A double cover ball mill cast iron manhole cover and its installation method

Abstract

This invention discloses a double-cover ductile iron manhole cover and its installation method, belonging to the technical field of ductile iron manhole covers. The double-cover ductile iron manhole cover and its installation method include a manhole cover body and an outer ring for installing the manhole cover body. The manhole cover body includes an upper manhole cover and a lower manhole cover. This invention solves the problems of poor load-bearing capacity of existing manhole covers, the inability to directly support and adjust the double manhole cover, resulting in poor safety, and the inability to automatically lock the manhole cover while it is being pressed down. This invention allows for direct drainage through a circular hole when the lower manhole cover is opened, preventing rainwater from pushing and improving drainage efficiency. The drainage hole can be selected according to the water volume, effectively filtering impurities while draining water, preventing blockage of the inlet hole. The interlocking ring rod improves installation stability, increases the overall load-bearing efficiency of the manhole cover, ensures the practical safety of the manhole cover, effectively achieves automatic locking, improves installation convenience, and enables rapid installation.

Description

Technical Field

[0001] This invention relates to the field of spheroidal cast iron manhole cover technology, specifically to a double-cover spheroidal cast iron manhole cover and its installation method. Background Technology

[0002] Ductile iron manhole covers are a type of ductile iron product. Ductile iron is produced by spheroidizing and inoculating to obtain spheroidal graphite, which effectively improves the mechanical properties of cast iron, especially its plasticity and toughness, resulting in strength higher than that of carbon steel. It is used to cast parts with complex stress and high requirements for strength, toughness, and wear resistance. Ductile iron has rapidly developed into the second most widely used cast iron after gray cast iron. Generally, ductile iron manhole covers are used for drainage and to prevent people from falling in.

[0003] Chinese patent CN214940415U discloses a double-layer composite ductile iron manhole cover. By setting up a protective mechanism, the connecting support rod inside the sturdy frame plays a stabilizing role for the horizontal support rod. When a person falls onto the horizontal elastic rope, the buffer spring begins to stretch on the buffer block, converting the buffering force into elastic potential energy and releasing it slowly, thus playing a double buffering protection role. With multiple protective facilities, it is less likely for people to fall into the well, effectively avoiding injuries caused by people falling into the drainage well, and has better safety and practicality.

[0004] The ductile iron manhole cover described in the above patent has poor load-bearing capacity in actual use, and the double manhole cover cannot be directly supported and adjusted, resulting in poor safety. Secondly, it cannot automatically lock the manhole cover while it is being pressed down, making the installation process complicated and inconvenient. Therefore, it does not meet the current needs. In response, we propose a double-cover ductile iron manhole cover and its installation method. Summary of the Invention

[0005] The purpose of this invention is to provide a double-cover ductile iron manhole cover and its installation method. By setting up support components, the support efficiency between the two manhole covers is improved, as well as the overall load-bearing efficiency, thus increasing practical safety. The lower manhole cover can be opened to allow direct drainage through a circular hole, preventing rainwater from pushing and improving drainage efficiency. The drainage slots can be selected according to the water volume requirements, effectively filtering impurities while draining water, preventing blockage of the inlet hole. The filter screen is installed with hooks for easy removal and treatment of filtered impurities. The ring rod is inserted to improve installation stability, increase the overall load-bearing efficiency of the manhole cover, ensure the practical safety of the manhole cover, and effectively perform automatic locking, improving installation convenience and enabling rapid installation. This solves the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a double-cover spheroidal cast iron manhole cover, comprising a manhole cover body and a manhole cover outer ring for installing the manhole cover body, wherein the manhole cover body comprises an upper manhole cover and a lower manhole cover, and the upper manhole cover and the lower manhole cover are connected by a support and adjustment assembly;

[0007] The support adjustment assembly includes an outer mounting ring plate, a support member, a rotating assembly, and a filter assembly. The outer mounting ring plate has an installation groove, and a lower manhole cover is installed at the bottom of the installation groove. Rotating assembly components are installed at both ends of the lower manhole cover. The upper manhole cover is fitted onto the rotating assembly. A support member is installed at the center of the upper and lower manhole covers. An insertion assembly that mates with the outer ring of the manhole cover is installed inside the lower manhole cover. An automatic locking assembly is installed between the manhole cover body and the outer ring of the manhole cover.

