CN219429482U - Hoisting auxiliary tool - Google Patents

Abstract

This application is applicable to the hoist and mount field, provides a hoist and mount appurtenance, sets up with the tray cooperation, the tray has parallel arrangement's first through-hole and second through-hole, include: the lifting device comprises a lifting piece, wherein lifting lugs which are arranged in pairs for lifting are arranged on the upper side of the lifting piece along the length direction of the lifting piece, a plurality of lifting points are also arranged on the lifting piece, and the lifting points are arranged in rows along the length direction of the lifting piece; the plurality of supporting pieces are arranged in a matched mode, each supporting piece comprises a first supporting beam in plug-in fit with the first through hole and a second supporting beam in plug-in fit with the second through hole, connecting points are arranged at two ends of the first supporting beam and the second supporting beam, and each connecting point is exposed out of the tray when the supporting piece is plugged into the tray; and the connecting rope is used for connecting the hanging point and the connecting point. The application provides a hoist and mount appurtenance can improve convenience and efficiency that goods transported.

Description

Hoisting auxiliary tool

Technical Field

The application belongs to jack-up hoist and mount field, especially relates to a hoist and mount appurtenance.

Background

For bagged products, such as synthetic resin, chemical raw materials and the like, the bagged products are stacked on a tray during transportation, and the bagged products are rapidly transferred through movement of the tray. Specifically, the packaged products are stacked on a tray in a stacked manner, and a plurality of packaged products are stacked in a staggered manner for improving stability.

When the lifting is needed (for example, the lifting is transferred from a wharf to a ship), the lifting is generally carried out by encircling ropes (steel wire ropes, hanging straps and the like), firstly, the length of each rope on the periphery of the tray needs to be continuously adjusted to influence the transfer efficiency in order to prevent the lifting from being unstable, and in addition, the mode is difficult to realize batch operation and has lower efficiency.

Disclosure of Invention

The utility model provides an aim at overcomes above-mentioned prior art's not enough, provides a hoist and mount appurtenance, and it aims at improving convenience and efficiency that the goods transported.

Hoist and mount appurtenance sets up with the tray cooperation, the tray has parallel arrangement's first through-hole and second through-hole, hoist and mount appurtenance includes:

the lifting device comprises a lifting piece, wherein lifting lugs which are arranged in pairs for lifting are arranged on the upper side of the lifting piece along the length direction of the lifting piece, a plurality of lifting points are also arranged on the lifting piece, and the lifting points are arranged in rows along the length direction of the lifting piece;

the plurality of supporting pieces are arranged in a matched mode, each supporting piece comprises a first supporting beam in plug-in fit with the first through hole and a second supporting beam in plug-in fit with the second through hole, connecting points are arranged at two ends of the first supporting beam and the second supporting beam, and each connecting point is exposed out of the tray when the supporting piece is plugged into the tray;

and the connecting rope is used for connecting the hanging point and the connecting point.

Optionally, the first joist and the second joist each include a beam main body and a handle connected to the beam main body, when the first joist is inserted into the first through hole or the second joist is inserted into the second through hole, the handle is disposed in the first through hole/the second through hole and defines the movement of the tray in the horizontal direction together with the beam main body, and the two ends of the beam main body are provided with the connection points.

Optionally, the handle include with beam body parallel arrangement's spacing section, and two will spacing section's both ends with beam body connects the linkage segment, two linkage segment spacing section with beam body encloses and closes and form trapezoidally.

Optionally, the beam body is a channel steel, and the handle is a steel bar.

Optionally, the first joist and the second joist are symmetrically arranged along the length direction.

Optionally, the plurality of hanging points are arranged in two rows along the extending direction of the hanging piece.

Optionally, the lifting device comprises two parallel beams and a plurality of longitudinal beams with two ends respectively connected with the two beams, wherein the lifting points are arranged on the beams and positioned on extension lines of the longitudinal beams.

Optionally, the hoisting piece is a cross-hanging beam with a rectangular tubular section, and the hanging points are hooks welded on two sides of the hoisting piece.

Optionally, the connecting rope includes first linkage segment and the second linkage segment of detachable connection, first linkage segment will four of bearing piece the tie point is simultaneously with one end point connection of second linkage segment, another end point of second linkage segment with the hoisting point is connected.

