CN112299259B

CN112299259B - Play to rise wiring system and tower crane

Info

Publication number: CN112299259B
Application number: CN202011130609.2A
Authority: CN
Inventors: 解攀虎; 刘圣平; 冯军; 朱守寨
Original assignee: Hunan Zhonglian Zhongke Construction Hoisting Machinery Co ltd; Zoomlion Heavy Industry Science and Technology Co Ltd
Current assignee: Hunan Zhonglian Zhongke Construction Hoisting Machinery Co ltd; Zoomlion Heavy Industry Science and Technology Co Ltd
Priority date: 2020-10-21
Filing date: 2020-10-21
Publication date: 2022-05-20
Anticipated expiration: 2040-10-21
Also published as: CN112299259A

Abstract

The invention relates to tower crane lifting equipment, and discloses a lifting rope winding system and a tower crane, wherein the lifting rope winding system comprises a lifting rope (13), a rope arranging wheel set (12) arranged on a lifting support (21), a plurality of fixed pulley blocks and a lifting mechanism (11) arranged on a lifting arm (3), and the lifting rope (13) is led out by the lifting mechanism (11) and sequentially wound through the rope arranging wheel set (12) and the fixed pulley blocks; the plurality of fixed pulley blocks comprise a fixed pulley block I (14) for transiting and winding a lifting rope (13) from a lifting support (21) to the crane arm (3), wherein the fixed pulley block I (14) is arranged at an arm root hinge point (33) of the crane arm (3) or is arranged between a first main chord (31) and a second main chord (32) which are opposite to the crane arm (3) and is close to the arm root hinge point (33). The invention ensures that the manufacturing process of the main chord member of the boom root section of the crane boom is simple and the whole stress performance is good.

Description

Play to rise wiring system and tower crane

Technical Field

The invention relates to tower crane hoisting equipment, in particular to a hoisting rope winding system. In addition, the invention also relates to a tower crane.

Background

Tower cranes are hoisting equipment for vertically transporting goods and are widely used in modern industry and civil building construction. The tower crane realizes the lifting action of the hoisted heavy object through the rope winding system of the tower crane.

Fig. 1 is a schematic structural diagram of an existing hoisting roping system, which includes a hoisting mechanism, an a-frame rope-aligning pulley group 1 'mounted on an a-frame, a hoisting steel wire rope 2', and a plurality of crown blocks mounted on a boom 6 ', wherein the hoisting steel wire rope 2' is paid out by a reel of the hoisting mechanism, passes through the a-frame rope-aligning pulley group 1 ', passes through a first crown block 3' mounted on a main chord of an arm root segment of the boom 6 ', is wound into a second crown block 5' mounted with a load-lifting limiter 4 'for measuring a hoisting weight, passes through other crown blocks, and is finally wound through a hook pulley and fixed on an arm knuckle of the boom 6'. However, because the first fixed pulley block 3 'is installed on the arm root section main chord of the crane boom 6', the square tube of the arm root section main chord needs to be changed into double-side channel steel welding, so that the manufacturing process of the arm root section main chord is complex, and the integral stress is poor; in addition, in the amplitude variation process, the length of a lifting steel wire rope 2 'between the A-shaped frame rope arranging pulley group 1' and the first fixed pulley group 3 'is changed greatly, and the influence on the result of the lifting weight measurement of the lifting capacity limiter 4' is large.

Disclosure of Invention

The invention aims to provide a lifting rope winding system, which has the advantages of simple manufacturing process, good integral stress and low manufacturing cost of an arm root section main chord of a crane boom.

The technical problem to be solved by the invention is to provide a tower crane, and the manufacturing process of the main chord member of the arm root section of the cargo boom of the tower crane is simple, the integral stress performance is good, and the manufacturing cost is low.

In order to solve the technical problem, the invention provides a lifting rope winding system, which comprises a lifting rope, a rope winding wheel group, a plurality of fixed pulley blocks for guiding the lifting rope to perform rope winding operation and a lifting mechanism for releasing and winding the lifting rope, wherein the rope winding wheel group is arranged on a lifting support, the lifting mechanism and the lifting support are both arranged on a balance arm, the plurality of fixed pulley blocks are arranged on a lifting arm, and the lifting rope is led out by the lifting mechanism and sequentially wound through the rope winding wheel group and the plurality of fixed pulley blocks; the plurality of fixed pulley blocks comprise a fixed pulley block I which is used for transiting a lifting rope from the lifting support to the cargo boom, and the fixed pulley block I is arranged at an arm root hinge point of the cargo boom, which is used for being hinged with the balance arm, or is arranged between a first main chord and a second main chord opposite to the cargo boom and is close to the arm root hinge point.

