Tower crane with height adjusting capacity

Abstract

The invention provides a tower crane with height adjusting capability, which comprises a cargo boom and a lifting hook, the outer end part of the cargo boom is connected with the lifting hook through a lifting rope, and the cargo boom is a telescopic cargo boom composed of a first hollow frame, a second hollow frame, a third hollow frame and a fourth hollow frame. A first adjusting assembly is installed between the first hollow frame and the second hollow frame, a second adjusting assembly is installed between the second hollow frame and the third hollow frame, and a third adjusting assembly is installed between the third hollow frame and the fourth hollow frame. The height of the tower body is adjusted by changing the relative positions of the hollow frames in a telescopic mode, the lifting arm composed of the telescopic hollow arm frame is adopted to replace a variable-amplitude trolley to adjust the position of a lifting hook, the adjusting efficiency is high, and safety is high.

Description

Technical Field

[0001] The invention relates to the technical field of cranes, and in particular to a tower crane with height-adjusting capability. Background Art

[0002] A tower crane is a revolving crane with a boom mounted on the top of a tower with a certain height. It has a large working space and is mainly used for vertical and horizontal transportation of materials and installation of building components in house construction. Before installing a common tower crane, a foundation consisting of a large concrete slab reinforced with steel bars must be built. Then the first steel truss that makes up the mast is placed in a suitable position and bolted into the embedded foundation. The remaining steel trusses are then stacked together and fixed with high-strength bolts to form the tower section. There is a slewing unit at the top of the mast to support the top rotation of the crane. The jib, balance arm, and working arm are installed on the slewing unit and connected by steel ropes. After the top assembly is completed, a counterweight is installed on the balance arm to balance the load, which effectively reduces the bending moment or torque carried by the mast. Since the working arm is fixed to the crane, a trolley luffing system is required to adjust the radius of the hook.

[0003] If the tower crane is to be climbed, i.e., the height of the tower body is changed, the following process is required: first, a steel climbing frame is installed around the tower base, which has a square cross-section and an opening on one side for the new mast frame to pass through. Then it is lifted to the bottom surface of the slewing unit and firmly fixed at the position of the bottom surface with high-strength bolts. The new mast is lifted onto the climbing frame and hung on the guide rail above the opening. Then the climbing frame is lifted with the top of the crane by the hydraulic cylinder at the bottom, and the new mast is placed in the lifting gap, and the mast is manipulated in the climbing frame to be fixed to the bottom surface of the slewing unit by bolts. Then the bottom of the new part is engaged with the top of the existing mast by decompressing the hydraulic cylinder. The tower body is lifted by cycling this process. After the lifting is completed, the steel climbing frame is completely removed. The way to change the height of this type of tower crane is relatively complicated, the lifting time is long, and high precision is required. Therefore, it is necessary to design a tower crane with the ability to adjust the height. Summary of the invention

[0004] The present invention provides a tower crane with height adjustment capability, so as to solve the problems that the existing tower crane has a complicated height change method, a long lifting time and requires high precision, and realizes the tower height adjustment by changing the relative positions of each hollow frame by telescoping, and has high adjustment efficiency.

[0005] The present invention provides a tower crane with height adjustment capability, comprising a boom and a hook; The outer end of the boom is connected to a hook via a sling; The lifting arm is composed of a first hollow frame, a second hollow frame, a third hollow frame and a fourth hollow frame to form a retractable lifting arm; A first adjustment component is installed between the first hollow frame and the second hollow frame; A second adjustment assembly is installed between the second hollow frame and the third hollow frame; A third adjustment assembly is installed between the third hollow frame and the fourth hollow frame.

[0006] Preferably, the first hollow frame, the second hollow frame, the third hollow frame and the fourth hollow frame all adopt polygonal cross-sections, and the internal volumes of the first hollow frame, the second hollow frame, the third hollow frame and the fourth hollow frame increase successively, the first hollow frame is inserted into the second hollow frame, the second hollow frame is inserted into the third hollow frame, and the third hollow frame is inserted into the fourth hollow frame.

