Spreaders and lifting machinery

Abstract

The present invention relates to the technical field of engineering machinery, and provides a sling and a lifting machine, wherein the sling includes a middle crossbeam provided with a first connection portion for connecting to the lifting machine; two side crossbeam assemblies, each rotatably connected to the ends of the middle crossbeam, and the two side crossbeam assemblies are capable of switching between a first relative position and a second relative position. In the first relative position, the axes of the two side crossbeam assemblies coincide with the axis of the middle crossbeam; in the second relative position, the two side crossbeam assemblies are respectively located on either side of the axis of the middle crossbeam, and the angles between the axes of the two side crossbeam assemblies and the axis of the middle crossbeam are equal. The end of the side crossbeam assembly away from the middle crossbeam is provided with a second connection portion for connecting to a weight. This arrangement reduces the length of the sling in a folded state, stabilizes the center of gravity, and solves the problems of the foldable slings in the prior art, such as a large length and an unstable center of gravity, in a folded state.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to a sling and a lifting machinery. Background Art

[0002] A sling is a device used in lifting machinery to lift heavy objects. To facilitate transportation and storage of the sling, the sling is generally set in a foldable form.

[0003] However, the foldable slings in the prior art, especially the beam-type slings, have the two side beams located on the same side of the middle beam when folded, and the length of the middle beam needs to be greater than or equal to the sum of the lengths of the two side beams. This results in the sling having a large length even in the folded state, and will take up a large space during transportation. When the sling is in the unfolded state, the center of gravity of the two side beams and the center of gravity of the middle beam are basically located in the same vertical plane. When switching between the folded state and the unfolded state, the two side beams are located on the same side of the middle beam, and the center of gravity of the two side beams deviates significantly from the vertical plane where the center of gravity of the middle beam is located, causing the position of the center of gravity of the sling as a whole to change, and the center of gravity of the sling is unstable. For compact special cranes, the sling cannot be carried on the vehicle, and the sling needs to be disassembled to ensure the passability of the compact special crane, which is cumbersome to operate.

[0004] Therefore, how to solve the problems of the foldable spreader in the prior art, such as the large length and unstable center of gravity in the folded state, has become an important technical problem to be solved by those skilled in the art. Summary of the Invention

[0005] The present invention provides a sling and a lifting machinery, which are used to solve the defects of the foldable sling in the prior art, such as a large length and an unstable center of gravity in a folded state.

[0006] The present invention provides a sling, comprising:

[0007] The middle crossbeam is provided with a first connection portion for connecting to a lifting machine;

[0008] The two side cross beam assemblies are respectively rotatably connected to the two ends of the middle cross beam, and the two side cross beam assemblies can switch between a first relative position and a second relative position. In the first relative position, the axes of the two side cross beam assemblies coincide with the axis of the middle cross beam. In the second relative position, the two side cross beam assemblies are respectively located on both sides of the axis of the middle cross beam and the angles between the axes of the two side cross beam assemblies and the axis of the middle cross beam are equal. The end of the side cross beam assembly away from the middle cross beam is provided with a second connection part for connecting to a heavy object.

[0009] A sling provided according to the present invention further includes:

[0010] A driving device is provided between the side cross beam assembly and the middle cross beam, and is used for driving the side cross beam assembly to rotate relative to the middle cross beam.

[0011] According to a spreader provided by the present invention, the driving device includes a swing hydraulic cylinder, one of a cylinder barrel and an output shaft of the swing hydraulic cylinder is connected to the middle crossbeam, and the other is connected to the side crossbeam assembly.

[0012] A sling provided according to the present invention further includes:

[0013] A fixing member, when the two side cross beam assemblies are in the first relative position, the fixing member is used to limit the relative rotation between the side cross beam assemblies and the middle cross beam.

[0014] According to a sling provided by the present invention, the fixing member includes a latch body capable of reciprocating relative to the intermediate beam and a driving assembly for driving the latch body to move relative to the intermediate beam.

[0015] The latch body can be switched between a first position and a second position. In the first position, the latch body is simultaneously inserted into the interior of the middle cross beam and the side cross beam assembly. In the second position, the latch body is located outside the middle cross beam and the side cross beam assembly.

[0016] According to a sling provided by the present invention, the side beam assembly includes at least two beam sections and a driving mechanism, adjacent beams are slidably connected, and the sliding direction is parallel to the axis of the beam. The driving mechanism is used to drive the adjacent beams to slide relative to each other.