Preferably, an arm root web member connected with the arm root hinge point is arranged between the first main chord member and the second main chord member of the cargo boom, and the crown block assembly i is mounted on the arm root web member at a position close to the arm root hinge point.

Preferably, the hoisting roping system further comprises a load limiter mounted on the boom, the hoisting roping passing through the mounting location of the load limiter and being capable of transmitting its force to the load limiter.

Preferably, the plurality of fixed pulley blocks further comprise a fixed pulley block II, a fixed pulley block III and an arm tip fixed pulley block, and the lifting rope sequentially passes through the rope arranging wheel block, the fixed pulley block I, the fixed pulley block II and the fixed pulley block III and penetrates out of the arm tip fixed pulley block.

Preferably, the lifting capacity limiter is connected with the fixed pulley block II, and the lifting rope sequentially passes through the bottom of the fixed pulley block I, the bottom of the fixed pulley block II and the top of the fixed pulley block III and penetrates out of the top of the arm tip fixed pulley block.

Preferably, the fixed pulley block ii is mounted on a connecting plate, one end of the connecting plate is hinged to the second main chord of the crane boom, the other end of the connecting plate is connected to a bearing end of the load limiter, and a mounting end of the load limiter is mounted on the second main chord of the crane boom.

Preferably, be equipped with load lifting limiter pulley on the load lifting limiter, load lifting limiter pulley is located fixed pulley group II with between the fixed pulley group III, rise to rise the rope and wind through in proper order fixed pulley group I, fixed pulley group II, load lifting limiter pulley, fixed pulley group III and warp the arm point fixed pulley group is worn out.

Preferably, the load limiter pulley is attached to a load bearing end of the load limiter, and a mounting end of the load limiter is mounted on the second main chord of the boom; and the fixed pulley block II is arranged in the arm root section of the cargo boom and is close to the position of the first main chord of the cargo boom.

Preferably, the fixed pulley block iii is installed in an arm section of the boom and is close to the position of the first main chord of the boom, the arm tip fixed pulley block is installed on an outer bottom surface of an arm tip section of the boom, and the lifting rope passes through the top of the arm tip fixed pulley block, passes through the hook pulley, and is finally fixed on the anti-twisting device of the arm tip section of the boom.

Preferably, hoisting mechanism includes motor, speed reducer, shaft coupling, reel and stroke limiter, the motor passes through the shaft coupling with the speed reducer links to each other, the pivot is connected to the output of speed reducer, be equipped with in the pivot the reel, play to rise the rope winding on the reel, pivot one end is equipped with the stroke limiter.

Preferably, the lifting support is an a-frame.

The invention also provides a tower crane which comprises the hoisting rope winding system.

According to the invention, the fixed pulley block I is arranged at the arm root hinge point of the crane boom, or is arranged between the first main chord and the second main chord opposite to the crane boom and is close to the position of the arm root hinge point, so that the square tube of the arm root section main chord does not need to be changed into bilateral channel steel welding, the manufacturing process of the arm root section main chord is simple, the integral stress is good, and the manufacturing cost can be reduced.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

Fig. 1 is a schematic structural view of a prior art hoisting roping system;

FIG. 2 is a schematic structural view of one embodiment of a hoist roping system of the present invention;

FIG. 3 is an enlarged schematic view of the structure at A in FIG. 2;

FIG. 4 is an enlarged view of the structure at B in FIG. 2;

FIG. 5 is a schematic structural view of another embodiment of a hoist roping system of the present invention;

FIG. 6 is an enlarged view of the structure at C in FIG. 5;

fig. 7 is an enlarged schematic view of the structure at D in fig. 5.

