sling

Abstract

The embodiment of the present application discloses a lifting appliance used for connecting with hoisting equipment to hoist a to-be-lifted piece. Wherein, the to-be-lifted piece is fixed with a hoisting part, the lifting appliance comprises a connecting piece, one end of the connecting piece is formed with a positioning hole, the positioning hole is used for accommodating the hoisting part when the to-be-lifted piece is connected, a hoisting piece is connected to the other end of the connecting piece away from the positioning hole, the hoisting piece is used for connecting the hoisting equipment, a clamping assembly is arranged in the connecting piece and coaxially arranged with the positioning hole, the clamping assembly is arranged to be switched between a clamping state and an open state, and the clamping assembly is used for clamping the hoisting part in the clamping state.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of hoisting devices, and particularly relate to a lifting device. BACKGROUND

[0002] In order to ensure normal operation and maintenance of mechanical equipment, it is necessary to hoist and dismount parts of the mechanical equipment. In hoisting operation, in addition to heavy hoisting equipment such as a crane, a special lifting device needs to be provided to facilitate hoisting and dismounting of parts of the mechanical equipment.

[0003] For parts provided with a lifting point of a protruding structure, a special lifting device needs to be used to hoist the parts to meet the requirement of hooking and hoisting. Therefore, it is necessary to design a lifting device which is convenient to hook and flexible to operate. SUMMARY

[0004] According to an aspect of the present application, a lifting device is provided for connecting with hoisting equipment to hoist a hoisted part. The hoisted part is fixed with a hoisting part. The lifting device comprises: a connecting part, one end of the connecting part is formed with a positioning hole for accommodating the hoisting part when the hoisted part is connected; a hoisting part connected to the other end of the connecting part away from the positioning hole, the hoisting part is used to connect the hoisting equipment; a clamping assembly arranged in the connecting part and coaxially arranged with the positioning hole, the clamping assembly is arranged to switch between a clamping state and an open state, and the clamping assembly is used to clamp the hoisting part in the clamping state.

[0005] The lifting device in the embodiments of the present application is used. The positioning hole for accommodating the hoisting part is arranged at one end of the connecting part. The connecting part can be automatically positioned on the protruding hoisting part of the hoisted part in hoisting operation, so that the clamping assembly in the connecting part can clamp the hoisting part. The connecting part and the hoisting part can be connected without precise positioning, and the operation is convenient and flexible. At the same time, in hoisting operation, the displacement between the lifting device and the hoisted part can be prevented by cooperation between the positioning hole and the hoisting part, the hooking between the lifting device and the hoisted part is ensured to be firm, and the safety in hoisting operation is improved. BRIEF DESCRIPTION OF DRAWINGS

[0006] Other objects and advantages of the present application will be more fully apparent from the following description of embodiments of the present application, taken in conjunction with the accompanying drawings.

[0007] Figure 1 is a structural schematic view of a lifting device according to an embodiment of the present application.

[0008] Figure 2 is Figure 1 is a structural schematic view of another view of the lifting device in is a structural schematic view of another view of the lifting device in

[0009] Figure 3 is a structural schematic diagram of a connecting piece according to an embodiment of the present application.

[0010] Figure 4 is Figure 3 is a structural schematic diagram of another view of the connecting piece in

[0011] Figure 5 is Figure 3 is a sectional view of the connecting piece A in

[0012] Figure 6 is Figure 3 is a sectional view of the connecting piece B in

[0013] Figure 7 is a structural schematic diagram of a clamping piece according to an embodiment of the present application.

[0014] Figure 8 is a structural schematic diagram of a transmission piece according to an embodiment of the present application.

[0015] Figure 9 is a structural schematic diagram of an operating piece according to an embodiment of the present application.

[0016] Figure 10 is Figure 9 is an installation schematic diagram of the operating piece in

[0017] Figure 11 is Figure 9 is a structural schematic diagram of another view of the operating piece in

[0018] Figure 12 is an application scenario schematic diagram of a lifting appliance in a clamping state according to an embodiment of the present application.

[0019] Figure 13 is an application scenario schematic diagram of a lifting appliance in an open state according to an embodiment of the present application.

