A metering device for corrosive liquids

Abstract

The present invention discloses a metering device for corrosive liquids, which relates to the application field of metering and sampling devices. It includes a box body and an infusion pipeline. Inside the box body, there is a tray, and on the top of the tray, there is a fixing component for fixing a measuring cup movably installed. A lifting platform is movably installed on the top of the tray through a through groove opened. One side of the tray is rotatably connected to a lead screw, one end of the lead screw is connected to a driving component, and the outside of the lead screw is threadedly connected to a moving component for driving the fixing component to move. On one side of the tray, a drip-proof component is movably installed through a sliding frame. In the present invention, indirectly pushing the measuring cup to move by the moving component can reduce the contact of operators with dangerous sources. The moving component will drive the drip-proof component and the measuring cup to move synchronously, so that the measuring cup and the collecting tray cover the space where the infusion port of the infusion pipeline is located. When the infusion pipeline is aged or there is residual liquid, the dripping of corrosive liquid will be collected, preventing the corrosive liquid from corroding and damaging the equipment.

Description

Technical Field

[0001] The present invention relates to the field of metering sampling devices, and specifically to a metering device for corrosive liquids. Background Technique

[0002] Corrosive liquids refer to liquids that can damage or destroy the structure of substances (such as metals, skin, tissues, etc.). Such liquids have strong chemical reactivity and can react with other substances, causing changes in their physical or chemical properties. Common corrosive liquids include strong acids (such as sulfuric acid, hydrochloric acid, nitric acid) and strong bases (such as sodium hydroxide, potassium hydroxide).

[0003] The metering work of corrosive liquids mainly includes flow metering, liquid level metering, pressure metering, temperature metering, quantitative metering, weighing metering, sampling analysis, etc. The working principles involved in different metering works are different. For example, flow metering usually uses electromagnetic flowmeters to monitor the flow rate of metered liquids, which is suitable for transporting corrosive liquids in industrial pipelines. Quantitative metering usually uses tools such as measuring cylinders and measuring cups to measure a fixed volume of liquid, which is suitable for small-scale sampling analysis or experimental purposes. Weighing metering determines the amount of liquid by weighing the mass of the container and the liquid, which is suitable for weight quality inspection in the procurement link.

[0004] In practical applications, for example, quantitative sampling work is involved in corrosive liquid transport vehicles or when measuring a certain volume of corrosive liquid in experiments. When quantitatively sampling corrosive liquids, appropriate tools and equipment must be selected considering the corrosive characteristics of the corrosive liquids to ensure the safety of personnel and equipment during quantitative sampling. Minimizing contact and preventing liquid splashing during quantitative sampling of corrosive liquids can effectively improve the safety of the metering work. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a metering device for corrosive liquids to solve the technical problems mentioned in the above background.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A metering device for corrosive liquids, including a box body. A liquid infusion pipeline penetrates through the top of the box body, and a tray is arranged inside the box body. A fixing component for fixing a measuring cup is movably installed on the top of the tray. A lifting platform is movably installed on the top of the tray through a through groove, and a telescopic cylinder is arranged at the bottom of the lifting platform. One side of the tray is rotatably connected to a lead screw, and one end of the lead screw is connected to a driving component. A moving component for driving the fixing component to move is threadedly connected to the outside of the lead screw. An anti-drip component is movably installed on one side of the tray through a sliding frame.

[0007] By adopting the above technical solution, the fixed component is pushed to move by setting the moving component, so as to achieve the purpose of moving the measuring cup. Indirectly pushing the measuring cup to move by the moving component can reduce the operator's contact with the hazard source, improve the safety of the measuring work, and when the moving component works to push the measuring cup to move just to dock with the collection tray, the moving component will drive the whole anti-drip component and the measuring cup to move synchronously, so that the measuring cup and the collection tray cover the space where the infusion port of the infusion pipeline is located. When the infusion pipeline leaks liquid due to aging or experiencing the measuring work, the corrosive liquid drip will be collected by the measuring cup or the collection tray, preventing the corrosive liquid from corroding and damaging the equipment.

