A manhole cover lifting device for municipal construction and its usage method

Abstract

This invention provides a manhole cover lifting device and its method of use for municipal construction, comprising a frame with a lifting hole and casters at its bottom; a winch located at the top of the frame; a lifting rope wound around the winch, with its free end passing through the lifting hole; a first buffer ring, at least partially located inside the lifting hole and rotatably connected to the frame via a first hinge, the axis of the first hinge extending horizontally; and a second buffer ring, at least partially located outside the lifting hole and extending radially outward to the bottom surface of the frame. This invention effectively absorbs the sudden impact energy of the manhole cover during lifting due to corrosion or deformation, preventing the manhole cover from directly impacting the frame or injuring construction personnel, thereby reducing the risk of equipment damage and the incidence of safety accidents.

Description

Technical Field

[0001] This invention relates to the field of municipal construction technology, and in particular to a manhole cover lifting device and its usage method for municipal construction. Background Technology

[0002] Municipal construction refers to a series of engineering activities involved in the construction of urban infrastructure, including the construction and maintenance of urban roads, bridges, tunnels, rail transit, water supply and drainage systems, landscaping, environmental sanitation, lighting facilities, heating supply, gas supply, public transportation, as well as flood control and earthquake resistance projects. During municipal construction, workers frequently need to replace or repair manhole covers, which usually requires the use of appropriate lifting equipment to hoist the covers.

[0003] During the lifting of manhole covers, some covers may experience corrosion or structural deformation due to long-term use, requiring significantly increased force from the lifting equipment. This can easily cause the manhole cover to suddenly bounce up during lifting. This bounce can not only cause the cover to collide with the lifting equipment, resulting in significant mechanical damage, but it can also injure nearby construction workers, thus causing a safety accident. Summary of the Invention

[0004] The purpose of this invention is to provide a manhole cover lifting device and its usage method for municipal construction, thereby addressing the shortcomings in the aforementioned background technology.

[0005] The technical solution of this invention is: a manhole cover lifting device for municipal construction, comprising:

[0006] The frame has lifting holes and casters at its bottom end;

[0007] A winch, which is located at the top of the frame;

[0008] A hoisting rope, which is wound around the winch and has its free end passing through the hoisting hole;

[0009] A first buffer ring is at least partially disposed inside the lifting hole and is rotatably connected to the frame via a first hinge, the axis of which extends horizontally.

[0010] The second buffer ring is at least partially located outside the lifting hole and extends radially outward along the lifting hole to the bottom surface of the frame.

[0011] Preferably, the first buffer ring includes a plurality of fan-shaped buffer petals, which are arranged in a circular array around the center of the lifting hole.

[0012] Preferably, along the height direction of the manhole cover lifting device, the fan-shaped buffer flap includes a first arc-shaped plate, a sponge buffer layer, a second arc-shaped plate, and a rubber buffer layer connected in sequence. The first arc-shaped plate is located above the lifting hole and is connected to the first hinge.

[0013] Preferably, it also includes a limiting member, which extends radially along the annular buffer petal, with one end connected to the frame via a first rotating shaft and the other end pressed against the top surface of the annular buffer petal, the axis of the first rotating shaft extending along the height direction of the manhole cover lifting device.

[0014] Preferably, the frame includes a base plate and a U-shaped suspension frame with an opening facing the base plate. The winch is mounted on the suspension plate of the U-shaped suspension frame, and a suspension block is provided between the suspension plate and the base plate. The suspension block is provided with a movable block and a driving mechanism. The suspension plate and the movable block are respectively provided with a first rope hole and a second rope hole. The driving mechanism is connected to the movable block and can drive the movable block to move horizontally into or out of the U-shaped suspension frame.

[0015] Preferably, the drive mechanism includes a servo motor, a screw, a first gear, and a second gear. The servo motor is fixed to the suspension block, and its output end is connected to the first gear. The first gear and the second gear mesh, and the second gear is rotatably connected to the suspension block. The screw passes through and is threaded to the second gear, and the movable block is fixed to one end of the screw.

[0016] Preferably, it further includes a guide rod extending in the same direction as the screw, the guide rod and the screw respectively sliding through the suspension block, the movable block being fixed to one end of the screw, and the ends of the guide rod and the screw away from the movable block being connected by a linkage plate.

