Lifting tool

Abstract

The invention discloses a lifting tool which comprises a tool body, a locking ring and a driving assembly. The tool body is provided with a lifting end and a working end which are oppositely arranged, and the lifting end of the tool body is used for being connected with a hoisting tool; the radial outer side of the working end of the tool body is sleeved with the locking ring, the locking ring is connected with the limiting piece in an abutting mode, the limiting piece is detachably connected with the tool body, and the limiting piece limits the locking ring to move in the axial direction of the tool body; the driving assembly comprises a driving sleeve, the driving sleeve is slidably arranged between the tool body and the locking ring, the distance between the outer side wall of the driving section of the driving sleeve and the axis of the tool body is gradually increased from the working end to the lifting end, and based on sliding of the driving sleeve, the driving sleeve applies acting force in the radial direction of the tool body to the locking ring. The acting force applied by the driving sleeve to the locking ring in the radial direction of the tool body is transmitted to the to-be-lifted piece, so that the friction force between the locking ring and the to-be-lifted piece is increased, and it is guaranteed that the to-be-lifted piece is stably installed on the outer side of the tool body.

Description

Technical Field

[0001] The present invention belongs to the technical field of lifting of tubing hangers, and particularly relates to a lifting tool. Background Art

[0002] The lifting tool for tubing hanger is an important lifting tool for the tubing hanger of underwater production equipment, mainly used for the lifting work of the tubing hanger. Under normal installation conditions, it is necessary to lift and install the tubing hanger. The lifting tool for tubing hanger needs to face the situation of high load and strong torque, and may also face more severe working conditions, such as waves, ocean currents, and the drift of the drilling ship. The existing lifting tools are often a locking block that can move radially along the tool body. The locking block is driven by a hydraulic driving member to drive the locking block to move, so that the locking ring outside the locking block is clamped with the tubing hanger to complete the fixing work. However, the existing lifting tools often control the movement of the locking block through a hydraulic system, but the hydraulic control system is affected by the seabed pressure and ocean current, and the stability is poor; and the locking ring only has one radial limit of the locking block, and there is no direct connection between the two, so it is impossible to ensure that the locking ring can only move radially. Summary of the Invention

[0003] The purpose of the present invention is to provide a lifting tool to solve the problems existing in the above-mentioned prior art.

[0004] To achieve the above purpose, the present invention provides a lifting tool, including a tool body, a locking ring and a driving assembly; the tool body is provided with a lifting end and a working end arranged oppositely, and the lifting end of the tool body is used for connecting with a lifting tool; the locking ring is sleeved on the radial outside of the working end of the tool body, the locking ring is in contact connection with a limiting member, the limiting member is detachably connected with the tool body, and the limiting member restricts the locking ring from moving axially along the tool body.

[0005] The driving assembly includes a driving sleeve, the driving sleeve is slidably arranged between the tool body and the locking ring, the driving sleeve is provided with a driving section, and the distance between the outer side wall of the driving section and the axis of the tool body gradually increases from the working end to the lifting end. Based on the sliding of the driving sleeve, the driving sleeve applies a radial force to the locking ring along the tool body.

[0006] Optionally, the driving sleeve is detachably connected with a driving element, and based on the driving of the driving element, the driving sleeve moves axially along the tool body.

[0007] Optionally, the driving element is an excitation ring, the excitation ring is sleeved on the radial outside of the tool body, and the excitation ring is threadedly connected with the tool body.

[0008] Optionally, one end of the excitation ring close to the driving sleeve is detachably connected to a fixing ring, and an annular protrusion is provided on one side of the driving sleeve close to the excitation ring, and the annular protrusion is clamped between the excitation ring and the fixing ring.

[0009] Optionally, a wear-resistant ring is provided between the annular protrusion and the excitation ring, and between the annular protrusion and the fixing ring.

[0010] Optionally, a first threaded hole and a second threaded hole are provided on one side of the working end of the tool body, and a third threaded hole is provided on the excitation ring; when a first screw is connected between the first threaded hole and the third threaded hole, the distance between the inner wall of the locking ring and the axis of the tool body is a first distance; when a first screw is connected between the second threaded hole and the third threaded hole, the distance between the inner wall of the locking ring and the axis of the tool body is a second distance; the first distance is smaller than the second distance.

