Multi-stage purification device for treating tin stripping waste liquid based on oxalic acid

Abstract

The utility model relates to a multistage purification device for treating tin stripping waste liquid based on oxalic acid, which belongs to the field of tin stripping waste liquid treatment and comprises a reaction kettle, a settling tank fixedly communicated with the right side of the reaction kettle, a filter box fixedly communicated with the right side of the settling tank and a liquid inlet pipe fixedly communicated with the top of the reaction kettle, the top of the reaction kettle is provided with a conveying structure which extends into the reaction kettle and is used for oxalic acid addition control, and the top of the reaction kettle is provided with a stirring structure which extends into the reaction kettle and is used for fully mixing oxalic acid and waste liquid. According to the multi-stage purification device for treating the tin stripping waste liquid based on oxalic acid, when a double-shaft motor works, an eccentric block on an output shaft at the right end of the double-shaft motor drives a piston plate to move up and down in a connecting cylinder through cooperation of a transmission plate and a reset spring, and quantitative conveying and adding of oxalic acid are achieved; the double-shaft motor drives the rotating sleeve and the rotating rod to rotate to drive the stirring shaft to rotate, so that oxalic acid and waste liquid are fully mixed, the precipitation efficiency is improved, and the advantage of high precipitation efficiency is achieved.

Description

Technical Field

[0001] This utility model relates to the field of tin stripping waste liquid treatment technology, specifically a multi-stage purification device based on oxalic acid treatment of tin stripping waste liquid. Background Technology

[0002] Solder stripping solution is one of the main chemical materials used in the production of printed circuit boards (PCBs). It is used to remove tin plating, tin-lead alloy plating, and tin solder joints. During the manufacturing process of PCBs, solder stripping solution is needed to remove the tin protective layer on the PCBs. This process generates solder stripping waste liquid, which cannot be directly discharged and therefore needs to be treated.

[0003] In the electronics industry, the treatment of tin stripping waste liquid is an important environmental issue. While existing methods for treating tin stripping waste liquid with oxalic acid employ metering pumps, they fail to address the issue of synchronous coupling between the dosage and stirring speed. The lack of dynamic linkage between the oxalic acid dosing rate and the stirring shaft speed leads to localized supersaturation or uneven dispersion of reactants, resulting in fine and easily agglomerated precipitates. Therefore, a multi-stage purification device based on oxalic acid treatment of tin stripping waste liquid is proposed to solve the aforementioned problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a multi-stage purification device for treating tin stripping waste liquid with oxalic acid. It has the advantages of high precipitation efficiency and multi-stage purification. It solves the problem that although existing methods for treating tin stripping waste liquid with oxalic acid use metering pumps to add oxalic acid, the problem of synchronous coupling between the dosage and stirring speed is not solved. The lack of dynamic linkage between the oxalic acid addition rate and the stirring shaft speed leads to local oversaturation or uneven dispersion of reactants, resulting in fine precipitate particles that are easy to agglomerate.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage purification device for treating tin stripping waste liquid based on oxalic acid, comprising a reaction vessel, a sedimentation tank fixedly connected to the right side of the reaction vessel, a filter box fixedly connected to the right side of the sedimentation tank, and an inlet pipe fixedly connected to the top of the reaction vessel. The top of the reaction vessel is provided with a conveying structure extending into its interior for controlling the addition of oxalic acid, and the top of the reaction vessel is provided with a stirring structure extending into its interior for fully mixing oxalic acid and waste liquid.

[0006] The conveying structure includes a liquid storage cylinder and a connecting pipe fixedly connected to the top of the reactor, a connecting cylinder fixedly connected to the top of the connecting pipe, a piston plate slidably connected inside the connecting cylinder, a transmission rod fixedly connected to the top of the piston plate, a transmission plate fixedly connected to the top of the transmission rod, a reset spring set at the bottom of the transmission plate, and an eccentric block set at the top of the transmission plate.

[0007] The stirring structure includes a rotating sleeve rotatably connected inside the reactor, a rotating rod fixedly installed inside the rotating sleeve, a stirring shaft fixedly connected outside the rotating rod, and a transmission mechanism located at the top of the reactor.

[0008] Furthermore, the return spring is fixedly installed on the top of the transmission plate and the connecting cylinder, the return spring is connected to the outside of the transmission rod, and the transmission rod is slidably connected to the inside of the connecting cylinder and extends to its upper surface.

[0009] Furthermore, an extraction pipe is fixedly connected between the connecting pipe and the liquid storage cylinder, and a delivery pipe is fixedly connected between the connecting pipe and the reaction vessel. One-way valve plates arranged opposite each other are rotatably installed on the left and right sides inside the connecting pipe.