[0017] Preferably, the side end of the suspension block is provided with a protective cover, and the first gear and the second gear are at least partially located inside the protective cover.

[0018] Preferably, the frame is provided with a push handle at the side end.

[0019] Preferably, the hoisting rope includes a first rope segment and a second rope segment. The first rope segment is connected to the winch, and several second rope segments are detachably connected to the free ends of the first rope segment. Each free end of the second rope segment is provided with a hook.

[0020] The technical solution of the present invention also includes: a method of using the above-mentioned manhole cover lifting device for municipal construction, which includes the following steps:

[0021] Transfer the manhole cover lifting device used for municipal construction to the construction area so that the lifting hole corresponds to the manhole cover;

[0022] After connecting the lifting rope to the manhole cover, rotate the first buffer ring to fix the first buffer ring at the lifting hole;

[0023] The manhole cover was lifted by using a winch to wind up the rope.

[0024] The beneficial effects of this invention include: by setting a first buffer ring and a second buffer ring, the sudden impact energy of the manhole cover being lifted due to corrosion or deformation can be effectively absorbed, preventing the manhole cover from directly hitting the frame or injuring construction personnel, thereby significantly reducing the risk of equipment damage and the incidence of safety accidents. Furthermore, by setting a drive mechanism composed of a servo motor, screw, guide rod, and gear assembly, the lateral movement of the movable block can be precisely controlled, thereby driving the manhole cover to move smoothly above the base plate, realizing the temporary storage or direct unloading of the manhole cover; this drive mechanism has self-locking and stroke limit functions, which can prevent the screw from accidentally falling off, ensuring the safety and reliability of the operation process, while facilitating continuous operation of old manhole cover disassembly and new manhole cover installation, improving construction efficiency. Attached Figure Description

[0025] Figure 1 This is a front view of an embodiment of the present invention;

[0026] Figure 2 This is a longitudinal sectional view of an embodiment of the present invention;

[0027] Figure 3 This is an appendix to the embodiments of the present invention. Figure 2 Enlarged view of the structure at point A in the middle;

[0028] Figure 4 This is a perspective view of an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the connection between the driving mechanism and the movable block in an embodiment of the present invention.

[0030] In the picture:

[0031] 1. Frame; 1.1. Base plate; 1.11. Lifting hole; 1.2. U-shaped suspension frame; 1.21. Suspension plate; 1.22. First rope threading hole; 1.23. Side plate; 1.3. Suspension block; 1.4. Suspension arm;

[0032] 2. Casters;

[0033] 3. Winch;

[0034] 4. Suspension rope; 4.1. First rope segment; 4.2. Second rope segment;

[0035] 5. First buffer ring; 5.1. Fan-shaped buffer flap; 5.11. First arc-shaped plate; 5.12. Sponge buffer layer; 5.13. Second arc-shaped plate; 5.14. Rubber buffer layer;

[0036] 6. Second buffer ring;

[0037] 7. Push handle;

[0038] 8. First hinge component;

[0039] 9. Limiting components;

[0040] 10. First pivot;

[0041] 11. Movable block; 11.1. Second rope hole;

[0042] 12. Drive mechanism; 12.1. Servo motor; 12.2. Screw; 12.3. Guide rod; 12.4. Linkage plate; 12.5. First gear; 12.6. Second gear;

[0043] 13. Protective cover;

[0044] 14. Lifting hook. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0046] In the description of the embodiments of this invention, it should be understood that the terms "top," "bottom," etc., indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "set" and "connected" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention through specific circumstances.

[0047] Reference Appendix Figure 1-5 The present invention provides a manhole cover lifting device for municipal construction, which includes a frame 1, a moving wheel 2, a winch 3, a lifting rope 4, a first buffer ring 5, and a second buffer ring 6.

[0048] The frame 1 serves as the overall structural support for this device, providing installation support for the winch 3, lifting rope 4, first buffer ring 5, and second buffer ring 6. A lifting hole 1.11 is provided at the bottom of the frame 1, through which the lifting rope 4 passes. The diameter of the lifting hole 1.11 should be larger than that of a commonly used manhole cover. A push handle 7 is provided on the side of the frame 1, for workers to hold and move the device.

