CN111960260A

CN111960260A - Hoisting tool

Info

Publication number: CN111960260A
Application number: CN202010761922.XA
Authority: CN
Inventors: 薄涵亮; 姜胜耀; 张亚军; 王金海; 秦本科; 赵陈儒; 刘潜峰
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2020-11-20

Abstract

The invention relates to the field of mechanical disassembling and assembling tools, and provides a hoisting tool, which comprises: the connecting component is rotatably connected with a plurality of clamping pieces; the movable sleeve is sleeved on the outer side of the connecting part and is suitable for moving along the axial direction of the connecting part so as to enable the clamping pieces to be switched between a clamping position where the clamping pieces are close to each other and an opening position where the clamping pieces are far away from each other, the movable sleeve presses a first surface of a first end of each clamping piece at the opening position, the movable sleeve presses a second surface of a second end of each clamping piece at the clamping position, and an included angle is formed between the first surface and the second surface; the hoisting part is connected to the connecting part. The hoisting tool provided by the invention can realize the switching of the clamping piece between two states by switching the movable sleeve between the first surface and the second surface, has a simple structure and is suitable for hoisting a control rod.

Description

Hoisting tool

Technical Field

The invention relates to the technical field of mechanical disassembling and assembling tools, in particular to a hoisting tool.

Background

In the related technology of mechanical part installation, a structure with a large volume and a large weight in large-scale equipment needs to be hoisted, but hoisting parts (such as hoisting rings) are difficult to directly arrange on most mechanical parts, so that the mechanical parts are difficult to directly hoist. Taking the installation of a control rod in a nuclear reactor as an example, the lifting ring is inconvenient to arrange on the control rod, and the problem that how to install the control rod is troubling technical personnel is solved. In the related technology of mechanical component assembly, a hoisting tool special for the control rod is not found, and the hoisting problem of the control rod is troubled for a long time for technicians.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a hoisting tool which can realize the switching of the clamping piece between two states by switching the movable sleeve between the first surface and the second surface, has a simple structure and is suitable for hoisting a control rod.

A lifting tool according to an embodiment of the present invention includes:

the connecting part is rotatably connected with a plurality of clamping pieces;

the movable sleeve is sleeved on the outer side of the connecting part and is suitable for moving along the axial direction of the connecting part so as to enable the clamping pieces to be switched between a clamping position where the clamping pieces are close to each other and an opening position where the clamping pieces are far away from each other, the movable sleeve presses a first surface of a first end of each clamping piece at the opening position, the movable sleeve presses a second surface of a second end of each clamping piece at the clamping position, and an included angle is formed between the first surface and the second surface;

and the hoisting part is connected to the connecting part.

According to one embodiment of the invention, the connecting part comprises a plurality of positioning parts sleeved outside the connecting shaft on the control rod, and the ends of the positioning parts are provided with guide surfaces to guide the connecting shaft to be inserted into the connecting part.

According to one embodiment of the invention, the guide surfaces are provided as arcuate surfaces to form the ends of the connecting members into an open configuration.

According to an embodiment of the present invention, the outer side of the positioning portion is provided with a protruding portion, and in the clamping position, the movable sleeve abuts against the protruding portion.

According to an embodiment of the present invention, the connecting member includes a limiting portion for limiting an axial position of the connecting shaft, the limiting portion is connected to an inner side of the positioning portion, and the connecting shaft abuts against the limiting portion, so that the clamping member clamps the connecting shaft.

According to one embodiment of the invention, the clamping piece is arranged between the two positioning parts, and two sides of the clamping piece are respectively and rotatably connected with the positioning part on one side of the clamping piece.

According to one embodiment of the present invention, the movable sleeve is provided with a first sliding groove, and the first end of the clamping member is adapted to move along the first sliding groove.

According to one embodiment of the invention, one of the connecting member and the moving sleeve is provided with a guide portion, and the other is provided with a positioning member movable along the guide portion.

