PCB multilayer board etching machine

Abstract

The invention discloses a PCB multi-layer board etching machine, and relates to the field of PCB etching, the PCB multi-layer board etching machine comprises a conveying mechanism, an etching mechanism and a cleaning mechanism, the cleaning mechanism comprises a frame body, negative pressure suction pieces and bull eye universal rollers which are alternately distributed are arranged below the frame body, the negative pressure suction pieces are used for sucking etching liquid on the surface of a PCB, and the negative pressure suction pieces are used for sucking the etching liquid on the surface of the PCB. When rolling balls of the bull-eye universal rolling wheels make contact with the surface of the PCB, gaps are formed between the bottoms of the negative pressure suction pieces and the surface of the PCB, the cleaning mechanism can reciprocate in the direction perpendicular to the moving direction of the PCB, and the reciprocating distance of the cleaning mechanism is larger than the distance between every two adjacent negative pressure suction pieces; according to the PCB multi-layer board etching machine, by optimizing the moving path of the cleaning mechanism and the layout of the suction part, the problem that a suction blind area exists in a through hole area of a traditional etching machine is effectively solved, the cleaning efficiency of etching liquid is improved, and the cleanliness of the surface of a PCB and the interior of a through hole is ensured.

Description

Technical Field

[0001] The present invention relates to PCB board etching technology, and specifically to an etching machine for PCB multi-layer boards. Background Art

[0002] When processing a PCB circuit board, during etching, the etching solution is sprayed on the surface of the circuit board. After etching is completed, the etching solution needs to be removed in a timely manner. For example, in a Chinese invention patent with the publication number CN114980525A, a negative pressure liquid removal component and a PCB board etching device applied to this component are disclosed. Through the cooperation of a negative pressure suction end and a rolling wheel, the waste liquid existing on the surface of the board can be quickly sucked and processed, and during the processing, the situation where one end of the board warps due to too strong suction no longer occurs;

[0003] However, since there are often many through holes on the board body of the circuit board, during the etching process, the through holes whose movement paths are located below the rolling wheel will be blocked. When passing through the negative pressure suction end, the etching solution in the through holes located below the rolling wheel cannot be sucked, resulting in a certain blind area and causing etching solution residue inside / around the through holes. Summary of the Invention

[0004] The purpose of the present invention is to provide an etching machine for PCB multi-layer boards to solve the above deficiencies in the prior art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An etching machine for PCB multi-layer boards includes a conveying mechanism and an etching mechanism, and further includes a cleaning mechanism. The cleaning mechanism includes a frame body. Below the frame body, negative pressure suction members and bull's-eye universal rollers are alternately distributed. The negative pressure suction members are used to suck the etching solution on the surface of the PCB board. When the rolling balls of the bull's-eye universal rollers contact the surface of the PCB board, there is a gap between the bottom of the negative pressure suction member and the surface of the PCB board. The cleaning mechanism can reciprocate in a direction perpendicular to the moving direction of the PCB board, and the distance of its reciprocating movement is greater than the distance between adjacent two negative pressure suction members.

[0006] Further, the negative pressure suction members are slidably installed below the frame body through four guide columns.

[0007] Further, a first adjusting member is provided on one side of the negative pressure suction member, which is used to drive the negative pressure suction member to move in the vertical direction to adjust the size of the gap.

[0008] Further, the first adjusting member includes a first threaded rod. One end of the first threaded rod is rotatably connected to the top of the negative pressure suction member, and the surface of the first threaded rod is threadedly connected to the inner wall of the frame body.

[0009] Further, the wheel seat of the bull's-eye universal roller is spherical. A conical groove is formed on one side of the negative pressure suction member close to the bull's-eye universal roller. A first spring is sleeved on the guide post. The elastic force of the first spring acts on the negative pressure suction member to make it tend to move away from the frame. A bushing is sleeved on the guide post. A first sliding groove is formed on the frame along its length direction. The bushing is slidably connected with the first sliding groove. A second adjusting member is arranged on the frame and is used to drive the bull's-eye universal rollers to approach or move away from each other at equal intervals.

[0010] Further, the second adjusting member includes a sliding seat installed on the top of each bull's-eye universal roller. A second sliding groove for the sliding seats to slide is formed on the frame. The second adjusting member further includes a second threaded rod which is threadedly connected with the inner walls of the sliding seats.

