A titration device

Abstract

The utility model provides a titration device belongs to chemical apparatus technical field, aims at solving the problem of no volumetric flask fixing structure of existing titration device, needing manual shaking volumetric flask. It includes bottom plate, and the bottom plate top sets up column, and the column has the clamp of clamping burette, and the column sliding sleeve sets up mobile seat, and one side of mobile seat is equipped with first screw hole, and the inner screw joint first abutting bolt, and the one end of bolt touches the column side wall, and mobile seat is connected with connecting rod, and one end of connecting rod is equipped with mounting seat, and the mounting seat far from connecting rod end rotates and connects with rotating shaft, and one end of rotating shaft is connected with the fixing device of clamping volumetric flask, and the mounting seat is equipped with the drive device of driving rotating shaft reciprocating rotation. In the utility model, mobile seat, first screw hole and first abutting bolt can flexibly adjust the relative height of volumetric flask and burette, adapt to different specifications of instrument, improve the versatility, drive device, rotating shaft and fixing device can replace manual shaking bottle, avoid hand fatigue, medicine splash injury and mixing insufficient, improve the operation convenience and safety.

Description

Technical Field

[0001] This utility model belongs to the field of chemical instrument technology, specifically relating to a titration device. Background Technology

[0002] Chemical titration analysis, as a core quantitative analytical method in laboratories, is widely used in component detection and water quality analysis in fields such as chemical engineering, pharmaceuticals, environmental protection, and food. Its core function is to determine the content or concentration of a target substance in a solution. The working principle of this method is as follows: a titrant of known concentration is added dropwise to the container holding the solution to be tested, causing a predetermined chemical reaction. When the reaction reaches the stoichiometric point, the titration endpoint is determined by observable changes in the solution (such as a sudden color change, a potential jump, or precipitation). Then, based on the amount of titrant consumed and the stoichiometric relationship of the chemical reaction, the concentration of the analyte is calculated. This method has the advantages of relatively simple operation and high accuracy.

[0003] Currently, the mainstream titration apparatus in laboratories has a relatively simple structure. Its basic components include: a horizontally placed base plate, a vertically fixed column on the base plate, and a clamp that can slide and adjust along the height of the column. This clamp is used to hold the burette so that the dispensing position of the burette can be adjusted according to the height of the volumetric flask. During titration, the volumetric flask is placed on the base plate directly below the burette. The volumetric flask is filled with the solution to be tested. The operator must hold the volumetric flask and continuously shake it manually to ensure that the solution to be tested is fully mixed with the added titrant, ensuring that the reaction proceeds uniformly until the titration endpoint is observed.

[0004] However, the existing titration devices have significant technical defects in practical applications, specifically in the following two aspects:

[0005] 1. The manual shaking operation of volumetric flasks requires operators to maintain hand movements for extended periods, which can easily lead to hand fatigue; furthermore, the shaking force is difficult to control precisely.

[0006] 2. The volumetric flask is placed directly on the base plate without any fixing or restraining structure. During the experiment, accidental contact by personnel, slight vibration of the experimental table, or other external disturbances may cause the volumetric flask to tip over. Utility Model Content

[0007] In view of this, the present invention provides a titration device to solve the problems of existing titration devices lacking a device for fixing the volumetric flask and requiring manual shaking of the volumetric flask.

[0008] The technical solution adopted in this utility model is as follows:

[0009] A titration apparatus includes a base plate, a column at the top of the base plate, a clamp for holding a burette on the column, a movable seat slidably fitted on the burette, a first screw hole on one side of the movable seat, a first clamping bolt screwed into the inner side of the first screw hole, one end of the first clamping bolt contacting the side wall of the column, a connecting rod on the movable seat, a mounting base at one end of the connecting rod, a rotating shaft rotatably connected to the end of the mounting base away from the connecting rod, and a fixing device for holding a volumetric flask fixedly connected to one end of the rotating shaft; the mounting base also includes a driving device for driving the rotating shaft to reciprocate.

