CN218243853U - Power transmission line non-signal area operation and maintenance communication system - Google Patents

Abstract

The application relates to an operation maintenance communication system for a signal-free area of a power transmission line, which comprises a master station background, a gathering station and an online monitoring assembly, at least one Mesh mobile base station and at least one handheld terminal, wherein the gathering station and the online monitoring assembly are arranged on each power transmission iron tower; the aggregation site comprises a Mesh base station and a power transmission line state monitoring agent device which are connected. According to the method and the device, remote communication is achieved by arranging a plurality of aggregation sites, and meanwhile, related data of the power transmission line can be monitored in real time through the power transmission line state monitoring agent device and the plurality of online monitoring assemblies, so that faults can be found and solved in time. The operation and maintenance data can be transmitted back to the master station background through the Mesh mobile base station and the handheld terminal, remote video and voice communication is realized through the handheld terminal, and meanwhile, the communication cost is also reduced; each equipment can be installed fast and conveniently through the quick installing support that sets up, has alleviateed the burden of high altitude construction.

Description

Power transmission line non-signal area operation and maintenance communication system

Technical Field

The application relates to the technical field of power transmission lines, in particular to a communication system for operation, maintenance and overhaul of a signal-free area of a power transmission line.

Background

Along with the construction of ultrahigh voltage interconnected power grids in China, more and more power transmission and transformation facilities pass through areas with severe natural and geographical conditions, and a plurality of power transmission channels in southwest areas are located in high-altitude and high-cold mountainous areas and unmanned areas, so that great inconvenience is brought to operation, maintenance and repair work of a circuit.

The prior art proposal provides a satellite communication scheme, and field operation and maintenance personnel are equipped with related satellite communication equipment when working, and realize related data return and communication requirements through satellite communication when needed; in the scheme, a wifi + microwave communication point-to-point transmission mode is provided to realize network communication in a no-signal area, and wifi routing equipment is arranged on a power transmission iron tower to realize on-site network coverage; the communication link adopts a wireless network bridge to realize data transmission to a public network signal or a master station background. However, the above two schemes have the following problems respectively: the satellite communication can only realize the basic voice call function of operation and maintenance personnel, the communication cost is high, and the operation and maintenance communication requirements of the power transmission line in a signal-free area cannot be met; the WiFi + microwave communication scheme can solve the problem that the device does not have signal area network communication and can also provide network connection for other equipment, but the communication range is only dozens of meters or hundreds of meters, and the requirement of communication at a distance of kilometers in the field environment is difficult to meet.

In addition, the existing communication equipment is installed on a power transmission iron tower which is mostly made of angle steel, when the communication equipment or other equipment is installed, a mounting plate with a prefabricated bolt hole is fixed on the angle steel of the power transmission iron tower through a U-shaped bolt, and then the equipment is fixedly connected with the mounting plate through the bolt.

Disclosure of Invention

The technical problem that this application will be solved provides a transmission line no signal district operation and maintenance communication system that communication distance is far away, realize video voice communication function, communication cost are lower relatively.

In order to solve the problems, the application provides a communication system for operation, maintenance and overhaul of a signal-free area of a power transmission line, which comprises a master station background, a gathering station and an online monitoring assembly, at least one Mesh mobile base station and at least one handheld terminal, wherein the gathering station and the online monitoring assembly are arranged on each power transmission iron tower; the aggregation site comprises a Mesh base station and a power transmission line state monitoring agent device which are connected, wherein the Mesh base station is used for providing Mesh network coverage and can be simultaneously accessed to a plurality of Mesh mobile base stations; the Mesh mobile base station is used for being in signal connection with any Mesh base station and providing a wireless network for the handheld terminal; the transmission line state monitoring agent devices at all levels are connected through a wireless network bridge and realize the step-by-step transmission of related data, wherein the related data comprises state monitoring data and handheld terminal data; and the last stage of the power transmission line state monitoring agent device is connected with the master station background in a wired mode, and the master station background is used for collecting and processing relevant data of the whole link.

Preferably, the aggregation site further comprises a power supply assembly connected with both the Mesh base station and the transmission line state monitoring proxy device.

Preferably, the Mesh base station is a Mesh base station device of an ME62-1400 model, the Mesh mobile base station is a Mesh mobile base station device of an ME32 model, and/or the power transmission line state monitoring agent device is a power transmission line state monitoring agent device of an IDC3.0 model.

