Edge frame type electrode clamp

Abstract

The utility model provides an edge frame type electrode clamp which comprises an insulating back plate / back frame, an insulating bolt, a conductive clamping frame and an insulating nut, a plurality of first through holes are formed in the edge of the insulating back plate in the circumferential direction, an electrolyte contact window is formed in the middle of the conductive clamping frame, and a tab is arranged on the edge of the upper end of the conductive clamping frame. Second through holes in one-to-one correspondence with the first through holes are formed in the conductive clamping frame in the circumferential direction, the electrode is arranged between the insulating back plate / back frame and the conductive clamping frame, the insulating bolts penetrate through the ends in the first through holes and the second through holes and are locked through the insulating nuts, and the electrode is clamped between the insulating back plate / back frame and the conductive clamping frame. And the electrode spraying catalyst side or the to-be-plated surface of the base material faces the electrolyte contact window. The conductive clamping frame and the electrode of the clamp are in edge integral surface contact, so that the conductive area is increased, the conductive mode is changed from traditional local conductive to boundary integral conductive, the conductive uniformity is greatly enhanced in large-area hydrogen production electrode detection and electroplating working conditions, and the current efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of electroplating fixtures or electrode testing fixtures, and in particular to an edge frame type electrode fixture. Background Technology

[0002] Currently, in electroplating or electrolysis processes, electrodes are connected to the power supply using butterfly clamps or localized conductivity detection electrode clamps. These clamps and electrodes employ a localized fixation method, holding the electrode at a specific point. When the electrode has a large mass or area, this localized fixation method cannot guarantee electrode stability. Furthermore, due to the large mass or area of ​​the electrode, the current flowing through it is relatively large. Because the discharge activity at the current's edge is high, localized contact often leads to excessively large edge currents and uneven current distribution. This results in two problems: firstly, severe heat generation; and secondly, in the electroplating or electrolysis industry, uneven conductivity often occurs in the electrode edge region (high-activity site region), where the plating layer is often very thick.

[0003] In addition, in the field of hydrogen production electrode testing, large industrial hydrogen production electrodes of 2.6 square meters are often used. However, in the national standard GB / T 45092-2024, only a small area of ​​the above electrodes is selected for testing, which cannot explain the overall electrode performance. If the whole tank is tested, each test will require a lot of manpower, material resources and financial resources, and disassembly will take a long time.

[0004] In view of this, it is necessary to improve the existing electrode clamps to solve the above problems. Utility Model Content

[0005] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides an edge frame type electrode clamp.

[0006] The technical solution adopted by this utility model to solve its technical problem is: an edge frame type electrode clamp, including an insulating back plate, insulating bolts, a conductive clamping frame, and insulating nuts. The edge of the insulating back plate is provided with a plurality of first through holes along the circumferential direction. The conductive clamping frame includes a first electrolyte contact window in the middle and an electrode lug integrally formed with the conductive clamping frame at the upper edge. The electrode lug is used to connect to a power source. The conductive clamping frame is provided with second through holes corresponding one-to-one with the first through holes along the circumferential direction. The electrode is placed between the insulating back plate and the conductive clamping frame. The insulating bolt passes through the first and second through holes and is locked at the end by the insulating nut, clamping the electrode between the insulating back plate and the conductive clamping frame, so that the conductive clamping frame is in contact with the entire surface of the electrode edge. In hydrogen production electrode detection, the side of the electrode coated with catalyst faces the first electrolyte contact window, or in industrial electroplating, the pre-plating surface of the electrode substrate faces the first electrolyte contact window.

[0007] The electrodes involved in this invention can be made of mesh, felt, or foamed metal (foamed nickel, foamed titanium, etc.). In use, this fixture increases the conductive area between the conductive clamp and the electrode through edge-to-edge contact, thus increasing the number of contact points. Combined with the performance of the electrode material, this significantly enhances the uniformity of electroplating or electrolysis.

[0008] Furthermore, the conductive clamping frame is coated with an insulating coating on all surfaces except the side facing the insulating back plate and the outer surface of the electrode tab. That is, the side facing the insulating back plate and the surface of the electrode tab are not coated with an insulating coating.

