Positive and negative photoresist separation device and separation method for recycling PCB (printed circuit board) developing solution

Abstract

The invention discloses a positive and negative photoresist separation device and separation method for recycling a PCB developing solution, and relates to the technical field of photoresist separation, the positive and negative photoresist separation device comprises a solution barrel, an equivalent intermittent feeding mechanism is arranged on the solution barrel, and an auxiliary feeding and stability maintaining mechanism is arranged below the equivalent intermittent feeding mechanism; due to the arrangement of the auxiliary feeding and stability maintaining mechanism, an extraction solvent and a mixed solvent are different in density, the extraction solvent is directly fed to the bottom in a solution barrel under the cooperation of a discharging pipe, an auxiliary pipe and a feeding hole, the extraction solvent is injected from the bottom, and the solvent is rapidly diffused at the bottom by means of the convection effect generated by the density difference; compared with the mode that the solvent is fed from the surface of the solution, the solvent feeding device is more efficient, and the situation that when the solvent is fed from the surface, the impact force of the solution makes contact with air, a large number of bubbles are introduced to affect the mixing effect, and then the subsequent separation process is affected is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of photoresist separation, in particular to a positive and negative photoresist separation device and a separation method for recovering PCB developer solution. Background Art

[0002] PCB (printed circuit board) developer is a chemical solution used to dissolve the copper foil that is not covered by photoresist during the PCB manufacturing process, so that the circuit pattern can appear. This developer contains positive and negative photoresists. If it is discharged directly, it will not only cause waste of resources, but also pollute the environment. The positive and negative photoresist separation device for PCB developer recovery can effectively separate the positive and negative photoresists in the PCB developer, thereby achieving resource recycling, reducing production costs and reducing environmental pollution.

[0003] In the prior art, when adding an extraction solvent to separate the recovered mixed solution of the photoresist and the PCB developer, a dropper, a dropping funnel, or the like is usually used to slowly drop the extraction solvent into the mixed solution. This operation is relatively cumbersome and time-consuming, and is particularly inefficient when processing a large amount of mixed solution. It is also difficult to ensure uniformity of the drop addition, which results in a situation where the concentration of the extraction solvent is high in a local area and low in other areas. After the solution is added from the surface, it takes a long time to diffuse to the bottom. The operation of dropping from the top will prevent the extraction solvent from being directly injected into the bottom of the mixed solution, and the contact area between the two solvents is limited, resulting in insufficient mixing, which makes the mixed solution The photoresist and developer components cannot interact with the extraction solvent efficiently, resulting in a slow separation process and greatly reduced separation efficiency. The portion close to the surface of the mixed solution will come into contact with the extraction solvent faster, but the solution at the bottom will take longer to interact with enough extraction solvent. The concentration gradient will hinder the uniformity of the separation, making it difficult for some photoresist and developer components to be effectively extracted, reducing the overall separation effect. In addition, the extraction solvent is volatile. Because the extraction solvent takes a longer time to fully contact with the mixed solution, if it cannot be directly poured to the bottom, more extraction solvent will evaporate into the air, causing environmental pollution and safety hazards.

[0004] Therefore, a positive and negative photoresist separation device and separation method for PCB developer recovery are proposed to solve the above problems. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a positive and negative photoresist separation device and a separation method for recovering PCB developer solution to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: A positive and negative photoresist separation device for PCB developer recovery comprises: a solution barrel, an equal amount intermittent delivery mechanism is provided on the solution barrel, and an auxiliary delivery stabilization mechanism is provided below the equal amount intermittent delivery mechanism;

[0007] The equal amount intermittent delivery mechanism is used to intermittently deliver equal amounts of solvent for dissolving the developer and the photoresist into the solution barrel;

[0008] The auxiliary delivery and stabilization mechanism is used to assist the mixing and stabilization of the mixed solution of the solvent, the developer and the photoresist and to prevent the volatilization of the solvent.

[0009] Preferably, the equal-amount intermittent dosing mechanism includes a support plate, the support plate is fixedly connected to the solution barrel, one end of the support plate is fixedly connected to a positioning plate, one side of the positioning plate is fixedly connected to a driving motor, the output shaft of the driving motor passes through the positioning plate and is fixedly connected to a transmission member, the end of the transmission member away from the driving motor is fixedly connected to a spur gear, a side of the spur gear away from the transmission member is meshedly connected to a reverse gear, a side of the spur gear close to the reverse gear is rotatably connected to a sleeve, an end of the sleeve away from the spur gear is fixedly connected to the reverse gear, a buffer spring is sleeved on the outer ring of the sleeve, and both ends of the buffer spring are respectively fixedly connected to the spur gear and the reverse gear.

