An adjustable four-point lifting device

Abstract

The present application provides an adjustable four-point lifting device, comprising: an adjustable support frame, an upper lifting strap, and a lower lifting strap. The adjustable support frame includes two crossbeam assemblies capable of adjusting lengths. The two crossbeam assemblies are arranged crosswise in the horizontal direction. The two ends of the two crossbeam assemblies respectively constitute four support parts of the adjustable support frame. The two crossbeam assemblies are oriented in opposite directions in the height direction so that the heights of the four support parts are equal, and an avoidance gap is left in the height direction at the intersection position of the two crossbeam assemblies. Four upper lifting straps are provided, one end of each upper lifting strap is used to hang on a hook, and the other end of each upper lifting strap is connected to one of the four support parts. Four lower lifting straps are provided, one end of each lower lifting strap is connected to one of the four support parts, and the other end of each lower lifting strap is used to mount the equipment to be lifted. The lifting device of the present application can adjust the position of the support point, thereby realizing the lifting of equipment of different sizes, improving versatility.

Description

Technical Field

[0001] The present application relates to the technical field of optical equipment lifting devices, and more specifically, to an adjustable four-point lifting device. Background Art

[0002] Optical equipment such as telescopes require multiple lifting and handling during assembly, commissioning, and transportation. During the lifting process, tools such as lifting ropes must not touch the optical equipment, so a lifting device is required to support the lifting ropes. Furthermore, to ensure that the equipment is not prone to tipping during the lifting process, the lifting point should be as far away from the center of mass of the equipment as possible. To this end, Chinese invention patent application publication number CN110550539A discloses an improved frame-type lifting device, see attached. Figure 1 The device uses a square frame as the supporting frame, with four steel wire ropes hanging on the hook at the top, and the four steel wire ropes at the bottom are connected to the equipment through the extension seat assembly to achieve the lifting of the equipment.

[0003] However, this frame-type lifting device takes up a large space during transportation and daily storage, has many parts, and the preparation work before lifting is also relatively cumbersome. In addition, the size of its supporting frame cannot be adjusted, and it can only be used to lift equipment of similar size. At the same time, since the position of the equipment lifting point is limited by the position of the four supporting points of the supporting frame, it cannot be selected and adjusted at will, which also makes this lifting device not very versatile. Summary of the Invention

[0004] The purpose of this application is to solve at least one of the technical problems existing in the prior art and to provide an adjustable four-point lifting device that can adjust the distance between the two relative support points of the lifting device to achieve the lifting of equipment of different sizes.

[0005] An embodiment of the present application provides an adjustable four-point lifting device, comprising: an adjustable support frame, the adjustable support frame comprising two cross-beam assemblies capable of adjusting lengths, the two cross-beam assemblies being arranged crosswise in the horizontal direction, the two ends of the two cross-beam assemblies respectively constituting four support portions of the adjustable support frame, the two cross-beam assemblies being oriented in opposite directions in the height direction so that the four support portions are of equal height, and a clearance is left in the height direction at the intersection of the two cross-beam assemblies;

[0006] An upper sling, wherein four upper slings are provided, one end of each upper sling is used to be hung on a hook, and the other end of each upper sling is connected to one of the four supporting parts;

[0007] There are four lower slings, one end of each lower sling is connected to one of the four support parts, and the other end of each lower sling is used to hang the equipment that needs to be lifted.

[0008] Optionally, the beam assembly includes an outer beam, an inner beam and a pin, the outer beam is provided with a hollow channel along its own length direction, the inner beam can be inserted into the hollow channel, and the outer beam is provided with a first pin hole penetrating the wall of the hollow channel, and the inner beam is provided with a second pin hole of the same specification corresponding to the first pin hole, and the pin is inserted into the overlapping first pin hole and the second pin hole to connect the outer beam and the inner beam, and at least one of the first pin hole and the second pin hole has no less than two, so that the length of the inner beam inserted into the outer beam can be adjusted.

[0009] Optionally, the crossbeam assembly further includes a first locking nut, which is screwed onto the pin to fix the pin.

[0010] Optionally, two or more first pin holes are provided on the outer crossbeam, and the intervals between each first pin hole are equal; two or more second pin holes are provided on the inner crossbeam, and the intervals between each second pin hole are equal.

