Titration device

Abstract

The invention relates to the field of chemical experiments, in particular to a titration device which comprises a liquid storage cylinder, a conical hopper with a wide top and a narrow bottom is mounted at the lower end of the liquid storage cylinder, a detachable cylinder cover is mounted at the upper end of the liquid storage cylinder, a vertical hole is formed in the middle of the upper surface of the cylinder cover, and a pull rod is inserted in the vertical hole. The lower end of the pull rod extends into the liquid storage cylinder and is provided with a first piston, a lower stop valve is installed on the upper surface of the cylinder cover, a transverse cylinder is installed at the upper end of the lower stop valve, a second piston is slidably installed in the transverse cylinder, and a spring is arranged on the side, away from the connecting position of the lower stop valve and the transverse cylinder, of the second piston. The spring is arranged in the length direction of the transverse barrel, a detachable end cover is installed at the open end of the transverse barrel, and a control piece used for controlling the liquid dropping amount is installed on the upper portion of the closed end of the transverse barrel. The condition that the reagent is dripped too much or insufficient is prevented.

Description

Technical Field

[0001] The invention relates to a titration device, belonging to the field of chemical experiments. Background Art

[0002] Titration is a chemical analysis method used to determine the concentration of a component in a solution. Specifically, titration is done by gradually adding a solution of known concentration (called a standard solution) to another solution containing the substance to be tested until the two react completely. The endpoint of this reaction is usually determined by observing the change in the color of the indicator. Once the endpoint is reached, the content of the substance to be tested can be calculated based on the volume and concentration of the standard solution used. The burette is one of the commonly used titration devices. The burette is mainly composed of parts such as a bracket, a tube clamp and a tube body. During use, the staff first clamps the tube body containing the reagent on the tube clamp, and then the staff will place the conical flask under the burette, and then open the valve at the lower end of the burette. The reagent in the burette drips into the conical flask under its own weight to complete the titration of the inside of the conical flask. In this way, the reagent drips by its own weight, and the amount of dripping cannot be accurately controlled in advance, which is prone to excessive or insufficient titration of the reagent. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention aims to provide a titration device to solve the problems raised in the above background technology.

[0004] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical scheme: a titration device, including a liquid storage cylinder, a tapered bucket with a wide top and a narrow bottom is installed at the lower end of the liquid storage cylinder, a pipe joint is installed at the lower end of the tapered bucket, a titration head is sleeved on the pipe joint, a detachable cylinder cover is installed at the upper end of the liquid storage cylinder, a vertical hole is opened in the middle of the upper surface of the cylinder cover, a pull rod is inserted in the vertical hole, the lower end of the pull rod extends into the liquid storage cylinder and is installed with a first piston, the first piston is slidably installed in the liquid storage cylinder, and the upper side of the vertical hole is provided with a cylinder cover. A sealing member connected to each other, a lower stop valve is installed on the upper surface of the cylinder cover, a horizontal cylinder is installed on the upper end of the lower stop valve, the upper end of the lower stop valve is connected to the closed end of the horizontal cylinder, a second piston is slidably installed in the horizontal cylinder, a spring is provided on the side of the second piston away from the connection part between the lower stop valve and the horizontal cylinder, the spring is arranged along the length direction of the horizontal cylinder, a detachable end cover is installed on the open end of the horizontal cylinder, one end of the spring away from the second piston is in contact with the end cover, and a control member for controlling the amount of liquid droplets is installed at the upper position of the closed end of the horizontal cylinder.

[0005] Specifically, the control component includes an upper stop valve, an upper stop valve communicating with the horizontal cylinder is installed at the upper position of the closed end of the horizontal cylinder, a bent pipe is installed at the upper end of the upper stop valve, a transparent cylinder is installed at the end of the bent pipe away from the upper stop valve, the transparent cylinder is arranged on the upper side of the horizontal cylinder and the transparent cylinder is arranged parallel to the horizontal cylinder, the outer surface of the transparent cylinder is processed with scale lines arranged along the length direction of the transparent cylinder, a detachable blind plate is installed at the end of the transparent cylinder away from the bent pipe, a screw is threadedly connected at the middle position of one side of the blind plate, a third piston is installed at the end of the screw located in the transparent cylinder, the third piston is slidably installed in the transparent cylinder, a handle is installed at the end of the screw away from the third piston, and a vent valve is installed at the upper position of one end of the transparent cylinder close to the bent pipe.

