CN110425387B - Transmission device for transmitting data across power line transformer - Google Patents

Transmission device for transmitting data across power line transformer Download PDF

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Publication number
CN110425387B
CN110425387B CN201910724016.XA CN201910724016A CN110425387B CN 110425387 B CN110425387 B CN 110425387B CN 201910724016 A CN201910724016 A CN 201910724016A CN 110425387 B CN110425387 B CN 110425387B
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fixed
plate
transformer
power line
transmitting data
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CN110425387A (en
Inventor
张伟
谢达
关巍
苗靓
穆永保
宫艳朝
张宾宾
姚孟
贺桂义
伊景田
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Hebei Hyperlink Electronics Technology Co ltd
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Hebei Hyperlink Electronics Technology Co ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
    • F16F15/08Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16MFRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
    • F16M11/02Heads
    • F16M11/04Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16MFRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
    • F16M11/02Heads
    • F16M11/16Details concerning attachment of head-supporting legs, with or without actuation of locking members thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16MFRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M13/00Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles
    • F16M13/02Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles for supporting on, or attaching to, an object, e.g. tree, gate, window-frame, cycle
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B3/00Line transmission systems
    • H04B3/54Systems for transmission via power distribution lines

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

The invention discloses a transmission device for transmitting data across a power line transformer, which comprises a transformer, wherein a mounting plate is fixed on the transformer, a buffer device is arranged on the mounting plate, a bearing plate is arranged on the buffer device, a square tube is fixed on the bearing plate, a positioning device is arranged on the square tube, a rotating shaft is detachably connected in the square tube, a moving plate is abutted to one end of the rotating shaft, a knob is rotatably sleeved on the moving plate, one end of the knob is fixed at one end of the rotating shaft, two clapboards are fixed on one side of the moving plate, the rotating shaft is positioned between the two clapboards, and transmission equipment is fixed on one side of the upper end of the moving plate. The invention can stably support, effectively resist external extrusion, better protect transmission equipment, facilitate installation and disassembly, has stable connection, and can improve the coupling state of the transformer and the transmission equipment, thereby ensuring the stability of information transmission.

