CN214121768U - Pretreatment device of chemical process on-line analyzer - Google Patents
Pretreatment device of chemical process on-line analyzer Download PDFInfo
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- CN214121768U CN214121768U CN202023103407.7U CN202023103407U CN214121768U CN 214121768 U CN214121768 U CN 214121768U CN 202023103407 U CN202023103407 U CN 202023103407U CN 214121768 U CN214121768 U CN 214121768U
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Abstract
The utility model relates to a pretreatment device of a chemical process on-line analyzer, which comprises a controller, a liquid container to be measured, a circulating pump, a filter, a liquid inlet pressure sensor and a liquid outlet pressure sensor, wherein the liquid inlet pressure sensor is arranged at the top of the filter, the liquid outlet pressure sensor is arranged at the liquid outlet of the filter, a main circulation pipeline is communicated with the liquid container to be measured, the circulation pump is arranged on the main circulation pipeline, a liquid output pipeline is communicated with the main circulation pipeline, the liquid output pipeline is communicated with a liquid input pipeline which is communicated with a liquid inlet of the filter, the filter is also communicated with a liquid container to be measured through a liquid return pipeline, the liquid return pipeline is communicated with a sampling pipeline, the liquid output pipeline is provided with a first ball valve and a second ball valve, and a third ball valve is arranged on the liquid input pipeline, and the liquid inlet pressure sensor and the liquid outlet pressure sensor are both in communication connection with the controller. Has the advantages that: the detection precision is improved, and the service life and the maintenance period of the analyzer are prolonged.
Description
Technical Field
The utility model relates to the technical field of on-line analysis of chemical process, wherein the chemical process can be chemical surface treatment or a production process related to liquid chemicals, and can also be raw water, industrial wastewater and reuse water related to the production process; in particular to a pretreatment device of an on-line analyzer for a chemical process.
Background
In the process of industrial production changing from labor intensive to technology intensive, a large number of enterprises begin to use various online analytical instruments in the past decades to improve the automation degree, improve the process control capability, reduce the labor injury and the labor intensity, and replace manual long-term attendance.
Because the on-line analyzer belongs to a relatively precise instrument, some key parts, such as an electromagnetic valve, a rotary valve, a plunger pump, an injection pump and the like, can not bear large and small particle impurities or high pressure in a liquid sample due to the limitation of the technology, materials and the like, the detection result of the on-line analyzer is inaccurate, and therefore, relatively serious negative effects are brought to the process control, even production accidents and casualties are caused. On the one hand, the reason for this is that the large and small particles can cause blockage of the pipeline or internal wear of critical parts, so that the detection result is affected. The large particulate matter may be inorganic or organic, or a mixture of both. It is common experience that particles having a size of more than 50 microns may cause irreversible damage or clogging of critical components, the extent of damage varying due to the physical properties of the particles themselves. On the other hand, when the pressure of the sampling point is greater than the highest pressure value that the inlet valve body can bear, the valve body is broken, accurate sampling cannot be carried out, and therefore the accuracy of the measuring result is lost.
The pretreatment mode of the on-line analyzer in the chemical process still stays in a simpler mode at present, namely a filter is connected in series in front of the analyzer. There are some problems with this approach. Firstly, there are use and maintenance problems, namely if the filter element aperture is too small, the filter is easy to block and maintain at a high frequency, and an operator cannot find the filter block in time and maintain the filter, and if the filter element aperture is large, the filter cannot achieve the purpose, and the instrument part is worn. Second, if the sampling point pressure is high, the accuracy of the detection result is also affected. Thirdly, based on the above problems, unattended application conditions cannot be achieved, and personnel need to periodically check whether the filter element is clogged. Fourthly, when the pipeline at the sampling point has no pressure, the pretreatment pipeline cannot identify whether the online analyzer can sample or not. Fifthly, because the current pretreatment mode does not provide automatic updating of the liquid to be measured in the filter, the sampling of the online analyzer has no timeliness, i.e. the current real situation of the liquid to be measured cannot be represented. In order to compensate for the timeliness problem, the work of liquid renewal can only be completed by the on-line analyzer, and in fact most on-line analyzers do not support the function, and even if the function is supported, the renewable volume and the difference between the filter volume and the pipeline volume are large.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides an automatic on-line analysis appearance preliminary treatment scheme of one set of high reliability, the realization function includes filtering particulate matter, reduces pipeline pressure to the pressure of instrument valve body, provide the ageing, unmanned on duty of sample and report to the police at any time, high reliability self-diagnosis, back flush and the cascaded easy maintenance mode of the filter core of trading.
