Etching equipment for printed circuit board

Abstract

The present invention belongs to the technical field of circuit board etching, and in particular to an etching device for a printed circuit board, comprising a base, a U-shaped frame fixedly connected to the upper surface of the base, and a driving motor symmetrically installed on the surface of the base, three groups of fans are installed on the surface of the U-shaped frame, a baffle is symmetrically fixedly connected inside the U-shaped frame, and an etching liquid spray frame and a cleaning liquid spray frame arranged inside the U-shaped frame are also included, the etching liquid spray frame is used to spray etching liquid onto a substrate, and the cleaning liquid spray frame is used to spray cleaning liquid onto a substrate after etching, two groups of transmission chains are arranged in parallel inside the base, a plurality of transmission bars are equidistantly arranged between the transmission chains, a plurality of bucket-shaped suction nozzles are equidistantly arranged on the surface of the transmission bars, and the bucket-shaped suction nozzles are used to adsorb substrates to be etched, and while the present invention adsorbs the substrate by negative pressure, an air cushion is formed at the bottom of the substrate to prevent the etching liquid from contaminating the bottom of the substrate, and the etching liquid is recovered at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit board etching, and in particular relates to etching equipment for a printed circuit board. Background Art

[0002] Circuit board etching technology is a key process used to remove unwanted copper layers on copper foil clad boards by chemical or physical methods to form circuit patterns; this technology plays a vital role in electronic manufacturing and directly affects the accuracy and function of circuit boards;

[0003] Related etching equipment mostly uses a clamp to clamp the circuit board onto a conveyor for spraying. Although it meets the user's needs to a certain extent, there are still certain defects during use: for horizontally placed substrates, eddy currents are easily formed at the contact point between the clamp and the substrate, thereby affecting the etching effect of the copper foil on the surface of the circuit board. At the same time, the contact position between the clamp and the substrate may shield part of the circuit board, thereby affecting the etching of the circuit board. At the same time, the etching liquid gathered on the surface of the horizontally placed substrate slides along the surface of the substrate to the bottom of the substrate, thereby contaminating the bottom of the substrate and affecting the etching effect of the circuit board. Summary of the invention

[0004] The present invention provides an etching device for a printed circuit board, which can effectively solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an etching device for a printed circuit board, comprising a base, a U-shaped frame fixedly connected to the upper surface of the base, and a driving motor symmetrically installed on the surface of the base, three sets of fans are installed on the surface of the U-shaped frame, and baffles are symmetrically fixedly connected inside the U-shaped frame;

[0006] The base also includes an etching liquid spray rack and a cleaning liquid spray rack arranged inside the U-shaped rack, wherein the etching liquid spray rack is used to spray etching liquid onto the substrate, and the cleaning liquid spray rack is used to spray cleaning liquid onto the substrate after etching. Two sets of transmission chains are arranged in parallel inside the base, and a plurality of transmission bars are arranged equidistantly between the transmission chains. A plurality of bucket-shaped suction nozzles are arranged equidistantly on the surface of the transmission bars, and the bucket-shaped suction nozzles are used to absorb the substrate to be etched. A T-shaped air blowing pipe is arranged on the surface of the bucket-shaped suction nozzle, and the T-shaped air blowing pipe is used to blow air onto the substrate placed above it to form an air cushion so that the mist etching liquid in the air and the liquid etching liquid flowing on the surface of the substrate are It is not easy to be contaminated on the bottom surface of the substrate. A first recovery box and a second recovery box are respectively arranged between the two groups of transmission chains. The second negative pressure pump and the first negative pressure pump are respectively installed on the surfaces of the first recovery box and the second recovery box. The second negative pressure pump is used to absorb and recover the medium-concentration etching liquid generated after the etching reaction and generate negative pressure at the same time to make the substrate above the bucket-shaped suction nozzle be tightly adsorbed so as to maintain its stability during the etching process. The first negative pressure pump is used to recover the cleaning liquid after the substrate is cleaned and the low-concentration etching liquid mixed with residual etching liquid. Several groups of brush bodies are arranged under the two groups of transmission chains to clean the transmission bars so that the transmission bars can be recycled.

[0007] Furthermore, two groups of transmission gears are symmetrically arranged on the surface of the base, and the four transmission gears are rotatably connected to the circular grooves opened on the surface of the transmission gears through four bearings, and the ends of the two driving motor output shafts are respectively fixedly connected to one of the transmission gears in the two groups of transmission gears, and the transmission gears located on the same side are transmission-connected to the corresponding transmission chains, and the surface of each link of the transmission chain is respectively fixedly connected with a fixing plate, and a plurality of transmission bars are arranged between every two corresponding fixing plates, and the transmission bars are respectively fixedly connected to the two fixing plates, and the fixing plates are respectively slidingly connected to the corresponding baffles.

