Pipe lifting device

Abstract

The invention discloses a pipe lifting device which integrates two functions of storage and lifting and comprises a storage mechanism, a distribution mechanism, a lifting mechanism, a bearing foundation, power driving devices, a hydraulic control unit and an electric control system, and the lifting mechanism is driven to move up and down through the power driving devices arranged on the two sides and is matched with a platform crane to lift a drill rod. And the distribution mechanism moves to realize mutual transfer of the pipes from the drill rod storage yard to the storage mechanism, from the low position to the high position and from the ground to the power catwalk main workshop. According to the pipe lifting device, a joint crane can be omitted, the space limitation of a platform is reduced, and in addition, the pipe lifting device has the advantages of being high in working efficiency, safe and reliable in operation and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil drilling equipment, in particular to a tubular lifting device. BACKGROUND

[0002] In the process of oil drilling operation, tubular string conveying, make-up, discharge and tripping are one of the work with considerable proportion. In recent years, the tubular string automation system of land oil drilling rig is more and more mature, which has gradually replaced the traditional manual operation mode, can significantly improve the drilling efficiency, reduce the labor intensity, reduce the risk of manual operation, and improve the safety and reliability of the overall operation.

[0003] However, in the marine oil drilling operation, the tubular string automation system is relatively less applied, the main reason is that the marine operation environment is more severe, and the safety and reliability of the operation are higher.

[0004] Generally, the tubular string automation system needs to realize the automatic conveying, make-up, discharge and tripping of the tubular string.

[0005] In the automatic conveying link of the tubular string, joint crane is usually used to realize the mutual transfer of the tubular from the ground pipe discharge area to the main car of the power catwalk. In the application of joint crane, there are problems of frequent hoisting, small single hoisting amount, long continuous working time, limited efficiency, occupation of site and the like.

[0006] However, due to the condition limitation, the marine oil drilling platform is usually relatively small in area and the equipment layout is compact. On some old platforms or small platforms, it may even be difficult to meet the space requirement of the complete tubular string automation system.

[0007] Therefore, how to find a suitable way or product matching to replace the hoisting function of the joint crane, reduce the requirement for platform space, improve the working efficiency, reduce the hoisting machine working occupation time, and improve the safety and reliability of the operation will be an important direction for the improvement and improvement of the automatic conveying link of the tubular string. SUMMARY

[0008] The present application aims to provide a tubular lifting device to solve one or more of the problems in the background art.

[0009] To achieve the above-mentioned purpose, the present application discloses a tubular lifting device, which comprises a storage lifting assembly, a bearing base and a power driving system, the storage lifting assembly and the power driving system are arranged on the bearing base, at least two storage lifting assemblies are arranged on one side of the bearing base, each storage lifting assembly comprises a storage mechanism, a distribution mechanism and a lifting mechanism arranged correspondingly, wherein The storage mechanism is used for placing the storage pipe, and the storage mechanism has a rotating function. The rotation of the storage mechanism realizes the rolling of the pipe on the storage mechanism, so that the pipe is close to or away from the distribution mechanism. The distribution mechanism has a rotating function. The rotating function distributes and / or blocks the pipe on the storage mechanism and / or the lifting mechanism. The lifting mechanism has rotating and lifting functions. The rotating function receives the pipe distributed from the storage mechanism by the distribution mechanism and / or lowers the pipe to the storage mechanism. The rotating function receives the pipe moved from the pipe horizontal moving device at a high position and / or transfers the pipe to the wellhead pipe moving device at a high position. The lifting function drives the pipe to be lifted or lowered. The power driving system is used to drive the lifting mechanism to realize the lifting function.

[0010] In some embodiments, the storage mechanism includes a storage arm, a first material blocking pin, and a first telescopic piece. The storage arm is used for placing the storage pipe. One side end of the storage arm is connected with the bearing base, and the other side end of the storage arm is connected with the first material blocking pin. One side end of the first telescopic piece is connected with the storage arm, and the other side end of the first telescopic piece is connected with the bearing base. The rotation of the storage arm is realized by the extension and retraction of the first telescopic piece.