[0010] Furthermore, the transmission mechanism includes a motor base fixedly connected to the top of the reactor, a dual-shaft motor fixedly mounted on the top of the motor base, a driven gear fixedly mounted on the outside of the rotating sleeve, and a transmission gear fixedly mounted on the left output shaft of the dual-shaft motor.

[0011] Furthermore, the transmission gear and the driven gear mesh with each other, and the eccentric block is fixedly installed on the right output shaft of the dual-shaft motor.

[0012] Furthermore, there are several stirring shafts, which are distributed at equal intervals outside the rotating rod, and both the stirring shafts and the rotating rod are rotatably connected to the inside of the reactor.

[0013] Furthermore, an electric push rod extending into the interior of the sedimentation tank is fixedly installed on the top of the sedimentation tank, and a filter press plate is fixedly connected to the output end of the electric push rod. A baffle is fixedly connected inside the sedimentation tank and on the lower surface of the filter press plate.

[0014] Furthermore, the filter box has two filter screens slidably connected inside, and the filter box has a retrieval port that matches the filter screen. The filter box is also fixedly connected to a drain pipe on the outside.

[0015] Compared with the prior art, this utility model provides a multi-stage purification device based on oxalic acid treatment of tin stripping waste liquid, which has the following beneficial effects:

[0016] 1. This multi-stage purification device based on oxalic acid treatment of tin stripping waste liquid, when the dual-shaft motor is working, the eccentric block on the right output shaft drives the piston plate to move up and down in the connecting cylinder through the cooperation of the transmission plate and the return spring. The up and down movement of the piston plate is transmitted through the transmission rod to realize the quantitative delivery and addition of oxalic acid. Through the meshing of the transmission gear and the driven gear on the left output shaft of the dual-shaft motor, the rotating sleeve and the rotating rod are driven to rotate, which drives the stirring shaft to rotate, so that the oxalic acid and the waste liquid are fully mixed, improving the precipitation efficiency and achieving the advantage of high precipitation efficiency.

[0017] 2. This multi-stage purification device based on oxalic acid treatment of tin stripping waste liquid uses an electric push rod to extend and retract, driving the filter plate to squeeze the liquid after precipitation. This further removes tin precipitates from the mixture, improves the precipitation effect, and makes the mixture more thoroughly purified. By setting up a filter screen, the liquid can be filtered in multiple stages, effectively intercepting residual fine impurities in the liquid, further improving the degree of purification of the liquid, and achieving the advantages of multi-stage purification. Attached Figure Description

[0018] Figure 1 This is a three-dimensional view of the structure of this utility model;

[0019] Figure 2 This is a three-dimensional cross-sectional view of the structure of this utility model;

[0020] Figure 3 This is a three-dimensional view of the conveying structure and stirring structure of this utility model;

[0021] Figure 4 This is a three-dimensional cross-sectional view of the conveying structure of this utility model.

[0022] In the diagram: 1. Reactor; 2. Sedimentation tank; 3. Filter box; 4. Inlet pipe; 5. Storage cylinder; 6. Connecting pipe; 7. Connecting cylinder; 8. Piston plate; 9. Transmission rod; 10. Transmission plate; 11. Return spring; 12. Extraction pipe; 13. Delivery pipe; 14. Motor base; 15. Dual-shaft motor; 16. Eccentric block; 17. Rotating sleeve; 18. Rotating rod; 19. Stirring shaft; 20. Transmission gear; 21. Driven gear; 22. Electric push rod; 23. Filter press plate; 24. Baffle; 25. Filter screen. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1 to 4 This embodiment of a multi-stage purification device based on oxalic acid treatment of tin stripping waste liquid includes a reaction vessel 1, a sedimentation tank 2 fixedly connected to the right side of the reaction vessel 1, a filter box 3 fixedly connected to the right side of the sedimentation tank 2, and an inlet pipe 4 fixedly connected to the top of the reaction vessel 1. The top of the reaction vessel 1 is provided with a conveying structure extending into its interior for controlling the addition of oxalic acid, and the top of the reaction vessel 1 is provided with a stirring structure extending into its interior for fully mixing oxalic acid and waste liquid.

