A cable well lid auxiliary moving-away device based on automatic correction and a correction method

Abstract

The present application relates to cable manhole cover hoisting technology field, specifically to a kind of cable manhole cover auxiliary removal device and correction method based on automatic correction, comprising: hoisting device, hoisting device is connected with auxiliary lifting mechanism;The auxiliary lifting mechanism includes: connecting frame, setting on the hoisting device, connecting frame is connected with rotating lifting assembly, and rotating lifting assembly is built-in locking disc;Pull cable, multiple groups are provided and equidistantly connected to rotating lifting assembly;Embrace structure, setting on the rotating lifting assembly and with the locking disc adaptation, when the cable manhole cover is lifted, the embrace structure can lock the locking disc;Top cock assembly, the end of the pull cable away from rotating lifting assembly is connected, the top cock assembly connects the handle hole of cable manhole cover and is in abutment with cable manhole cover outside ground, improve the stability when cable manhole cover moves away.

Description

Technical Field

[0001] This invention relates to the field of cable manhole cover lifting technology, specifically to an automatic correction-based auxiliary removal device and correction method for cable manhole covers. Background Technology

[0002] During routine inspections, maintenance, and emergency repairs of power grid lines, maintenance personnel often need to remove cable manhole covers to carry out underground operations. Since cable manhole covers are mostly made of cast iron or concrete, they are heavy and exposed to the outdoor environment for a long time. Due to the accumulation of mud and sand, corrosion and adhesion, and deformation caused by vehicle running over them, a large jamming force is easily formed between the manhole cover and the manhole ring, making it difficult to open them manually. Usually, lifting equipment is needed to assist in moving them.

[0003] However, in actual operation, existing lifting devices often fail to align the lifting point of the lifting sling with the handle hole on the manhole cover. The sling is often in an skewed state in the initial stage, meaning that the plane of the sling is not coplanar with the central axis of the manhole cover. When the manhole cover separates from the manhole ring, the upward pulling force decreases, causing the elastic rebound and shaking of the sling and the restoring torque impact of the skewed sling. The superposition of these two unstable effects causes the manhole cover to experience multiple degrees of freedom instability, such as jumping up and down and reciprocating rotation around the vertical axis, the moment it is separated from the manhole ring. This makes it difficult to maintain a controllable posture of the manhole cover from the time it is lifted to the time it is moved to the construction vehicle. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic correction-based auxiliary removal device and correction method for cable manhole covers, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automatic correction-based auxiliary removal device for cable manhole covers, comprising: a lifting device, wherein an auxiliary lifting mechanism is connected to the lifting device; the auxiliary lifting mechanism comprises: a connecting frame disposed on the lifting device, wherein a rotating lifting assembly is connected to the connecting frame, and the rotating lifting assembly has a built-in locking disc; a pull cable, wherein multiple sets are disposed and equidistantly connected to the rotating lifting assembly, and the pull cable can rotate and rise relative to the connecting frame under the action of the rotating lifting assembly; and a clamping structure disposed on the rotating lifting assembly and adapted to the locking disc, wherein when the cable manhole cover is lifted, the clamping structure can lock the locking disc.

[0006] As described above, the cable manhole cover auxiliary removal device based on automatic correction includes a rotary lifting assembly comprising multiple sets of hydraulic cylinders fixedly mounted on the connecting frame, a drive frame connected to the actuating end of the hydraulic cylinder, and a clamping structure disposed on the drive frame.

[0007] As described above, the cable manhole cover auxiliary removal device based on automatic correction includes a rotary lifting assembly that is concentric and parallel to the drive frame. The rotary platform is provided with multiple sets of grooved wheels, which roll in cooperation with annular protrusions on the drive frame. The locking disc is coaxially and fixedly connected to the rotary platform.

[0008] As described above, the cable manhole cover auxiliary removal device based on automatic correction includes a clamping structure comprising multiple sets of electric telescopic rods equidistantly mounted on the drive frame. An arc-shaped component is connected to the actuating end of the electric telescopic rod, and a resistance-increasing plate is provided on the side of the arc-shaped component away from the electric telescopic rod. The resistance-increasing plate is adapted to the locking disc.

