Self-propelled tower crane and using method thereof

Abstract

A self-propelled tower crane comprises a tower arm and a tower body connected to the tower arm, the bottom of the tower body is connected to a tower crane walking device, the self-propelled tower crane further comprises a second tower body, the second tower body sequentially comprises a second tower body walking device, a second tower body steel structure and a second tower body connecting assembly from bottom to top, and the second tower body connecting assembly is connected between the second tower body steel structure and the tower arm. The second tower body walking device and the tower crane walking device move in a matched mode to achieve displacement and rotation of the self-propelled tower crane, the combined self-propelled tower crane has higher hoisting capacity and is more stable especially under the sudden load loss working condition, the moving mode and speed of the tower crane are flexibly adjusted according to specific construction requirements and site conditions, and the construction efficiency is improved. The device adapts to complex terrains of construction sites.

Description

Technical Field

[0001] This invention relates to the field of hoisting equipment technology, and in particular to a self-propelled crane tower and its method of use. Background Technology

[0002] Currently, widely used lifting equipment includes tower cranes, gantry cranes, crawler cranes, and jib cranes. Gantry cranes are suitable for long-distance loaded relocation, but their coverage area cannot be dynamically adjusted due to track limitations. Crawler cranes can move and cover different areas, but their lifting efficiency is low. Moreover, as the lifting capacity of crawler cranes increases, the large base size and inherently inclined boom bring increasingly serious spatial interference problems. Jib cranes are mostly used for small and medium-sized loads and are applied to specific operating environments.

[0003] Tower cranes are popular in construction due to their high vertical lifting efficiency, but they have a high center of gravity and are prone to tipping over. They also have weak lifting capacity and a small coverage area, so fixed tower cranes are mostly used. Currently, there are a few self-propelled tower cranes on the market, but their load-bearing capacity is further weakened because they cannot be deeply buried in the foundation. They cannot bear the lifting of heavy objects, especially they cannot meet the anti-tipping requirements under sudden unloading conditions. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a self-propelled tower crane and its usage method, aiming to solve the technical problem that existing hoisting equipment cannot simultaneously achieve strong hoisting capacity, wide coverage, high operating efficiency, and minimal spatial interference.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A self-propelled tower crane includes a tower jib and a tower body connected to the tower jib. The tower jib includes a lifting boom and a counterweight boom. The bottom of the tower body is connected to a tower crane traveling device. A slewing mechanism is connected between the tower body and the tower jib or between the tower body and the tower crane traveling device. The slewing mechanism allows the tower body to rotate. The slewing mechanism includes an upper slewing support, a lower slewing support, and a slewing bearing disposed between the upper and lower slewing supports. It also includes a second tower body. The second tower body, from bottom to top, includes a second tower body traveling device, a second tower body steel structure, and a second tower body connecting assembly. The second tower body traveling device includes a traveling mechanism and a control unit. The traveling mechanism and the control unit are powered by a power system. The second tower body traveling device also includes a load-bearing structure disposed on the upper surface of the traveling mechanism. The load-bearing structure is connected to the second tower body steel structure. The second tower body connecting assembly is connected between the second tower body steel structure and the tower jib. The self-propelled tower crane can be moved and rotated by the cooperation of the second tower body traveling device and the tower crane traveling device.

[0007] Furthermore, the second tower body has a first working position and a second working position.

[0008] When the second tower body is in the first working position, the second tower body connecting component is located between the counterweight arm and the second tower body steel structure. The second tower body steel structure, counterweight arm, and tower body can be combined into a portal column, and a cantilever crane is formed with the lifting arm as the slewing arm.

[0009] When the second tower body is in the second working position, the detachable connection unit is located between the lifting arm and the steel structure of the second tower body, and the lifting arm serves as the main beam, while the tower body and the steel structure of the second tower body serve as the legs to form a gantry crane.

[0010] Furthermore, the second tower traveling device includes an axle vehicle, which is located at the bottom of the load-bearing structure. The axle vehicle can cooperate with the second tower connecting assembly to connect the second tower steel structure and the tower arm, and can move accordingly depending on whether the second tower is in the first or second position.

