Self-balancing lifting appliance device based on self weight of PK3 type laminated slab and using method

Abstract

The self-balancing lifting appliance device comprises a lifting appliance frame, two lifting lugs are symmetrically arranged at the upper end of the lifting appliance frame along the gravity center of the lifting appliance frame, and a plurality of lifting holes which are arranged at equal intervals and linearly arrayed in the length direction of the lifting appliance frame are formed in the lower end of the lifting appliance frame; the outer side lifting hooks are arranged in the lifting holes in the outermost end, and the middle lifting hooks are arranged in the lifting holes in the middle area; the first lifting rope is used for being connected with a lifting machine, and the two ends of the first lifting rope are connected to the two lifting lugs respectively; the two ends of the second lifting rope are connected to the two outer side lifting hooks respectively, and the middle section of the second lifting rope penetrates through the multiple middle lifting hooks; according to the self-balancing lifting appliance device, balance can be automatically achieved in the lifting process according to the self weight of the laminated slab, manual adjustment is not needed, so that the lifting efficiency is improved, flexible adjustment can be conducted according to the size of the laminated slab through the multiple lifting holes at equal intervals, and the self-balancing lifting appliance device is suitable for laminated slabs of different sizes.

Description

Technical Field

[0001] The present invention relates to the technical field of hoisting equipment, and particularly relates to a self-balancing sling device and a using method based on the self-weight of PK3 type composite slabs. Background Art

[0002] The prestressed concrete composite slab with steel pipe truss (hereinafter referred to as PK3 type composite slab) is a pre-tensioned prestressed concrete precast floor slab using "grouted steel pipe truss" as the stiffening rib. After being assembled on the construction site, steel bars are then arranged on the precast floor slab, and concrete is cast on site to form a composite floor slab. Compared with traditional floor slabs, the PK3 type composite slab has the following advantages:

[0003] 1. Thanks to the application of pre-tensioned prestressed steel bars, the PK3 type composite slab is not prone to cracking, greatly improving the stiffness and crack resistance of the floor slab, enabling the floor slab to be designed thinner, thus saving material costs and reducing the overall weight of the building.

[0004] 2. The K3 type composite slab can be precast in the factory, and the installation process is simple and fast, significantly shortening the construction period and improving the construction efficiency.

[0005] 3. The PK3 type composite slab requires less support during the construction process, simplifying the layout of the construction site.

[0006] To sum up, the PK3 type composite slab has various characteristics, but in actual construction, how to hoist the PK3 type composite slab has become a major problem. If the PK3 type composite slab tilts during hoisting, it may lead to deviation of the hoisting position, and even cause irreversible damage to the collision between the composite slab and the building, thereby affecting the construction progress and cost. At the same time, it is difficult to achieve perfect coordination among the portability, adjustability and self-balancing function of the existing slings. Summary of the Invention

[0007] Aiming at the deficiencies in the prior art, the purpose of the present invention is to propose a self-balancing sling device and a using method based on the self-weight of PK3 type composite slabs to solve the problems mentioned in the above background art section.

[0008] The present invention is realized through the following technical solutions:

[0009] A self-balancing sling device based on the self-weight of PK laminated plates, comprising a sling frame. At the upper end of the sling frame, two lifting lugs are symmetrically arranged along its center of gravity. At the lower end of the sling frame, a plurality of equally spaced lifting holes are linearly arrayed along its length direction. It further includes outer hooks arranged outside the outermost lifting holes and middle hooks arranged in the middle area of the lifting holes. It also includes a first lifting rope for connecting a crane, with both ends of the first lifting rope respectively connected to the two lifting lugs. It further includes a second lifting rope, with both ends of the second lifting rope respectively connected to the two outer hooks, and the middle section of the second lifting rope passes through several middle hooks. It also includes a third lifting rope, with a buckle provided at the upper end of the third lifting rope and a lifting member for hoisting the laminated plate provided at the lower end of the third lifting rope. A plurality of the third lifting ropes are slidably connected to the second lifting rope through the buckle and are distributed between the outer hooks and the middle hooks, as well as between two adjacent middle hooks.

[0010] Further, it also includes distance sensors and a processor arranged at both ends in the length direction of the sling frame. The distance sensors emit distance detection signals towards the laminated plate and transmit the detected distances to the processor. When the processor identifies that the difference in the detected distances exceeds a set threshold, the processor issues an alarm signal or controls the crane to stop working.

