Amplitude-variable system of tower crane and crane

Abstract

The application provides a luffing system of a tower crane and a crane. The luffing system of the tower crane comprises a luffing winding mechanism and a luffing trolley group. The luffing winding mechanism comprises a fixedly arranged luffing winding drum and a luffing rope wound on the luffing winding drum. The luffing trolley group comprises a first luffing trolley and a second luffing trolley capable of walking along a lifting arm of the tower crane, and a connecting frame detachably connected to the first luffing trolley and the second luffing trolley at two ends. The connecting frame is connected to two ends of the luffing rope, so that the first luffing trolley and the second luffing trolley can be synchronously luffed or independently luffed. Through the technical scheme of the application, synchronous luffing and independent luffing of the first luffing trolley and the second luffing trolley can be simultaneously realized through a set of luffing winding mechanisms, so as to improve the versatility of the crane.

Description

Technical Field

[0001] The present invention belongs to the technical field of engineering machinery, and in particular relates to a luffing system of a tower crane and a crane. Background Art

[0002] The traction trolley type luffing system is widely used in flat-top tower cranes. The traditional traction trolley type luffing trolley is mainly of two types: single trolley and double trolley. The single trolley is mainly used in occasions with small loads, while the double trolley is mainly used in occasions with large loads.

[0003] Existing double trolleys generally use one set of luffing drive mechanism for synchronous luffing, or use two sets of luffing drive mechanism for independent luffing, but cannot use one set of luffing drive mechanism to achieve both synchronous and independent luffing of the double trolleys. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, the present invention provides a tower crane luffing system and a crane, which can simultaneously realize synchronous luffing and independent luffing of dual trolleys through a set of luffing drive mechanisms.

[0005] In order to achieve the above-mentioned object, the present invention provides a luffing system for a tower crane, wherein the luffing system of the tower crane includes: a luffing rope winding mechanism and a luffing car group; the luffing rope winding mechanism includes a fixed luffing drum and a luffing rope wound on the luffing drum; the luffing car group includes a first luffing trolley and a second luffing trolley capable of traveling along the boom of the tower crane, and a connecting frame with the first and second luffing trolleys detachably connected at both ends; wherein the connecting frame is connected to both ends of the luffing rope, so that the first and second luffing trolleys can luff synchronously or independently.

[0006] In an embodiment of the present invention, the connecting frame includes two connecting plates arranged in parallel and at intervals, and the two ends of each connecting plate are detachably connected to the first luffing trolley and the second luffing trolley respectively. The luffing drum is used to be set on the balance arm of the tower crane, and the first luffing trolley is arranged in front of the second luffing trolley and close to the arm tip of the crane arm. The first end of the luffing rope is guided from the luffing drum to the arm tip and the first luffing trolley in sequence, and is connected to one of the connecting plates. The second end of the luffing rope is guided from the luffing drum to the arm root of the crane arm and the second luffing trolley in sequence, and is connected to the other connecting plate.

[0007] In an embodiment of the present invention, the luffing rope winding mechanism also includes two first luffing pulleys for being arranged on the tower head of the tower crane, a second luffing pulley for being arranged between the arm root and the arm tip and located at the upper end of the lifting arm, a third luffing pulley for being arranged at the arm tip and a fourth luffing pulley for being arranged near the arm root and located at the lower end of the lifting arm, the first end of the luffing rope is wound from the luffing drum around the upper side of one of the first luffing pulleys, the upper side of the second luffing pulley and the front side of the third luffing pulley in sequence, and extends to the first luffing trolley to be connected to one of the connecting plates, the second end of the luffing rope is wound from the luffing drum around the upper side of the other first luffing pulley and the lower side of the fourth luffing pulley in sequence, and extends to the second luffing trolley to be connected to the other connecting plate.

[0008] In an embodiment of the present invention, both connecting plates are provided with joint structures, wherein the joint structure on one connecting plate is arranged at the front end of the connecting plate and connected to the first end of the amplitude variation rope, and the joint structure on the other connecting plate is arranged at the rear end of the connecting plate and connected to the second end of the amplitude variation rope.

[0009] In an embodiment of the present invention, the luffing trolley group further includes a first connecting pin, a first mounting plate and a second mounting plate. The first mounting plate and the second mounting plate are spaced apart on one of the first luffing trolley and the second luffing trolley. An end of the connecting plate away from the joint structure is clamped between the first mounting plate and the second mounting plate, and the first connecting pin passes through the first mounting plate, the connecting plate and the second mounting plate in sequence.

[0010] In an embodiment of the present invention, the boom-shifting trolley group also includes a limiting shaft and a third mounting plate arranged on the other of the first boom-shifting trolley and the second boom-shifting trolley. A limiting hole is opened on the third mounting plate, and a mounting hole is opened on the connecting plate corresponding to the limiting hole. The limiting shaft is detachably inserted into the limiting hole and the mounting hole.

[0011] In an embodiment of the present invention, an open slot is formed on one side of the third mounting plate close to the first mounting plate and the second mounting plate, and a positioning shaft is provided on the connecting plate, and the positioning shaft is inserted into the open slot.

