An automatic acid chasing device

Abstract

This invention relates to an automatic acid-removing device. A lead screw is vertically fixed at the center of the bottom of a heating chamber. The lead screw includes two sections of threads with opposite directions of rotation. Each section of the thread is threadedly engaged with a threaded feed assembly. The threaded feed assembly includes an internally threaded core that directly engages with the lead screw, and an external rotating body that is coaxially and elastically sleeved with the internally threaded core via a preload spring. The preload spring allows the internally threaded core and the external rotating body to rotate uniformly relative to the lead screw under a set torque. The external rotating bodies of the two threaded feed assemblies are used to fix several plugs and test tubes in a ring array, with each plug and test tube coaxially corresponding. After the plug is inserted into position, the external rotating body rotates relative to the internally threaded core. The vent hole of the plug is fixedly connected to a secondary gas collecting pipe through a corresponding vent pipe. The main gas collecting pipe is also axially and slidably sealed to the top of the heating chamber. This invention can achieve uniform heating and batch acid removal during the acid-removing operation.

Description

Technical Field

[0001] This invention relates to the field of acid removal equipment technology, and specifically to an automatic acid removal device. Background Technology

[0002] The most commonly used acid removal equipment is the graphite acid removal instrument. Utilizing the rapid and uniform thermal conductivity of graphite, it can reach the target acid removal temperature in a short time, resulting in high heat utilization and lower energy consumption. In contrast, air-heated acid removal has low heating efficiency and poor temperature uniformity, easily leading to individual variations: temperature gradients exist in different locations inside the equipment (such as near the door, the center of the chamber, and corners) (typically ±5℃, but some older equipment can reach ±8℃). This results in inconsistent heating intensity for different samples within the same batch, potentially leading to incomplete acid removal in some samples and over-concentration in others, affecting experimental repeatability.

[0003] However, graphite heating has limited batch processing capacity and is cumbersome to operate: the heating platform needs to be designed according to the sample container size (such as adapting to specific digestion vessels and beakers), each sample needs to be precisely placed at the corresponding heating point, and each point has a corresponding diameter mounting slot to install test tubes or beakers of the corresponding size, etc. The key to graphite heating is whether the test tubes or beakers can be installed according to the most accurate installation size; otherwise, it will seriously affect the heating performance and make it difficult to control the heating situation. Because specific mounting slots and corresponding containers need to be strictly matched, the number of samples processed at one time is usually much smaller than that of air heating equipment. Therefore, when changing the sample container size, it may be necessary to change the appropriate heating module, resulting in insufficient operational flexibility. In addition, because of its rapid heating rate, the local temperature of the sample is prone to sudden rise. If the sample contains organic matter or high concentration of acid, it is easy to cause boiling and splashing, resulting in sample loss and platform contamination. Strict control of the heating rate and sample volume is required, making the operation more demanding and more suitable for applications involving efficient acid removal and high-boiling-point acid treatment. However, while air heating is not highly efficient, it is suitable for processing low-boiling-point acids. It is safe to use, less prone to sudden boiling, and offers ample space without requiring strict installation specifications. It also boasts strong batch processing capabilities and is easy to operate. Specifically, because air-heated equipment has sufficient internal space (such as a drying chamber or heating chamber), it can simultaneously hold multiple sets of samples (dozens of digestion vessels or beakers), making it suitable for large-scale acid removal and significantly improving pretreatment efficiency. Furthermore, it offers high sample safety, reducing the risk of boiling and splashing: hot air provides gentle heat transfer, resulting in a relatively gradual temperature rise. Compared to graphite-based acid removal equipment, this reduces the risk of boiling and splashing caused by sudden localized temperature increases, minimizing sample loss and cross-contamination risks.

[0004] In addition, air-heated acid removal equipment has low maintenance costs and a long service life: the heating elements (such as heating wires and infrared tubes) do not have direct contact with the sample, and heating is done in the air, so it is not easily damaged by sample corrosion (such as acid mist erosion). Daily maintenance only requires cleaning the cavity and ventilation system, without the need to frequently replace the heating platform or repair corrosion marks, resulting in lower long-term use costs.

