Silver stripping shield and silver stripping apparatus

Abstract

The utility model discloses a kind of silver stripping shielding devices, and discloses silver stripping equipment with silver stripping shielding device, wherein silver stripping shielding device includes two shielding members, the shielding member is used to shield current, two The shielding member is spaced apart along the arrangement direction of two silver stripping electrode plate, the passage for the workpiece is defined between two The shielding member, and each The shielding member is located between one The silver stripping electrode plate and The workpiece, the current between The silver stripping electrode plate and The workpiece can enter from the gap between two The shielding member and carry out current output to The workpiece, to strip the silver layer of non-functional area on The workpiece. After silver stripping electrode plate is energized, two sides high current can be shielded by shielding member, current is wound to shielding member middle to carry out current output to workpiece to strip the silver layer of non-functional area, can solve the situation of workpiece silver stripping two sides high current, middle low current, improve the problem such as peeling injury, plating uneven.

Description

Technical Field

[0001] This utility model relates to the field of silver stripping technology, and in particular to a silver stripping shielding device and silver stripping equipment. Background Technology

[0002] In high-end manufacturing fields such as electronic components and precision connectors, localized silver plating is widely used to meet the functional requirements of specific areas (such as conductive contacts and signal transmission interfaces). Specifically, by retaining the silver layer only in the target area (silver-plated area) on the workpiece surface, the silver layer in other non-functional areas (non-silver-plated areas) needs to be removed through a silver stripping process to avoid ineffective conductivity, short circuits, or waste of precious metals. Among these processes, the electroplating silver stripping step is a crucial post-processing step in localized silver plating, and its technical reliability directly affects the final performance of the product (such as conductivity and solderability) and production costs.

[0003] Currently, the mainstream silver stripping process in industrial production mostly adopts electrochemical silver stripping. Its core principle is to utilize an electrolytic cell reaction, selectively dissolving the silver layer in non-silver-plated areas by controlling the electrode layout and current parameters. In existing technologies, the most common silver stripping section design is a "two-sided silver stripping electrode connection" structure: the workpiece (sheet) to be processed is placed horizontally or vertically between two parallel electrodes (usually anodes or cathodes), and current is passed through the two electrodes to form an electrolytic circuit. Under the action of the electric field, the silver layer in the non-functional areas of the sheet surface undergoes an electrolytic reaction (silver ions dissolve into the electrolyte), thereby achieving the stripping of excess silver layer.

[0004] However, the above process has significant technical drawbacks: because the silver stripping electrodes are only symmetrically arranged on both sides of the sheet, the current distribution on the sheet surface exhibits obvious non-uniformity. The current density is significantly higher in the areas on both sides of the sheet because they are closer to the electrodes, while the current density is lower in the middle area because it is farther from the electrodes. This difference in current distribution directly affects the silver stripping effect and the integrity of the silver layer in the functional areas.

[0005] Firstly, uneven current distribution leads to damage to the silver plating area. Because the workpiece (sheet material) has a sheet-like structure, when energized using electrodes on both sides, the current preferentially conducts along the edge region between the electrodes and the workpiece (skin effect). This results in a higher current density on both sides of the workpiece near the electrodes, while the current density in the middle region is lower (even forming a current "dead zone"). This uneven current distribution directly affects the dissolution behavior of the silver layer: although the silver layer in the non-silver plating areas of the high current density regions on both sides can dissolve quickly, if the silver plating area happens to be located in the middle of the workpiece or close to the electrodes, the high current density will cause the silver layer in the silver plating area to be damaged due to over-electrolysis, resulting in plating peeling (such as pinholes, scratches, or localized detachment on the silver layer surface) or thinning (insufficient plating thickness).

[0006] Secondly, the reliability of downstream applications decreases. For applications such as chip wire bonding and high-frequency connectors, where the integrity of the silver plating layer is extremely important, the thickness and continuity of the silver plating area directly affect the wire bonding strength (such as the pull-out force of gold wire bonding) and signal transmission stability. If the silver plating area is insufficient in thickness or damaged due to uneven current distribution during the silver stripping process, it can lead to defects such as poor soldering and broken wires during chip wire bonding, seriously affecting the product yield and service life.