[0011] Further, the negative pressure suction member includes a bin body. A plurality of liquid suction holes are formed at the bottom of the bin body. An anti-blocking hole assembly is arranged in the bin body. The anti-blocking hole assembly includes an anti-blocking plate which is slidably connected with the inner wall of the bin body. A thimble corresponding to each liquid suction hole is arranged at the bottom of the anti-blocking plate. A pressure rod is fixedly connected to the top of the anti-blocking plate.

[0012] Further, a second spring is arranged on the pressure rod. The elastic force of the second spring acts on the anti-blocking plate to make it tend to move away from the liquid suction holes. The top of the pressure rod is located between the negative pressure suction member and the frame.

[0013] Further, the frame is slidably installed on the base. A driving member for driving the frame to move reciprocally is arranged on the base.

[0014] Compared with the prior art, a PCB multi-layer board etching machine provided by the present invention has the following beneficial effects:

[0015] By optimizing the moving path of the cleaning mechanism and the layout of the suction members, the PCB multi-layer board etching machine effectively solves the problem of suction blind areas in the through-hole area of the traditional etching machine, improves the removal efficiency of the etching solution, ensures the cleanliness of the surface and the inside of the through-holes of the PCB board, reduces the short-circuit risk caused by chemical residues, and significantly improves the product quality and process stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings.

[0017] Figure 1 It is a front view of a partial structure of the etching machine provided by an embodiment of the present invention;

[0018] Figure 2 Schematic diagram of partial structures of the conveying mechanism and the cleaning mechanism provided by an embodiment of the present invention;

[0019] Figure 3 Schematic diagram of partial structures of the cleaning mechanism and the PCB board provided by an embodiment of the present invention;

[0020] Figure 4 Schematic diagram of the structure when the bull's-eye universal roller and the negative pressure suction member on the PCB board provided by an embodiment of the present invention are working;

[0021] Figure 5 Schematic diagram of the structure when a first adjusting member is provided on the negative pressure suction member provided by an embodiment of the present invention;

[0022] Figure 6 Schematic diagram of a partial cross-section of the cleaning mechanism provided by an embodiment of the present invention;

[0023] Figure 7 Schematic diagram of the structure of the negative pressure suction member provided by an embodiment of the present invention;

[0024] Figure 8 Schematic diagram of the state when the cleaning mechanism (adjacent two negative pressure suction members) reciprocates provided by an embodiment of the present invention.

[0025] Explanation of reference numerals:

[0026] 1, PCB board; 2, conveying mechanism; 3, etching mechanism; 4, cleaning mechanism; 41, frame; 42, negative pressure suction member; 421, conical groove; 422, first spring; 423, bushing; 424, first chute; 425, bin; 426, liquid suction hole; 43, bull's-eye universal roller; 431, wheel seat; 432, rolling ball; 44, guide post; 45, first adjusting member; 46, second adjusting member; 461, sliding seat; 462, second chute; 463, second threaded rod; 47, anti-blocking hole assembly; 471, anti-blocking plate; 472, ejector pin; 473, pressure rod; 474, second spring; 5, gap; 6, base. Detailed implementation manners

[0027] During the processing of PCB multi-layer circuit boards, in the etching process, the etching solution is evenly covered on the surface of the circuit board by the spraying process. After the pattern transfer is completed, the residual etching solution needs to be removed in time. Currently, the industry generally uses a negative pressure liquid removal component as a solution. This device cooperates with a precisely designed negative pressure suction end and an active rolling wheel to efficiently remove the surface waste liquid while ensuring the stable transmission of the board. Compared with the traditional vacuum suction system, this technology effectively avoids the problem of warping and deformation of the board caused by excessive local suction force;

[0028] However, this solution has significant technical bottlenecks: when there are multiple via structures on one side of the PCB board, since the rolling wheel will cover part of the hole area during the transmission process, the etching solution retained in the shielded vias cannot be effectively pumped out by the negative pressure system. Specifically, during the continuous production process, when the via moves with the board and passes under the rolling wheel, a physical shielding effect is formed. When this area moves to the negative pressure suction station, a suction blind area has been formed, ultimately resulting in the residual etching solution inside the via and in the adjacent area. This defect not only affects the quality of subsequent processes, but may also lead to potential short - circuit risks caused by poor plating on the hole wall or chemical residues. This application proposes an etching machine with comprehensive etching and cleaning capabilities. To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] Example, please refer to Figure 1 - Figure 8 , this multi - layer PCB etching machine includes a conveying device and a cleaning mechanism 4, Figure 1 and Figure 2 Partial structural diagrams of the conveying device and the cleaning mechanism 4 are given in