[0008] Furthermore, the bottom surface of the transmission bar is open, and a partition plate is fixedly connected to the inside of the transmission bar, and second connecting pipes are fixedly connected to the circular holes equidistantly opened on the surface of the partition plate, and a bucket-shaped suction nozzle is fixedly connected to the top of the second connecting pipe, and a first sealing ring is fixedly connected to the surface of the bucket-shaped suction nozzle. The second connecting pipe is located in the circular hole 2 opened on the surface of the transmission bar, and the T-shaped air blowing pipe is fixedly connected to the circular hole 2 opened on the surface of the transmission bar. The surface of the T-shaped air blowing pipe is evenly provided with first air holes, and the second connecting pipe is located inside the T-shaped air blowing pipe. The second connecting pipe is fixedly connected to the T-shaped air blowing pipe, and some of the bucket-shaped suction nozzles are provided with protective covers on their surfaces, and the bottom surface of the protective covers is fixedly connected to the second sealing ring, and the protective cover is threadedly connected to the bucket-shaped suction nozzle.

[0009] Furthermore, an etching liquid spray rack and a cleaning liquid spray rack are installed inside the U-shaped frame from right to left in sequence, a second U-shaped block is arranged between the etching liquid spray rack and the cleaning liquid spray rack, the second U-shaped block is fixedly connected to the inner wall of the U-shaped frame, and the second U-shaped block is located directly below the middle fan, a first U-shaped block and a third U-shaped block are arranged on both sides of the etching liquid spray rack and the cleaning liquid spray rack, the first U-shaped block and the third U-shaped block are respectively located directly below the two outer fans, the second U-shaped block, the first U-shaped block and the third U-shaped block are all U-shaped, and the first air gap is opened on the inner bottom surface of the three.

[0010] Furthermore, a hollow rectangular block is arranged between the second U-shaped block and the first U-shaped block, and a first connecting tube is symmetrically arranged on the surface of the hollow rectangular block, and the first connecting tube is fixedly connected to a circular hole three opened on the surface of the hollow rectangular block, and one end of the two first connecting tubes away from the hollow rectangular block is respectively fixedly connected to a circular hole four and a circular hole five opened on the surfaces of the second U-shaped block and the first U-shaped block, a second air gap is opened on the bottom surface of the hollow rectangular block, and a second round rod is symmetrically fixedly connected to the inside of the hollow rectangular block, and a plurality of rotating blocking blocks are equidistantly connected to the surface of the second round rod, and a pushing block is fixedly connected to a circular hole six opened on the upper surface of the transmission bar.

[0011] Furthermore, the first recovery box is located below the etching liquid spray rack, the transmission bar is slidably connected to the first recovery box, and four first mounting columns are fixedly connected to the surface of the first recovery box. The four first mounting columns are respectively fixedly connected to four first mounting circular grooves opened on the surface of the base, one of the first mounting columns is tubular, and the interior of the tubular first mounting column is connected to the interior of the first recovery box, and the second negative pressure pump is installed inside the tubular first mounting column.

[0012] Furthermore, the second recovery box is located below the cleaning liquid spray rack, the transmission bar is slidably connected to the second recovery box, and four second mounting columns are fixedly connected to the surface of the second recovery box, and the four second mounting columns are respectively fixedly connected to four second mounting circular grooves opened on the surface of the base, one of the second mounting columns is tubular, and the interior of the tubular second mounting column is connected to the interior of the second recovery box, the first negative pressure pump is installed inside the tubular second mounting column, and the surfaces of the first mounting column and the second mounting column are rotatably connected to support gears, and the support gears are meshed with the transmission chain.

[0013] Furthermore, a plurality of fixed baffles are arranged between the two corresponding fixed plates, the fixed baffles are arranged between the two adjacent transmission bars, the two long sides of the fixed baffles are respectively fixedly connected to the two transmission bars, the fixed baffles are slidably connected to the fixed plate through the short sides of the fixed baffles, a folding baffle is arranged between the two adjacent fixed plates, the long sides of the folding baffles are respectively fixedly connected to the two adjacent transmission bars, the short sides of the folding baffles are folded, the folding baffles are slidably connected to the two baffles through the short sides, and a plurality of recovery holes are evenly opened on the surface of the transmission bar, the recovery holes are located below the partition plate and close to the opening of the transmission bar.

[0014] Furthermore, a second spray rack is arranged below the two groups of transmission chains, and the second spray rack is installed inside the base. A number of brush bodies are equidistantly arranged below the two groups of transmission chains. A hollow round rod is arranged inside the brush body, and the brush body is fixedly connected to the surface of the hollow round rod. The end of the hollow round rod is rotatably connected to a power drum through bearing three and a rotating sealing ring. The power drum is fixedly connected to the base, and an impeller is rotatably connected inside the power drum. The hollow round rod is fixedly connected to the impeller, and a third connecting pipe is symmetrically arranged on the surface of the power drum. Two of the third connecting pipes are respectively fixedly connected to a through groove one opened on the surface of the power drum, and two adjacent third connecting pipes are fixedly connected. The end of the hollow round rod away from the power drum is open, and the power drum is connected to the interior of the second recovery box through the opening and the pipeline, and the third connecting pipe closest to the second spray rack is connected to the interior of the second spray rack through a pipeline.

