Device for laying low-voltage and medium-voltage cable in fan foundation embedded pipe

Abstract

The utility model discloses a device for laying a low-medium voltage cable in a fan foundation embedded pipe, which comprises a winch, an embedded sheath pipe and a cable traction sheath, and is characterized in that the winch is arranged on a tower drum platform in a tower drum; one end of the pre-embedded protective sleeve penetrates through the concrete foundation and is located in the tower drum, and the other end of the pre-embedded protective sleeve is located outside the tower drum; the cable traction sheath sleeves one end, extending into the pre-embedded sheath pipe, of the cable, and the cable traction sheath is connected with a middle traction rope of the winch. The winch is arranged on a tower barrel platform arranged in the tower barrel, under the action of the winch, the cable can be pulled into the tower barrel from the pre-embedded protective sleeve to be connected with the fan, and in the whole process, the cable is located in the pre-embedded protective sleeve all the time, so that the cable can be effectively prevented from being interfered by other external substances, and the service life of the fan is prolonged. Smooth traction of the cable is guaranteed, and therefore the construction progress and the construction quality are guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of cable laying, and in particular to a device for laying low and medium voltage cables in pre-buried pipes in a wind turbine foundation. Background Art

[0002] A wind turbine is an electrical device that converts wind energy into mechanical work, which drives the rotor to rotate and ultimately outputs alternating current. It usually includes a wind wheel and a tower, with the wind wheel rotating at the top of the tower.

[0003] At present, there are two ways to enter the tower cable connecting the generator inside the tower. One is to enter the tower through the bottom of the tower door, and the other is to enter the tower from under the concrete foundation through a pre-buried pipe in the tower wall. For the method of entering from under the concrete foundation, due to the large diameter, heavy weight, long length and hard texture of the cable, it is difficult to pass through the casing, and the edge of the pre-buried casing can easily scrape the end of the cable, which greatly affects the construction quality and progress. Utility Model Content

[0004] The purpose of this application is to provide a device for laying low and medium voltage cables in pre-buried pipes of a wind turbine foundation in order to solve the above problems.

[0005] To achieve the above objectives, the technical solution of this application is:

[0006] A device for laying low and medium voltage cables in a pre-buried pipe in a wind turbine foundation, comprising a winch, a pre-buried sheath pipe and a cable pulling sheath, wherein the winch is arranged on a tower platform inside the tower; one end of the pre-buried sheath pipe passes through a concrete foundation and is located inside the tower, and the other end of the pre-buried sheath pipe is located outside the tower; the cable pulling sheath is sleeved on one end of the cable extending into the pre-buried sheath pipe, and the cable pulling sheath is connected to the middle traction rope of the winch.

[0007] Preferably, an outer ring is provided inside the outer end of the embedded casing tube, an annular liner frame is provided inside the outer ring, a clamping cavity is provided on the annular liner frame, and the number of the clamping cavities is multiple, and the multiple clamping cavities are arranged at intervals along the circumference of the annular liner, and spherical balls are provided to roll in the clamping cavities.

[0008] Preferably, the clamping cavity is provided at a side opening facing away from the outer ring.

[0009] Preferably, a fixing screw is provided on the embedded protective casing tube, and a screw-in end of the fixing screw is located inside the embedded protective casing tube and is threadedly connected to the outer ring.

[0010] Preferably, it also includes an annular guide sleeve, which includes a first side wall and a second side wall, the first side wall is located inside the embedded casing tube, and the second side wall is located outside the embedded casing tube; the annular guide sleeve is connected to the outer peripheral wall of the embedded casing tube.

[0011] Preferably, the first side wall and the second side wall are connected to each other at the end surface of the embedded sheath pipe.

[0012] Preferably, a connecting handle is provided on the second side wall, a connecting hole is provided on the connecting handle, and the fixing screw is passed through the connecting hole.

[0013] The present application discloses a device for laying low and medium voltage cables in pre-buried pipes of a wind turbine foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of cable laying for this application;

[0015] Figure 2 Schematic diagram of cable connection for this application;

[0016] Figure 3 This is a schematic diagram of the structure of the end portion of the embedded sheath pipe in this application;

[0017] Figure 4 This is a front view of the end of the embedded sheath pipe in this application;

[0018] Figure 5 for Figure 4 Cross-sectional view of section AA.

[0019] In the picture:

[0020] 1. Embedded sheath pipe; 10. Annular liner frame; 11. Spherical ball; 12. Annular guide sleeve; 120. First side wall; 121. Second side wall; 13. Connecting handle; 14. Fixing screw; 15. Outer ring; 2. Concrete foundation; 3. Cable; 4. Box-type substation; 5. Optical cable; 6. Pole tower; 7. Cable pulling sheath; 8. Winch. DETAILED DESCRIPTION

[0021] The present application will now be described in further detail with reference to the accompanying drawings. The accompanying drawings are simplified schematic diagrams, which only illustrate the basic structure of the present application in a schematic manner, and therefore only show the components related to the present application.

