CN113075582A - Electric leakage detection device of energy storage system - Google Patents
Electric leakage detection device of energy storage system Download PDFInfo
- Publication number
- CN113075582A CN113075582A CN202110350099.8A CN202110350099A CN113075582A CN 113075582 A CN113075582 A CN 113075582A CN 202110350099 A CN202110350099 A CN 202110350099A CN 113075582 A CN113075582 A CN 113075582A
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- push rod
- energy storage
- storage system
- electrically connected
- mounting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
Abstract
The invention discloses a leakage detection device of an energy storage system, which comprises: a housing having a through hole formed therethrough; the rotatable probe is arranged in the shell and is opposite to the through hole; the push rod mechanism is embedded in the shell and is in transmission connection with the rotatable probe so as to drive the rotatable probe to pass through the through hole and extend out of the shell; the push rod mechanism is electrically connected with the rotatable probe; the universal meter is arranged on the rod wall of the push rod mechanism; the universal meter is electrically connected with the push rod mechanism; the data processing control unit is arranged in the shell and is electrically connected with the universal meter; and the wireless transmission unit is arranged in the shell and is electrically connected with the data processing unit. Therefore, the storage batteries at different positions in the energy storage system can be automatically detected and sent to the remote client through the wireless transmission unit, and the remote client can determine whether the energy storage system has an electric leakage phenomenon according to the detection value, so that the detection efficiency is improved.
Description
Technical Field
The present invention relates to the field of electrical leakage detection technologies, and in particular, to an electrical leakage detection apparatus for an energy storage system.
Background
An energy storage system (a distributed energy storage system or a battery storage system) adopted by commercial power is formed by one or more batteries in a hybrid connection mode, and then the batteries are fixedly placed through placing devices such as a cabinet body, a box body or a battery rack.
Although the energy storage system after being fixedly placed is excluded from being connected with external electrical appliances, the external output terminals of the storage batteries of each unit, the interiors of the storage batteries, and the shells of the storage batteries are electrically insulated from the placing device. However, when a certain battery in the energy storage system fails, especially when the battery has a leakage failure, the internal or external output terminal of the failed battery is electrically connected with the placing device through the leakage, so that the failed battery and the placing device, even the battery connected in series with the battery, form an abnormal loop. The existence of the abnormal loop can provide a discharge loop between the energy storage system and the placing device, thereby creating conditions for the branch discharge of the storage battery and further causing the damage to the energy storage system.
Obviously, whether the energy storage system leaks electricity is an important index for representing whether the energy storage system is damaged, and in the prior art, generally, technicians perform electric leakage detection on the energy storage system periodically to determine whether the energy storage system is intact. The method is particularly suitable for remote areas and has the problems of untimely detection, high detection cost, low detection efficiency and the like. Therefore, the device capable of autonomously detecting the leakage of the energy storage system is provided, and has great significance.
Disclosure of Invention
The invention provides an electric leakage detection device of an energy storage system, which is characterized in that an electric leakage test is carried out on a storage battery in the energy storage system through a measuring probe, and a detection result is sent to a remote client through a detection body, so that the autonomous detection of the energy storage system is realized, and the detection efficiency is improved.
The invention provides a leakage detection device of an energy storage system, which comprises:
a housing having a through hole formed therethrough;
the rotatable probe is arranged in the shell and is opposite to the through hole;
the push rod mechanism is embedded in the shell and is in transmission connection with the rotatable probe so as to drive the rotatable probe to pass through the through hole and extend out of the shell; the push rod mechanism is electrically connected with the rotatable probe;
the universal meter is arranged on the rod wall of the push rod mechanism; the universal meter is electrically connected with the push rod mechanism;
the data processing control unit is arranged in the shell and is electrically connected with the universal meter;
and the wireless transmission unit is arranged in the shell and is electrically connected with the data processing unit.
Optionally, the rotatable probe comprises:
the mounting rod is embedded in the push rod mechanism;
the second measuring head is arranged in the inner cavity of the mounting rod and is electrically connected with the data processing control unit;
the first measuring head is exposed in the inner cavity of the mounting rod and is electrically connected with the data processing control unit.
Optionally, the push rod mechanism comprises:
the mounting rod is embedded in the rod top of the electric push rod through the mounting hole;
the mounting cylinder is provided with a mounting groove; the universal meter is arranged on the wall of the installation cylinder; the electric push rod is connected with the top of the mounting cylinder through the mounting groove.