[0030] As Figure 3 and Figure 4 shown, the cleaning mechanism 4 includes a frame 41. Below the frame 41, there are alternately distributed negative pressure suction members 42 and bull - eye universal rollers 43. The negative pressure suction members 42 are used to suck the etching solution on the surface of the PCB board 1. When the rolling balls 432 of the bull - eye universal rollers 43 contact the surface of the PCB board 1, there is a gap 5 between the bottom of the negative pressure suction member 42 and the surface of the PCB board 1. The cleaning mechanism 4 can reciprocate in a direction perpendicular to the moving direction of the PCB board 1, and the distance of its reciprocating movement is greater than the distance between adjacent two negative pressure suction members 42;

[0031] When the PCB board 1 is etched by the etching machine, first, the etching solution is sprayed at the etching mechanism 3, and then it is conveyed to the cleaning mechanism 4 by the conveying mechanism 2 for cleaning. During cleaning, the PCB board 1 maintains a low - speed conveying state. The frame 41 reciprocates in a direction perpendicular to the moving direction of the PCB board 1, and the moving distance is greater than the distance between adjacent two negative pressure suction members 42. That is to say, when the frame 41 moves, the swept range of adjacent two negative pressure suction members 42 can cover the shielding area occupied by the bull - eye universal rollers 43, so as to suck the residual liquid on the entire surface of the PCB board 1. The residual liquid in the vias on the PCB board 1 can also be sucked simultaneously, thus avoiding the existence of a blind area during suction, resulting in the residual etching solution and affecting the cleaning effect and the subsequent processing of the PCB board 1;

[0032] It should be noted that the setting of the bull's-eye universal roller 43 enables the negative pressure suction member 42 to maintain a certain gap 5 from the surface of the PCB board 1 and to roll freely on the surface of the PCB board 1. The material of the bull's-eye sphere is preferably plastic to avoid scratching or damaging the surface of the PCB board 1. Compared with the prior art methods, the present invention effectively solves the problem of suction blind spots in the via area of traditional etching machines by optimizing the movement path of the cleaning mechanism 4 and the layout of the suction members, improves the removal efficiency of the etching solution, ensures the cleanliness of the surface of the PCB board 1 and the inside of the vias, reduces the short-circuit risk caused by chemical residues, and significantly improves the product quality and process stability;

[0033] As Figure 8 shown, the figure exemplarily shows a state where one of the bull's-eye universal rollers 43 is covered by the negative pressure suction member 42 during movement. The black curve in the figure is the trajectory of the bull's-eye universal roller 43 during its own movement and the movement of the PCB board 1, and the shaded part represents the area covered by the negative pressure suction member 42;

[0034] As Figure 8 shown, the moving speed of the cleaning mechanism 4 (the speed during one-way movement) should be adapted to the moving speed of the PCB board 1. Specifically, let the conveying speed of the PCB board 1 be V1, the moving speed of the cleaning mechanism 4 be V2, the distance between adjacent two negative pressure suction members 42 be X, and the covering length of the liquid suction holes 426 of the negative pressure suction member 42 along the PCB conveying direction be Y. Then, within the unit time t, V1*t≤Y and V2*t≥X, so as to ensure that the coverage ranges of each suction member can be seamlessly connected, avoid omission, achieve comprehensive cleaning, and improve the overall process precision.

[0035] In an embodiment of the present invention, the number of the negative pressure suction members 42 can be flexibly adjusted according to the size of the PCB board 1 and the cleaning requirements to ensure that each area is effectively covered. By precisely controlling V1 and V2, efficient synchronous cleaning is achieved, the production process is further optimized, the maintenance cost is reduced, and the overall utilization rate of the equipment is improved.