Description

Transmission device for transmitting data across power line transformer
Technical Field
The invention relates to the technical field of power transmission, in particular to a transmission device for transmitting data across a power line transformer.
Background
The use of power lines to transmit signals has been widely used. In the past, the data transmission is mostly based on narrow band, the bandwidth of the optimal state is about 100K-300K, the data transmission speed is slow, and the current requirements cannot be met, so that the application of power carrier transmission data is limited to a certain extent. The improvement of power carrier transmission data requires that the bandwidth is 200M and the transmission distance is 200M, but how to transmit the broadband signal to the power line usually adopts the existing technology. Meanwhile, in the prior art, data transmission on the power line is usually within the range of the same transformer, that is, the common transmission devices are all arranged on the primary side or the secondary side of the transformer, and data cannot be transmitted across the transformer in the prior art. This is because the primary and secondary voltages of a conventional power transformer are not equal, whereas in the prior art, the voltage is usually directly coupled to the power line (via a capacitor), which easily causes a high potential to appear in the transmission device, damaging the transmission device, and thus, it is difficult to implement the trans-transformer transmission of data in the prior art.
The invention of patent No. CN101867393B discloses a transmission device for transmitting data across a power line transformer, which uses two transmission units respectively coupled with power lines of a primary side and a secondary side of the transformer and connected through respective network interfaces, so that data can be transmitted across the transformer, and at the same time, since the coupling devices of the two transmission units are not directly connected with the power lines but coupled through magnetic induction, data can be conveniently and safely transmitted between the primary side and the secondary side of the power transformer no matter what voltage is on both sides of the transformer. However, as a result of research, it is unclear how the transmission unit is fixed and protected to ensure its normal use, and therefore, we propose a transmission device for transmitting data across a power line transformer to solve the above problems.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a transmission device for transmitting data across a power line transformer.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a stride transmission device of power line transformer transmission data, includes the transformer, be fixed with the mounting panel on the transformer, be equipped with buffer on the mounting panel, the last loading board that is equipped with of buffer, be fixed with square pipe on the loading board, square pipe is equipped with positioner, the intraductal dismantlement of side is connected with the pivot, the one end of pivot is contradicted and is had the movable plate, it has cup jointed the knob to rotate on the movable plate, the one end at the pivot is fixed to the one end of knob, one side of movable plate is fixed with two baffles, the pivot is located between two baffles, upper end one side of movable plate is fixed with transmission equipment, transmission equipment's lower extreme is contradicted in the.
Preferably, buffer is including fixing the board of placing in the mounting panel upper end, the upper end of placing the board is equipped with the standing groove, bottom in the standing groove is fixed with two telescopic links, and the lower extreme at the loading board is all fixed to the upper end of two telescopic links, bottom both sides in the standing groove are all rotated and are connected with two dwangs, the lower extreme both sides of loading board all are fixed with four fixed plates, and the slide bar has been cup jointed in sliding jointly on two fixed plates with one side, the both ends of slide bar all overlap and are equipped with first spring, and two fixed plates all are located between two first springs, be fixed with the connecting plate on the slide bar, the lower extreme of four connecting plates rotates the upper end of connecting at.
Preferably, one end of the first spring is fixed at one end of the sliding rod, and the other end of the first spring is fixed at one side of the fixing plate.
Preferably, positioner is including fixing the riser in square pipe both sides, the inserted bar has been cup jointed in the slip on the riser, and the one end of two inserted bars is fixed with the diaphragm jointly, the cover is equipped with the third spring on the inserted bar, the relative one side at riser and diaphragm is fixed respectively at the both ends of third spring.
Preferably, the both sides of pivot all are equipped with the shifting chute, all be fixed with the second spring on the one end lateral wall in the shifting chute, the one end of second spring is fixed with the carriage release lever, the both sides of square pipe all are equipped with the second through-hole, and the one end of two carriage release levers runs through two shifting chutes and two second through-holes respectively and extends to the both sides of square pipe, be equipped with first through-hole on the carriage release lever, two first through-holes are located the both sides of square pipe respectively.
Preferably, the opposite sides of the two partition plates are provided with blind holes.
Preferably, a pressing plate is fixed on one side of the moving plate, the upper end of the pressing plate is fixed on the lower end of one of the partition plates, a notch is formed in one side of the upper end of the square tube, and the pressing plate corresponds to the notch.