Optionally, a movable plate groove structure is arranged at a rod top of the electric push rod, and the movable plate groove structure includes:
the mounting seat is arranged on the electric push rod; a movable groove is formed in the mounting seat, and an LED lamp and a miniature camera are respectively arranged on two sides of the mounting seat;
the mounting plate is arranged in the movable groove and is provided with the mounting hole;
and the motor penetrates through the mounting hole through an output shaft of the motor and is fixedly connected with the mounting plate.
Optionally, the motor is a micro stepper motor.
Optionally, the data processing control unit includes:
the data reading unit is electrically connected with the universal meter;
and the control unit is electrically connected with the motor, the electric push rod, the data reading unit and the wireless transmission unit respectively.
Optionally, the control unit comprises:
a control circuit for controlling the opening and closing of the wireless transmission unit; the micro stepping motor is used for driving the electric push rod and the micro stepping motor; the control circuit is respectively and electrically connected with the micro stepping motor, the electric push rod, the data reading unit and the wireless transmission unit;
and the clock circuit is electrically connected with the control circuit and is used for triggering the control circuit.
Optionally, the control circuit is one of a single chip microcomputer, an ARM processor and a PLC.
Optionally, the data reading unit includes:
the data reading circuit is used for reading data in the multimeter;
and the storage circuit is electrically connected with the data reading circuit and is used for storing the data read in the data reading circuit.
Optionally, the wireless transmission unit is a wireless communication module.
The leakage detection device of the energy storage system comprises the telescopic measuring probe, the detection body and the shell, can automatically detect storage batteries at different positions in the energy storage system, arranges detection data through the data processing control unit in the detection body, and sends the detection data to the remote client through the wireless transmission unit, and the remote client can determine whether the leakage phenomenon exists in the energy storage system according to the detection value. The energy storage system can be automatically detected, and the detection efficiency is improved.
Meanwhile, the shell provided by the technical scheme of the invention is provided with the through hole, so that a sufficient space is reserved for the expansion and the rotation of the telescopic measuring probe, and the hidden position in the energy storage system can be detected as far as possible.
Drawings
Fig. 1 is an external view of an electrical leakage detection apparatus of an energy storage system according to the present invention;
fig. 2 is a schematic structural diagram of an electrical leakage detection apparatus of an energy storage system according to the present invention;
fig. 3 is a schematic structural diagram of a telescopic measurement probe of the leakage detection device of the energy storage system according to the present invention;
fig. 4 is a partially enlarged view of a portion I of a schematic structural diagram of a retractable measurement probe of an electrical leakage detection apparatus of an energy storage system according to the present invention.
Reference numerals:
1-telescopic measuring probe, 11-electric push rod, 12-motor, 13-multimeter, 14-mounting seat, 15-LED lamp, 16-miniature camera, 17-mounting rod, 18-first measuring head, 19-mounting cylinder, 2-shell, 3-detection body, 31-data reading circuit, 32-control circuit, 33-wireless transmission unit, 34-clock circuit and 35-storage circuit.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The embodiment of the invention provides an electric leakage detection device of an energy storage system, which is characterized in that an electric leakage test is carried out on a storage battery in the energy storage system through a telescopic measuring probe, and a detection result is sent to a remote client through a detection body, so that the autonomous detection of the energy storage system is realized, and the detection efficiency is improved.
Referring to fig. 1 to 4, fig. 1 is an external view of an electrical leakage detection device of an energy storage system of the present invention, fig. 2 is a schematic structural diagram of the electrical leakage detection device of the energy storage system of the present invention, fig. 3 is a schematic structural diagram of a telescopic measurement probe of the electrical leakage detection device of the energy storage system of the present invention, and fig. 4 is a partial enlarged view of a part I of the schematic structural diagram of the telescopic measurement probe of the electrical leakage detection device of the energy storage system of the present invention. The invention relates to a leakage detection device of an energy storage system, which comprises:
a housing 2 having a through hole formed therethrough;
the rotatable probe is arranged in the shell 2 and is opposite to the through hole;
the push rod mechanism is embedded in the shell 2 and is in transmission connection with the rotatable probe so as to drive the rotatable probe to pass through the through hole and extend out of the shell 2; the push rod mechanism is electrically connected with the rotatable probe;
the universal meter 13 is arranged on the rod wall of the push rod mechanism; the universal meter 13 is electrically connected with the push rod mechanism;
the data processing control unit is arranged in the shell 2 and is electrically connected with the universal meter 13;
and the wireless transmission unit 33 is arranged in the shell 2 and is electrically connected with the data processing unit.
