Waste liquid treatment device for PCB (printed circuit board) production

Abstract

The invention discloses a waste liquid treatment device for PCB production. The waste liquid treatment device comprises a pretreatment tank, the filter screen cylinder rotating assembly is arranged at the upper end of the pretreatment tank and comprises a filter screen cylinder and first rotating discs fixedly connected with the two ends of the filter screen cylinder in a sealed mode, the opposite sides of the two first rotating discs are concentrically and rotationally connected with a liquid adding pipe and a rotating shaft respectively, and the liquid adding pipe communicates with the filter screen cylinder; a plurality of discharging grooves are formed in the peripheral surface of the filter screen cylinder and close to the rotating shaft in an annular array mode, the filter screen cylinder can rotate around the axis of the filter screen cylinder, a second rotating disc is eccentrically and fixedly connected to the rotating shaft in a sleeving mode, and a supporting block capable of making rolling contact with the second rotating disc is fixedly connected to the outer side of the pretreatment groove. And the anti-blocking and neutralizing assembly comprises a spraying pipe arranged at the upper end of the filter screen cylinder. The invention can prevent solid particles from blocking the filter screen cylinder and cleaning the filter screen cylinder to influence the waste liquid treatment efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of PCB board production, and in particular to a waste liquid treatment device for PCB board production. Background Art

[0002] The reasons for the generation of waste liquid in the manufacturing process of PCBs mainly include the following aspects: In the manufacturing process of PCBs, acid and alkali solutions are usually used for cleaning and corrosion treatment. For example, in the etching process, an acid solution is used to remove the copper layer to form a circuit pattern. These acid and alkali solutions will become more corrosive after a period of use and can no longer be used, so they become waste liquids; Solvents may be used in PCB manufacturing to clean and remove surface pollutants. These solvents will carry various pollutants during the cleaning process, including organic matter, metal ions, etc., thus forming waste liquids. The volatility of the solvents will also cause them to gradually decrease during use and become waste liquids; In some cases, laser technology is used for PCB manufacturing, where laser etching can be used to remove unwanted metal layers or perform micro-machining. This process will generate waste liquids, which may contain metal particles and chemicals cut by the laser; Holes on PCB boards are usually completed by drilling, and the waste liquid generated during the drilling process may include a mixture of drill cuttings and cooling lubricants (for example, water or cutting fluids).

[0003] Since waste liquid contains acid, alkali or other chemical substances, as well as various solid particles, the waste liquid treatment device should include a waste liquid pretreatment unit to add appropriate neutralizers or adjusters to treat the acidity or pH value of the waste liquid, and install screens or solid-liquid separation devices to remove solid particles and suspended matter in the waste liquid. At present, flat screens are usually used. During long-term use, solid particles are trapped on or in the screen, affecting the filtration of the waste liquid. Only by suspending the addition of waste liquid and cleaning the filter first can the waste liquid treatment continue, which seriously reduces the waste liquid treatment efficiency.

[0004] Therefore, we propose a waste liquid treatment device for PCB board production to solve the above problems. Summary of the invention

[0005] The present invention is intended to provide a waste liquid treatment device for PCB board production to solve the problem that the prior art sets a flat screen and needs periodic cleaning, which affects the waste liquid treatment efficiency.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A waste liquid treatment device for PCB board production, comprising: Pretreatment tank; A filter screen drum rotating assembly is arranged at the upper end of the pretreatment tank, the filter screen drum rotating assembly comprises a filter screen drum and a first rotating disk which is sealed and fixedly connected to both ends of the filter screen drum, the opposite sides of the two first rotating disks are respectively connected with a liquid adding pipe and a rotating shaft in a concentric rotation, and the liquid adding pipe is connected with the filter screen drum, a plurality of discharge grooves are provided in an annular array on the outer peripheral surface of the filter screen drum and near the rotating shaft, the filter screen drum can rotate around its own axis, a second rotating disk is eccentrically fixedly sleeved on the rotating shaft, and a support block which can be in rolling contact with the second rotating disk is fixedly connected to the outer side of the pretreatment tank; The anti-blocking and neutralizing component comprises a spray pipe arranged at the upper end of the filter screen cylinder, and the spray pipe periodically sprays a neutralizing liquid at a high pressure on the filter screen cylinder.

