Lifting appliance

Abstract

A second lifting rod and a third lifting rod are connected to the bottom end of a first lifting rod, the top end of the third lifting rod is hinged to the bottom end of the first lifting rod, and a first bearing piece arranged at the bottom end of the second lifting rod and a second bearing piece arranged at the bottom end of a fourth lifting rod are oppositely arranged and used for clamping and bearing an object to be lifted. A fourth lifting rod is arranged between the third lifting rod and the first lifting rod, the bottom of the fourth lifting rod is connected with the top end of the third lifting rod through a telescopic part, and the total length of the fourth lifting rod and the third lifting rod is automatically controlled through stretching of the telescopic part; the total length of the fourth lifting rod and the third lifting rod can be automatically controlled, objects with different depth clearances can be lifted, in a transverse space, only the bottom space size needs to be met, long objects or large objects or heavy objects can be taken out rapidly in a narrow space in a lossless mode, and the construction efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of hoisting objects, in particular to a lifting appliance. BACKGROUND

[0002] The lifting appliance refers to the device for lifting heavy objects in hoisting machinery, and the most commonly used lifting appliance for lifting component objects is a lifting hook, a lifting belt, and other lifting rings, lifting suction cups, tongs and forks, which are widely used in the hoisting industry.

[0003] At present, there are two types of lifting appliances on the market, one is a lifting appliance for moving suspended objects, and the other is a lifting appliance for moving objects supported at the bottom.

[0004] The lifting appliance for moving suspended objects usually moves by overcoming gravity through a lifting hole or binding the object, but when the object is too thin to set up a lifting hole, the outer surface of the object is smooth, or the net height for lifting is limited, there is a problem that the object cannot be suspended for movement, or there is a risk of falling during movement.

[0005] And the lifting appliance for moving objects supported at the bottom moves by overcoming the gravity of the object by supporting from the side of the object to the bottom of the object, and the bottom support structure of the lifting appliance for hoisting objects needs to have sufficient rigidity to stabilize the hoisted object, so the support structure of the lifting appliance has a certain thickness. When the object is large, the opening range of the lifting appliance increases, and the inclination angle of the support structure also increases, and the lifting height of the object also increases when the lifting appliance is folded, and when the net height of the space where the object is located is limited, the lifting appliance cannot enter the bottom of the object, and when the object is far away from the hook, considering the actual application situation, the object cannot be smoothly hoisted; the disturbance to the object during retrieval is large, which is not conducive to maintaining the overall structural stability of the object.

[0006] Therefore, a lifting appliance is needed that can quickly and non-destructively retrieve long objects, large objects (object length greater than the span of the narrow space, and limited headroom above the object) or heavy objects in a narrow space. UTILITY MODEL CONTENT

[0007] The utility model aims to provide a lifting appliance that can quickly and non-destructively retrieve long objects, large objects or heavy objects in a narrow space.

[0008] To solve the above technical problems, the utility model discloses a kind of hangers, including first derrick, second derrick, third derrick and fourth derrick, the bottom end of the first derrick is connected with the top end of the second derrick, the top end of the third derrick, the top end of the third derrick is hinged with the bottom end of the first derrick, the bottom end of the second derrick is provided with first support piece, the bottom end of the fourth derrick is provided with second support piece, the end of the first support piece and the second support piece is disposed towards, for clamping and carrying the object to be hoisted, the top end of the fourth derrick is hinged with the bottom end of the first derrick, the bottom of the fourth derrick is connected with the top end of the third derrick by telescopic piece, and the total length of the fourth derrick, the third derrick is automatically controlled by the telescopic telescopic piece, the included angle of the first support piece and the second derrick is acute angle, the included angle of the second support piece and the third derrick is acute angle.

[0009] Wherein, still including the included angle control piece for controlling the included angle between the second derrick, the third derrick between the second derrick, the third derrick, the included angle control piece is spring or telescopic cylinder.

