A PCB micro-etching waste liquid recovery device based on niobium-based BDD electrodes

Abstract

The present invention relates to the technical field of waste liquid treatment, and in particular proposes a PCB micro-etching waste liquid recovery device based on niobium-based BDD electrodes. It includes a processing chamber, a mounting frame is fixedly connected to one side of the processing chamber, the mounting frame is rotatably connected to a first rotating shaft, the first rotating shaft is fixedly connected to a first fixed shell evenly distributed in the circumference, the first fixed shell is slidably connected to a first sliding rod, the first sliding rod is slidably connected to a sliding shell, a tension spring is arranged between the sliding shell and the adjacent first fixed shell, the sliding shell is rotatably and detachably installed with a cathode plate, an anode plate is installed on the side of the processing chamber away from the mounting frame, and both the cathode plate and the anode plate are made of niobium-based BDD material. The present invention provides circumferentially evenly distributed cathode plates, and when the copper attached to the surface of the cathode plate in use reaches a certain level, the cathode plate is replaced to ensure the continuous electrolysis and improve the rate of waste liquid recovery.

Description

Technical Field

[0001] The present invention relates to the technical field of waste liquid treatment, and specifically proposes a PCB micro-etching waste liquid recovery device based on a niobium-based BDD electrode. Background Art

[0002] A variety of chemicals are used in the manufacturing process of PCB (printed circuit board), among which micro-etching is a key step. Micro-etching is usually performed before browning or blackening treatment in order to increase the roughness of the copper surface and thus increase the bonding strength. The chemicals used in the micro-etching process mainly include acidic or alkaline etching solutions, which can selectively remove a thin layer of copper on the copper surface to produce a rougher surface. However, this process will produce waste liquid containing copper ions and other harmful chemicals. If these waste liquids are discharged without proper treatment, they will cause serious pollution to the environment, and the copper in the waste liquid will also be wasted.

[0003] Niobium-based BDD electrode is an electrode based on boron-doped diamond material, and its substrate uses niobium as the supporting material. BDD electrode has shown significant advantages in many application fields due to its unique electrochemical properties. Niobium-based BDD electrode combines the excellent physical properties of niobium and the electrochemical stability of BDD, making it have high chemical stability, high electrochemical activity, high conductivity and high mechanical strength.

[0004] Electrolysis is often used to treat PCB micro-etching waste liquid (hereinafter referred to as waste liquid). Through electrolysis, copper ions in the waste liquid are attached and aggregated on the cathode surface, so as to complete the recovery of copper in the waste liquid. During the electrolysis reaction, as copper attaches and aggregates on the cathode surface, copper shields the active sites on the BDD electrode surface, which will affect the rate of the electrolysis reaction and cause an increase in side reactions, affecting the recovery of copper. Therefore, when the copper on the cathode surface adheres to a certain extent, the copper on the cathode surface needs to be cleaned. However, the existing device needs to stop the reaction and then remove the cathode for cleaning. This method reduces the efficiency of waste liquid recovery. Summary of the invention

[0005] In order to overcome the shortcomings mentioned in the above background technology, the present invention provides a PCB micro-etching waste liquid recovery device based on a niobium-based BDD electrode.

[0006] The technical solution of the present invention is: a PCB micro-etching waste liquid recovery device based on niobium-based BDD electrode, comprising a processing chamber, a mounting frame fixedly connected to one side of the processing chamber, the mounting frame rotatably connected to a first rotating shaft, the first rotating shaft fixedly connected to a first fixed shell evenly distributed in the circumferential direction, the first fixed shell slidably connected to a first sliding rod on a side away from the first rotating shaft, the first sliding rod slidably connected to a sliding shell on a side away from the first rotating shaft, a tension spring is arranged between the sliding shell and the adjacent first fixed shell, a cathode plate is rotatably and detachably installed on the sliding shell, an anode plate is installed on the side of the processing chamber away from the mounting frame, the cathode plate and the anode plate are both made of niobium-based BDD material, the anode plate is connected to the positive pole of a power supply, the sliding shell is connected to a wire, the first rotating shaft is fixedly connected to a rotating ring, the circumferentially evenly distributed wires are all connected to the rotating ring, the mounting frame is fixedly connected to a fixed ring, the fixed ring is rotatably connected to the rotating ring, the sliding shell, the fixed ring and the rotating ring are all made of conductive materials, and the fixed ring is connected to the negative pole of the power supply.

