Overflow trough for assisting in preparing liquid-absorbing core and method for preparing liquid-absorbing core

Abstract

The present invention discloses an overflow trough and a method for preparing a liquid-absorbing core for assisting in the preparation of a liquid-absorbing core, and belongs to the technical field of liquid-absorbing core preparation, wherein the overflow trough comprises a second tank body, a liquid inlet pipe and a frame body; the liquid inlet pipe is connected to the second tank body and the outside of the overflow trough, and the two non-adjacent surfaces in the frame body and the two non-adjacent surfaces in the second tank body are sealed and connected, and a gap is left between the other two surfaces in the frame body and the other two surfaces in the second tank body, and the gap is used to accommodate the workpiece to be processed when assisting in the preparation of the liquid-absorbing core, and an overflow port is provided on the frame body; in the preparation process, the preparation of a large-format and groove structure can be achieved through the coupling of the high-speed motion of the laser galvanometer and the motion of the workpiece, and the coupling of the continuous processing of the liquid and the air, and the groove size is easy to adjust. The present invention, through the design of the overflow trough, makes the preparation process one-step, realizes the high surface quality, high flexibility and efficient processing of the primary groove structure with a large aspect ratio on the ultra-thin metal surface, and improves the processing efficiency of the multi-stage groove structure.

Description

Technical Field

[0001] The invention relates to an overflow trough for assisting in preparing a liquid absorbent core and a method for preparing the liquid absorbent core, belonging to the technical field of liquid absorbent core preparation. Background Art

[0002] As a highly efficient passive heat transfer element, ultra-thin heat pipes rely on the phase change of the working medium liquid inside to transfer the heat of the heat source to the heat sink or the external environment in the axial direction with a small temperature difference and quickly, thereby quickly reducing the heat accumulated on the heat source and lowering the temperature of the heat source. Its thickness is usually less than 2 mm. Among them, the wick is a key component that affects the heat transfer capacity of the heat pipe. When the heat pipe is running, the wick needs to transport the working fluid from the condensation section to the evaporation end to moisten the wick flow channel and the evaporation end to prevent damage to the inside of the heat pipe due to drying. Currently, the commonly used wicks are mainly sintered wicks, grooved wicks and composite structure wicks. The sintered wicks are mostly porous, with small pores and large capillary force, but low air permeability, and large thermal resistance between the wick and the wall. The grooved core exhibits the opposite characteristics, with high permeability but small capillary force. The composite structure core can achieve high capillary force and high permeability at the same time, but the preparation process is cumbersome, time-consuming and costly.

[0003] At present, in order to solve the capillary performance problem of the wick, researchers mainly use surface modification technology to regulate the surface properties of the wick material, thereby improving its capillary force and surface wettability. Among them, microstructure modification, chemical etching and laser processing technology are the most common. However, since the capillary performance of the wick is affected by the complex microstructure of its surface geometry and surface chemistry, although these methods improve the capillary performance to a certain extent, they all have certain limitations. The microstructure modification of laser processing makes the preparation of high-performance wicks simple, fast, economical and environmentally friendly. The existing technology mainly has the following defects:

[0004] It is difficult to achieve high surface quality, high flexibility and efficient processing of primary groove structures with large aspect ratios on ultra-thin metal surfaces, and the processing procedures of multi-level groove structures are cumbersome and inefficient. Summary of the invention

[0005] The object of the present invention is to provide an overflow trough and a method for preparing a liquid-absorbing core for assisting in the preparation of a liquid-absorbing core, so as to achieve high surface quality, high flexibility and efficient processing of a primary groove structure with a large aspect ratio on an ultra-thin metal surface, and to improve the processing efficiency of a multi-level groove structure.

