CN211121364U - Cable trench wireless environment monitoring device based on RFID technology - Google Patents
Cable trench wireless environment monitoring device based on RFID technology Download PDFInfo
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- CN211121364U CN211121364U CN202020083526.1U CN202020083526U CN211121364U CN 211121364 U CN211121364 U CN 211121364U CN 202020083526 U CN202020083526 U CN 202020083526U CN 211121364 U CN211121364 U CN 211121364U
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Abstract
The utility model discloses a cable pit wireless environment monitoring devices based on RFID technique, include: a power supply and a main control board; the main control board is provided with: the liquid level sensor is used for detecting the liquid level in the cable trench; the temperature and humidity sensor is used for detecting the temperature and the humidity in the cable trench; a memory for storing data; the RFID module is used for communicating with external RFID reading equipment through an RFID technology and carrying out data interaction; a positioning module; a controller; the signal end of the controller is respectively in communication connection with the signal ends of the liquid level sensor, the temperature and humidity sensor, the water immersion sensor, the memory, the RFID module, the positioning module, the combustible gas sensor, the smoke sensor, the flow meter and the contactor, the detection end of the temperature and humidity sensor is electrically connected with the output end of the temperature and humidity probe through a first lead, and the temperature and humidity probe is fixed outside the shell; the liquid level sensor is electrically connected with the liquid level probe through a second lead, and the liquid level probe is fixed at the bottom of the guide cylinder.
Description
Technical Field
The utility model relates to a cable pit wireless environment monitoring devices, if be applied to the environmental parameter monitoring in cable pit, the cable well, especially relate to a cable pit wireless environment monitoring devices based on RFID technique.
Background
The cable trench is a common cable laying form of a power grid, is used as a special channel for bearing high-voltage transmission cable laying, and is an important infrastructure in power transmission and distribution. The environmental state in the cable trench is closely related to normal transmission of electric power, if the electric trench is easy to accumulate water and has high humidity, the high-voltage transmission cable is soaked in water for a long time or is in an environment with overhigh humidity, the cable head breakage phenomenon is easy to occur, and the safety of a power transmission system is damaged. Meanwhile, the operating temperature of the cable is high, the heat dissipation of the cable can be affected if the temperature in the cable trench is too high, and the risk of spontaneous combustion of the aged high-voltage cable insulating layer exists. The cable trench is stocked with dirt for a long time, combustible gases such as methane and methane are easy to breed, and hidden troubles are brought to the stable operation of the cable. Therefore, it is very necessary to realize real-time monitoring of the environmental state of the cable trench. At present, for monitoring underground environment states, students at home and abroad propose typical schemes mainly including wireless technology monitoring schemes based on ZigBee and the like, monitoring schemes combining ZigBee wireless technology and other communication technologies, and monitoring schemes combining industrial buses and Internet. A plurality of monitoring schemes obtain a certain monitoring effect, but the defects of complex wiring, large engineering quantity, high investment cost and the like still exist in the monitoring of the cable trench environment at present. This is the problem that cable pit environmental monitoring needs to solve now urgently.
The most main problem of cable pit environmental monitoring at present is:
(1) the monitoring cost is high (cable laying or underground wireless communication network construction needs to be carried out on a large scale), the engineering construction cost is high, and the difficulty is high.
(2) The monitoring efficiency is low, and the system reliability is poor (the electromagnetic environment of the cable trench is severe, and the information transmission reliability is difficult to guarantee).
(3) The operation and maintenance amount is large, and the operation cost is high (the operation and maintenance amount of the equipment is large and the operation cost is high due to the severe environment of the cable trench).
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned defect of the prior art, the utility model aims to solve the technical problem that a cable pit wireless environment monitoring device based on RFID technique is provided, its simple structure, simple to operate and can satisfy cable pit environmental monitoring's requirement.
