CN210242942U - Quartz sensor vehicle weighing system - Google Patents
Quartz sensor vehicle weighing system Download PDFInfo
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- CN210242942U CN210242942U CN201921000953.2U CN201921000953U CN210242942U CN 210242942 U CN210242942 U CN 210242942U CN 201921000953 U CN201921000953 U CN 201921000953U CN 210242942 U CN210242942 U CN 210242942U
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Abstract
The utility model discloses a quartz sensor vehicle weighing system mainly includes frame, detection module and pre-buried line box, frame top lateral wall fixed mounting has the bolt groove ring, and bolt groove ring upper portion has the clamping ring through bolt assembly mounting, the bullet board is installed to the crimping between bolt groove ring top lateral wall and the clamping ring bottom lateral wall, and the through-hole has been seted up at the bullet board middle part, and the through-hole inboard runs through to peg graft has the rotary joint, and rotary joint top fixed mounting has even frame, and even frame top edge outer wall fixed mounting has the bolt seat that the symmetry set up, and bolt seat outside upper portion cover is established and is installed the loading board. The utility model has reasonable structure design, the device can automatically detect fault information, automatically alarm and give maintenance suggestions, and engineers are required to be arranged for offline treatment if the fault information can not be treated, thereby reducing the maintenance cost and shortening the repair period when in use; and the pressure sensing structure made of quartz material is adopted to replace a resistance strain gauge, so that the structure is simple, the influence of temperature is small, the sensitivity is high, and the practicability is high.
Description
Technical Field
The utility model relates to a piezoelectric sensor specifically is a quartz sensor vehicle weighing system.
Background
Piezoelectric sensors are sensors that are made using the piezoelectric effect of certain dielectrics when subjected to a force. The piezoelectric effect is a phenomenon in which electric charges are generated on the surface of some dielectrics due to a polarization phenomenon of internal electric charges when the dielectrics are deformed (including bending and stretching deformation) by an external force in a certain direction. Piezoelectric materials it can be divided into piezoelectric single crystals, piezoelectric polycrystals and organic piezoelectric materials. Most used in piezoelectric sensors are various piezoelectric ceramics belonging to piezoelectric polycrystals and quartz crystals among piezoelectric single crystals. Other piezoelectric single crystals include lithium niobate, lithium tantalate, lithium gallate, bismuth germanate and the like which are suitable for high-temperature radiation environments.
The existing vehicle weighing system mostly adopts the resistance strain gauge to carry out weight detection, and the resistance strain gauge is more limited in dynamic weighing: the measuring range is small, the elastomer structure is complex, the service life is short, the sensitivity is low, the service temperature range is small, and the practicability is poor; when the dynamic weighing system is used, if a fault occurs in the conventional dynamic weighing computing system for the vehicle, fault information cannot be acquired in time, a client cannot check and repair the dynamic weighing computing system by himself, an engineer must be assigned to go to repair the dynamic weighing computing system, and the maintenance cost and the repair period are improved.
Disclosure of Invention
An object of the utility model is to provide a quartz sensor vehicle weighing system to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a quartz sensor vehicle weighing system mainly comprises an outer frame, a detection module and a pre-buried wire box, wherein a bolt groove ring is fixedly installed on the side wall of the top end of the outer frame, a compression ring is assembled and installed on the upper portion of the bolt groove ring through a bolt, an elastic plate is installed between the side wall of the top end of the bolt groove ring and the side wall of the bottom end of the compression ring in a compression mode, a through hole is formed in the middle of the elastic plate, a rotary joint is inserted and connected to the inner side of the through hole in a penetrating mode, a connecting frame is fixedly installed at the top end of the rotary joint, symmetrically arranged bolt seats are fixedly installed on the outer wall of the edge of the top end of the connecting frame, a bearing plate is sleeved on the upper portion of the outer side of the bolt seats, the bearing plate is fixedly connected with the bolt seats through counter bore bolts, an upper, inner shell middle part bottom inner wall fixed mounting has the circuit board, and circuit board top left part fixed mounting has the wave filter, circuit board top right part fixed mounting has the amplifier, inner shell top fixed mounting have with circuit board complex closing plate, the anterior fixed mounting in circuit board top has the wire, the wire right-hand member extends to the frame right side outside, the pre-buried line box of wire right-hand member fixed connection, the model of wave filter is ZMCT103C, the model of amplifier is TW-DC-1101.