[0008] The present invention is further configured such that the fixed component includes a base, and a first limiting block is provided at the bottom of the base, and a convex block is provided on one side of the base. A plurality of second guide rods are provided inside the base, and fixing blocks and second springs are sleeved outside the plurality of second guide rods. And fixing rods are provided at the bottoms of the plurality of fixing blocks. A plurality of strip-shaped grooves matching the fixing rods are opened at the top of the base, and a movable plate is rotatably connected to the top of the base, and a plurality of arc-shaped grooves matching the fixing rods are opened at the top of the movable plate.

[0009] Preferably, by setting the fixed component, it can be used to clamp the measuring cup, and then driving the fixed component to move can drive the measuring cup to move towards the inside of the box body, so that there is a certain distance between the operator and the infusion pipeline when placing the measuring cup, improving the safety of the measuring work.

[0010] The present invention is further configured such that first limiting grooves matching the first limiting blocks are opened at the tops of the tray and the lifting table.

[0011] Preferably, by setting the first limiting block and the first limiting groove, the fixed component can slide between the tray and the lifting table.

[0012] The present invention is further configured such that the moving component includes a moving seat threadedly connected to a lead screw, and a fitting groove matching the convex block is opened at the bottom of the moving seat, and the top of the fitting groove is provided as an inclined surface. A second limiting block is provided at the bottom of the moving seat, and a pushing block for pushing the anti-drip component is provided on the side surface of the moving seat. A second limiting groove matching the second limiting block is provided on one side of the tray.

[0013] Preferably, by setting the moving component, it can not only push the fixed component to move, but also push the anti-drip component to move, reducing the manual operation of the operator and improving the safety of the measurement.

[0014] The present invention is further configured such that the anti-drip component includes a housing movably installed inside a sliding frame, a connecting rod is rotatably connected to the bottom of the housing, a collection tray is provided at the bottom of the connecting rod, and a gear set is connected to the bottom of the connecting rod.

[0015] Preferably, by providing a drip-proof component, the corrosive liquid remaining in the infusion tube can be collected, preventing the corrosive liquid remaining in the infusion tube from dripping into the device interior and causing device corrosion. A gear set is provided at the bottom of the connecting rod of the drip-proof component. The gear set has multiple gear components with different parameters for changing the gear ratio, ensuring that the collection tray rotates a certain angle to avoid other devices when the drip-proof component moves a short distance.

[0016] The present invention is further configured such that a third guide rod is provided on one side of the housing, and a third spring is sleeved outside the third guide rod. The third guide rod and the sliding frame are movably penetrated. A rack is provided inside the sliding frame, and the rack meshes with the gear set. A semi-circular groove matching the pushing block is provided at one end of the sliding frame.

[0017] Preferably, by providing the third guide rod and the third spring, the drip-proof component can be automatically reset, and the rack is provided for driving the gear set to transmit power.

[0018] The present invention is further configured such that an outer convex ring is provided outside the infusion tube, and a splash-proof cover plate is sleeved outside the infusion tube. Multiple groups of first guide rods are provided on the top of the splash-proof cover plate, and first springs are sleeved outside each group of first guide rods. Each group of first guide rods and the outer convex ring are movably penetrated. Inclined exhaust holes are provided at the bottom of the splash-proof cover plate.

[0019] Preferably, by providing the splash-proof cover plate to fit the measuring cup, the splashing of the corrosive liquid can be reduced, and the inclined exhaust holes provided on the splash-proof cover plate can also prevent the corrosive liquid from splashing out through the inclined exhaust holes.

[0020] The present invention is further configured such that a distance sensor for measuring the distance between the outer convex ring and the splash-proof cover plate is provided at the bottom of the outer convex ring, and a solenoid valve is provided on the side of the infusion tube.

[0021] Preferably, by providing the distance sensor to monitor the distance between the outer convex ring and the splash-proof cover plate, and using the obtained electrical signal data to control the telescopic formation of the telescopic cylinder, the purpose of quantitative measurement can be achieved.

