Step recovery device and method for waste liquid for bolt electroplating

Abstract

The invention discloses a bolt electroplating waste liquid stepped recovery device and method, and relates to the technical field of bolt electroplating waste liquid recovery, the bolt electroplating waste liquid stepped recovery device comprises a liquid storage frame, the upper surface of the liquid storage frame is provided with a first recovery frame, a second recovery frame and a third recovery frame, and the upper surface of the first recovery frame is provided with a detachable blocking assembly; and a third liquid discharging pipe extending to an inner cavity of the second recycling frame is installed at the upper end of the outer wall of one side of the first recycling frame, an overflow assembly extending to the inner cavity of the second recycling frame is installed on the upper surface of the second recycling frame, and a second liquid discharging pipe is installed at the upper end of the outer wall of one side of the second recycling frame. When the method is used, the hydrogen peroxide solution is used for oxidizing cyanide in the bolt electroplating waste liquid into nitrogen and water, the cyanide in the bolt electroplating waste liquid is removed, the saturated calcium hydroxide solution is poured, heavy metal ions in the bolt electroplating waste liquid generate water-insoluble precipitates, and therefore the heavy metal ions in the bolt electroplating waste liquid are removed.

Description

Technical Field

[0001] The present invention relates to the technical field of bolt electroplating waste liquid recovery, and in particular to a bolt electroplating waste liquid step recovery device and method. Background Art

[0002] A large number of bolt components are used in high-speed railway tracks. In order to improve the anti-corrosion effect of the bolt components, it is often necessary to electroplate the outer surface of the bolts to form an anti-corrosion coating. The electroplating waste liquid generated in the electroplating operation contains harmful substances such as heavy metal ions and cyanide. The Chinese utility model patent document with announcement number: CN208517149U discloses an electroplating waste liquid recovery device, including a device body, a base is installed at the bottom of the device body, a sedimentation tank is installed on the upper left side of the base, a waste liquid discharge pipe is arranged on the top left side of the sedimentation tank, a liquid receiving chamber is arranged on the upper middle of the base, a liquid receiving chamber outlet pipe is arranged on the right side of the liquid receiving chamber, a quartz sand filter layer is installed above the liquid receiving chamber, a neutralization and stirring bin is installed above the quartz sand filter layer, a stirring bin liquid inlet pipe is arranged on the upper left side of the neutralization and stirring bin, and a neutralization liquid inlet is installed on the top right side of the neutralization and stirring bin.

[0003] Although the above-mentioned electroplating waste liquid recovery device can remove heavy metal ions, the removal rate is low, and it is unable to remove cyanide in the electroplating waste liquid, resulting in incomplete treatment of the electroplating waste liquid. For this reason, the present application proposes a step-by-step recovery device for bolt electroplating waste liquid that is different from the prior art to solve the above-mentioned technical problems. Summary of the invention

[0004] In order to improve the above-mentioned problem of low removal rate of heavy metal ions and inability to remove cyanide in electroplating waste liquid, the present invention provides a step-by-step recovery device and method for bolt electroplating waste liquid.

[0005] The present invention provides a step-by-step recovery device and method for waste liquid used in bolt electroplating, which adopts the following technical scheme:

[0006] A step-by-step recovery device for waste liquid for bolt electroplating, comprising a liquid storage frame, a first recovery frame, a second recovery frame and a third recovery frame are respectively installed on the upper surface of the liquid storage frame, a detachable retaining assembly is arranged on the upper surface of the first recovery frame, a third liquid discharge pipe extending to the inner cavity of the second recovery frame is installed at the upper end position of the outer wall of one side of the first recovery frame, an overflow assembly extending to the inner cavity of the second recovery frame is installed on the upper surface of the second recovery frame, a second liquid discharge pipe is installed at the upper end position of the outer wall of one side of the second recovery frame, an adsorption filter assembly is installed at the upper end position of the inner cavity of the third recovery frame, and a water injection hole connected with the third recovery frame is opened at one end of the upper surface of the liquid storage frame.

[0007] Optionally, the blocking assembly includes a screen filter frame, which is movably arranged on the upper surface of the first recovery frame, and a protective ring in contact with the upper surface of the first recovery frame is installed on the top of the outer wall of the screen filter frame.

[0008] Optionally, the overflow assembly includes a cylinder, which is fixed at a middle position on the upper surface of the second recovery frame, and the end of the cylinder output shaft extends into the inner cavity of the second recovery frame and is fixed with a connecting plate, and multiple groups of overflow plates are evenly fixed on the outside of the connecting plate.

