Groove cover structure of wet etching machine

Abstract

The utility model discloses a groove cover structure of a wet etching machine, which comprises an overturning shaft and a cover body, the upper part and the lower part of the overturning shaft form a mounting surface, the cover body comprises an upper cover plate, a lower cover plate and an end sealing plate, the overturning shaft, the upper cover plate and the lower cover plate form a closed cavity, and a medium inlet and outlet flow channel communicated with the cavity is formed on the overturning shaft; the upper surface of the upper cover plate is provided with an inclined surface from top to bottom, and a groove which is recessed inwards from the top is further formed in the inclined surface. On one hand, on the basis of the formation of the cavity and the flowing of a medium, the temperature in the tank cover is controlled, and particularly, dropping liquid generated due to a condensation phenomenon is reduced; and on the other hand, the upper surface of the upper cover is inclined and is provided with the groove, so that alkali liquor possibly dropping to the upper cover plate is drained to the liquid drainage groove, large-area white dirt is prevented from being formed on the surface of the groove cover, the cleanliness of a machine table is improved, and meanwhile, the contact area of the groove cover and the overturning shaft is increased, so that the firmness of connection between the groove cover and the overturning shaft is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of solar cell processing, and particularly relates to a tank cover structure of a wet etching machine. Background Art

[0002] A solar cell, also known as a "solar chip" or "photovoltaic cell", is a thin film of a photoelectric semiconductor that directly converts sunlight into electricity. In the existing manufacturing process of crystalline silicon solar cell wafers, wet etching technology is used multiple times during the manufacturing process. The etching process is a key step in the battery manufacturing process, and the quality of etching directly affects the performance of the battery wafers.

[0003] Currently, the etching of the battery manufacturing production line consists of a corrosion-resistant rectangular tank, a planar cover plate with a symmetrical switch, and an opening and closing mechanism. Among them, there are multiple plastic reinforcing ribs on the upper surface of the tank cover to enhance the overall strength of the tank cover, so that the tank cover will not be damaged during frequent opening and closing. The transmission device of the opening and closing mechanism is a columnar turning shaft structure, and both sides of the turning shaft are connected to the machine table by gears; one end of the tank cover is directly fixed to the surface of the turning shaft by plastic screws. When the silicon material in the tank is etched, the tank cover is opened, and the robotic arm will clamp the silicon material out of the tank, and then the tank cover is closed. Therefore, the opening and closing of the tank cover meet the etching requirements of the silicon material. However, in actual operation, the following technical problems exist:

[0004] 1) When the silicon material is taken out, the residual alkali solution on the surface will drip onto the upper surface of the tank cover. Since the tank cover is a horizontal structure and there are multiple reinforcing ribs on the upper surface of the tank cover to enhance the strength of the tank cover, the alkaline liquid accumulated on the cover plate cannot be discharged in time, resulting in large-area white dirt on the surface of the tank cover after the alkali solution crystallizes;

[0005] 2) The connection method of the tank cover is directly fixed to the surface of the arc-shaped turning shaft by multiple plastic screws, and the connection is relatively unstable;

[0006] 3) During the etching of the silicon material, due to the large temperature difference between the tank cover and the inside of the tank, the evaporated water vapor will gather on the lower surface of the tank cover. After the water vapor condenses into water droplets, it will drip onto the battery wafers being etched again to form black spots or black dots, which not only directly affects the quality of the battery wafers (such as the A-grade product rate), but also the impurities on the tank cover will fall into the tank with the condensate to contaminate the alkali solution in the tank. Content of the Utility Model

[0007] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an improved tank cover structure of a wet etching machine.

