Graphene hole metallization pretreatment hole conditioning device

Abstract

The invention discloses a graphene hole metallization pretreatment hole conditioning device, and particularly relates to the technical field of PCB (Printed Circuit Board) substrate manufacturing, the graphene hole metallization pretreatment hole conditioning device comprises a hole conditioning box, two liquid collecting cavities are arranged in the hole conditioning box, and a feeding cavity, a hole conditioning cavity and a discharging cavity are sequentially arranged between the two liquid collecting cavities along the conveying direction of a PCB substrate; the horizontal conveying mechanism comprises a plurality of conveying rollers which are sequentially and horizontally arranged in the feeding cavity, the hole shaping cavity and the discharging cavity, transmission shafts are fixed to the front ends and the rear ends of the conveying rollers, shaft bodies, located in the liquid collecting cavity, of the transmission shafts are sleeved with liquid blocking discs, and a synchronous wheel-synchronous belt set is arranged between every two adjacent transmission shafts. The synchronous wheel-synchronous belt set is installed outside the hole conditioning box, pollution to hole conditioning liquid in the hole conditioning cavity is avoided, meanwhile, the liquid is blocked by generating the liquid level difference of the cavity and cooperating with the liquid blocking disc on the transmission shaft, zero leakage and zero abrasion of the transmission shaft are achieved, and the problem of corrosion leakage is thoroughly solved.

Description

Technical Field

[0001] This invention relates to the field of PCB substrate manufacturing technology, specifically to a pretreatment device for graphene hole metallization. Background Technology

[0002] Graphene pore metallization technology is considered an important alternative to traditional chemical copper plating due to its excellent deep plating capability and environmental friendliness. The pore preparation process is a key preliminary step in graphene pore metallization, and its purpose is to form a uniform adsorption layer of the pore preparation agent on the pore wall to ensure a dense coverage of graphene microsheets on the pore wall.

[0003] Currently, existing devices for purifying holes on PCB substrates, although the timing belt / gear is placed outside the purifying cavity, use magnetic drive or bellows sealing at the shaft through-hole. The sealing structure is complex and costly, and is prone to corrosion and leakage after long-term operation. Some devices use timing belts / gears made of engineering plastics, taking advantage of the corrosion resistance of engineering plastics to place the moving parts such as timing belts / gears inside the cavity. However, the moving parts such as timing belts / gears are immersed in the purifying liquid for a long time, resulting in plasticizer precipitation, rubber swelling and shedding. The debris enters the nozzle with the liquid circulation, causing secondary adsorption and contamination of the PCB. Summary of the Invention

[0004] The purpose of this invention is to provide a pretreatment device for metallizing graphene pores to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pretreatment device for graphene pore metallization, comprising: The hole-forming box has two liquid collection chambers. Between the two liquid collection chambers, along the PCB substrate conveying direction, there are sequentially arranged a feeding chamber, a hole-forming chamber, and a discharge chamber. Along the PCB substrate conveying path, the hole-forming box has sequentially arranged a first feeding port, a second feeding port, a first discharge port, and a second discharge port. A PLC controller is provided on the front side of the hole-forming box. The horizontal conveying mechanism includes multiple conveying rollers arranged horizontally in sequence in the feeding chamber, the forming chamber, and the discharging chamber. Both ends of the conveying rollers are fixed with drive shafts. The outer end of the drive shaft passes through the side wall of the forming chamber and is rotatably connected to the outer wall of the liquid collecting chamber. The shaft body of the drive shaft in the liquid collecting chamber is sleeved with a baffle plate. A synchronous pulley-synchronous belt group is provided between two adjacent drive shafts. The synchronous pulley-synchronous belt group is located on the rear side of the forming box. An ultrasonic array, comprising multiple ultrasonic transducers arranged in a rectangular array on the outer wall of the bottom of the cavity; The liquid circulation mechanism has its inlet end connected to the liquid collection chamber, feed chamber, and discharge chamber, while its outlet end is located within the orifice chamber, feed chamber, and discharge chamber. The limiting mechanism is installed inside the cavity.

[0006] Furthermore, the first feed inlet is located on the left side wall of the feed chamber, the second feed inlet and the first discharge outlet are located on the left and right side walls of the whole hole chamber respectively, and the second discharge outlet is located on the right side wall of the discharge chamber. The whole hole chamber is connected to the feed chamber and the discharge chamber through the second feed inlet and the first discharge outlet respectively. The first feed inlet, the second feed inlet, the first discharge outlet, and the second discharge outlet are all strip-shaped openings of the same size. The first feed inlet, the second feed inlet, the first discharge outlet, and the second discharge outlet are all located on the same horizontal plane. The top surface of the conveying roller is higher than the lower edge of the strip-shaped opening but lower than its center height, so that the PCB substrate can pass smoothly through each strip-shaped opening when it is conveyed on the conveying roller.

[0007] Furthermore, through holes are provided on the front and rear side walls of the cavity corresponding to the position of the drive shaft. The diameter of the through holes is larger than the diameter of the drive shaft, forming a fluid flow gap. Even if the shaft shakes slightly, it will not scrape the wall and avoid wear debris. The bottom surface of the conveyor roller is lower than the bottom edge of the strip opening, and the bottom surface of the conveyor roller is lower than the bottom edge of the through hole. The liquid level in the entire cavity is higher than the upper edge of the first feed inlet. The liquid level in the collection cavity, feed cavity, and discharge cavity is lower than the bottom surface of the conveying drum. Through the liquid level difference in the cavity, corrosion at the shaft seal is avoided, and liquid leakage along the shaft is also prevented. The diameter of the baffle plate is larger than that of the through hole. Multiple annular grooves are provided on the side of the baffle plate near the through hole. The baffle plate blocks the liquid flowing along the axis to prevent liquid leakage along the axis. The annular grooves enhance the centrifugal force to throw the liquid.