[0010] Preferably, the equal-amount intermittent delivery mechanism also includes a buffer tube, the buffer tube is fixedly connected to the middle part of the side of the reverse gear away from the spur gear, the side of the buffer tube away from the reverse gear is fixedly connected to two buffer parts, a positioning column is slidably connected in the buffer tube, a through hole is opened in the positioning column, the buffer part is slidably connected in the hole opened on the positioning column, the side of the positioning column away from the buffer tube is fixedly connected to a material transport tray, the outer ring of the material transport tray is sleeved with an auxiliary shell, the side of the auxiliary shell away from the material transport tray is fixedly connected to the positioning plate, and the bottom of the auxiliary shell is fixedly connected to a discharge pipe.

[0011] Preferably, the auxiliary delivery and stabilization mechanism includes a stirring shaft tube, which is rotatably connected to the bottom of the inner cavity of the solution barrel, and one end of the stirring shaft tube away from the solution barrel is rotatably connected to the support plate, one end of the transmission member away from the spur gear is rotatably connected to a coupling, and one end of the coupling member away from the transmission member is fixedly connected to a piston column, and the piston column is slidably connected in the stirring shaft tube, and an air intake valve is fixedly connected to the stirring shaft tube, and an auxiliary pipe is rotatably connected to the outer ring of the stirring shaft tube, and a plurality of feeding holes are provided on the outer ring of the stirring shaft tube at the position of the auxiliary pipe, and the air intake valve is located below the auxiliary pipe, and a solenoid valve plate is fixedly connected to the stirring shaft tube between the piston column and the solenoid valve plate, and an air pressure block slidably connected to the stirring shaft tube is arranged below the solenoid valve plate, and one end of the air pressure block away from the solenoid valve plate is fixedly connected to an auxiliary spring, and one end of the auxiliary spring away from the air pressure block is fixedly connected to the bottom of the inner cavity of the stirring shaft tube, and a plurality of discharge holes are provided at the bottom of the stirring shaft tube around the center of the stirring shaft tube.

[0012] Preferably, the support plate is V-shaped and both ends of the support plate are fixedly connected to the solution barrel, the positioning plate consists of two plates symmetrically arranged with the support plate as the center, and the transmission member consists of two transmission wheels and a transmission belt sleeved outside the transmission wheels.

[0013] Preferably, two buffer members are symmetrically arranged with the center of the buffer tube as the axis, the buffer member is composed of a sliding column and a return spring, two through holes on the positioning column are symmetrically arranged with the center of the positioning column as the axis, a plurality of grooves are arranged on the outer ring of the conveying tray, the auxiliary shell is composed of a lower hopper at the top, a middle outer shell and an inclined discharge port at the bottom, the conveying tray is rotatably connected to the outer shell in the middle of the auxiliary shell, and the auxiliary shell is connected to the grooves on the outer ring of the conveying tray and the discharge pipe.

[0014] Preferably, the stirring shaft tube is driven by a built-in motor, the coupling consists of two rotatably connected shafts, a hole is provided on the auxiliary tube to connect the inner cavity of the auxiliary tube with the discharge pipe, the solenoid valve sheet is electrically connected to an external controller, an inner cavity is provided on one end of the air pressure block close to the auxiliary spring, and a one-way clamp is provided on the discharge hole so that it can only deflect toward the outside of the stirring shaft tube.

[0015] A method for separating positive and negative photoresists for recovering PCB developer comprises the following steps:

[0016] Step 1: Determine whether the photoresist used on the PCB is positive or negative based on the different chemical properties of the photoresist, analyze the type of photoresist, and then select the appropriate solvent;

[0017] Step 2: According to the type of photoresist, a solvent is selected from common organic solvents, which has a high solubility for the photoresist and a low solubility for other substances such as a developer;

[0018] Step 3: Put the PCB developer recovery mixture containing the photoresist into the solution barrel. After the drive motor is started, the conveying plate is driven to rotate through the cooperation of the spur gear and the reverse gear, and the extraction solvent in the lower hopper in the auxiliary shell is divided into equal amounts and intermittently transported to the oblique discharge port in the auxiliary shell. Under the action of the auxiliary shell and the discharge pipe arranged at the bottom of the stirring shaft tube, the extraction solvent directly flows to the bottom of the mixed solution in the solution barrel, and mixes with the PCB developer recovery mixture, so that the photoresist is fully dissolved in the extraction solvent;

[0019] Step 4: After mixing, the photoresist is dissolved in the extraction solvent to form an extraction phase with different densities from the phases where other substances are located, and the phases will gradually separate. Therefore, the mixed solution is allowed to stand in the solution barrel for about one to two hours to allow the solution to fully separate.

[0020] Step 5: Use a separatory funnel or other separation equipment to release the extraction phase containing the photoresist from the bottom of the container or suck it out from the upper layer to separate it.