[0009] The conductive clamp is made of metal and has good conductivity. The outer surface that does not contact the electrode is coated with an insulating coating. In addition, it allows the current to flow only through the electrode area without loss. The current is completely guided to the electrode that is in contact with the inner side. At this time, the conductive clamp is similar to a wire, but the cross-sectional area of ​​the wire is the entire area in contact with the electrode, which can effectively reduce consumption and heat generation.

[0010] The conductive frame and insulating backplate sandwich the electrode in the middle. Due to the thickness of the electrode, there will be a certain gap between the edges of the conductive frame and the insulating backplate. Although the electrolyte will flow into the gap, it cannot flow further into the interior due to the wire diameter of the nickel mesh electrode (which is usually used as an electrode in hydrogen electrolysis cells). Although felt and foam metal materials will flow in, the water absorption rate at the edges is negligible and will not affect the use of the electrode.

[0011] Meanwhile, the hydrogen production electrode is coated with catalyst on one side only, so as long as there is no strong convection of the solution, the internal or back electrode will not affect the test area. In addition, the current that the catalyst of the electrode can carry will account for the majority of the test in the actual test, and all test electrodes are guaranteed to have the same wire diameter and mesh size. The influence of the internal part (the part without catalyst) and the part in contact with the solution can be regarded as the same.

[0012] Different insulating coatings are required to be used in different operating environments. The coatings are required to be non-dissolving (chemical reaction) and non-detaching (physical reaction). Generally, it is preferred that the insulating coating is made of Teflon coating.

[0013] Preferably, the conductive clamping frame is made of titanium or nickel.

[0014] Furthermore, the insulating bolt is provided with an insulating washer, which is placed between the insulating backing plate and the insulating bolt. Preferably, the insulating washer is made of polytetrafluoroethylene (PTFE).

[0015] Preferably, the outer edge length of the conductive clamping frame is smaller than the outer edge length of the insulating back plate.

[0016] Preferably, the insulating backing plate is made of PP plastic, PVC or polytetrafluoroethylene, and the insulating bolts are made of the same material as the insulating backing plate.

[0017] Furthermore, when the electrode needs to be used on both sides, a second electrolyte contact window is provided in the middle of the insulating back plate to form an insulating back frame, and the first through hole is opened on the insulating back frame in the circumferential direction.

[0018] Preferably, the second electrolyte contact window is a hollow single-cell or multi-cell window structure, or the second electrolyte contact window is a grid structure.

[0019] In this invention, all components are made of materials known in the art. It is an application of known materials and does not involve any improvement to the materials themselves.

[0020] The beneficial effects of this utility model are: the edge frame type electrode clamp provided by this utility model increases the conductive area between the conductive clamp frame and the electrode through the overall contact of the edge surface, and the conductive mode changes from the original local conductivity to the overall boundary conductivity, which greatly enhances the uniformity of electroplating or electrolysis. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a three-dimensional structural diagram of the edge frame electrode clamp of this utility model (only one nut is shown).

[0023] Figure 2 This is an exploded structural diagram of the edge frame electrode clamp of this utility model.

[0024] Figure 3 This is a side view of the edge frame electrode clamp of this utility model.

[0025] Figure 4 This is a schematic diagram of an edge-frame electrode clamp using an insulated back frame.

[0026] In the figure: 1. Insulating back plate, 1.1. First through hole, 2. Insulating bolt, 3. Electrode, 4. Conductive clamp frame, 4.1. Second through hole, 4.2. Electrode lug, 4.3. First electrolyte contact window, 5. Insulating nut, 6. Insulating washer, 7. Insulating back frame, 7.1. Second electrolyte contact window. Detailed Implementation

[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0030] The electrode in this embodiment of the invention may specifically refer to a hydrogen production electrode. The electrode clamp is mainly used for the detection of hydrogen production electrodes, and is also applicable in the electroplating field.

