Relay device for wireless communication

Abstract

The invention discloses relay equipment for wireless communication, which belongs to the technical field of communication equipment, and comprises a signal receiver used for receiving an analog signal or a digital signal sent by a transmission medium; the A / D converter is used for converting an analog signal in the signal receiver into a digital signal and transmitting the digital signal to the signal amplifier; the signal amplifier is used for realizing amplification and mute noise reduction processing on the digital signal through an amplification noise reduction circuit; and the transmission module is used for transmitting the digital signal processed by the signal amplifier to the next repeater so as to realize continuous transmission of the signal. According to the invention, the technical problems that heat dissipation needs to be carried out on the electronic component at the ventilation opening in the working process, external dust is large in an open state, dust particles are not easy to remove under the condition of aggregation, electrostatic damage is possibly generated for the electronic component, and safe use of the product is not facilitated can be solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of communication devices, and particularly relates to a relay device for wireless communication. Background Art

[0002] A repeater is a connecting device operating at the physical layer. It is applicable to the interconnection of two completely identical networks. Its main function is to expand the network transmission distance by retransmitting or forwarding data signals. A repeater is a network device that regenerates and restores signals: a device at the physical layer of the OSI model. A repeater is used to extend the network distance in a local area network environment. However, it belongs to a network interconnection device and operates at the physical layer of the OSI. A repeater has the function of amplifying and regenerating signals on the line and is used to extend the length of a local area network segment.

[0003] A repeater is a device for connecting network lines and is commonly used for the two-way forwarding of physical signals between two network nodes. A repeater mainly completes the functions of the physical layer, is responsible for transmitting information bit by bit on the physical layer of two nodes, and completes the functions of signal replication, adjustment, and amplification to extend the network length. A wireless communication repeater uses wireless signals for transmission, is easy to install, and is suitable for scenarios such as homes and small offices that require rapid expansion of the wireless network coverage.

[0004] During the use of a wireless communication relay device, the following problems will occur. When the repeater is placed in an outdoor environment, since the ventilation port needs to dissipate heat from the electronic components during operation, it needs to be kept open all the time. However, in the open state, there is a large amount of external dust. When dust particles accumulate, they are not easy to remove, and static electricity damage may also occur to the electronic components, which is not conducive to the safe use of the product. In addition, when the signal is being transmitted, if the distance is far or there is interference from other signals, corresponding noise or weak signal phenomena will also occur, thus reducing the effective application of the repeater. Summary of the Invention

[0005] The purpose of the present invention is to provide a relay device for wireless communication to solve the technical problems that when the ventilation port needs to dissipate heat from the electronic components during operation, there is a large amount of external dust in the open state, it is not easy to remove dust particles when they accumulate, and static electricity damage may also occur to the electronic components, which is not conducive to the safe use of the product.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions: A relay device for wireless communication, comprising: A signal receiver, which is used to receive analog signals or digital signals sent through a transmission medium; An A / D converter that converts the analog signal in the signal receiver into a digital signal and transmits it to the signal amplifier; A signal amplifier that performs amplification and noise reduction processing on the digital signal through an amplification and noise reduction circuit; A transmission module that transmits the digital signal processed by the signal amplifier to the next repeater to achieve continuous signal transmission.

[0007] Furthermore, the repeater includes a housing with air vents. Inside the housing, a carrier platform connected to the signal receiver, A / D converter, and signal amplifier is installed on the inner wall. Above the carrier platform, a baffle integrally formed at the top of the inner wall of the housing is provided. A bimetallic strip is detachably installed on the baffle. The bimetallic strip includes an active layer and a passive layer. An air ventilation shielding mechanism is provided outside the passive layer inside the housing.

