Lifting appliance

Abstract

The utility model provides a lifting appliance, and relates to the technical field of lifting equipment. The lifting appliance comprises a lifting appliance body; the sling assembly comprises a second sling and at least one first sling, the first sling is detachably connected with the second sling, one end of the second sling is connected with the sling body through the first sling, and the other end of the second sling is connected with the sling body or the other end of the second sling is connected with the sling body through the first sling; the second lifting belt is used for lifting a to-be-lifted piece; and the cutting assembly is used for cutting the first lifting belt, so that the second lifting belt releases the to-be-lifted part. The first lifting belt is cut off through the cutting assembly, the second lifting belt loses tension after being cut off, and the second lifting belt slides off from the to-be-lifted piece due to the dead weight, so that the to-be-lifted piece is released by the second lifting belt. In addition, due to the fact that the first sling body and the second sling body are detachably connected, after cutting, the first sling body is convenient to replace, the second sling body is convenient to reuse, and the maintenance cost of the sling is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hoisting equipment, and in particular to a lifting appliance. BACKGROUND

[0002] The blade of a wind turbine is an indispensable key component of a wind power generation device, and wind power generation is achieved through rotation of the blade. During blade installation, a lifting appliance winds a sling around the blade and hoists the blade to a high installation position of a hub at the top of a wind turbine tower, and after the blade reaches the installation position of the hub, the sling needs to be detached from the blade by using an unhooking device of the lifting appliance.

[0003] In the prior art, the unhooking device comprises a housing, a horizontal pin shaft and an electric cylinder, the housing has two opposite hoisting side walls, the horizontal pin shaft is inserted through the two opposite hoisting side walls, the horizontal pin shaft is connected to the electric cylinder, the sling has an ear, and the ear is used to connect to the end of the horizontal pin shaft. When unhooking, the horizontal pin shaft moves horizontally along the axis direction under the pushing of the electric cylinder, so that the pin shaft retracts, and the end of the pin shaft exits from the ear to achieve unhooking.

[0004] However, in some cases, the sling ear is easily tilted and clamped on the unhooking device, so that the sling cannot be detached from the blade. CONTENT OF THE UTILITY MODEL

[0005] The present application provides a lifting appliance to solve the problem that in some cases, the sling ear is easily tilted and clamped on the unhooking device, so that the sling cannot be detached from the blade.

[0006] In order to achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0007] The present application provides a lifting appliance, comprising: a lifting appliance body; a sling assembly, the sling assembly comprising a second sling and at least one first sling, the first sling being detachably connected to the second sling, one end of the second sling being connected to the lifting appliance body through the first sling, the other end of the second sling being connected to the lifting appliance body or the other end of the second sling being connected to the lifting appliance body through the first sling, the second sling being used for hoisting a to-be-hoisted piece; and a cutting assembly, the cutting assembly being used for cutting the first sling to release the to-be-hoisted piece by the second sling.

[0008] In a possible implementation manner, the lifting appliance in the present application embodiment, the cutting assembly is at least one of a laser cutting machine, a flame cutting machine or a mechanical cutting machine.

[0009] In a possible implementation manner, the lifting appliance in the present application embodiment, the cutting assembly is arranged on the lifting appliance body.

[0010] In a possible implementation, the lifting appliance in the embodiment of the present application, the first connecting part is arranged on the second sling, the second connecting part is arranged on the first sling, and the first connecting part is detachably connected with the second connecting part.

[0011] In a possible implementation, the lifting appliance in the embodiment of the present application, the first connecting part is a first connecting ring, the second connecting part is a second connecting ring, and the first connecting ring is connected with the second connecting ring through a fixing shaft.

[0012] In a possible implementation, the lifting appliance in the embodiment of the present application, the first connecting part comprises a connecting shaft and a first connecting end, the second connecting part comprises a second connecting end, the first connecting end and the second connecting end are arranged on the connecting shaft, and the second connecting end is rotationally connected with the connecting shaft.

[0013] In a possible implementation, the lifting appliance in the embodiment of the present application, the number of the first connecting end and the second connecting end is at least two, each first connecting end and each second connecting end are arranged in an alternating manner along the axial direction of the connecting shaft, the first connecting end is provided with a first connecting hole, the second connecting end is provided with a second connecting hole, and the connecting shaft passes through the first connecting hole and the second connecting hole to be connected with the first connecting end and the second connecting end.