[0007] Preferably, it also includes an electric locking assembly, which is installed on the outer walls of the first hollow frame, the second hollow frame, the third hollow frame, and the fourth hollow frame. The electric locking assembly includes an outer shell, a metal magnetic plate, a metal plate, and a spring. The outer shell is installed on the outer surface of the hollow frame, and the metal magnetic plate is fixedly attached to the inside of the outer shell and is magnetic when current passes through it; the metal plate is installed inside the outer shell and moves up and down along the inside of the outer shell, and the spring is installed between the metal magnetic plate and the metal plate.

[0008] Preferably, a locking pin is fixedly mounted on the outer surface of the metal plate, and the locking pin is inserted into a locking hole between overlapping parts formed by telescopic movement of two adjacent hollow frames.

[0009] Preferably, the first adjusting component includes a first electric cylinder, the tail end of which is fixed to the outer wall of the third hollow frame, and the telescopic end is fixed to the outer wall of the first hollow frame; the second adjusting component includes a second electric cylinder, the tail end of which is fixed to the outer wall of the fourth hollow frame, and the telescopic end is fixed to the outer wall of the second hollow frame; the third adjusting component includes a third electric cylinder, the tail end of which is fixed to the outer wall of the fourth hollow frame, and the telescopic end is fixed to the outer wall of the third hollow frame, the first electric cylinder adjusts the sliding of the first hollow frame; the second electric cylinder adjusts the sliding of the second hollow frame; the third electric cylinder adjusts the sliding of the third hollow frame.

[0010] Preferably, the first electric cylinder, the second electric cylinder and the third electric cylinder are all servo electric cylinders.

[0011] Preferably, ladders are also installed in the inner cavities of the first hollow frame, the second hollow frame, the third hollow frame and the fourth hollow frame. The ladders are configured to have a structure with multiple grooves formed at equal intervals along the length direction on the bottom surface of the hollow frame. The ladders constitute a maintenance passage for workers performing maintenance operations.

[0012] Preferably, a method for using a tower crane with height adjustment capability comprises the following steps: A. When the crane hook height needs to be adjusted, the first electric cylinder, the second electric cylinder and the third electric cylinder are controlled to work; B. The first electric cylinder drives the first hollow frame to extend from the second hollow frame; the second electric cylinder drives the second hollow frame to extend from the third hollow frame; the third electric cylinder drives the third hollow frame to extend from the fourth hollow frame to achieve height adjustment; C. When extended to the use height, the electric locking assembly is controlled to work and the two adjacent hollow frames are locked and fixed; D. Finally, the staff will carry out the lifting operation.

[0013] Preferably, the working process of the electric locking assembly is as follows: a. When current is applied to the magnetic plate, the magnetic plate becomes magnetic, the spring is compressed, the metal plate is attracted by the metal magnetic plate, the locking pin moves with the metal plate and away from the locking hole, and the hollow frame can perform telescopic movement; b. When no current is applied to the magnetic plate, the magnetic plate has no magnetism and no longer attracts the metal plate. The elasticity of the spring is restored and it moves forward. At this time, the metal plate moves toward the locking hole. The locking pin is inserted and fastened to the locking hole formed by the overlapping part between one hollow frame and another hollow frame, so that multiple hollow frames can be firmly fixed in the position raised by the telescopic movement. Beneficial Effects

[0014] (1) The present invention has a novel structural design and a simple working principle. The height of the tower body is adjusted by changing the relative positions of the hollow frames by telescopic means. The lifting arm composed of a telescopic hollow boom is used to replace the luffing trolley to adjust the position of the hook. The adjustment efficiency is high and the safety is high.

[0015] (2) The electric cylinder used in the present invention is used as a driving component, and the servo motor inside it can provide high-precision speed and torque control, making the movement of the electric cylinder more precise and improving the adjustment efficiency and stability.

[0016] (3) The electric locking assembly used in the present invention achieves locking and fixing of the hollow frame by driving the locking pin to move through the movement of the magnetic plate. After locking, the hollow frame has good stability and firmness, thereby further improving safety.