[0009] Optionally, the adsorption filtration assembly includes pads, which are provided in two groups. The two groups of pads are respectively installed on the inner walls of the third recovery frame, and an installation frame is provided on the upper surface of the two groups of pads. A microfiltration membrane is fixed at the middle position of the inner wall of the installation frame, and activated carbon plates are installed at the upper and lower ends of the inner wall of the installation frame.

[0010] Optionally, a driving motor is installed at a middle position of the upper surface of the first recovery frame, and a rotating shaft extending into the inner cavity of the first recovery frame is installed at the output end of the driving motor, and a plurality of groups of blades are installed on the outside of the rotating shaft.

[0011] Optionally, a second mud discharge pipe extending into the inner cavity of the first recovery frame is installed at the bottom end of the outer wall of one side of the second recovery frame, and a first mud discharge pipe is installed at the bottom end of the outer wall of one side of the first recovery frame.

[0012] Optionally, a first liquid drain pipe is installed at the bottom end of the outer wall of one side of the liquid storage frame.

[0013] Optionally, a submersible pump is installed at one end of the bottom wall of the inner cavity of the liquid storage frame, and a water injection pipe extending to the upper end of the inner cavity of the second recovery frame is installed at the output end of the submersible pump.

[0014] Optionally, a liquid level window is installed at one end of the front side wall of the liquid storage frame.

[0015] A stepwise recovery method for bolt electroplating waste liquid comprises the following steps:

[0016] S1: placing the liquid storage frame at an appropriate position, inserting the screen filter frame and the protection ring from top to bottom into the inner cavity of the first recovery frame and stably placing them on the upper surface of the first recovery frame, injecting the bolt electroplating waste liquid into the inner cavity of the first recovery frame through the top opening of the screen filter frame, and automatically filtering and blocking large-volume debris in the bolt electroplating waste liquid under the mesh structure of the screen filter frame;

[0017] S2: After step S1, pour an appropriate amount of hydrogen peroxide solution into the inner cavity of the first recovery frame through the top opening of the mesh filter frame to fully mix it with the bolt electroplating waste liquid, and use the strong oxidizing property of the hydrogen peroxide solution to oxidize the cyanide in the bolt electroplating waste liquid into nitrogen and water, thereby removing the cyanide in the bolt electroplating waste liquid to prevent it from polluting the environment;

[0018] S3: After step S2, pour a saturated calcium hydroxide solution into the inner cavity of the first recovery frame through the top opening of the mesh filter frame, so that the heavy metal ions in the bolt electroplating waste liquid can react with the calcium hydroxide solution to generate a water-insoluble precipitate, thereby removing the heavy metal ions in the bolt electroplating waste liquid;

[0019] S4: After steps S1-S3, the sediment in the lower layer of the bolt electroplating waste liquid is automatically accumulated at the bottom position of the inner cavity of the first recovery frame, and the clear liquid in the upper layer of the bolt electroplating waste liquid can be automatically transferred to the inner cavity of the second recovery frame through the third liquid discharge pipe. Under the action of multiple groups of overflow plates, the space inside the first recovery frame can be divided into several parts, so that the clear liquid in the upper layer of the bolt electroplating waste liquid can be gradually injected into the inner cavity of the third recovery frame through the second liquid discharge pipe during the flow process, and the fine debris mixed in the bolt electroplating waste liquid can be gradually deposited to the bottom position of the inner cavity of the second recovery frame during the flow process;

[0020] S5: After step S4, the installation frame is first placed in the inner cavity of the third recovery frame and its bottom is in contact with the upper surfaces of the two groups of pads. The activated carbon plate can automatically absorb and remove fine debris in the bolt electroplating waste liquid, and the microfiltration membrane can automatically intercept tiny debris.