[0007] Third, due to insufficient current density in the middle area of ​​the workpiece, the silver layer in non-functional areas may not be completely removed, requiring secondary processing and reducing production efficiency.

[0008] Therefore, there is an urgent need to develop an electroplating stripping section design that provides uniform current distribution and reliable protection for the silver plating area, in order to solve the problem of damage to the silver plating area caused by uneven current in the existing two-sided electrode connection structure, and improve the yield and application reliability of locally silver-plated products. Utility Model Content

[0009] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a silver stripping shielding device that can optimize current distribution and improve the uniformity of the plating thickness on the workpiece after silver stripping.

[0010] This utility model also proposes a silver stripping device with the above-mentioned silver stripping shielding device.

[0011] According to a first aspect of the present invention, a silver stripping shielding device is applied in an electrolytic cell having silver stripping electrodes. A workpiece is located in the electrolytic cell and between two silver stripping electrodes. The silver stripping shielding device includes two shielding members for shielding current. The two shielding members are spaced apart along the arrangement direction of the two silver stripping electrodes. A channel for the workpiece to pass through is defined between the two shielding members. Each shielding member is located between one of the silver stripping electrodes and the workpiece. The current between the silver stripping electrode and the workpiece can enter from the gap between the two shielding members and output current to the workpiece to strip the silver layer in the non-functional area on the workpiece.

[0012] The silver stripping shielding device according to the present utility model has at least the following beneficial effects: after the silver stripping electrode plate is energized, the high current on both sides will be shielded by the shielding component, and the current will be routed to the middle of the shielding component to output current to the workpiece to strip the silver layer in the non-functional area. This can solve the problem of high current on both sides and low current in the middle when stripping silver from the workpiece, and improve problems such as peeling damage and uneven plating.

[0013] According to some embodiments of the present invention, the shielding member includes a first shielding part and a second shielding part, wherein the first shielding part is used to shield part of the upper side of the workpiece, and the second shielding part is used to shield part of the lower side of the workpiece.

[0014] According to some embodiments of the present invention, the silver stripping and shielding device further includes a mounting member, each of the shielding members being mounted on a mounting member, the mounting member being used to define the relative positional relationship between the first shielding portion and the second shielding portion.

[0015] According to some embodiments of the present invention, the first shielding part is inclined upward, the second shielding part is inclined downward, and the sides of the first shielding part and the second shielding part near the silver stripping electrode plate abut against each other.

[0016] According to some embodiments of the present invention, the mounting member is provided with a V-shaped groove, the first shielding part is attached to the upper side wall of the V-shaped groove by a first clamping member, and the second shielding part is attached to the lower side wall of the V-shaped groove by a second clamping member.

[0017] According to some embodiments of the present invention, the silver stripping and shielding device further includes a connecting component that connects two shielding members.

[0018] According to some embodiments of the present invention, the connecting assembly is provided with an adjustment mechanism, which is used to adjust the distance between the two shielding members.

[0019] According to some embodiments of the present invention, the adjusting mechanism includes a first clamping member, which is used to connect the shielding member. The connecting assembly includes a connecting plate and a supporting plate. The supporting plate is fixedly connected to the first clamping member and supports the connecting plate. The connecting plate is provided with a waist-shaped hole. The first clamping member is provided with a threaded portion. The threaded portion passes through the waist-shaped hole and is connected to a nut so that the connecting plate and the first clamping member remain fixed.

[0020] According to some embodiments of the present invention, the shielding member is provided with a plurality of through holes spaced apart.

[0021] The silver stripping device according to a second aspect embodiment of the present invention includes:

[0022] Electrolytic cell;

[0023] Two silver-stripping electrode plates are respectively disposed on both sides of the electrolytic cell and arranged along the length of the electrolytic cell;

[0024] The silver stripping shielding device of the first aspect of this utility model is located between the two silver stripping plates.