Preferably, the handheld terminal is a smart phone or a tablet computer.

Preferably, the gathering station and the online monitoring assembly are fixed on corresponding transmission towers through quick mounting brackets, each quick mounting bracket comprises a supporting rod, a mounting plate arranged at one end of the corresponding supporting rod through a detachable structure, and a first clamping plate, a second clamping plate and an inserting plate arranged at the other end of the corresponding supporting rod; first splint and the parallel interval of second splint set up on the bracing piece, and with the bracing piece forms U type holder, first splint and second splint are keeping away from be equipped with the confession on the opposite face of bracing piece one side picture peg male draw-in groove, the picture peg insert the back with the rectangle space that U type holder formed with the shape size of angle steel suits on the steel pylons.

Preferably, the detachable structure comprises a rectangular sleeve arranged on the mounting plate, a connecting rod arranged at the end part of the supporting rod and an inserting rod of which the top is provided with a limiting block; the rectangle sleeve pipe with all be equipped with the confession on the connecting rod the penetrable jack of inserted bar, the connecting rod is kept away from the one end of bracing piece can stretch into the rectangle sleeve pipe makes both the jack aligns.

Preferably, the connecting rod is connected with the supporting rod through a rotating structure.

Preferably, the rotating structure comprises a fixed rod arranged on the support rod, a circular hole which is arranged at one end of the connecting rod close to the support rod and penetrates through the support rod up and down, and a rotating shaft which penetrates through the circular hole; the bottom of the rotating shaft is in threaded connection with the fixed rod, and the top of the rotating shaft is provided with an end cap with an outer diameter larger than the round hole.

Preferably, the length of the supporting rod is adjustable.

Preferably, the support rod is a multi-layer sleeve pipe stacking telescopic structure, and a puller bolt for limiting relative sliding of the two adjacent sleeve pipes is arranged between the two adjacent sleeve pipes.

Compared with the prior art, the method has the following advantages:

1. through a plurality of stations that assemble that set up, alright realize long-distance communication, alright real-time monitoring transmission line's relevant data through transmission line state monitoring agent device and a plurality of on-line monitoring subassembly simultaneously, be convenient for in time discover the trouble and solve the trouble.

2. Through Mesh mobile base station and handheld terminal, alright with the operation and maintenance data passback to main website backstage, realize remote video voice communication through handheld terminal, also reduced communication cost simultaneously.

3. Through the quick installing support that sets up alright each equipment of quick, convenient installation, lightened high altitude construction's burden.

Drawings

The following description of the embodiments of the present application will be made in detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a power transmission line signal-free area operation and maintenance communication system provided in an embodiment of the present application.

Fig. 2 is a schematic structural view of the quick mounting bracket provided in the embodiment of the present application, which is fixed to an angle steel.

Fig. 3 is a schematic structural view of a clamping groove on the first clamping plate and the second clamping plate according to the embodiment of the application.

Fig. 4 is a schematic structural diagram of a combination of a mounting plate and a rectangular sleeve provided in an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a connecting rod provided in an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a rotating structure provided in an embodiment of the present application.

Fig. 7 is a schematic structural diagram of a fixing rod in a rotating structure provided in an embodiment of the present application.

In the figure: the mounting plate comprises a mounting plate 1, a connecting rod 2, a supporting rod 3, a first rod body 301, a second rod body 302, a first clamping plate 4, a second clamping plate 5, an inserting plate 6, a mounting hole 7, angle steel 8, a first clamping groove 9, a second clamping groove 10, a rectangular sleeve 11, an inserting rod 12, a limiting block 13, a fixing rod 14, a threaded hole 15, a round hole 16, a rotating shaft 17, an end cap 18, an inner hexagonal groove 19, a sliding groove 20, a puller bolt 21 and a jack 22.

Detailed Description

Referring to fig. 1, an embodiment of the present application provides an operation and maintenance communication system for a signal-free area of a power transmission line, where the communication system mainly includes a master station background, multiple aggregation sites, multiple online monitoring components, at least one Mesh mobile base station, and at least one handheld terminal; one gathering station and one on-line monitoring assembly correspond to one power transmission tower and are fixed on the corresponding power transmission tower through a quick mounting bracket. The specific structure of the quick-mounting bracket is described later.

