Movable arm type tower crane

Abstract

The utility model relates to the technical field of tower cranes, and discloses a movable arm type tower crane, which comprises a tower body, a cargo boom, a balance arm, a counterweight component and a driving component, one end of the cargo boom along the length direction is rotatably connected to the tower body, one end of the balance arm along the length direction is fixedly connected to one end of the cargo boom connected with the tower body, and the counterweight component is connected with the driving component. The end, away from the cargo boom, of the balance arm in the length direction is provided with an extending part, the extending part extends by a preset distance in the length direction of the balance arm, a bearing space is formed in the side, back to the side where the tower body is located, of the extending part, the balance weight assembly is connected with the balance arm and arranged in the bearing space, and the driving assembly is connected with the tower body and the cargo boom. The driving assembly is used for driving the cargo boom to change the amplitude, when the driving assembly drives the cargo boom to change the amplitude, the balance arm and the counterweight assembly can move along with the cargo boom, the gravity center position of the tower crane can be adjusted in real time, the torque generated by the cargo boom due to amplitude change and heavy object hoisting is effectively balanced, and the risk that the tower crane overturns in the working process is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of tower cranes, and more specifically, relates to a luffing jib tower crane. Background Technology

[0002] Luffing jib tower cranes can adjust their working range by changing the boom's amplitude. In related technologies, the position and angle of the counterweight boom of a luffing jib tower crane are usually fixed. When the boom is luffed, the angle of the counterweight boom cannot keep up with the change, which will cause a large shift in the center of gravity of the tower crane. This shift in the center of gravity will cause the tower crane to bear a large unbalanced moment during operation, increasing the risk of the tower crane overturning. Utility Model Content

[0003] The main purpose of this utility model is to provide a luffing jib tower crane with a relatively low risk of overturning.

[0004] According to a first aspect of the present invention, a luffing jib tower crane is provided, comprising a tower body, a lifting jib, a counterweight jib, a counterweight assembly, and a drive assembly. One end of the lifting jib along its length is rotatably connected to the tower body. One end of the counterweight jib along its length is fixedly connected to the end of the lifting jib connected to the tower body. The end of the counterweight jib along its length away from the lifting jib has an extension portion extending a predetermined distance along the length of the counterweight jib. The side of the extension portion facing away from the tower body forms a bearing space. The counterweight assembly is connected to the counterweight jib and is disposed in the bearing space. The drive assembly connects the tower body and the lifting jib, and is used to drive the lifting jib to luff.

[0005] In a specific embodiment of this utility model, the length direction of the counterweight arm intersects with the length direction of the lifting arm, and when the lifting arm is set horizontally, the counterweight arm extends upward at an angle.

[0006] In a specific embodiment of this utility model, when the lifting arm is set horizontally, the tilt angle of the counterweight arm is 8°-25°.

[0007] In a specific embodiment of the present invention, the counterweight assembly includes a counterweight block, and the number of the counterweight blocks is multiple, with the multiple counterweight blocks connected to the balance arm;

[0008] When the lifting arm is set horizontally, a plurality of counterweights are stacked upward in the bearing space and along the vertical direction. The counterweight closest to the extension is the first counterweight and the first counterweight is in contact with the extension.

[0009] In a specific embodiment of this utility model, the counterweight arm has a first connecting ear, which is disposed at one end of the counterweight arm away from the lifting arm along its length direction, and the first connecting ear is located within the bearing space.

[0010] The counterweight has a second connecting lug and a third connecting lug, and the second connecting lug and the third connecting lug are spaced apart.

[0011] The luffing jib tower crane also includes a pin assembly, and there are multiple pin assemblies. Each counterweight is connected to the counterweight boom through a pin assembly. The first connecting lug is inserted between the second connecting lug and the third connecting lug, and the pin assembly connects the second connecting lug, the first connecting lug, and the third connecting lug.

[0012] In a specific embodiment of this utility model, the tower body includes a tower body and a mounting frame. The tower body extends vertically, and the mounting frame includes a rotary turntable, a frame body, and a connecting rod. The rotary turntable is rotatably connected to the top of the tower body. The frame body has two symmetrically arranged parts, which are connected by the connecting rod. The frame body is triangular and has a first corner, a second corner, and a third corner. The first corner and the second corner are both connected to the top side of the rotary turntable, and the third corner is located above the first corner and the second corner.