[0010] Wherein, still including support piece, the first end of the support piece is hinged with one of the first support piece or the second support piece, and the second end is located on the upper surface of the unconnected end of the first support piece or the second support piece.

[0011] Wherein, still including support groove in the first support piece, the second support piece, for accommodating the support piece, the support piece is used to separate the first support piece, the second support piece under static, so that the opening between the first support piece, the second support piece is greater than the transverse dimension of the object to be hoisted, the second derrick is welded with the first support piece, the fourth derrick is welded with the second support piece, the first support piece, the second support piece is the support piece with wedge-shaped mouth L-shaped structure.

[0012] Wherein, the top end of the second derrick is hinged or fixedly connected with the bottom end of the first derrick, and the second derrick and the third derrick are located on the same side or different sides of the first derrick.

[0013] Wherein, still including installation groove arranged in the bottom end of the first derrick, the top end of the second derrick, the third derrick is installed in the installation groove, and the first derrick is a hollow cuboid structure derrick.

[0014] Wherein, the first derrick and the second derrick, the third derrick are coaxially connected through connecting piece, and the connecting piece is bolt or pin.

[0015] The handle is welded or clamped with the first suspender, the top of the handle is provided with a cylindrical structure, the bottom is provided with a mouth-shaped fixing structure, and the handle is connected with the first suspender through the mouth-shaped fixing structure.

[0016] The hollow channel is arranged at the bottom of the fourth suspender, the telescopic member is arranged in the hollow channel, the telescopic member is fixed in the hollow channel through the baffle, the lower end of the hollow channel is provided with a hollow sealing opening, and the transverse dimension of the hollow sealing opening is smaller than that of the hollow channel.

[0017] The constraint member is sleeved with the outer wall of the first suspender, the third suspender is surrounded in the inner space of the constraint member, the transverse dimension of the constraint member gradually increases from top to bottom, and the constraint member is fixed on the hook of the outer wall of the first suspender through a chain.

[0018] Compared with the prior art, the lifting appliance provided in the embodiment of the utility model has the following advantages:

[0019] The lifting appliance provided in the embodiment of the utility model is characterized in that the second suspender and the third suspender are connected at the bottom end of the first suspender, the top end of the third suspender is hinged to the bottom end of the first suspender, the first supporting member arranged at the bottom end of the second suspender is arranged opposite to the second supporting member arranged at the bottom end of the fourth suspender, the second suspender and the fourth suspender are used for clamping and bearing the object to be hoisted, the fourth suspender is arranged between the first suspender and the third suspender, the bottom of the fourth suspender is connected to the top end of the third suspender through the telescopic member, and the total length of the fourth suspender and the third suspender is automatically controlled through the telescoping of the telescopic member, so that when the object to be hoisted has no hoisting hole, the total length of the fourth suspender and the third suspender can be automatically controlled due to the presence of the telescopic member, the object with different depth clearance can be hoisted, and as long as the bottom space size is met in the transverse space, the long object, the large object or the heavy object can be quickly and nondestructively taken out in the narrow space, the disturbance to the object in the hoisting process is minimized, the overall stability of the object structure is beneficial to maintaining, and the construction efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0021] Figure 1 It is a front structure schematic view of one embodiment of the lifting appliance provided by the utility model;

[0022] Figure 2 The side surface front structure schematic view of one embodiment of the lifting appliance provided by the utility model;

[0023] Figure 3 The clamping front structure schematic view of another embodiment of the lifting appliance provided by the utility model;

[0024] Figure 4 The clamping middle structure schematic view of another embodiment of the lifting appliance provided by the utility model;

[0025] Among them, the first lifting rod - 101, the handle - 102, the connecting piece - 2, the second lifting rod - 301, the first supporting piece - 302, the fourth lifting rod - 401, the third lifting rod - 402, the telescopic piece - 403, the baffle - 404, the second supporting piece - 405, the object to be lifted - 5, the obstacle - 6, the constraint piece - 103, the hook - 104, the cable - 105. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor fall within the protection scope of the utility model.

