Steel strand threading device

Abstract

The invention belongs to the technical field of wind power tower drum cable penetrating, and particularly relates to a steel strand cable penetrating device which is characterized in that a rotating seat is arranged on a support arranged in the range of an upper drum opening hole domain of a tower drum, the rotating seat is located in the middle of the upper drum opening hole domain of the tower drum and rotates around a plumb bob towards a rotating shaft core relative to the support, and a traction assembly is arranged on the rotating seat; the traction assembly comprises a winding wheel with a wheel core located in the horizontal direction, a traction rope is wound around the winding wheel, limiting fit for limiting the traction rope to slide relative to the winding wheel in the circumferential direction is formed between the winding wheel and the traction rope, the two free ends of the traction rope are reversely crossed and extend towards two vertical frames which are arranged on the upper end face of the tower in a central symmetry mode, and fixed pulleys are arranged on the vertical frames. When the power unit drives the reel to rotate, the rope sections of the traction ropes which are vertically arranged at the positions of the two vertical frames do lifting motion in opposite directions, traction operation of the two steel strands can be completed within the same time, and the construction efficiency is greatly improved.

Description

Technical Field

[0001] The patent of this invention relates to the operation of threading a cable through a wind turbine tower, and specifically to a steel strand threading device. Background Art

[0002] Wind turbine towers are typically constructed of steel-concrete structures, with a concrete lower section and a steel upper section. The concrete tower is prefabricated in sections and assembled and hoisted on-site. After hoisting, prestressing is applied to the entire concrete tower using steel strands to form a cohesive whole and enhance the bending resistance of the assembled tower. The strands, which can be tens or even hundreds of meters long, are pulled from the tower base to the top using lifting machinery. Currently, mechanical equipment is used to pull the strands.

[0003] The technical solution disclosed in the patent document entitled "Crane" (publication number CN114516594A, hereinafter referred to as Document 1) includes a base with a vertically arranged column. The upper end of the column is connected to a cantilevered boom that rotates around the axis of the column. A winch is arranged on the base. The traction rope wound on the winch's reel is drawn out and diverted by a diverting pulley. It is then suspended downward from the suspended end of the boom from bottom to top along the column and from the inside to the outside along the boom. The crane base can be stably mounted on the top of the tower and provides a reliable mounting platform for the boom. The boom can rotate around the column to above each cable hole to achieve the traction operation of the entire bundle of prestressed tendons.

[0004] The technical solution disclosed in the patent document entitled "Unbonded External Prestressed Reciprocating Cable Threading System" (publication number CN221523316U, hereinafter referred to as Document 2) includes prestressed tendons, anchors, tool cables, connectors, and a reciprocating cable threading machine. The reciprocating cable threading machine is arranged above the embedded channel, and the anchor is installed at the embedded channel opening. The tool cable passes through the reciprocating cable threading machine and the anchor hole of the anchor, and the end of the tool cable is downwardly connected to the prestressed tendon to be threaded through the connector. The reciprocating cable threading machine includes a housing and toothed rollers installed in the housing. The toothed rollers include a pressure wheel in the upper row and a driving wheel in the lower row. Both the pressure wheel and the driving wheel are provided with a slot that matches the outer diameter of the tool cable. The surface of the slot is provided with a rack for clamping the tool cable.

[0005] In Document 1, the traction rope is lowered to the tower bottom along the corresponding threading holes on the tower by controlling the rotation of the boom. After the steel strand is connected to the free end of the traction rope at the tower bottom, the traction rope is reeled in by a winch, thereby pulling the steel strand from the tower bottom to the tower top, completing the strand threading operation. During this process, the winch on the tower crane can only complete the traction of one steel strand at a time, and the operation time is long, forcing tower top personnel to wait during this time. The overall strand threading operation of the wind turbine tower is inefficient and time-consuming. Secondly, due to the heavy weight and high manufacturing cost of current tower cranes, large crawler cranes are required to carry out the crane's ascent and descent operations. While waiting for the tower crane to complete the threading operation, the crawler crane is idle for a long time, increasing its operating cost and hindering the reduction of enterprise costs. In Document 2, the tool rope is clamped by the racks on the surface of the pressure wheel and the driving wheel to realize the transmission of the tool rope. On the one hand, the contact area between the tool rope and the pressure wheel and the driving wheel is small, and the transmission reliability between them cannot be guaranteed. Secondly, the shear force of the rack on the tool rope is particularly prominent. During the process of pulling the prestressed tendons, the tool rope is easily damaged or broken, causing construction safety accidents. Summary of the Invention