[0025] The conveying structure includes a storage cylinder 5 and a connecting pipe 6 fixedly connected to the top of the reactor 1, a connecting cylinder 7 fixedly connected to the top of the connecting pipe 6, a piston plate 8 slidably connected inside the connecting cylinder 7, a transmission rod 9 fixedly connected to the top of the piston plate 8, a transmission plate 10 fixedly connected to the top of the transmission rod 9, a reset spring 11 located at the bottom of the transmission plate 10, and an eccentric block 16 located at the top of the transmission plate 10. When the dual-axis motor 15 is started by the controller, its right-end output shaft drives the eccentric block 16 to rotate. The eccentric block 16 pushes the transmission plate 10 and the transmission rod 9 downwards, thereby pushing the piston plate 8 downwards within the connecting cylinder 7, drawing oxalic acid from the storage cylinder 5 into the connecting pipe 6 through the extraction pipe 12. As the eccentric block 16 continues to rotate, the reset spring 11 pushes the transmission plate 10 and the transmission rod 9 upwards to reset, and the piston plate 8 moves upwards, pressing the oxalic acid from the connecting pipe 6 into the reactor 1 through the conveying pipe 13.

[0026] The return spring 11 is fixedly installed on the top of the transmission plate 10 and the connecting cylinder 7. The return spring 11 is connected around the outside of the transmission rod 9. The transmission rod 9 is slidably connected to the inside of the connecting cylinder 7 and extends to its upper surface.

[0027] Specifically, an extraction pipe 12 is fixedly connected between the connecting pipe 6 and the storage tank 5, and a delivery pipe 13 is fixedly connected between the connecting pipe 6 and the reaction vessel 1. One-way valve plates, arranged opposite each other, are rotatably installed on the left and right sides inside the connecting pipe 6. By installing one-way valve plates inside the connecting pipe 6, oxalic acid backflow is prevented, ensuring efficient and stable delivery.

[0028] In this embodiment, the stirring structure includes a rotating sleeve 17 rotatably connected inside the reactor 1, a rotating rod 18 fixedly installed inside the rotating sleeve 17, a stirring shaft 19 fixedly connected outside the rotating rod 18, and a transmission mechanism disposed on the top of the reactor 1. The transmission mechanism includes a motor base 14 fixedly connected to the top of the reactor 1, a dual-shaft motor 15 fixedly installed on the top of the motor base 14, a driven gear 21 fixedly installed outside the rotating sleeve 17, and a transmission gear 20 fixedly installed on the left output shaft of the dual-shaft motor 15.

[0029] Among them, the transmission gear 20 and the driven gear 21 are meshed with each other, and the eccentric block 16 is fixedly installed on the right output shaft of the dual-shaft motor 15.

[0030] Specifically, there are several stirring shafts 19, which are distributed at equal intervals outside the rotating rod 18. Both the stirring shafts 19 and the rotating rod 18 are rotatably connected to the inside of the reactor 1.

[0031] In this embodiment, an electric push rod 22 extending into the top of the settling tank 2 is fixedly installed. A filter press plate 23 is fixedly connected to the output end of the electric push rod 22. A baffle 24 is fixedly connected inside the settling tank 2 and on the lower surface of the filter press plate 23. When the mixed liquid flows into the settling tank 2, the electric push rod 22 is activated by the controller to push the filter press plate 23 down, accelerating the settling of tin precipitates. The baffle 24 prevents tin precipitates from flowing back, ensuring that the mixed liquid enters the next stage.

[0032] The filter box 3 has two slidably connected filter screens 25 inside. The filter box 3 has an opening inside that accommodates the filter screens 25, and a drain pipe is fixedly connected to the outside of the filter box 3. Through the step-by-step filtration by the two filter screens 25, impurities and fine particles in the waste liquid are effectively removed, ensuring purification efficiency. The filter screens 25 are slidably connected inside the filter box 3, facilitating disassembly and replacement, reducing maintenance costs. Through the multi-stage purification of the sedimentation tank 2 and the filter box 3, impurities in the waste liquid are gradually removed, effectively improving the treatment efficiency and tin recovery rate of the tin stripping waste liquid, while ensuring that the treated waste liquid meets discharge standards.

[0033] The working principle of the above embodiments is as follows:

[0034] In operation, waste liquid is introduced into reactor 1 through inlet pipe 4. The dual-shaft motor 15 is activated by the controller. The eccentric block 16 on its right output shaft, through the cooperation of transmission plate 10 and return spring 11, drives piston plate 8 to move up and down within connecting cylinder 7. The up-and-down movement of piston plate 8 is transmitted through transmission rod 9, achieving quantitative delivery of oxalic acid. Oxalic acid enters reactor 1 through delivery pipe 13 and mixes with the waste liquid. The transmission gear 20 on the left output shaft of the dual-shaft motor 15 meshes with driven gear 21, driving rotating sleeve 17 and rotating rod 18 to rotate. Rotating rod 18 drives stirring shaft 19 to rotate, ensuring thorough mixing of oxalic acid and waste liquid. The mixed waste liquid enters sedimentation tank 2. The controller activates electric push rod 22 to push filter plate 23 down, accelerating the settling of tin precipitate. The settled mixture enters filter box 3 through baffle 24. Two filter screens 25 in filter box 3 further filter the mixture. The filtered mixture is discharged through drain pipe, completing multi-stage purification.

