Well lid lifting device

Abstract

The invention provides a well lid extracting device. The well lid extracting device comprises a supporting platform; the adjustable support is arranged at the bottom of the supporting platform and used for supporting the supporting platform, the adjustable support comprises four mounting bases, a supporting device arranged between the mounting bases and the supporting platform and an adjusting device used for controlling the four mounting bases to move close to or away from each other, and universal wheels are arranged at the bottoms of the mounting bases; the lifting bracket is arranged on the supporting platform in a lifting manner; the lifting drive is arranged on the supporting platform and used for driving the lifting support to ascend and descend; one end of each traction rope is connected with the lifting support, the other end of each traction rope is provided with a hook used for fixing a well lid, and the four traction ropes are symmetrically arranged on the peripheral side of the lifting support; and the rope winding device is used for releasing or locking the traction rope. The effect of improving the flexibility of the well lid lifting device is achieved.

Description

Technical Field

[0001] The present application relates to the field of municipal engineering technology, and in particular to a manhole cover extraction device. Background Art

[0002] In order to enhance the landscape effect, many municipal roads and green belts use invisible manhole covers. When performing underground power and weak current maintenance, the manhole covers on the ground need to be opened. In order to ensure consistency with the surrounding landscape, invisible manhole covers will be filled with landscape objects such as stone or soil, which causes a sharp increase in weight, making it difficult to extract the manhole covers, resulting in inconvenience in subsequent maintenance work.

[0003] In order to avoid tripping passers-by, the invisible manhole cover changes the preset handle of the traditional manhole cover to a preset hole. Specifically, the holes are preset at the four corners of the manhole cover, which is convenient for both sewage discharge and extraction of the manhole cover. The traditional method is to manually lift the manhole cover with simple tools such as hooks, picks, and crowbars. The process is time-consuming and labor-intensive, and it is easy to cause damage to the manhole cover or injury to personnel due to improper operation of the staff. Therefore, some special devices for manhole cover extraction have appeared on the market. Most of the devices can only adapt to one specification of manhole cover, and the flexibility is poor, which makes it inconvenient to extract the municipal maintenance manhole cover. Summary of the invention

[0004] In order to improve the problem of poor flexibility of the manhole cover extraction device, the present application provides a manhole cover extraction device.

[0005] The present application provides a manhole cover extraction device that adopts the following technical solution: A manhole cover extraction device, comprising: Support platform; An adjustable bracket, arranged at the bottom of the support platform and used to support the support platform, comprising four mounting seats, a supporting device arranged between the mounting seats and the support platform, and an adjusting device for controlling the four mounting seats to move closer to or away from each other, and a universal wheel is provided at the bottom of the mounting seat; A lifting bracket, which can be lifted and lowered on the supporting platform; A lifting drive, which is arranged on the supporting platform and is used to drive the lifting bracket to rise and fall; A traction rope, one end of which is connected to the lifting bracket and the other end of which is provided with a hook for fixing the manhole cover, and four traction ropes are symmetrically provided around the lifting bracket; and A rope winding device is used to release or lock the traction rope.

[0006] Furthermore, the boost drive includes: A mounting frame, fixedly disposed on the supporting platform; A driving rod is rotatably arranged on the lifting bracket in a horizontal direction; The lifting screw rod is rotatably arranged on the support platform in the vertical direction and is connected to the driving rod through a worm and worm gear assembly; and The driving motor is fixedly arranged on the mounting frame, and the output end thereof is connected to one end of the driving rod; The lifting bracket includes a mounting frame, a threaded barrel and a guiding assembly. The threaded barrel is fixedly arranged in the middle of the mounting frame. The lifting screw rod is in threaded connection with the threaded barrel, and the guiding assembly is used for guiding the lifting of the mounting frame.

[0007] Furthermore, the guiding assembly includes a plurality of guiding rods. One end of each guiding rod is connected to the mounting frame, and the other end penetrates and protrudes from the support platform. A limiting plate is arranged at the end of the guiding rod protruding from the support platform.

[0008] Furthermore, a driving handwheel is fixedly arranged at the end of the driving rod away from the driving motor, and the rotating shaft of the driving motor can be manually rotated in the power-off state.