[0021] S6: After steps S1-S5, the bolt electroplating waste liquid after the stepwise recovery and removal of debris can be automatically injected into the inner cavity of the liquid storage frame through the water injection hole for storage, and the liquid level window allows the staff to check the liquid level height of the inner cavity of the liquid storage frame in real time;

[0022] S7: Open the control valve on the first liquid discharge pipe to discharge the water in the liquid storage frame;

[0023] S8: After using for a period of time, lift the installation frame upward to separate it from the third recovery frame, flip it 180 degrees and place it back in the inner cavity of the third recovery frame, so that the activated carbon plates on the upper and lower sides are exchanged with each other, so that the activated carbon plates can be replaced when the amount of debris adsorbed by the activated carbon plates is too much;

[0024] S9: When performing steps S2-S3, the driving motor is started to drive the rotating shaft to rotate, thereby driving the multiple sets of blades to rotate synchronously, thereby accelerating the bolt electroplating waste liquid in the inner cavity of the first recovery frame to be fully mixed with the hydrogen peroxide solution and the saturated calcium hydroxide solution, thereby improving the waste removal rate of the bolt electroplating waste liquid and further improving the step recovery effect;

[0025] S10: After steps S1-S9, the cylinder is started to contract so as to drive the connecting plate and the overflow plate to move upward synchronously until the bottom of the multiple overflow plates are separated from the bottom wall of the inner cavity of the second recovery frame, the submersible pump is started to extract the water in the inner cavity of the liquid storage frame and inject it into the inner cavity of the second recovery frame through the water injection pipe, and the control valve on the second mud discharge pipe is opened. With the help of the flushing effect of the water body, the sediment deposited on the bottom wall of the inner cavity of the second recovery frame can be transferred to the inner cavity of the first recovery frame through the second mud discharge pipe;

[0026] S11: After step S10, the driving motor is started to drive the rotating shaft and the blades to rotate synchronously, and the control valve on the first mud discharge pipe is opened, so that the sediment in the inner cavity of the first recovery frame can be discharged through the first mud discharge pipe along with the water.

[0027] In summary, the present invention includes at least one of the following beneficial effects:

[0028] The bolt electroplating waste liquid can automatically filter and block large-volume impurities in the bolt electroplating waste liquid under the action of the mesh structure of the filter frame, and utilize the strong oxidizing property of the hydrogen peroxide solution to oxidize the cyanide in the bolt electroplating waste liquid into nitrogen and water, thereby removing the cyanide in the bolt electroplating waste liquid to avoid its pollution of the environment, and pouring in a saturated calcium hydroxide solution so that the heavy metal ions in the bolt electroplating waste liquid can react with the calcium hydroxide solution to form a water-insoluble precipitate, thereby removing the heavy metal ions in the bolt electroplating waste liquid.

[0029] Under the action of multiple groups of overflow plates, the space inside the first recovery frame can be divided into several parts, so that the clear liquid on the upper layer of the bolt electroplating waste liquid can be gradually injected into the inner cavity of the third recovery frame through the second drain pipe during the flow process, and the fine debris mixed in the bolt electroplating waste liquid can gradually settle to the bottom position of the inner cavity of the second recovery frame during the flow process. Under the action of the activated carbon plate, the fine debris in the bolt electroplating waste liquid can be automatically adsorbed and removed, and under the action of the microfiltration membrane, the tiny debris can be automatically intercepted, which is convenient for the step-by-step removal of debris in the bolt electroplating waste liquid and improves the step-by-step recovery effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a front view cross-sectional structural schematic diagram of the present invention;

[0031] Figure 2 It is a schematic diagram of a top view and a cross-sectional structure of a second recycling frame of the present invention;

[0032] Figure 3 It is a schematic diagram of a top view and a cross-sectional structure of a third recycling frame of the present invention;

[0033] Figure 4 It is a front view structural schematic diagram of the present invention.

[0034] In the figure: 1. protective ring; 2. rotating shaft; 3. paddle; 4. first mud discharge pipe; 5. first liquid discharge pipe; 6. first recovery frame; 7. second mud discharge pipe; 8. second recovery frame; 9. water injection pipe; 10. submersible pump; 11. water injection hole; 12. third recovery frame; 13. cushion strip; 14. installation frame; 15. microfiltration membrane; 16. activated carbon plate; 17. second liquid discharge pipe; 18. overflow plate; 19. cylinder; 20. connecting plate; 21. third liquid discharge pipe; 22. driving motor; 23. screen filter frame; 24. liquid level window; 25. liquid storage frame. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-4 The present invention is described in further detail.