[0014] In a possible implementation, the lifting appliance in the embodiment of the present application, the lifting appliance body comprises a lifting arm part, one end of the second sling is connected with one end of the lifting arm part through the first sling, the other end of the second sling is connected with the other end of the lifting arm part or the other end of the second sling is connected with the other end of the lifting appliance body through the first sling.

[0015] In a possible implementation, the lifting appliance in the embodiment of the present application, the lifting appliance body further comprises a telescopic main beam, the number of the lifting arm parts is at least two, and two lifting arm parts are respectively arranged at two ends of the telescopic main beam.

[0016] In a possible implementation, the lifting appliance in the embodiment of the present application, the lifting appliance body further comprises a pressing arm assembly, the pressing arm assembly is arranged on the lifting arm part, and the pressing arm assembly is used for pressing the to-be-lifted part to press the to-be-lifted part and the second sling.

[0017] The lifting appliance provided in the application comprises a lifting appliance body, a lifting belt assembly, and a cutting assembly. The lifting belt assembly comprises a second lifting belt and at least one first lifting belt. The first lifting belt is detachably connected with the second lifting belt. One end of the second lifting belt is connected with the lifting appliance body through the first lifting belt. The other end of the second lifting belt is connected with the lifting appliance body or the other end of the second lifting belt is connected with the lifting appliance body through the first lifting belt. The second lifting belt is used for hoisting a hoisted piece. The cutting assembly is used for cutting the first lifting belt. The first lifting belt is cut off by the cutting assembly. The first lifting belt is separated from the second lifting belt at the cutting point. After the first lifting belt is cut off, the second lifting belt loses the pulling force of the first lifting belt on the second lifting belt. The second lifting belt slips off the surface of the hoisted piece due to the self weight of the second lifting belt, so as to release the hoisted piece by the second lifting belt. In addition, after the cutting assembly cuts off the first lifting belt, the first lifting belt is detachably connected with the second lifting belt, so that the first lifting belt is convenient to replace, the second lifting belt is reused, and the maintenance cost of the lifting belt is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application.

[0019] Figure 1 A structural schematic diagram of the lifting appliance provided in the embodiment of the application;

[0020] Figure 2 A partial enlarged view of part A in FIG. 1; Figure 1

[0021] Figure 3 A front view of the lifting appliance in FIG. 1; Figure 1

[0022] Figure 4 A top view of the lifting appliance in FIG. 1; Figure 1

[0023] Figure 5 A structural schematic diagram of the first connecting part and the second connecting part in the lifting appliance provided in the embodiment of the application Figure 1 ;

[0024] Figure 6 An exploded schematic diagram of the first connecting part and the second connecting part in the lifting appliance provided in the embodiment of the application.

[0025] BRIEF DESCRIPTION OF DRAWINGS

[0026] 100-lifting appliance body;

[0027] 110-telescopic main beam;

[0028] 120-lifting arm piece;

[0029] 130-pressing arm assembly;

[0030] ​​​200-hanging strap assembly;

[0031] 210-first hanging strap;

[0032] 211-second connecting part; 212-second connecting end;

[0033] 220-second hanging strap;

[0034] 221-first connecting part; 222-connecting shaft; 223-first connecting end; 224-locking member;

[0035] 300-cutting assembly.

[0036] The specific embodiments of the application have been shown and described in the above description, and will be more fully appreciated through the following detailed description. The drawings and detailed description are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0037] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, the same numbers are used to indicate the same or similar components. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.

[0038] It should be noted that in the description of the embodiments of the present application, the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship terms based on the orientation or positional relationship shown in the drawings, and are merely for the convenience of description, and do not indicate or imply that the device or component must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0039] In addition, it should be noted that the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated, so that the features with "first", "second" can explicitly or implicitly include one or more of the features, and in the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0040] In this application, unless specifically defined otherwise or the context clearly dictates otherwise, the terms "mounting", "connecting", "fixing" and like terms should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, or electrical connection or can communicate with each other; can be direct connection, or indirect connection through intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0041] The blade of a wind turbine is an indispensable key component of a wind power generation device, and wind power generation is achieved by rotating the blade. During the blade installation process, the lifting tool winds the lifting belt around the blade and hoists the blade to a high installation position on the hub at the top of the wind turbine tower. After the blade reaches the hub installation position, the lifting belt needs to be separated from the blade by using the unhooking device of the lifting tool.