[0008] To solve the above technical problems, the technical solutions adopted by the utility model are as follows:

[0009] A trough cover structure of a wet etching machine, which includes a turning shaft and a cover body formed on the turning shaft. Installation surfaces are formed at the upper and lower parts of the turning shaft. The cover body includes an upper cover plate, a lower cover plate and end sealing plates. The upper cover plate and the lower cover plate respectively fit the installation surfaces of the turning shaft from one side up and down, and the sides of the upper cover plate and the lower cover plate away from the turning shaft are relatively close and fit. The turning shaft, the upper cover plate and the lower cover plate form a closed cavity, and a medium inlet and outlet flow channel communicating with the cavity is formed on the turning shaft. The upper surface of the upper cover plate has an inclined surface from top to bottom, and a groove recessed inward from the top is also formed on the inclined surface.

[0010] Preferably, the installation surfaces are flat and parallel up and down; the corresponding side edges of the upper cover plate and the lower cover plate are both parallel and fit to the installation surfaces. In this way, the contact area between the trough cover plate and the turning shaft is increased, and screw connection is carried out on the contact surface, which can effectively enhance the firmness of the connection.

[0011] According to a specific implementation and preferred aspect of the present invention, the lower cover plate is horizontally arranged; the upper cover plate includes a first panel horizontally arranged with the lower cover plate and a second panel inclined downward and inward from the side edge of the first panel away from the turning shaft. The angle formed between the second panel and the first panel is an obtuse angle. In short, the trough cover is a double-layer structure, with an inclined upper surface and a horizontal lower surface. The inclined upper cover can drain the dripping alkali liquid to the drainage trough, significantly improving the cleanliness of the machine table. At the same time, both the upper and lower surfaces use the same hydrophobic material as the existing trough cover.

[0012] Preferably, there is at least one second panel. When there are N second panels, N≥2 and N is a positive integer, the angle formed between each adjacent two second panels is an obtuse angle, and under the sequential layout of multiple second panels, the angles formed by the multiple second panels and the first panel gradually become smaller.

[0013] Furthermore, there are multiple grooves, and they are spaced apart on the second panel.

[0014] In some specific implementation manners, the grooves extend along the length direction of the turning shaft; and / or, the grooves are evenly spaced on the second panel.

[0015] Preferably, the length of the first panel is greater than the width of the installation surface, and the length of the first panel is less than the length of the second panel.

[0016] According to another specific implementation and preferred aspect of the present invention, the grooves are inclined inward from the middle to both ends, and the included angle between the extending direction of the inclined grooves and the lower surface of the corresponding upper cover plate is 1 to 2°; the drainage grooves are in the same extending direction as the grooves. It is more conducive to the discharge of accumulated liquid.

[0017] Preferably, both the grooves and the drainage grooves are symmetrically arranged about their own middles.

[0018] Further, the cross-section of the groove is a polygon or an arc with an open top; the cross-section of the diversion groove is a polygon or an arc with an open top. Generally, the cross-section of the groove is a square with an open top, and the cross-section of the diversion groove is a circular arc with an open top.

[0019] According to another specific implementation and preferred aspect of the present utility model, the cover body further includes a plurality of groups of reinforcing ribs disposed in the cavity. That is, reinforcing ribs are added in the cavity between the upper and lower covers to increase the overall structural strength of the groove cover.

[0020] Preferably, the plurality of groups of reinforcing ribs are spaced along the length direction of the rotation axis.

[0021] Each group of reinforcing ribs includes an upper reinforcing rod and a lower reinforcing rod respectively connected to the inner walls of the upper cover and the lower cover, and a connecting rod for connecting the upper reinforcing rod and the lower reinforcing rod.

[0022] Preferably, one end of the upper reinforcing rod and the lower reinforcing rod is connected to the rotation axis, and the other ends of the upper reinforcing rod and the lower reinforcing rod are fixedly connected to form an inner support sharp angle. The connecting rod includes a first connecting rod connecting the upper reinforcing rod, the lower reinforcing rod and the rotation axis; a second connecting rod intersecting both the upper reinforcing rod and the lower reinforcing rod.