[0010] In this technical solution, it should be noted that the base plate provides fundamental support for the entire device, ensuring its overall stability; the column supports the clamp and the movable seat, providing a mounting carrier for subsequent components; the clamp, employing existing technology, is used to clamp and fix the burette, preventing it from shaking or shifting during dispensing; the burette stores and adds titrating reagents of known concentrations to the volumetric flask; the movable seat can slide up and down along the column to adjust the height distance between the volumetric flask and the burette; the first screw hole provides an installation channel for the first clamping bolt, which, by abutting against the side wall of the column, fixes the movable seat on the column; the connecting rod connects the movable seat and the mounting base, transmitting the position adjustment effect; the rotating shaft can rotate around the mounting base, driving the fixing device and the volumetric flask to rotate synchronously; the fixing device clamps and fixes the volumetric flask, preventing it from falling off during rotation; the driving device provides the power for reciprocating rotation of the rotating shaft, replacing manual cranking. Working principle: In use, first fix the burette to the column using the clamp, loosen the first clamping bolt, slide the movable seat up and down along the column, and adjust it to a suitable height so that the volumetric flask can be aligned with the burette dispensing nozzle. Then tighten the first clamping bolt to fix the position of the movable seat. Clamp the volumetric flask containing the solution to be tested using the fixing device, start the drive device, and the drive device will drive the rotating shaft to rotate back and forth around the mounting base (the rotation angle is small, so that the liquid in the volumetric flask will not flow out). The rotating shaft drives the fixing device and the volumetric flask to rotate back and forth synchronously, so that the solution to be tested in the volumetric flask is fully mixed with the reagent added by the burette until the titration endpoint is reached. In this design, the relative height of the volumetric flask and the burette can be flexibly adjusted by the movable seat, the first screw hole, and the first clamping bolt, adapting to volumetric flasks and burettes of different specifications and improving the versatility of the device. The drive device, rotating shaft, and fixing device can replace manual shaking of the volumetric flask, avoiding fatigue caused by prolonged hand movements of the operator. At the same time, it can prevent the reagent from splashing and damaging the skin due to excessive manual shaking force, and also avoid insufficient mixing of the solution due to insufficient force, which would affect the titration accuracy, thus improving the convenience of operation and the safety of use.

[0011] Preferably, a mounting plate is provided on one side of the mounting base, the mounting plate is located above the rotating shaft, and a connecting shaft is rotatably connected to the mounting plate; the driving device includes an incomplete bevel gear, a first bevel gear and a second bevel gear, the incomplete bevel gear is fixedly sleeved on the connecting shaft, the first bevel gear and the second bevel gear are respectively symmetrically fixedly sleeved on the rotating shaft, and the first bevel gear and the second bevel gear can respectively mesh with the incomplete bevel gear, and the connecting shaft is driven by a motor.

[0012] In this technical solution, it should be noted that the mounting plate is fixed on the mounting base, providing mounting support for the connecting shaft and ensuring its stable rotation. The connecting shaft carries the incomplete bevel gear and transmits the motor's power to it. The incomplete bevel gear rotates with the connecting shaft, and its teeth can alternately mesh with the first and second bevel gears to achieve a change in power direction. The first and second bevel gears are symmetrically fixed on the rotating shaft, receiving the power transmitted by the incomplete bevel gears respectively, driving the rotating shaft to rotate in the forward and reverse directions. The motor provides a power source for the drive device, outputting a stable speed. Overall working principle: When the motor is started, it drives the connecting shaft to rotate around the mounting plate, and the connecting shaft drives the incomplete bevel gear to rotate synchronously. When the teeth of the incomplete bevel gear mesh with the first bevel gear, it drives the first bevel gear and the rotating shaft to rotate in the forward direction. When the incomplete bevel gear rotates to the point where its teeth mesh with the second bevel gear, it drives the second bevel gear and the rotating shaft to rotate in the reverse direction. As the incomplete bevel gear continues to rotate, the rotating shaft reciprocates, thereby causing the fixing device and the volumetric flask to oscillate back and forth. In this design, the mounting plate and connecting shaft provide stable mounting and rotational support for the incomplete bevel gear, ensuring stable power transmission. The incomplete bevel gear, the first bevel gear, the second bevel gear, and the motor precisely achieve the reciprocating rotation of the shaft, simulating the action of manually shaking a volumetric flask, ensuring thorough and uniform mixing of the solution and avoiding the problem of uneven force during manual operation. At the same time, the motor drive speed is stable and controllable, and the speed can be adjusted according to experimental needs to further improve the solution mixing effect.

[0013] Preferably, the movable seat is further provided with a mounting hole, which is provided along the width direction of the movable seat. The connecting rod is slidably embedded in the inner side of the mounting hole. The movable seat is also provided with a second screw hole communicating with the mounting hole. The second screw hole is perpendicular to the mounting hole. A second clamping bolt is screwed into the inner side of the second screw hole. One end of the second clamping bolt contacts the side wall of the connecting rod.

