Mechanical model and analysis system for flexible attachment of power tower to guyed mast

Abstract

The application discloses a flexible attachment coupling mechanical model of a power tower and a holding pole, and is characterized by the following technical scheme: each angle steel main material of a power iron tower and each angle steel main material of a lattice holding pole are connected with a deformation detection unit; the deformation detection unit comprises a metal pipe, a sealing rubber pipe and an adjustable pressure detector; the metal pipe is fixedly connected with the angle steel main material along the length direction of the angle steel main material; the diameter and the length of the sealing rubber pipe are not less than the inner diameter and the length of the metal pipe; the sealing rubber pipe is filled with liquid and is connected in the metal pipe; the adjustable pressure detector comprises a first piston cylinder, a second piston cylinder and a pressure sensor; the cross section of a first piston body in the first piston cylinder is smaller than the cross section of a second piston body in the second piston cylinder. The application adopts an indirect deformation measurement mode to replace a direct measurement mode of an existing strain sensor, so that the problem of high experimental cost caused by a large number of strain sensors is solved.

Description

Technical Field

[0001] This invention belongs to the field of power transmission construction technology, specifically relating to a flexible attachment coupling mechanical model and analysis system for power towers and poles. Background Technology

[0002] With the rapid development of my country's power construction, the power transmission system, as a crucial guarantee for national construction and people's lives, has profound implications for safety. In the construction of transmission towers, gantry cranes, as a type of lightweight special lifting equipment, are widely used in the on-site erection of transmission line towers in China due to their mature technology, strong terrain adaptability, and low operating costs. However, as the height of transmission towers increases, their overall rigidity decreases. Therefore, analyzing the dynamic characteristics of the gantry crane coupling system of transmission towers under construction is of great significance for ensuring the safety of equipment and personnel at the construction site during the tower erection process.

[0003] Currently, the deformation monitoring of pylons and towers involves attaching strain sensors to weak points on the pylon. These sensors transmit the deformation data to a flexible attachment analysis system. A mechanical analytical model and parametric analysis platform are then established to automatically calculate the deformation stress parameters, thus revealing the stress distribution across the entire pylon. However, this system has the following shortcomings:

[0004] 1. As the height of power transmission towers and poles continues to increase, the weak areas expand accordingly. Conventional strain sensors are tens to hundreds of centimeters long. If strain sensors are applied to the entire weak area, the number of strain sensors would be too large, resulting in extremely high costs for coupled mechanical models.

[0005] 2. The weak area is not a fixed location. Different forces on the tower and the pylon result in different weak areas, and multiple weak areas may exist. Therefore, in coupled mechanical model testing, the corresponding weak area needs to be determined according to the type of applied stress, and then a certain number of strain sensors are attached to the weak area. Testing another type of stress requires disassembling the strain sensors and attaching them to another weak area. Although this testing method is cumbersome and requires extensive preparation, if the weak area is accurately identified, the experimental data obtained from the analysis is close to the actual data. However, in actual testing, this is not the case. On the one hand, it is difficult to determine the weak area, and the area of ​​the weak area is also difficult to accurately define. On the other hand, due to the aforementioned problem 1, for large-area weak areas, only the sampling method of intermittently distributed strain sensors can be used, using the sampled deformation data to replace the actual deformation data of the entire weak area. This method cannot accurately reflect the actual deformation of the weak area, resulting in a large deviation between the experimental data and the actual data, thus losing the meaning of the mechanical analytical model. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a flexible attachment coupling mechanical model for power towers and scaffolding poles. Each angle steel main member of the power tower is connected to a deformation detection unit along with each angle steel main member of the lattice-type scaffolding pole. The deformation detection unit includes a metal tube, a sealing tube, and an adjustable pressure detector. The metal tube is fixedly connected to the angle steel main member along its length. The diameter and length of the sealing tube are not less than the inner diameter and length of the metal tube. The sealing tube is filled with liquid and connected to the inside of the metal tube. The adjustable pressure detector includes a first piston cylinder, a second piston cylinder, and a pressure sensor. The cross-sectional area of ​​the first piston body in the first piston cylinder is smaller than the cross-sectional area of ​​the second piston body in the second piston cylinder. The two chambers of the first piston cylinder are connected to a sealing hose and a second piston cylinder, respectively. The piston rod of the second piston cylinder is connected to the pressure detection end of a pressure sensor, and the space between the first piston body and the second piston body is filled with pressurized oil. The power tower includes a first power supply unit and a first information processing unit. The first information processing unit is electrically connected to all deformation detection units of the power tower and the first power supply unit, respectively. The lattice-type mast includes a second power supply unit and a second information processing unit. The second information processing unit is electrically connected to all deformation detection units of the lattice-type mast and the second power supply unit, respectively. It includes a ground information processing unit. The first information processing unit and the second information processing unit are electrically connected to the ground information processing unit through a wireless transmission module, respectively.