Description of the reference numerals

1 'A-shaped frame rope-arranging wheel group 2' lifting steel wire rope

3 'first fixed pulley block 4' lifting capacity limiter

5 'second fixed pulley block 6' cargo boom

11 hoisting mechanism 111 motor

112 shaft coupling 113 speed reducer

114 reel 12 rope-arranging wheel set

13 lifting rope 14 fixed pulley block I

15 load lifting limiter 151 load lifting limiter pulley

16 fixed pulley group II 161 connecting plate

17 III 18 arm point fixed pulley block of fixed pulley block

19 balance arm of hook pulley 2

21 lifting support 3 boom

31 first main chord 32 second main chord

33 arm root hinge point and 34 arm root web member

Detailed Description

In the description of the present invention, it is to be understood that the terms "top," "bottom," and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown when the boom 3 is in a horizontal position, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

The invention provides a lifting rope winding system, which comprises a lifting rope 13, a rope winding wheel group 12, a plurality of fixed pulley blocks for guiding the lifting rope 13 to carry out rope winding operation and a lifting mechanism 11 for unwinding and winding the lifting rope 13, wherein the rope winding wheel group 12 is arranged on a lifting support 21, the lifting support 21 is an A-shaped frame, the lifting mechanism 11 and the lifting support 21 are both arranged on a balance arm 2, the plurality of fixed pulley blocks are arranged on a crane boom 3, and the lifting rope 13 is led out from the lifting mechanism 11 and sequentially wound through the rope winding wheel group 12 and the plurality of fixed pulley blocks; the plurality of fixed pulley blocks comprise a fixed pulley block I14 for transiting a lifting rope 13 from the lifting support 21 to the lifting arm 3, wherein the fixed pulley block I14 is installed at an arm root hinge point 33 of the lifting arm 3 for hinging with the balance arm 2 or is installed between a first main chord 31 and a second main chord 32 opposite to the lifting arm 3 and close to the arm root hinge point 33.

According to the invention, the fixed pulley block I14 is arranged at the arm root hinge point 33 of the crane arm 3, or is arranged between the first main chord 31 and the second main chord 32 which are opposite to the crane arm 3 and is close to the arm root hinge point 33, so that the square tube of the arm root section main chord does not need to be changed into double-side channel steel welding, the manufacturing process of the arm root section main chord is simple, the integral stress is good, and the manufacturing cost can be reduced.

Specifically, the plurality of fixed pulley blocks further comprise a fixed pulley block II 16, a fixed pulley block III 17 and an arm tip fixed pulley block 18, and the lifting rope 13 sequentially passes through the rope guide wheel group 12, the fixed pulley block I14, the fixed pulley block II 16, the fixed pulley block III 17 and penetrates out of the arm tip fixed pulley block 18. The rope arranging wheel group 12 is used for preventing the lifting rope 13 from interfering with other components on the tower crane and improving the rope arranging effect of the lifting rope 13 on the lifting mechanism 11; the arm tip fixed pulley block 18 is arranged on the outer bottom surface of an arm tip section of the crane boom 3, and the lifting rope 13 penetrates through the top of the arm tip fixed pulley block 18, winds around the hook pulley 19 and is finally fixed on the torsion-proof device of the arm tip section of the crane boom 3. The fixed pulley blocks III 17 are respectively arranged in each arm section of the crane boom 3 and mainly play roles of supporting ropes and transition, namely, the lifting ropes 13 can smoothly reach arm tip fixed pulley blocks 18 at arm tips from arm roots of the crane boom 3.

In particular, the hoisting roping system of the invention also comprises a load limiter 15 mounted on the jib 3, the hoisting ropes 13 passing the mounting position of the load limiter 15 and being able to transmit their force to the load limiter 15. The lifting weight limiter 15 is used for detecting the weight of a lifted heavy object, and the lifting rope 13 directly lifts the heavy object, so that the weight of the lifted heavy object can be measured by transmitting the stress of the lifting rope 13 to the lifting weight limiter 15 and detecting the stress of the lifting rope 13. The existing hoisting rope winding system is used for transitionally winding a hoisting steel wire rope 2 'from an A-shaped frame to a first fixed pulley block 3' on a hoisting arm 6 'and is arranged on a main chord of an arm root section of the hoisting arm 6', so that in the process of amplitude variation, the length of the hoisting steel wire rope 2 'between the A-shaped frame rope winding pulley block 1' and the first fixed pulley block 3 'is greatly changed, the measurement of a hoisting capacity limiter 4' on the weight of a hoisted heavy object is influenced, the measurement result is inaccurate, the hoisting capacity is possibly overloaded, once the hoisting capacity is overloaded, the tower crane can have accidents, the structure or the mechanism of the tower crane is damaged lightly, the tower crane can be toppled over seriously, and great potential safety hazards can be generated. In the hoisting rope winding system, the fixed pulley block I14 is arranged at an arm root hinge point 33 of the crane arm 3, as shown in fig. 2 and 3, or is arranged between a first main chord 31 and a second main chord 32 which are opposite to the crane arm 3 and is close to the arm root hinge point 33, as shown in fig. 5 and 6, as shown in fig. 2 and 5, in the process of amplitude variation, the length of the hoisting rope 13 between the rope arranging wheel set 12 and the fixed pulley block I14 is unchanged or slightly changed, so that the measurement result of the hoisting capacity limiter 15 on the weight of the hoisted heavy object is more accurate, the occurrence of tower crane accidents can be effectively avoided, and the safe operation of the tower crane is ensured. As shown in fig. 5 and 6, an arm root web member 34 connected to an arm root hinge point 33 is provided between the first main chord member 31 and the second main chord member 32 of the jib 3, and the crown block i 14 is mounted on the arm root web member 34 at a position close to the arm root hinge point 33.