[0014] In this technical solution, it should be noted that the mounting hole provides a lateral sliding channel for the connecting rod, allowing the connecting rod to move along the width direction of the moving seat; the connecting rod can slide within the mounting hole to adjust the lateral position of the mounting seat, fixing device, and volumetric flask; the second screw hole provides an installation channel for the second clamping bolt, which, by abutting against the side wall of the connecting rod, fixes the position of the connecting rod within the mounting hole. Working principle: Loosen the second clamping bolt, push or pull the connecting rod along the lateral direction of the mounting hole, causing the mounting seat, fixing device, and volumetric flask to move laterally synchronously. After adjusting until the opening of the volumetric flask is aligned with the drip tip of the burette, tighten the second clamping bolt, making one end of the second clamping bolt in close contact with the side wall of the connecting rod. The frictional force fixes the position of the connecting rod, thereby fixing the lateral position of the volumetric flask. In this design, the horizontal position of the volumetric flask can be flexibly adjusted through the mounting holes, the second screw hole, and the second clamping bolt, ensuring that the volumetric flask is always directly below the burette dispensing nozzle. This prevents reagent waste or leakage from contaminating the work surface due to the dispensing deviating from the volumetric flask. At the same time, it is compatible with volumetric flasks of different diameters, ensuring that the dispensing falls accurately into the volumetric flask, thereby improving the accuracy of titration experiments and the applicability of the device.

[0015] Preferably, the fixing device includes a fixing plate, one end of which is fixedly connected to one end of the rotating shaft, and the other end of the fixing plate is provided with a first arc-shaped clamping plate. A plate body is provided on one side of the fixing plate in the width direction. The plate body is connected to the fixing plate through a connecting plate. A second arc-shaped clamping plate is provided on the plate body, and the plate body is made of an elastic material. The fixing device also includes a moving device for driving the second arc-shaped clamping plate to move in a direction close to or away from the first arc-shaped clamping plate.

[0016] In this technical solution, it should be noted that the volumetric flask is placed between the first and second arc-shaped clamps. The second arc-shaped clamp is moved closer to the first arc-shaped clamp by a moving device until the two arc-shaped clamps are in close contact with the outer wall of the volumetric flask. The plate made of elastic material deforms slightly with the diameter of the volumetric flask to ensure that the volumetric flask is clamped. After the experiment, the second arc-shaped clamp is moved away from the first arc-shaped clamp by a moving device, and the volumetric flask can be released and taken out.

[0017] Preferably, the moving device includes a screw, one end of which is connected to a fixed plate, and the other end of which slides through the plate. A nut is screwed onto the screw, and the nut is located on the side of the plate away from the fixed plate.

[0018] In this technical solution, it should be noted that when loosening the nut, the nut moves away from the fixed plate along the screw, and the plate loses the thrust of the nut, allowing it to slide away from the fixed plate along the screw, thus moving the second arc-shaped clamp away from the first arc-shaped clamp, facilitating the insertion or removal of the volumetric flask. When tightening the nut, the nut moves towards the fixed plate along the screw, pushing the plate towards the fixed plate. The plate then moves the second arc-shaped clamp closer to the first arc-shaped clamp until the volumetric flask is clamped. The screw and nut design results in a simple structure and convenient operation. Utilizing the self-locking property of the threaded drive, tightening the nut stably maintains the position of the second arc-shaped clamp, preventing the volumetric flask from loosening after clamping. Simultaneously, the threaded drive allows for precise adjustment of the movement distance of the second arc-shaped clamp, ensuring appropriate clamping force. This ensures the volumetric flask is securely fixed while preventing damage, improving the ease of operation and clamping stability of the fixing device.

[0019] Preferably, a washer is also fitted onto the screw, and the washer is located between the nut and the plate.

[0020] In this technical solution, it should be noted that the gaskets can effectively protect the plate made of elastic material, prevent the plate from being damaged by the nut, and extend the service life of the plate; at the same time, they can distribute the pressure to make the plate evenly stressed, avoid local deformation of the plate affecting the position of the second arc-shaped clamp, ensure that the volumetric flask is firmly clamped, and improve the durability and stability of the fixing device.

[0021] Preferably, a spring is provided between the plate and the fixing plate.

[0022] In this technical solution, it should be noted that the spring can assist the plate to automatically reset, eliminating the need to manually pull the plate and improving the ease of operation. At the same time, the spring's buffering effect can prevent the clamping force from being too large and damaging the volumetric flask. It can also absorb some vibration during the shaking of the volumetric flask, reducing the shaking amplitude of the volumetric flask and further improving the stability of the volumetric flask and ensuring experimental safety.