[0011] Optionally, a plurality of handles are detachably connected to the radial outer side of the excitation ring.

[0012] Optionally, the piece to be lifted is provided with an annular groove at a position opposite to the locking ring, and an annular protrusion is provided on the radial outer side of the locking ring, and the piece to be lifted is clamped with the locking ring.

[0013] Optionally, the limiting member is a fixed sleeve, which is sleeved on the radially outer side of the tool body and is threadedly connected to the tool body; the side of the fixed sleeve close to the driving sleeve is fixedly connected to the limiting sleeve, and a sliding channel for the driving sleeve to slide is provided between the limiting sleeve and the tool body, and the side of the limiting sleeve facing away from the fixed sleeve is in contact with the locking ring.

[0014] Optionally, a guide ring is detachably connected to the end of the tool body at the working end, and the outer diameter of the guide ring is smaller than the inner diameter of the part to be lifted.

[0015] Compared with the prior art, the present invention has the following advantages and technical effects: When the present invention works, the lifting end of the tool body is connected to a lifting tool, and the spatial transfer of the tool body and the piece to be lifted is realized through the lifting tool. When it is necessary to complete the installation of the tool body and the piece to be lifted, the piece to be lifted is sleeved on the radial outside of the working end of the tool body, and the driving sleeve is controlled to slide, and the sliding direction is from the lifting end to the working end. Moreover, since the distance between the outer side wall of the driving sleeve and the axis of the tool body gradually increases from the working end to the lifting end, during the sliding process of the driving sleeve, the driving sleeve exerts a force perpendicular to the contact surface on the locking ring. However, since the locking ring is in contact connection with the limiting member and the limiting member restricts the axial movement of the locking ring along the tool body, the force exerted by the driving sleeve on the locking ring drives the locking ring to move radially along the tool body, the inner diameter of the locking ring becomes larger, that is, the locking ring is expanded. The locking ring contacts the inner wall of the piece to be lifted, and the force exerted by the driving sleeve on the locking ring in the radial direction of the tool body is transmitted to the piece to be lifted, thereby increasing the friction between the locking ring and the piece to be lifted, ensuring that the piece to be lifted is stably installed outside the tool body; and the expanded locking ring will exert a force pointing to the axis of the tool body on the driving sleeve, increasing the friction between the driving sleeve and the tool body. After the driving sleeve stops sliding, it can be stably sleeved outside the tool body. While ensuring the position stability of the locking ring, it is ensured that the locking ring can continuously exert a force on the piece to be lifted, further ensuring that the piece to be lifted is stably installed outside the tool body.

[0016] When it is necessary to separate the tool body and the piece to be lifted, the driving sleeve is controlled to slide, and the sliding direction is from the working end to the lifting end. Moreover, since the distance between the outer side wall of the driving sleeve and the axis of the tool body gradually increases from the working end to the lifting end, during the sliding process of the driving sleeve, the force exerted by the driving sleeve on the locking ring gradually decreases. And since the limiting member restricts the axial movement of the locking ring along the tool body, the inner diameter of the locking ring becomes smaller, that is, the locking ring returns to its original state, the force exerted by the locking ring on the piece to be lifted disappears, and the constraint between the locking ring and the lifted piece disappears, completing the disassembly work of the tool body and the piece to be lifted.

[0017] In the present invention, a driving element is used to control the axial movement of a driving sleeve along a tool body, so as to realize the radial movement of a locking ring along the tool body, and further complete the installation or disassembly of the tool body and the component to be lifted. An excitation ring is arranged on the side of the driving sleeve away from the limiting member. Since the excitation ring is threadedly connected to the tool body, during operation, by rotating the excitation ring, the excitation ring moves along the axis direction of the tool body. And because the excitation ring is detachably connected to the driving sleeve, during the movement of the excitation ring, the driving sleeve will be driven to move along the axis direction of the tool body. Moreover, the threaded connection can ensure the stability of the connection between the excitation ring and the tool body, and further ensure the stability of the position of the locking ring. A fixed sleeve is sleeved on the outer side of the tool body in the radial direction, and the fixed sleeve is threadedly connected to the tool body, realizing the relative fixation of the fixed sleeve with respect to the tool body, that is, realizing the relative fixation of the limiting sleeve. When the driving sleeve slides from the lifting end to the working end, the limiting sleeve can continuously apply an axial force to the locking ring, offsetting the axial force applied by the driving sleeve to the locking ring, ensuring that the locking ring can only move in the radial direction of the tool body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only 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.