[0013] The crane boom is rotatably connected to the third corner.

[0014] In a specific embodiment of this utility model, the drive assembly includes a drive member, which includes a cylinder and a drive rod. The cylinder has a first end and a second end opposite to each other. The drive rod is disposed within the cylinder and extends from the second end to the outside of the cylinder.

[0015] The first end is rotatably connected to the rotary table, and the end of the drive rod away from the first end along its length direction is rotatably connected to the lifting arm. Along the length direction of the lifting arm, the connection point between the drive rod and the lifting arm and the counterweight arm are located on opposite sides of the third corner. The lifting arm achieves luffing by extending and retracting the drive rod.

[0016] In a specific embodiment of this utility model, the driving component is an electric cylinder or a hydraulic cylinder.

[0017] In a specific embodiment of this utility model, the third corner portion is located directly above the first corner portion;

[0018] The mounting frame also includes a hinge seat, which is connected to the rotary table and located between the second corners of the two frames. The first end is rotatably connected to the hinge seat.

[0019] In a specific embodiment of this utility model, the luffing jib tower crane further includes a hoisting mechanism connected to the jib.

[0020] One of the above-described technical solutions of this utility model has at least one of the following advantages or beneficial effects:

[0021] The luffing jib tower crane of this invention has a counterweight boom and a lifting jib fixedly connected. Therefore, when the drive assembly drives the lifting jib to change its luffing angle, the counterweight boom and the counterweight assembly move together with the lifting jib, which can adjust the center of gravity of the tower crane in real time and effectively balance the torque generated by the lifting jib due to luffing and the load, reducing the risk of the tower crane overturning during operation. In addition, the counterweight boom has an extension, and the side of the extension facing away from the tower body forms a load-bearing space. The counterweight assembly is located in the load-bearing space. Therefore, when the counterweight boom moves together with the lifting jib, the counterweight assembly will not touch the tower body, and the lifting jib has a larger luffing angle. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0023] Figure 1 This is a structural diagram of a luffing jib tower crane according to an embodiment of this utility model;

[0024] Figure 2 This is an embodiment of the present utility model. Figure 1 A magnified view of A in the middle;

[0025] Figure 3 This is a structural diagram of the cooperation between the balance arm and the counterweight assembly in an embodiment of this utility model;

[0026] Figure 4 This is a schematic diagram of the connection between the balance arm and the counterweight in an embodiment of this utility model;

[0027] Figure 5 This is a structural diagram of a luffing tower crane with its boom raised according to an embodiment of this utility model;

[0028] Figure 6 This is an embodiment of the present utility model. Figure 4 A magnified view of B in the middle.

[0029] In the diagram, 1. Tower body; 11. Tower main body; 12. Rotary turntable; 13. Frame; 131. First corner; 132. Second corner; 133. Third corner; 14. Connecting rod; 15. Hinge seat; 2. Lifting boom; 3. Counterweight boom; 31. Extension; 32. First connecting ear; 4. Counterweight assembly; 41. Counterweight block; 41A. First counterweight block; 411. Second connecting ear; 412. Third connecting ear; 5. Drive assembly; 51. Drive component; 511. Cylinder; 511A. First end; 511B. Second end; 512. Drive rod; 6. Pin assembly; 7. Lifting mechanism; 100. Bearing space. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] Reference Figures 1 to 6 As shown, a preferred embodiment of the present invention provides a luffing tower crane, comprising a tower body 1, a lifting boom 2, a counterweight boom 3, a counterweight assembly 4, and a drive assembly 5. One end of the lifting boom 2 along its length is rotatably connected to the tower body 1. One end of the counterweight boom 3 along its length is fixedly connected to the end of the lifting boom 2 connected to the tower body 1. The end of the counterweight boom 3 away from the lifting boom 2 along its length has an extension 31, which extends a predetermined distance along the length of the counterweight boom 3. The side of the extension 31 facing away from the tower body 1 forms a bearing space 100. The counterweight assembly 4 is connected to the counterweight boom 3 and is disposed in the bearing space 100. The drive assembly 5 connects the tower body 1 and the lifting boom 2 and is used to drive the lifting boom 2 to change its amplitude.