[0036] In an embodiment of the present invention, as Figure 6 and Figure 7 shown, the negative pressure suction member 42 is slidably mounted below the frame body 41 through four guide posts 44. Further, a first adjusting member 45 is provided on one side of the negative pressure suction member 42, which is used to drive the negative pressure suction member 42 to move in the vertical direction to adjust the size of the gap 5;

[0037] In one embodiment of the present invention, a specific example of a first adjusting member 45 is provided (not shown in the figure): the first adjusting member 45 includes a first threaded rod, one end of which is rotatably connected to the top of the negative pressure suction member 42, and the surface of the first threaded rod is threadedly connected to the inner wall of the frame 41. By rotating the first threaded rod, the gap 5 between the negative pressure suction member 42 and the PCB board 1 can be adjusted to ensure adaptability to PCB boards 1 of different thicknesses and improve the cleaning effect. In addition, this method supports independent adjustment of each negative pressure suction member 42, flexibly responds to different process requirements, and enhances the versatility of the equipment. For example, if the circuits on the PCB board 1 are concentrated in the middle area, the gap 5 of the middle negative pressure suction member 42 can be adjusted in a targeted manner to enhance the cleaning strength of this area. However, its disadvantage is that manual adjustment is required, which increases the complexity of operation. It should be noted that for the independent adjustment of the above-mentioned negative pressure suction member 42, the wheel seat 431 of the bull's eye universal roller 43 should not interfere with the movement of the negative pressure suction member 42, which can be a square wheel seat 431, and the surface of the wheel seat 431 can slide and cooperate with the negative pressure suction member 42 in the vertical direction.

[0038] In one embodiment of the present invention, another specific example of the first adjusting member 45 is provided (see Figure 6 ): The wheel seat 431 of the bull's eye universal roller 43 is spherical, and a conical groove 421 is provided on the side of the negative pressure suction piece 42 close to the bull's eye universal roller 43. A first spring 422 is sleeved on the guide column 44, and the elastic force of the first spring 422 acts on the negative pressure suction piece 42 to make it have a tendency to move away from the frame 41. A shaft sleeve 423 is sleeved on the guide column 44, and a first slide groove 424 is provided on the frame 41 along its length direction. The shaft sleeve 423 is slidably connected with the first slide groove 424, and a second adjusting piece 46 is provided on the frame 41, which is used to drive each bull's eye universal roller 43 to be equidistantly close to or away from each other. At this time, the wheel seat 431 is spherical. When the bull's eye universal roller 43 moves The wheel seats 431 are also driven to move closer to or farther from each other. Each wheel seat 431 will push the negative pressure suction member 42 through the conical groove 421 of the negative pressure suction member 42 to move it. For example, when two adjacent wheel seats 431 are close to each other, the negative pressure suction member 42 is moved downward by the conical groove 421 and compresses the first spring 422, and vice versa, it is relaxed to adjust the gap 5, thereby simplifying the operation process. When each bull's eye universal roller 43 is adjusted synchronously, the negative pressure suction member 42 moves synchronously as a whole, and the moving distance is basically the same, ensuring that the board gap 5 of each area and the PCB board 1 is consistent. This design not only improves the adjustment efficiency, but also reduces the error caused by manual adjustment, and further optimizes the stability and reliability of the equipment.

[0039] Specifically, the second adjusting member 46 includes a sliding seat 461 mounted on the top of each bull's-eye universal roller 43. A second sliding groove 462 for the sliding of each sliding seat 461 is formed on the frame body 41. The second adjusting member 46 further includes a second threaded rod 463, and the second threaded rod 463 is threadedly connected to the inner wall of each sliding seat 461;

[0040] By rotating the second threaded rod 463, each sliding seat 461 moves synchronously within the second sliding groove 462 where it is located. As Figure 4 and Figure 6 shown, the second threaded rod 463 is arranged such that the sliding seat 461 at the middle is rotationally connected to the second threaded rod 463, and the remaining sliding seats 461 are threadedly connected to the threaded segments on the second threaded rod 463, and the threaded directions of the threaded segments at symmetric positions in the middle are opposite, so that each sliding seat 461 moves equidistantly closer to or away from the middle when the second threaded rod 463 rotates. In addition, the sliding seat 461 at the end can also be configured to be rotationally connected to the second threaded rod 463, so that the remaining sliding seats 461 move equidistantly closer to or away from the sliding seat 461 at the end. There is no essential difference between the two methods, and both can achieve synchronous adjustment. In this embodiment, the method of rotational connection of the middle sliding seat 461 is preferably adopted;