[0019] Figure 1 Structural schematic diagram of the lifting tool of the present invention; Figure 2 For Figure 1 Partial enlarged view of A in Figure 3 For Figure 1 Partial enlarged view of B in Figure 4 For Figure 1 Partial enlarged view of C in (the locking ring is in the excited state diagram); Figure 5 For Figure 1 Partial enlarged view of C in (the locking ring is in the unexcited state diagram); Figure 6 For Figure 1 Partial enlarged view of F in Figure 7 Structural schematic diagram of the connection between the lifting tool of the present invention and a tubing hanger; Figure 8 For Figure 7 Partial enlarged view of D in Figure 9 Structural schematic diagram of the connection between the lifting tool of the present invention and a hole protection device; Figure 10 for Figure 9 A partial enlarged view of middle E; Among them, 1. tool body, 2. locking ring, 3. driving sleeve, 4. excitation ring, 5. fixing ring, 6. wear-resistant ring, 7. first threaded hole, 8. second threaded hole, 9. third threaded hole, 10. handle, 11. fixing sleeve, 12. limiting sleeve, 13. guide ring, 14. lifting parts. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0021] With reference to the accompanying drawings, the present invention provides a lifting tool, comprising a tool body 1, a locking ring 2 and a driving assembly, wherein the tool body 1 is provided with a lifting end and a working end which are arranged relatively to each other, and the lifting end of the tool body 1 is used to connect with a lifting tool; the locking ring 2 is sleeved on the radially outer side of the working end of the tool body 1, and the locking ring 2 is abutted and connected with a limiting member, and the limiting member is detachably connected to the tool body 1, and the limiting member limits the axial movement of the locking ring 2 along the tool body 1; the driving assembly comprises a driving sleeve 3, and the driving sleeve 3 is slidably arranged between the tool body 1 and the locking ring 2, and the driving sleeve 3 is provided with a driving section, and the distance between the outer wall of the driving section and the axis of the tool body 1 gradually increases from the working end to the lifting end, and based on the sliding of the driving sleeve 3, the driving sleeve 3 applies a force on the locking ring 2 along the radial direction of the tool body 1. The driving sleeve 3 is detachably connected with a driving element. Based on the drive of the driving element, the driving sleeve 3 moves axially along the tool body 1. The driving element is an excitation ring 4, which is sleeved on the radially outer side of the tool body 1, and the excitation ring 4 and the tool body 1 are threadedly connected. The limiting member is a fixed sleeve 11, which is sleeved on the radially outer side of the tool body 1, and the fixed sleeve 11 is threadedly connected to the tool body 1. The fixed sleeve 11 is fixedly connected to the limiting sleeve 12 on the side close to the driving sleeve 3, and a sliding channel for the driving sleeve 3 to slide is provided between the limiting sleeve 12 and the tool body 1. The side of the limiting sleeve 12 facing away from the fixed sleeve 11 is in contact with the locking ring 2. In this embodiment, the lifting member 14 is a hole protection device and a tubing hanger.