[0011] Optionally, the outer crossbeam includes a first rod and a first end, one end of the first rod is connected to the first end, and the other end of the first rod is provided with the hollow channel; the inner crossbeam includes a second rod and a second end, one end of the second rod is connected to the second end, and the other end of the second rod is used to insert into the hollow channel, and the second end and the first end both constitute the support part of the adjustable support frame.

[0012] Optionally, the first rod is a first square tube, and the first end is a first square frame; the second rod is a second square tube, and the second end is a second square frame.

[0013] Optionally, the first end and the second end are both provided with an upper connecting hole and a lower connecting hole, an upper sling rod is inserted into the upper connecting hole, and the upper sling rod is used to connect the upper sling, and a lower sling rod is inserted into the lower connecting hole, and the lower sling rod is used to connect the lower sling.

[0014] Optionally, the crossbeam assembly also includes four second locking nuts, which are respectively tightened on the upper sling rod and the lower sling rod at the first end and the second end, so that the upper sling rod and the lower sling rod are respectively fixed in the upper connecting hole and the lower connecting hole.

[0015] Optionally, the outer cross beam further includes a first rib plate connected between the first rod and the first end portion; the inner cross beam further includes a second rib plate connected between the second rod and the second end portion.

[0016] Optionally, a distance between the upper connection hole at the first end and the lower connection hole at the first end is D, and a distance between the upper connection hole at the second end and the lower connection hole at the second end is also D;

[0017] The distance from the lower connecting hole of the first end to the farthest surface of the outer beam along the height direction is H, the distance from the lower connecting hole of the second end to the farthest surface of the inner beam along the height direction is also H, and D is greater than 2H.

[0018] According to the adjustable four-point lifting device of the embodiment of the present application, because the adjustable support frame includes two crossbeam assemblies of adjustable length, the two ends of the crossbeam assemblies constitute the support parts of the adjustable support frame, and the two crossbeam assemblies leave an avoidance gap in the height direction, so the positions of the two relative support parts of the adjustable support frame can be adjusted, and the support points during the lifting process are located on the support parts, so the positions of the support points can also be adjusted. In this way, the positions of the lifting points are no longer restricted by the fixed positions of the support points, and can be freely selected and adjusted to meet the needs of lifting equipment of different sizes, thereby achieving the lifting of equipment of different sizes and improving the versatility of the lifting device. In addition, because the adjustable four-point lifting device of the embodiment of the present application has a simple structure, fewer parts, and its crossbeam assembly is adjustable in length, it is also easy to store during transportation and daily storage, occupies less space, and the preparation work before lifting can be simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of an improved frame-type lifting device in the prior art;

[0020] Figure 2 1 is a schematic structural diagram of an adjustable four-point lifting device provided in an embodiment of the present application;

[0021] Figure 3 1 is a schematic structural diagram of a crossbeam assembly of an adjustable four-point lifting device provided in an embodiment of the present application;

[0022] Figure 4 1 is a schematic structural diagram of an outer crossbeam of an adjustable four-point lifting device provided in an embodiment of the present application;

[0023] Figure 5 This is a schematic structural diagram of an inner crossbeam of an adjustable four-point lifting device provided in an embodiment of the present application.

[0024] The reference numerals in the specification are as follows:

[0025] 1. Upper sling; 2. Crossbeam assembly; 21. Upper sling rod; 22. Second locking nut; 23. Outer crossbeam; 23-1. First end; 23-2. First rib; 23-3. First rod; 23-4. Upper connecting hole; 23-5. Lower connecting hole; 24. Pin; 25. First locking nut; 26. Inner crossbeam; 26-1. Second end; 26-2. Second rib; 26-3. Second rod; 27. First pin hole; 28. Second pin hole; 3. Lower sling. DETAILED DESCRIPTION

[0026] Although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concepts of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

[0027] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0028] See also Figure 2-5 An embodiment of the present application provides an adjustable four-point lifting device for lifting optical equipment such as telescopes with an optical system. The lifting device includes an upper lifting strap 1, a lower lifting strap 3 and an adjustable support frame.

[0029] Among them, the adjustable support frame includes two beam assemblies 2 with adjustable lengths, the two beam assemblies 2 are cross-arranged in the horizontal direction, the two ends of the two beam assemblies 2 respectively constitute the four support parts of the adjustable support frame, the two beam assemblies 2 are oriented in opposite directions in the height direction so that the heights of the four support parts are equal, and the two beam assemblies 2 leave an avoidance gap along the height direction at the intersection position.