[0007] Preferably, the wire is wound around the adjacent first sliding rod, and the first sliding rod and the sliding shell are both made of magnetic material.

[0008] Preferably, the motor is installed on a side of the outside of the processing chamber close to the mounting frame through a fixing frame, the output shaft of the motor is fixedly connected to the first transmission wheel, the mounting frame is slidably connected to the first gear box, the input shaft of the first gear box is fixedly connected to the second transmission wheel, the second transmission wheel is in transmission cooperation with the first transmission wheel, the output shaft of the first gear box is fixedly connected to the second sliding rod, the mounting frame is fixedly connected to the second gear box, the output shaft of the second gear box is fixedly connected to the first rotating shaft, the input shaft of the second gear box is fixedly connected to the second fixed shell, and the second fixed shell is spline-connected to the second sliding rod.

[0009] Preferably, a spring is arranged between the second fixed shell and the second sliding rod, the second sliding rod is slidably connected with a first limiting column, a spring is arranged between the first limiting column and the second sliding rod, the second fixed shell is slidably connected with an unlocking column passing through the first limiting column, the unlocking column is extruded and fitted with the first limiting column, the second fixed shell is provided with a locking groove, the first limiting column is limitedly fitted with the locking groove, part of the unlocking column is located in the locking groove, the second fixed shell is slidably connected with an extrusion ring, a spring is arranged between the extrusion ring and the second fixed shell, and the extrusion ring is extruded and fitted with the unlocking column.

[0010] Preferably, the first fixed shell is slidably connected to a second limiting column, a spring is provided between the second limiting column and the adjacent first fixed shell, and the first sliding rod is limitedly matched with the adjacent second limiting column.

[0011] Preferably, the first sliding rod is fixedly connected to a first extrusion rod, and the extrusion ring is extrusion-fitted with the adjacent first extrusion rod.

[0012] Preferably, a fixing rod is fixedly connected to a side of the first gear box close to the adjacent first fixing shell, a second extrusion rod is fixedly connected to a side of the first fixing shell close to the fixing rod, and the fixing rod is extrusion-fitted with the adjacent second extrusion rod.

[0013] Preferably, a fixing seat is fixedly connected to one side of the processing chamber close to the mounting frame, and a stop rod is rotatably connected to the fixing seat. A torsion spring is provided between the stop rod and the fixing seat, and the stop rod is squeezed and fitted with the adjacent sliding shell.

[0014] Preferably, the fixing seat is slidably connected to a third limiting column, a spring is provided between the third limiting column and the fixing seat, and the third limiting column is limitedly matched with the stop rod.

[0015] Preferably, a connecting pipe is further included, the connecting pipe is fixedly connected to the processing chamber, two ends of the connecting pipe are respectively connected to a side of the processing chamber close to the mounting frame and a side of the processing chamber close to the anode plate, a second rotating shaft is rotatably connected to the inside of the connecting pipe close to the motor through a fixed frame, the second rotating shaft is fixedly connected to a turbine, a third gear box is fixedly connected to the side of the connecting pipe close to the second rotating shaft through a fixed frame, the output shaft of the third gear box is fixedly connected to the second rotating shaft, a fourth gear box is fixedly connected to the mounting frame, the input shaft of the fourth gear box is fixedly connected to the output shaft of the motor, and the output shaft of the fourth gear box is fixedly connected to the input shaft of the third gear box.

[0016] The beneficial effect is that the present invention provides circumferentially uniformly distributed cathode plates, and when the copper attached to the surface of the cathode plates in use reaches a certain level, the cathode plates are replaced to ensure the continuous electrolysis and improve the rate of waste liquid recovery. Niobium-based BDD material is used for the cathode plates and anode plates, thereby extending the service life of the electrodes and improving the electrolysis rate.

[0017] When the current in the loop fluctuates, the position of the cathode plate in the waste liquid is adjusted by utilizing the magnetic force generated by the wire, thereby reducing the current fluctuation, stabilizing the electrolytic reaction, and reducing the occurrence of side reactions.

