A pulley well lid

Abstract

The application discloses a pulley well lid and belongs to the field of urban pipeline facilities. The pulley well lid comprises a well frame, a well lid main body is covered on the well frame, a lap joint cover is connected to one end of the well frame, a holding unit is arranged on the lap joint cover, a labor-saving mechanism is arranged on the bottom surface of the well lid main body, and the labor-saving mechanism is in sliding fit with the contact surface of the well frame. The labor-saving mechanism can offset the self-gravity of the well lid main body through the sliding action of the contact surface of the well frame. The pulley well lid of the application offsets part of the self-gravity when being opened, reduces the force intensity, is suitable for heavy well lids, can be smoothly opened by one person, reduces the labor intensity, and improves the convenience and efficiency of maintenance.

Description

Technical Field

[0001] This invention relates to the field of urban pipeline infrastructure technology, and in particular to a pulley manhole cover. Background Technology

[0002] In the field of urban pipeline infrastructure engineering, manhole covers are key supporting facilities for underground pipeline systems (such as drainage, gas, and power pipelines). They are mainly used to cover pipe well openings, serving to protect, bear weight, and facilitate later maintenance. Currently, most manhole covers widely used in cities are one-piece structures made of cast iron or composite materials, usually fixed to the well opening frame by their own weight. In practical applications, these manhole covers need to be compatible with pipe well openings of different diameters, and often adopt standardized size designs to meet the unified construction and maintenance needs of urban pipeline infrastructure engineering.

[0003] Currently, opening manhole covers during maintenance is quite laborious, and the specific operating procedure is inconvenient. First, maintenance personnel need to clean the surface and edges of the manhole cover of debris and dust to avoid jamming when opening it. Then, tools such as crowbars need to be inserted into the gap between the manhole cover and the frame, and the edge of the manhole cover is gradually pried open using the lever principle to separate the manhole cover from the frame. If the manhole cover is heavy (such as a heavy cast iron manhole cover), a single person needs to adjust the fulcrum of the crowbar multiple times and apply force repeatedly to lift the manhole cover to a certain angle, which increases the labor intensity of the maintenance work.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0005] This invention provides a pulley manhole cover to solve the technical problem that opening existing manhole covers during maintenance is laborious.

[0006] The present invention adopts the following technical solution: a pulley manhole cover. It includes a manhole frame, on which a manhole cover body is placed; one end of the manhole frame is connected to an overlapping cover, which is provided with a gripping unit for manual handling to assist in opening the manhole cover body; the bottom surface of the manhole cover body is equipped with a force-saving mechanism, which slides in contact with the manhole frame; when a person manually opens the manhole cover body using the gripping unit, the force-saving mechanism can offset the weight of the manhole cover body itself through the sliding action with the contact surface of the manhole frame, thereby achieving effortless opening.

[0007] Furthermore, the labor-saving mechanism includes at least two sets of pulley assemblies symmetrically arranged on the bottom surface of the manhole cover body. Each set of pulley assemblies includes two sets of first pulleys and two sets of second pulleys. The first pulleys and second pulleys are slidably engaged with the inner wall of the manhole frame. Corresponding to the two sets of first pulleys on the front side of the manhole cover body, an auxiliary unit is also configured on one side of the inner wall of the manhole frame. The auxiliary unit is used to guide and limit the sliding of the first pulleys on the front side.

[0008] Furthermore, the auxiliary unit includes two sets of auxiliary base plates that correspond to and cooperate with the first pulley on the front side. The auxiliary base plates are fixed to the bottom surface of the inner wall of the well frame. A ramp plate is connected to the auxiliary base plate, and a limiting member is fixed on one side of the auxiliary base plate. A storage gap is formed between the limiting member and the lower end of the ramp plate. This gap is used to accommodate the first pulley on the corresponding side when the well cover body is closed.

[0009] Furthermore, the overlapping cover has an accommodating groove, and the gripping unit includes a U-shaped handle; the handle is adapted to be embedded in the accommodating groove, and its two ends penetrate the overlapping cover and are fixed with anti-detachment ends, which are used to prevent the handle from detaching from the accommodating groove; the bottom surface of the overlapping cover is fixed with an overlapping end, and the handle can be hidden in the accommodating groove and supported and positioned by the overlapping end.

[0010] Furthermore, it also includes a support mechanism for supporting the main body of the manhole cover in the unfolded state. The support mechanism includes two sets of guide boxes with openings, and the two sets of guide boxes are respectively fixed to the corresponding sides of the inner wall of the manhole frame. A slide plate is slidably fitted inside the guide box. A guide rod is fixed on one side of the slide plate, and the slide plate is movably installed through one end of the guide box through the guide rod to realize the sliding of the slide plate along the guide box.