Specifically, the housing 2, the telescopic measurement probe and the push rod structure may be made of a sheet metal part or a plastic part having a good hardness to have a strong structural strength.
The flexible measuring probe 1 includes rotatable probe and push rod mechanism, rotatable probe and push rod mechanism interconnect, and all locate in casing 2, rotatable probe with the latter half that the push rod is connected is cylindricly, and the diameter of this cylindric bottom surface circle is less than the ground circle diameter of push rod structure, and the first half of rotatable probe is the triangular pyramid structure, and inclines in the cylindric of the latter half to make rotatable probe more nimble when measuring the battery that awaits measuring.
The push rod structure is embedded in the shell 2 and completely fixed, and can drive the rotatable probe to shuttle back and forth in the through hole of the shell 2 under the condition of being electrically connected with the rotatable probe.
In order to improve the flexibility that rotatable probe detected to the battery that awaits measuring, rotatable probe includes:
the mounting rod 17 is embedded in the push rod mechanism;
the second measuring head is arranged in the inner cavity of the mounting rod and is electrically connected with the data processing control unit;
and the first measuring head 18 is exposed out of the inner cavity of the mounting rod and is electrically connected with the data processing control unit.
In particular, the second measuring head is completely embedded in the mounting rod 17, while the first measuring head is partially embedded in the mounting rod 17, partially exposed to the air. Meanwhile, the mounting rod 17 may be provided with a partial through hole so that the second measuring head can obtain the state of the battery to be measured when the battery to be measured is touched in the mounting rod 17, and the second measuring head 18 is controlled in the mounting rod in an exposed manner, so that the state of the battery to be measured can be more accurately determined when the second measuring head is exposed in the air, and the measurement accuracy is provided under the common cooperation of the first measuring head 18 and the second measuring head.
In order to optimize the construction of the push rod mechanism and thereby save the power consumption generated when the push rod structure is operated, the push rod mechanism comprises:
the mounting rod 17 is embedded in the rod top of the electric push rod 11 through the mounting hole;
the mounting cylinder 19 is provided with a mounting groove; the universal meter 13 is arranged on the wall of the installation barrel 19; the electric push rod 11 is connected with the top of the installation barrel 19 through the installation groove.
Specifically, the radius of the cylinder of the electric push rod 11 is smaller than that of the mounting cylinder 19, and the push rod mechanism is subdivided into the mounting cylinder 19 for fixing and the electric push rod 11 for driving the rotatable probe, so that the manufacturing cost of the electric leakage detection device of the energy storage system is saved to a certain extent.
In order to better adjust the electric putter 11 to make the rotatable probe better approach the battery to be measured, the pole top of the electric putter 11 is provided with a movable plate groove structure, and the movable plate groove structure includes:
the mounting seat 14 is arranged on the electric push rod 11; a movable groove is formed in the mounting seat 14, and an LED lamp 15 and a miniature camera 16 are respectively arranged on two sides of the mounting seat;
the mounting plate is arranged in the movable groove and is provided with the mounting hole;
and the motor 12 penetrates through the mounting hole through an output shaft of the motor and is fixedly connected with the mounting plate 14.
In the present embodiment, the LED lamp 15, the micro-camera 16, and even the power pusher 11 and the rotatable probe are powered by the motor 12. When the rotatable probe is used for measuring the storage battery to be measured, the LED lamp 15 is used for providing a light source, and the measuring positions of the first measuring head 18 and the second measuring head in the rotatable probe are continuously adjusted under the coordination of the micro-camera 16, so that the measuring efficiency is improved.
In order to obtain higher reliability and better reverse response, the motor is a micro stepping motor.
It should be noted that the micro stepping motor is a key execution component in the micro electro mechanical system, and is an open-loop control motor for converting an electrical pulse signal into an angular displacement or a linear displacement, specifically, the angular displacement is controlled by controlling the number of pulses, so as to achieve the purpose of accurate positioning; meanwhile, the rotating speed and the rotating acceleration of the motor can be controlled by controlling the pulse frequency, so that the aim of speed regulation is fulfilled.
In order to reduce the access frequency of a data processing control unit during operation, the data processing control unit comprises:
the data reading unit is electrically connected with the universal meter 13;
and the control unit is electrically connected with the motor 12, the electric push rod 11, the data reading unit and the wireless transmission unit 33 respectively.
