A chemical conversion deplating device for printed circuit board chuck

Abstract

The present invention provides a chemical conversion stripping device for a printed circuit board chuck, which is used to solve the problem that the prior art has a poor stripping effect on the clamp during the continuous circulation operation of the electroplating line. The present invention provides a chemical conversion stripping device for a printed circuit board chuck, which includes: a line body support, a nitrate cleaning agent adding mechanism, two nitrate washing tanks, a clamp circulation transmission mechanism and a nitrate box. The nitrate cleaning agent adding mechanism is used to make nitrate cleaning agent and convey the finished nitrate cleaning agent into the nitrate box; the nitrate washing tank is used to receive the nitrate cleaning agent waste liquid in the nitrate box, filter the waste liquid, and circulate it into the nitrate box; the clamp circulation transmission mechanism is used to circulate and continuously drive the clamp to move; the nitrate box is used to carry the nitrate cleaning agent, and strip the clamp and its clamping point by using a chemical liquid stripping method, and can continuously spray clean liquid without impurities on the clamp, thereby ensuring the stripping effect of the clamp.

Description

Technical Field

[0001] The invention relates to the technical field of printed circuit board production and processing equipment, in particular to a chemical conversion deplating device for a printed circuit board chuck. Background Art

[0002] In the electroplating production process, the printed circuit board needs to be clamped and positioned by the fixture, pass through various copper plating treatment sections, and undergo various copper plating process treatments. During this process, the fixture is sprayed and immersed in the treatment liquid like the circuit board, and its external metal parts and clamping points will also be electroplated. The plating layer will cause poor conductivity when the fixture clamps the next batch of printed circuit boards, reduce the copper plating efficiency of the printed circuit boards, and affect the uniformity of their copper plating. Therefore, after one copper plating process is completed, the printed circuit board fixture needs to be de-plated before the next copper plating process can be run.

[0003] However, the prior art has a poor stripping effect on the clamp during the continuous operation of the electroplating line. On the one hand, the stripping effect is poor because the stripping is mostly done by immersing the liquid medicine. The fluidity of the liquid medicine is poor, and it is difficult to complete the timely circulation and replacement of the liquid medicine in the immersion tank. As the stripping of the chuck progresses, the impurities in the liquid medicine increase, which will affect the stripping effect of the chuck after the stripping. Moreover, the entire chuck is soaked in the liquid medicine for a long time, which will be excessively corroded by the liquid medicine, reducing the service life of the chuck. On the other hand, when the chuck is stripped, its clamping point is in a closed state, which makes it difficult to strip. The prior art mostly has a copper layer at the clamping point. When the accumulation reaches a certain thickness, the line is stopped, the clamp is removed from the line body, and the clamping point position is peeled and hung separately. This method is not only time-consuming and labor-intensive, but also seriously affects the processing efficiency of the electroplated line body. The coating at the clamping point position will still have an adverse effect on the conductivity of the printed circuit board, reducing the copper plating quality of the printed circuit board; finally, the prior art lacks a cleaning process for the clamp after deplating. The clamp is only circulated into the next batch of printed circuit boards through a high-acidity and high-corrosive liquid medicine pool. The residual liquid on the clamp is easy to burn the printed circuit board, seriously increasing the processing scrap rate. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a chemical conversion stripping device for a printed circuit board clamp, which is used to solve the problem of poor stripping effect of the clamp during the continuous operation of the electroplating line in the prior art.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a chemical conversion stripping device for a printed circuit board chuck, comprising: a wire support, a nitrate cleaning agent adding mechanism is installed on the left part of the wire support, two nitrate water washing tanks are installed on the right part of the wire support, a clamp circulation transmission mechanism is installed on the upper part of the wire support, and the clamp circulation transmission mechanism is a straight key type, circulating the clamp, a nitrate box is installed on the upper right part of the wire support, the clamp circulation transmission mechanism is arranged above the nitrate box, the clamp circulates through the nitrate box, the nitrate cleaning agent adding mechanism is connected to the nitrate water washing tank, and the nitrate water washing tank is connected to the nitrate box;

[0006] The nitrate cleaning agent adding mechanism is used to prepare the nitrate cleaning agent and transport the finished nitrate cleaning agent into the nitrate box;

[0007] The nitrate washing tank is used to receive the nitrate cleaning agent waste liquid in the nitrate box, filter the waste liquid, and circulate it into the nitrate box;

[0008] Wherein, the clamp circulation transmission mechanism is used to drive the clamp to move cyclically and continuously;

[0009] The nitrate box is used to carry nitrate cleaning agent, and utilizes chemical liquid stripping to strip and de-plating the fixture and its clamping points.

[0010] Optionally, the nitrate cleaning agent circulates in the left nitrate washing tank and the nitrate box, and hot water and cold water circulate in the right nitrate washing tank and the nitrate box.

[0011] Optionally, the nitrate washing tank includes a tank body, a waste liquid output pipe, a circulating branch pipe, a multistage pump, a filter and a reflux addition input pipe. The tank body is installed on the lower right part of the linear body bracket. A waste liquid chamber is arranged in the front part of the tank body, and a reflux storage chamber is arranged in the rear part of the tank body. The waste liquid chamber and the reflux storage chamber are divided into two left and right chambers. The four chambers are isolated from each other and not connected to each other. A waste liquid output pipe is arranged on the upper part of the waste liquid chamber, and a multistage pump is arranged on the right and bottom of the tank body. Three filters are installed on the upper wall of the tank body, and a circulating branch pipe is connected between the filter, the multistage pump and the waste liquid chamber. The filter, the multistage pump and the waste liquid chamber are connected to each other through the circulating branch pipe. The output end of the filter is connected to the reflux storage chamber, and a reflux addition input pipe is arranged on the upper part of the reflux storage chamber.

[0012] Optionally, the clamp circulation transmission mechanism includes a guide rail, a conveying steel belt, a copper flying target, a guide wheel, a chuck fixed end, a chuck rotating end and a limit spring. The guide rail is installed on the upper part of the linear support, and a conveying steel belt is provided for circulation transmission behind the guide rail. Copper flying targets are fixed equidistantly on the front wall of the conveying steel belt. Two guide wheels are provided on the upper part of each of the copper flying targets, and the upper guide wheel and the lower guide wheel are respectively in rotational contact with the inner side of the upper wall and the inner side of the lower wall of the guide rail. A chuck fixed end is provided on the left and right sides of the lower part of the copper flying target, and the chuck fixed end is installed on the lower part of the conveying steel belt. The chuck rotating end is rotatably mounted on the middle part of the chuck fixed end through a torsion spring and a bayonet, and a limit spring is installed between the inner sides of the upper parts of the chuck fixed end and the chuck rotating end.

