A polymer composite manhole cover with hydraulic device

Abstract

This invention provides a polymer composite manhole cover with a hydraulic device, relating to the field of manhole cover application technology. The polymer composite manhole cover with a hydraulic device includes a manhole cover body and a mounting base. Two mounting plates are fixedly installed on the lower end of the inner side wall of the mounting base via second fixing bolts. A first fixing plate is fixedly installed on the upper end of both mounting plates. Second rotating seats are fixedly installed on both sides of the upper end of the first fixing plate. This invention enables the manhole cover to be opened or closed using a hydraulic mechanism, eliminating the need for manual operation. Furthermore, the manhole cover employs multiple rotating mechanisms for opening and closing, allowing for perfect adaptation during opening and closing. The installation mechanism is integrated into a single unit, reducing the risk of theft. The manhole cover can also be disassembled for maintenance. Moreover, the manhole cover is made of high-temperature resistant, pressure-resistant, and waterproof composite material, improving its strength in terms of high temperature resistance, pressure resistance, and waterproofing.

Description

Technical Field

[0001] A polymer composite manhole cover with a hydraulic device. Background Technology

[0002] Manhole covers are used to cover deep wells in roads or homes to prevent people or objects from falling in. They can be classified by material into metal manhole covers, high-strength fiber cement concrete manhole covers, resin manhole covers, etc. Manhole covers are further divided into ordinary manhole covers, smart manhole covers, and protective manhole covers. Ordinary manhole covers are mainly used to seal underground drainage pipes, ventilation ducts, and other openings in the ground in buildings. Common types include cast iron, precast fiberglass manhole covers, cast aluminum manhole covers, steel manhole covers, and stainless steel manhole covers. Smart manhole covers are an upgraded version of ordinary manhole covers, incorporating an intelligent control structure that allows for controlled opening and closing. They feature intelligent remote control, safety, reliability, and convenient operation. The installation of manhole covers mainly involves three steps: removing the old manhole cover, inspecting the new manhole cover, pouring concrete, and installing the manhole cover. Removing the old manhole cover involves first removing it, which will create a cavity. If possible, the cavity should be cleaned before removing the old manhole cover. Inspecting the new manhole cover involves checking its condition to ensure quality, waterproofing, and wear resistance. If any defects are found, it should be replaced promptly. Pouring concrete involves compacting the concrete after pouring it, and ensuring it fully hardens to guarantee the installation's stability. Installing the manhole cover involves placing it in its fixed position and securing it to the four sides of the opening using bolts or spot welding, ensuring a tight seal to prevent water leakage.

