A telescopic tower crane arm

Abstract

The present invention discloses a telescopic tower crane arm, belonging to the field of tower cranes, which includes a boom, a luffing trolley installed on the boom, and a hook suspended on the luffing trolley. The boom is of a multi-stage telescopic structure, and the boom includes a main boom and a plurality of movable booms that are sequentially movably connected relative to the main boom. Each movable boom is provided with a telescopic driving device; two parallel and relatively arranged traveling tracks are installed on the main boom and each movable boom, and a connecting track for connecting with the traveling track on one side of its tip is installed at the tip of each traveling track; the luffing trolley includes a vehicle body, vertical support arms are respectively installed on two opposite sides of the top surface of the vehicle body, a horizontal support arm is fixedly installed on the vertical support arm, and a traveling wheel adapted to the traveling track is rotatably connected to the free end of the horizontal support arm. A luffing device for driving the luffing trolley to move is also installed on the main boom. The present invention can not only effectively improve the retracting operation efficiency of the boom, but also has a reasonable design.

Description

Technical Field

[0001] The present invention relates to the field of tower cranes, and particularly to a telescopic tower crane arm. Background Art

[0002] Mobile tower cranes such as truck cranes, crawler cranes, etc., although convenient to move, are usually easily restricted by site conditions, such as the area of the erection site, the bearing load of the foundation, the lifting elevation angle, etc.

[0003] Fixed tower cranes have the advantages of large lifting weight and high lifting efficiency. However, the position of the tower crane needs to be reasonably planned before construction, and the layout principle is to minimize the blind area of the tower crane as much as possible. It is also necessary to check the weight of the lifted object, avoid collisions between multiple tower cranes during operation, and staggered construction, etc.

[0004] However, in the actual use of some projects, it is necessary to consider secondary telescoping of the fixed tower crane that has been arranged, but this has the problems of occupying the construction period and reducing the on-site construction efficiency. In view of this problem. Summary of the Invention

[0005] Aiming at the problems of occupying the construction period and affecting the construction efficiency when performing secondary telescoping on the existing fixed tower crane, the purpose of the present invention is to provide a telescopic tower crane arm.

[0006] To achieve the above purpose, the technical solution of the present invention is as follows:

[0007] A telescopic tower crane arm includes a boom and a luffing trolley installed on the boom. The boom is of a multi-stage telescopic structure. The boom includes a main boom and a plurality of movable arms that are sequentially movably connected relative to the main boom. Each movable arm is provided with a telescopic driving device; two parallel and oppositely arranged traveling rails are installed on the main boom and each movable arm, and a connecting rail for connecting with the traveling rail on one side of its tip is installed at the tip of each traveling rail;

[0008] The luffing trolley includes a vehicle body. Vertical arms are respectively installed on two opposite sides of the top surface of the vehicle body. A horizontal arm is fixedly installed on the vertical arm. A traveling wheel adapted to the traveling rail is rotatably connected to the free end of the horizontal arm. A luffing device for driving the luffing trolley to move is also installed on the main boom.

[0009] Preferably, the installation height of the traveling rail decreases sequentially from the root to the tip of the boom, and the gauge of the traveling rail remains unchanged; the tip of the connecting rail is smoothly transitioned to the top surface of the traveling rail on one side below it.

[0010] Preferably, the luffing device includes a retracting drum and an extending drum, and a winding motor is connected to each of the retracting drum and the extending drum; the retracting drum is fixedly connected to one end of the luffing trolley facing the main boom through a steel wire rope, and the steel wire rope connected to the extending drum bypasses a turning wheel installed at the tip of the boom and is fixedly connected to the other end of the luffing trolley facing away from the main boom.

[0011] Preferably, the telescopic driving device includes a telescopic motor, and the telescopic motor drives the movement of each movable boom through a gear-rack transmission mechanism.

[0012] Preferably, a pulley or a slider is installed on each movable boom, and a slide rail adapted to the pulley or the slider is installed on the main boom and the corresponding movable boom.

