A device for etching the inner and outer surfaces of a metal tube

Abstract

The utility model discloses a metal pipe inner and outer surface etching device, including etching groove (1), power controller (2), cathode filament (3), conducting pipe (5), lifting system (6), cathode filament (3) with conducting pipe (5) coaxial vertical fixed in etching groove (1) bottom, and cathode filament (3) is located conducting pipe (5)'s central axis position, lifting system (6) is used for fixed metal pipe (4) and can control metal pipe (4) the depth of immersion etching liquid, when the inner surface and cathode filament (3) form inner etching cavity, the outer surface and conducting pipe (5) form outer etching cavity of metal pipe (4) drop. The device can etch the metal pipe of different sizes, and the energy consumption is low, and the mechanism is simple, and the etching efficiency is high, and the device will not produce noise pollution and dust pollution to the environment, and the inner and outer surfaces can be etched simultaneously, and the quality demand of subsequent surface treatment is reached.

Description

Technical Field

[0001] This utility model relates to the field of metal surface treatment technology, specifically to a device for simultaneous etching of the inner and outer surfaces of metal tubes based on electrochemical principles, which is particularly suitable for controllable etching of the inner and outer surfaces of metal tubes such as stainless steel tubes, titanium tubes, and copper tubes. Background Technology

[0002] Metal tubes are a common piping material, including copper, titanium, and stainless steel, and are suitable for various industrial fields. Their main purpose is to transport gases, liquids, and solids, including water, oil, gases, steam, fuels, and chemicals. For example, thin-walled titanium tubes are a core component of heat exchangers and are widely used in wastewater treatment, seawater desalination, and thermoelectric power generation. To perform subsequent surface treatments on both the inner and outer surfaces of metal tubes simultaneously, etching is required on both surfaces at the same time. Etching the outer surface of metal tubes typically involves strong chemical acids, mechanical polishing, or electrochemical electrolysis, which often results in severe etching of the tube tip and inner surface simultaneously. For internal surface modification etching, chemical immersion is usually used, but this method suffers from drawbacks such as uneven etching of the inner surface.

[0003] Therefore, there is an urgent need to develop a metal tube internal and external surface etching system that is widely applicable, simple to operate, highly efficient, environmentally friendly, and low in cost. Utility Model Content

[0004] This invention provides an etching device for the inner and outer surfaces of a metal tube, which achieves simultaneous or stepwise etching of the inner and outer surfaces through structural innovation. The specific solution is as follows: An etching device for the inner and outer surfaces of a metal tube includes an etching tank 1, a power controller 2, a cathode wire 3, a conductive tube 5, and a lifting system 6. The cathode wire 3 is coaxially and vertically fixed to the bottom of the etching groove 1 with the conductive tube 5, and the cathode wire 3 is located at the central axis of the conductive tube 5. The lifting system 6 is used to fix the metal tube 4 and can control the depth of the metal tube 4 immersed in the etching solution. When the metal tube 4 descends, the inner surface forms an inner etching cavity with the cathode wire 3, and the outer surface forms an outer etching cavity with the conductive tube 5. The power controller 2 connects the positive terminal of the power supply to the metal tube 4 and the negative terminal of the power supply to the cathode wire 3 and the conductive tube 5 respectively, thereby controlling the cathode wire 3 and the conductive tube 5 to supply power respectively.

[0005] Furthermore, the diameter of the cathode wire 3 is 0.05 mm to 2 mm, and the inner diameter of the conductive tube 5 is 5 mm to 50 mm.

[0006] Furthermore, the conductive tube 5 is made of stainless steel, titanium, or graphite, and its inner surface forms an annular etched area with the outer surface of the metal tube 4, with an annular gap width of 0.5 mm to 10 mm.

[0007] Furthermore, the lifting range of the lifting system 6 is 0.1 mm to 1000 mm.

[0008] Furthermore, the ratio of the inner diameter of the metal tube 4 to the diameter of the cathode wire 3 is 1:0.05 to 1:0.5.

[0009] Furthermore, it also includes an etching fluid pump, which is used to control the flow direction and flow rate of the etching fluid.

[0010] Furthermore, the conductive tube 5 is provided with an overflow port, and the conductive tube 5 is isolated from the bottom of the etching tank 1 by a sealing ring. The level of the etching solution is adjusted by the overflow port.