[0021] Compared with the prior art, the present invention provides a positive and negative photoresist separation device and separation method for PCB developer recovery, which has the following beneficial effects:

[0022] 1. Through the setting of the equal amount intermittent delivery mechanism, the extraction solvent is placed in a closed cavity for storage, and then directly flows into the stirring shaft tube through the discharge pipe, and is delivered to the bottom of the mixed solution in the solution barrel. The extraction solvent is delivered in the closed cavity formed by the auxiliary shell and the discharge pipe, so as to avoid the extraction solvent being directly exposed to the air and causing rapid volatilization by directly delivering the extraction solvent from the top to the mixed solution. The release of the extraction solvent vapor can be reduced, thereby effectively reducing the loss of the solvent by volatilization, saving costs, reducing the pollution of the solvent volatilization to the environment and the harm to the health of operators, and reducing volatilization also helps to maintain the stability of the chemical properties of the solvent.

[0023] 2. By setting up a material transport tray and opening multiple grooves on the outer ring of the material transport tray, the extraction solvent stored in the auxiliary shell is divided into equal amounts and put into the solution barrel to mix with the mixed solution. The equal amount packaging can ensure that the amount of solvent added each time is accurate and consistent, ensure the stability of the solubility of the photoresist, improve the efficiency and purity of the separation, and make the separation process more stable and repeatable. Intermittent addition allows the extraction solvent to flow into the mixed solvent, which allows the solvent and the mixed solution to have enough time to fully react and mix, and better control the chemical reactions and physical changes in the separation process.

[0024] 3. Through the setting of the auxiliary delivery and stabilization mechanism, due to the different densities of the extraction solvent and the mixed solvent, the extraction solvent is directly delivered from top to bottom to the bottom of the solution barrel with the cooperation of the discharge pipe, the auxiliary pipe and the feed hole. The extraction solvent is directly added to the mixed solution from the bottom. According to the physical principle, liquids with different densities will produce stratification due to gravity in the same container. When the extraction solvent is injected into the mixed solution from the bottom, this density difference will trigger the natural flow of the liquid, the lighter one will float up and the heavier one will sink, thus forming convection, and then the convection effect generated by the density difference between the extraction solvent and the mixed solution can be used to make the solvent diffuse rapidly at the bottom and mix with the surrounding solution more quickly to reach a uniform state. Compared with delivering the solvent from the surface of the solution, it is more efficient and avoids the situation where a large number of bubbles are introduced due to the impact force of the solution and the contact with the air when the solvent is delivered from the surface, affecting the mixing effect, thereby affecting the subsequent separation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a structural diagram of the solution barrel of the present invention;

[0027] Figure 3 This is a structural diagram of the equal amount intermittent delivery mechanism of the present invention;

[0028] Figure 4 This is a disassembled structural diagram of the equal amount intermittent delivery mechanism of the present invention;

[0029] Figure 5 For the present invention Figure 4 The enlarged structural diagram at A in the middle;

[0030] Figure 6 This is a structural diagram of the equal-amount intermittent delivery mechanism of the present invention disassembled from another angle;

[0031] Figure 7 It is a structural diagram of the equal-amount intermittent delivery mechanism and the auxiliary delivery stabilization mechanism of the present invention;

[0032] Figure 8 For the present invention Figure 7 The structure diagram at B is enlarged;

[0033] Fig. 9 For the present invention Figure 7 Enlarged structural diagram at center C.

[0034] In the figure:

[0035] 1. Solution barrel;

[0036] 2. Equal amount intermittent delivery mechanism; 21. Support plate; 22. Positioning plate; 23. Driving motor; 24. Transmission member; 25. Spur gear; 26. Reverse gear; 27. Sleeve; 28. Buffer spring; 29. ​​Buffer tube; 210. Buffer member; 211. Positioning column; 212. Material transport tray; 213. Auxiliary housing; 214. Discharging pipe;

[0037] 3. Auxiliary feeding and stabilizing mechanism; 31. Stirring shaft tube; 32. Connecting shaft; 33. Piston rod; 34. Inlet valve; 35. Auxiliary pipe; 36. Feed hole; 37. Solenoid valve plate; 38. Air pressure block; 39. Auxiliary spring; 310. Discharge hole. DETAILED DESCRIPTION

[0038] 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.

[0039] The present invention is further described in detail below based on the accompanying drawings and embodiments.