[0032] Specifically, in the luffing tower crane of this application, the counterweight boom 3 is fixedly connected to the lifting boom 2. Therefore, when the drive assembly 5 drives the lifting boom 2 to change its amplitude, the counterweight boom 3 and the counterweight assembly 4 will move together with the lifting boom 2, which can adjust the center of gravity of the tower crane in real time and effectively balance the torque generated by the lifting boom 2 due to the amplitude change and the load, reducing the risk of the tower crane overturning during operation. In addition, the counterweight boom 3 has an extension 31, and the side of the extension 31 facing away from the tower body 1 forms a bearing space 100. The counterweight assembly 4 is disposed in the bearing space 100. Therefore, when the counterweight boom 3 moves together with the lifting boom 2, the counterweight assembly 4 will not touch the tower body 1, and the lifting boom 2 has a larger amplitude change angle.

[0033] Furthermore, the length direction of the counterweight boom 3 intersects the length direction of the lifting boom 2. When the lifting boom 2 is set horizontally, the counterweight boom 3 extends upward at an angle. Therefore, when the lifting boom 2 is tilted up under the action of the drive component 5, the counterweight boom 3 is less likely to hit the tower body 1. Based on this, the lifting boom 2 has a larger amplitude angle. After the lifting boom 2 is tilted up, it can rotate freely in a narrow space, which is suitable for dense building conditions.

[0034] In this embodiment, when the lifting arm 2 is set horizontally, the tilt angle of the counterweight arm 3 is 8°-25°. The counterweight arm 3 meets this tilt angle, has a simple structure, and is easy to install the counterweight assembly 4; preferably, the tilt angle of the counterweight arm 3 is 10°.

[0035] In this embodiment, the counterweight assembly 4 includes multiple counterweight blocks 41, which are connected to the counterweight arm 3. When the lifting arm 2 is horizontally positioned, the multiple counterweight blocks 41 are stacked upwards in the bearing space 100 and arranged vertically. The counterweight block 41 closest to the extension 31 is the first counterweight block 41A, which contacts the extension 31. This type of counterweight assembly 4 has a simple structure, is easy to install, and can be stably arranged in the bearing space 100.

[0036] In this embodiment, the counterweight boom 3 has a first connecting ear 32, which is located at one end of the counterweight boom 3 away from the lifting boom 2 along its length direction, and the first connecting ear 32 is located within the bearing space 100; the counterweight block 41 has a second connecting ear 411 and a third connecting ear 412, which are spaced apart; the luffing jib tower crane also includes a pin assembly 6, which is multiple in number, and each counterweight block 41 is connected to the counterweight boom 3 through a pin assembly 6, wherein the first connecting ear 32 is inserted between the second connecting ear 411 and the third connecting ear 412, and the pin assembly 6 connects the second connecting ear 411 and the third connecting ear 412. The first connecting ear 32 and the third connecting ear 412 connect the balance arm 3 and the counterweight 41 via the pin assembly 6. The operation is simple, efficient, safe and quick. The pin assembly 6 includes a pin and a cotter pin. The pin passes through the second connecting ear 411, the first connecting ear 32 and the third connecting ear 412. The cotter pin is connected to one end of the pin along its length. The connection method between the cotter pin and the pin is prior art and will not be described in detail in this application. In addition, according to practical applications, the pin assembly 6 may also include an annular limiting member. The limiting member is sleeved on the pin, and the cotter pin passes through the limiting member and the pin to make the connection between the pin assembly 6, the balance arm 3 and the counterweight 41 more stable.