[0006] To achieve the above objectives, the present invention is implemented by adopting the following technical solutions:

[0007] In the first aspect, the present invention provides an overflow trough for assisting in the preparation of a liquid-absorbing core, comprising a second trough body, a liquid inlet pipe and a frame body; the liquid inlet pipe connects the second trough body and the outside of the overflow trough, the frame body and the second trough body are quadrilaterals of the same shape in a top-down view, two non-adjacent surfaces in the frame body and two non-adjacent surfaces in the second trough body are sealedly connected, a gap is left between the other two surfaces in the frame body and the other two surfaces in the second trough body, the gap is used to accommodate a workpiece to be processed when assisting in the preparation of the liquid-absorbing core, the height of the gap is greater than the thickness of the workpiece, and the height of the gap is also less than the maximum height at which liquid will not flow out of the gap under the premise of accommodating the workpiece, an overflow port is provided on the frame body, and when the workpiece is accommodated in the gap and liquid is passed into the liquid inlet pipe, the upper surface of the workpiece is covered with a liquid film.

[0008] Furthermore, it also includes a first connecting portion and a second connecting portion;

[0009] When assisting in the preparation of the absorbent core, the moving direction of the workpiece to be processed is the X direction, the direction perpendicular to the moving direction on the plane where the workpiece is located is the Y direction, the frame body and the second trough body are both rectangular, there are two second connecting parts and they are respectively arranged on the tops of the two sides of the second trough body in the Y direction, there are two first connecting parts and they are respectively arranged on the bottoms of the two sides of the frame body in the Y direction, the first connecting parts are sealed and connected with the corresponding second connecting parts, the gaps are located between the two sides of the frame body in the X direction and the two sides of the corresponding second trough body in the X direction, and there are two gaps in total;

[0010] The first connecting portion is a convex portion, the second connecting portion is a concave portion, and the convex structure in the convex portion matches the concave structure in the concave portion.

[0011] Furthermore, it also includes a first tank body and a liquid outlet pipe;

[0012] The second tank body is located in the first tank body and is higher than the first tank body, and the liquid outlet pipe is connected with the first tank body and the outside of the overflow tank.

[0013] Furthermore, the overflow port is arranged on the surface of the frame where the next gap in the X direction is located.

[0014] Furthermore, the width of the overflow port is the distance between two inner walls of the frame in the Y direction.

[0015] Furthermore, the liquid inlet pipe also passes through the groove wall of the first groove body.

[0016] Furthermore, the maximum height at which the liquid does not flow out of the gap under the premise of accommodating the workpiece is 0.5 mm.

[0017] In a second aspect, the present invention provides a method for preparing a liquid-absorbing core based on the overflow trough described in any one of the first aspects, comprising:

[0018] Pull the workpiece out of the unwinding mechanism, then pass the workpiece through the two gaps along the X direction, and then fix one end of the workpiece to the reeling mechanism;

[0019] Connect the liquid inlet pipe to the liquid pump and inject liquid into the overflow tank to ensure that the liquid film covers the upper surface of the workpiece;

[0020] The winding mechanism is opened to drive the workpiece to move in the X direction, and the laser is turned on at the same time, and a primary groove structure is processed on the workpiece under the liquid film by the laser, and a secondary groove structure is processed on the workpiece under the liquid film by the laser;

[0021] When the part to be processed of the workpiece comes out of the liquid film, a secondary micro-groove structure is processed by laser in the air to obtain a liquid-absorbing core with a multi-level groove structure.

[0022] Furthermore, before the winding mechanism and the laser are turned on, a cathode is arranged at the edge of a preset laser beam motion trajectory, the workpiece is used as an anode, the anode is connected to the negative electrode of the pulse power supply, and the cathode is connected to the positive electrode of the pulse power supply;

[0023] At this time, the liquid is a neutral electrolyte.

[0024] Furthermore, the neutral electrolyte includes sodium nitrate solution.