[0018] When the copper adhered to the surface of the cathode plate in use reaches a certain level, the second transmission wheel is brought into contact with the first transmission wheel, thereby automatically replacing the cathode plate. After the cathode plate is replaced, the second transmission wheel is separated from the first transmission wheel, and the first rotating shaft is stopped by the blocking of the stop rod, so that the new cathode plate is stopped in the working position.

[0019] By setting a connecting pipe and utilizing the rotation of a turbine to make the waste liquid in the treatment chamber flow, it is avoided that the copper ion concentration near the lower cathode plate decreases as the reaction proceeds, thereby preventing the electrolysis efficiency from decreasing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the mounting frame and the first rotating shaft of the present invention;

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the second gear box and the second fixed housing of the present invention;

[0023] Figure 4 It is a three-dimensional structural cross-sectional view of the rotating ring and the fixed ring of the present invention;

[0024] Figure 5 A three-dimensional structural cross-sectional view of the second sliding rod and the second fixed shell of the present invention;

[0025] Figure 6 It is a three-dimensional structural cross-sectional view of the first fixed shell and the sliding shell of the present invention;

[0026] Figure 7 It is a three-dimensional structural cross-sectional view of the first fixed shell, the first sliding rod and the second limiting column of the present invention;

[0027] Figure 8 It is a three-dimensional structural cross-sectional view of the fixing seat and the stopping rod of the present invention;

[0028] Fig. 9 It is a three-dimensional structural cross-sectional view of the processing chamber and the connecting pipe of the present invention;

[0029] Fig.10 It is a three-dimensional structural schematic diagram of the second rotating shaft and the third gear box of the present invention.

[0030] In the figure numbers: 1-processing chamber, 2-mounting frame, 3-first rotating shaft, 4-first fixed shell, 5-first sliding rod, 6-sliding shell, 7-cathode plate, 8-anode plate, 9-wire, 10-rotating ring, 11-fixed ring, 12-motor, 13-first transmission wheel, 14-first gear box, 15-second transmission wheel, 16-second sliding rod, 17-second gear box, 18-second fixed shell, 19-first limiting column, 20-unlocking column, 201-extrusion ring, 21-second limiting column, 22-first extrusion rod, 23-fixed rod, 24-second extrusion rod, 25-fixed seat, 26-stop rod, 27-third limiting column, 28-connecting pipe, 29-second rotating shaft, 30-third gear box, 31-fourth gear box. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] When cleaning the copper on the cathode surface, the existing device needs to stop the reaction and then take out the cathode for cleaning, which reduces the waste liquid recovery efficiency.

[0033] Embodiment 1: A PCB micro-etching waste liquid recovery device based on niobium-based BDD electrodes, such as Figure 1-Figure 4 and Figure 6 As shown, it includes a processing chamber 1, a mounting frame 2 is fixedly connected to the left side of the processing chamber 1, the mounting frame 2 is rotatably connected to the first rotating shaft 3, four first fixed shells 4 uniformly distributed in the circumferential direction are fixedly connected to the right side of the first rotating shaft 3, a first sliding rod 5 is slidably connected to the side of the first fixed shell 4 away from the first rotating shaft 3, a sliding shell 6 is slidably connected to the side of the first sliding rod 5 away from the first rotating shaft 3, a tension spring is arranged between the sliding shell 6 and the adjacent first fixed shell 4, the tension spring is in a stretched state when located at the lower side of the first rotating shaft 3, and is used to overcome the weight of the sliding shell 6, a cathode plate 7 is rotatably and detachably installed on the sliding shell 6, and the cathode plate 7 is used to recycle copper, an anode plate 8 is installed on the right side of the processing chamber 1, and both the cathode plate 7 and the anode plate 8 are niobium-based BD D material is used to improve the durability of the electrode and the rate of the electrolytic reaction. The anode plate 8 is connected to the positive electrode of the power supply. The sliding shell 6 is connected to a wire 9. The first rotating shaft 3 is fixedly connected to a rotating ring 10. The four wires 9 are all connected to the rotating ring 10. The mounting frame 2 is fixedly connected to a fixed ring 11. The fixed ring 11 is rotatably connected to the rotating ring 10. The sliding shell 6, the fixed ring 11 and the rotating ring 10 are all made of conductive materials. The fixed ring 11 is connected to the negative electrode of the power supply. The wire 9 is wound around the adjacent first sliding rod 5. The first sliding rod 5 and the sliding shell 6 are both made of magnetic materials, so that the wire 9 and the adjacent first sliding rod 5 cooperate to form an electromagnet to attract the adjacent sliding shell 6. When the current of the wire 9 changes, the suction force on the adjacent sliding shell 6 changes.