As a further aspect of the present invention: detect the module and mainly include positive plate, seal membrane, go up quartz piece, negative plate, quartz piece, lower positive plate and short cable down, go up positive plate, go up quartz piece, negative plate, arrange in proper order according to top-down between quartz piece and the lower positive plate down, go up the positive plate, go up quartz piece, negative plate, lower quartz piece and lateral wall be in close contact with respectively about the positive plate down, go up positive plate, go up quartz piece, negative plate, lower quartz piece and the lower positive plate outside cover and be equipped with the seal membrane, the inboard upper portion fixed mounting of seal membrane has short cable, short cable and last positive plate, negative plate and lower positive plate be electric connection respectively, lateral wall fixed connection behind short cable bottom and the circuit board top.
As a further aspect of the present invention: pre-buried line box mainly includes communication module, circuit detection module, binding post, shell and apron, shell rear side inner wall fixed mounting has the PCB board, and PCB board front end left part fixed mounting has binding post, and PCB board front end right part fixed mounting has communication module, PCB board front end upper portion fixed mounting has circuit detection module, binding post arranges for binding post, communication module is JB35GD type wireless communication module, circuit detection module is the CHV-50P type hall voltage sensor who has protective resistor and voltage-stabilizing capacitor, shell front end fixed mounting has the apron.
As a further aspect of the present invention: and a sealing ring is fixedly arranged between the outer wall of the middle part of the lead and the inner wall of the lower part of the outer frame.
As a further aspect of the present invention: the wiring terminal is electrically connected with an external power supply, and the wiring terminal is electrically connected with the lead.
A weighing system method for a quartz sensor vehicle is characterized in that in the manufacturing of an upper positive plate, an upper quartz plate, a negative plate, a lower quartz plate and a lower positive plate, an X-cut quartz crystal plate is processed into the shape and the size required by an outer frame, the shape and the size are generally called as X-cutting, two planes of the cut quartz crystal plate are perpendicular to an X axis, and the upper positive plate, the upper quartz plate, the negative plate, the lower quartz plate and the lower positive plate are arranged in sequence to form a detection module.
As a still further scheme of the invention: the detection module is placed in the inner shell, and will link frame, go up and press frame, loading board and springboard fixed connection, fix the springboard on the frame top through clamping ring cooperation bolt slotware, when the installation, need exert sufficient pretightning force on last pressure frame, the pretightning force is adjusted through the distance between clamping ring and the bolt slotware.
As a still further scheme of the invention: a groove is dug in the ground, the device is placed in the groove, and a gap between the device and the ground is filled by a mixture of epoxy resin and quartz sand.
As a still further scheme of the invention: after the device is electrically connected with an external power supply and a computer at a client or a server, when a detection module in the device is subjected to external load, the quartz crystal pieces are subjected to external force along the X-axis direction, polarization is generated inside the quartz crystal pieces, equal positive and negative charges are generated on two planes vertical to the X-axis, the phenomenon is called longitudinal piezoelectric effect, the two piezoelectric quartz crystal pieces are bonded in opposite polarization directions, negative charges are concentrated on a middle negative plate, positive charges are accumulated on positive plates at two ends, the two capacitors are connected in parallel, the output charges and capacitance are doubled, the output charge amount corresponding to the change of unit deformation distance is large, the charge sensitivity is high, the collected signal voltage is processed by a filter in the device and is amplified by an amplifier and then transmitted to a communication module, and finally the signal is transmitted to the computer at the client or the server, then the weight signal is converted into a weight signal by special software and is displayed visually, and the size of the measured load can be obtained through the voltage value measured by the device.