[0025] The silver stripping device according to the embodiments of the present invention has at least the following beneficial effects: by adopting the silver stripping shielding device of the first aspect of the present invention, the situation of high current on both sides and low current in the middle during silver stripping of the workpiece can be solved, and problems such as peeling damage and uneven plating can be improved.

[0026] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0028] Figure 1 This is a schematic diagram of the silver stripping device according to an embodiment of the present utility model;

[0029] Figure 2 for Figure 1 The diagram shows the combination of the silver stripping shielding device and the silver stripping electrode.

[0030] Figure label:

[0031] 100. Workpiece; 110. Electrolytic cell; 120. Silver stripping electrode plate; 130. Shielding component; 131. First shielding part; 132. Second shielding part; 133. Through hole; 140. Channel; 150. Gap; 160. Mounting component; 170. First clamping component; 171. Threaded part; 172. Nut; 180. Second clamping component; 191. Connecting plate; 192. Support plate; 193. Waist-shaped hole. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0035] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0036] The uneven current distribution caused by the electrode arrangement in existing electroplating silver stripping processes not only affects the integrity and thickness accuracy of the silver layer in the functional areas of the product, but also causes quality problems such as poor wire bonding in downstream chips, seriously restricting product yield and production stability. In existing technologies, attempts to improve the above problems mainly include adjusting the electrode spacing and optimizing the current parameters (such as pulse current). However, due to the geometric characteristics of sheet-like workpieces, the "edge effect" of current distribution is difficult to completely eliminate. While chemical or mechanical silver stripping can avoid the current distribution problem, it has drawbacks such as poor selectivity of the silver plating area (easy to corrode), large surface damage (mechanical stress), or high environmental costs, which cannot meet the precision machining requirements of high-end manufacturing fields.

[0037] The following reference Figure 1 and Figure 2 This explains how the silver stripping shielding device and silver stripping equipment of this utility model solve the above-mentioned problems.

[0038] Reference Figure 1The silver stripping device of this utility model embodiment includes an electrolytic cell 110, two silver stripping electrodes 120, and a silver stripping shielding device. The electrolytic cell 110 serves as a reaction vessel, filled with an electrolyte (such as a solution containing a silver complexing agent) to provide an ionic environment and spatial constraint for the electrolytic reaction. The workpiece 100 is immersed in the electrolyte for silver stripping. The two silver stripping electrodes 120 are symmetrically arranged on both sides of the electrolytic cell 110, extending along the length of the electrolytic cell 110 (consistent with the conveying direction of the workpiece 100), and connected to a power source via wires. The workpiece 100 is located in the electrolytic cell 110 and between the two silver stripping electrodes 120, with the silver stripping shielding device located between the two silver stripping electrodes 120. The silver stripping shielding device includes two shielding elements 130, which are used to shield the current, meaning that the shielding elements 130 can independently block the current from directly passing through their solid parts. Two shielding members 130 are spaced apart along the arrangement direction of the two silver stripping plates 120, that is, the arrangement direction of the two shielding members 130 is the same as the arrangement direction of the two silver stripping plates 120, which is perpendicular to the length of the silver stripping plates 120. The two shielding members 130 are symmetrically installed on both sides of the electrolytic cell 110, and each shielding member 130 extends along the "length direction" of the electrolytic cell 110. A channel 140 is defined between the two shielding members 130 for the workpiece 100 to pass through. The channel 140 is the space formed by the two shielding members 130, and the workpiece 100 passes through the channel 140 to ensure that the shielding members 130 accurately wrap around the workpiece 100. Each shielding element 130 is located between a silver stripping electrode 120 and a workpiece 100, i.e., the left shielding element 130 is between the left silver stripping electrode 120 and the workpiece 100, and the right shielding element 130 is between the right silver stripping electrode 120 and the workpiece 100, thereby preventing the current from directly reaching the side of the workpiece 100 and avoiding the problem of high current on both sides when the workpiece 100 is stripped of silver. The current between the silver stripping electrode 120 and the workpiece 100 can enter through the gap 150 between the two shielding elements 130 and output current to the workpiece 100 to strip the silver layer in the non-functional areas of the workpiece 100. Due to the shielding effect of the shielding element 130, the current between the silver stripping electrode 120 and the workpiece 100 cannot directly pass through the area covered by the shielding element 130, but can only enter through the gap 150 between the two shielding elements 130 (i.e., the opening of the channel 140), and accurately act on the corresponding area of ​​the workpiece 100. The gap 150 is defined by the upper and / or lower edge of the shielding member 130.