[0008] Furthermore, the top of the liquid collecting chamber, the feeding chamber, the orifice forming chamber, and the discharge chamber are all equipped with transparent chamber covers. The side walls of the liquid collecting chamber, the feeding chamber, the orifice forming chamber, and the discharge chamber are all equipped with liquid level detection components. The liquid level detection components include a rectangular tube sleeve, the top of which is equipped with a protective sleeve. An ultrasonic liquid level sensor is installed inside the protective sleeve. Multiple downward-sloping liquid passage pipes are installed on the side walls of the rectangular tube sleeve from top to bottom. The bottom of the uppermost liquid passage pipe is higher than the liquid level. The bottom of the rectangular tube sleeve is open and extends to the lower part of the cavity. The rectangular tube sleeve with an open bottom works in conjunction with multiple downward-sloping liquid passages to keep the liquid surface inside the rectangular tube sleeve calm. The violent fluctuations of the liquid outside the rectangular tube sleeve cause less fluctuation to the liquid surface inside the rectangular tube sleeve, thus enabling the ultrasonic liquid level sensor to effectively measure the liquid level height. The output of the ultrasonic liquid level sensor is electrically connected to the input of the PLC controller. The operating frequency of the ultrasonic array differs from the center frequency of the ultrasonic liquid level sensor by ≥2 kHz to avoid ultrasonic interference with liquid level detection. The ultrasonic liquid level sensor has a built-in 200 Hz narrowband filter to filter out ultrasonic harmonics and achieve high-precision liquid level detection.

[0009] Furthermore, the lower part of the hole-forming box is provided with a storage cavity, and the ultrasonic array is installed on the top wall of the storage cavity at a position corresponding to the hole-forming cavity area; The liquid circulation mechanism includes a filter group, a liquid pump, a liquid storage tank, and a circulation pump connected in sequence. The inlet of the filter group is connected to the liquid collection chamber, the feed chamber, and the discharge chamber through a pipe. The output end of the circulation pump is connected to a spray pipe network group and two spray pipe network groups. The filter group, liquid pump, liquid storage tank, and circulation pump are all installed in the receiving chamber. The spray pipe network group is installed at the bottom of the hole chamber, and the two spray pipe network groups are installed at the top of the feed chamber and the discharge chamber, respectively. The PLC controller is electrically connected to the liquid pump and the circulating pump.

[0010] Furthermore, the spraying network includes a main spraying pipe with multiple branch spraying pipes connected to it. The branch spraying pipes are spatially offset from the ultrasonic transducer to eliminate the shadow area of ​​the ultrasonic field. Multiple spraying heads are installed at equal intervals on the branch spraying pipes. The axis of the spraying head forms an angle of 30° to 60° with the direction of travel of the PCB substrate, spraying at an angle of 30° to 60° to form an upward flow of liquid, which enhances the flushing of the hole wall and the adsorption of the hole-forming agent. A first delivery pipe is connected between the circulation pump and the main spraying pipe. A first flow control valve is installed on the first delivery pipe. The PLC controller is electrically connected to the first flow control valve to facilitate the control of the amount of liquid sprayed from the spraying network.

[0011] Furthermore, the spray pipe network assembly includes two connecting plates, which are respectively connected to the front and rear side walls of the corresponding cavity. A spray pipe and a rectangular connecting rod are connected between the two connecting plates. Multiple spray heads are installed at equal intervals at the bottom of the spray pipe. A rectangular moving frame is slidably sleeved on the rectangular connecting rod. A first limiting cylinder is rotatably connected to the bottom of the rectangular moving frame. The lower end of the first limiting cylinder extends to the space between two adjacent conveying rollers. A first locking knob is threaded into the top of the rectangular moving frame. The bottom end of the first locking knob abuts against the surface of the rectangular connecting rod. The front and rear first limiting cylinders limit the edge of the PCB substrate to prevent the PCB substrate from moving laterally. Loosening the first locking knob makes it easy to adjust the distance between the front and rear first limiting cylinders, so as to adapt to PCB substrates of different widths. A second infusion pipe is connected between the circulating pump and the spray pipe. A second flow control valve is installed on the second infusion pipe. The PLC controller is electrically connected to the second flow control valve.

[0012] Furthermore, a suction pipe is connected between the inlet of the filter assembly and the bottom of the liquid collection chamber, the feed chamber, and the discharge chamber, respectively. A third flow control valve is installed on the suction pipe. The PLC controller is electrically connected to the third flow control valve, which makes the suction rate in the liquid collection chamber, the feed chamber, and the discharge chamber adjustable. In conjunction with the liquid level detection component, it ensures the stability of the liquid circulation. A replenishment pipe is connected to the top of the storage tank.

[0013] Furthermore, the horizontal conveying mechanism also includes multiple geared motors of the same model and power. The geared motors are connected to the rear end of the drive shaft through couplings. When the geared motors work, they drive the drive shaft to rotate. The rotation of the drive shaft drives the other drive shafts to rotate synchronously through the synchronous pulley-synchronous belt set, thereby making all the conveying rollers rotate synchronously. The output terminal of the PLC controller is electrically connected to the input terminal of the geared motor; The rear of the gearbox is equipped with a protective cover, which houses the geared motor and the synchronous pulley-synchronous belt assembly, thus protecting them.