[0011] Furthermore, an insulating layer is provided between the cathode wire 3 and the conductive tube 5 to avoid current interference between the inner and outer etching modes.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This device enables efficient stepwise or simultaneous etching of both internal and external surfaces. Through a coaxial fixing design of the cathode wire and conductive tube, combined with power mode switching (mechanical or automatic control) and immersion depth adjustment of the lifting system, it achieves rapid switching between internal and external surface etching modes without disassembling the metal tube, improving process efficiency by over 40%. Etching parameters are precisely controllable. The matching design of the cathode wire diameter, conductive tube inner diameter, and metal tube inner diameter, combined with etching fluid flow rate control and annular gap width adjustment, ensures uniform etching of both internal and external surfaces. This device is environmentally friendly and low-cost, producing no noise or dust pollution. The coaxial nested structure reduces equipment size, and the lifting system and modular components (replaceable cathode wire and conductive tube) reduce maintenance costs and extend service life by more than 2 times.

[0013] It should be understood that the description in this utility model description section is not intended to limit the key or essential features of the embodiments of this utility model, nor is it intended to restrict the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0014] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the processing system of this utility model; Figure 2 This utility model is a transformation structure that performs etching on both the outer and inner surfaces separately.

[0015] Among them, 1-etching tank, 2-power controller, 3-cathode wire, 4-metal tube, 5-conductive tube, and 6-lifting system. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0017] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] Example 1

[0019] This embodiment discloses an etching apparatus for the inner and outer surfaces of a metal tube, including an etching tank 1, a power controller 2, a cathode wire 3, a metal tube 4, a conductive tube 5, a lifting system 6, and an etching solution. The specific steps for etching the inner and outer surfaces of the metal tube are as follows: (1) The original stainless steel pipe with a length of 80 mm and an inner diameter of 1 mm was ultrasonically cleaned in detergent, ethanol and deionized water in sequence, with each ultrasonic cleaning time being 30 min. (2) Purge the cleaned stainless steel pipe with nitrogen gas to evaporate the moisture on the inner and outer surfaces, and then put it into an oven for drying. The oven temperature is 60 ℃ and the drying time is 3 h. (3) Fix a stainless steel conductive tube with a diameter of Æ of 30 mm and a length of 200 mm at the center of the etching groove of the outer surface etching system to ensure that the conductive tube is perpendicular to the etching groove. (4) Fix the stainless steel cathode wire with a diameter of 0.2 mm in the center of the etching groove of the inner surface etching system, ensuring that the stainless steel cathode wire coincides with the axis of the stainless steel tube. (5) Install the stainless steel tube on the lifting system of the external surface etching system, insert the stainless steel tube into the conductive tube 30 mm deep, and pour in the etching solution (concentration of 0.1 mol·L⁻¹). -1 Fill the conductive tube with etching solution and ensure that the etching solution flows from top to bottom inside the stainless steel tube at a certain flow rate using an etching solution pump. Connect the conductive tube and the stainless steel cathode wire to the negative terminal of the power supply and connect the stainless steel tube to the positive terminal of the power supply. Turn on the power supply and set the power supply voltage to 12 V. Turn off the power supply after 30 seconds. At this time, the etching of the inner and outer surfaces of the stainless steel tube is completed. (6) Sonicate the etched stainless steel tube in deionized water for 30 min; (7) Use nitrogen to dry the inner and outer surfaces of the cleaned stainless steel pipe, and then put it into an oven for drying. The oven temperature is 60 ℃ and the drying time is 3 h. (8) The inner and outer surfaces of the stainless steel tube after etching and drying by the etching system can meet the subsequent requirements.

[0020] In this embodiment, an etching system is used to etch the inner and outer surfaces of the stainless steel tube, resulting in a micron-level rough structure on the inner and outer surfaces of the stainless steel tube within a length of 30 mm.

[0021] Example 2

[0022] The main structure and working process of this embodiment are the same as those of embodiment 1, except that: 1. In step (1), the original stainless steel tube is replaced with an original titanium tube of the same length and diameter.