[0035] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods. Any method that can achieve its beneficial effect can be implemented. In addition, the electrical components in this embodiment are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device such as a computer that plays a control role. Those skilled in the art can control the electrical components through simple programming. Moreover, the existing disclosed power connection technology is also common knowledge in the field. Therefore, the specific structural composition and working principle will not be described in detail in this embodiment.

Claims

1. A multi-stage purification device for treating tin stripping waste liquid with oxalic acid, characterized in that: The reactor includes a reaction vessel (1), a sedimentation tank (2) fixedly connected to the right side of the reaction vessel (1), a filter box (3) fixedly connected to the right side of the sedimentation tank (2), and an inlet pipe (4) fixedly connected to the top of the reaction vessel (1). The top of the reaction vessel (1) is provided with a conveying structure extending into its interior for controlling the addition of oxalic acid. The top of the reaction vessel (1) is provided with a stirring structure extending into its interior for fully mixing oxalic acid and waste liquid. The conveying structure includes a liquid storage cylinder (5) and a connecting pipe (6) fixedly connected to the top of the reactor (1), a connecting cylinder (7) fixedly connected to the top of the connecting pipe (6), a piston plate (8) slidably connected inside the connecting cylinder (7), a transmission rod (9) fixedly connected to the top of the piston plate (8), a transmission plate (10) fixedly connected to the top of the transmission rod (9), a reset spring (11) set at the bottom of the transmission plate (10), and an eccentric block (16) set at the top of the transmission plate (10). The stirring structure includes a rotating sleeve (17) rotatably connected inside the reactor (1), a rotating rod (18) fixedly installed inside the rotating sleeve (17), a stirring shaft (19) fixedly connected outside the rotating rod (18), and a transmission mechanism set on the top of the reactor (1).

2. The multi-stage purification device for treating tin stripping waste liquid based on oxalic acid according to claim 1, characterized in that: The return spring (11) is fixedly installed on the top of the transmission plate (10) and the connecting cylinder (7). The return spring (11) is connected around the outside of the transmission rod (9). The transmission rod (9) is slidably connected to the inside of the connecting cylinder (7) and extends to its upper surface.

3. The multi-stage purification device for treating tin stripping waste liquid based on oxalic acid according to claim 1, characterized in that: An extraction pipe (12) is fixedly connected between the connecting pipe (6) and the liquid storage cylinder (5), and a delivery pipe (13) is fixedly connected between the connecting pipe (6) and the reaction vessel (1). One-way valve plates are rotatably installed on the left and right sides inside the connecting pipe (6) and are arranged opposite to each other.

4. The multi-stage purification device for treating tin stripping waste liquid based on oxalic acid according to claim 1, characterized in that: The transmission mechanism includes a motor base (14) fixedly connected to the top of the reactor (1), a dual-shaft motor (15) fixedly installed on the top of the motor base (14), a driven gear (21) fixedly installed on the outside of the rotating sleeve (17), and a transmission gear (20) fixedly installed on the output shaft at the left end of the dual-shaft motor (15).

5. The multi-stage purification device for treating tin stripping waste liquid based on oxalic acid according to claim 1, characterized in that: The transmission gear (20) and the driven gear (21) mesh with each other, and the eccentric block (16) is fixedly installed on the right output shaft of the dual-shaft motor (15).

6. The multi-stage purification device for treating tin stripping waste liquid based on oxalic acid according to claim 1, characterized in that: The number of stirring shafts (19) is several, and the several stirring shafts (19) are distributed at equal intervals outside the rotating rod (18). The several stirring shafts (19) and the rotating rod (18) are rotatably connected to the inside of the reactor (1).

7. The multi-stage purification device for treating tin stripping waste liquid based on oxalic acid according to claim 1, characterized in that: An electric push rod (22) extending into the top of the sedimentation tank (2) is fixedly installed. A filter plate (23) is fixedly connected to the output end of the electric push rod (22). A baffle (24) is fixedly connected inside the sedimentation tank (2) and on the lower surface of the filter plate (23).

8. The multi-stage purification device for treating tin stripping waste liquid based on oxalic acid according to claim 1, characterized in that: The filter box (3) has two filter screens (25) slidably connected inside. The filter box (3) has a retrieval port that matches the filter screens (25) inside. The filter box (3) is fixedly connected to the outside of the filter box (3) by a drain pipe.

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