[0027] Please refer to Figures 1-4 , Figure 1 The front structure schematic view of one embodiment of the lifting appliance provided by the utility model; Figure 2 The side surface front structure schematic view of one embodiment of the lifting appliance provided by the utility model; Figure 3 The clamping front structure schematic view of another embodiment of the lifting appliance provided by the utility model; Figure 4 The clamping middle structure schematic view of another embodiment of the lifting appliance provided by the utility model.

[0028] In a specific embodiment, the lifting tool comprises a first lifting rod 101, a second lifting rod 301, a third lifting rod 402 and a fourth lifting rod 401, the bottom end of the first lifting rod 101 is connected with the top end of the second lifting rod 301 and the top end of the third lifting rod 402, the top end of the third lifting rod 402 is hinged with the bottom end of the first lifting rod 101, the bottom end of the second lifting rod 301 is provided with a first supporting piece 302, the bottom end of the fourth lifting rod 401 is provided with a second supporting piece 405, the distal ends of the first supporting piece 302 and the second supporting piece 405 are oppositely arranged for clamping and carrying the object to be lifted, the top end of the fourth lifting rod 401 is hinged with the bottom end of the first lifting rod 101, the bottom of the fourth lifting rod 401 is connected with the top end of the third lifting rod 402 through a telescopic piece 403, and the total length of the fourth lifting rod 401 and the third lifting rod 402 is automatically controlled through the telescoping of the telescopic piece 403, the angle between the first supporting piece 302 and the second lifting rod 301 is an acute angle, and the angle between the second supporting piece 405 and the third lifting rod 402 is an acute angle.

[0029] By connecting the second lifting rod 301 and the third lifting rod 402 at the bottom end of the first lifting rod 101, hinging the top end of the third lifting rod 402 with the bottom end of the first lifting rod 101, oppositely arranging the first supporting piece 302 provided at the bottom end of the second lifting rod 301 with the second supporting piece 405 provided at the bottom end of the fourth lifting rod 401 for clamping and carrying the object to be lifted, and arranging the fourth lifting rod 401 between the first lifting rod 101 and the third lifting rod 402, the bottom of the fourth lifting rod 401 is connected with the top end of the third lifting rod 402 through a telescopic piece 403, and the total length of the fourth lifting rod 401 and the third lifting rod 402 is automatically controlled through the telescoping of the telescopic piece 403, so that when the object to be lifted has no lifting hole, the total length of the fourth lifting rod 401 and the third lifting rod 402 can be automatically controlled due to the presence of the telescopic piece 403, the object of different depth clearance can be lifted, and as long as the bottom space size is met in the transverse space, the long object, large object or heavy object can be quickly and non-destructively taken out in the narrow space, the disturbance to the object during lifting is minimized, the overall stability of the object structure is maintained, and the construction efficiency is improved.

[0030] In order to further improve the clamping efficiency of the object, the distal ends of the first supporting piece 302 and the second supporting piece 405 are not on the outside, so as to avoid damage caused by scratching during movement.

[0031] In an embodiment, the lifting tool further comprises an angle control piece arranged between the second lifting rod 301 and the third lifting rod 402 for controlling the angle between the second lifting rod 301 and the third lifting rod 402, and the angle control piece is a spring or a telescopic cylinder.

[0032] By setting the included angle control piece between the second boom 301 and the third boom 402, the included angle between the two can be controlled, so that in the static state, a small included angle between the two can be controlled, the rapid positioning of the object can be realized, and after the clamping is completed, the contraction can be automatically performed, so that the reliability of clamping is ensured.

[0033] The structure and installation mode of the included angle control piece are not limited in the application.