In order to achieve the above object, the utility model provides a cable pit wireless environment monitoring device based on RFID technique, include: a power supply and a main control board; the power supply is used for supplying electric energy; the main control board is provided with:
the liquid level sensor is used for detecting the liquid level in the cable trench;
the temperature and humidity sensor is used for detecting the temperature and the humidity in the cable trench;
a memory for storing data;
the RFID module is used for communicating with external RFID reading equipment through an RFID technology and carrying out data interaction;
the positioning module is used for positioning the shell;
the controller is used for receiving, transmitting and analyzing the control command and calculating parameters;
the signal end of the controller is respectively in communication connection with the signal ends of the liquid level sensor, the temperature and humidity sensor, the water immersion sensor, the memory, the RFID module, the positioning module, the combustible gas sensor, the smoke sensor, the flow meter and the contactor, the detection end of the temperature and humidity sensor is electrically connected with the output end of the temperature and humidity probe through a first lead, and the temperature and humidity probe is fixed outside the shell; the liquid level sensor is electrically connected with the liquid level probe through a second lead, and the liquid level probe is fixed at the bottom of the guide cylinder.
Preferably, the water logging device further comprises a spherical shell, an electric cavity, a water logging cavity, a water isolating cavity and a guide hole are respectively arranged in the shell, the electric cavity and the water logging cavity are divided by a pore plate, countless through holes are formed in the pore plate, and a water logging sensor is installed in the water logging cavity;
the waterproof board is fixed inside the shell, and a winding mechanism is installed in the waterproof cavity and used for winding a second lead and ensuring the communication connection of the second lead and the liquid level sensor;
the guide hole is sleeved outside the guide cylinder, the shell can slide up and down along the axial direction of the guide cylinder, the interior of the shell is in a sealed state, and the shell can float on the water surface; and the waterproof plate and the pore plate are respectively provided with a power supply and a main control plate.
Preferably, the electric cavity is further provided with an air pump, an inlet of the air pump is communicated with one end of the air inlet pipe, and the other end of the air inlet pipe penetrates out of the shell; an air outlet of the air pump is communicated with an inlet of the flow meter, an outlet of the flow meter is communicated with an air inlet of the smoke sensor, an air outlet of the smoke sensor is communicated with an air inlet of the combustible gas sensor, an air outlet of the combustible gas sensor is communicated with one end of the exhaust pipe, and the other end of the exhaust pipe penetrates through the shell and then is communicated with the atmosphere; the electric connection end of the air pump is in conductive connection with the movable contact of the contactor, and the static contact of the contactor is in conductive connection with the output electrode of the power supply.
Preferably, a check valve is connected in series on the exhaust pipe, and the opening direction of the check valve is the exhaust direction from the combustible gas sensor to the exhaust pipe.
Preferably, the end of the exhaust pipe and the end of the air inlet pipe, which extend out of the shell, are provided with a backflow prevention mechanism, the backflow prevention mechanism comprises a straight pipe with a downward opening, the straight pipe is communicated with the interior of the exhaust pipe or the air inlet pipe, the interior of the straight pipe is a hollow straight pipe inner pipe, the straight pipe inner pipe is sequentially provided with a water stop plug, a water stop shaft and a hole ring from top to bottom, and the inner side of the water stop plug is provided with a water stop;
the hole ring is provided with a plurality of through holes, the water stopping shaft is respectively provided with a diversion trench, a water stopping conical head and a limiting bulge, a first pressure spring is sleeved on a part of the water stopping shaft between the limiting bulge and the hole ring, the hole ring is fixed in the inner pipe of the straight pipe, the bottom of the water stopping shaft penetrates through the straight pipe and then is assembled and fixed with the floating body, and the floating body can float on the water surface; the water-stopping conical head can be assembled with the water-stopping conical hole in a sealing mode to seal the water-stopping plug.
Preferably, the winding mechanism comprises a winding shaft and a clockwork spring, the clockwork spring is provided with two parts which are respectively arranged at two ends of the winding shaft, one end of the inner side of a steel belt of the clockwork spring is fixedly assembled with the winding shaft, the outer end of the steel belt of the clockwork spring is fixedly assembled with a shell of the clockwork spring, the shell of the clockwork spring is fixedly arranged on the waterproof plate, winding rings are respectively fixedly arranged on two sides of the winding shaft close to the two clockwork springs, a connecting cable is fixedly arranged in the winding shaft, one end of a second lead is electrically and communicatively connected with one end of the connecting;
the other end of the connecting cable penetrates out of the winding shaft and then is in conductive connection with a stator of the electric slip ring, a rotor of the electric slip ring penetrates through the waterproof plate through a fourth lead and then is electrically connected with the access end and the power supply end of the liquid level sensor, and the connecting cable is coaxial with the winding shaft.