[0011] Furthermore, if the lifting capacity permits, the second tower body connecting components can be removed, and the connection between the tower arm and the second tower body steel structure can be disconnected, so that the self-propelled tower crane can work independently without relying on the second tower body, thereby improving lifting efficiency.

[0012] Furthermore, the tower arm and the tower body are connected by a first hinge shaft and a tower arm rotation control device. The first hinge shaft connects the tower arm and the tower body, and the axis of the first hinge shaft is perpendicular to the tower arm and the tower body. The tower arm rotation control device is connected to the tower arm and the tower body and can control the tower arm to rotate around the first hinge shaft.

[0013] Furthermore, a second hinge shaft and a tower body rotation control device are provided between the tower body and the upper slewing support. The second hinge shaft connects the tower body and the upper slewing support. The axis of the second hinge shaft is perpendicular to the tower body and parallel to the axis of the first hinge shaft. The tower body rotation control device is connected to the tower body and the upper slewing support to control the tower body to rotate around the second hinge shaft.

[0014] Furthermore, the tower arm rotating device has a first hydraulic cylinder, which includes a first cylinder body, a first piston rod and a first pressure chamber, with the first cylinder body and the first piston rod respectively connected to the tower arm and the tower body;

[0015] The tower rotation device has a second hydraulic cylinder, which includes a second cylinder body, a second piston rod and a second pressure chamber. The second cylinder body and the second piston rod are respectively connected to the tower body and the upper slewing support, and the first pressure chamber is connected to the oil circuit of the second pressure chamber, so that the tower arm rotates to drive the tower body to rotate.

[0016] Furthermore, it also includes a movable counterweight, which is movably connected to the tower arm and can move across the centerline of the tower body on the counterweight boom and the lifting boom.

[0017] Furthermore, the jib rotation control device also includes a jib locking device, which has a first unlocked state and a first locked state.

[0018] When the moving counterweight moves from the boom toward the counterweight and reaches the critical position, the boom locking device can be triggered and put into the first unlocked state.

[0019] When the moving counterweight moves from the counterweight arm toward the direction of the crane arm and reaches the critical position, the tower arm locking device can be triggered and put into the first locking state, at which point the tower arm cannot rotate.

[0020] The tower rotation control device includes a tower locking device, which has a second unlocked state and a second locked state.

[0021] The tower body locking device includes a third hydraulic cylinder, which includes a third pressure chamber connected to the first pressure chamber. Under normal operating conditions, the tower body rotation control device is in the second locking state, and the tower body cannot rotate. When a sudden loss of load occurs, the tower arm rotates, causing the first and third hydraulic cylinders to pressurize, triggering the tower body rotation control device and putting it in the second unlocking state.

[0022] When the third pressure chamber is not connected to the first pressure chamber, the tower rotation control device is triggered and placed in the second locking state, at which time the tower cannot rotate.

[0023] Furthermore, the second tower body connector is connected to the tower arm via a limiting hinge, and the limiting direction of the limiting hinge and the hinge direction are consistent with the connection direction between the limiting hinge and the tower arm.

[0024] The second tower body connector has a third hinge axis between itself and the load-bearing structure. The hinge axis of the third hinge axis is parallel to the ground and consistent with the width direction of the second tower body steel structure, so that the second tower body and the tower arm are in a flexible connection state.

[0025] A method for using a self-propelled tower crane, characterized in that it can be applied to the aforementioned self-propelled tower crane, includes the following steps:

[0026] S1. The second tower steel structure and the lifting arm are connected by detachable components, so that the second tower steel structure, the lifting arm and the tower together form a gantry crane;

[0027] S2. Use a gantry crane to lift the load and move it to the designated position through the cooperation of the crane's traveling device and traveling mechanism.

[0028] S3, the amplitude change brings the load closer to the tower body;

[0029] S4. Disassemble the second tower body connecting assembly to detach the second tower body from the crane boom;

[0030] S5, Rotating Tower Crane;

[0031] S6. Install the detachable component, and connect the second tower steel structure and the counterweight boom through the detachable component, so that the second tower steel structure, the counterweight boom and the tower body form a portal column, and the lifting boom is combined with the slewing boom to form a cantilever crane.