[0034] In order to further ensure the support between the first supporting piece 302 and the second supporting piece 405, in an embodiment, the lifting appliance further comprises a supporting piece, a first end of the supporting piece is hinged to one of the first supporting piece 302 or the second supporting piece 405, and a second end of the supporting piece is located on the upper surface of the unconnected end of the first supporting piece 302 or the second supporting piece 405.

[0035] By setting the supporting piece between the first supporting piece 302 and the second supporting piece 405, one end is hinged, the other end is not installed and contacts the unconnected part, and even a torsional spring can be provided, so that the first supporting piece 302 and the second supporting piece 405 cannot be staggered, and the safety of use is improved.

[0036] Furthermore, in order to facilitate the installation of the supporting piece, in an embodiment, the lifting appliance further comprises a supporting groove provided in the first supporting piece 302 and the second supporting piece 405, for accommodating the supporting piece, the supporting piece is used to separate the first supporting piece 302 and the second supporting piece 405 in the static state, so that the opening between the first supporting piece 302 and the second supporting piece 405 is greater than the transverse dimension of the object to be hoisted.

[0037] By setting the supporting groove for accommodating the supporting piece, the installation efficiency is improved, and at the same time, the opening between the first supporting piece 302 and the second supporting piece 405 can be ensured to be greater than the transverse dimension of the object to be hoisted, and the clamping efficiency of the object is improved.

[0038] In the application, the second boom 301 and the third boom 402 are connected with the first boom 101, and the connection mode is not limited, in an embodiment, a top end of the second boom 301 is hinged or fixedly connected with a bottom end of the first boom 101, and the second boom 301 and the third boom 402 are located on the same side or different sides of the first boom 101.

[0039] In the present application, the second boom 301 and the first boom 101 can be fixedly connected, hingedly connected or connected in other manners, and the second boom 301 and the third boom 402 can be located on the same side of the first boom 101 or on the opposite side of the first boom 101 for the purpose of increasing stability, and can be located at the same position or at different positions.

[0040] In the present application, the connection manner and the connection position of the second boom 301 and the first boom 101 are not limited.

[0041] In order to improve the installation efficiency, reduce the exposure of components and improve the service life, in an embodiment, the lifting appliance further comprises a mounting groove arranged at the bottom end of the first boom 101, the top end of the second boom 301 and the third boom 402 is mounted in the mounting groove, and the first boom 101 is a hollow cuboid structure boom.

[0042] By arranging the mounting groove at the bottom end of the first boom 101 and mounting the top end of the second boom 301 and the third boom 402 in the mounting groove, the appearance can be made beautiful, the connection position can be arranged inside the component, the occupation of external space can be reduced, and the activity space can be increased.

[0043] In the present application, the mounting structure includes but is not limited to the above, and the shape, material and size of the first boom 101 are not limited.

[0044] In order to further improve the connection efficiency, in an embodiment, the first boom 101 and the second boom 301 and the third boom 402 are coaxially connected through a connecting piece 2, and the connecting piece 2 is a bolt or a pin.

[0045] By coaxially connecting the first boom 101 and the second boom 301 and the third boom 402 through the connecting piece 2, the number of connection points can be reduced, and the connection efficiency can be improved.

[0046] In the present application, the material, structure and connection manner of the connecting piece 2 are not limited, including but not limited to a bolt and a pin.

[0047] In the present application, the lifting appliance needs to be arranged or manually assisted in order to lift the object. In order to improve the convenience of manual use, in an embodiment, the lifting appliance further comprises a handle 102 arranged at the top end of the first boom 101, the handle 102 is welded or clamped with the first boom 101, the top of the handle 102 is provided with a cylindrical structure, the bottom is provided with a mouth-shaped fixing structure, and the handle 102 is connected with the first boom 101 through the mouth-shaped fixing structure.

[0048] By setting the handle 102 at the top end of the first hoist 101, the user can conveniently hold it, improving the reliability in the user's hand.

[0049] The structure, material and mounting method of the handle 102 are not limited in the application.