Preferably, one end of each of the two insertion rods is welded to one side of the transverse plate.
Preferably, the transverse plate is coated with a rubber layer.
Preferably, the other end of the inserted link is arranged in a hemispherical shape.
Compared with the prior art, the invention has the beneficial effects that:
1. through the matching of the buffer device, the transformer, the mounting plate, the bearing plate and other components, the square tube is convenient to drive to lift, so that the buffer can be effectively carried out, the external pressure can be offset, the transmission equipment can be well protected, the transmission equipment is prevented from being damaged due to external extrusion, the normal operation of the transmission equipment is ensured, and the service life is prolonged;
2. through the matching of the positioning device, the rotating shaft, the moving rod and the two through holes, the mounting and the dismounting are convenient, and the fixing can be effectively realized, so that the transmission equipment can be effectively prevented from moving randomly, the stability of the transmission equipment can be well ensured, the coupling state of the transmission equipment and the transformer can be favorably improved, and the stability of information transmission is ensured;
in conclusion, the invention can stably support, effectively resist external extrusion, better protect transmission equipment, facilitate installation and disassembly, has stable connection, and can improve the coupling state of the transmission equipment and the transformer, thereby ensuring the stability of information transmission.
Drawings
Fig. 1 is a front view of a transmission device for transmitting data across a power line transformer according to the present invention;
fig. 2 is an enlarged view of a transmission apparatus for transmitting data across a power line transformer according to the present invention at a point a;
fig. 3 is a schematic structural diagram of a placement board of a transmission device for transmitting data across a power line transformer according to the present invention;
fig. 4 is a schematic diagram of a square tube structure of a transmission device for transmitting data across a power line transformer according to the present invention;
fig. 5 is a schematic structural diagram of a moving plate of a transmission device for transmitting data across a power line transformer according to the present invention;
fig. 6 is a schematic view of a rotating shaft structure of a transmission device for transmitting data across a power line transformer according to the present invention;
in the figure: 1 transformer, 2 shifting grooves, 3 shifting rods, 4 inserted rods, 5 square tubes, 6 bearing plates, 7 first springs, 8 sliding rods, 9 transmission equipment, 10 notches, 11 blind holes, 12 partition plates, 13 rotating shafts, 14 first through holes, 15 second springs, 16 fixing plates, 17 connecting plates, 18 mounting plates, 19 placing plates, 20 rotating rods, 21 placing grooves, 22 telescopic rods, 23 third springs, 24 transverse plates, 25 vertical plates, 26 second through holes, 27 pressing plates, 28 knobs and 29 moving plates.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-6, a transmission device for transmitting data across a power line transformer comprises a transformer 1, wherein a mounting plate 18 is fixed on the transformer 1, a buffer device is arranged on the mounting plate 18, a bearing plate 6 is arranged on the buffer device, and the buffer device can effectively resist external extrusion, so that the stability of the bearing plate 6 can be ensured, and the stability of equipment and components on the bearing plate 6 can be further ensured.
According to the invention, the square tube 5 is fixed on the bearing plate 6, the positioning device is arranged on the square tube 5, the rotating shaft 13 is detachably connected in the square tube 5, and the positioning device can fix the rotating shaft 13, so that the rotating shaft 13 is prevented from rotating and moving randomly, and the connection stability can be ensured.
In the invention, one end of the rotating shaft 13 is abutted against a moving plate 29, a knob 28 is rotatably sleeved on the moving plate 29, one end of the knob 28 is fixed at one end of the rotating shaft 13, and the rotating shaft 13 can be driven to rotate through the knob 28, so that the adjustment is convenient.
In the invention, two partition plates 12 are fixed on one side of the moving plate 29, blind holes 11 are formed in the opposite sides of the two partition plates 12, the blind holes 11 correspond to the moving rod 3, and when the rotating shaft 13 rotates, the moving rod 3 can extrude the second spring 15 to be retracted into the moving groove 2, so that the partition plates 12 and the rotating shaft 13 can be conveniently inserted into the square pipe 5, and the connection and the disassembly are convenient.
In the invention, the rotating shaft 13 is positioned between the two partition plates 12, and the arc-shaped grooves are arranged at the opposite sides of the two partition plates 12, so that the arc-shaped grooves correspond to the rotating shaft 13, and the rotating shaft 13 can be favorably and stably rotated.
In the present invention, a transmission device 9 is fixed on one side of the upper end of the moving plate 29, the transmission device 9 uses an existing transmission unit, the two transmission units are respectively coupled with power lines on the primary side and the secondary side of the transformer 1, and the two transmission units are connected through respective network interfaces, so that data can be transmitted across the transformer 1 and coupled through magnetic induction, and thus data can be conveniently and safely transmitted between the primary side and the secondary side of the power transformer 1 regardless of voltages on both sides of the transformer 1.