[0014] Furthermore, the limiting mechanism includes two slide rails and two symmetrically arranged limiting components. The two slide rails are respectively fixed on the left and right side walls of the cavity. The limiting components include an adjusting plate. Multiple second limiting cylinders are rotatably connected to the bottom of the adjusting plate at equal intervals. The multiple second limiting cylinders are staggered with multiple conveying rollers in the cavity. A limiting plate is fixed to the upper part of the second limiting cylinder. The outer edge of the limiting plate is provided with an upwardly inclined lip. The second limiting cylinders on the two limiting components cooperate with each other to limit the edge of the PCB substrate and prevent the PCB substrate from moving laterally. The limiting plate presses the edge of the PCB substrate onto the conveying roller to prevent the edge of the PCB substrate from warping. The lip design can gradually press the warped PCB edge onto the surface of the conveying roller. Adjustment seats are provided above both ends of the adjustment plate. The adjustment seats have threaded channels that run through the upper and lower sides of the adjustment seat. A screw is nested in the threaded channel. The lower end of the screw is rotatably connected to the adjustment plate. A rotating head is fixed at the top of the screw. A second locking knob is nested in the threaded side wall of the adjustment seat away from the slide rail. The inner end of the second locking knob extends into the threaded channel and abuts against the surface of the screw. Loosening the second locking knob and then rotating the screw can adjust the height of the adjustment plate, thereby adjusting the height of the limit plate, which is convenient to adapt to PCB substrates of different thicknesses. A slide block is fixed on the side of the adjustment seat near the slide rail. The slide block is slidably mounted on the slide rail. A third locking knob is nested in the side wall of the slide block. The inner end of the third locking knob abuts against the surface of the slide rail. Loosening the third locking knob allows the adjustment seat to slide relative to the slide rail, thereby adjusting the distance between the two limiting components and adapting to PCB substrates of different widths.

[0015] The technical effects and advantages provided by the present invention in the above technical solution are as follows: 1. The synchronous pulley-synchronous belt assembly is installed outside the orifice box to avoid contamination of the orifice liquid inside the orifice chamber and to prevent corrosion of the synchronous pulley-synchronous belt assembly. The liquid level in the orifice chamber is higher than the upper edge of the first feed inlet, while the liquid level in the collection chamber, feed chamber, and discharge chamber is lower than the bottom of the conveyor roller, creating a liquid level difference in the chambers. This, combined with the liquid baffle on the drive shaft, blocks the liquid, achieving zero leakage and zero wear at the drive shaft and completely solving the corrosion and leakage problem. 2. By incorporating an ultrasonic transducer and a spray pipe network assembly, the axis of the spray head on the spray pipe network assembly forms an angle of 30° to 60° with the travel direction of the PCB substrate. The synergistic effect of ultrasonic waves and oblique spraying results in more uniform adsorption of the pore-forming agent on the pore wall, improving the consistency of the pores and providing a good foundation for subsequent graphene coating. 3. By installing liquid level detection components on the side walls of the liquid collection chamber, feeding chamber, orifice chamber, and discharge chamber, the liquid level in these chambers can be detected. The rectangular sleeve on the liquid level detection component works in conjunction with multiple downward-sloping liquid passage pipes to keep the liquid surface inside the rectangular sleeve calm. The violent fluctuations of the liquid outside the rectangular sleeve cause less fluctuation to the liquid surface inside the rectangular sleeve, thus enabling the ultrasonic liquid level sensor to effectively measure the liquid level height. The operating frequency of the ultrasonic array differs from the center frequency of the ultrasonic liquid level sensor by ≥2 kHz to avoid ultrasonic interference with liquid level detection. The ultrasonic liquid level sensor has a built-in 200 Hz narrowband filter to filter out ultrasonic harmonics, achieving high-precision liquid level detection. 4. By setting a limiting mechanism inside the hole cavity, the limiting mechanism supports the adjustment of width and thickness, adapts to various PCB specifications, prevents offset and warping, and the inclined lip design gradually presses the warped PCB edge to ensure a smooth hole filling process. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 A three-dimensional sectional view; Figure 3 This is a schematic diagram of the present invention after the protective cover has been removed; Figure 4 For the present invention Figure 3 Top sectional view; Figure 5 This is a three-dimensional sectional view of the hole box of the present invention; Figure 6 This is a schematic diagram of the conveyor roller of the present invention; Figure 7 This is a schematic diagram of the limiting mechanism of the present invention; Figure 8 For the present invention Figure 7 Enlarged schematic diagram of part A; Figure 9 This is a front sectional view of the present invention; Figure 10 This is a schematic diagram of the spray pipe network assembly of the present invention; Figure 11 This is a schematic diagram of the sprinkler network assembly of the present invention; Figure 12 This is a schematic diagram of the liquid level detection component of the present invention; Figure 13 This is a three-dimensional sectional view of the liquid level detection component of the present invention.