[0011] Furthermore, an extension plate is fixedly provided on the side of the slide plate away from the guide rod, and the extension plate is movably disposed through the corresponding side of the guide box; a support block is fixed on the upper surface of the extension plate, and a rotating shaft is fixed on the side of the support block, and the manhole cover body is rotatably sleeved between the two sets of rotating shafts; when the manhole cover body is unfolded by the gripping unit, the first pulley and the second pulley on the bottom surface of the manhole cover body slide along the inner wall contact surface of the manhole frame, and at the same time, the slide plate slides synchronously along the inside of the guide box.

[0012] Furthermore, the two sets of slide plates have an open shape on their adjacent sides, and a boss is integrally provided on the bottom surface of one side of its inner wall. The boss has a sloping surface and a flat surface. A support plate is fixedly provided on the inner side of the slide plate, and the upper surface of the support plate is flush with the plane of the boss. A hinge plate is hinged to one side of the support plate by a torsion spring. In the default state, the upper surface of the hinge plate is flush with the plane of the boss and the upper surface of the support plate, and the three together with the top surface of the inner wall of the slide plate form a first slide. A sliding sleeve is slidably provided in the first slide. A pin is rotatably connected to the sliding sleeve by a bearing. A rotating rod is fixed at one end of the pin. A movable part is movably connected to the rotating rod. The movable part is fixed at a near-central position on the bottom surface of the manhole cover body.

[0013] Furthermore, the end of the support plate away from the hinge plate is connected to a downwardly extending right-angled overlapping platform. The overlapping platform is used to receive the sliding sleeve and assist in supporting the main body of the manhole cover in the open state. A concave part is fixed to the inner wall of the slide plate near the overlapping platform. A baffle plate is hinged inside the concave part by a torsion spring. In the default state, the upper end surface of the baffle plate is in contact with the bottom surface of one end of the overlapping platform. The bottom surface of the inner wall of the slide plate, the slope surface of the boss, the hinge plate and the bottom surface of the overlapping platform enclose and form a second slide.

[0014] Furthermore, the inner wall of the manhole frame has a contact plate that contacts the second pulley; the support mechanism also includes two sets of cleaning components, which are embedded in the bottom surface of the manhole cover body. The two sets of cleaning components correspond to the two sets of second pulleys respectively, and are used to remove impurities in front of the second pulley's path; the cleaning component includes a fixed track, which is fixed to the bottom surface of the manhole cover body by a connector; a right-angle frame is slidably fitted on the bottom surface of the fixed track, and a return spring is connected between the horizontal end of the right-angle frame and one end of the inner wall of the fixed track, and a guide shaft is fixedly provided at one end of the horizontal end of the right-angle frame. The guide shaft passes through the return spring and is movably installed through the corresponding end of the fixed track; a bushing is fixedly provided on the bottom surface of the horizontal end of the right-angle frame, and a vertically arranged rotating shaft is connected inside the bushing through a bearing; One end of the rotating shaft extends movably through the horizontal end of the right-angle frame and is fixedly fitted with a gear. The side of the fixed track is fixedly fitted with a rack that meshes with the gear via a bracket. One end of the rotating shaft is connected to a protective sleeve via a bearing. The two ends of the protective sleeve are slidably fitted with the two sides of the fixed track. The other end of the rotating shaft is fixedly fitted with a scraper, which is in contact with the surface of the contact plate.

[0015] Furthermore, an anti-detachment rod is hinged to one vertical end of the right-angle frame, and the anti-detachment rod is movably disposed through the contact plate; an inclined groove is formed on the contact plate, and a sliding sleeve is sleeved on the anti-detachment rod, with the sliding sleeve fitting against the bottom surface of the contact plate; a dovetail block is integrally and symmetrically fixed on the surface of the sliding sleeve, and a dovetail groove adapted to slide with the dovetail block is formed on the bottom surface of the contact plate, with the dovetail groove having the same inclination as the inclined groove; a stop platform is fixed on the contact plate, and the side of the stop platform near the second pulley is set as an inclined surface, with the inclination of the inclined surface having the same inclination as the inclined groove.