Optionally, the connecting rope includes first rope, second rope, third rope and fourth rope, first rope with the second rope divides the row the both sides of tray and is used for connecting respectively two of homonymy the tie point, third rope one end is connected the hoisting point other end is equipped with the lifting hook, the fourth rope is cyclic annular, and can wear to link first rope the second rope and with the lifting hook colludes to connect.

The utility model provides a hoist and mount appurtenance utilizes the through-hole (first through-hole and the second through-hole) of current tray, through setting up two joists (first joist/second joist) and tray grafting cooperation, turns the weight of tray and the goods on it by two joists (first joist/second joist) bear, and the both ends of joist are connected through the hoisting point of connecting rope with hoist and mount, and the loop wheel machine lifts by crane hoist and mount and realizes the hoist and transfer to the tray and the goods on it. Because the supporting piece is inserted into the tray and the positions of the connecting points are fixed, for example, the sizes from the four connecting points of one supporting piece to the hanging point are consistent, the stability of the tray and the cargoes on the tray during the lifting and transferring can be ensured to the greatest extent. And the two joists are of rigid structures, and the effect of consistent sizes from the four connecting points to the hanging points can be realized by setting the fixed length of the connecting rope. Under the condition of fixed length of the connecting rope, during assembly, only two joists are needed to be inserted into the tray, and then the two ends of the connecting rope are connected with the connecting point and the hanging point, so that additional adjustment is not needed, the convenience of assembly is improved, and the efficiency of assembly is improved. In addition, the lifting piece is provided with a plurality of lifting points, so that a plurality of trays can be hung at the same time, and the effect of batch lifting and transferring of cargoes is achieved.

To sum up, the hoisting auxiliary that this application provided can improve convenience and efficiency that the goods transported.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of a hoisting auxiliary provided in an embodiment of the present application, which is a front view;

FIG. 2 is a schematic view of the connection of the support member to the tray in the embodiment of the present application;

FIG. 3 is a schematic view of the support and tray of FIG. 2 shown disassembled;

FIG. 4 is a schematic perspective view of a joist according to an embodiment of the present application;

FIG. 5 is a front view of the structure of FIG. 4;

FIG. 6 is a schematic view of the sling of the structure of FIG. 1, in elevation;

FIG. 7 is a schematic view of the sling of the structure of FIG. 6, shown in top view;

FIG. 8 is a schematic view of the sling of the structure of FIG. 6, shown in side elevation

Fig. 9 is another schematic view of the lifting auxiliary tool provided in the embodiment of the present application, which is a front view in a use state;

FIG. 10 is a side view of the structure of FIG. 9;

FIG. 11 is another schematic structural view of the lifting member in an embodiment of the present application, in front view;

FIG. 12 is a top view of the structure of FIG. 11;

fig. 13 is a side view of the structure of fig. 11.

Reference numerals illustrate:

10. hoisting auxiliary tools; 11. hoisting the piece; 111. lifting lugs; 112. a hanging point; 113. a cross beam; 114. a longitudinal beam; 12. a support; 12A, a first joist; 12B, a second joist; 121. a connection point; 122. a beam body; 123. a handle; 13. a connecting rope; 131. a first connection section; 132. a second connection section; 20. a tray; 201. a first through hole; 202. a second through hole; 30. and (5) cargo.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, in the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

It should be further noted that terms such as left, right, upper, and lower in the embodiments of the present application are merely relative terms or references to normal use states of the product, and should not be construed as limiting.

Referring to fig. 1 to 13, an exemplary description will now be given of a lifting aid 10 provided in the present application. The application provides a hoist and mount appurtenance 10, with tray 20 cooperation setting, tray 20 is used for bearing goods 30, generally is the product in bags, can be synthetic resin, industrial chemicals etc.. It will be appreciated that the tray 20 may also be used to carry box-packed articles, and is not limited in this regard.