[0025] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0026] The present invention provides an overflow trough for assisting in the preparation of a liquid absorbent core and a method for preparing the liquid absorbent core. By designing the structure of the overflow trough, the upper surface of the workpiece is covered with a liquid film when the workpiece passes through a gap. With the assistance of the overflow trough, liquid-assisted preparation of the liquid absorbent core can be achieved. The liquid absorbent core prepared by liquid-assisted laser has higher capillary force, pattern resolution, and processing surface flatness than the sample prepared by laser modification in the air. This is because when laser processing is performed in the air, the molten metal generated is difficult to be discharged in time, and a large amount of recast layers are often formed during the processing. In addition, due to the generation of plasma, the laser energy is partially absorbed and shielded, resulting in low energy transfer efficiency, poor surface treatment effect, and often uneven grooves. Edges and irregular surface morphology; liquid-assisted laser processing significantly improves these shortcomings through the effect of liquid film; the liquid film can effectively inhibit the formation of plasma, reduce its shielding effect on laser energy, so that more laser energy can be efficiently transferred to the metal surface, improving the processing accuracy; in addition, the evaporation and shock wave effect of the liquid promote the rapid removal of molten metal, avoid the formation of recast layer, and improve the surface flatness; the liquid also plays a cooling role, effectively controls the local temperature, prevents overheating and diffusion, and further avoids thermal deformation and surface unevenness; the liquid can also take away the waste in the processing process, reduce metal splashing, and make the grooves and patterns more regular and smooth;

[0027] Through the structural design of the overflow trough, liquid-assisted laser processing is realized. Combined with laser processing in the air, one-step liquid-combined-air laser processing is implemented to prepare the absorbent core. No secondary processing is required, which greatly improves the processing efficiency. Compared with other technologies, it is very flexible when processing micro-groove structures with different aspect ratios or different patterns. It only needs to change the laser processing parameters. For example, there is no need to process additional mask plates like photolithography technology. The ultra-high scanning speed of the laser galvanometer combined with multiple laser scanning patterns can realize the simultaneous preparation of multiple absorbent cores, greatly improving the preparation efficiency of the absorbent core. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a cross-sectional schematic diagram of a first tank body provided by an embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of a frame provided by an embodiment of the present invention;

[0030] Figure 3 is a schematic diagram of an overflow trough when accommodating a workpiece provided by an embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of an overflow tank without a frame provided in an embodiment of the present invention;

[0032] Figure 5 is a flow chart of a method for preparing a liquid absorbent core provided in an embodiment of the present invention;

[0033] Figure 6 is an overall schematic diagram of a process for preparing a liquid absorbent core provided in an embodiment of the present invention;

[0034] Figure 7 is a flow chart of preparing a liquid-absorbing core with a multi-level groove structure by using a metal sheet provided by an embodiment of the present invention;

[0035] Figure 8 The embodiment of the present invention provides Figure 7 Schematic diagram of a multi-level groove structure prepared by the method shown;

[0036] Fig. 9 The embodiment of the present invention provides Figure 7 The method shown is a schematic diagram of the laser parameter design;

[0037] Fig.10 is a detailed schematic diagram of a workpiece processed by laser with liquid assistance provided by an embodiment of the present invention;

[0038] Fig.11 This is a schematic diagram of the principle of overlapping multiple laser spots for processing a multi-level groove structure in one step according to an embodiment of the present invention;

[0039] Fig.12 Schematic diagram of an overflow tank when an electrolyte-assisted liquid-absorbing core is prepared according to an embodiment of the present invention;

[0040] Fig.13 It is a cross-sectional schematic diagram of an overflow tank when an electrolyte-assisted liquid-absorbing core is prepared according to an embodiment of the present invention.

[0041] In the figure: 1. frame; 1-1. first connecting part; 1-2. overflow surface; 1-3. non-overflow surface; 1-4. liquid flow direction; 2. workpiece; 2-1. second connecting part; 2-2. liquid inlet pipe; 2-3. overflow chamber; 2-4. reflux chamber; 2-5. liquid outlet pipe; 3. first trough; 6. liquid; 7. gap; 8. liquid film thickness; 9. wire electrode; 10. pulse power supply. DETAILED DESCRIPTION

[0042] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the protection scope of the present invention.