[0011] In some embodiments, the distribution mechanism includes a second telescopic piece, a distribution rod, and a blocking pin. One side end of the distribution rod is connected with the storage arm, and the other side end of the distribution rod is connected with the blocking pin. One end of the second telescopic piece is connected with the storage arm, and the other side end of the second telescopic piece is connected with the distribution rod. The rotation of the distribution rod is realized by the extension and retraction of the second telescopic piece.

[0012] In some embodiments, a plurality of blocking pin mounting holes are arranged on the distribution rod corresponding to the blocking pin. The blocking pin is connected with one of the blocking pin mounting holes in a detachable manner.

[0013] In some embodiments, the lifting mechanism includes a lifting arm, a second material blocking pin, a lifting trolley, and a third telescopic piece. The lifting arm is arranged on the lifting trolley. One end of the third telescopic piece is connected with the lifting trolley, and the other end of the third telescopic piece is connected with the lifting arm. The rotation of the lifting arm is realized by the extension and retraction of the third telescopic piece. Both side ends of the lifting arm are provided with the second material blocking pin. The lifting trolley is connected with the power driving system.

[0014] In some embodiments, The height of the second material blocking pin is adjustable. The lifting trolley is connected with the power driving system through a chain transfer device. A roller is arranged on the lifting trolley corresponding to the bearing base.

[0015] In some embodiments, The storage mechanism and the lifting mechanism are connected with different sides of the storage mechanism, respectively; The storage mechanism comprises base columns arranged on the left and right sides, a cross beam and a pull frame arranged between the two base columns, a lower limit and an upper limit, and the upper and lower side ends of the base columns are respectively provided with the upper limit and the lower limit corresponding to the lifting mechanism.

[0016] In some embodiments, the base column comprises a base section and a middle section, one or more middle sections are arranged above the base section, and adjacent base sections and middle sections are connected in a detachable manner. The two side ends of the cross beam are respectively connected with the base sections of the two base columns, and the two side ends of the pull frame are respectively connected with the middle sections of the two base columns in a detachable manner.

[0017] In some embodiments, the power driving system comprises a motor driving device, a driving sprocket, a chain, a push rod, a tensioning sprocket and a driven sprocket, the motor driving device and the driving sprocket are arranged on the upper part of the bearing base, the output shaft of the motor driving device is connected with the driving sprocket, the chain is connected with the driving sprocket, the tensioning sprocket and the driven sprocket, the tensioning sprocket and the driven sprocket are arranged on the lower part of the bearing base, the tensioning sprocket is connected with the bearing base through a connecting arm, the length of the push rod is adjusted to rotate the connecting arm and the tensioning sprocket, the chain is tensioned, and the lifting mechanism is connected with the chain.

[0018] In some embodiments, the first telescopic part, the second telescopic part and the third telescopic part are all oil cylinders; the pipe lifting device further comprises a drag chain, a hydraulic control unit and an electric control system, the hydraulic control unit is connected with the oil cylinders to control the working conditions of the oil cylinders, the electric control system is linked with the hydraulic control unit, the electric control system is connected with the motor driving device to control the working state of the motor driving device.