[0022] The present invention is further configured such that both the splash-proof cover plate and the collection tray are made of corrosion-resistant materials.

[0023] Preferably, by using corrosion-resistant materials to make the splash-proof cover plate and the collection tray, damage to the device can be avoided. A hatch that can be opened is provided on the side of the box body, facilitating the maintenance of the device and the regular maintenance and cleaning of the collection tray.

[0024] In summary, the present invention mainly has the following beneficial effects:

[0025] In the present invention, a movable and telescopic splash-proof cover plate is provided outside the infusion pipeline, which can reduce the splash of corrosive liquid. The measuring cup is movably installed in the tray by a fixing component, and the fixing component drives the measuring cup to move from the station for placing the measuring cup to the station for quantitative sampling of liquid, so that there is still a certain distance between the operator and the hazard source when taking the measuring cup, improving the safety of quantitative sampling. When quantitatively measuring corrosive liquid, the telescopic cylinder pushes the measuring cup to rise so that the infusion pipeline penetrates to the bottom of the measuring cup. At this time, since the distance between the bottom of the measuring cup and the infusion port of the infusion pipeline is close, the splash of liquid can be effectively reduced, and the top of the measuring cup is blocked by the splash-proof cover plate to further prevent the splash of corrosive liquid during measurement, improving the safety of corrosive liquid during measurement.

[0026] In the present invention, a moving component is provided to push the fixing component to move, so as to achieve the purpose of moving the measuring cup. Indirectly pushing the measuring cup to move by the moving component can reduce the contact between the operator and the hazard source, improve the safety of the measuring work, and when the moving component works to push the measuring cup to move just to dock with the collecting tray, the moving component drives the whole anti-drip component and the measuring cup to move synchronously, so that the measuring cup and the collecting tray cover the space where the infusion port of the infusion pipeline is located. When the infusion pipeline leaks liquid due to aging or experiencing the measuring work, the corrosive liquid drip will be collected by the measuring cup or the collecting tray, preventing the corrosive liquid from corroding and damaging the equipment. Description of the Drawings

[0027] Figure 1 is the overall structural schematic diagram of the present invention;

[0028] Figure 2 is the internal structural schematic diagram of the box body of the present invention;

[0029] Figure 3 is the installation schematic diagram of the infusion pipeline, the outer convex ring, the splash-proof cover plate and the distance sensor of the present invention;

[0030] Figure 4 is the distribution schematic diagram of the splash-proof cover plate and the inclined exhaust holes of the present invention;

[0031] Figure 5 is the distribution schematic diagram of the tray, the fixing component, the lifting platform and the anti-drip component of the present invention;

[0032] Figure 6 is the structural schematic diagram of the fixing component of the present invention;

[0033] Figure 7 is the internal structural schematic diagram of the fixing component of the present invention;

[0034] Figure 8 is the structural schematic diagram of the moving component of the present invention;

[0035] Figure 9 is the internal structural schematic diagram of the anti-drip component of the present invention;

[0036] Figure 10 Schematic diagram of the housing of the drip - proof component fitted with the moving component of the present invention;

[0037] Figure 11 Schematic diagram of the measuring cup of the present invention moved to be flush with the side of the infusion pipeline;

[0038] Figure 12 Schematic diagram of the collection tray completed rotation when the measuring cup of the present invention is moved directly below the infusion pipeline.