In one embodiment, the tray 20 includes a carrier plate for placing the cargo 30 and a frame structure disposed under the carrier plate, with a space between the frame structures forming a through hole. In another embodiment, the tray 20 includes two flat plates parallel up and down and a plurality of connection blocks disposed between the two flat plates, and a space between the connection blocks forms a through hole. The pallet 20 is a conventional structure, and is not a point of improvement of the present embodiment, and the pallet 20 to which the present embodiment is applied may be any pallet having a carrying surface for placing the cargo 30 and a through hole penetrating through the side surface. In the structure shown in fig. 2 or 3, the tray 20 has two through holes in both the longitudinal direction and the width direction thereof. For convenience of description, two through holes on the same side and in parallel are named as a first through hole 201 and a second through hole 202, respectively.

Referring to fig. 1, a lifting auxiliary tool 10 provided in the present application includes a lifting member 11, a supporting member 12 and a connecting rope 13. The supporting piece 12 is inserted into the tray 20, the connecting rope 13 is used for hanging the supporting piece 12 on the hanging piece 11, and the hanging piece 11 is hung by the crane, so that the tray 20 and the goods 30 on the tray are transferred.

Specifically, lifting lugs 111 which are arranged in pairs for lifting are arranged on the upper side of the lifting piece 11 along the length direction of the lifting piece, and the lifting lugs 111 are used for being connected with a steel wire rope hung under a crane hook. The lifting lugs 111 are arranged in pairs, and are arranged on two sides in the length direction respectively, and the lifting lugs 111 are connected with the lifting hooks of the crane through steel wire ropes. It will be appreciated that the lifting lugs 111 are provided in pairs, typically one or two pairs. The lifting pieces 11 shown in fig. 6 to 8, and the lifting lugs 111 on the lifting pieces 11 shown in fig. 11 to 13 are two pairs, and the two pairs of lifting lugs 111 are respectively arranged on the two cross beams 113. The lifting lugs 111 on the lifting member 11 shown in fig. 9 to 10 are provided in a pair.

The sling 11 is further provided with a plurality of suspension points 112, the plurality of suspension points 112 being arranged in a row along the length direction of the sling 11.

Referring to fig. 1, 3 and 5, there are a plurality of supporting members 12, any supporting member 12 is matched with the tray 20, each supporting member 12 includes a first supporting beam 12A and a second supporting beam 12B, the first supporting beam 12A is matched with the first through hole 201 in a plugging manner, the second supporting beam 12B is matched with the second through hole 202 in a plugging manner, two ends of the first supporting beam 12A and two ends of the second supporting beam 12B are respectively provided with a connecting point 121, and each connecting point 121 is exposed out of the tray 20 when the supporting member 12 is plugged with the tray 20.

The connection string 13 is used to connect the suspension point 112 and the connection point 121.

During assembly, the two joists (the first joist 12A/the second joist 12B) are inserted into the two through holes (the first through hole 201/the second through hole 202) of the tray 20, then the connecting rope 13 connects the connecting point 121 of the bearing piece 12 with the lifting point 112 of the lifting piece 11, so that the assembly of the auxiliary lifting tool 10 is realized, the steel wire rope of the crane is connected with the lifting lug 111, and the crane lifts the auxiliary lifting tool 10, thereby realizing the lifting and transferring of the tray 20 and the cargoes 30 thereon.

A support 12 is provided in cooperation with a tray 20. One hanging piece 11 can simultaneously assemble a plurality of trays 20. It should be noted that, the assembly relationship between the tray 20 and the hanging points 112 of the hanging piece 11 may be one-to-one, that is, one tray 20 is correspondingly hung on one hanging point 112 (fig. 1), or one tray 20 may be hung on two hanging points 112 (fig. 9). Because there are a plurality of hanging points 112, the tray 20 can be selectively hung on one or two hanging points 112, and in the case that the hanging points 112 are dense, an operator can select the hanging points 112 according to the size of the tray 20, so that two adjacent trays 20 can both tend to be in a normal sagging state. The plurality of hanging points 112 are provided so that the hanging tool 11 has a condition for hanging a plurality of trays 20, thereby enabling a plurality of trays 20 to be transferred at a time.