The technical scheme is as follows,
a pretreatment device of a chemical process on-line analyzer is characterized by comprising a controller, a liquid container to be measured, a circulating pump, a filter, a liquid inlet pressure sensor and a liquid outlet pressure sensor, wherein the filter is provided with a liquid inlet, a liquid outlet, an overflow port and a sewage discharge port, a sewage discharge valve is arranged at the sewage discharge port, an overflow valve is arranged at the overflow port, the liquid inlet pressure sensor is arranged at the top of the filter, the liquid outlet pressure sensor is arranged at the liquid outlet of the filter, a main circulating pipeline is communicated with the liquid container to be measured, the circulating pump is arranged on the main circulating pipeline, a liquid output pipeline is communicated with the main circulating pipeline, a liquid input pipeline is communicated with the liquid inlet of the filter, the liquid that awaits measuring among the liquid container that will await measuring is imported to in the filter, the filter still through return liquid pipeline with the liquid container intercommunication that awaits measuring return liquid pipeline intercommunication have with the sampling pipeline of on-line analyzer intercommunication install first ball valve on the anterior segment of liquid output pipeline, install the second ball valve on its back end install the third ball valve on the liquid input pipeline, feed liquor pressure sensor and play liquid pressure sensor all with the controller communication is connected.
As a further improvement, the starting end of the liquid return pipeline is connected to the liquid outlet, the sampling pipeline is installed at the starting end of the liquid return pipeline, the sampling pipeline is located behind the liquid outlet pressure sensor, the normally closed electromagnetic valve is installed at the front section of the liquid return pipeline, the fourth ball valve is installed at the rear section of the liquid return pipeline, and the tail end of the liquid output pipeline is connected to the liquid return pipeline through a three-way connecting piece.
As a further improvement, the starting end of the liquid return pipeline is installed on the overflow port, the overflow valve is installed at the front end of the liquid return pipeline, the pretreatment device further comprises a flow cell, a liquid outlet of the filter is connected with a first liquid return branch, the tail end of the first liquid return branch is communicated with the flow cell, the front section of the liquid return pipeline is further connected with a second liquid return branch through a three-way connection piece, the tail end of the second liquid return branch is communicated with the flow cell, the tail end of the liquid output pipeline is connected to the first liquid return branch through a three-way connection piece, the first liquid return branch is further provided with an inlet electromagnetic valve, the second liquid return branch is further provided with an outlet electromagnetic valve, and the sampling pipeline is installed on the second liquid return branch.
As a further improvement, a liquid level meter is further installed in the flow cell, and an overflow port is further formed in the top of the flow cell and used for communicating the atmosphere.
As a further improvement, the liquid level meter is a floating ball liquid level meter.
As a further improvement, the liquid level meter is an ultrasonic liquid level meter.
Advantageous effects
The beneficial effects are that: the utility model discloses reached the dual purpose of filtering particulate matter and reducing the liquid pressure that awaits measuring simultaneously, satisfied the analysis appearance to the basic demand of the liquid that awaits measuring, promote and detect precision, extension analysis appearance life-span and maintenance cycle. The requirement of unmanned on duty is satisfied, if need maintain, for example when needing back flush or change the filter core, remind in real time through the sensor. It is generally desired that the sampling point be in the recycle line, i.e. be self-pressurized. The production line condition can be pre-judged through the pressure sensor, the production line condition and the production line can work synchronously, namely, the production line has no pressure at a sampling point when not producing, and then the pretreatment can not be carried out. Sampling of liquid samples is time-sensitive, i.e. each sampling is intended to take a sample that represents the current state of the liquid to be measured. The utility model provides a pipeline liquid of preliminary treatment stage updates and circulates, then advances kind analysis again to the on-line analyzer. And closed-loop control is realized through upper computer control, and the operation reliability is improved.
Drawings
The present invention will be further described with reference to the accompanying drawings and embodiments.
