CN112311049B - Non-contact power supply super capacitor RGV charging protection method - Google Patents
Non-contact power supply super capacitor RGV charging protection method Download PDFInfo
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- CN112311049B CN112311049B CN202011031637.9A CN202011031637A CN112311049B CN 112311049 B CN112311049 B CN 112311049B CN 202011031637 A CN202011031637 A CN 202011031637A CN 112311049 B CN112311049 B CN 112311049B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0034—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using reverse polarity correcting or protecting circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors
Abstract
The invention provides a charging protection control circuit and a protection method based on the same, aiming at the charging circuit of the existing non-contact power supply super capacitor, aiming at realizing the control modes of quick charging and start-stop control, reverse charging protection and automatic activation of charging and protection by zero electric quantity of the super capacitor charging circuit, realizing the prospect of application of the super capacitor in the RGV industry, and effectively improving the overall safety performance of the super capacitor RGV charging. The charging protection method is based on the fact that a super capacitor charging circuit connected to an RGV body is connected with a charging protection circuit, and the super capacitor RGV charging protection circuit comprises a wiring terminal X1, an insulating wiring terminal MC, a reverse charging protection module, a quick charging start-stop switch module, a zero-electric-quantity automatic activation charging module and a zero-electric-quantity automatic activation charging and protection module.
Description
Technical Field
The invention relates to a circuit design and a control method thereof, which are applied to corresponding safety protection in the charging process of a non-contact power supply type super capacitor RGV, and belong to the field of electrical design.
Background
With the rapid development of the e-commerce logistics and production automation technology, the scale of the automated logistics system and the automated warehousing system is getting larger and larger, and the non-contact power supply super capacitor intelligent RGV becomes one of indispensable devices of the automated logistics system and the automated warehousing system.
The conventional RGV power supply can be divided into a trolley line power supply and a super capacitor (hereinafter referred to as super capacitor) power supply, and the RGV super capacitor power supply has great advantages in large-current charging and discharging capacity, high reliability, maintainability, convenience and energy conservation compared with the trolley line power supply. And along with the gradual perfect upgrade of the super capacity, the volume is reduced due to the improvement of the density, so that the demand of the super capacity power supply is gradually accelerated. The super-capacity RGV power supply has greater advantages than the sliding contact line contact power supply, but because the super-capacity RGV power supply is installed in the RGV equipment body, the super-capacity RGV power supply needs to have more than one set of charging circuit than the sliding contact line power supply circuit, namely the super-capacity charging circuit. Meanwhile, the traditional super-capacity RGV needs to be matched with a lithium battery for use, namely, when the super-capacity electric quantity is insufficient and the body controller is driven to realize a super-capacity quick-charging task, the quick-charging control of the RGV body controller can be realized through the electric quantity of the lithium battery, but the cost of the lithium battery is invisibly increased.
