A pretreatment device for silicate determination

Abstract

The utility model discloses a kind of pretreatment devices of silicate determination, it is related to silicate detection technical field, including control system, mixing device and liquid quantitative device. Mixing device is rotated by carousel motor drive carousel, cooperate with the switching of coupler positioning and titration container in liquid-adding mixing station and stationary station, magnetic stirrer replaces artificial shake, covers motor drive polytetrafluoroethylene cover in stationary time sealing container;Liquid quantitative device contains five sets of independent units, by five-way injection pump, quantitative liquid pipe and coupler cooperate accurate control reagent addition amount, air pump blow wash pipeline residue ensures accurate quantification. The device can automatically complete the reagent addition of silicate determination pretreatment, mixing, stationary whole process, solve the problem that manual operation error is big, efficiency is low, consistency is poor, improve detection accuracy and standardization, applicable to large-scale batch detection scene.

Description

Technical Field

[0001] This utility model relates to the field of silicate detection technology, specifically to a pretreatment device for silicate determination. Background Technology

[0002] In silicate determination, pretreatment is a crucial step affecting the accuracy of the results. A fixed procedure must be followed: take 10 ml of sample solution, add 4.5 ml of 5% sulfuric acid solution and 2 ml of ammonium molybdate solution sequentially, and let stand for 20 minutes; then add 5 ml of oxalic acid solution and let stand for 5 minutes; finally, add 0.2 ml of stannous chloride hydrochloric acid solution, dilute to 25 ml, shake well, and let stand for 5 minutes. Currently, this pretreatment process mainly relies on manual operation, but manual operation has many shortcomings: first, the amount of reagent added depends on manual measurement, which is prone to inaccurate reagent volume due to operational errors, affecting the reaction process; second, the inconsistent shaking force and method may lead to uneven mixing of the solution, affecting the sufficiency of the reaction; third, when processing samples in batches, manual operation is inefficient and it is difficult to ensure the consistency of processing conditions for each sample, which is not conducive to large-scale detection. Therefore, to solve the problems of large errors, low efficiency, and poor consistency in manual operation, designing a device that can automate the above pretreatment process has become an important requirement for improving the accuracy and efficiency of silicate determination. Summary of the Invention

[0003] This invention addresses the aforementioned shortcomings of existing technologies by providing a pretreatment device for silicate determination, comprising: a control system, a mixing device, and a liquid metering device. The mixing device includes: a mixer body, a turntable motor, a turntable motor extension shaft, a turntable optical coupler, an optical coupler trigger rod, a capping motor, a turntable motor driver, a capping motor driver, a magnetic stirrer, and a polytetrafluoroethylene cap. The liquid metering device comprises five independent liquid metering units, a mounting frame, a five-way syringe pump, an air pump tube, and an air pump. The five independent liquid metering units correspond to five reagents (sulfuric acid solution, ammonium molybdate solution, oxalic acid solution, stannous chloride hydrochloric acid solution, and purified water). Each liquid metering unit includes: a three-way valve, a reagent bottle, a metering optical coupler, an optical coupler box, a suction tube, an infusion tube, and a metering liquid tube.

[0004] The turntable motor is fixedly connected to the turntable via an extended shaft. Multiple limiting grooves are evenly distributed along the circumference of the turntable. The size of the limiting grooves matches the titration container and is used to stably place the titration container that carries the sample.

[0005] Both the turntable motor driver and the turntable motor are installed at the bottom of the mixer body. The turntable motor driver controls the rotation angle and speed of the turntable motor through electrical signals, thereby driving the turntable to rotate precisely and realize the switching of the titration container between the liquid addition and mixing station and the settling station.

[0006] The turntable optocoupler is fixedly installed on the main body of the mixer and located below the turntable. The optocoupler trigger rod is vertically installed on the extended shaft of the turntable motor and rotates synchronously with the extended shaft. When the turntable rotates, the optocoupler trigger rod passes through the sensing area of ​​the turntable optocoupler and triggers a pulse signal. The control system determines the position of the turntable by recognizing the signal, ensuring that the titration container accurately stops at the target position.

