Well lid vertical lifting device

Abstract

The invention relates to the technical field of well lid lifting, in particular to a well lid vertical lifting device which comprises a connecting frame, the connecting frame is of a U-shaped structure, a connecting ring is rotationally connected to the surface of the connecting frame, and a driving mechanism used for driving the connecting ring to rotate is arranged in the connecting frame. And a connecting rod is rotationally connected into the connecting ring. By arranging the air cylinder, the sliding rod and the lifting mechanisms, the well lid can be vertically lifted, the two lifting mechanisms can just correspond to two through holes of the well lid, and the distance between the two lifting mechanisms can be adjusted, so that the well lid lifting device can conveniently adapt to the distances of the through holes of well lids of different sizes, the operation convenience is improved, and the well lid lifting device is suitable for popularization and application. And the whole connecting ring and the lifted well lid can be turned over through the arranged driving mechanism, the well lid can be conveniently maintained in all directions, the lifted well lid can further rotate in the connecting ring through the connecting ring, and the operation convenience is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of manhole cover lifting, in particular to a manhole cover vertical lifting device. Background Art

[0002] A manhole cover is used to cover a deep well in a road or home to prevent people or objects from falling. It can be divided into metal manhole covers, high-strength fiber cement concrete manhole covers, resin manhole covers, etc. according to the material. They are generally round and can be used in green belts, sidewalks, motor vehicle lanes, docks, alleys, etc.

[0003] There are two situations for lifting the manhole cover, one is to open the manhole cover to operate the deep well, the other is to open the manhole cover to maintain the manhole cover itself, so a reasonable device is needed to lift the manhole cover, wherein the maintenance of the manhole cover is generally spraying paint to prevent corrosion and rust. When performing maintenance and lifting, the lifting mechanism not only needs to lift the manhole cover upward, but also needs to turn the manhole cover over to facilitate painting the bottom of the manhole cover. However, in the prior art, the lifting of the manhole cover is generally simply lifted upward, and the flipping and rotation functions cannot be achieved, which is inconvenient for maintenance operations on the manhole cover. Summary of the invention

[0004] The purpose of the present invention is to provide a manhole cover vertical lifting device, which solves the problem that the manhole cover is generally lifted simply by lifting it upwards, cannot be turned over and rotated, and is inconvenient to perform maintenance operations on the manhole cover.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A device for vertically lifting a manhole cover comprises a connecting frame, which is a U-shaped structure. A connecting ring is rotatably connected to the surface of the connecting frame. A driving mechanism for driving the connecting ring to rotate is arranged inside the connecting frame. A connecting rod is rotatably connected to the inside of the connecting ring. Two cylinders are fixedly installed on the surface of the connecting rod. The output ports of the two cylinders are fixedly installed with the same sliding rod. Two sliding blocks are slidably connected to the surface of the connecting rod. A lifting mechanism for lifting the manhole cover is arranged on the surfaces of the two sliding blocks, and the lifting mechanism is connected to the sliding rod.

[0006] Preferably, the lifting mechanism includes a moving block, which is slidably connected to the bottom end of the sliding rod, a vertical rod is fixedly installed on the bottom end of the moving block, a steel wire rope is fixedly installed on the bottom end of the vertical rod, an insertion rod is fixedly connected to the bottom end of the steel wire rope, a cross rod is fixedly installed on the surface of the insertion rod, and the vertical rod slides through the sliding block.

[0007] Preferably, the side wall of the connecting rod is rotatably connected to a first screw rod, the first screw rod is provided with two opposite threads with its midpoint as the dividing line, the two ends of the first screw rod are respectively threaded through two sliders, and a knob is fixedly installed on the surface of the first screw rod.

[0008] Preferably, two fixing rods are fixedly mounted on the top of the connecting rod, and both of the fixing rods slide through the sliding rod.