[0032] S7. Hoist the load into place.

[0033] The beneficial effects of this invention are:

[0034] 1. The present invention proposes a self-propelled tower crane, comprising a second tower body, which, from bottom to top, includes a second tower body traveling device, a second tower body steel structure, and a second tower body connecting assembly. The second tower body steel structure is connected to the tower arm through the second tower body connecting assembly, enabling the second tower body traveling device to cooperate with the tower crane traveling device to move and achieve the displacement and rotation of the self-propelled double-tower tower crane. After combination, the self-propelled tower crane has a stronger lifting capacity, especially more stable under sudden loss of load conditions. The tower crane can flexibly adjust its movement mode and speed according to specific construction needs and site conditions to adapt to the complex terrain of the construction site.

[0035] 2. The self-propelled tower crane proposed in this invention has a second tower body with a first working position and a second working position. When the second tower crane is in the first position, the self-propelled tower crane is in cantilever crane mode. When the second tower body is in the second position, the self-propelled tower crane is in gantry crane mode. By switching the position of the second tower body, the working conditions of the tower crane can be switched. This allows the tower crane to quickly switch between cantilever crane mode and gantry crane mode according to construction needs, without the need for additional configuration of different types of lifting equipment. Moreover, the working conditions can be switched simply by changing the position of the second tower body, which greatly reduces the time required for equipment switching in actual use and improves construction efficiency.

[0036] 3. The self-propelled tower crane proposed in this invention includes a second tower body traveling device comprising an axle vehicle. The axle vehicle is located at the bottom of the load-bearing structure. The axle vehicle can cooperate with the second tower body connecting assembly to connect the second tower body steel structure and the tower arm, and can move accordingly depending on whether the second tower body is in a first position or a second position. When the self-propelled tower crane does not require combined working conditions, the axle vehicle can be used in other places. For short-term use, it can be rented to save costs.

[0037] 4. The present invention proposes a self-propelled tower crane, which has a first hinge shaft and a tower arm rotation control device between the tower arm and the tower body. The first hinge shaft connects the tower arm and the tower body, and the axis of the first hinge shaft is perpendicular to the tower arm and the tower body. The tower arm rotation control device is connected to the tower arm and the tower body and can control the rotation resistance of the tower arm around the first hinge shaft. In the event of a sudden loss of load, the rotation of the tower arm can effectively buffer the impact on the tower body when the tower crane is unbalanced. When the tower crane is combined into a gantry crane mode and a cantilever crane mode, the tower arm can rotate to ensure that the connection point between the tower body and the tower arm is in a flexible connection state.

[0038] 5. The present invention proposes a self-propelled tower crane, wherein a second hinge shaft and a tower body rotation control device are provided between the tower body and the upper slewing support. The second hinge shaft connects the tower body and the upper slewing support, and the axis of the second hinge shaft is perpendicular to the tower body and parallel to the axis of the first hinge shaft. The tower body rotation control device is connected to the tower body and the upper slewing support to control the rotation resistance of the tower body around the second hinge shaft. The rotation of the tower body can change the position of the tower crane's center of gravity to correct the center of gravity shift caused by various working conditions.

[0039] 6. The present invention proposes a self-propelled tower crane, wherein the tower boom rotation control device includes a first hydraulic cylinder, the first hydraulic cylinder including a first pressure chamber, and the tower body rotation control device includes a second hydraulic cylinder, the second hydraulic cylinder including a second pressure chamber. The first pressure chamber and the second pressure chamber are connected by an oil circuit. In the event of a sudden loss of load, the center of gravity of the tower crane shifts to the counterweight boom side, and the tower boom rotates due to imbalance. The rotation of the tower boom pressurizes the first hydraulic cylinder, which in turn pressurizes the second hydraulic cylinder, driving the tower body to rotate, and the center of gravity of the tower crane returns to the equilibrium position.

