Lifting control mechanism for dripping liquid reagent in laboratory, and liquid dripping method

Abstract

A lifting control mechanism for dripping a liquid reagent in a laboratory, and a liquid dripping method. The mechanism comprises a stand (1), wherein a lifting device and a controller (11) are provided on the stand (1); a display screen (12) is provided on the controller (11); the controller (11) is coupled to the lifting device; a suspension structure is provided on the lifting device; and the suspension structure is driven by the lifting device to ascend or descend. The use of the lifting mechanism and the liquid dripping method reduces the contact area between a solvent and an elastic hose (9) prone to swelling, thereby prolonging the service life of the tube (9), improving the experiment safety, and reducing the experiment costs.

Description

Lifting control mechanism and liquid dropping method for laboratory liquid reagent dropping Technical Field

[0001] This invention relates to a lifting control mechanism and a liquid dropping method for adding liquid reagents in a chemical laboratory, belonging to the field of application technology of liquid reagent dropping equipment in chemical laboratories. Background Technology

[0002] In chemical laboratories, the automated addition of liquid chemical reagents is an essential operation. Manual addition is inaccurate, and the addition speed and time are difficult to control precisely. Peristaltic pumps or syringe pumps are typically used to achieve automated addition of liquid reagents. Syringe pumps are similar to syringes, with an electric actuator added after the plunger. The main problem is that the sealing ring of the syringe piston is extremely prone to swelling in organic solvents, making it difficult to push. Furthermore, the strength of the swollen sealing ring is significantly reduced, and friction with the syringe barrel wall causes it to break and fail quickly. Even if the sealing ring is made of fluororubber or a special high-oil-resistant rubber, the problem of swelling by organic solvents cannot be completely avoided. Therefore, peristaltic pumps are more commonly used in chemical laboratories for automated dispensing. However, peristaltic pumps have several drawbacks: 1. Due to the high-frequency compression of the flexible tubing by the rollers, the tubing is prone to breakage, resulting in a short lifespan, especially when dispensing highly corrosive solutions. A broken tubing can cause laboratory accidents and pose a safety hazard. 2. As the tubing wears, corrodes, and swells, its elasticity and inner diameter change, leading to poor dispensing accuracy, typically with an error of 2%. 3. The flow rate range is narrow; different flow rates require different peristaltic pumps with different flow ranges. 4. Multi-channel dispensing requires multiple peristaltic pumps, and consistency across channels is poor. 5. They are cumbersome to use; the mass of the liquid reagent to be dispensed must be converted to volume before dispensing, and the dispensing rate must be pre-calibrated. Frequent calibration is also required during dispensing. 6. They are not suitable for continuous dispensing over long periods; the tubing's lifespan in solvents is only one to two hundred hours. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of peristaltic pumps and provide a lifting control mechanism and liquid dropping method for liquid reagent dropping in chemical laboratories, which has a long service life, high experimental safety, low experimental cost, high dropping accuracy, wide dropping flow range, is suitable for multi-channel dropping, and is convenient to operate.

[0004] The technical solution of the lifting control mechanism for adding liquid reagents in a chemical laboratory according to the present invention is as follows: it includes a support frame, a lifting device and a controller installed on the support frame, a display screen installed on the controller, the controller being connected to the lifting device, and a suspension structure installed on the lifting device, the suspension structure being raised or lowered by the lifting device.

[0005] Furthermore, the lifting device is an electric screw slide, or an electric rack and pinion slide, or a linear motor slide, or an electric synchronous belt slide, or an electric synchronous chain slide, or an electric trapezoidal screw jack, or an electric rack and pinion jack, or an electric winch, or an electric ball screw jack.

[0006] Furthermore, the suspension structure is a hook, a suspension rod, or a suspension rope, or a hook is provided on the suspension rod or suspension rope.

[0007] Furthermore, a liquid storage cylinder is suspended on the suspension structure. The liquid storage cylinder is a straight cylindrical liquid storage cylinder with an inlet at the top, a closed bottom plane, and an outlet at the bottom.

[0008] The present invention relates to a liquid dispensing method for a lifting control mechanism for dispensing liquid reagents in a chemical laboratory: the method includes the following steps:

[0009] Step 1: Lower the hook to the lowest point using the lifting device;

[0010] Step 2: Hang the empty liquid storage cylinder on the hook;

[0011] Step 3: Take the reaction flask and set up a drip port on the feed inlet of the reaction flask. Use a thin tube to connect one end to the outlet at the bottom of the liquid storage cylinder and the other end to the drip port of the reaction flask; ensure that no point in the tube from the outlet to the drip port is higher than the drip port.