[0016] The above-mentioned at least one technical solution adopted in this invention can achieve the following beneficial effects: A pulley manhole cover features a gripping unit on an overlapping cover at one end of the manhole frame, allowing for direct manual gripping without the need for a crowbar, eliminating the steps of tool adaptation and fulcrum adjustment. Simultaneously, a force-saving mechanism on the bottom surface of the manhole cover slides in contact with the manhole frame, offsetting some of the cover's own weight during opening, reducing the required force. This allows for smooth opening by a single person without repeated force application, reducing the tedious process of cleaning debris and operating tools, lowering labor intensity, and improving the convenience and efficiency of maintenance operations. Attached Figure Description

[0017] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0018] In the attached diagram: Figure 1 This is an overall schematic diagram of a pulley manhole cover according to this application; Figure 2 for Figure 1 Schematic diagram of the manhole cover in its closed state; Figure 3 This is a structural diagram of the manhole cover in the open state; Figure 4 for Figure 3 A partial structural diagram; Figure 5 for Figure 4 Enlarged view of point A; Figure 6 for Figure 3 A partial structural diagram; Figure 7 for Figure 3 A partial structural diagram; Figure 8 for Figure 7 Enlarged view of point B; Figure 9 for Figure 7 Enlarged view of point C; Figure 10 for Figure 9 Enlarged view of point D; Figure 11 for Figure 7 A schematic diagram of the bottom structure; Figure label: 1. Manhole frame; 11. Manhole cover body; 12. Overlapping cover; 121. Receiving groove; 13. Handle; 131. Anti-detachment end; 132. Overlapping end; 2. Labor-saving mechanism; 21. Auxiliary base plate; 22. Inclined plate; 23. Limiting component; 24. First pulley; 25. Second pulley; 3. Support mechanism; 31. Guide box; 32. Slide plate; 321. Boss; 322. Inclined surface; 323. Support plate; 324. Hinge plate; 325. Overlapping platform; 326. Concave component; 327. Covering plate; 33. Guide rod; 34. Support block; 341. Rotating shaft; 35. Contact plate; 351. Inclined groove; 352. Stop platform; 353. Dovetail groove; 36. Connecting piece; 37. Fixed track; 371. Return spring; 38. Right angle bracket; 381. Anti-detachment rod; 382. Sliding sleeve; 383. Dovetail block; 39. Rotating shaft; 391. Bushing; 392. Protective sleeve; 393. Scraper; 310. Gear; 311. Rack; 312. Sliding sleeve; 313. Rotating rod; 314. Moving part. Detailed Implementation

[0019] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0020] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Example 1:

[0021] Reference Figures 1-3 As shown, the present invention provides a pulley manhole cover, including a manhole frame 1, on which a manhole cover body 11 is covered; one end of the manhole frame 1 is connected to an overlapping cover 12, and the overlapping cover 12 is provided with a gripping unit for manual gripping to assist in lifting the manhole cover body 11; the bottom surface of the manhole cover body 11 is provided with a force-saving mechanism 2, which slides in contact with the manhole frame 1; when a person lifts the manhole cover body 11 by the gripping unit, the force-saving mechanism 2 can offset part of the weight of the manhole cover body 11 through the sliding action with the contact surface of the manhole frame 1, so as to achieve effortless opening.

[0022] Reference Figures 1-4As shown, the labor-saving mechanism 2 in this invention is used to offset part of the weight of the manhole cover body 11 when it is lifted, so as to achieve labor-saving operation. As a preferred embodiment, the labor-saving mechanism 2 includes at least two sets of pulley assemblies symmetrically arranged on the bottom surface of the manhole cover body 11. Each set of pulley assemblies includes two sets of first pulleys 24 and two sets of second pulleys 25. The first pulleys 24 and the second pulleys 25 are in sliding contact with the bottom surface of the inner wall of the manhole frame 1 and can slide synchronously along the inner wall of the manhole frame 1 as the manhole cover body 11 is lifted. An auxiliary unit is also configured at the corresponding position on the inner wall of the manhole frame 1. The auxiliary unit can guide the first pulley 24 on the front side to prevent it from deviating from the preset path.

[0023] In this invention, the auxiliary unit is used to guide and initially position the front first pulley 24 during the opening process of the manhole cover body 11. Preferably, the auxiliary unit includes two sets of auxiliary base plates 21 that correspond to and cooperate with the front first pulley 24. The auxiliary base plates 21 are fixed to the bottom surface of the inner wall of the manhole frame 1. A ramp plate 22 is connected to the auxiliary base plate 21, and a limiting member 23 is fixed on one side of the auxiliary base plate 21. A storage gap is formed between the limiting member 23 and the lower end of the ramp plate 22. This gap is used to accommodate the first pulley 24 on the corresponding side when the manhole cover body 11 is closed, so that the first pulley 24 maintains a stable initial position when closed.