[0019] Compared with the prior art, the pipe lifting device can use the existing crane of the drilling platform to replace the joint crane, and can hoist multiple pipes from the pipe arrangement area on the ground to the low-position storage area of the pipe lifting device; through the pipe lifting device, the pipes can be transferred from the low position to the high position and from the ground to the main vehicle room of the power catwalk, and then transferred to the automatic conveying link of the pipe station; through the structural design of the pipe lifting device, the configuration of the joint crane can be omitted, and the space limitation of the platform can be reduced; secondly, the pipe lifting device has a storage function, which can reduce the working occupation time of the platform crane; in addition, multiple pipes can be transferred at the same time during pipe transfer, which can effectively improve the work efficiency; moreover, the mutual transfer of the pipes from the low position to the high position and from the ground to the main vehicle room of the power catwalk can be remotely operated by the operator, which can reduce the operation risk and significantly improve the safety and reliability of the operation. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Structure diagram of the pipe lifting device in some embodiments of the present application; Figure 2 Structure diagram of the storage mechanism and the distribution mechanism in some embodiments of the present application; Figure 3 Structure diagram of the pipe lifting device in some embodiments of the present application; Figure 2 Enlarged view of A-a part in FIG. 5; Figure 4 Storage state diagram of the storage mechanism in some embodiments of the present application; Figure 5 Inversion and positioning state diagram of the storage mechanism in some embodiments of the present application; Figure 6 Distribution state diagram of the storage mechanism in some embodiments of the present application; Figure 7 Structure diagram of the lifting mechanism in some embodiments of the present application; Figure 8 State 1 diagram of the lifting mechanism in some embodiments of the present application; Figure 9 State 2 diagram of the lifting mechanism in some embodiments of the present application; Figure 10 Structure diagram of the bearing base in some embodiments of the present application; Figure 11 Structure diagram of the pipe lifting device in some embodiments of the present application; Figure 10 Enlarged view of B-a part in FIG. 7; Figure 12 Structure diagram of the pipe lifting device in some embodiments of the present application; Figure 10 Enlarged view of B-b part in FIG. 7; Figure 13 Structure diagram of the power driving system in some embodiments of the present application; Figure 14 Structure diagram of the pipe lifting device in some embodiments of the present application; Figure 13 Enlarged view of C-a part in FIG. 9; Figure 15 Structure diagram of the pipe lifting device in some embodiments of the present application; Figure 13 Enlarged view of C-b part in FIG. 9. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. Figures 1 to 15The content shown in this embodiment is a preferred implementation method, which discloses a pipe lifting device. The pipe lifting device has the functions of storing pipes (such as drill pipes, drill collars, etc.) and lifting pipes. The pipe lifting device includes a storage and lifting assembly, a supporting base 4, a power drive system 5, and an electronic control system 8. The supporting base 4 is respectively provided with a storage and lifting assembly on the left and right sides. Each storage and lifting assembly includes a storage mechanism 1, a distribution mechanism 2, and a lifting mechanism 3 arranged in a corresponding manner. The storage mechanism 1, the distribution mechanism 2, the lifting mechanism 3, the power drive system 5, and the electronic control system 8 are assembled on the supporting base 4. The rotation of the storage mechanism 1 can achieve the back and forth rolling of the pipe 9 on the storage mechanism 1, so that the pipe is moved closer to or away from the distribution mechanism 2; the reverse rotation of the distribution mechanism 2 (e.g., Figures 2 to 6 The counterclockwise rotation (as shown) action distributes the lifted pipes to the lifting mechanism 3, and blocks the remaining pipes 9 at the tail of the distribution mechanism 2, thereby separating the pipes 9; through the forward rotation action of the distribution mechanism 2, the pipes 9 lowered to the storage mechanism 1 are distributed to the side away from the supporting foundation 4; through the up and down movement of the lifting mechanism 3, the pipes 9 are transferred between the storage mechanism 1 and the catwalk body.

[0023] Combine Figures 2 to 6 As shown, the storage mechanism 1 includes a first hinge 101, a storage arm 102, a first stop pin 103, a second hinge 104, a storage cylinder 105, and a third hinge 106. One or more pipes 9 are placed and stored on the storage arm 102. The storage arm 102 is connected to the supporting base 4 through the first hinge 101. The other end of the storage arm 102 is connected to the first stop pin 103. One end of the storage cylinder 105 is connected to the supporting base 4 through the third hinge 106. The other end of the storage cylinder 105 is connected to the storage arm 102 through the second hinge 104. The rotation of the storage arm 102 around the first hinge 101 is achieved by the extension and retraction of the storage cylinder 105, so that the pipes stored on the storage arm 102 roll back and forth on the storage arm 102, approaching or moving away from the distribution mechanism 2.

[0024] Combine Figures 2 to 6 As shown, the dispatch mechanism 2 includes a fourth hinge shaft 201, a dispatch cylinder 202, a fifth hinge shaft 203, a sixth hinge shaft 204, a dispatch lever 205, and a stop pin 206. The dispatch lever 205 is connected to the storage arm 102 via the fourth hinge shaft 201, allowing the dispatch lever 205 to rotate around the fourth hinge shaft 201. One end of the dispatch cylinder 202 is connected to the storage arm 102 via the fifth hinge shaft 203, and the other end of the dispatch cylinder 202 is connected to the dispatch lever 205 via the sixth hinge shaft 204. When the dispatch cylinder 202 is extended, the dispatch lever 205 rotates in the forward direction (e.g., Figures 2 to 6The clockwise rotation) so that the pipe 9 on the distribution rod 205 is distributed to the tail of the storage arm 102; when the distribution cylinder 202 is shortened, the distribution rod 205 rotates in the opposite direction, so that the pipe on the distribution rod 205 is distributed to the lifting mechanism 3, and the remaining pipe 9 is blocked at the tail of the distribution rod 205, realizing the separation of the pipes. The distribution rod 205 described in the above has two or more blocking pin mounting holes, one of which is provided with a blocking pin 206 connected by a bolt or the like. The specific installation position of the blocking pin 206 can be adjusted as needed to adjust the length of the pipe interval on the distribution rod 205, so as to realize the distribution function of different pipe sizes, multiple pipes or single large-diameter pipes. For example: Figure 2 and Figure 3 As shown, the distribution rod 205 is provided with a first blocking pin mounting hole 207 and a second blocking pin mounting hole 208, and the blocking pin 206 is installed on the first blocking pin mounting hole 207 and the second blocking pin mounting hole 208 according to the needs.