[0013] Preferably, the cross-section of the main boom is triangular, slide rails are installed at the three inner corners of the main boom, and pulleys or sliders are installed at the three outer corners of the movable boom connected to the main boom.

[0014] Preferably, there are three movable booms, and the telescopic lengths of the movable booms are 20m, 10m, and 5m respectively.

[0015] Furthermore, a limiting device is configured on each movable boom, and the limiting device is used to lock each movable boom.

[0016] Preferably, the limiting device includes an electromagnet and a limiting pin installed at the output end of the electromagnet.

[0017] Furthermore, a jib is further included, the jib is pivotally connected to the tip of the boom, and a jib driving device for driving the rotation of the jib is installed at the tip of the boom; and a traveling track is further installed on the jib.

[0018] By adopting the above technical solutions, the beneficial effects of the present invention are as follows:

[0019] 1. Due to the configuration of the boom as a multi-stage telescopic structure, when the boom needs to be retracted, only after the corresponding telescopic driving devices of the movable booms are started, the corresponding movable booms can be driven to move towards the tower body side (the boom root side), so that the length of the boom is shortened, and the quickness of the retracting operation is realized.

[0020] 2. Due to the arrangement that a connecting track for connecting with the traveling track on one side of its tip is installed at the tip of each traveling track, when the movable boom telescopes, the traveling tracks installed thereon can be kept in a connected state with the traveling tracks installed on the adjacent main boom or other movable booms, so as not to affect the luffing movement of the luffing trolley. Brief Description of the Drawings

[0021] Figure 1 is the front view of the present invention;

[0022] Figure 2 is the cross-sectional schematic view of the main boom and the first-stage boom in the present invention;

[0023] Figure 3 is the structural schematic view of the luffing trolley in the present invention;

[0024] Figure 4 is the schematic view when the auxiliary boom is in use in the present invention;

[0025] Figure 5 is the schematic view when the auxiliary boom is not in use in the present invention.

[0026] In the figure: 1 - main boom, 2 - first-stage boom, 3 - second-stage boom, 4 - third-stage boom, 5 - slide rail, 6 - pulley, 7 - telescopic drive device, 8 - luffing trolley, 81 - vehicle body, 82 - vertical support arm, 83 - horizontal support arm, 84 - traveling wheel, 9 - luffing device, 91 - retracting winding drum, 92 - extending winding drum, 93 - steering wheel, 94 - steering roller, 95 - steel rope, 10 - main boom track, 11 - first-stage track, 12 - first connecting track, 13 - second-stage track, 14 - second connecting track, 15 - third-stage track, 16 - third connecting track, 17 - limiting device, 18 - auxiliary boom. Specific embodiments

[0027] The following further describes the specific embodiments of the present invention with reference to the accompanying drawings. It should be noted here that the description of these embodiments is for helping to understand the present invention, but does not constitute a limitation to the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc. is the description of the structure of the present invention based on the accompanying drawings, and is only for the convenience of describing the present invention simply, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0029] For the "first" and "second" in this technical solution, they are only the appellation distinctions for the same or similar structures, or the corresponding structures with similar functions, and do not represent the importance arrangement of these structures, nor do they have the meanings of sorting, or comparing sizes, or others.

[0030] In addition, unless otherwise clearly specified and defined, the terms "install" and "connect" should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two structures. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the general idea of the present invention and in connection with the specific context of this solution.

[0031] Embodiment 1

[0032] A telescopic tower crane boom includes a boom, a luffing trolley installed on the boom, and a hook suspended on the luffing trolley.

[0033] As Figure 1 shown, the boom is configured as a multi-stage telescopic structure, which specifically includes a main boom 1 and a plurality of movable booms sequentially movably connected relative to the main boom 1. For example, three movable booms are configured, and are sequentially called a first-stage boom 2, a second-stage boom 3, and a third-stage boom 4 in the direction from the root to the tip of the boom (the direction away from the main boom 1). Of course, in other preferred embodiments, the number of movable booms can also be other numbers.