Preferably, the electrical slip ring is installed in the inner waterproof cover, the inner waterproof cover is arranged in the waterproof cover, the waterproof cover is installed on the waterproof board, and the inner waterproof cover is in a sealed state.
Preferably, the read-write signal end of the RFID module is in communication connection with an RFID chip in a reader through a third wire, and the reader is fixed to the top of the guide cylinder.
The utility model has the advantages that: the utility model discloses simple structure, manufacturing cost is on the low side, and simple to operate need not complicated communication wiring, design moreover to greatly reduced installation cost and later maintenance cost, can also satisfy the requirement to cable pit environmental monitoring simultaneously.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an enlarged view at a in fig. 1.
Fig. 3 is a schematic structural view of the winding mechanism of the present invention.
Fig. 4 is an electrical block diagram of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Referring to fig. 1-4, a cable trench wireless environment monitoring device based on RFID technology includes a spherical housing 110, an electrical cavity 111, a water measuring cavity 112, a water blocking cavity 113, and a guiding hole 114 are respectively disposed inside the housing 110, the electric cavity 111 and the water measuring cavity 112 are divided by a pore plate 120, countless through holes are arranged on the pore plate 120, once water enters the electric cavity, water can flow into water measuring cavity 112, installs water sensor 221 in water measuring cavity 112, and water sensor is used for surveying whether there is water in water measuring cavity 112, in case there is water then to all consumer outage (controller control power supply disconnection to all power supply unit power supply can, it has the relay to establish ties on the output electrode of power in this embodiment, the control end of relay and the signal end communication of controller are connected to through the external electric current break-make of relay control power).
The waterproof board 130 is used for sealing and dividing the water-proof cavity 113 and the electric cavity 111, the waterproof board is fixed inside the shell 110, the winding mechanism 300 is installed in the water-proof cavity 113, the winding mechanism 300 is used for winding a second lead 252 and ensures that the second lead 252 is in communication connection with the liquid level sensor, and the second lead 252 is also in electrical connection with the signal end of the liquid level probe 212, so that the liquid level sensor is in conductive and communication connection with the liquid level probe;
the guide hole 114 is sleeved outside the guide cylinder 140, and the housing 110 can slide up and down along the axial direction of the guide cylinder 140, the inside of the housing is in a sealed state, and the housing can float on the water surface. The design enables the shell to float once the cable trench is flooded by water, so that water entering of the electric cavity caused by water flooding is avoided.
The waterproof board 130 and the orifice plate 120 are respectively provided with a power supply 223 and a main control board 222, the power supply 223 is used for providing electric energy, and the power supply in this embodiment may be a battery or an AC-DC converter; the main control board 222 is provided with:
the liquid level sensor is used for detecting the liquid level in the cable trench;
the temperature and humidity sensor is used for detecting the temperature and the humidity in the cable trench;
a memory for storing data; the memory of the embodiment adopts a flash memory card;
the RFID module is used for communicating with external RFID reading equipment through an RFID technology and carrying out data interaction;
the positioning module is used for positioning the shell, and the positioning module of the embodiment adopts a GPS module or a Beidou positioning module;
the protection circuit is used for controlling the power supply of the power supply to the controller and preventing overlarge current or voltage, overheating and the like;
and the controller is used for receiving, transmitting and analyzing the control command and calculating the parameters. The controller of this embodiment selects the MCU with low power consumption standby and auto-wake-up functions.
The signal end of controller is connected with the signal end communication of level sensor, temperature and humidity sensor, water logging sensor, memory, RFID module, orientation module, combustible gas sensor, smoke transducer, flowmeter, contactor respectively, temperature and humidity sensor's detection end is connected with temperature and humidity probe 211's output electricity through first wire 251, and temperature and humidity probe 211 is fixed outside shell 110 to through temperature and humidity probe detection cable ditch internal temperature, humidity.