[0034] like Figure 1-Figure 4 and Figure 6As shown, a motor 12 is installed on the left side outside the processing chamber 1 through a fixed frame, and the output shaft of the motor 12 is fixedly connected to the first transmission wheel 13, and the mounting frame 2 is slidably connected to the first gear box 14, and the input shaft of the first gear box 14 is fixedly connected to the second transmission wheel 15, and the first transmission wheel 13 and the second transmission wheel 15 are both made of friction material, and the second transmission wheel 15 is matched with the first transmission wheel 13 for transmission. When the first transmission wheel 13 and the second transmission wheel 15 are in contact, the two are driven by friction, and the output shaft of the first gear box 14 is fixedly connected to the second sliding rod 16, and the mounting frame 2 is fixedly connected to the second gear box 17, and the output shaft of the second gear box 17 is fixedly connected to the first rotating shaft 3, and the input shaft of the second gear box 17 is fixedly connected to the second fixed shell 18, and the second fixed shell 18 is spline-connected with the second sliding rod 16, and the second fixed shell 18 and the second sliding rod 16 are used to adapt to the distance change between the first gear box 14 and the second gear box 17.

[0035] like Figure 3-Figure 6 As shown, a spring is arranged between the second fixed shell 18 and the second sliding rod 16, and the spring is initially in a compressed state, and is used to move the second sliding rod 16 downward, and the second sliding rod 16 is slidably connected with a first limiting column 19, and a spring is arranged between the first limiting column 19 and the second sliding rod 16, and the spring is used to reset the first limiting column 19, and the second fixed shell 18 is slidably connected with an unlocking column 20 that penetrates it, and the unlocking column 20 is pressed and matched with the first limiting column 19, and the unlocking column 20 moves to the left to push the first limiting column 19, so that the second fixed shell 18 and the second sliding rod 16 are in a fixed position. The second fixed shell 18 is capable of relative sliding, and a locking groove is provided on the second fixed shell 18. The first limiting column 19 is limitedly matched with the locking groove. When the first limiting column 19 is inserted into the locking groove, the second fixed shell 18 and the second sliding rod 16 are locked, and the left side of the unlocking column 20 is located in the locking groove. The second fixed shell 18 is slidably connected with a squeezing ring 201, and a spring is provided between the squeezing ring 201 and the second fixed shell 18. The spring is used to reset the squeezing ring 201, and the squeezing ring 201 is squeezed and matched with the unlocking column 20. The squeezing ring 201 moves downward to squeeze the unlocking column 20, so that the unlocking column 20 moves to the left.

[0036] like Figure 6 and Figure 7 As shown, the first fixed shell 4 is slidably connected to the second limiting column 21, and a spring is arranged between the second limiting column 21 and the adjacent first fixed shell 4. The spring is initially in a compressed state and is used to provide resistance for the adjacent second limiting column 21 to the adjacent first sliding rod 5. The first sliding rod 5 is limitedly matched with the adjacent second limiting column 21, and the first sliding rod 5 needs to overcome the resistance of the adjacent second limiting column 21 when moving.

[0037] like Figure 6As shown, the first sliding rod 5 is fixedly connected to the first extrusion rod 22 , the extrusion ring 201 is extruded and matched with the adjacent first extrusion rod 22 , and the first extrusion rod 22 moves downward to extrude the extrusion ring 201 .

[0038] like Figure 6 As shown, a fixing rod 23 is fixedly connected to the right side of the first gear box 14, and a second extrusion rod 24 is fixedly connected to the left side of the first fixed shell 4. The fixing rod 23 is extruded and matched with the adjacent second extrusion rod 24. The first fixed shell 4 drives the adjacent second extrusion rod 24 to rotate. During the rotation of the second extrusion rod 24, the fixing rod 23 is squeezed, so that the fixing rod 23 drives the second sliding rod 16 to reset.

