Laboratory solution ph precision detection titration device

Abstract

The utility model relates to experimental instrument technical field discloses laboratory solution pH precision detection titration device, including the placing rack, the inside of placing rack is opened and has the mounting hole, the inside of placing rack is slidably installed with the connecting rod, the connecting rod is installed in the inside of mounting hole, the outer surface of connecting rod is sleeved with the elastic part, the bottom of connecting rod is rotated and is sleeved with the adapter disc to the bottom of placing rack, the top of adapter disc is fixedly installed with the butt joint cover, the inside of adapter disc is opened and has the through -going hole, the bottom of butt joint cover is installed with the sieve plate. In the utility model, the connecting ring is extruded the elastic part to make the adapter disc move down by pressing the connecting rod, the butt joint cover is separated from the liquid outlet at the bottom of the burette, then the adapter disc is rotated to change the butt joint cover and the liquid outlet at the bottom of the burette, the solution drop speed is changed through the sieve plate of different leak holes in the butt joint cover, and the solution drop amount is accurately controlled.

Description

Technical Field

[0001] This utility model relates to the field of experimental instrument technology, and in particular to a titration device for precise detection of the acidity and alkalinity of laboratory solutions. Background Technology

[0002] The laboratory solution acidity and alkalinity titration device is an analytical instrument based on the principle of volumetric analysis, consisting of components such as a burette, titration stage, and conical flask. By precisely controlling the titration rate and volume of the standard titrant, a quantitative chemical reaction occurs between the titrant and the target component in the sample. The titration endpoint is determined by the color change of the indicator, and then the concentration of the target component in the sample is calculated.

[0003] Burettes are usually vertically mounted above the titration stand, allowing the outlet at the bottom of the burette to be positioned above the conical flask. When the acid or alkaline solution inside the conical flask is about to reach the titration endpoint, the dripping speed of the burette is difficult to adjust. If the dripping speed is too fast, the endpoint of the acid or alkaline solution titration will be inaccurate. Therefore, there is an urgent need for a precise titration device for detecting the acidity or alkalinity of laboratory solutions. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a laboratory solution acidity and alkalinity accurate titration device, which aims to improve the problem that the dripping speed of the burette is not easy to adjust and that too fast a dripping speed will lead to inaccurate determination of the titration endpoint of acid and alkaline solutions.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a laboratory solution acidity and alkalinity accurate titration device, including a placement rack, a placement opening inside the placement rack, an installation opening inside the placement rack, a connecting rod slidably installed inside the placement rack, the connecting rod installed inside the installation opening, an elastic element sleeved on the outer surface of the connecting rod, a limiting plate fixedly installed through the top of the connecting rod to the top of the placement rack, a transition plate rotatably sleeved through the bottom of the connecting rod to the bottom of the placement rack, a docking sleeve fixedly installed on the top of the transition plate, a through opening inside the transition plate, a drain plate installed at the bottom of the docking sleeve, and the drain plate disposed inside the through opening.

[0006] The above technical solution allows the connecting rod to be slidably inserted into the inside of the placement frame. The placement frame has an installation opening located outside the connecting rod, with the diameter of the installation opening being larger than that of the connecting rod. This allows the elastic element to be fitted onto the outer surface of the connecting rod. The bottom end of the elastic element is installed on the bottom of the inner wall of the installation opening, and the top end of the elastic element is installed on the bottom of the connecting ring. The connecting ring is rotatably engaged in the annular groove on the outer surface of the connecting rod, allowing the connecting rod to rotate inside the connecting ring. An upper limit plate is fixedly installed on the top of the connecting rod to prevent the top of the connecting rod from moving down into the inside of the placement frame.

[0007] Preferably, the bottom of the elastic element is fixedly installed on the bottom of the inner wall of the mounting port, the top of the elastic element is equipped with a connecting ring, the outer surface of the connecting rod is provided with a ring groove, and the connecting ring is rotatably installed inside the ring groove.

[0008] Preferably, a burette is installed on the top of the docking sleeve, and the burette is inserted into the placement port.

[0009] Preferably, multiple through-holes are provided, and the multiple through-holes are located inside the adapter plate and distributed in a circular array.

[0010] Preferably, the top of the placement rack has a slot, the bottom of the placement rack is equipped with a stirring rod, the top of the stirring rod extends into the inside of the slot and a rotating tooth is installed thereon, the top of the rotating tooth is rotatably mounted with a fixing plate, and the fixing plate is fixedly installed on the inner wall of the slot.

[0011] Preferably, the first rotating tooth meshes with a second rotating tooth, the second rotating tooth is rotatably mounted on the bottom of the inner wall of the slot, and a drive motor is mounted on the top of the second rotating tooth.