[0009] Furthermore, there are four sets of rope winding devices, which respectively correspond to four traction ropes. The rope winding device includes a winding drum and a locking assembly. One end of the winding drum is rotatably connected to the lifting bracket, and a limiting ring is fixedly arranged at the other end. The end of the traction rope away from the hook is fixedly connected to the winding drum. The limiting ring is used for restricting the traction rope wound on the winding drum to the winding drum, and the locking assembly is used for locking or releasing the winding drum.

[0010] Furthermore, the locking assembly includes a locking screw rod, a locking nut and a locking pad. The first end of the locking screw rod is in threaded connection with the lifting bracket, the locking nut is fixedly connected to the second section of the locking screw rod, and the locking pad is an elastic pad and is arranged on the side of the locking nut close to the lifting bracket.

[0011] Furthermore, the adjusting device includes two parallel first telescopic rods and two parallel second telescopic rods. Both ends of the first telescopic rods and the second telescopic rods are respectively connected to two different mounting seats. The first telescopic rods and the second telescopic rods are perpendicular to each other, and at least one of the first telescopic rods and the second telescopic rods is an actively driven telescopic rod.

[0012] Furthermore, the support assembly includes four support rods respectively mounted on four mounting seats. One end of each support rod is ball-jointed to the mounting seat, and the other end is ball-jointed to the mounting platform.

[0013] Furthermore, all four support rods are set as actively driven telescopic rods.

[0014] Furthermore, a third telescopic rod is provided between the first telescopic rod or the second telescopic rod and the support platform. The third telescopic rod is in a non-vertical state. One end of the third telescopic rod is ball-jointed to the first telescopic rod or the second telescopic rod, and the other end is ball-jointed to the support platform.

[0015] In summary, the present application includes at least one of the following beneficial technical effects: 1. By symmetrically arranging four towing ropes around the lifting bracket and releasing or locking the towing ropes through a rope winding device, the length of the towing ropes can be adjusted to a suitable length according to actual needs, so that the hooks at the ends of the towing ropes can be connected to the prefabricated holes of manhole covers of different specifications, and the manhole cover can be lifted by cooperating with the lifting drive, so as to flexibly adapt to the extraction of manhole covers of different specifications. At the same time, the adjusting device can control the four mounting seats to move closer to or away from each other, so that the distance between the bottom universal wheels can be flexibly adjusted to avoid different specifications of manhole covers, further improving the flexibility of the manhole cover extraction device of the present application. 2. By driving the drive rod and the lifting screw through the worm and gear linkage, and using the characteristic that the worm drives the turbine to rotate unidirectionally, it can not only play the role of driving the motor to drive and reverse, but also prevent the lifting screw from driving the drive rod to rotate in the reverse direction, indirectly realizing the locking of the lifting screw. Even in the event of a sudden power failure of the drive motor, the lifted manhole cover will not suddenly fall due to the reverse rotation of the lifting screw, improving the safety and stability of the device of the present application. And, a drive handwheel is provided at the other end of the drive rod, so that when the drive motor is powered off, the manhole cover can be extracted continuously through the drive handwheel, integrating electric and manual functions, and improving the operation flexibility. 3. By setting at least one of the first telescopic rod and the second telescopic rod as an active driving telescopic rod, the mounting seats can be controlled to move away from and close to each other, and the first telescopic rod and the second telescopic rod can be controlled separately, so that the connection lines of the four universal wheels form a rectangle. Cooperating with the release and locking of the towing ropes, it can flexibly adapt to rectangular manhole covers of different specifications, and can adjust the floor area of the manhole cover extraction device of the present application according to manhole covers of different sizes and shapes, further improving the flexibility of the present application. 4. By ball-jointing both ends of the support rod to the mounting seat and the support platform, the support rod can tilt according to the change of the position of the mounting seat; by setting the support rod as an active driving telescopic rod, the adjustment range of the mounting seat can be further increased, and when the drive motor fails and the drive handwheel is difficult to operate, the support rod can be used as a second lifting device to lift the entire support platform upward to lift the manhole cover in another way. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0018] Figure 2 It is a front view of an embodiment of the present application.

[0019] Figure 3 It is a schematic diagram of the structure of the lifting frame of an embodiment of the present application.