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of the flow cell of the present invention.
Reference numbers in the figures:
1. liquid container 2 to be tested, circulating pump 3 and filter
301. A night inlet 302, a liquid outlet 303 and an overflow port
304. Drain 4, liquid inlet pressure sensor 5 and liquid outlet pressure sensor
6. Blowoff valve 7, overflow valve 8 and main circulation pipeline
9. Liquid output pipeline 10, liquid input pipeline 11 and liquid return pipeline
12. Sampling pipeline 13, first ball valve 14 and second ball valve
15. A third ball valve 16, a normally closed solenoid valve 17 and a fourth ball valve
18. Flow cell 1801, overflow port 19, first liquid return branch
20. A second liquid return branch 21, an inlet solenoid valve 22 and an outlet solenoid valve
23. Liquid level meter
Detailed Description
In order to further understand and appreciate the structural features and advantages of the present invention, preferred embodiments and the accompanying drawings are described in detail as follows:
as shown in fig. 1, a pretreatment device of a chemical process on-line analyzer comprises a controller, a liquid container 1 to be measured, a circulating pump 2, a filter 3, a liquid inlet pressure sensor 4 and a liquid outlet pressure sensor 5, wherein the filter 3 is provided with a liquid inlet 301, a liquid outlet 302, an overflow port 303 and a sewage outlet 304, a sewage valve 6 is arranged at the sewage outlet 304, an overflow valve 7 is arranged at the overflow port 303, the liquid inlet pressure sensor 4 is arranged at the top of the filter 3, the liquid outlet pressure sensor 5 is arranged at the liquid outlet 302 of the filter 3, a main circulating pipeline 8 is communicated with the liquid container 1 to be measured, the circulating pump 2 is arranged on the main circulating pipeline 8, a liquid output pipeline 9 is communicated with the main circulating pipeline 8, a liquid input pipeline 10 is communicated with the liquid output pipeline 9, the liquid input pipeline 10 is communicated with the liquid inlet 301 of the filter 3, the liquid to be detected in the liquid container 1 to be detected is input into the filter 3, the filter 3 is also communicated with the liquid container 1 to be detected through the liquid return pipeline 11, the liquid filtered in the filter 3 flows back into the liquid container to be detected, and the liquid to be detected is circulated in such a way so as to keep the cleanliness of the liquid to be detected. The liquid return pipeline 11 is communicated with a sampling pipeline 12 communicated with an online analyzer, and the circulating liquid is pre-detected by the online analyzer arranged at the position so as to ensure the sampling analysis result of the liquid to be detected at a detection point. The front section of the liquid output pipeline 9 is provided with a first ball valve 13 for controlling liquid output, and the liquid output pipeline 9 and the liquid in the filter 3 can be controlled to be renewed and returned to the filter 3, so that the purpose that a liquid sample obtained by a sampling pipeline 12 connected with a subsequent online analyzer has timeliness and representativeness, and chemicals are not additionally consumed is achieved. The second ball valve 14 is installed on the rear section of the liquid output pipeline, when the filter 3 is backwashed, the second ball valve 14 needs to be opened, the third ball valve 15 is installed on the liquid input pipeline 10 and used for controlling whether liquid in the liquid input pipeline is output to the filter 3, and the liquid inlet pressure sensor 4 and the liquid outlet pressure sensor 5 are in communication connection with the controller. The starting end of the liquid return pipeline 11 is connected to the liquid outlet 302, the sampling pipeline 12 is installed at the starting end of the liquid return pipeline 11 and is positioned behind the liquid outlet pressure sensor 5, the normally closed electromagnetic valve 16 is installed at the front section of the liquid return pipeline 11, the fourth ball valve 17 is installed at the rear section of the liquid return pipeline 11, and the tail end of the liquid output pipeline 9 is connected to the liquid return pipeline 11 through a three-way connecting piece.