[0041] It should be noted that since the negative pressure liquid suction member at the end position is not pushed by other bull's-eye universal rollers 43, its moving distance needs to be adjusted separately. As Figure 3 shown, the negative pressure liquid suction member at the end position is slidably connected to the inner wall of the frame body 41 through a transverse guide rod (not shown in the figure). A third spring (not shown in the figure) is sleeved on the transverse guide rod, and a third sliding groove (not shown in the figure) for the sliding of the guide rod is formed on the frame body 41 in the vertical direction. The transverse guide rod is slidably connected to the third sliding groove, and the elastic force of the third spring acts on the negative pressure liquid suction member.

[0042] Since the liquid suction holes 426 of the negative pressure suction member 42 are easily blocked by some foreign objects when sucking the etching solution, resulting in a decrease in the liquid suction efficiency, when the cleaning mechanism 4 moves reciprocally, once a blockage occurs, it will affect the suction effect of the negative pressure suction member 42. In an embodiment of the present invention, a method for solving this problem is further proposed. Specifically, a plurality of liquid suction holes 426 are formed at the bottom of the housing 425 of the negative pressure suction member 42, and an anti-blocking hole assembly 47 is arranged in the housing 425. The anti-blocking hole assembly 47 includes an anti-blocking plate 471 which is slidably connected to the inner wall of the housing 425. A thimble 472 corresponding to each liquid suction hole 426 is arranged at the bottom of the anti-blocking plate 471, and a pressure rod 473 is fixedly connected to the top of the anti-blocking plate 471. Similar to the separately provided first adjusting member 45, by manually pushing the pressure rod 473 to move by the staff, the pressure rod 473 pushes the anti-blocking plate 471, and the thimble 472 is inserted into the liquid suction hole 426 accordingly to remove the blockage. Alternatively, a linear driving component such as an electric telescopic rod, a hydraulic cylinder or a pneumatic cylinder can be installed on the pressure rod 473 to push it, so as to realize automatic cleaning. It should be noted that the air pressure during suction can be monitored in real time by installing a pneumatic sensor. When it is detected that the air pressure is lower than the set threshold value, the control component automatically starts the cleaning program, and the anti-blocking plate 471 moves under the action of the driving component, and the thimble 472 is inserted into the liquid suction hole 426 to remove the blockage;

[0043] In an embodiment of the present invention, as Figure 6 shown, another way of combining the anti-blocking hole assembly 47 and the second adjusting member 46 is provided. A second spring 474 is arranged on the pressure rod 473, and the elastic force of the second spring 474 acts on the anti-blocking plate 471 to make it tend to move away from the liquid suction hole 426. The top of the pressure rod 473 is located between the negative pressure suction member 42 and the frame body 41. When anti-blocking hole operation is required, the second adjusting member 46 is driven to move each negative pressure suction member 42 in the direction close to the frame body 41. The pressure rod 473 located between the negative pressure suction member 42 and the frame body 41 is blocked by the inner wall of the frame body 41 and compresses the second spring 474, and pushes the anti-blocking plate 471 to insert the thimble 472 into the liquid suction hole 426, effectively removing the blockage.

[0044] It should be noted that each negative pressure suction member 42 is interconnected through a suction pipeline and is connected to an external negative pressure source. The sucked etching solution flows back to an external processing device for collection and processing.

[0045] In an embodiment of the present invention, the frame body 41 is slidably installed on the base 6, and a driving member (not shown in the figure) for driving the frame body 41 to move reciprocally is arranged on the base 6;

[0046] In an embodiment of the present invention, a specific example of a driving member is provided. The driving member is a cylinder, an electric telescopic rod, or a hydraulic cylinder (not shown in the figure). The cylinder body of the cylinder, the cylinder body of the hydraulic cylinder, or the cylinder body of the electric telescopic rod is installed on the base 6. The piston rod of the cylinder, the piston rod of the hydraulic cylinder, or the push rod of the electric telescopic rod is connected to the frame body 41. The driving member realizes the movement of the frame body 41 through a control signal.