[0023] Preferably, the bottom of the base plate is provided with support legs.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0025] 1. In this utility model, the relative height of the volumetric flask and the burette can be flexibly adjusted by the movable seat, the first screw hole and the first clamping bolt, which can be adapted to volumetric flasks and burettes of different specifications, thus improving the versatility of the device; the driving device, the rotating shaft and the fixing device can replace manual shaking of the volumetric flask, avoiding fatigue caused by prolonged hand movements of the operator, while preventing the medicine from splashing and damaging the skin due to excessive manual shaking force, and also preventing insufficient mixing of the solution due to insufficient force, which would affect the titration accuracy, thus improving the convenience of operation and the safety of use;

[0026] 2. In this invention, the mounting plate and connecting shaft provide stable mounting and rotational support for the incomplete bevel gear, ensuring stable power transmission. The incomplete bevel gear, the first bevel gear, the second bevel gear, and the motor enable precise reciprocating rotation of the shaft, simulating the action of manually shaking a volumetric flask, ensuring thorough and uniform mixing of the solution, and avoiding the problem of uneven force during manual operation. At the same time, the motor drive speed is stable and controllable, and the speed can be adjusted according to experimental needs to further improve the solution mixing effect. Attached Figure Description

[0027] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0028] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0029] Figure 2 This is a three-dimensional structural diagram of the movable base and mounting base of this utility model;

[0030] Figure 3 This is a three-dimensional structural diagram of the mounting base of this utility model;

[0031] Figure 4 This is a three-dimensional structural diagram of the disassembled movable base of this utility model;

[0032] Figure 5 for Figure 4 A schematic diagram of the oblique stereoscopic structure;

[0033] Figure 6 This is a three-dimensional structural diagram of the fixing device of this utility model;

[0034] Wherein: 100-base plate, 101-support leg, 200-column, 300-clamp, 400-burette, 500-moving seat, 501-first screw hole, 502-first clamping bolt, 503-mounting hole, 504-second clamping bolt, 505-second screw hole, 600-mounting seat, 700-fixing device, 701-fixing plate, 702-plate body, 703-connecting plate, 704-screw, 705-nut, 706-washer, 707-spring, 708-first arc-shaped clamping plate, 709-second arc-shaped clamping plate, 800-connecting rod, 900-rotating shaft, 901-first bevel gear, 902-second bevel gear, 903-connecting shaft, 904-incomplete bevel gear, 905-motor, 906-mounting plate. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0041] Example

[0042] like Figures 1-6As shown in the figure, a titration apparatus is disclosed in this embodiment of the present invention, including a base plate 100, a column 200 on the top of the base plate 100, a clamp 300 for holding a burette 400 on the column 200, a movable seat 500 slidably sleeved on the burette 400, a first screw hole 501 on one side of the movable seat 500, a first clamping bolt 502 screwed into the inner side of the first screw hole 501, one end of the first clamping bolt 502 contacting the side wall of the column 200, a connecting rod 800 on the movable seat 500, a mounting base 600 on one end of the connecting rod 800, a rotating shaft 900 rotatably connected to the end of the mounting base 600 away from the connecting rod 800, a fixing device 700 for holding a volumetric flask fixedly connected to one end of the rotating shaft 900, and a driving device for driving the rotating shaft 900 to reciprocate. It should be noted that the base plate 100 provides basic support for the entire device, ensuring its overall stability; the column 200 supports the clamp 300 and the movable seat 500, providing a mounting carrier for subsequent components; the clamp 300, using existing technology, is used to clamp and fix the burette 400, preventing it from shaking or shifting during the dispensing process; the burette 400 is used to store and add titration reagents of known concentrations to the volumetric flask; the movable seat 500 can slide up and down along the column 200 to adjust the height distance between the volumetric flask and the burette 400; the first screw hole 501 is... The first clamping bolt 502 provides an installation channel. By clamping against the side wall of the column 200, the first clamping bolt 502 fixes the position of the movable seat 500 on the column 200. The connecting rod 800 connects the movable seat 500 and the mounting seat 600 to transmit the position adjustment effect. The rotating shaft 900 can rotate around the mounting seat 600 to drive the fixing device 700 and the volumetric flask to rotate synchronously. The fixing device 700 is used to clamp and fix the volumetric flask to prevent it from falling off during rotation. The driving device is used to provide the power for the reciprocating rotation of the rotating shaft 900, replacing the manual cranking action. Working principle: In use, first fix the burette 400 to the column 200 using the clamp 300, loosen the first clamping bolt 502, slide the moving seat 500 up and down along the column 200, adjust it to a suitable height so that the volumetric flask can be aligned with the dripping port of the burette 400, and then tighten the first clamping bolt 502 to fix the position of the moving seat 500; clamp the volumetric flask containing the solution to be tested using the fixing device 700, start the drive device, and the drive device drives the rotating shaft 900 to rotate back and forth around the mounting base 600 (the rotation angle is small, so that the liquid in the volumetric flask will not flow out). The rotating shaft 900 drives the fixing device 700 and the volumetric flask to rotate back and forth synchronously, so that the solution to be tested in the volumetric flask is fully mixed with the reagent dripped into the burette 400 until the titration endpoint is reached.In this design, the relative height of the volumetric flask and the burette 400 can be flexibly adjusted by the movable seat 500, the first screw hole 501, and the first clamping bolt 502, adapting to volumetric flasks and burettes 400 of different specifications and improving the versatility of the device. The drive device, the rotating shaft 900, and the fixing device 700 can replace manual shaking of the volumetric flask, avoiding fatigue caused by prolonged hand movements of the operator. At the same time, it can prevent the reagent from splashing and damaging the skin due to excessive manual shaking force, and also prevent insufficient mixing of the solution due to insufficient force, which would affect the titration accuracy, thus improving the convenience of operation and the safety of use.