[0008] Preferably, a retaining ring is provided at the bottom of the outer ring of the manhole cover, a pre-embedded ring seat is provided on the outer ring of the outer ring of the manhole cover, an inclined triangular support plate is directly provided between the retaining ring and the pre-embedded ring seat, and a locking groove for accommodating the automatic locking assembly is provided on the inner wall of the outer ring of the manhole cover.

[0009] Preferably, the support includes a fixed ring plate, a tapered support bracket, an inner ring, a top plate, a telescopic tube, and a lifting column. The inner ring is sleeved inside the fixed ring plate, and the upper end of the inner ring is connected to the tapered support bracket. The upper end of the tapered support bracket is connected to the top plate. Telescopic tubes are provided at the four corners of the outer side of the fixed ring plate. The lifting column is sleeved inside the telescopic tube, and the top end of the lifting column is in contact with the top plate.

[0010] Preferably, the rotating assembly includes a rotary motor, a lead screw, a guide rod, and a movable ring. The rotary motor is fixed on the lower manhole cover, and the output end of the rotary motor is connected to the lead screw. The movable ring is sleeved on the lead screw, and the upper end of the movable ring is fixed on the inner wall below the upper manhole cover. The guide rod is fixed on the lower manhole cover, and the upper manhole cover has an insertion hole corresponding to the guide rod.

[0011] Preferably, the filter assembly includes an upper connecting hook and a filter screen. Multiple upper connecting hooks are provided, all of which are fixed in a ring on the upper end surface of the lower manhole cover. The outer side hook of the filter screen is provided on the upper connecting hook. Two drainage holes are opened on the upper manhole cover, and a circular hole is opened at the center of the lower manhole cover.

[0012] Preferably, the mating assembly includes a lateral motor, a large bevel gear, a small bevel gear, an inner connector, and a connector rod. The lateral motor is fixed to the inner wall of the lower manhole cover, and the output end of the lateral motor is connected to the small bevel gear. The lower manhole cover has an inner groove to accommodate the large bevel gear. The upper end of the large bevel gear is connected to the upper inner wall of the lower manhole cover through a bearing. The large bevel gear meshes with the small bevel gear. An inner connector is provided on the upper surface of the large bevel gear. One end of the inner connector is connected to the connector rod. The outer mounting ring plate and the lower manhole cover have sliding grooves for the inner connector to slide.

[0013] Preferably, the upper end face of the large bevel gear is provided with a spiral groove, the lower end face of the inner connecting seat is provided with a tooth groove that meshes with the spiral groove, the inner connecting seat and the plug rod are both provided with five, and the inner wall of the outer ring of the manhole cover is provided with a plug hole corresponding to the plug rod.

[0014] Preferably, the automatic locking assembly includes a locking block, a snap-fit ​​bracket, a drive shaft, a pressure block, a lower plate, a linkage gear, and a linkage shaft. The locking block is fixed on the outer wall of the outer mounting ring plate. The two ends of the snap-fit ​​bracket are sleeved on the drive shaft. The two ends of the drive shaft are set in the locking groove. The lower plate is connected below the pressure block. One end of the lower plate is provided with a tooth groove that meshes with the linkage gear. The linkage gear is sleeved on the linkage shaft. Linkage ropes are wound and fixed at both ends of the linkage shaft. The other end of the linkage ropes is wound and fixed on the drive shaft. A snap-fit ​​groove that engages with the snap-fit ​​bracket is opened on the top of the locking block.

[0015] The locking groove has an inner groove below it to accommodate the lower plate, and the locking groove is connected to the pressure block by a spring.