[0040] Example

[0041] Please refer to Figures 1 to 6 As shown:

[0042] In order to solve the problems mentioned in the technical solution, the embodiment of the present application provides a positive and negative photoresist separation device and separation method for PCB developer recovery, comprising: a solution barrel 1, an equal amount intermittent delivery mechanism 2 is provided on the solution barrel 1, and an auxiliary delivery stabilization mechanism 3 is provided below the equal amount intermittent delivery mechanism 2;

[0043] The equal intermittent delivery mechanism 2 is used to intermittently deliver the solvent for dissolving the developer and the photoresist into the solution barrel 1 in equal amounts. The equal intermittent delivery mechanism 2 includes a support plate 21, which is fixedly connected to the solution barrel 1. The support plate 21 is V-shaped and both ends of the support plate 21 are respectively fixedly connected to the solution barrel 1. A positioning plate 22 is fixedly connected to one end of the support plate 21. The positioning plate 22 is composed of two plates symmetrically arranged with the support plate 21 as the center. A driving motor 23 is fixedly connected to one side of the positioning plate 22. The output shaft of the driving motor 23 passes through the positioning plate 22 and is fixedly connected to a transmission member 24. The transmission member 24 is mainly used to link the spur gear 25 with the coupling member 32 Synchronous rotation movement, the transmission member 24 is composed of two transmission wheels and a transmission belt sleeved outside the transmission wheel. The end of the transmission member 24 away from the driving motor 23 is fixedly connected with a spur gear 25. The spur gear 25 is mainly used for forward rotation and meshing with the reverse gear 26, driving the reverse gear 26 to rotate synchronously. The side of the spur gear 25 away from the transmission member 24 is meshed and connected with the reverse gear 26. The side of the spur gear 25 close to the reverse gear 26 is rotatably connected with a sleeve 27. The end of the sleeve 27 away from the spur gear 25 is fixedly connected with the reverse gear 26. The outer ring of the sleeve 27 is sleeved with a buffer spring 28. The two ends of the buffer spring 28 are respectively fixedly connected with the spur gear 25 and the reverse gear 26.

[0044] The equal-amount intermittent delivery mechanism 2 also includes a buffer tube 29, which is fixedly connected to the middle of the side of the counter gear 26 away from the spur gear 25. The side of the buffer tube 29 away from the counter gear 26 is fixedly connected with two buffer members 210, and the buffer members 210 are symmetrically arranged with the center of the buffer tube 29 as the axis. The buffer member 210 is composed of a sliding column and a return spring. A positioning column 211 is slidably connected in the buffer tube 29, and a through hole is opened in the positioning column 211. There are two through holes on the positioning column 211 symmetrically opened with the center of the positioning column 211 as the axis. The buffer member 210 is slidably connected in the hole opened on the positioning column 211, and the positioning column 211 is far away. A material transport tray 212 is fixedly connected to one side away from the buffer tube 29. A plurality of grooves are provided on the outer ring of the material transport tray 212. The grooves on the outer ring of the material transport tray 212 are mainly used for dispensing solvents in equal amounts. An auxiliary shell 213 is sleeved on the outer ring of the material transport tray 212. The auxiliary shell 213 is composed of an upper lower hopper, a middle outer shell and a lower oblique discharge port. The material transport tray 212 is rotatably connected to the outer shell in the middle of the auxiliary shell 213. The side of the auxiliary shell 213 away from the material transport tray 212 is fixedly connected to the positioning plate 22. A discharge pipe 214 is fixedly connected to the bottom of the auxiliary shell 213. The auxiliary shell 213 is connected to the grooves on the outer ring of the material transport tray 212 and the discharge pipe 214.

[0045] For further examples, please refer to Figures 7 to 9 As shown:

[0046] The auxiliary feeding stabilization mechanism 3 is used to assist the solvent in mixing the mixed solution of the developer and the photoresist stably and to prevent the solvent from volatilizing. The auxiliary feeding stabilization mechanism 3 includes a stirring shaft tube 31, which is rotatably connected to the bottom of the inner cavity of the solution barrel 1. The stirring shaft tube 31 is driven by a built-in motor. The end of the stirring shaft tube 31 away from the solution barrel 1 is rotatably connected to the support plate 21. The end of the transmission member 24 away from the spur gear 25 is rotatably connected to a coupling member 32. The coupling member 32 consists of two rotatably connected shaft rods. The end of the coupling 32 away from the transmission member 24 is fixedly connected with a piston column 33. The piston column 33 is mainly used to introduce external gas through the intake valve 34 when moving upward, and then squeeze the gas into the cavity formed by the electromagnetic valve plate 37 and the air pressure block 38 when moving downward. The piston column 33 is slidably connected in the stirring shaft tube 31, and the intake valve 34 is fixedly connected to the stirring shaft tube 31. The outer ring of the stirring shaft tube 31 is rotatably connected with an auxiliary tube 35, and a hole is opened on the auxiliary tube 35 so that the inner cavity of the auxiliary tube 35 is connected to the discharge tube 21 4, a plurality of feed holes 36 are provided on the outer ring of the stirring shaft tube 31 at the position of the auxiliary tube 35, an air inlet valve 34 is located below the auxiliary tube 35, a solenoid valve plate 37 is fixedly connected to the stirring shaft tube 31 between the piston column 33 and the solenoid valve plate 37, the solenoid valve plate 37 is electrically connected to an external controller, and a gas pressure block 38 is provided below the solenoid valve plate 37 and is slidably connected to the stirring shaft tube 31, the gas pressure block 38 is used to move downward under the pressure of high-pressure gas to push the solvent flowing below the gas pressure block 38 The liquid flows into the solution barrel 1 through the discharge hole 310 and mixes with the mixed solution. The end of the air pressure block 38 away from the solenoid valve plate 37 is fixedly connected to the auxiliary spring 39. The end of the air pressure block 38 close to the auxiliary spring 39 is provided with an inner cavity. The end of the auxiliary spring 39 away from the air pressure block 38 is fixedly connected to the bottom of the inner cavity of the stirring shaft tube 31. A plurality of discharge holes 310 are provided at the bottom of the stirring shaft tube 31 around the center of the stirring shaft tube 31. A one-way clamp is provided on the discharge hole 310 so that it can only deflect toward the outside of the stirring shaft tube 31.