[0023] Due to the implementation of the above technical solutions, the present utility model has the following advantages compared with the prior art:

[0024] In the existing trough cover structure, when the silicon material is taken out, the residual lye on the surface will drip onto the upper surface of the trough cover plate. Since the trough cover is a horizontal structure and there are multiple reinforcing ribs on the upper surface of the trough cover to enhance the strength of the trough cover, the alkaline liquid accumulated on the cover plate cannot be discharged in time. As a result, after the lye crystallizes, a large area of white dirt will form on the surface of the trough cover. Then, the connection method of the trough cover uses multiple plastic screws to be directly fixed on the surface of the arc-shaped turning shaft, and the connection is relatively unstable. In addition, during the etching of the silicon material, due to the large temperature difference between the trough cover and the inside of the trough body, the evaporated water vapor will gather on the lower surface of the trough cover. After the water vapor condenses into water droplets, it will drip onto the battery cells being etched again to form black spots or black dots, which not only directly affects the quality of the battery cells (such as the A-grade product rate), but also the impurities on the trough cover will drip into the trough body along with the condensate to contaminate the lye in the trough body and so on. The overall design of the trough cover structure of the present utility model ingeniously solves various deficiencies of the existing structure. After adopting this trough cover structure, there is a cover body with a double-layer structure and a cavity formed inside. The cover body and the turning shaft are relatively fixed by fitting the installation surface. At the same time, the flowing medium can enter and exit the cavity to achieve temperature control of the trough cover. Then, under the layout of the upper surface being an inclined plane and a groove, the lye dripping onto the upper cover plate is drained to the drain groove. Therefore, on the one hand, based on the formation of the cavity and the flow of the medium, the temperature inside the trough cover is controlled, especially reducing the dripping liquid caused by the condensation phenomenon. On the other hand, the upper surface of the upper cover is inclined and equipped with grooves, so as to drain the lye that may drip onto the upper cover plate to the drain groove, avoid the formation of a large area of white dirt on the surface of the trough cover, improve the cleanliness of the machine table, and at the same time increase the contact area between the trough cover and the turning shaft to increase the firmness of the connection between the trough cover and the turning shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the trough cover structure of this embodiment;

[0026] Figure 2 is Figure 1 the structural decomposition diagram of;

[0027] Figure 3 is Figure 1 the front view schematic diagram of;

[0028] Figure 4 is Figure 3 the top view schematic diagram of;

[0029] Figure 5 is Figure 4 the sectional view taken along the A-A direction in;

[0030] Figure 6 is Figure 4 the sectional view taken along the B-B direction in;

[0031] Wherein: 1. Rotation axis; 10. Mounting surface; 11. Medium inlet and outlet flow channel; 2. Cover body; 20. Upper cover plate; 201. First panel; 202. Second panel; M. First plate body; N. Second plate body; 20a. Groove; 20b. Flow guiding groove; b1. First cut-off corner; b2. Second cut-off corner; 21. Lower cover plate; 21a. Hem; 22. End sealing plate; 23. Reinforcing rib; 231. Upper reinforcing rod; 232. Lower reinforcing rod; 233. Connecting rod; a. First connecting rod; b. Second connecting rod; A. Inner support sharp angle; Q. Cavity. Detailed implementation mode

[0032] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following combines the drawings with the detailed implementation mode to make a detailed description of the present utility model. Many specific details are set forth in the following description to facilitate a full understanding of the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0033] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0035] In the present utility model, unless otherwise clearly specified and limited, the terms "mount", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] In a utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0037] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0038] As Figures 1 to 6 shown, the slot cover structure provided in this embodiment includes a turning shaft 1 and a cover body 2 formed on the turning shaft 1, wherein the cover body 2 includes an upper cover plate 20, a lower cover plate 21, end sealing plates 22 and reinforcing ribs 23.

[0039] Specifically, parallel mounting surfaces 10 are respectively formed on the upper and lower parts of the turning shaft 1, wherein the mounting surfaces 10 are flat surfaces, the cover body 2 is mounted on the corresponding mounting surfaces 10, the radius of the turning shaft 1 is 4 cm, and the distance between the upper and lower mounting surfaces 10 is 6 cm.

