CN113423187B

CN113423187B - PCB etching method and spraying etching machine

Info

Publication number: CN113423187B
Application number: CN202110671959.8A
Authority: CN
Inventors: 施喆文; 李钦
Original assignee: Xiamen Tengshengxing Electronic Technology Co ltd
Current assignee: Xiamen Tengshengxing Electronic Technology Co ltd
Priority date: 2021-06-17
Filing date: 2021-06-17
Publication date: 2022-11-08
Anticipated expiration: 2041-06-17
Also published as: CN113423187A

Abstract

The invention relates to the technical field of PCB etching, and particularly discloses a PCB etching method; the method comprises the following steps: 1) Selecting a masking belt with a designed etching line port according to a PCB etching design, installing the masking belt on a step etching device, and arranging a first group of etching line ports right below the masking belt by adjusting a stepping motor; 2) Righting a PCB to be etched, then placing the PCB on a U-shaped frame, conveying the PCB right and left to the position right below the step-by-step etching device through the rotation of the corrosion-resistant rubber roller, then starting a telescopic device to push a masking belt downwards so that the lower end of the masking belt is attached to the upper surface of the PCB, and then spraying through an etching liquid spray head; 3) After the etching liquid spraying in the first step is finished, the telescopic device is shortened, the covering belt moves upwards for a certain distance, and then the stepping motor is started to enable the guide roller to rotate.

Description

PCB etching method and spraying etching machine

Technical Field

The invention relates to the technical field of PCB etching, and particularly discloses a PCB etching method and a spray etching machine.

Background

A PCB is also called a printed circuit board or PCB and is a provider of electrical connections for electronic components. In the process of manufacturing the PCB, etching of the PCB is an essential step, and the etching of the PCB is performed by an etching machine. At present, when the existing spray etching machine sprays etching liquid, all spray heads are in cross coverage, and the etching liquid is not uniformly sprayed, so that the etching degree on a PCB is not uniform, and the etching effect of the PCB is seriously influenced.

For example, the invention with the application number of 2014104134113 discloses a PCB etching machine, which comprises a shell, wherein a pair of strip-shaped conveying brackets are arranged in the shell, and transmission wheel sets are respectively arranged on the two conveying brackets; a plurality of spraying devices are also arranged in the shell; the spraying device comprises: an upper spraying unit, an upper driving mechanism, a lower spraying unit, a lower driving mechanism, a liquid storage tank, a soft infusion tube and an infusion pump; the upper spraying unit and the lower spraying unit both comprise a horizontally arranged # -shaped support and two vertically arranged and mutually parallel baffles.

The invention also discloses a PCB etching machine as the invention patent with the application number of 2018108718121, which comprises an etching section and an etching post-treatment section which are sequentially and horizontally connected, wherein the etching section comprises a first etching tank, a second etching tank, a third etching tank and a first circulating water washing tank which are sequentially connected, the etching post-treatment section comprises a hot water washing tank, a film removing tank, a water washing tank, a pickling tank, a second circulating water washing tank and a drying section which are sequentially connected, the PCB etching machine also comprises a 55KW etching pump for conveying etching liquid to the etching section, the liquid outlet end of the 55KW etching pump is communicated with a spraying branch pipe arranged at the upper end of the etching section through an etching liquid main pipe, a plurality of communicating pipes are arranged on the spraying main pipe, and a plurality of spraying branch pipes which respectively penetrate through and extend into the first etching tank, the second etching tank and the third etching tank. The PCB etching machines disclosed by the two invention patents are in cross coverage when spraying and etching are carried out on the PCB, and uniform spraying in the whole area cannot be realized when etching solution is sprayed, so that the spraying effect on the PCB is seriously influenced. In addition, the two PCB etching machines disclosed above have low intelligent degree, and can not automatically adjust the spraying speed, pressure and spraying distance according to actual conditions. Therefore, aiming at the defects of the traditional PCB etching machine, the invention provides the PCB spraying etching machine and the etching method applicable to the PCB spraying etching machine, so that the defects of the traditional PCB etching machine in the process of etching a printed circuit board are overcome.