The above-mentioned load limiter 15 can be installed on the crane boom 3 in various ways, as a specific installation way, the load limiter 15 is connected with the fixed pulley block ii 16, and the lifting rope 13 sequentially passes through the bottom of the fixed pulley block i 14, the bottom of the fixed pulley block ii 16, the top of the fixed pulley block iii 17 and passes through the top of the arm tip fixed pulley block 18. By connecting the lifting weight limiter 15 and the fixed pulley block II 16 together, when a heavy object is lifted, the pulling force applied to the lifting rope 13 is transmitted to the fixed pulley block II 16 and then transmitted to the lifting weight limiter 15 through the fixed pulley block II 16, so that the weight of the lifted heavy object is measured. Specifically, as shown in fig. 2 and 4, the set ii pulley 16 is mounted on a connecting plate 161, one end of the connecting plate 161 is hinged to the second main chord 32 of the jib 3, the other end of the connecting plate 161 is connected to the carrying end of the load limiter 15, and the mounting end of the load limiter 15 is mounted on the second main chord 32 of the jib 3. In this embodiment, since the lifting rope 13 goes around from the bottom of the fixed pulley block ii 16, the lifting rope 13 generates an acting force in a direction close to the first main chord 31 to the fixed pulley block ii 16 under the pulling force of the lifted heavy object, and the fixed pulley block ii 16 is installed on the connecting plate 161, one end of the connecting plate 161 is hinged to the second main chord 32 of the crane boom 3, and the other end is connected to the bearing end of the lifting weight limiter 15, therefore, the end of the connecting plate 161 connected to the bearing end of the lifting weight limiter 15 will receive the acting force in the direction close to the first main chord 31, so that the lifting weight limiter 15 receives the acting force in the direction close to the first main chord 31, and the stress of the lifting rope 13 is transmitted to the lifting weight limiter 15, and the lifting weight limiter 15 can measure the weight of the lifted heavy object by detecting its own stress. The load lifting limiter 15 is mounted on the second main chord 32 through a pin shaft and an ear plate, specifically, the second main chord 32 is provided with the ear plate, the mounting end and the ear plate of the load lifting limiter 15 are both provided with pin holes, and the mounting end and the ear plate of the load lifting limiter 15 are connected by inserting the pin shaft into the pin holes; the fixed pulley block II 16 is arranged on the connecting plate 161 through a pin shaft; the fixed pulley block iii 17 is installed in an arm section of the boom 3 and is close to a position of the first main chord 31 of the boom 3, specifically, a vertical rod is welded on the first main chord 31, and the fixed pulley block iii 17 is fixed on the vertical rod. In addition, as can be seen from the above, the lifting rope 13 wound around the fixed pulley block I14, the fixed pulley block II 16 and the fixed pulley block III 17 is reversely bent only once, namely, the lifting rope is wound around the top of the fixed pulley block III 17 from the bottom of the fixed pulley block II 16, so that the service life of the lifting rope 13 is longer.