[0009] The cable manhole cover auxiliary removal device based on automatic correction as described above further includes a lifting assembly connected to one end of the pulling cable away from the rotating lifting assembly. The lifting assembly is connected to the handle hole of the cable manhole cover and abuts against the ground outside the cable manhole cover.

[0010] The cable manhole cover auxiliary removal device based on automatic correction as described above: the lifting assembly includes: a lifting rod, rotatably connected to the pulling cable, with a roller rotatably mounted on the end of the lifting rod away from the pulling cable; a pulling frame, rotatably mounted on the lifting rod; and a cross-shaped limiting structure, disposed on the pulling frame, the cross-shaped limiting structure being able to extend into the handle hole of the cable manhole cover and lock.

[0011] As described above, in the automatic correction-based cable manhole cover auxiliary removal device: the rotatable connection between the pulling frame and the lifting rod is located at the end of the lifting rod away from the pulling cable.

[0012] The cable manhole cover auxiliary removal device based on automatic correction as described above: the cross-limiting structure includes a switching sleeve rotatably mounted on the pulling frame, and a protrusion is provided at the lower end of the switching sleeve; the lower end of the pulling frame is also provided with two sets of stop parts, and the line connecting the two sets of stop parts is perpendicular or parallel to the length direction of the protrusion; the cross-limiting structure also includes an elastic abutment kit for limiting the rotation degree of the switching sleeve.

[0013] As described above, the cable manhole cover auxiliary removal device based on automatic correction includes: the elastic abutment kit includes a spring telescopic rod fixedly installed on the traction frame, the actuating end of the spring telescopic rod is connected to a horizontal plate, the horizontal plate is connected to a lifting shaft that passes through the switching sleeve, and the lifting shaft is provided with a convex shaft; the elastic abutment kit also includes four sets of spiral extensions provided on the inner wall of the switching sleeve, and the connection between two adjacent sets of spiral extensions forms a recess or a protrusion.

[0014] A method for correcting a cable manhole cover using the aforementioned automatic correction-based cable manhole cover auxiliary removal device includes the following steps: Step 1: Control the lifting device to position the auxiliary lifting mechanism directly above the cable manhole cover to be removed, and then lower the auxiliary lifting mechanism to the predetermined height; Step 2: Insert the lifting assembly into the handle hole of the cable manhole cover and make the lifting assembly abut against the ground outside the cable manhole cover; Step 3: Control the movement of the rotating lifting component to tighten the traction cable. During the tightening process, the rotating lifting component rotates actively so that the plane where the traction cable is located passes through the central axis of the cable manhole cover to be removed. Step 4: The engaging structure engages to lock the rotating lifting component; Step 5: The rotating lifting assembly reverses its movement to push out the cable manhole cover to be removed.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: by setting up a rotating lifting component and a clamping structure, the rotating platform can rotate relative to the drive frame before lifting the cable manhole cover. This allows the rotating platform to rotate automatically when the cable manhole cover is lifted, driven by the tension of the traction cable, until the traction cable and the central axis of the cable manhole cover are coplanar. This prevents the cable manhole cover from undergoing impact-induced reciprocating rotation when it is moved out. After the cable manhole cover is moved out, the rotating platform can be locked, making the state of the cable manhole cover more controllable during the process of being moved to the construction vehicle, and improving the stability of the cable manhole cover during the moving and transfer process.

[0016] By using a lifting assembly, the cable manhole cover can more easily overcome the adhesive force between itself and the structural components under the lever principle, thus improving the separation effect between the cable manhole cover and the structural components. At the same time, the force provided by the hydraulic cylinder can be reduced, thereby further reducing the impact acceleration at the moment of separation between the manhole cover and the structural components and improving the stability during the separation process. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an automatic correction-based cable manhole cover auxiliary removal device. Figure 2 This is a schematic diagram of the structure after the lifting device is removed in the cable manhole cover auxiliary removal device based on automatic correction; Figure 3 This is a schematic diagram of the rotating lifting component and the clamping structure in the cable manhole cover auxiliary removal device based on automatic correction; Figure 4 This is a schematic diagram of the lifting component in an automatic correction-based cable manhole cover auxiliary removal device; Figure 5An exploded view of the elastic abutment kit in an automatic correction-based cable manhole cover auxiliary removal device; Figure 6 This is a cross-sectional view of the switching sleeve in an automatic correction-based cable manhole cover auxiliary removal device; Figure 7 This is a schematic diagram showing the state in which the line connecting the two sets of stops in the cable manhole cover auxiliary removal device based on automatic correction is perpendicular or parallel to the length direction of the protrusion.

