One-tower multi-frequency self-standing medium wave launching tower

Abstract

The utility model belongs to the technical field of medium-wave broadcasting, and relates to a one-tower multi-frequency self-standing medium-wave transmitting tower, which mainly comprises a plurality of supporting upright posts, a feeder line central upright post for fixedly transmitting a transmitting signal, and a plurality of insulating devices which are arranged on the supporting upright posts and partition the supporting upright posts into independent transmitting units, the height of each transmitting unit can be determined according to the required transmitting frequency, and the tower column is further adjusted to achieve the optimal transmitting effect; and compared with a traditional launching tower, the contact area with air is reduced, the device can be suitable for different seasonal changes, manual adjustment of the network is not needed, and adaptability and reliability are high. According to the utility model, the integrated self-standing tower column is provided with a plurality of transmitting units, so that the integrated self-standing tower column can simultaneously transmit various signals with different frequencies, the structure is simplified, the cost is reduced, the occupied area is saved, and the signals are efficiently transmitted; the whole design is scientific and reasonable, the structure is simple, the land cost can be effectively saved, the manpower demand is reduced, and the application degree is improved.

Description

Technical Field:

[0001] This utility model belongs to the field of medium-wave broadcasting technology and relates to a multi-frequency self-supporting medium-wave transmission tower. By deploying multiple transmission units on an integrated self-supporting tower column, it can transmit multiple signals of different frequencies simultaneously, simplifying the structure and reducing costs, saving floor space, and efficiently transmitting signals. Background technology:

[0002] With the continuous development and progress of science and technology, a new information society has gradually formed, based on electronic information technology, with information resources as its fundamental development resource, information service industries as its basic social industry, and digitalization and networking as its basic modes of social interaction. Human life is increasingly reliant on information dissemination. Medium-wave broadcasting operates on a frequency range of 526.5 kHz to 1606.5 kHz, with a channel spacing of 9 kHz; the nominal carrier frequencies range from 531 kHz to 1602 kHz, totaling 120 frequencies. Medium-wave transmission towers are crucial facilities for broadcast signal transmission, responsible for converting radio station audio into radio waves and transmitting them into the air for receivers. This technology has been widely used since the 20th century and continues to play a vital role in many areas, especially remote mountainous regions, rural areas, and disaster emergency communications.

[0003] Transmission towers are divided into guyed towers and freestanding towers. Guyed towers have a smaller contact area with the air, so seasonal changes have less impact on the tower's impedance, and the antenna configuration network does not need to be adjusted throughout the year, but the guying is complex and cumbersome. Freestanding towers, on the other hand, eliminate the complex guying, but they have a complex structure, are bulky, have a larger contact area with the air, and are more affected by seasonal changes, especially in summer and winter, requiring at least two adjustments to the antenna configuration network each year.

[0004] The optimal height for a medium-wave transmitting antenna is 0.53λ (λ is the wavelength, calculated by dividing the speed of light by the transmission frequency). In practice, λ / 4 is generally used. The radius of the transmitting ground network is equal to the height of the transmitting antenna. Taking a transmission frequency of 531kHz as an example, the optimal height of the transmission tower is approximately 141 meters, and the area occupied by the transmitting ground network is approximately 94 acres. Because obstacles such as mountains and tall buildings can block and reflect the transmitted signal, medium-wave transmitting stations should generally avoid areas with large terrain undulations, prioritizing flat and open areas to facilitate radio wave radiation and reception. The land actually occupied is mostly arable land. To conserve land resources and reduce construction costs, traditional medium-wave transmitting towers generally use a dual-frequency or tri-frequency shared tower approach, meaning two or three transmitters of different frequencies share a single tower. However, dual-band and tri-band co-tower transmission towers also have many drawbacks: First, the interval between each two frequencies must be greater than 1.25 times; second, since the tower height is fixed, it is impossible to ensure that each frequency has an optimal antenna height, significantly reducing transmission performance; third, the transmission power must be the same or similar; fourth, the coordination network is complex. To prevent transmission interference, each transmission frequency must block and notch other transmission frequencies, leading to complex circuit design. Therefore, at present, only tri-band co-tower transmission is feasible at most.