[0030] It is easy to understand that the support part can provide a connection position for the upper sling 1 and the lower sling 3 used to achieve lifting, so that the support point that bears the weight of the optical device during the actual lifting process is also located on the support part. By adjusting the position of the support part, the purpose of adjusting the position of the support point can be achieved.

[0031] It is easy to understand that because the avoidance gap is left between the two beam assemblies 2, the two beam assemblies 2 can be made to have no contact with each other, so that the length of each beam assembly 2 can be adjusted individually, so that the position of the support parts at both ends of each beam assembly 2 can be adjusted.

[0032] There are four upper slings 1 , one end of each upper sling 1 is used to hang on a hook, and the other end of each upper sling 1 is connected to one of the four supporting parts.

[0033] The upper sling 1 is used to connect the hook and the support portion, allowing the hook to provide lifting tension to the support portion, thereby enabling the support portion to connect to the lower sling 3 described below and carry the weight of the equipment to be lifted. The hook here is generally the hook of a lifting machine. By providing four upper slings 1, they can be connected to the four support portions of the adjustable support frame accordingly, thereby ensuring that the support portion is securely hung on the hook.

[0034] There are four lower slings 3 , one end of each lower sling 3 is connected to one of the four support parts, and the other end of each lower sling 3 is used to hang the equipment that needs to be lifted.

[0035] The lower sling 3 is used to connect the support portion to the equipment to be lifted, so that the support portion and the lower sling 3 can provide the lifting force required for the equipment to be lifted. By providing four lower slings 3, the center of mass of the equipment to be lifted can be located between the four lower slings 3, thereby preventing the lifted equipment from tipping over during the lifting process.

[0036] It is easy to understand that the connection point between the lower sling 3 and the hoisted equipment is the lifting point. When using the lifting device provided by this embodiment, the lifting point can be freely selected according to the size, shape, characteristics, and mass distribution of the equipment to be lifted, and it is only necessary to adjust the connection point between the lower sling 3 and the hoisted equipment accordingly.

[0037] It should be noted that the upper lifting belt 1 and the lower lifting belt 3 can be made of standard lifting belts of different specifications according to the weight of the equipment to be lifted, so as to ensure the safety of the lifting process.

[0038] The adjustable four-point lifting device provided in the embodiment of the present application has an adjustable support frame including two crossbeam assemblies of adjustable length, the two ends of the crossbeam assemblies forming the support parts of the adjustable support frame, and the two crossbeam assemblies have an avoidance gap in the height direction, so that the positions of the two relative support parts of the adjustable support frame can be adjusted, and the support points during the lifting process are located on the support parts, so the positions of the support points can also be adjusted. In this way, the positions of the lifting points are no longer restricted by the fixed positions of the support points, and can be freely selected and adjusted to meet the needs of lifting equipment of different sizes, thereby achieving the lifting of equipment of different sizes and improving the versatility of the lifting device. In addition, because the adjustable four-point lifting device provided in the embodiment of the present application has a simple structure, fewer parts, and its crossbeam assembly is adjustable in length, it is also easy to store during transportation and daily storage, occupies less space, and the preparation work before lifting can be simplified.

[0039] See also Figure 3-5 In one embodiment, the crossbeam assembly 2 includes an outer crossbeam 23, an inner crossbeam 26, and a pin 24. The outer crossbeam 23 and the inner crossbeam 26 are connected by the pin 24. The outer crossbeam 23 has a hollow channel along its length, and the inner crossbeam 26 can be inserted into the hollow channel. As will be readily understood, the size of the inner crossbeam 26 is slightly smaller than the inner diameter of the hollow channel, so that the inner crossbeam 26 can be inserted into the hollow channel.

[0040] The outer crossbeam 23 is provided with a first pin hole 27 extending through the wall of the hollow passage, and the inner crossbeam 26 is provided with a second pin hole 28 of the same size corresponding to the first pin hole 27. Thus, when it is necessary to connect the outer crossbeam 23 and the inner crossbeam 26, the inner crossbeam 26 only needs to be inserted into the hollow passage, with at least one of the first pin hole 27 and the second pin hole 28 aligned. The pin 24 is then inserted into the aligned first pin hole 27 and the second pin hole 28 to connect the outer crossbeam 23 and the inner crossbeam 26.