[0017] According to a sling provided by the present invention, the driving mechanism includes a transmission cylinder arranged between adjacent crossbeams, and the cylinder barrel and piston rod of the transmission cylinder are respectively connected to the adjacent crossbeams.

[0018] According to a sling provided by the present invention, when the side crossbeam assembly includes at least three crossbeam sections, the driving mechanism is a rope rack mechanism.

[0019] According to a sling provided by the present invention, a limiting assembly is provided on the middle crossbeam, and the limiting assembly is used to limit the rotation of the middle crossbeam relative to the lifting machinery.

[0020] The present invention also provides a lifting machinery comprising the above-mentioned lifting device.

[0021] The sling provided by the present invention includes a center crossbeam and two side crossbeam assemblies. The connection between the sling and the lifting machinery is achieved via a first connection portion on the center crossbeam. The two side crossbeam assemblies are rotatably connected to the ends of the center crossbeam, respectively. When the two side crossbeam assemblies rotate relative to the center crossbeam until the axes of the two side crossbeam assemblies coincide with the axis of the center crossbeam, the sling is in an extended state. When the two side crossbeam assemblies rotate relative to the center crossbeam until the two side crossbeam assemblies are located on opposite sides of the axis of the center crossbeam and the angles between the axes of the two side crossbeam assemblies and the axis of the center crossbeam are equal, the sling is in a folded state. In both the extended and folded states, the center of gravity of the sling is always located on the center crossbeam, and the center of gravity position is stable. Furthermore, when the sling is in the folded state, the two side crossbeam assemblies are located on opposite sides of the center crossbeam, preventing interference between the two side crossbeam assemblies. The length of the center crossbeam is not limited by the lengths of the two side crossbeam assemblies, which facilitates shortening the length of the center crossbeam, thereby shortening the length of the sling in the folded state. Thus, the problem of the foldable spreader in the prior art being relatively long and having an unstable center of gravity in the folded state is solved.

[0022] Furthermore, the lifting machinery provided by the present invention has the lifting device as described above, and thus also has the various advantages as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is a structural schematic diagram of the spreader provided by the present invention;

[0025] Figure 2 This is a schematic structural diagram of the sling provided by the present invention when it is installed on a crane truck;

[0026] Figure 3 It is a structural schematic diagram of the sling provided by the present invention in the unfolded state;

[0027] Figure 4 yes Figure 3 Middle AA section view;

[0028] Figure 5 yes Figure 3 Middle BB cross-section;

[0029] Figure 6 It is a schematic diagram of the connection structure between the middle cross beam and the side cross beam assembly provided by the present invention;

[0030] Figure 7 is a schematic structural diagram of the latch body provided by the present invention when it is in the second position;

[0031] Figure 8 is a schematic structural diagram of the latch body provided by the present invention when it is in the first position;

[0032] Figure 9 It is a structural schematic diagram of the side crossbeam assembly provided by the present invention;

[0033] Figure 10 It is a structural schematic diagram of the sling provided by the present invention when it is fully unfolded.

[0034] Reference numerals:

[0035] 1: Middle crossbeam; 2: First connecting part; 3: Side crossbeam assembly; 4: Second connecting part; 5: Fixing piece; 6: Swinging hydraulic cylinder; 7: Latch body; 8: Drive assembly; 9: Crossbeam; 10: Transmission cylinder; 11: Limiting column; 12: Limiting sleeve; 13: Double hook lifting mechanism; 14: Spring. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0037] The following combination Figures 1 to 10 The spreader of the present invention is described.

[0038] like Figures 1 to 10 As shown, the sling provided by the embodiment of the present invention includes a middle crossbeam 1, two side crossbeam assemblies 3 and a fixing member 5.

[0039] A first connecting portion 2 is provided on the middle crossbeam 1 for connecting the middle crossbeam 1 to the lifting machinery. Specifically, the first connecting portion 2 can be a lifting lug provided on the middle crossbeam 1. There are two lifting lugs provided, and the two lifting lugs are symmetrically distributed on both sides of the center of gravity of the middle crossbeam 1. The lifting machinery is provided with a double-hook lifting mechanism 13. The two hooks of the double-hook lifting mechanism 13 are connected to the two lifting lugs respectively, so as to connect the middle crossbeam 1 to the lifting machinery. Figure 2 .

[0040] The two side crossbeam assemblies 3 are respectively located at the two ends of the middle crossbeam 1. The end of the side crossbeam assembly 3 away from the middle crossbeam 1 is provided with a second connecting portion 4 for connecting a heavy object to lift the heavy object. The second connecting portion 4 can be specifically provided at the end of the side crossbeam assembly 3.