[0016] An installation method for a double-cover ductile iron manhole cover includes the following steps:

[0017] Step 1: When the manhole cover body is installed, the upper manhole cover is pressed down, and the top plate engages with the upper manhole cover, supported by the conical support bracket, telescopic pipe, and lifting column;

[0018] Step 2: Align the outer mounting ring plate of the upper manhole cover with the outer ring of the manhole cover, place the outer mounting ring plate on the retaining ring, and place the locking block into the locking groove during placement;

[0019] Step 3: The locking block presses against the pressure block in the locking groove. As the pressure block moves down, it also moves the lower plate down, thereby driving the linkage gear to rotate, which in turn drives the linkage shaft to rotate. Through the linkage rope, the drive shaft rotates, which in turn drives the locking bracket to rotate and lock into the slot in the locking block.

[0020] Preferably, in step one, when the upper manhole cover is installed, water is drained through two drainage holes, filtered through a filter screen to remove impurities, and the filtered water is discharged through a circular hole.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. This invention features a conical support bracket connected to the upper end of an inner ring, with a top plate connected to the upper end of the conical support bracket. Telescopic tubes are installed at the four corners of the outer side of the fixed ring plate, and lifting columns are fitted inside the telescopic tubes. The top of the lifting columns fits into the top plate. When the manhole cover is installed, the upper manhole cover is pressed down, and the top plate engages with the upper manhole cover. The conical support bracket, telescopic tubes, and lifting columns provide support. The lifting columns extend and retract within the telescopic tubes to adjust the support force. By setting up support components, the support efficiency between the two manhole covers is improved, as is the overall load-bearing efficiency, thus increasing practical safety.

[0023] 2. This invention involves fixing the upper end of a movable ring to the inner wall below the upper manhole cover, fixing a guide rod to the lower manhole cover, and providing an insertion hole on the upper manhole cover corresponding to the guide rod. A rotary motor drives a lead screw to rotate, thereby moving the upper manhole cover upward. As the lead screw and guide rod move upward, when the upper manhole cover separates from the guide rod, the lead screw drives the upper manhole cover to rotate, opening the lower manhole cover and allowing direct drainage through a circular hole. This prevents rainwater from being pushed out and improves drainage efficiency. The drainage hole can be selected according to the water volume requirements.

[0024] 3. This invention features a hook on the outer side of the filter screen mounted on the upper hook. The upper manhole cover has two drainage holes, and the lower manhole cover has a circular hole in the center. When the upper manhole cover is installed, water is drained through the two drainage holes and then filtered through the filter screen to remove impurities. The filtered water is then discharged through the circular hole, effectively filtering impurities while draining water, preventing the inlet hole from becoming clogged. The filter screen is also installed with hooks for easy removal and treatment of the filtered impurities.

[0025] 4. This invention features a sliding groove for the inner connecting seat to slide within the outer mounting ring plate and the lower manhole cover. A spiral groove is formed on the upper surface of the large bevel gear, and a toothed groove that meshes with the spiral groove is formed on the lower surface of the inner connecting seat. Five inner connecting seats and five connecting rods are provided. An insertion hole corresponding to the connecting rod is formed on the inner wall of the outer ring of the manhole cover. A lateral motor drives the small bevel gear to rotate, which in turn drives the large bevel gear to rotate. During rotation, the spiral groove causes the inner connecting seat to slide along the sliding groove, thereby moving the connecting rod and inserting it into the insertion hole on the inner wall of the outer ring of the manhole cover. This ring-shaped rod insertion improves installation stability, increases the overall load-bearing efficiency of the manhole cover, and ensures the practical safety of the manhole cover.