In the invention, the lower end of the transmission device 9 is abutted against the upper end of the square tube 5 to keep stable, one side of the movable plate 29 is fixed with the pressing plate 27, the upper end of the pressing plate 27 is fixed at the lower end of one of the partition plates 12, one side of the upper end of the square tube 5 is provided with the notch 10, and the pressing plate 27 corresponds to the notch 10, so that the quick insertion and fixation are convenient, the shaking condition is avoided, the stability of the transmission device 9 is ensured, and the stability of magnetic induction coupling is ensured.
In the invention, the buffer device comprises a placing plate 19 fixed at the upper end of the mounting plate 18, a placing groove 21 is arranged at the upper end of the placing plate 19, two telescopic rods 22 are fixed at the bottom in the placing groove 21, the upper ends of the two telescopic rods 22 are both fixed at the lower end of the bearing plate 6, and the bearing plate 6 can be stably lifted and lowered through the telescopic rods 22, so that random shaking of the bearing plate is avoided.
In the invention, two rotating rods 20 are rotatably connected to two sides of the bottom in a placing groove 21, four fixing plates 16 are fixed to two sides of the lower end of a bearing plate 6, a slide rod 8 is sleeved on the two fixing plates 16 on the same side in a sliding mode, first springs 7 are sleeved at two ends of the slide rod 8, one end of each first spring 7 is fixed to one end of the corresponding slide rod 8, the other end of each first spring 7 is fixed to one side of the corresponding fixing plate 16, the two fixing plates 16 are located between the two first springs 7, a connecting plate 17 is fixed to the slide rod 8, the lower ends of the four connecting plates 17 are respectively rotatably connected to the upper ends of the four rotating rods 20, when the bearing plate 6 is lifted, the fixing plates 16, the slide rods 8 and the connecting plates 17 can be driven to lift, the rotating rods 20 are rotated, the slide rod 8 is moved through the connecting plate 17, thereby improving the stability.
In the invention, the positioning device comprises vertical plates 25 fixed on two sides of a square tube 5, the vertical plates 25 are sleeved with inserting rods 4 in a sliding manner, the other ends of the inserting rods 4 are arranged in a hemispherical shape, one ends of the two inserting rods 4 are jointly fixed with a transverse plate 24, one ends of the two inserting rods 4 are welded on one side of the transverse plate 24, the transverse plate 24 is coated with a rubber layer to facilitate buffering, the inserting rods 4 are sleeved with third springs 23, two ends of each third spring 23 are respectively fixed on the opposite sides of the vertical plate 25 and the transverse plate 24, when the moving rod 3 penetrates through a second through hole 26, the moving rod 3 can abut against the inserting rods 4, one ends of the moving rod 3 and the inserting rods 4 are in a hemispherical shape so as to be capable of extruding and moving, the inserting rods 4 press the third springs 23 through the transverse plate 24 to move the inserting rods 4, when the inserting rods 4 correspond to the first through holes 14, the third springs 23 push the moving rods to reset and insert into the, thereby improving the stability of the rotating shaft 13.
In the invention, the two sides of the rotating shaft 13 are both provided with the moving grooves 2, the side wall of one end in each moving groove 2 is fixed with the second spring 15, one end of each second spring 15 is fixed with the moving rod 3, the two sides of the square tube 5 are both provided with the second through hole 26, one end of each moving rod 3 respectively penetrates through the two moving grooves 2 and the two second through holes 26 and extends to the two sides of the square tube 5, the moving rods 3 are provided with the first through holes 14, the two first through holes 14 are respectively positioned on the two sides of the square tube 5, the rotating shaft 13 can be driven to rotate through the knob 28, the moving rods 3 can move out of the blind holes 11 so as to abut against the partition plates 12 and the inner parts of the square tube 5, when the moving rods 3 correspond to the second through holes 26, the action of the second springs 15 penetrates through the second through holes 26 and abuts against the inserting rods 4, so that the inserting rods 4 can be.
In the invention, when in use, two partition plates 12 are aligned with the square tube 5 and inserted, so that the press plate 27 corresponds to the notch 10, the rotating shaft 13 can be driven to rotate through the knob 28, when the moving rod 3 corresponds to the second through hole 26, the second spring 15 penetrates through the second through hole 26 and moves to one side of the square tube 5, the moving rod 3 extrudes the inserting rod 4, so that the third spring 23 extends, when the inserting rod 4 corresponds to the first through hole 14, the third spring 23 pushes the inserting rod 4 to insert, so that the connection stability can be ensured, when disassembly is required, the transverse plate 24 is pulled, and the knob 28 is rotated again, when the bearing plate 6 is extruded, the bearing plate 6 can rise or fall, the rotating rod 20 rotates, and the connecting plate 17 drives the sliding rod 8 to move, so that the first spring 7 deforms, so that the external force is counteracted, and the telescopic rod 22 can ensure the lifting stability of the bearing plate 6.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (8)