[0036] Please refer to the attached figure in the instruction manual Figure 1 A step-by-step recovery device for waste liquid for bolt electroplating comprises a liquid storage frame 25, on the upper surface of which a first recovery frame 6, a second recovery frame 8 and a third recovery frame 12 are respectively installed, and the first recovery frame 6 and the liquid storage frame 25 partially overlap, and the overlapping area is 70%-90% of the cross-sectional area of ​​the first recovery frame 6, the second recovery frame 8 is arranged between the first recovery frame 6 and the third recovery frame 12 through a pad, and a detachable blocking component is arranged on the upper surface of the first recovery frame 6, the blocking component comprises a mesh filter frame 23, the mesh filter frame 23 is movably arranged on the upper surface of the first recovery frame 6, the upper surface of the mesh filter frame 23 is arranged to be open, and a protective ring 1 in contact with the upper surface of the first recovery frame 6 is installed on the top of the outer wall of the mesh filter frame 23.

[0037] Please refer to the attached figure in the instruction manual Figure 1 and 2 A third liquid discharge pipe 21 extending to the inner cavity of the second recovery frame 8 is installed at the upper end of the outer wall on one side of the first recovery frame 6, and an overflow assembly is installed on the upper surface of the second recovery frame 8. The overflow assembly includes a cylinder 19, and the cylinder 19 is fixed at the middle position of the upper surface of the second recovery frame 8. The end of the output shaft of the cylinder 19 extends to the inner cavity of the second recovery frame 8 and is fixed with a connecting plate 20. A plurality of groups of overflow plates 18 are evenly fixed on the outside of the connecting plate 20. The lateral length of the plurality of groups of overflow plates 18 is equal to the lateral length of the inner cavity of the second recovery frame 8, and there is a gap between the upper surface of the overflow plate 18 and the upper surface of the inner cavity of the second recovery frame 8.

[0038] Please refer to the attached figure in the instruction manual Figure 1 and 3A second liquid discharge pipe 17 is installed at the upper end of the outer wall of one side of the second recovery frame 8, the upper surface of the third recovery frame 12 is set to be open, and an adsorption filtration component is installed at the upper end of the inner cavity of the third recovery frame 12, and the adsorption filtration component includes a pad 13, and two groups of pads 13 are provided. The two groups of pads 13 are respectively installed on the inner wall of the third recovery frame 12, and a mounting frame 14 is provided on the upper surface of the two groups of pads 13. A microfiltration membrane 15 is fixed at the middle position of the inner wall of the mounting frame 14, and activated carbon plates 16 are installed at the upper and lower ends of the inner wall of the mounting frame 14. A water injection hole 11 connected to the third recovery frame 12 is opened at one end of the upper surface of the liquid storage frame 25.

[0039] Please refer to the attached figure in the instruction manual Figure 1 A driving motor 22 is installed at the middle position of the upper surface of the first recovery frame 6, and a rotating shaft 2 extending into the inner cavity of the first recovery frame 6 is installed at the output end of the driving motor 22. Multiple groups of blades 3 are installed on the outside of the rotating shaft 2, and the multiple groups of blades 3 are arranged at the lower end position of the inner cavity of the first recovery frame 6.

[0040] Please refer to the attached figure in the instruction manual Figure 1 and 4 A second mud discharge pipe 7 extending into the inner cavity of the first recovery frame 6 is installed at the bottom end of the outer wall on one side of the second recovery frame 8, and a control valve is installed on the outside of the second mud discharge pipe 7. A first mud discharge pipe 4 is installed at the bottom end of the outer wall on one side of the first recovery frame 6, and a control valve is installed on the outside of the first mud discharge pipe 4.

[0041] Please refer to the attached figure in the instruction manual Figure 1 and 4 A first liquid discharge pipe 5 is installed at the bottom end of the outer wall of one side of the liquid storage frame 25, and a control valve is installed outside the first liquid discharge pipe 5.

[0042] Please refer to the attached figure in the instruction manual Figure 1 and 4 A submersible pump 10 is installed at one end of the bottom wall of the inner cavity of the liquid storage frame 25, and a water injection pipe 9 extending to the upper end of the inner cavity of the second recovery frame 8 is installed at the output end of the submersible pump 10. The water injection pipe 9 is arranged between the second recovery frame 8 and the third recovery frame 12.

[0043] Please refer to the attached figure in the instruction manual Figure 4 A liquid level window 24 is installed at one end of the front side wall of the liquid storage frame 25.