[0024] To achieve concealed storage and convenient operation of the grip unit, the overlapping cover 12 is provided with a receiving groove 121. The grip unit includes a U-shaped handle 13. The handle 13 is adapted to be embedded in the receiving groove 121, and its two ends pass through the overlapping cover 12 and are fixed with anti-detachment ends 131. The anti-detachment ends 131 are used to prevent the handle 13 from detaching from the receiving groove 121. The bottom surface of the overlapping cover 12 is fixed with an overlapping end 132. When the handle 13 is not in use, the handle 13 can be completely hidden in the receiving groove 121 and supported and positioned by the overlapping end 132 to prevent the handle 13 from loosening or protruding and affecting the flatness of the manhole cover.

[0025] In actual use, when it is necessary to open the manhole cover for inspection, maintenance or other operations, the operator can insert his / her fingers into the receiving groove 121 of the overlapping cover 12 and pull up the U-shaped handle 13 hidden in the groove. The operator can then apply an upward opening force by holding the exposed handle 13. During the opening process, two sets of pulley assemblies symmetrically arranged on the bottom surface of the manhole cover body 11 move synchronously. The first pulley 24 on the front side first comes out from the storage gap of the auxiliary unit, slides along the inclined surface of the ramp plate 22 and enters the preset sliding path on the bottom surface of the inner wall of the manhole frame 1. The limiting member 23 prevents the first pulley 24 from shifting laterally and leaving the path. The first pulley 24 on the rear side and the two sets of second pulleys 25 slide and cooperate synchronously along the bottom surface of the inner wall of the manhole frame 1. The rolling friction between the pulley and the contact surface replaces the sliding friction of the traditional manhole cover. At the same time, the supporting effect of the pulley assembly offsets part of the weight of the manhole cover body 11, reducing the force required for opening. Once the manhole cover is opened to the preset angle, the operator can control the flipping angle or moving position of the manhole cover through the handle 13. After the operation is completed, the manhole cover body 11 is closed by reversing the operation. The first pulley 24 on the front slides back into the storage gap along the ramp 22 to achieve initial positioning. The handle 13 is then rotated to be fully embedded in the receiving groove 121 to ensure the flatness of the manhole cover surface. Example 2:

[0026] Reference Figures 4-9 As shown, the present invention provides a pulley manhole cover, which further includes a support mechanism 3 for supporting the manhole cover body 11 in the unfolded state. The support mechanism 3 includes two sets of guide boxes 31 with openings. The two sets of guide boxes 31 are respectively fixed to the corresponding sides of the inner wall of the manhole frame 1. A slide plate 32 is slidably fitted inside the guide box 31. A guide rod 33 is fixed on one side of the slide plate 32, and the slide plate 32 is movably installed through one end of the guide box 31 through the guide rod 33 to realize the sliding of the slide plate 32 along the guide box 31.

[0027] To achieve the rotatable connection between the manhole cover body 11 and the support mechanism 3, an extension plate is fixedly provided on the side of the slide plate 32 away from the guide rod 33. The extension plate is movably connected through the corresponding side of the guide box 31. A support block 34 is fixedly provided on the upper surface of the extension plate. A rotating shaft 341 is fixedly provided on the side of the support block 34. The manhole cover body 11 is rotatably sleeved between the two sets of rotating shafts 341. When the manhole cover body 11 is unfolded by the gripping unit, the first pulley 24 and the second pulley 25 on the bottom surface of the manhole cover body 11 slide along the inner wall contact surface of the manhole frame 1. At the same time, the slide plate 32 slides synchronously along the inside of the guide box 31, ensuring that the support mechanism 3 moves synchronously with the manhole cover body 11.

[0028] To define the sliding guide path, the sides of the two sets of slide plates 32 that are close to each other are open. A boss 321 is integrally provided on the bottom surface of one side of its inner wall. The boss 321 has a ramp surface 322 and a plane. A support plate 323 is fixedly provided on the inner side of the slide plate 32. The upper surface of the support plate 323 is flush with the plane of the boss 321. A hinge plate 324 is hinged to one side of the support plate 323 by a torsion spring. In the default state, the upper surface of the hinge plate 324 is flush with the plane of the boss 321 and the upper surface of the support plate 323. The three of them and the top surface of the inner wall of the slide plate 32 enclose each other to form the first slide. A sliding sleeve 312 is slidably installed in the first slide rail. A pin is rotatably connected to the sliding sleeve 312 through a bearing. A rotating rod 313 is fixed at one end of the pin. A movable part 314 is movably connected to the rotating rod 313. The movable part 314 is fixed at a near-central position on the bottom surface of the manhole cover body 11, so as to realize the linkage between the manhole cover body 11 and the sliding sleeve 312.