[0025] The lifting mechanism 3 in the low position (i.e. when the bottom surface of the lifting mechanism is close to or in contact with the lower limit position 407) receives the pipe distributed from the storage mechanism by the distribution mechanism and / or lowers the pipe to the storage mechanism through the rotation function; the lifting mechanism 3 in the high position (i.e. when the bottom surface of the lifting mechanism is close to or in contact with the upper limit position 408) receives the pipe moved from the pipe horizontal moving device and / or high-position pipe to the wellhead pipe moving device through the rotation function in the high position Figures 6 to 9As shown, the lifting mechanism 3 includes a lifting arm 301, a seventh hinge shaft 302, a second material blocking pin 303, a chain adapter 304, a lifting trolley 305, a roller 307, an eighth hinge shaft 308, a lifting cylinder 309, a ninth hinge shaft 310, the lifting arm 301 is connected with the lifting trolley 305 through the seventh hinge shaft 302, one end of the lifting cylinder 309 is connected with the lifting trolley 305 through the eighth hinge shaft 308, the other end of the lifting cylinder 309 is connected with the lifting arm 301 through the ninth hinge shaft 310, the extension and retraction of the lifting cylinder 309 makes the lifting arm 301 rotate around the seventh hinge shaft 302, so as to realize the rolling of the pipe tool 9 on the lifting arm 301; the two side ends of the lifting arm 301 are both provided with the second material blocking pin 303, a plurality of clamping grooves can be arranged on the second material blocking pin 303, so as to adjust the height of the material blocking pin above the lifting arm 301 through the existing clamping mode, so as to meet the pipe tool moving requirements; the chain adapter 304 is connected with the power driving system 5, the chain adapter 304 is connected with the lifting trolley 305 through one or more of the existing connecting members such as a pin shaft and a bolt, so that the lifting trolley 305 can move up and down under the driving of the power driving system 5, so as to realize the lifting and lowering of the pipe tool by the lifting mechanism 3. The lifting trolley 305 can be assembled with a plurality of rollers 307 on the side and / or bottom surface, the arrangement of the side rollers of the lifting trolley 305 can facilitate the lifting trolley 305 to move up and down along the guide rail arranged on the bearing base 4, so as to ensure the stable operation of the lifting mechanism 3. The lifting mechanism 3 can also be assembled with a lubricating device 306. The lifting cylinder 309 of the lifting mechanism described herein can also be replaced by a manually adjustable length extension member such as a lead screw / connecting rod, so as to meet the lifting and lowering of the pipe tool by extending / shortening the lead screw / connecting rod.

[0026] In combination Figures 10 to 12 As shown, the bearing base 4 includes a right base column, a cross beam 403, a pull frame 404, a left base, a lower limit 407 and an upper limit 408, the right base column includes a right base section 401 and a right middle section 402 arranged from bottom to top, the left base column includes a left base section 406 and a left middle section 405 arranged from bottom to top, the cross beam 403 and the pull frame 404 are arranged between the right base column and the left base, the cross beam 403 is arranged above the pull frame 404, by increasing or decreasing the number or height of the right middle section 402 and the left middle section 405, the height of the bearing base 4 can be adjusted to meet the requirements of different height drilling platforms, so that a set of pipe tool lifting device can be applied to multiple drilling platforms; the right base column and the left base are both provided with the lower limit 407 and the upper limit 408, which limits the running range of the lifting mechanism 3, so as to ensure the running height of the lifting mechanism and avoid the collision between the lifting mechanism 3 and the ground and the jamming of the chain adapter 304 and the driving sprocket.