[0007] Preferably, the filter screen drum rotating assembly also includes a support plate fixedly connected to the upper end of the pretreatment tank, and the liquid adding pipe is rotatably connected to the support plate, an L-shaped bracket is fixedly connected to the outer side of the pretreatment tank, and the bracket is rotatably connected to the liquid adding pipe, a rotating motor is fixedly installed on the upper end of the bracket, and a gear is fixedly connected to the output end of the rotating motor, and the gear is meshed with the first rotating disk.

[0008] Preferably, when the radial line of the second rotating disk farthest from the axis of the rotating shaft is in rolling contact with the support block, the filter screen cylinder is in a horizontal state.

[0009] Preferably, the anti-blocking and neutralization component also includes an acid-base box and a cylinder which are arranged in sequence along the extension direction of the filter screen cylinder, the acid-base box contains acid liquid or alkali liquid, an inner piston is airtightly and slidably connected to the cylinder, a partition is sealed and fixedly connected to the upper end of the cylinder, one end of the rotating shaft is rotatably connected to a support ear, the support ear and the lower end of the inner piston are hinged with a connecting rod, a one-way air inlet hole is provided in the inner piston and the partition, the upper end of the cylinder is connected to a compressed air pipe, and a pressure valve is installed in the compressed air pipe, the inner bottom of the acid-base box is provided with a liquid outlet pipe, the other end of the liquid outlet pipe extends to the inner top of the acid-base box and is connected to the spray pipe after two vertical bends.

[0010] Preferably, it also includes a collecting component, which includes a guide plate fixedly connected to the inner wall of the pretreatment tank and below the guide groove, and a collecting tank fixedly connected to the outer wall of the pretreatment tank and below the guide groove.

[0011] Preferably, a mixing assembly is further included, wherein the mixing assembly includes an electric stirrer, and the electric stirrer is fixedly connected to the filter screen cylinder via a fixing rod.

[0012] Preferably, the device is used to filter solid particles in waste liquid, and the maximum cross-sectional diameter of the solid particles is smaller than the width of the discharge trough.

[0013] Preferably, the acid-base box is provided with a sealing cover and is in an airtight state during operation of the device.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The support block in the device provides stable support for the second rotating disk. Since the second rotating disk is eccentrically fixedly connected to the rotating shaft and the bracket is rotatably connected to the liquid adding tube, and the filter screen cylinder can rotate freely relative to the liquid adding tube, the second rotating disk rotates along with the rotation of the filter screen cylinder, causing the radial point of contact between the second rotating disk and the second rotating disk to continuously change. While rotating, the filter screen cylinder performs periodic reciprocating swings within a certain angle range with the bracket and the liquid adding tube as the center, so that solid particles enter from the liquid adding tube under the action of gravity and gradually move toward the discharge groove until they fall out through the discharge groove, thereby preventing solid particles from clogging the filter screen cylinder and requiring cleaning, which affects the waste liquid treatment efficiency.

[0015] When the device uses the filter cylinder to filter solid particles in the wastewater, the rotating shaft drives the inner piston to rise and fall periodically along the extension direction of the cylinder through the support ear and the connecting rod, and continuously pressurizes the pressure chamber until the air pressure in the pressure chamber reaches the preset value of the pressure valve, and then it automatically opens. The high-pressure air pressure entering the acid and alkali tank will press the corresponding neutralizing liquid into the spray pipe through the liquid outlet pipe, thereby performing high-pressure spraying on the filter cylinder to further avoid blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural cross-sectional view of a waste liquid treatment device for PCB board production proposed by the present invention; Figure 2 for Figure 1 An enlarged structural diagram of the middle filter cylinder rotating assembly and the anti-blocking and neutralization assembly; Figure 3 for Figure 2 The enlarged structural diagram at A in the middle; Figure 4 This is a schematic structural diagram of a front view of a waste liquid treatment device for PCB board production proposed by the present invention.