[0047] A method for separating positive and negative photoresists for recovering PCB developer comprises the following steps:

[0048] Step 1: Determine whether the photoresist used on the PCB is positive or negative based on the different chemical properties of the photoresist, analyze the type of photoresist, and then select the appropriate solvent;

[0049] Step 2: According to the type of photoresist, a solvent is selected from common organic solvents, which has a high solubility for the photoresist and a low solubility for other substances such as a developer;

[0050] Step 3: Put the PCB developer recovery mixture containing the photoresist into the solution barrel 1. After the driving motor 23 is started, the material transport plate 212 is driven to rotate through the cooperation of the spur gear 25 and the reverse gear 26, and the extraction solvent in the lower hopper in the auxiliary shell 213 is divided into equal amounts and intermittently transported to the oblique discharge port in the auxiliary shell 213. Under the action of the auxiliary shell 213 and the discharge pipe 214 arranged at the bottom of the stirring shaft tube 31, the extraction solvent directly flows to the bottom of the mixed solution in the solution barrel 1, and mixes with the PCB developer recovery mixture, so that the photoresist is fully dissolved in the extraction solvent;

[0051] Step 4: After the mixing is completed, the photoresist is dissolved in the extraction solvent to form an extraction phase, and the density of the phase where other substances are located is different, so the mixed solution is allowed to stand in the solution barrel 1 for about one to two hours to allow the solution to be fully separated;

[0052] Step 5: Use a separatory funnel or other separation equipment to release the extraction phase containing the photoresist from the bottom of the container or suck it out from the upper layer to separate it.

[0053] Everything in the above example works like this:

[0054] The following is the working process of the equal intermittent delivery mechanism 2 for delivering equal amounts of solvent for dissolving the developer and the photoresist intermittently into the solution barrel 1:

[0055] When in use, the extraction solvent is stored in the lower hopper in the auxiliary shell 213, and the lower hopper filled with the extraction solvent is in a closed state, and then the drive motor 23 is started, and the output shaft of the drive motor 23 drives the transmission member 24 to rotate in the opposite direction. During the reverse rotation of the transmission member 24, the spur gear 25 rotates in the opposite direction synchronously, and then under the action of the spur gear 25 and the reverse gear 26 meshing, the reverse rotation of the spur gear 25 drives the reverse gear 26 meshing with the tooth column to rotate in the opposite direction synchronously, and under the reverse rotation of the reverse gear 26, and the matching setting of the buffer tube 29 connected to the reverse gear 26 and the positioning column 211 through the two buffer members 210, the intermittent reverse rotation of the reverse gear 26 synchronously drives the transport plate 212 fixedly connected to the positioning column 211 in the auxiliary shell. The shell 213 rotates in the opposite direction. Since the extraction solvent is stored in the lower hopper of the auxiliary shell 213, the solvent flows into the groove of the conveying disk 212 under the setting of the outer ring groove of the conveying disk 212 for equal packaging. After packaging, the extraction solvent gradually moves to the oblique discharge port below the auxiliary shell 213 along the counterclockwise rotation of the conveying disk 212. After rotating to the top of the oblique discharge port, under the action of gravity, the extraction solvent in the groove of the conveying disk 212 flows to the oblique discharge port of the auxiliary shell 213, and flows into the discharge pipe 214 under the oblique guiding action. Then, since the discharge pipe 214 is arranged on the auxiliary pipe 35, and the auxiliary pipe 35 is located in the solution barrel 1, the extraction solvent is directly circulated to the bottom of the mixing shaft tube 31 cavity, and then operated with the recovered mixed solution of the photoresist and the PCB developer.