[0012] In an embodiment of the present invention, the luffing trolley group also includes: two lifting pulley groups, two lifting rope winding mechanisms and a hook assembly; the two lifting pulley groups are arranged one-to-one at the lower ends of the first luffing trolley and the second luffing trolley; the two lifting rope winding mechanisms are wound one-to-one on the two lifting pulley groups; the hook assembly includes a mounting beam and a crane hook detachably mounted on the mounting beam, and the two ends of the mounting beam are detachably mounted one-to-one on the two lifting pulley groups.

[0013] In an embodiment of the present invention, the mounting beam includes a first connection portion, a second connection portion, a third connection portion and a cutting avoidance portion. The first connection portion and the second connection portion are arranged at both ends of the mounting beam and are used to be connected to the two lifting pulley sets in a one-to-one correspondence. The third connection portion is located between the first connection portion and the second connection portion and is used to be connected to the crane hook. A cutting avoidance portion is formed between the first connection portion and the third connection portion. The cutting avoidance portion enables the first connection portion to be in a non-contact state with the crane hook when the mounting beam pivots around the second connection portion to a suspended state.

[0014] In addition, the present invention also provides a crane, wherein the crane comprises the luffing system of the tower crane described above.

[0015] Through the above technical solution, the luffing system of the tower crane provided by the embodiment of the present invention has the following beneficial effects:

[0016] The luffing car group includes a first luffing trolley and a second luffing trolley capable of walking along the boom of the tower crane, and a connecting frame with both ends of which the first luffing trolley and the second luffing trolley are detachably connected, and the connecting frame can be connected to both ends of the luffing rope, that is, when the two ends of the connecting frame are installed on the first luffing trolley and the second luffing trolley one by one, the luffing rope can be pulled by the luffing drum to achieve synchronous luffing of the first luffing trolley and the second luffing trolley; when one end of the connecting frame is removed from one of the first luffing trolley and the second luffing trolley, the luffing rope can be pulled by the luffing drum to achieve independent luffing of the other of the first luffing trolley and the second luffing trolley, so that the synchronous luffing and independent luffing of the first luffing trolley and the second luffing trolley can be achieved simultaneously through a set of luffing rope winding mechanisms, so as to achieve the purpose of improving the versatility of the crane.

[0017] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 is a schematic diagram of the three-dimensional structure of a tower crane according to one embodiment of the present invention;

[0020] Figure 2 is a schematic structural diagram of variable-luffing roping according to an embodiment of the present invention;

[0021] Figure 3 is a schematic structural diagram of a luffing trainset from one perspective according to an embodiment of the present invention;

[0022] Figure 4is a schematic structural diagram from another perspective of a luffing trainset according to one embodiment of the present invention;

[0023] Figure 5 is a schematic structural diagram of a connecting plate according to an embodiment of the present invention;

[0024] Figure 6 is a structural schematic diagram of a third mounting plate according to an embodiment of the present invention;

[0025] Figure 7 is a structural schematic diagram of a connecting plate, a joint structure and a mounting block according to an embodiment of the present invention;

[0026] Figure 8 is a schematic structural diagram of a hoisting rope according to an embodiment of the present invention;

[0027] Figure 9 2 is a schematic structural diagram of an installation method of a hook assembly and a movable pulley assembly according to an embodiment of the present invention;

[0028] Figure 10 is a structural schematic diagram of another installation method of the hook assembly and the movable pulley assembly according to one embodiment of the present invention;

[0029] Figure 11 2 is a schematic diagram of the structure for installing a crossbeam according to an embodiment of the present invention.

[0030] Description of Reference Numerals

[0031] 1 luffing rope winding mechanism 11 luffing drum

[0032] 12 luffing rope 13 first luffing pulley

[0033] 14 Second luffing pulley 15 Third luffing pulley

[0034] 16 Fourth luffing pulley 17 First tensioning pulley

[0035] 18 Second tension wheel 2 luffing train

[0036] 21 First luffing trolley 22 Second luffing trolley

[0037] 23 connecting frame 231 connecting plate

[0038] 232 Limit axis 233 Positioning axis

[0039] 234 Mounting hole 24 First mounting plate

[0040] 25 Second mounting plate 26 Third mounting plate

[0041] 261 limiting hole 262 opening slot

[0042] 27 Joint structure 271 Clamping plate

[0043] 272 Cross pin 3 lifting pulley block

[0044] 31 Fixed pulley set 32 ​​Movable pulley set

[0045] 4 Lifting rope winding mechanism 41 Lifting drum

[0046] 42 Hoisting rope 43 First hoisting pulley

[0047] 44 Second lifting pulley 5 hook assembly

[0048] 51 Installing beam 511 First connection part

[0049] 512 second connection portion 513 third connection portion

[0050] 514 cutting avoidance portion 515 inclined surface

[0051] 516 Arc surface 52 Crane hook

[0052] 6 Lifting arm 61 Arm tip

[0053] 62 Arm root 7 Balance arm

[0054] 8 Tower Head DETAILED DESCRIPTION

[0055] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0056] The luffing system of a tower crane according to the present invention will be described below with reference to the accompanying drawings.

