CN113503525A - Solar energy 5G lamp pole altitude mixture control structure - Google Patents

Solar energy 5G lamp pole altitude mixture control structure Download PDF

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Publication number
CN113503525A
CN113503525A CN202110613290.7A CN202110613290A CN113503525A CN 113503525 A CN113503525 A CN 113503525A CN 202110613290 A CN202110613290 A CN 202110613290A CN 113503525 A CN113503525 A CN 113503525A
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CN
China
Prior art keywords
monitoring
telescopic rod
group
lifting driving
lifting
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Withdrawn
Application number
CN202110613290.7A
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Chinese (zh)
Inventor
彭青珍
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Individual
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Individual
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Priority to CN202110613290.7A priority Critical patent/CN113503525A/en
Publication of CN113503525A publication Critical patent/CN113503525A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V21/00Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F21V21/14Adjustable mountings
    • F21V21/22Adjustable mountings telescopic
    • 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
    • F16M11/20Undercarriages with or without wheels
    • F16M11/2007Undercarriages with or without wheels comprising means allowing pivoting adjustment
    • F16M11/2014Undercarriages with or without wheels comprising means allowing pivoting adjustment around a vertical axis
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V33/00Structural combinations of lighting devices with other articles, not otherwise provided for

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)

Abstract

The invention discloses a solar 5G lamp pole height adjusting structure, which relates to the technical field of municipal facilities and solves the problems that the traditional 5G lamp pole has poor telescopic capability in use, cannot adjust the direction and position of monitoring according to actual requirements in use and cannot perform good monitoring in sudden situations, and comprises an installation base; the lower part of the mounting base is fixedly connected with a group of lifting driving pieces; a group of lifting driving screw rods are rotatably connected inside the mounting base; the top of the monitoring transfer seat is fixedly connected with a group of monitoring driving pieces. The invention realizes larger extension range of the automatic extension lamp pole of the lamp pole, simultaneously improves the coverage range of the G base station, ensures good network transmission capability and has larger adjustment capability, and simultaneously realizes the rotation of the monitoring indexing seat, and the monitoring assembly is driven to rotate by the rotation of the monitoring indexing seat to select the optimal monitoring angle, thereby ensuring the monitoring effect.