[0039] Explanation of reference numerals:

[0040] 1. Box body; 2. Infusion pipeline; 3. Outer convex ring; 4. Splash - proof cover plate; 5. First guide rod; 6. First spring; 7. Inclined exhaust hole; 8. Solenoid valve; 9. Distance sensor; 10. Tray; 11. Lifting platform; 12. Telescopic cylinder; 13. First limit groove; 14. Fixing component; 1401. Base; 1402. First limit block; 1403. Convex block; 1404. Second guide rod; 1405. Fixed block; 1406. Second spring; 1407. Fixed rod; 1408. Strip - shaped groove; 1409. Movable plate; 1410. Arc - shaped groove; 15. Lead screw; 16. Driving component; 17. Moving component; 1701. Moving seat; 1702. Fitting groove; 1703. Inclined plane; 1704. Second limit block; 1705. Pushing block; 18. Second limit groove; 19. Sliding frame; 20. Drip - proof component; 2001. Housing; 2002. Connecting rod; 2003. Collection tray; 2004. Gear set; 21. Third guide rod; 22. Third spring; 23. Rack; 24. Semi - arc groove; 25. Hatch. Detailed implementation manners

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0042] The embodiments of the present invention will be described below according to its overall structure.

[0043] Please refer to Figure 1 - Figure 12, A metering device for corrosive liquids, comprising a box body 1. A liquid infusion pipeline 2 penetrates through the top of the box body 1 and extends into the interior of the box body 1. A tray 10 is arranged inside the box body 1. And a fixing component 14 for fixing a measuring cup is movably installed on the top of the tray 10. The fixing component 14 can slide at the bottom of the tray 10. A lifting platform 11 is movably installed on the top of the tray 10 by opening a through groove. And a telescopic cylinder 12 is arranged at the bottom of the lifting platform 11. A lead screw 15 is rotatably connected to the side of the tray 10. And one end of the lead screw 15 is connected to a driving component 16. And a moving component 17 for driving the fixing component 14 to move is threadedly connected to the outside of the lead screw 15. The driving component 16 drives the lead screw 15 to rotate, thereby driving the moving component 17 to move. The movement of the moving component 17 can drive the fixing component 14 to slide between the tray 10 and the lifting platform 11. The lifting platform 11 is located directly below the liquid infusion pipeline 2. A drip-proof component 20 is movably installed on one side of the tray 10 by arranging a sliding frame 19. The drip-proof component 20 can collect the residual corrosive liquid in the liquid infusion pipeline 2.

[0044] In the above embodiment, specifically refer to Figure 6 - Figure 7 , The fixing component 14 includes a base 1401. And a first limiting block 1402 is arranged at the bottom of the base 1401. And a convex block 1403 is arranged on one side of the base 1401. A plurality of groups of second guide rods 1404 are arranged inside the base 1401. And fixing blocks 1405 and second springs 1406 are sleeved on the outside of the plurality of groups of second guide rods 1404. And fixing rods 1407 are arranged at the tops of the plurality of groups of fixing blocks 1405. A plurality of strip-shaped grooves 1408 matching the fixing rods 1407 are opened at the top of the base 1401. And a movable plate 1409 is rotatably connected to the top of the base 1401. And a plurality of arc-shaped grooves 1410 matching the fixing rods 1407 are opened at the bottom of the movable plate 1409. By arranging the fixing component 14, it can be used to clamp the measuring cup. Furthermore, driving the fixing component 14 to move can drive the measuring cup to move into the interior of the box body 1, so that the operator has a certain safety distance from the liquid infusion pipeline 2 when placing the measuring cup, improving the safety of the measuring work.

[0045] In the above embodiment, specifically refer to again Figure 5 , First limiting grooves 13 matching the first limiting block 1402 are opened at the tops of both the tray 10 and the lifting platform 11. By arranging the first limiting block 1402 and the first limiting grooves 13, the fixing component 14 can slide between the tray 10 and the lifting platform 11.

[0046] In the above embodiment, specifically refer to again Figure 8, the moving component 17 includes a moving seat 1701 threadedly connected to the lead screw 15. A fitting groove 1702 matching the bump 1403 is formed at the bottom of the moving seat 1701, and the top of the fitting groove 1702 is set as an inclined surface 1703. A second limiting block 1704 is arranged at the bottom of the moving seat 1701, and a pushing block 1705 for pushing the anti-drip component 20 is arranged on the side of the moving seat 1701. A second limiting groove 18 matching the second limiting block 1704 is arranged on one side of the tray 10. By setting the moving component 17, not only can the fixed component 14 be pushed to move, but also the anti-drip component 20 can be pushed to move, reducing the manual operation of the operator and improving the safety of measurement.