[0041] It is easy to understand that by adjusting the positions of the overlapping first and second pin holes 27 and 28, the length of the inner crossbeam 26 extending into the hollow channel can be changed, thereby adjusting the length of the crossbeam assembly 2. In other words, when the length of the crossbeam assembly 2 needs to be shortened, the length of the inner crossbeam 26 extending into the hollow channel is increased, so that the second pin hole 28 on the inner crossbeam 26, which is used to overlap with the first pin hole 27 on the outer crossbeam 23, is closer to the inside of the hollow channel; when the length of the crossbeam assembly 2 needs to be extended, the length of the inner crossbeam 26 extending into the hollow channel is reduced, so that the second pin hole 28 on the inner crossbeam 26, which is used to overlap with the first pin hole 27 on the outer crossbeam 23, is closer to the outside of the hollow channel.

[0042] It is easy to understand that in order to adjust the length of the beam assembly 2, at least one of the first pin hole 27 and the second pin hole 28 has no less than two, so that the positions of the overlapping first pin hole 27 and the second pin hole 28 can be changed.

[0043] Preferably, in one embodiment, in order to make the second pin holes 28 on the inner beam 26 accurately correspond to the first pin holes 27 on the outer beam 23 to facilitate length adjustment, the spacing distance between the first pin holes 27 is equal to the spacing distance between the second pin holes 28.

[0044] Preferably, in one embodiment, two or more first pin holes 27 are provided on the outer crossbeam 23, and the intervals between each first pin hole 27 are equal; two or more second pin holes 28 are provided on the inner crossbeam 26, and the intervals between each second pin hole 28 are equal.

[0045] By setting the spacing distances between each of the first pin holes 27 to be equal and the spacing distances between each of the second pin holes 28 to be equal, it can be ensured that the length changed each time the length of the beam assembly 2 is adjusted is an integer multiple of the spacing distances between the first pin holes 27 or the second pin holes 28, so that the required length of the beam assembly 2 can be obtained more conveniently.

[0046] See also Figure 3-5In one embodiment, the outer crossbeam 23 is provided with four first pin holes 27 on the wall surface of the hollow channel, the inner crossbeam 26 is provided with four second pin holes 28 corresponding to the four first pin holes 27, and two pins 24 are provided. To ensure a secure connection between the outer crossbeam 23 and the inner crossbeam 26, any two of the four first pin holes 27 coincide with any two of the four second pin holes 28, and the two pins 24 are respectively inserted into the overlapping first pin holes 27 and second pin holes 28. When two pins 24 are used to connect the outer crossbeam 23 and the inner crossbeam 26, the four first pin holes 27 and the four second pin holes 28 provide a total of six different lengths for the crossbeam assembly 2 to choose from.

[0047] See also Figure 3 In one embodiment, the crossbeam assembly 2 further includes a first locking nut 25 , which is screwed onto the pin 24 to fix the pin 24 .

[0048] It is easy to understand that in order to ensure a stable connection between the outer crossbeam 23 and the inner crossbeam 26 , it is necessary to ensure that the pin 24 cannot fall out of the first pin hole 27 and the second pin hole 28 , so the first locking nut 25 is provided.

[0049] See also Figure 3-5 In one embodiment, the outer crossbeam 23 includes a first rod 23-3 and a first end 23-1. One end of the first rod 23-3 is connected to the first end 23-1, and the other end of the first rod 23-3 is provided with the hollow channel. The inner crossbeam 26 includes a second rod 26-3 and a second end 26-1. One end of the second rod 26-3 is connected to the second end 26-1, and the other end of the second rod 26-3 is configured to be inserted into the hollow channel. The second end 26-1 and the first end 23-1 both constitute the support portion of the adjustable support frame.

[0050] It is easy to understand that because the second end 26-1 and the first end 23-1 both constitute the support portion of the adjustable support frame, the second end 26-1 on the inner beam 26 and the first end 23-1 on the outer beam 23 are exactly the same in size and shape.

[0051] See also Figure 3-5 In one embodiment, the first rod 23 - 3 is a first square tube, and the first end 23 - 1 is a first square frame; the second rod 26 - 3 is a second square tube, and the second end 26 - 1 is a second square frame.