Because the super capacitor has the electrical characteristic, the super capacitor RGV charging circuit needs to consider the links of fast charging control, reverse charging protection, how to realize automatic activation charging and corresponding protection in a zero-electric-quantity state, and the like. 1) The existing quick charge start-stop control needs to meet the requirement of completing a quick charge task in a short time aiming at the charging time efficiency of the RGV. When the super-capacity RGV is out of order or the super-capacity electric quantity is low, the super-capacity RGV automatically runs to a charging position for quick charging, and because the super-capacity RGV has large current (150 plus 200A), the super-capacity RGV charging brush block and the goods shelf brush plate must be fully contacted to be communicated with a charging circuit to realize quick charging, which mainly avoids the situation that the equipment is ignited by arc discharge and even burnt due to insufficient contact between the brush block and the brush plate during quick charging. Similarly, when the super-capacitor RGV completes the quick charging or leaves the charging potential due to the execution of the task in the quick charging process, the charging circuit must be disconnected firstly, and the super-capacitor RGV is driven to leave the charging potential, so that the condition that the equipment is ignited or even burnt out due to arc discharge generated when the brush block of the RGV body is separated from the brush plate of the goods shelf in the quick charging process is mainly avoided. The fast charge start-stop switch has more difficult points of realizing the connection and disconnection of the fast charge circuit, for example, the switch selection type needs to consider the factor of large fast charge current and how to ensure the validity of the opening and closing of the fast charge start-stop switch, so as to improve the stability of the start-stop control switch and the charge circuit; 2) in the conventional reverse charging protection, the RGV super-capacitor is a polar super-capacitor, namely, a positive electrode and a negative electrode are separated, the charging polarity cannot be reversely connected, and the normal operation and even damage of the super-capacitor can be caused by the reverse connection of the positive electrode and the negative electrode. In order to avoid the condition of positive and negative reverse connection of the outgoing line of the super-capacity charging circuit, reverse charging protection needs to be added in the charging circuit; 3) the existing zero-electric-quantity automatic activation charging device has the advantages that when the ultra-capacity RGV is exhausted due to long-time stagnation or due to reasons such as debugging and the like, the body controller cannot normally start a quick-charging switch to complete a charging task, and therefore a zero-electric-quantity automatic activation circuit needs to be added to activate the controller to achieve quick charging. The problem that a slow charging circuit which is automatically activated by zero electric quantity is used for carrying out ultra-capacity charging in a short time cannot be solved in the existing circuit design, and the circuit design cost is high, so that the circuit design of large current cannot be met according to quick charging; 4) the existing zero-power charging circuit protection is not designed by increasing a current-limiting resistor to ensure the circuit safety, and meanwhile, the situations that the RGV body controller fails to start fast charging and timely disconnects a zero-power activation circuit need to be considered, such as the problem of circuit temperature abnormity and a control link of how to quickly and automatically disconnect the charging circuit to protect the charging circuit when the circuit temperature is abnormal and how to automatically recover the working of the charging circuit after the temperature is normal.
In view of this, the present patent application is specifically proposed.
Disclosure of Invention
The invention provides a charging protection control circuit and a protection method based on the same, aiming at solving the problems in the prior art and aiming at the charging circuit of the conventional non-contact power supply super capacitor, so as to realize the control modes of quick charging and start-stop control, reverse charging protection and zero-electric-quantity automatic activation charging and protection of the super capacitor charging circuit, improve the application prospect of the super capacitor in the RGV industry and effectively increase the overall safety performance of the super capacitor RGV charging.
In order to achieve the design purpose, the charging protection method of the non-contact power supply super capacitor RGV is characterized in that a super capacitor charging circuit connected to an RGV body is connected with a charging protection circuit, and the super capacitor RGV charging protection circuit comprises a wiring terminal X1, an insulating wiring terminal MC, a reverse charging protection module, a quick charging start-stop switch module, a zero-electric-quantity automatic activation charging and protection module and a zero-electric-quantity automatic activation charging module; the insulation wiring terminal MC is connected with an inlet/outlet wire of the charging circuit of the super capacitor RGV; the reverse connection protection is carried out on the whole charging circuit based on a diode VDI in the reverse charging protection module; the control of the fast charging start and stop is realized by a main contact of a direct current contactor KM1.1 in a first fast charging start and stop module, a super-capacity RGV controller controls a coil of a contactor KM1 in a second fast charging start and stop module to complete the connection and disconnection of a fast charging main circuit, and an auxiliary contact KM1.2 in a third fast charging start and stop module feeds back the working condition of a contactor KM1 to the super-capacity RGV controller; the zero-electric-quantity automatic activation charging module is realized by a relay KA1 coil and is controlled by an ultra-capacity RGV controller, when the ultra-capacity RGV controller cannot be started up due to ultra-capacity zero electric quantity or low electric quantity, the relay KA1 coil loses power, and the zero-electric-quantity automatic activation charging and protection circuit module is connected with a charging circuit and completes zero-electric-quantity charging activation; the zero-electric-quantity automatic activation charging and protection module comprises a normally closed contact of a direct-current relay KA1.1, a current limiting resistor R0 and a temperature control switch S0 which are connected in series and connected in parallel with the first quick charging start-stop module to form an activation circuit.