[0044] A stepwise recovery method for bolt electroplating waste liquid comprises the following steps:

[0045] S1: Place the liquid storage frame 25 at an appropriate position, insert the screen filter frame 23 and the protection ring 1 from top to bottom into the inner cavity of the first recovery frame 6 and stably place them on the upper surface of the first recovery frame 6, and inject the bolt electroplating waste liquid into the inner cavity of the first recovery frame 6 through the top opening of the screen filter frame 23. Under the action of the mesh structure of the screen filter frame 23, large-volume debris in the bolt electroplating waste liquid can be automatically filtered and intercepted;

[0046] S2: After step S1, pour an appropriate amount of hydrogen peroxide solution into the inner cavity of the first recovery frame 6 through the top opening of the mesh filter frame 23 to fully mix it with the bolt electroplating waste liquid, and use the strong oxidizing property of the hydrogen peroxide solution to oxidize the cyanide in the bolt electroplating waste liquid into nitrogen and water, thereby removing the cyanide in the bolt electroplating waste liquid to prevent it from polluting the environment;

[0047] S3: After step S2, pour a saturated calcium hydroxide solution into the inner cavity of the first recovery frame 6 through the top opening of the mesh filter frame 23, so that the heavy metal ions in the bolt electroplating waste liquid can react with the calcium hydroxide solution to generate a water-insoluble precipitate, thereby removing the heavy metal ions in the bolt electroplating waste liquid;

[0048] S4: After steps S1-S3, the sediment in the lower layer of the bolt electroplating waste liquid is automatically accumulated at the bottom position of the inner cavity of the first recovery frame 6, and the clear liquid in the upper layer of the bolt electroplating waste liquid can be automatically transferred to the inner cavity of the second recovery frame 8 through the third drainage pipe 21. Under the action of multiple groups of overflow plates 18, the space inside the first recovery frame 6 can be divided into several parts, so that the clear liquid in the upper layer of the bolt electroplating waste liquid can be gradually injected into the inner cavity of the third recovery frame 12 through the second drainage pipe 17 during the flow process, and the fine debris mixed in the bolt electroplating waste liquid can be gradually deposited to the bottom position of the inner cavity of the second recovery frame 8 during the flow process;

[0049] S5: After step S4, the installation frame 14 is first placed in the inner cavity of the third recovery frame 12 and its bottom is in contact with the upper surface of the two groups of pads 13. The activated carbon plate 16 can automatically absorb and remove fine debris in the bolt electroplating waste liquid, and the microfiltration membrane 15 can automatically intercept tiny debris;

[0050] S6: After steps S1-S5, the bolt electroplating waste liquid after the stepwise recovery and removal of debris can be automatically injected into the inner cavity of the liquid storage frame 25 through the water injection hole 11 for storage, and the liquid level window 24 facilitates the staff to check the liquid level height of the inner cavity of the liquid storage frame 25 in real time;

[0051] S7: Open the control valve on the first liquid discharge pipe 5 to discharge the water in the inner cavity of the liquid storage frame 25;

[0052] S8: After using for a period of time, lift the installation frame 14 upward to separate it from the third recovery frame 12, flip it 180 degrees and place it back in the inner cavity of the third recovery frame 12, so that the activated carbon plates 16 on the upper and lower sides are exchanged with each other, so that the activated carbon plates 16 can be replaced when the amount of debris adsorbed by them is too much;

[0053] S9: When performing steps S2-S3, the driving motor 22 is started to drive the rotating shaft 2 to rotate, thereby driving the multiple groups of blades 3 to rotate synchronously, thereby accelerating the bolt electroplating waste liquid in the inner cavity of the first recovery frame 6 to be fully mixed with the hydrogen peroxide solution and the saturated calcium hydroxide solution, thereby improving the waste removal rate of the bolt electroplating waste liquid and further improving the step recovery effect;

[0054] S10: After steps S1-S9, the air cylinder 19 is started to contract so as to drive the connecting plate 20 and the overflow plate 18 to move upward synchronously until the bottom of the plurality of overflow plates 18 is separated from the bottom wall of the inner cavity of the second recovery frame 8, the submersible pump 10 is started to extract the water in the inner cavity of the liquid storage frame 25 and inject it into the inner cavity of the second recovery frame 8 through the water injection pipe 9, and the control valve on the second mud discharge pipe 7 is opened. With the help of the flushing effect of the water body, the sediment deposited on the bottom wall of the inner cavity of the second recovery frame 8 can be transferred to the inner cavity of the first recovery frame 6 through the second mud discharge pipe 7;

[0055] S11: After step S10, the driving motor 22 is started to drive the rotating shaft 2 and the blade 3 to rotate synchronously, and the control valve on the first mud discharge pipe 4 is opened, so that the sediment in the inner cavity of the first recovery frame 6 can be discharged through the first mud discharge pipe 4 along with the water.