[0006] The present invention provides a steel strand threading device, which improves the threading efficiency and reduces the use cost of the crawler crane.

[0007] Base comprises support, castor, and frame upper is provided with guide rail, and support and conveyer frames movable end contact site are provided with recoil spring or rubber cushion, and castor is arranged on the pin of base bottom four, to carry mobile handler location.

[0008] Compared with the prior art, the technical effect of the present invention is as follows: when the power unit drives the winding wheel to rotate, the rope segments of the traction rope suspended at the two vertical frames are caused to move up and down in opposite directions. Both ends of the traction rope can be used to pull the steel strand. While the traction rope on one side pulls the steel strand upward, the traction rope on the other side is simultaneously lowered to the bottom of the tower to connect the steel strand, and vice versa. Compared with traditional cranes, the traction operation of two steel strands can be completed in the same time, greatly improving construction efficiency. In addition, the traction rope is wound on the winding wheel, and the traction rope and the winding wheel can reliably contact and transmit, while preventing the traction rope from being damaged or broken by shear force, thereby ensuring the normal service life of the traction rope. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0010] Figure 2 for Figure 1 Schematic diagram of the local structure in;

[0011] Figure 3 It is a cross-sectional view of the structure of the present invention;

[0012] Figure 4 is a schematic diagram of the traction component;

[0013] Figure 5 This is a schematic diagram of the motor front end fixing bracket;

[0014] Figure 6 Schematic diagram of the winding method of the traction rope on the winding wheel;

[0015] Figure 7 for Figure 4 K-direction view. DETAILED DESCRIPTION

[0016] The following is combined with Figure 1-7 And related content, the present invention is further described in detail:

[0017] A steel strand threading device, a bracket 10 placed in the range of the tube mouth hole area on the tower 1 is provided with a rotating seat 20, the rotating seat 20 is located in the middle of the tube mouth hole area on the tower 1 and the rotating seat 20 rotates relative to the bracket 10 around the plumb bob to the rotary axis, and a traction assembly 30 is provided on the rotating seat 20, the traction assembly 30 includes a winding wheel 31 with a wheel core located in the horizontal direction, a traction rope 32 is wound on the winding wheel 31, and a limit fit is formed between the two to limit the traction rope 32 from sliding circumferentially relative to the winding wheel 31. The two sides of the traction rope 32 are automatically engaged. The two vertical frames 40 are extended from the ends and are symmetrically arranged toward the center of the upper end surface of the tower 1. A fixed pulley 41 is provided on the vertical frame 40. The two free ends of the traction rope 32 are respectively wound around the fixed pulleys 41 on the two vertical frames 40 and passed through the rope hole 3 on the anchor seat 2 at the upper end of the wall of the tower 1 along the plumb direction. The free end of the traction rope 32 is provided with a connector 33 for connecting the steel strand 4. When the power unit 34 drives the winding wheel 31 to rotate, the rope segments of the traction rope 32 suspended at the positions of the two vertical frames 40 make lifting movements in opposite directions.