[0022] During the operation of this embodiment, the lifting end of the tool body 1 is connected to a lifting tool, and the spatial transfer of the tool body 1 and the piece to be lifted 14 is realized through the lifting tool. When it is necessary to complete the installation of the tool body 1 and the piece to be lifted 14, the piece to be lifted 14 is sleeved on the radial outer side of the working end of the tool body 1. The driving sleeve 3 is controlled to slide, and the sliding direction is from the lifting end to the working end. Since the distance between the outer side wall of the driving sleeve 3 and the axis of the tool body 1 gradually increases from the working end to the lifting end, during the sliding process of the driving sleeve 3, the driving sleeve 3 exerts a force perpendicular to the contact surface on the locking ring 2. This force has an axial component force and a radial component force in the axial and radial directions of the tool body 1 respectively. However, since the locking ring 2 is in contact connection with the limiting member, the limiting member restricts the axial movement of the locking ring 2 along the tool body 1. Therefore, under the action of the axial component force, the locking ring 2 tightly abuts against the limiting member axially, and the radial component force drives the locking ring 2 to move radially along the tool body 1. The inner diameter of the locking ring 2 becomes larger, that is, the locking ring 2 is expanded. The locking ring 2 contacts the inner wall of the piece to be lifted 14, and the force exerted by the driving sleeve 3 on the locking ring 2 along the radial direction of the tool body 1 is transmitted to the piece to be lifted 14, thereby increasing the friction force between the locking ring 2 and the piece to be lifted 14 and ensuring that the piece to be lifted 14 is stably installed outside the tool body 1. Additionally, the expanded locking ring 2 exerts a force pointing towards the axis of the tool body 1 on the driving sleeve 3, increasing the friction force between the driving sleeve 3 and the tool body 1. After the driving sleeve 3 stops sliding, it can be stably sleeved outside the tool body 1, ensuring the position stability of the locking ring 2 while ensuring that the locking ring 2 can continuously exert a force on the piece to be lifted 14, further ensuring that the piece to be lifted 14 is stably installed outside the tool body 1.

[0023] When it is necessary to separate the tool body 1 and the piece to be lifted 14, the driving sleeve 3 is controlled to slide, and the sliding direction is from the working end to the lifting end. Since the distance between the outer side wall of the driving sleeve 3 and the axis of the tool body 1 gradually increases from the working end to the lifting end, during the sliding process of the driving sleeve 3, the force exerted by the driving sleeve 3 on the locking ring 2 gradually decreases. And because the limiting member restricts the axial movement of the locking ring 2 along the tool body 1, the inner diameter of the locking ring 2 becomes smaller, that is, the locking ring 2 returns to its original state. The force exerted by the locking ring 2 on the piece to be lifted 14 disappears, and the constraint between the locking ring 2 and the lifted piece disappears, completing the disassembly of the tool body 1 and the piece to be lifted 14.

[0024] In this embodiment, a driving element is used to control the axial movement of the driving sleeve 3 along the tool body 1, so as to realize the radial movement of the locking ring 2 along the tool body 1, and then complete the installation or disassembly of the tool body 1 and the lifting piece 14 to be lifted; the excitation ring 4 is arranged on the side of the driving sleeve 3 away from the limiting member. Since the excitation ring 4 is threadedly connected to the tool body 1, during operation, by rotating the excitation ring 4, the excitation ring 4 moves along the axis direction of the tool body 1. And because the excitation ring 4 is detachably connected to the driving sleeve 3, during the movement of the excitation ring 4, the driving sleeve 3 will be driven to move along the axis direction of the tool body 1, and the threaded connection can ensure the stability of the connection between the excitation ring 4 and the tool body 1; the fixed sleeve 11 is sleeved on the outer side of the tool body 1 in the radial direction, and the fixed sleeve 11 is threadedly connected to the tool body 1, realizing the relative fixation of the fixed sleeve 11 with respect to the tool body 1, that is, realizing the relative fixation of the limiting sleeve 12, ensuring that during the sliding of the driving sleeve 3 from the lifting end to the working end, the limiting sleeve 12 can continuously apply an axial force to the locking ring 2, offsetting the axial force applied by the driving sleeve 3 to the locking ring 2, and ensuring that the locking ring 2 can only move in the radial direction of the tool body 1.

[0025] In some embodiments, the lead angle of the control thread is less than or equal to the equivalent friction angle, and the frictional force between the thread pairs is sufficient to resist the loosening tendency caused by the axial load to achieve thread self-locking, thereby further ensuring the stability of the positions of the driving sleeve 3 and the locking ring 2. In some embodiments, the excitation ring 4 is detachably connected with a grease nipple, and lubricating oil is injected into the threaded connection between the excitation ring 4 and the tool body 1 through the grease nipple.