According to one embodiment of the invention, the clamping piece is provided with a plurality of clamping parts matched with the grooves on the connecting shaft, and the clamping parts are arranged along the axial direction of the connecting part.

According to one embodiment of the present invention, the connecting member includes a first connecting member to which the plurality of holding members are rotatably connected and a second connecting member through which the first connecting member is connected to the hoisting part.

One or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

the hoisting tool provided by the embodiment of the invention comprises a connecting part, a movable sleeve and a hoisting part, wherein the hoisting part is fixed on the connecting part, the movable sleeve is sleeved outside the connecting part, the connecting part is rotatably connected with a plurality of clamping pieces, and the state transition of the clamping pieces is realized by switching the movable sleeve between a first surface and a second surface sleeved on the clamping pieces; the method not only meets the engineering application of the control rod built-in water pressure driving technology on the advanced small water reactor with the thermal power of 50-300MW, ensures the engineering application of the control rod built-in water pressure driving technology, provides reference for the engineering design of hoisting of the slender rod structure in other industrial fields, and can realize engineering and productization.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a hoisting tool provided in an embodiment of the present invention; wherein the clamp is in an open position;

fig. 2 is a schematic structural diagram of a hoisting tool provided in an embodiment of the present invention; wherein the clamping member is in a clamping position;

fig. 3 is a schematic structural diagram of a first connecting piece of the hoisting tool provided by the embodiment of the invention;

fig. 4 is a schematic structural diagram of a movable sleeve of a hoisting tool provided by an embodiment of the invention, wherein the diagram angle does not show the position of the second chute;

figure 5 is a schematic structural view of a clamping member of a hoisting tool provided by an embodiment of the invention;

fig. 6 is a schematic structural view of a clamping member of a hoisting tool provided by an embodiment of the invention, which is different from fig. 5 in angle;

fig. 7 is a structural schematic diagram of a disassembled state of the hoisting tool provided by the embodiment of the invention.

Reference numerals:

1: a first connecting member; 11: a positioning part; 111: a guide surface; 12: a limiting part; 13: a projection; 14: rotating the connecting piece; 15: a first mounting hole;

2: a second connecting member; 21: a set screw;

3: a clamping member; 31: a first end; 311: a first surface; 32: a second end; 321: a second surface; 33: a second mounting hole; 34: a clamping part;

4: moving the sleeve; 41: a first chute; 42: a second chute;

5: a hoisting ring;

6: a control rod; 61: a connecting shaft; 611: and (4) a groove.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the embodiments of the present invention, it should be noted that the terms "central", "longitudinal", "lateral", "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only used for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be configured in a specific orientation, and operate, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

One embodiment of the present invention, as shown in fig. 1 to 7, provides a lifting tool, including: connecting part, movable sleeve 4 and hoist and mount portion. The connecting part is rotatably connected with a plurality of clamping pieces 3; the movable sleeve 4 is sleeved outside the connecting part, the movable sleeve 4 is suitable for moving along the axial direction of the connecting part so as to enable the plurality of clamping pieces 3 to be switched between a clamping position where the clamping pieces are close to each other and an opening position where the clamping pieces are far away from each other, in the opening position, the movable sleeve 4 presses the first surface 311 of the first end 31 of each clamping piece 3, in the clamping position, the movable sleeve 4 presses the second surface 321 of the second end 32 of each clamping piece 3, and an included angle is formed between the first surface 311 and the second surface 321; the hoisting part is connected to the connecting part.

When a workpiece to be hoisted needs to be hoisted, at the moment, the hoisting tool is in a state of waiting to be hoisted, the clamping pieces 3 are adjusted from the clamping positions to the opening positions, the clamping pieces 3 are enabled to be in the opening states, at the moment, the workpiece to be hoisted can enter between the clamping pieces 3, then the clamping pieces 3 are adjusted from the opening positions to the clamping positions, the clamping pieces 3 are enabled to be folded under the sleeving pressure of the movable sleeve 4 so as to limit the workpiece to be hoisted among the clamping pieces 3, the hoisting tool is switched from the state of waiting to be hoisted to the hoisting state, the workpiece to be hoisted is limited and fixed by the clamping pieces 3 and can move synchronously with the hoisting tool, and the workpiece to be hoisted can be hoisted through a hoisting tool (such as a crane or a crane).