[0039] When the silver stripping equipment is running, the silver stripping electrode 120 is energized (taking the silver stripping electrode 120 as a cathode plate as an example), and the workpiece 100 acts as the anode. The current needs to bypass the physical structure of the shielding member 130, mainly entering the workpiece 100 through the gap 150 between the two shielding members 130, rather than directly reaching the workpiece 100 from the electrode plate in a straight line. Ag in the electrolyte... +The current moves directionally under the influence of an electric field and ultimately acts on the surface of the workpiece 100 through the current path guided by the shielding member 130, achieving the peeling off of the silver layer in the non-functional area. Due to the obstruction of the shielding member 130, the current density at the edge of the workpiece 100 is reduced, preventing excessive etching of the silver layer in the functional area. The current is uniformly applied to the workpiece 100 through the gap 150, ensuring the stable peeling off of the silver layer in the non-functional area while protecting the integrity and thickness of the silver layer in the functional area. The shielding member 130 directly blocks or weakens the transmission of current to the silver-plated area of ​​the workpiece 100 through physical isolation or electrical shielding (such as grounding to reduce potential). Even if the silver-plated area is close to the electrode, the presence of the shielding member 130 ensures that its surface current density is below the silver layer dissolution threshold, thereby avoiding peeling damage or thickness reduction and ensuring the functional reliability of scenarios such as chip wire bonding.

[0040] Reference Figure 1 The shielding member 130 includes a first shielding portion 131 and a second shielding portion 132. The first shielding portion 131 is used to shield the upper side of part of the workpiece 100 (i.e., the part of the workpiece 100 with its surface facing upwards) to shield the current from above and prevent excessive etching of the silver layer on the upper part of the workpiece 100 due to excessive current density. The second shielding portion 132 is used to shield the lower side of part of the workpiece 100 (i.e., the part of the workpiece 100 with its surface facing downwards) to shield the current from below and prevent damage to the silver layer on the lower part of the workpiece 100 due to current concentration. The first shielding portion 131 and the second shielding portion 132 form a symmetrical protective structure in space, which is highly compatible with the double-sided processing requirements of the workpiece 100. When the silver stripping electrode 120 is energized, the current needs to bypass the first shielding part 131 and the second shielding part 132. The current on the upper side enters the position of the workpiece 100 through the gap 150 between the two first shielding parts 131, and the current on the lower side enters the position of the workpiece 100 through the gap 150 between the two second shielding parts 132.

[0041] Reference Figure 1 The silver stripping shielding device also includes a mounting member 160, with each shielding member 130 mounted on a mounting member 160. The mounting member 160 defines the relative positional relationship between the first shielding part 131 and the second shielding part 132. The mounting member 160 serves as a support structure for the shielding member 130, precisely fixing the relative spatial position of the first shielding part 131 and the second shielding part 132, ensuring a stable spacing and coverage area between the upper and lower shielding parts. The mounting member 160 provides rigid support, enhancing the overall rigidity of the shielding member 130 in the liquid environment of the electrolytic cell 110 or during the transport of the workpiece 100. This prevents relative displacement or deformation of the first and second shielding parts 132 due to external forces (such as liquid impact or friction from the workpiece 100), ensuring the stability of shielding accuracy during long-term use.