[0029] To achieve the support and positioning of the manhole cover body 11, the end of the support plate 323 away from the hinge plate 324 is connected to a downwardly extending right-angled overlapping platform 325. The overlapping platform 325 is used to receive the sliding sleeve 312 and assist in supporting the manhole cover body 11 in the open state. A concave part 326 is fixed to the end of the inner wall of the slide plate 32 near the overlapping platform 325. A baffle plate 327 is hinged in the concave part 326 by a torsion spring. In the default state, the upper end surface of the baffle plate 327 is in contact with the bottom surface of one end of the overlapping platform 325, and the bottom surface of the inner wall of the slide plate 32, the slope surface 322 of the boss 321, the hinge plate 324 and the bottom surface of the overlapping platform 325 enclose and form a second slide. In actual use: When the handle 13 is manually held to lift the manhole cover body 11, the first pulley 24 and the second pulley 25 on the bottom surface of the manhole cover body 11 slide along the inner wall contact surface of the manhole frame 1, and at the same time the slide plate 32 slides along the inside of the guide box 31. After the slide plate 32 contacts the inner wall side of the guide box 31, when the manhole cover body 11 is lifted, the sliding sleeve 312 slides along the first slide in sequence past the plane of the boss 321, the hinge plate 324, and the support plate 323, and finally falls into the right angle groove of the overlapping platform 325. At this time, the manhole cover body 11 is supported by the overlapping platform 325 and maintains a stable lifting angle, without the need for continuous manual holding. When the manhole cover body 11 is closed, hold the handle 13 again and gently lift the manhole cover body 11 backward. The sliding sleeve 312 falls from the overlapping platform 325 onto the shielding plate 327. The shielding plate 327 is pressed and rotates downward. The sliding sleeve 312 slides along the second slide rail. At the same time, the hinge plate 324 is pressed and rotates upward. The shielding plate 327 is reset. Finally, the sliding sleeve 312 returns to the plane of the boss 321 as the manhole cover body 11 is closed, completing the reset.

[0030] Reference Figures 7-11 As shown, in order to avoid impurities from obstructing the sliding of the second pulley 25 and to ensure the smooth operation of the labor-saving mechanism 2, the inner wall of the well frame 1 has a contact plate 35 that contacts the second pulley 25; the support mechanism 3 also includes two sets of cleaning components, which are embedded in the bottom surface of the well cover body 11. The two sets of cleaning components correspond to the two sets of second pulleys 25 respectively and are used to remove impurities in front of the path of the second pulley 25. The cleaning assembly includes a fixed track 37, which is fixed to the bottom surface of the manhole cover body 11 via a connector 36. A right-angle bracket 38 is slidably fitted on the bottom surface of the fixed track 37. A return spring 371 is connected between the horizontal end of the right-angle bracket 38 and one end of the inner wall of the fixed track 37. A guide shaft is fixed at one end of the horizontal end of the right-angle bracket 38. The guide shaft passes through the return spring 371 and is movably inserted through the corresponding end of the fixed track 37. A bushing 391 is fixed to the bottom surface of the horizontal end of the right-angle bracket 38. A vertically arranged rotating shaft 39 is connected to the bushing 391 through a bearing. One end of the rotating shaft 39 movably passes through the horizontal end of the right-angle bracket 38 and is fixed with a gear 310. A rack 311 that meshes with the gear 310 is fixed to the side of the fixed track 37 through a bracket. One end of the rotating shaft 39 is connected to a protective sleeve 392 through a bearing. The two ends of the protective sleeve 392 are slidably engaged with the two sides of the fixed track 37 to protect the meshing area of ​​the gear 310 and the rack 311. The other end of the rotating shaft 39 is fixed with a scraper 393. The scraper 393 is in contact with the surface of the contact plate 35 and can rotate with the rotating shaft 39 to scrape away impurities on the contact plate 35.

[0031] To accommodate the second pulley 25 being opened synchronously with the manhole cover body 11, thus maintaining the preset position of the cleaning component and simultaneously realizing the rotation of the scraper 393 to remove impurities, an anti-detachment rod 381 is hinged to one end of the vertical end of the right-angle frame 38. The anti-detachment rod 381 is movably installed through the contact plate 35. An inclined groove 351 is provided on the contact plate 35, and a sliding sleeve 382 is sleeved on the anti-detachment rod 381. The sliding sleeve 382 is fitted against the bottom surface of the contact plate 35. A dovetail block 383 is integrally and symmetrically fixed on the surface of the sliding sleeve 382. A dovetail groove 353 is provided on the bottom surface of the contact plate 35 to slide and adapt to the dovetail block 383. The inclination of the dovetail groove 353 is consistent with that of the inclined groove 351, ensuring that the anti-detachment rod 381 slides along the inclined direction. A stop plate 352 is fixed on the contact plate 35. The stop plate 352 is used to prevent impurities from falling in and to block the slide plate 32. The side of the stop plate 35 that is close to the second pulley 25 is set as an inclined surface, and the inclination of the inclined surface is consistent with the inclination of the inclined groove 351, which can guide impurities to slide into the inner side of the well frame 1.