[0037] In this embodiment, the tower body 1 includes a tower body 11 and a mounting frame. The tower body 11 extends vertically. The mounting frame includes a rotary turntable 12, a frame 13, and a connecting rod 14. The rotary turntable 12 is rotatably connected to the top of the tower body 11. The frame 13 has two symmetrically arranged parts, which are connected by the connecting rod 14. The frame 13 is triangular and has a first corner 131, a second corner 132, and a third corner 133. The first corner 131 and the second corner 132 are both connected to the top side of the rotary turntable 12, and the third corner 133 is located above the first corner 131 and the second corner 132. The lifting arm 2 is rotatably connected to the third corner 133. Specifically, the frame 13 is triangular, which has the advantages of simple structure, convenient processing, and the ability to reasonably transfer the force on the lifting arm 2 to the tower body 11, making it safe and reliable.

[0038] It should be noted that the slewing turntable 12 is driven to rotate by a motor in conjunction with a transmission assembly, enabling the luffing jib tower crane to rotate freely 360 degrees in the horizontal plane. This is existing technology and will not be elaborated on in this application. The number of connecting rods 14 can be multiple, depending on the actual application, and this application does not limit this.

[0039] In this embodiment, the drive assembly 5 includes a drive member 51, which includes a cylinder 511 and a drive rod 512. The cylinder 511 has a first end 511A and a second end 511B. The drive rod 512 is disposed inside the cylinder 511 and extends from the second end 511B to the outside of the cylinder 511. The first end 511A is rotatably connected to the rotary table 12, and the end of the drive rod 512 away from the first end 511A along its length is rotatably connected to the lifting boom 2. The lifting boom 2 achieves luffing by extending and retracting through the drive rod 512, which is simple to operate, safe and efficient, and along the length of the lifting boom 2... The connection between the drive rod 512 and the lifting arm 2, and the balance arm 3 are located on opposite sides of the third corner 133, so that the drive component 51 can smoothly drive the lifting arm 2 to change amplitude, and the structure is stable and reliable. Specifically, the first end 511A of the cylinder 511 is connected to the rotary table 12. At this time, the rotary table 12 directly serves as a force-bearing component. Since the rotary table 12 has a relatively large and uniform structure, as a force-bearing component, the force can be more evenly distributed on the entire rotary table 12. Compared with concentrating the force on a smaller component, this method can effectively reduce the phenomenon of local stress concentration, and the structure is safe and reliable.

[0040] In this embodiment, the driving component 51 is a hydraulic cylinder, and the driving rod 512 is a piston rod. In other embodiments, the driving component 51 is an electric cylinder, and the driving rod 512 is a push rod. Specifically, the electric cylinder also includes a motor and a transmission mechanism. The power output by the motor is transmitted to the push rod through the transmission mechanism to drive the push rod to extend and retract, thereby realizing the luffing of the lifting boom. The important component of the transmission mechanism is a lead screw pair, which is connected to the push rod. The lead screw pair converts the rotational motion of the motor into the linear motion of the push rod.

[0041] It should be noted that hydraulic cylinders and electric cylinders are both existing technologies, and this application will not elaborate on them further.

[0042] Furthermore, the third corner 133 is located directly above the first corner 131. At this time, the frame 13 is in the shape of an equilateral triangle, which is simple to bear force and easy to design. The mounting frame also includes a hinge seat 15, which is connected to the rotary table 12 and is located between the second corners 132 of the two frames 13. The first end 511A is rotatably connected to the hinge seat 15. At this time, the drive unit 51 is located between the two frames 13, which is compact and can stably support the lifting arm 2.

[0043] In this embodiment, the luffing jib tower crane also includes a hoisting mechanism 7, which is connected to the jib 2. The luffing jib tower crane uses the hoisting mechanism 7 to lift heavy objects. The hoisting mechanism 7 includes a motor, a drum, and a hoisting rope. The motor drives the drum to unwind and rewind the hoisting rope to lift heavy objects. The hoisting mechanism 7 is existing technology, and this application will not elaborate on it further.