[0006] Specifically, a vertical plate is provided on one side of the horizontal cylinder, and an upper positioning ring is connected and fixed to the upper end of the vertical plate, and the upper positioning ring is sleeved on the transparent cylinder and fixed to the transparent cylinder, and a lower positioning ring is sleeved on the horizontal cylinder and fixed to the horizontal cylinder, and the lower positioning ring is connected and fixed to the vertical plate, and a carrier plate is connected and fixed to the lower end of the vertical plate, and the carrier plate is sleeved on the liquid storage cylinder and fixed to the liquid storage cylinder, and two fixing holes are provided on the upper surface of the carrier plate, and an inclined plate is connected and fixed to the lower end of the vertical plate, and the end of the inclined plate away from the vertical plate is connected and fixed to the carrier plate.

[0007] Specifically, two symmetrically arranged limit heads are installed on a side of the third piston away from the screw, and the limit heads are arranged along the length direction of the screw. The horizontal length of the connection between the vent valve and the transparent tube and the elbow is less than the length of the limit heads.

[0008] Specifically, an upper connecting ring connected and fixed to the transparent tube is sleeved on one end of the transparent tube away from the bent pipe, and the blind plate is connected to the upper connecting ring by multiple bolts. A transverse hole is opened in the middle of one side of the blind plate, and a threaded sleeve concentrically arranged with the transverse hole is provided on the outside of the transverse hole. One end of the threaded sleeve is connected and fixed to the blind plate, and the screw is threadedly connected in the threaded sleeve, and the screw passes through the transverse hole.

[0009] Specifically, the end of the horizontal cylinder away from the lower stop valve is provided with a lower connecting ring connected and fixed to the horizontal cylinder, the end cover is connected and fixed to the lower connecting ring by multiple bolts, a pipe sleeve is installed in the middle position of the side of the end cover facing the horizontal cylinder, the pipe sleeve is inserted in the horizontal cylinder, and the end of the spring away from the second piston is inserted in the pipe sleeve.

[0010] Specifically, a blocking rod is installed on the side of the second piston facing away from the spring, and the blocking rod is arranged along the length direction of the horizontal cylinder. The horizontal length of the connection part between the lower stop valve and the horizontal cylinder and the closed end of the horizontal cylinder is less than the length of the blocking rod, and the horizontal length of the connection part between the upper stop valve and the horizontal cylinder and the closed end of the horizontal cylinder is less than the length of the blocking rod.

[0011] Specifically, the sealing member includes a support sleeve, a support sleeve concentrically arranged with the vertical hole is provided on the upper side of the vertical hole, the lower end of the support sleeve is connected and fixed to the cylinder cover, a sealing sleeve is pasted on the inner surface of the support sleeve, the sealing sleeve is wrapped around the pull rod, and an end cap is connected and fixed to the upper end of the pull rod.

[0012] Specifically, a conical head extending into the conical bucket is connected and fixed to the lower surface of the first piston, and the conical head and the first piston are an integrally formed structure.

[0013] Specifically, an end ring is connected and fixed to the upper end of the liquid storage cylinder, a sealing ring is provided between the end ring and the cylinder cover, and the end ring, the cylinder cover and the sealing ring are connected to each other by a plurality of bolts.

[0014] Beneficial effects of the present invention:

[0015] 1. First, open the vent valve, and then use the screw to drive the third piston to move towards the blind plate. At this time, the external air enters the transparent cylinder through the vent valve, and then close the vent valve, open the upper stop valve and keep the lower stop valve in a closed state, and then turn the screw to move the third piston away from the blind plate. At this time, the third piston squeezes the air in the transparent cylinder into the horizontal cylinder, and then the second piston squeezes the spring to make the spring produce elastic deformation, and the third piston moves to the desired position through the scale line on the transparent cylinder, so that a certain amount of air enters the horizontal cylinder, close the upper stop valve and open the The lower stop valve, at this time, under the action of the spring rebound force, causes the second piston to squeeze the air into the horizontal cylinder, and the air in the horizontal cylinder enters the space formed by the liquid storage cylinder and the cylinder cover, so that the air pressure on the upper side of the first piston increases, and the first piston moves downward under the action of the increased air pressure, so that the reagent in the liquid storage cylinder is squeezed out. Since the amount of air entering the liquid storage cylinder is constant, the amount of downward movement of the first piston is constant, and the amount of reagent dripping under the squeezing of the first piston is constant, so that the downward movement amount of the first piston can be pre-set according to needs to prevent excessive or insufficient dripping of reagent.

[0016] 2. A blocking rod is installed on the side of the second piston away from the spring. Under the action of the blocking rod, the second piston does not move to the connection between the upper stop valve and the horizontal cylinder and the connection between the lower stop valve and the horizontal cylinder, which is conducive to the air entering and exiting the horizontal cylinder through the upper stop valve and the lower stop valve.

[0017] 3. Install two limit heads on the third piston. Under the restriction of the limit heads, the third piston will not move to the connection position between the vent valve and the transparent tube.

[0018] 4. Use the vertical plate to connect the upper positioning ring and the lower positioning ring, so that the upper positioning ring and the lower positioning ring are respectively mounted on the transparent tube and the horizontal tube, and then the carrier plate is mounted on the liquid storage tube. At this time, the carrier plate, vertical plate and other components jointly support the horizontal tube and the transparent tube to improve the stability of the overall structure.

[0019] 5. Make the pull rod pass through the sealing sleeve in the support sleeve, so that under the action of the sealing sleeve, the air is prevented from leaking through the contact part between the pull rod and the cylinder cover without affecting the up and down movement of the pull rod.

[0020] 6. Install an internal thread sleeve on one side of the blind plate, so that the screw is threadedly connected in the internal thread sleeve and the screw passes through the transverse hole, thereby partially increasing the thickness of the blind plate installation screw portion and completing a stable threaded connection between the screw and the blind plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0022] Figure 1 It is a structural schematic diagram of a titration device of the present invention;

[0023] Figure 2 A stereoscopic view of a titration device according to the present invention from another perspective;

[0024] Figure 3 It is a schematic diagram of the assembly of a first piston, a cylinder cover, a pull rod and a liquid storage cylinder in a titration device of the present invention;

[0025] Figure 4 It is a schematic diagram of the assembly of a first piston and a pull rod in a titration device of the present invention;

[0026] Figure 5 It is a cross-sectional assembly diagram of an end cover, a spring, a second piston and a horizontal cylinder in a titration device of the present invention;

[0027] Figure 6 It is a schematic diagram of the assembly of a second piston, a spring, a tube sleeve and an end cover in a titration device of the present invention;

[0028] Figure 7 It is a cross-sectional assembly schematic diagram of a third piston, a screw rod, a blind plate and a transparent cylinder in a titration device of the present invention;

[0029] Figure 8 It is a schematic diagram of the assembly of a third piston, a screw rod and a blind plate in a titration device of the present invention;