[0005] It is evident that although graphite has excellent heating performance, it also has the aforementioned limitations. Therefore, in the case of large-volume, low-boiling-point acid, it is still necessary to use air heating for acid removal. However, how to overcome the problem of poor temperature uniformity and the resulting differences in acid removal among samples from the same batch when using air heating has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide an automatic acid removal device to solve the problem that the existing acid removal devices cannot simultaneously achieve heating uniformity and batch processing, and is especially suitable for acid removal of low boiling point acids.

[0007] This invention is achieved through the following technical solution: An automatic acid removal device includes a heating chamber heated by hot air. The heating chamber is used to house and heat test tubes to be heated. A lead screw is vertically fixed at the center of the bottom of the heating chamber. The lead screw includes two sections of threads with opposite directions. Each section of the thread is threadedly engaged with a threaded feed assembly. The threaded feed assembly includes an internal threaded core that directly engages with the lead screw, and an external rotating body that is coaxially elastically sleeved with the internal threaded core through a preload spring. The preload spring allows the internal threaded core and the external rotating body to rotate relative to the lead screw as a single unit under a set torque. The outer rotating bodies of the two threaded feed assemblies are used to fix several tube plugs and test tubes in the annular array, and the tube plugs and test tubes are coaxially corresponding one by one, so that when the two threaded feed assemblies rotate synchronously and in the same direction and come closer to each other, the top port of all test tubes is inserted by their corresponding tube plugs. After being inserted into place, the inner thread core cannot continue to move axially, so that the outer rotating body rotates relative to the inner thread core, so as to make a circular motion together with the tube plugs and test tubes that are fixed together at this time. Each tube plug has a through vent hole in the axial direction. Each row of vent holes is fixedly connected to the auxiliary gas collection pipe through a corresponding vent pipe. The auxiliary gas collection pipe is arranged radially along the heating chamber and is fixedly connected to the bottom side of the main gas collection pipe, which is coaxially rotatably installed in the top of the heating chamber. The main gas collection pipe is also axially slidably and sealingly fitted to the top of the heating chamber. The main gas collection pipe is connected to an output pipe on the side wall outside the top of the heating chamber to finally output the acid gas.

[0008] Furthermore, a number of guide rods in a ring array are fixed at the end face of the upper outer rotating body so that when the upper outer rotating body is rotated, the lower outer rotating body also rotates synchronously; the top of the heating chamber is provided with a removable chamber cover.

[0009] Furthermore, at the end face of the upper outer rotating body, a number of guide rods in a ring array are fixed so that when the upper outer rotating body is rotated, the lower outer rotating body also rotates synchronously; each end of the guide rod is fixed with a sliding column with an increased diameter, and the sliding column is axially slidingly engaged with the corresponding blind holes on the end faces of the two outer rotating bodies so that the two outer rotating bodies are always connected through the guide rods; a chamber door is provided on one side of the heating chamber.

[0010] Furthermore, the internally threaded core includes a first cylindrical portion and a second cylindrical portion integrally formed sequentially. The top surface of the first cylindrical portion has an annular T-shaped groove, and a T-shaped slider is slidably installed in the T-shaped groove. A locking bolt is threaded into one end of the T-shaped slider, which is inserted into the top of the outer rotating body. The locking bolt is located inside the top of the outer rotating body, and causes the pressure-bearing cylindrical spring coaxially sleeved on the outside of the first cylindrical portion to be axially compressed. One end of the pressure-bearing cylindrical spring abuts against the end face of the second cylindrical portion, and the other end abuts against the inner top surface of the outer rotating body. The end face of the first cylindrical portion does not contact the upper and lower inner walls of the outer rotating body. The internally threaded core also includes a third cylindrical portion, and the second and third cylindrical portions are coaxially arranged with the shaft hole of the outer rotating body.

[0011] Furthermore, the two outer rotating bodies are respectively integrally fixed with an upper support and a lower support. The bottom of the upper support is fixed with several rings of tube plugs in a circular array, and the lower support has several tube clamps in a circular array for clamping the test tubes, and the clamping diameter of the tube clamps can be adjusted.

[0012] Furthermore, the main gas collecting pipe is a cylindrical structure with a hollow interlayer, the hollow interlayer being connected to the secondary gas collecting pipe, and the outer rotating body being coaxially and integrally fixed at the bottom center of the main gas collecting pipe.

[0013] Furthermore, the main gas collecting pipe passes through the top of the heating chamber and is fixedly installed with an annular cover. The annular cover is axially slidably sealed to the main gas collecting pipe. The hollow interlayer is provided with several air holes. When the pipe plug is inserted into the test tube, the main gas collecting pipe slides down to the position where all the air holes are located inside the annular cover, so as to achieve communication.

