Stainless steel sunken invisible art well lid and production process thereof

Abstract

The application discloses a stainless steel sunken invisible artistic well lid and a production process thereof, and belongs to the technical field of artistic well lids. The application discloses a stainless steel sunken invisible artistic well lid and a production process thereof, which comprises an auxiliary frame for well lid installation, one side of the inside of the auxiliary frame is provided with a limiting ring; one side of the outside of the telescopic rod is provided with a pushing spring, one end of the telescopic rod is provided with a third rotating connecting shaft, and the two ends of the pushing spring are fixedly connected with the third rotating connecting shaft and the telescopic rod respectively. The application solves the problem that the existing sunken well lid is difficult to open because the user bears the whole weight of the sunken well lid itself, and the telescopic rod can be telescoped in the rotating process, the elasticity of the pushing spring can push and assist the rotation of the stainless steel well lid at the same time, and the user's body is prevented from being damaged due to the adjustment of the state of the stainless steel well lid.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of artistic manhole covers, in particular to a stainless steel sunken invisible artistic manhole cover and a production process thereof. BACKGROUND

[0002] Artistic manhole covers are collectively referred to as silver manhole covers, cultural manhole covers, Japanese manhole covers, painted manhole covers, copper manhole covers, cosmetic manhole covers, and decorative manhole covers. The characteristic of such manhole covers is that the anti-slip patterns on the cover surface are composed of lines that can form patterns, and the patterns formed by the lines must be personalized anti-slip patterns with regional, enterprise, or personal culture and value proposition, or can promote their understanding of beauty. Such manhole covers are commonly referred to as artistic manhole covers. During installation, the artistic manhole covers are recessed to the lower end of the installation position to avoid protruding and affecting the use of the outside.

[0003] A nodular cast iron sunken manhole cover is disclosed in Chinese Patent No. CN212715031U, which includes a base, a filter hopper fixedly connected to the bottom of the base, a first hydraulic cylinder fixedly connected to the inner wall of the base, a first hydraulic rod fixedly connected to the output end of the first hydraulic cylinder, an activity block fixedly connected to one end of the first hydraulic rod, an activity rod fixedly connected to the inner wall of the activity block, and a second hydraulic cylinder movably connected to the outer wall of the activity rod. The nodular cast iron sunken manhole cover is convenient to use, avoids manual opening of the manhole cover, saves time and effort, brings convenience to the work of the staff, improves the work efficiency of the staff, shortens the working time of the staff, reduces the labor intensity of the staff, solves the problem of inconvenient use of general nodular cast iron sunken manhole covers, and thus brings convenience to the work and life of people.

[0004] The sunken manhole cover of the above-mentioned patent has the problem that, during actual use, the user needs to bear the entire weight of the sunken manhole cover itself when opening the sunken manhole cover, which affects the opening efficiency of the user and the stability of the sunken manhole cover after opening. Therefore, it does not meet the existing needs, and thus we propose a stainless steel sunken invisible artistic manhole cover and a production process thereof. SUMMARY

[0005] The purpose of this invention is to provide a stainless steel recessed invisible art manhole cover and its manufacturing process. The stainless steel manhole cover rotates around a first rotating connecting shaft and unfolds to cover the sewer. Because the first and second rotating connecting shafts are at different rotational positions, the telescopic rod can extend and retract during rotation. Simultaneously, the rebound spring pushes and assists the rotation of the stainless steel manhole cover. The rebound spring efficiently completes stable opening and closing. Furthermore, the rebound spring pushes the stainless steel manhole cover in its unfolded and closed states, preventing external collisions from altering its open and closed state and avoiding injury to users due to adjustments in the manhole cover's position. This improves safety and efficiency during use, solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a stainless steel recessed invisible art manhole cover, comprising a manhole cover installation auxiliary frame, a limiting ring provided on one side inside the manhole cover installation auxiliary frame, a stainless steel manhole cover provided on the upper end outside the limiting ring, and the lower end of the stainless steel manhole cover being connected to the upper end of the limiting ring via a slot, a pulling groove provided on one side of the upper end of the stainless steel manhole cover, the pulling groove being embedded inside the stainless steel manhole cover, and an art engraving plate provided on one side outside the pulling groove, the art engraving plate being an integral structure with the stainless steel manhole cover;