[0009] Preferably, a second screw is threaded through the center position of the surface of the connecting rod, the bottom end of the second screw is rotatably connected to a pressure plate, two limiting rods are fixedly installed on the surface of the pressure plate, both of the limiting rods slide through the connecting rod, and a handle is fixedly installed on the top end of the second screw.

[0010] Preferably, rotating shafts are fixedly installed on both sides of the connecting ring, and the connecting ring is rotatably connected to the connecting frame through two rotating shafts. The driving mechanism includes two transmission rods, and the two transmission rods are rotatably inserted in the interior of the connecting frame. Pulleys and worm gears are fixedly installed on the surfaces of the two transmission rods, and the two pulleys are connected by belt drive. Worm gears are fixedly installed on the surfaces of the two rotating shafts, and the two worm gears are respectively meshed with two worm gears, and a turning handle is fixedly installed on the end of the transmission rod.

[0011] Preferably, an annular groove is formed on the inner wall of the connecting ring, and both ends of the connecting rod are slidably connected to the annular groove to achieve a state in which the connecting rod and the connecting ring rotate relative to each other.

[0012] Preferably, a sleeve is fixedly mounted on the bottom end of the sliding block, the vertical rod slides through the sleeve, and the diameter of the insertion rod is matched to the inner diameter of the sleeve.

[0013] Preferably, four supporting legs are fixedly mounted on the bottom of the connecting frame, the bottom ends of the four supporting legs are rotatably connected to moving wheels, and a push handle is fixedly mounted on the surface of the connecting frame.

[0014] The present invention has at least the following beneficial effects: By setting up a cylinder, a sliding rod and a lifting mechanism, the manhole cover can be lifted vertically, and there are two groups of lifting mechanisms. The two groups of lifting mechanisms can just correspond to the two through holes of the manhole cover, and the distance between the two groups of lifting mechanisms can be adjusted, so as to adapt to the through hole distances of manhole covers of different sizes and improve the convenience of operation. The set driving mechanism can flip the entire connecting ring and the manhole cover after lifting, so as to facilitate all-round maintenance of the manhole cover. The lifted manhole cover can also be rotated in the connecting ring using the connecting ring, further improving the convenience of operation.

[0015] The vertical rod, wire rope and plug rod in the lifting mechanism are connected. The wire rope can make use of its softness during the installation of the manhole cover, so that the manhole cover can be manually aligned with the wellhead directly without moving the entire device for alignment. When lifting the manhole cover, the plug rod can be inserted into the casing for docking. It can not only lift the manhole cover but also support the flipping process of the manhole cover, thereby avoiding the phenomenon that the wire rope has no supporting force during the flipping process, resulting in poor stability and inability to flip.

[0016] By setting a pressure plate and using a second screw rod to drive the plate to move, the lifted manhole cover can be squeezed so that the manhole cover is squeezed between the pressure plate and the cross bar, so that the manhole cover cannot be fixed during the flipping process. When the manhole cover is completely flipped from the bottom to the top, the manhole cover can be supported, thereby facilitating the painting operation and enhancing the stability during the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0018] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 For the present invention Figure 1 Side view; Figure 3 It is a schematic diagram of the worm gear structure of the present invention; Figure 4 This is a schematic diagram of the connecting ring structure of the present invention; Figure 5 This is a schematic diagram of the connecting rod structure of the present invention; Figure 6 For the present invention Figure 5 Schematic diagram of the structure at A in the middle; Figure 7 It is a cross-sectional view of the slider of the present invention; Figure 8 It is a schematic diagram of the bottom structure of the slide bar of the present invention.

[0019] In the figure: 1. connecting frame; 2. supporting leg; 3. moving wheel; 4. push handle; 5. connecting ring; 6. worm gear; 7. rotating shaft; 8. connecting rod; 9. fixing rod; 10. sliding rod; 11. cylinder; 12. vertical rod; 13. first screw rod; 14. sliding block; 15. knob; 16. second screw rod; 17. limiting rod; 18. pressing plate; 19. moving block; 20. plug rod; 21. wire rope; 22. cross bar; 23. worm; 24. transmission rod; 25. pulley; 26. turning handle; 27. sleeve. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0023] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device for controlling a computer or the like.