[0047] In the above embodiment, specifically, please refer to Figure 9 , the anti-drip component 20 includes a housing 2001 movably installed inside the sliding frame 19. A connecting rod 2002 is rotatably connected to the bottom of the housing 2001, and a collecting tray 2003 is arranged at the bottom of the connecting rod 2002. A gear set 2004 is connected to the bottom of the connecting rod 2002. By setting the anti-drip component 20, the corrosive liquid remaining in the infusion pipeline 2 can be collected, preventing the corrosive liquid remaining in the infusion pipeline 2 from dripping into the equipment and causing equipment corrosion. A gear set 2004 is arranged at the bottom of the connecting rod 2002 of the anti-drip component 20. The gear set 2004 is composed of gears with different parameters, which is used to change the gear ratio to ensure that the collecting tray 2003 rotates a certain angle when the anti-drip component 20 moves a short distance, avoiding other equipment.

[0048] In the above embodiment, specifically, please refer to Figure 5 , a third guide rod 21 is arranged on one side of the housing 2001, and a third spring 22 is sleeved outside the third guide rod 21. The third guide rod 21 and the sliding frame 19 are movably penetrated. A rack 23 is arranged inside the sliding frame 19, and the rack 23 meshes with the gear set 2004. A semi-circular groove 24 matching the pushing block 1705 is formed at one end of the sliding frame 19. By setting the third guide rod 21 and the third spring 22, the anti-drip component 20 can be automatically reset, and the rack 23 is used to drive the gear set 2004 to rotate and work.

[0049] In the above embodiment, specifically, please refer to Figure 2 and Figure 3, an outer convex ring 3 is provided on the outside of the infusion tube 2, and a splash-proof cover plate 4 is sleeved on the outside of the infusion tube 2. A plurality of first guide rods 5 are provided on the top of the splash-proof cover plate 4, and a first spring 6 is sleeved on the outside of each of the plurality of first guide rods 5. Moreover, the plurality of first guide rods 5 and the outer convex ring 3 are movably penetrated. An inclined exhaust hole 7 is opened at the bottom of the splash-proof cover plate 4. By arranging the splash-proof cover plate 4 to fit the measuring cup, the splashing of corrosive liquid can be reduced. And the inclined exhaust hole 7 is arranged on the splash-proof cover plate 4, which can also prevent the corrosive liquid from splashing out through the inclined exhaust hole 7.

[0050] In the above embodiment, specifically, please refer to Figure 3 , a distance sensor 9 for measuring the distance between the outer convex ring 3 and the splash-proof cover plate 4 is provided at the bottom of the outer convex ring 3, and a solenoid valve 8 is provided on the side surface of the infusion tube 2. By arranging the distance sensor 9 to monitor the distance between the outer convex ring 3 and the splash-proof cover plate 4, the telescopic formation of the telescopic cylinder 12 is controlled with this as the electrical signal data, so as to achieve the purpose of quantitative measurement.

[0051] In the above embodiment, specifically, please refer to Figure 1 , both the splash-proof cover plate 4 and the collection tray 2003 are made of corrosion-resistant materials. By using corrosion-resistant materials to make the splash-proof cover plate 4 and the collection tray 2003, the damage of the equipment can be avoided. And a hatch 25 that can be opened is provided on the side surface of the box body 1, which is convenient for repairing the equipment and regularly maintaining and cleaning the collection tray 2003.

[0052] When the present invention works specifically: First, the operator takes a suitable measuring cup and rotates the movable plate 1409. The plurality of arc-shaped grooves 1410 on the top of the movable plate 1409 are used to squeeze the plurality of fixed rods 1407, so that the fixed rods 1407 slide along the strip-shaped grooves 1408, so that the plurality of fixed blocks 1405 compress the second spring 1406 and shrink into the inside of the base 1401. Then the measuring cup is snapped into the fixing assembly 14, and the movable plate 1409 is released. Under the reset action of the plurality of second springs 1406, the fixed blocks 1405 are reset to limit and fix the measuring cup.