[0007] It also includes telescopic rods, which are set on both sides of the lower end of the stainless steel manhole cover. A push spring is set on one side of the telescopic rod, and a third rotating connecting shaft is set at one end of the telescopic rod. The two ends of the push spring are respectively bonded and fixed to the third rotating connecting shaft and the telescopic rod. A third connecting support frame is set at both ends of the third rotating connecting shaft, and one end of the third connecting support frame is welded and fixed to the stainless steel manhole cover. Both ends of the third rotating connecting shaft are rotatably connected to the other side of the third connecting support frame. The outer side of the third rotating connecting shaft is welded and fixed to one end of the telescopic rod. A first rotating groove is set on one side of the upper end of the manhole cover installation auxiliary frame. A first connecting support frame is set between the first rotating groove and the stainless steel manhole cover. The first connecting support frame and the first rotating groove are rotatably connected by the first rotating connecting shaft. One end of the first connecting support frame is welded and fixed to one side of the stainless steel manhole cover.

[0008] Preferably, a pair of second rotating grooves are provided on one side of the outer side of the limiting ring, and both second rotating grooves penetrate and extend to the upper and lower ends of the limiting ring. A pair of second connecting support frames are provided on one side of the outer side of the two limiting rings. A second rotating connecting shaft is provided between the two second connecting support frames. Both ends of the outer side of the second rotating connecting shaft are rotatably connected to one side of the second connecting support frame. The outer side of the second rotating connecting shaft is welded and fixed to the other end of the telescopic rod.

[0009] Preferably, the stainless steel manhole cover has four drainage grooves arranged in a central ring inside, and the drainage grooves penetrate and extend to the upper and lower ends of the stainless steel manhole cover. A first item restriction strip is provided at the upper end of each of the four drainage grooves, a second item restriction strip is provided at the lower end of the first item restriction strip, and a third item restriction strip is provided at the lower end of the second item restriction strip. The exterior of the third item restriction strip, the second item restriction strip, and the first item restriction strip are all welded and fixed to the interior of the drainage groove.

[0010] Preferably, a first anti-clogging groove is provided at the upper end of the first item restriction strip, and a second anti-clogging groove is provided at the lower end of the first anti-clogging groove. Both the second anti-clogging groove and the first anti-clogging groove penetrate and extend into the interior of the first item restriction strip.

[0011] Preferably, a connecting frame is provided at each of the four corners of the lower end of the stainless steel manhole cover. The four connecting frames are welded and fixed together by a connecting plate. A temporary storage groove for items is provided at the upper end of the outer side of the connecting plate, and the temporary storage groove for items extends through and to both ends of the connecting plate. A fourth item restriction strip is provided inside the connecting plate, and the fourth item restriction strip is welded and fixed to the connecting plate. An item drop restriction frame is provided on one side of the connecting plate. A final item storage groove for items is provided inside the item drop restriction frame, and the final item storage groove for items is embedded inside the item drop restriction frame. The upper end of the item drop restriction frame is welded and fixed to the lower end of the stainless steel manhole cover.

[0012] The manufacturing process of stainless steel recessed concealed artistic manhole covers includes the following steps:

[0013] Step 1: Make the upper and lower halves of the corresponding manhole cover mold according to the customization requirements, place the upper and lower halves of the mold separately, pour sand on the outside of the two molds, and then pour adhesive on the outside of the sand.

[0014] Step 2: Place the sand with adhesive on it and the upper and lower halves of the corresponding manhole cover mold into a drying device for drying.

[0015] Step 3: Hold and rotate one of the two dried items. Then move the other dried item to the bottom of the previously rotated dried item, so that the corresponding surfaces of the two dried items are parallel. After applying adhesive to the surface of the bottom dried item, move the two dried items relative to each other and make them contact. After air drying, they will form a complete mold.