[0057] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, a luffing system of a tower crane is provided, wherein the luffing system of the tower crane includes:

[0058] The luffing rope winding mechanism 1 comprises a fixed luffing drum 11 and a luffing rope 12 wound on the luffing drum 11; and

[0059] The luffing vehicle assembly 2 comprises a first luffing trolley 21 and a second luffing trolley 22 capable of traveling along the boom 6 of the tower crane, and a connecting frame 23 detachably connecting the first luffing trolley 21 and the second luffing trolley 22 at both ends;

[0060] The connecting frame 23 is connected to both ends of the luffing rope 12 , so that the first luffing trolley 21 and the second luffing trolley 22 can luff synchronously or independently.

[0061] In the embodiment of the present invention, the luffing train 2 includes a first luffing trolley 21 and a second luffing trolley 22 that can travel along the boom 6 of the tower crane, and a connecting frame 23 with both ends detachably connected to the first luffing trolley 21 and the second luffing trolley 22, and the connecting frame 23 can be connected to the two ends of the luffing rope 12, that is, when the two ends of the connecting frame 23 are installed on the first luffing trolley 21 and the second luffing trolley 22 in a one-to-one correspondence, the first luffing can be achieved by pulling the luffing rope 12 through the luffing drum 11. The trolley 21 and the second luffing trolley 22 can achieve synchronous luffing; when one end of the connecting frame 23 is removed from one of the first luffing trolley 21 and the second luffing trolley 22, the luffing drum 11 pulls the luffing rope 12 to achieve independent luffing of the other of the first luffing trolley 21 and the second luffing trolley 22, so that the synchronous luffing and independent luffing of the first luffing trolley 21 and the second luffing trolley 22 can be achieved simultaneously through a set of luffing rope winding mechanism 1, so as to achieve the purpose of improving the versatility of the crane.

[0062] It should be noted that the luffing rope 12 can be a single one, and the luffing rope 12 includes a fixed section and a first luffing section and a second luffing section respectively arranged at both ends of the fixed section. The fixed section is fixed on the luffing drum 11, and the first luffing section and the second luffing section are respectively wound on the luffing drum 11, and the winding directions of the first luffing section and the second luffing section on the luffing drum 11 are opposite, and the end of the first luffing section away from the fixed section and the end of the second luffing section away from the fixed section are respectively connected to the connecting frame 23, so that the luffing When the vehicle set 2 performs luffing motion, one end of the luffing rope 12 can be reeled in, and the other end can be released. In addition, there can be two luffing ropes 12, one end of each of which is wound around the luffing drum 11, and the winding directions of the two luffing ropes 12 on the luffing drum 11 are opposite, and the other ends of the two luffing ropes 12 are respectively connected to the connecting frame 23, so that when the luffing vehicle set 2 performs luffing motion, one luffing rope 12 can be reeled in, and the other luffing rope 12 can be released.

[0063] See also Figures 1 to 4In an embodiment of the present invention, the connecting frame 23 includes two parallel and spaced connecting plates 231, and the two ends of each connecting plate 231 are detachably connected to the first luffing trolley 21 and the second luffing trolley 22 respectively. The luffing drum 11 is used to be set on the balance arm 7 of the tower crane. The first luffing trolley 21 is set in front of the second luffing trolley 22 and is close to the arm tip 61 of the boom 6. The first end of the luffing rope 12 is guided from the luffing drum 11 to the arm tip 61 and the first luffing trolley 21 in sequence, and is connected to one of the connecting plates 231. The second end of the luffing rope 12 is guided from the luffing drum 11 to the arm root 62 of the boom 6 and the second luffing trolley 22 in sequence, and is connected to the other connecting plate 231. That is, the connecting frame 23 can be composed of two connecting plates 231, and one of the connecting plates 231 is located on the same side of one of the first luffing trolley 21 and the second luffing trolley 22, and both ends are detachably connected to the first luffing trolley 21 and the second luffing trolley 22 respectively in a one-to-one correspondence. The other connecting plate 231 is located on the other same side of the first luffing trolley 21 and the second luffing trolley 22, and both ends are detachably connected to the first luffing trolley 21 and the second luffing trolley 22 respectively in a one-to-one correspondence. The two ends of the luffing rope 12 are connected to the two connecting plates 231 in a one-to-one correspondence, so that the force application objects at both ends of the luffing rope 12 can be changed by removing the two connecting plates 231, thereby simplifying the steps of switching the luffing system between synchronous luffing and independent luffing. At the same time, the first luffing trolley 21 is arranged in front of the second luffing trolley 22 and close to the arm tip 61. Relatively, the second luffing trolley 22 is arranged behind the first luffing trolley 21 and close to the arm root 62. The first end of the luffing rope 12 is guided in sequence from the luffing drum 11 to the arm tip 61 and the first luffing trolley 21, and is connected to one of the connecting plates 231. During synchronous luffing or independent luffing, the luffing movement can be achieved by pulling the first end of the luffing rope 12 by the luffing drum 11. The second end of the luffing rope 12 is guided in sequence from the luffing drum 11 to the arm root 62 of the crane arm 6 and the second luffing trolley 22, and is connected to another connecting plate 231. During synchronous luffing or independent luffing, the luffing movement can be achieved by pulling the second end of the luffing rope 12 by the luffing drum 11.