Further, the method for protecting charging of the non-contact power supply super capacitor RGV comprises the following specific implementation procedures:
1) ultra-capacity low-power charging
When the super-capacity RGV controller detects that the super-capacity is reduced to the charging capacity, the super-capacity RGV controller controls a main contact of a quick-charging start-stop switch KM1.1 to be closed and connected with a DC48V super-capacity quick-charging circuit, and the zero-electric-quantity automatic activation charging module cannot be started due to the fact that a normally closed contact of a direct-current relay KA1.1 is disconnected; the reverse charging protection module and the first to third quick charging start-stop modules are effective circuits, and the zero-electric-quantity automatic activation charging and protection module is an ineffective circuit;
2) zero-electricity automatic activation charging
When the super-capacity RGV is in a zero-electric-quantity state, the super-capacity RGV controller cannot be started normally, and cannot control the main contact of the direct-current contactor KM1.1 in the first quick-charge start-stop module to be attracted to realize quick charge; a normally closed point of a direct current relay KA1.1 in the zero-electric-quantity automatic activation charging and protecting module is not in a controlled range and is in a closed state, and the ultra-capacity RGV is charged through the zero-electric-quantity automatic activation charging module;
when the ultra-capacity charging electric quantity can activate the ultra-capacity RGV controller, the ultra-capacity RGV controller can control the main contact of the direct contactor KM1.1 in the first quick-charging start-stop module to be attracted so as to finish quick charging, and meanwhile, the constant closing point of the direct current relay KA1.1 in the zero-electric-quantity automatic activation charging and protection module is disconnected, and the zero-electric-quantity automatic activation charging module is disconnected;
firstly, a reverse charging protection module and a zero-electric-quantity automatic activation charging and protection module are used as effective circuits, and first to third quick charging start-stop modules are used as ineffective circuits; and when the ultra-capacitor is activated and charged and the electric quantity can activate the ultra-capacitor RGV controller, the reverse charging protection module and the first to third quick charging start-stop modules are effective circuits, and the zero-electric-quantity automatic activation charging and protection module is converted into an ineffective circuit.
In summary, the charging protection method for the non-contact power supply super capacitor RGV described in the present application has the following advantages: 1. the circuit design scheme of various protection function modular designs is provided, the solution is provided for the problems in the prior art, each protection module can be subsequently expanded and enhanced, the overall design cost is low, and the application and upgrading prospect is good.
2. The charging operation under the quick and zero electric quantity state of current super capacity provides all-round safety protection, and the result of use is comparatively comprehensive and outstanding.
3. Can combine the access realization intelligent control of super capacity body and its control end, charging environment monitoring is comparatively sensitive, and reaction rate is very fast when the abnormal condition takes place, is particularly useful for great automatic logistics system of scale and automation
A warehousing system.
Drawings
The invention will now be further described with reference to the following figures.
FIG. 1 is a schematic diagram of the charging protection circuit for the super-capacitor RGV;
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which are provided to illustrate only the basic idea of the invention in a schematic manner. The components associated with the present invention are illustrated rather than being drawn to scale and depicted in terms of their number, shape, and size in actual implementations, which may vary somewhat from one implementation to another and may have more complex layouts.
In embodiment 1, as shown in fig. 1, the charging protection method for the non-contact power supply super capacitor RGV is implemented by adding a charging protection circuit having the following structure based on a super capacitor, a charging brush block and a brush plate charging circuit connected to an RGV body.
Super capacity RGV protection circuit that charges, including binding post X1, insulating terminal MC, anti-protection module that charges, fill soon and open stop switch module, zero electric quantity automatic activation charge and protection module, zero electric quantity automatic activation charge module.
