Wind power generation concrete tower cable force detection device

Abstract

The application discloses a wind power generation concrete tower cylinder inhaul cable force detection device, which comprises an assembly block, a through groove is arranged through the front side horizontal line of the assembly block, an arc-shaped plate is arranged in the through groove, a support is arranged in the arc-shaped plate, a plurality of first rollers are arranged on the support, a driving mechanism for driving the rotation of the plurality of first rollers is arranged on the arc-shaped plate, a guide rod is fixedly connected to the bottom of the arc-shaped plate, the guide rod penetrates through the assembly block and is in sliding connection with the assembly block, an adjusting mechanism for driving the movement of the arc-shaped plate is arranged on the assembly block, a plurality of second rollers are arranged on the inner top of the through groove, and the second rollers are arranged opposite to the first rollers. The application not only facilitates the installation of the vibration pickup on the inhaul cable, is simple and convenient to operate, but also can adjust the position of the installed vibration pickup, can detect the self-vibration frequency of different positions of the inhaul cable, is convenient to use, and is convenient to install at a high position of the inhaul cable.

Description

Technical Field

[0001] This invention relates to the field of wind power generation structure testing technology, and more particularly to a device for testing the cable tension of concrete towers used in wind power generation. Background Technology

[0002] With the large-scale development of low-wind-speed and ultra-low-wind-speed wind farms in China, equipment solutions with larger rotors, higher unit capacities, and taller towers have entered a stage of large-scale application. High towers in the 120-140 meter range have already seen extensive installations and commercial applications abroad. Among these, reinforced concrete towers are widely used as a solution for high-tower wind turbines due to their advantages such as higher safety, simpler control strategies, fewer concrete tower molds, lower cost, better product consistency, shorter construction cycle, and better maintainability. The reinforced concrete tower structure consists of a bottom concrete section and an upper steel tower section. The concrete section is assembled from precast concrete segments. After the precast concrete segments are hoisted, prestressed steel strands are used as cables to apply prestress to the entire tower, thus connecting the concrete sections into a unified whole. The prestress of the prestressed steel strand cables is a key factor affecting the stability of the wind turbine tower; therefore, real-time and effective monitoring of the cable tension plays a crucial role in the safety assessment and maintenance of the wind turbine structure.

[0003] The frequency method relies on the correlation between cable force and cable vibration frequency. Given parameters such as cable length, end constraints, and distributed mass, a highly sensitive vibration sensor is attached to the stay cable to capture its vibration signal under environmental excitation. After filtering, signal amplification, A / D conversion, and spectral analysis, the cable's natural frequency can be measured. The cable force can then be obtained from the relationship between the cable force and its natural frequency. This is an indirect method. With existing instruments and analytical techniques, the frequency measurement accuracy can reach 0.005 Hz.

[0004] Because the vibration pickups are attached to the cable at different positions, they detect different frequencies. Therefore, it is crucial to improve the accuracy of cable frequency measurement by performing frequency detection at different positions on the cable and then comprehensively analyzing the data. Furthermore, it is very inconvenient to install the vibration pickups at higher positions on the cable. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned technical problems by proposing a cable tension detection device for concrete towers used in wind power generation.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A cable tension testing device for wind power concrete towers includes an assembly block. A through groove runs along the front side of the assembly block, and an arc-shaped plate is installed within the groove. A bracket is installed within the arc-shaped plate, and multiple first rollers are mounted on the bracket. A drive mechanism for rotating the multiple first rollers is mounted on the arc-shaped plate. A guide rod is fixedly connected to the bottom of the arc-shaped plate, passing through the assembly block and slidably connected to it. An adjustment mechanism for moving the arc-shaped plate is mounted on the assembly block. Multiple second rollers are installed at the top inner part of the through groove, with the second rollers positioned opposite to the first rollers. An installation groove is provided at the upper end of the assembly block, and a power supply, a vibration pickup, and a controller are installed within the installation groove. The vibration pickup is installed within the installation groove via a limiting mechanism. A sealing mechanism for sealing the installation groove is mounted on the assembly block.

[0008] Preferably, the drive mechanism includes a mounting block mounted on a bracket, a motor mounted on the mounting block, a rotating rod mounted on the output end of the motor, transmission wheels mounted on the shaft ends of the plurality of first rollers, the plurality of transmission wheels being connected by a chain, and the rotating rod being connected to one of the transmission wheels.