[0008] Furthermore, the air ventilation shielding mechanism includes a guide ring fixed to the top of the inner wall of the housing. A push rod is movably connected to the inner wall of the guide ring. One end of the push rod abuts and fits against the passive layer, and the other end extends to the outer wall of the U-shaped plate. First inclined surfaces are provided at both ends of the outer wall of the U-shaped plate at the corners. Fixed blocks are provided on the inner wall of the housing outside the first inclined surfaces. Second inclined surfaces adapted to the first inclined surfaces are provided at both ends of the fixed blocks.

[0009] Furthermore, ventilation holes extending to the air vents are provided at both ends of the outer wall of the U-shaped plate. A chute is connected along the length direction of the protruding part of the U-shaped plate along the inner wall of the housing. Inclined plates are provided on the inner wall of the housing and are staggered between the ventilation holes and the air vents. A pull-out box movably arranged at the bottom of the inner wall of the housing is provided below the inclined plates. A handle is integrally formed on the pull-out box. A partition is provided between the pull-out box and the carrier platform.

[0010] Furthermore, both ends of the U-shaped plate and the movable end of the telescopic rod are connected by a swing rod. The fixed end of the telescopic rod abuts and fits against the outer wall of the U-shaped plate, and a sealing port is formed between the movable end of the telescopic rod and the top of the inner wall of the housing.

[0011] Furthermore, both ends of the swing rod are installed on the U-shaped plate and the movable end of the telescopic rod by means of rotational connection. A strip-shaped groove is connected along the height direction of the inner wall of the housing at the movable end of the telescopic rod.

[0012] Furthermore, both ends of the push rod are connected with gear plates through brackets. A rotating gear fixed on a rotating shaft is meshed and driven on the outer wall of the gear plate. The center of the rotating shaft penetrates through a protective cover and extends to the annularly distributed blades. One end of the blade is connected to the rotating shaft by means of plug-in installation. One end of the U-shaped plate and a side plate on the inner wall of the housing are connected by a compression spring.

[0013] Further, the amplification and noise reduction circuit includes a first resistor R1 and a second resistor R2 connected to the input signal. Both the first resistor R1 and the second resistor R2 are connected in parallel to the input terminal of the operational amplifier. A third resistor R3 is connected in series at the output terminal of the operational amplifier. The third resistor R3 is connected in parallel with a fourth resistor R4 and a fifth resistor R5 connected to the signal output terminal, and the third resistor R3 is connected in parallel to the collector of a first triode VT1 and the collector of a second triode VT2; The output terminals of the emitters of the first triode VT1 and the second triode VT2 are both grounded for protection. The base of the first triode VT1 is connected in series to a sixth resistor R6. The base of the second triode VT2 is connected in series to a seventh resistor R7 and is connected in parallel with the sixth resistor R6. The sixth resistor R6 is connected in parallel with a capacitor C grounded for protection and an eighth resistor R8 connected in series to the supply voltage VCC. The eighth resistor R8 and the supply voltage VCC are connected through a switch S.

[0014] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows: A transmission system is provided. Since an A / D converter is used in the repeater, analog signals can be converted into digital signals, thereby solving the technical problem that the signal amplifier in the repeater cannot amplify analog signals. At the same time, the amplification and noise reduction circuit in the signal amplifier can not only amplify the signal, but also effectively suppress noise, prevent distortion of the output of the repeater caused by signal interference, reduce the influence of noise and interference signals, and improve the accuracy and reliability of signal transmission of the repeater.

[0015] An automatic induction mechanism is provided. Under normal circumstances, the diversion groove inside the housing is closed, so that external dust cannot enter the interior of the electronic components, thus playing an effective role in blocking and protecting. At the same time, when the heat reaches a certain value, the active layer on the bimetal sheet is heated and deformed, driving the push rod to move outwards. In this way, the diversion groove formed between the U-shaped plate and the fixed block can be opened and corresponding heat dissipation ventilation can be carried out. Utilizing the elastic recovery effect of the compression spring, when the temperature drops, the active layer on the bimetal sheet returns to its original position. Due to the relatively small heat density, when it rises to the top of the inner wall of the housing, the push rod can drive the movement of the gear plate. Under the action of gear meshing transmission, the blades on both ends of the rotating shaft can rotate in the opposite direction, forming a diversion direction towards the air outlet. Under the action of the wind, the heat can be quickly exported. Moreover, during the movement of the U-shaped plate, under the rotational connection action of the swing rod, the movable end on the telescopic rod pulls downwards to open the sealing port, thereby facilitating the stable export of heat. The sealing port can play a secondary protection role for the working environment of the electronic components inside the housing when not in use, effectively ensuring the safety of the communication equipment during use.