[0026] 5. This invention features a linkage rope wound and fixed at both ends of a linkage shaft, with the other end of the rope wound and fixed to a drive shaft. A locking slot is provided above the locking block to engage with a locking bracket, and an inner groove is provided below the locking slot to accommodate a lower plate. A spring connects the locking slot to a pressure block, which compresses the pressure block within the locking slot. As the pressure block moves downward, the lower plate moves downward, causing the linkage gear to rotate, which in turn rotates the linkage shaft. The linkage rope then drives the drive shaft to rotate, causing the locking bracket to rotate and engage with the locking slot within the locking block. This effectively achieves automatic locking, improves installation convenience, and enables rapid installation. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is an exploded view of the overall structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the support adjustment component structure of the present invention;

[0030] Figure 4 This is a schematic diagram of the support structure of the present invention;

[0031] Figure 5 This is a schematic diagram of the rotating component structure of the present invention;

[0032] Figure 6 This is a cross-sectional view of the filter assembly structure of the present invention;

[0033] Figure 7 This is a cross-sectional view of the interlocking assembly structure of the present invention;

[0034] Figure 8 This is a structural exploded view of the automatic locking assembly of the present invention.

[0035] In the diagram: 1. Manhole cover body; 11. Upper manhole cover; 111. Drainage hole; 12. Lower manhole cover; 121. Circular hole; 2. Outer ring of manhole cover; 21. Clamping ring; 211. Inclined triangular support plate; 22. Embedded ring seat; 23. Locking groove; 3. Support and adjustment assembly; 31. Outer mounting ring plate; 311. Mounting groove; 32. Support component; 321. Fixed ring plate; 322. Conical support bracket; 323. Inner connecting ring; 324. Top connecting plate; 325. Telescopic pipe; 326. Lifting column; 33. Rotating assembly 331. Rotary motor; 332. Lead screw; 333. Guide rod; 334. Moving ring; 34. Filter assembly; 341. Upper connecting hook; 342. Filter screen; 4. Insertion assembly; 41. Side motor; 42. Large bevel gear; 421. Spiral groove; 43. Small bevel gear; 44. Inner connecting seat; 45. Insertion rod; 5. Automatic locking assembly; 51. Locking block; 52. Snap-fit ​​bracket; 53. Drive shaft; 54. Pressure block; 55. Lower connecting plate; 56. Linkage gear; 57. Linkage shaft. Detailed Implementation

[0036] 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.

[0037] To address the issues of poor load-bearing capacity of existing manhole covers and the inability to adjust the support of double manhole covers, leading to poor safety during use, please refer to [link to relevant documentation]. Figures 1-3 This embodiment provides the following technical solution:

[0038] A double-cover spherical cast iron manhole cover includes a manhole cover body 1 and a manhole cover outer ring 2 for installing the manhole cover body 1. The manhole cover body 1 includes an upper manhole cover 11 and a lower manhole cover 12, which are connected by a support and adjustment assembly 3. An insertion assembly 4 that connects with the manhole cover outer ring 2 is provided inside the lower manhole cover 12. An automatic locking assembly 5 is provided between the manhole cover body 1 and the manhole cover outer ring 2. A retaining ring 21 is provided at the bottom of the manhole cover outer ring 2. A pre-embedded ring seat 22 is provided on the outer ring of the manhole cover outer ring 2. An inclined triangular support plate 211 is directly provided between the retaining ring 21 and the pre-embedded ring seat 22. A locking groove 23 for accommodating the automatic locking assembly 5 is provided on the inner wall of the manhole cover outer ring 2.