[0049] Multiple casters 2 are provided, and each caster 2 is installed at the bottom of the frame 1; each caster 2 is a swivel wheel with a self-locking function. The casters 2 are used to facilitate the movement of the frame 1 on the ground, and can lock the frame 1 in the target position through the self-locking function, thereby simultaneously meeting the needs of flexible transfer during construction and stable fixation during operation.

[0050] The winch 3 is used for lifting or lowering the manhole cover. Due to the significant weight of the manhole cover and the increased lifting resistance under corroded or deformed conditions, this embodiment uses a high-power winch 3 with a brake function. During implementation, the winch 3 is fixedly installed at the top of the frame 1, and the lifting rope 4 is wound around the winch 3, with the free end of the rope 4 hanging downwards and passing through the lifting hole 1.11 at the bottom of the frame 1. The high-power winch 3 provides sufficient lifting driving force to overcome the weight of the manhole cover and the additional resistance caused by corrosion and deformation; the brake function automatically locks the lifting rope 4 when the winch 3 stops operating, preventing the manhole cover from accidentally falling.

[0051] At least a portion of the first buffer ring 5 is disposed inside the lifting hole 1.11 and is rotatably connected to the frame 1 via the first hinge 8, the axis of which extends horizontally. Under the constraint of the first hinge 8, the first buffer ring 5 can rotate around the axis of the first hinge 8, thereby switching between being disengaged from or entering the lifting hole 1.11. The first hinge 8 is a hinge structure with a self-locking function, or an independent limiting measure is added to the frame 1 to fix the first buffer ring 5 in the lifting hole 1.11 during the use of this device.

[0052] The second buffer ring 6 is made of flexible material, and at least a portion of it is located outside the lifting hole 1.11 and extends radially outward along the lifting hole 1.11 to the bottom surface of the frame 1.

[0053] Based on the above structure, this device can at least be used to lift old manhole covers. The operation steps include: the construction worker holds the push handle 7 and uses the moving wheel 2 to move the device to the manhole cover to be lifted. By visual inspection, the lifting hole 1.11 is positioned directly above the manhole cover, and then the moving wheel 2 is locked; the winch 3 is started, the lifting rope 4 is lowered, and the construction worker connects the free end of the lifting rope 4 to the manhole cover to be lifted, and then the first buffer ring 5 is rotated and fixed so that at least a part of the first buffer ring 5 is in the lifting hole 1.11; the winch 3 is started again to wind up the lifting rope 4 and apply traction to lift the manhole cover.

[0054] During the above process, if the manhole cover is perfectly aligned with the lifting hole 1.11, the manhole cover will enter the lifting hole 1.11 and come into contact with the first buffer ring 5 after it leaves the ground. Even if the manhole cover suddenly bounces up, its impact energy will be absorbed by the first buffer ring 5. At the same time, the first buffer ring 5 can prevent the manhole cover from continuing to bounce outward, thereby avoiding damage to other parts of the device or collision injuries to construction personnel.

[0055] If there is a positional misalignment between the manhole cover and the lifting hole 1.11, the manhole cover will first contact the second buffer ring 6 on the bottom surface of the frame 1 when it leaves the ground. In this case, the impact energy generated by the manhole cover is absorbed by the second buffer ring 6, rather than directly impacting the frame 1, thereby effectively reducing the risk of damage to the frame 1 and improving the safety of the operation. Since multiple moving wheels 2 support the frame 1 above the ground, the bottom surface of the frame 1 is suspended relative to the ground. Therefore, the manhole cover has a certain suspension stroke after being lifted. In this case, the construction personnel can control the winch 3 to slightly lower the manhole cover, so that the manhole cover is released from contact with the second buffer ring 6. Then, the construction personnel can slightly push the manhole cover to correct its position, so that the manhole cover can smoothly enter the lifting hole 1.11 during the subsequent winding of the lifting rope 4 by the winch 3 and be temporarily stored in the lifting hole 1.11, thus providing convenient operating conditions for the replacement or maintenance of the manhole cover.