[0050] The application adopts a supporting piece to support the object, and the structure and mounting method of the supporting piece are not limited. In one embodiment, the second hoist 301 is welded to the first supporting piece 302, the fourth hoist 401 is welded to the second supporting piece 405, and the first supporting piece 302 and the second supporting piece 405 are supporting pieces with a wedge-shaped L-shaped structure.

[0051] The mounting method of the supporting piece in the application includes but is not limited to the welding method mentioned above, and can also use clamping, bolt connection and other methods.

[0052] In the application, the fourth hoist 401 needs to be connected to the third hoist 402 through the telescopic piece 403, and the connection method is not limited. It can be connected by external structure or internal structure, but there is a possibility of damage due to long-term exposure.

[0053] Therefore, in one embodiment, the hoist further comprises a hollow channel provided at the bottom of the fourth hoist 401, the telescopic piece 403 is arranged in the hollow channel, and the telescopic piece 403 is fixed in the hollow channel by the baffle 404, and the lower end of the hollow channel is provided with a hollow seal, and the transverse dimension of the hollow seal is smaller than that of the hollow channel.

[0054] By providing a hollow channel at the bottom of the fourth hoist 401, the telescopic piece 403 is installed in the hollow channel, and the lower end of the seal is blocked and fixed by the baffle 404, which can ensure that the telescopic piece 403 is fixed in the fourth hoist 401, and the reliability and service life of the telescopic piece 403 are ensured.

[0055] Because there is an angle between the second hoist 301 and the third hoist 402 in actual operation, it is easy to control the angle.

[0056] In order to improve the control efficiency and control reliability, in one embodiment, the hoist further comprises a constraint piece 103 arranged in the outer wall of the first hoist 101, the third hoist 402 is arranged in the inner space of the constraint piece 103, the transverse dimension of the constraint piece 103 gradually increases from top to bottom, and the constraint piece 103 is fixed to the hook 104 of the outer wall of the first hoist 101 by the cable 105.

[0057] By setting the constraint member 103, the maximum included angle between the third boom 402 and the second boom 301 can be controlled, and the subsequent control reliability is ensured.

[0058] In the present application, the material, structure, and shape of the constraint member 103 are not limited, and in addition to the trumpet mouth, other structures can also be used, and in addition to the above-mentioned manner, other structures can also be used, such as setting a boss structure on the outer wall of the first boom 101 to limit, and in addition to the use of the cable chain, other structures can also be used. The present application does not limit the fixing method, material, size, etc. of the cable chain.

[0059] In one embodiment, the lifting tool comprises: a boom, a support member, a displacement assembly, a handle assembly, and a constraint assembly, the boom comprises a first boom 101, a second boom 301, a fourth boom 401, and a third boom 402.

[0060] The first boom 101 is coaxially connected with the second boom 301 and the fourth boom 401 through the connecting member 2, the first boom 101 adopts a hollow cuboid structure to ensure bending stiffness and reduce weight; the second boom 301 and the fourth boom 401 are located below the first boom 101; the first boom 101 is hinged with the fourth boom 401; the first boom 101 is fixedly connected with the second boom 301; the connecting member 2 adopts a fixed pin; the first boom 101 is provided with a groove at the bottom; the first boom 101 bottom groove can at least wrap one of the second boom 301 and the fourth boom 401 to reduce the overall width of the boom system; the second boom 301 and the fourth boom 401 are installed inside the first boom 101.

[0061] The included angle control member is connected with the second boom 301 and the third boom 402 at both ends and can be telescopic; the second boom 301 is preferably hingedly connected; the third boom 402 is hingedly connected (because the third boom 402 has relative up-down displacement in addition to the opening and closing displacement relative to the second boom 301); the support member is installed on the first support member 302, and the support member adopts a hard material; one end is hingedly connected with the first support member 302; the first support member 302 has a recess inside; the second support member 405 has a recess inside; the support member can be placed in the recess inside the first support member 302; the support member can be placed in the recess inside the second support member 405; the support member has a certain length, so that when the support member is located in the recess of the second support member 405, the opening size of the first support member 302 and the second support member 405 is greater than the object 5 to be lifted.