As shown in fig. 2, a pretreatment device of a chemical process on-line analyzer comprises a controller, a liquid container 1 to be measured, a circulating pump 2, a filter 3, a liquid inlet pressure sensor 4 and a liquid outlet pressure sensor 5, wherein the filter 3 is provided with a liquid inlet 301, a liquid outlet 302, an overflow port 303 and a sewage outlet 304, a sewage valve 6 is arranged at the sewage outlet 304, an overflow valve 7 is arranged at the overflow port 303, the liquid inlet pressure sensor 4 is arranged at the top of the filter 3, the liquid outlet pressure sensor 5 is arranged at the liquid outlet 302 of the filter 3, a main circulating pipeline 8 is communicated with the liquid container 1 to be measured, the circulating pump 2 is arranged on the main circulating pipeline 8, a liquid output pipeline 9 is communicated with the main circulating pipeline 8, a liquid input pipeline 10 is communicated with the liquid output pipeline 9, the liquid input pipeline 10 is communicated with the liquid inlet 301 of the filter 3, the liquid to be detected in the liquid container 1 to be detected is input into the filter 3, the filter 3 is also communicated with the liquid container 1 to be detected through the liquid return pipeline 11, the liquid filtered in the filter 3 flows back into the liquid container to be detected, and the liquid to be detected is circulated in such a way so as to keep the cleanliness of the liquid to be detected. The liquid return pipeline 11 is communicated with a sampling pipeline 12 communicated with an online analyzer, and the circulating liquid is pre-detected by the online analyzer arranged at the position so as to ensure the sampling analysis result of the liquid to be detected at a detection point. The front section of the liquid output pipeline 9 is provided with a first ball valve 13 for controlling liquid output, and the liquid output pipeline 9 and the liquid in the filter 3 can be controlled to be renewed and returned to the filter 3, so that the purpose that a liquid sample obtained by a sampling pipeline 12 connected with a subsequent online analyzer has timeliness and representativeness, and chemicals are not additionally consumed is achieved. The second ball valve 13 is installed on the rear section of the liquid output pipeline, when the filter 3 is backwashed, the second ball valve 13 needs to be opened, the third ball valve 14 is installed on the liquid input pipeline 10 and used for controlling whether liquid in the liquid input pipeline is output to the filter 3, and the liquid inlet pressure sensor 4 and the liquid outlet pressure sensor 5 are in communication connection with the controller. The initial end of the liquid return pipeline 11 is arranged on the overflow port 303, the overflow valve 7 is arranged on the front end of the liquid return pipeline 11, the pretreatment device further comprises a flow cell 18, a liquid outlet 302 of the filter 3 is connected with a first liquid return branch 19, the tail end of the first liquid return branch 19 is communicated with the flow cell 18, liquid enters the flow cell 18 through the first liquid return branch 19, the front section of the liquid return pipeline 11 is further connected with a second liquid return branch 20 through a three-way connecting piece, the tail end of the second liquid return branch 20 is communicated with the flow cell 18, liquid returns to the return pipeline 11 through the second liquid return branch 20, the tail end of the liquid output pipeline 9 is connected to the first liquid return branch 19 through the first liquid return branch 19 during backwashing, the liquid returns to the filter 3 through the liquid output pipeline 9 through the first liquid return branch 19, the first liquid return branch 19 is further provided with an inlet electromagnetic valve 21, the second liquid return branch 20 is further provided with an outlet electromagnetic valve 22, the sampling line 12 is mounted on the second liquid return branch 20. The utility model discloses the device passes through the setting of flow-through cell, make the utility model discloses the device has the step-down function, during the step-down, keep inlet solenoid valve 21 in the closed condition, open outlet solenoid valve 22, confirm whether evacuation of the liquid in flow-through cell 18 through installation level gauge 23 on flow-through cell 18 simultaneously through the gravity flowing back, confirm behind the evacuation, open inlet solenoid valve 21 and outlet solenoid valve 22 simultaneously, confirm the pressure differential between feed liquor pressure sensor 4 and the play liquid pressure sensor 5, confirm with this whether reach the step-down purpose, whether successful filter core that can judge in the filter 3 through the step-down blocks up or not. The top of the flow cell 18 is also provided with an overflow port 1801 for venting air to ensure depressurization. The liquid level meter 23 is a floating ball liquid level meter and can also be an ultrasonic liquid level meter, and is changed according to actual use conditions.