[0012] Step 4: Add liquid reagent into the inlet of the liquid storage cylinder, use the lifting device to raise the liquid storage cylinder, and stop the liquid storage cylinder at the position when the liquid is about to drip out of the drip nozzle. At this time, the liquid level in the liquid storage cylinder is level with the drip nozzle. Measure the height of the liquid reagent in the liquid storage cylinder. This height is the height that the liquid storage cylinder needs to be raised.

[0013] Step 5: Enter the liquid reagent height value and the planned dripping time on the controller screen to start the operation;

[0014] Step Six: During operation, the lifting device drives the suspension structure to move, and the suspension structure drives the hook and liquid storage cylinder to rise. When the liquid level in the liquid storage cylinder is higher than the dripping port, gravity causes the liquid reagent to flow from the liquid storage cylinder to the dripping port and drip out from the dripping port. The liquid storage cylinder is continuously lifted, and the liquid reagent continues to drip out from the dripping port.

[0015] Step 7: After the set running time, the liquid storage cylinder will be raised to the height of the liquid input before the start of operation. At this time, the bottom of the liquid storage cylinder will be level with the drip nozzle, and all the liquid reagent in the liquid storage cylinder will have flowed into the reaction flask from the drip nozzle, and the addition will be completed.

[0016] Compared with existing peristaltic pumps, the advantages of this invention are:

[0017] 1. Although it uses a flexible tube to connect the storage container and the reaction flask, similar to a peristaltic pump, the flexible tube of this invention does not experience the high-frequency compression of the rollers in a peristaltic pump or the friction between the piston sealing ring and the cylinder wall in a syringe pump. Even if the flexible tube is corroded or swollen by organic solvents, it is essentially not subjected to stress, so its service life is still very long. If highly corrosion-resistant PTFE flexible tubes are used, and only a small section of elastic flexible tube is used at both ends of the PTFE flexible tube to connect the storage container and the reaction flask, the contact area between the solvent and the easily swollen elastic flexible tube is greatly reduced, thereby increasing the service life of the flexible tube, improving the safety of the experiment, and reducing the experimental cost.

[0018] 2. Precise control of the liquid-holding cylinder's lifting speed is easily achieved, with a dripping speed error of less than 0.2%, meeting the general error requirement of less than 0.5% in chemical laboratories. In contrast, the accuracy of peristaltic pumps is significantly affected by the inner diameter and elasticity of the tubing. During prolonged continuous dripping, the inner diameter and elasticity of the tubing change even more due to wear and swelling, typically resulting in an error of 2%. Therefore, when using a peristaltic pump in the laboratory, the container of the liquid to be dripped is usually placed on a balance, and the actual dripping speed is constantly measured and calculated for adjustment of the peristaltic pump, which is relatively cumbersome.

[0019] 3. By using liquid storage cylinders of different diameters, the dripping flow rate can be varied over a very wide range. With a small-diameter liquid storage cylinder, the dripping flow rate can be as low as one gram every few hours. With a large-diameter liquid storage cylinder, the dripping flow rate can be as high as one kilogram per minute. The flow rate range meets the experimental requirements in most cases. However, if a peristaltic pump is used, several peristaltic pumps with different flow rates and hoses of different diameters need to be configured to achieve the same flow rate range.

[0020] 4. With a total load exceeding ten kilograms, this dropping capacity meets most laboratory needs. Within the total load, multiple liquid storage cylinders can be suspended for multi-channel dropping, with all cylinders being lifted at the same speed, resulting in a completely consistent dropping rate. In contrast, a peristaltic pump would require a multi-channel pump, and the consistency of the tubing would determine the difference in dropping rate. Alternatively, the outlets of multiple suspended liquid storage cylinders can be connected in series with a T-junction to a single reaction flask to achieve large-capacity dropping.

[0021] 5. Simply measure the liquid level of the reagent to be added on the measuring cylinder, input the height value and the planned dripping time into the controller, and the setting is complete. It is simple and quick. In contrast, the peristaltic pump is a volumetric pump. The mass of the liquid reagent must be converted into volume, or the density must be measured to calculate the volume, or the volume must be measured before the peristaltic pump can be set, which is relatively cumbersome.