[0039] Please see Figure 4The support adjustment assembly 3 includes an outer mounting ring plate 31, a support member 32, a rotating assembly 33, and a filter assembly 34. The outer mounting ring plate 31 has a mounting groove 311. A lower manhole cover 12 is installed at the bottom of the mounting groove 311. Rotating assembly 33 components are installed at both ends of the lower manhole cover 12. The upper manhole cover 11 is sleeved on the rotating assembly 33. A support member 32 is located at the center of the upper manhole cover 11 and the lower manhole cover 12. The support member 32 includes a fixed ring plate 321, a conical support bracket 322, an inner ring 323, a top plate 324, a telescopic tube 325, and a lifting column 326. The inner ring 323 is sleeved inside the fixed ring plate 321, and the upper end of the inner ring 323 is connected to… A tapered support bracket 322 is connected to the upper end of the tapered support bracket 322, which is connected to the top plate 324. Telescopic tubes 325 are set at the four corners of the outer side of the fixing ring plate 321. The inside of the telescopic tube 325 is covered with a lifting column 326. The top of the lifting column 326 is in contact with the top plate 324. When the manhole cover body 1 is installed, the upper manhole cover 11 is pressed down, and the top plate 324 is engaged with the upper manhole cover 11. It is supported by the tapered support bracket 322, the telescopic tube 325, and the lifting column 326. The supporting force is adjusted by the telescopic extension and retraction of the lifting column 326 within the telescopic tube 325. The support efficiency between the two manhole covers is improved by setting the support component 32, which also improves the overall load-bearing efficiency and increases practical safety.

[0040] Please see Figure 5 The rotating assembly 33 includes a rotating motor 331, a lead screw 332, a guide rod 333, and a moving ring 334. The rotating motor 331 is fixed on the lower manhole cover 12, and the output end of the rotating motor 331 is connected to the lead screw 332. The moving ring 334 is sleeved on the lead screw 332, and the upper end of the moving ring 334 is fixed on the inner wall below the upper manhole cover 11. The guide rod 333 is fixed on the lower manhole cover 12, and the upper manhole cover 11 has an insertion hole corresponding to the guide rod 333. The rotating motor 331 drives the lead screw 332 to rotate, thereby driving the upper manhole cover 11 to move upward. When the lead screw 332 and the guide rod 333 move upward and the upper manhole cover 11 separates from the guide rod 333, the lead screw 332 drives the upper manhole cover 11 to rotate, opening the lower manhole cover 12, allowing direct drainage through the circular hole 121 to prevent rainwater from pushing and improve drainage efficiency. The drainage hole can be selected according to the water volume requirements.

[0041] Please see Figure 6The filter assembly 34 includes an upper connecting hook 341 and a filter screen 342. Multiple upper connecting hooks 341 are provided, all of which are fixed in a ring on the upper end face of the lower manhole cover 12. The outer side of the filter screen 342 is hooked on the upper connecting hook 341. The upper manhole cover 11 has two drainage holes 111, and the lower manhole cover 12 has a circular hole 121 at the center. When the upper manhole cover 11 is installed, water is drained through the two drainage holes 111 and filtered through the filter screen 342 to remove impurities. The filtered water is discharged through the circular hole 121, effectively filtering impurities while draining water, preventing the water inlet from being blocked. The filter screen 342 is installed with hooks, making it easy to remove and treat the filtered impurities.

[0042] Please see Figure 7 The mating assembly 4 includes a lateral motor 41, a large bevel gear 42, a small bevel gear 43, an inner connector 44, and a connector rod 45. The lateral motor 41 is fixed to the inner wall of the lower manhole cover 12. The output end of the lateral motor 41 is connected to the small bevel gear 43. The lower manhole cover 12 has an inner groove to accommodate the large bevel gear 42. The upper end of the large bevel gear 42 is connected to the upper inner wall of the lower manhole cover 12 through a bearing. The large bevel gear 42 meshes with the small bevel gear 43. An inner connector 44 is provided on the upper end surface of the large bevel gear 42. One end of the inner connector 44 is connected to the connector rod 45. The outer mounting ring plate 31 and the lower manhole cover 12 have openings for the sliding of the inner connector 44. The upper end face of the large bevel gear 42 has a spiral groove 421, and the lower end face of the inner connecting seat 44 has a tooth groove that meshes with the spiral groove 421. There are five inner connecting seats 44 and five plug rods 45. The inner wall of the outer ring 2 of the manhole cover has a plugging hole corresponding to the plug rod 45. The lateral motor 41 drives the small bevel gear 43 to rotate, thereby driving the large bevel gear 42 to rotate. During rotation, the spiral groove 421 drives the inner connecting seat 44 to slide along the slide, thereby driving the plug rod 45 to move and insert into the plugging hole in the inner wall of the outer ring 2 of the manhole cover. The ring rod is plugged in, which improves the installation stability, increases the load-bearing efficiency of the entire manhole cover, and ensures the practical safety of the manhole cover.