Disclosure of Invention

Technical problem to be solved

The invention aims to solve the defects of poor spraying effect and low automation degree of a PCB etching machine, and designs a PCB etching method and a spraying etching machine which can solve the technical problems.

(II) technical scheme

The invention is realized by the following technical scheme:

a PCB etching method comprises the following steps:

1) Selecting a masking belt with a designed etching line port according to a PCB etching design, mounting the masking belt on a step etching device, and arranging a first group of etching line ports right below the masking belt by adjusting a stepping motor;

2) The method comprises the following steps of (1) righting a PCB to be etched, then placing the PCB on a U-shaped frame, conveying the PCB right below a step-by-step etching device by left and right rotation of a corrosion-resistant rubber roller, then starting a telescopic device to push a masking belt downwards so that the lower end of the masking belt is attached to the upper surface of the PCB, and then spraying through an etching liquid spray head;

3) After the etching liquid spraying in the first step is finished, the telescopic device is shortened, the shielding belt moves upwards for a certain distance, then the stepping motor is started to enable the guide roller to rotate, so that the shielding belt is driven for a certain distance, the second group of etching line intersections are located right below, the lower end of the shielding belt is attached to the upper surface of the PCB, the second step of etching is carried out, and finally the step 3 is repeated until the shielding belt rotates for a circle and then the etching is finished;

4) Conveying the etched PCB to a cleaning area, spraying and cleaning the surface of the PCB through cleaning liquid sprayed by a cleaning liquid spraying head, and conveying the PCB after cleaning.

The invention also provides a PCB spraying etching machine for realizing the PCB etching method, which comprises a U-shaped frame, an etching solution storage tank, a cleaning solution storage tank and a control box, wherein the etching solution storage tank and the cleaning solution storage tank are respectively fixedly connected with the left end and the right end of the lower surface of the U-shaped frame;

the upper end of the U-shaped frame is provided with a processing housing, the middle of the processing housing is provided with a vertical clapboard, the left end and the right end of the processing housing are divided into an etching area and a cleaning area by the vertical clapboard, a step etching device is arranged in the etching area, the step etching device comprises an L-shaped plate and a telescopic device arranged on the upper surface of the processing housing, the lower end of the telescopic device extends into the etching area and is fixedly connected with the L-shaped plate, the front side surface of the L-shaped plate is provided with four guide rollers which are in an inverted trapezoidal shape and are rotatably connected on the front side surface of the L-shaped plate, four guide rollers are wound with shielding belts, the shielding belts are provided with a plurality of groups of etching line intersections, the rear side surface of the L-shaped plate is provided with a stepping motor, the output shaft of the stepping motor is connected with one of the guide rollers, and the rear side surface of the L-shaped plate positioned in the middle of the shielding belts is provided with a servo motor, the end part of the servo motor output shaft penetrating through the L-shaped plate is connected with a lead screw, the front end of the L-shaped plate is provided with a connecting plate, the front end of the lead screw is rotationally connected with a bearing seat on the connecting plate, a guide slide bar parallel to the lead screw is connected between the L-shaped plate and the connecting plate, the lead screw and the guide slide bar are provided with moving blocks, the moving blocks are provided with threaded holes and sliding holes matched with the lead screw and the guide slide bar, the side surface of the moving blocks is connected with a pipe body snap ring, the rear side surface of the etching liquid storage box is provided with a first liquid pump, the liquid inlet end of the first liquid pump is communicated with the etching liquid storage box, the liquid outlet end of the first liquid pump is connected with a first liquid conveying pipe, the end part of the first liquid conveying pipe extending into the etching area is connected with an S-shaped telescopic pipe, the end part of the S-shaped telescopic pipe penetrating through the L-shaped plate is connected with an etching liquid spraying head, the end part of the joint of the S-shaped telescopic pipe and the etching liquid spray head is matched with the pipe body clamping ring;

the back side of the cleaning liquid storage box is provided with a second liquid pump, the liquid inlet end of the second liquid pump is communicated with the cleaning liquid storage box, the liquid outlet end of the second liquid pump is connected with a second liquid conveying pipe, and the end part of the second liquid conveying pipe extending into the cleaning area is connected with a cleaning liquid spray head.