[0039] like Figure 2 and Figure 8 As shown, a fixed seat 25 is fixedly connected to the rear portion of the left side of the processing chamber 1, and a stop rod 26 is rotatably connected to the right side of the fixed seat 25. The stop rod 26 consists of a rotating shaft and a blocking rod. A torsion spring is arranged between the stop rod 26 and the fixed seat 25, and the torsion spring is used to reset the stop rod 26. The stop rod 26 is squeezed and matched with the adjacent sliding shell 6. When the motor 12 drives the sliding shell 6 to rotate, the sliding shell 6 squeezes the stop rod 26 to rotate. When the sliding shell 6 rotates by inertia, the sliding shell 6 is blocked by the stop rod 26 and stops rotating.

[0040] like Figure 8 As shown, the fixed seat 25 is slidably connected to the third limit column 27, and a spring is arranged between the third limit column 27 and the fixed seat 25. The spring is initially in a compressed state and is used to provide resistance for the third limit column 27 to the stop rod 26. The third limit column 27 and the stop rod 26 are limited in cooperation, and the rotation of the stop rod 26 needs to overcome the resistance of the third limit column 27.

[0041] When using the device, add PCB micro-etching waste liquid into the processing chamber 1, so that the liquid level of the waste liquid is higher than the lower side of the lower cathode plate 7 and the lower side of the anode plate 8, and lower than the lower side of the lower sliding shell 6, then the anode plate 8 and the fixed ring 11 are energized to electrolyze and recover the copper in the waste liquid and start the motor 12. During electrolysis, electrons reach the lower cathode plate 7 through the negative electrode of the power supply, the fixed ring 11, the rotating ring 10, the lower side wire 9 and the lower side sliding shell 6. The remaining three cathode plates 7 do not form a loop, so the electrons will not pass through the remaining three cathode plates 7, and then the electrons combine with copper ions to form copper. In the reaction process, when the return When the current in the circuit becomes larger, the current passing through the wire 9 becomes larger, the magnetic force of the electromagnet formed by the first sliding rod 5 on the lower side and the wire 9 on the lower side is enhanced, and the attraction to the adjacent sliding shell 6 is increased, so that the sliding shell 6 moves upward. At this time, the adjacent tension spring contracts, and the sliding shell 6 drives the adjacent cathode plate 7 to move upward, thereby reducing the cross-sectional area of ​​the cathode plate 7 in contact with the waste liquid (when the cross-sectional area of ​​the conductor in the circuit becomes smaller, the resistance of the conductor becomes larger, and the current becomes smaller), thereby reducing the current in the circuit, thereby maintaining a constant current and reducing the occurrence of side reactions. When the current in the loop becomes smaller, the above process is reversed.