[0042] In the prior art, the unhooking device includes a shell, a horizontal pin shaft and a driving member (such as an electric cylinder). The shell has two opposite lifting side walls, the horizontal pin shaft is inserted through the two opposite lifting side walls, the horizontal pin shaft is connected with the driving member, the lifting belt has a lifting lug, the lifting lug is used to connect with the horizontal pin shaft, and the driving member drives the horizontal pin shaft to move along the axial direction of the horizontal pin shaft to connect or separate from the lifting lug.

[0043] However, in some cases, the lifting belt is easily inclined and clamped on the unhooking device, which causes the lifting belt to be unable to separate from the blade. For example, the material of the lifting belt is synthetic fiber, and the lifting lug is arranged at the end of the lifting belt. In actual working conditions, due to the swing of the blade caused by high-altitude wind load, the lifting belt is easily subjected to asymmetric force. When the lifting lug forms an inclination angle with the axis of the pin shaft, the fiber material of the lifting belt will be plastically deformed under the action of the load, causing the lifting belt ring to form a wedge-shaped friction surface with the surface of the pin shaft. At this time, even if the electric cylinder drives the pin shaft to retreat, the deformed and clamped lifting lug will still move axially with the pin shaft to generate greater radial compression force, eventually forming a "tighter and tighter" mechanical self-locking phenomenon at the end of the pin shaft, resulting in unhooking failure.

[0044] Therefore, the present application provides a lifting appliance, comprising: a lifting appliance body; a sling assembly, the sling assembly comprising a second sling and at least one first sling, the first sling being detachably connected with the second sling, one end of the second sling being connected with the lifting appliance body through the first sling, the other end of the second sling being connected with the lifting appliance body or the other end of the second sling being connected with the lifting appliance body through the first sling, the second sling being used for hoisting a to-be-hoisted piece; and a cutting assembly, the cutting assembly being used for cutting the first sling so as to release the to-be-hoisted piece by the second sling. The first sling is cut off by the cutting assembly, part of the first sling is separated from the second sling at the breakpoint, the first sling loses the pulling force on the second sling after being cut off, and the second sling slides off the to-be-hoisted piece due to the weight, so as to release the to-be-hoisted piece by the second sling. In addition, after the cutting assembly cuts off the first sling, the first sling is detachably connected with the second sling, so that the first sling is convenient to replace, the second sling is reused, and the maintenance cost of the sling is reduced.

[0045] The present application will be described in detail below in combination with specific embodiments. Figures 1 to 6

[0046] The present application provides a lifting appliance, comprising: a lifting appliance body 100; a sling assembly 200, the sling assembly 200 comprising a second sling 220 and at least one first sling 210, the first sling 210 being detachably connected with the second sling 220, one end of the second sling 220 being connected with the lifting appliance body 100 through the first sling 210, the other end of the second sling 220 being connected with the lifting appliance body 100 or the other end of the second sling 220 being connected with the lifting appliance body 100 through the first sling 210, the second sling 220 being used for hoisting a to-be-hoisted piece; and a cutting assembly 300, the cutting assembly 300 being used for cutting the first sling 210 so as to release the to-be-hoisted piece by the second sling 220.

[0047] For example, the to-be-hoisted piece is a blade of a large wind power equipment, the blade is usually installed on a hub located at the top of a tower, and the hub is connected with a transmission system in a nacelle through a main shaft. The blade is fixed on the front end of the hub through bolts and faces the wind direction, forming a wind wheel structure. The hub is connected with the nacelle at the top of the tower, and the wind energy captured by the blade is transmitted to a generator through the main shaft.

[0048] The lifting appliance body 100 is used for driving the sling assembly 200 to move, and the sling assembly 200 is connected with the blade, so as to move the blade to the hub at the top of the tower.

[0049] The first sling 210 is arranged at one end of the second sling 220, one end of the second sling 220 is connected with the lifting appliance body 100 through the first sling 210, and the other end of the second sling 220 is connected with the lifting appliance body 100. Of course, the first sling 210 is arranged at both ends of the second sling 220, and both ends of the second sling 220 are connected with the lifting appliance body 100 through the first sling 210.​

[0050] The spreader body 100 comprises a telescopic main beam 110, a spreader arm 120 and a pressing arm assembly 130. The spreader arm 120 is symmetrically arranged at both ends of the telescopic main beam 110, and the pressing arm assembly 130 is installed at the middle part of the spreader arm 120 and used for pressing the to-be-lifted part.