[0020] Figure 4 It is a schematic cross-sectional structure diagram of the rope winding device of an embodiment of the present application.

[0021] Figure 5 It is a schematic diagram of the overall structure when the adjustable bracket is in an embodiment of the present application.

[0022] Reference numerals: 1, support platform; 11, controller; 2, adjustable bracket; 21, mounting seat; 22, universal wheel; 23, adjusting device; 231, first telescopic rod; 232, second telescopic rod; 24, support device; 241, support rod; 3, lifting bracket; 31, mounting frame; 32, threaded cylinder; 33, guide rod; 34, limiting plate; 4, lifting drive; 41, mounting frame; 42, drive rod; 43, lifting screw; 44, worm and worm gear assembly; 45, drive motor; 46, drive handwheel; 5, traction rope; 51, hook; 6, rope winding device; 61, drum; 611, limiting ring; 62, locking assembly; 621, locking screw; 622, locking nut; 623, locking washer. Detailed implementation manners

[0023] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0024] An embodiment of the present application discloses a manhole cover extraction device. Referring to Figure 1 , the manhole cover extraction device includes: A support platform 1, configured as a rectangular plate; The adjustable support 2 is arranged at the bottom of the support platform 1 and is used to support the support platform 1. It includes four mounting seats 21, a support device 24 arranged between the mounting seats 21 and the support platform 1, and an adjusting device 23 for controlling the four mounting seats 21 to move closer to or away from each other. The mounting seats 21 are rectangular blocks, and universal wheels 22 are fixedly connected to the bottoms of the mounting seats 21 by bolts; The lifting support 3 is arranged on the support platform 1 in a liftable manner; The lifting drive 4 is arranged on the support platform 1 and is used to drive the lifting support 3 to lift; The towing rope 5 is made of steel wire rope. One end of it is connected to the lifting support 3, and the other end is provided with a hook 51 for fixing the manhole cover. Four of them are symmetrically arranged around the lifting support 3; and The rope winding device 6 is used to release or lock the towing rope 5.

[0025] When lifting the manhole cover, the rope winding device 6 is used to release or lock the towing rope 5, so that the towing rope 5 can be adjusted to a suitable length according to the size of the manhole cover, and the hook 51 at the end of the towing rope 5 is inserted into the prefabricated holes of manhole covers of different specifications for connection. Cooperating with the lifting drive 4 to lift the manhole cover, so as to flexibly adapt to the extraction of manhole covers of different specifications; at the same time, the adjusting device 23 can control the four mounting seats 21 to move closer to or away from each other, so that the distance of the universal wheels 22 at the bottom can be flexibly adjusted to avoid different specifications of manhole covers, further improving the flexibility of the manhole cover extraction device of the present application.

[0026] Specifically, please refer to Figure 2 , the lifting drive 4 includes a mounting frame 41, a drive rod 42, a lifting screw 43 and a drive motor 45. The mounting frame 41 is an inverted U-shaped frame body and is fixedly welded to the support platform 1; the drive rod 42 is horizontally arranged inside the mounting frame 41 and is rotatably connected to the mounting frame 41 through a bearing; the lifting screw 43 is vertically arranged on one side of the drive rod 42, and the bottom end penetrates and protrudes from the support platform 1 and is rotatably connected to the support platform 1 through a bearing; the drive rod 42 and the lifting screw 43 are connected through a worm and gear assembly 44. A worm is coaxially welded and fixed in the middle section of the drive rod 42, and the lifting screw 43 is fixedly connected with a worm gear through a pin key. The worm gear and the worm are always meshed to realize the linkage of the drive rod 42 and the lifting screw 43; the drive motor 45 is fixedly connected to the mounting frame 41 by bolts.

[0027] On the other hand, the lifting support 3 includes a mounting frame 31, a threaded cylinder 32 and a guiding assembly. The mounting frame 31 is a square frame. The threaded cylinder 32 is fixedly connected to the midpoints of the four sides of the mounting frame 41 through four cross beams. The lifting screw 43 penetrates through the threaded cylinder 32 and is threadedly connected to the threaded cylinder 32. The guiding assembly is used to guide the lifting of the mounting frame 31.