[0040] 7. The self-propelled tower crane proposed in this invention includes a tower boom rotation control device and a tower boom locking device, and a tower body rotation control device and a tower body locking device, which can prevent the tower boom or tower body from rotating unexpectedly under the influence of external forces, reduce the swaying of the tower boom and tower body, and reduce safety accidents caused by unexpected rotation and swaying. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of a self-propelled tower crane according to the present invention;

[0043] Figure 2 This is one of the schematic diagrams of the second tower body of a self-propelled tower crane according to the present invention;

[0044] Figure 3 This is a second schematic diagram of the second tower body of a self-propelled tower crane according to the present invention;

[0045] Figure 4 This is a schematic diagram of a cantilever crane mode of a self-propelled tower crane according to the present invention;

[0046] Figure 5 This is a schematic diagram of a gantry crane mode for a self-propelled tower crane according to the present invention;

[0047] Figure 6This is a schematic diagram of the rotation of the tower boom and tower body of a self-propelled tower crane under a sudden loss of load condition according to the present invention;

[0048] Figure 7 This is a schematic diagram of the connection structure between the first hydraulic cylinder and the second hydraulic cylinder of a self-propelled tower crane according to the present invention.

[0049] Figure 8 This is a schematic diagram of the connection structure between the first hydraulic cylinder and the third hydraulic cylinder of a self-propelled tower crane according to the present invention.

[0050] In the diagram, 1000 is a self-propelled tower crane; 1100 is the tower arm; 1110 is the counterweight boom; 1120 is the lifting boom; 1200 is the tower body; 1300 is the upper slewing bearing; 1400 is the slewing bearing; 1500 is the lower slewing bearing; 1600 is the tower crane traveling device; 1700 is the second tower body; 1710 is the second tower body traveling device; 1720 is the second tower body steel structure; 1721 is the second tower body steel structure base; 1722 is the upper frame of the second tower body steel structure; 1730 is the second tower body counterweight; 1740 is the second tower body connecting assembly; 1810 is the first hinge shaft; 1820 is the tower arm rotation control device; 1830 is the second hinge shaft; 1840 is the tower body rotation control device; 1850 is the first hydraulic cylinder; 1860 is the second hydraulic cylinder; and 1870 is the third hydraulic cylinder. Detailed Implementation

[0051] The following is combined Figures 1-8 The present invention will be described in detail below.

[0052] A self-propelled tower crane 1000 includes a tower arm 1100 and a tower body 1200 connected to the tower arm 1100. The tower arm 1100 includes a lifting boom 1120 and a counterweight boom 1110. The bottom of the tower body 1200 is connected to a tower crane traveling device 1600. A slewing mechanism is connected between the tower body 1200 and the tower arm 1200 or between the tower body 1200 and the tower crane traveling device 1600. The slewing mechanism allows the tower body 1200 to rotate. The slewing mechanism includes an upper slewing support 1300, a lower slewing support 1400, and a slewing bearing disposed between the upper slewing support 1300 and the lower slewing support 1400.

[0053] The self-propelled tower crane 1000 also includes a second tower body 1700. The second tower body 1700, from bottom to top, includes a second tower body traveling device 1710, a second tower body steel structure 1720, and a second tower body connecting assembly 1740. The second tower body traveling device 1710 includes a traveling mechanism and a control unit, which are powered by a power system. The second tower body traveling device 1710 also includes a load-bearing structure on the upper surface of the traveling mechanism, which is connected to the second tower body steel structure 1720. The second tower body connecting assembly 1740 is connected between the second tower body steel structure 1720 and the tower arm 1100. The self-propelled tower crane 1000 can be moved and rotated by the cooperation of the second tower body traveling device 1710 and the tower crane traveling device 1600. After combination, the self-propelled tower crane 1000 has a stronger lifting capacity, especially under sudden loss of load conditions, and is more stable. The tower crane can flexibly adjust its movement mode and speed according to specific construction needs and site conditions to adapt to the complex terrain of the construction site.

[0054] Furthermore, if the lifting capacity permits, the second tower body connecting assembly 1740 can be removed, and the connection between the tower arm 1100 and the second tower body steel structure 1720 can be disconnected. The self-propelled tower crane 1000 can then work independently without relying on the second tower body 1700, thereby improving lifting efficiency.

[0055] In this embodiment, the second tower body 1700 has a first working position and a second working position.