When the hoisting tool of the embodiment is not used, the hoisting tool is in a state to be hoisted, the plurality of clamping pieces 3 can be adjusted to the clamping position, and the movable sleeve 4 can play a role in protecting the clamping pieces 3; however, the state of the clamp 3 is not limited to the clamped position, and may be selected as needed, or may be an opened position. Wherein, the switching of holder 3 between clamping position and open position is realized through the relative motion of movable sleeve 4 and adapting unit, and at this moment, can be with adapting unit fixed, adjust movable sleeve 4, and the structure is nimble and adjust portably.

Wherein, hoist and mount portion connects in adapting unit, and a plurality of positions of adapting unit can be located to hoist and mount portion, and hoist and mount position is more nimble, various. The cross section of the connecting part can be circular, oval, rectangular or other shapes, and the cross section is a section perpendicular to the axial direction of the connecting part, and the axial direction can refer to the length direction of fig. 1. The hoisting tool of this embodiment can be applied to the multiple work piece of treating to hoist, and size, shape of holder 3 can be designed according to the size, the shape of the work piece of treating to hoist to satisfy the hoist and mount of the work piece of treating to hoist.

The first surface 311 and the second surface 321 form an acute angle, and the first surface 311 and the second surface 321 are sleeved by the movable sleeve 4 to perform an external force, so that the clamping member 3 is rotationally adjusted, and the clamping member 3 is switched between the clamping position and the opening position. The angles of the first surface 311 and the second surface 321 at the two ends of the clamping piece 3 are different, in order to make the movable sleeve 4 fit outside the first surface 311, the clamping piece 3 makes the first surface 311 fit the inner wall of the movable sleeve 4 by rotating relative to the connecting part, and the rotation process of the clamping piece 3 makes the clamping piece 3 switch between the clamping position and the opening position; likewise, in order to make the mobile sleeve 4 abut on the outside of the second surface 321, the gripper 3 is also rotated with respect to the connection member, the process of rotation of the gripper 3 being such that the gripper 3 switches between the gripping position and the opening position.

The present embodiment will be specifically described below by taking as an example the application of the hoisting tool of the present embodiment to hoisting of a control rod 6 in a nuclear reactor.

When the workpiece to be hoisted is the control rod 6, the end of the control rod 6 is provided with the connecting shaft 61, the connecting shaft 61 is provided with the groove 611, and the clamping piece 3 is provided with the clamping part 34 matched with the groove 611. The hoisting tool of the embodiment is in a state to be hoisted, the clamping members 3 are adjusted to the open position (that is, the movable sleeve 4 is pulled upward relative to the connecting member as shown in fig. 2 to 1), the clamping members 3 are opened to insert the connecting shaft 61 between the plurality of clamping members 3, and then the movable sleeve 4 is adjusted to the clamping position (that is, the movable sleeve 4 is pushed downward as shown in fig. 1 to 2), so that the clamping members 3 clamp the connecting shaft 61, the fixing of the control rod 6 and the hoisting tool is realized, and the control rod 6 can be hoisted by the hoisting tool, and the installation and the movement of the control rod 6 are simpler and more convenient.

In one embodiment, as shown in fig. 1 to 3, the connecting member includes a plurality of positioning portions 11 for being sleeved outside the connecting shaft 61 on the control rod 6, and ends of the plurality of positioning portions 11 are provided with guide surfaces 111 to guide the insertion of the connecting shaft 61 into the connecting member. The positioning part 11 is used for limiting and positioning the connecting shaft 61, so that the connecting shaft 61 is accurately positioned in the connecting part, and the guide surface 111 can lead the connecting shaft 61 to be quickly and accurately inserted into the connecting part.