[0018] Explanation of reference numerals in the attached figures: 10. Hole-forming box; 11. Liquid collection chamber; 12. Feed chamber; 121. First feed inlet; 13. Hole-forming chamber; 131. Second feed inlet; 132. First discharge port; 133. Through hole; 14. Discharge chamber; 141. Second discharge port; 15. PLC controller; 16. Protective cover; 17. Liquid level detection assembly; 171. Rectangular tube sleeve; 172. Protective sleeve; 173. Ultrasonic liquid level sensor; 174. Liquid passage pipe; 18. Storage chamber; 20. Horizontal conveying mechanism; 21. Conveying roller; 22. Drive shaft; 23. Baffle plate; 231. Annular groove; 24. Synchronous pulley-synchronous belt assembly; 25. Gear motor; 30. Ultrasonic transducer; 40. Liquid circulation mechanism; 41. Filter assembly; 42. Liquid pump; 43. Liquid storage tank; 44. Circulation pump; 45. Spraying pipe network assembly; 451. Main spraying pipe; 452. Branch spraying pipe; 453. Spray head; 46. Spraying pipe network assembly; 461. Connecting plate; 462. Spraying pipe; 463. Rectangular connecting rod; 464. Spray head; 465. Rectangular moving frame; 466. First limiting cylinder; 467. First locking knob; 47. First infusion pipe; 471. First flow control valve; 48. Second infusion pipe; 481. Second flow control valve; 49. Suction pipe; 491. Third flow control valve; 50. Limiting mechanism; 51. Slide rail; 52. Adjusting plate; 53. Second limiting cylinder; 531. Limiting disc; 532. Lip; 54. Adjusting seat; 541. Screw; 542. Second locking knob; 55. Slide seat; 551. Third locking knob. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] This invention provides a pretreatment device for metallizing graphene pores, such as... Figures 1 to 6 As shown, it includes: The hole-forming box 10 has two liquid collection chambers 11 inside. Between the two liquid collection chambers 11, along the PCB substrate conveying direction, there are sequentially arranged a feeding chamber 12, a hole-forming chamber 13, and a discharge chamber 14. Along the PCB substrate conveying path, the hole-forming box 10 has sequentially arranged a first feeding port 121, a second feeding port 131, a first discharge port 132, and a second discharge port 141. A PLC controller 15 is provided on the front side of the hole-forming box 10. The horizontal conveying mechanism 20 includes multiple conveying rollers 21 arranged horizontally in sequence in the feeding chamber 12, the forming chamber 13, and the discharge chamber 14. Both ends of the conveying rollers 21 are fixed with drive shafts 22. The outer end of the drive shaft 22 passes through the side wall of the forming chamber 13 and is rotatably connected to the outer wall of the liquid collection chamber 11. The shaft body of the drive shaft 22 in the liquid collection chamber 11 is sleeved with a baffle plate 23. A synchronous pulley-synchronous belt group 24 is provided between two adjacent drive shafts 22. The synchronous pulley-synchronous belt group 24 is located on the rear side of the forming chamber 10. An ultrasonic array, comprising multiple ultrasonic transducers 30 arranged in a rectangular array on the bottom outer wall of the cavity 13; The liquid circulation mechanism 40 has its inlet end connected to the liquid collection chamber 11, the feed chamber 12, and the discharge chamber 14. The outlet end of the liquid circulation mechanism 40 is placed inside the hole chamber 13, the feed chamber 12, and the discharge chamber 14. Limiting mechanism 50 is installed inside the cavity 13.

[0021] The first feed inlet 121 is located on the left side wall of the feed chamber 12, the second feed inlet 131 and the first discharge outlet 132 are located on the left and right side walls of the whole hole chamber 13 respectively, and the second discharge outlet 141 is located on the right side wall of the discharge chamber 14. The whole hole chamber 13 is connected to the feed chamber 12 and the discharge chamber 14 through the second feed inlet 131 and the first discharge outlet 132 respectively. The first feed port 121, the second feed port 131, the first discharge port 132, and the second discharge port 141 are all strip-shaped openings of the same size. The first feed port 121, the second feed port 131, the first discharge port 132, and the second discharge port 141 are located in the same horizontal plane. The top surface of the conveying roller 21 is higher than the lower edge of the strip-shaped opening and lower than its center height, so that the PCB substrate can pass smoothly through each strip-shaped opening when it is conveyed on the conveying roller 21.

[0022] Through holes 133 are provided on the front and rear side walls of the cavity 13 corresponding to the position of the drive shaft 22. The diameter of the through holes 133 is larger than the diameter of the drive shaft 22, forming a fluid flow gap. Even if the shaft shakes slightly, it will not scrape the wall and avoid wear debris. The bottom surface of the conveyor roller 21 is lower than the lower edge of the strip opening, and the bottom surface of the conveyor roller 21 is lower than the lower edge of the through hole 133; The liquid level in the cavity 13 is higher than the upper edge of the first feed port 121. The liquid level in the collection cavity 11, feed cavity 12 and discharge cavity 14 is lower than the bottom surface of the conveying drum 21. The liquid level difference in the cavity avoids corrosion at the shaft seal and also prevents liquid leakage along the shaft. The diameter of the baffle plate 23 is larger than the diameter of the through hole 133. Multiple annular grooves 231 are provided on the side of the baffle plate 23 near the through hole 133. The baffle plate 23 blocks the liquid flowing along the axis to prevent liquid leakage along the axis. The annular grooves 231 enhance the centrifugal force to throw the liquid.

[0023] In this invention, the PCB substrate enters the feeding chamber 12 through the first feeding port 121, and then, under the conveying of multiple conveying rollers 21, passes through the second feeding port 131 into the hole-forming chamber 13, then passes through the first discharge port 132 into the discharge chamber 14, and finally is discharged through the second discharge port 141. The liquid level in the hole-forming chamber 13 is higher than the upper edge of the first feeding port 121. After the PCB substrate enters the hole-forming chamber 13, it is immersed in the hole-forming liquid. The ultrasonic array assists in strengthening the hole wall treatment on the PCB substrate. The liquid levels in the collection chamber 11, feed chamber 12, and discharge chamber 14 are all lower than the bottom surface of the conveying roller 21, creating a liquid level difference within the chambers. The liquid in the sump chamber 13 flows into the feed chamber 12 through the second feed port 131, and the liquid in the sump chamber 13 enters the discharge chamber 14 through the first discharge port 132. Simultaneously, the liquid in the sump chamber 13 flows into the collection chamber 11 through the through hole 133, and is then drawn in and filtered by the liquid circulation mechanism 40 before being re-input into the sump chamber 13, feed chamber 12, and discharge chamber 14 to maintain the liquid level within them. To maintain a constant liquid level difference in the cavity, the synchronous pulley-synchronous belt assembly 24 is located on the rear side of the orifice box 10. The shaft of the drive shaft 22, located in the liquid collection chamber 11, is fitted with a baffle plate 23. The baffle plate 23 blocks the liquid flowing along the shaft. The annular groove 231 on the baffle plate 23 enhances the centrifugal force to throw the liquid away, preventing liquid leakage along the shaft. The baffle plate 23 replaces the traditional shaft seal, achieving zero leakage and zero wear. At the same time, it completely isolates the synchronous pulley-synchronous belt assembly 24 from the orifice liquid, preventing contamination of the orifice liquid and solving the pain points of traditional devices such as seal failure and contamination circulation.