As a still further scheme of the invention: when a detection module, a filter or an amplifier has a fault, the output voltage is inevitably abnormal, the circuit detection module is connected with a measured circuit in parallel through a resistor R1 connected with a module primary circuit in series, the output detection voltage U2 is in direct proportion to the primary voltage U1, when the signal voltage output by the circuit detection module is abnormal, a fault signal can be sent to a server through a communication module, the server receives the fault signal and feeds the fault signal back to a management client, the fault signal is processed through special detection software installed in the management client, and a pre-stored fault maintenance method is prompted, the management client is prompted to arrange a manager for maintenance, the device is connected in a bolt assembly mode, and the maintenance and the replacement are convenient for the manager.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model has reasonable structure design, the device can automatically detect fault information, automatically alarm and give maintenance suggestions, and engineers are required to be arranged for offline treatment if the fault information can not be treated, thereby reducing the maintenance cost and shortening the repair period when in use; and the pressure sensing structure made of quartz material is adopted to replace a resistance strain gauge, so that the structure is simple, the influence of temperature is small, the sensitivity is high, and the practicability is high.
Drawings
FIG. 1 is a schematic diagram of a quartz sensor vehicle weighing system.
Fig. 2 is a schematic view of the internal structure of a quartz sensor vehicle weighing system.
Fig. 3 is a schematic view of the position of the top view angle between the inner parts of the outer frame in the quartz sensor vehicle weighing system.
FIG. 4 is a schematic view of the positions of the compression ring, the elastic plate, the connecting frame and the rotary joint in the quartz sensor vehicle weighing system at a bottom angle.
FIG. 5 is an electrical schematic diagram of a circuit detection module in a quartz sensor vehicle weighing system.
In the figure: the device comprises an outer frame 1, an upper positive plate 2, a sealing plate 3, a bolt groove ring 4, a compression ring 5, a bolt seat 6, a rotary joint 7, a connecting frame 8, an upper pressing frame 9, a bearing plate 10, an elastic plate 11, a sealing film 12, an inner shell 13, a filter 14, a short cable 15, a lead 16, an amplifier 17, a circuit board 18, an upper quartz piece 19, a negative plate 20, a lower quartz piece 21, a lower positive plate 22, a communication module 23, a circuit detection module 24, a wiring terminal 25, an outer shell 26 and a cover plate 27.
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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected" and "disposed" are to be construed broadly, and may for example be fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-5, in the embodiment of the present invention, a quartz sensor vehicle weighing system mainly comprises an outer frame 1, a detection module and a pre-buried wire box, wherein a bolt slot ring 4 is fixedly installed on a side wall at the top end of the outer frame 1, a pressing ring 5 is installed on the upper portion of the bolt slot ring 4 through a bolt assembly, an elastic plate 11 is installed between a side wall at the top end of the bolt slot ring 4 and a side wall at the bottom end of the pressing ring 5 through a press connection, a through hole is opened in the middle of the elastic plate 11, a rotary joint 7 is inserted into the through hole, a connecting frame 8 is fixedly installed at the top end of the rotary joint 7, symmetrically arranged bolt seats 6 are fixedly installed on the outer wall at the top end edge of the connecting frame 8, a bearing plate 10 is installed on the upper portion of the outer side of the bolt seat 6 in a sleeving manner, the bearing plate 10 is fixedly connected, 1 lower part inner wall fixed mounting of frame has ascending inner shell 13 of opening, and the inboard edge cover of inner shell 13 is established and is installed and detect the module, inner shell 13 middle part bottom inner wall fixed mounting has circuit board 18, and 18 top left parts fixed mounting of circuit board has wave filter 14, 18 top right parts fixed mounting of circuit board has amplifier 17, 13 top fixed mounting of inner shell have with 18 complex closing plate 3 of circuit board, the anterior fixed mounting in 18 top of circuit board has wire 16, the 16 right-hand members in wire extend to the outside on 1 right side of frame, the pre-buried line box of 16 right-hand members fixed connection of wire, filter 14's model is ZMCT103C, amplifier 17's model is TW-DC-1101.