[0041] The two side cross beam assemblies 3 are rotatably connected to the two ends of the middle cross beam 1 respectively, and the two side cross beam assemblies 3 can switch between a first relative position and a second relative position.

[0042] When the two side crossbeam assemblies 3 are switched to the first relative position, the axes of the two side crossbeam assemblies 3 coincide with the axis of the middle crossbeam 1, and the spreader is in the deployed state. The two side crossbeam assemblies 3 have the same structural dimensions, and the center of gravity of the spreader is located on the middle crossbeam 1, and the center of gravity of the spreader coincides with the center of gravity of the middle crossbeam 1.

[0043] When the two side crossbeam assemblies 3 are switched to the second relative position, the two side crossbeam assemblies 3 are respectively located on either side of the axis of the middle crossbeam 1, and the angles between the axes of the two side crossbeam assemblies 3 and the axis of the middle crossbeam 1 are equal. At this time, the spreader is in a folded state, and the center of gravity of the spreader also coincides with the center of gravity of the middle crossbeam 1. When the spreader is in the folded state, the two side crossbeam assemblies 3 are respectively located on opposite sides of the middle crossbeam 1. The two side crossbeam assemblies 3 do not interfere with each other, and the length of the middle crossbeam 1 is not limited by the lengths of the side crossbeam assemblies 3. This helps to shorten the length of the middle crossbeam 1, thereby shortening the length of the spreader in the folded state.

[0044] Furthermore, during the folding or unfolding process of the spreader, the synchronous rotation of the two side beam assemblies 3 relative to the middle beam 1 can ensure that the spreader's center of gravity is always located on the middle beam 1. The spreader's center of gravity remains on the middle beam 1 in both the unfolded and folded states, and during both the folding and unfolding processes, ensuring a stable center of gravity position.

[0045] This solves the problems of conventional foldable spreaders, such as their large length and unstable center of gravity when folded. When used on compact special cranes, this spreader improves their stability and ensures the crane's passability during transportation without having to disassemble it, improving the crane's efficiency during transfers.

[0046] It should be noted that when the sling in this embodiment is connected to the boom of a crane and is in a folded state for transportation, the boom of the crane can be controlled to be slightly raised to meet the departure angle requirement of the crane and ensure the passability of the crane.

[0047] Specifically, first connecting lugs can be provided on the side crossbeam assemblies 3 and the middle crossbeam 1, and hinge shafts are used to hinge the first connecting lugs of the two side crossbeam assemblies 3 to the first connecting lugs on the middle crossbeam 1, respectively. The two hinge shafts are parallel to each other and are both arranged along the height direction of the middle crossbeam 1. The two hinge shafts are respectively located on the above-mentioned opposite sides of the middle crossbeam 1. When the sling in this embodiment is installed on a lifting machine, the middle crossbeam 1 and the side crossbeam assemblies 3 are both arranged in the horizontal direction, and the above-mentioned two hinge shafts are arranged in the vertical direction. The two side crossbeam assemblies 3 can rotate relative to the middle crossbeam 1 in the horizontal plane, with one side crossbeam assembly 3 rotating forward relative to the middle crossbeam 1 and the other side crossbeam assembly 3 rotating backward relative to the middle crossbeam 1.

[0048] The spreader in the embodiment of the present invention further includes a drive device, which is disposed between the side crossbeam assembly 3 and the middle crossbeam 1 and is configured to drive the side crossbeam assembly 3 to rotate relative to the middle crossbeam 1. The drive device enables automatic deployment and folding of the spreader, reducing manual operations and the labor intensity of operators.

[0049] In a specific embodiment, the driving device can be configured as a swing hydraulic cylinder 6, which includes a cylinder barrel, a rotary piston capable of rotating relative to the cylinder barrel, and an output shaft connected to the rotary piston. When the swing hydraulic cylinder 6 is in operation, the rotary piston drives the output shaft to rotate relative to the cylinder barrel, thereby outputting torque.

[0050] like Figure 6 By connecting one of the cylinder barrel and output shaft of the swing hydraulic cylinder 6 to the middle crossbeam 1 and the other to the side crossbeam assembly 3, the side crossbeam assembly 3 can be driven to rotate relative to the middle crossbeam 1. The axis of the output shaft is located on the axis of the hinge shaft between the side crossbeam assembly 3 and the middle crossbeam 1.