[0032] In actual use, when the operator holds the handle 13 to lift the manhole cover body 11, the second pulley 25 on the bottom surface of the manhole cover body 11 slides along the contact plate 35 on the inner wall of the manhole frame 1. The cleaning component moves synchronously with the manhole cover body 11: the anti-detachment rod 381 is guided by the inclined groove 351, which drives the right-angle frame 38 to slide in a straight line along the fixed track 37. At this time, the return spring 371 is compressed. At the same time, during the movement of the right-angle frame 38, the gear 310 meshes with the fixed rack 311, driving the rotating shaft 39 to rotate. The rotating shaft 39 drives the scraper 393 to rotate synchronously. The scraper 393 rotates against the surface of the contact plate 35, scraping away the impurities in front of the second pulley 25. The inclined surface of the stop platform 352 guides the scraped impurities to slide into the inner side of the manhole frame 1, avoiding accumulation in the slide area. The protective sleeve 392 slides with the right-angle frame 38, always protecting the meshing area of ​​the gear 310 and the rack 311, preventing impurities from entering and affecting the transmission. When the manhole cover body 11 is closed, the return spring 371 rebounds and pushes the right-angle bracket 38 to reset. The gear 310 meshes with the rack 311 in the opposite direction, causing the scraper 393 to rotate in the opposite direction, further cleaning the residual impurities on the surface of the contact plate 35. At the same time, the anti-detachment rod 381 slides back along the inclined groove 351, and the sliding sleeve 382 maintains sliding through the cooperation of the dovetail block 383 and the dovetail groove 353, ensuring that the cleaning component is reset to the initial position, preparing for the impurity cleaning when it is opened next time.

[0033] Working principle: First, the opening phase is based on the rolling friction transmission of the pulley assembly, combined with the hidden grip unit to optimize the ease of operation. When the manhole cover needs to be opened, the operator takes out the hidden U-shaped handle 13 through the receiving groove 121 of the overlapping cover 12 and applies an upward opening force to drive the manhole cover body 11 to rotate around the pivot 341 of the support block 34. At this time, the two sets of pulley assemblies symmetrically arranged on the bottom surface of the manhole cover body 11 move synchronously. The first pulley 24 on the front side comes out from the storage gap of the auxiliary unit, slides along the inclined surface of the ramp plate 22 and enters the preset path of the inner wall of the manhole frame 1. The limiting member 23 prevents the first pulley 24 from derailing laterally. The first pulley 24 on the rear side and the two sets of second pulleys 25 together form a rolling engagement with the contact plate 35 of the inner wall of the manhole frame 1. The opening resistance is reduced by rolling friction. At the same time, the supporting effect of the pulley assembly is used to offset part of the weight of the manhole cover body 11, so as to achieve effortless opening. When the handle 13 is not in use, it can be positioned and stored in the receiving groove 121 through the overlapping end 132 to ensure that the surface of the manhole cover is flat.

[0034] Secondly, during the support phase, the manhole cover body 11 achieves autonomous positioning through a sliding guide and mechanical limiting structure, eliminating the need for continuous manual gripping. During the opening process, the sliding plate 32 of the support mechanism 3 slides synchronously along the guide box 31 with the manhole cover body 11, and the guide rod 33 ensures the sliding guidance of the sliding plate 32. When the sliding plate 32 contacts the inner wall of the guide box 31 and achieves limiting, the rotating rod 313, linked to the movable part 314 on the bottom surface of the manhole cover body 11, drives the sliding sleeve 312 to slide along the first sliding track. Finally, the sliding sleeve 312 falls into the right-angle groove of the overlapping platform 325 at the end of the support plate 323, achieving mechanical limiting. The main body 11 of the manhole cover is supported to maintain the preset opening angle. When closing, the main body 11 of the manhole cover is gently lifted to make the sliding sleeve 312 disengage from the overlapping platform 325. The baffle plate 327 is pressed and rotates downward, guiding the sliding sleeve 312 to slide back along the second slide (bottom surface of the inner wall of the slide plate 32, the slope surface 322 of the boss 321, and finally pushing the hinge plate 324 upward). The hinge plate 324 and the baffle plate 327 are reset under the action of the torsion spring, and the sliding sleeve 312 returns to the plane of the boss 321 to complete the positioning.