[0064] Specifically, when the first luffing trolley 21 and the second luffing trolley 22 perform synchronous luffing, both ends of each connecting plate 231 are connected to the first luffing trolley 21 and the second luffing trolley 22 in a one-to-one correspondence, and the first end of the luffing rope 12 is pulled by the luffing drum 11 to achieve the forward luffing of the first luffing trolley 21 and the second luffing trolley 22, and the second end of the luffing rope 12 is pulled by the luffing drum 11 to achieve the backward luffing of the first luffing trolley 21 and the second luffing trolley 22; when the first luffing trolley 21 performs independent luffing, each connecting plate 231 is connected to the second luffing trolley 22. When the second luffing trolley 22 performs independent luffing, each connecting plate 231 is removed from the first luffing trolley 21, the first end of the luffing rope 12 is pulled by the luffing drum 11 to achieve forward luffing of the first luffing trolley 21, and the second end of the luffing rope 12 is pulled by the luffing drum 11 to achieve backward luffing of the first luffing trolley 21. When the second luffing trolley 22 performs independent luffing, each connecting plate 231 is removed from the first luffing trolley 21, the first end of the luffing rope 12 is pulled by the luffing drum 11 to achieve forward luffing of the second luffing trolley 22, and the second end of the luffing rope 12 is pulled by the luffing drum 11 to achieve backward luffing of the second luffing trolley 22.

[0065] Of course, the present invention is not limited to this. The connecting frame 23 can also include two connecting plates 231 arranged at intervals and a fixed plate connecting the two connecting plates 231. The two connecting plates 231 are respectively arranged on the two same sides of the first luffing trolley 21 and the second luffing trolley 22, and the two ends of each connecting plate 231 are respectively detachably connected to the first luffing trolley 21 and the second luffing trolley 22 in a one-to-one correspondence. The first end of the luffing rope 12 is connected to one of the connecting plates 231, and the second end of the luffing rope 12 is connected to the other connecting plate 231. That is, when the two ends of each connecting plate 231 are respectively connected to the first luffing trolley 21 and the second luffing trolley 22 in a one-to-one correspondence, the luffing rope 12 is pulled by the luffing drum 11 to achieve synchronous luffing of the first luffing trolley 21 and the second luffing trolley 22; when the two connecting plates 231 are removed from one of the first luffing trolley 21 and the second luffing trolley 22, the independent luffing of the other of the first luffing trolley 21 and the second luffing trolley 22 is achieved by the luffing drum 11 pulling the luffing rope 12.

[0066] In addition, the connecting frame 23 can also include a connecting plate 231 and two mounting structures. The two ends of the connecting plate 231 are detachably connected to the first luffing trolley 21 and the second luffing trolley 22 respectively. The two mounting structures are arranged on the first luffing trolley 21 and the second luffing trolley 22 in a one-to-one correspondence. The first end of the luffing rope 12 is connected to the connecting plate 231, and the second end of the luffing rope 12 is connected to one of the two mounting structures. That is, when the two ends of the connecting plate 231 are connected to the first luffing trolley 21 and the second luffing trolley 22 in a one-to-one correspondence, the synchronous luffing of the first luffing trolley 21 and the second luffing trolley 22 can be achieved by pulling the luffing rope 12 by the luffing drum 11; when the connecting plate 231 is removed from one of the first luffing trolley 21 and the second luffing trolley 22 and the second end of the luffing rope 12 is connected to the mounting structure on the other of the first luffing trolley 21 and the second luffing trolley 22, the independent luffing of the other of the first luffing trolley 21 and the second luffing trolley 22 can be achieved by pulling the luffing rope 12 by the luffing drum 11.

[0067] Please see again Figures 1 to 4 In an embodiment of the present invention, the luffing rope winding mechanism 1 further includes two first luffing pulleys 13 for being arranged on the tower head 8 of the tower crane, a second luffing pulley 14 for being arranged between the arm root 62 and the arm tip 61 and located at the upper end of the boom 6, a third luffing pulley 15 for being arranged at the arm tip 61, and a fourth luffing pulley 16 for being arranged near the arm root 62 and located at the lower end of the boom 6. The first end of the luffing rope 12 passes from the luffing drum 11 around the upper side of one of the first luffing pulleys 13, the upper side of the second luffing pulley 14, and the front side of the third luffing pulley 15 in sequence, and extends to the first luffing trolley 21 and is connected to one of the connecting plates 231. The second end of the luffing rope 12 passes from the luffing drum 11 around the upper side of the other first luffing pulley 13 and the lower side of the fourth luffing pulley 16 in sequence, and extends to the second luffing trolley 22 and is connected to the other connecting plate 231. By setting one of the first luffing pulleys 13, the second luffing pulley 14 and the third luffing pulley 15, the first end of the luffing rope 12 is guided from the luffing drum 11 to the tower head 8, the upper end of the boom 6, the arm tip 61 and the first luffing trolley 21 in sequence, so that the first end of the luffing rope 12 can be tensioned so that the first end of the luffing rope 12 can drag the first luffing trolley 21 and / or the second luffing trolley 22; by setting another first luffing pulley 13 and the fourth luffing pulley 16, the second end of the luffing rope 12 is guided from the luffing drum 11 to the tower head 8, the lower end of the arm root 62 and the second luffing trolley 22 in sequence, so that the second end of the luffing rope 12 can be tensioned so that the second end of the luffing rope 12 can drag the first luffing trolley 21 and / or the second luffing trolley 22.