[0053] Then, according to the required volume, press the button for the specified volume, such as 10ML, 15ML or 30ML, and then press the start button. The control program in the device starts the drive component 16 to drive the lead screw 15 to rotate, and then the moving component 17 moves along the lead screw 15 and pushes the fixed component 14 to move. The fixed component 14 drives the measuring cup into the interior of the box body 1. When the pushing block 1705 of the moving component 17 moves to fit the semi-circular groove 24 and the housing 2001 of the anti-drip component 20, next, the movement of the moving component 17 will not only drive the fixed component 14 to move but also push the anti-drip component 20 to move synchronously. When the pushing block 1705 of the moving component 17 fits the housing 2001, the edge of the measuring cup extends a certain distance beyond the edge of the collection tray 2003. Then, when the measuring cup and the collection tray 2003 move synchronously below the infusion tube 2, as the collection tray 2003 gradually moves away from directly below the infusion tube 2, since there is a short distance overlap between the edge of the measuring cup and the edge of the collection tray 2003, both the measuring cup and the collection tray 2003 can cover the space where the infusion tube 2 is located.

[0054] As the measuring cup and the anti-drip component 20 continue to move, when the measuring cup is displaced directly below the infusion tube 2, that is, when the axis of the measuring cup is aligned with the axis of the infusion tube 2, at this time, the measuring cup and the collection tray 2003 still maintain a relatively close distance, and the large volume of the collection tray 2003 affects the normal operation of the device. Therefore, in this application, refer to Figure 11 , when the B point of the measuring cup coincides with the A point of the infusion tube 2, the gear set 2004 and the rack 23 in the anti-drip component 20 start to mesh. The gear set 2004 is composed of multiple gears with different gear ratio parameters. By setting the gear set 2004, the anti-drip component 20 can move a short distance to achieve a certain angle of rotation of the connecting rod 2002, so that the collection tray 2003 rotates a certain angle away from below the infusion tube 2 to ensure the normal operation of the device.

[0055] The moving component 17 continuously moves to drive the fixed component 14 to be displaced directly above the lifting platform 11, that is, the measuring cup is displaced directly below the infusion pipeline 2. Then the telescopic cylinder 12 operates to push the fixed component 14 upward. As a result, the measuring cup rises and fits with the splash-proof cover 4, and the splash-proof cover 4 is pushed upward. When the splash-proof cover 4 rises, it will compress the first spring 6. During the operation of the device, the measuring cup will first rise to the maximum value, enabling the infusion pipeline 2 to completely penetrate into the interior of the measuring cup. Then the control program of the device activates the solenoid valve 8 to start injecting the corrosive liquid in the infusion pipeline 2 into the interior of the measuring cup. As the corrosive liquid in the measuring cup is slowly injected, the telescopic cylinder 12 will synchronously drive the measuring cup to lower in height. Since the operator selects to measure a specified volume of corrosive liquid, the distance sensor 9 monitors the distance between the outer convex ring 3 and the splash-proof cover 4 and controls the opening and closing of the solenoid valve 8 based on the corresponding electrical signal data. When the measuring cup completes the measurement of the corrosive liquid, for example, when measuring 30 ML, the corresponding telescopic cylinder 12 will also drive the measuring cup to descend to the specified height, and the distance sensor 9 controls the solenoid valve 8 to close through data feedback.

[0056] Next, according to the above steps, the measuring cup that has completed the measurement can be withdrawn from the box body 1, and the operator can wear protective gloves to pick up the measuring cup.