[0040] In some specific embodiments, the upper cover plate 20 and the lower cover plate 21 respectively fit the mounting surfaces 10 of the turning shaft 1 from one side up and down, and the sides of the upper cover plate 20 and the lower cover plate 21 away from the turning shaft 1 are relatively close and fit to form a rounded corner transition. There are two end sealing plates 22 that close the two ends of the cup cover and the space between the turning shafts 1 to form a cavity Q.

[0041] In this example, the lower cover plate 21 is horizontally arranged, and a curled edge 21a is formed at the end away from the turning shaft 1. That is, the curled edge 21a and the side of the upper cover plate 20 away from the turning shaft 1 are relatively close and fit to form a rounded corner transition; the upper cover plate 20 includes three panels. Among them, the first panel 201 is horizontally arranged with the lower cover plate 21. There are two second panels 202, which are respectively defined as the first plate body M and the second plate body N. The first plate body M is located on the right side of the first panel 201, and the angle formed between the first plate body M and the first panel 201 is an obtuse angle (about 175°). The second plate body N is located on the right side of the first plate body M, and the angle formed between the second plate body N and the first plate body M is an obtuse angle (about 175°). Then, the angle formed between the first panel 201 and the first plate body M is greater than the angle formed between the second plate body N and the first plate body, so as to gradually become smaller to form a corresponding inclined surface. At the same time, the length of the first panel 20 is greater than the width of the installation surface 10, and the length of the first panel 20 is less than the length of the first plate body M, and the length of the first plate body M is less than the length of the second plate body N. The thickness of the lower cover plate 21 is 1 cm, and the width is 90 cm; the upper cover plate 20 is composed of three parts. The first panel completely covers the upper surface of the turning shaft 1 and partially extends beyond it. The length of the first panel is about 20 cm, the length of the first plate body M is about 22 cm, the length of the second plate body N is about 23.5 cm, and the overall thickness is 1 cm, and the width is the same as that of the lower cover plate.

[0042] In some specific embodiments, grooves 20a extending along the length direction of the turning shaft 1 are respectively provided on the inclined surfaces (upper surfaces) of the first plate body M and the second plate body N. A diversion groove 20b extending in the same direction as the grooves 20a is also provided at the rounded corner formed by the second plate body N and the lower cover plate 21. The grooves 20a are inclined inward from the middle to both ends. The included angle between the inclined extension direction of the groove 20a on the first plate body M and the lower surface of the first plate body M is 1-2°; the included angle between the inclined extension direction of the groove 20a on the second plate body and the lower surface of the second plate body is 1-2°; the diversion groove 20b extends in the same direction as the grooves 20a. It is more conducive to the discharge of the accumulated liquid. In this example, the grooves 20a on the first plate body M and the second plate body N are equally spaced.

[0043] In this example, both the grooves 20a and the diversion groove 20b are symmetrically arranged about their own middles. The cross-section of the groove 20a is a square with an open top, and the cross-section of the diversion groove 20b is an arc with an open top. The diversion groove 20b is formed by splicing a first cut-off corner b1 and a second cut-off corner b2 formed on the second plate body N and the curled edge 21a.

[0044] In some specific embodiments, medium inlet and outlet channels 11 arranged side by side and communicating with the cavity Q are further provided on the turning shaft 1. Among them, heating or cooling medium is introduced into the cavity Q through the medium inlet and outlet channels 11 to implement stable control of the groove cover.