[0018] In the above technical solution, during the cable-threading operation on a wind turbine tower, a stand 40 is first installed at the location of one anchor 2 where the cable threading is to be performed. Another stand 40 is then installed in a centrally symmetrical manner at another symmetrical location on the tower 1. When the power unit 34 drives the winding wheel 31 to rotate, the two free ends of the traction rope 32 wound on the winding wheel 31 move synchronously in opposite directions, causing the rope segments of the traction rope 32 suspended from the two stands 40 to perform synchronous lifting and lowering movements in opposite directions. While one traction rope 32 on one side pulls the steel strand 4 upward, the other traction rope 32 on the other side is simultaneously lowered to the tower base, where a worker at the tower base connects the connector 33 at the rope end to the steel strand 4, and vice versa. In this way, driven by the same traction assembly 30, the retraction and extension of the traction rope 32 can complete two steel strand 4 traction and cable-threading operations in the same amount of time, greatly improving construction efficiency and significantly reducing the overall cable-threading operation time. Furthermore, the reduced working time also helps reduce the idle time of the crawler crane, saving the company's crane operation costs. Furthermore, in this solution, the traction rope 32 is wound on the winding wheel 31, and the contact area between the traction rope 32 and the winding wheel 31 is large. Under the action of static friction, the winding wheel 31 and the traction rope 32 achieve rolling cooperation without relative sliding; in addition, the traction rope 32 and the rim surface of the winding wheel 31 form a surface contact rolling cooperation, which avoids the traction rope 32 from being subjected to shear force perpendicular to the length of the rope, ensures that the traction rope 32 is only subjected to tension, and ensures the normal service life of the traction rope 32.

[0019] It should be noted that the bracket 10, rotating base 20, traction assembly 30, and upright frame 40 in this application are all configured as separate parts. Even the traction assembly 30 including the power unit 34 can be disassembled into its components, and the bracket 10 can be disassembled into rod components. This allows the components to be mounted on the tower and then reassembled without the need for lifting equipment. Furthermore, the manufacturing cost of the traction assembly 30 is significantly lower than that of conventional cranes. The crawler crane only needs to complete the operation of raising the traction assembly 30 to the tower, without having to hoist it back to the bottom of the tower, which helps reduce the cost of using the crawler crane.

[0020] Furthermore, the power unit 34 is a motor and the motor is mounted on the rotating seat 20. The winding wheel 31 is coaxially connected to the motor shaft. A fixing frame 35 is provided at the front end of the motor. On the fixing frame 35, there are arranged pressure wheels 36 at intervals on the left and right sides of the winding wheel 31. The wheel core direction of the pressure wheel 36 is arranged parallel to the wheel core direction of the winding wheel 31, and the wheel circumference of the pressure wheel 36 forms a contact rolling fit with the traction rope 32 on the winding wheel 31. In this solution, by arranging pressure wheels 36 on the left and right sides of the winding wheel 31, the pressure wheels 36 are used to tightly press the traction rope 32 on the winding wheel 31, thereby preventing the traction rope 32 from loosening and slipping on the winding wheel 31, ensuring that the rope segments of the traction rope 32 are in close contact with the winding wheel 31 rather than a single point contact, and then under the action of friction, the circumferential slip of the traction rope 32 relative to the winding wheel 31 is limited. The winding wheel 31 can stably drive the traction rope 32 for transmission, thereby realizing the traction operation of the steel strand 4.

[0021] As a preferred solution, the traction rope 32 on the reel 31 is single-stranded and the wrapping angle of the traction rope 32 on the reel 31 is greater than 180 degrees. In this solution, the traction rope 32 is only wound around the reel 31 once. On the basis of meeting the transmission requirements between the traction rope 32 and the reel 31, the winding method of the traction rope 32 on the reel 31 is optimized, which facilitates the assembly operation between them. Secondly, by setting the wrapping angle of the traction rope 32 on the reel 31, the contact area between the traction rope 32 and the circumferential surface of the reel 31 is increased, and the transmission matching reliability between the traction rope 32 and the reel 31 is improved. It should be noted that the wrapping angle of the traction rope 32 on the reel 31 is preferably less than 300 degrees. This not only ensures a sufficiently safe wrapping angle range, but also ensures that the traction rope 32 leaves the rope body of the reel 31 and avoids each other to avoid the rope body contact friction and damage to the traction rope 32, and avoids the additional load caused by friction.