[0051] It can be understood that when the cutting assembly 300 cuts off the first sling 210, the tension originally transmitted to the second sling 220 by the first sling 210 is released, and the second sling 220 is only subjected to the action of gravity. After cutting, the connection point of the second sling 220 to the to-be-lifted part changes from rigid limiting to free end. Since there is no lateral restraint force, the vertical component force of the weight of the sling is sufficient to overcome the residual friction force to slip off. The first sling 210 and the second sling 220 are detachably connected, and after the cutting assembly 300 cuts off the first sling 210, the undamaged second sling 220 is conveniently reconnected with the new first sling 210.

[0052] In the embodiment of the present application, the spreader cuts off the first sling 210 through the cutting assembly 300, the first sling 210 is separated from the second sling 220 at the breakpoint, and after cutting, the first sling 210 loses the pulling force on the second sling 220. Since there is no lateral restraint force, the second sling 220 slips off the surface of the to-be-lifted part due to its own weight, so as to release the to-be-lifted part. In addition, after the cutting assembly 300 cuts off the first sling 210, since the first sling 210 and the second sling 220 are detachably connected, it is convenient to replace the first sling 210 and reuse the second sling 220, thereby reducing the maintenance cost of the sling.

[0053] In a possible implementation, the spreader in the embodiment of the present application, the cutting assembly 300 is at least one of a laser cutting machine, a flame cutting machine or a mechanical cutting machine. The length of the second sling 220 is greater than the length of the first sling 210, or the length of the second sling 220 is greater than the sum of the lengths of the plurality of first slings 210.

[0054] It should be noted that the spreader body 100 is also provided with an electric hoist, and the electric hoist is connected with the sling assembly 200. The movement of the sling assembly 200 in the direction of gravity is realized through the electric hoist, so as to better connect the sling assembly 200 with the blade.

[0055] The cutting assembly 300 is installed at the connection between the electric hoist and the sling assembly 200, and the sling assembly 200 is located on the cutting path of the cutting assembly 300.

[0056] For example, the sling assembly 200 comprises the first sling 210 and the second sling 220, the first sling 210 is arranged at the end of the second sling 220, and the first sling 210 is located on the cutting path of the cutting assembly 300.

[0057] When the cutting assembly 300 is a laser cutting machine, the first sling 210 is located on the laser path, and the laser cutting machine emits laser to break the first sling 210. Under the action of gravity, the first sling 210 and the second sling 220 move away from the blade, so that the sling assembly 200 is separated from the blade, facilitating the removal and recovery of the blade sling.

[0058] The cutting assembly 300 can be a mechanical cutting machine, which includes a cutting tool, a driving device and a transmission device. When it is necessary to separate the sling assembly 200 from the blade, the driving device of the mechanical cutting machine is started, and the motor drives the cutting tool to rotate through the transmission device. The cutting tool moves to the first sling 210 along the cutting path, and cuts the first sling 210 in the process of high-speed rotation. With the cutting, the first sling 210 is cut off, and the first sling 210 and the second sling 220 are separated from the blade under the action of gravity. Since the first sling 210 and the second sling 220 are detachably connected and the length of the first sling 210 is relatively short, the second sling 220 can be reused, reducing the loss of the sling.

[0059] The cutting assembly 300 can be a flame cutting machine, which generates high-temperature flame to rapidly heat the first sling 210 to its melting point and cut it off. The first sling 210 and the second sling 220 move away from the blade under the action of gravity, realizing the separation of the sling assembly 200 from the blade.

[0060] It should be noted that the cutting assembly 300 can only include a laser cutting machine, and of course can include a laser cutting machine and a mechanical cutting machine. For example, when the two ends of the second sling 220 are connected to the sling assembly 100 through the first sling 210 respectively, a laser cutting machine can be remotely arranged away from the first sling 210, and a mechanical cutting machine is arranged at the end of the first sling 210, so as to realize double cutting guarantee. When the laser cutting machine and the mechanical cutting machine cut at the same time, the cutting efficiency can be improved, and the sling assembly 200 and the blade can be quickly separated. When the laser cutting machine fails, the other mechanical cutting machine can still operate to separate the blade and the sling assembly 200.