[0018] In the diagram: 1. Lifting device; 2. Connecting frame; 3. Hydraulic cylinder; 4. Drive frame; 401. Annular protrusion; 5. Rotary table; 6. Grooved wheel; 7. Electric telescopic rod; 8. Arc-shaped component; 9. Resistance plate; 10. Locking disc; 11. Pulling cable; 12. Lifting rod; 13. Roller; 14. Pulling frame; 1401. Stop part; 15. Spring telescopic rod; 16. Horizontal plate; 17. Switching sleeve; 1701. Protrusion; 1702. Spiral extension part; 1703. Recess; 1704. Protrusion; 18. Lifting shaft; 1801. Convex shaft. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Please see Figures 1-7 As an embodiment of the present invention, the cable manhole cover auxiliary removal device based on automatic correction includes: a lifting device 1, which can be installed on a construction vehicle, and an auxiliary lifting mechanism connected to the lifting device 1. The auxiliary lifting mechanism includes: a connecting frame 2, a pulling cable 11, a clamping structure and a lifting component.

[0021] The connecting frame 2 is mounted on the lifting device 1, and a rotating lifting assembly is connected to the connecting frame 2. The rotating lifting assembly has a built-in locking disc 10. The rotating lifting assembly includes multiple sets of hydraulic cylinders 3 fixedly mounted on the connecting frame 2. A drive frame 4 is connected to the actuating end of the hydraulic cylinder 3. The clamping structure is mounted on the drive frame 4. During the initial removal of the cable manhole cover, the manhole cover and its matching structural components are often difficult to separate due to mud and sand blockage, rust adhesion, physical deformation caused by vehicle crushing, etc. If the lifting device 1 is used directly for lifting, the lifting device 1 may experience a sudden decrease in force at the moment of separation between the manhole cover and the structural components, which may cause the manhole cover to bounce or shake momentarily, affecting the stability of the initial lifting. Therefore, in this application, the initial removal process of the manhole cover is powered by the hydraulic cylinder 3. This can reduce the impact acceleration at the moment of separation between the manhole cover and the structural components, making the separation process smoother, thereby suppressing shaking, making the separation process more controllable, and improving the stability of the manhole cover after separation from the structural components to a certain extent.

[0022] The rotary lifting assembly also includes a rotary table 5 that is concentric and parallel to the drive frame 4. The rotary table 5 is provided with multiple sets of grooved wheels 6, which roll in cooperation with the annular protrusions 401 provided on the drive frame 4. Multiple sets of traction cables 11 are provided and are equidistantly connected to the rotary table 5. The locking disc 10 is coaxially and fixedly connected to the rotary table 5.

[0023] In the initial state, when the construction vehicle stops at the predetermined position and the drive frame 4 and the rotating platform 5 descend to the predetermined position, the connection between the pull cable 11 and the rotating platform 5 may be misaligned with the handle hole of the cable manhole cover. That is, the central axis of the pull cable 11 and the cable manhole cover are not coplanar. However, during the lifting of the cable manhole cover, the pull cable 11 will be subjected to tensile force and become taut. During the tautness process, the pull cable 11 can provide a certain rotational torque to the rotating platform 5, causing the rotating platform 5 to actively rotate to a state where the central axis of the pull cable 11 and the cable manhole cover are colinear. In this way, at the moment the cable manhole cover is removed, the cable manhole cover will not cause an impact reciprocating rotation due to the automatic alignment of the pull cable 11, thus improving the stability of the cable manhole cover during the removal process.