[0042] As the reaction proceeds, copper accumulates more and more on the surface of the lower cathode plate 7, causing the weight of the cathode plate 7 to increase. The cathode plate 7 drives the adjacent sliding shell 6 to move downward, and the cross-sectional area of ​​the cathode plate 7 immersed in the liquid surface increases. The current in the adjacent wire 9 increases, which increases the suction force of the adjacent first sliding rod 5 on the adjacent sliding shell 6. At this time, the increased weight of the cathode plate 7 acts on the first sliding rod 5. When the weight of the cathode plate 7 increases to a certain extent, the resistance of the adjacent second limiting column 21 to the adjacent first sliding rod 5 is not enough to keep the first sliding rod 5 in the current position. At this time, the first sliding rod 5 moves downward and squeezes the adjacent second limiting column 2 1, so that the second limiting column 21 moves and compresses the adjacent spring. When the first sliding rod 5 moves downward, it drives the adjacent first extrusion rod 22 to move. The first extrusion rod 22 squeezes the extrusion ring 201 to move downward and compress the adjacent spring. The extrusion ring 201 moves downward to squeeze the unlocking column 20, so that the unlocking column 20 moves to the left. When the unlocking column 20 moves to the left, it squeezes the first limiting column 19. The first limiting column 19 moves to the left and compresses the adjacent spring. When the contact position between the first limiting column 19 and the unlocking column 20 is aligned with the connection between the second sliding rod 16 and the second fixed shell 18, the second sliding rod 16 moves downward under the action of the adjacent spring. The second sliding rod 16 drives the first gear box 14 to move downward, the first gear box 14 drives the second transmission wheel 15 to move downward, and the second transmission wheel 15 stops moving when it contacts the first transmission wheel 13. At this time, the motor 12 drives the first transmission wheel 13 to rotate, and the first transmission wheel 13 drives the second transmission wheel 15 to rotate through friction. The second transmission wheel 15 drives the second sliding rod 16 to rotate through the first gear box 14, and the second sliding rod 16 drives the second fixed shell 18 to rotate. The second fixed shell 18 drives the first rotating shaft 3 to rotate through the second gear box 17, and the first rotating shaft 3 drives the rotating ring 10 and the four first fixed shells 4 from the left view direction Rotating counterclockwise, the first fixed shell 4 drives the adjacent sliding shell 6 to rotate through the adjacent first sliding rod 5, and the sliding shell 6 drives the adjacent cathode plate 7 to rotate, so as to replace the cathode plate 7 to ensure the normal progress of electrolysis. When the first sliding rod 5 rotates to the upper side, the first sliding rod 5 moves downward and resets under the action of its own mass. After the first sliding rod 5 is reset, the second limiting column 21 is reset under the action of the adjacent spring. During the rotation of the first sliding rod 5, the first sliding rod 5 drives the adjacent first extrusion rod 22 to rotate synchronously. When the first extrusion rod 22 is separated from the extrusion ring 201, the extrusion ring 201 is reset under the action of the adjacent spring.

[0043] When the sliding shell 6 rotates, the sliding shell 6 on the rear side rotates to squeeze the stop rod 26, and the stop rod 26 rotates and causes the adjacent torsion spring to store force. When the stop rod 26 rotates, it squeezes the adjacent third limiting column 27, and the third limiting column 27 moves downward and compresses the adjacent spring. When the sliding shell 6 on the rear side is separated from the stop rod 26, the stop rod 26 is reset under the action of the adjacent torsion spring, and then the third limiting column 27 limits the stop rod 26 again, and the first fixed shell 4 on the rear side drives the adjacent second extrusion rod 24 to rotate. When the second extrusion rod 24 on the rear side reaches the lower side, the second extrusion rod 24 squeezes the fixed rod 23, so that the fixed rod 23 drives the first gear box 14 to move upward, and the first gear box 14 drives the second transmission wheel 15 to move upward, and the second transmission wheel 15 is separated from the first transmission wheel 13, and the transmission between the two is terminated. At this time, the first rotating shaft 3 continues to rotate under the action of inertia, and drives the second extrusion rod 24 to squeeze the fixed rod 23. When the first gear box 14 is reset, the second sliding rod 16 is driven to reset when the first gear box 14 is reset, and the second sliding rod 16 drives the first limiting column 19 to move upward. When the first limiting column 19 moves to align with the unlocking column 20, the first limiting column 19 moves to the right under the action of the adjacent spring and pushes the unlocking column 20 to reset. At this time, the first limiting column 19 locks the second sliding rod 16 and the second fixed shell 18 again, and then the second squeezing rod 24 is separated from the fixed rod 23. At this time, the sliding shell 6 on the original upper side rotates to contact the stop rod 26, but at this time the first rotating shaft 3 only rotates by inertia, so the sliding shell 6 cannot squeeze the stop rod 26 to overcome the resistance of the third limiting column 27, thereby stopping the rotation of the first rotating shaft 3. At this point, the switching of the cathode plate 7 is completed, and then the cathode plate 7 with copper attached is removed and replaced for subsequent use. The above working process is repeated to ensure the continuous electrolysis and improve the waste liquid recovery efficiency.

[0044] During the electrolysis process of the existing device, the copper ions near the cathode gradually turn into copper and adhere to the cathode, which will reduce the concentration of copper ions near the cathode and reduce the probability of copper ions obtaining electrons from the cathode, thereby reducing the electrolysis efficiency.

