CN211477251U - Coil non-magnetic gating induction metering device - Google Patents
Coil non-magnetic gating induction metering device Download PDFInfo
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- CN211477251U CN211477251U CN202020533634.4U CN202020533634U CN211477251U CN 211477251 U CN211477251 U CN 211477251U CN 202020533634 U CN202020533634 U CN 202020533634U CN 211477251 U CN211477251 U CN 211477251U
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Abstract
The utility model relates to a coil non-magnetic gating induction metering device, which comprises an excitation circuit, an external excitation coil component, a controller, a first built-in induction coil component, a second built-in induction coil component and a third built-in induction coil component; the output end of the controller is connected with the exciting circuit, and a driving pulse signal is sent to the external exciting coil assembly through the exciting circuit; the input end and the output end of the first built-in induction coil assembly, the second built-in induction coil assembly and the third built-in induction coil assembly are connected with the controller. The utility model discloses a mode of outer lane coil excitation, inner circle coil response distinguishes the position of sheetmetal on the current no magnetism pointer piece through signal processing circuit to realize the measurement, can prevent the interference of factors such as external magnetic force and external light.
Description
Technical Field
The utility model relates to a coil measurement technical field, in particular to coil no magnetic type gating response metering device.
Background
At present, the reading of meters such as gas meters, water meters and the like mainly adopts the following modes: 1) photoelectric direct reading, complex assembly and detection process, high production cost and easy interference by external light; 2) the pulse direct-reading meter using the reed switch or the Hall device is easily interfered by an external magnetic field.
The coil type non-magnetic sensing technology can be used for solving the problems, the induced current above the area of the metal sheet without the magnetic pointer sheet is small, the induced current above the nonmetal is large in a mode of outer coil excitation and inner coil induction, and the position of the metal sheet on the current non-magnetic pointer sheet is distinguished through the signal processing circuit, so that the metering is realized. But at present can only detect whether have the sheetmetal below the induction coil, can not accurate judgement sheetmetal just all rotate to induction coil below or only a part rotates to induction coil below, can not the accurate position of judging the sheetmetal for there is the error in the measurement.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to improve the not enough that exists among the prior art, provide a coil no magnetic type gating response metering device.
In order to realize the purpose of the utility model, the embodiment of the utility model provides a following technical scheme:
a non-magnetic gating induction metering device for a coil comprises an exciting circuit, an external exciting coil assembly, a controller, a first built-in induction coil assembly, a second built-in induction coil assembly and a third built-in induction coil assembly; the output end of the controller is connected with the exciting circuit, and a driving pulse signal is sent to the external exciting coil assembly through the exciting circuit; the input end and the output end of the first built-in induction coil assembly, the second built-in induction coil assembly and the third built-in induction coil assembly are connected with the controller.
The controller is used for sending a driving pulse signal to the external exciting coil assembly through the exciting circuit to excite the built-in induction coil assembly, the controller controls the gating state of the built-in induction coil assembly, and the controller processes the returned signal to judge the position of the metal sheet.
Furthermore, to describe the arrangement position of the built-in induction coil assembly in more detail, the first built-in induction coil assembly, the second built-in induction coil assembly and the third built-in induction coil assembly are arranged inside the external excitation coil assembly, and the first built-in induction coil assembly and the third built-in induction coil assembly are adjacent to the second built-in induction coil assembly, but the first built-in induction coil assembly and the third built-in induction coil assembly are not adjacent.
As another embodiment of the arrangement position of the built-in induction coil assemblies, the first built-in induction coil assembly, the second built-in induction coil assembly and the third built-in induction coil assembly are arranged inside the external excitation coil assembly, and the first built-in induction coil assembly, the second built-in induction coil assembly and the third built-in induction coil assembly are adjacent to each other in pairs.
Furthermore, in order to further improve a circuit for processing the induced current, the controller is a single chip microcomputer, the single chip microcomputer is provided with a comparator, and output ends of the first built-in induction coil assembly, the second built-in induction coil assembly and the third built-in induction coil assembly are connected with the comparator.