[0020] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are merely shown in a schematic manner so as not to affect the understanding of the reader. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are one embodiment of the present application, rather than all the embodiments. Based on the described embodiments of 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] It should be noted that the technical terms or scientific terms used in the present application should be understood as the general meaning understood by those skilled in the art to which the present application belongs, unless otherwise defined. If the description of "first", "second", etc. is involved throughout the text, the "first", "second", etc. is only used to distinguish similar objects, and cannot be understood as indicating or implying the relative importance, the order of precedence or implicitly indicating the number of the indicated technical features. It should be understood that the data of "first", "second", etc. can be interchanged under appropriate circumstances. If "and / or" appears throughout the text, it means that three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, in order to facilitate description, spatial relative terms such as "above", "below", "top", "bottom" and the like can be used herein, which are only used to describe the spatial position relationship of one device or feature with other devices or features as shown in the figure. It should be understood to include different orientations in use or operation in addition to the orientation shown in the figure.

[0023] During the maintenance of mechanical equipment, some components or parts need to be hoisted and disassembled. During hoisting operation, in addition to the hoisting equipment such as crane that must be provided, special lifting tools need to be set according to the lifting point structure provided on the different to-be-lifted pieces, so as to fix and hoist the to-be-lifted pieces.

[0024] In addition, for mechanical equipment in a radioactive environment, for example, shearing equipment used in spent fuel assembly reprocessing, personnel are generally prohibited from walking in during normal operation and maintenance of the mechanical equipment. When hoisting the parts of the mechanical equipment, a manipulator is needed to remotely control the lifting tool to connect it with the hoisting part of the to-be-lifted piece. A lifting tool that is convenient to operate needs to be designed to meet the remote hoisting requirement.

[0025] Figure 1 And Figure 2 A structural schematic diagram of a lifting tool according to an embodiment of the present application is shown. The lifting tool 100 is used to cooperate with a hoisting part provided on a to-be-lifted piece to carry the to-be-lifted piece. The lifting tool 100 can be connected with a hoisting equipment to hoist the to-be-lifted piece.

[0026] In the present embodiment, the to-be-lifted piece can be a shearing equipment used in spent fuel reprocessing and parts of the shearing equipment, so as to realize the hoisting and disassembly of the shearing equipment. The to-be-lifted piece is provided with a hoisting part. The lifting tool 100 in the present embodiment can cooperate with the hoisting part, so as to realize the hoisting operation of the to-be-lifted piece.

[0027] The lifting appliance 100 in the embodiment can be connected with a hoisting device to hoist the to-be-lifted member. The hoisting device can be a heavy hoisting device such as a crane, or can be other types of lifting appliances such as a lifting beam, a lifting belt, etc. The lifting appliance 100 can be directly connected with the crane to perform hoisting operation, or can be connected and cooperated with other lifting appliances, and then connected with the crane through the other lifting appliances to perform hoisting operation.

[0028] In some embodiments, the lifting appliance 100 can be applied in a hot cell, and can hoist parts of a mechanical device used in a spent fuel assembly post-processing process, so as to realize hoisting and dismounting of the mechanical device, and ensure normal operation and maintenance of the mechanical device. Specifically, the mechanical device can be a shearing device used for shearing the spent fuel assembly, and the to-be-lifted member can be a fixed knife in the shearing device. In the embodiment, the mechanical device such as the shearing device is arranged in the hot cell, and an operator cannot enter the hot cell to perform hoisting operation. In the embodiment, hoisting operation can be performed by clamping the lifting appliance 100 through a remote control operating device (such as a manipulator, etc.).

[0029] As shown in Figure 1 and Figure 2 , the lifting appliance 100 in the embodiment includes a lifting member 10, a connecting member 20, and a clamping assembly. One end of the connecting member 20 is formed with a positioning hole 21 for accommodating a lifting part when the to-be-lifted member is connected. The lifting member 10 is connected to the other end of the connecting member 20 away from the positioning hole 21, and is used to connect the hoisting device. The clamping assembly is arranged in the connecting member 20 and is coaxially arranged with the positioning hole 21, and is arranged to be switched between a clamping state and an open state, and is used to clamp the lifting part in the clamping state.