Furthermore, the lower end of the vertical partition plate is connected with a plurality of soft corrosion-resistant partition curtains at intervals.

Further, the telescoping device is one of a cylinder, a hydraulic cylinder or an electric telescopic rod.

Furthermore, the masking belt is provided with 2-4 groups of etching line intersections, and the intervals of the etching line intersections on the masking belt are equal.

Furthermore, an electric flow regulating valve is arranged on the first infusion tube.

Furthermore, the end of the second infusion tube is connected with a three-way joint, two ends of the three-way joint are respectively connected with a longitudinal cleaning liquid tube extending into the cleaning area, the two longitudinal cleaning liquid tubes are respectively arranged at the left end and the right end of the cleaning area, a plurality of cleaning liquid spray heads are connected to the longitudinal cleaning liquid tube at intervals, and the cleaning liquid spray heads are arranged obliquely downwards.

Furthermore, a first infrared generator and a first infrared receiver are respectively arranged on the front inner wall and the rear inner wall of the U-shaped frame below the etching area, and the first infrared generator and the first infrared receiver are arranged in an aligned mode and are arranged at the height position parallel to the upper end of the corrosion-resistant rubber roller.

Furthermore, a second infrared generator and a second infrared receiver are respectively arranged on the front inner wall and the rear inner wall of the U-shaped frame below the cleaning area, and the second infrared generator and the second infrared receiver are arranged in an aligned mode and are arranged at the height position parallel to the upper end of the corrosion-resistant rubber roller.

Furthermore, the lower surfaces of the etching solution storage tank and the cleaning solution storage tank are provided with a plurality of support legs.

(III) advantageous effects

Compared with the prior art, the invention has the beneficial effects that:

1) According to the PCB etching method and the spray etching machine provided by the invention, when the PCB spray etching machine disclosed by the invention sprays etching liquid, the etching liquid can only contact with the PCB through the etching line crossing under the blocking action of the masking belt, so that etching is carried out according to the designed line, meanwhile, the masking belt is driven to rotate by the stepping motor, different etching line crossings are converted for carrying out step-by-step etching liquid spraying treatment, and the influence of the cross repetition of the traditional etching machine on the PCB during etching is effectively avoided through multiple times of local spray etching, so that the etching effect is improved.

2) According to the PCB etching method and the spraying etching machine provided by the invention, the servo motor is arranged to drive the lead screw to rotate, and then the moving block can be driven to reciprocate in the etching area through the cooperation between the moving block and the lead screw, so that the etching liquid is sprayed more uniformly, and the spraying flow and pressure can be adjusted through the control box and the circulation adjusting valve, so that the PCB spraying etching effect is better.

3) According to the PCB etching method and the spraying etching machine provided by the invention, the position where the PCB enters can be judged through the arranged infrared generator and the arranged infrared receiver, so that the position is fed back to the control box in time, and then the control box sends out related commands, so that the whole PCB spraying etching machine can carry out automatic processing, and the PCB spraying etching machine has higher intelligent degree and multiple functions.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a first angular perspective view of the present invention;

FIG. 2 is a second perspective view of the present invention;

FIG. 3 is a three-dimensional structure diagram of the U-shaped frame, the first rotating rod, the corrosion-resistant rubber roller and other parts of the invention;

FIG. 4 is a top plan view of the U-shaped frame of the present invention;

FIG. 5 is a schematic perspective view of a processing enclosure according to the present invention;

FIG. 6 is a schematic front view of the interior plan structure of the process enclosure of the present invention;

FIG. 7 is a schematic view of a first angled perspective of a step etching apparatus according to the present invention;

FIG. 8 is a schematic view of a second angular perspective of the step etching apparatus of the present invention;

FIG. 9 is an enlarged view of the structure of FIG. 8 at A in accordance with the present invention;

FIG. 10 is a schematic perspective view of an S-shaped extension tube and an etching solution shower head according to the present invention;

FIG. 11 is a flowchart of the steps of etching by the PCB spray etcher of the present invention.