A method for pretreating an on-line analyzer for chemical process, as shown in fig. 1, comprising the steps of:
s1, before use, the first ball valve 13, the third ball valve 15 and the overflow valve 7 need to be opened, the second ball valve 14 is closed, the filter is filled with liquid to be measured, when liquid overflow is observed at the top overflow port, the overflow valve is closed, and when the filter is used daily, the overflow valve 7 is in a normally closed state except for manual intervention maintenance;
s2, judging whether the main circulation pipeline normally runs or not through the pressure value of the liquid inlet pressure sensor 4, determining that the main circulation pipeline meets the starting condition and meets the requirement of the filtering driving force, and judging that the pressure difference between the liquid inlet pressure sensor 4 and the liquid outlet pressure sensor 5 is observed under the condition that the filtering driving force requirement is met; if the pressure difference is smaller than the preset value, the liquid to be detected filtered by the filter 3 returns to the liquid container 1 to be detected through the liquid return pipeline 11 for continuous circulation; if the pressure difference is larger than or equal to the preset value, the side can not continue to circulate, the controller control device stops running and gives an alarm, and the normally closed electromagnetic valve 16 is opened to reduce the pressure. After the pressure is reduced, the pressure difference between the liquid inlet pressure sensor 4 and the liquid outlet pressure sensor 5 is confirmed again, and whether the filter element of the filter 3 is blocked or not is judged;
s3, if the filter element of the filter 3 is blocked, manual back washing is needed: closing the third ball valve 15, opening the second ball valve 14 and the normally closed solenoid valve 16, allowing the liquid in the liquid container to be detected to enter the liquid return pipeline 11 through the liquid output pipeline, allowing the liquid to enter the filter 3 from the liquid return pipeline 11 for back washing, and finally opening the blow-down valve 6 to discharge the waste liquid from the blow-down port;
and S4, after the waste liquid is emptied, closing the blowdown valve 6 and the second ball valve 14, opening the third ball valve 15 to continue liquid circulation in the device, and during sampling, closing the normally closed electromagnetic valve 16, and sampling by the online analyzer from the sampling pipeline for analysis.
A method for pretreating an on-line analyzer for chemical process, as shown in fig. 2, comprising the steps of:
s1, before use, the first ball valve 13, the third ball valve 15 and the overflow valve 7 need to be opened, the second ball valve 14 is closed, the filter 3 is filled with liquid to be measured, when liquid overflow at the top overflow port 303 is observed, the overflow valve 7 is closed, and during daily use, except for manual intervention maintenance, the overflow valve 7 is in a normally closed state;
s2, judging whether the main circulation pipeline normally runs or not through the pressure value of the liquid inlet pressure sensor 4, determining that the main circulation pipeline meets the starting condition and meets the requirement of the filtering driving force, and judging that the pressure difference between the liquid inlet pressure sensor and the liquid outlet pressure sensor is observed under the condition that the filtering driving force requirement is met; if the pressure difference is smaller than the preset value, the liquid to be detected filtered by the filter 3 returns to the liquid container 3 to be detected through the liquid return pipeline 11 for continuous circulation; if the pressure difference is greater than or equal to the preset value, the side can not continue to circulate, and the controller control device stops running and gives an alarm;
s3, keeping the inlet electromagnetic valve 21 in a closed state, opening the outlet electromagnetic valve 22, draining liquid in the flow cell 18 through gravity drainage, opening the inlet electromagnetic valve 21 and the outlet electromagnetic valve 22 after checking and confirming that the liquid in the flow cell 18 is drained, and confirming the pressure difference between the liquid inlet pressure sensor 4 and the liquid outlet pressure sensor 5, so as to judge whether pressure reduction is successful;
s4, if the pressure reduction is unsuccessful, the filter element in the filter 3 is blocked, and the filter needs to be cleaned by manual intervention and backwashing: closing the third ball valve 15, opening the second ball valve 14, allowing the liquid in the liquid container 3 to be tested to enter the first liquid return branch 19 through the liquid output pipeline, allowing the liquid to enter the filter 3 from the first liquid return branch 19 for backwashing, and finally opening the blow-down valve 6 to discharge waste liquid from the blow-down port;
and S5, after the waste liquid is emptied, closing the blowdown valve 6 and the second ball valve 14, opening the third ball valve 15 to continue liquid circulation in the device, and during sampling, closing the outlet electromagnetic valve 22 and sampling the online analyzer from the sampling pipeline for analysis.