[0022] 6. By controlling the motor speed, ultra-slow dripping can be easily achieved, such as continuously dripping liquid reagents for hundreds or even thousands of hours. This is something that peristaltic pumps and syringe pumps cannot achieve, and their hoses or sealing rings have a lifespan of no more than one or two hundred hours in organic solvents. Attached Figure Description

[0023] Figure 1 is a perspective view of Embodiment 1 of the present invention;

[0024] Figure 2 is a perspective view of Embodiment 2 of the present invention;

[0025] Figure 3 is a perspective view of Embodiment 3 of the present invention;

[0026] Figure 4 is a perspective view of Embodiment 4 of the present invention;

[0027] Figure 5 is a perspective view of Embodiment 5 of the present invention;

[0028] Figure 6 is a perspective view of Embodiment 6 of the present invention;

[0029] Figure 7 is a perspective view of Embodiment 7 of the present invention;

[0030] Figure 8 is a perspective view of Embodiment 8 of the present invention;

[0031] Figure 9 is a perspective view of Embodiment 9 of the present invention;

[0032] Figure 10 is a perspective view of Embodiment 10 of the present invention.

[0033] The diagram is labeled as follows: 1—Support frame; 2—Motor; 3—Slide table; 4—Suspension rod; 5—Hanging rope; 6—Hook; 7—Liquid storage cylinder; 71—Inlet; 8—Outlet; 9—Thin hose; 10—Drip outlet; 11—Controller; 12—Display screen; 100—Reaction flask; 101—Inlet; 21—Electric screw slide table; 22—Electric rack and pinion slide table; 23—Linear motor slide table; 24—Electric synchronous belt slide table; 25—Electric synchronous chain slide table; 26—Electric trapezoidal screw jack; 27—Electric rack and pinion jack; 28—Electric winch; 29—Electric screw jack; 31—Screw; 32—Winding reel. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0035] The technical solution of the lifting control mechanism for adding liquid reagents in a chemical laboratory according to the present invention is as follows: it includes a support frame 1, a lifting device and a controller 11 provided on the support frame 1, a display screen 12 provided on the controller 11, the controller 11 is connected to the lifting device, and a suspension structure is provided on the lifting device, which is driven to rise or fall by the lifting device.

[0036] Furthermore, the lifting device is an electric screw slide 21, or an electric rack and pinion slide 22, or a linear motor slide 23, or an electric synchronous belt slide 24, or an electric synchronous chain slide 25, or an electric trapezoidal screw jack 26, or an electric rack and pinion jack 27, or an electric winch 28, or an electric ball screw jack 29.

[0037] Furthermore, the suspension structure is a hook 6, a suspension rod 4, or a suspension rope 5, or a hook 6 is provided on the suspension rod 4 or the suspension rope 5.

[0038] Furthermore, the liquid storage cylinder 7 is suspended on the suspension structure. The liquid storage cylinder 7 is a straight cylindrical liquid storage cylinder. The upper part of the liquid storage cylinder 7 is provided with a feed port 71. The bottom plane of the liquid storage cylinder 7 is closed. The bottom of the liquid storage cylinder 7 is provided with a liquid outlet 8. Example 1

[0039] This invention relates to a lifting control mechanism for adding laboratory liquid reagents, as shown in Figure 1. It includes a support frame 1, on which an electric lead screw slide 21 (the specific structure of the electric lead screw slide 21 is existing technology) and a controller 11 are mounted. The controller 11 is connected to a motor 2 of the electric lead screw slide 21, and a display screen 12 is mounted on the controller 11. The slide 3 of the electric lead screw slide 21 is connected to a suspension rod 4, and a hook 6 is mounted on the suspension rod 4. A liquid storage cylinder 7 is suspended from the hook 6. The liquid storage cylinder 7 is a straight cylindrical liquid storage cylinder with an inlet 71 at the top, a closed bottom plane, and a liquid outlet 8 at the bottom.