[0027] In combination Figures 13 to 15As shown in the content, the power driving system 5 includes a motor driving device 501, a driving sprocket 502, a chain 503, a push rod 504, a tension sprocket 505, a driven sprocket 506, the motor driving device 501 and the driving sprocket 502 are arranged on the upper part of the load-bearing base 4, the output shaft of the motor driving device 501 is connected with the driving sprocket 502, the chain 503 is connected with the driving sprocket 502, the tension sprocket 505 and the driven sprocket 506, the tension sprocket 505 and the driven sprocket 506 are arranged on the lower part of the load-bearing base, the position of the driven sprocket 506 is adjustable left and right to realize the centering with the driving sprocket 502; the tension sprocket 505 is connected with the load-bearing base 4 through a connecting arm and a hinge shaft, the length of the push rod 504 is adjusted to make the connecting arm and the tension sprocket 505 rotate around the hinge shaft, so as to tension the chain 503, wherein the length adjustment of the push rod 504 can be realized manually, or can be realized by power driving through the existing technology. An encoder can be additionally arranged on the motor driving device 501, and upper and lower proximity switches are arranged to cooperate with the upper and lower mechanical limit positions (the lower limit position 407 and the upper limit position 408) on the load-bearing base 4, so as to form multiple safety protection measures and ensure the safe operation of the mechanism.

[0028] The pipe lifting device can realize the transfer of one or more pipes from a low position to a high position, the lifting of multiple pipes by the crane at one time and the storage of the pipes on the storage mechanism 1, the continuous lifting of the pipes by the lifting mechanism 3 multiple times, the continuous lowering of the pipes by the lifting mechanism 3 multiple times, the lifting of multiple pipes by the crane at one time and the storage of the pipes on the pipe storage yard, the adjustment of the height of the pipe lifting device to meet the height requirements of different drilling platforms, and the adjustment of the length of the distribution rod 205 of the pipe lifting device to meet the transportation requirements of pipes (drill collars) of different sizes.

[0029] Through the above measures, the lifting function of the joint crane can be replaced, the space requirement of the platform can be reduced, the work efficiency can be improved, the working time of the crane can be reduced, and the safety and reliability of the operation can be improved.

[0030] The pipe lifting device further includes a drag chain 6 and a hydraulic control unit 7, the two components can be directly arranged on the load-bearing base 4, the hydraulic control unit 7 can be connected with all the oil cylinders to control the working conditions of the oil cylinders, and the drag chain 6 can be used to comb, guide and protect the pipelines for conveying hydraulic oil and the related wires led out by the electric control system.

[0031] The above undisclosed matters can be realized by using the existing technology, and therefore will not be described here.

[0032] Finally, it should be noted that in the description of the present application, it should be noted that the terms "vertical", "upper", "lower", "horizontal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0033] In the description of the present application, the telescopic member can be in the form of a hydraulic cylinder, a pneumatic cylinder, a manually adjustable screw rod / link, etc., and it cannot be determined that the specific implementation of the present application is limited to the form of a hydraulic cylinder.

[0034] In the description of the present application, it should also be noted that unless otherwise explicitly specified and limited, the terms "provided", "mounted", "connected", "linked" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements, and for those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] The above is a further detailed description of the present application in combination with the specific embodiments, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For those skilled in the art, without departing from the concept of the present application, a number of simple deductions or substitutions can also be made, which should be regarded as falling within the protection scope determined by the claims submitted by the present application.

Claims

1. A pipe lifting device, characterized in that: It includes a storage and lifting assembly, a bearing base, and a power drive system. The storage and lifting assembly and the power drive system are arranged on the bearing base. At least two storage and lifting assemblies are arranged on one side of the bearing base. Each of the storage and lifting assemblies includes a storage mechanism, a distribution mechanism, and a lifting mechanism that are arranged correspondingly to each other. The storage mechanism is used to store pipes. The storage mechanism has a rotation function. The rotation of the storage mechanism enables the pipes to roll back and forth on the storage mechanism, so that the pipes are moved closer to or away from the distribution mechanism. The distribution mechanism has a rotation function, which distributes and / or blocks the pipes on the storage mechanism and / or the lifting mechanism through the rotation function; The lifting mechanism has the functions of rotation and lifting. The rotation function receives the pipes distributed from the storage mechanism by the distribution mechanism and / or lowers the pipes to the storage mechanism; the rotation function receives the pipes transferred from the horizontal pipe transfer device at a high position and / or transfers the pipes at a high position to the wellhead pipe transfer device; the lifting function drives the pipes to be lifted up or lowered; The power drive system is used to drive the lifting mechanism to achieve the lifting function.