[0017] The above description is only an overview of the technical solution of the embodiment of the present invention. In order to more clearly understand the technical means of the embodiment of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 A cross-sectional view of the electric locking device of the present invention when current is applied; Figure 3 is a cross-sectional view of the electric locking device of the present invention when no current is applied; Figure 4 It is a schematic diagram of the installation of the adjustment assembly of the present invention; Explanation of the accompanying drawings: hook 1, rope 2, first hollow frame 3, second hollow frame 4, third hollow frame 5, fourth hollow frame 6, shell 7, metal magnetic plate 8, metal plate 9, spring 10, locking pin 11, locking hole 12, first electric cylinder 13, second electric cylinder 14, third electric cylinder 15, ladder 16. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification, claims and accompanying drawings of the present invention are intended to cover non-exclusive inclusions.

[0022] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase "embodiments" in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0023] The directional words appearing in the following description are all directions shown in the drawings, and do not limit the specific structure of the present invention. For example, in the description of the present invention, the directions or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0024] In addition, the expressions of indicated directions such as the X direction, the Y direction, and the Z direction used to illustrate the operation and construction of the components of the present embodiment are not absolute but relative, and although these indications are appropriate when the components are in the positions shown in the figures, when these positions change, these directions should be interpreted differently to correspond to the changes.

[0025] In addition, the terms "first", "second", etc. in the description and claims of the present invention or the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, the "connection" or "connection" of a mechanical structure may refer to a physical connection. For example, the physical connection may be a fixed connection, such as a fixed connection through a fixing member, such as a fixed connection through a screw, bolt or other fixing member; the physical connection may also be a detachable connection, such as a mutual snap-on or snap-fit ​​connection; the physical connection may also be an integral connection, such as a connection formed by welding, bonding or integral molding. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0028] See also Figure 1-Figure 4 , the present invention discloses a tower crane with height adjustment capability, comprising a boom and a hook 1; The outer end of the boom is connected to the hook 1 through a suspension rope 2; The boom is composed of a first hollow frame 3, a second hollow frame 4, a third hollow frame 5, and a fourth hollow frame 6 to form a retractable boom; A first adjustment component is installed between the first hollow frame 3 and the second hollow frame 4; A second adjustment assembly is installed between the second hollow frame 4 and the third hollow frame 5; A third adjustment assembly is installed between the third hollow frame 5 and the fourth hollow frame 6 .

[0029] In the present invention, the first hollow frame 3, the second hollow frame 4, the third hollow frame 5, and the fourth hollow frame 6 all adopt polygonal cross-sections, and the internal volumes of the first hollow frame 3, the second hollow frame 4, the third hollow frame 5, and the fourth hollow frame 6 increase sequentially. The first hollow frame 3 is inserted into the second hollow frame 4, the second hollow frame 4 is inserted into the third hollow frame 5, and the third hollow frame 5 is inserted into the fourth hollow frame 6. Embodiment 1;

[0030] The present invention also includes an electric locking assembly, which is installed on the outer walls of the first hollow frame 3, the second hollow frame 4, the third hollow frame 5, and the fourth hollow frame 6. The electric locking assembly includes an outer shell 7, a metal magnetic plate 8, a metal plate 9 and a spring 10. The outer shell 7 is installed on the outer surface of the hollow frame, and the metal magnetic plate 8 is fixedly attached to the inside of the outer shell 7 and is magnetic when current passes through; the metal plate 9 is installed inside the outer shell 7 and moves up and down along the inside of the outer shell 7, and the spring 10 is installed between the metal magnetic plate 8 and the metal plate 9; a locking pin 11 is also fixedly installed on the outer surface of the metal plate 9, and the locking pin 11 is inserted into a locking hole 12 between the overlapping parts formed by the telescopic movement of two adjacent hollow frames.

[0031] The electric locking assembly workflow is as follows: a. When current is applied to the magnetic plate, the magnetic plate becomes magnetic, the spring is compressed, the metal plate is attracted by the metal magnetic plate, the locking pin moves with the metal plate and away from the locking hole, and the hollow frame can perform telescopic movement; b. When no current is applied to the magnetic plate, the magnetic plate has no magnetism and no longer attracts the metal plate. The elasticity of the spring is restored and it moves forward. At this time, the metal plate moves toward the locking hole. The locking pin is inserted and fastened to the locking hole formed by the overlapping part between one hollow frame and another hollow frame, so that multiple hollow frames can be firmly fixed in the position raised by the telescopic movement.