Each aggregation site mainly comprises a Mesh base station and a power transmission line state monitoring agent device, wherein the Mesh base station is used for providing Mesh network coverage of the aggregation site, providing Mesh network coverage for a square circle within 30km range and simultaneously being capable of being accessed to a plurality of Mesh mobile base stations. And the Mesh base station is in signal connection with the transmission line state monitoring agent device. In practical application, each aggregation site further comprises a power supply assembly connected with the Mesh base station and the transmission line state monitoring agent device.

The transmission line state monitoring agent device of the current-stage convergence station is in signal connection with the transmission line state monitoring agent device of the upper-stage convergence station through wireless bridges, each convergence station is provided with two wireless bridges, one wireless bridge is used for being paired with one wireless bridge in the upper-stage convergence station to achieve wireless transmission, the other wireless bridge is paired with one wireless bridge in the lower-stage convergence station to achieve wireless transmission, the transmission line state monitoring agent device of the current-stage convergence station is used for converging state monitoring data of the transmission line state monitoring agent device of the upper-stage convergence station, namely the data information of the convergence station is forwarded from far to near step by step, and the wireless bridge of the convergence station closest to the background of the main station is accessed to the background of the main station through an optical fiber to achieve data transmission. The master station background is used for collecting and processing relevant data of the whole link, and the relevant data comprises state monitoring data and handheld terminal data.

Each online monitoring component comprises at least one of tower inclination online monitoring equipment, wire sag online monitoring equipment, wire temperature online monitoring equipment, breeze vibration online monitoring equipment, windage yaw online monitoring equipment, icing online monitoring equipment, insulator pollution degree online monitoring equipment, microclimate online monitoring equipment and image online monitoring equipment, each online monitoring equipment is connected with each online monitoring equipment through a data interface (zigbee, 232, 485, RJ45 and other data interfaces) of a power transmission line state monitoring agent device of a corresponding gathering station, the power transmission line state monitoring agent device collects data information of each online monitoring equipment, the monitoring equipment can be selected according to actual requirements, and one of the monitoring equipment and a plurality of monitoring equipment can be selected for combined use.

The Mesh mobile base station is used for being in signal connection with the Mesh base station of any one gathering station, in practical application, the Mesh mobile base station is carried by maintenance personnel, and the Mesh mobile base station can be communicated with the Mesh base station through a Mesh network and can also provide a wireless network for a handheld terminal to be networked; and the handheld terminal returns the operation and maintenance data back and realizes voice and video communication through a wireless network provided by the Mesh mobile base station.

In practical application, the Mesh base station can adopt Mesh base station equipment of ME62-1400 type. The Mesh mobile base station may adopt Mesh mobile base station equipment of an ME32 model, and the power transmission line state monitoring agent device may adopt a power transmission line state monitoring agent device of an IDC3.0 model. The power supply assembly adopts a solar power supply assembly, adopts solar power supply, and is environment-friendly and energy-saving. The handheld terminal is a mobile phone or a tablet computer. Mesh mobile base station equipment of ME32 model.

Referring to fig. 2 to 3, in the present application, the aggregation site and the on-line monitoring assembly are fixed on the corresponding transmission tower through a quick mounting bracket, which mainly comprises a support rod 3, a mounting plate 1 arranged at the left end of the support rod 3 through a detachable structure, and a first clamping plate 4, a second clamping plate 5 and a plugboard 6 arranged at the right end of the support rod 3. A plurality of mounting holes 7 are prefabricated on the mounting plate 1, and the mounting plate 1 and corresponding equipment can be fixed together through the mounting holes 7 and mounting bolts.

First splint 4 and the parallel interval setting of second splint 5 are on bracing piece 3 to form U type holder with bracing piece 3, first splint 4 and second splint 5 are equipped with on the opposite face of keeping away from bracing piece 3 one side and supply picture peg 6 male draw-in groove (first draw-in groove 9 and second draw-in groove 10), and the rectangle space that picture peg 6 inserted back and U type holder formed suits with the shape size of angle steel on the steel pylons.