[0056] To facilitate construction operations, the first buffer ring 5 in this embodiment includes several fan-shaped buffer petals 5.1. These fan-shaped buffer petals 5.1 are arranged in a circular array around the center of the lifting hole 1.11. This split structure allows each fan-shaped buffer petal 5.1 to rotate independently, and gaps are formed between the multiple fan-shaped buffer petals 5.1 to allow the lifting rope 4 to pass through. This ensures that the rotation of the fan-shaped buffer petals 5.1 and the travel of the lifting rope 4 do not interfere with each other, which helps to improve the coordination of their movements and the convenience of operation during the lifting process.

[0057] Specifically, the first buffer ring 5 in this embodiment includes two fan-shaped annular buffer petals 5.1 in a semi-circular ring shape. Along the height direction of the device, each fan-shaped annular buffer petal 5.1 includes a first arc plate 5.11, a sponge buffer layer 5.12, a second arc plate 5.13, and a rubber buffer layer 5.14 connected in sequence. The first arc plate 5.11 is located above the lifting hole 1.11 and connected to the first hinge 8. The rubber buffer layer 5.14 is located at the bottom of the fan-shaped annular buffer petal 5.1. Through the aforementioned multi-layer composite structure, the sponge buffer layer 5.12 and the rubber buffer layer 5.14 can synergistically absorb the impact energy generated when the manhole cover bounces up. The rubber buffer layer 5.14, as the direct contact layer, has high wear resistance and elasticity, while the sponge buffer layer 5.12, as the intermediate layer, provides further compression energy absorption. The first arc-shaped plate 5.11 and the second arc-shaped plate 5.13 respectively endow the fan-shaped annular buffer petal 5.1 with overall structural strength and shape retention, thereby improving the durability and operational reliability of the fan-shaped annular buffer petal 5.1 while ensuring the buffering effect.

[0058] The specific selection of the first hinge member 8 can be determined according to actual usage requirements. For example, a hinge with a self-locking function or a common rotating shaft structure can be selected. This invention does not impose strict limitations on this. To ensure the positional stability of the fan-shaped buffer petal 5.1 during the impact process, this embodiment adopts a technical solution of adding additional limiting measures on the frame 1.

[0059] Specifically, a limiting member 9 is provided on the frame 1. The limiting member 9 is located above and outside the lifting hole 1.11 and extends outward along the radial direction of the fan-shaped annular buffer petal 5.1. One end of the limiting member 9 is connected to the frame 1 via a first rotating shaft 10, and the other end is used to form a pressing fit with the top surface of the fan-shaped annular buffer petal 5.1. The axis of the first rotating shaft 10 extends vertically (i.e., the height direction of the device). In use, the operator can release or restore the downward pressing effect of the limiting member 9 on the fan-shaped annular buffer petal 5.1 by horizontally rotating the limiting member 9 around the first rotating shaft 10.

[0060] In this embodiment, the first arc-shaped plate 5.11 is located above the lifting hole 1.11, and the outer diameter of the first arc-shaped plate 5.11 is larger than the diameter of the lifting hole 1.11. Therefore, when the fan-shaped annular buffer petal 5.1 rotates into the lifting hole 1.11, the bottom surface of the first arc-shaped plate 5.11 will contact the surface of the frame 1, thereby restricting the fan-shaped annular buffer petal 5.1 from moving further downward. Through the downward pressure provided by the limiting member 9 and the upward support provided by the frame 1, the fan-shaped annular buffer petal 5.1 is clamped and fixed from above and below, thereby ensuring the positional stability and buffering reliability of the fan-shaped annular buffer petal 5.1 under normal lifting and sudden impact conditions.

[0061] Since the impact force generated by the manhole cover on the first buffer ring 5 is along the height direction (i.e., vertical direction) of the device, and the extension direction of the first rotating shaft 10 is also along the height direction (vertical direction) of the device, the impact force direction is orthogonal to the rotational movement direction of the limiting member 9. Therefore, the vertical impact force of the manhole cover will not generate a horizontal torque around the first rotating shaft 10, and cannot drive the limiting member 9 to rotate, thus preventing the limiting member 9 from accidentally loosening due to impact. In addition, the preload between the limiting member 9 and the first rotating shaft 10 can be preset according to actual working conditions to ensure that the limiting member 9 remains stationary due to its own preload without applying a horizontal external force to rotate the limiting member 9 around the shaft, and will not rotate spontaneously. Through the above-mentioned orthogonal mechanical layout and preload setting, the limiting member 9 can always maintain a stable pressing state against the fan-shaped annular buffer petal 5.1, thereby effectively ensuring the positional stability of the fan-shaped annular buffer petal 5.1 within the lifting hole 1.11.