[0024] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] Reference Figure 1-8A manhole cover vertical lifting device includes a connecting frame 1, the connecting frame 1 is a "U"-shaped structure, the surface of the connecting frame 1 is rotatably connected to a connecting ring 5, the interior of the connecting frame 1 is provided with a driving mechanism for driving the connecting ring 5 to rotate, the interior of the connecting ring 5 is rotatably connected to a connecting rod 8, the surface of the connecting rod 8 is fixedly installed with two cylinders 11, and the output ports of the two cylinders 11 are fixedly installed with the same sliding rod 10; Two sliders 14 are slidably connected to the surface of the connecting rod 8 . The surfaces of the two sliders 14 are both provided with lifting mechanisms for lifting the manhole cover, and the lifting mechanisms are connected to the sliding rod 10 .

[0026] During use, the device is first placed on top of the manhole cover, and then the lifting mechanism is used to connect the two through holes of the manhole cover. The cylinder 11 is started, and the cylinder 11 drives the slide bar 10 to move upward, and the slide bar 10 drives the lifting mechanism to move upward, thereby driving the manhole cover to be lifted vertically. The lifted manhole cover can drive the entire lifting mechanism and the manhole cover to flip under the action of the driving mechanism, so as to facilitate the painting operation on the bottom, and the manhole cover can be rotated. This rotation does not require the entire device to be moved when installing the manhole cover, and it can also be more convenient to align and install it at the wellhead, thereby improving the convenience of operation.

[0027] Furthermore, the lifting mechanism includes a moving block 19, which is slidably connected to the bottom end of the sliding rod 10, and a vertical rod 12 is fixedly installed at the bottom end of the moving block 19, and a steel wire rope 21 is fixedly installed at the bottom end of the vertical rod 12. The bottom end of the steel wire rope 21 is fixedly connected to a plug rod 20, and a cross bar 22 is fixedly installed on the surface of the plug rod 20. The vertical rod 12 slides through the slider 14. When the lifting mechanism is in use, the cylinder 11 drives the sliding rod 10 to move upward, and the sliding rod 10 drives the moving block 19 to move upward synchronously, the moving block 19 drives the vertical rod 12 to move upward, the vertical rod 12 drives the steel wire rope 21 to move upward, and the steel wire rope 21 drives the plug rod 20 to move upward. The cross bar 22 at the bottom end of the plug rod 20 can pass through the through hole of the manhole cover and be staggered from the through hole by rotation to achieve the purpose of lifting.

[0028] Furthermore, the side wall of the connecting rod 8 is rotatably connected to the first screw 13, and the first screw 13 is provided with two sections of opposite threads with its midpoint as the dividing line. The two ends of the first screw 13 are respectively threaded through the two sliders 14, and a knob 15 is fixedly installed on the surface of the first screw 13. Depending on the size of the manhole cover, the distance between the two through holes on the manhole cover is also different. At this time, the distance between the two lifting mechanisms needs to be adjusted accordingly. In the specific operation, it is only necessary to rotate the first screw 13 through the knob 15. The rotation of the first screw 13 can drive the two lifting mechanisms to slide in opposite directions at the bottom of the slide rod 10, so that the insertion rods 20 in the two lifting mechanisms can be inserted into the through holes of the manhole cover.

[0029] Furthermore, two fixing rods 9 are fixedly installed on the top of the connecting rod 8, and the two fixing rods 9 slide through the sliding rod 10. The two fixing rods 9 can make the sliding of the sliding rod 10 and the lifting mechanism in the vertical direction more stable.

