Circulating filtration system of copper melting tank

Abstract

The utility model discloses a copper melting tank circulating filtration system which is characterized by comprising a copper melting main tank and an auxiliary tank, and a copper melting tank liquid medicine of the copper melting main tank overflows into the auxiliary tank; the circulating conveying pipeline is connected with the auxiliary tank and the copper melting main tank, the circulating pump and the filter are arranged on the circulating conveying pipeline, the filter screen is horizontally laid on a tank opening of the auxiliary tank, a plurality of supporting pieces are arranged in the auxiliary tank, and the filter screen is supported on the supporting pieces. And the filter screen is matched with the notch of the auxiliary groove in shape and size. According to the circulating filtration system of the copper melting tank, the filter screen is arranged in the auxiliary tank, and a vertical filtration mode is adopted, so that large particles in liquid medicine in the copper melting tank are effectively filtered, the filtration effect of the filter can be improved, the service life of the filter is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of printed circuit board production, in particular to a copper bath circulation filtering system. Background Art

[0002] The electroless copper plating process of PCB circuit board is to deposit a layer of metal copper on the hole wall and surface of the insulating substrate (including resin and glass fiber) by chemical catalytic reduction method to achieve the purpose of electrical interconnection between double-sided boards and multi-layer boards and solderable components. The main copper plating tank is to deposit a layer of metal copper with uniform thickness on the hole wall and copper surface of the PCB board by chemical copper plating, so that the non-metallic hole wall is metalized, laying a certain metal conductive layer for the next electroplating process, so as to achieve the purpose of connecting the inner and outer layers.

[0003] When the chemical copper plating reaction occurs in the copper bath, a side reaction will occur to generate Cu 2 O, and then copper particles and foreign matter are generated. If the impurities are not cleaned in time, they are easily adsorbed on the board surface, causing quality abnormalities. Therefore, it is necessary to purify the plating solution in the copper bath.

[0004] In the prior art, after the copper-removing tank liquid overflows into the secondary tank, it is transported to the copper-removing tank through a circulation pump, and a filter is arranged on the transport pipeline to filter the particles in the copper-removing tank liquid. Since large particles directly enter the filter, the filter element is easily clogged, which affects its filtering effect and service life, and the filter maintenance cost is high.

[0005] In view of this, it is necessary to provide a new copper bath filtration system to solve the above technical problems. Utility Model Content

[0006] The utility model aims to provide a copper-removing tank circulation filtration system, which effectively filters large particles in the copper-removing tank liquid by arranging a filter screen in the auxiliary tank and adopting a vertical filtration method, thereby improving the filtering effect of the filter, extending the service life of the filter and reducing the maintenance cost.

[0007] The technical solution of the utility model is as follows:

[0008] A copper-reducing tank circulation filtration system comprises a copper-reducing main tank and a sub-tank, wherein the copper-reducing tank chemical solution of the main tank overflows into the sub-tank; further comprising a circulation delivery pipeline connecting the sub-tank and the main tank, a circulation pump and a filter arranged on the circulation delivery pipeline, and a filter screen horizontally laid on a notch of the sub-tank, wherein a plurality of support members are arranged in the sub-tank, the filter screen is supported by the support members, and the filter screen matches the notch shape and size of the sub-tank.

[0009] Furthermore, the filter screen includes a PVC outer frame and mesh embedded in the PVC outer frame.

[0010] Furthermore, the mesh is made of acid and alkali resistant Teflon material.

[0011] Furthermore, the filter is a backwash filter.

[0012] Furthermore, the auxiliary tank and the copper-plating main tank are an integrated structure, and the auxiliary tank and the copper-plating main tank are separated by a partition, and the height of the partition is lower than the tank body height of the auxiliary tank / copper-plating main tank.

[0013] Compared with the prior art, the copper bath circulation filtration system provided by the utility model has the following beneficial effects:

[0014] 1. The copper-reducing tank circulation filtration system provided by the utility model has a filter screen arranged at the notch of the auxiliary tank. The copper-reducing tank liquid overflowing from the main copper-reducing tank is filtered by the filter screen and then flows into the auxiliary tank. The filter screen intercepts large particles in the copper-reducing tank liquid. During the circulation of the copper-reducing tank liquid in the auxiliary tank and the main copper-reducing tank, the problem of pore blockage of the filter caused by particles can be reduced, thereby improving the filtration efficiency. Therefore, the circulation system has the characteristics of high filtration accuracy, large flux and small pressure drop.

[0015] 2. The copper bath circulation filtration system provided by the utility model solves the problem of easy clogging of the filter, prolongs the service life of the filter, and reduces the maintenance cost; and the filter uses a backwash filter, which further reduces the operating cost; the mesh of the filter is made of acid and alkali resistant Teflon material and has a long service life.