[0062] The first lifting rod 101 top end is provided with a handle 102, and the handle 102 is welded on the top end of the first lifting rod 101; the handle 102 adopts a “mouth” shaped fixing structure; the top of the handle 102 adopts a cylindrical structure; the second lifting rod 301 bottom is connected with a first supporting piece 302, and the first supporting piece 302 is welded with the second lifting rod 301; the first supporting piece 302 adopts a “L” shaped structure with a wedge-shaped mouth; the first supporting piece 302 has a certain length, and when the second lifting rod 301 abuts against the to-be-lifted object 5, the first supporting piece 302 can extend into the bottom of the to-be-lifted object with sufficient length.

[0063] The included angle between the first supporting structure and the second lifting rod 301 is an acute angle.

[0064] The other end of the third lifting rod 402 is connected with a fourth lifting rod 401, and the outer diameters of the third lifting rod 402 and the fourth lifting rod 401 are inconsistent.

[0065] The outer diameters of the third lifting rod 402 and the fourth lifting rod 401 have a large deviation; the diameter of the fourth lifting rod 401 is larger than that of the third lifting rod 402; the fourth lifting rod 401 bottom is provided with a hollow groove; the third lifting rod 402 bottom is provided with a hollow sealing portion; the hollow size of the third lifting rod 402 bottom sealing portion is smaller than the internal groove size of the third lifting rod 402.

[0066] The constraint assembly comprises:

[0067] The constraint piece 103 is sleeved on the lifting rod 101, and the constraint piece 103 is a hollow structure with open upper and lower ends; the constraint piece 103 has sufficient strength and rigidity; the constraint piece 103 adopts a horn-shaped opening (i.e. the top end opening is small, and the bottom end opening is large); the constraint piece 103 is connected with the lifting rod 101 by a cable chain 105; the cable chain 105 adopts an iron chain, and the iron chain is hung on a protruding structure hook 104 on the lifting rod 101; the iron chain can be quickly assembled and disassembled from the hook 104.

[0068] The use method is as follows:

[0069] ①The lifting device is placed directly above the object;

[0070] ②Continue to lower the lifting device to the bottom of the object;

[0071] ③Drag the first lifting rod 101 to one side of the second lifting rod 301 horizontally (under the action of the gravity of the object, the third lifting rod 402 will be stretched, under the action of the counterforce of the telescopic piece 403, the second supporting piece 405 will be subjected to the oblique upward tension force transmitted by the third lifting rod 402, under the action of the force, the second supporting piece 405 will be inclined to the horizontal direction and horizontally moved downward, so that the lifting is realized within the range of the obstacle 6, and the lifting is completed until the lifting is completed);

[0072] ④Drag the first lifting rod 101 to the fourth direction of the lifting rod again, and at this time, the first supporting piece 302 will also enter the bottom of the object;

[0073] V. The first hoist 101 is returned to the normal position, and the lifting is performed.

[0074] After the above steps are performed in sequence, the lifting of the object is completed, and the lifting weight can be used to sense whether the lifting is completed, and from the perspective of technical improvement, a sensor can be added to sense and identify whether the lifting is completed, and if not, the above steps can be repeated.

[0075] In summary, the hoist provided by the embodiments of the present utility model, by connecting the second hoist and the third hoist at the bottom end of the first hoist, the top end of the third hoist is hinged to the bottom end of the first hoist, the first support at the bottom end of the second hoist is arranged opposite to the second support at the bottom end of the fourth hoist, for clamping and carrying the object to be hoisted, the fourth hoist is arranged between the first hoist and the third hoist, the bottom of the fourth hoist is connected to the top end of the third hoist through the telescopic member, and the total length of the fourth hoist and the third hoist is automatically controlled through the telescoping of the telescopic member, so that when the object to be hoisted has no hoisting hole, the total length of the fourth hoist and the third hoist can be automatically controlled due to the presence of the telescopic member, the object with different depth clearance can be hoisted, as long as the bottom space size is met in the transverse space, the long object, large object or heavy object can be quickly and non-destructively taken out in the narrow space, the disturbance to the object during the lifting process is minimized, the overall stability of the object structure is maintained, and the construction efficiency is improved.