[0026] Preferably, one end of the excitation ring 4 close to the driving sleeve 3 is detachably connected with a fixing ring 5, and a circular protrusion is arranged on the side of the driving sleeve 3 close to the excitation ring 4, and the circular protrusion is clamped between the excitation ring 4 and the fixing ring 5; in this embodiment, the circular protrusion of the driving sleeve 3 is clamped by the excitation ring 4 and the fixing ring 5, so as to realize the detachable connection between the excitation ring 4 and the driving sleeve 3. In some embodiments, the fixing ring 5 and the excitation ring 4 are connected by a second screw.

[0027] Preferably, wear-resistant rings 6 are arranged between the circular protrusion and the excitation ring 4 and between the circular protrusion and the fixing ring 5. The wear-resistant rings 6 are replaceable components, and the mechanical wear between the circular protrusion and the excitation ring 4 and between the circular protrusion and the fixing ring 5 is reduced through the wear-resistant rings 6, so as to extend the service life of the lifting tool.

[0028] Further optimization solution: a first threaded hole 7 and a second threaded hole 8 are provided on one side of the working end of the tool body 1, and a third threaded hole 9 is provided on the excitation ring 4; when a first screw is connected between the first threaded hole 7 and the third threaded hole 9, the distance between the inner wall of the locking ring 2 and the axis of the tool body 1 is the first distance, and at this time the locking ring 2 is in an unexcited state; when a first screw is connected between the second threaded hole 8 and the third threaded hole 9, the distance between the inner wall of the locking ring 2 and the axis of the tool body 1 is the second distance, and at this time the locking ring 2 is in an excited state; and the first distance is less than the second distance. In this embodiment, the excitation ring 4 is rotated to make the excitation ring 4 move along the axis direction of the tool body 1, so as to control the state switching of the locking ring 2 between the unexcited state and the excited state; after the state switching is completed, by controlling the corresponding arrangement of the first threaded hole 7 and the third threaded hole 9 and connecting the first screw, or controlling the corresponding arrangement of the second threaded hole 8 and the third threaded hole 9 and connecting the first screw, the stability of the positions of the drive sleeve 3 and the locking ring 2 is further ensured. And by controlling the positions of the first threaded hole 7 and the second threaded hole 8 relative to the tool body 1, the positions of the two threaded holes are at two ends of the sliding track of the drive sleeve 3, and the operator can ensure whether the drive sleeve 3 slides in place by whether the threaded holes correspond.

[0029] Preferably, a plurality of handles 10 are detachably connected to the radial outer side of the excitation ring 4. During operation, by rotating the handles 10, the excitation ring 4 is rotated, and the moment when the excitation ring 4 is rotated is extended through the handles 10, reducing the difficulty of rotating the excitation ring 4.

[0030] Further optimization solution: an annular groove is provided at the position of the lifting member 14 opposite to the locking ring 2, and an annular protrusion is provided on the radial outer side of the locking ring 2, and the lifting member 14 is clamped with the locking ring 2. In this embodiment, an annular protrusion is provided on the radial outer side of the locking ring 2, and the annular protrusion is clamped with the annular groove on the lifting member 14. While the two are clamped, the acting force applied by the drive sleeve 3 to the locking ring 2 along the radial direction of the tool body 1 is transmitted to the lifting member 14, thereby increasing the friction force between the locking ring 2 and the lifting member 14. The stable installation of the lifting member 14 on the outer side of the tool body 1 is jointly ensured by the clamping and the way of increasing the friction force. At the same time, when the tool body 1 and the lifting member 14 are separated, due to the clamping of the annular protrusion and the annular groove, the lifting member 14 restricts the axial movement of the locking ring 2 along the tool body 1.

[0031] In some embodiments, a set screw is provided between the fixed sleeve 11 and the tool body 1 to further ensure the fixation of the position of the fixed sleeve 11 relative to the tool body 1.