[0015] Furthermore, a recovery pipe is fixedly connected in the second through groove formed on the surface of the second mounting column, and the bottom end of the recovery pipe extends to the inner bottom surface of the base, and the recovery pipe does not contact the base.

[0016] Compared with the prior art, the above solution of the present invention has at least the following beneficial effects:

[0017] By using a folding baffle, a fixed baffle and a transmission bar, a negative pressure can be generated inside the transmission bar, so that the bucket-shaped suction nozzle can adsorb the substrate, thereby fixing the substrate and recovering the etching liquid at the same time; by using a push block, a hollow rectangular block, a rotating blocking block and a second round rod, a positive pressure airflow can be blown out from the first air hole, thereby forming an air cushion on the bottom surface of the substrate, reducing the contamination of the bottom of the substrate by the etching liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the installation structure of the transmission gear in the present invention.

[0021] Figure 3 It is a schematic diagram of the installation structure of the first U-shaped block in the present invention.

[0022] Figure 4 It is a schematic diagram of the installation structure of the etching liquid spray rack in the present invention.

[0023] Figure 5 It is a schematic diagram of the installation structure of the first connecting pipe in the present invention.

[0024] Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle.

[0025] Figure 7 It is a schematic diagram of the installation structure of the second spray rack in the present invention.

[0026] Figure 8 It is a schematic diagram of the installation structure of the fixed baffle in the present invention.

[0027] Fig. 9 It is a schematic diagram of the installation structure of the protective cover in the present invention.

[0028] Fig.10 For the present invention Fig. 9 Enlarged view of point B in the middle.

[0029] Fig.11 For the present invention Figure 8 Enlarged view of point C in the middle.

[0030] Fig.12 It is a schematic diagram of the installation structure of the first installation column in the present invention.

[0031] Fig.13 It is a schematic diagram of the installation structure of the impeller in the present invention.

[0032] Fig.14 It is a schematic diagram of the installation structure of the recovery pipe in the present invention.

[0033] In the figure: 101, base; 102, U-shaped frame; 103, drive motor; 104, fan; 105, baffle; 201, transmission gear; 202, transmission chain; 203, fixing plate; 204, transmission bar; 205, first recycling box; 206, first installation column; 207, second recycling box; 208, second installation column; 209, first negative pressure pump; 210, second negative pressure pump; 211, etching liquid spray rack; 212, cleaning liquid spray rack; 213, second U-shaped block; 214, first U-shaped block; 215, third U-shaped block; 216, first connecting pipe; 217, hollow rectangular block; 21 8. Rotating blocking block; 219. Pushing block; 220. Partition plate; 221. Second connecting pipe; 222. Bucket-shaped suction nozzle; 223. First sealing ring; 224. T-shaped air blowing pipe; 225. Third connecting pipe; 226. First air hole; 227. Protective cover; 228. Second sealing ring; 229. Power drum; 230. Impeller; 231. Brush body; 232. Hollow round rod; 233. Recovery hole; 234. Folding baffle; 235. Recovery pipe; 240. Support gear; 241. Second spray rack; 243. Fixed baffle; 244. Second round rod; 2341. Horizontal part; 2342. Folding part. DETAILED DESCRIPTION

[0034] 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.

[0035] Example: Figures 1 to 14 As shown, the present invention provides a technical solution, a printed circuit board etching device, comprising a base 101, a U-shaped frame 102 fixedly connected to the upper surface of the base 101, and a drive motor 103 symmetrically installed on the surface of the base 101, three sets of fans 104 are installed on the surface of the U-shaped frame 102, and baffles 105 are symmetrically fixedly connected inside the U-shaped frame 102;

[0036] The base 101 further includes an etching liquid spray rack 211 and a cleaning liquid spray rack 212 arranged inside the U-shaped rack 102. The etching liquid spray rack 211 is used to spray etching liquid onto the substrate, and the cleaning liquid spray rack 212 is used to spray cleaning liquid onto the substrate after etching. Two sets of transmission chains 202 are arranged in parallel inside the base 101. A plurality of transmission bars 204 are arranged equidistantly between the transmission chains 202. A plurality of bucket-shaped suction nozzles 222 are arranged equidistantly on the surface of the transmission bars 204. The bucket-shaped suction nozzles 222 are used to absorb the substrate to be etched. A T-shaped air blowing pipe 224 is arranged on the surface of the bucket-shaped suction nozzle 222. The T-shaped air blowing pipe 224 is used to blow air onto the substrate placed above it to form an air cushion, so that the mist etching liquid in the air and the liquid etching liquid flowing on the surface of the substrate are not easily The bottom surface of the substrate is contaminated, and a first recovery box 205 and a second recovery box 207 are respectively arranged between the two groups of transmission chains 202. The surfaces of the first recovery box 205 and the second recovery box 207 are respectively installed with a second negative pressure pump 210 and a first negative pressure pump 209. The second negative pressure pump 210 is used to absorb and recover the medium-concentration etching liquid generated after the etching reaction and at the same time generate negative pressure so that the substrate above the bucket-shaped suction nozzle 222 is tightly adsorbed to maintain its stability during the etching process. The first negative pressure pump 209 is used to recover the cleaning liquid after the substrate is cleaned and the low-concentration etching liquid mixed with residual etching liquid. Several groups of brush bodies 231 are arranged under the two groups of transmission chains 202 to clean the transmission bar 204 so that the transmission bar 204 can be recycled.

