crane

Abstract

The present application belongs to the technical field of construction machinery, and particularly relates to a crane. A vertical column is vertically arranged on a base, and a cantilever-shaped extending hoist arm is connected to the upper end of the vertical column. The hoist arm rotates around the shaft center of the vertical column. A winch is arranged on the base. A traction rope wound on a winding drum of the winch is led out, turns around a deflecting pulley, and is arranged to be hung down from the suspension end of the hoist arm along the vertical column from bottom to top and along the hoist arm from inside to outside. The base of the crane can be stably installed on the top of a tower drum and provides a reliable installation platform for the hoist arm. The hoist arm can rotate around the vertical column to above each threading hole, and the traction operation of the whole bundle of prestressed tendons is safely and reliably realized, which significantly improves the construction efficiency and reduces the construction cost.

Description

Technical Field

[0001] The invention belongs to the technical field of construction machinery, and in particular relates to a crane. Background Art

[0002] The concrete cylinder of a wind turbine tower is typically prefabricated in sections and hoisted at the construction site. After hoisting, prestressed tendons are arranged circumferentially around the cylinder to apply prestress to the assembled tower, improving its bending resistance. The tendons are pulled from the bottom of the tower to the top of the assembled cylinder using lifting machinery. Each bundle of tendons consists of multiple steel strands, can be up to 100 meters long, and weighs two tons. The installation space at the top of the assembled cylinder is limited, making it impossible to reliably secure a high-power winch to pull the entire bundle of tendons. Currently, the following two methods are commonly used to achieve this:

[0003] 1. After arranging the steel strands into bundles on the ground, use a large tower crane to lift one end of the strand to the top of the assembled cylinder. The occupation of the large tower crane will affect the overall construction efficiency.

[0004] 2. Install a winch on the top surface of the assembled cylinder, lift the single steel strands one by one and then arrange them into bundles. This requires lifting a total of 200 to 300 steel strands. The operation efficiency is low and it is difficult to bundle the steel strands, which makes it easy for the steel strands to get tangled. Summary of the Invention

[0005] The object of the present invention is to provide a crane which can be reliably fixed on the top of a tower and realizes high-efficiency hoisting of prestressed anchor cables.

[0006] To achieve the above objectives, the technical solution adopted in the present invention is: a crane, having a vertically arranged column on the base, the upper end of the column being connected to a cantilevered boom, the boom rotating around the axis of the column, a winch being arranged on the base, and the traction rope wound on the winding drum of the winch being led out and suspended downward from the bottom to the top along the column and from the inside to the outside along the boom at the suspended end of the boom.

[0007] Compared with the existing technology, the present invention has the following technical effects: the base of the crane can be stably installed on the top of the tower and provide a reliable installation platform for the boom. The boom can rotate around the column to above each cable hole, safely and reliably realizing the traction operation of the entire bundle of prestressed tendons, significantly improving construction efficiency and reducing construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The following is a brief description of the contents and symbols in the drawings of this specification:

[0009] Figure 1 It is a schematic diagram of the use state of the present invention;

[0010] Figure 2 This is a schematic diagram of Example 1 when installed on a concrete tower;

[0011] Figure 3 yes Figure 2 Schematic diagram of a top-down perspective;

[0012] Figure 4 is a schematic top view of the assembled state of Example 2;

[0013] Figure 5 This is a schematic front view of Example 2 in a disassembled state;

[0014] Figure 6 It is a three-dimensional schematic diagram of the disassembled state of Example 2.

[0015] In the figure: 10. Base, 11. Middle base, 12. Side base, 13. Main beam, 14. Secondary beam, 21. Column, 211. Upper fixed pulley, 212. Lower fixed pulley, 22. Boom, 221. Fixed pulley, 222. Tube, 223. Boom, 23. Bracket, 24. Support, 30. Winch, 31. Traction rope, 32. Reversing wheel, 41. Motor, 42. Gear, 43. Gear ring, 44. Support ring, 45. Roller. DETAILED DESCRIPTION

[0016] The specific implementation of the present invention will be further described in detail below through description of embodiments in conjunction with the accompanying drawings.