[0024] Please see Figures 2-3 The clamping structure is disposed on the rotary lifting assembly and adapted to the locking disc 10. When the cable manhole cover is lifted, the clamping structure can lock the locking disc 10. The clamping structure includes multiple sets of electric telescopic rods 7 circumferentially and equidistantly mounted on the drive frame 4. An arc-shaped component 8 is connected to the actuating end of the electric telescopic rod 7. A resistance-increasing plate 9 is disposed on the side of the arc-shaped component 8 away from the electric telescopic rod 7. The resistance-increasing plate 9 is adapted to the locking disc 10.

[0025] In the initial state, the electric telescopic rod 7 controls the resistance plate 9 to be separated from the locking plate 10. At this time, during the process of lifting the cable manhole cover, the rotating table 5 can rotate relative to the drive frame 4, thereby eliminating the impact reciprocating rotation of the cable manhole cover after it is removed, and ensuring the stability of the cable manhole cover during the removal process.

[0026] After the cable manhole cover is separated from the structural components, the electric telescopic rod 7 will drive the arc-shaped component 8 to move toward the locking disc 10 until the resistance plate 9 abuts against the locking disc 10. At this time, the locking disc 10 and the rotating table 5 are in a locked state, which makes the state of the cable manhole cover more controllable under the connection of the pulling cable 11. This prevents the cable manhole cover from rotating during the process of transferring it to the construction vehicle, which would cause the cable manhole cover to slip between itself and the corresponding support component when placed on the construction vehicle.

[0027] Based on the above configuration, the rotating platform 5 can rotate relative to the drive frame 4 before lifting the cable manhole cover. This allows the rotating platform 5 to rotate automatically when the cable manhole cover is lifted, thanks to the tension of the traction cable 11, until the traction cable 11 is coplanar with the central axis of the cable manhole cover. This prevents the cable manhole cover from rotating violently during the moment it is moved out. After the cable manhole cover is moved out, the rotating platform 5 can be locked, making the state of the cable manhole cover more controllable during the process of being moved to the construction vehicle and improving the stability of the cable manhole cover during the removal and transfer process.

[0028] Please see Figures 4-7 The lifting assembly is connected to one end of the pulling cable 11 away from the rotating lifting assembly. The lifting assembly is connected to the handle hole of the cable manhole cover and abuts against the ground outside the cable manhole cover. The lifting assembly includes: a lifting rod 12, a pulling frame 14 and a cross limiting structure.

[0029] The lifting rod 12 is rotatably connected to the pulling cable 11. A roller 13 is rotatably mounted on the end of the lifting rod 12 away from the pulling cable 11. After the cross-shaped limiting structure is connected to the handle hole of the cable manhole cover, when the end of the lifting rod 12 away from the roller 13 is pulled upward, the angle of the lifting rod 12 will change. At the same time, the roller 13 can roll on the ground, thereby preventing the end of the lifting rod 12 from sliding on the ground and causing wear.

[0030] The traction frame 14 is rotatably mounted on the lifting rod 12, and the rotatable connection between the traction frame 14 and the lifting rod 12 is located at the end of the lifting rod 12 away from the traction cable 11.

[0031] When lifting the cable manhole cover, the cross-shaped limiting structure will first be inserted into the handle hole in the cable manhole cover and locked. Then, the roller 13 will be placed on the ground outside the cable manhole cover. Since the rotating connection of the lifting rod 12 is located at the end of the lifting rod 12 away from the pulling cable 11, when the pulling cable 11 drives one end of the lifting rod 12 to move upward, the cross-shaped limiting structure can generate a greater upward force under the action of the lever principle, thereby making it easier to separate the cable manhole cover.

[0032] Furthermore, based on the lever principle mentioned above, the force provided by the hydraulic cylinder 3 can also be smaller, thereby further reducing the impact acceleration at the moment of separation between the manhole cover and the structural component, and improving the stability during the separation process.