[0003] Existing manhole covers are generally opened or closed manually, requiring significant manpower. Furthermore, the small gaps at the seal of the manhole cover lead to occasional protrusions at the edges during manual placement, necessitating manual correction. The weight of the manhole cover itself causes it to press down rapidly when the gap is suddenly closed, posing a risk of pinching the worker's hand if they don't quickly withdraw their fingers. Additionally, current manhole cover installation methods typically involve simply placing the cover directly, resulting in poor installation quality and insufficient safety. Moreover, manhole covers are generally made of metal, making them vulnerable to theft. This common installation method allows for easy prying up with tools, creating a significant risk of theft. Therefore, those skilled in the art have proposed a polymer composite manhole cover with a hydraulic system to address the problems mentioned in the background. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a polymer composite manhole cover with a hydraulic device. This device allows the manhole cover to be opened or closed using a hydraulic mechanism, eliminating the need for manual operation. The opening and closing mechanism employs multiple rotating mechanisms, ensuring perfect adaptation during opening and closing. The manhole cover integrates the installation mechanism into a single unit. In the event of theft, the entire installation mechanism would need to be stolen, as it is heavy and bulky, significantly enhancing the security of the manhole cover and making it difficult for thieves to operate, thus reducing the risk of theft. The manhole cover can also be disassembled for inspection and repair. Furthermore, the manhole cover is made of high-temperature resistant, pressure-resistant, and waterproof composite material, improving its strength in these areas. This invention solves the problems of existing manhole covers requiring manual operation for opening and closing, being time-consuming and labor-intensive, being easily stolen, and having poor overall protective performance.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a polymer composite manhole cover with a hydraulic device, comprising a manhole cover body and a mounting base. Two mounting plates are fixedly mounted on the lower end of the inner side wall of the mounting base via second fixing bolts. A first fixing plate is fixedly mounted on the upper end of both mounting plates. Second rotating seats are fixedly mounted on both sides of the upper end of the first fixing plate. A hydraulic cylinder is rotatably connected to one side of each of the two second rotating seats. A second fixing plate is fixedly connected to the upper end of each of the two hydraulic cylinders. A third rotating seat is fixedly mounted on the upper end of each of the two second fixing plates. A first rotating seat is fixedly mounted in the middle of the upper end of the first fixing plate. A transition column is rotatably connected to one side of the first rotating seat. A support seat is fixedly mounted on the upper end of the transition column. Sliding grooves are formed on both side walls of the support seat. Sliding blocks are slidably mounted inside each of the two sliding grooves. A fourth rotating seat is fixedly mounted on one side wall of each of the two sliding blocks. Two adjacent third and fourth rotating seats are grouped together. The two groups of third and fourth rotating seats are connected by... The support base is rotatably connected to a connecting plate. Both sides of the upper surface of the support base have through slots. The upper ends of the two sliders are fixedly connected to adapter rods that pass through the through slots. The upper ends of the two adapter rods are fixedly provided with fifth rotating seats. The upper ends of the two fifth rotating seats are rotatably connected to support connecting frames. The upper ends of the two support connecting frames are rotatably connected to sixth rotating seats. The two sixth rotating seats are fixedly connected to the main body of the manhole cover. A first fixing ring is fixedly installed on the upper side of the outer wall of the mounting base by a first fixing screw. A second fixing ring is fixedly installed on the lower side of the outer wall of the mounting base by a second fixing screw. Multiple limiting slide rods are fixedly connected to the upper end of the second fixing ring. Multiple limiting slide rods are connected to a movable ring. A first connecting seat is fixedly installed on one side of the outer wall of the first fixing ring. A third connecting seat is fixedly installed on one side of the first connecting seat. A second connecting seat is fixedly installed on one side of the outer wall of the manhole cover. A rotating shaft is rotatably connected to one side of the second connecting seat. The rotating shaft is fixedly connected to the third connecting seat.

[0008] Through the above technical solution, the mounting mechanism of the first fixed plate can be determined by the second fixing bolt and the mounting plate, and the first fixed plate can be installed and disassembled. The second rotating seat can adapt to the adjustment angle when the hydraulic cylinder is started, ensuring that the hydraulic cylinder does not get stuck when lifting. The second fixed plate determines the installation position of the third rotating seat and provides a rotating mechanism for lifting. The first rotating seat, the adapter column, and the support seat determine the main support mechanism of the lifting mechanism. The rotating mechanism can adapt to the opening angle of the manhole cover body. Through the chute, slider, fourth rotating seat, connecting plate, through groove, adapter rod, fifth rotating seat, support connecting frame, and sixth rotating seat, the slider can be moved up and down by the rotating mechanism and connecting plate when the hydraulic cylinder is started. At the same time, during the up and down movement of the slider, the pre-loaded... The design incorporates a through-slot, allowing the adapter rod to be freely and unobstructedly adjusted up and down. A designed rotating mechanism connects it to the main body of the manhole cover, enabling automatic opening and closing of the manhole cover. The first fixing screw determines the installation method of the first fixing ring, which can also be disassembled. The second fixing screw determines the installation method of the second fixing ring, which does not require disassembly. Multiple limiting slide rods limit the movement of the movable ring, ensuring it can only slide on the outer wall of the limiting slide rods. The first and third connecting seats provide sufficient installation space to connect with the second connecting seat and the rotating shaft, thus forming a unified whole with the manhole cover body, chassis, and first fixing ring. When the first fixing ring is removed using the first fixing screw, the entire manhole cover body can also be detached from the mounting base for easy maintenance.

[0009] Preferably, a high-temperature resistant layer is fixedly laid at the upper part of the interior of the manhole cover body, a pressure-resistant layer is fixedly laid at the lower part of the high-temperature resistant layer, and a waterproof layer is fixedly laid at the lower part of the pressure-resistant layer. The high-temperature resistant layer is made of resin polymer material, the pressure-resistant layer is made of cement-based polymer material, and the waterproof layer is made of SMC polymer material. Through the above technical solution, the overall high-temperature resistance, pressure resistance, and waterproof performance of the manhole cover body can be improved. The high-temperature resistance is mainly for protection against exposure to sunlight, the pressure resistance is mainly for buffering pedestrian and vehicle passage, and the waterproof is mainly for protection against water entering the manhole cover.