[0051] Specifically, the cylinder barrel of the oscillating hydraulic cylinder 6 can be fixedly connected to the middle crossbeam 1. The outer surface of the end of the output shaft of the oscillating hydraulic cylinder 6 is provided with a spline. A spline sleeve that cooperates with the spline is fixedly provided on the side crossbeam assembly 3. The spline and the spline sleeve cooperate to achieve the connection between the output shaft of the oscillating hydraulic cylinder 6 and the side crossbeam assembly 3. To prevent relative sliding between the spline sleeve and the side crossbeam assembly 3, a flat key can be provided between the spline sleeve and the side crossbeam assembly 3.

[0052] It should be noted that the aforementioned drive device can also be configured as a motor-driven device, with the motor housing fixedly connected to the middle crossbeam 1, the motor output shaft fixedly connected to the side crossbeam assembly 3, and the axis of the motor output shaft parallel to the rotation axis of the side crossbeam assembly 3 relative to the middle crossbeam 1. By controlling the operation of the motor, the side crossbeam assembly 3 can be driven to rotate relative to the middle crossbeam 1.

[0053] The sling in the embodiment of the present invention further includes a fixing member 5. When the two side beam assemblies 3 are in the first relative position, the fixing member 5 can limit the relative rotation between the side beam assemblies 3 and the middle beam 1, thereby ensuring the stability of the sling during operation.

[0054] The fixing member 5 is configured as a latch, specifically comprising a latch body 7 and a drive assembly 8. The latch body 7 is capable of reciprocating relative to the middle beam 1, and the drive assembly 8 is used to drive the latch body 7 to move relative to the middle beam 1.

[0055] The latch body 7 can be switched between a first position and a second position. When the latch body 7 is switched to the first position, the latch body 7 is simultaneously inserted into the interior of the middle crossbeam and the side crossbeam assembly 3, thereby achieving a pin connection between the side crossbeam assembly 3 and the middle crossbeam 1. When the latch body 7 is switched to the second position, the latch body 7 is located outside the middle crossbeam 1 and the side crossbeam assembly 3, thereby releasing the pin connection between the side crossbeam assembly 3 and the middle crossbeam 1.

[0056] In a specific embodiment, second connecting lugs can be provided on the side cross-beam assembly 3 and the middle cross-beam 1. The second connecting lugs on the side cross-beam assembly 3 and the second connecting lugs on the middle cross-beam 1 are parallel to each other. A first connecting hole is provided on the second connecting lug of the side cross-beam assembly 3, and a second connecting hole is provided on the second connecting lug of the middle cross-beam 1. When the two side cross-beam assemblies 3 are in a first relative position, the second connecting lugs on the side cross-beam assembly 3 and the second connecting lugs on the middle cross-beam 1 overlap, and the axis of the first connecting hole coincides with the axis of the second connecting hole.

[0057] The latch body 7 and the driving assembly 8 can be arranged on the middle cross beam 1 or on the side cross beam assembly 3, so that the axis of the latch body 7 is aligned with the first connecting hole or the second connecting hole.

[0058] Taking the latch body 7 and the drive assembly 8 arranged on the middle crossbeam 1 as an example, the structure of the drive assembly 8 is explained. The above-mentioned drive assembly 8 can be a telescopic hydraulic cylinder, which has a cylinder barrel and a piston rod that can move back and forth in a straight line relative to the cylinder barrel. The axis of the telescopic hydraulic cylinder coincides with the axis of the latch body 7, the cylinder barrel of the telescopic hydraulic cylinder is fixedly connected to the middle crossbeam 1, and the piston rod of the telescopic hydraulic cylinder is fixedly connected to the latch body 7. Controlling the telescopic action of the telescopic hydraulic cylinder can drive the latch body 7 to extend into and out of the first connecting hole and the second connecting hole, refer to Figure 7 and Figure 8 .

[0059] In this embodiment, two sets of second connecting lugs are installed between each side crossbeam assembly 3 and the middle crossbeam 1, distributed along the height of the sling. Accordingly, two latch bodies 7 are provided, and a double-rod hydraulic cylinder is used as the drive assembly 8. The double-rod hydraulic cylinder comprises a cylinder barrel and two piston rods that reciprocate relative to the cylinder barrel. The double-rod hydraulic cylinder is installed on the middle crossbeam 1, located between the two sets of second connecting lugs. The cylinder barrel of the double-rod hydraulic cylinder is fixedly connected to the middle crossbeam 1, and the two piston rods are connected to the latch bodies 7. Operation of the double-rod hydraulic cylinder can simultaneously drive the movement of both latch bodies 7.