Referring to the following embodiments, referring to fig. 1 to 3, the connecting member includes a first connecting member 1 and a second connecting member 2, and the following embodiments will be described by taking an example in which the positioning portion 11, the limiting portion 12, the protruding portion 13, and the like are provided in the first connecting member 1.

Referring to fig. 3, a plurality of positioning portions 11 are uniformly distributed in the circumferential direction of the first connecting member 1, adjacent positioning portions 11 are separated by a groove body, a clamping member 3 is arranged in the groove body, the positioning portions 11 and the clamping member 3 are matched to accurately position the connecting shaft 61, and the structure is simple.

In one embodiment, the guide surface 111 is provided as an arc surface to form an open structure at the end of the connection member, facilitating accurate insertion of the connection shaft 61 into the first connection member 1 of the connection member.

Wherein the arc surface is a spherical surface, the guiding effect of the spherical surface is good, and the contact resistance is reduced. The positioning parts 11 are provided in plural on the first connecting member 1, and the number of the positioning parts 11 is the same as that of the clamping members 3. Referring to fig. 3, the positioning parts 11 are uniformly arranged in four directions along the circumference of the first connecting member 1, and the guide surfaces 111 are arranged so that the ends of the positioning parts 11 form a spherical column structure, which facilitates the remote docking of the hoisting tool with the control rod 6.

Of course, the guide surface 111 is not limited to an arc surface, but may be an inclined plane, and the end of the connecting member may be formed in an open structure to perform a guiding function.

In one embodiment, the outer side of the positioning portion 11 is provided with a protrusion 13, and in the clamping position, the moving sleeve 4 abuts against the protrusion 13. The protruding part 13 limits and positions the movable sleeve 4, and ensures that the movable sleeve 4 accurately corresponds to the second surface 321 of the second end 32 of the clamping member 3, so that the movable sleeve 4 is accurately sleeved on the outer side of the second surface 321, and meanwhile, the protruding part 13 also plays a role in supporting the movable sleeve 4.

The protrusion 13 in this embodiment and the second sliding groove 42 in the following embodiments simultaneously have a limiting and positioning function for the moving sleeve 4, and have a dual function, so that the position of the moving sleeve 4 is more stable.

In one embodiment, the connecting member includes a limiting portion 12 for limiting the axial position of the connecting shaft 61, the limiting portion 12 is connected to the inner side of the positioning portion 11, and the connecting shaft 61 abuts against the limiting portion 12, so that the clamping member 3 clamps the connecting shaft 61. When the connecting shaft 61 is inserted into the connecting part, the limiting part 12 limits the height position of the connecting shaft 61, so that the groove 611 on the connecting shaft 61 accurately corresponds to the clamping part 34 on the clamping piece 3, the clamping deviation of the clamping piece 3 is reduced, and the clamping accuracy of the clamping piece 3 is improved.

As shown in fig. 2, the stopper portion 12 is a block structure inside the connection member, and the top surface of the connection shaft 61 abuts against the lower surface of the stopper portion 12.

In one embodiment, the clamping member 3 is disposed between two positioning portions 11, and both sides of the clamping member 3 are respectively rotatably connected to the positioning portions 11 on one side thereof. The clamping piece 3 is matched with the positioning part 11 to circumferentially limit the connecting shaft 61, and the clamping piece 3 is convenient to mount.

The first connecting piece 1 is provided with a first mounting hole 15, the clamping piece 3 is provided with a second mounting hole 33, the first mounting hole 15 and the second mounting hole 33 are connected with the rotating connecting piece 14 in a penetrating manner, the rotating connecting piece 14 is fixed in the first mounting hole 15, and the clamping piece 3 is rotatably connected with the rotating connecting piece 14; or the rotating connecting piece 14 is rotatably connected with the first mounting hole 15, the clamping piece 3 is fixed on the rotating connecting piece 14, and the connection mode can be selected according to requirements. Wherein, the first mounting hole 15 is provided on the positioning portion 11.