[0068] Specifically, the luffing rope winding mechanism 1 also includes a first tensioning wheel 17 and a second tensioning wheel 18 which are arranged at intervals on the boom 6. The first tensioning wheel 17 and the second tensioning wheel 18 are located between the first luffing pulley 13 and the second luffing pulley 14 and are on the lower side of the first luffing pulley 13 and the second luffing pulley 14, and the first tensioning wheel 17 is located in front of the second tensioning wheel 18 and is arranged close to the second luffing pulley 14. The first end of the luffing rope 12 is wound from the luffing drum 11 around the upper side of one of the first luffing pulleys 13, the front side of the first tensioning wheel 17, the lower side of the first tensioning wheel 17, the lower side of the second tensioning wheel 18 and the rear side of the second tensioning wheel 18 in sequence, and extends to the upper side of the second luffing pulley 14, so that the first end of the luffing rope 12 can be further tensioned.

[0069] Furthermore, the luffing trolley group 2 also includes two locking structures respectively provided on the first luffing trolley 21 and the second luffing trolley 22. The locking structures are used to fix the position of the first luffing trolley 21 or the second luffing trolley 22 on the boom 6. When the first luffing trolley 21 performs independent luffing, the position of the second luffing trolley 22 can be fixed by the locking structure on the second luffing trolley 22. When the second luffing trolley 22 performs independent luffing, the position of the first luffing trolley 21 can be fixed by the locking structure on the first luffing trolley 21.

[0070] See also Figure 3 and Figure 4 In this embodiment of the present invention, both connecting plates 231 are provided with joint structures 27. The joint structure 27 on one connecting plate 231 is located at the front end of the connecting plate 231 and connected to the first end of the luffing rope 12, while the joint structure 27 on the other connecting plate 231 is located at the rear end of the connecting plate 231 and connected to the second end of the luffing rope 12. That is, the joint structures 27 on the two connecting plates 231 are located at different positions. The joint structure 27 connected to the first end of the luffing rope 12 is located at the front end of one connecting plate 231, meaning that the first end of the luffing rope 12 does not need to cross the corresponding connecting plate 231 for connection. Meanwhile, the joint structure 27 connected to the second end of the luffing rope 12 is located at the rear end of the other connecting plate 231, meaning that the second end of the luffing rope 12 also does not need to cross the corresponding connecting plate 231 for connection. This facilitates the connection of the luffing rope 12. Of course, the present invention is not limited to this embodiment, and the joint structures 27 on the two connecting plates 231 can be located at any position on the connecting plates 231.

[0071] See also Figure 7In this embodiment of the present invention, the joint structure 27 may be a wedge joint. A wedge joint is a component used on various cranes for securing, fastening, or connecting wire rope ends. It features a simple structure, ease of use, and safety and reliability. The wedge joint primarily consists of three parts: a wedge sleeve, a wedge core, and a cross pin. The connecting plate 231 is sandwiched between the clamping plates 271 of the wedge sleeve and connected via a cross pin 272.

[0072] See also Figure 3 In an embodiment of the present invention, the luffing trolley group 2 further includes a first connecting pin, a first mounting plate 24 and a second mounting plate 25. The first mounting plate 24 and the second mounting plate 25 are spaced apart and arranged on one of the first luffing trolley 21 and the second luffing trolley 22. One end of the connecting plate 231 away from the joint structure 27 is clamped between the first mounting plate 24 and the second mounting plate 25, and the first connecting pin passes through the first mounting plate 24, the connecting plate 231 and the second mounting plate 25 in sequence, so that one end of the connecting plate 231 can be detachably mounted on one of the first luffing trolley 21 and the second luffing trolley 22.

[0073] In an embodiment of the present invention, the boom carriage group 2 also includes a limiting shaft 232 and a third mounting plate 26 arranged on the other of the first boom carriage 21 and the second boom carriage 22. A limiting hole 261 is provided on the third mounting plate 26, and a mounting hole 234 is provided on the connecting plate 231 corresponding to the limiting hole 261. The limiting shaft 232 is detachably inserted into the limiting hole 261 and the mounting hole 234. By inserting the limiting shaft 232 into the limiting hole 261 and the mounting hole 234, the other end of the connecting plate 231 can be detachably installed on the other of the first boom carriage 21 and the second boom carriage 22, so as to facilitate the disassembly and assembly of the connecting plate 231. Specifically, the diameter of the limiting hole 261 can be larger than the diameter of the limiting shaft 232, and the mounting hole 234 is provided corresponding to the limiting hole 261. The diameter of the mounting hole 234 is also larger than the diameter of the limiting shaft 232, so that when the luffing rope 12 drags the first luffing trolley 21 and / or the second luffing trolley 22, the wear of the limiting shaft 232 on the inner wall of the limiting hole 261 is reduced. Of course, the present invention is not limited to this. The end of the connecting plate 231 near the joint structure 27 can be directly connected to the other of the first luffing trolley 21 and the second luffing trolley 22 via a connecting pin.