[0016] A cleaning mechanism is provided. The air outlet on the housing can play a certain role in dissipating heat inside the housing, and the staggered inclined plates can play a role in dust blocking. The accumulated dust particles can be taken out and cleaned in time through the movable drawer box, so as to ensure the cleanliness inside the repeater.

[0017] An amplification and noise reduction circuit is provided. The signal is amplified once through an operational amplifier in the way of double signal input terminals. In this way, when one signal input is damaged, it will not affect the normal transmission of the signal. Then, the subsequent circuit composed of triodes can not only perform secondary amplification processing on the signal, but also perform mute and noise reduction processing on the signal. The isolation circuits R3 and R4 can prevent interference between different circuits and accidental touch from causing current to flow through irrelevant components or systems, and prevent signal distortion caused by signal interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 is the system schematic diagram of a wireless communication relay device of the present invention; Figure 2 is the structural schematic diagram of a wireless communication relay device of the present invention; Figure 3 is the present invention Figure 2 enlarged view of part A; Figure 4 is the meshing transmission schematic diagram of the gear plate and the rotating gear of the present invention; Figure 5 is the principle schematic diagram of the amplification and noise reduction circuit of the present invention.

[0020] Reference numerals: 1, signal receiver; 2, A / D converter; 3, signal amplifier; 4, transmission module; 5, air outlet; 6, bearing platform; 7, baffle; 8, bimetallic strip; 9, active layer; 10, passive layer; 11, ventilation and shielding mechanism; 12, guide ring; 13, push rod; 14, U-shaped plate; 15, first inclined surface; 16, fixed block; 17, second inclined surface; 18, ventilation hole; 19, inclined plate; 20, drawer box; 21, telescopic rod; 22, movable end; 23, swing rod; 24, fixed end; 25, gear plate; 26, rotating gear; 27, blade; 28, compression spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] Refer to the attached drawings of the specification Figure 1 As shown, a relay device for wireless communication includes: a signal receiver 1, which is used to receive analog signals or digital signals sent through a transmission medium; an A / D converter 2, which converts the analog signals in the signal receiver 1 into digital signals and transmits them to a signal amplifier 3; a signal amplifier 3, which amplifies and silences and reduces noise of the digital signals through an amplification and noise reduction circuit; a transmission module 4, which transmits the digital signals processed by the signal amplifier 3 to the next repeater, thereby realizing continuous transmission of signals.

[0023] Specifically, the repeater operates at the physical layer of the OSI model. Its main function is to forward physical signals bidirectionally between network nodes, extend the coverage of the network, and ensure the complete transmission of information by replicating, adjusting, and amplifying signals. Therefore, it cannot transmit analog signals. So, in the present invention, an A / D converter 2 is added, which can convert analog signals into digital signals and then transmit them, facilitating the transmission of signals.

[0024] By setting up a transmission system, since the A / D converter 2 is adopted in the repeater, analog signals can be converted into digital signals, thereby solving the technical problem that the signal amplifier 3 in the repeater cannot amplify analog signals. At the same time, the amplification and noise reduction circuit in the signal amplifier 3 can not only amplify the signals, but also effectively suppress noise, prevent distortion of the signals output by the repeater caused by signal interference, reduce the influence of noise and interference signals, and improve the accuracy and reliability of signal transmission of the repeater. Refer to Figure 2 、 Figure 3 and Figure 4 , the repeater includes a housing with an air outlet 5 provided thereon. A carrier platform 6 connected to the signal receiver 1, the A / D converter 2, and the signal amplifier 3 is installed on the inner wall of the housing. Above the carrier platform 6, there is a baffle 7 integrally formed at the top of the inner wall of the housing. A bimetallic strip 8 is detachably installed on the baffle 7. The bimetallic strip 8 includes an active layer 9 and a passive layer 10. A ventilation shielding mechanism 11 is provided outside the passive layer 10 inside the housing.