[0043] Example 1.

[0044] The present invention provides an overflow tank for assisting in preparing a liquid-absorbing core, comprising a first tank body, a second tank body, a liquid inlet pipe, a liquid outlet pipe and a frame body;

[0045] The second tank body is located in the first tank body and is higher than the first tank body, the liquid inlet pipe is connected with the second tank body and the outside of the overflow tank, and the liquid outlet pipe is connected with the first tank body and the outside of the overflow tank;

[0046] The frame body and the second trough body are quadrilaterals of the same shape in a top view, two non-adjacent surfaces in the frame body and two non-adjacent surfaces in the second trough body are sealed and connected, a gap is left between the other two surfaces in the frame body and the other two surfaces in the second trough body, the gap is used to accommodate a workpiece to be processed when assisting in the preparation of a liquid absorbent core, the height of the gap is greater than the thickness of the workpiece, and the height of the gap is also less than the maximum height under the premise of accommodating the workpiece so that liquid will not flow out of the gap, an overflow port is provided on the frame body, and when the workpiece is accommodated in the gap and liquid is passed into the liquid inlet pipe, the upper surface of the workpiece is covered with a liquid film.

[0047] The present invention uses the structural design of the overflow groove to ensure that the upper surface of the workpiece is covered with a liquid film when it passes through the gap. With the assistance of the overflow groove, liquid-assisted preparation of the liquid-absorbing core can be achieved. The liquid-absorbing core prepared by liquid-assisted laser has higher capillary force, pattern resolution, and processing surface flatness than the sample prepared by laser modification in the air. This is because when laser processing is performed in the air, the molten metal generated is difficult to be discharged in time, and a large amount of recast layer is often formed during the processing. In addition, due to the generation of plasma, the laser energy is partially absorbed and shielded, resulting in low energy transfer efficiency, poor surface treatment effect, and often uneven groove edges and irregular surface morphology. Volume-assisted laser processing significantly improves these shortcomings through the action of liquid film; the liquid film can effectively inhibit the formation of plasma, reduce its shielding effect on laser energy, and enable more laser energy to be efficiently transferred to the metal surface, thereby improving processing accuracy; in addition, the evaporation and shock wave effects of the liquid promote the rapid removal of molten metal, avoid the formation of a recast layer, and improve surface flatness; the liquid also plays a cooling role, effectively controlling the local temperature, preventing overheating and diffusion, and further avoiding thermal deformation and surface unevenness; the liquid can also take away waste during processing, reducing metal splashing, and making grooves and patterns more regular and smooth.

[0048] Example 2.

[0049] like Figures 1 to 4 As shown, the present invention provides an overflow trough for assisting in preparing a liquid-absorbing core, comprising a first trough body 3, a second trough body, a liquid inlet pipe 2-2, a liquid outlet pipe 2-5, a frame body 1, a first connecting portion 1-1 and a second connecting portion 2-1.

[0050] like Figure 1 and Figure 3 As shown, the second slot body is located in the first slot body 3, and the height of the second slot body is higher than that of the first slot body 3, so that the workpiece 2 can pass through the gap 7 without bending. The movement direction of the workpiece 2 is the X direction, and the Y direction is located on the plane where the workpiece 2 is located. The Y direction is a direction perpendicular to the X direction. In this embodiment, the Y direction is as shown in FIG. Figure 3 shown.