According to the hoisting auxiliary 10 provided by the embodiment, through the through holes (the first through hole 201 and the second through hole 202) of the existing pallet 20, the pallet 20 and the cargoes 30 on the pallet 20 are carried by the two joists (the first joist 12A/the second joist 12B) in a plugging fit manner by arranging the two joists (the first joist 12A/the second joist 12B), two ends of the joists are connected with the hoisting points 112 of the hoisting piece 11 through the connecting ropes 13, and the crane is used for hoisting the hoisting piece 11 to hoist and transfer the pallet 20 and the cargoes 30 on the pallet.

In actual use, the tray 20 and the goods 30 thereon are a logistic operation unit, the supporting member 12 is in plug-in fit with the tray 20, and is synchronously transferred on the operation modules of port gathering transportation, in-plant short barge, wharf hoisting, ship-dispersing shipping, wharf hoisting, port dredging distribution, temporary storage in the port and the like along with the logistic operation unit, without repeating the dismounting operation with the tray 20. When the lifting is needed, the connecting rope 13 connects the connecting point 121 of the supporting member 12 with the lifting point 112, and the lifting machine lifts the lifting member 11 to realize lifting and transferring of all logistics operation units.

Since the support 12 is inserted into the tray 20 and the positions of the connection points 121 are fixed, if the sizes from the four connection points 121 of one support 12 to the hanging point 112 are uniform, the stability of the tray 20 and the goods 30 thereon during lifting and transferring can be ensured to the greatest extent. While the two joists are rigid structures, the effect of the uniform size of the four connection points 121 to the suspension point 112 can be achieved by setting the fixed length of the connection rope 13. Under the condition of fixed length of the connecting rope 13, during assembly, only two joists are needed to be inserted into the tray 20, and then two ends of the connecting rope 13 are connected with the connecting point 121 and the hanging point 112, so that additional adjustment is not needed, the convenience of assembly is improved, and the efficiency of assembly is improved.

The hoist 11 has a plurality of suspension points 112, and can simultaneously suspend a plurality of pallets 20, thereby realizing the effect of mass-lifting and transferring of the cargo 30.

In summary, the lifting auxiliary tool 10 provided in this embodiment can improve convenience and efficiency of transferring the cargo 30.

The connecting rope 13 may be a wire rope, a sling rope, a chain, or a combination thereof.

In an embodiment, referring to fig. 1, the connecting rope 13 includes a first connecting section 131 and a second connecting section 132 that are detachably connected, the first connecting section 131 connects the four connection points 121 of the support 12 with one end of the second connecting section 132, and the other end of the second connecting section 132 is connected with the hanging point 112. The first connection segment 131 is a flat belt sling to reduce its pressure against the cargo 30. It can be understood that the first connecting section 131 has four sections and is disposed corresponding to the four connecting points 121, and two ends of any first connecting section 131 are respectively connected to one connecting point 121 and the second connecting section 132. The four first connecting sections 131 are gathered at the connection part of the second connecting section 132, so as to achieve the effect of gathering the goods 30 to a certain extent. The second connection section 132 is a wire rope.

In another embodiment, a third connecting section (not shown) is further included between the first connecting section 131 and the second connecting section 132, and the first connecting section 131, the second connecting section 132 and the third connecting section are made of different materials according to different positions and stresses, so as to obtain a better assembly effect.

In one embodiment, the connecting rope 13 comprises a plurality of independent ropes, which can be two, three, four, five, six, etc.

In the case of two ropes, both ropes pass through the suspension point 112 of the suspension element 11 (connection to the suspension point 112 is achieved) and their four ends correspond to the four connection points 121 of the connection support element 12.

In the case of three ropes, one is equal in length in the upper two and lower, the lower two ropes have four ends corresponding to the four connection points 121 of the connection support 12, the upper end of the upper rope is connected to the hanging point 112, and the lower end thereof is hooked to the middle of the lower two ropes.

In the case of four ropes, one end of the four ropes may be connected to the four connection points 121, respectively, and the other end may be connected to the hanging point 112.