[0011] Further, the buckle includes a mounting plate and a hanging plate fixedly connected to the mounting plate. The hanging plate is used to connect with the second lifting rope. The mounting plate includes two vertically arranged plates spaced apart and a horizontal plate connecting the two vertically arranged plates. A sliding seat is sleeved outside the horizontal plate. The sliding seat is provided with a recess for the third lifting rope to be embedded. Two pressure sensors are symmetrically arranged on both sides of the sliding seat. The detection ends of the two pressure sensors respectively abut against the two side end faces of the sliding seat. The pressure sensors are electrically connected to the processor. When the detected pressure value of one of the pressure sensors exceeds a set threshold, the processor issues an alarm signal or controls the crane to stop working.

[0012] Further, it also includes micro electric telescopic rods. The output ends of the two micro electric telescopic rods are respectively connected to the two pressure sensors. The micro electric telescopic rods are respectively electrically connected to the processor and the pressure sensors.

[0013] Further, the distance sensor is a transceiver integrated infrared sensor.

[0014] Further, the hanging plate is provided with a rolling sleeve for connecting with the second lifting rope.

[0015] Further, the number of adjacent third lifting ropes is greater than or equal to three, and each of the third lifting ropes is equally spaced.

[0016] Further, the sling frame is a long I-beam.

[0017] Further, the second sling and the third sling are steel wires, and the surfaces of the steel wires are treated by a smoothing process.

[0018] On the other hand, the present invention provides a method for using a sling device. The structure of the sling device is a self-balancing sling device based on the dead weight of a PK3 type laminated slab as described above. Its control method includes the following steps:

[0019] S1. Connect and fix the first sling to the sling ears of the sling frame, and the hoist slowly lifts the first sling to lift the sling frame to an appropriate height above the ground.

[0020] S2. Connect the two ends of the second sling to the outer hooks, pass the middle section of the second sling through the middle hook, and select appropriate equally spaced hanging holes to connect the outer hook and the middle hook to the hanging holes of the sling frame.

[0021] S3. A number of third slings are slidably connected to the second sling through buckles, and are distributed between the outer hook and the middle hook, and between two adjacent middle hooks. Among them, the second sling and the third sling are symmetrically arranged with respect to the center of gravity of the sling frame.

[0022] S4. Connect and fix the hanging members of the third slings to the laminated slab, and the hoist slowly lifts the first sling again to lift the laminated slab to an appropriate height above the ground, and continue to lift after the laminated slab is balanced.

[0023] The beneficial effects of the present invention are as follows: A self-balancing sling device based on the dead weight of a PK type laminated slab includes a sling frame. Two sling ears are symmetrically arranged at the upper end of the sling frame along its center of gravity. A plurality of equally spaced hanging holes are linearly arranged along the length direction at the lower end of the sling frame; it also includes outer hooks arranged at the outermost hanging holes, and middle hooks arranged in the middle area of the hanging holes; it also includes a first sling for connecting the hoist, and the two ends of the first sling are respectively connected to the two sling ears; it also includes a second sling, and the two ends of the second sling are respectively connected to the two outer hooks, and the middle section of the second sling passes through a number of the middle hooks; it also includes a third sling, a buckle is provided at the upper end of the third sling, a hanging member for hoisting the laminated slab is provided at the lower end of the third sling, and a number of the third slings are slidably connected to the second sling through the buckle, and are distributed between the outer hook and the middle hook, and between two adjacent middle hooks. The self-balancing sling device of the present invention can automatically achieve balance during the hoisting and lifting process according to the dead weight of the laminated slab, without manual adjustment, thereby improving the efficiency of the hoisting operation, and through a plurality of equally spaced hanging holes, it can be flexibly adjusted according to the size of the laminated slab, and is applicable to laminated slabs of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is the front view of the present invention.

[0025] Figure 2 This is the side view of the present invention.

[0026] Figure 3 This is a schematic diagram of the connection relationship of the pressure sensor and its related components of the present invention.