[0025] An automatic sensing mechanism is set. Under normal circumstances, the diversion groove inside the housing is closed, so that external dust cannot enter the interior of the electronic components, thus playing an effective role in blocking and protecting. At the same time, when the heat reaches a certain value, the active layer 9 on the bimetallic strip 8 is heated and deformed, driving the push rod 13 to move outward. In this way, the diversion groove formed between the U-shaped plate 14 and the fixed block 16 can be opened and corresponding heat dissipation and ventilation can be carried out. Utilizing the elastic recovery effect of the compression spring 28, when the temperature decreases, the active layer 9 on the bimetallic strip 8 returns to its original position. Due to the relatively small heat density, when it rises to the top of the inner wall of the housing, the push rod 13 can drive the movement of the gear plate 25. Under the action of gear meshing transmission, the blades 27 on both ends of the rotating shaft can rotate in the reverse direction, forming a diversion direction towards the air outlet 5. Under the action of the wind, the heat can be quickly exported. Moreover, during the movement of the U-shaped plate 14, under the rotational connection action of the swing rod 23, the movable end 22 on the telescopic rod 21 is pulled downward to open the seal opening, thereby facilitating the smooth export of heat. The seal opening can play a secondary protection role for the working environment of the electronic components inside the housing when not in use, effectively ensuring the safety of the communication equipment during use. The setting of the carrier platform 6 can facilitate the support and placement of the electronic components inside the repeater. At the same time, the carrier platform 6 and the drawer box 20 are connected by a partition. On the one hand, the partition can ensure the sealing of the placement space of the electronic components on the carrier platform 6, and on the other hand, the partition can be set as a heat-conducting material, and part of the heat can also be exported through heat transfer.

[0026] Specifically, due to the different thermal expansion coefficients of each component layer of the bimetallic strip 8, when the temperature changes, the deformation of the active layer 9 is greater than that of the passive layer 10. As a result, the whole of the bimetallic strip 8 will bend towards the passive layer 10 side. With the pushing action on the bimetallic strip 8, it can drive the operation of the ventilation shielding mechanism 11. The push rod 13 moves in the guide ring 12, and the guide ring 12 can not only give the corresponding supporting force to the push rod 13, but also prevent the push rod 13 from deviating in position during the movement. Furthermore, the push rod 13 can accurately transfer the acting force to the U-shaped plate 14 during the movement.

[0027] During the movement of the U-shaped plate 14, it can drive the first inclined surface 15 to move synchronously, thereby opening the diversion groove between the first inclined surface 15 and the second inclined surface 17. Moreover, the setting of the two inclined surfaces can facilitate the sealed connection of the structural components and prevent the situation of generating a large acting pressure due to the small contact area during the contact process, thereby reducing the collision damage and improving the service life of the equipment.

[0028] In addition, the second inclined surface 17 provided at the other end of the fixed block 16 can buffer and regulate heat, concentrating the heat in the diversion groove, so as to facilitate subsequent centralized heat dissipation through the rotation of the blade 27. When the ventilation shielding mechanism 11 is not working, the diversion groove between the first inclined surface 15 and the second inclined surface 17 is in a closed state, belonging to a primary sealing structure. The movable end 22 of the telescopic rod 21 abuts and fits against the top of the inner wall of the housing, acting as a secondary sealing structure. When the U-shaped plate 14 moves to the right, the diversion groove in the primary sealing structure opens. At the same time, under the rotational connection of the swing rod 23, the movable end 22 of the telescopic rod 21 moves away from the inner wall of the housing, thus opening the sealing port of the secondary sealing structure. This can effectively facilitate the normal circulation of heat, and when not in use, it can effectively ensure the tightness of the working environment of the electronic components and effectively prevent external dust particles from entering the housing interior.