The electric cavity 111 is also provided with an air pump 400, an inlet of the air pump 400 is communicated with one end of an air inlet pipe 510, and the other end of the air inlet pipe 510 penetrates out of the shell 110, so that air outside the shell can be introduced into the air pump 400; an air outlet of the air pump 400 is communicated with an inlet of the flow meter, an outlet of the flow meter is communicated with an air inlet of the smoke sensor, an air outlet of the smoke sensor is communicated with an air inlet of the combustible gas sensor, an air outlet of the combustible gas sensor is communicated with one end of the exhaust pipe 610, the other end of the exhaust pipe 610 penetrates out of the shell 110 and then is communicated with the atmosphere, the exhaust pipe 610 is connected with a one-way valve 230 in series, and the opening direction of the one-way valve is the exhaust direction from the combustible gas sensor;
the power connection end of the air pump 400 is in conductive connection with the movable contact of the contactor, and the static contact of the contactor is in conductive connection with the power connection end of the protection circuit, so that the start and stop of the air pump 400 are controlled by controlling the on and off of the contactor through the controller. When in use, the air pump 400 is periodically started, so that the air flow is pumped to the flow meter, the flow meter calculates the air flow and the flow rate, and then the signals are fed back to the controller; the gas sequentially enters the smoke sensor and the combustible gas sensor, so that the concentrations of the smoke and the combustible gas are respectively detected, and signals are input into the controller to be processed and then stored in the memory;
the liquid level sensor and the temperature and humidity sensor are synchronously and periodically started, so that detected temperature and humidity and liquid level information are input into the controller to be processed and then stored in the memory, and the controller is mainly used for processing data and storing preset classification and coding modes so as to be convenient for later-stage checking. And (3) manually and periodically inspecting each cable trench, establishing RFID communication with the RFID module through the RFID reader-writer so as to read data in the memory, and manually carrying the RFID reader-writer and inputting the read data into the server. This approach eliminates the need for complex communication arrangements and periodic routing of the cable trench is inherently necessary, thereby greatly reducing costs.
Preferably, in order to prevent water in the cable trench from flowing backward into the interior of the housing from the air inlet pipe, the applicant is respectively provided with a backflow prevention mechanism 500 at one end of the air outlet pipe 610 and the air inlet pipe 510 extending out of the housing, the backflow prevention mechanism comprises a straight pipe 520 with a downward opening, the straight pipe 520 is communicated with the interior of the air outlet pipe 610 or the air inlet pipe 510, the interior of the straight pipe 520 is a hollow straight pipe inner pipe 521, the straight pipe inner pipe 521 is sequentially provided with a water stop plug 530, a water stop shaft 540 and a hole ring 522 from top to bottom, and the inner side of the water stop;
the hole ring 522 is provided with countless through holes, the water stopping shaft 540 is provided with a diversion trench 542, a water stopping conical head 541 and a limiting protrusion 543, the part of the water stopping shaft 540 between the limiting protrusion 543 and the hole ring 522 is sleeved with a first pressure spring 550, the hole ring 522 is fixed in the straight pipe inner pipe 521, the bottom of the water stopping shaft 540 penetrates out of the straight pipe 520 and then is assembled and fixed with a floating body 560, and the floating body is made of a light material and can float on the water surface. The water stop cone 541 can be sealingly assembled with the water stop cone hole 531 to seal the water stop plug 530.
In an initial state, due to the gravity of the floating body, the water stop shaft 540 moves downward against the elastic force of the first pressure spring 550, so that the water stop conical head 541 is separated from the water stop conical hole 531, and at this time, the air flow passes through a gap between the water stop conical head 541 and the water stop conical hole 531. Once the water level reaches the floating body 560, the floating body continuously floats upwards to drive the water-stopping shaft to move upwards until the water-stopping conical head 541 and the water-stopping conical hole 531 are hermetically assembled, and at the moment, water cannot pass through the water-stopping plug, so that sealing and water proofing are realized.