[0012] Preferably, a slider is fixedly installed on the side of the placement rack away from the burette, an installation rod is slidably installed inside the slider, and a titration stage is fixedly installed at the bottom of the installation rod.

[0013] Preferably, the slider has a threaded post threadedly connected to the side away from the mounting bracket, and the end of the threaded post near the slider passes through the slider and extends to the outer wall of the mounting rod.

[0014] This utility model has the following beneficial effects: 1. In this utility model, pressing the connecting rod can drive the connecting ring to squeeze the elastic element, causing the adapter plate to move down and disengage the docking sleeve from the bottom outlet of the burette. Then, rotating the adapter plate changes the docking sleeve to connect with the bottom outlet of the burette. By changing the dripping speed of the solution through the leak plates with different leak holes inside the docking sleeve, the amount of solution dripping can be precisely controlled.

[0015] 2. In this utility model, when the drive motor is powered on, it can drive the second rotating gear to rotate, which in turn drives the first rotating gear and the stirring rod to rotate. The stirring rod is then inserted into the conical flask to stir the acid and alkali solutions, which facilitates solution mixing, color observation, and determination of the titration endpoint. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the laboratory solution acidity and alkalinity accurate detection titration device proposed in this utility model. Figure 2 This is a schematic diagram of the exploded structure of the transfer plate of the laboratory solution acidity and alkalinity accurate detection titration device proposed in this utility model. Figure 3 This is a schematic cross-sectional view of the connecting rod of the laboratory solution acidity and alkalinity accurate detection titration device proposed in this utility model. Figure 4 This is a schematic diagram of the rotating teeth of the titration device for accurate detection of the acidity and alkalinity of laboratory solutions proposed in this utility model.

[0017] Legend: 1. Placement rack; 11. Placement port; 101. Mounting port; 102. Connecting rod; 103. Elastic element; 104. Limiting plate; 105. Adapter plate; 106. Connecting sleeve; 107. Through port; 108. Strainer plate; 2. Connecting ring; 21. Ring groove; 3. Burette; 4. Stirring rod; 41. Rotating tooth one; 42. Fixing plate; 43. Rotating tooth two; 44. Drive motor; 5. Slider; 51. Mounting rod; 52. Dosing stage; 53. Threaded column. Detailed Implementation

[0018] 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, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] Reference Figure 1-3 An embodiment of this utility model provides a laboratory solution acidity and alkalinity precision titration device, including a placement rack 1, a placement opening 11 inside the placement rack 1, an installation opening 101 inside the placement rack 1, a connecting rod 102 slidably installed inside the placement rack 1, the connecting rod 102 installed inside the installation opening 101, an elastic element 103 sleeved on the outer surface of the connecting rod 102, a limiting plate 104 fixedly installed through the top of the connecting rod 102 to the top of the placement rack 1, the bottom of the connecting rod 102 rotatably sleeved through the bottom of the placement rack 1, a connecting plate 105 fixedly installed on the top of the connecting plate 105, a through opening 107 inside the connecting plate 105, a drain plate 108 installed at the bottom of the connecting plate 106, and the drain plate 108 disposed inside the through opening 107.

[0020] The bottom of the elastic element 103 is fixedly installed on the bottom of the inner wall of the mounting port 101, and the top of the elastic element 103 is equipped with a connecting ring 2. The outer surface of the connecting rod 102 is provided with a ring groove 21, and the connecting ring 2 is rotatably installed inside the ring groove 21.

[0021] A burette 3 is installed on the top of the docking sleeve 106, and the burette 3 is inserted into the placement port 11.

[0022] Multiple through-holes 107 are provided, and the multiple through-holes 107 are located inside the adapter plate 105 and are distributed in a circular array.