[0031] Example 1:

[0032] like Figures 1-3As shown, this utility model discloses an edge-frame type electrode clamp, comprising an insulating back plate 1, insulating bolts 2, a conductive clamping frame 4, and insulating nuts 5. The insulating back plate 1 has multiple first through holes 1.1 along its circumferential edge. The conductive clamping frame 4 has a first electrolyte contact window 4.3 in its center and an integrally formed electrode lug 4.2 on its upper edge for connecting to a power source. The upper circumferential edge also has second through holes 4.1 corresponding to the first through holes 1.1. An electrode 3 is disposed between the insulating back plate 1 and the conductive clamping frame 4. The insulating bolts 2 pass through the first and second through holes 1.1 and are locked at their ends by the insulating nuts 5, clamping the electrode 3 between the insulating back plate 1 and the conductive clamping frame 4. In hydrogen production electrode detection, the side of the electrode coated with catalyst faces the first electrolyte contact window 4.3; or in industrial electroplating, the pre-plated surface of the electrode's electroplating substrate faces the first electrolyte contact window 4.3. Preferably, the outer edge length of the conductive clamping frame 4 is smaller than the outer edge length of the insulating back plate 1. An insulating washer 6 is provided on the insulating bolt 2, and the insulating washer 6 is placed between the insulating back plate 1 and the insulating bolt 2. Preferably, the insulating washer 6 is made of polytetrafluoroethylene (PTFE). Preferably, the conductive clamp 4 is made of titanium or nickel. Different materials of the conductive clamp 4 can be selected according to the usage environment. Titanium is used in acidic environments. In acidic environments, if the conductive clamp 4 is the anode, its surface will passivate during continuous use. The passivation layer becomes insulating, and the part in contact with the electrode 3 will preferentially transmit current to the electrode 3. At this time, the conductivity of the conductive clamp 4 will improve with use. In alkaline environments, titanium will dissolve, so nickel is preferred. Preferably, the insulating back plate 1 is made of PP plastic, PVC, or PTFE, and the insulating bolt 2 is made of the same material as the insulating back plate 1. The material selection of the insulating back plate 1 is determined according to the specific usage environment. The conductive clamp 4 is coated with an insulating coating on all surfaces except the side facing the insulating back plate 1 and the outer surface of the tab 4.2. That is, the side facing the insulating backplate 1 and the surface of the tab 4.2 are not coated with an insulating coating. Preferably, the insulating coating is made of Teflon paint.

[0033] For the insulating coating on the conductive clamp 4, the coating area should cover all surfaces in contact with the electrolyte, except for the contact surface with the insulating backplate 1 and the tabs 4.2. After coating, a high-current or high-voltage insulation test should be performed. Two identical conductive clamps 4 are used as two electrodes, and the insulating backplate 1 is installed on the back to shield the conductive area of ​​the conductive clamp 4. The two assembled conductive clamps 4 and the insulating backplate 1 are placed in a high-concentration alkaline or acidic solution (depending on the conductive clamp material) as the anode and cathode, respectively. If the DC power supply shows insulation (current is zero and voltage is not zero), the coating is completely applied. If a current reading is observed, it indicates that the coating is not completely insulating, and the higher the current, the worse the insulation. At the same time, a strong flashlight is used to illuminate the surface of the electrode clamp; areas where bubbles are continuously generated are areas with poor coating. The thickness of the conductive clamp 4 depends on the specific working environment and electrode thickness.

[0034] The structure in this embodiment is suitable for situations where the electrode is used on only one side.

[0035] Example 2:

[0036] like Figure 4 As shown, the difference between this embodiment and Embodiment 1 lies in the structure of the insulating back plate 1. In this embodiment, a second electrolyte contact window 7.1 is formed in the middle of the insulating back plate 1 to create an insulating back frame 7. The first through hole 1.1 is arranged circumferentially on the insulating back frame 7 and corresponds one-to-one with the second through hole 4.1 on the conductive clamping frame 4. The edge frame electrode clamp of this embodiment is used in situations where electrodes need to be used on both sides. Preferably, the width of the edge frame 7 should be reserved with sufficient length to facilitate the opening of the first through hole 1.1. The second electrolyte contact window 7.1 is a hollow single or multi-cell window structure (for example, it can be a rectangular single frame, a rectangular four-frame, a star-shaped frame, etc.), or the second electrolyte contact window 7.1 is a grid structure. The size of the insulating back frame 7 can be selected to ensure its shape and rigidity. When the insulating back frame 7 adopts a grid structure, the overall clamp can be made larger for electrodes of flexible felt or foam materials with a larger area. At the same time, the conductive clamping frame needs to be changed to a conductive clamping grid frame to facilitate the comprehensive detection process of the electrodes.