[0037] like Figures 1 to 14 As shown, two groups of transmission gears 201 are symmetrically arranged on the surface of the base 101, and the four transmission gears 201 are rotatably connected in a circular groove opened on the surface of the transmission gear 201 through four bearings, and the ends of the output shafts of the two driving motors 103 are respectively fixedly connected to one of the transmission gears 201 in the two groups of transmission gears 201, and the transmission gears 201 located on the same side are transmission-connected to the corresponding transmission chains 202, and the surfaces of each link of the transmission chain 202 are respectively fixedly connected with fixed plates 203, and a number of transmission bars 204 are arranged between every two corresponding fixed plates 203, and the transmission bars 204 are respectively fixedly connected to the two fixed plates 203, and the fixed plates 203 are respectively slidably connected to the corresponding baffles 105.

[0038] like Figures 1 to 14As shown, the bottom surface of the transmission bar 204 is open, and a partition plate 220 is fixedly connected to the inside of the transmission bar 204. Second connecting pipes 221 are fixedly connected to the circular holes 1 equidistantly opened on the surface of the partition plate 220, and a bucket-shaped suction nozzle 222 is fixedly connected to the top of the second connecting pipe 221. The surface of the bucket-shaped suction nozzle 222 is fixedly connected to the first sealing ring 223. The second connecting pipe 221 is located in the circular hole 2 opened on the surface of the transmission bar 204. The T-shaped air blowing pipe 224 is fixedly connected to the circular hole 2 opened on the surface of the transmission bar 204. The surface of the T-shaped air blowing pipe 224 is evenly provided with first air holes 226. The second connecting pipe 221 is located inside the T-shaped air blowing pipe 224. The second connecting pipe 221 is fixedly connected to the T-shaped air blowing pipe 224, and a plurality of bucket-shaped suction nozzles 222 are provided with protective covers 227 on their surfaces. The bottom surface of the protective cover 227 is fixedly connected to the second sealing ring 228, and the protective cover 227 is threadedly connected to the bucket-shaped suction nozzle 222.

[0039] like Figures 1 to 14 As shown, an etching liquid spray rack 211 and a cleaning liquid spray rack 212 are sequentially installed inside the U-shaped frame 102 from right to left, a second U-shaped block 213 is arranged between the etching liquid spray rack 211 and the cleaning liquid spray rack 212, the second U-shaped block 213 is fixedly connected to the inner wall of the U-shaped frame 102, and the second U-shaped block 213 is located directly below the middle fan 104, a first U-shaped block 214 and a third U-shaped block 215 are arranged on both sides of the etching liquid spray rack 211 and the cleaning liquid spray rack 212, the first U-shaped block 214 and the third U-shaped block 215 are respectively located directly below the two outer fans 104, the second U-shaped block 213, the first U-shaped block 214 and the third U-shaped block 215 are all U-shaped, and the inner bottom surfaces of the three are all provided with a first air gap.

[0040] like Figures 1 to 14 As shown, a hollow rectangular block 217 is arranged between the second U-shaped block 213 and the first U-shaped block 214, and a first connecting tube 216 is symmetrically arranged on the surface of the hollow rectangular block 217. The first connecting tube 216 is fixedly connected to the circular hole three opened on the surface of the hollow rectangular block 217, and the ends of the two first connecting tubes 216 away from the hollow rectangular block 217 are respectively fixedly connected to the circular holes four and five opened on the surfaces of the second U-shaped block 213 and the first U-shaped block 214, a second air gap is opened on the bottom surface of the hollow rectangular block 217, and a second round rod 244 is symmetrically fixedly connected to the inside of the hollow rectangular block 217, and a plurality of rotating blocking blocks 218 are equidistantly connected to the surface of the second round rod 244, and a pushing block 219 is fixedly connected to the circular hole six opened on the upper surface of the transmission bar 204.

[0041] like Figures 1 to 14As shown, the first recovery box 205 is located below the etching liquid spray rack 211, the transmission bar 204 is slidably connected to the first recovery box 205, and four first mounting columns 206 are fixedly connected to the surface of the first recovery box 205. The four first mounting columns 206 are respectively fixedly connected to four first mounting circular grooves opened on the surface of the base 101. One of the first mounting columns 206 is tubular, and the interior of the tubular first mounting column 206 is connected to the interior of the first recovery box 205. A second negative pressure pump 210 is installed inside the tubular first mounting column 206.

[0042] like Figures 1 to 14 As shown, the second recovery box 207 is located below the cleaning liquid spray rack 212, the transmission bar 204 is slidably connected to the second recovery box 207, and four second mounting columns 208 are fixedly connected to the surface of the second recovery box 207. The four second mounting columns 208 are respectively fixedly connected to four second mounting circular grooves opened on the surface of the base 101, one of the second mounting columns 208 is tubular, and the interior of the tubular second mounting column 208 is connected to the interior of the second recovery box 207, and the interior of the tubular second mounting column 208 is installed with a first negative pressure pump 209, and the surfaces of the first mounting column 206 and the second mounting column 208 are rotatably connected to support gears 240, and the support gears 240 are meshed with the transmission chain 202.