[0061] It should be noted that the cutting assembly 300 preferably uses a laser cutting machine, which can avoid the risk of mechanical jamming due to non-contact cutting, and is especially suitable for efficient cutting of fiber slings; the flame cutting machine is suitable for metal slings, and the mechanical cutting machine serves as a backup.

[0062] In a possible implementation, the lifting appliance in the embodiment of the present application is provided with the cutting assembly 300 arranged on the lifting appliance body 100.

[0063] Specifically, the cutting assembly 300 is arranged at the end of the first sling 210 away from the second sling 220, so as to shorten the cutting path of the cutting assembly 300 to the first sling 210 and improve the cutting efficiency.

[0064] For example, the cutting assembly 300 is fixed on the end of the lifting arm 120 of the lifting appliance body 100 by bolts and is located on one side of the first sling 210. Alternatively, the cutting assembly 300 is fixed on the end of the lifting arm 120 and is located above the connection point of the first sling 210 and the lifting appliance body 100, so as to ensure that the cutting path is perpendicular to the stress direction of the first sling 210.

[0065] In a possible implementation, the lifting appliance in the embodiment of the present application is provided with the first connecting part 221 arranged on the second sling 220 and the second connecting part 211 arranged on the first sling 210, and the first connecting part 221 and the second connecting part 211 are detachably connected.

[0066] The first sling 210 of the sling assembly 200 is provided with the first connecting part 221 at both ends, and the first connecting part 221 can be a hook. The second sling 220 is provided with the second connecting part 211 at both ends, and the second connecting part 211 can be a connecting ring. The hook passes through the connecting ring, so that the first sling 210 and the second sling 220 are connected.

[0067] In a possible implementation, the lifting appliance in the embodiment of the present application is provided with the first connecting ring as the first connecting part and the second connecting ring as the second connecting part, and the first connecting ring and the second connecting ring are connected through a fixing shaft. Specifically, the first connecting ring and the second connecting ring are both in the shape of a semicircular arc. The first connecting ring and the second connecting ring are both provided with a hole at both ends, and the fixing shaft passes through the holes of the first connecting ring and the second connecting ring and is connected with the first connecting ring and the second connecting ring. The first connecting ring and the second connecting ring can both rotate around the axis of the fixing shaft, so as to realize multi-degree-of-freedom rotation and adapt to different working conditions, such as the state of the blade in the air, so as to reduce the dynamic load impact caused by wind disturbance.

[0068] The first connecting part 221 is a connecting ring, and the second connecting part 211 is a connecting rope. The connecting rope is arranged around the connecting ring. The second connecting part 211 can also be a hook.

[0069] In a possible implementation, the lifting appliance in the embodiment of the present application is provided with the first connecting part 221 including the connecting shaft 222 and the first connecting end 223, and the second connecting part 211 including the second connecting end 212. The first connecting end 223 and the second connecting end 212 are both arranged on the connecting shaft 222, and the second connecting end 212 is rotationally connected with the connecting shaft 222.

[0070] It can be understood that the application integrates multiple connection ends through the connecting shaft 222, supports flexible expansion of the number of connection ends, and adapts to different working condition requirements.

[0071] The number of the first connection ends 223 and the second connection ends 212 is at least two, the first connection ends 223 and the second connection ends 212 are arranged in an alternating manner along the axis direction of the connecting shaft 222, the first connection ends 223 are provided with first connection holes, the second connection ends 212 are provided with second connection holes, and the connecting shaft 222 passes through the first connection holes and the second connection holes to be connected with the first connection ends 223 and the second connection ends 212. The first connection ends 223 and the second connection ends 212 are arranged in an alternating manner along the axis of the connecting shaft 222, forming a multi-node load distribution to avoid single-point stress concentration, and allowing the second connection ends 212 to rotate around the shaft to adapt to the inclination of the sling.

[0072] It should be noted that the number of the connecting shaft 222 is not limited, and the number of the connecting shaft 222 can be one or two.

[0073] For example, the number of the connecting shaft 222 is one, and the number of the locking member 224 is two. The locking member 224 is used to lock and fix the connecting shaft 222 and the first connection end 223.

[0074] Specifically, the first connecting part 221 includes the connecting shaft 222 and at least two first connection ends 223, and each first connection end 223 is arranged in an interval along the axis direction of the connecting shaft 222. Each first connection end 223 is provided with a first connection hole. The second connecting part 211 includes at least two second connection ends 212, and each second connection end 212 is arranged in an interval along the axis direction of the connecting shaft 222. Each second connection end 212 is provided with a second connection hole, and the second connection end 212 is rotationally connected with the connecting shaft 222 through the second connection hole.