The insulated wiring terminal MC is connected with an inlet/outlet wire of a super capacitor RGV charging circuit, and can be made of unsaturated polyester glass fiber resin, so that the safety of the quick charging 200A circuit is guaranteed by the advantages of high temperature resistance, good strength, strong insulativity and the like;
the reverse charging protection module comprises at least one group of diodes VDI; in FIG. 1, a charging incoming line is connected into parallel connection diodes VDI1 and VDI2 through an MC-01 binding post, reverse charging protection, namely reverse connection protection, of the whole charging circuit is achieved based on unidirectional conductivity of the diodes, and the diodes VDI adopt Schottky diodes (Vr: 150V, Io: 100A) to meet requirements of a quick charging circuit;
the system comprises a quick-charging start-stop switch module, a first quick-charging start-stop module and a second quick-charging start-stop module, wherein start-stop control is realized by a main contact of a direct current contactor KM1.1 in the first quick-charging start-stop module; in the figure, a charging incoming line circuit passes through a reverse charging protection module and then is connected with a main contact of a direct current contactor KM1.1, an insulation binding post MC-02 and the positive electrode of a super capacitor; the main contact of the direct current contactor KM1.1 realizes the control of the coil of the contactor KM1 in the second quick charge start-stop module through a super-capacity RGV controller, so that the on-off of the quick charge main circuit is completed. Meanwhile, an auxiliary contact KM1.2 in a third quick-charging start-stop module can feed back the working condition of a contactor KM1 to a super-capacity RGV controller so as to monitor the control result of the whole start-stop switch action of the quick-charging start-stop switch module at random time, and the safe and stable operation of a non-contact power supply super capacitor RGV charging circuit is ensured to the maximum extent;
the zero-electric-quantity automatic activation charging module is realized by a relay KA1 coil and is controlled by an ultra-capacity RGV controller, when the ultra-capacity RGV controller cannot be started up due to zero electric quantity or low electric quantity, the relay KA1 coil loses power, the zero-electric-quantity automatic activation charging and protection circuit module is connected with a circuit, and zero-electric-quantity charging activation is completed.
The zero-electric-quantity automatic activation charging and protection module is characterized in that a direct-current relay normally-closed contact KA1.1, a current-limiting resistor R0 and a temperature control switch S0 are connected in series and connected in parallel with a first quick charging start-stop module to form an activation circuit, so that the function of an ultra-capacity RGV zero-electric-quantity automatic activation charging task is realized. When the super capacitor is in a zero-electric-quantity state and the super capacitor RGV controller cannot be automatically started, the main contact of a direct current contactor KM1.1 in the first quick charge start-stop module cannot be connected, a charging circuit is connected into diodes VDI1 and VDI2 which are connected in parallel through an MC-01 wiring terminal, and is connected with an insulation wiring terminal MC-02 through a normally closed contact of a direct current relay KA1.1 to a current limiting resistor R0 and a temperature control switch SO, and then the circuit is connected with the super capacitor anode in a conducting mode to achieve zero-electric-quantity automatic activation charging. The super capacitor can realize the activation of the quick charging circuit when the zero-electric-quantity automatic activation charging and protection module is charged, namely the super capacitor RGV controller can control the super capacitor KM coil. In addition, the current limiting resistor R0 and the temperature control switch S0 in the circuit can also play the roles of current limiting and temperature protection. Namely, when the ultra-capacitor RGV controller is abnormal, the zero-electric-quantity automatic activation charging module cannot be effectively cut off, the temperature of the current-limiting resistor R0 in the circuit can be gradually increased, and when the temperature is increased to the cut-off temperature of the temperature control switch S0 (if the set extreme value is more than or equal to 85 ℃), the circuit can be automatically cut off, so that the zero-electric-quantity charging circuit protection is realized.
And a connecting terminal X1 provides a circuit connection for the super-capacity RGV controller to control the super-capacity second quick-charge start-stop module KM1, the third quick-charge start-stop module KM1.2 and the zero-electric-quantity automatic activation charging module KA1.