[0009] Preferably, the adjusting mechanism includes a screw that passes through the bottom of the assembly block, a torsion block that is fixedly connected to the bottom of the screw, an anti-slip texture on the outer wall of the torsion block, a sleeve that is fixedly connected to the bottom of the arc plate, a slider that is slidably connected inside the sleeve, the upper end of the screw that is rotatably connected to the bottom of the slider, a first spring that is fixedly connected to the upper end of the slider, and the upper end of the first spring that is fixedly connected to the inner top of the sleeve.

[0010] Preferably, the inner wall of the sleeve is rectangular, and the slider is a rectangular block that mates with the sleeve.

[0011] Preferably, the assembly block has a side groove on one side, and the side groove is connected to the mounting groove through multiple heat dissipation holes.

[0012] Preferably, the sealing mechanism includes a sealing ring placed on the assembly block, the sealing ring having a sealing plate abutting against it, and the sealing plate being fixed to the assembly block by bolts.

[0013] Preferably, the limiting mechanism includes a connecting block installed at the bottom of the vibration pickup, the connecting block abutting against the inner wall of the mounting groove, two positioning blocks fixedly connected to the bottom of the mounting groove, each of the two positioning blocks having a limiting rod slidably connected to it, a pull block fixedly connected to the opposite side of each of the two limiting rods, a second spring installed between the pull block and the positioning block, two limiting grooves provided on the outer wall of the connecting block, and the limiting rod being movably positioned within the limiting groove.

[0014] Preferably, the two ends of the second spring are fixedly connected to the pull block and the positioning block, the second spring is sleeved on the outside of the limiting rod, and the second spring does not contact the axial outer wall of the limiting rod.

[0015] Compared with the prior art, the beneficial effects of this invention are as follows:

[0016] 1. Attach the through slot to the outside of the cable, then manually rotate the torsion block. The rotation of the torsion block drives the screw to rotate, and the screw rotates and moves, which can drive the slider, the first spring, the sleeve, and the arc plate to move. Under the action of the guide rod, the stable movement of the arc plate can be ensured. The movement of the arc plate drives the first roller to move. Finally, the first roller and the second roller are attached to the outside of the cable. As the torsion block rotates, the slider moves inside the sleeve. At this time, the first spring is compressed. Under the action of the first spring, the first roller and the second roller are tightly pressed against the outside of the cable. This ensures that the assembly block is assembled on the cable. The operation is simple and convenient.

[0017] 2. When detecting the natural frequency at different positions on the cable, the controller controls the motor to work. The motor drives the rotating rod to rotate, which in turn drives the transmission wheel to rotate. Under the transmission of the chain, multiple transmission wheels can rotate synchronously, thereby causing the first roller to rotate. The rotation of the first roller can move along the cable, thereby adjusting the position of the vibration pickup and allowing detection at different positions on the cable.

[0018] 3. If the vibration pickup needs to be inspected and maintained, the staff will use tools to remove the bolts, then remove the sealing plate, and then manually pull the pull block. The pull block will move and drive the limit rod to move and disengage from the limit groove. At this time, the connecting block is no longer limited, so the vibration pickup can be removed for inspection and maintenance.

[0019] In summary, this invention not only facilitates the installation of the vibration pickup on the cable and is simple and convenient to operate, but also allows for adjustment of the position of the vibration pickup after installation, enabling the detection of the natural frequency at different positions on the cable. It is easy to use and convenient to install at a higher position on the cable. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the cable tension detection device for wind power concrete towers proposed in this invention;

[0021] Figure 2 This is a schematic diagram of point A in the cable tension detection device for wind power concrete towers proposed in this invention;

[0022] Figure 3 This is a schematic diagram of the transmission wheel and chain in the cable tension detection device for wind power concrete towers proposed in this invention;

[0023] Figure 4 This is a side view of the arc-shaped plate in the cable tension testing device for wind power concrete towers proposed in this invention.

[0024] In the diagram: 1 Assembly block, 2 Through slot, 3 Arc plate, 4 First roller, 5 Second roller, 6 Guide rod, 7 Sleeve, 8 Slider, 9 First spring, 10 Screw, 11 Torque block, 12 Sealing plate, 13 Sealing ring, 14 Bolt, 15 Power supply, 16 Vibration pickup, 17 Controller, 18 Heat dissipation hole, 19 Side slot, 20 Connecting block, 21 Limiting slot, 22 Positioning block, 23 Limiting rod, 24 Second spring, 25 Pull block, 26 Motor, 27 Transmission wheel, 28 Chain, 29 Bracket, 30 Mounting block, 31 Rotating rod. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0026] Reference Figure 1-4 A cable tension testing device for wind power concrete tower includes an assembly block 1. A through groove 2 runs through the front side of the assembly block 1. An arc-shaped plate 3 is provided in the through groove 2. A bracket 29 is installed in the arc-shaped plate 3. Multiple first rollers 4 are installed on the bracket 2. A drive mechanism for driving the multiple first rollers 4 to rotate is installed on the arc-shaped plate 3. The drive mechanism includes an installation block 30 installed on the bracket 29. A motor 26 is installed on the installation block 30. A rotating rod 31 is installed at the output end of the motor 26. A transmission wheel 27 is installed at the shaft end of each of the multiple first rollers 4. The multiple transmission wheels 27 are connected by a chain 28. The rotating rod 31 is connected to one of the transmission wheels 27.