[0075] The first connection ends 223 and the second connection ends 212 are arranged in an alternating manner along the axis direction of the connecting shaft 222, that is, one second connection end 212 is arranged between two adjacent first connection ends 223 (for example, the second connection end 212 is located between the two first connection ends 223). The connecting shaft 222 sequentially passes through each first connection hole and second connection hole to assemble the first connecting part 221 and the second connecting part 211 into one body. The number of the locking member 224 (such as a nut or a pin) is two, which is arranged at both ends of the connecting shaft 222, passes through the end of the connecting shaft 222 and abuts against the first connection end 223 to fix the axial position of the connecting shaft 222 and the first connection end 223, preventing relative sliding. The embodiment of the application realizes the compact layout of multiple connection ends through a single connecting shaft 222, simplifies the structure and facilitates assembly, and the locking member 224 ensures the stability of the connection.

[0076] The number of connecting shafts 222 is two, the number of locking members 224 is four, and the number of first connecting ends 223 and second connecting ends 212 is four. The two connecting shafts 222 are arranged in parallel and are spaced apart along the axis of the connecting shaft 222. Two first connecting ends 223 and two second connecting ends correspond to one connecting shaft 222, and the other two first connecting ends 223 and the other two second connecting ends correspond to the other connecting shaft 222. Two locking members 224 correspond to one connecting shaft 222, and the other two locking members 224 correspond to the other connecting shaft 222.

[0077] Two first connecting ends 223 and two second connecting ends 212 are alternately arranged on each connecting shaft 222, i.e. arranged in the order of first connecting end 223, second connecting end 212, first connecting end 223, and second connecting end 212 along the axis direction. Each first connecting end 223 and second connecting end 212 is sleeved on the corresponding connecting shaft 222 through the first connecting hole and the second connecting hole, and the second connecting end 212 is rotationally connected with the connecting shaft 222. The number of locking members 224 is four, and two locking members 224 are arranged at the two ends of each connecting shaft 222, which are used to fix the axial position of the connecting shaft 222 and the corresponding first connecting end 223. This double connecting shaft 222 structure can provide higher connection strength and stability, and is especially suitable for hoisting operations of heavy and large-sized hoisting parts such as large wind turbine blades. In actual operation, the double connecting shaft structure can better disperse stress, reduce the load of a single connecting shaft 222, and improve the reliability and safety of the entire hoist connecting structure.

[0078] In addition, the locking member 224 cooperates with the end of the connecting shaft 222 to prevent axial displacement, while allowing the second connecting end 212 to rotate around the shaft to achieve movable connection.

[0079] In a possible implementation, the hoist in the embodiment of the present application, the hoist body 100 includes a hoist arm member 120, one end of the second hoisting belt 220 is connected to one end of the hoist arm member 120 through the first hoisting belt 210, the other end of the second hoisting belt 220 is connected to the other end of the hoist arm member 120 or the other end of the second hoisting belt 220 is connected to the other end of the hoist body 100 through the first hoisting belt 210.

[0080] The telescopic main beam 110 is used to carry the hoist arm member 120. It should be noted that the cutting assembly 300 can be arranged on the side of the hoist body 100 facing the first hoisting belt 210, and the cutting assembly 300 is connected to the first hoisting belt 210 to cut the first hoisting belt 210. The hoist arm member 120 is used to carry the hoisting belt assembly 200.

[0081] The cutting assembly 300 can also be arranged above the lifting appliance body 100, away from the first sling 210, as long as the first sling 210 is located on the cutting path of the cutting assembly 300.

[0082] In a possible implementation, the lifting appliance in the embodiment of the present application further comprises a telescopic main beam 110, and the number of the lifting arm members 120 is at least two, and the two lifting arm members 120 are respectively arranged at two ends 110 of the telescopic main beam 110.

[0083] The telescopic main beam 110 can be driven to expand by hydraulic pressure, and the lifting arm members 120 are synchronously adjusted in span with the telescopic main beam 110 to adapt to the hoisting requirements of blades of different sizes.