[0022] like Figure 1-5As shown, a device for laying low and medium voltage cables 3 in the pre-buried pipe of the wind turbine foundation includes a winch 8, a pre-buried sheath pipe 1 and a cable pulling sheath 7. The winch 8 is arranged on the tower platform inside the tower; one end of the pre-buried sheath pipe 1 passes through the concrete foundation 2 and is located inside the tower, and the other end of the pre-buried sheath pipe 1 is located outside the tower; the cable pulling sheath 7 is sleeved on one end of the cable 3 extending into the pre-buried sheath pipe 1, and the cable pulling sheath 7 is connected to the middle traction rope of the winch 8.

[0023] The embedded sheath pipe 1 adopts a PVC-C high-voltage cable 3 sheath pipe, which is fixed by steel bars during the embedded process to prevent displacement during concrete pouring.

[0024] During the pouring of concrete, a blocking device is temporarily provided at the end of the embedded protective casing 1 to prevent accidental entry of concrete into the embedded protective casing 1 during pouring.

[0025] The winch 8 is arranged on a tower platform arranged inside the tower. Under the action of the winch 8, the cable 3 can be pulled from the embedded sheath pipe 1 to the inside of the tower to achieve connection with the wind turbine. During the whole process, the cable 3 is always located inside the embedded sheath pipe 1, thereby effectively avoiding interference from other external substances, ensuring the smooth pulling of the cable 3, and thus ensuring the construction progress and construction quality.

[0026] In some further embodiments, an outer ring 15 is provided inside the outer end of the embedded casing tube 1, an annular liner frame 10 is provided inside the outer ring 15, and a snap-in cavity is provided on the annular liner frame 10. There are multiple snap-in cavities, and the multiple snap-in cavities are arranged at intervals along the circumference of the annular liner, and spherical balls 11 are provided rolling in the snap-in cavities.

[0027] The annular liner frame 10 is connected to the interior of the outer ring 15 by welding or screw connection. A spherical ball 11 is provided in the clamping cavity. When an external object touches the spherical ball 11, the spherical ball 11 can roll in place in the clamping cavity to a certain extent, thereby reducing the friction between the cable 3 and the embedded sheath tube 1, ensuring that it is more convenient to enter the embedded sheath tube 1.

[0028] In addition, even if the spherical ball 11 is stuck and cannot rotate, the spherical ball 11 will form point contact with the outer wall of the cable 3, thereby reducing the friction area while ensuring support for the cable 3.

[0029] In some further embodiments, the clamping cavity is provided with a constriction on one side facing away from the outer ring 15 .

[0030] Since there is no retaining ring on the side of the clamping cavity facing the center of the embedded pipe, the side of the clamping cavity facing away from the outer ring 15 is provided with a constriction to prevent the spherical ball 11 from accidentally slipping off.

[0031] In some further embodiments, a fixing screw 14 is provided on the embedded protective casing tube 1 , and a screw-in end of the fixing screw 14 is located inside the embedded protective casing tube 1 and is threadedly connected to the outer ring 15 .

[0032] There are six fixing screws 14 , which are arranged at intervals in the circumferential direction. The fixing screws 14 pass through the embedded sheath tube 1 and are connected to the inner outer ring 15 to fix the outer ring 15 .

[0033] In some further embodiments, an annular guide sleeve 12 is further included, which includes a first side wall 120 and a second side wall 121. The first side wall 120 is located inside the embedded casing tube 1, and the second side wall 121 is located outside the embedded casing tube 1; the annular guide sleeve 12 is connected to the outer peripheral wall of the embedded casing tube 1.

[0034] The cross section of the annular guide sleeve 12 along the radial direction is a V-shaped cross section, half of which is the first side wall 120 and the other half is the second side wall 121 .

[0035] One end of the first side wall 120 away from the second side wall 121 extends toward the interior of the embedded sheath, and the further toward the interior of the embedded sheath tube 1, the smaller the annular opening formed by the first side wall 120 in the annular guide sleeve 12 becomes, so as to facilitate the insertion of the cable 3.

[0036] In some further embodiments, the first side wall 120 and the second side wall 121 are connected to each other at the end surface of the embedded sheath pipe 1 .

[0037] The first side wall 120 and the second side wall 121 are integrally formed.

[0038] In some further embodiments, a connecting handle 13 is provided on the second side wall 121 , a connecting hole is provided on the connecting handle 13 , and a fixing screw 14 is provided through the connecting hole.

