LU501213B1

LU501213B1 - Multi-rope anti-swing device for cranes

Info

Publication number: LU501213B1
Application number: LU501213A
Authority: LU
Inventors: Zhen Zhang; Manman Xu
Original assignee: Univ Anhui Polytechnic; Univ Anhui Sci & Technology
Priority date: 2022-01-06
Filing date: 2022-01-06
Publication date: 2022-07-06

Abstract

The invention relates to a multi-rope anti-swing device for cranes, which comprises a crane arm and a lifting sling arranged on the crane arm, wherein the bottom of the lifting sling is connected with a hook with buffering function, constraint frames for preventing the rope from twisting is arranged above the hook, anti-swing arms are symmetrically arranged on both sides of the front end of the crane arm, and the lifting sling is correspondingly provided with anti-swing slings which passes through the crane arm, the anti-swing arms and the constraint frames and is connected with the hook to prevent the hook from swinging. When the heavy object swings in one direction, the anti-swing ropes will give the sling an opposite acting force to prevent the sling from swinging, and the heavy object can only swing through the universal coupling in the middle of the hook.

Description

DESCRIPTION LUs01213 Multi-rope anti-swing device for cranes

TECHNICAL FIELD The invention relates to the technical field of cranes, in particular to a multi-rope anti-swing device for cranes.

BACKGROUND At present, most cranes use ropes to connect hooks through pulleys, and motors control ropes to lift and fall heavy objects. However, due to the underactuated characteristics of the crane system, even if there is no external interference, when carrying out luffing, slewing and other operations, lifting will inevitably lead to swing, which not only greatly reduces the work efficiency, but also may cause it to collide with other objects or people around it and other dangerous situations.

The existing anti-swing method of crane sling is rigid guide bar anti-swing device, which forcibly stabilizes the ground sling through rigid guide frame. Although the anti-swing performance is good, the self-weight increases and the cost of the equipment itself increases due to the addition of rigid guide frame, and it is uneconomical. Therefore, the anti-swing of cranes has always been a major problem in engineering practice, and it is urgent to find a crane anti-swing device with simple structure, safety and reliability, which can improve work efficiency.

SUMMARY In order to solve the above technical problems, the invention provides a multi-rope anti-swing device for cranes.

The technical problems to be solved by the invention are realized by adopting the following technical scheme: A multi-rope anti-swing device for cranes comprises a crane arm and a lifting sling arranged on the crane arm, wherein the bottom of the lifting sling is connected with a hook with buffering function, restraint frames for preventing the ropes from twisting is arranged above the hook, anti-swing arms are symmetrically arranged on both sides of the front end of the crane arm, and the lifting sling is correspondingly provided with anti-swing slings which pass through the crane arm, the anti-swing arms and the restraint frames and is connected with (0901213 the hook to prevent the hook from swinging.

Further, the hook comprises an upper hook plate and a lower hook plate which are mutually connected through a universal coupling, and damping spring shock absorbers are distributed between the upper hook plate and the lower hook plate.

Furthermore, the upper hook plate is evenly distributed with small lifting lugs connected with anti-swing slings for directional pre-tightening to play an anti-swing role along the circumference.

Furthermore, the restraint frames comprise a first restraint frame and a second restraint frame which are mutually connected by a diagonal plate, and the ends of the first restraint frame and the second restraint frame are both provided with small pulleys for matching with anti-swing ropes.

Furthermore, the symmetrical end of the first restraint frame is symmetrically provided with restraint lugs connected with the crane arm through suspension ropes.

Further, the anti-swing arms comprise elongated walls symmetrically arranged at both sides of the front end of the crane arm and pulleys arranged at the ends of the elongated walls.

Further, the anti-swing slings include No.1 anti-swing sling, No.2 anti-swing sling which pass through the crane arm and the restraint frames and are connected with the hook, No.3 anti-swing sling and No.4 anti-swing sling which pass through the anti-swing arms and the restraint frames and are connected with the hook.