Referring to fig. 3, the winding mechanism 300 includes a winding shaft 320 and a spring 310, the spring 310 has two ends respectively mounted on the two ends of the winding shaft 320, one end of the inner side of a steel strip of the spring 310 is fixedly assembled with the winding shaft 320, the outer end of the steel strip is fixedly assembled with the outer shell of the spring, the outer shell of the spring is fixedly mounted on the waterproof board 140, winding rings 321 are respectively fixed on the two sides of the winding shaft 320 close to the two springs 310, a connecting cable 350 is fixed in the winding shaft 320, one end of the second conducting wire 252 is electrically and communicatively connected with one end of the connecting cable, and the second conducting wire 252 is wound on the winding shaft 310;
the other end of the connecting cable 350 penetrates through the winding shaft 310 and then is electrically connected with the stator of the electric slip ring 340, the rotor of the electric slip ring 340 penetrates through the waterproof plate through a fourth conducting wire and then is electrically connected with the power supply end and the access end of the liquid level sensor, and the connecting cable 350 is coaxial with the winding shaft 310. The electric slip ring is arranged in the waterproof inner cover 331, the waterproof inner cover 331 is arranged in the waterproof cover 330, the waterproof cover 330 is hermetically arranged on the waterproof plate, and the waterproof inner cover is in a sealed state. The liquid level probe 212 is fixed at the bottom of the guide cylinder 140.
During the use, along with the shell rises, the liquid level probe can carry out the tractive to the second wire for second wire drive spool constantly rotates in order to release second wire 252, because the effect of electric slip ring can not influence the electricity between connecting cable and the level sensor and be connected, and whole process clockwork spring constantly tightens up storage elasticity moreover, in case the shell descends to eyed clockwork spring drive spool and rotates the wire winding, thereby avoids the second wire overlength to lead to winding, breaking.
Preferably, the read-write signal terminal of the RFID module is connected to the RFID chip in the reader 240 through a third wire 253, so as to directly read the signal of the RFID module at the reader. The reader 240 is fixed to the top of the guide cylinder 140.
The details of the present invention are well known to those skilled in the art.
The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.
Claims (8)
1. The utility model provides a cable pit wireless environment monitoring devices based on RFID technique which characterized in that includes: a power supply and a main control board; the power supply is used for supplying electric energy; the main control board is provided with:
the liquid level sensor is used for detecting the liquid level in the cable trench;
the temperature and humidity sensor is used for detecting the temperature and the humidity in the cable trench;
a memory for storing data;
the RFID module is used for communicating with external RFID reading equipment through an RFID technology and carrying out data interaction;
the positioning module is used for positioning the shell;
the controller is used for receiving, transmitting and analyzing the control command and calculating parameters;
the signal end of the controller is respectively in communication connection with the signal ends of the liquid level sensor, the temperature and humidity sensor, the water immersion sensor, the memory, the RFID module, the positioning module, the combustible gas sensor, the smoke sensor, the flow meter and the contactor, the detection end of the temperature and humidity sensor is electrically connected with the output end of the temperature and humidity probe through a first lead, and the temperature and humidity probe is fixed outside the shell; the liquid level sensor is electrically connected with the liquid level probe through a second lead, and the liquid level probe is fixed at the bottom of the guide cylinder.
2. The cable trench wireless environment monitoring device according to claim 1, further comprising a spherical housing, wherein an electrical cavity, a water measuring cavity, a water isolating cavity and a guide hole are respectively arranged inside the housing, the electrical cavity and the water measuring cavity are divided by a hole plate, the hole plate is provided with countless through holes, and a water sensor is arranged in the water measuring cavity;
the waterproof board is fixed inside the shell, and a winding mechanism is installed in the waterproof cavity and used for winding a second lead and ensuring the communication connection of the second lead and the liquid level sensor;
the guide hole is sleeved outside the guide cylinder, the shell can slide up and down along the axial direction of the guide cylinder, the interior of the shell is in a sealed state, and the shell can float on the water surface; and the waterproof plate and the pore plate are respectively provided with a power supply and a main control plate.