[0074] like Figure 3 、 Figure 5 and Figure 6As shown, in an embodiment of the present invention, an open groove 262 is formed on one side of the third mounting plate 26 close to the first mounting plate 24 and the second mounting plate 25, and a positioning shaft 233 is provided on the connecting plate 231, and the positioning shaft 233 is inserted into the open groove 262. When the two ends of the connecting plate 231 are respectively installed on the first and second luffing trolleys 21 and 22, the positioning shaft 233 on the connecting plate 231 can be first inserted into the open groove 262 for positioning, and then the connecting plate 231 can be connected to the first and second luffing trolleys 21 and 22.

[0075] Specifically, there are two third mounting plates 26, which are arranged in parallel and spaced apart on the other of the first and second luffing trolleys 21 and 22. The connecting plate 231 is located between the two third mounting plates 26, and the limiting shaft 232 is sequentially inserted through the limiting hole 261 of one of the third mounting plates 26, the mounting hole 234 of the connecting plate 231, and the limiting hole 261 of the other third mounting plate 26. In other words, the connecting plate 231 is sandwiched between the two third mounting plates 26 and can be detachably mounted on the two third mounting plates 26 via the limiting shaft 232, thereby ensuring the stability of the installation of the connecting plate 231.

[0076] More specifically, in order to install the two connecting plates 231, the first luffing trolley 21 can be provided with a first mounting plate 24, a second mounting plate 25 and two third mounting plates 26, and the second luffing trolley 22 can also be provided with a first mounting plate 24, a second mounting plate 25 and two third mounting plates 26, and the first mounting plate 24 and the second mounting plate 25 on the first luffing trolley 21 are arranged opposite to the two third mounting plates 26 on the second luffing trolley 22, and the two third mounting plates 26 on the first luffing trolley 21 are arranged opposite to the first mounting plate 24 and the second mounting plate 25 on the second luffing trolley 22.

[0077] See also Figure 1 and Figure 8In an embodiment of the present invention, the luffing car group 2 further includes: two lifting pulley groups 3, two lifting rope winding mechanisms 4 and a hook assembly 5; the two lifting pulley groups 3 are arranged one-to-one at the lower ends of the first luffing trolley 21 and the second luffing trolley 22; the two lifting rope winding mechanisms 4 are wound one-to-one around the two lifting pulley groups 3; the hook assembly 5 includes a mounting beam 51 and a crane hook 52 detachably mounted on the mounting beam 51, and the two ends of the mounting beam 51 are detachably mounted on the two lifting pulley groups 3 one-to-one. That is, when the first luffing trolley 21 and the second luffing trolley 22 are performing synchronous luffing, the two ends of the mounting beam 51 can be installed on the two lifting pulley blocks 3 in a one-to-one correspondence, and the lifting or lowering of the crane hook 52 can be achieved by controlling the two lifting rope winding mechanisms 4; when one of the first luffing trolley 21 and the second luffing trolley 22 is independently luffed, the mounting beam 51 can be removed from the two lifting pulley blocks 3, and then the crane hook 52 removed from the mounting beam 51 can be installed on one of the lifting pulley blocks 3, and the lifting or lowering of the crane hook 52 can be independently controlled by the corresponding lifting rope winding mechanism 4.

[0078] Specifically, the lifting pulley group 3 includes a fixed pulley group 31 and a movable pulley group 32. The fixed pulley group 31 is arranged on the first luffing trolley 21 or the second luffing trolley 22, and the movable pulley group 32 is arranged below the fixed pulley group 31. The two ends of the mounting beam 51 are detachably connected to the movable pulley groups 32 of the two lifting pulley groups 3 in a one-to-one correspondence; the lifting rope winding mechanism 4 includes a lifting drum 41 fixedly arranged on the balance arm 7, a lifting rope 42 wound on the lifting drum 41, and a lifting rope 42 arranged on the lifting drum 41. A first lifting pulley 43 is provided at the upper end of the boom 6, and a second lifting pulley 44 is provided at the lower end of the boom 6, and the second lifting pulley 44 is located at the rear side of the first lifting pulley 43. The lifting rope 42 is passed from the lifting drum 41 around the front side of the first lifting pulley 43 and the rear side of the second lifting pulley 44 in sequence, and then is wound around the fixed pulley group 31 and the movable pulley group 32, and finally is fixed on the boom 6 so that the height of the movable pulley group 32 can be changed by the lifting rope 42.