[0043] To address the issue of existing manhole covers failing to automatically lock themselves in place while being pressed down, resulting in a cumbersome and inconvenient installation process, please refer to [link / reference needed]. Figure 8 This embodiment provides the following technical solution:

[0044] The automatic locking assembly 5 includes a locking block 51, a snap-fit ​​bracket 52, a drive shaft 53, a pressure block 54, a lower connecting plate 55, a linkage gear 56, and a linkage shaft 57. The locking block 51 is fixed to the outer wall of the outer mounting ring plate 31. The two ends of the snap-fit ​​bracket 52 are sleeved on the drive shaft 53, and the two ends of the drive shaft 53 are set in the locking groove 23. The lower connecting plate 55 is connected below the pressure block 54. One end of the lower connecting plate 55 is provided with a tooth groove that meshes with the linkage gear 56. The linkage gear 56 is sleeved on the linkage shaft 57. A linkage rope is wound and fixed at both ends of the linkage shaft 57, and the other end of the linkage rope is wound and fixed to the drive shaft 57. 3. The upper part of the locking block 51 has a slot that engages with the locking bracket 52. The lower part of the locking groove 23 has an inner groove that accommodates the lower plate 55. The locking groove 23 is connected to the pressure block 54 by a spring. The locking block 51 presses the pressure block 54 in the locking groove 23. As the pressure block 54 moves down, it drives the lower plate 55 to move down, thereby driving the linkage gear 56 to rotate, which in turn drives the linkage shaft 57 to rotate. Through the linkage rope, the drive shaft 53 rotates, which in turn drives the locking bracket 52 to rotate and engage with the slot in the locking block 51, effectively achieving automatic locking, improving installation convenience, and realizing rapid installation.

[0045] Specifically, this invention demonstrates an installation method for double-cover spheroidal cast iron manhole covers, including:

[0046] When the manhole cover body 1 is installed, the upper manhole cover 11 is pressed down, and the top plate 324 engages with the upper manhole cover 11, supported by the conical support bracket 322, the telescopic pipe 325, and the lifting column 326. The outer mounting ring plate 31 of the upper manhole cover 11 is aligned with the outer ring 2 of the manhole cover, and the outer mounting ring plate 31 is placed on the retaining ring 21. During placement, the locking block 51 is placed in the locking groove 23. The locking block 51 squeezes the pressure block 54 in the locking groove 23. As the pressure block 54 moves down, it drives the lower plate 55 to move down, thereby driving the linkage gear 56 to rotate, thereby driving the linkage shaft 57 to rotate. Through the linkage rope, the drive shaft 53 is driven to rotate, thereby driving the retaining bracket 52 to rotate and engage in the retaining groove in the locking block 51.