[0030] The lifting appliance 100 in the embodiment can be connected with a hoisting device to hoist the to-be-lifted member. The hoisting device can be a heavy hoisting device such as a crane, or can be other types of lifting appliances such as a lifting beam, a lifting belt, etc. The lifting appliance 100 can be directly connected with the crane to perform hoisting operation, or can be connected and cooperated with other lifting appliances, and then connected with the crane through the other lifting appliances to perform hoisting operation.

[0031] Referring to Figures 1 to 3The lifting member 10 in the embodiment is used to be connected with a lifting device to perform a lifting operation. Alternatively, the lifting member 10 can be a lifting ring which can be directly connected with a lifting hook of a crane or other lifting device to perform a lifting operation. The lifting ring can also be connected with other lifting appliances 100 (for example, a lifting beam, a lifting belt, etc.) to perform a lifting operation. The specific type of the lifting ring can be selected according to actual needs, so that the lifting appliance 100 can be used in combination with any other type of lifting appliance 100. For example, a lifting ring that matches the type of the lifting hook of the crane or the type of the lifting beam or the lifting belt can be selected.

[0032] As shown in Figure 3 and Figure 4 , the lifting member 10 includes a first reinforcing member 11 and a second reinforcing member 12 which are respectively arranged at two ends of the lifting member 10 and connected with the connecting member 20, so as to strengthen the connection strength between the thin lifting member 10 and the connecting member 20 and improve the reliability of the lifting appliance 100.

[0033] As shown in Figure 3 , Figure 5 , Figure 6 , the connecting member 20 is provided with a mounting hole 22 at an end away from the positioning hole 21, and the mounting hole 22 is coaxial with the positioning hole 21. Further, a receiving cavity 23 is arranged between the mounting hole 22 and the positioning hole 21, and the mounting hole 22 and the positioning hole 21 are communicated through the receiving cavity 23. The mounting hole 22 and the receiving cavity 23 are used to mount a clamping assembly.

[0034] In the embodiment, the mounting hole 22 coaxial with the positioning hole 21 is arranged in the connecting member 20, so that the clamping assembly mounted in the mounting hole 22 can accurately clamp the lifting part positioned in the positioning hole 21. Meanwhile, the receiving cavity 23 is arranged in the embodiment to provide a movement space for the clamping assembly.

[0035] Referring to Figure 1 , the clamping assembly includes a transmission member 30 and at least two clamping members 40. The transmission member 30 is arranged in the mounting hole 22 and extends into the receiving cavity 23, and the transmission member 30 is arranged to be movable along the axial direction of the mounting hole 22. The clamping members 40 are rotatably connected in the receiving cavity 23, for example, connected to the inner wall of the connecting member through a pin shaft. The clamping members 40 are symmetrically arranged on both sides of the transmission member 30 and cooperated with the transmission member 30. The transmission member 30 is arranged to drive the clamping members 40 to rotate when moving, so as to switch between a clamping state and an open state.

[0036] In the embodiment, the opening or clamping of the clamping member 40 can be realized by moving the transmission member 30 in the axial direction of the mounting hole 22. In some embodiments, the transmission member 30 extends out of the connecting member 20, and the operator can remotely control the transmission member 30 to move, so as to realize the clamping of the clamping member 40 on the lifting part, so as to meet the remote lifting requirements of the to-be-lifted member in a radioactive environment.

[0037] As shown in Figure 7 , in some embodiments, the clamping member 40 is provided with a bearing part 41 close to one end of the lifting part, the bearing part 41 is matched with the lifting part, and the clamping member 40 is arranged to bear the lifting part to clamp the to-be-lifted member when in the clamping state.

[0038] Figure 12 and Figure 13 The application scenario schematic diagram of the lifting tool 100 according to an embodiment of the present application is shown. As shown in Figure 12 and Figure 13 , the to-be-lifted member 200 is provided with a lifting hole, and the lifting part 210 is fixed to the lifting hole. The lifting part 210 can be in a columnar shape, and a protrusion is arranged at the top end of the lifting part 210 in the circumferential direction of the lifting part 210.

[0039] The bearing part 41 of the clamping member 40 in the embodiment can abut against the lower surface of the protrusion, so as to realize the clamping of the lifting part 210. In some embodiments, the top of the lifting part 210 is arranged in an arc shape, so as to facilitate the automatic positioning of the lifting part 210 into the positioning hole 21 during the lifting operation.