[0030] In the figure: 1, liquid storage cylinder, 2, end ring, 3, sealing ring, 4, cylinder cover, 5, pull rod, 6, end, 7, elbow, 8, vent valve, 9, transparent cylinder, 10, upper positioning ring, 11, blind plate, 12, screw, 13, handle, 14, vertical plate, 15, lower positioning ring, 16, horizontal cylinder, 17, upper stop valve, 18, lower stop valve, 19, inclined plate, 20, carrier plate, 21, fixing hole, 22, support sleeve, 23, tapered bucket, 24, pipe joint, 25, titration head, 26, end cover, 27, threaded sleeve, 28, first piston, 29, tapered head, 30, blocking rod, 31, second piston, 32, spring, 33, pipe sleeve, 34, lower connecting ring, 35, limit head, 36, third piston, 37, upper connecting ring. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0032] See also Figure 1-Figure 4 The present invention provides a technical solution: a titration device, comprising a liquid storage cylinder 1, a tapered bucket 23 with a wide top and a narrow bottom is installed at the lower end of the liquid storage cylinder 1, a pipe joint 24 is installed at the lower end of the tapered bucket 23, a titration head 25 is sleeved on the pipe joint 24, a detachable cylinder cover 4 is installed at the upper end of the liquid storage cylinder 1, wherein an end ring 2 is connected and fixed to the upper end of the liquid storage cylinder 1, a sealing ring 3 is arranged between the end ring 2 and the cylinder cover 4, the end ring 2, the cylinder cover 4 and the sealing ring 3 are connected to each other by a plurality of bolts, a vertical hole is opened in the middle of the upper surface of the cylinder cover 4, a pull rod 5 is inserted in the vertical hole, the lower end of the pull rod 5 extends into the liquid storage cylinder 1 and is installed with a first piston 28, and the first piston 28 is slidably installed in the liquid storage cylinder 1 A conical head 29 extending into the conical bucket 23 is connected and fixed to the lower surface of the first piston 28. The conical head 29 and the first piston 28 are an integrally formed structure. The design of the conical head 29 is convenient for squeezing out the reagent in the conical bucket 23. A support sleeve 22 arranged concentrically with the vertical hole is provided on the upper side of the vertical hole. The lower end of the support sleeve 22 is connected and fixed to the cylinder cover 4. A sealing sleeve is pasted on the inner surface of the support sleeve 22. The sealing sleeve is wrapped on the pull rod 5. The upper end of the pull rod 5 is connected and fixed with an end head 6, so that the pull rod 5 passes through the sealing sleeve in the support sleeve 22. Therefore, under the action of the sealing sleeve, without affecting the up and down movement of the pull rod 5, air leakage through the contact portion between the pull rod 5 and the cylinder cover 4 is prevented.

[0033] See also Figure 1 , Figure 2 , Figure 5 and Figure 6The upper surface of the cylinder cover 4 is provided with a lower stop valve 18, and the upper end of the lower stop valve 18 is provided with a horizontal cylinder 16, and the upper end of the lower stop valve 18 is connected and communicated with the closed end of the horizontal cylinder 16. A second piston 31 is slidably installed in the horizontal cylinder 16, and a spring 32 is provided on the side of the second piston 31 away from the connection between the lower stop valve 18 and the horizontal cylinder 16. The spring 32 is arranged along the length direction of the horizontal cylinder 16, and a detachable end cover 26 is installed at the open end of the horizontal cylinder 16, wherein the end of the horizontal cylinder 16 away from the lower stop valve 18 is provided with a sleeve connected and fixed to the horizontal cylinder 16 The lower connecting ring 34 and the end cover 26 are connected and fixed to the lower connecting ring 34 by multiple bolts. A sleeve 33 is installed in the middle of the side of the end cover 26 facing the transverse cylinder 16. The sleeve 33 is inserted in the transverse cylinder 16. The end of the spring 32 away from the second piston 31 is inserted in the sleeve 33. The sleeve 33 limits the position of one end of the spring 32. At the same time, after the spring 32 is compressed into the sleeve 33, when the sleeve 33 contacts the second piston 31, the second piston 31 no longer moves, thereby preventing the spring 32 from being damaged by excessive squeezing.

[0034] See also Figure 1 , Figure 2 , Figure 7 and Figure 8 An upper stop valve 17 communicating with the horizontal cylinder 16 is installed at the upper position of the closed end of the horizontal cylinder 16, a bend pipe 7 is installed at the upper end of the upper stop valve 17, and a transparent cylinder 9 is installed at the end of the bend pipe 7 away from the upper stop valve 17. The transparent cylinder 9 is arranged on the upper side of the horizontal cylinder 16 and the transparent cylinder 9 is arranged parallel to the horizontal cylinder 16. The outer surface of the transparent cylinder 9 is processed with scale lines arranged along the length direction of the transparent cylinder 9. A detachable blind plate 11 is installed at the end of the transparent cylinder 9 away from the bend pipe 7, wherein the end of the transparent cylinder 9 away from the bend pipe 7 is sleeved with an upper connecting ring 37 connected and fixed to the transparent cylinder 9, and the blind plate 11 is connected to the upper connecting ring by a plurality of bolts. The blind plate 11 is connected with a connecting ring 37, and a screw rod 12 is threadedly connected at the middle position of one side of the blind plate 11, wherein a transverse hole is opened at the middle position of one side of the blind plate 11, and a threaded sleeve 27 arranged concentrically with the transverse hole is provided on the outside of the transverse hole, and one end of the threaded sleeve 27 is connected and fixed to the blind plate 11, and the screw rod 12 is threadedly connected in the threaded sleeve 27, and the screw rod 12 passes through the transverse hole. An internal threaded sleeve 27 is installed on one side of the blind plate 11, so that the screw rod 12 is threadedly connected in the internal threaded sleeve 27 and the screw rod 12 passes through the transverse hole, so as to locally increase the thickness of the blind plate 11 where the screw rod 12 is installed, and complete the stable threaded connection between the screw rod 12 and the blind plate 11.