[0016] Step 4: Heat the stainless steel material while adding magnesium, silicon, and graphite during the heating process;

[0017] Step 5: Flow the heated molten metal into the corresponding complete mold made in Step 3, and add silicon again during the flow process;

[0018] Step 6: After adding and cooling, the mold and the solidified contents inside are conveyed together to the demolding device for demolding.

[0019] Step 7: Grind and cut the coated stainless steel item to achieve the required dimensions;

[0020] Step 8: Simulate the pressure of various usage environments to test the polished and cut stainless steel manhole covers;

[0021] Step 9: Apply asphalt paint to the stainless steel manhole cover, and then carve and further process the required images, text, and recess dimensions on the art engraving plate on the surface of the stainless steel manhole cover.

[0022] Step 10: Test the artistic stainless steel manhole cover again. Once the test is passed, the processing is considered complete.

[0023] Preferably, in step one, the mass of the sand covering the upper and lower halves of the manhole cover mold is 300 kilograms.

[0024] Preferably, the drying temperature in step two is between 50 and 80 degrees Celsius, and the drying time in step two is 20 minutes.

[0025] Preferably, in step three, one of the clamped drying items is rotated at an angle of 180 degrees.

[0026] Preferably, the heating temperature for the stainless steel material and the added magnesium, silicon and graphite in step four is 1,500 degrees Celsius.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. This invention features a pair of telescopic rods on both sides of the lower end of a stainless steel manhole cover. A push spring is located on one side of each telescopic rod, with a third rotating connecting shaft at one end of the push spring and a second rotating connecting shaft at the other end of the telescopic rod. In actual use, as the stainless steel manhole cover rotates around the first rotating connecting shaft and unfolds to cover the sewer, the different rotational positions of the first and second rotating connecting shafts allow the telescopic rods to extend and retract. Simultaneously, the elasticity of the push spring propels and assists the rotation of the stainless steel manhole cover. This elasticity allows for efficient and stable opening and closing. Furthermore, the elasticity of the push spring propels the unfolded and closed stainless steel manhole cover, preventing external collisions from altering its open and closed state and avoiding injury to users due to adjustments in the manhole cover's position. This improves safety and efficiency during use.

[0029] 2. This invention features a first item restriction strip at the upper end of the drainage groove, a second item restriction strip at the lower end of the first item restriction strip, and a third item restriction strip at the lower end of the second item restriction strip. The upper end of the first item restriction strip contains a first anti-clogging groove, and the lower end of the first anti-clogging groove contains a second anti-clogging groove. In actual use, when external foreign objects adhere to the upper surface of the first item restriction strip, they will pass through the indentations of the first and second anti-clogging grooves, reducing the adhesion area between the foreign object and the first item restriction strip. This reduced adhesion area prevents rainwater from being blocked from draining properly into the sewer, thus avoiding blockage. Furthermore, the cross-distribution of the second and third item restriction strips, combined with the upper first item restriction strip, effectively blocks foreign objects that are about to pass through the drainage groove and fall down, facilitating subsequent removal of fallen items. Simultaneously, the second, third, and first item restriction strips effectively increase the strength of the manhole cover itself, extending its service life. Attached Figure Description

[0030] Figure 1 This is a three-dimensional view of the external upper structure of the sunken invisible art manhole cover of the present invention.

[0031] Figure 2 This is a perspective view of the lower external structure of the sunken, concealed artistic manhole cover of the present invention.

[0032] Figure 3 For the present invention Figure 2 Enlarged view of a portion of region A in the middle;

[0033] Figure 4 This is a front view of the internal structure of the manhole cover installation auxiliary frame of the present invention;

[0034] Figure 5 This is a cross-sectional view of the internal structure of the drainage groove of the present invention;

[0035] Figure 6 This is a perspective view showing the positional relationship between the stainless steel manhole cover and the connecting plate of the present invention.