When the clamping device is used, the opening of the U-shaped clamping piece is downwards placed right above angle steel 8 of the power transmission iron tower at the right end of the supporting rod 3, then the U-shaped clamping piece moves downwards to enable the angle steel 8 to be located between the first clamping plate 4 and the second clamping plate 5, and meanwhile the lower surface of the supporting rod 3 is in contact with the angle steel 8; the left end and the right end of the inserting plate 6 are aligned to the first clamping groove 9 and the second clamping groove 10 and inserted, so that the four sides of the angle steel 8 are completely wrapped by the supporting rod 3, the first clamping plate 4, the second clamping plate 5 and the inserting plate 6, the whole mounting bracket can be fixed on the angle steel 8, the connection is convenient, and the trouble of fixing a traditional U-shaped bolt is eliminated. Then, the mounting panel 1 that will be fixed with corresponding equipment passes through detachable construction and fixes mounting panel 1 at the left end of bracing piece 3, can realize the quick installation of equipment. The fixing of the mounting plate 1 and the corresponding equipment can be completed on the ground in advance, and the procedures of high-altitude operation are reduced.

With regard to the structure of the support bar 3, the first clamping plate 4, the second clamping plate 5 and the insert plate 6, more specifically: the right end of the supporting rod 3 is fixedly arranged at the upper end edge of the left side surface of the first clamping plate 4 and is vertical to the upper end edge, the right end of the supporting rod 3 is positioned at the middle part of the front and back directions of the first clamping plate 4, the upper end of the right side surface of the second clamping plate 5 is provided with a through hole matched with the supporting rod 3, the through hole is positioned at the middle part of the front and back directions of the second clamping plate 5, the second clamping plate 5 is sleeved on the supporting rod 3 through the through hole and is fixedly connected with the supporting rod 3, the distance between the first clamping plate 4 and the second clamping plate 5 is matched with the width of an angle steel 8 of an iron tower, the lower end of the left side surface of the first clamping plate 4 is provided with a first clamping groove 9 along the front and back directions, the depth of the first clamping groove 9 is less than or equal to half of the thickness of the first clamping plate 4, the front end of first draw-in groove 9 extends to the preceding terminal surface of first splint 4, the length of first draw-in groove 9 is less than the length of the fore-and-aft direction of first splint 4, the right side surface lower extreme of second splint 5 is provided with second draw-in groove 10 and sets up with first draw-in groove 9 bilateral symmetry, distance between the tank bottom of first draw-in groove 9 and the tank bottom of second draw-in groove 10 and the width looks adaptation of picture peg 6, the length more than or equal to length of first draw-in groove 9 of picture peg 6, both ends are located first draw-in groove 9 and second draw-in groove 10 respectively and the two interference fit about picture peg 6, the rear end of picture peg 6 contacts with the back lateral wall of first draw-in groove 9, the distance between the upper surface of picture peg 6 and the lower surface of bracing piece 3 and the width looks adaptation of the angle steel 8 of iron tower.

In this application, be connected through detachable construction between bracing piece 3 and the mounting panel 1, can dismantle the connected mode and make things convenient for the dismantlement and the installation of mounting panel 1. In practical applications, referring to fig. 2, fig. 4 and fig. 5, in the present application, the detachable structure mainly includes a connecting rod 2, a rectangular sleeve 11 adapted to the connecting rod 2, an inserting rod 12 and a limiting block 1; the fixed central point that sets up on the right flank surface of mounting panel 1 of left end of rectangle sleeve pipe 11 puts, the left end of connecting rod 2 stretches into in the rectangle sleeve pipe 11, rectangle sleeve pipe 11's last lateral wall surface is provided with jack 22, rectangle sleeve pipe 11's last lateral wall is run through in proper order to jack 22's lower extreme, connecting rod 2, rectangle sleeve pipe 11's lower lateral wall, be provided with the inserted bar 12 of looks adaptation with it in the jack 22, the length more than or equal to jack 22's of inserted bar 12 the degree of depth, inserted bar 12 and jack 22 interference fit, the upper end of inserted bar 12 is provided with stopper 13, stopper 13's cross sectional area is greater than inserted bar 12's cross sectional area.

During disassembly, the insertion rod 12 is pulled out upwards forcibly, and then the mounting plate 1 is moved leftwards, so that the rectangular sleeve 11 is separated from the connecting rod 2, and the mounting plate 1 is disassembled; when the device is installed, the right end of the rectangular sleeve 11 is aligned with the left end of the connecting rod 2, then the right end of the rectangular sleeve is moved to the right, the rectangular sleeve 11 can be completely sleeved on the connecting rod 2, and finally the inserted rod 12 is inserted into the inserting hole 22.