[0051] like Figure 1 and Figure 3 As shown, two non-adjacent surfaces in the frame 1 (in this embodiment, two non-overflow surfaces 1-3 in the Y direction) and two non-adjacent surfaces in the second trough are sealed and connected, and a gap 7 is left between the other two surfaces in the frame 1 and the other two surfaces in the second trough. The gap 7 is used to accommodate a workpiece 2 to be processed when assisting in the preparation of the absorbent core. The height of the gap 7 is greater than the thickness of the workpiece 2, and the height of the gap 7 is also less than the maximum height under the premise of accommodating the workpiece so that the liquid will not flow out of the gap 7. In this embodiment, the maximum height is 0.5 mm.

[0052] like Figure 2 As shown, the frame 1 has four surfaces, one of which is lower than the other three surfaces, the lower surface is the overflow surface 1-2, and the other three surfaces are non-overflow surfaces 1-3. In this embodiment, Figure 1 As shown, the liquid 6 flows out from the overflow surface 1-2, and the liquid flow direction is Figure 2 As shown by the arrows in 1-4; two first connecting parts 1-1 are provided at the bottom of the two overflow surfaces 1-3 in the Y direction, and the first connecting parts 1-1 are protruding parts.

[0053] like Figure 4 As shown, two second connecting parts 2-1 are provided at the top of the two surfaces of the second trough body in the Y direction, and the second connecting part 2-1 is a recessed part. The convex structure in the above-mentioned convex part and the recessed structure in the recessed part cooperate to realize a sealed connection; the interior of the second trough body is an overflow chamber 2-3, and the part between the second trough body and the first trough body is a reflux chamber 2-4. The liquid inlet pipe 2-2 connects the liquid storage tank and the second trough body, and the liquid outlet pipe 2-5 connects the first trough body 3 and the liquid storage tank. The submersible pump connects the liquid storage tank and the liquid inlet pipe 2-2. When liquid 6 needs to be provided, the submersible pump draws water from the liquid storage tank and injects it into the overflow chamber 2-3. As the amount of liquid 6 flowing in increases, due to the very small height of the gap 7, it eventually overflows from the top and immerses the workpiece 2 (the workpiece 2 located in the overflow chamber 2-3 area), forming a liquid film. The thickness of the liquid film 8 is shown in FIG. Figure 1 As shown, the liquid film thickness 8 can be controlled by adjusting the height of the overflow surface 1-2. In this embodiment, the position above the overflow surface 1-2 is the overflow port, but this patent is not limited to Figure 2 The overflow design shown can also design the overflow port in the overflow surface 1-2, that is, dig an overflow port at the overflow surface 1-2, which can also achieve overflow and limit the overflow direction.

[0054] If the purpose is only to achieve that the workpiece 2 is accommodated in the gap 7 and the upper surface of the workpiece 2 is covered with a liquid film when liquid 6 is passed into the liquid inlet pipe 2-2, the first trough body 3 and the liquid outlet pipe 2-5 can be removed in this patent, and overflow and covering with a liquid film can also be achieved. The first trough body 3 and the liquid outlet pipe 2-5 are set in this embodiment to achieve the recycling of liquid.

[0055] When laser processing is performed in the air, it is difficult to discharge the molten metal and the plasma in the processing process shields the laser, which leads to the easy formation of a recast layer on the surface, poor processing accuracy, and an uneven surface. The present invention realizes liquid-assisted preparation of the liquid-absorbing core through the structural design of the overflow trough, and liquid-assisted laser processing suppresses plasma generation through a liquid film, thereby improving the laser energy transfer efficiency, promoting the discharge of molten metal, avoiding the recast layer, significantly improving the surface flatness and pattern resolution, and enhancing the processing effect and efficiency.

[0056] Example 3.