[0043] like Figure 2 and Figure 3As shown, in this embodiment, a mounting plate 906 is provided on one side of the mounting base 600. The mounting plate 906 is located above the rotating shaft 900, and a connecting shaft 903 is rotatably connected to the mounting plate 906. The driving device includes an incomplete bevel gear 904, a first bevel gear 901, and a second bevel gear 902. The incomplete bevel gear 904 is fixedly sleeved on the connecting shaft 903. The first bevel gear 901 and the second bevel gear 902 are symmetrically fixedly sleeved on the rotating shaft 900, and the first bevel gear 901 and the second bevel gear 902 can mesh with the incomplete bevel gear 904 respectively. The connecting shaft 903 is driven by a motor 905. It should be noted that the mounting plate 906 is fixed on the mounting base 600, providing mounting support for the connecting shaft 903 and ensuring the stable rotation of the connecting shaft 903; the connecting shaft 903 is used to carry the incomplete bevel gear 904 and transmit the power of the motor 905 to the incomplete bevel gear 904; the incomplete bevel gear 904 rotates with the connecting shaft 903, and its gear teeth can alternately mesh with the first bevel gear 901 and the second bevel gear 902 to realize the conversion of power direction; the first bevel gear 901 and the second bevel gear 902 are symmetrically fixed on the rotating shaft 900, respectively receiving the power transmitted by the incomplete bevel gear 904, driving the rotating shaft 900 to rotate in the forward and reverse directions; the motor 905 provides a power source for the drive device and outputs a stable speed. Overall working principle: Start the motor 905, which drives the connecting shaft 903 to rotate around the mounting plate 906. The connecting shaft 903 drives the incomplete bevel gear 904 to rotate synchronously. When the teeth of the incomplete bevel gear 904 mesh with the first bevel gear 901, it drives the first bevel gear 901 and the rotating shaft 900 to rotate in the forward direction. When the incomplete bevel gear 904 rotates until the teeth mesh with the second bevel gear 902, it drives the second bevel gear 902 and the rotating shaft 900 to rotate in the reverse direction. As the incomplete bevel gear 904 continues to rotate, the rotating shaft 900 reciprocates, thereby driving the fixed device 700 and the volumetric flask to sway back and forth. In this design, the mounting plate 906 and connecting shaft 903 provide stable mounting and rotational support for the incomplete bevel gear 904, ensuring stable power transmission. The incomplete bevel gear 904, first bevel gear 901, second bevel gear 902, and motor 905 precisely achieve the reciprocating rotation of the shaft 900, simulating the action of manually shaking a volumetric flask, ensuring thorough and uniform solution mixing and avoiding uneven manual operation. Simultaneously, the motor 905 provides a stable and controllable driving speed, which can be adjusted according to experimental requirements to further improve the solution mixing effect.