[0079] See also Figure 9 and Figure 10In an embodiment of the present invention, the mounting beam 51 includes a first connection portion 511, a second connection portion 512, a third connection portion 513 and a cutting avoidance portion 514. The first connection portion 511 and the second connection portion 512 are respectively arranged at both ends of the mounting beam 51 and are used to be connected to the two lifting pulley sets 3 in a one-to-one correspondence. The third connection portion 513 is located between the first connection portion 511 and the second connection portion 512 and is used to be connected to the crane hook 52. A cutting avoidance portion 514 is formed between the first connection portion 511 and the third connection portion 513. The cutting avoidance portion 514 ensures that when the mounting beam 51 pivots around the second connection portion 512 to a suspended state, the first connection portion 511 and the crane hook 52 are in a non-contact state. Then, the two ends of the mounting crossbeam 51 can be mounted on the lifting pulley block 3 in a one-to-one correspondence through the first connecting portion 511 and the second connecting portion 512 of the mounting crossbeam 51, and the crane hook 52 is mounted on the third connecting portion 513 of the mounting crossbeam 51, so that the crane hook 52 can be mounted on the first and second luffing trolleys 21 and 22 of the synchronous luffing; at the same time, a cutting avoidance portion 514 is formed between the first connecting portion 511 and the third connecting portion 513, and the cutting avoidance portion 514 makes it possible for the first connecting portion 511 and the crane hook 52 to be in a non-contact state when the mounting crossbeam 51 pivots around the second connecting portion 512 to be in a suspended state. Then, by providing the cutting avoidance portion 514 between the first connecting portion 511 and the third connecting portion 513, 4. It can ensure that when the first connecting portion 511 of the mounting beam 51 is removed from the corresponding lifting pulley block 3, the mounting beam 51 will not interfere with the crane hook 52, so as to avoid the crane hook 52 being tilted. Therefore, when the first luffing trolley 21 and the second luffing trolley 22 are switched from synchronous luffing to independent luffing, it is only necessary to remove the first connecting portion 511 from the corresponding lifting pulley block 3, without the need to perform a series of cumbersome operations such as removing the mounting beam 51 from the two lifting pulley blocks 3 and then installing the crane hook 52 removed from the mounting beam 51 to one of the lifting pulley blocks 3. This can improve the efficiency of switching the crane hook 52 between synchronous luffing and independent luffing.

[0080] In the embodiment of the present invention, Figure 11As shown, the cutting avoidance portion 514 includes an inclined surface 515 formed on the side of the mounting beam 51 near the crane hook 52, and the inclined surface 515 is arranged obliquely along the third connection portion 513 toward the extension direction of the lifting pulley block 3 correspondingly connected to the first connection portion 511. That is, when the mounting beam 51 is pivoted about the second connection portion 512 to a suspended state, the cutting avoidance portion 514 is formed between the first connection portion 511 and the third connection portion 513 and located on the side of the mounting beam 51 near the crane hook 52, and the inclined surface 515 is arranged obliquely along the extension direction of the third connection portion 513 toward the lifting pulley block 3 correspondingly connected to the first connection portion 511. Therefore, the mounting beam 51 below the third connection portion 513 is in a non-contact state with the crane hook 52. Of course, the present invention is not limited to this, and the cutting avoidance portion 514 may be set as a curved surface in other structural forms, as long as when the mounting beam 51 pivots around the second connecting portion 512 to a suspended state, the mounting beam 51 between the third connecting portion 513 and the first connecting portion 511 and the crane hook 52 are in a non-contact state.

[0081] In this embodiment of the present invention, the cutting avoidance portion 514 further includes an arcuate surface 516 located between the third connection portion 513 and the inclined surface 515. Arcuate surface 516 is concave. This provides a transition between the third connection portion 513 and the inclined surface 515, further ensuring that the portion of the mounting beam 51 near the third connection portion 513 does not interfere with the crane hook 52.

[0082] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0083] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0084] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0085] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A tower crane luffing system, characterized in that: The luffing system of the tower crane includes: A luffing rope winding mechanism (1) comprises a rotatably arranged luffing drum (11) and a luffing rope (12) wound on the luffing drum (11); and A luffing trolley assembly (2) comprising a first luffing trolley (21) and a second luffing trolley (22) capable of traveling along a boom (6) of a tower crane, and a connecting frame (23) detachably connecting the first luffing trolley (21) and the second luffing trolley (22) at both ends; The connecting frame (23) is connected to both ends of the luffing rope (12), so that when both ends of the connecting frame (23) are mounted on the first luffing trolley (21) and the second luffing trolley (22) in a one-to-one correspondence, the luffing drum (11) can be rotated to drive the first luffing trolley (21) and the second luffing trolley (22) to perform synchronous luffing; and when one end of the connecting frame (23) is removed from one of the first luffing trolley (21) and the second luffing trolley (22), the luffing drum (11) can be rotated to drive the other of the first luffing trolley (21) and the second luffing trolley (22) to perform independent luffing; The luffing train set (2) further comprises: Two lifting pulley assemblies (3), the two lifting pulley assemblies (3) being arranged in a one-to-one correspondence at the lower ends of the first luffing trolley (21) and the second luffing trolley (22); Two lifting rope winding mechanisms (4), the two lifting rope winding mechanisms (4) being wound on the two lifting pulley assemblies (3) in a one-to-one correspondence; and A hook assembly (5), the hook assembly (5) comprising a mounting beam (51) and a crane hook (52) detachably mounted on the mounting beam (51), wherein both ends of the mounting beam (51) are detachably mounted on the two lifting pulley blocks (3) in a one-to-one correspondence; A cutting avoidance portion (514) is provided on the lower side of the mounting beam (51), and the cutting avoidance portion (514) is used to be arranged opposite to the crane hook (52) and in a non-contact state when one end of the mounting beam (51) is removed from the corresponding lifting pulley block (3) and the mounting beam (51) is swung to a suspended state.