[0057] like Figure 5 As shown, the present invention provides a method for preparing a liquid-absorbing core based on the overflow groove provided in Example 1, comprising:

[0058] Pull the workpiece out of the unwinding mechanism, then pass the workpiece through the two gaps along the X direction, and then fix one end of the workpiece to the reeling mechanism;

[0059] Connect the liquid inlet pipe to the liquid pump and inject liquid into the overflow tank to ensure that the liquid film covers the upper surface of the workpiece;

[0060] The winding mechanism is opened to drive the workpiece to move in the X direction, and the laser is turned on at the same time, and a primary groove structure is processed on the workpiece under the liquid film by the laser, and a secondary groove structure is processed on the workpiece under the liquid film by the laser;

[0061] When the part to be processed of the workpiece comes out of the liquid film, a secondary micro-groove structure is processed by laser in the air to obtain a liquid-absorbing core with a multi-level groove structure.

[0062] like Figure 3 As shown, the moving direction of the workpiece 2 is the X direction.

[0063] Example 4.

[0064] like Figure 6 and Figure 7 As shown, the present invention provides a method for preparing a liquid-absorbing core based on the overflow groove provided in Example 2, comprising:

[0065] Step 1: Before the experiment, the aluminum-based thin film roll material to be processed (i.e. Figure 7 The metal sheet shown in the figure was immersed in acetone, anhydrous ethanol and deionized water, ultrasonically cleaned and dried.

[0066] Step 2: Load the aluminum-based sheet roll material to be processed onto the unwinding rotating motor (i.e., unwinding mechanism), and then lead it through the Figure 1 The gap 7 shown is used to load the end passing through the gap 7 onto the winding rotating motor (i.e., the winding mechanism) and ensure that the workpiece is within the appropriate processing area of ​​the laser.

[0067] Step 3: Set up multiple scanning segments in the MarkingMate software and set it to repeat automatic engraving.

[0068] Step 4: Turn on the submersible pump and inject deionized water into the second tank, keeping the water circulating and the liquid film covering the upper surface of the aluminum-based sheet.

[0069] Step 5: Turn on the rotary motor to rotate at the set speed, drive the aluminum-based sheet roll out from the rolling-out rotary motor rotating shaft, pass through the gap 7 and roll into the rolling-in motor rotating shaft; at the same time, turn on the laser to start processing according to the scanning line segment set in the MarkingMate software. The liquid-gas composite, multi-channel and multi-level preparation of the liquid absorbent core is realized.

[0070] Step 6: After the processing is completed, turn off the laser, the winding rotating motor, the unwinding rotating motor, and the submersible pump in sequence, remove the finished wick prepared on the rotating shaft of the winding rotating motor, put it into a vacuum drying oven for drying, and complete the entire preparation process.

[0071] Among them, Figure 7 As shown, step 5 mainly includes two parts. The first part is to perform laser processing in deionized water to form a primary groove structure and a secondary groove structure. The groove depth of the primary groove structure is 50~500μm. Compared with processing in air, this method can easily achieve high-precision processing of a groove structure with a large aspect ratio and has higher surface quality. The specific principle analysis is shown in Example 1; the second part is to use the melt generated by strong laser ablation in air, and change the aggregation morphology of the melt by controlling the laser scanning path, so as to prepare a secondary micro-groove structure with a nanoscale structure on the surface of the primary groove structure.

[0072] The multi-level groove structure prepared is as follows Figure 8 shown.

[0073] In the above method, the groove is formed by the superposition of the laser spot in the X direction and the Y direction. Figure 6 As shown, during the processing, the laser beam driven by the galvanometer moves rapidly along the X direction, and the processing of groove structures with different numbers, widths and distribution periods can be achieved simply by setting different motion trajectories.

[0074] The workpiece is driven by a linear motion platform or a rotating shaft to form a linear motion in the Y direction. By controlling the movement speed of the workpiece and the size of the laser energy density, groove structures of different depths can be processed. Fig.10 As shown, due to the cooling effect of the liquid and the bubble effect induced by the laser, the molten product can be taken away from the processing area in time, effectively reducing the heat affected zone and inhibiting the accumulation of processed products, thereby processing an array groove structure with a large aspect ratio.