[0035] Finally, during the operation phase, impurities are removed through the synchronous transmission of the cleaning components, ensuring the long-term smooth operation of the labor-saving mechanism 2. During the opening and closing of the manhole cover, the cleaning components move synchronously with the manhole cover body 11: when opening, the anti-detachment rod 381 at the vertical end of the right-angle frame 38 is guided by the inclined groove 351 of the contact plate 35, causing the right-angle frame 38 to slide along the fixed track 37 and compress the return spring 371; at the same time, during the movement of the right-angle frame 38, the gear 310 meshes with the rack 311 on the side of the fixed track 37, driving the rotating shaft 39 to rotate, and the scraper 393 rotates against the surface of the contact plate 35, removing impurities in front of the second pulley 25's path; The stop plate 352 on the contact plate 35 guides impurities to slide into the inner side of the well frame 1 through the inclined surface to avoid accumulation; the protective sleeve 392 slides with the right angle frame 38, always protecting the meshing area of ​​the gear 310 and the rack 311; when closed, the return spring 371 rebounds and pushes the right angle frame 38 to reset, and the sliding sleeve 382 cooperates with the dovetail groove 353 of the contact plate 35 through the dovetail block 383 to ensure the anti-detachment rod 381 slides back, ensuring the reset of the cleaning components and providing a clean slide environment for the next operation.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A pulley manhole cover, characterized in that: The system includes a manhole frame (1), on which a manhole cover body (11) is placed; one end of the manhole frame (1) is connected to an overlap cover (12), and the overlap cover (12) is provided with a gripping unit for manual gripping to assist in opening the manhole cover body (11); the bottom surface of the manhole cover body (11) is provided with a force-saving mechanism (2), and the force-saving mechanism (2) slides with the contact surface of the manhole frame (1); when a person opens the manhole cover body (11) through the gripping unit, the force-saving mechanism (2) can offset part of the weight of the manhole cover body (11) through the sliding action with the contact surface of the manhole frame (1), so as to achieve effortless opening; The labor-saving mechanism (2) includes at least two sets of pulley assemblies symmetrically arranged on the bottom surface of the manhole cover body (11). Each set of pulley assemblies includes two sets of first pulleys (24) and two sets of second pulleys (25). The first pulleys (24) and the second pulleys (25) are slidably engaged with the inner wall of the manhole frame (1). Corresponding to the two sets of first pulleys (24) on the front side of the manhole cover body (11), an auxiliary unit is also configured on one side of the inner wall of the manhole frame (1). The auxiliary unit is used to slide and guide the first pulleys (24) on the front side. It also includes a support mechanism (3) for supporting the manhole cover body (11) in the unfolded state. The support mechanism (3) includes two sets of guide boxes (31) with openings. The two sets of guide boxes (31) are respectively fixed to the corresponding sides of the inner wall of the manhole frame (1). A slide plate (32) is slidably fitted inside the guide box (31). A guide rod (33) is fixed on one side of the slide plate (32). The slide plate (32) is movably installed through one end of the guide box (31) through the guide rod (33) to realize the sliding of the slide plate (32) along the guide box (31). An extension plate is fixed on the side of the slide plate (32) away from the guide rod (33), and the extension plate is movably installed through the corresponding side of the guide box (31); a support block (34) is fixed on the upper surface of the extension plate, and a rotating shaft (341) is fixed on the side of the support block (34), and the manhole cover body (11) is rotatably sleeved between the two sets of rotating shafts (341); when the manhole cover body (11) is unfolded by the gripping unit, the first pulley (24) and the second pulley (25) on the bottom surface of the manhole cover body (11) slide along the inner wall contact surface of the manhole frame (1), and at the same time, the slide plate (32) slides synchronously along the inside of the guide box (31); The two sets of slide plates (32) are open on the side facing each other, and a boss (321) is integrally provided on the bottom surface of one side of its inner wall. The boss (321) has a ramp surface (322) and a plane. A support plate (323) is fixedly provided on the inner side of the slide plate (32). The upper surface of the support plate (323) is flush with the plane of the boss (321). A hinge plate (324) is hinged to one side of the support plate (323) by a torsion spring. In the default state, the upper surface of the hinge plate (324) is... The plane of the boss (321) and the upper surface of the support plate (323) are flush, and the three together with the top surface of the inner wall of the slide plate (32) form a first slide; a sliding sleeve (312) is slidably arranged in the first slide, and a pin is rotatably connected to the sliding sleeve (312) through a bearing. A rotating rod (313) is fixed at one end of the pin, and a movable part (314) is movably connected to the rotating rod (313). The movable part (314) is fixed at a near-central position on the bottom surface of the manhole cover body (11); The support plate (323) is connected to a downwardly extending right-angled overlapping platform (325) at the end away from the hinge plate (324). The overlapping platform (325) is used to receive the sliding sleeve (312) and assist in supporting the manhole cover body (11) in the open state. A concave part (326) is fixed to the end of the inner wall of the slide plate (32) near the overlapping platform (325). A baffle plate (327) is hinged in the concave part (326) by a torsion spring. In the default state, the upper end surface of the baffle plate (327) is in contact with the bottom surface of one end of the overlapping platform (325). The bottom surface of the inner wall of the slide plate (32), the slope surface (322) of the boss (321), the hinge plate (324) and the bottom surface of the overlapping platform (325) enclose to form a second slide.