In another embodiment, four ropes are named as a first rope, a second rope, a third rope and a fourth rope for distinguishing, the first rope and the second rope are respectively arranged on two sides of the tray 20 and are respectively used for connecting two connecting points 121 on the same side, one end of the third rope is connected with a hanging point 112, the other end of the third rope is provided with a hanging hook, and the fourth rope is annular and can be penetrated and hooked with the first rope and the second rope. It is understood that the first rope and the second rope are provided in equal length. The first and second ropes are arranged at both sides of the tray 20 and are used to connect the two connection points 121 at the same side, respectively, to improve the convenience of the connection rope 13 and the supporter 12.

Preferably, the first and second cords are flat belt hoist cords to reduce the pressure thereof against the cargo 30. The third rope is a steel wire rope, the upper end of the third rope is fixedly connected with the lifting piece 11, and the lower end of the third rope is connected with a lifting hook so as to be hooked with the fourth rope. The fourth rope is a white nylon double-ring soft sling, and has better flexibility so as to facilitate folding and hooking.

The connection of the rope and the connection point 121 may be by means of D-rings, double J-hooks, pins, etc. The rope and the suspension point 112 are connected by a hook or shackle.

In another embodiment of the present application, referring to fig. 4 and 5, the first joist 12A and the second joist 12B each include a beam main body 122 and a handle 123 connected to the beam main body 122, two ends of the beam main body 122 are provided with connection points 121, and when the first joist 12A is plugged into the first through hole 201 or the second joist 12B is plugged into the second through hole 202, the handle 123 is disposed in the first through hole 201/the second through hole 202 and together with the beam main body 122 defines the movement of the tray 20 in the horizontal direction.

The connection point 121 is provided on the beam body 122, in other words, the beam body 122 is a load bearing member. A handle 123 is arranged on one side of the beam main body 122, so that on one hand can conveniently pick and place the tray 20, and on the other hand, the handle 123 is arranged on one side of the beam main body 122 and participates in limiting the tray 20 together. It will be appreciated that the width of the through hole (first through hole 201/second through hole 202) is larger, and the width of the beam main body 122 is smaller, and the handle 123 is disposed on one side of the width of the beam main body 122, so that the overall width of the beam main body 122 and the handle 123 is equal to the size of the through hole, and the beam main body 122 is prevented from moving in the through hole, thereby ensuring the relative fixation of the position of the connecting point 121, and further ensuring the stability of lifting. In other embodiments, the first joist 12A and the second joist 12B may be rectangular beams that fit through holes, in other words, the width of the beam body 122 is set to be equivalent to the through holes without providing the handles 123.

In this embodiment, the handle 123 includes a limiting section parallel to the beam main body 122, and two connecting sections connecting two ends of the limiting section with the beam main body 122, where the two connecting sections, the limiting section and the beam main body 122 enclose to form a trapezoid. The limiting section has a certain length and is matched with the hole wall of the through hole to limit the deflection of the two ends of the joist in the length direction. In other embodiments, the handle 123 may be configured in a half-waist-round shape.

In another embodiment of the present application, the first joist 12A and the second joist 12B are symmetrically arranged to achieve a foolproof effect. When assembled, the handle 123 faces inwardly and the beam body 122 faces outwardly. Under the condition that the size of the through hole is fixed, the inward arrangement of the lifting handle 123 is compared with the outward arrangement of the lifting handle 123, so that the distance between the two connecting points 121 located on the same side can be increased, and the lifting stability can be improved.

In this embodiment, the first joist 12A and the second joist 12B are symmetrically disposed along the length direction thereof. The first joist 12A and the second joist 12B are symmetrically arranged, so that the bearing member 12 forms a central symmetrical structure in the horizontal plane projection, the first joist 12A and the second joist 12B have the same structure, and the bearing member and the second joist 12B can be replaced by each other in a rotating mode during assembly. This arrangement can reduce the cost of producing the support 12.

In this embodiment, the beam body 122 is a channel steel. The upper surface of the beam body 122 is a bearing surface that abuts the tray 20. The handle 123 is a steel bar.

In this embodiment, the plurality of hanging points 112 are arranged in two rows along the length direction of the hanging piece 11.

In an embodiment, referring to fig. 9 to 10, the hanging member 11 is a cross hanging beam with a rectangular tubular cross section, and the hanging points 112 are hooks welded on two sides of the cross hanging beam. The connecting string 13 connects the tray 20 to the pair of hooks. The two sides of the hanging point 112 are beneficial to dispersing the stress of the transverse hanging beam and improving the stress concentration condition of the transverse hanging beam.