[0007] The capping motor is a through-type servo motor, with its body fixed to the top of the mixer body. The motor's lead screw passes vertically downward through the motor body, and the end of the lead screw is detachably connected to the polytetrafluoroethylene cap. The capping motor driver is installed at the bottom of the mixer body and is electrically connected to the capping motor. By controlling the movement of the lead screw, the polytetrafluoroethylene cap moves up and down, covering the container opening when the titration container enters the settling position to prevent solution evaporation or external impurities from falling in. After settling, the cap automatically rises and detaches from the container.

[0008] The magnetic stirrer is fixedly installed at the bottom of the mixer body at the position corresponding to the mixing station, and its stirring area is aligned with the bottom of the titration container. When the titration container is moved to the liquid addition and mixing station, the magnetic stirrer is activated, and the stir bar inside the container is driven to rotate by the magnetic field to achieve uniform mixing of the solution, replacing manual shaking and ensuring that the mixing force and time are consistent each time.

[0009] Each of the five independent liquid metering units is used to individually hold the corresponding reagent (sulfuric acid solution, ammonium molybdate solution, oxalic acid solution, stannous chloride hydrochloric acid solution, or purified water). One end of the suction tube is inserted into the bottom of the reagent bottle, and the other end is connected to end A of the three-way valve. End B of the three-way valve is connected to one end of the infusion tube. The other end of the infusion tube passes through and is fixed to the elbow on the polytetrafluoroethylene cap. End C of the three-way valve is connected to one end of the metering tube. The other end of the metering tube passes through the metering photocoupler installed in the photocoupler box (the photocoupler box is an opaque closed structure that can prevent external light from interfering with the metering photocoupler) and is then connected to the corresponding port of the five-way syringe pump.

[0010] The metering tube uses a transparent tube with a uniform inner diameter, and the cross-sectional area of ​​its internal cavity is fixed. Based on the principle that "volume = cross-sectional area × height," the volume of liquid inside the tube is strictly proportional to the liquid level. For example, for a 4.5 ml dose of sulfuric acid solution, the metering tube is designed so that when the liquid level rises to a specific height, the corresponding volume of liquid inside the tube is exactly 4.5 ml.

[0011] The quantitative optical coupler is installed inside the optical coupler box and aligned with the aforementioned specific height. It detects the liquid level by emitting and receiving light. When liquid is drawn into the quantitative liquid tube and the liquid level rises to the sensing area of ​​the quantitative optical coupler, the refraction and reflection of light by the liquid will change the signal output of the optical coupler, thereby triggering the control system to recognize that "the preset volume has been reached".

[0012] The five-way syringe pump has five ports A, B, C, D, and E, which are respectively connected to the metering tubing of sulfuric acid solution, ammonium molybdate solution, oxalic acid solution, stannous chloride hydrochloric acid solution, and purified water in five sets of liquid metering units. The five-way syringe pump also has an additional air pump port, which is connected to the air pump port via an air pipe. When a reagent needs to be added, the control system controls the three-way valve of the corresponding liquid metering unit to switch to connection between port A and port C. Simultaneously, the five-way syringe pump opens the corresponding port and performs a pull-down action, drawing liquid from the reagent bottle into the metering tubing through the suction tube. When the liquid level rises to the sensing window of the metering photocoupler, the metering photocoupler sends a signal to the control system. The system immediately controls the three-way valve to switch to connection between port B and port C. At the same time, the five-way syringe pump performs a push-back action, pushing the preset volume of reagent in the metering tubing along the infusion tube into the titration container. After the push is completed, the control system turns on the air pump and controls the five-way syringe pump to switch to connection between the air pump port and the metering tubing, using air pressure to blow the small amount of liquid remaining in the tubing into the titration container, ensuring accurate reagent addition.

[0013] The mounting bracket is used to install or support the air pump, reagent bottles, five-way syringe pump, and five sets of liquid dispensing units.