[0017] In the figure: 1. pretreatment tank; 2. filter screen drum rotating assembly; 21. first rotating disk; 22. filter screen drum; 23. discharge tank; 24. support plate; 25. bracket; 26. gear; 27. rotating motor; 28. liquid adding pipe; 29. ​​rotating shaft; 210. second rotating disk; 211. support block; 3. anti-blocking and neutralization assembly; 31. acid and alkali box; 32. cylinder; 33. liquid outlet pipe; 34. spray pipe; 35. compressed air pipe; 36. inner piston; 37. ear; 38. connecting rod; 39. one-way air inlet hole; 310. partition; 4. collecting assembly; 41. guide plate; 42. outlet tank; 43. collecting tank; 5. mixing assembly; 51. electric agitator; 52. fixing rod. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] Reference Figures 1 to 4 A waste liquid treatment device for PCB board production includes a pretreatment tank 1, a filter screen cylinder rotating assembly 2 and an anti-blocking and neutralization assembly 3 arranged at the upper end of the pretreatment tank 1. The device uses a filter screen cylinder 22 to replace the common, flat-designed filter screen in the prior art by setting the filter screen cylinder rotating assembly 2 and the anti-blocking and neutralization assembly 3 to cooperate with each other. The filter screen cylinder 22 can be prevented from being blocked by solid particles under the combined action of its gravity and the centrifugal force of the filter screen cylinder 22, and can gradually move to the right. The anti-blocking and neutralization assembly 3 can periodically spray water at high pressure to remove solid particles blocked in the mesh of the filter screen cylinder 22. The details are as follows: The filter screen drum rotating assembly 2 comprises a filter screen drum 22 and a first rotating disk 21 which is sealed and fixedly connected to both ends of the filter screen drum 22. The opposite sides of the two first rotating disks 21 are respectively connected with a liquid adding pipe 28 and a rotating shaft 29 in a concentric rotation, and the liquid adding pipe 28 is communicated with the filter screen drum 22, and wastewater is introduced into the filter screen drum 22 through the liquid adding pipe 28. A plurality of discharge grooves 23 are provided in a circular array on the outer peripheral surface of the filter screen drum 22 and at a position close to the rotating shaft 29. The device is used to filter solid particles in the waste liquid, and the maximum cross-sectional diameter of the solid particles is smaller than the width of the discharge groove 23 to meet the demand for discharging solid particles. The filter screen drum 22 can rotate around its own axis, and a second rotating disk 210 is eccentrically fixedly sleeved on the rotating shaft 29. A support block 211 which can roll in contact with the second rotating disk 210 is fixedly connected to the outer side of the pretreatment tank 1. The eccentric rotation and the support of the support block 211 on the second rotating disk 210 cause one end of the filter screen drum 22 close to the discharge groove 23 to rise and fall periodically.

[0020] In the present device, the support block 211 provides stable support for the second rotating disk 210. Since the second rotating disk 210 is eccentrically fixedly connected to the rotating shaft 29 and the bracket 25 is rotatably connected to the liquid adding tube 28, and the filter screen cylinder 22 can rotate freely relative to the liquid adding tube 28, the second rotating disk 210 rotates along with the rotation of the filter screen cylinder 22, so that the radial point of contact between the second rotating disk 210 and the second rotating disk 210 is constantly changing. While rotating, the filter screen cylinder 22 performs periodic reciprocating swings within a certain angle range with the connection point between the bracket 25 and the liquid adding tube 28 as the center, so that the solid particles enter from the liquid adding tube 28 under the action of gravity and gradually move toward the discharge groove 23 until they fall out through the discharge groove 23.

[0021] The anti-blocking and neutralization component 3 includes a spray pipe 34 disposed at the upper end of the filter screen cylinder 22, and the spray pipe 34 periodically sprays the neutralizing liquid at high pressure to the filter screen cylinder 22. The device periodically sprays the neutralizing liquid to the upper end of the filter screen cylinder 22 to clear the blockage in the mesh of the filter screen cylinder 22.