[0056] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A step-by-step recovery device for waste liquid used in bolt electroplating, comprising a liquid storage frame (25), characterized in that: A first recovery frame (6), a second recovery frame (8) and a third recovery frame (12) are respectively installed on the upper surface of the liquid storage frame (25); a detachable blocking component is arranged on the upper surface of the first recovery frame (6); a third liquid discharge pipe (21) extending to the inner cavity of the second recovery frame (8) is installed at the upper end position of the outer wall of one side of the first recovery frame (6); an overflow component extending to the inner cavity of the second recovery frame (8) is installed on the upper surface of the second recovery frame (8); a second liquid discharge pipe (17) is installed at the upper end position of the outer wall of one side of the second recovery frame (8); an adsorption filter component is installed at the upper end position of the inner cavity of the third recovery frame (12); and a water injection hole (11) is opened at one end of the upper surface of the liquid storage frame (25) and is interconnected with the third recovery frame (12).

2. A stepwise recovery device for waste liquid used for bolt electroplating according to claim 1, characterized in that: The blocking component comprises a screen frame (23), the screen frame (23) being movably arranged on the upper surface of the first recovery frame (6), and a protective ring (1) in contact with the upper surface of the first recovery frame (6) being installed on the top of the outer wall of the screen frame (23).

3. A stepwise recovery device for waste liquid used for bolt electroplating according to claim 1, characterized in that: The overflow assembly comprises a cylinder (19), the cylinder (19) being fixed at a middle position on the upper surface of the second recovery frame (8), the output shaft end of the cylinder (19) extending into the inner cavity of the second recovery frame (8) and being fixed with a connecting plate (20), and a plurality of overflow plates (18) being evenly fixed on the outside of the connecting plate (20).

4. A stepwise recovery device for waste liquid used for bolt electroplating according to claim 1, characterized in that: The adsorption filtration assembly comprises a pad strip (13), wherein two groups of the pad strip (13) are provided, and the two groups of the pad strips (13) are respectively installed on the inner wall of the third recovery frame (12), and an installation frame (14) is provided on the upper surface of the two groups of the pad strips (13), a microfiltration membrane (15) is fixed at the middle position of the inner wall of the installation frame (14), and activated carbon plates (16) are installed at the upper and lower ends of the inner wall of the installation frame (14).

5. The stepwise recovery device for waste liquid used for bolt electroplating according to claim 1 is characterized in that: A driving motor (22) is installed at a middle position on the upper surface of the first recovery frame (6), and a rotating shaft (2) extending into the inner cavity of the first recovery frame (6) is installed at the output end of the driving motor (22), and a plurality of groups of blades (3) are installed outside the rotating shaft (2).

6. A stepwise recovery device for waste liquid used for bolt electroplating according to claim 1, characterized in that: A second mud discharge pipe (7) extending into the inner cavity of the first recovery frame (6) is installed at the bottom end of the outer wall of one side of the second recovery frame (8), and a first mud discharge pipe (4) is installed at the bottom end of the outer wall of one side of the first recovery frame (6).

7. The stepwise recovery device for bolt electroplating waste liquid according to claim 1, characterized in that: A first liquid discharge pipe (5) is installed at the bottom end of the outer wall of one side of the liquid storage frame (25).

8. The stepwise recovery device for bolt electroplating waste liquid according to claim 1, characterized in that: A submersible pump (10) is installed at one end of the bottom wall of the inner cavity of the liquid storage frame (25), and a water injection pipe (9) extending to the upper end of the inner cavity of the second recovery frame (8) is installed at the output end of the submersible pump (10).

9. The stepwise recovery device for bolt electroplating waste liquid according to claim 1, characterized in that: A liquid level window (24) is installed at one end of the front side wall of the liquid storage frame (25).