[0010] Preferably, the first fixed ring and the movable ring are threaded together by a plurality of first fixing bolts, and each of the plurality of first fixing bolts has a nut threaded onto its outer wall. Through the above technical solution, when the first fixed ring and the movable ring are attached and fitted, the first fixed ring and the movable ring are connected and fitted by the first fixing bolts, and then the threads are tightened by the nuts, which improves the installation and fixation, and facilitates the separation and disassembly of the first fixed ring and the movable ring.

[0011] Preferably, the upper surface of the mounting base is provided with an annular sealing groove, the lower end of the manhole cover body is fixedly provided with a chassis, the lower end of the chassis is fixedly provided with an annular sealing protrusion, and the outer wall of the annular sealing protrusion is fixedly provided with a sealing sleeve. Through the above technical solution, the annular sealing groove can provide a limiting locking space, and the annular sealing protrusion at the lower end of the chassis can engage with the annular sealing groove. The sealing sleeve can reduce the gap generated between the annular sealing protrusion and the annular sealing groove after engagement, thereby improving the installation sealing performance of the manhole cover body.

[0012] Preferably, the upper surface of the manhole cover body is fixedly provided with anti-slip texture; through the above technical solution, the anti-slip texture can provide sufficient friction when pedestrians walk on the upper part of the manhole cover body to prevent pedestrians from slipping.

[0013] Preferably, multiple fitting frames are fixedly installed between the manhole cover body and the chassis; through the above technical solution, the stability and fixation of the connection between the manhole cover body and the chassis can be improved by the fitting frames.

[0014] Preferably, a plurality of third fixing screws are threadedly connected between the third connecting seat and the first connecting seat; through the above technical solution, the third fixing screws can provide sufficient fixation when the third connecting seat and the first connecting seat are installed and connected.

[0015] Preferably, the height of the support base is lower than the height of the mounting base; through the above technical solution, interference with the support base when the manhole cover body is closed can be avoided, preventing it from being closed.

[0016] (III) Beneficial Effects

[0017] This invention provides a polymer composite manhole cover with a hydraulic device. It offers the following advantages: 1. Compared to existing manhole covers, this invention provides a polymer composite manhole cover with a hydraulic device. When the manhole cover is closed or opened, the hydraulic cylinder is activated, causing the connecting plate to advance under the action of the third and fourth rotating seats. When the fourth rotating seat is pushed by the connecting plate, the slider begins to slide inside the groove, causing the connecting rod to be forcefully pushed upwards and pass through the through groove. The supporting connecting frame, rotatably connected by the fifth rotating seat, and the sixth rotating seat, rotatably connected by the supporting connecting frame, begin to supply force to the manhole cover body. Therefore, when the manhole cover body is pushed, the manhole cover body begins to open under the action of the rotating shaft through multiple rotating mechanisms. Similarly, when closing, only the hydraulic cylinder needs to be activated to retract the connecting plate, achieving automatic opening and closing of the manhole cover without manual operation, saving time and effort.

[0018] 2. This invention provides a polymer composite manhole cover with a hydraulic device. Compared with existing manhole covers, this manhole cover can divide the manhole cover area into regions for easy maintenance. The main body of the manhole cover is fixed to the outer wall of the mounting base using a first fixed ring and a movable ring, so that the main body of the manhole cover and the first fixed ring form a whole. When disassembling, only the first fixing screw on the first fixed ring needs to be removed to separate the main body of the manhole cover from the mounting base. At the same time, during installation, the upper and lower positions of the movable ring can be adjusted using a limiting slide rod, a first fixing bolt, and a nut to fix the first fixed ring, thereby ensuring relative fixation and stability during the installation of the main body of the manhole cover.