[0013] Optionally, the saltpeter hanging box includes a saltpeter hanging front assembly group, a saltpeter hanging partition assembly group, a saltpeter hanging rear assembly group, a saltpeter hanging double water washing tank and a connecting mounting plate, and the saltpeter hanging front assembly group, the saltpeter hanging partition assembly group, the saltpeter hanging rear assembly group and the saltpeter hanging double water washing tank are arranged horizontally from left to right in sequence, and the saltpeter hanging front assembly group, the saltpeter hanging partition assembly group, the saltpeter hanging rear assembly group and the saltpeter hanging double water washing tank are interconnected through the connecting mounting plate.

[0014] Optionally, the nitrate hanging box further comprises a support plate, a splashproof water baffle plate, a limit water baffle plate and a seepage plate. The front wall and the inner side of the rear wall of the nitrate hanging front assembly group, the nitrate hanging partition assembly group and the nitrate hanging rear assembly group are equidistantly fixed with support plates, and the support plates on the inner side of the front wall and the inner side of the rear wall correspond vertically. The upper wall of the inner support plate of the front wall of the nitrate hanging front assembly group and the upper wall of the inner support plate of the rear wall of the nitrate hanging rear assembly group are respectively fixed with splashproof water baffle plates by bolts. The front splashproof water baffle plate and the rear splashproof water baffle plate are fixed with the upper wall of the inner support plate of the front wall and the inner support plate of the rear wall. A passage is reserved between the plates for the passage of the clamp, the left ends of the left pair of splash-proof water baffles and the right ends of the right pair of splash-proof water baffles are both provided with figure-eight openings, the lower parts of the left pair of support plates of the front assembly group of the saltpeter hanging and the lower parts of the right pair of support plates of the rear assembly group of the saltpeter hanging are both fixed with limit water baffles, a seepage plate is fixed between the bottoms of the two limit water baffles, and leakage holes are provided at both ends of the seepage plates corresponding to the positions of the front assembly group of the saltpeter hanging, the saltpeter hanging partition assembly group and the saltpeter hanging rear assembly group.

[0015] Optionally, the nitrate hanging box also includes a closed bottom plate, a concave confluence groove, a port sealing plate and a detergent inlet pipe. The bottom surfaces of the nitrate hanging front assembly group, the nitrate hanging partition assembly group, the nitrate hanging rear assembly group and the nitrate hanging double water washing tank are all installed with a closed bottom plate. A concave confluence groove is respectively arranged on the left part of the closed bottom plate of the nitrate hanging front assembly group and on the right part of the closed bottom plate of the nitrate hanging rear assembly group. Two concave confluence grooves are arranged in the middle part of the closed bottom plate of the nitrate hanging double water washing tank, and the bottoms of the two concave confluence grooves on the left are connected to the left nitrate hanging water washing tank through a waste liquid output pipe, and the bottoms of the two concave confluence grooves on the right are connected to the right nitrate hanging water washing tank through a waste liquid output pipe. The nitrate hanging water washing tank is connected, and the left end of the nitrate hanging front assembly group and the right end of the nitrate hanging rear assembly group are fixed with port sealing plates, and the two port sealing plates form the nitrate hanging front assembly group, the nitrate hanging partition assembly group and the nitrate hanging rear assembly group into a closed connecting tank, and the left and right ends of the nitrate hanging double water washing tank are also fixed with port sealing plates, and the nitrate hanging double water washing tank is formed into a connecting tank with closed ends, and the inner side of the front wall of the nitrate hanging front assembly group and the nitrate hanging rear assembly group is installed with a detergent input pipe, and the detergent input pipe is connected with the left nitrate hanging water washing tank through the reflux addition input pipe, and the left nitrate hanging water washing tank is connected with the nitrate hanging detergent adding mechanism.

[0016] Optionally, the gunpowder hanging box also includes a self-opening and closing guide block, and the self-opening and closing guide block is fixedly clamped between the support plates on the inner sides of the front walls of the gunpowder hanging front assembly group and the gunpowder hanging rear assembly group, and the self-opening and closing guide block is intermittently squeezed and contacted with the upper outer side of the rotating end of the chuck, and the rear wall of the self-opening and closing guide block is inclined toward the rear at a gradually increasing angle from left to right.

[0017] Optionally, the nitrate hanging box also includes an exhaust installation port, a top plate installation strip, a sliding observation window, a water washing manifold, a partition, a water washing jet square tube, a cold air spray dry tube and a steel belt limiting top plate. The front walls of the nitrate hanging front assembly group, the nitrate hanging partition assembly group and the nitrate hanging rear assembly group are each provided with an exhaust installation port. The front wall of the nitrate hanging double water washing tank is provided with two exhaust installation ports, and an exhaust pipe is installed on the exhaust installation port. Three top plate installation strips are fixed to the inner side of the left rear wall of the nitrate hanging double water washing tank, and the upper ends of the three top plate installation strips are spaced apart. A steel belt limiting top plate is fixed, two sliding observation windows are arranged on the left front wall of the nitrate hanging double water washing tank, two water washing collectors are fixed in the middle of the nitrate hanging double water washing tank, a partition is fixed on the bottom surface of the nitrate hanging double water washing tank between the two water washing collectors, water washing jet square pipes are fixed on the nitrate hanging double water washing tanks in front and behind the two water washing collectors, and the water washing jet square pipes are connected with the reflux addition input pipe of the right nitrate hanging water washing tank, and cold air spray drying pipes are installed on the inner side of the right front wall and the inner side of the rear wall of the nitrate hanging double water washing tank.