[0042] Reference Figure 2The first shielding part 131 is inclined upwards, meaning that the upper edge of the first shielding part 131 (the end away from the silver stripping electrode 120) is higher than the lower edge (the end near the silver stripping electrode 120), forming an "upturned" slope. The second shielding part 132 is inclined downwards, meaning that the lower edge of the second shielding part 132 (the end away from the silver stripping electrode 120) is lower than the upper edge (the end near the silver stripping electrode 120), forming a "downward" slope. Furthermore, the sides of the first shielding part 131 and the second shielding part 132 near the silver stripping electrode 120 abut against each other, and the shielding member 130 as a whole forms a "V" shape structure. That is, the two shielding parts are in physical contact on the side near the silver stripping electrode 120, forming a continuous current barrier to ensure that the electrode current can only enter the workpiece 100 area through the preset gap 150.

[0043] It is understandable that the shielding component 130 can also be set as a whole in a "C" shape or a "[" shape. In comparison, the "V" shaped shielding component 130 can fit more closely to the workpiece 100 and reduce the overall space occupied.

[0044] Reference Figure 1The mounting component 160 is provided with a V-shaped groove. The first shielding part 131 is pressed against the upper side wall of the V-shaped groove by the first clamping member 170, and the second shielding part 132 is pressed against the lower side wall of the V-shaped groove by the second clamping member 180. The "V-shaped groove" on the mounting component 160 is the positioning reference of the shielding part, and its structural features directly determine the relative angle and positional relationship between the first shielding part 131 and the second shielding part 132. The V-shaped groove is composed of an "upper side wall" and a "lower side wall", and the two side walls form a certain angle (the angle matches the tilt angle of the first shielding part 131 and the second shielding part 132), forming a groove space similar to the shape of a "V". This angle needs to be adapted to the tilt angle of the first shielding part 131 (tilted upward) and the second shielding part 132 (tilted downward) to ensure that the shielding part can naturally form a preset tilt posture after installation. The first shielding part 131 is firmly pressed against the "upper sidewall" of the V-groove by the first clamping member 170 (such as a bolt, clip, elastic pressure plate, etc.), so that the back of the shielding part is tightly fitted with the upper sidewall, and its tilt angle and spatial position are defined by the shape of the groove wall. Similarly, the second shielding part 132 is pressed against the "lower sidewall" of the V-groove by the second clamping member 180 (such as a bolt, clip, elastic pressure plate, etc.), and its back is tightly fitted with the lower sidewall, thereby fixing its angle and position. The sidewall angle of the V-groove is a preset "reference angle". The first shielding part 131 and the second shielding part 132 can directly inherit this angle by fitting against the groove wall, without the need to separately calibrate the tilt angle of the first shielding part 131 and the second shielding part 132 and the included angle between them, ensuring the consistency of the shielding angle of the same batch of mounting parts 160. The pressure generated by the first clamping member 170 and the second clamping member 180 makes the first shielding part 131 and the second shielding part 132 "rigidly fit" with the V-shaped groove wall, which can effectively resist external forces such as liquid impact in the electrolytic cell 110 and friction when the workpiece 100 passes through, and prevent the shielding part from loosening or shifting.

[0045] Reference Figure 1 and Figure 2 The silver stripping shielding device also includes a connecting assembly that connects two shielding elements 130. The connecting assembly is a structural component used to mechanically connect the two shielding elements 130. Its function is to connect the left shielding element 130 and the right shielding element 130 (corresponding to the two silver stripping plates 120 respectively) into a synchronized whole, rather than having them exist independently. Through the design of the length or span of the connecting assembly, the distance between the two shielding elements 130 (i.e., the width of the channel 140 between them) is precisely defined to match the width of the workpiece 100. If the channel 140 is too wide, current may leak into the functional area from the gaps on both sides of the workpiece 100; if it is too narrow, it may obstruct the passage of the workpiece 100 or scratch its surface. Connecting the two independent shielding elements 130 into a whole improves the device's ability to resist external forces such as electrolyte impact and workpiece 100 friction, and reduces unilateral swaying or deformation (e.g., preventing one side of the shielding element 130 from tilting towards the plate due to force, causing current shielding failure).