[0062] In addition to the above structure, the device further includes the following components: the frame 1 includes a base plate 1.1 and a U-shaped suspension frame 1.2 with an opening facing the base plate 1.1. The bottom end of the U-shaped suspension frame 1.2 is fixedly connected to the base plate 1.1, so that the frame 1 as a whole forms a structure that is open and unobstructed on opposite sides; for ease of explanation, the structure of the U-shaped suspension frame 1.2 is divided into a suspension plate 1.21 located at the top and two side plates 1.23 located below the suspension plate 1.21 and arranged opposite to each other. The winch 3 is mounted on the suspension plate 1.21, which has a first rope hole 1.22. A suspension block 1.3 is provided between the suspension plate 1.21 and the base plate 1.1. The suspension block 1.3 is connected to the suspension plate 1.21 by two oppositely arranged suspension arms 1.4, which correspond to the positions of the two side plates 1.23. A movable block 11 and a drive mechanism 12 are provided on the suspension block 1.3. A second rope hole 11.1 is provided on the movable block 11. The drive mechanism 12 is connected to the movable block 11 and can drive the movable block 11 to move horizontally into or out of the U-shaped suspension frame 1.2. After the hoisting rope 4 extends from the winch 3, it passes through the first rope hole 1.22 and the second rope hole 11.1 in sequence, and then hangs down and passes through the lifting hole 1.11 on the base plate 1.1.

[0063] Based on the above structure, this device can realize the transfer, temporary storage and unloading operations of manhole covers. During lifting, the fan-shaped annular buffer petal 5.1 is fixed in the lifting hole 1.11 to play a buffering role; after the manhole cover is lifted and moves smoothly, the fixing of the fan-shaped annular buffer petal 5.1 is released and it is rotated open, so that the fan-shaped annular buffer petal 5.1 is separated from the lifting hole 1.11, and the lifting rope 4 is continued to be wound to lift the manhole cover to a position higher than the base plate 1.1 of the frame 1. When temporary storage is required, first fix the annular buffer flap 5.1 back into the lifting hole 1.11 to ensure the top surface of the base plate 1.1 is flat and the structure is stable when pushing the device. Then, drive the movable block 11 to move horizontally through the drive mechanism 12, moving the lifting rope 4 and the manhole cover directly above other parts of the base plate 1.1. Lower the lifting rope 4 so that the base plate 1.1 directly supports the manhole cover, avoiding long-term stress on the lifting rope 4, which helps extend the service life of the lifting rope 4 and improves operational safety. At this point, the device can be transferred for transportation. After reaching the destination, use the drive mechanism 12 and the movable block 11 to move the manhole cover horizontally to the outside of the device and lower it to the ground. When direct unloading is required, keep the annular buffer flap 5.1 in the open state and directly move the manhole cover horizontally to the outside of the device through the movable block 11 and lower it to the ground.

[0064] In one feasible implementation, the drive mechanism 12 includes a servo motor 12.1, a screw 12.2, a guide rod 12.3, a linkage plate 12.4, a first gear 12.5, and a second gear 12.6. The servo motor 12.1 is fixedly mounted on the suspension block 1.3, and its output end is connected to the first gear 12.5. The first gear 12.5 meshes with the second gear 12.6, which is rotatably mounted on the suspension block 1.3. The second gear 12.6 can only rotate relative to the suspension block 1.3 and cannot move axially. The screw 12.2 passes through and is threaded onto the second gear 12.6, meaning the inner wall of the second gear 12.6 has threads. The screw 12.2 and the guide rod 12.3 extend in the same direction, both towards the opening side of the U-shaped suspension frame 1.2. The movable block 11 is fixed to the end of the screw 12.2 and guide rod 12.3 facing the opening side of the U-shaped suspension frame 1.2, and the linkage plate 12.4 is fixed to the end of the screw 12.2 and guide rod 12.3 away from the movable block 11. The guide rod 12.3 slides through the suspension block 1.3, and the screw 12.2 and the suspension block 1.3 are also in sliding fit.