[0018] As described above, the chemical conversion stripping device for a printed circuit board chuck of the present invention has at least the following beneficial effects:

[0019] 1. The nitrate cleaning agent adding mechanism is connected to the nitrate washing tank, and the nitrate washing tank is connected to the nitrate box, so that the nitrate cleaning agent adding mechanism can provide liquid medicine to the nitrate washing tank, and the nitrate washing tank then inputs the liquid medicine into the nitrate box, receives the waste liquid for filtration, and then transports it to the nitrate box, so as to filter and circulate the liquid medicine, and continuously spray clean liquid medicine without impurities on the fixture, thereby ensuring the deplating effect of the fixture, and solving the problem that the liquid medicine in the immersion tank in the prior art is difficult to complete the timely circulation replacement, and as the chuck is deplated, the impurities in the liquid medicine increase, which will affect the deplating effect of the chuck after deplating;

[0020] 2. The nitrate hanging box is layered by setting the support plate, the limit water baffle plate and the seepage plate, which ensures that the liquid medicine after the spray will leak to the lower layer, and at the same time slows down the leakage speed of the liquid medicine to a certain extent, so that the liquid medicine can only overflow the clamping point of the fixture, so that the lower part of the fixture that is most affected by the previous circuit board coating process is soaked, and the coating stripping effect is ensured. At the same time, the upper part of the fixture will not be excessively corroded, and the service life of the chuck is guaranteed, which solves the problem of the entire chuck being soaked in the liquid medicine for a long time and being excessively corroded by the liquid medicine in the prior art;

[0021] 3. Through the setting of the self-opening and closing guide block, when the clamp moves from left to right, the rotating end of the clamp head can rotate to open the clamping point closed with the fixed end of the clamp head under the extrusion effect of the change in the shape of the outer wall of the self-opening and closing guide block, so that the clamping point position can be peeled and hung at the same time during the movement of the conveying mechanism, ensuring the peeling and hanging effect of the clamping point, so that the clamping point has good conductivity and high copper plating quality in the copper plating process of the printed circuit board, and is conducive to ensuring the processing efficiency of the electroplated wire body, solving the problem in the prior art that it is difficult to complete the peeling and hanging of the clamping point position during the operation of the wire body, which seriously affects the processing efficiency of the electroplated wire body;

[0022] 4. Through the setting of the double water washing tank for nitrate hanging, the fixture after the chemical stripping and hanging process can be cleaned by hot water washing, water washing and cold air drying, so that the fixture can be used for the next batch of printed circuit board copper plating after it is clean. There is no chemical liquid residue on the fixture to prevent burning of the printed circuit board. It has high installation performance and solves the problem of lack of cleaning process for the chuck after deplating in the prior art. The residual chemical liquid on the fixture is easy to burn the printed circuit board, which seriously increases the processing scrap rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional schematic diagram showing the overall structure of the chemical conversion stripping device for the printed circuit board chuck of the present invention from a southwest perspective.

[0024] Figure 2 Shown as the present invention Figure 1 A magnified view of the structure of region A.

[0025] Figure 3 It is a stereoscopic schematic diagram of the cooperation structure of the saltpeter washing tank, the clamp circulation transmission mechanism and the saltpeter box of the present invention from the southeast perspective.

[0026] Figure 4 It is a front view schematic diagram of the matching structure of the nitrate washing tank, the clamp circulation transmission mechanism and the nitrate box of the present invention.

[0027] Figure 5 It shows a right side schematic diagram of the matching structure of the nitrate washing tank, the clamp circulation conveying mechanism and the nitrate box of the present invention.

[0028] Figure 6 It is a stereoscopic schematic diagram of the nitrate washing tank structure of the present invention from the southeast perspective.

[0029] Figure 7 It is a stereoscopic schematic diagram of the trough structure of the present invention from a southeast perspective.

[0030] Figure 8 Shown is a right perspective schematic diagram of the tank structure of the present invention.

[0031] Fig. 9 Shown as the present invention Figure 3 A magnified view of the structure of region B.

[0032] Fig.10 Shown as the present invention Figure 3 A magnified view of the C region structure.

[0033] Fig.11 Shown as the present invention Figure 5 A magnified view of the D region structure.

[0034] Fig.12 It is a southeast perspective stereoscopic schematic diagram of the structure of the front assembly group of the nitrate hanger of the present invention.

[0035] Fig.13 Shown is a schematic top view of the structure of the pre-assembly group of the nitrate hanger of the present invention.

[0036] Fig.14 Shown is a front view schematic diagram of the structure of the nitrate hanging front assembly group of the present invention.

[0037] Fig.15 It is a right-side cross-sectional view of the left position of the nitrate hook front assembly group of the matching structure of the left end of the self-opening and closing guide block and the rotating end of the chuck of the present invention.

[0038] Fig.16 It shows a right side cross-sectional view of the right part of the nitre hanging front assembly group of the matching structure of the left part of the self-opening and closing guide block and the rotating end of the chuck of the present invention.

[0039] Fig.17 Shown is a right side structural perspective view of the self-opening and closing guide block of the present invention.

[0040] Fig.18 Shown is a southeast perspective stereoscopic schematic diagram of the saltpeter hanging partition assembly group structure of the present invention.

[0041] Fig.19 Shown is a top structural perspective view of the nitrate hanging partition assembly group of the present invention.

[0042] Fig. 20 Shown as the present invention Fig.19 A magnified view of the structure of region E in FIG.

[0043] Fig.21 Shown is a front structural perspective view of the nitrate hanging partition assembly group of the present invention.

[0044] Fig. 22 Shown is a right view structural schematic diagram of the saltpeter hanging partition assembly group of the present invention.

[0045] Fig.23 Shown is a front structural perspective view of the rear assembly group of the nitrate hanger of the present invention.

[0046] Fig.24 Shown is a top view of the structure of the rear assembly group of the nitrate hanger of the present invention.

[0047] Fig.25 Shown is a right-side structural perspective view of the rear-end assembly group of the present invention.

[0048] Fig.26 It is a stereoscopic schematic diagram of the double water washing tank structure of the nitrate hanging of the present invention from the southeast perspective.

[0049] Fig. 27 Shown is a perspective view of the top view of the double water washing tank for nitrate hanging according to the present invention.

[0050] Fig.28 Shown is a front structural perspective view of the nitrate hanging double water washing tank of the present invention.