[0060] In order to ensure the effectiveness of the pin connection between the latch body 7 and the first connecting hole and the second connecting hole, a spring 14 can be provided between the two latch bodies 7. The spring 14 can make the two latch bodies 7 tend to move away from each other. When the double-rod hydraulic cylinder fails, the pin connection between the latch body 7 and the side cross beam assembly 3 and the middle cross beam 1 can also be ensured, thereby avoiding the accidental falling off of the latch body 7.

[0061] It should be noted that the fixing member 5 can be directly selected from a latch cylinder or a double-head latch cylinder.

[0062] The side crossbeam assembly 3 can be configured as a structure in which multiple crossbeams 9 are folded by rotation. The connection structure between adjacent crossbeams 9 is similar to the connection structure between the side crossbeam assembly 3 and the middle crossbeam 1. Each side crossbeam assembly 3 includes the same number, structure, and size of crossbeams 9 to ensure the stability of the center of gravity of the spreader.

[0063] When the overall length of the spreader in the unfolded state is constant, setting the side cross beam assembly 3 in a foldable form is beneficial to further shortening the length of the spreader in the folded state.

[0064] In the embodiment of the present invention, the side cross beam assembly 3 is configured as a multi-section cross beam 9 telescopically adjustable. Figure 9 and Figure 10 Specifically, the side crossbeam assembly 3 includes a crossbeam 9 and a drive mechanism. The crossbeam 9 is provided with at least two sections. Adjacent crossbeams 9 are slidably connected, and the sliding direction is parallel to the axis of the crossbeam 9. The drive mechanism is used to drive adjacent crossbeams 9 to slide relative to each other.

[0065] When the two side beam assemblies 3 rotate to the first relative position, the adjacent beams 9 are driven to slide relative to each other by the driving mechanism, so that the working length of the sling can be adjusted steplessly, which can adapt to the lifting of heavy objects of different lengths and sizes, thereby improving the adaptability of the sling.

[0066] The drive mechanism includes a transmission cylinder 10, which is disposed between adjacent crossbeams 9. The transmission cylinder 10 may be a telescopic hydraulic cylinder, with the cylinder barrel and piston rod of the transmission cylinder 10 respectively connected to adjacent crossbeams 9. A corresponding telescopic hydraulic cylinder may be disposed between each pair of adjacent crossbeams 9.

[0067] In some specific embodiments, when the side crossbeam assembly 3 includes at least three crossbeams 9, the driving mechanism can be set as a rope arrangement mechanism, which includes a telescopic cylinder and a cable, and the transmission connection between the crossbeams 9 is realized through the telescopic cylinder and the cable.

[0068] It should be noted that the structural principle of using a rope arrangement mechanism to achieve telescopic adjustment is a mature existing technology for those skilled in the art, so it will not be described in detail here.

[0069] In the embodiment of the present invention, a limit assembly is provided on the middle crossbeam 1 to limit the rotation of the middle crossbeam 1 relative to the lifting machinery. When the sling of this embodiment is used on a crane, the stability of the sling can be ensured during the movement and transfer of the crane.

[0070] Specifically, the above-mentioned limiting assembly includes two sets of limiting posts 11 and limiting sleeves 12. The limiting posts 11 can extend into corresponding limiting sleeves 12. The axis direction of the limiting posts 11 and limiting sleeves 12 is parallel to the height direction of the sling. The two sets of limiting posts 11 and the two sets of limiting sleeves 12 are distributed along the length direction of the middle beam 1.

[0071] One of the above-mentioned limit column 11 and limit sleeve 12 is arranged on the middle crossbeam 1, and the other is arranged on the outer shell of the double-hook lifting mechanism 13 of the crane. When the first connecting part 2 on the middle crossbeam 1 is connected to the hook of the double-hook lifting mechanism 13, the axis of the limit column 11 coincides with the axis of the limit sleeve 12. The double-hook lifting mechanism 13 is in operation, and its hook drives the sling to rise and fall. When the hook drives the sling to rise, the limit column 11 gradually approaches the limit sleeve 12 until the limit column 11 extends into the interior of the limit sleeve 12. The interaction between the two groups of limit columns 11 and the limit sleeve 12 can prevent the middle crossbeam 1 from rotating relative to the outer shell of the double-hook lifting mechanism 13 and the crane, thereby ensuring the stability of the sling.