[0056] When the second tower body 1700 is in the first working position, the second tower body connecting assembly 1740 is located between the counterweight arm 1110 and the second tower body steel structure 1720. The second tower body steel structure 1720, the counterweight arm 1110, and the tower body 1200 can be combined into a portal column, and a cantilever crane is formed with the lifting arm 1120 as the slewing arm.

[0057] When the second tower body 1700 is in the second working position, the second tower body connecting assembly 1740 is located between the jib 1120 and the second tower body steel structure 1720, and the jib 1120 serves as the main beam, while the tower body 1200 and the second tower body steel structure 1720 serve as the legs to form a gantry crane; and the cantilever crane mode and the gantry crane mode can be switched directly without the load of the tower crane touching the ground.

[0058] By switching the position of the second tower body at 1700, the tower crane's operating mode can be changed. This allows the tower crane to quickly switch between cantilever crane mode and gantry crane mode according to construction needs, without the need for additional configuration of different types of lifting equipment. Furthermore, the operating mode can be switched simply by changing the position of the second tower body at 1700, which greatly reduces the time required for equipment switching in actual use and improves construction efficiency.

[0059] Specifically, the traveling mechanism is an axle trolley, which is located at the bottom of the load-bearing structure. The axle trolley can work with the second tower body connecting assembly 1740 to connect the second tower body steel structure 1720 and the tower arm 1100, and can move accordingly depending on whether the second tower body 1700 is in the first or second position. The axle trolley can adjust the position of the second tower body steel structure 1720 in various directions, and the axle trolley is equipped with a height adjustment device to adjust the height of the second tower body steel structure 1720. After the connection is completed, the axle trolley can move in coordination with either the gantry crane mode or the cantilever crane mode to realize the rotation and displacement of the self-propelled tower crane 1000. When the self-propelled tower crane 1000 does not need to be combined with other working conditions, the axle trolley can be used in other places. For short-term use, it can be rented to save costs.

[0060] Specifically, the second tower steel structure 1720 includes a second tower steel structure upper frame 1722 and a second tower steel structure base 1721. The second tower steel structure upper frame 1722 and the second tower steel structure base 1721 are hinged together, with the hinge direction perpendicular to the thickness direction of the second tower steel structure upper frame 1722. The second tower steel structure base 1721 has space for axle trolleys to be inserted and lifted. The second tower steel structure upper frame 1722 has a triangular structure, and its top is hinged to the second tower connector 1740, with the hinge direction perpendicular to the thickness direction of the triangular frame.

[0061] In this embodiment, the second tower body 1700 also includes a second tower body counterweight 1730, which is attached to the second tower body steel structure 1720 and is used to adjust the weight and center of gravity of the second tower body 1700. It can be selectively configured according to operational requirements.

[0062] In this embodiment, a first hinge shaft 1810 and a tower arm rotation control device 1820 are provided between the tower arm 1100 and the tower body 1200. The first hinge shaft 1810 connects the tower arm 1100 and the tower body 1200, and the axis of the first hinge shaft 1810 is perpendicular to the tower arm 1100 and the tower body 1200. The tower arm rotation control device 1810 is connected to the tower arm 1100 and the tower body 1200 and can control the rotation resistance of the tower arm 1100 around the first hinge shaft 1810. In the event of a sudden loss of load, the rotation of the tower arm 1100 can effectively buffer the impact on the tower body 1200 when the tower crane is unbalanced. When the tower crane is combined into a gantry crane mode and a cantilever crane mode, the tower arm 1100 can rotate to ensure that the connection point between the tower body 1200 and the tower arm 1100 is in a flexible connection state.

[0063] Furthermore, a second hinge shaft 1830 and a tower rotation control device 1840 are provided between the tower body 1200 and the upper slewing support 1300. The second hinge shaft 1830 connects the tower body 1200 and the upper slewing support 1300. The axis of the second hinge shaft 1830 is perpendicular to the tower body 1200 and parallel to the axis of the first hinge shaft 1810. The tower rotation control device 1840 is connected to the tower body 1200 and the upper slewing support 1300, controlling the rotational resistance of the tower body 1200 around the second hinge shaft 1830. Rotation of the tower body 1200 can change the center of gravity position of the tower crane to correct the center of gravity shift caused by various working conditions. Moreover, since the tower body 1200 is very long in practical applications, even a small angle of rotation of the tower body 1200 can significantly change the center of gravity position of the tower crane.