Wherein the content of the first and second substances,

1-U-shaped frame, 100-control box, 101-first rotating rod, 102-corrosion-resistant rubber roller, 103-transmission box, 104-first bevel gear, 105-driving motor, 106-second rotating rod, 107-second bevel gear, 108-first infrared generator, 109-first infrared receiver, 110-second infrared generator and 111-second infrared receiver;

2-etching solution storage tank, 3-cleaning solution storage tank, 301-second liquid pump, 302-second liquid conveying pipe, 303-cleaning solution spray header, 304-longitudinal cleaning solution pipe;

4-processing a housing, 400-a vertical partition plate, 401-an etching area, 402-a cleaning area, 403-a soft corrosion-resistant partition curtain;

5-step etching device, 501-L-shaped plate, 502-expansion device, 503-guide roller, 504-masking belt, 5041-etching intersection, 505-stepping motor, 506-servo motor, 507-connecting screw rod, 508-connecting plate, 509-guiding slide bar, 510-moving block, 511-pipe body snap ring, 512-first liquid pump, 513-first liquid conveying pipe, 514-S-shaped expansion pipe, 515-etching liquid spray head, 516-electric flow regulating valve,

6-support leg.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Moreover, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The PCB etching method and the spray etcher disclosed in the present application will be described in detail with reference to fig. 1 to 10, in conjunction with embodiments.

The invention provides a PCB etching method, which comprises the following steps:

3) After the first step of etching liquid spraying is finished, shortening the telescopic device, moving the masking belt upwards for a certain distance, starting the stepping motor to enable the guide roller to rotate, so that the masking belt is driven for a certain distance, the second group of etching line openings are positioned right below, attaching the lower end of the masking belt to the upper surface of the PCB, performing second step etching, and finally repeating the step 3 until the masking belt rotates for a circle, and then finishing the etching;

Example 1

The invention also provides a PCB spraying etching machine for realizing the PCB etching method, and the embodiment 1 discloses the PCB spraying etching machine, and the main component of the PCB spraying etching machine comprises a U-shaped frame 1, an etching solution storage tank 2, a cleaning solution storage tank 3 and a control box 100 by referring to the attached

drawings

1, 3 and 4. With etching solution bin 2 and washing liquid bin 3 respectively with both ends fixed connection about U type rack 1 lower surface to all be provided with a plurality of stabilizer blades 6 at the lower surface of etching solution bin 2 and washing liquid bin 3. A plurality of first rotating rods 101 are arranged in the U-shaped frame 1 in a rotating mode at equal intervals, and a plurality of corrosion-resistant rubber rollers 102 are arranged on each first rotating rod 101 at equal intervals. Meanwhile, a transmission box 103 is arranged on the front side surface of the U-shaped rack 1, the front end of each first rotating rod 101 extends into the transmission box 103, and a first bevel gear 104 is arranged at the end part of each first rotating rod 101 extending into the transmission box 103. A driving motor 105 is arranged at the end part of the transmission case 103, a second rotating rod 106 perpendicular to the first rotating rod 101 is connected to the end part of the output shaft of the driving motor 105 extending into the transmission case 103, a plurality of second bevel gears 107 are connected to the second rotating rod 106, each second bevel gear 107 is meshed with the first bevel gear 104 corresponding to the end part of the first rotating rod 101, and the synchronous rotation of all the first rotating rods 101 in the U-shaped rack 1 can be realized through the driving action of one driving motor 105.

