A self-weighted clamping plate type thin plate hanger

Abstract

The utility model discloses a self-weighted clamping plate type thin plate hanger, which includes an upper frame and a lower frame, wherein the upper frame is provided with a plurality of upper clamps for clamping the upper edge of a PCB board, and the lower frame is provided with a plurality of lower clamps for clamping the lower edge of the PCB board, and at least one rack guide mechanism is provided between the upper frame and the lower frame, wherein the rack guide mechanism includes a gear and a vertically arranged rack, wherein the gear is rotationally connected to the upper frame, the rack is slidingly connected to the upper frame, and the rack and the gear are meshed with each other, and the lower end of the rack is connected to the lower frame. Compared with the prior art, the utility model can balance the stress of the board surface, thereby preventing the board surface from bending, especially when the PCB board is a thin plate, it can avoid the tearing of the thin plate, thereby improving the quality of the electroplating process.

Description

Technical Field

[0001] The utility model relates to a PCB plate electroplating hanger, in particular to a self-weighted clamping plate type thin plate hanger. Background Art

[0002] In the traditional vertical continuous electroplating technology application, there are two types of splint hangers:

[0003] 1. Only the upper clamping plate drives the board to work in the electroplating tank. When the chemical reaction of the solution is sensitive, the turbulence caused by the jet flow in the electroplating tank causes the board to float between the guide wheels or guide strips on both sides. At the same time, the board will contact the guide wheels or guide strips and produce chemical reactions with the solution, causing scratches on the board surface. For example, when electroplating 20um, a groove of about 1-6um is measured by a thousand-fold optical microscope, which will affect the product quality to varying degrees. When the depth of the scratched groove is greater than 3um, the board surface cannot be leveled by grinding, which directly leads to the board surface being irreparable and scrapped;

[0004] 2. Use upper and lower clamps to position the frame height before placing the board or after the clamp is opened, and fix the position with upper and lower racks or support the frame with springs. The advantage of this method is that the board surface in the electroplating tank will no longer contact the guide wheel or guide bar, and will not be scratched due to the sensitive chemical reaction of some medicines. However, there are also shortcomings. When producing thin plates below 0.2mm, when the height deviation of the board surface is greater than 1mm, when the board is placed, ruffles or board corners will be bent on the board surface, so that the electroplating is completed. After that, it will stretch the length of the board or cause the board to be stuck in the electroplating tank due to the bending of the board corners; when producing thin plates below 0.06um, when the side spray flow rate increases, it will impact and tear the clamp position, causing tearing of the board surface around the clamp; when producing thin plates below 0.3mm, when the jet flow gradually increases, the lateral impact force on the board surface increases. When the balance force of the board surface is lost, it will drive the board surface to bend and cause the rack to slide upward unilaterally. Therefore, after the electroplating is completed, the board is bent, and in severe cases it will even stick to the frame, resulting in poor uniformity and hole filling performance, seriously affecting product quality. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a self-weighted clamping plate type thin plate hanger which can balance the stress of the plate surface, prevent the plate surface from bending and avoid the tearing of the thin plate, in view of the shortcomings of the prior art.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions.

[0007] A self-weighted clamping plate type thin plate hanger, comprising an upper frame and a lower frame, wherein the upper frame is provided with a plurality of upper clamps for clamping the upper edge of a PCB board, and the lower frame is provided with a plurality of lower clamps for clamping the lower edge of the PCB board, and at least one rack guide mechanism is provided between the upper frame and the lower frame, and the rack guide mechanism comprises a gear and a vertically arranged rack, the gear is rotatably connected to the upper frame, the rack is slidably connected to the upper frame, and the rack and the gear are meshed with each other, and the lower end of the rack is connected to the lower frame.

[0008] Preferably, two rack guide mechanisms are provided between the upper frame and the lower frame, and the two rack guide mechanisms are respectively close to the left and right sides of the upper frame and the lower frame.

[0009] Preferably, the rack and the upper frame are provided with relatively aligned pin holes, and pins are inserted into the pin holes.

[0010] Preferably, the rack includes a tooth portion of a preset length, and the tooth portion is close to an upper end of the rack.

[0011] Preferably, the rack guide mechanism includes a mounting seat, and the rack and the gear are both arranged on the mounting seat.

[0012] Preferably, two upper and lower waist-shaped holes are opened near the lower end of the rack, and two upper and lower limit screws are provided on the lower frame, and the two limit screws pass through the two waist-shaped holes respectively.

[0013] In the self-weighted clamping plate type thin plate hanger disclosed by the utility model, a plurality of upper clamps and a plurality of lower clamps are used to clamp the PCB board between the upper frame and the lower frame. After the PCB board is clamped, based on the mutual meshing relationship between the rack and the gear, the lower end of the PCB board can be naturally straightened and stretched, thereby realizing the self-weighted clamping function of the PCB board. Compared with the prior art, the utility model can balance the stress of the board surface, thereby preventing the board surface from bending, especially when the PCB board is a thin plate, it can avoid the thin plate from tearing, thereby improving the quality of the electroplating process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a front view of the self-weighted clamping plate type thin plate hanger of the utility model;

[0015] Figure 2 This is a side view of the self-weighted clamping plate type thin plate hanger of the utility model;

[0016] Figure 3 It is a structural diagram of the connection between the rack and the lower frame;

[0017] Figure 4 This is the structural diagram of the rack guide mechanism. DETAILED DESCRIPTION

[0018] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments.