[0022] Combine Figure 4-7As shown, an annular groove 311 is formed on the circumference of the winding wheel 31. The annular groove 311 is arranged concentrically with the winding wheel 31. The rim of the pressure wheel 36, which is adjacent to the winding wheel 31, is embedded in the annular groove 311, and the end face of the pressure wheel 36 is arranged adjacent to the groove wall of the annular groove 311. The traction rope 32 is embedded in the annular groove 311, limiting the displacement of the traction rope 32 in the axial direction of the winding wheel 31. At the same time, since the end face of the pressure wheel 36 is arranged adjacent to the groove wall of the annular groove 311, the pressure wheel 36 acts as a stopper to prevent the traction rope 32 from escaping from the annular groove 311, ensuring reliable contact between the traction rope 32 and the winding wheel 31.

[0023] Furthermore, a swing arm 351 is symmetrically arranged on one side of the fixed frame 35 adjacent to the winding reel 31. The lower end of the swing arm 351 is hingedly connected to the fixed frame 35 via a hinge shaft, and the axis of the hinge shaft is parallel to the wheel core direction of the winding reel 31. The free end of the swing arm 351 is cantilevered upward, and the upper and middle parts of the two swing arms 351 are connected to each other by a spring 352. The elastic force provided by the spring 352 drives the two swing arms 351 closer to each other, and the pressure wheel 36 is provided on the swing arm 351. In this solution, the swing arm 351 serves as a movable part, and the elastic force of the spring 352 is used to drive the two swing arms 351 closer to each other, so that the pressure wheels 36 on the two swing arms 351 can adaptively roll and press on the traction rope 32. The traction rope 32 is also slightly worn. The pressure wheel 36 can also effectively press and restrain the traction rope 32, ensuring reliable contact transmission between the traction rope 32 and the winding reel 31.

[0024] As a preferred embodiment, adjustment holes 3511 are arranged at intervals along the length of the swing arm 351 in the upper and middle portion thereof. A hook is provided at the end of the spring 352, and the hook is hooked onto one of the adjustment holes 3511. Because the lower end of the swing arm 351 is hinged to the fixing frame 35, the arrangement of the adjustment holes 3511 allows different torques to be required when the hooks of the spring 352 are hooked onto different adjustment holes 3511 while the swing arm 351 swings with the same amplitude. This allows the positive pressure of the pressure wheel 36 on the traction rope 32 to be properly controlled for different usage conditions, ensuring stable transmission between the traction rope 32 and the winding reel 31.

[0025] The free end of the traction rope 32 extends from the upper position of the winding wheel 31 to the position of the stand 40. The wheel core position of the pressure wheel 36 is higher than the wheel core position of the winding wheel 31, and the overall layout is more reasonable.

[0026] As a preferred embodiment, a guide roller 37 is provided above the winding wheel 31. The roller core direction of the guide roller 37 is parallel to the wheel core direction of the winding wheel 31, and the roller shaft of the guide roller 37 is in rotational engagement with the fixed frame 35. The free end of the traction rope 32 extends from the winding wheel 31 to the upper roller surface of the guide roller 37 and is wound around the guide roller 37. The provision of the guide roller 37 is used to guide the extension direction of the free end of the traction rope 32 on the one hand, and to prevent the two free ends of the traction rope 32 from interlacing in the annular groove 311 on the winding wheel 31, which would affect the transmission of the traction rope 32.

[0027] As a preferred solution, in order to further improve the efficiency of the cable threading operation of the wind turbine tower, every two uprights 40 and a traction assembly 30 constitute a group of cable threading devices. Two groups of cable threading devices are arranged on the tower 1 and the traction assemblies 30 in the two cable threading devices are arranged on the same rotating seat 20. Compared with a single group, the two groups of cable threading devices can pull four steel strands 4 per unit time, and the cable threading construction efficiency is further improved.