[0029] The ventilation shielding mechanism 11 includes a guide ring 12 fixed to the top of the inner wall of the housing. A push rod 13 is movably connected to the inner wall of the guide ring 12. One end of the push rod 13 abuts and fits against the passive layer 10, and the other end extends to the outer wall of the U-shaped plate 14. First inclined surfaces 15 are provided at both ends of the outer wall of the U-shaped plate 14. A fixed block 16 is provided on the inner wall of the housing outside the first inclined surfaces 15. Second inclined surfaces 17 adapted to the first inclined surfaces 15 are provided at both ends of the fixed block 16.

[0030] Specifically, ventilation holes 18 extending to the air outlet 5 are opened at both ends of the outer wall of the U-shaped plate 14. A chute is connected along the length direction of the protruding part of the U-shaped plate 14 on the inner wall of the housing. Inclined plates 19 arranged in a staggered manner and provided on the inner wall of the housing are provided between the ventilation holes 18 and the air outlet 5. A pull-out box 20 movably provided at the bottom of the inner wall of the housing is provided below the inclined plates 19. A handle is integrally formed on the pull-out box 20, and a partition is provided between the pull-out box 20 and the carrier 6.

[0031] By providing a cleaning mechanism, the air outlet 5 on the housing can play a certain role in dissipating heat inside the housing, and the staggered inclined plates 19 can play a role in dust blocking. The accumulated dust particles can be taken out and cleaned in time through the movable pull-out box 20, so as to ensure the cleanliness inside the repeater.

[0032] Specifically, both ends of the U-shaped plate 14 and the movable end 22 of the telescopic rod 21 are connected by a swing rod 23. The fixed end 24 of the telescopic rod 21 abuts and fits against the outer wall of the U-shaped plate 14, and a sealing port is formed between the movable end 22 of the telescopic rod 21 and the top of the inner wall of the housing. Both ends of the swing rod 23 are installed on the U-shaped plate 14 and the movable end 22 of the telescopic rod 21 by means of rotational connection. A strip-shaped groove is connected along the height direction of the inner wall of the housing at the movable end 22 of the telescopic rod 21.

[0033] The fixed end 24 on the telescopic rod 21 is movably abutted against the outside of the U-shaped plate 14. Such a connection relationship can ensure the normal movement of the U-shaped plate 14 and also ensure the sealing performance at the connection between the fixed end 24 and the U-shaped plate 14, thus preventing dust particles from entering. At the same time, the strip-shaped groove on the inner wall of the shell can provide a corresponding moving space for the movable end 22 of the telescopic rod 21. The connection between the telescopic rod 21 and the inner wall of the shell is locked and fixed by means of a positioning pin or a bolt assembly, which is convenient for the installation and disassembly of structural parts and is conducive to improving work efficiency.

[0034] Both ends of the push rod 13 are connected with gear plates 25 through brackets. The outer wall of the gear plate 25 is meshed and driven with a rotating gear 26 fixed on a rotating shaft. The center of the rotating shaft penetrates through the protective cover and extends to the blades 27 distributed in a ring. One end of the blade 27 is connected to the rotating shaft by means of plug-in installation. One end of the U-shaped plate 14 is connected to the side plate on the inner wall of the shell through a compression spring 28.

[0035] In addition, during the movement of the push rod 13, the gear plates 25 at the upper and lower ends can be driven to move synchronously to the right. Under the action of gear meshing transmission, the upper gear plate 25 can drive the rotating gear 26 to rotate counterclockwise, and the lower gear plate 25 can drive the rotating gear 26 to rotate clockwise. By the reverse rotation of the rotating gears 26 at both ends, the concentrated heat can be discharged to the diversion groove and finally discharged through the air outlet 5. At this time, both the sealing port and the diversion groove are in an open state, thus facilitating the timely discharge of heat.