[0045] In addition, there are multiple groups of reinforcing ribs 23, and they are spaced apart along the length direction of the flip axis 1, each group of reinforcing ribs 23 includes an upper reinforcing rod 231 and a lower reinforcing rod 232 respectively connected to the inner walls of the upper cover plate 20 and the lower cover plate 21, and a connecting rod 233 for connecting the upper reinforcing rod 231 and the lower reinforcing rod 232, wherein one end of the upper reinforcing rod 231 and the lower reinforcing rod 232 are connected to the flip axis 1, and the other end of the upper reinforcing rod 231 and the lower reinforcing rod 232 are fixedly connected to form an inner support angle A, and the tip of the inner support angle A is rounded, and the connecting rod 233 includes a first connecting rod a connecting the upper reinforcing rod 231, the lower reinforcing rod 232 and the flip axis 1; and a second connecting rod b intersecting with the upper reinforcing rod 231 and the lower reinforcing rod 232. In this example, the first connecting rod a is arc-shaped and wraps around the inner wall of the flip axis 1, and the second connecting rod b is a straight rod and is arranged along the up and down direction. In short, reinforcing ribs are added to the cavity between the upper and lower cover plates to increase the overall structural strength of the slot cover. In this example, there are five groups of reinforcing ribs 23, which are evenly spaced and have a thickness of 1 cm. The entire ribs fit the arc surface of the upper and lower cover plates and the flip axis 1. Since the thickness condition is not met near the closure of the two slot covers, the overall length of the reinforcing ribs is reduced, and an arc with a radius of 1 cm is used as the connection point. A support structure with a left and right width of 1 cm is added at a distance of 12 cm, 24 cm, and 36 cm from the reinforcing ribs at the left arc; the thickness of each group of reinforcing ribs is 2 cm. At the same time, three groups of plastic screws are added to the lower cover plate, five in each group, and the corresponding positions of the three groups are the three support columns on each reinforcing rib, and each group of five corresponds to five reinforcing ribs. The upper and lower cover plates are also connected to the flip axis plane by five plastic screws, and the connection position is the center line of the flip axis plane. As for the medium inlet and outlet flow channel 11, it is a rectangular hole that is arranged side by side, evenly spaced, and through. In general, it is used to pass the heating gas, so as to reduce the dripping caused by condensation.

[0046] In summary, after adopting the slot cover structure, the cover body with a double-layer structure and a cavity formed inside is relatively fixed to the cover body and the flip shaft by fitting the mounting surface, and at the same time, the flowing medium can enter and exit the cavity to realize the temperature control of the slot cover, and then, under the layout of the upper surface as a slope and grooves, the alkali liquid dripping onto the upper cover plate is drained to the drainage trough. Therefore, on the one hand, the utility model is based on the formation of the cavity and the flow of the medium to realize the control of the internal temperature of the slot cover, especially to reduce the dripping caused by condensation; on the other hand, the upper surface of the upper cover is inclined and equipped with grooves, so as to drain the alkali liquid that may drip onto the upper cover plate to the drainage trough, thereby avoiding the formation of a large area of ​​white dirt on the surface of the slot cover, improving the cleanliness of the machine, and at the same time, by increasing the contact area between the slot cover and the flip shaft, the firmness of the connection between the slot cover and the flip shaft is increased.

[0047] The above has made a detailed description of the present utility model, aiming to enable those skilled in this field of technology to understand the content of the present utility model and implement it. However, it cannot be used to limit the protection scope of the present utility model. Any equivalent changes or modifications made according to the spirit and essence of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A slot cover structure of a wet engraving machine, comprising a flip shaft (1) and a cover body (2) formed on the flip shaft (1), characterized in that: Mounting surfaces (10) are formed at the upper and lower parts of the flip shaft (1); the cover body (2) comprises an upper cover plate (20), a lower cover plate (21) and an end sealing plate (22); the upper cover plate (20) and the lower cover plate (21) are respectively fitted to the mounting surface (10) of the flip shaft (1) from one side up and down, and the upper cover plate (20) and the lower cover plate (21) are relatively close to and fitted to the side away from the flip shaft (1); the flip shaft (1), the upper cover plate (20) and the lower cover plate (21) constitute a closed cavity (Q), and a medium inlet and outlet flow channel (11) connected to the cavity (Q) is formed on the flip shaft (1); the upper surface of the upper cover plate (20) has an inclined surface from top to bottom, and a groove (20a) recessed inward from the top is also formed on the inclined surface.