[0036] In the diagram: 1. Manhole cover installation auxiliary frame; 2. Stainless steel manhole cover; 3. Pulling groove; 4. First rotating groove; 5. First connecting support frame; 6. First rotating connecting shaft; 7. Artistic engraving plate; 8. Drainage groove; 9. Restriction ring; 10. Second rotating groove; 11. Second connecting support frame; 12. Second rotating connecting shaft; 13. Telescopic rod; 14. Third connecting support frame; 15. Third rotating connecting shaft; 16. Push spring; 17. Connecting frame; 18. Item drop restriction frame; 19. Item final storage groove; 20. First item restriction strip; 21. Second item restriction strip; 22. Third item restriction strip; 23. First anti-clogging groove; 24. Second anti-clogging groove; 25. Connecting plate; 26. Item temporary storage groove; 27. Fourth item restriction strip. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] For a further understanding of the contents of this invention, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 This embodiment provides the following technical solution:

[0039] A stainless steel recessed invisible art manhole cover includes a manhole cover installation auxiliary frame 1. A limiting ring 9 is provided on one side inside the manhole cover installation auxiliary frame 1. A stainless steel manhole cover 2 is provided on the upper end of the limiting ring 9. The lower end of the stainless steel manhole cover 2 is connected to the upper end of the limiting ring 9 by a slot. A pulling groove 3 is provided on one side of the upper end of the stainless steel manhole cover 2. The pulling groove 3 is embedded in the interior of the stainless steel manhole cover 2. An art engraving plate 7 is provided on one side of the pulling groove 3. The art engraving plate 7 and the stainless steel manhole cover 2 are an integral structure.

[0040] It also includes a telescopic rod 13, which is set on both sides of the lower end of the stainless steel manhole cover 2. A push spring 16 is set on one side of the telescopic rod 13. A third rotating connecting shaft 15 is set on one end of the telescopic rod 13. The two ends of the push spring 16 are respectively bonded and fixed to the third rotating connecting shaft 15 and the telescopic rod 13. A third connecting support frame 14 is set on both ends of the third rotating connecting shaft 15. One end of the third connecting support frame 14 is welded and fixed to the stainless steel manhole cover 2. Both ends of the third rotating connecting shaft 15 are rotatably connected to the other side of the third connecting support frame 14. The outer side of the third rotating connecting shaft 15 is welded and fixed to one end of the telescopic rod 13. A first rotating groove 4 is set on one side of the upper end of the manhole cover installation auxiliary frame 1. A first connecting support frame 5 is set between the first rotating groove 4 and the stainless steel manhole cover 2. The first connecting support frame 5 and the first rotating groove 4 are rotatably connected by a first rotating connecting shaft 6. One end of the first connecting support frame 5 is welded and fixed to one side of the stainless steel manhole cover 2.

[0041] To address the technical issue that opening existing sunken manhole covers requires the user to bear the full weight of the cover, affecting opening efficiency and stability after opening, please refer to [the relevant documentation / reference]. Figure 1 , Figure 2 and Figure 4 This embodiment provides the following technical solution:

[0042] A pair of second rotating grooves 10 are provided on one side of the outer side of the limiting ring 9. Both second rotating grooves 10 penetrate and extend to the upper and lower ends of the limiting ring 9. A pair of second connecting support frames 11 are provided on one side of the outer side of the two limiting rings 9. A second rotating connecting shaft 12 is provided between the two second connecting support frames 11. Both ends of the outer side of the second rotating connecting shaft 12 are rotatably connected to one side of the second connecting support frame 11. One side of the outer side of the second rotating connecting shaft 12 is welded and fixed to the other end of the telescopic rod 13.

[0043] Specifically, by varying the center of rotation, the stainless steel manhole cover 2 is assisted in its rotation by the extension and retraction of the telescopic rod 13 and the pushing of the spring 16. This assists in the opening of the stainless steel manhole cover 2, making the opening and closing of the stainless steel manhole cover 2 easier and more stable.

[0044] For further details, please refer to Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 This embodiment provides the following technical solution:

[0045] The stainless steel manhole cover 2 has four drainage grooves 8 arranged in a central ring inside, and the drainage grooves 8 penetrate and extend to the upper and lower ends of the stainless steel manhole cover 2. The upper end of each of the four drainage grooves 8 is provided with a first item restriction strip 20, the lower end of the first item restriction strip 20 is provided with a second item restriction strip 21, and the lower end of the second item restriction strip 21 is provided with a third item restriction strip 22. The exterior of the third item restriction strip 22, the second item restriction strip 21 and the first item restriction strip 20 are all welded and fixed to the interior of the drainage groove 8.