In the structure shown in fig. 10, two hooks located at opposite sides of the cross hanging beam are integrally provided to reduce welding points and facilitate simplified production and assembly.

In another embodiment, referring to fig. 6 to 8, the hanging member 11 is a frame structure. Specifically, the hoisting member 11 includes two parallel beams 113, and a plurality of longitudinal beams 114, two ends of which are respectively connected to the two beams 113, and the hoisting point 112 is disposed on the beams 113.

One beam 113 is provided with one row of hanging points 112, and two rows of hanging points 112 are symmetrically arranged. When assembled, one suspension point 112 may suspend one tray 20.

In this embodiment, the lifting point 112 is an arcuate shackle removably attached to the cross beam 113.

The lifting member 11 adopts a frame structure, on the one hand, the strength of the structure can be improved, and on the other hand, the two cross beams 113 have a certain interval, so that the lifting member 11 can lift the two trays 20 at the same time in a manner of being basically vertical to the place in the width direction.

The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but is intended to cover any and all modifications, equivalents, or alternatives falling within the spirit and principles of the present application.

Claims (10)

1. Hoist and mount appurtenance sets up with the tray cooperation, the tray has parallel arrangement's first through-hole and second through-hole, a serial communication port, includes:

the lifting device comprises a lifting piece, wherein lifting lugs which are arranged in pairs for lifting are arranged on the upper side of the lifting piece along the length direction of the lifting piece, and a plurality of lifting points are also arranged on the lifting piece and are arranged in rows along the length direction of the lifting piece;

the plurality of supporting pieces are arranged in a matched mode, each supporting piece comprises a first supporting beam in plug-in fit with the first through hole and a second supporting beam in plug-in fit with the second through hole, connecting points are arranged at two ends of the first supporting beam and the second supporting beam, and each connecting point is exposed out of the tray when the supporting piece is plugged into the tray;

and the connecting rope is used for connecting the hanging point and the connecting point.

2. The lifting aid of claim 1, wherein the first joist and the second joist each comprise a beam body and a handle connected to the beam body, the handle being disposed in the first through hole/second through hole and defining with the beam body movement of the tray in a horizontal direction when the first joist is plugged into the first through hole or the second joist is plugged into the second through hole, the connection points being provided at both ends of the beam body.

3. The lifting aid according to claim 2, wherein the handle comprises a limiting section arranged in parallel with the beam body, and two connecting sections connecting two ends of the limiting section with the beam body, and the two connecting sections, the limiting section and the beam body enclose to form a trapezoid.

4. The lifting aid of claim 2, wherein the beam body is a channel and the handle is a steel bar.

5. The lifting aid of claim 1, wherein the first joist and the second joist are symmetrically disposed along a length thereof.

6. A lifting aid as claimed in claim 1, characterized in that a plurality of the lifting points are arranged in two rows along the extension of the lifting element.

7. The hoisting auxiliary as claimed in claim 1, wherein the hoisting member comprises two parallel beams and a plurality of longitudinal beams with two ends respectively connected with the two beams, and the hoisting point is arranged on the beams and positioned on the extension line of the longitudinal beams.

8. The lifting aid according to claim 1, wherein the lifting member is a cross-section of rectangular tubular shape, and the lifting points are hooks welded on both sides of the lifting member.

9. Hoisting accessory as claimed in any of the claims 1-8, characterized in that the connecting rope comprises a first connecting section and a second connecting section detachably connected, the first connecting section connects the four connection points of the support simultaneously with one end point of the second connecting section, and the other end point of the second connecting section is connected with the hoisting point.

10. Hoisting accessory as claimed in any of claims 1-8, characterized in that the connecting rope comprises a first rope, a second rope, a third rope and a fourth rope, the first rope and the second rope are arranged separately on both sides of the pallet and are respectively used for connecting two connecting points on the same side, one end of the third rope is connected with the hoisting point, the other end of the third rope is provided with a lifting hook, and the fourth rope is annular and can be penetrated through the first rope, the second rope and hooked with the lifting hook.