[0019] 3. This invention provides a high-polymer composite manhole cover with a hydraulic device. Compared with existing manhole covers, this manhole cover adds a high-temperature resistant composite layer, a pressure-resistant composite layer, and a waterproof composite layer, which improves the overall high-temperature resistance, pressure resistance, and waterproof performance of the manhole cover. The high-temperature resistance mainly protects against exposure to sunlight, the pressure resistance mainly buffers pedestrian and vehicle traffic, and the waterproof performance protects against water ingress. At the same time, when the manhole cover is closed, the sealing performance of the sealing position can be increased by the action of the annular sealing groove, the annular sealing protrusion, and the sealing sleeve, making it highly practical. Attached Figure Description

[0020] Figure 1 This is an isometric view of a polymer composite manhole cover with a hydraulic device according to the present invention;

[0021] Figure 2 This is a schematic diagram of the internal connection structure of a polymer composite manhole cover mounting base with a hydraulic device according to the present invention;

[0022] Figure 3 This is a schematic diagram of the hydraulic mechanism of a polymer composite manhole cover with a hydraulic device according to the present invention;

[0023] Figure 4 This is a schematic diagram of the connection structure between the first fixed ring and the movable ring of a polymer composite manhole cover with a hydraulic device according to the present invention;

[0024] Figure 5 This is a schematic diagram of the connection structure of the movable ring and the second fixed ring of a polymer composite manhole cover with a hydraulic device according to the present invention;

[0025] Figure 6 This is a schematic diagram of the bottom structure of a polymer composite manhole cover with a hydraulic device according to the present invention.

[0026] Figure 7 This is a schematic diagram of the structure of the first connecting seat of a polymer composite manhole cover with a hydraulic device according to the present invention;

[0027] Figure 8 This is a schematic diagram of the internal structure of a polymer composite manhole cover with a hydraulic device according to the present invention.

[0028] Figure 9 This is a schematic diagram of the structure of a polymer composite manhole cover lifting mechanism with a hydraulic device according to the present invention;

[0029] Figure 10 This is a schematic diagram of the structure of a polymer composite manhole cover support base with a hydraulic device according to the present invention.

[0030] The components include: 1. Manhole cover body; 2. Mounting base; 3. Chassis; 4. First fixing ring; 5. Movable ring; 6. Second fixing ring; 7. Second fixing screw; 8. First connecting seat; 9. Annular sealing groove; 10. First fixing plate; 11. Hydraulic cylinder; 12. Support seat; 13. First rotating seat; 14. Adapter column; 15. Second rotating seat; 16. Second fixing plate; 17. Third rotating seat; 18. Connecting plate; 19. Fourth rotating seat; 20. First fixing bolt; 21. Nut; 22. ... 1. Fixing screw; 23. Limiting slide bar; 24. Annular sealing protrusion; 25. Sealing sleeve; 26. Waterproof layer; 27. Second connecting seat; 28. Rotating shaft; 29. ​​Third connecting seat; 30. Third fixing screw; 31. High temperature resistant layer; 32. Pressure resistant layer; 33. Sliding block; 34. Adapter rod; 35. Fifth rotating seat; 36. Support connecting frame; 37. Sixth rotating seat; 38. Slide groove; 39. Through groove; 40. Anti-slip texture; 41. Fitting frame; 42. Mounting plate; 43. Second fixing bolt. Detailed Implementation

[0031] 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. Example 1:

[0032] like Figure 1-10As shown, this embodiment of the invention provides a polymer composite manhole cover with a hydraulic device, including a manhole cover body 1 and a mounting base 2. Two mounting plates 42 are fixedly mounted on the lower end of the inner side wall of the mounting base 2 by second fixing bolts 43. A first fixing plate 10 is fixedly mounted on the upper end of both mounting plates 42. Second rotating seats 15 are fixedly mounted on both sides of the upper end of the first fixing plate 10. A hydraulic cylinder 11 is rotatably connected to one side of each of the two second rotating seats 15. A second fixing plate 16 is fixedly connected to the upper end of each of the two hydraulic cylinders 11. A third rotating seat 17 is fixedly mounted on the upper end of each of the two second fixing plates 16. A first rotating seat 13 is fixedly mounted in the middle of the upper end of the first fixing plate 10. A transition column 14 is rotatably connected to the side. A support base 12 is fixedly installed on the upper end of the transition column 14. Slide grooves 38 are opened on both side walls of the support base 12. Sliding sliders 33 are slidably installed inside the two slide grooves 38. A fourth rotating seat 19 is fixedly installed on one side wall of each of the two sliders 33. Two adjacent third rotating seats 17 and two fourth rotating seats 19 are grouped together. A connecting plate 18 is rotatably connected between the two groups of third rotating seats 17 and fourth rotating seats 19. Through grooves 39 are opened on both sides of the upper end face of the support base 12. A transition rod 34 is fixedly connected to the upper end of each of the two sliders 33 and passes through the through groove 39. A fifth rotating seat 35 is fixedly installed on the upper end of each of the two transition rods 34. Each of the two support connecting frames 36 is rotatably connected to a support connecting frame 36. A sixth rotating seat 37 is rotatably connected to the upper end of each support connecting frame 36. Both sixth rotating seats 37 are fixedly connected to the manhole cover body 1. The mounting mechanism of the first fixing plate 10 can be determined by the second fixing bolt 43 and the mounting plate 42, allowing for the installation and removal of the first fixing plate 10. The second rotating seat 15 can adapt to the adjusted angle and self-convert when the hydraulic cylinder 11 is started, preventing the hydraulic cylinder 11 from jamming during lifting. The second fixing plate 16 determines the installation position of the third rotating seat 17 and provides a rotating mechanism for lifting. The first rotating seat 13, the adapter column 14, and the support... The seat 12 can determine the main support mechanism of the lifting mechanism. The rotating mechanism can adapt to the opening angle of the manhole cover body 1. Through the slide groove 38, slider 33, fourth rotating seat 19, connecting plate 18, through groove 39, adapter rod 34, fifth rotating seat 35, support connecting frame 36 and sixth rotating seat 37, when the hydraulic cylinder 11 is started, the rotating mechanism and connecting plate 18 can move the slider 33 up and down. At the same time, during the up and down movement of the slider 33, the adapter rod 34 can be freely and unobstructedly adjusted up and down through the preset through groove 39. Then, the designed rotating mechanism is rotatably connected to the manhole cover body 1, so that the manhole cover body 1 can be automatically opened or closed.

[0033] A first fixing ring 4 is fixedly installed on the upper side of the outer wall of the mounting base 2 by a first fixing screw 22. A second fixing ring 6 is fixedly installed on the lower side of the outer wall of the mounting base 2 by a second fixing screw 7. Multiple limiting slide rods 23 are fixedly connected to the upper end of the second fixing ring 6, and a movable ring 5 is provided through the multiple limiting slide rods 23. A first connecting seat 8 is fixedly installed on one side of the outer wall of the first fixing ring 4, and a third connecting seat 29 is fixedly installed on one side wall of the first connecting seat 8. A second connecting seat 27 is fixedly installed on one side of the outer wall of the manhole cover body 1. A rotating shaft 28 is rotatably connected to one side of the second connecting seat 27. The rotating shaft 28 is fixedly connected to the third connecting seat 29. The first fixing ring 4 can be fixed by the first fixing screw 22. The installation method of the fixed ring 4 is that it can be disassembled at the same time. The installation method of the second fixed ring 6 can be determined by the second fixing screw 7. The second fixed ring 6 does not need to be disassembled. The movable ring 5 can be limited by multiple limiting slide rods 23, so that the movable ring 5 can only slide on the outer wall of the limiting slide rod 23. The first connecting seat 8 and the third connecting seat 29 can provide sufficient installation space to connect with the second connecting seat 27 and the rotating shaft 28, so that the manhole cover body 1, the chassis 3 and the first fixed ring 4 form a whole. When the first fixed ring 4 is removed by the first fixing screw 22, the entire manhole cover body 1 can also be relatively separated from the mounting seat 2, which is convenient for maintenance.