Furthermore, the excitation circuit comprises a resistor R1, a capacitor C1 and a multi-way NAND gate circuit U2, one end of the resistor R1 is connected with the single chip microcomputer through a P1.0 interface, the other end of the resistor R1 is respectively connected with one end of the capacitor C1 and the input end of the multi-way NAND gate circuit U2, the other end of the capacitor C1 is grounded, and the output end of the multi-way NAND gate circuit U2 is connected with the external excitation coil assembly; the single chip microcomputer sends a control signal to the exciting circuit through the P1.0 interface, and the exciting circuit sends a driving pulse signal to the external exciting coil assembly.
Furthermore, the coil non-magnetic gating induction metering device also comprises a multi-channel NAND gate circuit U3;
the first built-in induction coil assembly comprises an inductor L2 and a triode Q1, the second built-in induction coil assembly comprises an inductor L3 and a triode Q3, and the third built-in induction coil assembly comprises an inductor L4 and a triode Q2;
the single chip microcomputer sends a control signal to the multi-channel NAND gate circuit U3 through a P3.0 interface to control the conduction of the triode Q1, the triode Q2 and the triode Q3, and a current signal is amplified by the triode Q1, the triode Q2 and the triode Q3 and then output to the comparator.
Furthermore, the single chip microcomputer is also provided with a timer;
the comparator compares the voltage input by the triode Q1 and the voltage input by the triode Q2, if the voltage input by the triode Q1 is higher than the voltage input by the triode Q2, the single chip microcomputer discharges to the triode Q1 through a P5.0 interface, if the voltage input by the triode Q1 is lower than the voltage input by the triode Q2, the single chip microcomputer discharges to the triode Q2 through a P4.0 interface, and after the single chip microcomputer discharges to the triode Q1 or the triode Q2, the timer reads the time t1 when the output of the comparator is reversed;
the single chip microcomputer discharges to the triode Q3 through the P4.0 interface, and after the single chip microcomputer discharges to the triode Q3, the timer reads the time t2 when the output of the comparator is reversed.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a mode of outer lane coil excitation, inner circle coil response, the direct input signal as the singlechip comparator after enlargiing induction coil's induced voltage, according to the output cooperation timer of comparator, distinguish the position of sheetmetal on the current no magnetism pointer piece through signal processing, can judge sheetmetal rotational position to realize the measurement, can prevent the interference of factors such as external magnetic force and external light, the measurement mode is simple reliable, and the interference killing feature is stronger.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of a meter measurement system;
fig. 2 is a schematic diagram of a coil arrangement of a metering device in embodiment 1 of the present invention;
fig. 3 is a schematic circuit diagram of a metering device according to embodiment 1 of the present invention;
fig. 4 is a schematic diagram of a coil arrangement of a metering device in embodiment 2 of the present invention;
fig. 5 is a schematic circuit diagram of a metering device according to embodiment 2 of the present invention.
Description of the main elements
The device comprises a non-metal sheet 1, a metal sheet 2, a metering device 3, a rotating shaft 4, an external excitation coil assembly 5, a first built-in induction coil assembly 6, a second built-in induction coil assembly 7 and a third built-in induction coil assembly 8.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Also, in the description of the present invention, the terms "first," "second," and the like are used solely for distinguishing between the descriptions and not necessarily for indicating or implying any actual such relationship or order between such entities or operations.
Example 1:
as shown in fig. 1, the metering device is usually located above the non-magnetic pointer sheet, a metal sheet and a non-metal sheet are adhered to the top of the non-magnetic pointer sheet, the center of the metering device and the non-magnetic pointer sheet is passed through by a rotating shaft, and the metal sheet and the non-metal sheet are driven to rotate, the metering device monitors the positions of the metal sheet and the non-metal sheet, thereby realizing the metering, and then the utility model discloses the circuit and the principle that the metering device relates to will be described in detail.