[0022] In order to satisfy the purpose of rotating the filter screen drum 22 around its own axis, the following additional configuration is provided: the filter screen drum rotating assembly 2 also includes a support plate 24 fixedly connected to the upper end of the pretreatment tank 1, and the liquid adding pipe 28 is rotatably connected to the support plate 24, an L-shaped bracket 25 is fixedly connected to the outer side of the pretreatment tank 1, and the bracket 25 is rotatably connected to the liquid adding pipe 28, a rotating motor 27 is fixedly installed on the upper end of the bracket 25, a gear 26 is fixedly connected to the output end of the rotating motor 27, and the gear 26 is meshed with the first rotating disk 21, that is, the first rotating disk 21 is also a gear structure, and the rotating motor 27 transmits the torque to the filter screen drum 22 through the mutually meshing gear 26 and the first rotating disk 21. When the radial line of the second rotating disk 210 farthest from the axis of the rotating shaft 29 rolls in contact with the support block 211, the filter screen drum 22 is in a horizontal state, so that the end of the filter screen drum 22 close to the discharge tank 23 is the lower end during most of the cycle time.

[0023] In order to achieve the purpose of making the spray pipe 34 spray out the neutralizing liquid at high pressure periodically, the following additional arrangements are made: the anti-blocking and neutralizing component 3 also includes an acid-base box 31 and a cylinder 32 which are sequentially arranged along the extension direction of the filter screen tube 22. The acid-base box 31 contains acid or alkali liquid. The acid-base liquid is filled in the acid-base box 31 according to specific needs. Of course, a pH value detector or the like can be installed in the pretreatment tank 1 for real-time monitoring. The acid-base liquid can also be replaced with clean water. The acid-base box 31 is provided with a sealing cover and is in an airtight state during the operation of the device to ensure that the liquid fluid is driven by air pressure in the later stage.

[0024] An inner piston 36 is airtightly slidably connected in the cylinder 32, and a partition 310 is sealed and fixedly connected to the upper end of the cylinder 32. The partition 310 and the inner piston 36 divide the cylinder 32 into a pressure chamber and a transfer chamber from top to bottom, and are arranged to meet the rotation requirement of the rotating shaft 29: a support ear 37 is rotatably connected to one end of the rotating shaft 29, and a connecting rod 38 is hingedly connected to the support ear 37 and the lower end of the inner piston 36, and the connecting rod 38 is not affected by the rotation of the rotating shaft 29. A one-way air inlet hole 39 is provided in the inner piston 36 and the partition 310, and the upper end of the cylinder 32 is connected to a compressed air pipe 35, and a pressure valve is installed in the compressed air pipe 35. A liquid outlet pipe 33 is provided at the inner bottom of the acid-base tank 31, and the other end of the liquid outlet pipe 33 extends to the inner top of the acid-base tank 31 and is connected to the spray pipe 34 after two vertical bends.

[0025] In the process of using the filter cylinder 22 to filter solid particles in the wastewater, the rotating shaft 29 drives the inner piston 36 to rise and fall periodically along the extension direction of the cylinder 32 through the support ear 37 and the connecting rod 38. When the volume of the transfer chamber decreases, the air in the transfer chamber is pressed into the pressure chamber. When the volume of the transfer chamber increases, the outside air enters the transfer chamber through the one-way air inlet 39 until the air pressure in the pressure chamber reaches the preset value of the pressure valve and then automatically opens. The high-pressure air pressure entering the acid-base box 31 will press the corresponding neutralizing liquid into the spray pipe 34 through the liquid outlet pipe 33, thereby performing high-pressure spraying on the filter cylinder 22.

[0026] In order to collect the solid particles generated by filtration, the device is additionally provided with a collection assembly 4, which includes a guide slot 42 opened near the second rotating disk 210, a guide plate 41 fixedly connected to the inner wall of the pretreatment tank 1 and below the guide slot 42, and a collection slot 43 fixedly connected to the outer wall of the pretreatment tank 1 and below the guide slot 42. The solid particles falling out of the discharge slot 23 automatically fall into the guide plate 41, and under the guidance of the guide plate, pass through the guide slot 42 and are collected by the collection slot 43.

[0027] In order to improve the neutralization efficiency, the device is additionally provided with a mixing assembly 5, which includes an electric stirrer 51, and the electric stirrer 51 is fixedly connected to the filter screen cylinder 22 through a fixing rod 52. The electric stirrer 51 swings along with the fixing rod 52 to improve the neutralization efficiency.