[0014] Furthermore, the upper outer rotating body has several insertion holes at its upper end; a transmission sleeve is coaxially sleeved on the top of the lead screw, and several transmission rods are fixed at the bottom of the transmission sleeve. After the transmission rods are inserted into the insertion holes, the rotation of the upper outer rotating body is achieved.

[0015] Furthermore, a driven gear is coaxially fixed to the top of the transmission sleeve. The driven gear meshes with a driving gear driven by the motor, and the thickness relationship between the two gears must satisfy the following condition: the two gears never disengage during the rotation and downward movement of the transmission sleeve. The lead screw is also equipped with limit rings at both the upper and lower ends to restrict the reset position of the two internal thread cores after they have moved away in the opposite direction.

[0016] Furthermore, after the motor starts, its speed intermittently increases and decreases, so that the liquid in the rotating test tube will have an oscillating and exhausting effect.

[0017] The beneficial effects of this invention are as follows: This automatic acid-removing device, through the cooperation of a ring array of tube plugs and test tubes, and two sets of corresponding threaded feed components, offers a more gradual heating compared to traditional devices such as graphite heating acid removal. It boasts greater adaptability, allows for larger sample volumes at once, and enables batch acid removal. Furthermore, it overcomes the uneven heating caused by different test tubes within the same batch being fixed in one position. The dynamic circular heating ensures that all test tubes within the same ring follow the same trajectory, achieving uniform heating and eliminating heating dead zones. This also ensures excellent uniformity during air heating, resulting in high consistency in the processing of samples from the same batch or of the same type. In short, the ring array of test tubes from the same batch moves with the outer rotating body, ensuring that all samples within the same ring are always under the same heating environment. This completely solves the problem of uneven heating caused by different placement positions of samples within the same batch in traditional devices, effectively guaranteeing the experimental accuracy and consistency of acid removal processing for the same batch.

[0018] Secondly, it has a large processing capacity and significantly improves the efficiency of acid removal operations. The lead screw is equipped with two sections of threads with opposite directions of rotation. Combined with the multi-turn annular array of tube plugs and test tube mounting bases, it can realize the simultaneous acid removal processing of multiple test tubes. This not only increases the number of samples of liquid to be removed from a single batch, but also completes the heating and acid removal of multiple batches of liquids at the same time. Compared with the graphite heating acid removal method, it has an absolute advantage in terms of processing quantity and greatly improves the overall processing efficiency of acid removal operations.

[0019] Furthermore, it boasts a high degree of automation, achieving coordinated control of test tube sealing and rotation. Utilizing the design of opposite screw thread directions and the slippage structure of the thread feed assembly, the drive mechanism can simultaneously drive two outer rotating bodies to approach each other along the screw axis and automatically complete the tube plug sealing. After sealing, the outer rotating bodies slip relative to the inner thread core and drive the test tube to rotate. The entire process requires no manual intervention, achieving automated linkage between test tube sealing and rotation, reducing manual operation steps, and lowering the intensity of manual labor.

[0020] Furthermore, the acid gas collection is efficient and controllable, combining environmental friendliness and practicality. In this invention, the tube plug has a through-hole exhaust port, and the exhaust pipe, auxiliary gas collection pipe and main gas collection pipe form a closed-loop acid gas collection channel, which can collect the acid gas generated by acid removal and transport it to the acid gas treatment device for subsequent treatment. At the same time, the exhaust pipe can be equipped with a solenoid valve or flow valve as needed, so that the acid discharge of a single test tube can be independently adjusted when necessary, adapting to the acid discharge requirements under different experimental conditions and improving the practicality of the device.

[0021] In summary, the circular arrangement and movement of test tubes not only enables batch testing but also allows for dynamic heating, ensuring uniform heating of test tubes within the same circle and laying the foundation for consistent acid removal.

[0022] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the automatic acid-removing device of the present invention during acid removal; Figure 2 This is a schematic diagram showing an initial position of the test tube and the tube plug of the automatic acid removal device of the present invention. Figure 3 This is a schematic diagram showing the separation of the tube stopper from the test tube. Figure 4 for Figure 1 A magnified view of the test tube and stopper when they are properly fitted together. Figure 5 for Figure 4 A cross-sectional view of the structure shown; Figure 6 for Figure 5 Another design drawing of the structure shown; Figure 7 This is a schematic diagram of a transmission sleeve.