[0064] Specifically, the tower arm rotation control device 1820 has a first hydraulic cylinder 1850, which includes a first cylinder body, a first piston rod and a first pressure chamber. The first cylinder body and the first piston rod are respectively connected to the tower arm 1100 and the tower body 1200.

[0065] The tower rotation control device 1840 includes a second hydraulic cylinder 1860, which comprises a second cylinder body, a second piston rod, and a second pressure chamber. The second cylinder body and the second piston rod are respectively connected to the tower body 1200 and the upper slewing support 1300, and the first pressure chamber and the second pressure chamber are connected by an oil circuit, causing the tower arm 1100 to rotate, which in turn drives the tower body 1200 to rotate. In the event of a sudden loss of load, the tower crane's center of gravity will shift towards the counterweight boom 1110, causing the tower arm 1100 to rotate due to imbalance. The rotation of the tower arm 1100 pressurizes the first hydraulic cylinder 1850. Since the first pressure chamber and the second pressure chamber have the same oil circuit, the pressurization of the first hydraulic cylinder 1850 drives the pressurization of the second hydraulic cylinder 1860. The second hydraulic cylinder 1860 drives the tower body 1200 to rotate, allowing the tower crane's center of gravity to return to the balanced position.

[0066] In this embodiment, the self-propelled tower crane 1000 also includes a movable counterweight, which is movably connected to the tower jib 1100 and can move across the centerline of the tower body 1200 on the counterweight boom 1110 and the jib 1120. That is, the movable counterweight can move on the entire tower jib 1100, ensuring that the torque difference between the counterweight boom 1110 and the jib 1120 is within a safe range under various working conditions by dynamically adjusting the position of the movable counterweight, thereby significantly increasing the load capacity of the tower crane.

[0067] In this embodiment, the tower boom rotation control device 1820 also includes a tower boom locking device. The tower boom rotation control device 1820 has a first unlocked state and a first locked state. When the moving counterweight moves from the lifting boom 1120 toward the counterweight 1110 and reaches the critical position (that is, the position where the tower boom locking device switches between the first unlocked state and the first locked state during the movement of the moving counterweight of this mass), the tower boom locking device can be triggered and put into the first unlocked state. At this time, the tower boom 1100 and the tower body 1200, and the tower boom 1100 and the second tower body steel structure 1720 are all flexibly connected.

[0068] When the moving counterweight moves from the counterweight boom 1110 toward the boom 1120 and reaches the critical position, the boom locking device can be triggered and put into the first locking state. At this time, the boom 1100 cannot rotate because the moving counterweight is usually on the boom 1120 under light load. Triggering the boom locking device with the moving counterweight can ensure that the boom locking device will not be triggered to unlock under light load. Only under heavy load, the moving counterweight passes through the center line of the boom 1200 to the counterweight boom 1110 to unlock the boom locking device.

[0069] The tower rotation control device 1840 includes a tower locking device, which has a second unlocked state and a second locked state. The tower locking device includes a third hydraulic cylinder 1870, which includes a third pressure chamber. When the third pressure chamber is connected to the first pressure chamber, the tower rotation control device 1840 is triggered and placed in the second unlocked state.

[0070] When the third pressure chamber is not connected to the first pressure chamber, the tower body rotation control device 1840 is triggered and put into the second locking state. At this time, the tower body 1200 cannot rotate. Under light load, the tower arm 1100 does not rotate. The first and third pressure chambers are pressurized, the tower body 1200 locking device is unlocked, and the third pressure chamber is pressurized to drive the tower body 1200 to rotate.

[0071] In this embodiment, the second tower body connecting assembly 1740 is connected to the tower arm 1200 by a limiting hinge (not shown in the figure), and the limiting direction and hinge direction of the limiting hinge are consistent with its connection direction with the tower arm 1100.

[0072] The second tower body connecting assembly 1740 has a third hinge (not shown in the figure) between it and the load-bearing structure. The hinge direction of the third hinge is parallel to the ground and consistent with the width direction of the second tower body steel structure, so that the second tower body 1700 and the tower arm 1100 are in a flexible connection state.