The invention has the beneficial effects that: during the working process of the device, with the lifting of the sling, the anti-swing motor always gives a tension to the anti-swing slings. When the heavy object swings in one direction, the anti-swing ropes give the sling an opposite acting force to prevent the sling from swinging, and the heavy object can only swing through the universal coupling in the middle of the hooks. At this time, four damping spring shock absorbers evenly distributed between the hooks play a buffering role, which makes the heavy object in a stable state, can effectively prevent the swinging of the heavy objects and improve the working efficiency, and has a simple structure.

BRIEF DESCRIPTION OF THE FIGURES LUs01213 The present invention will be further explained with reference to the following drawings and embodiments.

Fig. 1 is a schematic diagram of the overall structure of the present invention; Fig. 2 is a schematic view of the structure of the restraint frames in the present invention; Fig. 3 is a schematic diagram of the hook structure of the present invention; Fig. 4 is a schematic diagram of the anti-swing arms structure of the present invention.

DESCRIPTION OF THE INVENTION In order to make the technical means, creative features, achievement purpose and efficacy of the present invention easy to understand, the present invention will be further explained below with reference to the drawings and embodiments.

As shown in Fig. 1, the multi-rope anti-swing device for cranes includes the crane arm 4, the lifting sling 7 arranged on the crane arm 4, a hook 3 connected to the bottom of the lifting sling 7, big pulleys 15 symmetrically arranged on both sides of the middle end of the crane arm 4, which are fixed on the side wall of the crane arm 4 through bosses 14, and the lifting lugs 5 of crane arm and the anti-swing arms 1 symmetrically arranged on both sides of the front end of the crane arm 4, wherein the lifting lugs 5 of crane arm is fixed on the crane arm 4 through the No.1 pin shaft 6. As shown in Fig. 4, the anti-swing arms 1 include the elongated wall 1.1 fixed on a boom 4, and a pulley 1.3 fixed at the end of the elongated wall

1.1 through a second pin shaft 1.2.

The restraint frame 2 is arranged above the hook 3. No.1 anti-swing sling 8 and No.2 anti-swing sling 9 are symmetrically arranged on both sides of the lifting sling 7. No.3 anti-swing sling 10 and No.4 anti-swing sling 11 are symmetrically arranged on both sides of the lifting sling 4 which are connected with the hook 3 through the big pulleys 15, the anti-swing arms 1 and the restraint frame 2.

As shown in Fig. 2, the restraint frame 2 includes the first restraint frames 2.1 located at the top and the second restraint frame 2.2 located at the bottom. Two of the first restraint frames 2.1 are connected in a cross shape, and a circular hole is arranged at the middle joint. The second restraint frame 2.2 has the same structure as the first restraint frames 2.1, and the first restraint frames 2.1 and the second restraint frame 2.2 are connected by two groups of splayed diagonal plates 2.4. The ends of the first restraint frames 2.1 and the second restraint (0901213 frame 2.2 are both provided with grooves in which small pulleys 2.3 are installed, and two restraint lugs 2.5 are symmetrically arranged at both ends of any one of the two first restraint frames 2.1. The two restraint lugs 2.5 are respectively connected with the corresponding two lifting lugs 5 of crane arm through the No.1 suspension rope 12 and No.2 suspension rope 13, which can prevent the No.1 anti-swing sling 8, No.2 anti-swing sling 9, No.3 anti-swing sling and No.4 anti-swing sling 11 from twisting.

As shown in Fig. 3, the hook 3 includes the upper hook plate 3.2. The middle of the upper hook plate 3.2 is provided with a large lifting lug 3.1 connected with a lifting sling 7. Four small lifting lugs 3.3 are evenly distributed on the end face along the circumference. The lower part of the upper hook plate 3.2 is connected with the lower hook plate 3.4 through the universal coupling 3.5. The bottom of the lower hook plate 3.4 is provided with a hook head

3.7 for lifting heavy objects. Between the upper hook plate 3.2 and the lower hook plate 3.4, four damping spring shock absorbers 3.6 with buffering function are evenly distributed along the circumference. The hook plates are all round, and the purpose of this structure is to bear the swing of heavy objects from different directions.