[0030] Furthermore, a second screw 16 is threaded through the center position of the surface of the connecting rod 8, and a pressure plate 18 is rotatably connected to the bottom end of the second screw 16. Two limiting rods 17 are fixedly installed on the surface of the pressure plate 18, and the two limiting rods 17 slide through the connecting rod 8. A handle is fixedly installed on the top of the second screw 16. When the manhole cover needs to be flipped after being lifted, the handle can be manually turned, and the handle drives the second screw 16 to rotate. When the second screw 16 rotates, it will move between the connecting rod 8, thereby driving the pressure plate 18 to move synchronously. Under the restriction of the limiting rod 17, the pressure plate 18 will not rotate synchronously with the second screw 16 until the bottom of the pressure plate 18 contacts the manhole cover. At this time, the bottom of the manhole cover is supported by the cross bar 22 and the top is squeezed by the pressure plate 18, so that the manhole cover is fixed. After fixation, the driving mechanism is used to flip the entire connecting ring 5 to flip the manhole cover.

[0031] Furthermore, a rotating shaft 7 is fixedly installed on both sides of the connecting ring 5, and the connecting ring 5 is rotatably connected to the connecting frame 1 through the two rotating shafts 7. The driving mechanism includes two transmission rods 24, and the two transmission rods 24 are rotatably inserted in the interior of the connecting frame 1. The surfaces of the two transmission rods 24 are fixedly installed with pulleys 25 and worm gears 23, and the two pulleys 25 are connected by belt transmission. Worm wheels 6 are fixedly installed on the surfaces of the two rotating shafts 7, and the two worm gears 23 are respectively engaged with the two worm gears 6. A turning handle 26 is fixedly installed on the end of the transmission rod 24. When the driving mechanism is in use, the turning handle 26 is manually turned, and the turning handle 26 drives the transmission rod 24 to rotate, and the two transmission rods 24 drive the two worm gears 23 to rotate synchronously, and the two worm gears 23 drive the two worm gears 6 to rotate synchronously, and the two worm gears 6 drive the rotating shaft 7 and the connecting ring 5 to rotate, thereby realizing the flipping of the connecting ring 5, and then realizing the flipping of the manhole cover.

[0032] Furthermore, an annular groove is provided on the inner wall of the connecting ring 5, and the two ends of the connecting rod 8 are slidably connected to the annular groove to achieve a state in which the connecting rod 8 and the connecting ring 5 rotate relative to each other. In order to further facilitate maintenance or installation operations on the manhole cover, the connecting rod 8 can be directly rotated inside the connecting ring 5 to improve convenience.

[0033] Furthermore, a sleeve 27 is fixedly installed at the bottom end of the slider 14, and the vertical rod 12 slides through the sleeve 27. The diameter of the plug rod 20 is adapted to the inner diameter of the sleeve 27. A wire rope 21 is provided in the lifting mechanism. Since the wire rope 21 is softer and more manipulable, it is more convenient for the plug rod 20 and the cross bar 22 to pass through the through hole of the manhole cover, and it is also more convenient to install the manhole cover at the wellhead position. However, since the wire rope 21 is softer, when the cross bar 22 and the pressure plate 18 are used to fix and flip the manhole cover, the support The force will appear to be poor. In order to improve stability, after the cross bar 22 and the insertion rod 20 lift the manhole cover, it is necessary to continue to make the cylinder 11 drive the sliding rod 10 to move upward, so that the sliding rod 10 drives the vertical rod 12 to move upward, and the vertical rod 12 drives the wire rope 21 and the insertion rod 20 to move upward until the insertion rod 20 is inserted into the casing 27. At this time, the manhole cover is flipped over. Since the wire rope 21 is located inside the casing 27, the supporting force for the manhole cover flipping process can be provided by the casing 27 and the insertion rod 20, thereby improving the stability during flipping.

[0034] Furthermore, four supporting legs 2 are fixedly installed on the bottom of the connecting frame 1 , the bottom ends of the four supporting legs 2 are rotatably connected to moving wheels 3 , and a push handle 4 is fixedly installed on the surface of the connecting frame 1 .