[0005] In the prior art, Chinese patent CN202215038U discloses a self-supporting internal flange single-tube transmission tower, mainly comprising a tower body with an internal flange connection and various accessories with related functions. The tower body is a straight-seam welded steel pipe welded through an internal flange to form a single-tube structure. A ladder is welded to one side of the tower body, and a hydraulic lifting and lowering device is provided at the bottom of the tower body. A fixed bracket and a cable feeder for fixing the transmission are welded inside the main pipe of the tower body, ensuring the communication line is securely fixed and preventing damage. The single-tube structure is simpler than the corresponding angle steel combination structure, reduces the number of processed parts, and is easier to transport and install.

[0006] Chinese patent CN202227766U discloses an all-steel pipe composite communication tower, mainly comprising a tower body made of steel connecting parts. The communication tower is equipped with lightning rods, stiffening plates, antenna supports, connecting bolts, flanges, etc. Its features are: the flanges on the tower body are all set parallel to the ground plane; the tower body is a frame structure formed by straight seam welded steel pipes; the straight seam welded steel pipes are connected by connecting plates to diagonal braces and ribs, and are connected into a whole by flange assembly; the cross-section of the tower body has a highly stable triangular structure.

[0007] Chinese patent CN202467304U discloses a self-supporting single-tube tower, including a tower body and a base plate. A tower base is provided between the tower body and the base plate. A hinged arm plate is fixedly provided on the outer surface of the bottom of the tower body. A hinge seat is fixedly provided on the outer surface of the tower base and is hinged to the hinged arm plate. A hydraulic cylinder is inclinedly provided between the tower body and the base plate. The fixed end of the hydraulic cylinder is hinged to the base plate, and the telescopic end of the hydraulic cylinder is hinged to the tower body.

[0008] The aforementioned existing technologies involve transmission towers with limited transmission frequencies, large frequency intervals, significant impact of seasonal variations on tower impedance, fixed height, and complex configuration networks. Through research and analysis, the inventors have found that no existing technology discloses a self-supporting medium-wave transmission tower that utilizes insulators to divide multiple tower columns into multiple transmission units to achieve multi-frequency transmission. Therefore, inventing a single-tower, multi-frequency self-supporting medium-wave transmission tower can overcome the shortcomings of existing technologies, increase transmission frequencies, improve seasonal adaptability, simplify the structure, and save costs. Summary of the Invention:

[0009] The purpose of this invention is to overcome the shortcomings of the existing technology. Based on the improvement of medium wave transmission towers, this invention designs a self-standing medium wave transmission tower that uses insulators to block multiple tower columns into multiple transmission units to achieve multi-frequency transmission. This solves the problems of existing transmission towers having fewer transmission frequencies, larger frequency intervals, greater impact of seasonal changes on transmission tower impedance, fixed height, and complex configuration networks.

[0010] To achieve the above objectives, this utility model provides a multi-frequency self-supporting medium-wave transmission tower. The overall structure consists of no fewer than three supporting columns and one central column. The supporting columns are evenly spaced and distributed on the circumference of the outside of the transmission tower. The central column is vertically erected at the center of the circumference where the supporting columns are located. The bottom ends of both the supporting columns and the central column are equipped with insulating bases. The top and middle of the central column are fixed to the supporting columns by insulating connecting rods. The central column is a conductor or an insulator and is used to fix the feeder for transmitting the transmission signal.

[0011] The supporting columns involved in this utility model are made of conductive material. Each pair of adjacent supporting columns are fixed by insulating connecting rods at the upper one-third and two-thirds points of the column, respectively. Each supporting column is divided into multiple conductors by an insulating device to form an independent transmitting unit. The position of the insulating device and the height of the supporting column are determined by the specific required transmitting frequency.

[0012] When the conductor length formed by the insulating device separating the support column is insufficient to become an independent transmitting unit, the insufficient conductor is connected with one or more other conductors in the same situation so that the equivalent length reaches the height required for a certain transmission frequency, thus becoming a new transmitting unit that can transmit at a normal frequency; or the insufficient conductor can be used alone to erect a frequency modulation or television transmitting antenna.