Description

Solar energy 5G lamp pole altitude mixture control structure
Technical Field
The invention relates to the technical field of municipal facilities, in particular to a solar 5G lamp post height adjusting structure.
Background
Urban lighting is an important component in municipal construction, and with the development of science and technology, 5G technology has been applied to daily life more and more, and because the single 5G basic station coverage area is less for the reason of 5G frequency, consequently need set up many miniature 5G basic stations, and the illumination lamp pole is often installed with the 5G basic station by the subsidiary features of its wide distribution.
For example, application No.: the invention discloses a CN201910362664.5 multi-functional wisdom lamp pole system based on 5G communication, includes: the master control system is used for controlling a network area formed by the street lamps; the street lamp comprises street lamp main bodies which are distributed in a city to form a street lamp network structure, wherein at least one other street lamp main body exists in a first distance of each street lamp main body; the communication module is positioned on each street lamp main body and used for communication between the street lamp main bodies, communication between a lamp post and a monitoring center and 5G signal coverage; the self-checking monitoring system is connected with the circuit inside the single street lamp and is used for monitoring the real-time state of the circuit; the underground pipe gallery is positioned underground, connects the street lamp main body with the power supply equipment in a wired mode and interacts the information of the street lamp system with the master control console in a wired mode; and the first distance is the radius value of the illumination range of the street lamp. The invention achieves the following beneficial effects: the intelligent lamp pole is provided, and the requirement of urban construction is met.
Also for example, application No.: CN202020381064.1 the utility model discloses a 5G wisdom lamp pole, the on-line screen storage device comprises a base, the top of base is provided with the emergent electric pile that fills, the emergent top of filling electric pile is provided with the lamp pole body, the top fixedly connected with machine case of lamp pole body. The utility model discloses an emergent electric pile that fills, driving motor, transmission, the bull stick, solar panel, wind direction air velocity transducer and video monitoring device's cooperation, through solar panel, turn into light energy electric energy and storage, for the device provides power, driving motor passes through the driving gear simultaneously and drives driven gear rotatory, driven gear passes through the bull stick and drives solar panel rotatory, make solar panel face the sun all the time, improve the light energy utilization ratio, through designing wind direction air velocity transducer, be convenient for detect external wind speed and wind direction, fill electric pile through the design is emergent, be convenient for provide the interim place of charging for people, thereby reach multi-functional effect, the problem of current device function singleness has been solved.
Based on the above, the existing 5G lamp pole has poor telescopic capability in use, cannot effectively adjust the height of the lamp pole according to illumination and network conditions, and is prone to the problems of poor illumination at local positions or poor network conditions; therefore, the existing requirements are not met, and a solar 5G lamp pole height adjusting structure is provided for the requirements.
Disclosure of Invention
The invention aims to provide a solar 5G lamp post height adjusting structure, which solves the problems that the existing 5G lamp post in the background art has poor telescopic capability in use, cannot effectively adjust the height of the lamp post according to illumination and network conditions, and is easy to cause poor local position illumination or poor network.
In order to achieve the purpose, the invention provides the following technical scheme: a solar 5G lamp post height adjusting structure comprises an installation base; the lower part of the mounting base is fixedly connected with a group of lifting driving pieces; a group of lifting driving screw rods are rotatably connected inside the mounting base; the top of the mounting base is connected with a group of two-stage telescopic rods in a sliding manner; the top of the two-stage telescopic rod is connected with a group of top telescopic rods in a sliding manner; the upper part of the top telescopic rod is rotatably connected with a group of monitoring transposition seats; the top of the monitoring transfer seat is fixedly connected with a group of monitoring driving pieces.
Preferably, the second-stage telescopic rod further comprises a second-stage telescopic guide groove, three sets of second-stage telescopic guide grooves are arranged in the circumferential array on the outer side of the second-stage telescopic rod, and the second-stage telescopic rod is connected with the installation base in a sliding mode through the second-stage telescopic guide grooves.
Preferably, the lifting driving part further comprises a lifting driving bevel gear, a group of lifting driving bevel gears is coaxially and fixedly connected to a rotating shaft of the lifting driving part, the lifting driving screw further comprises a lifting driven bevel gear, a group of lifting driven bevel gears is coaxially and fixedly connected to the bottom of the lifting driving screw, and the lifting driving bevel gear and the lifting driven bevel gears are meshed to form a bevel gear transmission mechanism.
Preferably, the lifting driving screw is in threaded transmission connection with the second-stage telescopic rod, and the lifting driving screw and the second-stage telescopic rod jointly form a screw nut transmission pair.
Preferably, the top telescopic rod further comprises a top rod guide groove, a group of top rod guide grooves are formed in the left side and the right side of the top telescopic rod, and the top telescopic rod is connected with the second-stage telescopic rod in a sliding mode through the top rod guide grooves.