In the embodiment of the invention, the data processing control unit needs to be electrically connected with the multimeter 13, the motor 12, the electric push rod 11 and the wireless transmission unit 33 at the same time, so that a frequency data access process can occur in the data processing control unit, and in order to avoid a possible jam condition caused by excessive frequency of data interaction, the data processing control unit is divided into a data reading unit and a control unit, wherein the data reading unit is used for reading data of the multimeter 13; and the control unit is responsible for data interaction with the motor 12, the electric push rod 11, the data reading unit and the wireless transmission unit 33.
In order to reduce the access frequency of the control unit during operation, the control unit comprises:
a control circuit 32 for controlling opening and closing of the wireless transmission unit; and is used for driving the electric push rod 11 and the micro stepping motor 12; the control circuit 32 is electrically connected with the micro stepping motor 12, the electric push rod 11, the data reading unit and the wireless transmission unit 33 respectively;
and a clock circuit 34 electrically connected to the control circuit 32 for triggering the control circuit 32.
In the embodiment of the invention, the control unit needs to be electrically connected with the multimeter 13, the micro stepping motor 12, the electric push rod 11 and the wireless transmission unit 33 at the same time, so that the control unit can have a frequency data access process, and in order to avoid the possibility of blockage caused by excessive frequency of data interaction, the control unit is divided into the control circuit 32 and the time circuit 34, wherein the control circuit 32 is responsible for controlling the on/off of the wireless transmission unit; and is used for driving the electric push rod 11 and the micro stepping motor 12; and the clock circuit 34 is responsible for the departure control circuit 32.
In an optional embodiment of the present invention, the control circuit is one of a single chip, an ARM processor, or a PLC.
It should be noted that the single chip is an integrated circuit chip, and is a small and perfect microcomputer system formed by integrating the functions of a central processing unit CPU with data processing capability, a random access memory RAM, a read only memory ROM, various I/O ports and interrupt systems, a timer/counter, etc. onto a silicon chip by using the super-large scale integrated circuit technology. The single chip microcomputer has the advantages of small size, light weight and low price.
The ARM processor is a 32-bit RISC processor architecture that is widely used in many embedded system designs. Has the advantages of high execution efficiency, low cost and the like.
The PLC is a digital operation electronic system specially designed for application in industrial environment, can store instructions for executing operations such as logic operation, sequence control, timing, counting, arithmetic operation and the like in the PLC, controls various mechanical equipment or production processes through digital or analog input and output, and has the advantages of strong anti-interference capability, low failure rate, easiness in equipment expansion, convenience in maintenance and short development period.
In order to improve the security of the data read by the data reading unit, the data reading unit includes:
a data reading circuit 31 for reading data in the multimeter 13;
and a storage circuit 35 electrically connected to the data reading circuit 31 for storing the data read by the data reading circuit 31.
In an embodiment of the present invention, to ensure that a data reading unit is not lost to multimeter 13, the data reading unit is configured as a combination of data reading circuitry 31 and storage circuitry 35, wherein data reading circuitry 31 is used to read data in multimeter 13 and storage circuitry 35 is used to store data read in data reading circuitry 31.
In an alternative embodiment of the present invention, the wireless transmission unit 33 is a wireless communication module.
To facilitate understanding of the leakage detection apparatus of the energy storage system disclosed in the present invention by those skilled in the art, the following description is provided for operation of the leakage detection apparatus of the energy storage system disclosed in the present invention:
the clock circuit 34 triggers the control circuit 32 according to a set clock signal, the control circuit 32 controls the electric push rod 11 and the motor 12 to move, the electric push rod 11 pushes the first measuring head 18 to move linearly so as to adjust the measuring distance of the first measuring head 18, and the motor 12 rotates to drive the first measuring head 18 to rotate around the output shaft of the motor 12 so as to adjust the measuring angle of the first measuring head 18.
When the position of first measuring head 18 is adjusted, first measuring head 18 is close to the battery that awaits measuring, carries out leakage detection to the battery that awaits measuring through universal meter 13 to transmit the detection data for remote client through wireless transmission unit 33, so that the technical staff carries out further judgement.
When the distance between the leakage detecting device and the storage battery to be detected is embedded into the control circuit 32, the control circuit 32 controls the telescopic distance of the electric push rod 11 and the number of rotation turns of the motor 12 according to the electric pulse signal. When the distance between the storage batteries detected by the leakage detection device is unknown, the miniature camera 16 can shoot a picture after the first measuring head 18 moves, the picture is transmitted back to the remote client through the wireless transmission unit 33, and technicians can manually adjust the action time of the electric push rod 11 and the motor 12 through the remote client to enable the first measuring head to be close to the storage batteries to be detected, so that the test work of the storage batteries to be detected is completed.