[0073] This invention provides a self-propelled tower crane 1000, which can be combined into a cantilever crane to increase load capacity, or into a gantry crane for long-distance loaded travel. The second tower section 1700 can also be disassembled and used independently as a traditional self-propelled tower crane 1000 to improve lifting efficiency. When transporting large modules from a distant prefabrication site to the actual site, the self-propelled tower crane 1000 can directly switch from gantry crane mode to cantilever crane mode for lifting and positioning. Even when the tower section 1200 is used alone, due to the innovative design of the tower arm 1100 driving the rotation of the tower section 1200, the self-propelled tower crane also has a strong load capacity and meets the anti-overturning safety requirements under sudden load loss conditions. This invention provides an integrated solution for the transportation and lifting of large equipment or modules in large sites such as chemical plants, power plants, and docks, offering excellent economic efficiency and safety.

[0074] This invention provides a method for using a self-propelled tower crane 1000, applicable to the aforementioned self-propelled tower crane 1000, comprising the following steps:

[0075] S1. The second tower steel structure 1720 and the jib 1120 are connected by the second tower connection assembly 1740, so that the second tower steel structure 1720, the jib 1120 and the tower 1200 together form a gantry crane.

[0076] S2. Use a gantry crane to lift the load and move it to the designated position through the cooperation of the tower crane traveling device 1600 and the traveling mechanism.

[0077] S3, the amplitude change brings the load closer to the tower body by 1200;

[0078] S4. Disassemble the second tower body connecting assembly 1720 so that the second tower body 1700 is detached from the lifting boom 1120;

[0079] S5, Rotating Tower Crane;

[0080] S6. Install the second tower body connecting assembly 1740, and connect the second tower body steel structure 1720 and the counterweight boom 1110 through the second tower body connecting assembly 1740, so that the second tower body steel structure 1720, the counterweight boom 1110 and the tower body 1200 form a portal column, and the lifting boom 1120 is used as a slewing boom to form a cantilever crane.

[0081] S7. Hoist the load into place.

[0082] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand and implement the present invention. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A self-propelled tower crane, comprising a tower jib and a tower body connected to the tower jib, the tower jib including a lifting jib and a counterweight jib, the bottom of the tower body connected to a tower crane traveling device, a slewing mechanism connected between the tower body and the tower jib or between the tower body and the tower crane traveling device, the slewing mechanism enabling the tower body to rotate, the slewing mechanism including an upper slewing support, a lower slewing support, and a slewing bearing disposed between the upper slewing support and the lower slewing support, characterized in that, It also includes a second tower body, which, from bottom to top, includes a second tower body traveling device, a second tower body steel structure, and a second tower body connecting assembly. The second tower body traveling device includes a traveling mechanism and a control unit, which are powered by a power system. The second tower body traveling device also includes a load-bearing structure disposed on the upper surface of the traveling mechanism, which is connected to the second tower body steel structure. The second tower body connecting assembly is connected between the second tower body steel structure and the tower arm. The self-propelled tower crane can be moved and rotated by the cooperation of the second tower body traveling device and the tower crane traveling device.

2. A self-propelled tower crane as described in claim 1, characterized in that, The second tower body has a first working position and a second working position. When the second tower body is in the first working position, the second tower body connecting assembly is located between the counterweight arm and the second tower body steel structure. The second tower body steel structure, the counterweight arm, and the tower body can be combined into a portal column, and a cantilever crane is formed with the lifting arm as the slewing arm. When the second tower body is in the second working position, the detachable connection unit is located between the lifting arm and the second tower body steel structure, and the lifting arm serves as the main beam, while the tower body and the second tower body steel structure serve as the legs to form a gantry crane.

3. A self-propelled tower crane as described in claim 2, characterized in that, The second tower traveling device includes an axle trolley, which is located at the bottom of the load-bearing structure. The axle trolley can cooperate with the second tower connecting assembly to connect the second tower steel structure and the tower arm, and can move accordingly depending on whether the second tower is in a first position or a second position.