[0017] Example 1

[0018] A crane has a vertically arranged column 21 on a base 10, the upper end of the column 21 is connected to a cantilevered boom 22, and the boom 22 rotates around the axis of the column 21. A winch 30 is arranged on the base 10, and a traction rope 31 wound on the winding drum of the winch 30 is led out and hung downward along the column 21 from bottom to top, along the boom 22 from inside to outside, and at the suspended end of the boom 22.

[0019] As attached Figure 1-3 As shown, the cable holes 2 are typically arranged around the core of the concrete tower body 1. During use, the base 10 is mounted on the top of the concrete tower body 1 so that the axis of the column 21 coincides with the axis of the tower body 1. The extended length of the boom 22 matches the distance between the cable holes 2 reserved on the tower body 1 and the axis of the tower body 1. In this way, the traction rope 31 can be naturally suspended downward from the suspended end of the boom 22 and passed through the cable holes 2.

[0020] In this embodiment, the axis of the column 21 coincides with the center of the base 10. In this way, it is only necessary to ensure that the base 10 coincides with the axis of the tower body 1 when the crane is installed, so as to ensure that the axis of the column 21 coincides with the axis of the tower body 1. When in use, there is no need to adjust the length of the boom 22. Only by driving the boom 22 to rotate can the various cable holes 2 be matched to carry out the traction and lifting of the cable body.

[0021] The traction rope 31 is provided with traction by the winch 30. To ensure a reliable connection between the winch 30 and the base 10 and to balance the force applied to the base 10 during traction, a bracket 23 is provided in the middle of the base 10 in this embodiment. The column 21 is fixedly mounted on the top of the bracket 23, and the winch 30 is located beside the bracket 23. The traction rope 31 is drawn from the winding drum of the winch 30, extending in sequence along the vertical direction of the column 21 and along the length of the boom 22, and then passing over the fixed pulley 221 at the suspended end of the boom 22 to hang downward. The traction rope 31 can be attached to the outside of the column 21. When the boom 22 rotates, the traction rope 31 will twist or deflect circumferentially around the column 21, causing damage to the traction rope 31. Therefore, in this embodiment, the column 21 is a hollow pipe column, and upper and lower fixed pulleys 211 and 212 are respectively provided at its upper and lower ends. The traction rope 31 passes through the pipe hole of the column 21 and passes through the lower fixed pulley 212 and the upper fixed pulley 211 in sequence to reach the fixed pulley 221.

[0022] To further balance the force on the base 10, Figure 2 、 3 As shown, a reversing wheel 32 is provided on the base 10 , and the reversing wheel 32 and the winch 30 are symmetrically placed on the side of the lower end of the column 21 , and the traction rope 31 passes through the reversing wheel 32 , the lower fixed pulley 212 , the upper fixed pulley 211 and reaches the fixed pulley 221 in sequence.

[0023] In order to realize the rotational coordination between the boom 22 and the column 21, a vertically arranged tube 222 is connected to one end of the boom 22 in this embodiment. The lower section of the tube 222 and the upper section of the column 21 form a plug-in rotational coordination. A driving unit is provided between the boom 22 and the column 21 to drive the relative rotation of the two. Figure 2 As shown, the boom 22 is connected to a support 24 in a downwardly suspended manner, and the drive unit is arranged on the support 24. The support 24 is connected to the lower end of a suspension rod 223 arranged downwardly in the middle of the boom 22. In this embodiment, two suspension rods 223 are provided to connect the support 24 and the boom 22. A vertically arranged suspension rod 223 is provided on the side of the support 24 adjacent to the column 21, and a suspension rod 223 is provided on the side of the support 24 away from the column 21, which is obliquely suspended from top to bottom toward the side where the column 21 is located. The drive unit includes a motor 41. A support ring 44 is provided on the column 21, and a roller 45 is correspondingly provided on the support 24. The roller 45 and the support ring 44 form a rolling fit. The motor 41 drives the roller 45 to roll around the ring surface of the support ring 44, thereby driving the boom 22 to rotate around the column 21.