The detection module mainly includes positive plate 2, seal membrane 12, goes up quartz piece 19, negative plate 20, lower quartz piece 21, lower positive plate 22 and stub cable 15, go up positive plate 2, go up quartz piece 19, negative plate 20, arrange in proper order according to top-down's order down between quartz piece 21 and the lower positive plate 22, go up positive plate 2, go up quartz piece 19, negative plate 20, quartz piece 21 and lower positive plate 22 about lateral wall be in close contact with respectively, it is equipped with seal membrane 12 to go up positive plate 2, last quartz piece 19, negative plate 20, lower quartz piece 21 and lower positive plate 22 outside cover, and the inboard upper portion fixed mounting of seal membrane has stub cable 15, stub cable 15 and last positive plate 2, negative plate 20 and lower positive plate 22 be electric connection respectively, 15 bottom and 18 tops of stub cable rear side wall fixed connection.
Pre-buried line box mainly includes communication module 23, circuit detection module 24, binding post 25, shell 26 and apron 27, 26 rear side inner wall fixed mounting of shell has the PCB board, and PCB board front end left part fixed mounting has binding post 25, and PCB board front end right part fixed mounting has communication module 23, PCB board front end upper portion fixed mounting has circuit detection module 24, binding post 25 is the binding post row, communication module 23 is JB35GD type wireless communication module, circuit detection module 24 is the CHV-50P type Hall voltage sensor who has protection resistance and voltage stabilizing capacitor, 26 front end fixed mounting of shell has apron 27.
And a sealing ring is fixedly arranged between the outer wall of the middle part of the lead 16 and the inner wall of the lower part of the outer frame 1.
The connection terminal 25 is electrically connected to an external power source, and the connection terminal 25 is electrically connected to the lead 16.
A quartz sensor vehicle weighing system is described with reference to figures 1-5 of the accompanying drawings:
step one, in the manufacturing of the upper positive plate 2, the upper quartz plate 19, the negative plate 20, the lower quartz plate 21 and the lower positive plate 22, the quartz crystal plate cut by X is processed into the shape and the size required by the outer frame 1, generally, the X cutting is that two planes of the cut quartz crystal plate are vertical to an X axis, and the upper positive plate 2, the upper quartz plate 19, the negative plate 20, the lower quartz plate 21 and the lower positive plate 22 are arranged in sequence to form a detection module;
secondly, the detection module is placed in the inner shell 13, the connecting frame 8, the upper pressing frame 9, the bearing plate 10 and the elastic plate 11 are fixedly connected, the elastic plate 11 is fixed at the top end of the outer frame 1 through the pressing ring 5 in cooperation with the bolt groove ring 4, when the detection module is installed, enough pretightening force needs to be applied to the upper pressing frame 9, and the pretightening force is adjusted through the distance between the pressing ring 5 and the bolt groove ring 4;
thirdly, digging a groove on the ground, placing the device in the groove, and filling a gap between the device and the ground by using a mixture of epoxy resin and quartz sand;
after the device is electrically connected with an external power supply and a computer at a client or a server, when a detection module in the device is under the action of an external load, the quartz crystal pieces are under the action of an external force along the X-axis direction, the internal polarization is generated, and equal positive and negative charges are generated on two planes vertical to the X-axis, the phenomenon is called as longitudinal piezoelectric effect, the two piezoelectric quartz crystal pieces are bonded in opposite polarization directions, negative charges are concentrated on a middle negative plate 20, positive charges are accumulated on positive plates at two ends, which is equivalent to that two capacitors are connected in parallel, the output charges and capacitance are doubled, the output charge amount corresponding to the change of unit deformation distance is large, the charge sensitivity is high, the collected signal voltage is processed by a filter 14 in the device and is amplified by an amplifier 17 and then transmitted to a communication module 23, and finally the signal is transmitted to the computer at the client or the server, then, converting the weight signal into a weight signal by using special software, and visually displaying the weight signal, wherein the size of the measured load can be obtained by using a voltage value measured by the device;
step five, when the detection module, the filter 14 or the amplifier 17 have faults, the output voltage is inevitably abnormal, the circuit detection module 24 is connected with the measured circuit in parallel through a resistor R1 connected with the module primary circuit in series, the output detection voltage U2 is in direct proportion to the primary voltage U1, when the signal voltage output by the circuit detection module 24 is abnormal, a fault signal can be sent to the server through the communication module 23, the server receives the fault signal and feeds the fault signal back to the management client, the fault signal is processed through special detection software installed in the management client, and a prestored fault maintenance method is prompted, the management client is prompted to arrange a manager for maintenance, the device is connected in a bolt assembly mode, and the disassembly, the maintenance and the replacement are convenient for the manager.