[0051] Component number description

[0052] 1. Linear support;

[0053] 2. Nitrate cleaning agent adding mechanism;

[0054] 3. Nitrate washing tank; 301. Tank body; 3011. Waste liquid chamber; 3012. Reflux storage chamber; 302. Waste liquid output pipe; 303. Circulation branch pipe; 304. Multistage pump; 305. Filter; 306. Reflux addition input pipe;

[0055] 4. Clamp circulation transmission mechanism; 401. Guide rail; 402. Transmission steel belt; 403. Copper target; 404. Guide wheel; 405. Clamp fixed end; 406. Clamp rotating end; 407. Limit spring;

[0056] 5. Saltpeter hanging box; 501. Saltpeter hanging front assembly group; 502. Saltpeter hanging partition assembly group; 503. Saltpeter hanging rear assembly group; 504. Saltpeter hanging double water washing tank; 505. Connecting installation plate; 506. Support plate; 507. Splash-proof water baffle plate; 508. Limit water baffle plate; 509. Seepage plate; 510. Sealed bottom plate; 511. Concave confluence trough; 512. Self-opening and closing guide block; 513. Port sealing plate; 514. Detergent inlet pipe; 515. Exhaust installation port; 516. Top plate installation strip; 517. Sliding observation window; 518. Water washing confluence rack; 519. Partition plate; 520. Water washing spray square pipe; 521. Cold air spray dry pipe; 522. Steel belt limit top plate. DETAILED DESCRIPTION

[0057] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0058] As in the background technology, the prior art mostly uses liquid immersion deplating, the fluidity of the liquid is poor, and it is difficult to complete the timely circulation and replacement of the liquid in the immersion tank. As the deplating of the chuck progresses, the impurities in the liquid increase, which will affect the deplating effect of the post-deplating chuck; and the entire chuck is soaked in the liquid for a long time, which will be excessively corroded by the liquid, reducing the service life of the chuck;

[0059] In addition, when the clamp is stripped, the clamping point is in a closed state, making it difficult to complete the stripping. In the prior art, after the copper layer at the clamping point accumulates to a certain thickness, the line is stopped, the clamp is removed from the line body, and the stripping is performed at the clamping point alone. This method is not only time-consuming and labor-intensive, but also seriously affects the processing efficiency of the electroplated line body. The coating at the clamping point will also have an adverse effect on the conductivity of the printed circuit board, thereby reducing the copper plating quality of the printed circuit board.

[0060] Finally, the prior art lacks a cleaning process for the chuck after stripping. The fixture is simply cycled through a high-acid, high-corrosive solution pool to clamp the next batch of printed circuit boards. The residual solution on the fixture can easily burn the printed circuit boards, seriously increasing the processing scrap rate.

[0061] like Figure 1-Figure 28 As shown, in order to solve the above problems, the inventor transports the finished nitrate cleaning agent into the nitrate hanging box 5, and circulates the nitrate hanging cleaning agent in the left nitrate hanging water washing tank 3 and the nitrate hanging box 5, and circulates hot water and cold water in the right nitrate hanging water washing tank 3 and the nitrate hanging box 5, thereby completing the timely update of the chuck processing liquid in the nitrate hanging box 5 and ensuring the deplating effect of the chuck. Therefore, a rack cleaning agent mixing and adding device is invented, including:

[0062] A wire support 1, a nitrate cleaning agent adding mechanism 2 is installed on the left part of the wire support 1, two nitrate washing tanks 3 are installed on the right part of the wire support 1, a clamp circulation transmission mechanism 4 is installed on the upper part of the wire support 1, and the clamp circulation transmission mechanism 4 is a straight key type, circulating the clamp, a nitrate box 5 is installed on the upper right part of the wire support 1, the clamp circulation transmission mechanism 4 is arranged above the nitrate box 5, the clamp circulates through the nitrate box 5, the nitrate cleaning agent adding mechanism 2 is connected to the nitrate washing tank 3, and the nitrate washing tank 3 is connected to the nitrate box 5;

[0063] The nitrate cleaning agent adding mechanism 2 is used to prepare the nitrate cleaning agent and transport the finished nitrate cleaning agent into the nitrate box 5;

[0064] The nitrate washing tank 3 is used to receive the nitrate cleaning agent waste liquid in the nitrate box 5, filter the waste liquid, and circulate it into the nitrate box 5;

[0065] Among them, the clamp circulation transmission mechanism 4 is used to drive the clamp to move cyclically and continuously;

[0066] The nitrate box 5 is used to carry the nitrate cleaning agent, and to perform stripping and deplating on the fixture and its clamping points by using chemical liquid stripping.

[0067] During use of the present invention, after the clamp circulation transmission mechanism 4 drives the printed circuit board clamp to complete the copper plating process of the previous printed circuit board, it continues to drive the clamp from left to right through the nitrate hanging box 5, and the nitrate hanging detergent circulates in the left nitrate hanging water washing tank 3 and the nitrate hanging box 5, and hot water and cold water circulate in the right nitrate hanging water washing tank 3 and the nitrate hanging box 5. The nitrate hanging box 5 sequentially sprays the clamp with chemical solution for deplating, washes with hot water, washes with water and blows dry with cold air, thereby deplating the clamp. Example 1

[0068] See also Figure 1-Figure 8 and Figure 10-Figure 25In order to achieve the above-mentioned purpose and other related purposes, the present invention provides a rack cleaning agent mixing and adding device, including: a nitrate hanging water washing tank 3, a fixture circulation transmission mechanism 4, a nitrate hanging front assembly group 501, a nitrate hanging partition assembly group 502 and a nitrate hanging rear assembly group 503, the nitrate hanging water washing tank 3 includes a tank body 301, a waste liquid output pipe 302, a circulation branch pipe 303, a multi-stage pump 304, a filter 305 and a reflux addition input pipe 306, the tank body 301 is installed at the lower right part of the linear support 1, A waste liquid chamber 3011 is provided in the front part of the tank body 301, and a reflux storage chamber 3012 is provided in the rear part of the tank body 301, and the waste liquid chamber 3011 and the reflux storage chamber 3012 are divided into two left and right chambers, and the four chambers are isolated from each other and are not connected to each other. A waste liquid output pipe 302 is provided on the upper part of the waste liquid chamber 3011, and a multistage pump 304 is provided on the right and lower part of the tank body 301. Three filters 305 are installed on the upper wall of the tank body 301, and the filters 305, the multistage pump 304 A circulation branch pipe 303 is connected between the filter 305 and the waste liquid chamber 3011, and the filter 305, the multistage pump 304 and the waste liquid chamber 3011 are interconnected through the circulation branch pipe 303. The output end of the filter 305 is connected to the reflux storage chamber 3012. A reflux addition input pipe 306 is provided on the upper part of the reflux storage chamber 3012, so that the liquid leaking to the pre-nitrogen hanging assembly group 501, the post-nitrogen hanging assembly group 503 and the lower layer of the nitrogen hanging double water washing tank 504 can be converged into the concave confluence tank 511 , is input into the waste liquid chamber 3011 of the left nitrate hanging water washing tank 3 through the waste liquid output pipe 302, and then is input into the filter 305 through the circulation branch pipe 303 and the multi-stage pump 304 for waste liquid filtration. After the filtration is completed, it is finally input into the chamber of the reflux storage chamber 3012, and can be input into the detergent input pipe 514 or the water washing jet square pipe 520 through the reflux addition input pipe 306, so as to perform the filtering cycle of the liquid medicine, so as to continuously spray the clean liquid medicine without impurities on the fixture;