[0007] The preferred embodiment of the flexible attachment coupling mechanical model between the power tower and the pole in this invention is as follows: the metal tube is elastically deformable and its inner surface is provided with an inner spiral, while the outer surface of the sealing tube is provided with an outer spiral adapted to the inner spiral. The sealing tube is rotated into the metal tube. The structure of the inner and outer spirals greatly increases the contact area between the metal tube and the sealing tube. Once the metal tube deforms, the sealing tube deforms accordingly, preventing misalignment or slippage. Deformation transmission is more direct and accurate.

[0008] The preferred embodiment of the flexible attachment coupling mechanical model between the power tower and the pole in this invention is as follows: A spring and a slider are provided at the bottom of the second piston cylinder. The slider can slide along the second piston cylinder. The pressure sensor and the spring are respectively fixedly connected to the two sides of the slider. The pressure sensor compresses the spring to offset the displacement of the piston rod, without affecting the pressure detection of the piston rod.

[0009] The preferred embodiment of the flexible attachment coupling mechanical model between the power tower and the pole in this invention is as follows: The adjustable pressure detector includes a resistance cylinder fixedly connected inside a second piston cylinder. A suitable resistance piston body is provided inside the resistance cylinder. The piston rod of the second piston cylinder passes through the resistance piston body and is connected to a pressure sensor, and the piston rod is fixedly connected to the resistance piston body. The adjustable pressure detector includes an adjusting cylinder, with both ends connected to the two ends of the resistance cylinder. A horizontal fixed disk and a rotating disk coaxial with the fixed disk are provided inside the adjusting cylinder. Both the fixed disk and the rotating disk have opposing flow holes. By rotating the rotating disk, the two flow holes are misaligned, thereby changing the resistance experienced by the resistance piston body sliding inside the resistance cylinder. The adjustable pressure detector includes a brake-type servo motor and a reduction gear assembly located outside the adjusting cylinder. The output shaft of the brake-type servo motor is connected to the central shaft of the rotating disk via the reduction gear assembly.

[0010] Since even small deformations of power transmission towers and lattice-type scaffolds can cause deformation of the sealing hose, in order to obtain accurate data under different deformation types, the resistance of the piston body can be changed to correct for pressure fluctuations caused by other factors, such as low-frequency vibration, wind resistance, and other non-measurable factors causing deformation of the sealing hose. The sensitivity of the pressure sensor can be reduced by increasing the resistance of the piston rod, thereby correcting measurement errors.

[0011] The beneficial effects of the flexible attachment coupling mechanical model between the power tower and the pole in this invention are as follows:

[0012] 1. The sealing tube is tightly connected to the corresponding angle steel main material. As long as the angle steel main material deforms, it can cause the sealing tube to deform. The deformation of the sealing tube will increase the internal pressure. This pressure is amplified by the first piston cylinder and the second piston cylinder and then captured by the pressure sensor. The indirect deformation measurement method is used instead of the existing strain sensor direct measurement method, thus solving the problem of high experimental costs caused by the use of a large number of strain sensors.

[0013] 2. Each angle steel main member is equipped with a deformation detection unit. All angle steel main members of the power transmission tower and the lattice-type scaffolding are covered with deformation detection units. Instead of using sampling data to replace the calculation method of real data, the entire power transmission tower and the entire lattice-type scaffolding are tested. The feedback deformation data is real and the data deviation is minimal. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram showing the connection between the deformation detection unit and the power tower in this invention;

[0016] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0017] Figure 3 This is a schematic diagram showing the connection between the deformation detection unit and the lattice-type support rod in this invention;

[0018] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0019] Figure 5 This is a schematic diagram showing the metal tube and the sealing tube after separation in this invention;

[0020] Figure 6 This is a schematic diagram of the adjustable pressure detector in this invention;

[0021] Figure 7 for Figure 6 A magnified view of point C in the middle.