[0043] like Figures 1 to 14 As shown, a plurality of fixed baffles 243 are arranged between the corresponding two fixed plates 203, and the fixed baffle 243 is arranged between two adjacent transmission bars 204. The two long sides of the fixed baffle 243 are respectively fixedly connected to the two transmission bars 204, and the fixed baffle 243 is slidably connected to the fixed plate 203 through the short side of the fixed baffle 243. A folding baffle 234 is arranged between the two adjacent fixed plates 203, and the long sides of the folding baffle 234 are respectively fixedly connected to the two adjacent transmission bars 204, and the short side of the folding baffle 234 is folded. The folding baffle 234 is slidably connected to the two baffles 105 through the short side. A plurality of recovery holes 233 are evenly opened on the surface of the transmission bar 204, and the recovery hole 233 is located below the partition plate 220 and close to the opening of the transmission bar 204.

[0044] like Figures 1 to 14As shown, a second spray rack 241 is arranged below the two groups of transmission chains 202, and the second spray rack 241 is installed inside the base 101. A plurality of brush bodies 231 are arranged equidistantly below the two groups of transmission chains 202. A hollow round rod 232 is arranged inside the brush body 231. The brush body 231 is fixedly connected to the surface of the hollow round rod 232. The end of the hollow round rod 232 is rotatably connected to a power drum 229 through a bearing three and a rotating sealing ring. The power drum 229 is fixedly connected to the base 101, and the inside of the power drum 229 is rotatably connected to an impeller 230. The hollow round rod 232 is fixedly connected to the impeller 230, and the third connecting pipe 225 is symmetrically arranged on the surface of the power drum 229. The two third connecting pipes 225 are respectively fixedly connected in a through groove 1 opened on the surface of the power drum 229. The two adjacent third connecting pipes 225 are fixedly connected. The end of the hollow round rod 232 away from the power drum 229 is open. The power drum 229 is connected to the interior of the second recovery box 207 through the opening and the pipeline. The third connecting pipe 225 closest to the second spray rack 241 is connected to the interior of the second spray rack 241 through the pipeline.

[0045] like Figures 1 to 14 As shown, a recovery pipe 235 is fixedly connected in the through groove 2 opened on the surface of the second mounting column 208 , and the bottom end of the recovery pipe 235 extends to the inner bottom surface of the base 101 , and the recovery pipe 235 does not contact the base 101 .

[0046] like Figures 1 to 14 As shown, it should be noted that: this device needs to be used in conjunction with an etching liquid pumping mechanism and a cleaning liquid pumping mechanism. The etching liquid pumping mechanism is connected to the liquid inlet of the etching liquid spray rack 211 through a pipeline, and the cleaning liquid pumping mechanism is connected to the cleaning liquid spray rack 212 and the pipe opening of the third connecting pipe 225 farthest from the second spray rack 241 through a pipeline. Its working principle and use process are well known in the prior art and will not be described in detail here.

[0047] The etching liquid spray rack 211, the cleaning liquid spray rack 212 and the second spray rack 241 are composed of a frame with a hollow interior, a liquid inlet installed on the surface of the frame and an atomizing nozzle evenly installed on the surface of the frame, and are used to spray atomized liquid;

[0048] The pipe connection mode of the present device is a common use mode of pipes, such as through threaded connection. When it is necessary to maintain a seal, a sealing gasket can be used in conjunction with it. When it is necessary to pass through the surface of the base 101 or the U-shaped frame 102, a reserved opening can be opened to allow the pipe to be fixedly connected thereto. The pipe connected to the open end of the hollow round rod 232 needs to use a rotating sealing ring and a bearing to cooperate with the rotation of the hollow round rod 232. This is well known in the prior art and will not be described in detail here.

[0049] The device can be used in conjunction with a loading machine. The loading machine can use a mechanical arm with a vacuum suction cup. The vacuum suction cup is used to absorb and move the substrate to the top of the transmission bar 204, and the substrate is placed in a set area. This is well known in the prior art and will not be described in detail here.

[0050] The folding baffle 234 maintains a certain rigidity in the axial direction of its long side, and is divided into a horizontal portion 2341 and a folding portion 2342 on its short side. The horizontal portion 2341 cannot be stretched, and the folding portion 2342 can rotate around the horizontal portion 2341 to complete the stretching of the folding baffle 234. At the same time, the folding baffle 234 in the folded state protrudes in the vertical upward direction to avoid scratching the first recycling box 205 and the first mounting column 206. The benefit of this arrangement is that the etching liquid falling on the surface of the folding baffle 234 will gather towards the transmission bars 204 on both sides so that it can be absorbed by the recovery holes 233 on the surface of the transmission bar 204;

[0051] The push block 219 is hemispherical in shape, and a through hole is formed on its surface so as to communicate with the interior of the transmission bar 204;

[0052] Small holes are evenly formed on the surface of the hollow round rod 232 , so that the negative pressure generated in the second recovery box 207 can adsorb the brush body 231 and accelerate the drying of the brush body 231 .