In one embodiment, as shown in fig. 1 to 7, the movable sleeve 4 is provided with a first sliding slot 41, and the first end 31 of the clamping member 3 is adapted to move along the first sliding slot 41. The first surface 311 of the clamp 3 moves to a surface abutting the lower end of the moving sleeve 4, the clamp 3 is located at the open position, the first surface 311 of the clamp 3 moves to the upper end of the first runner 41, and at this time, the second surface 321 of the clamp 3 moves to a surface abutting the lower end of the moving sleeve 4, and the clamp 3 is located at the clamping position. The first end 31 of the clamping member 3 slides in the first sliding groove 41, which helps to reduce the friction between the clamping member 3 and the moving sleeve 4 and improves the moving flexibility of the clamping member 3.

The first slide grooves 41 are provided in plurality in the circumferential direction of the moving sleeve 4, and the number of the first slide grooves 41 is the same as that of the grippers 3. Referring to fig. 3, four positioning portions 11 are provided on the first connecting member 1, four clamping members 3 are provided on the first connecting member 1, and four first sliding grooves 41 are provided.

In one embodiment, the clamping member 3 is provided with a plurality of clamping portions 34 matched with the grooves 611 of the connecting shaft 61, and the clamping portions 34 are arranged along the axial direction of the connecting part, so that multi-stage clamping is realized, and the clamping effect of the clamping member 3 and the connecting shaft 61 is better.

The clamping portion 34 of the clamping piece 3 is provided with two protrusions, two annular grooves matched with the protrusions are formed in the axial direction of the connecting shaft 61, the clamping piece 3 is clamped and fixed with the connecting shaft 61 in two stages, and the clamping piece 3 and the connecting shaft 61 can be accurately clamped and fixed in place without the problem of half clamping.

In one embodiment, as shown in fig. 1 and 2, one of the connecting member and the moving sleeve 4 is provided with a guide portion, and the other is provided with a positioning member movable along the guide portion. The guide portion cooperates with the positioning member to guide the relative movement of the connecting member and the movable sleeve 4, so as to ensure the stability of the relative movement of the connecting member and the movable sleeve 4.

In the open position the positioning element is positioned at the first end of the guide and in the clamping position the positioning element is positioned at the second end of the guide to ensure a relative fixation of the connecting member and the moving sleeve 4. The guides determine the relative displacement and mutual positioning of the connecting member and the moving sleeve 4.

Wherein, the connecting part and the movable sleeve 4 need to be kept stably and fixedly at the opening position to ensure the safety and stability of the hoisting process, for example, the fixing is performed by bolts, clamping, manual or external force, and the like, as shown in fig. 4, the top of the movable sleeve 4 is provided with a connecting hole, and the movable sleeve 4 can be fixed on the connecting part by a screw, a pin and other parts penetrating through the connecting hole. The connecting member and the movable sleeve 4 can be fixed at the clamping position by hand, external force or by a positioning member at the second end of the guiding portion, and the fixing manner of the connecting member and the movable sleeve 4 at the clamping position is not limited herein.

In one embodiment, the positioning member is a positioning screw 21 fixed to the connecting member, and the guiding portion is a second sliding slot 42 provided in the moving sleeve 4, so that the structure is simple and the installation is simple. One or more second chutes 42 are provided on the moving sleeve 4, and the number of the second chutes 42 can be selected as needed.

In one embodiment, as shown in fig. 1 and 2, the connecting member includes a first connecting member 1 and a second connecting member 2, the plurality of clamping members 3 are rotatably connected to the first connecting member 1, and the first connecting member 1 is connected to the sling portion through the second connecting member 2. The connecting part is arranged into a first connecting piece 1 and a second connecting piece 2, the first connecting piece 1 and the second connecting piece 2 can be processed independently, the length of each part can be shortened, and transportation is facilitated.

Wherein, the one end of first connecting piece 1 is connected to the one end of second connecting piece 2, and hoist and mount portion is connected to the other end of second connecting piece 2, and the other end of first connecting piece 1 sets up location portion 11 and bulge 13. The first connecting piece 1 and the second connecting piece 2 can be fixed in a threaded connection mode, a welding mode or a clamping mode and the like.