Fig. 5 and 7 show another installation manner of the load limiter 15 on the boom 3, wherein a load limiter pulley 151 is arranged on the load limiter 15, the load limiter pulley 151 is located between the fixed pulley block ii 16 and the fixed pulley block iii 17, and the lifting rope 13 sequentially passes through the bottom of the fixed pulley block i 14, the top of the fixed pulley block ii 16, the bottom of the load limiter pulley 151 and the top of the fixed pulley block iii 17 and passes through the top of the arm tip fixed pulley block 18. Through establishing load lifting limiter pulley 151 on load lifting limiter 15 for when hoist and mount the heavy object, rise the pulling force that rope 13 will receive and transmit for load lifting limiter pulley 151, the rethread load lifting limiter pulley 151 transmits for load lifting limiter 15, thereby measures the weight of hoist and mount heavy object. Specifically, the load limiter pulley 151 is attached to the load bearing end of the load limiter 15, and the mounting end of the load limiter 15 is mounted to the second main chord 32 of the boom 3. In this embodiment, since the lifting rope 13 is wound around the bottom of the lifting weight limiter pulley 151, the lifting rope 13 generates an acting force in the direction close to the first main chord 31 to the lifting weight limiter pulley 151 under the pulling force of the lifted weight, and the lifting weight limiter pulley 151 is connected to the bearing end of the lifting weight limiter 15, so that the lifting weight limiter 15 receives the acting force in the direction close to the first main chord 31, the stress of the lifting rope 13 is transmitted to the lifting weight limiter 15, and the lifting weight limiter 15 can measure the weight of the lifted weight by detecting the self stress. The fixed pulley block II 16 is mounted in an arm root section of the crane boom 3 and is close to the first main chord 31 of the crane boom 3 through a pin shaft and an ear plate, specifically, the first main chord 31 is provided with the ear plate, the fixed pulley block II 16 and the ear plate are both provided with pin holes, and the fixed pulley block II 16 and the ear plate are connected by inserting the pin shaft into the pin holes; load limiter 15 is also mounted on second main chord 32 by a pin and an ear plate; the crown block iii 17 is likewise mounted in the jib portion of the jib 3 by means of a vertical rod in a position close to the first main chord 31 of the jib 3. In addition, as can be seen from the above, the fixed pulley group ii 16, the lifting weight limiter pulley 151 and the fixed pulley group iii 17 are distributed in an inverted triangle, so that the stress of the lifting rope 13 is better transmitted to the lifting weight limiter 15, and the weight of the lifted heavy object is more accurately measured.

In the above embodiment, the rope guiding wheel set 12 is mounted on the pulley support of the lifting support 21 through the long pin shaft and the clamping plate, specifically, the pulley support is provided with the lug plate, the rope guiding wheel set 12 and the lug plate are both provided with the pin hole, the rope guiding wheel set 12 and the lug plate are connected by inserting the long pin shaft into the pin hole, the end face of the long pin shaft is processed with the limiting groove, then the clamping plate is placed on the limiting groove, and the clamping plate is fixed on the lug plate of the pulley support, so that the rotation and axial movement of the long pin shaft can be limited, and the rope guiding wheel set 12 is more firmly mounted; similarly, the crown block I14 and the arm tip crown block 18 are also mounted on the jib 3 by means of pins and clips. It is understood that the rope guiding pulley set 12, the fixed pulley set i 14, the fixed pulley set ii 16, the load limiter 15, the fixed pulley set iii 17 and the arm tip fixed pulley set 18 may be mounted by other mounting structures, which also belong to the protection scope of the present invention.

Specifically, hoisting mechanism 11 includes motor 111, speed reducer 113, shaft coupling 112, reel 114 and stroke limiter, motor 111 passes through shaft coupling 112 with speed reducer 113 links to each other, the pivot is connected to speed reducer 113's output, be equipped with in the pivot reel 114, play to rise the winding of rope 13 on reel 114, pivot one end is equipped with the stroke limiter, hoisting mechanism 11 is used for providing power for whole play to rise the wiring system, can provide power to the action of putting the rope and receiving the rope to play to rise rope 13 of winding on reel 114 promptly to the realization is lifted by crane to the heavy object.