The implementation process of the non-contact power supply super capacitor RGV charging protection circuit and the protection method thereof is as follows:
1) ultra-capacity low-power charging
When the ultra-capacity RGV controller detects that the ultra-capacity is reduced to the charging capacity, the RGV runs to a charging position (the brush block of the RGV body is fully contacted with the brush plate), the ultra-capacity RGV controller controls the main contact of the quick-charging start-stop switch KM1.1 to be closed and connected with the DC48V ultra-capacity quick-charging circuit, and the zero-electric-quantity automatic activation charging module cannot be started because the normally-closed contact of the direct-current relay KA1.1 is disconnected; therefore, only the reverse charge protection module and the first to third fast charge start-stop modules are effective circuits at the stage, and the zero-electric-quantity automatic activation charging and protection module is an ineffective circuit;
2) zero-electricity automatic activation charging
When the ultra-capacity RGV is exhausted due to long-time stagnation or debugging and other reasons, the charging station cannot be normally started due to the ultra-capacity RGV controller, the suction of the main contact of the direct current contactor KM1.1 in the first quick charging start-stop module cannot be controlled to realize quick charging, at the moment, the normally closed point of the direct current relay KA1.1 in the zero-electric-quantity automatic activation charging and protection module is not in a controlled range and is in a closed state, and the ultra-capacity RGV can be charged through the zero-electric-quantity automatic activation charging module;
when the super-capacity charging electric quantity can activate the super-capacity RGV controller, the super-capacity RGV controller can control the main contact of the direct contactor KM1.1 in the first quick-charging start-stop module to be attracted so as to finish quick charging, and simultaneously, the zero-electric-quantity automatic activation charging and the normal close point of the direct current relay KA1.1 in the protection module are disconnected so as to cut off the zero-electric-quantity automatic activation charging module and further finish the automatic activation charging of the super-capacity under the zero-electric-quantity state.
Firstly, a reverse charging protection module and a zero-electric-quantity automatic activation charging and protection module are used as effective circuits, and first to third quick charging start-stop modules are used as ineffective circuits; and when the ultra-capacitor is activated and charged and the electric quantity can activate the ultra-capacitor RGV controller, the reverse charging protection module and the first to third quick charging start-stop modules are effective circuits, and the zero-electric-quantity automatic activation charging and protection module is converted into an ineffective circuit.
In summary, the embodiments presented in connection with the figures are only preferred. Those skilled in the art can derive other alternative structures according to the design concept of the present invention, and the alternative structures should also fall within the scope of the solution of the present invention.
Claims (2)
1. A charging protection method for a non-contact power supply super capacitor RGV is characterized by comprising the following steps: the super capacitor RGV charging circuit based on the access RGV body is connected with a super capacitor RGV charging protection circuit, and the super capacitor RGV charging protection circuit comprises a wiring terminal X1, an insulating wiring terminal MC, a reverse charging protection module, a quick charging start-stop switch module, a zero-electric-quantity automatic activation charging module and a zero-electric-quantity automatic activation charging and protection module;
the insulation wiring terminal MC is connected with an inlet wire and an outlet wire of the super capacitor RGV charging circuit;
the reverse connection protection is carried out on the whole charging circuit based on a diode VDI in the reverse charging protection module;
the fast charging start-stop control is realized by a main contact of a direct current contactor KM1.1 in a first fast charging start-stop module, a super capacitor RGV controller controls a coil of a contactor KM1 in a second fast charging start-stop module to complete the connection and disconnection of a fast charging main circuit, and an auxiliary contact KM1.2 in a third fast charging start-stop module feeds back the working condition of a contactor KM1 to the super capacitor RGV controller;
the zero-electric-quantity automatic activation charging module is realized by a coil of a relay KA1 and is controlled by a super capacitor RGV controller; when the super capacitor RGV controller cannot be started by zero or low electric quantity of the super capacitor, the coil of the relay KA1 loses power, the zero electric quantity automatic activation charging and protection circuit module is connected with the super capacitor RGV charging circuit and completes zero electric quantity charging activation;
the zero-electric-quantity automatic activation charging and protection module comprises a normally closed contact of a direct-current relay KA1.1, a current limiting resistor R0 and a temperature control switch S0 which are connected in series and connected in parallel with the first quick charging start-stop module to form an activation circuit.