[0013] Compared with the prior art, this utility model has the following advantages: (1) This utility model can determine the height of each transmission unit according to the required transmission frequency and further adjust the tower column to achieve the best transmission effect; (2) This utility model does not need to consider the transmission frequency interval, can accommodate more transmission frequencies, and realize true one tower for multiple frequencies; (3) Compared with traditional transmission towers, it reduces the contact area with air, can be adapted to different seasonal changes, does not require manual adjustment of the network, has strong adaptability and high reliability; (4) It simplifies the circuit design and does not need to consider the transmission power of each frequency; its overall design is scientific and reasonable, the structure is simple, and it can effectively save land costs, reduce manpower requirements, and improve applicability. Attached image description:

[0014] Figure 1 This is a schematic diagram of the structural principle of the self-supporting medium-wave transmission tower involved in this utility model.

[0015] The components in the attached diagram are labeled as follows: Support column 1, Support column 2, Support column 3, Central column 4, Insulation device 1, Insulation device 2, Insulation device 3, Insulation device 4, Insulation device 5, Conductor 1, Conductor 2, Conductor 3, Conductor 4, Conductor 5, Conductor 6, Conductor 7, Conductor 8, Insulation device 9, Conductor 10, Conductor 2, Conductor 3, Conductor 4, Conductor 5, Conductor 6, Conductor 7, Conductor 8, Insulation base 18, Insulation connecting rod 19. Detailed implementation method:

[0016] Example 1:

[0017] This embodiment relates to a multi-frequency self-supporting medium-wave transmission tower. The overall structure consists of no fewer than three supporting columns and a central column 4. The supporting columns are evenly spaced and distributed on the circumference of the outside of the transmission tower. The central column 4 is vertically erected at the center of the circumference where the supporting columns are located. The bottom ends of the supporting columns and the central column 4 are provided with insulating bases 18. The top and middle of the central column 4 are fixed to the supporting columns by insulating connecting rods 19. The central column 4 is a conductor or an insulator and is used to fix the feeder for transmitting the transmission signal.

[0018] The support columns are made of conductive material. Each pair of adjacent support columns are fixed by insulating connecting rods 19 at the upper one-third and two-thirds of the column, respectively. Each support column is divided into multiple conductors by an insulating device to form an independent transmitting unit. The position of the insulating device and the height of the support column are determined by the specific required transmitting frequency.

[0019] When the conductor length formed by the insulating device separating the support column is insufficient to become an independent transmitting unit, the conductor with insufficient length is connected with one or more other conductors in the same situation so that the equivalent length reaches the height required for a certain transmission frequency, thus becoming a new transmitting unit that can transmit normally at the frequency; or the conductor with insufficient length can be used alone to erect a frequency modulation or television transmitting antenna.

[0020] This embodiment involves a multi-frequency self-supporting medium-wave transmission tower comprising three supporting columns: Support Column 1, Support Column 2, and Support Column 3. Support Column 1 is divided into Conductor 10, Conductor 21, and Conductor 312 by Insulation Device 15 and Insulation Device 26. Support Column 2 is divided into Conductor 413, Conductor 514, and Conductor 615 by Insulation Device 37 and Insulation Device 48. Support Column 2 is divided into Conductor 716 and Conductor 817 by Insulation Device 59. When the conductor length is sufficient to function as an independent transmission unit, Conductors 10 to 817 can all transmit signals of different frequencies as independent transmission units. When the conductor length at the top of the supporting column is insufficient to function as an independent transmission unit, conductor material is used to connect the tops of one or more conductors that are too short, allowing them to be used as normal transmission units.

[0021] The present invention relates to conductors of insufficient length, namely conductor 3 (12), conductor 6 (15), and conductor 8 (17). The solution for insufficient length is as follows:

[0022] (1) Connect conductor 312 and conductor 615 with a conductor material so that conductor 312 and conductor 615 become an independent transmitting unit;

[0023] (2) Connect conductor 312 and conductor 817 with a conductor material so that conductor 312 and conductor 817 become an independent transmitting unit;

[0024] (3) Connect conductor 6 15 and conductor 8 17 respectively with conductor material so that conductor 6 15 and conductor 8 17 become an independent transmitting unit;

[0025] (4) Connect conductors 312, 615 and 817 with conductor materials respectively, so that conductors 312, 615 and 817 become an independent transmitting unit.