[0035] See also Figure 1-Figure 8, a third piston 36 is installed at one end of the screw 12 in the transparent cylinder 9, and the third piston 36 is slidably installed in the transparent cylinder 9, a handle 13 is installed at the end of the screw 12 away from the third piston 36, and a vent valve 8 is installed at the upper position of the end of the transparent cylinder 9 close to the elbow 7. First, the vent valve 8 is opened, and then the screw 12 is used to drive the third piston 36 to move toward the blind plate 11. At this time, external air enters the transparent cylinder 9 through the vent valve 8, and then the vent valve 8 is closed, the upper stop valve 17 is opened and the lower stop valve 18 is in a closed state, and then the screw 12 is twisted to make the third piston 36 move away from the blind plate 11. At this time, the third piston 36 squeezes the air in the transparent cylinder 9 into the horizontal cylinder 16, and then the second piston 31 squeezes the spring 32 to make the spring 32 produce elastic deformation, and the air passes through the transparent cylinder The scale line on 9 moves the third piston 36 to the desired position, allowing a certain amount of air to enter the horizontal cylinder 16, closing the upper stop valve 17 and opening the lower stop valve 18. At this time, under the action of the rebound force of the spring 32, the second piston 31 squeezes the air entering the horizontal cylinder 16, allowing the air in the horizontal cylinder 16 to enter the space formed by the liquid storage cylinder 1 and the cylinder cover 4, thereby increasing the air pressure on the upper side of the first piston 28. Under the action of the increased air pressure, the first piston 28 moves downward, thereby squeezing out the reagent in the liquid storage cylinder 1. Since the amount of air entering the liquid storage cylinder 1 is constant, the amount of downward movement of the first piston 28 is constant, and the amount of reagent dripping under the squeezing of the first piston 28 is constant, so that the downward movement of the first piston 28 can be pre-set according to needs to prevent excessive or insufficient dripping of reagent.

[0036] See also Figure 1 and Figure 2 A vertical plate 14 is provided on one side of the horizontal cylinder 16, and an upper positioning ring 10 is connected and fixed to the upper end of the vertical plate 14. The upper positioning ring 10 is sleeved on the transparent cylinder 9 and connected and fixed to the transparent cylinder 9. A lower positioning ring 15 connected and fixed to the horizontal cylinder 16 is sleeved on the horizontal cylinder 16, and the lower positioning ring 15 is connected and fixed to the vertical plate 14. A carrier plate 20 is connected and fixed to the lower end of the vertical plate 14. The carrier plate 20 is sleeved on the liquid storage cylinder 1 and connected and fixed to the liquid storage cylinder 1. Two fixing holes 2 are provided on the upper surface of the carrier plate 20. 1, the lower end of the vertical plate 14 is connected and fixed with an inclined plate 19, and one end of the inclined plate 19 away from the vertical plate 14 is connected and fixed with the carrier plate 20, and the upper positioning ring 10 and the lower positioning ring 15 are connected by the vertical plate 14, so that the upper positioning ring 10 and the lower positioning ring 15 are respectively sleeved on the transparent cylinder 9 and the horizontal cylinder 16, and then the carrier plate 20 is sleeved on the liquid storage cylinder 1, at this time, the carrier plate 20, the vertical plate 14 and other components jointly realize the support of the horizontal cylinder 16 and the transparent cylinder 9, thereby improving the stability of the overall structure.