[0056] Furthermore, the driving motor 23 rotates in the reverse direction, and with the cooperation of multiple structures, drives the material transporting plate 212 to put an equal amount of extraction solvent in the auxiliary shell 213 into the discharge pipe 214, and then the driving motor 23 rotates forward. When the driving motor 23 rotates forward, due to the reverse setting of the tooth columns on the spur gear 25 and the reverse gear 26, the forward rotation of the spur gear 25 cannot be meshed with the reverse gear 26, and the tooth column on the spur gear 25 gradually slides on the tooth column on the reverse gear 26. Therefore, when the output shaft of the driving motor 23 drives the spur gear 25 to rotate forward, the spur gear 25, under the oblique action of the tooth block, intermittently pushes the reverse gear 26 to reciprocate, and the sleeve 27 and the buffer spring 2 8, the reverse gear 26 is prevented from changing the spacing with the spur gear 25 when it moves back and forth, and the spur gear 25 and the reverse gear 26 are prevented from forming an eccentric circle. Further, under the cooperation of the buffer tube 29 and the buffer member 210 provided on the reverse gear 26, when the reverse gear 26 moves back and forth, the buffer member 210 assists the reverse gear 26 to move toward the material transporting plate 212 to avoid being squeezed to the material transporting plate 212, and assists the reset of the reverse gear 26 when the reverse gear 26 is away from the material transporting plate 212. The provision of the two buffer members 210 ensures that when the reverse gear 26 rotates in the opposite direction with the spur gear 25, the material transporting plate 212 can be driven to rotate synchronously through the plug-in effect of the buffer member 210 and the positioning column 211.

[0057] By setting up the equal-amount intermittent dosing mechanism 2, the extraction solvent is placed in a closed cavity for storage, and then directly flows into the stirring shaft tube 31 through the discharge pipe 214, and is delivered to the bottom of the mixed solution in the solution barrel 1. The extraction solvent is added into the closed cavity formed by the auxiliary shell 213 and the discharge pipe 214, so as to avoid directly adding the extraction solvent into the mixed solution from the top, which causes the solvent to be directly exposed to the air and cause rapid volatilization. The release of the extraction solvent vapor can be reduced, thereby effectively reducing the volatilization loss of the solvent, saving costs, reducing the pollution of the solvent volatilization to the environment and the harm to the health of operators. The reduced volatilization also helps to maintain the stability of the chemical properties of the solvent.

[0058] By setting up the material transport tray 212 and opening a plurality of grooves on the outer ring of the material transport tray 212, the extraction solvent stored in the auxiliary shell 213 is divided into equal amounts and added into the solution barrel 1 to be mixed with the mixed solution. The equal amounts of packaging can ensure that the amount of solvent added each time is accurate and consistent, ensure the stability of the solubility of the photoresist, improve the efficiency and purity of the separation, and make the separation process more stable and repeatable. Intermittent addition allows the extraction solvent to flow into the mixed solvent, which allows the solvent and the mixed solution to have enough time to fully react and mix, and better control the chemical reactions and physical changes in the separation process.

[0059] Please refer to the above working process Figures 1 to 6 .

[0060] The following is the working process of the auxiliary delivery stabilization mechanism 3 for assisting the mixing of the solvent with the mixed solution of the developer and the photoresist and preventing the volatilization of the solvent:

[0061] When in use, the positive and negative rotations of the spur gear 25 are both driven by the transmission member 24 to synchronously transmit the coupling member 32 to perform rotational motion in the positive and negative directions. Since the spur gear 25 does not drive the reverse gear 26 to rotate in the reverse direction when rotating forward, the extraction solvent in the auxiliary shell 213 does not continue to be delivered to the inner cavity of the stirring shaft tube 31 through the discharge pipe 214. The bottom of the stirring shaft tube 31 is equipped with the extraction solvent flowing in the discharge pipe 214. Therefore, in this state, the positive rotation drive of the drive motor 23 continues to drive the coupling member 32 to rotate through the transmission member 24. During the rotation of the coupling 32, the piston rod 33 is driven to reciprocate up and down in the stirring shaft tube 31. During the upward movement of the piston rod 33, the air intake valve 34 is set to guide the external air into the cavity formed by the piston rod 33 and the electromagnetic valve plate 37 in the stirring shaft tube 31. Then, during the downward movement of the piston rod 33, the air stored in the cavity formed by the piston rod 33 and the electromagnetic valve plate 37 is squeezed. During the downward movement of the piston rod 33, the air intake valve 34 is closed and the air flow cannot enter or exit. The electromagnetic valve plate 37 is opened, and the electromagnetic The gas stored above the valve plate 37 flows through the solenoid valve plate 37 to the cavity formed by the solenoid valve plate 37 and the air pressure block 38 below the solenoid valve plate 37. During the upward movement of the piston column 33, the solenoid valve plate 37 is closed. Then, under the action of multiple reciprocating processes of the piston column 33, the gas in the cavity formed between the solenoid valve plate 37 and the air pressure block 38 is compressed, and the air pressure increases. Under the action of high pressure, the air pressure block 38 is pushed to move to the bottom of the inner cavity of the stirring shaft tube 31. During the downward movement of the air pressure block 38, the auxiliary spring 39 is compressed. At the same time, the discharge pipe 214 is opened. The circulating extraction solvent flows into the stirring shaft tube 31 below the air pressure block 38 through the cooperation of the auxiliary tube 35 and the feed hole 36. When the air pressure block 38 moves downward, the extraction solvent at the bottom is squeezed, thereby causing the extraction solvent to push open the one-way joint on the discharge hole 310, and flows into the solution barrel 1 to mix with the mixed solution, thereby separating the photoresist and the PCB developer. After the extraction solvent is added, a vacuum pump is arranged outside the solution barrel 1 to extract the internal air, so that the interior is in a vacuum state, thereby avoiding the generation of bubbles inside the mixed solvent in the bottom cavity.