[0040] During operation, the output shaft of motor 2 drives the lead screw 31 to rotate. The lead screw 31 engages with the threaded lead screw nut, causing the lead screw nut to rise and fall. The lead screw nut then causes the slide table 3 to rise and fall, which in turn causes the suspension rod 4 to rise and fall. The suspension rod 4 then causes the hook 6 and the suspended liquid storage cylinder 7 to rise and fall. The advantages of this structure are: 1. It occupies a small area on the experimental platform; 2. It can suspend multiple liquid storage cylinders 7 and connect multiple reaction flasks 100 for multiple parallel experiments; 3. Multiple liquid storage cylinders 7 with outlets 8 can be connected in series with a three-way pipe to a single reaction flask 100 for large-capacity dripping in a single experiment; 4. The lead screw 31 amplifies the torque of motor 2 by a large factor, giving the device a high load capacity; 5. The motor 2 of the lead screw slide table 21 uses a stepper motor or servo motor, which has high precision, high torque, and is suitable for low-speed operation. Example 2

[0041] As shown in Figure 2, the basic content is the same as in Embodiment 1, except that the motor 2 of the electric lead screw slide 21, which indirectly drives the lead screw 31 to rotate and drive the lead screw nut and slide 3 to move, is changed to the motor 2 directly driving the lead screw nut to rotate and drive the slide 3 to move. The slide 3 drives the suspension rod 4, hook 6 and liquid storage cylinder 7 to rise and fall. Example 3

[0042] As shown in Figure 3, the basic content is the same as in Embodiment 2, except that the gear transmission that drives the screw nut to rotate in the electric screw slide 21 is changed to a worm gear transmission. The worm on the motor 2 drives the worm wheel to rotate, and the worm drives the screw nut to rotate, which in turn drives the slide 3, the suspension arm 4, the hook 6 and the liquid storage cylinder 7 to rise and fall. This device has a greater load capacity due to the torque amplification effect of the worm gear. Example 4

[0043] As shown in Figure 4, the basic content is the same as in Embodiment 1, except that the lead screw slide 21 is replaced by an electric gear rack slide 22 (the specific structure of the electric gear rack slide 22 is existing technology), and the electric gear rack slide 22 drives the slide 3, suspension rod 4, hook 6 and liquid storage cylinder 7 to rise and fall. Example 5

[0044] As shown in Figure 5, the basic content is the same as in Embodiment 1, except that the lead screw slide 21 is replaced by a linear motor slide 23 (the specific structure of the linear motor slide 23 is existing technology), and the linear motor slide 23 drives the slide 3, suspension rod 4, hook 6 and liquid storage cylinder 7 to rise and fall. Example 6

[0045] As shown in Figure 6, the basic content is the same as in Embodiment 1, except that the lead screw slide 21 is replaced by an electric synchronous belt slide 24 (the specific structure of the electric synchronous belt slide 24 is existing technology), and the electric synchronous belt slide 24 drives the slide 3, suspension rod 4, hook 6 and liquid storage cylinder 7 to rise and fall. Example 7

[0046] As shown in Figure 7, the basic content is the same as in Embodiment 6, except that the electric synchronous belt slide 24 is replaced by an electric synchronous chain slide 25 (the specific structure of the electric synchronous chain slide 25 is existing technology), and the electric synchronous chain slide 25 drives the slide 3, suspension rod 4, hook 6 and liquid storage cylinder 7 to rise and fall. Example 8

[0047] As shown in Figure 8, the basic content is the same as in Embodiment 1, except that the lead screw slide 21 is replaced by an electric gear and rack lift 27 (the specific structure of the electric gear and rack lift 27 is existing technology). A hook 6 is set at the lower end of the rack of the electric gear and rack lift 27, and the hook 6 and the liquid storage cylinder 7 are lifted and lowered by the electric gear and rack lift 27. Example 9

[0048] As shown in Figure 9, the basic content is the same as in Embodiment 8, except that the electric gear and rack lift 27 is replaced by an electric screw lift 26 (the specific structure of the electric screw lift 26 is existing technology), and the electric screw lift 26 drives the hook 6 and the liquid storage cylinder 7 to lift. Example 10

[0049] As shown in Figure 10, the basic content is the same as in Embodiment 9, except that the electric screw jack 26 is replaced by an electric winch 28 (the specific structure of the electric winch 28 is existing technology). The end of the rope 5 of the winding wheel 32 of the electric winch 28 is equipped with a hook 6, and the electric winch 28 drives the hook 6 and the liquid storage cylinder 7 to rise and fall.