[0047] In an embodiment of the present invention, another specific example of a driving member is provided. The driving member is a servo motor. The output shaft of the servo motor is connected to the frame body 41 through a transmission device. The transmission device can be a gear rack or a synchronous belt. After receiving the control signal, the servo motor precisely controls the reciprocating movement of the frame body 41 to ensure the stable and efficient operation of the mechanism.

[0048] Only some exemplary embodiments of the present invention have been described above by way of illustration. Without doubt, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the protection scope of the present invention.

Claims

1. A PCB multi-layer board etching machine, comprising a conveying mechanism (2) and an etching mechanism (3), characterized in that, It further includes a cleaning mechanism (4), the cleaning mechanism (4) includes a frame body (41), below the frame body (41), there are alternately distributed negative pressure suction members (42) and bull's-eye universal rollers (43), the negative pressure suction members (42) are used to suck the etching solution on the surface of the PCB board (1), when the rolling ball (432) of the bull's-eye universal roller (43) contacts the surface of the PCB board (1), there is a gap (5) between the bottom of the negative pressure suction member (42) and the surface of the PCB board (1), the cleaning mechanism (4) can reciprocate in a direction perpendicular to the moving direction of the PCB board (1), and the reciprocating distance is greater than the distance between adjacent two negative pressure suction members (42).

2. The PCB multi-layer board etching machine according to claim 1, characterized in that, The negative pressure suction member (42) is slidably installed below the frame body (41) through four guide posts (44).

3. The PCB multi-layer board etching machine according to claim 2, characterized in that, One side of the negative pressure suction member (42) is provided with a first adjusting member (45), which is used to drive the negative pressure suction member (42) to move in the vertical direction to adjust the size of the gap (5).

4. A PCB multi-layer board etching machine according to claim 3, characterized in that, The first adjusting member (45) includes a first threaded rod, one end of the first threaded rod is rotatably connected to the top of the negative pressure suction member (42), and the surface of the first threaded rod is threadedly connected to the inner wall of the frame body (41).

5. A PCB multi-layer board etching machine according to claim 2, characterized in that, The wheel seat (431) of the bull's-eye universal roller (43) is spherical, a tapered groove (421) is opened on one side of the negative pressure suction member (42) close to the bull's-eye universal roller (43), a first spring (422) is sleeved on the guide post (44), the elastic force of the first spring (422) acts on the negative pressure suction member (42) to make it tend to move away from the frame body (41), a bushing (423) is sleeved on the guide post (44), a first chute (424) is opened on the frame body (41) along its length direction, the bushing (423) is slidably connected to the first chute (424), and a second adjusting member (46) is arranged on the frame body (41), which is used to drive each bull's-eye universal roller (43) to approach or move away from each other at equal distances.

6. A PCB multi-layer board etching machine according to claim 5, characterized in that, The second adjusting member (46) includes a sliding seat (461) installed on the top of each bull's-eye universal roller (43), a second chute (462) for the sliding seats (461) to slide is opened on the frame body (41), the second adjusting member (46) further includes a second threaded rod (463), and the second threaded rod (463) is threadedly connected to the inner walls of the sliding seats (461).

7. A PCB multi-layer board etching machine according to claim 1 or 6, characterized in that, The negative pressure suction member (42) includes a storage body (425), a plurality of liquid suction holes (426) are opened at the bottom of the storage body (425), an anti-clogging hole assembly (47) is arranged in the storage body (425), the anti-clogging hole assembly (47) includes an anti-clogging plate (471), the anti-clogging plate (471) is slidably connected to the inner wall of the storage body (425), a thimble (472) corresponding to each liquid suction hole (426) is arranged at the bottom of the anti-clogging plate (471), and a pressure rod (473) is fixedly connected to the top of the anti-clogging plate (471).

8. A PCB multi-layer board etching machine according to claim 7, characterized in that, A second spring (474) is provided on the pressure rod (473), and the elastic force of the second spring (474) acts on the anti-blocking plate (471) to make it tend to move away from the liquid suction hole (426). The top of the pressure rod (473) is located between the negative pressure suction member (42) and the frame body (41).

9. The PCB multi-layer board etching machine according to claim 1, characterized in that, The frame body (41) is slidably mounted on the base (6), and a driving member for driving the frame body (41) to reciprocate is provided on the base (6).

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