[0022] Reference numerals: 1. Power transmission tower; 2. Lattice-type mast; 3. Angle steel main material; 4. Metal pipe; 5. Sealing hose; 6. Deformation detection unit; 7. Inner spiral; 8. Outer spiral; 9. First piston cylinder; 10. Second piston cylinder; 11. Pressure sensor; 12. First piston body; 13. Second piston body; 14. Piston rod; 15. Spring; 16. Sliding block; 17. Resistance cylinder; 18. Resistance piston body; 19. Adjusting cylinder; 20. Brake-type servo motor; 21. Drive gear; 22. Driven gear; 23. Transmission shaft; 24. Worm gear; 25. Worm wheel; 26. Flow hole. Detailed Implementation

[0023] In view of the shortcomings of the prior art, the inventors of this invention, through long-term research and extensive practice, have proposed the technical solution of this invention. The technical solution, its implementation process, and principles will be further explained below with reference to the accompanying drawings and specific implementation examples in the embodiments of this application.

[0024] like Figures 1 to 4 As shown, this embodiment provides a flexible attachment coupling mechanical model of a power tower and a scaffolding pole. Each angle steel main member 3 of the power tower 1 and each angle steel main member 3 of the lattice scaffolding pole 2 are connected to a deformation detection unit 6. When the power tower 1 or the lattice scaffolding pole 2 undergoes torsional deformation, bending deformation, etc., the deformation of the angle steel main member 3 is the largest, while the deformation of auxiliary materials such as diagonal supports and transverse supports is not obvious. Therefore, it is most appropriate to connect the deformation detection unit 6 on the angle steel main member 3.

[0025] This embodiment also includes a first power supply unit and a first information processing unit installed on the power transmission tower 1, a second power supply unit and a second information processing unit installed on the lattice-type mast 2, and a ground information processing unit. The first information processing unit is electrically connected to all deformation detection units 6 on the power transmission tower 1 and the first power supply unit, respectively. The first power supply unit supplies power to the first information processing unit and all deformation detection units 6 on the power transmission tower 1. Similarly, the second power supply unit supplies power to the second information processing unit and all deformation detection units 6 on the lattice-type mast 2. The first and second information processing units are electrically connected to the ground information processing unit via wireless transmission modules. Data acquired by the first and second information processing units through the deformation detection units 6 is sent to the ground information processing unit, which constructs a flexible attachment coupling mechanical analysis system for the power tower and mast. Through specific deformation data, the system automatically calculates deformation stress parameters, thereby obtaining the accurate stress distribution of the entire power transmission tower 1 and the lattice-type mast 2. The specific signal processing flow of the flexible attachment coupling mechanical analysis system for the power tower and mast is as follows:

[0026] The deformation detection unit 6 of the power tower 1 acquires the deformation of each angle steel main member 3 of the power tower 1 in real time → first information processing unit → wireless transmission module → ground information processing unit.

[0027] The deformation detection unit 6 of the lattice-type scaffold 2 acquires the deformation of each angle steel main member 3 of the lattice-type scaffold 2 in real time → second information processing unit → wireless transmission module → ground information processing unit.

[0028] The height of power tower 1 and the height of lattice mast 2 are manually input into the ground information processing unit. The ground information processing unit will automatically adapt all the deformation data acquired to the input height data to simulate the stress distribution of the entire power tower 1 and the entire lattice mast 2. The stress distribution can be updated accordingly with the deformation data transmitted back in real time, forming a dynamic stress distribution model of power tower 1 and dynamic stress distribution model of lattice mast 2. This provides accurate real-time data for analyzing the dynamic characteristics of the coupling system of the power transmission tower mast under construction.

[0029] The specific structure of the deformation detection unit 6 in this embodiment is as follows:

[0030] like Figure 5As shown, the deformation detection unit 6 includes a metal tube 4, a sealing tube 5, and an adjustable pressure detector. The metal tube 4 is fixedly connected to the angle steel main member 3 along its length. Specifically, the metal tube 4 is elastically deformable. The metal tube 4 is welded and fixed along the inner 90° angle of the angle steel main member 3. The metal tube 4 is fixedly connected to both side walls of the angle steel main member 3, and deformation of either side wall will cause deformation of the metal tube 4. In addition, fixing along the inner 90° angle of the angle steel main member 3 can avoid installation conflicts with auxiliary materials, bolts, etc. The diameter and length of the sealing tube 5 are not less than the inner diameter and length of the metal tube 4. The sealing tube 5 itself cannot be stretched. The sealing tube 5 fills the metal tube 4, and the gap between the sealing tube 5 and the metal tube 4 is extremely small. After the metal tube 4 deforms, it will directly squeeze the sealing tube 5. The sealing tube 5 is filled with liquid, which will cause the hydraulic pressure inside the sealing tube 5 to rise. To further improve the sensitivity of the sealing tube 5 to deformation changes, the inner surface of the metal tube 4 is provided with an inner spiral 7, and the outer surface of the sealing tube 5 is provided with an outer spiral 8 that matches the inner spiral 7. By rotating the sealing tube 5 into the metal tube 4, the structure of the inner spiral 7 and the outer spiral 8 can greatly increase the contact area between the metal tube 4 and the sealing tube 5. Once the metal tube 4 deforms, the sealing tube 5 deforms accordingly, without misalignment or slippage between the two, making the deformation transmission more direct and accurate.

[0031] This embodiment obtains the deformation of the angle steel main member 3 by detecting the hydraulic pressure within the sealing tube 5. It uses an indirect deformation measurement method instead of the existing direct measurement method with strain sensors, thus solving the problem of high experimental costs caused by using a large number of strain sensors. This embodiment uses an adjustable pressure detector to detect the hydraulic pressure within the sealing tube 5. The specific structure of the adjustable pressure detector is as follows:

[0032] like Figure 6 and Figure 7 As shown, the adjustable pressure detector includes a first piston cylinder 9, a second piston cylinder 10, and a pressure sensor 11. The cross-section of the first piston body 12 inside the first piston cylinder 9 is smaller than the cross-section of the second piston body 13 inside the second piston cylinder 10. The two chambers of the first piston cylinder 9 are respectively connected to a sealing tube 5 and the second piston cylinder 10. The liquid in the sealing tube 5 fills the connected portion of the second piston cylinder 10. The piston rod 14 of the second piston cylinder 10 is connected to the pressure detection end of the pressure sensor 11, and the space between the first piston body 12 and the second piston body 13 is filled with pressurized oil. Additionally, a spring 15 and a slider 16 are provided at the bottom of the second piston cylinder 10. The slider 16 can slide along the second piston cylinder 10. The pressure sensor 11 and the spring 15 are respectively fixedly connected to the two sides of the slider 16. The pressure sensor 11 compresses the spring 15 to offset the displacement of the piston rod 14 without affecting the pressure detection of the piston rod 14.

[0033] The adjustable pressure detector of this embodiment includes a resistance cylinder 17 fixedly connected inside a second piston cylinder 10. A matching resistance piston body 18 is provided inside the resistance cylinder 17. The piston rod 14 of the second piston cylinder 10 passes through the resistance piston body 18 and is connected to a pressure sensor 11, with the piston rod 14 and resistance piston body 18 fixedly connected. The adjustable pressure detector includes an adjusting cylinder 19, with both ends connected to the two ends of the resistance cylinder 17. The adjusting cylinder 19 contains a horizontally fixed disk and a rotating disk coaxial with the fixed disk. Both the fixed disk and the rotating disk have opposing flow holes 26. By rotating the rotating disk, the two flow holes 26 are misaligned, thereby changing the resistance experienced by the resistance piston body 18 sliding within the resistance cylinder 17. The adjustable pressure detector includes a brake-type servo motor 20 and a reduction gear assembly located outside the adjusting cylinder 19. The output shaft of the brake-type servo motor 20 is connected to the central shaft of the rotating disk via the reduction gear assembly. Specifically, the deceleration assembly includes a drive gear 21 coaxially fixed to the output shaft of the brake-type servo motor 20 and a driven gear 22 meshing with the drive gear 21. The driven gear 22 extends into the adjusting cylinder 19 via a transmission shaft 23. A worm gear 24 coaxially fixed to the end of the transmission shaft 23 is provided, and a worm wheel 25 meshing with the worm gear 24 is provided on the central shaft of the rotating disk, thus forming a two-stage deceleration structure. Since even small deformations of the power tower 1 and the lattice-type mast 2 can cause deformation of the sealing hose 5, in order to obtain real data under different deformation types, the resistance of the resistance piston body 18 is changed to correct for pressure fluctuations caused by other factors. For example, in order to obtain deformation data caused by bending stress, the power tower 1 and the lattice-type mast 2 are generally pulled by steel wire ropes during the test. However, the actual experiment is affected by non-measurable factors such as vibration of the steel wire rope and strong winds. The deformation of the sealing hose 5 caused by these non-measurable factors can reduce the sensitivity of the pressure sensor 11 by increasing the resistance of the piston rod 14, thereby correcting the measurement error. The specific methods to increase resistance are as follows:

[0034] The brake-type servo motor 20 drives the rotating disk to rotate through the reduction assembly. The flow hole 26 of the rotating disk and the flow hole 26 of the fixed disk are gradually misaligned, reducing the flow area of ​​the regulating cylinder 19, reducing the flow rate, increasing the fluid resistance on the resistance piston body 18, and correspondingly, the piston rod 14 forms a reaction force on the second piston body 13, increasing the pressure required to push the piston rod 14, thus offsetting the deformation of the sealing tube 5 caused by non-measuring factors.

[0035] Furthermore, since the displacement of the second piston body 13 will not exceed the position of the resistance cylinder 17, the resistance cylinder 17 inside the second piston body 13 will not affect the sliding of the second piston body 13 within the second piston cylinder 10.

[0036] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It should not be considered that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A flexible attachment coupling mechanical model of a power tower and a pole, characterized in that: Each angle steel main member of the power transmission tower and each angle steel main member of the lattice-type support pole are connected to a deformation detection unit. The deformation detection unit includes a metal tube, a sealing tube, and an adjustable pressure detector. The metal tube is elastically deformable and is fixedly connected to the angle steel main member along its length. The diameter and length of the sealing tube are not less than the inner diameter and length of the metal tube. The sealing tube is filled with liquid and connected to the metal tube. The adjustable pressure detector includes a first piston cylinder, a second piston cylinder, and a pressure sensor. The cross-section of the first piston body in the first piston cylinder is smaller than the cross-section of the second piston body in the second piston cylinder. The two chambers of the first piston cylinder are respectively connected to the sealing tube and the second piston cylinder. The piston rod of the second piston cylinder is connected to the pressure detection end of the pressure sensor. The space between the first piston body and the second piston body is filled with pressurized oil. The power tower includes a first power supply unit and a first information processing unit. The first information processing unit is electrically connected to all deformation detection units of the power tower and the first power supply unit, respectively. The lattice-type scaffold includes a second power supply unit and a second information processing unit. The second information processing unit is electrically connected to all deformation detection units and the second power supply unit of the lattice-type scaffold. It includes a ground information processing unit, and a first information processing unit and a second information processing unit are electrically connected to the ground information processing unit via wireless transmission modules.

2. The flexible attachment coupling mechanical model of the power tower and the pole as described in claim 1, characterized in that: The inner surface of the metal tube is provided with an inner spiral, and the outer surface of the sealing tube is provided with an outer spiral that matches the inner spiral.

3. The flexible attachment coupling mechanical model of the power tower and the pole according to claim 1, characterized in that: The bottom of the second piston cylinder is provided with a spring and a slider. The slider can slide along the second piston cylinder. The pressure sensor and the spring are respectively fixedly connected to the two sides of the slider.

4. The flexible attachment coupling mechanical model of the power tower and the pole as described in claim 3, characterized in that: The adjustable pressure detector includes a resistance cylinder fixedly connected inside a second piston cylinder. The resistance cylinder is provided with a suitable resistance piston body. The piston rod of the second piston cylinder passes through the resistance piston body and is connected to the pressure sensor. The piston rod and the resistance piston body are fixedly connected.

5. The flexible attachment coupling mechanical model of the power tower and the pole according to claim 4, characterized in that: The adjustable pressure detector includes an adjusting cylinder, the two ends of which are respectively connected to the two ends of the resistance cylinder; the adjusting cylinder is provided with a horizontal fixed plate and a rotating plate coaxial with the fixed plate. The fixed plate and the rotating plate are both provided with opposite flow holes. By rotating the rotating plate, the two flow holes are misaligned, thereby changing the resistance encountered by the resistance piston body sliding in the resistance cylinder.

6. The flexible attachment coupling mechanical model of the power tower and the pole according to claim 5, characterized in that: The adjustable pressure detector includes a brake-type servo motor and a reduction gear assembly located outside the regulating cylinder. The output shaft of the brake-type servo motor is connected to the central shaft of the rotating disk via the reduction gear assembly.

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