[0027] A guide rod 6 is fixedly connected to the bottom of the arc plate 3. The guide rod 6 passes through the assembly block 1 and is slidably connected to it. An adjustment mechanism for driving the arc plate 3 to move is installed on the assembly block 1. The adjustment mechanism includes a screw 10 that passes through the bottom of the assembly block 1. A torsion block 11 is fixedly connected to the bottom of the screw 10. The outer wall of the torsion block 11 is provided with anti-slip texture. A sleeve 7 is fixedly connected to the bottom of the arc plate 3. A slider 8 is slidably connected inside the sleeve 7. The upper end of the screw 10 is rotatably connected to the bottom of the slider 8. A first spring 9 is fixedly connected to the upper end of the slider 8. The upper end of the first spring 9 is fixedly connected to the inner top of the sleeve 7. The inner wall of the sleeve 7 is rectangular. The slider 8 is a rectangular block that cooperates with the sleeve 7.

[0028] Multiple second rollers 5 are installed on the inner top of the through groove 2. The second rollers 5 are arranged opposite to the first rollers 4. The upper end of the assembly block 1 is provided with an installation groove, in which a power supply 15, a vibration pickup 16, and a controller 17 are installed. One side of the assembly block 1 is provided with a side groove 19, which is connected to the installation groove through multiple heat dissipation holes 18. In this way, the heat generated by the power supply 15, the vibration pickup 16, and the controller 17 can be dissipated through the heat dissipation holes 18. The controller 17 is based on IoT remote control.

[0029] The vibration pickup 16 is installed in the mounting groove by a limiting mechanism. The limiting mechanism includes a connecting block 20 installed at the bottom of the vibration pickup 16. The connecting block 20 is abutted against the inner wall of the mounting groove. Two positioning blocks 22 are fixedly connected to the bottom of the mounting groove. Each positioning block 22 is provided with a limiting rod 23 that is slidably connected to it. Pull blocks 25 are fixedly connected to the opposite sides of the two limiting rods 23. A second spring 24 is installed between the pull block 25 and the positioning block 22. The outer wall of the connecting block 20 is provided with two limiting grooves 21. The limiting rod 23 is movably installed in the limiting groove 21. The two ends of the second spring 24 are fixedly connected to the pull block 25 and the positioning block 22. The second spring 24 is sleeved on the outside of the limiting rod 23 and does not contact the axial outer wall of the limiting rod 23.

[0030] The assembly block 1 is equipped with a sealing mechanism for sealing the mounting groove. The sealing mechanism includes a sealing ring 13 placed on the assembly block 1. The sealing ring 13 is provided with a sealing plate 12 that abuts against it. The sealing plate 12 is fixed to the assembly block 1 by bolts 14.

[0031] When using this invention, the operator attaches the through slot 2 to the outside of the cable and then manually rotates the torsion block 11. The rotation of the torsion block 11 drives the screw 10 to rotate. The rotation and movement of the screw 10 can drive the slider 8, the first spring 9, the sleeve 7 and the arc plate 3 to move. Under the action of the guide rod 6, the arc plate 3 can be moved stably.

[0032] The movement of the arc plate 3 drives the first roller 4 to move, and finally the first roller 4 and the second roller 5 are fastened to the outside of the cable. As the torsion block 11 rotates, the slider 8 moves inside the sleeve 7. At this time, the first spring 9 is compressed. Under the action of the first spring 9, the first roller 4 and the second roller 5 are tightly pressed against the outside of the cable. This ensures that the assembly block 1 is assembled on the cable, and the operation is simple and convenient.

[0033] As the cable sways under tension, the natural frequency of the cable can be detected by the vibration pickup 16.