[0023] Specifically, the placement rack 1 has a through-hole conical placement port 11. The conical head at the bottom of the burette 3 can be inserted into the placement port 11 for positioning and fixation. The bottom of the burette 3 extends through to the bottom of the placement rack 1. The connecting rod 102 is slidably inserted into the placement rack 1. The placement rack 1 has an installation port 101 located outside the connecting rod 102. The diameter of the installation port 101 is larger than that of the connecting rod 102, allowing the elastic element 103 to be fitted onto the outer surface of the connecting rod 102. The bottom end of the elastic element 103 is installed on the bottom of the inner wall of the installation port 101, and the top end of the elastic element 103 is installed on the bottom of the connecting ring 2. The connecting ring 2 is rotatably engaged in the annular groove 21 on the outer surface of the connecting rod 102, allowing the connecting rod 102 to rotate within the connecting ring 2. An upper limit plate 104 is fixedly installed on the top of the connecting rod 102 to prevent the top of the connecting rod 102 from moving down into the placement rack 1. A transfer plate 105 is also included. The connecting rod 102 is rotated and fitted onto the outer surface of the connecting rod 102. Multiple connecting sleeves 106 are fixedly installed on the top of the adapter plate 105. The inner wall of the connecting sleeve 106 is made of fluororubber material, which allows the liquid outlet at the bottom of the burette 3 to be tightly connected to the inside of the connecting sleeve 106. Thus, the solution dripping from the bottom of the burette 3 can drip down from the through-hole 107 and the drain plate 108 at the bottom of the connecting sleeve 106. The drain plates 108 installed inside the multiple through-holes 107 have different hole sizes, which can change the dripping speed of the solution in the burette 3. By pressing the connecting rod 102, the connecting ring 2 is driven to squeeze the elastic element 103, causing the adapter plate 105 to move down and disengage the connecting sleeve 106 from the liquid outlet at the bottom of the burette 3. Then, by rotating the adapter plate 105, different connecting sleeves 106 are connected to the liquid outlet at the bottom of the burette 3. Thus, the burette 3 can change the dripping speed of the solution by using the drain plates 108 at the bottom of different connecting sleeves 106, thereby achieving precise control of the solution dripping volume.

[0024] It should be noted that the elastic element 103 is a metal helical spring. The elastic element 103 is pressed and installed inside the mounting port 101, which can press the connecting sleeve 106 of the pull adapter plate 105 against the liquid outlet of the burette 3.

[0025] Considering the need to shake and stir the mixed solution during acid-base titration, refer to Figure 1 and Figure 4 The top of the placement rack 1 is provided with a slot, and the bottom of the placement rack 1 is provided with a stirring rod 4. The top of the stirring rod 4 extends through the inside of the slot and is provided with a rotating tooth 41. The top of the rotating tooth 41 is rotatably mounted with a fixing plate 42, which is fixedly installed on the inner wall of the slot.

[0026] Rotary tooth 41 meshes with rotary tooth 43, which is rotatably mounted on the bottom of the inner wall of the slot, and a drive motor 44 is mounted on the top of rotary tooth 43.

[0027] Specifically, a slot is opened in the placement rack 1, so that the top of the first rotating tooth 41 can be rotatably installed at the bottom of the fixed plate 42, so that the stirring rod 4 passes through the bottom of the placement rack 1 into the inside of the slot and connects with the bottom of the first rotating tooth 41. The second rotating tooth 43 is rotatably installed at the bottom of the inner wall of the slot, and the second rotating tooth 43 meshes with the first rotating tooth 41. When the drive motor 44 is powered on, it can drive the second rotating tooth 43 to rotate, and then the second rotating tooth 43 drives the first rotating tooth 41 and the stirring rod 4 to rotate. The stirring rod 4 is T-shaped, so that the stirring rod 4 can be inserted into the inside of the conical flask to stir the acid and alkali solutions.

[0028] Secondly, considering the question of how to install burette 3, refer to... Figure 1 A slider 5 is fixedly installed on the side of the holder 1 away from the burette 3. An installation rod 51 is slidably installed inside the slider 5. A titration stage 52 is fixedly installed at the bottom of the installation rod 51.

[0029] The slider 5 is threaded with a threaded post 53 on the side away from the mounting bracket 1. The end of the threaded post 53 near the slider 5 passes through the slider 5 and extends to the outer wall of the mounting rod 51.

[0030] Specifically, two sliders 5 are slidably mounted on the outer surface of the mounting rod 51. The two sliders 5 are adjusted to a suitable position. By rotating the threaded post 53 inside the slider 5, the threaded post 53 can be made to abut against the outer wall of the mounting rod 51, thereby limiting and fixing the slider 5 to the outside of the mounting rod 51. Each slider 5 is equipped with a placement rack 1. The placement opening 11 inside the placement rack 1 fits the diameter of the burette 3 at different positions. Thus, the bottom placement rack 1 can lock the conical opening of the burette 3, and the top placement rack 1 can lock the outer surface of the burette 3, so that the burette 3 is mounted above the titration table 52. The conical flask is placed on the top of the titration table 52. The liquid outlet at the bottom of the burette 3 can drip the solution into the inside of the conical flask through the through-hole 107 of the adapter plate 105 and the leak plate 108. The stirring rod 4 can be inserted into the inside of the conical flask.