[0052] By configuring both the first rod 23-3 and the second rod 26-3 as square tubes, processing and manufacturing are facilitated, while also facilitating accurate insertion of the first rod 23-3 of the inner crossbeam 26 into the hollow tube, thereby facilitating alignment and coincidence of the second pin hole 28 with the first pin hole 27. By configuring both the first terminal and the second terminal as square frames, processing and manufacturing are facilitated, as well as the design of the upper connecting hole 23-4 and the lower connecting hole 23-5 described below, thereby facilitating assembly and disassembly of the upper and lower sling rods 21 and 27 described below.

[0053] See also Figure 3-5 In one embodiment, the first end portion 23-1 and the second end portion 26-1 are both provided with an upper connecting hole 23-4 and a lower connecting hole 23-5, and an upper sling rod 21 is inserted into the upper connecting hole 23-4, and the upper sling rod 21 is used to connect the upper sling 1, and a lower sling rod is inserted into the lower connecting hole 23-5, and the lower sling rod is used to connect the lower sling 3.

[0054] By inserting the upper sling rod 21 into the upper connecting hole 23-4 and the lower sling rod into the lower connecting hole 23-5, the upper sling rod 21 and the lower sling rod can be easily installed, so that the upper sling rod 21 and the lower sling rod provide connection positions for the upper sling 1 and the lower sling 3 respectively.

[0055] See also Figure 3-5 In one embodiment, the upper connection hole 23-4 and the lower connection hole 23-5 have the same shape and size, and the upper sling rod 21 and the lower sling rod have the same shape and size. With this arrangement, the upper sling rod 21 and the lower sling rod can be inserted into either the upper connection hole 23-4 or the lower connection hole 23-5, facilitating quick installation.

[0056] See also Figure 3-5 In one embodiment, the crossbeam assembly 2 further includes four second locking nuts 22, which are respectively screwed onto the upper sling rod 21 and the lower sling rod at the first end 23-1 and the second end 26-1, so that the upper sling rod 21 and the lower sling rod are respectively fixed in the upper connecting hole 23-4 and the lower connecting hole 23-5.

[0057] By using the four second locking nuts 22 to lock the upper sling rod 21 and the lower sling rod, the upper sling rod 21 and the lower sling rod can be prevented from falling out of the upper connecting hole 23-4 and the lower connecting hole 23-5, thereby ensuring the safety of the lifting process.

[0058] See also Figure 3-5 In one embodiment, the outer crossbeam 23 further includes a first rib 23-2, which is connected between the first rod 23-3 and the first end 23-1; the inner crossbeam 26 further includes a second rib 26-2, which is connected between the second rod 26-3 and the second end 26-1.

[0059] It is easy to understand that the first rib 23 - 2 and the second rib 26 - 2 can respectively increase the strength of the outer beam 23 and the inner beam 26 , thereby increasing the lifting weight of the beam assembly 2 .

[0060] Preferably, in one embodiment, the first end portion 23-1, the first rib 23-2 and the first rod 23-3 are connected together by welding, and the second end portion 26-1, the second rib 26-2 and the second rod 26-3 are connected together by welding.

[0061] See also Figure 4-5 In one embodiment, the distance from the upper connecting hole 23-4 of the first end portion 23-1 to the lower connecting hole 23-5 of the first end portion 23-1 is D, and the distance from the upper connecting hole of the second end portion 26-1 to the lower connecting hole of the second end portion 26-1 is also D; the distance from the lower connecting hole 23-5 of the first end portion 23-1 to the farthest surface of the outer beam 23 along the height direction is H, and the distance from the lower connecting hole of the second end portion 26-1 to the farthest surface of the inner beam 26 along the height direction is also H, and D is greater than 2H.

[0062] It is easy to understand that based on the fact that the two beam assemblies 2 are facing in opposite directions in the height direction, the avoidance gap between the two beam assemblies 2 can be calculated as D-2H. In order to ensure that the two beam assemblies 2 are independent of each other and do not contact each other, which is conducive to adjusting their respective lengths, the avoidance gap must be greater than zero, that is, D must be set to be greater than 2H.