The invention also provides a tower crane which comprises the hoisting rope winding system. Because the tower crane comprises the hoisting and wiring system, the tower crane at least has all the beneficial effects brought by the hoisting and wiring system, and the detailed description is omitted.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims

1. A lifting rope winding system is characterized by comprising a lifting rope (13), a rope arranging wheel set (12), a plurality of fixed pulley blocks for guiding the lifting rope (13) to carry out rope winding operation, a lifting mechanism (11) for releasing and collecting the lifting rope (13), and a lifting capacity limiter (15) arranged on a lifting arm (3), wherein the rope arranging wheel set (12) is arranged on a lifting support (21), the lifting mechanism (11) and the lifting support (21) are both arranged on a balance arm (2), the plurality of fixed pulley blocks are arranged on the lifting arm (3), and the lifting rope (13) is led out from the lifting mechanism (11) and sequentially wound through the rope arranging wheel set (12) and the plurality of fixed pulley blocks; wherein the fixed pulley blocks comprise a fixed pulley block I (14), a fixed pulley block II (16) and a fixed pulley block III (17) which are used for transiting and winding a lifting rope (13) from the lifting bracket (21) to the lifting arm (3), the fixed pulley group I (14) is arranged at an arm root hinge point (33) of the crane arm (3) for being hinged with the balance arm (2), or an arm root web member (34) connected with the arm root hinge point (33) is arranged between the first main chord member (31) and the second main chord member (32) of the crane arm (3), the fixed pulley group I (14) is arranged on the arm root web member (34) at a position close to the arm root hinge point (33), the fixed pulley block II (16), the lifting capacity limiter (15) and the fixed pulley block III (17) are distributed in an inverted triangle.

2. A hoisting roping system as claimed in claim 1, characterized in that it further comprises that the hoisting ropes (13) pass the mounting position of the load limiter (15) and are able to transfer their force to the load limiter (15).

3. The hoisting roping system of claim 2, characterized in that said plurality of standing block assemblies further comprises an arm point standing block assembly (18), said hoisting rope (13) being passed in turn around said rope guiding block assembly (12), said standing block assembly i (14), said standing block assembly ii (16), said standing block assembly iii (17) and passing out through said arm point standing block assembly (18).

4. A hoisting roping system as claimed in claim 3, characterized in that the load limiter (15) is connected to the standing block ii (16), and the hoisting ropes (13) are passed in turn through the bottom of the standing block i (14), the bottom of the standing block ii (16), the top of the standing block iii (17) and out through the top of the arm point standing block (18).

5. Hoisting roping system according to claim 4, characterized in that the set ii of sheaves (16) is mounted on a connecting plate (161), that one end of the connecting plate (161) is hinged to the second main chord (32) of the jib (3), that the other end of the connecting plate (161) is connected to the load-bearing end of the load limiter (15), and that the mounting end of the load limiter (15) is mounted on the second main chord (32) of the jib (3).

6. A hoisting roping system according to claim 3, characterized in that a hoisting limiter pulley (151) is provided on the hoisting limiter (15), the hoisting limiter pulley (151) being located between the standing pulley block ii (16) and the standing pulley block iii (17), the hoisting rope (13) passing through the standing pulley block i (14), the standing pulley block ii (16), the hoisting limiter pulley (151), the standing pulley block iii (17) in turn and passing out through the arm tip standing pulley block (18).

7. Hoisting roping system according to claim 6, characterized in that the load limiter pulley (151) is connected to the load end of the load limiter (15), the mounting end of the load limiter (15) being mounted on the second main chord (32) of the jib (3); the fixed pulley block II (16) is arranged in an arm root section of the cargo boom (3) and is close to the position of a first main chord member (31) of the cargo boom (3).

8. A hoisting roping system as claimed in claim 3, characterized in that the crown block iii (17) is mounted in the jib portion of the jib (3) near the first main chord (31) of the jib (3), that the jib nose crown block (18) is mounted on the outer bottom surface of the jib nose portion of the jib (3), and that the hoisting ropes (13) are passed out through the top of the jib nose crown block (18) and then around the hook pulleys (19) and finally fastened to the anti-twist means of the jib nose portion of the jib (3).

9. The hoisting rope winding system according to any one of claims 1 to 8, wherein the hoisting mechanism (11) comprises a motor (111), a speed reducer (113), a coupler (112), a winding drum (114) and a stroke limiter, the motor (111) is connected with the speed reducer (113) through the coupler (112), the output end of the speed reducer (113) is connected with a rotating shaft, the winding drum (114) is arranged on the rotating shaft, the hoisting rope (13) is wound on the winding drum (114), and the stroke limiter is arranged at one end of the rotating shaft.

10. Hoisting roping system according to any of claims 1 to 8, characterized in that the hoisting support (21) is an a-frame.

11. A tower crane comprising a hoisting roping system as claimed in any of the claims 1 to 10.