In summary, the present invention is only a preferred embodiment, and is not intended to limit the scope of the present invention, and all equivalent changes and modifications of the shapes, structures, features and spirit described in the claims of the present invention should be included in the scope of the present invention.
Claims (6)
1. A pretreatment device of a chemical process on-line analyzer is characterized by comprising a controller, a liquid container to be measured, a circulating pump, a filter, a liquid inlet pressure sensor and a liquid outlet pressure sensor, wherein the filter is provided with a liquid inlet, a liquid outlet, an overflow port and a sewage discharge port, a sewage discharge valve is arranged at the sewage discharge port, an overflow valve is arranged at the overflow port, the liquid inlet pressure sensor is arranged at the top of the filter, the liquid outlet pressure sensor is arranged at the liquid outlet of the filter, a main circulating pipeline is communicated with the liquid container to be measured, the circulating pump is arranged on the main circulating pipeline, a liquid output pipeline is communicated with the main circulating pipeline, a liquid input pipeline is communicated with the liquid inlet of the filter, the liquid that awaits measuring among the liquid container that will await measuring is imported to in the filter, the filter still through return liquid pipeline with the liquid container intercommunication that awaits measuring return liquid pipeline intercommunication have with the sampling pipeline of on-line analyzer intercommunication install first ball valve on the anterior segment of liquid output pipeline, install the second ball valve on its back end install the third ball valve on the liquid input pipeline, feed liquor pressure sensor and play liquid pressure sensor all with the controller communication is connected.
2. The pretreatment device of a chemical process on-line analyzer according to claim 1, wherein the starting end of the liquid return line is connected to the liquid outlet, the sampling line is installed at the starting end of the liquid return line, the sampling line is located behind the liquid outlet pressure sensor, a normally closed solenoid valve is installed at the front section of the liquid return line, a fourth ball valve is installed at the rear section of the liquid return line, and the tail end of the liquid output line is connected to the liquid return line through a three-way connection.
3. The pretreatment device of a chemical process on-line analyzer according to claim 1, it is characterized in that the initial end of the liquid return pipeline is arranged on the overflow port, the overflow valve is arranged on the front end of the liquid return pipeline, the pretreatment device also comprises a flow cell, a first liquid return branch is connected to the liquid outlet of the filter, the tail end of the first liquid return branch is communicated with the flow cell, the front section of the liquid return pipeline is also connected with a second liquid return branch through a three-way connecting piece, the tail end of the second liquid return branch is communicated with the flow cell, the tail end of the liquid output pipeline is connected to the first liquid return branch pipeline through a three-way connecting piece, an inlet electromagnetic valve is further installed on the first liquid return branch, an outlet electromagnetic valve is further installed on the second liquid return branch, and the sampling pipeline is installed on the second liquid return branch.
4. The pretreatment device of claim 3, wherein a liquid level meter is further installed in the flow cell, and the top of the flow cell is further provided with an overflow port for venting air.
5. The pre-processing apparatus of the on-line analyzer for chemical process as claimed in claim 4, wherein the level meter is a float level meter.
6. The pre-processing apparatus of the on-line analyzer for chemical process according to claim 4, wherein the liquid level meter is an ultrasonic liquid level meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023103407.7U CN214121768U (en) | 2020-12-22 | 2020-12-22 | Pretreatment device of chemical process on-line analyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023103407.7U CN214121768U (en) | 2020-12-22 | 2020-12-22 | Pretreatment device of chemical process on-line analyzer |
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| Publication Number | Publication Date |
|---|---|
| CN214121768U true CN214121768U (en) | 2021-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023103407.7U Active CN214121768U (en) | 2020-12-22 | 2020-12-22 | Pretreatment device of chemical process on-line analyzer |
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| CN (1) | CN214121768U (en) |
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- 2020-12-22 CN CN202023103407.7U patent/CN214121768U/en active Active
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Address after: 201422 room 71, building 11, 171 Wusi Branch Road, Haiwan Town, Fengxian District, Shanghai Patentee after: Jitao Automation Technology (Shanghai) Co.,Ltd. Address before: 201422 room 71, building 11, 171 Wusi Branch Road, Haiwan Town, Fengxian District, Shanghai Patentee before: Shanghai Jitao Automation Technology Co.,Ltd. |
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