[0084] Specifically, the lifting arm members 120 are connected with the telescopic main beam 110 through a pin shaft. The structure of the telescopic main beam 110 is not limited in the present application. For example, the telescopic main beam 110 comprises a plurality of telescopic sections, and each section is driven to extend in sequence by a hydraulic cylinder, so that the telescopic main beam 110 is expanded. The number of the lifting arm members 120 is at least two, and each lifting arm member 120 is arranged at an end of the telescopic main beam 110, so that the forces acting on the two ends of the telescopic main beam 110 are balanced when hoisting.

[0085] In a possible implementation, the lifting appliance in the embodiment of the present application further comprises a pressing arm assembly 130, and the pressing arm assembly 130 is arranged on the lifting arm member 120. The pressing arm assembly 130 is used for pressing the to-be-hoisted member, so that the to-be-hoisted member is pressed tightly with the second sling 220.

[0086] It can be understood that the pressing arm assembly 130 is provided with a rotating pressing block, which can be driven by a pneumatic cylinder or a hydraulic cylinder to adjust the pressing force, so as to tightly adhere to the blade without damaging the blade.

[0087] The lifting appliance body 100 comprises the lifting arm members 120, the telescopic main beam 110 and the pressing arm assembly 130. The lifting arm members 120 and the pressing arm assembly 130 are arranged on the telescopic main beam 110. The lifting arm members 120 are located at at least one end of the telescopic main beam 110, for example, the lifting arm members 120 are symmetrically mounted at two ends of the telescopic main beam 110, or are arranged on one side to adapt to different working conditions. The pressing arm assembly 130 is located in the middle of the lifting arm members 120. At least one end of the lifting arm members 120 is connected with the second sling 220, for example, one end of the lifting arm members 120 is connected with the second sling 220, and the other end is connected with the first sling 210.

[0088] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0089] It is to be understood that the application is not limited to the precise construction hereinafter described and as shown in the attached drawings, and that various changes in form and detail can be made therein without departing from the scope thereof. The scope of the application is limited only by the claims which follow.

Claims

1. A spreader, characterized in that, The lifting device comprises: a lifting device body; a sling assembly, the sling assembly comprising a second sling and at least one first sling, the first sling being detachably connected with the second sling, one end of the second sling being connected with the lifting device body through the first sling, the other end of the second sling being connected with the lifting device body or the other end of the second sling being connected with the lifting device body through the first sling, the second sling being used for hoisting a hoisted piece; a cutting assembly, the cutting assembly being used for cutting the first sling so as to release the hoisted piece by the second sling.

2. The spreader of claim 1, characterized in that The cutting assembly is at least one of a laser cutting machine, a flame cutting machine or a mechanical cutting machine.

3. The spreader of claim 2, wherein The cutting assembly is arranged on the lifting device body.

4. The spreader according to any one of claims 1-3, characterized in that A first connecting part is arranged on the second sling, and a second connecting part is arranged on the first sling, the first connecting part being detachably connected with the second connecting part.

5. The spreader of claim 4, wherein The first connecting part is a first connecting ring, and the second connecting part is a second connecting ring, the first connecting ring being connected with the second connecting ring through a fixing shaft.

6. The spreader of claim 4, wherein The first connecting part comprises a connecting shaft and a first connecting end, and the second connecting part comprises a second connecting end, the first connecting end and the second connecting end being arranged on the connecting shaft, the second connecting end being rotatably connected with the connecting shaft.

7. The spreader of claim 6, wherein The number of the first connecting end and the second connecting end is at least two, the first connecting ends and the second connecting ends being arranged in an alternating manner along the axial direction of the connecting shaft, a first connecting hole being arranged on the first connecting end, and a second connecting hole being arranged on the second connecting end, the connecting shaft penetrating through the first connecting hole and the second connecting hole to be connected with the first connecting end and the second connecting end.

8. The spreader according to any one of claims 1-3, characterized in that The lifting device body comprises a lifting arm piece, one end of the second sling being connected with one end of the lifting arm piece through the first sling, and the other end of the second sling being connected with the other end of the lifting arm piece or the other end of the second sling being connected with the other end of the lifting device body through the first sling.

9. The spreader of claim 8, wherein The lifting device body further comprises a telescopic main beam, and the number of the lifting arm pieces is at least two, the two lifting arm pieces being arranged at two ends of the telescopic main beam respectively.

10. The spreader of claim 8, wherein The lifting device body further comprises a pressing arm assembly, the pressing arm assembly being arranged on the lifting arm piece, the pressing arm assembly being used for pressing the hoisted piece to press the hoisted piece and the second sling tightly.

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