Specifically, one end of the lifting sling 7 is connected with the big lifting lug 3.1 on the hook 3, the other end passes through the circular holes in the middle of the first restraint frames 2.1 and second restraint frame 2.2, and is connected with the lifting motor through the direction change of the pulley on the crane arm 4. One end of the No.1 anti-swing sling 8, No.2 anti-swing sling 9, No.3 anti-swing sling 10 and No.4 anti-swing sling 11 are respectively connected with the four small lifting lugs 3.3 on the hook 3 and passes through four holes with small pulleys 2.3 on the first restraint frames 2.1 and second and restraint frame 2.2, in which the No.1 and No.2 anti-swing slings 8 and 9 are deflected by pulleys on the crane arm 4, and the No.3 and No.4 anti-swing slings 10 and 11 are deflected by pulleys

1.3 in the anti-swing arms 1 and large pulleys 15 on both sides of the crane arm 4, and are connected with the anti-swing motor, which pre-tighten four anti-swing ropes and eliminate the swing of heavy objects during lifting through damping spring shock absorbers 3.6 on the hook.

During the working process of the device, with the lifting of the sling, the anti-swing (0901213 motor always gives a tension to the anti-swing slings. When the heavy object swings in one direction, the anti-swing ropes give the sling an opposite acting force to prevent the sling from swinging, and the heavy object can only swing through the universal coupling in the middle of the hook. At this time, four damping spring shock absorbers evenly distributed between the hooks play a buffering role, which makes the heavy object in a stable state, can effectively prevent the swinging of the heavy object and improve the working efficiency, and has a simple structure.

The above shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the industry should know that the present invention is not limited by the above-mentioned embodiments. What is described in the above-mentioned embodiments and descriptions is only the principle of the present invention. Without departing from the spirit and scope of the present invention, there will be various changes and improvements of the present invention, which all fall within the scope of the claimed invention. The scope of protection claim by the present invention is defined by the append claims and their equivalents.

Claims

CLAIMS LU501213

1. À multi-rope anti-swing device for cranes comprises a crane arm (4) and a lifting sling (7) arranged on the crane arm (4), wherein the bottom of the lifting sling (7) is connected with a hook (3) with buffering function, restraint frames (2) for preventing the ropes from twisting is arranged above the hook (3), anti-swing arms (1) are symmetrically arranged on both sides of the front end of the crane arm (4), and the lifting sling (7) is correspondingly provided with anti-swing slings which pass through the crane arm (4), the anti-swing arms (1) and the restraint frames (2) and is connected with the hook (3) to prevent the hook (3) from swinging.

2. The multi-rope anti-swing device for cranes according to claim 1, characterized in that the hook (3) comprises an upper hook plate (3.2) and a lower hook plate (3.4) which are mutually connected through a universal coupling (3.5), and damping spring shock absorbers are distributed between the upper hook plate (3.2) and the lower hook plate (3.4).

3. The multi-rope anti-swing device for cranes according to claim 2, characterized in that the upper hook plate (3.2) is evenly distributed with small lifting lugs (3.3) connected with anti-swing slings for directional pre-tightening to play an anti-swing role along the circumference.

4. The multi-rope anti-swing device for cranes according to claim 1, characterized in that the restraint frames (2) comprise a first restraint frame (2.1) and a second restraint frame (2.2) which are mutually connected by a diagonal plate (2.4), and the ends of the first restraint frame and the second restraint frame are both provided with small pulleys (2.3) for matching with anti-swing ropes.

5. The multi-rope anti-swing device for cranes according to claim 4, characterized in that the symmetrical end of the first restraint frame is symmetrically provided with restraint lugs (2.5) connected with the crane arm (4) through suspension ropes.

6. The multi-rope anti-swing device for cranes according to claim 1, characterized in that the anti-swing arms (1) comprise elongated walls symmetrically arranged at both sides of the front end of the crane arm (4) and pulleys (1.3) arranged at the ends of the elongated walls.

7. The multi-rope anti-swing device for cranes according to claim 1, characterized in that the anti-swing slings include No.1 anti-swing sling (8) and No.2 anti-swing sling (9) which pass through the crane arm (4) and the restraint frames (2) and are connected with the hook

. . . . . . . LU501213 (3), No.3 anti-swing sling (10) and No.4 anti-swing sling (11) which pass through the anti-swing arms (1) and the restraint frames (2) and are connected with the hook (3).