[0047] Working principle: When using double-cover spherical cast iron manhole covers, according to... Figure 1 , Figure 2 and Figure 3 When the manhole cover body 1 is installed, the upper manhole cover 11 is pressed down, and the top plate 324 engages with the upper manhole cover 11. It is supported by the conical support bracket 322, the telescopic pipe 325, and the lifting column 326. Figure 4 When the manhole cover body 1 is installed, the upper manhole cover 11 is pressed down, and the top plate 324 engages with the upper manhole cover 11. It is supported by the conical support bracket 322, the telescopic pipe 325, and the lifting column 326. The supporting force is adjusted by the extension and retraction of the lifting column 326 within the telescopic pipe 325. Figure 5The rotary motor 331 drives the lead screw 332 to rotate, thereby moving the upper manhole cover 11 upward. As the lead screw 332 and guide rod 333 move upward, and the upper manhole cover 11 separates from the guide rod 333, the lead screw 332 drives the upper manhole cover 11 to rotate, opening the lower manhole cover 12 for direct drainage through the circular hole 121. Figure 6 When the upper manhole cover 11 is installed, water is drained through two drainage holes 111, and then filtered through a filter screen 342 to remove impurities. Figure 7 The lateral motor 41 drives the small bevel gear 43 to rotate, which in turn drives the large bevel gear 42 to rotate. During rotation, the spiral groove 421 drives the inner connecting seat 44 to slide along the slide groove, thereby driving the insertion rod 45 to move and insert into the insertion hole on the inner wall of the outer ring 2 of the manhole cover. Figure 8 The locking block 51 presses the pressure block 54 in the locking groove 23. As the pressure block 54 moves down, it drives the lower plate 55 to move down, thereby driving the linkage gear 56 to rotate, which in turn drives the linkage shaft 57 to rotate. Through the linkage rope, the drive shaft 53 rotates, thereby driving the locking bracket 52 to rotate and lock into the slot in the locking block 51, effectively performing automatic locking.

[0048] 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.

[0049] 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 double-cover ductile iron manhole cover, comprising a manhole cover body (1) and a manhole cover outer ring (2) for installing the manhole cover body (1), characterized in that, The manhole cover body (1) includes an upper manhole cover (11) and a lower manhole cover (12), which are connected by a support and adjustment assembly (3); The support adjustment assembly (3) includes an outer mounting ring plate (31), a support member (32), a rotating assembly (33), and a filter assembly (34). An installation groove (311) is provided in the outer mounting ring plate (31). A lower manhole cover (12) is installed at the bottom of the installation groove (311). Rotating assemblies (33) are provided at both ends of the lower manhole cover (12). The upper manhole cover (11) is fitted onto the rotating assembly (33). A support member (32) is provided at the center of the upper manhole cover (11) and the lower manhole cover (12). A mating assembly (4) is provided inside the lower manhole cover (12) to engage with the outer ring (2). An automatic locking assembly (5) is provided between the manhole cover body (1) and the outer ring (2). The mating assembly (4) includes a lateral... The system includes a motor (41), a large bevel gear (42), a small bevel gear (43), an inner mounting bracket (44), and a connecting rod (45). The lateral motor (41) is fixed to the inner wall of the lower manhole cover (12). The output end of the lateral motor (41) is connected to the small bevel gear (43). The lower manhole cover (12) has an inner groove for accommodating the large bevel gear (42). The upper end of the large bevel gear (42) is connected to the upper inner wall of the lower manhole cover (12) through a bearing. The large bevel gear (42) meshes with the small bevel gear (43). An inner mounting bracket (44) is provided on the upper surface of the large bevel gear (42). One end of the inner mounting bracket (44) is connected to the connecting rod (45). The outer mounting ring plate (31) and the lower manhole cover (12) have sliding grooves for the inner mounting bracket (44) to slide. The upper end face of the large bevel gear (42) is provided with a spiral groove (421), and the lower end face of the inner connecting seat (44) is provided with a tooth groove that meshes with the spiral groove (421). The inner connecting seat (44) and the plug rod (45) are each provided with five. The inner wall of the manhole cover outer ring (2) is provided with a plug hole corresponding to the plug rod (45). The bottom end of the manhole cover outer ring (2) is provided with a retaining ring (21). The outer ring of the manhole cover outer ring (2) is provided with a pre-embedded ring seat (22). An inclined triangular support plate (211) is provided between the retaining ring (21) and the pre-embedded ring seat (22). The inner wall of the manhole cover outer ring (2) is provided with a locking groove (23) for accommodating the automatic locking assembly (5). The automatic locking assembly (5) includes a locking block (51) and a retaining bracket (521). 2) Drive shaft (53), pressure block (54), lower connecting plate (55), linkage gear (56) and linkage shaft (57), locking block (51) is fixed on the outer wall of outer mounting ring plate (31), the two ends of the snap-fit ​​bracket (52) are sleeved on the drive shaft (53), the two ends of the drive shaft (53) are set in the locking groove (23), the lower connecting plate (55) is connected below the pressure block (54), one end of the lower connecting plate (55) is provided with a tooth groove that meshes with the linkage gear (56), the linkage gear (56) is sleeved on the linkage shaft (57), the two ends of the linkage shaft (57) are fixed with linkage ropes, the other end of the linkage ropes are fixed with the drive shaft (53), and the upper part of the locking block (51) is provided with a snap-fit ​​groove that engages with the snap-fit ​​bracket (52).The locking groove (23) has an inner groove below it to accommodate the lower connecting plate (55), and the locking groove (23) is connected to the pressure block (54) by a spring.