[0027] Among them, the above-mentioned drawings include the following reference numerals:

[0028] 1. Suspension frame; 11. Suspension ear; 12. Suspension hole; 2. Outer hook; 3. Intermediate hook; 4. First lifting rope; 5. Second lifting rope; 6. Third lifting rope; 61. Lock; 611. Mounting plate; 6111. Vertical plate; 6112. Horizontal plate; 612. Hanging piece; 6121. Rolling sleeve; 613. Sliding seat; 6131. Concave part; 6132. Ball; 614. Pressure sensor; 615. Micro electric telescopic rod; 62. Lifting piece; 7. Distance sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It should be noted here that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation to the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] Refer to Figures 1 to 3 As shown, a self-balancing sling device based on the self-weight of PK3 type laminated plates includes a sling frame 1. Two suspension ears 11 are symmetrically arranged at the upper end of the sling frame 1 along its center of gravity. A plurality of equally spaced suspension holes 12 are linearly arranged along the length direction at the lower end of the sling frame 1. It also includes an outer hook 2 arranged at the outer side of the outermost suspension hole 12, and an intermediate hook 3 arranged in the middle area of the suspension holes 12. It further includes a first lifting rope 4 for connecting a hoist (not shown in the figure). The two ends of the first lifting rope 4 are respectively connected to the two suspension ears 11. It also includes a second lifting rope 5. The two ends of the second lifting rope 5 are respectively connected to the two outer hooks 2, and the middle section of the second lifting rope 5 passes through several intermediate hooks 3. It also includes a third lifting rope 6. A lock 61 is provided at the upper end of the third lifting rope 6, and a lifting piece 62 for hoisting a laminated plate (not shown in the figure) is provided at the lower end of the third lifting rope 6. A plurality of third lifting ropes 6 are slidably connected to the second lifting rope 5 through the lock 61, and are distributed between the outer hook 2 and the intermediate hook 3, and between two adjacent intermediate hooks 3.

[0031] Specifically, the lower end of the third lifting rope 6 is used to hoist the laminated slab through the lifting member 62. Refer to Figure 1 As shown, the lifting member 62 can be in the shape of a hook, and the laminated slab is provided with a hook hole that cooperates with the hook-shaped part. Under the action of gravity, the locking catches 61 on both sides slide to the center points of the adjacent outer hooks 2 and the middle hook 3, and the middle locking catch 61 slides to the center points of two adjacent middle hooks 3. Through the self-weight of the laminated slab, balance is automatically achieved during the hoisting and lifting process without manual adjustment, thus improving the efficiency of the hoisting operation. Moreover, through multiple equally spaced lifting holes 12, it can be flexibly adjusted according to the size of the laminated slab, and is applicable to laminated slabs of different sizes. As another embodiment, the lifting member 62 of the third lifting rope 6 can be a rope-shaped strap that is tied to the laminated slab.

[0032] Refer to Figure 1 and Figure 2 As shown, the lifting tool frame 1 is a long I-beam. When hoisting a laminated slab, two sets or more sets of the self-balancing lifting tool devices provided by the present invention can be used for cooperative hoisting, and the lifting members 62 of the two sets of self-balancing lifting tool devices are respectively hoisted on both sides of the laminated slab to maintain balance. Compared with other rectangular lifting tool frames 1, the lifting tool frame 1 of the present invention is a long I-beam, which is more convenient for the storage and transportation of the self-balancing lifting tool device.

[0033] The number of adjacent third lifting ropes 6 is greater than or equal to three, and each of the third lifting ropes 6 is equally spaced. When the lengths of the third lifting ropes 6 are the same, the lower ends can be guaranteed to be flush, so as to ensure the balance of the hoisting of the laminated slab.

[0034] The second lifting rope 5 and the third lifting rope 6 are steel wires, and the surface of the steel wire is treated by a smooth process. The smooth process treatment includes spraying treatment or electroplating treatment on the surface of the steel wire. Spraying treatment: The coating is evenly sprayed on the surface of the steel wire to form a protective film, which can not only improve the corrosion resistance and aesthetics of the steel wire, but also make the surface smoother. Electroplating treatment: A wear-resistant metal or alloy, such as a hard chromium coating, a nickel-based wear-resistant composite coating, etc., is plated on the surface of the lifting rope. The smooth process treatment of the surface of the steel wire helps to reduce friction, so that the locking catch 61 can automatically adjust to the balanced state more quickly under the action of gravity.