[0024] like Figure 4 , Figure 12 and Figure 13As shown, the top of the liquid collection chamber 11, the feeding chamber 12, the orifice 13, and the discharge chamber 14 are all provided with transparent chamber covers. The side walls of the liquid collection chamber 11, the feeding chamber 12, the orifice 13, and the discharge chamber 14 are all equipped with liquid level detection components 17. The liquid level detection components 17 include a rectangular tube sleeve 171. A protective sleeve 172 is installed on the top of the rectangular tube sleeve 171. An ultrasonic liquid level sensor 173 is installed inside the protective sleeve 172. Multiple inclined downward liquid passage pipes 174 are installed on the side wall of the rectangular tube sleeve 171 from top to bottom. The bottom of the uppermost liquid passage pipe 174 is higher than the liquid level. The bottom of the rectangular tube sleeve 171 is open and extends to the lower part of the cavity. The output terminal of the ultrasonic liquid level sensor 173 is electrically connected to the input terminal of the PLC controller 15. The operating frequency of the ultrasonic array differs from the center frequency of the ultrasonic liquid level sensor 173 by ≥2 kHz. The ultrasonic liquid level sensor 173 has a built-in 200Hz narrowband filter.

[0025] In this invention, the rectangular tube sleeve 171 with its open bottom cooperates with multiple downward-sloping liquid passage pipes 174 to make the liquid surface inside the rectangular tube sleeve 171 calm. The violent fluctuations of the liquid outside the rectangular tube sleeve 171 cause less fluctuation to the liquid surface inside the rectangular tube sleeve 171, thereby enabling the ultrasonic liquid level sensor 173 to effectively measure the liquid level height. The operating frequency of the ultrasonic array differs from the center frequency of the ultrasonic liquid level sensor 173 by ≥2 kHz to avoid ultrasonic interference with liquid level detection. The ultrasonic liquid level sensor 173 has a built-in 200 Hz narrowband filter to filter out ultrasonic harmonics and achieve high-precision liquid level detection.

[0026] like Figure 4 , Figure 5 , Figure 9 , Figure 10 and Figure 11 As shown, the lower part of the hole-forming box 10 is provided with a storage cavity 18, and the ultrasonic array is installed on the top wall of the storage cavity 18 at a position corresponding to the area of ​​the hole-forming cavity 13. The liquid circulation mechanism 40 includes a filter group 41, a liquid pump 42, a liquid storage tank 43, and a circulation pump 44 connected in sequence. The inlet of the filter group 41 is connected to the liquid collection chamber 11, the feed chamber 12, and the discharge chamber 14 through a pipe. The output end of the circulation pump 44 is connected to a spray pipe network group 45 and two spray pipe network groups 46. The filter group 41, the liquid pump 42, the liquid storage tank 43, and the circulation pump 44 are all installed in the receiving chamber 18. The spray pipe network group 45 is installed at the bottom of the hole chamber 13, and the two spray pipe network groups 46 are respectively installed at the top of the feed chamber 12 and the discharge chamber 14, so as to achieve filtration, circulation, and uniform distribution of the liquid in the hole. PLC controller 15 is electrically connected to liquid pump 42 and circulating pump 44.

[0027] The spray pipe network assembly 45 includes a main spray pipe 451, with multiple spray branch pipes 452 connected to the main spray pipe 451. The spray branch pipes 452 are spatially offset from the ultrasonic transducer 30 to eliminate the shadow area of ​​the ultrasonic field. Multiple spray heads 453 are installed at equal intervals on the spray branch pipes 452. The axis of the spray head 453 forms an angle of 30° to 60° with the direction of travel of the PCB substrate, spraying at an angle of 30° to 60° to form an upward flow of liquid, which enhances the flushing of the hole wall and the adsorption of the hole-forming agent. A first delivery pipe 47 is connected between the circulation pump 44 and the main spray pipe 451. A first flow control valve 471 is installed on the first delivery pipe 47. The PLC controller 15 is electrically connected to the first flow control valve 471 to facilitate the control of the amount of liquid sprayed from the spray pipe network assembly 45.