[0075] When the workpiece is in the form of a strip and roll, it can be Fig. 9 The method shown can realize the processing of large-scale multi-channel and multi-level groove structures. Fig. 9 In the figure, the left half is the set laser processing path, and the right half is the set laser scanning direction. The laser scans in the Y direction and moves the workpiece in the X direction to process multiple grooves.

[0076] When processing multiple multi-level groove structures at the same time, the principle of multi-laser spot overlap is as follows Fig.11 As shown, Fig.11 middle, x Indicates the laser processing settings x direction, y Indicates the laser processing settings y direction, Δx Indicates laser processing x The center distance between two adjacent light spots in the direction, Δy Indicates laser processing y The center distance between two adjacent light spots in the direction, dl Indicates the center distance between two adjacent light spots during laser processing. c ij Indicates the laser processing i Ranking j A light spot, i The value range is 1 to m integer, j The value range is 1 to n integer, m Indicates laser processing y Maximum number of directional spots, n Indicates laser processing x The maximum number of directional light spots.

[0077] The method for preparing the liquid absorbent core provided by the present invention has the following advantages:

[0078] (1) Compared with samples prepared by laser modification in air, the absorbent core prepared by liquid-assisted laser has higher capillary force, pattern resolution, and processing surface flatness; (2) The ultra-high scanning speed of the laser galvanometer combined with the multi-channel laser scanning pattern can realize the simultaneous preparation of multiple absorbent cores, greatly improving the preparation efficiency of the absorbent core; (3) The design of the double nested water tank combined with the ultra-high scanning speed of the laser galvanometer and the interval scanning pattern enables the liquid composite air processing absorbent core to be completed in one step without the need for secondary processing, greatly improving the processing efficiency; (4) The one-step liquid composite air laser processing absorbent core has greatly improved the performance compared with the absorbent core prepared simply in air; (5) The aluminum-based thin sheet to be processed is controlled by a rotating motor to pass through the gap above the second trough body and enter the liquid-assisted processing area, and then enter the air-assisted processing area after passing through the gap. Finally, the prepared absorbent core is rolled and packaged by the rotating motor, which optimizes the workpiece assembly process and greatly improves the processing efficiency; (6) The gap is formed by the sealing connection between the first connecting part and the second connecting part, which optimizes the process of assembling the workpiece to be processed and improves the processing efficiency. In summary, the present invention greatly improves the efficiency of wick preparation through a one-step method, a multi-channel laser scanning method, and optimization of the workpiece fixing process, and can achieve high-efficiency preparation in large quantities; through liquid assistance and air compounding, a wick structure with high capillary force and high surface flatness can be prepared.

[0079] Example 5.

[0080] like Fig.12 As shown, the difference between this embodiment and embodiment 2 is that it also includes a wire electrode 9, and the wire electrode 9 is added at the edge of the laser beam motion track, and the wire electrode 9 is used as a cathode, as shown in FIG. Fig.13 As shown, the workpiece 2 is used as the anode, the anode is connected to the negative electrode of the pulse power supply 10, the cathode is connected to the positive electrode of the pulse power supply 10, and the liquid 6 is selected as a sodium nitrate solution (the liquid 6 can be a neutral electrolyte and is not limited to a sodium nitrate solution). The combined effect of the generated electric field and the laser field is utilized to improve the removal speed and surface quality of the material in the processing area.

[0081] Fig.12 A groove for placing the wire electrode 9 is added to the frame for electrolysis-assisted laser processing, and a composite liquid, air, and electrochemical composite processing has an ultra-thin liquid-absorbing core with higher capillary force, pattern resolution, and processing surface flatness.