[0035] In order to avoid problems such as the laminated slab tilting during hoisting, with one side high and the other side low, resulting in deviation of the hoisting position, and even the risk of falling easily, the present invention also monitors the tilting movement of the laminated slab through the following structure.

[0036] Specifically, it further includes distance sensors 7 and a processor provided at both ends of the sling frame 1 in the length direction. The distance sensors 7 emit distance detection signals towards the laminated board and transmit the detected distances to the processor. When the processor recognizes that the difference in the detected distances exceeds a set threshold, the processor emits an alarm signal or controls the hoisting machine to stop working.

[0037] During use, the detection distances of the two distance sensors 7 for the laminated board are D1 and D2 respectively. When the difference between D1 and D2 exceeds the set threshold, which is related to the length of the laminated board being hoisted and is not limited here, it indicates that the laminated board has a tilting movement with one side high and the other side low. At this time, an alarm signal is emitted through the processor or the hoisting machine is controlled to stop working, and then manual intervention is used for adjustment to achieve leveling of the laminated board.

[0038] As a preferred embodiment, the distance sensor 7 is an infrared sensor with integrated transceiver, which is convenient for installation and use. The distance sensor 7 can slide along the length direction of the sling frame 1 to adapt to laminated boards of different lengths.

[0039] In order to avoid problems such as the laminated board shaking and floating too much due to, for example, the influence of wind or the lateral swing of the hoisting arm of the hoisting machine during transportation, resulting in serious lateral deviation of the laminated board during hoisting and deviation of the hoisting position, the present invention also detects the lateral deviation movement of the laminated board through the following structure.

[0040] Refer to Figure 3 As shown, specifically, the buckle 61 includes a mounting piece 611 and a hanging piece 612 fixedly connected to the mounting piece 611. The hanging piece 612 is used to connect to the second lifting rope 5. The mounting piece 611 includes two vertically arranged plates 6111 arranged at intervals and a horizontal plate 6112 connecting the two vertically arranged plates 6111. A sliding seat 613 is sleeved outside the horizontal plate 6112. The sliding seat 613 is provided with a recess 6131 for the third lifting rope 6 to be embedded. Two pressure sensors 614 are symmetrically arranged on both sides of the sliding seat 613. The detection ends of the two pressure sensors 614 respectively abut against the two side end faces of the sliding seat 613. The pressure sensors 614 are electrically connected to the processor. When the detected pressure value of one of the pressure sensors 614 exceeds the set threshold, the processor emits an alarm signal or controls the hoisting machine to stop working.

[0041] Preferably, the hanging piece 612 is provided with a rolling sleeve 6121 for connecting to the second lifting rope 5, so as to reduce the friction between the second lifting rope 5 and the hanging piece 612 and reduce the wear on the second lifting rope 5.

[0042] During use, when the laminated board deviates towards one side, it will drive the sliding seat 613 to slide on the cross plate 6112 and press the pressure sensor 614. When the detected pressure value of one of the pressure sensors 614 exceeds the set threshold value, which is related to the length, weight, etc. of the lifted laminated board and is not limited here, the processor issues an alarm signal or controls the hoist to stop working. Then, after waiting for the shaking of the laminated board to stop, that is, when the pressure value of the pressure sensor 614 returns to zero, the hoist continues to perform the lifting work. Among them, a plurality of balls 6132 that abut against the cross plate 6112 are provided on the inner circumference of the sliding seat 613, so as to facilitate the slidable connection between the sliding seat 613 and the cross plate 6112.

[0043] It further includes a micro electric telescopic rod 615. The output ends of the two micro electric telescopic rods 615 are respectively connected to the two pressure sensors 614. The micro electric telescopic rods 615 are respectively electrically connected to the processor and the pressure sensor 614.

[0044] When the laminated board is lifted to an appropriate height above the ground, about 50 cm, and after the laminated board is balanced, that is, when the detected distances D1 and D2 of the two distance sensors 7 are equal, the processor controls the micro electric telescopic rod 615 to work, and then makes the detection end of the pressure sensor 614 just abut against the sliding seat 613. At this time, the detected pressure value returns to zero, and then the micro electric telescopic rod 615 remains fixed; then continue to lift the laminated board. During the subsequent lifting of the laminated board, when the laminated board deviates, it will drive the sliding seat 613 to move. At this time, it will be recognized by the pressure sensor 614, and then the processor can issue an alarm signal or control the hoist to stop working, so as to prevent accidents or inaccurate lifting positions caused by the deviation of the laminated board.