[0050] The present invention relates to a liquid dispensing method for a lifting control mechanism for dispensing laboratory liquid reagents, comprising the following steps:

[0051] Step 1: Lower hook 6 to its lowest point using the lifting device;

[0052] Step 2: Hang the empty liquid storage cylinder 7 on the hook 6;

[0053] Step 3: Take reaction flask 100 and set a drip port 10 on the feed port 101 of reaction flask 100. Use a thin flexible tube 9 to connect one end to the outlet 8 at the bottom of the liquid storage cylinder 7 and the other end to the drip port 10 of reaction flask 100; ensure that no point in the pipeline from the outlet 8 to the drip port 10 is higher than the drip port 10.

[0054] Step 4: Add liquid reagent through the inlet 71 of the liquid storage cylinder 7, raise the liquid storage cylinder 7, and stop the liquid storage cylinder at the position when the liquid is about to drip from the drip nozzle 10. At this time, the liquid level in the liquid storage cylinder 7 is level with the drip nozzle 10. Measure the height of the liquid reagent in the liquid storage cylinder 7. This height is the height that the liquid storage cylinder 7 needs to be raised.

[0055] Step 5: Input the liquid reagent height value and the planned dripping time on the screen 12 of the controller 11 to start the operation;

[0056] Step 6: During operation, the lifting device drives the suspension structure to move, and the suspension structure drives the hook 6 and the liquid storage cylinder 7 to rise. When the liquid level in the liquid storage cylinder 7 is higher than the dripping port 10, gravity causes the liquid reagent to flow from the liquid storage cylinder 7 to the dripping port 10 and drip out from the dripping port 10. The liquid storage cylinder 7 is continuously lifted, and the liquid reagent continues to drip out from the dripping port 10.

[0057] Step 7: After the set running time, the liquid storage cylinder 7 will be raised to the height of the liquid input before the start of operation. At this time, the bottom of the liquid storage cylinder 7 will be level with the drip port 10. All the liquid reagent in the liquid storage cylinder has flowed into the reaction bottle 100 from the drip port 10, and the addition is complete.

[0058] The beneficial effects of this invention are:

[0059] 1. Although it uses a flexible tube to connect the storage container and the reaction flask, similar to a peristaltic pump, the flexible tube of this invention does not experience the high-frequency compression of the rollers in a peristaltic pump or the friction between the piston sealing ring and the cylinder wall in a syringe pump. Even if the flexible tube is corroded or swollen by organic solvents, it is essentially not subjected to stress, so its service life is still very long. If highly corrosion-resistant PTFE flexible tubes are used, and only a small section of elastic flexible tube is used at both ends of the PTFE flexible tube to connect the storage container and the reaction flask, the contact area between the solvent and the easily swollen elastic flexible tube is greatly reduced, thereby increasing the service life of the flexible tube, improving the safety of the experiment, and reducing the experimental cost.

[0060] 2. The liquid storage cylinder 7 is raised by a lifting device, which can easily achieve precise control of the lifting speed with an error of less than 0.2%, meeting the general error requirement of less than 0.5% in chemical laboratories; while the accuracy of peristaltic pumps is greatly affected by the inner diameter and elasticity of the hose. The inner diameter and elasticity of the hose change with wear and swelling, especially during long-term continuous operation, these changes are more obvious, making it impossible to maintain a constant flow rate. Generally speaking, the error is 2%.

[0061] 3. The liquid storage cylinder 7 is directly hung on the hook 6, making it easy to replace. By using liquid storage cylinders 7 of different diameters, the dripping flow rate can be varied over a very wide range. When using a small-diameter liquid storage cylinder 7, the dripping flow rate can be as low as a few grams per hundred hours. When using a large-diameter liquid storage cylinder 7, the dripping flow rate can be as high as several kilograms per minute. This flow rate range meets the experimental requirements in most cases. In contrast, if a peristaltic pump is used, several peristaltic pumps with different flow rates and hoses of different diameters need to be configured to achieve the same flow rate range.

[0062] 4. With a total load exceeding ten kilograms, this dropping capacity meets most laboratory needs. Within the total load, multiple liquid storage cylinders can be suspended for multi-channel dropping. The cylinders are lifted at the same speed, resulting in a completely consistent dropping rate. In contrast, a peristaltic pump would need to be replaced with a multi-channel pump, as the consistency of the tubing determines the difference in dropping rate. Alternatively, the outlets of multiple suspended liquid storage cylinders can be connected in series via T-joints to a single reaction flask to achieve large-capacity dropping.