[0069] The clamp circulation transmission mechanism 4 includes a guide rail 401, a transmission steel belt 402, a copper target 403, a guide wheel 404, a clamp fixed end 405, a clamp rotating end 406 and a limit spring 407. The guide rail 401 is installed on the upper part of the linear support 1. The rear of the guide rail 401 is provided with a transmission steel belt 402 for circulation transmission. The front wall of the transmission steel belt 402 is equidistantly fixed with copper targets 403. Two guide wheels 404 are provided on the upper part of each copper target 403, and the upper The guide wheel 404 and the lower guide wheel 404 are respectively in rotational contact with the inner side of the upper wall and the inner side of the lower wall of the guide rail 401. The left and right sides of the lower part of the copper target 403 are provided with a chuck fixed end 405, and the chuck fixed end 405 is installed at the lower part of the conveyor steel belt 402. The middle part of the chuck fixed end 405 is rotatably mounted with a chuck rotating end 406 through a torsion spring and a bayonet pin. A limit spring 407 is installed between the upper inner sides of the chuck fixed end 405 and the chuck rotating end 406.

[0070] The nitrate hanging box 5 includes a nitrate hanging front assembly group 501, a nitrate hanging partition assembly group 502, a nitrate hanging rear assembly group 503, a nitrate hanging double water washing tank 504, a connecting installation plate 505, a support plate 506, a splash-proof water retaining plate 507, a limit water retaining plate 508, a seepage plate 509, a closed bottom plate 510, a concave confluence groove 511, a self-opening and closing guide block 512, a port sealing plate 513, a detergent input pipe 514 and an exhaust installation port 515. The nitrate hanging front assembly group 501, the nitrate hanging partition assembly group 502, the nitrate hanging rear assembly group 503 and the nitrate hanging double water washing tank 504 are arranged in a horizontal line from left to right in sequence. The nitrate hanging front assembly group 501, the nitrate hanging partition assembly group 502, the nitrate hanging rear assembly group 503 and the nitrate hanging double water washing tank 504 are connected by a connecting installation plate 505. The mounting plates 505 are interconnected, and support plates 506 are fixed equidistantly on the inner sides of the front and rear walls of the front assembly group 501, the partition assembly group 502 and the rear assembly group 503, and the support plates 506 on the inner sides of the front and rear walls correspond vertically. The upper walls of the inner support plates 506 of the front walls of the front assembly group 501 and the rear assembly group 503 are respectively fixed with splash-proof baffles 507 by bolts, and a channel for the passage of a clamp is reserved between the front splash-proof baffle 507 and the rear splash-proof baffle 507. During the spraying process of the liquid medicine, the splash-proof baffle 507 can shield the liquid medicine to prevent splashing. The left ends of the left pair of splash-proof baffles 507 and the right ends of the right pair of splash-proof baffles 507 are both provided with figure-eight-shaped baffles. The opening facilitates the entry and exit of the clamp, and the lower parts of the left end pair of support plates 506 of the front assembly group 501 of the nitrate hanging and the right end pair of support plates 506 of the rear assembly group 503 of the nitrate hanging are fixed with limited water retaining plates 508, and a seepage plate 509 is fixed between the bottoms of the two limited water retaining plates 508, and leakage holes are opened at both ends of the seepage plates 509 corresponding to the positions of the front assembly group 501 of the nitrate hanging, the nitrate hanging partition assembly group 502 and the nitrate hanging rear assembly group 503, which divide the front assembly group 501 of the nitrate hanging, the nitrate hanging partition assembly group 502 and the nitrate hanging rear assembly group 503 into two layers, upper and lower, while ensuring that the medicine liquid after the spraying will leak into the lower layer of the front assembly group 501 of the nitrate hanging, the leakage speed of the medicine liquid is slowed down to a certain extent, so that the medicine liquid of the front assembly group 501 of the nitrate hanging The accumulated liquid can only overflow the clamping point of the fixture, so that the lower part of the fixture most affected by the previous circuit board coating process is soaked, ensuring the dissolution effect of the copper film. The bottom surfaces of the pre-nitrification assembly group 501, the partition assembly group 502, the post-nitrification assembly group 503 and the double nitrification washing tank 504 are all installed with a closed bottom plate 510. The left part of the closed bottom plate 510 of the pre-nitrification assembly group 501 and the right part of the closed bottom plate 510 of the post-nitrification assembly group 503 are respectively provided with a concave confluence groove 511, which is conducive to the concentration of waste liquid, and the bottoms of the two concave confluence grooves 511 on the left are connected to the left nitrification washing tank 3 through the waste liquid output pipe 302. The left end of the pre-nitrification assembly group 501 and the right end of the post-nitrification assembly group 503 are fixed with a port sealing plate 513.The two port sealing plates 513 form a closed connecting groove with the nitrate hanging front assembly group 501, the nitrate hanging partition assembly group 502 and the nitrate hanging rear assembly group 503, and limit the lower layer of liquid medicine. The front wall inner side of the nitrate hanging front assembly group 501 and the nitrate hanging rear assembly group 503 is installed with a detergent input pipe 514, and the detergent input pipe 514 is connected with the left nitrate hanging water washing tank 3 through the reflux addition input pipe 306, and the left nitrate hanging water washing tank 3 is connected with the nitrate hanging detergent adding mechanism 2. The nitrate hanging detergent is circulated in the left nitrate hanging water washing tank 3 and the nitrate hanging box 5. The detergent input pipe 514 of the nitrate hanging front assembly group 501 inputs the liquid medicine and the liquid medicine circulating in the nitrate hanging water washing tank 3 are both high-concentration sulfuric acid. The detergent input pipe 514 of the nitrate hanging rear assembly group 503 inputs the liquid medicine and the liquid medicine circulating in the nitrate hanging water washing tank 3 They are all hydrogen peroxide. A self-opening and closing guide block 512 is fixedly connected between the support plate 506 on the inner side of the front wall of the nitrate hanging front assembly group 501 and the nitrate hanging rear assembly group 503, and the self-opening and closing guide block 512 is intermittently squeezed and contacted with the upper outer side of the chuck rotating end 406. The rear wall of the self-opening and closing guide block 512 is tilted to the rear at an angle gradually increasing from left to right, so that when the clamp moves from left to right, the chuck rotating end 406 of the clamp can be rotated to open the clamping point closed with the chuck fixed end 405 under the squeezing effect of the outer wall shape change of the self-opening and closing guide block 512. The front walls of the nitrate hanging front assembly group 501, the nitrate hanging partition assembly group 502 and the nitrate hanging rear assembly group 503 are all provided with an exhaust installation port 515, and an exhaust pipe is installed on the exhaust installation port 515 to facilitate the extraction of chemical waste gas and ensure the reaction environment of the liquid medicine peeling and hanging.