[0028] The spray pipe network assembly 46 includes two connecting plates 461, which are respectively connected to the front and rear side walls of the corresponding cavity. A spray pipe 462 and a rectangular connecting rod 463 are connected between the two connecting plates 461. Multiple spray heads 464 are installed at equal intervals at the bottom of the spray pipe 462. A rectangular moving frame 465 is slidably sleeved on the rectangular connecting rod 463. A first limiting cylinder 466 is rotatably connected to the bottom of the rectangular moving frame 465. The lower end of the first limiting cylinder 466 extends between two adjacent conveying rollers 21. A first locking knob 467 is threadedly nested at the top of the rectangular moving frame 465. The bottom end of the first locking knob 467 abuts against the surface of the rectangular connecting rod 463. The front and rear first limiting cylinders 466 limit the edge of the PCB substrate to prevent the PCB substrate from moving laterally. Loosening the first locking knob 467 makes it easy to adjust the distance between the front and rear first limiting cylinders 466, so as to adapt to PCB substrates of different widths. A second infusion pipe 48 is connected between the circulating pump 44 and the spray pipe 462. A second flow control valve 481 is installed on the second infusion pipe 48. The PLC controller 15 is electrically connected to the second flow control valve 481.

[0029] The filter assembly 41 is connected to the bottom of the liquid collection chamber 11, the feed chamber 12 and the discharge chamber 14 by a suction pipe 49. A third flow control valve 491 is installed on the suction pipe 49. The PLC controller 15 is electrically connected to the third flow control valve 491, so that the suction rate in the liquid collection chamber 11, the feed chamber 12 and the discharge chamber 14 is adjustable. In conjunction with the liquid level detection component 17, the stability of the liquid circulation is ensured. A replenishment pipe is connected to the top of the liquid storage tank 43.

[0030] In this invention, the liquid pump 42 operates, causing the liquid in the collection chamber 11, the feed chamber 12, and the discharge chamber 14 to enter the filter assembly 41 for filtration, then enter the storage tank 43, and is then fed into the spray pipe network assembly 46 and the spray pipe network assembly 45 by the circulation pump 44. The spray pipe network assembly 45 is located at the bottom of the hole-forming chamber 13. The spray pipe network assembly 45 sprays out the hole-forming liquid to replenish the hole-forming liquid in the hole-forming chamber 13. The axis of the spray head 453 on the spray pipe network assembly 45 forms an angle of 30° to 60° with the PCB substrate's travel direction, spraying obliquely at a 30° to 60° angle to form an upward oblique liquid flow, enhancing the scouring of the hole wall and the adsorption of the hole-forming agent. The two spray pipe network assemblies 46 are respectively installed on the upper part of the feed chamber 12 and the discharge chamber 14. The spray pipe network assembly 46 in the feed chamber 12 sprays out the hole-forming liquid through the spray head 464. The pore liquid pre-wets the PCB substrate to eliminate air bubbles during subsequent ultrasonic cavitation. The spray pipe network 46 in the discharge chamber 14 sprays the pore liquid through the spray head 464 to rinse the PCB substrate. The spray pipe network 46 is equipped with a first limiting cylinder 466. The front and rear first limiting cylinders 466 cooperate to limit the edge of the PCB substrate and prevent the PCB substrate from moving laterally. Loosening the first locking knob 467 makes it easy to adjust the distance between the front and rear first limiting cylinders 466, so as to accommodate PCB substrates of different widths. The PLC controller 15 controls the first flow control valve 471, the second flow control valve 481 and the third flow control valve 491 to control the liquid suction, liquid spraying and spraying flow rates respectively. The PLC controller 15 adjusts the liquid level feedback in real time to ensure the stability of the liquid level.

[0031] like Figure 1 , Figure 3 and Figure 4 As shown, the horizontal conveying mechanism 20 also includes multiple geared motors 25 of the same model and power, and the geared motors 25 are connected to the rear end of the transmission shaft 22 through a coupling; The output terminal of the PLC controller 15 is electrically connected to the input terminal of the geared motor 25; The rear side of the orifice box 10 is provided with a protective cover 16, and the geared motor 25 and the synchronous pulley-synchronous belt assembly 24 are both located inside the protective cover 16.

[0032] In this invention, the geared motor 25 operates to drive the transmission shaft 22 to rotate. The rotation of the transmission shaft 22 drives the other transmission shafts 22 to rotate synchronously through the synchronous pulley-synchronous belt group 24, thereby making all the conveying rollers 21 rotate synchronously to convey the PCB substrate. The geared motor 25 and the synchronous pulley-synchronous belt group 24 are both located inside the protective cover 16, which protects the geared motor 25 and the synchronous pulley-synchronous belt group 24.

[0033] like Figure 2 , Figures 7 to 9As shown, the limiting mechanism 50 includes two slide rails 51 and two symmetrically arranged limiting components. The two slide rails 51 are respectively fixed on the left and right side walls of the cavity 13. The limiting components include an adjusting plate 52. Multiple second limiting cylinders 53 are rotatably connected to the bottom of the adjusting plate 52 at equal intervals. The multiple second limiting cylinders 53 are staggered with the multiple conveying rollers 21 in the cavity 13. A limiting disk 531 is fixed to the upper part of the second limiting cylinder 53. The outer edge of the limiting disk 531 is provided with an upwardly inclined lip 532. Adjustment seats 54 are provided above both ends of the adjustment plate 52. Threaded channels are provided on the adjustment seats 54, penetrating both the upper and lower sides of the adjustment seat 54. A screw 541 is threadedly nested inside the threaded channels. The lower end of the screw 541 is rotatably connected to the adjustment plate 52. A rotating head is fixed to the top of the screw 541. A second locking knob 542 is threadedly nested on the side wall of the adjustment seat 54 away from the slide rail 51. The inner end of the second locking knob 542 extends into the threaded channel and abuts against the surface of the screw 541. A slide seat 55 is fixed on the side of the adjusting seat 54 near the slide rail 51. The slide seat 55 is slidably mounted on the slide rail 51. A third locking knob 551 is threadedly nested on the side wall of the slide seat 55. The inner end of the third locking knob 551 abuts against the surface of the slide rail 51.