[0062] Through the setting of the auxiliary delivery stabilization mechanism 3, due to the different densities of the extraction solvent and the mixed solvent, with the cooperation of the discharge pipe 214, the auxiliary pipe 35 and the feed hole 36, the extraction solvent is directly delivered from top to bottom to the bottom of the solution barrel 1, and the extraction solvent is directly added to the mixed solution from the bottom. According to physical principles, liquids with different densities will produce stratification due to gravity in the same container. When the extraction solvent is injected into the mixed solution from the bottom, this density difference will trigger the natural flow of the liquid, the lighter one will float up and the heavier one will sink, thereby forming convection, and then with the help of the convection effect generated by the density difference between the extraction solvent and the mixed solution, the solvent can be quickly diffused at the bottom and mixed with the surrounding solution more quickly to reach a uniform state. Compared with delivering the solvent from the surface of the solution, it is more efficient and avoids the situation where a large number of bubbles are introduced due to the impact force of the solution and the contact with the air when the solvent is delivered from the surface, affecting the mixing effect, thereby affecting the subsequent separation process.

[0063] Please refer to the above working process Figures 7 to 9 .

[0064] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A positive and negative photoresist separation device for PCB developer recovery, comprising: A solution barrel (1), characterized in that an equal amount intermittent delivery mechanism (2) is provided on the solution barrel (1), and an auxiliary delivery stabilization mechanism (3) is provided below the equal amount intermittent delivery mechanism (2); The equal amount intermittent delivery mechanism (2) is used to intermittently deliver equal amounts of solvent for dissolving the developer and the photoresist into the solution barrel (1); The auxiliary delivery and stabilization mechanism (3) is used to assist in stabilizing the mixing of the solvent, the developer and the photoresist mixed solution and to prevent the solvent from volatilizing.

2. The positive and negative photoresist separation device for recovering PCB developer according to claim 1, characterized in that: The equal amount intermittent dispensing mechanism (2) comprises a support plate (21), the support plate (21) is fixedly connected to the solution barrel (1), one end of the support plate (21) is fixedly connected to a positioning plate (22), one side of the positioning plate (22) is fixedly connected to a driving motor (23), an output shaft of the driving motor (23) passes through the positioning plate (22) and is fixedly connected to a transmission member (24), and one end of the transmission member (24) away from the driving motor (23) is fixedly connected to a spur gear (25), a side of the spur gear (25) away from the transmission member (24) is meshingly connected with a counter gear (26), a side of the spur gear (25) close to the counter gear (26) is rotatably connected with a sleeve (27), an end of the sleeve (27) away from the spur gear (25) is fixedly connected to the counter gear (26), an outer ring of the sleeve (27) is sleeved with a buffer spring (28), and two ends of the buffer spring (28) are respectively fixedly connected to the spur gear (25) and the counter gear (26).

3. The positive and negative photoresist separation device for recovering PCB developer according to claim 2, characterized in that: The equal-amount intermittent delivery mechanism (2) also includes a buffer tube (29), the buffer tube (29) is fixedly connected to the middle part of the side of the reverse gear (26) away from the spur gear (25), the side of the buffer tube (29) away from the reverse gear (26) is fixedly connected to two buffer members (210), a positioning column (211) is slidably connected in the buffer tube (29), a through hole is provided in the positioning column (211), the buffer member (210) is slidably connected in the hole provided in the positioning column (211), the side of the positioning column (211) away from the buffer tube (29) is fixedly connected to a material transport tray (212), the outer ring of the material transport tray (212) is sleeved with an auxiliary shell (213), the side of the auxiliary shell (213) away from the material transport tray (212) is fixedly connected to the positioning plate (22), and the bottom of the auxiliary shell (213) is fixedly connected to a discharge pipe (214).