[0071] Specifically, the teeth in the middle of the conveyor steel belt 402 mesh with the conveyor sprocket of the wire body to drive the conveyor steel belt 402 to circulate in the wire body. During the transmission process, the guide wheel 404 rotates in contact with the guide rail 401, which can limit and assist in guiding the movement of the conveyor steel belt 402 so that it can steadily drive the clamp to move. Before the clamp enters the nitrate hanging box 5, the nitrate hanging detergent adding mechanism 2 first injects high-concentration sulfuric acid and hydrogen peroxide into the left and right chambers of the reflux storage chamber 3012 of the left nitrate hanging water washing tank 3 respectively. The high-concentration sulfuric acid is input into the detergent input pipe 514 of the nitrate hanging pre-assembly group 501 through the reflux addition input pipe 306. When the clamp circulation transmission mechanism 4 drives the printed circuit board clamp to enter the nitrate hanging pre-assembly When the clamp is in the group 501, as the clamp moves from left to right, the clamp rotating end 406 of the clamp rotates to open the clamping point closed with the clamp fixed end 405 under the squeezing effect of the outer wall shape change of the self-opening and closing guide block 512, and the detergent input pipe 514 continuously sprays high-concentration sulfuric acid on the clamp and its clamping point to dissolve the copper film on the clamp. During the spraying process, the splash-proof water baffle 507 can shield the liquid medicine to prevent splashing. Since the seepage plate 509 is only provided with leakage holes at both ends, and the limiting water baffle 508 and the support plate 506 of the nitrate hanging front assembly group 501 have a limiting effect on the liquid medicine, that is, while ensuring that the liquid medicine after the spraying will leak to the lower layer of the nitrate hanging front assembly group 501, it also slows down the liquid medicine to a certain extent. The leakage speed makes the accumulated liquid of the pre-assembly group 501 of the nitrate hanging only overflow the clamping point of the fixture, so that the lower part of the fixture most affected by the previous circuit board coating process is soaked, ensuring the dissolution effect of the copper film; the liquid that leaks to the lower layer of the pre-assembly group 501 of the nitrate hanging is converged into the concave confluence groove 511, and is input into the left waste liquid cavity 3011 of the left nitrate hanging water washing tank 3 through the waste liquid output pipe 302, and then is input into the filter 305 through the circulation branch pipe 303 and the multi-stage pump 304 for waste liquid filtration. After the filtration is completed, it is finally input into the left chamber of the reflux storage cavity 3012, and can be input into the detergent input pipe 514 of the pre-assembly group 501 of the nitrate hanging through the reflux addition input pipe 306. In this way, the liquid is filtered and circulated, so that clean liquid without impurities is continuously sprayed onto the fixture, ensuring the deplating effect of the fixture; the rear fixture circulation transmission mechanism 4 drives the printed circuit board fixture to continue to move to the right, pass through the nitrate hanging partition assembly group 502, and enter the nitrate hanging rear assembly group 503. The nitrate hanging rear assembly group 503 has the same spraying method and structure as the nitrate hanging front assembly group 501. The clamping point is opened inside it to accept the spraying of hydrogen peroxide, so that the coating on the surface of the fixture undergoes an oxidation-reduction reaction, thereby further stripping the coating. The nitrate hanging partition assembly group 502 can isolate the nitrate hanging front assembly group 501 and the nitrate hanging rear assembly group 503 to prevent the mixing of high-concentration sulfuric acid liquid and hydrogen peroxide liquid, thereby reducing the filtration burden. Example 2

[0072] See also Figure 1 , Figure 3-Figure 9 , Fig.11 and Figure 26-Figure 28 In order to achieve the above-mentioned purpose and other related purposes, the present invention provides a rack cleaning agent mixing and adding device, which also includes: a nitrate hanging double water washing tank 504, a nitrate hanging box 5 also includes a top plate mounting strip 516, a sliding observation window 517, a water washing confluence rack 518, a partition 519, a water washing jet square pipe 520, a cold air spray drying pipe 521 and a steel belt limiting top plate 522, and the front wall of the nitrate hanging double water washing tank 504 is provided with two exhaust installation ports 515, and an exhaust installation port 515 is installed with an exhaust The air duct can timely extract the waste gas generated in the clamp peeling reaction, providing a good working environment for the nitrate hanging box 5. Three top plate mounting strips 516 are fixed on the inner side of the left rear wall of the nitrate hanging double water washing tank 504. A steel belt limit top plate 522 is fixed between the upper ends of the three top plate mounting strips 516. Two sliding observation windows 517 are set on the left front wall of the nitrate hanging double water washing tank 504, so that the clamp circulation transmission mechanism 4 is in a relatively closed state when passing through the lower part of the steel belt limit top plate 522. The environment is prevented from being brought out by the liquid medicine, which may harm the health of the workers when they observe through the sliding observation window 517, and ensure safety. Two water washing confluence racks 518 are fixed in the middle of the nitrate hanging double water washing tank 504. The water washing confluence racks 518 are concave and can guide the water flow after flushing. A partition 519 is fixed on the bottom surface of the nitrate hanging double water washing tank 504 between the two water washing confluence racks 518. The partition 519 can prevent the hot water waste liquid and the cold water waste liquid from flowing into each other. The two water washing confluence racks 518 Water-washing jet square tubes 520 are fixed on the front and rear nitrate hanging double water washing tanks 504, and the water-washing jet square tubes 520 are connected to the reflux addition input pipe 306 of the right nitrate hanging water washing tank 3, so that the right nitrate hanging water washing tank 3 can continuously filter and circulate hot water and cold water into the nitrate hanging double water washing tank 504 through the two water-washing jet square tubes 520. Cold air spray drying pipes 521 are installed on the inner side of the right front wall and the inner side of the rear wall of the nitrate hanging double water washing tank 504 to blow dry the clamps after washing.

[0073] Furthermore, if Fig.26 and Fig.28 As shown, port sealing plates 513 are fixed to the left and right ends of the nitrate hanging double water washing tank 504, so that the nitrate hanging double water washing tank 504 is formed into a connecting tank with closed ends to prevent the water washing waste liquid from flowing into the liquid of the left nitrate hanging post-assembly group 503.