2. The RGV charging protection method for non-contact power supply super capacitor as claimed in claim 1, characterized in that: the method comprises the following implementation procedures of,
1) super capacitor low-power charging
When the super capacitor RGV controller detects that the capacity of the super capacitor is reduced to the charging capacity, the super capacitor RGV controller controls a main contact of a quick charging start-stop switch KM1.1 to be closed and connected with a DC48V super capacitor quick charging circuit, and a zero-electric-quantity automatic activation charging module cannot be started due to the fact that a normally closed contact of a direct current relay KA1.1 is disconnected; the reverse charging protection module and the first to third quick charging start-stop modules are effective circuits, and the zero-electric-quantity automatic activation charging and protection module is an ineffective circuit;
2) zero-electricity automatic activation charging
When the super capacitor RGV is in a zero-electric-quantity state, the super capacitor RGV controller cannot be started normally, and the direct current contactor KM1.1 in the first quick-charging start-stop module cannot be controlled to be attracted to realize quick charging; a normally closed point of a direct current relay KA1.1 in the zero-electric-quantity automatic activation charging and protecting module is not in a controlled range and is in a closed state, and the super capacitor RGV automatically activates the charging module through the zero-electric-quantity to charge;
when the charging electric quantity of the super capacitor can activate the super capacitor RGV controller, the super capacitor RGV controller can control the main contact of the direct contactor KM1.1 in the first quick-charging start-stop module to be attracted so as to finish quick charging, and meanwhile, the constant closing point of the direct current relay KA1.1 in the zero-electric-quantity automatic activation charging and protection module is disconnected, and the zero-electric-quantity automatic activation charging module is disconnected;
firstly, a reverse charging protection module and a zero-electric-quantity automatic activation charging and protection module are used as effective circuits, and first to third quick charging start-stop modules are used as ineffective circuits; and when the super capacitor is activated and charged and the electric quantity can activate the super capacitor RGV controller, the reverse charge protection module and the first to third fast charge start-stop modules are effective circuits, and the zero-electric-quantity automatic activation charging and protection module is converted into an ineffective circuit.
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| CN202535168U (en) * | 2012-03-15 | 2012-11-14 | 昆兰新能源技术常州有限公司 | Bus capacitor charging circuit of photovoltaic inverter |
| CN106712269A (en) * | 2015-07-23 | 2017-05-24 | 南京理工大学常熟研究院有限公司 | Intelligent digital dual-power-supply switching device and fault self-checking method thereof |
| CN110341484A (en) * | 2019-07-25 | 2019-10-18 | 中车株洲电力机车有限公司 | Super capacitor energy-storing power supply guard method and system |
| CN211428974U (en) * | 2020-02-11 | 2020-09-04 | 柯贝尔电能质量技术（上海）有限公司 | RGV super-capacity power supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200929777A (en) * | 2007-12-26 | 2009-07-01 | Felis Power Technic Inc | A battery protection device that utilizes weak current to control strong current |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202535168U (en) * | 2012-03-15 | 2012-11-14 | 昆兰新能源技术常州有限公司 | Bus capacitor charging circuit of photovoltaic inverter |
| CN106712269A (en) * | 2015-07-23 | 2017-05-24 | 南京理工大学常熟研究院有限公司 | Intelligent digital dual-power-supply switching device and fault self-checking method thereof |
| CN110341484A (en) * | 2019-07-25 | 2019-10-18 | 中车株洲电力机车有限公司 | Super capacitor energy-storing power supply guard method and system |
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Address after: No.2 workshop, No.321 Jinrong Road, high tech Zone, Qingdao City, Shandong Province Applicant after: Kejie Intelligent Technology Co.,Ltd. Address before: No.2 workshop, No.321 Jinrong Road, high tech Zone, Qingdao City, Shandong Province Applicant before: KENGIC INTELLIGENT EQUIPMENT Co.,Ltd. |
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