[0057] Although the embodiments of the present invention have been shown and described, this specific embodiment is only an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can, without departing from the principles and purposes of the present invention, make modifications, substitutions, and variations that do not contribute creatively to the embodiments as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A corrosive liquid metering device, comprising a housing (1), characterized in that: A liquid infusion pipeline (2) is provided through the top of the box body (1), a tray (10) is provided inside the box body (1), a fixing assembly (14) for fixing a measuring cup is movably installed on the top of the tray (10), a lifting platform (11) is movably installed on the top of the tray (10) through a through slot, a telescopic cylinder (12) is provided at the bottom of the lifting platform (11), a screw rod (15) is rotatably connected to the side of the tray (10), one end of the screw rod (15) is connected to a driving assembly (16), and an external screw of the screw rod (15) is provided. The tray (10) is provided with a moving assembly (17) for driving the fixed assembly (14) to move. A sliding frame (19) is provided on one side of the tray (10) to movably install an anti-drip assembly (20). The moving assembly (17) includes a moving seat (1701) threadedly connected to the screw rod (15). The bottom of the moving seat (1701) is provided with an engaging groove (1702) matching the protrusion (1403). The top of the engaging groove (1702) is provided with an inclined surface (1703). The bottom of the moving seat (1701) is provided with A second limiting block (1704) is provided on the side of the movable seat (1701) with a pushing block (1705) for pushing the anti-drip assembly (20); a second limiting groove (18) matching the second limiting block (1704) is provided on one side of the tray (10); the anti-drip assembly (20) comprises a shell (2001) movably mounted inside the sliding frame (19); a connecting rod (2002) is rotatably connected to the bottom of the shell (2001); and a collecting plate (2003) is provided at the bottom of the connecting rod (2002). The bottom of the connecting rod (2002) is connected to a gear set (2004), a third guide rod (21) is provided on one side of the housing (2001), a third spring (22) is sleeved on the outside of the third guide rod (21), the third guide rod (21) and the sliding frame (19) are movably interwoven, a rack (23) is provided inside the sliding frame (19), the rack (23) and the gear set (2004) are meshed with each other, and a semi-arc groove (24) matching the push block (1705) is provided at one end of the sliding frame (19).

2. A metering device for corrosive liquids according to claim 1, characterized in that: The fixing assembly (14) comprises a base (1401), the bottom of the base (1401) is provided with a first limit block (1402), one side of the base (1401) is provided with a protrusion (1403), a plurality of groups of second guide rods (1404) are provided inside the base (1401), the outsides of the plurality of groups of second guide rods (1404) are sleeved with fixing blocks (1405) and second springs (1406), the tops of the plurality of groups of fixing blocks (1405) are provided with fixing rods (1407), the top of the base (1401) is provided with a plurality of groups of strip grooves (1408) matching the fixing rods (1407), the top of the base (1401) is provided with a movable plate (1409) rotatably connected, and the bottom of the movable plate (1409) is provided with a plurality of groups of arc grooves (1410) matching the fixing rods (1407).

3. A metering device for corrosive liquids according to claim 2, characterized in that: The tops of the tray (10) and the lifting platform (11) are both provided with a first limiting groove (13) that matches the first limiting block (1402).

4. A metering device for corrosive liquids according to claim 3, characterized in that: An outer convex ring (3) is arranged on the outside of the infusion pipeline (2), a splash-proof cover plate (4) is sleeved on the outside of the infusion pipeline (2), a plurality of groups of first guide rods (5) are arranged on the top of the splash-proof cover plate (4), a first spring (6) is sleeved on the outside of the plurality of groups of first guide rods (5), the plurality of groups of first guide rods (5) and the outer convex ring (3) are movably arranged to penetrate each other, and an inclined exhaust hole (7) is opened at the bottom of the splash-proof cover plate (4).

5. A metering device for corrosive liquids according to claim 4, characterized in that: A distance sensor (9) for measuring the distance between the outer convex ring (3) and the splash-proof cover plate (4) is arranged at the bottom of the outer convex ring (3), and a solenoid valve (8) is arranged on the side of the infusion pipeline (2).

6. A metering device for corrosive liquids according to claim 5, characterized in that: The splash-proof cover plate (4) and the collecting tray (2003) are both made of corrosion-resistant materials.

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