[0074] Furthermore, if Figure 1 and Figure 3-Figure 5 As shown, two concave confluence grooves 511 are arranged in the middle of the closed bottom plate 510 of the nitrate hanging double water washing tank 504, and the bottoms of the two right concave confluence grooves 511 are connected with the right nitrate hanging water washing tank 3 through the waste liquid output pipe 302. The circulation in the right nitrate hanging water washing tank 3 and the nitrate hanging box 5 is hot water and cold water, so that the nitrate hanging water washing tank 3 can provide hot water circulation to the left water washing jet square tube 520 and provide cold water circulation to the right water washing jet square tube 520.

[0075] Specifically, after the fixture completes the solution stripping process of the pre-nitrification assembly group 501 and the post-nitrification assembly group 503, the fixture circulation conveying mechanism 4 drives the printed circuit board fixture to continue to move to the right and enter the nitrification double water washing tank 504. When the conveying steel belt 402 drives the fixture to pass through the lower part of the steel belt limiting top plate 522, the worker can observe the deplating status of the fixture through the sliding observation window 517 to adjust the subsequent solution ratio and return the fixture to deplating. When the deplating effect of the fixture is good, the fixture circulation conveying mechanism 4 continues to drive the fixture to the right, passing through the upper part of the left water washing junction frame 518 and the upper part of the right water washing junction frame 518, and the left water washing jet square tube 520 first After the fixture is washed with hot water, the right water washing jet square tube 520 washes the fixture with cold water to flush away the residual liquid and peeling debris on the fixture. The water washing manifold 518 is concave to guide the water flow after flushing. The partition 519 also prevents the hot water and cold water from flowing into each other, ensuring the safety of filtration. The exhaust pipe on the exhaust installation port 515 can timely extract the waste gas generated in the peeling reaction of the fixture, providing a good working environment for the nitrate box 5. Finally, the fixture is blown dry by the cold air spray drying tube 521 before being used for the next batch of printed circuit board copper plating, so that the fixture is clean and free of liquid residue, which prevents burns to the printed circuit board and has high usability and installation performance.

[0076] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A chemical conversion stripping device for a printed circuit board chuck, characterized in that: include: A wire support (1), wherein a nitrate cleaning agent adding mechanism (2) is installed on the left side of the wire support (1), two nitrate washing tanks (3) are installed on the right side of the wire support (1), a fixture circulation transmission mechanism (4) is installed on the upper part of the wire support (1), and the fixture circulation transmission mechanism (4) is a straight key type, circulating the transmission fixture, a nitrate box (5) is installed on the upper right side of the wire support (1), the fixture circulation transmission mechanism (4) is arranged above the nitrate box (5), and the fixture circulates through the nitrate box (5), the nitrate cleaning agent adding mechanism (2) is connected to the nitrate washing tank (3), and the nitrate washing tank (3) is connected to the nitrate box (5); The nitrate cleaning agent adding mechanism (2) is used to prepare the nitrate cleaning agent and to transport the finished nitrate cleaning agent into the nitrate box (5); The nitrate washing tank (3) is used to receive the nitrate cleaning agent waste liquid in the nitrate box (5), filter the waste liquid, and circulate it into the nitrate box (5); Wherein, the clamp circulation transmission mechanism (4) is used to drive the clamp to move in a cyclic and continuous manner; The nitrate box (5) is used to carry nitrate cleaning agent, and to perform stripping and deplating on the fixture and its clamping points by using chemical liquid stripping; The saltpeter hanging box (5) comprises a saltpeter hanging front assembly group (501), a saltpeter hanging partition assembly group (502), a saltpeter hanging rear assembly group (503), a saltpeter hanging double water washing tank (504) and a connecting mounting plate (505); the saltpeter hanging front assembly group (501), the saltpeter hanging partition assembly group (502), the saltpeter hanging rear assembly group (503) and the saltpeter hanging double water washing tank (504) are arranged in a horizontal line from left to right in sequence, and the saltpeter hanging front assembly group (501), the saltpeter hanging partition assembly group (502), the saltpeter hanging rear assembly group (503) and the saltpeter hanging double water washing tank (504) are connected to each other via the connecting mounting plate (505); The saltpeter hanging box (5) further comprises a support plate (506), a splashproof water baffle plate (507), a limit water baffle plate (508) and a seepage plate (509). The support plates (506) are fixed equidistantly to the inner sides of the front wall and the rear wall of the saltpeter hanging front assembly group (501), the saltpeter hanging partition assembly group (502) and the saltpeter hanging rear assembly group (503), and the support plates (506) on the inner sides of the front wall and the inner sides of the rear wall correspond vertically. The upper walls of the inner support plates (506) of the front wall and the upper walls of the inner support plates (506) of the rear wall of the saltpeter hanging front assembly group (501) and the saltpeter hanging rear assembly group (503) are respectively fixed with splashproof water baffle plates (507) by bolts. The front splashproof water baffle plate (507) and the rear splashproof water baffle plate (508) are fixed to the upper walls of the inner support plates (506) of the front wall and the rear wall. A passage for a fixture to pass through is reserved between the water baffles (507), and the left ends of the left pair of splash-proof water baffles (507) and the right ends of the right pair of splash-proof water baffles (507) are both provided with an eight-shaped opening. The lower parts of the left pair of support plates (506) of the front assembly group (501) of the saltpeter hanging and the lower parts of the right pair of support plates (506) of the rear assembly group (503) of the saltpeter hanging are both fixed with a limited water baffle (508), and a seepage plate (509) is fixed between the bottoms of the two limited water baffles (508), and leakage holes are opened at both ends of the seepage plates (509) corresponding to the positions of the front assembly group (501), the partition assembly group (502) of the saltpeter hanging, and the rear assembly group (503).

2. The chemical conversion stripping device for a printed circuit board chuck according to claim 1, characterized in that: The left nitrate hanging water washing tank (3) and the nitrate hanging box (5) have a nitrate hanging cleaning agent circulating therein, and the right nitrate hanging water washing tank (3) and the nitrate hanging box (5) have hot water and cold water circulating therein.