[0035] In summary, during use, the device is first placed above the manhole cover, and then the lifting mechanism is connected to the two through holes of the manhole cover, and the cylinder 11 is started. The cylinder 11 drives the slide bar 10 to move upward, and the slide bar 10 drives the lifting mechanism to move upward, thereby driving the manhole cover to be lifted vertically. The lifted manhole cover can drive the entire lifting mechanism and the manhole cover to flip under the action of the driving mechanism, so as to facilitate the painting operation on the bottom, and the manhole cover can be rotated. This rotation does not require the entire device to be moved when installing the manhole cover, and it can also be more convenient to align and install it at the wellhead, thereby improving the convenience of operation. When the lifting mechanism is in use, the cylinder 11 drives the slide bar 10 to move upward, and the slide bar 10 drives the moving block 19 to move upward synchronously, and the moving block 19 drives the vertical rod 1 2 moves up, the vertical rod 12 drives the wire rope 21 to move up, and the wire rope 21 drives the insertion rod 20 to move up, and the cross bar 22 at the bottom end of the insertion rod 20 can pass through the through hole of the manhole cover and stagger the through hole by rotating to achieve the purpose of lifting. According to the size of the manhole cover, the distance between the two through holes on the manhole cover is also different. At this time, it is necessary to adjust the distance between the two lifting mechanisms accordingly. In the specific operation, it is only necessary to rotate the first screw rod 13 through the knob 15. The rotation of the first screw rod 13 can drive the two lifting mechanisms to slide in opposite directions at the bottom of the sliding rod 10, so that the insertion rods 20 in the two lifting mechanisms can be inserted into the through hole of the manhole cover. The two fixed rods 9 provided can make the sliding of the sliding rod 10 and the lifting mechanism in the vertical direction more stable. When the lifted manhole cover is to be flipped, the handle can be manually turned, and the handle drives the second screw 16 to rotate. When the second screw 16 rotates, it will move with the connecting rod 8, thereby driving the pressing plate 18 to move synchronously. Under the restriction of the limiting rod 17, the pressing plate 18 will not rotate synchronously with the second screw 16 until the bottom of the pressing plate 18 contacts the manhole cover. At this time, the bottom of the manhole cover is supported by the cross bar 22 and the top is squeezed by the pressing plate 18, so that the manhole cover is fixed. After fixation, the driving mechanism is used to flip the entire connecting ring 5 to flip the manhole cover. When the driving mechanism is in use, the turning handle 26 is manually turned, and the turning handle 26 drives the transmission rod 24 to rotate. The two transmission rods 24 drive the two worm gears 23 to rotate synchronously, and the two worm gears 23 drive the two The two worm gears 6 rotate synchronously, and the two worm gears 6 drive the rotating shaft 7 and the connecting ring 5 to rotate, thereby realizing the flipping of the connecting ring 5, and then realizing the flipping of the manhole cover. In order to further facilitate the maintenance or installation operation of the manhole cover, the connecting rod 8 can be directly rotated inside the connecting ring 5 to improve the convenience. A wire rope 21 is provided in the lifting mechanism. Since the wire rope 21 is softer and more manipulable, it is more convenient to insert the rod 20 and the cross bar 22 to pass through the through hole of the manhole cover, and it is also more convenient to install the manhole cover just at the wellhead position. However, because the wire rope 21 is softer, when the cross bar 22 and the pressure plate 18 are used to fix and flip the manhole cover, the supporting force will be poor. In order to improve the stability, after the cross bar 22 and the inserting rod 20 lift the manhole cover,It is necessary to continue to make the cylinder 11 drive the slide bar 10 to move upward, so that the slide bar 10 drives the vertical bar 12 to move upward, and the vertical bar 12 drives the wire rope 21 and the insertion rod 20 to move upward until the insertion rod 20 is inserted into the casing 27. At this time, the manhole cover is flipped. Since the wire rope 21 is located inside the casing 27, the supporting force for the manhole cover flipping process can be provided by the casing 27 and the insertion rod 20, thereby improving the stability during flipping.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A manhole cover vertical lifting device, characterized in that: The invention comprises a connecting frame (1), wherein the connecting frame (1) is a "U"-shaped structure, a connecting ring (5) is rotatably connected to the surface of the connecting frame (1), a driving mechanism for driving the connecting ring (5) to rotate is arranged inside the connecting frame (1), a connecting rod (8) is rotatably connected to the inside of the connecting ring (5), two cylinders (11) are fixedly mounted on the surface of the connecting rod (8), the output ports of the two cylinders (11) are fixedly mounted with the same sliding rod (10), the surface of the connecting rod (8) is slidably connected to two sliding blocks (14), the surfaces of the two sliding blocks (14) are both provided with a lifting mechanism for lifting the manhole cover, and the lifting mechanism is connected to the sliding rod (10).