[0040] As shown in Figure 8 , in some embodiments, the transmission member 30 includes a main body segment 31 and a limiting segment 32. The main body segment 31 is arranged in the mounting hole 22, and the limiting segment 32 is connected to one end of the main body segment 31 away from the lifting member 10. The limiting segment 32 is arranged to abut against the lifting part 210 when the clamping assembly is in the clamping state, so as to limit the movement of the transmission member 30 towards the lifting part 210. In the embodiment, the clamping member 40 is located around the limiting segment 32, and the movement range of the transmission member 30 is limited by the limiting segment 32, so as to realize the positioning between the clamping member 40 and the lifting part 210, so as to facilitate the clamping.

[0041] Further, a transmission part is arranged between the main body segment 31 and the limiting segment 32, one end of the clamping member 40 away from the lifting part 210 is provided with a first protruding part 42, and the transmission part is arranged to drive the clamping member 40 to rotate when moving relative to the first protruding part 42. In the embodiment, the rotation of the clamping member 40 is realized by the cooperation between the transmission part and the first protruding part 42, so as to switch between the clamping state and the open state.

[0042] Specifically, as shown in Figure 7 and Figure 8As shown, the clamping member 40 is provided with a connecting shaft 43, the two ends of which are connected to the connecting member 20, thereby allowing the clamping member 40 to rotate relative to the connecting member 20. The connecting shaft 43 is located between the first protrusion 42 and the bearing portion 41. The transmission portion includes a second protrusion 33, which is disposed between the main body section 31 and the limiting section 32. The size of the second protrusion 33 is consistent with the distance between the first protrusions 42 when the clamping member 40 is in the clamping state. The clamping assembly is configured such that when the transmission member 30 moves to the point where the second protrusion 33 abuts against the first protrusions 42, the clamping member 40 remains in the clamping state.

[0043] like Figure 12 As shown, in this embodiment, when the second protrusion 33 on the transmission member 30 moves between the first protrusions 42 of the two clamping members 40, the two ends of the second protrusion 33 abut against the first protrusions 42, so that the clamping member 40 remains in a vertical state, so that the clamping assembly switches to a clamping state and realizes the clamping of the lifting part 210.

[0044] Furthermore, the size of the limiting segment 32 is smaller than the distance between the first protrusions 42 when the clamping member 40 is in the open state. The clamping assembly is configured such that when the transmission member 30 moves to the point where the limiting segment 32 is located between the first protrusions 42, the clamping member 40 remains in the open state by its own weight.

[0045] like Figure 13 As shown, in this embodiment, when the second protrusion 33 on the transmission member 30 moves out of the space between the two first protrusions 42, the first protrusions 42 no longer maintain a vertical state due to the absence of external force. Furthermore, since the size of the limiting section 32 located between the clamping members 40 is small, it does not affect the rotation of the clamping members 40. The clamping members 40 can maintain an inclination by their own weight, so that the clamping assembly is in an open state.

[0046] like Figure 8 As shown, the transmission unit also includes a tapered portion 34. The tapered portion 34 is connected between the second protrusion 33 and the limiting section 32, and the clamping assembly is configured to drive the clamping member 40 to rotate when the tapered portion 34 moves relative to the first protrusion 42. In addition, the first protrusion 42 may be arc-shaped.

[0047] In this embodiment, when the transmission member 30 moves downward, the conical portion 34 moves downward relative to the first protrusion 42, and the distance between the two first protrusions 42 gradually increases, causing the first protrusions 42 to rotate away from the transmission member 30, while the bearing portion 41 at the bottom of the clamping member 40 rotates in the direction toward the lifting portion 210 until the second protrusion 33 above the conical portion 34 moves between the two first protrusions 42, at which point the clamping member 40 is in a clamping state.

[0048] Conversely, when the transmission member 30 moves upward, the tapered portion 34 moves upward relative to the first protruding portions 42, the distance between the two first protruding portions 42 gradually decreases, so that the first protruding portions 42 rotate towards the direction close to the transmission member 30, and the bearing portion 41 at the bottom of the clamping member 40 rotates towards the direction away from the lifting part 210, until the limiting section 32 below the tapered portion 34 moves between the two first protruding portions 42, the clamping member 40 is in the open state.