[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A waste liquid treatment device for PCB board production, characterized in that: include Pretreatment tank (1); A filter screen drum rotating assembly (2) is arranged at the upper end of the pretreatment tank (1), the filter screen drum rotating assembly (2) comprising a filter screen drum (22) and a first rotating disk (21) sealed and fixedly connected to both ends of the filter screen drum (22), opposite sides of the two first rotating disks (21) are respectively connected to a liquid adding pipe (28) and a rotating shaft (29) in a coaxially rotating manner, and the liquid adding pipe (28) is connected to the filter screen drum (22), a plurality of discharge grooves (23) are provided in an annular array on the outer peripheral surface of the filter screen drum (22) and at a position close to the rotating shaft (29), the filter screen drum (22) can rotate around its own axis, a second rotating disk (210) is eccentrically fixedly sleeved on the rotating shaft (29), and a support block (211) that can roll in contact with the second rotating disk (210) is fixedly connected to the outer side of the pretreatment tank (1); The anti-blocking and neutralizing component (3) comprises a spray pipe (34) arranged at the upper end of the filter screen cylinder (22), and the spray pipe (34) periodically sprays a neutralizing liquid at a high pressure on the filter screen cylinder (22).

2. The waste liquid treatment device for PCB board production according to claim 1 is characterized in that: The filter screen drum rotating assembly (2) further comprises a support plate (24) fixedly connected to the upper end of the pretreatment tank (1), and the liquid adding pipe (28) is rotatably connected to the support plate (24); an L-shaped bracket (25) is fixedly connected to the outer side of the pretreatment tank (1), and the bracket (25) is rotatably connected to the liquid adding pipe (28); a rotating motor (27) is fixedly mounted on the upper end of the bracket (25); a gear (26) is fixedly connected to the output end of the rotating motor (27), and the gear (26) is meshed with the first rotating disk (21).

3. The waste liquid treatment device for PCB board production according to claim 1 is characterized in that: When the radial line of the second rotating disk (210) farthest from the axis of the rotating shaft (29) is in rolling contact with the support block (211), the filter screen cylinder (22) is in a horizontal state.

4. The waste liquid treatment device for PCB board production according to claim 1 is characterized in that: The anti-blocking and neutralization component (3) further comprises an acid-base box (31) and a cylinder (32) which are sequentially arranged along the extension direction of the filter screen cylinder (22); the acid-base box (31) contains acid or alkali solution; an inner piston (36) is airtightly slidably connected to the cylinder (32); a partition (310) is sealed and fixedly connected to the upper end of the cylinder (32); a support ear (37) is rotatably connected to one end of the rotating shaft (29); the support ear (37) is rotatably connected to the inner piston (36) ) are hingedly connected to a connecting rod (38), the inner piston (36) and the partition (310) are both provided with a one-way air inlet hole (39), the upper end of the cylinder (32) is connected to a compressed air pipe (35), and a pressure valve is installed in the compressed air pipe (35), the inner bottom of the acid-base box (31) is provided with a liquid outlet pipe (33), the other end of the liquid outlet pipe (33) extends to the inner top of the acid-base box (31), and is connected to the spray pipe (34) after being vertically bent twice.

5. The waste liquid treatment device for PCB board production according to claim 1 is characterized in that: It also comprises a collecting assembly (4), the collecting assembly (4) comprising a guide slot (42) opened near the second rotating disk (210), a guide plate (41) fixedly connected to the inner wall of the pretreatment tank (1) and below the guide slot (42), and a collecting slot (43) fixedly connected to the outer wall of the pretreatment tank (1) and below the guide slot (42).

6. The waste liquid treatment device for PCB board production according to claim 1 is characterized in that: It also comprises a mixing assembly (5), wherein the mixing assembly (5) comprises an electric stirrer (51), and the electric stirrer (51) is fixedly connected to the filter screen cylinder (22) via a fixing rod (52).

7. The waste liquid treatment device for PCB board production according to claim 1 is characterized in that: The device is used for filtering solid particles in waste liquid, and the maximum cross-sectional diameter of the solid particles is smaller than the width of the discharge trough (23).

8. The waste liquid treatment device for PCB board production according to claim 4 is characterized in that: The acid-base box (31) is provided with a sealing cover and is in an airtight state during the operation of the device.

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