1. A transmission device for transmitting data across a power line transformer, comprising a transformer (1), characterized in that: the transformer is characterized in that a mounting plate (18) is fixed on the transformer (1), a buffering device is arranged on the mounting plate (18), a bearing plate (6) is arranged on the buffering device, a square tube (5) is fixed on the bearing plate (6), a positioning device is arranged on the square tube (5), a rotating shaft (13) is detachably connected in the square tube (5), a moving plate (29) is abutted to one end of the rotating shaft (13), a knob (28) is rotatably sleeved on the moving plate (29), one end of the knob (28) is fixed to one end of the rotating shaft (13), two partition plates (12) are fixed to one side of the moving plate (29), the rotating shaft (13) is located between the two partition plates (12), a transmission device (9) is fixed to one side of the upper end of the moving plate (29), and the lower end of the transmission device (9) is abutted to the upper; the positioning device comprises vertical plates (25) fixed on two sides of a square tube (5), inserting rods (4) are sleeved on the vertical plates (25) in a sliding mode, a transverse plate (24) is fixed to one end of each of the two inserting rods (4) together, a third spring (23) is sleeved on each inserting rod (4), and two ends of each third spring (23) are fixed to the opposite sides of the vertical plate (25) and the transverse plate (24) respectively; the both sides of pivot (13) all are equipped with shifting chute (2), all be fixed with second spring (15) on the one end lateral wall in shifting chute (2), the one end of second spring (15) is fixed with carriage release lever (3), the both sides of square pipe (5) all are equipped with second through-hole (26), and the one end of two carriage release levers (3) runs through two shifting chutes (2) and two second through-holes (26) respectively and extends to the both sides of square pipe (5), be equipped with first through-hole (14) on carriage release lever (3), two first through-holes (14) are located the both sides of square pipe (5) respectively.
2. A transmission apparatus for transmitting data across a power line transformer as claimed in claim 1, wherein: the buffer device comprises a placing plate (19) fixed at the upper end of a mounting plate (18), a placing groove (21) is arranged at the upper end of the placing plate (19), two telescopic rods (22) are fixed at the bottom in the placing groove (21), the upper ends of the two telescopic rods (22) are fixed at the lower end of the bearing plate (6), two rotating rods (20) are rotatably connected with two sides of the bottom in the placing groove (21), four fixed plates (16) are fixed on both sides of the lower end of the bearing plate (6), a slide bar (8) is sleeved on the two fixed plates (16) on the same side in a sliding manner, the two ends of the slide bar (8) are respectively sleeved with a first spring (7), the two fixed plates (16) are respectively positioned between the two first springs (7), the sliding rod (8) is fixedly provided with connecting plates (17), and the lower ends of the four connecting plates (17) are respectively and rotatably connected to the upper ends of the four rotating rods (20).
3. A transmission apparatus for transmitting data across a power line transformer as claimed in claim 2, wherein: one end of the first spring (7) is fixed at one end of the sliding rod (8), and the other end of the first spring (7) is fixed at one side of the fixing plate (16).
4. A transmission apparatus for transmitting data across a power line transformer as claimed in claim 1, wherein: blind holes (11) are arranged on the opposite sides of the two partition plates (12).
5. A transmission apparatus for transmitting data across a power line transformer as claimed in claim 1, wherein: one side of the moving plate (29) is fixed with a pressing plate (27), the upper end of the pressing plate (27) is fixed at the lower end of one of the clapboards (12), one side of the upper end of the square tube (5) is provided with a notch (10), and the pressing plate (27) corresponds to the notch (10).
6. A transmission apparatus for transmitting data across a power line transformer as claimed in claim 1, wherein: one end of each of the two inserting rods (4) is welded on one side of the transverse plate (24).
7. A transmission apparatus for transmitting data across a power line transformer as claimed in claim 1, wherein: the transverse plate (24) is coated with a rubber layer.
8. A transmission apparatus for transmitting data across a power line transformer as claimed in claim 1, wherein: the other end of the inserted bar (4) is arranged in a hemispherical shape.
CN201910724016.XA 2019-08-07 2019-08-07 Transmission device for transmitting data across power line transformer Active CN110425387B (en)

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CN1682004A (en) * 2002-09-18 2005-10-12 权赫宗 Connection member of movable type camp having good detachability
CN106194938A (en) * 2016-08-31 2016-12-07 陈江 A kind of quick coupling and instrument
CN207005543U (en) * 2017-07-17 2018-02-13 何全锋 A kind of elbow mouthpiece for fire-fighting equipment
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CN208153458U (en) * 2018-03-20 2018-11-27 南京兴华建筑设计研究院股份有限公司 Attachment device between 3D printing decoration element and building body
CN209120303U (en) * 2018-11-12 2019-07-16 云南中航星北斗科技有限公司 A kind of video monitoring camera safeguard

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CN110425387A (en) 2019-11-08

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