Preferably, the second grade telescopic link is still including ejector pin lift gyro wheel, the steel cable is connected in the ejector pin lift, the top left and right sides of second grade telescopic link rotates and is connected with a set of ejector pin lift gyro wheel, the top of ejector pin lift gyro wheel is provided with a set of ejector pin lift and connects the steel cable, one section bottom fixed connection with the top telescopic link in the inboard of ejector pin lift connection steel cable, the one end in the ejector pin lift connection steel cable outside and the top fixed connection of installation base, the second grade telescopic link, ejector pin lift gyro wheel, the steel cable is connected in the ejector pin lift, the installation base, the movable pulley group structure has been formed jointly between the top telescopic link.
Preferably, the monitoring driving part further comprises a monitoring transposition driving gear, a group of monitoring transposition driving gears is coaxially and fixedly connected to a rotating shaft of the monitoring driving part, the jacking telescopic rod further comprises a monitoring transposition fixed gear, a group of monitoring transposition fixed gears is fixedly connected to the upper portion of the jacking telescopic rod, and the monitoring transposition driving gear and the monitoring transposition fixed gears are meshed to form a gear transmission mechanism together.
Preferably, the monitoring transfer seat further comprises a monitoring assembly, and four groups of monitoring assemblies are fixedly connected to the bottom of the monitoring transfer seat.
Compared with the prior art, the invention has the beneficial effects that:
when the length of the lamp post needs to be adjusted, the lifting driving piece drives the lifting driving screw rod to rotate through the bevel gear transmission mechanism formed by the engagement of the lifting driving bevel gear and the lifting driven bevel gear, the lifting driving screw rod drives the secondary telescopic rod to slide up and down through the screw nut transmission pair formed by the lifting driving screw rod and the secondary telescopic rod, when the secondary telescopic rod slides up, the top rod is fixed at one end of the outer side of the lifting connecting steel cable, the top telescopic rod is driven to slide up under the action of the movable pulley block, the lifting speed of the top telescopic rod is twice of the lifting speed of the secondary telescopic rod, and the extension of the top telescopic rod is achieved.
In the monitoring process, the monitoring driving piece is meshed with the monitoring transposition fixed gear through the monitoring transposition driving gear to jointly form a gear transmission mechanism to drive the monitoring transposition seat to rotate, the monitoring without dead corners in the whole range is realized through four groups of monitoring assemblies, and the monitoring assemblies are driven to rotate to select the optimal monitoring angle through the rotation of the monitoring transposition seat in case of emergency, so that the monitoring effect is ensured.
The invention realizes the automatic extension of the lamp post, can adjust the extension length of the lamp post according to the requirement in use, meets different lighting requirements, has larger extension range of the lamp post, simultaneously improves the coverage range of a G base station, ensures good network transmission capability and has larger adjustment capability, simultaneously realizes the rotation of the monitoring indexing seat, realizes the monitoring without dead angles in the whole range through four groups of monitoring components, and selects the optimal monitoring angle through the rotation of the monitoring indexing seat to drive the monitoring component to rotate when an emergency occurs, thereby ensuring the monitoring effect.
Drawings
FIG. 1 is a schematic side view of the present invention;
FIG. 2 is a schematic view of a cross-sectional view of the top telescoping rod drive of the present invention;
FIG. 3 is a schematic side view of the two-stage telescopic shaft of the present invention;
FIG. 4 is a schematic view of the cross-sectional structure of the transmission of the two-stage telescopic rod of the present invention;
FIG. 5 is a schematic side view of the shaft of the two-stage telescopic rod of the present invention;
FIG. 6 is an enlarged view of a portion of FIG. 5;
FIG. 7 is a schematic side view of the monitoring indexing table mounting shaft of the present invention;
FIG. 8 is a schematic side view of the transmission shaft inside the monitoring transposing base according to the present invention;
in the figure: 1. installing a base; 2. a lifting drive member; 201. a lifting drive bevel gear; 3. lifting the driving screw; 301. lifting the driven bevel gear; 4. a secondary telescopic rod; 401. a secondary telescopic guide groove; 402. a mandril lifting roller; 403. the ejector rod is connected with a steel cable in a lifting way; 5. pushing the telescopic rod; 501. monitoring the transposition fixed gear; 502. a mandril guide groove; 6. monitoring the transposition base; 601. a monitoring component; 7. monitoring the drive; 701. an index drive gear is monitored.
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 to 8, an embodiment of the present invention includes: a solar 5G lamp post height adjusting structure comprises an installation base 1; the lower part of the mounting base 1 is fixedly connected with a group of lifting driving pieces 2; a group of lifting driving screw rods 3 are rotatably connected inside the mounting base 1; the top of the mounting base 1 is connected with a group of two-stage telescopic rods 4 in a sliding manner; the top of the second-stage telescopic rod 4 is connected with a group of top telescopic rods 5 in a sliding manner; the upper part of the top telescopic rod 5 is rotationally connected with a group of monitoring transposition seats 6; the top of the monitoring transfer seat 6 is fixedly connected with a group of monitoring driving pieces 7.