[0024] In the diagram: 1. Heating chamber; 2. Lead screw; 3. Test tube; 4. Pipe plug; 5. Exhaust pipe; 6. Secondary gas collecting pipe; 7. Main gas collecting pipe; 8. Upper outer rotating body; 9. Internal threaded core; 9. First cylindrical part 901; 902. Second cylindrical part 902; 903. Third cylindrical part 903; 10. T-shaped slide groove; 11. T-shaped slider; 12. Locking bolt; 13. Insertion hole; 14. Guide rod; 15. Sliding column part; 16. Pressure-bearing cylindrical spring; 17. Hollow interlayer; 18. Air hole; 19. Annular cover; 20. Gas transmission pipe; 21. Transmission sleeve; 21. Flange; 22. Driven gear; 23. Driven gear; 24. Motor; 25. Transmission rod; 26. Limiting ring; 27. Upper bracket; 28. Lower bracket; 29. ​​Chamber cover; 30. Pipe clamp. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the 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 invention without inventive effort are within the scope of protection of the invention.

[0027] 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.

[0028] Please see Figures 1-3This invention provides a technical solution: an automatic acid removal device, wherein the heating chamber 1 has an embedded heating wire and a hot air circulation channel inside the shell side wall, or an existing heating device such as a built-in heating tube, to heat the air inside the heating chamber 1. Uniform heating is achieved inside the chamber through hot air circulation, thereby heating the liquid in the test tube 3 to be treated for acid removal. A lead screw 2 is vertically fixed at the bottom center of the heating chamber 1. The lead screw 2 includes two sections of threads with opposite directions of rotation. Each section of the thread has a threaded feed assembly. The threaded feed assembly includes an internal threaded core 9 that directly engages with the lead screw 2, and an external rotating body that is coaxially elastically sleeved with the internal threaded core 9 through a preload spring. The internal threaded core 9 is threaded onto the lead screw 2. The preload spring ensures that the internal threaded core 9 and the external rotating body maintain an integrated structure under normal conditions under axial compression force, allowing them to rotate relative to the lead screw 2 as a single unit under a set torque. However, if one of them cannot continue to rotate, and the torque is continuously applied, they will slip due to relative rotation.

[0029] like Figures 1-2As shown, several tube plugs 4 are fixed in a ring array at the bottom of the upper outer rotating body 8, and several test tube 3 mounting seats are fixed in a ring array at the top of the lower outer rotating body. The tube plugs 4 and the test tube 3 mounting seats are coaxially aligned one by one. The two rotating bodies rotate synchronously and are always coaxially aligned. In use, when the two threaded feed components are driven to rotate synchronously and in the same direction by the external drive mechanism, the two outer rotating bodies move closer to each other along the axis of the screw 2 because the two threads of the screw 2 have opposite directions of rotation, until the top ports of all test tubes 3 are inserted by their corresponding tube plugs 4. After the tube plugs 4 are inserted into the test tubes 3, the inner threaded core 9 can no longer move down. At this time, if the rotational driving force is continued to be applied, the outer rotating bodies will rotate relative to the inner threaded core 9, and the tube plugs 4 and test tubes 3, which are fixed as one unit, will make a circular motion together. In this way, each circle of test tubes 3, as multiple experimental samples of the same batch of acid-removing liquid, maintains the same heating environment. There will be no problem of uneven heating that may be caused by the different positions of the test tubes 3 in the same circle. The setting of multiple circles of test tubes 3 can realize the acid removal heating of multiple batches of liquid, which greatly increases the quantity of the acid-removing liquid, whether it is the same batch or different batches. Compared with graphite heating acid removal, it has an absolute advantage in terms of quantity. More specifically, each tube plug 4 has an axially oriented through-hole 18. All tube plug 4's through-holes 18 are fixedly connected to several auxiliary gas collecting pipes 6 via corresponding exhaust pipes 5. If individual adjustment of acid discharge from each test tube 3 is required, a solenoid valve or flow valve can be adaptively installed on the exhaust pipe 5 to automatically set its opening and closing, or to automatically open and close based on whether acid gas passes through the pipe. In this embodiment, the auxiliary gas collecting pipes 6 are arranged radially along the heating chamber 1. One end of each auxiliary gas collecting pipe 6 is connected to a corresponding number of exhaust pipes 5, and the other end is fixedly connected to the bottom side of the main gas collecting pipe 7, which is coaxially rotatably installed inside the top of the heating chamber 1, to concentrate the generated acid gas for discharge from the main gas collecting pipe 7. In this embodiment, the main gas collecting pipe 7 and the top of the heating chamber 1 are axially slidingly sealed by a sealing ring. The main gas collecting pipe 7 is located on the side wall outside the top of the heating chamber 1, and an output pipe is welded thereon. The output pipe is connected to an acid gas treatment device to finally output the acid gas generated during the acid removal process for subsequent processing such as condensation and collection.