The utility model discloses a theory of operation is:
the utility model relates to a quartz sensor vehicle weighing system, quartz crystal sensing element measures is the stress, it is the average value of electric charge to the stress that it produced, that is to say quartz crystal has the ability of carrying out the integral to the load on the whole surface of sensing element (quartz wafer), piezoelectric quartz weighing sensor and strain gauge weighing sensor's biggest difference is that quartz crystal does not have thermoelectric effect, even the temperature transient also can not arouse signal drift, and sensitivity temperature coefficient is very little, about-0.02% ° C, therefore needn' T take special means to compensate the influence of road surface temperature, sensitivity is 40PC/kg, natural frequency is no less than 40KHz, the linearity is no greater than 1% FS, the insulating resistance is no less than 10T Ω, 50T's piezoelectric quartz weighing sensor's weight is only 100kg, easy to assemble;
the device automatically detects fault information, automatically gives an alarm, gives a maintenance suggestion, and arranges an engineer for offline treatment only if the failure can not be treated, thereby reducing the maintenance cost and shortening the repair period when in use; and the pressure sensing structure made of quartz material is adopted to replace a resistance strain gauge, so that the structure is simple, the influence of temperature is small, the sensitivity is high, and the practicability is high.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A quartz sensor vehicle weighing system mainly comprises an outer frame (1), a detection module and a pre-buried wire box, and is characterized in that a bolt groove ring (4) is fixedly mounted on the side wall of the top end of the outer frame (1), a pressing ring (5) is mounted on the upper portion of the bolt groove ring (4) through a bolt in an assembling mode, an elastic plate (11) is mounted between the side wall of the top end of the bolt groove ring (4) and the side wall of the bottom end of the pressing ring (5) in a compression joint mode, a through hole is formed in the middle of the elastic plate (11), a rotary joint (7) is inserted and connected to the inner side of the through hole in a penetrating mode, a connecting frame (8) is fixedly mounted on the top end of the rotary joint (7), bolt seats (6) which are symmetrically arranged are fixedly mounted on the outer wall of the edge of the top end of the connecting frame (8), a bearing plate (10) is sleeved on the upper, go up and press frame (9) top lateral wall in close contact with diving board (11) bottom lateral wall, frame (1) lower part inner wall fixed mounting has ascending inner shell (13) of opening, and the inboard edge cover of inner shell (13) is established and is installed and detect the module, inner shell (13) middle part bottom inner wall fixed mounting has circuit board (18), and circuit board (18) top left part fixed mounting has wave filter (14), circuit board (18) top right part fixed mounting has amplifier (17), inner shell (13) top fixed mounting have with circuit board (18) complex closing plate (3), the anterior fixed mounting in circuit board (18) top has wire (16), wire (16) right-hand member extends to frame (1) right side outside, wire (16) right-hand member fixed connection is pre-buried line box.