[0053] Working principle: Set the transmission gear 201 to rotate counterclockwise. Before starting work, the unnecessary bucket-shaped suction nozzle 222 can be covered with the protective cover 227 according to the size of the substrate to be etched. The threaded fit between the two and the sealing effect of the second sealing ring 228 and the first sealing ring 223 make the bucket-shaped suction nozzle 222 sealed inside the protective cover 227;

[0054] In this embodiment, when etching is performed, the substrate to be etched is placed in a fixed position above the horizontal conveying section of the bucket-shaped suction nozzle 222, and the two driving motors 103 are started at the same time to horizontally transmit the substrate from left to right. The etching liquid spraying rack 211 sprays the etching liquid through the etching liquid pumping mechanism, and the first negative pressure pump 209 and the second negative pressure pump 210 are started. During the transmission process of the transmission chain 202, the support gear 240 plays a supporting role to maintain the stability of the movement of the fixed plate 203, and the fan 104 is started;

[0055] In this embodiment, when the bucket-shaped suction nozzle 222 carrying the substrate to be etched moves to the top of the first recovery box 205, due to the covering of the transmission bar 204, the fixed baffle 243 and the folding baffle 234, the interior of the first recovery box 205 always generates a negative pressure. Under the action of the negative pressure, the second connecting pipe 221 on the partition plate 220 absorbs the substrate through the bucket-shaped suction nozzle 222 and the first sealing ring 223, so that the substrate remains stable during the conveying process. The substrate continues to be conveyed to the left, first passes through the first U-shaped block 214, and is blown by the rightmost fan 104, so that the etching liquid sprayed by the etching liquid spray rack 211 will not overflow to the right side of the first U-shaped block 214. When the substrate moves to the area between the first U-shaped block 214 and the second U-shaped block 213, its surface The surface is sprayed with etching liquid, and the reacted etching liquid is mixed with the etching liquid not sprayed on the substrate to form an etching liquid of medium concentration, which is respectively gathered on the surfaces of the fixed baffle 243 and the folding baffle 234. Under the action of the negative pressure of the first recovery box 205, the etching liquid is absorbed by the recovery hole 233 on the surface of the fixed baffle 243, and falls into the interior of the first recovery box 205 through the transmission bar 204. The etching liquid on the surface of the folding baffle 234 continuously flows to the transmission bars 204 on both sides through the guidance of the folding part 2342, and is finally absorbed by the recovery hole 233. The etching liquid falling into the first recovery box 205 is pumped out of the device by the second negative pressure pump 210. A recovery device can be installed at the first installation column 206 where the second negative pressure pump 210 is located to recover the etching liquid of medium concentration;

[0056] In this embodiment, after the etching of the substrate is completed, the second U-shaped block 213 blows away most of the etching liquid on its surface, reducing the corrosion of the substrate by the residual etching liquid. At the same time, it also prevents the etching liquid on the right side of the second U-shaped block 213 from overflowing to the left side of the second U-shaped block 213, causing waste. The substrate entering the left side of the second U-shaped block 213 is cleaned by the cleaning liquid sprayed by the cleaning liquid spray rack 212. At this time, the residual etching liquid mixed with the cleaning liquid enters the interior of the second recovery box 207 and is mixed into a low-concentration etching liquid, which is pumped out of the device by the first negative pressure pump 209. A recovery device can be installed at the pipe mouth of the second installation column 208 where the first negative pressure pump 209 is located to recover the low-concentration etching liquid;

[0057] In this embodiment, when the substrate moves between the first U-shaped block 214 and the second U-shaped block 213, the push block 219 on the surface of the transmission bar 204 enters the second air gap opened on the bottom surface of the hollow rectangular block 217. During this process, the push block 219 continuously lifts the rotating block 218 in contact with it, so that the air pumped by the fan 104 inside the second U-shaped block 213 and the first U-shaped block 214 enters the hollow rectangular block 217, and passes from the inside of the hollow rectangular block 217 through the first connecting pipe 216 into the transmission bar 204, above the partition plate 220, and part of the gas is discharged from the inside of the T-shaped blowing pipe 224 through the first air hole 226. This part of the air flow will form an air cushion on the bottom surface of the substrate, reducing the pollution of the mist etching solution and the liquid etching solution to the bottom of the substrate;

[0058] In this embodiment, the cleaning liquid pumping mechanism pumps cleaning liquid into the cleaning liquid spraying rack 212, so that the cleaning liquid spraying rack 212 sprays toward the substrate after etching to clean the substrate, and the substrate continues to move to the left. When the substrate moves to the left side of the third U-shaped block 215, no negative pressure is generated inside the bucket-shaped suction nozzle 222, and the substrate can be easily removed from the bucket-shaped suction nozzle 222. At this time, the substrate removal device can be processed for the next step; the bucket-shaped suction nozzle 222 of the removed substrate continues to move, and in the process of moving to the arc segment, the liquid remaining on the surfaces of the transmission bar 204, the fixed baffle 243 and the folding baffle 234 will gather and drip into the groove at the bottom of the U-shaped rack 102;