2. A manhole cover vertical lifting device according to claim 1, characterized in that: The lifting mechanism comprises a moving block (19), wherein the moving block (19) is slidably connected to the bottom end of the sliding rod (10), a vertical rod (12) is fixedly installed at the bottom end of the moving block (19), a steel wire rope (21) is fixedly installed at the bottom end of the vertical rod (12), an insertion rod (20) is fixedly connected to the bottom end of the steel wire rope (21), a cross rod (22) is fixedly installed on the surface of the insertion rod (20), and the vertical rod (12) slides through the sliding block (14).

3. A manhole cover vertical lifting device according to claim 2, characterized in that: The side wall of the connecting rod (8) is rotatably connected to a first screw rod (13), the first screw rod (13) being provided with two sections of opposite threads with its midpoint as a dividing line, the two ends of the first screw rod (13) respectively threadedly penetrate two sliders (14), and a knob (15) is fixedly mounted on the surface of the first screw rod (13).

4. The manhole cover vertical lifting device according to claim 1, characterized in that: Two fixing rods (9) are fixedly mounted on the top of the connecting rod (8), and the two fixing rods (9) both slide through the sliding rod (10).

5. The manhole cover vertical lifting device according to claim 1, characterized in that: A second screw rod (16) is threadedly penetrated at the center position of the surface of the connecting rod (8); the bottom end of the second screw rod (16) is rotatably connected to a pressure plate (18); two limiting rods (17) are fixedly mounted on the surface of the pressure plate (18); both limiting rods (17) slide through the connecting rod (8); and a handle is fixedly mounted on the top end of the second screw rod (16).

6. The vertical lifting device for a manhole cover according to claim 1, characterized in that: Rotating shafts (7) are fixedly mounted on both sides of the connecting ring (5); the connecting ring (5) is rotatably connected to the connecting frame (1) via the two rotating shafts (7); the driving mechanism comprises two transmission rods (24); the two transmission rods (24) are rotatably inserted into the interior of the connecting frame (1); pulleys (25) and worm gears (23) are fixedly mounted on the surfaces of the two transmission rods (24); the two pulleys (25) are connected via a belt drive; worm gears (6) are fixedly mounted on the surfaces of the two rotating shafts (7); the two worm gears (23) are respectively meshed with the two worm gears (6); and a turning handle (26) is fixedly mounted on the ends of the transmission rods (24).

7. The manhole cover vertical lifting device according to claim 1, characterized in that: An annular groove is provided on the inner wall of the connecting ring (5), and both ends of the connecting rod (8) are slidably connected to the annular groove so that the connecting rod (8) and the connecting ring (5) can rotate relative to each other.

8. The manhole cover vertical lifting device according to claim 2, characterized in that: A sleeve (27) is fixedly mounted on the bottom end of the sliding block (14), the vertical rod (12) slides through the sleeve (27), and the diameter of the insertion rod (20) is matched to the inner diameter of the sleeve (27).

9. The manhole cover vertical lifting device according to claim 1, characterized in that: Four supporting legs (2) are fixedly mounted on the bottom of the connecting frame (1), the bottom ends of the four supporting legs (2) are rotatably connected to moving wheels (3), and a push handle (4) is fixedly mounted on the surface of the connecting frame (1).

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