[0024] In order to prevent the traction rope 31 from twisting when the boom 22 rotates, the upper fixed pulley 211 is connected to the upper end of the tube body 222 and rotates synchronously with the tube body 222. The wheel cores of the upper fixed pulley 211 and the lower fixed pulley 212 are horizontal and parallel to each other, and perpendicular to the length direction of the boom 22.

[0025] As attached Figure 3 As shown, the base 10 is generally in the shape of a polygonal plate and includes a main beam 13 located in the middle, extending outward at both ends to connect to the tower body 1. A secondary beam 14 is connected to the main beam 13 and extends outward to connect to the tower body 1. The main beam 13 and the secondary beam 14 are arranged vertically. The two ends of the main beam 13 are connected to the tower body 1. In this embodiment, the centerline connecting the columns 21, the hoist 30, and the reversing pulley 32 is parallel to the main beam 13 and located between the two main beams 13, which further enhances the reliability of the crane structure.

[0026] Example 2

[0027] The difference between this embodiment and embodiment 1 is that the base 10 is composed of several detachably connected base bodies, which is convenient for the transportation of the crane. The hoist 30, bracket 23 and reversing wheel 32 are fixedly installed on the same base body. Figure 4-6 As shown, the base 10 includes a central base body 11 in the shape of a strip plate. The side base bodies 12 are symmetrically arranged on both sides of the central base body 11. The winch 30, the bracket 23 and the reversing wheel 32 are fixedly installed on the central base body 11. When transporting, Figure 5 As shown, the middle seat 11 and the two side seats 12 are separated. If the transport height is limited, the columns 21 and the brackets 23 can be further separated. Figure 6 As shown, two trapezoidal side seats 12 are symmetrically arranged on both sides of the middle seat 11, and the base 10 as a whole is in the shape of a regular polygonal plate.

[0028] The central base 11 includes a main beam 13 with both ends extending outward to connect to the tower shell 1. The inner side of the side base 12 is connected to the central base 11, and the outer side is connected to the tower shell 1 through an outward-extending secondary beam 14. The main beam 13 and the secondary beam 14 are arranged vertically to ensure a reliable connection between the crane and the tower shell 1. An auxiliary beam 15 is provided between the main beam 13 and the secondary beam 14. The auxiliary beam 15 is connected to the tower shell 1 via support legs 151 provided on the bottom surface of its end, which can reliably transfer the crane load to the tower shell 1.

[0029] In addition, in order to further prevent the boom 22 from rotating around the column 21 when the cable body is pulled, the embodiment is as shown in the attached Figure 5 As shown, in addition to the support ring 44 provided on the column 21 and the roller 45 on the support 24 being rolled and fitted, a ring gear 43 is also fixedly provided on the column 21 in a ring-shaped manner. The ring gear 43 meshes with the gear 42 connected to the rotating shaft of the motor 41. The rotation axis of the ring gear 43 coincides with the core of the column 21 and the tube body 222, and the rotation axis of the gear 42 is parallel to the rotation axis of the ring gear 43. This not only provides vertical support for the boom 22, but also limits the rotation of the gear 42 by locking the rotating shaft of the motor 41, thereby limiting the relative rotation of the boom 22 and the column 21, ensuring a stable connection between the boom 22 and the column 21 during traction operations.