[0037] See also Figure 5-Figure 8The third piston 36 is provided with two symmetrically arranged limit heads 35 on the side away from the screw 12, and the limit heads 35 are arranged along the length direction of the screw 12. The horizontal length of the connection between the vent valve 8 and the transparent cylinder 9 and the elbow 7 is less than the length of the limit heads 35. The second piston 31 is provided with a blocking rod 30 on the side away from the spring 32, and the blocking rod 30 is arranged along the length direction of the horizontal cylinder 16. The horizontal length of the connection between the lower stop valve 18 and the horizontal cylinder 16 and the closed end of the horizontal cylinder 16 is less than the length of the blocking rod 30. The connection between the upper stop valve 17 and the horizontal cylinder 16 is less than the length of the blocking rod 30. The horizontal length from the closed end of the transverse cylinder 16 is less than the length of the blocking rod 30. The blocking rod 30 is installed on the side of the second piston 31 away from the spring 32. Under the action of the blocking rod 30, the second piston 31 does not move to the connection position between the upper stop valve 17 and the transverse cylinder 16 and the connection position between the lower stop valve 18 and the transverse cylinder 16, which is conducive to the air passing through the upper stop valve 17 and the lower stop valve 18 to enter and exit the transverse cylinder 16. Two limit heads 35 are installed on the third piston 36. Under the restriction of the limit heads 35, the third piston 36 will not move to the connection position between the vent valve 8 and the transparent tube.

[0038] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A titration device, comprising a liquid storage cylinder (1), characterized in that: The lower end of the liquid storage cylinder (1) is provided with a tapered bucket (23) which is wider at the top and narrower at the bottom. The lower end of the tapered bucket (23) is provided with a pipe joint (24). The pipe joint (24) is provided with a titration head (25). The upper end of the liquid storage cylinder (1) is provided with a detachable cylinder cover (4). A vertical hole is provided in the middle of the upper surface of the cylinder cover (4). A pull rod (5) is inserted in the vertical hole. The lower end of the pull rod (5) extends into the liquid storage cylinder (1) and is provided with a first piston (28). The first piston (28) is slidably installed in the liquid storage cylinder (1). A sealing member connected to the cylinder cover (4) is provided on the upper side of the vertical hole. A lower stop valve (18) is provided on the upper surface of the cylinder cover (4). A transverse cylinder (16) is installed at the upper end of the lower stop valve (18), and the upper end of the lower stop valve (18) is connected to and communicates with the closed end of the transverse cylinder (16). A second piston (31) is slidably installed in the transverse cylinder (16). A spring (32) is provided on the side of the second piston (31) away from the connection portion between the lower stop valve (18) and the transverse cylinder (16). The spring (32) is arranged along the length direction of the transverse cylinder (16). A detachable end cover (26) is installed at the open end of the transverse cylinder (16), and one end of the spring (32) away from the second piston (31) is in contact with the end cover (26). A control component for controlling the amount of liquid droplets is installed at the upper position of the closed end of the transverse cylinder (16).

2. A titration device according to claim 1, characterized in that: The control component comprises an upper stop valve (17), an upper stop valve (17) in communication with the horizontal cylinder (16) is installed at an upper position of the closed end of the horizontal cylinder (16), a curved pipe (7) is installed at the upper end of the upper stop valve (17), a transparent cylinder (9) is installed at one end of the curved pipe (7) away from the upper stop valve (17), the transparent cylinder (9) is arranged on the upper side of the horizontal cylinder (16) and the transparent cylinder (9) is arranged parallel to the horizontal cylinder (16), and the outer surface of the transparent cylinder (9) is processed with scale lines arranged along the length direction of the transparent cylinder (9), A detachable blind plate (11) is installed at one end of the transparent tube (9) away from the curved tube (7); a screw rod (12) is threadedly connected at the middle position of one side of the blind plate (11); a third piston (36) is installed at one end of the screw rod (12) located in the transparent tube (9); the third piston (36) is slidably installed in the transparent tube (9); a handle (13) is installed at one end of the screw rod (12) away from the third piston (36); and a vent valve (8) is installed at the upper position of one end of the transparent tube (9) close to the curved tube (7).