[0034] A high-temperature resistant layer 31 is fixedly laid at the upper part of the inner surface of the manhole cover body 1. A pressure-resistant layer 32 is fixedly laid below the high-temperature resistant layer 31, and a waterproof layer 26 is fixedly laid below the pressure-resistant layer 32. The high-temperature resistant layer 31 is made of resin polymer material, the pressure-resistant layer 32 is made of cement-based polymer material, and the waterproof layer 26 is made of SMC polymer material. This arrangement improves the overall high-temperature resistance, pressure resistance, and waterproof performance of the manhole cover body 1. The high-temperature resistance primarily protects against sun exposure, while the pressure resistance provides cushioning for pedestrian and vehicular traffic. The waterproofing is primarily designed to protect against water ingress into the manhole cover. The first fixed ring 4 and the movable ring 5 are connected by multiple first fixed bolts 20, each with a nut 21 threaded onto its outer wall. When the first fixed ring 4 and the movable ring 5 are fitted together, the first fixed bolts 20 connect them, and then the threads are tightened using the nuts 21, improving installation stability and facilitating the separation and disassembly of the first fixed ring 4 and the movable ring 5. An annular sealing groove 9 is provided on the upper surface of the mounting base 2. A base plate 3 is fixedly installed at the lower end of the manhole cover body 1, and an annular sealing protrusion 24 is fixedly installed at the lower end of the base plate 3. A sealing sleeve 25 is fixedly installed on the outer wall of the annular sealing protrusion 24. The annular sealing groove 9 provides a limiting engagement space, while the annular sealing protrusion 24 at the lower end of the chassis 3 engages with the annular sealing groove 9. The sealing sleeve 25 reduces the gap between the annular sealing protrusion 24 and the annular sealing groove 9 after engagement, improving the sealing performance of the manhole cover body 1. Anti-slip textured surfaces 40 are fixedly provided on the upper surface of the manhole cover body 1, providing sufficient friction to prevent pedestrians from slipping. Multiple engagement brackets 41 are fixedly installed between the manhole cover body 1 and the chassis 3, improving the stability and fixation of the connection between them. The third connecting seat 29 and the first connecting seat 8 are connected by multiple threads. A third fixing screw 30 provides sufficient fixation when the third connecting seat 29 and the first connecting seat 8 are installed together. The height of the support seat 12 is lower than the height of the mounting seat 2. This lower height of the support seat 12 prevents interference with the support seat 12 when the manhole cover body 1 is closed, thus ensuring proper closure. The manhole cover body 1 is also equipped with a high-temperature resistant composite material layer 31, a pressure-resistant composite material layer 32, and a waterproof composite material layer 26, improving the overall high-temperature resistance, pressure resistance, and waterproof performance. The high-temperature resistance primarily protects against exposure to sunlight, the pressure resistance provides cushioning for pedestrian and vehicle traffic, and the waterproof performance protects against water ingress.Simultaneously, when the manhole cover is closed, the sealing performance at the sealing position can be increased by the action of the annular sealing groove 9, the annular sealing protrusion 24, and the sealing sleeve 25.

[0035] Working principle: When this high-polymer composite manhole cover with a hydraulic device is put into use, the hydraulic cylinder 11 is activated during the closing or opening of the manhole cover. This causes the connecting plate 18 to be pushed forward by the third rotating seat 17 and the fourth rotating seat 19. When the fourth rotating seat 19 is pushed by the connecting plate 18, the slider 33 will begin to slide inside the slide groove 38. Consequently, the adapter rod 34 will be forced upward and pass through the through groove 39. The support connecting frame 36, which is rotatably connected by the fifth rotating seat 35, and the sixth rotating seat 37, which is rotatably connected by the support connecting frame 36, begin to supply force to the manhole cover body 1. Thus, when the manhole cover body 1 is pushed, the manhole cover body 1 will begin to rotate through multiple rotating mechanisms. The manhole cover opens under the action of the moving shaft 28. Similarly, when it needs to be closed, the hydraulic cylinder 11 is activated to retract the connecting plate 18. The manhole cover can divide the manhole cover position into areas for easy maintenance. The main body 1 of the manhole cover is fixed to the outer wall of the mounting base 2 by the first fixed ring 4 and the movable ring 5, so that the main body 1 of the manhole cover and the first fixed ring 4 form a whole. When disassembling, the first fixing screw 22 on the first fixed ring 4 can be removed to separate the main body 1 of the manhole cover from the mounting base 2. At the same time, during installation, the upper and lower positions of the movable ring 5 can be adjusted by using the limit slide rod 23, the first fixing bolt 20 and the nut 21 to complete the fixation of the first fixed ring 4.