3. The chemical conversion stripping device for a printed circuit board chuck according to claim 2, characterized in that: The nitrate washing tank (3) comprises a tank body (301), a waste liquid output pipe (302), a circulation branch pipe (303), a multistage pump (304), a filter (305) and a reflux addition input pipe (306). The tank body (301) is installed at the lower right part of the linear support (1). A waste liquid chamber (3011) is arranged in the front part of the tank body (301), and a reflux storage chamber (3012) is arranged in the rear part of the tank body (301). The waste liquid chamber (3011) and the reflux storage chamber (3012) are each divided into two left and right chambers. The four chambers are isolated from each other and are not connected to each other. The upper part of the waste liquid chamber (3011) is provided with a A waste liquid output pipe (302) is provided, a multistage pump (304) is provided on the right and below of the tank body (301), three filters (305) are installed on the upper wall of the tank body (301), and a circulating branch pipe (303) is connected between the filter (305), the multistage pump (304) and the waste liquid chamber (3011); the filter (305), the multistage pump (304) and the waste liquid chamber (3011) are interconnected via the circulating branch pipe (303), the output end of the filter (305) is connected to the reflux storage chamber (3012), and a reflux addition input pipe (306) is provided on the upper part of the reflux storage chamber (3012).

4. The chemical conversion stripping device for a printed circuit board chuck according to claim 1, characterized in that: The clamp circulation transmission mechanism (4) comprises a guide rail (401), a transmission steel belt (402), a copper target (403), a guide wheel (404), a clamp fixed end (405), a clamp rotating end (406) and a limit spring (407), wherein the guide rail (401) is installed on the upper part of the line support (1), a transmission steel belt (402) is arranged for circulation transmission behind the guide rail (401), copper targets (403) are fixed at equal intervals on the front wall of the transmission steel belt (402), and two guide wheels (404) are arranged on the upper part of each copper target (403). 4), and the upper guide wheel (404) and the lower guide wheel (404) are respectively in rotational contact with the inner side of the upper wall and the inner side of the lower wall of the guide rail (401), the left and right sides of the lower part of the copper target (403) are both provided with a chuck fixed end (405), and the chuck fixed end (405) is installed at the lower part of the conveyor steel belt (402), the middle part of the chuck fixed end (405) is rotatably mounted with a chuck rotating end (406) through a torsion spring and a bayonet, and a limit spring (407) is installed between the upper inner sides of the chuck fixed end (405) and the chuck rotating end (406).

5. The chemical conversion stripping device for a printed circuit board chuck according to claim 1, characterized in that: The nitrate hanging box (5) further comprises a sealed bottom plate (510), a concave confluence groove (511), a port sealing plate (513) and a cleaning agent inlet pipe (514). The bottom surfaces of the nitrate hanging front assembly group (501), the nitrate hanging partition assembly group (502), the nitrate hanging rear assembly group (503) and the nitrate hanging double water washing tank (504) are all installed with the sealed bottom plate (510). The left side of the sealed bottom plate (510) of the nitrate hanging front assembly group (501) is The right part of the sealed bottom plate (510) of the nitrate hanging rear assembly group (503) is respectively provided with a concave confluence groove (511), and the middle part of the sealed bottom plate (510) of the nitrate hanging double water washing tank (504) is provided with two concave confluence grooves (511), and the bottoms of the two concave confluence grooves (511) on the left are connected to the nitrate hanging water washing tank (3) on the left through the waste liquid output pipe (302), and the bottoms of the two concave confluence grooves (511) on the right are connected to the waste liquid output pipe (302). The outlet pipe (302) is connected to the right nitrate hanging water washing tank (3). The left end of the nitrate hanging front assembly group (501) and the right end of the nitrate hanging rear assembly group (503) are both fixed with port sealing plates (513). The two port sealing plates (513) form a closed connecting tank by connecting the nitrate hanging front assembly group (501), the nitrate hanging partition assembly group (502) and the nitrate hanging rear assembly group (503). The left and right ends of the nitrate hanging double water washing tank (504) are also fixed with port sealing plates (513). A port sealing plate (513) is provided to form a double nitrate hanging water washing tank (504) into a communicating tank with closed ends. A cleaning agent input pipe (514) is installed on the inner side of the front wall of the nitrate hanging front assembly group (501) and the nitrate hanging rear assembly group (503), and the cleaning agent input pipe (514) is connected to the left nitrate hanging water washing tank (3) through a reflux addition input pipe (306), and the left nitrate hanging water washing tank (3) is connected to the nitrate hanging cleaning agent adding mechanism (2).

6. The chemical conversion stripping device for a printed circuit board chuck according to claim 1, characterized in that: The nitrate hanging box (5) also includes a self-opening and closing guide block (512), and the self-opening and closing guide block (512) is fixedly connected between the support plates (506) on the inner sides of the front walls of the nitrate hanging front assembly group (501) and the nitrate hanging rear assembly group (503), and the self-opening and closing guide block (512) is intermittently pressed and contacted with the upper outer side of the chuck rotating end (406), and the rear wall of the self-opening and closing guide block (512) is inclined toward the rear at an angle gradually increasing from left to right.

7. The chemical conversion stripping device for a printed circuit board chuck according to claim 1, characterized in that: The saltpeter hanging box (5) further comprises an exhaust installation opening (515), a top plate installation strip (516), a sliding observation window (517), a water washing manifold (518), a partition (519), a water washing jet square tube (520), a cold air spray drying tube (521) and a steel belt limiting top plate (522). The front walls of the saltpeter hanging front assembly group (501), the saltpeter hanging partition assembly group (502) and the saltpeter hanging rear assembly group (503) are each provided with an exhaust installation opening (515). The front wall of the saltpeter hanging double water washing tank (504) is provided with two exhaust installation openings (515). An exhaust pipe is installed on the exhaust installation opening (515). Three top plate installation strips (516) are fixed to the inner side of the left rear wall of the saltpeter hanging double water washing tank (504). The three top plate installation strips (516) are fixed to the inner side of the left rear wall of the saltpeter hanging double water washing tank (504). ) is fixed with a steel belt limiting top plate (522) between the upper ends of the nitrate hanging double water washing tank (504), the left front wall of the nitrate hanging double water washing tank (504) is provided with two sliding observation windows (517), the middle of the nitrate hanging double water washing tank (504) is fixed with two water washing collectors (518), the bottom surface of the nitrate hanging double water washing tank (504) between the two water washing collectors (518) is fixed with a partition plate (519), the nitrate hanging double water washing tank (504) in front of and behind the two water washing collectors (518) are fixed with water washing square pipes (520), and the water washing square pipes (520) are connected with the reflux addition input pipe (306) of the right nitrate hanging water washing tank (3), and the inner sides of the right front wall and the inner sides of the rear wall of the nitrate hanging double water washing tank (504) are installed with cold air spray drying pipes (521).

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