[0039] The annular guide sleeve 12 is connected to the embedded sheath pipe 1 through a connecting handle 13. Specifically, a connecting handle 13 is provided on the second side wall 121, and a connecting hole is provided on the connecting handle 13. When the outer ring 15 is fixed by the fixing screw 14, the fixing screw 14 will simultaneously pass through the connecting hole to fix the annular guide sleeve 12.

[0040] In some other embodiments, the optical cable 5 on the tower 6 also needs to be simultaneously passed through the pre-buried sheath tube 1 to be connected to the inside of the tower.

[0041] Exemplarily, the specific steps may be:

[0042] 1. Wire rope threading

[0043] The wires are passed from the bottom platform at the bottom of the tower to the transformer side of the box-type substation.

[0044] 2. Cable tray bracket installation

[0045] Place the cable reel bracket in the box-type substation, place the cable reel on the cable reel bracket, and fix it at the four corners to prevent shaking and tipping over. Use protective pads on the ground to prevent cable wear when pulling.

[0046] 3. Install the traction device

[0047] After the overall bracket is installed and fixed, the lifting system is installed. The traction device adapter is fixed on the tower platform through the tower bottom platform, and then the traction device is installed on the adapter.

[0048] 4. Traction device power supply grounding

[0049] The generator power cable is temporarily routed to the tower base platform and then connected to the traction device. The generator is surrounded by protective railings, reliably grounded, and equipped with a fire extinguisher.

[0050] 5. Cable pulling sheath installation

[0051] The cable terminals are wrapped with protective materials for protection, and the cable pulling sheath 7 is installed on the cable according to the corresponding specifications. It is tightened with a rolling tape every 20 cm to prevent it from falling off during the pulling process.

[0052] 6. Wire rope and cable fixing

[0053] One side of the wire rope and the cable pulling sheath are connected together with a buckle and fixed firmly.

[0054] 7. Cable pulling

[0055] Workers at the bottom of the tower and in the box-type substation all use walkie-talkies to start the traction device and pull the wire rope, paying attention to controlling the pulling speed to prevent the cable from getting stuck and damaging the cable and machinery. It is prohibited to pull the cable beyond the rated load of the winch.

[0056] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of this application.

Claims

1. A device for laying low and medium voltage cables in pre-buried pipes in wind turbine foundations, characterized in that: The invention comprises a hoist (8), a pre-buried sheath pipe (1) and a cable pulling sheath (7), wherein the hoist (8) is arranged on a tower platform inside the tower; one end of the pre-buried sheath pipe (1) passes through a concrete foundation (2) and is located inside the tower, and the other end of the pre-buried sheath pipe (1) is located outside the tower; the cable pulling sheath (7) is sleeved on one end of the cable (3) extending into the pre-buried sheath pipe (1), and the cable pulling sheath (7) is connected to the middle traction rope of the hoist (8).

2. The device for laying low and medium voltage cables in pre-buried pipes in wind turbine foundations according to claim 1, characterized in that: An outer ring (15) is provided inside one end of the embedded sheath tube (1) located outside, an annular liner frame (10) is provided inside the outer ring (15), and a clamping cavity is provided on the annular liner frame (10). There are multiple clamping cavities, and the multiple clamping cavities are arranged at intervals along the circumference of the annular liner, and spherical balls (11) are provided to roll in the clamping cavities.

3. The device for laying low and medium voltage cables in pre-buried pipes in wind turbine foundations according to claim 2, characterized in that: The clamping cavity is provided with a side opening facing away from the outer ring (15).

4. The device for laying low and medium voltage cables in pre-buried pipes in wind turbine foundations according to claim 3, characterized in that: The embedded protective sleeve (1) is provided with a fixing screw (14), and the screw-in end of the fixing screw (14) is located inside the embedded protective sleeve (1) and is screwed to the outer ring (15).

5. The device for laying low and medium voltage cables in pre-buried pipes in wind turbine foundations according to claim 4, characterized in that: The invention also includes an annular guide sleeve (12), the annular guide sleeve (12) including a first side wall (120) and a second side wall (121), the first side wall (120) being located inside the pre-buried protective sleeve tube (1), and the second side wall (121) being located outside the pre-buried protective sleeve tube (1); the annular guide sleeve (12) is connected to the outer peripheral wall of the pre-buried protective sleeve tube (1).

6. The device for laying low and medium voltage cables in pre-buried pipes in wind turbine foundations according to claim 5, characterized in that: The first side wall (120) and the second side wall (121) are connected to each other at the end surface of the embedded sheath pipe (1).

7. The device for laying low and medium voltage cables in pre-buried pipes in wind turbine foundations according to claim 6, characterized in that: A connecting handle (13) is provided on the second side wall (121), a connecting hole is provided on the connecting handle (13), and the fixing screw (14) is passed through the connecting hole.

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