The utility model discloses a following technical scheme realizes, a coil no magnetic gate response metering device, including excitation circuit, outer excitation coil assembly 5, controller, the built-in induction coil assembly 7 of first built-in induction coil assembly 6, second, the built-in induction coil assembly 8 of third. As shown in fig. 2, in the present embodiment, the first built-in induction coil assembly 6, the second built-in induction coil assembly 7, and the third built-in induction coil assembly 8 are disposed inside the external excitation coil assembly 5, and the first built-in induction coil assembly 6 and the third built-in induction coil assembly 8 are both adjacent to the second built-in induction coil assembly 7, but the first built-in induction coil assembly 6 is not adjacent to the third built-in induction coil assembly 8.
The output end of the controller is connected with the exciting circuit, and a driving pulse signal is sent to the external exciting coil assembly through the exciting circuit; the input end and the output end of the first built-in induction coil assembly, the second built-in induction coil assembly and the third built-in induction coil assembly are connected with the controller.
In more detail, as shown in fig. 3, the controller is a single chip microcomputer, and the single chip microcomputer is provided with a comparator and a timer; the excitation circuit comprises a resistor R1, a capacitor C1 and a multi-channel NAND gate circuit U2, a P1.0 interface in an I/O interface of the singlechip is connected with one end of a resistor R1 in the excitation circuit, the other end of the resistor R1 is respectively connected with one end of a capacitor C1 and the input end of the multi-channel NAND gate circuit U2, and the other end of the capacitor C1 is grounded; the external excitation coil assembly comprises an inductor L1 and a capacitor C2, the output end of the multi-channel NAND gate circuit U2 is connected with one end of the capacitor C2 in the external excitation coil assembly, the other end of the capacitor C2 is connected with one end of an inductor L1, and the other end of the inductor L1 is grounded.
The coil non-magnetic gating induction metering device also comprises a multi-channel NAND gate circuit U3; the first built-in induction coil assembly comprises an inductor L2, a triode Q1, a resistor R2 and a resistor R3; the second built-in induction coil assembly comprises an inductor L3, a triode Q3, a resistor R7 and a resistor R10; the third built-in induction coil assembly comprises an inductor L4, a triode Q2, a resistor R4 and a resistor R13. The P3.0 interface of the single chip microcomputer is connected with the input end of a multi-channel NAND gate circuit U3, the output end of the multi-channel NAND gate circuit is connected with one end of a resistor R3, one end of a resistor R4 and one end of a resistor R7 respectively, the other end of the resistor R3 is connected with an emitter of a triode Q1, the base of the triode Q1 is connected with one end of an inductor L2 and one end of the resistor R2 respectively, and the other end of the resistor R2 is grounded; the other end of the resistor R4 is connected with an emitter of the triode Q2, a base of the triode Q2 is respectively connected with one end of the inductor L4 and one end of the resistor R13, and the other end of the resistor R13 is grounded; one end of the resistor R7 is connected with an emitter of the triode Q3, a base of the triode Q3 is respectively connected with one end of the inductor L3 and one end of the resistor R10, and the other end of the resistor R10 is grounded; the other end of the inductor L2 and the other end of the inductor L3 are respectively connected with the other end of the inductor L4; the collector of the triode Q1 and the collector of the triode Q2 are respectively connected with the positive input end C + and the negative input end C-of the comparator in the single chip microcomputer, and the collector of the triode Q3 is connected with the negative input end C-of the comparison result. The P4.0 interface of the singlechip is also connected with the collector of the triode Q2 and the collector of the triode Q3 respectively, and the P5.0 interface of the singlechip is also connected with the collector of the triode Q1.