[0059] In this embodiment, the cleaning liquid pumping mechanism pumps cleaning liquid into the third connecting pipe 225, and the high-speed flowing cleaning liquid drives the impeller 230 inside the power drum 229 to rotate. The rotation of the impeller 230 drives the hollow round rod 232, and the cleaning liquid flowing from the third connecting pipe 225 to the second spray rack 241 is sprayed and cleaned on the surface of the bucket-shaped suction nozzle 222 and the transmission bar 204. After being wiped by the brush body 231, the first sealing ring 223 is kept in a wet state and moved to the horizontal section so that it can better adsorb the substrate. The low-concentration etching liquid accumulated in the bottom groove of the base 101 will be sucked away through the recovery pipe 235 by the negative pressure generated by the first negative pressure pump 209, thereby improving the recovery efficiency of the etching liquid;

[0060] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An etching device for a printed circuit board, comprising a base (101), a U-shaped frame (102) fixedly connected to the upper surface of the base (101), and a drive motor (103) symmetrically mounted on the surface of the base (101), three sets of fans (104) being mounted on the surface of the U-shaped frame (102), and a baffle (105) being symmetrically fixedly connected inside the U-shaped frame (102); Features: The invention also comprises an etching liquid spray rack (211) and a cleaning liquid spray rack (212) arranged inside the U-shaped rack (102), wherein the etching liquid spray rack (211) is used to spray etching liquid onto the substrate, and the cleaning liquid spray rack (212) is used to spray cleaning liquid onto the substrate after etching. Two sets of transmission chains (202) are arranged in parallel inside the base (101), a plurality of transmission bars (204) are arranged equidistantly between the transmission chains (202), a plurality of bucket-shaped suction nozzles (222) are arranged equidistantly on the surface of the transmission bars (204), the bucket-shaped suction nozzles (222) are used to absorb the substrate to be etched, a T-shaped air blowing pipe (224) is arranged on the surface of the bucket-shaped suction nozzle (222), and the T-shaped air blowing pipe (224) is used to blow air onto the substrate placed above the bucket-shaped suction nozzle to form an air cushion so that the mist etching liquid in the air and the liquid etching liquid flowing on the surface of the substrate are The etching liquid is not easy to be contaminated on the bottom surface of the substrate. A first recovery box (205) and a second recovery box (207) are respectively arranged between the two groups of transmission chains (202). A second negative pressure pump (210) and a first negative pressure pump (209) are respectively installed on the surfaces of the first recovery box (205) and the second recovery box (207). The second negative pressure pump (210) is used to absorb and recover the medium-concentration etching liquid generated after the etching reaction and generate negative pressure so that the substrate above the bucket-shaped suction nozzle (222) is tightly adsorbed to maintain its stability during the etching process. The first negative pressure pump (209) is used to recover the cleaning liquid after the substrate is cleaned and the low-concentration etching liquid mixed with residual etching liquid. A plurality of brush bodies (231) are arranged below the two groups of transmission chains (202) to clean the transmission bar (204) so ​​that the transmission bar (204) can be recycled. Two groups of transmission gears (201) are symmetrically arranged on the surface of the base (101); the four transmission gears (201) are rotatably connected to a circular groove (201) provided on the surface of the transmission gear (201) via four bearings; the ends of the output shafts of the two drive motors (103) are respectively fixedly connected to one of the transmission gears (201) in the two groups of transmission gears (201); the transmission gears (201) located on the same side are transmission-connected to the corresponding transmission chain (202); the surface of each link of the transmission chain (202) is respectively fixedly connected to a fixing plate (203); a plurality of transmission bars (204) are arranged between every two corresponding fixing plates (203); the transmission bars (204) are respectively fixedly connected to the two fixing plates (203); and the fixing plates (203) are respectively slidably connected to the corresponding baffles (105); The bottom surface of the transmission bar (204) is open, and a partition plate (220) is fixedly connected to the interior of the transmission bar (204). Second connecting pipes (221) are fixedly connected to circular holes equidistantly opened on the surface of the partition plate (220). A bucket-shaped suction nozzle (222) is fixedly connected to the top of the second connecting pipe (221). A first sealing ring (223) is fixedly connected to the surface of the bucket-shaped suction nozzle (222). The second connecting pipe (221) is located in circular hole 2 opened on the surface of the transmission bar (204). The T-shaped blowing pipe (224) is fixedly connected to the second circular hole. The surface of the T-shaped air blowing pipe (224) is uniformly provided with first air holes (226) in the circular hole 2 opened on the surface of the transmission bar (204); the second connecting pipe (221) is located inside the T-shaped air blowing pipe (224); the second connecting pipe (221) is fixedly connected to the T-shaped air blowing pipe (224); a protective cover (227) is provided on the surface of a plurality of the bucket-shaped suction nozzles (222); a second sealing ring (228) is fixedly connected to the bottom surface of the protective cover (227); and the protective cover (227) is threadedly connected to the bucket-shaped suction nozzle (222); An etching liquid spray rack (211) and a cleaning liquid spray rack (212) are sequentially installed inside the U-shaped frame (102) from right to left. A second U-shaped block (213) is arranged between the etching liquid spray