[0063] 5. Simply measure the liquid level of the reagent to be added on the measuring cylinder 7, input the height value and the planned dripping time on the display screen 12 on the controller 11, and the setting is completed. It is simple and quick. In contrast, the peristaltic pump is a volumetric pump. The mass of the liquid reagent needs to be converted into volume, or the density needs to be measured to calculate the volume, or the volume needs to be measured directly before the peristaltic pump can be set. It is relatively cumbersome.

[0064] 6. By controlling the motor speed, ultra-slow dripping can be easily achieved, such as continuously dripping liquid reagents for hundreds or even thousands of hours, which is something that peristaltic pumps cannot achieve, and their hoses have a lifespan of no more than one or two hundred hours in organic solvents.

Claims

1. A lifting control mechanism for adding liquid reagents in a laboratory, characterized in that, It includes a support frame (1), a lifting device and a controller (11) provided on the support frame (1), a display screen (12) provided on the controller (11), the controller (11) is connected to the lifting device, and a suspension structure is provided on the lifting device, which is driven to rise or fall by the lifting device.

2. The lifting control mechanism for adding laboratory liquid reagents as described in claim 1, characterized in that, The lifting device is an electric screw slide (21), or an electric rack and pinion slide (22), or a linear motor slide (23), or an electric synchronous belt slide (24), or an electric synchronous chain slide (25), or an electric trapezoidal screw jack (26), or an electric rack and pinion jack (27), or an electric winch (28), or an electric ball screw jack (29).

3. The lifting control mechanism for adding laboratory liquid reagents as described in claim 1, characterized in that, The suspension structure is a hook (6), a suspension rod (4), or a suspension rope (5), or a hook (6) is provided on the suspension rod (4) or the suspension rope (5).

4. The lifting control mechanism for adding laboratory liquid reagents as described in claim 1, characterized in that, The suspension structure is used to suspend a liquid storage cylinder (7). The liquid storage cylinder (7) is a straight cylindrical liquid storage cylinder. The upper part of the liquid storage cylinder (7) is provided with a feed inlet (71). The bottom plane of the liquid storage cylinder (7) is closed. The bottom of the liquid storage cylinder (7) is provided with a liquid outlet (8).

5. A liquid dispensing method using a lifting control mechanism for dispensing laboratory liquid reagents, the method employing the lifting control mechanism for dispensing laboratory liquid reagents as described in any one of claims 1-4, characterized in that... The method includes the following steps: Step 1: Lower the hook (6) to the lowest point using the lifting device; Step 2: Hang the empty liquid storage cylinder (7) on the hook (6); Step 3: Take the reaction flask (100) and set a drip port (10) on the feed port (101) of the reaction flask (100). Use a thin flexible tube (9) to connect one end to the outlet (8) at the bottom of the liquid storage cylinder (7) and the other end to the drip port (10) of the reaction flask (100); ensure that no point in the pipeline from the outlet (8) to the drip port (10) is higher than the drip port (10). Step 4: Add liquid reagent through the feed port (71) of the liquid storage cylinder (7), and use the lifting device to lift the liquid storage cylinder (7). When the liquid is about to drip from the drip port (10), the liquid storage cylinder stops at this position. At this time, the liquid level in the liquid storage cylinder (7) is level with the drip port (10). Measure the height of the liquid reagent in the liquid storage cylinder (7). This height is the height that the liquid storage cylinder (7) needs to be lifted. Step 5: Input the liquid reagent height value and the planned dripping time on the screen (12) of the controller (11) to start the operation; Step 6: During operation, the lifting device drives the suspension structure to move, and the suspension structure drives the hook (6) and the liquid storage cylinder (7) to rise. When the liquid level in the liquid storage cylinder (7) is higher than the dripping port (10), gravity causes the liquid reagent to flow from the liquid storage cylinder (7) to the dripping port (10) and drip out from the dripping port (10). The liquid storage cylinder (7) is continuously lifted, and the liquid reagent continues to drip out from the dripping port (10). Step 7: After running for a set time, the height of the liquid storage cylinder (7) is the liquid height input before starting the operation. At this time, the bottom of the liquid storage cylinder (7) is level with the drip port (10). All the liquid reagent in the liquid storage cylinder has flowed into the reaction bottle (100) from the drip port (10), and the addition is completed.

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