4. A self-propelled tower crane as described in claim 1, characterized in that, If the lifting capacity permits, the second tower body connecting assembly is removed, and the connection between the tower arm and the second tower body steel structure is disconnected. The self-propelled tower crane can then operate independently without relying on the second tower body, thereby improving lifting efficiency.

5. A self-propelled tower crane as described in claim 1, characterized in that, The tower arm and the tower body are connected by a first hinge shaft and a tower arm rotation control device. The first hinge shaft connects the tower arm and the tower body, and the axis of the first hinge shaft is perpendicular to the tower arm and the tower body. The tower arm rotation control device is connected to the tower arm and the tower body and can control the tower arm to rotate around the first hinge shaft.

6. A self-propelled tower crane as described in claim 5, characterized in that, The tower body and the upper slewing support are connected by a second hinge shaft and a tower body rotation control device. The second hinge shaft connects the tower body and the upper slewing support. The axis of the second hinge shaft is perpendicular to the tower body and parallel to the axis of the first hinge shaft. The tower body rotation control device is connected to the tower body and the upper slewing support to control the tower body to rotate around the second hinge shaft.

7. A self-propelled tower crane as described in claim 6, characterized in that, The tower arm rotating device has a first hydraulic cylinder, which includes a first cylinder body, a first piston rod and a first pressure chamber. The first cylinder body and the first piston rod are respectively connected to the tower arm and the tower body. The tower rotation device has a second hydraulic cylinder, which includes a second cylinder body, a second piston rod, and a second pressure chamber. The second cylinder body and the second piston rod are respectively connected to the tower body and the upper slewing support, and the first pressure chamber and the second pressure chamber are connected by an oil circuit, so that the rotation of the tower arm drives the rotation of the tower body.

8. A self-propelled tower crane as described in claim 7, characterized in that, It also includes a movable counterweight, which is movably connected to the tower arm and can move across the centerline of the tower body on the counterweight arm and the lifting arm.

9. A self-propelled tower crane as described in claim 8, characterized in that, The tower boom rotation control device also includes a tower boom locking device, which has a first unlocked state and a first locked state. When the moving counterweight moves from the lifting arm toward the counterweight arm and reaches the critical position, the tower arm locking device can be triggered and put into the first unlocked state. When the moving counterweight moves from the counterweight arm toward the crane arm and reaches the critical position, the tower arm locking device can be triggered and placed in the first locking state, at which time the tower arm cannot rotate. The tower rotation control device includes a tower locking device, which has a second unlocked state and a second locked state. The tower body locking device includes a third hydraulic cylinder, which includes a third pressure chamber connected to the first pressure chamber. Under normal operating conditions, the tower body rotation control device is in the second locking state, and the tower body cannot rotate. When a sudden loss of load occurs, the tower arm rotates, pressurizing the first and third hydraulic cylinders, triggering the tower body rotation control device, and putting it in the second unlocking state.

10. A self-propelled tower crane as described in claim 1, characterized in that, The second tower body connector is connected to the tower arm via a limiting hinge, and the limiting direction and hinge direction of the limiting hinge are consistent with its connection direction to the tower arm. The second tower body connector has a third hinge axis between itself and the load-bearing structure. The hinge axis of the third hinge axis is parallel to the ground and is consistent with the width direction of the second tower body steel structure, so that the second tower body and the tower arm are in a flexible connection state.

11. A method of using a self-propelled tower crane, characterized in that, Applicable to a self-propelled tower crane according to any one of claims 1-10, comprising the following steps: S1. The second tower steel structure and the lifting arm are connected by the detachable component, so that the second tower steel structure, the lifting arm and the tower together form a gantry crane; S2. Use the gantry crane to lift the load, and move it to the designated position through the cooperation of the crane traveling device and the traveling mechanism. S3. The amplitude is adjusted to bring the load closer to the tower body; S4. Disassemble the second tower body connecting assembly so that the second tower body is detached from the lifting arm; S5, Rotating Tower Crane; S6. Install the detachable component, and connect the second tower steel structure and the counterweight arm through the detachable component, so that the second tower steel structure, the counterweight arm and the tower body form a portal column, and the lifting arm is combined with the slewing arm to form a cantilever crane. S7. Hoist the load into place.

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