[0072] To ensure that the limiting column 11 can smoothly extend into the limiting sleeve 12 , the end of the limiting column 11 can be chamfered or formed into a conical structure, and correspondingly, an inner chamfer is provided at the end of the limiting sleeve 12 .

[0073] The sling, limiting column 11, limiting sleeve 12 and weight are all rigid bodies. When the crane drives the weight to rotate, the sling and the weight can be prevented from shaking and deflecting. When the crane drives the weight to rotate to the target position, the weight can be made to fall vertically from a stationary state, avoiding swinging during the falling process.

[0074] In summary, the sling in the embodiment of the present invention has a simple structure, compact layout, modular design, and occupies a small space, which meets the requirement of being carried on the crane truck and can improve the utilization efficiency of the crane truck during transfer.

[0075] On the other hand, an embodiment of the present invention further provides a lifting machinery comprising the sling provided by any of the above-mentioned embodiments. The sling provided by any of the above-mentioned embodiments has the advantages of a stable center of gravity and a relatively small length when folded. Therefore, the lifting machinery provided by the embodiment of the present invention also has the advantages of a stable center of gravity and a relatively small length when folded. The derivation process for the beneficial effects of the lifting machinery in the embodiment of the present invention is generally similar to the derivation process for the beneficial effects of the sling described above, and therefore will not be repeated here.

[0076] The lifting machinery in this embodiment can be a crane truck with a double-hook lifting mechanism, a bridge crane, etc.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A sling, characterized in that: include: The middle crossbeam is provided with a first connection portion for connecting to a lifting machine; The two side cross beam assemblies are respectively rotatably connected to the two ends of the middle cross beam, and the two side cross beam assemblies can switch between a first relative position and a second relative position. In the first relative position, the axes of the two side cross beam assemblies coincide with the axis of the middle cross beam, and the sling is in an unfolded state. In the second relative position, the two side cross beam assemblies are respectively located on both sides of the axis of the middle cross beam and the angles between the axes of the two side cross beam assemblies and the axis of the middle cross beam are equal. The sling is in a folded state, and the end of the side cross beam assembly away from the middle cross beam is provided with a second connecting portion for connecting to a heavy object. During the folding or unfolding process of the sling, the two side cross beam assemblies rotate synchronously relative to the middle cross beam to ensure that the center of gravity of the sling is always located on the middle cross beam. The side cross beam assembly includes at least two cross beam sections; The side cross beam assembly is configured to be a structural form in which the cross beam is folded by rotating, or the side cross beam assembly is configured to be a structural form in which the cross beam is telescopically adjusted.

2. The sling according to claim 1, characterized in that: Also includes: A driving device is provided between the side cross beam assembly and the middle cross beam, and is used for driving the side cross beam assembly to rotate relative to the middle cross beam.

3. The sling according to claim 2, characterized in that: The driving device includes a swing hydraulic cylinder, one of a cylinder barrel and an output shaft of the swing hydraulic cylinder is connected to the middle crossbeam, and the other is connected to the side crossbeam assembly.

4. The sling according to claim 1, characterized in that: Also includes: A fixing member, when the two side cross beam assemblies are in the first relative position, the fixing member is used to limit the relative rotation between the side cross beam assemblies and the middle cross beam.

5. The sling according to claim 4, characterized in that: The fixing member includes a latch body capable of reciprocating relative to the middle crossbeam and a driving assembly for driving the latch body to move relative to the middle crossbeam, the latch body being switchable between a first position and a second position. In the first position, the latch body is simultaneously inserted into the interior of the middle crossbeam and the side crossbeam assembly, and in the second position, the latch body is located outside the middle crossbeam and the side crossbeam assembly.

6. The sling according to claim 1, characterized in that: The side beam assembly further includes a driving mechanism, adjacent beams are slidably connected, and the sliding direction is parallel to the axis of the beam, and the driving mechanism is used to drive the adjacent beams to slide relative to each other.

7. The sling according to claim 6, characterized in that: The driving mechanism includes a transmission cylinder arranged between adjacent crossbeams, and a cylinder barrel and a piston rod of the transmission cylinder are respectively connected to the adjacent crossbeams.

8. The spreader according to claim 6, characterized in that: When the side beam assembly includes at least three sections of beams, the driving mechanism is a rope-row mechanism.

9. The spreader according to claim 1, wherein: A limiting assembly is provided on the middle crossbeam, and the limiting assembly is used to limit the rotation of the middle crossbeam relative to the lifting machinery.

10. A lifting machine, characterized in that: The method comprises the sling according to any one of claims 1 to 9.

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