3. The cable trench wireless environment monitoring device of claim 2, wherein the electrical cavity is further provided with an air pump, an inlet of the air pump is communicated with one end of an air inlet pipe, and the other end of the air inlet pipe penetrates out of the shell; an air outlet of the air pump is communicated with an inlet of the flow meter, an outlet of the flow meter is communicated with an air inlet of the smoke sensor, an air outlet of the smoke sensor is communicated with an air inlet of the combustible gas sensor, an air outlet of the combustible gas sensor is communicated with one end of the exhaust pipe, and the other end of the exhaust pipe penetrates through the shell and then is communicated with the atmosphere; the electric connection end of the air pump is in conductive connection with the movable contact of the contactor, and the static contact of the contactor is in conductive connection with the output electrode of the power supply.
4. The cable pit wireless environment monitoring device of claim 3, wherein a check valve is connected in series to the exhaust pipe, and the opening direction of the check valve is from the combustible gas sensor to the exhaust direction of the exhaust pipe.
5. The cable trench wireless environment monitoring device according to claim 3 or 4, wherein a backflow preventing mechanism is arranged at one end of the exhaust pipe and the air inlet pipe extending out of the housing, the backflow preventing mechanism comprises a straight pipe with a downward opening, the straight pipe is communicated with the interior of the exhaust pipe or the air inlet pipe, a hollow straight pipe inner pipe is arranged in the straight pipe, a water stop plug, a water stop shaft and a hole ring are sequentially arranged in the straight pipe inner pipe from top to bottom, and a water stop taper hole is arranged at the inner side of the water stop plug;
the hole ring is provided with a plurality of through holes, the water stopping shaft is respectively provided with a diversion trench, a water stopping conical head and a limiting bulge, a first pressure spring is sleeved on a part of the water stopping shaft between the limiting bulge and the hole ring, the hole ring is fixed in the inner pipe of the straight pipe, the bottom of the water stopping shaft penetrates through the straight pipe and then is assembled and fixed with the floating body, and the floating body can float on the water surface; the water-stopping conical head can be assembled with the water-stopping conical hole in a sealing mode to seal the water-stopping plug.
6. The cable trench wireless environment monitoring device according to claim 2, wherein the winding mechanism comprises a winding reel and a spring, the two spring are respectively installed at two ends of the winding reel, one end of the inner side of a steel strip of the spring is fixedly assembled with the winding reel, the outer end of the steel strip of the spring is fixedly assembled with a housing of the spring, the housing of the spring is fixed on the waterproof plate, winding rings are respectively fixed on two sides of the winding reel close to the two springs, a connecting cable is fixed in the winding reel, one end of the second wire is electrically and communicatively connected with one end of the connecting cable, and the second wire is wound on the winding reel;
the other end of the connecting cable penetrates out of the winding shaft and then is in conductive connection with a stator of the electric slip ring, a rotor of the electric slip ring penetrates through the waterproof plate through a fourth lead and then is electrically connected with the access end and the power supply end of the liquid level sensor, and the connecting cable is coaxial with the winding shaft.
7. The cable trench wireless environment monitoring device of claim 6, wherein the electrical slip ring is mounted in an inner waterproof cover disposed in a waterproof cover mounted on the waterproof plate, the inner waterproof cover being in a sealed state.
8. The cable trench wireless environment monitoring device of claim 2, wherein the read-write signal terminal of the RFID module is in communication connection with an RFID chip in a reader through a third wire, and the reader is fixed on the top of the guide cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020083526.1U CN211121364U (en) | 2020-01-15 | 2020-01-15 | Cable trench wireless environment monitoring device based on RFID technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020083526.1U CN211121364U (en) | 2020-01-15 | 2020-01-15 | Cable trench wireless environment monitoring device based on RFID technology |
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| CN211121364U true CN211121364U (en) | 2020-07-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112325924A (en) * | 2020-09-09 | 2021-02-05 | 国网江苏省电力有限公司盐城供电分公司 | A alarm device for cable pit |
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2020
- 2020-01-15 CN CN202020083526.1U patent/CN211121364U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112325924A (en) * | 2020-09-09 | 2021-02-05 | 国网江苏省电力有限公司盐城供电分公司 | A alarm device for cable pit |
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