2. A pulley manhole cover according to claim 1, characterized in that: The auxiliary unit includes two sets of auxiliary base plates (21) that correspond to and cooperate with the first pulley (24) on the front side. The auxiliary base plates (21) are fixed to the bottom surface of the inner wall of the well frame (1). A ramp plate (22) is connected to the auxiliary base plate (21), and a limiting member (23) is fixed on one side of the auxiliary base plate (21). A storage gap is formed between the limiting member (23) and the lower end of the ramp plate (22). The gap is used to accommodate the first pulley (24) on the corresponding side when the well cover body (11) is closed.

3. A pulley manhole cover according to claim 1, characterized in that: The overlapping cover (12) has a receiving groove (121), and the gripping unit includes a U-shaped handle (13). The handle (13) is adapted to be embedded in the receiving groove (121), and its two ends pass through the overlapping cover (12) and are fixed with anti-detachment ends (131). The anti-detachment ends (131) are used to restrict the handle (13) from detaching from the receiving groove (121). The bottom surface of the overlapping cover (12) is fixed with an overlapping end (132), and the handle (13) can be hidden in the receiving groove (121) and supported and positioned by the overlapping end (132).

4. A pulley manhole cover according to claim 1, characterized in that: The inner wall of the well frame (1) has a contact plate (35) that contacts the second pulley (25); the support mechanism (3) also includes two sets of cleaning components, which are embedded in the bottom surface of the well cover body (11). The two sets of cleaning components correspond to the two sets of second pulleys (25) respectively, and are used to remove impurities in front of the second pulley (25) travel path; the cleaning components include a fixed track (37), which is fixed to the bottom surface of the well cover body (11) by a connector (36); the bottom surface of the fixed track (37) is slidably fitted with a right angle frame (38), and a return spring (371) is connected between the horizontal end of the right angle frame (38) and one end of the inner wall of the fixed track (37). A guide shaft is fixed at one end of the horizontal end of the right angle frame (38), which passes through the return spring (371) and is movably connected through the corresponding end of the fixed track (37); A bushing (391) is fixedly provided on the bottom surface of the horizontal end of the right-angle frame (38). A vertically arranged rotating shaft (39) is connected inside the bushing (391) through a bearing. One end of the rotating shaft (39) movably passes through the horizontal end of the right-angle frame (38) and is fixedly provided with a gear (310). A rack (311) that meshes with the gear (310) is fixedly provided on the side of the fixed track (37) through a bracket. A protective sleeve (392) is connected to one end of the rotating shaft (39) through a bearing. The two ends of the protective sleeve (392) slide in cooperation with the two sides of the fixed track (37). A scraper (393) is fixedly provided at the other end of the rotating shaft (39). The scraper (393) contacts the surface of the contact plate (35).

5. A pulley manhole cover according to claim 4, characterized in that: One end of the vertical end of the right-angle frame (38) is hinged with an anti-detachment rod (381), which is movably connected through the contact plate (35). The contact plate (35) is provided with a slanted groove (351), and a sliding sleeve (382) is sleeved on the anti-detachment rod (381). The sliding sleeve (382) is fitted to the bottom surface of the contact plate (35). A dovetail block (383) is integrally and symmetrically fixed on the surface of the sliding sleeve (382). A dovetail groove (353) is provided on the bottom surface of the contact plate (35) to adapt to the sliding of the dovetail block (383), and the inclination of the dovetail groove (353) is consistent with that of the slanted groove (351). A stop platform (352) is fixed on the contact plate (35). The side of the stop platform (352) near the second pulley (25) is set as a slanted surface, and the inclination of the slanted surface is consistent with that of the slanted groove (351).

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