[0046] Specifically, the first item restriction bar 20, the second item restriction bar 21, and the third item restriction bar 22, which are distributed in a cross pattern, can block large foreign objects in the liquid without restricting the flow of water. At the same time, the cross pattern can initially restrict foreign objects that are accidentally dropped by people, making it easier for users to manually retrieve the dropped items.

[0047] For further details, please refer to Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 This embodiment provides the following technical solution:

[0048] The upper end of the first item restriction strip 20 is provided with a first anti-clogging groove 23, and the lower end of the first anti-clogging groove 23 is provided with a second anti-clogging groove 24. Both the second anti-clogging groove 24 and the first anti-clogging groove 23 penetrate and extend into the interior of the first item restriction strip 20.

[0049] Specifically, the recessed first anti-clogging groove 23 and second anti-clogging groove 24 can prevent foreign objects adhering to the upper end of the drainage groove 8 from forming a large area of ​​adhesion between the drainage groove 8 and the drainage groove 8, thus avoiding blockage of the water outlet due to foreign object adhesion.

[0050] For further details, please refer to Figure 2 , Figure 3 , Figure 4 and Figure 6 This embodiment provides the following technical solution:

[0051] A connecting frame 17 is provided at each of the four corners of the lower end of the stainless steel manhole cover 2. The four connecting frames 17 are welded and fixed together by a connecting plate 25. A temporary storage groove 26 for items is provided at the upper end of the outer side of the connecting plate 25. The temporary storage groove 26 for items passes through and extends to the upper and lower ends of the connecting plate 25. A fourth item restriction strip 27 is provided inside the connecting plate 25. The fourth item restriction strip 27 is welded and fixed to the connecting plate 25. An item drop restriction frame 18 is provided on one side of the connecting plate 25. An item final storage groove 19 for items is provided inside the item drop restriction frame 18. The item final storage groove 19 is embedded inside the item drop restriction frame 18. The upper end of the item drop restriction frame 18 is welded and fixed to the lower end of the stainless steel manhole cover 2.

[0052] Specifically, the fourth item restriction bar 27 can ultimately restrict the items that are about to fall. At the same time, when the stainless steel manhole cover 2 rotates and unfolds around the first connecting support frame 5, it will guide the items that are about to fall into the final storage groove 19 inside the item drop restriction frame 18, making it easier for the user to retrieve the dropped items.

[0053] To better demonstrate the production process of stainless steel recessed concealed artistic manhole covers, this embodiment proposes a production process for stainless steel recessed concealed artistic manhole covers, including the following steps:

[0054] Step 1: Make the upper and lower halves of the corresponding manhole cover mold according to the customization requirements, place the upper and lower halves of the mold separately, pour sand on the outside of the two molds, and then pour adhesive on the outside of the sand.

[0055] Step 2: Place the sand with adhesive on it and the upper and lower halves of the corresponding manhole cover mold into a drying device for drying.

[0056] Step 3: Hold and rotate one of the two dried items. Then move the other dried item to the bottom of the previously rotated dried item, so that the corresponding surfaces of the two dried items are parallel. After applying adhesive to the surface of the bottom dried item, move the two dried items relative to each other and make them contact. After air drying, they will form a complete mold.

[0057] Step 4: Heat the stainless steel material while adding magnesium, silicon, and graphite during the heating process;

[0058] Step 5: Flow the heated molten metal into the corresponding complete mold made in Step 3, and add silicon again during the flow process;

[0059] Step 6: After adding and cooling, the mold and the solidified contents inside are conveyed together to the demolding device for demolding.

[0060] Step 7: Grind and cut the coated stainless steel item to achieve the required dimensions;

[0061] Step 8: Simulate the pressure of various usage environments to test the polished and cut stainless steel manhole covers;

[0062] Step 9: Apply asphalt paint to the stainless steel manhole cover, and engrave and further process the required pictures, text and recess dimensions on the art engraving plate 7 on the surface of the stainless steel manhole cover 2;

[0063] Step 10: Test the artistic stainless steel manhole cover again. Once the test is passed, the processing is considered complete.