The above is the circuit connection mode of the metering device of the present embodiment, and the operating principle thereof is as follows:
the single chip microcomputer sends a control signal to the exciting circuit through the P1.0 interface, and the exciting circuit sends a driving pulse signal to the external exciting coil assembly, so that the first built-in induction coil assembly, the second built-in induction coil assembly and the third built-in induction coil assembly are driven. Meanwhile, the singlechip controls the multi-channel NAND gate U3 through a P3.0 interface to enable the triode Q1 and the triode Q2 to be conducted, and the first built-in induction coil assembly and the third built-in induction coil assembly are not adjacent, so that a metal sheet cannot be arranged below the first built-in induction coil assembly and the third built-in induction coil assembly at the same time, but when the metal sheet is arranged below the induction coil assembly, the induction current output by the singlechip is smaller than the induction current output by the singlechip when the metal sheet is not arranged below the induction coil assembly.
The induced current is amplified by the transistor Q1 and the transistor Q2 and then is input to the pin C + and the pin C-of the comparator, respectively, and the output of the comparator can determine whether the voltage input by the transistor Q1 is high or the voltage input by the transistor Q2 is high. If the voltage input by the triode Q1 is higher than the voltage input by the triangular hook Q2, the single chip microcomputer discharges to the triode Q1 through the P5.0 interface; if the voltage input by the triode Q2 is higher than the voltage input by the triode Q1, the single chip microcomputer discharges to the triode Q2 through the P4.0 interface. And (3) starting timing by the timer while discharging, recording time t1 when the output of the comparator is reversed, namely when the voltage is lower than the other end of the comparator after the high-voltage end discharges, the output of the comparator is reversed, and recording discharge t1, wherein the time t1 reflects the position of the metal sheet relative to the first built-in induction coil assembly and the third built-in induction coil assembly.
After the induction voltages of the first built-in induction coil assembly and the third built-in induction coil assembly are measured, the singlechip controls a multi-channel NAND gate U3 through a P3.0 interface to conduct a triode Q3, to test the induction voltage of the second built-in induction coil component, the current is amplified by the triode Q3 and then input to the C-pin of the comparator, at the moment, the voltage of the C + pin of the comparator is replaced by the reference voltage in the singlechip, the reference voltage is selected to be less than the voltage of the metal sheet under the second built-in induction coil component, the induced voltage of the second built-in inductive coil assembly can be made always greater than the selected internal reference voltage, then the single chip microcomputer discharges the triode Q3 through the P4.0 interface, and simultaneously the timer starts to time, the time t2 is recorded when the comparator input reverses, which time t2 reflects the position of the sheet metal relative to the second built-in inductive coil assembly. The position of the metal sheet and the forward rotation or reverse rotation direction thereof can be judged according to the recorded time t1 and time t2, so that the metering is completed.
It should be noted that the position of the semicircular metal sheet determines the size of time t1 and time t2, when the semicircular metal sheet rotates below the induction coil, t1 and t2 change from large to small, and change by one cycle, that is, the metal sheet rotates by one turn, and it can be determined whether the metal sheet rotates forward or backward by recording time t1 and time t2, who changes by one cycle first.
It should be noted that the present invention can use other I/O input/output interfaces of the single chip microcomputer to connect with the coil assembly, and only individual interfaces are listed in the embodiment.
Example 2:
as another practical way, a coil non-magnetic gating induction metering device includes an excitation circuit, an external excitation coil assembly 5, a controller, a first built-in induction coil assembly 6, a second built-in induction coil assembly 7, and a third built-in induction coil assembly 8. As shown in fig. 4, in the present embodiment, the first built-in induction coil assembly 6, the second built-in induction coil assembly 7, and the third built-in induction coil assembly 8 are disposed inside the external excitation coil assembly 5, and the first built-in induction coil assembly 6, the second built-in induction coil assembly 7, and the third built-in induction coil assembly 8 are adjacent to each other.