[0026] In this embodiment, the conductor material used to connect conductors that are not long enough is a coaxial cable.

[0027] Based on the design principle of a quarter-wavelength monopole antenna (vertical antenna), a transmission frequency of 526.5 kHz requires approximately 135 meters of conductor, 540 kHz requires approximately 131.6 meters, 828 kHz requires approximately 85.4 meters, 1000 kHz requires approximately 71 meters, 1200 kHz requires approximately 59.3 meters, and 1606.5 kHz requires approximately 44 meters. By shortening the length through techniques such as adding inductive coils, the conductor length can be reduced to 66-15 meters. A medium-height transmission tower can accommodate five or more different transmission frequency units.

[0028] Example 2:

[0029] The purpose of this embodiment is to verify the difference between the self-supporting medium-wave transmission tower involved in Embodiment 1 and the ordinary medium-wave transmission tower in the prior art in terms of the number of transmission frequencies and network adjustment frequencies.

[0030] (1) Experimental equipment:

[0031] Experimental group: Using the self-supporting medium-wave transmission tower of Example 1;

[0032] Control group: Conventional medium-wave transmission towers using existing technology;

[0033] (2) Experimental methods:

[0034] In the same environment, the experimental group and the control group were tested, and the number of frequencies they could transmit, the signal interference rate, and the number of network adjustments throughout the year were recorded.

[0035] (3) Experimental results:

[0036] Table 1:

[0037]

[0038] As can be seen from Table 1, the multi-frequency self-supporting medium-wave transmission tower involved in this embodiment can effectively increase the number of different transmission frequencies, arrange multiple transmission units on the same tower body, effectively reduce land use, reduce the occupation of green resources, and is scientific and environmentally friendly; it has a low signal interference rate, a simple structure and dispatch network, ignores seasonal influences, reduces manpower usage, saves costs, has strong applicability, and is conducive to promoting the development of technology in the field of information dissemination.

Claims

1. A self-supporting medium-wave transmission tower with multiple frequencies, characterized in that, It consists of no fewer than three supporting columns and one central column. The supporting columns are evenly spaced and distributed on the circumference outside the launch tower. The central column is vertically erected at the center of the circumference where the supporting columns are located. The bottom of the supporting columns is equipped with an insulating base. The top and middle of the central column are fixed to the supporting columns by insulating connecting rods.

2. The multi-frequency self-supporting medium-wave transmission tower according to claim 1, characterized in that: The central pillar is a conductor or an insulator.

3. The multi-frequency self-supporting medium-wave transmission tower according to claim 2, characterized in that: When the central column is a conductor, an insulating base is provided at its grounded bottom end.

4. The multi-frequency self-supporting medium-wave transmission tower according to claim 1, characterized in that: The supporting columns are made of conductive material. Each pair of adjacent supporting columns are fixed together by insulating connecting rods at the top and middle of the column. Each supporting column is divided into multiple conductors by an insulating device to form an independent transmitting unit. The position of the insulating device and the height of the supporting column are determined by the specific required transmitting frequency.

5. The multi-frequency self-supporting medium-wave transmission tower according to claim 4, characterized in that: Each pair of adjacent support columns is fixed together by insulating connecting rods at the upper one-third and two-thirds points of the column, respectively.

6. The multi-frequency self-supporting medium-wave transmission tower according to claim 4, characterized in that: When the conductor length formed by the insulating device separating the support column is insufficient to become an independent transmitting unit, the insufficient conductor is connected to one or more other conductors in the same situation so that the equivalent length reaches the height required for a certain transmitting frequency, thus becoming a new transmitting unit.

7. The multi-frequency self-supporting medium-wave transmission tower according to claim 4, characterized in that: When the conductor length formed by the insulating device separating the support column is insufficient to become an independent transmitting unit, it can be used separately to erect an FM or television transmitting antenna.

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