[0032] The electric locking assembly adopted by the present invention realizes locking and fixing of the hollow frame by driving the movement of the locking pin through the movement of the magnetic plate. After locking, the hollow frame has good stability and firmness, and the safety is further improved. Embodiment 2:

[0033] The first adjustment component in the present invention includes a first electric cylinder 13, the tail end of the first electric cylinder 13 is fixed to the outer wall of the third hollow frame 5, and the telescopic end is fixed to the outer wall of the first hollow frame 3; the second adjustment component includes a second electric cylinder 14, the tail end of the second electric cylinder 14 is fixed to the outer wall of the fourth hollow frame 6, and the telescopic end is fixed to the outer wall of the second hollow frame 4; the third adjustment component includes a third electric cylinder 15, the tail end of the third electric cylinder 15 is fixed to the outer wall of the fourth hollow frame 6, and the telescopic end is fixed to the outer wall of the third hollow frame 5, the first electric cylinder 13 adjusts the sliding of the first hollow frame 3; the second electric cylinder 14 adjusts the sliding of the second hollow frame 4; the third electric cylinder 15 adjusts the sliding of the third hollow frame 5; the first electric cylinder 13, the second electric cylinder 14, and the third electric cylinder 15 are all servo electric cylinders. The electric cylinder used in the present invention is used as a driving component, and the servo motor inside it can provide high-precision speed and torque control, so that the movement of the electric cylinder is more accurate, and the adjustment efficiency and stability are improved. Embodiment three;

[0034] In the present invention, a ladder 16 is also installed in the inner cavity of the first hollow frame 3, the second hollow frame 4, the third hollow frame 5, and the fourth hollow frame 6. The ladder 16 is configured to have a structure with multiple grooves formed at equal intervals along the length direction on the bottom surface of the hollow frame, which can prevent the ladder structure from being interfered with. The ladder constitutes a maintenance passage for workers performing maintenance operations.

[0035] Working principle: A method for using a tower crane with height adjustment capability comprises the following steps: A. When the crane hook height needs to be adjusted, the first electric cylinder, the second electric cylinder and the third electric cylinder are controlled to work; B. The first electric cylinder drives the first hollow frame to extend from the second hollow frame; the second electric cylinder drives the second hollow frame to extend from the third hollow frame; the third electric cylinder drives the third hollow frame to extend from the fourth hollow frame to achieve height adjustment; C. When extended to the use height, the electric locking assembly is controlled to work and the two adjacent hollow frames are locked and fixed; D. Finally, the staff will carry out the lifting operation.

[0036] In summary, the present invention has novel structural design and simple working principle. The height of the tower body is adjusted by changing the relative positions of the hollow frames through telescopic movement. The lifting arm composed of a telescopic hollow boom is used to replace the luffing trolley to adjust the hook position, which has high adjustment efficiency and high safety.

[0037] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tower crane with height adjustment capability, characterized in that: comprising a lifting arm and a hook (1); The outer end of the boom is connected to the hook (1) via a lifting rope (2); The lifting arm is composed of a first hollow frame (3), a second hollow frame (4), a third hollow frame (5), and a fourth hollow frame (6) to form a retractable lifting arm; A first adjustment component is installed between the first hollow frame (3) and the second hollow frame (4); A second adjustment component is installed between the second hollow frame (4) and the third hollow frame (5); A third adjustment component is installed between the third hollow frame (5) and the fourth hollow frame (6).

2. A tower crane with height adjustment capability according to claim 1, characterized in that: The first hollow frame (3), the second hollow frame (4), the third hollow frame (5), and the fourth hollow frame (6) all have polygonal cross-sections; the internal volumes of the first hollow frame (3), the second hollow frame (4), the third hollow frame (5), and the fourth hollow frame (6) increase in sequence; the first hollow frame (3) is inserted into the second hollow frame (4), the second hollow frame (4) is inserted into the third hollow frame (5), and the third hollow frame (5) is inserted into the fourth hollow frame (6).