[0033] Please see Figures 5-7 The cross-shaped limiting structure is disposed on the pulling frame 14. The cross-shaped limiting structure can extend into and lock the handle hole of the cable manhole cover. The cross-shaped limiting structure includes a switching sleeve 17 rotatably mounted on the pulling frame 14. The lower end of the switching sleeve 17 is provided with a protrusion 1701. The lower end of the pulling frame 14 is also provided with two sets of stop portions 1401. The line connecting the two sets of stop portions 1401 is perpendicular or parallel to the length direction of the protrusion 1701. In the moving state, the stop part 1401 can overlap with the two sets of stop parts 1401, making it easier to insert into the handle hole of the cable manhole cover. When the two are inserted into the handle hole, the stop part 1401 is used to lock the two ends of the handle hole, and the protrusion 1701 rotates 90° to make the two form a perpendicular relationship. At this time, the handle hole of the cable manhole cover is locked, thereby ensuring the connection stability between the pull frame 14 and the handle hole of the cable manhole cover, and improving the stability and safety when moving the cable manhole cover in the future.

[0034] The cross-shaped limiting structure also includes an elastic abutment kit for limiting the rotation degree of the switching sleeve 17. The elastic abutment kit includes a spring telescopic rod 15 fixedly installed on the traction frame 14. The moving end of the spring telescopic rod 15 is connected to a horizontal plate 16. A lifting shaft 18 penetrating the switching sleeve 17 is connected to the horizontal plate 16. A convex shaft 1801 is provided on the lifting shaft 18. The elastic abutment kit also includes four sets of spiral extensions 1702 provided on the inner wall of the switching sleeve 17. A recess 1703 or a protrusion 1704 is formed at the connection of two adjacent sets of spiral extensions 1702. The central angle between two adjacent sets of recesses 1703 is 90°.

[0035] When the line connecting the two sets of stop portions 1401 is parallel to the length direction of the protrusion 1701, the convex shaft 1801 is located in one of the sets of recesses 1703. At this time, the elastic force provided by the spring telescopic rod 15 tends to make the convex shaft 1801 abut against the recess 1703, that is, the relative position between the stop portion 1401 and the protrusion 1701 will not change, thereby making it more convenient to operate when they are inserted into the handle hole.

[0036] When the stop part 1401 and the protrusion 1701 are inserted into the handle hole, the switching sleeve 17 is rotated. At this time, the switching sleeve 17 will rotate relative to the lifting shaft 18. During this process, the convex shaft 1801 moves towards the protrusion 1704 through one set of spiral extensions 1702, so that the spring telescopic rod 15 stores elastic potential energy. After the convex shaft 1801 moves past the protrusion 1704, the convex shaft 1801 will move along the other set of spiral extensions 1702. At the same time, the spring telescopic rod 15 releases elastic potential energy and drives the convex shaft 1801 towards the other set of recesses 1703, so that the switching sleeve 17 can rotate 90°. At this time, the line connecting the two sets of stop parts 1401 and the length direction of the protrusion 1701 changes from a parallel state to a perpendicular state, thereby realizing a stable connection between the cable manhole cover and the pull frame 14 and ensuring the stability during the movement of the cable manhole cover.

[0037] As an embodiment of the present invention, a method for correcting a cable manhole cover using the aforementioned automatic correction-based cable manhole cover auxiliary removal device is also proposed, comprising the following steps: Step 1: Control the lifting device 1 to position the auxiliary lifting mechanism directly above the cable manhole cover to be removed, and then lower the auxiliary lifting mechanism to the predetermined height; Step 2: Insert the lifting assembly into the handle hole of the cable manhole cover and make the lifting assembly abut against the ground outside the cable manhole cover; Step 3: Control the rotation and lifting assembly to tighten the traction cable 11. During the tightening process of the traction cable 11, the rotation and lifting assembly rotates actively so that the plane where the traction cable 11 is located passes through the central axis of the cable manhole cover to be removed. Step 4: The engaging structure engages to lock the rotating lifting component; Step 5: The rotating lifting assembly reverses its movement to push out the cable manhole cover to be removed.

[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A cable manhole cover auxiliary removal device based on automatic correction, comprising: A lifting device, wherein an auxiliary lifting mechanism is connected to the lifting device; characterized in that the auxiliary lifting mechanism comprises: a connecting frame disposed on the lifting device, wherein a rotary lifting assembly is connected to the connecting frame, and the rotary lifting assembly has a built-in locking disc; a pull cable, wherein multiple sets are disposed and equidistantly connected to the rotary lifting assembly, and the pull cable can rotate and rise relative to the connecting frame under the action of the rotary lifting assembly; and a clamping structure disposed on the rotary lifting assembly and adapted to the locking disc, wherein the clamping structure can lock the locking disc when the cable manhole cover is lifted.