[0049] The embodiment sets the tapered portion 34, so that the tapered portion 34 cooperates with the first protruding portions 42 on the clamping member 40, so that the transmission member 30 can more smoothly drive the clamping member 40 to rotate during movement, saving time and effort.

[0050] In order to facilitate remote control of the clamping assembly to switch it between the clamping state and the open state, the lifting appliance 100 in the embodiment further comprises an operating member 50. As shown in Figure 1 The operating member 50 is connected with the transmission member 30, and the operating member 50 is used for clamping operation by an external operating device (for example, a manipulator) to drive the transmission member 30 to move along the axial direction of the mounting hole 22.

[0051] In some embodiments, the transmission member 30 extends out of the mounting hole 22 and is located between the first reinforcing member 11 and the second reinforcing member 12. One end of the operating member 50 is rotatably connected to the first reinforcing member 11, for example, can be hinged to the first reinforcing member 11 through a pin shaft 55. The other end of the operating member 50 close to the second reinforcing member 12 is provided with an operating portion 51, and an operator can remotely control the operating device (for example, a manipulator) to clamp the operating portion 51 to control the action of the operating member 50. Moreover, the operating member 50 is rotatably connected with the transmission member 30, and the operating member 50 is arranged to drive the transmission member 30 to move along the axial direction of the mounting hole 22 when the operating member 50 is rotated relative to the first reinforcing member 11.

[0052] The embodiment controls the rotation of the operating member 50 by the manipulator and other operating devices, and then drives the transmission member 30 to move, so as to realize the switching of the clamping member 40 between the clamping state and the open state, realizes the remote control of the lifting appliance 100, is suitable for use in a radioactive environment, and is convenient to operate. The hooking between the lifting appliance 100 and the lifting part 210 of the to-be-lifted member 200 is smooth, saving time and effort.

[0053] As shown in Figure 1 and Figure 3 As shown in Figure 9As shown, the operating member 50 is provided with a positioning portion 53 at a position corresponding to the positioning groove, and the operating member 50 is arranged such that when the operating member 50 is rotated to a position where the positioning portion 53 is located in the positioning groove, the clamping assembly is in a clamping state or an open state. Through the cooperation between the positioning groove and the positioning portion 53, the angle and position of the rotation of the operating member 50 are limited, and thus the movement distance of the transmission member 30 is limited, preventing over-movement and causing the clamping member 40 to be unable to be accurately clamped.

[0054] Specifically, the positioning groove includes a first positioning groove 121 and a second positioning groove 122, which are distributed along a direction parallel to the axial direction of the mounting hole 22, and the first positioning groove 121 is located on a side of the second positioning groove 122 away from the connecting member 20. The operating member 50 is arranged such that when the operating member 50 is rotated to a position where the positioning portion 53 is located in the first positioning groove 121, the clamping assembly is in an open state; and when the operating member 50 is rotated to a position where the positioning portion 53 is located in the second positioning groove 122, the clamping assembly is in a clamping state.

[0055] The embodiment is provided with two positioning grooves on the hoisting member 10, which correspond to two positions of the transmission member 30, i.e., positions of the transmission member 30 when the clamping member 40 is in an open state and a clamping state, facilitating remote control of the rotation of the operating member 50 to the position, and thus smoothly clamping the hoisting part 210.

[0056] Moreover, in the embodiment, the positioning groove cooperates with the positioning portion 53 to enable the operating member 50 to be positioned at the two positions, so that the clamping member 40 can be kept in a clamping state or an open state, avoiding displacement of the operating member 50 after the external operating device releases the operating member 50, and causing the clamping member 40 to be unable to be kept in the clamping state or the open state.

[0057] As shown in FIG. 1, Figure 10 The positioning portion 53 includes a housing 531 and a positioning bead 532 arranged in the housing 531, and the positioning bead 532 is connected with the inner surface of the housing 531 through an elastic member 533 (for example, a spring). When the positioning portion 53 is located in the positioning groove, the elastic member 533 is in an initial state, and the positioning column is abutted in the positioning groove, thereby avoiding displacement of the positioning column from the positioning groove. When the rotation of the operating member 50 is controlled, the positioning column slides out of the positioning groove and compresses the elastic member 533, avoiding the positioning column from hindering the rotation of the operating member 50.