[0045] Embodiment 2: Based on embodiment 1, Figure 1 , Fig. 9 and Fig.10As shown, a C-shaped connecting pipe 28 is also included, and the connecting pipe 28 is fixedly connected to the outer side of the processing chamber 1. The two ends of the connecting pipe 28 are respectively connected to the left side and the right side of the processing chamber 1. The left side of the connecting pipe 28 is rotatably connected to a second rotating shaft 29 through a fixed frame. The second rotating shaft 29 is fixedly connected to a turbine, and the turbine is used to make the waste liquid flow. The left side of the connecting pipe 28 is fixedly connected to a third gear box 30 through a fixed frame. The output shaft of the third gear box 30 is fixedly connected to the second rotating shaft 29. The mounting frame 2 is fixedly connected to a fourth gear box 31. The input shaft of the fourth gear box 31 is fixedly connected to the output shaft of the motor 12, and the output shaft of the fourth gear box 31 is fixedly connected to the input shaft of the third gear box 30.

[0046] When the motor 12 rotates, the output shaft of the motor 12 drives the second rotating shaft 29 to rotate through the fourth gear box 31 and the third gear box 30, and the second rotating shaft 29 drives the turbine thereon to rotate. Through the rotation of the turbine, the waste liquid in the processing chamber 1 is circulated through the connecting pipe 28, thereby avoiding the decrease in copper ion concentration near the lower cathode plate 7 as the reaction proceeds, resulting in a decrease in electrolysis efficiency.

[0047] The technical principles of the embodiments of the present invention are described above in conjunction with specific embodiments. These descriptions are only for explaining the principles of the embodiments of the present invention and cannot be interpreted in any way as limiting the protection scope of the embodiments of the present invention. Based on the explanations herein, those skilled in the art can think of other specific implementation methods of the embodiments of the present invention without creative work, and these methods will fall within the protection scope of the embodiments of the present invention.

Claims

1. A PCB micro-etching waste liquid recovery device based on a niobium-based BDD electrode, comprising a processing chamber (1), a mounting frame (2) being fixedly connected to one side of the processing chamber (1), characterized in that: The processing chamber (1) further comprises a first rotating shaft (3), wherein the first rotating shaft (3) is rotatably connected to the mounting frame (2), the first rotating shaft (3) is fixedly connected to a first fixed shell (4) uniformly distributed in the circumferential direction, the first fixed shell (4) is slidably connected to a first sliding rod (5) on a side away from the first rotating shaft (3), the first sliding rod (5) is slidably connected to a sliding shell (6) on a side away from the first rotating shaft (3), a tension spring is provided between the sliding shell (6) and the adjacent first fixed shell (4), the sliding shell (6) is rotatably and detachably mounted with a cathode plate (7), and the side of the processing chamber (1) away from the mounting frame (2) An anode plate (8) is installed, the cathode plate (7) and the anode plate (8) are both made of niobium-based BDD material, the anode plate (8) is connected to the positive electrode of a power source, the sliding shell (6) is connected to a wire (9), the first rotating shaft (3) is fixedly connected to a rotating ring (10), the wires (9) uniformly distributed in the circumferential direction are all connected to the rotating ring (10), the mounting frame (2) is fixedly connected to a fixing ring (11), the fixing ring (11) is rotatably connected to the rotating ring (10), the sliding shell (6), the fixing ring (11) and the rotating ring (10) are all made of conductive materials, and the fixing ring (11) is connected to the negative electrode of the power source.

2. The PCB micro-etching waste liquid recovery device based on niobium-based BDD electrode according to claim 1 is characterized in that: The wire (9) is wound around the adjacent first sliding rod (5), and the first sliding rod (5) and the sliding shell (6) are both made of magnetic material.

3. The PCB micro-etching waste liquid recovery device based on niobium-based BDD electrode according to claim 1 is characterized in that: A motor (12) is installed on a side of the processing chamber (1) near the mounting frame (2) through a fixing frame, the output shaft of the motor (12) is fixedly connected to a first transmission wheel (13), the mounting frame (2) is slidably connected to a first gear box (14), the input shaft of the first gear box (14) is fixedly connected to a second transmission wheel (15), the second transmission wheel (15) is in transmission cooperation with the first transmission wheel (13), the output shaft of the first gear box (14) is fixedly connected to a second sliding rod (16), the mounting frame (2) is fixedly connected to a second gear box (17), the output shaft of the second gear box (17) is fixedly connected to the first rotating shaft (3), the input shaft of the second gear box (17) is fixedly connected to a second fixing shell (18), and the second fixing shell (18) is spline-connected to the second sliding rod (16).