[0034] Among them, the main boom 1, the first-stage boom 2, the second-stage boom 3, and the third-stage boom 4 are all long strip-shaped structures with a hollow structure formed by splicing metal profiles, and are sequentially sleeved, and two adjacent sections of the boom can be telescopically moved. And the structures of the main boom 1, the first-stage boom 2, the second-stage boom 3, and the third-stage boom 4 are the same, and the difference is only in the cross-sectional dimensions, so as to meet the need of sequential sleeving. Taking the connection between the main boom 1 and the first-stage boom 2 as an example, in this embodiment, the cross-sections of both are configured as triangular structures. As Figure 2 shown, slide rails 5 are installed at the three inner corners of the main boom 1, and pulleys 6 (or sliders) that cooperate with the slide rails 5 are installed at the three outer corners of the first-stage boom 2. It can be understood that there are multiple pulleys 6 arranged at intervals along the length direction of the first-stage boom 2. Similarly, the connection between the second-stage boom 3 and the first-stage boom 2 and the connection between the third-stage boom 4 and the second-stage boom 3 are both realized by the same method and structure.

[0035] In this embodiment, each movable arm (primary arm 2, secondary arm 3, and tertiary arm 4) is provided with a telescopic driving device 7, which is used to drive the corresponding movable arm to perform telescopic movement. In this embodiment, the specific configuration of the telescopic driving device 7 includes a telescopic motor. Taking the telescopic movement of the primary arm 2 relative to the main arm 1 as an example, the telescopic motor is fixed on the main arm 1 through a motor mounting bracket, and a gear is installed on the output shaft of the telescopic motor, while a rack meshing with the gear is fixedly installed on the primary arm 2, so that the telescopic motor drives the primary arm 2 to perform telescopic movement relative to the main arm 1 through a gear-rack transmission mechanism. Similarly, the telescopic movement of the secondary arm 3 relative to the primary arm 2 and the telescopic movement of the tertiary arm 4 relative to the secondary arm 3 are both realized in the same manner and structure.

[0036] In this embodiment, as Figure 3 shown, the luffing trolley 8 includes a vehicle body 81. Usually, when the vehicle body 81 is in use, it is located below the boom. Therefore, vertical arms 82 extending upward are respectively installed on two opposite sides of the top surface of the vehicle body 81. Transverse arms 83 are fixedly installed on the opposite sides of the vertical arms 82, and a traveling wheel 84 is rotatably connected to the free end of the transverse arm 83 through a bearing. Correspondingly, traveling tracks for supporting the traveling wheels are arranged along the length direction of the boom. And, a luffing device 9 for driving the luffing trolley 8 to move is usually installed on the main arm 1.

[0037] In this embodiment, there are two traveling tracks installed on the main arm 1 and each movable arm. The two traveling tracks are parallel and oppositely arranged. In addition, in order to ensure that the luffing trolley 8 can run smoothly between each section of the arm, butt tracks for butt-jointing with the traveling track on one side of its tip are installed at the tips of each traveling track.

[0038] Among them, the main arm track installed on the main arm 1 is defined as the main arm track 10, the track installed on the primary arm 2 is defined as the primary track 11, the first butt track 12 is butt-jointed between the main arm track 10 and the primary track 11; the track installed on the secondary arm 3 is defined as the secondary track 13, the second butt track 14 is butt-jointed between the primary track 11 and the secondary track 13; the track installed on the tertiary arm 4 is defined as the tertiary track 15, and the third butt track 16 is butt-jointed between the secondary track 13 and the tertiary track 15.