rack (211) and the cleaning liquid spray rack (212). The second U-shaped block (213) is fixedly connected to the inner wall of the U-shaped frame (102). The second U-shaped block (213) is located directly below the fan (104) in the middle. A first U-shaped block (214) and a third U-shaped block (215) are arranged on both sides of the shower rack (211) and the cleaning liquid spray rack (212); the first U-shaped block (214) and the third U-shaped block (215) are respectively located directly below the two outer fans (104); the second U-shaped block (213), the first U-shaped block (214) and the third U-shaped block (215) are all U-shaped, and the bottom surfaces of the three blocks are all provided with a first air gap; A hollow rectangular block (217) is arranged between the second U-shaped block (213) and the first U-shaped block (214); a first connecting tube (216) is symmetrically arranged on the surface of the hollow rectangular block (217); the first connecting tube (216) is fixedly connected to a circular hole three opened on the surface of the hollow rectangular block (217); one end of the two first connecting tubes (216) away from the hollow rectangular block (217) is respectively fixedly connected to a circular hole four and a circular hole five opened on the surfaces of the second U-shaped block (213) and the first U-shaped block (214); a second air gap is opened on the bottom surface of the hollow rectangular block (217); a second round rod (244) is symmetrically fixedly connected inside the hollow rectangular block (217); a plurality of rotating blocking blocks (218) are equidistantly rotatably connected to the surface of the second round rod (244); and a push block (219) is fixedly connected to a circular hole six opened on the upper surface of the transmission bar (204); The first recovery box (205) is located below the etching liquid spray rack (211), the transmission bar (204) is slidably connected to the first recovery box (205), four first mounting columns (206) are fixedly connected to the surface of the first recovery box (205), and the four first mounting columns (206) are respectively fixedly connected to four first mounting circular grooves opened on the surface of the base (101), one of the first mounting columns (206) is tubular, and the interior of the tubular first mounting column (206) is connected to the interior of the first recovery box (205), and the second negative pressure pump (210) is installed inside the tubular first mounting column (206); The second recovery box (207) is located below the cleaning liquid spray rack (212); the transmission bar (204) is slidably connected to the second recovery box (207); four second mounting columns (208) are fixedly connected to the surface of the second recovery box (207); the four second mounting columns (208) are respectively fixedly connected to four second mounting circular grooves opened on the surface of the base (101); one of the second mounting columns (208) is tubular, and the interior of the tubular second mounting column (208) is connected to the interior of the second recovery box (207); the first negative pressure pump (209) is installed inside the tubular second mounting column (208); the surfaces of the first mounting column (206) and the second mounting column (208) are both rotatably connected to support gears (240); the support gears (240) are meshingly connected to the transmission chain (202); A plurality of fixed baffles (243) are arranged between two corresponding fixed plates (203), the fixed baffles (243) being arranged between two adjacent transmission bars (204), the two long sides of the fixed baffles (243) being respectively fixedly connected to the two transmission bars (204), the fixed baffles (243) being slidably connected to the fixed plate (203) via the short sides of the fixed baffles (243), a folding baffle (234) being arranged between two adjacent fixed plates (203), the long sides of the folding baffles (234) being respectively fixedly connected to the two adjacent transmission bars (204), the short sides of the folding baffles (234) being folded, the folding baffles (234) being slidably connected to the two baffles (105) via the short sides, a plurality of recovery holes (233) being evenly opened on the surface of the transmission bar (204), the recovery holes (233) being located below the partition plate (220) and close to the opening of the transmission bar (204); A second spray rack (241) is arranged below the two groups of transmission chains (202), and the second spray rack (241) is installed inside the base (101). A plurality of brush bodies (231) are arranged equidistantly below the two groups of transmission chains (202). A hollow round rod (232) is arranged inside the brush body (231), and the brush body (231) is fixedly connected to the surface of the hollow round rod (232). The end of the hollow round rod (232) is rotatably connected to a power drum (229) via a bearing three and a rotating sealing ring. The power drum (229) is fixedly connected to the base (101), and the inside of the power drum (229) is rotatably connected to an impeller (230). The hollow round rod (232) is fixedly connected to the impeller (230); a third connecting pipe (225) is symmetrically arranged on the surface of the power drum (229); two third connecting pipes (225) are respectively fixedly connected to a through groove 1 provided on the surface of the power drum (229); two adjacent third connecting pipes (225) are fixedly connected; an end of the hollow round rod (232) away from the power drum (229) is open; the power drum (229) is connected to the interior of the second recovery box (207) through the open end and a pipeline; and the third connecting pipe (225) closest to the second spray rack (241) is connected to the interior of the second spray rack (241) through a pipeline; A recovery pipe (235) is fixedly connected in the second through groove formed on the surface of the second mounting column (208), the bottom end of the recovery pipe (235) extending to the inner bottom surface of the base (101), and the recovery pipe (235) does not contact the base (101).

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