[0046] Understandably, the connecting assembly includes an adjustment mechanism for adjusting the spacing between the two shielding members 130. This adjustment mechanism is an integrated, operable structure on the connecting assembly that can change the width of the channel 140 between the left and right shielding members 130 to accommodate silver-peeling workpieces 100 of varying thicknesses and widths (such as sheet materials of different specifications). Electronic components, precision connectors, and other products typically come in various sizes and specifications. The adjustment mechanism allows the same silver-peeling shielding device to meet the silver-peeling requirements of different workpiece sizes 100 by adjusting the spacing, eliminating the need to customize shielding devices for each workpiece 100 and reducing equipment costs.

[0047] Reference Figure 1 and Figure 2 The adjustment mechanism includes a first clamping member 170, which connects to the shielding member 130. The connecting assembly includes a connecting plate 191 and a support plate 192. The support plate 192 is fixedly connected to the first clamping member 170 and supports the connecting plate 191. The connecting plate 191 has a slotted hole 193. The first clamping member 170 has a threaded portion 171, which passes through the slotted hole 193 and connects with a nut 172 to keep the connecting plate 191 and the first clamping member 170 fixed. The first clamping member 170 is directly connected to the shielding member 130 and performs the dual functions of "connection" and "pressure application". It has a threaded portion 171 (external thread structure) for cooperating with the nut 172 to achieve fastening. The connecting plate 191, as the "connecting component" of the adjustment mechanism, has a slotted hole 193 (an elongated through hole, with the major axis in the adjustment direction) for accommodating the threaded portion 171 of the first clamping member 170. The oblong hole 193 allows the threaded portion 171 to move along its long axis within the hole, enabling coarse adjustment of the spacing between the shielding members 130. The connecting plate 191 is fixed between the support plate 192 and the first clamping member 170 via a threaded connection, limiting the relative displacement of the two shielding members 130 in the adjustment direction (e.g., vertical direction) and ensuring positional stability after adjustment. When the spacing between the shielding members 130 needs adjustment, the nut 172 is loosened. At this time, the threaded portion 171 of the first clamping member 170 can slide freely along its long axis within the oblong hole 193 of the connecting plate 191, thereby changing the spacing between the two shielding members 130. After the spacing between the shielding members 130 is adjusted to the target value, the nut 172 is tightened, locking the first clamping member 170 to the connecting plate 191 through the friction of the threads. At this time, the threaded portion 171 of the first clamping member 170 and the waist-shaped hole 193 of the connecting plate 191 form a "hole-shaft" mating structure, which restricts the relative displacement of the two in any direction (including the adjustment direction and the vertical direction), ensuring that the spacing of the shielding member 130 remains stable during the electrolysis process.

[0048] It should be noted that the adjustment mechanism can also be configured in other structural forms. For example, horizontal guide rails can be set on the left and right sides of the connecting assembly, and the two shielding parts can be slidably connected to the guide rails via sliders. Adjusting bolts can be installed at both ends of the guide rails, and rotating the bolts can push the sliders to move along the guide rails, thereby adjusting the distance between the two shielding parts 130. Alternatively, a lead screw can be set at the center of the connecting assembly, and the shielding parts 130 can be threadedly connected to the lead screw via nuts. A turbine handle can be installed at the top of the lead screw, and rotating the handle can drive the lead screw to rotate, causing the shielding parts to move synchronously, thereby achieving fine adjustment of the distance.

[0049] During the electrolytic silver stripping process, the electrolyte needs to circulate within the electrolytic cell 110 (to remove the stripped silver ions and replenish fresh reagents). If the shielding element 130 is a completely sealed solid structure, a "dead zone" may form between it, the workpiece 100, and the silver stripping electrode 120, leading to poor electrolyte flow and localized electrolyte accumulation (excessive silver ion concentration in the accumulated electrolyte will affect the efficiency of the silver stripping reaction and may even cause reverse deposition of the silver layer). Furthermore, the silver stripping reaction (such as Ag...) + When reduced or oxidized, gases (such as hydrogen and oxygen) will be generated. If the gases cannot be discharged in time, bubbles will form between the workpiece 100 and the shielding part 130. These bubbles will adhere to the surface of the silver-plated area, hindering the normal flow of current and causing the silver layer to peel due to insufficient electrolysis. Bubbles will accumulate in non-silver-plated areas, causing abnormal local current density (such as excessively high current density at the edge of the bubble, resulting in excessive dissolution of the silver layer).