[0076] The hoist provided by the present utility model is described in detail above. In this paper, specific examples are applied to describe the principles and implementation methods of the present utility model, and the above examples are only used to help understand the method and core idea of the present utility model. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present utility model without departing from the principles of the present utility model, and these improvements and modifications also fall within the protection scope of the present utility model.

Claims

1. A spreader, characterized in that, The utility model provides a kind of crane, including first boom, second boom, third boom and fourth boom, the bottom end of the first boom is connected with the top end of the second boom, the top end of the third boom, the top end of the third boom is hinged with the bottom end of the first boom, the bottom end of the second boom is provided with first support piece, the bottom end of the fourth boom is provided with second support piece, the end of the first support piece and the second support piece is set to each other, for clamping and carrying the object to be hoisted, the top end of the fourth boom is hinged with the bottom end of the first boom, the bottom of the fourth boom is connected with the top end of the third boom by telescopic piece, and the total length of the fourth boom, the third boom is automatically controlled by the telescopic piece, the angle between the first support piece and the second boom is acute, the angle between the second support piece and the third boom is acute.

2. The spreader of claim 1, wherein It also includes an angle control member arranged between the second boom and the third boom for controlling the angle between the second boom and the third boom, and the angle control member is a spring or a telescopic cylinder.

3. The spreader of claim 2, wherein It also includes a support member, a first end of the support member is hinged with one of the first support member or the second support member, and a second end of the support member is located on the upper surface of the unconnected end of the first support member or the second support member.

4. The spreader of claim 3, wherein It also includes a support groove arranged in the first support member or the second support member for accommodating the support member, the support member is used to separate the first support member and the second support member in a static state, so that the opening between the first support member and the second support member is larger than the transverse dimension of the object to be hoisted, the second boom is welded with the first support member, the fourth boom is welded with the second support member, and the first support member and the second support member are support members with a wedge-shaped L-shaped structure.

5. The spreader of claim 1, wherein The top end of the second boom is hinged or fixedly connected with the bottom end of the first boom, and the second boom and the third boom are located on the same side or different sides of the first boom.

6. The spreader of claim 5, wherein It also includes a mounting groove arranged at the bottom end of the first boom, the top end of the second boom and the third boom is mounted in the mounting groove, and the first boom is a hollow cuboid structure boom.

7. The spreader of claim 1, wherein The first boom is coaxially connected with the second boom and the third boom through a connecting member, and the connecting member is a bolt or a pin.

8. The spreader of claim 1, wherein It also includes a handle arranged at the top end of the first boom, the handle is welded or clamped with the first boom, the top of the handle is provided with a cylindrical structure, the bottom of the handle is provided with a mouth-shaped fixing structure, and the handle is connected with the first boom through the mouth-shaped fixing structure.

9. The spreader of claim 1, wherein It also includes a hollow channel arranged at the bottom of the fourth boom, the telescopic member is arranged in the hollow channel, and the telescopic member is fixed in the hollow channel by a baffle, and the lower end of the hollow channel is provided with a hollow seal, and the transverse dimension of the hollow seal is smaller than the transverse dimension of the hollow channel.

10. A spreader according to any one of claims 1-9, characterized in that The first hanging rod is provided with a restraint member sleeved with the outer wall of the first hanging rod, the third hanging rod is surrounded in the inner space of the restraint member, the transverse dimension of the restraint member gradually increases from top to bottom, and the restraint member is fixed to the hook of the outer wall of the first hanging rod through a cable chain.

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