[0016] 3. The copper-plating tank circulation filtration system provided by the utility model has a filter screen supported on a support member in the auxiliary tank, which is easy to disassemble and assemble, and more convenient to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a structural schematic diagram of the copper bath circulation filtration system of the utility model;

[0019] Figure 2 The utility model is a schematic diagram of the structure of the filter screen in the copper bath circulation filter system. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention and to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the specific implementation methods of the present invention are further described below.

[0021] It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as there is no conflict between them.

[0022] See also Figure 1 , is a schematic diagram of the structure of the copper-reducing tank circulation filtration system of the utility model. The copper-reducing tank circulation filtration system of the utility model comprises a copper-reducing main tank 1, a sub-tank 2, a circulation delivery pipeline 3 connecting the sub-tank 2 and the copper-reducing main tank 1, a circulation pump 4 and a filter 5 arranged in the circulation delivery pipeline 3, and a filter screen 6 horizontally laid in the notch of the sub-tank 2.

[0023] The copper-making tank liquid in the copper-making main tank 1 overflows into the auxiliary tank 2, and the overflow pipe can be used to overflow into the auxiliary tank. In this embodiment, the copper-making main tank 1 and the auxiliary tank 2 are an integrated structure, and the auxiliary tank 2 is separated from the copper-making main tank 1 by a partition 7, and the height of the partition 7 is lower than the tank body height of the auxiliary tank / copper-making main tank. The copper-making tank liquid in the copper-making main tank 1 overflows into the auxiliary tank 2 through the partition 7, and this structural design has the advantage of a compact structure.

[0024] The filter screen 6 matches the shape and size of the slot of the auxiliary tank 2, that is, the filter screen is laid at the slot of the auxiliary tank 2 in the horizontal direction. When the copper-making tank liquid in the copper-making main tank 1 overflows to the auxiliary tank 2, the particles in the copper-making tank liquid are directly intercepted by the filter screen, and the liquid enters the auxiliary tank 2 through the filter holes of the filter screen, realizing vertical filtration, and the impurities intercepted on the filter screen are easy to clean. In this embodiment, the inner wall of the auxiliary tank 2 is provided with a plurality of support members 8 for supporting the filter screen 6. The position of the support member 8 is a certain distance lower than the top of the partition 7, such as 5-15 cm lower than the top of the partition 7.

[0025] Since the filter screen is supported on the support member 8 and the size of the filter screen and the slot of the auxiliary tank 2 are similar, the filter screen always maintains a stable state without deviation under the impact of the overflow of the copper tank liquid. When the filter screen needs to be cleaned, it is convenient to take it out.

[0026] In the present invention, the filter screen 6 comprises a PVC outer frame 61 and a mesh 62 embedded in the PVC outer frame. The mesh 62 is made of acid- and alkali-resistant Teflon material and is used for filtering the chemical solution in the copper tank. It has the advantage of a long service life.

[0027] In the utility model, since the filter screen filters the large particles in the copper-melting tank liquid, the content of particles in the copper-melting tank liquid entering the filter is significantly reduced, thereby solving the problem of easy clogging of the filter, extending the service life of the filter, and reducing the maintenance cost of the filter; preferably, the filter 5 is a backwash filter, which can reduce the frequency of replacing the filter element and further reduce the operating cost.

[0028] The copper plating tank circulation system of the utility model improves the filtering efficiency of the filter and has the characteristics of high filtering accuracy, large flux and small pressure drop, and can meet the production and quality requirements of PCB copper plating.

[0029] The above is a detailed description of the embodiments of the present invention, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations made to these embodiments without departing from the principle and spirit of the present invention still fall within the scope of protection of the present invention.

Claims

1. A copper bath circulation filtration system, characterized in that: The invention comprises a main copper-plating tank and a sub-tank, wherein the copper-plating tank liquid in the main copper-plating tank overflows into the sub-tank; the invention also comprises a circulation conveying pipeline connecting the sub-tank and the main copper-plating tank, a circulation pump and a filter arranged on the circulation conveying pipeline, and a filter screen horizontally laid on the slot of the sub-tank, wherein a plurality of supporting members are arranged in the sub-tank, the filter screen is supported by the supporting members, and the filter screen matches the slot of the sub-tank in shape and size.

2. The copper bath circulation filtration system according to claim 1, characterized in that: The filter screen comprises a PVC outer frame and mesh embedded in the PVC outer frame.

3. The copper-removing tank circulation filtration system according to claim 2 is characterized in that: The mesh is made of acid and alkali resistant Teflon material.

4. The copper-removing tank circulation filtration system according to claim 1, characterized in that: The filter is a backwash filter.

5. The copper bath circulation filtration system according to claim 1, characterized in that: The auxiliary tank and the copper-plating main tank are of an integrated structure, and the auxiliary tank and the copper-plating main tank are separated by a partition plate, and the height of the partition plate is lower than the tank body height of the auxiliary tank / copper-plating main tank.

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