[0045] On the other hand, the present invention provides a method for using a lifting device. The structure of the lifting device is a self-balancing lifting device based on the dead weight of the PK3 type laminated board as described above. Its control method includes the following steps:

[0046] S1. Connect and fix the first lifting rope 4 to the lifting lug 11 of the lifting frame 1, and the hoist slowly lifts the first lifting rope 4 to lift the lifting frame 1 to an appropriate height above the ground. Preferably, this height is 0.5 meters;

[0047] S2. Connect the two ends of the second lifting rope 5 to the outer hook 2, pass the middle section of the second lifting rope 5 through the middle hook 3, and select appropriate equally spaced lifting holes 12 to connect the outer hook 2 and the middle hook 3 to the lifting holes 12 of the lifting frame 1;

[0048] S3. A number of third suspension ropes 6 are slidably connected to the second suspension rope 5 through buckle 61, and are distributed between the outer hook 2 and the middle hook 3, as well as between two adjacent middle hooks 3. Among them, the second suspension rope 5 and the third suspension rope 6 are symmetrically arranged with respect to the center of gravity of the spreader frame 1, so as to avoid the laminated slab tilting to one side during hoisting;

[0049] S4. Connect and fix the lifting member 62 of the third suspension rope 6 to the laminated slab. The hoisting machine slowly lifts the first suspension rope 4 again, lifts the laminated slab to an appropriate height above the ground, and continues to hoist after the laminated slab is balanced.

[0050] Among them, step S4 further includes the following steps:

[0051] S401. After lifting the laminated slab to an appropriate height above the ground, preferably about 50 cm, then start two distance sensors 7, and the two distance sensors 7 emit distance detection signals to the laminated slab;

[0052] S402. After the distance detection values emitted by the two distance sensors 7 to the laminated slab are equal, start the micro electric telescopic rod 615. The micro electric telescopic rod 615 moves through the mobile pressure sensor 614 until the pressure detection value of the pressure sensor 614 returns to zero;

[0053] S402. After the pressure detection values of the two pressure sensors 614 return to zero, the processor controls the hoisting machine to continue to slowly lift the first suspension rope 4, and continues to hoist after the laminated slab is balanced.

[0054] During the movement of continuing to hoist after the laminated slab is balanced, the offset movement and tilt movement of the laminated slab are detected in real time through the two distance sensors 7 and the two pressure sensors 614.

[0055] In summary, from the operational level, the spreader device of the present invention demonstrates its convenient operation characteristics. Construction workers only need to follow the established operation steps and gradually adjust the height and position of the suspension ropes to achieve the stable hoisting and movement of the laminated slab. This operation method not only greatly reduces the construction difficulty but also significantly improves the work efficiency.

[0056] In addition, during hoisting and movement, excessive offset and swing of the laminated slab can be accurately identified by the pressure sensor 614 and the distance sensor 7, preventing special accidents from occurring during the hoisting process of the laminated slab and ensuring the accuracy of the hoisting position.

[0057] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0058] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0059] The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A self-balancing sling device based on the deadweight of a PK3 type composite plate, characterized in that: It comprises a sling frame (1), wherein the upper end of the sling frame (1) is symmetrically provided with two lifting ears (11) along its center of gravity, and the lower end of the sling frame (1) is provided with a plurality of equally spaced lifting holes (12) in a linear array along its length direction; It also includes an outer hook (2) arranged at the outermost hanging hole (12), and a middle hook (3) arranged at the hanging hole (12) in the middle area; It also comprises a first lifting rope (4) for connecting to the hoist, wherein two ends of the first lifting rope (4) are respectively connected to the two lifting ears (11); It also comprises a second lifting rope (5), the two ends of which are respectively connected to the two outer lifting hooks (2), and a plurality of the middle lifting hooks (3) are passed through the middle section of the second lifting rope (5); It also includes a third lifting rope (6), the upper end of which is provided with a lock buckle (61), and the lower end of which is provided with a hanging piece (62) for hanging the composite plate. A plurality of the third lifting ropes (6) are slidably connected to the second lifting rope (5) through the lock buckle (61), and are distributed between the outer hook (2) and the middle hook (3), and between two adjacent middle hooks (3).