[0050] Reference Figure 1 and Figure 2 The shielding member 130 is provided with multiple spaced through holes 133. These through holes 133 serve as channels for electrolyte flow, allowing the liquid to pass through the shielding member 130, promoting uniform mixing of the electrolyte within the tank, and ensuring a stable reaction environment (e.g., uniform concentration and temperature) in the silver stripping area. The core function of the multiple spaced through holes 133 is to provide a flow path for the electrolyte without affecting the current shielding function, solving the "liquid retention problem" between the shielding member 130 and surrounding components (e.g., the silver stripping electrode 120, the workpiece 100, and the tank wall). The multiple spaced through holes 133 also provide "escape channels" for gas. The spacing of the through holes 133 disperses the gas escape path (rather than concentrating it at a single point), reducing surface disturbances (such as vibration or scratches) on the workpiece 100 caused by bubble bursting.

[0051] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A silver stripping shielding device, used in an electrolytic cell with silver stripping electrodes, wherein the workpiece is located in the electrolytic cell and between two of the silver stripping electrodes, characterized in that, The silver stripping and shielding device includes: Two shielding elements are provided to shield current. The two shielding elements are spaced apart along the arrangement direction of the two silver stripping electrodes. A channel for the workpiece to pass through is defined between the two shielding elements. Each shielding element is located between a silver stripping electrode and the workpiece. Current between the silver stripping electrode and the workpiece can enter from the gap between the two shielding elements and output current to the workpiece to strip the silver layer of non-functional areas on the workpiece.

2. The silver stripping and shielding device according to claim 1, characterized in that, The shielding component includes a first shielding part and a second shielding part. The first shielding part is used to shield part of the upper side of the workpiece, and the second shielding part is used to shield part of the lower side of the workpiece.

3. The silver stripping and shielding device according to claim 2, characterized in that, The silver stripping and shielding device further includes a mounting member, with each shielding member mounted on a mounting member, the mounting member defining the relative positional relationship between the first shielding portion and the second shielding portion.

4. The silver stripping and shielding device according to claim 3, characterized in that, The first shielding part is inclined upward, and the second shielding part is inclined downward, with the sides of the first shielding part and the second shielding part abutting against the silver stripping electrode plate.

5. The silver stripping and shielding device according to claim 4, characterized in that, The mounting component is provided with a V-shaped groove. The first shielding part is attached to the upper side wall of the V-shaped groove by a first clamping member, and the second shielding part is attached to the lower side wall of the V-shaped groove by a second clamping member.

6. The silver stripping and shielding device according to claim 1, characterized in that, The silver stripping and shielding device also includes a connecting component that connects the two shielding elements.

7. The silver stripping and shielding device according to claim 6, characterized in that, The connecting assembly is provided with an adjustment mechanism for adjusting the distance between the two shielding members.

8. The silver stripping and shielding device according to claim 7, characterized in that, The adjustment mechanism includes a first clamping member for connecting the shielding member. The connecting assembly includes a connecting plate and a support plate. The support plate is fixedly connected to the first clamping member and supports the connecting plate. The connecting plate has a waist-shaped hole. The first clamping member has a threaded portion. The threaded portion passes through the waist-shaped hole and is connected to a nut so that the connecting plate and the first clamping member remain fixed.

9. The silver stripping and shielding device according to claim 1, characterized in that, The shielding component has multiple through holes spaced apart.

10. A silver stripping device, characterized in that, include: Electrolytic cell; Two silver-stripping electrode plates are respectively disposed on both sides of the electrolytic cell and arranged along the length of the electrolytic cell; The silver stripping shielding device according to any one of claims 1 to 9 is located between the two silver stripping plates.

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