2. The luffing system of a tower crane according to claim 1, characterized in that: The connecting frame (23) includes two parallel and spaced connecting plates (231), and the two ends of each connecting plate (231) are detachably connected to the first luffing trolley (21) and the second luffing trolley (22) in a one-to-one correspondence. The luffing drum (11) is used to be set on the balance arm (7) of the tower crane. The first luffing trolley (21) is set in front of the second luffing trolley (22) and is close to the arm tip (61) of the boom (6). The first end of the luffing rope (12) is guided from the luffing drum (11) to the arm tip (61) and the first luffing trolley (21) in sequence, and is connected to one of the connecting plates (231). The second end of the luffing rope (12) is guided from the luffing drum (11) to the arm root (62) of the boom (6) and the second luffing trolley (22) in sequence, and is connected to the other connecting plate (231).

3. The luffing system of a tower crane according to claim 2, characterized in that: The luffing rope winding mechanism (1) further comprises two first luffing pulleys (13) for being arranged on the tower head (8) of the tower crane, a second luffing pulley (14) for being arranged between the arm root (62) and the arm tip (61) and located at the upper end of the boom (6), a third luffing pulley (15) for being arranged at the arm tip (61), and a fourth luffing pulley (16) for being arranged near the arm root (62) and located at the lower end of the boom (6). The first end of the luffing rope (12) is connected to the luffing drum (1) by a first end thereof. 1) The second end of the luffing rope (12) passes sequentially around the upper side of one of the first luffing pulleys (13), the upper side of the second luffing pulley (14), and the front side of the third luffing pulley (15), and extends to the first luffing trolley (21) to be connected to one of the connecting plates (231); the second end of the luffing rope (12) passes sequentially from the luffing drum (11) around the upper side of another first luffing pulley (13) and the lower side of the fourth luffing pulley (16), and extends to the second luffing trolley (22) to be connected to the other connecting plate (231).

4. The luffing system of a tower crane according to claim 2, characterized in that: Both connecting plates (231) are provided with a joint structure (27), wherein the joint structure (27) on one of the connecting plates (231) is provided at the front end of the connecting plate (231) and is connected to the first end of the amplitude-changing rope (12), and the joint structure (27) on the other connecting plate (231) is provided at the rear end of the connecting plate (231) and is connected to the second end of the amplitude-changing rope (12).

5. The luffing system of a tower crane according to claim 4, characterized in that: The luffing trolley group (2) further includes a first connecting pin, a first mounting plate (24) and a second mounting plate (25), wherein the first mounting plate (24) and the second mounting plate (25) are spaced apart and arranged on one of the first luffing trolley (21) and the second luffing trolley (22), and an end of the connecting plate (231) away from the joint structure (27) is clamped between the first mounting plate (24) and the second mounting plate (25), and the first connecting pin passes through the first mounting plate (24), the connecting plate (231) and the second mounting plate (25) in sequence.

6. The luffing system of a tower crane according to claim 5, characterized in that: The boom-changing trolley group (2) further includes a limiting shaft (232) and a third mounting plate (26) arranged on the other of the first boom-changing trolley (21) and the second boom-changing trolley (22); a limiting hole (261) is provided on the third mounting plate (26); a mounting hole (234) is provided on the connecting plate (231) corresponding to the limiting hole (261); and the limiting shaft (232) is detachably inserted into the limiting hole (261) and the mounting hole (234).

7. The luffing system of a tower crane according to claim 6, characterized in that: An opening slot (262) is formed on one side of the third mounting plate (26) close to the first mounting plate (24) and the second mounting plate (25), and a positioning shaft (233) is provided on the connecting plate (231), and the positioning shaft (233) is inserted into the opening slot (262).

8. The luffing system of a tower crane according to any one of claims 1 to 7, characterized in that: The mounting beam (51) includes a first connecting portion (511), a second connecting portion (512), a third connecting portion (513) and a cutting avoidance portion (514). The first connecting portion (511) and the second connecting portion (512) are respectively arranged at both ends of the mounting beam (51) and are used to be connected to the two lifting pulley sets (3) in a one-to-one correspondence. The third connecting portion (513) is located between the first connecting portion (511) and the second connecting portion (512) and is used to be connected to the crane hook (52). The cutting avoidance portion (514) is formed between the first connecting portion (511) and the third connecting portion (513). The cutting avoidance portion (514) enables the first connecting portion (511) to be in a non-contact state with the crane hook (52) when the mounting beam (51) pivots around the second connecting portion (512) to be in a suspended state.

9. A crane, characterized in that: The crane comprises a luffing system for a tower crane according to any one of claims 1 to 8.

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