[0058] In addition, as shown in FIG. 1, Figure 1 and Figure 3 The upper side of the first positioning groove 121 is further provided with a limiting protrusion 123 for blocking the upward rotation of the operating member 50, and the operating member 50 is further positioned, avoiding over-rotation of the operating member 50. Specifically, when the positioning portion 53 of the operating member 50 is located in the positioning groove, the upper surface of the operating member 50 is abutted against the limiting protrusion 123.

[0059] In some embodiments, the size of the transmission member 30 matches the shape and size of the mounting hole 22, i.e., the shape and size of the body section 31 are consistent with the shape and size of the mounting hole 22, so that the rotation of the operating member 50 can drive the transmission member 30 to move axially in the mounting hole 22, as shown in Figure 1 and Figure 8 In the present embodiment, the transmission member 30 is provided with a connecting hole 35 at a position corresponding to the operating member 50, and the connecting hole 35 extends in a direction perpendicular to the axial direction of the mounting hole 22, as shown in Figure 10 The operating member 50 is connected with a rotating shaft 54, and the rotating shaft 54 is arranged in the connecting hole 35. When the operating member 50 rotates, the rotating shaft 54 rotates in the connecting hole 35 and moves in a direction perpendicular to the axial direction of the mounting hole 22.

[0060] In the present embodiment, the connecting hole 35 is an oblong hole, and when the operating member 50 rotates, the rotating shaft 54 moves in the oblong hole, so that the transmission member 30 can move in the mounting hole 22, avoiding the limitation of the axial movement of the transmission member 30 by the mounting hole 22.

[0061] Further, as shown in Figure 11 The operating member 50 includes two symmetrical rotating arms 52, the transmission member 30 and the lifting member 10 are connected between the two rotating arms 52, the rotating arms 52 are rotatable relative to the transmission member 30 and the lifting member 10, and the operating part 51 is connected with the two rotating arms 52 respectively. In the present embodiment, the transmission member 30 is arranged between the two rotating arms 52, so that the two rotating arms 52 are simultaneously controlled to rotate relative to the transmission member 30 by the operating part 51, so that the transmission member 30 is uniformly stressed and displacement of the transmission member 30 in the radial direction is avoided.

[0062] The spreader 100 of the present embodiment has a compact structure, high structural strength, and flexible operation. When applied to remotely disassemble parts of a mechanical hand in a radiation environment, the hooking is smooth, time-saving and labor-saving, and can meet the requirements of remotely disassembling parts of equipment.

[0063] For the embodiments of the present application, it should be further noted that the embodiments of the present application and the features in the embodiments can be combined with each other to obtain new embodiments without conflict.

[0064] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A spreader, characterized in that, The lifting tool is used for being connected with a lifting device to lift a to-be-lifted piece, the to-be-lifted piece is fixed with a lifting part, and the lifting tool comprises: a connecting piece, one end of the connecting piece is formed with a positioning hole, the positioning hole is used for accommodating the lifting part when the to-be-lifted piece is connected; a lifting piece connected to the other end of the connecting piece away from the positioning hole, the lifting piece is used for being connected with the lifting device; a clamping assembly arranged in the connecting piece and coaxially arranged with the positioning hole, the clamping assembly is arranged to be switched between a clamping state and an open state, and the clamping assembly is used for clamping the lifting part in the clamping state; the to-be-lifted piece is a fixed knife in a shearing device of a sheared spent fuel assembly; the connecting piece is provided with a mounting hole at the end away from the positioning hole, and the mounting hole is coaxial with the positioning hole; the clamping assembly comprises: a transmission piece; at least two clamping pieces symmetrically arranged on both sides of the transmission piece and matched with the transmission piece; the transmission piece comprises: a main body section; a limiting section connected to the end of the main body section away from the lifting piece, the limiting section is arranged to abut against the lifting part when the clamping assembly is in the clamping state, so as to limit the movement of the transmission piece towards the lifting part; the lifting piece comprises: a first reinforcing piece and a second reinforcing piece respectively arranged at two ends of the lifting piece and connected with the connecting piece; the lifting tool further comprises: an operating piece connected with the transmission piece, the operating piece is used for being clamped and operated by an external operating device to drive the transmission piece to move along the axial direction of the mounting hole; the transmission piece extends out of the mounting hole and is located between the first reinforcing piece and the second reinforcing piece; one end of the operating piece is rotatably connected with the first reinforcing piece, the other end close to the second reinforcing piece is provided with an operating part, and the operating piece is rotatably connected with the transmission piece; the second reinforcing piece is provided with a positioning groove; the operating piece is provided with a positioning part at a position corresponding to the positioning groove; the positioning groove comprises a first positioning groove and a second positioning groove, the first positioning groove and the second positioning groove are distributed along a direction parallel to the axial direction of the mounting hole, and the first positioning groove is located on the side of the second positioning groove away from the connecting piece; the transmission piece is provided with a connecting hole at a position corresponding to the operating piece, the connecting hole extends along a direction perpendicular to the axial direction of the mounting hole; a rotating shaft is connected to the operating piece, and the rotating shaft is arranged in the connecting hole; the operating piece comprises: two rotating arms arranged symmetrically, the transmission piece and the lifting piece are connected between the two rotating arms, and the rotating arms are rotatable relative to the transmission piece and the lifting piece; the operating part is connected with the two rotating arms respectively.