Referring to fig. 5 and 6, a processing housing 4 is arranged at the upper end of the U-shaped frame 1, a vertical partition plate 400 is arranged in the middle of the processing housing 4, the vertical partition plate 400 divides the left and right ends of the processing housing 4 into an etching area 401 and a cleaning area 402, and a step etching device 5 is arranged in the etching area 401.

Referring to fig. 7, 8 and 9, the step-by-step etching apparatus 5 of the present embodiment includes an L-shaped plate 501 and a telescopic device 502 disposed on the upper surface of the processing housing 4, wherein the telescopic device 502 is one of a cylinder, a hydraulic cylinder or an electric telescopic rod. The lower end of the telescopic device 502 extends into the etching area 401 to be fixedly connected with the L-shaped plate 501, four guide rollers 503 are arranged on the front side face of the L-shaped plate 501, the four guide rollers 503 are rotatably connected to the front side face of the L-shaped plate 501 in an inverted trapezoidal shape, the four guide rollers 503 are wound with the masking belt 504, the masking belt 504 is provided with a plurality of groups of etching line intersections 5041, when the masking belt 504 is specifically arranged, the etching line intersections 5041 of the masking belt 504 are arranged in 2-4 groups, the intervals of the etching line intersections 5041 of each group on the masking belt 504 are equal, and each group of the etching line intersections 5041 is designed according to the etching mode. A stepping motor 505 is arranged on the rear side face of the L-shaped plate 501, an output shaft of the stepping motor 505 is connected with one of the guide rollers 503, and the masking belt 504 can be driven at a fixed distance through the driving effect of the stepping motor 505.

The rear side surface of the L-shaped plate 501 positioned in the middle of the masking belt 504 is provided with a servo motor 506, the output shaft of the servo motor 506 penetrates through the end part of the L-shaped plate 501 to be connected with a lead screw 507, the front end of the L-shaped plate 501 is provided with a connecting plate 508, and the front end of the lead screw 507 is rotationally connected with a bearing seat on the connecting plate 508. Meanwhile, a guide sliding rod 509 parallel to the lead screw 507 is connected between the L-shaped plate 501 and the connecting plate 508, the lead screw 507 and the guide sliding rod 509 are provided with a moving block 510, and the side surface of the moving block 510, which is provided with a threaded hole matched with the lead screw 507 and the guide sliding rod 509 and a sliding hole, is connected with a pipe body clamping ring 511.

Referring to fig. 2 and 10, a first liquid pump 512 is disposed on the rear side of the etching solution storage tank 2, a liquid inlet end of the first liquid pump 512 is communicated with the etching solution storage tank 2, a liquid outlet end of the first liquid pump 512 is connected with a first liquid conveying pipe 513, an end of the first liquid conveying pipe 513 extending into the etching area 401 is connected with an S-shaped telescopic pipe 514, an end of the S-shaped telescopic pipe 514 penetrating through the L-shaped plate 501 is connected with an etching solution spray header 515, and an end of a connection part of the S-shaped telescopic pipe 514 and the etching solution spray header 515 is matched with the pipe body snap ring 511. A second liquid pump 301 is arranged on the rear side face of the cleaning liquid storage tank 3, a liquid inlet end of the second liquid pump 301 is communicated with the cleaning liquid storage tank 3, a liquid outlet end of the second liquid pump 301 is connected with a second liquid conveying pipe 302, and the end part of the second liquid conveying pipe 302 extending into the cleaning area 402 is connected with a cleaning liquid spray head 303.

Example 2

Embodiment 2 discloses a PCB spray etching machine improved based on embodiment 1, which is the same as embodiment 1 and will not be described again, and the difference is shown in fig. 2, fig. 4 and fig. 5, in this embodiment 2, a plurality of soft corrosion-resistant partition curtains 403 are further connected to the lower end of the vertical partition 400 at intervals, so as to effectively prevent the cross contact of liquid between the etching area 401 and the cleaning area 402.