[0019] The utility model discloses a self-weighted clamping plate type thin plate hanger, combined with Figures 1 to 4 As shown, it includes an upper frame 1 and a lower frame 2, the upper frame 1 is provided with a plurality of upper clamps 3 for clamping the upper edge of the PCB board 100, the lower frame 2 is provided with a plurality of lower clamps 4 for clamping the lower edge of the PCB board 100, at least one rack guide mechanism 6 is provided between the upper frame 1 and the lower frame 2, the rack guide mechanism 6 includes a gear 60 and a vertically arranged rack 61, the gear 60 is rotatably connected to the upper frame 1, the rack 61 is slidably connected to the upper frame 1, and the rack 61 is meshed with the gear 60, and the lower end of the rack 61 is connected to the lower frame 2.

[0020] In the above structure, the PCB board 100 is clamped between the upper frame 1 and the lower frame 2 using multiple upper clamps 3 and multiple lower clamps 4. After the PCB board 100 is clamped, based on the mutual meshing relationship between the rack 61 and the gear 60, the lower end of the PCB board 100 can be naturally straightened and stretched, thereby realizing the self-weighted clamping function of the PCB board 100. Compared with the prior art, the utility model can balance the stress of the board surface, thereby preventing the board surface from bending, especially when the PCB board 100 is a thin plate, it can avoid the thin plate from tearing, thereby improving the quality of the electroplating process.

[0021] In order to balance the stress on the left and right sides, in this embodiment, two rack guide mechanisms 6 are provided between the upper frame 1 and the lower frame 2, and the two rack guide mechanisms 6 are respectively close to the left and right sides of the upper frame 1 and the lower frame 2. The two rack guide mechanisms 6 are bilaterally symmetrical structures, which can make the left and right ends of the lower frame 2 droop synchronously, thereby balancing the stress of the PCB board 100.

[0022] In practical applications, the relative position of the rack 61 and the upper frame 1 can also be limited by pins, see Figure 1 The rack 61 and the upper frame 1 are provided with relatively aligned pin holes 62, and a pin 63 is inserted into the pin hole 62.

[0023] See also Figure 4 In this embodiment, the rack 61 includes a tooth portion 610 of a preset length, and the tooth portion 610 is close to the upper end of the rack 61. In practical applications, the upper end of the rack 61 does not need to be immersed in the solution, so the rack 61 only needs to be provided with the tooth portion 610 at the upper end, and the main body of the rack 61 to the lower end can be a straight rod with a smooth surface.

[0024] In order to more conveniently install the rack guide mechanism 6, in this embodiment, see Figure 4 The rack guide mechanism 6 includes a mounting seat 64 , and the rack 61 and the gear 60 are both arranged on the mounting seat 64 .

[0025] As a preferred method, see Figure 4 The rack 61 is provided with two upper and lower waist-shaped holes 611 near the lower end, and the lower frame 2 is provided with two upper and lower limit screws 612, which pass through the two waist-shaped holes 611 respectively. In this embodiment, by providing two waist-shaped holes 611 and two limit screws 612, the limit screws 612 can slide up and down relative to the waist-shaped holes 611, so that the self-weighting stress between the lower clamp 4 and the PCB board 100 can be adjusted.

[0026] In actual applications, the fixed hole of the lower clamp installation flat is made into a long strip hole and embedded with a sliding shaft sleeve. When the upper and lower clamps clamp the board, the lower clamp installation flat can tighten the board again by its own weight, which can prevent the board surface from producing ruffles or bending of the board corners. At the same time, since the lower clamp is installed with a long hole, when the jet exceeds a certain flow rate, it can also drive the board surface to slide, reduce the impact force, and prevent the jet from tearing the board surface at the clamp position.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the technical scope of the present invention should be included in the scope of protection of the present invention.

Claims

1. A self-weighted clamping plate type thin plate hanger, characterized in that: The invention comprises an upper frame (1) and a lower frame (2), wherein the upper frame (1) is provided with a plurality of upper clamps (3) for clamping the upper edge of a PCB board (100), and the lower frame (2) is provided with a plurality of lower clamps (4) for clamping the lower edge of the PCB board (100). At least one rack guide mechanism (6) is provided between the upper frame (1) and the lower frame (2), and the rack guide mechanism (6) comprises a gear (60) and a vertically arranged rack (61), wherein the gear (60) is rotatably connected to the upper frame (1), the rack (61) is slidably connected to the upper frame (1), and the rack (61) and the gear (60) are meshed with each other, and the lower end of the rack (61) is connected to the lower frame (2).

2. The self-weighted clamping plate type thin plate hanger according to claim 1, characterized in that: Two rack guide mechanisms (6) are provided between the upper frame (1) and the lower frame (2), and the two rack guide mechanisms (6) are respectively close to the left and right sides of the upper frame (1) and the lower frame (2).

3. The self-weighted clamping plate type thin plate hanger according to claim 1, characterized in that: The rack (61) and the upper frame (1) are provided with relatively aligned pin holes (62), and a pin (63) is inserted into the pin hole (62).

4. The self-weighted clamping plate type thin plate hanger according to claim 1, characterized in that: The rack (61) comprises a tooth portion (610) of a preset length, wherein the tooth portion (610) is close to an upper end of the rack (61).

5. The self-weighted clamping plate type thin plate hanger according to claim 1, characterized in that: The rack guide mechanism (6) comprises a mounting seat (64), and the rack (61) and the gear (60) are both arranged on the mounting seat (64).

6. The self-weighted clamping plate type thin plate hanger according to claim 1, characterized in that: Two upper and lower waist-shaped holes (611) are provided near the lower end of the rack (61), and two upper and lower limit screws (612) are provided on the lower frame (2), and the two limit screws (612) pass through the two waist-shaped holes (611) respectively.

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