[0044] like Figure 4 and Figure 5As shown, in this embodiment, the movable base 500 is further provided with a mounting hole 503, which is arranged along the width direction of the movable base 500. The connecting rod 800 is slidably embedded in the inner side of the mounting hole 503. The movable base 500 is also provided with a second screw hole 505 communicating with the mounting hole 503. The second screw hole 505 is perpendicular to the mounting hole 503. A second clamping bolt 504 is screwed into the inner side of the second screw hole 505. One end of the second clamping bolt 504 contacts the side wall of the connecting rod 800. It should be noted that the mounting hole 503 provides a lateral sliding channel for the connecting rod 800, allowing the connecting rod 800 to move along the width direction of the movable seat 500; the connecting rod 800 can slide within the mounting hole 503 to adjust the lateral position of the mounting seat 600, the fixing device 700, and the volumetric flask; the second screw hole 505 provides an installation channel for the second clamping bolt 504, which, by abutting against the side wall of the connecting rod 800, fixes the position of the connecting rod 800 within the mounting hole 503. Working principle: Loosen the second clamping bolt 504, push or pull the connecting rod 800 along the lateral direction of the mounting hole 503, causing the mounting seat 600, the fixing device 700, and the volumetric flask to move laterally synchronously. After adjusting until the opening of the volumetric flask is aligned with the drip nozzle of the burette 400, tighten the second clamping bolt 504, making one end of the second clamping bolt 504 in close contact with the side wall of the connecting rod 800, fixing the position of the connecting rod 800 through friction, thereby fixing the lateral position of the volumetric flask. In this design, the horizontal position of the volumetric flask can be flexibly adjusted through the mounting hole 503, the second screw hole 505, and the second clamping bolt 504, ensuring that the volumetric flask is always directly below the dispensing nozzle of the burette 400. This avoids reagent waste or leakage that could contaminate the work surface due to the dispensing deviating from the volumetric flask. At the same time, it is compatible with volumetric flasks of different diameters, ensuring that the dispensing falls accurately into the volumetric flask, thereby improving the accuracy of titration experiments and the applicability of the apparatus.

[0045] like Figure 6As shown, in this embodiment, the fixing device 700 includes a fixing plate 701, one end of which is fixedly connected to one end of the rotating shaft 900, and the other end of which is provided with a first arc-shaped clamping plate 708. A plate body 702 is provided on one side of the fixing plate 701 in the width direction. The plate body 702 is connected to the fixing plate 701 through a connecting plate 703. A second arc-shaped clamping plate 709 is provided on the plate body 702, and the plate body 702 is made of an elastic material. The fixing device 700 also includes a moving device for driving the second arc-shaped clamping plate 709 to move in a direction close to or away from the first arc-shaped clamping plate 708. It should be noted that the volumetric flask is placed between the first arc-shaped clamp 708 and the second arc-shaped clamp 709. The second arc-shaped clamp 709 is moved closer to the first arc-shaped clamp 708 by the moving device until the two arc-shaped clamps are in close contact with the outer wall of the volumetric flask. The plate 702 made of elastic material deforms slightly with the diameter of the volumetric flask to ensure that the volumetric flask is clamped. After the experiment, the second arc-shaped clamp 709 is moved away from the first arc-shaped clamp 708 by the moving device, and the volumetric flask can be released and taken out.

[0046] like Figure 6 As shown, in this embodiment, the moving device includes a screw 704, one end of which is connected to a fixed plate 701, and the other end of which slides through the plate 702. A nut 705 is screwed onto the screw 704, and the nut 705 is located on the side of the plate 702 away from the fixed plate 701. It should be noted that when the nut 705 is loosened, the nut 705 moves away from the fixed plate 701 along the screw 704, and the plate 702 loses the thrust of the nut 705 and can slide away from the fixed plate 701 along the screw 704, so that the second arc-shaped clamp 709 moves away from the first arc-shaped clamp 708, making it easier to put in or take out the volumetric flask; when the nut 705 is tightened, the nut 705 moves closer to the fixed plate 701 along the screw 704, pushing the plate 702 to slide towards the fixed plate 701, and the plate 702 drives the second arc-shaped clamp 709 to move closer to the first arc-shaped clamp 708 until the volumetric flask is clamped. With the screw 704 and nut 705, the structure is simple and easy to operate. Utilizing the self-locking property of the threaded drive, tightening the nut 705 can stably maintain the position of the second arc-shaped clamp 709, preventing the volumetric flask from loosening after clamping. At the same time, the threaded drive can precisely adjust the moving distance of the second arc-shaped clamp 709 to ensure that the clamping force is moderate, which not only ensures that the volumetric flask is firmly fixed, but also avoids damage to the volumetric flask, thereby improving the ease of operation and clamping stability of the fixing device 700.