Claims

1. A crane, characterized in that: The crane is fixed on the top of the tower to realize the hoisting of the prestressed anchor cable. The prestressed anchor cable is arranged through the cable hole of the tower core. The crane includes a base (10). A vertical column (21) is arranged on the base (10). The upper end of the column (21) is connected to a cantilevered boom (22). The boom (22) rotates around the axis of the column (21). A winch (30) is arranged on the base (10). The traction rope (31) wound on the winding drum of the winch (30) is led out and then hung down from the bottom to the top along the column (21) and from the inside to the outside along the boom (22) at the suspended end of the boom (22). The extension length of the boom matches the distance between the cable holes reserved on the tower body and the tower body axis. In this way, the traction rope can be naturally suspended downward from the suspension end of the boom and pass through the cable holes, so that the axis of the column and the tower body coincide. There is no need to adjust the length of the boom during use. Only the boom can be driven to rotate to match the cable holes for the lifting of the prestressed anchor cable. A bracket (23) is provided in the middle of the base (10), a column (21) is fixedly mounted on the top of the bracket (23), a winch (30) is located beside the bracket (23), a traction rope (31) is drawn out from a winding drum of the winch (30), and extends in the vertical direction of the column (21) and the length direction of the boom (22) in sequence and passes around a fixed pulley (221) at the suspension end of the boom (22) to be suspended downward; The column (21) is a hollow pipe column, and upper and lower fixed pulleys (211, 212) are respectively provided at its upper and lower ends. The traction rope (31) passes through the pipe hole of the column (21) and passes through the lower fixed pulley (212) and the upper fixed pulley (211) in sequence to reach the fixed pulley (221). A reversing wheel (32) is provided on the base (10), and the reversing wheel (32) and the winch (30) are symmetrically arranged on the side of the lower end of the column (21), and the traction rope (31) sequentially passes around the reversing wheel (32), the lower fixed pulley (212), the upper fixed pulley (211) and arrives at the fixed pulley (221); One end of the boom (22) is connected to a vertically arranged tube body (222), the lower section of the tube body (222) and the upper section of the column (21) form a plug-in rotation fit, and a drive unit for driving the boom (22) and the column (21) to rotate relative to each other is provided between the boom (22) and the column (21); The base (10) is composed of a plurality of detachably connected base bodies, and the winch (30), the bracket (23) and the reversing wheel (32) are fixedly mounted on the same base body; The base (10) includes a middle base body (11) that is in the shape of a strip plate as a whole, and side base bodies (12) are symmetrically arranged on both sides of the middle base body (11). The winch (30), the bracket (23) and the reversing wheel (32) are fixedly mounted on the middle base body (11); The base (10) is in the shape of a regular polygonal plate as a whole. The middle base body (11) includes a main beam (13) with both ends extending outwards and connected to the tower body (1). The inner side of the side base body (12) is connected to the middle base body (11), and the outer side is connected to the tower body (1) through a secondary beam (14) extending outwards. The main beam (13) and the secondary beam (14) are arranged vertically.

2. The crane according to claim 1, characterized in that: The boom (22) is connected to a support (24) in a downward hanging manner. A driving unit is provided on the support (24). The driving unit includes a motor (41). A ring gear (43) is fixedly provided on the column (21) in a hoop-like manner and meshes with a gear (42) connected to a rotating shaft of the motor (41). The axis of the ring gear (43) coincides with the column (21) and the core of the tube body (222), and the rotation axis of the gear (42) is parallel to the rotation axis of the ring gear (43).

3. The crane according to claim 2, characterized in that: A support ring (44) is provided on the side of the gear ring (43) and is sleeved on the column (21). A roller (45) is provided on the support (24). The roller (45) and the support ring (44) form a rolling fit.

4. The crane according to claim 3, wherein: The support (24) is connected to the lower end of a suspension rod (223) that is arranged in a downwardly hanging manner in the middle of the suspension arm (22).

5. The crane according to claim 1, characterized in that: The upper fixed pulley (211) is connected to the upper end of the tube body (222), and the wheel cores of the upper fixed pulley (211) and the lower fixed pulley (212) are horizontal and parallel to each other, and are perpendicular to the length direction of the boom (22).

6. The crane according to claim 1, characterized in that: An auxiliary beam (15) is provided between the main beam (13) and the secondary beam (14), and the auxiliary beam (15) is connected to the tower barrel (1) via a support foot (151) provided on the bottom surface of the auxiliary beam (15).

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