In this application, realize being connected through rotating-structure between connecting rod 2 and the bracing piece 3, rotate the connected mode and can realize the angle modulation of mounting panel 1 in the horizontal direction, the regulation of pairing of some equipment of being convenient for, for example pair between two adjacent wireless bridges, just need the regulation of angle direction. In practical applications, referring to fig. 2, 5 to 7, in the present application, the rotating structure mainly includes a fixing rod 14 disposed on the supporting rod 3, a circular hole 16 disposed at one end of the connecting rod 2 close to the supporting rod 3 and penetrating vertically, and a rotating shaft 17 penetrating inside the circular hole 16; the bottom of the rotating shaft 17 is connected with the fixed rod 14 through threads, and the top of the rotating shaft is provided with an end cap 18 with the outer diameter larger than that of the round hole 16. When needing to rotate, operation end cap 18 unscrews pivot 17, alright with the right-hand member of connecting rod 2 around pivot 17 rotate, and then take mounting panel 1 to rotate to realize the regulation of angle, angle adjustment is suitable back, and operation end cap 18 screws up pivot 17, makes connecting rod 2 sticiss between end cap 18 and dead lever 14.

With regard to the above-described rotating structure, more specifically: the fixed left end and the two mutually perpendicular of establishing at the bracing piece 3 upper surface of the lower extreme of dead lever 14, the upper surface central point of dead lever 14 puts and is provided with screw hole 15, the right-hand member of connecting rod 2 is located the up end of dead lever 14, the right-hand member of the upper surface of connecting rod 2 is provided with the round hole 16 that runs through from top to bottom, the diameter of round hole 16 is the same with the diameter of screw hole 15 and the coincidence of the central axis of the two, be provided with pivot 17 in the round hole 16, the lower extreme of pivot 17 is provided with the external screw thread and with the internal thread looks adaptation of screw hole 15, the lower extreme of pivot 17 stretches into to screw hole 15 in, the thickness that the length of pivot 17 is greater than connecting rod 2 is less than the degree of depth and the thickness sum of screw hole 15 and connecting rod 2, the upper end of pivot 17 is provided with end cap 18, the central point of the up end of end cap 18 is provided with interior hexagonal recess 19.

When the angle of mounting panel 1 needs to be adjusted, insert the not hard up pivot 17 of hexagon socket head cap recess 19 through hexagon socket head cap spanner for there is the clearance between end cap 18 and the connecting rod 2, like this alright revolve the pivot 17 with the right-hand member of connecting rod 2 and rotate, and then take mounting panel 1 to rotate, thereby realize the regulation of angle, adjust the back that finishes, insert hexagon socket head cap recess 19 through hexagon socket head cap spanner and rotate pivot 17, make end cap 18 push down connecting rod 2 tightly make it fixed can.

In this application, bracing piece 3's length is adjustable, and it is different to the demand of distance to satisfy different equipment, and some equipment probably need fix in power transmission tower's the outside, and some equipment fix inside can. In practical applications, referring to fig. 2 and fig. 6, in the present application, the support rod 3 may be a multi-layer sleeve stacked telescopic structure, and a tightening bolt 21 for limiting relative sliding between two adjacent sleeves is disposed between the two sleeves.

Regarding the implementation manner of the multi-layer sleeve overlapping telescopic structure of the support rod 3, for example: the bracing piece 3 includes the first body of rod 301, the second body of rod 302, the first body of rod 301, the cross-section of the second body of rod 302 is the rectangle, the right-hand member face area of the second body of rod 302 is greater than the area of the first body of rod 301 right-hand member face, the right-hand member face of the second body of rod 302 is provided with the spout 20 that runs through about, the size of spout 20 and the big or small looks adaptation of the left end face of the first body of rod 301, the left end of the first body of rod 301 stretches into in the spout 20, the right-hand member of the last lateral wall of the second body of rod 302 is provided with the puller bolt 21 that is used for restricting the first body of rod 301 and the relative slip of the second body of rod 302, the fixed left end that sets up at the second body of rod 302 upper surface of lower extreme of dead lever 14, the fixed right-hand member that sets up at the first body of rod 301 of first splint 4, the right-hand member of the first body of rod 301 is established to second splint 5 cover and is located the left side of first splint 4.