[0034] In this invention, during the movement of the PCB substrate within the cavity 13, the second limiting cylinders 53 on the front and rear limiting components cooperate with each other to limit the edge of the PCB substrate and prevent the PCB substrate from moving laterally. The upper part of the second limiting cylinder 53 is fixed with a limiting disk 531, which presses the edge of the PCB substrate against the conveying roller 21 to prevent the edge of the PCB substrate from warping. The outer edge of the limiting disk 531 is provided with an upwardly inclined lip 532. The design of the lip 532 can gradually press the warped PCB edge onto the surface of the conveying roller 21. Loosen the second locking knob 542 and then rotate the screw 541 to adjust the height of the adjusting plate 52, thereby adjusting the height of the limiting plate 531 to accommodate PCB substrates of different thicknesses. Loosen the third locking knob 551 to release the lock on the slide 55, allowing the adjusting seat 54 to slide relative to the slide rail 51, thereby adjusting the distance between the two limiting components to accommodate PCB substrates of different widths.

[0035] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A graphene pore metalization pre-treatment hole processing device, characterized in that, The application relates to a PCB whole-hole processing device. The device comprises a whole-hole box (10) provided with two liquid collecting cavities (11), an inlet cavity (12), a whole-hole cavity (13) and an outlet cavity (14) arranged in sequence along the PCB substrate conveying direction between the two liquid collecting cavities (11), a first inlet (121), a second inlet (131), a first outlet (132) and a second outlet (141) arranged in sequence along the PCB substrate conveying path on the whole-hole box (10), and a PLC controller (15) arranged on the front side of the whole-hole box (10). A horizontal material conveying mechanism (20) comprises a plurality of conveying rollers (21) arranged in sequence horizontally in the inlet cavity (12), the whole-hole cavity (13) and the outlet cavity (14), and drive shafts (22) fixed to the front and rear ends of the conveying rollers (21), wherein the outer ends of the drive shafts (22) are rotatably connected to the side wall of the whole-hole cavity (13) and the outer wall of the liquid collecting cavity (11), the shaft body of the drive shaft (22) in the liquid collecting cavity (11) is sleeved with a liquid blocking disc (23), a synchronous wheel-synchronous belt set (24) is arranged between the adjacent two drive shafts (22), and the synchronous wheel-synchronous belt set (24) is located on the rear side of the whole-hole box (10). An ultrasonic array comprises a plurality of ultrasonic transducers (30) arranged in a rectangular array on the outer wall of the bottom of the whole-hole cavity (13). A liquid circulating mechanism (40) is connected in communication with the inlet cavity (12) and the outlet cavity (14) of the liquid collecting cavity (11) at the liquid inlet end, and is arranged in the whole-hole cavity (13), the inlet cavity (12) and the outlet cavity (14) at the liquid outlet end. A limiting mechanism (50) is arranged in the whole-hole cavity (13).

2. A graphene pore pre-treatment hole-filling device according to claim 1, characterized in that: The first inlet (121) is arranged on the left side wall of the inlet cavity (12), the second inlet (131) and the first outlet (132) are arranged on the left and right side walls of the whole-hole cavity (13) respectively, and the second outlet (141) is arranged on the right side wall of the outlet cavity (14). The first inlet (121), the second inlet (131), the first outlet (132) and the second outlet (141) are all strip-shaped inlets with the same size, and are arranged on the same horizontal plane, the top surface height of the conveying roller (21) is higher than the lower edge height of the strip-shaped inlet and lower than the central height of the strip-shaped inlet.

3. A graphene pore pre-treatment hole-filling device according to claim 2, characterised in that: The front and rear side walls of the whole-hole cavity (13) are provided with through holes (133) corresponding to the positions of the drive shafts (22), and the diameter of the through hole (133) is larger than the diameter of the drive shaft (22). The bottom surface height of the conveying roller (21) is lower than the lower edge height of the strip-shaped inlet, and the bottom surface height of the conveying roller (21) is lower than the lower edge height of the through hole (133). The liquid level in the whole-hole cavity (13) is higher than the upper edge of the first feeding port (121), and the liquid levels in the liquid collecting cavity (11), the feeding cavity (12) and the discharging cavity (14) are all lower than the bottom surface of the conveying drum (21); The diameter of the liquid blocking disc (23) is greater than that of the through hole (133), and a plurality of annular grooves (231) are arranged on the side of the liquid blocking disc (23) close to the through hole (133).

4. A graphene pore pre-treatment hole-filling device according to claim 1, characterized in that: The top of the liquid collecting cavity (11), the feeding cavity (12), the whole-hole cavity (13) and the discharging cavity (14) is provided with a transparent cavity cover, and the sidewall of the liquid collecting cavity (11), the feeding cavity (12), the whole-hole cavity (13) and the discharging cavity (14) is provided with a liquid level detection assembly (17), the liquid level detection assembly (17) comprises a rectangular tube sleeve (171), the top of the rectangular tube sleeve (171) is provided with a protective sleeve (172), the protective sleeve (172) is provided with an ultrasonic liquid level sensor (173), the sidewall of the rectangular tube sleeve (171) is sequentially provided with a plurality of downward inclined liquid passing pipes (174) from top to bottom, the bottom end of the uppermost liquid passing pipe (174) is higher than the liquid level, and the bottom of the rectangular tube sleeve (171) is open and extends to the lower part of the cavity; The output end of the ultrasonic liquid level sensor (173) is electrically connected with the input end of the PLC controller (15), the working frequency of the ultrasonic array is different from the center frequency of the ultrasonic liquid level sensor (173) by ≥2 kHz, and the ultrasonic liquid level sensor (173) is provided with a 200 Hz narrowband filter.