As shown in fig. 5, in this embodiment, the single chip microcomputer is connected to the excitation circuit through a P1.0 interface, the excitation circuit is connected to the external excitation coil assembly, the single chip microcomputer is connected to an input end of a multi-way nand gate circuit U3 through a P3.09 interface, an output end of the multi-way nand gate circuit U3 is connected to an emitter of a transistor Q1, an emitter of a transistor Q2, and an emitter of a transistor Q3, respectively, a base of a transistor Q1 is connected to one end of an inductor L2, a base of the transistor Q3 is connected to one end of an inductor L3, a base of a transistor Q2 is connected to one end of the inductor L4, and another ends of an inductor L2 and an inductor L3 are connected to another end of; the collector of the transistor Q1 and the collector of the transistor Q2 are both connected with the C + pin of the comparator, and the collector of the transistor Q3 is connected with the C-pin of the comparator. The single chip microcomputer is connected with a collector electrode of the triode Q3 through a P4.0 interface, and is respectively connected with a collector electrode of the triode Q1 and a collector electrode of the triode Q2 through a P5.0 interface.
The above is the circuit connection mode of the metering device in this embodiment, and the rest is the same as that in embodiment 1, and the operating principle is as follows:
the single chip microcomputer sends a control signal to the exciting circuit through the P1.0 interface, and the exciting circuit sends a driving pulse signal to the external exciting coil assembly, so that the first built-in induction coil assembly, the second built-in induction coil assembly and the third built-in induction coil assembly are driven. Meanwhile, the single chip microcomputer controls the multi-channel NAND gate U3 through a P3.0 interface to enable the triode Q1 and the triode Q3 to be conducted, and when a metal sheet is arranged below the built-in induction coil assembly or the area corresponding to the metal sheet below the built-in induction coil assembly is larger than the area corresponding to the metal sheet below other built-in induction coil assemblies, the output induction current is small.
The induced current is amplified by the transistor Q1 and the transistor Q3 and then input to a pin C + and a pin C-of the comparator, and the output of the comparator can judge whether the voltage input by the transistor Q1 is high or the voltage input by the transistor Q3 is high. If the voltage input by the triode Q1 is higher than the voltage input by the triode Q3, the single chip microcomputer discharges to the triode Q1 through the P5.0 interface; if the voltage input by the triode Q3 is higher than the voltage input by the triode Q1, the single chip microcomputer discharges to the triode Q3 through the P4.0 interface. While discharging, the timer begins counting and when the comparator output reverses, time t1 is recorded, the amount of time t1 reflecting the position of the sheet metal relative to the first and second built-in inductive coil assemblies.
After the induction voltages of the first built-in induction coil assembly and the second built-in induction coil assembly are measured, the single chip microcomputer controls the multi-way NAND gate U3 through the P3.0 interface to enable the triode Q2 and the triode Q3 to be conducted so as to test the induction voltages of the second built-in induction coil assembly and the third built-in induction coil assembly, current is amplified through the triode Q2 and the triode Q3 and then is respectively input to a C + pin and a C-pin of the comparator, and the output of the comparator can be used for judging whether the voltage input by the triode Q2 is high or the voltage input by the triode Q3 is high. If the voltage input by the triode Q2 is higher than the voltage input by the triode Q3, the single chip microcomputer discharges to the triode Q2 through the P5.0 interface; if the voltage input by the triode Q3 is higher than the voltage input by the triode Q2, the single chip microcomputer discharges to the triode Q3 through the P4.0 interface. While discharging, the timer begins counting and when the comparator output reverses, time t2 is recorded, the magnitude of t2 reflecting the position of the sheet metal relative to the second and third built-in inductive coil assemblies. The position of the metal sheet and the forward rotation or reverse rotation direction thereof can be judged according to the recorded time t1 and time t2, so that the metering is completed.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The utility model provides a coil no magnetic type gating induction metering device which characterized in that: the device comprises an excitation circuit, an external excitation coil assembly, a controller, a first built-in induction coil assembly, a second built-in induction coil assembly and a third built-in induction coil assembly; the output end of the controller is connected with the exciting circuit, and a driving pulse signal is sent to the external exciting coil assembly through the exciting circuit; the input end and the output end of the first built-in induction coil assembly, the second built-in induction coil assembly and the third built-in induction coil assembly are connected with the controller.