When adjusting the length of bracing piece 3, only need not hard up puller bolt 21, then make first body of rod 301, the second body of rod 302 be close to relatively or keep away from relatively, alright realize the regulation of the length of bracing piece 3, it can to adjust the fastening of puller bolt 21 after finishing.

The technical solutions provided in the present application are described in detail above. The principle and the implementation of the present application are explained by applying specific examples, and the above description of the embodiments is only used to help understand the structure and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims (10)

1. A communication system for operation, maintenance and overhaul in a signal-free area of a power transmission line is characterized by comprising a master station background, a gathering station and an online monitoring assembly, at least one Mesh mobile base station and at least one handheld terminal, wherein the gathering station and the online monitoring assembly are arranged on each power transmission iron tower; the aggregation site comprises a Mesh base station and a power transmission line state monitoring agent device which are connected, wherein the Mesh base station is used for providing Mesh network coverage and can be simultaneously accessed to a plurality of Mesh mobile base stations; the Mesh mobile base station is used for being in signal connection with any Mesh base station and providing a wireless network for the handheld terminal; the transmission line state monitoring agent devices at all levels are connected through a wireless network bridge and realize the step-by-step transmission of related data, wherein the related data comprises state monitoring data and handheld terminal data; and the power transmission line state monitoring agent device at the last stage is connected with the master station background in a wired mode, and the master station background is used for collecting and processing relevant data of the whole link.

2. The communication system of claim 1, wherein the aggregation site further comprises a power supply component connected to both the Mesh base station and the transmission line state monitoring agent device.

3. The communication system according to claim 1, wherein the Mesh base station is a Mesh base station device of a model ME62-1400, the Mesh mobile base station is a Mesh mobile base station device of a model ME32, and/or the transmission line state monitoring agent device is a transmission line state monitoring agent device of a model IDC 3.0.

4. The communication system of claim 1, wherein the handheld terminal is a smartphone or a tablet computer.

5. The communication system according to any one of claims 1 to 4, wherein the aggregation site and the online monitoring component are fixed on the corresponding transmission towers through quick mounting brackets, each quick mounting bracket comprises a support rod (3), a mounting plate (1) arranged at one end of the support rod (3) through a detachable structure, and a first clamping plate (4), a second clamping plate (5) and an inserting plate (6) arranged at the other end of the support rod (3); first splint (4) and second splint (5) parallel interval set up on bracing piece (3), and with bracing piece (3) form U type holder, first splint (4) and second splint (5) are keeping away from be equipped with the confession on the opposite face of bracing piece (3) one side picture peg (6) male draw-in groove (9, 10), picture peg (6) insert the back with the rectangle space that U type holder formed with the shape size of angle steel suits on the iron tower.

6. The communication system according to claim 5, wherein the detachable structure comprises a rectangular sleeve (11) arranged on the mounting plate (1), a connecting rod (2) arranged at the end of the supporting rod (3), and an inserting rod (12) provided with a limiting block (13) at the top; rectangle sleeve pipe (11) with all be equipped with the confession on connecting rod (2) jack (22) that inserted bar (12) pierce through, connecting rod (2) are kept away from the one end of bracing piece (3) can stretch into rectangle sleeve pipe (11) make both jack (22) align.

7. The communication system according to claim 6, wherein the connection between the connecting rod (2) and the support rod (3) is achieved by a rotating structure.

8. The communication system according to claim 7, wherein the rotating structure comprises a fixing rod (14) disposed on the supporting rod (3), a circular hole (16) disposed at one end of the connecting rod (2) close to the supporting rod (3) and penetrating up and down, and a rotating shaft (17) disposed inside the circular hole (16); the bottom of the rotating shaft (17) is in threaded connection with the fixing rod (14), and the top of the rotating shaft is provided with an end cap (18) with the outer diameter larger than that of the round hole (16).

9. A communication system according to claim 5, characterized in that the length of the support bar (3) is adjustable.

10. The communication system according to claim 9, wherein the support rod (3) is a multi-layer sleeve pipe stacked telescopic structure, and a tightening bolt (21) for limiting the relative sliding between two adjacent sleeve pipes is arranged between the two sleeve pipes.

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