2. The double-cover ductile iron manhole cover according to claim 1, characterized in that: The support member (32) includes a fixed ring plate (321), a conical support bracket (322), an inner ring (323), a top plate (324), a telescopic tube (325), and a lifting column (326). The fixed ring plate (321) is fitted with an inner ring (323). The upper end of the inner ring (323) is connected to the conical support bracket (322). The upper end of the conical support bracket (322) is connected to the top plate (324). The four corners of the fixed ring plate (321) are provided with telescopic tubes (325). The inside of the telescopic tubes (325) is fitted with lifting columns (326). The top of the lifting column (326) is in contact with the top plate (324).

3. A double-cover ductile iron manhole cover according to claim 2, characterized in that: The rotating assembly (33) includes a rotating motor (331), a lead screw (332), a guide rod (333), and a moving ring (334). The rotating motor (331) is fixed on the lower manhole cover (12). The output end of the rotating motor (331) is connected to the lead screw (332). The moving ring (334) is sleeved on the lead screw (332). The upper end of the moving ring (334) is fixed on the inner wall below the upper manhole cover (11). The guide rod (333) is fixed on the lower manhole cover (12). The upper manhole cover (11) has a mating hole corresponding to the guide rod (333).

4. A double-cover ductile iron manhole cover according to claim 3, characterized in that: The filter assembly (34) includes an upper connecting hook (341) and a filter screen (342). Multiple upper connecting hooks (341) are provided, all of which are fixed in a ring on the upper end face of the lower manhole cover (12). The outer side hook of the filter screen (342) is set on the upper connecting hook (341). Two drainage holes (111) are opened on the upper manhole cover (11), and a circular hole (121) is opened at the center of the lower manhole cover (12).

5. A method for installing a double-cover ductile iron manhole cover according to claim 4, characterized in that: Includes the following steps: Step 1: When the manhole cover body (1) is installed, the upper manhole cover (11) is pressed down, and the top plate (324) engages with the upper manhole cover (11), supported by the conical support bracket (322), the telescopic pipe (325), and the lifting column (326); Step 2: Align the outer mounting ring plate (31) of the upper manhole cover (11) with the outer ring (2) of the manhole cover, place the outer mounting ring plate (31) on the retaining ring (21), and place the locking block (51) into the locking groove (23) during placement; Step 3: The locking block (51) squeezes the pressure block (54) in the locking groove (23). As the pressure block (54) moves down, it drives the lower plate (55) to move down, thereby driving the linkage gear (56) to rotate, which in turn drives the linkage shaft (57) to rotate. Through the linkage rope, the drive shaft (53) is driven to rotate, thereby driving the snap-fit ​​bracket (52) to rotate and snap into the slot in the locking block (51).

6. The installation method of a double-cover ductile iron manhole cover according to claim 5, characterized in that: In step one, when the upper manhole cover (11) is installed, water is drained through two drainage holes (111), and then filtered through a filter screen (342) to remove impurities. The filtered water is then discharged through a circular hole (121).

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