[0036] 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 polymer composite manhole cover with a hydraulic device, comprising a manhole cover body (1) and a mounting base (2), characterized in that: Two mounting plates (42) are fixedly installed on the lower end of the inner side wall of the mounting base (2) by the second fixing bolt (43). A first fixing plate (10) is fixedly installed on the upper end of the two mounting plates (42). A second rotating seat (15) is fixedly installed on both sides of the upper end of the first fixing plate (10). A hydraulic cylinder (11) is rotatably connected to one side of each of the two second rotating seats (15). A second fixing plate (16) is fixedly connected to the upper end of each of the two hydraulic cylinders (11). A third rotating seat (17) is fixedly installed on the upper end of each of the two second fixing plates (16). A first rotating seat (13) is fixedly installed in the middle of the upper end of the first fixing plate (10). A transition column (14) is rotatably connected to one side of the first rotating seat (13). A support seat (12) is fixedly installed on the upper end of the transition column (14). Slide grooves (38) are opened on both sides of the support seat (12). 8) Sliding blocks (33) are slidably arranged inside. A fourth rotating seat (19) is fixedly arranged on one side wall of each of the two sliding blocks (33). A third rotating seat (17) and a fourth rotating seat (19) are a group. A connecting plate (18) is rotatably connected between the two groups of third rotating seats (17) and fourth rotating seats (19). Through slots (39) are opened on both sides of the upper end face of the support seat (12). A transition rod (34) is fixedly connected to the upper end of each of the two sliding blocks (33) and the transition rod (34) passes through the through slot (39) respectively. A fifth rotating seat (35) is fixedly arranged at the upper end of each of the two transition rods (34). A support connecting frame (36) is rotatably connected to the upper end of each of the two fifth rotating seats (35). A sixth rotating seat (37) is rotatably connected to the upper end of each of the two support connecting frames (36). Both sixth rotating seats (37) are fixedly connected to the main body of the manhole cover (1). The upper side of the outer wall of the mounting base (2) is fixedly installed with a first fixing ring (4) by a first fixing screw (22). The lower side of the outer wall of the mounting base (2) is fixedly installed with a second fixing ring (6) by a second fixing screw (7). The upper end of the second fixing ring (6) is fixedly connected with multiple limiting slide rods (23). Multiple limiting slide rods (23) are connected together by a movable ring (5). The outer wall of the first fixing ring (4) is fixedly provided with a first connecting seat (8). The side wall of the first connecting seat (8) is fixedly provided with a third connecting seat (29). The outer wall of the manhole cover body (1) is fixedly provided with a second connecting seat (27). The side of the second connecting seat (27) is rotatably connected with a rotating shaft (28). The rotating shaft (28) is fixedly connected to the third connecting seat (29).

2. The polymer composite manhole cover with hydraulic device according to claim 1, characterized in that: The upper part of the manhole cover body (1) is fixedly laid with a high temperature resistant layer (31), the lower part of the high temperature resistant layer (31) is fixedly laid with a pressure-resistant layer (32), and the lower part of the pressure-resistant layer (32) is fixedly laid with a waterproof layer (26). The high temperature resistant layer (31) is made of resin polymer material, the pressure-resistant layer (32) is made of cement-based polymer material, and the waterproof layer (26) is made of SMC polymer material.

3. A polymer composite manhole cover with a hydraulic device according to claim 1, characterized in that: The first fixed ring (4) and the movable ring (5) are connected by a plurality of first fixed bolts (20) with threads, and the outer walls of the plurality of first fixed bolts (20) are threaded with nuts (21).

4. A polymer composite manhole cover with a hydraulic device according to claim 1, characterized in that: The mounting base (2) has an annular sealing groove (9) on its upper surface. The bottom of the manhole cover body (1) is fixedly provided with a chassis (3). The bottom of the chassis (3) is fixedly provided with an annular sealing protrusion (24). The outer wall of the annular sealing protrusion (24) is fixedly provided with a sealing sleeve (25).

5. A polymer composite manhole cover with a hydraulic device according to claim 1, characterized in that: The upper surface of the manhole cover body (1) is fixedly provided with anti-slip texture (40).

6. A polymer composite manhole cover with a hydraulic device according to claim 4, characterized in that: Multiple fitting frames (41) are fixedly installed between the manhole cover body (1) and the chassis (3).

7. A polymer composite manhole cover with a hydraulic device according to claim 1, characterized in that: A plurality of third fixing screws (30) are threadedly connected between the third connecting seat (29) and the first connecting seat (8).

8. A polymer composite manhole cover with a hydraulic device according to claim 1, characterized in that: The height of the support base (12) is lower than the height of the mounting base (2).

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