The above embodiments are only optional embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. An electrical leakage detection apparatus for an energy storage system, comprising:
a housing having a through hole formed therethrough;
the rotatable probe is arranged in the shell and is opposite to the through hole;
the push rod mechanism is embedded in the shell and is in transmission connection with the rotatable probe so as to drive the rotatable probe to pass through the through hole and extend out of the shell; the push rod mechanism is electrically connected with the rotatable probe;
the universal meter is arranged on the rod wall of the push rod mechanism; the universal meter is electrically connected with the push rod mechanism;
the data processing control unit is arranged in the shell and is electrically connected with the universal meter;
and the wireless transmission unit is arranged in the shell and is electrically connected with the data processing unit.
2. The electrical leakage detection apparatus of the energy storage system according to claim 1, wherein the rotatable probe comprises:
the mounting rod is embedded in the push rod mechanism;
the second measuring head is arranged in the inner cavity of the mounting rod and is electrically connected with the data processing control unit;
the first measuring head is exposed in the inner cavity of the mounting rod and is electrically connected with the data processing control unit.
3. An electrical leakage detection apparatus for an energy storage system according to claim 2, wherein the push rod mechanism comprises:
the mounting rod is embedded in the rod top of the electric push rod through the mounting hole;
the mounting cylinder is provided with a mounting groove; the universal meter is arranged on the wall of the installation cylinder; the electric push rod is connected with the top of the mounting cylinder through the mounting groove.
4. The electrical leakage detection device of the energy storage system according to claim 3, wherein a movable plate groove structure is disposed at a top of the electric push rod, and the movable plate groove structure comprises:
the mounting seat is arranged on the electric push rod; a movable groove is formed in the mounting seat, and an LED lamp and a miniature camera are respectively arranged on two sides of the mounting seat;
the mounting plate is arranged in the movable groove and is provided with the mounting hole;
and the motor penetrates through the mounting hole through an output shaft of the motor and is fixedly connected with the mounting plate.
5. The electrical leakage detection device of the energy storage system according to claim 4, wherein the motor is a micro stepper motor.
6. The electrical leakage detection device of the energy storage system according to claim 5, wherein the data processing control unit comprises:
the data reading unit is electrically connected with the universal meter;
and the control unit is electrically connected with the motor, the electric push rod, the data reading unit and the wireless transmission unit respectively.
7. The electrical leakage detection apparatus of the energy storage system according to claim 6, wherein the control unit includes:
a control circuit for controlling the opening and closing of the wireless transmission unit; the micro stepping motor is used for driving the electric push rod and the micro stepping motor; the control circuit is respectively and electrically connected with the micro stepping motor, the electric push rod, the data reading unit and the wireless transmission unit;
and the clock circuit is electrically connected with the control circuit and is used for triggering the control circuit.
8. The electrical leakage detection device of the energy storage system of claim 7, wherein the control circuit is one of a single chip, an ARM processor and a PLC.
9. An electrical leakage detection apparatus for an energy storage system according to any one of claims 6 to 8, wherein the data reading unit comprises:
the data reading circuit is used for reading data in the multimeter;
and the storage circuit is electrically connected with the data reading circuit and is used for storing the data read in the data reading circuit.
10. The electrical leakage detection device of the energy storage system according to any one of claims 9, wherein the wireless transmission unit is a wireless communication module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110350099.8A CN113075582A (en) | 2021-03-31 | 2021-03-31 | Electric leakage detection device of energy storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110350099.8A CN113075582A (en) | 2021-03-31 | 2021-03-31 | Electric leakage detection device of energy storage system |
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| CN113075582A true CN113075582A (en) | 2021-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110350099.8A Pending CN113075582A (en) | 2021-03-31 | 2021-03-31 | Electric leakage detection device of energy storage system |
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|---|---|---|---|---|
| CN204855696U (en) * | 2015-07-16 | 2015-12-09 | 国家电网公司 | Earth detector |
| CN204967077U (en) * | 2015-08-16 | 2016-01-13 | 宋国民 | High tension switchgear's insulator spindle |
| CN106683229A (en) * | 2015-11-10 | 2017-05-17 | 揭雪强 | Vehicle driving recording instrument |
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Application publication date: 20210706 |