[0036] Reference Figure 5 , the amplification and noise reduction circuit includes a first resistor R1 and a second resistor R2 connected to the input signal. Both the first resistor R1 and the second resistor R2 are connected in parallel to the input end of the operational amplifier. A third resistor R3 is connected in series at the output end of the operational amplifier. The third resistor R3 is connected in parallel with a fourth resistor R4 and a fifth resistor R5 connected to the signal output end, and the third resistor R3 is connected in parallel to the collector of the first triode VT1 and the collector of the second triode VT2; When the switch S is disconnected, since there is no voltage at the bases of VT1 and VT2, the two tubes are in a cut-off state, and the internal resistance between their collectors and emitters is very large, having no shunt attenuation or other effects on the signals sent by R1 and R2. At this time, the whole machine circuit is in a normal signal amplification and processing working state.

[0037] The output terminals of the emitters of the first triode VT1 and the second triode VT2 are both grounded for protection. The base of the first triode VT1 is connected in series with the sixth resistor R6, and the base of the second triode VT2 is connected in series with the seventh resistor R7 and is paralleled with the sixth resistor R6. The sixth resistor R6 is paralleled with a capacitor C for grounding protection and an eighth resistor R8 connected in series with the supply voltage VCC. The eighth resistor R8 and the supply voltage VCC are connected through a switch S.

[0038] Specifically, the first triode VT1 and the second triode VT2 are squelch control tubes, and S is a squelch switch. When the switch S is closed, the first triode VT1 and the second triode VT2 are two NPN-type triodes. When the bases of the tubes are at a high potential, the two tubes conduct, and the internal resistance between their collectors and emitters is very small. The conducting first triode VT1 diverts the noise sent by R1 to the ground, and the conducting second triode VT2 diverts the noise sent by R2 to the ground. In this way, the noise added to the subsequent amplifier circuit through R3 and R4 is very small, and the circuit is in a squelch working state.

[0039] R6 and R7 are the base current limiting protection resistors of the two triodes. The capacitor C can eliminate the noise generated when the switch S operates. The principle is as follows: If there is no capacitor C, at the moment when S1 is closed, since the first triode VT1 and the second triode VT2 suddenly change from cutoff to conduction, noise will be generated in the circuit. Similarly, when VT1 and VT2 change from conduction to cutoff, noise will also be generated. After connecting the capacitor C, when the switch is closed, since the voltage across the capacitor C cannot change suddenly, as the capacitor C charges through the resistor R8, the voltage on the capacitor C gradually increases. In this way, VT1 and VT2 enter conduction more slowly from cutoff, which can eliminate the above-mentioned noise. Similarly, when the switch S is disconnected, the charge in the capacitor C discharges through R6, R7 and the emitter junctions of the two tubes, making the two tubes gradually change from conduction to cutoff, which can eliminate the noise of the switch S.

[0040] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

[0041] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to only the specific implementation manners. Obviously, according to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present invention, so that those skilled in the art in the relevant technical field can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A relay device for wireless communication, characterized in that, Comprising: A signal receiver (1) for receiving an analog signal or a digital signal transmitted through a transmission medium; An A / D converter (2) that converts the analog signal in the signal receiver (1) into a digital signal and transmits it to a signal amplifier (3); A signal amplifier (3) that performs amplification and noise reduction processing on the digital signal through an amplification and noise reduction circuit; A transmission module (4) that transmits the digital signal processed by the signal amplifier (3) to the next repeater to achieve continuous signal transmission.