Of course, the connecting part is not limited to include the first connecting piece 1 and the second connecting piece 2, and the connecting part may further include more parts, and the connecting part may be divided into multiple sections along the length direction as required, so as to facilitate transportation and independent processing.

In one embodiment, as shown in fig. 1, 2 and 7, the sling portion includes a sling 5, and the sling 5 is fixed to the connecting member. The clamping piece 3 is connected to one end of the connecting part to fix a workpiece to be hoisted, and the hoisting ring 5 is fixed to the other end of the connecting part to facilitate hoisting of the hoisting tool. The hoisting ring 5 can be connected to the connecting part in a welding mode, a threaded connection mode and the like, and is simple and convenient to process and stable in connection.

The two ends of the connecting component are the two ends in the length direction, and as shown in fig. 1, one end is the lower end of the connecting component, and the other end is the upper end of the connecting component.

The lifting device in the above embodiment realizes the lifting function of the control rod 6, solves the lifting problem of the control rod 6 without lifting lugs and the matching problem of the reactor core structure, ensures the lifting precision, has the characteristics of simple structure and convenient operation, is suitable for lifting the control rods 6 with various specifications, is especially suitable for lifting the cross wing control rods, and solves the lifting problem of the cross wing control rods. Moreover, the hoisting tool in the embodiment does not need a spring; the structure of holder 3 matches with the four arris grooves of control rod 6, need not to set up control rod 6 to non-arris structure, has solved the reactor and has refueled the problem that must demolish control rod 6 earlier.

Based on the working principle of a driving mechanism in a nuclear reactor, the characteristics of a built-in control rod driving wire of a thermal power 50-300MW advanced integrated small water reactor and the assembly and disassembly experience, the lifting tool in the embodiment not only meets the engineering application of a control rod built-in water pressure driving technology on the thermal power 50-300MW advanced small water reactor, ensures the engineering application of the control rod built-in water pressure driving technology, provides reference for the engineering design of lifting of a slender rod structure in other industrial fields, and can realize engineering and productization.

The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.

Claims

1. A lifting tool, comprising:

the connecting part is rotatably connected with a plurality of clamping pieces;

and the hoisting part is connected to the connecting part.

2. The hoisting tool of claim 1 wherein the connection member includes a plurality of positioning portions for fitting outside the connection shaft on the control rod, and ends of the plurality of positioning portions are provided with guide surfaces for guiding the insertion of the connection shaft into the connection member.

3. A lifting tool according to claim 2, characterised in that the guide surface is provided as an arcuate surface to give the end of the connecting member an open configuration.

4. Hoisting tool according to claim 2, characterized in that the positioning part is provided with a projection on its outer side, against which projection the moving sleeve abuts in the clamping position.

5. The hoisting tool of claim 2, wherein the connecting member comprises a limiting portion for limiting the axial position of the connecting shaft, the limiting portion is connected to the inner side of the positioning portion, and the connecting shaft abuts against the limiting portion, so that the clamping member clamps the connecting shaft.

6. The hoisting tool of claim 2, wherein the clamping member is disposed between the two positioning portions, and two sides of the clamping member are rotatably connected to the positioning portions on one side thereof, respectively.

7. Hoisting tool according to any one of claims 1-6, wherein the travelling sleeve is provided with a first runner, the first end of the clamping member being adapted to travel along the first runner.

8. Hoisting tool according to any one of claims 1-6, characterized in that one of the connecting part and the travelling sleeve is provided with a guide and the other with a positioning element movable along the guide.

9. The hoisting tool of any one of claims 2 to 6, wherein the clamping member is provided with a plurality of clamping portions adapted to the grooves on the connecting shaft, and the plurality of clamping portions are arranged along the axial direction of the connecting member.

10. The lifting tool according to any one of claims 1 to 6, wherein the connecting member comprises a first connecting member and a second connecting member, the plurality of clamping members are rotatably connected to the first connecting member, and the first connecting member is connected to the lifting portion through the second connecting member.