Further, second grade telescopic rod 4 is still including the flexible guide way 401 of second grade, and the outside circumference array of second grade telescopic rod 4 is arranged and has been seted up the flexible guide way 401 of three groups of second grades, and second grade telescopic rod 4 passes through the flexible guide way 401 of second grade and installs 1 sliding connection of base, and in use, realizes the direction to second grade telescopic rod 4 through the flexible guide way 401 of second grade.
Further, the lifting driving member 2 further comprises a lifting driving bevel gear 201, a set of lifting driving bevel gear 201 is coaxially and fixedly connected to a rotating shaft of the lifting driving member 2, the lifting driving screw 3 further comprises a lifting driven bevel gear 301, a set of lifting driven bevel gear 301 is coaxially and fixedly connected to the bottom of the lifting driving screw 3, the lifting driving bevel gear 201 and the lifting driven bevel gear 301 are meshed to jointly form a bevel gear transmission mechanism, and in use, the lifting driving member 2 drives the lifting driving screw 3 to rotate through the bevel gear transmission mechanism formed by the meshing of the lifting driving bevel gear 201 and the lifting driven bevel gear 301.
Further, the lifting driving screw 3 is in threaded transmission connection with the secondary telescopic rod 4, the lifting driving screw 3 and the secondary telescopic rod 4 jointly form a screw nut transmission pair, and when the lifting driving screw 3 rotates in use, the lifting driving screw 3 drives the secondary telescopic rod 4 to slide up and down through the screw nut transmission pair formed by the lifting driving screw 3 and the secondary telescopic rod 4 jointly.
Further, the top telescopic rod 5 further comprises a top rod guide groove 502, a group of top rod guide grooves 502 are formed in the left side and the right side of the top telescopic rod 5, the top telescopic rod 5 is connected with the second-stage telescopic rod 4 in a sliding mode through the top rod guide grooves 502, and in use, the top telescopic rod 5 is guided through the top rod guide grooves 502.
Further, the secondary telescopic rod 4 further comprises a top rod lifting roller 402, a top rod lifting connecting steel cable 403, a group of top rod lifting rollers 402 is rotatably connected to the left and right sides of the top of the secondary telescopic rod 4, a group of top rod lifting connecting steel cables 403 is arranged on the top of the top rod lifting roller 402, one section of the inner side of each top rod lifting connecting steel cable 403 is fixedly connected with the bottom of the top telescopic rod 5, one end of the outer side of each top rod lifting connecting steel cable 403 is fixedly connected with the top of the mounting base 1, the secondary telescopic rod 4, the top rod lifting roller 402, the top rod lifting connecting steel cables 403, the mounting base 1 and the top telescopic rod 5 jointly form a movable pulley block structure, when in use, when the secondary telescopic rod 4 slides upwards, as one end of the outer side of each top rod lifting connecting steel cable 403 is fixed, the top telescopic rod 5 is driven to slide upwards under the action of the movable pulley block, and the lifting speed of the top telescopic rod 5 is twice as that of the secondary telescopic rod 4, the telescopic rod 5 is stretched out and drawn back.
Further, the monitoring driving member 7 further comprises a monitoring indexing driving gear 701, a group of monitoring indexing driving gears 701 is coaxially and fixedly connected to a rotating shaft of the monitoring driving member 7, the ejection rod 5 further comprises a monitoring indexing fixed gear 501, a group of monitoring indexing fixed gears 501 is fixedly connected to the upper portion of the ejection rod 5, the monitoring indexing driving gear 701 and the monitoring indexing fixed gear 501 are meshed to form a gear transmission mechanism together, and in use, the monitoring driving member 7 drives the monitoring indexing seat 6 to rotate through the gear transmission mechanism formed by meshing of the monitoring indexing driving gear 701 and the monitoring indexing fixed gear 501 together.
Further, the monitoring transfer seat 6 further comprises a monitoring component 601, four groups of monitoring components 601 are fixedly connected to the bottom of the monitoring transfer seat 6, in use, full-range dead-corner-free monitoring is achieved through the four groups of monitoring components 601, and when an emergency occurs, the monitoring transfer seat 6 rotates to drive the monitoring components 601 to rotate to select an optimal monitoring angle, so that a monitoring effect is guaranteed.
The working principle is as follows: when the lifting device is used, the lifting driving piece 2 drives the lifting driving screw rod 3 to rotate through a bevel gear transmission mechanism formed by the engagement of the lifting driving bevel gear 201 and the lifting driven bevel gear 301, the lifting driving screw rod 3 drives the secondary telescopic rod 4 to slide up and down through a screw nut transmission pair formed by the engagement of the lifting driving screw rod 3 and the secondary telescopic rod 4, when the secondary telescopic rod 4 slides up, as one end of the outer side of the ejector rod lifting connecting steel cable 403 is fixed, the top telescopic rod 5 is driven to slide up under the action of a movable pulley block, and the rising speed of the top telescopic rod 5 is twice of the rising speed of the secondary telescopic rod 4, the stretching of the top telescopic rod 5 is realized; the monitoring driving part 7 is meshed with the monitoring transposition fixing gear 501 to form a gear transmission mechanism together to drive the monitoring transposition base 6 to rotate, the four groups of monitoring assemblies 601 are used for realizing the monitoring without dead corners in the whole range, and the monitoring transposition base 6 is used for driving the monitoring assemblies 601 to rotate to select the optimal monitoring angle in case of emergency, so that the monitoring effect is ensured.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (8)