Meanwhile, an electric flow control valve 516 is further provided on the first liquid transport pipe 513, and the flow of the etching solution can be automatically controlled by the electric flow control valve 516. In addition, in this embodiment 2, a three-way joint is connected to an end of the second infusion tube 302, two ends of the three-way joint are respectively connected to a longitudinal cleaning liquid tube 304 extending into the cleaning area 402, the two longitudinal cleaning liquid tubes 304 are respectively located at the left and right ends of the cleaning area 402, a plurality of cleaning liquid showers 303 are connected to each longitudinal cleaning liquid tube 304 at intervals, the cleaning liquid showers 303 are arranged obliquely downward, and the etching liquid on the PCB can be cleaned by the cleaning action of the cleaning liquid showers 303 at the left and right sides.

Finally, in this embodiment 2, a first infrared generator 108 and a first infrared receiver 109 are respectively disposed on the front and rear inner walls of the U-shaped frame 1 located below the etching area 401, and the first infrared generator 108 and the first infrared receiver 109 are aligned and disposed at a height position parallel to the upper end of the corrosion-resistant rubber roller 102. Meanwhile, a second infrared ray generator 110 and a second infrared ray receiver 111 are respectively arranged on the front inner wall and the rear inner wall of the U-shaped frame 1 below the cleaning area 402, and the second infrared ray generator 110 and the second infrared ray receiver 111 are arranged in an aligned manner and are both arranged at a height position parallel to the upper end of the corrosion-resistant rubber roller 102.

When the PCB board enters the etching area 401, the PCB board blocks the first infrared receiver 109 from receiving the infrared ray, so that the information is fed back to the control box 100, and the control box automatically controls the start of the etching solution spraying. Similarly, when the PCB enters the cleaning area 402, the PCB blocks the second infrared receiver 111 from receiving infrared rays, so that the information is fed back to the control box 100, and the control box automatically controls the cleaning liquid to start spraying, thereby realizing the automation of the whole process.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The PCB spraying etching machine is characterized by comprising a U-shaped frame (1), an etching solution storage tank (2), a cleaning solution storage tank (3) and a control box (100), wherein the etching solution storage tank (2) and the cleaning solution storage tank (3) are fixedly connected with the left end and the right end of the lower surface of the U-shaped frame (1) respectively, a plurality of first rotating rods (101) are arranged in the U-shaped frame (1) in a rotating mode at equal intervals, a plurality of corrosion-resistant rubber rollers (102) are arranged on each first rotating rod (101) at equal intervals, a transmission box (103) is arranged on the front side face of the U-shaped frame (1), the front end of each first rotating rod (101) extends into the transmission box (103) to be arranged inside, a first bevel gear (104) is arranged at the end part, extending into the transmission box (103), of each first rotating rod (101), a driving motor (105) is arranged at the end part of each transmission box (103), a second bevel gear (106) perpendicular to the first rotating rod (101) is connected to the end part of an output shaft of the driving motor (105), and a second bevel gear (107) is connected with a second bevel gear (107) which is arranged on the corresponding to the first bevel gear (107);