2. The slot cover structure of the wet engraving machine according to claim 1, characterized in that: The mounting surface (10) is a plane and parallel to the top and the bottom; corresponding sides of the upper cover plate (20) and the lower cover plate (21) are attached to the mounting surface (10).

3. The slot cover structure of the wet engraving machine according to claim 2, characterized in that: The lower cover plate (21) is arranged horizontally; the upper cover plate (20) comprises a first panel (201) arranged horizontally with the lower cover plate (21), and a second panel (202) extending downward and inwardly from the side of the first panel (201) away from the flip axis (1), wherein the angle formed between the second panel (202) and the first panel (201) is an obtuse angle.

4. The slot cover structure of the wet engraving machine according to claim 3, characterized in that: The second panel (202) has at least one piece, and when there are N pieces, N≥2, and N is a positive integer, the angle formed between every two adjacent second panels (202) is an obtuse angle, and when the plurality of second panels (202) are arranged in sequence, the angle formed between the plurality of second panels (202) and the first panel (201) gradually decreases.

5. The slot cover structure of the wet engraving machine according to claim 4, characterized in that: There are a plurality of grooves (20a), which are distributed at intervals on the second panel (202).

6. The slot cover structure of the wet engraving machine according to claim 5, characterized in that: The grooves (20a) extend along the length direction of the flip axis (1); and / or the grooves (20a) are evenly spaced and distributed on the second panel (202).

7. The slot cover structure of the wet engraving machine according to claim 3, characterized in that: The length of the first panel (201) is greater than the width of the installation surface (10), and the length of the first panel (201) is less than the length of the second panel (202).

8. The slot cover structure of the wet engraving machine according to claim 1, characterized in that: The sides of the upper cover plate (20) and the lower cover plate (21) away from the flip axis (1) are butted together to form a rounded transition, and a guide groove (20b) is formed at the upper part of the rounded corner.

9. The slot cover structure of the wet engraving machine according to claim 8, characterized in that: The groove (20a) is arranged to be inclined inward from the middle to both ends, wherein the angle formed between the extension direction of the inclined groove (20a) and the lower surface of the corresponding upper cover plate (20) is 1-2°; the guide groove (20b) and the groove (20a) extend in the same direction.

10. The slot cover structure of the wet engraving machine according to claim 9, characterized in that: The groove (20a) and the guide groove (20b) are both arranged symmetrically with respect to their middle parts.

11. The slot cover structure of the wet engraving machine according to claim 8, 9 or 10, characterized in that: The cross section of the groove (20a) is a polygon or arc shape with an open top; the cross section of the guide groove (20b) is a polygon or arc shape with an open top.

12. The slot cover structure of the wet engraving machine according to claim 1, characterized in that: The cover body (2) further comprises a plurality of groups of reinforcing ribs (23) arranged in the cavity (Q); the plurality of groups of reinforcing ribs (23) are spaced apart and distributed along the length direction of the flip axis (1).

13. The slot cover structure of the wet engraving machine according to claim 12, characterized in that: Each of the reinforcing ribs (23) comprises an upper reinforcing rod (231) and a lower reinforcing rod (232) respectively connected to the inner walls of the upper cover plate (20) and the lower cover plate (21), and a connecting rod (233) used to connect the upper reinforcing rod (231) and the lower reinforcing rod (232).

14. The slot cover structure of the wet engraving machine according to claim 13, characterized in that: One end of the upper reinforcing rod (231) and the lower reinforcing rod (232) is connected to the flip shaft (1), and the other end of the upper reinforcing rod (231) and the lower reinforcing rod (232) are fixedly connected to form an inner support angle.

15. The slot cover structure of the wet engraving machine according to claim 14, characterized in that: The connecting rod (233) comprises a first connecting rod (a) connecting the upper reinforcing rod (231), the lower reinforcing rod (232) and the tilting shaft (1); and a second connecting rod (b) arranged to intersect the upper reinforcing rod (231) and the lower reinforcing rod (232).

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