[0039] Specifically, when the installation gauge of the main arm track 10, the installation gauge of the primary track 11, the installation gauge of the secondary track 13, and the installation gauge of the tertiary track 15 remain unchanged, then as Figure 1As shown, the main boom track 10, the first-stage track 11, the second-stage track 13, and the third-stage track 15 need to be installed on different height planes from high to low, and: for the first connecting track 12, its root is fixedly connected to the tip of the main boom track 10, its whole is inclined downward from the root to the tip, its tip is configured as a wedge shape and smoothly transitions with the top surface of the first-stage track 11; for the second connecting track 14, its root is fixedly connected to the tip of the first-stage track 11, its whole is inclined downward from the root to the tip, its tip is configured as a wedge shape and smoothly transitions with the top surface of the second-stage track 13; for the third connecting track 16, its root is fixedly connected to the tip of the second-stage track 13, its whole is inclined downward from the root to the tip, its tip is configured as a wedge shape and smoothly transitions with the top surface of the third-stage track 15. With such a setting, when the luffing trolley 8 moves between different sections of the boom, it can move in an uphill or downhill manner, and it is not affected when the movable boom expands and contracts. For example, when the first-stage boom 2 expands and contracts relative to the main boom 1, the first connecting track 12 will not affect the movement of the first-stage track 11.

[0040] In this embodiment, the luffing device 9 is specifically installed inside the hollow structure of the main boom 1. The luffing device 9 includes a retracting reel 91 and an extending reel 92, both of which are fixed inside the main boom 1 through brackets. Correspondingly, two winding motors are fixedly installed inside the main boom 1, and the output shafts of the two winding motors are respectively drivingly connected to the retracting reel 91 and the extending reel 92. Steel ropes 95 for applying traction force are wound on both the retracting reel 91 and the extending reel 92. The retracting reel 91 is directly fixedly connected to one end of the luffing trolley 8 facing the main boom 1 through the steel rope 95, while the steel rope 95 connected to the extending reel 92 is fixedly connected to the other end of the luffing trolley 8 facing away from the main boom 1 after passing around the steering wheel 93 installed at the tip of the lifting boom.

[0041] In this embodiment, the telescopic lengths of the first-stage boom 2, the second-stage boom 3, and the third-stage boom 4 are further configured to be 20m, 10m, and 5m respectively. With such a setting, when the lifting boom performs a retracting operation, it can achieve 7-level retraction in the range of 5 - 35m with a 5m increment. For example, when retracting 15m, it can be achieved by shortening the second-stage boom 3 and the third-stage boom 4; when retracting 25m, it can be achieved by shortening the first-stage boom 2 and the third-stage boom 4. It can be understood that the overall lengths of the first-stage boom 2, the second-stage boom 3, and the third-stage boom 4 are respectively greater than their telescopic lengths. With such a setting, each movable boom has a part that is exposed at one end, so as to facilitate the passage of the luffing trolley 8 and avoid the occurrence of track discontinuity.

[0042] Embodiment Two

[0043] The difference from the first embodiment is that in this embodiment, each movable arm is configured with a limiting device 17, and the limiting device 17 is used to lock each movable arm. For example, the configured limiting device 17 includes an electromagnet and a limiting pin installed on the output end of the electromagnet.

[0044] Taking only the telescopic movement between the primary arm 2 and the main arm 1 as an example for illustration: As Figure 2 shown, the limiting device 17 is fixedly installed on the main arm 1, and limiting blocks are respectively welded at the root and tip positions of the primary arm 2, and limiting holes are formed in the limiting blocks. When the primary arm 2 extends and the limiting hole at its root is opposite to the limiting device 1, by controlling the limiting device 17 to pop out its limiting pin and penetrate into the limiting hole in the primary arm 2, the locking between the primary arm 2 and the main arm 1 can be achieved.

[0045] Among them, a travel switch is usually also installed on the main arm 1. When the limiting block on the primary arm 2 hits this travel switch, the limiting device 17 starts to work to achieve locking. Usually, the travel switch is also used to send a signal to the telescopic motor installed on the main arm 1 to make it stop working.