2. The relay device for wireless communication according to claim 1, characterized in that, The repeater includes a housing with an air vent (5) provided therein. Inside the housing wall, a carrier platform (6) connected to the signal receiver (1), the A / D converter (2), and the signal amplifier (3) is installed. Above the carrier platform (6), a baffle (7) integrally formed on the top of the housing wall is provided. A bimetallic strip (8) is detachably installed on the baffle (7). The bimetallic strip (8) includes an active layer (9) and a passive layer (10). An air ventilation shielding mechanism (11) is provided outside the passive layer (10) inside the housing.

3. The relay device for wireless communication according to claim 2, characterized in that, The air ventilation shielding mechanism (11) includes a guiding ring (12) fixed to the top of the housing wall. A push rod (13) is movably connected to the inner wall of the guiding ring (12). One end of the push rod (13) abuts and fits against the passive layer (10), and the other end extends to the outer wall of a U-shaped plate (14). At both ends of the outer wall of the U-shaped plate (14), first inclined surfaces (15) are provided at the corners. Outside the first inclined surfaces (15), fixed blocks (16) are provided on the housing wall. At both ends of the fixed blocks (16), second inclined surfaces (17) adapted to the first inclined surfaces (15) are provided.

4. A relay device for wireless communication according to claim 3, characterized in that, Ventilation holes (18) extending to the air vent (5) are provided at both ends of the outer wall of the U-shaped plate (14). And a sliding groove is connected along the length direction of the protruding part of the U-shaped plate (14) on the housing wall. Between the ventilation holes (18) and the air vent (5), inclined plates (19) are provided on the housing wall in an alternating distribution. Below the inclined plates (19), a pull-out box (20) movably installed on the bottom of the housing wall is provided. A handle is integrally formed on the pull-out box (20). And a partition is provided between the pull-out box (20) and the carrier platform (6).

5. A relay device for wireless communication according to claim 4, characterized in that, Both ends of the U-shaped plate (14) are connected to the movable end (22) of a telescopic rod (21) through a swing rod (23). The fixed end (24) on the telescopic rod (21) abuts and fits against the outer wall of the U-shaped plate (14). And a sealing port is formed between the movable end (22) on the telescopic rod (21) and the top of the housing wall.

6. The relay device for wireless communication according to claim 5, characterized in that, Both ends of the swing rod (23) are installed on the U-shaped plate (14) and the movable end (22) of the telescopic rod (21) by means of rotational connection. A strip-shaped groove is connected along the height direction of the housing wall at the movable end (22) of the telescopic rod (21).

7. The relay device for wireless communication according to claim 3, characterized in that, Both ends of the push rod (13) are connected with gear plates (25) through brackets. A rotating gear (26) fixed on a rotating shaft meshes and drives the outer wall of the gear plate (25). The center of the rotating shaft penetrates through the protective cover and extends to the blades (27) distributed in a ring. One end of the blade (27) is connected to the rotating shaft by means of plug-in installation. One end of the U-shaped plate (14) is connected to the side plate on the inner wall of the housing through a compression spring (28).

8. A relay device for wireless communication according to claim 1, characterized in that, The amplification and noise reduction circuit includes a first resistor R1 and a second resistor R2 connected to the input signal. The first resistor R1 and the second resistor R2 are both connected in parallel to the input end of the operational amplifier. A third resistor R3 is connected in series at the output end of the operational amplifier. The third resistor R3 is connected in parallel with a fourth resistor R4 and a fifth resistor R5 connected to the signal output end. Moreover, the third resistor R3 is connected in parallel to the collector of the first triode VT1 and the collector of the second triode VT2; The output ends of the emitters of the first triode VT1 and the second triode VT2 are both grounded for protection. The base of the first triode VT1 is connected in series to a sixth resistor R6. The base of the second triode VT2 is connected in series to a seventh resistor R7 and is connected in parallel with the sixth resistor R6. The sixth resistor R6 is connected in parallel with a capacitor C for grounding protection and an eighth resistor R8 connected in series to the supply voltage VCC. The eighth resistor R8 and the supply voltage VCC are connected through a switch S.

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