3. A titration device according to claim 2, characterized in that: A vertical plate (14) is provided on one side of the horizontal cylinder (16); an upper positioning ring (10) is connected and fixed to the upper end of the vertical plate (14); the upper positioning ring (10) is sleeved on the transparent cylinder (9) and is connected and fixed to the transparent cylinder (9); a lower positioning ring (15) is sleeved on the horizontal cylinder (16) and is connected and fixed to the horizontal cylinder (16); the lower positioning ring (15) is connected and fixed to the vertical plate (14); a carrier plate (20) is connected and fixed to the lower end of the vertical plate (14); the carrier plate (20) is sleeved on the liquid storage cylinder (1) and is connected and fixed to the liquid storage cylinder (1); two fixing holes (21) are provided on the upper surface of the carrier plate (20); an inclined plate (19) is connected and fixed to the lower end of the vertical plate (14); an end of the inclined plate (19) away from the vertical plate (14) is connected and fixed to the carrier plate (20).

4. A titration device according to claim 2, characterized in that: Two symmetrically arranged limit heads (35) are installed on a side of the third piston (36) facing away from the screw rod (12). The limit heads (35) are arranged along the length direction of the screw rod (12). The horizontal length of the connection part between the vent valve (8) and the transparent cylinder (9) and the elbow (7) is less than the length of the limit heads (35).

5. A titration device according to claim 2, characterized in that: An upper connecting ring (37) connected and fixed to the transparent tube (9) is sleeved on one end of the transparent tube (9) away from the bent tube (7); the blind plate (11) is connected to the upper connecting ring (37) by a plurality of bolts; a transverse hole is provided in the middle of one surface of the blind plate (11); a threaded sleeve (27) arranged concentrically with the transverse hole is provided on the outside of the transverse hole; one end of the threaded sleeve (27) is connected and fixed to the blind plate (11); the screw rod (12) is threadedly connected in the threaded sleeve (27); and the screw rod (12) passes through the transverse hole.

6. A titration device according to claim 1, characterized in that: A lower connecting ring (34) connected and fixed to the horizontal cylinder (16) is sleeved on one end of the horizontal cylinder (16) away from the lower stop valve (18); the end cover (26) is connected and fixed to the lower connecting ring (34) by a plurality of bolts; a pipe sleeve (33) is installed at the middle position of a side of the end cover (26) facing the horizontal cylinder (16); the pipe sleeve (33) is inserted in the horizontal cylinder (16); and an end of the spring (32) away from the second piston (31) is inserted in the pipe sleeve (33).

7. A titration device according to claim 1, characterized in that: A blocking rod (30) is installed on the side of the second piston (31) facing away from the spring (32), and the blocking rod (30) is arranged along the length direction of the transverse cylinder (16). The horizontal length of the connection part between the lower stop valve (18) and the transverse cylinder (16) and the closed end of the transverse cylinder (16) is less than the length of the blocking rod (30), and the horizontal length of the connection part between the upper stop valve (17) and the transverse cylinder (16) and the closed end of the transverse cylinder (16) is less than the length of the blocking rod (30).

8. A titration device according to claim 1, characterized in that: The sealing component comprises a support sleeve (22), a support sleeve (22) arranged concentrically with the vertical hole is provided on the upper side of the vertical hole, the lower end of the support sleeve (22) is connected and fixed to the cylinder cover (4), a sealing sleeve is pasted on the inner surface of the support sleeve (22), the sealing sleeve is wrapped around the pull rod (5), and the upper end of the pull rod (5) is connected and fixed with an end head (6).

9. A titration device according to claim 1, characterized in that: A conical head (29) for extending into the conical bucket (23) is connected and fixed to the lower surface of the first piston (28); the conical head (29) and the first piston (28) are an integrally formed structure.

10. A titration device according to claim 1, characterized in that: An end ring (2) is fixedly connected to the upper end of the liquid storage cylinder (1), a sealing ring (3) is provided between the end ring (2) and the cylinder cover (4), and the end ring (2), the cylinder cover (4) and the sealing ring (3) are connected to each other via a plurality of bolts.

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