[0028] Thus, after the hook 51 at the end of the towing rope 5 is connected to the manhole cover, the driving motor 45 drives the driving rod 42 to rotate. Through the transmission of the worm and worm gear assembly, the lifting screw 43 rotates, causing the threaded cylinder 32 to move upward under the guidance of the guiding assembly due to the thread engagement force, thereby driving the lifting bracket 3 to rise steadily and realizing the extraction of the manhole cover. By linking the driving rod 42 and the lifting screw 43 through the worm and worm gear, and utilizing the characteristic that the worm drives the turbine to rotate unidirectionally, it can not only play the role of driving the driving motor 45 to reverse, but also prevent the lifting screw 43 from driving the driving rod 42 to rotate in the reverse direction, indirectly realizing the locking of the lifting screw 43, so that even in the event of a sudden power failure of the driving motor 45, the lifted manhole cover will not suddenly fall due to the reverse rotation of the lifting screw 43.

[0029] Among them, the guiding assembly includes four cylindrical guiding rods 33. The four guiding rods 33 are all arranged vertically and are respectively arranged at the four corners of the installation frame 31. One end of the guiding rod 33 is welded and fixed to the top surface of the installation frame 31, and the other end penetrates and protrudes from the support platform 1. And a limiting plate 34 is coaxially connected to the end of the guiding rod 33 protruding from the support platform 1. The limiting plate 34 is a circular plate. A screw rod is welded and fixed to the side of the limiting plate 34 close to the guiding rod 33. A threaded hole is provided on the limiting rod. The limiting plate 34 is threadedly connected to the guiding rod 33 through the screw rod. Through the limitation of the guiding rod 33, a relative displacement can occur between the threaded cylinder 32 and the lifting screw 43, and the limiting plate 34 can play a role in limiting the lifting bracket 3, so as to avoid the situation that the lifting bracket 3 falls excessively and causes damage to the manhole cover and injury to personnel when the manhole cover hits the ground.

[0030] Moreover, in order to further improve the flexible controllability of the lifting device, a driving handwheel 46 is welded and fixed to the end of the driving rod 42 far from the driving motor 45. The driving motor 45 adopts a non-braking motor, such as a common three-phase asynchronous motor, a DC brushless motor, etc. After the motor is powered off, the rotor can rotate freely; the driving motor 45 can also adopt a motor with a clutch. By disconnecting the connection between the motor and the rod through the mechanical clutch, the manual operation is not affected by the motor resistance after the driving motor 45 is powered off. When the driving motor 45 is in the power-off state, by manually applying force to control the driving handwheel 46 to continue driving the driving rod 42 to rotate, it combines electric and manual operation, and has relatively high operation flexibility.

[0031] On the other hand, please refer to Figure 3 and Figure 4, there are four sets of rope winding devices 6, which respectively correspond to four traction ropes 5. The rope winding device 6 includes a winding drum 61 and a locking assembly 62. One end of the winding drum 61 is rotatably connected to the mounting frame 31, and a limiting ring 611 is welded and fixed to the other end. The end of the traction rope 5 away from the hook 51 is wound and fixed on the winding drum 61. The limiting ring 611 can limit the traction rope 5 wound on the winding drum 61 on the winding drum 61 to prevent the traction rope 5 from axially disengaging from the winding drum 61. The locking assembly 62 is used to lock or release the winding drum 61.

[0032] Specifically, as Figure 4 shown, the locking assembly 62 includes a locking screw 621, a locking nut 622 and a locking pad 623. A threaded groove is provided at the position of the mounting frame 31 close to the locking screw 621. The locking screw 621 passes through the winding drum 61 and is threadedly connected to the mounting frame 31 through the threaded groove. The diameter of the locking screw 621 is smaller than the inner diameter of the winding drum 61; the locking nut 622 is welded and fixed to the end of the locking screw 621 away from the mounting frame 31 to facilitate the rotation of the locking screw 621; the locking pad 623 is made of an elastic material and can be made of rubber or silica gel.

[0033] Thus, when locking the winding drum 61, by rotating the locking screw 621, the locking pad 623 is moved closer to the winding drum 61 until the locking pad 623 abuts against the winding drum 61 to limit the rotation of the winding drum 61, thereby locking the winding drum 61.