the upper end of the U-shaped frame (1) is provided with a processing cover shell (4), the middle of the processing cover shell (4) is provided with a vertical partition plate (400), the left end and the right end of the processing cover shell (4) are divided into an etching area (401) and a cleaning area (402) by the vertical partition plate (400), a step etching device (5) is arranged in the etching area (401), the step etching device (5) comprises an L-shaped plate (501) and a telescopic device (502) arranged on the upper surface of the processing cover shell (4), the lower end of the telescopic device (502) extends into the etching area (401) to be fixedly connected with the L-shaped plate (501), the front side surface of the L-shaped plate (501) is provided with four guide rollers (503), the four guide rollers (503) are rotatably connected on the front side surface of the L-shaped plate (501) in an inverted trapezoid shape, a belt (504) is wound on the four guide rollers (503), a plurality of etching line crossing ports (5041) are arranged on the belt (504), the rear side surface of the L-shaped plate (501) is provided with a stepping motor (505), one of the stepping motor (505), and an output shaft (501) of the servo motor (507) passes through one of the servo motor (501), and the servo motor (501) is connected with an output shaft (507), the etching device is characterized in that a connecting plate (508) is arranged at the front end of the L-shaped plate (501), the front end of a lead screw (507) is rotationally connected with a bearing seat on the connecting plate (508), a guide slide bar (509) parallel to the lead screw (507) is connected between the L-shaped plate (501) and the connecting plate (508), a moving block (510) is arranged on the lead screw (507) and the guide slide bar (509), a threaded hole and a sliding hole which are matched with the lead screw (507) and the guide slide bar (509) are formed in the moving block (510), a pipe body clamping ring (511) is connected to the side surface of the moving block (510), a first liquid pump (512) is arranged on the rear side surface of the etching liquid storage box (2), the liquid inlet end of the first liquid pump (512) is communicated with the etching liquid storage box (2), the liquid outlet end of the first liquid pump (512) is connected with a first liquid pipe (513), the end of the first liquid pipe (513) extending into the etching area (401) is connected with an S-shaped telescopic pipe (514), the end of the S-shaped telescopic pipe (514) penetrates through the L-shaped plate (501) and is matched with the end of a spray head (511) of the spray pipe (515);

the back flank of washing liquid bin (3) is provided with second liquid pump (301), the inlet end and washing liquid bin (3) of second liquid pump (301) are linked together, the play liquid end of second liquid pump (301) is connected with second transfer line (302), end connection washing liquid shower head (303) that second transfer line (302) stretched into cleaning zone (402).

2. The PCB spray etching machine according to claim 1, wherein a plurality of soft corrosion-resistant partition curtains (403) are connected to the lower end of the vertical partition (400) at intervals.

3. The PCB spray etching machine of claim 1, wherein the telescopic device (502) is one of a cylinder, a hydraulic cylinder or an electric telescopic rod.

4. The PCB spray etching machine of claim 1, wherein the masking belt (504) is provided with 2-4 groups of etching intersections (5041), and the etching intersections (5041) of each group are equally spaced on the masking belt (504).

5. The PCB spray etching machine according to claim 1, wherein an electric flow control valve (516) is arranged on the first liquid conveying pipe (513).

6. The PCB spraying etching machine as claimed in claim 1, wherein a three-way joint is connected to the end of the second liquid conveying pipe (302), two ends of the three-way joint are respectively connected with a longitudinal cleaning liquid pipe (304) extending into the cleaning area (402), the two longitudinal cleaning liquid pipes (304) are respectively arranged at the left end and the right end of the cleaning area (402), a plurality of cleaning liquid spraying heads (303) are connected to each longitudinal cleaning liquid pipe (304) at intervals, and the cleaning liquid spraying heads (303) are arranged obliquely downwards.

7. The PCB spraying etching machine of claim 1, wherein a first infrared ray generator (108) and a first infrared ray receiver (109) are respectively arranged on the front and back inner walls of the U-shaped frame (1) below the etching area (401), and the first infrared ray generator (108) and the first infrared ray receiver (109) are aligned and are both arranged at a height position parallel to the upper end of the corrosion-resistant rubber roller (102).

8. The PCB spraying and etching machine of claim 7, wherein a second infrared ray generator (110) and a second infrared ray receiver (111) are respectively arranged on the front and rear inner walls of the U-shaped frame (1) below the cleaning area (402), and the second infrared ray generator (110) and the second infrared ray receiver (111) are aligned and are both arranged at a height position parallel to the upper end of the corrosion-resistant rubber roller (102).

9. The PCB spray etching machine according to claim 1, wherein a plurality of support legs (6) are arranged on the lower surfaces of the etching solution storage tank (2) and the cleaning solution storage tank (3).