5. A graphene pore pre-treatment hole-filling device according to claim 1, characterized in that: The lower part of the whole-hole box (10) is provided with a receiving cavity (18), and the ultrasonic array is installed at the position of the top wall of the receiving cavity (18) corresponding to the whole-hole cavity (13) region; The liquid circulating mechanism (40) comprises a filter group (41), a liquid pump (42), a liquid storage tank (43) and a circulating pump (44) connected in sequence, the input port of the filter group (41) is connected with the liquid collecting cavity (11), the feeding cavity (12) and the discharging cavity (14) through a pipeline, the output end of the circulating pump (44) is connected with a liquid spraying pipe network group (45) and two spraying pipe network groups (46), the filter group (41), the liquid pump (42), the liquid storage tank (43) and the circulating pump (44) are all installed in the receiving cavity (18), the liquid spraying pipe network group (45) is installed at the bottom of the whole-hole cavity (13), and the two spraying pipe network groups (46) are respectively installed at the upper parts of the feeding cavity (12) and the discharging cavity (14). The PLC controller (15) is electrically connected with the liquid pump (42) and the circulating pump (44).

6. A graphene pore pre-treatment hole-filling device according to claim 5, characterised in that: The liquid spraying pipe network group (45) comprises a liquid spraying main pipe (451), a plurality of liquid spraying branch pipes (452) are connected to the liquid spraying main pipe (451), the liquid spraying branch pipes (452) are arranged in space staggered with the ultrasonic transducer (30), a plurality of liquid spraying heads (453) are installed on the liquid spraying branch pipes (452) at equal intervals, the axis of the liquid spraying head (453) forms an angle of 30°-60° with the direction of the PCB substrate, a first liquid conveying pipe (47) is connected between the circulating pump (44) and the liquid spraying main pipe (451), the first liquid conveying pipe (47) is provided with a first flow control valve (471), and the PLC controller (15) is electrically connected with the first flow control valve (471).

7. A graphene pore pre-treatment hole-filling device according to claim 5, characterized in that: The spray pipe network group (46) comprises two connecting plates (461), the two connecting plates (461) are connected with the front and rear side walls of the corresponding cavity, the front and rear connecting plates (461) are connected with a spray pipe (462) and a rectangular connecting rod (463), the bottom of the spray pipe (462) is provided with a plurality of spray heads (464) at equal intervals, the rectangular connecting rod (463) is slidably sleeved with a rectangular moving frame (465), the bottom of the rectangular moving frame (465) is rotatably connected with a first limiting cylinder (466), the lower end of the first limiting cylinder (466) extends between the adjacent two conveying rollers (21), the top of the rectangular moving frame (465) is threadedly nested with a first locking knob (467), and the bottom end of the first locking knob (467) abuts against the surface of the rectangular connecting rod (463); A second liquid conveying pipe (48) is connected between the circulating pump (44) and the spray pipe (462), the second liquid conveying pipe (48) is provided with a second flow control valve (481), and the PLC controller (15) is electrically connected with the second flow control valve (481).

8. A graphene pore pre-treatment hole-filling device according to claim 5, characterized in that: The input port of the filter group (41) is connected with the bottom of the liquid collecting cavity (11), the feed cavity (12) and the discharge cavity (14) through a liquid suction pipe (49), the liquid suction pipe (49) is provided with a third flow control valve (491), and the PLC controller (15) is electrically connected with the third flow control valve (491); The top of the liquid storage tank (43) is connected with a liquid supplementing pipe.

9. A graphene pore pre-treatment hole-filling device according to claim 1, characterized in that: The horizontal material conveying mechanism (20) further comprises a plurality of reduction motors (25) of the same type and power, the reduction motor (25) is connected with the rear end of the transmission shaft (22) through a shaft coupling; The output end of the PLC controller (15) is electrically connected with the input end of the reduction motor (25); The rear side of the whole hole box (10) is provided with a protective cover (16), and the reduction motor (25) and the synchronous wheel-synchronous belt group (24) are located in the protective cover (16).

10. A graphene pore pre-treatment hole-filling device according to claim 1, characterized in that: The limiting mechanism (50) comprises two slide rails (51) and two symmetrically arranged limiting assemblies. The two slide rails (51) are respectively fixed on the left and right side walls of the whole cavity (13). The limiting assembly comprises an adjusting plate (52). The bottom of the adjusting plate (52) is rotationally connected with a plurality of second limiting cylinders (53) at equal intervals. The plurality of second limiting cylinders (53) are staggered and spaced with a plurality of conveying rollers (21) in the whole cavity (13). The upper portion of the second limiting cylinder (53) is fixed with a limiting disc (531). The outer edge of the limiting disc (531) is provided with an upwardly inclined lip (532). The upper portion of the two ends of the adjusting plate (52) is provided with an adjusting seat (54). The adjusting seat (54) is provided with a threaded channel penetrating through the upper and lower sides of the adjusting seat (54). The threaded channel is screw-nested with a screw rod (541). The lower end of the screw rod (541) is rotationally connected with the adjusting plate (52). The top end of the screw rod (541) is fixed with a rotating head. The side wall of the adjusting seat (54) away from the slide rail (51) is screw-nested with a second locking knob (542). The inner end of the second locking knob (542) extends into the threaded channel and abuts against the surface of the screw rod (541). The side wall of the adjusting seat (54) close to the slide rail (51) is fixed with a sliding seat (55). The sliding seat (55) is slidingly installed on the slide rail (51). The side wall of the sliding seat (55) is screw-nested with a third locking knob (551). The inner end of the third locking knob (551) abuts against the surface of the slide rail (51).

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