2. A coil-magnet-free gated induction metering device as claimed in claim 1, wherein: the first built-in induction coil assembly, the second built-in induction coil assembly and the third built-in induction coil assembly are arranged in the outer excitation coil assembly, the first built-in induction coil assembly and the third built-in induction coil assembly are adjacent to the second built-in induction coil assembly, but the first built-in induction coil assembly and the third built-in induction coil assembly are not adjacent.
3. A coil-magnet-free gated induction metering device as claimed in claim 1, wherein: the first built-in induction coil assembly, the second built-in induction coil assembly and the third built-in induction coil assembly are arranged in the outer excitation coil assembly, and the first built-in induction coil assembly, the second built-in induction coil assembly and the third built-in induction coil assembly are adjacent to each other in pairs.
4. A coil-magnet-free gated induction metering device as claimed in claim 2, wherein: the controller is a single chip microcomputer, the single chip microcomputer is provided with a comparator, and the output ends of the first built-in induction coil assembly, the second built-in induction coil assembly and the third built-in induction coil assembly are connected with the comparator.
5. The coil non-magnetic gating induction metering device of claim 4, wherein: the excitation circuit comprises a resistor R1, a capacitor C1 and a multi-channel NAND gate circuit U2, one end of the resistor R1 is connected with the single chip microcomputer through a P1.0 interface, the other end of the resistor R1 is respectively connected with one end of the capacitor C1 and the input end of the multi-channel NAND gate circuit U2, the other end of the capacitor C1 is grounded, and the output end of the multi-channel NAND gate circuit U2 is connected with the external excitation coil assembly; the single chip microcomputer sends a control signal to the exciting circuit through the P1.0 interface, and the exciting circuit sends a driving pulse signal to the external exciting coil assembly.
6. The coil non-magnetic gating induction metering device of claim 5, wherein: the coil non-magnetic gating induction metering device also comprises a multi-channel NAND gate circuit U3;
the first built-in induction coil assembly comprises an inductor L2 and a triode Q1, the second built-in induction coil assembly comprises an inductor L3 and a triode Q3, and the third built-in induction coil assembly comprises an inductor L4 and a triode Q2;
the single chip microcomputer sends a control signal to the multi-channel NAND gate circuit U3 through a P3.0 interface to control the conduction of the triode Q1, the triode Q2 and the triode Q3, and a current signal is amplified by the triode Q1, the triode Q2 and the triode Q3 and then output to the comparator.
7. The coil non-magnetic gating induction metering device of claim 6, wherein: the single chip microcomputer is also provided with a timer;
the comparator compares the voltage input by the triode Q1 and the voltage input by the triode Q2, if the voltage input by the triode Q1 is higher than the voltage input by the triode Q2, the single chip microcomputer discharges to the triode Q1 through a P5.0 interface, if the voltage input by the triode Q1 is lower than the voltage input by the triode Q2, the single chip microcomputer discharges to the triode Q2 through a P4.0 interface, and after the single chip microcomputer discharges to the triode Q1 or the triode Q2, the timer reads the time t1 when the output of the comparator is reversed;
the single chip microcomputer discharges to the triode Q3 through the P4.0 interface, and after the single chip microcomputer discharges to the triode Q3, the timer reads the time t2 when the output of the comparator is reversed.
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| CN202020533634.4U CN211477251U (en) | 2020-04-13 | 2020-04-13 | Coil non-magnetic gating induction metering device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022166002A1 (en) * | 2021-02-05 | 2022-08-11 | 杭州为峰智能科技有限公司 | Anti-radio frequency interference metering module and rotation counting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022166002A1 (en) * | 2021-02-05 | 2022-08-11 | 杭州为峰智能科技有限公司 | Anti-radio frequency interference metering module and rotation counting device |
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Address after: No. 536, Section 1, airport 1st Road, Southwest Airport, Shuangliu District, Chengdu, Sichuan 610211 Patentee after: Chengdu Qianjia Technology Co.,Ltd. Address before: No. 536, Section 1, airport 1st Road, Southwest Airport, Shuangliu District, Chengdu, Sichuan 610211 Patentee before: Chengdu Qianjia Technology Co.,Ltd. |
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