[0014] Compared with the prior art, this utility model has the following advantages:

[0015] Improved operational accuracy: The use of liquid metering devices precisely controls the amount of reagent added, replacing manual measurement and reducing inaccurate reagent volume due to operational errors, thus ensuring the stability of the reaction process; Magnetic stirrers replace manual shaking, ensuring uniform mixing force and time, guaranteeing solution homogeneity, ensuring sufficient reaction, and reducing differences caused by different manual operation methods; The automated process strictly follows the preset program, and when processing samples in batches, the reagent addition, mixing, and settling conditions of each sample are completely consistent, improving the reliability and comparability of the test data.

[0016] Improve work efficiency: The system automates a series of pre-processing operations, eliminating the need for manual processing of each sample. This significantly saves time and labor costs, and speeds up the testing process, especially in batch testing scenarios.

[0017] Enhanced operational standardization and safety: The control system automatically executes operations according to a fixed process, avoiding omissions or errors in the sequence that may occur during manual operation, thus ensuring the standardization of pretreatment; The motor-driven polytetrafluoroethylene cap is used to cover the titration container during standing, preventing solution evaporation and loss or contamination, while also preventing external impurities from entering, thereby improving operational safety. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0020] Figure 2 This is a schematic diagram of the liquid mixing device according to an embodiment of the present invention.

[0021] Figure 3 This is a cross-sectional view of a liquid mixing device according to an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the structure of a single liquid metering unit, a five-way injection pump, an air pump tube, and an air pump room in an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the position structure of the quantitative liquid tube and the quantitative optical coupler in an embodiment of this utility model.

[0024] Among them, 1. Control system, 2. Mixing device, 201. Mixer body, 202. Covering motor, 203. Covering motor servo driver, 204. PTFE cover, 205. Turntable motor, 206. Turntable motor servo driver, 207. Magnetic stirrer, 208. Turntable motor extended shaft, 209. Turntable optocoupler, 210. Turntable optocoupler trigger rod, 211. Turntable, 3. Liquid metering device, 301. Five-way syringe pump, 302. Air pump tube, 303. Air pump, 304. Liquid extraction tube, 305. Quantitative liquid tube, 306. Infusion tube, 307. Three-way valve, 308. Reagent bottle, 309. Quantitative optocoupler, 310. Optical coupler box, 311. Mounting bracket. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. The present invention is not limited to the specific embodiments disclosed below.

[0026] Before starting the device, the testing personnel prepare four clean and dry polytetrafluoroethylene beakers, place them in the limiting grooves on the turntable 211, and add 10 ml of sample solution to each beaker. Then, the device is started, and the pretreatment process is executed automatically. The control system 1 sends a command to the turntable motor driver 206, driving the turntable motor 205 to rotate, which in turn drives the turntable 11 to rotate via the extended shaft 208. When the optocoupler trigger rod 210 rotates with the extended shaft to the position of the turntable optocoupler 209, a positioning signal is triggered, and the turntable 11 stops precisely at the liquid addition and stirring position. At this time, beaker number one is directly above the magnetic stirrer 207 and directly below the infusion tube 306.

[0027] Control system 1 controls the three-way valve 307 corresponding to the sulfuric acid solution to switch to connection between end A and end C, simultaneously opening the corresponding port of the five-way syringe pump 301 and executing a pull-down action, drawing sulfuric acid solution from the sulfuric acid reagent bottle 308 through the sulfuric acid extraction tube 304 to the sulfuric acid quantitative liquid tube 305. When the liquid level rises to the sensing area of ​​the quantitative photocoupler 309 (corresponding to a volume of 4.5 ml), the quantitative photocoupler 309 sends a signal to control system 1. The system immediately controls the three-way valve 307 to switch to connection between end B and end C, and the five-way syringe pump 301 executes a push-back action, injecting 4.5 ml of sulfuric acid solution into beaker number one along the infusion tube 306. After the push is completed, the air pump 303 starts, and simultaneously opens the air pump port of the five-way syringe pump 301, pressurizing the pipeline and blowing the remaining liquid into beaker number one to ensure accurate addition. Repeating the above quantitative addition process, control system 1 drives the liquid quantitative unit of ammonium molybdate to inject 2 ml of ammonium molybdate solution into beaker number one. Subsequently, the control system manipulates the turntable motor driver 206 to drive the turntable motor 205 to rotate at a preset angle (90 degrees), precisely moving beaker No. 2 on the turntable 211 to the liquid addition and stirring station. The above quantitative addition process is repeated, with the control system 1 sequentially driving the liquid metering units for sulfuric acid and ammonium molybdate to inject 4.5 ml of sulfuric acid solution and 2 ml of ammonium molybdate solution into beaker No. 2. Beakers No. 3 and No. 4 are processed sequentially using the same logic. After the liquid addition is complete, the capping motor driver 203 drives the capping motor 202 to lower the PTFE cap 204, tightly sealing each beaker and preventing impurities from entering during settling. The control system 1 times the timer for 20 minutes, during which the turntable 211 remains stationary. After settling, the PTFE cap 204 rises, and the turntable motor 205 drives the turntable 211 to rotate, moving beaker No. 1 back to the liquid addition and stirring station.