2. The quartz sensor vehicle weighing system of claim 1, wherein the detection module mainly comprises an upper positive plate (2), a sealing film (12), an upper quartz plate (19), a negative plate (20), a lower quartz plate (21), a lower positive plate (22) and a short cable (15), the upper positive plate (2), the upper quartz plate (19), the negative plate (20), the lower quartz plate (21) and the lower positive plate (22) are sequentially arranged from top to bottom, the upper positive plate (2), the upper quartz plate (19), the negative plate (20), the lower quartz plate (21) and the upper and lower side walls of the lower positive plate (22) are respectively in close contact with each other, the sealing film (12) is sleeved outside the upper positive plate (2), the upper quartz plate (19), the negative plate (20), the lower quartz plate (21) and the lower positive plate (22), and the short cable (15) is fixedly installed on the upper portion of the inner side of the sealing film (12), short cable (15) and last positive plate (2), negative plate (20) and lower positive plate (22) electric connection respectively, short cable (15) bottom and circuit board (18) top rear side wall fixed connection.
3. The quartz sensor vehicle weighing system of claim 1, wherein the pre-buried line box mainly comprises a communication module (23), a circuit detection module (24), a wiring terminal (25), a housing (26) and a cover plate (27), a PCB is fixedly mounted on the inner wall of the rear side of the housing (26), the wiring terminal (25) is fixedly mounted on the left portion of the front end of the PCB, the communication module (23) is fixedly mounted on the right portion of the front end of the PCB, the circuit detection module (24) is fixedly mounted on the upper portion of the front end of the PCB, the wiring terminal (25) is a wiring terminal row, the communication module (23) is a JB35GD type wireless communication module, the circuit detection module (24) is a CHV-50P type Hall voltage sensor with a protection resistor and a voltage stabilizing capacitor, and the cover plate (27) is fixedly mounted on the front end of the housing (26).
4. The quartz sensor vehicle weighing system of claim 1, wherein a sealing ring is fixedly arranged between the outer wall of the middle part of the lead (16) and the inner wall of the lower part of the outer frame (1).
5. The quartz-sensor vehicle weighing system of claim 3, wherein the terminals (25) are electrically connected to an external power source, the terminals (25) being electrically connected to the wires (16).
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| CN201921000953.2U CN210242942U (en) | 2019-06-28 | 2019-06-28 | Quartz sensor vehicle weighing system |
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| CN201921000953.2U CN210242942U (en) | 2019-06-28 | 2019-06-28 | Quartz sensor vehicle weighing system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112595356A (en) * | 2020-06-06 | 2021-04-02 | 东南大学 | Monitoring system for dynamic weighing, speed measuring and strain testing of expressway/bridge structure based on flexible piezoelectric sensor |
| CN116183010A (en) * | 2023-04-19 | 2023-05-30 | 深圳亿维锐创科技股份有限公司 | Fault diagnosis method, device and equipment for dynamic weighing sensor and storage medium |
-
2019
- 2019-06-28 CN CN201921000953.2U patent/CN210242942U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112595356A (en) * | 2020-06-06 | 2021-04-02 | 东南大学 | Monitoring system for dynamic weighing, speed measuring and strain testing of expressway/bridge structure based on flexible piezoelectric sensor |
| CN116183010A (en) * | 2023-04-19 | 2023-05-30 | 深圳亿维锐创科技股份有限公司 | Fault diagnosis method, device and equipment for dynamic weighing sensor and storage medium |
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Effective date of registration: 20210322 Address after: 518000 No. 501, phase II, kerda industrial building, Zhonghao 1st Road, xiangjiaotang community, Bantian street, Longgang District, Shenzhen City, Guangdong Province Patentee after: Shenzhen keerda Intelligent Equipment Co.,Ltd. Address before: 518100 1-2 / F, xikelda building, Xuexiang Zhonghao 1st Road, Bantian street, Longgang District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN KERTA ELECTRIC EQUIPMENT Co.,Ltd. |