[0030] The automatic acid removal device in this embodiment, such as Figure 5 As shown, at the lower end face of the upper outer rotating body 8, several guide rods in a circular array are fixed. These guide rods are evenly distributed around the circumference centered on the lead screw 2. Several guide holes are correspondingly provided at the upper end face of the lower outer rotating body. The guide rods are inserted into these guide holes, so that when the upper outer rotating body rotates, the lower outer rotating body also rotates synchronously through the transmission action of the guide rods. This, combined with the corresponding threaded pair, ensures the synchronous rotation of the two outer rotating bodies. Based on the above design structure, as... Figures 1-2As shown, the top of the heating chamber 1 is provided with a detachable chamber cover 29. When necessary, the chamber cover 29 can be opened to take out and put in the test tube 3 and to maintain the inside of the device. Alternatively, the chamber cover 29 can be installed together with the upper threaded feed assembly and its connected tube plug 4, etc., and the whole can be taken out or put in from the heating chamber 1.

[0031] As another embodiment, such as Figure 6 As shown, a number of guide rods in a ring array can be provided on the lower end face of the upper outer rotating body 8. Each end of the guide rod has an integrally formed sliding column portion 15 with an increased diameter. Blind holes are provided at corresponding positions on the upper end face of the lower outer rotating body and the lower end face of the upper outer rotating body 8. The sliding column portion 15 and the blind holes are axially slidably connected through clearance fit, so that the two outer rotating bodies are always connected through the guide rods when they move closer or further apart along the axial direction of the lead screw 2, without affecting their synchronous rotation, making installation and operation more convenient. Based on the above structural design, the heating chamber 1 can be set as an integral structure without the need for the chamber cover 29. However, a chamber door that can seal the heating chamber 1 needs to be opened on one side wall of the heating chamber 1. The chamber door is connected to the shell of the heating chamber 1 by a hinge. A sealing strip is provided on the edge of the chamber door. After the chamber door is closed, the heating chamber 1 can be sealed. After the chamber door is opened, the test tubes 3 can be rotated into place one by one, which allows the operator to easily load and unload the test tubes 3 outside the heating chamber 1.

[0032] In this embodiment, as Figure 5As shown, the internal thread core 9 in its threaded feed assembly includes a first cylindrical portion 901, a second cylindrical portion 902, and a third cylindrical portion 903, which are integrally formed sequentially. The top surface of the first cylindrical portion 901 is provided with an annular T-shaped groove 10. Several T-shaped sliders 11 are slidably installed in the T-shaped groove 10. A locking bolt 12 is screwed into one end of the T-shaped slider 11 that is inserted into the top of the outer rotating body. The locking bolt 12 is located inside the top of the outer rotating body, and the nut can be submerged in the top surface of the outer rotating body. The outer rotating body is coaxially sleeved on the outside of the first cylindrical part 901 and the second cylindrical part 902. A pressure-bearing cylindrical spring 16 is also provided between the inner top surface of the outer rotating body and the end face of the second cylindrical part 902. The pressure-bearing cylindrical spring 16 is coaxially sleeved on the outside of the first cylindrical part 901. Through the pre-tightening action of the locking bolt 12, the pressure-bearing cylindrical spring 16 is axially compressed. One end of it abuts against the end face of the second cylindrical part 902, and the other end abuts against the inner top surface of the outer rotating body. The end face of the first cylindrical part 901 does not contact the upper and lower inner walls of the outer rotating body to ensure the smoothness of the rotation of the outer rotating body relative to the internal thread core 9 and to ensure that relative rotation can be achieved. In order to improve the effect of relative rotation, a washer can be connected to each end of the pressure spring. The washer contacts the end face of the first cylindrical part 901 and the upper inner wall of the outer rotating body, respectively. As a specific manufacturing structure, the second cylindrical part 902 and the third cylindrical part 903 are coaxially arranged with the shaft hole of the outer rotating body. A reasonable gap is left between the shaft hole and the second cylindrical part 902 and the third cylindrical part 903 to further reduce rotational friction and maintain coaxiality.