[0046] Embodiment Three

[0047] The difference from the first embodiment is that in this embodiment, a secondary arm 18 is further included. The secondary arm 18 is pivotally connected to the tip of the lifting arm, that is, the secondary arm 18 is pivotally connected to the tip of the tertiary arm 4 through a horizontally arranged pivot. When not in use, the secondary arm 18 pivots above the tertiary arm 4. At the same time, a secondary arm driving device for driving the rotation of the secondary arm 18 is installed at the tip of the tertiary arm 4. For example, the secondary arm driving device includes a motor, and the motor drives the rotation of the secondary arm 18 through a gear transmission mechanism. In addition, a traveling track is also installed on the secondary arm 18, and the traveling track is connected to the tertiary track 15 in the same manner as in the first embodiment.

[0048] In addition, in order to ensure that the luffing device 9 can be used normally in both the folded and unfolded states of the secondary arm 18, it is configured that: the above-mentioned steering wheel 93 is fixedly installed at the tip of the secondary arm 18, and steering rollers 94 are respectively installed on the upper and lower sides of the tip of the tertiary arm 4 and on the upper side of the root of the secondary arm 18. So that when the secondary arm 18 is in the folded state, the steel rope 95 extending from the luffing take-up reel 92 can be steered through the steering roller 94, after bypassing the steering wheel 93, and then turn back through the steering roller 94 and be connected to the end of the luffing trolley 8 away from the main arm 1, as Figure 4 and Figure 5 shown.

[0049] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present invention, various changes, modifications, substitutions, and variations made to these embodiments still fall within the protection scope of the present invention.

Claims

1. A telescopic tower crane boom, comprising a boom and a luffing trolley installed on the boom, characterized in that: The lifting arm is a multi-stage telescopic structure, comprising a main arm and a plurality of movable arms movably connected in sequence relative to the main arm, each of the movable arms being provided with a telescopic driving device; the main arm and each of the movable arms are provided with two parallel and oppositely arranged running tracks, and the tip of each of the running tracks is provided with a docking track for docking with the running track located on one side of the tip; The luffing trolley comprises a trolley body, two opposite sides of the top surface of the trolley body are respectively installed with vertical arms, a transverse arm is fixedly installed on the vertical arm, a free end of the transverse arm is rotatably connected with a running wheel adapted to the running track, and a luffing device for driving the luffing trolley to move is also installed on the main arm; The installation height of the running track decreases from the root to the tip of the boom, and the track gauge of the running track remains unchanged; the tip of the docking track smoothly transitions to the top surface of the running track located on the lower side thereof; Each of the movable arms is provided with a limiting device, and the limiting device is used to lock each of the movable arms.

2. The telescopic tower crane arm according to claim 1, characterized in that: The luffing device includes a reduction winding drum and an amplification winding drum, both of which are connected to a winding motor; the reduction winding drum is fixedly connected to one end of the luffing trolley toward the main arm through a steel rope, and the steel rope connected to the amplification winding drum passes around the steering wheel installed at the tip of the boom and is fixedly connected to one end of the luffing trolley away from the main arm.

3. The telescopic tower crane arm according to claim 1, characterized in that: The telescopic driving device comprises a telescopic motor, and the telescopic motor drives each of the movable arms to move through a gear rack transmission mechanism.

4. The retractable tower crane arm according to claim 1, wherein: Each of the movable arms is provided with a pulley or a slider, and the main arm and the corresponding movable arms are provided with a slide rail matched with the pulley or the slider.

5. The telescopic tower crane arm according to claim 4, wherein: The cross section of the main arm is triangular, the three inner corners of the main arm are all equipped with the slide rails, and the three outer corners of the movable arm connected to the main arm are all equipped with the pulleys or sliders.

6. The telescopic tower crane boom according to claim 1, characterized in that: There are three movable arms, and the telescopic lengths of each movable arm are 20m, 10m and 5m respectively.

7. The telescopic tower crane boom according to claim 1, wherein: The limiting device comprises an electromagnet and a limiting pin installed on the output end of the electromagnet.

8. The telescopic tower crane boom according to any one of claims 1-7, characterized in that: It also includes a jib, which is pivotally connected to the tip of the boom, and the tip of the boom is equipped with a jib driving device for driving the jib to rotate; and a walking track is also installed on the jib.

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