[0065] The working principle of the above structure is as follows: After the servo motor 12.1 starts, it drives the first gear 12.5 to rotate. The first gear 12.5 drives the second gear 12.6, which meshes with it, to rotate as well. Since the second gear 12.6 can only rotate and cannot move on the suspension block 1.3, and the second gear 12.6 is threadedly engaged with the screw 12.2, the rotation of the second gear 12.6 generates a force that drives the screw 12.2 to move axially. At the same time, the guide rod 12.3 is connected to the screw 12.2 as a whole through the linkage plate 12.4, thereby restricting the rotational freedom of the screw 12.2 around its own axis. In this way, the screw 12.2 cannot rotate with the second gear 12.6, but can only move smoothly along its own axial direction. When the screw 12.2 moves, it drives the movable block 11 fixed at one end and the guide rod 12.3 connected through the linkage plate 12.4 to move synchronously, thereby realizing the lateral movement of the movable block 11. In addition, the movable block 11 and the linkage plate 12.4 together serve as a travel limit: when the screw 12.2 moves to the limit position, the movable block 11 or the linkage plate 12.4 will come into contact with the suspension block 13, thereby preventing the screw 12.2 from continuing to move and effectively preventing the screw 12.2 from accidentally falling off the suspension block 13.

[0066] In addition, a protective cover 13 is provided on the side end of the suspension block 1.3. At least a portion of the first gear 12.5 and the second gear 12.6 are located inside the protective cover 13, which provides protection. The screw 12.2 and the guide rod 12.3 slide through the protective cover 13 to ensure smooth movement.

[0067] As a feasible implementation, the lifting rope 4 includes a first rope segment 4.1 and a second rope segment 4.2. The first rope segment 4.1 is connected to the winch 3, and several second rope segments 4.2 are detachably connected to the free ends of the first rope segment 4.1. Each free end of the second rope segment 4.2 is equipped with a hook 14. Through this structure, several second rope segments 4.2 can be connected to different parts of the manhole cover, thereby achieving multi-point lifting. Multi-point lifting helps to distribute the tension on different parts of the manhole cover during the lifting process, reducing the risk of deformation of the manhole cover or detachment of connection points due to excessive local stress, while improving the posture stability and operational safety of the manhole cover during the lifting process.

[0068] In addition to dismantling old manhole covers, the device provided by this invention can also be directly applied to the lifting, transfer, and installation of new manhole covers, with an operation method similar to that of transferring and unloading old manhole covers. Specifically, the operator first moves the device to the storage area of ​​the new manhole cover, and then uses the drive mechanism 12 to drive the movable block 11 to move horizontally out of the device, so that the movable block 11 extends above the new manhole cover. Since the lifting rope 4 has been pre-passed through the first rope hole 1.22 and the second rope hole 11.1, at this time, it is only necessary to connect the free end of the lifting rope 4 to the new manhole cover, and then start the winch 3 to lift the new manhole cover. After the new manhole cover is lifted, the movable block 11 can be moved back into the device through the drive mechanism 12, and then the new manhole cover can be lowered and placed stably on the base plate 1.1 of the frame 1 for transfer; alternatively, the new manhole cover can be kept in the lifted state, and the device can be directly pushed to the target manhole position, and then the new manhole cover can be lowered to complete the installation. The above operating method allows this device to function in both the dismantling of old manhole covers and the installation of new manhole covers, which helps to improve construction efficiency and reduce the frequency of on-site equipment replacement.