[0047] like Figure 6As shown, in this embodiment, a washer 706 is also fitted onto the screw 704, and the washer 706 is located between the nut 705 and the plate 702. It should be noted that the washer 706 effectively protects the plate 702 made of elastic material, preventing the plate 702 from being damaged by the compression of the nut 705, and extending the service life of the plate 702; at the same time, it disperses the pressure so that the plate 702 is subjected to force evenly, avoiding local deformation of the plate 702 from affecting the position of the second arc-shaped clamping plate 709, ensuring that the volumetric flask is firmly clamped, and improving the durability and stability of the fixing device 700.

[0048] like Figure 6 As shown, in this embodiment, a spring 707 is provided between the plate 702 and the fixing plate 701. It should be noted that the spring 707 assists the plate 702 in automatically resetting, eliminating the need for manual pulling of the plate 702 and improving operational convenience. Simultaneously, the buffering effect of the spring 707 prevents damage to the volumetric flask from excessive clamping force, and also absorbs some vibration during flask shaking, reducing the flask's shaking amplitude and further improving the stability of the volumetric flask's fixation, ensuring experimental safety.

[0049] like Figure 1 As shown, in this embodiment, the bottom of the base plate 100 is provided with a support leg 101.

[0050] The working principle of this utility model is as follows:

[0051] When using this titration apparatus, first place the apparatus on the experimental table using the support legs 101 at the bottom of the base plate 100, and adjust the support legs 101 to ensure that the base plate 100 is horizontal, providing stable support for the apparatus. Next, place the burette 400 in the clamp 300 of the column 200, and clamp the burette 400 to prevent it from shaking or shifting during dispensing.

[0052] Then loosen the first clamping bolt 502 in the first screw hole 501 on one side of the movable seat 500, slide the movable seat 500 up and down along the column 200, adjust the position according to the height of the volumetric flask, so that the volumetric flask to be fixed later can be aligned with the drip port of the burette 400, tighten the first clamping bolt 502, and fix the movable seat 500 by the clamping force between the bolt and the side wall of the column 200.

[0053] Loosen the second clamping bolt 504 in the second screw hole 505 on the movable seat 500 that communicates with the mounting hole 503. Push or pull the connecting rod 800 laterally along the mounting hole 503. The connecting rod 800 drives the mounting seat 600, the rotating shaft 900 and the fixing device 700 to move synchronously. Adjust the volumetric flask opening that is subsequently clamped by the fixing device 700 so that it is aligned with the drip port of the burette 400. Then tighten the second clamping bolt 504. Fix the connecting rod 800 by the friction between the bolt and the side wall of the connecting rod 800, thereby fixing the lateral position of the volumetric flask.

[0054] Next, operate the fixing device 700 to fix the volumetric bottle: first loosen the nut 705 on the screw 704 in the moving device. At this time, the spring 707 between the plate 702 and the fixing plate 701 releases elastic potential energy, pulling the plate 702 to move away from the fixing plate 701 along the screw 704. The plate 702 drives the second arc-shaped clamping plate 709 away from the first arc-shaped clamping plate 708 at the other end of the fixing plate 701. The volumetric flask containing the solution to be tested is placed between the first arc-shaped clamp 708 and the second arc-shaped clamp 709. Then, the nut 705 is tightened. The nut 705 moves along the screw 704 toward the fixed plate 701. The pressure is evenly transmitted to the plate 702 through the washer 706 fitted on the screw 704. Under the pushing force of the nut 705, the plate 702 moves along the screw 704 toward the fixed plate 701, compressing the spring 707 and driving the second arc-shaped clamp 709 toward the first arc-shaped clamp 708 until both arc-shaped clamps are in close contact with the outer wall of the volumetric flask. The plate 702, made of elastic material, deforms slightly with the diameter of the volumetric flask, thus firmly clamping the volumetric flask and preventing it from moving.