[0028] Repeating the above quantitative addition and transfer positioning process, control system 1 drives the liquid metering unit of oxalic acid to sequentially inject 5 ml of oxalic acid solution into beakers No. 1, No. 2, No. 3, and No. 4. After addition, the PTFE cap 204 is lowered again by the capping motor 202 to tightly cover each beaker; after standing for 5 minutes, the PTFE cap 204 is raised, and the turntable motor 205 drives the turntable 211 to rotate, transferring beaker No. 1 back to the liquid addition and stirring station. Repeating the above quantitative addition and transfer positioning process, control system 1 drives the liquid metering units of stannous chloride hydrochloric acid and purified water to sequentially inject 0.2 ml of stannous chloride hydrochloric acid solution and 3.3 ml of purified water into beakers No. 1, No. 2, No. 3, and No. 4. Subsequently, the turntable motor 205 drives the turntable 11 to rotate, transferring beakers No. 1, No. 2, No. 3, and No. 4 to the liquid addition and stirring station. The solution is mixed using a magnetic stirrer 207 at a preset speed and time, replacing manual shaking. After mixing, the magnetic stirrer 207 is stopped, the polytetrafluoroethylene cap 204 is tightened again, and the mixture is left to stand for 5 minutes. After standing, the control system drives all devices to reset, completing the pretreatment for silicate determination.

Claims

1. A pretreatment apparatus for silicate determination, characterized in that, The system includes a control system, a mixing device, and a liquid metering device. The liquid metering device and the mixing device are electrically connected to the control system, which coordinates both to complete the pretreatment operation for silicate determination. The liquid metering device comprises five independent liquid metering units, a five-way syringe pump, an air pump tube, and an air pump. Each liquid metering unit includes a reagent bottle, a three-way valve, a metering liquid tube, an optical coupler box, a metering optical coupler, a suction tube, and an infusion tube. One end of the suction tube is connected to the reagent bottle, and the other end is connected to end A of the three-way valve. End B of the three-way valve is connected to the infusion tube, and end C is connected to the metering liquid tube. The other end of the metering liquid tube is connected to the corresponding port of the five-way syringe pump. The air pump is connected to the air pump port of the five-way syringe pump through the air pump tube. The independent liquid metering units enable the separate extraction and injection of different reagents, avoiding cross-contamination.

2. The apparatus according to claim 1, characterized in that, The quantitative liquid tube is a transparent tube with a uniform inner diameter, and the quantitative photocoupler is set to a preset volume height corresponding to the quantitative liquid tube. When liquid is drawn into the quantitative liquid tube and the liquid level reaches the sensing area of ​​the quantitative photocoupler, the control system controls the three-way valve to switch the path and pushes the preset volume of reagent into the titration container through the five-way injection pump to achieve accurate quantitative measurement of the reagent.

3. The apparatus according to claim 2, characterized in that, After the reagent is dispensed, the control system starts the air pump and simultaneously switches the five-way syringe pump to the air pump port to connect with the quantitative liquid tube. The air pressure is used to blow the residual liquid in the tube into the titration container to ensure that there is no reagent residue.

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