[0023] 2. In step (5), the original titanium tube is inserted into the conductive tube 30 mm inside. The power supply voltage can be adjusted to about 15 V. The power supply time and power supply voltage can be adjusted according to the actual situation, so that the outer surface of the original titanium tube produces a relatively uniform rough structure.

[0024] In this embodiment, an etching system is used to etch the inner and outer surfaces of the original titanium tube, so that a relatively uniform micron structure is generated on the inner and outer surfaces of the titanium tube within a length of 30 mm.

[0025] Example 3

[0026] The main structure and working process of this embodiment are the same as those of embodiment 2, except that: 1. In step (1), the original titanium tube is replaced with an original copper tube of the same length and diameter.

[0027] 2. In step (5), the corresponding power supply voltage and power-on time can be adjusted according to the actual situation so that a relatively uniform rough structure is produced on the outer surface of the copper tube.

[0028] In this embodiment, an etching system is used to etch the inner and outer surfaces of the original copper tube, so that a relatively uniform micron structure is generated within a 30 mm length range on both the inner and outer surfaces of the copper tube.

[0029] Example 4

[0030] like Figure 2 As shown, this invention can also use a cathode wire and a conductive tube alone to achieve etching only on the inner and outer surfaces.

[0031] Internal surface etching mode: The cathode wire is vertically embedded at the bottom of the etching tank; the etching liquid in the internal surface etching system flows from top to bottom; the positive terminal of the power controller is connected to the metal tube through a wire, and the negative terminal of the power controller is connected to the cathode wire through a wire; the etching length of the inner surface of the metal tube is freely controlled by the lifting system; thus, the inner surface can be etched separately.

[0032] External surface etching mode: The conductive tube is vertically embedded at the bottom of the etching tank; the conductive tube is filled with etching fluid; the positive terminal of the power controller is connected to the metal tube through a wire, and the negative terminal of the power controller is connected to the conductive tube through a wire; the external surface etching length is freely controlled by the lifting system; this allows for etching of the external surface independently.

[0033] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An etching apparatus for the inner and outer surfaces of a metal tube, characterized in that: It includes an etching tank (1), a power controller (2), a cathode wire (3), a conductive tube (5), and a lifting system (6); The cathode wire (3) is coaxially and vertically fixed to the bottom of the etching groove (1) with the conductive tube (5), and the cathode wire (3) is located at the central axis of the conductive tube (5); The lifting system (6) is used to fix the metal tube (4) and can control the depth of the metal tube (4) immersed in the etching solution. When the metal tube (4) descends, the inner surface forms an inner etching cavity with the cathode wire (3) and the outer surface forms an outer etching cavity with the conductive tube (5). The power controller (2) connects the positive terminal of the power supply to the metal tube (4) and the negative terminal of the power supply to the cathode wire (3) and the conductive tube (5) respectively, and controls the cathode wire (3) and the conductive tube (5) to supply power respectively.

2. The etching apparatus as described in claim 1, characterized in that: The cathode wire (3) has a diameter of 0.05 mm to 2 mm, and the conductive tube (5) has an inner diameter of 5 mm to 50 mm.

3. The etching apparatus as described in claim 2, characterized in that: The conductive tube (5) is made of stainless steel, titanium or graphite, and its inner surface forms an annular etched area with the outer surface of the metal tube (4), with an annular gap width of 0.5 mm to 10 mm.

4. The etching apparatus as described in claim 3, characterized in that: The lifting range of the lifting system (6) is 0.1mm to 1000mm.

5. The etching apparatus according to claim 4, characterized in that: The ratio of the inner diameter of the metal tube (4) to the diameter of the cathode wire (3) is 1:0.05 to 1:0.

5.

6. The etching apparatus according to claim 5, characterized in that: It also includes an etching fluid pump, which is used to control the flow direction and flow rate of the etching fluid.

7. The etching apparatus according to any one of claims 1-6, characterized in that: An overflow port is provided on the conductive tube (5). The conductive tube (5) is isolated from the bottom of the etching tank (1) by a sealing ring. The level of the etching solution is adjusted by the overflow port.

8. The etching apparatus according to any one of claims 1-6, characterized in that: An insulating layer is provided between the cathode wire (3) and the conductive tube (5) to avoid current interference between the inner and outer etching modes.

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