[0034] When detecting the natural frequency at different positions of the cable, the controller 17 controls the motor 26 to work. The motor 26 drives the rotating rod 31 to rotate, and the rotating rod 31 drives the transmission wheel 27 to rotate. Under the transmission of the chain 28, multiple transmission wheels 27 can rotate synchronously, thereby realizing the rotation of the first roller 4. The rotation of the first roller 4 can move along the cable, thereby adjusting the position of the vibration pickup 16, and detection can be performed at different positions on the cable.

[0035] After the test is completed, if the vibration pickup 16 needs to be inspected and maintained, the staff will use tools to remove the bolt 14, then remove the sealing plate 12, and then manually pull the pull block 25. The pull block 25 moves and drives the limit rod 23 to move and disengage from the limit groove 21. At this time, the connecting block 20 is no longer limited, so the vibration pickup 16 can be removed for inspection and maintenance.

[0036] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for detecting the cable tension of a concrete tower for wind power generation, comprising an assembly block (1), characterized in that, The front horizontal line of the assembly block (1) is provided with a through groove (2), and an arc plate (3) is provided in the through groove (2). A bracket (29) is installed in the arc plate (3), and a plurality of first rollers (4) are installed on the bracket (29). A drive mechanism for driving the plurality of first rollers (4) to rotate is installed on the arc plate (3). A guide rod (6) is fixedly connected to the bottom of the arc plate (3). The guide rod (6) passes through the assembly block (1) and is slidably connected to it. A mechanism for driving the arc plate (3) to move is installed on the assembly block (1). The adjustment mechanism includes a plurality of second rollers (5) installed on the inner top of the through groove (2), the second rollers (5) being arranged opposite to the first rollers (4), the upper end of the assembly block (1) having an installation groove, the installation groove containing a power supply (15), a vibration pickup (16) and a controller (17), the vibration pickup (16) being installed in the installation groove by a limiting mechanism, and the assembly block (1) having a sealing mechanism for sealing the installation groove; the adjustment mechanism includes a screw (10) penetrating the bottom of the assembly block (1), the screw (10) The bottom of the arc plate (3) is fixedly connected to a torsion block (11), the outer wall of which is provided with anti-slip texture. The bottom of the arc plate (3) is fixedly connected to a sleeve (7), and a slider (8) is slidably connected inside the sleeve (7). The upper end of the screw (10) is rotatably connected to the bottom of the slider (8). The upper end of the slider (8) is fixedly connected to a first spring (9), and the upper end of the first spring (9) is fixedly connected to the inner top of the sleeve (7). The limiting mechanism includes a connecting block (20) installed at the bottom of the vibration pickup (16). The connecting block (20) is abutted against the inner wall of the mounting groove. Two positioning blocks (22) are fixedly connected to the bottom of the mounting groove. Each of the two positioning blocks (22) is provided with a limiting rod (23) that is slidably connected to it. Each of the two limiting rods (23) is fixedly connected with a pull block (25) on the opposite side. A second spring (24) is installed between the pull block (25) and the positioning block (22). The outer wall of the connecting block (20) is provided with two limiting grooves (21). The limiting rod (23) is located in the limiting groove (21) and is movably set.

2. The cable tension testing device for wind power concrete towers according to claim 1, characterized in that, The drive mechanism includes a mounting block (30) mounted on a bracket (29), a motor (26) mounted on the mounting block (30), a rotating rod (31) mounted on the output end of the motor (26), a transmission wheel (27) mounted on the shaft end of a plurality of first rollers (4), the plurality of transmission wheels (27) being connected by a chain (28), and the rotating rod (31) being connected to one of the transmission wheels (27).

3. The cable tension testing device for wind power concrete towers according to claim 1, characterized in that, The inner wall of the sleeve (7) is rectangular, and the slider (8) is a rectangular block that cooperates with the sleeve (7).

4. The cable tension testing device for wind power concrete towers according to claim 1, characterized in that, The assembly block (1) has a side groove (19) on one side, and the side groove (19) is connected to the mounting groove through a plurality of heat dissipation holes (18).

5. The cable tension testing device for wind power concrete towers according to claim 1, characterized in that, The sealing mechanism includes a sealing ring (13) placed on the assembly block (1), and a sealing plate (12) abutting against the sealing ring (13). The sealing plate (12) is fixed to the assembly block (1) by bolts (14).

6. The cable tension testing device for wind power concrete towers according to claim 1, characterized in that, The two ends of the second spring (24) are fixedly connected to the pull block (25) and the positioning block (22). The second spring (24) is sleeved on the outside of the limiting rod (23), and the second spring (24) does not contact the axial outer wall of the limiting rod (23).

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