2. The pipe lifting device according to claim 1, characterized in that: The storage mechanism includes a storage arm, a first stop pin, and a first telescopic part. The storage arm is used to place storage pipes. One side end of the storage arm is connected to the supporting base, and the other side end of the storage arm is connected to the first stop pin. One side end of the first telescopic part is connected to the storage arm, and the other side end of the first telescopic part is connected to the supporting base. The rotation of the storage arm is achieved by the telescopic movement of the first telescopic part.

3. The pipe lifting device according to claim 2, characterized in that: The allocation mechanism includes a second telescopic member, a allocation rod and a stop pin. One end of the allocation rod is connected to the storage arm, and the other end of the allocation rod is connected to the stop pin. One end of the second telescopic member is connected to the storage arm, and the other end of the second telescopic member is connected to the allocation rod. The rotation of the allocation rod is achieved by the extension and retraction of the second telescopic member.

4. The pipe lifting device according to claim 3, characterized in that: The derailleur rod is provided with a plurality of stop pin mounting holes corresponding to the stop pin, and the stop pin is connected to one of the stop pin mounting holes in a detachable connection manner.

5. The pipe lifting device according to claim 3, characterized in that: The lifting mechanism includes a lifting arm, a second material stop pin, a lifting pulley, and a third telescopic member. The lifting arm is arranged on the lifting pulley, one end of the third telescopic member is connected to the lifting pulley, and the other end of the third telescopic member is connected to the lifting arm. The rotation of the lifting arm is achieved by the extension and contraction of the third telescopic member. Second material stop pins are provided on both side ends of the lifting arm, and the lifting pulley is connected to the power drive system.

6. The pipe lifting device according to claim 5, characterized in that: The height of the second material stop pin is adjustable; The lifting pulley is connected to the power drive system via a chain adapter; Rollers are provided on the lifting pulley corresponding to the bearing foundation.

7. The pipe lifting device according to claim 5, characterized in that: The storage mechanism and the lifting mechanism are respectively connected to different sides of the storage mechanism; The storage mechanism includes base columns arranged on the left and right sides, a beam and a pull frame arranged between the two base columns, a lower limit and an upper limit, and the upper and lower ends of the base columns are respectively provided with an upper limit and a lower limit corresponding to the lifting mechanism.

8. The pipe lifting device according to claim 7, characterized in that: The base column comprises a base section and a middle section, one or more middle sections are arranged above the base section, and adjacent base sections and middle sections, as well as adjacent middle sections, are connected in a detachable manner; The two side ends of the crossbeam are respectively connected to the base sections of the two base columns, and the two side ends of the pull frame are respectively connected to the middle sections of the two base columns in a detachable manner.

9. The pipe lifting device according to claim 7, characterized in that: The power drive system includes a motor drive device, a driving sprocket, a chain, a push rod, a tensioner, and a driven sprocket. The motor drive device and the driving sprocket are arranged on the upper part of the load-bearing base, the output shaft of the motor drive device is connected to the driving sprocket, the chain is connected to the driving sprocket, the tensioner, and the driven sprocket, and the tensioner and the driven sprocket are arranged at the lower part of the load-bearing base; the tensioner is connected to the load-bearing base through a connecting arm, and by adjusting the length of the push rod, the connecting arm and the tensioner are rotated, the chain is tensioned, and the lifting mechanism is connected to the chain.

10. The pipe lifting device according to claim 9, characterized in that: The first telescopic part, the second telescopic part and the third telescopic part are all cylinders; the pipe lifting device also includes a drag chain, a hydraulic control unit and an electronic control system. The hydraulic control unit is connected to the cylinder to control the working conditions of each cylinder. The electronic control system is linked to the hydraulic control unit, and the electronic control system is connected to the motor drive device to control the working state of the motor drive device.

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