dripping tube 14, preventing liquid from remaining inside the dripping tube 1. This can greatly improve the accuracy and reliability of liquid dripping, ensuring the accuracy of experimental results and the consistency of product quality. When the plug rod 7 moves up and down, it can drive the anti-slip bolt 12 to move up and down, thereby driving the movable ring 15 to move up and down on the outside of the dripping tube 1 through the rotating ring 2 16, thereby driving the identification ring 13 to move up and down on the outside of the dripping tube 1, ensuring that the slight displacement of the plug rod 7 can be accurately reflected in the position change of the identification ring. In conjunction with the scale lines on the outside of the dripping tube 1, the staff does not need to directly observe the liquid itself, but only needs to pay attention to the corresponding relationship between the identification ring and the scale lines to accurately determine the amount of liquid to be dripped. This is suitable for liquids that cannot be illuminated.

[0033] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A liquid reagent quantitative dropping device for titration experiments, comprising a dropping cylinder (1), characterized in that: A dropping tube (14) is fixedly installed at the bottom of the dropping cylinder (1). A piston assembly is installed inside the dropping cylinder (1). A rotating cover (2) is installed at the top of the dropping cylinder (1). A driving assembly is installed on the outer sides of the dropping cylinder (1) and the rotating cover (2). An air filling assembly is installed at the top of the rotating cover (2). A marking assembly is installed on the outer side of the dropping cylinder (1).

2. The quantitative dropping device for liquid reagents used in titration experiments according to claim 1, wherein: The piston assembly includes a piston head (30) and a threaded ring (25). A threaded rod (24) is fixedly installed at the top of the piston head (30). A rotating shaft (5) is fixedly installed at the top of the threaded rod (24). The outer wall of the piston head (30) is in sealed sliding connection with the inner wall of the dropping cylinder (1). Two support rods (26) are fixedly installed on the outer side of the threaded ring (25). Sliding blocks (27) are fixedly installed at the ends of the two support rods (26) away from the threaded ring (25). The threaded rod (24) is threadedly connected to the inner side of the threaded ring (25).

3. The quantitative dropping device for liquid reagents used in titration experiments according to claim 2, wherein: Sliding grooves (28) are formed on both sides of the inner cavity of the dropping cylinder (1). The sliding blocks (27) are respectively slidably installed inside the two sliding blocks (27).

4. A liquid reagent quantitative dropping device for titration experiments according to claim 3, characterized in that: The driving assembly includes a connecting rod (3) and a fixed ring (17). The connecting rod (3) is clamped and installed at the top of the rotating shaft (5). A plugging rod (7) is fixedly installed at the bottom of one end of the connecting rod (3). The fixed ring (17) is fixedly installed on the outer side of the dropping cylinder (1). A first rotating ring (10) is rotatably installed on the outer side of the fixed ring (17). A second plugging sleeve (9) is fixedly installed on the outer side of the first rotating ring (10). The plugging rod (7) is slidably plugged inside the second plugging sleeve (9).

5. A liquid reagent quantitative dropping device for titration experiments according to claim 4, characterized in that: A first plugging sleeve (8) is fixedly installed on the outer side of the rotating cover (2). The plugging rod (7) is slidably plugged inside the first plugging sleeve (8). A circular through groove (33) is formed inside the rotating cover (2). The rotating shaft (5) is slidably installed inside the circular through groove (33). A third rotating ring (35) is rotatably installed at the bottom of the rotating cover (2). Two limiting pressing strips (34) are symmetrically fixedly installed at the bottom of the third rotating ring (35). The positions of the two limiting pressing strips (34) correspond to the positions of the two sliding grooves (28) respectively.

6. The quantitative dropping device for liquid reagents used in titration experiments according to claim 5, characterized in that: A hexagonal clamping groove (29) is formed at the top of the rotating shaft (5). A hexagonal clamping column (37) is fixedly installed at the bottom of the connecting rod (3). The specification size of the outer contour of the hexagonal clamping column (37) is adapted to the specification size of the inner contour of the hexagonal clamping groove (29). And the position of the hexagonal clamping column (37) corresponds to the position of the hexagonal clamping groove (29).

7. A liquid reagent quantitative dropping device for titration experiments according to claim 6, characterized in that: The air charging component includes a placement seat (18), a plastic airbag (36) is installed inside the placement seat (18), a pressing ring (19) is slidably installed inside the placement seat (18), one side of the plastic airbag (36) is communicated with an air inlet pipe (22), and a check valve one is installed inside the air inlet pipe (22). One side of the plastic airbag (36) is communicated with a connecting pipe two (23), and one end of the connecting pipe two (23) far from the plastic airbag (36) is communicated with an air delivery pipe (4).

8. A liquid reagent quantitative dropping device for titration experiments according to claim 7, characterized in that: A connecting pipe one (21) is installed at the top of the connecting rod (3). An air vent groove (38) is opened inside the hexagonal clamping column (37), and the air vent groove (38) is communicated with the connecting pipe one (21). An air outlet groove (31) is opened inside the rotating shaft (5), the threaded rod (24) and the piston head (30). A check valve two is installed inside the air outlet groove (31) opened inside the piston head (30). A cushion block (32) is fixedly installed at the bottom of the piston head (30).

9. A liquid reagent quantitative dropping device for titration experiments according to claim 8, characterized in that: Lower pressing rods (6) are fixedly installed on both sides of the bottom of the connecting rod (3), and lower pressing plates (20) are fixedly installed at the ends of the lower pressing rods (6) far from the connecting rod (3), and the lower pressing plates (20) are located directly above the pressing ring (19).

10. A liquid reagent quantitative dropping device for titration experiments according to claim 9, characterized in that: The marking component includes a moving ring (15) and scale lines arranged on the outer side of the dropping cylinder (1). A rotating ring two (16) is rotatably installed on the outer side of the moving ring (15). A plugging sleeve three (11) is fixedly installed on the outer side of the rotating ring two (16). One end of the plugging rod (7) far from the connecting rod (3) is plugged and installed inside the inner side of the plugging sleeve three (11). An anti-loosening bolt (12) is threadedly connected to one end of the plugging rod (7) far from the connecting rod (3). A marking ring (13) is fixedly installed at the bottom of the moving ring (15).

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