[0037] Usage process:

[0038] 1. First, place the insulating back plate 1 vertically, and insert the insulating bolt 2 and the insulating washer 6 into the first through hole 1.1 on the back side of the insulating back plate 1. First, use the insulating nut 5 to pre-fix the insulating bolt 2. Note that the insulating nut 5 should not be tightened too much. Just make sure that the insulating bolt 2 does not fall out during the process of laying the insulating back plate 1 flat. If the insulating back plate 1 without holes is used (that is, the insulating stud is used instead of the insulating bolt 2 and directly welded to the insulating back plate 1), this step can be ignored.

[0039] 2. Remove the insulating nut 5 and insert the electrode.

[0040] 3. Place the conductive clamping frame 4 on top, tighten the insulating nut 5, and the assembly is complete. It can be placed in the electrolytic cell for fixation and then put into use.

[0041] When the electrode tab 4.2 is connected to the power supply and the conductive clamp 4 is energized, the entire perimeter of the electrode is in contact with the power source, increasing the conductive area and greatly enhancing the uniformity of electroplating or electrolysis. If the electrode is used on both sides, the insulating back frame 7 can be used instead of the insulating back plate 1; the other operating procedures remain the same.

[0042] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An edge-frame type electrode clamp, characterized in that: The electrode comprises an insulating backplate, insulating bolts, a conductive clamping frame, and insulating nuts. The insulating backplate has multiple first through holes along its circumferential edge. The conductive clamping frame has a first electrolyte contact window in its middle. The upper edge of the conductive clamping frame has an electrode tab integrally formed with the conductive clamping frame. The electrode tab is used to connect to a power source. The conductive clamping frame has second through holes along its circumferential edge that correspond one-to-one with the first through holes. The electrode is disposed between the insulating backplate and the conductive clamping frame. The insulating bolts pass through the first and second through holes and are locked at their ends by the insulating nuts, clamping the electrode between the insulating backplate and the conductive clamping frame. In hydrogen production electrode detection, the side of the electrode coated with catalyst faces the first electrolyte contact window, or in industrial electroplating, the pre-plated surface of the electrode substrate faces the first electrolyte contact window.

2. The edge frame electrode clamp as described in claim 1, characterized in that: The conductive clamping frame is coated with an insulating coating on all surfaces except the side facing the insulating back plate and the outer surface of the electrode tab.

3. The edge frame electrode clamp as described in claim 2, characterized in that: The insulating coating is made of Teflon paint.

4. The edge frame electrode clamp as described in claim 1, characterized in that: The conductive clamping frame is made of titanium or nickel.

5. The edge frame electrode clamp as described in claim 1, characterized in that: An insulating washer is provided on the insulating bolt, and the insulating washer is placed between the insulating back plate and the insulating bolt.

6. The edge frame electrode clamp as described in claim 1, characterized in that: The outer edge length of the conductive clamping frame is smaller than the outer edge length of the insulating back plate.

7. The edge frame electrode clamp as described in claim 1, characterized in that: The insulating backplate is made of PP plastic, PVC or polytetrafluoroethylene, and the insulating bolts and insulating nuts are made of the same material as the insulating backplate.

8. The edge frame electrode clamp as described in any one of claims 1-7, characterized in that: The insulating back plate has a second electrolyte contact window in the middle to form an insulating back frame, and the first through hole is formed on the insulating back frame in the circumferential direction.

9. The edge frame electrode clamp as described in claim 8, characterized in that: The second electrolyte contact window is a hollow single-cell or multi-cell window structure, or the second electrolyte contact window is a grid structure.

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