2. The lifting tool according to claim 1, wherein: a receiving cavity is arranged between the mounting hole and the positioning hole, the mounting hole and the positioning hole are communicated through the receiving cavity, and the mounting hole and the receiving cavity are used for mounting the clamping assembly.

3. The lifting tool according to claim 2, wherein: The transmission member is arranged in the mounting hole and extends into the accommodating cavity, and is arranged to be movable in the axial direction of the mounting hole; At least two clamping members are rotatably connected in the accommodating cavity, and the transmission member is arranged to rotate the clamping members when moving to switch between the clamping state and the open state.

4. The spreader of claim 3, wherein The clamping member is provided with a bearing portion at one end close to the lifting portion, the bearing portion is matched with the lifting portion, and the clamping member is arranged to bear the lifting portion when in the clamping state.

5. The spreader of claim 4, wherein A transmission portion is arranged between the main body segment and the limiting segment; The clamping member is provided with a first protruding portion at one end away from the lifting portion, and the transmission portion is arranged to rotate the clamping member when moving relative to the first protruding portion.

6. The lifting device according to claim 5, wherein The clamping member is provided with a connecting shaft, both ends of the connecting shaft are connected to the connecting member, and the connecting shaft is located between the first protruding portion and the bearing portion; The transmission portion includes a second protruding portion arranged between the main body segment and the limiting segment, the size of the second protruding portion is consistent with the distance between the first protruding portions when the clamping member is in the clamping state; and The clamping assembly is arranged such that when the transmission member moves to the second protruding portion abutting between the first protruding portions, the clamping member remains in the clamping state.

7. The spreader of claim 6, wherein The size of the limiting segment is smaller than the distance between the first protruding portions when the clamping member is in the open state; The clamping assembly is arranged such that when the transmission member moves to the limiting segment located between the first protruding portions, the clamping member remains in the open state by its own gravity.

8. The lifting device according to claim 7, wherein The transmission portion further includes a tapered portion connected between the second protruding portion and the limiting segment; The clamping assembly is arranged such that when the tapered portion moves relative to the first protruding portions, the clamping member is rotated.

9. The lifting device according to claim 1, wherein The operating member is arranged such that when the operating member is operated to rotate relative to the first reinforcing member, the operating member moves the transmission member in the axial direction of the mounting hole.

10. The lifting device according to claim 9, wherein The operating member is arranged such that when the operating member is operated to rotate to the positioning portion located in the positioning groove, the clamping assembly is in the clamping state or the open state.

11. The spreader of claim 10, wherein, The operating member is arranged such that: When the operating member is operated to rotate to the positioning portion located in the first positioning groove, the clamping assembly is in the open state; When the operating member is operated to rotate to the positioning portion located in the second positioning groove, the clamping assembly is in the clamping state.

12. The spreader of claim 9, wherein, When the operating member is rotated, the rotating shaft rotates in the connecting hole and moves in a direction perpendicular to the axial direction of the mounting hole.

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