3. A tower crane with height adjustment capability according to claim 1, characterized in that: The invention also comprises an electric locking assembly, which is mounted on the outer walls of the first hollow frame (3), the second hollow frame (4), the third hollow frame (5) and the fourth hollow frame (6). The electric locking assembly comprises a shell (7), a metal magnetic plate (8), a metal plate (9) and a spring (10). The shell (7) is mounted on the outer surface of the hollow frame. The metal magnetic plate (8) is fixedly attached to the inside of the shell (7) and is magnetic when current passes through it. The metal plate (9) is mounted inside the shell (7) and moves up and down along the inside of the shell (7). The spring (10) is mounted between the metal magnetic plate (8) and the metal plate (9).

4. A tower crane with height adjustment capability according to claim 3, characterized in that: A locking pin (11) is also fixedly mounted on the outer surface of the metal plate (9), and the locking pin (11) is inserted into a locking hole (12) between overlapping portions formed by telescopic movement of two adjacent hollow frames.

5. A tower crane with height adjustment capability according to claim 1, characterized in that: The first adjustment component comprises a first electric cylinder (13), the tail end of the first electric cylinder (13) being fixed to the outer wall of the third hollow frame (5), and the telescopic end being fixed to the outer wall of the first hollow frame (3); the second adjustment component comprises a second electric cylinder (14), the tail end of the second electric cylinder (14) being fixed to the outer wall of the fourth hollow frame (6), and the telescopic end being fixed to the outer wall of the second hollow frame (4); the third adjustment component comprises a third electric cylinder (15), the tail end of the third electric cylinder (15) being fixed to the outer wall of the fourth hollow frame (6), and the telescopic end being fixed to the outer wall of the third hollow frame (5); the first electric cylinder (13) adjusting the sliding of the first hollow frame (3); the second electric cylinder (14) adjusting the sliding of the second hollow frame (4); and the third electric cylinder (15) adjusting the sliding of the third hollow frame (5).

6. A tower crane with height adjustment capability according to claim 5, characterized in that: The first electric cylinder (13), the second electric cylinder (14) and the third electric cylinder (15) are all servo electric cylinders.

7. A tower crane with height adjustment capability according to claim 1, characterized in that: A ladder (16) is also installed in the inner cavity of the first hollow frame (3), the second hollow frame (4), the third hollow frame (5), and the fourth hollow frame (6). The ladder (16) is configured to have a structure with a plurality of grooves formed at equal intervals along the length direction on the bottom surface of the hollow frame. The ladder constitutes a maintenance passage for operators performing maintenance operations.

8. A method for using a tower crane with height adjustment capability as claimed in claim 1, characterized in that: The following steps are involved: A. When the crane hook height needs to be adjusted, the first electric cylinder, the second electric cylinder and the third electric cylinder are controlled to work; B. The first electric cylinder drives the first hollow frame to extend from the second hollow frame; the second electric cylinder drives the second hollow frame to extend from the third hollow frame; the third electric cylinder drives the third hollow frame to extend from the fourth hollow frame to achieve height adjustment; C. When extended to the use height, the electric locking assembly is controlled to work and the two adjacent hollow frames are locked and fixed; D. Finally, the staff will carry out the lifting operation.

9. A method for using a tower crane with height adjustment capability according to claim 8, characterized in that: The electric locking assembly workflow is as follows: a. When current is applied to the magnetic plate, the magnetic plate becomes magnetic, the spring is compressed, the metal plate is attracted by the metal magnetic plate, the locking pin moves with the metal plate and away from the locking hole, and the hollow frame can perform telescopic movement; b. When no current is applied to the magnetic plate, the magnetic plate has no magnetism and no longer attracts the metal plate. The elasticity of the spring is restored and it moves forward. At this time, the metal plate moves toward the locking hole. The locking pin is inserted and fastened to the locking hole formed by the overlapping part between one hollow frame and another hollow frame, so that multiple hollow frames can be firmly fixed in the position raised by the telescopic movement.

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