[0032] For a further optimized solution, a guiding ring 13 is detachably connected to the end of the working end of the tool body 1, and the outer diameter of the guiding ring 13 is smaller than the inner diameter of the component 14 to be lifted. The guiding ring 13 and the tool body 1 are detachably connected by a third screw. When it is necessary to install the tool body 1 and the component 14 to be lifted, after aligning the component 14 to be lifted with the tool body 1, since the outer diameter of the guiding ring 13 is smaller than the inner diameter of the component 14 to be lifted, the guiding ring 13 plays a guiding role.

[0033] The descriptions of the above embodiments are only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

[0034] It should be understood that the term "and / or" used herein is only a kind of association relationship describing associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0036] The above-described embodiments are only descriptions of the preferred modes of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A lifting tool, characterized in that, include: A tool body (1), the tool body (1) being provided with a lifting end and a working end which are arranged opposite to each other, the lifting end of the tool body (1) being used for connecting to a lifting tool, and the working end of the tool body (1) being detachably connected to a part to be lifted; A locking ring (2), the locking ring (2) being sleeved on the radially outer side of the working end of the tool body (1); A drive assembly, the drive assembly comprising a drive sleeve (3), the drive sleeve (3) being slidably disposed between the tool body (1) and the locking ring (2), the drive sleeve (3) being provided with a drive section, the distance between the outer wall of the drive section and the axis of the tool body (1) gradually increasing from the working end to the lifting end, and based on the sliding of the drive sleeve (3), the drive sleeve (3) exerts a force on the locking ring (2) in the radial direction of the tool body (1); The drive sleeve (3) is detachably connected to an excitation ring (4), the excitation ring (4) is sleeved on the radially outer side of the tool body (1), and the excitation ring (4) and the tool body (1) are threadedly connected, and based on the rotation of the excitation ring (4), the drive sleeve (3) moves axially along the tool body (1); A fixing sleeve (11) is sleeved radially outside the tool body (1), and the fixing sleeve (11) is threadedly connected to the tool body (1); a side of the fixing sleeve (11) close to the driving sleeve (3) is fixedly connected to a limiting sleeve (12), a sliding channel for the driving sleeve (3) to slide is provided between the limiting sleeve (12) and the tool body (1), and a side of the limiting sleeve (12) facing away from the fixing sleeve (11) is in contact with the locking ring (2); the limiting sleeve (12) limits the axial movement of the locking ring (2) along the tool body (1).

2. The lifting tool according to claim 1, characterized in that, One end of the excitation ring (4) close to the drive sleeve (3) is detachably connected to a fixing ring (5), and a side of the drive sleeve (3) close to the excitation ring (4) is provided with an annular protrusion, and the annular protrusion is clamped between the excitation ring (4) and the fixing ring (5).

3. The lifting tool according to claim 2, characterized in that, Wear-resistant rings (6) are provided between the annular protrusion and the excitation ring (4), and between the annular protrusion and the fixing ring (5).

4. The lifting tool according to claim 1, wherein, A first threaded hole (7) and a second threaded hole (8) are provided on one side of the working end of the tool body (1), and a third threaded hole (9) is provided on the excitation ring (4); when a first screw is connected between the first threaded hole (7) and the third threaded hole (9), the distance between the inner wall of the locking ring (2) and the axis of the tool body (1) is a first distance; when a first screw is connected between the second threaded hole (8) and the third threaded hole (9), the distance between the inner wall of the locking ring (2) and the axis of the tool body (1) is a second distance; the first distance is smaller than the second distance.

5. The lifting tool according to claim 1, wherein A plurality of handles (10) are detachably connected to the radial outer side of the excitation ring (4).

6. The lifting tool according to claim 1, characterized in that, The to-be-lifted part is provided with an annular groove at a position opposite to the locking ring (2), and an annular protrusion is arranged on the radial outer side of the locking ring (2), and the to-be-lifted part is clamped with the locking ring (2).

7. The lifting tool according to claim 1, characterized in that, The tool body (1) is detachably connected with a guide ring (13) at the end of the working end, and the outer diameter of the guide ring (13) is smaller than the inner diameter of the to-be-lifted part.

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