4. The PCB micro-etching waste liquid recovery device based on niobium-based BDD electrodes according to claim 3 is characterized in that: A spring is arranged between the second fixed shell (18) and the second sliding rod (16); the second sliding rod (16) is slidably connected to a first limiting column (19); a spring is arranged between the first limiting column (19) and the second sliding rod (16); the second fixed shell (18) is slidably connected to an unlocking column (20) penetrating the second fixed shell (18); the unlocking column (20) is pressed and matched with the first limiting column (19); the second fixed shell (18) is provided with a locking groove; the first limiting column (19) is limitedly matched with the locking groove; a part of the unlocking column (20) is located in the locking groove; the second fixed shell (18) is slidably connected to an extrusion ring (201); a spring is arranged between the extrusion ring (201) and the second fixed shell (18); the extrusion ring (201) is pressed and matched with the unlocking column (20).

5. The PCB micro-etching waste liquid recovery device based on niobium-based BDD electrodes according to claim 4 is characterized in that: The first fixed shell (4) is slidably connected to a second limiting column (21), a spring is provided between the second limiting column (21) and the adjacent first fixed shell (4), and the first sliding rod (5) is limitedly matched with the adjacent second limiting column (21).

6. The PCB micro-etching waste liquid recovery device based on niobium-based BDD electrodes according to claim 5 is characterized in that: The first sliding rod (5) is fixedly connected to a first extrusion rod (22), and the extrusion ring (201) is extrusion-matched with the adjacent first extrusion rod (22).

7. The PCB micro-etching waste liquid recovery device based on niobium-based BDD electrodes according to claim 6 is characterized by: A fixing rod (23) is fixedly connected to one side of the first gear box (14) close to the adjacent first fixing shell (4), a second extrusion rod (24) is fixedly connected to one side of the first fixing shell (4) close to the fixing rod (23), and the fixing rod (23) is extruded and matched with the adjacent second extrusion rod (24).

8. The PCB micro-etching waste liquid recovery device based on niobium-based BDD electrodes according to claim 3 is characterized by: A fixing seat (25) is fixedly connected to one side of the processing chamber (1) close to the mounting frame (2); a stop rod (26) is rotatably connected to the fixing seat (25); a torsion spring is provided between the stop rod (26) and the fixing seat (25); and the stop rod (26) is pressed and fitted with the adjacent sliding shell (6).

9. The PCB micro-etching waste liquid recovery device based on niobium-based BDD electrodes according to claim 8, characterized in that: The fixing seat (25) is slidably connected to a third limiting column (27), a spring is provided between the third limiting column (27) and the fixing seat (25), and the third limiting column (27) is in limiting cooperation with the stop rod (26).

10. The PCB micro-etching waste liquid recovery device based on niobium-based BDD electrodes according to claim 3, characterized in that: The invention also comprises a connecting pipe (28), wherein the connecting pipe (28) is fixedly connected to the processing chamber (1), and the two ends of the connecting pipe (28) are respectively connected to a side of the processing chamber (1) close to the mounting frame (2) and a side of the processing chamber (1) close to the anode plate (8). A second rotating shaft (29) is rotatably connected to the inside of the connecting pipe (28) close to the motor (12) through a fixing frame, and the second rotating shaft (29) is fixedly connected to a turbine. A third gear box (30) is fixedly connected to the side of the connecting pipe (28) close to the second rotating shaft (29) through a fixing frame, and the output shaft of the third gear box (30) is fixedly connected to the second rotating shaft (29). A fourth gear box (31) is fixedly connected to the mounting frame (2), and the input shaft of the fourth gear box (31) is fixedly connected to the output shaft of the motor (12), and the output shaft of the fourth gear box (31) is fixedly connected to the input shaft of the third gear box (30).

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