Claims

1. A steel strand threading device, characterized in that: A rotating seat (20) is provided on a bracket (10) placed in the range of the upper barrel hole of the tower (1). The rotating seat (20) is located in the middle of the upper barrel hole of the tower (1) and the rotating seat (20) rotates relative to the bracket (10) around the plumb bob to the rotary axis. A traction assembly (30) is provided on the rotating seat (20). The traction assembly (30) includes a winding wheel (31) whose wheel core is located in the horizontal direction. A traction rope (32) is wound around the winding wheel (31) and a limit fit is formed between the two to limit the traction rope (32) from sliding circumferentially relative to the winding wheel (31). The two free ends of the traction rope (32) cross in opposite directions. The two vertical frames (40) are respectively extended to the two vertical frames (40) arranged symmetrically on the upper end surface of the tower (1). Fixed pulleys (41) are provided on the vertical frames (40). The two free ends of the traction rope (32) are respectively wound around the fixed pulleys (41) on the two vertical frames (40) and passed through the rope holes (3) on the anchor seat (2) at the upper end of the tower wall (1) along the plumb line. The free ends of the traction rope (32) are provided with connectors (33) for connecting to the steel strands (4). When the power unit (34) drives the winding wheel (31) to rotate, the rope segments of the traction rope (32) suspended at the positions of the two vertical frames (40) perform lifting and lowering movements in opposite directions.

2. The steel strand threading device according to claim 1, characterized in that: The power unit (34) is a motor and the motor is installed on the rotating seat (20). The winding wheel (31) is coaxially connected to the motor shaft. A fixing frame (35) is provided at the front end of the motor. A pressure wheel (36) is arranged on the fixing frame (35) at intervals on the left and right sides of the winding wheel (31). The wheel core direction of the pressure wheel (36) is arranged parallel to the wheel core direction of the winding wheel (31), and the wheel circumference of the pressure wheel (36) and the traction rope (32) on the winding wheel (31) form a contact rolling fit.

3. The steel strand threading device according to claim 2, characterized in that: The traction rope (32) on the winding wheel (31) is single-stranded and the covering angle of the traction rope (32) on the winding wheel (31) is greater than 180 degrees.

4. The steel strand threading device according to claim 3, characterized in that: An annular groove (311) is provided on the circumferential surface of the winding wheel (31), and the annular groove (311) is arranged concentrically with the winding wheel (31). A wheel rim on one side of the pressure wheel (36) adjacent to the winding wheel (31) is embedded in the annular groove (311), and an end surface of the pressure wheel (36) and a groove wall of the annular groove (311) are arranged adjacent to each other in a gap.

5. The steel strand threading device according to claim 3, characterized in that: A swing arm (351) is symmetrically arranged on one side of the fixed frame (35) adjacent to the winding wheel (31), the lower end of the swing arm (351) is hingedly connected to the fixed frame (35) through a hinge shaft, and the axis core direction of the hinge shaft is parallel to the wheel core direction of the winding wheel (31), the free end of the swing arm (351) is cantilevered upward, and the middle and upper parts of the two swing arms (351) are connected to each other through a spring (352), and the elastic force provided by the spring (352) drives the two swing arms (351) to approach each other, and the pressure wheel (36) is arranged on the swing arm (351).

6. The steel strand threading device according to claim 5, characterized in that: Adjustment holes (3511) are arranged at intervals in the middle and upper part of the swing arm (351) along the length direction of the arm, and a hook is provided at the end of the spring (352), and the hook is hooked on one of the adjustment holes (3511).

7. The steel strand threading device according to any one of claims 3 to 5, characterized in that: The free end of the traction rope (32) extends from a position above the winding wheel (31) to a position where the stand (40) is located, and the wheel core position of the pressing wheel (36) is higher than the wheel core position of the winding wheel (31).

8. The steel strand threading device according to claim 7, characterized in that: A guide roller (37) is provided above the winding wheel (31), the roller core direction of the guide roller (37) is parallel to the wheel core direction of the winding wheel (31), and the roller shaft of the guide roller (37) is in rotational cooperation with the fixed frame (35). The free end of the traction rope (32) extends from the winding wheel (31) to the upper roller surface of the guide roller (37) and is wound around the guide roller (37).

9. The steel strand threading device according to claim 1, characterized in that: Every two uprights (40) and a traction assembly (30) form a set of cable-threading devices. Two sets of cable-threading devices are arranged on the tower (1), and the traction assemblies (30) in the two cable-threading devices are arranged on the same rotating seat (20).

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