[0082] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An overflow trough for assisting in the preparation of a liquid-absorbing core, characterized in that: The invention comprises a second tank body, a liquid inlet pipe and a frame body; the liquid inlet pipe is connected with the second tank body and the outside of the overflow tank; the frame body and the second tank body are quadrilaterals of the same shape in a top view; two non-adjacent surfaces in the frame body and two non-adjacent surfaces in the second tank body are sealed and connected; a gap is left between the other two surfaces in the frame body and the other two surfaces in the second tank body; the gap is used to accommodate a workpiece to be processed when assisting in the preparation of a liquid absorbent core; the height of the gap is greater than the thickness of the workpiece; the height of the gap is also less than the maximum height under the premise of accommodating the workpiece so that liquid will not flow out of the gap; an overflow port is provided on the frame body; when the workpiece is accommodated in the gap and liquid is passed into the liquid inlet pipe, the upper surface of the workpiece is covered with a liquid film.

2. The overflow trough for assisting in preparing a liquid-absorbing core according to claim 1, characterized in that: Also includes a first connecting portion and a second connecting portion; When assisting in the preparation of the absorbent core, the moving direction of the workpiece to be processed is the X direction, the direction perpendicular to the moving direction on the plane where the workpiece is located is the Y direction, the frame body and the second trough body are both rectangular, there are two second connecting parts and they are respectively arranged on the tops of the two sides of the second trough body in the Y direction, there are two first connecting parts and they are respectively arranged on the bottoms of the two sides of the frame body in the Y direction, the first connecting parts are sealed and connected with the corresponding second connecting parts, the gaps are located between the two sides of the frame body in the X direction and the two sides of the corresponding second trough body in the X direction, and there are two gaps in total; The first connecting portion is a convex portion, the second connecting portion is a concave portion, and the convex structure in the convex portion matches the concave structure in the concave portion.

3. The overflow trough for assisting in preparing a liquid-absorbing core according to claim 1, characterized in that: It also includes a first tank body and a liquid outlet pipe; The second tank body is located in the first tank body and is higher than the first tank body, and the liquid outlet pipe is connected with the first tank body and the outside of the overflow tank.

4. The overflow trough for assisting in preparing a liquid-absorbing core according to claim 2, characterized in that: The overflow port is arranged on the surface of the frame body where the next gap in the X direction is located.

5. The overflow trough for assisting in preparing a liquid-absorbing core according to claim 2, characterized in that: The width of the overflow port is the distance between the two inner walls of the frame in the Y direction.

6. The overflow trough for assisting in preparing a liquid-absorbing core according to claim 1, characterized in that: The liquid inlet pipe also passes through the groove wall of the first groove body.

7. The overflow trough for assisting in preparing a liquid-absorbing core according to claim 1, characterized in that: The maximum height at which the liquid does not flow out of the gap under the premise of accommodating the workpiece is 0.5 mm.

8. A method for preparing a liquid-absorbing core based on the overflow trough according to any one of claims 1 to 7, characterized in that: include: Pull the workpiece out of the unwinding mechanism, then pass the workpiece through the two gaps along the X direction, and then fix one end of the workpiece to the reeling mechanism; Connect the liquid inlet pipe to the liquid pump and inject liquid into the overflow tank to ensure that the liquid film covers the upper surface of the workpiece; The winding mechanism is opened to drive the workpiece to move in the X direction, and the laser is turned on at the same time, and a primary groove structure is processed on the workpiece under the liquid film by the laser, and a secondary groove structure is processed on the workpiece under the liquid film by the laser; When the part to be processed of the workpiece comes out of the liquid film, a secondary micro-groove structure is processed by laser in the air to obtain a liquid-absorbing core with a multi-level groove structure.

9. The method for preparing a liquid absorbent core according to claim 8, characterized in that: Before the winding mechanism and the laser are turned on, the method further includes setting a cathode at the edge of a preset laser beam motion trajectory, using the workpiece as an anode, connecting the anode to the negative electrode of a pulse power supply, and connecting the cathode to the positive electrode of the pulse power supply; At this time, the liquid is a neutral electrolyte.

10. The method for preparing a liquid absorbent core according to claim 9, characterized in that: The neutral electrolyte includes a sodium nitrate solution.

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