[0044] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A luffing jib tower crane, characterized in that, The system includes a tower body (1), a lifting boom (2), a counterweight boom (3), a counterweight assembly (4), and a drive assembly (5). One end of the lifting boom (2) is rotatably connected to the tower body (1) along its length direction. One end of the counterweight boom (3) is fixedly connected to the end of the lifting boom (2) connected to the tower body (1) along its length direction. The end of the counterweight boom (3) away from the lifting boom (2) along its length direction has an extension (31). The extension (31) extends a predetermined distance along the length direction of the counterweight boom (3). The side of the extension (31) facing away from the tower body (1) forms a bearing space (100). The counterweight assembly (4) is connected to the counterweight boom (3) and is located in the bearing space (100). The drive assembly (5) connects the tower body (1) and the lifting boom (2) and is used to drive the lifting boom (2) to change amplitude.

2. A jib tower crane according to claim 1, characterized in that The length direction of the counterweight arm (3) intersects the length direction of the lifting arm (2). When the lifting arm (2) is set horizontally, the counterweight arm (3) extends upward at an angle.

3. A jib tower crane according to claim 2, characterized in that When the lifting arm (2) is set horizontally, the tilt angle of the counterweight arm (3) is 8°-25°.

4. A jib tower crane according to claim 1, characterized in that The counterweight assembly (4) includes a counterweight block (41), and there are multiple counterweight blocks (41), which are connected to the balance arm (3). When the lifting arm (2) is set horizontally, a plurality of counterweights (41) are stacked upward in the bearing space (100), and in the vertical direction, the counterweight (41) closest to the extension (31) is the first counterweight (41A), and the first counterweight (41A) is in contact with the extension (31).

5. A jib tower crane according to claim 4, characterized in that The counterweight arm (3) has a first connecting ear (32), which is located at one end of the counterweight arm (3) away from the lifting arm (2) along its length direction, and the first connecting ear (32) is located within the bearing space (100); The counterweight (41) has a second connecting lug (411) and a third connecting lug (412), and the second connecting lug (411) and the third connecting lug (412) are spaced apart; The luffing jib tower crane also includes a pin assembly (6), and there are multiple pin assemblies (6). Each counterweight (41) is connected to the counterweight boom (3) through a pin assembly (6). The first connecting ear (32) is inserted between the second connecting ear (411) and the third connecting ear (412). The pin assembly (6) connects the second connecting ear (411), the first connecting ear (32), and the third connecting ear (412).

6. The jib tower crane of claim 1, wherein, The tower body (1) includes a tower body (11), a rotary turntable (12), a frame (13), and a connecting rod (14). The tower body (11) extends vertically. The rotary turntable (12) is rotatably connected to the top of the tower body (11). The frame (13) has two symmetrically arranged parts, which are connected by the connecting rod (14). The frame (13) is triangular and has a first corner (131), a second corner (132), and a third corner (133). The first corner (131) and the second corner (132) are connected to the top side of the rotary turntable (12), and the third corner (133) is located above the first corner (131) and the second corner (132). The lifting arm (2) is rotatably connected to the third corner (133).

7. The luffing jib tower crane according to claim 6, characterized in that, The drive assembly (5) includes a drive member (51), which includes a cylinder (511) and a drive rod (512). The cylinder (511) has a first end (511A) and a second end (511B) opposite to each other. The drive rod (512) is disposed inside the cylinder (511) and extends from the second end (511B) to the outside of the cylinder (511). The first end (511A) is rotatably connected to the rotary table (12), and the end of the drive rod (512) away from the first end (511A) along its length direction is rotatably connected to the lifting arm (2). Along the length direction of the lifting arm (2), the connection between the drive rod (512) and the lifting arm (2) and the balance arm (3) are located on opposite sides of the third corner (133). The lifting arm (2) achieves amplitude variation through the extension and retraction of the drive rod (512).

8. A jib tower crane according to claim 7, characterized in that The drive component (51) is an electric cylinder or a hydraulic cylinder.

9. A jib tower crane according to claim 7, characterized in that The third corner (133) is located directly above the first corner (131); The tower body (1) also includes a hinge seat (15), which is connected to the rotary table (12) and is located between the second corners (132) of the two frames (13). The first end (511A) is rotatably connected to the hinge seat (15).

10. A jib tower crane according to claim 1, characterized in that The luffing jib tower crane also includes a hoisting mechanism (7), which is connected to the jib (2).

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