[0034] The specific operation process of manhole cover extraction is as follows: first, rotate the locking screw 621 to release the winding drum 61, then connect the four hooks 51 to the prefabricated holes on the manhole cover respectively, then rotate the winding drum 61 to straighten the traction rope 5, and then rotate the locking screw 621 to make the locking pad 623 lock the winding drum 61 to achieve effective connection of the manhole cover, and then lift the manhole cover through the lifting drive 4.

[0035] On the other hand, please refer to Figure 1 and Figure 5 , the adjusting device 23 includes two parallel first telescopic rods 231 and two parallel second telescopic rods 232. Both ends of the first telescopic rod 231 and the second telescopic rod 232 are respectively fixed to two different mounting seats 21 through bolts. The first telescopic rod 231 is perpendicular to the second telescopic rod 232, that is, the two first telescopic rods 231 are two parallel sides of a rectangle, and the two second telescopic rods 232 are the other two parallel sides of the rectangle. In order to facilitate the control of the distance between the mounting seats 21, at least one of the first telescopic rod 231 and the second telescopic rod 232 is an actively driven telescopic rod, that is, at least one of the first telescopic rods 231 is a hydraulic telescopic rod or an electric push rod, and at least one of the second telescopic rods 232 is a hydraulic rod or an electric push rod.

[0036] Thus, by controlling the telescoping of the first telescopic rod 231 and the second telescopic rod 232, the movement of the mounting seats 21 away from and towards each other can be controlled, and the first telescopic rod 231 and the second telescopic rod 232 can be controlled separately, enabling the connection lines of the four universal wheels 22 to form a rectangle. In cooperation with the release and locking of the towing rope 5, it can flexibly adapt to rectangular manhole covers of different specifications, and can adjust the floor area of the manhole cover extraction device of the present application according to manhole covers of different sizes and shapes, further improving the flexibility of the present application.

[0037] To adapt to the distance changes of multiple mounting seats 21, the support assembly includes four support rods 241 respectively installed on the four mounting seats 21. One end of the support rod 241 is spherical hinged to the mounting seat 21, and the other end is spherical hinged to the mounting platform, enabling the support rod 241 to tilt according to the change in the position of the mounting seat 21.

[0038] In this embodiment, the support rod 241 is set as an actively driven telescopic rod, that is, the four support rods 241 are all set as hydraulic telescopic rods or electric push rods. Synchronously driving the telescoping of the four support rods 241 can increase the adjustable range between the mounting seats 21 and further improve the flexibility of the manhole cover extraction device of the present application. Moreover, when the drive motor 45 fails and it is difficult to lift a large - sized manhole cover by the drive handwheel 46, and the lengths of the first cross - bar and the second cross - bar are fixed and inconvenient, controlling the four support rods 241 to extend synchronously to raise the entire support platform 1 to lift the manhole cover in another way, thereby further improving the flexibility of the manhole cover extraction device of the present application. In other embodiments, the telescopic rod can also be set as a non - telescopic rod, and the adjustable range is smaller than that of this embodiment.

[0039] Since the adjustable range of the distance between the mounting seats 21 is relatively large, resulting in a certain decrease in the overall stability of the adjustable bracket 2, a third telescopic rod is provided between the first telescopic rod 231 or the second telescopic rod 232 and the support platform 1. Two third telescopic rods are respectively provided at the fixed end and the movable section of a single first telescopic rod 231 or second telescopic rod 232. One end of the third telescopic rod is spherical hinged to the first telescopic rod 231 or the second telescopic rod 232, and the other end is spherical hinged to the support platform 1. And the third telescopic rod is always in a non - vertical state, which can share a part of the vertical stress for the support rod 241, thereby improving the stability of the adjustable bracket 2.