[0063] See also Figure 4-5 In one embodiment, the distance from the lower connecting hole 23-5 of the first end portion 23-1 to the middle surface of the outer crossbeam 23 is F, and the distance from the lower connecting hole of the second end portion 26-1 to the middle surface of the inner crossbeam 26 is also F, and F is greater than zero.

[0064] Preferably, in one embodiment, D-2H≥20 mm. In other words, setting the avoidance gap to be greater than or equal to 20 mm facilitates processing and manufacturing of the crossbeam assembly 2.

[0065] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

[0066] The above specific implementation methods of this application do not constitute a limitation on the scope of protection of this application. Any other corresponding changes and modifications made based on the technical concept of this application should be included in the scope of protection of the claims of this application.

Claims

1. An adjustable four-point lifting device, characterized in that: include: An adjustable support frame, the adjustable support frame includes two beam assemblies that can adjust the length, the two beam assemblies are cross-arranged in the horizontal direction, the two ends of the beam assemblies respectively constitute the four support parts of the adjustable support frame, the two beam assemblies are oriented in opposite directions in the height direction so that the heights of the four support parts are equal, and the two beam assemblies leave an avoidance gap in the height direction at the intersection position; the beam assembly includes an outer beam, an inner beam and a pin, the outer beam is provided with a hollow channel along its own length direction, the inner beam can be inserted into the hollow channel, and the outer beam is provided with a first pin hole penetrating on the wall of the hollow channel, and the inner beam is provided with the same pin hole corresponding to the first pin hole a second pin hole of a certain specification, the pin is inserted into the overlapping first pin hole and the second pin hole to connect the outer crossbeam and the inner crossbeam, and the number of at least one of the first pin hole and the second pin hole is not less than two, so that the length of the inner crossbeam inserted into the outer crossbeam can be adjusted; the outer crossbeam includes a first rod and a first end portion, one end of the first rod member is connected to the first end portion, and the other end of the first rod member is provided with the hollow channel; the inner crossbeam includes a second rod member and a second end portion, one end of the second rod member is connected to the second end portion, and the other end of the second rod member is used to be inserted into the hollow channel, and the second end portion and the first end portion both constitute the support portion of the adjustable support frame; An upper sling, wherein four upper slings are provided, one end of each upper sling is used to be hung on a hook, and the other end of each upper sling is connected to one of the four supporting parts; There are four lower slings, one end of each lower sling is connected to one of the four support parts, and the other end of each lower sling is used to hang the equipment that needs to be lifted.

2. The adjustable four-point lifting device according to claim 1, characterized in that: The crossbeam assembly further includes a first locking nut, which is screwed onto the pin to fix the pin.

3. The adjustable four-point lifting device according to claim 1, characterized in that: The outer crossbeam is provided with two or more first pin holes, and the intervals between each first pin hole are equal; the inner crossbeam is provided with two or more second pin holes, and the intervals between each second pin hole are equal.

4. The adjustable four-point lifting device according to claim 1, characterized in that The first rod is a first square tube, and the first end is a first square frame; the second rod is a second square tube, and the second end is a second square frame.

5. The adjustable four-point lifting device according to claim 1, characterized in that: The first end and the second end are both provided with an upper connecting hole and a lower connecting hole. An upper sling rod is inserted into the upper connecting hole, and the upper sling rod is used to connect the upper sling. A lower sling rod is inserted into the lower connecting hole, and the lower sling rod is used to connect the lower sling.

6. The adjustable four-point lifting device according to claim 5, characterized in that: The crossbeam assembly also includes four second locking nuts, which are respectively tightened on the upper sling rod and the lower sling rod at the first end and the second end, so that the upper sling rod and the lower sling rod are respectively fixed in the upper connecting hole and the lower connecting hole.

7. The adjustable four-point lifting device according to claim 1, characterized in that The outer cross beam further includes a first rib connected between the first rod and the first end; the inner cross beam further includes a second rib connected between the second rod and the second end.

8. The adjustable four-point lifting device according to claim 5, characterized in that: The distance between the upper connecting hole of the first end and the lower connecting hole of the first end is D, and the distance between the upper connecting hole of the second end and the lower connecting hole of the second end is also D; The distance from the lower connecting hole of the first end to the farthest surface of the outer beam along the height direction is H, the distance from the lower connecting hole of the second end to the farthest surface of the inner beam along the height direction is also H, and D is greater than 2H.

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