2. The cable manhole cover auxiliary removal device based on automatic correction according to claim 1, characterized in that, The rotary lifting assembly includes multiple sets of hydraulic cylinders fixedly installed on the connecting frame. The actuating end of each hydraulic cylinder is connected to a drive frame, and the clamping structure is disposed on the drive frame.

3. The cable manhole cover auxiliary removal device based on automatic correction according to claim 2, characterized in that, The rotary lifting assembly also includes a rotary table concentric and parallel to the drive frame. The rotary table is provided with multiple sets of grooved wheels, which roll in cooperation with annular protrusions on the drive frame. The locking disc is coaxially and fixedly connected to the rotary table.

4. The cable manhole cover auxiliary removal device based on automatic correction according to claim 2, characterized in that, The clamping structure includes multiple sets of electric telescopic rods that are circumferentially and equidistantly mounted on the drive frame. An arc-shaped component is connected to the actuating end of each electric telescopic rod. A resistance-increasing plate is provided on the side of the arc-shaped component away from the electric telescopic rod, and the resistance-increasing plate is adapted to the locking disc.

5. The cable manhole cover auxiliary removal device based on automatic correction according to claim 1, characterized in that, It also includes a lifting assembly, which connects to one end of the pull cable away from the rotating lifting assembly. The lifting assembly is connected to the handle hole of the cable manhole cover and abuts against the ground outside the cable manhole cover.

6. The cable manhole cover auxiliary removal device based on automatic correction according to claim 5, characterized in that, The lifting assembly includes: a lifting rod rotatably connected to the pulling cable, with a roller rotatably mounted on the end of the lifting rod away from the pulling cable; a pulling frame rotatably mounted on the lifting rod; and a cross-shaped limiting structure disposed on the pulling frame, the cross-shaped limiting structure being able to extend into the handle hole of the cable manhole cover and lock.

7. The cable manhole cover auxiliary removal device based on automatic correction according to claim 6, characterized in that, The rotatable connection between the traction frame and the lifting rod is located at the end of the lifting rod away from the traction cable.

8. The cable manhole cover auxiliary removal device based on automatic correction according to claim 6, characterized in that, The cross-shaped limiting structure includes a switching sleeve rotatably mounted on the traction frame, with a protrusion at the lower end of the switching sleeve; the lower end of the traction frame is also provided with two sets of stops, the line connecting the two sets of stops being perpendicular or parallel to the length direction of the protrusion; the cross-shaped limiting structure also includes an elastic abutment kit for limiting the rotation degree of the switching sleeve.

9. A cable manhole cover auxiliary removal device based on automatic correction according to claim 8, characterized in that, The elastic abutment kit includes a spring telescopic rod fixedly installed on the traction frame. The moving end of the spring telescopic rod is connected to a horizontal plate. A lifting shaft that passes through the switching sleeve is connected to the horizontal plate. A convex shaft is provided on the lifting shaft. The elastic abutment kit also includes four sets of spiral extensions provided on the inner wall of the switching sleeve. The connection between two adjacent sets of spiral extensions forms a recess or a protrusion.

10. A method for correcting a cable manhole cover using the automatic correction-based cable manhole cover auxiliary removal device as described in any one of claims 5-9, characterized in that, Includes the following steps: Step 1: Control the lifting device to position the auxiliary lifting mechanism directly above the cable manhole cover to be removed, and then lower the auxiliary lifting mechanism to the predetermined height; Step 2: Insert the lifting assembly into the handle hole of the cable manhole cover and make the lifting assembly abut against the ground outside the cable manhole cover; Step 3: Control the movement of the rotating lifting component to tighten the traction cable. During the tightening process, the rotating lifting component rotates actively so that the plane where the traction cable is located passes through the central axis of the cable manhole cover to be removed. Step 4: The engaging structure engages to lock the rotating lifting component; Step 5: The rotating lifting assembly reverses its movement to push out the cable manhole cover to be removed.

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