[0033] In this embodiment, as Figures 1-2 As shown, the two outer rotating bodies are integrally fixed with an upper support 27 and a lower support 28 by welding. The two supports are designed to be adaptable, for example, both include a disc-shaped mesh structure. The centers of the upper support 27 and the lower support 28 are fixed to the outer rotating bodies. Several tube plugs 4 are fixed in a ring array at the bottom of the upper support 27. Several tube clamps 30 for clamping test tubes 3 are arranged in a ring array on the lower support 28, corresponding to the number of tube plugs 4. The clamping diameter of the tube clamps 30 can be adjusted to accommodate test tubes 3 of different specifications. Many such tube clamps 30 are available on the market and can be selected for use accordingly.

[0034] In this embodiment, as Figures 1-2As shown, the main gas collecting pipe 7 is a cylindrical structure with a hollow interlayer 17, so that when the test tube 3 moves in a circular motion, the exhaust gas can be concentrated towards the main collecting pipe. In practice, the exhaust holes 18 are arranged in a ring array, and the auxiliary gas collecting pipes 6 are also arranged in a ring array along the radial direction of the outer rotating body. Thus, several symmetrical connecting holes can be opened on the bottom side of the hollow interlayer 17. One end of several auxiliary gas collecting pipes 6 is fixedly connected to the connecting holes by welding, realizing the connection between the auxiliary gas collecting pipes 6 and the hollow interlayer 17 of the main gas collecting pipe 7. The top of the main gas collecting pipe 7 extends out of the heating chamber 1, and an output pipe is welded to its outer wall. The output pipe is connected to the hollow interlayer 17 of the main gas collecting pipe 7 for outputting the collected acid gas.

[0035] In this embodiment, as Figures 1-2 As shown, the main gas collecting pipe 7 passes through the top of the heating chamber 1. At the through-hole at the top of the heating chamber for the main gas collecting pipe 7, an annular cover 19 is coaxially fixed by welding. The annular cover 19 is made of stainless steel and has a circular structure. Its inner diameter matches the outer diameter of the main gas collecting pipe 7. A sliding sealing ring is provided between the inner wall of the annular cover 19 and the outer wall of the main gas collecting pipe 7 to achieve an axial sliding sealing connection. Several evenly distributed vents 18 are opened on the hollow interlayer 17 of the main gas collecting pipe 7 in the corresponding area of ​​the annular cover 19. When the plug 4 is inserted into the test tube 3, preparing for heating to expel acid, the main gas collecting pipe 7 slides down under axial force until all vents 18 are located inside the annular cover 19. At this point, the annular cover 19 surrounds the vents 18, achieving real-time communication between the auxiliary gas collecting pipe 6, the hollow interlayer 17 of the main gas collecting pipe 7, and the output pipe, ensuring smooth acid gas discharge. When the tube plug 4 is not inserted into place or when the test tube 3 needs to be removed or placed, the main gas collecting pipe 7 moves upward and the vent 18 moves out of the range of the annular cover 19. If necessary, a closed cover or residual gas suction pipe (not shown in the figure) can be provided directly above the heating chamber 1 so that when the acid is discharged and the tube plug 4 and the test tube 3 are separated to their original positions, the top of the corresponding main gas collecting pipe 7 can be inserted into the above-mentioned closed cover or residual gas suction pipe.

[0036] In this embodiment, as Figures 5-6As shown, the top of the upper outer rotating body 8 is evenly provided with several insertion holes 13. The insertion holes 13 are arranged in a ring array on the circumference centered on the lead screw 2. For example, there are three insertion holes 13. A transmission sleeve 21 is coaxially sleeved on the top of the lead screw 2. The inner diameter of the transmission sleeve 21 is adapted to the outer diameter of the lead screw 2, and there is a gap between them. Several transmission rods 25 are welded and fixed to the bottom of the transmission sleeve 21 through the flange 2101. The size of the transmission rods 25 matches the insertion holes 13. For example, there are three transmission rods 25. When the transmission sleeve 21 moves down, the transmission rods 25 are inserted into the insertion holes 13. The rotation of the upper outer rotating body is driven by the cooperation of the transmission rods 25 and the insertion holes 13, thereby driving the lower outer rotating body to rotate synchronously. This allows the two threaded feed components to share a single drive device. Of course, they can also each have a separate drive device, but the structure is more complex and it is more convenient to use when the above structure is not available.