[0031] Working principle: When titrating acid and alkali solutions, pull the two sliders 5 to slide them to the appropriate position on the outer surface of the mounting rod 51. Then rotate the threaded column 53 to press against the outer wall of the mounting rod 51, limiting and fixing the sliders 5 to the outside of the mounting rod 51. This allows the burette 3 to be inserted into the placement port 11 inside the two placement holders 1. Before inserting the burette 3 into the placement port 11, the solution needs to be poured into the burette 3 to seal the top of the burette 3, preventing the solution from flowing out. Place the burette 3 above the titration stand 52, place the conical flask on top of the titration stand 52, and connect the mouth of the conical flask to the bottom of the adapter plate 105. Open the top of the burette 3, and the liquid outlet at the bottom of the burette 3 will start dripping, allowing the solution to flow through the connecting sleeve 10. 6. The solution enters the through-hole 107 and then drips into the conical flask through the leak plate 108. When the acid or alkaline solution in the conical flask is about to reach the titration endpoint, the dripping speed needs to be slowed down. Press down the connecting rod 102 to drive the connecting ring 2 to squeeze the elastic element 103, causing the adapter plate 105 to move down and disengage the docking sleeve 106 from the bottom outlet of the burette 3. Then rotate the adapter plate 105 to change the docking sleeve 106 to connect with the bottom outlet of the burette 3. Release the connecting rod 102, and the elastic element 103 resets, driving the connecting ring 2 and the connecting rod 102 to reset. Thus, the burette 3 can be connected to different docking sleeves 106. By changing the dripping speed of the solution through the leak plate 108 with different leak holes inside the docking sleeve 106, the dripping amount of the solution can be precisely controlled. When the solution in the burette 3 drips into the conical flask, the drive motor 44 is powered on and starts to drive the rotating gear 43 to rotate. In turn, the rotating gear 43 drives the rotating gear 41 and the stirring rod 4 to rotate. The stirring rod 4 is T-shaped, so it can be inserted into the conical flask to stir the acid and alkali solutions, which facilitates solution mixing, color observation, and determination of the titration endpoint.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A laboratory solution acidity and alkalinity precision titration device, comprising a placement rack (1), wherein the placement rack (1) has a placement opening (11) inside, characterized in that: The placement rack (1) has an installation port (101) inside. A connecting rod (102) is slidably installed inside the placement rack (1). The connecting rod (102) is installed inside the installation port (101). An elastic element (103) is sleeved on the outer surface of the connecting rod (102). A limiting plate (104) is fixedly installed through the top of the connecting rod (102) to the top of the placement rack (1). A transition plate (105) is rotatably sleeved through the bottom of the connecting rod (102) to the bottom of the placement rack (1). A docking sleeve (106) is fixedly installed on the top of the transition plate (105). A through hole (107) is opened inside the transition plate (105). A perforated plate (108) is installed at the bottom of the docking sleeve (106). The perforated plate (108) is located inside the through hole (107).

2. The laboratory solution acidity / alkalinity precision titration device according to claim 1, characterized in that: The bottom of the elastic element (103) is fixedly installed on the bottom of the inner wall of the mounting port (101), and a connecting ring (2) is installed on the top of the elastic element (103). A ring groove (21) is opened on the outer surface of the connecting rod (102), and the connecting ring (2) is rotatably installed inside the ring groove (21).

3. The laboratory solution acidity / alkalinity precision titration device according to claim 2, characterized in that: A burette (3) is installed on the top of the docking sleeve (106), and the burette (3) is inserted into the placement port (11).

4. The laboratory solution acidity / alkalinity precision titration device according to claim 3, characterized in that: Multiple through-holes (107) are provided, and the multiple through-holes (107) are arranged in a circular array inside the adapter plate (105).

5. The laboratory solution acidity / alkalinity precision titration device according to claim 1, characterized in that: The top of the placement rack (1) is provided with a slot, and the bottom of the placement rack (1) is provided with a stirring rod (4). The top of the stirring rod (4) extends through the inside of the slot and is provided with a rotating tooth (41). The top of the rotating tooth (41) is rotatably provided with a fixing plate (42), and the fixing plate (42) is fixedly installed on the inner wall of the slot.

6. The laboratory solution acidity / alkalinity precision titration device according to claim 5, characterized in that: The first rotating tooth (41) is engaged with the second rotating tooth (43), which is rotatably installed on the bottom of the inner wall of the slot, and a drive motor (44) is installed on the top of the second rotating tooth (43).

7. The laboratory solution acidity and alkalinity accurate detection titration device according to claim 1, characterized in that: A slider (5) is fixedly installed on the side of the placement rack (1) away from the burette (3). An installation rod (51) is slidably installed inside the slider (5). A titration stage (52) is fixedly installed at the bottom of the installation rod (51).

8. The laboratory solution acidity and alkalinity accurate detection titration device according to claim 7, characterized in that: The slider (5) is threaded with a threaded post (53) on the side away from the placement frame (1). The end of the threaded post (53) near the slider (5) passes through the slider (5) and extends to the outer wall of the mounting rod (51).

Images