1. The utility model provides a solar energy 5G lamp pole altitude mixture control structure which characterized in that: comprises a mounting base (1); the lower part of the mounting base (1) is fixedly connected with a group of lifting driving pieces (2); a group of lifting driving screw rods (3) are rotatably connected inside the mounting base (1); the top of the mounting base (1) is connected with a group of two-stage telescopic rods (4) in a sliding manner; the top of the two-stage telescopic rod (4) is connected with a group of top telescopic rods (5) in a sliding manner; the upper part of the top telescopic rod (5) is rotatably connected with a group of monitoring transposition seats (6); the top of the monitoring transfer seat (6) is fixedly connected with a group of monitoring driving pieces (7).
2. The solar 5G lamp post height adjusting structure as claimed in claim 1, wherein: two-stage telescopic rod (4) still including the flexible guide way of second grade (401), the outside circumference array of two-stage telescopic rod (4) is arranged and has been seted up three flexible guide ways of group second grade (401), and two-stage telescopic rod (4) are through flexible guide way of second grade (401) and installation base (1) sliding connection.
3. The solar 5G lamp post height adjusting structure as claimed in claim 1, wherein: the lifting driving piece (2) is characterized by further comprising a lifting driving bevel gear (201), a group of lifting driving bevel gears (201) is coaxially and fixedly connected to the rotating shaft of the lifting driving piece (2), the lifting driving screw rod (3) is further comprising a lifting driven bevel gear (301), a group of lifting driven bevel gears (301) is coaxially and fixedly connected to the bottom of the lifting driving screw rod (3), and the lifting driving bevel gears (201) and the lifting driven bevel gears (301) are meshed to form a bevel gear transmission mechanism.
4. The solar 5G lamp post height adjusting structure as claimed in claim 1, wherein: the lifting driving screw rod (3) is in threaded transmission connection with the secondary telescopic rod (4), and the lifting driving screw rod (3) and the secondary telescopic rod (4) jointly form a screw rod nut transmission pair.
5. The solar 5G lamp post height adjusting structure as claimed in claim 1, wherein: the ejection telescopic rod (5) further comprises ejector rod guide grooves (502), a group of ejector rod guide grooves (502) are formed in the left side and the right side of the ejection telescopic rod (5), and the ejection telescopic rod (5) is connected with the secondary telescopic rod (4) in a sliding mode through the ejector rod guide grooves (502).
6. The solar 5G lamp post height adjusting structure as claimed in claim 1, wherein: second grade telescopic link (4) are still including ejector pin lift gyro wheel (402), steel cable (403) are connected in the ejector pin lift, the top left and right sides of second grade telescopic link (4) rotates and is connected with a set of ejector pin lift gyro wheel (402), the top of ejector pin lift gyro wheel (402) is provided with a set of ejector pin lift and connects steel cable (403), the bottom fixed connection of one section of inboard and top telescopic link (5) of steel cable (403) is connected in the ejector pin lift, the one end in the steel cable (403) outside and the top fixed connection of installation base (1) are connected in the ejector pin lift, second grade telescopic link (4), ejector pin lift gyro wheel (402), steel cable (403) are connected in the ejector pin lift, installation base (1), movable pulley block structure has been formed jointly between top telescopic link (5).
7. The solar 5G lamp post height adjusting structure as claimed in claim 1, wherein: the monitoring driving piece (7) further comprises a monitoring transposition driving gear (701), a group of monitoring transposition driving gears (701) is coaxially and fixedly connected to a rotating shaft of the monitoring driving piece (7), the ejection telescopic rod (5) further comprises a monitoring transposition fixed gear (501), a group of monitoring transposition fixed gears (501) is fixedly connected to the upper portion of the ejection telescopic rod (5), and the monitoring transposition driving gear (701) and the monitoring transposition fixed gear (501) are meshed to form a gear transmission mechanism together.
8. The solar 5G lamp post height adjusting structure as claimed in claim 1, wherein: the monitoring transfer seat (6) further comprises a monitoring component (601), and four groups of monitoring components (601) are fixedly connected to the bottom of the monitoring transfer seat (6).
CN202110613290.7A 2021-06-02 2021-06-02 Solar energy 5G lamp pole altitude mixture control structure Withdrawn CN113503525A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110613290.7A CN113503525A (en) 2021-06-02 2021-06-02 Solar energy 5G lamp pole altitude mixture control structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110613290.7A CN113503525A (en) 2021-06-02 2021-06-02 Solar energy 5G lamp pole altitude mixture control structure

Publications (1)

Publication Number Publication Date
CN113503525A true CN113503525A (en) 2021-10-15

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CN202110613290.7A Withdrawn CN113503525A (en) 2021-06-02 2021-06-02 Solar energy 5G lamp pole altitude mixture control structure

Country Status (1)

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CN (1) CN113503525A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115218090A (en) * 2022-06-14 2022-10-21 安徽超清科技股份有限公司 Comprehensive data acquisition system based on 5G

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115218090A (en) * 2022-06-14 2022-10-21 安徽超清科技股份有限公司 Comprehensive data acquisition system based on 5G

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Application publication date: 20211015