4. The positive and negative photoresist separation device for recovering PCB developer according to claim 2, characterized in that: The auxiliary delivery stabilization mechanism (3) comprises a stirring shaft tube (31), the stirring shaft tube (31) is rotatably connected to the bottom of the inner cavity of the solution barrel (1), the end of the stirring shaft tube (31) away from the solution barrel (1) is rotatably connected to the support plate (21), the end of the transmission member (24) away from the spur gear (25) is rotatably connected to a coupling member (32), the end of the coupling member (32) away from the transmission member (24) is fixedly connected to a piston column (33), the piston column (33) is slidably connected to the stirring shaft tube (31), the stirring shaft tube (31) is fixedly connected to an air intake valve (34), the outer ring of the stirring shaft tube (31) is rotatably connected to an auxiliary tube (35), and the stirring position of the auxiliary tube (35) is controlled by the auxiliary tube (35). A plurality of feed holes (36) are provided on the outer ring of the mixing shaft tube (31); the air inlet valve (34) is located below the auxiliary tube (35); a solenoid valve plate (37) is fixedly connected to the mixing shaft tube (31) between the piston rod (33) and the solenoid valve plate (37); a gas pressure block (38) slidably connected to the mixing shaft tube (31) is provided below the solenoid valve plate (37); an auxiliary spring (39) is fixedly connected to one end of the gas pressure block (38) away from the solenoid valve plate (37); one end of the auxiliary spring (39) away from the gas pressure block (38) is fixedly connected to the bottom of the inner cavity of the mixing shaft tube (31); and a plurality of discharge holes (310) are provided at the bottom of the mixing shaft tube (31) around the center of the mixing shaft tube (31).

5. The positive and negative photoresist separation device for PCB developer recovery according to claim 2, characterized in that: The support plate (21) is V-shaped and both ends of the support plate (21) are fixedly connected to the solution barrel (1), the positioning plate (22) is composed of two plates symmetrically arranged with the support plate (21) as the center, and the transmission member (24) is composed of two transmission wheels and a transmission belt sleeved outside the transmission wheels.

6. The positive and negative photoresist separation device for PCB developer recovery according to claim 3, characterized in that: Two buffer members (210) are symmetrically arranged with the center of the buffer tube (29) as the axis. The buffer members (210) are composed of a sliding column and a return spring. Two through holes on the positioning column (211) are symmetrically opened with the center of the positioning column (211) as the axis. The outer ring of the material transport plate (212) is provided with a plurality of grooves. The auxiliary shell (213) is composed of an upper lower hopper, a middle outer shell and a lower oblique discharge port. The material transport plate (212) is rotatably connected to the outer shell in the middle of the auxiliary shell (213). The auxiliary shell (213) is connected to the groove of the outer ring of the material transport plate (212) and the discharge pipe (214).

7. The positive and negative photoresist separation device for recovering PCB developer according to claim 4, characterized in that: The stirring shaft tube (31) is driven by a built-in motor, the coupling (32) is composed of two rotatably connected shafts, a hole is provided on the auxiliary tube (35) so that the inner cavity of the auxiliary tube (35) is connected to the discharge tube (214), the solenoid valve plate (37) is electrically connected to an external controller, an inner cavity is provided at one end of the air pressure block (38) close to the auxiliary spring (39), and a one-way clamp is provided on the discharge hole (310) so that it can only deflect outward of the stirring shaft tube (31).

8. A method for separating positive and negative photoresists for recovering PCB developer solution, applied to a positive and negative photoresist separation device for recovering PCB developer solution as described in any one of the solution barrels 1 to 7 of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Determine whether the photoresist used on the PCB is positive or negative based on the different chemical properties of the photoresist, analyze the type of photoresist, and then select the appropriate solvent; Step 2: According to the type of photoresist, a solvent is selected from common organic solvents, which has a high solubility for the photoresist and a low solubility for other substances such as a developer; Step 3: Put the PCB developer recovery mixture containing the photoresist into the solution barrel (1), and after the driving motor (23) is started, the spur gear (25) and the reverse gear (26) are cooperated to drive the material transport plate (212) to rotate, and the extraction solvent in the lower hopper in the auxiliary shell (213) is divided into equal amounts and intermittently transported to the oblique discharge port in the auxiliary shell (213). Under the action of the auxiliary shell (213) and the discharge pipe (214) arranged at the bottom of the stirring shaft tube (31), the extraction solvent directly flows to the bottom of the mixed solution in the solution barrel (1), and mixes with the PCB developer recovery mixture, so that the photoresist is fully dissolved in the extraction solvent; Step 4: After the mixing is completed, the photoresist is dissolved in the extraction solvent to form an extraction phase, and the density of the phase where other substances are located is different, so the mixed solution is allowed to stand in the solution barrel (1) for about one to two hours to allow the solution to be fully separated; Step 5: Use a separatory funnel or other separation equipment to release the extraction phase containing the photoresist from the bottom of the container or suck it out from the upper layer to separate it.

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