[0064] For further details, please refer to Figure 1 This embodiment provides the following technical solution:

[0065] In step one, the mass of the sand covering the upper and lower halves of the manhole cover mold is 300 kilograms.

[0066] Specifically, stainless steel manhole covers can be manufactured and processed by wrapping them with sand.

[0067] For further details, please refer to Figure 1 This embodiment provides the following technical solution:

[0068] The drying temperature in step two is 50 to 80 degrees Celsius, and the drying time in step two is 20 minutes.

[0069] Specifically, drying allows the sand to solidify and wrap around the mold, facilitating subsequent irrigation and shaping.

[0070] For further details, please refer to Figure 1 This embodiment provides the following technical solution:

[0071] In step three, one of the items being dried is rotated 180 degrees.

[0072] Specifically, by reversing the mold by 180 degrees, the upper and lower parts of the corresponding manhole cover mold can be placed opposite each other and fitted together to form a complete mold.

[0073] For further details, please refer to Figure 1 This embodiment provides the following technical solution:

[0074] In step four, the stainless steel material, as well as the added magnesium, silicon, and graphite, are heated to 1,500 degrees Celsius.

[0075] Specifically, the strength and toughness of stainless steel can be effectively improved by adding magnesium, silicon, and graphite.

[0076] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0077] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stainless steel recessed invisible art manhole cover, comprising a manhole cover installation auxiliary frame (1), wherein a limiting ring (9) is provided on one side inside the manhole cover installation auxiliary frame (1), a stainless steel manhole cover (2) is provided on the upper end of the limiting ring (9), and the lower end of the stainless steel manhole cover (2) is connected to the upper end of the limiting ring (9) by a slot, a pulling groove (3) is provided on one side of the upper end of the stainless steel manhole cover (2), and the pulling groove (3) is embedded in the interior of the stainless steel manhole cover (2), and an art engraving plate (7) is provided on one side of the pulling groove (3), and the art engraving plate (7) and the stainless steel manhole cover (2) are an integral structure, characterized in that ； It also includes a telescopic rod (13), which is set on both sides of the lower end of the stainless steel manhole cover (2). A push spring (16) is set on one side of the telescopic rod (13). A third rotating connecting shaft (15) is set at one end of the telescopic rod (13). The two ends of the push spring (16) are respectively bonded and fixed to the third rotating connecting shaft (15) and the telescopic rod (13). A third connecting support frame (14) is set at both ends of the third rotating connecting shaft (15), and one end of the third connecting support frame (14) is... The stainless steel manhole cover (2) is welded and fixed. Both ends of the third rotating connecting shaft (15) are rotatably connected to the other side of the third connecting support frame (14). One side of the outer side of the third rotating connecting shaft (15) is welded and fixed to one end of the telescopic rod (13). A first rotating groove (4) is provided on one side of the upper end of the manhole cover installation auxiliary frame (1). A first connecting support frame (5) is provided between the first rotating groove (4) and the stainless steel manhole cover (2). The first connecting support frame (5) and the first rotating groove (4) are rotatably connected by a first rotating connecting shaft (6). One end of the first connecting support frame (5) is welded and fixed to one side of the stainless steel manhole cover (2). Four drainage grooves (8) are provided in a ring shape in the middle of the inside of the stainless steel manhole cover (2). A first item restriction strip (20) is provided at the upper end of each of the four drainage grooves (8). A second item restriction strip (21) is provided at the lower end of the first item restriction strip (20). A third item restriction strip (22) is provided at the lower end of the second item restriction strip (21). The upper end of the first item restriction strip (20) is provided with a first anti-blocking groove (23), the lower end of the first anti-blocking groove (23) is provided with a second anti-blocking groove (24), the four corners of the lower end of the stainless steel manhole cover (2) are provided with connecting frames (17), the four connecting frames (17) are welded and fixed together by connecting plates (25), one side of the connecting plate (25) is provided with an item drop restriction frame (18), and the inside of the connecting plate (25) is provided with a fourth item restriction strip (27).