[0040] It should be noted that a controller 11 is provided on the support platform 1. The controller 11 is electrically connected to the drive motor 45, the first telescopic rod 231, the second telescopic rod 232, and the support rod 241. The controller 11 includes a power supply module and a control unit. The power supply module is used to supply power to all the electrical appliances in this device. The control unit includes a control circuit board and control buttons. Through the control buttons, before the steel wire rope is connected to the manhole cover, the four support rods 241 are controlled to synchronously extend and retract, and the first telescopic rod 231 and the second telescopic rod 232 are controlled to extend and retract independently, so that the distance between the mounting seats 21 can just adapt to the contour of the manhole cover. After the towing rope 5 is connected to the manhole cover, the drive motor 45 is controlled to rotate or the four support rods 241 are controlled to synchronously extend, so that the lifting bracket 3 is raised to realize the extraction of the manhole cover.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A manhole cover extraction device, characterized in that, Comprising: A support platform; An adjustable bracket, arranged at the bottom of the support platform and used for supporting the support platform, including four mounting seats, a support device arranged between the mounting seats and the support platform, and an adjusting device for controlling the four mounting seats to move closer to or away from each other. Universal wheels are provided at the bottom of the mounting seats; A lifting bracket, which is arranged on the support platform in a liftable manner; A lifting drive, arranged on the support platform and used for driving the lifting bracket to lift and lower; A towing rope, one end of which is connected to the lifting bracket, and the other end is provided with a hook for fixing the manhole cover. Four towing ropes are symmetrically arranged on the periphery of the lifting bracket; and A rope winding device, used for releasing or locking the towing rope.

2. The manhole cover extraction device according to claim 1, characterized in that The lifting drive includes: A mounting frame, fixedly arranged on the support platform; A drive rod, rotatably arranged on the lifting bracket in the horizontal direction; A lifting screw rod, rotatably arranged on the support platform in the vertical direction and connected to the drive rod through a worm and worm wheel assembly; and A drive motor, fixedly arranged on the mounting frame, and the output end thereof is connected to one end of the drive rod; The lifting bracket includes a mounting frame, a threaded cylinder and a guiding component. The threaded cylinder is fixedly arranged in the middle of the mounting frame. The lifting screw rod is threadedly connected to the threaded cylinder, and the guiding component is used for guiding the lifting and lowering of the mounting frame.

3. The manhole cover extraction device according to claim 2, characterized in that, The guiding component includes a plurality of guiding rods. One end of each guiding rod is connected to the mounting frame, and the other end penetrates and protrudes from the support platform. A limiting plate is arranged at the end of the guiding rod protruding from the support platform.

4. The manhole cover extraction device according to claim 2, characterized in that, A drive handwheel is fixedly arranged at the end of the drive rod away from the drive motor, and the rotating shaft of the drive motor can be manually rotated in the power-off state.

5. The manhole cover extraction device according to claim 1, characterized in that Four groups of rope winding devices are provided and respectively correspond to the four towing ropes. The rope winding device includes a winding drum and a locking component. One end of the winding drum is rotatably connected to the lifting bracket, and a limiting ring is fixedly arranged at the other end. The end of the towing rope away from the hook is fixedly connected to the winding drum. The limiting ring is used for restricting the towing rope wound on the winding drum to the winding drum, and the locking component is used for locking or releasing the winding drum.

6. The manhole cover extraction device according to claim 5, characterized in that The locking component includes a locking screw rod, a locking nut and a locking washer. The first end of the locking screw rod is threadedly connected to the lifting bracket, the locking nut is fixedly connected to the second section of the locking screw rod, and the locking washer is an elastic washer and is arranged on the side of the locking nut close to the lifting bracket.

7. The manhole cover extraction device according to claim 1, characterized in that, The adjusting device includes two parallel first telescopic rods and two parallel second telescopic rods. Both ends of the first telescopic rods and the second telescopic rods are respectively connected to different two mounting seats. The first telescopic rods and the second telescopic rods are perpendicular to each other, and at least one of the first telescopic rods and the second telescopic rods is an actively driven telescopic rod.

8. The manhole cover extraction device according to claim 7, characterized in that, The support component includes four support rods respectively mounted on the four mounting seats. One end of each support rod is ball-jointed to the mounting seat, and the other end is ball-jointed to the mounting platform.

9. The manhole cover extraction device according to claim 8, wherein, All four support rods are set as actively driven telescopic rods.

10. The manhole cover extraction device according to claim 9, characterized in that, A third telescopic rod is arranged between the first telescopic rod or the second telescopic rod and the support platform. The third telescopic rod is in a non-vertical state. One end of the third telescopic rod is ball-jointed to the first telescopic rod or the second telescopic rod, and the other end is ball-jointed to the support platform.

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