2. A self-balancing sling device based on the deadweight of a PK3 type composite plate according to claim 1, characterized in that: It also includes distance sensors (7) and a processor arranged at both ends of the length direction of the sling frame (1), wherein the distance sensor (7) emits a distance detection signal toward the stacking plate and transmits the detected distance to the processor, and when the processor recognizes that the difference in the detected distance exceeds a set threshold, the processor sends an alarm signal or controls the crane to stop working.

3. A self-balancing sling device based on the deadweight of a PK3 type composite plate according to claim 2, characterized in that: The lock buckle (61) comprises a mounting plate (611), a hanging plate (612) fixedly connected to the mounting plate (611), the hanging plate (612) being used to connect with the second lifting rope (5), the mounting plate (611) comprising two vertical plates (6111) arranged at intervals, a horizontal plate (6112) connecting the two vertical plates (6111), a sliding seat (613) being sleeved on the outside of the horizontal plate (6112), the sliding seat (613) being provided with a recessed portion (6131) for embedding the third lifting rope (6), two pressure sensors (614) being symmetrically arranged on both sides of the sliding seat (613), the detection ends of the two pressure sensors (614) respectively abutting against the end surfaces of both sides of the sliding seat (613), the pressure sensors (614) being electrically connected to the processor, and when the detection pressure value of one of the pressure sensors (614) exceeds a set threshold, the processor sends out an alarm signal or controls the crane to stop working.

4. A self-balancing sling device based on the deadweight of a PK3 type composite plate according to claim 3, characterized in that: It also includes a micro electric telescopic rod (615), the output ends of the two micro electric telescopic rods (615) are respectively connected to the two pressure sensors (614), and the micro electric telescopic rods (615) are respectively electrically connected to the processor and the pressure sensor (614).

5. A self-balancing sling device based on the deadweight of a PK3 type composite plate according to claim 2, characterized in that: The distance sensor (7) is an infrared sensor with both transmitting and receiving functions.

6. A self-balancing sling device based on the deadweight of a PK3 type composite plate according to claim 3, characterized in that: The hanging piece (612) is provided with a rolling sleeve (6121) connected to the second suspension rope (5).

7. A self-balancing sling device based on the deadweight of a PK3 type composite plate according to any one of claims 1 to 6, characterized in that: The number of adjacent third suspension ropes (6) is greater than or equal to three, and the third suspension ropes (6) are distributed at equal intervals.

8. A self-balancing sling device based on the deadweight of a PK3 type composite plate according to any one of claims 1 to 6, characterized in that: The second suspension rope (5) and the third suspension rope (6) are steel wire ropes, and the surfaces of the steel wire ropes are treated with a smoothing process.

9. A self-balancing sling device based on the deadweight of a PK3 type composite plate according to any one of claims 1 to 6, characterized in that: The sling frame (1) is a long I-beam.

10. A method for using a sling device, characterized in that: The structure of the sling device is a self-balancing sling device based on the deadweight of a PK3 type composite plate as described in claim 1, and the control method thereof comprises the following steps: S1, connecting and fixing the first lifting rope (4) to the lifting lug (11) of the lifting device frame (1), and slowly lifting the first lifting rope (4) with a crane to lift the lifting device frame (1) to an appropriate height above the ground; S2, by connecting the two ends of the second lifting rope (5) to the outer hooks (2), passing the middle hook (3) through the middle section of the second lifting rope (5), selecting appropriate equidistant lifting holes (12), and connecting the outer hooks (2) and the middle hooks (3) to the lifting holes (12) of the lifting device frame (1); S3, a plurality of third lifting ropes (6) are slidably connected to the second lifting rope (5) through a lock buckle (61), and are distributed between the outer lifting hook (2) and the middle lifting hook (3), and between two adjacent middle lifting hooks (3), wherein the second lifting rope (5) and the third lifting rope (6) are symmetrically arranged relative to the center of gravity of the lifting device frame (1); S4. Connect and fix the hanging piece (62) of the third hanging rope (6) to the composite plate, and the crane slowly lifts the first hanging rope (4) again to lift the composite plate to a suitable height above the ground, and continue lifting after the composite plate is balanced.

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