[0037] In this embodiment, the drive structure for the rotation and axial movement of the transmission sleeve 21 is designed as follows: Figures 1-2 as well as Figure 7 A driven gear 22 is coaxially fixed to the top of the transmission sleeve 21 via a flat key. The driven gear 22 meshes with a driving gear 23 driven by the motor 24. The driving gear 23 and the driven gear 22 mesh, and their thickness relationship satisfies the condition that the two gears remain engaged during the downward rotation of the transmission sleeve 21, preventing disengagement. This cleverly achieves parallel rotation and axial movement of the transmission sleeve 21. Furthermore, to determine the initial positions of the two threaded feed assemblies, welding can be used to fix a drive gear 22 to both the upper and lower ends of the lead screw 2. Figure 1 The limiting rings 26 shown are located at the top of the left-hand thread and the bottom of the right-hand thread of the lead screw 2, respectively, and are used to limit the reset position of the two internal thread cores 9 after they move away in the opposite direction, so as to ensure the consistency of the device after each reset.

[0038] In this embodiment, the motor 24 driving the active gear 23 is a stepper motor 24. The speed of the motor 24 can be adjusted by the controller, i.e., an automatic speed-changing motor 24 is used. After starting, the motor 24 intermittently increases and decreases its speed according to a preset program. The specific operating parameters can be set according to actual needs. Through this intermittent speed-changing operation mode, the liquid in the rotating test tube 3 is subjected to periodically changing centrifugal force, thereby producing an oscillating exhaust effect. During the heating process, it promotes the rapid precipitation and discharge of acid gas, improving the acid removal efficiency. Thus, this automatic acid removal device not only relies on rotation to ensure that each test tube 3 on each revolution is heated evenly, with multiple revolutions of test tubes 3 corresponding to multiple batches of liquid to be removed from the acid, but also achieves oscillation by changing the speed of the circular motion, promoting rapid exhaust after heating. To a certain extent, it largely compensates for the lower efficiency of air heating compared to graphite and other heating methods. In use, the controller of the motor 24 can adjust the period and amplitude of the speed change according to the needs of the acid removal process.

[0039] In the above description of the present invention, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An automatic acid removal device, comprising a heating chamber (1) heated by hot air, the heating chamber (1) being used to house and heat a test tube (3) to be heated, characterized in that: A lead screw (2) is vertically fixed in the center of the bottom of the heating chamber (1). The lead screw (2) includes two threads with opposite directions. Each thread is threadedly fitted with a threaded feed assembly. The threaded feed assembly includes an internal thread core (9) that directly engages with the lead screw (2) and an external rotating body that is coaxially elastically sleeved with the internal thread core (9) through a preload spring. The preload spring enables the internal thread core (9) and the external rotating body to rotate relative to the lead screw (2) as a whole under a set torque. The outer rotating bodies of the two threaded feed assemblies are used to fix several tube plugs (4) and test tubes (3) in the annular array, and the tube plugs (4) and test tubes (3) are coaxially corresponding to each other, so that when the two threaded feed assemblies rotate synchronously and in the same direction and come close to each other, the top port of all test tubes (3) is inserted by a corresponding tube plug (4), and after being inserted into place, the inner thread core (9) cannot continue to move axially, so that the outer rotating body rotates relative to the inner thread core (9), so as to make a circular motion together with the tube plugs (4) and test tubes (3) that are fixed together at this time; Each plug (4) has a through vent (18) in the axial direction. Each row of vents (18) is fixedly connected to the auxiliary gas collection pipe (6) through a corresponding vent pipe (5). The auxiliary gas collection pipe (6) is arranged radially along the heating chamber (1) and is fixedly connected to the bottom side of the main gas collection pipe (7) which is coaxially rotatably installed in the top of the heating chamber (1). The main gas collection pipe (7) is also axially slidably and sealedly installed with the top of the heating chamber (1). The main gas collection pipe (7) is connected to an output pipe that finally outputs the acid gas on the side wall outside the top of the heating chamber (1).