2. The stainless steel recessed concealed artistic manhole cover according to claim 1, characterized in that: A pair of second rotating grooves (10) are provided on one side of the outer side of the limiting ring (9). Both second rotating grooves (10) penetrate and extend to the upper and lower ends of the limiting ring (9). A pair of second connecting support frames (11) are provided on one side of the outer side of the two limiting rings (9). A second rotating connecting shaft (12) is provided between the two second connecting support frames (11). Both ends of the outer side of the second rotating connecting shaft (12) are rotatably connected to one side of the second connecting support frame (11). One side of the outer side of the second rotating connecting shaft (12) is welded and fixed to the other end of the telescopic rod (13).

3. A stainless steel recessed concealed artistic manhole cover according to claim 2, characterized in that: The drainage groove (8) runs through and extends to the upper and lower ends of the stainless steel manhole cover (2), and the exterior of the third article restriction strip (22), the second article restriction strip (21) and the first article restriction strip (20) are all welded and fixed to the interior of the drainage groove (8).

4. A stainless steel recessed concealed artistic manhole cover according to claim 3, characterized in that: Both the second anti-clogging groove (24) and the first anti-clogging groove (23) penetrate and extend into the interior of the first article restriction strip (20).

5. A stainless steel recessed concealed artistic manhole cover according to claim 4, characterized in that: The upper part of the connecting plate (25) is provided with a temporary storage groove (26) for items, and the temporary storage groove (26) for items passes through and extends to the upper and lower ends of the connecting plate (25). The fourth item restriction strip (27) is welded and fixed to the connecting plate (25). The inside of the item drop restriction frame (18) is provided with a final item storage groove (19), and the final item storage groove (19) for items is embedded in the inside of the item drop restriction frame (18). The upper end of the item drop restriction frame (18) is welded and fixed to the lower end of the stainless steel manhole cover (2).

6. A manufacturing process for a stainless steel recessed concealed artistic manhole cover according to claim 5, characterized in that: Includes the following steps: Step 1: Make the upper and lower halves of the corresponding manhole cover mold according to the customization requirements, place the upper and lower halves of the mold separately, pour sand on the outside of the two molds, and then pour adhesive on the outside of the sand. Step 2: Place the sand with adhesive on it and the upper and lower halves of the corresponding manhole cover mold into a drying device for drying. Step 3: Hold and rotate one of the two dried items. Then move the other dried item to the bottom of the previously rotated dried item, so that the corresponding surfaces of the two dried items are parallel. After applying adhesive to the surface of the bottom dried item, move the two dried items relative to each other and make them contact. After air drying, they will form a complete mold. Step 4: Heat the stainless steel material while adding magnesium, silicon, and graphite during the heating process; Step 5: Flow the heated molten metal into the corresponding complete mold made in Step 3, and add silicon again during the flow process; Step 6: After adding and cooling, the mold and the solidified contents inside are conveyed together to the demolding device for demolding. Step 7: Grind and cut the coated stainless steel item to achieve the required dimensions; Step 8: Simulate the pressure of various usage environments to test the polished and cut stainless steel manhole covers; Step 9: Apply asphalt paint to the stainless steel manhole cover and carve and further process the required pictures, text and recessed dimensions on the art engraving plate (7) on the surface of the stainless steel manhole cover (2); Step 10: Test the artistic stainless steel manhole cover again. Once the test is passed, the processing is considered complete.

7. The manufacturing process of a stainless steel recessed concealed artistic manhole cover according to claim 6, characterized in that: In step one, the mass of the sand covering the upper and lower halves of the manhole cover mold is 300 kilograms.

8. The manufacturing process of a stainless steel recessed concealed artistic manhole cover according to claim 6, characterized in that: The drying temperature in step two is between 50 and 80 degrees Celsius, and the drying time in step two is 20 minutes.

9. The manufacturing process of a stainless steel recessed concealed artistic manhole cover according to claim 6, characterized in that: In step three, one of the items being dried is rotated 180 degrees.

10. The manufacturing process of a stainless steel recessed concealed artistic manhole cover according to claim 6, characterized in that: In step four, the heating temperature for the stainless steel material and the added magnesium, silicon, and graphite is 1,500 degrees Celsius.

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