10. A stepwise recovery method for waste liquid used in bolt electroplating, characterized in that: The following steps are involved: S1: placing the liquid storage frame (25) at an appropriate position, inserting the screen filter frame (23) and the protection ring (1) from top to bottom into the inner cavity of the first recovery frame (6) and stably placing them on the upper surface of the first recovery frame (6), injecting the bolt electroplating waste liquid into the inner cavity of the first recovery frame (6) through the top opening of the screen filter frame (23), and automatically filtering and blocking large-volume debris in the bolt electroplating waste liquid under the action of the mesh structure of the screen filter frame (23); S2: After step S1, pour an appropriate amount of hydrogen peroxide solution into the inner cavity of the first recovery frame (6) through the top opening of the mesh filter frame (23) to fully mix the hydrogen peroxide solution with the bolt electroplating waste liquid, and utilize the strong oxidizing property of the hydrogen peroxide solution to oxidize the cyanide in the bolt electroplating waste liquid into nitrogen and water, thereby removing the cyanide in the bolt electroplating waste liquid and preventing it from polluting the environment; S3: After step S2, pour a saturated calcium hydroxide solution into the inner cavity of the first recovery frame (6) through the top opening of the mesh filter frame (23), so that the heavy metal ions in the bolt electroplating waste liquid can react with the calcium hydroxide solution to generate a water-insoluble precipitate, thereby removing the heavy metal ions in the bolt electroplating waste liquid; S4: After steps S1-S3, the sediment in the lower layer of the bolt electroplating waste liquid is automatically accumulated at the bottom position of the inner cavity of the first recovery frame (6), and the clear liquid in the upper layer of the bolt electroplating waste liquid can be automatically transferred to the inner cavity of the second recovery frame (8) through the third drainage pipe (21). Under the action of multiple groups of overflow plates (18), the space inside the first recovery frame (6) can be divided into several parts, so that the clear liquid in the upper layer of the bolt electroplating waste liquid can be gradually injected into the inner cavity of the third recovery frame (12) through the second drainage pipe (17) during the flow process, and the fine debris mixed in the bolt electroplating waste liquid can be gradually deposited to the bottom position of the inner cavity of the second recovery frame (8) during the flow process; S5: After step S4, the installation frame (14) is first placed in the inner cavity of the third recovery frame (12) and its bottom is in contact with the upper surface of the two groups of pads (13). Under the action of the activated carbon plate (16), fine impurities in the bolt electroplating waste liquid can be automatically adsorbed and removed, and under the action of the microfiltration membrane (15), tiny impurities can be automatically intercepted; S6: After steps S1-S5, the bolt electroplating waste liquid after the stepwise recovery and removal of impurities can be automatically injected into the inner cavity of the liquid storage frame (25) through the water injection hole (11) for storage, and the liquid level window (24) allows the staff to check the liquid level height of the inner cavity of the liquid storage frame (25) in real time; S7: Open the control valve on the first liquid discharge pipe (5) to discharge the water in the inner cavity of the liquid storage frame (25); S8: After a period of use, the installation frame (14) is lifted upward to separate it from the third recovery frame (12), and then flipped 180 degrees and placed back into the inner cavity of the third recovery frame (12), so that the activated carbon plates (16) located on the upper and lower sides are exchanged with each other, so that the activated carbon plates (16) can be replaced when the amount of debris adsorbed by the activated carbon plates (16) is too much; S9: When performing steps S2-S3, the driving motor (22) is started to drive the rotating shaft (2) to rotate, thereby driving the multiple groups of blades (3) to rotate synchronously, thereby accelerating the bolt electroplating waste liquid in the inner cavity of the first recovery frame (6) to be fully mixed with the hydrogen peroxide solution and the saturated calcium hydroxide solution, thereby improving the waste removal rate of the bolt electroplating waste liquid and further improving the step recovery effect; S10: After steps S1-S9, the cylinder (19) is started to contract so as to drive the connecting plate (20) and the overflow plate (18) to move upward synchronously until the bottom of the plurality of overflow plates (18) is separated from the bottom wall of the inner cavity of the second recovery frame (8), the submersible pump (10) is started to extract water from the inner cavity of the liquid storage frame (25) and inject it into the inner cavity of the second recovery frame (8) through the water injection pipe (9), and the control valve on the second mud discharge pipe (7) is opened. With the help of the flushing effect of the water, the sediment deposited on the bottom wall of the inner cavity of the second recovery frame (8) can be transferred to the inner cavity of the first recovery frame (6) through the second mud discharge pipe (7); S11: After step S10, the driving motor (22) is started to drive the rotating shaft (2) and the paddle (3) to rotate synchronously, and the control valve on the first mud discharge pipe (4) is opened, so that the sediment in the inner cavity of the first recovery frame (6) can be discharged through the first mud discharge pipe (4) along with the water.

Images