2. The automatic acid removal device according to claim 1, characterized in that: At the end face of the upper outer rotating body (8), there are several ring arrays of guide rods fixed so that when the upper outer rotating body is rotated, the lower outer rotating body also rotates synchronously; the top of the heating chamber (1) is provided with a detachable chamber cover (29).

3. The automatic acid removal device according to claim 1, characterized in that: At the end face of the upper outer rotating body (8), a number of guide rods in a ring array are fixed so that when the upper outer rotating body is rotated, the lower outer rotating body also rotates synchronously; each end of the guide rod is fixed with a sliding column (15) with a larger diameter, and the sliding column (15) is axially slidingly engaged with the corresponding blind holes on the end faces of the two outer rotating bodies so that the two outer rotating bodies are always connected through the guide rods; a chamber door is provided on one side of the heating chamber (1).

4. The automatic acid removal device according to claim 1, characterized in that: The internal thread core (9) includes a first cylindrical part (901) and a second cylindrical part (902) integrally formed in sequence. The top surface of the first cylindrical part (901) has an annular T-shaped groove (10). A T-shaped slider (11) is slidably installed in the T-shaped groove (10). A locking bolt (12) is screwed into one end of the T-shaped slider (11) which is inserted into the top of the outer rotating body. The locking bolt (12) is located inside the top of the outer rotating body, so that the pressure-bearing cylindrical spring (16) coaxially sleeved on the outside of the first cylindrical part (901) is axially compressed. One end of the pressure-bearing cylindrical spring (16) abuts against the end face of the second cylindrical part (902), and the other end abuts against the inner top surface of the outer rotating body. The end face of the first cylindrical part (901) does not contact the upper and lower inner walls of the outer rotating body. The internal threaded core (9) also includes a third cylindrical portion (903), and the second cylindrical portion (902) and the third cylindrical portion (903) are coaxially arranged with the shaft hole of the outer rotating body.

5. The automatic acid removal device according to claim 1, characterized in that: Two external rotating bodies are fixed with an upper support (27) and a lower support (28) respectively. The bottom of the upper support (27) is fixed with several rings of tube plugs (4). The lower support (28) has several tube clamps (30) arranged in a ring for clamping the test tube (3), and the clamping diameter of the tube clamps (30) can be adjusted.

6. The automatic acid removal device according to claim 1, characterized in that: The main gas collecting pipe (7) is a cylindrical structure with a hollow interlayer (17). The hollow interlayer (17) is connected to the auxiliary gas collecting pipe (6). The outer rotating body is coaxially and integrally fixed at the bottom center of the main gas collecting pipe (7).

7. The automatic acid removal device according to claim 6, characterized in that: The main gas collecting pipe (7) passes through the top of the heating chamber (1) and is fixedly installed with an annular cover (19). The annular cover (19) is axially slidably sealed to the main gas collecting pipe (7). The hollow interlayer (17) is provided with several air holes (18). When the pipe plug (4) is inserted into the test tube (3), the main gas collecting pipe (7) slides down to the position where all the air holes (18) are located inside the annular cover (19) to achieve communication.

8. The automatic acid removal device according to claim 1, characterized in that: The upper outer rotating body (8) located at the top has several insertion holes (13); a transmission sleeve (21) is coaxially sleeved on the top of the lead screw (2), and several transmission rods (25) are fixed at the bottom of the transmission sleeve (21). After the transmission rods (25) are inserted into the insertion holes (13), the upper outer rotating body (8) is driven to rotate.

9. The automatic acid removal device according to claim 8, characterized in that: The top end of the transmission sleeve (21) is coaxially fixed with a driven gear (22), which meshes with a driving gear (23) driven by the motor (24), and the thickness relationship between the two gears must satisfy the following: the two gears never disengage during the rotation and downward movement of the transmission sleeve (21). The lead screw (2) is also provided with limiting rings (26) at both ends to limit the reset position of the two internal thread cores (9) after they move away from each other in the opposite direction.

10. The automatic acid removal device according to claim 9, characterized in that: After the motor (24) is started, its speed increases and decreases intermittently, so that the liquid in the rotating test tube (3) will have the effect of oscillating and venting.

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