[0069] Compared with the prior art, the beneficial effects of the present invention include: by setting the first buffer ring 5 and the second buffer ring 6, the sudden impact energy of the manhole cover due to corrosion or deformation during the lifting process can be effectively absorbed, avoiding the manhole cover from directly hitting the frame 1 or injuring construction personnel, thereby significantly reducing the risk of equipment damage and the incidence of safety accidents. In addition, by setting the drive mechanism 12, which consists of a servo motor 12.1, a screw 12.2, a guide rod 12.3 and a gear assembly, the lateral movement of the movable block 11 can be precisely controlled, thereby driving the manhole cover to move smoothly above the base plate 1.1, realizing the transfer and temporary storage or direct unloading of the manhole cover; the drive mechanism 12 has a self-locking and stroke limit function, which can prevent the screw 12.2 from accidentally falling off, ensuring the safety and reliability of the operation process, while facilitating the continuous operation of old manhole cover disassembly and new manhole cover installation, improving construction efficiency.

[0070] The above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A manhole cover lifting device for municipal construction, characterized in that, include: The frame has lifting holes and casters at its bottom end; A winch, which is located at the top of the frame; A hoisting rope, which is wound around the winch and has its free end passing through the hoisting hole; A first buffer ring is at least partially disposed inside the lifting hole and is rotatably connected to the frame via a first hinge, the axis of which extends horizontally. The second buffer ring is at least partially located outside the lifting hole and extends radially outward along the lifting hole to the bottom surface of the frame.

2. The manhole cover lifting device for municipal construction according to claim 1, characterized in that, The first buffer ring includes several fan-shaped buffer petals, which are arranged in a circular array around the center of the lifting hole.

3. The manhole cover lifting device for municipal construction according to claim 2, characterized in that, Along the height direction of the manhole cover lifting device, the fan-shaped buffer petal includes a first arc-shaped plate, a sponge buffer layer, a second arc-shaped plate, and a rubber buffer layer connected in sequence. The first arc-shaped plate is located above the lifting hole and is connected to the first hinge.

4. The manhole cover lifting device for municipal construction according to claim 2, characterized in that, It also includes a limiting member that extends radially along the annular buffer petal, with one end connected to the frame via a first rotating shaft and the other end pressed against the top surface of the annular buffer petal. The axis of the first rotating shaft extends along the height direction of the manhole cover lifting device.

5. The manhole cover lifting device for municipal construction according to any one of claims 1-4, characterized in that, The frame includes a base plate and a U-shaped suspension frame with an opening facing the base plate. The winch is mounted on the suspension plate of the U-shaped suspension frame, and a suspension block is provided between the suspension plate and the base plate. The suspension block is provided with a movable block and a driving mechanism. The suspension plate and the movable block are respectively provided with a first rope hole and a second rope hole. The driving mechanism is connected to the movable block and can drive the movable block to move horizontally into or out of the U-shaped suspension frame.

6. The manhole cover lifting device for municipal construction according to claim 5, characterized in that, The drive mechanism includes a servo motor, a screw, a first gear, and a second gear. The servo motor is fixed to the suspension block, and its output end is connected to the first gear. The first gear and the second gear mesh, and the second gear is rotatably connected to the suspension block. The screw passes through and is threaded to the second gear, and the movable block is fixed to one end of the screw.

7. The manhole cover lifting device for municipal construction according to claim 6, characterized in that, It also includes a guide rod extending in the same direction as the screw, the guide rod and the screw respectively sliding through the suspension block, the movable block being fixed to one end of the screw, and the ends of the guide rod and the screw away from the movable block being connected by a linkage plate.

8. The manhole cover lifting device for municipal construction according to claim 6, characterized in that, The suspension block is provided with a protective cover on its side, and the first gear and the second gear are at least partially located inside the protective cover.

9. The manhole cover lifting device for municipal construction according to claim 1, characterized in that, The frame is provided with a push handle on its side; the hoisting rope includes a first rope segment and a second rope segment, the first rope segment is connected to the winch, and several second rope segments are detachably connected to the free ends of the first rope segment, and each free end of the second rope segment is provided with a hook.

10. The method of using the manhole cover lifting device for municipal construction as described in any one of claims 1-9, characterized in that, Including the following steps: Transfer the manhole cover lifting device used for municipal construction to the construction area so that the lifting hole corresponds to the manhole cover; After connecting the lifting rope to the manhole cover, rotate the first buffer ring to fix the first buffer ring at the lifting hole; The manhole cover was lifted by using a winch to wind up the rope.

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