[0055] When the drive unit is started, the motor 905 is energized, driving the connecting shaft 903 on the mounting plate 906 to rotate. The connecting shaft 903 drives the incomplete bevel gear 904 to rotate synchronously. When the teeth of the incomplete bevel gear 904 mesh with the first bevel gear 901 on the rotating shaft 900, it drives the first bevel gear 901 and the rotating shaft 900 to rotate in the forward direction. When the incomplete bevel gear 904 continues to rotate until its teeth mesh with the second bevel gear 902, it drives the second bevel gear 902 and the rotating shaft 900 to rotate in the reverse direction. As the incomplete bevel gear 904 continues to rotate, the rotating shaft 900 reciprocates, with a small rotation angle to prevent the liquid in the volumetric flask from flowing out. The rotating shaft 900 drives the fixing device 700 and the clamped volumetric flask to reciprocate synchronously, ensuring that the solution to be tested in the volumetric flask is thoroughly mixed with the titrant of known concentration added by the burette 400.

[0056] During the experiment, observe the changes in the solution. When the solution reaches the titration endpoint, turn off motor 905 to stop the drive device and simultaneously stop the addition of titrant. After the experiment, loosen nut 705 on screw 704 in fixing device 700. Spring 707 releases elastic potential energy to pull plate 702 back to its original position, causing the second arc-shaped clamp 709 to move away from the first arc-shaped clamp 708. Remove the volumetric flask to complete one titration experiment.

[0057] The circuits, electronic components, and modules involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this utility model does not involve any improvement to the software and methods.

[0058] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0059] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A titration apparatus, characterized in that, Includes a base plate (100), a column (200) on the top of the base plate (100), a clamp (300) for holding a burette (400) on the column (200), a movable seat (500) slidably sleeved on the burette (400), a first screw hole (501) on one side of the movable seat (500), a first clamping bolt (502) screwed into the inner side of the first screw hole (501), one end of the first clamping bolt (502) contacting the side wall of the column (200), a connecting rod (800) on the movable seat (500), a mounting seat (600) on one end of the connecting rod (800), a rotating shaft (900) rotatably connected to the end of the mounting seat (600) away from the connecting rod (800), and a fixing device (700) for holding a volumetric flask fixedly connected to one end of the rotating shaft (900). The mounting base (600) is also provided with a drive device for driving the rotating shaft (900) to reciprocate.

2. The titration apparatus according to claim 1, characterized in that, A mounting plate (906) is provided on one side of the mounting base (600). The mounting plate (906) is located above the rotating shaft (900), and a connecting shaft (903) is rotatably connected to the mounting plate (906). The driving device includes an incomplete bevel gear (904), a first bevel gear (901), and a second bevel gear (902). The incomplete bevel gear (904) is fixedly sleeved on the connecting shaft (903). The first bevel gear (901) and the second bevel gear (902) are respectively symmetrically fixedly sleeved on the rotating shaft (900). The first bevel gear (901) and the second bevel gear (902) can respectively mesh with the incomplete bevel gear (904). The connecting shaft (903) is driven by a motor (905).

3. The titration apparatus according to claim 1, characterized in that, The movable base (500) is also provided with a through mounting hole (503), which is set along the width direction of the movable base (500). The connecting rod (800) is slidably embedded in the inner side of the mounting hole (503). The movable base (500) is also provided with a second screw hole (505) communicating with the mounting hole (503). The second screw hole (505) is perpendicular to the mounting hole (503). A second clamping bolt (504) is screwed into the inner side of the second screw hole (505). One end of the second clamping bolt (504) contacts the side wall of the connecting rod (800).

4. The titration apparatus according to claim 1, characterized in that, The fixing device (700) includes a fixing plate (701), one end of which is fixedly connected to one end of a rotating shaft (900), and the other end of the fixing plate (701) is provided with a first arc-shaped clamping plate (708). A plate body (702) is provided on one side of the fixing plate (701) in the width direction. The plate body (702) is connected to the fixing plate (701) through a connecting plate (703). A second arc-shaped clamping plate (709) is provided on the plate body (702), and the plate body (702) is made of an elastic material. The fixing device (700) also includes a moving device for driving the second arc-shaped clamp (709) to move in a direction close to or away from the first arc-shaped clamp (708).

5. A titration apparatus according to claim 4, characterized in that, The moving device includes a screw (704), one end of which is connected to a fixed plate (701), and the other end of which slides through the plate (702). A nut (705) is screwed onto the screw (704), and the nut (705) is located on the side of the plate (702) away from the fixed plate (701).

6. A titration apparatus according to claim 5, characterized in that, A washer (706) is also fitted on the screw (704), and the washer (706) is located between the nut (705) and the plate (702).

7. A titration apparatus according to claim 6, characterized in that, A spring (707) is provided between the plate (702) and the fixing plate (701).

8. A titration apparatus according to claim 6, characterized in that, The bottom of the base plate (100) is provided with a support leg (101).

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